CN107966388A - A kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection method and its device - Google Patents
A kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection method and its device Download PDFInfo
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- CN107966388A CN107966388A CN201711207465.4A CN201711207465A CN107966388A CN 107966388 A CN107966388 A CN 107966388A CN 201711207465 A CN201711207465 A CN 201711207465A CN 107966388 A CN107966388 A CN 107966388A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0255—Investigating particle size or size distribution with mechanical, e.g. inertial, classification, and investigation of sorted collections
Abstract
The present invention relates to grinding tool detection field, and in particular to a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection method and its device.Pulling needle contacts the acoustic emission signal during emery wheel when the present invention is rotated by recording emery wheel, distributing homogeneity, contour and the particle diameter uniformity of emery wheel abrasive particle are calculated according to Analysis of Acoustic Emission Signal, so as to provide technical support for the manufacture, inspection and grinding process of coarseness monolayer abrasive wheel.
Description
Technical field
The present invention relates to grinding tool detection field, and in particular to a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection method
And its device.
Background technology
Grinding is removal process of the abrasive particle to workpiece material.Since super hard abrasive wearability is high, abrasive particle is evenly distributed
Property directly affects machining accuracy and surface quality.Ideally abrasive particle is uniformly distributed in carcass, however, surpassing in actual individual layer
In hard material product, often abrasive particle random distribution in carcass, or even produce local accumulation.It is single in the region of abrasive particle accumulation
Abrasive particle stress is small, and wear extent is small, while hinders to process chip removal, causes processing efficiency to decline, or even produce localized burn.Grinding
The rare region of grain, single abrasive particle bear load greatly, and abrasive particle is easily broken or comes off, it is impossible to effectively removes workpiece material.Abrasive particle
Skewness often causes one of the main reason for processing efficiency is low, life tools shorten, in addition, and in grinding process
Produce one of inducement of vibration.
Though mass percent concentration can reflect the abrasive particle distribution situation of wheel face at present, coating, soldering processes are difficult to
Precision is difficult to guarantee when holding, the difficult measurement of gross mass of abrasive particle, and measuring large grinding substrate quality；Commented using area percentage
During valency, survey calculation directly is not easy with microscopic, abrasive particle area, although after being improved, can effectively calculate abrasive particle face
Product and coat of metal area, but quantitatively evaluating cannot be carried out to the distributing homogeneity of abrasive particle, it is difficult to disclose technological parameter to abrasive particle
The affecting laws of distributing homogeneity.Especially in electroplating process, can usually occur abrasive particle accumulation, part abrasive particle pine in a certain region
Dissipate, evaluated using abrasive particle number variance, be affected by human factors big, not comprehensive, the as a result also easy distortion of evaluation.
The content of the invention
The object of the present invention is to provide a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection method and its device, to
Solve the problems, such as in the prior art cannot accurately to detect wheel face abrasive particle distribution.
To achieve the above object, a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection side is aspects of which provided
Method, including method scheme one, method scheme one comprise the following steps：
1) when no object contacts emery wheel and emery wheel is rotated with setting speed, acoustic emission signal is detected, is believed with sound emission
Number amplitude as system background noise signal amplitude；
2) when emery wheel is rotated according to setting speed, the emery wheel outer circumferential surface is scanned, is calculated according to scan data
The contour line of emery wheel outer circumferential surface；
3) when emery wheel is rotated with setting speed, the contour line of the emery wheel outer circumferential surface is followed, control pulling needle is stretched
Movement, its stroke are adapted to pulling needle and the profile of the contact point of emery wheel outer circumferential surface, so that pulling needle keeps connecing with emery wheel outer circumferential surface
Touch；At the same time measure pulling needle contacted with emery wheel caused by acoustic emission signal；
4) with reference to the system background noise signal amplitude, the acoustic emission signal obtained to step 3) is handled,
Detect the distribution character of emery wheel abrasive particle.
Method scheme two, on the basis of method scheme one, further includes before the step 3)：When emery wheel is according to setting
During rotational speed, pulling needle is moved to emery wheel, is dialled when detecting that acoustic emission signal exceeds the system background noise signal amplitude
Pin stops continuing to move to, and judges that pulling needle is contacted with wheel face at this time.
Method scheme three, four, respectively on the basis of method scheme one, two, emery wheel often rotates a circle, and pulling needle is along grinding wheel spindle
Line moves setpoint distance；During emery wheel rotates a circle, pulling needle is fixed along emery wheel axis direction.
Method scheme five, six, respectively on the basis of method scheme three, four, the pulling needle and emery wheel outer circumferential surface elastic connecting
Touch.
Method scheme seven, eight, respectively on the basis of method scheme five, six, sets a mark on emery wheel outer circumferential surface
Thing, to repeat to detect that the marker determines that emery wheel have rotated complete cycle.
Method scheme nine, ten, 11,12, respectively on the basis of method scheme five, six, seven, eight, emery wheel abrasive particle
Distribution character includes uniformity；
The uniformity calculating process includes：Digital filtering processing was carried out to the acoustic emission signal of one week；Described one week
Amplitude of wave form is determined as emery wheel abrasive particle more than the waveform segment of the system background noise signal amplitude in acoustic emission signal, calculates institute
There is emery wheel abrasive particle to correspond to the time difference T in the centre position of waveform segment and be converted to wheel face abrasive particle spacing B, calculate all abrasive particles
The standard deviation δ of spacingb：
Wherein, B units mm；T unit is the second；dsFor grinding wheel diameter, unit mm；nsFor emery wheel actual speed, unit r/min；
B1,B2,…,BiFor all abrasive particle distance values of wheel face,For abrasive particle spacing average value.
Method scheme 13,14,15,16, respectively on the basis of method scheme nine, ten, 11,12, sand
The distribution character of wheel abrasive particle includes contour；
The contour calculating process includes：Digital filtering processing was carried out to the acoustic emission signal of one week；To described one week
Acoustic emission signal waveform in the peak swing value Q of each abrasive particle waveform segment counted, calculate all abrasive particle waveform segments
The standard deviation δ of peak swing value Qq：
Wherein, Q1,Q2,…,QiFor the peak swing value of all abrasive particle waveform segments,For peak swing average value.
Method scheme 17,18,19,20, respectively on the basis of method scheme 13,14,15,16
On, the distribution character of emery wheel abrasive particle includes particle diameter uniformity；
The particle diameter uniformity calculating process includes：Digital filtering processing was carried out to the acoustic emission signal of one week；By described in
The duration T of each abrasive particle waveform segment in the acoustic emission signal waveform of one week ' be converted to Abrasive Particle Size D, calculates all mills
The standard deviation δ of grain particle diameterd：
Wherein, D units are mm；T ' units are the second；dsFor grinding wheel diameter, unit mm；nsFor emery wheel actual speed, unit r/
min；D1,D2,…,DiFor the particle size values of all abrasive particles,For mean particle size.
Correspondingly, present invention also offers a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection device, including device
Scheme one, device scheme one include controller, pointer setting device, the acoustic detector for detecting acoustic emission signal and test
Platform；The controller control connects the acoustic detector；The pointer setting device includes being used to keep connecing with emery wheel to be measured
Tactile pulling needle；The test platform includes being used for the installation station for installing emery wheel to be measured and the drive for driving emery wheel rotation to be measured
Motivation structure.
Device scheme two, on the basis of device scheme one, further includes for the scanning means to emery wheel periphery Surface scan,
The scanning means includes the first driving means for driving the scanning means to be moved axially along emery wheel to be measured, and the controller is adopted
Sample connects the scanning means；The pointer setting device includes the driving unit for driving the pulling needle stretching motion, the controller
Control connects the pointer setting device.
Device scheme three, on the basis of device scheme two, the pointer setting device further includes the driving pointer setting device edge
Second driving device of emery wheel axial movement to be measured.
Device scheme four, on the basis of device scheme three, the scanning means includes laser displacement sensor, and described
One driving device is magnetic frame.
The beneficial effects of the invention are as follows：Pulling needle contacts the sound emission during emery wheel when the present invention is rotated by recording emery wheel
Signal, distributing homogeneity, contour and the particle diameter uniformity of emery wheel abrasive particle is calculated according to Analysis of Acoustic Emission Signal, so as to be coarse grain
The manufacture, inspection and grinding process for spending monolayer abrasive wheel provide technical support.
