A flatness measuring device and a method of using the same

Abstract

A flatness measuring device and a method for using the same include a laser probe, a one-dimensional electric translation stage, a rotary structure, a measured plane and a host computer system. The laser probe includes: a triangulation laser sensor, a mounting frame, a lithium battery, a single-chip microcomputer system, a Bluetooth antenna, a translation motor driver, a first screw, a wire screw sleeve, a second screw, a compression nut, a battery pressure plate and a first flange; the laser probe is connected to the one-dimensional electric translation stage through the first flange, and the one-dimensional electric translation stage is connected to the rotary structure through the second flange arranged at the bottom. The lithium battery provides power for the triangulation laser sensor, the single-chip microcomputer system, the translation motor driver and the translation motor of the one-dimensional electric translation stage. The rotary structure drives the one-dimensional electric translation stage and the laser probe to rotate, realizes laser scanning of circular lines of different radii of the measured plane, uses the normal plane of the rotation axis as the reference plane, calculates the flatness according to the scanning data on each circular line, and then fuses the flatness of multiple circular lines to obtain the comprehensive flatness after eliminating the plane slope. The measuring standard of the present invention is stable, the detection accuracy and efficiency are high, the operation is convenient, and the measuring device can be used independently or together with other equipment to complete on-machine measurement.

Description

Technical Field

[0001] The present invention relates to the field of precise measurement of shape errors, and in particular to a flatness measuring device and a use method thereof. Background Art

[0002] In modern manufacturing, as customers have higher and higher requirements for product quality, product testing requirements are becoming more and more stringent. In some mass consumer products, such as vises, the flatness of the jaws directly affects the quality of the jaws and the service life of the product. Therefore, fast, high-precision, on-machine flatness measurement devices are increasingly favored by manufacturers. Traditional measurement methods mainly use contact methods, which are complicated to operate and have low measurement efficiency.

[0003] Among the existing non-contact flatness measurement methods, optical methods are mainly used. CN201811574389.5 discloses a non-contact flatness measurement device, which can obtain detection data by using reflected light waves through spectral processing equipment, and obtain multiple detection point height values ​​by moving the stage. The detection speed is slow and the accuracy is affected by the motion accuracy of the stage; CN2015108558576 discloses a non-contact non-continuous plane flatness measurement system and method, in which the reference plane is obtained by detection by a position sensor, and the data of the measured surface is obtained by a laser displacement sensor. In this method, the measurement accuracy of the position sensor and the plane motion error of the machine tool will directly affect the measurement result, and the accuracy is limited. CN200910180108.2 discloses a flatness measurement method for slow-moving wire cutting tungsten and tungsten alloy devices, which forms a triangular relationship between the laser, the object to be measured and the imaging system, and solves the measurement data of each point. In this method, the error of the stage motion plane affects the measurement accuracy. CN201720374711.4 discloses a non-contact laser product inspection system. After the laser generator emits the laser, it is reflected on the sample and received by the laser receiver. The different optical path differences at different positions are used to determine whether the product flatness meets the requirements. It is only suitable for occasions with low precision requirements. CN201811096565.9 discloses a parallelism and flatness measurement device and method for circular low-rigidity workpieces. Multi-channel ventilation is used to make the workpiece suspended during measurement, and the suspended moving plane is used as the reference plane. A distance sensor is used for non-contact measurement. It is only suitable for measuring the flatness and parallelism of circular low-rigidity non-magnetic material workpieces. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned technologies, the object of the present invention is to provide a flatness measuring device and a method for using the device which is easy to operate, has high detection accuracy and is easy to realize automated operation.

[0005] On the one hand, the present invention provides a flatness measuring device: including a laser probe 100, a one-dimensional electric translation stage 200, a rotary structure 300, a measured plane 400 and a host computer system 500: the laser probe 100 includes: a triangulation laser sensor 101, a mounting frame 102, a lithium battery 103, a single-chip computer system 104, a Bluetooth antenna 105, a translation motor driver 106, a first screw 108, a wire screw sleeve 109, a second screw 110, a compression nut 111, a battery pressure plate 112 and a first flange 113; the first screw The nail 108 and the wire screw sleeve 109 clamp the single-chip computer system 104 and the translation motor driver 106 on the left side 102 of the mounting frame; the second screw 110 and the clamping nut 111 clamp the triangulation laser sensor 101 in the middle of the mounting frame 102, and the battery pressure plate 112 is used to clamp the lithium battery 103 on the right side 102 of the mounting frame; the laser probe 100 is connected to the one-dimensional electric translation stage 200 through the first flange 113; the one-dimensional electric translation stage 200 is connected to the rotating structure 400 through the second flange 201 arranged at the bottom.

[0006] Furthermore, the lithium battery 103 provides power for the triangulation laser sensor 101 , the single-chip computer system 104 , the translation motor driver 106 , and the translation motor 202 of the one-dimensional electric translation stage 200 .

[0007] Furthermore, the data collected by the triangulation laser sensor 101 can be pre-processed by the single-chip microcomputer system 104 and then transmitted to the host computer system 500 ; the single-chip microcomputer system 104 can provide control commands to the translation motor driver 106 .

[0008] Furthermore, the rotary structure 300 drives the one-dimensional electric translation stage 200 and the laser probe 100 to rotate, so as to realize circular scanning of the measured plane 400 by the laser, and the one-dimensional electric translation stage 200 can adjust the circular scanning radius.

[0009] On the other hand, the present invention provides a method for using the above device, comprising the following steps:

[0010] 1) Start the rotary structure 300 to drive the one-dimensional electric translation stage 200 and the laser probe 100 to rotate;

[0011] 2) The single chip computer system 104 controls the one-dimensional electric translation stage 200 to move to the maximum scannable circular radius position, and the laser probe 100 scans the measured plane 400 to measure the longitudinal and lateral slopes between the measured plane 400 and the rotation normal plane;

[0012] 3) Control the dovetail slide 204 of the one-dimensional electric translation stage 200 to move to position 1 of the specified scanning radius, and the laser probe 100 performs circular scanning at position 1 to form scanning point cloud data. The upper computer system calculates the flatness of the circle after eliminating the influence of the slope according to the flatness evaluation method;

[0013] 4) Repeat step 3), the laser probe 100 performs circular scanning at position n (n=2, 3, ...N, N>5), and calculates the flatness of the circle based on the point cloud data on the measured circle;

[0014] 5) The average of the flatness of the scanned circle obtained in step 3) and step 4) represents the actual flatness of the measured plane.

[0015] Furthermore, in the above step 2, the circumferential radius is equal to the distance between the rotation axis and the laser beam, and the maximum scanning circumferential radius is determined by the travel range of the one-dimensional electric translation stage 200 and the size of the measured plane 400.

[0016] The beneficial effects of the present invention include: the laser probe 100 and the one-dimensional electric translation stage 200 in the device are powered by a lithium battery 103, and the device has no winding interference when rotating; the micro triangulation laser sensor 101 and the small-stroke one-dimensional electric translation stage 200 are selected to make the device small in space and light in weight; the single-chip computer system is provided with a wireless communication function, and the measurement results can also be transmitted to a host computer such as a numerical control system. Therefore, the present invention can be used independently, and can also be used with a process device such as a machine tool and a robot equipped with a rotating spindle to perform on-machine measurement of a plane in a processing state, thereby improving the production efficiency and quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a flatness measuring device;

[0018] Figure 2 is a schematic diagram of a laser probe;

[0019] Figure 3 It is the electrical connection between the laser probe and the one-dimensional electric translation stage;

[0020] Figure 4 It is a schematic diagram of the measurement model.

[0021] In the figure: 100. laser probe; 200. one-dimensional electric translation stage; 300. rotary structure; 400. measured plane; 500. host computer system; 101. triangulation laser sensor; 102. mounting frame; 103. lithium battery; 104. single-chip computer system; 105. Bluetooth antenna; 106. translation motor driver; 107. laser beam; 108. first screw; 109. wire thread sleeve; 110. second screw; 111. clamping nut; 112. battery pressure plate; 113. first flange; 201. second flange; 202. translation motor; 203. dovetail slide; 204. dovetail slide; 301. rotary structure frame; 302. rotary spindle; 303. chuck. DETAILED DESCRIPTION

[0022] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0023] refer to Figure 1~Figure 3 A flatness measuring device includes a laser probe 100, a one-dimensional electric translation stage 200, a rotating structure 300, a measured plane 400 and a host computer system 500. The laser probe 100 is connected to the one-dimensional electric translation stage 200 through a first flange 113; the one-dimensional electric translation stage 200 is connected to the rotating structure 400 through a second flange 201 arranged at the bottom.

[0024] Specifically, the laser probe 100 includes: a triangulation laser sensor 101, a mounting frame 102, a lithium battery 103, a single-chip computer system 104, a Bluetooth antenna 10), a translation motor driver 106, a first screw 108, a wire screw sleeve 109, a second screw 110, a clamping nut 111, a battery pressure plate 112 and a first flange 113. The first screw 108 and the wire screw sleeve 109 clamp the single-chip computer system 104 and the translation motor driver 106 on the left side 102 of the mounting frame. The second screw 110 and the clamping nut 111 clamp the triangulation laser sensor 101 in the middle of the mounting frame 102, and the battery pressure plate 112 clamps the lithium battery 103 on the right side 102 of the mounting frame.

[0025] As a preferred embodiment of the present invention, the lithium battery 103 provides power for the triangulation laser sensor 101, the single-chip computer system 104, the translation motor driver 106 and the translation motor 202 of the one-dimensional electric translation stage 200, and the output voltage of the lithium battery 103 is consistent with the driving voltage of the triangulation laser sensor 101 and the translation motor 202.

[0026] As a preferred embodiment of the present invention, the data collected by the triangulation laser sensor 101 can be pre-processed by the single-chip computer system 104 and then transmitted to the host computer system 500 via the Bluetooth antenna 105 .

