The material selection of the silk casting products should be determined according to its use environment and requirements to ensure good heat resistance, corrosion resistance, abrasion resistance and other properties.
The material selection of casting products should be determined according to its use environment and requirements to ensure that the casting has good heat resistance, corrosion resistance, wear resistance and other properties. At the same time, factors such as material processability and cost should also be considered. For example, for machine tool castings, especially the bed and other components, often using gray cast iron, because of its high carbon content, close to the eutectic composition, low melting point, good fluidity, shrinkage is small, suitable for casting complex structures or thin-walled castings. In addition, gray cast iron machinability is better than steel, and its wear resistance and vibration damping is good, the process performance is also better.
In order to ensure the quality and performance of castings, the development of a series of general technical requirements. These requirements include material selection, casting process, heat treatment, machining and surface treatment. Casting process is one of the important factors affecting the quality of castings, attention should be paid to controlling the casting temperature, pouring speed, pouring pressure and other parameters to ensure that the casting density and structure uniformity. Heat treatment is an important step to improve the performance of castings. Common heat treatment methods include annealing, normalizing, quenching, etc. Temperature and time should be controlled to avoid excessive or insufficient heat treatment problems. Machining and surface treatment are also key links, attention should be paid to controlling the processing parameters and treatment parameters to avoid problems such as overcutting or undercutting.
Tolerances for special requirements should be marked directly behind the basic dimensions of the blank parts, such as 95±1. For special requirements, the tolerances can be higher or lower than the general tolerances. When patching large defects with large amount of weld metal, intermediate annealing can be carried out in the welding process to eliminate stress if necessary. Designers should fill in the relevant form according to the technical requirements of the casting, and paste this form on the upper right of the casting drawing.
In summary, the silk casting product material selection and performance requirements involve a number of aspects, including the choice of materials, casting process, heat treatment, machining and surface treatment, etc., these measures work together to ensure the quality and performance of the castings.
