CN115782144A - Linear repeated positioning precision measuring method for fiber winding machine - Google Patents

Linear repeated positioning precision measuring method for fiber winding machine Download PDF

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CN115782144A
CN115782144A CN202211459448.0A CN202211459448A CN115782144A CN 115782144 A CN115782144 A CN 115782144A CN 202211459448 A CN202211459448 A CN 202211459448A CN 115782144 A CN115782144 A CN 115782144A
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hemisphere
calibration
height difference
dial indicator
winding
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孙守政
秦若森
韩振宇
张鹏
贾力伟
富宏亚
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

The invention provides a linear repeated positioning precision measuring method for a fiber winding machine, which comprises the following steps: drawing a winding track, installing a calibration hemisphere on the winding track, and acquiring the maximum height difference h of the dial indicator in the process of crossing the calibration hemisphere for the first time 1 And the maximum height difference h of the indication in the process of N crossing the calibration hemisphere 2 Calculating the maximum height difference of one h 1 Time-corresponding micrometer gauge measuring head sphere center and maximum height difference of two hours 2 And the horizontal distance S between the corresponding micrometer gauge measuring head sphere centers is the linear repeated positioning precision. The invention can accurately, quickly and simply realize the measurement of linear repeated positioning precision, has simple operation process and easy implementation, can be smoothly operated by common operators, and can be applied to fiber laying, fiber belt laying and 3D beatingThe linear repeated positioning precision is measured in the processes of printing and the like.

Description

Linear repeated positioning precision measuring method for fiber winding machine
Technical Field
The invention relates to the technical field of debugging of manufacturing equipment for fiber winding forming composite materials, in particular to a linear repeated positioning precision measuring method for a fiber winding machine.
Background
The continuous fiber reinforced composite material has the advantages of high specific strength, small specific gravity, in-situ curing and the like, is increasingly widely applied in the fields of aerospace, weaponry and the like, and gradually becomes a new material for replacing the traditional polymer, thermosetting composite material and metal. The fiber winding process has incomparable cost and efficiency advantages compared with other composite material forming modes in the aspects of preparing various pipelines, pressure vessels and the like, and the forming process mainly comprises two steps of yarn guiding and heating winding: the fiber yarn is fed into the yarn guide device by the yarn feeding roller, is guided out from the yarn nozzle, and finally is driven by the movement of the yarn nozzle to be distributed on the core mold according to a set track, so that the winding process is completed. The linear repeated positioning precision determines the forming precision of a winding track, the performance of a winding part is directly influenced, the distance between adjacent fiber bundles is uncontrollable due to too low precision, fiber stacking or gap arrangement is caused, and products with high surface quality, high strength and high fatigue resistance can be produced only when the linear repeated positioning precision is high.
At present, the measurement of the linear repeated positioning accuracy of the fiber winding machine is mainly the marking inspection, the method is that a fine marking needle is arranged on a winding trolley, after the winding procedure is started, the marking needle carries out marking on the surface of a mould, and the marking position deviation when the winding is repeated is inspected; and secondly, spreading paper on the surface, marking by using a reverse-mounted flexible ball pen, and checking the position deviation of the handwriting when repeatedly winding. The first method belongs to destructive testing, damages the surface of the die, and is not suitable for high-precision dies with higher cost. The handwriting width of the second method is generally more than 0.5mm, while the winding precision is generally 0.1mm, which is not suitable for winding forming requiring higher linear precision. In addition, the two methods have common defects that the existing filament winding machine cannot be used for accurately and cheaply measuring the linear repeated positioning precision, the existing method is seriously dependent on the skill level of operators, and the defects of large measurement error, low measurement efficiency and the like exist.
Disclosure of Invention
At least to solve one or more of the problems mentioned in the background, the present invention is directed to a linear repositioning accuracy measurement method for a filament winding machine.
In order to achieve the above object, the present invention adopts the following technical solutions.
A method for measuring the linear repeated positioning precision of a filament winding machine comprises the following steps:
step 1, drawing a winding track according to an actual winding path, and performing subsequent winding according to the winding track, wherein each time one layer of winding is finished, the winding is performed from the starting point to the end point of the winding track;
step 2, installing a calibration hemisphere at the center line of the specified position on the winding track;
step 3, fixing the dial indicator with the measuring head radius r at the filament outlet of the fiber winding machine, operating the fiber winding machine to complete single-layer winding for the first time, and acquiring the maximum height difference h of the dial indicator in the process of crossing the calibrated hemisphere for the first time 1 ；
And 4, continuously operating the fiber winding machine, winding for a plurality of times again or continuously, and acquiring the maximum height difference two h of the indication of the dial indicator in the process of crossing the calibrated hemisphere for the Nth time 2 ；
Step 5, calculating the maximum height difference h 1 Time-corresponding micrometer gauge measuring head sphere center and maximum height difference of two hours 2 And the horizontal distance S between the spherical centers of the measuring heads of the corresponding dial indicator is the linear repeated positioning precision.
Preferably, the step 1 specifically comprises: firstly, setting a winding path program, then fixing a marking pen on a wire outlet nozzle of a winding trolley, then running the winding path program, and drawing a winding track on the surface of a core mould by using the marking pen.
In order to further improve the accuracy of the measurement result of the linear repeated positioning precision, the step 2 specifically comprises: and selecting a proper calibration hemisphere, wherein the radius of the calibration hemisphere is R, fixing the calibration hemisphere at the specified position on the winding track, and ensuring that the center of the calibration hemisphere is superposed with the central line of the specified position on the winding track.
In order to further improve the accuracy of the measurement result of the linear repeated positioning precision, the step 3 specifically comprises: replacing the marking pen with a dial indicator, adjusting the position of the dial indicator to enable a measuring head of the dial indicator to be positioned at the junction of the edge of the calibrated hemisphere and the core mold and to be in contact with the surface of the core mold, and then carrying out zero setting operation on the dial indicator; then operating a fiber winding machine to complete single-layer winding, and recording the maximum height difference h of the dial indicator in the process of crossing the calibrated hemisphere for the first time 1 。
Preferably, in step 4, winding is continuously performed 3-5 times, and the average value or the maximum value of the maximum height difference of the index is used as the maximum height difference of two hours 2 。
Preferably, the calibrated hemisphere is fixed at the center line of the designated position on the winding track by means of bonding or screwing.
Preferably, the radius of the calibrated hemisphere is not greater than 10mm, and more preferably, the radius of the calibrated hemisphere is 1mm to 2mm.
In the invention:
when the maximum height difference is one h 1 Corresponding to the vertex and corresponding to the maximum height difference of two h 2 On the inner side or the outer side, linear repeated positioning accuracy is obtained by adopting formula (I) calculation
Figure DEST_PATH_IMAGE002
；
Figure DEST_PATH_IMAGE004
……………（Ⅰ）
When the maximum height difference is two h 2 Corresponding to the vertex and having a height difference of h with respect to the maximum 1 On the inner side or the outer side, linear repeated positioning accuracy is obtained by adopting formula (II) calculation
Figure DEST_PATH_IMAGE006
；
Figure DEST_PATH_IMAGE008
……………（Ⅱ）
When the maximum height difference is one h 1 Maximum height difference of two h 2 Calculating by adopting a formula (III) to obtain linear repeated positioning precision AD corresponding to the same side of the vertex;
Figure DEST_PATH_IMAGE010
………（Ⅲ）
when the maximum height difference is one h 1 Maximum height difference of two h 2 Corresponding to two sides/different sides (different sides) of the vertex, and calculating by adopting a formula (IV) to obtain linear repeated positioning precision AD';
Figure DEST_PATH_IMAGE012
………（Ⅳ）
in the formula, R represents the radius of a calibration hemisphere, and R represents the radius of a measuring head of a dial indicator.
In order to realize the measurement of the linear repeated positioning precision more accurately, quickly and simply, the linear repeated positioning device also comprises a controller, wherein the controller is connected with an optical fiber amplifier and a vision system, the vision system is used for identifying the reading of the dial indicator, an optical fiber sensor matched with the optical fiber amplifier is arranged on the side of the calibration hemisphere, and when a measuring head of the dial indicator moves to the plane of the central section of the calibration hemisphere vertical to the central line, the sensing light rays emitted by the optical fiber sensor just act on the rod body of the dial indicator; the controller comprises a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the following steps/functions when executing the program:
s1, when a measuring head of a dial indicator moves to a plane where a central section of a calibrated hemisphere perpendicular to the central line is located, sensing a rod body of the dial indicator by an optical fiber sensor, and feeding back a sensing signal to a controller through an optical fiber amplifier;
s2, at the moment that the controller receives the induction signal, reading of the dial indicator is obtained through a vision system;
s3, judging the relative position of the rod body of the dial indicator according to the obtained induction signal (the horizontal distance/numerical value corresponding to the induction signal is substantial);
and S4, calling a corresponding calculation model according to the obtained reading and the relative position, and calculating and outputting the linear repeated positioning precision.
Further, in step S3: defining a horizontal distance corresponding to an induction signal obtained when a calibration hemisphere measuring head is positioned at the vertex of a calibration hemisphere as a preset threshold value; (1) When the optical fiber amplifier is arranged on the right side of the calibration hemisphere, if the horizontal distance corresponding to the obtained sensing signal is larger than a preset threshold value, the dial gauge rod body is positioned on the left side of the vertex of the calibration hemisphere, and if the horizontal distance corresponding to the obtained sensing signal is smaller than the preset threshold value, the dial gauge rod body is positioned on the right side of the vertex of the calibration hemisphere; or, (2) when the optical fiber amplifier is installed on the left side of the calibration hemisphere, if the horizontal distance corresponding to the obtained sensing signal is greater than the preset threshold value, it indicates that the dial indicator rod body is located on the right side of the vertex of the calibration hemisphere, and if the horizontal distance corresponding to the obtained sensing signal is less than the preset threshold value, it indicates that the dial indicator rod body is located on the left side of the vertex of the calibration hemisphere.
