Cold precision forming device for asymmetric cylindrical gear

Abstract

The invention discloses a cold precision forming device for an asymmetric cylindrical gear. The device comprises a lower die holder which is arranged on a base, a mobile female die which is positioned above the lower die holder, and an upper die holder which is arranged above the mobile female die, wherein a lower built-in oil cylinder and a lower external punching head with a hollow cylindrical structure are sequentially arranged in the lower die holder from bottom to top, and a lower internal punching head is arranged in a hollow cylindrical cavity of the lower external punching head; the mobile female die consists of a movable crossbeam and a forming female die which is arranged in a cavity at an intermediate position of the movable crossbeam, and two ends of the movable crossbeam are respectively combined with oil cylinders which are vertically arranged on two sides of the lower die holder and are used for controlling the vertical displacement of the movable crossbeam; an upper built-in oil cylinder and an upper external punching head with a hollow cylindrical structure are sequentially arranged in the upper die holder from top to bottom, and an upper internal punching head is arranged in a hollow cylindrical cavity of the upper external punching head; and the forming female die, the upper and lower external punching heads, and the upper and lower internal punching heads are arranged in a coaxial mode.

Description

technical field [0001] The invention belongs to a cold precision forming process and a device thereof in the machinery manufacturing industry, in particular to an asymmetric cylindrical gear cold precision forming device, which is suitable for the production of asymmetrically shaped gears. Background technique [0002] At present, gears with large H / D (height H and diameter D) can be solved by forward extrusion method, which is not difficult in engineering, but most of cylindrical gears are flat, generally H / D<1 / 2~1 / 10, while For flat gears, only toothed punches can be used to upset the blank in the toothed die, so that the blank can flow radially and form it, such as figure 1 As shown, since the tooth shape of the die 7 is gradually narrowed, it is quite difficult to fill the tooth shape with radial flow, or a relatively high compressive stress (up to 3000-4000Mpa) is required, so that the mold cannot bear it. The maximum allowable stress of cold forging dies is general...

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Problems solved by technology

Since the above-mentioned patent is a constant-velocity two-way extrusion, the shape of the formed gear is symmetrical up and down, so this method is more suitable for forming a vertically symmetrical gear, but in actual production and application, a relatively large part of the gear is asymmetrical up and down , so further research is required

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