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CN-122015755-A - Roughness measuring device and measuring method

CN122015755ACN 122015755 ACN122015755 ACN 122015755ACN-122015755-A

Abstract

The application relates to the technical field of roughness measurement and discloses a roughness measurement device and a roughness measurement method, wherein the roughness measurement device comprises a tool module, a measurement module and a motion control module, the tool module is used for positioning and fixing a workpiece, the measurement module comprises a first driving mechanism, a mounting seat, a measuring instrument and a camera, the mounting seat is arranged on the first driving mechanism, the camera and the measuring instrument are arranged on the mounting seat, the measuring instrument comprises a contact pin used for contacting the workpiece in a second direction, the first driving mechanism is used for driving the mounting seat to move in the first direction so as to enable the measuring instrument to measure the workpiece, the camera faces the first direction and is used for collecting images of the workpiece, the motion control module comprises a second driving mechanism and a third driving mechanism, the second driving device is used for driving the tool module and the measurement module to move relatively in the second direction, and the third driving device is used for driving the tool module and the measurement module to move relatively in the third direction. The application can improve the accuracy of movement control of the stylus.

Inventors

  • FANG TING
  • LI CAI
  • WANG MINGWEI

Assignees

  • 娄底市中兴液压件有限公司

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. A roughness measuring device, characterized by having a first direction, a second direction, and a third direction perpendicular to each other in pairs, comprising: The tool module (1) is used for positioning and fixing a workpiece (9); The measuring module (2) comprises a first driving mechanism (201), a mounting seat (202), a measuring instrument (203) and a camera (204), wherein the mounting seat (202) is arranged on the first driving mechanism (201), the camera (204) and the measuring instrument (203) are arranged on the mounting seat (202), the measuring instrument (203) comprises a contact pin (2031) used for contacting the workpiece (9) in the second direction, the first driving mechanism (201) is used for driving the mounting seat (202) to move in the first direction so that the measuring instrument (203) can measure the workpiece (9), and the camera (204) faces the first direction and is used for collecting images of the workpiece (9); the motion control module comprises a second driving mechanism (301) and a third driving mechanism (302), the second driving device is used for driving the tooling module (1) and the measuring module (2) to move relatively in the second direction, and the third driving device is used for driving the tooling module (1) and the measuring module (2) to move relatively in the third direction.
  2. 2. The roughness measurement device according to claim 1, wherein the tool module (1) is arranged in the second driving mechanism (301), and the measurement module (2) is arranged in the third driving mechanism (302).
  3. 3. Roughness measurement device according to claim 1, characterized in that the measurement module (2) further comprises a blow head (205), the blow head (205) being provided with a spout, which is directed towards the stylus (2031), for purging the workpiece (9) and the part of the stylus (2031) to be measured.
  4. 4. A roughness measurement device as claimed in claim 3, wherein the spout is inclined to the second direction.
  5. 5. The roughness measurement device according to claim 1, wherein the tool module (1) comprises a V-block (101), a clamping block (102) and a fourth driving mechanism (103), the V-block (101) and the clamping block (102) being arranged opposite in the second direction, the fourth driving mechanism (103) being adapted to drive the V-block (101) and the clamping block (102) for relative movement in the second direction.
  6. 6. The roughness measurement device according to claim 5, wherein the tool module (1) further comprises a plurality of buffer blocks (104), the buffer blocks (104) are respectively arranged on the V-shaped block (101) and the clamping block (102) and are used for being in contact with the workpiece (9), and the material of the buffer blocks (104) is self-lubricating plastic material.
  7. 7. A measurement method using the roughness measurement device according to any one of claims 1 to 6, the measurement method comprising: The workpiece (9) is placed on the tool module (1); -the measuring module (2) is moved in the first direction to a pre-configured reference plane; acquiring a real-time image acquired by the camera (204), and determining the focusing plane of the workpiece (9) and the position of the surface to be measured; -the measurement module (2) is moved in the first direction to a detection plane of the workpiece (9) and the focal length of the camera (204) is recalibrated; Aligning the stylus (2031) with a part to be measured of the surface to be measured in the third direction according to the real-time image; According to the real-time image, the contact pin (2031) is abutted against the part to be detected in the second direction; -measuring the workpiece (9).
  8. 8. The measurement method according to claim 7, wherein the bringing the stylus (2031) into abutment with the site to be measured in the second direction according to the real-time image includes: Determining a real-time distance between the contact pin (2031) and the part to be measured in the second direction according to the real-time image; when the real-time distance is greater than a pre-configured first distance, the contact pin (2031) is made to approach the part to be detected at a pre-configured first speed; When the real-time distance is smaller than or equal to the first distance and larger than a preset second distance, the contact pin (2031) is close to the part to be tested according to a preset second speed; When the real-time distance is smaller than or equal to the second distance, the contact pin (2031) is close to the part to be detected according to a preset third speed; wherein the third speed is less than the second speed, which is less than the first speed.
  9. 9. The measuring method according to claim 7, characterized in that said acquiring real-time images acquired by the camera (204), determining the position of the focal plane of the workpiece (9) and of the surface to be measured, comprises: Adjusting focusing parameters of the camera (204), and inputting the real-time image into a preset focusing evaluation function until the output result of the focusing evaluation function reaches the maximum value; calculating the coordinate position of the focusing plane according to the coordinate of the reference plane and the current focusing parameter; And fitting to obtain a contour curve of the surface to be measured according to the real-time image.
  10. 10. The measuring method according to claim 7, characterized in that said measuring the workpiece (9) comprises: The stylus (2031) is moved a preconfigured first distance in the first direction, acquiring acquired surface profile raw data; Removing the head and tail of the surface profile original data and the data in a preconfigured second distance range to obtain first processing data; filtering the first processing data by using a preconfigured filtering algorithm to obtain second processing data; and calculating the roughness of the workpiece (9) according to the second processing data.

