CN112026119B - Measurement system and method for obtaining vibration dynamic characteristics of movable mold plate of injection molding machine - Google Patents
Measurement system and method for obtaining vibration dynamic characteristics of movable mold plate of injection molding machine Download PDFInfo
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- CN112026119B CN112026119B CN202010777033.2A CN202010777033A CN112026119B CN 112026119 B CN112026119 B CN 112026119B CN 202010777033 A CN202010777033 A CN 202010777033A CN 112026119 B CN112026119 B CN 112026119B
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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
- B29C45/66—Mould opening, closing or clamping devices mechanical
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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
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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
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical 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
- B29C2945/76003—Measured parameter
- B29C2945/76006—Pressure
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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
- B29C2945/76227—Closure or clamping unit mould platen
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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
-
- 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
- B29C2945/76461—Optical, e.g. laser
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a measuring system and a method for obtaining vibration dynamic characteristics of a movable template of an injection molding machine, and the measuring system comprises the movable template, a special fixed template for detection, a template displacement device, a special mold for detection, a pushing power device, a force sensor, a vibration exciter, a vibration meter and a measurement and control system, wherein the template displacement device is respectively connected with the movable template and the special fixed template for detection, the pushing power device is connected with the movable template, the pushing power device is used for providing mold locking force during mold closing, the special mold for detection is arranged between the movable template and the special fixed template for detection, the force sensor is arranged on the special mold for detection, the vibration meter and the vibration exciter are arranged on one side of the movable template and are connected with the movable template, and the measurement and control system is respectively connected with the vibration exciter, the vibration meter, the force sensor, the pushing power device and the template displacement device. The invention accurately measures the dynamic characteristics of the movable template under different working conditions in the whole working process of the injection molding machine, and the test simulation environment system is closer to the actual working condition, thereby having high measurement precision and simple operation.
Description
Technical Field
The invention relates to the technical field of injection molding machine measurement, in particular to a measurement system and a measurement method for obtaining vibration dynamic characteristics of a movable template of an injection molding machine.
Background
The rising and rapid development of the plastic industry, the increasing demand of the market for plastic products, the higher the quality, diversity and various requirements of the plastic products, the faster and faster the upgrading and updating of injection molding equipment, and the necessary criteria of processing and manufacturing industry, namely energy conservation, precision and high efficiency, are also the necessary requirements of the upgrading and updating of injection molding machines. Along with the development and perfection of hydraulic and electric control technologies, a two-plate injection molding machine is produced at the same time, and compared with a traditional three-plate injection molding machine, the two-plate injection molding machine has the great advantage and is popular with manufacturing enterprises after gradually entering the market. The original third template is abandoned to the two-plate injection molding machine, the mode that the movable template and the fixed template are combined is adopted, the mold locking force directly acts on the two templates of the fixed mold, a large amount of space and cost are saved, the weight of a mold locking system is reduced, the impact during mold opening is reduced, and the mold closing force is adjusted more quickly and easily. The mold closing mechanism of the two-plate injection molding machine mainly comprises a front mold plate, a movable mold plate, a mold locking oil cylinder, a fast moving mold oil cylinder, a pull rod and a band-type brake mechanism.
When the movable template works, the movable template is driven by the mold moving oil cylinder and the mold opening and closing mechanism at the same time, moves towards the mold along the direction of the pull rod, is fixed on the mechanism, and then is locked by the movable template, the mold and the fixed template through the mold moving oil cylinder, and provides a mold locking force. The motion and dynamic characteristics of a die assembly mechanism of the two-plate injection molding machine consisting of the movable die plate and the fixed die plate are more reasonable, and various sensors, micro control technologies and hydraulic systems are matched, so that the two-plate injection molding machine is quite excellent in stress and precision.
At present, the dynamic characteristic measurement of the template by an injection molding machine manufacturer can only be tested by the traditional hoisting and some simple testing tools, and then is analyzed and calculated by a relevant mathematical theory. In the working process of the actual template, the template can receive huge mold locking force and injection molding force which are loaded circularly, and the influence on the template is large. In the simple hoisting test, the characteristics of the body of the movable template during hoisting can only be measured singly, the dynamic characteristics of the whole working process of the template cannot be measured, and a better obtaining mode is not provided for different dynamic characteristics under different working conditions during moving, locking and opening the mold. The measurement is limited greatly, and under having broken away from operating condition, often the data of testing are also not accurate enough, rock moreover to the work piece, can't fix the scheduling situation and can't solve, are unfavorable for the template to find the problem in the test, can't avoid in advance.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the measuring system and the method for obtaining the vibration dynamic characteristics of the movable template of the injection molding machine, the dynamic characteristics of the movable template under different working conditions in the whole working process of the injection molding machine are accurately measured, a test simulation environment system is closer to the actual working condition, the measuring precision is high, and the operation is simple.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a measuring system for obtaining vibration dynamic characteristics of a movable template of an injection molding machine comprises the movable template, a special fixed template for detection, a template displacement device, a special mold for detection, a pushing power device, a force sensor, a vibration exciter, a vibration meter and a measurement and control system, wherein the movable template and the special fixed template for detection are sequentially and oppositely arranged along the longitudinal direction, the template displacement device is respectively connected with the movable template and the special fixed template for detection, the template displacement device is used for adjusting the relative position between the movable template and the special fixed template for detection, the pushing power device is connected with the movable template, the pushing power device is used for providing a mold locking force during mold closing, the special mold for detection is arranged between the movable template and the special fixed template for detection, the force sensor is arranged on the special mold for detection, the vibration meter and the vibration exciter are arranged on one side of the movable template and connected with the movable template, and the measurement and control system is respectively connected with the vibration exciter, the vibration meter, the force sensor, the vibration meter and the force sensor, The pushing power device is connected with the template displacement device.
According to the technical scheme, the detection special die comprises two opposite detection special dies, the two detection special dies are respectively arranged on the inner side surfaces of the movable die plate and the fixed die plate, and the force sensor is arranged on one of the detection special dies and arranged between the two detection special dies.
According to the technical scheme, the template displacement device comprises a linear guide rail, two platforms, a first lead screw and a first motor, the linear guide rail is arranged along the longitudinal direction, the two platforms are respectively a first platform and a second platform, the first platform is arranged on the linear guide rail, the movable template and the special fixed template for detection are respectively arranged on the first platform and the second platform, the first motor is connected with the first platform through the first lead screw, the first motor drives the first platform to move back and forth along the linear guide rail through the first lead screw, the movable template is connected with the first platform through a pushing-closing power device, and the first motor is connected with the measurement and control system.
According to the technical scheme, the fixed template special for detection is connected with the pull rod, the movable template is sleeved on the pull rod, and the movable template moves back and forth along the pull rod.
According to the technical scheme, the pushing power device comprises a second motor, a transmission mechanism and a ball screw pair, the second motor is connected with the ball screw pair through the transmission mechanism, the ball screw pair is connected with the movable template, and the second motor is arranged on the first platform.
According to the technical scheme, the ball screw assembly comprises the second screw and the second screw nut, the second motor is connected with one end of the second screw through the transmission mechanism, the second screw nut is sleeved on the second screw, and the second screw nut is connected with the movable template.
According to the technical scheme, the transmission mechanism comprises a small gear, a large gear, a transmission shaft and a coupling, the small gear is connected with an output shaft of the second motor, the small gear is meshed with the large gear, the large gear is connected with the transmission shaft, the transmission shaft is connected with the second lead screw through the coupling, and the second motor drives the second lead screw sequentially through the small gear, the large gear and the transmission shaft.
According to the technical scheme, the vibration meter is a laser Doppler vibration meter, and a laser beam of the laser Doppler vibration meter irradiates on the movable template.
According to the technical scheme, the measuring system for obtaining the vibration dynamic characteristics of the movable template of the injection molding machine further comprises a special injection molding device for detection, the special injection molding device for detection is fixedly arranged on the special fixed template for detection, and the special injection molding device for detection is connected with an injection molding hole of the special mold for detection through a pipeline and is used for providing injection molding force when the two templates are closed.
According to the technical scheme, the special injection molding device comprises the hydraulic cylinder, the hydraulic cylinder is connected with the injection molding hole of the special detection mold through a pipeline, and the injection molding hole in the fixed mold plate is used for injecting oil liquid into the special detection mold to simulate injection molding force and also can be used for extracting the oil liquid.
According to the technical scheme, the measurement and control system comprises a data acquisition system and a computer, and the computer is respectively connected with the force sensor, the vibration exciter and the vibration meter through the data acquisition system.
The measuring method of the measuring system for obtaining the vibration dynamic characteristic of the movable template of the injection molding machine comprises the following steps:
1) the template displacement device drives the movable template to move towards the fixed template special for detection, so that the movable template and the fixed template special for detection are matched;
2) the pushing power device applies a mold locking force to the movable template, and the movable template and the special fixed template for inspection are locked;
3) injecting liquid into the special detection mold through the special detection injection molding device to simulate the injection molding process;
4) liquid is pumped back from the special detection mold through the special detection injection molding device, the mold locking force is withdrawn by the pushing power device, the movable mold plate is driven by the mold plate displacement device to be separated from the special detection fixed mold plate, and mold opening is carried out;
5) in the whole processes of die assembly, die locking and die opening, the measurement and control system outputs certain vibration force to the movable die plate through the vibration exciter to form an input excitation signal, the measurement and control system detects the die locking force and the injection force of the special die in real time through the force sensor, and the measurement and control system measures and analyzes the vibration response signal of the movable die plate through the vibration measurer;
6) obtaining a frequency response function curve of the moving template so as to obtain a modal frequency parameter of the moving template;
7) and obtaining the vibration dynamic characteristics of the movable template.
The invention has the following beneficial effects:
the invention carries out die assembly and die locking on the movable template and the fixed template by simulating the actual working condition of the movable template during working, simulates the huge die locking force received by the movable template of the injection molding machine during die locking, simultaneously simulates the injection force received during injection molding, and accurately controls the magnitude of the force received by the template through a force sensor and data acquisition feedback, can accurately measure the dynamic characteristics of the movable template under different working conditions in the whole working process of the simulation injection molding machine, is applied to the working conditions of moving, die assembly, die locking and die opening of the movable template in a simulation way, is beneficial to finding the possible problems of the movable template in the whole working process, avoids in advance, is convenient for design iteration of factories, and develops products with more excellent performance; the test environment system is closer to the actual working condition, the measurement precision is high, and the operation is simple.
Drawings
FIG. 1 is an elevation view of a measurement system for obtaining vibration dynamics of a movable platen of an injection molding machine in an embodiment of the present invention;
FIG. 2 is a view in the direction A of FIG. 1;
FIG. 3 is a front view of a measurement system for obtaining vibration dynamics of a movable platen of an injection molding machine in an embodiment of the present invention;
FIG. 4 is a bottom view of FIG. 3;
FIG. 5 is a schematic diagram of the operation of the measurement system for obtaining the dynamic vibration characteristics of the movable mold plate of the injection molding machine according to the embodiment of the present invention;
in the figure, 1-a guide rail, 2-a magnetic torque motor, 3-a motor base, 4-a laser Doppler vibrometer, 5-an output shaft, 6-a pinion, 7-a transmission shaft, 8-a gearwheel, 9-a gear box, 10-a pull rod, 11-a detection special fixed template, 12-a movable template, 13-a right detection special mold, 14-a detection special injection molding device, 15-a first motor controller, 16-a computer, 17-a data acquisition card, 18-a second motor controller, 19-a left detection special mold, 20-an excitation hammer, 21-a force sensor, 22-a stepping motor, 23-a first lead screw, 24-a first lead screw nut, 25-a lead screw bracket, 26-a coupler and 27-a second lead screw, 28-second lead screw nut.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 5, a measuring system for obtaining vibration dynamic characteristics of a movable mold plate of an injection molding machine in one embodiment of the invention includes a movable mold plate 12, a fixed mold plate 11 for detection, a mold plate displacement device, a mold plate for detection, a pushing power device, a force sensor 21, a vibration exciter, a vibration meter and a measurement and control system, the movable mold plate 12 and the fixed mold plate 11 for detection are sequentially arranged along a longitudinal direction, the mold plate displacement device is respectively connected with the movable mold plate 12 and the fixed mold plate 11 for detection, the mold plate displacement device is used for adjusting a relative position between the movable mold plate 12 and the fixed mold plate 11 for detection, a mold closing and opening process of the movable mold plate 12 and the fixed mold plate 11 for detection is simulated, the pushing power device is connected with the movable mold plate 12, the pushing power device is used for providing mold locking force during mold closing, a mold locking process after mold closing is simulated, the mold for detection is arranged between the movable mold plate 12 and the fixed mold plate 11 for detection, the force sensor 21 is arranged on the special detection die, the vibration meter and the vibration exciter are arranged on one side of the movable die plate 12 and connected with the movable die plate 12, and the measurement and control system is respectively connected with the vibration exciter, the vibration meter, the force sensor 21, the pushing-in power device and the die plate displacement device.
Further, the detection special dies comprise two detection special dies which are oppositely arranged, namely a left detection special die 19 and a right detection special die 13, the two detection special dies are respectively arranged on the inner side surfaces of the movable die plate 12 and the fixed die plate, and the force sensor 21 is arranged on one of the detection special dies and is arranged between the two detection special dies.
Further, the template displacement device comprises a linear guide rail 1, two platforms, a first lead screw 23 and a first motor, wherein the linear guide rail 1 is arranged longitudinally, the two platforms are respectively a first platform and a second platform, the first platform is arranged on the linear guide rail 1, a movable template 12 and a special detection fixed template 11 are respectively arranged on the first platform and the second platform, the first motor is connected with the first platform through the first lead screw 23, the first motor drives the first platform to move back and forth along the linear guide rail 1 through the first lead screw 23, the movable template 12 is connected with the first platform through a pushing power device, and the first motor is connected with the measurement and control system.
Further, first lead screw 23 is fixedly connected through lead screw bracket 25, first lead screw 23 is sleeved with first lead screw nut 24, and first lead screw nut 24 is connected with the first platform.
Further, when the first lead screw 23 is connected with only the first platform, the second platform is fixed, when the first lead screw 23 is connected with the two platforms at the same time, the first platform and the second platform are sequentially arranged on the linear guide rail 1, and the stepping motor 22 drives the two platforms to move oppositely along the linear guide rail 1 through the first lead screw 23.
Further, the number of the linear guide rails 1 is two, and the two linear guide rails 1 are arranged in parallel side by side.
Further, the first motor is a stepper motor 22.
Furthermore, a pull rod 10 is connected to the fixed template 11 special for detection, a movable template 12 is sleeved on the pull rod 10, and the movable template 12 moves back and forth along the pull rod 10; the tie rods 10 act as guides to guide the movement and accuracy of the position of the die plate.
Further, the number of the pull rods 10 is four, and the four pull rods 10 are arranged at four corners of the fixed die plate in parallel.
Further, the pushing power device comprises a second motor, a transmission mechanism and a ball screw pair, the second motor is connected with the ball screw pair through the transmission mechanism, the ball screw pair is connected with the movable template 12, and the second motor is arranged on the first platform.
Further, the ball screw assembly comprises a second screw 27 and a second screw nut 28, the second motor is connected with one end of the second screw 27 through a transmission mechanism, the second screw nut 28 is sleeved on the second screw 27, and the second screw nut 28 is connected with the movable template 12; the second motor drives the second lead screw 27 through the transmission mechanism, and applies locking force to the movable die plate 12 through the second lead screw nut 28.
Further, the transmission mechanism comprises a pinion 6, a gearwheel 8, a transmission shaft 7 and a coupling 26, the pinion 6 is connected with an output shaft 5 of the second motor, the pinion 6 is meshed with the gearwheel 8, the gearwheel 8 is connected with the transmission shaft 7, the transmission shaft 7 is connected with a second lead screw 27 through the coupling 26, and the second motor drives the second lead screw 27 sequentially through the pinion 6, the gearwheel 8 and the transmission shaft 7.
Further, the push-fit power device is a magnetic torque motor power device, and the second motor is a magnetic torque motor 2.
Further, the vibration meter is a laser doppler vibration meter 4, and a laser beam of the laser doppler vibration meter 4 is irradiated on the movable die plate 12.
Further, the laser doppler vibrometer 4 is arranged on the first platform, the number of the laser doppler vibrometer 4 is two, and the two laser doppler vibrometers are symmetrically arranged on two sides of the second motor
Further, the exciter is a vibration exciter 20.
Furthermore, the measurement system for obtaining the vibration dynamic characteristics of the movable mold plate of the injection molding machine further comprises a special detection injection molding device 14, the special detection injection molding device 14 is fixedly arranged on the special detection fixed mold plate 11, and the special detection injection molding device 14 is connected with an injection molding hole of the special detection mold through a pipeline and used for providing injection molding force when the two mold plates are closed.
Furthermore, the injection molding device 14 for detection comprises a hydraulic cylinder, the hydraulic cylinder is connected with an injection molding hole of the special detection mold through a pipeline, and the injection molding force is simulated by injecting oil into the special detection mold through the injection molding hole on the fixed mold plate, so that the oil can be extracted.
