Injection molding machine

Abstract

To provide a technique that can properly adjust the respective mold clamping forces of multiple molds.SOLUTION: An injection molding machine includes: a movable platen with a plurality of mutually independent movable molds; a fixed platen with a plurality of fixed molds capable of facing the plurality of movable molds, respectively; and a moving mechanism for moving the movable platen in a mold open / close direction relative to the fixed platen. The movable platen or the fixed platen has: a mold clamping force suppression portion for making the mold clamping force of some of the plurality of movable molds and the plurality of fixed molds smaller than that of other molds at the time of mold clamping of the plurality of movable molds and the plurality of fixed molds; and a partial mold clamping force adjustment portion for adjusting the mold clamping force of some molds at the time of injection molding after the mold clamping of the plurality of movable molds and plurality of fixed molds.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to an injection molding machine.

Background Art

[0002] Patent Document 1 discloses an injection molding machine provided with a mold clamping device for simultaneously clamping a plurality of different molds. This injection molding machine includes a primary mold for performing primary molding, a secondary mold for performing secondary molding, and a pair of mold clamping actuators corresponding to each mold. In injection molding, the injection molding machine simultaneously clamps each mold by each mold clamping actuator, and after first performing primary molding with the primary mold, each movable mold is inverted and secondary molding is performed with the secondary mold to mold a molded product.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In this type of injection molding machine, the mold clamping force applied to the mold during mold clamping varies depending on the shape of the molded product and the filling material. If the mold clamping force is less than the appropriate value, the mold opens and burrs are generated. For this reason, conventionally, the mold clamping force has been set according to the mold that requires a high mold clamping force among the two molds, and the two molds have been clamped with the same mold clamping force.

[0005] However, if the mold clamping force is applied to the mold that requires a small mold clamping force more than necessary, inconveniences such as the air vent being crushed and the gas escape deteriorating, the load on the mold increasing and the life of the mold being easily reduced occur.

[0006] The present disclosure provides a technique capable of appropriately adjusting the mold clamping force of each of a plurality of molds.

Means for Solving the Problems

[0007] According to one aspect of the present disclosure, an injection molding machine includes a movable platen having a plurality of movable molds independent of each other, a fixed platen having a plurality of fixed molds capable of facing each of the plurality of movable molds, and a moving mechanism for relatively moving the movable platen in the mold opening and closing direction with respect to the fixed platen, wherein the movable platen or the fixed platen has a mold clamping force suppression portion for making the mold clamping force of some of the plurality of movable molds and the plurality of fixed molds smaller than the mold clamping force of the other molds when the plurality of movable molds and the plurality of fixed molds are clamped, and a partial mold clamping force adjustment portion for adjusting the mold clamping force of the some molds during injection molding after the plurality of movable molds and the plurality of fixed molds are clamped.

Advantages of the Invention

[0008] According to one aspect, the mold clamping force of each of the plurality of molds can be appropriately adjusted.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the drawings. In each drawing, the same reference numerals are assigned to the same components, and duplicate explanations may be omitted.

[0011] FIG. 1 is a view showing the state of an injection molding machine at the completion of mold opening according to an embodiment. FIG. 2 is a view showing the state of the injection molding machine at the time of mold clamping according to an embodiment. FIG. 3 is a horizontal sectional view showing a state in which the fixed mold and the movable mold of the mold device are separated when the rotation angle of the turntable is the first rotation angle. FIG. 4 is a horizontal sectional view showing the state of the mold device at the time of mold clamping when the rotation angle of the turntable is the first rotation angle. FIG. 5 is a horizontal sectional view showing the state of the mold device at the completion of mold opening when the rotation angle of the turntable is the first rotation angle. FIG. 6 is a horizontal sectional view showing the state of the mold device at the time of mold clamping when the rotation angle of the turntable is the second rotation angle. FIG. 7 is a horizontal sectional view showing the state of the mold device at the completion of mold opening when the rotation angle of the turntable is the second rotation angle. Note that FIGS. 1 and 2 are vertical sectional views taken along line I-I of FIG. 4.

[0012] In the description of the embodiments, directions or positions may be indicated according to the three-dimensional arrows shown in FIGS. 1 to 7. The X-axis direction, Y-axis direction, and Z-axis direction are perpendicular to each other. The X-axis direction and 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 mold, 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 operation side, and the positive side in the Y-axis direction is called the non-operation side.

[0013] As shown in FIGS. 1 to 7, the injection molding machine 10 includes a mold clamping device 100 that opens and closes a mold device 800, a first ejector device 201 that ejects a first unnecessary product 23 formed by the mold device 800, a second ejector device 202 that ejects both a second molded product 22 and a second unnecessary product 24 formed by the mold device 800, a first injection device 301 that injects a molding material into the mold device 800, a second injection device 302 that injects a molding material into the mold device 800, a first moving device 401 that moves the first injection device 301 forward and backward with respect to the mold device 800, a second moving device (not shown) that moves the second injection device 302 forward and backward with respect to the mold device 800, 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.

[0014] 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 each installed on the floor 2 via a leveling adjuster 930. The control device 700 is disposed in the internal space of the injection device frame 920. Hereinafter, each component of the injection molding machine 10 will be described.

[0015] (Mold Clamping Device) In the description of the mold clamping device 100, the moving direction of the movable platen 120 at the time of mold closing (for example, the positive X-axis direction) is defined as the front, and the moving direction of the movable platen 120 at the time of mold opening (for example, the negative X-axis direction) is defined as the rear for explanation. The mold clamping device 100 performs mold closing, pressure boosting, mold clamping, pressure release, and mold opening of the mold device 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.

[0016] The mold clamping device 100 is, for example, horizontal, and the mold opening and closing direction is horizontal. The mold clamping device 100 includes a fixed platen 110 to which a first fixed mold 810A and a second fixed mold 810B are attached, a rotating disk 520 to which a first movable mold 820A and a second movable mold 820B are attached, a movable platen 120 to which the rotating disk 520 is rotatably attached, a rotating mechanism 530 for rotating the rotating disk 520, and a moving mechanism 102 for moving the movable platen 120 forward and backward with respect to the fixed platen 110.

[0017] The fixed platen 110 is fixed to the mold clamping device frame 910. A first fixed mold 810A and a second fixed mold 810B are attached to the opposing surface of the fixed platen 110 with respect to the movable platen 120.

[0018] The first fixed mold 810A has a plurality of plates 871A laminated in the mold opening and closing direction. The second fixed mold 810B also has a plurality of plates 871B laminated in the mold opening and closing direction. The plate 871A in the negative X-axis direction of the first fixed mold 810A forms a part of the wall surface of the first cavity space 801 where the first molded product 21 is molded. On the other hand, the plate 871B in the negative X-axis direction of the second fixed mold 810B forms a part of the wall surface of the second cavity space 802 where the second molded product 22 including the first molded product 21 is molded.

[0019] The plate 871A in the negative X-axis direction of the first fixed mold 810A and the plate 871B in the negative X-axis direction of the second fixed mold 810B are formed in, for example, mutually different concave shapes. In FIGS. 3 to 7, for ease of understanding of the drawings, the first fixed mold 810A and the second fixed mold 810B are illustrated in a form having one concave portion 801a, 802a. However, the first fixed mold 810A may have a plurality of concave portions to form a plurality of first cavity spaces 801. Similarly, the second fixed mold 810B may have a plurality of concave portions 802a (see FIG. 8) to form a plurality of second cavity spaces 802.

[0020] Further, the fixed platen 110 has one or more pillars 191 on the opposing surface to the movable platen 120. The pillar 191 functions as a clamping force suppressing portion 190 that makes the clamping force on the side of the second fixed die 810B (a part of the plurality of fixed dies) smaller than the clamping force of the first fixed die 810A (the other fixed die of the plurality of fixed dies). The configuration of this clamping force suppressing portion 190 will be described in detail later.

[0021] The movable platen 120 is disposed movably in the mold opening and 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 opposing surface of the movable platen 120 to the fixed platen 110. As shown in FIGS. 3 to 7, the movable platen 120 rotatably supports the rotation shaft 571 of the turntable 520 via a bearing 572.

[0022] 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 and closing direction. A first movable die 820A and a second movable die 820B are attached to the opposing surface of the turntable 520 to the fixed platen 110.

[0023] The first movable die 820A and the second movable die 820B form, in order, 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, as shown in FIGS. 4 and 6. The first movable die 820A and the second movable die 820B are formed, for example, in the same convex shape. The first movable die 820A has a plurality of plates 831A, 835A, 836A laminated in the mold opening and closing direction. The second movable die 820B also has a plurality of plates 831B, 835B, 836B laminated in the mold opening and closing direction. The plates 831A, 831B attached to the movable platen 120 are referred to as movable mounting plates 831A, 831B. The plates 836A, 836B forming the cavity space are referred to as movable die plates 836A, 836B. The plates 835A, 835B disposed between the movable mounting plates 831A, 831B and the movable die plates 836A, 836B are referred to as spacer blocks 835A, 835B.

