Shell casting method through contraction and then gasification of high-performance coating foam and mold sample of evanescent mode

A lost foam, high-performance technology, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of carbon increase and uneven composition, and achieve the effect of low cost and simple process

Inactive Publication Date: 2012-09-19
刘翔 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The outstanding disadvantages of lost foam casting with foam Xu at home and abroad are that carbon in EPS accounts for 92% of the molecular weight, and carbon...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for casting a casting with a casting weight of 100kg of small and medium-sized steel castings with high-performance paint foam and a mold that shrinks first and then gasifies an empty shell, comprising the following steps:

[0028] (1) Manufacture pattern: the manufacture of EPS foam pattern is an existing technology;

[0029] (2) Preparation of paint: The paint is divided into two types: inner layer and outer layer. The inner layer is 2 layers, which is prepared for 200 mesh refractory aggregate, and the outer layer is 2 layers, which are 100 mesh and 200 mesh. refractory aggregate;

[0030] (3) Coating: 2 times of dip coating or shower coating on the inner layer, 2 times of dip coating or shower coating on the outer layer, the total thickness of the inner layer > 0.6mm, and the total thickness of the outer layer > 2mm;

[0031] (4) Coating drying: drying layer by layer, drying room temperature 50-55 ℃;

[0032] (5) Reduction shrinkage: After the paint dries...

Embodiment 2

[0045] Carry out according to the method step of embodiment 1, difference is: the casting that pours is cast iron, piece weighs 380kg medium and large piece, inner layer coating thickness > 0.6mm, outer layer > 2.0mm, coating layer total thickness is 3.1mm , gasified into a carbon-free hollow shell mold and cooled to below 100 ° C, then boxed to imitate investment casting. Conventionally, sand is filled in a sand box with a negative pressure device (sand filling without vibration), and then sealed according to the conventional lost foam molding method. Seal the mold with a plastic film, and implement a negative pressure of -0.025MPa to prevent the shell from bursting when the molten iron is poured.

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Abstract

The invention discloses a shell casting method through contraction and then gasification of high-performance coating foam and a mold sample of an evanescent mode. The method comprises the following steps of: manufacturing the mold sample; preparing an inner-layer coating and an outer-layer coating; spreading the coatings; drying the coatings; performing reduction and contraction; performing gasification and evanescence; and packing and casting, wherein the inner-layer coating is prepared by mixing and stirring an additive special for a Guilin No. 5 evanescent mode coating, refractory aggregate powder with 180-220 meshes and water; and the outer-layer coating is prepared by mixing and stirring an additive special for a Guilin No. 5 evanescent mode coating, refractory aggregate powder with thickness being 70-100 meshes and180-220 meshes in half and water; According to the method, the mold sample has sufficient strength, dimensional accuracy and surface smoothness; carbon defects such as recarburization, slag inclusion, air holes, cockles and carbon black caused by the foam mold sample can be eliminated; the method is applicable in casting the evanescent mode with any steel; the situation that 5-10 layers of coatings are coated, and 5-10 layers of dry sand are spread when in investment casting does not needed; roasting at the temperature of 1000 DEG C in a kiln is unnecessary; and the process is simple, has low cost, and has energy conservation and emission reduction.

Description

technical field [0001] The invention relates to lost-foam casting, in particular to a lost-foam casting method in which foam patterns of high-performance coatings shrink first and then gasify into empty shells. Background technique [0002] The outstanding disadvantages of lost foam casting with foam Xu at home and abroad are that carbon in EPS accounts for 92% of the molecular weight, and carbon slag, pores, wrinkled skin, carburization, and uneven composition will inevitably be produced under the action of high-temperature molten metal. Severe carbon deficiency. In order to eliminate the various defects caused by the carbon in the foam pattern, the most realistic and effective method is to first burn the foam in the mold into an empty shell (that is, the foam pattern disappears), and then pour the molten metal. This empty-shell carbon-free lost foam casting method provides a reliable and practical technical guarantee for the production of low-carbon steel, low-alloy steel...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C7/02
Inventor 刘翔刘玉满
Owner 刘翔
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