Method for casting butterfly valve body

A technology of butterfly valve and inner core, which is applied in the casting field of butterfly valve body, which can solve the problems of difficulty in guaranteeing the shrinkage ratio of molten steel, lower valve sealing performance, poor corrosion resistance and poor stability, etc.

Inactive Publication Date: 2011-10-19
HENAN YUXING CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the butterfly valve body is widely used in the field of sealed pipelines in the petrochemical industry. As the diameter of the sealed pipeline increases, the diameter of the butterfly valve body gradually increases to more than 2 meters. We call the butterfly valve body with a diameter greater than 1.8 meters. Large valve body structure, there is no special casting equipment for large butterfly valve body, because theoretical analysis shows that: butterfly valve body 11 has a large diameter and flanges 12 at both ends, it is difficult to control the surface quality and roundness after molding, and casting In the process, it is difficult to guarantee the shrinkage ratio of molten steel, that is to say, it is difficult to control the shrinkage ratio of the flanged end and the flangeless end at the same temperature, so it is easy to appear out of round and cracks during the casting process. The large-scale butterfly valve bodies sold are all welded by steel plates. The welded butterfly valve bodies have the following disadvantages: low durability, poor corrosion resistance and stability, which seriously reduces the sealing performance of the valve. The valve company often has to shut down for maintenance

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  • Method for casting butterfly valve body
  • Method for casting butterfly valve body
  • Method for casting butterfly valve body

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Experimental program
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Effect test

Embodiment 1

[0034] Step 1. Make the inner core structure: the annular inner core is composed of multiple fan-shaped inner core boxes,

[0035] The inner core box uses sodium silicate sand as raw material. After the mold for making the inner core box is fixed, a plurality of cold irons are evenly arranged in the mold groove. The number of cold irons is reasonably determined according to the working area of ​​the inner core box. Fill the mold groove with glass sand. After the surface is flattened, insert the nozzle with carbon dioxide gas into the mold groove. After 2 minutes, the carbon dioxide gas and water glass sand fully react and the water glass sand hardens. Remove the mold and the sand blank is completed. For future use; apply zircon powder coating on the working surface of the molded sand blank with a thickness of 1.5 mm, and ignite it at room temperature until it goes out naturally; finally use a liquefied gas spray gun to bake the working surface of the sand blank at a temperature...

Embodiment 2

[0042] Embodiment two: the casting method of butterfly valve valve body, it is characterized in that: concrete steps are as follows:

[0043] Step 1. Making the inner core: After fixing the mold for making the inner core box, set the cold iron evenly in the mold groove, then fill the mold groove with water glass sand, level the surface of the water glass sand, and insert the vent pipe into the mold groove , inject carbon dioxide gas, stop the ventilation after 3 minutes, remove the mold, and prepare the sand blank for use; apply zircon powder coating on the working surface of the sand blank, and the thickness of the coating is 2.5 mm, and ignite the sand blank at room temperature until it is naturally Extinguished; finally use a spray gun to bake the working surface of the sand blank, the baking temperature is 1200 ℃, and the baking time is 3 minutes; repeat the process of applying paint, lighting and baking in this step twice, and make a single inner core box After completion...

Embodiment 3

[0049] Embodiment three: the casting method of butterfly valve valve body, it is characterized in that: specific steps are as follows:

[0050] Step 1. Making the inner core: After fixing the mold for making the inner core box, set the cold iron evenly in the mold groove, then fill the mold groove with water glass sand, level the surface of the water glass sand, and insert the vent pipe into the mold groove , inject carbon dioxide gas, stop the ventilation after 2.5 minutes, remove the mold, and prepare the sand blank for use; apply zircon powder coating on the working surface of the sand blank, and the coating thickness is 2 mm, and ignite the sand blank at room temperature until it is naturally Extinguished; finally use a spray gun to bake the working surface of the sand blank, the baking temperature is 1000 ℃, and the baking time is 3 minutes; repeat the process of applying paint, lighting, and baking 3 times in this step, and make a single inner core box After completion, ...

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Abstract

The invention relates to a method for a casting butterfly valve body, comprising the steps of: 1, manufacturing an inner core: forming an annular inner core structure for later use by utilizing a plurality of fan-shaped inner core boxes; 2, manufacturing an outer core boxes according to the method in the step 1: forming an annular outer core structure for later use by utilizing a plurality of fan-shaped outer core boxes; 3, manufacturing a mould base for later use; 4, concentrically arranging the inner core and the outer core on the mould base; 5, reasonably adjusting the positions of the inner core and the outer core, planishing water-glass sand in the inner core and drying by utilizing carbon dioxide gas for later use; and 6, completing pouring molten steel within 1.5-2.5 minutes through a pouring opening on an sealing cover, holding the temperature for 7 hours and completing the casting. The method has the advantages of simple preparation process, reasonable design and short processing time, the production efficiency increased by more than 50%, guaranteed stability of the molded butterfly valve body, better roundness, no cracks on the surface and greatly enhanced tightness of the valve.

Description

[0001] technical field [0002] The invention relates to a casting method, in particular to a casting method of a butterfly valve body. Background technique [0003] At present, the butterfly valve body is widely used in the field of sealed pipelines in the petrochemical industry. As the diameter of the sealed pipeline increases, the diameter of the butterfly valve body gradually increases to more than 2 meters. We call the butterfly valve body with a diameter greater than 1.8 meters. Large valve body structure, there is no special casting equipment for large butterfly valve body, because theoretical analysis shows that: butterfly valve body 11 has a large diameter and flanges 12 at both ends, it is difficult to control the surface quality and roundness after molding, and casting In the process, it is difficult to guarantee the shrinkage ratio of molten steel, that is to say, it is difficult to control the shrinkage ratio of the flanged end and the flangeless end at the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D15/00
Inventor 范建超辛金福仝长河杜朝玉付银团张本政
Owner HENAN YUXING CASTING
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