CN108747825B - A device for laser dressing and shaping grinding wheel based on visual inspection and its dressing method - Google Patents
A device for laser dressing and shaping grinding wheel based on visual inspection and its dressing method Download PDFInfo
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- CN108747825B CN108747825B CN201810632377.7A CN201810632377A CN108747825B CN 108747825 B CN108747825 B CN 108747825B CN 201810632377 A CN201810632377 A CN 201810632377A CN 108747825 B CN108747825 B CN 108747825B
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- 238000000227 grinding Methods 0.000 title claims abstract description 191
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000007493 shaping process Methods 0.000 title abstract description 13
- 238000011179 visual inspection Methods 0.000 title abstract description 6
- 238000009966 trimming Methods 0.000 claims abstract description 26
- 238000000608 laser ablation Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 12
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/12—Dressing tools; Holders therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
本发明提供了一种基于投影法轮廓检测激光修整成型砂轮装置，具体包括计算机(1)，背光源(2)，三维移动台(3)，光纤激光器(4)，激光烧蚀头(5)，成型砂轮(6)，磨床(7)，远心镜头(8)、CCD相机(9)，图像采集卡(10)，通过将视觉检测与激光修整进行结合，能够实现高效高精度自动化成型砂轮修整过程，运行稳定,后期装备维持和操作费用非常低，可以节省大量的人工成本,为企业带来可观利益大大节约生产成本。同时该方法具备很大的灵活性，能够快速拆卸与安装，对被检测对象环境要求极低，操作简便，并且能够适应不同种类测量，柔性极高。
The invention provides a laser trimming and shaping grinding wheel device based on projection method profile detection, which specifically comprises a computer (1), a backlight source (2), a three-dimensional moving table (3), a fiber laser (4), and a laser ablation head (5) , forming grinding wheel (6), grinding machine (7), telecentric lens (8), CCD camera (9), image acquisition card (10), through the combination of visual inspection and laser dressing, it can realize high-efficiency and high-precision automatic forming grinding wheel The trimming process is stable in operation, and the maintenance and operation costs of equipment in the later stage are very low, which can save a lot of labor costs and bring considerable benefits to enterprises and greatly save production costs. At the same time, the method has great flexibility, can be quickly disassembled and installed, has extremely low requirements on the environment of the detected object, is easy to operate, can adapt to different types of measurements, and is extremely flexible.
Description
Technical Field
The invention relates to a grinding wheel dressing method, in particular to a laser dressing forming grinding wheel device based on visual detection and a dressing method thereof.
Background
Along with the wide application of difficult-to-process material devices such as engineering ceramics, optical glass, hard alloy and the like to various key equipment, the grinding processing of various complex profile parts is gradually increased, and meanwhile, various complex profile parts are ground by using a superhard forming grinding wheel. The superhard forming grinding wheel is a cubic boron nitride and diamond forming grinding wheel, and is shown in figure 1. It has very good grinding properties, such as strong abrasion resistance, good thermal conductivity, extremely high hardness, etc., but it is the superhard grinding wheel with the above properties that makes the dressing process very difficult. Therefore, in order to maintain the precision of the superhard grinding wheel geometry and the sharpness of the abrasive grains during the grinding process, the superhard grinding wheel needs to be dressed periodically.
Because of various types of formed grinding wheels, the adopted dressing methods are different greatly, and the most common formed grinding wheel dressing method at present adopts a manual dressing method, but the dressing efficiency of the method is low, and the profile precision after dressing is difficult to ensure. Although many new finishing processes have emerged, such as: turning dressing, grinding dressing, roller dressing, spark dressing, on-line electrolytic dressing, etc., but still suffer from a number of disadvantages, such as: the method has the advantages of poor grinding performance, low grinding wheel shape precision, low dressing efficiency, relatively high cost, high requirement on processing environment, incapability of detecting whether the formed grinding wheel is up to the standard in real time, low dressing precision and unsuitability for efficient and high-precision dressing of the formed grinding wheel.
