CN1116297A - Testing method and equipment for disc saw - Google Patents

Abstract

The saw disc state can be reflected by tested natural frequency, transverse deformation and end face run-out, said method uses ingle-board computer. The equipment of said invention consists of mechanical gearing, holding device, force-adding device, sensor, wave filter, A/D convertor, single-board computer system, LED display and printer.

Description

The detection method of disc saw and equipment

The present invention relates to saw blade fitted and advance to detect its suitable method and apparatus of opening state when open handling.

Handling for suitable is to strengthen the saw blade dynamic stability, improves the sawing precision, reduces saw kerf and loses the most frequently used a kind of disposal route.In recent years, the suitable technology of opening of saw blade has obtained great success, multiple tensity disposal method occurred.Yet, which kind of tensity disposal method no matter, its essence all is to rely on to introduce the dynamic stability that reasonably suitable tension stress improves saw blade in the saw blade.The control of best suitable Zhang Xiaoguo requires the accurate detection means of science.But.Make a general survey of after the suitable present situation of opening the detection technique field as can be seen;

(1) also there is not a kind of quantitative criteria that can comprehensively reflect the suitable state of saw blade.

(2) in the prior art, " the light slit detection method " that adopts still rests on handwork usually, and eye-observation on the level that experience is differentiated, is difficult to adapt to the requirement of modern industry development.

(3) under scientific research or laboratory condition, though can use the internal stress of modern means pointwise test saw blades such as X ray stress ga(u)ge, directly still very difficult with a suitable state of these test results statement saw blades.Even the stress distribution of reflection saw blade also need be tested mass data, and will be carried out analyzing and processing to these data.Apparatus expensive in addition, complicated operation, reasons such as technical requirement height are not suitable for using in industry.

(4) in recent years, though also the someone studied the suitable detection method of opening of new saw blade, as detecting internal stress with the AE ripple, detect natural frequency etc. with the sine excitation method, what but these methods had does not solve because of the demarcation problem, what have the suitable state of opening of saw blade also has some problems because of detected parameters can not reflect comprehensively in addition equipment, operation in, therefore all fail to reach industrial suitable requirement.

(5) in U.S. Pat-5,163, a kind of method of testing of saw blade is disclosed in 334, adopt this method, by frequency domain response and the time domain response of test saw blade under selected speed conditions, and the natural frequency of saw blade and saw kerf width, weigh the characteristic of saw blade.But this method still can not quantize to reflect suitable Zhang Chengdu and suitable other two parameters of opening state of saw blade.

In view of above-mentioned all points, task of the present invention provides a kind of parameter that can comprehensively reflect the suitable state of saw blade, and the method and apparatus of quick, accurate these parameters of Non-Destructive Testing displayed record of energy.Undoubtedly this saw blade is suitable to be opened theoretically to improving, promote suitable opening and the development of detection technique, improve system saw and all significant with the saw level.

Various tensity disposal methods all are to rely in the saw blade to introduce suitable tension stress and reach the purpose that not only can improve the stability of saw blade but also can reduce saw blade thickness.Because suitable tension stress can have influence on vibration, noise, rigidity, the planarization of saw blade, even many physical and mechanical properties such as electricity, magnetic, therefore, accurately detect and reflect comprehensively the suitable state of opening of saw blade, to the design of instructing saw blade and saw, make, instruct the saw doctor to plant, improve the saw blade quality, it all is very important prolonging saw blade serviceable life.

The past people use tension, promptly fit Zhang Chengdu, describe the suitable state of opening of saw blade.This is incomplete.Because the suitable state of opening of a saw blade not only comprises suitable Zhang Chengdu, also should comprise suitable tension stress distribution characteristics, and the suitable planarization of opening the back saw blade.No matter be traditional observation " light slit " size, still use modern method for measuring stress, it is all very difficult to explain suitable this notion of state of opening all-sidedly and accurately.

Discover that after rationally suitable the opening, the suitable tension stress characteristic distributions of saw blade is: the outer zone by sawtooth is circumferential tension stress, and leans on the less or hoop pressure stress of the circumferential tension stress in Nei Huan district of suit hole one side.Radial stress is that the edge is little along the characteristic distributions of saw blade radial direction, and is broad in the middle, be all compressive stress, and value is littler than circumferential stress.

Discover that a suitable processing can make the natural frequency of saw blade n 〉=2 high order modes increase, the natural frequency of these two lower modes of n=0 and n=1 is reduced, as shown in Figure 7.Reason is, the former mainly is subjected to the influence of the circumferential tension stress of outer zone, and the latter mainly is subjected to the influence of Nei Huan district hoop pressure stress, when the natural frequency of n=0 mode drop in zero the time, saw blade can serious " dishization ", this is an important symbol of excessively fitting.As long as solve each rank natural frequency problem accurate under industrial condition, the fast detecting saw blade, just can find the quantification parameter of the suitable Zhang Chengdu of accurate reflection saw blade.