Has the beneficial effects that: the linear repeated positioning precision is measured by means of the calibration hemisphere and the dial indicator, the method belongs to nondestructive measurement, the defects of large measurement error, low measurement efficiency and the like of the existing manual marking inspection method can be effectively avoided, and the measurement precision of the linear repeated positioning precision can be greatly improved; the invention uses the calibration hemisphere as the measuring reference, the size of the calibration hemisphere can be flexibly changed according to the size of the core mold, the measuring position can be flexibly set, and the application range of the invention is enlarged; the invention can accurately, quickly and simply realize the measurement of linear repeated positioning precision, has simple operation procedure and easy implementation, and can be smoothly operated by common operators; the invention can be applied to the processes of fiber filament laying, fiber tape laying, 3D printing and the like to measure the linear repeated positioning precision.
Drawings
FIG. 1 is a schematic diagram of a winding trajectory drawn in the example;
FIG. 2 is a schematic diagram of the installation position of the calibration hemisphere of the embodiment, wherein the cross-sectional position of the diagram shows a plane of the central cross-section of the calibration hemisphere perpendicular to the center line of the designated position on the winding track;
FIG. 3 is a schematic diagram showing three different relative position relationships of the dial indicator in the embodiment, wherein (a) the vertex position, (b) the same side position, and (c) the different side positions are shown, the rod bodies of the dial indicator in the diagram (from left to right) respectively show the zero setting state of the dial indicator, and the dial indicator counts the maximum height difference of one h in the process of crossing the calibration hemisphere 3 for the first time 1 In the time state, the dial indicator counts the maximum height difference of two h in the process of crossing the calibration hemisphere 3 for the Nth time 2 The state of time;
FIG. 4 shows the maximum height difference of one h in the embodiment 1 Corresponding to the vertex and having a height difference of two h with respect to the maximum height 2 A state on the outside (right side in the figure);
FIG. 5 shows the maximum height difference of one h in the embodiment 1 Corresponding to the vertex and having a height difference of two h with respect to the maximum height 2 A state on the inside;
FIG. 6 shows the maximum height difference of two h in the embodiment 2 Corresponding to the vertex and having a height difference of h with respect to the maximum 1 A state on the outside;
FIG. 7 shows the maximum height difference of two h in the example 2 Corresponding to the vertex and having a height difference of h with respect to the maximum 1 A state on the inside;
FIG. 8 shows the maximum height difference of one h in the embodiment 1 Maximum height difference of two h 2 All corresponding to the state of the same side of the vertex;
FIG. 9 shows the maximum height difference of one h in the embodiment 1 Maximum height difference of two hours 2 All corresponding to the state of the opposite side (different side) of the vertex;
fig. 10 to 12 show the state where the sensing light from the fiber sensor of example 2 just acted on the rod body of the dial indicator.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the following embodiments are only used for understanding the principle of the present invention and the core idea thereof, and do not limit the scope of the present invention. It should be noted that modifications to the invention as described herein, which do not depart from the principles of the invention, are intended to be within the scope of the claims which follow.
Example 1
A linear repositioning accuracy measurement method for a filament winding machine, comprising the steps of:
step 1, drawing a winding track 2 according to an actual winding path;
specifically, the method comprises the following steps: firstly, setting a winding path program, then fixing a marking pen on a wire outlet nozzle of a winding trolley, running the winding path program, and drawing a winding track 2 on the surface of a core mold 1 by using the marking pen, as shown in figure 1;
when the subsequent winding is carried out, the winding is carried out according to the winding track 2, and each time one layer of winding is finished, the winding is carried out from the starting point to the end point of the winding track 2;
step 2, installing a calibration hemisphere 3 at the center line of the specified position on the winding track 2;
specifically, the method comprises the following steps: selecting a proper calibration hemisphere 3 according to the size of the core mold 1, wherein the radius of the calibration hemisphere 3 is R, fixing (bonding) the calibration hemisphere 3 at a specified position on the winding track 2 as shown in FIG. 2, ensuring that the center of the calibration hemisphere 3 is superposed with the center line of the specified position on the winding track 2, and completely attaching the bottom surface of the calibration hemisphere 3 to the surface of the core mold 1;
step 3, fixing the dial indicator with the radius r at the filament outlet of the filament winding machine, operating the filament winding machine to complete single-layer winding for the first time, namely simulating and winding a layer of silk thread along the winding track 2, and acquiring the maximum height difference h of the dial indicator in the process of crossing the calibration hemisphere 3 for the first time 1 ；
Specifically, the method comprises the following steps: replacing the marker pen with a dial indicator, adjusting the position of the dial indicator to enable a measuring head 4 of the dial indicator to be positioned at the junction of the edge of the calibration hemisphere 3 and the core mold 1 and to be in contact with the surface of the core mold 1, and then carrying out zero position adjustment operation on the dial indicator; then, operating a fiber winding machine to finish single-layer winding, and recording the maximum height difference h of the dial indicator in the process of crossing the calibration hemisphere 3 for the first time 1 。
