JP2021160151A - Injection molding machine - Google Patents

Abstract

To provide a technique capable of improving the convenience of a user of an injection molding machine when the combination of molds fitted to each other is changed by the rotation of a rotary disk.SOLUTION: An injection molding machine comprises a platen on which a first mold and a second mold are separately mounted; a rotary disk on which a third mold and a fourth mold are separately mounted; a rotating mechanism for rotating the rotary disk at a first rotation angle at which the first mold and the third mold are fitted and the second mold and the fourth mold are fitted, and at a second rotation angle at which the first mold and the fourth mold are fitted and the second mold and the third mold are fitted; a moving mechanism for relatively moving the platen and the rotary disk in a mold opening/closing direction; a detection unit for detecting a movement resistance of a closed or open mold; and a determination unit for determining a mounting abnormality of the first mold, the second mold, the third mold, and the fourth mold on the basis of the movement resistance detected by the detection unit.SELECTED DRAWING: Figure 13

Description

The present invention relates to an injection molding machine.

The injection molding machine for two-color molding of Patent Document 1 includes a mold clamping device installed on the machine base and a pair of injection devices installed side by side. The mold clamping device has a fixed plate fixed in the middle of the machine base, a support plate fixed to the end of the machine base, four tie bars erected between the support plate and the fixed plate, and slidable to each tie bar. It is provided with a movable platen loaded in the machine and a mold clamping cylinder for advancing and retreating the movable platen. The rotating discs are arranged so as to overlap the front surface of the movable disc (the surface facing the fixed disc), and two movable molds are attached to the front surface of the rotating disc. On the other hand, two fixed molds are attached to the rear surface of the fixed plate (the surface facing the rotating plate). Every time the turntable rotates 180 °, the combination of the movable type and the fixed type that are fitted to each other changes.

Japanese Unexamined Patent Publication No. 2015-205395

In two-color molding and the like, the combination of molds fitted to each other changes according to the rotation angle of the turntable. Even if the combination of molds to be fitted to each other changes, the work procedure for attaching the molds is determined so that the fitting can be performed smoothly.

If the mold is attached without observing the determined work procedure, there is a problem that the fitting is not performed smoothly and a large movement resistance is generated when the mold is closed or opened. The above problem may also occur when a mold for ordinary molding other than for two-color molding is mistakenly attached.

In normal molding, a turntable is not used and the same combination of molds is always fitted. Since a normal mold for molding is not manufactured on the assumption that it is fitted with a mold of another combination, the above problem may occur when it is used as a mold for two-color molding or the like.

As described above, a large movement resistance may be generated when the mold is closed or when the mold is opened due to an abnormality in the mounting of the mold. If a large movement resistance is generated, the mold or the mold clamping device can be damaged, so that the injection molding machine is abnormally stopped. In this case, the user of the injection molding machine sometimes called a maintenance company without noticing the mounting abnormality of the mold.

One aspect of the present invention provides a technique capable of improving the convenience of a user of an injection molding machine when the combination of molds fitted to each other changes due to the rotation of the turntable.

The injection molding machine according to one aspect of the present invention is
The first platen to which the first mold and the second mold are individually attached,
A turntable to which the 3rd mold and the 4th mold are individually attached,
A second platen to which the turntable is rotatably attached,
The first rotation angle at which the first mold and the third mold are fitted and the second mold and the fourth mold are fitted, and the first mold and the fourth mold are fitted. A rotation mechanism for rotating the turntable at a second rotation angle at which the second mold and the third mold are fitted together with each other.
A moving mechanism that relatively moves the first platen and the second platen in the mold opening / closing direction,
A detector that detects the movement resistance of mold closing or mold opening,
Based on the moving resistance detected by the detection unit, it has a determination unit for determining an attachment abnormality between the first mold, the second mold, the third mold, and the fourth mold.

According to one aspect of the present invention, when the combination of dies to be fitted to each other changes due to the rotation of the turntable, it is possible to determine the mounting abnormality of the dies, so that the convenience of the user of the injection molding machine can be improved.

FIG. 1 is a diagram showing a state at the time of completion of mold opening of the injection molding machine according to the embodiment. FIG. 2 is a diagram showing a state at the time of mold clamping of the injection molding machine according to the embodiment. FIG. 3 is a horizontal cross-sectional view showing a state of the mold apparatus at the time of mold clamping when the rotation angle of the turntable according to the embodiment is the first rotation angle. FIG. 4 is a horizontal cross-sectional view showing a state of the mold apparatus when the rotation angle of the turntable according to the embodiment is the first rotation angle and the mold opening is completed. FIG. 5 is a horizontal cross-sectional view showing a state of the mold apparatus at the time of mold clamping when the rotation angle of the turntable according to the embodiment is the second rotation angle. FIG. 6 is a horizontal cross-sectional view showing a state of the mold apparatus when the rotation angle of the turntable according to the embodiment is the second rotation angle and the mold opening is completed. FIG. 7 is a vertical cross-sectional view showing a state of the mold apparatus at the time of mold clamping when the rotation angle of the rotary disk according to the embodiment is the first rotation angle. FIG. 8 is a horizontal cross-sectional view showing an example of the correct mounting procedure of the mold. FIG. 9 is a horizontal cross-sectional view showing an example of a correct mounting procedure of the mold, following FIG. FIG. 10 is a horizontal cross-sectional view showing an example of an erroneous mounting procedure of the mold. FIG. 11 is a horizontal cross-sectional view showing an example of fitting performed after the erroneous mounting procedure of FIG. FIG. 12 is a diagram showing an example of a component of a control device in a functional block. FIG. 13 is a flowchart showing an example of processing of the control device. FIG. 14 is a flowchart showing another example of the processing of the control device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding configurations may be designated by the same reference numerals and description thereof may be omitted.

FIG. 1 is a diagram showing a state at the time of completion of mold opening of the injection molding machine according to the embodiment. FIG. 2 is a diagram showing a state at the time of mold clamping of the injection molding machine according to the embodiment. FIG. 3 is a horizontal cross-sectional view showing a state of the mold apparatus at the time of mold clamping when the rotation angle of the turntable according to the embodiment is the first rotation angle. FIG. 4 is a horizontal cross-sectional view showing a state of the mold apparatus when the rotation angle of the turntable according to the embodiment is the first rotation angle and the mold opening is completed. FIG. 5 is a horizontal cross-sectional view showing a state of the mold apparatus at the time of mold clamping when the rotation angle of the turntable according to the embodiment is the second rotation angle. FIG. 6 is a horizontal cross-sectional view showing a state of the mold apparatus when the rotation angle of the turntable according to the embodiment is the second rotation angle and the mold opening is completed. FIG. 7 is a vertical cross-sectional view showing a state of the mold apparatus at the time of mold clamping when the rotation angle of the rotary disk according to the embodiment is the first rotation angle. 1 and 2 are vertical cross-sectional views taken along the line I-I of FIG.

In the present specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The X-axis direction and the Y-axis direction represent the horizontal direction, and the Z-axis direction represents the vertical direction. When the mold clamping device 100 is a horizontal type, the X-axis direction is the mold opening / closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The negative side in the Y-axis direction is called the operating side, and the positive side in the Y-axis direction is called the counter-operating side.

As shown in FIGS. 1 to 7, the injection molding machine 10 includes a mold clamping device 100 that opens and closes the mold device 800, and a first ejector device 201 that projects the first unnecessary item 23 molded by the mold device 800. , A second ejector device 202 that projects both the second molded product 22 and the second unnecessary product 24 molded by the mold device 800, a first injection device 301 that injects a molding material into the mold device 800, and a mold. A second injection device 302 for injecting a molding material into the device 800, a first moving device 401 for advancing and retreating the first injection device 301 with respect to the mold device 800, and a second injection device 302 for advancing and retreating the second injection device 302 with respect to the mold device 800. It has a second moving device (not shown), a control device 700 that controls each component of the injection molding machine 10, and a frame 900 that supports each component of the injection molding machine 10. The frame 900 includes a mold clamping device frame 910 and an injection device frame 920. The mold clamping device frame 910 and the injection device frame 920 are installed on the floor 2 via the leveling adjuster 930, respectively. The control device 700 is arranged in the internal space of the injection device frame 920. Hereinafter, each component of the injection molding machine 10 will be described.

(Molding device)
In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (for example, the positive direction of the X-axis) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened (for example, the negative direction of the X-axis) is defined as the rear. do.

The mold clamping device 100 performs mold closing, boosting, mold clamping, depressurization, and mold opening of the mold apparatus 800. The mold device 800 includes a first fixed mold 810A, a second fixed mold 810B, a first movable mold 820A, and a second movable mold 820B. In the present embodiment, the first fixed mold 810A is used as the first mold described in the scope of the patent claim, the second fixed mold 810B is used as the second mold described in the scope of the patent claim, and the first movable mold 820A is used. Corresponds to the third mold described in the scope of the patent claim, and the second movable mold 820B corresponds to the fourth mold described in the scope of the patent claim.

The mold clamping device 100 is, for example, a horizontal type, and the mold opening / closing direction is the horizontal direction. The mold clamping device 100 includes a fixed platen 110 to which the first fixed mold 810A and the second fixed mold 810B are attached, a rotary platen 520 to which the first movable mold 820A and the second movable mold 820B are attached, and the like. It has a movable platen 120 to which the rotating platen 520 is rotatably attached, a rotating mechanism 530 that rotates the rotating platen 520, and a moving mechanism 102 that advances and retreats the movable platen 120 with respect to the fixed platen 110. In the present embodiment, the fixed platen 110 corresponds to the first platen described in the claims, and the movable platen 120 corresponds to the second platen described in the claims.

The fixed platen 110 is fixed to the mold clamping device frame 910. The first fixed mold 810A and the second fixed mold 810B are attached to the surface of the fixed platen 110 facing the movable platen 120. The first fixed mold 810A forms a part of the wall surface of the first cavity space 801 in which the first molded product 21 is molded. On the other hand, the second fixed mold 810B forms a part of the wall surface of the second cavity space 802 in which the second molded product 22 including the first molded product 21 is molded. The first fixed mold 810A and the second fixed mold 810B are formed in different shapes, and each is formed in a concave shape, for example. The first fixed mold 810A has a plurality of plates 871A, 875A, and 876A laminated in the mold opening / closing direction. The second fixed mold 810B also has a plurality of plates 871B, 875B, and 876B laminated in the mold opening / closing direction. The plates 871A and 871B mounted on the fixed platen 110 are referred to as fixed mounting plates 871A and 871B. The plates 876A and 876B forming the cavity space are referred to as fixed mold plates 876A and 876B. The plates 875A and 875B arranged between the fixed mounting plates 871A and 871B and the fixed mold plates 876A and 876B are referred to as intermediate plates 875A and 875B.

