US3405880A - Method and apparatus for punching blanks from webs of sheetlike material - Google Patents

Method and apparatus for punching blanks from webs of sheetlike material Download PDF

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Publication number
US3405880A
US3405880A US591304A US59130466A US3405880A US 3405880 A US3405880 A US 3405880A US 591304 A US591304 A US 591304A US 59130466 A US59130466 A US 59130466A US 3405880 A US3405880 A US 3405880A
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US
United States
Prior art keywords
web
punching
blanks
marginal portion
width
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
US591304A
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English (en)
Inventor
Bielert Hans-Georg
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.)
STEPHAN WERKE GmbH AND Co
Original Assignee
STEPHAN WERKE GmbH AND Co
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Filing date
Publication date
Application filed by STEPHAN WERKE GmbH AND Co filed Critical STEPHAN WERKE GmbH AND Co
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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
    • 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
    • B21D28/06—Making more than one part out of the same blank; Scrapless working
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49078—Laminated
    • 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
    • Y10T83/04—Processes
    • Y10T83/05—With reorientation of tool between cuts
    • 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
    • Y10T83/04—Processes
    • Y10T83/0505—With reorientation of work between cuts
    • Y10T83/051—Relative to same tool
    • 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
    • Y10T83/889—Tool with either work holder or means to hold work supply
    • Y10T83/896—Rotatable wound package supply

