CN108562255B - Method for extracting contact probe delay signal for online measurement in processing machine tool - Google Patents

Method for extracting contact probe delay signal for online measurement in processing machine tool Download PDF

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CN108562255B
CN108562255B CN201810026450.6A CN201810026450A CN108562255B CN 108562255 B CN108562255 B CN 108562255B CN 201810026450 A CN201810026450 A CN 201810026450A CN 108562255 B CN108562255 B CN 108562255B
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CN108562255A (en
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王雪艳
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Xixian New Area Yushengfa Information Technology Co.,Ltd.
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
    • G01B21/047—Accessories, e.g. for positioning, for tool-setting, for measuring probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
    • G01B21/045—Correction of measurements

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  • A Measuring Device Byusing Mechanical Method (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Machine Tool Sensing Apparatuses (AREA)

Abstract

A method for extracting a contact probe hesitation signal measured on line in a processing machine tool comprises the following steps: first, a contact probe is used to measure the same Y-axis coordinate Y on a measuring bar0In X-axis coordinates ofHighest point B1And the lowest point B2(B1,Y0)，(B2,Y0) The X-axis coordinate at the center of the measuring bar is (B)M,Y1) In which B isM＝(B1+B2)/2，Y1For contact type probe, the X axis of the measuring bar is BMThe measured Y-axis value; secondly, calculating the Y-axis coordinate value Y of the contact probe when the center of the circle is at the center of the measuring bar2，
Figure DDA0002298704820000011
Thirdly, given an initial interval (a, b) and a convergence precision epsilon, a value λ is assigned 0.618 where a is Y2B is a + z, z is the upper limit of the late-call signal, and the coordinates of the lowest point of the dipstick (B) are obtained by tentative measurement using the above parameters2Y) and the coordinates of the highest point (B)1Y); fourthly, calculating the measuring diameter D of the measuring rodMeasuring＝Rsin(B1‑BM)+Rsin(BM‑B2) (ii) a Fifthly, calculating the late signal in the distance direction triggered by the contact probe at the maximum diameter as
Figure DDA0002298704820000012
Late signal in the angular direction is ΔCornerΔ/R. The method has high time-consuming precision.

