DE112008001353T5 - Mold clamping device and method for controlling the mold clamping device - Google Patents

Mold clamping device and method for controlling the mold clamping device Download PDF

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Publication number
DE112008001353T5
DE112008001353T5 DE200811001353 DE112008001353T DE112008001353T5 DE 112008001353 T5 DE112008001353 T5 DE 112008001353T5 DE 200811001353 DE200811001353 DE 200811001353 DE 112008001353 T DE112008001353 T DE 112008001353T DE 112008001353 T5 DE112008001353 T5 DE 112008001353T5
Authority
DE
Germany
Prior art keywords
mold
mold clamping
closing
linear motor
electromagnet
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Withdrawn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
DE200811001353
Other languages
German (de)
Inventor
Hiroshi Chiba-shi Satou
Tatsuya Chiba-shi Shibata
Koki Chiba-shi Tsunemi
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.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
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
Priority to JP2007-134623 priority Critical
Priority to JP2007134623 priority
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to PCT/JP2008/059315 priority patent/WO2008143277A1/en
Publication of DE112008001353T5 publication Critical patent/DE112008001353T5/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/7653Measuring, controlling or regulating mould clamping forces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C2045/1784Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1792Machine parts driven by an electric motor, e.g. electric servomotor
    • B29C2045/1793Machine parts driven by an electric motor, e.g. electric servomotor by an electric linear motor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • B29C2045/645Mould opening, closing or clamping devices using magnetic means

Abstract

A mold clamping apparatus having an electromagnet that drives a mold clamping operation and a mold opening / closing drive unit, the mold clamping apparatus comprising:
a mold opening / closing drive unit which is variably controlled while a mold clamping force is generated by the electromagnet.

Description

  • BACKGROUND OF THE INVENTION
  • Field of the invention
  • The The present invention relates to a mold clamping device and a method of controlling a mold clamping device.
  • Description of the related technology
  • In In the related art, an injection molding machine injects a resin from an injector of an injector, fills cavities between a fixed mold and a movable mold with the resin, and hardens the Resin, so that a molded product is obtained. Furthermore, a Mold clamping or mold closing device provided, the moves the movable mold relative to the fixed mold to to close the mold, clamp the mold together and to open the mold.
  • When Mold clamping device exist a hydraulic mold clamping device, by delivering oil to a hydraulic cylinder is driven, and an electric mold clamping device, which is driven by an electric motor. The electric mold clamping device However, it has high controllability and high energy efficiency and does not pollute or contaminate the environment. For this Reason finds the electric mold clamping device wide Use. In this case, when the electric motor is being driven, a ball screw is rotated so as to generate a thrust force becomes. Then, the thrust force by a changeover or toggle mechanism reinforced, so that the electric mold clamping device produces a large mold clamping force.
  • There the toggle mechanism in the electric mold clamping device Meanwhile, with the above-mentioned construction, it is difficult to the mold clamping force due to the properties to change the tilting or toggle mechanism. Further are the response and the sensitivity and the stability the electric mold closing device weak and it is not possible the mold clamping force during of shaping. Accordingly, it has a mold clamping device given the thrust directly as a clamping or closing force can be used, which is generated by the ball screw. In this case, because the torque of the electric motor proportional to the mold clamping force is, it is possible the To control mold clamping force during molding.
  • According to the However, mold-closing apparatus in the related art is the load resistance of the ball screw is low, it is not possible a large mold clamping force too generate and the mold clamping force fluctuates due to Torque variations that are generated in the electric motor. Furthermore, the electric current must be constantly supplied to the electric motor be to produce a mold clamping force, so that the Amount of heat generated and power consumption of the Electric motors are big. Accordingly, must the rated power of the electric motor can be increased so much that the manufacturing cost of the mold clamping device increase.
  • Accordingly, consideration has been given to a mold clamping apparatus which uses a linear motor to open and close a mold and uses an attraction force of an electromagnet to clamp a mold (for example, see Patent Document 1).
    • Patent Document 1: Brochure of International Publication No. 05/090052
  • In the mold clamping device disclosed in Patent Document 1 is disclosed, however, are a drive unit for opening and closing the mold and a mold clamping drive unit (Electromagnet) provided independently. Accordingly, except the timing for closing the Shape and timing for applying a mold clamping or mold clamping force are suitably controlled, the possibility that form errors, form breaks and the like occur.
  • If for example, a torque limit value of the drive unit for opening and closing the mold before a mold clamping process becomes 0 (when the supply of electricity to the drive unit to open and closing the mold is stopped), the position deviates the mold before a mold clamping or mold closing process, which should be controlled at a time, from a time in which a mold clamping force is generated. For this reason It is difficult to achieve a mold clamping force on an expected Create position so that there are concerns that the above mentioned Form errors and the like will occur.
  • Especially becomes an open molding process which injects a resin a mold clamping force is applied for the Ultra-high precision molds used. In this case, must the high-precision position control in an order of magnitude of a few microns and a few tiny ones Deviation from the position can not be ignored or tolerated become.
  • SUMMARY OF THE INVENTION
  • The Invention was made in view of the above-mentioned aspects and it is an object of the invention to provide a mold clamping device which can improve the accuracy of a position, at the one mold clamping force in connection with a drive unit to open and close a mold and a A method of controlling the mold clamping device is generated becomes.
  • Accordingly, to achieve this goal, according to the invention the mold clamping device has an electromagnet for driving a mold closing operation and a drive unit for opening and closing the mold, and the drive unit for opening and closing the mold is controlled in a variable manner, while a mold clamping force by the solenoid is produced.
  • Further can in the invention, the drive unit for opening and Closing the mold to be a linear motor and a current which is used for position control can be delivered to the linear motor during a pressure-increasing operation by the electromagnet is executed.
  • Further In the invention, the current used for the position control is used to be delivered to the linear motor while a pressure increasing operation is performed by the solenoid.
  • About that In addition, in the invention, the power is supplied to the linear motor until the mold closing force generated by the electromagnet becomes reached predetermined value.
  • Further In the invention, the predetermined value may become larger as a value of a force according to the cogging torque be the linear motor.
  • About that In addition, in the invention, the supply of power to the linear motor are stopped after the mold clamping force the predetermined Has achieved value.
  • additionally In the invention, the current to the linear motor in a predetermined Period after the mold clamping force generated by the electromagnet.
  • According to the Invention, it is possible a mold clamping or mold clamping device which can improve the accuracy of a position, at the one mold clamping force in connection with a drive unit is generated for opening and closing a mold, and a method of controlling the mold clamping device.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • 1 Fig. 12 is a view showing states of a molding apparatus and a mold clamping apparatus according to an embodiment of the invention when a mold is closed.
  • 2 FIG. 14 is a view showing the states of the molding apparatus and mold clamping apparatus according to the embodiment of the invention when a mold is opened. FIG.
  • 3 Fig. 13 is a view illustrating the operation of the mold clamping apparatus in a mold closing operation and a mold clamping operation.
  • 4 FIG. 14 is a view showing a modification where a rotating motor that closes a magnetic field generating area by a motor frame is used. FIG.
  • DETAILED DESCRIPTION THE INVENTION
  • One Embodiment of the invention will hereinafter in the Detail described with reference to the drawings. In this Embodiment becomes a moving direction of a movable Plate of a mold clamping device during the Closing a form described as a forward direction, a moving direction of the movable plate during opening a shape is described as a backward direction, a direction of movement of a screw or screw of an injection device during injection is considered a forward direction described and a direction of movement of the screw during the dosage is considered a reverse direction described.
  • 1 Fig. 12 is a view showing states of a molding apparatus and a mold clamping apparatus according to an embodiment of the invention when a mold is closed. 2 FIG. 14 is a view showing the states of the molding apparatus and mold clamping apparatus according to the embodiment of the invention when a mold is opened. FIG.
  • In the drawings, the reference numeral designates 10 a mold clamping device; reference character Fr denotes a frame of an injection molding machine; Reference character Gd denotes two guides (only one of the two guides Gd is shown in the drawings) as first guide members which rest on the frame Fr, form rails, and supports and guides the mold clamping device 10 ; and the reference numeral 11 denotes a fixed plate as a first fixed member disposed on the guides Gd and fixed to the frame Fr and the guides Gd. A back plate 13 as a second fixed member is arranged so that it to the fixed plate 11 points, with a predetermined distance between the rear plate and the fixed plate 11 , and leadership columns 14 (only two guide columns of the four guide columns 14 are shown in the drawings) as four links are between the fixed plate 11 and the rear plate 13 intended. Meanwhile, the back plate is 13 arranged on the guides Gd to slightly relative to the guides Gd by the expansion and contraction of the guide columns 14 to be moved.
  • In this embodiment, the fixed plate 11 attached to the frame Fr and the rear plate 13 can be moved slightly relative to the guides Gd. The back plate 13 however, it may be fixed to the frame Fr and the guides Gd, and the fixed plate 11 can be moved slightly relative to the guides Gd.
  • Further, a movable plate 12 as a first movable member to freely move forward and backward in a mold opening / closing direction while traveling along the guide columns 14 to the fixed plate 11 has. For this purpose, guide bores or guide holes (not shown) through which the guide columns 14 go through, on parts of the movable plate 12 formed with the guide columns 14 to match.
  • A first thread (not shown) is at a front end part of the guide pillar 14 formed, so that the guide column 14 on the fixed plate 11 by screwing a nut n1 on the first thread is attached. Further, a guide post 21 as a second guide member whose outer diameter is smaller than the outer diameter of the guide column 14 is, integral with the guide column 14 formed at a predetermined rear part of each guide column 14 to from the rear end surface of the rear plate 13 protrude backwards. Further, a second thread (not shown) is formed on a part of the guide post, which attaches to the rear end surface of the rear plate 13 lies, leaving the fixed plate 11 and the back plate 13 are connected to each other by screwing a nut n2 on the second thread. In this embodiment, the guide post has been 21 integral with the guide column 14 educated. The guide post 21 but can be separated from the guide column 14 be formed.
  • Further, a fixed shape 15 as a first shape on the fixed plate 11 attached and a movable form 16 as a second form is on the movable plate 12 attached. While the movable plate 12 is advanced and withdrawn, nourishes the movable mold 16 the established form 15 on and is removed from this, so that the mold can be closed, clamped and opened. While the mold is being clamped together, a plurality of cavities (not shown) are interposed between the fixed mold 15 and the movable form 16 and each of the cavities is filled with a resin (not shown) as a molding material discharged from an injection nozzle 18 an injection device 17 is injected. Meanwhile form the solid form 15 and the movable form 16 a molding device 19 ,
  • In addition, an attraction plate 22 as a second movable member which is parallel to the movable plate 12 is arranged so arranged that it is free along the corresponding guide post 21 on the back of the back plate 13 can be advanced and withdrawn, and is guided by the guide posts 21 guided. Meanwhile, the guide holes 23 through which the guide posts 21 go through, on parts of the attraction plate 22 formed with the corresponding guide posts 21 to match. The leadership hole 23 includes a part 24 of large diameter, which is open to the front of the end face of the attraction plate and receives the ball nut n2, and a part 25 of small diameter, leading to the rear end surface of the attraction plate 22 is open and includes a sliding surface on the guide post 21 slides. In this embodiment, the attraction plate 22 through the guide posts 21 guided. The attraction plate 22 But not only through the guide posts 21 but also be guided by the guides Gd.
  • Meanwhile, a linear motor 28 serving as a first drive unit and a drive unit for opening and closing the mold (mold opening / closing drive unit) between the frame Fr and the movable plate 12 arranged to cause the movable plate 12 advances and withdraws. The linear motor 28 includes a stator 29 as a first drive element and a movement device 31 as a second drive element. The stator 29 is formed so as to be parallel to the guide Gd on the frame Fr and to a moving range of the movable plate 12 matches. The movement device 31 is over a predetermined range at the lower end of the movable plate 12 formed to the stator 29 to assign.
  • The movement device 31 includes a core 34 and coils 35 , Furthermore, the core comprises 34 a variety of pole teeth 33 leading to the stator 29 projecting and are formed with a predetermined distance. The sink 35 is around each of the magnetic pole teeth 33 meanwhile, the magnetic pole teeth are wound around 33 parallel to each other in a direction perpendicular to the moving direction of the movable plate 12 educated. Furthermore, the stator comprises 29 a core (not shown) and a permanent magnet (not shown) formed to extend on the core. The permanent magnet is formed by alternately magnetized magnetic poles, such as N and S poles with the same distance as those of the magnetic pole teeth 33 ,
  • As the permanent magnet in the linear motor 28 is used here, the strength and weakness of a magnetic field in a magnetic field occur between the stator 29 and the movement device 31 is produced. A cogging torque whose position is restricted by the magnetic force of the permanent magnet is detected in the moving device 31 generated by the strength and weakness of the magnetic field. For this reason, a current sufficient to overcome the cogging torque must be applied to the coils 35 to be delivered.
  • If the linear motor 28 by supplying a predetermined current to the coils 35 is driven, the movement device 31 advanced and withdrawn. Accordingly, the movable plate becomes 12 advanced and withdrawn so that it is possible to open and close the mold.
  • Meanwhile, the stator became 29 provided with the permanent magnet and the moving device 31 was with the coils 35 intended. However, the stator may be provided with the coils, and the moving device may be provided with a permanent magnet. In this case, because the coils are not moved when the linear motor 28 is driven, it is possible to easily implement the wiring for supplying the electric current to the coils.
  • When the movable plate 12 moved forward and the movable mold 16 in this way in contact with the fixed form 15 comes, the mold is closed and then clamped together. Further, a solenoid unit 37 serving as a second drive unit and a mold-closing drive unit, between the rear plate 13 and the attraction plate 22 arranged to close or clamp the mold together. There is also a pole 39 as a mold clamping force transmitting member extending to pass through the back plate 13 and the attraction plate 22 to go through and the movable plate 12 with the attraction plate 22 connects, arranged so that they can move freely and retreat. When the mold is closed and opened, the rod causes 39 the attraction plate 22 to advance and retract while advancing and retracting the movable plate 12 is locked. When the mold is clamped together, the rod transmits the mold clamping force generated by the solenoid assembly 37 is generated on the movable plate 12 ,
  • Meanwhile, the mold clamping device comprises 10 the fixed plate 11 , the movable plate 12 , the rear plate 13 , the attraction plate 22 , the linear motor 28 , the electromagnet unit 37 , the pole 39 and similar.
  • The electromagnet unit 37 includes an electromagnet 49 as a first drive member, on the rear plate 13 is formed, and an attraction part 51 as a second drive member, which is on the attraction plate 22 is formed. The attraction part 51 is at a predetermined part of the front end surface of the attraction plate 22 formed, ie on a part of the attraction plate 22 the pole 39 surrounds and to the electromagnet 49 in this embodiment. There are also two grooves 45 as a coil arrangement part having a rectangular cross section parallel to each other at the part of the rear end surface of the rear plate 13 formed, ie slightly below and above the rod 39 in this embodiment. A core 46 with a rectangular shape is between the corresponding grooves 45 formed and a yoke 47 is formed on the other part of the rear plate. Further, a coil 48 around the core 46 wound.
  • Meanwhile, the core 46 and the yoke 47 formed integrally, but may be formed by laminating thin plates formed of ferromagnetic bodies, thereby forming an electromagnetically laminated steel plate.
  • In this embodiment, the solenoid is 49 separately from the rear plate 13 formed and the attraction part 51 is separate from the attraction plate 22 educated. However, the electromagnet can be considered part of the rear plate 13 formed and the attraction part can as a part of the attraction plate 22 be formed.
  • Accordingly, when power to the coil 48 in the electromagnet unit 37 is delivered, the electromagnet 49 driven, pulls the attraction part 51 and generates the mold clamping force.
  • Further, the pole 39 with the attraction plate 22 connected to the rear end portion and is connected to the movable plate 12 connected to the front end portion. Accordingly, when the movable plate moves 12 is advanced when the mold is closed, the rod 39 forward and push the attraction plate 22 forward. Because the movable plate 12 is withdrawn, when the mold is opened, the rod is retracted and causes the attraction plate 22 is withdrawn.
  • For this purpose is a hole 41 through which the rod 39 passes through, in the middle part of the rear plate 13 formed, a hole 42 through which the rod 39 goes through is in the middle part of the attraction plate 22 formed and a bearing member Br1, such as a socket, which the rod 39 To allow the rod to slide, it is arranged to engage with an opening of the front end portion of the hole 41 match. There is also a screw 43 at the rear end part of the rod 39 educated, and a mother 44 as a shape thickness adjusting mechanism, which is rotatable by the attraction plate 22 is borne by a thread on the screw 43 appropriate.
  • Meanwhile, when the closing of the mold is completed, the attraction plate nourishes itself 22 the rear plate 13 and a gap δ is between the back plate 13 and the attraction plate 22 educated. However, if the gap δ is excessively small or excessively large, the attraction part can 51 are not sufficiently attracted, so that a mold clamping force is reduced. Further, an optimum gap δ varies with the change of the thickness of the molding apparatus 19 ,
  • Accordingly, a large-diameter gear (not shown) is on the outer peripheral surface of the nut 44 formed, a shape thickness adjustment motor (not shown) as a drive unit for adjusting the mold thickness is at the attraction plate 22 and a small-diameter gear fixed to an output shaft of the shape-thickness-adjusting motor is engaged with the gear formed on the outer peripheral surface of the nut 44 is formed.
  • When the mold thickness adjustment motor is driven to increase the thickness of the molding apparatus 19 adapt, and the mother 44 relative to the screw 43 is rotated by a predetermined angle of rotation, the position of the rod 39 relative to the attraction plate 22 adapted and the position of the attraction plate 22 relative to the fixed plate 11 and the movable plate 12 will be adapted. Accordingly, it is possible to set the gap δ to an optimum value. Ie. The mold thickness is changed by changing the position of the movable plate 12 relative to the attraction plate 22 customized.
  • Meanwhile, the mold thickness adjustment motor, the gears, the nut make 44 , the pole 39 and the like, a shape thickness adjusting device. Further, a rotation transmitting unit which controls the rotation of the shape thickness adjusting motor on the nut 44 transmits, formed by the gears. In addition, a rotation direction conversion unit becomes the nut 44 and the screw 43 formed and the rotational movement of the mother 44 becomes in the linear movement of the rod 39 converted in the direction of rotation conversion unit. In this case, a first conversion element becomes the mother 44 formed and a second conversion element is by the screw 43 educated.
  • The drive of the linear motor 28 and the electromagnet 49 the mold closing device 10 is controlled by a control unit 60 controlled. The control unit 60 includes a CPU or a processor, a memory and the like. Further, the control unit includes a circuit that supplies power to the coil 35 of the linear motor 28 or the coil 48 of the electromagnet 49 in accordance with the result calculated by the processor. Further, a load detector 55 with the control unit 60 connected. The load detector 55 is at a predetermined position on at least one guide column 14 (a predetermined position between the fixed plate 11 and the rear plate 13 ) in the mold clamping device 10 arranged, and detects a load on the guide column 14 is applied. In the drawings are the load detectors 55 on two (upper and lower) guide columns 14 arranged. The load detector 55 is formed from, for example, a sensor which controls the extension of the guide column 14 detected. The load passing through the load detector 55 is detected, is sent to the control unit 60 Posted. Meanwhile, for the sake of simplicity, the control unit 60 in the 2 Not shown.
  • The operation of the mold clamping device 10 with the above-mentioned construction will be described below.
  • A mold closing operation is performed by a mold opening / closing processor 61 the control unit 60 controlled. The mold opening / closing processor 61 supplies power to the coil 35 in a state in 2 is shown (a state in which a mold is opened). The following is the linear motor 28 driven to the movable plate 12 advance and the movable form 16 comes in contact with the fixed form 15 , as in 1 shown. In this case, a gap δ between the rear plate 13 and the attraction plate 22 gebil det, ie between the electromagnet 49 and the attraction part 51 , Meanwhile, a force required to close a mold is sufficiently small as compared to the mold clamping force.
  • Subsequently, a mold clamping processor controls 62 the control unit 60 a mold clamping process. The mold clamping processor 62 supplies power to the coil 48 and pull the attraction part 51 by an attraction of the electromagnet 49 at. Accordingly, the mold clamping force on the movable plate 12 through the attraction plate 22 and the pole 39 transferred so that the mold is clamped together. When the mold clamping force is changed, such as when the mold clamping is started to be performed, with the above-mentioned structure in this embodiment, the mold clamping processor becomes 62 controlled to provide continuous current (hereinafter referred to as "rated current") required to produce a target mold clamping force to be obtained by the change, ie, a target mold clamping force in a steady state (hereinafter, the mold clamping force is referred to as " stationary Formklemm- or Formschließkraft "referred to), namely to the coil 48 ,
  • Meanwhile, the mold clamping force by the load detector 55 detected. The detected mold clamping force is sent to the control unit 60 sent, and that to the coil 48 supplied power is in the control unit 60 adapted so that a value of the mold clamping force assumes a set value. Accordingly, a feedback control is carried out. During this time, one in the injector 17 molten resin from the injector 18 injected and each of the cavities of the molding apparatus 19 is filled with the resin.
  • When the resin filled in each of the cavities is cooled and cured, the mold opening / closing processor controls 61 a mold opening process. The mold clamping processor 62 stops the supply of electricity to the coil 48 in the state in 1 is shown. Accordingly, the linear motor becomes 28 so driven that the movable plate 12 is withdrawn and the movable mold 16 is positioned at a retreat limit position, as in FIG 2 shown. As a result, the mold is opened.
  • The mold closing process and the mold clamping process will be described in more detail. 3 FIG. 14 is a view illustrating the operation of the mold clamping apparatus in the mold closing process and the mold clamping process. Four dashed or curved lines are shown in a diagram that is in 3 is shown. The horizontal axis of the graph is common to the dashed or arc lines and represents the time (elapsed time). The vertical axis of the graph varies according to the dashed and curved lines, respectively.
  • A solid line "a" represents a torque output limit (limit value) of the linear motor 28 ie, the output of the mold opening / closing processor 61 the control unit 60 , As for the solid line "a", the vertical axis represents a torque value. The dashed line "b" represents the position of the movable plate 12 represented by the linear motor 28 is moved. As for the dashed line "b", the vertical axis represents the position. The broken line "c" represents a command value of the mold clamping force provided by the mold clamping processor 62 the control unit 60 is issued. A dashed-dotted line "d" represents an actual value of the mold clamping force generated by the load detector 55 is detected. As for the dashed lines "c" and "d", the vertical axis represents the strength of the mold clamping force.
  • In the diagram of 3 A time period between times t 1 and t 2 corresponds to the mold closing process. Ie. the mold clamping device 10 is located in the 2 shown state at the time t 1 and is located in the in 1 shown state at time t 2 .
  • In 3 The mold closing process includes a lift section and a low pressure section. When power to the coil 35 at time t 1 based on the control of the mold opening / closing processor 61 is delivered, the movement section is started. In the moving section, a command to open (maximize) the torque output limit in the linear motor 28 from the mold opening / closing processor 61 as shown by the solid line "a". As a result, as shown by the broken line "b", the movable plate 12 moving forward (toward a mold touch position) at a high speed. In addition, the gap δ between the rear plate 13 and the attraction plate 22 also reduced by the same amount as the distance the linear motor 28 moved forward. It is possible to shorten a molding cycle by causing the movable plate 12 moved at a high speed in one movement period. Accordingly, it is possible to increase the productivity.
  • When it detects that the position of the movable plate 12 reaches a predetermined low pressure start position (start position of the low pressure portion), the mold opening / closing processor gives 61 a command in the linear motor 28 to decrease (decrease) the torque output limit to a preset torque value (low-pressure torque). Meanwhile, a posi tion detector, such as an encoder (not shown) in the linear motor 28 intended. The information indicating the position of the linear motor 28 represents (ie the position of the movable plate 12 ), is in the control unit 60 entered from the position detector.
  • When the torque output limit is lowered, mold breakage is prevented when foreign matter is trapped between the molds. Accordingly, the movable plate becomes 12 slows down (the feed rate is reduced) as shown by the dashed line "b". While the movable plate 12 (Linear motor 28 ) is slowed down sufficiently, so that the molding device 19 or the like does not break, the position of the movable platen is controlled. When a mold clamping start position is reached at time t 2 , the movable plate is stopped in accordance with the position control.
  • The period after time t 2 corresponds to the mold clamping process. When the mold clamping using the electromagnet 49 is executed, here the gap δ is reduced by an electromagnetic force, so that a mold clamping force is generated. Accordingly, when an electromagnetic force is generated, the gap δ is set to a large value. For this reason, until a predetermined mold clamping force is generated between the molds after current to the electromagnet 49 is delivered, the response is low and takes time. Meanwhile, an ultrahigh-precision molding method is used which injects a resin before the molds completely contact each other. When an electromagnetic force in the mold clamping device 10 using the electromagnet 49 is generated, the gap δ of the open molding is larger than that of the ordinary molding. For this reason, the time is taken until a mold clamping force is generated. In this case, the mold clamping process starts just after an electromagnetic force is generated while the molds are not touching each other. In view of this, the "mold touch position" of this embodiment indicates the position of the movable platen 12 where the mold clamping process begins, regardless of whether the molds touch each other.
  • As shown by the dashed line "c", the mold clamping processor gives 62 command to generate a constant mold clamping force at the mold touch position (time t 2 ). The rated current is applied to the coil 48 of the electromagnet 49 delivered in accordance with the command, so that an electromagnetic force in the gap δ between the rear plate 13 and the attraction plate 22 is produced. Accordingly, as shown by the dashed-dotted line "d", the flow through the electromagnet 49 generated electromagnetic force increases and the mold clamping force is also increased. As the mold clamping force increases, the movable plate becomes 12 further advanced and the movable form 16 is determined by the fixed shape 15 touched at time t 4 . Accordingly, the mold is completely closed. In this case, the filled resin is compressed while the distance between the mold is reduced in open molding. As shown by the dashed-dotted line "d", the mold clamping force is further increased in the following and reaches a rated mold clamping force at time t 5 . Thereafter, the nominal mold clamping force is maintained in the mold clamping process. Until the mold clamping force reaches the rated mold clamping force between times t 2 and t 5 , the portion corresponds to a pressure increase process in the mold clamping process.
  • Meanwhile, even after the movable platen reaches the mold touch position, the mold opening / closing processor moves 61 continue to supply electricity to the coil 35 of the linear motor 28 to deliver to the position of the movable plate 12 to maintain at the mold touch position. However, after the movable plate reaches the mold contact position as shown by the solid line "a", the torque output limit is reduced by the cogging torque with a torque (holding torque) where the positional deviation of the linear motor 28 is prevented. Although the resin is filled into the open mold, the output of the linear motor is 28 further capable of withstanding the pressure of the filled resin, so that the linear motor 28 not moved back.