[0024] In one 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. However, 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.

[0025] The turntable 520 rotates around the rotation center line 520X by a rotation mechanism 530. The rotation mechanism 530 has a rotation motor and a transmission mechanism (not shown), and rotates the turntable 520 to a first rotation angle and a second rotation angle. The first rotation angle is, for example, as shown in FIG. 4, the rotation angle at which the first fixed mold 810A and the first movable mold 820A are fitted together, and the second fixed mold 810B and the second movable mold 820B are fitted together. The first rotation angle is, for example, 0°. On the other hand, the second rotation angle is, as shown in FIG. 6, the rotation angle at which the first fixed mold 810A and the second movable mold 820B are fitted together, and the second fixed mold 810B and the first movable mold 820A are fitted together. The second rotation angle is, for example, 180°.

[0026] Each time the turntable 520 is rotated by 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 piping fixed to the turntable 520 returns to its original state, the handling of the wiring and piping is easy.

[0027] As shown in FIG. 4, at the first rotation angle, 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 form the second cavity space 802. The molding material is supplied from the first injection device 301 to the first cavity space 801, and the first molded product 21 is molded. Subsequently, mold opening is performed.

[0028] Next, as shown in FIG. 5, the first ejector device 201 ejects the first unnecessary part 23 from the first movable mold 820A. The first unnecessary part 23, together with the first molded product 21, is solidified inside the mold device 800. Next, the rotating mechanism 530 rotates the turntable 520 by 180°. Along with the rotation of the turntable 520, the first movable mold 820A and the second movable mold 820B rotate by 180°. At this time, the first molded product 21 rotates by 180° together with the first movable mold 820A without being ejected from the first movable mold 820A.

[0029] Then, as shown in FIG. 6, at the second rotation angle, 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 the second cavity space 802. As described above, a part of the first molded product 21 is disposed in the second cavity space 802. The remaining part of the second cavity space 802 is supplied with a molding material from the second injection device 302, and the second molded product 22 is molded. The second molded product 22 is a two-material molded product including the first molded product 21. Parallel to the molding of the second molded product 22, the first molded product 21 is molded. The first molded product 21 is molded in the first cavity space 801. Subsequently, mold opening is performed.

[0030] Next, as shown in FIG. 7, the second ejector device 202 ejects both the second molded product 22 and the second unnecessary part 24 from the first movable mold 820A. The second unnecessary part 24, together with the second molded product 22, is solidified inside the mold device 800. After the second unnecessary part 24 is ejected from the first movable mold 820A, it is separated from the second molded product 22. Parallel to the ejection of both the second molded product 22 and the second unnecessary part 24, the first unnecessary part 23 is ejected. Thereafter, mold opening is performed, and again, the turntable 520 rotates by 180°.

[0031] The movable platen 120 mainly includes, as shown in FIG. 4, a front panel 121 that rotatably supports a rotating disk 520, an intermediate block 124 disposed radially inside the cylindrical portion 524 of the rotating disk 520, a rear block 126 provided behind the intermediate block 124, and a toggle link attachment portion 128 (see FIG. 1) provided on the rear end surface of the rear block 126. The front panel 121, the intermediate block 124, the rear block 126, and the toggle link attachment portion 128 may be separately formed and connected, or may be integrally formed by casting or the like.

[0032] The front panel 121 rotatably supports the rotating disk 520. A first rod hole 122 penetrating the front panel 121 in the mold opening and closing direction is formed in the front panel 121. A first ejector rod 211 is disposed in the first rod hole 122 so as to be able to advance and retract. Further, a second rod hole 123 penetrating the front panel 121 in the mold opening and closing direction is formed in the front panel 121. A second ejector rod 212 is disposed in the second rod hole 123 so as to be able to advance and retract.

[0033] The intermediate block 124 is disposed radially inside the cylindrical portion 524 of the rotating disk 520. The intermediate block 124 has, for example, a columnar shape that fits inside the cylindrical portion 524 of the rotating disk 520 when viewed in the mold opening and closing direction. Inside the intermediate block 124, a space for disposing the first ejector device 201 and a space for disposing the second ejector device 202 are formed. The front panel 121 is attached to the front end surface of the intermediate block 124. An insertion hole 127 through which the rotating shaft 571 of the rotating disk 520 is inserted via a bearing 572 is formed in the front panel 121 and the intermediate block 124.

[0034] The rear block 126 is provided behind the intermediate block 124 and is supported by a 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 for disposing the first ejector device 201 and a space for disposing the second ejector device 202 are formed. The intermediate block 124 is attached to the front end surface of the rear block 126.

[0035] The toggle link attachment parts 128 (see FIGS. 1 and 2) are provided in a pair vertically on the rear end surface of the rear block 126. Each toggle link attachment part 128 is plate-shaped with the plate thickness direction facing the horizontal direction, protrudes rearward from the rear end surface of the rear block 126, and has a pin hole (not shown) at its tip. A pin is inserted through the pin hole, and the first link 152 (see FIGS. 1 and 2) is swingably attached to the toggle link attachment part 128 via the pin.

[0036] As shown in FIGS. 1 and 2, the moving mechanism 102 performs mold closing, pressure boosting, mold clamping, pressure release, and mold opening of the mold device 800 by relatively moving the movable platen 120 in the mold opening and closing direction with respect to the fixed platen 110. The moving mechanism 102 includes a toggle support 130 disposed at a distance from the fixed platen 110, a tie bar 140 connecting the fixed platen 110 and the toggle support 130, a toggle mechanism 150 that moves the movable platen 120 in the mold opening and closing direction with respect to the toggle support 130, a mold clamping motor 160 that operates the toggle mechanism 150, a motion conversion mechanism 170 that converts the rotational motion of the mold clamping motor 160 into a linear motion, and a mold thickness adjustment mechanism 180 that adjusts the distance between the fixed platen 110 and the toggle support 130.

[0037] The toggle support 130 is disposed at a distance from the fixed platen 110 and is placed movably in the mold opening and closing direction on the mold clamping device frame 910. Note that 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 common with the guide 101 of the movable platen 120.

[0038] In this embodiment, the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle support 130 is disposed movably in the mold opening and closing direction with respect to the mold clamping device frame 910. However, the toggle support 130 may be fixed to the mold clamping device frame 910, and the fixed platen 110 may be disposed movably in the mold opening and closing direction with respect to the mold clamping device frame 910.

[0039] The tie bar 140 connects the fixed platen 110 and the toggle support 130 with a space L therebetween in the mold opening / closing direction. A plurality of (for example, four) tie bars 140 may be used. The plurality of tie bars 140 are arranged in parallel in the mold opening / closing direction and extend according to the clamping force. At least one tie bar 140 may be provided with a tie bar strain detector 141 for detecting the strain of the tie bar 140. The tie bar strain detector 141 sends a signal indicating its detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detecting the clamping force and the like.

[0040] In this embodiment, the tie bar strain detector 141 is used as the clamping force detector for detecting the clamping force, but it is not limited thereto. The 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, etc., and its mounting position is not limited to the tie bar 140 either.

[0041] The toggle mechanism 150 is disposed between the movable platen 120 and the toggle support 130, and moves the movable platen 120 in the mold opening / closing direction with respect to the toggle support 130. The toggle mechanism 150 has a crosshead 151 that moves in the mold opening / closing direction and a pair of link groups that flex by the movement of the crosshead 151. Each of the pair of link groups 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 by a pin or the like. The second link 153 is swingably attached to the toggle support 130 by a pin or the like. The second link 153 is attached to the crosshead 151 via a third link 154. When the crosshead 151 is advanced and retracted with respect to the toggle support 130, the first link 152 and the second link 153 flex, and the movable platen 120 advances and retracts with respect to the toggle support 130.

[0042] Note that the configuration of the toggle mechanism 150 is not limited to the configuration shown in FIGS. 1 and 2. For example, in FIGS. 1 and 2, the number of nodes of each link group is five, but it may be four, and one end of the third link 154 may be coupled to the node between the first link 152 and the second link 153.

[0043] The clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150. The clamping motor 160 moves the crosshead 151 forward and backward with respect to the toggle support 130, thereby flexing and extending the first link 152 and the second link 153, and moving the movable platen 120 forward and backward with respect to the toggle support 130. The 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, pulley, or the like.

[0044] The motion conversion mechanism 170 converts the rotational motion of the clamping motor 160 into the linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut that engages with the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

[0045] The clamping device 100 performs a mold closing process, a pressure boosting process, a clamping process, a pressure releasing process, a mold opening process, a mold rotation process, etc. under the control of the control device 700. The mold rotation process is performed after the completion of the mold opening process and before the start of the next mold closing process. In this embodiment, the mold rotation process is performed after the completion of the protruding process, but may be performed before the completion of the protruding process. For example, when the position where the second molded product 22 is molded is different from the position where the second molded product 22 is protruded, after the completion of the mold opening process, the mold rotation process is performed, and then the protruding process is performed. For example, when the position where the second molded product 22 is molded is on the operation side and the position where the second molded product 22 is protruded is on the non-operation side, after the completion of the mold opening process, the mold rotation process is performed, and then the protruding process is performed.

