US4416130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsing impact straightener
Assignee: Industrial Metal Products Corp
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Filing: 1981-03-20
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Granted: 1983-11-22
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Expires: 2001-03-20
Abstract
Abstract An automatic production workpiece straightener employing pulsing impact hammer peening blows on the concave curvature side of a distorted workpiece to straighten by imparting compressive stress to the surface fibers thereby permanently deflecting the workpiece in a straightening direction. As applied to rotatable shafts such as cast iron camshafts, a plurality of peening heads deliver rapidly pulsing axially spaced impact blows to cylindrical grooves in the shaft during a limited portion of each continuous revolution as required to provide straightening action with continuous or peening-interrupted automatic gauging for controlling and terminating the straightening action.
Inventors
- 👤 Edward E. Judge, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:25
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/06; B21K1/08; B21D; B21D3/00; B21D3/10; B23; B23P; B23P9/00; B23P9/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49286
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
62 words
Elongated production workpiece straightener characterized by means for gauging magnitude and plane of maximum workpiece distortion, means for peening the workpiece surface, and programmable means responsive to said gauging means for automatically controlling the application of said peening on the concave side of said plane of distortion to effect workpiece straightening through compressive elongation of workpiece surface fibers on said concave side.
Claim 2
Dependent Claim
62 words
Elongated production workpiece straightener characterized by means for gauging magnitude and plane of maximum workpiece distortion, means for peening the workpiece surface, and programmable means responsive to said gauging means for automatically controlling the application of said peening on the concave side of said plane of distortion to effect workpiece straightening through compressive elongation of workpiece surface fibers on said concave side.
Claim 3
Dependent Claim
24 words
Workpiece straightener as set forth in claim 1 further characterized by plural means for peening at different locations along the length of said workpiece.
Claim 4
Dependent Claim
22 words
Workpiece straightener as set forth in claim 2 including programmable means for selectively controlling individual and simultaneous peening at said different locations.
Claim 5
Dependent Claim
25 words
Workpiece straightener as set forth in claim 1, 2 or 3 including means for rotating said workpiece about its axis during said application of peening.
Claim 6
Dependent Claim
21 words
Workpiece straightener as set forth in claim 4 including means for selectively peening a limited arc of said workpiece during rotation.
Claim 7
Dependent Claim
27 words
Workpiece straightener as set forth in claim 4 including means on each side of said workpiece for selectively peening a limited arc of said workpiece during rotation.
Claim 8
Dependent Claim
28 words
Workpiece straightener as set forth in claim 4 including means for selectively peening a limited arc of said workpiece during rotation within a range of 45° to 120°.
Claim 9
Dependent Claim
43 words
Workpiece straightener as set forth in claim 4 including means for selectively peening a limited arc of said workpiece during rotation within a range of 45° to 120° and including programmable means for reducing the arc of peening as straightening approaches tolerance requirements.
Claim 10
Dependent Claim
31 words
Workpiece straightener as set forth in claim 4 including means for selectively reducing the number of peening locations as well as the effective arc of peening as straightening approaches tolerance requirements.
Claim 11
Dependent Claim
21 words
Workpiece straightener as set forth in claim 4 including means for oscillating peening action along a limited length of said workpiece.
Claim 12
Dependent Claim
17 words
Workpiece straightener as set forth in claim 4 including means for dampening workpiece vibration resulting from peening.
Claim 13
Dependent Claim
22 words
Workpiece straightener as set forth in claim 11 including means for dampening and gauging a common cylindrical portion of said rotating workpiece.
Claim 14
Dependent Claim
18 words
An elongated workpiece straightener as set forth in claim 4 including gauging means free of direct workpiece contact.
Claim 15
Dependent Claim
21 words
Workpiece straightener as set forth in claim 4 including programmable means for interrupting peening during successive intermediate and final gauging operations.
Claim 16
Dependent Claim
16 words
Workpiece straightener as set forth in claim 9 including peening means adapted for cast iron workpiece.
Claim 17
Dependent Claim
17 words
Workpiece straightener as set forth in claim 9 including peening means adapted for cast iron camshaft workpiece.
Claim 18
Dependent Claim
22 words
Workpiece straightener as set forth in claim 9 including means for peening cylindrical grooves intermediate cam lobes in a cast iron camshaft.
Claim 19
Dependent Claim
21 words
Workpiece straightener as set forth in claim 17 including peening tool means having an arcuate impact surface smaller than said grooves.
Claim 20
Dependent Claim
32 words
Workpiece straightener as set forth in claim 18 including means providing a frequency of peening impacts relative to rotational speed of said camshaft during peening providing a smooth band of surface working.
