Although advanced equipment is an indispensable factor to ensure product quality, the role of molds in casting is also very important. Especially for aluminum alloy and aluminum alloy auto parts manufacturers, the accuracy and durability of molds have a very obvious impact on product quality.
For ferrous metal casting, the mold is more to form a mold cavity. Generally, the mold itself does not directly contact the molten metal, especially for non-metallic castings with complex shapes. The shape is in contact with the hot molten metal. The material is mainly molding sand, which makes the molding material the main factor affecting the quality of castings. The aluminum alloy gravity casting is different. Because aluminum alloy has a low melting point and good casting performance, in mass production, the shape of the casting is generally directly formed by the mold, such as the aluminum alloy cylinder block and cylinder head of the engine. It is conducive to improving labor productivity, and more importantly, by adjusting the temperature distribution of different parts of the mold to control the structure and grain size of the casting, improve the quality of the casting, and at the same time, avoid environmental pollution caused by the large use of modeling materials. To improve the working conditions of the workshop.
With the different complexity of casting shapes, aluminum alloy gravity casting molds are also different. Even if it is the same part, using different casting processes, the mold form is often different, but no matter what, the aluminum alloy gravity casting mold has its commonality.
First of all, you must choose a suitable casting process. The quality of the casting process is directly related to the quality of the casting and the production rate of the process. Some domestic mold manufacturers have begun to use solidification simulation to assist in the casting process design. Through computer simulation of the filling and solidification process, the hot junction parts that are prone to casting defects are found and overcome, which improves the reliability of the casting process design. It is very important and effective to effectively prevent unnecessary rework of the mold during the debugging process.
Secondly, the mold must have good heat capacity. The thicker mold bases and modules that meet the requirements are not only an effective guarantee for the life of the mold, but also play a very important role in the adjustment of the temperature field during the continuous operation of the mold. Some mold factories, in order to reduce costs and save materials, blindly reduce the effective thickness of the mold to achieve the purpose of reducing weight. They do not realize that this not only greatly reduces the service life of the mold, but also makes the casting easy to deform, which affects the dimensional accuracy of the casting. It will lead to batch scrapping of castings, cause losses to the foundry, and more seriously damage the reputation of the mold factory itself.
