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Method for designing gear forging die by three-order non-uniform rational B-splines

A non-uniform and rational gear technology, applied in the direction of wheels, vehicle parts, metal processing equipment, etc., can solve the problems of long production cycle and high production cost, and achieve the effects of reducing production man-hours, saving forging die costs and increasing flexibility

Inactive Publication Date: 2013-04-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings of multiple processes, multiple sets of forging dies, long production cycle and high production cost in the prior art, the present invention proposes a method for designing gear forging dies using third-order non-uniform rational B-splines

Method used

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  • Method for designing gear forging die by three-order non-uniform rational B-splines
  • Method for designing gear forging die by three-order non-uniform rational B-splines

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Embodiment 1

[0029] This embodiment is a method for designing a forging die of a gear forging by using a third-order non-uniform rational B-spline. The gear forging die is used to produce figure 1 (b) Gear forging shown. The gear forging is a typical short-shaft forging, which is composed of three parts: the hub, the spoke plate and the rim. According to the diameter and height of the gear forging hub and rim, the type value point of the third-order non-uniform rational B-spline curve is determined. Through This type of value point establishes a third-order non-uniform rational B-spline curve.

[0030] The gear forging die described in this embodiment includes a final forging die chamber and a forming and upset die chamber. The specific design process includes the following steps:

[0031] Step 1 Design the final forging die cavity. According to the design method of the final forging die chamber in the forging manual, design the final forging die chamber according to the gear forging. ...

Embodiment 2

[0051] This embodiment is a method for designing a forging die of a gear forging by using a third-order non-uniform rational B-spline. The gear forging die is used to produce figure 1 (b) Gear forging shown. The gear forging is a typical short-shaft forging, which is composed of three parts: the hub, the spoke plate and the rim. According to the diameter and height of the gear forging hub and rim, the type value point of the third-order non-uniform rational B-spline curve is determined. Through This type of value point establishes a third-order non-uniform rational B-spline curve.

[0052] The gear forging die described in this embodiment includes a final forging die chamber and a forming and upset die chamber. The specific design process includes the following steps:

[0053] Step 1 Design the final forging die cavity. According to the design method of the final forging die chamber in the forging manual, design the final forging die chamber according to the gear forging. ...

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Abstract

A method for designing a gear forging die by three-order non-uniform rational B-splines includes: determining feature points K1, K2, K3 and K4 representing symmetrical basic shape of a gear forging shaft, and using the feature points as basis for the design of three-order non-uniform ration B-spline cures and surfaces for the gear forging die; allowing the contour profile of a formed upsetting impression to be curves when determining the shape of the formed upsetting impression, and allowing points of segments in the curves of the formed upsetting impression to correspond to the feature points K1, K2, K3 and K4 of a gear forging respectively. The complex process of preforming, upsetting and final forging for the gear forgings is simplified, performing of the complex gear forgings can be completed by two procedures, single heating and one tool set, and accordingly cost is effectively lowered and work efficiency is improved.

Description

technical field [0001] The invention relates to the field of forging die design for thermal processing of metal materials, in particular to a method for designing a forging die for a gear forging by using a third-order non-uniform rational B-spline. Background technique [0002] Preforming is the process of using a forging die to gradually deform a simple shape of the original blank to obtain a blank shape suitable for forming complex forgings. At present, the fact that forming defects such as excessive flash, unreliable punching, insufficient filling, and folding often occur in traditional die forging production shows that the preformed blank / die cavity designed according to the traditional die forging process design method cannot better adapt to complex The basic shape characteristics of forgings and the volume distribution characteristics of materials cannot better reflect the flow laws of metal materials. According to statistics, the flash material consumption of open d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/30B21J13/02
Inventor 冀国良李付国袁战伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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