Category Archive CNC Technology

Computer numerical control: computer numerical control, referred to as CNC, generally known as CNC abroad, rarely use the concept of NC. Numerical control machine tools refers to the machine tools equipped with computer numerical control system, referred to as CNC machine tools. We have seen CNC machines, but we don’t understand them very well. Let’s take a look at CNC precision parts processing machine tools.

It usually controls the position, angle, speed and other mechanical quantities and the switch value related to the mechanical energy flow direction. The generation of numerical control of computer gong machining depends on the emergence of data carrier and binary data operation. In 1908, the perforated sheet metal interchangeable data carrier came out; at the end of the 19th century, the paper-based control system with auxiliary functions was invented; in 1938, Shannon carried out fast data calculation and transmission at MIT, laying the foundation for modern computers, including computer digital control systems. The numerical control technology of high-speed computer gong machining is developed in close combination with machine tool control. In 1952, the first CNC machine tool came out, which became a great pioneering work in the history of world machinery industry.

characteristic

Compared with ordinary machine tools, CNC precision parts machining machine tools have the following characteristics:

High machining precision and stable machining quality;

It can carry out multi coordinate linkage and process parts with complex shapes;

When the machining parts are changed, only the NC program needs to be changed, which can save the production preparation time;

The machine tool itself has high precision and rigidity. It can choose favorable processing amount and high productivity (generally 3 ~ 5 times of ordinary machine tool);

High degree of automation of machine tools can reduce labor intensity;

Mass production, easy control of product quality;

The requirements for the professional quality of operators are low, and the technical requirements for maintenance personnel are high.

In CNC precision parts processing, the staff should have a very familiar understanding of the machine tool. Mold processing is a kind of artificial intelligence, which is completed by computer control machine tool. The most complex part of the computer gong lies in the control system. The computer processing the computer sends various instructions to control the three axis servo motors of the machine to cooperate with each other according to the established route, so as to process various complex processes and ensure high machining accuracy.

The main component of the body part of the computer gong processing is casting, which is also a major reason affecting the accuracy of the computer gong machine tool. It can even be said that the quality of casting determines the grade of machine tool and the stability of future use. What are the requirements for casting manufacturing, that is, no deformation and enough rigidity. CNC machining does not deformation refers to the actual processing process after leaving the factory, the accuracy of the machine tool remains good, deformation will affect the accuracy. The machining rigidity of mechanical parts is enough for the machine tool to meet the needs of heavy chip processing.

The materials for computer gong machining are usually free cutting steel and copper. The free cutting steel has higher sulfur content and phosphorus content. Sulfur and manganese exist in the steel in the form of manganese sulfide. Manganese sulfide plays a lubricating role in the steel, making the steel easier to cut, thus improving the production progress of lathe bed. So what should be paid attention to when CNC lathe processing?

1. When aligning the workpiece, it is only allowed to move the chuck by hand or turn on the lowest speed for alignment, and do not turn on the high speed for alignment.
2. When changing the rotation direction of the spindle, the spindle should be stopped first and then. It is not allowed to change the rotation direction suddenly.
3. When loading and unloading the chuck, only rotate the V-belt manually to drive the spindle to rotate. It is absolutely forbidden to directly start the machine tool and force it to loosen or tighten. At the same time, a board should be placed on the bed to prevent accidents.
4. The tool installation should not extend too long, the gasket should be flat and straight, and the width should be consistent with the width of the tool bottom surface.

In order to set the knife conveniently, the imaginary point P is often used to set the knife. If there is no tool tip radius compensation, undercut will occur when turning cone or arc. When the accuracy of the part is high and there is a cone or arc, the solution is to calculate the trajectory size of the tool tip arc center, and then compile and calculate the local compensation.

Is the tool position compensation caused by the radius r of tool tip arc when turning dimensional surface. When the tool position compensation is carried out in Z and X directions at the same time, the actual contact point a between the cutting edge and the workpiece moves to the set point P of the tool tip during programming. The compensation amount of R can be calculated by the following formula: when programming the conical surface of the workpiece, the base point coordinates are the coordinates of the base point of the workpiece contour (Z and x) plus the compensation amount of the radius of the tool tip arc R (DZ and DX), thus solving the problem that there is no compensation for the radius of the tool tip arc Questions. Because there is an arc at the tool tip, the workpiece contour is formed by the tool motion envelope, so the motion path of the tool location does not coincide with the contour of the workpiece. In the full function CNC system, the tool compensation instruction can be used to program conveniently according to the contour size of the workpiece. In the economical CNC system, the path of the cutter location can be calculated according to the contour size of the workpiece and the cutter. According to this programming, it can also be solved by the method of local compensation.

