US3557598A - Electromagnetic feeding device - Google Patents

Electromagnetic feeding device Download PDF

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Publication number
US3557598A
US3557598A US804248A US3557598DA US3557598A US 3557598 A US3557598 A US 3557598A US 804248 A US804248 A US 804248A US 3557598D A US3557598D A US 3557598DA US 3557598 A US3557598 A US 3557598A
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Prior art keywords
chute
workpiece
workpieces
stator
ram
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Expired - Lifetime
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US804248A
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English (en)
Inventor
Cornelis Langewis
Arthur Dean Smith
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Kaiser Aluminum and Chemical Corp
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Kaiser Aluminum and Chemical Corp
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    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/18—Advancing work in relation to the stroke of the die or tool by means in pneumatic or magnetic engagement with the work

Definitions

  • the electromagnetic device includes a chutelike element and an electrically energizable stator means associated therewith which operates to generate and maintain an electromagnetic field relative to a metal workpiece disposed within the chute-like element in order to efiect advancement of the workpiece along the chutelike element to a position where it can be readily engaged by the ram of the press and thereafter advanced by the ram through one or more forming dies of the press.
  • This invention relates to an electromagnetic feeding device which, among other things, can be used in the feeding of cup-shaped blanks to a container fabricating machine. More particularly, it relates to an improved electromagnetic device or linear induction type motor for use in feeding cup-shaped metal blanks to a draw and iron container forming apparatus wherein a chute-like element operates in conjunction with an electrically energizable stator means in a unique fashion to advance a cup-shaped blank through the chute-like element and onto a ledge element where the workpiece becomes aligned with the forming ram as well as the dies of the draw and iron apparatus so that it can be engaged in the proper fashion by the ram during its forward stroke.
  • FIG. 1 is a fragmentary perspective view of the feeding device of the instant invention
  • FIG. 2 is another fragmentary perspective view on a reduced scale of the feeder device of the instant invention and illustrates further details thereof;
  • FIG. 3 is an end elevational view of the device of the instant invention.
  • FIG. 4 is a side elevational view generally taken along line 4-4 of FIG. 3 and with certain parts added and other parts broken away;
  • FIG. 5 is a schematic .view of a suitable electrical control circuit for the device of the instant invention.
  • the electromagnetic feeding device 10 in a preferred embodiment of the instant invention generally comprises a chute or chute-like element 12, a ledge or stop and centering element 14 disposed across the exit end of the chute-like element 12 and an electromagnetic stator 16 disposed adjacent the chute 12 between the ends thereof.
  • the inlet or upper end of chute 12 is supplied with successive metal workpieces W from a hopper or a conveyor, or the like not shown.
  • Chute opening 17 has an overall dimension whereby the workpieces W can pass freely in stacked relation from the inlet to the discharge end of the chute in the manner illustrated in FIGS. 1 and 3-4.
  • stator 16 is electrically connected to the stator 16 for selectively energizing stator 16 in order to generate and maintain a constant traveling electromagnetic field.
  • the magnetic lines of flux of this field are generally disposed at transverse angles to the normal path of movement of the workpieces W in the chute 12 adjacent stator 16 as generally indicated by the dotted lines 15 in FIG. 1.
  • container forming apparatus 22 with which feeding device of the instant invention can be used need be only briefly described. It generally comprises a reciprocating forming ram 20 and a series of draw and iron dies with only drawing die 28 being illustrated and the dies are arranged in the usual tool pack 30.
  • This draw and iron apparatus 22 can, for example, be of a type shown in the aforementioned Pat. 3,314,274 of Langewis, issued Apr. 18, 1967, except that drawing die 28 illustrated herein is a straight drawing die instead of the reverse redraw die of the said patent.
  • Ram 20 is disposed for slidable movement within the bore 32 defined by the cylindrical sleeve 34, which is disposed in the barrel 36 of apparatus 22.
  • the forming end of ram 20 can be slidably disposed within a bearing and guide sleeve 38 fixed in a conventional manner to the forward end of sleeve 34.
  • the forward end of sleeve 34 extends beyond the forward flanged end of barrel 36 of apparatus 22 in the manner illustrated in FIG. 4 and is closed ofi by an apertured closure member 40 attached to the outer face of the forward flanged end of barrel 36 by the usual cap screw assemblies generally indicated at 42 in FIG. 3.
  • ram 20 is reciprocated by a suitable fluid actuator back and forth through tool pack 30 and the forward flanged end of barrel 36 in effecting the drawing and ironing of workpieces W as they are successively deposited on stop 14.
  • a suitable fluid actuator back and forth through tool pack 30 and the forward flanged end of barrel 36 in effecting the drawing and ironing of workpieces W as they are successively deposited on stop 14.
  • stator 16 assures that the endmost workpiece W of a given stack of workpieces W will be properly seated against stop 14 prior to each forward stroke of ram 20 so that this endmost workpiece can be picked off of ledge 14 and properly advanced by ram 20 through tool pack 30.
  • chute 12 When chute 12 is disposed in a vertical or the usual position in the manner shown in FIGS. l-4, gravity also assists stator 16, when energized, to seat the endmost workpiece W against stop 14.
  • chute 12 can be disposed in any desired position and if, during use, the inlet end of chute 12 faces downwardly the workpieces W within chute opening 17 will tend to drop out from the inlet end of chute 12 due to the influence of gravity.
  • the intensity of the electromagnetic field of stator 16 can be regulated by circuit 18, as will be subsequently described, to compensate for the adverse effect due to the influence of gravity.
  • Chute 12 can be constructed so as to be partially open and provide optimum visual inspection of the workpieces W passing therethrough.
  • the various front and back wall portions at the exit end of chute-like element 12 are partially cut away to define an overall transverse opening 26 adjacent stop block 14 and opening 26 in effect is a continuation of opening 17.
  • a front sidewall portion of chute 12 can be advantageously hingedly connected to another portion of chute 12 to provide quick access for servicing the interior thereof.
  • An auxiliary arresting device 24 is disposed adjacent the exit end of chute 12 and functions to selectively arrest advancement of the workpieces W when the chute device is not in use.
  • the workpieces W are preferably of cup shape and of at least an electrically conductive metal material such as aluminum or an alloy thereof whereby the traveling magnetic lines of flux in field generated by stator 16 can induce eddy currents in the workpieces W in chute 12.
  • stator 16 reacts to the repetitive and downwardly moving overall electromagnetic field 15 produced by stator 16 to produce a propulsion of a given workpiece toward the discharge end of chute 12 in the same general fashion as the rotor currents in a polyphase induction motor react to the revolving flux produced by the motor stator to produce rotation of the rotor.
  • Chute 12 is preferably made up of a suitable plastic material such as a suitable grade of polyurethane that can withstand the temperature and abuse the chute would be subjected to in feeding workpieces therethrough.
  • a suitable plastic material such as a suitable grade of polyurethane that can withstand the temperature and abuse the chute would be subjected to in feeding workpieces therethrough.
  • the chute is electrically non-conductive as well as impermeable to the magnetic lines of flux generated by stator 16.
  • One of the advantages of the chute being constructed of a plastic material is that it minimizes the power requirements for stator 16 to establish and maintain a repetitive magnetic field 15 of sufficient strength for propelling workpieces through the chute, thereby increasing the overall efficiency thereof.
  • Bracket 54 is adjustably affixed to the top of the forward flanged end of barrel 36 by passing a series of cap screw assemblies 56 through slotted openings 59 in the web portion 60 of bracket 54 in a known manner.
  • the upstanding legs 58 of bracket 54 at their forward edges are beveled in an upward and rearward direction relative to the forward edge of web 60.
  • a back plate 62 is connected to and rests on web 60 as well as bridging the space between and being connected to legs 58.
  • bracket 64 is adjustably connected at one end to the outwardly facing side of backplate 62 by way of a series of slotted openings 66 in plate 62 which receive a series of cap screw assemblies 68.
  • the back edge of web 60 of bracket 54 can be extended to underlie the lower flange 70 of bracket 64 to provide additional support for the same and flange 70 of bracket 64 can be adjustably connected to the underlying rearward extension of web 60 by cap screw and slotted opening assemblies 71.
  • Chute 12 includes top 48 and lower plates 50 and 52 as well as pairs of rods 44 and 46.
  • a strap element 74 of U-shaped configuration is used to aflix the two pairs of rods 44 and 46 to certain portions of brackets 54 and 64 and it is made up of a pair of leg elements 76 and 78 interconnected by a web 80 of channel shape.
  • the outer free end of leg 76 is flanged laterally outward to facilitate connection to one of the upstanding legs 58 of bracket 54 by a cap screw assembly 80'.
  • Leg 78 of strap 74 is provided with a series of openings 82 for receiving Allenhead cap screw assemblies 84 used to anchor leg 78 to the backside of web 65 of bracket 64.
  • Rods 44 which form a sidewall of the chute 12 extend substantially the full length thereof and these rods are weldably afiixed at intermediate portions thereof to the inwardly facing surface portions of leg 78.
  • Rods 46 which are of a somewhat shorter length than rods 44, are weldably affixed at their lower ends to the inwardly facing portions of leg 76 in opposition to rods 44 and these rods 46 form a section of the front sidewall of chute 12.
  • the upper end of plate 50 is interposed between legs 76 and 7 8 of strip element 74 and is weldably connected thereto to form the lower section of the front Wall of chute 12.
  • the upper flanged end of plate 52 is adjustably connected by appropriate cap screw assemblies 86 to the undersurface of the web of bracket 54 adjacent upstanding leg 58 thereof to which leg 76 of strap element 74 is attached.
  • the main body portion of plate 52 is generally aligned with the inner leg 58 of bracket 54 so as to, in effect, form a continuation thereof whereby this leg and plate 52 form the lower section of the rear wall of chute 12 while plate 48 forms the upper part of the rear wall.
  • the lower flanged end of a support plate 88 rests upon and is affixed to flange 72 ot' bracket 64 by means of cap screws 92 that pass through slotted openings 93 in flanged end 90. In aflixiug support plate 88 to bracket '64, a slight clearance is allowed between plate 88 and the pair of rods 44 forming the rear sidewall of chute 12.
  • Plate 88 supports and is connected to stator 16 by way of cap screws 96.
  • Plate 48 connected to plate 88 in opposition to stator 16 by suitable means (not shown) forms the upper part of the rear wall of chute 12.
  • Stator 16 is of such a length that its lower edge is normally disposed and spaced above the top of U-shaped strap element 74.
  • a pair of relatively short and parallel spaced rods 98 are affixed to the top of channel-shaped element 80 of strap 74 so as to bridge this space whereby these rods 98 in effect form a chute wall connection between plate 50 and stator 16.
  • rods 44 and 46 can extend above the tops of stator 16and plates 48 and '88 and be flared in an upward and outward curvilinear direction all as shown in FIGS. 3-4.
  • a sharp element 98 can be clampingly affixed to the protruding portions of rods 44 and 46 so as to reinforce the same.
  • upwardly and outwardly flared plate sections 100 can be affixed to strap element 98 so as to form extensions of the upper edges of stator 16 and plate 48.
  • chute 12 The discharge or lower end of chute 12 is closed off by the roughly V-shaped centering and stop or ledge element 14 provided with a bottom 104 and upwardly diverging sides 106.
  • Ledge element is primarily attached by cap screws 102 to closure member 40 at the forward flanged end of barrel 36 of forming apparatus 22.
  • the lower ends of rods 44 can be advantageously seated in suitable openings on one side of stop 14 in the manner illustrated in FIG. 3.
  • the shallow V-shaped groove of ledge 14 extends across the discharge end of the chute and is aligned with the opening of drawing die 28 in tool pack 38 and forming ram of press 22.
  • the lower edges 10 8 of plates 50 and 52 are cut away to define the top part of opening 26 of the chute while ledge elements 14 forms the bottom of the opening.
