Half-mould forming process for metal plate material

Abstract

A half-mould shaping technology for metallic plate features that the solid particles are used to replace the rigid male mould. It includes such steps as providing high-hardness steel balls with diameter less than 4 mm or natural sand as force transfer medium, making a female mould, loading a metallic plate in it, adding said force transfer medium on the plate, and using a pressing head to press them for the plastic deformation of metallic plate.

Description

technical field [0001] The invention relates to the technical field of thin plate forming, in particular to a half-mould forming process of metal sheet material. Background technique [0002] The traditional rigid punch-and-concave die drawing process requires multiple times of deep drawing to form deep drawn parts with a large drawing ratio, and the forming quality is poor. For the deep drawing of low plasticity and large deformation parts, it can't even be formed. To this end, people have proposed a half mold forming process (also known as sheet metal soft mold forming). [0003] The half-mold forming of the sheet metal is to use a certain force transmission medium as the punch (or die), and then use a rigid die (or punch) to make the sheet according to the shape of the rigid mold under the pressure of the pressure transmission medium. Forming process. [0004] In the half-mold forming process of sheet metal, the cold half-mold forming includes liquid forming with water...

AI Technical Summary

Problems solved by technology

However, evenly distributed pressure is not conducive to the control of the thickness of the formed part. Once the material is partially thinned during the forming process, it will easily cause cracks in the thinned area

In addition, due to the difficulty of sealing control in the hydroforming process, sealing rings must be used to force sealing, so that the material flow is restricted, resulting in deformation of the sheet metal by thinning, which greatly restricts the use of the sheet metal forming limit

In this case, in order to form a qualified product, it is often necessary to increase the thickness of the plate and increase the weight of the material.

In addition, due to the difficulty of sealing, leakage is easy to occur and the leakage control is difficult, which often leads to forming failure

When the forming fails, the oil splashes, pollutes the environment, and endangers the operators

Therefore, the application of hydroforming is limited

[0006] The main technological feature of half-mold forming with viscous material as the force transmission medium is that the viscous medium not only overcomes the characteristics of rubber that can not easily realize pressure control and is difficult to form parts accurately, but also makes up for the pollution caused by liquid filling forming and the difficulty of maintaining long-term Time well-sealed flaws

However, there are also disadvantages such as the viscous medium still needs a better sealing environment, a more complicated control system, viscous medium and high cost of the mold system.

Images