In order to improve the work efficiency and reduce the errors of various operations, the safe operation that should be paid attention to in the process of C is summarized as follows:

1. Try to install the clamping material first and then the cutting tool to prevent the hand from touching the tool when installing the clamping material. If the tool has been installed, the worktable should first be moved to the outside to ensure that the clamping material will not interfere with the tool, so as to avoid injury or breakage of the tool.
2. After stopping, it is necessary to observe whether the spindle stops rotating when disassembling the tool.
3. Don’t hold or pinch the edge of the knife when unloading it to avoid scratching.
4. In the process of machining mechanical parts, operators are not allowed to observe the cutting position closely to prevent chips from falling into eyes.
5. The wrench should be placed in the tool storage area after use, not on the y-axis shield or beam.
6. Before CNC machining, check the position of the oil nozzle before opening the oil pump switch to avoid spraying to other positions when flushing oil.
7. When suspending observation during machining clearance, the worktable must be moved away from the cutting position.
8. Inspection. After processing, before disassembling the workpiece, it is necessary to conduct preliminary inspection on the size or appearance of the workpiece. The workpiece can only be disassembled after passing the inspection, so as to avoid positioning problems of secondary processing and scrapping of the workpiece after disassembly. For some key dimension data of the disassembled workpiece, further inspection is needed to meet the requirements.

The performance of guide rail directly affects the machining accuracy, bearing capacity and performance of the machine tool. The common guide ways of machine tools include sliding guide, rolling guide and hydrostatic guide.

1、 Characteristics of sliding guide, rolling guide and hydrostatic guide

1 slide guide

Sliding guide has the advantages of simple structure, convenient manufacturing, good stiffness and strong seismic resistance. It is widely used in general machine tools, and is often made of cast iron or steel inlaid guide rail. In order to improve the wear resistance and accuracy of the guide rail, the surface of the guide rail is generally quenched and then ground.

2 Rolling Guide

The rolling guide rail is a rolling element installed between the working faces of the guide rail. The rolling element can be ball, roller and needle. The contact between the rolling guide rail and the guide rail is point contact or line contact. Therefore, the friction coefficient of the guide rail is small. The static and dynamic friction coefficients are basically the same, the starting resistance is small, the low-speed motion stability is good, the positioning accuracy is high, the micro displacement is accurate, the wear is small, the accuracy retention is good, and the service life is long. Its disadvantages are poor seismic resistance and high protection requirements. Rolling guide, especially linear rolling guide, has been widely used in recent years. With the development of CNC machine tools to high speed, linear guide rail is more and more widely used.

3 hydraulic guide rail

The hydraulic guide rail used on the machine tool is mainly hydrostatic guide. Hydrostatic guideway is usually filled with pressure oil between two relative moving guide surfaces to make the moving parts float. The oil pressure can be adjusted automatically with the change of the external load to ensure that the friction between the guide surfaces is always in the pure liquid state. Therefore, the friction coefficient of the hydrostatic guide is the minimum and the power consumption is small. This kind of guide rail is not easy to wear, and has good precision retention and long service life. Its oil film thickness is almost not affected by the speed. The oil film has large load-carrying capacity, high rigidity, good shock absorption, stable operation and no creeping phenomenon. The structure of hydrostatic guideway is complex, and the hydraulic device with good filtering effect is needed, so the manufacturing cost is high.

It is very important to select NC tools correctly. The general requirements of NC tools are convenient adjustment, good rigidity, high precision and good durability. On this basis, the cutting performance of workpiece materials, the machining capacity of machine tools, the types of NC machining processes, cutting parameters and many factors related to the working range of machine tools and CNC devices are comprehensively considered.

When compiling the sequence.

1. The factors affecting the selection of NC tools

When selecting the type and specification of cutting tools, the following factors are mainly considered:

1. Production property here refers to the batch size of parts, mainly considering the influence of processing interest on tool selection. For example, it may be cost-effective to use special tools in mass production, while it is more suitable to select standard tools for single piece or small batch production.

2 machine type

The NC machine tool used to complete the process affects the selected tool type (drilling, turning or milling). Under the condition that the rigidity of workpiece system and tool system is good, high productivity tools such as high speed cutting tool and large feed rate turning tool are allowed.

3 NC machining scheme

Different types of cutting tools can be used in different NC machining schemes. For example, drilling and reaming drills can be used for hole processing, as well as drills and boring cutters.

4 dimension and shape of workpiece

The size and shape of workpiece also affect the selection of tool type and specification, for example, special tool is used to process special surface.

1. Surface roughness

For example, rough milling cutter can be used in rough milling, and fine tooth milling cutter is better used in finish milling.

1. Machining accuracy machining accuracy affects the type and structural shape of finishing tools. For example, the final machining of holes can be processed by drilling, reaming, reaming or boring tools according to the accuracy of holes.

7 workpiece material

Workpiece data will determine the selection of tool data and cutting local geometric parameters. Tool data is related to the machining accuracy and hardness of workpiece.

1. Performance requirements of NC tools

Due to the characteristics of high machining accuracy, high efficiency, centralized processing procedures and less clamping times of parts, higher requirements are put forward for the CNC tools used. In terms of tool performance, CNC tools should be higher than those used in ordinary machine tools.

When selecting NC tools, first of all, we should give priority to the selection of standard tools. When necessary, we can choose various high-efficiency composite tools and special special tools. When selecting the standard NC tools, we should combine the actual situation and select various advanced tools as far as possible, such as indexable tools, integral cemented carbide tools, ceramic tools, etc.

The following problems should also be considered when selecting cutting tools for CNC machine tools

1. The type, specification and accuracy grade of NC tools shall meet the processing requirements, and the tool data shall be compatible with the workpiece data.
2. Good cutting performance. In order to adapt to the large back feed and high feed rate when the tool is used in rough machining or workpiece processing of difficult to machine materials, the tool should be able to accept high-speed cutting and powerful cutting. At the same time, the same batch of cutting tools must be stable in terms of cutting performance and tool life, so as to realize tool change according to tool life or manage tool life by CNC system.
3. High precision. In order to meet the requirements of high precision and automatic tool change in NC machining, the tool must have high accuracy. For example, the radial dimension accuracy of some integral end mills is as high as 0.005mm
4. High reliability. To ensure that the NC machining will not occur unexpected damage and potential defects affecting the processing

(l) Before writing or programming processing, the workpiece processing program should be prepared first. When the workpiece processing program is long and complex, it is better to program on the machine tool. When using the programming machine or computer programming sample to avoid occupying the machine, the short program should also be written on the program sheet

(2) Start the machine first and then turn on the machine. The system has the design of interlock. The power on of the machine tool is displayed on the CRT

(3) Back to the reference point for incremental control system (using incremental position detection element) machine tool, the first step must be taken to establish the coordinate moving datum of the machine tool

(4) According to the program storage medium (paper tape or magnetic tape, disk), the debugging program is input by paper tape reader, cassette tape machine, programming machine or serial port communication. If the simple program is directly input into CNC control panel by keyboard, if the program is very simple and only the workpiece program is not saved, it is necessary to use MDI mode to input and process segment by segment. In addition, the program uses workpiece origin, tool parameters, and so on Offset and various compensation must be input before processing

(5) If the program editing input program needs to be modified, the editing operation must be carried out. At this time, the mode selection switch is set to the editing position, and the edit key is used to add, delete and change. For the editing method, see the corresponding instructions

(6) Machine lock running program this step checks the program, if there is an error, you need to edit again

(7) The workpiece is loaded and the tool alignment and tool setting are continuously moved by manual incremental movement, or the tool starting point of the machine tool is moved to the start of the program and the tool reference is aligned

(8) Starting coordinate feed for continuous processing generally adopts memory program processing mode, which has lower failure rate than using program processing on paper tape. The feed speed is adjusted by feed rate switch. Press feed hold button to pause feed movement, observe processing condition or conduct manual measurement, and then press the cycle start button to resume processing, so as to ensure that the program is correct. Before processing, recheck the over milling It is more intuitive to use pencil instead of tool paper when machining plane curve workpiece. If the system has the function of tool path simulation, it can be used to check the correctness of the program

CNC manufacturers introduce the programming method of milling machine

1、 Programming method of NC milling machine

In order to learn NC milling machine programming well, we must understand the operation points of CNC milling machine. Most of the existing textbooks do not regard the operation and programming of CNC milling machine as a whole.