Definitions

  • the present invention relates to a method and apparatus for punching blanks from webs of sheet-like material. More particularly, the invention relates to a method and appauatus which may be utilized to subdivide elongated webs of metallic material into laminations of the type used in dynamos. Still more particularly, the invention relates to a punching method and apparatus which may be utilized for economical conversion of relatively wide and relatively long webs of sheet stock into laminations or other types of blanks.
  • laminations for dynamos are formed by punching blanks out of rectangular sheets or bands.
  • the stock is advanced lengthwise past a punching station where a single set or several sets of cooperating punching dies form laminations during dwells between successive stepwise advances of the stock.
  • Such operation is rather uneconomical, not only because the originally produced sheet or band stock must be subdivided into widths which correspond to that of one or more laminations but also because the stock is not used up without waste in expensive material.
  • the provision of a battery of several sets of dies in a single punching apparatus contributes to the bulk, weight and initial cost so that such large apparatus are uneconomical, particularly in a medium-sized manufacturing plant. It was further found that the operation of conventional punching apparatus is uneconomical for the additional reason that the intervals between successive passes of sheet or band stock past the punching station are too long so that the output of such apparatus per unit of time is rather low.
  • Another object of the invention is to provide a method according to which the intervals between successive passes of web or sheet stock past one or more sets of punching dies may be reduced to a minimum without in any way afiecting the accuracy and/or economy of the punching operation.
  • a further object of the invention is to provide a method of the just outlined characteristics according to which a web of sheet stock can be subdivided into blanks without any waste or with a minimum of waste.
  • An additional object of the invention is to provide a method of mass-producing dynamo laminations or other types of blanks by repeatedly passing a web or strip past a punching station and in such a way that the component parts of the punching means are subjected to balanced stresses and undergo minimal wear.
  • Still another object of the instant invention is to provide a novel and improved punching apparatus which may be utilized in the practice of the above outlined method.
  • a further object of the invention is to provide the punching apparatus with novel web advancing and guiding means.
  • An additional object of the invention is to provide a "ice novel punching means which may be utilized in the above outlined apparatus.
  • Another object of the invention is to provide a punching apparatus which can operate practically continuously to subdivide into individual blanks a web or strip of sheet material despite the fact that the width of the original web is a multiple of the width of a blank and that the apparatus comprises only one or at most two sets of punching dies.
  • Still another object of the present invention is to provide a punching apparatus which can be readily converted for processing of wider or narrower webs consisting of metallic or other material, wherein at least some operations can be carried out in a fully automatic way, and which can be converted to produce blanks of different sizes or shapes.
  • one feature of the present invention resides in the provision of a method of punching blanks from elongated webs whose width is a multiple of the width of a blank, particularly for punching armature punchings or laminations from elongated sheets of metallic material.
  • the method comprises the steps of advancing an elongated web lengthwise along a predetermined path so that one end of the web is leading and that at least one marginal portion of the Web travels past a punching station, separating blanks from successive increments of the one marginal portion while such increments dwell at the punching station whereby the one marginal portion yields a series of blanks and is at least substantially consumed with resulting narrowing of the web, placing at least one marginal portion of the thus narrowed web into registry with the punching station, advancing the thus narrowed web lengthwise past the pundhing station, preferably in such a way that the other end of the web is leading but that the web advances in the same direction as the ori mal Web, and separating blanks from successive increments of the one marginal portion of the narrowed web.
  • the same steps can be repeated again and again, depending on the width of the original web and also whether or not the blanks are being separated from one or both marginal portions of the web.
  • That end of the web which is leading is preferably convoluted onto a reel in a region located downstream of the punching station.
  • the narrowed web can be moved sideways 'with reference to the punching station to place the latter into registry with one of its marginal portions, or the punching station can be moved transversely of the narrowed web.
  • FIG. 1 is a somewhat schematic side elevational view of a punching apparatus which embodies one form of the present invention
  • FIG. 2 is a somewhat schematic top plan view of the punching apparatus.
  • FIG. 3 is a schematic elevational view of a duplex punching unit which forms part of a modified punching apparatus.
  • a punching apparatus which comprises three basic components, namely a punching means 2 mounted on a substantially C-shaped frame member, 4a, composite guide means for guiding an elongated web 13 of metallic sheet stock lengthwise and including a pair of reels or spools 7, 8 rotatable about the axes of horizontal shafts 6 which extend at right angles to the direction of lengthwise movement of the web 13, and a feed including motors 30, pulleys 31 on the shafts 6, and endless belts 32.
  • the construction of the feed is such that the reel 7 can be driven independently of the reel 8, or vice versa.
  • the frame member 4a is mounted on a base plate 1 which further carries a second frame member or column 4 for inverting means including a two-armed lever whose arms carry the shafts 6 for the reels 7, 8.
  • the lever 5 is fulcrumed at 5a so that it can be rotated about a horizontal axis in order to change the positions of the reels 7 and 8.
  • the motors 30 are mounted on the lever 5.
  • the punching means 2 is constituted by a punching press of conventional design and includes upper and lower dies 3 one of which is reciprocable by a motor 33.
  • a transmission 34 serves to transmit motion from the output shaft of the motor 33 to the upper die 3.
  • the aforementioned guide means further includes a deflecting roller 11 which is mounted on a third frame member 10, and more particularly on a horizontal platform 35 which supports an intermediate portion of the web 13.
  • the roller 11 cooperates with a presser roll 11a.
  • a further portion of the web is supported by guide elements 36, 37 mounted on the frame member 4a.
  • the base plate 1 supports a control stand 12 which accommodates several control elements serving to operate various components of the apparatus in a predetermined sequence.
  • Each of the reels 7, 8 has two flanges 9 at least one of which is adjustable axially of the respective shaft 6 so that the edge faces of the Web 13 are accurately guided when the one or the other motor 30 is started in order to advance the web from the core of the reel 7 onto the core of the reel 8, or vice versa.
  • the reel 7 constitutes a supply reel and its core carries a supply of convoluted we-b stock whose width is a multiple of the width of a single blank.
  • the width of a blank corresponds to the width of one of the seven strips 14 shown in FIG. 2, each such strip being subdivisible into a series of discrete blanks in response to dwell of successive increments of the web 13 at the punching station, namely, in the gap between the dies 3 of the punching means 2.
  • the flanges 9 of the reels 7, 8 are adjusted in such a way that the distance between the flanges of the supply reel 7 equals the width of the web 13 and that the distance between the flanges of the reel 8 (which constitutes a takeup reel) equals the width of the web 18 minus the width of a strip 14.
  • Such adjustment of the flanges 9 insures that the web 13 is properly guided in respose to starting of the motor 30 for the takeup reel 8.
  • its upper marginal portion 14A (as viewed in FIG.