The movable platen 120 is movably arranged in the mold opening / closing direction with respect to the mold clamping device frame 910. A guide 101 for guiding the movable platen 120 is laid on the mold clamping device frame 910. A turntable 520 is attached to the surface of the movable platen 120 facing the fixed platen 110. As shown in FIGS. 3 to 7, the movable platen 120 rotatably supports the rotating shaft 571 of the turntable 520 via the bearing 572.

The turntable 520 is rotatably attached to the movable platen 120. The rotation center line 520X of the turntable 520 is parallel to the mold opening / closing direction. As shown in FIG. 7, the rotary disk 520 includes, for example, a mold mounting portion 521, a disc portion 523 that supports the mold mounting portion 521 from the rear, and a cylindrical portion 524 that extends rearward from the outer peripheral portion of the disc portion 523. including. The first movable mold 820A and the second movable mold 820B are mounted on the surface of the mold mounting portion 521 facing the fixed platen 110. As shown in FIGS. 3 and 5, the first movable mold 820A and the second movable mold 820B are a part of the wall surface of the first cavity space 801 and a part of the wall surface of the second cavity space 802, respectively. And are formed in order. The first movable mold 820A and the second movable mold 820B are formed in the same shape, and each is formed in a convex shape, for example. The first movable mold 820A has a plurality of plates 831A, 835A, 836A laminated in the mold opening / closing direction. The second movable mold 820B also has a plurality of plates 831B, 835B, 836B laminated in the mold opening / closing direction. The plates 831A and 831B attached to the movable platen 120 are referred to as movable mounting plates 831A and 831B. The plates 836A and 836B forming the cavity space are referred to as movable mold plates 836A and 836B. The plates 835A and 835B arranged between the movable mounting plates 831A and 831B and the movable mold plates 836A and 836B are referred to as spacer blocks 835A and 835B.

In the present embodiment, the first fixed mold 810A and the second fixed mold 810B are formed in a concave shape, and the first movable mold 820A and the second movable mold 820B are formed in a convex shape. The present invention is not limited to this. That is, the first fixed mold 810A and the second fixed mold 810B may be formed in a convex shape, and the first movable mold 820A and the second movable mold 820B may be formed in a concave shape.

The rotation mechanism 530 (see FIG. 7) rotates the turntable 520. The rotation mechanism 530 includes a rotation motor 531 and a transmission mechanism 532 that transmits the rotation driving force of the rotation motor 531 to the rotary disk 520. The transmission mechanism 532 is composed of, for example, a drive gear 533, an intermediate gear 534, a passive gear 535, and the like. The intermediate gear 534 may not be provided, and the drive gear 533 and the passive gear 535 may be connected to each other.

The rotation mechanism 530 rotates the turntable 520 to the first rotation angle and the second rotation angle. In the first rotation angle, for example, as shown in FIG. 3, the first fixed mold 810A and the first movable mold 820A are fitted, and the second fixed mold 810B and the second movable mold 820B are fitted. The angle of rotation. The first rotation angle is, for example, 0 °. On the other hand, in the second rotation angle, as shown in FIG. 5, the first fixed mold 810A and the second movable mold 820B are fitted, and the second fixed mold 810B and the first movable mold 820A are fitted together. The angle of rotation to be fitted. The second rotation angle is, for example, 180 °.

Every time the turntable 520 is rotated 180 °, the rotation direction of the turntable 520 may be reversed. For example, the rotation mechanism 530 rotates the turntable 520 clockwise by 180 ° and then rotates the turntable 520 counterclockwise by 180 °. Since the arrangement of the wiring and the piping fixed to the turntable 520 is restored, the wiring and the piping can be easily routed.

As shown in FIG. 3, at the time of mold clamping, the first movable mold 820A and the first fixed mold 810A form the first cavity space 801 and the second movable mold 820B and the second fixed mold 810B are formed. A second cavity space 802 is formed. A molding material is supplied from the first injection device 301 to the first cavity space 801 to mold the first molded product 21. Subsequently, mold opening is performed.

Next, as shown in FIG. 4, the first ejector device 201 projects the first unnecessary item 23 from the first movable mold 820A. The first unnecessary product 23 is solidified inside the mold apparatus 800 together with the first molded product 21. The rotation mechanism 530 then rotates the turntable 520 by 180 °. Along with the rotation of the turntable 520, the first movable mold 820A is rotated by 180 °. At this time, the first molded product 21 is rotated by 180 ° together with the first movable mold 820A without protruding from the first movable mold 820A. After that, mold clamping is performed as shown in FIG.

As shown in FIG. 5, at the time of mold clamping, the second movable mold 820B and the first fixed mold 810A form the first cavity space 801 and the first movable mold 820A and the second fixed mold 810B form a first cavity space 801. A second cavity space 802 is formed. As described above, the first molded product 21 is arranged in a part of the second cavity space 802. A molding material is supplied from the second injection device 302 to the rest of the second cavity space 802, and the second molded product 22 is molded. The second molded product 22 will be described as including the first molded product 21. The first molded product 21 is molded in parallel with the molding of the second molded product 22. The first molded product 21 is molded in the first cavity space 801. Subsequently, mold opening is performed.

Next, as shown in FIG. 6, the second ejector device 202 projects both the second molded product 22 and the second unnecessary product 24 from the first movable mold 820A. The second unnecessary product 24 is solidified inside the mold apparatus 800 together with the second molded product 22. The second unnecessary product 24 is projected from the first movable mold 820A and then separated from the second molded product 22. The protrusion of the first unnecessary product 23 is performed in parallel with the protrusion of both the second molded product 22 and the second unnecessary product 24. After that, the mold is opened, and the turntable 520 is rotated by 180 ° again.

The movable platen 120 includes a front plate 121 that rotatably supports the turntable 520 and an intermediate block 124 arranged radially inside the cylindrical portion 524 of the turntable 520, mainly as shown in FIGS. 3 and 5. It has a rear block 126 provided behind the intermediate block 124 and a toggle link mounting portion 128 (see FIG. 7) provided on the rear end surface of the rear block 126. The front plate 121, the intermediate block 124, the rear block 126, and the toggle link mounting portion 128 may be formed separately and connected, or may be integrally formed by casting or the like.

The front plate 121 rotatably supports the turntable 520. The front plate 121 is formed with a first rod hole 122 that penetrates the front plate 121 in the mold opening / closing direction. The first ejector rod 211 is arranged in the first rod hole 122 so as to be able to advance and retreat. Further, the front plate 121 is formed with a second rod hole 123 that penetrates the front plate 121 in the mold opening / closing direction. The second ejector rod 212 is arranged in the second rod hole 123 so as to be able to advance and retreat.

The intermediate block 124 is arranged inside the cylindrical portion 524 of the turntable 520 in the radial direction. The intermediate block 124 has, for example, a columnar shape that fits inside the cylindrical portion 524 of the turntable 520 in the direction of opening and closing the mold. Inside the intermediate block 124, a space in which the first ejector device 201 is arranged and a space in which the second ejector device 202 is arranged are formed. The front plate 121 is attached to the front end surface of the intermediate block 124. The front plate 121 and the intermediate block 124 are formed with insertion holes 127 into which the rotating shaft 571 of the rotating disk 520 is inserted via the bearing 572.

The rear block 126 is provided behind the intermediate block 124 and is supported by the platen carriage 104 (see FIGS. 1 and 2). The rear block 126 has, for example, a rectangular shape. Inside the rear block 126, a space in which the first ejector device 201 is arranged and a space in which the second ejector device 202 is arranged are formed. An intermediate block 124 is attached to the front end surface of the rear block 126.

A pair of toggle link mounting portions 128 (see FIG. 7) are provided vertically on the rear end surface of the rear block 126. Each of the pair of toggle link mounting portions 128 has a plurality of toggle link mounting plates whose thickness direction faces the horizontal direction at intervals in the horizontal direction. Each of the plurality of toggle link mounting plates projects rearward from the rear end surface of the rear block 126, and has a pin hole 129 at the tip thereof. A pin is inserted through the pin hole 129, and the first link 152 (see FIGS. 1 and 2) is swingably attached to the toggle link attachment portion 128 via the pin.

The moving mechanism 102 (see FIGS. 1 and 2) moves the movable platen 120 back and forth with respect to the fixed platen 110 to close, boost, press, depressurize, and open the mold device 800. The moving mechanism 102 moves the movable platen 120 in the mold opening / closing direction with respect to the toggle support 130 arranged at a distance from the fixed platen 110, the tie bar 140 connecting the fixed platen 110 and the toggle support 130, and the toggle support 130. Toggle mechanism 150 to operate, mold clamping motor 160 to operate the toggle mechanism 150, motion conversion mechanism 170 to convert the rotational motion of the mold clamping motor 160 into linear motion, and a mold to adjust the distance between the fixed platen 110 and the toggle support 130. It has a thickness adjusting mechanism 180 and.

The toggle support 130 is arranged at a distance from the fixed platen 110, and is movably mounted on the mold clamping device frame 910 in the mold opening / closing direction. The toggle support 130 may be movably arranged along a guide laid on the mold clamping device frame 910. The guide of the toggle support 130 may be the same as that of the guide 101 of the movable platen 120.

In the present embodiment, the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle support 130 is movably arranged with respect to the mold clamping device frame 910 in the mold opening / closing direction, but the toggle support 130 is molded. It may be fixed to the device frame 910 and the fixed platen 110 may be movably arranged with respect to the mold clamping device frame 910 in the mold opening / closing direction.

The tie bar 140 connects the fixed platen 110 and the toggle support 130 at intervals L in the mold opening / closing direction. A plurality of tie bars 140 (for example, four) may be used. The plurality of tie bars 140 are arranged parallel to the mold opening / closing direction and extend according to the mold clamping force. At least one tie bar 140 may be provided with a tie bar strain detector 141 that detects the distortion of the tie bar 140. The tie bar distortion detector 141 sends a signal indicating the detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detecting the mold clamping force and the like.

In the present embodiment, the tie bar strain detector 141 is used as the mold clamping force detector for detecting the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the mounting position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is arranged between the movable platen 120 and the toggle support 130, and moves the movable platen 120 with respect to the toggle support 130 in the mold opening / closing direction. The toggle mechanism 150 includes a crosshead 151 that moves in the mold opening / closing direction, and a pair of links that bend and stretch due to the movement of the crosshead 151. Each of the pair of links has a first link 152 and a second link 153 that are flexibly connected by a pin or the like. The first link 152 is swingably attached to the movable platen 120 with a pin or the like. The second link 153 is swingably attached to the toggle support 130 with a pin or the like. The second link 153 is attached to the crosshead 151 via the third link 154. When the crosshead 151 is moved back and forth with respect to the toggle support 130, the first link 152 and the second link 153 bend and stretch, and the movable platen 120 moves back and forth with respect to the toggle support 130.

The configuration of the toggle mechanism 150 is not limited to the configurations shown in FIGS. 1 and 2. For example, in FIGS. 1 and 2, the number of nodes in each link group is 5, but it may be 4, and one end of the third link 154 is connected to the nodes of the first link 152 and the second link 153. May be done.