[0046] In the mold closing process, the clamping motor 160 is driven to move the crosshead 151 forward to the mold closing completion position at a set moving speed, thereby moving the movable platen 120 forward and touching the movable mold 820 against the fixed mold 810. The position and moving speed of the crosshead 151 are detected using, for example, a clamping motor encoder 161 or the like. The clamping motor encoder 161 detects the rotation of the clamping motor 160 and sends a signal indicating the detection result to the control device 700.

[0047] Note that 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 clamping motor encoder 161, and general ones can be used. Also, the movable platen position detector for detecting the position of the movable platen 120 and the movable platen moving speed detector for detecting the moving speed of the movable platen 120 are not limited to the clamping motor encoder 161, and general ones can be used.

[0048] In the pressure boosting process, the clamping motor 160 is further driven to move the crosshead 151 further forward from the mold closing completion position to the clamping position to generate a clamping force.

[0049] In the clamping process, the clamping motor 160 is driven to maintain the position of the crosshead 151 at the clamping position. In the clamping process, the clamping force generated in the pressure boosting process is maintained. In the clamping process, a first cavity space 801 and a second cavity space 802 are formed in the mold device 800.

[0050] In the pressure release process, the clamping motor 160 is driven to move the crosshead 151 backward from the clamping position to the mold opening start position, thereby moving the movable platen 120 backward and reducing the clamping force. The mold opening start position and the mold closing completion position may be the same position.

[0051] In the mold opening process, the clamping motor 160 is driven to move the crosshead 151 backward from the mold opening start position to the mold opening completion position at a set moving speed, thereby moving the movable platen 120 backward and separating the movable mold 820 from the fixed mold 810.

[0052] After the completion of the mold opening process and before the start of the next mold closing process, the ejection process is performed. In the ejection process, the first ejector device 201 ejects the first non-required part 23 from the movable mold 820. The first molded product 21 solidified together with the first non-required part 23 is not ejected. Also, in the ejection process, the second ejector device 202 ejects both the second molded product 22 and the second non-required part 24 from the movable mold 820. After the completion of the ejection process and before the start of the next mold closing process, the mold rotation process is performed.

[0053] In the mold rotation process, the turntable 520 is rotated to rotate the first molded product 21 together with the movable mold 820. Then, by performing the mold closing process and the pressure boosting process, the first molded product 21 is arranged in a part of the second cavity space 802.

[0054] The setting conditions in the mold closing process, the pressure boosting process, and the mold clamping process are set together as a series of setting conditions. For example, the moving speed and position of the crosshead 151 in the mold closing process and the pressure boosting process (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 are set together as a series of setting conditions. The mold closing start position, the moving speed switching position, the mold closing completion position, and the mold clamping position are arranged in this order from the rear to the front, and represent the start point and the end point of the section where the moving speed is set. The moving speed is set for each section. The moving speed switching position may be one or more. The moving speed switching position may not be set. Either only the mold clamping position or only the mold clamping force may be set.

[0055] The setting conditions in the pressure release process and the mold opening process are also set in the same way. For example, the moving speed and position of the crosshead 151 (mold opening start position, moving speed switching position, and mold opening completion position) in the pressure release process and the mold opening process are set together as a series of setting conditions. The mold opening start position, moving speed switching position, and mold opening completion position are arranged in this order from the front to the rear, and represent the start and end points of the section where the moving speed is set. The moving speed is set for each section. The moving speed switching position may be one or more. The moving speed switching position may not be set. The mold opening start position and the mold closing completion position may be the same position. Also, the mold opening completion position and the mold closing start position may be the same position.

[0056] Note that instead of the moving speed and position of the crosshead 151, etc., the moving speed and position of the movable platen 120, etc. may be set. Also, instead of the position of the crosshead (e.g., mold clamping position) and the position of the movable platen, the mold clamping force may be set.

[0057] The toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. The amplification ratio is also called the toggle ratio. The toggle ratio changes according to the angle θ formed by the first link 152 and the second link 153 (hereinafter also referred to as "link angle θ"). The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180°, the toggle ratio is maximized.

[0058] When the thickness of the mold device 800 changes due to the replacement of the mold device 800 or the temperature change of the mold device 800, etc., mold thickness adjustment is performed so that a predetermined mold clamping force can be obtained during mold clamping. In the mold thickness adjustment, for example, the interval L between the fixed platen 110 and the toggle support 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time of mold touch when the movable mold 820 touches the fixed mold 810.

[0059] The mold clamping device 100 has a mold thickness adjustment mechanism 180. The mold thickness adjustment mechanism 180 adjusts the mold thickness by adjusting the distance L between the fixed platen 110 and the toggle support 130. Note that the timing of the mold thickness adjustment is performed, for example, between the end of the molding cycle and the start of the next molding cycle. The mold thickness adjustment mechanism 180 has, for example, a screw shaft 181 formed at the rear end of the tie bar 140, a screw nut 182 rotatably and non-axially held by the toggle support 130, and a mold thickness adjustment motor 183 that rotates the screw nut 182 screwed onto the screw shaft 181.

[0060] The screw shaft 181 and the screw nut 182 are provided for each tie bar 140. The rotational driving force of the mold thickness adjustment motor 183 may be transmitted to a plurality of screw nuts 182 via the rotational driving force transmission unit 185. The plurality of screw nuts 182 can be rotated synchronously. Note that by changing the transmission path of the rotational driving force transmission unit 185, it is also possible to rotate the plurality of screw nuts 182 individually.

[0061] The rotational driving force transmission unit 185 is composed of, for example, gears. In this case, driven gears are formed on the outer periphery of each screw nut 182, a driving gear is attached to the output shaft of the mold thickness adjustment motor 183, and an intermediate gear that meshes with the plurality of driven gears and the driving gear is rotatably held at the center of the toggle support 130. Note that the rotational driving force transmission unit 185 may be composed of a belt, a pulley, or the like instead of gears.

[0062] The operation of the mold thickness adjustment mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjustment motor 183 to rotate the screw nut 182. As a result, the position of the toggle support 130 relative to the tie bar 140 is adjusted, and the distance L between the fixed platen 110 and the toggle support 130 is adjusted. Note that a plurality of mold thickness adjustment mechanisms may be used in combination.

[0063] The interval L is detected using the mold thickness adjustment motor encoder 184. The mold thickness adjustment motor encoder 184 detects the amount of rotation and the direction of rotation of the mold thickness adjustment 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 of the toggle support 130 and the interval L. Note that the toggle support position detector for detecting the position of the toggle support 130 and the interval detector for detecting the interval L are not limited to the mold thickness adjustment motor encoder 184, and general ones can be used.

[0064] The mold clamping device 100 may have a mold temperature controller for adjusting the temperature of the mold device 800. The mold device 800 has a flow path for the temperature control medium inside. The mold temperature controller adjusts the temperature of the mold device 800 by adjusting the temperature of the temperature control medium supplied to the flow path of the mold device 800.

[0065] Note that the mold clamping device 100 according to the present embodiment is a horizontal type in which the mold opening / closing direction is the horizontal direction, but it may also be a vertical type in which the mold opening / closing direction is the vertical direction. Further, the mold clamping device 100 of the present embodiment has a mold clamping motor 160 as a drive unit, but it may have a hydraulic cylinder instead of the mold clamping motor 160. Alternatively, the mold clamping device 100 may have a linear motor for mold opening / closing and an electromagnet for mold clamping.

[0066] (First ejector device 201 and second ejector device 202) In the description of the first ejector device 201 and the second ejector device 202, similar to 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 X-axis direction) is defined as the front, and the moving direction of the movable platen 120 when the mold is open (for example, the negative X-axis direction) is defined as the rear for explanation.

[0067] The first ejector device 201 and the second ejector device 202 move forward and backward together with the movable platen 120. The first ejector device 201 projects the first unnecessary part 23 from the first movable mold 820A and the second movable mold 820B. At this time, the first ejector device 201 does not project the first molded product 21 solidified together with the first unnecessary part 23. The second ejector device 202 projects both the second molded product 22 and the second unnecessary part 24 from the first movable mold 820A and the second movable mold 820B.

[0068] 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 non-operation side. Thereby, the second molded product 22 can be taken out on the non-operation side.

[0069] First, the configuration of the first movable mold 820A will be mainly described with reference to FIG. 5. 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 part 23 and the second unnecessary part 24 from the fixed portion 830A, and a second movable portion 850A that projects the second molded product 22 from the fixed portion 830A.