  • Rods 44 close olf one side of opening 26 while a hingedly connection sidewall access door 110 comprised of a pair of parallel spaced rods 112 and upper and lower rod connected blocks 114 and 116 closes off the other sidewall of opening 20.
  • a vertically extending groove 118 in ledge 14 is bridged by a pin 120 which fits within L- shaped slot 122 in block 116 for effecting pivotal connection of the block 116 to stop 14, and in turn the overall sidewall 110 to chute 12.
  • Upper rod block 114 is provided with a latch finger 124 for slidably engaging leg 76 of strap 74.
  • the wall section or door 110 is installed simply by locating pin 120 in ledge element 14 in slot 122 of block 116 and then lifting wall section 110 upwardly until finger 124 can slide over strap 74. Removal of wall section 110 is effected by raising wall section 110 upwardly until finger 124 clears strap 7-4. Wall 110 is then pivoted outwardly and pin 120 disengaged from slot 122.
  • the elongated stator plate 126 made from an appropriate magnetically permeable material is provided with a series of uniformly and parallel spaced transversely extending slots or grooves 12%, certain ones of which are indicated in FIGS. 1 and 4. Grooves 128 are adapted to 6 receive the electromagnetic field coils 136 that form part of control circuit 18.
  • the control circuit 18 which represents one form of a suitable circuit that may be used with the device of the instant invention is generally comprised of three interconnected conductor leads 130, 132, 134 connected at their terminal ends to a suitable 3-phase, 60-cycle AC source, not shown. Electromagnetic induction coils 136 are series connected to the other terminal ends of conductor leads 130, 132 and 134 and to each other at a common point 135. A solenoid operated switching device 144 is connected across leads 130, 132 and 134 for effecting energization of coils 136. To this end, a branch line 138 is connected across lines 132 and 134. A normally open, manually operated switch 142 and solenoid 144 are series connected to line 132.
  • Solenoid 144 controls three relatively spaced, normally open con tact switches 146 across lines 130, 132 and 134 in the manner shown in FIG. 5. Closing of switch 142 will energize solenoid 144 and effect closing of switches 146 thereby energizing each pair of the three pairs of coils 136 series connected to their associated leads 130, 132 and -.134.
  • a 'variable rheostat element 148 can be series connected to these leads as illustrated in FIG. 5
  • a common control rod 150 connected to each one of three rheostats 148 can be used to simultaneously control all rheostats 148 and provide uniform regulation of the current flow in each of the leads 130, 132 and 134.
  • Each one of the coils 136 of the three pairs of coils are selectively and individually located in a groove 128 of the stator 16 in a well known manner.
  • one coil 136 for lead is placed in the topmost groove 128 of stator 16
  • one coil 136 for lead 132 is placed in the second or next stator groove from the top of stator 16
  • one coil 136 for lead 134 is placed in the third groove from the top.
  • the remaining coils 136 for each lead 130, 132 and 134 are respectively placed in the fourth, fifth andl sixth grooves from the top of stator 16, all as indicated in FIGS. 1 and 3.
  • Each coil 136 is anchored in its respective groove 128 by a suitable epoxy resinous material 150.
  • a suitable epoxy resinous material 150 is anchored in its respective groove 128 by a suitable epoxy resinous material 150.
  • the top side of plate 126 can be covered by a thin sheet of relatively electrically resistive material for the purpose of protecting coils 136 disposed in epoxy-filled grooves 128. Since the plate is constructed of relatively electrically resistive material, it does not adversely affect the generation and maintenance of the lines ofr flux in electromagnetic field 15 across opening 17 of chute 12 upon electrical energization of coils 136 of stator :16.
  • magnetic field 15 is illustrated in FIGS. 1 and 3 as being of a size corresponding to the overall cross-section dimension of one and a half workpieces W
  • a field having a size comparable to the overall crosssectional dimensions of six to seven workpieces W placed edge to edge can be used to propel workpieces W downwardly and an endmost workpiece into engagement against stop 14.
  • raised ribs can be provided on the inside surfaces of plate 50 and stator 16 in order to minimize frictional contact of the bottom of cup-shaped workpieces W with these elements during travel of the workpieces through chute 12.
