The lower body integrated die-casting machine with a locking force of 13000T, relying on "double injection technology", can create a complete car chassis in just two minutes. This equipment was born in Ningbo Lijin Intelligent Equipment Co., Ltd., a company in the Qianwan New Area.
In recent years, with the continuous progress of integrated die-casting technology and the expansion of application fields, more and more automobile manufacturing and supply chain enterprises have joined this innovative field. At first, the workers needed to weld and assemble 158 parts in order to assemble a complete car body; later on, the process was improved by die-casting the front engine compartment, motor tray (battery box), and rear bottom plate separately, and then assembling them into a whole, but it was still not efficient enough.
The traditional single injection die casting is to inject aluminum liquid into the mold cavity through a single injection system, but just like the spraying distance of a faucet is limited, the distance of aluminum liquid flow under single injection conditions also has its limit.
With the continuous growth of demand for ultra large integrated die-casting products, the increasing volume of die-casting parts, and the continuous improvement of die-casting tonnage, traditional single injection systems are gradually unable to meet the increasingly complex and demanding manufacturing needs. Especially driven by advanced design concepts such as integrated die-casting of vehicle chassis and skateboard chassis, the injection molding process has faced unprecedented technical challenges.
"When the size of the product to be manufactured is large enough, a single injection die casting machine is unable to handle it," said Li Jianjun, the manager of the application engineering department of Lijin Technology. A single injection system cannot fill the product with aluminum liquid, so two "faucets" are needed to inject the aluminum liquid into the mold to shape it. The biggest challenge is to control the convergence point of the two injected aluminum liquids within a very small deviation.
In order to overcome this challenge, technicians conducted thousands of simulation experiments and finally successfully controlled the time deviation of two streams of aluminum liquid flowing through the convergence point of the equipment within 4 milliseconds, which is approximately the time it takes for a bee to flap its wings once. In March 2024, the 13000T die-casting machine was successfully born in the base in the Qianwan New Area, and immediately gained the favor of well-known new energy vehicle companies.
From continuously upgrading the locking force to breaking through the industry barriers of single injection to double injection, the pace of technological iteration of Lijin Intelligent Equipment has never stopped. Lijin Intelligent Equipment's die-casting technology test center is equipped with die-casting machines ranging from 3000T to 5000T, as well as 9000T intelligent die-casting machines and 13000T double injection die-casting machines. In addition, the center is equipped with a 700T extrusion casting machine, low-pressure casting machine, and a series of peripheral automation equipment, which can provide customers with comprehensive aluminum alloy product testing, trial molding, and small batch trial production services.
