WO2017171047A1 - 射出成形用情報管理装置、および射出成形機 - Google Patents
射出成形用情報管理装置、および射出成形機 Download PDFInfo
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- WO2017171047A1 WO2017171047A1 PCT/JP2017/013724 JP2017013724W WO2017171047A1 WO 2017171047 A1 WO2017171047 A1 WO 2017171047A1 JP 2017013724 W JP2017013724 W JP 2017013724W WO 2017171047 A1 WO2017171047 A1 WO 2017171047A1
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- mold
- mold clamping
- injection molding
- deterioration
- movable
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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
- 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
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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
- B29C45/768—Detecting defective moulding conditions
Definitions
- the present invention relates to an information management apparatus for injection molding and an injection molding machine.
- the molding machine described in Patent Document 1 performs mold closing, mold clamping, and mold opening by advancing and retracting a movable die plate on which a movable mold is mounted by a driving force of a mold opening / closing servo motor.
- the molding machine includes a controller that determines that the mold opening is abnormal and stops the mold opening operation when the output torque of the mold opening / closing servomotor exceeds the determination torque during mold opening.
- the injection molding machine has a movable part and a drive part that moves the movable part.
- the present invention has been made in view of the above problems, and has as its main object the provision of an information management apparatus for injection molding that can detect deterioration of parts under various molding conditions.
- An information management apparatus for injection molding that manages information on parts of an injection molding machine having a movable part, a drive part that moves the movable part, and a drive force detection part that detects a drive force of the drive part.
- an information management apparatus for injection molding that detects deterioration of a part of the injection molding machine based on a detection value of the driving force detection section while the movable section is stopped.
- an information management apparatus for injection molding that can detect deterioration of parts under a wide variety of molding conditions.
- FIG. 1 is a diagram illustrating a state when mold opening of an injection molding machine according to an embodiment is completed.
- FIG. 2 is a diagram illustrating a state during mold clamping of the injection molding machine according to the embodiment.
- the injection molding machine includes a frame Fr, a mold clamping device 10, an injection device 40, an ejector device 50, and a control device 90.
- the moving direction of the movable platen 13 when the mold is closed (right direction in FIGS. 1 and 2) is the front, and the moving direction of the movable platen 13 when the mold is opened (left direction in FIGS. 1 and 2). This will be described as the rear.
- the mold clamping apparatus 10 performs mold closing, mold clamping, and mold opening of the mold apparatus 30.
- the mold clamping device 10 is, for example, a horizontal mold whose mold opening / closing direction is a horizontal direction.
- the mold clamping device 10 includes a fixed platen 12, a movable platen 13, a toggle support 15, a tie bar 16, a toggle mechanism 20, a mold clamping motor 25, and a motion conversion mechanism 26.
- the fixed platen 12 is fixed to the frame Fr.
- a fixed mold 32 is attached to a surface of the fixed platen 12 facing the movable platen 13.
- the movable platen 13 is movable along a guide (for example, guide rail) 17 laid on the frame Fr, and is movable forward and backward with respect to the fixed platen 12.
- a movable mold 33 is attached to the surface of the movable platen 13 facing the fixed platen 12.
- the mold is closed, clamped, and opened by moving the movable platen 13 back and forth with respect to the fixed platen 12.
- the fixed mold 32 and the movable mold 33 constitute a mold apparatus 30.
- the toggle support 15 is connected to the fixed platen 12 at an interval, and is placed on the frame Fr so as to be movable in the mold opening / closing direction.
- the toggle support 15 may be movable along a guide laid on the frame Fr.
- the guide of the toggle support 15 may be the same as the guide 17 of the movable platen 13.
- the fixed platen 12 is fixed to the frame Fr and the toggle support 15 is movable in the mold opening / closing direction with respect to the frame Fr.
- the toggle support 15 is fixed to the frame Fr and fixed to the fixed platen. 12 may be movable in the mold opening / closing direction with respect to the frame Fr.
- the tie bar 16 connects the fixed platen 12 and the toggle support 15 with an interval.
- a plurality of (for example, four) tie bars 16 may be used.
- Each tie bar 16 is parallel to the mold opening / closing direction and extends in accordance with the mold clamping force.
- At least one tie bar 16 is provided with a mold clamping force detector 18.
- the mold clamping force detector 18 detects the mold clamping force by detecting distortion of the tie bar 16 and sends a signal indicating the detection result to the control device 90.
- the clamping force detector 18 is not limited to the strain gauge type, but may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the mounting position thereof is not limited to the tie bar 16.
- the toggle mechanism 20 moves the movable platen 13 with respect to the fixed platen 12.
- the toggle mechanism 20 is disposed between the movable platen 13 and the toggle support 15.
- the toggle mechanism 20 includes a cross head 21 and a pair of link groups. Each link group includes a first link 22 and a second link 23 that are connected to each other by a pin or the like.
- the first link 22 is swingably attached to the movable platen 13 with a pin or the like
- the second link 23 is swingably attached to the toggle support 15 with a pin or the like.
- the second link 23 is coupled to the crosshead 21 via the third link 24.
- the configuration of the toggle mechanism 20 is not limited to the configuration shown in FIGS.
- the number of nodes is five, but may be four, and one end portion of the third link 24 may be coupled to the node between the first link 22 and the second link 23. .
- the mold clamping motor 25 is attached to the toggle support 15 and operates the toggle mechanism 20.
