WO2022210988A1 - 射出成形機の監視装置 - Google Patents
射出成形機の監視装置 Download PDFInfo
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- WO2022210988A1 WO2022210988A1 PCT/JP2022/016332 JP2022016332W WO2022210988A1 WO 2022210988 A1 WO2022210988 A1 WO 2022210988A1 JP 2022016332 W JP2022016332 W JP 2022016332W WO 2022210988 A1 WO2022210988 A1 WO 2022210988A1
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- mold
- link
- screw
- mold clamping
- motor
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 35
- 238000012806 monitoring device Methods 0.000 title claims abstract description 11
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/7653—Measuring, controlling or regulating mould clamping forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/66—Mould opening, closing or clamping devices mechanical
- B29C45/661—Mould opening, closing or clamping devices mechanical using a toggle mechanism for mould clamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/768—Detecting defective moulding conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/84—Safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76083—Position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76177—Location of measurement
- B29C2945/76224—Closure or clamping unit
- B29C2945/7623—Closure or clamping unit clamping or closing drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76344—Phase or stage of measurement
- B29C2945/76391—Mould clamping, compression of the cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76451—Measurement means
- B29C2945/76481—Strain gauges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76929—Controlling method
- B29C2945/76939—Using stored or historical data sets
- B29C2945/76943—Using stored or historical data sets compare with thresholds
Definitions
- the present invention relates to a monitoring device for an injection molding machine.
- a mold device is composed of a fixed mold and a movable mold.
- a movable mold is attached to a movable platen, and a mold supporting device is arranged so as to be movable in a mold opening/closing direction.
- a toggle mechanism for moving the movable platen in the mold opening/closing direction is composed of a plurality of link members. Since the plurality of link members also move with the movement of the movable platen in the mold opening/closing direction, the connecting portions of the link members wear.
- One aspect of the present invention provides a technology for easily detecting wear by performing detection based on the amount of change that occurs in the link member when pressure is released to reduce the mold clamping force.
- a monitoring device for an injection molding machine includes an acquisition unit that acquires an amount of change occurring in a link member based on a detection value in a depressurization process from a detection unit provided in the link member of the toggle mechanism. and a determination unit that determines whether or not the amount of change acquired by the acquisition unit exceeds a predetermined threshold.
- wear of the link member is easily detected by performing detection based on the amount of change that has occurred in the link member.
- FIG. 1 is a diagram showing a state of the injection molding machine according to the first embodiment when mold opening is completed.
- FIG. 2 is a diagram showing a state of the injection molding machine according to the first embodiment at the time of mold clamping.
- FIG. 3 is a configuration diagram of a toggle mechanism included in the injection molding machine according to the first embodiment.
- FIG. 4 is a diagram illustrating a configuration example of a control device according to the first embodiment;
- FIG. 5 is a diagram showing forces generated within the toggle mechanism in the depressurization process according to the first embodiment.
- FIG. 6 is a perspective view showing the shape of the second link according to the first embodiment;
- FIG. 7 is a front view showing the shape of the second link according to the first embodiment;
- FIG. 8 is a diagram exemplifying a change in strain amount acquired by the acquisition unit in the depressurization process of the first embodiment.
- FIG. 9 is a flowchart showing a procedure of a process for determining whether or not wear has occurred by the control device according to the first embodiment.
- FIG. 10 is a diagram exemplifying a change in acceleration acquired by the acquisition unit in the depressurization step of the first embodiment.
- FIG. 11 is a flowchart showing the procedure of a process for determining whether or not wear has occurred by the control device according to the first embodiment.
- FIG. 1 is a diagram showing the state of the injection molding machine according to the first embodiment when mold opening is completed.
- FIG. 2 is a diagram showing a state of the injection molding machine according to the first embodiment at the time of mold clamping.
- the X-axis direction, Y-axis direction and Z-axis direction are directions perpendicular to each other.
- the X-axis direction and Y-axis direction represent the horizontal direction, and the Z-axis direction represents the vertical direction.
- the X-axis direction is the mold opening/closing direction
- the Y-axis direction is the width direction of the injection molding machine 10 .
- the Y-axis direction negative side is called the operating side
- the Y-axis direction positive side is called the non-operating side.
- the injection molding machine 10 includes a mold clamping device 100 that opens and closes a mold device 800, an ejector device 200 that ejects a molded product molded by the mold device 800, and the mold device 800.
- a moving device 400 for moving the injection device 300 forward and backward with respect to the mold device 800;
- a control device 700 for controlling each component of the injection molding machine 10;
- a frame 900 that supports the components.
- the frame 900 includes a mold clamping device frame 910 that supports the mold clamping device 100 and an injection device frame 920 that supports the injection device 300 .
- the mold clamping device frame 910 and the injection device frame 920 are each installed on the floor 2 via leveling adjusters 930 .
- a control device 700 is arranged in the inner space of the injection device frame 920 . Each component of the injection molding machine 10 will be described below.
- the moving direction of the movable platen 120 when the mold is closed (for example, the X-axis positive direction) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened is defined as the rear (for example, the X-axis negative direction). do.
- the mold clamping device 100 performs mold closing, pressure increase, mold clamping, depressurization, and mold opening of the mold device 800 .
- Mold apparatus 800 includes a fixed mold 810 and a movable mold 820 .
- the mold clamping device 100 is, for example, a horizontal type, and the mold opening/closing direction is horizontal.
- the mold clamping device 100 includes a stationary platen 110 to which a stationary mold 810 is attached, a movable platen 120 to which a movable mold 820 is attached, a moving mechanism 102 that moves the movable platen 120 in the mold opening/closing direction with respect to the stationary platen 110, have
- the fixed platen 110 is fixed to the mold clamping device frame 910 .
- a stationary mold 810 is attached to the surface of the stationary platen 110 facing the movable platen 120 .
- the movable platen 120 is arranged movably in the mold opening/closing direction with respect to the mold clamping device frame 910 .
- a guide 101 for guiding the movable platen 120 is laid on the mold clamping device frame 910 .
- a movable die 820 is attached to the surface of the movable platen 120 facing the fixed platen 110 .
- the moving mechanism 102 moves the movable platen 120 back and forth with respect to the fixed platen 110 to perform mold closing, pressure increase, mold clamping, pressure release, and mold opening of the mold device 800 .
- the moving mechanism 102 includes a toggle support 130 spaced apart from the stationary platen 110 , tie bars 140 connecting the stationary platen 110 and the toggle support 130 , and moving the movable platen 120 relative to the toggle support 130 in the mold opening/closing direction.
