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Flexible die forming method with approximatively equal wall thickness for variable-diameter part

A technology of equal wall thickness and parts, applied in the field of soft mold forming of variable-diameter parts, can solve the problems of thinning wall thickness and uneven wall thickness distribution, and achieve easy sealing, improve wall thickness distribution uniformity, and good fluidity. Effect

Active Publication Date: 2012-12-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of thinning wall thickness and uneven distribution of wall thickness in one-time forming existing in the forming of variable diameter parts, and to provide a room temperature forming method of soft mold with nearly equal wall thickness for variable diameter parts

Method used

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  • Flexible die forming method with approximatively equal wall thickness for variable-diameter part
  • Flexible die forming method with approximatively equal wall thickness for variable-diameter part
  • Flexible die forming method with approximatively equal wall thickness for variable-diameter part

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine Figure 1-Figure 5 and Figure 7 To illustrate, a room-temperature forming method of a variable-diameter part with a near-equal wall thickness soft mold is completed by the following steps:

[0016] Step 1: The mold is composed of an upper mold 3 and a lower mold 1, and the cavity of the mold is composed of the cavity of the upper mold 3 and the cavity of the lower mold 1, and the tube blank 2 is installed on the cavity of the upper mold 3 and the lower mold 1 In the mold cavity, there is a distance between the upper mold 3 and the lower mold 1, the upper end of the lower plunger 7 is provided with an upper boss 7-1, the upper end of the lower plunger 7 is arranged in the cavity of the lower mold 1, and the The upper convex shoulder of the lower plunger 7 is in sealing contact with the lower end surface of the tube blank 2, and the upper boss 7-1 of the lower plunger 7 is pressed into the tube blank 2;

[0017] Step 2: Place a...

specific Embodiment approach 2

[0024] Embodiment 2: The viscoelastic plastic material 5 in step 3 of this embodiment is a polymer material with a molecular weight of 400000g / mol~600000g / mol and a viscosity of 10000Pa·s~16000Pa·s, the viscoelastic plastic material 5 The state of matter is semi-solid. The strain rate sensitivity of the viscoelastic plastic material is better, it is more suitable for the change of the stress during the deformation process of the shell, and it can better suppress the wrinkling that may occur during the forming process. Other method steps are the same as those in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: In step 6 of this embodiment, the wall thickness of the manufactured variable diameter part is 1-6mm. Other method steps are the same as those in the first or second embodiment.

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Abstract

The invention provides a flexible die forming method with approximatively equal wall thickness for a variable-diameter part, which relates to a flexible die forming method of a variable-diameter part. The invention is used for solving the problems of wall thickness reduction and uneven distribution of the wall thickness because of one-step forming, which exist in the forming of a traditional variable-diameter part. The method comprises the following main steps of: putting a cylinder blank into a die cavity of a die and putting a mandrel into the cylinder blank; filling a sticky and elastic plastic material; sealing; combining the die; jointing the cylinder blank and the die cavity of the die tightly under the pressure action of the sticky and elastic plastic material inside the cylinder blank and the pressure of the die and forming; sinking the die and taking out the formed variable-diameter part; and removing the mandrel and eliminating the residual sticky and elastic plastic material inside the variable-diameter part. The wall thickness of the variable-diameter part manufactured by the method is even, the forming limit of the variable-diameter part is enhanced, the distribution of the wall thickness of the variable-diameter part is improved, the surface quality of the variable-diameter part is enhanced, and the manufacturing cost of the variable-diameter part is also lowered. The method is used for forming the variable-diameter part.

Description

technical field [0001] The invention relates to a method for forming soft molds of parts with variable diameters, and belongs to the technical field of plate forming. Background technique [0002] Shell parts with relatively large variable diameters are widely used in aviation, aerospace, automobiles and other fields. The current main forming method for such parts is "split forming and combined welding". Dimensional accuracy is affected by each separate forming process, quality control is difficult, and manufacturing costs are increased, which cannot meet the increasingly higher requirements for dimensional accuracy, surface quality, and manufacturing efficiency of variable diameter shell parts. Other one-time forming technologies such as spinning forming and hydroforming are difficult to obtain good wall thickness distribution, which limits the further improvement of the reduction ratio of parts. Under the premise of ensuring a large diameter reduction ratio, reducing the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C43/02B29C43/36
Inventor 王忠金胡泊
Owner HARBIN INST OF TECH
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