- the mold clamping motor 25 advances and retracts the cross head 21 to bend and extend the first link 22 and the second link 23 and advance and retract the movable platen 13.
- the motion conversion mechanism 26 converts the rotational motion of the mold clamping motor 25 into the linear motion of the cross head 21.
- the motion conversion mechanism 26 includes a screw shaft 26a and a screw nut 26b that is screwed into the screw shaft 26a.
- a ball or a roller may be interposed between the screw shaft 26a and the screw nut 26b.
- the control device 90 has a CPU (Central Processing Unit) 91, a storage medium 92 such as a memory, an input interface 93, and an output interface 94 as shown in FIGS.
- the control device 90 performs various controls by causing the CPU 91 to execute a program stored in the storage medium 92. Further, the control device 90 receives a signal from the outside through the input interface 93 and transmits a signal through the output interface 94 to the outside.
- the control device 90 controls a mold closing process, a mold clamping process, a mold opening process, and the like.
- the mold clamping motor 25 is driven to advance the cross head 21 to the mold closing completion position at a set speed, thereby moving the movable platen 13 forward and causing the movable mold 33 to touch the fixed mold 32.
- the position and speed of the cross head 21 are detected using, for example, the encoder 25a of the mold clamping motor 25.
- the encoder 25 a detects the rotation of the mold clamping motor 25 and sends a signal indicating the detection result to the control device 90.
- a mold clamping force is generated by further driving the mold clamping motor 25 to further advance the cross head 21 from the mold closing completion position to the mold clamping position.
- a cavity space 34 is formed between the movable mold 33 and the fixed mold 32 during mold clamping, and the injection device 40 fills the cavity space 34 with a liquid molding material.
- a molded product is obtained by solidifying the filled molding material.
- a plurality of cavity spaces 34 may be provided, and in this case, a plurality of molded products can be obtained simultaneously.
- the mold clamping motor 25 is driven to retract the cross head 21 to the mold opening completion position at a set speed, thereby retracting the movable platen 13 and separating the movable mold 33 from the fixed mold 32. Thereafter, the ejector device 50 projects the molded product from the movable mold 33.
- the toggle mechanism 20 amplifies the driving force of the mold clamping motor 25 and transmits it to the movable platen 13.
- the amplification magnification is also called toggle magnification.
- the toggle magnification changes according to an angle ⁇ formed by the first link 22 and the second link 23 (hereinafter also referred to as “link angle ⁇ ”).
- the link angle ⁇ is obtained from the position of the cross head 21. When the link angle ⁇ is 180 °, the toggle magnification is maximized.
- the mold thickness adjustment is performed so that a predetermined mold clamping force can be obtained at the time of mold clamping.
- the distance L between the fixed platen 12 and the toggle support 15 is set so that the link angle ⁇ of the toggle mechanism 20 becomes a predetermined angle when the movable mold 33 touches the fixed mold 32. Adjust.
- the mold clamping device 10 includes a mold thickness adjustment mechanism 60 that performs mold thickness adjustment by adjusting the distance L between the fixed platen 12 and the toggle support 15.
- the mold thickness adjusting mechanism 60 rotates a screw shaft 61 formed at the rear end portion of the tie bar 16, a screw nut 62 that is rotatably held by the toggle support 15, and a screw nut 62 that is screwed onto the screw shaft 61.
- a mold thickness adjusting motor 63 is a mold thickness adjusting motor 63.
- the screw shaft 61 and the screw nut 62 are provided for each tie bar 16.
- the rotation of the mold thickness adjusting motor 63 may be transmitted to a plurality of screw nuts 62 via a rotation transmitting unit 64 constituted by a belt, a pulley or the like.
- the plurality of screw nuts 62 can be rotated synchronously. It should be noted that the plurality of screw nuts 62 can be individually rotated by changing the transmission path of the rotation transmission unit 64.
- the rotation transmission part 64 may be comprised with a gear etc. instead of a belt, a pulley, etc.
- a passive gear is formed on the outer periphery of each screw nut 62
- a drive gear is attached to the output shaft of the mold thickness adjusting motor 63
- a plurality of passive gears and an intermediate gear that meshes with the drive gear are in the center of the toggle support 15. It is held rotatably.
- the operation of the mold thickness adjusting mechanism 60 is controlled by the control device 90.
- the control device 90 drives the mold thickness adjusting motor 63 to rotate the screw nut 62, thereby adjusting the position of the toggle support 15 that holds the screw nut 62 rotatably with respect to the fixed platen 12.
- the interval L with the toggle support 15 is adjusted.
- the screw nut 62 is rotatably held with respect to the toggle support 15 and the tie bar 16 on which the screw shaft 61 is formed is fixed to the fixed platen 12, but the present invention is not limited to this.
- the screw nut 62 may be rotatably held with respect to the fixed platen 12, and the tie bar 16 may be fixed with respect to the toggle support 15.
- the interval L can be adjusted by rotating the screw nut 62.
- the screw nut 62 may be fixed to the toggle support 15 and the tie bar 16 may be held rotatably with respect to the fixed platen 12. In this case, the interval L can be adjusted by rotating the tie bar 16.
- the screw nut 62 may be fixed to the fixed platen 12 and the tie bar 16 may be held rotatably with respect to the toggle support 15. In this case, the interval L can be adjusted by rotating the tie bar 16.
