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Hollow ceramic core stuffing method for expendable pattern precision casting

A technology of investment precision casting and hollow ceramics, which is applied in the field of hollow ceramic core filling and hollow ceramic core filling, can solve problems such as metallurgical defect risks, achieve excellent process stability, reduce loose tendency of castings, and reduce local Effect of heat festival

Inactive Publication Date: 2020-09-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the cavity size (especially the cross-sectional area) of the internal cooling structure of the hot end part is large, it is very easy to introduce hot joints in the precision casting process by directly using a thick solid ceramic core, thereby introducing a huge risk of metallurgical defects

Method used

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  • Hollow ceramic core stuffing method for expendable pattern precision casting
  • Hollow ceramic core stuffing method for expendable pattern precision casting
  • Hollow ceramic core stuffing method for expendable pattern precision casting

Examples

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Embodiment 1

[0028] This embodiment is to fill the cavity of the hollow ceramic core used in investment precision casting. The hollow ceramic core is as follows: figure 1 shown. The filling process is as figure 2 , including the following steps:

[0029] Step S1: Clean the surface of the hollow ceramic core and place it vertically on a fixed plane for later use;

[0030] Step S2: Mix 100g of 60# corundum sand and 35ml of silica sol according to the ratio. After fully stirring, fill it to one end of the inner cavity of the core, and then seal it. The thickness of the sealing layer is about 10mm, and let it stand for 10 minutes;

[0031] Step S3: Pour dry 24# corundum sand into the inner cavity of the core, and keep moderately tamping it with a wooden stick during the filling process until the filling is 10mm away from the opening at the other end of the core. Use the stirred 60# corundum sand and silica sol mixture (the mixing ratio is the same as that in step S2) to seal the opening at...

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Abstract

The invention discloses a hollow ceramic core stuffing method for expendable pattern precision casting, and belongs to the technical field of expendable pattern precision casting. The method comprisesthe following steps of plugging one end of a cavity of a hollow ceramic core with a plugging material I; taking 24# emery, performing pouring from the other end of the hollow ceramic core, and when the end is to be stuffed completely, plugging the other end of the cavity of the hollow ceramic core with a plugging material II; inserting a wood stick in the cavity of the hollow ceramic core; afterthe plugging materials at two ends of the hollow ceramic core are completely solidified and dried, removing the exposed part of the wood stick, and burnishing two exposed ends until a smooth state isachieved and granules are not remained; and finally, cleaning the outer surface of the ceramic core, so that remaining slurry and fine sand do not exist. In expendable pattern precision casting tests,the appearance of the stuffed ceramic core always maintains complete, the thermal conductivity is good, local heating segments are reduced, loosening trend of casts is notably reduced, and the technology stability is good.

Description

technical field [0001] The invention relates to the technical field of investment precision casting, in particular to a method for filling hollow ceramic cores used in investment precision casting. filling. Background technique [0002] With the continuous advancement of the industrial level, the society's demand for advanced gas turbines continues to rise. A more advanced gas turbine means that the outlet temperature of the gas turbine combustor needs to be further increased, which puts forward higher requirements on the temperature bearing capacity of the hot end components of the gas turbine. Usually, three effective methods are used to improve the comprehensive temperature bearing capacity of the hot end parts, namely, improving the temperature bearing capacity of the alloy material itself, increasing the internal cooling structure design of the hot end part, and adding a protective coating on the surface of the hot end part. However, with the continuous increase in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10B22C9/12
CPCB22C9/10B22C9/12
Inventor 董加胜王尧刘心刚徐正国楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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