EP0274183A2 - Spritzgussmaschine und Verfahren - Google Patents

Spritzgussmaschine und Verfahren Download PDF

Info

Publication number
EP0274183A2
EP0274183A2 EP87307751A EP87307751A EP0274183A2 EP 0274183 A2 EP0274183 A2 EP 0274183A2 EP 87307751 A EP87307751 A EP 87307751A EP 87307751 A EP87307751 A EP 87307751A EP 0274183 A2 EP0274183 A2 EP 0274183A2
Authority
EP
European Patent Office
Prior art keywords
rotor
turret
die
casting
station
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.)
Withdrawn
Application number
EP87307751A
Other languages
English (en)
French (fr)
Other versions
EP0274183A3 (de
Inventor
Charles H. Bennet
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.)
HPM Corp
Original Assignee
HPM Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HPM Corp filed Critical HPM Corp
Publication of EP0274183A2 publication Critical patent/EP0274183A2/de
Publication of EP0274183A3 publication Critical patent/EP0274183A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • B22D17/18—Machines built up from units providing for different combinations

Definitions

  • This invention relates to die casting apparatus for performing a complete die casting operation, said operation including a plurality of functions, said apparatus comprising: a frame including at least two stationary opposed pressure plates; and a rotating turret member disposed between said two stationary plates, and indexable through at least three positions in a cycle.
  • the apparatus may be used, for example, for automatically casting rotors for electric motors in a minimum amount of time.
  • the apparatus may be arranged to perform simultaneously a plurality of operations or functions at the stations.
  • the functions or operations to be performed at each of the stations are arranged to optimize the operating speed of the machine.
  • the invention also relates to a method for die casting rotors for electric motors in a die casting apparatus.
  • Conventional die casting machines generally include stationary front and back plates and a movable or travelling plate which is reciprocably mounted between the two stationary plates.
  • the relative positions of the stationary plates are maintained by a plurality of tie bars which extend between the two stationary plates.
  • Die halves are fastened to the front plate and the travelling plate, respectively, and the travelling plate is extended and retracted to respectively close and open the die.
  • molten metal is injected into the die to form a die cast part.
  • the die is opened by retracting the travelling die and, after the travelling plate has moved a predetermined distance, bumper pins which are slidably mounted in apertures located both in the die and the travelling plate engage a bumper plate which is located behind the traveling plate.
  • bumper pins engage and eject the diecast part from the portion of the die which is attached to the traveling plate.
  • the excess metal generally referred to as a sprue or runner system, is removed from the die cast part in a separate pressing machine called a trim press.
  • One application for die casting machines involves casting a rotor of an electrical motor.
  • the body of the motor comprises a stack of circular plates or laminations which are secured together by a temporary skew pin inserted through aligned central openings in the laminations.
  • the die casting machine is employed for casting the connector bars and end rings of the rotor assembly.
  • An indexing apparatus first picks up the rotor body at a loading station and then moves it to a casting station where the connector bars and end rings are formed.
  • the rotor is then carried through a cooling station, and the temporary skew pins are ejected from the cast rotor.
  • the rotor is removed from the machine. At some point, the sprue or runner system is removed from the completed rotor and returned to a waste container for reuse.
  • molten material usually zinc, aluminum, or magnesium
  • the molten material is conveyed to the part periphery and is injected into the side of the die cavity, thereby leaving a runner attached to the side of the cast part.
  • This is called “side gate casting.”
  • the molten metal is injected into the ends of the die cavity through inwardly tapered cone-shaped openings in the die plate. Such openings have a small diameter on the side of the die plate adjacent the interior of the die cavity.
  • This method is called "pin-point gating" because the runner system is attached to the molded part only by means of narrow necks or pin points of molded material which may be broken away to remove the runner system from the cast part.
  • a six station indexing mechanism is mounted between two stationary plates for moving a part in rotary fashion through a plurality of spaced stations. One operation is performed at each station.
  • a toggle linkage mechanism moves a traveling plate alternately forward and away from the indexing mechanism.
  • prior art die casting machines do not provide full compensation to account for various rotor stack heights.
  • such prior art die casting machines are limited to casting rotors of a certain minimum stack height or require the manual insertion or removal of spacer plates to cast rotors of various stack heights, which is time consuming and therefore undesirable.
  • the present invention overcomes the disadvantages of the above-described prior art die casting machines by providing an improved die casting apparatus.
  • die casting apparatus as initially described is characterized by a plurality of stations corresponding respectively to said positions and having tooling means located thereat for simultaneously performing at least one function of a die casting cycle at each station and performing two functions of a die casting cycle at one of the stations, the functions to be performed at each station being selected so that the times required for completion of the functions at each of the stations are approximately equal.
  • a preferred embodiment of the apparatus is a rotor die casting machine which, by use of an indexing turn table and other tooling, as hereinafter described, simultaneously performs multiple operations.
  • the required operations for die casting a rotor are performed at three stations so that all operations at each station are completed in an equal amount of time. Thus no station is idle for any amount of time and optimum cycling time is achieved.
  • the machine arrangement further provides certain tooling elements as fixed, as opposed to movable, items, which arrangement is conducive to provide maximum efficiency.
  • the machine further provides a full range of compensation for various rotor stack heights, the injection of molten shot material through a movable clamping member, and the arrangement of the injection and clamping units to provide for optimum efficiency of the machine.
  • the machine according to the present invention in one form thereof, provides a rotatable turret with three stations. At the first station the casting and compensation functions are performed, at the second station the pin pressing and trimming operations are performed, and at the third station the unloading and loading operations are performed.
  • the machine further includes a compensating section having one or more double action compensator hydraulic cylinders to provide a full range of compensation.
  • the compensating section is stationary and of relatively small mass.
  • a movable die holding block or traveling plate which operates over a short stroke is provided for closing the die casting cavity. The injection is made from the end of the machine at which the clamping cylinders are located and the injection is, therefore, made through a movable clamping plate.
  • One advantage of the present invention is that the cycle time for die casting a part is reduced as compared to prior art machines.
  • the only dictating factor for cycle time are the shot weight and metal solidification time. All other elements are worked simultaneously and within this time frame.
  • Another advantage of the present invention is that the machine is relatively simple in construction.
  • Yet another advantage of the present invention is that a full range of compensation is provided.
  • Still another advantage of the present invention is that a relatively light-weight movable tooling member or movable platen is moved over a relatively short distance to complete the die casting cavity, thereby improving machine cycle time.
  • a further advantage of the present invention is that the small movable platen is operated by hydraulic clamping cylinders which are easily adjustable over a wide pressure range and which provide for smooth, shock-free operation.
  • a yet further advantage of the present invention is that all die cast parts within selected size groupings may be cast at a uniform chamber pressure.
  • a still further advantage of the present invention is that the compensating and injecting operations are accomplished very simply and advantageously.
  • a yet still further advantage of the present invention is that the machine may be constructed as either a side gate casting machine or a pin-point gating machine.
  • the invention also consists, according to another of its aspects, in a method for die casting rotors for electric motors in a die casting apparatus, said die casting apparatus having a rotatable turret and first, second, and third stations having a plurality of tooling operatively associated therewith, said method characterized by: compensating for variable rotor stack thickness and casting a first rotor at said first station in a predetermined amount of time; simultaneously with the compensating and casting operations at said first station pressing an alignment pin out of a second rotor and trimming runner material from said second rotor at said second station in substantially said predetermined amount of time; and simultaneously with the compensating and casting operation at said first station unloading a third rotor from said turret at said third station and thereafter loading a stack of laminations into said turret at said third station in substantially said predetermined amount of time.
  • Fig. 1 there is shown a perspective view of the die casting machine 10 according to the present invention. While the disclosed embodiment is shown on a side gate casting machine, it should be understood that the machine could also be shown as a pin gate version.
  • Machine 10 includes a frame 12 on which are mounted stationary plates 14, 16, 18, and 20.
  • a rotatable turret 22 is also mounted between plates 16 and 18 as further explained hereinafter. Plates 14 and 16 are secured together by two tie rods 24 and plates 16 and 18 are secured together by means of two tie rods 26. Plates 18 and 20 are furthermore secured together by means of two tie rods 28.
  • a metal melter 30 is provided for melting the die cast metal.
  • the die casting metal may be any suitable metal such as high purity aluminum but may also be other suitable alloys.
  • the molten metal is transferred by a ladle (not shown) from the melter through an aperture 31 in metal melter 30 over a travel path shown in dotted line 32 and into an inlet opening 35 in the cold chamber sleeve 34.
  • a shot cylinder 36 is provided to move the charge of molten metal from the cold chamber into the die cavity.
  • a hydraulic power unit 38 provides the clamping power for a movable clamping plate, as further explained hereinafter.
  • a stationary compensator tooling section 42 is also shown to provide the compensating function which makes it possible to adjust the interior volume of the die casting cavity to accommodate rotor bodies having various stack heights.
  • Compensator tooling section 42 is fixedly secured between plates 14 and 16.
  • a rotor unloading chute 52 is provided whereby rotors, after being unloaded from turret 22, are guided to a rotor unloading conveyor 54 or other suitable conveying means.
  • a rotor lamination stack loading section 56 and a loading conveyor 57 as further explained hereinafter. While the invention has been illustrated for manufacturing rotors, it should be understood that the invention is not so limited and may be embodied in a machine for die casting other parts.
  • Turret 22 is shown in greater detail. For purposes of illustration and not by way of limitation, a single cavity turret is shown for casting rotors for electric motors. However it should be understood that the turret could be provided with multiple cavities whereby multiple rotors may be cast simultaneously.
  • Turret 22 is mounted on a central turntable pivot bar 60 which also serves as a tie bar to secure plates 16 and 18 in the disclosed embodiment.
  • a sleeve 71 serves as a spacer between plates 14 and 16.
  • the turret or turn table 22 is rotatable and has three gating biscuit plates 64a, 64b and 64c secured thereto at positions or stations which are spaced around the turret at 120° intervals.
  • turret 22 has three stations and operations may be simultaneously performed at these three turret stations.
  • turret 22 may be formed of any suitable material such as mild steel or aluminum
  • the gating biscuit plates 64 are preferably made of tool steel since the hot die cast metal will contact only the gating biscuit plates which are able to withstand the high temperatures so that and turret 22 is not damaged by the hot molten metal.
  • Biscuit gating plates 64 are secured to turret 22 in any suitable manner and may be removable. Gating plates 64 may also be water cooled, as is conventional, and may also be lubricated, if desired.
  • One very important aspect of the invention is that the operations to be performed in die casting a part have been so arranged and divided between the three stations that the amount of time necessary to simultaneously complete the operations at each station is approximately equal for all three stations.
  • the dictating factors for the cycle time are shot weight and metal solidification time.
  • the operations selected to be performed at the first station are the compensating and casting operations.
  • the operations selected to be performed at the second station are the loading and unloading operations, and the operations selected to be performed at the third station are the pin pressing and trimming operations.
  • a die cavity 62 is provided in turret 22 which has a liner sleeve 63 disposed therein whereinto the rotor lamination stack is loaded, as further explained hereinafter.
  • Sleeves 63 which are provided in each die cavity 62, are manufactured of hardened tool steel.
  • a runner cavity or sprue cavity 66 is provided into which the hot molten metal is transferred by the shot cylinder from the cold chamber as further explained hereafter. The hot molten metal then is forced into the die cavity.
  • a mechanism must be provided for very accurately aligning the rotating turret 22 each time turret 22 is rotatably indexed.
  • a locking cylinder (not shown) locks turret 22 accurately in place whereafter the compensating and casting operations may begin.
  • Stationary compensating section 42 includes a conventional double action compensator cylinder 70 which, after the indexing of turret 22 is completed, moves a compensator cavity 72 rightwardly into position through an aperture in stationary plate 16 and partially into sleeve 63 in turret 22, to form the left hand portion of the rotor die cavity.
  • a movable die plate 74 or clamping plate including a gate end is moved into position against the biscuit gating plate 64 by means of a clamping cylinder 40.
  • Movable die plate 74 forms the right-hand portion of the rotor die cavity.
  • the movable die plate 74 is a relatively small, light-weight part which moves over a relatively small distance.
  • die plate 74 moves only three and one-half (3-1/2) inches from the fully open to the fully closed position and a greater movement range could be accommodated.
  • the die plate moves a distance of about seven and one-half (7-1/2) inches.
  • the double staging for pin gate requirements would be split with three and one half (3-1/2) inches for turret clearance and four (4) inches for gate removal.
  • Fig. 5 it can further be seen that compensator cavity 72 has been moved into position by compensator cylinder 70 into the left-hand side of sleeve 63 in turret 22.
  • the movable die plate 74 is shown in its closed position against the right-hand side of turret 22.
  • the cold chamber sleeve 76 which extends through aperture 77 in stationery plate 18 has been supplied with hot molten metal from the ladle, diagrammatically shown at 78, so that the stationary shot cylinder 36 is now in position to move shot rod 80 toward the left whereby ram 82 forces the hot molten metal through the runner system in die plate 74 and into the die cavity.
  • the rotor comprises a stack of soft iron laminations 92 which are held together by means of a removable stack pin 94, which is disposed in aligned central apertures of the laminations which form an aperture 95.
  • the laminations further include a plurality of apertures located around the outside circumference of the laminations.
  • the laminations are stacked so that the outside apertures align to form a series of skewed bores through the stack.
  • the bores provide channels into which the hot molten metal is injected, thereby forming a series of conductor bars 96 as shown and as is well known in conventional squirrel cage rotors.
  • a pair of end rings 98 and 99 are provided to interconnect conductor bars 96 whereby current may be induced in the rotor as it revolves within the stator of an electric motor.
  • the lamination stack height is a matter of designer's choice depending upon the desired characteristics and application of the electric motor.
  • the diameter of the rotor may also be varied depending upon the desired characteristics and application of the motor.
  • FIG. 6 shows the compensator cavity 72 which is driven by means of a rod 106 and the compensator cylinder 70 which is housed in stationary compensator tooling section 42.
  • the end ring 99 of rotor 90 is formed in cavity 109 of compensator cavity 72.
  • Cavity sleeve 63 has a threaded fastener 108 disposed in an aperture thereof for securing sleeve 63 in turret 22.
  • a gate cavity 110 which is secured to the movable die plate 74 by means of threaded fasteners 112.
  • the gate cavity 110 includes an end ring cavity 113 for forming the end ring 98 of rotor 90.
  • Gate cavity 110 further includes a runner cavity 114 through which the hot molten metal travels from cold chamber sleeve 76 into the rotor die cavity.
  • the tooling of Fig. 6 is mounted at the twelve o'clock station of turret 22.
  • FIG. 7 the tooling for pressing the stack pin 94 from a completed rotor 90 and for trimming the runner or sprue material 116 from the completed rotor 90 is shown.
  • a stem press rod 120 is shown which is activated by a hydraulic cylinder as described hereinafter. Rod 120 engages with a presser stem 122 for pressing stack pin 94 from a completed rotor 90.
  • a trim die and stripper assembly 124 is also shown including a trim die 126 which is mounted on the stripper 130.
  • a space 128 is provided between trim die 126 and stripper 130 whereby the trim die is axially movable with respect to stripper 130, as further explained hereinafter.
  • the tooling of Fig. 7 is mounted at the four o'clock station of turret 22 adjacent a biscuit gate plate 64B as shown in Fig. 2.
  • FIG. 8 the loading and unloading tooling is shown which is mounted at the eight o'clock station of turret 22 adjacent a biscuit gate plate 64C as shown in Fig. 2.
  • a loading rod 132 is shown for engaging with a feed button 134 to load rotor lamination stacks 94 into sleeve cavity 63 of turret 22.
  • a feed sleeve 136 is shown and into which a completed rotor assembly 90 is pressed by feeder rod 132 and feed button 134 after the rotor assembly has been completed, the stack pin 94 has been pressed out of the rotor assembly 90 and the runner has been removed therefrom in the press and trim station.
  • FIG. 10a shows the compensator 72 located in the die casting position within cavity sleeve 63 of turret 22.
  • Compensator 72 is engaged with the left-hand side of lamination stack 92.
  • the movable die plate 74 has been moved into the die casting position by clamp cylinders 40.
  • the gate side ejector cylinder 140 is back in the right-hand position. Cylinder 140 is required in cases where the rotor design has greater shrinkage or binding in the gate half only, and is an auxiliary device.
  • cylinder 140 is used only when needed to prevent rotors sticking in the gate side.
  • cylinder 140 is operated forwardly simultaneously with clamp retraction to assist in sticking the rotor to the correct turret side.
  • the amount of travel of the movable die 74 is only three and one half (3-1/2) inches in the disclosed side gated embodiment instead of the relatively large travel distance of the movable die plate of conven­tional die casting machines.
  • the movable die will travel about seven and one-half (7-1/2) inches in a pin gating embodiment of the invention.
  • cold chamber sleeve 76 is in position to receive a charge of molten metal whereupon ram 82 forces the molten metal, by the operation of shot rod 80, through the runner system and into the die cavity comprising cavity 109 in compensator 72, cavity 113 in gate cavity 110, and the channels formed by the aligned apertures in the lamination stack 92.
  • ram 82 has moved into position to force the molten metal into the die cavity and that the shot is holding to permit the metal in the die cavity to solidify.
  • compensator 72 has moved leftward and end ring 99 has already solidified.
  • the gate side ejector cylinder 140 is still in the back position.
  • Fig. 10c the gate side ejector cylinder 140 has moved forwardly as the movable die 74 retracts together with the shot sleeve 76. It can be seen that ram 82 is in position to retract whereby turret 22 is ready to rotate together with the completed rotor assembly 90 and the attached solidified sprue or runner 116.
  • FIG. 11 a perspective rear view of the die casting machine is shown.
  • a pin press out cylinder 146 is shown as well as a trim cylinder 148. Further, the trim die and stripper assembly 124 is shown. Lastly, a pin discharge pan 150 is shown for receiving stack pins 94 after they have been pressed out of a completed rotor and a gate scrap discharge chute 152 is shown for receiving discarded sprues or runners.
  • Figs. 12a-12e the operation of the trim and pin press sequence, as performed at the four o'clock station of turret 22, is seen.
  • Fig. 12a it can be seen that, after a rotor 90 has been cast and the turret 22 has rotated so that a cast rotor 90, including the attached solidified sprue or runner 116, has rotated from the twelve o'clock station to the four o'clock station, the presser stem 122, is in the back position and at rest. At this point, the trim section 124 is also in the back position and at rest.
  • Trim section 124 includes trim die 126 which, as shown in Figs. 7, 12a and 12b is spaced from stripper 130 by means of a space 128, which spacing may be provided by a spring or other suitable basing device.
  • a plurality of bolts 156 which may be spring loaded, secures trim die 126 to stripper 130.
  • the trim section has been moved against rotor 90 whereby stripper 130 engages with the right-hand side of the lamination stack 90, as shown. At this point, stripper 130 only just contacts the rotor but has yet not moved the rotor.
  • trim die 126 has just engaged with sprue 116.
  • stripper 130 has now advanced further thereby moving rotor 90 leftwardly, thus closing gap 128 between trim die 126 and stripper 130 so that the trim die 126 continues to engage with the runner or sprue 116.
  • sprue 116 is severed from rotor 90 but is retained and clamped in position against cavity sleeve 63.
  • presser stem 122 is now moved to the right to engage with stack pin 94a.
  • Presser stem 122 has thus continued its rightward movement and has forced stack pin 94a into aperture 160 of stripper 130 thereby forcing stack pin 94b, which had been retained in cavity 160, into open cavity 158, whereby pin 94b is free to drop into pin discharge pan 150 as shown in Fig. 11.
  • Pin 94a is now retained in aperture 160 of stripper 130, from which it will be dislodged during the next pin press operation.
  • presser stem 122 With the completion of the pin press operation, presser stem 122 is now ready to be moved toward the left again.
  • the trim section 124 now moves to the right whereby the clamping force on sprue 116 is removed so that severed sprue 116 may drop downwardly into gate scrap discharge chute 152 (Fig. 11).
  • the lost motion provided by spring loaded bolts 156 permits gap 128 to be opened again between trim die 126 and stripper 130.
  • Figs. 13a-13d the unloading operation of a completed rotor 90 is illustrated.
  • the unload and load station is located at the eight o'clock position of turret 22.
  • the pusher stem 132 and feed button 134 are in the retracted position and the completed rotor is housed in cavity 62 in sleeve 63 of turret 22.
  • no stack pin is located in the aperture 95 of lamination stack 92.
  • Fig. 13a-13d the unloading operation of a completed rotor 90 is illustrated.
  • the unload and load station is located at the eight o'clock position of turret 22.
  • the pusher stem 132 and feed button 134 are in the retracted position and the completed rotor is housed in cavity 62 in sleeve 63 of turret 22.
  • no stack pin is located in the aperture 95 of lamination stack 92.
  • pusher stem 132 has advanced to the right whereby feed button 134 has pushed completed rotor 90 toward the right and has ejected the rotor from sleeve 63 and onto a discharge chute 52 diagrammatically shown in Fig. 13b and in Fig. 1.
  • a new rotor stack 92 including a stack pin 94 is now ready for loading into sleeve 63.
  • the pusher stem 132 and feed button 134 are again in their retracted positions.
  • feed button 134 will push the rotor stack 92 into cavity 62 and position stack 92 in its casting position as shown in Fig. 13d.
  • Turret 22 is now ready for indexing rotatably to the twelve o'clock position wherein the hot metal is cast into the die cavities as explained hereinabove.
  • the rotor load section 56 includes a loading mechanism for removing rotor lamination stack 92 from a transporting mechanism such as loading chute 164 and to load the stacks into a loading member preparatory to loading the stacks into sleeve 63 of turret 22.
  • Rotor lamination stacks 92 are aligned in a row on a loading chute 164 so that hinged loading member 166 may receive a rotor stack therefrom. While in the illustrated embodiment only one rotor stack 92 at a time is transferred to member 166 and turret 22, more than one stack could also be transferred simultaneously for a multiple cavity turret 22.
  • Rotor stacks 92 are moved into loading member 166 by means of hydraulically operated cylinders 168. After loading of a rotor stack 92 into hinged member 166, member 166 is pivoted upwardly and is then aligned with respect to turret 22 by means of hydraulic cylinder 170. After this lateral positioning is completed, the stack 92 is loaded into turret 22 by means of a pusher cylinder 172 including pusher stems 132. It should be noted that the loading operation of the hinged loading member 166 from chute 164 may proceed while turret 22 is not yet in position to receive a new pair of rotor lamination stacks 90.
  • One hinged loading member 166 is provided which moves laterally from the outboard position and receives a rotor from the transporter. Loading member 166 then moves inboard and aligns with the turret.
  • the compensator will be moved into position against the lamination stack 92 and, at the same time, movable die plate 74 will move into position against the gating plate 64 and the turret 22. Molten metal is then poured into the cold chamber sleeve 76 and will be forced by the shot cylinder 36 through the runner cavity 114 and into the die cavities 109, and 113. While these operations are proceeding at the twelve o'clock station, stack pin 94 will be pressed out of the completed rotor 90 at the four o'clock station and, at the same time, the runner or sprue 116 will be trimmed from the completed rotor 90 and collected in a suitable receptacle at the eight o'clock station.
  • a completed rotor will be unloaded from die cavity 62 and will be loaded onto conveyor 54. Thereafter, a new rotor lamination stack will be loaded into die cavity 62 in preparation for a die casting operation.
  • turret 22 is indexed and the same operations are repeated.
  • the operations at all three stations proceed simultaneously.
  • the operations to be performed at the three locations have been chosen so that the amount of time taken to complete the operations at each station are as nearly equal as possible. Therefore, no time is wasted at any of the stations in waiting for completion of operations at any other station.
  • the cycle time is thus optimized and machine productivity is increased.
  • Fig. 15 shows a time cycle chart which illustrates the duration of a cycle. As clearly indicated, the times required for completing the operations which are to be performed at the twelve o'clock station, the four o'clock station, and the eight o'clock station are approximately equal. From the time cycle chart it can also be seen that the time required for metal solidification is a limiting factor for total cycle time. It can also be seen that the operation at the respective stations occur simultaneously. Further, it can be seen that the time required to rotate the turret is a limiting factor in establishing cycle time. Lastly, clamping and the time to make shot are limiting factors.
  • a single cavity apparatus may have a cycle in the range of 11.7 seconds to 17.5 seconds for rotors having an outside rotor diameter ranges from 2 inches to 5 inches. This is a significant improvement over prior art machines wherein comparable cycle times conventionally were generally two to three times greater.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Specific Conveyance Elements (AREA)
  • Punching Or Piercing (AREA)
EP87307751A 1986-12-09 1987-09-02 Spritzgussmaschine und Verfahren Withdrawn EP0274183A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US93963286A 1986-12-09 1986-12-09
US939632 1986-12-09

