Basic knowledge and maintenance of engineering machinery castings


Release time:

2022-06-13

Construction machinery castings are widely used in many casting products such as mechanical castings. Resin sand, lost foam casting and materials are all good and delicate gray cast iron HT200-HT300, which can be purchased with the correct proportion and higher tensile bending strength.

Construction machinery castings are widely used in many casting products such as mechanical castings. Resin sand, lost foam casting and materials are all good and delicate gray cast iron HT200-HT300, which can be purchased with the correct proportion and higher tensile bending strength.

工程机械铸件

Construction machinery casting gray cast iron parts standard: GB9439-88.

Features of construction machinery castings:

Construction machinery castings have good wear resistance and consumption. The graphite of cast iron is good for lubrication and oil storage, so it has good wear resistance. Also, gray cast iron fires better than steel due to the presence of graphite.

Machine casting process performance is good. Gray cast iron is suitable for casting with complex structure or thin-wall casting, because of its high carbon content, close to eutectic composition, low melting point, good fluidity, and low shrinkage. In addition, graphite is easy to form fragments during cutting, so the processing performance of gray cast iron is better than that of steel.

heat treatment process of engineering machinery castings:

Mechanical casting products are large castings that need to be heat treated to improve their performance and the inherent quality of cast iron castings. Heat treatment of metal materials is one of the key processes of mechanical manufacturing. Heat treatment generally does not change the shape and overall chemical composition of the workpiece, but only changes the internal microstructure of the workpiece or changes the chemical composition of the surface of the workpiece, thus enhancing or improving the characteristics of the workpiece. Its characteristic is to improve the internal quality of the workpiece.

In order to supply the mechanical, physical and chemical properties required for metal workpieces, in addition to the reasonable selection of materials and various forming processes, heat treatment processes are usually required. Steel is a widely used material in the machinery industry, steel microstructure is complex, 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 be heat treated to change the mechanical, physical and chemical properties, resulting in a variety of performance.

Overall heat treatment is a metal heat treatment technology, which heats the workpiece as a whole at an appropriate speed, thereby changing the overall mechanical properties of the workpiece. There are four basic processes for the overall heat treatment of steel: annealing, purification, quenching and tempering.

A simple and effective method for construction machinery castings is to clean up the surface of the castings into dust, expose the rust, guide rails, fixtures, etc. to the outside and moving parts, and after applying rust-proof oil, do not use sweat-stained hands when applying rust-proof oil. Otherwise the fingerprints will rust. Can be directly brush with a brush. The equipment needs to be covered with a cover cloth to prevent the anti-rust oil from absorbing dust. The internal appearance and cavity of the cast iron platform should be painted or sprayed with anti-rust oil, and the external seal should be maintained. If it is operated without leveling, it will deform after a long time and cannot measure the workpiece. The correct method is to use the numerical control pad to adjust and re-operate before use.