陶瓷结合剂金刚石砂轮修整的研究(Ⅲ)——杯形砂轮修整器的修整机理

在前两篇文章中,笔者提出了一种以杯形砂轮为工具的金刚石砂轮修整方法。本文探讨了以该方法修整陶瓷结合剂金刚石砂轮的机理。主要结论如下:(1)杯形砂轮的修整作用主要取决于从GC砂轮上脱落下来的磨粒对金刚石磨粒和结合剂桥的冲击。(2)杯形砂轮越软,其上脱落下来的磨粒越大,修整效率越高,但金刚石砂轮表面越粗糙。(3)用烧结体多点金刚石笔修整时,从最外表面开始,金刚石砂轮表层磨粒依次被金刚石笔削去。(4)作为添加材料加入到陶瓷结合剂金刚石砂轮中的碳化硅磨粒,其顶端在磨削初期即被磨平。(5)磨削难磨材料时,最好使用无添加材料的陶瓷结合剂金刚石砂轮。

Studies on the Truing and Dressing of Diamond Wheels-Truing Principles of GC cup Truer

In the previous papers a new truing technique with a cup-truer was proposed for thepreparation of diamond wheels. This paper describes the truing mechanism of diamond vitrified grind-ing wheels. The main results obtained are as follows: (1 ) The effect of truing with a cup --truer main-ly depends on the impact of silicon carbide grains torn off from the truer against diamond abrasives andbond bridges. (2) The softer a cup --truer is, the larger grains will be torn off from the truer, leadingto a higher truing rate and a rougher surface texture of the diamond wheel. (3) In truing with an im-pregnated diamond tool, which has almost no grains to be torn off, the grains sticking out most on thegrinding wheel are removed in order, (4 ) In the early stage of grinding process, the protruding grainsof silicon carbide filled as a filler in the vitrified bond are rapidly flattened. (5)For difficult-to-grindmaterials it is desirabla to use a diamond vitrified wheel without filler.