Control device for injection molding machine, injection molding machine, and control method for injection molding machine

Abstract

The invention provides a technology for suppressing opening of a mold device due to filling pressure of a molding material during mold clamping. The control device is a control device for an injection molding machine in which a first cavity space and a second cavity space formed between a fixed mold and a movable mold, respectively, are filled with a molding material during mold closing of a mold device having the fixed mold and the movable mold. When the mold is closed, the control device separates an interval between a first peak timing at which the filling pressure for filling the first cavity space with the molding material becomes the maximum value and a second peak timing at which the filling pressure for filling the second cavity space with the molding material becomes the maximum value.

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2023-122786 filed on Jul. 27, 2023. The entire contents of the Japanese Patent Application are incorporated herein by reference.

[0002] The invention relates to a control device of an injection molding machine, an injection molding machine and a control method of the injection molding machine. Background Art

[0003] The injection molding machine for two-color molding of Patent Document 1 comprises: a mold clamping device, which is arranged on a machine base; and a pair of injection devices, which are arranged in a left-right arrangement. The mold clamping device comprises: a fixed table fixed to the center of the machine base; a supporting table fixed to the end of the machine base; four connecting rods mounted between the supporting table and the fixed table; a movable table slidably mounted on each connecting rod; and a mold clamping cylinder that moves the movable table forward and backward. A rotating table is arranged in an overlapping manner on the front surface of the movable table (the surface opposite to the fixed table), and two movable molds are installed on the front surface of the rotating table. On the other hand, two fixed molds are installed on the rear surface of the fixed table (the surface opposite to the rotating table). Every time the rotating table rotates 180°, the combination of the movable mold and the fixed mold that fit each other changes.

[0004] The molding die of patent document 2 simultaneously forms a first cavity space for molding a first split body, a second cavity space for molding a second split body, and a third cavity space for welding the first split body and the second split body. The molding die has a first sliding die and a second sliding die. The first sliding die has a first punch portion, a second die portion, a first die portion, and a second punch portion in sequence from the upper side to the lower side on the surface opposite to the second sliding die. On the other hand, the second sliding die has a second punch portion, a first die portion, a second die portion, and a first punch portion in sequence from the upper side to the lower side on the surface opposite to the first sliding die.

[0005] According to Patent Document 2, if the mold is closed when the first sliding mold is in the upper position and the second sliding mold is in the lower position, the first cavity space, the third cavity space and the second cavity space are formed in sequence from the upper side to the lower side. The first cavity space is formed between the second die portion of the first sliding mold and the second convex portion of the second sliding mold. The third cavity space is formed between the first die portion of the first sliding mold and the first die portion of the second sliding mold. The second cavity space is formed between the second convex portion of the first sliding mold and the second die portion of the second sliding mold.

[0006] Furthermore, according to Patent Document 2, if the mold is closed when the first sliding mold is located at the lower position and the second sliding mold is located at the upper position, the second cavity space, the third cavity space, and the first cavity space are formed in sequence from the upper side to the lower side. The second cavity space is formed between the first convex mold portion of the first sliding mold and the first concave mold portion of the second sliding mold. The third cavity space is formed between the second concave mold portion of the first sliding mold and the second concave mold portion of the second sliding mold. The first cavity space is formed between the first concave mold portion of the first sliding mold and the first convex mold portion of the second sliding mold.

[0007] Patent Document 1: Japanese Patent Application Publication No. 2015-205395

[0008] Patent Document 2: Japanese Patent Application Publication No. 2004-276528

[0009] In two-color molding, two-sided molds are used, and the clamping force is dispersed over a larger area. If the molding material is filled into the interior of the two-sided mold at the same time, the clamping force is insufficient, and sometimes the mold device opens. The problem of the mold device opening due to the filling pressure of the molding material during mold clamping can also occur in molding other than two-color molding. Summary of the invention

[0010] One embodiment of the present invention provides a technology for suppressing the opening of a mold device due to the filling pressure of a molding material during mold clamping.

[0011] A control device according to one embodiment of the present invention is a control device for an injection molding machine, which, when a mold device having a fixed mold and a movable mold is molded, fills a first cavity space and a second cavity space respectively formed between the fixed mold and the movable mold with a molding material. The control device, when the mold is closed, places an interval between a first peak timing at which a filling pressure of the molding material filled into the first cavity space becomes a maximum value and a second peak timing at which a filling pressure of the molding material filled into the second cavity space becomes a maximum value.

[0012] Effects of the Invention

[0013] According to one aspect of the present invention, it is possible to suppress the mold assembly from opening due to the filling pressure of the molding material during mold clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing a state of the injection molding machine according to one embodiment when mold opening is completed.

[0015] Figure 2 It is a diagram showing a state of the injection molding machine according to one embodiment when the mold is clamped.

[0016] Figure 3 It is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the first rotation angle and the mold is closed.

[0017] Figure 4 This is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the first rotation angle and mold opening is completed.

[0018] Figure 5 It is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the second rotation angle and the mold is closed.

[0019] Figure 6 It is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the second rotation angle and mold opening is completed.

[0020] Figure 7 This is a vertical cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the first rotation angle and the mold is closed.

[0021] Figure 8 (A) is a diagram showing a reference example of the temporal changes in the actual values ​​of the first filling pressure, the second filling pressure, and the mold clamping force. Figure 8 (B) is a diagram showing an example of the temporal changes in the actual values ​​of the first filling pressure, the second filling pressure, and the mold clamping force.

[0022] Fig. 9 It is a diagram showing a mold device involved in the first modification.

[0023] In the figure: 10 - injection molding machine, 700 - control device, 800 - mold device, 801 - first cavity space, 802 - second cavity space, 810 - fixed mold, 820 - movable mold. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each of the drawings, the same or corresponding structures are sometimes denoted by the same reference numerals, and the description thereof is omitted.

[0025] Figure 1 This is a diagram showing a state of the injection molding machine according to one embodiment when mold opening is completed. Figure 2 It is a diagram showing a state of the injection molding machine according to one embodiment when the mold is clamped. Figure 3 It is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the first rotation angle and the mold is closed. Figure 4This is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the first rotation angle and mold opening is completed. Figure 5 It is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the second rotation angle and the mold is closed. Figure 6 It is a horizontal cross-sectional view showing a state of the mold device when the rotation angle of the turntable according to one embodiment is the second rotation angle and mold opening is completed. Figure 7 1 is a vertical cross-sectional view showing a state of a mold device when the rotation angle of the turntable according to one embodiment is the first rotation angle and the mold is closed. Figure 1 and Figure 2 is along Figure 3 Vertical cross-sectional view taken along line II.

[0026] In this specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other. The X-axis direction and the Y-axis direction represent horizontal directions, and the Z-axis direction represents a vertical direction. When the mold clamping device 100 is horizontal, the X-axis direction is the mold opening and closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The negative side of the Y-axis direction is called the operating side, and the positive side of the Y-axis direction is called the opposite side of the operating side.

[0027] like Figure 1 to Figure 7 As shown, the injection molding machine 10 includes a mold clamping device 100 for opening and closing a mold device 800, a first ejector device 201 for ejecting a first product 23 molded by the mold device 800, a second ejector device 202 for ejecting both a second molded product 22 and a second product 24 molded by the mold device 800, a first injection device 301 for injecting a molding material into the mold device 800, a second injection device 302 for injecting a molding material into the mold device 800, a first moving device 401 for advancing and retracting the first injection device 301 relative to the mold device 800, a second moving device (not shown) for advancing and retracting the second injection device 302 relative to the mold device 800, a control device 700 for controlling the components of the injection molding machine 10, and a frame 900 for supporting the components of the injection molding machine 10. The frame 900 includes a mold clamping device frame 910 and an injection device frame 920. The mold clamping device frame 910 and the injection device frame 920 are respectively installed on the floor 2 via leveling casters 930. The control device 700 is arranged in the internal space of the injection device frame 920. Hereinafter, each component of the injection molding machine 10 will be described.

[0028] (Mold clamping device)

[0029] In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (for example, the positive direction of the X axis) is set to the front, and the moving direction of the movable platen 120 when the mold is opened (for example, the negative direction of the X axis) is set to the rear. The mold clamping device 100 performs mold closing, pressure increase, mold clamping, pressure relief, and mold opening of the mold device 800. The mold device 800 includes a fixed mold 810 and a movable mold 820.

[0030] like Figure 3 and Figure 5 As shown, the fixed mold 810 has a first fixed molding surface 811 and a second fixed molding surface 812 on the surface opposite to the movable mold 820. The first fixed molding surface 811 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 second fixed molding surface 812 forms a part of the wall surface of the second cavity space 802 where the second molded product 22 is molded. The first fixed molding surface 811 and the second fixed molding surface 812 are formed in different shapes, for example, each is formed in a concave shape. The first fixed molding surface 811 and the second fixed molding surface 812 are formed on the same fixed mold plate in the present embodiment, but may also be formed on different fixed mold plates as described in Patent Document 1.

[0031] The fixed mold 810 has a plurality of plates 813, 814, and 815 stacked in the mold opening and closing direction. The plate 813 mounted on the fixed platen 110 is referred to as a fixed mounting plate 813. The plate 815 forming the first cavity space 801 and the second cavity space 802 is referred to as a fixed template 815. The plate 814 disposed between the fixed mounting plate 813 and the fixed template 815 is referred to as an intermediate plate 814.

