Method for manufacturing steel and copper bimetallic bearing for excavating machine

A technology of excavating machinery and bimetal, applied in the field of materials, can solve problems such as poor consistency of electroplating, unsatisfactory bonding effect of copper layer and steel layer, etc., and achieve a firm bonding effect

Inactive Publication Date: 2012-12-05
平和龙粉末冶金(珠海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the bonding layer of copper and steel is an electroplated copper layer, which is relatively thin, and the consistency of electroplating is not good inside the steel pipe, the bonding effect of the copper layer and the steel layer is not very ideal, and its copper alloy material needs to be further improved. Improved for better performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing a steel-copper bimetallic bearing for excavating machinery, said method comprising the steps of:

[0019] 1) The carbon steel or stainless steel pipe is machined into a seamless steel sleeve, the inner hole is processed to the required size, and the secondary processing allowance of the wall thickness is guaranteed;

[0020] 2) Put -200 mesh pure copper powder into a ring mold for pressing, the pressing pressure is 350MPa, and ensure that the outer diameter of the pressed ring blank after demoulding is about 0.03-0.05mm larger than the inner diameter of the aforementioned steel sleeve, and the thickness is prepared The ring-shaped blank is 1mm; the ring-shaped blank is pressed into the steel sleeve with a small press to form an assembly; the assembly is placed in a reducing atmosphere or an inert atmosphere sintering furnace for sintering, the sintering temperature is 800 ° C, and the sintering time is After 150 minutes, it was cooled to 300°C wit...

Embodiment 2

[0025] A method for preparing a steel-copper bimetallic bearing for excavating machinery, said method comprising the steps of:

[0026] 1) The carbon steel or stainless steel pipe is machined into a seamless steel sleeve, the inner hole is processed to the required size, and the secondary processing allowance of the wall thickness is guaranteed;

[0027] 2) Put -200 mesh pure copper powder into a ring mold for pressing, the pressing pressure is 450MPa, and ensure that the outer diameter of the pressed ring blank after demoulding is about 0.03-0.05mm larger than the inner diameter of the aforementioned steel sleeve, and the thickness is prepared The ring-shaped blank is 0.5mm; the ring-shaped blank is pressed into the steel sleeve with a small press to form an assembly; the assembly is placed in a reducing atmosphere or an inert atmosphere sintering furnace for sintering, the sintering temperature is 830 ° C, and the sintering time is It takes 90 minutes to cool down to 300°C w...

Embodiment 3

[0032] A method for preparing a steel-copper bimetallic bearing for excavating machinery, said method comprising the steps of:

[0033]1) The carbon steel or stainless steel pipe is machined into a seamless steel sleeve, the inner hole is processed to the required size, and the secondary processing allowance of the wall thickness is guaranteed;

[0034] 2) Put -200 mesh pure copper powder into a ring mold for pressing, the pressing pressure is 400MPa, and ensure that the outer diameter of the pressed ring blank after demoulding is about 0.03-0.05mm larger than the inner diameter of the aforementioned steel sleeve, and the thickness is prepared The ring-shaped blank is 0.8mm; the ring-shaped blank is pressed into the steel sleeve with a small press to form an assembly; the assembly is placed in a reducing atmosphere or an inert atmosphere sintering furnace for sintering, the sintering temperature is 815 ° C, the sintering time It takes 120 minutes to cool down to 300°C with the...

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Abstract

The invention discloses a method for manufacturing a steel and copper bimetallic bearing for an excavating machine. The method comprises the following steps of: 1) manufacturing a steel sleeve; 2) manufacturing an annular blank of which the thickness is 0.5 to 1 millimeter by using pure copper powder, sintering the annular blank and the steel sleeve to manufacture a composite steel sleeve, and turning a lining pure copper layer, so that the lining pure copper layer is reduced to 0.2 to 0.3 millimeter; 3) manufacturing a copper-base powder metallurgical material, mixing, compressing to manufacture an annular compressed blank, pressing the compressed blank in the composite steel sleeve to form a combination piece, wherein the copper-base powder metallurgical material consists of the following components in percentage by weight: 12 to 14 percent of -200-mesh aluminum powder, 1 to 3 percent of -300-mesh manganese powder, 0.5 to 1.5 percent of -300-mesh tin powder, 7.5 to 8.5 percent of -200-mesh iron powder, 0.2 to 0.4 percent of -200-mesh cerium powder, 2 to 3 percent of colloid molybdenum disulfide, 4 to 5 percent of -120-mesh crystalline flake graphite and the balance of -200-mesh electrolytic copper powder; 4) sintering the combination piece for forming; and 5) performing aftertreatment.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing a steel-copper bimetal bearing for excavating machinery. Background technique [0002] In recent years, with the rapid development of technology in the field of construction machinery, higher requirements have been put forward for the key working devices of hydraulic excavators, especially large-tonnage and high-power excavators. The working device is a device that directly completes the excavation task, and its reliability has a great influence on the performance of the hydraulic excavator. It is composed of three parts: the boom, the stick, and the bucket. The lifting of the boom, the expansion and contraction of the stick, and the rotation of the bucket are all controlled by reciprocating double-acting hydraulic cylinders. In order to meet the needs of various construction operations, the hydraulic excavator can be equipped with a variety of working devices, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F7/08
Inventor 李艳
Owner 平和龙粉末冶金(珠海)有限公司
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