[0070] The fixed portion 830A includes a movable mounting plate 831A attached to the turntable 520, a spacer block 835A that forms a space 834A in front of the movable mounting plate 831A, a movable mold plate 836A fixed to the movable mounting plate 831A via the spacer block 835A, and a guide pin 839A.

[0071] A through hole 832A into which the first ejector rod 211 and the second ejector rod 212 are sequentially inserted and removed is formed in the movable mounting plate 831A. 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.

[0072] The spacer block 835A forms a space 834A between the movable mounting plate 831A and the movable die plate 836A. In this space 834A, a first ejector plate 841A, which will be described later, and a second ejector plate 851A, which will be described later, are arranged so as to be able to move forward and backward.

[0073] The movable die plate 836A forms, in order, 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 on the front end surface.

[0074] The first movable part 840A includes, for example, a first ejector plate 841A arranged perpendicular to the mold opening and closing direction, a rod-shaped first ejector pin 842A extending forward from the first ejector plate 841A, and a first pressing body 843A fixed to the tip of the first ejector pin 842A.

[0075] The first ejector plate 841A is arranged in the space 834A between the movable mounting plate 831A and the movable die plate 836A. The first ejector plate 841A moves forward and backward along a guide pin 839A parallel to the mold opening and closing direction. The first ejector plate 841A is biased in a direction away from the movable die plate 836A by a first return spring 845A.

[0076] The first ejector pin 842A is arranged so as to be able to move forward and backward in a first pin hole penetrating the movable die plate 836A in the mold opening and closing direction. The first pressing body 843A is formed, for example, on an annular plate that circulates around the convex portion of the first movable mold 820A. The first pressing body 843A can push down the first unnecessary part 23 by moving forward and backward integrally with the first ejector pin 842A and contacting the first unnecessary part 23 on the front surface.

[0077] The second movable part 850A includes, for example, a second ejector plate 851A arranged perpendicular to the mold opening and closing direction, and a rod-shaped second ejector pin 852A extending forward from the second ejector plate 851A.

[0078] The second ejector plate 851A is disposed in the space 834A between the movable mounting plate 831A and the movable die plate 836A. The second ejector plate 851A advances and retracts along the guide pin 839A parallel to the mold opening and closing direction. The second ejector plate 851A is biased in a direction away from the movable die plate 836A by the second return spring 855A.

[0079] The second ejector plate 851A is disposed between the movable mounting plate 831A and the first ejector plate 841A. When the second ejector plate 851A advances and retracts, the first ejector plate 841A advances and retracts together with the second ejector plate 851A.

[0080] A through hole 856A penetrating the second ejector plate 851A in the mold opening and closing direction is formed in the second ejector plate 851A. 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.

[0081] 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.

[0082] The second ejector pin 852A is disposed so as to be able to advance and retract in a second pin hole penetrating the movable die plate 836A in the mold opening and closing direction. The front end face of the second ejector pin 852A abuts against the first molded product 21 or the second molded product 22.

[0083] The second movable mold 820B, similar to the first movable mold 820A, has a fixing part 830B fixed to the movable platen 120, a first movable part 840B protruding both the first waste 23 and the second waste 24 from the fixing part 830B, and a second movable part 850B protruding the second molded product 22 from the fixing part 830B. Since the second movable mold 820B is configured in the same way as the first movable mold 820A, the description thereof is omitted.

[0084] Next, the first ejector device 201 and the operation in which the first ejector device 201 protrudes the first waste 23 from the first movable mold 820A will be mainly described with reference to FIG. 5. Note that the first ejector device 201 not only performs the operation of protruding the first waste 23 from the first movable mold 820A, but also performs the operation of protruding the first waste 23 from the second movable mold 820B. Since the latter operation is performed in the same way as the former operation, the description thereof is omitted.

[0085] The first ejector device 201 has a first ejector rod 211 that presses only the first movable part 840A out of the first movable part 840A and the second movable part 850A. The first ejector rod 211 is not connected to the first movable part 840A. The first ejector rod 211 can be removed from the turntable 520, and the turntable 520 can be rotated.

[0086] The first ejector device 201 has a first drive mechanism 220 that moves the first ejector rod 211 forward and backward. The first drive mechanism 220 includes, for example, a first ejector motor 221, a first crosshead 223, and a first motion conversion mechanism 225 that converts the rotational motion of the first ejector motor 221 into the linear motion of the first crosshead 223.

[0087] The first motion conversion mechanism 225 includes a screw shaft and a screw nut screwed onto the screw shaft. A ball or a roller may be interposed between the screw shaft and the screw nut. The first crosshead 223 moves in the mold opening and 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 moves forward and backward together with the first crosshead 223.

[0088] When the first drive mechanism 220 advances the first ejector rod 211 as shown in FIG. 5, 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, and pushes the first ejector plate 841A forward. As a result, the first ejector plate 841A advances against the biasing force of the first return spring 845A. Therefore, the first ejector pin 842A and the first pressing body 843A advance, and the first non-conforming product 23 protrudes from the fixing portion 830A.

[0089] While the first drive mechanism 220 advances the first ejector plate 841A together with the first ejector rod 211, the second ejector plate 851A is held at the retracted limit position by the biasing force of the second return spring 855A and does not advance. Therefore, when the first non-conforming product 23 protrudes from the fixing portion 830A, the first molded product 21 does not protrude from the fixing portion 830A.

[0090] Thereafter, when the first drive mechanism 220 retracts the first ejector rod 211, the first ejector plate 841A retracts to the retracted limit position by the biasing force of the first return spring 845A. When the first ejector plate 841A reaches the retracted limit position, the front end face of the first pressing body 843A becomes flush with the front end face of the fixing portion 830A.

[0091] When the control device 700 advances and retracts the first ejector rod 211, it controls the position of the first ejector rod 211. The position of the first ejector rod 211 is detected, for example, using 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. Note that the first ejector rod position detector for detecting 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.

[0092] Next, with reference mainly to FIG. 7, the second ejector device 202 and the operation in which the second ejector device 202 ejects the second molded product 22 and the second unnecessary product 24 from the first movable mold 820A will be described. Note that the second ejector device 202 not only performs the operation of ejecting the second molded product 22 and the second unnecessary product 24 from the first movable mold 820A, but also performs the operation of ejecting the second molded product 22 and the second unnecessary product 24 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. Further, the second ejector device 202 constitutes a partial mold clamping force adjustment unit 290 that cooperates with the movable molds (the first movable mold 820A and the second movable mold 820B) to adjust the mold clamping force of the mold on the second fixed mold 810B side. The function of this partial mold clamping force adjustment unit 290 will be described in detail later.

[0093] The second ejector device 202 has a second ejector rod 212 that pushes the first movable part 840A and the second movable part 850A. The second ejector rod 212 is formed thicker than the first ejector rod 211 and can face the surface of the second ejector plate 851A. The second ejector rod 212 is not connected to the first movable part 840A and the second movable part 850A. The second ejector rod 212 can be removed from the turntable 520, and the turntable 520 can be rotated.

[0094] The second ejector device 202 has a second drive mechanism 230 that moves the second ejector rod 212 forward and backward. The second drive mechanism 230 includes, for example, a second ejector motor 231, a second crosshead 233, and a second motion conversion mechanism 235 that converts the rotational motion of the second ejector motor 231 into the linear motion of the second crosshead 233.

[0095] The second motion conversion mechanism 235 includes a screw shaft and a screw nut that engages with the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut. The second crosshead 233 moves in the mold opening and 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 moves forward and backward together with the second crosshead 233.

[0096] When the second drive mechanism 230 advances the second ejector rod 212 as shown in FIG. 7, the second ejector rod 212 passes through the through hole 832A of the movable mounting plate 831A and pushes the surface (the edge of the through hole 856A) of the second ejector plate 851A forward. As a result, the second ejector plate 851A advances against the biasing force of the second return spring 855A. Accordingly, the second ejector pin 852A advances and the second molded product 22 protrudes from the fixing portion 830A.

[0097] 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 biasing force of the first return spring 845A. Accordingly, the first ejector pin 842A and the first pressing body 843A advance, and the second unnecessary product 24 protrudes from the fixing portion 830A.

[0098] Thereafter, 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 biasing 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.

[0099] While the second ejector plate 851A is retracting, the first ejector plate 841A is retracted to the retracted limit position by the biasing 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.

[0100] When the control device 700 advances and retracts the second ejector rod 212, it controls the position of the second ejector rod 212. The position of the second ejector rod 212 is detected, for example, using 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. Note that the second ejector rod position detector for detecting 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.

[0101] (First injection device and second 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 during filling (for example, the negative X-axis direction) is regarded as the front, and the moving direction of the screw 330 during metering (for example, the positive X-axis direction) is regarded as the rear for description.

[0102] The first injection device 301 is installed on the first slide base 303, and the first slide base 303 is arranged to be movable forward and backward with respect to the injection device frame 920. The first injection device 301 is arranged to be movable forward and backward with respect to the mold device 800. The first injection device 301 touches the mold device 800 and fills the first cavity space 801 with the molding material by injecting the molding material into the mold device 800.

[0103] The second injection device 302 is installed on the second slide base, and the second slide base is arranged to be movable forward and backward with respect to the injection device frame 920. The second injection device 302 is arranged to be movable forward and backward with respect to the mold device 800. The second injection device 302 touches the mold device 800 and fills the second cavity space 802 with the molding material by injecting the molding material into the mold device 800.

[0104] 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 filled into the first cavity space 801 by the first injection device 301 and the molding material filled into the second cavity space 802 by the second injection device 302 may be different materials or the same material.

[0105] The first injection device 301 and the second injection device 302 are configured substantially the same. Hereinafter, the configuration of the first injection device 301 will be described, and the description of the configuration of the second injection device 302 will be omitted.

[0106] As shown in FIGS. 1 and 2, the first injection device 301 includes, for example, a cylinder 310 that heats a molding material, a nozzle 320 provided at the front end of the cylinder 310, a screw 330 rotatably and axially movably disposed in the cylinder 310, a metering motor 340 that rotates the screw 330, an injection motor 350 that axially moves the screw 330, and a load detector 360 that detects a load transmitted between the injection motor 350 and the screw 330.

[0107] The cylinder 310 heats the molding material supplied therein from the supply port 311. The molding material includes, for example, a resin or the like. 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 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.

[0108] The cylinder 310 is divided into a plurality of zones along 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. A set temperature is set for each of the plurality of zones, and the control device 700 controls the heater 313 so that the detected temperature of the temperature detector 314 becomes the set temperature.

[0109] The nozzle 320 is provided at the front end of the cylinder 310 and 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 becomes the set temperature.

[0110] The screw 330 is rotatably and reciprocally arranged in the cylinder 310. When the screw 330 is rotated, the molding material is sent forward along the spiral groove of the screw 330. The molding material is gradually melted by the heat from the cylinder 310 while being sent forward. As the liquid molding material is sent forward of the screw 330 and accumulates in the front part of the cylinder 310, the screw 330 is retracted. Then, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and fills the mold device 800.

[0111] A backflow prevention ring 331 is attached to the front part of the screw 330 so as to be reciprocally movable as a backflow prevention valve that prevents the backflow of the molding material from the front to the back of the screw 330 when the screw 330 is pushed forward.

[0112] When the screw 330 is advanced, the backflow prevention ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 and relatively retracts with respect to the screw 330 to the closing position (see FIG. 2) that closes the flow path of the molding material. Thereby, the backflow of the molding material accumulated in front of the screw 330 to the back is prevented.

[0113] On the other hand, when the screw 330 is rotated, the backflow prevention ring 331 is pushed forward by the pressure of the molding material being sent forward along the spiral groove of the screw 330, and relatively advances with respect to the screw 330 to an open position (see FIG. 1) where the flow path of the molding material is opened. Thereby, the molding material is sent forward of the screw 330. The backflow prevention ring 331 may be either a co-rotating type that rotates with the screw 330 or a non-co-rotating type that does not rotate with the screw 330. Further, the first injection device 301 may have a drive source for advancing and retracting the backflow prevention ring 331 with respect to the screw 330 between the open position and the closed position.

[0114] 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 for example, a hydraulic pump or the like may be used.

[0115] The injection motor 350 advances and retracts 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. Between the screw shaft and the screw nut, balls, rollers, or the like may be provided. The drive source for advancing and retracting the screw 330 is not limited to the injection motor 350, and for example, a hydraulic cylinder or the like may be used.

[0116] The load detector 360 detects the load transmitted between the injection motor 350 and the screw 330. The detected load is converted into pressure by the control device 700. The load detector 360 is provided in the load transmission path between the injection motor 350 and the screw 330, and detects the load acting on the load detector 360.

[0117] The load detector 360 sends a signal of the detected load to the control device 700. The load detected by the load detector 360 is converted into the pressure acting between the screw 330 and the molding material, and is used for control and monitoring of 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.

[0118] Note that the pressure detector for detecting the pressure of the molding material is not limited to the load detector 360, and a general one can be used. For example, a nozzle pressure sensor or an in-mold pressure sensor may be used. The nozzle pressure sensor is installed in the nozzle 320. The in-mold pressure sensor is installed inside the mold device 800.

[0119] The first injection device 301 performs a metering process, a filling process, a pressure holding process, etc. 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.

[0120] In the metering process, the metering motor 340 is driven to rotate the screw 330 at a set rotational speed, and the molding material is sent forward along the spiral groove of the screw 330. Along with this, the molding material is gradually melted. As the liquid molding material is sent forward of the screw 330 and accumulates in the front part of the cylinder 310, the screw 330 retreats. The rotational speed of the screw 330 is detected using, for example, the 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. Note that the screw rotational speed detector for detecting the rotational speed of the screw 330 is not limited to the metering motor encoder 341, and a general one can be used.

[0121] In the metering process, in order to limit the rapid retreat of the screw 330, the injection motor 350 may be driven to apply a set back pressure to the screw 330. The back pressure on the screw 330 is detected using, for example, the load detector 360. When the screw 330 retreats to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the metering process is completed.

[0122] The position and rotational speed of the screw 330 in the metering process are set collectively as a series of setting conditions. For example, a metering start position, a rotational speed switching position, and a metering completion position are set. These positions are arranged in this order from the front to the rear, and represent the start and end points of the section where the rotational speed is set. The rotational speed is set for each section. The rotational speed switching position may be one or more. The rotational speed switching position may not be set. Also, the back pressure is set for each section.

[0123] In the filling process, 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 into the first cavity space 801 in the mold device 800. The position and moving speed of the screw 330 are detected using, for example, the 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, the switching from the filling process to the holding pressure process (so-called V / P switching) is performed. The position where the 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, etc.

[0124] The position and moving speed of the screw 330 in the filling process are set collectively as a series of setting conditions. For example, a filling start position (also called "injection start position"), a moving speed switching position, and a V / P switching position are set. These positions are arranged in this order from the rear to the front, and represent the start and end points of the section where the moving speed is set. The moving speed is set for each section. The moving speed switching position may be one or more. The moving speed switching position may not be set.

[0125] For each section where the moving speed of the screw 330 is set, the upper limit value of the pressure of the screw 330 is set. The pressure of the screw 330 is detected by the load detector 360. When the pressure of the screw 330 is below the set pressure, the screw 330 advances at the set moving speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, for the purpose of mold protection, the screw 330 advances at a moving speed slower than the set moving speed so that the pressure of the screw 330 becomes below the set pressure.

[0126] In addition, after the position of the screw 330 reaches the V / P switching position in the filling process, 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 advanced or retracted at a very slow speed. Also, 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.

[0127] In the holding pressure process, the injection motor 350 is driven to push the screw 330 forward, keep the pressure of the molding material at the front end of the screw 330 (hereinafter, also referred to as "holding pressure") at the set pressure, and push the molding material remaining in the cylinder 310 toward the mold device 800. The insufficient molding material due to cooling shrinkage in the mold device 800 can be replenished. The holding pressure is detected, for example, using the load detector 360. The set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure process. A plurality of holding pressures and holding times for holding the holding pressure may be set respectively, and may be set together as a series of set conditions.

[0128] In the holding pressure process, the molding material in the first cavity space 801 within the mold device 800 is gradually cooled, and when the holding pressure process is completed, the inlet of the first cavity space 801 is blocked by the solidified molding material. This state is called gate sealing, which prevents the backflow of the molding material from the first cavity space 801. After the holding pressure process, the cooling process is started. In the cooling process, the solidification of the molding material in the first cavity space 801 is carried out. For the purpose of shortening the molding cycle time, the metering process may be carried out during the cooling process.

[0129] Note that the first injection device 301 of the present embodiment is of the in-line screw type, but it may also be of the pre-plug type or the like. The injection device of the pre-plug type supplies the molding material melted in the plasticizing cylinder to the injection cylinder and injects the molding material from the injection cylinder into the mold device. In the plasticizing cylinder, a screw is disposed rotatably and non-axially movable, or a screw is disposed rotatably and axially movable. On the other hand, in the injection cylinder, a plunger is disposed axially movable.

[0130] Also, the first injection device 301 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is the horizontal direction, but it may also be a vertical type in which the axial direction of the cylinder 310 is the vertical direction. The mold clamping device combined with the vertical first injection device 301 may be either vertical or horizontal. Similarly, the mold clamping device combined with the horizontal first injection device 301 may be either horizontal or vertical.

[0131] (First moving device and second moving device) In the description of the first moving device 401 and the second moving device (not shown), similar to the description of the first injection device 301 and the second injection device 302, the moving direction of the screw 330 during filling (for example, the negative X-axis direction) is regarded as the front, and the moving direction of the screw 330 during metering (for example, the positive X-axis direction) is regarded as the rear for description.