- the mold thickness adjusting mechanism 60 adjusts the distance L by rotating one of the screw shaft 61 and the screw nut 62 that are screwed together.
- a plurality of mold thickness adjusting mechanisms 60 may be used, and a plurality of mold thickness adjusting motors 63 may be used.
- the parts of the mold clamping device 10 deteriorate due to repeated molding operations.
- components that receive force particularly sliding components, are relatively susceptible to deterioration.
- sliding parts include a pin of the toggle mechanism 20, a motion conversion mechanism 26, and a bearing.
- the bearing may be either a sliding bearing such as a bush or a rolling bearing.
- the control device 90 monitors the driving force of the mold clamping motor 25 when the crosshead 21 is stopped at a predetermined position in order to detect deterioration of the components of the mold clamping device 10.
- the stop of the cross head 21 may be accompanied by the movement of the cross head 21 or may be temporarily performed during the movement.
- the stop of the cross head 21 may be repeated every molding cycle for manufacturing a molded product, or may be performed between molding cycles or during a molding cycle.
- a series of operations for obtaining a molded product for example, operations from the start of the mold closing process to the start of the next mold closing process are also referred to as “shot” and “molding cycle”.
- the stop of the cross head 21 may be performed during the control of the cross head 21, for example, during the position control of the cross head 21.
- the cross head 21 corresponds to the movable part described in the claims
- the mold clamping motor 25 corresponds to the drive part described in the claims.
- the driving force of the mold clamping motor 25 is expressed by the torque of the mold clamping motor 25, for example, and is detected by the torque detector 27.
- the torque detector 27 detects the torque of the mold clamping motor 25 by detecting the current of the mold clamping motor 25, and sends a signal indicating the detection result to the control device 90.
- the torque detector 27 corresponds to the driving force detector described in the claims.
- the torque of the mold clamping motor 25 can be obtained from the current command value of the mold clamping motor 25.
- the detection value of the torque detector 27 monitored by the control device 90 may be any of a peak value, an average value, a pattern, and the like while the crosshead 21 is stopped.
- the control device 90 detects deterioration of the parts of the mold clamping device 10 by comparing the peak value or the average value with the reference value, comparing the pattern with the reference pattern, or the like.
- the reference value, the reference pattern, and the like are obtained in advance by a test or the like, and those stored in the storage medium 92 are read and used.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the torque of the mold clamping motor 25 when the crosshead 21 is stopped at the mold opening completion position.
- the crosshead 21 stops before the mold opening completion position due to frictional resistance and the like, and the torque of the mold clamping motor 25 increases because the crosshead 21 is moved to the mold opening completion position.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 at the mold opening completion position increases.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 at the mold opening completion position is substantially zero.
- the control device 90 may determine that the components of the mold clamping device 10 have deteriorated.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the cross head 21 is stopped at the mold clamping position.
- the driving force of the mold clamping motor for maintaining the cross head 21 in the mold clamping position varies.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 in the mold clamping position is substantially constant.
- the control device 90 may determine that the components of the mold clamping device 10 have deteriorated.
- the control device 90 monitors the distortion of the tie bar 16 when the crosshead 21 is stopped at a predetermined position in order to detect deterioration of the components of the mold clamping device 10.
- the tie bar 16 corresponds to the driving force acting portion described in the claims.
- the distortion of the tie bar 16 can be detected by, for example, the mold clamping force detector 18.
- the mold clamping force detector 18 detects distortion of the tie bar 16 and sends a signal indicating the detection result to the control device 90.
- the mold clamping force detector 18 corresponds to the strain detector described in the claims.
- the detection value of the mold clamping force detector 18 monitored by the control device 90 may be any of a peak value, an average value, a pattern, and the like while the crosshead 21 is stopped.
- the control device 90 detects deterioration of the parts of the mold clamping device 10 by comparing the peak value or the average value with the reference value, comparing the pattern with the reference pattern, or the like.
- the reference value, the reference pattern, and the like are obtained in advance by a test or the like, and those stored in the storage medium 92 are read and used.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the distortion of the tie bar 16 when the crosshead 21 is stopped at the mold opening completion position. If the parts of the mold clamping device 10 deteriorate and, for example, the balance of the tie bar 16 is lost, strain remains in the tie bar 16 when the mold opening is completed. When the parts of the mold clamping device 10 are not deteriorated, the distortion of the tie bar 16 when the mold opening is completed is substantially zero. When the strain of the tie bar 16 is equal to or greater than the threshold, the control device 90 may determine that the parts of the mold clamping device 10 have deteriorated.
- control device 90 may monitor the distortion of the tie bar 16 when the crosshead 21 is stopped at the mold clamping position in order to detect the deterioration of the components of the mold clamping device 10.
- the parts of the mold clamping device 10 are deteriorated, for example, the balance of the tie bar 16 is lost, the distortion of the tie bar 16 at the time of mold clamping varies.
- the distortion of the tie bar 16 during mold clamping is substantially constant.
- the control device 90 may determine that the parts of the mold clamping device 10 have deteriorated.
- the driving force acting part is not limited to the tie bar 16 as long as it is distorted by the driving force of the mold clamping motor 25.
- Examples of the driving force action unit include a toggle mechanism 20, a motion conversion mechanism 26, a movable platen 13, and a fixed platen 12.
