Hydraulic part servo valve body material formula and preparation process thereof

A preparation process and servo valve technology, applied in manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of graphite metal peeling, deep cutting depth, high cutting speed, and achieve the effect of preventing pitting and small holes

Pending Publication Date: 2014-08-06
SHANDONG CHANGLIN MACHINERY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High cutting speed, large amount of feed, and deep cutting depth will increase the cutting force, which will easily cause graphite and the surrounding metal to peel off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation process for a servo valve body of a hydraulic component, the steps comprising:

[0032] 1) Using an electric furnace for smelting, add 15 parts of pig iron, 40 parts of scrap steel, and 20 parts of returned material in the electric furnace in order by weight, and melt; the C content is guaranteed to be 2.8%, and the Si content is guaranteed to be 1.5%;

[0033] 2) After melting, reach 1400-1450°C and then add 0.035 parts of Sn into the electric furnace;

[0034] 3) continue to add 20 parts of ferrochrome in electric furnace again, wherein chromium content accounts for 0.25% of ferrochrome total amount;

[0035] 4) Then continue to add 0.55 parts of copper; that is, electrolytic copper.

[0036] 5) Then carry out the inoculation treatment in three times. When tapping the iron for the first time, add 0.3 parts of silicon-barium inoculant to the ladle, add 0.2 parts of silicon-barium inoculant when pouring the ladle for the second time, and use silicon-stron...

Embodiment 2

[0041] A preparation process for a servo valve body of a hydraulic component, the steps comprising:

[0042] 1) Using an electric furnace for smelting, add 25 parts of pig iron, 60 parts of scrap steel, and 40 parts of returned material in the electric furnace in order by weight, and melt; the C content is guaranteed to be 3.1%, and the Si content is guaranteed to be 1.8%;

[0043] 2) After melting, reach 1400-1450°C and then add 0.025 parts of Sn into the electric furnace;

[0044] 3) continue to add 30 parts of ferrochrome in electric furnace again, wherein chromium content accounts for 0.35% of ferrochrome total amount;

[0045] 4) Then continue to add 0.45 parts of copper; namely electrolytic copper;

[0046] 5) Then carry out the inoculation treatment in three times. When tapping the iron for the first time, add 0.3 parts of silicon-barium inoculant to the ladle, add 0.2 parts of silicon-barium inoculant when pouring the ladle for the second time, and use silicon-stronti...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08B22C9/02
Inventor 高公如钟默张为哲张学春李兵泽柏建雨朱海军刘璐
Owner SHANDONG CHANGLIN MACHINERY GRP
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