Description

Method for extracting contact probe delay signal for online measurement in processing machine tool
Technical Field
The invention belongs to the field of machining measurement, and particularly relates to a method for detecting and extracting a late-suspected signal of a contact probe.
Background
Among the mechanical transmission forms, gear transmissions are most widely used. Because of the characteristics of accurate transmission ratio, compact structure, reliable work and the like, the transmission gear has wide application in the fields of machinery and the like, and influences the development level of the whole mechanical industry to a certain extent. With the advent of various high-tech products, in which increasingly demanding precision part machining makes precise use of numerically controlled machine tools and numerically controlled machining centers increasingly important. The detection technology is introduced into the numerical control machine tool, so that an online detection technology is formed, and the gorgeous transformation of the measurement mode is completed: from off-line measurement to on-line measurement. The online detection technology of the numerical control machine tool integrates product design, processing and detection, realizes integration of processing, measurement and finishing, reduces production auxiliary time, improves production efficiency, and greatly improves machining precision.
The on-line measuring device can be divided into contact measurement and non-contact measurement according to different probes, the non-contact measurement generally adopts a laser type measuring method, and although the non-contact measurement can achieve certain measuring accuracy, the requirement on the working environment is high. Taking a gear grinding machine as an example, in the actual gear grinding process, impurities such as cooling liquid and grinding particles can be diffused in the air, and the non-contact measurement precision can be greatly influenced when the gear is measured on line in real time.
For most occasions where the environment in processing is severe and not suitable for laser measurement, compared with a non-contact probe, the contact probe can avoid the influence of impurities in the measurement environment on the measurement result. The trigger probe is equivalent to a lever structure in principle, and a sensor needs to be triggered (equivalent to the switch is disconnected) to send a signal when the trigger probe is in contact with the lever structure. The stylus (arm of force) has a length such that the sensor can be triggered by the stylus after the ball contacts the standard gauge rod, and the longer the stylus, the greater the distance, which causes a delay in the trigger signal, i.e. the inaccuracy of the measurement is caused by the presence of the delay such that the diameter of the gauge rod calculated from the measurement is less than the sum of the diameter of the ball and the diameter of the standard gauge rod. However, the conventional method for measuring the late-call signal has many disadvantages, since the number of measurements is positively correlated with the accuracy and time, i.e. it takes much time to perform multiple measurements to achieve higher accuracy, but it is desirable to take shorter time for actual process generation.
Disclosure of Invention
The invention provides a method for extracting a contact probe delay signal for online measurement in a processing machine tool to solve the problems, and the method takes shorter time to obtain a more accurate measurement result and solves the contradiction between the time and the accuracy.
The method for extracting the delay signal of the contact probe for on-line measurement in the processing machine tool obtains the delay signal of the contact probe by measuring a measuring bar on the processing machine tool through the contact probe, and is characterized by comprising the following steps of:
firstly, measuring the same Y-axis coordinate Y of a measuring rod by using a contact probe0Highest point B of X-axis coordinate1And the lowest point B2And are respectively denoted as (B)1,Y0)，(B2,Y0) The X-axis coordinate at the center of the measuring bar is (B)M,Y1) In which B isM＝(B1+B2)/2，Y1For contact type probe, the X axis of the measuring bar is BMThe measured Y-axis value;
step two, according to the step one, the Y-axis coordinate value Y of the contact probe when the circle center is at the center of the measuring bar is obtained2，
Figure GDA0002298704800000021
Wherein D is the diameter of a known measuring rod, DProbe headThe diameter of the contact probe;
step three, an initial interval (a, b) and convergence accuracy epsilon are given, and lambda is assigned to 0.618 at the same time, wherein a is assigned to Y2B is a + z, z is the upper limit of the late-call signal, and the coordinates of the lowest point of the dipstick (B) are obtained by tentative measurement using the above parameters2Y) and the coordinates of the highest point (B)1,Y)；
Step four, calculating the measuring diameter of the measuring rod according to the trigonometric law
DMeasuring＝Rsin(B1-BM)+Rsin(BM-B2) Wherein R is the rotation radius of the contact probe;
step five, calculating the delay signal triggered by the contact probe at the maximum diameter in the distance direction as
Figure GDA0002298704800000031
Late signal in the angular direction is ΔCorner＝Δ/R。
The method for extracting the on-line measurement contact probe late-doubt signal in the processing machine tool provided by the invention can also have the characteristics that the tentative measurement process in the third step comprises the following steps:
step S3-1, which is to say, let the X-axis coordinate α 1 be b- λ (b-a), α 2 be b + λ (b-a);
and step S3-2, the corresponding contact probes respectively measure the Y-axis coordinates of Y1, Y2,
step S3-3, comparing the sizes of Y1 and Y2, if Y1 is more than or equal to Y2, and a is α 1 and b is still the original b, α 1 is α 2, α 2 is a + λ (b-a), and the corresponding touch probes respectively measure Y2 and Y3 as the corresponding Y-axis coordinates, and if Y1 is less than Y2, a is the original a and b is α 2, α 2 is α 1, and α 1 is b- λ (b-a);
step S3-4, calculating and judging
Figure GDA0002298704800000032
And is
Figure GDA0002298704800000033
Whether it is true, if so, outputting the variable
Figure GDA0002298704800000034
And ending, if not, entering the next step;
step S3-5, if
Figure GDA0002298704800000035
And is
Figure GDA0002298704800000036
If not, the process returns to step S3-2 until the end.
The method for extracting the on-line measurement contact probe late-suspected signal in the processing machine tool provided by the invention can also have the following characteristics that: wherein the upper limit value z of the late-suspected signal is 0.1-0.3.
Action and Effect of the invention
According to the method for extracting the contact probe late-suspected signal measured on line in the processing machine tool provided by the invention, because a golden section method (also called as 0.618 method) in a one-dimensional search heuristic method is used, the heuristic method is established on the basis of the principle of an interval elimination method, namely, a search interval [ a, b ]]Two points α are inserted properly1、α2And calculating its function value α1、α2The interval is divided into three sections), the single valley property of the function is applied, one section is deleted through comparison of the function values, and the search interval is shortened; then, the same processing is carried out on the reserved interval, and the iteration is carried out, so that the search interval is searchedAnd (4) infinitely reducing to obtain a numerical approximate solution of the minimum point. By the method, the measurement process is always forward to the final result, no unnecessary travel is caused, the data points are fewer than the data points measured by the commonly used random point taking detection method, the result is more accurate, and the actual application requirement of short time and good effect is met.
