JP2008230193A - Molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a mold-opening/closing mechanism from being damaged by making it impossible to perform an automatic molding operation when a mold thickness is adjusted after completion of automatic clamping increase in a molding machine which has the operation mode of automatic clamping increase for automatically setting a mold clamping force so as to obtain the force being input and set. <P>SOLUTION: In this molding machine, an automatic molding operation is inhibited when the mold thickness is adjusted after the mold clamping force is set by automatic clamping increase, and an alarm display is performed for inducing re-practice of automatic clamping increase. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a molding machine such as an injection molding machine or a die casting machine, and in particular, a molding having an automatic tightening operation mode for automatically setting a mold clamping force so as to obtain an input-set mold clamping force. The present invention relates to a technology related to measures for preventing damage to a mold opening / closing system mechanism.

  In a molding machine with an automatic tightening operation mode, after the mold is changed, after the operator (operator) inputs and sets the mold clamping force in the display image for setting the mold clamping force, automatic tightening (automatic When the operation of the operation to set the mold clamping force is instructed, the controller that controls the entire machine (molding machine) will execute the operation mode of automatic tightening that automatically sets the mold clamping force. ing. For example, in a molding machine that uses a toggle link mechanism as a mold clamping mechanism (mold opening / closing mechanism), the controller drives the mold thickness adjusting motor to move the tailstock forward and backward, and the mold opening / closing motor By controlling the drive, the toggle link mechanism is extended / folded to move the movable die plate back and forth. For example, the toggle link mechanism is fully extended when the mold is touched but the mold clamping force is not generated. Let me take it. Next, from this state, the movable die plate is moved backward by driving the mold opening / closing motor, and the tail stock is adjusted by a predetermined amount by driving the mold thickness adjusting motor while the movable die plate is moved backward. Adjust the position of the tailstock so that a predetermined clamping force can be obtained when it is moved forward and the toggle link mechanism is fully extended, and the position of the tailstock at this time is the fixed position during molding operation. As a result, the mold clamping force was set.

  FIG. 4 is a diagram showing a general configuration of a mold opening / closing system mechanism of an injection molding machine using a toggle link mechanism. In FIG. 4, 51 is a fixed die plate fixedly installed, 52 is a fixed die mounted on the fixed die plate 51, 53 is held at a fixed position during molding operation, and is operated during automatic tightening operation or manual operation. The tail stock 54 that is driven forward and backward with respect to the fixed die plate 51 when adjusting the mold thickness by the four tie bars that are fixed to the fixed die plate 51 and the tail stock 53 at both ends during the molding operation. , 55 is held on the tail stock 53 so as to be rotatable and immovable in the axial direction, and is provided with a gear thickness adjusting nut 56 which is screwed into a threaded portion of the tie bar 54 protruding toward the tail stock 53. A mold thickness adjusting motor mounted on the tailstock 53 and transmitting the rotation in synchronization with the gear portion 55a of each mold thickness adjusting nut 55 via an appropriate rotation transmitting mechanism. 57 is a movable die plate capable of moving back and forth between the fixed die plate 51 and the tail stock 53, and 58 is a movable side metal mounted on the movable die plate 57. A mold 59 is a toggle link mechanism connecting the tail stock 53 and the movable die plate 57, 60 is a mold opening / closing motor (electric servomotor for mold opening / closing) mounted on the tail stock 53, 61 is a mold opening / closing A ball screw mechanism 62 that transmits the rotation of the motor 60 through an appropriate rotation transmission mechanism and converts the rotational motion into a linear motion, 62 is a ball screw mechanism that is rotatably held by the tailstock 53 via a bearing (not shown). Reference numeral 61 denotes a nut body, 63 denotes a screw shaft of a ball screw mechanism 61 screwed into the nut body 62 and linearly moves by rotation of the nut body 62, and 64 denotes a screw shaft 6 Tip is fixed to the, by forward or backward together with the screw shaft 63, a crosshead to transmit the force to the toggle link mechanism 59.

