Process for cold extrusion forming of one-way device spline sleeve

Abstract

The invention provides a process for cold extrusion forming of a one-way device spline sleeve. The process comprises the steps of utilizing hollow pipes to serve as raw materials, performing blanking according to specified dimensions, sequentially performing annealing, head flattening, shot blasting, phosphatization and saponification treatment, cold extrusion shaping, cold extrusion spline forming, machining, quenching, tempering, shot blasting, cleaning and grinding machine processing, and obtaining finished product one-way device spline sleeves. The one-way device spline sleeves obtained through the process are high in precision, small in individual differences, good in strength performance and long in service lives.

Description

technical field [0001] The invention relates to the technical field of machine parts processing, in particular to a cold extrusion molding process of a checker spline sleeve. Background technique [0002] The spline sleeve of the one-way device is an important part of the automobile engine, and its basic structure is a round tube, wherein a spline is arranged on the inner surface of one side of the round tube. Most of the existing processing methods for the spline sleeve of the one-way device are machining methods, which not only cause serious environmental pollution, high production cost, low production efficiency, but also low service life and low precision of the obtained spline. Therefore, at present, there is also a process for processing this kind of workpiece using a cold extrusion process. [0003] The Chinese invention patent with the notification number CN102501036B discloses a processing method for a gear used in a one-way device. The processing process is as fol...

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Problems solved by technology

In terms of the strength and precision of the workpiece, especially the precision and strength of the tooth shape, this process is indeed greatly improved compared with the existing machining methods, but there are still many problems: (1) the use of 20cr alloy structural steel bars As raw materials, it still causes a lot of waste of materials, and the production cost is also increased accordingly; (2) the method of boring the inner hole is used to form the inner hole, which not only has low production efficiency and poor precision, but also has large inter-individual deviations. It is not only difficult to guarantee the size and accuracy of the final product, but also the loss of the mold is large, and the production cost is increased; (3) annealing treatment will form a layer of oxide layer on the surface of the workpiece, annealing Carry out phosphorus saponification treatment directly afterward, the effect of phosphating can be relatively poor, and the thickness of the phosphate layer formed is uneven, and overall is relatively thin, can affect the density distribution and overall homogeneity of finished product; (4) twice annealing treatment and phosphorus saponification The process is not only cumbersome, but also increases the production cost accordingly

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