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Molding sand regeneration method and regenerating system

A regeneration system and molding sand technology, applied in chemical instruments and methods, machinery for cleaning/processing casting materials, casting molding equipment, etc., can solve the problem of low strength of chemical bonding binders, weak magnetism, and castings Calcination defects and other issues

Inactive Publication Date: 2018-06-08
SINTOKOGIO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that if such molding sand is reused as it is, there are problems such as causing firing defects of the casting under the influence of the metal, or reducing the strength of the mold, etc.
If the magnetization is mixed into the mold excessively, it will cause calcination defects in the casting like metal, and in the chemical bonding process, it will also cause the strength of the chemical bonding binder to decrease
However, magnetites are weaker than metals and therefore require higher flux densities for separation

Method used

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  • Molding sand regeneration method and regenerating system
  • Molding sand regeneration method and regenerating system
  • Molding sand regeneration method and regenerating system

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Embodiment Construction

[0038] Next, the best mode for carrying out the present invention will be described.

[0039] First, a method for regenerating molding sand will be described. The method for regenerating mold sand is characterized in that it includes: using the mold sand separated from the casting by shot blasting as an object, using magnetic separation with a first magnetic flux density to remove metal powder and metal flakes, and using the above-mentioned first magnetic flux density Magnetic separation with a higher second magnetic flux density removes magnetized substances; and dry mechanical regeneration removes carbide-containing substances adhering to the surface from the above-mentioned mold sand.

[0040] The above-mentioned substances containing carbides refer to: in the green sand method, carbides containing porous layers called oolitics produced by sintering bentonite and additives such as coal powder or starch, etc. In the knotting process, carbides and reaction products of the bi...

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Abstract

To provide a molding sand regeneration method and regenerating system that effectively separate magnetically adhering material from the molding sand. Provided is a molding sand regeneration method characterized by: removing metal powder and metal fragments by magnetic separation with a first magnetic flux density and removing magnetically adhering material by magnetic separation with a second fluxdensity higher than the first flux density from molding sand S that has been separated from a casting by a shot blast; and removing, from the molding sand, material that includes carbides adhering tothe surface of the molding sand by dry mechanical regeneration.

Description

technical field [0001] The invention relates to a regeneration method and regeneration system of molding sand. Background technique [0002] The mold sand separated from the casting by shot blasting contains a lot of metal particles and metal flakes. It is known that if such molding sand is reused as it is, there are problems such as causing firing defects in castings under the influence of metals, reducing mold strength, and the like. [0003] In Patent Document 1 and Patent Document 2, it is disclosed that the iron of a casting is separated by a magnetic separator. [0004] Patent Document 3 discloses a structure in which magnetic separators are provided before and after two dry-type foundry sand regeneration devices. [0005] Patent Document 4 discloses a regenerative separation system for regenerating and separating chrome sand and silica sand, which are metallic foundry sand, from foundry sand after casting. This regenerative separation system includes: a regenerator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/06B03C1/00B03C1/14B03C1/18B03C1/22B07B4/08B22C5/00B22C5/10
CPCB02C15/04B02C23/14B02C25/00B02C2015/002B03C1/14B03C1/22B03C1/30B03C2201/20B22C5/06B22C5/10Y02P70/10B03C1/18B07B4/08B03C1/08B07B9/00
Inventor 大羽崇文岩崎顺一阿部和也青木达行
Owner SINTOKOGIO LTD
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