Internal high-pressure forming has the characteristics of light parts, good product quality, flexible product design, simple process, near-net forming and green manufacturing, so it has been widely used in the field of automobile lightweight. Through effective cross-section design and wall thickness design, many automobile parts can be made into single integral parts with complex structure by internal high pressure forming with standard pipes. This is obviously superior to the traditional stamping welding method in terms of product quality and simplicity of production technology. Most hydroforming processes only need a punch (or hydroforming punch) with the same shape as the part, and the rubber diaphragm on the hydroforming machine plays the role of a common female die, so the die cost is saved by about 50% compared with the traditional die. Compared with traditional multi-step stamping, hydroforming can form the same parts in only one step.

Compared with stamping welded parts, hydroforming of pipe fittings has the advantages of saving materials and reducing weight. The weight of general structural parts can be reduced by 20% ~ 30%, and the weight of shaft parts can be reduced by 30% ~ 50%. For example, the weight of general stamping parts is 12kg, the weight of internal high-pressure forming parts is 7 ~ 9 kg, and the weight of radiator support is 34%. The subsequent proces amount and welding workload can be reduce; Improve the strength and rigidity of parts, and improve the fatigue strength due to the reduction of solder joints. Compared with stamping parts, the material utilization rate is 95% ~ 98%; Reduce the production cost and mold cost by 30%.