US3713312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for straightening or blending elongated workpieces
Assignee: Individual
•
Filing: 1971-09-07
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Granted: 1973-01-30
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Expires: 1991-09-07
Abstract
Abstract A method of straightening an elongated workpiece, in which the workpiece is supported at two spaced points and straightening forces are applied between these points by an automatically controlled hydraulic ram, governed by a programming system which causes the first stroke of the ram to defect the work beyond the desired final shape by a distance approximately equal to the calculated maximum elastic deformation, the load is then removed and the residual error sensed, and a further series of strokes applied at constant increments, the residual error being sensed between strokes and used to initiate a second series of stroke increments of smaller value until the residual error falls below a final preselected value at which acceptable straightness has been achieved.
Inventors
- 👤 R Galdabini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
B; B21; B21D; B21D3/00; B21D3/10; Y; Y10; Y10S; Y10S72/00; Y10S72/702
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A method of straightening or applying controlled bending to an elongated workpiece, in which the workpiece is subjected to a bending stroke which imparts to it a deformation beyond the desired final shape, this deformation as measured beyond the desired final shape being approximately equal to, or slightly greater than, the estimated maximum elastic deformation, aNd the workpiece is then unloaded and subjected to a series of bending strokes which impart progressively increasing deformation according to a preselected programme to the workpiece, and the residual error between the actual and desired shapes is sensed when the workpiece is unloaded between at least some of said strokes, and when the residual error falls below a first preselected value the workpiece is subjected to a further series of strokes of smaller progressive increments, according to another preselected program, and the residual error is again sensed when the workpiece is unloaded between strokes, and when the final residual error falls below a second preselected value, the operation is terminated.
Claim 2
Independent Claim
166 words
A method of straightening or applying controlled bending to an elongated workpiece, in which the workpiece is subjected to a bending stroke which imparts to it a deformation beyond the desired final shape, this deformation as measured beyond the desired final shape being approximately equal to, or slightly greater than, the estimated maximum elastic deformation, aNd the workpiece is then unloaded and subjected to a series of bending strokes which impart progressively increasing deformation according to a preselected programme to the workpiece, and the residual error between the actual and desired shapes is sensed when the workpiece is unloaded between at least some of said strokes, and when the residual error falls below a first preselected value the workpiece is subjected to a further series of strokes of smaller progressive increments, according to another preselected program, and the residual error is again sensed when the workpiece is unloaded between strokes, and when the final residual error falls below a second preselected value, the operation is terminated.
Claim 3
Independent Claim
166 words
A method of straightening or applying controlled bending to an elongated workpiece, in which the workpiece is subjected to a bending stroke which imparts to it a deformation beyond the desired final shape, this deformation as measured beyond the desired final shape being approximately equal to, or slightly greater than, the estimated maximum elastic deformation, aNd the workpiece is then unloaded and subjected to a series of bending strokes which impart progressively increasing deformation according to a preselected programme to the workpiece, and the residual error between the actual and desired shapes is sensed when the workpiece is unloaded between at least some of said strokes, and when the residual error falls below a first preselected value the workpiece is subjected to a further series of strokes of smaller progressive increments, according to another preselected program, and the residual error is again sensed when the workpiece is unloaded between strokes, and when the final residual error falls below a second preselected value, the operation is terminated.
Claim 4
Independent Claim
166 words
A method of straightening or applying controlled bending to an elongated workpiece, in which the workpiece is subjected to a bending stroke which imparts to it a deformation beyond the desired final shape, this deformation as measured beyond the desired final shape being approximately equal to, or slightly greater than, the estimated maximum elastic deformation, aNd the workpiece is then unloaded and subjected to a series of bending strokes which impart progressively increasing deformation according to a preselected programme to the workpiece, and the residual error between the actual and desired shapes is sensed when the workpiece is unloaded between at least some of said strokes, and when the residual error falls below a first preselected value the workpiece is subjected to a further series of strokes of smaller progressive increments, according to another preselected program, and the residual error is again sensed when the workpiece is unloaded between strokes, and when the final residual error falls below a second preselected value, the operation is terminated.
Claim 5
Dependent Claim
49 words
A method according to claim 1, in which the first series of strokes are of progressively increasing length, the increments being of constant value, and the second series of strokes are also of progressively increasing length, with constant increments of smaller value than the increments of the first series.
Claim 6
Dependent Claim
16 words
A method according to claim 1, in which the residual error is sensed after each stroke.
Claim 7
Dependent Claim
34 words
A method according to claim 1, in which the workpiece is supported on two spaced supports, and the straightening or bending strokes are applied to the workpiece between the supports by a fluid-operated ram.
Claim 8
Dependent Claim
95 words
A method according to claim 1, in which the length of each stroke is determined by an automatic control system having an input from an error senser arranged to sense the residual error when the workpiece is unloaded, and an output connected to a ram for applying the bending or straightening strokes, so as to control the length thereof, the control system including a programming section arranged to apply one of two preselected programs of increments to the output signal, depending upon whether the sensed residual error is above or below the first preselected value.
References Cited (Backward Citations)
US3459018A
Cited
US3481170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |