Viscoelasto-plastic soft mode forming method of minor-radius corrugated surface thin-wall metal barrel part

A small radius, metal cylinder technology, applied in the field of sheet metal forming, can solve the problems of inability to adapt to changes in stress during deformation, uneven wall thickness distribution of formed parts, poor surface quality of formed parts, etc., to prevent cracks, improve surface quality, The effect of suppressing the rebound

Active Publication Date: 2010-11-17
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 provide a viscoelastic-plastic soft mold forming method for small-radius corrugated curved surface thin-walled metal cylinder parts to solve the problem of small corrugation radius and low material strength when using room temperature rigid die stamping or thermoforming thin-walled and ultra-thin wall thickness. The high metal bellows has the problem of uniform pressure distribution on the surface of the blank, which cannot adapt to the change of stress during the deformation process, and the wall thickness of the formed part is unevenly distributed, and the local area is easy to break, and the surface quality of the formed part is poor.

Method used

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  • Viscoelasto-plastic soft mode forming method of minor-radius corrugated surface thin-wall metal barrel part
  • Viscoelasto-plastic soft mode forming method of minor-radius corrugated surface thin-wall metal barrel part
  • Viscoelasto-plastic soft mode forming method of minor-radius corrugated surface thin-wall metal barrel part

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specific Embodiment approach 1

[0025] Specific implementation mode one: combine Figure 1 to Figure 6 Explain that the viscoelastic-plastic soft mold forming method of small-radius corrugated curved surface thin-walled metal cylinder parts in this embodiment is realized in this way:

[0026] 1. Forming the initial small-radius corrugated curved thin-walled metal tube blank, the specific steps are as follows:

[0027] Step 11: Make the primary forming die 1: firstly make the primary die blank, which is composed of two semi-concave blanks 2, and the two semi-concave blanks 2 are fastened and detachably connected; Two small-radius corrugated ring cavities 3 are processed on the inner wall of the primary die blank;

[0028] Step 1 and 2: apply a release agent on the surfaces of the two small-radius corrugated ring cavities 3;

[0029] Step one and three: making core mold 7: machining a counterbore on the central axis of one side end face of cylinder 4 and calling it piston movable chamber 6, and processing a ...

specific Embodiment approach 2

[0044] Embodiment 2: The release agents used in steps 1 and 2 and steps 2 and 2 of this embodiment are all wax-free release agents, which are beneficial for demoulding. Other method steps are the same as those in the first embodiment.

specific Embodiment approach 3

[0045] Embodiment 3: The viscoelastic plastic material 10 in step 16 of this embodiment is a high molecular polymer material with a molecular weight of 400,000 g / mol-600,000 g / mol and a viscosity of 10,000 Pa·s-16,000 Pa·s. With high strain rate sensitivity, non-uniform pressure distribution can be established on the billet surface. Other method steps are the same as those in the first or second embodiment.

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Abstract

The invention discloses a viscoelasto-plastic soft mode forming method of a minor-radius corrugated surface thin-wall metal barrel part, relating to a forming method of a minor-radius corrugated surface thin-wall metal barrel part. The invention is designed aiming at the problems that the metal corrugation barrel with smaller corrugation radius and higher material strength, which has thin wall thickness or with ultrathin wall thickness formed by steel mould stamping forming or hot-forming at room temperature, has even distribution of pressure acting on blank and can not adapt to stress variation in the deformation process, the wall thickness of the forming part is unevenly distributed, and the local area is easy to break. The method comprises the following key points of steps: forming an initial-level minor-radius corrugated surface thin-wall metal barrel blank, and comprises the following steps: manufacturing an initial-level forming die, coating release agent, manufacturing the mandrel, assembling the initial-level forming die and the mandrel, filling viscoelasto-plastic material, installing a piston and an overflow valve, adjusting pressure value, opening the die to take out the formed part, removing the viscoelasto-plastic material remained on the surface of the part, and replacing the forming die. The invention is used for forming the minor-radius corrugated surface thin-wall metal barrel part.

Description

technical field [0001] The invention relates to a method for forming thin-walled metal cylinder parts with small-radius corrugated curved surfaces, and belongs to the technical field of plate forming. Background technique [0002] Metal bellows is a kind of flexible, thin-walled, and transversely corrugated tube and shell parts. It mainly uses its own elastic deformation function to work. In addition to elastic properties, it also has pressure resistance, sealing, corrosion resistance, temperature resistance, It is a multifunctional part with various properties such as impact resistance. Under the action of external force, axial, angular, lateral and combined displacements can be produced. It has been more and more widely used in machinery, instrumentation, petroleum, chemical industry, electric power, automobile, locomotive, ship, aerospace and other industrial fields. For thin-walled and ultra-thin-walled metal bellows with small corrugation radius and high material stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D15/02B21D51/12
Inventor 王忠金李继光
Owner HARBIN INST OF TECH
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