US3649816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for hydraulic extrusion press
Assignee: Sunbeam Oster Co Inc
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Filing: 1970-11-09
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Granted: 1972-03-14
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Expires: 1990-11-09
Abstract
Abstract A computer control system for hydraulic extrusion presses and the like characterized in that the operator need only preset at a control console certain lengths and distances dictated by the characteristics of the billet to be extruded, without the necessity for setting limit switches on the press itself. Aside from this, the operation of the press is automatic during an extrusion cycle, resulting in smoother operation of the press, improvements in yield and greater uniformity of product. In addition, the control system incorporates an automatic slowdown of the stem before it contacts a dummy block and billet, thereby reducing damage to dies.
Inventors
- 👤 Alfred W Johnes
- 👤 James B Murtland Jr
- 👤 Perry Marvin Rockwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:46
CPC Classifications
B; B21; B21C; B21C31/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
In a control system for an extrusion press of the type wherein a billet is inserted into a billet container having a die at one end thereof and a stem is forced into the other end of said container to extrude the billet through the die; the combination of means including computer apparatus for automatically slowing down the rapid advance of said stem into said container just prior to the time that the billet is forced against said die, means including said computer apparatus for automatically slowing down the speed of said stem during extruSion of said billet just prior to the termination of extrusion when a predetermined discard length of said billet remains in the container, and means including said computer apparatus for stopping the advance of said stem when the discard length of the billet equals said predetermined discard length.
Claim 2
Dependent Claim
142 words
In a control system for an extrusion press of the type wherein a billet is inserted into a billet container having a die at one end thereof and a stem is forced into the other end of said container to extrude the billet through the die; the combination of means including computer apparatus for automatically slowing down the rapid advance of said stem into said container just prior to the time that the billet is forced against said die, means including said computer apparatus for automatically slowing down the speed of said stem during extruSion of said billet just prior to the termination of extrusion when a predetermined discard length of said billet remains in the container, and means including said computer apparatus for stopping the advance of said stem when the discard length of the billet equals said predetermined discard length.
Claim 3
Dependent Claim
61 words
The control system of claim 1 including a pulse generator operatively connected to said stem for producing a number of pulses proportional to the travel of said stem from its fully retracted position, and comparator means for comparing the pulses produced by said pulse generator with digital signals at the output of said computer apparatus for controlling movement of said stem.
Claim 4
Dependent Claim
31 words
The control system of claim 2 wherein pulses from said pulse generator are applied to an up-down counter and the count stored in said counter is applied to said comparator means.
Claim 5
Dependent Claim
47 words
The control system of claim 2 wherein said stem is advanced by rapid advance cylinders and a main pressure cylinder, and including pump means for supplying hydraulic fluid to said cylinders, motor means for driving said pump means, and pump control means controlled by said comparator means.
Claim 6
Dependent Claim
108 words
The control system of claim 1 including an operator''s console and means whereby the manually enters into said computer apparatus digital signals proportional to the total length between the trailing end of said stem in its fully retracted position and the end of a tool stack on the side of said die opposite said billet container, the length of said tool stack, the length of the stem, the length of said billet, the length of a dummy block inserted into said billet container behind the billet, the desired discard length of the billet, the desired slowdown distance from fast advance and the desired slowdown distance from extrude speed.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |