New Pouring Technology of Sliding Bearing Babbitt Bearing Pad

Abstract

The invention relates to a novel pouring process for a Babbit metal bearing bush of a sliding bearing. The novel pouring process comprises the steps: firstly, carrying out heat treatment and cooling treatment on a matrix, polishing to remove an oxidation layer, and cleaning the bearing bush; carrying out tinning treatment after finishing treatment, and placing the whole bearing bush into molten tin in the treatment process to achieve a better effect, wherein ammonium chloride and zinc chloride are adopted as reagents to play oxidization preventing and curing roles; and finally, carrying out extrusion pouring on Babbit metal, pouring molten Babbit metal into the bearing bush, and carrying out extrusion treatment by using a die to obtain an excellent finished product of the Babbit metal bearing bush. The invention also provides a set of brand new die to ensure that the process effect is better. By using the novel pouring process, the defect such as shrinkage porosity at the far end of a pouring gate can be avoided, the compactness of a casting is improved, and the excellent bearing bush is manufactured.

Description

technical field [0001] The invention relates to a casting process, in particular to a new casting process of a babbitt alloy bearing bush of a sliding bearing. Background technique [0002] At present, the centrifugal casting method is mostly used in China. The process is relatively complicated and the equipment is complex, which will cause a certain waste of alloys, lead to the degradation of the performance of the Babbitt alloy itself, and are prone to defects such as segregation, stripping, electric cracking, and air bubbles. In addition, the life of the bearing bush cast on the surface of Babbitt alloy is generally short, the shortest life is about 45 minutes, and the longest life is no more than two years. Large-scale Babbitt alloy shell castings are generally sand-cast by gravity casting. During the pouring process, the molten metal is prone to splash, oxidation, and gas entrainment, resulting in defects such as pores and inclusions in the castings, making the surface ...

AI Technical Summary

Problems solved by technology

Although this process ensures stable filling from bottom to top and solidification under pressure, it cannot guarantee the sequential solidification of castings, ingates and sprues

Theoretically, it is required that the sprue and slot runner should be slower than the cooling of the shell, but in production, when the slot runner is too wide or too narrow, it will affect the assembly of the shell, resulting in defects such as casting shrinkage cracks or insufficient feeding.

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