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Cast steel valve body casting process method

A casting process and a technology for cast steel valves, applied in the field of casting, can solve the problems of low product yield, unstable product quality, rough product appearance, etc., and achieve the effects of suppressing gas generation, beneficial to scum, and reducing defects

Pending Publication Date: 2022-02-18
HEXIAN KEJIA VALVE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN104942534A discloses a forging production process of a valve body, and the heated steel is drawn through a mold to obtain a valve body blank, and the quality of such a product is unstable, and the finished product has a rough appearance, and the production The products that come out often have pores inside
Chinese patent CN101890477A discloses a casting production process of a valve body. The shape is provided with air-filled holes, but the product yield is low. Those skilled in the art urgently need to develop a casting process for a cast steel valve body to meet the existing use requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First of all, smelting: put the purchased ZG0Cr17Ni12Mo2 steel into the GW-1.5T intermediate frequency furnace, the intermediate frequency furnace is energized to start smelting, and add an appropriate amount of nodulizer and inoculant to the intermediate frequency furnace; The temperature of the intermediate frequency furnace is controlled at 1550°C, and the melting time is controlled at 60 minutes; secondly, pouring: when the melting is completed, the molten iron is introduced into the ladle, and the Y337-4.7m belt conveyor-PD5, 3745B-17.9m bucket elevator -DTI transports it to the pouring area, and then adds the molten iron in the ladle to the sand mold through the pouring port, and pours it in the top column type, in which the temperature is 1550°C and the negative pressure is 0.05MPa; then, cooling: After the pouring is completed, the sand mold, etc. pass through The truss car or trolley system is transported to the cooling room, and the S8860 vibrating boiling cool...

Embodiment 2

[0024]First of all, smelting: Add the purchased ZG1Cr18Ni9 into the GW-1.5T intermediate frequency furnace. The temperature of the furnace is controlled at 1500°C, and the melting time is controlled at 60 minutes; secondly, pouring: when the melting is completed, the molten iron is introduced into the ladle, and the Y337-4.7m belt conveyor-PD5, 3745B-17.9m bucket elevator- DTI transports it to the pouring area, and then adds the molten iron in the ladle to the sand mold from the pouring port, and pours it in the top column, with a temperature of 1500°C and a negative pressure of 0.04MPa; then, cooling: after the pouring is completed, the sand mold, etc. pass through the stringer The car or trolley system is transported to the cooling room, and the S8860 vibrating boiling cooling bed is used for cooling. This cooling process adopts the natural cooling method, and the cooling time is controlled at 1.5h; then, unpacking: after the cooling is completed, open the resin sand mold and...

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PUM

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Abstract

The invention discloses a cast steel valve body casting process method and application thereof, and belongs to the technical field of casting, a valve body of the cast steel valve body casting process method has no defects of sand holes, cracks, serious scouring and the like, an internal pipeline has no impurities and is smooth, the connecting part and threads of the valve body and a cover or a valve element can be flexibly aligned and reset, a valve rod nut on a valve body frame is intact, is flexible to rotate, can be matched with a trapezoidal thread of a valve rod to easily move up and down, is firm and free of looseness with a valve body fixing screw or screw, is smooth and stable in pouring process, is full in mold filling, and does not have the phenomena of gas entrapment, sand inclusion, insufficient pouring and cold shut in the mold filling process. By observing the simulation of the solidification process, it is found that, the defects of shrinkage porosity and shrinkage cavity are easy to occur at an outer side flange far away from a pouring gate. And the casting temperature is adjusted to 1550 DEG C, so that the interior of the casting is almost free of shrinkage porosity and shrinkage cavity.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a casting process method for a cast steel valve body. Background technique [0002] The valve body is a main component of the valve, which is mainly used to adjust or cut off the flow of various media on pipelines such as gas, natural gas, and liquefied petroleum gas for water supply and drainage, so as to prevent the leakage of the media. For this reason, the product usually needs to be inspected Press the test to ensure the compactness of the internal organization. The valve body is a pressure vessel, which can be divided into high pressure, medium pressure and low pressure according to different pressure. It can also be widely used in medium-concentration acid or alkali liquid media in petroleum, chemical, food, fiber and other industries, and the working temperature is below 600 °C. The internal structure of the casting is required to be dense, and casting defects such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D29/02B22D35/04B22C9/22
CPCB22C9/046B22D29/02B22D35/04B22C9/22
Inventor 黎宏倪明主黎思瑶
Owner HEXIAN KEJIA VALVE CASTING