Changxin Machinery Manufacturing Co., Ltd.

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How is the processing of precision mechanical parts carried out?

Today we share with you the processing stages of precision mechanical parts: Precision part processing is impossible to complete all the processing contents of all surfaces in one process. The whole processing process of precision part processing can be divided into the following stages: (1) Roughing stage. Excavate most of the machining allowance for each machined surface and machine the fine reference, mainly considering increasing the productivity as much as possible. (2) Semi-finishing stage. Defects that may occur after roughing, in preparation for surface finishing, require a certain degree of machining accuracy, ensure proper finishing allowance, and complete secondary surface processing. (3) Finishing stage. At this stage, the large cutting speed, small feed rate and depth of cut are used to cut off the finishing allowance left by the previous process, so that the surface of the part can meet the technical requirements of the pattern. (4) Finishing stage. It is mainly used to reduce the surface roughness value or strengthen the machined surface, and is mainly used for surface processing with high surface roughness (ra≤0.32 μm). (5) Ultra-precision machining stage. The processing precision is 0.1-0.01 μm, and the surface roughness value is ra≤0.001 μm. The main processing methods are: precision cutting, fine mirror grinding, precision grinding and polishing.

2024-03-18

The difference between CNC machining and traditional machining process

The CNC machining process is derived from the conventional machining process and is an organic combination of conventional machining technology, computer numerical control technology, computer aided design and auxiliary manufacturing technology. Due to the continuous development of technology, more and more parts need precision machining in modern manufacturing, and the processing precision and the complexity of the workpiece surface are becoming higher and higher. Therefore, CNC machining has received extensive attention, but in terms of cost savings, CNC machining is still more expensive than traditional machining. Below we will introduce the difference between CNC machining and traditional machining process. 1, processing technology In the ordinary machining process, whether it is positioning reference, clamping method, tool, cutting method, etc. can be simplified, but the data processing process is more complicated, and these factors need to be fully considered, and even the same processing Tasks, CNC machining technology can have multiple solutions, can process multiple processing parts and processing tools as the main line, the process has diversified characteristics, which is the difference between CNC machining process and traditional machining process. 2, clamping and fixture In the CNC machining process, not only the coordinate direction of the fixture and the machine tool is required to be relatively fixed, but also the dimensional relationship between the part and the machine coordinate system is coordinated. Moreover, the two steps of positioning and clamping need to be effectively controlled during the clamping process. Moreover, under the traditional machining process, since the machining capability of the machine tool itself is limited, it is necessary to perform multiple clamping during the machining process. Moreover, it is necessary to use a special jig, which results in a high cost of design and manufacture of the jig, which inevitably increases the production cost of the product. The positioning of the CNC machining process can be debugged by the instrument. In most cases, the design of the special fixture is not required, so the cost is relatively low. 3, the tool During the machining process, the selection of the tool needs to be determined according to the processing technology and the processing method. Especially in CNC machining, the use of high-speed cutting is not only conducive to the improvement of machining efficiency, but also the processing quality can be guaranteed, effectively reducing the probability of cutting deformation, shortening the machining cycle, so the demand for cutting tools is further increased under the guidance of cutting. . There is also a dry cutting method which cuts without cutting fluid or with a small amount of cutting fluid, so the tool needs to have good heat resistance. Compared with the ordinary machining process, the numerical control machining process has high requirements on the performance of the tool.

2024-03-18

The cause of abnormal machining accuracy caused by CNC machine tools

CNC machining masters often encounter abnormalities in the accuracy of workpiece machining during work, but they do not know where the problem is, which not only causes unnecessary losses, but also greatly affects the processing of subsequent work, increasing the time cost. . Faced with such confusion, let's analyze the reasons for the abnormal processing accuracy. First, the formation of processing accuracy is the cause of abnormal problems The reason for the abnormal processing accuracy is often concealed, the diagnosis is difficult, and the troubleshooting is difficult. It is usually caused by the following five main reasons: the zero offset of the machine axes is abnormal; the machine feed unit is changed or changed; the motor Abnormal operation, that is, electrical and control parts are abnormal; axial reverse gap is abnormal; mechanical problems, such as lead screws, bearings, couplings and other components. In addition, the selection of tools, the preparation of machining procedures and human factors may also lead to abnormal machining accuracy. Second, the CNC machine tool diagnosis criteria 1. External external interior CNC machine tools are mechanical, hydraulic, and electrical machines, so the onset of the disease will be reflected by these three. The repair personnel should first check from the outside to the inside one by one, try to prevent the unsealing and unpacking as much as possible, otherwise it will expand the fault and make the machine lose precision and reduce the function. 2. First mechanical and electrical In general, mechanical problems are easier to detect, and the diagnosis of CNC systems is more difficult. Before the fault is repaired, it is necessary to first check the mechanical problems in advance, which can often achieve twice the result with half the effort. 3. After quietly moving Firstly, after the machine is powered off, the machine can be energized by understanding, investigating, testing, and analyzing the non-destructive problem. Under the operating conditions, conduct dynamic investigation, inspection and testing to find faults. . For destructive problems, the machine must be powered off before the risk can be removed. 4. Simple and messy first When a variety of problems are intertwined and obscured, when it is impossible to start, it is necessary to deal with simple problems and post-processing difficult problems. Often, after a simple problem is dealt with, the difficult problem will be solved. Third, the CNC machine tool diagnosis method 1. Intuitive method: (Wang Wen asked) Ask - the machine tool's fault phenomenon, processing status, etc.; see - CRT alarm information, alarm indicator, capacitor and other components deformation smoke and burn, protector trip, etc.; listen - abnormal movement; - Electrical components burnt and other odors; touch-oscillation, heat, poor contact, etc. 2. Parameter viewing method: The parameters are usually stored in RAM. Sometimes the battery voltage is insufficient. If the system is not energized or externally interfered for a long time, the parameters will be lost or disordered. The relevant parameters should be viewed and corrected according to the fault characteristics. 3. Isolation method: Some problems are difficult to distinguish between the numerical control part and the servo system or mechanical part. The isolation method is often used. 4. The same type of adjustment method replaces the template that is suspected of being faulty with the same standby board, or exchanges the same template or unit. 5. The utility program test method writes some small programs for the G, M, S, T, and the full instructions of the function. When these problems are diagnosed when the diagnosis is diagnosed, the missing function can be discriminated.

2024-03-18

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