Method for preparing composite worm or bearing bush

Abstract

The invention discloses a method for preparing a composite worm or bearing bush, which comprises the following steps of: a, casting ductile iron or low-carbon steel to form a worm matrix, processing the tooth form of the matrix until the size is slightly smaller than the required size, and keeping out a welding layer margin; b, performing fusion welding of a copper alloy welding wire on the matrix surface to manufacture a worm blank of which the matrix surface is covered with a uniform and compact welding layer by adopting a sub laser pulse welding, pulse argon arc welding or laser pulse cluster fusion welding mode; c, performing high tempering or vibration aging treatment to eliminate internal stress; and d, milling the worm blank to meet the requirement of design size by using a formingtool. The advantages of two materials are integrated, so the bearing capacity of the product is enhanced, valuable materials are greatly saved, and indexes of mechanical properties greatly exceed those of a product prepared in a casting mode.

Description

technical field [0001] The invention relates to a worm wheel and a bearing bush widely used in mechanical transmission devices, belonging to the technical field of transmission devices. Background technique [0002] In the mechanical transmission device, a large number of worm gears of various specifications are used. In order to improve the wear resistance of the worm gear, copper alloy is indispensable. However, due to the high price of copper alloys, in order to reduce the cost of worm gears, two structural methods are generally used in the use of worm gears: one is integral casting, and the other is cast iron core plus copper alloy ring gear. Generally speaking, when the gear modulus is less than 4, the overall casting method is adopted. If the modulus is greater than 4, the structure of iron core and copper alloy ring gear is adopted. But no matter what kind of structure, a large amount of copper alloy is used in the manufacture of worm gears, which makes it difficult ...

AI Technical Summary

Problems solved by technology

Sliding bearings generally adopt an integral structure, and they can only be scrapped after wear and tear, and cannot be repaired

In addition, the inner walls of some sliding bearings are sprayed with tin, zinc, aluminum, and Babbitt alloys. These products also have defects such as low impact strength, poor wear resistance, and low temperature resistance.

[0006] In view of the disadvantages of the existing worm gear structure, in order to reduce costs, some manufacturers use unqualified materials or reduce the structural size of the worm gear. There are serious quality problems in matching worm gears and sliding bearings

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