CNC Technology – Page 73 – CNC Machining & Turning, Milling, Metal parts

Intelligent fault replay and fault simulation technology for CNC machining

Adaptive control technology of machining process: through monitoring the cutting force, power, current, voltage and other information of the spindle and feed motor in the process of machining, the traditional or modern algorithm is used to identify the force, wear and damage status of the cutting tool and the stability state of the machine tool, and adjust the processing parameters (spindle speed, feed speed) in real time according to these states In order to improve the machining accuracy, reduce the surface roughness and improve the safety of the equipment operation, the equipment is in the best operation state;

(2) Intelligent optimization and selection of processing parameters: the experience of process experts or technicians, the general and special laws of parts processing, and the modern intelligent methods, such as computer gong processing, Dongguan computer gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing, are used to construct the intelligent optimization and selector of processing parameters based on expert system or model The optimized processing parameters are obtained to improve the programming efficiency and process level and shorten the production preparation time;

(3) Intelligent fault self diagnosis and self repair technology: according to the existing fault information, the application of modern intelligent methods to achieve rapid and accurate fault location;

(4) Intelligent fault playback and fault simulation technology: it can record all kinds of information of the system, replay and simulate all kinds of errors and accidents of CNC machine tools, so as to determine the causes of errors, find out solutions to problems, and accumulate production experience;

(5) Intelligent AC servo drive device: it can automatically identify the load and automatically adjust the parameters of the intelligent servo system, including intelligent Spindle AC drive device and intelligent feed servo device. The driving device can automatically identify the moment of inertia of the motor and load, and automatically optimize and adjust the parameters of the control system, so that the drive system can get the best operation;

(6) Intelligent 4m numerical control system: in the manufacturing process, the integration of processing and testing is an effective way to realize rapid detection and response of rapid manufacturing, computer gong processing, Dongguan computer gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing, measuring, modeling, manufacturing, and manufacturing The four parts (namely 4m) are integrated into one system to realize information sharing and promote the integration of measurement, modeling, processing, clamping and operation.

5. Open system

(1) Open to the future technology: because the software and hardware interfaces follow the recognized standard protocol, only a small amount of redesign and adjustment is needed, the new generation of general software and hardware resources may be adopted, absorbed and compatible by the existing system, which means that the development cost of the system will be greatly reduced, and the system performance and reliability will be continuously improved and will be in a long life cycle;

(2) Open to users’ special requirements: update products, expand functions, provide various combinations of hardware and software products to meet special application requirements;

(3) Establishment of numerical control standard: a new CNC system standard iso14649 (STEP-NC) is being researched and formulated internationally to provide a neutral mechanism independent of specific system, which can describe the unified data model of the whole product life cycle, so as to realize the standardization of product information in the whole manufacturing process and even in various industrial fields. The standardized programming language is not only convenient for users to use, but also reduces the labor consumption directly related to operation efficiency.

6-drive parallelization

Parallel motion machine tool overcomes the inherent defects of traditional machine tool series mechanism, such as high mass of moving parts, low system stiffness, tool can only feed along fixed guide rail, low degree of freedom of operation, and insufficient flexibility and mobility of equipment processing The length of the rod enables the platform supported by the bar system to obtain the corresponding degree of freedom movement, which can realize multi coordinate linkage NC machining, assembly and measurement functions, and can meet the processing of complex special parts. It has the advantages of high modularity, light weight and fast speed of modern robot.

As a new type of processing equipment, parallel machine tool has become an important research direction of current machine tool technology. It has been highly valued by the international machine tool industry. It is considered as “the most significant progress in the machine tool industry since the invention of numerical control technology” and “a new algebraic control processing equipment in the 21st century”.

7. Extreme (large scale and miniaturization)

The development of national defense, aviation and aerospace and the large-scale of energy and other basic industrial equipment need the support of large-scale and good performance CNC machine tools. Ultra precision machining technology and micro nano technology are strategic technologies in the 21st century, and new manufacturing processes and equipment that can adapt to micro size and micro nano machining accuracy need to be developed. Therefore, the demand for micro machine tools, including micro cutting (turning, milling, grinding) machines, micro electro machining machines, micro laser machining machines and micro presses, is gradually increasing.

8. Information exchange networking

For the enterprises facing fierce competition, it is very important to make CNC machine tools have bidirectional and high-speed network communication function, so as to ensure the smooth flow of information among various departments in the workshop. Computer gong processing | Dongguan computer gong processing | Shenzhen computer gong processing | mechanical parts processing | Guangzhou computer gong processing | not only can realize the network resource sharing, but also can realize the remote monitoring, control, training, teaching and management of CNC machine tools, and also can realize numerical control equipment

Use and maintenance of CNC machining

The use of integrated electronic components, chips and VLSI is the guarantee of the reliability of large-scale mechanical parts processing equipment. Many functions are realized by software, which reduces the number of hardware. Rich fault diagnosis and protection functions (mostly realized by software) can reduce the frequency of system failure and the repair time after failure.

2. Computer gong processing, easy to use and maintain

Easy to operate: users only need to follow the menu to operate correctly. Convenient programming: it has a variety of programming functions, automatic program verification and simulation functions. Convenient maintenance and repair: some routine maintenance work is carried out automatically (lubrication, regular inspection of key components, etc.), and the self diagnosis function of CNC machine tool can quickly realize accurate fault location.

3. Computer gong processing is easy to realize mechatronics

The small volume of CNC system control cabinet (using computer, the number of hardware is reduced; the integration of electronic components is higher and higher, and the hardware is constantly decreasing), which makes it possible to combine it with machine tool in physics, reduce the floor area and facilitate operation.

4. Computer gong processing has flexibility and versatility

Most of the functions of mechanical parts processing device are realized by software, and the software and hardware adopt modular structure, which makes the modification and expansion of system functions more flexible. The basic configuration of mechanical parts processing device is universal. Different CNC machine tools only configure corresponding specific function modules to achieve specific control functions.

5. Computer gong processing has rich functions of numerical control

Interpolation function: quadratic curve, spline, spatial surface interpolation

Compensation function: motion precision compensation, random error compensation, nonlinear error compensation, etc

Man machine dialogue function: dynamic and static tracking display of processing, advanced man-machine dialogue window

Control of CNC machine tool point by point

Multi coordinate CNC machine tool. Some complex shape parts can not be processed with three coordinate CNC machine tools, such as propeller, aircraft curved surface parts processing, etc. it needs more than three coordinate synthesis movement to process the required shape. Therefore, the multi coordinate CNC machine tool appears, which is characterized by the number of axes controlled by the numerical control device, and the structure of the machine tool is also relatively complex. The number of coordinate axes usually depends on the process requirements of processing parts. Now commonly used is 4, 5, 6 coordinates of CNC machine tools. Computer gong processing, Dongguan computer gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing, figure 1 is a five axis CNC machining schematic diagram. At this time, x, y, Z coordinates can be linked with the rotation of the turntable and the swing of the cutting tool at the same time to process the wing and other parts.

2. Classification according to the motion track of CNC machine tools

According to the relative motion trajectory between the tool and the workpiece that can be controlled, CNC machine tools can be divided into point control CNC machine tools, point position linear control CNC machines, contour control CNC machines, etc. They are as follows:

(1) Point control CNC machine tool. The numerical control device of this kind of machine tool can only control the moving parts of the machine tool to move accurately from one position (point) to another, that is, only the coordinate value of the end of travel is controlled, and no cutting is carried out in the moving process. As for the moving speed and route between the two key points, it depends on the productivity. In order to achieve as high productivity as possible on the basis of accurate positioning, the movement between the two related points first moves quickly to the new position, and then slows down by 1-3 levels to make it approach the positioning point slowly to ensure its positioning accuracy.

This kind of machine tools are mainly CNC coordinate boring machine, CNC drilling machine, CNC punch and CNC measuring machine, and the corresponding CNC device is called point position control device.

(2) Point position linear control CNC machine tool. When this kind of machine tool works, it is necessary to control not only the position (i.e. distance) between two related points, but also the moving speed and route (i.e. trajectory) between the two related points. Its route is generally composed of straight lines parallel to each axis. It is different from the point position control CNC machine tool in that when the moving parts of the machine tool move, it can cut along a coordinate axis (generally, it can also cut along a 45 ° oblique line, such as computer gong machining, Dongguan computer gong machining, Shenzhen computer gong machining, mechanical parts processing, Guangzhou Electric gongs processing, but not along any slope straight line cutting), and its auxiliary functions There are more CNC machine tools than point position control, for example, to increase spindle speed control, cycle feed processing, tool selection and other functions.

This kind of machine tools mainly include simple CNC lathe, CNC boring and milling machine and CNC machining center. The corresponding numerical control device is called point position linear control device.

(3) Contour control CNC machine tool. The control device of this kind of machine tool can control two or more coordinate axes continuously at the same time. During processing, not only the starting point and the end point should be controlled, but also the speed and position of each point in the whole processing process should be controlled, so that the machine tool can process the parts with complex shapes that meet the requirements of drawings. Its auxiliary functions are relatively complete.

This kind of machine tools are mainly CNC lathes, CNC milling machines, CNC grinding machines and electrical machining machines. Its corresponding numerical control device is called contour control device (or continuous control device).

3. According to the control mode of servo system

CNC machine tools can be divided into open-loop and closed-loop according to whether there is a feedback device for the controlled quantity. In the closed-loop system, according to the position of the measuring device, it can be divided into full closed-loop and semi-closed-loop. Based on the open-loop system, an open-loop compensation CNC system is developed.

(1) Open loop control CNC machine tool. In the open-loop control, there is no feedback device for the machine tool (see Fig. 2). The signal sending process of the numerical control device is unidirectional, so there is no system stability problem. Because of the unidirectional flow of the signal, it does not check the actual position of the moving parts of the machine tool, so the machining accuracy of the machine tool is not high, and its accuracy mainly depends on the performance of the servo system. The working process is as follows: the input data is calculated by the numerical control device, and the command pulse is distributed, and the controlled working table is moved by the servo mechanism (the servo element is usually the stepping motor).

This kind of machine tool has the advantages of stable operation, quick response, convenient debugging and simple maintenance, but its control accuracy is limited. It is suitable for medium and small NC machine tools with general requirements.

(2) Closed loop control CNC machine tool. Because the precision of open-loop control can not meet the requirements of precision machine tool and large-scale machine tool, its actual working position must be detected. Therefore, a feedback device is added to the open-loop control CNC machine tool to detect the position of the moving parts of the machine tool at all times during the processing, so as to make it consistent with the position required by the CNC device, so as to achieve high machining accuracy.

The block diagram of closed-loop control system is shown in Fig. 3. In the figure, a is the speed measuring element and C is the position measuring element. When the command value is sent to the position comparison circuit, if the table does not move, there is no feedback in computer gong processing, Dongguan computer gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing, and the command value makes the servo motor rotate. The speed feedback signal is sent to the speed control circuit through a, and the actual displacement of the workbench is fed back to the position by C Set the comparison circuit with the command value, control with the difference value of comparison until the difference is eliminated, and finally realize the accurate positioning of the workbench. This kind of machine tool

CNC machine tool operation

1. Confirm the model, size and machining allowance of the blank according to the program sheet before operation, and sand and grind the blank

2. Confirm the position of the workpiece, computer gong processing, Dongguan computer gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing and the processing sequence to complete the table comparison

3. If it is necessary to “divide the middle rod”, the rotating speed is 501r / m. if the tool is used to divide the center, the speed depends on the tool, such as computer gong processing, Dongguan high speed computer gong processing, Dongguan mold processing, Dongguan Mechanical parts processing, CNC processing. In this process, it should also be noted that the data must be taken at the same height to ensure the accuracy of the separation. After the separation, the “G0 g54 x0 Y0” can be used for inspection

4. Before formal processing, check and confirm whether the position of the workpiece is placed and whether the fetching is correct

C. Precautions in CNC machining

1. Before machining in each program, it is necessary to strictly confirm whether the tool is consistent with the program

2. When installing the tool, confirm whether the length of the tool and the selected tool holder are suitable

3. In the same workpiece, each tool setting should be kept in the same area to ensure the accuracy of tool connection

4. Air blowing should be used as much as possible in roughening procedure, computer gong processing, Dongguan computer gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing, and oil injection in the light knife program

5. Clean the aluminum slag in the machine tool before the smooth knife oil injection to prevent the aluminum slag from absorbing oil

6. During the operation of the machine tool, the operator shall not leave the machine tool or regularly check the operation status of the machine tool. If it is necessary to leave midway, relevant personnel must be designated to check

7. If too much machining allowance is found in the process of processing, computer gong processing, Dongguan high-speed computer gong processing, Dongguan mold processing, Dongguan Mechanical parts processing, CNC processing must use “single section” or “pause” to clear x, y, Z values, and then manually mill them off, and then swing back to “zero” to let them run by themselves

8. In case of tool collision during CNC processing, the operator must stop the machine immediately, such as pressing the “emergency stop” button or “reset key” button or setting the “feed rate” to zero

The steps of working out process specification in machining process

So in the process of machining, what are the steps to formulate the process specification? Let’s take a look at it

1) Calculate the annual production program and determine the type of production.

2) Analyze the part drawing and product assembly drawing, and analyze the process of parts.

3) Select the blank.

4) Draw up the process route.

5) Determine the machining allowance of each process, calculate the process size and tolerance.

6) Determine the equipment and tools, fixtures, measuring tools and auxiliary tools used in each process.

7) Determine cutting parameters and man hour quota.

8) Determine the technical requirements and inspection methods of each main process.

9) Fill in process documents.

In the process of working out the process, it is often necessary to adjust the contents that have been initially determined before in order to improve the economic benefits. Computer gong processing, Dongguan high-speed computer gong processing, Dongguan mold processing, Dongguan Mechanical parts processing, CNC processing, in the process of implementing the process specification, there may be unexpected situations, such as the change of production conditions, the introduction of new technology and new technology, the application of new materials and advanced equipment, which require timely revision and improvement of the process specification.

The technological process of machining includes, generally speaking, the process of changing the overall dimension and performance of the workpiece through a kind of mechanical equipment.

The working principle of machining process regulation is high quality, high yield and low cost, that is, under the premise of ensuring product quality, labor productivity can be improved and cost can be reduced as much as possible. What problems should be paid attention to in the process planning? Here’s a look:

1., the advanced technology.

In the formulation of machining process procedures, computer gong processing, Dongguan high-speed computer gong processing, Dongguan mold processing, Dongguan Mechanical parts processing, CNC processing should make full use of the existing production conditions of the enterprise, as far as possible, use domestic and foreign advanced technology and experience, and ensure good working conditions.

2. Economic rationality

Under the specified production program and production batch, there may be several process schemes that can meet the technical requirements of parts. At this time, the process cost is generally required to be the lowest through accounting or comparison with each other. Make full use of the existing production conditions, spend less and do more.

Cutting conditions of CNC machining

The three elements of cutting conditions: cutting speed, feed and cutting depth directly cause damage. With the increase of cutting speed, the point temperature will rise, resulting in mechanical, chemical and thermal wear. If the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2.

Back feed conditions and tool wear are kept to a minimum. But feeding behind, cutting temperature rise, wear. Computer gong processing, Dongguan computer gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing, it is less than the impact of cutting speed. Cutting depth has no effect on cutting speed and feed, small cutting depth, but cutting material in hardened layer will also affect tool life.

According to the user’s processing material, hardness, cutting conditions, material selection, feed and cutting depth, the cutting speed is used.

Based on the selection of the most suitable process conditions, these factors are selected. Regular life and stable wear are the most ideal conditions.

However, in practice, the selection of tool life and tool wear, through machining size, surface quality, noise reduction, heat and so on. Under certain processing conditions, it is necessary to study according to the actual situation. Difficult to machine materials such as stainless steel, heat-resistant alloy, can use coolant or choose a good rigid blade.

Reasonable selection of cutting tools

1。 Rough rotation, should choose high strength, good durability knife, in order to meet the large car turning, feedback.

2。 The essence of automobile is to select high precision, durable and good cutting tools to ensure the machining accuracy.

3。 Reduce the conversion time and knife convenience, should try to use machine knife and machine clip blade.

Select fixture

1。 Choose general fixture to clamp workpiece as much as possible, avoid using special fixture; computer gong processing | Dongguan computer gong processing | Shenzhen computer gong processing | mechanical parts processing | Guangzhou computer gong processing

2。 The coincidence of parts positioning datum reduces the positioning error.

Determine the processing route

Machining path is the part of tool path and direction relative to each other in the process of exponential control.

1。 It should be able to meet the requirements of machining accuracy and surface roughness;

2。 Shorten the processing route as far as possible and reduce the idle travel time of the tool.

Heat treatment process of CNC machining metal

According to the different heating medium, heating temperature and cooling method, each category can be divided into several different heat treatment processes. The same metal with different heat treatment process can obtain different microstructure and different properties. Computer gong processing | Dongguan computer gong processing | Shenzhen computer gong processing | mechanical parts processing | Guangzhou computer gong processing

Steel is the most widely used metal in industry, and the microstructure of steel is also the most complex. Therefore, there are many kinds of heat treatment processes for steel.

Integral heat treatment is a metal heat treatment process that heats the workpiece as a whole and then cools it at a proper speed to change its overall mechanical properties. There are four basic processes of heat treatment of iron and steel: annealing, normalizing, quenching and tempering.

Annealing is to heat the workpiece to the appropriate temperature, adopt different holding time according to the material and size of the workpiece, and then cool it slowly. The purpose is to make the internal structure of the metal reach or close to the equilibrium state, and obtain good process performance and performance. Computer gong processing, Dongguan computer Gong processing, Shenzhen computer gong processing, mechanical parts processing, Guangzhou computer gong processing

Or to prepare for further quenching. Normalizing is to heat the workpiece to a suitable temperature and then cool it in air. The effect of normalizing is similar to that of annealing, but the microstructure is finer. It is often used to improve the cutting performance of low-carbon materials, and sometimes used as the final heat treatment for some parts with low requirements.

Quenching is the rapid cooling of the workpiece in water, oil or other inorganic salt, organic water solution and other quenching media after heating and holding. After quenching, the steel parts become hard but brittle at the same time. In order to reduce the brittleness of steel parts, the quenched steel parts are kept at a proper temperature higher than room temperature but lower than 650 ℃ for a long time, and then cooled. This process is called tempering. Annealing, normalizing, quenching and tempering are the “four fires” in the whole heat treatment. Quenching and tempering are closely related and often used together.

With the different heating temperature and cooling methods, different heat treatment processes have evolved. In order to obtain certain strength and toughness, quenching and high temperature tempering process is called quenching and tempering. Computer gong processing | Dongguan computer gong processing | Shenzhen computer gong processing | mechanical parts processing | Guangzhou computer gong processing

Some alloys are quenched to form supersaturated solid solutions, which are kept at room temperature or a little higher temperature for a long time to improve the hardness, strength or electrical magnetism of the alloys.

Injection molding process of CNC machining mold

After the injection molding, the film and plastic are integrated. The wear-resistant material is on the outside. This process is often used in the mobile phone display screen. Dongguan computer gong Processing Factory Dongguan machine parts Processing Factory Dongguan mold processing factory Shenzhen computer gong processing plastic materials are mainly PC, PMMA, PBT, etc., which mainly have the function of wear resistance and scratch resistance. There is also a technology called IML (in-mold-lable), which is roughly the same as IMD, except that flim is pulled out like a punched tape after injection molding, which just transfers the printed pattern to the plastic parts, also known as in mold transfer.

There are two main types of IMD. One is PC and single chip. The other is pet, chain like (like film or printed instant noodle pockets).

The former finished product is merge PC chip, the latter only takes the ink on the pet chain, but PET material (chain, also known as foil) is not imported into parts by merge.

For example, the front shield of Motorola v66 is very delicate,

The latter because of the thin pet, can be offset printing, very fine, especially electroplating and transparent, metal and surface fine texture are very good, such as Motorola V60 pre plating and black texture effect.

For example, the control panel on Matsushita rice cooker mold is a typical IMD, which puts a silk screen printed PET film into the injection mold for injection molding. The materials are PC, transparent ABS and PMMA. After injection molding, the film and plastic are combined into one.

Nowadays, most of the outer screen lenses of mobile phones adopt IMD technology, and the cost is correspondingly increased. The requirements of mobile phone molds, especially transparent molds, are more stringent.

Generally speaking, there are two background reasons for using IMD,

1. Some effects of injection molding are difficult to simulate, such as the walnut automobile dashboard (car parts mold).

2. It is very difficult to integrate several effects on small pieces of parts. Dongguan computer gong Processing Factory Dongguan Mechanical Parts Processing Factory Dongguan mold processing factory Shenzhen computer gong processing, such as the front triangle of moto V60 mold, concentrates electroplating, transparent, screen printing, but it also requires exquisite. Imagine using real electroplating, transparent pieces are injected separately and then splicing is very difficult.

Another method is to make the outer surface smooth and the inner surface rough, but there are some requirements for the mold.

CNC machining blank surface or rough machining steps

When machining the surface of blank or rough machining hole, the end milling cutter or corn milling cutter inlaid with cemented carbide can be selected for strong cutting.

The end mill C is often used when machining the peripheral contour of a plane workpiece.

In order to improve the accuracy of the groove width and reduce the number of tool changes, the milling cutter with a diameter of 7 than the groove width can be used to mill the middle part of the groove first, and then use the tool radius compensation function to mill the two sides of the groove.

Ball end milling cutter, ring milling cutter, drum milling cutter, cone milling cutter and disc milling cutter are often used in machining solid curved surface or variable bevel profile.

When the machining allowance is small and the requirement of surface roughness is high, the face milling cutter with cubic boron nitride blade or ceramic insert blade can be selected for high-speed cutting.

According to the principle of NC machining, the overall consideration is made according to the requirements of workpiece processing drawings, and the format specified by CNC milling machine is used for editing. Computer gong processing, Dongguan high-speed computer gong processing, Dongguan mold processing, Dongguan Mechanical parts processing and CNC machining are input according to the action sequence. Thus, we can know the precise machining technology of CNC lathe while compiling the NC program It is also necessary.

1. Determine the process flow. The processing technology of CNC milling machine is very similar to that of ordinary machine tool. Through analyzing the workpiece, specify the processing route, select the processing procedure, select the machine tool, fixture and cutter. Determine the equipment baseline position and cutting amount. The difference is that CNC machine tools need to program the operation process.

2. Calculate the tool coordinate value. In order to facilitate the programming and calculation of tool path coordinates. The coordinates of the workpiece and the size and shape of the part must be calculated first, so as to determine the whole machining path of the tool.

3. Write processing program, for simple workpiece can be written manually, but for complex processing workpiece, automatic programming is needed.

4. There are many ways to input program into CNC system, such as computer gong processing, Dongguan high-speed computer gong processing, Dongguan mold processing, Dongguan Mechanical parts processing, CNC processing, which are mainly completed by the operation panel of the CNC control system, and the interface between the computer and the CNC system can be connected to input the program through the computer.

5. Comprehensive inspection of procedures. Through the function of graph magic shadow display or NC milling machine equipment running without load, the machine tool running track can be checked, whether the tool movement meets the requirements of capping, or the method of single step program execution can be used for cutting

CNC machining thin wall mold processing

In a broad sense, it refers to the process that all products can be manufactured by mechanical means; in a narrow sense, it refers to the process of making parts by special machinery such as the lathe, milling machine, drilling machine, grinding machine, stamping machine, die-casting machine, etc.

There will be some errors in machining. Let’s talk about the original error related to the initial state of the process system itself

① Principle error is the error of machining method.

② Geometric error of process system

The relative position errors between workpiece and tool exist in static state, such as manufacturing error of tool and fixture, adjustment error and installation error;

The relative position error of workpiece and cutter exists in the motion state, such as the spindle rotation error of machine tool, the guide error of guide rail, the transmission error of transmission chain, etc.

The deformation caused by the force effect of the process system, such as the deformation caused by the stress deformation of the process system and the deformation caused by the generation and disappearance of the internal stress of the workpiece.

② Deformation caused by thermal effect of process system, such as the error caused by thermal deformation of machine tool, cutting tool and workpiece. In the machining process of Dongguan machine parts, when the position relationship between the tool and the workpiece processing surface is reasonable, the machining surface accuracy can meet the processing requirements, otherwise it can not meet the processing requirements. CNC machining accuracy analysis is to analyze and study various factors when the machining accuracy can not meet the requirements, that is, the possibility of various original errors, and take effective measures In order to improve the machining accuracy.