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Evaluation of finished surface of cemented carbide by direct cutting using diamond-coated carbide end mill

机译：用金刚石涂层硬质合金立铣刀直接切削来评估硬质合金的精加工表面

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摘要

This study investigates the finished surface of cemented carbide obtained by direct cutting with a diamond-coated carbide end mill. Excellent cutting performance in the direct cutting of cemented carbide can be achieved using a diamond-coated carbide end mill under ultrasmall feed rates. The quality of the finished surface was primarily evaluated in terms of surface appearance, profile, and transverse rupture strength. The finished surfaces obtained by electric discharge machining and mechanical polishing were also evaluated to compare the surface quality. A WC-Co composite cemented carbide material (CIS VC-70) was used as the workpiece, and the transverse rupture strength test was conducted according to the CIS 026B. The finished surfaces obtained by direct cutting and mechanical polishing were shown as mirror surface. The size of the WC grain observed on the finished surface obtained by direct cutting was smaller than the mean grain size of the workpiece before the cutting process. Minute unevenness was conspicuous on the finished surface obtained by direct cutting when compared with that by mechanical polishing. The transverse rupture strength of the workpiece finished by direct cutting was the highest in the three types of processing method.
机译：这项研究研究了通过用金刚石涂层硬质合金立铣刀直接切割获得的硬质合金精加工表面。在超小进给速度下，使用金刚石涂层硬质合金立铣刀可以实现硬质合金直接切削中的出色切削性能。主要根据表面外观，轮廓和横向断裂强度评估成品表面的质量。还评估了通过放电加工和机械抛光获得的精加工表面，以比较表面质量。将WC-Co复合硬质合金材料（CIS VC-70）用作工件，并根据CIS 026B进行横向断裂强度测试。通过直接切割和机械抛光获得的精加工表面显示为镜面。在通过直接切削获得的精加工表面上观察到的WC晶粒的尺寸小于切削加工之前的工件的平均晶粒尺寸。与通过机械抛光相比，通过直接切割获得的最终表面上的微小不均匀性明显。在这三种加工方法中，通过直接切割完成的工件的横向断裂强度最高。

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