Meanwhile scanning means scanning wheel face of the present invention, the contour line of emery wheel outer circumferential surface is calculated, makes to dial
Move up and down when pin contacts emery wheel according to the amplitude of the contour line, make the acoustic emission signal that detects more accurate, calculate sand
The distribution character result for taking turns abrasive particle is more accurate.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram of the embodiment of the present invention；
Fig. 2 is the flow chart of present invention method.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
The present invention is in order to which when measuring the abrasive particle of coarseness monolayer abrasive wheel, the distributed in three dimensions that can be accurately obtained abrasive particle is special
Property, such as uniformity, contour, particle diameter uniformity etc., there is provided a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection side
Method and its device.
The method of the invention is pulling needle and stone layer surface to be measured when emery wheel to be measured is rotated according to setting speed
Elastic Contact is kept, detects the acoustic emission signal of generation in the process, sand is calculated according to the Analysis of Acoustic Emission Signal detected
Take turns the distribution character of abrasive particle.Meanwhile to overcome influence of the emery wheel bounce to testing result, add the detection of wheel face macro contours
And the method for pulling needle trailing type movement.The embodiment for realizing the method for the invention is not unique, is given below one specifically
Embodiment be used for illustrate present disclosure.
Fig. 1 is the structure diagram of the embodiment of device of the present invention, and emery wheel 11 is installed on by emery wheel installation axle 12
On grinding wheel drive mitor 13, grinding wheel drive mitor 13 connects data collecting card 41 by data cable, and is fixedly mounted on by trip bolt
On emery wheel horizontal sliding table 14, emery wheel horizontal sliding table 14 can be fixedly mounted along 11 axial translation of emery wheel, its bottom by trip bolt
On integrated support frame；Integral type is set to measure pulling needle part 31,31 top of integral type measurement pulling needle part below 11 periphery of emery wheel
Pulling needle and 11 outer round surface Elastic Contact of emery wheel, the center of 11 axis of pulling needle face emery wheel, 31 tail end bottom of integral type measurement pulling needle part
Acoustic emission sensor 32 is installed by magnetic support on seat, between 31 tail end base of integral type measurement pulling needle part and acoustic emission sensor 32
Couplant is set, and acoustic emission sensor 32 is connected to data collecting card 41,31 tail of integral type measurement pulling needle part by data cable
End base is fixedly mounted on three-dimensional Mobile Slide 33 by trip bolt, and three-dimensional Mobile Slide can be axially moved along emery wheel,
The lifting sliding table installation slide unit servomotor 34 of three-dimensional Mobile Slide 33 is so that three-dimensional Mobile Slide moves up and down, and is watched by slide unit
Take motor 34 to drive, slide unit servomotor 34 is connected to data collecting card 41, the bottom of three-dimensional Mobile Slide 33 by data cable
Portion is fixedly mounted on integrated support frame by trip bolt；Meanwhile below 11 periphery of emery wheel, pulling needle part is measured with integral type
31 are arranged side by side laser displacement sensor 21 along emery wheel 11 is axial, laser displacement sensor 21 with 11 outer round surface of emery wheel is non-connects
Touching, laser facula is connected to data collecting card 41 by the center of 11 axis of emery wheel, laser displacement sensor 21 by data cable,
And laser displacement sensor 21 is fixedly mounted on supporting rack by adjustable magnetic frame 22；Final data capture card 41 passes through
Data cable is connected to computer 42.
Fig. 2 is the flow chart of present invention method, and step is as follows：
Step 1：In the present embodiment, 60/70 electroplated diamond ordered arrangement emery wheel of granularity is selected, emery wheel 11 is installed on sand
On turbin generator 13；Non-transparent narrow adhesive tape is pasted at 11 periphery one of emery wheel；Adjust the front and rear to level of three-dimensional Mobile Slide 33
Slide unit and left and right make integral type measure the center of 31 top pulling needle face emery wheel of pulling needle part, 11 axis, one when initial to horizontal sliding table
The top pulling needle and 11 outer round surface of emery wheel of body formula measurement pulling needle part 31 are non-contact；Magnetic frame 22 is adjusted, senses laser displacement
Device 21 is axial placed side by side along emery wheel 11 with integral type measurement pulling needle part 31, and laser facula passes through the center of 11 axis of emery wheel；
Computer 42 controls data collecting card 41 to convey signal to grinding wheel drive mitor 13, emery wheel 11 is at the uniform velocity rotated with reasonable low speed.
