CN102200762B - Numerical control system for contour detection of cam - Google Patents
Numerical control system for contour detection of cam Download PDFInfo
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- CN102200762B CN102200762B CN2011100963903A CN201110096390A CN102200762B CN 102200762 B CN102200762 B CN 102200762B CN 2011100963903 A CN2011100963903 A CN 2011100963903A CN 201110096390 A CN201110096390 A CN 201110096390A CN 102200762 B CN102200762 B CN 102200762B
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- cam
- laser ranging
- numerical control
- guide rail
- displacement sensor
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Abstract
The invention provides a numerical control system for contour detection of a cam. The system which is simple in structure, higher in detection accuracy and higher in efficiency comprises a numerical control rotary table, a guide rail synchronous belt component, a laser ranging head, an optical grating ruler displacement sensor, an encoder and an industrial personal computer, wherein the numerical control rotary table is used for driving the cam to horizontally and coaxially rotate around a vertical mandrel; the guide rail synchronous belt component is horizontally arranged on one side of the numerical control rotary table; the laser ranging head is arranged on a synchronous belt in the guide rail synchronous belt component and arranged on one side of the cam; the optical grating ruler displacement sensor is used for measuring the horizontal displacement of the laser ranging head and detecting a rotary angle of the cam; and the industrial personal computer controls the numerical control rotary table and the guide rail synchronous belt component to move and calculates the outer contour data of the cam according to data which is measured by the laser ranging head, the optical grating ruler displacement sensor and the encoder.
Description
Technical field
The present invention relates to a kind of cam contour detection digital control system.
Background technology
Cam mechanism is widely used in various automated machines, precision instrument, automation control system etc..Accomplish high accuracy, expeditiously detect cam, and correctly handle, evaluate its every error, the method of the quality information of cam, traditional optical-mechanical amount instrument and artificial data processing is rapidly fed back in time, the need for not adapted to the widely used transfer matic production of cam.High speed development and the continuous improvement of manufacturing technology with auto industry, engineering machinery etc., the precision and efficiency of detecting to how to improve cam cutting precision is this area technical barrier to be solved.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of higher cam contour detection digital control system of simple in construction, precision and efficiency of detecting.
In order to solve the above technical problems, the invention provides a kind of cam contour detection digital control system, including：Encoder and industrial computer for the anglec of rotation with moving cam around the laser ranging head of numerical control rotating platform, level located at the guide rail Timing Belt component of numerical control rotating platform side, on the Timing Belt in the guide rail Timing Belt component and in cam side of the vertical horizontal coaxial rotating of heart axle, the grating rule displacement sensor of the horizontal displacement for measuring the laser ranging head, for detecting cam；The industrial computer controls the numerical control rotating platform and the action of guide rail Timing Belt component, and the data measured according to laser ranging head, grating rule displacement sensor and encoder calculate the outline data of cam.
Specifically, the laser ranging head is located on the guide rail in guide rail Timing Belt component by a sliding block, and sliding block is fixedly linked with the Timing Belt；The two ends of the guide rail are provided with belt wheel, and the Timing Belt is on this pair of belt wheel, and one of belt wheel is connected with stepper motor transmission, and the numerical control rotating platform is connected with turntable motor transmission；Industrial computer includes：For the motion control card for controlling the numerical control rotating platform and stepper motor to act in real time, the laser displacement sensor capture card for being used to detect laser ranging and the spacing of the outline of cam in real time being connected with laser ranging head, the encoder to count card being connected with the grating rule displacement sensor and encoder, and the CPU element being connected by system bus with the motion control card, laser displacement sensor capture card and encoder to count card；The motion control card controls the numerical control rotating platform action by the action of a turntable motor driver control turntable motor；Motion control card controls stepper motor to act by a stepper motor driver simultaneously.
It is θ in the anglec of rotation of the camiWhen, spacing i.e. the first pitch measurements of the outline and laser ranging head of the cam measured are
；Meanwhile, the hard zero-bit of the sliding block that grating scale displacement sensor is obtained in the horizontal direction with grating rule displacement sensor
Spacing be that the second pitch measurements are
, i=1,2,3 ... n；While detecting first, second pitch measurements during i rotates a circle for cam
、
Number of times, 0 °≤θi<360°。
The detection method of the cam contour detection digital control system includes：
A）, by laser ranging head and the cylindrical spacing of heart axle be the first spacing
Control in the range of laser ranging head, then detect and record first spacing
, while detect and record the sliding block in the horizontal direction with the hard zero-bit
Spacing be the second spacing
；（Processing and installation accuracy due to the heart axle are easily ensured, therefore only need to detection first spacing
.）
B）, Cam gapless is matched with the heart axle, if the outline data of known cam
, then start control cam rotate a circle while, control laser ranging head opposing cam outline according to
+
Track motion；Meanwhile, control first pitch measurements
All the time in the range in laser ranging head, and the anglec of rotation θ with cam is obtainediCorresponding first, second pitch measurements、
；
C）, by mandrel diametersD and described、
、
、
, calculate the polar diameter measured value of cam
：
D）, by the polar diameter measured value
With the outline data
Compare, draw the outline mismachining tolerance of cam.
