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Stamping processing is the production technology of product parts with certain shape, size and performance by means of the power of conventional or special stamping equipment, so that the sheet metal in the die is directly subjected to the deformation force and deformation. Sheet metal, mould and equipment are the three elements of stamping. Stamping is a cold metal deformation machining method. Therefore, it is called cold stamping or sheet metal stamping, referred to as stamping. It is one of the main methods of metal plastic machining (or pressure machining) and also belongs to material forming engineering technology. Compound stamping The compound stamping involved in this paper does not refer to the compound of blanking, drawing, punching and other stamping processes, but the compound of stamping process and other processing processes, such as the compound of stamping and electromagnetic forming, the combination of stamping and cold forging, the compound of stamping and mechanical processing and so on. Composite process of stamping and electromagnetic forming Electromagnetic forming is high speed forming, and high speed forming can not only extend the forming range of aluminum alloy, but also improve its forming performance. With the method of the compound stamping forming aluminum alloy cover the specific method is: use a set of convex concave die in aluminum alloy cover Angle and difficult forming contour in mount solenoid, electromagnetic method for forming, and then with a pair of mould in press forming covering parts forming part of the easily, and then to preform a high-speed deformation using electromagnetic coil to finish the final shape. It has been proved that the aluminum alloy coating which is difficult to be obtained by a single stamping method can be obtained by this compound forming method. The latest research shows that magnesium alloy is a kind of metal with high specific strength, good rigidity and strong electromagnetic interface protection performance. Its application prospect in electronics, automobile and other industries is very promising, and it has a tendency to replace traditional ferroalloy, aluminum alloy and even plastic material. At present, magnesium alloy parts used in automobile include instrument bottom plate, seat frame, engine cover, etc., and magnesium alloy tube parts are also widely used in aircraft, missiles, spaceships and other cutting-edge industrial fields. However, the dense hexagonal lattice structure of magnesium alloy determines that it cannot be formed in normal temperature. At present, a kind of die which combines heating and forming has been developed to press magnesium alloy products. The forming process of the product is as follows: in the falling process of the press slider, the upper die and the lower die are clamped to heat the material, and then the product is formed in the appropriate motion mode. This method is also applicable to the joint of forming products and the compound forming of various products in the press. Many refractory materials, such as magnesium alloys and titanium alloys, can be formed by this method. Due to the stamping requirement punch block has the function of pause in the process of decline to provide time for material heating, so the people working on a new concept of punch - type servo motor punch press, CNC crankshaft using the punch can be realized in the stamping die also includes tapping screw, rivet, composite processing, thus effectively expand the scope of stamping processing, for magnesium alloys are widely used in plastic processing industry laid a solid foundation. [1] Combination of stamping and cold forging In general, sheet metal stamping can only form the parts with the same wall thickness. However, in the production of automobile parts, some parts with thin walls but different thickness are often encountered. It is very easy to form them by the compound plastic forming method that combines stamping with cold forging. Therefore, the processing range of sheet metal can be extended by combining stamping with cold forging. The method is preforming by stamping and then forming by cold forging. The advantages of cold stamping forming are as follows: first, raw materials are easy to be purchased cheaply, which can reduce the production cost; The second is to reduce the single cold forging required by the large forming force, is conducive to improve the life of the mold. Micro stamping Now the micro machining refers to the micro parts processing technology. The definition of a micro part usually means that the size of at least one direction is less than 100 m, which has an unparalleled application prospect compared with conventional manufacturing technology. Made with the technology of micro robot, the micro plane, miniature satellites, satellite gyroscope, micro pump, micro instruments and meters, miniature sensors, integrated circuit and so on, many lead in the modern science and technology have good application, he can bring new development and breakthrough, to many areas will no doubt on the future of our country and had a profound influence on national defense science and technology, the world is incalculable role in promoting the development of science and technology. For example, micro-robot can complete complex operations such as optical fiber leads, adhesion and butt joint, as well as the detection of tiny pipes and circuits, as well as the production and assembly of integrated chips. It is not difficult to see the attractive charm of micro-machining. Developed industrial countries attach great importance to the research and development of micro-processing and have invested a lot of manpower, material resources and financial resources. Some famous universities and companies with foresight have also joined this group. China has also done a lot of research work in this regard, and it is reasonable to believe that in the 21st century, micro-processing will bring great changes and profound impacts to the whole world, just like micro-electronics technology. For the die industry, due to the miniaturization of stamping parts and the continuous improvement of precision requirements, the die technology has put forward higher requirements. The reason is that micro parts than traditional parts forming is much more difficult, the reason is: (1) the smaller the parts, the surface area and volume ratio increase rapidly; (2) the workpiece and tool adhesion, surface tension and other significant increase; (3) the impact of grain size is significant, is no longer isotropic uniform continuum; (4) the workpiece surface storage lubricant is relatively difficult. One of the important aspects of micro stamping is punching small holes. For example, there are many small holes which need to be punched in micro machinery and micro instruments. So it is very important to research on small hole stamping. The research of punching holes focuses on: one is how to reduce the size of punch; The second is how to increase the strength and stiffness of the micro punch (in this aspect, in addition to the materials and processing technology involved, the most commonly used is to increase the guide and protection of the micro punch). Although there are still many problems to be studied in punching holes, many gratifying achievements have been made. Some data show that foreign developed micro-stamping machine is 111mm long, 62mm wide, 170mm high, equipped with an ac servo motor, which can produce 3kN of pressure. The machine is equipped with a continuous stamping die, which can achieve blanking and bending. The university of Tokyo in Japan has made a micro stamping punch and die using a WFDG technology. The die can be used for micro stamping. Non-circular microholes with a width of 40 m can be punched out on a polyamide plastic sheet with a thickness of 50 m. Tsinghua university has made a good start in drawing ultra-thin metal cylindrical parts. The key of ultra-thin wall drawing technology is the high precision forming machine. They developed a microcomputer controlled precision forming testing machine in the forming of ultra-thin-walled metal cylinder with the wall thickness of 0.001mm ~ 0.1mm, so that the precision of punch and die can reach 1m in the process of machining, effectively solving the problem that the ultra-thin-walled drawing is prone to wrinkle and fracture and cannot be operated normally. This machine is used for a series of thinning and deep processing of brass and pure aluminum with initial wall thickness of 0.3mm, and a series of ultra-thin-walled metal cylinders with inner diameter of 16mm, wall thickness of 0.015mm ~ 0.08mm and length of 30mm are processed. It is found that the thickness difference of the ultra-thin wall cylinder is less than 2 m and the surface roughness is Ra0.057 m, which greatly improves the precision of the ultra-thin wall cylinder and the performance of the machine. Intelligent stamping Sheet metal stamping from manual operation to semi-mechanization, mechanization, automation, are stamping development to each stage of the symbol, and now the sheet metal stamping has entered the intelligent stage, therefore, it can be said that intelligent stamping is the inevitable trend of sheet metal stamping technology development. The research on sheet metal forming intellectualization originated from the United States in the early 1980s. During the first ten years of the research on this technology, all the efforts were focused on the forming control of bending and springback. It was not until 1990 that the research on this technology was extended to the drawing deformation of cylindrical parts, and then to the automobile covering parts forming and progressive die intelligent forming. The so - called intelligent stamping is a comprehensive technology that combines cybernetics, information theory, mathematical logic, optimization theory, computer science and sheet metal forming theory. Sheet metal intellectualization is a higher stage of new technologies such as stamping process automation and flexible machining system. Its amazing is that according to the characteristics of the processed object, using easy to monitor the physical quantity, online identify material performance parameters and predict the optimal process parameters, and automatically complete the sheet metal stamping with the optimal process parameters. This is a typical intelligent control of sheet metal forming four elements: real-time monitoring, online identification, online prediction, real-time control processing. In a sense, intelligent stamping is actually a revolution in people's understanding of the nature of stamping. It eschews the endless search for stamping principles of the past and instead mimics the human brain to process what actually happens in stamping. Instead of starting from basic principles, it takes facts and data as the basis to realize optimal control of the process. Of course, the intelligent control is the optimal process parameters, so the determination of the optimal process parameters is the key to the intelligent control. The so-called optimal process parameters are the most reasonable process parameters that can be adopted under the premise of satisfying various critical conditions. In order to realize on-line prediction of optimal process parameters, it is necessary to have a clear understanding of various critical conditions of the forming process, and be able to give a quantitative and accurate