CN116380309A - Mode locking force measuring method, measuring system and measuring device - Google Patents
Mode locking force measuring method, measuring system and measuring device Download PDFInfo
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- CN116380309A CN116380309A CN202310358388.1A CN202310358388A CN116380309A CN 116380309 A CN116380309 A CN 116380309A CN 202310358388 A CN202310358388 A CN 202310358388A CN 116380309 A CN116380309 A CN 116380309A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
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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
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Abstract
The invention relates to the technical field of mold locking force measurement, in particular to a mold locking force measurement method, a mold locking force measurement system and a mold locking force measurement device. According to the measuring method, the ultrasonic wave transmitting module is excited by the generated pulse signal to generate ultrasonic waves, the ultrasonic waves penetrate through the tie bar and are received by the ultrasonic wave receiving module and are converted into electric signals, the transmission time of the ultrasonic waves in the tie bar is calculated according to the time difference between the transmitted signals and the received signals, then the transmission time of the ultrasonic waves in the tie bar is corrected through temperature, and then the stress value of the tie bar is calculated according to the corrected transmission time. The measuring method, the measuring system and the measuring device can stably and accurately test the stress condition of the tie bar, and the device has good environmental adaptability and can be stably used for a long time.
Description
Technical Field
The invention relates to the technical field of mold locking force measurement, in particular to a mold locking force measurement method, a mold locking force measurement system and a mold locking force measurement device.
Background
The mold locking force is the locking force applied to the mold by the injection machine in order to overcome the expanding force of the melt in the cavity to the mold during injection. The injection principle of the injection molding machine is that plastic in a plasticized molten state is injected into a closed mold cavity by means of the thrust of a screw rod, and the plastic is solidified and shaped to finish manufacturing. When the material is injected into the cavity of the injection molding machine at high pressure, a mold-stretching force is generated, so that the mold-locking unit of the injection molding machine must provide a sufficient "mold-locking force" to prevent the mold from being stretched. The tie bar is used as a main part for providing the mold locking force for the injection molding machine, and the stress condition of the tie bar directly reflects the magnitude of the mold locking force, so that the measurement of the stress condition of the tie bar directly relates to the production link and the quality of the finished product.
At present, a common stress sensor is used for monitoring stress of a tie rod, and the stress sensor is attached to the outer side of the tie rod for sensing. However, the data detected by the detection mode is inaccurate, and the installation is unstable and easy to fall off, so that the normal use is affected.
Disclosure of Invention
The invention provides a mode locking force measuring method, a measuring system and a measuring device, which solve the problem of inaccurate mode locking force data measurement in the prior art.
According to a first aspect, in one embodiment, a method for measuring a clamping force is provided, including:
the method comprises the steps of controlling to generate a plurality of pulse signals, and sending the pulse signals to an ultrasonic wave transmitting module, wherein the pulse signals are used for exciting the ultrasonic wave transmitting module to generate ultrasonic waves;
the ultrasonic receiving module receives the ultrasonic wave and converts the ultrasonic wave into an electric signal;
processing the electric signal to obtain the transmission time of the ultrasonic wave in the tie bar;
acquiring a temperature value of the tie bar;
correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value;
and calculating the stress value of the tie bar according to the corrected transmission time.
In one possible implementation manner, the processing the electrical signal to obtain a transmission time of the ultrasonic wave in the tie bar includes:
acquiring a first time point when the pulse signal is sent;
acquiring a second time point when the electric signal is received;
calculating a time difference between the first time point and the second time point, wherein the time difference is used for representing the transmission time of the ultrasonic wave in the tie bar.
In one possible embodiment, the correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value includes:
calculating the propagation speed of the ultrasonic wave in the tie bar according to the temperature value;
correcting the transmission time of the ultrasonic wave in the tie bar according to the transmission speed of the ultrasonic wave in the tie bar.