Experiment and research show that also the natural frequency of saw blade changes the distribution characteristics that can not reflect suitable tension stress, but the stiffness variation of saw blade periphery but can reflect this feature.Fig. 9 is that saw blade is fitted Zhang Qianhou under central clamp position, when periphery a bit loads, and the each point transversely deforming amount μ of circumferencial direction angle 9 expressions _θCurve, this curve can with under the quantitative description that establishes an equation: ${\mathrm{\μ}}_{\mathrm{\θ}}=\frac{3(1-u^2)\mathrm{FD}}{\mathrm{\π}{\mathrm{Et}}^3}\mathrm{\ΣCnCosn\θ}$ In the formula:

F-load;

D-saw blade diameter;

T-saw blade thickness;

The elastic modulus of E-saw blade material;

The Poisson ratio of μ-saw blade material:

N-nodal diameter number;

Cn-with the corresponding elastic deformation coefficient of n.

The suitable Cn value that can change a saw blade of opening.Therefore, the rigidity that can change saw blade is at " the change curve of above-mentioned horizontal shape amount when block curve is represented that saw blade is suitable and opened among Fig. 9.The change curve of this deflection after dashed curve is represented that saw blade is suitable and opened.As can be seen from Figure 9, greatly about near θ=90 °, the deflection of suitable Zhang Qianhou is the sensitiveest.Saw blade is μ before suitable opening _θVery little, even be negative value (deformation direction and loading direction are opposite); After suitable the opening, μ _θFor on the occasion of, quantity increases with suitable Zhang Chengdu.Therefore, if can solve under the industry spot condition, the measurement quick and precisely and the displayed record problem of the transversely deforming of the arbitrary radius of saw blade in one week, not only can solve the detection problem of saw blade end face circumferencial direction planarization (being commonly called as Circular Run-out Tolerance), and can be by detecting saw blade μ in the week when loading _θValue is with suitable shape stress intensity and the distributing homogeneity problem of opening of reflection saw blade.

The rationally suitable standard of opening of saw blade should be: suitable Zhang Chengdu wants " rationally "; Suitable tension stress distribution at circumferencial direction should be even; The suitable circumferencial direction of opening the back saw blade should be smooth, and Circular Run-out Tolerance should be within corresponding regulation.

Studies have shown that in a large number, for general circular saw blade for wood,, make that to be considered as suitable Zhang Chengdu reasonable as long as suitable increase by 20-40% when opening suitableeer the opening of a natural frequency that makes its minimum critical mode (when general clamping ratio is 0.26-0.46, n=3 mode).Another kind of way is, is " rationally " by trying living suitable Zhang Chengdu of saw of saw identification earlier, measures the natural frequency of this saw blade then, and with its standard as the suitable Zhang Chengdu of same specification saw blade.

For the extraction and analytical approach of the characteristic parameter that characterizes the suitable state of saw blade, can be divided into frequency-domain analysis and time-domain analysis.

Frequency-domain analysis---FFT low pass analysis of spectrum mainly is FFT power spectrum and the amplitude-frequency analysis of spectrum by the response of saw blade impact function, detects the natural frequency of the modal several rank of saw blade mode.Then, by comparing the natural frequency amplitude of variation of the suitable Zhang Qianhou of a saw blade, differentiate the suitable Zhang Chengdu of saw blade.Above-mentioned analysis is based upon on the discrete fourier transform basis.

If X (K) is measured signal, its fourier transform is X (n),

That is: X (n)=DFT[X (k)]

As X (K) when satisfying sampling thheorem, have: $X(n)=\frac{1}{N}\underset{k=0}{\overset{n-1}{\mathrm{\&Sigma;}}}x(k)e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A9410803800221.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;nK}/N}$

0≤n≤N－1

Or: $X(k)=\underset{n=0}{\overset{n-1}{\mathrm{\&Sigma;}}}x(n){\mathrm{<figure-callout\; id="2"\; label="e\; j"\; filenames="A9410803800221.png"\; state="\{\{state\}\}">e</figure-callout>}}^j$

0≤k≤N－1

According to the Ba Shiwa theorem power spectrum P (n) is arranged,

P(n)＝|X(n)| ²＝R ²e[X(n)]＋I ²m[X(n)]

n＝0、1、2、……N－1

Amplitude-frequency spectrum V (n) is: $V\left(n\right)=\sqrt{P\left(n\right)}$

n＝0，1，2……N－1

In detection method of the present invention, finish from analysis of spectrum with a kind of fast algorithm of this conversion.

Time-domain analysis is by Single-chip Controlling, and saw blade certain radius circumferencial direction is not being loaded and loading under two kinds of situations, and transversely deforming amount in the week carries out that sampling analysis carries out.Analysis result, the former is in order to the planarization of statement saw blade circumferencial direction, i.e. Circular Run-out Tolerance, the latter then is the distribution characteristics by the suitable tension stress of rigidity statement.

(1) planarization of detection saw blade circumferencial direction

If the sample function of the transversely deforming in detected saw blade certain radius circumferencial direction one changes is L, sampling number is N, then:

L＝{l ₁、1 ₂，……l _N)

Get lmax=MAX{l ₁l ₂... l _N)

lmin＝MIN{l ₁，?l ₂，……l _N)

Then the maximal value of saw blade Circular Run-out Tolerance is:

M＝lmax－lmin

For the smooth distribution situation of saw blade certain radius circumferencial direction is described, introduce mapping Ф:

Ф：L→B

l|→R＋K(l－l ₁)

That is: B={b| _{B=R+K (l-l1}), l ∈ L, l ₁∈ L)

Wherein: K-amplification coefficient

R-coordinate radius of circle

By above-mentioned mapping, it is radial variations set B on the coordinate circle of radius that the jerk value in saw blade certain radius circumferencial direction one can being changeed be transformed into R.

(2) detecting suitable tension stress distributes

When the saw blade periphery a bit loads, distance load(ing) point θ=90 ° locate circumferencial direction one change in the sample function that obtains of collection transversely deforming amount be D.

D={d ₁, d ₂D _NThen describe and fit the mapping f of tension stress in the distribution characteristics of saw blade circumferencial direction: for

f：D→G

d ₁→ R+K (d-l ₁) promptly: D={d| _{D=R+K (d-l1}), d ∈ D, l ₁∈ L) wherein: K and R are respectively amplification coefficient and coordinate radius of circle.

By top conversion, can obtain the suitable tension stress distribution characteristics of saw blade in one week with this specifically defined rigidity statement.

Based on foregoing, the invention provides a kind of detection method of disc saw, with this method first step can the detection record saw blade each rank natural frequency.At first, with stationary installation fixed circular saw sheet, first detecting head is arranged on the position of the contiguous saw blade of saw blade periphery, then apply impulsive force a definite position, make saw blade produce vibration, gather the vibration signal that saw blade sends by first detecting head, the vibration signal that collects is carried out data processing, draw out the power spectrum P (n) or the amplitude-frequency spectrum V (n) of saw blade subsequently automatically.Can read each rank natural frequency of tested saw blade by in this spectrogram any.The suitable Zhang Chengdu that directly reflects saw blade with above-mentioned natural frequency.Second step was arranged on second detecting head with respect to certain radius place, saw blade center, and probe is contacted with saw blade, and saw blade is rotated, and measured the certain radius circumferencial direction Circular Run-out Tolerance amount of saw blade with second detecting head.Then, saw blade is loaded, make saw blade center on its central axis rotation, the transversely deforming amount data of gathering the certain radius circumferencial direction of saw blade by second detecting head at certain position.Then above-mentioned two kinds of data that collect are handled.Adopt mapping techniques that Circular Run-out Tolerance amount in one commentaries on classics of certain radius circumferencial direction and the transversely deforming quantitative change under the load condition are changed to radius R, the circle coordinates of the demonstration directly perceived of enlargement factor K resemble figure.Resemble figure with above-mentioned two kinds and show the planarization (Circular Run-out Tolerance) of saw blade and suitable tension stress homogeneity respectively at circumferencial direction.

Before circular saw-blade tension or after suitable the opening, repeat above-mentioned detection step, measure each rank mode n=0 respectively, 1,2 ... 6 natural frequency.Then measure at the bottom of the saw blade teeth groove inwardly the transversely deforming amount or the Circular Run-out Tolerance amount of about 5-15 millimeters circumferencial directions respectively in selected position.

In the transversely deforming amount of the certain radius circumferencial direction of measuring saw blade, need load the axis direction almost parallel of the direction of its acting force and saw blade to saw blade.

When saw blade was loaded, the application point of acting force and the angular displacement between the detecting head were approximately 60 °-120 °.

Make the angular displacement of application point distance first detecting head of the vibrative impulsive force of saw blade be approximately 180 °.