- a toggle mechanism 150 that operates the toggle mechanism 150
- a mold clamping motor 160 that operates the toggle mechanism 150
- a motion conversion mechanism 170 that converts the rotary motion of the mold clamping motor 160 into a linear motion
- a mold that adjusts the interval between the stationary platen 110 and the toggle support 130.
- a thickness adjustment mechanism 180 .
- the toggle support 130 is spaced apart from the fixed platen 110 and mounted on the mold clamping device frame 910 so as to be movable in the mold opening/closing direction.
- the toggle support 130 may be arranged so as to be movable along a guide laid on the mold clamping device frame 910 .
- the guides of the toggle support 130 may be common with the guides 101 of the movable platen 120 .
- the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle support 130 is arranged to be movable in the mold opening/closing direction with respect to the mold clamping device frame 910.
- the stationary platen 110 may be arranged to be movable relative to the mold clamping device frame 910 in the mold opening/closing direction.
- the tie bar 140 connects the stationary platen 110 and the toggle support 130 with a gap L in the mold opening/closing direction.
- a plurality of (for example, four) tie bars 140 may be used.
- the multiple tie bars 140 are arranged parallel to the mold opening/closing direction and extend according to the mold clamping force.
- At least one tie bar 140 may be provided with a tie bar strain detector 141 that detects strain of the tie bar 140 .
- Tie-bar distortion detector 141 sends a signal indicating the detection result to control device 700 .
- the detection result of the tie bar strain detector 141 is used for detection of mold clamping force and the like.
- the tie bar strain detector 141 is used as a mold clamping force detector that detects the mold clamping force, but the present invention is not limited to this.
- the mold clamping force detector is not limited to the strain gauge type, but may be of piezoelectric type, capacitive type, hydraulic type, electromagnetic type, etc., and its mounting position is not limited to the tie bar 140 either.
- the toggle mechanism 150 connects the movable platen 120 (an example of the first platen) and the stationary platen 110 (second platen) for opening and closing the mold of the mold apparatus 800, and the toggle support 130 is connected to the movable platen 120. is placed between The toggle mechanism 150 also moves the movable platen 120 (an example of a first platen) relative to the toggle support 130 in the mold opening/closing direction.
- the toggle mechanism 150 has a crosshead 151 that moves in the mold opening/closing direction, and a pair of link groups that bend and stretch as the crosshead 151 moves.
- a pair of link groups each has a first link 152 and a second link 153 that are connected by a pin or the like so as to be bendable and stretchable.
- the first link 152 is swingably attached to the movable platen 120 with a pin or the like.
- the second link 153 is swingably attached to the toggle support 130 with a pin or the like.
- a second link 153 is attached to the crosshead 151 via a third link 154 .
- the configuration of the toggle mechanism 150 is not limited to the configurations shown in FIGS. 1 and 2.
- the number of nodes in each link group is five, but the number may be four, and one end of the third link 154 is coupled to the node between the first link 152 and the second link 153. may be
- the mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150 .
- the mold clamping motor 160 advances and retreats the crosshead 151 with respect to the toggle support 130 , thereby bending and stretching the first link 152 and the second link 153 to advance and retreat the movable platen 120 with respect to the toggle support 130 .
- the mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, pulley, or the like.
- the motion conversion mechanism 170 converts rotary motion of the mold clamping motor 160 into linear motion of the crosshead 151 .
- the motion conversion mechanism 170 includes a threaded shaft and a threaded nut that screws onto the threaded shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.
- the mold clamping device 100 Under the control of the control device 700, the mold clamping device 100 performs a mold closing process, a pressure increasing process, a mold clamping process, a depressurizing process, a mold opening process, and the like.
- the mold clamping motor 160 is driven to advance the crosshead 151 to the mold closing completion position at the set movement speed, thereby advancing the movable platen 120 and bringing the movable mold 820 into contact with the fixed mold 810. .
- the position and moving speed of the crosshead 151 are detected using, for example, a mold clamping motor encoder 161 or the like.
- the mold clamping motor encoder 161 detects rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700 .
- the crosshead position detector for detecting the position of the crosshead 151 and the crosshead movement speed detector for detecting the movement speed of the crosshead 151 are not limited to the mold clamping motor encoder 161, and general ones are used. can. Further, the movable platen position detector 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 general ones are used. can.
- the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position, thereby generating mold clamping force.
- the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position.
- the mold clamping force generated in the pressurizing process is maintained.
- a cavity space 801 (see FIG. 2) is formed between the movable mold 820 and the fixed mold 810, and the injection device 300 fills the cavity space 801 with a liquid molding material.
- a molded product is obtained by solidifying the filled molding material.
- the number of cavity spaces 801 may be one or plural. In the latter case, multiple moldings are obtained simultaneously.
- the insert material may be arranged in part of the cavity space 801 and the other part of the cavity space 801 may be filled with the molding material.
- a molded product in which the insert material and the molding material are integrated is obtained.
- the mold clamping motor 160 is driven to retract the crosshead 151 from the mold clamping position to the mold opening start position, thereby retracting the movable platen 120 and reducing the mold clamping force.
- the mold opening start position and the mold closing completion position may be the same position.
- 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, thereby retracting the movable platen 120 and moving the movable mold 820 to the fixed metal. away from the mold 810; After that, the ejector device 200 ejects the molded product from the movable mold 820 .
- the setting conditions in the mold closing process, pressure rising process, and mold clamping process are collectively set as a series of setting conditions.
- the moving speed and position of the crosshead 151 including the mold closing start position, the moving speed switching position, the mold closing completion position, and the mold clamping position
- the mold clamping force in the mold closing process and the pressurizing process are set as a series of setting conditions.
- the mold closing start position, the movement speed switching position, the mold closing completion position, and the mold clamping position are arranged in this order from the rear side to the front side, and represent the start point and end point of the section in which the movement speed is set.
- a moving speed is set for each section.
- the moving speed switching position may be one or plural.
- the moving speed switching position does not have to be set. Only one of the mold clamping position and the mold clamping force may be set.
- the setting conditions in the depressurization process and the mold opening process are set in the same way.
- the moving speed and position of the crosshead 151 (mold opening start position, moving speed switching position, and mold opening completion position) in the depressurizing process and the mold opening process are collectively set as a series of setting conditions.
- the mold opening start position, the movement speed switching position, and the mold opening completion position are arranged in this order from the front side to the rear side, and represent the start point and end point of the section for which the movement speed is set.
- a moving speed is set for each section.
- the moving speed switching position may be one or plural.
- the moving speed switching position does not have to be set.
- the mold opening start position and the mold closing completion position may be the same position. Also, the mold opening completion position and the mold closing start position may be the same position.
- the moving speed, position, etc. of the crosshead 151 the moving speed, position, etc. of the movable platen 120 may be set.
- the mold clamping force may be set instead of the position of the crosshead (for example, mold clamping position) or the position of the movable platen.
- 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 toggle factor.
- the toggle magnification changes according to the angle ⁇ formed between the first link 152 and the second link 153 (hereinafter also referred to as “link angle ⁇ ”).
- the link angle ⁇ is obtained from the position of the crosshead 151 .
- the toggle magnification becomes maximum.
- the mold thickness is adjusted so that a predetermined mold clamping force can be obtained during mold clamping.
- the distance L between the fixed platen 110 and the toggle support 130 is adjusted so that the link angle ⁇ of the toggle mechanism 150 becomes a predetermined angle when the movable mold 820 touches the fixed mold 810 . to adjust.
- the mold clamping device 100 has a mold thickness adjusting mechanism 180.
- the mold thickness adjustment mechanism 180 adjusts the mold thickness by adjusting the distance L between the stationary platen 110 and the toggle support 130 .
- the timing of mold thickness adjustment is, for example, between the end of a molding cycle and the start of the next molding cycle.
- the mold thickness adjusting mechanism 180 is, for example, a threaded shaft 181 formed at the rear end of the tie bar 140, a screw nut 182 held by the toggle support 130 so as to be rotatable and non-retractable, and screwed to the threaded shaft 181. and a mold thickness adjusting motor 183 that rotates the screw nut 182 .
- a threaded shaft 181 and a threaded nut 182 are provided for each tie bar 140 .
- the rotational driving force of the mold thickness adjusting motor 183 may be transmitted to the multiple screw nuts 182 via the rotational driving force transmission portion 185 .
- Multiple screw nuts 182 can be rotated synchronously. By changing the transmission path of the rotational driving force transmission portion 185, it is also possible to rotate the plurality of screw nuts 182 individually.
- the rotational driving force transmission section 185 is configured by, for example, gears.
- a driven gear is formed on the outer circumference of each screw nut 182
- a driving gear is attached to the output shaft of the mold thickness adjusting motor 183
- an intermediate gear that meshes with a plurality of driven gears and the driving gear is formed in the central portion of the toggle support 130. rotatably held.
- the rotational driving force transmission section 185 may be configured by a belt, a pulley, or the like instead of the gear.
- the operation of the mold thickness adjusting mechanism 180 is controlled by the control device 700.
- the control device 700 drives the mold thickness adjusting motor 183 to rotate the screw nut 182 .
- the position of toggle support 130 with respect to tie bar 140 is adjusted, and the distance L between stationary platen 110 and toggle support 130 is adjusted.
- a plurality of mold thickness adjusting mechanisms may be used in combination.
- the interval L is detected using the mold thickness adjustment motor encoder 184.
- the mold thickness adjusting motor encoder 184 detects the amount and direction of rotation of the mold thickness adjusting motor 183 and sends a signal indicating the detection result to the control device 700 .
- the detection result of the mold thickness adjustment motor encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130 .
- the toggle support position detector that detects the position of the toggle support 130 and the gap detector that detects the gap L are not limited to the mold thickness adjustment motor encoder 184, and general ones can be used.
- the mold clamping device 100 may have a mold temperature controller that adjusts the temperature of the mold device 800 .
- the mold device 800 has a flow path for a temperature control medium inside.
- the mold temperature controller adjusts the temperature of the mold device 800 by adjusting the temperature of the temperature control medium supplied to the flow path of the mold device 800 .
- the mold clamping device 100 of this embodiment is a horizontal type in which the mold opening/closing direction is horizontal, it may be a vertical type in which the mold opening/closing direction is a vertical direction.
- the mold clamping device 100 of this embodiment has the mold clamping motor 160 as a drive source, the mold clamping motor 160 may be replaced by a hydraulic cylinder. Further, the mold clamping device 100 may have a linear motor for mold opening and closing and an electromagnet for mold clamping.
- the moving direction of the movable platen 120 when the mold is closed (for example, the positive direction of the X axis) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened (for example, X-axis negative direction) will be described as the rear.
- the ejector device 200 is attached to the movable platen 120 and advances and retreats together with the movable platen 120 .
- the ejector device 200 has an ejector rod 210 that ejects a molded product from the mold device 800 and a drive mechanism 220 that moves the ejector rod 210 in the moving direction of the movable platen 120 (X-axis direction).
- the ejector rod 210 is disposed in a through hole of the movable platen 120 so that it can move back and forth.
- the front end of ejector rod 210 contacts ejector plate 826 of movable mold 820 .
- the front end of ejector rod 210 may or may not be connected to ejector plate 826 .
- the drive mechanism 220 has, for example, an ejector motor and a motion conversion mechanism that converts the rotary motion of the ejector motor into the linear motion of the ejector rod 210 .
- the motion conversion mechanism includes a threaded shaft and a threaded nut that screws onto the threaded shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.
- the ejector device 200 performs an ejecting process under the control of the control device 700 .
- the ejector plate 826 is moved forward by advancing the ejector rod 210 from the standby position to the ejecting position at a set moving speed to eject the molded product.
- the ejector motor is driven to retract the ejector rod 210 at the set movement speed, and the ejector plate 826 is retracted to the original standby position.
- the position and moving speed of the ejector rod 210 are detected using, for example, an ejector motor encoder.
- the ejector motor encoder detects rotation of the ejector motor and sends a signal indicating the detection result to the control device 700 .
- the ejector rod position detector for detecting the position of the ejector rod 210 and the ejector rod moving speed detector for detecting the moving speed of the ejector rod 210 are not limited to ejector motor encoders, and general ones can be used.
- the moving direction of the screw 330 during filling (for example, the negative direction of the X axis) is defined as the forward direction, and the moving direction of the screw 330 during metering is defined as the forward direction. (For example, the positive direction of the X-axis) will be described as the rear.
- the injection device 300 is installed on a slide base 301 , and the slide base 301 is arranged to move forward and backward relative to the injection device frame 920 .
- the injection device 300 is arranged to move back and forth with respect to the mold device 800 .
- the injection device 300 touches the mold device 800 and fills the cavity space 801 in the mold device 800 with the molding material.
- the injection device 300 includes, for example, a cylinder 310 that heats the molding material, a nozzle 320 that is provided at the front end of the cylinder 310, a screw 330 that is rotatably arranged in the cylinder 310 so that it can move back and forth, and a screw that rotates. , an injection motor 350 for advancing and retreating the screw 330 , and a load detector 360 for detecting the load transmitted between the injection motor 350 and the screw 330 .
