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Cast exudation of investment casting mould

A technology of lost foam casting and lost foam casting, which is applied in the directions of casting molds, casting mold components, and manufacturing tools, etc., can solve the problem that the surface of the casting infiltration layer is prone to pores, slag inclusion, and difficult to stabilize and high-quality casting infiltration surface and surface quality. Instability and other problems, to achieve the effect of smooth and smooth surface composite layer, increase thickness, and ensure smoothness

Inactive Publication Date: 2006-08-16
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the participation of many physical and chemical reactions in the formation process, the formation mechanism is very complicated, and the control of the process is difficult, so there are still many technical problems in the application process. The most prominent problem is: the surface of the cast infiltration layer is easy to There are many defects such as pores and slag inclusions; the surface quality is unstable and it is not easy to obtain a high-quality casting surface
So far, there have been no mature application reports on the use of lost foam technology in casting infiltration technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The specific process of this embodiment is as follows: first make the lost foam model and reserve the coating position of the infiltration agent on the mold of the lost foam model, apply the infiltration agent on the reserved part of the foam model, and then paint on it. The special lost foam refractory coating is then dried in an oven. The refractory coating is a commonly used water-based coating (available in the market), and the thickness of the coating is 0.4mm. Then assemble the model coated with refractory paint into a model bundle, place the pouring riser, put it into the sand box, fill it with dry sand, and vibrate on the three-dimensional vibrating table to make the sand mold compact. Put the compact sand box with built-in foam model on the pouring station, cover the surface with plastic film, and turn on the vacuum pump to increase the vacuum degree by 0.002MPa on the basis of the usual 0.045-0.055MPa. Pour the melted molten metal into the mold, and the pourin...

Embodiment 2

[0022] The specific process of this embodiment is as follows: first make the lost foam model and reserve the coating position of the infiltration agent on the mold of the lost foam model, apply the infiltration agent on the reserved part of the foam model, and then paint on it. The special lost foam refractory coating is then dried in an oven. The refractory coating is a commonly used water-based coating (available in the market), and the thickness of the coating is 0.6mm. Then assemble the painted model into a model bundle, place the pouring riser, put it into the sand box, fill it with dry sand, and vibrate on the three-dimensional vibrating table to make the sand mold compact. Put the compact sand box with built-in foam model on the pouring station, cover the surface with plastic film, and turn on the vacuum pump to increase the vacuum degree by 0.004MPa on the basis of the usual 0.045-0.055MPa. Pour the melted molten metal into the mold, and the pouring temperature is 50°C...

Embodiment 3

[0025] The specific process of this embodiment is as follows: first make the lost foam foam model and reserve the coating position of the infiltration agent on the mold of the lost foam model, apply the infiltration agent on the reserved part of the foam model, and then paint on it. The special lost foam refractory coating is then dried in an oven. The refractory coating is a commonly used water-based coating (available in the market), and the thickness of the coating is 0.7mm. Then assemble the painted model into a model bundle, place the pouring riser, put it into the sand box, fill it with dry sand, and vibrate on the three-dimensional vibrating table to make the sand mold compact. Put the compact sand box with built-in foam model on the pouring station, cover the surface with plastic film, and turn on the vacuum pump to make the vacuum degree reach 0.058MPa. Pour the molten metal into the mold, and the pouring temperature is 80°C higher than the pouring temperature of iron...

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Abstract

A casting-penetrating technology with consumable mould for making the cast workpiece have an antiwear and anticorrosion surface layer includes such steps as coating the casting penetrant on the surface of consumable foam mould, coating special refractory paint, baking and casting at the temp which is 30-80 deg.C higher than ordinary casting temp and under the vacuum degree which is 0.002-0.006 MPa higher than ordinary vacuum degree.

Description

Technical field [0001] The invention belongs to the technical field of casting infiltration technology, and mainly relates to a lost foam casting infiltration technology. Background technique [0002] Casting infiltration technology is a surface strengthening technology formed by combining chemical heat treatment, coating and other surface strengthening technologies with casting technology. It is to pre-coat the casting infiltration agent on the inner surface of the sand mold made by using the high temperature of the molten metal during pouring. The infiltration agent is partially melted to form a composite layer with special structure and properties on the surface of the casting, so that the surface of the casting has the advantages of wear resistance, heat resistance, and corrosion resistance. Compared with other surface strengthening technologies (chemical heat treatment, laser surfacing, plasma spraying, etc.), it has the characteristics of no special equipment, thick co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/08B22C9/04
Inventor 陈跃张永振上官宝铁喜顺孙乐民杜三明邱明
Owner HENAN UNIV OF SCI & TECH
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