Cast-iron evaporative pattern coating and preparation method thereof

A technology of lost foam and cast iron, applied in casting molding equipment, coating, mold and other directions, can solve the problems of the decline of the grain size grade of the casting, the influence of the mechanical properties of the casting, the reduction of the gas permeability of the coating, etc. The surface is smooth and the effect of reducing environmental pressure

Active Publication Date: 2017-01-04
桃江新兴管件有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the coating is thickened, the gas permeability of the coating will be reduced, so that the gas generated by the combustion of the pattern cannot be discharged in time before the empty shell is poured, and the combustion of the pattern is not sufficient, resulting in defects such as slag inclusion and local carbon increase in the casting after pouring; In addition, after the coating is thickened, it will also cause the casting to dissipate heat slowly, which will reduce the grain size of the casting and affect t

Method used

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  • Cast-iron evaporative pattern coating and preparation method thereof
  • Cast-iron evaporative pattern coating and preparation method thereof
  • Cast-iron evaporative pattern coating and preparation method thereof

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[0035] Example 1

[0036] 1. Preparation of tools: high-speed mixer, scale, viscosity cup

[0037] 2. Material preparation:

[0038] 320 mesh high alumina powder, perlite, sepiolite, styrene acrylic emulsion, white latex, sodium bentonite, carboxymethyl cellulose, additives

[0039] 3. Operation method:

[0040] 1) The paint ratio is shown in Table 1 below:

[0041]

[0042] Table 1

[0043] Add carboxymethyl cellulose, sodium bentonite, sepiolite into water, stir at high speed for 30 minutes and soak for no less than 12 hours; then add high alumina powder, perlite, styrene acrylic emulsion and white latex into the mixing tank, and Stir at high speed for 1-2 hours; finally add additives and stir for 45 minutes.

[0044] Stir evenly and measure the viscosity (20-25 seconds) before use.

[0045] smear:

[0046] Using rain-drenching method, the model is dipped into the paint, dipped three times, and dried after each dipping before the next dipping.

[0047] Let cool for 3-5 minutes after each d...

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PUM

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Abstract

The invention provides a cast-iron evaporative pattern coating and a preparation method thereof. The cast-iron evaporative pattern coating comprises 84 to 88 parts of high aluminum powder, 8 to 12 parts of perlite, 8 to 12 parts of sepiolite, 6 to 10 parts of styrene-acrylic emulsion, 2 to 3 parts of sodium bentonite, 2 to 5 parts of white latex, 0.1 to 0.4 part of carboxymethylcellulose, 0.2 to 0.6 part of additive, and 105 to 120 parts of water. The coating of the invention has the advantages of uniformity and smoothness and good air permeability, and is easy to overcome the problems that the casting is easy to spray back and the local carbon is deficient, and the strength is high under the high temperature condition, which can eliminate the sticky sand and the collapse of the casting surface.

Description

technical field [0001] The invention belongs to the field of lost foam casting, and in particular relates to a cast iron lost foam coating and a preparation method thereof. Background technique [0002] Lost foam casting is to bond and combine paraffin or foam models similar in size and shape to castings to form model clusters. After brushing refractory paint and drying, they are buried in dry quartz sand for vibration modeling, and poured under negative pressure to vaporize the model. , a new casting method in which liquid metal occupies the position of the model, solidifies and cools to form a casting. At present, the lost foam casting process mostly adopts the direct pouring method, without burning the mold before pouring, and without vibration during pouring, so the requirements for the strength and air permeability of the coating are relatively high. Ordinary lost foam coatings have low strength after painting, and empty shells often collapse during vibratory pouring. ...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 符坚侯永先杨楚谋郑文胜傅力
Owner 桃江新兴管件有限责任公司
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