With the development of economy, China’s automobile industry has developed rapidly, but it is facing the problems of unreasonable industrial structure, low technical level and weak independent R & D ability. One of them is the lack of rapid manufacturing capacity. Rapid prototyping technology, using the principle of material...
In recent years, with the vigorous development of manufacturing industry and the acceleration of the diversification of product market demand, the traditional sand casting for the trial production of new products can not meet the needs of enterprises and markets. With the rapid development of 3D printing technology and...
1. Simulation analysis of liquid metal filling process The filling state and temperature distribution at different stages of liquid metal filling process are shown in Figure 1. It can be seen that the single side bottom pouring system can realize the smooth filling of liquid metal. When t =...
The process of rapid sand casting technology to realize the rapid manufacturing of parts is as follows: establish the three-dimensional model of the casting; Complete the mold CAD model and casting process design; Using numerical simulation (based on ProCAST software) analyze and verify the mold design; make SLA pattern...
The structure of gearbox shell is shown in Figure 1. Its material is QT500-7, the blank weight is 458 kg, the casting wall thickness is 14.1 mm, and the maximum length is 949 mm. The casting is used for the transmission system of crawler tractor. The casting itself is...
1. Casting process In order to ensure the smooth filling of molten iron and prevent the occurrence of defects such as porosity and shrinkage porosity, a closed gating system is adopted. The cross-sectional area of each gating system is shift F, straight shift F, transverse shift F, in =...
1. Water glass sand mold pouring test Figure 1 shows the water glass sand mold pouring test of the brake arm of a tractor, with the casting size of 160 mm × 60 mm × 60 mm, material ZG45, single piece weight 0.85 kg. Using the traditional casting process,...
The internal and external lifting arms, the transmission rod of the separation manipulator and the brake housing of the tractor are small parts. There is a need for small batch manufacturing in the stage of product structure design, process adjustment and new product trial production. Small parts generally have...
SLS rapid investment casting generally needs three steps: SLS prototype firing, wax impregnation post-treatment and investment casting. Because there is a certain size error transfer between SLS prototype wax mold casting, in order to ensure that the final casting can meet the corresponding size accuracy requirements, the size error...
In view of the influence of different post-treatment on the surface quality of the specimen, considering the low surface strength of the wax pattern, in order to prevent the surface scratch of the specimen caused by the contact contact method, the optical non-contact measurement method is selected to measure...