  After the mold is exchanged, in the display image for setting input of mold clamping force, after the operator (operator) inputs and sets the mold clamping force, the machine (injection molding machine) ) The controller that controls the entire system executes the operation mode of automatic tightening. That is, the controller appropriately drives and controls the mold thickness adjusting motor 56 and rotates the mold thickness adjusting nut 55 to move the tail stock 53 forward and backward, and also appropriately controls and drives the mold opening / closing motor 60. The toggle link mechanism 59 is driven to extend / fold through the ball screw mechanism 61 to move the movable die plate 57 forward and backward, and the toggle link mechanism 59 is in a state where the mold is touched but the mold clamping force is not generated. Let it stretch out. In this state, the movable die plate 57 is moved backward by driving the mold opening / closing motor 60, and the tailstock is driven by controlling the mold thickness adjusting motor 56 in the retracted state of the movable die plate 57. The position of the tail stock 53 is adjusted so that a predetermined mold clamping force can be obtained when the 53 is advanced by a predetermined amount and the toggle link mechanism 59 is fully extended. The mold clamping force is set (determined) by holding the position as a fixed position during the molding operation.

  In the course of the above-described automatic tightening operation, the controller is in a state where the die thickness value of the die before the die change stored and the die touching but the die clamping force is not output. The movement stroke of the tail stock 53 from before the mold replacement and the movement stroke of the movable die plate 57 from the mold opening position until the mold is touched but the mold clamping force is not output are obtained, The mold thickness value of the new mold after the mold replacement is recognized and held.

  In a molding machine such as an injection molding machine or a die casting machine, a manual mold thickness adjustment mode is provided in which the mold thickness adjustment motor 56 is driven and controlled by manual operation so that the mold thickness can be adjusted by moving the tailstock 53 forward and backward. . This manual mold thickness adjustment mode is provided for manually adjusting the thickness of the mold when replacing the mold.

  However, since the mold thickness can be adjusted in the manual mold thickness adjustment mode even after the automatic retightening is completed, for example, burrs have occurred in the molded product in the test shot. In order to prevent this, the current situation is that the mold clamping force is adjusted by the manual mold thickness adjustment mode from the state after completion of automatic tightening, and the mold clamping force is forcibly increased. . For this reason, the mold opening / closing system mechanism of the machine (molding machine) may be used with a clamping force exceeding an allowable value (machine strength specification), and the tie bar 54 is damaged by a long molding operation. It was pointed out that it was a cause of serious accidents such as Nadot.

  The present invention has been made in view of the above points, and an object of the present invention is to have an automatic tightening operation mode for automatically setting the mold clamping force so that the input mold clamping force is obtained. In the molding machine, when the mold thickness adjustment is performed after the automatic tightening is completed, the mold opening / closing system mechanism is prevented from being damaged by preventing the automatic molding operation. .

  In order to achieve the above-described object, the present invention provides a molding machine having an automatic tightening operation mode for automatically setting a mold clamping force so as to obtain an input set mold clamping force. When the mold thickness is adjusted after the mold clamping force has been set, the automatic molding operation is prohibited and an alarm display prompting the execution of automatic tightening again is performed.

  In the present invention, when the mold thickness adjustment is performed after the mold clamping force is once set (determined) by the automatic tightening, the mold clamping force once set by the mold thickness adjustment is changed. By prohibiting automatic molding operations (full automatic molding operation and semi-automatic molding operation), it is possible to reliably prevent damage to the mold opening / closing system mechanism such as tie bar breakage, and to encourage automatic tightening again. By displaying the alarm, the operator can be surely recognized that the automatic molding operation cannot be executed unless automatic tightening is performed again.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 relate to an injection molding machine according to an embodiment of the present invention (hereinafter referred to as the present embodiment), and the present embodiment is a machine using a toggle link mechanism as a mold clamping mechanism (mold opening / closing mechanism). This is an application example to an (injection molding machine), and the mold opening / closing system mechanism of the machine of this embodiment has the same configuration as that shown in FIG.