In one possible implementation manner, the calculating the stress value of the tie bar according to the corrected transmission time includes:
establishing a relation among the temperature value, the transmission time and the stress value by a calibration method;
calculating the stress value of the tie bar according to a fitting algorithm; the calculation formula is as follows:
N＝f(T,△t)；
wherein N is a stress value, T is a temperature value, and Deltat is a transmission time.
In one possible implementation, the fitting algorithm employs a piecewise linear fitting method or a least squares polynomial fitting method.
According to a second aspect, in one embodiment there is provided a mold clamping force measurement system comprising:
the ultrasonic signal transmitting circuit is used for controlling generation of a plurality of pulse signals and transmitting the pulse signals to the ultrasonic transmitting module, and the pulse signals are used for exciting the ultrasonic transmitting module to generate ultrasonic waves;
an ultrasonic signal receiving circuit for receiving the ultrasonic wave and converting the ultrasonic wave into an electric signal;
the time measurement module is used for processing the electric signals to obtain the transmission time of the ultrasonic waves in the tie bar;
the temperature measurement module is used for detecting the temperature value of the tie bar;
the control module is used for correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value; and the method is also used for calculating the stress value of the tie bar according to the corrected transmission time.
In one possible implementation, the time measurement module includes:
a first acquisition unit configured to acquire a first point in time when the pulse signal is transmitted;
a second acquisition unit configured to acquire a second point in time when the electric signal is received;
and the calculating unit is used for calculating a time difference value between the first time point and the second time point, and the time difference value is used for representing the transmission time of the ultrasonic wave in the tie bar.
In one possible embodiment, the measurement system further comprises a power module for providing a regulated voltage to the measurement system.
In one possible implementation manner, the control module corrects the transmission time of the ultrasonic wave in the tie bar according to the temperature value, and includes:
calculating the propagation speed of the ultrasonic wave in the tie bar according to the temperature value;
correcting the transmission time of the ultrasonic wave in the tie bar according to the transmission speed of the ultrasonic wave in the tie bar.
According to a third aspect, in one embodiment there is provided a clamping force measuring device comprising:
an ultrasonic transmitter for transmitting ultrasonic waves according to the pulse signal;
an ultrasonic receiver for receiving ultrasonic waves and converting them into electrical signals;
a collector, comprising:
an ultrasonic signal transmitting circuit for controlling generation of a plurality of pulse signals and transmitting the pulse signals to an ultrasonic transmitter, the pulse signals being used for exciting the ultrasonic transmitter to generate ultrasonic signals;
an ultrasonic signal receiving circuit for acquiring the electrical signal converted by the ultrasonic receiver;
the time measurement module is used for processing the electric signals to obtain the transmission time of the ultrasonic waves in the tie bar;
the temperature measurement module is used for detecting the temperature value of the tie bar;
the control module is used for correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value; and the method is also used for calculating the stress value of the tie bar according to the corrected transmission time.
According to the mode locking force measuring method, the measuring system and the measuring device, the ultrasonic wave transmitting module is excited by the generated pulse signal to generate ultrasonic waves, the ultrasonic waves penetrate through the tie bar and are received by the ultrasonic wave receiving module and are converted into electric signals, the transmission time of the ultrasonic waves in the tie bar is calculated according to the time difference between the transmitted signals and the received signals, then the transmission time of the ultrasonic waves in the tie bar is corrected through temperature, and then the stress value of the tie bar is calculated according to the corrected transmission time. The measuring method, the measuring system and the measuring device can stably and accurately test the stress condition of the tie bar, and the device has good environmental adaptability and can be stably used for a long time.
Drawings
Fig. 1 is a flowchart of a method for measuring a clamping force according to an embodiment of the present application;
FIG. 2 is a flow chart of obtaining transmission time of ultrasonic waves in a tie bar in one embodiment;
FIG. 3 is a flowchart illustrating an embodiment of correcting the transmission time of ultrasonic waves in a tie bar according to a temperature value;
FIG. 4 is a block diagram of a system for measuring clamping force according to an exemplary embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a device for measuring clamping force according to an embodiment of the present application.