Further, the measurement and control system comprises a data acquisition system and a computer 16, and the computer 16 is respectively connected with the force sensor 21, the vibration exciter and the vibration meter through the data acquisition system.
The measuring method of the measuring system for obtaining the vibration dynamic characteristic of the movable template of the injection molding machine comprises the following steps:
1) the template displacement device drives the movable template 12 to move towards the fixed template 11 special for detection, so that the movable template 12 and the fixed template special for detection are matched;
2) the pushing power device applies a mold locking force to the movable mold plate 12, and mold locking is carried out on the movable mold plate 12 and the fixed mold plate special for inspection;
3) injecting liquid into the special detection mold through the special detection injection molding device 14 to simulate an injection molding process; providing sufficient injection molding force;
4) liquid is pumped back from the special detection mold through the special detection injection molding device 14, the mold locking force is withdrawn by the pushing power device, the movable mold plate 12 is driven by the mold plate displacement device to be separated from the special detection fixed mold plate, and mold opening is carried out;
5) in the whole processes of die assembly, die locking and die opening, the measurement and control system outputs certain vibration force to the movable die plate 12 through the vibration exciter to form an input excitation signal, the measurement and control system detects the die locking force and the injection force of the special die in real time through the force sensor 21, and the measurement and control system measures and analyzes the vibration response signal of the movable die plate 12 through the vibration measurer;
6) obtaining a frequency response function curve of the movable template 12, thereby obtaining a modal frequency parameter of the movable template 12;
7) that is, the vibration dynamics of the movable die plate 12 is obtained.
Further, the frequency response function is a frequency response function curve corresponding to a vibration response obtained by hammering and exciting the movable die plate 12; frequency response function: frequency response the amplitude, real and imaginary part curves of the frequency response function can be shown using the frequency response function.
The modal frequency parameters are modal parameters of each order of the movable template 12 and comprise vibration modal frequency, damping ratio and vibration mode description; the modal frequency parameters specifically include vibration modal frequency, damping ratio and mode shape description.
Further, the liquid is oil liquid.
In an embodiment of the invention, referring to fig. 1 and fig. 2, a measuring system for obtaining vibration dynamic characteristics of a movable mold plate of an injection molding machine comprises a movable mold plate 12 of the injection molding machine, a magnetic torque motor power device, a mold plate displacement system, a special detection fixed mold plate 11, a special detection injection molding device 14, a special detection mold, a pull rod 10, a measurement and control system and a data acquisition system; the magnetic moment motor power device, the vibration meter 4, the movable template 12, the special detection fixed template 11 and the measurement and control system are respectively arranged on the template displacement system, the movement of the modules can be controlled by the template displacement system, the relative position distance can be adjusted, and the mold closing process can be simulated; the pull rod 10 plays a role in guiding to control the accuracy of the movement and the position of the template; the power device of the magnetic torque motor 2 is connected with the movable template to simulate the mold locking process to provide mold locking force; the special detection injection molding device is arranged behind the fixed mold plate 11 and is connected with the fixed mold plate 11, the special detection mold is arranged between the movable mold plate 12 and the special detection fixed mold plate 11, and the movable mold plate and the special detection fixed mold plate are combined to provide injection molding force during mold closing; the two motor controllers are respectively a stepping motor 22 and a magnetic torque motor 2.
Further, the template displacement system comprises two guide rails 1, a first lead screw 23, a stepping motor 22 and a lead screw bracket 25, wherein the stepping motor 22 can control the longitudinal movement of the detection module to adjust the position of the module.
Further, the guide rail 1 is a linear guide rail, the number of the linear guide rails is two, and the two linear guide rails are arranged in parallel side by side.
Furthermore, the number of the pull rods 10 is four, and the pull rods are connected to the pull rod holes of the detection-dedicated fixed die plate and the detection-dedicated movable die plate and fixed on the detection-dedicated fixed die plate.
Further, the magnetic torque motor device is arranged on the template displacement system and comprises a magnetic torque motor 2, a magnetic torque motor fixing base 3, a large gear 8, a small gear 6, a gear box 9, an output shaft 5, a transmission shaft 7, a coupler 26, a second lead screw 27 and a second lead screw nut 28, wherein the magnetic torque motor 2 is placed on the magnetic torque motor fixing base 3, the magnetic torque motor is connected with the small gear 6 through the output shaft 5, the small gear is meshed with the large gear 8, the large gear 8 is connected with the transmission shaft 7, the transmission shaft 7 is connected with the second lead screw 27 through the coupler 26, the second lead screw nut 28 is connected with the second lead screw nut 27, the second lead screw nut 28 is installed at the center of the movable template 12, the gear box 9 is used for maintaining stable operation of the gear set and fixing the position, and the magnetic torque motor device provides a mold locking force for the movable template.
