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Precision mold parts are parts or components that assemble molds; It can also refer to mold parts or parts that have been reinstalled after damage. Precision molds are usually composed of many components and can be divided into two categories: process components and structural components. The process components directly affect the quality of molded products, and the quality of finished parts of the process is achieved through precision machining methods in current precision mold components. The precision machining process is related to the lifespan of precision molds and molded products. In the precision machining stage of precision mold parts, in addition to slow cutting EDM and other processes, another method is through semi precision machining. Grinding based on heat treatment.
Then, during the grinding process of precision mold parts, the deformation of the parts must be controlled. There are many technical parameters for internal stress, such as shape tolerance and dimensional accuracy. In specific production practice, the operation is relatively difficult, but in the experience of precision machining, methods can be summarized for reference:
By controlling the precision machining process of precision mold parts, we can provide adaptive solutions for different mold parts with different materials, shapes, and technical requirements. The focus of most precision mold parts processing enterprises is to achieve better processing efficiency and economy through the control of the processing process.
The machining process for precision mold parts generally includes: rough machining - semi precision machining - (quenching, quenching, tempering) - precision grinding - electrical machining - fitter trimming - assembly processing.
Three main types of machine tools are used in the grinding process of precision mold parts: surface grinding machines, internal and external cylindrical grinding machines, and tool forming grinding machines. In the case of precision grinding, it is necessary to strictly control the occurrence of grinding deformation and grinding cracks. Even micro cracks on the surface of the workpiece will gradually appear in subsequent work. Therefore, the cutting amount during the precision grinding process should be very small, and the cooling during the grinding process should be sufficient. Cooling medium should be chosen as much as possible. Parts with a machining allowance of 0.01 mm should be grounded as much as possible. During the grinding process, the grinding wheel should be repaired in a timely manner to keep it sharp. When the grinding wheel is passivated, it will rub and be cut off on the surface of the workpiece, causing micro cracks or grooves on the surface of the workpiece, which is of great significance for future use. Reduce utility. Most of the processing of circular plate parts is done by a surface grinder. When processing slender thin plates, there are certain processing difficulties. Before processing, under the strong attraction of the magnetic workbench of the grinding machine, the workpiece originally has a certain bending effect, resulting in linear deformation near the surface of the workbench. After grinding, the workpiece deforms and recovers under the original stress, and the thickness of the plate is consistent when measured. However, due to deformation recovery, the flatness does not meet the requirements for precision mold parts processing. The solution is to use shims of the same height under the workpiece before grinding and prevent the workpiece from moving with the block. The tool quantity is very small, and the reference plane is completed through multiple passes. After processing the reference plane on one side, the reference plane can be adsorbed on the magnetic table, and the flatness of most workpieces can be improved through the grinding method mentioned above.