Double-sided pressure-controlled hydrodynamic deep drawing forming method for sheet based on dynamic and static combined liquid pool

A liquid-filled deep drawing and combined liquid technology, which is applied in the field of double-sided pressure-controlled liquid-filled deep drawing of sheet metal based on a dynamic and static combined liquid pool, can solve the problems of wrinkling and the limited effect of preventing wrinkling, and reduce wrinkling. , Improve surface quality, easy operation effect

CN111589931AActive 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 double-sided pressure-controlled hydrodynamic deep drawing forming method for a sheet based on a dynamic and static combined liquid pool, and belongs to the technical field of hydraulic forming of sheet metal. The method comprises the following steps that firstly, liquid is filled into a static liquid pool and a certain pressure is kept, after a dynamic liquid pool is jacked up to a set position, the liquid is filled into the dynamic liquid pool, and the sheet is put above the dynamic and static combined liquid pool; sheet pre-expansion and liquid pressure control inthe dynamic liquid pool are realized through startup of a hydraulic system of the dynamic liquid pool; a closed space formed by a material pressing plate, a punch and the sheet communicates with the hydraulic system, and the liquid pressure acts on the upper surface of the sheet to realize pressure loading and process control of the upper surface of the sheet; after the punch moves downwards to bein contact with the bottom of the dynamic liquid pool, the punch and the dynamic liquid pool move downwards together, the sealing between the dynamic liquid pool and the static liquid pool is ineffective, the liquid between the dynamic liquid pool and the static liquid pool communicates through a gap between the dynamic liquid pool and the static liquid pool, and the liquid pressure acts on the sheet; and the punch continues moving downwards, and the pressure of the liquid in the static liquid tank and the pressure of the upper surface of the sheet are changed according to a set pressure andpunch stroke curve until the forming is finished.
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Description

Technical field:

[0001] The invention belongs to the technical field of hydroforming of metal sheets, and in particular relates to a double-sided pressure-controlled liquid-filled deep-drawing method for sheets based on a combined dynamic and static liquid pool.

[0002] technical background:

[0003] Sheet metal liquid-filled deep drawing is an advanced sheet metal forming method developed in the past two decades. Its high-quality formed parts and low mold cost have attracted more and more attention from researchers and manufacturers. The improvement of the formability of the sheet metal during the liquid-filled deep drawing process is mainly due to the "overflow lubrication effect" produced by the high-pressure liquid overflow during the liquid-filled deep drawing forming process, and the "friction retention effect" produced by the pressure of the liquid pool; deep drawing During the process, due to the hydraulic anti-expansion effect of the sheet metal in the suspended are...

Examples

Embodiment Construction

[0020] The specific steps of the double-sided pressure-controlled liquid-filled deep drawing method for sheet metal based on the dynamic and static combined liquid pool provided by the present invention are as follows:

[0021] (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.

[0022] (2) Liquid is filled in the dynamic fluid pool; the liquid can be filled through a hydraulic system connected with the cavity of the dynamic fluid pool, or by other means.

[0023] (3) The sheet is placed on the dynamic and static combined liquid pool.

[0024] (4) The binder plate goes down, and the plate is clamped by the static combined liquid pool and the binder plate.

[0025] (5) The hydraulic system of the dynamic fluid pool is started to realize the pre-expansion of the sheet metal and the pressure control of the liquid in the dynamic fluid pool.

[0026] (6) The closed space c...