CN116399216A - Workpiece surface thickness measuring method - Google Patents
Workpiece surface thickness measuring method Download PDFInfo
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- CN116399216A CN116399216A CN202310441708.XA CN202310441708A CN116399216A CN 116399216 A CN116399216 A CN 116399216A CN 202310441708 A CN202310441708 A CN 202310441708A CN 116399216 A CN116399216 A CN 116399216A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000523 sample Substances 0.000 claims abstract description 68
- 238000003754 machining Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 description 39
- 238000010586 diagram Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0608—Height gauges
Abstract
The invention discloses a workpiece surface thickness measuring method, which specifically comprises the following steps: step 1: selecting a point to be measured according to a three-dimensional model of a workpiece to be measured, and referring to a lathe machining origin of the workpiece to generate shaft positioning data of gantry equipment; step 2: after the shaft positioning data are completed, a thickness measuring task list is formed at the remote end of the database, and the workpiece to be measured is sent to the gantry equipment when the workpiece to be measured is sent to the gantry equipment; step 3: the gantry equipment X, Y shaft moves to the highest position of the surface of the measured workpiece after being calibrated according to the point position data of the measured point, and long laser with the measuring range of 1-5m is used for measuring the height of the surface of the measured workpiece from the thickness measuring probe, so that the thickness measuring probe and the workpiece have enough safety height in descending, and collision is avoided; step 4: the side probe is then lowered along the Z-axis to the working height of the line laser scanner. The invention can solve the technical problem that the workpiece with complex surface characteristics is inconvenient to detect the thickness in the prior art.
Description
Technical Field
The invention relates to the technical field of thickness measuring equipment, in particular to a workpiece surface thickness measuring method.
Background
In practical use, in order to clearly understand parameters of a workpiece, the thickness of the workpiece needs to be measured, and meanwhile, in order to monitor errors of the processed workpiece, contour information of the workpiece needs to be obtained, namely, the contour of the workpiece is automatically modeled through software after being scanned by a scanner, so that acquisition of two-dimensional data and three-dimensional data is realized, and the contour data of the workpiece obtained through scanning is compared with theoretical modeling data, so that whether the prepared workpiece meets requirements or not is analyzed better.
However, in practical use, because the surface characteristics of the workpiece are complex, when the thickness of the workpiece is measured, the workpiece is mostly needed to be measured by manpower, so that the detection efficiency is low, and meanwhile, the thickness measuring probe is easy to contact with the surface of the workpiece in the detection process, so that damage is caused, and the quality of the workpiece is reduced.
Disclosure of Invention
The invention aims to provide a workpiece surface thickness measuring method which can solve the technical problem that in the prior art, a workpiece with complex surface characteristics is inconvenient to detect thickness.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for measuring thickness of a workpiece surface specifically comprises the following steps:
step 1: selecting a point to be measured according to a three-dimensional model of a workpiece to be measured, and referring to a lathe machining origin of the workpiece to generate shaft positioning data of gantry equipment;
step 2: after the shaft positioning data are completed, a thickness measuring task list is formed at the remote end of the database, and the workpiece to be measured is sent to the gantry equipment when the workpiece to be measured is sent to the gantry equipment;
step 3: the gantry equipment X, Y shaft moves to the highest position of the surface of the measured workpiece after being calibrated according to the point position data of the measured point, and long laser with the measuring range of 1-5m is used for measuring the height of the surface of the measured workpiece from the thickness measuring probe, so that the thickness measuring probe and the workpiece have enough safety height in descending, and collision is avoided;
step 4: then the side detection is lowered to the working height of the line laser scanner along the Z axis, the line laser scanner is used for three-dimensional scanning, and the coordinate positions of the workpiece surface in X, Y and Z space of the gantry equipment are obtained through calculation of point position information obtained after scanning;
determining the descending position of the thickness measuring probe by the Z-axis height in the positioning data, and obtaining the surface characteristic information of the area block by obtaining the coordinate position information of the point position in the three-dimensional space data, so as to obtain whether the thickness measuring probe descends to a preset position, the slope of the workpiece surface and the concave-convex condition of the workpiece surface in a local range accurately, and ensuring the position of a measurement center point in the safe descending of the thickness measuring probe;
step 5: the measurement is performed by a thickness probe 1-2mm from the surface of the workpiece.
Wherein the thickness measuring probe is a non-contact electromagnetic probe.
