Novel technique for high-frequency heat treatment of lathe tool

Abstract

The invention relates to a novel technique for high-frequency heat treatment of a lathe tool. The technique comprises the following steps: (1) the lathe tool is placed into a chamber furnace for preheating, heat preservation is performed for 30 minutes at 580 DEG C in the first stage, and heat preservation is performed for 1-1.5 hours at 860 DEG C at the second stage; (2) a tool bit part of the lathe tool is heated in high-frequency induction heating equipment, the heating temperature is about 1280 DEG C-1300DEG C, after the temperature is maintained for 60 seconds, the heating is over; (3) the lathe tool is taken out of an induction coil of the high-frequency induction heating equipment, oil-quenched, cooled to 250 DEG C and then is taken out of oil, and air-cooled; and (4) tempering is performed twice at the temperature ranging from 550 DEG C to 560 DEG C, the heat preservation time is 2 hours for each time, and after quenching, the external hardness of the tool bit is 64-66 HRC, and the internal hardness is 50-55 HRC. The novel technique for high-frequency heat treatment of the lathe tool has convenient steps, the quality of the lathe tool after the heat treatment meets requirements, and the technique has the advantages of short period, low cost and the like.

Description

technical field [0001] The invention relates to a new process method for high-frequency heat treatment of turning tools, which is used for the heat treatment method of W18Cr4V common turning tools. Background technique [0002] High-frequency quenching refers to a heat treatment method that uses high-frequency current to locally heat and cool the surface of the workpiece to obtain a surface hardened layer. High-frequency quenching only strengthens the surface of the workpiece at a certain depth, and the core basically maintains the structure and performance before treatment. The workpiece after high-frequency quenching has comprehensive mechanical properties such as high strength, high wear resistance and high toughness. [0003] High-frequency quenching is mostly used for surface quenching of industrial metal parts. It is a metal heat treatment method that generates a certain induction current on the surface of the workpiece, rapidly heats the surface of the part, and then ...

AI Technical Summary

Problems solved by technology

Among them, the shape of the turning tool is relatively simple, and its main working part is the blade. The tungsten carbide temperature of the tungsten series high-speed steel has a small decarburization tendency, and the grain is not easy to be thick. For the ordinary turning tool of W18Cr4V, the hardness of the salt bath furnace is not high. Easy to reach 64HRC