Further, the detection dedicated dies are a left detection dedicated die 19 and a right detection dedicated die 13, respectively, the left detection dedicated die 19 is mounted at the center position of the movable die plate 12, and the right detection dedicated die 13 is mounted at the center position of the detection dedicated fixed die plate 11.
Further, the vibration meter 4 is a laser doppler vibration meter, the laser doppler vibration meter is arranged on two sides of the magnetic torque motor 2, the number of the laser doppler vibration meters is two, and laser of the laser doppler vibration meter is just hit on the surface of the movable template.
Furthermore, the special simulation injection molding device 14 for detection is connected with the special fixed mold plate 11 for detection, and oil can be injected into the special detection mold after mold locking through injection molding holes in the fixed mold plate to provide simulated injection molding force.
Further, the data acquisition system and the measurement and control system comprise a force sensor 21, a vibration measuring hammer 20, a laser Doppler vibration measuring instrument 4, a data acquisition card 17 and a computer 16, wherein the force sensor 21 is respectively arranged on the loading surface of the movable template 12 and the inner surface of the right detection special mold 13, the force sensor is connected with the data acquisition card 17 to respectively obtain the magnitude of the mold locking force and the magnitude of the injection molding force in real time, the data acquisition card 17 is connected with the laser Doppler vibration measuring instrument 4, the data acquisition card is connected with the computer 16, and measurement and control software is arranged in the computer.
Further, the computer is connected with the magnetic torque motor 2 and the stepping motor 22 through the second motor controller 18 and the first motor controller 15, respectively, the second motor controller 18 controls the operation of the magnetic torque motor 2, and the first motor controller 15 controls the operation of the stepping motor 22.
The measuring method of the system for the vibration dynamic characteristic of the movable injection molding machine movable mold plate comprises the following steps:
(1) firstly, finite element simulation analysis is carried out on the movable mould plate of the injection molding machine, and a basis is provided for actually measuring the mode of the movable mould plate of the injection molding machine. The method is characterized in that ANSYS is used for simulating the movable template, a model of the movable template is established in software, material parameters are added, the movable template is made of QT500-7A nodular cast iron, and the material parameters are shown in the table:
QT500-7A Material Properties
| Name of Material | QT500-7A |
| Density (Kg/m ^3) | 7200 |
| Poisson ratio | 0.275 |
| Elastic modulus E (N/m ^2) | 1.69E11 |
The grid division is freely divided by software, the set quality is high, the grid size is 10.0mm, and a grid division model is obtained, wherein the number of units is 813915, and the number of nodes is 1225142. And adding a minimum mould surface at the center of the template, applying mould locking force of about 16000KN, carrying out fixed constraint on the constraint position and the bottom surface of the pull rod, and setting a 16-order mode as an output result. And calculating to obtain a simulation result of the mode, wherein the 7 th-12 th order mode loaded by the movable template is shown in the following table.
(2) And (3) mounting: the movable template 12 is arranged in a platform at a given position, the movable template is arranged on the platform along the pull rod 10, the left detection special mold 19 is arranged on the front surface of the movable template 11, and the ball screw pair 2 in the magnetic torque motor power device is arranged on the other side of the movable template. The laser Doppler vibration meters 4 are arranged on two sides of the magnetic torque motor 2 and are symmetrically arranged.
(3) Starting a detection system:
moving the mold: the first motor controller 15 starts the stepping motor 22 to move the movable die plate 12 along the guide rail 1 and the pull rod 10 through the first lead screw 23 and the guide rail 1, so that the detection-dedicated die is tightly embedded left and right.
And (3) mode locking: the magnetic torque motor 2 is started through the second motor controller 18, the pinion 6 moves and transmits torque through the output shaft 5, the pinion 6 is meshed with the gearwheel 8 in the gear box 9, the gearwheel moves to drive the transmission shaft 7 to move, simulated mold locking force is applied to the movable mold plate 12, and the mold locking force is controlled to reach an actual value through the second motor controller 18 and the force sensor 21. The injection molding device 14 for detection inputs oil into the special detection mold in a mode locking state to provide enough injection molding force, and the oil is detected by a force sensor 21, acquired by a data acquisition card 17 and controlled by a computer 16 to reach a set value.