Step 2：21 sample frequency f=50kHz of laser displacement sensor is set, starts laser displacement sensor 21 to emery wheel
11 outer round surface configuration samplings, sampled data are delivered to computer 42 by data collecting card 41, and processing swashs computer 42 in real time
21 sampled data of Optical displacement sensor, calculates 11 actual speed of emery wheel and its outer circumferential surface contour line, and data processing includes step
2.1-2.2。
Step 2.1：Data processing calculates 11 actual speed of emery wheel, and method is：
1. judge adhesive tape positional information.Emery wheel 11 rotates, when laser displacement sensor 21 is scanned to adhesive tape, since adhesive tape is thick
The presence of degree, sampled data range value can increase.Based on the principle, the sampled data of laser displacement sensor 21 is utilized
Method of moving average processing, as shown in formula (1), when the amplitude of lasting multiple data points significantly increases in the data after processing, then swashs
Optical displacement sensor 21 is can determine that in the current location that emery wheel 11 up-samples as the adhesive tape position on emery wheel 11.
In formula,For the moving average after calculating；StFor current data point value；T is current data point sequence number；N is
Rolling average point number.
2. calculate 11 actual speed of emery wheel.Started with scanning to adhesive tape position, terminate to scanning again to adhesive tape position, cut
The 11 periphery laser displacement sensor of one week of emery wheel, 21 sampled data is taken, calculates data point number, emery wheel 11 is calculated by formula (2)
Actual speed.
ns=60f/L (2)
In formula, nsFor 11 actual speed of emery wheel, ns=10r/min；L is the emery wheel 11 periphery laser crude sampling of one week
Data point number；F is 21 sample frequency of laser displacement sensor, f=50000Hz.
Step 2.2：Data processing calculates 11 outer circumferential surface contour line of emery wheel, and method is：
1. for the laser sampling data of 11 outer round surface abrasive material of emery wheel, noise data are rejected by data processing.Pick
Except principle is：The data of the certain sampling length in 11 surface of emery wheel, its amplitude of variation is not over certain threshold value.In the present embodiment,
Data length 200 is taken, threshold value is arranged to 0.25mm.After rejecting noise data, using linear interpolation method supplementary data point.
2. calculate 11 outer circumferential surface contour line of emery wheel.Method is, for the 11 periphery laser displacement sensor of one week of emery wheel
21 sampled datas, the data segment for taking sampling length to be 1000, takes its maximum as characteristic strong point, and fixed data segment length
It is point-by-point mobile afterwards, all characteristic strong points in emery wheel 11 periphery, one week sampled data are obtained, for these characteristic strong points
Polynomial curve fitting is carried out, fitting exponent number value 10, obtains 11 outer circumferential surface contour line of emery wheel.
Step 3：31 rotating 11 outer round surface of emery wheel of top pulling needle Elastic Contact of integral type measurement pulling needle part, and according to sand
Take turns 11 outer circumferential surface contour line amplitudes and carry out trailing type movement up and down, launch acoustic emission signal, and detected by acoustic emission sensor 32.
Specifically include step 3.1-3.5.
Step 3.1：Emery wheel horizontal sliding table 14 is adjusted, moves axially emery wheel 11, until integral type measurement pulling needle part 31
Position of 21 hot spot of laser displacement sensor on emery wheel 11 in the pulling needle face step 2 of top.Integral type measurement pulling needle part 31
Top pulling needle and 11 outer round surface of emery wheel are non-contact, when acoustic emission sensor 32 detects pulling needle and non-contact 11 outer round surface of emery wheel
Acoustic emission signal, using acoustic emission signal waveform amplitude at this time as system background noise signal amplitude.
Step 3.2：Computer 42 controls data collecting card 41 to output signal to slide unit servomotor 34, makes three-dimensional mobile cunning
Platform 33 drives integral type measurement pulling needle part 31 slowly to move up, and is carried on the back until acoustic emission sensor 32 starts to detect higher than system
Stop during the acoustic emission signal of scape noise amplitude signal.
Step 3.3：Amplitude maximum point is found on 11 outer circumferential surface contour line of emery wheel as 11 excircle configuration highest order of emery wheel
Put, and the adhesive tape position that laser displacement sensor 21 judges is corresponded on 11 outer circumferential surface contour line of emery wheel, calculate outside emery wheel 11
The number P of corresponding laser sampling data point between peripheral surface profile line adhesive tape position and 11 excircle configuration extreme higher position of emery wheel,
When laser displacement sensor 21 obtains adhesive tape position signal, the rotational time T again of emery wheel 11s, then 11 excircle configuration highest of emery wheel
Position is rotated to the top pulling needle of laser displacement sensor 21 and integral type measurement pulling needle part 31, calculates TsAs shown in formula (3).