Reference numerals: 100. an ultrasonic emitter; 200. an ultrasonic receiver; 300. a temperature sensor; 400. a collector; 410. an ultrasonic signal transmitting circuit; 420. an ultrasonic signal receiving circuit; 430. a time measurement module; 440. a control module; 450. a power module; 460. a comparator; 500. tie bar.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
The prior art monitors the stress of the tie bar and commonly uses the stress sensor, pastes the stress sensor outside the tie bar through a certain structure and directly perceives the stress condition of the tie bar, and experiments show that the data measured by adopting the mode is inaccurate, and the equipment is unstable to install and easy to fall off, thereby affecting the normal use. According to the method, the stress condition of the tie bar is detected through the ultrasonic waves by introducing the ultrasonic waves, so that on one hand, the structure is convenient to install, and the tie bar can be monitored only by being attached to the side face of the tie bar; on the other hand, based on a high-precision time measurement technology, the expansion and contraction condition of the tie bar in the radial direction caused by stress can be identified, so that the stress value of the tie bar can be estimated.
The embodiment of the application provides a mode locking force measurement system, as shown in fig. 4, which includes an ultrasonic signal transmitting circuit 410, an ultrasonic signal receiving circuit 420, a time measurement module 430, a temperature measurement module and a control module 440. The ultrasonic signal transmitting circuit 410 is configured to control generation of a plurality of pulse signals, and send the pulse signals to the ultrasonic transmitting module, where the pulse signals are used to excite the ultrasonic transmitting module to generate ultrasonic waves; the ultrasonic signal receiving circuit 420 is used for receiving ultrasonic waves and converting the ultrasonic waves into electric signals; the time measurement module 430 is configured to process the electrical signal to obtain a transmission time of the ultrasonic wave in the tie bar 500; the temperature measurement module is used for detecting the temperature value of the tie bar 500; the control module 440 is configured to correct a transmission time of the ultrasonic wave in the tie bar 500 according to the temperature value, and calculate a stress value of the tie bar 500 according to the corrected transmission time.
In practical applications, the control module 440 controls the pulse signal generated by the ultrasonic signal transmitting circuit 410, and sends the pulse signal to the ultrasonic transmitting module to excite the ultrasonic transmitting module to generate ultrasonic waves, so that the ultrasonic waves pass through the tie bar 500 and are received by the ultrasonic receiving module, then the ultrasonic receiving module sends the received ultrasonic waves to the ultrasonic signal receiving circuit 420, the ultrasonic receiving circuit converts the ultrasonic waves into electric signals, the ultrasonic signal receiving circuit transmits the electric signals to the time measuring module 430, meanwhile, the control module 440 also sends the pulse signal to the time measuring module 430, the time measuring module 430 processes the electric signals and the pulse signal respectively to obtain the receiving time of the electric signals and the transmitting time of the pulse signal, and makes a difference between the transmitting time and the receiving time to obtain a time difference, and then sends the time difference to the control module 440, wherein the time difference is the transmission time of the ultrasonic waves in the tie bar 500. In addition, the temperature value of the tie bar 500 is detected through the temperature measurement module, the temperature value of the tie bar 500 is specifically detected when the ultrasonic wave passes through the tie bar 500, then the temperature measurement module sends the temperature value to the control module 440, the control module 440 corrects the time difference according to the temperature value, and then the stress value of the tie bar 500 is calculated according to the corrected time difference.
As a further improvement of the present embodiment, the time measurement module 430 includes a first acquisition unit, a second acquisition unit, and a calculation unit. The first acquisition unit is used for acquiring a first time point when the pulse signal is transmitted; the second acquisition unit is used for acquiring a second time point when the electric signal is received; the calculating unit is configured to calculate a time difference between the first time point and the second time point, where the time difference is used to characterize a transmission time of the ultrasonic wave in the tie bar 500.
