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Vacuum brazing method for dissimilar metal of concrete machinery

A technology of concrete machinery and dissimilar metals, which is applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of matrix and hard alloy volume deformation, stress, and affecting the quality of weldments, so as to ensure production efficiency and ensure overall The effect of mass, overall thermal stress and small deformation

Inactive Publication Date: 2021-11-02
XUZHOU XCMG CONSTR MACHINERY CO LTD BUILDING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to address the above deficiencies, to provide a vacuum brazing method for concrete machinery dissimilar metals, especially suitable for the welding of two types of parts and alloys, spectacle plates and cutting rings, and solve the problem of welding temperature in the existing brazing methods. It cannot be precisely controlled, it is easy to cause stress in the weldment, the problem of large deformation of the workpiece, and the difference in volume deformation between the matrix and the hard alloy affects the quality of the weldment, and the complexity of the welding process increases the welding cost.

Method used

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  • Vacuum brazing method for dissimilar metal of concrete machinery
  • Vacuum brazing method for dissimilar metal of concrete machinery
  • Vacuum brazing method for dissimilar metal of concrete machinery

Examples

Experimental program
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Embodiment 1

[0033] This embodiment provides a vacuum brazing method for spectacle plates and alloys of concrete machinery, comprising the following steps:

[0034] The spectacle plate is made of carbon steel plate, and the alloy groove is machined after blanking, which is used as the weldment matrix 1, such as figure 1 shown;

[0035] The selected cemented carbide block 2 is pressed and formed by a mold according to the required shape, then sintered, and trimmed to the required shape and size by machining, and placed in the alloy groove; figure 1 shown;

[0036] Select a 0.3mm thick oxygen-free copper sheet 3 and cut it according to the required shape and size by punching or laser equipment, and place the oxygen-free copper sheet 3 between the substrate 1 and the alloy block 2, such as figure 2 As shown, paste-like copper-based solder is filled between the alloy blocks 2 and the joint gap between the alloy block 2 and the substrate 1, and assembled into a weldment;

[0037] Place the ...

Embodiment 2

[0042] This embodiment provides a vacuum brazing method for a cutting ring of a concrete machine and an alloy, comprising the following steps:

[0043] The cutting ring is made of carbon steel profile, and the alloy groove is machined after blanking, which is used as the weldment matrix 1, such as image 3 shown;

[0044] The selected cemented carbide block 2 is pressed and formed by a mold according to the required shape, then sintered, and trimmed to the required shape and size by machining, and placed in the alloy groove; image 3 shown;

[0045] Select a 0.3mm thick oxygen-free copper sheet 3 and cut it according to the required shape and size by punching or laser equipment, and place the oxygen-free copper sheet 3 between the substrate 1 and the alloy block 2, such as Figure 4 As shown, paste-like copper-based solder is filled between the alloy blocks 2 and the joint gap between the alloy block 2 and the substrate 1, and assembled into a weldment;

[0046] Place the wel...

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Abstract

The invention discloses a vacuum brazing method for dissimilar metal of concrete machinery. The method comprises the steps: processing a base body and alloy blocks according to process requirements, selecting flaky and pasty copper-based brazing filler metal, placing the flaky brazing filler metal in an alloy groove between the base body and the alloy blocks, coating brazing seams between the alloy blocks and between the alloy blocks and the base body with the pasty brazing filler metal, assembling into a weldment, placing the weldment in a vacuum brazing furnace, and performing welding using a multi-stage heating method, a multi-stage heat preservation method and a multi-stage cooling method. The vacuum brazing method is adopted, and in the vacuum brazing process, molten copper alloy, the base body and hard alloy are mutually diffused on the bonding surface to form compact metallurgical bonding; and a multi-stage heating and multi-stage nitrogen cooling method is adopted to replace a high-temperature tapping heat preservation procedure, the brazing temperature can be accurately controlled, the overall quality of the weldment and production efficiency can be guaranteed, the situation that due to high-temperature tapping rapid cooling, quenching thermal stress of the weldment is reduced can be avoided, and overall heating, overall thermal stress and deformation of the weldment are small.

Description

technical field [0001] The invention belongs to the field of metal welding, and more specifically relates to a method for vacuum brazing of dissimilar metals for concrete machinery. Background technique [0002] Spectacle plates and cutting rings are key wear-resistant parts in concrete mechanical equipment. The welding performance of the substrate and the alloy restricts the service life of the workpiece. The welding of two types of dissimilar metals has always been a difficult problem in the industry. Common welding processes are manual brazing, furnace brazing and induction brazing. Artificial copper brazing is a process in which brazing powder is added between the alloy and the substrate, and the copper rod is melted into the brazing seam by flame gas welding after being heated by a resistance furnace. Brazing in the furnace is a process of adding brazing filler metal between the alloy matrix, adding brazing paste in the brazing seam, and heating the prepared weldment i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20
CPCB23K1/008B23K1/20
Inventor 韩猛贾华东董新炜陈飞刘晓军
Owner XUZHOU XCMG CONSTR MACHINERY CO LTD BUILDING MACHINERY
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