Coated sand shell mould and steel-coated sand solidification casting process

A technology of casting technology and coated sand, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc. Resistance to casting defects, low production cost and good applicability

Inactive Publication Date: 2017-06-09
山东汇金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sand-covered iron mold has poor air permeability, can only be molded for one mold, has a large investment, occupies a large area, has a long r

Method used

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  • Coated sand shell mould and steel-coated sand solidification casting process
  • Coated sand shell mould and steel-coated sand solidification casting process
  • Coated sand shell mould and steel-coated sand solidification casting process

Examples

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Embodiment 1

[0025] The inventor took a production method of a bearing adjuster casting as an example to specifically illustrate the beneficial effects of the casting process of adopting a coated sand shell mold and steel-coated sand solidification.

[0026] The material of the casting is D5506, the tensile strength Rm≥550MPa of the body sampling, the elongation A≥6%; the hardness is 217-255HB. Compared with SAE J434 standard material D5506 (Rm≥552MPa, A≥6%; hardness 187-255HB): the minimum hardness has increased by about 16%. According to the relationship between the hardness and tensile strength of ductile iron and the inventor's production experience, the The research on the casting needs to meet the following requirements: body Rm≥650MPa, A≥6%. Since the hardness range is narrowed from 68HB to 38HB, the cooling process of the casting needs to be effectively and stably controlled. Since the sampling of the body is affected by the structure of the casting, the degree of non-homogeneity ...

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Abstract

The invention belongs to the field of casting and particularly relates to a coated sand shell mould and steel-coated sand solidification casting process. The casting process includes molding material preparation, molding, core making, metal smelting, pouring, solidification control and other technologies. The invention aims to make innovation on the aspects of molding and solidification control so that a casting can be superior to a casting tissue produced regularly. The casting process is characterized in that two types of materials are adopted for a molding process for compound molding, the two types of materials comprise surface sand and floor sand, and the surface sand and the floor sand are of different heat conductivity coefficients. Coated sand is selected as the surface sand, the consumption of the coated sand is reduced, and casting surface quality is improved; steel sand is adopted for the floor sand, the used sand regeneration cost is lowered, more importantly, the steel sand is served as conformal indirect cold iron, the casting modulus is lowered, and casting defects are reduced; and the two molding materials of different heat conductivity coefficients are matched, and the cooling speed is controlled to obtain the uniform casting tissue. The process is high in production flexibility, good in applicability and low in cost.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a casting process for solidifying steel sand-coated sand shell molds. Background technique [0002] Casting technology is the technology and method of producing castings by applying casting related theory and systematic knowledge. Including molding material preparation, molding, core making, metal melting, pouring and solidification control, etc. The performance of a casting depends on its internal structure. The structure of a casting is determined by the casting process. Obtaining a predetermined structure through the control of the solidification process of the casting is a key link in the production of the casting. For castings with a certain chemical composition and structural shape, the cooling capacity of the mold is a key factor for solidification control to obtain a predetermined structure. Different mold materials have different thermal conductivity, resulting in di...

Claims

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Application Information

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IPC IPC(8): B22C9/02B22C1/00
CPCB22C9/02B22C1/00
Inventor 孔庆柱李光民刘清良许文青吕海峰
Owner 山东汇金股份有限公司
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