US3890863A - Stamping machine for slotting core plates - Google Patents

Stamping machine for slotting core plates Download PDF

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Publication number
US3890863A
US3890863A US503160A US50316074A US3890863A US 3890863 A US3890863 A US 3890863A US 503160 A US503160 A US 503160A US 50316074 A US50316074 A US 50316074A US 3890863 A US3890863 A US 3890863A
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US
United States
Prior art keywords
carriage
stamping machine
stepping motor
drive spindle
spindle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US503160A
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English (en)
Inventor
Markus Reihle
Erich Harsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Mueller Weingarten AG
Maschinenfabrik Weingarten AG
Original Assignee
Maschinenfabrik Weingarten AG
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Assigned to MASCHINENFABRIK MULLER-WEINGARTEN AKTIENGESELLSCHAFT reassignment MASCHINENFABRIK MULLER-WEINGARTEN AKTIENGESELLSCHAFT CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MASCHINEN FABRIK WEINGARTEN AKTIENGESELLSCHAFT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/22—Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/162—With control means responsive to replaceable or selectable information program
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4564—With means to produce plurality of work-feed increments per tool cycle
    • Y10T83/4567—Including supplemental work-feed means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4607—With rotary work-carrier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/654—With work-constraining means on work conveyor [i.e., "work-carrier"]
    • Y10T83/6563—With means to orient or position work carrier relative to tool station

