Method for processing integral concave mould of universal joint

Abstract

The invention discloses a method for processing an integral concave mould of a universal joint. The method comprises the following steps: (1) processing an external mould: sawing materials, roughly turning a big circle and a middle circle of the external mould, thermally treating, finely turning and grinding before pressing, thermally pressing the big circle and the middle circle, finely turning an inner hole and grinding the inner hole; (2) processing an internal mould: sawing materials, roughly turning, thermally treating, finely turning, flatly grinding, roughly milling an inner chamber and finely milling the inner chamber; and (3) cold-pressing the processed external mould and internal mould, wherein 0.3-0.5% interference fit of the outer diameter of the internal mould is adopted between the internal and external moulds, thereby obtaining the integral concave mould of the universal joint. The invention discloses a new method for processing the integral concave mould of the universal joint. The integral concave mould of the universal joint processed according to the method is high in size precision, has convenience in assembling and exchanging and has a positive practical significance.

Description

technical field [0001] The invention relates to a processing method of a mold, in particular to a processing method of an integral concave mold of a universal joint. Background technique [0002] At present, among the constant velocity universal joint products in automobile gearboxes, most of them are products with irregular shapes and inner cavities. Life and processing cycle. [0003] In the prior art, there are mainly the following two processing methods for the molds used to prepare universal joints: one is that the special-shaped inner cavity size of the concave mold can only be completed after reprocessing after the outer mold and the inner mold are pressurized; The disadvantage is that the mold processing cycle is long, and the outer mold cannot be reused. Once the inner mold cannot be used, both the outer mold and the inner mold are scrapped, so the material waste is serious and cannot meet the requirements of mass production. The second is the inner mold processin...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are mainly two processing methods for the molds used to prepare universal joints: one is that the special-shaped inner cavity size of the concave mold can only be completed after reprocessing after the outer mold and the inner mold are pressurized; The disadvantage is that the mold processing cycle is long, and the outer mold cannot be reused. Once the inner mold cannot be used, both the outer mold and the inner mold are scrapped, so the material waste is serious and cannot meet the requirements of mass production.

The second is the inner mold processing method of the concave mold, heat treatment after rough milling the special-shaped inner cavity, and then fine milling the inner cavity; the inner mold produced by this method has a large difference in diameter between the irregular shape of the inner cavity and the circular part , during heat treatment, the stress changes of the special-shaped and circular parts are different, and a large internal stress will be formed at the connection of the two parts, which cannot be removed during the subsequent finishing milling process, causing the mold to easily appear during use. Transverse cracks greatly shorten the service life of the mold

Images