- the cylinder 310 heats the molding material supplied inside from the supply port 311 .
- the molding material includes, for example, resin.
- the molding material is formed into, for example, a pellet shape and supplied to the supply port 311 in a solid state.
- a supply port 311 is formed in the rear portion of the cylinder 310 .
- a cooler 312 such as a water-cooled cylinder is provided on the outer circumference of the rear portion of the cylinder 310 .
- a heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 ahead of the cooler 312 .
- the cylinder 310 is divided into a plurality of zones in the axial direction of the cylinder 310 (for example, the X-axis direction).
- a heater 313 and a temperature detector 314 are provided in each of the plurality of zones.
- a set temperature is set for each of the plurality of zones, and the controller 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes the set temperature.
- the nozzle 320 is provided at the front end of the cylinder 310 and pressed against the mold device 800 .
- a heater 313 and a temperature detector 314 are provided around the nozzle 320 .
- the controller 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes the set temperature.
- the screw 330 is arranged in the cylinder 310 so as to be rotatable and advanceable.
- the molding material is sent forward along the helical groove of the screw 330 .
- the molding material is gradually melted by the heat from the cylinder 310 while being fed forward.
- the screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 . After that, 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 .
- a backflow prevention ring 331 is movably attached to the front of the screw 330 as a backflow prevention valve that prevents backflow of the molding material from the front to the rear of the screw 330 when the screw 330 is pushed forward.
- the anti-backflow ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 when the screw 330 is advanced, and is relatively to the screw 330 until it reaches a closed position (see FIG. 2) that blocks the flow path of the molding material. fall back. This prevents the molding material accumulated in front of the screw 330 from flowing backward.
- the anti-backflow ring 331 is pushed forward by the pressure of the molding material sent forward along the helical groove of the screw 330 when the screw 330 is rotated, and is in an open position where the flow path of the molding material is opened. (see FIG. 1) relative to the screw 330. Thereby, the molding material is sent forward of the screw 330 .
- the anti-backflow 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 .
- the injection device 300 may have a drive source that advances and retracts the backflow prevention ring 331 with respect to the screw 330 between the open position and the closed position.
- the metering motor 340 rotates the screw 330 .
- the drive source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.
- the injection motor 350 moves the screw 330 forward and backward. Between the injection motor 350 and the screw 330, a motion conversion mechanism or the like that converts the rotary motion of the injection motor 350 into the linear motion of the screw 330 is provided.
- the motion conversion mechanism has, for example, a screw shaft and a screw nut screwed onto the screw shaft. Balls, rollers, or the like may be provided between the screw shaft and the screw nut.
- the drive source for advancing and retreating the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.
- a load detector 360 detects the load transmitted between the injection motor 350 and the screw 330 .
- the detected load is converted into pressure by the control device 700 .
- the load detector 360 is provided in a load transmission path between the injection motor 350 and the screw 330 and detects the load acting on the load detector 360 .
- the load detector 360 sends a detected load signal to the control device 700 .
- the load detected by the load detector 360 is converted into the pressure acting between the screw 330 and the molding material, the pressure received by 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. Used for control and monitoring of pressure, etc.
- the pressure detector that detects the pressure of the molding material is not limited to the load detector 360, and a general one can be used.
- a nozzle pressure sensor or a mold internal pressure sensor may be used.
- a nozzle pressure sensor is installed at the nozzle 320 .
- the mold internal pressure sensor is installed inside the mold apparatus 800 .
- the injection device 300 Under the control of the control device 700, the injection device 300 performs a weighing process, a filling process, a holding pressure process, and the like.
- the filling process and the holding pressure process may collectively be called an injection process.
- the weighing motor 340 is driven to rotate the screw 330 at a set rotation speed, and the molding material is fed forward along the helical groove of the screw 330. Along with this, the molding material is gradually melted.
- the screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 .
- the rotation speed of the screw 330 is detected using a metering motor encoder 341, for example.
- Weighing motor encoder 341 detects the rotation of weighing motor 340 and sends a signal indicating the detection result to control device 700 .
- the screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the weighing motor encoder 341, and a general one can be used.
- the injection motor 350 may be driven to apply a set back pressure to the screw 330 in order to limit rapid retraction of the screw 330 .
- the back pressure on the screw 330 is detected using a load detector 360, for example.
- the metering process is completed when the screw 330 is retracted to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330 .
- the position and rotational speed of the screw 330 in the moving direction in the weighing process are collectively set as a series of setting conditions. For example, a weighing start position, rotation speed switching position, and weighing completion position are set. These positions are arranged in this order from the front side to the rear side, and represent the start point and end point of the section in which the rotational speed is set. A rotation speed is set for each section.
- the rotational speed switching position may be one or plural. The rotation speed switching position does not have to be set. Also, the back pressure is set for each section.
- the injection motor 350 is driven to advance the screw 330 at a set movement speed, and the liquid molding material accumulated in front of the screw 330 is filled into the cavity space 801 in the mold device 800 .
- the position and moving speed of the screw 330 are detected using an injection motor encoder 351, for example.
- the injection motor encoder 351 detects rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700 .
- V/P switching switching from the filling process to the holding pressure process
- the position at which V/P switching takes place is also called the V/P switching position.
- the set moving speed of the screw 330 may be changed according to the position of the screw 330, time, and the like.
- the position and movement speed of the screw 330 in the filling process are collectively set as a series of setting conditions.
- a filling start position also called an “injection start position”
- a moving speed switching position and a V/P switching position are set. These positions are arranged in this order from the rear side to the front side, and represent the start point and end point of the section for which the movement speed is set.
- a moving speed is set for each section.
- the moving speed switching position may be one or plural. The moving speed switching position does not have to be set.
- the upper limit value of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set.
- the pressure of screw 330 is detected by load detector 360 .
- the screw 330 is advanced at the set travel speed.
- the screw 330 exceeds the set pressure, the screw 330 is advanced at a moving speed slower than the set moving speed so that the pressure of the screw 330 is equal to or less than the set pressure for the purpose of mold protection.
- the screw 330 may be temporarily stopped at the V/P switching position, and then the V/P switching may be performed. Immediately before the V/P switching, instead of stopping the screw 330, the screw 330 may be slowly advanced or slowly retracted.
- the screw position detector for detecting the position of the screw 330 and the screw moving speed detector for detecting the moving speed of the screw 330 are not limited to the injection motor encoder 351, and general ones can be used.
- the injection motor 350 is driven to push the screw 330 forward, and 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.
- the remaining molding material is pushed toward the mold device 800 .
- a shortage of molding material due to cooling shrinkage in the mold apparatus 800 can be replenished.