The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150. The mold clamping motor 160 bends and stretches the first link 152 and the second link 153 by advancing and retreating the crosshead 151 with respect to the toggle support 130, and advances and retreats the movable platen 120 with respect to the toggle support 130. The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, a pulley, or the like.

The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into a linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut.

The mold clamping device 100 performs a mold closing step, a pressure increasing step, a mold clamping step, a depressurizing step, a mold opening step, a mold rotating step, and the like under the control of the control device 700. The mold rotation step is performed after the completion of the mold opening step and before the start of the next mold closing step. In the present embodiment, the mold rotation step is performed after the completion of the ejection step, but it may be performed before the completion of the ejection process. For example, when the molding position of the second molded product 22 and the protruding position of the second molded product 22 are different, the mold rotation step is performed after the completion of the mold opening step, and then the projecting step is performed. .. Specifically, for example, when the molding position of the second molded product 22 is on the operating side and the protruding position of the second molded product 22 is on the counter-operating side, the mold is formed after the mold opening step is completed. A rotation process is performed, followed by a projecting process.

In the mold closing process, the movable platen 120 is advanced by driving the mold clamping motor 160 to advance the crosshead 151 to the mold closing completion position at the set moving speed, and the first movable mold 820A and the second movable mold are advanced. The 820B is touched with the first fixed mold 810A and the second fixed mold 810B. The position and moving speed of the crosshead 151 are detected by using, for example, a mold clamping motor encoder 161. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700.

The crosshead position detector for detecting the position of the crosshead 151 and the crosshead moving speed detector for detecting the moving speed of the crosshead 151 are not limited to the mold clamping motor encoder 161 and general ones are used. can. Further, the movable platen position detector that detects the position of the movable platen 120 and the movable platen moving speed detector that detects the moving speed of the movable platen 120 are not limited to the mold clamping motor encoder 161 and general ones are used. can.

In the boosting step, the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position to generate a mold clamping force.

In the mold clamping step, the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping step, the mold clamping force generated in the pressurizing step is maintained. In the mold clamping step, the first cavity space 801 and the second cavity space 802 are formed in the mold apparatus 800.

In the depressurization step, the mold clamping motor 160 is driven to retract the crosshead 151 from the mold clamping position to the mold opening start position, whereby the movable platen 120 is retracted and the mold clamping force is reduced. The mold opening start position and the mold closing completion position may be the same position.

In the mold opening process, the movable platen 120 is retracted by driving the mold clamping motor 160 to retract the crosshead 151 from the mold opening start position to the mold opening completion position at a set moving speed, and the first movable mold 820A and the first movable mold 820A and The second movable mold 820B is separated from the first fixed mold 810A and the second fixed mold 810B.

After the completion of the mold opening step and before the start of the next mold closing step, the ejection step is performed. In the ejection step, the first ejector device 201 projects the first unnecessary item 23 from one of the first movable mold 820A and the second movable mold 820B (the second movable mold 820B in FIG. 6). The first molded product 21 solidified together with the first unnecessary product 23 is not projected. Further, in the ejection step, the second ejector device 202 makes both the second molded product 22 and the second unnecessary product 24 the other of the first movable mold 820A and the second movable mold 820B (the first movable mold in FIG. 6). It sticks out from the mold 820A). After the ejection step is completed and before the start of the next mold closing step, the mold rotation step is performed.

In the mold rotation step, the turntable 520 is rotated, and the first molded product 21 is rotated together with one of the first movable mold 820A and the second movable mold 820B. After that, the mold closing step and the pressure raising step are performed, so that the first molded product 21 is arranged in a part of the second cavity space 802.

The setting conditions in the mold closing step, the pressurizing step, and the mold clamping step are collectively set as a series of setting conditions. For example, the moving speed and position of the crosshead 151 (including the mold closing start position, the moving speed switching position, the mold closing completion position, and the mold clamping position) and the mold clamping force in the mold closing step and the pressurizing step are set as a series of setting conditions. Is set collectively as. The mold closing start position, the moving speed switching position, the mold closing completion position, and the mold closing position are arranged in this order from the rear side to the front side, and represent the start point and the end point of the section in which the movement speed is set. The moving speed is set for each section. The movement speed switching position may be one or a plurality. The moving speed switching position does not have to be set. Only one of the mold clamping position and the mold clamping force may be set.

The setting conditions in the depressurization step and the mold opening step are also set in the same manner. For example, the moving speed and position (mold opening start position, moving speed switching position, and mold opening completion position) of the crosshead 151 in the depressurization step and the mold opening step are collectively set as a series of setting conditions. The mold opening start position, the moving speed switching position, and the mold opening completion position are arranged in this order from the front side to the rear side, and represent the start point and the end point of the section in which the movement speed is set. The moving speed is set for each section. The movement speed switching position may be one or a plurality. The moving speed switching position does not have to be set. The mold opening start position and the mold closing completion position may be the same position. Further, the mold opening completion position and the mold closing start position may be the same position.

Instead of the moving speed and position of the crosshead 151, the moving speed and position of the movable platen 120 may be set. Further, the mold clamping force may be set instead of the position of the crosshead (for example, the mold clamping position) or the position of the movable platen.

By the way, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. The amplification factor is also called the toggle magnification. The toggle magnification changes according to the angle θ (hereinafter, also referred to as “link angle θ”) formed by the first link 152 and the second link 153. The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification is maximized.

When the thickness of the mold device 800 changes due to replacement of the mold device 800, a temperature change of the mold device 800, or the like, the mold thickness is adjusted so that a predetermined mold clamping force can be obtained at the time of mold clamping. In the mold thickness adjustment, for example, the link angle θ of the toggle mechanism 150 is predetermined at the time of the mold touch when the first movable mold 820A and the second movable mold 820B touch the first fixed mold 810A and the second fixed mold 810B. The distance L between the fixed platen 110 and the toggle support 130 is adjusted so as to have an angle of.

The mold clamping device 100 has a mold thickness adjusting mechanism 180. The mold thickness adjusting mechanism 180 adjusts the mold thickness by adjusting the distance L between the fixed platen 110 and the toggle support 130. The timing of mold thickness adjustment is, for example, from the end of the molding cycle to the start of the next molding cycle. The mold thickness adjusting mechanism 180 is screwed into, for example, a screw shaft 181 formed at the rear end of the tie bar 140, a screw nut 182 that is rotatably and irreversibly held by a toggle support 130, and a screw shaft 181. It has a mold thickness adjusting motor 183 that rotates the screw nut 182.

The screw shaft 181 and the screw nut 182 are provided for each tie bar 140. The rotational driving force of the mold thickness adjusting motor 183 may be transmitted to the plurality of screw nuts 182 via the rotational driving force transmitting unit 185. A plurality of screw nuts 182 can be rotated in synchronization. By changing the transmission path of the rotation driving force transmission unit 185, it is possible to rotate the plurality of screw nuts 182 individually.

The rotary driving force transmission unit 185 is composed of, for example, a gear or the like. In this case, a passive gear is formed on the outer circumference of each screw nut 182, a drive gear is attached to the output shaft of the mold thickness adjusting motor 183, and a plurality of passive gears and an intermediate gear that meshes with the drive gear are located at the center of the toggle support 130. It is held rotatably. The rotary driving force transmission unit 185 may be composed of a belt, a pulley, or the like instead of the gear.

The operation of the mold thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjusting motor 183 to rotate the screw nut 182. As a result, the position of the toggle support 130 with respect to the tie bar 140 is adjusted, and the distance L between the fixed platen 110 and the toggle support 130 is adjusted. A plurality of mold thickness adjusting mechanisms may be used in combination.

The interval L is detected by using the mold thickness adjusting motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and the rotation direction of the mold thickness adjusting motor 183, and sends a signal indicating the detection result to the control device 700. The detection result of the mold thickness adjustment motor encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130. The toggle support position detector that detects the position of the toggle support 130 and the interval detector that detects the interval L are not limited to the mold thickness adjustment motor encoder 184, and general ones can be used.

The mold clamping device 100 of the present embodiment is a horizontal type in which the mold opening / closing direction is horizontal, but may be a vertical type in which the mold opening / closing direction is in the vertical direction.

The mold clamping device 100 of the present embodiment has a mold clamping motor 160 as a drive source, but may have a hydraulic cylinder instead of the mold clamping motor 160. Further, the mold clamping device 100 may have a linear motor for opening and closing the mold and an electromagnet for mold clamping.

(1st ejector device and 2nd ejector device)
In the description of the first ejector device 201 and the second ejector device 202, the moving direction (for example, the X-axis positive direction) of the movable platen 120 when the mold is closed is set to the front as in the description of the mold clamping device 100, and the mold is opened. The moving direction of the movable platen 120 (for example, the negative direction of the X-axis) will be described as the rear.

The first ejector device 201 and the second ejector device 202 advance and retreat together with the movable platen 120. The first ejector device 201 projects the first unnecessary item 23 from one of the first movable mold 820A and the second movable mold 820B (the second movable mold 820B in FIG. 6). At this time, the first ejector device 201 does not project the first molded product 21 solidified together with the first unnecessary product 23. The second ejector device 202 projects both the second molded product 22 and the second unnecessary product 24 from the other of the first movable mold 820A and the second movable mold 820B (the first movable mold 820A in FIG. 6). ..

The first ejector device 201 and the second ejector device 202 are arranged at intervals in the Y-axis direction. This is because the first cavity space 801 and the second cavity space 802 are arranged at intervals in the Y-axis direction.

For example, the first cavity space 801 and the first ejector device 201 are arranged on the operation side. The second cavity space 802 and the second ejector device 202 are arranged on the opposite side. The second molded product 22 can be taken out to the opposite side.

First, the configuration of the first movable mold 820A will be described mainly with reference to FIGS. 4 and 6. The first movable mold 820A includes a fixed portion 830A fixed to the movable platen 120, a first movable portion 840A that projects both the first unnecessary item 23 and the second unnecessary item 24 from the fixed portion 830A, and a fixed portion 830A. It has a second movable portion 850A and a second movable portion 850A, which protrudes from the second molded product 22.

The fixing portion 830A is a movable type fixed to the movable mounting plate 831A attached to the turntable 520, a spacer block 835A forming a space 834A in front of the movable mounting plate 831A, and the movable mounting plate 831A via the spacer block 835A. Includes plate 836A and guide pin 839A.

The movable mounting plate 831A is formed with a through hole 832A into which the first ejector rod 211 and the second ejector rod 212 are inserted and removed in order. The diameter of the through hole 832A is larger than the diameter of the first ejector rod 211 and the diameter of the second ejector rod 212.

The spacer block 835A forms a space 834A between the movable mounting plate 831A and the movable template plate 836A. In this space 834A, the first ejector plate 841A described later and the second ejector plate 851A described later are arranged so as to be able to advance and retreat.

