Ductile iron casting molds cast liquid metal into a casting cavity that matches the shape of the part. The method of obtaining parts or blanks is called casting. Obtaining castings by casting method is called casting. Guarantee its operational and mechanical function requirements, consider the requirements of casting process and alloy casting function on casting structure, and whether the casting structure planning is reasonable or not has a great impact on the quality, productivity and interest of castings. How is slag inclusion in casting molds produced?

Slag inclusions in casting molds refer to defects formed by dry sand, paint and other inclusions when molten iron enters the casting during the casting process. On the surface of the processed casting, white or dark gray inclusions can be seen, they are distributed individually or in blocks, white is quartz sand particles, black and gray are slag, paints, foam models and other inclusions after pyrolysis.

This defect is often referred to as sand or slag inclusion. This defect is a very common defect in the production of foam castings. Almost factories using lost foam castings are ubiquitous and difficult to remove.

Only by taking various measures and careful operation in each process can the "slag inclusion" be reduced to a very low level, and satisfactory results can be obtained. Before cooling the disappearing foam castings, unpacking them, and not cleaning them, according to the surface condition of the castings and the pouring system, it can be judged whether there are defects in sand transport and slag inclusion.

If the sprue cup, gate, cross runner, gate and gate surfaces or connections, and the surface of the casting are sticky or have crack-like sticky sand, it is basically certain that the casting has slag inclusion and sand entry defects. If you break a straight runner rod or a straight runner tie rod, you can see white spots on the crack, and in severe cases, the crack will form a circle of white spots.

Such castings, especially plate and cake castings, will have white, black and gray spots on the machined surface after processing. If the operating procedures are not strictly controlled, the castings produced can seriously affect the quality of the castings and the progress of order completion.

During the molding process of the mold, another process is deep drawing. At this point, the casting process tests both ends of the raw material to obtain the size of the slab that needs to be formed. The mold is cast here. There are many categories of drawing processes, such as drawing tubes and drawing.

However, the drawing process of the mold has the obvious feature that its accuracy can be very good, but the surface roughness of the mold is also very serious, and usually requires secondary machining and finishing.