- the holding pressure is detected using the load detector 360, for example.
- the set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure process.
- a plurality of holding pressures and holding times for holding the holding pressure in the holding pressure step may be set respectively, and may be collectively set as a series of setting conditions.
- the molding material in the cavity space 801 inside the mold device 800 is gradually cooled, and when the holding pressure process is completed, the entrance of the cavity space 801 is closed with the solidified molding material. This state is called a gate seal, and prevents the molding material from flowing back from the cavity space 801 .
- the cooling process is started. In the cooling process, the molding material inside the cavity space 801 is solidified. A metering step may be performed during the cooling step for the purpose of shortening the molding cycle time.
- the injection device 300 of the present embodiment is of the in-line screw method, it may be of the pre-plastic method or the like.
- a pre-plastic injection apparatus supplies molding material melted in a plasticizing cylinder to an injection cylinder, and injects the molding material from the injection cylinder into a mold apparatus.
- a screw is arranged to be rotatable and non-retractable, or a screw is arranged to be rotatable and reciprocal.
- a plunger is arranged in the injection cylinder so that it can move back and forth.
- the injection device 300 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is horizontal, but may be a vertical type in which the axial direction of the cylinder 310 is vertical.
- the mold clamping device combined with the vertical injection device 300 may be either vertical or horizontal.
- the mold clamping device combined with the horizontal injection device 300 may be horizontal or vertical.
- the moving direction of the screw 330 during filling (for example, the negative direction of the X-axis) is defined as forward, and the moving direction of the screw 330 during weighing (eg, the positive direction of the X-axis). is described as backward.
- the moving device 400 advances and retreats the injection device 300 with respect to the mold device 800 . Further, the moving device 400 presses the nozzle 320 against the mold device 800 to generate nozzle touch pressure.
- the moving device 400 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.
- the hydraulic pump 410 has a first port 411 and a second port 412 .
- Hydraulic pump 410 is a pump that can rotate in both directions, and by switching the rotation direction of motor 420, hydraulic fluid (for example, oil) is sucked from one of first port 411 and second port 412 and discharged from the other. to generate hydraulic pressure. Note that the hydraulic pump 410 can also suck the working fluid from the tank and discharge the working fluid from either the first port 411 or the second port 412 .
- the motor 420 operates the hydraulic pump 410 .
- Motor 420 drives hydraulic pump 410 with a rotational direction and rotational torque according to a control signal from control device 700 .
- Motor 420 may be an electric motor or may be an electric servomotor.
- the hydraulic cylinder 430 has a cylinder body 431 , a piston 432 and a piston rod 433 .
- the cylinder body 431 is fixed with respect to the injection device 300 .
- the piston 432 partitions the inside of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber.
- Piston rod 433 is fixed relative to stationary platen 110 .
- the front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via the first flow path 401 .
- the hydraulic fluid discharged from the first port 411 is supplied to the front chamber 435 through the first flow path 401, thereby pushing the injection device 300 forward.
- the injection device 300 is advanced and the nozzle 320 is pressed against the stationary mold 810 .
- the front chamber 435 functions as a pressure chamber that generates nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410 .
- 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 402 .
- the hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 through the second flow path 402, thereby pushing the injection device 300 rearward.
- the injection device 300 is retracted and the nozzle 320 is separated from the stationary mold 810 .
- the moving device 400 includes the hydraulic cylinder 430 in this embodiment, the present invention is not limited to this.
- an electric motor and a motion conversion mechanism that converts the rotary motion of the electric motor to the linear motion of the injection device 300 may be used instead of the hydraulic cylinder 430.
- the control device 700 is composed of, for example, a computer, and has a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704, as shown in FIGS.
- the control device 700 performs various controls by causing the CPU 701 to execute programs stored in the storage medium 702 .
- the control device 700 also receives signals from the outside through an input interface 703 and transmits signals to the outside through an output interface 704 .
- the control device 700 repeatedly performs a weighing process, a mold closing process, a pressurizing process, a mold clamping process, a filling process, a holding pressure process, a cooling process, a depressurizing process, a mold opening process, and an ejecting process, thereby producing a molded product.
- a series of operations for obtaining a molded product for example, the operation from the start of the weighing process to the start of the next weighing process, is also called “shot” or "molding cycle”.
- the time required for one shot is also called “molding cycle time" or "cycle time”.
- a single molding cycle has, for example, a weighing process, a mold closing process, a pressurization process, a mold clamping process, a filling process, a holding pressure process, a cooling process, a depressurization process, a mold opening process, and an ejection process in this order.
- the order here is the order of the start of each step.
- the filling process, holding pressure process, and cooling process are performed during the clamping process.
- the start of the clamping process may coincide with the start of the filling process. Completion of the depressurization process coincides with the start of the mold opening process.
- the metering step may occur during the cooling step of the previous molding cycle and may occur during the clamping step.
- the mold closing process may be performed at the beginning of the molding cycle.
- the filling process may also be initiated during the mold closing process.
- the ejecting process may be initiated during the mold opening process. If an on-off valve for opening and closing the flow path of the nozzle 320 is provided, the mold opening process may be initiated during the metering process. This is because the molding material does not leak from the nozzle 320 as long as the on-off valve closes the flow path of the nozzle 320 even if the mold opening process is started during the metering process.
- One molding cycle includes processes other than the weighing process, mold closing process, pressurizing process, mold clamping process, filling process, holding pressure process, cooling process, depressurizing process, mold opening process, and ejecting process.
- a pre-measuring suck-back process may be performed in which the screw 330 is retracted to a preset measuring start position before starting the measuring process. It is possible to reduce the pressure of molding material accumulated in front of the screw 330 before the start of the metering process, and to prevent the screw 330 from abrupt retraction at the start of the metering process.
- a post-weighing suck-back 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").
- 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 before the start of the filling process can be reduced, and leakage of the molding material from the nozzle 320 before the start of the filling process can be prevented.
- the control device 700 is connected to an operation device 750 that receives user input operations and a display device 760 that displays screens.
- the operation device 750 and the display device 760 may be configured by, for example, a touch panel 770 and integrated.
- a touch panel 770 as a display device 760 displays a screen under the control of the control device 700 .
- Information such as the settings of the injection molding machine 10 and the current state of the injection molding machine 10 may be displayed on the screen of the touch panel 770 .
- an operation unit such as a button for receiving an input operation by the user, an input field, or the like may be displayed.
- a touch panel 770 as the operation device 750 detects an input operation on the screen by the user and outputs a signal corresponding to the input operation to the control device 700 .
