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Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body

A vacuum diffusion, hydraulic motor technology, applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., can solve the problems of hydraulic pump/motor cylinder block wear resistance, specific gravity segregation, short service life, etc., to eliminate casting stress And the effect of microscopic defects, dense structure and improved wear resistance

Active Publication Date: 2012-07-04
西安东瑞增材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for bimetallic vacuum diffusion welding of hydraulic pump / motor cylinders, which solves the problems of specific gravity segregation, matrix embrittlement, microcracks, and plunger hole copper sleeve prolapse in the prior art. Issues causing hydraulic pump / motor cylinders to be non-wearable, insufficient in strength and short in service life

Method used

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  • Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body
  • Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body
  • Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1. First make each component according to the drawing specifications, including the base body 27 of the workpiece cylinder, the copper alloy sleeve 24 to be welded, the hemispherical copper alloy plate 23, and the plunger hole expansion core 26 and hemispherical core used in conjunction with the welding process. The surface indenter 21 and the copper alloy sleeve 24 are processed into a structure with a cylindrical outer diameter and a conical inner diameter. The outer circular shape of the plunger hole 26 is matched with the inner hole shape of the copper alloy sleeve 24 to control the size according to the gap. The hemispherical surface pressure The spherical curvature of the head 21 is consistent with the hemispherical copper alloy plate 23;

[0034] then follow figure 2The structure shown in the figure is assembled, that is, a corresponding copper alloy sleeve 24 is pressed into each plunger hole of the base body 27, the tapered opening of the copper alloy sle...

Embodiment 2

[0042] Step 1, implement according to the step of embodiment 1;

[0043] Step 2. Place 3 cylinder components 5 on each layer, and place 3 layers in total; in order to prevent welding between layers, asbestos cloth with a thickness of 2.5 mm must be laid between layers for isolation;

[0044] Step 3. Always control the vacuum degree in the vacuum hot pressing furnace to be 1×10 -2 Pa, and control the temperature rise and pressurization process in the vacuum hot-press furnace according to the following three stages:

[0045] 3.1) within 120 minutes, the temperature in the vacuum hot-pressing furnace is evenly raised from room temperature to 600°C, and at the same time, the downward pressure of the lower pressure head 4 in the vacuum hot-pressing furnace reaches 8 MPa, and the temperature is kept for 15 minutes;

[0046] 3.2) within 80 minutes, the temperature in the vacuum hot-pressing furnace is uniformly raised from 600°C to 750°C, and at the same time, the downward pressure ...

Embodiment 3

[0050] Step 1, implement according to the step of embodiment 1;

[0051] Step 2. Place 7 cylinder components 5 on each layer, and place 3 layers in total; in order to prevent welding between layers, asbestos cloth with a thickness of 2.2mm must be paved between layers for isolation;

[0052] Step 3, sintering: Use the control system to set the corresponding vacuum welding parameters, and always control the vacuum degree in the vacuum hot pressing furnace to 1×10 -1 Pa, and control the temperature rise and pressurization process in the vacuum hot-press furnace according to the following three stages:

[0053] 3.1) within 100 minutes, the temperature in the vacuum hot-pressing furnace is evenly raised from room temperature to 600°C, and at the same time, the downward pressure of the lower pressure head 4 in the vacuum hot-pressing furnace reaches 6 MPa, and the temperature is kept for 12 minutes;

[0054] 3.2) within 70 minutes, the temperature in the vacuum hot-pressing furnac...

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Abstract

The invention relates to a bimetal vacuum diffusion welding method of a hydraulic pump / motor cylinder body. The bimetal vacuum diffusion welding method comprises the following implementation steps of: (1) manufacturing all parts and assembling: pressing a copper alloy sleeve into each plunger hole, inserting a plunger hole expansion core into a hole of each copper alloy sleeve, placing a spherical surface copper alloy plate on the hemispherical surface at the upper end of a basal body, placing plunger hole heat insulation layers between the plunger hole expansion cores and the copper alloy sleeves, and placing hemispherical surface heat insulation layers between hemispherical surface pressure heads and the spherical surface copper alloy plate; (2) charging into a furnace: respectively placing the hemispherical surface pressure head on the upper surface of each cylinder body component, and laying asbestos cloth between layers of each cylinder body component; (3) sintering: controlling the vacuum degree, the heating-up process and the pressurizing process in a vacuum hot-pressing furnace; and (4) firstly uniformly cooling down, and then naturally cooling to the normal temperature. According to the bimetal vacuum diffusion welding method disclosed by the invention, interatomic mutual diffusion bonding of a copper alloy and carbon structural steel of the basal body can be realized, the structure of the copper alloy is more compact, the anti-friction effect is further improved and the working life is significantly prolonged.

Description

technical field [0001] The invention relates to the technical field of mechanical equipment manufacturing, and relates to a method for bimetallic vacuum diffusion welding of a hydraulic pump / motor cylinder body. Background technique [0002] In order to improve the service life of the hydraulic pump / motor cylinder, the plunger hole and hemispherical surface of the cylinder generally use copper alloy as the friction pair material, that is, a layer of copper is attached to the inner surface of the cylinder plunger hole and the outer surface of the hemispherical surface. alloy as a wear-resistant layer. How to combine the wear-resistant layer with the base body (carbon steel) of the cylinder body? Press-fit copper alloy sleeve with interference fit, cast copper alloy on hemispherical surface. Both of these two processes have defects. The overall pouring is prone to specific gravity segregation, which leads to uneven chemical composition of the material and reduces the wear re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02
Inventor 黄经忠
Owner 西安东瑞增材科技股份有限公司
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