Sand Core And Fixture Casting Mold Manufacturers

Industry knowledge about Sand Core And Fixture

What is the role of heat treatment process of Sand Core And Fixture Casting Mold

In the casting industry, the quality of sand core and fixture casting molds directly determines the yield and performance of castings. As an indispensable part of the mold manufacturing process, heat treatment process plays an important role in improving the performance of molds and extending their service life.
The basic concept of heat treatment
Heat treatment refers to changing the organizational structure of metal materials through physical methods such as heating and cooling to improve their mechanical and physical properties. In the application of casting molds, heat treatment mainly includes processes such as annealing, quenching and tempering, which aim to significantly improve the hardness, toughness, wear resistance and fatigue resistance of molds.
The main role of heat treatment process
Improve hardness and wear resistance
During the casting process, molds are often faced with extreme conditions such as high temperature, high pressure and friction. Through heat treatment, the hardness of the mold is significantly enhanced, thereby improving its wear resistance. This is especially critical for sand core and fixture casting molds because they need to withstand repeated casting cycles. Good wear resistance can not only effectively reduce the wear of the mold, but also significantly extend its service life.
Improve toughness
The toughness of the mold is also crucial. Molds with higher toughness are not prone to brittle fracture when subjected to impact or stress. Through appropriate heat treatment processes, such as tempering, the toughness of the mold can be effectively improved, so that it can maintain stable performance in high-intensity casting environments.
Eliminate internal stress
During the processing of the mold, especially in operations such as cutting and welding, stress may be generated inside the material. These internal stresses may cause the mold to deform or crack during use. Heat treatment can effectively eliminate these internal stresses, thereby ensuring the stability and precision of the mold during use.
Enhance fatigue resistance
The mold undergoes multiple thermal cycles during the casting process, which will cause material fatigue. Through heat treatment, the fatigue resistance of the mold can be significantly improved, and the risk of failure caused by fatigue damage can be reduced, which is crucial for the long-term use and stability of sand core and fixture casting molds.
Improve surface properties
Heat treatment can not only improve the overall performance of the mold, but also improve the hardness and wear resistance of the mold surface through processes such as surface quenching. Excellent surface properties can effectively reduce surface defects of castings and improve the overall quality of castings.
Specific implementation of heat treatment process
Annealing
Annealing is the process of slowly cooling the mold after heating it to a specific temperature. This process can eliminate the internal stress of the mold, improve its cutting performance, and improve toughness. By controlling the temperature and time of annealing, the internal structure of the material can be optimized.
Quenching
Quenching is the process of rapidly cooling the mold after heating it to a high temperature, usually using water, oil or air as a cooling medium. After quenching, the hardness of the mold is significantly improved, but it may cause increased brittleness. Therefore, during the quenching process, the heating temperature and cooling rate need to be precisely controlled to ensure that the mold performance is optimally balanced.
Tempering
Tempering is the reheating of the mold after quenching to reduce its brittleness and improve its toughness. By reasonably controlling the temperature and time of tempering, the hardness and toughness of the mold can be adjusted according to specific needs to meet the requirements of different casting processes.

What is the role of surface treatment of Sand Core And Fixture Casting Mold?

In the casting industry, the surface treatment of sand core and fixture casting molds is a key link to ensure the quality of castings and mold performance. Through scientific and reasonable surface treatment processes, the service life of the mold, the surface quality of the castings and the overall production efficiency can be significantly improved.
Basic concept of surface treatment
Surface treatment refers to the modification of the mold surface by physical or chemical methods to improve its performance. Common surface treatment technologies include sandblasting, polishing, coating, chemical plating and heat treatment. These processes are designed to improve the wear resistance, corrosion resistance and anti-adhesion of the mold, thereby enhancing the overall performance of the mold.
The main role of surface treatment
Improve wear resistance
During the casting process, the mold is often exposed to extreme conditions such as high temperature, high pressure and friction. Through surface treatment processes such as sandblasting and hardening, the hardness and wear resistance of the mold can be significantly improved. Wear-resistant molds can effectively reduce wear and extend service life, thereby reducing production costs.
Improve surface finish
The surface finish of the mold directly affects the quality of the casting. After surface treatment, the mold can effectively reduce defects on the surface of the casting, such as pores and scratches, thereby improving the appearance quality and dimensional accuracy of the casting. Good surface finish can also reduce subsequent post-processing work and improve production efficiency.
Enhance corrosion resistance
During the casting process, the mold is often exposed to various chemicals and high temperature environments, which are prone to corrosion. Through surface treatment processes such as coating and chemical plating, a protective film can be formed on the surface of the mold to enhance its corrosion resistance and extend the service life of the mold.
Reduce adhesion
During the casting process, the casting may adhere to the mold surface, affecting the demoulding of the casting and the use of the mold. Through surface treatment, the adhesion of the mold can be effectively reduced, ensuring smooth demoulding of the casting, and reducing failures and downtime in the production process.
Improve thermal conductivity
The thermal conductivity of the mold has a direct impact on the cooling rate during the casting process. Through surface treatment, the thermal conductivity of the mold can be optimized to ensure uniform cooling of the casting, thereby reducing the incidence of casting defects.
Specific processes of surface treatment
Sandblasting
Sandblasting is a commonly used surface treatment process that impacts the mold surface with high-speed sand particles to remove the surface oxide layer and dirt, while increasing the surface roughness to improve the adhesion of subsequent coatings.
Polishing
The polishing process can significantly improve the surface finish of the mold and reduce surface defects. It is usually suitable for casting molds that require high finish. After polishing, the mold surface is smooth and the surface quality of the casting is significantly improved.
Coating treatment
The coating treatment enhances the wear resistance and corrosion resistance of the mold by coating a layer of protective material on the mold surface. Commonly used coating materials include polyurethane and epoxy resin, which can effectively prevent chemical erosion and wear.
Heat treatment
Heat treatment can not only improve the hardness and toughness of the mold, but also improve the surface hardness of the mold and enhance its wear resistance through processes such as surface quenching. The choice of heat treatment should be reasonably planned according to the material properties and usage requirements of the mold.
Chemical plating
Chemical plating is a process of depositing a metal coating on the surface of the mold through a chemical reaction, which is usually used to improve the corrosion resistance and wear resistance of the mold. The thickness and uniformity of chemical plating can be adjusted according to specific needs to meet the requirements of different casting processes.