Hydraulic part servo valve body material formula and preparation process thereof

Abstract

The invention discloses a hydraulic part servo valve body material formula and a preparation process thereof. The method comprises the following steps of: (1) smelting by adopting an electric furnace, adding 15-25 parts (in parts by weight) of raw iron, 40-60 parts of waste steel and 20-40 parts of foundry returns into the electric furnace for melting; (2) adding Sn in the electric furnace after melting; (3) continuously adding ferrochrome into the electric furnace; (4) then, continuously adding copper; (5) then carrying out inoculation treatment in three steps; (6) pouring liquid-state cast iron into a casting mould cavity of a sand mould to form hydraulic part servo valve body blank. According to the invention, formation of thick sheet-shaped graphite can be prevented, hard spot shaped small holes can be prevented, and mechanical performances of cast iron can be improved.

Description

technical field

[0001] The invention relates to a material formula and a process, in particular to a material formula and a preparation process of a servo valve body of a hydraulic component. Background technique

[0002] The servo valve system is an important control element in the 22-ton hydraulic system, which came into being with the hydraulic servo system. The servo valve body is a typical conversion, amplification, and control element in the hydraulic servo control system. It amplifies and converts the deviation signal given by the original component (electric-hydraulic conversion) into a hydraulic signal (pressure, flow), and controls the hydraulic actuator. (hydraulic cylinder, hydraulic motor, etc.) action. With the development of science and technology, the requirements for the servo valve body are getting higher and higher, especially the requirements for oil pressure leakage in extreme high and low temperature, vibration, impact and other harsh environments. Th...