A large number of researches and applications have been carried out on the squeeze casting forming technology in foreign countries. For example, the United States has started the joint research and development of automobile light alloy front knuckle since 1994. In recent years, large parts such as V6 engine block, engine bracket and tank load wheel have been produced. In terms of equipment, manufacturers in Japan, Switzerland and other countries have produced large-scale extrusion casting special equipment with a locking force of 3550 tons. In view of the confidentiality measures taken by all relevant technical parties, there are few references in foreign literature except for product samples and advertisements.
The research on squeeze casting in China is limited by the research conditions, which mainly focus on the forming of small and medium-sized parts. The research on squeeze casting in China is limited by the research conditions, which mainly focus on the forming of small and medium-sized parts, such as the indirect squeeze casting die for automobile fork parts designed by Bray, etc., which designs the indirect squeeze casting die for automobile fork parts; the indirect squeeze casting die for motorcycle clamp parts designed by Luo Ji et al The squeezewas simulated, and the optimized process parameters were obtained. Zhao Hongjin et al. Studied the direct squeeze casting of the magnesium alloy shaft and barrel. The squeeze casting process was studied. Zhang Zhan et al. Studied the squeeze casting process of the magnesium alloy wheel hub, and got the best process parameters by the experimental method Chen JUANJUAN et al. Studied the double squeeze casting technology of aluminum alloy connecting rod, analyzed the die structure and process flow, and analyzed the die structure and process flow.
It should be pointed out that in recent years, qipixiang et al. Put forward the double extrusion casting method, which is also called continuous casting and forging or casting forging double control forming by some scholars. Its working principle is that the filling head will send the molten metal in the filling device into the mold cavity composed of the upper and middle mold which have been pre closed and locked, and the upper mold which has a certain amount of pressure reduction reserved and continue to maintain pressure, and then the upper mold will go down again Extrusion equipment. The double squeeze casting method requires high equipment, so it is necessary to use the computer-controlled three-step as the second squeeze. The second extrusion is formed by two extrusion casting, the first is indirect extrusion casting, the second is direct extrusion casting.
At present, there are relatively few researches on extrusion casting method and technology of complex large parts in China, and indirect extrusion casting is mainly used. For example, Li Yuanyuan used Al Cu Mn material to do indirect extrusion casting for large wheel hub. For example, Li Yuanyuan used Al Cu Mn material to do indirect extrusion casting for large wheel hub, casting T5 The results of mechanical properties test after as heat treatment show that the average tensile strength and elongation of the castings are 390mpa and 390mpa respectively 10%; Li Yuanyuan et al. Also studied the indirect squeeze casting with electromagnetic pump assisted filling for large aluminum alloy bracket, which proved the feasibility of the indirect squeeze casting forming process with electromagnetic filling; Hou Liqun et al. Used the existing cast aluminum alloy and deformed aluminum alloy materials, carried out the squeeze casting forming research on aluminum alloy and deformed aluminum alloy materials for the load wheel of light-duty combat vehicle The influence of direct punch extrusion, indirect extrusion and double extrusion on the mechanical properties of the formed parts was studied. The maximum dimension of the formed wheel is 580mm, and its weight is about 30kg. The results show that the tensile strength and elongation of the formed wheel are 227-375mpa and 5-12% respectively under 50MPa extrusion pressure. At present, the main reason that hinders the application of large-scale part squeeze casting technology at home and abroad is that there is still a lack of methods and equipment to adapt to large-scale part squeeze casting, which restricts the development of related technology and technology.