How are precision castings cleaned after they are formed?

Precision castings are a type of near-machined parts with high dimensional accuracy and are relatively close to or equivalent to the actual size, which can effectively help producers reduce processing costs.
After pouring and molding, after the precision casting is taken out of the cavity, there will be excess impurities or excess parts outside the shape on the surface. At this time, it needs to be cleaned and these excess parts have been removed. The main methods are as follows:

1. Clean the drum. Put the casting and star iron into the ring drum. When the drum rotates, with the help of the casting, star iron and waste sand, they collide with each other. The effect of friction can remove the sand inside and outside the casting, polish and polish Part of the burrs can also be removed from the surface of castings. This mechanical equipment can be used for large, medium and small castings with simple appearance and thick walls.

2. Shot blasting. Use the impact energy of high-speed moving steel balls, iron balls, and abrasive particles to remove cores, sticky sand, polish, and polish the surface of castings. In addition, common shot blasting machinery and equipment also include shot blasting tables and Shot blasting chamber. Shot blasting machinery and equipment used for continuous production and manufacturing include chain flat shot blasting barrels, rotating shot blasting barrels, suspended continuous production shot blasting chambers, etc. The operation and maintenance costs of this type of machinery and equipment are relatively high.

3. Hydropower sand cleaning. Pressurized water is irradiated from the nozzle to the processed casting through the pipeline, and the mechanical energy and flushing effect of the water flow are used to remove the sand attached to the core and castings. Hydropower sand cleaning is generally composed of channel steel and thick steel plates, and the bottom is equipped with a rotating A paint gun is installed on the workbench and exterior wall, which can move left and right and rotate, so that the high-pressure water flow can be irradiated to all positions except the bottom of the casting. Sometimes, in order to improve the efficiency of removing sand adhered to the surface of fine castings, wear-resistant materials such as quartz sand are introduced into the paint The appropriate part of the gun can be used to obtain high-speed water and sand flow.

Among the above methods, roller and shot blast cleaning are often used for precision castings. After cleaning, the shape requirements of the workpiece itself are achieved.