JP5770059B2 - Injection molding machine equipped with a tape transport device - Google Patents

Description

  The present invention relates to an injection molding machine that transports a continuous tape into a mold for each cycle, such as hoop molding, and injects a resin onto the transported tape to form a continuous molded product.

There is a hoop molding as a molding method for molding an electronic component by injecting a resin onto a metal component (Patent Document 1, Patent Document 2). In hoop molding, a metal tape wound around a reel is conveyed between molds by a predetermined amount every molding cycle using a drive device such as an air cylinder or a motor. A resin is then injected onto the conveyed tape to complete a molded product. Thus, in the hoop molding, a continuous molded product can be made by repeating the conveyance and injection of the tape.
A sensor for monitoring the slack of the metal tape is attached to the hoop feeding device, and it can be detected whether there is any abnormality in the transport of the tape (Patent Document 3).

JP-A-5-31732 JP-A-8-39604 JP-A-8-39604

In hoop molding, a metal tape is wound around a reel, and it is necessary to replace the reel every time the tape runs out. For smooth production, it is desirable to prepare a reel to be replaced in advance by grasping the reel replacement timing, and immediately replace the reel and resume production as soon as the tape runs out. Also, in order to reduce the burden on the workers at the molding site, when the tape runs out during operation, production is stopped at that point, and the machine (injection molding machine) is safely operated by lowering the cylinder temperature of the molding machine. It is desirable to stop it.
As described above, accurately grasping the remaining amount of tape on the reel is important for smooth production and reducing the burden on the operator. Conventionally, it was possible to visually confirm the amount of tape wound around the reel, but it was not possible to accurately grasp the time when the tape disappeared from that amount. Further, since the above-described conventional sag monitoring sensor only knows that an abnormality has occurred in the conveyance of the tape, it cannot be used as a means for confirming in advance the reel replacement time.

  Therefore, an object of the present invention is provided with a transport device that can accurately grasp the remaining amount of the tape on the reel and injects resin onto the continuous tape fed from the reel to form a continuous molded product. It is to provide an injection molding machine.

In the invention according to claim 1 of the present application, in an injection molding machine including a tape wound around a reel and a tape conveying device that conveys the tape between molds for each molding cycle, the reel was first wound around the reel. An input unit that inputs the initial length of the tape, an integration unit that integrates the transport amount of the tape transported by the transport unit to obtain an integrated value, and a reset unit that resets the integrated value when the reel is replaced And a remaining amount calculating unit for calculating the remaining amount of the tape from the difference between the initial length and the integrated value, and a value obtained by dividing the remaining amount of the tape by the tape conveyance amount for one molding cycle until the tape disappears. An injection molding machine provided with a tape conveying device, comprising: a remaining molding cycle number calculating unit that calculates the number of remaining molding cycles; and a display unit that displays the remaining molding cycle number.
The invention according to claim 2 includes a remaining time calculation unit that obtains a remaining time until the tape disappears by multiplying the cycle time by the number of remaining molding cycles,
The injection molding machine provided with the tape transport device according to claim 1 , wherein at least the remaining time is displayed on the display unit.
Invention, a tape according to any one of claims 1 or 2, characterized in that the remaining amount of the tape generates a warning if it becomes less than a preset remaining amount according to claim 3 An injection molding machine provided with a transport device.
The invention according to claim 4, according to any one of claims 1 or 2, characterized in that to stop the molding operation when the remaining amount of the tape is less than a preset remaining amount An injection molding machine provided with a tape transport device.

  According to the present invention, there is provided an injection molding machine equipped with a transport device that can accurately grasp the remaining amount of tape on a reel and injects resin onto a continuous tape fed from a reel to form a continuous molded product. Can be provided.

It is a figure explaining embodiment of this invention. It is a figure explaining the example of a display displayed on the display apparatus of the injection molding machine in embodiment of this invention. It is a flowchart which shows the algorithm of the process which concerns on embodiment of this invention. It is a flowchart which shows the algorithm of the process which concerns on embodiment of this invention. It is a flowchart which shows the algorithm of the process which concerns on embodiment of this invention. It is a flowchart which shows the algorithm of the process which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present invention provides an injection molding machine equipped with a reel on which a tape is wound and a tape transport device for transporting the tape. The amount of tape used on the reel, the remaining amount of tape, and the number of shots and time until the tape runs out are displayed on the screen. It is an invention relating to an injection molding machine equipped with a tape conveying device, characterized by outputting a warning when the remaining amount of tape is low or automatically switching the operation mode of the machine to a stop mode. is there.

FIG. 1 is an example of an embodiment of the present invention. The injection molding machine M includes a mold clamping part Mc and an injection part Mi on a machine base (not shown). The injection part Mi heats and melts a resin material (pellet), and injects the molten resin into a cavity of a mold (movable side mold 35, fixed side mold 36). The mold clamping part Mc mainly opens and closes the mold (movable side mold 35, fixed side mold 36).
The injection part Mi will be described. A nozzle 2 is attached to the tip of the injection cylinder 1, and a screw 3 is inserted into the injection cylinder 1. In the injection device 5, a drive mechanism for moving the screw 3 forward and backward in the injection cylinder 1 and rotating around the axis is provided. Reference numeral 4 denotes a hopper that supplies resin to the injection cylinder 1.

Next, the mold clamping part Mc will be described. The mold clamping section Mc includes a mold opening / closing motor M1, a rear platen 31, a movable platen 30, a tie bar 32, a fixed platen 33, a toggle link mechanism 34, a movable side mold 35, and a fixed side mold 36. The rear platen 31 and the fixed platen 33 are connected by a plurality of tie bars 32, and the movable platen 30 is arranged to be guided by the tie bars 32. A movable mold 35 is attached to the movable platen 30, and a fixed mold 36 is attached to the fixed platen 33.
The toggle link mechanism 34 can operate the toggle link mechanism 34 by moving the cross head 39 attached to the ball screw shaft 38 driven by the mold opening / closing motor M1 forward and backward. In this case, when the cross head 39 is moved forward (moved in the right direction in the figure), the movable platen 30 is moved forward to perform mold closing and mold clamping.

  The mold opening / closing motor M1 is preferably a servomotor and includes a position / speed detector P1 for detecting the rotational position. The detection signal of the rotational position of the mold opening / closing motor M1 detected by the position / speed detector P1 is input to the servo CPU 15 via the servo amplifier 11.

  The transport device for the metal tape 42 is provided with a tape transport motor M2 which is a transport servomotor controlled by the control device 10 of the injection molding machine M. The metal tape 42 wound around the metal tape supply reel 40 passes between the movable side mold 35 and the fixed side mold 36 and is wound around the molded product collection reel 41. A position / speed detector P2 is attached to the tape transport motor M2, and a rotation position detection signal of the tape transport motor M2 is input to the servo CPU 15 via the servo amplifier 12.

The control device 10 of the injection molding machine M includes a CNC CPU 20 that is a microprocessor for numerical control, a PMC CPU 17 that is a microprocessor for a programmable machine controller, and a servo CPU 15 that is a microprocessor for servo control. Thus, by selecting mutual input / output, information can be transmitted between the microprocessors.
The servo CPU 15 is connected to a ROM 13 that stores a control program dedicated to servo control that performs processing of a position loop, a speed loop, and a current loop, and a RAM 14 that is used for temporary storage of data. The servo CPU 15 is connected to servo amplifiers 11 and 12 for driving the mold opening / closing motor M1 and the tape transport motor M2 based on a command from the servo CPU 15, and position / speed detection attached to the servo motors M1 and M2. The outputs from the devices P1 and P2 are fed back to the servo CPU 15. The rotational positions of the servo motors M1 and M2 are calculated by the servo CPU 15 based on the position feedback signals from the position / speed detectors P1 and P2, and updated and stored in the current position storage registers.

A ROM 18 storing a sequence program for controlling the sequence operation of the injection molding machine and a RAM 19 used for temporary storage of calculation data are connected to the PMC CPU 17, and an automatic operation program for overall control of the injection molding machine is connected to the CNC CPU 20. A ROM 21 storing various programs such as a control program for controlling a transport device that transports the metal tape 42 related to the present invention and a RAM 22 used for temporary storage of calculation data are connected.
The molding data storage RAM 23 is a non-volatile memory, and is a molding data storage memory that stores molding conditions relating to injection molding work, various set values, parameters, macro variables, and the like. A display device / MDI (manual data input device) 25 is connected to the bus 16 via a display circuit 24, and selects a function menu and various data (tape initial length, tape transport amount per molding cycle, one molding cycle). Per hour (cycle time)). A numeric keypad for inputting numeric data and various function keys are provided. The display device may be an LCD (liquid crystal display device), CRT, or other display device.

  With the above-described configuration of the injection molding machine, the PMC CPU 17 controls the sequence of the entire injection molding machine, and the CNC CPU 20 controls the mold opening / closing motor M1, based on the molding conditions stored in the operation program of the ROM 21 and the molding data storage RAM 23. The movement command is distributed to each servo motor including the tape transport motor M2, and the servo CPU 15 detects the movement command distributed to each servo motor and the position detector including the position / speed detectors P1 and P2. Based on the feedback signal and the like, digital servo processing is executed to drive and control each servo motor.