- the control device 90 deteriorates the components of the mold clamping device 10 based on the driving force of the mold clamping motor 25 and the distortion of the tie bar 16 when the crosshead 21 is stopped at a predetermined position. Is detected. Since the cross head 21 is stopped at a predetermined position regardless of the molding conditions such as the mold apparatus 30 and the molding material, it is possible to cope with various molding conditions.
- the control device 90 may estimate the degree of deterioration of the components of the mold clamping device 10 based on the driving force of the mold clamping motor 25 and the distortion of the tie bar 16 when the crosshead 21 is stopped at a predetermined position.
- the relationship between the driving force of the mold clamping motor 25 and the distortion of the tie bar 16 and the degree of deterioration of the components of the mold clamping apparatus 10 is obtained by a durability test or the like, and the data stored in the storage medium 92 in advance is read and used.
- the control device 90 causes the output device 96 to output a notification regarding the estimated deterioration degree.
- An image display device, a speaker, a warning light, or the like is used for the output device 96, and an image, sound, light, or the like is used for notification.
- the user of the injection molding machine that has received the notification can know the degree of deterioration of the components of the mold clamping device 10 and the like.
- control device 90 may cause the output device 96 to output a notification indicating the relationship between the estimated degree of deterioration and its allowable range.
- the user of the injection molding machine that has received the notification can know the remaining life of the parts of the mold clamping device 10.
- the parts of the mold clamping device 10 can be replaced before the parts of the mold clamping device 10 are damaged.
- control device 90 may cause the output device 96 to output an alarm when the estimated degree of deterioration exceeds the allowable range.
- a plurality of allowable threshold values may be prepared, and a plurality of types of alarms may be prepared. In this case, the control device 90 causes the output device 96 to output an alarm corresponding to the estimated degree of deterioration.
- the control device 90 may stop the operation of the injection molding machine when the estimated deterioration degree exceeds the allowable range.
- the control device 90 may stop the operation of the injection molding machine when detecting a serious abnormality.
- the operation of stopping may be, for example, a cycle operation for repeatedly manufacturing a molded product. If a severe abnormality has not occurred and only a sign of a severe abnormality has occurred, the controller 90 may continue the cycle operation. Thereafter, when a serious abnormality occurs, the cycle operation is interrupted, and the failed part is repaired or replaced.
- the control device 90 may transmit a notification regarding deterioration of the components of the mold clamping device 10 to the management server 98 via the network 97 such as the Internet line. At this time, the control device 90 associates the notification regarding the deterioration of the parts of the mold clamping device 10 with the identification number of the injection molding machine, and transmits it to the management server 98. Similar to the control device 90, the management server 98 includes a CPU, a storage medium, and the like.
- Management server 98 receives the information transmitted from control device 90.
- the management server 98 transmits the received information to the receiving terminal 99 registered in advance via the network 97.
- the receiving terminal 99 may be a fixed terminal such as a computer or a mobile terminal such as a mobile phone.
- the user of the injection molding machine can save the trouble of contacting the administrator of the injection molding machine. Based on the information received by the receiving terminal 99, the administrator prepares replacement parts, arranges repair work personnel, and the like.
- control device 90 may transmit information to the receiving terminal 99 registered in advance without using the management server 98.
- FIG. 3 is a diagram illustrating a temporal change in the position of the crosshead according to an embodiment. The position of the crosshead 21 shown in FIG.
- the mold clamping motor 25 is driven to advance the cross head 21 to the mold closing completion position at a set speed, thereby moving the movable platen 13 forward and causing the movable mold 33 to touch the fixed mold 32.
- the position and speed of the cross head 21 are detected using, for example, the encoder 25a of the mold clamping motor 25.
- the encoder 25a of the mold clamping motor 25 detects the rotation of the mold clamping motor 25 and sends a signal indicating the detection result to the control device 90.
- a mold clamping force is generated by further driving the mold clamping motor 25 to further advance the cross head 21 from the mold closing completion position to the mold clamping position.
- a cavity space 34 is formed between the movable mold 33 and the fixed mold 32 during mold clamping, and the injection device 40 fills the cavity space 34 with a liquid molding material.
- a molded product is obtained by solidifying the filled molding material.
- a plurality of cavity spaces 34 may be provided, and in this case, a plurality of molded products can be obtained simultaneously.
- the mold clamping motor 25 is driven to retract the cross head 21 to the mold opening completion position at a set speed, thereby retracting the movable platen 13 and separating the movable mold 33 from the fixed mold 32. Thereafter, the ejector device 50 ejects the molded product from the movable mold 33.
- the setting conditions in the mold closing process and the mold clamping process are collectively set as a series of setting conditions.
- the speed and position of the cross head 21 in the mold closing process and the mold clamping process (including the speed switching position, the mold closing completion position, and the mold clamping position) are collectively set as a series of setting conditions.
- the speed and position of the movable platen 13 may be set.
- a mold clamping force may be set instead of the position of the cross head (for example, the mold clamping position) or the position of the movable platen.
- the control device 90 advances the cross head 21 from the mold opening completion position to the mold clamping position, stops at the mold clamping position for a predetermined time, and retracts from the mold clamping position to the mold opening completion position. It is repeatedly performed for a predetermined time at the mold opening completion position.
- the cross head 21 is stopped at the mold opening completion position and the mold clamping position.
- control device 90 detects deterioration of the components of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the crosshead 21 is stopped at at least one of the mold opening completion position and the mold clamping position. The presence or absence of an abnormality due to the deterioration may be determined.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the torque of the mold clamping motor 25 when the crosshead 21 is stopped at the mold opening completion position.
- the crosshead 21 stops before the mold opening completion position due to frictional resistance and the like, and the torque of the mold clamping motor 25 increases because the crosshead 21 is moved to the mold opening completion position.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 at the mold opening completion position increases.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 at the mold opening completion position is substantially zero.
- the control device 90 may determine that a part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the cross head 21 is stopped at the mold clamping position.
- the driving force of the mold clamping motor for maintaining the cross head 21 in the mold clamping position varies.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 in the mold clamping position is substantially constant.
- the control device 90 may determine that a part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- the control device 90 may detect the deterioration of the parts of the mold clamping device 10 based on the distortion of the tie bar 16 when the crosshead 21 is stopped at at least one of the mold opening completion position and the mold clamping position. The presence or absence of abnormality due to deterioration may be determined.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the distortion of the tie bar 16 when the crosshead 21 is stopped at the mold opening completion position. If the parts of the mold clamping device 10 deteriorate and, for example, the balance of the tie bar 16 is lost, strain remains in the tie bar 16 when the mold opening is completed. When the parts of the mold clamping device 10 are not deteriorated, the distortion of the tie bar 16 when the mold opening is completed is substantially zero. When the strain of the tie bar 16 is equal to or greater than the threshold, the control device 90 may determine that the part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- control device 90 may monitor the distortion of the tie bar 16 when the crosshead 21 is stopped at the mold clamping position in order to detect the deterioration of the components of the mold clamping device 10.
- the distortion of the tie bar 16 at the time of mold clamping varies.
- the distortion of the tie bar 16 during mold clamping is substantially constant.
- the control device 90 may determine that the part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- the control device 90 may determine the presence or absence of an abnormality due to deterioration at a plurality of different stop positions. By determining the presence / absence of abnormality due to deterioration at a plurality of different stop positions, the presence / absence of a plurality of types of abnormality can be determined, and the degree of deterioration can be determined in two or more stages. For example, the control device 90 may vary the degree of deterioration between a case where it is determined that an abnormality has occurred only at one stop position and a case where it is determined that an abnormality has occurred at a plurality of different stop positions. Since the degree of deterioration can be determined in two or more stages, the degree of deterioration can be managed with high accuracy. Also, as described above, different types of alarms can be output depending on the degree of deterioration.
- the control device 90 may determine whether or not there is an abnormality due to deterioration of the motion conversion mechanism 26 among the components of the mold clamping device 10, and may estimate a deteriorated portion of the motion conversion mechanism 26.
- the deteriorated portion of the motion conversion mechanism 26 can be estimated from the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26.
- the stop position of the crosshead 21 when it is determined that there is an abnormality due to deterioration of the motion conversion mechanism 26 is the mold opening completion position
- the screw at the time of mold opening completion (see FIG. 1) of the screw shaft 26a It is estimated that the screwed portion with the nut 26b is the deteriorated position.
- the screw nut 26b at the time of mold clamping (see FIG. 2) of the screw shaft 26a. It is presumed that the screwed portion is a deteriorated position.
- control device 90 is configured to be screw nut 26b. It may be determined that has deteriorated.
- the control device 90 may set a dedicated time for detecting the deterioration of the components of the mold clamping device 10 (for example, the deterioration detection time shown in FIG. 3) during the molding cycle and / or between the molding cycles.
- the time for stopping the crosshead 21 at the mold opening completion position in one shot is set longer than the time for stopping the crosshead at the mold opening completion position in another shot.
- the time during the molding cycle is set at the end of the stop time in FIG. 3, it may be set at the beginning of the stop time or may be set in the middle of the stop time.
- the controller 90 sets the time for stopping the crosshead 21 in the mold clamping position in one shot to be longer than the time for stopping the crosshead 21 in the mold clamping position in another shot.
- the detection time may be set during the molding cycle.
- the deterioration detection time may be set every time the number of shots reaches a predetermined number of times, but may be set for each shot or may be set for each predetermined shot.
- FIG. 4 is a view showing an operation of compression molding of the mold clamping device according to the embodiment.
- 4A shows the state when the crosshead is at the mold opening completion position
- FIG. 4B shows the state when the crosshead is at the compression standby position
- FIG. 4C shows the state when the crosshead is compression molded.
- Each state when in position is shown.
- FIG. 5 is a diagram illustrating a temporal change in the position of the crosshead in the compression molding of the mold clamping device according to the embodiment.
- the mold 4 includes a fixed mold 32A attached to the fixed platen 12 and a movable mold 33A attached to the movable platen 13.
- the movable mold 33A includes a mold main body portion 35A, a frame-shaped portion 36A, and a spring portion 37A.
- the frame-shaped part 36A surrounds the convex part of the mold main body part 35A and is connected to the mold main body part 35A via the spring part 37A.
- the control device 90 advances the movable platen 13 by moving the cross head 21 forward from the mold opening completion position shown in FIG. As a result, the frame-shaped portion 36A of the movable mold 33A is pressed against the fixed mold 32A, the spring portion 37A of the movable mold 33A is contracted, and the space between the mold body 35A of the movable mold 33A and the fixed mold 32A is reduced. A cavity space 34 ⁇ / b> A is formed.