Definitions

  • a stamping machine for slotting annular segmentshaped plates has a movable carriage to which the plate to be slotted is clamped, an arcuate template in engagement with the carriage for guiding the latter in a circularly arcuate path, at least two stepping motors and a drive spindle having a driven side coupled to the stepping motors and a driving side coupled to the carriage, whereby the carriage is displaced in response to the drive spindle movements effected by the stepping motors.
  • This invention relates to a stamping machine for providing slots in large-diameter core plates formed of annular segments.
  • the stamping machine is of the type having a carriage which supports the core plate segments and which is movable stepwise along a curved template.
  • Core plates (laminae) for rotary electric machinery are generally manufactured on automatically operating stamping machines which have rotatable and adjustable clamping tables for accommodating core plates of different diameters.
  • the clamping table executes, for every stroke of the ram that carries the stamping die, a rotary step corresponding to the required slot spacing (pitch) in the core plate.
  • Core plates of large dimensions are, particularly for the purpose of saving material, formed of annular segments rather than constituting a single-piece annulus. In case of very large dimensions, however, it is difficult to slot these annular core plate segments with known automatic stamping machines if the largest possible distance of the rotary axis of the clamping table from the die tool is smaller than the radius of the core plate segment to be slotted.
  • stamping machine of the type disclosed in the above-mentioned German Accepted Published Patent Application, by providing separate, electronically controlled stepping motors, preferably with hydraulic torque amplification, for the displacement of the clamping table in the one and in the other direction.
  • a stamping machine equipped in this manner is advantageous in that core plate segments of desired dimensions and desired number of slots may be manufactured, since the rotary axis of the clamping table can be moved with great accuracy to come to a rest on a circle about the rotary axis of the core plate segment to assume terminal positions where the stamping proper takes place (the rotary axis of the core plate segment lies externally of the rotary axis of the clamping table).
  • a stamping machine in which the core plate segments are fastened to a carriage which is displaceable along a stationary arcuate template.
  • This template ensures a curved feed path.
  • the carriage is provided with a toothed segment (toothed rack) which cooperates with a pawltype driving mechanism or a drive pinion.
  • the drive pinion in turn, is driven by means of a Ferguson-drive with the interconnection of a change-speed gearing.
  • a disadvantage of this arrangement resides not only in the fact that for each slot pitch a different change-speed gearing is necessary but also that the manufacture of curved toothed racks or pawl rods is very complex and thus inaccuracies may occur.
  • a drive spindle which is operatively connected with at least two electronically controlled stepping motors each executing sufficiently small and predetermined individual steps.
  • the two stepping motors have differing capabilities of resolution, that is, the one and the other stepping motors cause, per step, displacements of different magnitudes of the carriage.
  • the first stepping motor for the purpose of generating a rotary motion of the drive spindle, is connected with the latter in a direct, mechanical manner, whereas the drive spindle is operatively connected with the second stepping motor in such a manner that, by interconnecting a drive element which converts the rotary motion of the second stepping motor into a longitudinal motion, the drive spindle is axially displaceable in addition to its rotary motion.
  • FIG. 1 is a schematic front elevational view of a preferred embodiment of the invention.
  • FIG. 2 is a schematic side elcvational view of the same embodiment.
  • FIG. 3 is a schematic top plan view of the same embodiment, carrying a rotor core plate segment.
  • FIG. 4 is a sectional view of some of the components of the same embodiment taken along line A-B of FIG. 3.
  • FIG. 5 is a sectional view taken along line CD of FIG. 3.
  • FIG. 6 is a schematic top plan view of the same embodiment, carrying a stator core plate segment.
  • FIG. 7 is a sectional view of some of the components of the same embodiment taken along line EF of FIG. 6.
  • FIGS. 1 and 2 the stamping machine schematically illustrated therein has a clamping table 1 which is displaceable on guide rails 2 towards and away from a die tool (not shown) attached to a reciprocating ram 3.
  • a clamping table 1 For displacing the clamping table 1 there is provided, for example, a conventional threaded spindle 4 connected to a hand wheel 5.
  • an arcuate template 6 which has a center of curvature 6a and which serves as a guide for a carriage 7 mounted on the template 6 in a displaceable manner.
  • the carriage 7 is, for the purpose of reducing friction, provided with guide rollers 8 and 9 which engage, respectively, the lateral arcuate faces 6b and 6c of the template 6.
  • guide rollers 8 and 9 which engage, respectively, the lateral arcuate faces 6b and 6c of the template 6.
  • two guide rollers on each side of the template 6 suffice.
  • the two guide rollers 9 at the inner face 6c of the template 6 are, in a manner known by itself, supported each on a pin 10 which is eccentric with respect to the rotary axis of the associated roller 9. By rotating pins 10, the guide rollers 9 at the face 60 of the template 6 may be adjusted to achieve a clearance-free, biased engagement of the rollers with the template 6.
