Pump body sand casting are mainly designed with reasonable process. The inner runner is located in the relatively thin wall of the machine tool castings, so that the first molten metal entering the thick wall is first solidified, and the thin wall is solidified afterwards. Basically reached equilibrium solidification. For machine tool castings with uniform wall thickness, multiple gates and vents are used. There are many internal runners, scattered and evenly distributed to balance the overall heat. The venting holes are fine and numerous, that is, the exhaust gas is smooth and heat-dissipating.
The pump body sand casting are burnt at a low temperature, and the pouring system is mainly used in the operation, so that the molten metal can be filled with the mold quickly, smoothly and evenly. This should be tailored to the requirements. When you need a riser, when you first move to the hot mouth, and leave the hot festival. If the riser is placed on a hot section, the size of the riser will be increased to form a "hot heating".
The quality of the pump body sand casting is controlled and inspected, and to a certain extent, the process codes and technical conditions for the control and inspection of raw materials and auxiliary materials to each specific product are first formulated. Each process is strictly controlled and tested according to the technical code and technical conditions. Finally, the quality of the finished castings is checked. Be equipped with reasonable testing methods and appropriate inspectors. Generally, for the appearance quality of the casting, the comparative sample can be used to judge the surface roughness of the casting; the fine crack of the surface can be inspected by the coloring method and the magnetic powder method. The internal quality of the casting can be checked and judged by means of audio, ultrasound, eddy current, X-ray and gamma ray.http://www.pump-casting.com/