[0032] The movable mold 820 has a first movable molding surface 821 and a second movable molding surface 822 on the surface facing the fixed mold 810. Figure 3 and Figure 5 As shown, the first movable molding surface 821 and the second movable molding surface 822 respectively form a part of the wall surface of the first cavity space 801 and a part of the wall surface of the second cavity space 802 in sequence. The first movable molding surface 821 and the second movable molding surface 822 are formed in the same shape, for example, they are formed in a convex shape. The first movable molding surface 821 and the second movable molding surface 822 are formed on the same movable mold plate in this embodiment, but can also be formed on different movable mold plates as described in Patent Document 1.

[0033] The movable mold 820 has a plurality of plates 823, 824, and 825 stacked in the mold opening and closing direction. The plate 823 mounted on the movable platen 120 via the rotating table 520 is referred to as a movable mounting plate 823. The plate 825 forming the first cavity space 801 and the second cavity space 802 is referred to as a movable die plate 825. The plate 824 disposed between the movable mounting plate 823 and the movable die plate 825 is referred to as a spacer 824. The spacer 824 forms a space between the movable mounting plate 823 and the movable die plate 825.

[0034] like Figure 4 and Figure 6 As shown, the movable mold 820 includes a fixed portion 830 fixed to the movable platen 120, a first movable portion 840 for ejecting both the first waste product 23 and the second waste product 24 from the fixed portion 830, and a second movable portion 850 for ejecting the second molded product 22 from the fixed portion 830. A plurality of sets of the first movable portion 840 and the second movable portion 850 are provided.

[0035] The fixing part 830 includes a movable mounting plate 823, a cushion block 824, and a movable template 825. A through hole 823a is formed on the movable mounting plate 823 for sequentially inserting and removing the first ejection rod 211 and the second ejection rod 212. The diameter of the through hole 823a is larger than the diameter of the first ejection rod 211 and the diameter of the second ejection rod 212.

[0036] The first movable portion 840 includes, for example, a first ejector plate 841 disposed perpendicularly to the mold opening and closing direction and a rod-shaped first ejector pin 842 extending forward from the first ejector plate 841 .

[0037] The first ejector plate 841 is disposed in the space between the movable mounting plate 823 and the movable die plate 825. The first ejector plate 841 moves forward and backward along the guide pins 829 parallel to the die opening and closing direction. The first ejector plate 841 is urged away from the movable die plate 825 by the first return spring 843.

[0038] The first ejector pin 842 is arranged to be able to move forward and backward in a first pin hole that penetrates the movable die plate 825 in the mold opening and closing direction. The front end surface of the first ejector pin 842 abuts against the first scrap 23 or the second scrap 24.

[0039] The second movable portion 850 includes, for example, a second ejector plate 851 disposed perpendicularly to the mold opening and closing direction and a rod-shaped second ejector pin 852 extending forward from the second ejector plate 851 .

[0040] The second ejector plate 851 is disposed in the space between the movable mounting plate 823 and the movable die plate 825. The second ejector plate 851 moves forward and backward along the guide pins 829 parallel to the die opening and closing direction. The second ejector plate 851 is urged by the second return spring 853 in a direction away from the movable die plate 825.

[0041] The second ejector plate 851 is disposed between the movable mounting plate 823 and the first ejector plate 841. When the second ejector plate 851 moves forward and backward, the first ejector plate 841 and the second ejector plate 851 move forward and backward together.

[0042] A through hole 851a is formed on the second ejector plate 851, which passes through the second ejector plate 851 in the mold opening and closing direction. The diameter of the through hole 851a is larger than the diameter of the first ejector rod 211 and smaller than the diameter of the second ejector rod 212. The first ejector rod 211 passes through the through hole 851a, and the second ejector rod 212 does not pass through the through hole 851a.

[0043] The second ejector pin 852 is disposed so as to be able to move forward and backward in a second pin hole penetrating the movable die plate 825 in the mold opening and closing direction. The front end surface of the second ejector pin 852 abuts against the first molded product 21 or the second molded product 22 .

[0044] In addition, in the present embodiment, the first fixed molding surface 811 and the second fixed molding surface 812 are formed in a concave shape, and the first movable molding surface 821 and the second movable molding surface 822 are formed in a convex shape, but the present invention is not limited thereto. That is, the first fixed molding surface 811 and the second fixed molding surface 812 may be formed in a convex shape, and the first movable molding surface 821 and the second movable molding surface 822 may be formed in a concave shape.

[0045] like Figure 1 and Figure 2 As shown, the mold clamping device 100 is, for example, a horizontal type, and its mold opening and closing direction is the horizontal direction. The mold clamping device 100 includes a fixed platen 110 for mounting the fixed mold 810, a rotating table 520 for mounting the movable mold 820, a movable platen 120 for rotatably mounting the rotating table 520, a rotating mechanism 530 for rotating the rotating table 520, and a moving mechanism 102 for moving the movable platen 120 relative to the fixed platen 110 in the mold opening and closing direction.

[0046] The fixed platen 110 is fixed to the mold clamping device frame 910. The fixed mold 810 is attached to the surface of the fixed platen 110 that faces the movable platen 120.

[0047] The movable platen 120 is configured to be movable relative to the mold clamping device frame 910 in the mold opening and closing direction. A guide 101 for guiding the movable platen 120 is laid on the mold clamping device frame 910. A rotating table 520 is installed on the surface of the movable platen 120 that is opposite to the fixed platen 110. Figure 3 to Figure 7 As shown, the movable platen 120 rotatably supports a rotating shaft 571 of the rotating table 520 via a bearing 572 .

[0048] The rotating table 520 is rotatably mounted on the movable platen 120. The rotation centerline 520X of the rotating table 520 is parallel to the mold opening and closing direction. Figure 7 As shown, the rotating table 520 includes a mold mounting portion 521, a disk portion 523 supporting the mold mounting portion 521 from behind, and a cylindrical portion 524 extending backward from the outer periphery of the disk portion 523. A movable mold 820 is mounted on the surface of the mold mounting portion 521 facing the fixed platen 110.

[0049] Rotating mechanism 530 (reference Figure 7 ) rotates the rotating table 520. The rotating mechanism 530 includes a rotating motor 531 and a transmission mechanism 532 for transmitting the rotational driving force of the rotating motor 531 to the rotating table 520. The transmission mechanism 532 is composed of, for example, a driving gear 533, an intermediate gear 534, and a driven gear 535. The driving gear 533 and the driven gear 535 may be connected to each other without providing the intermediate gear 534.

[0050] The rotating mechanism 530 rotates the rotating platform 520 to a first rotation angle and a second rotation angle. Figure 3 As shown, the first rotation angle is the rotation angle at which the first fixed molding surface 811 and the first movable molding surface 821 form the first cavity space 801 and the second fixed molding surface 812 and the second movable molding surface 822 form the second cavity space 802. The first rotation angle is, for example, 0°. On the other hand, Figure 5 As shown, the second rotation angle is a rotation angle at which the first fixed molding surface 811 and the second movable molding surface 822 form the first cavity space 801 and the second fixed molding surface 812 and the first movable molding surface 821 form the second cavity space 802. The second rotation angle is, for example, 180°.

[0051] Each time the rotating table 520 rotates 180°, the rotating direction of the rotating table 520 can be reversed. For example, the rotating mechanism 530 rotates the rotating table 520 180° clockwise and then rotates the rotating table 520 180° counterclockwise. Since the arrangement of the wiring and piping fixed to the rotating table 520 is restored to the original state, the handling of the wiring and piping is easy.

[0052] like Figure 3 As shown, if the mold is closed when the rotation angle of the rotary table 520 is the first rotation angle, the first fixed molding surface 811 and the first movable molding surface 821 form the first cavity space 801, and the second fixed molding surface 812 and the second movable molding surface 822 form the second cavity space 802. The molding material is supplied from the first injection device 301 to the first cavity space 801 to mold the first molded product 21. Next, the mold is opened.

[0053] Then, if Figure 4As shown, the first ejector 201 ejects the first waste product 23 from the movable mold 820. The first waste product 23 and the first molded product 21 are solidified inside the mold device 800. At this time, the first molded product 21 is not ejected from the movable mold 820. Next, the rotating mechanism 530 rotates the rotating table 520 180 degrees. At this time, the first molded product 21 rotates 180 degrees together with the movable mold 820. Then, as shown in FIG. Figure 5 As shown, the mold is closed.

[0054] like Figure 5 As shown, if the mold is closed when the rotation angle of the rotating table 520 is the second rotation angle, the first fixed molding surface 811 and the second movable molding surface 822 form the first cavity space 801, and the second fixed molding surface 812 and the first movable molding surface 821 form the second cavity space 802. The first molded product 21 is arranged in a part of the second cavity space 802. The molding material is supplied from the second injection device 302 to the remaining part of the second cavity space 802 to mold the second molded product 22. The second molded product 22 is described as a molded product including the first molded product 21. The first molded product 21 is molded in parallel with the molding of the second molded product 22. The first molded product 21 is molded in the first cavity space 801. Next, the mold is opened.

[0055] Then, if Figure 6 As shown, the second ejector 202 ejects both the second molded product 22 and the second waste product 24 from the movable mold 820. The second waste product 24 is solidified together with the second molded product 22 inside the mold device 800. After being ejected from the movable mold 820, the second waste product 24 is separated from the second molded product 22. The first waste product 23 is ejected in parallel with the ejection of the second molded product 22 and the second waste product 24. Then, the mold is opened, and the rotating table 520 is rotated 180 degrees again.