FIG. 1 is a block diagram showing a main configuration of a control system in the machine of this embodiment.
In FIG. 1, 1 is a system controller that controls the entire machine (injection molding machine). This system controller 1 includes various application programs created in advance and deployed in a work area, various operating condition setting data, , Based on measurement information from various sensors (position sensor, pressure sensor, safety confirmation sensor, etc.) arranged in each part of the machine, status confirmation information from various control systems of the machine, timing information, etc. Control various machine control systems. In addition, the system controller 1 is used for display based on an image processing application program created in advance and expanded in the work area, various image display fixed data, various operating condition setting data, various actual driving data, and the like. The processing for generating the image data is performed. Note that the system controller 1 actually performs various types of arithmetic processing, data writing / calling, in cooperation with hardware resources such as arithmetic functional elements and memories and software resources such as various application software stored in advance. Various processes such as an output process, a command output process, a display control process, and the like are executed, and the functional blocks shown in the system controller 1 are realized by the hardware resources and the software resources. . Here, in the system controller 1, only functional blocks related to the present invention are depicted.

  2 is a key input device disposed on the front surface of the machine, 3 is a display device (color liquid crystal display device with a touch panel) with a touch panel input unit 3a disposed on the front surface of the machine. 2 and the touch panel input unit 3a constitute a user input interface.

  A motor driver 4 drives and controls the mold thickness adjusting motor 56 in response to a command from the system controller 1, and the tail stock 53 is driven forward and backward as described above by driving and controlling the mold thickness adjusting motor 56. . Reference numeral 5 denotes a motor driver that drives and controls the mold opening / closing motor 60 in response to a command from the system controller 1. By driving the mold opening / closing motor 60, the movable die plate 57 is driven forward and backward as described above.

  In the system controller 1, 11 is an overall control unit, 12 is a manual mold thickness adjustment command receiving unit, 13 is an automatic tightening control condition storage unit, 14 is a mold opening / closing control condition storage unit, and 15 is a mold thickness adjustment control unit. , 16 is a mold opening / closing control unit, and 17 is a display processing unit.

  The overall control unit 11 monitors and grasps the state of each part of the machine and controls each part in the system controller 1. In the present embodiment, the overall control unit 11 monitors whether or not the mold thickness adjustment has been performed after the mold clamping force has been once set (determined) by automatic tightening, and after the mold clamping force has been set (determined). When the mold thickness is adjusted, the retightening completion state is changed to the retightening incomplete state, the automatic molding operation is prohibited, and an alarm display image is generated and output to the display processing unit 17. Instruct.

  The manual mold thickness adjustment command receiving unit 12 receives a mold thickness adjustment command manually operated by an operator using the user input interface 2 or 3a, and gives a command to the mold thickness adjustment control unit 15 based on this.

  The automatic tightening control condition storage unit 13 uses the user input interface 2 or 3a to input and set the latest clamping force value by the operator, and the mold thickness value before execution of automatic tightening (after mold replacement). (This is the die thickness value before changing the mold) before the automatic tightening is performed, and the forward / backward procedure of the tailstock 53 for automatic tightening, its forward / backward movement amount, movable The forward / backward procedure of the die plate 57, the forward / backward movement amount thereof, the forward / backward speed / pressure, etc. are calculated and held as necessary.

  The mold opening / closing control condition storage unit 14 holds the mold closing speed / pressure along the stroke, the mold clamping stroke and the mold clamping pressure, and the mold opening speed / pressure along the stroke.

  The mold thickness adjustment control unit 15 performs sensor information and timing information according to the control condition data stored in the automatic tightening control condition storage unit 13 when executing the automatic tightening operation under the control of the overall control unit 11. A command is given to the motor driver 4 while referring to the above. In addition, the mold thickness adjustment control unit 15 performs a mold thickness adjustment operation in the manual mold thickness adjustment mode under the control of the overall control unit 11 according to a command from the manual mold thickness adjustment command receiving unit 12. A command is given to the motor driver 4.