- control device 90 holds the crosshead 21 at the compression standby position for a predetermined time. Meanwhile, the controller 90 starts a filling process for filling the cavity space 34A with the molding material.
- control device 90 further advances the movable platen 13 by further advancing the cross head 21 from the compression standby position to the compression molding position.
- the spring portion 37A of the movable mold 33A further shrinks, the cavity space 34A becomes smaller, and the molding material filled in the cavity space 34A is compressed.
- control device 90 holds the cross head 21 at the compression molding position for a predetermined time. While the crosshead 21 is held at the compression molding position for a predetermined time, the molding material filled in the cavity space 34A is solidified to obtain a molded product.
- the control device 90 retracts the crosshead 21 from the compression molding position to the mold opening completion position.
- the crosshead 21 is held at the compression molding position for a predetermined time, and then the crosshead 21 is retracted to the mold opening completion position. During this time, the crosshead 21 is moved forward or backward. It is also possible to stop it halfway. There is no limit to the number of setting positions of the crosshead 21.
- the control device 90 advances the crosshead 21 from the mold opening completion position to the compression standby position, stops at the compression standby position for a predetermined time, advances from the compression standby position to the compression molding position, and performs compression. Stopping at a molding position for a predetermined time, retreating from a compression molding position to a mold opening completion position, and stopping at a mold opening completion position for a predetermined time are repeated. The cross head 21 is stopped at the mold opening completion position, the compression standby position, and the compression molding position.
- control device 90 performs components of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the crosshead 21 is stopped at at least one of the mold opening completion position, the compression standby position, and the compression molding position. May be detected, and the presence or absence of an abnormality due to the deterioration may be determined.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the torque of the mold clamping motor 25 when the crosshead 21 is stopped at the mold opening completion position.
- the crosshead 21 stops before the mold opening completion position due to frictional resistance and the like, and the torque of the mold clamping motor 25 increases because the crosshead 21 is moved to the mold opening completion position.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 at the mold opening completion position increases.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 at the mold opening completion position is substantially zero.
- the control device 90 may determine that a part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the cross head 21 is stopped at the compression standby position.
- the driving force of the mold clamping motor for maintaining the cross head 21 at the compression standby position against the elastic restoring force of the spring portion 37A varies.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 at the compression standby position is substantially constant.
- the control device 90 may determine that a part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the cross head 21 is stopped at the compression molding position.
- the driving force of the mold clamping motor for maintaining the crosshead 21 at the compression molding position fluctuates against the elastic restoring force of the spring portion 37A and the pressure of the molding material.
- the torque of the mold clamping motor 25 for maintaining the cross head 21 in the compression molding position is substantially constant.
- the control device 90 may determine that a part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the distortion of the tie bar 16 when the crosshead 21 is stopped at at least one of the mold opening completion position, the compression standby position, and the compression molding position. The presence or absence of abnormality due to the deterioration may be determined.
- the control device 90 detects the deterioration of the parts of the mold clamping device 10 based on the distortion of the tie bar 16 when the crosshead 21 is stopped at the mold opening completion position. If the parts of the mold clamping device 10 deteriorate and, for example, the balance of the tie bar 16 is lost, strain remains in the tie bar 16 when the mold opening is completed. When the parts of the mold clamping device 10 are not deteriorated, the distortion of the tie bar 16 when the mold opening is completed is substantially zero. When the strain of the tie bar 16 is equal to or greater than the threshold, the control device 90 may determine that the part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- control device 90 may monitor the distortion of the tie bar 16 when the crosshead 21 is stopped at the compression standby position in order to detect the deterioration of the parts of the mold clamping device 10.
- the distortion of the tie bar 16 during the compression standby varies.
- the distortion of the tie bar 16 during the compression standby is substantially constant.
- the control device 90 may determine that the part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- control device 90 may monitor the distortion of the tie bar 16 when the cross head 21 is stopped at the compression molding position in order to detect the deterioration of the parts of the mold clamping device 10.
- the parts of the mold clamping device 10 are deteriorated, for example, when the balance of the tie bar 16 is lost, the distortion of the tie bar 16 during compression varies.
- the components of the mold clamping device 10 are not deteriorated, the distortion of the tie bar 16 at the time of compression is substantially constant.
- the control device 90 may determine that the part of the mold clamping device 10 has deteriorated and an abnormality has occurred.
- the control device 90 may determine the presence or absence of an abnormality due to deterioration at a plurality of different stop positions. By determining the presence / absence of abnormality due to deterioration at a plurality of different stop positions, the presence / absence of a plurality of types of abnormality can be determined, and the degree of deterioration can be determined in two or more stages. For example, the control device 90 may vary the degree of deterioration between a case where it is determined that an abnormality has occurred only at one stop position and a case where it is determined that an abnormality has occurred at a plurality of different stop positions. Since the degree of deterioration can be determined in two or more stages, the degree of deterioration can be managed with high accuracy. Also, as described above, different types of alarms can be output depending on the degree of deterioration.
- the control device 90 may determine whether or not there is an abnormality due to deterioration of the motion conversion mechanism 26 among the components of the mold clamping device 10, and may estimate a deteriorated portion of the motion conversion mechanism 26.
- the deteriorated portion of the motion conversion mechanism 26 can be estimated from the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26.
