In the process of production of pump and valve castings, it is necessary to effectively control and inspect the quality of the castings. First, it is necessary to formulate the technical rules and technical conditions for the control and inspection of raw materials and auxiliary materials to each specific product. 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.
When the pump and valve castings are used, the appearance quality of the castings is generally used. When using the comparative samples, the surface roughness of the castings can be judged. The fine cracks on 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.
Quality inspection results of pump and valve castings
Casting quality inspection results are usually divided into three categories: qualified products, repair products, and waste products.
1. Qualified goods refer to castings whose appearance quality and internal quality are in conformity with relevant standards or technical requirements for delivery acceptance.
2. Reworked products refer to castings whose appearance quality and internal quality are not in full compliance with the standards and acceptance conditions, but are allowed to be repaired, and can meet the requirements of standard and casting delivery acceptance technical conditions after repair.
3. Waste products refer to unqualified appearance quality and internal quality. Castings that do not meet the requirements of standard and casting delivery acceptance technical conditions are not allowed after rework or repair.