Repeat the detection step, drawing each rank mode n=0 of saw blade, 1,2 ... after 6 the natural frequency, carry out the step that the natural frequency to the same single order mode of suitable Zhang Qianhou compares.

In the process of carrying out the natural frequency comparison step, saw blade is under 0.26-0.46 condition at the clamping ratio, and the natural frequency that mode n=3 rationally fits after opening should be than increase by 20-40% before suitable the opening.

The present invention also provides a kind of equipment of implementing above-mentioned detection method, and this equipment comprises mechanical driving device, clamping device, detecting head, wave filter, A/D converter Single Chip Microcomputer (SCM) system, drawing printer and photoimpact device.By clamping device saw blade is fixed on the rotation axis, apply impulsive force with hand hammer to saw blade, gather the vibration signal that saw blade sends by first detecting head, by cable the vibration signal that collects is delivered to wave filter, the vibration signal by wave filter is sent to A/D converter to carry out delivering to Single Chip Microcomputer (SCM) system again after the data-switching and carries out data processing.Also be provided with second detecting head, measure the transversely deforming amount or the Circular Run-out Tolerance amount of the certain radius circumferencial direction of saw blade with second detecting head.The transversely deforming amount of the saw blade certain radius circumferencial direction that second detecting head is collected by cable or the signal of Circular Run-out Tolerance amount are delivered to wave filter, and the signal by wave filter is sent to A/D converter and carries out data-switching.Data after the conversion are sent to Single Chip Microcomputer (SCM) system, after the further respectively data of handling from first and second detecting heads of Single Chip Microcomputer (SCM) system, obtain power spectrum and amplitude-frequency spectrogram respectively by the drawing printer, Circular Run-out Tolerance resemble certain radius circumferencial direction under figure and the stressed effect of saw blade the transversely deforming amount resemble figure.

Described mechanical driving device comprises motor, and by the direct motor drive power wheel, power wheel arrives reducer casing by driving-belt with transmission of power.Saw blade is fixedly mounted on the rotation axis of reducer casing output terminal by clamping device.Described clamping device is made of the screw thread of chuck, nut and rotation axis end.

First detecting head is a non-contact displacement transducer.This sensor support is on sensor stand.Sensor stand can move along guide rail, so that can adjust non-contact displacement transducer in the distance of the end face that is close to saw blade with respect to the central axis of saw blade.Second detecting head is a tangent displacement sensor, and this sensor is installed on the sensor stand, and sensor stand can move along guide rail.

Augmentor comprises boosting-rod, round guide, drag link, rotor wheel, pulley, handle, traction rope, and weight.Boosting-rod is installed on the round guide, and can move along round guide.And can be in the location, appropriate location of round guide.One end of round guide connects the crank in the drag link.The free end of this crank connects an end of connecting rod, and the other end of connecting rod is connected with the free end of crank.Another crank is installed in rotation on the vertical pivot, at an end of vertical pivot afterburning handle and rotor wheel is arranged.One end of traction rope is fixed on the rotor wheel.Traction rope is walked around pulley.One end of traction rope is fixed on the rotor wheel.Traction rope is walked around pulley.The other end of traction rope is provided with weight.Handle can be located under baffle plate is in stress state.

Described photoimpact device comprises photoelectric tube and pulse disc.

The present invention is fit to commercial Application.Can quantize disc saw comprehensively, automatically, the Non-Destructive Testing analysis.Its principal feature is as follows:

1) proposed with suitable Zhang Chengdu, three parameters of planarization of suitable tension stress distribution characteristics, saw blade circumferencial direction are explained the suitable notion of opening state of saw blade comprehensively.

2) on detection technique, choose three indexs of following three parameters as the suitable state of above-mentioned evaluation saw blade:

I, with the suitable Zhang Chengdu of the amplitude of variation statement saw blade of the suitable Zhang Qianhou natural frequency of saw blade;

Under ii, the usefulness saw blade stress state, the transversely deforming amount in one week of edge certain position is explained suitable tension stress distribution characteristics;

Iii, explain a suitable influence of opening to the saw blade planarization with the Circular Run-out Tolerance amount of the suitable successor of opening of saw blade in one week of one radius.

3) adopted advanced scientific approach that the characteristic parameter that proposes is carried out quantitative analysis.

I, adopt be based upon on the basic two complex sequences fft algorithm bases from spectral analysis technology, saw blade is carried out frequency-domain analysis, find out the natural frequency of each rank mould a tree, used in making timber for boats of saw blade;

Ii, employing time domain mapping techniques, saw blade is carried out time-domain analysis, set up also and describe plan view image, set up and describe planes images figure, under statement saw blade Circular Run-out Tolerance and the stress state a certain radial location of saw blade end face is located all internal strain μ 90 these peimage features apart from 90 ° of load(ing) points.