Further optimizing, the gantry device has the positioning function of X, Y and Z axis, the gantry measuring system coordinates of the gantry device have three normal ijk parameters corresponding to space X, Y and Z and three normal ijk corresponding to measuring points of the workpiece,
positive direction of X: i=1; negative X direction i= -1; y positive direction j=1, y negative direction j= -1, z positive direction k=1, z negative direction k= -1 for correlating the measuring point defining direction with the direction of each movement axis of the gantry device.
In step 4, the method for obtaining the surface characteristic information is as follows: the method comprises the steps of measuring positioning data of a point position through a three-dimensional model of a workpiece, adjusting the optimal scanning distance of a line laser scanner on the surface of the workpiece to be 500mm, scanning the space geometric dimension of the position of the measured point position through the line laser scanner, judging surface characteristic information in the area according to the measuring data, and calculating to obtain the measuring position of a thickness measuring probe.
The method comprises the steps of extracting positioning data of a measurement point position of a three-dimensional model obtained through measurement, superposing the extracted effective data into a three-dimensional coordinate system X, Y and a Z coordinate variable of gantry equipment, calculating to obtain a normal line position coordinate of a thickness measurement probe, adjusting an angle of the thickness measurement probe according to the coordinate so as to enable an axis of the thickness measurement probe to coincide with the normal line, controlling the contact distance at a position of 1-2mm required by the thickness measurement probe, and enabling the contact distance to be perpendicular to the surface of a test point of a workpiece.
Further optimizing, the shaft of the gantry equipment is provided with a long-distance laser ranging module, and the function is to measure the height of a sheet metal test point at the highest point of the Z shaft; the highest Z axis is: 0 stroke origin or safe height; because of the flexibility and unpredictability of the measurement parts, it is desirable to dynamically measure the sheet metal vertical height of the spot in real time without prior establishment of a measurement model, thereby providing an optimal reference distance for the line laser scanner to operate.
Compared with the prior art, the invention has the following beneficial effects:
the invention mainly drives the line laser scanner and the thickness measuring probe to measure the thickness of the workpiece by means of the gantry equipment, selects a point to be measured for a three-dimensional model of the workpiece to be measured, then automatically generates the thickness measuring sheet, moves the workpiece to be detected to the gantry equipment, scans the outline of the workpiece by the arranged line laser scanner, simultaneously generates outline information of the workpiece, obtains the space coordinate position information of the surface of the workpiece in the gantry equipment after calculating the outline information, controls the descending position of the thickness measuring probe according to the Z-axis height in the space coordinate position information, and realizes the thickness detection of different points by adjusting the Z-axis height in the corresponding coordinate position at any time through the space coordinate position information, thereby ensuring that the thickness measuring probe can measure with the surface of the workpiece at a fixed interval, effectively improving the efficiency of the thickness detection of the workpiece, simultaneously realizing the distance detection, protecting the workpiece well and preventing the workpiece from damage.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic diagram of the overall structure of a measuring device according to a second embodiment of the present invention.
Fig. 3 is a front view of fig. 2 of the present invention.
FIG. 4 is a schematic diagram showing the connection relationship between the measuring assembly and the third driving mechanism.
FIG. 5 is a schematic diagram of the structure of the measuring assembly of the present invention.
Fig. 6 is a schematic diagram of the overall structure of the buffering mechanism of the present invention.
