CN103801837A - Method for predicting quality of laser trimming wheel based on detonation wave pressure and temperature - Google Patents

Abstract

The invention relates to a method for predicting the quality of a laser trimming wheel based on plasma detonation wave pressure and temperature measurement. The method includes the following steps that the position of a plane reflection lens (2) is adjusted, and a laser source is made to conduct incidence by a 45-degree incidence angle; a level gauge is utilized to adjust the position of the plane reflection lens (2), the position of a beam expansion lens (3), the position of a concave surface reflection lens (4) and the position of a spherical surface reflection lens (5), and the center lines of the lenses are made to be located on the same horizontal plane, wherein the optical distance from the beam expansion lens (3) to the concave surface reflection lens (4) is the focal length of the concave surface reflection lens (4); the position of the spherical surface reflection lens (5) is adjusted to make parallel light irradiate the spherical surface reflection lens (5) by the 45-degree incidence angle, and parallel light paths emitted by the spherical surface reflection lens (5) pass through plasma detonation wave measured regions.

Description

A kind of method based on detonation wave pressure and temperature prediction laser reconditioning emery wheel quality

Invention field

The present invention relates to a kind of measurement based on detonation wave pressure and temperature, the method for prediction emery wheel quality, relates in particular to a kind of method based on plasma detonation wave pressure and temperature prediction laser reconditioning emery wheel quality.

Background invention

Laser reconditioning is as the novel method for trimming of one, is based on laser irradiation melt, gasify at wheel face (or distillation) and relevant mass transfer phenomenon (being ablation).During with laser reconditioning emery wheel, because the physical property of bonding agent material and super hard abrasive differs larger, make laser power density that super hard abrasive reaches fusing point than making bonding agent reach the high several orders of magnitude of laser power density of fusing point, therefore the laser technical parameters of repairing by control, can selective removal bonding agent or abrasive particle, obtain good topography and geomorphology.There is the advantages such as coherence is good, monochromaticjty is good, energy density is concentrated based on laser, compare compared with the method for trimming traditional with Mechanical Method, electric spark method etc. with traditional processing technology, the advantages such as it has wide accommodation, dressing accuracy is high, heat-affected zone is little, high-efficiency environment friendly.

Plasma detonation wave is that laser beam focuses on medium, and in the time that the laser power density of focus point reaches certain intensity, medium is by the breakdown high-temperature plasma that becomes, after the further absorbing laser energy of plasma, along the direction formation detonation wave of laser incidence angle.When laser reconditioning emery wheel, very rapid by the temperature rise in laser irradiation region, the instantaneous generation blast of sharply melting, gasify, make metal vapors and fused mass from processing district high velocity jet out, the recoil strength that fused mass high velocity jet produces, forms again strong shock wave in processing district, make melted material splash out, this process just produces plasma detonation wave, and transmission, the mechanism research of the plasma detonation wave producing to laser energy plays vital effect.During specific to laser ablation emery wheel, state, pressure distribution and the Temperature Distribution of plasma detonation wave are reflecting the ablation situation of wheel face.Therefore, research plasma detonation wave temperature and pressure contributes to solve laser reconditioning emery wheel quality and detects online.

In document " observation of laser action aluminium target detonation wave flow field and theory analysis ", when observation light laser effect aluminium target, detonation wave flow field evolutionary process, analyzes detonation wave attenuation law.Optical instrument center is on same straight line, and this is unfavorable for eliminating coma and astigmatism error.

Summary of the invention

The object of the invention is intended to find a kind of based on plasma detonation wave pressure and temperature survey, the method of prediction laser reconditioning emery wheel quality, tested plasma detonation wave is placed in the parallel light path being built into by LASER Light Source and optical element by the method, the density gradient in the deviation degree reflection flow field by plasma detonation wave flow field to light distributes, again according to the self-similarity of shock wave motion, adopt point source explosion model and shock wave fundamental relation formula, the time dependent rule of wave surface pressure and temperature while obtaining repairing, after finishing, adopt the super depth of field to take wheel face quality, test of many times obtains the maximum relation corresponding with laser reconditioning wheel face quality of plasma detonation wave temperature and pressure, known according to the experiment of having done, there are following three kinds of rules: 1. work as detonation wave pressure and maximum temperature value and be less than respectively 60Mpa and 1.3 × 10 ⁷when K, the outstanding abrasive particle of wheel face is less, and diamond abrasive grain projecting height does not reach 2/3 of abrasive particle, wheel face does not have suitable chip space, diamond abrasive grain does not produce micro-crack and graphitization layer, and emery wheel does not have good grinding performance, as shown in Figure 1, 2. work as detonation wave pressure and maximum temperature value and be greater than respectively 60Mpa and 1.3 × 10 ⁷k and be less than 85Mpa and 2.8 × 10 ⁷when K, wheel face diamond abrasive grain is given prominence to suitable height, and outstanding abrasive particle quantity is more, and wheel face has suitable chip space, and diamond abrasive grain does not produce micro-crack and graphitization layer, and emery wheel has good grinding performance, as shown in Figure 2, 3. work as detonation wave pressure and maximum temperature value and be greater than respectively 85Mpa and 2.8 × 10 ⁷when K, the outstanding quantity of wheel face diamond abrasive grain is more, and diamond abrasive grain degree of graphitization is violent, has obvious crackle to produce simultaneously, greatly reduces the grinding capacity of emery wheel, as shown in Figure 3.In the time of laser reconditioning emery wheel, calculate the maximum of detonation wave pressure and temperature, just can realize the online detection of laser reconditioning wheel face quality according to above three kinds of rules.

In order to achieve the above object, the technical scheme that the present invention takes has been to provide a kind of measurement laser reconditioning emery wheel plasma detonation wave pressure and temperature, and the method for prediction emery wheel quality, comprises the following steps:

The position of step 1, adjustment plane reflection eyeglass 2, makes LASER Light Source incidence angle incident at 45 °.

Step 2, utilize level meter, adjust plane reflection eyeglass 2, expand the position of eyeglass 3, concave reflection eyeglass 4, spherical reflector 5, make the center line of each eyeglass in same level, expanding eyeglass 3 is the focal length of concave reflection eyeglass 4 to the light path of concave reflection eyeglass 4.

The position of step 3, adjustment spherical reflector 5 makes directional light incidence angle at 45 ° be irradiated to spherical reflector 5, and the parallel light path that spherical reflector 5 is launched is through the tested region of plasma detonation wave.

Step 4, at plasma detonation wave other end mounting spherical speculum 7, adjust spherical reflector 7 make to be irradiated to concave reflection eyeglass 8 after directional light incidence angle incident at 45 °.

Step 5, the edge of a knife 9 is installed in the focal position of concave reflection eyeglass 8, is adjusted the edge of a knife 9 and make the picture of its cutting light source.

The position of step 6, adjustment high speed camera 10 is to obtain high quality graphic.

Step 7, impulse generator 14 is connected with optical fiber laser 13 and LASER Light Source 1, controller 12 is connected with high-speed motion picture camera 10 respectively at impulse generator 14.

Step 8, switch on power, optical fiber laser performance number, repetition rate, finishing time, grinding machine axial feed velocity and grinding wheel speed are set to desirable value.

Step 9, console start high-speed motion picture camera, when camera tilting mirror reaches 4 × 10 ⁵-6 × 10 ⁵r/min stablizes after high rotating speed, starting impulse signal generator.

In step 10, computer, derive the image of being taken by high-speed motion picture camera;

Step 11, according to the image data extracting, calculate the propagation distance R (t) of wave surface according to following formula

$R=\mathrm{\&epsiv;}{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{1/5}{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA0000468245130000032.png"\; state="\{\{state\}\}">t</figure-callout>}}^{2/5}---\left(\mathrm{II}\right)$

In formula: ε is nondimensional self similarity variable, ρ _afor the density of air, E is explosion energy, and t is the time.

