Methods to prevent gasket deformation, oxidation and decarburization

Abstract

The invention discloses a method for preventing deformation, oxidization and decarburization of gaskets. The method includes the following steps that firstly, a set of the gaskets are blanked, that is, cylindrical gasket materials are blanked with machining allowance reserved; secondly, the gasket materials are put into a box type heating furnace to be heated, the heating temperature is 830-850 DEG C, the heat preservation time is 1-3 h, then the gasket materials are quenched in water for 15-30 min and then tempered in time, and the tempering time is not more than 4 h; thirdly, the gasket materials are tempered in a box type tempering furnace at the temperature of 520-560 DEG C after being quenched, the heat preservation time is 2-4 h, and the gasket materials are discharged out of the furnace and cooled in the air; fourthly, the two ends of the gasket materials are cut off in order to remove oxidation and decarburization; fifthly, an outer circle is machined to the size of a finished product; sixthly, an inner hole is machined to the size of the finished product; and seventhly, each gasket is cut according to the thickness of the finished product. The whole set of gaskets with machining allowance reserved are heated and then machined, so that the gaskets completely meet the drawing technical requirements, oxidization, decarburization and oxidization of the gaskets are avoided, and the deformation requirement of machining and assembling of the gaskets is met.

Description

technical field [0001] The invention belongs to the field of metal heat treatment, in particular to a novel method for preventing gasket deformation, oxidation and decarburization. Background technique [0002] In actual application, the thickness of many gaskets on railway locomotives is only about 4-8 mm. Box-type heating furnaces and tempering furnaces are used both at home and abroad to heat-treat, quench and temper gaskets individually. Our company adopts this process. However, there are serious deformation, oxidation, decarburization and other problems in the gasket during heat treatment. This can't meet the needs of next process processing, and product quality also can't satisfy service requirement simultaneously. At home and abroad, salt bath furnaces and box-type tempering furnaces are also used to heat-treat, quench, and temper the gaskets individually. Although this heat treatment method can improve the oxidation and decarburization of the gasket to a certain ex...

AI Technical Summary

Problems solved by technology

Although this heat treatment method solves the problems of oxidation and decarburization of the gasket, and also improves the deformation of the gasket to a certain extent, it still cannot fundamentally solve the deformation problem of the gasket.

Moreover, the cost of vacuum furnace equipment is high, the operation cost is high, and the heat treatment cost of parts is expensive, so this process cannot be widely used