Reference numerals:
101-portal frame, 102-first actuating mechanism, 103-second actuating mechanism, 104-third actuating mechanism, 105-measuring component, 106-thickness measuring probe, 107-line laser scanner, 108-mounting plate, 109-rotating platform, 110-connecting seat, 111-rotating motor, 112-mounting bracket, 113-fixing bracket, 114-first support, 115-second support, 116-waist type groove, 117-buffer mechanism, 118-pressure sensor, 119-step hole structure, 120-connecting rod, 121-upper press seat, 122-spring, 123-lower press seat, 124-mounting cylinder, 125-connecting piece, 26-abdication groove, 127-through hole, 128-protective housing.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in numerous different ways without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the embodiments of the present invention, it should be understood that the terms "length," "vertical," "horizontal," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the embodiments of the present invention and to simplify the description, rather than to indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
In the embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
In embodiments of the invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
The following disclosure provides many different implementations, or examples, for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The embodiment discloses a workpiece surface thickness measuring method, which specifically comprises the following steps:
step 1: selecting a point to be measured according to a three-dimensional model of a workpiece to be measured, and referring to a lathe machining origin of the workpiece to generate shaft positioning data of gantry equipment;
step 2: after the shaft positioning data are completed, a thickness measuring task list is formed at the remote end of the database, and the workpiece to be measured is sent to the gantry equipment when the workpiece to be measured is sent to the gantry equipment;
step 3: the gantry equipment X, Y shaft moves to the highest position of the surface of the measured workpiece after being calibrated according to the point position data of the measured point, and long laser with the measuring range of 1-5m is used for measuring the height of the surface of the measured workpiece from the thickness measuring probe, so that the thickness measuring probe and the workpiece have enough safety height in descending, and collision is avoided;
step 4: then the side detection is lowered to the working height of the line laser scanner along the Z axis, the line laser scanner is used for three-dimensional scanning, and the coordinate positions of the workpiece surface in X, Y and Z space of the gantry equipment are obtained through calculation of point position information obtained after scanning;
determining the descending position of the thickness measuring probe by the Z-axis height in the positioning data, and obtaining the surface characteristic information of the area block by obtaining the coordinate position information of the point position in the three-dimensional space data, so as to obtain whether the thickness measuring probe descends to a preset position, the slope of the workpiece surface and the concave-convex condition of the workpiece surface in a local range accurately, and ensuring the position of a measurement center point in the safe descending of the thickness measuring probe;
step 5: the measurement is performed by a thickness probe 1-2mm from the surface of the workpiece.
The invention mainly drives the line laser scanner and the thickness measuring probe to measure the thickness of the workpiece by means of the gantry equipment, selects a point to be measured for a three-dimensional model of the workpiece to be measured, then automatically generates the thickness measuring sheet, moves the workpiece to be detected to the gantry equipment, scans the outline of the workpiece by the arranged line laser scanner, simultaneously generates outline information of the workpiece, obtains the space coordinate position information of the surface of the workpiece in the gantry equipment after calculating the outline information, controls the descending position of the thickness measuring probe according to the Z-axis height in the space coordinate position information, and realizes the thickness detection of different points by adjusting the Z-axis height in the corresponding coordinate position at any time through the space coordinate position information, thereby ensuring that the thickness measuring probe can measure with the surface of the workpiece at a fixed interval, effectively improving the efficiency of the thickness detection of the workpiece, simultaneously realizing the distance detection, protecting the workpiece well and preventing the workpiece from damage.
In this embodiment, the thickness measuring probe is a non-contact electromagnetic probe.
Wherein, the gantry device has the positioning function of X, Y and Z axis, the gantry measuring system coordinates of the gantry device have three normal ijk parameters corresponding to space X, Y and Z and three normal ijk corresponding to measuring points of the workpiece,
positive direction of X: i=1; negative X direction i= -1; y positive direction j=1, y negative direction j= -1, z positive direction k=1, z negative direction k= -1 for correlating the measuring point defining direction with the direction of each movement axis of the gantry device.
Further defined, in step 4, the method for obtaining the surface feature information is as follows: the method comprises the steps of measuring positioning data of a point position through a three-dimensional model of a workpiece, adjusting the optimal scanning distance of a line laser scanner on the surface of the workpiece to be 500mm, scanning the space geometric dimension of the position of the measured point position through the line laser scanner, judging surface characteristic information in the area according to the measuring data, and calculating to obtain the measuring position of a thickness measuring probe.
The method comprises the steps of extracting positioning data of a measurement point position of a three-dimensional model obtained through measurement, superposing the extracted effective data into a three-dimensional coordinate system X, Y and a Z coordinate variable of gantry equipment, calculating to obtain a normal line position coordinate of a thickness measurement probe, adjusting an angle of the thickness measurement probe according to the coordinate so as to enable an axis of the thickness measurement probe to coincide with the normal line, controlling the contact distance at a position of 1-2mm required by the thickness measurement probe, and enabling the contact distance to be perpendicular to the surface of a test point of a workpiece.
The shaft of the gantry equipment is provided with a long-distance laser ranging module which is used for measuring the height of a sheet metal test point at the highest point of the Z shaft; the highest Z axis is: 0 stroke origin or safe height; because of the flexibility and unpredictability of the measurement parts, it is desirable to dynamically measure the sheet metal vertical height of the spot in real time without prior establishment of a measurement model, thereby providing an optimal reference distance for the line laser scanner to operate.
