Coordinated control method of liquid chamber pressure and variable blank-holder force during liquid-filled deep drawing

Abstract

The invention relates to the technical field of stamping and forming, in particular to the technical field of liquid-filled deep drawing, and provides a method for coordinated control of liquid chamber pressure and variable blank-holder force in the process of liquid-filled deep drawing. In the aerospace field, liquid-filled deep drawing technology is often used to form high-end equipment parts; in addition, new materials that are difficult to deform, such as magnesium alloys and aluminum alloys, also need to be formed by liquid-filled deep drawing. According to the three-dimensional model of the stamping die and sheet metal, the method adopts the method of finite element analysis, and through the numerical simulation simulation analysis, the variable blankholder force loading curve under the condition of good forming quality and no liquid chamber pressure is determined, and the constant blankholder force loading curve is determined. The pressure loading curve of the liquid chamber under the action of the edge force, the pressure loading curve of the liquid chamber is converted into the additional blank holder force curve of the flange area when the liquid overflows in the liquid chamber, and is superimposed with the variable pressure loading curve to obtain Variable blankholder force under pressure loading optimizes the loading curve, thereby improving the forming quality of the part.

Description

technical field [0001] The invention relates to a coordinated control method of liquid chamber pressure and variable blank-holding force in the process of liquid-filled deep drawing, which belongs to the technical field of punching and forming, especially the technical field of liquid-filled deep drawing. Background technique [0002] In the field of aerospace, parts of some high-end equipment are often formed by liquid-filled deep drawing technology; in addition, many new materials that are difficult to deform, such as magnesium alloys, aluminum alloys, etc., also need to be formed by liquid-filled deep drawing. Liquid-filled deep drawing of sheet metal is a soft mold technology that combines stamping forming and hydraulic technology. The pressure of the liquid chamber is used to replace the die or punch in the traditional stamping forming mold. The forming quality of the parts is high and the dimensional accuracy is high. it is good. The loading curve of the liquid chambe...

AI Technical Summary

Problems solved by technology

When the sheet is formed under the combined action of the blank holder force and the pressure of the liquid chamber, when the pressure of the liquid chamber is too high, the blank holder force cannot resist the tangential compressive stress, so that the stamping parts cannot be fully drawn

How to set a reasonable loading curve of variable blank holder force under the condition of variable liquid chamber pressure, so that the liquid chamber pressure and blank holder force can coordinate and control the forming of the sheet is a difficult problem. During forming, the trial and error method is generally used to debug the variable blank holder force. The cost of time, manpower and material resources is high, and there are certain difficulties.

Images