Spur gear extrusion concave die

The technology of spur gear and concave die is applied to the extrusion die for extrusion of spur gear. field, to achieve the effect of easy forming and reducing the influence of friction

Inactive Publication Date: 2004-11-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to avoid the shortcomings of the above-mentioned prior art, and to provide a spur gear extrusion with small extrusion force, easy filling of the tooth-shaped part, easy wear of the involute of the concave die, and long service life. die

Method used

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  • Spur gear extrusion concave die
  • Spur gear extrusion concave die
  • Spur gear extrusion concave die

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Embodiment Construction

[0022] See attached figure 1 , The die in this embodiment is from the blank inlet to the formed metal outlet, followed by the guide section 2, the forming section 3, the support section 4 and the die backing plate 5. In the guide section 2 of the die, the diameter of the die entrance should be larger than the diameter of the pitch circle of the forming gear and smaller than the diameter of the addendum circle of the forming gear, and the diameter of the blank should be set accordingly. The unilateral gap between the punch 1 and the guide section 2 of the concave mold is not more than 0.15mm. In order to make the support more effective, the forming section 3 and the support section 4 should be designed as an integral structure.

[0023] figure 2 As shown, the end of the die forming section 4 (shown as the B-C section in the figure), the geometric shape and size of the inter-tooth gap are consistent with the tooth profile of the formed gear plane projection. Including the roo...

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Abstract

The invention is an extrusion concave mould of straight-tooth cylindrical gear, and its character: inlet diameter of the concave mould is greater than the diameter of divided circle of a molded gear and less than that of addendum circle of the molded gear; the shape and size of the gap between teeth at the end of the molding segment of the concave mould are consistent with those of the tooth form of planar projection of the molded gear; for arbitrary cross section in molding segment of the concave mould but point of tangency from the top arc of the tooth form to the side wall between teeth, the geometrical shapes and sizes of the rest parts between teeth are consistent with those of the corresponding parts at the end of the molding segment of the concave mould, and the centre angles opposite to the circumferential pitches are the same. It needs small extruding force, and the parts of tooth form are easy to fill up, the involutes of the concave mould is uneasy to wear and its service life is long.

Description

Technical field: [0001] This invention relates to extrusion dies for metal extrusion. More particularly, an extrusion die for the extrusion of spur gears, in particular. Background technique: [0002] The main problems of the spur gear extrusion dies commonly used at present are the large extrusion force during the extrusion molding process, the difficulty of filling the tooth profile, and the large wear of the involute part of the concave die. Invention content: [0003] The problem to be solved by the present invention is to avoid the shortcomings of the above-mentioned prior art, and to provide a spur gear extrusion with small extrusion force, easy filling of the tooth-shaped part, easy wear of the involute of the concave die, and long service life. die. [0004] The technical scheme adopted in the present invention is: [0005] a. The diameter of the entrance of the concave die is larger than the diameter of the pitch circle of the forming gear and smaller than the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02
Inventor 刘永熙王强杜晓东
Owner HEFEI UNIV OF TECH
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