Publications (2)

Publication Number Publication Date
EP0274183A2 true EP0274183A2 (de) 1988-07-13
EP0274183A3 EP0274183A3 (de) 1988-08-10

Family

ID=25473493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87307751A Withdrawn EP0274183A3 (de) 1986-12-09 1987-09-02 Spritzgussmaschine und Verfahren

Country Status (3)

Country Link
EP (1) EP0274183A3 (de)
JP (1) JPS63144850A (de)
CN (1) CN1008244B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438969A1 (de) * 1993-11-01 1995-05-24 Holdt J W Von Universal-Gußform
CN110202110A (zh) * 2019-06-26 2019-09-06 东莞市克诺五金有限公司 一种皮带扣寸五主板自动生产线

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08243715A (ja) * 1995-03-02 1996-09-24 Tonen Tenchii Kofun Yugenkoshi モータロータのモールディングプレス装置
FI121410B (fi) * 2003-06-24 2010-11-15 Alstom Technology Ltd Menetelmä sähkösuodattimen puhdistamiseksi suodatustoiminnan aikana ja sähkösuodatin
US11462975B2 (en) * 2016-11-11 2022-10-04 Mistri Zakir Husein G Machine and process of copper rotor die casting used in AC electric motor
CN106890969A (zh) * 2017-03-29 2017-06-27 嘉善永金金属制品有限公司 一种具有升降功能的铸件压力装置
CN113680991B (zh) * 2021-08-26 2022-05-27 燕山大学 用于真空压铸机的多工位连续压射机构及其压射方法

Family Cites Families (5)

* 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
JPS5510387Y2 (de) * 1974-09-24 1980-03-06
JPS5146042A (ja) * 1974-10-18 1976-04-20 Hitachi Ltd Kyorakuetsuchigatateikokairomokoseinyoru haiburitsudokairo
US4064928A (en) * 1976-11-30 1977-12-27 Ex-Cell-O Corporation Die casting machine
US4362205A (en) * 1981-02-02 1982-12-07 Hpm Corporation Rotor die casting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438969A1 (de) * 1993-11-01 1995-05-24 Holdt J W Von Universal-Gußform
CN110202110A (zh) * 2019-06-26 2019-09-06 东莞市克诺五金有限公司 一种皮带扣寸五主板自动生产线

Also Published As

Publication number Publication date
JPS63144850A (ja) 1988-06-17
CN87107238A (zh) 1988-06-22
CN1008244B (zh) 1990-06-06
EP0274183A3 (de) 1988-08-10

Similar Documents

Publication Publication Date Title
US4064928A (en) Die casting machine
US4886106A (en) Die cast machine with a turret
US3866666A (en) Die casting apparatus
US5660223A (en) Vertical die casting press with indexing shot sleeves
US4093413A (en) Automated apparatus for molding or die casting
EP0274183A2 (de) Spritzgussmaschine und Verfahren
GB2032334A (en) Installation for producing composite castings
WO2001005537A1 (en) Vertical die-casting press
JP3102368U (ja) 垂直プレス用のダイキャスト装置
EP1410860A1 (de) Vorrichtung und Verfahren zum Abtrennen von Schrott von Metallgussteilen
US20040119205A1 (en) Rotating turret molding machine and associated process
CN117086282B (zh) 一种笼式电机铸铝转子的压铸成型模具以及成型方法
CA1149118A (en) Plastic injection molding machine
US4362205A (en) Rotor die casting method
JP2001150496A (ja) 金型からの製品取り出し方法
US2248461A (en) Multiple die for composite articles
CA1101183A (en) Die casting machine
KR900005274B1 (ko) 수직 다이 주조기
JPS62161451A (ja) 射出成形品のせき折り装置
JP2850706B2 (ja) モータロータのダイカスト成形方法とその装置
JPH0673878B2 (ja) 射出成形金型装置
JPH0545348B2 (de)
JPS6229216Y2 (de)
IES81092B2 (en) A method and a mould for moulding an article
JPH05288Y2 (de)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): CH DE FR GB IT LI

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR GB IT LI

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890213

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BENNET, CHARLES H.