description, on this basis, the intelligent control can be determined. The accuracy of quantitative description determines the recognition and prediction accuracy of the intelligent system. This indicates that the recognition accuracy, prediction accuracy and control accuracy of the system all depend on the improvement of quantitative description accuracy, so it needs to be modified and improved continuously. In addition, the detection accuracy, identification accuracy, prediction accuracy and monitoring accuracy system itself should be constantly improved. In this way, the intelligent stamping can reach the due level. The research shows that in the intelligent control of the drawing process, the prediction of the optimal process parameters is finally reduced to the determination of the change rule of the blank holder force, and the control of the blank holder force is based on the prediction of the blank holder force. There are two traditional methods to predict the blank holding force in deep drawing: experimental method and theoretical calculation method. In recent years, artificial neural network and fuzzy theory and other artificial intelligence theories have been introduced into the prediction research of the optimal control curve of blank holder force. And the theoretical basis of the change rule of blank holder force is to determine the critical condition of wrinkling or cracking. Further research also shows that for conical parts, the flange wrinkling area is almost surrounded by the side wall wrinkling area, so it overcomes the side wall wrinkling and also overcomes the flange wrinkling, so for conical parts, the main contradiction is focused on the workpiece fracture and side wall wrinkling. Therefore, the size of the blank holder force should be controlled between the minimum limit of wrinkle-free side wall and the maximum limit of non-breaking side wall. [2] Green stamping Green manufacturing is a modern manufacturing mode that takes environmental impact and resource efficiency into consideration comprehensively, so is green stamping, which is actually the concrete embodiment of human sustainable development strategy in modern stamping. It should include in the mold design, the manufacture, the maintenance and the production application and so on each aspect. 1. Green design the so-called green design is in the mold design stage will be environmental protection and reduce resource consumption and other measures into the product design, disassembly, recyclability, manufacturability as design objectives and parallel consideration and ensure product function, quality life and economy. With the development of die industry, the requirements of sheet metal forming quality and die design efficiency are higher and higher. In recent years, the numerical simulation of sheet metal forming process by finite element method is a revolution in the field of die design. The displacement, stress and strain distribution of workpiece can be obtained by computer numerical simulation. The possible wrinkling can be predicted by observing the deformation shape of the workpiece after displacement. Based on the position of the main strain value at the discrete point on the limit curve of sheet metal forming or by using damage mechanics model, the possible fracture in the forming process can be predicted. The shape of the workpiece and the distribution of residual stress can be obtained by simulating the springback process when the binding force on the workpiece is removed. All these provide a scientific basis for the optimization of stamping process and mold design, which is the real green mold design. Green manufacturing in the mold manufacturing, should use green manufacturing. There is now a laser remanufacturing technology, which is based on the appropriate alloy powder as the material, with the support of CAD/CAM software parts prototype, using a computer controlled laser head repair mold. Specific process is when the feeding machine and machine tool according to the specified space trajectory, a beam of light radiation and powder conveying synchronous, make the repair parts deposition step by step, the last generation and approximate three-dimensional prototype parts, and its performance can be achieved even more than the original base material level, this approach in stamping die repair, especially the most versatile in the dies for covering parts repair. The technology is called green manufacturing because it does not target the consumption of large amounts of natural resources. In addition, in the stamping production should minimize the stamping process waste and structural waste, maximum use of materials and minimum waste. To reduce process waste, it is to solve the problem by optimizing the layout, such as using the method of pair layout, cross layout, etc., can also use the method of less waste layout, in order to greatly improve the material utilization rate. The so-called optimal layout is to solve two problems: one is how to express it into a mathematical model; The second is how to find the optimal solution as soon as possible according to the mathematical model. Modern optimization technology has developed into intelligent optimization algorithm, including artificial neural network, genetic algorithm, simulated annealing, tabu search, etc. It can be believed that there will be a breakthrough in the optimization of the layout, the structure of the workpiece waste can be used for the workpiece nesting method, so as to achieve the use of waste, waste into treasure. In addition, it is not completely impossible to solve the problem by changing the product structure. For the suits, everyone knows that there is a big gasket in a suit of gasket, gasket and then set the small gasket, etc..