4) checkout equipment provided by the invention has been used machinery, and multinomial technology such as microcomputer, simulation, numeral, electrician have improved the robotization of equipment, intelligent degree.

I, adopt that volume is little, function is strong, reliability is high, price belongs to 8031 minimum in microcomputer family single-chip microcomputers as system handles and control core.Formed application/configuration than the dedicated test system that is bordering on 1.On software design, adopted as digital filtering, multiple method with " soft " generation " firmly " such as numeral amplification etc. has been simplified the hardware configuration of system, greatly reduces cost, has higher P/C ratio;

Ii, be provided with light-emitting diode display, sensor states indication, multiple promptings such as drawing printer, pen recorder.With numeral and curvilinear figure output testing result.And can indicate or point out equipment running status, operating process.Be convenient to user's operation.

Iii, on physical construction, complete saw blade installation way that is virtually reality like reality tallies with the actual situation measurement result.

The embodiment of detection method of the present invention and equipment is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a block scheme of the present invention.

Fig. 2 is the front view of checkout equipment of the present invention.

Fig. 3 is the vertical view of checkout equipment of the present invention.

Fig. 4 is the structural representation of augmentor in the checkout equipment of the present invention.

Fig. 5 is the amplitude frequency diagram before the circular saw-blade tension of being drawn out by printer.

Fig. 6 is the amplitude frequency diagram after the circular saw-blade tension of being drawn out by printer.

Fig. 7 is the graph of relation of Natural Frequency of Circular Saw Zhang Chengdu suitable with it.

Fig. 8 is the planarization of the saw blade drawn out by printer and suitablely opens an inhomogeneity circle coordinates curve map.

Fig. 9 be saw blade in central clamping, when periphery a bit loads, the curve map of different θ angle place deflection.

Can understand critical piece of the present invention by block scheme shown in Figure 1.These parts are mechanical drive and clamping part, optical disc, sensor, wave filter, A/D converter, single-chip microcomputer, function key, Drive and Control Circuit, light-emitting diode display and drawing printer.The equipment that employing is made of above-mentioned parts can be implemented detection method of the present invention.

Adopt method of the present invention, each the rank natural frequency before and after the detection record circular saw-blade tension is composed with the power spectrum or the amplitude-frequency of rectangular coordinate system statement saw blade respectively; Loading and not the transversely deforming amount and the Circular Run-out Tolerance amount of the suitable arbitrary radius circumferencial direction of Zhang Qianhou under the load condition with circle coordinates graphic presentation record saw blade.

In the preferred embodiment of the inventive method, the measured circle saw blade is that diameter is 600mm, and thickness is 2.4mm, and clamping is than the carbon steel saw blade that is 0.3.At first measure the natural frequency of saw blade when suitable state.Adopt stationary installation that saw blade is fixed on the back shaft, then non-contact displacement transducer is arranged on the position of contiguous saw blade, the radial distance between making at the bottom of non-contact displacement transducer and the saw blade teeth groove is approximately 10mm.The about 180 ° position of angular displacement in the above-mentioned position of distance applies impulsive force, make saw blade produce vibration, gather the vibration signal that saw blade sends by non-contact displacement transducer, the vibration signal that collects is delivered to anti-mixing filter, to be sent to A/D converter by the vibration signal of anti-mixing filter again and carry out data-switching, data after the conversion are sent to single-chip microcomputer, these data send to the drawing printer after being handled by single-chip microcomputer, draw out power spectrum P (n) or amplitude-frequency spectrum V (n) can be read saw blade by above-mentioned spectrogram each rank natural frequency by printer.

Saw blade is fitted Zhang Jiagong, and measures its suitable Zhang Chengdu, at this moment can adopt following two kinds of methods:

(1) before suitable of saw blade, measure its each rank natural frequency earlier then by gently opening saw blade (roll extrusion to heavily dividing progressively to fit several times, beat or additive method), all measure the saw blade natural frequency after each suitable opening, up to the natural frequency of this saw blade n=3 or n=4 rank mode is suitable open before increasing degree 20-40%, it is suitable just to be considered as fitting Zhang Chengdu.

