Precision castings are processed through the high precision casting process, a method often chosen is aluminum dihydrogen phosphate precision manufacturing, the process is to first select the appropriate molten die raw materials (such as paraffin) to carry out the molten die; followed by fireproof architectural coatings pre-soak and sprinkle fireproof sand on the project investment, so that the shell hard bottoming and dry manic. Melting of the inner molten mould to obtain a concave mould; baking of the mould shell to obtain sufficient compressive strength and burning of the remaining raw material for the project investment; metal material required for high precision casting; dry solid refrigeration and clearing of the sand after breaking the shell to obtain a high precision finished product. Based on the equipment must or heat treatment process, cold working and surface treatment.
For the precision casting parts in the design of the scheme as far as possible to choose to be symmetrical structure, parts of the corridor as far as possible to choose parallel line corridor (for casting), in order to facilitate the structure to bear the force proportional, deformation proportional. Parts casting wall thickness should be as uniform as possible, the articulation should be smooth, can not have a great hard. Some wraparound bars or corners should be articulated with a relatively large inclination as far as possible to prevent internal stresses in the casting and processing stresses. The arrangement of the structural column should be proportional and orderly, whether it is square or ring-shaped, neither too dense (the structure makes it impossible to pour), nor too sparse (the structure is not strong enough), to take into account the characteristics of the bearing force of the casting of the parts, to strengthen the area of the reinforcement plate reinforcement, and the area it should be left as far as possible. Try to avoid processing surface, some unimportant surface or unused surface, do not have to place processing symbols, because the placement of processing symbols on behalf of this side will be pre-buried processing capacity, whether in the casting cost costs or processing costs on the whole is not scratch. Naturally, if a bevelled surface is to be secured, a machining symbol must also be placed. If there are no machining symbols, there is a high probability that there will be no machining capacity in the casting of the part, so the machining symbols must be placed carefully and meticulously. The whole process of casting the part takes into account the setting of the clinical diagnostic surface and centrifugal placement, without the need to have a fully closed concave mould, as this would make it impossible to remove waste sand, etc.
The choice of precision castings for parts and components used in machinery and equipment, machinery and equipment to produce better application of the actual effect, so now the application of precision castings more and more.