Specifically, the first acquiring unit acquires the time when the control module 440 sends the pulse signal as a first time point, the second acquiring unit acquires the time when the ultrasonic signal receiving circuit 420 sends the electric signal as a second time point, the calculating module performs difference on the first time point and the second time point to obtain a time difference value, and the time difference value is sent to the control module 440 again, so that the control module 440 performs the next calculation, wherein the time difference value measured by the time measuring module 430 just represents the transmission time of the ultrasonic wave in the tie bar 500.
Specifically, the ultrasonic signal transmitting circuit 410 in this embodiment adopts an ultrasonic signal transmitting circuit 410 in the prior art, and mainly processes the pulse signal from the control module 440 into a signal meeting the driving capability requirement of the sensor through the driving matching circuit, where the driving capability mainly refers to the voltage amplitude of the pulse signal. The ultrasonic signal receiving circuit 420 in the present embodiment adopts an ultrasonic signal receiving circuit 420 in the prior art, which captures and processes the transmitted ultrasonic signal into a clear and interference-free pulse signal mainly through an amplifying circuit and a filtering circuit, specifically includes amplifying processing and filtering processing, and obtains a high-quality electric signal without clutter interference. The time measurement module 430 used in this embodiment uses a time-to-digital converter, and the time measurement method of the time-to-digital converter can implement high-precision time measurement, and the precision can reach picoseconds, and optionally includes, but is not limited to, a special TDC chip. The temperature measurement module employed in this embodiment employs a temperature sensor 300.
In addition, in this embodiment, a comparator 460 is further connected between the ultrasonic signal receiving module and the time measuring module 430, and the comparator 460 is configured to convert the electrical signal converted by the ultrasonic signal receiving module into a square wave signal through threshold comparison, so that the signal can be directly input into the time measuring module 430, so that the time measuring module 430 can receive and measure the time difference value.
In addition, the measurement system in the present embodiment further includes a power module 450, and the power module 450 is used to provide a stable voltage to the measurement system. Specifically, as shown in fig. 5, the power module 450 is respectively connected to the ultrasonic signal transmitting circuit 410, the ultrasonic signal receiving circuit 420, the time measuring module 430, the control module 440, and the comparator 460, and respectively provides stable voltages for the above modules to ensure that the above modules can work normally. The power module 450 in this embodiment may be powered by a battery or an external voltage.
Referring to fig. 1, an embodiment of the present application provides a method for measuring a clamping force, which is applied to the clamping force measuring system, and the measuring method includes the following steps:
step 1: the method comprises the steps of controlling to generate a plurality of pulse signals, and sending the pulse signals to an ultrasonic wave transmitting module, wherein the pulse signals are used for exciting the ultrasonic wave transmitting module to generate ultrasonic waves;
step 2: the ultrasonic receiving module receives ultrasonic waves and converts the ultrasonic waves into electric signals;
step 3: processing the electric signal to obtain the transmission time of the ultrasonic wave in the tie bar 500;
step 4: acquiring a temperature value of the tie bar 500;
step 5: correcting the transmission time of the ultrasonic wave in the tie bar 500 according to the temperature value;
step 6: and calculating the stress value of the tie bar 500 according to the corrected transmission time.
