多刃PCD刀具的焊接实验研究
2018-12-20
作者：方宇，董海，王磊，朱袁琦
单位：大连理工大学
摘要：在单刃PCD刀具的焊接工艺基础上，采用辅助散热装置，利用高频感应钎焊实现多刃PCD刀具的焊接。试验借助扫描电镜(SEM)、电子探针对焊缝显微组织和元素分布进行分析，研究二次加热对多刃PCD刀具钎焊质量的影响。结果表明：采用辅助散热装置后的二次加热过程加剧了焊缝中钎料的流动性，使焊缝边界处的钎料融合更加充分，焊缝结合更加紧密。利用电子探针对焊缝具体元素进行分析可知，二次加热加剧了Cu、Ni的互溶，使元素的分布更加均匀，焊缝边界处元素有向母材更深层次扩散的趋势。试验表明，采用辅助散热装置焊接的多刃PCD刀具尽管受到二次加热，但对刀具的钎焊质量并未产生太大影响，证明了该焊接方案的可行性。
关键词：多刃PCD刀具；高频感应钎焊；二次加热；钎焊质量
中图分类号：TG707; TH161文献标志码：A
Experimental Research on Welding of Multiedged PCD Cutting Tools
Fang Yu，Dong Hai，Wang Lei，Zhu Yuanqi
Abstract:Based on the welding process of singleedged PCD tool，the device of auxiliary heat dissipation is used to realize the welding of multiedged PCD tool by high frequency induction brazing.The micro structure and element distribution of welds are analyzed by scanning electron microscopy (SEM) and electron probes to explore the effect of reheating on the brazing quality of multiedged PCD tools.The result of test shows that reheating process with auxiliary cooling device intensifies the flow of solder in the weld，making the fusion of solder at the weld boundary more fully and the weld joints tighter.The electron probes is used to analyze the specific elements of the weld.The result shows that the miscibility of Cu and Ni intensifies after being reheated，making the distribution of elements more uniform，there is a tendency for the elements at the weld boundary to diffuse deeper into the base metal.The test shows that the reheatingwith the auxiliary cooling device has little effect on brazing quality of the multiedged PCD tool，which has proved the feasibility of the welding scheme.
Keywords:multiedged PCD tool；hifrequency induction brazing；reheating；brazing quality