Concept: Hydroforming of pipes into Hydroforming（internal high pressure forming） Hydroforming（internal high pressure forming） is made of stainless steel, copper, iron, aluminum, and other composite materials. The high pressure liquid and axial feed are applied inside the pipe to press the pipe into the mold cavity to form the material. The shape of the workpiece. A plastic processing technique (formation of adding a small amount of preservative in water) using an emulsified liquid as a force transmitting medium or a mold as a water-transmitting medium, also known as tube hydroforming (also known as hydraulic) Forming.

From the perspective of Hydroforming（internal high pressure forming） technology, the main advantages of Hydroforming（internal high pressure forming） and stamping welding process are: 1) Improve strength and stiffness, especially fatigue strength. 2) High material utilization. (up to 90%-95%) 3) Reduce production costs. (The cost is reduced by 15%-20% on average, and the mold cost is reduced by 20%-30%) 4) Reduce quality and save materials. (frames, beams can be reduced by 20%-40%, hollow shafts can be reduced by 40%-50%) 5) Reduce the weight of parts and molds and reduce the cost of molds. 6) It can reduce the amount of subsequent machining and assembly welding and improve production efficiency.

Today's development application areas: Pipe fitting hydroforming technology is now widely used in the automotive industry and the aerospace industry. Any new technology requires the application to drive and drive its development, and the automotive industry's demand for hydroformed products is the driving force behind the development of hydroforming technology. Pipe fitting hydroforming technology has several advantages over traditional stamping and welding processes: (1) Light weight. (2) High quality. (3) Low cost. (4) Design flexibility. 1. The structural parts are expanded from the standard pipe by hydroforming into a single integral component with more complicated structure, which saves materials. For hollow shaft parts, the quality can be reduced by 40% to 50%, effective section design and wall thickness design, effective section design and wall thickness design, saving materials up to 75%, and pipe hydraulic parts are reduced by an average of 15 compared to stamping parts. %~20%, mold cost is reduced by 20%-30%, and the cost of mold is reduced by 30%-50%. 2, the use of hydraulic forming technology can make the dimensional accuracy of the parts, the hydraulic forming products are better than the overall performance of the welded parts; the accuracy of the size is high, the processing error is reduced by 50%, from ±115mm to ±0175mm. 3. The pipe is hydroformed and the strength and rigidity are improved. The strength and rigidity of the molded part, especially the fatigue strength, are improved. 4. Many automobile frames adopt hydraulic forming technology, which has obvious superiority compared with traditional processing technology. The steps of the processing procedure are reduced from 32 steps to 3 steps, and the weight of molded parts is reduced from 12kg to 8kg.