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Plate viscous medium pressure forming rebound self-adaptive control method

An adaptive control and viscous medium technology, applied in the field of plate forming, can solve the problems of long springback time, high cost, and limited improvement in dimensional accuracy, and achieve the effect of eliminating mold repair

Active Publication Date: 2019-10-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current springback control methods, on the one hand, control the springback to a certain extent by optimizing various process parameters such as blank holder force, lubrication conditions, and slab shape, and on the other hand, control the springback by optimizing the mold surface. Compensation, but at present these methods take a long time to control the springback effect, the cost is high, and the dimensional accuracy is limited. It is impossible to control the springback from the root cause. It is necessary to explore the pressure control of the forming process to suppress the springback during the forming process. Methods

Method used

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  • Plate viscous medium pressure forming rebound self-adaptive control method
  • Plate viscous medium pressure forming rebound self-adaptive control method
  • Plate viscous medium pressure forming rebound self-adaptive control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment one: select regular spherical concave mold 1 for use,

[0047] 1. The material of the blank 2 is stainless steel 304, 1.02×10 -3 hour,

[0048] The size of P is 130MPa; and in the selection of viscous medium 4, the strain rate sensitivity index m is 0.1, ΔP is 25-27MPa, V 1 =0.8mm / s, V 2 Under the condition of =0.1mm / s, the duration t only needs to be 5s, and the plate blank 2 can be formed without springback;

[0049] 2. The material of the blank 2 is aluminum alloy AL1060, 1.81×10 -3 hour,

[0050] The size of P is 70MPa; and in the selection of viscous medium 4, the strain rate sensitivity index m value is 0.5, ΔP is 13-18MPa, V 1 =0.3mm / s, V 2 Under the condition of =0.01mm / s, the duration t only needs to be 7s, and the plate blank 2 can be formed without springback;

[0051] 3. The material of slab blank 2 is superalloy GH4169, 2.75×10 -3 hour,

[0052] The size of P is 150MPa; and in the selection of viscous medium...

Embodiment 2

[0053] Embodiment two: select the die 1 of ladder shape for use, and the material of plate blank 2 is aluminum alloy AL1060, 1.81×10 -3 , the size of P is 80MPa; and when viscous medium 4 is selected, the strain rate sensitivity index m is 0.5, ΔP is 11MPa, V 1 =0.2mm / s, V 2 Under the condition of =0.06mm / s, the duration t only needs to be 8s, and the blank 2 can be formed without springback;

Embodiment 3

[0054] Embodiment three: select the concave mold 1 of variable-diameter component shape for use, and the material of plate blank 2 is superalloy GH4169, 2.75×10 -3 , the size of P is 170MPa; and in the selection of viscous medium 4, the strain rate sensitivity index m is 0.9, ΔP is 5MPa, V 1 =0.1mm / s, V 2 =0.005mm / s, the duration t only needs to be 8s, and the blank 2 can be formed without springback.

[0055] In summary, the present invention utilizes the strain rate sensitivity of the viscous medium 4, and its pressure can adapt to the shape change of the plate. During the pressure forming of the viscous medium 4, by controlling the unloading mode of the viscous medium 4 during the unloading process, the formed part is During the unloading process, the mold is repeatedly attached and the residual stress is gradually released to reduce the internal stress gradient of the formed part when it is finally attached to the mold. Not only can the springback be controlled,...

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Abstract

The invention relates to a plate viscous medium pressure forming rebound self-adaptive control method. The plate viscous medium pressure forming rebound self-adaptive control method comprises the following steps that I, fixing a medium bin, installing a plunger in the medium bin, and injecting a viscous medium into the medium bin; II, placing a plate blank at the top of the medium bin, then installing a female die on the plate blank and is fixing the female die, so that clamping the plate blank between the medium bin and the female die; III, pushing the plunger in the medium bin to move upwards at the speed V1, gradually attaching the plate blank to a cavity of the female die, and being the pressure P in the medium bin; IV, enabling the plunger to move downwards at the speed V2, so that reducing the pressure in the medium bin to be P1, meanwhile, stopping moving the plunger downwards, so that keeping constant the pressure P1 in the medium bin, and being the duration time t; and V, after lasting the pressure p1 for the duration t, moving the plunger downwards again at the speed V2 until completely unloading the viscous medium. The plate viscous medium pressure forming rebound self-adaptive control method has the advantages that a forming part can be repeatedly stuck the die in the unloading process and the residual stress is gradually released, so that the resilience is controlled.

Description

technical field [0001] The invention relates to the technical field of sheet material forming, in particular to an adaptive control method for sheet material viscous medium pressure forming springback. Background technique [0002] Sheet metal stamping forming will produce springback after unloading. The essence of springback is the uneven distribution of internal stress after sheet forming. During the unloading process, the stress field caused by the release of residual stress inside the formed part re-establishes a balance process. Therefore, the springback The size depends on the internal stress state of the formed part before springback and the geometry of the formed part. At present, springback is a widespread phenomenon in sheet metal plastic forming, which seriously affects the size and shape accuracy of stamping parts, and is an urgent problem to be solved in industry and academia. The current springback control methods, on the one hand, control the springback to a ...

Claims

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Application Information

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IPC IPC(8): B21D26/027
CPCB21D26/027
Inventor 王忠金冯业坤杨继平
Owner HARBIN INST OF TECH
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