Basic information about agricultural machinery castings?

Agricultural machinery casting products are large castings, in fact, it needs to improve the self-use performance and internal quality of cast iron through heat treatment. Metal heat treatment is an important process in machinery manufacturing, the following for everyone to say the basic information of agricultural machinery castings?

The heat treatment of agricultural machinery castings generally does not change the shape of the workpiece and the overall chemical composition, but changes the internal microstructure of the workpiece or changes the chemical composition of the workpiece surface, thereby giving the workpiece performance. Agricultural machinery castings are characterized by the internal quality of the workpiece. What we need to know here is that in order to provide the mechanical, physical and chemical properties required for metal workpieces, in addition to reasonable selection of materials and various forming processes, heat treatment processes are often the same. Steel is widely used in the machinery industry. The microstructure of steel is complex and can be controlled by heat treatment. Therefore, you will find that the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can change mechanical, physical and chemical properties through heat treatment, and obtain various properties. Moreover, integral heat treatment is a metal heat treatment process that heats the workpiece as a whole and then cools it at an appropriate speed to change the overall mechanical properties. The overall heat treatment of steel consists of four basic processes, namely annealing and purification. Agricultural machinery castings are made of fine gray cast iron, and 45% steel is melted to improve the rigidity of mechanical castings.

Of course, now customers do ductile iron has been very common. The stiffness of nodular cast iron is better than that of gray cast iron, but its damping effect is very different from that of gray cast iron, and the casting cost is much higher than that of gray cast iron. Therefore, ductile iron is not suitable for the main parts of the machine tool, but is more suitable for the casting machine table. In general, the casting cost of agricultural machinery castings is actually very low, gray cast iron has good performance, and it is easy to cast various complex structures. It has good shock absorption performance, which helps to prevent machine vibration and reduce operating noise. The tensile strength is lower than steel, but the compressive strength is similar to steel. The tensile strength of most machine tools is not high enough to meet the performance requirements. In addition, agricultural machinery castings also have good lubrication properties. This is because the pores of gray iron atoms can hold more lubricating oil, while the carbon they contain is self-lubricating. Also because cast iron is more prone to rust than steel, it is easier to maintain the accuracy of the machine guide. The dimensional stability of the machine tool castings is good, and the machine tool body will not be deformed, which helps to maintain the accuracy of the machine tool castings for a long time.

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