Standard parts refer to the zero (part) parts, such as threaded parts, keys, pins, rolling bearings and so on, which have been completely standardized in structure, size, drawing, marking and other aspects and are commonly used by professional factories. In a broad sense, it includes standardized fasteners, connectors, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. Narrow sense includes standard fastener only. Domestic commonly known as standard parts is the abbreviation of standard fastener, is a narrow concept, but can not exclude the existence of a broad concept,. In addition, there are industry standard parts, such as automotive standard parts, mold standard parts, etc., also belong to the broad standard parts Non-standard parts are mainly parts that the state has not set up strict standard specifications, and other parts that are controlled by the enterprise freely without relevant parameters. There are many kinds of non-standard parts, there is no very standard classification. The general classification is as follows: Non-standard metal parts: The customer provides the drawing, the manufacturer USES the equipment to make the corresponding product according to the drawing, usually is the mold majority, the tolerance request, the smoothness is the customer stipulation, does not have the certain pattern. Products from casting to finishing completely need corresponding quality control, the process is complex and variable, the general cost is higher than the standard parts. Non-metallic non-standard parts: It is the processing of some nonmetallic materials. Such as plastic, wood, stone, etc., in recent years, the injection molding industry, the development of plastic mold is increasingly sophisticated, curved surface design, programming CNC reference, so that the cost of non-standard processing and tolerance level have been greatly improved.

CNC machine tool processing and traditional machine tool processing process procedures are generally consistent, but there have been significant changes. A machining method that USES digital information to control the displacement of parts and tools. It is an effective way to solve the problems of variable variety, small batch, complex shape and high precision of parts and realize high efficiency and automatic machining. CNC machine tools at the beginning of the selection of aircraft parts with complex surface processing objects, to solve the common processing methods are difficult to solve the key. The biggest characteristic of nc machining is to use perforated tape (or tape) to control the machine tool for automatic machining. Because aircraft, rocket and engine parts have different characteristics: aircraft and rocket zero, component size, complex surface; Engine zero, small component size, high precision. Therefore, the aircraft, rocket manufacturing departments and engine manufacturing departments of the choice of CNC machine tools are different. In the aircraft and rocket manufacturing to use continuous control of large CNC milling machine, and in the engine manufacturing both use continuous control of CNC machine tools, but also use point control of CNC machine tools (such as CNC drilling machine, CNC boring machine, machining center, etc.). CNC machining has the following advantages: (1) reduce the number of tooling, machining complex shape parts do not need complex tooling. If you want to change the shape and size of parts, you only need to modify the parts processing procedures, which are applicable to the development and modification of new products. (2) stable processing quality, high machining precision, high repeat precision, suitable for aircraft processing requirements. (3) variety, small batch production of high production efficiency, can reduce the production preparation, machine tool adjustment and process inspection time, and because of the use of the best cutting quantity and reduce the cutting time. (4) can be processed conventional methods are difficult to process complex surface, and can even process some parts of the processing can not observe. The disadvantage of numerical control machining is that the machine tool equipment is expensive and requires maintenance personnel to have a high level.

Dongguan Longwang Hardware Co. Ltd., specializing in non-standard precision hardware parts processing, with general taxpayer qualifications, ISO product protection system. At the beginning of the establishment of our Division in the high starting point, technology and innovation combined purpose; High-quality, high-tech, high-efficiency three high management concept, high-quality products and all-round services to customers to achieve win-win. Our company now has various types of imported processing equipment, such as multi-axis processing centers, multi-axis multi-power CNC computers with more than 280 units, computer core walking, knife lathes 46 units, high-precision pneumatic continuous punching machines 14 units, injection molding machines 20 units, It also has its own oxidation, electroplating, and die-casting factories. It can achieve integrated processing of product sales, milling, composite milling, stamping, injection molding, anodizing, electroplating and other processes, and is equipped with multiple series of automated secondary processing equipment. High precision and high efficiency to complete the automated production and processing of large quantities of products, the company is also equipped with a large number of high-precision detection equipment, optical projector, second dimensional microscope, third dimension, concentric tester. .. .. .. .. .. Since its establishment in 2008, our company has provided high-tech, sophisticated and sophisticated non-standard hardware parts for major industries, such as high-precision electronic product structures, fashionable digital products such as computers and mobile phones, smart home structures, and automotive and aircraft machinery accessories., Instrument and instrument micro accessories, central control arm components, medical equipment micro hardware, office equipment accessories.