Step 12, according to formula (II), the speed D that obtains shock front motion is:

$D=\frac{\mathrm{dR}}{\mathrm{dt}}=\frac{2}{5}\mathrm{\&epsiv;}{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{1/5}{t}^{-3/5}---\left(\mathrm{III}\right),$

According to the fundamental formular of shock wave, calculate wave surface pressure P _sand temperature T _s,

$P_s=\frac{2}{{\mathrm{\&gamma;}}_v+1}{\mathrm{\&rho;}}_a{\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="HDA0000468245130000032.png"\; state="\{\{state\}\}">D</figure-callout>}}^2=\frac{8}{25({\mathrm{\&gamma;}}_v+1)}{\mathrm{\&rho;}}_a{\mathrm{\&epsiv;}}^2{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{2/5}{t}^{-6/5}---\left(\mathrm{IV}\right)$

$T_s=\frac{p_s}{R_v{\mathrm{\&rho;}}_a}=\frac{8({\mathrm{\&gamma;}}_v-1)}{25{({\mathrm{\&gamma;}}_v+1)}^2}{\mathrm{\&epsiv;}}^2{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{2/5}{t}^{-6/5}\frac{1}{R_v}---\left(V\right)$

The adiabatic exponent γ of metal vapors in its medium plain emery wheel _v=1.42; The gas constant R of metal vapors in emery wheel _v=287.1J/Kg*K; ε, E, ρ _abe respectively self similarity variable, explosion energy and initial density in step 4.Wherein, obtain relational expression according to the conservation of energy

(VI), calculates ε=1.18;

Step 13, data substitution formula (IV) and formula (V) can be obtained respectively to shock wave pressure and the time dependent relation of shock temperature.

Step 14, according to the maximum relation corresponding with laser reconditioning wheel face quality of detonation wave pressure in step 13 and maximum temperature value and plasma detonation wave temperature and pressure, the online wheel face quality that detects while determining laser reconditioning emery wheel, adopt the super depth of field to take wheel face quality after laser reconditioning, checking predicts the outcome.

Beneficial effect of the present invention is:

1, by the light path being built into by LASER Light Source and optical element, the plasma detonation wave producing during by laser reconditioning emery wheel changes into visual flow field, based on point source explosion model and shock wave fundamental relation formula, the time dependent rule of wave surface pressure and temperature just can obtain repairing time.Utilization of the present invention calculates the maximum of detonation wave pressure and temperature, just can realize wheel face quality and detect online.

2, the light path arrangement of the present invention's design, can reduce or eliminate the coma and the astigmatism two class aberrations that are caused by image formation by rays.

Accompanying drawing explanation

Fig. 1 detonation wave pressure and temperature are less than respectively 60Mpa and 1.3 × 10 ⁷the three-dimensional super depth map of wheel face when K;

Fig. 2 detonation wave pressure and temperature are greater than respectively 60Mpa and 1.3 × 107K and the three-dimensional super depth map of wheel face while being less than 85Mpa and 2.8 × 107K;

The three-dimensional super depth map of wheel face when Fig. 3 detonation wave pressure and temperature are greater than respectively 85Mpa and 2.8 × 107K;

Fig. 4 laser plasma detonation wave flow field visual experimental apparatus schematic diagram;

Fig. 5 does not descend the photography photo in laser supported detonation wave flow field in the same time;

Fig. 6 shock wave wave surface pressure time curve schematic diagram;

Fig. 7 shock wave wave surface temperature temporal evolution curve synoptic diagram;

Fig. 8 detonation wave pressure and temperature are 79Mpa and 2 × 10 ⁷the three-dimensional super depth map of wheel face when K.

Wherein: 1-LASER Light Source, 2-adjusts plane reflection eyeglass, 3-expands eyeglass, 4-concave reflection eyeglass, 5-spherical reflector, 6-emery wheel, 7-spherical reflector, 8-concave reflection eyeglass, the 9-edge of a knife, 10-high speed phase, 11-computer, 12-controller, 13-optical fiber laser, 14-impulse generator;

The specific embodiment

Below with reference to accompanying drawing 1-8, the specific embodiment of the present invention is elaborated.