And 4, continuously operating the fiber winding machine, winding again, and acquiring the maximum height difference two h of the dial indicator in the process of crossing the calibrated hemisphere 3 for the 2 nd time 2 ；
Step 5, calculating the maximum height difference h 1 The sphere center of the measuring head 4 of the dial gauge corresponding to the time and the maximum height difference are two hours 2 The horizontal distance S between the centers of the corresponding dial gauge measuring heads 4 is the linear repeated positioning precision;
as shown in FIG. 3, the height differences are h 1 、h 2 The schematic diagram of three different position relationships of the time dial indicator, and the part (a) in fig. 3 shows that the measuring head 4 of the time dial indicator is positioned at the vertex, and h is the moment 1 = R or h 2 = R or h 1 =h 2 The dial gauge measuring head 4 passes through the vertex of the calibration hemisphere 3, and the condition is called as vertex position, (b) part of the dial gauge measuring head 4 is located at the same side of the vertex, and (c) part of the dial gauge measuring head 4 is located at the different side of the vertex; in the measuring process, when the measuring head 4 of the dial indicator moves to the plane (namely the interface position in fig. 2) where the central section of the calibration hemisphere 3 is positioned, wherein the plane is vertical to the central line (the central line of the specified position on the winding track 2, namely the central line of the winding track 2 of the installation position of the calibration hemisphere 3), the readings are respectively h 1 、h 2 When h1, h2 and the vertex are on the same plane;
next, a calculation model will be described for each of several cases, where R denotes the radius of the calibration hemisphere 3 and R denotes the radius of the dial gauge head 4, as follows:
（1）
when the maximum height difference is one h 1 Corresponding to the vertex and having a height difference of two h with respect to the maximum height 2 On the outside, as shown in fig. 4, in this case the calibrated hemisphere 3 and the height difference are respectively h 1 、h 2 The distance between the centers of the measuring heads 4 of the dial gauge is O 2 O 32 = R + R, the vertical distance between the micrometer measuring head 4 and the zero position of the micrometer gauge at the position of the vertex of the non-calibrated hemisphere 3 is DO 32 =r+h 2 (ii) a The height difference is h 1 、h 2 The horizontal distance between the measuring heads 4 of the time dial indicator is
Figure DEST_PATH_IMAGE014
This formula is defined as formula (I) or computational model (I);
when the maximum height isDegree difference of one h 1 Corresponding to the vertex and corresponding to the maximum height difference of two h 2 On the inside, as shown in fig. 5, in this case the calibrated hemisphere 3 has a height difference h from the inside, respectively 1 、h 2 The distance between the centers of the measuring heads 4 of the dial gauge is O 2 O 32 = R + R, the vertical distance between the micrometer measuring head 4 and the zero position of the micrometer gauge at the position of the vertex of the non-calibrated hemisphere 3 is DO 32 =r+h 2 (ii) a Then the height difference is respectively h 1 、h 2 The horizontal distance between the measuring heads 4 of the time dial indicator is
Figure 720318DEST_PATH_IMAGE014
This formula is defined as formula (I) or a computational model (I);
when the maximum height difference is two h 2 Corresponding to the vertex and having a height difference of h with respect to the maximum 1 On the outside, as shown in fig. 6, in this case the calibrated hemisphere 3 and the height difference are respectively h 1 、h 2 The distance between the measuring heads 4 of the dial indicator is O 2 O 31 = R + R, the vertical distance between the micrometer gauge head 4 and the micrometer zero position at the position of the non-positioned calibrating hemisphere 3 top point is AO 31 =r+h 1 (ii) a The height difference is h 1 、h 2 The horizontal distance between the measuring heads 4 of the time dial indicator is
Figure DEST_PATH_IMAGE016
Defining the formula as formula (II) or a calculation model (II);
when the maximum height difference is two h 2 Corresponding to the vertex and having a height difference of h with respect to the maximum 1 On the inside, as shown in fig. 7, the calibrated hemisphere 3 and the height difference are respectively h 1 、h 2 The distance between the measuring heads 4 of the dial indicator is O 2 O 31 = R + R, the vertical distance between the micrometer gauge head 4 and the micrometer zero position at the position of the non-positioned calibrating hemisphere 3 top point is AO 31 =r+h 1 (ii) a The height difference is h 1 、h 2 The horizontal distance between the measuring heads 4 of the time dial indicator is
Figure 699775DEST_PATH_IMAGE016
Defining the formula as formula (II) or a calculation model (II);
（2）
when the maximum height difference is one h 1 Maximum height difference of two hours 2 All corresponding to the same side of the vertex, as shown in fig. 8, in this case, the calibrated hemisphere 3 and the height difference are h 1 、h 2 The distance between the centers of the measuring heads 4 of the dial gauge is O 2 O 31 =R+r、O 2 O 32 = R + R, the vertical distance between the micrometer gauge head 4 and the micrometer zero position at the position of the non-positioned calibrating hemisphere 3 top point is AO 31 =r+h 1 、DO 32 =r+h 2 (ii) a The height difference is h 1 、h 2 The measuring head 4 of the time dial gauge and the sphere center O of the calibration hemisphere 3 2 Is a horizontal distance of
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，
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；
The height difference is h 1 、h 2 The horizontal distance between the measuring heads 4 of the time dial indicator is
Figure DEST_PATH_IMAGE018
Defining the formula as formula (III) or a calculation model (III);
（3）
