Factors Affecting Stainless Steel Casting Parts Quality

In the stainless steel precision casting, the investment mold is a production process with a lot of process steps, and the problems in each link will affect the quality of the casting. At the same time, in the production process of investment stainless steel precision casting, many links are difficult to detect, and the process can only be controlled by the input of raw parameters. Therefore, it is necessary to more accurately grasp the relationship between the process parameters and the actual process of the process, and deeply understand the nature of the process.
1.Stainless Steel Precision Casting Starts With High Quality Melting
Once the casting is to be cast, the smelting process must be prepared, inspected and processed. If required, a lower acceptable standard can be used. However, a better option is to prepare and adopt a melting scheme that is close to zero defects.
2.Avoid Sand Core Pores
Avoid air bubbles from the sand core or sand type entering the cavity metal liquid. The core must be guaranteed to have a very low gas content or a suitable venting to prevent the formation of pores in the core. The glue cannot be repaired with a clay-based core or mold unless it is completely dry.
3.Avoid Turbulent Inclusions On The Free Surface
This requires avoiding excessive flow at the front free surface (meniscus). For most metals, the larger flow rate is controlled at 0.5 m/s. For closed gating systems or thin-walled parts, larger flow rates increase as appropriate. This requirement also means that the drop height of the molten metal cannot exceed the critical value of the "static drop" height.
4. Avoid laminar flow inclusions in the surface of the molten metal.
This requires that the front end of any metal flow should not stop flowing in advance during the entire filling process. Themolten metal meniscus in the early filling stage must be kept in a movable state, and is not affected by the thickening of the surface crust, and these crusts become part of the casting. To achieve this effect, the molten metal front end can be designed to continuously expand. In practice, only the ante "uphill" can achieve a continuous ascending process. (For gravity casting, flow upward from the bottom of the sprue).