The present invention adopts have the method that the laser of identical sensitivity is background light source perpendicular to the refractive index gradient in all directions in optical axial plane, and it utilizes the density gradient field in flow field to characterize flow field structure.While passing disturbance flow field regions, there is deviation in the collimated light beam of light source after collimation, be subject to disturbance flow field to change and cause the picture of light source to be cut to some extent by the edge of a knife along the different density gradient of edge of a knife direction, thereby in plane, produce light and shade and change recording, brightness increases or weakens and is proportional to disturbance flow field and changes along the density gradient of edge of a knife direction, the light changing arrives after egative film and causes that image illumination changes, thereby observes flow field with the variation of document image illumination.

The light beam that experiment produces optical fiber laser focuses on bronze boart boart wheel surface, when the laser energy density focusing on reaches 1 × 10 ⁸w/m ²when above, emery wheel punctures formation high-temperature plasma.The further absorbing laser energy of high-temperature plasma forms laser plasma detonation wave.Detonation wave causes that surrounding air density sharply changes, recording detonation wave flow field by High Speed Photography changes, because plasma detonation wave flow field region is very large compared with focal spot radius, duration is also long more than laser pulse width, therefore, the detonation wave forming fiber laser beam can be acted on to wheel face time can be found out a point, thinks that laser deposition energy in breakdown point abrupt release out, in air, form shock wave around, it is symmetrical that shock wave flow field is one dimension.Therefore, utilisation point blast model description shock wave flow field evolution Feature, according to shock wave fundamental relation formula, calculates the time dependent rule of wave surface pressure and temperature.

As shown in Figure 4, laser plasma detonation wave flow field visual experimental apparatus and the course of work can be summarized as: LASER Light Source 1 produces beam of laser, this laser beam is radiated at plane reflection eyeglass 2 with 45 ° of incident angles, after plane reflection eyeglass 2 mirror-reflections, be projected to and expand eyeglass 3, beam expanding lens 3 is 1064nm beam expanding lens.Expand eyeglass 3 laser-beam divergence is become to nonparallel multiple laser, reflect to form multi beam parallel laser by concave reflection eyeglass 4 again, light path is the focal length 0.8m of concave mirror, directional light vertical irradiation is at spherical reflector 5, collimated light beam changes through refractive index behind plasma detonation wave region, the laser beam that refractive index changes is mapped to spherical reflector 5 and then reflexes to spheric reflection eyeglass 7, at concave reflection eyeglass, the edge of a knife 9 is placed at 8 focus places, make laser beam focus on the edge of a knife 9, wherein concave reflection eyeglass 4, spherical reflector 5 and concave reflection eyeglass 8, spherical reflector 7 is respectively about laser beam symmetry.High speed camera 10 records the picture being cut by the edge of a knife 9.

Wherein, fiber laser beam wavelength 1064nm, single pulse energy 1mJ, repetition rate 20-80kHz, laser focused eyeglass focal length is 80-100mm, the laser reconditioning time is 5 minutes.The time interval between the every photos of high speed camera is 6.5ns.

Before laser reconditioning emery wheel plasma detonation wave pressure and temperature survey, need optical instrument to regulate, to obtain effective information of flow.The present invention includes optical instrument installation and debugging and laser reconditioning emery wheel plasma detonation wave pressure and temperature survey and adopt the super depth of field to take the process of wheel face quality, comprise the following steps:

The position of step 1, adjustment plane reflection eyeglass 2, makes LASER Light Source incidence angle incident at 45 °.

Step 2, utilize level meter, adjust plane reflection eyeglass 2, expand the position of eyeglass 3, concave reflection eyeglass 4, spherical reflector 5, make the center line of each eyeglass in same level, expanding eyeglass 3 is the focal length of concave reflection eyeglass 4 to the light path of concave reflection eyeglass 4.