Folding program structure Program segment is a continuous group of words that can be processed as a unit. The main part of a part processing program consists of several program segments. Most program segments are used to instruct a machine tool to complete or perform an action. Program segment is composed of size word, non - size word and program segment end instruction. When writing and printing, each segment typically occupies one line, as does when displaying a program on the screen. Folding program format A conventional processing program consists of a start character (a single-column segment), a program name (a single-column segment), a program body, and a program end instruction (generally a single-column segment). There is also a program terminator at the end of the program. The program start and end characters are the same: % in ISO code, ER in EIA code. End of program instructions can be M02(end of program) or M30 (end of tape). Today's CNC machine tools are generally used to run a stored program, M02 and M30 at this point in common is: after completing all other instructions in the program segment, to stop the spindle, coolant and feed, and make the control system reset. M02 and M30 are completely equivalent when used on some machine tools (systems), while there are the following differences when used on other machine tools (systems) : when ending the program with M02, the cursor stops at the end of the program after the automatic operation; When M3O is used to end the program running, the cursor and the screen display can automatically return to the beginning of the program after the automatic running. Once the startup button is pressed, the program can be run again. Although M02 and M30 allow you to share a segment with other program words, it is best to list it as a single segment, or to share only a segment with sequence Numbers. The program name, which precedes the program body and follows the program initializer, typically has a single line. There are two forms of program name: one is the specified English word (O), followed by a number of digits composition. The maximum number of digits allowed for a number is specified by the specification, usually two digits and four digits. This form of program name can also be called a program number. In another form, a program name is made up of English words, Numbers, or a mixture of English and Numbers, with a minus sign in the middle. This form allows users to name the program more flexible, such as in the LC30 CNC lathe parts drawing no. 215 flange the third process of the program, can be named lc30-fiange-215-3, which brings great convenience to the use, storage and retrieval. The form of the program name is determined by the numerical control system. % O1001 N0, G92, X0, Y0, Z0 N5 G91 G00 X50 Y35 S500 MO3 N10 G43 Z - 25 T01.01 N15 G01 G007 Z - 12 N20 G00 Z12 N25 X40 N30 G01 Z - 17 N35 G00 G44 Z42 M05 N40 G90 X0 Y0 N45 (are % Collapse the segment format Rules for the arrangement of words, characters, and data in a segment are called block formats. Numerical control has historically used fixed sequential format and delimiter (HT or TAB) program segment format. These two kinds of program segment format has passed, at present at home and abroad are widely used word address variable program segment format, also known as word address format. In this format, the program word length is not fixed, the number of program words is variable, the vast majority of CNC systems allow the program word order is arbitrary arrangement, so it belongs to the variable program segment format. However, in most cases, for the convenience of writing, typing, checking and proofreading, program words are arranged in a certain order in program segments. Numerical control machine programming instructions with a detailed format to classify the details of programming: programming characters, program segments in the sequence and word length of the program. Such as: / NO3 G02 X+053 Y+053 I0 J+053 F031 S04 T04 M03 LF The detailed format classification of the above example is as follows: N03 is the sequence number of the program segment; G02 indicates that the machining track is clockwise arc; X+053, Y+053 represent the endpoint coordinates of the processed arc; I0 and J+053 represent the center coordinates of the processed arc; F031 is the processing feed speed; S04 is the spindle speed; T04 is the tool number of the tool used; M03 is the auxiliary function instruction; LF segment end instruction; / select the command for the skip. The function of skip step selection instruction is: under the premise that the program remains unchanged, the operator can choose to execute or not execute the program segment with skip step selection instruction in the program. The method of selection, usually through the operation panel of the jump selection switch to switch ON or OFF, to achieve the implementation of no execution or execution of the "/" segment. Fold the main program and subroutine Programming a process sometimes involves a set of program segments appearing multiple times in a program, or using it in several programs. We can extract this set of program segments and store them separately after naming. This set of program segments is a subroutine. Subroutine is a section of machining program which can be called by the appropriate machine tool control instruction. The processor in which the instructions to invoke the first layer subroutine reside is called the main program. The instruction of the tone program is also a program segment, which generally consists of subroutine call instructions, subroutine name and call times, etc., the specific rules and format vary with the system, for example, the same is "call 55 subroutine once", FANUC system USES "M98 P55". ", while the American a-b company system USES "P55x". Subroutines can be nested, that is, layer after layer. The relationship between the upper and lower levels is the same as that between the main program and the first level subroutine. The maximum number of layers can be set, determined by the specific numerical control system. The form and composition of the subroutine are roughly the same as the main program: the first line is the subroutine number (name), and the last line is the "end of the subroutine" instruction, and between them are the subroutine bodies. However, the main program end instruction function is to end the