Grinding machine for rubbing

Abstract

The invention provides a grinding device for plate-like clipped material, which is characterized by even grinding and good pressure responsibility. The cylinder chip material (1) is equipped with porous elastic material (2), the outer of which is provided with grinding layer (4), and said porous elastic material is rubber sponge. The hardness of rubber sponge is 5-40 when test by rubber hardness gage C graduation, and the best elastic rate is 50-90%, while the best 25% compress loading value regulated by JIS K 6767 is 0.010- 0.200 Mpa.

Description

technical field [0001] The present invention relates to a grinding tool for grinding a plate-shaped workpiece, and more particularly relates to a grinding tool for grinding a metal plate or a non-metal plate, especially a printed circuit board. Background technique [0002] Conventionally, as a grinding tool for grinding a plate-shaped workpiece represented by a printed wiring board, there are known grinding tools disclosed in JP-A-2001-315054 and JP-A-2004-50400. [0003] Abrasives used for grinding plate-shaped workpieces, one example of the structure, as shown in Figure 1, is provided with a porous elastic body (2) on a cylindrical core material (1), and the porous elastic body A grinding layer (4) is provided on the outer periphery of the body (2) between the reinforcement layer (3). The material of the cylindrical member is, for example, a so-called phenolic tube made of paper tube impregnated with phenolic resin and reinforced, which is light, rigid and excellent, and...

AI Technical Summary

Problems solved by technology

[0009] However, there is a problem that sometimes unacceptable grinding unevenness can be observed on the surface to be ground of the workpiece ground with the existing grinding wheel.

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