Meanwhile, the contour detection technology of the formed grinding wheel mainly observes the effect after grinding through a super-depth-of-field three-dimensional scanning microscope or directly grinding a workpiece, and has the following defects: the former has high requirements on the use environment, and is generally required to be carried out in a dust-free environment, so the grinding wheel needs to be detached from the grinding machine for observation, the use process is troublesome, the equipment is expensive, and the use and maintenance cost is high. Although the latter method has lower use cost and is relatively easy to operate and implement than the former method, the actual situation is that the profile dressing of the formed grinding wheel cannot meet the precision requirement in the first dressing, so the grinding wheel needs to be detached from the grinding machine, dressed again and then installed on the grinding machine for grinding again to observe the effect of the ground workpiece.
At present, with the development of the visual inspection technology, an object to be inspected is imaged on a photosensitive element of a camera through an optical element, so that the image can be digitized, then the image is processed and detected through a computer, non-contact precision measurement can be realized, the interference of subjective factors of artificial detection is eliminated, and the production efficiency can be further improved through integrated automatic equipment. Meanwhile, the non-contact online shaping grinding wheel finishing of the shaping grinding wheel can be realized by combining laser finishing, the edge profile information of the shaping grinding wheel is collected by a CCD camera, the characteristic profile information of the shaping grinding wheel is identified and extracted by utilizing a computer control algorithm, then the similarity of the characteristic profile information and the edge profile characteristic of the standard shaping grinding wheel is compared, the defect area of the shaping grinding wheel to be finished is detected, a computer outputs a corresponding NC control instruction through automatic planning, a three-dimensional moving platform loaded with a laser ablation head moves along a specific track, and the defect area of the shaping grinding wheel is removed by utilizing focused high-energy laser beams, so that the shaping grinding wheel reaches a specified geometric shape, and the shaping grinding wheel is finished.
With the development of computer control technology, the visual detection technology and the laser precision machining are combined, so that the on-machine dressing process of the high-efficiency, high-precision and full-automatic forming grinding wheel can be realized, and the laser dressing technology of the forming grinding wheel is not only limited to the development of superhard grinding materials and precision, but gradually develops towards the development of intellectualization.
Disclosure of Invention
The invention aims to provide a non-contact measuring method, namely, a CCD camera is adopted to extract the edge profile characteristics of a formed grinding wheel, and the influence of external forces such as man-made interference and the like on a detected workpiece by contact measurement is eliminated. Meanwhile, the digital image is adopted for processing, so that the acquisition speed is high, the work is stable, and the long-time stable work can be realized.
The technical scheme of the invention provides a laser trimming and forming grinding wheel device based on projection method profile detection, which specifically comprises a computer, a backlight source, a three-dimensional mobile platform, a fiber laser, a laser ablation head, a forming grinding wheel, a grinding machine, a telecentric lens, a CCD camera and an image acquisition card; the method is characterized in that:
the laser ablation head is fixedly arranged on the three-dimensional moving platform, the mounting grinding machine drives the forming grinding wheel to rotate, the telecentric lens is vertically arranged at the right upper part of the forming grinding wheel, the optical axis of the telecentric lens is tangent to the periphery of the forming grinding wheel, and the tangent point is just positioned at the focus position of the telecentric lens;
the backlight source is positioned at the right lower part of the telecentric lens, and the CCD camera and the telecentric lens are connected together through an interface to form an image acquisition system;
the image acquisition card is connected with the CCD camera through a signal line, the computer receives data from the image acquisition card, processes the edge profile information of the formed grinding wheel, extracts profile characteristic information, compares the profile characteristic information with the edge profile characteristic of the standard formed grinding wheel in similarity, detects a defect area of the formed grinding wheel to be trimmed, sequentially calculates the error allowance of the grinding wheel to be formed by the computer, performs real-time compensation, automatically plans the movement track of the laser trimmed formed grinding wheel and generates a corresponding NC control instruction;
the laser ablation head is arranged and fixed on the three-dimensional moving platform and horizontally placed on the left side of the grinding wheel, and the three-dimensional moving platform is controlled by the computer, so that the laser ablation head can move along a preset track in the x direction, the y direction and the z direction.