main program, let the CNC system reset, its instructions have been standardized, all systems are using M02 or M30; And the function of subroutine termination instruction is to end the subroutine, return to the main program or the upper level subroutine, the instructions of the various systems are not unified, such as FANUC system with M99, Siemens system with M17, the United States a-b company's system with M02 and so on. User macros can be used in nc machining programs. The so-called macro program is a subroutine containing variables, in the program call macro program instructions called user macro instructions, the system can use the function of the user macro program called user macro function. The user macro function can be executed simply by writing out the user macro command. The biggest features of user macros are: Variable can be used in user macros; - you can use algorithms, steering statements and a variety of functions The user macro command can be used to assign variables. Numerical control machine tool adopts group technology to process parts, which can enlarge batch, reduce programming quantity and improve economic benefit. In group processing, parts are classified and a processing program is prepared for this kind of parts, instead of a program for each part. In processing the same kind of parts is only the size is not the same, the main convenience of using user macro is that you can use variables instead of specific values, to the actual processing, only the actual size of this part with the user macro command and variable can be assigned. folding

Ordinary lathe Wide processing objects, spindle speed and feed adjustment range, can process the internal and external surface of the workpiece, end face and internal and external threads. This kind of lathe is mainly operated manually by workers with low production efficiency and is suitable for single piece, small batch production and repair workshop. Turret and rotary lathe It has a turret tool holder or a return wheel tool holder that can hold more than one tool. It can be used by workers to complete various processes successively in one clamping process of workpiece. It is suitable for batch production. Automatic lathe According to certain procedures to automatically complete the multi-process processing of small and medium-sized workpiece, can automatically load and unload, repeat processing a batch of the same workpiece, suitable for a large number of, a large number of production. Multi-tool semi-automatic lathe There are single axis, multi - axis, horizontal and vertical. The uniaxial horizontal layout is similar to that of an ordinary lathe, but the two sets of tool holders are mounted on the front and back or up and down of the spindle, respectively, for the processing of disk, ring and shaft workpieces, the productivity of which is 3 ~ 5 times higher than that of an ordinary lathe. Copying lathe Can imitate the shape size of the template or sample, automatic completion of the workpiece processing cycle (see copying machine tool), suitable for small batch and batch production of workpiece with complex shape, the productivity is 10 ~ 15 times higher than the general lathe. There are multi - tool holder, multi - axis, chuck - type, vertical and other types. Vertical lathe The spindle is perpendicular to the horizontal plane, the workpiece is clamped on the horizontal rotary table, and the tool holder moves on the beam or column. Suitable for machining larger, heavier, difficult to install in the general lathe workpiece, divided into two categories of single column and double column. Relieving lathe At the same time of turning, the tool holder periodically makes radial reciprocating movement, which is used for forklift milling cutter, hob and other forming tooth surface. A small grinding wheel driven by a separate motor, usually with a grinding attachment, is used to grind the tooth surface. Specialized lathe A lathe that processes a particular surface of a work piece, such as a crankshaft lathe, camshaft lathe, wheel lathe, axle lathe, roll lathe, and ingot lathe. Combined lathe It is mainly used for turning, but can also be boring, milling, drilling, inserting, grinding and other processing after adding some special parts and accessories, with the characteristics of "one machine and many functions", it is suitable for the repair work of engineering vehicles, ships or mobile repair stations. Saddle lathe Saddle lathe in the headbox at the left end of the bed is sunken, can accommodate large diameter parts. Lathe shape for both ends of the high, low in the middle, like a saddle, so called saddle lathe. Saddle lathe is suitable for processing large radial size, small axial size parts, suitable for turning the workpiece of the outer circle, inner hole, end face, groove and metric system, inch system, module, after the pitch thread, but also for drilling, boring, reaming and other processes, especially suitable for single, batch production enterprises. Saddle lathe can process larger diameter workpiece in saddle groove. The guide rail of the machine tool is hardened and refined to make it easy and reliable to operate. The lathe has the characteristics of high power, high speed, strong rigidity, high precision and low noise.

There are many kinds of CNC lathes, vertical CNC milling machines, horizontal CNC milling machines, and machining centers CNC processing center system: divided into OKUMA system and FANUC system, mitsubishi system, heidhan, rhodes, etc The characteristics Compared with ordinary machine tools, nc machine tools have the following characteristics: advantages 1.Processing precision of high processing quality; 2.Can be multi-coordinate linkage, can process the shape of complex parts; 3.When parts of processing are changed, the nc program is usually changed to save production preparation time. 4.Machine itself has high precision and rigidity, can choose favorable processing dosage and high productivity (generally 3~5 times of ordinary machine). 5.Machine automation degree high, can reduce labor intensity; 6.Mass production, product quality easy to control; disadvantages 1.Has high technical requirements for operators and maintenance personnel. 2.But its processing line is not easy to control, as ordinary machine as intuitive. 3.Its maintenance inconvenience, high technical requirements; 4.Process is not easy to control.

