1. Defect analysis (1) The slag cleaning treatment of molten iron is not complete; (2) The results show that the design of gating system is unreasonable, the slag blocking effect is not good, the molten iron entering the mold cavity is not stable, and the secondary oxidation forms oxide...
1. Defect analysis (1) There is a great difference in the wall thickness between the cylinder body and the shaft head, and the hot spot is prone to shrinkage defects; (2) Before the completion of liquid shrinkage, the feeding channel is closed in advance; (3) The amount of liquid...
In alloy 2, the nucleation and growth of primary carbides are in the high temperature liquid phase, and there is no other relative interference, so in a low stress field, there are fewer defects in the primary carbide crystal. On the contrary, eutectic carbides in alloy 1 and alloy...
1. Defect analysis (1) The stiffness of the base frame of the model is not enough, and the model is prone to warping deformation during modeling; (2) The rigidity of sand core is not enough, and the upper arch of the middle part is deformed during pouring, resulting in...
The basic structure of roller casting includes barrel and shaft head, which is in the shape of revolving body. The barrel is mostly of double wall structure, as shown in Figure 1. Material grade QT500-7, overall dimension φ 420 mm × 2 500 mm, wall thickness of cylinder body...
The casting is molded in a box of 2 pieces, with 550 kg spheroidizing treatment package, 10 boxes and 3 groups of U-shaped test blocks poured in a package, which is required to be finished within 10 minutes, generally within 8 minutes. However, from the above metallographic photos, it...
The structure diagram of QT600-3 gear casting produced by ZHY casting is shown in Figure 1, and the overall dimension is φ 302 mm × 66 mm, main wall thickness 56 mm, casting weight 16 kg. The casting is molded with furan resin sand and melted in 1.5 T...
The ferrite content in the matrix structure of ductile iron affects the carbon content of the matrix, thus affecting the formation of bainite during heat treatment. The ferrite content (volume fraction) determined according to GB / T 9941-2009 is shown in Figure 1. With the increase of Nb content,...
1. Pouring position and parting surface According to the practical production experience for many years and the principle of accurate and reliable positioning of sand core, in order to ensure the accurate positioning of clay core, improve the dimensional accuracy, and facilitate the inspection of box size and wall...
The structure of cylinder block casting is complex, and there are many internal cavities. For this kind of structure casting, the traditional casting process needs to consider the following points: (1) The water cavity of the cylinder block is a relatively independent structure, and the sand core of the...