[0132] The first moving device 401 moves the first injection device 301 forward and backward 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.

[0133] The second moving device moves the second injection device 302 forward and backward 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.

[0134] 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 forward and backward independently.

[0135] The first moving device 401 and the second moving device are configured in the same manner. Therefore, hereinafter, the configuration of the first moving device 401 will be described, and the description of the configuration of the second moving 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.

[0136] 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. By switching the rotation direction of the motor 420, 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. Note that the hydraulic pump 410 can also suck hydraulic fluid from the tank and discharge the hydraulic fluid from one of the first port 411 and the second port 412.

[0137] The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 with a rotation direction and a rotation torque according to a control signal from the control device 700. The motor 420 may be an electric motor or may be an electric servo motor.

[0138] 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.

[0139] 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. By supplying the hydraulic fluid discharged from the first port 411 to the front chamber 435 via the first flow path 413, the first injection device 301 is pushed forward. The first injection device 301 advances, and the nozzle 320 of the first injection device 301 is pressed against the fixed mold 810. The front chamber 435 functions as a pressure chamber that generates the nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410.

[0140] 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. By supplying the hydraulic fluid discharged from the second port 412 to the rear chamber 436 of the hydraulic cylinder 430 via the second flow path 414, the first injection device 301 is pushed backward. The first injection device 301 retreats, and the nozzle 320 of the first injection device 301 is separated from the fixed mold 810.

[0141] In this embodiment, the first moving device 401 includes the hydraulic cylinder 430, but the present invention is not limited thereto. 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 the linear motion of the first injection device 301 may be used.

[0142] (Control device) The control device 700 is configured by, for example, a computer and includes 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. 1 and 2. By executing the program stored in the storage medium 702 by the CPU 701, the control device 700 performs various controls. Further, the control device 700 receives a signal from the outside through the input interface 703 and transmits a signal to the outside through the output interface 704.

[0143] The control device 700 repeatedly manufactures the first molded product 21 and the second molded product 22 by repeatedly performing a metering process, a mold closing process, a pressure boosting process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a pressure releasing process, a mold opening process, a pushing out process, and a mold rotating process. A series of operations for obtaining the first molded product 21 and the second molded product 22, for example, the operations from the start of the metering process to the start of the next metering process, are also called "shots" or "molding cycles". Also, the time required for one shot is also called the "molding cycle time" or "cycle time".

[0144] One molding cycle has, for example, a metering process, a mold closing process, a pressure boosting process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a pressure releasing process, a mold opening process, a pushing out process, and a mold rotating process in this order. The order here is the order of the start of each process. The filling process, the pressure holding process, and the cooling process are performed during the mold clamping process. The start of the mold clamping process may coincide with the start of the filling process. The end of the pressure releasing process coincides with the start of the mold opening process.

[0145] Note that, for the purpose of shortening the molding cycle time, a plurality of processes may be performed simultaneously. For example, the metering process may be performed during the cooling process of the previous molding cycle or during the mold clamping process. In this case, the mold closing process may be performed first in the molding cycle. Further, the filling process may be started during the mold closing process. Also, the ejection process may be started during the mold opening process. When a switching valve for opening and closing the flow path of the nozzle 320 is provided, the mold opening process may be started during the metering process. This is because even if the mold opening process is started during the metering process, the molding material does not leak from the nozzle 320 as long as the switching valve closes the flow path of the nozzle 320.

[0146] Note that one molding cycle may include processes other than the metering process, mold closing process, pressure boosting process, mold clamping process, filling process, pressure holding process, cooling process, pressure releasing process, mold opening process, ejection process, and mold rotation process.

[0147] For example, after the completion of the pressure holding process and before the start of the metering process, a pre-metering cushioning process of retracting the screw 330 to a preset metering start position may be performed. The pressure of the molding material accumulated in front of the screw 330 before the start of the metering process can be reduced, and a sudden retraction of the screw 330 at the start of the metering process can be prevented.

[0148] Also, after the completion of the metering process and before the start of the filling process, a post-metering cushioning process of retracting the screw 330 to a preset filling start position (also referred to as the "injection start position") may be performed. The pressure of the molding material accumulated in front of the screw 330 before the start of the filling process can be reduced, and leakage of the molding material from the nozzle 320 before the start of the filling process can be prevented.

[0149] The control device 700 is connected to an operating device 750 that receives input operations by the user and a display device 760 that displays a screen. The operating device 750 and the display device 760 according to the embodiment are arranged on the positive Y-axis side. That is, in the injection molding machine 10, the positive Y-axis side is the operation side of the device, and the negative Y-axis side is the counter-operation side of the device.

[0150] The operation device 750 and the display device 760 may be configured by, for example, a touch panel 770 and integrated. The touch panel 770 as the display device 760 displays a screen under the control of the control device 700. On the screen of the touch panel 770, information such as the settings of the injection molding machine 10 and the current state of the injection molding machine 10 may be displayed. Further, on the screen of the touch panel 770, operation parts such as buttons and input fields for receiving input operations by the user may be displayed. The touch panel 770 as the operation device 750 detects an input operation on the screen by the user and outputs a signal corresponding to the input operation to the control device 700. Thereby, for example, the user can operate the operation parts provided on the screen while checking the information displayed on the screen to perform settings (including input of set values) of the injection molding machine 10 and the like. Further, by the user operating the operation parts provided on the screen, the operation of the injection molding machine 10 corresponding to the operation parts can be made to be performed. Note that the operation of the injection molding machine 10 may be, for example, the operation (including stop) of 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, the second moving device (not shown), and the like. Further, the operation of the injection molding machine 10 may be the switching of the screen displayed on the touch panel 770 as the display device 760 and the like.

[0151] Note that although the operation device 750 and the display device 760 of the present embodiment have been described as being integrated as the touch panel 770, they may be provided independently. Further, a plurality of operation devices 750 may be provided. The operation device 750 and the display device 760 are arranged on the operation side (negative Y-axis direction) of the mold clamping device 100 (more specifically, the fixed platen 110).

[0152] (Mold clamping force suppression part and partial mold clamping force adjustment part) Next, the mold clamping force suppression unit 190 and the partial mold clamping force adjustment unit 290 provided in the injection molding machine 10 according to the embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a perspective view schematically showing a part of the second fixed mold 810B and the fixed platen 110. FIG. 9(A) is a horizontal cross-sectional view showing the mold clamping force of each mold at the end of the pressure boosting process. FIG. 9(B) is a horizontal cross-sectional view showing the mold clamping force of each mold at the disclosure of the filling process.

[0153] As shown in FIG. 8, the mold clamping force suppression unit 190 according to the embodiment is composed of a pair (two) of pillars 191 provided on the opposing surface of the fixed platen 110 facing the movable platen 120. Each pillar 191 extends linearly from the fixed platen 110 toward the movable platen 120 and has a set length. Note that the number of pillars 191 of the mold clamping force suppression unit 190 is not particularly limited, and it may have a configuration with one pillar or a configuration with three or more pillars.

[0154] The pair of pillars 191 are installed at adjacent positions on the opposite operation side of the second fixed mold 810B. In the plan view of the mold clamping device 100 shown in FIGS. 3 to 7, the pair of pillars 191 overlap each other. In other words, each pillar 191 is arranged at a position adjacent to the second fixed mold 810B but not adjacent to the first fixed mold 810A in the direction in which the first fixed mold 810A and the second fixed mold 810B are arranged. Thereby, the mold clamping force suppression unit 190 can reduce the mold clamping force between the second fixed mold 810B and the movable mold while ensuring the mold clamping force between the first fixed mold 810A and the movable molds (the first movable mold 820A, the second movable mold 820B) (see also FIG. 9(A)). Note that the pair of pillars 191 may be provided at adjacent positions on the operation side of the second fixed mold 810B.

[0155] A pair of pillars 191 are installed at intervals along the vertical direction (Z-axis direction). The upper surface of the upper pillar 191 among each pair of pillars 191 is arranged at a position slightly lower than the upper side of the second fixed mold 810B. The interval between the upper pillar 191 and the second fixed mold 810B is shorter than the interval between the pair of pillars 191. In other words, the upper pillar 191 is arranged near the upper end of the second fixed mold 810B. The upper surface of the lower pillar 191 among the pair of pillars 191 is arranged at a position slightly higher than the lower side of the second fixed mold 810B. The interval between the lower pillar 191 and the second fixed mold 810B is shorter than the interval between the pair of pillars 191. In other words, the lower pillar 191 is arranged near the lower end of the second fixed mold 810B. In this way, each pillar 191 is installed at equal intervals above and below from the central position of the second fixed mold 810B in the Z-axis direction. Thereby, the mold clamping force suppression part 190 can stably receive the mold clamping force and avoid applying a mold clamping force separated from the second fixed mold 810B.

