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Shifting fork forging method of auto parts

A technology for auto parts and final forging, applied in the field of forging, can solve the problem that the utilization rate of materials is not effectively improved, and achieve the effect of reducing the impact force of the equipment

Inactive Publication Date: 2007-08-01
SHANGHAI AUTOMOBILE GEAR WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its shortcoming is that in the process of roll forging billet, there will be two material heads (as shown in Figure 2), and the material utilization rate has not been effectively improved.

Method used

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Embodiment Construction

[0022] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0023] As shown in Figure 3, 1 is a bar, and 2 is a cross-rolled plate. For the cross-rolling process used in blank making, there are three main parameters: reduction of area, forming angle a, and widening angle b. Reduction of area is the ratio of the area before billet minus the area after billet to the area before billet. Its favorable area reduction rate is 40% to 65%. As for the forming angle a and the widening angle b, they are the two most important and basic parameters in the design of the cross rolling process. Generally, it is selected within the followin...

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Abstract

A vehicle parts shifting fork forging method belongs to forging technology field. The invention adds two steps of producing blanks and bending after heating of prior technologies, then pre-forging, final forging, trimming and fine finishing. Said producing blank step produces blanks with the heated blank materials using plate wedge cross rolling, the shaping range of reduction of cross-sectional area is : 40%-65%; the shaping angle a range is: 18degree<=a<=32degree; the stretching angle b range is: 4degree<=b<=12degree; said bending step bends the blanks twice through the press machine, the shape after second bend is the contra-outcome from product shape size, but the bend inner arc of size is smaller than product inner arc; the bend outer arc of size is bigger than product outer arc; the first bend calculation is inversion result according the shape after second bend, the length after the second bend shape one side expansion just is the distance between one end and positioning point when first bending. The invention can save products materials and improve product mold life.

Description

technical field [0001] The invention relates to a method in the technical field of forging, in particular to a method for forging a shift fork of auto parts. Background technique [0002] The shift fork is a key part of the car. Due to the particularity of its shape and the importance of its performance, it is difficult to forge it. The shape of the forging (as shown in Figure 1): two slender arc feet with conical bosses at their junctions. Due to the large openings of the two arc feet, careful consideration must be given to the distribution of materials and the selection of processes. For this reason, the development of reasonable forging methods for such forgings has also attracted attention both at home and abroad. [0003] At present, the conventional technological process of forgings in China is: heating, pre-forging, final forging, edge trimming, and finishing. The disadvantages of this solution are: a large-tonnage press is required, high energy consumption, low ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P13/00B21B1/02B21B37/00B21D11/00B21J5/06B21K1/74F16H63/32
Inventor 孙佳佳张丹华张海英
Owner SHANGHAI AUTOMOBILE GEAR WORKS
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