[0056] like Figure 3 and Figure 5 As shown, the movable platen 120 mainly comprises: a front surface plate 121, which supports the rotating table 520 so that it can rotate freely; an intermediate block 124, which is arranged on the radial inner side of the cylindrical portion 524 of the rotating table 520; a rear block 126, which is arranged behind the intermediate block 124; and a toggle rod mounting portion 128 (refer to Figure 7 ), which is arranged on the rear end surface of the rear block 126. The front surface plate 121, the intermediate block 124, the rear block 126 and the toggle rod mounting portion 128 may be formed separately and connected, or may be formed integrally by casting or the like.

[0057] The front surface plate 121 supports the rotating table 520 so as to be rotatable. The front surface plate 121 is provided with a first rod hole 122 penetrating the front surface plate 121 in the mold opening and closing direction. The first ejector rod 211 is arranged in the first rod hole 122 so as to be able to move forward and backward. Furthermore, the front surface plate 121 is provided with a second rod hole 123 penetrating the front surface plate 121 in the mold opening and closing direction. The second ejector rod 212 is arranged in the second rod hole 123 so as to be able to move forward and backward.

[0058] The intermediate block 124 is arranged radially inside the cylindrical portion 524 of the rotating table 520. When viewed from the mold opening and closing direction, the intermediate block 124 has, for example, a cylindrical shape accommodated inside the cylindrical portion 524 of the rotating table 520. A space for arranging the first ejection device 201 and a space for arranging the second ejection device 202 are formed inside the intermediate block 124. A front surface plate 121 is mounted on the front end surface of the intermediate block 124. An insertion hole 127 is formed on the front surface plate 121 and the intermediate block 124, into which the rotating shaft 571 of the rotating table 520 is inserted via a bearing 572.

[0059] The rear block 126 is disposed behind the intermediate block 124. The rear block 126 has a rectangular shape, for example. A space for disposing the first ejector 201 and a space for disposing the second ejector 202 are formed inside the rear block 126. The intermediate block 124 is mounted on the front end surface of the rear block 126.

[0060] Toggle lever mounting portion 128 (reference Figure 7 ) is provided on the rear end surface of the rear block 126 at intervals in the vertical direction. The pair of toggle rod mounting parts 128 are respectively provided with a plurality of toggle rod mounting plates with the plate thickness direction facing the horizontal direction at intervals in the horizontal direction. The plurality of toggle rod mounting plates protrude rearward from the rear end surface of the rear block 126, and have a pin hole 129 at the front end thereof. The pin is inserted through the pin hole 129, and the first connecting rod 152 (reference Figure 1 and Figure 2 ) is mounted on the toggle lever mounting portion 128 via a pin so as to be swingable.

[0061] Moving mechanism 102 (reference Figure 1 and Figure 2) The mold device 800 is closed, pressurized, clamped, depressurized, and opened by moving the movable platen 120 forward and backward relative to the fixed platen 110. The moving mechanism 102 comprises: a toggle seat 130, which is arranged with a gap between the fixed platen 110; a connecting rod 140, which connects the fixed platen 110 and the toggle seat 130; a toggle mechanism 150, which moves the movable platen 120 relative to the toggle seat 130 in the mold opening and closing direction; a clamping motor 160, which operates the toggle mechanism 150; a motion conversion mechanism 170, which converts the rotational motion of the clamping motor 160 into a linear motion; and a mold thickness adjustment mechanism 180, which adjusts the gap between the fixed platen 110 and the toggle seat 130.

[0062] The toggle seat 130 is arranged at a distance from the fixed platen 110 and is placed on the mold clamping device frame 910 so as to be movable in the mold opening and closing direction. In addition, the toggle seat 130 can be arranged so as to be movable along a guide member laid on the mold clamping device frame 910. The guide member of the toggle seat 130 can be common to the guide member 101 of the movable platen 120.

[0063] In addition, in the present embodiment, the fixed pressure plate 110 is fixed to the mold clamping device frame 910, and the elbow seat 130 is configured to be freely movable relative to the mold clamping device frame 910 in the mold opening and closing direction, but the elbow seat 130 may also be fixed to the mold clamping device frame 910, and the fixed pressure plate 110 may be configured to be freely movable relative to the mold clamping device frame 910 in the mold opening and closing direction.

[0064] The connecting rod 140 connects the fixed platen 110 and the toggle seat 130 at a distance L in the mold opening and closing direction. A plurality of connecting rods 140 (for example, four) may be used. The plurality of connecting rods 140 are arranged parallel to the mold opening and closing direction and extend according to the mold clamping force. A connecting rod strain detector 141 for detecting the strain of the connecting rod 140 may be provided on at least one of the connecting rods 140. The connecting rod strain detector 141 sends a signal indicating its detection result to the control device 700. The detection result of the connecting rod strain detector 141 is used for detecting the mold clamping force, etc.

[0065] In addition, in this embodiment, the tie rod strain detector 141 is used as the mold clamping force detector for detecting the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain type, and can also be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, etc., and its installation position is not limited to the tie rod 140.

[0066] The toggle mechanism 150 is disposed between the movable platen 120 and the toggle seat 130, and moves the movable platen 120 in the mold opening and closing direction relative to the toggle seat 130. The toggle mechanism 150 includes a crosshead 151 that moves in the mold opening and closing direction and a pair of link groups that are bent and extended by the movement of the crosshead 151. The pair of link groups each includes a first link 152 and a second link 153 that are connected by pins or the like so as to be able to be bent and extended. The first link 152 is mounted by pins or the like so as to be able to swing freely relative to the movable platen 120. The second link 153 is mounted by pins or the like so as to be able to swing freely relative to the toggle seat 130. The second link 153 is mounted to the crosshead 151 via the third link 154. When the crosshead 151 is moved forward and backward relative to the toggle seat 130, the first link 152 and the second link 153 are bent and extended, and the movable platen 120 is moved forward and backward relative to the toggle seat 130.

[0067] In addition, the structure of the toggle mechanism 150 is not limited to Figure 1 and Figure 2 For example, in Figure 1 and Figure 2 In the embodiment, the number of nodes of each link group is five, but may be four, or one end of the third link 154 may be connected to a node between the first link 152 and the second link 153 .

[0068] The mold clamping motor 160 is mounted on the toggle base 130 to operate the toggle mechanism 150. The mold clamping motor 160 causes the cross head 151 to move forward and backward relative to the toggle base 130 to bend and extend the first link 152 and the second link 153, thereby causing the movable platen 120 to move forward and backward relative to the toggle base 130. The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may also be connected to the motion conversion mechanism 170 via a belt, a pulley, or the like.

[0069] The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into the linear motion of the cross head 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may exist between the screw shaft and the screw nut.

[0070] The mold clamping device 100, under the control of the control device 700, performs a mold closing process, a pressure increasing process, a mold clamping process, a pressure relief process, a mold opening process, and a mold rotation process. The mold rotation process is performed after the mold opening process is completed and before the next mold closing process begins. In the present embodiment, the mold rotation process is performed after the ejection process is completed, but it may also be performed before the ejection process is completed. For example, when the molding position of the second molded product 22 is different from the ejection position of the second molded product 22, the mold rotation process is performed after the mold opening process is completed, and then the ejection process is performed. Specifically, for example, when the molding position of the second molded product 22 is the operating side and the ejection position of the second molded product 22 is the opposite side of the operating side, the mold rotation process is performed after the mold opening process is completed, and then the ejection process is performed.

[0071] In the mold closing process, the mold clamping motor 160 is driven to move the crosshead 151 to the mold closing completion position at a set moving speed to move the movable platen 120 forward, thereby bringing the movable mold 820 into contact with the fixed mold 810. For example, the position and moving speed of the crosshead 151 are detected using a mold clamping motor encoder 161. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700.

[0072] In addition, the crosshead position detector for detecting the position of the crosshead 151 and the crosshead moving speed detector for detecting the moving speed of the crosshead 151 are not limited to the mold clamping motor encoder 161, and a general detector can be used. In addition, 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 mold clamping motor encoder 161, and a general detector can be used.

[0073] In the pressure increasing step, the mold clamping motor 160 is further driven to further advance the cross head 151 from the mold closing completion position to the mold clamping position, thereby generating a mold clamping force.

[0074] In the mold clamping process, the mold clamping motor 160 is driven to maintain the position of the cross head 151 at the mold clamping position. In the mold clamping process, the mold clamping force generated in the pressurization process is maintained. In the mold clamping process, a first cavity space 801 and a second cavity space 802 are formed in the mold device 800.

[0075] In the pressure release process, the mold clamping motor 160 is driven to retract the crosshead 151 from the mold clamping position to the mold opening start position to retract the movable platen 120, thereby reducing the mold clamping force. The mold opening start position and the mold closing completion position may be the same position.

[0076] In the mold opening process, the mold clamping motor 160 is driven to retract the crosshead 151 from the mold opening start position to the mold opening completion position at a set moving speed to retract the movable platen 120 , thereby separating the movable mold 820 from the fixed mold 810 .

[0077] The ejection process is performed after the mold opening process is completed and before the next mold closing process is started. In the ejection process, the first ejection device 201 ejects the first waste product 23 from the movable mold 820. The first molded product 21 solidified together with the first waste product 23 is not ejected. In addition, in the ejection process, the second ejection device 202 ejects both the second molded product 22 and the second waste product 24 from the movable mold 820. The mold rotation process is performed after the ejection process is completed and before the next mold closing process is started.

[0078] In the mold rotating step, the rotating table 520 is rotated to rotate the first molded product 21 together with the movable mold 820. Then, the first molded product 21 is arranged in a part of the second cavity space 802 by performing the mold closing step and the pressure increasing step.

[0079] The setting conditions in the mold closing process, the pressure increasing process and the mold clamping process are set together as a series of setting conditions. For example, the moving speed, position (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 of the crosshead 151 in the mold closing process and the pressure increasing process 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 sequence from the back to the front, and indicate the starting point and end point of the interval for setting the moving speed. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position can also be not set. Only one of the mold clamping position and the mold clamping force can be set.

[0080] The setting conditions in the pressure relief process and the mold opening process are also set in the same way. For example, the moving speed and position (mold opening start position, moving speed switching position and mold opening completion position) of the crosshead 151 in the pressure relief process and the mold opening process are set together as a series of setting conditions. The mold opening start position, the moving speed switching position and the mold opening completion position are arranged in sequence from the front to the back, and represent the starting point and end point of the interval for setting the moving speed. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position can also be not set. The mold opening start position and the mold closing completion position can be the same position. In addition, the mold opening completion position and the mold closing start position can be the same position.

[0081] Alternatively, the moving speed and position of the movable platen 120 may be set instead of the moving speed and position of the crosshead 151. Furthermore, the mold clamping force may be set instead of the position of the crosshead (eg, mold clamping position) and the position of the movable platen.

[0082] However, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. The amplification factor is also called the toggle magnification. The toggle magnification changes according to the angle θ (hereinafter also referred to as "link angle θ") formed by the first link 152 and the second link 153. The link angle θ is calculated according to the position of the crosshead 151. When the link angle θ is 180°, the toggle magnification is maximum.

[0083] When the thickness of the mold device 800 changes due to replacement of the mold device 800 or temperature change of the mold device 800, mold thickness adjustment is performed to obtain a predetermined mold clamping force when the mold is clamped. In the mold thickness adjustment, for example, the interval L between the fixed platen 110 and the toggle seat 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time of mold contact between the movable mold 820 and the fixed mold 810.

[0084] 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 interval L between the fixed platen 110 and the toggle seat 130. In addition, the mold thickness adjustment is performed, for example, during the period from the end of the molding cycle to 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 connecting rod 140; a screw nut 182 that is held on the toggle seat 130 so as to be rotatable and unable to move forward and backward; and a mold thickness adjustment motor 183 that rotates the screw nut 182 that is threaded with the screw shaft 181.

[0085] A lead screw shaft 181 and a lead screw nut 182 are provided for each connecting rod 140. The rotational driving force of the mold thickness adjustment motor 183 can be transmitted to the plurality of lead screw nuts 182 via the rotational driving force transmission unit 185. The plurality of lead screw nuts 182 can be rotated synchronously. In addition, the plurality of lead screw nuts 182 can be rotated individually by changing the transmission path of the rotational driving force transmission unit 185.

[0086] The rotational driving force transmission part 185 is composed of, for example, gears. In this case, a driven gear is formed on the outer periphery of each lead screw nut 182, a driving gear is mounted on the output shaft of the mold thickness adjustment motor 183, and an intermediate gear meshing with the plurality of driven gears and the driving gear is held rotatably at the center of the toggle seat 130. In addition, the rotational driving force transmission part 185 may be composed of a belt, a pulley, etc. instead of a gear.

[0087] 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 lead screw nut 182. As a result, the position of the toggle seat 130 relative to the connecting rod 140 is adjusted, and the interval L between the fixed platen 110 and the toggle seat 130 is adjusted. In addition, a plurality of mold thickness adjustment mechanisms may be used in combination.

[0088] The mold thickness adjustment motor encoder 184 is used to detect the interval L. The mold thickness adjustment motor encoder 184 detects the rotation amount and rotation direction 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 to monitor and control the position of the toggle seat 130 and the interval L. In addition, the toggle seat position detector for detecting the position of the toggle seat 130 and the interval detector for detecting the interval L are not limited to the mold thickness adjustment motor encoder 184, and a common detector can be used.

[0089] The mold clamping device 100 may include a mold temperature regulator for regulating the temperature of the mold device 800. The mold device 800 includes a flow path of a temperature regulating medium therein. The mold temperature regulator regulates the temperature of the mold device 800 by regulating the temperature of the temperature regulating medium supplied to the flow path of the mold device 800.

[0090] Furthermore, the mold clamping device 100 of the present embodiment is a horizontal type in which the mold opening and closing direction is the horizontal direction, but may be a vertical type in which the mold opening and closing direction is the vertical direction.

[0091] The mold clamping device 100 of this embodiment includes the mold clamping motor 160 as a driving unit, but may include a hydraulic cylinder instead of the mold clamping motor 160. Furthermore, the mold clamping device 100 may include a linear motor for mold opening and closing, and may include an electromagnet for mold clamping.

[0092] (1st ejector device and 2nd ejector device)

[0093] In the description of the first ejection device 201 and the second ejection 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 direction of the X-axis) is set to the front, and the moving direction of the movable platen 120 when the mold is opened (for example, the negative direction of the X-axis) is set to the rear.

[0094] The first ejector 201 and the second ejector 202 are mounted on the movable platen 120 and move forward and backward together with the movable platen 120. The first ejector 201 ejects the first waste product 23 from the movable mold 820. At this time, the first ejector 201 does not eject the first molded product 21 solidified together with the first waste product 23. The second ejector 202 ejects both the second molded product 22 and the second waste product 24 from the movable mold 820.

[0095] The first ejector 201 and the second ejector 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 201 are arranged on the operation side. And, the second cavity space 802 and the second ejector 202 are arranged on the side opposite to the operation side. Thus, the second molded product 22 can be taken out to the side opposite to the operation side.

[0096] Next, the main reference Figure 4 The first ejector device 201 and its operation are described. The first ejector device 201 has a first ejector rod 211 that pushes only the first movable part 840 of the first movable part 840 and the second movable part 850. The first ejector rod 211 is not connected to the first movable part 840. The first ejector rod 211 can be pulled out from the rotating table 520, and the rotating table 520 can be rotated.

[0097] The first ejection device 201 has a first drive mechanism 220 that advances and retreats the first ejection rod 211. The first drive mechanism 220 has, for example, a first ejection motor 221, a first crosshead 223, and a first motion conversion mechanism 225 that converts the rotational motion of the first ejection motor 221 into the linear motion of the first crosshead 223.

[0098] The first motion conversion mechanism 225 includes a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may exist between the screw shaft and the screw nut. The first crosshead 223 moves in the mold opening and closing direction along the first guide rod 224. The rear end of the first ejector rod 211 is mounted on the first crosshead 223, and the first ejector rod 211 moves forward and backward together with the first crosshead 223.

[0099] like Figure 4 As shown in FIG. 1 , when the first driving mechanism 220 advances the first ejector rod 211, the first ejector rod 211 passes through the through hole 823a of the movable mounting plate 823 and the through hole 851a of the second ejector plate 851, and pushes the first ejector plate 841 forward. As a result, the first ejector plate 841 advances against the force of the first return spring 843. Therefore, the first ejector pin 842 advances, and the first scrap 23 is ejected from the fixing portion 830.

[0100] like Figure 4 As shown, while the first ejector plate 841 is advanced by the first driving mechanism 220 and the first ejector rod 211, the second ejector plate 851 is stopped at the retreat limit position by the force of the second return spring 853 and does not advance. Therefore, when the first scrap 23 is ejected from the fixing portion 830, the first molded product 21 is not ejected from the fixing portion 830.

[0101] Then, when the first driving mechanism 220 moves the first ejector rod 211 backward, the first ejector plate 841 moves backward to the backward limit position due to the force of the first return spring 843. When the first ejector plate 841 reaches the backward limit position, the front end surface of the first ejector pin 842 and the front end surface of the fixing portion 830 are on the same plane.

[0102] The control device 700 controls the position of the first ejector rod 211 when the first ejector rod 211 is moved forward and backward. The position of the first ejector rod 211 is detected using, for example, the first ejector motor encoder 222. The first ejector motor encoder 222 detects the rotation of the first ejector motor 221 and sends a signal indicating the detection result to the control device 700. In addition, the first ejector rod position detector that detects the position of the first ejector rod 211 is not limited to the first ejector motor encoder 222, and a general detector can be used.

[0103] Next, the main reference Figure 6 The second ejector device 202 and its operation are described. The second ejector device 202 includes a second ejector rod 212 that pushes the first movable portion 840 and the second movable portion 850. The second ejector rod 212 is not connected to the first movable portion 840 and the second movable portion 850. The second ejector rod 212 can be pulled out from the rotating table 520, and the rotating table 520 can be rotated.

[0104] The second ejection device 202 has a second drive mechanism 230 that advances and retreats the second ejection rod 212. The second drive mechanism 230 has, for example, a second ejection motor 231, a second crosshead 233, and a second motion conversion mechanism 235 that converts the rotational motion of the second ejection motor 231 into the linear motion of the second crosshead 233.

[0105] The second motion conversion mechanism 235 includes a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may exist between the screw shaft and the screw nut. The second crosshead 233 moves in the mold opening and closing direction along the second guide rod 234. The rear end of the second ejector rod 212 is mounted on the second crosshead 233, and the second ejector rod 212 moves forward and backward together with the second crosshead 233.

[0106] like Figure 6 As shown in FIG. 1 , if the second driving mechanism 230 moves the second ejector rod 212 forward, the second ejector rod 212 passes through the through hole 823a of the movable mounting plate 823 and pushes the edge of the through hole 851a of the second ejector plate 851 forward. As a result, the second ejector plate 851 moves forward against the force of the second return spring 853. Therefore, the second ejector pin 852 moves forward and ejects the second molded product 22 from the fixed portion 830.

[0107] While the second driving mechanism 230 and the second ejection rod 212 advance the second ejection plate 851, the first ejection plate 841 advances against the biasing force of the first return spring 843. Therefore, the first ejection pin 842 advances to eject the second scrap 24 from the fixing portion 830.

[0108] Then, when the second driving mechanism 230 moves the second ejector rod 212 backward, the second ejector plate 851 moves backward to the backward limit position due to the force of the second return spring 853. When the second ejector plate 851 reaches the backward limit position, the front end surface of the second ejector pin 852 and the front end surface of the fixing portion 830 are on the same plane.

[0109] While the second ejector plate 851 is retreating, the first ejector plate 841 retreats to the retreat limit position due to the biasing force of the first return spring 843. When the first ejector plate 841 reaches the retreat limit position, the front end surface of the first ejector pin 842 and the front end surface of the fixing portion 830 are on the same plane.

[0110] The control device 700 controls the position of the second ejector rod 212 when the second ejector rod 212 is moved forward and backward. The position of the second ejector rod 212 is detected using, for example, the second ejector motor encoder 232. The second ejector motor encoder 232 detects the rotation of the second ejector motor 231 and sends a signal indicating the detection result to the control device 700. In addition, the second ejector rod position detector that detects the position of the second ejector rod 212 is not limited to the second ejector motor encoder 232, and a general detector can be used.

[0111] (First injection device and second injection device)

[0112] In the description of the first injection device 301 and the second injection device 302, unlike the description of the mold clamping device 100, etc., the moving direction of the screw 330 during filling (for example, the negative direction of the X-axis) is set to the front, and the moving direction of the screw 330 during metering (for example, the positive direction of the X-axis) is set to the rear for description.

[0113] The first injection device 301 is provided on the first slide base 303, and the first slide base 303 is configured to be able to move forward and backward relative to the injection device frame 920. The first injection device 301 is configured to be able to move forward and backward relative to the mold device 800. The first injection device 301 contacts the mold device 800 and injects the molding material into the interior of the mold device 800, thereby filling the first cavity space 801 with the molding material.

[0114] The second injection device 302 is provided on the second slide base, and the second slide base is configured to be able to move forward and backward relative to the injection device frame 920. The second injection device 302 is configured to be able to move forward and backward relative to the mold device 800. The second injection device 302 contacts the mold device 800 and injects the molding material into the interior of the mold device 800, thereby filling the second cavity space 802 with the molding material.

[0115] 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 in the first cavity space 801 by the first injection device 301 and the molding material filled in the second cavity space 802 by the second injection device 302 can be different materials or the same material.

[0116] The first injection device 301 and the second injection device 302 are configured in the same manner. Therefore, the configuration of the first injection device 301 will be described below, and the configuration of the second injection device 302 will be omitted.

[0117] like Figure 1 and Figure 2 As shown, the first injection device 301, for example, has a cylinder 310 for heating a molding material, a nozzle 320 provided at the front end of the cylinder 310, a screw 330 configured to rotate freely and move forward and backward in the cylinder 310, a metering motor 340 for rotating the screw 330, an injection motor 350 for moving the screw 330 forward and backward, and a load detector 360 for detecting a load transmitted between the injection motor 350 and the screw 330.

[0118] The cylinder 310 heats the molding material supplied from the supply port 311. The molding material includes, for example, resin. The molding material is formed into, for example, granules and 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 periphery of the rear of the cylinder 310. A heater 313 such as a belt heater and a temperature detector 314 are provided on the periphery of the cylinder 310 in front of the cooler 312.

[0119] The cylinder 310 is divided into a plurality of regions along the axial direction (e.g., the X-axis direction) of the cylinder 310. Heaters 313 and temperature detectors 314 are respectively provided in the plurality of regions. Set temperatures are respectively set for the plurality of regions, and the control device 700 controls the heater 313 so that the detected temperature of the temperature detector 314 becomes the set temperature.

[0120] The nozzle 320 is provided at the front end of the cylinder 310 and is pressed against the mold device 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes a set temperature.

[0121] The screw 330 is configured to be able to rotate freely and to move forward and backward freely in the cylinder 310. When the screw 330 is rotated, the molding material is transported forward along the spiral groove of the screw 330. While the molding material is transported forward, it is gradually melted by the heat from the cylinder 310. As the liquid molding material is transported forward to the front of the screw 330 and accumulated 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 filled in the mold device 800.

[0122] A check ring 331 is installed at the front of the screw 330 so as to be able to move forward and backward. The check ring 331 serves as a check valve to prevent the molding material from flowing backward from the front to the rear of the screw 330 when the screw 330 is pushed forward.

[0123] When the screw 330 is advanced, the check ring 331 is pushed backward by the pressure of the molding material in front of the screw 330, and thus retreats relatively to the screw 330 to a closed position that blocks the flow path of the molding material (see FIG. Figure 2 ). Thus, the molding material accumulated in front of the screw 330 is prevented from flowing backward.

[0124] On the other hand, when the screw 330 is rotated, the check ring 331 is pushed forward by the pressure of the molding material conveyed to the front along the spiral groove of the screw 330, and moves forward relative to the screw 330 to an open position (refer to Figure 1 ). As a result, the molding material is transported to the front of the screw 330.

[0125] The check ring 331 may be either a co-rotating type that rotates together with the screw 330 or a non-co-rotating type that does not rotate together with the screw 330 .

[0126] In addition, the first injection device 301 may include a driving source for moving the check ring 331 forward and backward relative to the screw 330 between the open position and the closed position.

[0127] The metering motor 340 rotates the screw 330. The driving source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump or the like.

[0128] The injection motor 350 moves the screw 330 forward and backward. A motion conversion mechanism that converts the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided between the injection motor 350 and the screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed with the screw shaft. Balls and rollers may be provided between the screw shaft and the screw nut. The driving source that moves the screw 330 forward and backward is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

[0129] 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 on the transmission path of the load between the injection motor 350 and the screw 330, and detects the load acting on the load detector 360.

[0130] 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 a pressure acting between the screw 330 and the molding material, and is used to control and monitor the pressure on the screw 330 from the molding material, the back pressure on the screw 330, and the pressure acting on the molding material from the screw 330.

[0131] In addition, the pressure detector for detecting the pressure of the molding material is not limited to the load detector 360, and a common detector can be used. For example, a nozzle pressure sensor or a mold internal pressure sensor can be used. The nozzle pressure sensor is provided at the nozzle 320. The mold internal pressure sensor is provided inside the mold device 800.

[0132] 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 can be collectively referred to as an injection process.

[0133] In the metering process, the metering motor 340 is driven to rotate the screw 330 at a set speed, so that the molding material is transported to the front along the spiral groove of the screw 330. As a result, the molding material is gradually melted. As the liquid molding material is transported to the front of the screw 330 and accumulated in the front part of the cylinder 310, the screw 330 is retracted. For example, the rotation speed of the screw 330 is detected using a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340 and sends a signal indicating its detection result to the control device 700. In addition, the screw speed detector that detects the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a common detector can be used.

[0134] In order to prevent the screw 330 from retreating rapidly during the metering process, the injection motor 350 may be driven to apply a set back pressure to the screw 330. For example, the back pressure on the screw 330 is detected using 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.

[0135] The position and speed of the screw 330 in the metering process are set together as a series of setting conditions. For example, the metering start position, the speed switching position and the metering completion position are set. These positions are arranged in sequence from the front to the back, and represent the starting point and the end point of the interval for setting the speed. The speed is set for each interval. The speed switching position can be one or more. The speed switching position can also be not set. In addition, the back pressure is set for each interval.

[0136] In the filling process, the injection motor 350 is driven to make the screw 330 move forward 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. For example, the position and moving speed of the screw 330 are detected using the injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350 and sends a signal indicating its detection result to the control device 700. If the position of the screw 330 reaches the set position, a switch is made from the filling process to the pressure holding process (so-called V / P switching). The position where the V / P switching is performed is also referred to as the V / P switching position. The set moving speed of the screw 330 can be changed according to the position and time of the screw 330, etc.

[0137] The position and moving speed of the screw 330 in the filling process are set as a series of setting conditions. For example, the filling start position (also called the "injection start position"), the moving speed switching position and the V / P switching position are set. These positions are arranged in sequence from the back to the front, and represent the starting point and the end point of the interval for setting the moving speed. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position can also be not set.

[0138] The upper limit value of the pressure of the screw 330 is set for each interval of the moving speed of the screw 330. 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 moves forward at the set moving speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, the screw 330 moves forward at a moving speed slower than the set moving speed for the purpose of protecting the mold so that the pressure of the screw 330 becomes below the set pressure.

[0139] In addition, in the filling process, after the position of the screw 330 reaches the V / P switching position, the screw 330 may be temporarily stopped at the V / P switching position, and then the V / P switching may be performed. Alternatively, the screw 330 may be moved forward or backward at a slow speed instead of stopping the screw 330 just before the V / P switching. Furthermore, 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 a common detector may be used.

[0140] In the pressure holding process, the injection motor 350 is driven to push the screw 330 forward, the pressure of the molding material at the front end of the screw 330 (hereinafter also referred to as "holding pressure") is maintained at the set pressure, and the molding material remaining in the cylinder 310 is pushed toward the mold device 800. The insufficient amount of molding material caused by the cooling shrinkage in the mold device 800 can be supplemented. For example, the holding pressure is detected using a load detector 360. The setting value of the holding pressure can be changed according to the elapsed time from the start of the pressure holding process. The holding pressure and the holding time of the holding pressure in the pressure holding process can be set separately in multiples, or can be set together as a series of setting conditions.