  • When the mold clamping force generated by the solenoid is increased and a force becomes the cogging torque of the linear motor 28 ignored (ie, when the mold clamping force is greater than a force due to the cogging torque) (time t 3 in FIG 3 ), controls the mold opening / closing processor 61 variable the supply of electricity to the coil 35 of the linear motor 28 , More specifically, the mold opening / closing processor stops the supply of power. Accordingly, the mold clamping force does not become by controlling the position of the linear motor 28 affected. The timing for stopping the supply of electricity to the coil 35 can not be based on the shape clamping force, but on the elapsed time. Ie. the time until the mold clamping force becomes larger than the cogging torque force after the mold clamping force has started to be calculated can be calculated in advance or can be obtained by an empirical value, the supply of electricity can be made during a period corresponding to that time and Supply of electricity can be stopped after the period has expired. Even in the case of open-forming, at By injecting a resin before the molds fully contact one another, it may be possible to prevent the leakage of a resin between the movable and stationary molds 16 and 15 to prevent by continuing to supply power to the linear motor 28 until a mold clamping force is generated which is greater than the output of the linear motor 28 is, after generation of the electromagnetic force, as described above.
  • Meanwhile, the torque output limit of the linear motor 28 be reduced in phases of the movement section, the low-pressure section and the mold clamping process.
  • As described above, according to the mold clamping device 10 This embodiment, even after the mold clamping process begins (the mold clamping force is increased) current to the linear motor 28 is supplied so that the position of the movable plate is controlled to reach the mold touch position. Accordingly, it is possible to prevent the deviation from the mold touch position caused by the cogging torque of the linear motor 28 and further to generate the mold clamping force corresponding to a predetermined position (mold touch position). As a result, it is possible to reduce occurrence of molding errors and the like.
  • In this embodiment, the solenoid is 49 at the rear end surface of the rear plate 13 formed and the attraction part 51 is at the front end face of the attraction plate 22 provided to the solenoid 49 to assign and to be able to move freely forward and backward. However, the attraction part may be on the rear end surface of the rear plate 13 be provided and the electromagnet may be on the front end surface of the attraction plate 22 be provided to point to the attraction part and to be able to move freely forward and backward.
  • Meanwhile, in the method of controlling the mold clamping apparatus according to this embodiment, the mold clamping apparatus does not need to be mold opening / closing by the drive of the linear motor 28 To run. In particular, as a magnet of the linear motor 28 is exposed to the surface of the frame, there are concerns that dust will adhere to the magnet. Accordingly, a modification in the 4 shown using a rotating motor, which covers a magnetic field generating area by a motor frame without the linear motor 28 is used as the mold opening / closing drive unit.
  • Since the description of a solenoid unit as a second drive unit is the same as that in FIG 1 and 2 shown electromagnet, the description of the solenoid unit is omitted in the following. A mold opening / closing motor 74 which functions as a first drive unit and a drive unit for opening and closing the mold (mold opening / closing drive unit) are immovable on a motor mount 73 attached, which is attached to the frame. Here, a rotating motor that delimits a magnetic field generating area by a motor frame is called a mold opening / closing motor 74 used. A motor shaft (not shown) protrudes from the rotating motor and the motor shaft is provided with a ball screw shaft 72 coupled. A ball nut 71 is threaded through the ball screw shaft 72 mounted, whereby a moving direction conversion unit is formed, which converts the rotational movement of the rotating motor in a linear movement BeWe. Further, the ball nut 71 immovable on a flange 12a attached to the movable plate, that of the lower part of the movable plate 12 projects. When the mold opening / closing motor 74 is driven, accordingly, the movable plate 12 moved forward and backward. As a result, the mold opening / closing operation of the movable mold 16 be executed.
  • As a position detector 75 at the rear end of the mold opening / closing motor 74 is attached, it is possible to control the rotation angle of the mold opening / closing motor 74 read and the position of the movable plate 12 to detect. Accordingly, the mold opening / closing processor controls 61 the mold opening / closing motor 74 ,
  • In this structure, when there is no concern that a positional deviation of the shape is generated by the electromagnet while a mold clamping force is applied to the molding apparatus 19 More specifically, after starting to increase the pressure, the mold opening / closing processor controls 61 the supply of power to the mold opening / closing motor 74 variable. More specifically, the mold opening / closing processor stops supplying power. Accordingly, the mold clamping force does not become by controlling the position of the mold opening / closing motor 74 affected.
  • embodiments of the invention have been described. However, the invention is not limited to the above-mentioned specific embodiments and there may be various modifications and changes be made without the scope and concept of the invention to leave, which are described in the claims.
