Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode

A technology of pressure control and aluminum alloy, which is applied in the field of pressure control of soft mold forming of aluminum alloy cover parts, can solve the problems of high manufacturing cost, poor surface quality, thinning and cracking, etc., to improve surface quality, prevent cracking, and suppress return The effect of playing

Active Publication Date: 2009-09-23
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 problems of local thinning and cracking, large rebound, poor surface quality and high manufacturing cost in the forming of existing aluminum alloy covering parts, and to provide a viscoelastic-plastic aluminum alloy covering part. Pressure Control Method for Soft Mold Forming

Method used

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  • Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode
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  • Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode

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specific Embodiment approach 1

[0014] Specific implementation mode one: combine Figure 1 to Figure 4 To illustrate this embodiment, the steps of a pressure control method for viscoelastic-plastic soft mold forming of an aluminum alloy cover part in this embodiment are as follows:

[0015] Step 1: first mold the mold, then grind and polish the cavity surface of the concave mold 1 of the mold, apply a release agent on the surface of the upper mold cavity, and then set up a pressure chamber 4 on the upper end surface of the lower mold 7 of the mold, A plurality of piston movable chambers 8 and a plurality of overflow chambers 9 are provided on the bottom surface of the mold 7, the piston movable chambers 8 communicate with the pressure chamber 4, and the overflow chambers 9 communicate with the piston movable chambers 8;

[0016] Step 2: install a plurality of pistons 6 in the piston movable chamber 8, and install a plurality of overflow valves 5 at the outlet end of the overflow chamber 9;

[0017] Step 3: ...

specific Embodiment approach 2

[0022] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the release agent in step 1 of this embodiment is a wax-free release agent. The surface quality of the aluminum alloy cover is better, and it is easier to demould.

specific Embodiment approach 3

[0023] Specific embodiment three: The difference between this embodiment and specific embodiment one or two is: the viscoelastic plastic material 3 in step three of this embodiment has a molecular weight of 400000g / mol~600000g / mol, and a viscosity of 10000Pa·s~ 16000Pa·s polymer material, the state of the viscoelastic plastic material 3 is semi-solid. The viscoelastic-plastic material has better strain rate sensitivity, is more suitable for the change of stress in the deformation process of the aluminum alloy sheet, and better suppresses the springback of the aluminum alloy cover after forming.

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Abstract

The invention discloses a pressure control method for forming an aluminum alloy covering part viscoelastic-plastic soft mode, relating to the pressure control method for forming an aluminum alloy covering part soft mode. The invention solves the problems of local tinning and cracking, larger rebound, bad surface quality and higher manufacture cost which are existed in the prior aluminum alloy covering part. The invention substantially comprises the following steps of: shaping a mould; installing a piston and an overflow valve; filling viscoelastic-plastic materials; matching a mould; adjusting the overflow valve to control the pressure value of the deformed region of the aluminum alloy plate blank material; tightly gluing the aluminum alloy plate blank material with the die cavity of a cavity die under the thrusting function of the viscoelastic-plastic materials to form the needed aluminum alloy covering part; opening the mould; taking out the formed aluminum alloy covering part; and removing the viscoelastic-plastic materials remained on the surface of the aluminum alloy covering part. The invention inhibits the rebound of the formed aluminum alloy covering part, prevents the local region from being cracked, improves the surface quality of the aluminum alloy covering part, and reduces the manufacture cost of the aluminum alloy covering part.

Description

technical field [0001] The invention relates to a pressure control method for soft mold forming of an aluminum alloy covering part, and belongs to the technical field of plate forming. Background technique [0002] Aluminum alloy sheet is one of the materials used in the automotive industry. In order to reduce the weight of the automobile body and improve the performance and safety performance of the automobile, aluminum alloy materials are gradually used for automobile body parts, especially for automobile body panels. The dimensional accuracy and wall thickness distribution of the parts have an important influence on its performance, so higher requirements are put forward for the forming technology. When the traditional rigid die forming method is used to manufacture the aluminum alloy cover, it is easy to produce serious local thinning and cracking, and the formed cover has a large springback; when using hot forming, it is necessary to heat and select an appropriate formi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/10B21D37/10
Inventor 王忠金李毅
Owner HARBIN INST OF TECH
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