High-frequency-induction-heating ultrasonic-vibration-assisting preparing method of single-layer-diamond brazed grinding wheel

Abstract

The invention provides a high-frequency-induction-heating ultrasonic-vibration-assisting preparing method of a single-layer-diamond brazed grinding wheel. The preparing method includes the following steps that firstly, a grinding wheel base body and brazing filler metal are prepared; secondly, the brazing filler metal and diamond grinding particles are arranged; finally, high-frequency induction heating is assisted by ultrasonic waves to prepare the single-layer-diamond brazed grinding wheel in a brazed mode. Cu powder, Sn powder, Cr powder and Ni powder are mixed to prepare the Cu-based brazing filler metal with Cr as active elements, the proportion of the ingredients of the brazing filler metal is easy to control, and thin carbide layers are formed on the surfaces of the diamond grinding particles after brazing, and chemical metallurgical bonding of diamond and the steel base body is achieved. The preparing method is used for producing the grinding wheel and has the advantages that heat damage to the diamond grinding particles is small, and the preparing cost of the brazing filler metal is low. Due to assisting of the ultrasonic waves, even alloying of the elementary metal powder in the brazing process can be achieved, and the melting point of the brazing filler metal can be lowered.

Description

technical field [0001] The invention belongs to the field of diamond tool manufacture, in particular to the manufacturing technology of brazing single-layer diamond tools. Background technique [0002] At present, diamond tools are mostly used in the processing of hard and brittle materials. Among them, brazed single-layer diamond tools have excellent characteristics such as high bonding strength, high abrasive exposure, environmental protection, high abrasive effective utilization rate, and long service life. They have a wide range of applications. . In addition, the abrasive grains on the surface of the brazed tool are easier to achieve orderly arrangement, which greatly improves the efficiency of the tool. Therefore, brazed diamond tools are considered to be the best alternatives to plated tools. [0003] Brazing mostly uses Ni, Ag, Cu-based alloyed solder containing active elements (such as Cr, Ti, V, W). Alloyed solder has the advantages of uniform composition and low...

AI Technical Summary

Problems solved by technology

The brazing temperature of the brazing material is relatively high, and Ni is an element that promotes diamond graphitization, which has high strength and hardness. Therefore, the high temperature of the brazing process easily leads to diamond graphitization, and the residual stress of the diamond after welding is relatively large. Ultimately leading to greater thermal damage to the diamond

In addition, when this type of tool cuts and grinds hard and brittle materials such as granite, stone, and ceramics, the Ni-Cr-based solder wears slowly, which makes the tool passivate, that is, poor self-sharpening, which affects work efficiency

Therefore, if Cu-Sn-Ti active solder is used for brazing, it has the advantages of small thermal damage to diamond and easy real-time exposure of manufactured tool abrasive grains, but the solder has insufficient wear resistance when processing some hard and brittle materials efficiently.

Diamond abrasive brazing usually uses powdered solder, and the solder usually needs to contain certain active elements. Although the melting point of the alloyed solder is low, the melting process of the solder requires a high degree of vacuum, and the subsequent need to It is atomized in an inert atmosphere or vacuum to produce powdered solder. In addition, alloyed solder has the disadvantage of inconvenient regulation of Ti composition.