Process method for forming grooves in gravity casting mold cavity surface

The invention discloses a process method for forming grooves in a gravity casting mold cavity surface. According to the method, a plurality of process grooves which do not influence work of the mold are formed in the gravity casting mold cavity surface corresponding to a defective part of a cast product; a plurality of small, thin and long ribs which cannot influence use of a casting are formed in corresponding positions of the surface of the casting after pouring is finished, and the sections of the ribs are semi-circular; the number, the length and the diameter of the process grooves depend on the size and the category of the defective part of the cast product. The method is low in cost, simple and convenient to use, solves the problem about defects of the cast product, such as shrinkage cavities caused by hot spots, pores caused by poor exhaust, cracking caused by stress concentration and the like in the gravity casting process, the effect is remarkable, the production efficiency of an enterprise is improved, and the economic benefits of the enterprise are effectively increased.