[0027] As a preferred embodiment of the present invention, the single chip computer system 104 can provide control commands to the translation motor driver 106 .

[0028] As a preferred embodiment of the present invention, the rotary structure 300 drives the one-dimensional electric translation stage 200 and the laser probe 100 to rotate, so as to realize circular scanning of the measured plane 400 by the laser. The one-dimensional electric translation stage 200 can adjust the circular scanning radius.

[0029] refer to Figure 4 The method of using the above device is implemented as follows.

[0030] In the first step, the rotary structure 300 is started to drive the one-dimensional electric translation stage 200 and the laser probe 100 to rotate.

[0031] In the second step, the single chip microcomputer system 104 controls the one-dimensional electric translation stage 200 to move to the maximum scannable circular radius position, and the laser probe 400 scans the measured plane 400 to measure the longitudinal and lateral slopes between the measured plane 400 and the rotation normal plane.

[0032] The third step is to control the dovetail slide 204 of the one-dimensional electric translation stage 200 to move to position 1 of the specified scanning radius. The laser probe 100 performs a circular scan at position 1 to form scanning point cloud data. The upper computer system calculates the flatness of the circle after eliminating the influence of the slope according to the flatness evaluation method.

[0033] In the fourth step, repeat step 3), the laser probe 100 performs a circular scan at position n (n=2, 3, ...N, N>5), and calculates the flatness of the circle based on the point cloud data on the measured circle.

[0034] Step 5: The average of the flatness of the scanned circle obtained in step 3) and step 4) is used to represent the actual flatness of the measured plane.

[0035] As a preferred embodiment of the present invention, in the above step 2, the circumference radius r It is equal to the distance between the rotation axis and the laser beam. The maximum scanning circle radius is determined by the travel range of the one-dimensional electric translation stage 200 and the size of the measured plane 400.

[0036] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A flatness measuring device, characterized in that: The invention comprises a laser measuring head (100), a one-dimensional electric translation stage (200), a rotary structure (300), a measured plane (400) and a host computer system (500): The laser probe (100) comprises: a triangulation laser sensor (101), a mounting frame (102), a lithium battery (103), a single chip computer system (104), a Bluetooth antenna (105), a translation motor driver (106), a first screw (108), a wire screw sleeve (109), a second screw (110), a compression nut (111), a battery pressure plate (112) and a first flange (113); the first screw (108) and the wire screw sleeve (109) connect the single chip computer system to the battery. The triangulation laser sensor (101) is clamped in the middle of the mounting frame (102) by the second screw (110) and the clamping nut (111), and the lithium battery (103) is clamped in the right side of the mounting frame (102) by the battery pressure plate (112); the data collected by the triangulation laser sensor (101) can be transmitted to the single chip microcomputer system (104) is pre-processed and transmitted to the host computer system (500) through the Bluetooth antenna (105); the laser probe (100) is connected to the one-dimensional electric translation stage (200) through the first flange (113); the one-dimensional electric translation stage (200) is connected to the rotary structure (300) through the second flange (201) arranged at the bottom; the lithium battery (103) is used for the triangulation laser sensor (101), the single-chip computer system (104), The translation motor driver (106) and the translation motor (202) of the one-dimensional electric translation stage (200) provide power; the single-chip computer system (104) can provide control commands to the translation motor driver (106); the rotary structure (300) drives the one-dimensional electric translation stage (200) and the laser probe (100) to rotate, thereby realizing circular scanning of the measured plane (400) by the laser, and the one-dimensional electric translation stage (200) can adjust the circular scanning radius.

2. A method for using a flatness measuring device as claimed in claim 1, characterized in that: The following steps are included: 1) starting the rotary structure (300) to drive the one-dimensional electric translation stage (200) and the laser probe (100) to rotate; 2) the single chip computer system (104) controls the one-dimensional electric translation stage (200) to move to the maximum scannable circular radius position, and the laser probe (100) scans the measured plane (400) to measure the longitudinal and lateral slopes between the measured plane (400) and the rotation normal plane; 3) controlling the dovetail slide (204) of the one-dimensional electric translation stage (200) to move to position 1 of a specified scanning radius, the laser probe performs circular scanning at position 1 to form scanning point cloud data, and the upper computer system calculates the flatness of the circle after eliminating the influence of the slope according to the flatness evaluation method; 4) Repeat step 3), the laser probe (100) performs circular scanning at different positions n, where n=2, 3, ... N, N>5, and calculates the flatness of the circumference based on the point cloud data of the measured circle; 5) The average of the flatness of the scanning circle obtained in step 3) and step 4) represents the comprehensive flatness of the measured plane.

3. The method of use according to claim 2, characterized in that: In step 2, the circumferential radius is equal to the distance between the rotation axis and the laser beam, and the maximum scanning circumferential radius is determined by the travel range of the one-dimensional electric translation stage (200) and the size of the measured plane (400).

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