1) The riser and flesh gain of splay saddle head are relatively large. The riser must be cut hot according to the process temperature and kept warm and cooled slowly to prevent cracks. 2) The extra meat in the saddle groove must be cut at 200 ℃~250 ℃ after...
The upper surface of the steel casting is easy to produce defects such as sand holes, air holes and slag inclusions, so the processing amount of the upper surface is generally larger. According to the process specification, the processing allowance of the steel casting is determined to be 40...
The number of risers shall be determined according to the grade of steel casting quality requirements and the structure of parts. Generally, thick walled steel castings adopt centralized feeding, and thin walled steel castings adopt decentralized feeding principle to design risers. The shape and size of the riser shall...
1. Chemical composition and mechanical properties of product materials C Si Mn P S 0.17~0.25 ≤0.60 0.8-1.2 ≤0.025 ≤0.025 Main elements Ni Cr Cu Mo V Total 0.40 0.35 0.40 0.15 0.05 1 Residual elements (≤) The material used for the splay saddle head steel casting is ZG270-480H. The...
According to the principle of conventional parting surface selection: the parting surface shall be as simple as possible, and the flat parting surface shall be taken to avoid sand hanging tire (except for special circumstances). The parting surface shall be the largest horizontal plane of the casting as far...
The molten steel of steel castings has high melting point, poor fluidity, large shrinkage and easy oxidation. Therefore, the gating system is required to be simple in structure, large in sectional area, fast and stable in filling, and have an appropriate rate of liquid level rise. An open gating...
In the past, similar steel castings used the core assembly molding, and the size of the sand core is relatively large. If the core assembly molding is also used, the core box will be slightly deformed, which will greatly affect the shape of the overall steel casting. Real sample...
The steel casting of splay saddle saddle head is the first suspension bridge for both highway and railway in China, and also the key component of the world’s first high-speed railway suspension bridge Wufengshan Yangtze River Bridge. The splay saddle is composed of saddle groove, saddle body and base,...
The castings without riser system were introduced into magma, and the pouring posture of the connecting flange at the top and bottom was respectively used for simulation. The starting temperature was 1580 ℃, and the defect prediction results were obtained, as shown in Fig. 1 and Fig. 2. It...
Fig. 1 shows the current mainstream pump casing casting process. The water system is injected at the parting surface height through risers respectively located at the foundation support and the outlet flange. The casting process gating system has the following defects: (1) The drop of internal water outlet is...