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Composite technique for rolling semi-solid state copper-lead bearing alloy/steel bi-metal

A copper-lead bearing, rolling composite technology, applied in metal rolling, metal rolling, metal processing equipment and other directions, can solve problems such as poor adhesion, lead segregation, inclusions, etc., to eliminate looseness, solve lead segregation, improve The effect of interfacial bond strength

Inactive Publication Date: 2008-08-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of this kind of bimetallic plates are lead segregation, looseness, poor bonding, inclusions and other defects.

Method used

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  • Composite technique for rolling semi-solid state copper-lead bearing alloy/steel bi-metal
  • Composite technique for rolling semi-solid state copper-lead bearing alloy/steel bi-metal

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] The grade of copper-lead bearing alloy selected is CuPb22Sn, and its main component weight percentage content is 22.0% Pb, 1.0% Sn, and the rest is Cu. The steel plate is an ordinary low-carbon steel plate with a carbon content of 0.2%, and the size of the steel plate is 150mm in length / 100mm in width / 5mm in thickness. The specific process for preparing bimetallic slabs is as follows:

[0026] 1) steel plate pretreatment

[0027] First, polish the surface of the steel plate with a wire brush to remove surface dirt. After polishing, soak the steel plate in 10% NaOH solution at 80°C for 5 minutes to remove grease, shake it when taking it out, and then use hot water at 60°C to remove residual alkali. Then put it into 10% HCl solution for derusting for 8 minutes, and the surface of the steel plate is bright silvery white. After rinsing the remaining acid solution on the surface of the steel plate with clean water, put the steel plate in 90°C borax aqueous solution (20% c...

example 2

[0036] The selected copper-lead bearing alloy and the composition and size of the steel plate are the same as the example 1, and the concrete process for preparing the bimetallic slab is as follows:

[0037]1) The process is the same as in Example 1, but the preheating temperature of the steel plate is 500°C.

[0038] 2) The process is the same as Example 1, but the temperature of the prepared semi-solid copper-lead bearing alloy slurry is 970°C.

[0039] 3) After the steel plate is preheated to 500°C, it is taken out from the box-type resistance furnace, and the prepared copper-lead alloy semi-solid slurry is poured on the steel plate, and the thickness of the copper-lead alloy layer is 8mm. The semi-solid copper-lead alloy and solid steel plate are sent to the rolling mill for rolling and compounding. The rolling speed is 30mm / s. After rolling, the thickness of the steel plate remains basically unchanged, and the thickness of the copper-lead alloy layer is 4mm.

[0040] 4...

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Abstract

The invention relates to a roll-bonding process for semisolid copper-lead bearing alloys / steel bimetals. The weight content percentage of the lead in the copper-lead bearing alloy is 10.0 to 30.0%. In order to refine the crystalline grain of the lead and improve the mechanical property of the alloy, sulfur, tin, nickel, manganese, rare earth and other the third alloy elements can be added in the copper-lead alloy. The process comprises four steps: pretreatment of steel plates, preparation of semisolid sizing agent, roll bounding and water cooling. The detailed process comprises the following steps: performing mechanical agitation to the melted copper-lead bearing alloys at 930 to 1050 DEG C to obtain the semisolid sizing agent; pouring the semisolid sizing agent on the pretreated steel plates; synchronously feeding the semisolid copper-lead bearing alloys and solid steel plates in to a mill for rolling; spraying water for cooling to obtain the bimetallic composite plate. The invention effectively overcomes the defect of lead segregation in the production of the copper-lead bearing alloys in the prior art, therefore, metallographic structure with fine lead particle and even distribution is obtained. According to mechanical test results, the interfacial shear strength of the copper-lead bearing alloys / steel bimetallic slabs prepared using the process is more than 60Mpa, increased by about 10Mpa.

Description

technical field [0001] The invention relates to a preparation process of a copper-lead bearing alloy / steel bimetal composite material, in particular to a semi-solid copper-lead bearing alloy / steel bimetal rolling composite process. Background technique [0002] Copper-lead alloys are widely used to manufacture bearings for automobiles, tractors, engines, and high-speed, high-horsepower diesel engines. Because the solid solubility of lead in copper is very small, lead is distributed in the copper matrix in the form of separate particles in the copper-lead tissue, and the soft lead particles act as lubricants when the friction is stressed, so that the copper-lead bearing has a small friction coefficient, It has the characteristics of conformability and embedded plasticity to impurities, and copper, as a hard matrix, makes it have high load-bearing capacity. In addition, copper-lead alloy has high thermal conductivity, its mechanical properties are not significantly affected b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/38B21B47/02B21B47/00B21B37/46B21B45/02B21B37/74C22C9/08B22D1/00
Inventor 康永林张帆杨柳青陶涛崔建利
Owner UNIV OF SCI & TECH BEIJING
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