The movable template 836A forms a part of the wall surface of the first cavity space 801 and a part of the wall surface of the second cavity space 802 in order on the front end surface.

The first movable portion 840A includes, for example, a first ejector plate 841A arranged perpendicular to the mold opening / closing direction, and a rod-shaped first ejector pin 842A extending forward from the first ejector plate 841A.

The first ejector plate 841A is arranged in the space 834A between the movable mounting plate 831A and the movable template plate 836A. The first ejector plate 841A advances and retreats along the guide pin 839A parallel to the mold opening / closing direction. The first ejector plate 841A is urged by the first return spring 845A in a direction away from the movable template 836A.

The first ejector pin 842A is freely arranged in the first pin hole penetrating the movable mold plate 836A in the mold opening / closing direction. The front end surface of the first ejector pin 842A comes into contact with the first unnecessary item 23 or the second unnecessary item 24.

The second movable portion 850A includes, for example, a second ejector plate 851A arranged perpendicular to the mold opening / closing direction, and a rod-shaped second ejector pin 852A extending forward from the second ejector plate 851A.

The second ejector plate 851A is arranged in the space 834A between the movable mounting plate 831A and the movable template plate 836A. The second ejector plate 851A advances and retreats along the guide pin 839A parallel to the mold opening / closing direction. The second ejector plate 851A is urged by the second return spring 855A in a direction away from the movable template 836A.

The second ejector plate 851A is arranged between the movable mounting plate 831A and the first ejector plate 841A. When the second ejector plate 851A moves forward and backward, the first ejector plate 841A moves forward and backward together with the second ejector plate 851A.

The second ejector plate 851A is formed with a through hole 856A that penetrates the second ejector plate 851A in the mold opening / closing direction. The diameter of the through hole 856A is smaller than the diameter of the second ejector rod 212. The second ejector rod 212 pushes the second ejector plate 851A forward without passing through the through hole 856A of the second ejector plate 851A.

The diameter of the through hole 856A of the second ejector plate 851A is larger than the diameter of the first ejector rod 211. The first ejector rod 211 passes through the through hole 856A of the second ejector plate 851A and pushes the first ejector plate 841A forward.

The second ejector pin 852A is freely arranged in the second pin hole that penetrates the movable template 836A in the mold opening / closing direction. The front end surface of the second ejector pin 852A comes into contact with the first molded product 21 or the second molded product 22.

Like the first movable mold 820A, the second movable mold 820B projects both the fixed portion 830B fixed to the movable platen 120 and both the first unnecessary item 23 and the second unnecessary item 24 from the fixed portion 830B. It has a first movable portion 840B and a second movable portion 850B that projects the second molded product 22 from the fixed portion 830B. Since the second movable mold 820B is configured in the same manner as the first movable mold 820A, the description thereof will be omitted.

Next, the operation of the first ejector device 201 and the operation of the first ejector device 201 pushing out the first unnecessary item 23 from the first movable mold 820A will be described mainly with reference to FIG. The first ejector device 201 not only pushes out the first unnecessary item 23 from the first movable mold 820A, but also pushes out the first unnecessary item 23 from the second movable mold 820B. Since the latter operation is performed in the same manner as the former operation, the description thereof will be omitted.

The first ejector device 201 has a first ejector rod 211 that pushes only the first movable portion 840A of the first movable portion 840A and the second movable portion 850A. The first ejector rod 211 is not connected to the first movable portion 840A. The first ejector rod 211 can be pulled out from the turntable 520, and the turntable 520 can be rotated.

The first ejector device 201 has a first drive mechanism 220 that advances and retreats the first ejector rod 211. The first drive mechanism 220 includes, for example, a first ejector motor 221 and a first crosshead 223, and a first motion conversion mechanism 225 that converts the rotational motion of the first ejector motor 221 into a linear motion of the first crosshead 223. Has.

The first motion conversion mechanism 225 includes a screw shaft and a screw nut screwed onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut. The first crosshead 223 moves in the mold opening / closing direction along the first guide bar 224. The rear end portion of the first ejector rod 211 is attached to the first crosshead 223, and the first ejector rod 211 advances and retreats together with the first crosshead 223.

When the first drive mechanism 220 advances the first ejector rod 211 as shown in FIG. 4, the first ejector rod 211 passes through the through hole 832A of the movable mounting plate 831A and the through hole 856A of the second ejector plate 851A. , Push the first ejector plate 841A forward. As a result, the first ejector plate 841A advances against the urging force of the first return spring 845A. Therefore, the first ejector pin 842A advances and the first unnecessary item 23 protrudes from the fixing portion 830A.

While the first drive mechanism 220 advances the first ejector plate 841A together with the first ejector rod 211 as shown in FIG. 4, the second ejector plate 851A is held in the retracted limit position by the urging force of the second return spring 855A. , Do not move forward. Therefore, when the first unnecessary product 23 is projected from the fixed portion 830A, the first molded product 21 is not projected from the fixed portion 830A.

After that, when the first drive mechanism 220 retracts the first ejector rod 211, the first ejector plate 841A is retracted to the retracted limit position by the urging force of the first return spring 845A. When the first ejector plate 841A reaches the retracted limit position, the front end surface of the first ejector pin 842A becomes flush with the front end surface of the fixing portion 830A.

The control device 700 controls the position of the first ejector rod 211 when the first ejector rod 211 is moved forward and backward. The position of the first ejector rod 211 is detected by using, for example, the first ejector motor encoder 222. The first ejector motor encoder 222 detects the rotation of the first ejector motor 221 and sends a signal indicating the detection result to the control device 700. The first ejector rod position detector that detects the position of the first ejector rod 211 is not limited to the first ejector motor encoder 222, and a general one can be used.

Next, the operation of the second ejector device 202 and the operation of the second ejector device 202 pushing out the second molded product 22 and the second unnecessary product 24 from the first movable mold 820A will be described mainly with reference to FIG. The second ejector device 202 not only pushes out the second molded product 22 and the second unnecessary product 24 from the first movable mold 820A, but also pushes out the second molded product 22 and the second unnecessary product 24 from the second movable mold 820B. The operation of sticking out the product 24 is also carried out. Since the latter operation is performed in the same manner as the former operation, the description thereof will be omitted.

The second ejector device 202 has a second ejector rod 212 that pushes the first movable portion 840A and the second movable portion 850A. The second ejector rod 212 is not connected to the first movable portion 840A and the second movable portion 850A. The second ejector rod 212 can be pulled out from the turntable 520, and the turntable 520 can be rotated.

The second ejector device 202 has a second drive mechanism 230 that advances and retreats the second ejector rod 212. The second drive mechanism 230 includes, for example, a second ejector motor 231 and a second crosshead 233, and a second motion conversion mechanism 235 that converts the rotational motion of the second ejector motor 231 into a linear motion of the second crosshead 233. Has.

The second motion conversion mechanism 235 includes a screw shaft and a screw nut screwed onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut. The second crosshead 233 moves in the mold opening / closing direction along the second guide bar 234. The rear end portion of the second ejector rod 212 is attached to the second crosshead 233, and the second ejector rod 212 advances and retreats together with the second crosshead 233.

When the second drive mechanism 230 advances the second ejector rod 212 as shown in FIG. 6, the second ejector rod 212 passes through the through hole 832A of the movable mounting plate 831A and passes through the through hole 856A of the second ejector plate 851A. Push the edge forward. As a result, the second ejector plate 851A advances against the urging force of the second return spring 855A. Therefore, the second ejector pin 852A advances and the second molded product 22 protrudes from the fixed portion 830A.

While the second drive mechanism 230 advances the second ejector plate 851A together with the second ejector rod 212, the first ejector plate 841A advances against the urging force of the first return spring 845A. Therefore, the first ejector pin 842A advances and the second unnecessary item 24 protrudes from the fixing portion 830A.

After that, when the second drive mechanism 230 retracts the second ejector rod 212, the second ejector plate 851A is retracted to the retracted limit position by the urging force of the second return spring 855A. When the second ejector plate 851A reaches the retracted limit position, the front end surface of the second ejector pin 852A becomes flush with the front end surface of the fixing portion 830A.

While the second ejector plate 851A is retracted, the first ejector plate 841A is retracted to the retracted limit position by the urging force of the first return spring 845A. When the first ejector plate 841A reaches the retracted limit position, the front end surface of the first ejector pin 842A becomes flush with the front end surface of the fixing portion 830A.

The control device 700 controls the position of the second ejector rod 212 when the second ejector rod 212 is moved forward and backward. The position of the second ejector rod 212 is detected by using, for example, the second ejector motor encoder 232. The second ejector motor encoder 232 detects the rotation of the second ejector motor 231 and sends a signal indicating the detection result to the control device 700. The second ejector rod position detector that detects the position of the second ejector rod 212 is not limited to the second ejector motor encoder 232, and a general one can be used.

(1st injection device and 2nd injection device)
In the description of the first injection device 301 and the second injection device 302, unlike the description of the mold clamping device 100 and the like, the moving direction of the screw 330 at the time of filling (for example, the negative direction of the X-axis) is set to the front, and the screw 330 at the time of weighing. The moving direction of (for example, the positive direction of the X-axis) will be described as the rear.

The first slide base 301 is installed on the first slide base 303, and the first slide base 303 is arranged so as to be able to advance and retreat with respect to the injection device frame 920. The first injection device 301 is arranged so as to be able to move forward and backward with respect to the mold device 800. The first injection device 301 touches the first fixed mold 810A of the mold device 800 to fill the first cavity space 801 in the mold device 800 with a molding material.

The second slide base 302 is installed on the second slide base, and the second slide base is arranged so as to be able to advance and retreat with respect to the injection device frame 920. The second injection device 302 is arranged so as to be able to move forward and backward with respect to the mold device 800. The second injection device 302 touches the second fixed mold 810B of the mold device 800 to fill the second cavity space 802 in the mold device 800 with the molding material.

The first injection device 301 and the second injection device 302 are arranged at intervals in the Y-axis direction. This is because the first cavity space 801 and the second cavity space 802 are arranged at intervals in the Y-axis direction. The molding material that the first injection device 301 fills in the first cavity space 801 and the molding material that the second injection device 302 fills in the second cavity space 802 may be different materials or may be the same material.

The first injection device 301 and the second injection device 302 are configured in the same manner. Therefore, the configuration of the first injection device 301 will be described below, and the description of the configuration of the second injection device 302 will be omitted. As shown in FIGS. 1 and 2, for example, the first injection device 301 has a cylinder 310 for heating a molding material, a nozzle 320 provided at the front end of the cylinder 310, and is rotatable and retractable in the cylinder 310. The screw 330 arranged in the screw 330, the measuring motor 340 for rotating the screw 330, the injection motor 350 for advancing and retreating the screw 330, and the pressure detector 360 for detecting the force transmitted between the injection motor 350 and the screw 330. Has.