Claim 21
Dependent Claim
31 words
Workpiece straightener as set forth in claim 19 including means for providing peening impacts in the order of over 3,000 per minute during camshaft rotation in the order of 30 rpm.
Claim 22
Dependent Claim
13 words
Workpiece straightener as set forth in claim 4 including air hammer peening tools.
Claim 23
Dependent Claim
22 words
Workpiece straightener as set forth in claim 4 including air hammer peening tools adapted for air pressure regulated severity of peening blows.
Claim 24
Dependent Claim
24 words
Workpiece straightener as set forth in claim 16 including transfer means for progressively loading and unloading successive workpieces to and from the straightening station.
Claim 25
Dependent Claim
22 words
Workpiece straightener as set forth in claim 4 including dead center head and tail stock means for engaging the workpiece during rotation.
Claim 26
Dependent Claim
35 words
Workpiece straightener as set forth in claim 4 including scissors type dampening means for engaging opposite sides of a cylindrical portion of the workpiece with floating contact shoes capable of accommodating distortion eccentricity during rotation.
Claim 27
Dependent Claim
54 words
Workpiece straightener as set forth in claim 4 including scissors type dampening means for engaging opposite sides of a cylindrical portion of the workpiece with floating contact shoes capable of accommodating distortion eccentricity during rotation, said gauging means extending between scissor arms of said dampening means being adapted to gauge the same cylindrical surface.
Claim 28
Dependent Claim
82 words
Method for straightening elongated production workpiece including the steps of, automatically gauging magnitude and plane of maximum workpiece distortion, automatically peening the workpiece surface on the concave side of said plane of distortion to effect workpiece straightening through compressive elongation of workpiece surface fibers on said concave side, automatically changing the circumferential location of said workpiece surface during said peening, automatically gauging the straightening effects of said peening, and automatically controlling the application of further peening until straightening tolerance requirements are met.
Claim 29
Dependent Claim
82 words
Method for straightening elongated production workpiece including the steps of, automatically gauging magnitude and plane of maximum workpiece distortion, automatically peening the workpiece surface on the concave side of said plane of distortion to effect workpiece straightening through compressive elongation of workpiece surface fibers on said concave side, automatically changing the circumferential location of said workpiece surface during said peening, automatically gauging the straightening effects of said peening, and automatically controlling the application of further peening until straightening tolerance requirements are met.
Claim 30
Dependent Claim
16 words
Method of claim 27 including automatically peening the workpiece surface at different locations along its length.
Claim 31
Dependent Claim
16 words
Method of claim 28 including automatically selectively controlling individual and simultaneous peening at said different locations.
Claim 32
Dependent Claim
23 words
Method for straightening workpiece as set forth in claim 27, 28, or 29 including rotating said workpiece about its axis during said peening.
Claim 33
Dependent Claim
16 words
Method of claim 30 including automatically selectively peening a limited arc of said workpiece during rotation.
Claim 34
Dependent Claim
17 words
Method of claim 30 including automatically selectively peening a limited arc on said side of said workpiece.
Claim 35
Dependent Claim
21 words
Method of claim 30 including automatically selectively peening a limited arc of said workpiece within a range of 45° to 120°.
Claim 36
Dependent Claim
34 words
Method of claim 30 including automatically selectively peening a limited arc of said workpiece within a range of 45° to 120° and including automatically reducing the arc of peening as straightening approaches tolerance requirements.
Claim 37
Dependent Claim
27 words
Method of claim 31 including automatic selective reduction in the number of peening locations as well as the effective arc of peening as straightening approaches tolerance requirements.
Claim 38
Dependent Claim
25 words
Method of straightening an elongated workpiece as set forth in claim 30 including automatic oscillation of peening action along a limited length of said workpiece.
Claim 39
Dependent Claim
20 words
Method of straightening workpiece as set forth in claim 30 including the step of dampening workpiece vibration resulting from peening.
Claim 40
Dependent Claim
16 words
Method of straightening workpiece as set forth in claim 30 wherein said workpiece is cast iron.
Claim 41
Dependent Claim
17 words
Method of straightening workpiece as set forth in claim 35 wherein said workpiece is cast iron camshaft.
Claim 42
Dependent Claim
19 words
Method of straightening cast iron camshaft as set forth in claim 39 including peening cylindrical grooves intermediate cam lobes.
Claim 43
Dependent Claim
36 words
Method of straightening cast iron camshaft as set forth in claim 40 including peening with a frequency of peening impacts relative to rotational speed of said camshaft during peening providing a smooth band of surface working.
Claim 44
Dependent Claim
28 words
Cast iron camshaft straightener as set forth in claim 16 including adjustable means providing a rotational speed of said camshaft during peening in the order of 20-60 rpm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |