Crutch

The crutch is one of the commonly used parts on machinery and equipment. It is connected with other components by screws to realize functions such as joint movement.

When designing crank arm precision castings, in addition to determining the geometry and size of the casting according to the working conditions and metal material properties, the rationality of the design must also be considered from the perspective of the casting alloy and casting process characteristics, that is, the obvious size Effect and solidification, shrinkage, stress and other issues to avoid or reduce the occurrence of defects such as component segregation, deformation, and cracking of the casting. That is, according to the casting structure, weight and size, casting alloy characteristics and production conditions, select the appropriate parting surface and shape, core making method, and reasonably set the casting rib, cold iron, riser and gating system. To ensure high-quality castings.

The quality of raw materials used in foundry. The quality of metal charge, refractory materials, fuels, fluxes, modifiers and foundry sand, sand binders, coatings and other materials are substandard, which will cause pores, pinholes, slag inclusions, sand sticking and other defects in the castings, which will affect the appearance quality of the castings And internal quality, if serious, the casting will be scrapped. It is necessary to formulate reasonable process operating procedures, improve the technical level of workers, and enable the correct implementation of process procedures.

In casting production, the quality of castings must be controlled and inspected. First of all, we must formulate process rules and technical conditions from raw materials and auxiliary materials to the control and inspection of each specific product. Each process is strictly controlled and inspected in accordance with the process rules and technical conditions. After that, the quality of the finished castings is inspected. To be equipped with reasonable testing methods and appropriate testing personnel. Generally, for the appearance quality of castings, comparison samples can be used to judge the surface roughness of castings; fine cracks on the surface can be inspected by coloring method and magnetic powder method.