Example two
The embodiment discloses a measuring device, by which the detection of the thickness of a workpiece is realized, wherein the measuring device in the embodiment is the gantry device in the first embodiment; the concrete structure is as follows:
the device comprises a portal frame 101, a first driving mechanism 102, a second driving mechanism 103 and a third driving mechanism 104, wherein the first driving mechanism 102 is installed on the portal frame 101, the second driving mechanism 103 is arranged on the first driving mechanism 102, the third driving mechanism 104 is arranged on the second driving mechanism 103, and a measuring assembly 105 is arranged on the third driving mechanism 104;
in actual use, the first driving mechanism 102 drives the second driving mechanism 103 to move along the X-axis direction, and the second driving mechanism 103 drives the third driving mechanism 104 to move along the Y-axis direction; the third driving mechanism 104 drives the measuring assembly 105 to move in the Z-axis direction.
The measuring assembly 105 comprises a thickness measuring probe 106 and a line laser scanner 107, wherein the thickness measuring probe 106 is used for detecting the thickness of a workpiece, and the line laser scanner 107 is used for scanning the outline of the workpiece;
the measuring assembly 105 further comprises a mounting plate 108, a rotating platform 109 and a connecting seat 110, wherein the mounting plate 108 is connected with the third driving mechanism 104, the rotating platform 109 is arranged below the mounting plate 108, the connecting seat 110 is of an L-shaped structure, one end of the connecting seat 110 is connected with the rotating platform 109, the other end of the connecting seat 110 is connected with a rotating motor 111, the line laser scanner 107 is arranged at the rotating end of the rotating motor 111, and the thickness measuring probe 106 is arranged on the shell of the rotating motor 111; the rotation stage 109 is configured to drive a rotation motor 111 to rotate about the Z axis, and the rotation motor 111 is configured to drive the line laser scanner 107 to rotate for angular adjustment.
The thickness measuring probe 106 and the line laser scanner 107 are arranged on one portal frame 101, and the movement in the X, Y and Z-axis directions is realized through the first driving mechanism, the second driving mechanism and the third driving mechanism, so that the thickness measuring probe 106 and the line laser scanner 107 can be ensured to approach and realize the detection of a workpiece; in actual use, the first driving mechanism 102 drives the second driving mechanism 103 to move in the X direction, the second driving mechanism 103 drives the third driving mechanism 104 to move in the Y direction, and the third driving mechanism 104 drives the thickness measuring probe 106 and the line laser scanner 107 to move in the Z direction, so that the position of the measuring component 105 is adjusted;
in practical use, the collection of the transverse and longitudinal data of the workpiece is realized through the rotating platform 109 and the rotating motor 111, and because the rotating platform 109 is used for driving the rotating motor 111 to rotate around the Z axis, the line laser scanner 107 rotates around the Z axis when the workpiece data is collected, so that the collection of the transverse data of the workpiece is realized, and when the rotating motor 111 drives the line laser scanner to rotate, the collection of the lateral data of the workpiece, namely the collection of the longitudinal data is realized. Meanwhile, the thickness measuring probe 106 can be used for accurately detecting the thickness of the material according to different materials; the line laser scanner 107 can collect and detect two-dimensional and three-dimensional data of the workpiece in real time, and realize integrated collection of thickness and contour data of the workpiece. Meanwhile, the thickness measuring probe 106 and the line laser scanner 107 are arranged on the portal frame 101, so that ground wiring is avoided, and the field cleanliness is ensured.
In actual use, the mounting plate 108 is provided with a protective case for covering the rotary table 109.
In practical use, the first drive mechanism 102, the second drive mechanism 103, and the third drive mechanism 104 mainly realize driving of the measurement assembly 105 in the X, Y and Z directions.
Wherein the line laser scanner is mounted on the rotation motor 111 by a mounting bracket 112, the mounting bracket 112 comprises a fixing bracket 113, a first bracket 114 and a second bracket 115,
the fixed frame 113 is installed on the rotating end of the rotating motor 111, the first bracket 114 is installed on the fixed frame 113, the line laser scanner is fixedly installed on the second bracket 115, a threaded hole is formed in the first bracket 114, a waist-shaped groove 116 is formed in the position, corresponding to the threaded hole, of the second bracket 115, and the first bracket 114 and the second bracket 115 are fixedly connected through screws of the waist-shaped groove 116.