The invention also provides a method for detecting the grinding wheel dressed by the laser grinding wheel dressing device based on visual detection, which is characterized by comprising the following steps of:
step 1: firstly, mounting a grinding wheel on a grinding machine, and adjusting the grinding machine to a preset rotating speed;
step 2: starting a fiber laser to emit laser through a computer, and setting laser trimming parameters to enable laser ablation hair to emit laser beams to irradiate the surface of the grinding wheel;
and step 3: the three-dimensional mobile station receives an NC control instruction from a computer, drives the laser ablation head to move along the track of the laser trimming forming grinding wheel, and enables the focused laser spot to move along the axial direction and the radial direction of the forming grinding wheel, so as to realize the rough trimming of the forming grinding wheel;
and 4, step 4: opening a backlight source, enabling the backlight source to be capable of irradiating on the tangential profile surface of the molding grinding wheel, and starting a CCD camera to realize image acquisition of the tangential edge profile of the molding grinding wheel;
and 5: the image acquisition card receives a signal from the CCD camera, and converts the signal into a digital image signal after digital sampling;
step 6: the computer receives the digital image signal from the image acquisition card and finishes the image denoising pretreatment work;
and 7: the computer divides and extracts the edge of the image which is preprocessed by digital filtering and the like, extracts the edge information of the tangential outline of the molding grinding wheel and converts the edge information into a corresponding vector diagram;
and 8: and matching the extracted edge profile characteristics of the formed grinding wheel into a specific coordinate system by the computer.
And step 9: the computer compares the extracted edge profile characteristics of the formed grinding wheel with the standard profile characteristics of the formed grinding wheel loaded into a coordinate system in advance, judges whether the edge profile shape of the detected formed grinding wheel meets the precision requirement of the preset finishing shape, if so, the process of finishing the formed grinding wheel by laser is finished, otherwise, the fine finishing process of the formed grinding wheel is continued
The invention has the beneficial effects that:
the method described in the patent adopts the CCD camera to extract the edge profile characteristics of the formed grinding wheel, belongs to a non-contact measuring method, and eliminates the influence of external forces such as artificial interference and the like on a detected workpiece by contact measurement. Meanwhile, the digital image is adopted for processing, so that the acquisition speed is high, the work is stable, the work can be stably carried out for a long time, and the manual work cannot be carried out. The laser dressing method as an efficient grinding wheel dressing method has the advantages of no mechanical force action, high efficiency, easiness in integrated control and the like, and has incomparable advantages compared with other traditional grinding wheel dressing technologies. Through combining visual detection and laser trimming, can realize the automatic shaping emery wheel of high-efficient high accuracy and maintain the process, the operation is stable, and later stage equipment is kept and the operating cost is very low, can save a large amount of cost of labor, brings considerable interests for the enterprise and practices thrift manufacturing cost greatly. Meanwhile, the method has great flexibility, can be quickly disassembled and assembled, has extremely low requirement on the environment of the detected object, is simple and convenient to operate, can adapt to different types of measurement, and has extremely high flexibility.
Drawings
FIG. 1 is a schematic view of a laser truing formed wheel apparatus based on visual inspection and detection in accordance with the present invention;
FIG. 2 is a flow chart of the laser truing and shaping wheel apparatus for grinding wheel truing based on visual inspection according to the present invention;
figure 3 is a schematic view of the profile features of a molding sand to be trimmed.
Wherein: 1. the device comprises a computer, 2, a backlight source, 3, a three-dimensional mobile station, 4, a fiber laser, 5, a laser ablation head, 6, a molding grinding wheel, 7, a grinding machine, 8, a telecentric lens, 9, a CCD camera, 10 and an image acquisition card.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying fig. 1-3.