As can be known from Fig. 5 and Fig. 6, this saw blade is suitable when opening, and the first rank natural frequency is 39Hz, and the natural frequency on suitable Zhang Houqian two rank is respectively 15Hz and 32Hz.Contrast Fig. 7 as can be known, when saw blade is suitable when opening, the natural frequency of these two lower modes of n=0 and n=1 often mixes, and suitable opening after to a certain degree, this two rank natural frequency is separated, but decline during all than suitable opening.So can assert, this saw blade is fitted n=0 when opening, and the natural frequency of n=1 is 39Hz.Suitable opening under this routine situation, the natural frequency of n=0 is 15Hz, the natural frequency of n=1 is 32Hz.From n=2 rank mode, each rank natural frequency of saw blade after suitable the opening is all more fitted when opening to be increased to some extent, wherein the natural frequency of n=3 is suitable increases before opening approximately 30%, and suitable Zhang Chengdu is reasonable in this explanation, if the natural frequency of n=3 is suitable open after, only increase about 10%, illustrate that suitable Zhang Chengdu is lighter, still, if the increase amplitude surpasses 40%, saw blade " dishization " is obviously certain, and suitable opening excessively is described.

(2) rule of thumb suitable opening assert earlier that by the examination saw tension of this specification saw blade is reasonable or best, measures its natural frequency then.Select n=3, or the natural frequency of n=4 runs into this specification saw blade later on as standard, get final product by suitable the opening of this standard, error should be in ± 5%.

Usually, before or after the natural frequency of having measured saw blade, just can measure the transversely deforming amount of the arbitrary radius circumferencial direction of saw blade, or the face runout amount.

When saw blade has been fixed on the back shaft, back shaft is normally rotatable, tangent displacement sensor is arranged on respect to saw blade center certain radius, and with the saw blade end in contact, in this embodiment, the distance between at the bottom of tangent displacement sensor and the saw blade teeth groove is approximately 10mm.

At first, measure the transversely deforming amount of the certain radius circumferencial direction of saw blade with tangent displacement sensor, make saw blade center on its central axis rotation, edge at saw blade continues to load, and acting force should be controlled at saw blade is no more than within half of saw blade thickness in the transversely deforming amount of this point.And application point and the angular displacement between the tangent displacement sensor in power are located for about 90 °, measure the transversely deforming amount of saw blade in one week, the data that this displacement transducer collects are sent to anti-mixing wave filter, to be sent to A/D converter from the data-signal of wave filter then and carry out data processing, treated data are sent to single-chip microcomputer again, and single-chip microcomputer will be sent to light-emitting diode display and drawing printer through the data of further handling.Light-emitting diode display demonstrates apart from interior transversely deforming quantitative change amplitude of one week of 90 ° of positions of load(ing) point.Owing to adopted mapping techniques, go out the circle coordinates figure by the drawing printer prints, it demonstrates the transversely deforming amount of certain radius circumferencial direction in one week.In this embodiment, the transversely deforming quantitative change in the week being changed to radius is that 10 circle coordinates resemble on the figure for the 35mm enlargement factor.

In the curve map shown in Figure 8, the transversely deforming amount of curve 34 expression certain radius circumferencial directions in one week, the suitable tension stress that it the has illustrated saw blade simultaneously situation that is evenly distributed, its unevenness maximal value is 0.672mm.

Secondly, measure the face runout amount of saw blade certain radius circumferencial direction in one week with tangent displacement sensor.It detects step and saw blade is not applied outside the acting force, and other steps are identical with the transversely deforming amount of detection saw blade certain radius circumferencial direction in one week.Repeat no more for identical part.

The suitable rear end face circular runout of opening of curve 33 expressions in Fig. 8, its maximum jitter amount is 0.508mm.As seen, 120 ° of scope inner curves are very smooth in the lower left corner from this figure, and other parts are relatively poor.General all with the Circular Run-out Tolerance amount tolerance of tested saw blade standard code as the standard of weighing this saw blade planarization.In this preferred embodiment, according to standard code, the Circular Run-out Tolerance tolerance of this saw blade is 0.5mm.Obviously, the Circular Run-out Tolerance amount of curve 33 these figure saw blades of explanation exceeds standard a little among Fig. 8.

Fig. 2-4 depicted in greater detail adopt the equipment structure that saw blade is detected of the present invention.This checkout equipment comprises fuselage 1, augmentor 2, gear train, clamping device and measurement display system.Drawing printer 7 and instrument container 8 are directly installed on the fuselage 1.Also be provided with guide rail 3 on fuselage 1, the slide plate 4 that is supporting displacement transducer can slide along guide rail 3.In the present invention, be provided with two slide plates 4, on these two slide plates 4, tangent displacement sensor 15 and non-contact displacement transducer 13 be installed respectively.Tangent displacement sensor 15 links to each other with slide plate 4 by sensor stand 24.Non-contact displacement transducer 13 links to each other with slide plate 4 by sensor stand 12.Because sensor can be along the vertically moving of the guide rail 3 of fuselage 1, so can adjust sensor 13 and 15 positions with respect to circular saw bench periphery or center.And support 12,24 can rotate, and uses locating device, as screw, and the location.Usually adopt tangent displacement sensor 15 to detect the Circular Run-out Tolerance amount and the transversely deforming amount of the certain radius circumferencial direction of saw blade 6.Detect the natural frequency of saw blade 6 with non-contact displacement transducer 13.Sensor 13 with 15 by lead be connected with instrument container 8 (not shown).In instrument container 8, wave filter is arranged, A/D converter, single-chip microcomputer light-emitting diode display and function key.