In actual use, the first bracket 114 and the second bracket 115 are connected through the waist-shaped groove 116 and the screw, so that the adjustment is convenient in the assembly process;
in this embodiment, the thickness measuring probe 106 is mounted on the casing of the rotary motor 111 through the buffer mechanism 117, the buffer mechanism 117 includes a fixed rod, a pressure sensor 118, a connecting rod 120 having a stepped hole structure 119 therein and connected with the casing of the rotary motor 111 through the fixed rod, an upper pressing seat 121, a spring 122 and a lower pressing seat 123 sequentially disposed in the stepped hole structure 119 of the connecting rod 120 from top to bottom, and a mounting cylinder 124 for mounting the thickness measuring probe 106, a connecting piece 125 is movably disposed in the stepped hole structure 119 below the lower pressing seat 123, the connecting piece 125 has a T-shaped structure, and a step surface on the connecting piece 125 and a step surface of the stepped hole structure 119 form a limiting structure;
the upper end of the mounting cylinder 124 is in sliding fit with the stepped hole structure 119 and fixedly connected with the connecting piece 125, the pressure sensor 118 is positioned in the stepped hole structure 119 and is contacted with the upper pressing seat 121, and after the connecting rod 120 is connected with the fixed rod, the pressure sensor 118 is contacted with the end part of the fixed rod and the spring 122 is in a compressed state; the side of the connecting rod 120 is provided with a relief groove 126 for the harness of the pressure sensor 118 to pass through, and the pressure sensor 118 is connected with the third driving mechanism through a controller.
The thickness measuring probe 106 is arranged on the mounting cylinder 124 by forming a buffer structure through the spring 122, the upper pressing seat 121 and the lower pressing seat 123; under the action of the spring 122, the upper end of the upper pressing seat 121 is contacted with the pressure sensor 118, when the thickness measuring probe is contacted with the surface of a workpiece, soft contact is formed under the action of the spring 122, at the moment, the thickness measuring probe, the connecting seat 110 and the lower pressing seat 123 are moved upwards, the spring 122 is compressed, at the moment, the pressure value of the pressure sensor 118 is changed, and at the moment, the controller can control the third driving mechanism to stop moving; the aim of collision prevention and sudden stop is fulfilled; therefore, the technical problems that the thickness measuring probe 106 is damaged and the measured workpiece is scrapped due to the fact that the thickness measuring probe is easy to collide with the workpiece when the workpiece is measured in the prior art can be effectively solved, and the measuring safety is improved.
Wherein the fixing rod is screwed with the connecting rod 120.
Further optimizing, the upper pressing seat 121 and the lower pressing seat 123 are of T-shaped structures, and the small ends of the upper pressing seat 123 and the lower pressing seat 123 extend into the spring 122; making the spring 122 more stable when compressed; the mounting cylinder 124 is threadably coupled to the connector 110.
Further preferably, in some specific embodiments, the pressure sensor 118 is a ring-type pressure sensor, and through holes 127 are formed in the fixing rod, the upper pressing seat 121, the lower pressing seat 123 and the connecting piece, and the through holes 127 are used for allowing a wire harness of the thickness measuring probe to pass through, so that the wire harness of the thickness measuring probe is conveniently routed.
Further preferably, the outer side wall of the fixing rod is provided with a limiting part for limiting the end part of the connecting rod 120, so that the limiting purpose can be achieved in actual use.
In this way, in actual use, the first driving mechanism 102, the second driving mechanism 103, and the third driving mechanism 104 are provided to enable movement in the space X, Y and the Z-axis direction; meanwhile, the motor 111 can also rotate around the Z axis under the action of the rotating platform 109, and at the moment, the line laser scanner 107 rotates around the Z axis when workpiece data acquisition is performed, so that workpiece multi-angle data acquisition is realized
According to the invention, positioning data determined by contour scanning is carried out on a three-dimensional model of a workpiece, the optimal scanning distance of a line laser scanner on the surface of the workpiece is adjusted to be 500mm, the line laser scanner scans the space coordinates of a measured point on the workpiece, namely, whether the surface features of the surface of the workpiece have the convex and concave features or not can be obtained through calculation, the surface conditions of the workpiece are fed back, and the detection position of the thickness measuring probe is determined after the value is added to the space coordinates of the measured point after Z.