The cylinder 310 heats the molding material supplied internally from the supply port 311. The molding material includes, for example, a resin. The molding material is formed, for example, in the form of pellets and is supplied to the supply port 311 in a solid state. The supply port 311 is formed at the rear of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear portion of the cylinder 310. A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 in front of the cooler 312.

The cylinder 310 is divided into a plurality of zones in the axial direction (for example, the X-axis direction) of the cylinder 310. A heater 313 and a temperature detector 314 are provided in each of the plurality of zones. The control device 700 controls the heater 313 so that the set temperature is set in each of the plurality of zones and the detected temperature of the temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310 and is pressed against the mold device 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the detected temperature of the nozzle 320 reaches the set temperature.

The screw 330 is rotatably and rotatably arranged in the cylinder 310. When the screw 330 is rotated, the molding material is fed forward along the spiral groove of the screw 330. The molding material is gradually melted by the heat from the cylinder 310 while being fed forward. As the liquid molding material is fed forward of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. After that, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is ejected from the nozzle 320 and filled in the mold apparatus 800.

A backflow prevention ring 331 is freely attached to the front portion of the screw 330 as a backflow prevention valve for preventing the backflow of the molding material from the front to the rear of the screw 330 when the screw 330 is pushed forward.

When the backflow prevention ring 331 is advanced, the backflow prevention ring 331 is pushed backward by the pressure of the molding material in front of the screw 330, and is relative to the screw 330 up to a closing position (see FIG. 2) that blocks the flow path of the molding material. fall back. As a result, the molding material accumulated in the front of the screw 330 is prevented from flowing backward.

On the other hand, the backflow prevention ring 331 is pushed forward by the pressure of the molding material sent forward along the spiral groove of the screw 330 when the screw 330 is rotated, and the opening position opens the flow path of the molding material. Advance relative to screw 330 to (see FIG. 1). As a result, the molding material is sent to the front of the screw 330.

The backflow prevention ring 331 may be either a co-rotation type that rotates with the screw 330 or a non-co-rotation type that does not rotate with the screw 330.

The first injection device 301 may have a drive source for moving the backflow prevention ring 331 forward and backward between the open position and the closed position with respect to the screw 330.

The metering motor 340 rotates the screw 330. The drive source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

The injection motor 350 advances and retreats the screw 330. Between the injection motor 350 and the screw 330, a motion conversion mechanism or the like for converting the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism has, for example, a screw shaft and a screw nut screwed onto the screw shaft. A ball, a roller, or the like may be provided between the screw shaft and the screw nut. The drive source for advancing and retreating the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

The pressure detector 360 detects the force transmitted between the injection motor 350 and the screw 330. The detected force is converted into pressure by the control device 700. The pressure detector 360 is provided in the force transmission path between the injection motor 350 and the screw 330 to detect the force acting on the pressure detector 360.

The pressure detector 360 sends a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used for controlling and monitoring the pressure received by the screw 330 from the molding material, the back pressure on the screw 330, the pressure acting on the molding material from the screw 330, and the like.

The first injection device 301 performs a weighing step, a filling step, a pressure holding step, and the like under the control of the control device 700. The filling process and the pressure holding process may be collectively referred to as an injection process.

In the weighing step, the weighing motor 340 is driven to rotate the screw 330 at a set rotation speed, and the molding material is fed forward along the spiral groove of the screw 330. Along with this, the molding material is gradually melted. As the liquid molding material is fed forward of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. The rotation speed of the screw 330 is detected using, for example, a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340 and sends a signal indicating the detection result to the control device 700. The screw rotation speed detector that detects the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a general screw can be used.

In the weighing step, the injection motor 350 may be driven to apply a set back pressure to the screw 330 in order to limit the sudden retreat of the screw 330. The back pressure on the screw 330 is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. When the screw 330 retracts to the weighing completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the weighing process is completed.

The position and rotation speed of the screw 330 in the weighing process are collectively set as a series of setting conditions. For example, the weighing start position, the rotation speed switching position, and the weighing completion position are set. These positions are arranged in this order from the front side to the rear side, and represent the start point and the end point of the section in which the rotation speed is set. The rotation speed is set for each section. The rotation speed switching position may be one or a plurality. The rotation speed switching position does not have to be set. In addition, back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set moving speed, and the liquid molding material accumulated in front of the screw 330 is filled in the first cavity space 801 in the mold apparatus 800. The position and moving speed of the screw 330 are detected using, for example, an injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700. When the position of the screw 330 reaches the set position, switching from the filling process to the pressure holding process (so-called V / P switching) is performed. The position where V / P switching is performed is also called the V / P switching position. The set moving speed of the screw 330 may be changed according to the position and time of the screw 330.

The position and moving speed of the screw 330 in the filling step are collectively set as a series of setting conditions. For example, the filling start position (also referred to as “injection start position”), the moving speed switching position, and the V / P switching position are set. These positions are arranged in this order from the rear side to the front side, and represent the start point and the end point of the section in which the movement speed is set. The moving speed is set for each section. The movement speed switching position may be one or a plurality. The moving speed switching position does not have to be set.

The upper limit of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set. The pressure of the screw 330 is detected by the pressure detector 360. When the detected value of the pressure detector 360 is equal to or less than the set pressure, the screw 330 is advanced at the set moving speed. On the other hand, when the detected value of the pressure detector 360 exceeds the set pressure, the screw 330 has a moving speed slower than the set moving speed so that the detected value of the pressure detector 360 is equal to or lower than the set pressure for the purpose of mold protection. To move forward.

After the position of the screw 330 reaches the V / P switching position in the filling step, the screw 330 may be temporarily stopped at the V / P switching position, and then the V / P switching may be performed. Immediately before the V / P switching, instead of stopping the screw 330, the screw 330 may be moved forward or backward at a slow speed. Further, the screw position detector for detecting the position of the screw 330 and the screw moving speed detector for detecting the moving speed of the screw 330 are not limited to the injection motor encoder 351 and general ones can be used.

In the pressure holding step, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material (hereinafter, also referred to as “holding pressure”) at the front end of the screw 330 is maintained at a set pressure in the cylinder 310. The remaining molding material is pushed toward the mold device 800. The shortage of molding material due to cooling shrinkage in the mold apparatus 800 can be replenished. The holding pressure is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. The set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure step and the like. A plurality of holding pressures and holding times for holding the holding pressures in the holding pressure step may be set respectively, and may be collectively set as a series of setting conditions.

In the pressure holding step, the molding material in the first cavity space 801 in the mold apparatus 800 is gradually cooled, and when the pressure holding step is completed, the inlet of the first cavity space 801 is closed with the solidified molding material. This state is called a gate seal, and the backflow of the molding material from the first cavity space 801 is prevented. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the first cavity space 801 is solidified. A weighing step may be performed during the cooling step for the purpose of shortening the molding cycle time.

The first injection device 301 of the present embodiment is an in-line screw system, but may be a pre-plastic system or the like. The pre-plastic injection device supplies the molded material melted in the plasticized cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. In the plasticized cylinder, a screw is rotatably and irreversibly arranged, or a screw is rotatably and movably arranged. On the other hand, a plunger is arranged in the injection cylinder so as to be able to move forward and backward.

Further, the first injection device 301 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is horizontal, but may be a vertical type in which the axial direction of the cylinder 310 is in the vertical direction. The mold clamping device combined with the vertical type first injection device 301 may be vertical type or horizontal type. Similarly, the mold clamping device combined with the horizontal first injection device 301 may be horizontal or vertical.

(1st mobile device and 2nd mobile device)
In the description of the first moving device 401 and the second moving device (not shown), the moving direction of the screw 330 at the time of filling (for example, the negative direction of the X-axis) is the same as the description of the first injection device 301 and the second injection device 302. Will be described as the front, and the moving direction of the screw 330 during weighing (for example, the positive direction of the X-axis) will be described as the rear.

The first moving device 401 advances and retreats the first injection device 301 with respect to the mold device 800. Further, the first moving device 401 presses the nozzle 320 of the first injection device 301 against the mold device 800 to generate a nozzle touch pressure.

The second moving device advances and retreats the second injection device 302 with respect to the mold device 800. Further, the second moving device presses the nozzle of the second injection device 302 against the mold device 800 to generate a nozzle touch pressure.

The first moving device 401 and the second moving device are arranged at intervals in the Y-axis direction. The first moving device 401 and the second moving device move the first injection device 301 and the second injection device 302 independently.

The first mobile device 401 and the second mobile device are configured in the same manner. Therefore, the configuration of the first mobile device 401 will be described below, and the description of the configuration of the second mobile device will be omitted. As shown in FIGS. 1 and 2, the first moving device 401 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a pump that can rotate in both directions, and by switching the rotation direction of the motor 420, the hydraulic fluid (for example, oil) is sucked from one of the first port 411 and the second port 412 and discharged from the other. To generate hydraulic pressure. The hydraulic pump 410 can also suck the hydraulic fluid from the tank and discharge the hydraulic fluid from either the first port 411 or the second port 412.

The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 in the rotational direction and rotational torque according to the control signal from the control device 700. The motor 420 may be an electric motor or an electric servomotor.

The hydraulic cylinder 430 has a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed to the first injection device 301. The piston 432 divides the inside of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. The piston rod 433 is fixed to the fixed platen 110.

The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via the first flow path 413. The hydraulic fluid discharged from the first port 411 is supplied to the anterior chamber 435 via the first flow path 413, so that the first injection device 301 is pushed forward. The first injection device 301 is advanced, and the nozzle 320 of the first injection device 301 is pressed against the first fixed mold 810A. The anterior chamber 435 functions as a pressure chamber that generates a nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410.

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via the second flow path 414. The hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 via the second flow path 414, so that the first injection device 301 is pushed rearward. The first injection device 301 is retracted, and the nozzle 320 of the first injection device 301 is separated from the first fixed mold 810A.

In the present embodiment, the first moving device 401 includes the hydraulic cylinder 430, but the present invention is not limited to this. For example, instead of the hydraulic cylinder 430, an electric motor and a motion conversion mechanism that converts the rotational motion of the electric motor into a linear motion of the first injection device 301 may be used.

(Control device)
The control device 700 is composed of, for example, a computer, and has a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704 as shown in FIGS. The control device 700 performs various controls by causing the CPU 701 to execute the program stored in the storage medium 702. Further, the control device 700 receives a signal from the outside through the input interface 703 and transmits the signal to the outside through the output interface 704.

The control device 700 repeatedly performs a weighing process, a mold closing process, a pressure increasing process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a depressurizing process, a mold opening process, a protrusion process, a mold rotation process, and the like. , The first molded product 21 and the second molded product 22 are repeatedly manufactured. A series of operations for obtaining the first molded product 21 and the second molded product 22, for example, an operation from the start of the weighing process to the start of the next measuring process is also referred to as a "shot" or a "molding cycle". Further, the time required for one shot is also referred to as "molding cycle time" or "cycle time".

