Method for reducing the weight structure of water pump castings

1. For some casting alloys whose mechanical properties are sensitive to wall thickness, such as ordinary gray cast iron, the method of increasing the wall thickness should be avoided to improve the bearing capacity of the pump castings . For some mechanical properties, the wall thickness is more sensitive. For casting alloys, such as ordinary gray cast iron, the method of increasing the wall thickness should be avoided to improve the bearing capacity of the casting, and the wall thickness of the casting should be adapted to the cast iron grade selected. When the strength of the low grade cast iron can not meet the requirements, the high grade cast iron with high strength grade should be selected, and the wall thickness cannot be increased blindly. Otherwise, the casting can be thick and heavy, waste metal, and the casting performance is still not up to Requirements.

2. Distribute metal + to avoid unnecessary metal accumulation from the need to meet strength and stiffness requirements.

(1) According to the principle of equal strength, the shape of the casting structure is designed, and the structural shape is designed according to the principle of equal strength, which is also the most economical metal structure.

(2) Select the appropriate cross-sectional shape according to the strength and stiffness requirements; the lathe bed has three cross-sectional shapes, and their stiffness ratio is 1:1.9:4 when the weight is the same. Among the various cross-sectional shapes of the pump casting beam, some of the cross-sectional shapes have high bending strength and save material.

(3) A structural feature such as cast iron and magnesium alloy that is compatible with the material properties is that its compressive strength is much higher than the tensile strength. In order to make full use of the material, an asymmetrical cross section should be used to make the casting. The upper compressive stress portion has a smaller cross section and a larger tensile stress.

(4) Eliminate excess water pump castings (http://) metal and replace thin walls of equal thickness with thin walls with flanges or ribs.