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Cold extruding forming method used for automotive spline sleeve part

A spline sleeve and cold extrusion technology are applied in the direction of metal extrusion, metal extrusion dies, metal extrusion control equipment, etc., which can solve the problems of bending resistance, unsatisfactory shear strength, poor density of powder metallurgy tooth structure, The problem of low material utilization rate can solve the problem of dissatisfaction with metal mold filling, good mechanical properties of parts, and high material utilization rate.

Inactive Publication Date: 2016-08-24
SHANGHAI UNIV OF ENG SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the spline teeth are processed by cutting, the fibers of the tooth-shaped part are cut off by the broach, which reduces the strength of the spline and affects its load-carrying capacity, and the material utilization rate is low, the working cycle is long, and the production cost is high. Facing fierce market competition , the traditional method of cutting splines is becoming more and more stretched
The second method is powder metallurgy forming. Although powder metallurgy technology can be used to realize the industrialization of some spline parts, but because this method is to press the metal powder into the shape of the required part, and then sinter it at high temperature. In this process, the metal material is not rolled to form a metal fiber flow, which is a non-oriented mechanical property, which makes the structure density of the powder metallurgy tooth profile poor, and the bending and shearing strengths are not ideal.
According to the law of least resistance in plastic forming, it can be known that when the punch exerts pressure on the metal blank placed in the die, the metal flows upward and downward, and the deformed metal flows preferentially to the part with the least resistance, and the fast-flowing metal flows first. Because the slow-flowing metal contacts the ejector rod; therefore, when the spline sleeve is formed by the ordinary extrusion method, because the metal at the end of the cylinder flows faster than the metal at the spline teeth, mold is prone to appear at the tooth profile The cavity is not filled enough to cause defects, so that the products produced cannot meet the design requirements

Method used

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  • Cold extruding forming method used for automotive spline sleeve part
  • Cold extruding forming method used for automotive spline sleeve part
  • Cold extruding forming method used for automotive spline sleeve part

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A cold extrusion forming method of a spline sleeve part for a vehicle, the part structure is as follows image 3 As shown, the forming process is as figure 1 As shown, it includes blanking, annealing, shot blasting, lubrication treatment, one-time extrusion forming of internal and external teeth, back pressure device forming circular arc tooth ends and other processes. The specific steps are as follows:

[0030] (1) Prepare the spline sleeve blank;

[0031] (2) Annealing to soften the blank; the process conditions are: under the protection of nitrogen atmosphere, heat preservation at 860°C for 8 hours, and then cool with the furnace to below 450°C;

[0032] (3) Shot blasting treatment to eliminate burrs and oxide scales on the surface of the blank (shot blasting):

[0033] The process conditions are: use pellets with a diameter of 0.6-1.0mm to treat for 10 minutes, so that the surface of the blank has no scale and the surface of the rust is bright and uniform;

[003...

Embodiment 2

[0042] A cold extrusion forming method of a spline sleeve part for a vehicle, the part structure is as follows Figure 4 As shown, the forming process specifically includes the following steps:

[0043] (1) Prepare blank;

[0044] (2) Annealing and softening;

[0045] The process conditions are: under the protection of nitrogen atmosphere, heat preservation at 880°C for 7 hours, and then cool down to below 450°C with the furnace;

[0046] (3) Shot blasting treatment;

[0047] The process conditions are: use pellets with a diameter of 0.6-1.0mm to treat for 18 minutes, so that the surface of the blank has no scale and the surface of the rust is bright and uniform;

[0048](4) Lubrication treatment;

[0049] The process conditions include the following steps in turn: degreasing for 7 minutes, cold water washing for 0.8 minutes, hot water washing for 0.8 minutes, pickling for 8 minutes, cold water washing for 0.8 minutes, hot water washing for 0.8 minutes, phosphating for 12 ...

Embodiment 3

[0056] A cold extrusion forming method of a spline sleeve part for a vehicle, the part structure is as follows Figure 5 As shown, the forming method specifically includes the following steps:

[0057] (1) Blanking;

[0058] (2) Annealing;

[0059] The process conditions are: under the protection of nitrogen atmosphere, heat preservation at 900°C for 7 hours, and then cool to below 450°C with the furnace;

[0060] (3) shot blasting;

[0061] The process conditions are: use pellets with a diameter of 0.6-1.0mm to treat for 25 minutes, so that the surface of the blank has no scale and the surface of the rust is bright and uniform;

[0062] (4) lubrication;

[0063] The process conditions include the following steps in turn: degreasing for 10 minutes, cold water washing for 1 minute, hot water washing for 1 minute, pickling for 10 minutes, cold water washing for 1 minute, hot water washing for 1 minute, phosphating for 15 minutes, cold water washing for 1 minute, hot water wa...

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Abstract

The invention relates to a cold extruding forming method used for an automotive spline sleeve part. The spline sleeve is in an axisymmetrical cylinder shape. Axial involute spline tooth are formed in the inner surface of the body of a cylinder and the outer surface of the body of the cylinder. The end surfaces of outer spline tooth are in an arc shape. The method comprises the following steps: (1) preparing billets of the spline sleeve part; (2) annealing the billets to soften the billets; (3) conducting slot blasting treatment of the annealed billets to remove burrs and scale; (4) conducting lubricating treatment of the billets which is subjected to the slot blasting treatment; (5) conducting extruding and forming treatment of the billets which is treated by step (4) to make inner spline tooth and the outer spline tooth be extruded and formed all at once; (6) forming the arc-shaped end surfaces of the outer spline tooth by using a back pressure device. Compared with the prior art, the spline sleeve part produced by utilizing the cold extruding forming method has the advantages that the mechanical property is good, the material utilization rate is high, the defect that tooth-shaped die cavity can not be fully filled can be avoided and the production process flow is short.

Description

technical field [0001] The invention relates to the technical field of plastic processing of metal materials, in particular to a cold extrusion forming method of a spline sleeve part for a vehicle. Background technique [0002] Splines are widely used in various transmission systems due to their advantages of ensuring a constant transmission ratio, wide range of transmission efficiency, high efficiency, and long life. The density, hardness and performance of spline teeth are closely related to the production process. At present, there are three common forming methods for such parts: one is cutting processing, the other is powder metallurgy technology die-casting, and the third is plastic forming. [0003] When the spline teeth are processed by cutting, the fibers of the tooth-shaped part are cut off by the broach, which reduces the strength of the spline and affects its load-carrying capacity, and the material utilization rate is low, the working cycle is long, and the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/03B21C23/32B21C25/02B21C31/00C21D9/32C21D1/26C23C22/73
CPCB21C23/03B21C23/32B21C25/02B21C31/00C21D1/26C21D9/32C23C22/73
Inventor 龚红英黄继龙宋春雨吕弘毅邹琼琼廖泽寰
Owner SHANGHAI UNIV OF ENG SCI
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