Another detection method of the cam contour detection digital control system includes：
a）, by laser ranging head and the cylindrical spacing of heart axle be the first spacing
Control in the range of laser ranging head, then detect and record first spacing
, while detect and record the sliding block in the horizontal direction with the hard zero-bit
Spacing be the second spacing
；
b）, Cam gapless is matched with the heart axle, if the outline data of unknown cam, while starting control cam and rotating a circle, first pitch measurements for control sliding block to be measured according to laser ranging are
Size do straight-line displacement closer or far from cam, to control first pitch measurements
All the time in the range in laser ranging head, and the anglec of rotation θ with cam is obtainediCorresponding first, second pitch measurements
、
；
c）, by mandrel diametersD and described、
、
、
, calculate the polar diameter measured value of cam
：
The present invention has positive effect：（1）The cam contour detection of the present invention uses non-contact measurement method with digital control system, laser ranging head motion carries out horizontal linear displacement by guide rail Timing Belt Component driver, laser ranging head is without mechanical wear in measurement process, compared with existing contact measurement method, with the features such as speed is fast, high precision, precision stability are good.Selected range scope is small（Range starting point~range terminal）Laser ranging head, under conditions of its linearity is constant, measurement error is smaller.The detection of laser ranging head horizontal displacement is completed by grating rule displacement sensor, in the case where the polar diameter of cam is changed greatly, can still obtain higher measurement accuracy, therefore the cost performance of the system is higher；（2）In order to ensure that laser ranging head can be measured in range ability all the time, i.e. the distance of guarantee laser ranging head and cam contour is between range starting point and range terminal, to ensure measurement accuracy, the present invention uses NC Interpolation method, cam rotary motion is linked with laser ranging head horizontal direction linear motion.The anglec of rotation of cam is detected that heart axle is determined in the zero point of circumferencial direction by the zero pulse of encoder by the encoder being connected with heart axle.
Brief description of the drawings
Fig. 1 is the structural representation of the cam contour detection digital control system of the present invention；
Fig. 2 is structure chart when not installing cam of the cam contour detection in Fig. 1 with digital control system.
Embodiment
（Embodiment 1）
See Fig. 1-2, the cam contour detection of the present embodiment is included with digital control system：The encoder 5 and industrial computer of grating rule displacement sensor 4 for the horizontal displacement with moving cam 10 around the numerical control rotating platforms 1 of the vertical horizontal coaxial rotatings of heart axle 1-1, level located at the guide rail Timing Belt component 3 of the side of numerical control rotating platform 1, the laser ranging first 2 on the Timing Belt 3-1 of the guide rail Timing Belt component 3 and in the side of cam 10, for measuring the laser ranging first 2, the anglec of rotation for detecting cam 10；The industrial computer controls the numerical control rotating platform 1 and guide rail Timing Belt component 3 to act, and the data measured according to the laser ranging first 2, grating rule displacement sensor 4 and encoder 5 draw the outline data of cam 10.
As optimal embodiment, axis of the laser that the center line of the guide rail 3-2 and laser ranging first 2 are exported respectively with the heart axle 1-1 intersects vertically.
The industrial computer includes：For the motion control card for controlling the numerical control rotating platform 1 and stepper motor 7 to act in real time, the laser displacement sensor capture card for being used to detect the spacing of the outline of laser ranging first 2 and cam 10 in real time being connected with the laser ranging first 2, the encoder to count card being connected with the grating rule displacement sensor 4 and encoder 5, the CPU element being connected by system bus with the motion control card, laser displacement sensor capture card and encoder to count card, and the LCD for being used to showing and contrasting the outline data of cam 10 being connected through video card with the system bus.
The transmission of the numerical control rotating platform 1 and a turntable motor 6 is connected, and motion control card is by the action of a turntable motor driver control turntable motor 6, and then the action of the control numerical control rotating platform 1；Motion control card controls stepper motor 7 to act by stepper motor driver simultaneously.
It is θ in the anglec of rotation of the cam 10iWhen, the outline of the cam 10 measured is with spacing i.e. the first pitch measurements of laser ranging first 2
；Meanwhile, the hard zero-bit of the sliding block 8 that grating rule displacement sensor 4 is measured in the horizontal direction with grating rule displacement sensor 4
Spacing be that the second pitch measurements are
, i=1,2,3 ... n；While detecting first, second pitch measurements during i rotates a circle for cam 10、
Number of times, n can measure angle gap size according to cam and determine, for example：180th, 360,720 etc., n is bigger, and the outline data of the cam 10 measured are more accurate；0°≤θi<360 °, θi+1-θi=θi-θi-1。
To improve to cam cutting required precision higher part position（Such as the outline data of the lug boss of cam）Accuracy of detection, while as far as possible ensure detection efficiency, may be provided at detection the position when, reduce θi+1And θiDifference.
