Vehicle universal joint fork overall part cold extrusion compression molding process

A universal joint fork and press forming technology, applied in the field of auto parts manufacturing, can solve the problems of stress deformation of parts, low product qualification rate, high crack rejection rate, and achieve the effect of improving strength, high dimensional accuracy and protecting molecular structure.

Active Publication Date: 2019-02-19
岑重英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the welding process of parts such as the spline shaft, the spline sleeve and the universal joint yoke, it is easy to cause stress deformation, false welding, and missing welding between the parts, resulting in defects such as weak welding, leaving a safety gap. Hidden danger
In addition, the extrusion of the universal joint yoke usually adopts the process of heating and extrusion. First, the material is flattened for shot blasting, heated, extruded and then shot blasted; At last, the holes are formed after aligning the extruded splines, burr treatment and holes on both sides. However, this process is to heat the universal joint yoke and then extrude and extract the teeth in stages, resulting in rough material surface and lower precision; The secondary extrusion changes the internal molecular structure of the product, forming an invisible fracture surface, resulting in a high crack rejection rate and a low product qualification rate

Method used

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  • Vehicle universal joint fork overall part cold extrusion compression molding process
  • Vehicle universal joint fork overall part cold extrusion compression molding process
  • Vehicle universal joint fork overall part cold extrusion compression molding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A cold extrusion press forming process for an integral part of an automobile universal joint fork, specifically comprising the following steps:

[0044] Step 1, cutting and blanking: cutting and blanking the round bar into required size; the HRB hardness of the round bar is 90 degrees;

[0045] Step 2, annealing: Put the cut bar into the box-type annealing furnace and heat it to 800 degrees, then keep it warm for 2 hours, and then release it when it is cooled to 550 degrees with the box-type annealing furnace, and then air-cool to room temperature; HRB after annealing Hardness at 78 degrees;

[0046] Step 3. Shot blasting: Put the product into the shot blasting machine, use No. 80 steel grit, and blast it for 18 minutes to remove the oxide layer and a small amount of burrs on the surface;

[0047] Step 4, phosphorus saponification treatment:

[0048] Step 4-1. First, wash the workpiece after shot blasting with water and put it in a phosphating solution at 65 degrees C...

Embodiment 2

[0061] A cold extrusion press forming process for an integral part of an automobile universal joint fork, specifically comprising the following steps:

[0062] Step 1, cutting and blanking: cutting and blanking the round bar into required size; the HRB hardness of the round bar is 90 degrees;

[0063] Step 2, annealing: Put the cut bar into the box-type annealing furnace and heat it to 800 degrees, then keep it warm for 2 hours, and then release it when it is cooled to 550 degrees with the box-type annealing furnace, and then air-cool to room temperature; HRB after annealing Hardness at 78 degrees;

[0064] Step 3. Shot blasting: Put the product into the shot blasting machine, use No. 80 steel grit, and blast it for 18 minutes to remove the oxide layer and a small amount of burrs on the surface;

[0065] Step 4, phosphorus saponification treatment:

[0066] Step 4-1. First, wash the workpiece after shot blasting with water and put it into a phosphating solution at 55 degrees...

Embodiment 3

[0079] A cold extrusion press forming process for an integral part of an automobile universal joint fork, specifically comprising the following steps:

[0080] Step 1, cutting and blanking: cutting and blanking the round bar into required size; the HRB hardness of the round bar is 90 degrees;

[0081] Step 2, annealing: Put the cut bar into the box-type annealing furnace and heat it to 800 degrees, then keep it warm for 2 hours, and then release it when it is cooled to 550 degrees with the box-type annealing furnace, and then air-cool to room temperature; HRB after annealing Hardness at 78 degrees;

[0082] Step 3. Shot blasting: Put the product into the shot blasting machine, use No. 80 steel grit, and blast it for 20 minutes to remove the oxide layer and a small amount of burrs on the surface;

[0083] Step 4, phosphorus saponification treatment:

[0084] Step 4-1. First, wash the workpiece after shot blasting with water and put it in a phosphating solution at 55 degrees C...

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Abstract

The invention relates to a vehicle universal joint fork overall part cold extrusion compression molding process. The process comprises specific steps of (1) cutting and blanking, (2) annealing, (3) shot blasting, (4) phosphorus saponification, (5) hydraulic forging: a hydraulic forging machine is used for cold extrusion, (6) finishing, (7) heat treatment, (8) sand blasting, (9) anti-rust treatmentand (10) earhole grinding. Vehicle universal joint fork overall parts prepared by adopting the process are high in surface quality, high in size precision, high in strength, long in service life andlow in crack rejection rate.

Description

technical field [0001] The invention belongs to the field of auto parts manufacturing, and in particular relates to a cold extrusion pressing molding process for an integral part of an auto universal joint yoke. Background technique [0002] At present, the steering column shaft fork of an automobile is usually composed of a spline shaft, a spline sleeve and a universal joint fork. The traditional processing method is as follows: firstly, the spline shaft, spline sleeve and universal joint yoke are processed separately; secondly, the processed spline shaft, spline sleeve and universal joint yoke are respectively welded and formed. However, during the welding process of parts such as the spline shaft, the spline sleeve and the universal joint yoke, it is easy to cause stress deformation, false welding, and missing welding between the parts, resulting in defects such as weak welding, leaving a safety gap. Hidden danger. In addition, the extrusion of the universal joint yoke ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 岑重英
Owner 岑重英
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