Step 3, adjust the position of spherical reflector 5 and make directional light incidence angle at 45 ° be irradiated to spherical reflector 5, and the spherical reflector 5 tested region of plasma detonation wave, directional light path of launching.

Step 4, at plasma detonation wave other end mounting spherical speculum 7, adjust spherical reflector 7 make to be irradiated to concave reflection eyeglass 8 after directional light incidence angle incident at 45 °.

Step 5, the edge of a knife 9 is installed in the focal position of concave reflection eyeglass 8, is adjusted the edge of a knife 9 and make the picture of its cutting light source.

The position of step 6, adjustment high speed camera 10 is to obtain high quality graphic.

Step 7, impulse generator 14 is connected with optical fiber laser 13 and LASER Light Source 1, controller 12 is connected with high-speed motion picture camera 10 respectively at impulse generator 14.

Step 8, switch on power, first optical fiber laser performance number is adjusted to 20-40W, repetition rate 50-90kHz, laser energy 0.1mJ-0.5mJ, grinding machine axial feed 0.008-0.1mm/s, grinding wheel speed 120-200r/min.

Step 9, console start high-speed motion picture camera, when camera tilting mirror reaches 4 × 10 ⁵-6 × 10 ⁵r/min stablizes after high rotating speed, starting impulse signal generator.

Pulse signal generator produces two pulse signals simultaneously: a road signal enabling optical fiber laser 13, another road signal enabling LASER Light Source 1.Produce laser and have time delay of hundreds of microsecond owing to starting to from optical fiber laser, in the circuit that starts background light source, timing circuit is set, to guarantee that optical-fiber laser 13 synchronizes with LASER Light Source 1.

In step 10, computer 11, derive the image of being taken by high-speed motion picture camera 10, as shown in Figure 5: in the time of 6.5us, in figure, occur disturbing phenomenon, occur light-emitting zone in the front of emery wheel.When 13us, in photo there is light-emitting zone in oval ball head.In the time of 26us, wave surface is constantly to external expansion, and oval ball head illuminant regional luminance weakens.There is the phantom of inside and outside two density in the flow field showing when 32.5us, when 45.5us, between two phantoms, there is again new phantom, the now similar semiellipse in shock front border, after this, elliptical wave front and new phantom continue to external expansion, but the shape and size basis of kernel area remains unchanged., disturbance region border is similar to half elliptic when 105us the left and right.

Step 11, can calculate the propagation distance R (t) of wave surface according to the image data extracting, concrete calculate and derivation as follows: (1) optical-fiber laser in the time of emery wheel 6 surface action, laser energy abrupt release, formation plasma detonation wave.(2) Propagation Law of Mine Gas that point source explosion forms is followed Taylor's point source explosion self-similar solution.Shock wave motion is self similarity, it only depend on propagation distance R and time t certain determine combination.(3) undisturbed atmospheric density is even, and pressure of ambient gas, compared with shock wave wave surface pressure, can be ignored.According to above hypothesis, the detonation wave flow field that optical-fiber laser and emery wheel effect form develops and follows flow field Evolution after point source explosion.In point source explosion problem, explosion energy E and ρ are only depended in the motion of gas _ainitial density, wherein energy E=0.1mJ-0.5mJ, ρ _afor the density of air, in the time that temperature is 20 °, atmospheric density is 1.205kg/m ³.Therefore, gas motion is self similarity, and it depends on the distance R of explosion center and certain combination of time t, and wherein distance R is that the flow field figure of taking measures by image processing software.According to dimensional analysis, get nondimensional self similarity variable ε and be:

$\mathrm{\&epsiv;}=R*\left(\frac{{\mathrm{\&rho;}}_a}{{\mathrm{Et}}^2}\right)---\left(I\right),$

In formula: shock motion distance R (t), time t, density p _awith shock front energy E composition self similarity variable ε.

Through transforming, the propagation distance R (t) of wave surface is expressed as:

$R=\mathrm{\&epsiv;}{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{1/5}{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA0000468245130000032.png"\; state="\{\{state\}\}">t</figure-callout>}}^{2/5}---\left(\mathrm{II}\right)$

In formula: ρ _afor the density of air.