In use, the ultrasonic transmitter 100 and the ultrasonic receiver 200 are respectively attached to the opposite sides of the tie bar 500, and the ultrasonic transmitter 100 and the ultrasonic receiver 200 are respectively connected to the collector 400. In the present embodiment, the ultrasonic wave transmitting module includes an ultrasonic wave signal transmitting circuit 410 and an ultrasonic wave transmitter 100, and the ultrasonic wave receiving module includes an ultrasonic wave signal receiving circuit 420 and an ultrasonic wave receiver 200. Specifically, a control signal is sent to the ultrasonic signal transmitting circuit 410 through the control module 440, the ultrasonic signal transmitting circuit 410 generates a plurality of pulse signals, the pulse signals are sent to the ultrasonic transmitter 100, the ultrasonic wave transmitting module receives the pulse signals and generates ultrasonic waves, the ultrasonic waves pass through the tie bar 500 and are received by the ultrasonic receiver 200, then the ultrasonic waves are subjected to analog-digital conversion through the ultrasonic signal receiving circuit 420 to obtain electric signals, the electric signals and the pulse signals are processed through the time measuring module 430 to obtain the transmission time of the ultrasonic waves in the tie bar 500, the transmission time is sent to the control module 440 again, then the temperature of the tie bar 500 is detected through the temperature sensor 300, the detected temperature value is sent to the control module 440, and the transmission time of the ultrasonic waves in the tie bar 500 is corrected through the control module 440. Because the propagation speed of the ultrasonic wave in the tie bar 500 is different due to the influence of different temperatures, the present application needs to correct the propagation time according to the influence of temperature on the tie bar 500. Finally, the control module 440 calculates the stress value of the tie bar 500 according to the corrected transmission time. When the tie bar 500 is deformed under stress, the transmission time of the ultrasonic wave will change, and the stress value of the tie bar 500 can be calculated according to the time difference between the time when the tie bar is stressed and the time when the tie bar is not stressed.
In one embodiment, as shown in fig. 2, in step 3, the electrical signal is processed to obtain the transmission time of the ultrasonic wave in the tie bar 500, which specifically includes the following steps:
step 31: acquiring a first time point when a pulse signal is sent;
step 32: acquiring a second time point when the electric signal is received;
step 33: the time difference between the first time point and the second time point is calculated and used for representing the transmission time of the ultrasonic wave in the tie bar 500.
Specifically, the first acquiring unit acquires the time when the control module 440 sends the pulse signal as a first time point, the second acquiring unit acquires the time when the ultrasonic signal receiving circuit 420 sends the electric signal as a second time point, the calculating module performs difference on the first time point and the second time point to obtain a time difference value, and the time difference value is sent to the control module 440 again, so that the control module 440 performs the next calculation, wherein the time difference value measured by the time measuring module 430 just represents the transmission time of the ultrasonic wave in the tie bar 500.
In one embodiment, as shown in fig. 3, in step 5, correcting the transmission time of the ultrasonic wave in the tie bar 500 according to the temperature value includes:
step 51: the speed at which the ultrasonic wave propagates in the tie bar 500 is calculated from the temperature value.
Step 52: the transmission time of the ultrasonic wave in the tie bar 500 is corrected according to the speed at which the ultrasonic wave propagates in the tie bar 500.
In practical applications, as the temperature increases, the propagation speed of the ultrasonic wave in the peg 500 tends to decrease, because the internal structure of the peg 500 is deformed due to the temperature change, that is, the atomic distance inside the peg 500 changes, and the higher the temperature, the larger the atomic distance, the slower the propagation speed (i.e., the smaller the speed value) of the ultrasonic wave, and therefore, the correction of the propagation speed of the ultrasonic wave in the peg 500 is required by the following formula:
wherein C is T For the ultrasonic velocity at temperature T, E T For the elastic modulus of the tie-bar at temperature T, ρ is the density of the tie-bar, μ T Poisson's ratio, μ for the Indian Strand at temperature T T ＝0.3。
After correcting the propagation speed of the ultrasonic wave in the tie bar 500, the propagation time is calculated from the corrected propagation speed. Since the path length value of the ultrasonic wave passing through the tie bar 500 is fixed, the corrected transmission time can be obtained by dividing the path length value by the propagation speed.
In this embodiment, the calculation of the stress value of the tie bar 500 according to the corrected transmission time specifically includes the following steps:
establishing a relation among a temperature value, a transmission time and a stress value by a calibration method;
calculating the stress value of the tie bar 500 according to a fitting algorithm; the fitting algorithm can adopt a piecewise linear fitting method or a least square polynomial fitting method, and the calculation formula is as follows:
N＝f(T,△t)；
wherein N is a stress value, T is a temperature value, and Deltat is a transmission time.