Opening the mold: under the condition of locking the mold, the injection molding device 14 for detection pumps oil liquid into the special detection mold in the mold locking state, the injection force is cancelled, the magnetic torque motor 2 is reversely started through the second motor controller 18, the pinion 6 moves and transmits torque through the output shaft 5, the pinion 6 is meshed with the bull gear 8 in the gear box 9, the bull gear moves, the transmission shaft 7 is driven to move, the left special detection mold 19 and the right special detection mold 13 are separated left and right, and mold opening is carried out.
(4) The exciting hammer 20 outputs a certain vibration force to the movable template 12, the vibration signal of the movable template 12 is measured and analyzed by the laser Doppler vibrometer 4, and the obtained data and analysis are output by the computer 16 to obtain the dynamic characteristic of the movable template.
The data acquisition and analysis system comprises: the experiment uses a laser Doppler vibration meter to develop by adopting a signal module and a data analysis module, and the program comprises five parts of signal acquisition, signal filtering, signal analysis and processing, signal display and data storage. A schematic diagram of the data acquisition and analysis system is shown in fig. 5.
1. Signal acquisition: the laser emitted by the laser Doppler vibration meter is used for testing each test point through the laser head, adjusting and setting appropriate sensitivity, setting sampling frequency and sampling point number, ensuring that the vibration measuring hammer generates an acquired signal to cover the whole vibration to a stable response process every time the vibration measuring hammer knocks, acquiring a vibration excitation signal generated by knocking in the acquisition card, and uploading the vibration excitation signal to the computer.
2. Signal filtering: because the measured acquisition signal is a time-varying parameter, filtering processing is carried out by using a Kalman filter in order to remove noise generated during acquisition, so that the extraction of the original vibration signal is realized, and the amplified and filtered signals are superposed and then enter a computer for analysis through a data acquisition card.
3, signal analysis and processing: the modal analysis is mainly characterized in that the physical coordinates of a differential equation set of linear time invariant system vibration are converted into modal coordinates, the equation set is decoupled to form a set of independent equations described by the modal coordinates and modal parameters, a transformation matrix of coordinate transformation is a mode shape matrix, and each column of the transformation matrix is each order of mode shape. The system inputs an input signal and a vibration response signal, performs Fourier transform on the input excitation signal and the vibration response signal respectively, and calculates to obtain a moving template frequency response function curve and a related function curve, so as to obtain a modal frequency parameter.
4. Signal display: and finally, calculating by a computer and obtaining the dynamic characteristics and real-time data for displaying the mold locking force and the injection molding force by using related software.
5. And (3) data storage: and storing the data by using a tool kit of the written database access signal acquisition module and the data analysis module through a computer.
The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.
Claims (9)
1. A measuring system for obtaining vibration dynamic characteristics of a movable template of an injection molding machine is characterized by comprising the movable template, a special fixed template for detection, a template displacement device, a special detection mold, a pushing power device, a force sensor, a vibration exciter, a vibration meter and a measurement and control system, wherein the movable template and the special fixed template for detection are arranged oppositely, the template displacement device is respectively connected with the movable template and the special fixed template for detection, the template displacement device is used for adjusting the relative position between the movable template and the special fixed template for detection, the pushing power device is connected with the movable template, the pushing power device is used for providing a mold locking force during mold closing, the special detection mold is arranged between the movable template and the special fixed template for detection, the force sensor is arranged on the special detection mold, the vibration meter and the vibration exciter are arranged on one side of the movable template and connected with the movable template, and the measurement and control system is respectively connected with the vibration exciter, the vibration meter and the vibration meter, The force sensor, the pushing power device and the template displacement device are connected;
the measuring system for obtaining the vibration dynamic characteristic of the movable template of the injection molding machine further comprises a special injection molding device for detection, wherein the special injection molding device for detection is fixedly arranged on the special fixed template for detection, and is connected with an injection molding hole of the special mold for detection;
the measurement and control system detects the mold locking force and the injection force borne by the special mold in real time through a force sensor, and measures and analyzes the vibration response signal of the movable mold plate through a vibration meter; obtaining a frequency response function curve of the moving template so as to obtain a modal frequency parameter of the moving template; and solving the vibration dynamic characteristics of the movable template, and accurately measuring the dynamic characteristics of the movable template under different working conditions in the whole working process of the injection molding machine.
