Claims
- 1. A method of forming a container end panel from a blank of material comprising the steps of:
- (a) engaging a central section of the blank between a pressure pad and a punch center and wiping a radially outboard section of the blank over said punch center by moving a die form ring and a concentrically disposed draw ring relative to the punch center, thereby forming a cupshaped member having a formed bottom panel and an annular peripheral section; and
- (b) holding a portion of said peripheral section and forming a countersink radius adjacent said bottom panel by pulling material from said peripheral section.
- 2. The method of claim 1 wherein said countersink radius is formed at least partially by moving the die form ring around the pressure pad while engaging a radially outboard area of the peripheral section between the draw ring and an opposed blank punch.
- 3. The method of claim 2 wherein the countersink radius is finally set by engaging it between a panel form die and an opposed resiliently supported pressure pad.
- 4. The method of claim 3 wherein a chuckwall is formed between said countersink radius and said peripheral section;
- the resiliently supported pressure pad holding the chuckwall against the panel form die during the travel of a panel form punch concentrically with the panel form die.
- 5. A method of forming a container end piece from a sheet of metal material in a press having a fixed base and a movable platen comprising the steps of;
- (a) blanking a workpiece from the sheet of metal material;
- (b) forming a cup from said workpiece by wiping its peripheral edge over a punch center supported on the movable platen and by causing relative movement between the workpiece and a draw ring and a die form ring to form a cup having a flange area, a central body area, and a preliminary chuckwall interconnecting the flange area and the central body area by radiused areas, with said chuckwall and chuckwall angle being formed between said die form ring and said punch center;
- (c) then reversing the cup by engaging said chuckwall between a panel form die and a resiliently supported pressure pad and causing relative movement between the cup and a panel form punch with respect to the panel form die to shorten said chuckwall and reduce the radius between said chuckwall and said central body portion while said chuckwall is supported between the panel form die and the pressure pad.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 889,487 filed 28 July 1986, now U.S. Patent 4,735,863 and which in turn is a division of application Ser. No. 768,162 filed 22 Aug. 1985, now U.S. Patent 4,637,961 issued 20 Jan. 1987, which in turn was a continuation of application Ser. No. 571,243 filed 16 Jan. 1984, now abandoned, and all assigned to the same assignee. There is also a continuation of Ser. No. 768,162, which is now U.S. Patent 4,704,887. Application Ser. No. 571,243 was filed contemporaneously with application Ser. No. 571,050, now U.S. Patent 4,561,280; with application 571,237, now U.S. Patent 4,567,746; and with application 571,051, now U.S. Patent 4,599,884.
US Referenced Citations (54)
Foreign Referenced Citations (5)
Number |
Date |
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255869 |
Jul 1967 |
ATX |
681270 |
Mar 1964 |
CAX |
54101 |
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DEX |
1535677 |
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FRX |
1190791 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
768162 |
Aug 1985 |
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Continuations (2)
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Number |
Date |
Country |
Parent |
889487 |
Jul 1986 |
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Parent |
571243 |
Jan 1984 |
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