The shells are mainly used in medical cases, reducers, etc., all of which require surface treatment. On various processing surfaces, the precision of CNC machining in plane processing is easier to guarantee than the precision of hole machining. Therefore, the CNC machining accuracy of the spindle bearing hole (main hole) and the CNC machining accuracy of the box hole system are key issues in this process. For example, aluminum alloy car chassis. Good heat dissipation, high adhesion to CNC processing, four-star overlay, easy maintenance, anodized surface, five-star overlay. Disadvantages: high processing standards, relatively high costs, and difficulty in personalized style design. Wooden frames have poor heat dissipation and high-end logs are expensive. The following is a detailed introduction to the processing cases of inclined reduction box.
Several aspects must be taken into account when planning process technology.
(1) Process from surface layer to hole processing
If you process the plane from the beginning, you can not only remove the rough surface layers, but also easily draw the holes distributed in the plane to align the two ends. In addition, if the punching CNC blade is used to punch holes slowly, there will be no impact vibration or damage to the CNC blade due to uneven ports. Therefore, the floor plan should generally be addressed first.
(2) Divided into rough machining and processing links
The structure of the box is complex, and the main requirements for surface accuracy are strict. Cutting speed, clamping force and cutting heat generated during rough machining impact the precision of CNC machining. If rough machining is carried out immediately, the workpiece deformation stress caused by various reasons after rough machining cannot be fully released and cannot be eliminated during the processing process, so the shell will deform after being discharged, affecting the final precision of CNC machining of the shell. It is hoped that during the rough machining process, the tooling device can be loosened several times to release the thermal stress as soon as possible, thereby greatly guaranteeing the processing quality of the shell.
(3) Determining centralized or fragmented processes
The separation of the hull roughing and machining steps meets the requirements of a fragmented process. However, in order to reduce the number of CNC lathes and tooling fixtures used in small and medium batches and reduce the transportation and case installation time, the roughing and processing links can be relatively centralized and equipped on the same tour as much as possible. possible.
(4) Assign appropriate heat treatment methods
The structure of the forging box is complicated, the thickness is uneven, the cooling speed during forging is inconsistent, it is easy to produce thermal stress, and the surface layer is hard. Therefore, the sandblasting and quenching personnel must be scientifically organized after forging.
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