- the mold opening completion position when the stop position of the crosshead 21 when it is determined that there is an abnormality due to deterioration of the motion conversion mechanism 26 is the mold opening completion position, the mold opening completion of the screw shaft 26a (see FIG. 4A). ) Is estimated to be a degraded position.
- the stop position of the crosshead 21 when it is determined that there is an abnormality due to deterioration of the motion conversion mechanism 26 is the compression standby position, among the screw shafts 26a, during compression standby (see FIG. 4B). It is presumed that the screwed portion with the screw nut 26b is the deteriorated position.
- the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26 is the compression molding position, of the screw shaft 26a at the time of compression molding (see FIG. 4C). It is presumed that the screwed portion with the screw nut 26b is the deteriorated position.
- the control device 90 determines that the nut 26b has deteriorated.
- the control device 90 may set a dedicated time (for example, a deterioration detection time shown in FIG. 5) for detecting deterioration of the parts of the mold clamping device 10 during the molding cycle and / or between the molding cycles.
- a dedicated time for example, a deterioration detection time shown in FIG. 5
- the time for stopping the crosshead 21 at the mold opening completion position in one shot is set longer than the time for stopping the crosshead at the mold opening completion position in another shot.
- the time during the molding cycle is set at the end of the stop time in FIG. 5, it may be set at the beginning of the stop time or may be set in the middle of the stop time.
- the controller 90 sets the time for stopping the crosshead 21 at the compression standby position in one shot to be longer than the time for stopping the crosshead 21 at the compression standby position in another shot.
- the detection time may be set during the molding cycle.
- the degradation detection time is set. It may be set during the molding cycle.
- the deterioration detection time may be set every time the number of shots reaches a predetermined number of times, but may be set for each shot or may be set for each predetermined shot.
- the movable mold 33A has the mold main body portion 35A, the frame-shaped portion 36A, and the spring portion 37A, but the fixed mold 32A has the mold main body portion, the frame-shaped portion, and the spring portion. May be.
- a hydraulic cylinder may be used instead of the spring portion 37A as a member disposed between the mold main body portion 35A and the frame-like portion 36A.
- the mold apparatus 30A may be an inlay type or the like.
- control device 90 corresponds to the information management device for injection molding described in the claims, but the information management device for injection molding may be provided separately from the control device 90.
- corresponds to the movable part as described in a claim
- corresponds to the drive part as described in a claim, this invention is not limited to this.
- the control device 90 of the above embodiment is used to detect the deterioration of the components of the mold clamping device 10, but detects the deterioration of the components of the injection device 40 and brings the injection device 40 into and out of contact with the mold device 30.
- You may use for the detection of the deterioration of the components of a moving apparatus, the detection of the deterioration of the components of the ejector apparatus 50, etc.
- the components may be used for detecting deterioration of a component that receives a force, particularly a sliding component.
- the sliding component include a motion conversion mechanism such as a ball screw mechanism as described above.
- the mold clamping device 10 of the above embodiment is a horizontal mold whose horizontal direction is the mold opening / closing direction, but may be a vertical mold whose vertical direction is the mold opening / closing direction.
- the vertical mold clamping device has a lower platen, upper platen, toggle support, tie bar, toggle mechanism, mold clamping motor, mold thickness adjusting mechanism, and the like.
- One of the lower platen and the upper platen is used as a fixed platen, and the other is used as a movable platen.
- a lower mold is attached to the lower platen, and an upper mold is attached to the upper platen.
- the lower die and the upper die constitute a mold apparatus.
- the lower mold may be attached to the lower platen via a rotary table.
- the toggle support is disposed below the lower platen.
- the toggle mechanism is disposed between the toggle support and the lower platen.
- the tie bar is parallel to the vertical direction, passes through the lower platen, and connects the upper platen and the toggle support.
- the vertical mold thickness adjustment mechanism adjusts the mold thickness by adjusting the distance between the upper platen and the toggle support according to changes in the thickness of the mold apparatus.
- the interval between the upper platen and the toggle support is adjusted so that the link angle of the toggle mechanism becomes a predetermined angle at the time of mold touch when the lower mold and the upper mold touch.
- the link angle can be adjusted to a predetermined angle when mold closing is completed, and a predetermined mold clamping force can be obtained during mold clamping.
- the mold thickness adjusting mechanism includes a screw shaft formed on the tie bar, a screw nut held on one of the upper platen and the toggle support, and a mold thickness adjusting motor that rotates one of the screw shaft and the screw nut that are screwed together. Have.
- the mold thickness adjusting mechanism may further include a screw nut held on the other of the upper platen and the toggle support.
- the mold clamping device 10 of the above embodiment has a toggle mechanism 20 and a mold clamping motor 25 that operates the toggle mechanism 20, but may have a linear motor for mold opening and closing and an electromagnet for mold clamping.
- the electromagnet type mold clamping device has, for example, a fixed platen, a movable platen, a rear platen, a tie bar, a suction plate, a rod, and a mold thickness adjusting mechanism.
- the rear platen is disposed on the side opposite to the stationary platen with respect to the movable platen (that is, behind the movable platen).
- the tie bar connects the fixed platen and the rear platen at an interval in the mold opening / closing direction.
- the suction plate can move forward and backward together with the movable platen behind the rear platen.
- the rod is inserted into the through hole of the rear platen and connects the movable platen and the suction plate.