As shown in fig. 1, the device for detecting a profile of a laser-trimmed formed grinding wheel based on a projection method described in the present invention specifically includes a computer 1, a backlight source 2, a three-dimensional moving stage 3, a fiber laser 4, a laser ablation head 5, a formed grinding wheel 6, a grinding machine 7, a telecentric lens 8, a CCD camera 9, and an image acquisition card 10;
a laser ablation head 5 is arranged on a fiber laser 4, a forming grinding wheel 6 is arranged on a controllable grinding machine 7, the forming grinding wheel 6 is driven to rotate by the grinding machine 7, a telecentric lens 8 is vertically arranged at the right upper part of the forming grinding wheel 6, the optical axis of the telecentric lens is tangent to the periphery of the forming grinding wheel, meanwhile, the tangent point is just positioned at the focus position of the telecentric lens, a backlight source 2 is positioned under the telecentric lens, the forming grinding wheel 6 is arranged between the telecentric lens 8 and the backlight source 2, a CCD camera 9 and the telecentric lens 8 are connected together through an interface to form an image acquisition system, an image acquisition card 10 is connected with the CCD camera 9 through a signal line, a computer 1 receives data from the image acquisition card 10, processes the edge profile information of the forming grinding wheel 6, extracts profile characteristic information, performs corresponding coordinate conversion, and then performs similarity comparison with the edge profile characteristic of a standard forming, detecting the defect area of the formed grinding wheel to be trimmed, sequentially calculating the error allowance of the grinding wheel to be formed by the computer 1, compensating in real time, automatically planning the motion track of the laser trimming formed grinding wheel and generating a corresponding NC control instruction, installing and fixing the laser ablation head 5 on the three-dimensional moving platform 3, horizontally placing the laser ablation head on the left side of the grinding wheel according to the tangential direction, controlling the three-dimensional moving platform 3 by the computer 1 to enable the laser ablation head 5 to move along the preset track in the x, y and z directions, simultaneously controlling the power density and the pulse frequency of the optical fiber laser 4 by the computer 1 to realize the forming trimming process of the formed grinding wheel 6, shooting the picture of the formed grinding wheel profile by the CCD camera again by the computer when the process is finished, and judging whether the extracted formed grinding wheel profile is qualified or. If not, the computer outputs corresponding numerical control signals again to control the laser ablation head to finish the corresponding laser trimming process until the formed grinding wheel reaches the specified geometric shape precision, and finally the trimming of the formed grinding wheel is finished.
As shown in fig. 2 to 3, an embodiment of the present invention further provides a method for dressing a grinding wheel by using a laser dressing molding grinding wheel device based on visual inspection, which specifically includes:
step 1: firstly, the grinding wheel is arranged on a grinding machine, the grinding machine is adjusted to a preset rotating speed,
in the step, the rotating speed of the grinding machine is adjusted to be 300r/min, so that the grinding wheel is driven to rotate at a constant speed of 300 r/min.
Step 2: starting a fiber laser to emit laser through a computer, and setting laser trimming parameters to enable laser ablation hair to emit laser beams to irradiate the surface of the grinding wheel;
the average power of the fiber laser machine was set to 100W and the repetition rate was set to 50khz in this step.
And step 3: the three-dimensional mobile station receives an NC control instruction from a computer, drives the laser ablation head to move along the track of the laser trimming forming grinding wheel, and enables the focused laser spot to move along the axial direction and the radial direction of the forming grinding wheel, so as to realize the rough trimming of the forming grinding wheel;
in the step, focused laser moves along the axial direction and the radial direction of the formed grinding wheel, so that grinding wheel abrasive particles and a binding agent are removed simultaneously, the rough finishing process of the formed grinding wheel is completed, and meanwhile, a certain finishing allowance is reserved for facilitating the next fine finishing;
and 4, step 4: opening a backlight source to enable the backlight source to irradiate on a tangential profile surface of the molding grinding wheel, and starting a CCD camera to realize image acquisition of the tangential edge profile of the molding grinding wheel;
in the step, the detected molding grinding wheel is placed at the left lower part of the telecentric lens, the circumference of the molding grinding wheel is tangent to the optical axis of the telecentric lens, the tangent point is positioned at the focal plane position of the telecentric lens, and the brightness of the parallel backlight source is set to a proper range, so that the CCD camera can collect an image with clear picture, and the image collection of the tangential edge profile of the molding grinding wheel is completed.
And 5: the image acquisition card receives a signal from the CCD camera, and converts the signal into a digital image signal after digital sampling;
in the step, an image acquisition card receives signals from a CCD camera, and the signals are converted into digital image signals which can be processed by a computer after being digitally sampled.
