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Narrowing device for ultra-thin-walled cylindrical parts and application method thereof

An ultra-thin-walled, cylindrical technology, applied in the direction of metal processing equipment, forming tools, manufacturing tools, etc., can solve the problems of instability, wrinkling, wrinkling, etc., to save processing costs, low manufacturing costs, and avoid longitudinal failure Effects of stable wrinkling and transverse destabilization wrinkling defects

Active Publication Date: 2017-06-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a necking device for ultra-thin-walled cylindrical parts in order to solve the problem of wrinkling caused by shrinking of ultra-thin-walled cylindrical parts, especially when the necking ratio is too large, it is easy to cause instability and wrinkling and its application method

Method used

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  • Narrowing device for ultra-thin-walled cylindrical parts and application method thereof
  • Narrowing device for ultra-thin-walled cylindrical parts and application method thereof
  • Narrowing device for ultra-thin-walled cylindrical parts and application method thereof

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specific Embodiment approach 1

[0031] Specific embodiment 1: The necking device of the ultra-thin-walled cylindrical part in this embodiment includes a mold base 1, an outer wall support soft mold 3, an inner wall support soft mold 8, a connecting rod 4-1, a cylinder opening support soft mold 5, a positioner 6 and Shrinking die 7, wherein the lower end of the connecting rod 4-1 is connected with a conical rigid core 4-2, the rod body of the connecting rod 4-1 is provided with external threads, the mold base 1 is a concave half-cavity structure, and the cylindrical part 2 Set in the concave cavity of the mold base 1, an annular groove 1-1 is opened on the cavity wall of the mold base 1, and the outer wall with a "T"-shaped longitudinal section supports the soft mold 3 and is embedded in the annular groove 1-1 of the mold base 1 In the center of the outer wall supporting soft mold 3, there is a round hole with the same outer diameter as the cylindrical piece 2, and the inner wall supporting soft mold 8 compose...

specific Embodiment approach 2

[0033] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the mouth support soft mold 5, the inner wall support soft mold 8 and the outer wall support soft mold 3 are made of insulating resin, polyurethane, soft rubber, polypropylene or silicone material .

specific Embodiment approach 3

[0034] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the height h of the outer straight wall of the mouth support soft mold 5 is not less than the height of the mouth straight wall of the cylindrical part 2 after shrinking.

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Abstract

The invention provides a necking device of an ultrathin-wall cylindrical part and an application method of the necking device. The necking device of the ultrathin-wall cylindrical part and the application method of the necking device, provided by the invention, aim at overcoming the defect that the ultrathin-wall cylindrical part is wrinkled when being necked. The necking device of the ultrathin-wall cylindrical part, provided by the invention, comprises a die base, an outer wall supporting soft die, an inner wall supporting soft die, a connection rod, a barrel opening supporting soft die, a positioning device and a necking die; the lower end of the connection rod is connected with a rigid core; the cylindrical part is arranged in a concave cavity of the die base; the outer wall supporting soft die is embedded into the die base; the cylindrical part is internally provided with the inner wall supporting soft die; an outer wall of the inner wall supporting soft die is fitted with an inner wall of the cylindrical part; the barrel opening supporting soft die is fixed by the positioning device so that the upper end face of the barrel opening supporting soft die is leveled with a barrel opening of the cylindrical part; and the necking die is arranged above the barrel opening of the cylindrical part. By utilizing a common clamping effect of the outer wall supporting soft die and the inner wall supporting soft die, the necked cylindrical part is prevented from having defects including longitudinal unstable wrinkling and transverse unstable wrinkling.

Description

technical field [0001] The invention relates to a necking device and an application method of a cylindrical part, in particular to a necking device and a processing method of an ultra-thin-walled cylindrical part. Background technique [0002] Ultra-thin-walled cylindrical parts usually refer to cylindrical parts with a ratio of cylinder diameter to cylinder wall thickness greater than 100. Such parts are widely used in aerospace and other fields, such as fuel delivery system pipelines, engine housing structures, etc. Necking is a forming process in which the diameter of the mouth of a pre-drawn semi-closed cylindrical part is reduced to a certain size through a shrinking die. During shrinkage forming, the deformation zone of the cylinder mouth and the force transmission zone of the cylinder wall are mainly affected by two-dimensional compressive stress, in which the circumferential compressive stress makes the diameter of the cylindrical part shrink, and the axial compressi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D41/04B21D37/10
CPCB21D37/10B21D41/04
Inventor 刘伟徐永超苑世剑
Owner HARBIN INST OF TECH
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