The Physical Properties Of The Castings

- May 27, 2017 -

Casting is widely used, has been applied to the hardware and the entire machinery and electronics industry, and its use is to continue to expand the trend.

The use of large-scale machinery, Casting Parts machine tools, ships, aerospace, automotive, motorcycle, electronics, computers, electrical appliances, lighting and other industries, many are ordinary people all day contact, but do not understand the Metal objects.

Mainly including the appearance of quality, intrinsic quality and quality of use. The internal quality refers to the chemical composition, physical properties, mechanical properties, Casting Parts microstructure of the casting and the holes, cracks and inclusions present in the casting. The internal quality of the castings is such that the surface roughness, surface defects, size deviation, shape deviation and weight deviation. Such as wear resistance, corrosion resistance, chilling heat, fatigue, shock absorption and other properties as well as the machinability, weldability and other process performance.

Casting quality has a significant impact on the performance of mechanical products. For example, Casting Parts the wear resistance and dimensional stability of the machine tool casting directly affect the accuracy of the machine to maintain the life of various types of pump impeller, shell and hydraulic parts of the cavity size, profile accuracy and surface roughness, a direct impact on the pump And the hydraulic system work efficiency, energy consumption and the development of cavitation; internal combustion engine cylinder block, Casting Parts cylinder head, cylinder liner, piston ring, exhaust pipe and other casting strength and resistance to cold heat, directly affect the engine life.

The market is the consumer of the consumer, its ability to demand will become the only standard for the production of enterprises, enterprises should be based on market capacity. Therefore, the enterprise market survey is particularly important, it is used to connect the consumer bridge, Casting Parts is the final product sales paving stones.

Casting products market research, casting companies can make arrangements before the production, fully understand the situation of the casting consumer market. Such as the demand for castings, the type of demand, the requirements of manufacturers, product requirements and other information. Casting Parts In the large amount of information, the casting production enterprises can choose their own and the consumer market in the field of production; if not suitable, the enterprise also has enough time for production adjustment, the production market needs casting products, thus effectively prevent casting production capacity excess.

There are many factors that affect the quality of castings, the first is the casting process design process. In order to determine the casting geometry and size according to the working conditions and the properties of the metal material, it is necessary to consider the rationality of the design from the viewpoint of casting alloy and casting process characteristics, that is, the obvious size effect and solidification and shrinkage , Casting Parts Stress and other issues, in order to avoid or reduce the composition of the casting segregation, deformation, cracking and other defects. The second must have a reasonable casting process. According to the casting structure, weight and size, casting alloy characteristics and production conditions, select the appropriate sub-surface and shape, core method, the rational set of casting tendons, cold iron, riser and pouring system. To ensure access to high quality castings. The third is the quality of raw materials for casting. Metal inclusions, refractories, fuels, fluxes, Casting Parts modifiers and foundry sand, sand binder, paint and other materials, substandard quality, will make the castings produce pores, pinholes, slag, sticky sand and other defects, affecting the appearance of casting quality And the internal quality, serious castings will be scrapped. The fourth is the process operation, to develop a reasonable process of operation procedures to improve the technical level of workers, so that the correct implementation of the rules.

Casting production, the quality of the casting to control and inspection. First of all to develop from the raw materials, auxiliary materials to each specific product control and inspection of the code and technical conditions. For each process are strictly in accordance with the code of practice and technical conditions for control and testing. Finally, the finished product for quality inspection. Casting Parts To be equipped with a reasonable detection method and the appropriate detection staff. Generally, the appearance quality of the castings can be used to determine the surface roughness of the castings. The fine cracks on the surface can be checked by the coloring method and the magnetic powder method. The internal quality of the castings can be checked and judged by methods such as audio, ultrasound, eddy currents, X-rays and gamma rays.

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