For different casting defects (such as sand sticking, porosity, sintering, veining, shrinkage porosity at hot spot, etc.), the foundry should […]
The gray cast iron cylinder body adopts the traditional horizontal pouring process, the sand core is dipped with coating respectively
1. Defect analysis of original process plan In the original process, two blind risers are set at positions a and
1. Product structure and technical requirements The diameter of valve body is ϕ 254 mm, the maximum outline size of
1.Runner 2. Runner cup 3. Riser 4, 5, 6. Ingate 7. Lap sheet 8. Sprue 9. Annular runner The original
1.Current process Due to the serious slag inclusion problem, the white mold material is replaced by stmma, the specific gravity
1、 Improvement measures for defects such as sand hole and air hole are as follows. 1) Properly increase sand mold
Through the analysis of the failure parts by using the main factor diagram method, the causes of the fracture of
Riser is a kind of structure for storing liquid metal in the mold, which is used to compensate the possible
Through the observation of the defects, it is found that the defects are shrinkage porosity and shrinkage cavity, which are
1. Static structural analysis Finite element static structural analysis is carried out for the box type and deep cavity type
After the sample navigation is completed, the detection can be started, as shown in Figure 1. Move the sample table
As shown in Figure 1, a low-pressure casting water-cooled housing for electric bus is in the shape of a drum
The original material of zc170 cylinder head is HT300, the technical requirements are WCu = 0.5% ~ 0.8%, WCR =
1. Primary raw materials Q12 pig iron, industrial scrap, vermicularizing agent (wre = 9% – 11%, WMG = 4% –
It is very important to select the appropriate carbon equivalent or carbon silicon content for the production of sound castings
1. Carbon, silicon and carbon equivalent When the carbon equivalent is at the eutectic point, the casting process performance is
1. Defect analysis (1) The inner cavity of the cylinder body is a long strip-shaped sand core, and the gas
1. Defect analysis (1) The slag cleaning treatment of molten iron is not complete; (2) The results show that the
1. Defect analysis (1) There is a great difference in the wall thickness between the cylinder body and the shaft
In alloy 2, the nucleation and growth of primary carbides are in the high temperature liquid phase, and there is
1. Defect analysis (1) The stiffness of the base frame of the model is not enough, and the model is
The basic structure of roller casting includes barrel and shaft head, which is in the shape of revolving body. The
The casting is molded in a box of 2 pieces, with 550 kg spheroidizing treatment package, 10 boxes and 3
The structure diagram of QT600-3 gear casting produced by ZHY casting is shown in Figure 1, and the overall dimension
The ferrite content in the matrix structure of ductile iron affects the carbon content of the matrix, thus affecting the
1. Pouring position and parting surface According to the practical production experience for many years and the principle of accurate
The structure of cylinder block casting is complex, and there are many internal cavities. For this kind of structure casting,
Three kinds of annealing process were selected, and the annealing time was 18 h, 11 h and 8 h, respectively.
The structure of 11 l engine cylinder head casting is shown in Figure 1, and the overall dimension of the
