The datum plane shall be selected as the key point, and the datum plane must be confirmed for the inspection of the die specification of the profiled plate, the drawing of the casting line, and the machining and manufacturing. The internal thread, plan, internal thread and port on the processing of cast aluminum parts can be used as the datum plane. The suitable datum is usually agreed by the three levels of design scheme, production processing and forging. The following points shall generally be taken into account when selecting the datum:

1. The non production processing surface is usually selected for the datum plane of sand mold casting castings. If the production processing surface is selected, it is better to select the surface with less remaining processing.

2. The surface with specified precision in the middle of the surface to be processed shall be selected, and the design scheme datum and manufacturing process datum of parts shall overlap as much as possible.

3. The number of datum planes shall be 6 rigidity of the tube bundle, so three datum planes are usually selected (two datum planes are selected for rotating parts), and the drawing line and production processing shall be the same datum plane.

Whether the processing of aluminum castings is effective or not has great interference with the quality of castings, the necessity and simplicity of production process and its cost. The structure of sand casting castings should conform to the properties of investment casting. Some examples of effective construction of sand mold castings are shown.

In order to better ensure the processing quality of aluminum castings, processing holes must be installed on sand mold castings. Shown are the use cases of machining process ribs. Shown are the reference specifications of the processing rib design scheme. Shown are use cases for machining process holes.

Investment casting can forge very complex parts. In order to better improve the production efficiency and precision, the assembly and welding parts of several parts originally manufactured by other methods can be built into a sand mold casting immediately after slight structural optimization. It shows the structural cases of several parts assembled and welded parts changed to sand mold casting.