  The mold opening / closing control unit 16, under the control of the overall control unit 11, performs the automatic tightening operation according to the control condition data stored in the automatic tightening control condition storage unit 13, such as sensor information and timing information. A command is given to the motor driver 5 while referring to FIG. In addition, the mold opening / closing control unit 16 performs sensor information and timing information according to the control condition data stored in the mold opening / closing control condition storage unit 14 when the automatic molding operation is performed under the control of the overall control unit 11. A command is given to the motor driver 5 while referring to the above.

  The display processing unit 17 is based on an image processing application program prepared in advance, various image display fixed data, various operation condition setting data, various operation actual measurement data, and the like under the control of the overall control unit 11. Then, images of various display modes are generated and displayed on the display device 3.

  In the present embodiment, the input setting of the mold clamping force for executing the automatic tightening is performed using an image in a predetermined display mode. FIG. 2 shows a display example of the main part of the automatic mode image called on the display device 3 by an appropriate operation of the operator using the user input interface 2 or 3a. A plurality of automatic mode images are prepared. For example, after the first image of the automatic mode image is called, the user input interface 2 or 3a is used to instruct the display of the next image in order, as shown in FIG. An automatic mode image as shown is displayed. The automatic mode image of FIG. 2 is a display image for setting input of mold clamping force, and the operator uses the user input interface 2 or 3a in the numeric input field 21 of mold clamping force in FIG. By inputting numerical values, the mold clamping force can be input and set. In the example shown in FIG. 2, 490 kN is input and set as the mold clamping force. When the numerically input mold clamping force value is a numerical value exceeding the machine capacity, although not shown, the overall control unit 11 indicates that “the input mold clamping force value exceeds the machine capacity. The display processing unit 17 displays an alarm message stating that “Please re-enter”.

  After inputting the mold clamping force value within the range allowed by the machine capability into the mold clamping force numerical value input field 21, touching the “automatic tightening” button 22 on the automatic mode image of FIG. Under the control of the mold thickness adjustment control unit 15 and the mold opening / closing control unit 16 that have received the command from the unit 11, the automatic tightening operation described above in the background art is executed. When the automatic tightening operation is completed and the mold clamping force is set (determined), the mold thickness value measured in the process of the automatic tightening operation is displayed in the mold thickness measurement value display field 23, In addition, a character 24 “replenishment completion” is displayed.

  After the above-described automatic tightening is completed, when the operator performs the mold thickness adjustment operation and changes the mold thickness value in the manual mold thickness adjustment mode, the overall control unit 11 receives the manual mold thickness adjustment command reception unit 12 from The notification recognizes that the mold thickness adjustment has been performed after the mold clamping force has been set by automatic tightening, and sets a flag to shift the automatic tightening completion state to the incomplete state, and automatically While prohibiting the execution of the molding operation (full automatic molding operation and semi-automatic molding operation), for example, as shown in FIG. 3, an alarm message 26 “The mold thickness has changed. Please perform automatic retightening.” The display processing unit 17 performs the processing. In addition, when the automatic tightening is in an incomplete state, the overall control unit 11 performs the process until the mold touch where the mold clamping force is not generated when the operator performs the mold opening / closing operation in the manual mold opening / closing control mode. Transition to the state is allowed, but for further forward operation of the movable die plate 57, a command is issued to drive the mold opening / closing motor 60 at an extremely low speed and low pressure, so that the mold clamping force is substantially reduced. The operation is controlled so as not to be.

  In the present embodiment, the alarm message (alarm display) 26 prompting the execution of the automatic tightening again is displayed in the interrupt window forcibly regardless of the display state of the image in any display mode. Simultaneously with the display, an alarm sound is generated and an alarm indicator lamp is lit. However, display of the alarm message 26, generation of an alarm sound, and lighting of the alarm indicator lamp are performed only for a predetermined period only when the mold thickness is adjusted first after the mold clamping force is set by automatic tightening. In the second and subsequent mold thickness adjustments after the mold clamping force is set by automatic tightening, the alarm message 26 is displayed, the alarm sound is generated, and the alarm indicator lamp is turned on so as not to bother the operator. Is not done.