when the maximum height difference is one h 1 Maximum height difference of two hours 2 All corresponding to opposite sides (different sides) of the vertex, as shown in fig. 9, in this case, the height difference between the calibrated hemisphere 3 and the vertex is h 1 、h 2 The distance between the measuring heads 4 of the dial indicator is O 2 O 31 =R+r、O 2 O 32 = R + R, the vertical distance between the micrometer gauge head 4 and the micrometer zero position at the position of the non-positioned calibrating hemisphere 3 top point is AO 31 =r+h 1 、DO 32 =r+h 2 (ii) a The height difference is h 1 、h 2 The measuring head 4 of the time dial gauge and the sphere center O of the calibration hemisphere 3 2 Is a horizontal distance of
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、
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Then the height difference is respectively h 1 、h 2 The horizontal distance between the measuring heads 4 of the time dial indicator is
Figure DEST_PATH_IMAGE020
This formula is defined as formula (IV) or a computational model (IV); for convenience of being horizontally distanced from the item (3)
Figure DEST_PATH_IMAGE022
To distinguish, in this item
Figure 538111DEST_PATH_IMAGE022
Is defined as AD ', i.e. AD'
Figure DEST_PATH_IMAGE024
。
In one application case, the diameter of the core mold 1 is 3000mm, a calibration hemisphere 3 with a proper size is manufactured according to the size of the core mold 1 so as to be completely attached to the surface of the core mold 1, the radius R of the calibration hemisphere 3 is 2mm, and the radius R of a measuring head 4 of a dial gauge used is 1mm. In the implementation of step 3, the dial indicator advances forward to cross the maximum height difference h of the readings in the calibration hemisphere 3 1 Is 0.12mm; in the implementation of step 4, the maximum height difference measured is two hours 2 Is 0.26mm.
By observing the operator, the readings are h 1 、h 2 The relative position relationship of the time dial indicator is the same side position as shown in figure 8. In this case, the height difference between the calibration hemisphere 3 and the reference hemisphere is h 1 、h 2 The distance between the centers of the measuring heads 4 of the dial gauge is O 2 O 31 =R+r=2+1=3mm、O 2 O 32 = R + R =2+ 1+ 3mm, and the vertical distance between the micrometer gauge head 4 and the zero position of the micrometer gauge at the position not located at the top point of the calibrated hemisphere 3 is AO 31 =r+h 1= 1+0.12=1.12mm、DO 32 =r+h 2 1+0.26=1.26mm; the height difference is respectivelyh 1 、h 2 Measuring head 4 and calibration hemisphere 3 sphere center O of time dial indicator 2 Is a horizontal distance of
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=
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，
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=
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；
The height difference is h 1 、h 2 The horizontal distance between the measuring heads 4 of the time dial indicator is
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=
Figure DEST_PATH_IMAGE030
That is, the linear repeated positioning precision in this test case is 0.0605mm.
Example 2
A method for measuring the linear repeated positioning precision of a filament winding machine comprises the following steps:
step 1, drawing a winding track 2 according to an actual winding path;
specifically, the method comprises the following steps: firstly, setting a winding path program, then fixing a marking pen on a wire outlet nozzle of a winding trolley, running the winding path program, and drawing a winding track 2 on the surface of a core mold 1 by using the marking pen, as shown in figure 1;
when the subsequent winding is carried out, the winding is carried out according to the winding track 2, and each time one layer of winding is finished, the winding is carried out from the starting point to the end point of the winding track 2;
step 2, installing a calibration hemisphere 3 at the center line of the specified position on the winding track 2;
specifically, the method comprises the following steps: selecting a proper calibration hemisphere 3 according to the size of the core mold 1, wherein the radius of the calibration hemisphere 3 is R, fixing (adhering) the calibration hemisphere 3 at a specified position on the winding track 2 as shown in FIG. 2, ensuring that the center of the calibration hemisphere 3 coincides with the center line of the specified position on the winding track 2, and completely attaching the bottom surface of the calibration hemisphere 3 to the surface of the core mold 1;
step 3, fixing the dial indicator with the radius r at the filament outlet of the filament winding machine, operating the filament winding machine to complete single-layer winding for the first time, namely simulating and winding a layer of silk thread along the winding track 2, and acquiring the maximum height difference h of the dial indicator in the process of crossing the calibration hemisphere 3 for the first time 1 ；
Specifically, the method comprises the following steps: firstly, replacing the marking pen with a dial indicator, then adjusting the position of the dial indicator to enable a measuring head 4 of the dial indicator to be positioned at the junction of the edge of the calibration hemisphere 3 and the core mold 1 and to be in contact with the surface of the core mold 1, and then carrying out zero setting operation on the dial indicator; then, the fiber winding machine is operated to complete single-layer winding, and the maximum height difference h of the dial indicator in the process of crossing the calibration hemisphere 3 for the first time is recorded 1 。
And 4, continuously operating the fiber winding machine, winding again, and acquiring the maximum height difference two h of the dial indicator in the process of crossing the calibrated hemisphere 3 for the 2 nd time 2 ；
Step 5, calculating the maximum height difference h 1 Time-corresponding micrometer gauge head 4 sphere center and maximum height difference of two h 2 The horizontal distance S between the spherical centers of the corresponding dial gauge measuring heads 4 is the linear repeated positioning precision;
as shown in FIG. 3, the height differences are h 1 、h 2 The schematic diagram of three different position relationships of the time dial indicator, and the part (a) in fig. 3 shows that the measuring head 4 of the time dial indicator is positioned at the vertex, and h is the moment 1 = R or h 2 = R or h 1 =h 2 The dial gauge measuring head 4 passes through the vertex of the calibration hemisphere 3, and the condition is called as vertex position, (b) part of the dial gauge measuring head 4 is located at the same side of the vertex, and (c) part of the dial gauge measuring head 4 is located at the different side of the vertex; in the measuring process, when the micrometer gauge measuring head 4 moves to the central section of the calibration hemisphere 3 perpendicular to the central line (the central line of the specified position on the winding track 2, namely the central line of the winding track 2 at the installation position of the calibration hemisphere 3)In the plane, the index is h 1 、h 2 When h1, h2 and the vertex are on the same plane;
in this embodiment, the device is further provided with a controller, the controller is connected with an optical fiber amplifier and a visual system (an image acquisition end of the visual system adopts a high-precision camera, a lens of the high-precision camera is right opposite to a dial plate of the dial indicator), the visual system is used for recognizing the reading of the dial indicator, an optical fiber sensor matched with the optical fiber amplifier is arranged on the side of the calibration hemisphere 3, specifically, the optical fiber sensor is arranged at the cross section position in fig. 2, and the sensing light rays emitted by the optical fiber sensor (indicated by the marks (1) and (2) in fig. 10-12) just act on the rod body of the dial indicator when a measuring head 4 of the dial indicator moves to a plane where the central section of the calibration hemisphere 3 is perpendicular to a central line (the central line of the specified position on the winding track 2, namely the central line of the mounting position of the calibration hemisphere 3) and are located, and more exactly the sensing light rays act on the axial line of the rod body of the dial indicator; the controller comprises a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the following steps/functions when executing the program:
s1, when a micrometer gauge head 4 moves to a plane where a central section of a calibration hemisphere 3 perpendicular to a central line is located, an optical fiber sensor senses a micrometer gauge rod body, namely sensing light emitted by the optical fiber sensor is just incident on the micrometer gauge rod body, and sensing signals are fed back to a controller through an optical fiber amplifier;
s2, at the moment that the controller receives the induction signal, reading of the dial indicator is obtained through a vision system;
s3, judging the relative position of the rod body of the dial indicator according to the obtained sensing signal;
defining a horizontal distance corresponding to an induction signal obtained when a measuring head 4 of the dial indicator is just positioned at the top point of the calibration hemisphere 3 as a preset threshold value (represented by a symbol P), wherein the distance between the optical fiber sensor and a rod body of the dial indicator is a constant value L at the moment, namely, the distance value L between the optical fiber sensor and the rod body of the dial indicator in the state is defined as the preset threshold value;
(1) When the optical fiber amplifier is arranged on the right side of the calibration hemisphere 3, if the horizontal distance corresponding to the obtained sensing signal is larger than a preset threshold value, the dial gauge rod body is positioned on the left side of the top point of the calibration hemisphere 3, and if the horizontal distance corresponding to the obtained sensing signal is smaller than the preset threshold value, the dial gauge rod body is positioned on the right side of the top point of the calibration hemisphere 3;
more specifically, the present invention is to provide a novel,
taking the part (a) of fig. 11 as an example, the dial indicator counts the maximum height difference of one h during the first crossing of the calibration hemisphere 3 1 When the dial indicator is used, sensing light (1) emitted by the optical fiber sensor just acts on the rod body of the dial indicator, the optical fiber sensor senses a signal A and feeds the signal A back to the controller through the optical fiber amplifier, and the horizontal distance corresponding to the signal A is represented by P1; the dial gauge indicates the maximum height difference of two h in the process of crossing the calibration hemisphere 3 for the second time 2 When the dial indicator is used, sensing light (2) emitted by the optical fiber sensor just acts on the dial indicator rod body, the optical fiber sensor senses a signal B and feeds the signal B back to the controller through the optical fiber amplifier, and data corresponding to the signal B are represented by P2; due to the optical fiber sensor and h 1 The distance L1 between the rod bodies of the time dial indicator is greater than the distance h between the optical fiber sensor and the rod body 2 The distance L2 between the rod bodies of the dial indicator is longer than L, and L1 and L2 are both larger than L, so that P1 is larger than P2 and larger than P, the corresponding rod body of the dial indicator is positioned on the left side of the top point of the calibration hemisphere 3, and the maximum height difference is one hour 1 Maximum height difference of two h 2 All correspond to the same side (left side) of the vertex; similarly, taking the part (b) of fig. 11 as an example, it can be considered that P < P1 < P2, the corresponding dial indicator rod body is located at the left side of the vertex of the calibration hemisphere 3, and the maximum height difference is one h 1 Maximum height difference of two h 2 All corresponding to the same side of the vertex (left side); in both cases, the calculation model equation (iii) may be called in step S4;
wherein, P1, P2 represent the language read by the computer/controller, L1, L2 represent the horizontal distance value, P corresponds to L, P1 corresponds to L1, P2 corresponds to L2;
