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Method for preparing formwork reinforcement layer slurry and formwork treatment method

A reinforcement layer and mold shell technology, which is applied in the field of investment precision casting, can solve problems such as cracks, large internal stress of castings, poor mold shell yield, etc., and achieve the effects of reducing external incentives, high bonding strength, and enhancing collapsibility

Active Publication Date: 2016-09-14
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: although it can cast qualified and complex aluminum alloy castings, due to the large difference in specific gravity, shrinkage rate, material hardness, etc. Poor performance, resulting in large internal stress of castings, resulting in a large number of cracks in complex castings of complex aluminum alloys, resulting in a large number of scrapped castings, resulting in increased production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of slurry for adding formwork shell collapsibility reinforcement layer for turbine blades:

[0022] 1. Binder ratio:

[0023] The binder is composed of a mixture of latex (GB18583-2001, BT-091B (model)), alcohol, and ethyl silicate hydrolyzate. Add 3.26kg of latex and 5000ml of alcohol to 20kg of ethyl silicate hydrolyzate.

[0024] 2. Preparation of refractory coating:

[0025] 2.1 The temperature in the operating room is 18°C ​​and the humidity is 45%;

[0026] 2.2 Preparation of binder: put the weighed latex into a clean stainless steel container, add a thin stream of alcohol into the latex while stirring with a mixer, and stir for 60 minutes until the latex becomes transparent;

[0027] 2.3 Pour the stirred latex solution into the ethyl silicate hydrolyzate, and stir with a mixer for 40 minutes to reach a uniform state;

[0028] 3. Preparation of slurry:

[0029] 3.1 The ratio of the slurry: add 2.5kg of refractory powder to each liter of ...

Embodiment 2

[0039] The preparation method of adding the collapsible reinforcement layer of the formwork to the lubricating oil return pipe:

[0040] 1. Binder ratio:

[0041] The binder is composed of a mixture of latex (GB18583-2001, BT-091B (model)), alcohol, and ethyl silicate hydrolyzate. Add 3.26kg of latex and 5000ml of alcohol to 20kg of ethyl silicate hydrolyzate.

[0042] 2. Preparation of refractory coating:

[0043] 2.1 The temperature in the operating room is 20°C and the humidity is 50%;

[0044] 2.2 Preparation of binder: put the weighed latex into a clean stainless steel container, add a thin stream of alcohol into the latex while stirring with a mixer, and stir for 75 minutes until the latex becomes transparent;

[0045] 2.3 Pour the stirred latex solution into the ethyl silicate hydrolyzate, and stir with a mixer for 50 minutes to reach a uniform state;

[0046] 3. Preparation of slurry:

[0047] 3.1 The ratio of the slurry: add 2.6kg of refractory powder to each lite...

Embodiment 3

[0057] The preparation method of adding the collapsible reinforcement layer of the formwork to the oil collecting tank:

[0058] 1. Binder ratio:

[0059] The binder is composed of a mixture of latex (GB18583-2001, BT-091B (model)), alcohol, and ethyl silicate hydrolyzate. Add 3.26kg of latex and 5000ml of alcohol to 20kg of ethyl silicate hydrolyzate.

[0060] 2. Preparation of refractory coating:

[0061] 2.1 The temperature in the operating room is 24°C and the humidity is 55%;

[0062] 2.2 Preparation of binder: put the weighed latex into a clean stainless steel container, add a thin stream of alcohol into the latex while stirring with a mixer, and stir for 90 minutes until the latex becomes transparent;

[0063] 2.3 Pour the stirred latex solution into the ethyl silicate hydrolyzate, and stir with a mixer for 60 minutes to reach a uniform state;

[0064] 3. Preparation of slurry:

[0065] 3.1 The ratio of the slurry: add 2.7kg of refractory powder to each liter of bin...

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Abstract

The invention provides a shuttering reinforcing layer slurry preparation method and a shuttering processing method. A binder of a reinforcing layer slurry is composed of latex, alcohol and a ethyl silicate hydrolysate mixture. A shuttering generates creep deformation under the high-temperature effect of a fused poured molten metal and enables the bonding strength to be reduced, therefore a broken bond is generated in a Si-O bond network in the shuttering body, and the collapsibility of the shuttering is enhanced. In a solidifying contraction process of a casting, the shuttering is easily collapsed, the obstruction force acting on the casting is reduced, and thus the external inducement leading to casting cracks of the aluminium alloy casting is reduced, and the deformability and the collapsibility of the shuttering in the fusing pouring process are increased, thereby preventing the phenomenon that because the shuttering deformability is bad and casting shrinkage is prevented, hot cracks are generated in the fusing pouring process of the casting.

Description

technical field [0001] The invention belongs to the technical field of investment precision casting, and in particular relates to a method for preparing slurry for a reinforcement layer of a mold shell and a method for treating the mold shell. Background technique [0002] The complex structure of the lubricating oil pump seat of the aero-engine is formed by precision investment casting, and the alloy material is ZL105. The investment casting of aluminum alloy generally adopts the shell making process of investment casting of superalloy and reinforcement layer. The preparation method of the existing reinforcement layer coating is: add 2.5Kg~2.7Kg of refractory material in every liter of binder; the binder is ethyl silicate hydrolyzate (main technical standard: SiO 2 =19%~21%, HCl=0.20%~0.35%, it can be used after 24 hours after hydrolysis); the refractory material is Shangdian powder (particle size 270 mesh). Its disadvantages are: although it can cast qualified and comple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C1/20
CPCB22C1/20B22C9/04
Inventor 彭颖张军刘晓飞胡颖涛解洪超鹿朋涛
Owner AECC AVIATION POWER CO LTD
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