  When the mold thickness adjustment is performed after the automatic retightening is completed, the automatic mode image (display image for setting the mold clamping force) shown in FIG. 2 is as shown in FIG. A character 25 of “incomplete tightening” indicating the incomplete tightening state is displayed, and the numerical value changed by the mold thickness adjustment after the completion of the automatic tightening is displayed in the mold thickness measurement value display column 23. It is displayed.

  When the automatic tightening is performed again after completion of the automatic tightening incomplete state, the overall control unit 11 sets a flag for transitioning the incomplete state of automatic tightening to the complete state inside. The automatic molding operation (full automatic molding operation and semi-automatic molding operation) is allowed to be executed, and the display image for setting the mold clamping force is displayed with the word “reinforcement complete” as shown in FIG. 24 is displayed.

  When a new molding operation condition is set in the system controller 1 by reading a molding operation condition for performing the next molding operation from the recording medium, the overall control unit 11 has not yet completed tightening. A state flag is set to control the state of incomplete tightening as described above.

  As described above, in the present embodiment, when the mold thickness adjustment is performed after the mold clamping force is once set (determined) by automatic retightening, the mold clamping force once set by the mold thickness adjustment is Because it has been changed, by prohibiting automatic molding operation (fully automatic molding operation and semi-automatic molding operation), it is possible to reliably prevent damage to the mold opening / closing system mechanism such as tie bar damage, By displaying an alarm prompting the execution of the retightening, it is possible to surely recognize that the operator cannot execute the automatic molding operation unless the automatic retightening is performed once again.

It is a block diagram which shows the principal part structure of the control system of the injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the example of a display image in the injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the example of a display image in the injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the general structure of the type | mold opening-closing system mechanism of the injection molding machine using a toggle link mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 System controller 2 Key input device 3 Display apparatus 3a Touch panel input part 4 Motor driver 5 Motor driver 11 Overall control part 12 Manual type | mold thickness adjustment command reception part 13 Automatic tightening control condition storage part 14 Mold opening / closing control condition storage part 15 Mold thickness Adjustment control unit 16 Mold opening / closing control unit 17 Display processing unit 21 Numerical input field of mold clamping force 22 “Automatic tightening” button 23 Display field of mold thickness measurement value 24 “Tightening completed” 25 “Tightening not completed” 26 Alarm message 51 Fixed die plate 52 Fixed mold 53 Tailstock 54 Tie bar 55 Mold thickness adjusting nut 55a Gear section 56 Mold thickness adjusting motor 57 Movable die plate 58 Movable mold 59 Toggle link mechanism 60 Open / close Motor 61 Ball screw mechanism 62 Nut body 63 Screw shaft 64 Crosshead

Claims (6)

In a molding machine with an operation mode of automatic tightening to automatically set the clamping force so that the input clamping force is set,
A controller for prohibiting automatic molding operation and displaying an alarm prompting execution of automatic tightening again when the mold thickness is adjusted after the mold clamping force is set by the automatic tightening. A molding machine characterized by The molding machine according to claim 1,
The controller causes the alarm display to prompt the execution of the automatic tightening again only when the mold thickness is adjusted for the first time after the mold clamping force is set by the automatic tightening. Machine. The molding machine according to claim 1,
When the mold thickness adjustment is performed after the mold clamping force is set by the automatic tightening, the controller changes the state of the completion of the tightening to the state of the untightened state. The molding machine according to claim 3,
When the mold thickness adjustment is performed after the mold clamping force is set by the automatic tightening, the controller causes the display image for setting the mold clamping force to display that the tightening is not completed, A molding machine characterized in that when automatic re-tightening is executed and completed again, a display to the effect that re-tightening is completed is displayed on the display image for setting the mold clamping force. The molding machine according to claim 3,
The molding machine according to claim 1, wherein when a new molding operation condition is set, the controller is in an incomplete tightening state. The molding machine according to claim 3,
When a manual mold closing operation is performed in a state in which retightening is not completed, the controller controls the operation so that a mold clamping force is not substantially generated.

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