Stainless Steel Polished Precision Casting

Stainless steel precision casting needs to go through a series of post-processing after casting. The post-processing is mainly to deal with the surface quality and overall shape of the product. Grinding, fine grinding, shaping, welding repair, electropolishing, grinding and other processes. Today, precision casting Yufeng Metal brings you a detailed introduction to the post-processing of Precision Casting.

1. Products with relatively high surface quality requirements. To be sandblasted. Sand blasting is powered by compressed air, and the sand is blasted on the surface of the casting at a high speed through a spray gun to remove the residual sand and oxide skin remaining on the outer surface and inner hole of the casting. During the cleaning process, shot blasting, sand blasting and rough grinding have no sequence and can be coordinated according to site conditions.

Second, as for those products with thicker walls and complex structures, they are less prone to deformation. For some foreseeable deformation, measures such as cooling tooling and reasonable placement are generally taken in the wax pressing process to prevent it to reduce the deformation rate and repair rate. Coarse grinding is to use abrasive cloth belt to grind the inner gate down to a height of less than 1mm from the surface of the casting. Then fine grinding, according to the products with different surface quality requirements, choose different thickness abrasive cloth belts for fine grinding. When fine grinding, you must concentrate to prevent the surface of the product from being damaged. The products transferred from the inspection workshop to the welding workshop are all products with surface defects.

3. Generally speaking, the surface defects of products can be divided into two categories: protrusions and depressions. Protruding defects include: flash, burr, steel beans or more obvious parting lines, etc. Depression defects include: pores, shrinkage pits, cuts, abrasions, etc. Grinding and welding repair are the repair methods for the two major defects on the surface respectively. Grinding is mainly to use pneumatic air guns, grinders and other grinding tools to install different types and types of grinding heads. Flatten and smooth the protruding defects on the surface of the product. When repairing protruding defects on the large surface of the product, the sanding head is selected, which is faster.

Fourth, there are clear requirements for the type, thickness and blasting pressure of the sand used for sandblasting in the process. Excessive pressure can easily cause damage to the surface of the product. During operation, be careful not to place the casting directly at the mouth of the spray gun to prevent the casting from being sprayed. The surface of the product after sand blasting is much finer than that after shot blasting. However, there are some holes, grooves, grooves and other places where the sanding head cannot repair, and the steel grinding head will be used. Because the steel grinding head is thinner, it will be easier to repair those smaller areas. Weld repair is a repair method for concave defects, such as: pores, shrinkage pits, cuts, abrasions, etc. The purpose of shaping and repairing is the same. It is to repair different types of defects in products in different ways, so that unqualified products are qualified. It is mainly for the correction of shape deformation products. Generally, the products that are easy to deform are some products with simple shapes and thin walls.

The above is a detailed introduction to the post-processing of precision casting. I hope it will be helpful to everyone. If you have any questions about precision casting and precision castings, please contact us.

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