  • the carriage 7, as illustrated in FIGS. 3 and 4, has a support 11 comprising a clamping device 12 for the core plate segment 13 which may be, for example, a rotor core segment having a center 13a.
  • a drive spindle 14 which may be formed as a ball-circulating spindle and which may be, at its driving side, threaded into a ballcirculating nut 15.
  • the latter is, by means of a pin not shown, coupled to the carriage 7 in such a manner that the ball-circulating nut 15 is pivotable in a horizontal plane about an axis 16 which is perpendicular to the thread axis 15a (and thus the axis of the drive spindle 14).
  • the nut 15 is, however, prevented from rotating about the spindle axis relative to the carriage 7.
  • the spindle-andnut assembly 14, 15 may be regarded as a worm-and-screw arrangement wherein a rotation of the component 14 about its longitudinal axis causes a translational movement of the component 15.
  • the drive spindle 14 In the zone of its driven side, the drive spindle 14, as illustrated in FIG. 5,journals in a setting socket 17.
  • the socket 17 and the drive spindle 14 are clamped together by means of a coupling 18 through an axial bearing 19 and an annular collar 14a forming part of the spindle 14.
  • the setting socket 17 is, by means of a clearance-free thread 170, axially movable by rotation in and with respect to a bearing sleeve 20 provided with a complemental inner thread 20a.
  • the bearing sleeve 20 is fixedly secured to a bearing plate 21.
  • the latter is pivotal about the axis 22a of two aligned stub shafts 22 which, in turn, journal in two parallelspaced bearing plates 23 affixed to the clamping table 1.
  • the drive spindle 14 is driven by a first stepping motor 24, the drive shaft 25 of which is directly connected with the drive spindle 14 by the coupling 18 to effect a direct torque transmission from the drive shaft 25 to the drive spindle 14.
  • the stepping motor 24 is affixed to a support plate 26 from which there projects at least one bolt 27 which, in turn, extends in a clearance-free manner into a bore provided in the bearing plate 21. Since the support plate 26, as it will be explained in more detail later, should be capable of executing a certain longitudinal displacement together with the stepping motor 24 secured thereto, the bolt 27 is guided in the bearing plate 21 by means of a ball guide 28.
  • a second stepping motor 29 the drive shaft of which carries a pinion 30 ,which meshes with a ring gear 17b attached to and situated externally of the setting socket 17.
  • FIGS. 6 and 7 differ from FIGS. 3 and 4, respectively, merely in that the core plate segment rather clamped on the support 11 is a stator, rahter than a rotor core plate segment.
  • the clamping of the core plate segment 13 to the support 11 of the carriage 7 is effected in such a manner that the center 13a of the core plate segment 13 coincides with the center of curvature 6a of the template 6 previously affixed to the carriage 7.
  • the individual clamping devices 12 may be adjustable for core plate segments of different dimensions. Subsequently, by turning the hand wheel 5, the clamping table is shifted by the threaded spindle 4 until the coinciding center points 6a and 13a assume the required distance from the stamping tool (not shown) affixed to the ram 3. In this manner, the diameter of the slot pitch circle is determined and the carriage 7 can be immobilized to prevent any unintended displacement thereof.
  • the carriage 7 is in the position illustrated in FIG. 3.
  • the stamping machine then executes, in a continuous operation, the number of slotting steps necessary for the particular core plate segment 13.
  • the drive system formed of the two stepping motors 24 and 29 shifts the carriage 7 by the intermediary of the drive spindle 14 in a stepwise manner after each slotting step.
  • the magnitude of the stepwise shift of the carriage 7 is determined as a function of the pitch mag nitude of the slots Nl-N7 to be cut in the core plate segment 13.
  • the magnitude of the stepwise shift is expressed in terms of the angular rotation about the centers 60 and 13a and equals the slot pitch.
  • the stamping machines For the purpose of maintaining the work period relating to slotting of one core plate segment 13 at a small value, the stamping machines usually operate with very high stroke frequencies. It follows that the period which is available for shifting the core plate segment 13 by one slot pitch by shifting the carriage 7 along the arcuate template 6 is correspondingly small. To accomplish an accurate carriage feed despite the small available time, the driving of the drive spindle 14 is effected by the two stepping motors 24 and 29. Each of these motors effects one predetermined part of the feed motion of the carriage 7.
  • the stepping motor 24 upon energization of the stepping motor 24, its rotary motion is directly transmitted to the drive spindle 14 which, accordingly, linearly shifts the carriage 7 (by virtue of the linear displacement of the nut 15 on and with respect to the spindle 14) by a distance that is the function of the thread pitch of the spindle 14.
  • the stepping motor 29 may be simultaneously energized; its rotary motion is converted through the pinion 30 and the ring gear 17a into a longitudinal displacement of the setting socket 17.
  • the latter and the spindle l4 shift axially as a unit.
  • the resolution capacity of the stepping motor 24 or the extent of motion caused by one step of the stepping motor 24 is maintained at a relatively large value, whereas that of the stepping motor 29 is maintained at a relatively small value.