Step 12, according to formula (II), the speed that obtains shock front motion is:

$D=\frac{\mathrm{dR}}{\mathrm{dt}}=\frac{2}{5}\mathrm{\&epsiv;}{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{1/5}{t}^{-3/5}---\left(\mathrm{III}\right),$

According to the fundamental formular of shock wave, calculate wave surface pressure P _sand temperature T _s,

$P_s=\frac{2}{{\mathrm{\&gamma;}}_v+1}{\mathrm{\&rho;}}_a{\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="HDA0000468245130000032.png"\; state="\{\{state\}\}">D</figure-callout>}}^2=\frac{8}{25({\mathrm{\&gamma;}}_v+1)}{\mathrm{\&rho;}}_a{\mathrm{\&epsiv;}}^2{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{2/5}{t}^{-6/5}---\left(\mathrm{IV}\right)$

$T_s=\frac{p_s}{R_v{\mathrm{\&rho;}}_a}=\frac{8({\mathrm{\&gamma;}}_v-1)}{25{({\mathrm{\&gamma;}}_v+1)}^2}{\mathrm{\&epsiv;}}^2{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{2/5}{t}^{-6/5}\frac{1}{R_v}---\left(V\right)$

The adiabatic exponent γ of metal vapors in its medium plain emery wheel _v=1.42; The normal R of the gas of metal vapors in emery wheel _v=287.1J/Kg*K; ε, E, ρ a are respectively self similarity variable, explosion energy and the initial density in step 4.Obtain relational expression according to the conservation of energy

(VI),

Can calculate ε=1.18.

Step 13, data substitution formula (IV) and formula (V) can be obtained respectively to shock wave pressure and the time dependent relation of shock temperature.

As shown in Figures 6 and 7.As seen from the figure, in the time of 26ns, detonation wave pressure and temperature all reach maximum, and its value is about respectively 79Mpa and 2 × 10 ⁷k.Along with the time increases, pressure drops to 55Mpa in the time of 39ns, and temperature drops to 1.1 × 10 ⁷k, pressure, variations in temperature are slow subsequently, and pressure rests on 0.5Mpa, and temperature rests on 10 ⁶k.

Step 14, according to the maximum relation corresponding with laser reconditioning wheel face quality of detonation wave pressure in step 13 and maximum temperature value and plasma detonation wave temperature and pressure, the online wheel face quality that detects while determining laser reconditioning emery wheel, adopt the super depth of field to take wheel face quality after laser reconditioning, checking predicts the outcome.

In these examples of implementation, the detonation wave pressure and the maximum temperature value that in step 13, calculate are greater than respectively 60Mpa and 1.3 × 10 ⁷k and be less than 85Mpa and 2.8 × 10 ⁷k, this time 2., wheel face quality should be similar with Fig. 2: wheel face diamond abrasive grain is given prominence to certain height, and wheel face has suitable chip space for laser reconditioning emery wheel agreement with experimental rule, diamond abrasive grain does not produce micro-crack and graphitization layer, and emery wheel has good grinding performance.Adopt the super depth of field to take after this laser reconditioning wheel face and verify and predict the outcome, as shown in Figure 8, be consistent with predicting the outcome.

Although at length disclose the present invention with reference to accompanying drawing, it should be understood that these descriptions are only exemplary, be not used for limiting application of the present invention.Protection scope of the present invention is limited by accessory claim, and can be included in various modification, remodeling and the equivalents in the situation that does not depart from protection domain of the present invention and spirit, done for invention.