Ts=60/ns·P/L (3)
In formula, time TsUnit is the second；nsFor 11 actual speed of emery wheel, unit r/min；L is 11 periphery of emery wheel one week
Laser original sampling data point number.
Step 3.4：11 excircle configuration extreme higher position of emery wheel is rotated to laser displacement sensor 21 and integral type measurement pulling needle
When at the top pulling needle of part 31, computer 42 controls 34 setting in motion of slide unit servomotor by data collecting card 41, and data are adopted
Pulse of the truck 41 to 34 output frequency F real-time changes of slide unit servomotor, slide unit servomotor 34 drive three-dimensional Mobile Slide
33 make integral type measurement pulling needle part 31 carry out trailing type movement up and down according to 11 outer circumferential surface contour line relief intensity of emery wheel.
Data collecting card 41 often exports a pulse to slide unit servomotor 34, then emery wheel 11 rotates θ angles：
In formula, θ units are radian；nsFor 11 actual speed of emery wheel, unit r/min；F is what slide unit servomotor 34 received
Pulse frequency, unit Hz.
The coordinate of 11 outer circumferential surface contour line of emery wheel is corresponding with 11 rotation angle of emery wheel, when calculating the rotation θ angles of emery wheel 11
Relief intensity value H on 11 outer circumferential surface contour line of emery wheel, establishes H and θ relational expressions：
H=λ θ (5)
In formula, coefficient lambda is calculated by 11 outer circumferential surface contour line formula of emery wheel, range value H units mm.
Then slide unit servomotor 34, which receives pulse frequency F, should meet relation shown in formula (6).
In formula, R rotates a circle the distance that corresponding three-dimensional Mobile Slide 33 moves up and down for slide unit servomotor 34, unit
mm；K rotates a circle for slide unit servomotor 34 and receives pulse number.
Step 3.5：Integral type measurement pulling needle part 31 according to 11 outer circumferential surface contour line relief intensity of emery wheel follow up and down
Formula moves, its top pulling needle and 11 outer round surface of emery wheel Elastic Contact all the time, and the friction of pulling needle and 11 Abrasive Grain of emery wheel, hit
Hit, the deformation of pulling needle, vibration can launch acoustic emission signal, and the voice sending sensor installed on integral type measurement pulling needle part 31
Device 32 receives.When computer 42 obtains adhesive tape position signal, start recording preserves the sound emission letter that acoustic emission sensor 32 obtains
Number, when computer 42 obtains adhesive tape position signal again, stop recording simultaneously preserves acoustic emission signal, meanwhile, computer 42 is controlled
Slide unit servomotor 34 processed moves, and moves down integral type measurement pulling needle part 31 and disengages 11 outer round surface of emery wheel.
Step 4：Computer 42 will record the acoustic emission signal progress data processing preserved, obtain 11 outer round surface of emery wheel mill
Uniformity, contour, the result such as particle diameter uniformity of grain distribution.Specifically include step 4.1-4.4.
Step 4.1：Digital filtering processing.Frequency content analysis is carried out to the acoustic emission signal of acquisition and recording, designs 8 ranks bar
Special Butterworth bandpass filter, and determine upper and lower limit cutoff frequency, to filter out in the acoustic emission signal and system of pulling needle low-frequency vibration
Portion's High-frequency Interference noise.
Step 4.2：Analyze abrasive particle distributing homogeneity.Pulling needle and abrasive particle not in contact with when acoustic emission signal waveform amplitude it is smaller,
Its amplitude is arranged to background noise threshold, signal waveform amplitude is remarkably reinforced when pulling needle is contacted with abrasive particle.For sound emission
Signal waveform, amplitude of wave form are determined as abrasive particle beyond the waveform segment of background noise threshold, calculate the centre of all abrasive particle waveform segments
The time difference T of position, is converted to 11 Abrasive Grain spacing B of emery wheel by formula (7), calculates the standard deviation δ of all abrasive particle spacingb,
Index as evaluation 11 Abrasive Grain distributing homogeneity of emery wheel.δbMore big then abrasive particle distributing homogeneity is poorer.
In formula, B units are mm；T unit is the second；dsFor 11 diameter of emery wheel, unit mm；nsFor 11 actual speed of emery wheel, unit
r/min。
In formula, B1,B2,…,BiFor all abrasive particle distance values in 11 surface of emery wheel,For abrasive particle spacing average value.
Step 4.3：Analyze abrasive particle distribution contour.When pulling needle is contacted with high abrasive particle, friction and the mutually relatively low mill of effect of impact
Grain becomes apparent from, and the acoustic emission signal of transmitting is stronger.For the peak swing of each abrasive particle waveform segment in acoustic emission signal waveform
Value Q is counted, and calculates the standard deviation δ of all abrasive particle waveform segment peak swing valuesq, as evaluation 11 Abrasive Grain of emery wheel distribution
The index of contour, δqMore big then abrasive particle contour is poorer.
In formula, Q1,Q2,…,QiFor the peak swing value of all abrasive particle waveform segments,For peak swing average value.
Step 4.4：Analyze the particle diameter uniformity of abrasive particle.When Abrasive Particle Size is larger, pulling needle and abrasive particle time of contact are longer, mill
Grain particle diameter is small, then pulling needle and abrasive particle time of contact are short.By the duration of each abrasive particle waveform segment in acoustic emission signal waveform
T ' is converted to Abrasive Particle Size D by formula (10), calculates the standard deviation δ of all Abrasive Particle Sizesd, as evaluation 11 Abrasive Grain of emery wheel
The index of particle diameter uniformity.δdMore big then Abrasive Particle Size uniformity is poorer.
In formula, D units are mm；T ' units are the second；dsFor 11 diameter of emery wheel, unit mm；nsIt is single for 11 actual speed of emery wheel
Position r/min.
In formula, D1,D2,…,DiFor the particle size values of all abrasive particles,For mean particle size.
In above-described embodiment, first with laser displacement sensor to emery wheel work to be measured before pulling needle and emery wheel to be measured contact
The setting regions for making layer side face is scanned, and the mode scanned is emery wheel at the uniform velocity rotates, laser displacement sensor is fixed, whole
Circular scanning samples.Pulling needle is set to be contacted with the setting regions scanned after the completion of scanning, detection pulling needle is set with stone layer surface
Determine the acoustic emission signal that region contact produces, analyzing and processing acoustic emission signal draws wheel face abrasive particle distribution character.Work as needs
, it is necessary to which emery wheel is divided into different regions according to the present embodiment when measuring the abrasive particle distribution character of stone face all areas
Method is detected one by one, and the abrasive particle distribution of as grinding wheel cylindrical week working face all areas is special after obtained testing result collects
Property.
In other implementations, to obtain the abrasive particle distribution character of emery wheel whole circumference working face all areas,
Whole scanning results of stone side face to be measured can be obtained by Multiple-Scan first with laser displacement sensor, or made
Whole scanning results of stone side face to be measured are obtained with Linear Laser displacement sensor run-down, and therefrom processing is shaked out
Working face macro contours information is taken turns, then pulling needle and emery wheel to be measured contact and then measure acoustic emission signal.If first treated
Survey whole scanning results of stone side face, and after therefrom handling out emery wheel working face macro contours information, then can have with
Under type：Pulling needle is contacted with stone layer surface, and emery wheel to be measured at the uniform velocity rotates for several weeks, and while measuring acoustic emission signal, is dialled
Pin can axially be moved along emery wheel to be measured according to setting speed；Or pulling needle is fixed, emery wheel rotation to be measured has been measured
After the acoustic emission signal to circle, pulling needle moves axially setpoint distance along emery wheel to be measured, measures next all acoustic emission signals.
Meanwhile in embodiment after pulling needle is contacted with emery wheel to be measured, the sound hair during measuring emery wheel to be measured and rotating a circle
When penetrating signal, pulling needle carries out trailing type up and down according to stone face macro contours and moves, and is made with beating when solving emery wheel rotation
Into the problem of testing result distortion, ensure the abrasive particle on pulling needle and emery wheel to be measured can accurately, come into full contact with, can not only judge
Whether there is abrasive particle, moreover it is possible to accurately detect height of grain, grit size and distribution spacing etc., realize abrasive particle distributing homogeneity, etc.
