Ceramic secondary reinforcement method

A technology of ceramic core and secondary strengthening, which is applied in the direction of core, mold, and mold composition, which can solve problems such as broken cores and cannot fully meet production requirements, so as to improve the pass rate of castings and reduce broken cores Defects, the effect of simple operation process

Inactive Publication Date: 2014-10-22
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the ceramic core of large blades, the method cannot fully meet the production requirements, and the problem of broken cores still often occurs

Method used

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  • Ceramic secondary reinforcement method

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Take the second-stage guide vane of a machine as an example. The implementation process is as follows: ceramic core secondary strengthening method, this method includes the following steps:

[0015] In the first step, the dewaxed mold shell with the ceramic core is subjected to secondary baking. The baking process is as follows: the temperature is raised from room temperature to 900 °C at a rate of 4 °C per minute, kept for 1 hour, and then heated at a temperature of 3 °C per minute. The heating rate is raised from 900°C to 1200°C, kept for 3 hours, and finally cooled to below 200°C with the furnace.

[0016] The second step is to perform secondary strengthening on the mold shell with ceramic core after the second firing. The strengthening process is as follows: Slowly pour the ethyl silicate hydrolyzate from the sprue cup of the mold shell into the baked mold shell After soaking for 20 minutes, pour out the ethyl silicate hydrolyzate until it is submerged to the sprue...

Embodiment 2

[0018] Take the first-stage guide vane of a machine as an example. The implementation process is as follows:

[0019] A secondary strengthening method for a ceramic core, the method comprising the following steps:

[0020] In the first step, the dewaxed mold shell with the ceramic core is subjected to secondary baking. The baking process is as follows: the temperature is raised from room temperature to 900 ° C at a heating rate of 4.5 ° C per minute, kept for 1.5 hours, and then heated at 3.5 ° C per minute. The heating rate is raised from 900°C to 1200°C, kept for 3.5 hours, and finally cooled to below 200°C with the furnace.

[0021] The second step is to perform secondary strengthening on the mold shell with ceramic core after the second firing. The strengthening process is as follows: Slowly pour the ethyl silicate hydrolyzate from the sprue cup of the mold shell into the baked mold shell After soaking for 30 minutes, pour out the ethyl silicate hydrolyzate until it is s...

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Abstract

The invention relates to the field of precise casting of fusible patterns, and especially relates to a solution scheme of core breakage and leakage defects caused by insufficient ceramic core strength. A ceramic core secondary reinforcement method comprises the following steps: 1, secondary roasting of a de-waxed die shell with a ceramic core: heating from normal temperature to 900DEG C under a heating rate of 4-5DEG C/min, carrying out heat insulation for 1-2h, heating from 900DEG C to 1200DEG C under a heating rate of 3-4DEG C/min, carrying out heat insulation for 3-4h, cooling with a furnace to below 200DEG C, and discharging the obtained die shell from the furnace; and 2, secondary reinforcement on the secondary-roasted die shell with the ceramic: slowly dumping an ethyl silicate hydrolysate into the roasted die shell from the sprue cup of the die shell until the level of the ethyl silicate hydrolysate reaches the sprue cup, immersing for 20-40min, dumping out the ethyl silicate hydrolysate, naturally drying, and chemically hardening to obtain a die shell to be cast.

Description

technical field [0001] The invention relates to the field of investment precision casting, in particular to a solution to the defect of broken and leaky cores caused by insufficient strength of ceramic cores. Background technique [0002] The strength of the ceramic core is the main factor affecting the performance of the ceramic core. In order to make the ceramic core withstand various external forces such as the impact and pressure of the wax material, the impact and pressure of the molten metal, etc. during the process of pressing the wax mold, dewaxing, shell baking and pouring, the ceramic core needs to be strengthened. , The traditional ceramic core high and low temperature strengthening process has a good effect on solving the problems of broken and leaky cores of small ceramic cores. But for the ceramic core of large-scale blade, use its method and can not satisfy production requirement fully, broken core problem still often occurs. Especially in the production of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/12
Inventor 海潮陈波俞州董茵郭永华刘丽亚刘玉柱郑元斌
Owner AECC AVIATION POWER CO LTD
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