JP5361053B2 - Mold clamping device and its control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die clamping device ensuring brake operation. <P>SOLUTION: The die clamping device 3 of a die cast machine 1 has a fixed die plate 11 for holding a fixed die 503, and a movable die plate 13 which holds a movable die 505 and is movable in the die opening/closing direction with respect to the fixed die plate 11. The die clamping device 3 has a motor 23 generating the driving force for driving the movable die plate 13, a brake 28 for braking the motor 23 by the friction resistance, and a motor sensor 67 for detecting the operation of the motor 23. Further, the die cast machine 1 includes a control device 7 which outputs the control signal for causing the motor 23 to generate the driving force while the braking force is demonstrated by the brake 28, and determines presence/absence of any abnormality in the brake 28 based on the result of detection of the motor sensor 67 in that condition. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mold clamping device of a molding machine such as a die casting machine and a control device thereof.

  In a vertical mold clamping device, a technique for preventing a movable die plate from dropping by a brake is known (for example, Patent Document 1). In a horizontal mold clamping apparatus, it is common to restrict the movement of a movable die plate by a safety hook at a mold opening position (for example, Patent Document 2). Further, a technique using a dynamic brake in a horizontal mold clamping device that drives a movable die plate by a motor (electric motor) is also known (Patent Document 3).

JP 10-291239 A Japanese Utility Model Publication No. 6-5752 JP-A-11-235744

  In Patent Document 1 and the like, it is assumed that the brake operates normally. However, Patent Document 1 and the like do not mention a technique for ensuring that the brake operates normally.

  An object of the present invention is to provide a mold clamping device and a control device thereof that can guarantee the operation of a brake.

  The mold clamping apparatus of the present invention includes a fixed die plate that holds a fixed mold, a movable die plate that holds a movable mold and is movable in a mold opening / closing direction with respect to the fixed die plate, and the movable die plate. A driving source that generates a driving force to be driven; a brake that can brake the driving source by frictional resistance; a sensor that can detect an operation of the driving source; and the brake source that exhibits the braking force. And a control device that outputs a control signal for generating a driving force and determines whether or not there is an abnormality in the brake based on a detection result of the sensor at that time.

  Preferably, the drive source is a motor.

  Preferably, the control device outputs, to the motor, a control signal that generates the same driving force as the driving force generated by the motor when the mold is closed in determining whether there is an abnormality.

  Preferably, the brake includes a contacted member driven by the motor, a contact member that can contact the contacted member, and an elastic force that presses the contact member against the contacted member. And a brake driving device capable of separating the contact member from the contacted member against an urging force of the elastic member.

  Preferably, the brake drive device is a hydraulic cylinder device.

  Preferably, a pump capable of supplying hydraulic fluid to the hydraulic cylinder device and capable of supplying hydraulic fluid to an injection cylinder device that drives an injection plunger that pushes a molding material to the movable mold and the fixed mold. Have.

  Suitably, the said control apparatus determines the presence or absence of abnormality of the electric power supply to the said motor, and when it determines with abnormality having arisen, it operates the said brake.

  Suitably, the said control apparatus determines the presence or absence of abnormality, when the said mold clamping apparatus is started.

  Preferably, the control device of the mold clamping device according to the present invention includes a fixed die plate that holds a fixed mold, and a movable die plate that holds the movable mold and is movable in a mold opening / closing direction with respect to the fixed die plate. A clamping device having a driving source for generating a driving force for driving the movable die plate, a brake capable of braking the driving source by frictional resistance, and a sensor capable of detecting the operation of the driving source. Then, in a state where the braking force is exerted on the brake, a control signal for generating the driving force is output to the driving source, and the presence or absence of abnormality in the brake is determined based on the detection result of the sensor at that time. .

  According to the present invention, the operation of the brake can be guaranteed.

