CN208621219U - Abrasion of grinding wheel on-Line Monitor Device based on grinding resistance square real-time measurement - Google Patents
Abrasion of grinding wheel on-Line Monitor Device based on grinding resistance square real-time measurement Download PDFInfo
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- CN208621219U CN208621219U CN201820723348.7U CN201820723348U CN208621219U CN 208621219 U CN208621219 U CN 208621219U CN 201820723348 U CN201820723348 U CN 201820723348U CN 208621219 U CN208621219 U CN 208621219U
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- 238000005299 abrasion Methods 0.000 title claims abstract description 27
- 238000005259 measurement Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 230000000007 visual effect Effects 0.000 claims abstract description 8
- 238000012806 monitoring device Methods 0.000 claims description 4
- 229910001651 emery Inorganic materials 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 238000003754 machining Methods 0.000 description 6
- 239000011295 pitch Substances 0.000 description 4
- 239000004429 Calibre Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The utility model provides a kind of abrasion of grinding wheel on-line monitoring and warning device based on grinding resistance square real-time measurement, including current sensor, voltage sensor, Data collecting conversion system, Industrial PC Computer, combined aural and visual alarm, speed of mainshaft sensor, feed speed sensor and network transmission system.The utility model passes through the reading to numerical control system operational parameters, obtain the grinding technique parameter of optical element, by in optical element Grinding Process, the measurement of machine tool chief axis servo current, voltage, obtain the active power of main shaft, in conjunction with the measurement to the speed of mainshaft, the grinding resistance square that grinding process medium plain emery wheel is subject to is obtained, to be reflected in the state of wear of current grinding process condition lower grinding wheel indirectly.When grinding resistance square is greater than the alarm threshold value set under the process conditions, sound-light alarm is issued, operator is reminded to replace or modify in time grinding wheel.
Description
Technical Field
The utility model relates to an optical ultra-precision machining's intelligent monitoring and control field, in particular to grinding wheel wear state's on-line monitoring recognition device.
Background
The grinding wheel is a tool for ultra-precision grinding, and the wear state of the grinding wheel has an important influence on the processing quality of elements, especially on the ultra-precision grinding of brittle and hard optical materials. The abrasion form of the diamond grinding wheel for ultraprecise grinding of the brittle and hard optical material is mainly represented by abrasive particle abrasion, and after the grinding wheel is abraded, the microscopic removal mechanism of the material is changed, and meanwhile, the grinding force is also increased, so that the processing precision and the sub-surface defect quality of the optical element are directly influenced. In order to obtain optical elements with stable quality in batches, the abrasion state of the grinding wheel in the grinding process needs to be monitored in real time, and when the abrasion exceeds a preset threshold value, the grinding wheel needs to be replaced or repaired in time to recover the processing performance of the grinding wheel.
CN106826565A discloses a method for monitoring abrasion and grinding burn of a grinding wheel by using grinding force, which acquires a discrete time sequence of a grinding force signal in real time, and obtains important characteristic parameters of a kurtosis, a waveform index, a peak index, a pulse index and the like of the grinding force signal through time domain and frequency domain analysis, identifies different abrasion degrees of the grinding wheel, and controls the grinding burn. For the online monitoring of the abrasion of the grinding wheel in the ultraprecise machining process of the large-caliber optical element, a large-size and high-precision multichannel force measuring instrument needs to be used, the cost is high, and certain limitation exists in the popularization and application in the field of batch manufacturing.
CN105215852A discloses a device and a method for measuring abrasion of a grinding wheel and G ratio, wherein an acoustic emission signal on-line monitoring system is used for detecting the abrasion state of the grinding wheel, and when the abrasion state signal exceeds a preset threshold value of a computer, an alarm signal is sent out. The device utilizes acoustic emission signal, acquires the wearing and tearing state of emery wheel qualitatively, because the existence of environmental disturbance signal in the grinding process for the accuracy of measuring result is not enough, is difficult to popularize in the ultra-precision optics of trace cutting field.