Step 6: the computer receives the digital image signal from the image acquisition card and completes the preprocessing work such as image denoising and the like;
the step is mainly used for removing the influence of various environmental noise signals contained in the digital image signals from the image acquisition card through preprocessing such as digital filtering, and the like, because the digital images are inevitably interfered by various environmental noises such as imaging equipment and the like in the digitalization, transmission and processing processes, and the noise-containing images are obtained. In order to reduce the influence of environmental noise on subsequent image processing, it is necessary to perform denoising processing on an image acquired by a CCD camera. Unnecessary interference information in the image is removed, and image information is restored and improved.
And 7: the computer divides and extracts the edge of the image which is preprocessed by digital filtering and the like, extracts the edge information of the tangential outline of the molding grinding wheel and converts the edge information into a corresponding vector diagram;
in the step, an edge profile image of the formed grinding wheel is segmented from an image subjected to preprocessing such as digital filtering, edge extraction is carried out, then edge profile characteristics of the formed grinding wheel are extracted, and finally, corresponding description is carried out on the edge profile characteristics of the formed grinding wheel, wherein the edge profile characteristics mainly comprise geometrical characteristics such as length, curvature, diameter and the like.
And 8: and matching the extracted edge profile characteristics of the formed grinding wheel into a specific coordinate system by the computer.
The specific implementation method of the step can realize the characteristic coordinate matching of the edge profile of the formed grinding wheel by selecting a specific characteristic of the edge profile of the grinding wheel, such as the end face of the grinding wheel, and then carrying out overall coordinate transformation on the extracted edge profile characteristic of the formed grinding wheel.
And step 9: and the computer compares the extracted edge profile characteristics of the formed grinding wheel with the standard profile characteristics of the formed grinding wheel loaded into a coordinate system in advance, judges whether the edge profile shape of the detected formed grinding wheel meets the preset shape precision requirement, and if the similarity between the extracted edge profile characteristics of the formed grinding wheel and the standard profile characteristics of the formed grinding wheel meets the preset shape precision requirement, the laser trimming process of the formed grinding wheel is finished, otherwise, the finish trimming process of the formed grinding wheel is continued.
The step is mainly to detect whether the edge profile shape of the formed grinding wheel reaches the expected shape precision requirement in the laser trimming process of the formed grinding wheel so as to confirm whether further laser trimming is needed.
Step 10: and comparing the edge profile characteristics of the extracted formed grinding wheel with the profile characteristics of a standard formed grinding wheel, calculating the error allowance of the grinding wheel to be formed by using a computer, compensating in real time by using the computer, automatically planning the telecontrol track of the laser trimming formed grinding wheel and generating a corresponding NC control instruction. And (5) repeating the steps 3-10 until the contour shape precision of the formed grinding wheel meets the expected requirement.
The step is mainly to calculate the allowance of the formed grinding wheel to be further finished through a computer, and simultaneously, to output a motion control code of a laser ablation head for finishing the formed grinding wheel, so as to finish the finishing process of the formed grinding wheel.
While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details of the embodiments are not to be interpreted as limiting the scope of the invention, and any obvious changes, such as equivalent alterations, simple substitutions and the like, based on the technical solution of the invention, can be interpreted without departing from the spirit and scope of the invention.
Claims (3)
1. A laser trimming and forming grinding wheel device based on projection method profile detection specifically comprises a computer (1), a backlight source (2), a three-dimensional moving platform (3), a fiber laser (4), a laser ablation head (5), a forming grinding wheel (6), a grinding machine (7), a telecentric lens (8), a CCD camera (9) and an image acquisition card (10); the method is characterized in that:
the laser ablation head (5) is fixedly arranged on the three-dimensional moving platform (3), the grinding machine (7) drives the forming grinding wheel (6) to rotate, the telecentric lens (8) is vertically placed at the right upper part of the forming grinding wheel (6), the optical axis of the telecentric lens (8) is tangent to the periphery of the forming grinding wheel, and the tangent point is just positioned at the focus position of the telecentric lens;
the backlight source (2) is positioned at the lower right side of the telecentric lens (8), and the CCD camera (9) and the telecentric lens (8) are connected together through an interface to form an image acquisition system;
the image acquisition card (10) is connected with the CCD camera (9) through a signal line, the computer (1) receives data from the image acquisition card (10), the edge profile information of the formed grinding wheel (6) is processed, the profile characteristic information is extracted, similarity comparison is carried out on the edge profile information of the formed grinding wheel and the edge profile characteristic of a standard formed grinding wheel, the defect area of the formed grinding wheel to be trimmed is detected, the computer (1) sequentially calculates the error allowance of the grinding wheel to be formed, real-time compensation is carried out, the movement track of the laser trimmed formed grinding wheel is automatically planned, and a corresponding NC control instruction is generated; the computer (1) can control the power density and the pulse frequency of the fiber laser (4);
the laser ablation head (5) is arranged on the three-dimensional moving platform (3) and horizontally placed on the left side of the grinding wheel, and the computer (1) controls the three-dimensional moving platform (3) to enable the laser ablation head (5) to move along a preset track in the x direction, the y direction and the z direction;
shooting a picture of the profile of the molded grinding wheel through a CCD camera, and judging whether the extracted profile of the molded grinding wheel is qualified or not; if not, the computer outputs corresponding numerical control signals again to control the laser ablation head to complete the corresponding laser trimming process.
