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Primary Forming Die for External Gear with Inner Curved Cavity

A technology of external gears and internal curved surfaces, applied in the direction of metal extrusion dies, etc., can solve problems such as unstable coaxiality changes, low processing efficiency, complex shapes, etc., and achieve the effect of stable processing quality and high production efficiency

Active Publication Date: 2011-12-21
无锡市神力齿轮冷挤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex shape of the inner surface cavity 18, it is difficult to process and locate, the change of coaxiality is unstable, the coaxiality cannot meet the requirements of the drawing, and the processing efficiency is low

Method used

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  • Primary Forming Die for External Gear with Inner Curved Cavity
  • Primary Forming Die for External Gear with Inner Curved Cavity
  • Primary Forming Die for External Gear with Inner Curved Cavity

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Embodiment Construction

[0012] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0013] Figure 1~Figure 3 Among them, it includes the upper mold base 1, the punch pad block 2, the upper mold base 3, the punch fixing sleeve 4, the upper mold pressing plate 5, the upper punch 6, the concave template 7, the external gear workpiece 8, the external tooth template 9, the lower Punch 10, lower punch fixing plate 11, lower mold backing plate 12, lower template 13, ejector rod 14, ejector device 15, lower mold base 16, lower mold pressing plate 17, inner curved cavity 18, inner hole 19 , External teeth 20, etc.

[0014] Such as figure 1 , figure 2 and image 3 As shown, the present invention is a primary forming die for an external gear with an inner curved cavity, including an upper die and a lower die. The upper mold includes an upper mold base 3 fixed under the upper mold base 1 and an upper punch 6 installed in the upp...

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PUM

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Abstract

The invention relates to a one-time forming die for an external gear with an internal curved surface cavity. The die comprises an upper die and a lower die, wherein the upper die comprises an upper die seat and an upper male die arranged in the upper die seat; the lower die comprises a lower die seat and a lower male die, an external tooth die plate and a female die plate which are fixed in the lower die seat in turn; a jacking device is arranged below the lower male die; the theoretical area of the lower male die is the difference between the area of the upper male die and the tooth shape area of the external tooth die plate; and the actual area of the lower male die changes in the range of +0.5 percent to -0.5 percent of the theoretical area of the lower male die. The upper and lower flow velocities of a material during cold extrusion are adjusted to be basically consistent by adjusting the area of the lower male die, so that the cold extrusion forming of the external gear and the internal curved surface cavity can be finished at one time; and production efficiency is high, and processing quality is stable.

Description

technical field [0001] The invention relates to a cold extrusion forming die, in particular to a primary forming die for an external gear with an inner curved cavity. Background technique [0002] Such as figure 2 and image 3 The external gear workpiece 8 shown has an inner curved cavity 18 at one end, and an outer tooth 20 and an inner aperture 9 at the other end. After the external gear 8 is cold-extruded, the inner curved cavity 18 and the outer teeth 20 are no longer processed, so the relative position requirements must directly meet the requirements of the drawings, and generally the coaxiality is within 0.08 or even higher. During the cold extrusion process, since the deformation area of ​​the outer teeth 20 is different from that of the inner curved cavity 18, the material flow speed is also different, and one end of the faster flow will be formed first, while the other end cannot be formed. If adopt earlier cold extruding to form inner curved surface die cavity 1...

Claims

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Application Information

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IPC IPC(8): B21C25/02
Inventor 黄伟平
Owner 无锡市神力齿轮冷挤有限公司