1. Defect analysis (1) The inner cavity of the cylinder body is a long strip-shaped sand core, and the gas generation speed of the sand core is fast. If it can not be discharged in time, it is easy to produce choking fire, resulting in porosity defects in the...
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...
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 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...
1) The strength and elongation properties of y-block hot metal casting were compared. It can be seen that with the increase of silicon content, the strength of the casting increases and the elongation decreases, and the solid solution strengthening effect of silicon is similar to that of Y block....
1. Defect analysis (1) The rib plate of the cylinder body forms a grid shaped geometric hot spot with the cylinder body; (2) The layout of the ingate is unreasonable, resulting in flow hot spot; (3) It is easy to form shrinkage porosity and porosity when the geometric and...
In the process of measurement, if the temperature of the reference end changes, even the temperature range is large, the measurement accuracy of the thermocouple will be seriously distorted. In order to stabilize the reference end and eliminate the distortion caused by the reference end, it is necessary to...
The upper limit of temperature measurement is as high as 1350 ° C. in the process of temperature measurement, the thermocouple should not only bear high temperature, but also accept the corrosion and impact of high temperature molten iron. In order to maintain the accuracy of temperature measurement, it...
The principle of thermocouple temperature measurement is thermoelectric effect. In the thermocouple loop, the high temperature end is called the measuring end (or working end), and the low temperature end is called the cold end (or reference end). The reference end is usually at a constant temperature. According to...