- the user can operate the operation unit provided on the screen while confirming the information displayed on the screen to set the injection molding machine 10 (including input of set values). can.
- the user can operate the operation unit provided on the screen to cause the injection molding machine 10 to operate corresponding to the operation unit.
- the operation of the injection molding machine 10 may be, for example, the operation (including stopping) of the mold clamping device 100, the ejector device 200, the injection device 300, the moving device 400, and the like.
- the operation of the injection molding machine 10 may be switching of screens displayed on the touch panel 770 as the display device 760 .
- the operating device 750 and the display device 760 of the present embodiment are described as being integrated as the touch panel 770, they may be provided independently. Also, 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 stationary platen 110).
- FIG. 3 is a configuration diagram of the toggle mechanism 150 included in the injection molding machine 10 according to the first embodiment.
- the link connection portion 131 of the toggle support 130 is connected with the second link 153 by the second connection mechanism 42 .
- a connecting pin 51 is used for the connection by the second connecting mechanism 42 .
- the connecting pin 51 is fixed to the connecting hole of the link connection portion 131 of the toggle support 130 so as not to rotate, and is pressed into the connecting hole 42A (see FIG. 7) of the second link 153 between the bush 42B (see FIG. 7). Make it slidable.
- a sliding surface between the bush 42B and the connecting pin 51 is lubricated.
- a third linking mechanism 43 connects between the first link 152 and the second link 153 .
- a connecting pin 52 is used for the connection by the third connecting mechanism 43 .
- the connecting pin 52 is fixed to the connecting hole of one of the first links 152 to prevent rotation, and the bushing 43B (see FIG. 7) is press-fitted into the connecting hole 43A (see FIG. 7) of the second link 153, which is the other connecting member. and can be slid between A sliding surface between the bush 43B and the connecting pin 52 is lubricated.
- connecting pins 50, 53 to 54 are fixed to one of the connecting members in a later-described connecting mechanism (first connecting mechanism 41, fourth connecting mechanism 44, fifth connecting mechanism 45) to prevent rotation, and the other connecting member It is slidable with a bush press-fitted into the member.
- the sliding surfaces between the bushes and the connecting pins 50, 53-54 are lubricated.
- the link connecting portion 121 of the movable platen 120 is connected with the first link 152 by the first connecting mechanism 41 .
- a connecting pin 50 is used for the connection by the first connecting mechanism 41 .
- the crosshead 151 is connected with the third link 154 by the fourth connecting mechanism 44 .
- a connecting pin 53 is used for the connection by the fourth connecting mechanism 44 .
- the third link 154 is connected to the second link 153 substantially in the positive direction of the Z-axis by the fifth connecting mechanism 45 .
- a connecting pin 54 is used for the connection by the fifth connecting mechanism 45 .
- the driving force generated by driving the mold clamping motor 160 moves the crosshead 151 in the X-axis direction.
- the second link 153 to which the crosshead 151 is connected via the third link 154 also moves.
- the second link 153 moves in an arc centering on the second coupling mechanism 42 on the XZ-axis plane.
- the first link 152 and the second link 153 bend and stretch, and the movable platen 120 advances and retreats with respect to the toggle support 130 .
- a strain gauge 156 is provided on the side surface of the second link 153 of the present embodiment substantially in the positive direction of the Z axis.
- the signal generated by strain gauge 156 is sent to controller 700 .
- the control device 700 determines whether wear has occurred in the coupling mechanism (for example, the second coupling mechanism 42 and the third coupling mechanism 43) connected to the second link 153. judge.
- FIG. 4 is a diagram showing a configuration example of the control device 700 according to this embodiment.
- a control circuit 701 provided in a control device 700 implements the configuration shown in FIG.
- the configuration shown in FIG. 4 may be realized by hardware connection, software control, or a combination of hardware connection and software control.
- the control device 700 includes a control section 711, an acquisition section 712, a determination section 713, and an output section 714.
- the control unit 711 controls the mold clamping motor 160 in each process of mold closing, pressure increase, mold clamping, depressurization, and mold opening.
- the control unit 711 drives and controls the mold clamping motor 160 to retract the crosshead 151 from the mold clamping position to the mold opening start position in the depressurization step.
- the acquisition unit 712 detects the strain generated in the second link 153 based on the signal (detected value) in the depressurization process of the strain gauge 156 (an example of the detection unit) provided on the second link 153 (an example of the link member). Get the amount (an example of the amount of change). In this embodiment, it is determined whether or not wear has occurred according to the amount of strain acquired in the decompression process. Therefore, the strain that occurs in the second link 153 of this embodiment will be described.
- FIG. 5 is a diagram showing forces generated within the toggle mechanism 150 in the depressurization process according to the first embodiment.
- the driving force generated by driving the mold clamping motor 160 generates a force 1501 that moves the crosshead 151 in the negative direction of the X axis. Due to the movement of the crosshead 151 in the X-axis negative direction, the third link 154 connected by the fourth connecting mechanism 44 also starts moving in the X-axis negative direction.
- the second link 153 is also connected to the third link 154 by a fifth connecting mechanism 45 provided substantially in the negative direction of the Z axis. Therefore, along with the movement of the third link 154, a force 1502 is generated to move the second link 153 about the second coupling mechanism 42 in the substantially negative Z-axis direction where the third link 154 exists. .
- a force 1502 is generated to move the second link 153 about the second coupling mechanism 42 in the substantially negative Z-axis direction where the third link 154 exists.
- the second link 153 moves according to the force 1502 , if the third linking mechanism 43 is worn, friction between the second link 153 and the linking pin 52 in the third linking mechanism 43 . occurs and a force 1503 is generated.
- the strain generated in the second link 153 is reduced because the mold clamping force is reduced.
- a connecting mechanism such as the third connecting mechanism 43
- a force in the direction opposite to the force 1502 is generated from the connecting mechanism, so the strain generated in the second link 153 increases. Therefore, in the present embodiment, it is determined whether or not wear has occurred based on whether or not the strain increases in the decompression process.
- FIG. 6 is a perspective view showing the shape of the second link 153 according to this embodiment
- FIG. 7 is a front view showing the shape of the second link 153 according to this embodiment.
- the second link 153 shown in FIGS. 6 and 7 is formed by casting.
- the second link 153 of the present embodiment is one of a plurality of links (an example of a plurality of link members) that constitute the toggle mechanism 150, and includes the fixed platen 110 (second platen) and the movable platen 120 ( A connecting hole 42A (an example of a first connecting portion) for forming a second connecting mechanism 42 and a connecting hole 43A (an example of a first connecting portion) for forming a third connecting mechanism 43 to connect the first platen). 1 connecting portion).
