Casting mold external member capable of improving quality and technological yield of end cover casting of high-pressure oil cylinder

The invention relates to the technical field of casting, in particular to a casting mold external member capable of improving the quality and the technological yield of an end cover casting of a high-pressure oil cylinder. The casting mold external member comprises a sprue gate connection pipe, a first vertical pouring gate connected with the sprue gate connection pipe, two transverse pouring gates respectively connected with the two ends of the first vertical pouring gate, and a second pouring gate arranged on the transverse pouring gates, wherein a dead head is arranged at the front end of the second vertical pouring gate; high-pressure oil cylinder end cover castings are symmetrically arranged on the two sides of the front end of the second vertical pouring gate. According to the casting mold external member, the size of the dead head is decreased, and the size of the neck of the dead head is increased, so that the feeding flowability of the neck of the dead head can be improved; each dead head feeds two castings; a method for feeding a distance by the dead head is added, so that a casting with higher yield is obtained. Compared with the prior art, the casting mold external member disclosed by the invention is simple in structure, ingenious in design, convenient and practical; the technological yield can be obviously improved; the quality problems of sand holes, shrinkage porosity, shrinkage cavity and the like on the surface of the casting are effectively solved.