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Welding method of hard alloy cutting tool

A technology of cemented carbide and cutting tools, applied in the direction of welding media, welding equipment, welding/cutting media/materials, etc., can solve the problem of low yield of cemented carbide tools, carbide cracks, stripping and fragments, and affecting tools Quality and service life and other issues, to achieve the effect of improving tool quality, reducing the difficulty of operation, and reducing the phenomenon of stripping and debris after brazing

Inactive Publication Date: 2003-07-09
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual operation process, due to the difference in material properties between the cemented carbide and the base steel, there is a large difference in the thermal expansion coefficient (the cemented carbide is about 6×10 -6 , the steel is 12×10 -6 ), when silver-based or copper-based solder is used for brazing, a large stress will be generated, which often causes cracks, peeling and fragmentation of the cemented carbide after the tool is brazed and cooled, resulting in finished products produced by the cemented carbide tool The rate is low, which also affects the quality and service life of the tool

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] An example of a process for brazing cemented carbide to steel. First clean the steel substrate and the hardened surface to be welded. The lap joint type is adopted, and a layer of copper brazing sheet covered with Ag-based brazing filler metal is inserted into the steel and hard alloy welding joint, and a layer of brazing flux is coated on the brazing filler metal sheet and the substrate welding sheet to control The brazing gap is 0.05mm, fixed with a clamp, and the joint is under pressure. Then use flame brazing to weld the joints. When the solder melts and flows into the brazing seam to fill the gap, then stop heating and cool to normal temperature in the air. Then remove the residual material on the weldment to complete the welding, and the welded carbide tool is firmly welded.

Embodiment 2

[0016] An example of a process for brazing cemented carbide to steel. First clean the steel substrate and the hardened surface to be welded. The lap joint type is adopted, and a layer of copper brazing sheet coated with Cu-based brazing filler metal is inserted into the steel and hard alloy welding joint, and a layer of flux is applied on the brazing filler metal sheet and the substrate welding sheet to control The brazing gap is 0.13mm, fixed with a clamp, and the joint is under pressure. Then use flame brazing to weld the joints. When the solder melts and flows into the brazing seam to fill the gap, then stop heating and cool to normal temperature in the air. Then clean the residual material on the weldment to complete the welding, and the welded carbide tool is firmly welded.

Embodiment 3

[0018] A copper sheet brazing sheet with tightly adhered brazing filler metal was prepared.

[0019] Choose a copper plate with a thickness of 3.0mm and an AgAuCd alloy plate with a thickness of 1.5mm. The plane size of the copper plate is 10mm larger than that of the AgCuZnCd alloy plate to improve the utilization rate of precious metal materials. The AgCuZnCd alloy plate is ground and cleaned by explosive composite technology. Firstly, AgCuZnCd and Cu are explosively compounded on one side of AgCuZnCd / Cu=1:2, then the flat surface of the AgCuZnCd / Cu double-layer composite board is finished, the Cu surface is ground and cleaned, and then the explosive compounding of AgCuZnCd / Cu and AgCuZnCd is carried out. Then AgCuZnCd / Cu / AgCuZnCd=1:2:1. Then, the three-layer composite sheet is ground, cleaned and annealed, and then rolled and annealed several times. The control process conditions are 450°C-550°C, heat preservation for 40 minutes-60 minutes, and the total processing rate be...

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PUM

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Abstract

The present invention relates to a method for soldering connection of hard alloy and tool steel. Said invention adopts siler base or copper base solder to solder cutter. When soldering, between hard alloy and steel base material a soft red copper transition piece is inserted to make soldering connection. After soldering, the heat stress produced by soldering can be effectively absorbed by soft red copper piece, so that it can raise finished product rate of the cutter production.

Description

(1) Technical field [0001] The invention relates to a welding method of a hard alloy cutting tool, relating to a method for brazing and connecting a hard alloy and a tool steel in the manufacture of a mechanical turning tool. (2) Background technology [0002] In the manufacturing process of mechanical turning tools, considering the reasons of cost and processing, the small-sized cemented carbide used for cutting is usually brazed on the steel material substrate. In the actual operation process, due to the difference in material properties between the cemented carbide and the base steel, there is a large difference in the thermal expansion coefficient (the cemented carbide is about 6×10 -6 , the steel is 12×10 -6 ), when silver-based or copper-based solder is used for brazing, a large stress will be generated, which often causes cracks, peeling and fragmentation of the cemented carbide after the tool is brazed and cooled, resulting in finished products produced by the cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K35/24
Inventor 李明利柏文超李银娥马蕊侠杜平贾勇庄为民马光
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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