Dongguan Precision CastingScope and method of machining parts cleaning The process of removing the precision casting from the mold, shoveling the remaining part except the body, and polishing the surface of the casting.

De-coring and appearance finishing:

Divided into two types, dry and wet. Dry finishing is the finishing of castings using mechanical equipment. The equipment used is simple, the production efficiency is high, the adaptability to different types of castings and the advantages of not only removing the core but also effectively finishing the appearance. The disadvantage is that the equipment is often dusty, noisy, and pollutes the environment. There is no dust in wet finishing, but because water is used as a medium, the surface of the casting is easy to rust. During the operation, a large amount of sewage and sand with cement are produced, which brings about the problems of sand and water regeneration and sludge treatment.

The dry and wet finishing methods commonly used in production are:

①Roller finishing. willPrecision cast steelThe casting and the star iron are put into the round drum together. When the drum rotates, the impact and friction between the casting, the star iron and the waste sand are used to remove the sand on the surface and the inside of the casting, polish the appearance of the casting, and also partially remove the flash and burrs. . This type of equipment is suitable for finishing small and medium-sized castings with simpler shapes and thicker walls.

② Shot blasting finishing. The impact force of high-speed steel shot, iron shot, and abrasive flow is used to remove the core, sticky sand, and polish the appearance of the casting. In addition, the commonly used shot blasting equipment includes shot blasting table and shot blasting room. The shot blasting finishing machinery used for continuous production includes chain plate shot blasting drum, continuous shot blasting finishing table, suspended continuous production shot blasting finishing room, etc. The operation and maintenance cost of this kind of equipment is relatively high.

③Hydraulic sand removal. The high-pressure water is shot from the nozzle of the gun to the processed castings through the pipeline, and the kinetic energy of the water flow and the scouring effect are used to remove the core and castings sticky sand. Hydraulic sand cleaning is usually equipped with an open sorting room composed of section steel and steel plate. The bottom is equipped with a reversing workbench. The spray gun is installed on the side wall, which can move up and down and reverse, so that high-pressure water can be sprayed to anything except the bottom surface of the casting. Location. Sometimes in order to improve the efficiency of removing sticky sand on the surface of precision castings, abrasives such as quartz sand are introduced into the appropriate position of the spray gun to obtain high-speed water sand flow. This method is generally called water sand cleaning.

④ Water explosion to clear the sand. After the casting mold is poured, the casting is boxed when it is cooled to a regular temperature. When it is immersed in the pool, water enters the mold through all gaps and contacts the high-temperature metal rapidly, vaporizing and blasting. The shock wave can basically remove the sand attached to the surface and the inside of the casting. The water explosion sand cleaning method has the advantages of short operation time and high efficiency, and has been widely used in steel casting workshops in my country. generallyLost wax castingIt is used to process steel castings with simpler shapes below 0.35% carbon content.