How to avoid the shrinkage problem of stainless steel castings in investment casting
Research on the problems existing in the process of shrinking and filling by traditional methods, and continuously improve the treatment effect of reducing the shrinkage problem of stainless steel castings in the precision casting industry, reduce risks, and effectively avoid dangerous factors. Reduce costs as much as possible.
Research on the problems existing in the process of shrinking and filling by traditional methods, and continuously improve the treatment effect of reducing the shrinkage problem of stainless steel castings in the precision casting industry, reduce risks, and effectively avoid dangerous factors. Reduce costs as much as possible, improve the capital income of the enterprise, expand the delivery rate of product technology, and reduce the consumption of labor costs in the process of shrinking and replenishing. Continuously improve the shrinkage porosity repair technology of stainless steel thin-walled multi-hot joint castings, and adopt new methods for repairing to improve the export rate of products.
The specific raw material used by the new method is graphite sand, because graphite sand can react at high temperature, and its heat preservation effect is very good. When the temperature rises, it can absorb heat and can be stored for a long time. When it is lowered, the graphite sand volatilizes its own heat to achieve the effect of heating up, which is a very good choice of raw materials. Moreover, the melting point of graphite sand is relatively high, and it can melt under high temperature conditions, which means that the stone frosting does not expand under extremely high temperature, but is melted by high temperature. Its expansion coefficient is very small, even if the temperature continues rise, and no swelling will occur. Moreover, its thermal conductivity is very good. Once it is in a high temperature state, its own performance will change with the change of the environment. When the temperature continues to rise, graphite will adjust its own temperature, gradually with the The temperature rises to reduce its own temperature to prevent other effects from overheating.
The stability coefficient of graphite is good, and it will not produce large fluctuations according to the change of external temperature. Whether it is in the adjustment of temperature or in the change of its own volume, it can show a stable state, and its volume will not change with It increases with the increase of temperature, but can maintain a stable volume under continuous high temperature, which is also the main reason for choosing graphite sand as the raw material for shrinkage. Graphite sand is selected for shrinking and filling of stainless steel castings, so that the stability of the shell is relatively good, and it will not break with the change of external temperature, which promotes the stability of the shell to be improved. When the shell of the product is poured at high temperature, the thermal conductivity of graphite is better, so it will not affect the product due to high temperature, avoid the influence of dangerous factors, and keep the overall shell insulated to prevent the temperature difference being too large. Crack occurs. After the casting is completed, the product needs to be taken to the outside for cooling. During the cooling process, if the shell raw material is made of temperature-sensitive materials, the shell will easily crack. The heat conduction and heat preservation of graphite The performance is relatively good, and choosing such raw materials can effectively avoid this risk.
At the same time, when pouring and repairing, the staff should shorten the industrial process as much as possible, reduce the production cost for the production and development of the enterprise, so as to improve the economic interests of the enterprise and better realize the long-term and stable development in the later period. The technical level and professional quality of the personnel should be intensively trained to prevent the low quality of the staff, so that the products cannot be effectively processed and repaired with high precision. Especially in the investment casting industry, the requirements for products are very strict, and only when they reach the level of precision casting can they be shipped and promoted.