The detection evaluation of Gao Xing, particle diameter uniformity.
But the invention is not limited in this mode that embodiment provides, as long as emery wheel bounce can be overcome to testing result
Influence, ensure that pulling needle and the different abrasive particle of wheel face height can be contacted rationally, thus can be according to measurement
Acoustic emission signal calculates the distribution character of abrasive particle.
Pulling needle is directed toward the axle center of emery wheel to be measured when pulling needle and emery wheel to be measured contact in the present embodiment, in other embodiments
Pulling needle can not also be directed toward the axle center of emery wheel to be measured, can with others be directed toward and emery wheel to be measured contact, as long as ensure pulling needle and
Abrasive particle on stone face to be measured can be contacted individually.
The present invention is not limited to described embodiment, such as changes scanning means or pointer setting device relative to emery wheel
Position, either change the type of drive of each position or driving device or change the specific ginseng of frequency etc. in operational process
Number numerical value, the technical solution so formed are finely adjusted above-described embodiment to be formed, and this technical solution still falls within this hair
In bright protection domain.
Claims (10)
1. a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection method, it is characterised in that comprise the following steps：
1) when no object contacts emery wheel and emery wheel is rotated with setting speed, acoustic emission signal is detected, with acoustic emission signal
Amplitude is as system background noise signal amplitude；
2) when emery wheel is rotated according to setting speed, the emery wheel outer circumferential surface is scanned, emery wheel is calculated according to scan data
The contour line of outer circumferential surface；
3) when emery wheel is rotated with setting speed, the contour line of the emery wheel outer circumferential surface is followed, control pulling needle carries out stretching motion,
Its stroke is adapted to pulling needle and the profile of the contact point of emery wheel outer circumferential surface, so that pulling needle keeps contacting with emery wheel outer circumferential surface；Together
When measurement pulling needle contacted with emery wheel caused by acoustic emission signal；
4) with reference to the system background noise signal amplitude, the acoustic emission signal obtained to step 3) is handled, detection
The distribution character of emery wheel abrasive particle.
A kind of 2. trailing type monolayer abrasive wheel abrasive particle distribution character detection method according to claim 1, it is characterised in that：Institute
Further included before stating step 3)：When emery wheel is rotated according to setting speed, pulling needle is moved to emery wheel, when detecting acoustic emission signal
Pulling needle stops continuing to move to during beyond the system background noise signal amplitude, judges that pulling needle is contacted with wheel face at this time.
A kind of 3. trailing type monolayer abrasive wheel abrasive particle distribution character detection method according to claim 1 or claim 2, it is characterised in that：
Emery wheel often rotates a circle, and pulling needle moves setpoint distance along emery wheel axis；During emery wheel rotates a circle, pulling needle is along emery wheel axis side
To fixation.
A kind of 4. trailing type monolayer abrasive wheel abrasive particle distribution character detection method according to claim 3, it is characterised in that：It is described
Pulling needle and emery wheel outer circumferential surface Elastic Contact.
A kind of 5. trailing type monolayer abrasive wheel abrasive particle distribution character detection method according to claim 4, it is characterised in that：In sand
Take turns and a marker is set on outer circumferential surface, to repeat to detect that the marker determines that emery wheel have rotated complete cycle.
6. according to a kind of trailing type monolayer abrasive wheel abrasive particle distribution character detection method of claim 4 or 5, it is characterised in that：
The distribution character of emery wheel abrasive particle includes uniformity；
The uniformity calculating process includes：Digital filtering processing was carried out to the acoustic emission signal of one week；The sound hair of described one week
Penetrate amplitude of wave form in signal and be determined as emery wheel abrasive particle more than the waveform segment of the system background noise signal amplitude, calculate all sand
Wheel abrasive particle corresponds to the time difference T in the centre position of waveform segment and is converted to wheel face abrasive particle spacing B, calculates all abrasive particle spacing
Standard deviation δb：
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<mo>(</mo>
<msub>
<mi>B</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<mover>
<mi>B</mi>
<mo>&OverBar;</mo>
</mover>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<mn>...</mn>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>B</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<mover>
<mi>B</mi>
<mo>&OverBar;</mo>
</mover>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
<mi>i</mi>
</mfrac>
</msqrt>
</mrow>
Wherein, B units mm；T unit is the second；dsFor grinding wheel diameter, unit mm；nsFor emery wheel actual speed, unit r/min；B1,
B2,…,BiFor all abrasive particle distance values of wheel face,For abrasive particle spacing average value.