Modern manufacturing industry has put forward more and more requirements for NC equipment, which requires equipment to achieve high speed, high efficiency, high precision and complex parts processing. As a modern equipment for machining complex parts, five-axis CNC machine tools have been more and more widely used. During the development and application of five-axis NC machine tools, a series of key technical problems need to be solved, among which the most important is how to realize the programming of five-axis NC machine tools. At present, the programming of five-axis NC machining mostly adopts computer automatic programming, and the post-processing technology is the most critical technology in automatic programming. Because of the diversity of the structure of five-axis CNC machine tools, it is very difficult to develop the post-processor of five-axis CNC machine tools, especially the post-processor considering the function of spatial position compensation. If the post-processing problem is not solved properly, the light processing equipment can not give full play to its advantages in function and processing efficiency, resulting in small use of large materials, and serious production accidents. In this paper, a five-axis NC machining center with two turntables installed on the worktable of a three-axis vertical machining center is studied. The programming of NC machining program for complex parts and the development of special post-processor are studied. The main research contents of this paper are as follows: (1) Based on the research of the structure and CNC system of five-axis CNC machine tool and the post-processing algorithm of five-axis CNC machine tool, a special post-processor for five-axis CNC machine tool with double turntable is developed under the VB development environment. (2) use UG software to work out the impeller machining plan and generate the tool path of impeller machining. The NC machining program of impeller is generated by the special post processor and the post processor of the five-axis NC machine tool generated by UG / Post, and the correctness of the special post processor is verified by comparing the NC machining program generated by them. (3) Using the VERICUT NC machining simulation software to model the five-axis NC machine tool with double turntable, and the machining process of the impeller is simulated to verify the correctness of the machining program. (4) The theoretical deduction and the usability of the special post-processor are verified by machining the typical impeller on a five-axis NC machine tool. The research of this paper has a certain practical significance on how to develop the post-processor of five-axis NC machine tools and solve the problems related to the post-processing of five-axis NC machine tools.

First, preparation before the repair The structure and working principle of the CNC five-axis linkage CNC machining center rotary table (Fig. 1.2.60) are as follows: The CNC rotary table is mainly used for CNC boring and milling machines. Its shape is almost the same as that of the universal table, but its drive is The driving method of the servo system. It can be linked to other servo feed axes. Its feed, indexing and positioning lock are controlled by the given commands. When the 5-axis linkage CNC machining center performs the indexing movement on the ratchet-type indexing table (ie, the rotary table), its working process is divided into three steps: 1. The indexing table is lifted. 2. Worktable rotary indexing. 3. Indexing table is lowered and positioned and clamped Second, pre-research investigation After the five-axis CNC machining center is turned on, there will be no emergency stop alarm, and the X, Y, and Z axes will be normal when returning to zero. When the B axis is zero, the alarm No. 2005 displayed on the LED of the machine system can be known. The AC contactor that controls the B-axis servo drive system is normally sucked. Third, according to the analysis of the image, the cause of the list According to the fault phenomenon, it can be inferred that the phenomenon of causing the five-axis linkage CNC machining center has the following points: 1. In the ladder diagram of the system, the work clamp clamping switch is in the wrong state, so that the worktable is still in the clamped state. 2. The B-axis drive motor burns out or the motor power line is broken. 3. B-axis bearing parts burn out. 4. The oil in the hydraulic tank is insufficient. 5. The hydraulic pump does not work or the hydraulic oil circuit has a broken circuit. 6. The hydraulic cylinder leaks. Fourth, determine the relevant steps to troubleshoot. According to the five-axis linkage CNC machining center machine maintenance guidelines and the above reasons, the troubleshooting steps are developed. 1. First check the status of the table clamp switch, 138.0 is "1" normal. When the table is manually released, 13.8.0 changes from "1" to "0", indicating that the table can be released. 2. Check that the oil in the hydraulic tank is in the normal range. 3. Check the oil pump to the oil circuit in the rotary table, there is no oil leakage. 4. After repeated tests, it was found that there is a problem with the hydraulic pressure of the five-axis CNC machining center table. The normal working pressure is 4.0~4.5MPa. When the workbench is loosened and lifted, the hydraulic pressure drops from 4.0MPA to about 2.5MPA. The pressure relief is severe, causing the workbench not to be fully lifted. After the release delay, the rotation cannot be performed, resulting in overload. After dismantling work, disintegration inspection found that the O-ring of the piston support ring has linear wear, its state can pass the pressure oil, the inner wall of the hydraulic cylinder is rough, the annular knife pattern is obvious, and the precision is too bad. After replacing the hydraulic cylinder sleeve and the sealing ring, after re-installing and adjusting the test vehicle, the five-axis linkage CNC machining center runs normally and the fault is eliminated.