2、 Setting machine coordinate system of CNC milling machine

CNC milling machine manufacturers introduced CNC milling machine coordinate system determination method is similar to CNC lathe, but CNC milling machine has x, y, Z three axis. Confirm the machine coordinate system by returning to the mechanical zero point. After the machine is turned on, the worktable will return to the machine tool origin (or reference point, which is a point with a fixed distance from the origin of the machine tool). CNC milling machine return to zero, the steps are: the switch is placed in the “return to zero” position. Press the manual axis feed direction keys + X, + y, + Z until the return to zero indicator light is on. Setting the mechanical origin of machine tool is directly related to g54 instruction in programming.

3、 Setting workpiece coordinate system of CNC milling machine

Workpiece coordinate system is the coordinate system used in programming, also known as programming coordinate system. The coordinate system is artificially set. The establishment of workpiece coordinate system is an essential step before CNC milling machine processing. CNC milling machine establishes workpiece coordinate system by tool setting.

The application of CNC mirror machining technology makes the metal surface roughness effect more ideal. For the mirror surface processed by CNC, its roughness is far less than 0.8um, which can reach 0.06, and the metal surface can reflect the image of the object more clearly. What’s more, the mirror machining efficiency of precision mold under the traditional technology is not high. The application of CNC mirror processing technology can effectively improve the processing efficiency of the mold. At the same time, CNC mirror processing technology can be used for mirror processing of raw materials of various materials, without too many limitations on the processing of raw materials. Although direct CNC mirror processing, the workpiece surface itself will always appear some knife marks, but in the later stage, there are subsequent processes of mold saving and polishing.

With time, when we are more proficient in the use of CNC mirror processing technology to cut metal, the surface roughness of machined parts will be lower, more in line with the desired finish, better applied to machinery. CNC lathe processing, is generally referred to in the CNC machine tool parts processing process. CNC machine tool is a kind of machine tool controlled by computer. The computer used to control the machine tool, whether it is a special computer or a general-purpose computer, is collectively referred to as the numerical control system. The motion and auxiliary action of NC machine tool are controlled by the instruction of NC system.

The instruction of CNC system is compiled by the programmer according to the material of the workpiece, processing requirements, characteristics of the machine tool and the instruction format (NC language or symbol) specified by the system. According to the program instruction, the CNC system sends operation or terminal information to the servo device and other functional components to control the various movements of the machine tool. When the processing program of the part is finished, the machine will stop automatically. Dongguan mold factory any kind of CNC machine tool, in its CNC system, if there is no input program instructions, CNC machine tools can not work.

The controlled actions of machining machine tools generally include the starting and stopping of the machine tool; the starting and stopping of the spindle, the change of rotation direction and speed; the direction, speed and mode of feed motion; the selection of cutting tools, the compensation of length and radius; the replacement of cutting tools, the start and close of coolant, etc.

At the beginning of CNC machine tool, aircraft parts with complex surface are selected as processing objects, which is the key to solve the problem of ordinary machining methods. The most important feature of NC machining is that the machine tool is controlled by perforated tape (or tape) for automatic processing.

Due to the different characteristics of aircraft, rocket and engine parts: the size of parts and components of aircraft and rocket is large and the profile is complex; the size of engine parts and components is small and the accuracy is high.

Therefore, the CNC machine tools used by aircraft, rocket manufacturing and engine manufacturing departments are different. In aircraft and rocket manufacturing, large-scale CNC milling machines with continuous control are mainly used, while in engine manufacturing, both continuous control CNC machine tools and point controlled CNC machine tools (such as CNC drilling machine, CNC boring machine, machining center, etc.) are used in engine manufacturing.

Five axis linkage is the term of numerical control. Linkage means that the axis of CNC machine tool reaches a certain set point at a certain speed at the same time. Five axis linkage means that all five axes can be used. Five axis CNC machine tool is a kind of machine tool with high technology content and high precision, which is specially used for machining complex curved surface.

Five axis machine tools include vertical, horizontal and cradle type two axis NC table, NC table NC dividing head, NC table 90 axis, NC table 45B axis, NC table a axis, two axis NC spindle and so on. There are 7 kinds of five axis linkage modes in the above six categories. They all have their own characteristics. It is impossible to say which form is better, but what type of five axis machining is suitable for your products.

