# US 12,005,535 B2 · Method for producing shrink-fitted member

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- Number: US 12,005,535 B2
- Document ID: US12005535B2
- Status: Granted
- Kind: B2
- Application number: 18/168,007
- Filed: 2023-02-13
- Published: 2023-10-12
- Granted: 2024-06-11
- Earliest claimed: 2022-03-25
- Assignees: NGK Insulators, Ltd.
- Applicants: NGK Insulators, Ltd.
- Inventors: Fumitaka Takeuchi; Shuhei Kuno; Seiya Sawada
- Web page: https://patentgrep.com/patent/US12005535B2

## CPC

- B23P 11/025: {by using heat or cold}
- B21D 22/20: Deep-drawing (special deep-drawing arrangements in, or in connection with, presses B21D24/00)
- B21D 53/06: of metal tubes
- B23P 15/26: heat exchangers {or the like (making heat exchangers by methods covered by other subclasses B21D53/02)}
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)

## Abstract

A method for producing a shrink-fitted member by arranging a pillar shaped ceramic body inside a deep-drawn stainless steel pipe and shrink-fitting them. The method includes: a preparing step of preparing the deep-drawn stainless steel pipe produced by deep-drawing and the pillar shaped ceramic body; a heating step of heating the deep-drawn stainless steel pipe to 900° C. or more; and a shrink-fitting step of inserting the pillar shaped ceramic body into the heated deep-drawn stainless steel pipe and shrink-fitting them.

## Claims

### Claim 1

A method for producing a shrink-fitted member by arranging a pillar shaped ceramic body inside a deep-drawn stainless steel pipe and shrink-fitting them, the method comprising:
a preparing step of preparing the deep-drawn stainless steel pipe produced by deep-drawing and the pillar shaped ceramic body;
a heating step of heating the deep-drawn stainless steel pipe to 900° C. or more; and
a shrink-fitting step of inserting the pillar shaped ceramic body into the heated deep-drawn stainless steel pipe and shrink-fitting them.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the deep-drawn stainless steel pipe is heated for 5 seconds or more.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the deep-drawn stainless steel pipe is not subjected to a heat treatment after the deep-drawing and before the heating step.

### Claim 4 (depends on 2)

The method according to claim 2, wherein the deep-drawn stainless steel pipe is not subjected to a heat treatment after the deep-drawing and before the heating step.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising a cooling step of cooling the shrink-fitted member after the shrink-fitting step.

### Claim 6 (depends on 2)

The method according to claim 2, further comprising a cooling step of cooling the shrink-fitted member after the shrink-fitting step.

### Claim 7 (depends on 3)

The method according to claim 3, further comprising a cooling step of cooling the shrink-fitted member after the shrink-fitting step.

### Claim 8 (depends on 4)

The method according to claim 4, further comprising a cooling step of cooling the shrink-fitted member after the shrink-fitting step.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the pillar shaped ceramic body is a honeycomb structure comprising: an outer peripheral wall; and a partition wall arranged on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face, or a honeycomb structure comprising: an outer peripheral wall; an inner peripheral wall; and a partition wall arranged between the outer peripheral wall and the inner peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face.

### Claim 10 (depends on 2)

The method according to claim 2, wherein the pillar shaped ceramic body is a honeycomb structure comprising: an outer peripheral wall; and a partition wall arranged on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face, or a honeycomb structure comprising: an outer peripheral wall; an inner peripheral wall; and a partition wall arranged between the outer peripheral wall and the inner peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face.

### Claim 11 (depends on 3)

The method according to claim 3, wherein the pillar shaped ceramic body is a honeycomb structure comprising: an outer peripheral wall; and a partition wall arranged on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face, or a honeycomb structure comprising: an outer peripheral wall; an inner peripheral wall; and a partition wall arranged between the outer peripheral wall and the inner peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face.

### Claim 12 (depends on 4)

The method according to claim 4, wherein the pillar shaped ceramic body is a honeycomb structure comprising: an outer peripheral wall; and a partition wall arranged on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face, or a honeycomb structure comprising: an outer peripheral wall; an inner peripheral wall; and a partition wall arranged between the outer peripheral wall and the inner peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face.

### Claim 13 (depends on 5)

The method according to claim 5, wherein the pillar shaped ceramic body is a honeycomb structure comprising: an outer peripheral wall; and a partition wall arranged on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face, or a honeycomb structure comprising: an outer peripheral wall; an inner peripheral wall; and a partition wall arranged between the outer peripheral wall and the inner peripheral wall, the partition wall defining a plurality of cells each extending from a first end face to a second end face.

### Claim 14 (depends on 1)

The method according to claim 1, wherein the deep-drawn stainless steel pipe has a thermal expansion coefficient of 10 to 22×10−6/° C. at 0 to 1100° C.

### Claim 15 (depends on 2)

The method according to claim 2, wherein the deep-drawn stainless steel pipe has a thermal expansion coefficient of 10 to 22×10−6/° C. at 0 to 1100° C.

### Claim 16 (depends on 3)

The method according to claim 3, wherein the deep-drawn stainless steel pipe has a thermal expansion coefficient of 10 to 22×10−6/° C. at 0 to 1100° C.

### Claim 17 (depends on 4)

The method according to claim 4, wherein the deep-drawn stainless steel pipe has a thermal expansion coefficient of 10 to 22×10−6/° C. at 0 to 1100° C.

### Claim 18 (depends on 5)

The method according to claim 5, wherein the deep-drawn stainless steel pipe has a thermal expansion coefficient of 10 to 22×10−6/° C. at 0 to 1100° C.

### Claim 19 (depends on 9)

The method according to claim 9, wherein the deep-drawn stainless steel pipe has a thermal expansion coefficient of 10 to 22×10−6/° C. at 0 to 1100° C.