  A molding operation using the injection molding machine M will be described. When the mold opening / closing motor M1 is rotated in the forward direction, the driving force of the motor rotates the pulley 37 attached to the end of the ball screw shaft 38 via the power transmission mechanism, and the ball screw shaft 38 rotates in the forward direction. The cross head 39 screwed into the ball screw shaft 38 is advanced (rightward in FIG. 1), and when the toggle link mechanism 34 is operated, the movable platen 30 is advanced.

When the movable mold 35 attached to the movable platen 30 comes into contact with the fixed mold 36 (mold closed state), the mold clamping process is started. In the mold clamping process, the mold opening / closing motor M1 is further driven in the forward direction, whereby a mold clamping force is generated in the mold (movable side mold 35, fixed side mold 36) by the toggle link mechanism 34. Then, a screw forward / backward servomotor (not shown) provided in the injection part Mi is driven to advance in the axial direction of the screw 3, and the injection cylinder is inserted into the cavity space formed in the mold (35, 36). The molten resin is injected from 1, and the cavity space is filled with the molten resin.
When performing mold opening, when the mold opening / closing motor M1 is driven in the reverse direction, the ball screw shaft 38 is rotated in the reverse direction. Along with this, the cross head 39 moves backward, the toggle link mechanism 34 operates in a bending direction, and the movable platen 30 moves backward in the direction of the rear platen 31. When the mold opening process is completed, an ejector forward / reverse motor (not shown) for pushing out an ejector pin (not shown) that pushes out the molded product from the movable mold 35 is operated. As a result, the ejector pin protrudes from the inner surface of the movable mold 35 and the molded product in the movable mold 35 protrudes from the movable mold 35. After the resin molding, the molded product is intermittently conveyed by driving the tape conveying motor M2. As a result, in the next molding cycle, the portion before molding of the metal tape 42 is located between the movable side mold 35 and the fixed side mold 36.

  When the metal tape 42 is conveyed during the continuous molding or by manual operation, the control device 10 of the injection molding machine M determines the conveyance amount of the metal tape 42 from the position / speed detector P2 provided in the tape conveyance motor M2. It is acquired by the information, and the detected conveyance amount is integrated and displayed on the screen of the display device provided in the injection molding machine M. Then, the operator who operates the injection molding machine M grasps the remaining amount of the tape by comparing the integrated value of the transport amount displayed on the screen with the initial length of the tape wound on the reel first. Can do.

Furthermore, the initial length of the metal tape 42 initially wound on the metal tape supply reel 40 can be set in advance, and the remaining amount of the tape can be calculated from the difference from the initial length with the integrated amount. Then, the remaining amount of the metal tape 42 may be divided by the conveyance amount for one molding cycle to display the number of remaining molding cycles until the metal tape 42 disappears. Alternatively, the remaining time until the tape runs out may be displayed by multiplying the number of remaining molding cycles by the cycle time of one molding cycle. The cycle time may be the current molding cycle time or may be a preset time. Note that the time at which the tape runs out may be displayed by adding the remaining time to the current time instead of the remaining time.
When the reel is exchanged, the operator can reset the accumulated amount and resume the accumulated amount of conveyance with a new reel.

FIG. 2 is a diagram illustrating a display example displayed on the display device of the injection molding machine according to the embodiment of the present invention. On the display screen of the display device, the integrated transport amount (actual value), tape initial length setting value, remaining amount, transport amount (1 molding cycle), remaining cycle number, cycle time (actual value), remaining time, tape end A warning is displayed. When the metal tape supply reel 40 is replaced, a reset button for resetting the integrated transport amount and the remaining amount is also displayed. These display contents may be selected and displayed as appropriate.
In FIG. 2, the integrated transport amount (actual value) is 4500 (mm), the initial tape length is 5000 (mm), the remaining amount is 500 (mm), the transport amount (1 cycle) is 25 (mm), and the number of remaining cycles. Is 20 shots, the cycle time (actual value) is 10 seconds, the remaining time is 200 (seconds), and the tape end warning is displayed before 300 (mm). Since the remaining amount is 500 (mm) and the remaining amount before the tape end warning, the tape end warning is not issued in this display state.

