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Manufacturing process of core assembly for butterfly valve body

A preparation process, butterfly valve technology, applied in the direction of manufacturing tools, cores, casting and molding equipment, etc.

Active Publication Date: 2011-11-23
HENAN YUXING CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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. The butterfly valve body with a diameter greater than 1.8 meters is called a large valve. Body structure, the overall mold is usually used to cast small size butterfly valve body, and there is no specific casting equipment for large butterfly valve body, due to the large diameter of the valve body and flanges at both ends, it is difficult to guarantee the shrinkage ratio of molten steel during casting , Oval and cracks are easy to appear in the casting process. At present, the large butterfly valve bodies on the market are all welded by steel plates. The butterfly valve bodies formed by welding need subsequent finishing. At the same time, the sealing effect of the welded butterfly valve bodies is Poor, poor corrosion resistance, poor stability, short service life, not conducive to use and promotion, due to the need to stop for maintenance, increase production costs and reduce production efficiency

Method used

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  • Manufacturing process of core assembly for butterfly valve body
  • Manufacturing process of core assembly for butterfly valve body
  • Manufacturing process of core assembly for butterfly valve body

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preparation example Construction

[0029] A preparation process for butterfly valve body assembly core, the preparation process is:

[0030] Step 1. Evenly set multiple pieces of cold iron 3 in the fixed inner core box mold, fill the inner core box mold with water glass sand and smooth the surface of the water glass sand, and then insert the pipeline with carbon dioxide into the In the mold cavity of the mold, carbon dioxide is introduced, and after 5-10 minutes, the carbon dioxide is stopped, and the mold is removed to obtain the blank of the inner core box;

[0031] Step 2: Apply 1-2mm zircon powder paint on the surface of the inner core box blank, ignite the zircon powder paint on the surface of the inner core box blank, and burn until the flame goes out naturally;

[0032] Step 3, repeat step 2 for 2-3 times, then dry the inner core box blank to obtain a fan-shaped inner core box 2 for future use;

[0033] Step 4, uniformly arrange a plurality of cold irons 3 in the fixed outer core box mold, fill the wate...

Embodiment 1

[0043] A preparation process for butterfly valve body assembly core, the preparation process is:

[0044] Step 1. Evenly set multiple pieces of cold iron 3 in the fixed inner core box mold, fill the inner core box mold with water glass sand and smooth the surface of the water glass sand, and then insert the pipeline with carbon dioxide into the In the mold cavity of the mould, feed carbon dioxide, stop feeding carbon dioxide after 5 minutes, remove the mould, and obtain the blank of the inner core box;

[0045] Step 2, smearing 1 mm of zircon powder paint on the surface of the inner core box blank, igniting the zircon powder paint on the surface of the inner core box blank, and burning until the flame goes out naturally;

[0046] Step 3, repeat step 2 for 2 times, and then dry the inner core box blank to obtain a fan-shaped inner core box 2 for later use;

[0047] Step 4, uniformly arrange a plurality of cold irons 3 in the fixed outer core box mold, fill the water glass sand i...

Embodiment 2

[0054] A preparation process for butterfly valve body assembly core, the preparation process is:

[0055] Step 1. Evenly set multiple pieces of cold iron 3 in the fixed inner core box mold, fill the inner core box mold with water glass sand and smooth the surface of the water glass sand, and then insert the pipeline with carbon dioxide into the In the mold cavity of the mould, feed carbon dioxide, stop feeding carbon dioxide after 8 minutes, remove the mold, and make the blank of the inner core box;

[0056] Step 2. Apply 1.5mm zircon powder paint on the surface of the inner core box blank, ignite the zircon powder paint on the surface of the inner core box blank, and burn until the flame goes out naturally;

[0057] Step 3, repeat step 2 for 2 times, and then dry the inner core box blank to obtain a fan-shaped inner core box 2 for later use;

[0058] Step 4, uniformly arrange a plurality of cold irons 3 in the fixed outer core box mold, fill the water glass sand in the outer...

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Abstract

The invention discloses a manufacturing process of a core assembly for butterfly valve bodies. The process comprises the following steps of: making inner core boxes and outer core boxes with inner core box dies and outer core box dies, setting a die base, mounting the fan-shaped inner core boxes one by one to form a circular ring-shaped inner core, mounting the fan-shaped outer core boxes one by one to form a circular ring-shaped outer core, and assembling the outer core and the inner core to form a circular ring-shaped core assembly. The manufacturing process is simple and convenient in operation, has a reasonable design, ensures that a molded butterfly valve body has good stability and no cracks on the surface, and improves the sealing effect of a valve to a large extent. The water glass sand used in the invention can be recycled, the equipment used has low prices, the work efficiency is increased, the labor force and the labor time are reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation process of a core assembly, in particular to a preparation process of a butterfly valve body assembly core. Background technique [0002] At present, the butterfly valve body is often used as on-off and flow control components of the pipeline system, mainly used in petroleum, chemical industry, metallurgy, hydropower and other fields, and has been widely used. 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. The butterfly valve body with a diameter greater than 1.8 meters is called a large valve. Body structure, the overall mold is usually used to cast small size butterfly valve body, and there is no specific casting equipment for large butterfly valve body, due to the large diameter of the valve body and flanges at both ends, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10B22D15/00
Inventor 范建超辛金福仝长河杜朝玉付银团张本政
Owner HENAN YUXING CASTING