Schematic which shows the structure of the principal part of the die-casting machine which concerns on embodiment of this invention. The figure which shows the structure of the brake of the die-casting machine of FIG. The block diagram which shows the structure of the drive processing system in the die-casting machine of FIG. The flowchart which shows the procedure of the brake abnormality diagnosis process which the control apparatus of FIG. 3 performs. The flowchart which shows the procedure of the brake abnormality presence determination process which a control apparatus performs in step S13 of FIG. Sectional drawing which shows the structure of the brake which concerns on the modification of this invention.

  FIG. 1 is a schematic view showing a configuration of a die casting machine 1 according to an embodiment of the present invention in a mold closed state.

  The die casting machine 1 controls a mold clamping device 3 for opening and closing the mold 501, an injection device 5 for injecting a molten metal (molten metal) ML as a molding material into the mold 501, and controlling these operations. Control device 7 (see FIG. 3). In addition, although not particularly illustrated, the die casting machine 1 has an extrusion device for extruding a die casting product as a molded product from the mold 501.

  The mold 501 includes a fixed mold 503 and a moving mold 505 that are arranged to face each other. The moving mold 505 is moved by the mold clamping device 3 in the facing direction (mold opening / closing direction: right and left direction in FIG. 1) with respect to the fixed mold 503. That is, the mold is opened and closed. The mold clamping device 3 is, for example, a so-called horizontal mold clamping device, and the mold opening / closing direction is a horizontal direction. When the fixed mold 503 and the moving mold 505 are brought into contact (mold closing), a cavity Ca for forming a die-cast product is formed between the fixed mold 503 and the moving mold 505.

  The mold clamping device 3 includes, for example, a base 9, a fixed die plate 11 that holds a fixed die 503, a moving die plate 13 that holds a moving die 505, and a plurality of penetrating through these die plates (11, 13). Tie bar 15.

  The fixed die plate 11 is fixed on the base 9. The movable die plate 13 is provided on the base 9 so as to be movable in the mold opening / closing direction. More specifically, the movable die plate 13 is slidable on the base 9 between the mold closing position shown in FIG. 1 and the mold opening position moved to the left side of FIG. As the moving die plate 13 moves, the fixed mold 503 and the moving mold 505 are opened and closed (open and closed).

  The plurality of tie bars 15 are provided at, for example, four corners of the die plate (11, 13). In the mold closed state, one end of the plurality of tie bars 15 is fixed to one of the two die plates (11, 13) (the movable die plate 13 in this embodiment), and the other end is pulled in the extending direction of the plurality of tie bars 15. It is done. Thereby, the contact pressure of the fixed mold 503 and the movable mold 505 is increased according to the extension amount of the tie bar 15. That is, mold clamping is performed.

  The mold clamping device 3 is configured, for example, as a so-called composite mold clamping device, and includes a moving mechanism 17 mainly used for mold opening / closing and a mold clamping cylinder device 19 mainly used for mold clamping as drive devices. Have. The mold clamping device 3 also has a tie bar nut 21 for performing mold clamping in cooperation with the mold clamping cylinder device 19.

  The moving mechanism 17 is provided, for example, inside the base 9. The moving mechanism 17 includes a motor 23 fixed to the base 9, a screw shaft 25 that is rotationally driven by the motor 23, and a moving nut 27 that is screwed to the screw shaft 25. Further, the moving mechanism 17 has a brake 28 for braking the motor 23 (moving die plate 13).

  Although not specifically shown, the motor 23 includes a stator that constitutes one of a field and an armature, and a rotor that constitutes the other of the field and the armature and rotates with respect to the stator. The motor 23 may be a direct current motor or an alternating current motor.

  The screw shaft 25 is pivotally supported on the base 9. The screw shaft 25 is connected to the output shaft of the motor 23 directly or indirectly through a transmission mechanism such as a gear mechanism, and rotates according to the rotation of the motor 23.

  The moving nut 27 is fixed to the moving die plate 13. The rotation of the motor 23 is converted into a translational motion by the screw shaft 25 and the moving nut 27 and transmitted to the moving die plate 13. Thereby, the movable die plate 13 moves in the mold opening / closing direction.

  The mold clamping cylinder device 19 is provided on the fixed die plate 11. The mold clamping cylinder device 19 includes a mold clamping cylinder 29 built in the fixed die plate 11 and a mold clamping piston 31 that can slide in the mold clamping cylinder 29.

  The mold clamping piston 31 divides the interior of the mold clamping cylinder portion 29 into two cylinder chambers and is fixed to the tie bar 15. The mold clamping cylinder device 19 generates driving force by selectively supplying hydraulic fluid to the two cylinder chambers.

  The tie bar nut 21 is provided on the movable die plate 13. The tie bar nut 21 is constituted by a half nut, for example, and is opened and closed by a cylinder device (not shown). An engaged portion 15 a that can be engaged with the tie bar nut 21 is formed at the end of the tie bar 15 on the moving die plate 13 side. As the tie bar nut 21 and the engaged portion 15a are engaged or released, the movable die plate 13 and the tie bar 15 are engaged or released.

  In a state where the movable die plate 13 and the tie bar 15 are engaged with each other by the tie bar nut 21, the working fluid is supplied to the mold clamping cylinder device 19 and the mold clamping piston 31 is placed on the back side of the fixed die plate 11 (the right side in FIG. 1). The mold is clamped by moving to.

  The injection device 5 includes, for example, a sleeve 33 that communicates with the cavity Ca, an injection plunger 35 that can slide in the sleeve 33, and an injection cylinder device 37 that drives the injection plunger 35.

  The molten metal is supplied into the sleeve 33 by a ladle (not shown) and the injection plunger 35 moves forward in the sleeve 33 toward the cavity Ca, whereby the molten metal ML is injected and filled into the cavity Ca.

  The injection cylinder device 37 includes an injection cylinder tube 39, an injection piston 41 (see FIG. 3) that can slide in the injection cylinder tube 39, and an injection piston rod 43 that is fixed to the injection piston 41.

  The injection piston 41 divides the inside of the injection cylinder tube 39 into two cylinder chambers. The injection piston rod 43 is fixed to the injection plunger 35 via a coupling 45. By selectively supplying hydraulic fluid to the two cylinder chambers of the injection cylinder tube 39, the injection plunger 35 is driven.

  FIG. 2 is a diagram illustrating a configuration of the brake 28.

  The brake 28 is configured by, for example, a so-called disc brake, and includes a disc 47 that rotates together with the motor 23, a pad 49 that can contact the disc 47, and a holding device 51 that supports the pad 49. Yes.

  The disk 47 is fixed to the screw shaft 25, for example. The pads 49 are provided on both sides of the disk 47, for example. The holding device 51 is supported by the base 9, holds the pad 49, and can be driven in a direction to approach and separate the pad 49 from the disk 47.

  The braking force acts on the disk 47 by the frictional resistance generated by the pad 49 coming into contact with the disk 47, and the motor 23 and the movable die plate 13 are braked. Further, when the pad 49 is separated from the disk 47, the braking force acting on the disk 47 is released.

  Moreover, the brake 28 is comprised by the hydraulic brake which drives the pad 49 with a hydraulic device, for example. Furthermore, the brake 28 is configured by, for example, a reverse operation release brake that exerts a braking force when power is not supplied by the hydraulic device and releases the braking force when power is supplied. Specifically, it is as follows.

  The holding device 51 has two driving units 53 corresponding to the two pads 49. The two drive units 53 have a base 54 that is shared with each other. The base 54 is fixed to the base 9. Each drive unit 53 includes a brake cylinder device 55 and an elastic member 57.

  The brake cylinder device 55 includes a brake cylinder part 59 formed by the base 54, a brake piston 61 that can slide in the brake cylinder part 59, and a brake piston rod 63 that is fixed to the brake piston 61. .

  The brake piston 61 divides the interior of the brake cylinder portion 59 into a rod side chamber 60A on the side from which the brake piston rod 63 projects and a head side chamber 60B on the opposite side. The brake piston rod 63 is fixed to the pad 49.

  The elastic member 57 is configured by, for example, a leaf spring (disc spring). A pressing member 65 that is movable with respect to the base 54 is in contact with or fixed to the head side chamber 60B side of the brake piston 61. The elastic member 57 biases the pressing member 65 toward the brake piston 61 side.

  The pad 49 is pressed against the disk 47 by the urging force of the elastic member 57. Further, the hydraulic fluid is supplied to the rod side chamber 60 </ b> A, and the brake piston 61 is driven toward the head side chamber 60 </ b> B against the biasing force of the elastic member 57, whereby the pad 49 is separated from the disk 47.

  FIG. 3 is a block diagram showing the configuration of the drive processing system of the die casting machine 1.

  The motor 23 is constituted by a servo motor, for example. That is, the motor 23 is provided with a motor sensor 67 such as an encoder that detects the rotation of the motor 23, and the detected value is input to a servo driver (servo amplifier) 69. The servo driver 69 performs feedback control of the motor 23 based on the comparison between the detection value input from the motor sensor 67 and the command value (control signal) input as appropriate.

  In order to drive the brake cylinder device 55, the die casting machine 1 includes a pump 71 that can send hydraulic fluid, a brake side direction control valve 73 that controls the flow of hydraulic fluid from the pump 71, and a brake side direction control valve 73. And a brake control circuit 75 for controlling the motor.

  The pump 71 may be a rotary pump that discharges hydraulic fluid by rotation of a rotor such as a gear pump or a vane pump, or discharges hydraulic fluid by reciprocation of a piston such as an axial plunger pump or a radial plunger pump. A plunger pump may be used.

  The brake-side direction control valve 73 is for performing either the allowance of the flow from the pump 71 to the rod-side chamber 60A and the blocking of the flow. More specifically, for example, the brake side direction control valve 73 is constituted by a switching valve with 4 ports and 2 positions, and operates as follows.

  In the neutral position, the brake side direction control valve 73 prohibits the flow from the pump 71 to the rod side chamber 60A, discharges hydraulic fluid from the rod side chamber 60A to the tank 72, and hydraulic fluid from the tank 72 to the head side chamber 60B. Allow flow. At this time, the brake piston 61 is moved to the rod side chamber 60 </ b> A side by the elastic member 57, and the pad 49 is pressed against the disk 47.

  When the brake side direction control valve 73 is switched from the neutral position to another position, the brake side direction control valve 73 permits the flow from the pump 71 to the rod side chamber 60A and allows the hydraulic fluid to be discharged from the head side chamber 60B to the tank 72. At this time, the brake piston 61 moves toward the head side chamber 60 </ b> B against the urging force of the elastic member 57, and the pad 49 is separated from the disk 47.

  For example, the brake-side direction control valve 73 generates an electromagnetic force when electric power is supplied, and is switched from the neutral position to another position by the electromagnetic force. Further, the brake-side direction control valve 73 is returned to the neutral position by the spring force when power is not supplied.

  The brake control circuit 75 supplies or shuts off electric power to the brake side direction control valve 73 in accordance with appropriately input control signals, and switches the position of the brake side direction control valve 73.

  The pump 71 may be shared by a plurality of hydraulic cylinder devices or the like. For example, the pump 71 is connected to the injection cylinder device 37 via the injection side direction control valve 77. The injection side direction control valve 77 is constituted by, for example, a four-port three-position switching valve. The injection side directional control valve 77 blocks the flow from the pump 71 to the injection cylinder device 37, allows the flow from the pump 71 to one cylinder chamber of the injection cylinder device 37, and the other of the injection cylinder device 37 from the pump 71. To allow flow into the cylinder chamber.

  The control device 7 includes a power supply circuit 79 that supplies power to each unit such as the servo driver 69 and the brake control circuit 75, and a main control unit 81 that outputs a control signal to each unit such as the servo driver 69 and the brake control circuit 75. doing.

