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Solution to the roughening problem of copper precision parts

Classification:Company News Release time:2021-09-09 30

For copper precision parts with high requirements for surface quality and shape accuracy, grinding should be carried out according to the precision machining process in order to meet the quality requirements. However, it is impossible to copy the processing technology of ordinary parts, which can not only solve the problem of grinding debris blocking the grinding wheel, but also cause galling and scratch on the surface of precision parts, resulting in the reduction of precision machining quality. For workpieces, galling is the main reason affecting the machining quality, Removing the roughening on the workpiece surface is the main process problem to be solved in the processing of copper precision mechanical parts.

Copper material itself is relatively soft. When machining precision mechanical parts with this material, the hardness can be improved by heat treatment, but its cutting performance is still poor. Because the grinding debris blocks the air hole of the grinding wheel during the grinding of copper precision parts, the grinding method is generally not used for machining copper precision mechanical parts, and the diamond turning (boring) method can be used, The shape accuracy and surface quality of precision parts obtained by tool tip trajectory are affected by cutting principle. It is difficult to meet the technical requirements for precision parts with high machining accuracy.

What is grooming? The deep scratches with uniform direction and uneven distribution on the workpiece surface are called roughening. The roughness of the workpiece surface increases after roughening, which affects the cooperative use of precision parts. How to solve the roughening problem is also the top priority to solve the precision machining of copper parts.

In order to solve the roughening problem of workpiece, we should start with how to avoid hard particles from entering the grinding area. In order to avoid hard particles from entering the grinding area and ensure the surface quality of workpiece, we should improve from the following aspects:

1. Selecting the grinding wheel with coarse particle size can make the micro edge of the grinding particle more and sharp and easy to cut, so as to reduce the grinding force of the grinding wheel on the machining of precision mechanical parts.

2. The wheel with relatively loose structure is selected. The wheel has loose structure and large air holes between abrasive particles, which can store more coolant to prevent abrasive debris from blocking the wheel, and has good heat dissipation performance at the same time.

3. Select the grinding wheel with moderate hardness. The hardness of the grinding wheel refers to the difficulty of abrasive particles falling off under the action of external force. Machining copper parts with the grinding wheel with moderate hardness can prevent the abrasive particles from falling off during grinding.

4. Appropriately increase the flow of coolant to make it have a good cleaning effect on the grinding wheel, prevent chips from blocking the pores of the grinding wheel and washing away sundries, enhance the cooling effect, timely take away the cutting heat received by the workpiece and ensure the stability of the workpiece size.