Casting technology method for high-rigidity gray iron hydraulic valve body

A casting process and hydraulic valve technology, used in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of poor molten iron purity and uneven metallographic structure, and achieve the effect of strong deformation resistance and high rigidity

Inactive Publication Date: 2010-06-23
SHANGHAI INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0004] The present invention aims to solve the technical problems of poor purity of molten iron and uneven metallographic structure of a hy

Method used

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Embodiment Construction

[0017] The high-rigidity gray iron hydraulic valve valve body casting process method of the present invention comprises the following steps:

[0018] 1. Improvement of casting method: traditionally sand casting, metal casting is now used to increase the cooling speed of the casting, thereby increasing the density of the casting and improving the rigidity and strength of the valve body.

[0019] 2. Carry out low alloying: add a small amount of alloying elements in molten iron to carry out low alloying, the content of added copper is controlled at about 0.5-0.8%, and the content of tin is controlled at 0.04-0.06%.

[0020] 3. Intensified inoculation treatment: The molten iron is inoculated with 0.2~0.3% rare earth silicon alloy when it is released from the furnace, which not only has the function of inoculation, but also has the function of purifying the molten iron. It is also inoculated with the flow when pouring.

[0021] 4. Elimination of casting residual stress: The valve b...

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Abstract

The invention relates to a casting technology method for a high-rigidity gray iron hydraulic valve body, comprising the following steps: 1. adopting metal pouring: increasing the cooling speed of castings when pouring; 2. carrying out low alloying: adding alloying elements into molten iron for low alloying, controlling copper addition to about 0.5-0.8% as well as tin addition to 0.04-0.06%; 3. strengthening inoculation: carrying out inoculation on 0.2-0.3% of rare earth silicon alloy when molten iron is discharged, and carrying out stream inoculation while pouring; 4. eliminating casting residual stress: performing stress relieving annealing or vibration ageing to the valve castings, and eliminating or lowering residual stress in the castings; and 5. high-temperature annealing: carrying out high-temperature annealing before the cast is processed so as to eliminate chill spots and ensure even metallographic structure. The method solves the technical problems of poor molten iron purity and uneven metallographic structure of the hydraulic valve body cast by the high-rigidity gray iron; and the hydraulic valve body cast by the method has high rigidity and strong non-deformability.

Description

technical field [0001] The invention relates to a casting process, in particular to a high-rigidity hydraulic valve body casting process. Background technique [0002] Hydraulic valve is a key component to realize hydraulic transmission and control. It is widely used in various hydraulic systems and is an important basic component for automatic control in the machinery industry. [0003] Hydraulic valve spool clamping is a common phenomenon in hydraulic systems. The spool clamping is not only related to the improper fit clearance and shape tolerance of the valve hole and valve stem, poor processing quality of the valve body and valve stem, and oil pollution. , is also directly related to the rigidity of the valve body casting material. At present, my country cannot stably produce gray cast iron high-pressure hydraulic valve body castings with high enough rigidity and strong enough deformation resistance. A comprehensive analysis of the reasons is mainly due to the poor puri...

Claims

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Application Information

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IPC IPC(8): B22C9/22B22D1/00C21D9/00
Inventor 范金辉剧冬青
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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