The machining center is often divided into a vertical machining center and a horizontal machining center according to the state in which the main shaft is in space. The main axis of the machining center is called a vertical machining center when the space is in a vertical state, and the main axis is in a horizontal state. Machining center. The spindle can be converted vertically and horizontally, called the vertical horizontal machining center or the five-sided machining center, also known as the composite machining center. According to the number of processing center columns; there are single column and double column (gantry type). According to the number of motion coordinates of the machining center and the number of coordinates controlled at the same time: there are three axes and two linkages, three axes and three linkages, four axes and three linkages, five axes and four linkages, and six axes and five linkages. The three-axis and four-axis refer to the number of motion coordinates of the machining center. The linkage refers to the number of coordinates that the control system can control the motion at the same time, thereby realizing the position and speed control of the tool relative to the workpiece. According to the number and function of the workbench: there is a single workbench machining center, a double workbench machining center, and a multi-workbench machining center. According to the processing accuracy: there are ordinary machining centers and high-precision machining centers. The general machining center has a resolution of 1 μm, a maximum feed rate of 15 to 25 m/min, and a positioning accuracy of about 10 μm. The high-precision machining center has a resolution of 0.1 μm, a maximum feed rate of 15 to 100 m/min, and a positioning accuracy of about 2 μm. Between 2 and 10 μm, more than ± 5 μm, can be called precision grade. Maintenance of the CNC machining center guide rail of the turning and milling machine: Steel plate and stainless steel plate machine guide rail cover protect the CNC machine tool guide Steel telescopic rail guards are a traditional form of protection for machine tools. In this field, steel telescopic rail guards are widely used to prevent the entry of chips and other sharp objects, and the cooling can be effectively reduced by certain structural measures and suitable scraping plates. Infiltration of liquid. Our steel telescopic rail cover can meet the ever-increasing requirements of modern machine tools for high technology, correct installation position and high running speed. Technical data: The steel telescopic rail guard is formed by cold pressing of high-quality 2-3mm thick steel plate, and can also be stainless steel according to requirements. Special surface finish will give it an additional value. We can provide the appropriate rail protection type (horizontal, vertical, tilt, lateral) for all machine types. The structure of the shield we have developed varies depending on the operating speed and the guide rail. We run a polyurethane or brass slider below 10m/min. We have rollers under medium speed 30m/min. In addition, a buffer system is required between the drive plate, the scraper plate and the suction plate. The purpose of the slider buffer system is to reduce collisions, noise and friction. The number of sections of the steel telescopic rail guard is important for its proportion, weight and operating characteristics. Each block should be as long as possible, which can reduce the number of sections and reduce costs. In general, the maximum stretch and minimum compression ratio should be between 3:1 and 5:1.

Basic functions and maintenance of CNC machining The numerical control system is the position control system, which has 3 basic functions. 1. input function: refers to the parts processing program and input of various parameters. 2. interpolation function: means of determining some intermediate points between the known points of the actual parts or tracks of the machined parts. The middle point is usually interpolated between the starting point and the end point of a given line or arc. The interpolation methods include pulse increment method and digital increment method. The former is characterized by the generation of a feed pulse in each interpolation operation. The maximum rate of the output pulse depends on the time required to perform an interpolation grate. This method is suitable for the open loop CNC system driven by the stepper motor, and the feed rate is low. The characteristics of the latter are as follows: the whole control system forms a closed loop through the computer, and the grating machine is used to feed and feed back the actual position regularly. The sampling results are compared with the instruction data generated by the interpolation, and the error signals are obtained. Then the spindle feed speed instruction is given. This method is suitable for the position sampling control of the direct and AC servo motor. System system.