- the distance L1 from the center 42C of the connecting hole 42A and the center 43C of the connecting hole 43A to the side surface in the substantially positive Z-axis direction is equal to the distance L1 to the side surface in the substantially negative Z-axis direction.
- 42A of connection holes and 43 A of connection holes are formed so that it may become.
- the second link 153 of the present embodiment has a connecting hole 45A (an example of a second connecting portion).
- the center 45C of the connecting hole 45A exists substantially at the center of the length of the second link 153 in the X-axis direction. Also, the center 45C of the connecting hole 45A exists at a position closer to the Z-axis negative direction side. Thereby, it can be connected to the third link 154 existing in the Z-axis negative direction.
- a bush 42B is fitted into the connecting hole 42A of the second link 153 using a cooling fit.
- the bush 42B has a sliding surface on the inner side, and functions as a bearing for the connecting pin 51 provided so as to contact the inner side.
- a bushing 43B is fitted into the connecting hole 43A of the second link 153 using a cooling fit.
- the bush 43B has a sliding surface on the inner side, and thus functions as a bearing for the connecting pin 52 provided so as to contact the inner side.
- strain is generated in each of the regions 601, 602, and 603 among the side faces of the second link 153 on the Z-axis positive direction side. Therefore, in the control device 700 of the present embodiment, strain generated in any one of these regions 601 to 603 is measured to determine whether or not wear has occurred.
- strain gauge 156 an example of the detection unit
- strain may be measured in other regions 601 and 603 to determine whether or not wear has occurred.
- the determination unit 713 determines whether or not the strain amount acquired by the acquisition unit 712 exceeds a predetermined threshold value T1.
- FIG. 8 is a diagram exemplifying changes in the amount of strain acquired by the acquisition unit 712 in the depressurization process of the present embodiment.
- the horizontal axis indicates the passage of time, and the time "0" is the time when depressurization started.
- the vertical axis indicates the amount of strain and the clamping force.
- the mold clamping force 1801 decreases over time and approaches the mold clamping force "0".
- the example shown in FIG. 8 shows a strain amount change 1802 when there is no wear and a strain amount change 1803 when there is wear.
- strain has already occurred at the start of depressurization due to the mold clamping force in the mold clamping process. If there is no wear, as indicated by a strain amount change 1802, the strain amount approaches "0" after a predetermined period of time has elapsed.
- a threshold value T1 (absolute value) is set as a criterion for determining whether wear has occurred.
- the determination unit 713 determines that at least one of the bushings 42B and 43B of the second link 153 is worn because the absolute value of the strain amount is greater than the threshold value T1.
- the threshold value T1 which serves as a reference for the absolute value of the strain amount
- the threshold value T1 is not limited to that based on the absolute value of the strain amount, and for example, a threshold value may be set for the rate of change of the strain amount.
- the output unit 714 outputs the result of determination by the determination unit 713 .
- the display device 760 can be considered. good.
- FIG. 9 is a flow chart showing the procedure of the process of determining whether or not wear has occurred by the control device 700 according to the present embodiment. In the flowchart shown in FIG. 9, it is assumed that the process has progressed to the mold clamping step.
- the control unit 711 instructs the mold clamping motor 160 to start the depressurization process (S901).
- the mold clamping motor 160 in the depressurization process starts controlling to move the crosshead 151 in the negative direction of the X axis.
- the acquisition unit 712 acquires the strain amount from the signal output from the strain gauge 156 (S902).
- the determination unit 713 determines whether or not the acquired absolute value of the strain amount is greater than the threshold value T1 (S903). When it is determined that the absolute value of the acquired strain amount is greater than the threshold value T1 (S903: Yes), the output unit 714 outputs to the display device 760 or the like that wear has occurred (S904), and ends the process. do.
- the determination unit 713 determines whether the depressurization process is completed (S905). If it is determined that the depressurization process has not been completed (S905: No), the process is repeated from S902.
- the monitoring device of the injection molding machine 10 is the control device 700
- the monitoring device for the injection molding machine 10 is not limited to the control device 700, and any device that can monitor the injection molding machine 10 may be used.
- the monitoring device for the injection molding machine 10 may be a monitoring center connected to the injection molding machine 10 via a network. In this case, the monitoring center receives information indicating that the pressure release process has started and information indicating the amount of strain obtained from the strain gauge 156 via the public network. The monitoring center then determines whether wear has occurred based on the received information.
- it may be a portable diagnostic device owned by a worker who periodically diagnoses the injection molding machine 10.
- the operator attaches the strain gauge 156 to any one of the regions 601 to 603 of the second link 153 when performing diagnosis.
- the attached strain gauge 156 is connected to diagnostic equipment. Then, the diagnostic device determines whether or not wear occurs based on whether or not the amount of strain indicated by the signal received from the strain gauge 156 is greater than the threshold value T1.
- the strain gauge 156 is used to detect the amount of strain as the amount of change in the second link 153 (an example of the link member).
- the embodiment described above does not limit the amount of change in the second link 153 (an example of the link member) to the amount of strain. Therefore, in the second embodiment, a case will be described in which acceleration is detected as the amount of change occurring in the second link 153 .
- the same reference numerals are assigned to the same configurations as in the first embodiment, and the description thereof is omitted.
- an acceleration sensor is provided on the second link 153 (an example of the link member).
- an acceleration sensor is provided in the area 602 of the second link 153 shown in FIG. Although it is provided in the region 602 in this embodiment, it may be provided in another region.
- Acquisition unit 712 obtains the acceleration (an example of the amount of change) generated in second link 153 based on the signal (detected value) in the pressure release process of the acceleration sensor provided in second link 153 (an example of a link member). get. In this embodiment, it is determined whether or not wear has occurred according to the acceleration acquired in the depressurization process. As described above, when the bushes 43B and 42B wear, the coefficient of friction of the sliding surfaces increases. Therefore, when a force 1502 is generated in the depressurization process, vibration (acceleration) is generated in the region 602 due to friction generated inside the bushes 43B and 42B.
- the determination unit 713 determines whether the absolute value of the acceleration acquired by the acquisition unit 712 has exceeded a predetermined threshold value T2.
- FIG. 10 is a diagram exemplifying changes in acceleration acquired by the acquisition unit 712 in the depressurization process of this embodiment.
- the horizontal axis indicates the passage of time, and the time "0" is the time when depressurization started.
- the vertical axis indicates acceleration and clamping force.
- the mold clamping force 1001 decreases over time and approaches the mold clamping force "0".
- FIG. 10 shows changes 1002 in acceleration when worn.
- no acceleration occurs at the start of depressurization.