(1) Five axis linkage double turntable machine tool

(A) The rotation coordinate has enough travel range and good process performance

Five axis linkage 3

(B) The rigid part of the machine tool is much higher than that of the whole machine tool

(C) It is easy to develop into a machining center. It only needs to install independent tool magazine and tool changing manipulator. However, the coordinate driving power of the turntable of double turntable machine tool is large, and the coordinate conversion relationship is complex;

(2) Five axis linkage double swing head machine tool

The driving power of swing coordinate of double swing head machine tool is small, the loading and unloading of workpiece is convenient, and the relationship of coordinate transformation is simple

(3) Five axis linkage machine tool with one swing head and one turntable

The performance of a swing head and a rotary table type machine tool is between the above two

1. It can effectively avoid tool interference
2. For ruled surface parts, side milling can be used to form one tool
3. For general solid surface, especially for large flat surface, the end face of large diameter end milling cutter can be used for machining
4. It can carry out multi face and multi process processing for multiple space surfaces on the workpiece at one time
5. In five axis machining, the tool can be in the most effective cutting state relative to the workpiece surface. The error distribution on the part surface is uniform
6. In some cases, larger size tools can be used to avoid interference.

Current and future research focus of 5-axis CNC machining

The so-called line contact machining refers to the processing method of line contact forming in the process of machining, such as cylindrical peripheral milling, conical milling, camphor shaped hole cutting and abrasive belt grinding, etc. the characteristics of this processing method are: due to the high cutting speed at the cutting point, it can obtain higher machining accuracy, at the same time, due to the line contact molding, it has higher processing efficiency, and has developed to the corresponding task Research on line contact machining of Italian curved surface.

The use of five axis machine tool makes it easy to clamp the workpiece. No special fixture is needed in the process, which reduces the cost of the fixture, avoids multiple clamping and improves the machining accuracy of the die. Using five axis technology can reduce the number of fixtures. In addition, because the five axis machine tool can save many special tools in the processing, so the tool cost is reduced. Five axis machine tool can increase the effective cutting edge length, reduce the cutting force, improve the tool life and reduce the cost.

The use of five axis machine tool processing mold can quickly complete the mold processing, delivery, better guarantee the mold processing quality, make the mold processing easier, and make the mold modification easier. Ball end milling cutter is widely used in modern mold processing. The advantages of ball end milling cutter in mold processing are obvious. However, if the vertical machining center is used, the linear speed of the bottom surface is zero, so the bottom surface finish is very poor. If the four or five axis linkage machine tool processing technology is used to process the mold, the above shortcomings can be overcome.

Firstly, linear motor drive technology is used. The advantages of linear motor are linear drive, no drive chain, no wear, no reverse clearance, so it can achieve the best positioning accuracy. The linear motor has high dynamic performance, and the acceleration can exceed 2G. Linear motor drive also has the characteristics of high reliability and maintenance free.

The second is the use of dual drive technology. For the wide worktable or gantry type, if the middle drive is adopted, it can not guarantee that the driving force is in the center, which is easy to cause inclination and poor dynamic performance. Using double drive, double grating ruler and one driving module, the dynamic performance is perfect. A driver instruction, dual drive work at the same time, grating ruler to detect whether the two points are balanced, if not, through different instructions to achieve balance.

Machining center is generally divided into vertical machining center and horizontal machining center. The most effective machining surface of vertical machining center (three axis) is only the top surface of workpiece, and the horizontal machining center can only complete the four sides processing of workpiece with the help of rotary table. The high-grade machining center is developing towards the direction of five axis control. The five axis linkage machining center has the characteristics of high efficiency and high precision. The workpiece can be processed in one clamping. High grade CNC system can also be used for high precision machining of high-end space, such as automobile

