Casting method of valve body of check valve
A one-way valve and valve body technology, applied in valve details, control valves, valve devices, etc., can solve the problems of poor manufacturing process of one-way valves, unsuitable for mass production, and prone to cracks, so as to reduce energy consumption and reduce Material consumption and cost input, the effect of improving work efficiency
Inactive Publication Date: 2015-06-03
ANHUI CHUNHUI INSTR CABLE GROUP
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AI Technical Summary
Problems solved by technology
At present, the one-way valve not only has poor material manufacturing technology, but also is not suitable for mass production. The valve stem needs to be finely ground before assembly and use, and cracks are prone to appear during the production process.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0020] A method for casting a check valve body, comprising the following steps:
[0021] a) Casting valve body, the weight percentage of the chemical composition in the control valve body is: 2.30%≤C≤4.15%, 0.40%≤Si≤1.40%, 0.30%≤Mn≤1.30%, 0.010%≤P≤0.030%, 0.010 %≤S≤0.030%. 1.50% ≤ Cr ≤ 2.50%, trace ≤ B ≤ 0.0018%, 0.030% ≤ Zn ≤ 0.060%, the balance is iron and unavoidable impurities; the melt poured into the mold is under vacuum conditions at 20 ℃ / hours, cooled to room temperature;
[0022] b) Preliminary heat treatment: Put the cleaned castings into a heat treatment furnace at a temperature not lower than 180°C and heat them for 10-13 hours to raise the temperature to 650-750°C and maintain this temperature for 2-5 hours; then heat to 8-12 hours to Keep the temperature at 980-1100°C for 26-30 hours, then turn off the burner and let the casting cool down to 200-350°C in the furnace;
[0023] c) After the preparatory heat treatment is completed, the casting is pulled out of ...
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Abstract
The invention discloses a casting method of a valve body of a check valve. The casting method of the valve body of the check valve includes the following steps that: a) the valve body is cast, chemical components of the valve body are controlled to comprise, by weight percentage, 2.30% <= carbon (C) <= 4.15%, 0.40% <= silicon (S) <= 1.40%, 0.30% <= manganese (Mn) <= 1.30 %, 0.010% <= phosphorus (P) <=0.030%, 0.010% <= sulphur (S) <= 0.030%, 1.50% <= chromium (Cr) <= 2.50%, a trace amount <= boron (B) <= 0.0018%, 0.030% <= zinc (Zn) <= 0.060%, and the balance ferrum and other inevitable impurities, and molten liquid poured into a mould is cooled to the room temperature under the vacuum condition at the speed of 10 DEG C / hour; and b) preheat treatment includes that : a well-cleaned casting at the temperature of no less than 180 DEG C is loaded into a thermal treatment furnace for heating for 10-13 hours and raising the temperature to 650-750 DEG C, maintaining the temperature for 2-5 hours, and heated for 8-12 hours, the temperature rises to 980-1100 DEG C and is kept for 26-30 hours, then a burner is closed to enable the casting to be cooled along with the furnace to 200-350 DEG C inside the furnace, and the casting is discharged. According to the casting method of the valve body of the check valve, powder metallurgy materials and manufacturing processes have high production continuity, the utilization rate of materials is high, the casting method is suitable for mass production, and cost is lowered.
Description
technical field [0001] The invention relates to a preparation method of a one-way valve, in particular to a casting method of a one-way valve body. Background technique [0002] The check valve is a control component in the fluid conveying system, which has functions such as flow diversion or overflow and pressure relief. Valves used in fluid control systems range from the simplest cut-off valves to various valves used in extremely complex automatic control systems, with a wide variety of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. At present, the check valve is not only made of poor materials, but also not suitable for mass production. Before assembly and use, the valve stem needs to be finely ground, and cracks are prone to appear during the production process. Contents of the invention [0003] The technical problem to b...
Claims
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IPC IPC(8): F16K27/00F16K15/00C22C38/32C23F17/00
Inventor 沈必亮
Owner ANHUI CHUNHUI INSTR CABLE GROUP