(1) The elements with high content of C, O, Al, Si and some other alloy elements are found in the defect position of the inlet cylinder casting surface detected by Mt. The results show that the main defect is the primary oxide slag inclusion formed by the aggregation of...
The whole process from molten iron smelting to casting completion is a complex and irreversible process. In the process of high temperature smelting and pouring, it is impossible to ensure that the oxide slag is completely removed and does not enter the mold cavity. Theoretically, in order to effectively...
The main characteristics of the magnetic traces of linear defects detected by MT are mainly linear aggregated magnetic traces with large length width ratio. In ASME standard, the linear defects are defined as the display with the aspect ratio greater than 3. The defect indication position of the intake...
The main features of magnetic traces of point defects detected by MT. The magnetic traces are scattered and isolated small spots, stripes and cloud like discontinuous distribution. In the ASME standard, the size of the recorded defect is defined as the indication of more than 1.5mm. In normal production,...
The surface slag inclusion defect is the most common and the most difficult to avoid on the surface of gas turbine intake cylinder casting surface, mainly concentrated in the upper plane of pouring position, the upper surface of air port surface and the dead angle position of casting filling...
The floating of graphite and abnormal shape of graphite in the center is a kind of metallographic structure defect associated with shrinkage cavity and porosity tendency, which is very difficult to avoid in heavy section ductile iron casting. In order to avoid shrinkage cavity and porosity, the carbon equivalent...
By using ProCAST numerical simulation software to study the lost foam casting process of the representative steel and steel bearing in bridge bearing, the advantages and disadvantages of horizontal pouring and vertical pouring are compared and analyzed. The influence of pouring temperature, negative pressure degree and pattern density on...
The main functions of lost foam casting with negative pressure casting are as follows: (1) Compact the dry sand to prevent sand washing, mold collapse and mold wall movement (box expansion). (2) The results show that the speed and quantity of exhaust gas are accelerated, the filling ability of...
According to the position of molten metal introduced into the mold, the pouring methods can be divided into top pouring, bottom pouring, side pouring (including step pouring), or the comprehensive use of several pouring methods. The advantages and disadvantages of several pouring methods are as follows. 1.Top casting Advantages:...
The pouring position of a casting refers to the current state (posture) and position of the casting in the mold, that is, which part of the casting is up, down or side standing. The pouring position is usually divided into horizontal, vertical and inclined casting, namely the so-called horizontal...