Precision Machinery

How should iron castings be cooled during processing?

In the production of iron castings, castings always need to be cold processed before they can be put into use normally. Simply put, the cooling treatment of the casting is the process of reducing the temperature of the casting from high temperature to equilibrium with the ambient temperature. However, it should be noted that before the casting is cooled, it is necessary to pay attention to whether the temperature of each part of the casting is the same. If the temperature is the same, the cooling operation can be carried out normally. Since the wall thickness dissipates heat faster than the wall thickness, if it is cooled at the same time, it may cause damage to the casting. Now I 'd like to share with you some small tips for processing and cooling of casting parts.

Iron casting welding cracks should be how to repair?

Cast iron is a kind of brittle material, which is more difficult to weld, and has higher requirements for welding technology and material selection. In welding, the welding process will change the microstructure of cast iron, and when the fire is concentrated, it is easy to produce high temperature burns, thermal stress and cooling shrinkage. Therefore, it is necessary to select the correct welding method and master a certain technology to avoid causing greater cracks or damage.

What are the methods for determining the strength and hardness of cast iron?

Cast iron is a commonly used metal material, and its strength and hardness are important indicators for evaluating its quality and performance. Accurate determination of the strength and hardness of iron castings is essential to ensure their safety and durability. The following is a detailed description of the strength evaluation and hardness testing methods of cast iron.

How to choose good quality cast iron parts

First, cast iron geometry, size, size effect and solidification, shrinkage, stress. Second, cast iron structure, weight and size. Third, the quality of raw materials for casting iron castings. The substandard quality of metal charge, refractory material, fuel, flux, modifier, casting sand, molding sand binder, paint and other materials will cause defects such as porosity, pinhole, slag inclusion, sand sticking, etc., which will affect the appearance quality and internal quality of cast iron parts, and will cause cast iron parts to be scrapped in serious cases.

Development Status of Mechanical Cast Iron Industry

China's mechanical cast iron industry started in the early 1990 s and developed rapidly with the strong support of China Urban Water Supply Association. After nearly 20 years of practical use, its safety and practicability have been generally recognized by the majority of users. In 2008, the domestic annual output reached 2.2 million tons, 11 times that of 1990. Its quality is directly related to the benefits of industrial production.

What are the preparatory work before casting of construction machinery?

In order to ensure the safe and smooth completion of the smelting, casting operation and casting process of the construction machinery casting production workshop, the whole production process is coordinated and unified. In the process of smelting and pouring production of engineering machinery castings, the staff should obey the command and execute the instructions accurately and quickly to ensure the safe and smooth completion of the whole pouring process.