2. The method for dressing the grinding wheel by the laser dressing molding grinding wheel device based on projection profile detection according to claim 1, characterized by comprising the following steps:
step 1: firstly, mounting a grinding wheel on a grinding machine, and adjusting the grinding machine to a preset rotating speed; the preset rotating speed is set to be 300r/min, so that the grinding wheel is driven to rotate at a constant speed of 300 r/min;
step 2: starting a fiber laser to emit laser through a computer, and setting laser trimming parameters to enable laser ablation hair to emit laser beams to irradiate the surface of the grinding wheel;
and step 3: the three-dimensional mobile station receives an NC control instruction from a computer, drives the laser ablation head to move along the track of the laser trimming forming grinding wheel, and enables the focused laser spot to move along the axial direction and the radial direction of the forming grinding wheel, so as to realize the rough trimming of the forming grinding wheel;
and 4, step 4: opening a backlight source, enabling the backlight source to be capable of irradiating on the tangential profile surface of the molding grinding wheel, and starting a CCD camera to realize image acquisition of the tangential edge profile of the molding grinding wheel; the detected molding grinding wheel is placed at the left lower part of the telecentric lens, the circumference of the molding grinding wheel is tangent to the optical axis of the telecentric lens, and the tangent point is positioned on the focal plane position of the telecentric lens, so that the CCD camera can collect images, and the image collection of the tangential edge profile of the molding grinding wheel is completed;
and 5: the image acquisition card receives a signal from the CCD camera, and converts the signal into a digital image signal after digital sampling;
step 6: the computer receives the digital image signal from the image acquisition card and finishes the image denoising pretreatment work;
and 7: the computer divides the image which is preprocessed by digital filtering and extracts the edge, extracts the edge information of the tangential outline of the molding grinding wheel and converts the edge information into a corresponding vector diagram; finally, the edge profile characteristics of the formed grinding wheel are correspondingly described, including the geometric characteristics of length, curvature and diameter;
and 8: matching the extracted edge profile characteristics of the formed grinding wheel into a specific coordinate system by the computer;
and step 9: and the computer compares the extracted edge profile characteristics of the formed grinding wheel with the standard profile characteristics of the formed grinding wheel loaded into a coordinate system in advance, judges whether the edge profile shape of the detected formed grinding wheel meets the precision requirement of the preset finishing shape, finishes the process of finishing the formed grinding wheel by laser if the edge profile shape of the detected formed grinding wheel meets the precision requirement of the preset finishing shape, and otherwise, continues to perform the fine finishing process of the formed grinding wheel.
3. The method for dressing a grinding wheel by using a laser dressing molding grinding wheel apparatus based on projection profile inspection as claimed in claim 2, wherein in step 2, the average power of the fiber laser machine is set to 100W, and the repetition frequency is set to 50 khz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632377.7A CN108747825B (en) | 2018-06-19 | 2018-06-19 | A device for laser dressing and shaping grinding wheel based on visual inspection and its dressing method |
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| CN201810632377.7A CN108747825B (en) | 2018-06-19 | 2018-06-19 | A device for laser dressing and shaping grinding wheel based on visual inspection and its dressing method |
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| CN108747825A CN108747825A (en) | 2018-11-06 |
| CN108747825B true CN108747825B (en) | 2020-04-21 |
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