CN104476398A discloses a method for dynamically compensating abrasion of a grinding wheel of a numerically controlled horizontal axis surface grinder, which indirectly calculates the abrasion loss of the grinding wheel by measuring the active power of a main shaft (grinding head) motor for grinding, thereby realizing dynamic compensation of abrasion of the grinding wheel of the numerically controlled horizontal axis surface grinder. The utility model discloses a be directed against is the indirect measurement of the radial geometric dimension wearing and tearing of emery wheel, and grinding machine main shaft active power receives the influence of machining parameter etc. and need the user to input emery wheel coefficient of wear k according to actual conditions before the use.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a emery wheel wearing and tearing on-line monitoring device based on main shaft grinding resistance moment real-time measurement is provided, the super-precision abrasive machining quality of the fragile hard optical element of heavy-calibre and stability thereof can be improved.
The utility model provides a technical scheme that technical problem adopted is: the grinding wheel abrasion on-line monitoring device based on real-time measurement of the grinding resistance moment comprises a current sensor, a voltage sensor, a data acquisition and conversion system, an industrial PC (personal computer), an audible and visual alarm, a main shaft rotating speed sensor, a feeding speed sensor and a network transmission system; wherein,
the current sensor measures the input current of a main shaft servo motor of the grinding machine tool in the running process and transmits the measured analog signal to the data acquisition and conversion system through the network transmission system;
the voltage sensor measures input voltage of a main shaft servo motor of the grinding machine tool in the operation process and transmits measured analog signals to the data acquisition and conversion system through the network transmission system;
the spindle rotating speed sensor measures the rotating speed of the spindle in the optical element processing process and transmits the measured analog signal to the data acquisition and conversion system through the network transmission system;
the feeding speed sensor measures the rotating speed of an X-axis servo motor in the optical element processing process, transmits the measured analog signal to the data acquisition and conversion system through the network transmission system, and converts the analog signal into the actual feeding speed of the workbench through the data acquisition and conversion system;
the data acquisition and conversion system stores the measured data, converts the data into digital signals and transmits the digital signals to the industrial PC;
after the industrial PC machine receives the signals, the resistance moment M in the process of grinding the element by the grinding wheel is calculated and obtained by the formula 1gComparing the grinding resistance torque with the grinding resistance torque under the corresponding process condition preset in an information database in the industrial PC, and outputting an alarm signal to an audible and visual alarm;
and the audible and visual alarm sends alarm information.
Further, the information database preset in the industrial PC includes grinding resistance moments of the main shaft corresponding to different abrasion states of the grinding wheel under process conditions of different grinding depths, different grating pitches, different main shaft rotation speeds and different feeding speeds.
Furthermore, the industrial PC machine reads the data of the numerical control execution module of the machine tool to obtain the grinding depth and the grating step pitch in the actual grinding process.
The utility model has the advantages that: the method comprises the steps of reading operation parameters of a numerical control system to obtain grinding processing technological parameters of an optical element, measuring servo current and servo voltage of a machine tool spindle in the grinding processing process of the optical element to obtain active power of the spindle, and measuring the rotating speed of the spindle to obtain grinding resistance moment of a grinding wheel in the grinding process, so that the abrasion state of the grinding wheel under the current grinding technological condition is indirectly reflected. When the grinding resistance moment is larger than the set alarm threshold value under the process condition, the grinding wheel is worn and cannot be continuously used for grinding elements, and the device gives out an audible and visual alarm to remind an operator to replace or repair the grinding wheel in time. The utility model discloses can reflect the wearing and tearing state and the processing property of emery wheel in real time on line, not receive component geometry's influence, also can monitor the contact state between component and the emery wheel simultaneously, have advantages such as the interference killing feature is strong, the identification rate is high, be convenient for realize, provide the technology for operating personnel's abrasive machining and guide.
Drawings
Fig. 1 is a schematic view of the device of the present invention.
Fig. 2 is a schematic diagram of an input current measured by the current sensor in the embodiment.
Fig. 3 is a schematic diagram of the input voltage measured by the voltage sensor in the embodiment.
Fig. 4 is a schematic diagram of the spindle rotation speed measured by the spindle rotation speed sensor in the embodiment.
Fig. 5 is a schematic view of the feeding speed measured by the feeding speed sensor in the embodiment.
Detailed Description
The utility model discloses the device is in the same place with the ultra-precise grinding lathe integration of heavy-calibre optical element, realizes the on-line monitoring and the warning of superhard abrasive material diamond grinding wheel wearing and tearing state, as shown in fig. 1, heavy-calibre optical element ultra-precise grinding machine 17 includes Z axle servo motor 8, main shaft servo motor 9, Y axle servo motor 11, lathe stand 12, main shaft 13, emery wheel 14, workstation 16 and X axle servo motor 18. The utility model discloses a emery wheel wearing and tearing on-line monitoring and alarm device based on real-time measurement of main shaft grinding resistance moment includes current sensor 4, voltage sensor 4, feed rate sensor 19, main shaft speed sensor 10, data acquisition conversion system 5, industry PC 6, audible-visual annunciator 7 and network transmission system.
The current sensor 3 is used for measuring the input current of a main shaft servo motor 9 of the grinding machine tool in the running process and transmitting the measured analog signal to the data acquisition and conversion system 5 through a network transmission system.
And the voltage sensor 4 is used for measuring the input voltage of a main shaft servo motor 9 of the grinding machine tool in the operation process and transmitting the measured analog signal to the data acquisition and conversion system 5 through a network transmission system.
The spindle rotation speed sensor 10 is used for measuring the rotation speed of the spindle 13 in the processing process of the optical element 15 and transmitting the measured analog signal to the data acquisition and conversion system 5 through a network transmission system.
The feeding speed sensor 19 is used for measuring the rotating speed of the X-axis servo motor 18 in the processing process of the optical element 15, transmitting the measured analog signal to the data acquisition and conversion system 5 through a network transmission system, and converting the analog signal into the actual feeding speed of the workbench 16 through the data acquisition and conversion system 5;
and the data acquisition and conversion system 5 is used for storing the data measured by the sensors, converting the data into digital signals and transmitting the digital signals to the industrial PC 6.
After receiving the current, voltage, rotating speed data and feeding speed signals, the industrial PC 6 calculates and obtains a resisting moment M in the process of grinding the grinding wheel by the grinding element through a formula 1g。
In formula 1:
Mggrinding resistance torque;
Pgpower when grinding the element;
PEis the electric power input into the main shaft;
UU、UV、UWthree-phase voltage of the input main shaft is obtained through measurement;
IU、IV、IWthree-phase current of the input main shaft is obtained through measurement;
is a phase angle;
omega and n are the measured main shaft rotating speed;
Pflosses for operation of the main shaftThe power is small and can be ignored compared with the grinding power.
The above formula 1 has no feeding speed, and the purpose of measuring the feeding speed is to judge the grinding resistance moment M of the grinding wheel under the machining process of the feeding speedgAnd judging whether the abrasion of the grinding wheel is larger than a set threshold value or not.
The industrial PC 6 obtains the grinding depth and the grating step pitch in the actual grinding process by reading the data of the machine tool numerical control execution module 2, and calls an information database (which corresponds to the grinding resistance moment of the main shaft in different abrasion states of the grinding wheel under the process conditions of different grinding depths, different grating steps, different main shaft rotating speeds and different feeding speeds and is preset in the industrial PC 6) to obtain the current grinding resistance moment M of the actual grinding wheelgAnd comparing the abrasion resistance torque with the abrasion resistance torque under the corresponding process condition in the information database, and determining the abrasion state of the current grinding wheel. When the abrasion state of the grinding wheel exceeds a threshold value set in a database, the grinding wheel is considered to be passivated, the industrial PC 6 outputs an alarm signal and transmits the alarm signal to the audible and visual alarm 7 to send out alarm information to remind an operator to replace or repair the grinding wheel.
Example (b):
in this embodiment, a 1800# resin bond diamond grinding wheel is used to grind a fused quartz optical element, and the process setting parameters in the processing process are as follows: the main shaft rotational speed is 1432r/min, and feed speed is 5000mm/min, and every sword grinding depth is 8 mu m, and the grating step is 8mm, and adopts the utility model discloses the device real-time supervision emery wheel state of wear.
The utility model discloses based on current optics ultra-precision grinding machine tool, as shown in figure 1.
The current sensor 3 adopts a Hall type three-phase alternating current transmission sensor, three-phase alternating current which is input into the spindle servo motor 9 and obtained through measurement is output as analog current of DC 4-20 mA, and as shown in figure 2, the current sensor has no influence on an original equipment circuit in the measurement process.
The voltage sensor 4 outputs the measured three-phase ac voltage input to the spindle servo motor 9 as an analog current of DC4 to 20mA, as shown in fig. 3.
The spindle rotation speed sensor 10 adopts a spot code disc type rotation speed sensor, and outputs the measured actual rotation speed of the spindle 13 as an analog current of DC 4-20 mA, as shown in FIG. 4.
The feeding speed sensor 19 adopts a dot code disk type rotating speed sensor, outputs the measured actual rotating speed of the X-axis servo motor 18 as analog current of DC 4-20 mA, and converts the analog current into the actual feeding speed of the worktable 16 through the data acquisition and conversion system 5, as shown in FIG. 5.
The acquired analog signals of the input current, the input voltage, the spindle rotation speed and the processing feed speed are transmitted to a data acquisition and conversion system 5, the analog signals are converted into digital signals and then transmitted to an industrial PC 6, and the industrial PC 6 calculates the real-time grinding resistance moment M according to the input data and the formula 1g. The industrial PC 6 automatically obtains the grinding depth and the grating step pitch of each cutter in the current processing state by reading the data in the numerical control execution module 2, compares the data with a grinding wheel abrasion information database prestored in the industrial PC, and judges whether the real-time grinding resistance moment exceeds a threshold value set under the current process condition, so as to judge whether the grinding wheel is passivated. If the grinding resistance moment exceeds a set threshold value, an audible and visual alarm signal is output to remind an operator to replace or repair the grinding wheel, so that the grinding safety of the optical element 15 is ensured.
Claims (1)
1. Grinding wheel abrasion on-line monitoring device based on grinding moment of resistance real-time measurement, its characterized in that: the device comprises a current sensor (3), a voltage sensor (4), a data acquisition and conversion system (5), an audible and visual alarm (7), a spindle rotating speed sensor (10), a feeding speed sensor (19) and a network transmission system; wherein,
the current sensor (3) measures the input current of a main shaft servo motor (9) of the grinding machine tool in the running process, and transmits the measured analog signal to the data acquisition and conversion system (5) through the network transmission system;
the voltage sensor (4) measures the input voltage of a main shaft servo motor (9) of the grinding machine tool in the operation process, and transmits the measured analog signal to the data acquisition and conversion system (5) through the network transmission system;
the spindle rotating speed sensor (10) measures the rotating speed of the spindle (13) in the processing process of the optical element (15), and transmits the measured analog signal to the data acquisition and conversion system (5) through the network transmission system;
the feeding speed sensor (19) measures the rotating speed of an X-axis servo motor (18) in the processing process of the optical element (15), transmits the measured analog signal to the data acquisition and conversion system (5) through a network transmission system, and converts the analog signal into the actual feeding speed of the workbench (16) through the data acquisition and conversion system (5);
and the data acquisition and conversion system (5) stores the measured data, converts the data into digital signals and transmits the digital signals to the industrial PC (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820723348.7U CN208621219U (en) | 2018-05-15 | 2018-05-15 | Abrasion of grinding wheel on-Line Monitor Device based on grinding resistance square real-time measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820723348.7U CN208621219U (en) | 2018-05-15 | 2018-05-15 | Abrasion of grinding wheel on-Line Monitor Device based on grinding resistance square real-time measurement |
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| CN208621219U true CN208621219U (en) | 2019-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115383514A (en) * | 2022-09-06 | 2022-11-25 | 陕西法士特齿轮有限责任公司 | Grinding burn monitoring method based on vibration signal time domain analysis |
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2018
- 2018-05-15 CN CN201820723348.7U patent/CN208621219U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115383514A (en) * | 2022-09-06 | 2022-11-25 | 陕西法士特齿轮有限责任公司 | Grinding burn monitoring method based on vibration signal time domain analysis |
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