taking the part (a) of fig. 12 as an example, the dial indicator counts the maximum height difference of one h during the first crossing of the calibration hemisphere 3 1 When the optical fiber sensor is used, the sensing light (1) emitted by the optical fiber sensor is justActing on a dial indicator rod body, sensing a signal A by the optical fiber sensor at the moment and feeding back to the controller through the optical fiber amplifier, wherein the horizontal distance corresponding to the signal A is represented by P1; the dial gauge indicates the maximum height difference of two h in the process of crossing the calibration hemisphere 3 for the second time 2 When the dial indicator is used, sensing light (2) emitted by the optical fiber sensor just acts on the rod body of the dial indicator, the optical fiber sensor senses a signal B and feeds the signal B back to the controller through the optical fiber amplifier, and data corresponding to the signal B are represented by P2; due to the optical fiber sensor and h 1 The distance L1 between the rod bodies of the time dial indicator is greater than the distance h between the optical fiber sensor and the rod body 2 The distance L2 between the rod bodies of the dial indicator, L1 is greater than L, and L2 is less than L, so that P1 is greater than P and greater than P2, and the corresponding maximum height difference is h 1 The rod body of the time dial indicator is positioned on the left side of the top point of the calibration hemisphere 3, and the maximum height difference is two hours 2 The rod body of the time dial indicator is positioned at the right side of the top point of the calibration hemisphere 3, namely the maximum height difference is one hour 1 Maximum height difference of two hours 2 All corresponding to opposite sides (different sides) of the vertex; similarly, for example, in FIG. 12 (b), P1 < P2 is considered to correspond to a maximum height difference of one h 1 The rod body of the time dial indicator is positioned at the right side of the top point of the calibration hemisphere 3, and the maximum height difference is two hours 2 The rod body of the time dial indicator is positioned on the left side of the top point of the calibration hemisphere 3, namely, the maximum height difference is h 1 Maximum height difference of two h 2 Both correspond to different sides (different sides) of the vertex, and in both cases, the calculation model formula (iv) may be called in step S4;
similarly, in the state shown in fig. 11, the relative position of the rod body of the dial indicator can be determined according to the obtained sensing signal;
alternatively, the first and second liquid crystal display panels may be,
(2) Referring to the judgment principle of the part (1) in the step, when the optical fiber amplifier is installed on the left side of the calibration hemisphere 3, if the horizontal distance corresponding to the obtained sensing signal is greater than the preset threshold value, the rod body of the dial gauge is positioned on the right side of the top point of the calibration hemisphere 3, and if the horizontal distance corresponding to the obtained sensing signal is smaller than the preset threshold value, the rod body of the dial gauge is positioned on the left side of the top point of the calibration hemisphere 3;
and S4, calling a corresponding calculation model according to the obtained reading and the relative position, and calculating and outputting the linear repeated positioning precision.
Compared with the embodiment 1, the scheme in the embodiment has the advantages that the optical fiber sensor and the vision system play a role in facilitating the measurement of linear repeated positioning precision more quickly, accurately and simply, the measurement of the linear repeated positioning precision can be completed in less than ten minutes (except for the time for programming winding path programs), the operation procedures of operators are greatly reduced, the relative position of the rod body of the dial gauge is judged by means of the optical fiber sensor, and the maximum height difference is obtained/acquired by means of the vision system by one hour 1 Maximum height difference of two hours 2 And the control system calls the calculation model to obtain the linear repeated positioning accuracy value, so that the linear repeated positioning and the accuracy measurement are realized more quickly, accurately and simply, and the measurement error can reach the micron level.
According to the invention, the linear repeated positioning precision is measured by means of the calibration hemisphere and the dial indicator, the nondestructive measurement is adopted, the defects of large measurement error, low measurement efficiency and the like of the existing manual marking inspection method can be effectively avoided, and the measurement precision of the linear repeated positioning precision can be greatly improved; the used calibration hemisphere is used as a measuring reference, the size of the calibration hemisphere can be flexibly changed according to the size of the core mold, and the measuring position can be flexibly set, so that the application range of the invention is expanded; the method can accurately, quickly and simply realize the measurement of the linear repeated positioning precision, has simple operation process and easy implementation, and can be smoothly operated by common operators; the method can be applied to the processes of fiber filament laying, fiber tape laying, 3D printing and the like to measure the linear repeated positioning accuracy.

Claims (10)

1. A linear repositioning accuracy measurement method for a filament winding machine, comprising the steps of:
step 1, drawing a winding track according to an actual winding path;
step 2, installing a calibration hemisphere at the center line of the specified position on the winding track;
step 3, fixing the dial indicator with the radius r at the filament outlet of the fiber winding machine, operating the fiber winding machine to complete single-layer winding, and acquiring the maximum height of the dial indicator in the process of crossing the calibrated hemisphere for the first timeDifference of one h 1 ；
And 4, continuously operating the fiber winding machine, winding for a plurality of times again or continuously, and acquiring the maximum height difference two h of the indication of the dial indicator in the process of crossing the calibrated hemisphere for the Nth time 2 ；
Step 5, calculating the maximum height difference h 1 Time-corresponding micrometer gauge measuring head sphere center and maximum height difference of two hours 2 And the horizontal distance S between the corresponding micrometer gauge measuring head ball centers is the linear repeated positioning precision.