A single molding cycle includes, for example, a weighing process, a mold closing process, a pressure increasing process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a depressurizing process, a mold opening process, a protrusion process, and a mold rotation process. Have in order. The order here is the order of starting each process. The filling, holding, and cooling steps are performed during the mold clamping step. The start of the mold clamping step may coincide with the start of the filling step. The end of the depressurization process coincides with the start of the mold opening process.

In addition, a plurality of steps may be performed at the same time for the purpose of shortening the molding cycle time. For example, the weighing step may be performed during the cooling step of the previous molding cycle or during the mold clamping step. In this case, the mold closing step may be performed at the beginning of the molding cycle. Further, the filling step may be started during the mold closing step. Further, the ejection step may be started during the mold opening step. If an on-off valve that opens and closes the flow path of the nozzle 320 is provided, the mold opening step may be started during the weighing step. This is because even if the mold opening process is started during the measuring process, if the on-off valve closes the flow path of the nozzle 320, the molding material does not leak from the nozzle 320.

In addition, one molding cycle is other than the weighing process, the mold closing process, the pressure increasing process, the mold clamping process, the filling process, the pressure holding process, the cooling process, the depressurizing process, the mold opening process, the protrusion process, and the mold rotation process. It may have a process.

For example, after the completion of the pressure holding step and before the start of the weighing step, a pre-weighing suckback step of retracting the screw 330 to a preset weighing start position may be performed. The pressure of the molding material accumulated in front of the screw 330 before the start of the weighing process can be reduced, and the screw 330 can be prevented from suddenly retreating at the start of the weighing process.

Further, after the completion of the weighing step and before the start of the filling step, a post-weighing suckback step may be performed in which the screw 330 is retracted to a preset filling start position (also referred to as “injection start position”). The pressure of the molding material accumulated in front of the screw 330 before the start of the filling step can be reduced, and the leakage of the molding material from the nozzle 320 before the start of the filling step can be prevented.

The control device 700 is connected to an operation device 750 that accepts an input operation by a user and a display device 760 that displays a display screen. The operation device 750 and the display device 760 may be composed of, for example, a touch panel and may be integrated. The touch panel as the display device 760 displays the display screen under the control of the control device 700. Information such as the setting of the injection molding machine 10 and the current state of the injection molding machine 10 may be displayed on the display screen of the touch panel. Further, on the display screen of the touch panel, for example, an input operation unit such as a button for accepting an input operation by a user or an input field may be displayed. The touch panel as the operation device 750 detects an input operation on the display screen by the user and outputs a signal corresponding to the input operation to the control device 700. As a result, for example, the user operates the input operation unit provided on the display screen while checking the information displayed on the display screen to set the injection molding machine 10 (including inputting the set value) and the like. It can be carried out. Further, the user can operate the injection molding machine 10 corresponding to the input operation unit by operating the input operation unit provided on the display screen. The operation of the injection molding machine 10 is, for example, the mold clamping device 100, the first ejector device 201, the second ejector device 202, the first injection device 301, the second injection device 302, the first moving device 401, and the second moving. It may be an operation (including stopping) of a device (not shown) or the like. Further, the operation of the injection molding machine 10 may be switching of a display screen displayed on a touch panel as a display device 760 or the like.

Although the operation device 750 and the display device 760 of the present embodiment have been described as being integrated as a touch panel, they may be provided independently. Further, a plurality of operating devices 750 may be provided. The operating device 750 and the display device 760 are arranged on the operating side (Y-axis negative direction) of the mold clamping device 100 (more specifically, the fixed platen 110).

(Die installation)
FIG. 8 is a horizontal cross-sectional view showing an example of the correct mounting procedure of the mold. FIG. 9 is a horizontal cross-sectional view showing an example of a correct mounting procedure of the mold, following FIG. 8 (A) shows the first work, FIG. 8 (B) shows the second work, FIG. 8 (C) shows the third work, and FIG. 8 (D) shows the fourth work. (A) shows the fifth work, FIG. 9 (B) shows the sixth work, and FIG. 9 (C) shows the seventh work.

The first to fourth operations shown in FIGS. 8 (A) to 8 (D) are performed in a state where the rotation angle of the turntable 520 is fixed to the first rotation angle. The fifth operation shown in FIG. 9A is an operation of changing the rotation angle of the turntable 520 from the first rotation angle to the second rotation angle. The sixth to seventh operations shown in FIGS. 9 (B) to 9 (C) are performed in a state where the rotation angle of the turntable 520 is fixed to the second rotation angle.

First, as shown in FIG. 8A, the operator positions the first movable mold 820A with respect to the turntable 520 with the positioning pin 861A. The positioning pin 861A is inserted into the positioning hole 862A of the movable mounting plate 831A and the positioning hole 525A of the turntable 520. The number of positioning pins 861A may be a plurality. The movable mounting plate 831A may include a flange that protrudes outward from the spacer block 835A in the direction of opening and closing the mold, and a positioning hole 862A may be formed in the flange. In this case, the positioning pin 861A is attached to the flange of the movable mounting plate 831A.

Further, the operator finally tightens the bolt 822A that fixes the first movable mold 820A to the turntable 520. The bolt 822A is inserted into the insertion hole 823A of the movable mounting plate 831A and screwed into the bolt hole 521A of the turntable 520. The number of bolts 822A may be a plurality. The diameter of the insertion hole 823A of the movable mounting plate 831A is larger than the outer diameter of the screw shaft of the bolt 822A. Since the bolt 822A is finally tightened, the position of the first movable mold 820A is fixed. The movable mounting plate 831A may include a flange that protrudes outward from the spacer block 835A in the direction of opening and closing the mold, and an insertion hole 823A may be formed in the flange. In this case, the bolt 822A fastens the flange of the movable mounting plate 831A and the turntable 520.

Furthermore, the operator temporarily tightens the bolt 822B that fixes the second movable mold 820B to the turntable 520. The bolt 822B is inserted into the insertion hole 823B of the movable mounting plate 831B and screwed into the bolt hole 521B of the turntable 520. The number of bolts 822B may be plural. Since the diameter of the insertion hole 823B of the movable mounting plate 831B is larger than the outer diameter of the screw shaft of the bolt 822B and the bolt 822B is temporarily tightened, the position of the second movable mold 820B can be adjusted. The movable mounting plate 831B may include a flange that protrudes outward from the spacer block 835B in the direction of opening and closing the mold, and an insertion hole 823B may be formed in the flange. In this case, the bolt 822B fastens the flange of the movable mounting plate 831B to the turntable 520.

Next, as shown in FIG. 8B, the operator can fit the first movable mold 820A and the first fixed mold 810A, and the second movable mold 820B and the second fixed mold 810B. The rotating disk 520 is advanced by the moving mechanism 102 in the state where the and the die are fitted. As a result, the first fixed mold 810A and the second fixed mold 810B are brought into contact with the fixed platen 110.

In a state where the first movable mold 820A and the first fixed mold 810A are fitted, the guide pin 821A of the first movable mold 820A and the guide hole 811A of the first fixed mold 810A are fitted. .. The arrangement of the guide pin 821A and the guide hole 811A may be reversed, and the guide pin 821A may be provided in the first fixed mold 810A and the guide hole 811A may be provided in the first movable mold 820A. Further, the number of guide pins 821A and guide holes 811A may be plural.

Further, in a state where the second movable mold 820B and the second fixed mold 810B are fitted, the guide pin 821B of the second movable mold 820B and the guide hole 811B of the second fixed mold 810B are fitted. ing. The arrangement of the guide pin 821B and the guide hole 811B may be reversed, and the guide pin 821B may be provided in the second fixed mold 810B and the guide hole 811B may be provided in the second movable mold 820B. Further, the number of guide pins 821B and guide holes 811B may be plural.

Next, as shown in FIG. 8C, the operator finally tightens the bolt 812A that fixes the first fixing mold 810A to the fixing platen 110. The bolt 812A is inserted into the insertion hole 813A of the fixed mounting plate 871A and screwed into the bolt hole 111A of the fixed platen 110. The number of bolts 812A may be a plurality. The diameter of the insertion hole 813A of the fixed mounting plate 871A is larger than the outer diameter of the screw shaft of the bolt 812A. Since the bolt 812A is finally tightened, the position of the first fixing mold 810A is fixed. The fixed mounting plate 871A may include a flange that protrudes outward from the intermediate plate 875A in the mold opening / closing direction, and an insertion hole 813A may be formed in the flange. In this case, the bolt 812A fastens the flange of the fixed mounting plate 871A to the turntable 520.

Further, the operator temporarily tightens the bolt 812B for fixing the second fixing mold 810B to the fixing platen 110. The bolt 812B is inserted into the insertion hole 813B of the fixed mounting plate 871B and screwed into the bolt hole 111B of the fixed platen 110. The number of bolts 812B may be a plurality. Since the diameter of the insertion hole 813B of the fixed mounting plate 871B is larger than the outer diameter of the screw shaft of the bolt 812B and the bolt 812B is temporarily tightened, the position of the second fixing mold 810B can be adjusted. The fixed mounting plate 871B may include a flange that protrudes outward from the intermediate plate 875B in the mold opening / closing direction, and an insertion hole 813B may be formed in the flange. In this case, the bolt 812B fastens the flange of the fixed mounting plate 871B to the turntable 520.

Next, as shown in FIG. 8D, the operator retracts the turntable 520 by the moving mechanism 102. As a result, the fitting of the first movable mold 820A and the first fixed mold 810A is released. Further, the fitting of the second movable mold 820B and the second fixed mold 810B is released.

Next, as shown in FIG. 9A, the operator rotates the rotary disk 520 by the rotation mechanism 530 and changes the rotation angle of the rotary disk 520 from the first rotation angle to the second rotation angle. As a result, the first movable mold 820A and the second fixed mold 810B face each other, and the second movable mold 820B and the first fixed mold 810A face each other.

Next, as shown in FIG. 9B, the operator advances the turntable 520 by the moving mechanism 102. As a result, the first movable mold 820A and the second fixed mold 810B are fitted, and the second movable mold 820B and the first fixed mold 810A are fitted.

For example, the guide pin 821A of the first movable mold 820A and the guide hole 811B of the second fixed mold 810B are fitted. The first movable mold 820A is already fixed, while the second fixed mold 810B is temporarily fixed. Therefore, the position of the second fixed mold 810B is corrected by fitting the guide pin 821A and the guide hole 811B.

Further, the guide pin 821B of the second movable mold 820B and the guide hole 811A of the first fixed mold 810A are fitted. The first fixed mold 810A is already fixed, while the second movable mold 820B is temporarily fixed. Therefore, the position of the second movable mold 820B is corrected by fitting the guide pin 821B and the guide hole 811A.