[0156] Each pillar 191 is formed in a solid columnar shape and has a square shape with rounded corners in a cross-sectional view perpendicular to the extending direction. The protruding end face 191s in the negative X-axis direction of each pillar 191 is formed flat and can be in surface contact with the turntable 520 of the movable platen 120. The contact part of the protruding end face 191s or the turntable 520 may be provided with a buffer part or the like for dispersing the load applied during mold clamping.

[0157] Each pillar 191 can disperse and receive the mold clamping force applied to the second fixed mold 810B, which is the pressing force of the movable platen 120, in a state of being in contact with the movable platen 120. Thereby, the mold clamping force suppression part 190 can reduce the mold clamping force when clamping the first movable mold 820A or the second fixed mold 810B with respect to the second fixed mold 810B.

[0158] Each pillar 191 has a rigidity such that even when the protruding end face 191s contacts the movable platen 120 and a pressing force is applied from the movable platen 120, bending, buckling, toppling, etc. do not occur. Each pillar 191 may be provided with reinforcing portions such as grooves, ribs, support pieces, etc. in order to enhance the rigidity. The material constituting each pillar 191 is not particularly limited, but for example, a hard material such as stainless steel can be applied.

[0159] The length of each pillar 191 in the mold opening and closing direction (X-axis direction) substantially coincides with the sum of the length of the second fixed mold 810B in the mold opening and closing direction and the length of the first movable mold 820A or the second movable mold 820B in the mold opening and closing direction. Therefore, when the movable platen 120 is moved with respect to the fixed platen 110 to perform the pressure increasing process and the mold clamping process, each pillar 191 according to the embodiment can make the mold clamping force between the second fixed mold 810B and the movable mold (the first movable mold 820A, the second movable mold 820B) zero. Note that each pillar 191 may generate a certain amount of mold clamping force between the second fixed mold 810B and the movable mold in the pressure increasing process and the mold clamping process. The mold clamping force between the second fixed mold 810B and the movable mold is a lower force than the mold clamping force between the first fixed mold 810A and the movable mold. For example, the mold clamping force between the second fixed mold 810B and the movable mold during mold clamping is preferably set to 1 / 2 or less of the mold clamping force between the first fixed mold 810A and the movable mold.

[0160] On the other hand, a partial mold clamping force adjusting unit 290 has a function of temporarily increasing (adjusting) the mold clamping force between the second fixed mold 810B and the movable mold (the first movable mold 820A, the second movable mold 820B) whose mold clamping force has been made zero or small by the mold clamping force suppressing unit 190 during injection molding after mold clamping. This "during injection molding" includes the periods of the mold clamping process, the filling process, and the pressure holding process of the mold clamping device 100. Furthermore, the cooling process may be included during injection molding. In short, during injection molding is the period during which the molding material is injected into the mold device 800 clamped by the mold clamping device 100 to surely mold the second molded product 22, and can be set to any period from the start timing of the mold clamping process (that is, after mold clamping) to the start timing of the pressure release process.

[0161] The partial clamping force adjusting unit 290 can apply various configurations such as ejector compression for increasing the clamping force by the second ejector device 202, fixed platen compression for increasing the clamping force from the fixed platen 110 side, and movable die compression for increasing the clamping force from the movable platen 120 side. The partial clamping force adjusting unit 290 according to the embodiment exemplifies a configuration that performs ejector compression using the second ejector device 202.

[0162] For example, as shown in FIGS. 9(A) and 9(B), when adjusting the clamping force between the second movable die 820B and the second fixed die 810B, the partial clamping force adjusting unit 290 is realized by the configuration of the second ejector device 202 and the second movable die 820B. When adjusting the clamping force between the first movable die 820A and the second fixed die 810B by rotating the turntable 520, the partial clamping force adjusting unit 290 is realized by the configuration of the second ejector device 202 and the first movable die 820A. The first movable die 820A and the second movable die 820B are configured substantially the same. Hereinafter, the second ejector device 202 and the second movable die 820B will be described, and the description of the first movable die 820A will be omitted.

[0163] As described above, the second ejector device 202 advances the second ejector rod 212 in the positive X-axis direction (toward the fixed platen 110 side). As the second ejector rod 212 advances, it pushes the second ejector plate 851B of the second movable die 820B forward. When the second ejector plate 851B of the second movable die 820B is pushed, the second movable die 820B integrally advances the first ejector pin 842B along with the first ejector plate 841B, the second ejector plate 851B, and the second ejector pin 852B. As a result, the second pressing body 843B fixed to the tip of the first ejector pin 842B advances toward the second fixed die 810B. Consequently, the second movable die 820B can generate a clamping force between the second pressing body 843B and the second fixed die 810B.

[0164] In other words, during injection molding, the second ejector device 202 can apply an appropriate clamping force between the second movable mold 820B and the second fixed mold 810B by transmitting the forward force of the second ejector rod 212 to the second pressing body 843B. The clamping force in this case is a pressure that can ensure good gas escape without collapsing the air vents between the second movable mold 820B and the second fixed mold 810B while not causing burrs on the second molded product 22. The clamping force between the second movable mold 820B and the second fixed mold 810B during injection molding is a pressure smaller than the clamping force between the adjacent first movable mold 820A and the first fixed mold 810A. In particular, the partial clamping force adjustment unit 290 can reduce the load on the mold by generating a clamping force between the second movable mold 820B and the second fixed mold 810B only during injection molding.

[0165] Further, the control device 700 recognizes the position of the second pressing body 843B and controls the rotation of the second ejector motor 231 based on the signal of the detection result of the second ejector motor encoder 232 that detects the position of the second ejector rod 212. Thereby, the control device 700 can accurately adjust the clamping force between the second pressing body 843B and the first fixed mold 810A by moving the second pressing body 843B to an appropriate target position during injection molding.

[0166] As described above, the injection molding machine 10 has a clamping force suppression unit 190 that makes the clamping force of some molds (the second fixed mold 810B and the movable molds (the first movable mold 820A, the second movable mold 820B)) smaller than the clamping force of other molds (the first fixed mold 810A and the movable molds (the first movable mold 820A, the second movable mold 820B)) during mold clamping. Thereby, the clamping force applied to some molds can be dispersed to the clamping force suppression unit 190, and the clamping force of some molds can be reduced. As a result, the load on some molds is reduced, and it becomes possible to extend the life and maintenance cycle.

[0167] In addition, the injection molding machine 10 has a partial clamping force adjustment unit 290 that adjusts the clamping force of some molds (the second fixed mold 810B and the movable molds (the first movable mold 820A and the second movable mold 820B)) during injection molding. Therefore, the injection molding machine 10 can perform clamping without applying an excessive clamping force to some molds during injection molding. As a result, it is possible to promote gas escape from some molds and prevent bubbles from generating in the molded product, and it is also possible to prevent the occurrence of short products.

[0168] Furthermore, since the clamping force suppression unit 190 protrudes from the fixed platen 110 toward the movable platen 120, for example, it is possible to avoid the clamping force suppression unit 190 from affecting the movable platen 120 that rotates. The clamping force suppression unit 190 arranges each pillar 191 at a position adjacent to some molds while not adjacent to other molds in the Y-axis direction, so that the clamping force of some molds can be favorably reduced without changing the clamping force of other molds. And the clamping force suppression unit 190 includes a plurality of pillars 191 in the Z-axis direction (a direction orthogonal to the direction in which some molds and other molds are arranged), so that the clamping force applied between the fixed platen 110 and the movable platen 120 during clamping can be stably received.

[0169] Moreover, the partial clamping force adjustment unit 290 adjusts the clamping force between a pressing body (the first pressing body 843A and the second pressing body 843B) that moves as the second ejector device 202 advances and a mold (the second fixed mold 810B) facing the pressing body. Thereby, the injection molding machine 10 can easily and accurately adjust the clamping force of some molds without making major changes to the clamping device 100 and the mold device 800.

[0170] Note that the injection molding machine 10 according to the present disclosure is not limited to the above-described embodiment and can take various modifications. For example, the injection molding machine 10 is configured to perform injection molding with two molds combined with the first fixed mold 810A, the second fixed mold 810B, the first movable mold 820A, and the second movable mold 820B. However, the number of molds of the injection molding machine 10 is not limited to two and may be three or more.

[0171] Further, the injection molding machine 10 according to the embodiment is configured to perform two-material molding by rotating a plurality of movable molds (the first movable mold 820A and the second movable mold 820B) by a turntable 520. However, the injection molding machine 10 may be a device that repeatedly performs molding of a molded product in a short cycle between opposing fixed molds without rotating the plurality of movable molds.

[0172] Also, for example, the clamping force suppression unit 190 is not limited to a configuration in which pillars 191 are provided on the fixed platen 110, and may be provided on the movable platen 120 side (as an example, the turntable 520). That is, the clamping force suppression unit 190 may have a configuration including one or more pillars protruding from the movable platen 120 toward the fixed platen 110. Even in this case, the clamping force of some of the plurality of molds can be made smaller than the clamping force of other molds.

