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Non-chiller ductile iron non-riser casting technology

A casting process and iron ball technology, which is applied in the field of casting without chilled iron ductile iron without risers, can solve the problems of shrinkage cavities, shrinkage porosity defects, waste of production materials, and high production costs, and achieve low shrinkage porosity defect rate and molding. The effect of simple structure and simple casting process

Inactive Publication Date: 2016-07-13
阳泉市煜昌机械制造有限公司
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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 solve the technical problems of existing ductile iron castings, such as serious shrinkage cavity and porosity defects, high reject rate, serious waste of production materials, and high production cost, and provide a casting process for no-chill ductile iron without riser

Method used

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  • Non-chiller ductile iron non-riser casting technology

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Effect test

Embodiment 1

[0018] The no-chill ductile iron no-riser casting technique in the present embodiment, it comprises the following steps:

[0019] 1) Configure molding sand;

[0020] 2), making templates and core box tooling;

[0021] 3) Configure nodular iron raw materials, and carry out molten iron smelting and nodularization and inoculation of molten iron after it is released from the furnace;

[0022] 4), use the configured molding sand to make casting cavity and sand core;

[0023] 5) Set up a pouring system consisting of slag avoidance bag, inner sprue, sprue, and runner, and set core and box together;

[0024] 6), pouring molten iron, and after the casting is formed and cooled, the casting is sanded and cleaned;

[0025] Wherein: the casting cavity is not provided with a riser; the ingate of the ingate uses a flat gate; the interior of the casting cavity is not provided with a cold iron. The ratio of the height to the width of the flat gate is 1:5.25.

[0026] The molding sand desc...

Embodiment 2

[0028] like figure 1 As shown, in the present embodiment, utilize no-chill iron nodular iron no riser casting technology to cast super large automobile hub, it comprises the following steps:

[0029] 1) Configure molding sand;

[0030] 2) According to the process design drawing, make the upper and lower mold templates, core boxes and positioning pins of the casting;

[0031] 3) Configure nodular iron raw materials, and carry out molten iron smelting and nodularization and inoculation of molten iron after it is released from the furnace;

[0032] 4), use the configured molding sand to make casting cavity and sand core:

[0033] (1), use the core box to make sand core;

[0034] (2) Make the lower mold, install the lower sand box on the lower mold template, fill the lower sand box with molding sand and shake it tightly, after the sand filling is completed, the mold will be released when the strength of the molding sand hardens to 5MPa;

[0035] (3) Make the upper mold, instal...

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Abstract

The invention relates to a non-chiller ductile iron non-riser casting technology, which belongs to the technical field of ductile iron non-riser casting, and aims to solve the technical problems that the existing ductile iron castings are serious in shrinkage hole and shrinkage porosity defects, high in rejection rate, serious in waste of means of production, and high in production cost. The non-chiller ductile iron non-riser casting technology comprises the following steps of preparing moulding sand; manufacturing a template and a core box tooling; inoculating molten iron; manufacturing a casting cavity and a sand core; setting a pouring system, setting a core and assembling the mould, wherein the casting cavity is a resinous sand mold, and the moulding sand is prepared from scrubbing silica sand of 30 to 50 meshes and furan resin according to the mass parts of 100: 1.5; the casting cavity is not provided with a riser; an inner pouring gate of an ingate uses a flat pouring gate; no chiller is arranged inside the casting cavity. The non-chiller ductile iron non-riser casting technology fully utilizes self-feeding ability of ductile iron, and has the advantages of simple shape and structure, low ductile iron casting shrinkage hole and shrinkage porosity defects, simple casting process, strong operability, and capability of being applied to casting large ductile iron castings.

Description

technical field [0001] The invention belongs to the technical field of no-riser casting of ductile iron, and in particular relates to a no-riser casting process of no-chill ductile iron. Background technique [0002] Shrinkage cavity and shrinkage porosity are common casting defects of ductile iron castings. The existing methods to solve the casting defects of ductile iron are: on the one hand, use cold iron to control the solidification speed of ductile iron and set the solidification mode of ductile iron; on the other hand, set Riser, using the ductile iron in the riser to feed the casting. However, due to the special solidification method of ductile iron, the solidification method is porridge-like solidification, and the method of feeder feeding cannot produce a satisfactory feeding effect, and even the phenomenon of "backward pumping" occurs, resulting in shrinkage cavity of ductile iron castings , Shrinkage defects are serious, the scrap rate is high, the production ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/08B22C1/22
CPCB22C9/02B22C1/224B22C9/08
Inventor 马成敏邓先康
Owner 阳泉市煜昌机械制造有限公司
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