US3608622A - Machine for moulding under pressure metal connecting members of rotors of electric motors - Google Patents

Machine for moulding under pressure metal connecting members of rotors of electric motors Download PDF

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Publication number
US3608622A
US3608622A US789191A US3608622DA US3608622A US 3608622 A US3608622 A US 3608622A US 789191 A US789191 A US 789191A US 3608622D A US3608622D A US 3608622DA US 3608622 A US3608622 A US 3608622A
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United States
Prior art keywords
machine
stack
carrier member
sleeve
jack
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Expired - Lifetime
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US789191A
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English (en)
Inventor
Rene Georges Bachelier
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Corpet Louvet et Cie
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Corpet Louvet et Cie
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/24—Accessories for locating and holding cores or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure

Definitions

  • the invention provides a machine for moulding under pressure short-circuiting bars and rings of rotors of electric motors formed initially from a stack of magnetic sheets formed with connecting apertures, the machine having a rotatable carrier member fitted with two diametrically opposed sleeves each adapted to receive a stack of sheets, rotation of the carrier member repeatedly through 180 presenting one sleeve to a feed hopper for the stacks and the other to a pair of opposed moulding dies which, when pressed against the end faces of the sleeve, form with the sleeve a complete mould into which is injected under pressure liquid metal which passes into and through the connecting apertures in the stack and into recesses in the dies to form rings on the end faces of the stack continuing from the apertures to form
  • FIG.1 A first figure.
  • the present invention relates to a pressure-casting machine particularly, although not exclusively, for use in making rotors for squirrel cage electric motors.
  • magnetic sheets having notches are stacked on a temporary spindle in a number determined according to the desired height of the rotor, the stacking being effected in such a manner that the notches formed in the sheets form inner tunnels leading to each lateral face of the rotor.
  • a second step the stack of sheets thus formed is placed manually in a conventional pressure-casting machine, following which, by injection of molten metal, there is formed on the lateral faces short circuiting rings possibly having cooling fins, these rings are connected together by bars formed in the tunnels.
  • the rotor and sprues which are attached thereto are extracted from the machine, again manually.
  • the rotor thus obtained is then placed in a press arranged on the one hand to effect the cutting off of the above-mentioned sprues and on the other hand to ensure the extraction of the temporary spindle.
  • the manufacturing technique has disadvantages which are: slow production, particularly due to various handling operations; the use of two machines, respectively a pressure-casting machine and an auxiliary cutting press; inefficient use of the pressure-casting machine due to time wastage; the impossibility of forming a feed head on the lower part of the rotor which often leads to a defective quality of he cast metal; and finally the necessity to create a mold for each kind of rotor.
  • the present invention has for an object to eliminate these disadvantages and to this end provides a machine of simple and robust construction having numerous advantages compared with the manufacturing techniques known hitherto.
  • a machine for casting under pressure metal connecting members of rotors of electric motors formed initially from a stack of magnetic sheets having connecting apertures said machine comprising a rotatable carrier member adapted to embrace at least two sleeves each adapted to receive in succession a stack of sheets, means for intermittently rotating said carrier member through a given angle to carry each of said sleeves in succession firstly to a combined feed and delivery station at which a stack of sheets is inserted into the sleeve, then to a casting station where the sleeve is positioned between a pair of opposed molds formed with casting recesses shaped to correspond with the arrangement of the connecting apertures in the end faces of the stack of sheets, means at the casting station for pressing the pair of molds respectively into engagement with the end faces of the sleeve, means at the casting station for injecting liquid metal under pressure into an injection passage communicating with the casting recess in one of said molds to cause the metal to flow into said recesses and connecting apertures to form with the stack of sheets an assembled rotor
  • the sleeves on the one hand and the dies on the other hand in combination constituting a mold can be very easily replaced according to the requirements of the moment, by elements having the same function but of different dimensions and shapes.
  • FIG. 1 illustrates in perspective a rotor for an electric motor having bars and short-circuiting rings produced by the machine according to the invention
  • FIG. 2 shows a plan view of this machine
  • FIG. 3 shows a corresponding elevation
  • FIG. 4 shows a side view of he machine
  • FIG. 5 shows the metal injection station in section along the line V-Y of FIG. 3;
  • FIG. 6 is a section along the line Y I V l of FIG. 5, the rotor stacks and the feed chute and delivery device not being shown;
  • FIG. 7 is a section along the line VII-VII of FIG. 2;
  • FIG. 8 is a view along the line VIIIVIII of FIG. 2; showing the feed station;
  • FIG. 9 shows on a larger scale a sectional view along the line IX-IX of FIG. 2;
  • FIG. 10 is a transverse section of the machine along the line XX of FIG. 2;
  • FIGS. 11 to 17 show schematically one cycle of operation of operation of the machine
  • FIGS. 18 to 24 are similar views of the operation of an alternative embodiment.
  • the rotor R constituted in the usual manner by a stack of magnetic metal sheets 5, has a central bore 6 for a temporary spindle or axle 7.
  • the sheets, perforated at 8, are stacked in such a manner as to constitute passages or tunnels which, when filled with molten metal, constitute bars shown diagrammatically at B connected together on the lateral faces of the rotor by circular short circuiting rings 9 and 10 which may possibly have cooling fins.
  • the machine for making rotors for electric motors or other similar articles has a base frame indicated generally at 12 of generally parallelepipedic form.
  • this frame On its upper surface which forms a table 13, this frame has two fixed supports 14 and 15 joined together by spacing bars, of which three are shown at 16, 16a, 16b. Between the fixed supports, the aforesaid bars carry a movable plate 17 coupled to a fixed hydraulic jack 18 whilst, between this movable plate and the fixed support 14, the bar 16b carries and forms a rotational journal for a revolving sleeve-carrying plate 19, having two diametrically opposed bores 20, 21 (FIG. 5) each having a sleeve 22, 23 for carrying a rotor stack.
  • a block 25 which receives a die 26 is fixed by screws 24 to the fixed support 14.
  • This die has, facing the revolving plate 19, a central hole adapted to house one end ofthe temporary spindle 7, and a circular groove 27 adapted to communicate by one or more channels 28 with an inlet cylinder 29 having an injection orifice E.
  • a piston 30 movable in the injection cylinder 29 constitutes the end part of a hydraulic injection jack indicated by VI.
  • the movable plate 17 has a block 31 arranged to carry a second die 32 substantially similar to the aforesaid one, i.e. having a central blind hole 33 for the head of the temporary spindle and a circular groove 34.
  • a casting device formed from three parts which are respectively a sleeve 22 or 23 which receives the stacks of sheet metal, a first fixed die 26 located at the injection side, and second die 32 which is movable under the action of the jack l8 fixed rigidly to the frame and is adapted to ensure the closing of the mold.
  • the above mold is provided with, for example, two sets of dies and two corresponding sleeves. It will be understood that for removing the finished rotors and placing in position new stacks of sheets, the opposing jacks will be appropriately arranged.
  • the sleeve-carrying plate 19 is, on the one hand, reciprocally movable in a direction parallel to the bars 16, 16a and 16b and is adapted on the other hand for alternate rotational swings through 180.
  • the sleeve-carrying plate 19 is provided axially, for the purpose of driving it in rotation, on its face remote from the injection, with a sleeve 38 at the end of which is fixed in any suitable manner a pinion 39 adapted to cooperate with a vertical rack 40 controlled by a jack 41.
  • the sleeve-carrying plate 19 can thus be rotated in either direction of rotation; it is moreover axially displaceable as indicated by the arrow F in FIGS. 2 and 5.
  • the plate is mounted on ball bearings 42 and connected to a jack 43 carried by the fixed plate 14 through a sliding assembly shown generally at 44.
  • This assembly comprises a T-shaped component 45 of which the ends of the horizontal portion 46 are immovably held between abutment faces 47 housed in a cylindrical extension 48 of the injection sideplate 19. This portion is movable in a hole 49 fonned in the bar 16b, while the other portion 50 of the T is connected by a pin 51 to the rod 52 of a piston 53 of the aforesaid jack 43.
  • the block 31 carrying the die 32 has, adjacent to its outer edge a threaded hole 54 adapted to receive a stay rod 55 and a counter nut 56. At its free end, this rod had a head 57 adapted to cooperate with a housing 59 formed in the plate 19; it will be noted that this rod is axially adjustable and can enter a hole 60 provided in the movable plate 17.
  • the plate 19 (FIG. 2) holds the other sleeve 22 as shown in the axis of a first jack 61 located at the injection side of the plate, and of a coaxial second opposing jack 62, the first jack having a rod 63 (FIG. 7) while the rod 64 of the second jack is hollow and operable in either direction along its axis.
  • the jack 6 is provided, at the end portion of its rod 63, with a removable rod extension 65, the diameter D of which is slightly less than the diameter of the bore 6 formed in the rotor.
  • the jack 62 is adapted to actuate a retractable stop device which essentially comprises a lever 66 rockably mounted at 67 on a yoke, itself fixed on one of the fixing stocks 69 of the jack 62.
  • the lever 66 extends parallel to the jack 62 and has, at one end located near the sleeve-carrying plate 19, an extension 70 acting as a stop directed towards the table 13 of the frame.
  • the lever 66 is subjected to the action of a spring 72 connected to the table 13. Adjacent this end, the lever 66 is provided with a roller 76 rotatable on a shaft 77 which roller is adapted to cooperate with the end portion of the hollow rod 64 of the jack 62.
  • a limiter is provided in the form of a bridge 78 associated with the end stock 69.
  • a channel 80 for the reception of assembled rotors R leads to a location between the sleeve carrying plate 19 and the far end of the jack 62, which rotors are directed by means of the inclined chute 81 towards an appropriate receptacle (not shown), while an inclined channel 82, formed in the table, substantially beneath the yoke 68, is adapted to receive and direct the temporary spindle 7 towards a receiving location each mounted on temporary spindles as shown in FIG. 10.
  • a supply station A (FIGS. 2 and 4).
  • This station comprises in a feed shoot 85 a device 86 arranged to deliver stacks of sheets one by one onto a reception assembly indicated generally at B comprising two elements respectively 87 and 88.
  • the first element 87 is fixed to a bedplate 89 and the second is movable as shown by the arrow F2 in a direction which is transverse with respect to the frame.
  • the elements 87, 88 have opposed inclined surfaces 90, 91 downwardly converging and which thus form a reception V.
  • the element 88 has a threaded hole 92 for receiving a screw 93 rotatable by means of 5 wheel 94 carried by a bearing 95 itself fixed to the bedplate 89.
  • This bedplate 89 is slidably mounted by means of a slide on an intermediate element 96 connected to a plate 97 which is itself movable in a direction perpendicular to the aforesaid direction by means of slideways 98 fixed to the frame.
  • Transverse movement of the bedplate 89 and of the assembly B is effected by a jack 100 which is coupled to a lug 101 of the bedplate, this jack being rigidly connected to the movable plate 97.
  • the plate 97 has a threaded sleeve 102 in which is engaged a screw 103 operable by a wheel 104 rotating in a bearing 105 fixed laterally to the frame of the machine.
  • the temporary spindle 6 of these rotors must be presented in the alignment of the rods 63 and 64 respectively of the pistons 61 and 62, the common axis of which corresponds to the position indicated at 106.
  • the wheel 94 it is possible, by simple operation of the wheel 94, to alter the spacing of the inclined faces 90 and 91 according to the diameters of the rotors R, in such a manner that the axis of the latter has the same length as that of the aforesaid axis 106, whereas manipulation of he wheel 104 enables the longitudinal positioning of the rotors to be altered according to their length to adapt the device to rotors of various lengths.
  • the jack 100 is adapted to position the stacks of sheets along the aforesaid axis.
  • the jack 43 is fed and its piston 55 (see FIG. 13), moving in the direction of the arrow F3, drives the revolving plate 19 against the fixed due 26, following which the jack 18 is pressurized and this drives the movable die 32 firmly into contact with the corresponding face of the sleeve 23.
  • the lateral faces of the stack of sheets R1 close on the circular grooves 27 and 34 themselves in communication by means of the tunnels formed by the perforations 8 aligned, for example, helically, the die 26 being in communication by the channel 28 with the injection chamber 29.
  • the jacks 61 and 62 have been placed under pressure and the forward ends of the rod 64 and 63 have come into contact with the corresponding lateral faces of the assembled rotor R.
  • the rod 64 is provided to come into contact with the lateral face of the rotor, while the rod extension portion 65 of the rod 63, by penetrating into the bore 6 of the rotor pushes back the temporary spindle 7 into the tubular rod 64, the temporary spindles previously removed being also pushed back ensuring the ejection of the last of these into the channel 82.
  • liquid metal is injected into the rotor by operating the injection jack Vl, the piston 30 of which ensures the introduction of molten metal under pressure into the aforesaid circular grooves and tunnels 27, 34 and 8 to form the connecting bars B and rings 9 and 10.
  • the jack 61 has a thrust greater than that of the jack 62, and this being so, it pushes back the rod 64 of the latter at the same time carrying with it the rotor R which is still nipped between the two rods; it is thus first extracted from fixed sleeve 22 and then dropped straight down into the discharge channel 80.
  • the thrust of the jack 61 has, during the extraction of the rotor R from the chuck, caused the rupture of the sprue C which is shown still attached to the plate 19; moreover, the stop device 70 has been brought by the tubular rod 64 into its operative position between the sleeve 22 and the rear face of the rotor R being ejected, in order to prevent rearward movement of the rotor R' when the rod 63 of the jack 61 is moved rearwardly as is shown in FIG. 14.
  • the jack 62 is still in its rearward position, while the jack 61 is with respect to the previous phase itself brought back to its starting position, so that the freed rotor R falls into the channel 80, where it slides under gravity towards a receptacle (not shown).
  • the feed station A has delivered a stack of sheets R2 so that the latter is located first in the reception V and then aligned with the axis 106 of the opposed jacks 61 and 62, as will be seen from FIG. 16, the jack 62 is again pressurized and its rod 64 pushes the stack of sheets R2 into the sleeve 22, the sprue C, if still there, being then removed from the plate 19.
  • Such a machine enables the manufacture of rotors of various types.
  • a series of rotors of a certain type having been completed, rotors of another type can be rapidly casted by changing the dies and the sleeves in that their mounting and dismounting on their respective supports is easily effected.
  • the same references have been used to designate similar elements; the sleeve-carrying plate 19 is the same as before, as are the casting and supply stations M and A respectively.
  • the jack 62 is replaced by a jack having a simple tubular rod 111 adapted to receive the temporary spindles 112 which, in the case considered, are headless; the rod 111 has a longitudinal opening 113, the purpose of which will appear from the following.
  • the other opposing jack 114 it comprises a rod 115 and a rod extension 116 adjacent to which are located stop elements 117 and a stop means similar to that described previously but which is, in this case,
  • FIGS. 18-24 The operation of the embodiment of FIGS. 18-24 is substantially that described with respect to FIGS. 11-17. However, it will be seen (FIG. 19) that the two jacks are pressurized together while the mold is closed and molten metal is being poured into the injection chamber.
  • the jack 110 continuing its movement, extracts the rotor R5 from the sleeve 22 and engages it on the rod extension 116. This causes, on the one hand, breakage of the sprue C by means of the stops 117 and, on the other hand, the automatic ejection of the temporary spindle 112; during this time, injection of metal into the stack of plates R6 is effected at the molding station.
  • the supply station A has freed a stack of sheets R7 whose temporary spindle is, as before, located in alignment with the rods of the jacks.
  • the jack I10 placed under pressure, ensures the transfer of the stack of sheets R7 into the sleeve 22; during this time, the metal injected into the rotor at the molding station, cools while maintained under pressure.
  • a machine for casting under pressure rotors for electric rotors from a stack of magnetic sheets having apertures comprising a rotatable carrier member having at least two bores for receiving sleeves supporting stacks of sheets, a feed and delivery station including a pair of opposed jacks disposed on opposite sides of the carrier member, the first of said jacks loading a stack of sheets in a said bore in the carrier member, the second of said jacks cooperating with the first jack for removing an assembled rotor from a said bore, and a casting station comprising a pair of opposed dies and injection casting means for flowing molten metal into the stack of metal sheets, and means for rotating the carrier member so that one of said bores is first in position relative to the feed station for loading a stack of sheets into a said bore, then in position relative to the casting station for injecting molten metal therein and then in position relative to the feeding and delivery station for unloading the assembled rotor from the bore.
  • a machine as claimed in claim 6, wherein the coupling of the carrier member to the control jack comprises a T-shaped member whose stem is secured to the end of the piston rod of the said control jack and whose cross limb is associated with the carrier member between two ball races, the cross limb being longitudinally movable in an opening in a support for the carrier member.
  • V-shaped channel has one side movable relative to the other side for varying the height of the axis of the stack relative to the channel.
  • V-shaped channel is carried by a bedplate movable in a slideway parallel to the axis of rotation of the carrier member.
  • a machine as claimed in claim 8 comprising a movable stop member at the mouth of the hopper and means for intermittently actuating the stop member to move the stop member into operative position synchronously with the operation of the machine.
  • a machine as claimed in claim 3 comprising a movable discharge stop member operable by the discharge jack on the discharge side of the carrier member from inoperative position where the stop member allows unopposed discharging movement of the assembled rotor from said sleeve, to an operative position where the stop member prevents return movement of said discharged rotor into said sleeve upon retracting movements of the opposed jacks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
US789191A 1968-01-09 1969-01-06 Machine for moulding under pressure metal connecting members of rotors of electric motors Expired - Lifetime US3608622A (en)

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FR135272 1968-01-09

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US (1) US3608622A (enrdf_load_stackoverflow)
DE (1) DE1901009B1 (enrdf_load_stackoverflow)
ES (1) ES362296A1 (enrdf_load_stackoverflow)
FR (1) FR1561236A (enrdf_load_stackoverflow)
GB (1) GB1259619A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866666A (en) * 1972-10-03 1975-02-18 Prince Corp Die casting apparatus
US4064928A (en) * 1976-11-30 1977-12-27 Ex-Cell-O Corporation Die casting machine
US4093413A (en) * 1976-06-09 1978-06-06 Gebruder Buhler Ag Automated apparatus for molding or die casting
US4178984A (en) * 1978-07-06 1979-12-18 Ube Industries Apparatus for supplying inserts to the metal mold of injection molding machines
US4271895A (en) * 1980-01-28 1981-06-09 Hpm Corporation Automatic part loader unit for multi-cavity rotor die and method of operation
US4362205A (en) * 1981-02-02 1982-12-07 Hpm Corporation Rotor die casting method
US5660223A (en) * 1995-11-20 1997-08-26 Tht Presses Inc. Vertical die casting press with indexing shot sleeves

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315315A (en) * 1963-03-02 1967-04-25 Triulzi Giuseppe Device in injecting and molding presses for handling heavy articles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE536303C (de) * 1931-10-22 Sachsenwerk Licht & Kraft Ag Einrichtung zum Ein- und Ausbringen von Arbeitsstuecken in und aus der Form von Spritzgussmaschinen
DE593991C (de) * 1931-01-23 1934-03-08 Sachsenwerk Licht & Kraft Ag Verfahren zur Herstellung der Wicklung von Kaefiglaeufern durch Spritzguss
DE717726C (de) * 1939-04-02 1942-02-20 Siemens Ag Spritzgussmaschine mit selbsttaetigem Ablauf der Arbeitsgaenge
AT239985B (de) * 1963-03-02 1965-05-10 Triulzi S A S A Vorrichtung für Preßguß- und Spritzguß-Maschinen zur Förderung und Einstellung schwerer Werkstücke

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315315A (en) * 1963-03-02 1967-04-25 Triulzi Giuseppe Device in injecting and molding presses for handling heavy articles

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866666A (en) * 1972-10-03 1975-02-18 Prince Corp Die casting apparatus
US4093413A (en) * 1976-06-09 1978-06-06 Gebruder Buhler Ag Automated apparatus for molding or die casting
US4064928A (en) * 1976-11-30 1977-12-27 Ex-Cell-O Corporation Die casting machine
FR2371989A1 (fr) * 1976-11-30 1978-06-23 Ex Cell O Corp Dispositif automatique de moulage sous pression du type a carrousel
US4178984A (en) * 1978-07-06 1979-12-18 Ube Industries Apparatus for supplying inserts to the metal mold of injection molding machines
US4271895A (en) * 1980-01-28 1981-06-09 Hpm Corporation Automatic part loader unit for multi-cavity rotor die and method of operation
US4362205A (en) * 1981-02-02 1982-12-07 Hpm Corporation Rotor die casting method
US5660223A (en) * 1995-11-20 1997-08-26 Tht Presses Inc. Vertical die casting press with indexing shot sleeves

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Publication number Publication date
ES362296A1 (es) 1970-12-01
DE1901009B1 (de) 1971-05-13
FR1561236A (enrdf_load_stackoverflow) 1969-03-28
GB1259619A (enrdf_load_stackoverflow) 1972-01-05

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