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New method for manufacturing composite coating shell for precisely casting fusible patterns

A composite coating and precision casting technology, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of poor product quality, long production cycle, low product precision, etc., and achieve high quality and high refractoriness , the effect of high dimensional accuracy

Inactive Publication Date: 2010-02-10
武汉工控艺术制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new method for making composite coating shells for investment casting investment molds, which solves the problems of low product precision, long production cycle, and product quality problems in the production of investment coating shells in the investment casting industry for a long time. Poor problems, in order to comprehensively improve the product quality of precision castings, improve production efficiency, reduce production costs, and promote the progress and development of investment casting production technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] Example 1. Making composite coating shells for investment precision casting and pouring bronze handicrafts.

[0034] (1) Preparation of water-based ethyl silicate-silica sol mixed binder coating

[0035] 1) Preparation of water-based ethyl silicate binder mother liquor

[0036] Take 50ml of ethyl silicate, use 200g of 320 mesh silica powder refractory powder as dispersed coal, add 4ml of 1:1 hydrochloric acid aqueous solution prepared by 2ml of hydrochloric acid and 2ml of water under stirring, speed up the mixing, and the mixture changes instantaneously. Dry, then become thinner and accompanied by heat, and soon become a viscous slurry. At this time, the ethyl silicate has been fully hydrolyzed to make a water-based ethyl silicate binder mother liquor.

[0037] 2) Preparation of water-based ethyl silicate binder:

[0038] Take 1000ml of ethyl silicate and 100ml of water, first add most of the ethyl silicate to the above mother liquor and stir evenly, then add water a...

example 2

[0056] Example 2. Fabrication of cast low-alloy steel investment composite coating shell for precision casting

[0057] (1) Preparation of water-based ethyl silicate-silica sol mixed binder coating

[0058] 1) Preparation of water-based ethyl silicate mother liquor

[0059] Same example 1.

[0060] 2) Preparation of water-based ethyl silicate binder

[0061] Same example 1.

[0062] 3) Preparation of water-based ethyl silicate-silica sol mixed binder

[0063] Get as above-mentioned step 2) 1154ml water-based ethyl silicate binding agent of preparation, by following weight percentage:

[0064] Water based ethyl silicate binder 30%

[0065] Silica sol 60%

[0066] Absolute Alcohol 7%

[0067] water 3%

[0068] Hydrochloric acid 0.05% by volume

[0069] Immediately add 2308ml of silica sol, 269ml of absolute alcohol, 115ml of water, and 1.92ml of hydrochloric acid, and stir evenly to prepare a water-based ethyl silicate-silica sol mixed binder.

[0070] 4) Preparation o...

example 3

[0079] Example 3. Making precision casting pouring stainless steel investment composite coating shell

[0080] (1) Preparation of water-based ethyl silicate-silica sol mixed binder coating

[0081] 1) Preparation of water-based ethyl silicate mother liquor

[0082] Same example 1.

[0083] 2) Preparation of water-based ethyl silicate binder

[0084] Same example 1.

[0085] 3) Preparation of water-based ethyl silicate-silica sol mixed binder

[0086] Get as above-mentioned step 2) 1154ml water-based ethyl silicate binding agent of preparation, by following weight percentage:

[0087] Water based ethyl silicate binder 35%

[0088] Silica Sol 55%

[0089] Absolute Alcohol 7%

[0090] water 3%

[0091] Hydrochloric acid 0.03% by volume

[0092] Immediately add 1813ml of silica sol, 230ml of absolute alcohol, 99ml of water, and 0.99ml of hydrochloric acid, and stir evenly to prepare a water-based ethyl silicate-silica sol mixed binder.

[0093] 4) Preparation of water-ba...

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PUM

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Abstract

The invention relates to a new method for manufacturing a composite coating shell for precisely casting fusible patterns, and belongs to the field of precise casting. The method comprises the following steps: using water-based ethylsilicate-silica sol as a mixed binder, preparing mixed binder paint by mixing the mixed binder with refractory powders and a curing agent, painting the mixed binder paint on the surface of a fusible pattern to form a monolayer or multilayer coating bottom layer, and sequentially painting a monolayer water glass binder paint transition coating and a multilayer waterglass binder paint enhanced coating on the bottom layer, thereby forming the composite coating shell for precisely casting the fusible pattern, wherein the composite coating shell consists of a mixedbinder coating bottom layer and a water glass binder coating enhanced skin coat. The invention solves the manufacturing difficult points of the shells with complicated inner cavities, deep blind holesand deep groove parts and the problems of slow drying, long production periods, low quality and the like of the shells existing in a precise casting trade for a long time, comprehensively improves the quality of precision castings, markedly reduces the production cost, is favorable for environment protection and is a creative breakthrough for a traditional technique in the field.

Description

Technical field: [0001] The invention discloses a new method for making a composite coating mold shell for precision casting investment molds, belonging to the technical field of precision casting. technical background: [0002] At present, there are mainly three kinds of investment casting precision casting shell manufacturing processes at home and abroad: ①Sodium silicate coating fusion casting shell precision casting process, ②Ethyl silicate coating fusion casting shell precision casting process, ③Silicon sol coating melting shell casting process, Model shell precision casting process, the binders used in the above three melting mold shell coatings in precision casting are a single water glass, ethyl silicate, and silica sol. These three binders have certain limitations in production and application. Problem: The existing ethyl silicate shell process is cumbersome and the production cost is high; the silica sol shell is difficult to produce for parts with complex inner ca...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C1/16
Inventor 胡本炎
Owner 武汉工控艺术制造有限公司
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