Description

Roughness measuring device and measuring method Technical Field The application relates to the technical field of roughness measurement, in particular to a roughness measurement device and a roughness measurement method. Background In the field of precision machinery manufacturing and quality detection, the surface roughness of a workpiece is used as an important index for measuring the machining quality, and the assembly performance, the wear resistance and the service life of a product are directly influenced. Along with the continuous improvement of the industrial automation level, higher requirements are put on the efficiency, the precision and the intelligent degree of roughness measurement. In the related art, a stylus method is used for measuring the surface roughness of a workpiece in a contact manner, so that the movement control of the stylus is not accurate enough, and the problems of overlarge contact force or inaccurate contact position are easily caused. If the force is too large, the contact pin is easy to damage, measurement errors are easy to cause, and for parts with curved contact surfaces, if the contact position is inaccurate, the measurement results are easy to be unstable. Disclosure of Invention The application provides a roughness measuring device and a roughness measuring method, which are used for solving the problem that the movement control of a contact pin is not accurate enough. In a first aspect, the application provides a roughness measurement device, which has a first direction, a second direction and a third direction perpendicular to each other, and comprises a tool module, a measurement module and a motion control module, wherein the tool module is used for positioning and fixing a workpiece, the measurement module comprises a first driving mechanism, a mounting seat, a measuring instrument and a camera, the mounting seat is arranged on the first driving mechanism, the camera and the measuring instrument are arranged on the mounting seat, the measuring instrument comprises a contact pin used for contacting the workpiece in the second direction, the first driving mechanism is used for driving the mounting seat to move in the first direction so as to enable the measuring instrument to measure the workpiece, the camera faces the first direction and is used for collecting images of the workpiece, the motion control module comprises a second driving mechanism and a third driving mechanism, and the second driving device is used for driving the tool module and the measurement module to relatively move in the second direction and the third driving device is used for driving the tool module and the measurement module to relatively move in the third direction. The movement control module can drive the contact pin to abut against the part to be detected of the workpiece, the camera is used for collecting and monitoring the image of the workpiece, the coordinate position of the part to be detected can be accurately analyzed, and the real-time distance between the part to be detected and the contact pin is determined, so that the travel of the contact pin is accurately controlled, the accuracy of movement control of the contact pin is improved, the contact pin can contact the part to be detected at a proper speed and can be timely stopped after contact, and the problem caused by overlarge contact force or inaccurate contact position is avoided. In an alternative embodiment, the tool module is disposed on the second driving mechanism, and the measurement module is disposed on the third driving mechanism. The tool module has the beneficial effects that the second driving mechanism and the third driving mechanism are arranged separately, so that the movement of the tool module in the second direction and the movement of the measuring module in the third direction can be performed in parallel without mutual influence, and meanwhile, the inertia force of the tool module in the second direction and the inertia force of the measuring module in the third direction are reduced, and the tool module and the measuring module can be controlled more sensitively. In an alternative embodiment, the measuring module further comprises a blow head provided with a nozzle opening towards the stylus for purging the workpiece and the part of the stylus to be measured. The method has the beneficial effects that through cleaning the part to be measured, the image acquisition and analysis of the camera are facilitated on one hand, and the measurement of roughness is also facilitated to be avoided from being interfered by pollutants on the other hand. In an alternative embodiment, the spout is inclined to the second direction. The device has the beneficial effects that through the inclined arrangement of the nozzles, the pollution carried by the air flow and blown away by the air flow can be prevented from rebounding to the surfaces of the blowing head and the contact pin, and the reliability of blowing is impr