Drawings
FIG. 1 is a schematic diagram showing a comparison of the fitted circles of gauge bars and the circles theoretically traveled by the probe;
FIG. 2 is an experimental flow chart of the method for extracting the on-line measured contact probe late-suspected signal in the processing machine tool of the present invention;
FIG. 3 is a schematic diagram of a contact probe measuring gauge rod in the method for extracting an on-line measuring contact probe hesitation signal in a processing machine tool according to the present invention, wherein a is a front view and b is a top view; and
FIG. 4 is a schematic diagram of the steps of a heuristic measurement.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the efficacy of the invention easy to understand, the following embodiments specifically describe the using effects of the principle steps of the method for extracting the on-line measurement contact probe late-doubt signal in the processing machine tool of the invention by combining the attached drawings.
Examples
FIG. 1 is a schematic diagram showing a comparison of the fitted circles of the gauge bars and the circles theoretically traveled by the probe.
The present embodiment takes an L300G gear grinding machine as an example.
The structural parameters of the L300G gear grinding machine are inquired and actually measured, and the rotating radius of a contact type probe on the machine tool is known to be R, and the diameter of the contact type probe is known to be DProbe headExperiments verify that the rotation center of the probe is in the central plane where the measuring rod is located, and the diameter of the standard measuring rod is D.
By inquiring the design principle of the contact probe, the known contact probe has a sensor inside, when the probe is contacted, a signal enters a counting system, a grating counter at the moment is latched and sent to a computer, and a delay phenomenon of signal transmission exists in the period.
Through an actual walking experiment, as shown in fig. 1, a circle fitted by a measuring point is smaller than a circle walked by a theoretical probe, the phenomenon of signal delay of the contact probe is verified, and meanwhile, the walking experiment and the fig. 1 can calculate and obtain an upper limit value z of a delay signal of the contact probe on the machine tool, wherein the upper limit value z is 0.1-0.3, and the experiment shows that the upper limit value z is 0.2.
Fig. 2 is an experimental flow chart of the method for extracting the contact probe late-suspected signal measured on line in the processing machine tool according to the invention.
The flow chart for extracting the probe late-call signal is shown in fig. 2, the rotation radius R of the probe is measured through the geometry of the online measuring device, and the key point of the invention is how to measure the value of the probe at the maximum diameter of the measuring rod, namely, at the highest point and the lowest point of the measuring rod.
Fig. 3 is a schematic diagram of a contact probe measuring gauge rod in the method for extracting an online measuring contact probe hesitation signal in a processing machine tool according to the present invention, wherein a is a front view, and b is a top view.
As shown in fig. 3, the value of the contact probe at the maximum diameter of the measuring stick, i.e. at the highest point and the lowest point of the measuring stick, such as the probe calibration point 1 and the probe calibration point 2 shown in fig. 3, is obtained by measuring the coordinate values of the highest point and the lowest point of the measuring stick for a plurality of times.
After the above preparation work is completed, the actual operation is as follows.
Step one, as shown in FIG. 3, a contact probe is used to measure the same Y-axis coordinate Y on the gauge bar0Highest point B of X-axis coordinate1And the lowest point B2And are respectively denoted as (B)1,Y0)，(B2,Y0) The X-axis coordinate at the center of the measuring bar is (B)M,Y1) In which B isM＝(B1+B2)/2，Y1For contact type probe, the X axis of the measuring bar is BMThe measured Y-axis value.
Step two, according to the step one, the Y-axis coordinate value Y of the contact probe when the circle center is at the center of the measuring bar is obtained2，
Figure GDA0002298704800000061
Wherein D is the diameter of a known measuring rod, DProbe headThe diameter of the contact probe.
Step three, an initial interval (a, b) and convergence accuracy epsilon are given, and lambda is assigned to 0.618 at the same time, wherein a is assigned to Y2B is a + z, z is the upper limit of the late-challenge signal, here 0.2, and the lowest point coordinate of the dipstick (B) is obtained by a tentative measurement using the above parameters2Y) and the coordinates of the highest point (B)1,Y)。
FIG. 4 is a schematic diagram of the steps of a heuristic measurement.
Wherein the tentative measurement preferably yields the nadir Y-axis coordinate Y of the dipstick using the golden section method, the process comprising the following minor steps:
step S3-1, which is to say, let the X-axis coordinate α 1 be b- λ (b-a), α 2 be b + λ (b-a);
and step S3-2, the corresponding contact probes respectively measure the Y-axis coordinates of Y1, Y2,
step S3-3, comparing the sizes of Y1 and Y2, if Y1 is more than or equal to Y2, and a is α 1 and b is still the original b, α 1 is α 2, α 2 is a + λ (b-a), and the corresponding touch probes respectively measure Y2 and Y3 as the corresponding Y-axis coordinates, and if Y1 is less than Y2, a is the original a and b is α 2, α 2 is α 1, and α 1 is b- λ (b-a);
step S3-4, calculating and judging
Figure GDA0002298704800000062
And is
Figure GDA0002298704800000063
Whether it is true, if so, outputting the variable
Figure GDA0002298704800000064
And ending, if not, entering the next step;
step S3-5, if
Figure GDA0002298704800000065
And is
Figure GDA0002298704800000066
If not, the process returns to step S3-2 until the end.
Step four, calculating the measuring diameter of the measuring rod according to the trigonometric law
DMeasuring＝Rsin(B1-BM)+Rsin(BM-B2) Wherein R is the rotation radius of the contact probe;
step five, calculating the delay signal triggered by the contact probe at the maximum diameter in the distance direction as
Figure GDA0002298704800000071
Late signal in the angular direction is ΔCorner＝Δ/R。
Effects and advantageous effects of the embodiments
According to the method for extracting the contact probe hesitation signal for on-line measurement in the processing machine tool provided by the embodiment, the golden section method (also called 0.618 method) in the one-dimensional search heuristic method is a heuristic method based on the principle of interval elimination, namely, the search interval [ a, b ]]Two points α are inserted properly1、α2And calculating its function value α1、α2The interval is divided into three sections), the single valley property of the function is applied, one section is deleted through comparison of the function values, and the search interval is shortened; and then, carrying out the same processing on the reserved interval, and iterating in such a way, so that the search interval is infinitely reduced, and a numerical approximation solution of the minimum point is obtained. By the method, the measurement process is always forward to the final result, no unnecessary travel is caused, the data points are fewer than the data points measured by the commonly used random point taking detection method, the result is more accurate, and the actual application requirement of short time and good effect is met.