2. The system for measuring vibration dynamics of a movable mold plate of an injection molding machine according to claim 1, wherein the detection dedicated mold comprises two detection dedicated molds disposed opposite to each other, the two detection dedicated molds are disposed on inner side surfaces of the movable mold plate and the fixed mold plate, respectively, and the force sensor is disposed on one of the detection dedicated molds and disposed between the two detection dedicated molds.
3. The system for measuring vibration dynamics of a movable mold plate of an injection molding machine according to claim 1, wherein the mold plate displacement device comprises a linear guide, two platforms, a first lead screw and a first motor, the linear guide is arranged along a longitudinal direction, the two platforms are respectively a first platform and a second platform, the first platform is arranged on the linear guide, the movable mold plate and the fixed mold plate special for detection are respectively arranged on the first platform and the second platform, the first motor is connected with the first platform through the first lead screw, the first motor drives the first platform to move back and forth along the linear guide through the first lead screw, the movable mold plate is connected with the first platform through a pushing power device, and the first motor is connected with the measurement and control system.
4. The system of claim 3, wherein the fixed mold plate is connected to a pull rod, the movable mold plate is sleeved on the pull rod, and the movable mold plate moves back and forth along the pull rod.
5. The system for measuring vibration dynamic characteristics of the movable mold plate of the injection molding machine according to claim 3 or 4, wherein the pushing power device comprises a second motor, a transmission mechanism and a ball screw pair, the second motor is connected with the ball screw pair through the transmission mechanism, the ball screw pair is connected with the movable mold plate, and the second motor is arranged on the first platform.
6. The system for measuring vibration dynamic characteristics of the movable mold plate of the injection molding machine according to claim 5, wherein the ball screw assembly comprises a second screw and a second screw nut, the second motor is connected with one end of the second screw through a transmission mechanism, the second screw nut is sleeved on the second screw, and the second screw nut is connected with the movable mold plate.
7. The system for measuring vibration dynamics of a movable mold plate of an injection molding machine according to claim 6, wherein the transmission mechanism comprises a small gear, a large gear, a transmission shaft and a coupling, the small gear is connected with an output shaft of the second motor, the small gear a is engaged with the large gear, the large gear is connected with the transmission shaft, the transmission shaft is connected with the second lead screw through the coupling, and the second motor drives the second lead screw sequentially through the small gear, the large gear and the transmission shaft.
8. The system for obtaining the dynamic vibration characteristics of the movable mold plate of the injection molding machine according to claim 1, wherein the vibration meter is a laser doppler vibration meter, and a laser beam of the laser doppler vibration meter is irradiated on the movable mold plate.
9. A measuring method using the measuring system for obtaining the vibration dynamic characteristics of the movable mold plate of the injection molding machine according to claim 1, characterized by comprising the following steps:
1) the template displacement device drives the movable template to move towards the fixed template special for detection, so that the movable template and the fixed template special for detection are matched;
2) the pushing power device applies a mold locking force to the movable template, and the movable template and the special fixed template for inspection are locked;
3) injecting liquid into the special detection mold through the special detection injection molding device to simulate the injection molding process;
4) liquid is pumped back from the special detection mold through the special detection injection molding device, the mold locking force is withdrawn by the pushing power device, the movable mold plate is driven by the mold plate displacement device to be separated from the special detection fixed mold plate, and mold opening is carried out;
5) in the whole process of closing, locking and opening the mold, the measurement and control system outputs a certain vibration force to the movable template through the vibration exciter to form an input excitation signal, the measurement and control system detects the locking force and the injection force applied to the special mold in real time through the force sensor, and the measurement and control system measures and analyzes the vibration response signal of the movable template through the vibration measurer;
6) obtaining a frequency response function curve of the moving template so as to obtain a modal frequency parameter of the moving template;
7) and obtaining the vibration dynamic characteristics of the movable template.
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| JP2667521B2 (en) * | 1989-07-04 | 1997-10-27 | 住友重機械工業株式会社 | Resin pressure detector for injection molding machine |
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| US20130147077A1 (en) * | 2011-12-09 | 2013-06-13 | National Taiwan University Of Science And Technology | In-mold vibratile injection compression molding method and molding apparatus thereof |
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