  • the cup-shaped workpieces fed into chute 12 are preferably arranged therein such that the bottoms of the workpieces face the stator 16 so that the desired Workpiece eddy currents can be rapidly generated and maintained in the workpieces.
  • the downward propulsion forces given to each workpiece W advantageously act to urge each workpiece against an adjacent workpiece so that each workpiece will be forced tightly against an adjacent workpiece and thus produce a relatively uninterrupted and rapid flow of workpieces to ledge 14.
  • Plate 48 can be constructed of a suitable grade of steel or other material for the purpose of causing the magnetic lines of flux of field repetitively generated by stator 16 to be substantially and uniformly directed across opening 17 of chute 12 while at the same time minimizing the electrical power requirements for stator 16, thus increasing the overall efficiency thereof.
  • a suitable cooling device not shown, can be disposed adjacent the inlet of device 10 to minimize the heating of the stator 16 and the workpieces W due to the induced eddy currents in the workpieces W.
  • the auxiliary arresting device 24 referred to above for holding the stacked cup-shaped workpiece in chute 12 when it is not in operation is comprised of a fluid actuator 152 and a pivoted arresting arm 154 that is movable in between rods 44 and against one of the workpieces W.
  • a bracket 156 is used to support actuator 152 and arm '154 and bracket 156 includes upstanding legs 158 and 160 and a depending leg 162 for mounting the bracket on the forward flanged end of barrel 36 of the press.
  • Arm 154 is pivotally connected at 166 to upstanding leg 160 or bracket 156 while the cylinder of actuator 152 is pivotally connected at 168 to the upper end of upstanding leg 158.
  • piston rod sub-assembly 170 of actuator 152 is pivotally connected to arm 154 at 172.
  • the actuator cylinder contains a spring for biasing the piston rod sub-assembly 170 and arm 154 to their respective retracted positions.
  • the piston side of the piston rod sub-assembly is appropriately connected to the usual source of fluid for actuating piston rod sub-assembly 170 to the right, as viewed in FIG. 3, and for pivotally advancing arm 154 in a counterclockwise direction and into engagement with the next-to-the-bottomrnost workpiece W in chute 12.
  • Arresting device 24 can be used to stop the flow of workpieces W to ledge element 14 at any time such as when it is desired to idly stroke ram to and through tool pack or during the times that press 22 is inoperative.
  • stator 16 and plate 48 be reversed relative to plate 88.
  • the instant feeding device is efiicient and reliable in advancing a series of cup-shaped metal workpieces W rapidly, continuously and successively toward ledge 14 and to a position on the ledge where the workpiece is accurately aligned both with ram and dies of press 22.
  • the instant device because of its relative lack of moving parts is substantially jam-proof. By minimizing physical contact with the workpieces W during feeding of the same to ledge 14, denting and surface marring of the workpiece, which could deleteriously affect the drawing and ironing 0f the workpiece, is obviated.
  • the intensity of magnetic field 15 can be precisely controlled whereby workpieces W will always move at the proper rate through chute 12 in accordance with operating strokes of ram 20 of press 22.
  • a workpiece feeder device for said press, said feeder device comprising a chute-like means for receiving workpieces at one end thereof and for discharging the workpieces at another end thereof, the discharge end of said chute-like means being disposed adjacent the die means of the press, a workpiece receiving means located adjacent the entry end of said die means and the discharge end of said chute-like means for receivr ing a workpiece discharged from said chute-like means and for orienting and centering the workpiece relative to said die means and ram, an electrically energizable stator means for generating and maintaining a traveling electromagnetic field in the path of travel of the workpiece in said chute means and for effecting travel of said field toward the workpiece receiving means so as to continuously propel a workpiece within said chute-like means towards and into light pressing engagement with said workpiece receiving means whence the workpiece can be removed by
  • chute-like means includes hingedly connected sidewall means providing access to the interior thereof.
