A hydraulic pilot valve body casting and its mold

Abstract

The invention discloses a hydraulic pilot valve body casting.The hydraulic pilot valve body casting comprises a valve body and a valve base, wherein the valve body is cylindrical, the valve base is square, seven vertical runners are arranged inside the valve body, and seven runner ports corresponding to the seven vertical runners are formed in the top of the valve body.The invention further discloses a hydraulic pilot valve body casting die.A sand core is formed by assembly of a main core body and a plurality of small core bodies, wherein the main core body comprises a left core and a right core, a hollow portion used for gathering gas is defined by the left core and the right core after bonding formation, and a vertical exhaust port is formed in the top of each small core bodies.A sprue cup and a dead head are arranged at the upper end of a shell mold, the bottom of the dead head is connected with the upper end of a mold cavity, and the sprue cup is connected with the lower end of the mold cavity through a pouring gate to be used for injecting pouring liquid from the bottom of the mold cavity.The number of air holes in the surface of the hydraulic pilot valve body casting is small, and core breaking portion during casting is small.

Description

technical field [0001] The invention relates to the field of valve body castings and molds thereof, in particular to a hydraulic pilot valve body casting and molds thereof. Background technique [0002] Hydraulic pilot valve body castings are mainly used in the hydraulic control system of large loaders. As a key component of the hydraulic system of construction machinery, it has the advantages of high integration, strong reliability, and long life, and has a good market prospect. However, my country's industry is large but not strong, and the current situation of overcapacity of low-end and mid-range products and almost complete reliance on imports of high-end hydraulic components needs to be resolved urgently. [0003] The existing hydraulic pilot valve body castings have the following disadvantages: 1. There are many air holes on the casting, and the reject rate caused by the plane air holes reaches more than 70%. The diameter of the sand core is only 5 mm, so it is diffi...

AI Technical Summary

Problems solved by technology

[0003] The existing hydraulic pilot valve body castings have the following disadvantages: 1. There are many air holes on the casting, and the reject rate caused by the plane air holes reaches more than 70%. The diameter of the sand core is only 5 mm, so it is difficult to quickly discharge the gas from the middle sand core to the outside of the mold, and a large part of the gas will invade into the mold to form pores in the casting; The sand core in the part is relatively large, with a thickness of about 20 mm, while the sand core connected to the central part of the sand is very small, with a diameter of only about 5 mm. High proportion of broken cores

Images