[0141] During the pressure holding process, the molding material in the first cavity space 801 in the mold device 800 is gradually cooled, and when the pressure holding process is completed, the entrance 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 pressure holding process, the cooling process begins. During the cooling process, the molding material in the first cavity space 801 is solidified. In order to shorten the molding cycle time, a metering process can be performed during the cooling process.

[0142] In addition, the first injection device 301 of the present embodiment is a coaxial screw type, but it can also be a screw pre-plasticization type. The injection device of the pre-plasticization 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, the screw is configured to be able to rotate freely and cannot move forward or backward, or the screw is configured to be able to rotate freely and move forward and backward freely. On the other hand, in the injection cylinder, the plunger is configured to move forward and backward freely.

[0143] Furthermore, the first injection device 301 of the present embodiment is a horizontal type in which the axial direction of the cylinder body 310 is in the horizontal direction, but it may be a vertical type in which the axial direction of the cylinder body 310 is in the up-down direction. The mold clamping device combined with the vertical first injection device 301 may be a vertical type or a horizontal type. Similarly, the mold clamping device combined with the horizontal first injection device 301 may be a horizontal type or a vertical type.

[0144] (First moving device and second moving device)

[0145] 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 direction of the X-axis) is set to the front, and the moving direction of the screw 330 during metering (for example, the positive direction of the X-axis) is set to the rear.

[0146] The first moving device 401 moves the first injection device 301 forward and backward relative to the mold device 800. In addition, the first moving device 401 presses the nozzle 320 of the first injection device 301 against the mold device 800 to generate nozzle contact pressure.

[0147] The second moving device moves the second injection device 302 forward and backward relative to the mold device 800. In addition, the second moving device presses the nozzle of the second injection device 302 against the mold device 800 to generate nozzle contact pressure.

[0148] The first moving device 401 and the second moving device are arranged with a gap in the Y-axis direction. The first moving device 401 and the second moving device independently advance and retract the first injection device 301 and the second injection device 302 .

[0149] The first moving device 401 and the second moving device are constructed in the same manner. Therefore, the structure of the first moving device 401 will be described below, and the structure of the second moving device will be omitted. Figure 1 and Figure 2 As shown, the first moving device 401 includes a hydraulic pump 410, a motor 420 as a driving source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

[0150] The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a bidirectionally rotatable pump, and generates hydraulic pressure by sucking working fluid (e.g., oil) from one of the first port 411 and the second port 412 and discharging it from the other port by switching the rotation direction of the motor 420. Alternatively, the hydraulic pump 410 can also suck working fluid from a tank and discharge the working fluid from one of the first port 411 and the second port 412.

[0151] The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 with a rotation direction and torque corresponding to a control signal from the control device 700. The motor 420 may be an electric motor or an electric servomotor.

[0152] The hydraulic cylinder 430 includes 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 interior 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.

[0153] The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via the first flow path 413. The working fluid discharged from the first port 411 is supplied to the front chamber 435 via the first flow path 413, thereby pushing the first injection device 301 forward. The first injection device 301 moves forward 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 a nozzle contact pressure of the nozzle 320 by the pressure of the working fluid supplied from the hydraulic pump 410.

[0154] On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via the second flow path 414. The working fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 via the second flow path 414, thereby pushing the first injection device 301 backward. The first injection device 301 retreats and the nozzle 320 of the first injection device 301 is separated from the fixed mold 810.

[0155] 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.

[0156] (Control device)

[0157] The control device 700 is constituted by a computer, for example. Figure 1-2 As shown, the control device 700 has a CPU (Central Processing Unit) 701, a storage medium such as a memory 702, an input interface 703, and an output interface 704. The control device 700 performs various controls by causing the CPU 701 to execute a program stored in the storage medium 702. In addition, the control device 700 receives signals from the outside through the input interface 703 and sends signals to the outside through the output interface 704.

[0158] The control device 700 repeatedly manufactures the first molded product 21 and the second molded product 22 by repeatedly performing the metering process, the mold closing process, the pressure increasing process, the mold clamping process, the filling process, the pressure holding process, the cooling process, the pressure releasing process, the mold opening process, the ejection process, and the mold rotating process. A series of actions for obtaining the first molded product 21 and the second molded product 22, for example, the actions from the start of the metering process to the start of the next metering process, are also referred to as "injection" or "molding cycle". In addition, the time required for one injection is also referred to as "molding cycle time" or "cycle time".

[0159] A molding cycle includes, for example, a metering process, a mold closing process, a pressure increasing process, a mold closing process, a filling process, a pressure holding process, a cooling process, a pressure relief process, a mold opening process, an ejection process, and a mold rotation process. The order here is the order in which each process starts. The filling process, the pressure holding process, and the cooling process are performed during the mold closing process. The start of the mold closing process can coincide with the start of the filling process. The end of the pressure relief process coincides with the start of the mold opening process.

[0160] In addition, in order to shorten the molding cycle time, multiple processes can be performed simultaneously. For example, the metering process can be performed during the cooling process of the previous molding cycle, or during the mold closing process. In this case, the mold closing process can be performed at the beginning of the molding cycle. In addition, the filling process can be started during the mold closing process. In addition, the ejection process can be started during the mold opening process. When an on-off valve for opening and closing the flow path of the nozzle 320 is provided, the mold opening process can be started during the metering process. This is because, even if the mold opening process is started during the metering process, as long as the on-off valve closes the flow path of the nozzle 320, the molding material will not leak from the nozzle 320.

[0161] In addition, a molding cycle may include processes other than metering process, mold closing process, pressure increasing process, mold clamping process, filling process, pressure holding process, cooling process, pressure relief process, mold opening process, ejection process and mold rotation process.

[0162] For example, after the pressure holding process is completed and before the metering process is started, a pre-metering suction process can be performed to retract the screw 330 to a preset metering start position. The pressure of the molding material accumulated in front of the screw 330 can be reduced before the metering process starts, and the screw 330 can be prevented from retreating sharply when the metering process starts.

[0163] Furthermore, after the metering process is completed and before the filling process is started, a post-metering backsucking process may be performed in which the screw 330 is retracted to a preset filling start position (also referred to as an "injection start position"). The pressure of the molding material accumulated in front of the screw 330 can be reduced before the filling process starts, and leakage of the molding material from the nozzle 320 before the filling process starts can be prevented.

[0164] The control device 700 is connected to an operation device 750 that receives input operations from a user and a display device 760 that displays a screen. The operation device 750 and the display device 760 may be formed of, 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, for example, information such as the settings of the injection molding machine 10 and the current state of the injection molding machine 10 may be displayed. In addition, on the screen of the touch panel 770, for example, operation parts such as buttons and input fields that receive input operations from a user may also be displayed. The touch panel 770 as the operation device 750 detects the input operation of the user on the screen and outputs a signal corresponding to the input operation to the control device 700. Thus, for example, the user can operate the operation part set on the screen while confirming the information displayed on the screen to perform settings of the injection molding machine 10 (including input of a set value). In addition, by the user operating the operation part set on the screen, the injection molding machine 10 corresponding to the operation part can be operated. In addition, the operation of the injection molding machine 10 may be, for example, the operation (including stopping) 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, and the second moving device (not shown). Furthermore, the operation of the injection molding machine 10 may be switching of the screen displayed on the touch panel 770 as the display device 760.

[0165] In addition, the operating device 750 and the display device 760 of this embodiment are described as being integrated into the touch panel 770, but they may be provided independently. In addition, a plurality of operating devices 750 may be provided. The operating device 750 and the display device 760 are arranged on the operating side (Y-axis negative direction) of the mold clamping device 100 (more specifically, the fixed platen 110).

[0166] Next, refer to Figure 8 , the time-dependent changes of the actual values ​​of the first filling pressure P1, the second filling pressure P2 and the clamping force F are described. The first filling pressure P1 is the pressure for filling the first cavity space 801 with molding material. The second filling pressure P2 is the pressure for filling the second cavity space 802 with molding material. A pressure detector for detecting the actual value of the first filling pressure P1 and a pressure detector for detecting the actual value of the second filling pressure P2 are respectively provided. In the present embodiment, the pressure detector is a mold internal pressure sensor, but may also be a nozzle pressure sensor or a load detector 360. In the present embodiment, the clamping force detector for detecting the actual value of the clamping force F is a connecting rod strain detector 141, but is not particularly limited.

[0167] When the first injection device 301 starts injection, the actual value of the first filling pressure P1 gradually rises and reaches a maximum. The timing when the first injection device 301 starts injection is sometimes recorded as the first injection start timing t1a. Also, the timing when the actual value of the first filling pressure P1 reaches a maximum value is sometimes recorded as the first peak timing t1b.

[0168] When the second injection device 302 starts injection, the actual value of the second filling pressure P2 gradually rises and reaches the maximum. The timing when the second injection device 302 starts injection is sometimes recorded as the second injection start timing t2a. In addition, the timing when the actual value of the second filling pressure P2 reaches the maximum value is sometimes recorded as the second peak timing t2b.

[0169] like Figure 8 As shown in (A), if the first injection start timing t1a and the second injection start timing t2a are the same, the first peak timing t1b and the second peak timing t2b may be the same. The first filling pressure P1 and the second filling pressure P2 act in the direction of overcoming the clamping force and opening the fixed mold 810 and the movable mold 820. Therefore, if the first peak timing t1b and the second peak timing t2b are the same, the fixed mold 810 and the movable mold 820 may be opened. If the opening amount is too large, burrs will be generated. Burrs are a phenomenon in which the molding material leaks between the fixed mold 810 and the movable mold 820 and solidifies.