Hereinafter, a process for obtaining display contents to be displayed on the display device will be described using a flowchart.
FIG. 3 is a flowchart showing a processing algorithm according to the embodiment of the present invention. This flowchart is a process for displaying the remaining tape amount. Hereinafter, it demonstrates according to each step.
[Step SA01] It is determined whether or not the reel is to be replaced. If the reel is replaced (YES), the process proceeds to Step SA02. If the reel is not replaced (NO), the process proceeds to Step SA03.
[Step SA02] The integrated value (Fa) of the tape transport amount is initialized to 0, and the process returns to Step SA01 and continues.
[Step SA03] It is determined whether or not the tape transport servomotor is being driven. If it is being driven (YES), the process proceeds to Step SA04, and if it is not being driven (NO), it is being driven. The process proceeds to step SA04.
[Step SA04] The tape transport amount F is read.
[Step SA05] The tape transport amount integrated value (Fa) is updated to a value obtained by adding the tape transport amount integrated value (Fa) to the transport amount (F) read in step SA04.
[Step SA06] The remaining tape amount (Fr) is calculated by subtracting the integrated value (Fa) of the tape transport amount from the initial tape amount (Fi).
[Step SA07] The remaining tape amount (Fr) is displayed, and the process returns to step SA01 to continue the processing.

FIG. 4 is a flowchart showing a processing algorithm according to the embodiment of the present invention. This flowchart is a process for displaying the number of remaining cycles. Hereinafter, it demonstrates according to each step.
[Step SB01] It is determined whether or not the reel is to be replaced. If the reel is replaced (YES), the process proceeds to Step SB02. If the reel is not replaced (NO), the process proceeds to Step SB03.
[Step SB02] The integrated value (Fa) of the tape transport amount is initialized to 0, and the process returns to step SB01 and continues.
[Step SB03] It is determined whether or not the tape transport servomotor is being driven. If it is being driven (YES), the process proceeds to Step SB04, and if it is not being driven (NO), it is being driven. The process proceeds to step SB04.
[Step SB04] The tape transport amount F is read.
[Step SB05] The tape transport amount integrated value (Fa) is updated to a value obtained by adding the tape transport amount integrated value (Fa) to the transport amount (F) read in step SB04.
[Step SB06] The remaining tape amount (Fr) is calculated by subtracting the integrated value (Fa) of the tape transport amount from the initial tape amount (Fi).
[Step SB07] The number of remaining molding cycles is calculated by dividing the remaining tape amount (Fr) by the transport amount per cycle.
[Step SB08] The number of remaining molding cycles is displayed, and the process returns to Step SB01 and continues.

FIG. 5 is a flowchart showing a processing algorithm according to the embodiment of the present invention. This flowchart is a process for performing a warning process when the remaining tape amount is less than the tape end warning amount. Hereinafter, it demonstrates according to each step.
[Step SC01] It is determined whether or not the reel is to be replaced. If the reel is replaced (YES), the process proceeds to Step SC02. If the reel is not replaced (NO), the process proceeds to Step SC03.
[Step SC02] The integrated value (Fa) of the tape transport amount is initialized to 0, and the process returns to step SC01 and continues.
[Step SC03] It is determined whether or not the tape transport servomotor is being driven. If it is being driven (YES), the process proceeds to Step SC04. If it is not being driven (NO), it is being driven. The process proceeds to step SC04.
[Step SC04] The tape transport amount F is read.
[Step SC05] The tape transport amount integrated value (Fa) is updated to a value obtained by adding the tape transport amount integrated value (Fa) to the transport amount (F) read in step SC04.
[Step SC06] The remaining tape amount (Fr) is calculated by subtracting the integrated value (Fa) of the tape transport amount from the initial tape amount (Fi).
[Step SC07] The remaining tape amount (Fr) is displayed.
[Step SC08] It is determined whether or not the remaining tape amount (Fr) is smaller than the tape end warning amount (Fw). If it is smaller (in the case of YES), the process proceeds to Step SC09, and if it is not smaller (in the case of NO). Return to step SC01 and continue the process.
[Step SC09] A warning process is executed, and the process returns to step SC01 to continue the process.

  As warning processing in step SC09, there are, for example, processing for displaying a warning on the display screen of the display device, processing for turning on a warning lamp provided in the injection molding machine, and processing for sounding a buzzer. Such warning processing can alert the operator that the remaining tape amount (Fr) is less than the tape end warning amount (Fw). As a result, the operator can prepare for the next reel before the reel runs out, so that the reel can be smoothly exchanged.