  The power supply circuit 79 includes, for example, a transformer. The power supply circuit 79 converts electric power supplied from a commercial power supply into an appropriate voltage and supplies it to each part of the die casting machine 1. A power off switch 83 and a power on switch 85 are connected to the power supply circuit 79 in order to allow or block power supply from the commercial power supply to the power supply circuit 79.

  The main control unit 81 includes, for example, a CPU, a ROM, a RAM, and the like. The main control unit 81 outputs a control signal to the servo driver 69, the brake control circuit 75, and the display unit 89 based on a predetermined program or a user operation on the input unit 87. Thereby, the motor 23, the brake 28, and the display unit 89 are driven.

  As described above, the control signal input from the main control unit 81 to the servo driver 69 is converted into electric power of an appropriate magnitude by the servo driver 69 and supplied to the motor 23. Accordingly, the electric power output from the servo driver 69 to the motor 23 can be regarded as a control signal output from the main control unit 81 to the motor 23. In the present application, the control signal from the main control unit 81 to the servo driver 69 and the power from the servo driver 69 to the motor 23 may be referred to without any particular distinction.

  In addition to the configuration described above, the control device 7 includes a brake diagnosis circuit 91 and a power failure detection circuit 93 in order to guarantee the operation of the brake 28.

  The brake diagnosis circuit 91 instructs the abnormality determination circuit 95 of the main control unit 81 to perform an operation for diagnosing the brake 28. When the instruction is given, the abnormality determination circuit 95 performs predetermined control on the motor 23 and the brake 28 and determines whether there is an abnormality in the brake 28 based on the detection signal from the motor sensor 67 at that time. judge. This process will be described later.

  The die casting machine 1 includes a brake diagnosis on switch 97 and a brake diagnosis on circuit 99 in order to instruct the brake diagnosis circuit 91 to diagnose the brake 28.

  The brake diagnosis on switch 97 is operated at any time by the user, and outputs an on signal to the brake diagnosis circuit 91 according to the operation. When an ON signal is input from the brake diagnosis ON switch 97, the brake diagnosis circuit 91 instructs the abnormality determination circuit 95 to perform diagnosis.

  The brake diagnosis ON circuit 99 outputs an ON signal to the brake diagnosis circuit 91 in the same manner as the brake diagnosis ON switch 97 when power is supplied to the power supply circuit 79 (when the die casting machine 1 is activated). Note that the brake diagnosis ON circuit 99 can be set as to whether or not to give a diagnosis instruction at the time of activation by an operation on the input unit 87.

  In the die-casting machine 1 of the present embodiment, the brake 28 is constituted by a reverse operation release type brake. Therefore, when the power supply to each part is cut off due to a power failure or disconnection, the brake 28 operates. .

  However, if a break occurs between the power supply circuit 79 and the motor 23 and only the motor 23 is disconnected from the power supply, the brake 28 does not operate. Therefore, the power failure detection circuit 93 determines whether or not there is an abnormality in the power supply from the power supply circuit 79 to the motor 23. If it is determined that an abnormality has occurred, the power failure detection circuit 93 controls the brake control circuit 75 to operate the brake 28.

  For example, the power failure detection circuit 93 monitors the amount of power at the time when the motor 23 should be driven at any position of the wiring from the power supply circuit 79 to the motor 23 to determine whether there is an abnormality.

  In FIG. 3, the names of the circuits are given to the respective units of the control device 7. However, this is merely a method for convenience of explanation, and the CPU of each unit of the control device 7 is stored in a ROM or the like. It may be configured by executing a program.

  Next, the operation of the die casting machine 1 will be described.

  In the die casting machine 1, first, the moving mechanism 17 drives the moving die plate 13 from the mold opening position to the fixed die plate 11 side, and performs mold closing to bring the moving mold 505 into contact with the fixed mold 503. Next, the mold clamping cylinder device 19 performs mold clamping to increase the contact pressure between the movable mold 505 and the fixed mold 503.

  Thereafter, the injection plunger 35 is driven by the injection cylinder device 37, and the molten metal is injected and filled into the cavity Ca. When a certain period of time elapses, in other words, when the molten metal is solidified to form a molded product, the moving die plate 13 is driven to the opposite side of the fixed die plate 11 by the moving mechanism 17 to open the mold. . At this time, the molded product moves together with the moving mold 505 and is released from the fixed mold 503. Then, the molded product is extruded from the moving mold 505 by an unillustrated extrusion device. The die casting machine 1 repeats such a molding cycle.

  The brake 28 is used at an appropriate timing. For example, the brake 28 operates when the movable die plate 13 is in the mold open position in a repeated molding cycle. In addition, for example, the brake 28 operates when a door (not shown) that allows or prohibits the worker from entering the die casting machine 1 is opened. By operating the brake 28 in this way, an unintended operation of the movable die plate 13 is suppressed, and safety is improved.

  In the die casting machine 1, the brake 28 is diagnosed at an appropriate time in order to guarantee the operation of the brake 28.

  FIG. 4 is a flowchart showing a procedure of brake abnormality diagnosis processing executed by the control device 7. As described above, this processing is executed when the user operates the brake diagnosis on switch 97 at an arbitrary time or when the die casting machine 1 is started.

  In step S11, the control device 7 operates the brake 28. Specifically, the control device 7 stops the power supply from the brake control circuit 75 to the brake side direction control valve 73 by stopping the output of the control signal to the brake control circuit 75. The brake side direction control valve 73 is in a neutral position by a spring force, and the flow of hydraulic fluid from the pump 71 to the brake cylinder device 55 is blocked. Then, the pad 49 is pressed against the disk 47 by the urging force of the elastic member 57.

  In step S <b> 12, the control device 7 starts outputting a control signal for driving the motor 23. The control signal at this time is, for example, a control signal that generates a driving force equivalent to the driving force generated by the motor 23 when the mold is closed.

  In step S13, the control device 7 determines whether or not the brake 28 is abnormal.

  FIG. 5 is a flowchart illustrating a procedure of a brake abnormality presence / absence determination process executed by the control device 7 in step S13.

  In steps S11 and S12, in the die casting machine 1, a control signal for driving the motor 23 is output in a state where the braking force of the brake 28 is exerted. Therefore, if an abnormality occurs in the brake 28, the motor 23 rotates. More specifically, for example, since the present embodiment is a reverse operation release type brake, if the elastic member 57 is damaged, the motor 23 rotates.

  Therefore, in step S21, the control device 7 determines whether or not the motor 23 has rotated based on the detection signal of the motor sensor 67. If the control device 7 determines that the motor 23 is not rotating, the control device 7 regards the brake 28 as normal and stores it in the RAM or the like (step S22). Conversely, if it is determined that the motor 23 has rotated, the control device 7 regards that the brake 28 has become abnormal, and stores that fact in the RAM or the like (step S23). Then, the process ends.

  Returning to the description of FIG. In step S14, the control device 7 determines whether or not a predetermined braking time has elapsed since the motor 23 was started. If it is determined that the braking time has not elapsed, the control device 7 executes Step S13 again. The braking time is preferably set to be relatively short in order to reduce the load on the motor 23 and the brake 28.

  If it is determined that the braking time has elapsed, the control device 7 stops outputting the control signal for driving the motor 23 (step S15). And the control apparatus 7 displays the determination result in step S13 on the display part 89 (step S16), and complete | finishes a process.

  According to the above embodiment, the mold clamping device 3 of the die casting machine 1 holds the fixed die plate 11 that holds the fixed die 503 and the movable die 505, and in the mold opening / closing direction with respect to the fixed die plate 11. The movable die plate 13 is movable. The mold clamping device 3 includes a motor 23 that generates a driving force for driving the movable die plate 13, a brake 28 that can brake the motor 23 by frictional resistance, and a motor sensor 67 that can detect the operation of the motor 23. Have. Further, the die casting machine 1 outputs a control signal for causing the motor 23 to generate a driving force in a state in which the braking force is exerted on the brake 28, and an abnormality in the brake 28 is determined based on the detection result of the motor sensor 67 at that time. A control device 7 for determining the presence or absence of

  Accordingly, unintended movement of the movable die plate 13 can be suppressed by the brake 28 to improve safety, and the operation of the brake 28 can be guaranteed, thereby further improving safety.