Next, as shown in FIG. 9C, the operator finally tightens the bolt 812B that fixes the second fixing mold 810B to the fixing platen 110. Further, the operator finally tightens the bolt 822B for fixing the second movable mold 820B to the turntable 520. As a result, the work of attaching the first fixed mold 810A, the second fixed mold 810B, the first movable mold 820A, and the second movable mold 820B is completed.

According to the above correct mounting procedure, the mounting position of the first fixed mold 810A is first determined with reference to the mounting position of the first movable mold 820A. After that, the mounting position of the second movable mold 820B is determined with reference to the mounting position of the first fixed mold 810A. Further, the mounting position of the second fixed mold 810B is determined with reference to the mounting position of the first movable mold 820A.

That is, according to the above-mentioned correct mounting procedure, the mounting positions of all the remaining molds 810A, 810B, and 820B are determined with reference to the mounting position of one mold 820A. Therefore, even if the combination of the movable mold and the fixed mold to be fitted changes due to the rotation of the turntable 520, the fitting is smooth.

In the above correct mounting procedure, the first movable mold 820A was selected as the mold to be fixed first, but the second movable mold 820B, the first fixed mold 810A, or the second fixed mold 810B was used. You may choose. In any case, the mounting positions of all the remaining molds may be determined based on the mounting position of one mold.

FIG. 10 is a horizontal cross-sectional view showing an example of an erroneous mounting procedure of the mold. 10 (A) shows the first work, FIG. 10 (B) shows the second work, and FIG. 10 (C) shows the third work. The wrong mounting procedure requires less work than the correct mounting procedure. Therefore, correct mounting procedures may not be adhered to. The first to third operations shown in FIGS. 10A to 10C are performed in a state where the rotation angle of the turntable 520 is fixed to the first rotation angle.

First, as shown in FIG. 10A, the operator positions the first movable mold 820A with respect to the turntable 520 with the positioning pin 861A. Further, the operator finally tightens the bolt 822A that fixes the first movable mold 820A to the turntable 520. These operations are also performed with the correct mounting procedure. However, in the wrong mounting procedure, the operator tightens the bolt 822B that fixes the second movable mold 820B to the turntable 520, instead of temporarily tightening it.

Next, as shown in FIG. 10B, the operator can fit the first movable mold 820A and the first fixed mold 810A, and the second movable mold 820B and the second fixed mold 810B. The rotating disk 520 is advanced by the moving mechanism 102 in the state where the and the die are fitted. As a result, the first fixed mold 810A and the second fixed mold 810B are brought into contact with the fixed platen 110.

Next, as shown in FIG. 10C, the operator finally tightens the bolt 812A that fixes the first fixing mold 810A to the fixing platen 110. Further, the operator does not temporarily tighten the bolt 812B that fixes the second fixing mold 810B to the fixed platen 110, but finally tightens it. As a result, the work of attaching the first fixed mold 810A, the second fixed mold 810B, the first movable mold 820A, and the second movable mold 820B is completed.

According to the above erroneous mounting procedure, the mounting positions of some molds 810A and 820A and the mounting positions of the remaining molds 810B and 820B are separately determined. Therefore, if the combination of the movable mold and the fixed mold to be fitted changes due to the rotation of the turntable 520, there arises a problem that the fitting is not smoothly performed.

FIG. 11 is a diagram showing an example of fitting performed after performing the erroneous mounting procedure of FIG. 10. 11 (A) shows the mold opening following FIG. 10 (C), FIG. 11 (B) shows the mold rotation following FIG. 11 (A), and FIG. 11 (C) shows the mold closing following FIG. 11 (B). show.

First, as shown in FIG. 11 (A), mold opening is performed. Next, as shown in FIG. 11B, mold rotation is performed, and the rotation angle of the turntable 520 is changed from the first rotation angle to the second rotation angle. As a result, the first movable mold 820A and the second fixed mold 810B face each other, and the second movable mold 820B and the first fixed mold 810A face each other. Next, as shown in FIG. 11C, mold closing is performed.

In FIG. 11C, both the first movable mold 820A and the second fixed mold 810B are already fixed, and the guide pins 821A and the second fixed mold of the first movable mold 820A are fixed before fitting. The core of the mold 810B is misaligned with the guide hole 811B. In this case, a large movement resistance is generated at the time of fitting. Movement resistance occurs not only when the mold is closed but also when the mold is opened.

Further, in FIG. 11C, both the first fixed mold 810A and the second movable mold 820B are already fixed, and the guide pins 821B and the first of the second movable mold 820B are fixed before fitting. The center of the fixed mold 810A is misaligned with the guide hole 811A. In this case, a large movement resistance is generated at the time of fitting. Movement resistance occurs not only when the mold is closed but also when the mold is opened.

As described above, if the wrong mounting procedure is carried out, the movement resistance of mold closing or mold opening is large. The problem of large movement resistance can also occur when a mold for ordinary molding other than for two-color molding is mistakenly attached. In normal molding, the turntable 520 is not used, and the same combination of molds is always fitted. Since a normal mold for molding is not manufactured on the assumption that it is fitted with a mold of another combination, the above problem may occur when it is used as a mold for two-color molding or the like.

If a large movement resistance is generated due to an abnormality in mounting the mold, the mold device 800 or the mold clamping device 100 may be damaged, so that the injection molding machine 10 is abnormally stopped. In this case, the user of the injection molding machine 10 has conventionally called a maintenance company without noticing the mounting abnormality of the mold.

According to this embodiment, as will be described in detail later, the injection molding machine 10 determines a mold mounting abnormality when the combination of molds fitted to each other changes due to the rotation of the turntable 520. The degree of mounting abnormality (light weight) may be determined step by step. By determining the mold mounting abnormality, the convenience of both the user of the injection molding machine 10 and the maintenance company can be improved.

FIG. 12 is a diagram showing an example of a component of a control device in a functional block. Each functional block shown in FIG. 12 is conceptual and does not necessarily have to be physically configured as shown. All or part of each functional block can be functionally or physically distributed / integrated in any unit. Each processing function performed in each function block may be realized by a program executed by a CPU, or as hardware by wired logic, in whole or in an arbitrary part thereof.

The control device 700 has a detection unit 711 for detecting the movement resistance of mold closing or mold opening. The movement resistance includes, for example, at least one selected from the driving force of the moving mechanism 102, the deviation of the rotation angle of the rotating disk 520, and the driving force of the rotating mechanism 530.

The driving force of the moving mechanism 102 moves the molds 820A and 820B, and thus represents a moving resistance. The driving force of the moving mechanism 102 is, for example, the torque of the mold clamping motor 160, and is detected by a torque detector or the like. The torque of the mold clamping motor 160 can be converted and detected from the command value of the supply current of the mold clamping motor 160. The drive source of the moving mechanism 102 is not limited to the mold clamping motor 160, and may be, for example, a hydraulic cylinder. In this case, the driving force of the moving mechanism 102 may be the hydraulic pressure of the hydraulic cylinder.

The deviation of the rotation angle of the turntable 520 is a deviation from the first rotation angle or a deviation from the second rotation angle. The magnitude of the deviation of the rotation angle of the turntable 520 represents the magnitude of the misalignment before fitting, and represents the magnitude of the movement resistance at the time of fitting. The deviation of the rotation angle of the turntable 520 is detected by, for example, an encoder of the rotation motor 531.

The driving force of the rotating mechanism 530 is a force for rotating the rotating disk 520 so as to return to the target rotation angle when the rotation angle of the rotating disk 520 deviates from the target first rotation angle or the second rotation angle. Represents movement resistance. The driving force of the rotation mechanism 530 is, for example, the torque of the rotation motor 531 and is detected by a torque detector or the like. The torque of the rotary motor 531 can also be converted and detected from the command value of the supply current of the rotary motor 531.

The control device 700 has a determination unit 712 for determining an attachment abnormality of the molds 810A, 810B, 820A, and 820B based on the movement resistance detected by the detection unit 711. The determination unit 712 determines, for example, the presence or absence of an attachment abnormality. If there is a mounting abnormality, the determination unit 712 may determine the degree of the mounting abnormality step by step. Mounting anomalies include performing the wrong mounting procedure and mounting the wrong mold.

For example, as shown in FIG. 10, when an erroneous mounting procedure is carried out, the movement resistance is small at the first rotation angle, whereas the movement resistance is large at the second rotation angle. This is because the mounting positions of all the molds 810A, 810B, 820A, and 820B are determined in a state where the rotation angle of the turntable 520 is fixed to the first rotation angle.

As an erroneous mounting procedure, it is conceivable that the mounting positions of all the molds 810A, 810B, 820A, and 820B are determined with the rotation angle of the turntable 520 fixed to the second rotation angle. In this case, the movement resistance is small at the second rotation angle, whereas the movement resistance is large at the first rotation angle.

The same applies when the wrong mold is attached. Since the fixed mold and the movable mold are fitted to each other at either the first rotation angle or the second rotation angle, the movement resistance is small. On the other hand, at the other of the first rotation angle and the second rotation angle, the fixed mold and the movable mold, which are not assumed at the time of manufacturing, are fitted to each other, so that the movement resistance is large.

As described above, when there is an abnormality in mounting the mold, the movement resistance is large only in either the first rotation angle or the second rotation angle. If the movement resistance is small at both the first rotation angle and the second rotation angle, it is considered that there is no mold mounting abnormality. Further, when the movement resistance is large at both the first rotation angle and the second rotation angle, it is considered that an abnormality other than the mold mounting abnormality has occurred.

Therefore, in the determination unit 712, for example, when the movement resistance at the first rotation angle is equal to or less than the upper limit value and the movement resistance at the second rotation angle exceeds the upper limit value, or the movement resistance at the first rotation angle is increased. When the upper limit value is exceeded and the movement resistance at the second rotation angle is equal to or less than the upper limit value, it is determined that there is a mounting abnormality. The upper limit value is determined according to the processing accuracy of the mold, the moving speed of the mold (for example, the closing speed of the mold), and the like. The upper limit value may be the same value or different values for the first rotation angle and the second rotation angle. A plurality of upper limit values may be set stepwise for the purpose of determining the degree of mounting abnormality stepwise.

On the other hand, the determination unit 712 determines that there is no mounting abnormality when the movement resistance at the first rotation angle is equal to or less than the upper limit value and the movement resistance at the second rotation angle is equal to or less than the upper limit value. Further, the determination unit 712 determines that an abnormality different from the mounting abnormality has occurred when the movement resistance at the first rotation angle exceeds the upper limit value and the movement resistance at the second rotation angle exceeds the upper limit value. You may. This is because it is not expected that a large movement resistance will occur at both the first rotation angle and the second rotation angle when a mounting abnormality occurs.

Further, the determination unit 712 may determine that there is an attachment abnormality when the magnitude of the difference between the movement resistance at the first rotation angle and the movement resistance at the second rotation angle exceeds the upper limit value. This upper limit value is also determined according to the processing accuracy of the mold and the like. When a mounting abnormality occurs, a large movement resistance is generated in only one of the first rotation angle and the second rotation angle, so that the magnitude of the difference exceeds the upper limit value. On the other hand, even if the determination unit 712 determines that there is no mounting abnormality when the magnitude of the difference between the movement resistance at the first rotation angle and the movement resistance at the second rotation angle is equal to or less than the upper limit value. good.

