1. Internal high pressure forming technology
Internal high pressure forming technology is a new forming technology that has only appeared in recent years, and is currently a research frontier in the world. According to their structural characteristics, various connectors can be formed at one time by internal high-pressure forming method, or they can be made into profiles by general extrusion method, and then corrected by internal high-pressure forming method, through internal pressure and axial force feeding Press the tube blank into the mold cavity to form it.
Due to the excellent internal high-pressure forming performance and large design freedom, one internal high-pressure formed part can replace the workpiece formed by welding several parts, so it avoids the distortion and deformation caused by welding, and has high dimensional accuracy and mechanical properties. Its main advantages are: reducing quality and saving materials.
2. Precision die-casting technology
The joints of the aluminum alloy body frame structure are mostly formed by casting, and the casting methods used are mainly advanced high-precision die-casting methods such as semi-solid die-casting. Semi-solid die-casting technology currently has two forming processes: flow forming process and thixoforming process. The former is to send liquid metal into a specially designed injection molding machine barrel, which is sheared by a screw device to cool it into a semi-solid slurry, and then die cast. The latter is to send solid metal particles or debris into a screw injection molding machine, and then convert the metal particles into a slurry under heating and shearing conditions and then die-casting.
At present, the semi-solid metal casting used in industrial applications at home and abroad mainly refers to thixotropic casting, which is widely used in the body frame structure. As a precision forming method, thixocasting has high strength of the workpiece after forming, and can realize one-time forming of complex shapes. It can be used to achieve mass production of various non-cutting or rarely cut parts, reducing the number of parts.