  A drive source for driving the movable die plate 13 is a motor 23. Therefore, it is easy to apply a known technique such as a disc brake or a drum brake as a brake. Further, since the driving force can be adjusted only by changing the control signal, it is easy to set the driving force at the time of diagnosis of the brake 28 to an appropriate magnitude.

  The control device 7 outputs to the motor 23 a control signal that generates the same driving force as the driving force generated by the motor 23 when the mold is closed in determining whether there is an abnormality. In this case, the effectiveness of the brake 28 can be diagnosed within a necessary and sufficient range.

  The brake 28 includes a disk 47 driven by the motor 23, a pad 49 that can come into contact with the disk 47, an elastic member 57 that presses the pad 49 against the disk 47, and a pad that resists the urging force of the elastic member 57. And a brake cylinder device 55 capable of separating 49 from the disk 47. That is, the brake 28 is a reverse operation release type brake. Therefore, the movement of the movable die plate 13 can be suppressed by exerting a braking force even at the time of a power failure or disconnection. And the control apparatus 7 can detect the failure | damage etc. of the elastic member 57 by determination of the presence or absence of abnormality mentioned above.

  Since the brake drive device (brake cylinder device 55) that drives the pad 49 in the direction of separating from the disk 47 is a hydraulic cylinder device, it is easy to obtain a drive force that resists the urging force of the elastic member 57. It is. As a result, for example, the braking force can be increased by using the elastic member 57 having a high elastic coefficient.

  The die casting machine 1 can supply hydraulic fluid to the brake cylinder device 55 and supply hydraulic fluid to an injection cylinder device 37 that drives an injection plunger 35 that pushes molten metal as a molding material to the moving mold 505 and the fixed mold 503. A pump 71 that can be supplied is provided. Therefore, a driving force for releasing the braking force is obtained from the shared pump 71, and the configuration of the die casting machine 1 is simplified. In addition, when the pump 71 is stopped for adjustment of the injection device 5 or the like, the brake 28 is automatically actuated to ensure work safety.

  The control device 7 determines whether there is an abnormality in the power supply to the motor 23, and operates the brake 28 when determining that an abnormality has occurred. Therefore, for example, when the wiring connected to the motor 23 is disconnected and the dynamic brake may not function effectively, the movable die plate 13 can be forcibly stopped to improve safety.

  The control device 7 determines whether there is an abnormality when the mold clamping device 3 is activated. Accordingly, it is possible to prevent a situation in which the movable die plate 13 is not braked due to a failure of the brake 28.

  In the above embodiment, the motor 23 is an example of the drive source of the present invention, the disk 47 is an example of the contacted member of the present invention, and the pad 49 is an example of the contact member of the present invention. The brake cylinder device 55 is an example of the brake drive device of the present invention.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The molding machine is not limited to a die casting machine. For example, the molding machine may be another metal molding machine, a plastic injection molding machine, or a molding machine that molds a material obtained by mixing wood powder with a thermoplastic resin or the like. Good. Further, the molding machine is not limited to horizontal mold clamping horizontal injection, and may be vertical mold clamping vertical injection or horizontal mold clamping vertical injection, for example.

  The drive source for driving the movable die plate is not limited to a motor, and may be a hydraulic device, for example.

  The brake is not limited to a disc brake, and may be a drum brake, for example. Further, the brake is not limited to a reverse operation release type that exerts a braking force when the power is cut off, and may exhibit a braking force when the power is supplied. The brake drive device that drives the contacted member is not limited to the hydraulic cylinder device. For example, an electromagnet may be used.

  FIG. 6 is a cross-sectional view showing a brake 128 according to a modification. The brake 128 is configured by an electromagnetic brake. Specifically, it is as follows.

