Repair of core positioning features in cast components

Patent metadata

Field	Value
Publication number	US-11458530-B2
Application number	US-202016786291-A
Country	US
Kind code	B2
Filing date	Feb 10, 2020
Priority date	Feb 10, 2020
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

An investment casting process for manufacturing a cast component is provided. The investment casting process includes forming a core, casting the cast component about the core such that a core positioning feature provides a location of an anticipated pilot hole in the cast component, removing the core from the cast component once the casting is completed, locating, forming and sizing a pilot hole to form a resized pilot hole that can receive a sealing plug and installing the sealing plug into the resized pilot hole.

First claim

What is claimed is:

1. An investment casting process for manufacturing a cast component comprising:
forming a core;
casting the cast component about the core such that a core positioning feature provides a location of an anticipated pilot hole in the cast component;
removing the core from the cast component once the casting is completed;
locating, forming and sizing a pilot hole at the location of the anticipated pilot hole to form a resized pilot hole that can receive a sealing plug;
installing the sealing plug into the resized pilot hole, whereby the sealing plug connects at least two opposing walls of an internal cavity; and
further comprising creating a wax pattern of the cast component surrounding the core, wherein additional wax material is added at a location of the core positioning feature when creating the wax pattern.

2. The investment casting process according to claim 1 , wherein the core positioning feature is a bumper integral with the core.

3. The investment casting process according to claim 1 , wherein the core positioning feature comprises a pin.

4. The investment casting process according to claim 1 , wherein the sizing of the pilot hole removes surface contaminants within the pilot hole to create a suitable surface for receiving the sealing plug.

5. The investment casting process according to claim 1 , further comprising machining the cast component after installing the sealing plug.

6. The investment casting process according to claim 1 , wherein the installing of the sealing plug comprises brazing the sealing plug to the cast component.

7. The investment casting process according to claim 1 , wherein the sealing plug forms at least a portion of an internal feature.

8. An investment casting process for manufacturing a cast component comprising:
forming a core comprising a main portion and bumpers integral with and extending outwardly from the main portion at a location to install a sealing plug relative to the cast component;
casting the cast component about the core such that the bumpers provide locations of pilot holes;
leaching the core from the cast component once the casting is completed such that an internal cavity is formed within the cast component;
locating, forming and sizing pilot holes located at at least one of the locations of the pilot holes to form at least one resized pilot hole receptive of the sealing plug; and
installing the sealing plug into the at least one resized pilot hole, wherein the casting comprises adding positive material around the bumpers.

9. The investment casting process according to claim 8 , further comprising machining the cast component after installing the sealing plug.

10. The investment casting process according to claim 8 , wherein the installing of the sealing plug into the at least one resized pilot hole comprises brazing the sealing plug to the cast component.

11. The investment casting process according to claim 8 ,
wherein the installing of the sealing plug forms at least a portion of an internal feature which is extendible across an internal cavity within the cast component.

Assignees

• United Technologies Corp
• Raytheon Tech Corp

Inventors

• Bergman Russell J
• Busta Carl
• Castle Lea Dynnette

Classifications

• B22C9/064 Primary

  Locating means for cores · CPC title

• B22C9/108

  Installation of cores · CPC title

• B22D29/002

  by leaching, washing or dissolving · CPC title

• B22C23/00

  Tools; Devices not mentioned before for moulding · CPC title

• B22C9/04

  Use of lost patterns · CPC title