NEWS


The main production and operation of Magang pipe fittings, groove pipe fittings, lining plastic pipe fittings and other related casting products

What is the cause and mechanism of sand sticking in steel parts?

2023-12-11


The sand sticking of the steel is a casting defect caused by metal penetration. It is the result of the destruction of the balance of dynamic pressure, static pressure, friction and capillary force at the interface between the mold and the metal.

The sand sticking of the steel is a casting defect caused by metal penetration. It is the result of the destruction of the balance of dynamic pressure, static pressure, friction and capillary force at the interface between the mold and the metal. This is one of the common defects of steel parts. For negative pressure solid plastic casting, due to the effect of vacuum suction and high temperature pouring, the permeability of liquid metal is much stronger than that of sand casting, and it is easy to penetrate into the mold through the coating. Therefore, the pouring process should pay attention to the following points:

(1) The vacuum degree is too high or the sand compactness near the pattern is poor;

(2) The pouring temperature is too high;

(3) When the coating is too thin or the coating is uneven, the steel parts are prone to sticky sand. Especially when the iron ball is used as a forming material, due to its low fire resistance, it is more likely to produce sticky sand in the large plane, inner hole or other dead angle area of the steel parts.

Due to the particularity of negative pressure molding, dry sand molding and other process molding principles, metal penetration defects are more serious. Some steel parts have not been solved for a long time, which brings difficulties to production. A lot of research has been done on the formation mechanism of metal penetration defects in ordinary sand type steel parts. The magnitude of various forces on metal penetration defects in sand casting is quantitatively analyzed, and the criterion of metal penetration defects-metal penetration coefficient is proposed. The problem of metal penetration defects caused by more pores in the sand mold was studied and solved; the failure mechanism of the coating showed that the physical and chemical dissolution and erosion of the coating by liquid metal and the thermal stress caused by the different thermophysical properties of the simulated material were the two main reasons for the high temperature failure of the coating. The problem of porosity is solved.

There are two differences between negative pressure full mold casting coating and ordinary sand casting coating:

(1) The negative pressure full-mold casting coating is in contact with the molding sand, and the sand casting coating penetrates into the sand mold to a certain depth. The dried coating is nailed in the sand mold and is in close contact with the molding sand particles.

(2) The outside of the coating is dry sand and does not contain binder.

At present, the market size of steel parts is growing. The steel parts are part of the construction machinery. Many construction workers know little about some of the characteristics of steel fasteners. They only know that steel fasteners are indispensable parts and do not know what characteristics they have. The following small series will be briefly introduced to you.

The steel fastener wholesale plant is an important part of ensuring the safety of construction machinery and protecting personnel and equipment. Its low cost, large role, is an essential part of the construction. Steel fasteners have different characteristics in different models, and their tensile strength is also different. Under different conditions of use, different types of steel fasteners can be selected to ensure their efficiency.

First of all, the fasteners of the steel parts have a safety guarantee function. In terms of anti-skid function, it also ensures that the steel pipe will not slip under the bonding state with the building fastener. In the maintenance of steel parts, the whole building fasteners are galvanized passivation double anti-rust treatment, with strong anti-rust ability and long service life. Therefore, it will not rust and damage, and the maintenance after construction is also very convenient, which greatly reduces the maintenance cost.

Key words:

Masteel

RELATED INFORMATION


How to do anti-corrosion measures for steel parts?

Whether the anti-corrosion work of the steel parts can be done well will play a vital role in the project, which will not only affect the quality of the whole project, but also affect the progress of the project.

2023-12-11

What is the cause and mechanism of sand sticking in steel parts?

The sand sticking of the steel is a casting defect caused by metal penetration. It is the result of the destruction of the balance of dynamic pressure, static pressure, friction and capillary force at the interface between the mold and the metal.

2023-12-11

Problems needing attention in the installation of grooved pipe fittings

Groove pipe fittings using groove type pipe joint connection in various types of construction installation gradually popular, its fast and reliable characteristics of the installation industry colleagues recognized, Shanxi groove pipe fittings in fire engineering construction has also been widely used.

2023-12-11