  • the stepping motors themselves are so selected that the angle of rotation of the output shaft of the stepping motor 24 during one step is greater than that of the stepping motor 29.
  • the angle of rotation during one step is identical in both stepping motors 24, 29, but along the force path between the second stepping motor 29 and the carriage 7 there is inserted a conventional step-down gear (constituted, for example, by meshing gears 17b and 30, having a predetermined step-down ratio).
  • the stepping motor 24 causes by rotating the drive spindle l4 a shift of the nut 15 by a distance of 8.5 mm in 17 coarse steps of 0.5 mm each, while simultaneously, the stepping motor 29 effects the remaining longitudinal displacement of 0.36 mm of the nut 15 in eighteen steps of 0.02 mm each by rotating the socket 17 in the bearing sleeve and thus causing a purely axial shift of the drive spindle 14 (and the nut 15) through a distance of 0.36 mm.
  • any required carriage feed may be effected with a small number of control commands of the stepping motors 24 and 29.
  • control commands of the stepping motors 24 and 29 it is possible not only to add the individual setting motions as outlined before. but also to subtract the same as it will be now described.
  • the stepping motor 14 assuming again a required displacement of 8.86 mm, executes eighteen steps of 0.5 mm each for advancing the carriage 7 by a distance of9 mm.
  • the stepping motor 29 is actuated for executing seven steps of 0.02 mm each in the rearward direction with respect to the longitudinal displacement of the socket 17.
  • the stepping motor 24 executes, for one particular core plate segment, always a constant number of steps while the stepping motor 29 is programmed to execute the required number of steps in order to ensure an exact slot pitch or, as the case may be, the differing adjustments based on the circular path function.
  • a significant advantage of the stamping machine according to the invention resides in the fact that by using a first stepping motor causing a relatively coarse displacement per step and a second stepping motor causing a relatively fine displacement per step, the setting speed for positioning the core plate segment can be increased without neglecting fine adjustment, and consequently, the stroke frequency of the die tool may be augmented.
  • a stamping machine for slotting annular segmentshaped plates including a carriage for supporting the plate to be slotted; means for movably supporting the carriage; an arcuate template in engagement with the carriage for guiding the carriage in a circularly arcuate path, the improvement comprising:
  • a drive spindle having a driven side and a driving side
  • a stamping machine as defined in claim 1 including means for effecting carriage displacements of different magnitudes in response to one step of said first stepping motor and one step of said second stepping motor.
  • direct torque transmitting means directly connecting said first stepping motor with said driven side of said drive spindle for imparting a rotation to the latter; said direct torque transmitting means forming part of said coupling means;
  • second conversion means for converting a rotary motion of said second stepping motor into a translational motion; said second conversion means connecting said second stepping motor to said driven side of said drive spindle for imparting an axial shift to the latter; said second conversion means forming part of said coupling means.
  • said second conversion means including a setting socket through which extends a Zone of said driven side of said drive spindle, said setting socket having external threads; and means in said setting socket for preventing an axial displacement of said drive spindle with respect to said setting socket.
  • a stamping machine as defined in claim 6, further comprising a support plate carrying said first stepping motor; and means for securing said support plate to said bearing plate for relative movement between said support plate and said bearing plate.
  • said means for securing said support plate to said bearing plate includes at least one bolt affixed to said support plate and extending parallel to said drive spindle in a direction towards said bearing plate; and guide means in said bearing plate for slidably receiving said bolt.
  • a stamping machine as defined in claim 11, wherein said means connecting said second stepping motor with said setting socket includes a ring gear affixed to said setting socket and a pinion affixed to an output shaft of said second stepping motor, said ring gear and said pinion being in a meshing relationship with one another.
  • said means connecting said driving side of said spindle to said carriage includes a ball-circulating nut affixed to said carriage non-rotatably with respect to said drive spindle; said drive spindle extending through said nut and being operatively connected thereto for causing a shift of said nut in response to the motion of said drive spindle.
  • a stamping machine as defined in claim 1 including a plurality of rollers secured to said carriage, said rollers being in engagement with arcuate, parallel, inner and outer faces of said arcuate template for guiding said carriage along said arcuate template.
  • each roller cooperating with one of said faces of said arcuate template has a fixed support in said carriage; and each roller cooperating with the other of said faces has an adjustable support in said carriage for urging each roller cooperating with said other of said faces against the latter with a bias.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
US503160A 1973-09-05 1974-09-04 Stamping machine for slotting core plates Expired - Lifetime US3890863A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2344697 1973-09-05

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US3890863A true US3890863A (en) 1975-06-24

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US503160A Expired - Lifetime US3890863A (en) 1973-09-05 1974-09-04 Stamping machine for slotting core plates

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US (1) US3890863A (enExample)
CH (1) CH576298A5 (enExample)
FR (1) FR2242169B3 (enExample)
SE (1) SE411713B (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232575A (en) * 1977-11-16 1980-11-11 L. Schuler Gmbh Arrangement for punching out circular blanks
US5911806A (en) * 1995-10-07 1999-06-15 Schuler Pressen Gmbh & Co. Groove stamping machine adaptable to various stator and rotor plate sizes
EP1335480A1 (fr) * 2002-02-11 2003-08-13 Moteurs Leroy-Somer Procédé et machine pour la fabrication d'un circuit magnétique de machine électrique
CN111278582A (zh) * 2017-10-18 2020-06-12 Hsf自动化有限责任公司 用于冲口的设备及冲压系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439557C2 (de) * 1974-08-17 1979-09-06 Maschinenfabrik Weingarten Ag, 7987 Weingarten Stanzmaschine zum Nuten von in Kreisringsegmente zerlegten Dynamoblechen größeren Durchmessers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US880413A (en) * 1905-03-14 1908-02-25 Oberlin Smith Notching-press.
US951169A (en) * 1909-01-30 1910-03-08 Westinghouse Electric & Mfg Co Automatic feeding mechanism for machine-tools.
US2433117A (en) * 1945-11-14 1947-12-23 Hallander Edward Notching press
US3459079A (en) * 1967-09-29 1969-08-05 Koppy Tool Corp Indexing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US880413A (en) * 1905-03-14 1908-02-25 Oberlin Smith Notching-press.
US951169A (en) * 1909-01-30 1910-03-08 Westinghouse Electric & Mfg Co Automatic feeding mechanism for machine-tools.
US2433117A (en) * 1945-11-14 1947-12-23 Hallander Edward Notching press
US3459079A (en) * 1967-09-29 1969-08-05 Koppy Tool Corp Indexing machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232575A (en) * 1977-11-16 1980-11-11 L. Schuler Gmbh Arrangement for punching out circular blanks
US5911806A (en) * 1995-10-07 1999-06-15 Schuler Pressen Gmbh & Co. Groove stamping machine adaptable to various stator and rotor plate sizes
EP1335480A1 (fr) * 2002-02-11 2003-08-13 Moteurs Leroy-Somer Procédé et machine pour la fabrication d'un circuit magnétique de machine électrique
FR2835977A1 (fr) * 2002-02-11 2003-08-15 Leroy Somer Moteurs Procede et machine pour la fabrication d'un circuit magnetique de machine electrique
US20040010907A1 (en) * 2002-02-11 2004-01-22 Moteurs Leroy-Somer Method and a machine for manufacturing a magnetic circuit for an electrical machine
US7103964B2 (en) 2002-02-11 2006-09-12 Moteurs Leroy-Somer Method of manufacturing a circuit for an electrical machine
CN111278582A (zh) * 2017-10-18 2020-06-12 Hsf自动化有限责任公司 用于冲口的设备及冲压系统
US20210187581A1 (en) * 2017-10-18 2021-06-24 Hsf Automation Gmbh Apparatus for notching, and punching system
US11786953B2 (en) * 2017-10-18 2023-10-17 Hsf Automation Gmbh Apparatus for notching, and punching system

Also Published As

Publication number Publication date
CH576298A5 (enExample) 1976-06-15
FR2242169B3 (enExample) 1977-06-17
SE411713B (sv) 1980-02-04
FR2242169A1 (enExample) 1975-03-28
SE7411256L (enExample) 1975-03-06

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Owner name: MASCHINENFABRIK MULLER-WEINGARTEN AKTIENGESELLSCHA

Free format text: CHANGE OF NAME;ASSIGNOR:MASCHINEN FABRIK WEINGARTEN AKTIENGESELLSCHAFT;REEL/FRAME:004074/0384

Effective date: 19821206