Application Of CNC Special Processing In Mold Manufacturing
CNC special processing technology is formed by multi-disciplinary integration, including computer technology, measurement technology, modern mechanical manufacturing technology, automation control technology and microelectronic technology. Through the integration of these disciplines, the original manual operation will be transformed. For electronic control, it is truly mechanized, which in turn provides the manufacturing and manufacturing efficiency and efficiency of the entire manufacturing industry. In order to realize the effective application of CNC special processing technology in mold manufacturing, the following points need to be achieved.
1. Choose the right CNC machine tool
The core device of CNC machine tools is composed of hardware devices such as printed circuit boards, tape readers, CRT monitors and various software. The hardware devices can be controlled by software programs to realize data changes, interpolation operations, etc. Very high precision and stability compared to conventional machine tools.
There are many types of CNC machine tools. In the process of mold processing, suitable CNC machine tools should be selected according to the different properties of the products. Only a reasonable choice of CNC machine tools can effectively reduce production costs in line with production requirements. For example, rotating molds such as car holes, car planes, wine bottles, wine glasses, etc. usually use CNC turning, and for molds with complex shapes and contours such as die-casting molds and injection molds, EDM can be selected. And CNC milling is used. At the same time, when the inside of the mold is drilled or the inner cavity is beautified, CNC electric spark forming can be used. For the curved mold with high precision, CNC grinding can be used.
2. Improve production efficiency through optimization procedures
First of all, in the NC machining process, adjustment of the process program cannot be absolutely accurate, and an adjustment error will occur. Then the cause of machine tool error is mainly machine tool manufacturing error, installation error and wear. The main reasons are: manufacturing error of positioning component, tool guiding component, indexing mechanism, clip concrete, etc.; after assembling the fixture, the above various component working faces Relative dimensional error between the two; the error caused by the wear of the working surface of the fixture during use.
Secondly, due to the deformation of the force and the overheating of the program system, the deformation may cause errors, which affects the dimensional accuracy and production efficiency of the mold.
Among the CNC special processing technologies, CNC programming technology is one of the most important technologies, and his level has a very close relationship with programming skills. Therefore, programmers are required to carefully control the machining time, program and quality when programming CNC programming technology to reduce various error problems that may occur during the machining process. At the same time, in the setting of programming technology instructions, try to Reduce non-cutting time to increase the productivity of mold manufacturing. For example, it is possible to properly compress the time when the start and stop transfer is fast moving, the positioning is coincident, and the like, so as to save time and improve work efficiency.
3. Reasonable improvement of processing technology
First of all, under the conditions of market competition, the development of CNC special processing technology should conform to the requirements of mold development. Therefore, CNC special processing technology needs to pay attention to technology development and improve processing technology to improve the quality of mold processing.
Secondly, the main factors affecting the accuracy of CNC vehicles are as follows.
(1) The installation level of the CNC machine tool directly or indirectly affects the size of the workpiece;
(2) The tightness of the connecting screws between the electric turret and the middle pallet directly affects the quality of the machining accuracy;
(3) The tightness of the spindle lock nut directly or indirectly affects the ellipticity of the workpiece;
(4) The precision of repeated positioning of the electric turret can directly affect the quality of the precision of the workpiece. It should be periodically disassembled and related cleaning and maintenance measures;
(5) The tightness of the nut at the connection position between the XZ-axis screw and the middle pallet directly affects the processing precision;
(6) If the lock nut of the XZ-axis screw is loosened due to its looseness, it will also affect the density of the part.
In general, in order to further ensure the machining accuracy in the machining of CNC shaft parts, it is necessary to effectively screen the tool materials, ensure the cutting amount and the geometric parameters of the tool, make full use of the cooling lubrication, and prepare the knife grinding to reduce the wear. Improve and optimize the performance of the material to promote the increase of the rigidity of the tool, and then it is necessary to properly clamp the workpiece to avoid deformation of the workpiece.
In addition, the control and grasp of the length, diameter and machining accuracy of the CNC shaft parts should also pay attention to two major points: on the one hand, control and grasp the length dimension of the CNC shaft parts, whether it is a rough turning tool or a precision turning tool, it must have a uniform end face. Especially for fine turning knives, if you want to carry out mass production, you should also find a suitable positioning point; on the other hand, control and grasp the diameter of the CNC shaft parts, and the same rough turning knives and precision turning knives must be flushed. In order to accurately measure the size of the parts, we must use the “secondary finishing car”. When finishing the machining, we must pay special attention to the difference between the roughing knife and the finishing knife. When measuring, we must adhere to the principle of accuracy and accuracy, and at the time of inspection. It is necessary to ensure that the “first inspection”, “mutual inspection” and “final inspection” and “three inspections” guidelines are in place.