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在块规修理中,为了获得很高的光洁度,必须对压砂平板进行打磨。打磨得好坏,直接影响块规光洁度。到目前为止一般的打磨工具都是采用天然油石或玛瑙石。而此二种材料又都能用金刚砂研磨动。所以非但不容易打磨掉金刚砂尖锐棱角,反而磨损打磨工具,或动摇平板表面的砂粒。甚至使砂粒脱离铸铁基体划伤块规。这样使得要提高光洁度就较为困难。我曾用硬质合金作为打磨平板的工具,感到很容易提高光洁度,一直用到现在。硬质合金之所以比天然油石和玛瑙石优异,可能有下列因素,不一定对,供同志们参考:
In the block repair, in order to obtain a high finish, you must sanding the sand flat. Grinding is good or bad, a direct impact on block smoothness. So far the general grinding tools are made of natural whetstone or agate stone. And these two kinds of materials can use diamond grinding. Therefore, not only is it not easy to polish the sharp edge of diamond, but wear and tear tool, or shake the surface of the sand tablet. Even the sand from the cast iron matrix scratch block rules. This makes it harder to improve finish. I used cemented carbide as a tool to polish the plate, feel it easy to improve the finish, has been used until now. The reason why cemented carbide is better than natural whetstone and agate stone may have the following factors, which are not necessarily correct for the comrades to refer to: