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Chill coating for casting

A cold iron coating and casting technology, applied in the direction of coating, casting mold, casting mold composition, etc., can solve the problems of inconspicuous effect, increase of casting production cost, difficult to eliminate, etc., to reduce cost, improve casting yield, avoid white mouth effect

Inactive Publication Date: 2012-02-22
李华山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the effect is not obvious, especially the white spots on the cold iron parts, which are not easy to eliminate, and can only be eliminated by heat treatment, which increases the production cost of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: this chilled iron coating is made up of following material by weight percentage: graphite powder 88.5%, sodium bentonite 3%, iron oxide red powder 2.5%, ferrosilicon powder 2.5%, rosin 3.5%, ethanol amount; Shaped graphite powder and flaky graphite powder are used in combination, and the percentage by weight is: 30% of flaky graphite powder and 70% of amorphous graphite powder.

[0008] The configuration method of the coating: 1. Grind the rosin and pass through a 200 / 270 sieve; 2. Dissolve the rosin in ethanol, add bentonite and stir, then add scaly graphite powder, amorphous graphite powder, iron oxide red powder, silicon Iron powder, stir evenly for use. When using, brush evenly on the cold iron work surface with a row of brushes, with a thickness of about 0.1-0.3mm, and then ignite and bake.

Embodiment 2

[0009] Embodiment 2: this cold iron coating is made up of following material by weight percentage: graphite powder 89%, sodium bentonite 2%, iron oxide red powder 3%, ferrosilicon powder 3%, rosin 3%, ethanol amount; Amorphous graphite powder The ratio of flake graphite powder is 25:75.

Embodiment 3

[0010] Embodiment 3: this cold iron coating is made up of following material by weight percentage: graphite powder 88%, sodium bentonite 4%, iron oxide red powder 2%, ferrosilicon powder 2%, rosin 4%, ethanol amount; Amorphous graphite powder The ratio with flake graphite powder is 35:65.

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PUM

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Abstract

The invention discloses a chill coating for casting, which is composed of graphite powder, sodium bentonite, iron oxide red, silicon iron powder, colophony and ethyl alcohol. Amorphous graphite powder is combined with flaky-shaped graphite powder in usage. The chill coating for the casting can effectively prevent chill from appearing at chill portions and improve casting quality.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a cold iron coating for castings. Background technique [0002] In the production of nodular cast iron, in order to change the solidification mode of castings and ensure that there are no shrinkage porosity and shrinkage cavities inside the castings, a certain amount of chilled iron is often placed to solve the quality problems of shrinkage porosity and shrinkage cavities, but there is another outstanding The quality problems of cold iron castings appear white, difficult to process, and accompanied by porosity. In production, traditional cold iron paint is used, such as: 1. Rosin 25%, soot black 15%, system oil 60%; 2. Graphite powder 94%, clay 6%, water amount. But the effect is not obvious, especially the white spots on the cold iron parts, which are not easy to eliminate, and can only be eliminated by heat treatment, which increases the production cost of castings...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 周长华徐道义孙启林郭传静
Owner 李华山
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