Claims
- 1. A method of punching openings in a cylindrical tube comprising the step of placing the tube on a mandrel having at least one slidably supported punch, a backup die, and an ejector movably supported by the backup die, said method comprising the steps of urging the backup die into engagement with the outer circumference of the cylindrical tube, punching a slug from the inside of the cylindrical tube to its outside by extending the punch, retracting the backup die, ejecting the slug, and returning the backup die into engagement with the cylindrical tube while the ejector is extended for urging the punch into its retracted position.
- 2. A method as set forth in claim 1 wherein there are a plurality of punches, backup dies, ejectors, and the punches are all operated in sequence.
Priority Claims (3)
Number |
Date |
Country |
Kind |
59-262822 |
Dec 1984 |
JPX |
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59-268452 |
Dec 1984 |
JPX |
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59-268453 |
Dec 1984 |
JPX |
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CROSS-REFERENCE TO RELATED APPLICATION
This is a division of U.S. patent application Ser. No. 807,534, filed Dec. 11, 1985, now U.S. Pat. No. 4,700,444. U.S. Pat. No. 4,700,444 is a continuation-in-part of my application "Composite Cylinder Block And Method Of Making It", Ser. No. 704,535, filed Feb. 25, 1985, now U.S. Pat. No. 4,637,110, and assigned to the assignee of this application.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
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Parent |
807534 |
Dec 1985 |
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Continuation in Parts (1)
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704535 |
Feb 1985 |
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