[0170] After the mold clamping process starts, the actual value of the mold clamping force F is stable until the molding material reaches the parting surface between the fixed mold 810 and the movable mold 820. Then, if the fixed mold 810 and the movable mold 820 are opened, the opening amount is equal to the elongation amount of the connecting rod 140, and the actual value of the mold clamping force F increases according to the elongation amount. Therefore, the increase range ΔF represents the opening amount of the fixed mold 810 and the movable mold 820 in the mold clamping process. The larger the opening amount, the larger the increase range ΔF.

[0171] like Figure 8 As shown in (B), the control device 700 of this embodiment provides an interval between the first injection start timing t1a and the second injection start timing t2a, thereby providing an interval between the first peak timing t1b and the second peak timing t2b. The interval between t1a and t2a and the interval between t1b and t2b are determined so that the increase range ΔF of the actual value of the mold clamping force F becomes less than the upper limit value. The upper limit value of the increase range ΔF is determined so that burrs are not generated.

[0172] Separating a gap between t1b and t2b includes controlling the setting of the gap between t1b and t2b. The setting of the gap between t1b and t2b may include at least one of the gap between t1b and t2b, t1b itself, and t2b itself. The control may be performed in a manner of separating the gaps by setting the gap between t1b and t2b, t1b, or t2b, but the gap between t1b and t2b, t1b, or t2b may also be set in a manner of not directly setting these but setting the action timing or forward speed of the screw to obtain the result of the action according to the setting. As an example of the setting of the gap between t1b and t2b, the setting of the gap between t1a and t2a may be used.

[0173] The setting of the interval between t1b and t2b preferably includes at least one of the interval between t1a and t2a, t1a itself, and t2a itself. However, it may be not t1a or t2a itself, but the actual value of the filling pressure P1 or P2 at which the first injection device 301 or the second injection device 302 starts injection. t1a and t2a are mechanical action timings, so they can be directly set. In addition, the setting of the interval between t1b and t2b, t1b or t2b may be the forward speed of the screw 330 of at least one of the first injection device 301 and the second injection device 302. The slower the forward speed of the screw 330, the slower t1b or t2b. As long as the control of separating the interval between t1b and t1b can be performed, other control including the interval, timing, or action condition related to t1a, t2a, t1b, or t2b can be adopted.

[0174] As described above, the control device 700 provides an interval between the first injection start timing t1a and the second injection start timing t2a, thereby providing an interval between the first peak timing t1b and the second peak timing t2b. This can prevent the amount of opening between the fixed mold 810 and the movable mold 820 in the mold clamping process from being excessive, and can prevent the generation of burrs. In addition, the mold clamping motor 160 can be miniaturized.

[0175] In addition, the interval between t1a and t2a and the interval between t1b and t2b can be determined so that the increase range ΔF of the actual value of the mold clamping force F becomes less than the upper limit value. In addition, if ΔF is too low, the risk of gas burning increases, so a lower limit value can be set in ΔF to prevent gas burning from occurring. Gas burning refers to the phenomenon that the gas in the first cavity space 801 or the second cavity space 802 is compressed and generates heat due to the molding material flowing into the first cavity space 801 or the second cavity space 802, thereby carbonizing the molding material. By setting the lower limit value, the gas discharge path can be ensured, thereby suppressing the occurrence of gas burning.

[0176] Furthermore, the order of t1a and t2a is not limited. Which of t1a and t2a is prioritized may be a structure input by the user, or may be a structure automatically set by the control device 700 by acquiring information related to the first molded product 21 and the second molded product 22 (for example, the type of resin or the cooling time). Of the first molded product 21 and the second molded product 22, it is preferred that the injection start timing of the molded product with a long cooling time is first. If the injection start timing of the molded product with a long cooling time is first, the molding cycle time is shorter than when the order of the injection start timing is reversed.

[0177] The control device 700 can obtain the interval between the first injection start timing t1a and the second injection start timing t2a based on the actual value of the mold clamping force F. The control device 700 repeatedly performs the molding cycle while changing the interval between t1a and t2a, and obtains the interval between t1a and t2a at which the increase range ΔF of the actual value of the mold clamping force F becomes less than the upper limit value. At this time, the actual values ​​of the first filling pressure P1 and the second filling pressure P2 may not be considered.

[0178] The control device 700 can obtain the interval between the first injection start timing t1a and the second injection start timing t2a based on the actual values ​​of the first filling pressure P1 and the second filling pressure P2. The control device 700 repeatedly performs the molding cycle while changing the interval between t1a and t2a, and obtains the interval between t1a and t2a at which the total value of P1 and P2 becomes less than the upper limit value. At this time, the actual value of the mold clamping force F may not be considered.

[0179] Alternatively, the control device 700 may determine the interval between the first injection start timing t1a and the second injection start timing t2a based on the actual value of only one of the first filling pressure P1 and the second filling pressure P2. The control device 700 may determine the timing to start the other injection based on the actual value of the filling pressure increased by the injection after starting the injection of only one of the first injection device 301 and the second injection device 302. Specifically, the interval between t1a and t2a is determined so that the other injection is started after the actual value of the filling pressure reaches the maximum value due to the start of one injection.

[0180] The control device 700 may obtain the interval between t1a and t2a based on the actual value of at least one of the mold clamping force F, the first filling pressure P1, and the second filling pressure P2, and then repeatedly implement the molding cycle using the obtained interval between t1a and t2a, or may notify that the interval between t1a and t2a should be changed. The control device 700 may repeatedly implement the molding cycle using the obtained interval between t1a and t2a when detecting that a predetermined operation is performed by the user after the notification.

[0181] The control device 700 can monitor the increase range ΔF of the actual value of the mold clamping force F, and when the increase range ΔF exceeds the upper limit value, control of notifying an alarm is performed. The control device 700 controls the notification alarm by controlling an image display device, a warning light, a buzzer, etc. Furthermore, when the increase range ΔF is lower than the lower limit value, in addition to the control of notifying the alarm of the upper limit value, the control device 700 can also additionally control the notification alarm. The upper limit value and the lower limit value can be a structure input by the user, or the control device 700 can automatically set it by obtaining information related to the first molded product 21 and the second molded product 22 (for example, whether it is molded or not).

[0182] The control device 700 can monitor whether the filling process is delayed after starting injection of only one of the first injection device 301 and the second injection device 302. In the filling process, the screw 330 is moved forward at a set moving speed, but if the pressure of the screw 330 exceeds the set pressure, the screw 330 is moved forward at a speed slower than the set moving speed for the purpose of protecting the mold. As a result, the filling process may be delayed. When the delay of the filling process is detected, the control device 700 can lengthen the interval between t1a and t2a, or notify that the interval between t1a and t2a should be lengthened.

[0183] Instead of setting the interval between t1a and t2a, the subsequent timing (e.g., t2a) of t1a and t2a may be controlled independently of the preceding timing (e.g., t1a). Hereinafter, a case where t1a precedes t2a, that is, the first injection device 301 starts injection earlier than the second injection device 302, will be described as a representative example. In addition, t2a may precede t1a. That is, the second injection device 302 may start injection earlier than the first injection device 301. Setting the interval between t1a and t2a includes determining the interval, finding the interval, changing the interval, or lengthening the interval.

[0184] When the first injection device 301 starts injection before the second injection device 302, t2a may be set based on the completion time of the filling process of the first injection device 301. t2a may be set at the completion time of the filling process of the first injection device 301, or may be set a predetermined time earlier than the completion time, or may be set a predetermined time later than the completion time. Instead of the completion time of the filling process, the completion time of the pressure holding process may be used as the reference.

[0185] Furthermore, when the first injection unit 301 starts injection earlier than the second injection unit 302, t2a may be set when the first filling pressure P1 satisfies a predetermined condition. Alternatively, when the first injection unit 301 starts injection earlier than the second injection unit 302, t2a may be set when the mold clamping force satisfies a predetermined condition.

[0186] In addition, when the first injection device 301 starts injection before the second injection device 302, the control device 700 may accept a user's selection as to whether t2a is set in the filling process of the first injection device 301 or in the pressure holding process of the first injection device 301. The control device 700 accepts the user's selection on the screen of the touch panel 770, for example.

[0187] In addition, the mold device 800 may have a third cavity space not shown in the figure in addition to the first cavity space 801 and the second cavity space 802. The injection molding machine 10 may have a third injection device not shown in the figure in addition to the first injection device 301 and the second injection device 302. The third injection device contacts the mold device 800 and injects molding material into the interior of the mold device 800, thereby filling the third cavity space with the molding material. The pressure of filling the third cavity space with molding material is sometimes recorded as the third filling pressure P3. The timing when the actual value of the third filling pressure P3 reaches the maximum value is sometimes recorded as the third peak timing t3b. The timing when the third injection device starts injection is sometimes recorded as the third injection start timing t3a.

[0188] At this time, it is preferred that the control device 700 separates t1a, t2a and t3a from each other, thereby separating t1b, t2b and t3b from each other. However, it is sufficient to separate any two selected from t1a, t2a and t3a. For example, if t1a is different from t2a, t3a can be the same as t1a or t2a. In addition, a space can be separated between any two selected from t1b, t2b and t3b. For example, if t1b is different from t2b, t3b can be the same as t1b or t2b. In addition, the mold device 800 may also have a fourth cavity space not shown in the figure, and the injection molding machine 10 may also have a fourth injection device not shown in the figure.

