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Machining method of cast-state nodular cast iron well lid

A technology of ductile cast iron and processing methods, applied in the direction of metal processing equipment, casting molds, casting mold components, etc., to achieve the effects of preventing shrinkage and cracks, improving friction conditions, and preventing cold shut

Inactive Publication Date: 2018-11-20
安徽大来机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cold shut phenomenon is a common defect in the foundry industry, the research on the specific product of ductile iron manhole cover is still of great practical significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A processing method for a cast ductile iron manhole cover is characterized in that it is made by the following steps:

[0014] 1) Clay sand with a compactness of 80 and water-based graphite paint are used for modeling, and a closed pouring system is used for pouring. The ratio of sprue: horizontal sprue: inner sprue is 1.25:2:1. A sprue cup is provided, the cross runner adopts a semi-circular shape, and a slag collecting bag is set, four inner runners are opened vertically in the shape of a trumpet, and a gas riser is left at the last filling part of the molten iron;

[0015] 2) Select molten iron with a carbon content of 3.9%, add 2.4% silicon and 0.3% manganese, and heat it to 1500°C in a high-temperature forging furnace;

[0016] 3) Preheat the spheroidizing agent alloy, cover 13% of 75SiFe particles with a particle size of 10 mm and 2.5% NaHCO3, compact and keep warm;

[0017] 4) Spheroidizing treatment in front of the furnace, using the dam-type ladle bottom flush...

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Abstract

The invention discloses a machining method of a cast-state nodular cast iron well lid. The machining method is characterized by the cold barrier is prevented through adjusting a pouring system, improving the friction conditions and reducing the flowing resistance; and the inoculation is strengthened through controlling the discharge temperature of molten iron and purifying the molten iron. The product quality and the yield of the nodular cast iron well lid are improved; and the cost is reduced.

Description

technical field [0001] The invention relates to the processing field of nodular cast iron manhole covers, and mainly relates to a processing method of as-cast nodular cast iron manhole covers. Background technique [0002] The demand for ductile iron manhole covers in the domestic and international markets is increasing day by day, and the market competition is also becoming increasingly fierce. This requires products to be diversified in terms of varieties and functions, and requires light weight, high strength, good surface quality, and long service life. long. In the design of the manhole cover, its epidermis and wall thickness are designed to be thinner and thinner, which provides a greater possibility for the occurrence of cold shut defects. Practice has shown that cold insulation is the first major defect in the production of ductile iron manhole covers. Due to the thin wall thickness and large size range of the two ductile iron manhole covers, the ductile iron has m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/08C21C1/10C22C33/08C22C37/04C22C37/10B22C9/02
CPCB22C3/00B22C9/02B22C9/082C21C1/10C22C33/08C22C37/04C22C37/10
Inventor 何方杰
Owner 安徽大来机械制造有限公司
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