Method for enhancing strength of single crystal blade core by metal core support

Abstract

The invention provides a method for enhancing strength of a single crystal blade core by a metal core support. The method comprises the following steps: before a wax mold is combined, punching platinum-rhodium wires in wall thickness detecting point positions of a blade as a metal core support, wherein the height of the metal core support is 3-10 mm and a needle applying direction is a normal direction perpendicular to the blade surface; gripping the platinum-rhodium wires by using tweezers; heating the platinum-rhodium wires for 5-15 seconds on an alcohol lamp; punching the platinum-rhodium wires in a direction perpendicular to the blade surface; after fetching a small amount of white paraffin wax by using a metal stick and heating the white paraffin wax on the alcohol lamp for 1-5 seconds, dripping a wax liquid to the blade along the metal core support to form wax bumps; and after the wax bumps are cooled, trimming the shapes of the wax bumps by using the metal stick until the wax bumps are in smooth connection with the blade surface. The method provided by the invention has the advantages as follows: the metal liquid impact resisting capacity of a ceramic core in a high temperature state is effectively enhanced, defects of biased castings and core exposure are greatly reduced and the losses of waste products are greatly reduced. And moreover, the method for enhancing the strength of the single crystal blade core, provided by the invention, must bring about considerable economic benefits with the development of a casting process and the improvement of the overall performance of an aircraft engine.

Description

technical field [0001] The invention relates to the technical field of manufacturing hollow single-crystal blade cores used in aero-engines and gas turbines, in particular to a method for increasing the strength of single-crystal blade cores by using metal braces. Background technique [0002] The ceramic core is the key part to form its complex inner cavity and ensure the wall thickness of the blade. Since the ceramic core needs to bear the force of the high-pressure wax liquid in the process of pressing the wax mold, and needs to be preheated by high-temperature roasting and impacted by high-temperature molten steel during the casting process, the ceramic core must have sufficiently high room temperature strength and high temperature. strength. [0003] At present, the production of single crystal blades mostly uses silicon-steel ceramic cores, and because the inner cavity of single crystal blades is relatively complex and narrow, the strength of ceramic cores, especially...

AI Technical Summary

Problems solved by technology

[0003] At present, the production of single crystal blades mostly uses silicon-steel ceramic cores, and because the inner cavity of single crystal blades is relatively complex and narrow, the strength of ceramic cores, especially the high-temperature strength, is difficult to meet the production requirements of single crystal blades. The exposed core rate of the post-casting reaches more than 90%

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