Claims (3)

1. A method for extracting a touch probe late-suspected signal measured on line in a processing machine tool is characterized in that the late-suspected signal of the touch probe is obtained by measuring a measuring bar on the processing machine tool through the touch probe, and the method comprises the following steps:
firstly, measuring the same Y-axis coordinate Y of the measuring bar by using the contact probe0Highest point B of X-axis coordinate1And the lowest point B2And are respectively denoted as (B)1,Y0)，(B2,Y0) The X-axis coordinate at the center of the measuring bar is (B)M,Y1) In which B isM＝(B1+B2)/2，Y1The X axis of the measuring bar is B for the contact type probeMThe measured Y-axis value;
step two, according to the step one, the Y-axis coordinate value Y of the circle center of the contact probe at the center of the measuring bar is obtained2，
Figure FDA0002298704790000011
Wherein D is the known diameter of the measuring rod, DProbe headIs the diameter of the contact probe;
step three, an initial interval (a, b) and convergence accuracy epsilon are given, and lambda is assigned to 0.618 at the same time, wherein a is assigned to Y2B is a + z, z is the upper limit value of the late-suspected signal, and the lowest point coordinate (B) of the measuring bar is obtained by performing tentative measurement by using the parameters2Y) and the coordinates of the highest point (B)1,Y)；
Step four, calculating the measuring diameter D of the measuring rod according to the trigonometric lawMeasuring＝R sin(B1-BM)+Rsin(BM-B2) Wherein R is the radius of rotation of the contact probe;
step five, calculating the delay signal triggered by the contact probe at the maximum diameter in the distance direction as
Figure FDA0002298704790000012
Late signal in the angular direction is ΔCorner＝Δ/R。
2. The method for extracting the on-line measurement contact probe hesitation signal in the processing machine tool according to claim 1, wherein the tentative measurement in step three comprises:
step S3-1, which is to say, let the X-axis coordinate α 1 be b- λ (b-a), α 2 be b + λ (b-a);
and step S3-2, the corresponding contact probes respectively measure the Y-axis coordinates of Y1, Y2,
step S3-3, comparing the sizes of Y1 and Y2, if Y1 is more than or equal to Y2, and a is α 1 and b is still the original b, α 1 is α 2, α 2 is a + λ (b-a), and the corresponding touch probes respectively measure Y2 and Y3 as the corresponding Y-axis coordinates, and if Y1 is less than Y2, a is the original a and b is α 2, α 2 is α 1, and α 1 is b- λ (b-a);
step S3-4, calculating and judging
Figure FDA0002298704790000021
And is
Figure FDA0002298704790000022
Whether it is true, if so, outputting the variable
Figure FDA0002298704790000023
And ending, if not, entering the next step;
step S3-5, if
Figure FDA0002298704790000024
And is
Figure FDA0002298704790000025
If not, the process returns to step S3-2 until the end.
3. The method for extracting the contact probe hesitation signal measured on line in the processing machine tool according to claim 1, wherein the method comprises the following steps:
wherein the upper limit value z of the late-suspected signal is 0.1-0.3.
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