Internal tooling configuration for the creation of z-channels in woven ceramic matrix composite preforms

Patent metadata

Field	Value
Publication number	US-12473236-B2
Application number	US-202318491578-A
Country	US
Kind code	B2
Filing date	Oct 20, 2023
Priority date	Oct 20, 2023
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A tooling assembly for use in forming z-channels in a fibrous ceramic preform includes a mandrel having a first plurality of holes extending into a mandrel body, a first subset of the plurality of holes being through-holes extending completely through the mandrel, and a second subset of the holes comprising blind pockets, and a plurality of channels extending longitudinally along the mandrel in a direction orthogonal to the first plurality of holes. The tooling assembly further includes an outer fixture at least partially enclosing the mandrel, the outer fixture including at least one piece comprising a second plurality of holes extending completely through the at least one piece, the second plurality of holes being aligned with respective corresponding ones of the first plurality of holes such that a needle can be inserted through each of the second plurality of holes in the at least one piece and into the respective ones of the first plurality of holes in the mandrel.

First claim

The invention claimed is:

1 . A tooling assembly for use in forming z-channels in a fibrous ceramic preform, the tooling assembly comprising:
a mandrel having:
a first plurality of holes extending into a mandrel body, a first subset of the plurality of holes being through-holes extending completely through the mandrel, and a second subset of the holes comprising blind pockets; and
a plurality of channels extending longitudinally along the mandrel in a direction orthogonal to the first plurality of holes; and
an outer fixture at least partially enclosing the mandrel, the outer fixture comprising:
at least one piece comprising a second plurality of holes extending completely through the at least one piece, the second plurality of holes being aligned with respective corresponding ones of the first plurality of holes such that a needle can be inserted through each of the second plurality of holes in the at least one piece and into the respective ones of the first plurality of holes in the mandrel.

2 . The tooling assembly of claim 1 , wherein the at least one piece of the outer fixture comprises a first piece removably securable to a second piece.

3 . The tooling assembly of claim 1 , wherein the outer fixture is formed from one of plastic, metal, and graphite.

4 . The tooling assembly of claim 1 , wherein the mandrel is a multipiece mandrel comprising a first mandrel piece and a second mandrel piece.

5 . The tooling assembly of claim 1 , wherein the mandrel is formed form graphite.

6 . The tooling assembly of claim 1 , wherein each of the first plurality of holes has a first diameter.

7 . The tooling assembly of claim 6 , wherein each of the second plurality of holes has a second diameter.

8 . The tooling assembly of claim 7 , wherein the first diameter is the same as the second diameter.

9 . The tooling assembly of claim 7 , wherein the first diameter is greater than the second diameter.

10 . The tooling assembly of claim 1 , wherein at least a subset of the first plurality of holes is oriented such that a needle can be inserted within 10 degrees of normal to an outer surface of preform supported by the mandrel.

11 . The tooling assembly of claim 1 , wherein at least a subset of the first plurality of holes is oriented such that a needle can be inserted within 15 degrees of normal to an outer surface of preform supported by the mandrel.

Assignees

• Rtx Corp

Inventors

• Fernandez Robin H
• Riehl John D
• Kole Molly

Classifications

• B26F1/24 Primary

  Perforating by needles or pins · CPC title

• B28B1/42

  using mixtures containing fibres, e.g. for making sheets by slitting the wound layer · CPC title

• B28B7/18

  the holes passing completely through the article · CPC title

• B28B1/522

  for producing multi-layered articles (B28B1/526, B28B1/527 take precedence) · CPC title

• B28B7/28

  Cores; Mandrels {(B28B1/44 takes precedence; of special materials in general B28B7/34; cores for making blind holes in situ E04G15/04; for making recesses E04G15/06)} · CPC title