  • a device for feeding metal cup-shaped workpieces to said press comprising a chute-like means for receiving a cupshaped workpiece at one end and for discharging the workpiece at another end thereof, a combination workpiece stop and centering element located adjacent said die means and the discharge end of said chute-like means for receiving and orienting the workpiece relative to said die means and ram, the improvement comprising an electrically energizable stator means for generating and maintaining a traveling electromagnetic field in the path of travel of the workpiece in said chute means and for effecting movements of said field toward the workpiece receiving means so as to propel a workpiece through said chute-like means into light pressing engagement with said workpiece receiving means whence the workpiece can be removed by the ram upon the forward advancement thereof past said workpiece receiving means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
US804248A 1969-03-04 1969-03-04 Electromagnetic feeding device Expired - Lifetime US3557598A (en)

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US80424869A 1969-03-04 1969-03-04

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US (1) US3557598A (fr)
BE (1) BE746771A (fr)
CH (1) CH511076A (fr)
DE (1) DE2009598A1 (fr)
FR (1) FR2034635A7 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257523A (en) * 1990-09-07 1993-11-02 Coors Brewing Company Can body maker with magnetic ram bearing and redraw actuator
US5566567A (en) * 1995-04-25 1996-10-22 Sequa Corporation Rotary cup infeed
DE10135876A1 (de) * 2001-07-24 2003-02-20 Bueltmann Gmbh Verfahren und Vorrichtung zum Aufbringen von Druck- und/oder Zugkräften auf im wesentlichen stabförmige Werkstücke aus elektrisch leitfähigem und/oder magnetisierbarem Material
US20060101375A1 (en) * 2001-07-27 2006-05-11 Thomas Loughlin Device configuration and management development system
CN101879561A (zh) * 2010-07-16 2010-11-10 陈石云 冲压加工用的片料毛坯送料设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325910C1 (de) * 1983-07-19 1984-11-08 Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt Vorrichtung zum Speichern und Zuführen von Werkstücken
DE3918302A1 (de) * 1989-06-05 1990-12-06 Schuler Gmbh L Einrichtung zum positionieren von blechen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257523A (en) * 1990-09-07 1993-11-02 Coors Brewing Company Can body maker with magnetic ram bearing and redraw actuator
US5566567A (en) * 1995-04-25 1996-10-22 Sequa Corporation Rotary cup infeed
WO1996033825A1 (fr) * 1995-04-25 1996-10-31 Sequa Corporation Perfectionnement d'un dispositif d'alimentation rotatif en coupelles
CN1060693C (zh) * 1995-04-25 2001-01-17 西卡公司 加工杯形圆边件的装置
DE10135876A1 (de) * 2001-07-24 2003-02-20 Bueltmann Gmbh Verfahren und Vorrichtung zum Aufbringen von Druck- und/oder Zugkräften auf im wesentlichen stabförmige Werkstücke aus elektrisch leitfähigem und/oder magnetisierbarem Material
DE10135876C2 (de) * 2001-07-24 2003-11-13 Bueltmann Gmbh Verfahren und Vorrichtung zum Aufbringen von Druck- und/oder Zugkräften auf im wesentlichen stabförmige Werkstücke aus elektrisch leitfähigem und/oder magnetisierbarem Material
US20050022571A1 (en) * 2001-07-24 2005-02-03 Peter Bilstein Method and device for applying compressive and/or tractional forces to essentially rod-shaped workpieces consisting of electroconductive and/or magnetisable material
US20060101375A1 (en) * 2001-07-27 2006-05-11 Thomas Loughlin Device configuration and management development system
US7467372B2 (en) 2001-07-27 2008-12-16 Virtual Access Technology Limited Device configuration and management development system
CN101879561A (zh) * 2010-07-16 2010-11-10 陈石云 冲压加工用的片料毛坯送料设备
CN101879561B (zh) * 2010-07-16 2012-01-11 陈石云 冲压加工用的片料毛坯送料设备

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Publication number Publication date
DE2009598A1 (de) 1970-11-12
FR2034635A7 (fr) 1970-12-11
BE746771A (fr) 1970-08-17
CH511076A (de) 1971-08-15

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