Hydroforming technology of Shengminglong servo lower cylinder four-column hydraulic press
I. Advantages
Compared with the traditional stamping process, the hydraulic forming process has obvious technical and economic advantages in reducing weight, reducing the number of parts and molds, improving stiffness and strength, and reducing production costs, and has more and more applications in the industrial field, especially in the automotive industry.
In the automotive industry and other fields, reducing the quality of structure to save the ability of operation is a long-term goal, but also the development trend of advanced manufacturing technology. Hydroforming is an advanced manufacturing technology for lightweight structure.
Hydroforming is also known as "internal high pressure forming", its basic principle is to use the pipe as the billet, apply high pressure liquid inside the pipe at the same time, apply axial thrust to both ends of the tube billet, and fill the material. Under the joint action of two kinds of external forces, the tube blank material has plastic deformation and fits with the inner wall of the mold cavity, and there are hollow parts whose shape and accuracy meet the technical requirements.
Ii. Advantages
For hollow variable section structural parts, the traditional manufacturing process is to press two half pieces first, and then weld them into a whole, while hydraulic forming can be a whole to form the hollow structural parts that change along the section of the member. Compared with the stamping and welding process, the hydroforming technology and process has the following main advantages:
1. Reduce quality and save materials. For typical parts such as automobile engine brackets and radiator brackets, hydroforming parts are 20 to 40 percent lighter than stamping parts; For hollow step shaft parts, the weight can be reduced by 40 to 50 percent.
2. Reduce the number of parts and molds and reduce mold costs. Hydroforming parts usually only need 1 set of molds, while stamping parts mostly need multiple sets of molds. The number of hydraulically formed engine bracket parts was reduced from 6 to 1, and the number of radiator bracket parts was reduced from 17 to 10.
3. It can reduce the amount of welding for subsequent machining and assembly. Taking the radiator bracket as an example, the heat dissipation area was increased by 43 percent, the solder joints were reduced from 174 to 20, the processes were reduced from 13 to 6, and the productivity was increased by 66 percent.
4. Improve strength and stiffness, especially fatigue strength, such as the hydroformed radiator support, its stiffness in the vertical direction can be increased by 39 percent, the horizontal direction can be increased by 50 percent.
5. Reduce production costs. According to the statistical analysis of the applied hydroforming parts, the production cost of hydroforming parts is reduced by 15 to 20 percent compared with stamping parts, and the mold cost is reduced by 20 to 30 percent.
