Carburization quenching method for round hole thin wall work-piece

Abstract

The invention discloses a round hole thin wall type work piece cementing and quenching method. After a work piece processed mechanically is cemented routinely, the work piece is taken from a furnace, and a round column shaped pre-expanding mold is installed into an inner hole immediately, the outer diameter of the pre-expanding mold is processed to be 0.1 to 0.25 mm larger than the drawing size of the hole diameter of the work piece, then the work piece and the pre-expanding mold are immersed into the quenching oil quickly and vertically according to the quenching technology, and then are tempered after the work piece and the pre-expanding mold are taken out of oil, the pre-expanding mold is pressed out steadily through a hydraulic machine after being cooled, and rotoblasting, examination and warehousing are performed finally. If the attrition of the pre-expanding mold is out of tolerance, the pre-expanding mold can be reused after being renovated. The method is suitable for the round hole thin wall type work piece cementing and quenching method such as a vehicle gear ring, and a bearing sleeve ring, the distortion of the work piece can be avoided or reduced, the product quality is guaranteed, the operation is simple, the technology is normative, the investment is less, the cost is low, and the production efficiency is high.

Description

technical field [0001] The invention relates to a metal heat treatment method, in particular to a carburizing and quenching method for round-hole thin-wall workpieces. Background technique [0002] Thin-walled workpieces with round holes, such as car ring gears, will be deformed to varying degrees due to the effects of thermal stress and tissue stress during carburizing and quenching. big problem. The methods used at present, one is to redress the workpiece after quenching, and the other is to use pressure machinery to force the shape during quenching, both of which have the defects of troublesome operation, increased cost and low production efficiency. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a carburizing and quenching method for thin-wall workpieces with round holes, which is easy to operate, low in cost, high in efficiency and good in use effect. [000...

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