The introduction of CNC cutting technology precision 1. Multiple cutting technology multi cutting technology is the fundamental means to improve the machining accuracy and surface quality of low-speed WEDM. It is a scientific integration of design and manufacturing technology, numerical control technology, intelligent technology, pulse power technology, precision transmission and control technology. Generally, through one-time cutting forming, secondary cutting to improve the accuracy, more than three times to improve the surface quality. In order to achieve high-quality surface, the number of times of cutting is as high as 7-9 times, but now it only needs 3-4 times. 2. The corner processing technology is constantly optimized and improved. Because of the lag of the electrode wire when cutting the corner, the corner will collapse. In order to improve the accuracy of corner cutting, researchers have adopted more dynamic corner processing strategies. Such as: change the wire path; change the processing speed (sheet); automatic adjustment of water pressure; control of processing energy. By using the integrated corner control strategy, the corner shape error can be reduced by 70% and the matching accuracy of 5 μ M can be achieved at one time. 3. High speed CNC adopts the technology of improving flatness. High precision finishing circuit is the technology of improving flatness, which is considered to be of great significance to thick workpiece processing. 4. The structure of the machine tool is more precise. In order to ensure high-precision machining, many technical measures are adopted to improve the accuracy of the host machine: ① control the temperature. Using water temperature cooling device, the temperature inside the machine tool is the same as the water temperature, and the thermal deformation of the machine tool is reduced. ② Linear motor is adopted. High response, precision positioning can achieve 0.1 μ m equivalent control, feed no vibration, no noise, improve discharge frequency, maintain stable discharge, twice cut ry5 μ M. ③ The thermal inertia of ceramic and polymer artificial granite is 25 times larger than that of cast iron, which reduces the influence of temperature change on cutting accuracy. ④ Fixed worktable and column moving structure are adopted to improve the bearing capacity of worktable, which is not affected by immersion processing and workpiece weight change. ⑤ Immersion machining is used to reduce the thermal deformation of the workpiece. ⑥ Motor servo, closed loop wire tension control. ⑦ High precision tool setting: using voltage modulation tool setting power supply. The tool setting accuracy can reach ± 0.005mm without damaging the workpiece, whether dry or wet. 5. In order to carry out the micro precision machining of small fillet, narrow slot, narrow slot and micro parts, high-speed CNC wire cutting technology is researched by many manufacturers. At present, the main manufacturing enterprises of EDM in the world can use 0.02-0.03mm electrode wire for cutting. Precision surface grinder is a common machine tool for machining. There are high requirements for the motion stability, commutation accuracy and commutation frequency. At present, the surface grinding machine is developing towards large-scale and high-speed, and the reciprocating speed of some surface grinding machines has reached 40% n []. Large high-speed surface grinder has a large inertia. When it changes direction, it will lead to a sharp rise in back pressure, resulting in reversing impact, which will have a disastrous impact on the machine tool. Therefore, the stability of reversing has become an important factor restricting the improvement of the working speed and machining accuracy of the grinder. The reversing mode and reversing control parameters in the system play a decisive role in reversing impact. The surface grinder adopts hydraulic transmission. It is urgent to design a new hydraulic reversing system. In this paper, the reversing impact of grinder is discussed from the perspective of commutation method and control strategy. 1. The mechanism of reversing impact is that in its hydraulic system, when the hydraulic transmission surface grinder changes direction. The valve port of the directional valve is closed instantaneously, and the oil circuit is suddenly disconnected, which makes the oil in the oil return chamber unable to drain. The larger m and V, we can see. The greater the kinetic energy, the greater the reversing impact. For the surface grinder with large inertia and high speed, its reversing impact is huge, which not only affects the machining accuracy of the machine tool, but also hinders the normal operation and service life. 1. Product analysis through product analysis should obtain certain composition information and some specific processing requirements. 2. Graphic design graphic design the graphic design should be based on the detailed analysis of the product, determine the type of graphics by analyzing the processing requirements, and draw through the graphics software. 3. Process planning is based on the analysis of the appearance and processing requirements of the workpiece products in the early stage, so as to reasonably establish each processing step from the overall processing situation. 4. In fact, the process of path generation is to realize the process planning through software, and optimize the tool path by setting parameters. 5. After the path simulation path is generated, we generally have no intuitive sense of its final performance on the machine tool. Here we can check the possible problems through path simulation, thus reducing the actual processing scrap rate. The general inspection focuses on the effect of workpiece appearance, whether it is overcut or undercut, and whether the process planning of the path is reasonable. 6. Path output path output is a necessary step for software design and programming to realize on the machine tool. Through the path output, the relationship between the two can be established by the intermediate reference. If you have a professional background in CNC, it can also be understood as the post-processing of tool path.

