The casting mold refers to the mold used to form castings in the casting forming process. The casting molds are matched with the casting process, mainly including gravity casting molds, high-pressure casting molds (die-casting molds), low-pressure casting molds, squeeze casting molds, etc. Casting mold is one of the most important process equipment in casting production, which has a great influence on the quality of castings. The improvement of casting mold technology will be of great significance for improving the quality of castings, developing new castings, and improving the level of near-net processing. The advancement of casting mold technology will provide more precise, complex, and high-quality castings for the national pillar industries such as automobiles, electric power, shipbuilding, rail transit, and aerospace, and promote the improvement of the overall level of my country’s manufacturing industry.
What is the importance of casting molds in sand casting?
In the factory, all castings are made of sand molds, with molds, no molds, that is, no castings. The second is that castings always have the inheritance of molds. The dimensional accuracy of castings, surface roughness and even some casting defects are directly related to the quality of the casting mold.
The casting is manufactured according to the mold, and the dimensional error of the mold will be reflected on the casting without exception. Especially for some complex castings, due to the use of multiple molds, the cumulative error will seriously affect the dimensional accuracy of the castings. The pursuit of zero error in the mold is more important.
Smooth surface of the casting mold can not only improve the demoulding performance, thereby reducing the scrap rate of the core and improve the production efficiency, but also can obtain a smooth cavity or sand core, which is beneficial to obtain a smooth surface casting.
Some casting defects may be caused by poor quality of the casting mold. If the mold surface has a certain degree of backfilling and unevenness, it will cause poor moldability, damage the mold surface and even cause blisters.
Mold installation deviation or positioning pin wear leads to deformation, extrusion, sand hole; random production or installation of the gating system will cause the metal flow to deviate from the process design requirements, which may cause defects such as porosity and shrinkage.
In casting production, the process-casting mold-equipment is an inseparable system, and a good process design depends on the mold.
Similarly, the process design of the a foot may cause a set of well-processed molds to be scrapped because they cannot produce qualified castings. The correct coordination of casting molds and equipment is equally important. Therefore, when determining the process plan and process design, it is necessary to start the preparation of casting molds and equipment at the same time, that is, it is necessary to implement concurrent engineering.
Therefore, some domestic companies introduced core boxes while introducing core manufacturing machines, and introduced some complex molds and process designs.