Motor 17 is installed in the fuselage 1.Drive power wheel 16 by motor 17.Power wheel 16 arrives wheel box 18 by driving-belt 19 with transmission of power, and the reducer casing 18 that uses in this preferred embodiment is worm type of reduction gearings.The rotating speed of reducer casing 18 output terminal axles 20 is 3rpm in this embodiment, and axle 20 is provided with clamping device 14.Saw blade 6 is installed on the output shaft 20 of reducer casing 18 by clamping device 14.Clamping device 14 is by chuck 22, and nut 21 constitutes with the screw thread 23 that is arranged on output shaft 20 ends.Another output terminal at reducer casing 18 is provided with pulse disc 11.In this embodiment, in fact pulse disc 11 is installed in an end of worm shaft.Photoelectric tube 10 is connected with instrument container 8 by cable.When equipment operation, photoelectric tube 10 matches with pulse disc 11, measures the rotational angle of saw blade.

Augmentor as shown in Figure 4, described augmentor is mainly by handle 5, driving wheel 30, pulley 23, weight 24, vertical pivot 29, drag link, round guide 9 and boosting-rod 26 constitute.One end of handle 5 is installed on the vertical pivot 29.The two ends of vertical pivot 29 are installed in rotation on respectively in the fuselage 1.Driving wheel 30 and crank 27 also are installed on vertical pivot 29.One end of traction rope 31 is fixed on the driving wheel 30, and described traction rope 31 is walked around pulley 23 backs and linked to each other with weight 24.Pulley 23 is installed in the fuselage 1 by back shaft.The free end of crank 27 links to each other with connecting rod 25 by bearing pin.The other end of connecting rod 25 links to each other with the free end of crank 28.The other end of crank 28 links to each other with round guide 29.One end of boosting-rod 26 is installed on the round guide 9, the protruding semi-girder that is of the other end.Boosting-rod 26 can slide up and down along round guide.And can locate with steady arm such as screw.When the operator moves handle 5, can make boosting-rod 26 produce a fixing transverse force.When applying acting force, handle 5 cooperatively interacts with baffle plate 22.Interior locating device such as pin are located handle 5 under afterburning state.Usually, the position at the free end place of boosting-rod 26 is the application points that apply acting force.In this embodiment, the angular displacement between the check point of the free end non-contact displacement transducer of boosting-rod 26 is selected in about 90 °.

The foregoing description only is the detailed description to special case among the present invention.So that the professional has clear and definite understanding to detection method of the present invention and equipment.The content that relates to design of the present invention and ask for protection all is documented in claims.

Claims (12)

1, a kind of detection method of disc saw, with this method can the detection record saw blade each rank natural frequency, at first use stationary installation fixed circular saw sheet, first detecting head is arranged on the position of contiguous saw blade, then apply impulsive force a definite position, make saw blade produce vibration, gather the vibration signal that saw blade sends by first detecting head, the vibration signal that collects is carried out data processing automatically by Single Chip Microcomputer (SCM) system, draw out power spectrum P (n) or amplitude-frequency spectrum V (n) subsequently, and each rank natural frequency of reading saw blade from figure, it is characterized in that: the suitable Zhang Chengdu that directly reflects saw blade with above-mentioned natural frequency, this second probe is arranged on respect to certain radius place, saw blade center and with the saw blade surface and contacts, make saw blade center on its central axis rotation, the certain radius circumferencial direction of being gathered saw blade by second detecting head is in next all transversely deforming amount of load condition and gather the data of the face runout amount of saw blade in one week, then the data that collect are handled, adopting mapping techniques transversely deforming amount that one commentaries on classics of certain radius circumferencial direction is interior or Circular Run-out Tolerance quantitative change to be changed to radius is R, and enlargement factor is that the circle coordinates of the demonstration directly perceived of K resemble figure.