If the outline data of known cam 10, then the detection method of the cam contour detection digital control system include：
A, by laser ranging first 2 and heart axle 1-1 cylindrical spacing it is the first spacing
Control is in the range of laser ranging first 2（Optimal embodiment is：First spacing
Control is near the range midpoint of laser ranging first 2, because the measuring accuracy highest near range midpoint）, then detect and record first spacing
, while detect and record the sliding block 8 in the horizontal direction with the hard zero-bit
Spacing be the second spacing
；
B, by the blind-mate of cam 10 on the heart axle 1-1, while starting control cam 10 and rotating a circle, control the outline of first 2 opposing cam 10 of laser ranging according to
+Track motion；Meanwhile, control first pitch measurements
All the time in the range in laser ranging first 2（Optimal embodiment is：First spacing
Control is near the range midpoint of laser ranging first 2, because the measuring accuracy highest near range midpoint；）, and obtain the anglec of rotation θ with cam 10iCorresponding first, second pitch measurements、
；
C, by mandrel diametersD and described、
、
、
, calculate the polar diameter measured value of cam 10
：
D, by the polar diameter measured value
With the outline data
Compare, draw the outline mismachining tolerance of cam 10.
If the outline data of unknown cam 10, then the detection method of the cam contour detection digital control system include：
A, by laser ranging first 2 and heart axle 1-1 cylindrical spacing it is the first spacing
Then control detect in the range of laser ranging first 2 and record first spacing
, while detect and record the sliding block 8 in the horizontal direction with the hard zero-bit
Spacing be the second spacing
；
B, by the blind-mate of cam 10 on the heart axle 1-1, while starting control cam 10 and rotating a circle, first pitch measurements for controlling the sliding block 8 to be measured according to laser ranging first 2 are
Size do straight-line displacement closer or far from cam 10, to control first pitch measurementsAll the time in the range in laser ranging first 2, and the anglec of rotation θ with cam 10 is obtainediCorresponding first, second pitch measurements
、
；
C, by mandrel diametersD and described
、
、
、
, calculate the outline data of cam 10, namely polar diameter measured value：
。
High precision laser displacement sensor of the PRIMUS 1000-2 types based on PC of Germany may be selected in above-mentioned laser ranging first 2, and its main performance index is：Range 2mm, range starting point 16mm, range terminal 20mm, range midpoint 18mm；1 μm of the linearity, 0.2 μm of resolution ratio；35 μm of spot diameter.
The encoder to count card is used to record the pulse number that grating rule displacement sensor 4, encoder 5 are produced, and then calculates the nut displacement of guide rail Timing Belt component, the cam anglec of rotation.The nut of motion control card control cam and guide rail Timing Belt component is moved by given trace.
A hard zero-bit is installed on the right side of grating scale 4-2 in grating rule displacement sensor 4, the starting point measured as the measurement distance of grating rule displacement sensor 4.Grating reading head 4-1 is on the sliding block 8.
（Embodiment 2）
On the basis of embodiment 1, the present embodiment has following deformation：
To eliminate the heart axle 1-1 processing or alignment error, the influence to cam contour accuracy of detection, the detection method of the device for detecting cam profile includes：
A, the detection heart axle 1-1 outer rim data：When heart axle 1-1 starts to rotate a circle, the cylindrical spacing by laser measuring head 2 and heart axle 1-1 is the first spacing
All the time control in the range of laser measuring head 2, while it is θ to detect and record with the anglec of rotationiThe first corresponding spacing
And the mover 3-1 in the horizontal direction with the hard zero-bit
Spacing be the second spacing
；
B, by the blind-mate of cam 10 on the heart axle 1-1, if the outline data of known cam 10
, then start control cam 10 rotate a circle while, control the opposing cam 10 of laser measuring head 2 outline according to
+
Track motion；Meanwhile, control first pitch measurements
All the time in the range in laser measuring head 2, and the anglec of rotation θ with cam 10 is obtainediCorresponding first, second pitch measurements
、；
C, by mandrel diametersD and described
、
、
、
, calculate the polar diameter measured value of cam 10
D, by the polar diameter measured value
With the outline data
Compare, draw the outline mismachining tolerance of cam 10.
If the outline data of unknown cam 10
, then the detection method of the device for detecting cam profile include：
A, the detection heart axle 1-1 outer rim data：When heart axle 1-1 starts to rotate a circle, the cylindrical spacing by laser measuring head 2 and heart axle 1-1 is the first spacing
All the time control in the range of laser measuring head 2, while it is θ to detect and record with the anglec of rotationiThe first corresponding spacing
And the mover 3-1 in the horizontal direction with the hard zero-bitSpacing be the second spacing
；
B, by the blind-mate of cam 10 on the heart axle 1-1, if the outline data of unknown cam 10, start control cam 10 rotate a circle while, first pitch measurements for controlling the mover 3-1 of linear electric motors 3 to be measured according to laser measuring head 2 are
Size do straight-line displacement closer or far from cam 10, to control first pitch measurements
All the time in the range in laser measuring head 2, and the anglec of rotation θ with cam 10 is obtainediCorresponding first, second pitch measurements
、
；
C, by mandrel diametersD and described
、
、
、
, calculate the polar diameter measured value of cam 10
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, it can also make other changes in different forms on the basis of the above description.There is no necessity and possibility to exhaust all the enbodiments.And among the obvious change or variation that these spirit for belonging to the present invention are extended out are still in protection scope of the present invention.
Claims (1)
1. a kind of cam contour detection digital control system, it is characterised in that including：For band moving cam（10）Around vertical heart axle（1-1）The numerical control rotating platform of horizontal coaxial rotating（1）, level be located at numerical control rotating platform（1）The guide rail Timing Belt component of side（3）, located at the guide rail Timing Belt component（3）In Timing Belt（3-1）Above and in cam（10）The laser ranging head of side（2）, for measuring the laser ranging head（2）Horizontal displacement grating rule displacement sensor（4）, for detecting cam（10）The anglec of rotation encoder（5）And industrial computer；
The industrial computer controls the numerical control rotating platform（1）With guide rail Timing Belt component（3）Action, and according to the laser ranging head（2）, grating rule displacement sensor（4）And encoder（5）The data measured calculate cam（10）Outline data；
The laser ranging head（2）Pass through a sliding block（8）Located at guide rail Timing Belt component（3）In guide rail（3-2）On, sliding block（8）With the Timing Belt（3-1）It is fixedly linked；The guide rail（3-2）Two ends are provided with belt wheel（3-3）, the Timing Belt（3-1）Located at this pair of belt wheel（3-3）On, and one of belt wheel（3-3）With a stepper motor（7）Transmission is connected, the numerical control rotating platform（1）With a turntable motor（6）Transmission is connected；
The industrial computer includes：For controlling the numerical control rotating platform in real time（1）And stepper motor（7）The motion control card of action, with the laser ranging head（2）Connected is used for detection laser ranging head in real time（2）With cam（10）Outline spacing laser displacement sensor capture card, with the grating rule displacement sensor（4）And encoder（5）Connected encoder to count card, and the CPU element being connected by system bus with the motion control card, laser displacement sensor capture card and encoder to count card；
The motion control card passes through a turntable motor driver control turntable motor（6）Action, and then control the numerical control rotating platform（1）Action；Motion control card controls stepper motor by a stepper motor driver simultaneously（7）Action.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100963903A CN102200762B (en) | 2011-04-17 | 2011-04-17 | Numerical control system for contour detection of cam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100963903A CN102200762B (en) | 2011-04-17 | 2011-04-17 | Numerical control system for contour detection of cam |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102308412A Division CN102722139B (en) | 2011-04-17 | 2011-04-17 | Detection method of numerical control system for detecting contour of cam |
| CN201210226030.5A Division CN102707667B (en) | 2011-04-17 | 2011-04-17 | Cam contour detection method |
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| CN102200762B true CN102200762B (en) | 2012-08-15 |
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| CN103925902B (en) * | 2014-04-08 | 2016-11-02 | 北京工业大学 | A kind of profile error measurement apparatus based on the equidistant model of globoid cam and measuring method |
| CN104627762A (en) * | 2014-12-05 | 2015-05-20 | 中国矿业大学 | Detection system and detection method of friction elevator rope groove wear loss |
| CN104625423B (en) * | 2015-01-21 | 2016-01-20 | 深圳市创鑫激光股份有限公司 | A kind of laser marking control method, laser marking head and laser marking machine |
| CN105278553B (en) * | 2015-10-13 | 2018-09-21 | 华中科技大学 | A kind of dual controller synchronization contour outline control method |
| CN106091944A (en) * | 2016-07-18 | 2016-11-09 | 电子科技大学 | A kind of creep age distance measurement apparatus of suspension insulator |
| CN108534679B (en) * | 2018-05-14 | 2019-08-13 | 西安电子科技大学 | A kind of cylindrical member axis pose without target self-operated measuring unit and method |
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| CN101673485B (en) * | 2009-10-08 | 2010-12-08 | 中北大学 | Cam profile detection and simulation processing experimental device |
| CN102122144B (en) * | 2011-03-04 | 2012-07-25 | 常州工学院 | Numerical control system for detecting cam contours |
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