  • The international application claims the priority of international, Japanese godparents Application No. 2007-134623 , submitted on 1 May 2007, the entire contents of which ( Japanese Patent Application No. 2007-134623 ) is incorporated by reference in this international application.
  • SUMMARY
  • A Mold clamping device comprises an electromagnet, which drives a mold clamping or mold closing operation and a mold opening / closing drive unit. The Mold opening / closing drive unit becomes variable controlled while a Formklemm- or Formschließkraft generated by the electromagnet. In this way it is possible to provide a mold clamping device, the accuracy the position for generating the mold clamping force in conjunction with the mold opening / closing drive unit can improve.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • WO 05/090052 [0006]
    • - JP 2007-134623 [0072, 0072]

Claims (14)

  1. A mold clamping device, having an electromagnet, the a Formklemm- or mold closing operation drives, and a mold opening / closing drive unit, wherein the mold clamping device comprises: a Mold opening / closing drive unit, which is variable is controlled while a Formklemm- or Formschließkraft generated by the electromagnet.
  2. Mold-closing device according to claim 1, wherein the mold opening / closing drive unit a linear motor is, and current, for position control is supplied to the linear motor, during a pressure increase process performed by the electromagnet becomes.
  3. Mold-closing device according to claim 1, wherein the mold opening / closing drive unit a rotating motor, and power for position control used, is supplied to the rotating motor, namely during a pressure increase process by the electromagnet is performed.
  4. Mold-closing device according to claim 1, where the current is supplied to the linear motor until the through the electromagnet generated Formklemm- or mold clamping force reaches a predetermined value.
  5. Mold-closing device according to claim 4, wherein the predetermined value is greater than the Value of a cogging torque of the linear motor is.
  6. Mold-closing device according to claim 4, wherein the supply of power to the linear motor is stopped, after the mold clamping force reaches the predetermined value.
  7. Mold-closing device according to claim 1, wherein the current in a predetermined period of time after the Form clamping force is generated by the electromagnet, to the linear motor is delivered.
  8. A method of controlling a mold clamping device, which comprises an electromagnet which drives a mold clamping operation, as well as a mold opening / closing drive unit, wherein the method comprises: variable control of the mold opening / closing drive unit while a mold clamping force generated by the electromagnet becomes.
  9. A method according to claim 8, wherein the mold opening / closing drive unit Linear motor is, and current, for position control used is supplied to the linear motor while a pressure increase process performed by the electromagnet becomes.
  10. A method according to claim 8, wherein Mold opening / closing drive unit a rotating one Engine is, and power used for position control is delivered to the rotating engine while a Pressure increase process performed by the electromagnet becomes.
  11. A method according to claim 8, wherein Power is supplied to the linear motor until the mold clamping force, which is generated by the electromagnet, a predetermined value reached.
  12. The method of claim 11, wherein the predetermined value is greater than a value of Cogging torque of the linear motor is.
  13. The method of claim 11, wherein the supply of electricity to the linear motor is stopped after the Form clamping force has reached the predetermined value.
  14. A method according to claim 8, wherein Power delivered to the linear motor in a predetermined period of time after the mold clamping force is generated by the electromagnet becomes.
DE200811001353 2007-05-21 2008-05-21 Mold clamping device and method for controlling the mold clamping device Withdrawn DE112008001353T5 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2007-134623 2007-05-21
JP2007134623 2007-05-21
PCT/JP2008/059315 WO2008143277A1 (en) 2007-05-21 2008-05-21 Mold clamping device and mold clamping device control method

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JP5774443B2 (en) * 2011-10-21 2015-09-09 住友重機械工業株式会社 injection molding machine
JP5774441B2 (en) * 2011-10-21 2015-09-09 住友重機械工業株式会社 Injection molding machine and mold thickness adjusting method for injection molding machine
JP5749153B2 (en) 2011-12-26 2015-07-15 住友重機械工業株式会社 injection molding machine
JP5889630B2 (en) 2011-12-26 2016-03-22 住友重機械工業株式会社 Injection molding machine
JP5778023B2 (en) 2011-12-26 2015-09-16 住友重機械工業株式会社 injection molding machine
JP2013136213A (en) * 2011-12-28 2013-07-11 Sumitomo Heavy Ind Ltd Injection molding machine
JP5897933B2 (en) * 2012-03-01 2016-04-06 住友重機械工業株式会社 Injection molding machine
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JP5000714B2 (en) 2012-08-15
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WO2008143277A1 (en) 2008-11-27
TWI359731B (en) 2012-03-11

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