- acceleration is generated when the second link 153 moves in an arc around the second coupling mechanism 42 .
- a threshold value T2 absolute value is set as a criterion for determining whether wear has occurred.
- the determination unit 713 determines that there is an abnormality when the absolute value of the acceleration (vibration) is equal to or greater than a predetermined threshold value T2. Therefore, at time t2, the determination unit 713 determines that at least one of the bushes 42B and 43B of the second link 153 is worn because the absolute value of the acceleration is greater than the threshold value T2. Then, the output unit 714 outputs the determination result by the determination unit 713 .
- FIG. 11 is a flow chart showing the procedure of the process of determining whether or not wear has occurred by the control device 700 according to the present embodiment. In the flowchart shown in FIG. 11, it is assumed that the process has progressed to the mold clamping process.
- control unit 711 instructs the mold clamping motor 160 to start the depressurization process (S1101).
- the acquisition unit 712 acquires acceleration from the signal output from the acceleration sensor (S1102).
- the determination unit 713 determines whether or not the acquired absolute value of acceleration is greater than the threshold T2 (S1103). If it is determined that the absolute value of the acquired acceleration is greater than the threshold value T2 (S1103: Yes), the output unit 714 outputs to the display device 760 or the like that wear has occurred (S1104), and ends the process. .
- the determination unit 713 determines whether the depressurization process is completed (S1105). If it is determined that the depressurization process has not been completed (S1105: No), the process is repeated from S1102.
- any device that can monitor the injection molding machine 10 can be used.
- a monitoring center connected to the injection molding machine 10 via a network
- a portable diagnostic device owned by the operator who diagnoses the injection molding machine 10 may be used.
Abstract
Description
型締装置100の説明では、型閉時の可動プラテン120の移動方向(例えばX軸正方向)を前方とし、型開時の可動プラテン120の移動方向(例えばX軸負方向)を後方として説明する。
エジェクタ装置200の説明では、型締装置100の説明と同様に、型閉時の可動プラテン120の移動方向(例えばX軸正方向)を前方とし、型開時の可動プラテン120の移動方向(例えばX軸負方向)を後方として説明する。
射出装置300の説明では、型締装置100の説明やエジェクタ装置200の説明とは異なり、充填時のスクリュ330の移動方向(例えばX軸負方向)を前方とし、計量時のスクリュ330の移動方向(例えばX軸正方向)を後方として説明する。
移動装置400の説明では、射出装置300の説明と同様に、充填時のスクリュ330の移動方向(例えばX軸負方向)を前方とし、計量時のスクリュ330の移動方向(例えばX軸正方向)を後方として説明する。
制御装置700は、例えばコンピュータで構成され、図1~図2に示すようにCPU(Central Processing Unit)701と、メモリなどの記憶媒体702と、入力インターフェース703と、出力インターフェース704とを有する。制御装置700は、記憶媒体702に記憶されたプログラムをCPU701に実行させることにより、各種の制御を行う。また、制御装置700は、入力インターフェース703で外部からの信号を受信し、出力インターフェース704で外部に信号を送信する。
次に、トグル機構150の構成について説明する。図3は、第1の実施形態に係る射出成形機10が備えるトグル機構150の構成図である。
なお、上述した実施形態は、射出成形機10の監視装置が、制御装置700の場合について説明した。しかしながら、上述した実施形態は、射出成形機10の監視装置を、制御装置700に制限するものではなく、射出成形機10を監視可能な装置であればよい。変形例としては、射出成形機10の監視装置が、射出成形機10とネットワークを介して接続された監視センタであってもよい。この場合、監視センタは、公衆ネットワークを介して、脱圧工程が開始された旨の情報と、ひずみゲージ156から取得したひずみ量を示した情報と、受信する。そして、監視センタは、当該受信した情報に基づいて摩耗が生じたか否かを判定する。
第1の実施形態においては、第2リンク153(リンク部材の一例)に生じた変化量として、ひずみゲージ156を用いてひずみ量を検出する例について説明した。しかしながら、上述した実施形態は、第2リンク153(リンク部材の一例)に生じた変化量を、ひずみ量に制限するものではない。そこで、第2の実施形態では、第2リンク153に生じた変化量として、加速度を検出する場合について説明する。本実施形態においては、第1の実施形態と同様の構成については同一の符号を割り当て、説明を省略する。
第2の実施形態も、第1の実施形態の変形例と同様に、射出成形機10を監視可能な装置であればよく、例えば、射出成形機10とネットワークを介して接続された監視センタであってもよいし、射出成形機10の診断を行う作業者が所有する携帯型の診断装置であってもよい。
Claims (3)
- トグル機構のリンク部材に設けた検出部の、脱圧工程における検出値に基づいて、前記リンク部材に生じた変化量を取得する取得部と、
前記取得部によって取得された前記変化量が、所定の閾値を超えたか否かを判定する判定部と、
を有する射出成形機の監視装置。 - 前記取得部が取得する前記リンク部材に生じた前記変化量は、前記リンク部材に生じたひずみ量である、
請求項1に記載の射出成形機の監視装置。 - 前記取得部が取得する前記リンク部材に生じた前記変化量は、前記リンク部材に生じた加速度である、
請求項1に記載の射出成形機の監視装置。
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JPH10315287A (ja) * | 1997-05-19 | 1998-12-02 | Japan Steel Works Ltd:The | 射出成形機のトグル式型締装置 |
JP2011005796A (ja) * | 2009-06-29 | 2011-01-13 | Ube Machinery Corporation Ltd | トグル式型締装置におけるトグル機構の劣化診断方法および装置 |
JP2018058314A (ja) * | 2016-10-07 | 2018-04-12 | 東洋機械金属株式会社 | 成形機 |
JP2018140612A (ja) * | 2017-02-28 | 2018-09-13 | 住友重機械工業株式会社 | 射出成形機および射出成形方法 |
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JP7373161B2 (ja) | 2019-10-11 | 2023-11-02 | 国立大学法人東海国立大学機構 | 穴加工方法および中ぐり工具 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH10315287A (ja) * | 1997-05-19 | 1998-12-02 | Japan Steel Works Ltd:The | 射出成形機のトグル式型締装置 |
JP2011005796A (ja) * | 2009-06-29 | 2011-01-13 | Ube Machinery Corporation Ltd | トグル式型締装置におけるトグル機構の劣化診断方法および装置 |
JP2018058314A (ja) * | 2016-10-07 | 2018-04-12 | 東洋機械金属株式会社 | 成形機 |
JP2018140612A (ja) * | 2017-02-28 | 2018-09-13 | 住友重機械工業株式会社 | 射出成形機および射出成形方法 |
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