Scope of application of agricultural machinery castings


Release time:

2022-07-01

Agricultural machinery casting products are large castings, which need heat treatment to improve the self-use performance and internal quality of iron castings. Metal heat treatment is an important process in mechanical manufacturing. Heat treatment generally does not change the shape and overall chemical composition of the workpiece, but changes the microstructure inside the workpiece or changes the chemical composition of the workpiece surface, thus giving the workpiece performance. It is characterized by the internal quality of the workpiece.

   Scope of application of agricultural machinery castings

   Agricultural machinery casting products are large castings, which need heat treatment to improve the self-use performance and internal quality of iron castings. Metal heat treatment is an important process in mechanical manufacturing. Heat treatment generally does not change the shape and overall chemical composition of the workpiece, but changes the microstructure inside the workpiece or changes the chemical composition of the workpiece surface, thus giving the workpiece performance. It is characterized by the internal quality of the workpiece.

农用机械铸件

   Agricultural machinery castings

   In order to provide the mechanical, physical and chemical properties required for the metal workpiece, the heat treatment process is often the same except for the reasonable selection of materials and various forming processes. Steel is widely used in the machinery industry, the microstructure of steel is complex and can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can change the mechanical, physical and chemical properties through heat treatment to obtain a variety of properties.

   Overall heat treatment is a metal heat treatment process in which the workpiece is heated as a whole and then cooled at an appropriate rate to change the overall mechanical properties. The overall heat treatment of steel includes four basic processes, namely annealing and purification.

   Agricultural machinery castings are made of fine gray cast iron, and the gray cast iron is melted with 45% steel to improve the rigidity of the machinery castings. There are also customers manufacturing ductile iron. The rigidity of ductile iron is better than that of gray cast iron, but the 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, and is more suitable for the casting of the machine tool table.

   The advantages of gray cast iron as agricultural machinery castings:

   1. Gray cast iron casting machine has low casting cost, good performance of gray cast iron castings, and easy to cast various complex structures.

   2. Cast iron material has good shock absorption performance, which helps to prevent machine vibration and reduce operating noise.

   The tensile strength of cast iron is lower than that of steel, but the compressive strength is similar to that of steel. The tensile strength of most machine tools is not high enough to meet performance requirements.

   4. The gray cast iron machine bed castings have good lubrication performance. This is because the micropores of gray iron atoms can hold more lubricating oil, and the carbon they contain is self-lubricating.

   5. Cast iron is easier to rust than steel, so it is easier to maintain the accuracy of the machine tool guide. Machine tool castings have good dimensional stability and will not deform the machine tool body, which helps to maintain the accuracy of machine tool castings for a long time. agricultural machinery casting inspection procedures:

   1. If the contract requires magnetic particle inspection, penetration inspection, ultrasonic inspection and radiographic inspection, they shall be carried out according to GB/T9444, GB/T9443, GB/T7233, GB/T5677 or the contract requirements respectively.

   2. The casting manufacturer shall also provide the buyer with an indispensable chemical composition and mechanical performance test report, and attach a casting certificate that meets this standard.

   3. In order to ensure that the castings conform to the provisions of this standard or the contract, the casting manufacturer shall provide the necessary facilities to the inspector of the demand side, but the inspection of the inspector of the demand side shall not affect the normal production of the casting manufacturer.