金刚石工具金属结合剂的磨损特性

Wear characteristics of metal bond for diamond tools

文中通过试验和引用若干试验、锯切数据,着重对结合剂的耐磨性和硬度、结合剂的磨损特性和工具的磨损特性、与工具性能相关的主要物理性能进行了讨论。试验结果表明,在Fe基锯片中,P的加入对结合剂硬度没有明显影响却显著降低结合剂的耐磨性,对锯片寿命的影响为先增后降,在P含量为2%wt时寿命达到最大,比未加时提高58%,显著降低结合剂和锯齿的三点抗弯强度,提高锯片的切割速度。认为,结合剂硬度与耐磨性没有必然的联系;结合剂的适度磨损性能不意味着工具寿命的降低;不要过高的要求结合剂的抗弯强度,抗弯强度的底限是保证锯片工作时的绝对安全。

Experiment and field tests results obtained by the anthors as well as by other reseachers were cited to discuss the wear resistance and hardness of the bond, the wear characteristics of both the bond and the tool. The results showed that the adding of phosphorus to Fe - based bond has no obvious effect on the hardness of bond, but can decrease the bond wear resistance. The life span of the sawblade with 2% phosphorus added reached to maximum,namely being improved by 58% compared to those without phosphorus added. The addition of phosphorus decrease the flexural strength, but enhance the cutting speed of the sawblade. At last we conclude that： the hardness and wear resistance of the bond have no definite correlation, and moderate wearing of the bond does not mean the short lifespan of diamond tools. Last but not least, it is no need to over - expect the flexural strength, on the precondition that the flexural strength can guarantee the safety of the operation.