US3570343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure for fine blanking
Assignee: Di Dro Systems Inc
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Filing: 1968-10-18
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Granted: 1971-03-16
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Expires: 1988-10-18
Abstract
Abstract The structure for fine blanking includes opposed die members one of which is supported by a hydraulic cushion, a die pad supported by a separate hydraulic cushion in an opening in the other die member and a blanking punch opposed to the die pad and having substantially the same dimension as the opening in the one die member positioned within the other die member. A gripping ring is provided on one of the die members at the periphery of a blank to be cut thereby. Piercing punches are provided extending through the die pad and operate in conjunction with piercing pads supported on the hydraulic cushion supporting the one die member. Separate hydraulic delay structure is provided in conjunction with both of the hydraulic cushions. The fine-blanking method disclosed includes moving the die members toward each other to clamp a metal workpiece tightly about the periphery of a blank to be cut therefrom whereby the gripping ring forces the metal of the workpiece inwardly toward the periphery of the blank to be cut therefrom, cutting the blank between the blanking punch and other die member with substantially no clearance therebetween, and piercing the blank. The die members are then moved away from each other and the slugs pierced from the blank and the cut blanks are sequentially ejected from the upper die member and the blanking punch in accordance with selected separate delay times.
Inventors
- 👤 Ervin E Wolnosky
- 👤 Waldemar Holz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:56
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/16; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2122; Y10T83/2124; Y10T83/2135; Y10T83/2142; Y10T83/215; Y10T83/2153; Y10T83/566; Y10T83/5669; Y10T83/5787; Y10T83/5805; Y10T83/869; Y10T83/8821; Y10T83/8858
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
216 words
Fine-blanking structure comprising opposed die members adapted to receive a workpiece therebetween from which a blank is to be cut, an opposed blanking punch and die pad operably associated with the die members, said blanking punch and one of said die members providing substantially no clearance therebetween in the closed position thereof, hydraulic cushion structure supporting at least one of said die members and at least one of said punch and die pad, means for moving the die members and the punch and die pad toward and away from each other whereby the workpiece exterior to the blank to be cut therefrom may be held under high pressure during cutting of the blank by the punch in cooperation with one of the die members, first delay means operably associated with the die pad for preventing ejection of a cut blank for a predetermined time after the die members have been moved away from each other subsequent to cutting a die blank from the workpiece, at least one piercing punch extending through the die pad and a piercing pad extending through the punch operably associated with the die members whereby a blank being cut may be pierced and second delay means operably associated with the piercing pad for delaying the ejection of slugs cut from the blank.
Claim 2
Dependent Claim
216 words
Fine-blanking structure comprising opposed die members adapted to receive a workpiece therebetween from which a blank is to be cut, an opposed blanking punch and die pad operably associated with the die members, said blanking punch and one of said die members providing substantially no clearance therebetween in the closed position thereof, hydraulic cushion structure supporting at least one of said die members and at least one of said punch and die pad, means for moving the die members and the punch and die pad toward and away from each other whereby the workpiece exterior to the blank to be cut therefrom may be held under high pressure during cutting of the blank by the punch in cooperation with one of the die members, first delay means operably associated with the die pad for preventing ejection of a cut blank for a predetermined time after the die members have been moved away from each other subsequent to cutting a die blank from the workpiece, at least one piercing punch extending through the die pad and a piercing pad extending through the punch operably associated with the die members whereby a blank being cut may be pierced and second delay means operably associated with the piercing pad for delaying the ejection of slugs cut from the blank.
Claim 3
Dependent Claim
39 words
Structure as set forth in claim 1 and further including means for separately varying the length of the delay provided by the delay means to sequence the ejection of the cut blank and the slugs cut from the blank.
Claim 4
Dependent Claim
13 words
Structure as set forth in claim 2, wherein the delay means are hydraulic.
Claim 5
Dependent Claim
35 words
Structure as set forth in claim 2 wherein the means for separately varying the length of the delay includes means for making the first delay longer than the delay provided by the second delay means.
Claim 6
Dependent Claim
35 words
Structure as set forth in claim 2 wherein the means for separately varying the length of the delay includes means for making the second delay longer than the delay provided by the first delay means.
Claim 7
Dependent Claim
46 words
Structure as set forth in claim 1 and further including means operably associated with at least one of the die members for urging the metal of the workpiece at the periphery of the blank toward the blank on clamping of the workpiece between the die members.
Claim 8
Dependent Claim
58 words
Structure as set forth in claim 6 wherein the means for urging the metal of the workpiece at the periphery of the blank toward the blank on clamping of the wOrkpiece between the die members includes a gripping ring having a V-shaped cross section on the one die member surrounding the blank to be cut from the workpiece.
Claim 9
Dependent Claim
292 words
Fine-blanking structure comprising opposed die members adapted to receive a workpiece therebetween from which a blank is to be cut, an opposed blanking punch and die pad operably associated with the die members, said blanking punch and one of said die members providing substantially no clearance therebetween in the closed position thereof, hydraulic cushion structure supporting at least one of said die members and at least one of said punch and die pad, means for moving the die members and the punch and die pad toward and away from each other whereby the workpiece exterior to the blank to be cut therefrom may be held under high pressure during cutting of the blank by the punch in cooperation with one of the die members, first delay means operably associated with the die pad for preventing ejection of a cut blank for a predetermined time after the die members have been moved away from each other subsequent to cutting a die blank from the workpiece, at least one piercing punch extending through the die pad and a piercing pad extending through the punch operably associated with the die members whereby a blank being cut may be pierced, second delay means operably associated with the piercing pad for delaying the ejection of slugs cut from the blank, a gripping ring having a V-shaped cross section on one of the die members surrounding the blank to be cut from the workpiece for urging the metal of the workpiece at the periphery of the blank toward the blank on clamping of the workpiece between the members and means for separately varying the length of the delay provided by the delay means to sequence the ejection of the cut blank and the slugs cut from the blank.
Claim 10
Dependent Claim
292 words
Fine-blanking structure comprising opposed die members adapted to receive a workpiece therebetween from which a blank is to be cut, an opposed blanking punch and die pad operably associated with the die members, said blanking punch and one of said die members providing substantially no clearance therebetween in the closed position thereof, hydraulic cushion structure supporting at least one of said die members and at least one of said punch and die pad, means for moving the die members and the punch and die pad toward and away from each other whereby the workpiece exterior to the blank to be cut therefrom may be held under high pressure during cutting of the blank by the punch in cooperation with one of the die members, first delay means operably associated with the die pad for preventing ejection of a cut blank for a predetermined time after the die members have been moved away from each other subsequent to cutting a die blank from the workpiece, at least one piercing punch extending through the die pad and a piercing pad extending through the punch operably associated with the die members whereby a blank being cut may be pierced, second delay means operably associated with the piercing pad for delaying the ejection of slugs cut from the blank, a gripping ring having a V-shaped cross section on one of the die members surrounding the blank to be cut from the workpiece for urging the metal of the workpiece at the periphery of the blank toward the blank on clamping of the workpiece between the members and means for separately varying the length of the delay provided by the delay means to sequence the ejection of the cut blank and the slugs cut from the blank.
Claim 11
Dependent Claim
35 words
Structure as set forth in claim 8 wherein the means for separately varying the length of the delay includes means for making the first delay longer than the delay provided by the second delay means.
Claim 12
Dependent Claim
35 words
Structure as set forth in claim 8 wherein the means for separately varying the length of the delay includes means for making the second delay longer than the delay provided by the first delay means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |