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Method for forming large-section nodular cast iron shielding hemispherical casting

A technology of nodular cast iron with large cross-section, which is applied in the field of cast iron casting. It can solve the problem that the normal 16 sectional area of ​​the spherical surface cannot be exceeded, and achieve the effects of strong anti-spheroidal recession, improved apparent quality, and prolonged solidification time.

Active Publication Date: 2021-07-16
SHANNXI DIESEL ENGINE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1) For the detected shrinkage and other hole defects, the cross-sectional area of ​​the defects in the normal direction of the spherical surface cannot exceed 22.5mm 2 ;

Method used

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  • Method for forming large-section nodular cast iron shielding hemispherical casting
  • Method for forming large-section nodular cast iron shielding hemispherical casting
  • Method for forming large-section nodular cast iron shielding hemispherical casting

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Embodiment Construction

[0088] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0089] It should be noted that, in this document, the terms "comprising", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or apparatus. without further restrictions. An element defined by the phrase...

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Abstract

The invention belongs to the technical field of cast iron casting, and provides a method for forming a large-section nodular cast iron shielding hemisphere casting. The method comprises the following steps of performing low-temperature, rapid and stable mold filling on molten iron by selecting a bottom pouring, filtering and open pouring system, and forming the nodular cast iron shielding hemisphere casting by adopting high-carbon low-silicon, heavy rare earth nodulizing and multi-stage inoculation strengthening. The requirements of part forming technical files are effectively met, and the quality problems of shrinkage porosity, shrinkage cavity, slag inclusion, inclusion, graphite floating, air holes and the like are not found.

Description

technical field [0001] The invention belongs to the technical field of cast iron casting, and in particular relates to a method for forming a large-section ductile iron shielding hemispherical casting. Background technique [0002] The shielding hemisphere is the most important part of MRI medical imaging equipment. The material is QT400-15A, the outer diameter of the hemisphere is SR887.5mm, the inner diameter of the hemisphere is SR429mm, the minimum inner diameter is φ480mm, the height is 865mm, the blank wall thickness is about 458.5mm, and the part weight is 7050Kg. The casting weight is 8750Kg, and the pouring weight is 10.5 tons. Parts diagram as figure 1 The shielding hemispherical structure. The tensile strength of the casting attached to the casting sample is 370, the yield strength is 240, the elongation is 11, the Brinell hardness is 120-180, and the metallographic structure is in accordance with "GB / T9441-2009 Metallographic Structure Inspection of Nodular Cas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/22B22C9/08B22D15/00B22D31/00B22D46/00C21C1/10C21D5/00C21D9/00C22C33/08C22C37/04C22C37/10
CPCB22C9/02B22C9/22B22C9/082B22C9/086B22C9/088B22D15/00C22C37/10C22C37/04B22D31/002C21D9/0068C21D5/00B22D46/00C21C1/10C21C1/105C22C33/08Y02P10/20
Inventor 晁革新
Owner SHANNXI DIESEL ENGINE HEAVY IND
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