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: 2009-06-24
SHANGHAI AUTOMOBILE GEAR WORKS
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Problems solved by technology
Its shortcoming is: in the roll forging billet process, can produce two material heads (such as figure 2 shown), the material utilization rate has not been effectively improved
Method used
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[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] Such as image 3 As shown, 1 is bar stock, and 2 is 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 ...
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Abstract
The invention relates to a method for forging a shift fork of an automobile part, belonging to the technical field of forging. In the present invention, after heating in the prior art, two steps of billet making and bending are added, and then pre-forging, final forging, edge trimming and finishing are performed. For the billet making, the heated billet is rolled by flat plate cross wedge rolling. For billet making, the forming range of section shrinkage rate is: 40% to 65%; the range of forming angle a is: 18°≤a≤32°; the range of broadening angle b is: 4°≤b≤12°; the bending, The blank is bent twice by the press. The shape after the second bending is the result of inverse calculation from the shape and size of the product, but the inner arc of the bending is smaller than the inner arc of the product; the outer arc of the bending is larger than the outer arc of the product ; The calculation of the first bending is based on the result of inversion of the shape after the second bending. The length of one side of the shape after the second bending is the distance between one end and the positioning point during the first bending. The invention can save product materials and improve the service life of product molds.
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 (such as figure 1 Shown): Two slender arc feet with a conical boss at their junction. 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 ...
Claims
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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