Purpose

Mechanical wear is the main wear form of abrasive single crystal diamond (SCD) grit. The mechanical wear of SCD grit has a significant influence on the tool life and machining quality. This paper aims to investigate the influence of grit–workpiece contact form on the mechanical wear characteristics of SCD grit.

Design/methodology/approach

Three different grit–workpiece contact forms, which involved point/line/face contact forms, are investigated to reveal the wear mechanism of SCD grit scratching on Ta12W. The wear morphology, wear volume and scratching forces are measured, and the stress models of different contact forms are analyzed.

Findings

The results show that mechanical wear mainly occurs in the grit–workpiece contact area and increases gradually from contact area to entire SCD grit. The scratching forces vary with the mechanical wear progress of SCD grits. The SCD grit with point contact form is the most prone to produce wear. The SCD grit with face contact form can remove more material volume than the other two SCD grits, and it is the most wear resistant. The stress state is closely related with the mechanical wear of SCD grit. The contact form has a significant influence on the mechanical wear of SCD grit.

Originality/value

The results of this study can provide a theoretical basis for the fabrication of abrasive tools.

中文翻译：

---

接触形式对Ta12W上单金刚石划痕机械磨损特性的影响

目的

机械磨损是磨料单晶金刚石（SCD）砂砾的主要磨损形式。SCD砂粒的机械磨损对刀具寿命和加工质量有重要影响。本文旨在研究砂粒与工件的接触形式对SCD砂粒机械磨损特性的影响。

设计/方法/方法

研究了涉及点/线/面接触形式的三种不同的砂粒-工件接触形式，以揭示SCD砂粒在Ta12W上刮擦的磨损机理。测量了磨损形态，磨损量和刮擦力，并分析了不同接触形式的应力模型。

发现

结果表明，机械磨损主要发生在砂粒与工件的接触区域，并从接触区域到整个SCD砂粒逐渐增加。刮擦力随SCD砂粒的机械磨损进度而变化。点接触形式的SCD砂粒最容易产生磨损。带有面部接触形式的SCD砂粒比其他两个SCD砂粒可以去除更多的物料，并且是最耐磨的。应力状态与SCD砂粒的机械磨损密切相关。接触形式对SCD砂粒的机械磨损有重大影响。

创意/价值

研究结果可为磨具的制造提供理论依据。