What are the characteristics of casting?
The casting is more economic blank forming methods, for more complex shape of parts can show its economy. Such as automobile engine cylinder block and cylinder head, propeller and delicate artwork. Some difficult to cutting parts, nickel based alloy parts such as gas turbine with casting method can not be formed.In addition, casting parts of the size and weight of the range is very wide, metal species almost unlimited; in parts of the mechanical properties at the same time, also has the wear resistance and corrosion resistance, shock absorption performance, other metal forming methods such as forging, rolling, welding, punching and so fail to do so.
In the machine manufacturing method used in casting production of parts, the number and tonnage on it is still the most.Casting production often use materials with all kinds of metal, wood, plastic, electric power, coke, gas and liquid fuel and other materials. For a variety of equipment for metal smelting furnace, sand mixing with all kinds of sand mixing machine, various molding machine, core making machine modelling core use, have for cleaning cast shakeout machine, Shotblast machines. There are machines and equipment for special casting and many transportation and material treatment equipment.The production has the different characteristics with other casting process, mainly adaptability, need material and equipment, environmental pollution. Casting production will produce dust, harmful gases and noise pollution of the environment, than other mechanical manufacturing process is more serious, need to take measures to control.
The foundry engineer and mechanical design engineer, heat treatment is a very meaningful, and has very high value to improve material quality, through heat treatment can cast iron and the nature of change or influence, and can obtain higher strength, hardness, wear resistance and improve its ability and so on.Due to different purposes, many types of heat treatment, the basic can be mainly divided into two categories, the first category is the organizational structure is not changed by heat treatment or should not change, the second is the basic organization structure change. The first heat treatment procedures, mainly for the elimination of internal stress, and the internal force system in the process of casting due to cooling condition and different conditions. The organization, strength and other mechanical properties, not because of heat treatment and change significantly.