- An electromagnet is formed on at least one of the rear platen and the attracting plate, and an attracting force by the electromagnet acts between the rear platen and the attracting plate to generate a clamping force.
- Electromagnet type mold thickness adjustment mechanism adjusts the mold thickness by adjusting the distance between the movable platen and the suction plate.
- the distance between the movable platen and the suction plate is adjusted so that a predetermined gap is formed between the suction plate and the rear platen at the time of the mold touch when the movable mold and the fixed mold touch.
- a predetermined gap can be formed between the suction plate and the rear platen when the mold closing is completed, and a predetermined mold clamping force can be obtained at the time of mold clamping.
- the mold thickness adjusting mechanism includes a screw shaft formed on the rod, a screw nut held on one of the movable platen and the suction plate, and a mold thickness adjusting motor that rotates one of the screw shaft and the screw nut that are screwed together.
- the mold thickness adjusting mechanism may further include a screw nut held on the other of the movable platen and the suction plate.
- Mold clamping device 12 Fixed platen 13 Movable platen 15 Toggle support 16 Tie bar 18 Clamping force detector 20 Toggle mechanism 21 Crosshead 25 Mold clamping motor 26 Motion conversion mechanism 27 Torque detector 30 Mold device 40 Injection device 50 Ejector device 90 Control device
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
可動部と、前記可動部を移動させる駆動部と、前記駆動部の駆動力を検出する駆動力検出部とを有する射出成形機の部品の情報を管理する、射出成形用情報管理装置であって、
前記可動部の停止中の前記駆動力検出部の検出値に基づいて、前記射出成形機の部品の劣化を検出する、射出成形用情報管理装置が提供される。
12 固定プラテン
13 可動プラテン
15 トグルサポート
16 タイバー
18 型締力検出器
20 トグル機構
21 クロスヘッド
25 型締モータ
26 運動変換機構
27 トルク検出器
30 金型装置
40 射出装置
50 エジェクタ装置
90 制御装置
Claims (5)
- 可動部と、前記可動部を移動させる駆動部と、前記駆動部の駆動力を検出する駆動力検出部とを有する射出成形機の部品の情報を管理する、射出成形用情報管理装置であって、
前記可動部の停止中の前記駆動力検出部の検出値に基づいて、前記射出成形機の部品の劣化を検出する、射出成形用情報管理装置。 - 前記射出成形機は、前記駆動部の駆動力によって歪む駆動力作用部と、前記駆動力作用部の歪を検出する歪検出部を有し、
前記射出成形用情報管理装置は、前記可動部の停止中の前記駆動力検出部の検出値と前記歪検出部の検出値とに基づいて、前記射出成形機の部品の劣化を検出する、請求項1に記載の射出成形用情報管理装置。 - 可動部と、前記可動部を移動させる駆動部と、前記駆動部の駆動力によって歪む駆動力作用部と、前記駆動力作用部の歪を検出する歪検出部とを有する射出成形機の部品の情報を管理する、射出成形用情報管理装置であって、
前記可動部の停止中の前記歪検出部の検出値に基づいて、前記射出成形機の部品の劣化を検出する、射出成形用情報管理装置。 - 前記射出成形用情報管理装置は、所定ショット毎に、前記射出成形機の部品の劣化を検出するための前記可動部の停止時間を成形サイクル中または/および成形サイクル間に設定する、請求項1~3のいずれか1項に記載の射出成形用情報管理装置。
- 金型装置の型閉、型締、および型開を行う型締装置と、
前記金型装置内に成形材料を充填する射出装置と、
請求項1~4のいずれか1項に記載の射出成形用情報管理装置とを含む、射出成形機。
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JP2018509681A JP6744911B2 (ja) | 2016-03-31 | 2017-03-31 | 射出成形用情報管理装置、および射出成形機 |
CN201780014833.5A CN108698296B (zh) | 2016-03-31 | 2017-03-31 | 注射成型用信息管理装置及注射成型机 |
EP17775578.2A EP3437826B1 (en) | 2016-03-31 | 2017-03-31 | Information management device for injection molding, and injection molding machine |
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JP2016071610 | 2016-03-31 | ||
JP2016-071610 | 2016-03-31 |
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EP (1) | EP3437826B1 (ja) |
JP (1) | JP6744911B2 (ja) |
CN (1) | CN108698296B (ja) |
WO (1) | WO2017171047A1 (ja) |
Cited By (2)
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CN113001921A (zh) * | 2021-02-25 | 2021-06-22 | 北京化工大学 | 一种肘杆式合模机构的最优锁模力的设定方法 |
CN113459450A (zh) * | 2020-03-31 | 2021-10-01 | 住友重机械工业株式会社 | 注射成型机 |
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- 2017-03-31 JP JP2018509681A patent/JP6744911B2/ja active Active
- 2017-03-31 WO PCT/JP2017/013724 patent/WO2017171047A1/ja active Application Filing
- 2017-03-31 CN CN201780014833.5A patent/CN108698296B/zh active Active
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JP6744911B2 (ja) | 2020-08-19 |
EP3437826A1 (en) | 2019-02-06 |
CN108698296A (zh) | 2018-10-23 |
JPWO2017171047A1 (ja) | 2019-02-14 |
CN108698296B (zh) | 2020-12-11 |
EP3437826B1 (en) | 2022-07-27 |
EP3437826A4 (en) | 2019-11-13 |
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