  • the web 13 advances past the punching means 2 whereby the dies 3 cooperate with each other and subdivide the marginal portion 14A into a series of discrete blanks, for example, into laminations usable in a dynamo. Such laminations are also called armature punchings.
  • the motor 30 for the takeup reel 8 is in operation, the web 13 advances along a first limit switch 15, along the guide element 36, across the gap between the dies 3, along the guide element 37, along a second limit switch 16, around the deflecting roller 11, along the platform 35, and is convoluted onto the core of the takeup reel 8 downstream of the punching station as considered in the direction of movement of the web.
  • the marginal portion 14A is used up, either substantially or in its entirety, so that the core of the takeup reel 8 collects a narrower web 13A.
  • the motor 30 for the reel 8 is arrested and the lever 5 is pivoted to move the empty reel 7 into the space previously occupied by the reel 8, i.e., the reel 7 becomes the takeup reel and the reel 8 becomes the supply reel.
  • the flanges 9 of both reels are adjusted so that the marginal portion 14B of the narrower web 13A is placed into registry with the punch- 4- ing station (gap between the dies 3) and the leading end of the web 13A is attached to the core of the reel 7.
  • the distance between the flanges of the reel 7 is reduced to that of the width of the web 13 minus the combined width of two strips 14.
  • these dies may separate from the marginal portion 14B a series of blanks so that the width of the leading end of the web 13A is reduced sufliciently to fit between the flanges 9 of the reel 7.
  • the operator then starts the motor 30 for the reel 7 (which is now the takeup reel) and the marginal portion 14A is subdivided into a second series of blanks.
  • the same procedure is carried a total of seven times because the original web 13 has a width corresponding to the combined width of seven blanks.
  • the web 13 or 13A invariably advances in the same direction, namely, as indicated in FIG. 1 by arrow 38.
  • the leading end of the web 13 becomes the trailing end of the narrower web 13A
  • the trailing end of the web 13A becomes the leading end of the still narrower web which is obtained in response to subdivision of the marginal portion 14B into a series of discrete blanks.
  • the apparatus of FIGS. 1 and 2 can be operated in a fully automatic way in accordance with a predetermined program.
  • the limit switches 15, 16 form part of the programming means and can be used to automatically arrest one of the motors 30, to arrest the motor 33 for the upper die 3, and/or to initiate or terminate certain other operations of the apparatus.
  • the apparatus may further comprise suitable servomotors (not shown) which can move the flanges 9 axially of the respective shafts 6 and one of such servomotors may be used to pivot the lever 5 in automatic response to completed winding of the web onto the core of the reel 7 or 8.
  • suitable servomotors not shown
  • the programming system comprises several additional control elements in the form of switches or the like which are not shown in the drawings.
  • FIG. 3 illustrates a portion of a modified punching apparatus.
  • This modified apparatus includes different punching means including two sets of punching dies 18 and 19 mounted symmetrically with reference to a vertical symmetry plane 40.
  • the web 13 is indicated by phantom lines and is advanced stepwise in a direction at right angles to the plane of FIG. 3.
  • the sets of dies 18 and 19 are movable or shiftable toward and away from each other in directions indicated by a double-headed arrow 41 so that they may simultaneously form two rows of blanks by subdividing both marginal portions of the Web 13.
  • the width of the web 13 is preferably n times the width of a blank wherein n is an odd number (for example, seven) so that, in response to repeated passage of the web 13 between the dies 18, 19, there remains a single strip 14 whose width equals the width of a single blank. This remaining strip 14 is then placed into registry with the dies 18 or 19 so that one set of dies is idle when the punching means is to form the last series of blanks.
  • Such selection of the width of the web 13 results in substantial savings in web material because the dies 18 and 19 cannot be placed into immediate proximity of each other and, therefore, some waste material would remain if the last pass of the web would take place while the width of the web would at least equal the combined width of two blanks.
  • the original width of the web 13 would be n times the width of a strip 14 plus a fraction of such unit width to account for the necessary minimum spacing between the dies 18 and 19.
  • the punching means of FIG. 3 has been found to be particularly useful in mass-production of dynamo laminations or analogous blanks.
  • the wear on its parts is less pronounced because the stresses upon the dies 18, 19 are symmetrical.
  • the numeral 17 denotes a gantry-like frame member for the dies 18, 19.
  • the motor 133 serves to eciprocate the upper dies 15, 19 through the intermediary of a transmission 134.
  • a method of punching blanks from elongated webs whose width is a multiple of the width of a blank comprising the steps of advancing an elongated web lengthwise along a predetermined path so that one end of the web is leading and that at least one marginal portion of the web travels past a punching station; separating blanks from successive increments of said one marginal portion while such increments dwell at said punching station whereby said one marginal portion yields a series of blanks and is at least substantially consumed with resulting narrowing of the web; placin at least one marginal portion of the thus narrowed web into registry with the punching station; advancing the thus narrowed web lengthwise past said punching station; and separating blanks from successive increments of said last named marginal portion.
  • step of placing at least one marginal portion of the narrowed web into registry with the punching station includes moving the narrowed web sideways with reference to the punching station.
  • step of placing at least one marginal portion of the narrowed web into registry with the punching station includes moving the punching station transversely of the narrowed web.
  • At least said first mentioned separating step includes separating blanks from successive increments of both marginal portions of the web and wherein said punching station is movable transversely of the web.
  • Apparatus for punching blanks from elongated webs whose width is a multiple of the width of a blank comprising punching means operative to separate blanks from a web; a feed for moving an elongated web lengthwise so that one end of the web is leading; and guide means for guiding the web in a predetermined path so that at least one marginal portion of the web moves past said punching means and the punching means separates blanks from successive increments of said one marginal portion while such increments register with said punching means whereby the one marginal portion yields a series of blanks and is at least substantially consumed with resulting narrowing of the web, at least one of said means being movable With reference to the other means in a direction transversely of said predetermined path so that at least one marginal portion of the thus narrowed web can be placed into registry with said punching means prior to movement of the narrowed web past said punching means to yield another series of blanks.
  • said guide means comprises a first reel for supporting the web in convoluted condition upstream of said punching means and a second reel for collecting the one end of the Web downstream of said punching means, as considered in the direction of lengthwise movement of the web.
  • said inverting means comprises a two-armed lever turnable about a fixed axis, each of said reels being rotatably supported by one arm of said lever.
  • each of said reels comprises at least one axially movable flange.
  • said punching means comprises two punching units each operative to separate blanks from one marginal portion of the web, said punching units being movable toward and away from each other in a direction transversely of said predetermined path.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Advancing Webs (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US591304A 1965-11-02 1966-11-01 Method and apparatus for punching blanks from webs of sheetlike material Expired - Lifetime US3405880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST024584 1965-11-02

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US3405880A true US3405880A (en) 1968-10-15

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US (1) US3405880A (en))
AT (1) AT268019B (en))
DE (1) DE1452917B2 (en))
GB (1) GB1114465A (en))
SE (1) SE327383B (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540120A (en) * 1968-11-12 1970-11-17 Westinghouse Electric Corp Method of constructing magnetic core structures
US4191040A (en) * 1977-11-07 1980-03-04 Dewey Herbert F Ferrule rolling machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US485485A (en) * 1892-11-01 brada
US1536027A (en) * 1922-02-01 1925-04-28 Charles W Mortimer Method of making shingle strips
US2224070A (en) * 1939-04-13 1940-12-03 Benjamin C Walter Tape cutting machine
US3113741A (en) * 1959-06-17 1963-12-10 Herr Equipment Corp Strip handling

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US485485A (en) * 1892-11-01 brada
US1536027A (en) * 1922-02-01 1925-04-28 Charles W Mortimer Method of making shingle strips
US2224070A (en) * 1939-04-13 1940-12-03 Benjamin C Walter Tape cutting machine
US3113741A (en) * 1959-06-17 1963-12-10 Herr Equipment Corp Strip handling

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540120A (en) * 1968-11-12 1970-11-17 Westinghouse Electric Corp Method of constructing magnetic core structures
US4191040A (en) * 1977-11-07 1980-03-04 Dewey Herbert F Ferrule rolling machine

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DE1452917A1 (de) 1969-03-27
GB1114465A (en) 1968-05-22
DE1452917B2 (de) 1972-03-16
SE327383B (en)) 1970-08-24
AT268019B (de) 1969-01-27

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