The control device 700 may have a notification unit 713 that notifies the determination result of the determination unit 712. The notification unit 713 controls, for example, the display device 760 and displays the determination result of the determination unit 712 on the display screen. The convenience of the user of the injection molding machine 10 can be further improved. When the determination unit 712 determines that there is an attachment abnormality, the notification unit 713 may control an alarm device such as a warning light or a buzzer to output an alarm. It is possible to draw the attention of the user of the injection molding machine 10.

The control device 700 may have a prohibition unit 714 that prohibits continuous operation of repeatedly opening and closing the mold when the determination unit 712 determines that there is an attachment abnormality. The large movement resistance prevents the mold device 800 or the mold clamping device 100 from being damaged. The prohibition unit 714 permits continuous operation in which the mold is repeatedly opened and closed when the determination unit 712 determines that there is no mounting abnormality.

FIG. 13 is a flowchart showing an example of processing of the control device. The process shown in FIG. 13 is performed under the control of the control device 700 after the installation work of all the molds 810A, 810B, 820A, and 820B is completed.

First, in step S101, the control device 700 controls the moving mechanism 102 while controlling the rotating mechanism 530 so that the rotation angle of the rotating disk 520 becomes the first rotation angle, and closes the mold. The control device 700 controls the moving mechanism 102 so that the mold closing speed becomes the set speed.

Next, in step S102, the control device 700 detects the mold-closed moving resistor R1. If the movement resistance R1 of the mold closing is detected, it is possible to determine whether or not there is a mounting abnormality, so that it is not necessary to carry out the mold clamping following the mold closing.

Next, in step S103, the control device 700 controls the moving mechanism 102 while controlling the rotating mechanism 530 so that the rotation angle of the rotating disk 520 becomes the first rotation angle to perform mold opening. The control device 700 controls the moving mechanism 102 so that the mold opening speed becomes the set speed.

Next, in step S104, the control device 700 controls the rotation mechanism 530 so that the rotation angle of the turntable 520 changes from the first rotation angle to the second rotation angle, and performs mold rotation.

Next, in step S105, the control device 700 controls the moving mechanism 102 while controlling the rotating mechanism 530 so that the rotation angle of the rotating disk 520 becomes the second rotation angle, and closes the mold. The control device 700 controls the moving mechanism 102 so that the mold closing speed becomes the set speed.

Next, in step S106, the control device 700 detects the mold-closed moving resistor R2. If the movement resistance R2 of the mold closing is detected, it is possible to determine whether or not there is a mounting abnormality, so that it is not necessary to carry out the mold clamping following the mold closing.

Next, in step S107, the control device 700 controls the moving mechanism 102 while controlling the rotating mechanism 530 so that the rotation angle of the rotating disk 520 becomes the first rotation angle to perform mold opening. The control device 700 controls the moving mechanism 102 so that the mold opening speed becomes the set speed.

Next, in step S108, the control device 700 checks whether or not the moving resistance R1 is equal to or less than the upper limit value R1max. When the moving resistor R1 is equal to or less than the upper limit value R1max (step S108, YES), the control device 700 performs step S109.

In step S109, the control device 700 checks whether or not the moving resistance R2 is equal to or less than the upper limit value R2max. When the moving resistor R2 is equal to or less than the upper limit value R2max (step S109, YES), the control device 700 performs step S110.

In step S110, the control device 700 determines that there is no mounting abnormality of the molds 810A, 810B, 820A, and 820B. Next, in step S111, the control device 700 permits continuous operation in which the mold is repeatedly opened and closed. Finally, in step S112, the control device 700 notifies the determination result of the mounting abnormality. The order of step S112 and step S111 may be reversed.

On the other hand, when the moving resistor R1 exceeds the upper limit value R1max (step S108, NO), the control device 700 executes step S113. In step S113, it is checked whether or not the moving resistance R2 is equal to or less than the upper limit value R2max. When the moving resistor R2 is equal to or less than the upper limit value R2max (step S113, YES), the control device 700 performs step S114. Step S114 is also performed when the movement resistance R1 is equal to or less than the upper limit value R1max (step S108, YES) and when the movement resistance R2 exceeds the upper limit value R2max (step S109, NO).

In step S114, the control device 700 determines that there is a mounting abnormality of the molds 810A, 810B, 820A, and 820B. Next, in step S115, the control device 700 prohibits continuous operation in which the mold is repeatedly opened and closed. Finally, in step S112, the control device 700 notifies the determination result of the mounting abnormality. The order of step S112 and step S115 may be reversed.

Further, when the moving resistor R1 exceeds the upper limit value R1max (step S108, NO) and the moving resistor R2 exceeds the upper limit value R2max (step S113, NO), the control device 700 executes step S116.

In step S116, the control device 700 determines that there is an abnormality other than the mounting abnormality. Next, in step S117, the control device 700 prohibits continuous operation in which the mold is repeatedly opened and closed. Finally, in step S112, the control device 700 notifies that there is an abnormality other than the mounting abnormality. The order of step S112 and step S117 may be reversed.

When the two upper limit values R1max and R2max are the same value, the two moving resistors R1 and R2 are measured at the same mold opening speed. This is because the moving resistors R1 and R2 depend not only on the magnitude of misalignment before fitting but also on the mold opening speed.

FIG. 14 is a flowchart showing another example of the processing of the control device. The control device 700 may carry out step S108A shown in FIG. 14 instead of steps S108, S109 and S113 shown in FIG. In step S108A, the control device 700 checks whether the magnitude ΔR (ΔR = | R1-R2 |) of the difference between the moving resistance R1 and the moving resistance R2 is equal to or less than the upper limit value ΔRmax.

ΔR is the difference between the two moving resistors R1 and R2 measured at the same mold opening speed. This is because the moving resistors R1 and R2 depend not only on the magnitude of misalignment before fitting but also on the mold opening speed. A plurality of upper limit values ΔRmax may be set stepwise for the purpose of determining the degree of mounting abnormality stepwise.

When ΔR is ΔRmax or less (step S108A, YES), the control device 700 performs step S110. On the other hand, when ΔR exceeds ΔRmax (step S108A, NO), the control device 700 performs step S114.

In addition, in FIGS. 13 and 14, the two moving resistors R1 and R2 are both measured when the mold is closed, but both may be measured when the mold is opened. In the latter case, the two moving resistors R1 and R2 may be measured at the same mold opening speed.

Further, in FIGS. 13 and 14, both the moving resistance R1 at the first rotation angle and the moving resistance R2 at the second rotation angle are detected, but either one may be simply detected. In that case, the determination unit 712 determines whether or not there is an attachment abnormality based on whether or not the detected moving resistance exceeds the upper limit value.

Further, both steps S108, S109 and S113 shown in FIG. 13 and steps S108A shown in FIG. 14 may be carried out. For example, when either (A) or (B) below is satisfied and (C) below is satisfied, it is determined that there is a serious mounting abnormality. Further, when only one of the following (A), (B), and (C) is satisfied, it is determined that there is a slight mounting abnormality. (A) The moving resistance R1 is equal to or less than the upper limit value R1max, and the moving resistance R2 exceeds the upper limit value R2max. (B) The moving resistance R1 exceeds the upper limit value R1max, and the moving resistance R2 is equal to or lower than the upper limit value R2max. (C) ΔR exceeds ΔRmax.

Although the embodiment of the injection molding machine according to the present invention has been described above, the present invention is not limited to the above embodiment. Within the scope of the claims, various changes, modifications, replacements, additions, deletions, and combinations are possible. Naturally, they also belong to the technical scope of the present invention.

For example, the turntable 520 of the above embodiment is attached to the movable platen 120, but may be attached to the fixed platen 110. In the latter case, the movable platen 120 corresponds to the first platen described in the claims, and the fixed platen 110 corresponds to the second platen described in the claims. The moving mechanism 102 may move the movable platen 120. When the movable platen 120 is the first platen, the moving mechanism 102 moves the first platen. On the other hand, when the movable platen 120 is the second platen, the moving mechanism 102 moves the second platen. Therefore, the moving mechanism 102 may be any one that moves the first platen and the second platen relatively in the mold opening / closing direction.

10 Injection molding machine 102 Moving mechanism 110 Fixed platen (first platen)
120 Movable Platen (2nd Platen)
520 Rotating disk 530 Rotating mechanism 810A 1st fixed mold (1st mold)
810B 2nd fixed mold (2nd mold)
820A 1st movable mold (3rd mold)
820B 2nd movable mold (4th mold)

Claims (8)

The first platen to which the first mold and the second mold are individually attached,
A turntable to which the 3rd mold and the 4th mold are individually attached,
A second platen to which the turntable is rotatably attached,
The first rotation angle at which the first mold and the third mold are fitted and the second mold and the fourth mold are fitted, and the first mold and the fourth mold are fitted. A rotation mechanism for rotating the turntable at a second rotation angle at which the second mold and the third mold are fitted together with each other.
A moving mechanism that relatively moves the first platen and the second platen in the mold opening / closing direction,
A detector that detects the movement resistance of mold closing or mold opening,
Based on the moving resistance detected by the detection unit, it has a determination unit for determining an attachment abnormality between the first mold, the second mold, the third mold, and the fourth mold. Injection molding machine. When the movement resistance at the first rotation angle is equal to or less than the upper limit value and the movement resistance at the second rotation angle exceeds the upper limit value, the determination unit determines the movement at the first rotation angle. The injection molding machine according to claim 1, wherein when the resistance exceeds the upper limit value and the moving resistance at the second rotation angle is not more than the upper limit value, it is determined that the mounting abnormality is obtained. The determination unit determines that the mounting abnormality is determined when the magnitude of the difference between the moving resistance at the first rotation angle and the moving resistance at the second rotation angle exceeds the upper limit value. The injection molding machine according to 1 or 2. The movement resistance according to any one of claims 1 to 3, wherein the movement resistance includes at least one selected from the driving force of the moving mechanism, the deviation of the rotation angle of the rotating disk, and the driving force of the rotating mechanism. The injection molding machine described. The injection molding machine according to claim 4, wherein the driving force of the moving mechanism is the torque of a motor that is a driving source of the moving mechanism. The injection molding machine according to claim 4 or 5, wherein the driving force of the rotating mechanism is the torque of a motor that is a driving source of the rotating mechanism. The injection molding machine according to any one of claims 1 to 6, further comprising a notification unit that notifies the determination result of the determination unit. The injection molding machine according to any one of claims 1 to 7, further comprising a prohibiting unit that prohibits continuous operation in which the mold is repeatedly opened and closed when the determination unit determines that the mounting abnormality has occurred.

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