In considering the above three aspects, the main basis is still the basic principles of general casting process, especially in determining the process plan, the process parameters (such as casting fillet, dial mode gradient, allowances, technology, tendons, etc.),In addition to the specific data due to the characteristics of the investment casting process is slightly different design principles identical with the sand casting.

High dimensional accuracy of castings, generally up to CT4-6 (sand casting CT10 ~ 13, the die-casting CT5 ~ 7), of course, due to the complexity of the investment casting process, many factors affect the dimensional accuracy of castings, such as mold the contraction of the material, the deformation of the molten mold-type shell line the amount of change in the heating and cooling process, the shrinkage of the alloy and the deformation of the casting during solidification, the dimensional accuracy of the ordinary castings, although higher, but its still need to improve the consistency (using high-temperature wax casting size to improve the consistency of a lot).

To suppress the melting mold, the cavity surface finish with high-pressure melting mold surface finish is relatively high. In addition, the type of shell refractory coatings prepared by the special high-temperature binder and refractory coated hanging in the investment casting made??, the cavity in direct contact with the molten metal surface finish. Therefore, the surface finish of castings than the general casting high, usually up to Ra.1.6 ~~ 3.2μm.

The investment casting castings with high dimensional accuracy and surface finish, so I can reduce the machining of the biggest advantages, require a higher area to stay a little allowance can only in part, and even some casting only stay grinding, polishing, margin, and do not have to machining can be used. Thus, using the lost wax casting method can save a lot of machine tool equipment and processing time, a substantial saving of metal raw materials.



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