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Rotary fine-stamping mold and method for helical cylindrical gear

A technology of helical cylindrical gear and fine blanking, which is applied in the directions of wheels, manufacturing tools, transportation and packaging, etc. It can solve the problems affecting the quality of fine blanking parts and the large tear zone of fine blanking parts, so as to improve quality and eliminate tearing Belt, enhance the effect of three-dimensional compressive stress

Inactive Publication Date: 2017-06-20
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the fine blanking process, due to the rotation of the material when it enters the cavity of the concave mold, as this complex deformation proceeds gradually, the stress state of the area where shear plastic deformation occurs will prematurely change from the stress state of the three-dimensional compressive stress The stress state of the tensile stress makes the cracks in this area generate and expand in advance, and finally the tear zone of the fine blanking parts is too large, which affects the quality of the fine blanking parts

Method used

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  • Rotary fine-stamping mold and method for helical cylindrical gear

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Embodiment 1

[0027] Now adopt the rotary fine blanking forming process to manufacture helical gears with a diameter of 40mm and a thickness of 3.6mm. The selected blank is a circular plate with a diameter of d = 56mm and a thickness of h = 4mm. The value of the unilateral gap is set to Δx ≤0.1mm, take Δh=0.4mm.

[0028] First, place the blank in the positioning groove on the die, press the platen down to press the blank, and under the action of the blank holder force, upset the blank downward by 0.4mm. The upsetting blank presses the groove wall tightly, and uses the reaction force of the groove wall to apply radial force to the upsetting blank. Die direction flow. The lower end surface of the pressing plate cannot touch the upper end surface of the die to ensure that the blank holder force is fully applied to the blank. Keep the blank-holding force of the pressing plate, and at the same time, the reverse ejector rod presses the upset blank with the reverse force, and the punch punches t...

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Abstract

The invention provides a rotary fine-stamping mold and method for a helical cylindrical gear. According to the rotary fine-stamping method, a blank is subjected to upsetting by utilizing a press plate; when the blank flows radially, the radial flow of the blank is stopped by the groove wall of a compression groove in the press plate; and meanwhile, the radial force is applied to the blank by utilizing the reacting force, so that the three-dimensional compressive stress during the formation of a common rotary fine-stamping helical cylindrical gear is enhanced, and then the hydrostatic stress distribution state in a fine-stamping process is improved. By adoption of the rotary fine-stamping mold and method provided by the invention, the too early appearance of the tensile stress in a shear plasticity and deformation region in the fine-stamping process is effectively controlled, thereby inhibiting the formation in advance and the propagation of cracks, reducing and even eliminating the torn belt of a fine-stamping part, and improving the quality of the fine-stamping part.

Description

technical field [0001] The invention belongs to the technical field of fine blanking, and in particular relates to a rotary fine blanking die and a fine blanking method for helical cylindrical gears. Background technique [0002] As a transmission part, the helical cylindrical gear has the advantages of stable transmission and low noise, and is widely used in the fields of machinery, electronics, aerospace and automobile industries. Using the method of rotary fine blanking to process helical cylindrical gears can not only overcome the shortcomings of low material utilization rate and high cost during mechanical cutting, but also solve the problems of poor material fluidity, difficult filling and poor precision during precision forging. The rotary fine-blanking helical gear is to apply blank-holding force through V-shaped blank-holding ring, reverse-jacking punch to apply reverse-jacking force, and punch to apply main punching force to make the blank under the action of three...

Claims

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Application Information

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IPC IPC(8): B21K1/30B21J13/02
CPCB21K1/30B21J13/02
Inventor 毛华杰郑彬刘艳雄胡俊杰赵新浩
Owner WUHAN UNIV OF TECH
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