2. The method according to claim 1, wherein said step 1 specifically comprises: firstly, setting a winding path program, then fixing a marking pen on a wire outlet nozzle of a winding trolley, then running the winding path program, and drawing a winding track on the surface of a core mold by using the marking pen.
3. The method according to claim 1, wherein the step 2 specifically comprises: and selecting a proper calibration hemisphere with the radius of R, fixing the calibration hemisphere at a specified position on the winding track, and ensuring that the center of the calibration hemisphere is coincident with the center line of the specified position on the winding track.
4. The method according to claim 1, wherein the step 3 specifically comprises: replacing the marking pen with a dial indicator, adjusting the position of the dial indicator to enable a measuring head of the dial indicator to be positioned at the junction of the edge of the calibrated hemisphere and the core mold and to be in contact with the surface of the core mold, and then carrying out zero setting operation on the dial indicator; then operating a fiber winding machine to complete single-layer winding, and recording the maximum height difference h of the dial indicator in the process of crossing the calibrated hemisphere for the first time 1 。
5. The method of claim 4, wherein: in the step 4, winding is continuously carried out for 3-5 times, and the average value or the maximum value of the maximum height difference of the readings is taken as the maximum height difference for two hours 2 。
6. The method of claim 1, wherein: and fixing the calibration hemisphere at the center line of the specified position on the winding track by adopting a bonding or threaded connection mode.
7. The method of claim 1, wherein: the radius of the calibrated hemisphere is not more than 10mm.
8. The method according to any one of claims 3-7, wherein:
when the maximum height difference is one h 1 Corresponding to the vertex and having a height difference of two h with respect to the maximum height 2 On the inner side or the outer side, linear repeated positioning accuracy D0 is obtained by adopting formula (I) to calculate 2 ；
Figure FDA0003954298080000011
When the maximum height difference is two h 2 Corresponding to the vertex and having a height difference of h with respect to the maximum 1 On the inner side or the outer side, linear repeated positioning accuracy A0 is obtained by adopting formula (II) calculation 2 ；
Figure FDA0003954298080000012
When the maximum height difference is one h 1 Maximum height difference of two hours 2 Calculating by adopting a formula (III) to obtain linear repeated positioning precision AD corresponding to the same side of the vertex;
Figure FDA0003954298080000021
when the maximum height difference is one h 1 Maximum height difference of two h 2 Corresponding to two sides/different sides (different sides) of the vertex, and calculating by adopting a formula (IV) to obtain linear repeated positioning precision AD';
Figure FDA0003954298080000022
in the formula, R represents the radius of a calibration hemisphere, and R represents the radius of a measuring head of a dial indicator.
9. The method according to claim 8, characterized by further comprising a controller, wherein the controller is connected with an optical fiber amplifier and a vision system, the vision system is used for recognizing the reading of the dial indicator, an optical fiber sensor matched with the optical fiber amplifier is installed on the side of the calibration hemisphere, and when a measuring head of the dial indicator moves to the plane where the central section of the calibration hemisphere perpendicular to the central line is located, sensing light rays emitted by the optical fiber sensor just act on a rod body of the dial indicator; the controller comprises a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the following steps/functions when executing the program:
s1, when a measuring head of the dial indicator moves to a plane where a central section of a calibration hemisphere perpendicular to the central line is located, sensing a rod body of the dial indicator by an optical fiber sensor, and feeding back a sensing signal to a controller through an optical fiber amplifier;
s2, acquiring the reading of the dial indicator through a visual system at the moment when the controller receives the sensing signal;
s3, judging the relative position of the rod body of the dial indicator according to the obtained induction signal;
and S4, calling a corresponding calculation model according to the obtained reading and the relative position, and calculating and outputting the linear repeated positioning precision.
10. The method according to claim 9, characterized in that in step S3:
defining a horizontal distance corresponding to an induction signal obtained when a calibration hemisphere measuring head is positioned at the vertex of a calibration hemisphere as a preset threshold value;
(1) When the optical fiber amplifier is arranged on the right side of the calibration hemisphere, if the horizontal distance corresponding to the obtained sensing signal is larger than a preset threshold value, the dial gauge rod body is positioned on the left side of the vertex of the calibration hemisphere, and if the horizontal distance corresponding to the obtained sensing signal is smaller than the preset threshold value, the dial gauge rod body is positioned on the right side of the vertex of the calibration hemisphere;
alternatively, the first and second electrodes may be,
(2) When the optical fiber amplifier is installed on the left side of the calibration hemisphere, if the horizontal distance corresponding to the obtained sensing signal is larger than the preset threshold value, the dial gauge rod body is located on the right side of the vertex of the calibration hemisphere, and if the horizontal distance corresponding to the obtained sensing signal is smaller than the preset threshold value, the dial gauge rod body is located on the left side of the vertex of the calibration hemisphere.
CN202211459448.0A 2022-11-21 2022-11-21 Linear repeated positioning precision measuring method for fiber winding machine Pending CN115782144A (en)

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