Casting method of copper-steel bimetallic composite material for plunger pump cylinder body

Abstract

The invention discloses a casting method of a copper-steel bimetallic composite material for a plunger pump cylinder body. The casting method comprises the following steps: S1, raw material treatment: cleaning the surfaces of a steel substrate and a copper alloy; s2, sand adding, wherein a proper amount of borax is added into a copper melting pool of a steel base body, and then the copper alloy is placed on the borax; s3, high-temperature fusion casting is conducted, specifically, the steel base body and the copper alloy are put into a fusion casting furnace to be heated; and S4, cooling is conducted, and the copper-steel double-metal composite material is obtained. Single-temperature-zone casting is adopted, the material size is small in limitation, the material is taken out of a furnace for cooling, the cooling condition is easy to regulate and control, a proper amount of borax in a loose state is added into a steel matrix copper melting pool, operation is convenient, the surface of a steel matrix is purified, meanwhile, the effects of heat preservation, oxidation prevention and copper alloy fluxing are achieved, in addition, a temperature gradient is formed during cooling, and the temperature gradient is increased. And the copper alloy can be directionally solidified, so that the casting quality of a copper alloy layer and good interface metallurgical bonding are ensured.

Description

technical field [0001] The present patent application relates to the technical field of bimetallic composite materials, and in particular to a method for melting and casting copper-steel bimetallic composite materials for piston pump cylinders. Background technique [0002] The plunger pump is the core component of hydraulic equipment, and the cylinder block is the key friction pair part of the plunger pump and the core of the plunger pump. The performance and quality of the cylinder block directly affect the transmission efficiency and service life of the plunger pump. At present, the most widely used material for piston pump cylinder is copper-steel bimetallic composite material. As the working layer of the friction pair, copper alloy (especially lead bronze) has good anti-friction, wear-resisting and fatigue-resisting properties. The soft and hard phase structure determines that it has good anti-occlusal, embedded and compliance properties. The steel material as the base...

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Problems solved by technology

Chinese patents CN107537993A and CN106001443B disclose a casting method for a plunger pump cylinder. The method is to pour the smelted lead bronze alloy liquid into a heated steel matrix to obtain a bimetallic cylinder blank. The process is complicated. And the use of copper alloy is relatively large, resulting in more material waste

Chinese patent CN110434315A discloses a method for preparing a copper-steel bimetal cylinder in a multi-temperature zone melting and casting furnace. The method is to place the copper alloy on the steel substrate, and then go through three stages of preheating, heating and cooling to obtain a plunger pump. Cylinder blanks, the equipment used in this method occupies a large area, and it is difficult to produce cylinders with large specifications, such as plunger pump cylinders for shield machines, the specifications and sizes of cylinders that can be cast are subject to large limits

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