A kind of 7. trailing type monolayer abrasive wheel abrasive particle distribution character detection method according to claim 6, it is characterised in that：Emery wheel
The distribution character of abrasive particle includes contour；
The contour calculating process includes：Digital filtering processing was carried out to the acoustic emission signal of one week；To the sound of described one week
The peak swing value Q of each abrasive particle waveform segment in transmitting signal waveform is counted, and calculates the maximum of all abrasive particle waveform segments
The standard deviation δ of amplitude Qq：
<mrow>
<msub>
<mi>&delta;</mi>
<mi>q</mi>
</msub>
<mo>=</mo>
<msqrt>
<mfrac>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>Q</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<mover>
<mi>Q</mi>
<mo>&OverBar;</mo>
</mover>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>Q</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<mover>
<mi>Q</mi>
<mo>&OverBar;</mo>
</mover>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<mn>...</mn>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>Q</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<mover>
<mi>Q</mi>
<mo>&OverBar;</mo>
</mover>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
<mi>i</mi>
</mfrac>
</msqrt>
</mrow>
Wherein, Q1,Q2,…,QiFor the peak swing value of all abrasive particle waveform segments,For peak swing average value.
A kind of 8. trailing type monolayer abrasive wheel abrasive particle distribution character detection method according to claim 7, it is characterised in that：Emery wheel
The distribution character of abrasive particle includes particle diameter uniformity；
The particle diameter uniformity calculating process includes：Digital filtering processing was carried out to the acoustic emission signal of one week；By described one week
Acoustic emission signal waveform in each abrasive particle waveform segment duration T ' be converted to Abrasive Particle Size D, calculate all abrasive particle grains
The standard deviation δ in footpathd：
<mrow>
<mi>D</mi>
<mo>=</mo>
<mi>&pi;</mi>
<mo>&CenterDot;</mo>
<msub>
<mi>d</mi>
<mi>s</mi>
</msub>
<mo>&CenterDot;</mo>
<mfrac>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mn>60</mn>
</mfrac>
<mo>&CenterDot;</mo>
<msup>
<mi>T</mi>
<mo>&prime;</mo>
</msup>
</mrow>
<mrow>
<msub>
<mi>&delta;</mi>
<mi>d</mi>
</msub>
<mo>=</mo>
<msqrt>
<mfrac>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<mrow>
<msub>
<mi>D</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<mover>
<mi>D</mi>
<mo>&OverBar;</mo>
</mover>
</mrow>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<mrow>
<msub>
<mi>D</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<mover>
<mi>D</mi>
<mo>&OverBar;</mo>
</mover>
</mrow>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<mn>...</mn>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<mrow>
<msub>
<mi>D</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<mover>
<mi>D</mi>
<mo>&OverBar;</mo>
</mover>
</mrow>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
<mi>i</mi>
</mfrac>
</msqrt>
</mrow>
Wherein, D units are mm；T ' units are the second；dsFor grinding wheel diameter, unit mm；nsFor emery wheel actual speed, unit r/min；
D1,D2,…,DiFor the particle size values of all abrasive particles,For mean particle size.
A kind of 9. trailing type monolayer abrasive wheel abrasive particle distribution character detection device, it is characterised in that：Including controller, pointer setting device,
For detecting the acoustic detector and test platform of acoustic emission signal；The controller control connects the sonic detection dress
Put；The pointer setting device includes being used for the pulling needle contacted with emery wheel to be measured holding；The test platform includes being used to install to be measured
The installation station of emery wheel and the driving mechanism for driving emery wheel to be measured to rotate.
A kind of 10. trailing type monolayer abrasive wheel abrasive particle distribution character detection device according to claim 9, it is characterised in that：Also
Including for the scanning means to emery wheel periphery Surface scan, the scanning means includes driving the scanning means along emery wheel to be measured
The first driving means of axial movement, the controller sampling connect the scanning means；The pointer setting device includes driving institute
The driving unit of pulling needle stretching motion is stated, the controller control connects the pointer setting device.
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| CN112894621A (en) * | 2021-03-21 | 2021-06-04 | 重庆市腾龙磨料磨具有限公司 | Abrasion loss measuring equipment for grinding wheel |
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