High Pressure Forming Process In Support Pressure

Internal high pressure forming is also called hydroforming or hydraulic forming. It is a material forming process that uses liquid as a forming medium and controls internal pressure and material flow to achieve the purpose of forming hollow parts. The internal high pressure forming process is divided into conventional internal high pressure forming and supporting pressure internal high pressure forming.
Features of conventional internal high pressure forming:

• The inside of the tube is not pressurized before the mold is closed;
• Pressurize inside the tube after the mold is closed;
• The forming process is after the mold is closed. In most cases, the end material is fed while increasing the pressure;
• There is always an obvious process of expansion during the process;
• The maximum pressure is 100～300MPa.

High pressure forming under support pressure

• Always maintain pressure in the tube before the mold is closed;
• The formation of parts is almost realized under the condition of internal supporting pressure;
• The maximum pressure is to smooth the surface of the part after the mold is closed, and support the punching operation;
• There is basically no swelling part (unless it is possible to extend both ends when necessary, even if the pressure is low);
• The maximum pressure is 50～100MPa.

The high-pressure forming process in the supporting pressure is: first inject the medium inside the part and increase its pressure, and then close the mold, so that during the forming process, wrinkles caused by low expansion can be avoided, and the material in the mold closing process can be optimized distributed. At the same time there are other positive effects. Since there is no significant expansion, there is no work hardening process, and this process can use a lower maximum pressure than conventional internal high pressure forming.

Compared with conventional internal high pressure forming, the advantages and disadvantages of supporting pressure internal high pressure forming are as follows:

1. Advantages

For materials with low formability, it can be formed safely; it can achieve a more consistent wall thickness; there is no risk of part breakage; a small angle radius can be achieved; more and larger holes can be achieved; under normal circumstances, there is no need for lubrication; Combination pressure forming + final forming can be realized; the die load is small, so the volume of the die can be reduced; the tonnage of the press can be smaller; the cycle time may be reduced; the demand for press oil is reduced; the wear of high-pressure parts is reduced; Internal high pressure forming is more economical.

2. Disadvantages

Formed parts have larger tolerances, and the springback problem is serious. The processed parts must have a constant circumference, low work hardening, and are susceptible to the influence of the upstream process and the fluctuation of the tolerance of the fillet radius.

Taking into account the impact of these shortcomings on the quality of parts, it is necessary to determine the appropriate process according to the characteristics of the parts.

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By Minghe Die Casting Manufacturer |Categories: Helpful Articles |Material Tags: Aluminum Casting, Zinc Casting, Magnesium Casting, Titanium Casting, Stainless Steel Casting, Brass Casting,Bronze Casting,Casting Video,Company History,Aluminum Die Casting |Comments Off