Specifically, the case where the temperature sensor 300 detects the temperature of the tie bar 500 as 20 ℃ will be described taking the transmission time as the independent variable x and the stress value as the dependent variable y as an example. When the transmission time of the ultrasonic wave in the tie bar is detected to be 20ns, the stress value of the tie bar is detected to be 9.5 tons; when the transmission time of the ultrasonic wave in the tie bar is detected to be 11ns, detecting the stress value of the tie bar to be 5 tons; when the transmission time of the ultrasonic wave in the tie bar is detected to be 5ns, the stress value of the tie bar is detected to be 2 tons. Fitting the above example according to the calibration manner, to obtain y=0.5x-0.5, so that the calculation of the stress value of the tie bar 500 can be obtained by measuring the transmission time of the ultrasonic wave in the tie bar and substituting the transmission time into the above formula for calculation. Of course, when performing piecewise linear fitting or least square polynomial fitting by calibration, a large amount of data needs to be measured and recorded, so that the accuracy of the obtained fitting relation can be ensured.
Referring to fig. 5, a device for measuring mold locking force provided in this embodiment includes: an ultrasonic transmitter 100, an ultrasonic receiver 200, and a collector 400. Wherein the ultrasonic transmitter 100 is used for transmitting ultrasonic waves according to the pulse signal; an ultrasonic receiver 200 for receiving ultrasonic waves and converting them into electrical signals; the collector 400 includes an ultrasonic signal transmitting circuit 410, an ultrasonic signal receiving circuit 420, a time measuring module 430, a temperature measuring module and a control module 440, wherein the ultrasonic signal transmitting circuit 410 is used for controlling and generating a plurality of pulse signals, and transmitting the pulse signals to the ultrasonic transmitter 100, and the pulse signals are used for exciting the ultrasonic transmitter 100 to generate ultrasonic signals; the ultrasonic signal receiving circuit 420 is used for acquiring the electric signal converted by the ultrasonic receiver 200; the time measurement module 430 is configured to process the electrical signal to obtain a transmission time of the ultrasonic wave in the tie bar 500; the temperature measurement module is used for detecting the temperature value of the tie bar 500; the control module 440 is configured to correct a transmission time of the ultrasonic wave in the tie bar 500 according to the temperature value, and calculate a stress value of the tie bar 500 according to the corrected transmission time.
In practical applications, an ultrasonic transducer is used in the present embodiment, where one ultrasonic transducer is used for transmitting ultrasonic waves (i.e. the ultrasonic transmitter 100), and the other ultrasonic transducer is used for receiving ultrasonic waves (i.e. the ultrasonic receiver 200), and the selected frequency band is preferably high-frequency ultrasonic waves, including but not limited to 3MHz, and the ultrasonic transmitter 100 and the ultrasonic receiver 200 are respectively placed in a metal housing, and the inside is filled with matched acoustic impedance materials to improve the vibration starting efficiency of the transducer. And meanwhile, the metal shell improves the environmental adaptability of the sensor.
The device for measuring the clamping force in the embodiment specifically comprises an ultrasonic transmitter, an ultrasonic receiver and a collector. The ultrasonic transmitter, the ultrasonic receiver and the collector are described in detail in the above embodiments, and the disclosure is not repeated here.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (10)
1. A method of measuring clamping force, the method comprising:
the method comprises the steps of controlling to generate a plurality of pulse signals, and sending the pulse signals to an ultrasonic wave transmitting module, wherein the pulse signals are used for exciting the ultrasonic wave transmitting module to generate ultrasonic waves;
the ultrasonic receiving module receives the ultrasonic wave and converts the ultrasonic wave into an electric signal;
processing the electric signal to obtain the transmission time of the ultrasonic wave in the tie bar;
acquiring a temperature value of the tie bar;
correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value;
and calculating the stress value of the tie bar according to the corrected transmission time.
