What are the cleaning methods for precision castings?

Remove the precision casting from the metal mold casting, remove unnecessary parts, and grind and polish the inner and outer surfaces of the casting.

Core removal and surface cleaning:

It is divided into dry cleaning and wet cleaning. Dry cleaning is the use of industrial equipment to clean precision castings. Ordinary mechanical equipment is simple, highly productive, highly adaptable to different types of castings, and has the advantages of removing cores and reasonably removing surfaces. The disadvantages are Mechanical equipment usually produces smoke, noise and environmental pollution during operation. Wet cleaning has no smoke, but because tap water is a substance, the surface of the castings can easily rust. During the entire work process, a large amount of wastewater and cement sand are produced , causing problems such as sand and water reclamation and sludge treatment.

Common wet and dry cleaning procedures in manufacturing include:

① Clear 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 is to remove the sand inside and outside the casting, polishing and polishing the surface of the casting .In addition, it can also remove part of the burrs. This mechanical equipment can be used for large, medium and small castings with simple appearance and thick wall.

② Shot blasting. Use the impact energy of high-speed moving steel balls, iron, iron balls, and abrasive particle flow to remove cores, sticky sand, polish and polish the surface of castings. In addition, ordinary shot blasting mechanical equipment also includes shot blasting Tables and shot blasting chambers. Shot blasting mechanical equipment used for continuous production includes chain flat shot blasting drums, rotating shot blasting tables, suspended continuous production shot blasting chambers, etc. The operation and maintenance costs of this type of mechanical equipment are relatively low high.

③ Hydropower sand cleaning. High-pressure water is irradiated from the water nozzle to the 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 an open cleaning room, which is composed of channel steel and thick It is composed of steel plates, with a rotating worktable at the bottom and a spray gun installed on the outer wall. It can move left and right and rotate, so that the high-pressure water flow can be irradiated to all positions except the bottom edge of the casting. Sometimes, in order to improve the efficiency of removing sand adhered to the surface of precision castings, quartz sand, etc. Wear-resistant materials are introduced into the appropriate parts of the spray gun to obtain high-speed water-sand flow. This method is often referred to as water-sand cleaning sand.