Sheet metal hydrodynamic deep drawing forming method based on dynamic and static combined liquid pools

A liquid-filled deep-drawing and combined-liquid technology, which is applied in the field of sheet metal liquid-filled deep drawing based on dynamic and static combined liquid pools, can solve the problems of limited wrinkling prevention effect and insignificant improvement of forming ability, etc. The effect of wrinkling, easy handling, and improved forming ability

CN111589932AActive Publication Date: 2020-08-28ANHUI UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-08-28

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Abstract

The invention discloses a sheet metal hydrodynamic deep drawing forming method based on dynamic and static combined liquid pools, and belongs to the technical field of sheet metal hydroforming. The forming method comprises the following specific steps that the dynamic and static liquid pools are not connected to each other at the beginning, the static liquid pool is filled with liquid and maintained at a certain pressure, and the dynamic liquid pool is lifted to a set position; the dynamic liquid pool is filled with liquid; the sheet metal is placed on top of the dynamic and static combined liquid pools; a pressing plate goes down, the sheet metal is clamped by the dynamic and static combined liquid pools and the pressing plate; a hydraulic system of the dynamic liquid pool starts to realize the pre-expansion of the sheet metal and the pressure control of the liquid in the dynamic liquid pool; a punch starts to go down, and the pressure changes with the stroke of the punch according tothe preset value; the punch goes down to the sheet metal and goes down together with the dynamic liquid pool after being in contact with the bottom of the dynamic liquid pool, the seal between the dynamic and static liquid pools loses its effect, the liquid in the dynamic and static liquid pools is communicated through gaps between the dynamic and static liquid pools, and the liquid pressure actson the sheet metal; the punch continues to go down, and the liquid in the static liquid pool changes according to the set pressure and the stroke curve of the punch until the end of forming.
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Description

Technical field:

[0001] The invention belongs to the technical field of sheet metal hydroforming, and in particular relates to a liquid-filled deep-drawing method for sheet metal based on a combined dynamic and static liquid pool. Background technique:

[0002] Sheet metal liquid-filled deep drawing is an advanced sheet metal forming method, which has received more and more attention. It has the advantages of good surface quality, high dimensional accuracy and low mold cost. Due to the hydraulic anti-expansion effect of the sheet metal in the liquid-filled deep drawing process, the stress state of the suspended area can be changed, which can prevent the wrinkling of the suspended area to a certain extent, and can improve the forming of complex parts. However, for the parts with large suspended parts in the drawing process, by changing the stress state, the effect of preventing wrinkling is limited, and the effect of improving the forming ability of complex parts with large ...

Examples

Embodiment Construction

[0016] The specific steps of the sheet metal liquid-filled deep drawing method based on the dynamic and static combined liquid pool provided by the present invention are as follows:

[0017] (1) Fill the static liquid pool (outer die) with liquid and maintain a certain pressure, and the dynamic liquid pool (inner die) is pushed to the set position.

[0018] (2) Fill the fluid pool with liquid.

[0019] (3) The sheet is placed on the dynamic and static combination liquid pool; the binder plate goes down, and the sheet is clamped by the passive and static combination liquid pool and the binder plate.

[0020] (4) The punch starts to go down, the liquid in the fluid pool is squeezed, the pressure rises and the sheet material begins to deform under the pressure of the forming medium; the punch continues to go down, and the liquid pressure is controlled by the pressure control system of the fluid pool.

[0021] (5) The punch goes down to the bottom of the sheet and contacts the bo...