Grinding process for processing precision mold parts

2021-03-23 14:58:58 admin

Grinding process for processing precision mold parts

  Mold accessories refer to the parts or components of the assembly mold; it can also refer to the mold parts or components that are reinstalled after damage. Precision molds are generally composed of many parts, which can be divided into two categories: process parts and structural parts. Process parts directly affect the quality of molded products. The decisive quality of process parts is completed by precision machining methods in the current precision mold parts. The precision machining process is related to the life of the precision mold and the molded product. In addition to the slow wire cutting, EDM and other technological methods, the other method used in the finishing stage of the precision mold parts is after the semi-finishing. Grinding processing based on heat treatment.

   So in the grinding process of precision mold parts processing, it is necessary to control many technical parameters such as deformation, internal stress, shape tolerance and dimensional accuracy of the parts. In the specific production practice, the operation is more difficult, but in Dongguan Shili and 15 years of precision machining experience, we can summarize and analyze the methods that can be used for reference: 1. From the precision machining process of the mold to control the precision mold parts processing, we It can adapt to different mold parts, different materials, different shapes and different technical requirements, and provide selective solutions. Through the control of the processing process, to achieve better processing results and economy is the focus of most precision mold parts processing enterprises. The process of precision mold parts processing is generally: rough machining-semi-finish machining-(quenching, quenching and tempering)-precision grinding-electrical machining-fitter finishing-assembly processing.

   There are three main types of machine tools used in the grinding process of precision mold parts processing: surface grinders, internal and external cylindrical grinders and tool forming grinding machines. When finishing grinding, it is necessary to strictly control the appearance of grinding deformation and grinding cracks, even if it is the micro cracks on the surface of the workpiece, otherwise it will gradually appear in the subsequent work. Therefore, the amount of feed in precision grinding should be small, the cooling should be sufficient during grinding, the coolant medium should be selected as much as possible, and the parts with a machining allowance within 0.01mm should be ground at a constant temperature as much as possible.

In the grinding process, the grinding wheel should be trimmed in time to keep the grinding wheel sharp. When the grinding wheel is passivated, it will rub, scratch, and squeeze on the surface of the workpiece, causing burns, micro cracks or grooves on the surface of the workpiece, which is significant for future use. To reduce utility. Most of the processing of disk and board parts are processed by surface grinders. When processing long and thin sheet parts, there is a certain degree of difficulty in processing. Before processing, under the strong attraction of the magnetic table of the grinder, the workpiece was originally bent to produce a straight deformation, which was close to the surface of the worktable. After grinding, the workpiece deformed and recovered under the original stress, and the thickness of the plate was measured. However, due to the deformation recovery, the flatness cannot meet the requirements of precision mold parts processing. The solution is to pad under the workpiece with a contour shim before grinding, and block the workpiece with stoppers around to prevent it from moving. The grinding head enters during grinding. The amount of knife should be small. Use multiple passes to complete the reference plane. After the reference plane is processed, this reference plane can be adsorbed on the magnetic table. The flatness of most workpieces can be improved by the grinding method described above.