[0173] Furthermore, depending on the target clamping forces of the two molds, the clamping force suppression unit 190 may be configured to reduce the clamping force on the first fixed mold 810A side. In this case, the clamping force suppression unit 190 is preferably provided on the operating side of the first fixed mold 810A.

[0174] FIG. 10(A) is a horizontal cross-sectional view showing a partial clamping force adjustment unit 290A according to the first modification. FIG. 10(B) is an enlarged horizontal cross-sectional view showing the partial clamping force adjustment unit 290A during injection molding. The partial clamping force adjustment unit 290A according to the first modification is different from the partial clamping force adjustment unit 290 according to the embodiment in that it performs fixed platen compression to increase the clamping force from the fixed platen 110 side.

[0175] The partial clamping force adjustment unit 290A adjusts the clamping force of the mold during injection molding by relatively moving the second fixed mold 810B with respect to the fixed platen 110 and the movable mold (the first movable mold 820A or the second movable mold 820B). Specifically, the partial clamping force adjustment unit 290A includes a holding body 115 that holds the second fixed mold 810B, and one or more clamping actuators 119 that move the holding body 115 forward and backward relative to the fixed platen 110.

[0176] The holding body 115 is disposed on the surface of the fixed platen 110 that faces the movable platen 120. The holding body 115 is configured as a separate body from the fixed platen 110. The holding body 115 fixes the second fixed mold 810B to the surface facing the movable platen 120. The holding body 115 is formed in a plate shape having an appropriate thickness in the mold opening and closing direction and has rigidity capable of holding the second fixed mold 810B. Further, the holding body 115 is provided with a hole in the central portion through which the second injection device 302 can be inserted.

[0177] For example, a pair (two) of mold clamping actuators 119 are provided along the Y-axis direction and are arranged at symmetric positions sandwiching the second injection device 302 therebetween. Each mold clamping actuator 119 has a shaft 119s connected to the holding body 115, and moves the holding body 115 by advancing and retracting the shaft 119s under the control of the control device 700. The configuration of each mold clamping actuator 119 is not particularly limited, and a configuration having a drive transmission part such as a motor and a ball screw mechanism, a cylinder mechanism, etc. may be appropriately adopted.

[0178] Further, the partial mold clamping force adjustment unit 290A may include a position detection unit that detects the position of the holding body 115, a pressure detection unit that detects the pressure applied to the holding body 115 or the mold clamping actuator 119, etc. Thereby, the control device 700 can control the drive of the mold clamping actuator 119 based on the detection information of each detection unit.

[0179] As described above, during injection molding, the partial mold clamping force adjustment unit 290A relatively moves the second fixed mold 810B side toward the movable molds (the first movable mold 820A, the second movable mold 820B) to increase and adjust the mold clamping force. Even in this case, the partial mold clamping force adjustment unit 290A can appropriately adjust the mold clamping force between the second fixed mold 810B and the movable molds. Therefore, the partial mold clamping force adjustment unit 290A suppresses the occurrence of burrs or the like on the second molded product 22 due to insufficient mold clamping force and can smoothly exhaust gas from the second cavity space 802.

[0180] In this way, while the injection molding machine 10 suppresses the clamping force between the second fixed mold 810B and the movable mold by the clamping force suppression unit 190 (pillar 191), the partial clamping force adjustment unit 290A can adjust the clamping force between the second fixed mold 810B and the movable mold to an appropriate value during injection molding. As a result, the injection molding machine 10 can accurately mold each of the first molded product 21 and the second molded product 22, and high-quality molded products can be obtained.

[0181] FIG. 11 is a horizontal cross-sectional view showing a partial clamping force adjustment unit 290B according to the second modification. The partial clamping force adjustment unit 290B according to the second modification is different from the above-described partial clamping force adjustment units 290 and 290A in that movable mold compression for increasing the clamping force is performed from the movable platen 120 side without relying on the second ejector device 202.

[0182] The partial clamping force adjustment unit 290B adjusts the clamping force of the mold during injection molding by relatively moving the movable mold with respect to the fixed platen 110 and the movable mold (the first movable mold 820A or the second movable mold 820B). Specifically, the partial clamping force adjustment unit 290B includes a pair of holding bodies 125 that hold the first movable mold 820A and the second movable mold 820B, respectively, and one or more clamping actuators 129 that move the holding bodies 125 forward and backward relative to the movable platen 120.

[0183] Each holding body 125 is disposed on a surface facing the turntable 520 of the movable platen 120. Each holding body 125 is configured separately from the turntable 520. The holding body 125 fixes the movable mold (the first movable mold 820A or the second movable mold 820B) to a surface facing the fixed platen 110.

[0184] Each type of clamping actuator 129 is provided, for example, in two places inside the turntable 520 and is arranged at symmetric positions sandwiching the second ejector rod 212 (see FIG. 3). Each type of clamping actuator 129 has a shaft 129s that connects to the holder 125, and moves the holder 125 by advancing and retracting the shaft 129s under the control of the control device 700. The configuration of each type of clamping actuator 129 is not particularly limited, and a configuration having a drive transmission part such as a motor and a ball screw mechanism, a cylinder mechanism, etc. may be appropriately adopted.

[0185] Also, the partial clamping force adjustment part 290B may also be provided with a position detection part that detects the position of each holder 125, a pressure detection part that detects the pressure applied to each holder 125 or each type of clamping actuator 129, etc. Thereby, the control device 700 can control the driving of the clamping actuator 129 based on the detection information of the detection part.

[0186] As described above, during injection molding, the partial clamping force adjustment part 290B relatively moves the movable mold (first movable mold 820A, second movable mold 820B) side toward the second fixed mold 810B to increase and adjust the clamping force. Even in this case, the clamping force between the second fixed mold 810B and the movable mold (first movable mold 820A, second movable mold 820B) can be appropriately adjusted. Therefore, the partial clamping force adjustment part 290B suppresses the occurrence of burrs or the like on the second molded product 22 due to insufficient clamping force, and can smoothly exhaust gas from the second cavity space 802.

[0187] The injection molding machine 10 according to the embodiment disclosed this time is illustrative in all respects and not restrictive. The embodiment can be deformed and improved in various forms without departing from the scope and gist of the appended claims. The matters described in the above plurality of embodiments can also adopt other configurations within a non - conflicting range, and can be combined within a non - conflicting range.

Explanation of Reference Numerals

[0188] 10 Injection molding machine 100 Clamping device 102 Moving mechanism 110 Fixed platen 120 Movable platen 190 Clamping force suppression part 201 First ejector device 202 Second ejector device 290, 290A, 290B Partial clamping force adjustment parts 800 Mold device 810A First fixed mold 810B Second fixed mold 820A First movable mold 820B Second movable mold

Claims

1. A movable platen having a plurality of movable molds independent of each other, A fixed platen having a plurality of fixed molds capable of facing each of the plurality of movable molds, An injection molding machine comprising a moving mechanism for relatively moving the movable platen in the mold opening and closing direction with respect to the fixed platen, The movable platen or the fixed platen has a mold clamping force suppression portion that makes the mold clamping force of some of the plurality of movable molds and the plurality of fixed molds smaller than the mold clamping force of other molds when the plurality of movable molds and the plurality of fixed molds are clamped, During injection molding after clamping of the plurality of movable molds and the plurality of fixed molds, it has a partial mold clamping force adjustment portion for adjusting the mold clamping force of the some molds, Injection molding machine.

2. The mold clamping force suppression portion is one or more pillars protruding from the fixed platen toward the movable platen or protruding from the movable platen toward the fixed platen, The injection molding machine according to Claim 1.

3. The one or more pillars are arranged at a position adjacent to the some molds while not adjacent to the other molds in the direction in which the some molds and the other molds are arranged, The injection molding machine according to Claim 2.

4. A plurality of the one or more pillars are provided in a direction orthogonal to the direction in which the some molds and the other molds are arranged, The injection molding machine according to Claim 2.

5. The partial mold clamping force adjustment portion adjusts the mold clamping force of the some molds by moving one of the plurality of movable molds and the plurality of fixed molds constituting the some molds relative to the other, The injection molding machine according to any one of Claims 1 to 4.

6. It is provided with an ejector device that advances into the cavity space formed between the plurality of movable molds and the plurality of fixed molds to take out the molded product, The partial mold clamping force adjustment portion adjusts the mold clamping force between a pressing body that moves along with the advancement of the ejector device and a mold facing the pressing body, The injection molding machine according to Claim 5.

7. The partial mold clamping force adjustment portion adjusts the mold clamping force of the some molds by relatively moving the some fixed molds toward the movable platen with respect to the fixed platen, The injection molding machine according to Claim 5.

8. The partial mold clamping force adjustment portion adjusts the mold clamping force of the some molds by relatively moving the some movable molds toward the fixed platen with respect to the movable platen, The injection molding machine according to claim 5.

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