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Casting technology for high-chromium iron double-suction impeller

A technology of double suction impeller and casting process, applied in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of easy cracking of blades and cover plates, air holes in the shaft head, shrinkage holes in the lower cover plate, etc. The effect of promotion and operation method is simple

Inactive Publication Date: 2014-09-24
薛铁山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-chromium cast iron double-suction impeller casting process, which solves the problem that the high-chromium cast iron double-suction impeller casting produced by the prior art process is easy to crack at the intersection root of the blade and the cover plate, and the shaft head part has air holes. The lower cover has the problem of shrinkage cavity,

Method used

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Examples

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Embodiment Construction

[0011] The present invention is further described through specific examples below, but the invention is not limited to the following examples; a casting process of a high-chromium cast iron double-suction impeller includes the following steps.

[0012] A. Add 2 pull ribs to the cracked part of the blade; in order to effectively feed the lower cover plate, add three side risers, the diameter of the side riser is 160mm, and the height is 400mm. Put the pre-prepared cold iron and chromite sand mixed with sand into the part that needs to be chilled, and then cover the resin sand; when building the upper box, place the gating system and riser according to the process regulations, and ensure that the pouring riser Rinse the root and focus on tightening; after 15 minutes, when the sand mold is hard, turn the box and lift the mold; when making the impeller core, press the cover plate and the core box tightly, place the lifting device, and cover the blade root with chromite sand to ensu...

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Abstract

The invention discloses a casting technology for a high-chromium iron double-suction impeller and belongs to the field of casting. The casting technology is characterized by comprising the following steps that firstly, two pulling ribs are added on a cracked part of a blade, in order to effectively feed a lower cover plate, three side dead heads are added, and the side dead heads are 160 mm in diameter and 400 mm in height; secondly, modeling and core manufacturing are conducted; thirdly, brushing and box combining are conducted; fourthly, smelting and casting are conducted; fifthly, postprocessing of a casting is conducted. According to the high-chromium iron double-suction impeller produced with the technology, the crossed root between the blade of the casting and the cover plate is not cracked, a spindle nose part is not provided with air holes, the lower cover plate is not provided with shrinkage cavities, and the technology is simple in operation and convenient to popularize.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a casting process of a high-chromium cast iron double-suction impeller. Background technique [0002] Since the impeller is used as a flow-passing part, the solution is more corrosive to the impeller. High-chromium cast iron is a good wear-resistant and corrosion-resistant material, but its brittleness is relatively strong. Its casting performance is worse than ordinary high-chromium cast iron, and it is easy to crack. The casting scrap rate is high, and the structure of the double-suction impeller is complicated, and casting is difficult; the castings of the high-chromium cast iron double-suction impeller produced by the current process are prone to cracking at the intersection root of the blade and the cover plate, and there are air holes in the shaft head and the lower cover plate There are shrinkage holes. Contents of the invention [0003] The purpose of the present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/22B22D3/00
Inventor 薛铁山
Owner 薛铁山
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