2. The method of measuring of claim 1, wherein said processing said electrical signal to obtain a transmission time of said ultrasonic wave in said tie bar comprises:
acquiring a first time point when the pulse signal is sent;
acquiring a second time point when the electric signal is received;
calculating a time difference between the first time point and the second time point, wherein the time difference is used for representing the transmission time of the ultrasonic wave in the tie bar.
3. The measurement method of claim 1, wherein correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value includes:
calculating the propagation speed of the ultrasonic wave in the tie bar according to the temperature value;
correcting the transmission time of the ultrasonic wave in the tie bar according to the transmission speed of the ultrasonic wave in the tie bar.
4. The method of measuring of claim 1, wherein calculating the strain value of the tie bar based on the corrected transmission time comprises:
establishing a relation among the temperature value, the transmission time and the stress value by a calibration method;
calculating the stress value of the tie bar according to a fitting algorithm; the calculation formula is as follows:
N＝f(T,△t)；
wherein N is a stress value, T is a temperature value, and Deltat is a transmission time.
5. The measurement method of claim 4, wherein the fitting algorithm employs a piecewise linear fitting method or a least squares polynomial fitting method.
6. A mold clamping force measurement system, comprising:
the ultrasonic signal transmitting circuit is used for controlling generation of a plurality of pulse signals and transmitting the pulse signals to the ultrasonic transmitting module, and the pulse signals are used for exciting the ultrasonic transmitting module to generate ultrasonic waves;
an ultrasonic signal receiving circuit for receiving the ultrasonic wave and converting the ultrasonic wave into an electric signal;
the time measurement module is used for processing the electric signals to obtain the transmission time of the ultrasonic waves in the tie bar;
the temperature measurement module is used for detecting the temperature value of the tie bar;
the control module is used for correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value; and the method is also used for calculating the stress value of the tie bar according to the corrected transmission time.
7. The measurement system of claim 6, wherein the time measurement module comprises:
a first acquisition unit configured to acquire a first point in time when the pulse signal is transmitted;
a second acquisition unit configured to acquire a second point in time when the electric signal is received;
and the calculating unit is used for calculating a time difference value between the first time point and the second time point, and the time difference value is used for representing the transmission time of the ultrasonic wave in the tie bar.
8. The measurement system of claim 6, further comprising a power module for providing a regulated voltage to the measurement system.
9. The measurement system of claim 6, wherein the control module corrects the transmission time of the ultrasonic wave in the tie bar based on the temperature value, comprising:
calculating the propagation speed of the ultrasonic wave in the tie bar according to the temperature value;
correcting the transmission time of the ultrasonic wave in the tie bar according to the transmission speed of the ultrasonic wave in the tie bar.
10. A mold clamping force measuring device, comprising:
an ultrasonic transmitter for transmitting ultrasonic waves according to the pulse signal;
an ultrasonic receiver for receiving ultrasonic waves and converting them into electrical signals;
a collector, comprising:
an ultrasonic signal transmitting circuit for controlling generation of a plurality of pulse signals and transmitting the pulse signals to an ultrasonic transmitter, the pulse signals being used for exciting the ultrasonic transmitter to generate ultrasonic signals;
an ultrasonic signal receiving circuit for acquiring the electrical signal converted by the ultrasonic receiver;
the time measurement module is used for processing the electric signals to obtain the transmission time of the ultrasonic waves in the tie bar;
the temperature measurement module is used for detecting the temperature value of the tie bar;
the control module is used for correcting the transmission time of the ultrasonic wave in the tie bar according to the temperature value; and the method is also used for calculating the stress value of the tie bar according to the corrected transmission time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310358388.1A CN116380309A (en) | 2023-03-28 | 2023-03-28 | Mode locking force measuring method, measuring system and measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310358388.1A CN116380309A (en) | 2023-03-28 | 2023-03-28 | Mode locking force measuring method, measuring system and measuring device |
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Application publication date: 20230704 |