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Vacuum seal casting method for wind driven generator ductile iron hub

A technology for vacuum-sealed casting and wind turbines, applied in casting molding equipment, casting molds, casting mold components, etc., can solve problems such as low fatigue strength and surface micro-cracks, improve working conditions, improve environmental protection, and reduce production energy consumption Effect

Inactive Publication Date: 2018-03-30
CHANGZHOU KAIFA GUANGMING CASTING FACTORY GENERAL PARTNERSHIP
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a vacuum-sealed casting method for ductile iron hubs of wind power generators. Wind power castings with high reliability improve the surface quality and dimensional accuracy of castings, and can effectively improve process yield, save energy and reduce consumption, reduce costs, improve working conditions, and are conducive to environmental protection and economic efficiency.

Method used

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  • Vacuum seal casting method for wind driven generator ductile iron hub
  • Vacuum seal casting method for wind driven generator ductile iron hub
  • Vacuum seal casting method for wind driven generator ductile iron hub

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Embodiment

[0017] Shape it with the V method. Vacuum sealing molding (i.e. V method molding) is very different from traditional sand casting methods. It is a physical molding method that combines vacuum technology with sand casting and uses raw sand molding without water and binders. The cavity surface and the back of the sand mold are sealed by plastic film, and the negative pressure is generated by vacuum pump, which causes the pressure difference between the inside and outside of the sand mold to make the sand fasten and form. Press or stop pumping, and the molding sand will collapse to obtain castings. The process of V-method molding includes: manufacturing a template with a suction box and a suction hole; covering the plastic film baked in a plastic state on the template, and vacuum pumping to make the film closely adhere to the template; The sand box of the filter exhaust pipe is placed on the template covered with plastic film; the sand box is filled with dry quartz sand filled w...

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Abstract

The invention provides a vacuum-sealed casting method for a ductile iron hub of a wind power generator, and relates to the technical field of ferrous metal casting. The traditional vacuum-sealed molding (V-method molding) will be used for the molding and casting of ductile iron castings for wind power hubs. Resin sand cores will be used, and the mold cavity will be coated with special solid coatings. The special solid coatings are mainly composed of graphite powder, Composed of quartz powder and zircon powder, the ratio of parts by weight is: graphite powder: quartz powder: zircon powder = 5~7:1:2~5, and the spraying thickness is 0.2~0.6mm. No riser and less cold iron. Solve the problems of low fatigue strength and surface micro-crack defects caused by surface sulfurization of castings in the prior art, and obtain wind power castings with high density that meet the requirements, improve the surface quality and dimensional accuracy of castings, and effectively improve Process yield, energy-saving peak consumption, cost reduction, and improvement of working conditions are conducive to environmental protection and economic efficiency.

Description

technical field [0001] The invention relates to the technical field of ferrous metal casting, in particular to a casting method of ductile iron castings for wind power hubs. Background technique [0002] Casting wind turbine (referred to as wind power) hub castings are generally made of resin sand molding, a large number of cold irons are placed at the hot joints, and insulation risers are placed on the top. The operation is complicated, and because the furan resin curing agent is generally benzenesulfonic acid curing agent, resulting Sulfurization leads to low level of surface spheroidization of castings. Although anti-sulfurization coatings are used as shielding, it cannot completely eliminate the low level of surface spheroidization of castings caused by sulphurization, decreased fatigue strength, large tendency of micro-cracks, and poor quality of castings ; Moreover, due to the thin-skinned and large-core structure of wind power castings, the sand-iron ratio is as high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/28B22C9/03B22C3/00
CPCB22C9/28B22C3/00B22C9/03
Inventor 刘文昭
Owner CHANGZHOU KAIFA GUANGMING CASTING FACTORY GENERAL PARTNERSHIP
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