熱軟化による硬度管理可能な研磨工具を用いた軟質材料の鏡面加工

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The polishing process is one of the traditional finishing process for improvement of geometrical tolerance and surface roughness. Most of polishing processes are conducted by skilled worker as a manual process at present. The productivity of this process is very lower than other mechanized processes and is difficult to be controlled. An automated polishing system and optimized slurry for this system were developed from these reasons. In the case of the polishing to soft material such as plastics, variation of the grain size and the shape strongly effect to finished surface roughness. Hence, many scratches are easily occurred on the surface of the workpiece. We focused on the relationship of the Vickers hardness between workpiece and the polishing head for the machining of them. When the Vickers hardness of the tool head takes less than 20% of the workpiece, the finished surface roughness become good because of uniform cutting depth of grains on the workpiece. A polishing tool which can control the hardness of the head surface by heat softening was developed. The thermoplastic resin is used as material of the head and optimum polishing pressure was cleared. Several soft materials were machined as 0.16μmRz using the developed tool. It is concluded from the result that; (1)The suitable hardness of the tool head is less than 20% of the workpiece for uniform cutting depth of the grains. (2)A new polishing tool with controllable its surface hardness was developed. (3)By the developed tool, soft materials can be finished as mirror-like surface.

熱軟化による硬度管理可能な研磨工具を用いた軟質材料の鏡面加工

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