Kneel for casting and coating formula?

The traditional casting coating only plays a role of blocking and isolating between the casting and the mold, so as to achieve the purpose of preventing sand sticking. However, due to poor adhesion, low strength, poor fire resistance and large gas generation, ordinary casting coatings are easy to cause defects such as sand sticking, sand holes, pores and carbon slag.

The reason why the castings stick to sand is that the coating does not play an effective role in blocking and isolating, or the coating reacts chemically with high-temperature metal liquid.

1. Poor adhesion of coating: sand-filling vibration causes coating to peel off, resulting in sand sticking of castings.

2. The coating has a large expansion coefficient: when it comes into contact with high-temperature metal liquid, the coating leaves the mold due to the expansion of the heated volume, causing the casting to stick to sand.

3. High-temperature liquid metal is oxidized and chemically reacts with coating and mold to generate metal oxide, which has strong adhesion to both coating and molding sand, and can make molding sand firmly adhere to the surface of the casting, forming a series of low-melting-point compounds (there are many low-melting-point substances in the thick wall and corner of the casting, and the sand layer is worse), resulting in sand sticking to the casting. Sometimes, although there is no sand sticking, a layer of paint that is difficult to remove will be attached to the surface of the casting, resulting in sticky ash.

Casting sand holes:

1. There is falling sand in the mold.

2. The coating has low strength and poor fire resistance, and can't stand the erosion of high-temperature molten metal, so molding sand is involved in casting.

There are many reasons for porosity in castings. The most common ones are that there are many substances with large gas generation in the mold, the gas generation speed is fast, the permeability of paint or sand is poor, and the gas is not removed in time.

The new casting coating developed by our factory is improved and adjusted on the basis of the traditional casting coating, which can effectively prevent the oxidation of high-temperature liquid metal and does not react chemically when it comes into contact with molds and high-temperature liquid metal. And digest gases containing nitrogen, sulfur, carbon and the like.

Thereby completely solving the following problems:

Sand sticking of castings,

Casting sand holes,

The casting is rough,

Casting porosity,

Casting inclusions [slag],

Changes of ball-milled cast iron,

Sulphurizing crack of cast steel,

Carburizing defects, etc.

We provide samples free of charge and pay after the trial is satisfactory. At the same time, the price is guaranteed to be low throughout the country. I hope that friends in need can contact me at telephone number 139539, with the tail number 17723 Yao Jingli.

The products mainly include:

Ordinary cast iron-casting coating,

Gray cast iron-casting coating,

Ball milling cast iron coating,

Carbon steel casting coating,

Alloy steel casting coating,

Gaoluogang-casting coating,

Coating for high manganese steel castings,

Stainless steel casting coating,

Copper alloy casting coating,

Aluminum alloy casting coating,

Magnesium alloy casting coating.