2, according to the described detection method of claim 1, it is characterized in that: before circular saw-blade tension or after suitable the opening, repeat above-mentioned detection step, measure each rank mode n=0,1,2 respectively ... 6 natural frequency is inwardly then measured at the bottom of the saw blade teeth groove Circular Run-out Tolerance amount of scope in about 5-15 millimeter one week and the transversely deforming amount under the load condition respectively.

3, according to claim 1 or 2 described detection methods, it is characterized in that: when the transversely deforming amount of the certain radius circumferencial direction of measuring saw blade, will load the axis direction almost parallel of the direction of its acting force and saw blade saw blade.

4, according to the described detection method of claim 3, it is characterized in that: when saw blade was loaded, the application point of acting force and the angular displacement between the detecting head were approximately 60 °-120 °.

5, according to the described detection method of claim 1, it is characterized in that: about 180 ° of the angular displacement of application point distance first detecting head of described impulsive force.

6, according to the described detection method of claim 2, it is characterized in that: repeating the detection step: draw each rank mode n=0 of saw blade, 1,2 ... after 6 the natural frequency, carry out the step that suitable natural frequency of opening the same single order mode of state front and back is compared.

7, according to the described detection method of claim 6, it is characterized in that; In the process of carrying out the natural frequency comparison step, saw blade is at mode n=3, and clamping is than under 0.26-0.46 condition, and the natural frequency after rationally suitable the opening should increase by 20-40% before fitting the state of opening.

8, the equipment of the described detection method of a kind of enforcement claim 1-7, it comprises: mechanical driving device, clamping device, detecting head, wave filter, A/D converter, Single Chip Microcomputer (SCM) system, drawing printer and photoimpact device, by clamping device saw blade is fixed on the rotation axis, apply impulsive force with hand hammer to saw blade, gather the vibration signal that saw blade sends by first detecting head, by cable the vibration signal that collects is delivered to wave filter, vibration signal by wave filter is transmitted A/D converter and carries out data-switching, and the signal after will changing is delivered to Single Chip Microcomputer (SCM) system and is carried out data processing, it is characterized in that: be provided with second detecting head, measure the transversely deforming amount or the Circular Run-out Tolerance amount of the certain radius circumferencial direction of saw blade with second detecting head, the transversely deforming amount of the saw blade certain radius circumferencial direction that second detecting head is collected by cable or the data-signal of face runout amount are delivered to wave filter, data-signal by wave filter is sent to A/D converter and carries out data-switching, data after the conversion are sent to single-chip microcomputer, after passing through the further processing of single-chip microcomputer from the data of first and second detecting heads respectively, obtain the spectrogram of power spectrum and amplitude-frequency spectrum respectively by the drawing printer, Circular Run-out Tolerance resemble certain radius circumferencial direction under figure and the stressed effect of saw blade the transversely deforming amount resemble figure.

9, according to the described checkout equipment of claim 8, it is characterized in that: described mechanical driving device comprises motor (17), power wheel (16) by motor (17) driving, power wheel (16) arrives wheel box (18) by driving-belt (19) with transmission of power, and saw blade (6) is fixedly mounted on the rotation axis (20) of wheel box (18) output terminal by clamping device (14); Described clamping device (14) is by chuck (22), and the screw thread (23) of nut (21) and rotation axis (20) end constitutes.

10, according to the described checkout equipment of claim 8, it is characterized in that: first detecting head is non-contact displacement transducer (13), this sensor (13) is supported on the sensor stand (12), sensor stand (12) can move along guide rail (3), so that can adjust non-contact displacement transducer (13) in the distance of the end face that is close to saw blade (6) with respect to the central axis of saw blade (6); Second detecting head is tangent displacement sensor (15), and this sensor (15) is installed on the sensor stand (24), and sensor stand (24) can move along guide rail (3).

11, according to the described pick-up unit of claim 8, it is characterized in that: augmentor comprises boosting-rod (26), and round guide (9), boosting-rod (26) are installed on the round guide (9), and can move, and can be in the location, appropriate location of round guide (9) along round guide (9); One end of round guide (9) connects the crank (28) in the drag link, the free end of crank (28) connects an end of connecting rod (25), the other end of connecting rod (25) is connected with the free end of crank (27), crank (27) is installed in rotation on the vertical pivot (29), end at vertical pivot (29) is provided with afterburning handle (5) and rotor wheel (30), one end of traction rope (31) is fixed on the rotor wheel (30), traction rope (31) is walked around pulley (23), the other end at traction rope (31) is provided with weight (24), and handle (5) can be in location under the stress state in baffle plate (22).

12, according to the described checkout equipment of claim 8, it is characterized in that: described photoimpact device comprises photoelectric tube (10) and pulse disc (11).

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