  The brake 128 includes a disk 147 that rotates integrally with the output shaft of the motor 23, and a pad 149 that is disposed on one surface of the disk 147. The pad 149 is pressed against the disk 147 by an elastic member (coil spring in the figure) 157, and thereby a braking force is generated. The pad 149 is made of metal, and when the coil 155 is energized, the pad 149 is attracted to the coil 155 against the urging force of the elastic member 157. As a result, the braking force is released.

  In determining whether there is an abnormality, the control signal output from the control device to the motor is not limited to a signal that generates the same driving force as that generated by the motor when the mold is closed. For example, the control signal may generate a driving force that is smaller than the driving force when the mold is closed for the purpose of reducing the load on the motor and the brake, and to confirm that the brake is operated reliably. In addition, a driving force larger than the driving force at the time of mold closing may be generated.

  In determining whether there is an abnormality, the motor may be determined to be abnormal when the motor rotates even a little, or may be determined to be abnormal when a rotation of a predetermined amount or more has occurred during a predetermined braking time.

  The execution time of the determination of whether or not there is an abnormality is not limited to when starting up or when an operator instructs. For example, it may be performed every molding cycle or every predetermined cycle corresponding to a cycle of a plurality of molding cycles by automatically determining whether or not there is an abnormality at a predetermined time of the molding cycle.

  The device that indicates the determination result of the presence or absence of abnormality is not limited to the display device, and may be, for example, an alarm device that outputs a notification sound.

  DESCRIPTION OF SYMBOLS 3 ... Mold clamping apparatus, 7 ... Control apparatus, 11 ... Fixed die plate, 13 ... Moving die plate, 23 ... Motor (drive source), 28 ... Brake, 67 ... Sensor for motor, 503 ... Fixed mold, 505 ... Movement Mold.

Claims (9)

A fixed die plate for holding a fixed mold;
A movable die plate that holds a movable mold and is movable in a mold opening and closing direction with respect to the fixed die plate;
A driving source for generating a driving force for driving the movable die plate;
A brake capable of braking the drive source by frictional resistance;
A sensor capable of detecting the operation of the drive source;
A control device that outputs a control signal that causes the driving source to generate a driving force in a state where the braking force is exerted on the brake, and determines whether or not there is an abnormality in the brake based on a detection result of the sensor at that time; ,
A mold clamping device. The mold clamping device according to claim 1, wherein the drive source is a motor. The mold clamping apparatus according to claim 2, wherein the control device outputs a control signal to the motor that generates the same driving force as the driving force generated by the motor when the mold is closed in determining whether or not there is an abnormality. The brake is
A contacted member driven by the motor;
A contact member capable of contacting the contacted member;
An elastic member for pressing the contact member against the contacted member;
A brake drive device capable of separating the contact member from the contacted member against the biasing force of the elastic member;
The mold clamping device according to claim 2 or 3. The mold clamping device according to claim 4, wherein the brake driving device is a hydraulic cylinder device. 6. A pump capable of supplying hydraulic fluid to the hydraulic cylinder device and capable of supplying hydraulic fluid to an injection cylinder device that drives an injection plunger that pushes a molding material to the movable mold and the fixed mold. The mold clamping device described in 1. The mold clamping device according to any one of claims 2 to 6, wherein the control device determines whether there is an abnormality in power supply to the motor, and activates the brake when it is determined that an abnormality has occurred. . The mold clamping device according to any one of claims 1 to 7, wherein the control device determines whether or not there is an abnormality when the mold clamping device is activated. A fixed die plate for holding a fixed mold, a movable die plate for holding a movable mold and movable in a mold opening / closing direction with respect to the fixed die plate, and a drive source for generating a driving force for driving the movable die plate And a control device for a mold clamping device having a brake capable of braking the drive source by frictional resistance, and a sensor capable of detecting the operation of the drive source,
A mold clamping device that outputs a control signal for generating a driving force in the driving source in a state where the braking force is exerted on the brake, and determines whether or not there is an abnormality in the brake based on a detection result of the sensor at that time Control device.

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