[0189] Furthermore, in the present embodiment, the movable mold 820 is mounted on the rotating table 520 and rotates together with the rotating table 520, but the technology of the present invention is not limited thereto. The rotating table 520 may be omitted, and the movable mold 820 may be fixed to the movable platen 120. Alternatively, the movable mold 820 may be mounted so as to be able to slide relative to the movable platen 120 in a direction orthogonal to the mold opening and closing direction. As long as the mold device 800 has the first cavity space 801 and the second cavity space 802, and the injection molding machine 10 has the first injection device 301 and the second injection device 302.

[0190] Next, refer to Fig. 9, the mold device 800 involved in the modification example is described. Below, the differences from the above-mentioned embodiment are mainly described. The content of the above-mentioned embodiment can be applied to this modification example. In addition to the fixed mold 810 and the movable mold 820, the mold device 800 also has a hot runner 880. The hot runner 880 has: a heater 881, which heats the flow path of the molding material; a first valve 882, which opens and closes the entrance of the first cavity space 801; and a second valve 883, which opens and closes the entrance of the second cavity space 802.

[0191] The first valve 882 is an example of a first opening and closing portion. The first opening and closing portion opens and closes the first cavity space 801 relative to the injection port 809 of the molding material in the mold device 800. The position of the first opening and closing portion is not particularly limited. If the injection device 300 injects the molding material into the mold device 800 and the first opening and closing portion opens the flow path of the molding material, the molding material flows into the first cavity space 801.

[0192] The second valve 883 is an example of a second opening and closing portion. The second opening and closing portion opens and closes the second cavity space 802 relative to the injection port 809 of the molding material in the mold device 800. The position of the second opening and closing portion is not particularly limited. When the injection device 300 injects the molding material into the mold device 800 and the second opening and closing portion opens the flow path of the molding material, the molding material flows into the second cavity space 802.

[0193] Figure 8 The temporal changes of the actual values ​​of the first filling pressure P1, the second filling pressure P2, and the mold clamping force F shown are also effective in the mold device 800 of this modification. However, in this modification, t1a is the first opening timing for opening the first valve 882, and t2a is the second opening timing for opening the second valve 883. In addition, t1b is the first peak timing when the actual value of the first filling pressure P1 reaches the maximum value, and t2b is the second peak timing when the actual value of the second filling pressure P2 reaches the maximum value.

[0194] like Figure 8 As shown in (A), if the first opening timing t1a and the second opening timing t2a are the same, the first peak timing t1b and the second peak timing t2b may be the same. As a result, the fixed mold 810 and the movable mold 820 may be opened. If the opening amount is too large, burrs will be generated.

[0195] like Figure 8As shown in (B), the control device 700 of this embodiment provides an interval between the first open timing t1a and the second open timing t2a, thereby providing an interval between the first peak timing t1b and the second peak timing t2b. The interval between t1a and t2a and the interval between t1b and t2b are determined so that the increase range ΔF of the actual value of the mold clamping force F becomes less than the upper limit value. The upper limit value of the increase range ΔF is determined so that burrs are not generated.

[0196] As described above, the control device 700 provides an interval between the first opening timing t1a and the second opening timing t2a, thereby providing an interval between the first peak timing t1b and the second peak timing t2b. This can prevent the amount of opening between the fixed mold 810 and the movable mold 820 in the mold clamping process from being excessive, and can prevent the generation of burrs. In addition, the mold clamping motor 160 can be miniaturized.

[0197] In addition, the interval between t1a and t2a and the interval between t1b and t2b can be determined so that the increase range ΔF of the actual value of the mold clamping force F becomes less than the upper limit value. In addition, if ΔF is too low, the risk of gas burning increases, so a lower limit value can be set in addition to ΔF so that gas burning does not occur. By setting the lower limit value, the gas discharge path can be ensured, and the occurrence of gas burning can be suppressed.

[0198] The priority of t1a and t2a may be input by the user or automatically set by the control device 700 by acquiring information related to the first molded product 21 and the second molded product 22 (such as the type of resin or the cooling time).

[0199] The control device 700 can obtain the setting of the interval between the first opening timing t1a and the second opening timing t2a based on the actual value of the mold clamping force F. The control device 700 repeatedly performs the molding cycle while changing the setting of the interval between t1a and t2a, and obtains the setting of the interval between t1a and t2a so that the increase range ΔF of the actual value of the mold clamping force F becomes less than the upper limit value. At this time, the actual values ​​of the first filling pressure P1 and the second filling pressure P2 may not be considered.

[0200] The control device 700 can determine the setting of the interval between the first opening timing t1a and the second opening timing t2a based on the actual values ​​of the first filling pressure P1 and the second filling pressure P2. The control device 700 repeatedly performs the molding cycle while changing the setting of the interval between t1a and t2a, and determines the setting of the interval between t1a and t2a so that the total value of P1 and P2 becomes less than the upper limit value. At this time, the actual value of the mold clamping force F may not be considered.

[0201] Alternatively, the control device 700 may determine the setting of the interval between the first opening timing t1a and the second opening timing t2a based on the actual value of only one of the first filling pressure P1 and the second filling pressure P2. The control device 700 may determine the timing to open the other valve based on the actual value of the filling pressure increased by the opening after only one of the first valve 882 and the second valve 883 is opened. Specifically, the setting of the interval between t1a and t2a is determined so that the other valve is opened after the actual value of the filling pressure reaches the maximum value due to the opening of one valve.

[0202] The control device 700 may obtain a setting for separating the interval t1a and t2a based on at least one actual value of the mold clamping force F, the first filling pressure P1, and the second filling pressure P2, and then repeatedly perform the molding cycle using the obtained setting, or may notify that the setting should be changed. If it is detected that a predetermined operation is performed by the user after the notification, the control device 700 may repeatedly perform the molding cycle using the obtained setting.

[0203] In addition, the mold device 800 may have a third cavity space not shown in the figure, and may have a third opening and closing portion not shown in the figure, in addition to the first cavity space 801 and the second cavity space 802. The third opening and closing portion opens and closes the third cavity space relative to the injection port 809 of the molding material in the mold device 800. Sometimes the timing when the actual value of the third filling pressure P3 reaches the maximum value is recorded as the third peak timing t3b. Sometimes the timing when the third opening and closing portion opens the flow path of the molding material is recorded as the third opening timing t3a.

[0204] At this time, it is preferred that the control device 700 separates t1a, t2a and t3a from each other, thereby separating t1b, t2b and t3b from each other. However, it is sufficient to separate any two selected from t1a, t2a and t3a. For example, if t1a is different from t2a, t3a can be the same as t1a or t2a. In addition, a space can be separated between any two selected from t1b, t2b and t3b. For example, if t1b is different from t2b, t3b can be the same as t1b or t2b. In addition, the mold device 800 may also have a fourth cavity space not shown in the figure, and may also have a fourth opening and closing part not shown in the figure.

[0205] Furthermore, in this embodiment, the mold device 800 has a hot runner 880, but it is not necessary to have the hot runner 880. As long as the mold device 800 has the first cavity space 801 and the second cavity space 802, and the mold device 800 has the first opening and closing part and the second opening and closing part, the content of this modification can also be applied to the molding mold described in Patent Document 2.

[0206] The above describes the embodiments of the control device of the injection molding machine, the injection molding machine, and the control method of the injection molding machine involved in the present invention, but the present invention is not limited to the above embodiments, etc. Various changes, corrections, replacements, additions, deletions, and combinations can be made within the scope of the technical solution. Of course, these also fall within the technical scope of the present invention.

Claims

1. A control device for an injection molding machine, which, when a mold device having a fixed mold and a movable mold is molded, fills a molding material into a first cavity space and a second cavity space respectively formed between the fixed mold and the movable mold, During mold clamping, an interval is provided between a first peak timing when a filling pressure of the molding material into the first cavity space reaches a maximum value and a second peak timing when a filling pressure of the molding material into the second cavity space reaches a maximum value.

2. The control device for an injection molding machine according to claim 1, wherein: The control device of the injection molding machine performs the following processing: A first injection device for injecting molding material into the interior of the mold device fills the first cavity space with molding material; A second injection device that injects the molding material into the interior of the mold device fills the second cavity space with the molding material; and By providing an interval between the first injection start timing at which the first injection device starts injecting the molding material and the second injection start timing at which the second injection device starts injecting the molding material, an interval is provided between the first peak timing and the second peak timing.

3. The control device for an injection molding machine according to claim 2, wherein: Based on at least one actual value of the mold clamping force and the filling pressure, an interval between the first injection start timing and the second injection start timing is obtained.

4. The control device for an injection molding machine according to claim 1, wherein: The control device of the injection molding machine performs the following processing: Controlling a first opening and closing portion for opening and closing the first cavity space relative to an injection port of a molding material in the mold device; Controlling a second opening and closing portion for opening and closing the second cavity space relative to an injection port of a molding material in the mold device; and By providing an interval between the first opening timing for opening the first opening and closing portion and the second opening timing for opening the second opening and closing portion, an interval is provided between the first peak timing and the second peak timing.

5. The control device for an injection molding machine according to claim 4, wherein: The interval between the first open timing and the second open timing is obtained based on at least one actual value of the mold clamping force and the filling pressure. 6 . An injection molding machine comprising the control device according to claim 1 .

7. A control method for an injection molding machine, wherein when a mold device having a fixed mold and a movable mold is molded, a first cavity space and a second cavity space respectively formed between the fixed mold and the movable mold are filled with molding material, During mold clamping, an interval is provided between a first peak timing when a filling pressure of the molding material into the first cavity space reaches a maximum value and a second peak timing when a filling pressure of the molding material into the second cavity space reaches a maximum value.

Images