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A method for welding steel parts and hard alloy cutting tools by low-temperature brazing

A cemented carbide blade and cemented carbide technology, applied in welding equipment, metal processing, manufacturing tools, etc., can solve problems such as fracture and cracks, achieve low melting temperature, improve production efficiency, and have obvious advantages

Active Publication Date: 2016-06-01
CHENGDU GERUN HI TECH MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the brazing of tool steel and cemented carbide is usually completed by high-temperature brazing at 700°C to 800°C, but after welding, cracks and even fractures are prone to occur due to the difference in thermal expansion coefficient between the two at room temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for welding steel parts and hard alloy cutters by low-temperature brazing, comprising the following steps:

[0023] S1. Pretreatment: Sandblasting the cemented carbide blade, and then cleaning and degreasing the parent steel, cemented carbide blade and solder respectively;

[0024] S2. Welding copper: heat the brazing flux until it is boiled into a paste, then apply the brazing flux to the surface of the parent steel, brazing filler metal, copper sheet and hard alloy blade, and add the brazing filler metal to the parent steel and copper sheet Between them, a layer of copper with a thickness of 0.25mm is welded on the welding surface of the parent steel piece, and similarly, a layer of copper with a thickness of 0.25mm is also welded on the welding surface of the cemented carbide blade;

[0025] S3. After the welding is completed, immediately place the parent steel piece and the cemented carbide blade in a holding furnace at 280°C for 6 hours, and then slowly co...

Embodiment 2

[0031] A method for welding steel parts and hard alloy cutters by low-temperature brazing, characterized in that it comprises the following steps:

[0032] S1. Pretreatment: Sandblasting the cemented carbide blade, and then cleaning and degreasing the parent steel, cemented carbide blade and solder respectively;

[0033] S2. Welding copper: heat the brazing flux until it is boiled into a paste, then apply the brazing flux to the surface of the parent steel part, brazing material, copper sheet and hard alloy blade, and add the brazing material to the parent steel part and copper sheet Between them, a layer of copper with a thickness of 0.4mm is welded on the welding surface of the parent steel piece, and similarly, a layer of copper with a thickness of 0.35mm is welded on the welding surface of the cemented carbide blade;

[0034] S3. After the welding is completed, immediately place the parent steel piece and the cemented carbide blade in a holding furnace at 290°C for 6.5 hou...

Embodiment 3

[0040] A method for welding steel parts and hard alloy cutters by low-temperature brazing, characterized in that it comprises the following steps:

[0041] S1. Pre-treatment: Sandblasting the cemented carbide blade, and then cleaning and degreasing the parent steel, cemented carbide blade and solder respectively;

[0042] S2. Welding copper: heat the brazing flux until it is boiled into a paste, then apply the brazing flux to the surface of the parent steel part, brazing material, copper sheet and hard alloy blade, and add the brazing material to the parent steel part and copper sheet Between them, a layer of copper with a thickness of 0.5mm is welded on the welding surface of the parent steel piece, and similarly, a layer of copper with a thickness of 0.5mm is also welded on the welding surface of the cemented carbide blade;

[0043] S3. After the welding is completed, immediately place the parent steel piece and the cemented carbide blade in a holding furnace at 300°C for 7 ...

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PUM

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Abstract

The invention relates to a low-temperature brazing method of a cutter. A low-temperature brazing parent part and a hard alloy blade are adopted, brazing flux is coated onto the surfaces of the parent part, brazing filler metal, a copper sheet and the hard alloy blade, the brazing filler metal is added between the parent part and the copper sheet or between the hard alloy blade and the copper sheet, the copper sheet is respectively welded onto the parent part and the hard alloy blade, then the welded part is immediately placed in a heat preserving furnace at 280-300 DEG C for preserving heat for 6-7h, the part is cooled to room temperature with the furnace after the temperature is decreased to 100-150 DEG C and the heat is preserved for 10-12h, the bottom of base metal is slowly heated, heating is stopped when the brazing flux starts to melt and can freely flow, heating is continuously performed when the brazing flux cannot flow smoothly, repetition for several times is performed in such way to weld the hard alloy blade onto the base metal, and finally the welded part is cooled to room temperature with the furnace in the heat preserving surface at 100-150 DEG C. The low-temperature brazing method of the cutter has the advantage of high production efficiency and avoids the problems that the hard alloy blade is cracked and ruptured and the like.

Description

technical field [0001] The invention relates to cutting tool processing technology, in particular to a method for welding steel parts and hard alloy cutting tools by low-temperature brazing. Background technique [0002] Low-temperature brazing technology belongs to soft soldering, and 450°C is often used as the dividing line between soft and hard brazing. Brazing is a welding technique that uses a solder with a lower melting temperature than the base metal, and the operating temperature is lower than the solid phase of the base metal and higher than the liquidus of the solder. When brazing, the solder melts into a liquid state, while the base metal remains solid, and the liquid solder wets, capillary flows, fills, spreads, and interacts with the base metal (dissolution, diffusion, or intermetallic formation) in the gaps or on the surface of the base metal. Compound), cooled and solidified to form a strong joint, thereby connecting the base metal together. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/00B23K1/20B23K101/20
CPCB23K1/0008B23K1/20B23K2101/20
Inventor 李诚尚
Owner CHENGDU GERUN HI TECH MATERIALS
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