FIG. 6 is a flowchart showing a processing algorithm according to the embodiment of the present invention. This flowchart is a process of performing a process of stopping the molding operation when the remaining tape amount is smaller than the tape end warning amount. Hereinafter, it demonstrates according to each step.
[Step SD01] It is determined whether or not the reel is to be replaced. If the reel is replaced (YES), the process proceeds to Step SD02. If the reel is not replaced (NO), the process proceeds to Step SD03.
[Step SD02] The integrated value (Fa) of the tape transport amount is initialized to 0, and the process returns to step SD01 and continues.
[Step SD03] It is determined whether or not the tape transport servomotor is being driven. If it is being driven (YES), the process proceeds to Step SD04, and if it is not being driven (NO), it is being driven. The process proceeds to step SD04.
[Step SD04] The tape transport amount F is read.
[Step SD05] The tape transport amount integrated value (Fa) is updated to a value obtained by adding the tape transport amount integrated value (Fa) to the transport amount (F) read in step SD04.
[Step SD06] The remaining tape amount (Fr) is calculated by subtracting the integrated value (Fa) of the tape transport amount from the initial tape amount (Fi).
[Step SD07] The remaining tape amount (Fr) is displayed.
[Step SD08] It is determined whether or not the remaining tape amount (Fr) is smaller than the tape end warning amount (Fw). If it is smaller (in the case of YES), the process proceeds to step SD09, and if it is not smaller (in the case of NO). In step SD01, the process is continued.
[Step SD09] The molding operation stop process is executed, and the process ends.

  As a warning process in step SD09, when the remaining tape amount (Fr) becomes less than a predetermined amount such as a tape end warning amount (Fw) during molding in order to reduce the burden on the operator, instead of the above alert In addition, the machine operation may be automatically stopped. In this case, after stopping the operation, the machine is safely stopped by retreating the injection unit composed of the injection cylinder 1 or the like and automatically discharging the resin, or further lowering the temperature of the injection cylinder 1. What should I do?

  As described above, according to the present invention, in an injection molding machine that forms a continuous molded product by injecting resin onto a continuous tape fed from a reel, the remaining amount of tape on the reel and the time for replacing the reel are accurately grasped. can do. As a result, the reels can be exchanged at an appropriate timing, and production can proceed smoothly. Furthermore, when the remaining amount is low, a warning is displayed or the production is automatically stopped (the molding operation is automatically stopped), thereby reducing the burden on the operator.

  In the present invention, the drive means of the transport device is preferably a servo motor as shown in FIG. 1, but the transport device provided with a drive device having no means for detecting the tape transport amount, such as an air cylinder or a general-purpose motor. Even in such a case, position detection means such as an encoder may be added as means for detecting the tape conveyance amount to detect the tape conveyance amount. Further, when the tape transport amount is the same every time, the number of times of transport may be integrated, and the integrated value of the tape transport amount may be obtained by multiplying this number by the tape transport amount for one time.

1 Injection cylinder 2 Nozzle 3 Screw 4 Hopper 5 Injection device

10 Controller 11 Servo amplifier 12 Servo amplifier 13 ROM
14 RAM
15 Servo CPU
16 bus 17 PMCCPU
18 ROM
19 RAM
20 CNCCPU
21 ROM
22 RAM
23 Molding data storage RAM
24 display circuit 25 display device / MDI (manual data input device)

30 Movable platen 31 Rear platen 32 Tie bar 33 Fixed platen 34 Toggle link mechanism 35 Movable side mold 36 Fixed side mold 37 Pulley 38 Ball screw shaft
39 Crosshead 40 Metal tape supply reel 41 Molded product collection reel 42 Metal tape

M injection molding machine Mc mold clamping part Mi injection part M1 mold opening / closing motor M2 tape transport motor

P1, P2 position / speed detector

Claims (4)

In an injection molding machine equipped with a tape wound around a reel and a tape transport device for transporting the tape between molds for each molding cycle,
An input unit for inputting an initial length of the tape initially wound on the reel;
An accumulator for accumulating the amount of tape transported by the transport means to obtain an integrated value;
A reset unit that resets the integrated value when the reel is replaced;
A remaining amount calculating unit for calculating the remaining amount of the tape from the difference between the initial length and the integrated value;
A remaining molding cycle number calculating unit for calculating a value obtained by dividing the remaining amount of the tape by a tape conveyance amount for one molding cycle as the number of remaining molding cycles until the tape is removed;
A display for displaying the number of remaining molding cycles ;
An injection molding machine provided with a tape conveying device. A remaining time calculation unit for obtaining a remaining time until the tape is lost by multiplying the cycle time by the number of remaining molding cycles,
The injection molding machine provided with the tape transport device according to claim 1, wherein at least the remaining time is displayed on the display unit. 3. An injection molding machine equipped with a tape conveying device according to claim 1, wherein a warning is generated when the remaining amount of the tape is less than a preset remaining amount. . 3. The injection molding with a tape conveying device according to claim 1 , wherein the molding operation is stopped when the remaining amount of the tape is less than a preset remaining amount. Machine.

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