The room temperature tensile strength and elongation of A1 and A2 alloys under different processes are shown in Fig. 1. It can be seen from Fig. 1 that for the alloy with the same composition, under the same extrusion pressure, the tensile strength and elongation of the ultrasonic rheological...
This kind of die-casting is a process between metal mold casting and die-casting. Under the action of pressure, the aluminum melt fills the cavity from one or two gates at the bottom along the riser, solidifies from the place far away from the gate, and gradually expands to the...
Pressure casting is called die casting for short. Under a certain pressure, the melt can fill the cavity. The structure of the casting is compact, the mechanical property is high, the dimension is precise, and the machining allowance is small. According to the pressure level, it can be roughly...
The control system of vacuum differential pressure casting is one of the key factors to ensure the quality of castings, especially thin-walled castings. The early control system is mostly manual control, the control operation is not stable, and the casting quality is difficult to guarantee. In the past 20...
In order to meet the requirements of lightweight and integration of components, a large number of large-scale complex thin-walled aluminum alloy castings are widely used in the field of aerospace. This kind of products have higher and higher requirements for castings, which put forward the requirements of large size,...
1. Low pressure casting process With the development of science and technology, the disadvantages of using gravity casting to produce aluminum alloy wheel hub are also highlighted. The cost of gravity casting is low, but the product quality is not high, and there are many defects such as shrinkage...
According to the principle of low pressure casting, the key of the process is the filling process. The solution of the turbulence problem of the liquid metal in the rising phase and the effective control of the fluid velocity in the filling phase are the key to ensure the...
One of the main purposes of low-pressure casting technology is to solve the contradiction between filling and feeding of the traditional gravity casting pouring system. Because the liquid metal fills the mold from the bottom to the top, the initial application of this technology is limited to light alloys...
The basic principle of low pressure casting is: under the action of pressure, the liquid metal at a certain temperature slowly enters and fills the mold cavity and riser along the riser from bottom to top through the sprue, then pressurizes and holds the pressure until the casting is...
For the same alloy, whether the hub cracks or not often depends on the hub structure, process parameters and mold temperature and other factors. The influence of improper design of hub structure on hub crack 1) The improper size of the inner fillet is the most common reason for...