Patent US9333544B2 successfully refreshed from Google Patents.
US9333544B2
Active / In Force
US
⏱️ 6.4 years remaining
Plug used in piercing machine
Assignee: Nippon Steel Corp
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Filing: 2013-03-26
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Granted: 2016-05-10
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Expires: 2033-03-26
Abstract
Abstract To increase the life of a plug used in a piercing machine for piercing-rolling a billet. The plug ( 10 ) is used in a piercing machine ( 30 ) that piercing-rolls a billet ( 36 ). The plug ( 10 ) includes a plug body ( 12 ), a build-up layer ( 14 ), and a sprayed film ( 16 ). The build-up layer ( 14 ) is formed on a surface of the plug body ( 12 ). The sprayed film ( 16 ) covers at least an area ranging from the rear end of the build-up layer ( 14 ) to a position of the maximum outer diameter of the plug body ( 12 ).
Inventors
- 👤 Yasuyoshi Hidaka
- 👤 Yasuto Higashida
- 👤 Kazuhiro Shimoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:27
CPC Classifications
B; B21; B21B; B21B28/00; B21B19/00; B21B19/02; B21B19/04; B05; B05D; B05D1/00; B05D1/02; B05D3/00; B05D3/12; B21B25/00; C23C4/005; C; C23; C23C; C23C4/00; C23C4/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A piercing machine for piercing-rolling a billet, the piercing machine comprising: a plug; a mandrel having a front end, the plug being attached to the front end; and a pair of skew rolls located opposite to each other, the plug being located between the skew rolls; the plug comprising: a plug body; a build-up layer formed on a surface of the plug body, the build-up layer located at least in an area between a front end portion of the plug body and a position 3 cm backward of a position opposite to a portion at which a spacing between the pair of skew rolls is shortest; and a sprayed film covering at least an area ranging from a rear end of the build-up layer to a position of a maximum outer diameter of the plug body.
Claim 2
Dependent Claim
136 words
A piercing machine for piercing-rolling a billet, the piercing machine comprising: a plug; a mandrel having a front end, the plug being attached to the front end; and a pair of skew rolls located opposite to each other, the plug being located between the skew rolls; the plug comprising: a plug body; a build-up layer formed on a surface of the plug body, the build-up layer located at least in an area between a front end portion of the plug body and a position 3 cm backward of a position opposite to a portion at which a spacing between the pair of skew rolls is shortest; and a sprayed film covering at least an area ranging from a rear end of the build-up layer to a position of a maximum outer diameter of the plug body.
Claim 3
Dependent Claim
82 words
The plug according to claim 1 , wherein the plug body further comprises: a first body portion including the front end portion; and a second body portion having an outer diameter larger than that of a rear end of the first body portion, and extending from the rear end of the first body portion, wherein the build-up layer is formed on the surface of the first body portion, and the sprayed film is formed on the surface of the second body portion.
Claim 4
Dependent Claim
29 words
The plug according to claim 1 , wherein the surface of the build-up layer and the surface of the sprayed film connect to each other in a smooth fashion.
Claim 5
Dependent Claim
14 words
The plug according to claim 1 , wherein the build-up layer contains a carbide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2019-05-10 | 2019-11-09 | 2020-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2023-05-10 | 2023-11-09 | 2024-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2027-05-10 | 2027-11-09 | 2028-05-10 | $7700.00 | Pending Window |