金属结合剂强度和微形变对薄壁工程钻性能的影响(下)

Influence of Strength and Micro-deformation of Metallic Bond on the Performance of Diamond Core Drill Bit

业内以烧结致密度、硬度和抗弯强度对金属基金刚石工具的工艺性予以表征,这种"静态"指标评价方式简易但不精准,尤其是对工具的使用性能设计无指导意义。作者尝试在薄壁工程钻上以抗弯载荷-挠度这一"动态"指标,模拟实际工况中工具的金属结合剂受力行为,辅以电镜形貌检测,寻求一种不必进行钻切试验即可量化评价工具工艺与使用性能的方法。文章重点研究了Co单质及Co60Fe30Ni10、Co50Fe30Cu10Ni10雾化预合金粉三种结合剂随烧结温度的不同其抗弯载荷-挠度曲线产生的变化,对在实际工况中的薄壁工程钻受力行为进行分析,推导出金属结合剂强度和挠度公式,并通过钻切试验对其进行验证。

The sintered density,hardness,and bending resistance are adopted to evaluate the technological properties of metal matrix diamond tools in the industry.This type of ＂static state＂ evaluation method is simple but inaccurate.There is no guiding significance for the operation performance design of the tools.The author has been trying to develop a quantification assessment method for the technological properties and operation performance of the tools without drilling test by using bending load-deflection as a ＂ dynamic state＂ index to simulate the mechanics behaviors of the metallic bond of the tools in ctual working condition,supplemented by TEM topography measurement.The variation of bending load-deflection curves of three types of bonds（Co elementary substance,Co60Fe30Ni10 and Co50Fe30Cu10Ni10atomized pre-alloy powders）under diffrent sintering temperature have been mainly studied in this artical.The strength and deflection formula has been derived by analyzing the mechanics behaviors of the diamond core drill bit in ctual working condition and has been tested through drilling test.