In this embodiment, only two data are needed to be detected, one is that the workpiece contour is scanned to form a spatial coordinate position of the point location information, and the other is that the Z-axis height value is calculated according to the spatial coordinate position of the point location information, so that a new spatial coordinate of the point location information is formed after a Z-axis value is added to the spatial coordinate position of the point location information; when the thickness measurement is carried out, effective data can be selected according to the requirement, and the effective data is the data information of the key point positions for fixed-point thickness measurement.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The workpiece surface thickness measuring method is characterized by comprising the following steps of:
step 1: selecting a point to be measured according to a three-dimensional model of a workpiece to be measured, and referring to a lathe machining origin of the workpiece to generate shaft positioning data of gantry equipment;
step 2: after the shaft positioning data are completed, a thickness measuring task list is formed at the remote end of the database, and the workpiece to be measured is sent to the gantry equipment when the workpiece to be measured is sent to the gantry equipment;
step 3: the gantry equipment X, Y shaft moves to the highest position of the surface of the measured workpiece after being calibrated according to the point position data of the measured point, and long laser with the measuring range of 1-5m is used for measuring the height of the surface of the measured workpiece from the thickness measuring probe, so that the thickness measuring probe and the workpiece have enough safety height in descending, and collision is avoided;
step 4: then the side detection is lowered to the working height of the line laser scanner along the Z axis, the line laser scanner is used for three-dimensional scanning, and the coordinate positions of the workpiece surface in X, Y and Z space of the gantry equipment are obtained through calculation of point position information obtained after scanning;
determining the descending position of the thickness measuring probe by the Z-axis height in the positioning data, and obtaining the surface characteristic information of the area block by obtaining the coordinate position information of the point position in the three-dimensional space data, so as to obtain whether the thickness measuring probe descends to a preset position, the slope of the workpiece surface and the concave-convex condition of the workpiece surface in a local range accurately, and ensuring the position of a measurement center point in the safe descending of the thickness measuring probe;
step 5: the measurement is performed by a thickness probe 1-2mm from the surface of the workpiece.
2. A method of workpiece surface thickness measurement according to claim 1, wherein: the thickness measuring probe is a non-contact electromagnetic probe.
3. A method of workpiece surface thickness measurement according to claim 1, wherein: the gantry device has the positioning function of X, Y and Z axis, the coordinates of the gantry measuring system of the gantry device have space X, Y and Z correspond to three normal ijk parameters, correspond to three normal ijk of the measuring point of the workpiece,
positive direction of X: i=1; negative X direction i= -1; y positive direction j=1, y negative direction j= -1, z positive direction k=1, z negative direction k= -1 for correlating the measuring point defining direction with the direction of each movement axis of the gantry device.
4. A method of workpiece surface thickness measurement according to claim 1, wherein: in step 4, the method for obtaining the surface characteristic information is as follows: the method comprises the steps of measuring positioning data of a point position through a three-dimensional model of a workpiece, adjusting the optimal scanning distance of a line laser scanner on the surface of the workpiece to be 500mm, scanning the space geometric dimension of the position of the measured point position through the line laser scanner, judging surface characteristic information in the area according to the measuring data, and calculating to obtain the measuring position of a thickness measuring probe.
5. The method for measuring thickness of a surface of a workpiece according to claim 4, wherein: extracting the positioning data of the measured point position of the three-dimensional model, adding the extracted effective data into a three-dimensional coordinate system X, Y and a Z coordinate variable of gantry equipment, calculating to obtain a normal line position coordinate of the measured thickness, and adjusting the angle of the thickness measuring probe according to the coordinate so as to enable the axis of the thickness measuring probe to coincide with the normal line, wherein the thickness measuring probe is R=32 mm, the contact distance is controlled at the position of 1-2mm required by the thickness measuring probe, and the contact distance is perpendicular to the surface of a test point of a workpiece.
6. A method of measuring thickness of a surface of a workpiece according to any of claims 1-5, wherein: the shaft of the gantry equipment is provided with a long-distance laser ranging module which is used for measuring the height of a sheet metal test point at the highest point of the Z shaft; the highest Z axis is: 0 stroke origin or safe height; because of the flexibility and unpredictability of the measurement parts, it is desirable to dynamically measure the sheet metal vertical height of the spot in real time without prior establishment of a measurement model, thereby providing an optimal reference distance for the line laser scanner to operate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310441708.XA CN116399216A (en) | 2023-04-23 | 2023-04-23 | Workpiece surface thickness measuring method |
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| CN117091521A (en) * | 2023-10-19 | 2023-11-21 | 靖江市黄埔机械部件制造有限公司 | Automatic conveying and feeding thickness detection method and system for brake welding equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117091521A (en) * | 2023-10-19 | 2023-11-21 | 靖江市黄埔机械部件制造有限公司 | Automatic conveying and feeding thickness detection method and system for brake welding equipment |
| CN117091521B (en) * | 2023-10-19 | 2023-12-22 | 靖江市黄埔机械部件制造有限公司 | Automatic conveying and feeding thickness detection method and system for brake welding equipment |
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