Method for manufacturing steel-copper composite kit

Abstract

The invention discloses a method for manufacturing a steel-copper composite kit. The method comprises the following steps of: (1) arranging an inner casting mold with selected size in an inner casting mold of a centrifugal casting machine, and fixing an end cover, wherein the inner casting mold is heated to the temperature of between 250 and 350 DEG C before installation and then the inner wall of the inner casting mold is coated with quartz powder coating of 2 to 3 millimeters; (2) quantitatively pouring molten steel into the rotating inner casting mold, wherein the revolution number of the centrifugal casting machine is determined by the following formula: n=Kr-1 / 2; (3) when the temperature of the inner surface of a steel sleeve prepared in the step (2) is between 1,420 and 1,500 DEG C, quantitatively pouring molten copper alloy into the steel sleeve, improving the revolution speed of the casting mold by 10 to 20 percent, and spraying water to cool the casting mold, wherein the pouring temperature of the copper alloy is controlled at 30 to 50 DEG C above a molten copper alloy phase line; and (4) controlling the thickness of a steel-copper co-melting layer by selecting the temperature of the inner surface of the steel sleeve and pouring the molten copper alloy. The method is simple in process, does not need medium machining process, and can be used for manufacturing big and small pieces.

Description

technical field [0001] The invention relates to a method for manufacturing a steel-copper composite set, belonging to the technical field of mechanical manufacturing. Background technique [0002] Copper kits have always been favored by users. It not only makes the shaft, bearings, frame, etc. fit more compactly, but also protects the shaft well and improves the service life of the shaft. However, the price of metal copper is relatively high, and it is an important strategic resource that is increasingly scarce, and it is also a scarce heavy metal with less reserves. A large number of wear-resistant sets widely used in large machinery and ships are mostly made of copper alloys. In consideration of saving precious resources and reducing product costs, steel-copper composite sets are a way to replace copper with steel. At present, there are three main types of manufacturing processes for domestic steel-copper composite structures. The first is the processing and assembly met...

AI Technical Summary

Problems solved by technology

The above two methods have complicated procedures and high production costs, and because the steel and copper have not achieved interfacial fusion, there are always more or less gaps at the junction of the two materials. After a long period of use, the joint surface of the two materials Corrosion, looseness and other problems are prone to occur, resulting in decreased equipment accuracy, increased noise, and reduced equipment service life

The third is to hot-roll steel and copper into bimetallic hot-rolled sheets. At high temperatures, there is a certain amount of atomic diffusion at the steel-copper interface, and the interface bonding is better than the previous method, but it needs to be welded into a kit in the end, and it is difficult to make a thick bimetallic kit. , the welding process is complicated and it is difficult to ensure the quality of the weld seam

It is precisely because of the above problems that the application of steel-copper composite kits is less

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