Claims (1)

1. the measurement based on plasma detonation wave pressure and temperature, the method for prediction laser reconditioning emery wheel quality, comprises the following steps:

The position of step 1, adjustment plane reflection eyeglass (2), makes LASER Light Source incidence angle incident at 45 °;

Step 2, utilize level meter, adjust plane reflection eyeglass (2), expand the position of eyeglass (3), concave reflection eyeglass (4), spherical reflector (5), make the center line of each eyeglass in same level, expanding eyeglass (3) is the focal length of concave reflection eyeglass (4) to the light path of concave reflection eyeglass (4);

The position of step 3, adjustment spherical reflector (5) makes directional light incidence angle at 45 ° be irradiated to spherical reflector (5), and the parallel light path that spherical reflector (5) is launched is through the tested region of plasma detonation wave;

Step 4, at plasma detonation wave other end mounting spherical speculum (7), adjust spherical reflector 7 make to be irradiated to concave reflection eyeglass (8) after directional light incidence angle incident at 45 °;

Step 5, the edge of a knife (9) is installed in the focal position of concave reflection eyeglass (8), is adjusted the edge of a knife (9) and make the picture of its cutting light source;

The position of step 6, adjustment high speed camera (10) is to obtain high quality graphic;

Step 7, impulse generator (14) is connected with optical fiber laser (13), LASER Light Source (1), controller (12) is connected with high-speed motion picture camera (10) with impulse generator (14) respectively;

Step 8, switch on power, optical fiber laser (13) performance number, repetition rate, finishing time, grinding machine axial feed velocity and grinding wheel speed are set to desirable value;

Step 9, console start high-speed motion picture camera (10), when camera tilting mirror reaches 4 × 10 ⁵-6 × 10 ⁵r/min stablizes after high rotating speed, starting impulse signal generator, wherein, a road signal enabling optical fiber laser (13), another road signal enabling LASER Light Source (1);

In step 10, computer (11), derive the image of being taken by high-speed motion picture camera (10);

Step 11, according to the image data extracting, calculate the propagation distance R (t) of wave surface according to following formula

$R=\mathrm{\&epsiv;}{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{1/5}{t}^{2/5}---\left(\mathrm{II}\right)$

In formula: ε is nondimensional self similarity variable, ρ _afor the density of air, E is explosion energy, and t is the time.

Step 12, according to formula (II), the speed D that obtains shock front motion is:

$D=\frac{\mathrm{dR}}{\mathrm{dt}}=\frac{2}{5}\mathrm{\&epsiv;}{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{1/5}{t}^{-3/5}---\left(\mathrm{III}\right),$

According to the fundamental formular of shock wave, calculate wave surface pressure P _sand temperature T _s,

$P_s=\frac{2}{{\mathrm{\&gamma;}}_v+1}{\mathrm{\&rho;}}_a{D}^2=\frac{8}{25({\mathrm{\&gamma;}}_v+1)}{\mathrm{\&rho;}}_a{\mathrm{\&epsiv;}}^2{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{2/5}{t}^{-6/5}---\left(\mathrm{IV}\right)$

$T_s=\frac{p_s}{R_v{\mathrm{\&rho;}}_a}=\frac{8({\mathrm{\&gamma;}}_v-1)}{25{({\mathrm{\&gamma;}}_v+1)}^2}{\mathrm{\&epsiv;}}^2{\left(\frac{E}{{\mathrm{\&rho;}}_a}\right)}^{2/5}{t}^{-6/5}\frac{1}{R_v}---\left(V\right)$

The adiabatic exponent γ of metal vapors in its medium plain emery wheel _v=1.42; The gas constant R of metal vapors in emery wheel _v=287.1J/Kg*K; ε, E, ρ _abe respectively self similarity variable, explosion energy and initial density in step 4; Wherein, obtain relational expression according to the conservation of energy

(VI), calculates ε=1.18;

Step 13, data substitution formula (IV) and formula (V) can be obtained respectively to shock wave pressure and the time dependent relation of shock temperature.

Step 14, according to the maximum relation corresponding with laser reconditioning wheel face quality of detonation wave pressure in step 13 and maximum temperature value and plasma detonation wave temperature and pressure, the online wheel face quality that detects while determining laser reconditioning emery wheel, adopt the super depth of field to take wheel face quality after laser reconditioning, checking predicts the outcome.

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