The characteristics of the foundry industry

       Foundry industry is the economic blank forming method, for the complex shape parts more can show its efficiency. Such as automobile engine cylinder block and cylinder head, Marine propeller and exquisite works of art, etc. Some hard cutting parts, such as gas turbine of nickel base alloy parts forming without casting method. In addition, the size and weight of casting parts to adapt to the range is very wide, almost unlimited metal species; Parts in the general mechanical properties, but also has wear-resisting, corrosion resistance, shock absorption, such as comprehensive performance, is other metal forming methods, such as forging, rolling, welding, punching, etc. So using produced by the method of casting blank parts in the machine manufacturing industry, on the number and tonnage so far is still the most.
      Casting production often want to use the material with various metals, electricity, coke, wood, plastic, gas and liquid fuels, such as molding materials. Required equipment with various furnace smelting metal, with all kinds of sand sand mixer, a core making use of the various molding machine, core making machine, cleaning castings with shakeout machine, shot blasting machine, etc. And for special casting machinery and equipment, and many transportation and materials handling equipment.
      Casting production have different characteristics with other process, mainly is the wide adaptability, more materials and equipment will be needed, pollute the environment. Casting production will produce dust and harmful gas and noise pollution to the environment, compared with other mechanical manufacturing process is more serious, need to take measures to control it. For casting engineers and mechanical structure design engineer, heat treatment is a very meaningful, and with a very high value to improve the method of material quality, through heat treatment can change or influence the organization and properties of cast iron, and can obtain higher strength, hardness, and improve the wear resistance and so on. Because the purpose is different, very many different kinds of heat treatment, basic can be mainly divided into two categories, the first kind of organization structure is not changed by heat treatment or should not be changed, the second is the basic organizational structure change. The first heat treatment procedure, is mainly used to eliminate internal stress, and the internal stress is in the process of casting due to different cooling condition and conditions. Organization, strength and other mechanical properties, no obvious changes due to heat treatment. For the second heat treatment, al qaeda has had the obvious change, can be roughly divided into five categories: (1) the softening annealing: its purpose is to decompose the carbide, its hardness is reduced, and improve the processing performance, for nodular cast iron, its aim is to gain more ferrite. (2) the normalizing treatment: main purpose is to obtain the pearlite and improve casting machinery 螚 sorbite organization. (3) hardening: mainly in order to obtain a higher hardness and abrasion strength, at the same time to the surface of the high wear-resisting properties. (4) surface hardening treatment: mainly for surface hardening layer, and received very high surface wear-resisting properties.