The basic knowledge of high speed computer gong processing feeding mechanism

1. Auxiliary device computer gong processing index control feed machine some necessary supporting parts, to ensure the operation of CNC feeder, such as cooling, chip removal, lubrication, lighting, monitoring, etc. It includes hydraulic and pneumatic devices, chip removal device, exchange table, CNC turntable and CNC dividing head, as well as cutting tools and monitoring and detecting devices.
2. Driving device high speed Gong machining is the driving part of the executive mechanism of NC feeding machine, including spindle drive unit, feed unit, spindle motor and feed motor. Under the control of the electric servo system or hydraulic control of the spindle. When several feed linkage, positioning, straight line, plane curve and space curve processing can be completed.
3. The main machine is the main body of CNC feeding machine, including body, column, spindle, feed mechanism and other mechanical parts. It is a mechanical part used to complete various cutting processes. Programming and other auxiliary equipment: it can be used to program and store parts outside the machine.
4. High speed Gong machining of CNC device is the core of NC feeding machine, including hardware (printed circuit board, CRT display, key box, paper tape reader, etc.) and corresponding software, which are used to input digital part program, complete input information storage, data transformation, interpolation calculation and realize various control functions. Basic requirements of large CNC machining system
5. In the process of large CNC machining, the worktable may require forward or reverse operation at any time according to the shape of machining track. CNC lathe machining center prompts you to consider the conversion of electrical energy and mechanical energy between starting and braking during forward and reverse operation, so as to realize rapid braking.
6. In order to adapt to different processing conditions, servo has a wide range of speed regulation and excellent speed control characteristics.
7. High rigidity and high speed stability servo for large CNC machining should keep the feed rate constant under different load conditions or when the cutting conditions change, which requires the servo to have excellent static and dynamic load characteristics.

In order to ensure the contour cutting shape accuracy and low surface roughness of the machined surface, the servo should have good fast response characteristics and no overshoot.

1. High precision in order to meet the machining accuracy, it is necessary to ensure the positioning accuracy and feed accuracy of the machine tool, that is to say, the servo should have high static resolution, and the dynamic characteristics should be at least a first-order error free system.
2. Large CNC machining low speed and high torque, the characteristics of machine tool processing is cutting at low speed, the feed drive should ensure rated torque output at low speed, that is to say, servo should have constant torque output.

Function debugging of high speed computer gong machine tool accuracy

1. High speed computer gongs use precision level instrument and other detection tools, mainly by adjusting the pad iron way to fine adjust the level of the main bed of the machine tool, so that the geometric accuracy of the machine tool can reach the allowable tolerance range;
2. For the automatic tool change device, adjust the position of the tool magazine, manipulator, travel parameters, etc., and then check the action with the command, which is required to be accurate;
3. For the machine tool with APC automatic exchange table, after adjusting the relative position, carry out automatic load exchange;
4. After the adjustment of the machine tool, carefully check whether the parameter setting values in the numerical control system and the programmable controller conform to the data specified in the random index, and then test the main operation functions, safety measures, execution of common instructions, etc.
5. Mold processing to check the machine tool auxiliary function and accessories normal work. It is usually composed of CNC system, main drive system, feed servo system, cooling smooth system and so on. 1. The spindle box contains the spindle box and spindle drive system, which is used to clamp and rotate the cutter. The spindle speed scale and output torque have a direct impact on the machining. 2. The feed servo system is composed of feed motor and feed actuator. According to the feed rate set by the program, the relative motion between the tool and the workpiece is completed, including linear feed motion and rotary motion. 3. Control system CNC milling machine motion control in the middle of the implementation of NC machining program control machine tools for processing. 4. Auxiliary equipment such as hydraulic, pneumatic, smooth, cooling system and chip removal, protection and other equipment. 5. The base parts of high-speed computer gong machine tools usually refer to the base, column, beam, etc., which are the foundation and structure of the whole machine tool. Die making technology of extrusion die for high speed CNC machining of aluminum profile 1. Due to the bad working conditions of aluminum alloy extrusion tools and dies, high temperature, high pressure and high friction are required in high-speed CNC machining. Therefore, high-strength heat-resistant alloy steel is required. The melting, casting, forging, heat treatment, electrical machining, mechanical processing and surface treatment of these steels are very complex, which brings about the development of die and mold A series of difficulties. 2. In order to improve the service life of tools and moulds and ensure the surface quality of products, it is required that the roughness of the working belt of the die cavity should reach 0.8-0.4 μ m, and the roughness of the die plane should be less than 1.6 μ M. therefore, special polishing process and polishing equipment should be adopted when making the mold. 3. Due to the development of extrusion products in the direction of high precision and sharp, the wall thickness requirement of some profiles and pipes is reduced to about 0.5mm, and the tolerance of extruded products is required to reach ± 0.05mm. In order to extrude such ultra-high precision products, the manufacturing accuracy of dies is required to reach 0.01mm