An automated marking method for external tubing clamp position marking

Abstract

This invention discloses an automated marking method for external pipe clamp position markings, relating to the field of marking. The method involves fixing the pipe; selecting the size of a rectangular marking; using the indicator light function of a laser cleaning machine, projecting the selected rectangular marking onto the pipe surface; adjusting the marking position so that the marking length coincides with the position marking width; adjusting the distance between the marking and the laser cleaning machine's output lens to the focal length of the output lens; setting the rotation speed of a chuck or rotatable manipulator and using the chuck or rotatable manipulator to rotate the pipe, while simultaneously starting the laser cleaning machine to emit laser light for cleaning, resulting in two annular position markings; determining if the markings are clear; and using compressed air to clean the marked pipe to remove particles adhering to the pipe surface. This invention solves the problems of unclear, inaccurate, and unstable quality of traditional electrolytic marking and provides a feasible solution for automated marking, facilitating automated production line layout.

Description

Technical Field

[0001] This invention relates to the field of marking, and more particularly to an automated marking method for marking the position of external pipe clamps. Background Technology

[0002] An aero-engine is a highly complex and precise thermodynamic machine that provides the power required for aircraft to fly. It contains a number of external pipelines. In order to lay and fix the external pipelines of the aero-engine, clamps are generally used for assembly. To achieve precise assembly of the clamps and pipelines, the position of the annular clamps needs to be marked on the pipelines.

[0003] Currently, clamp position marking uses electrolytic marking, which requires manual operation and demands high skill levels to obtain high-quality markings. For rotating surfaces like pipelines, automated marking is even more difficult to achieve, failing to meet the automation requirements of production lines. Furthermore, the template and electrolyte for electrolytic marking are difficult to control, easily leading to electrolytic erosion marks in non-marking areas, affecting the accuracy of the position marking. Marking depth is also difficult to control, potentially impacting the pipeline's performance under vibration. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an automated marking method for external pipeline clamp positions, which solves the issues of unclear clamp position markings and the inability to automate electrolytic marking. This significantly improves marking efficiency, reduces the labor intensity of workers, and increases the first-pass yield of external pipeline markings.

[0005] An automated marking method for the location of external pipe clamps includes the following steps:

[0006] Step 1: Secure the tubing; the tubing can be secured using the turntable of the laser cleaning machine or a rotatable robotic arm;

[0007] Step 2: Select the size of the rectangular mark according to the requirements of the position mark; the mark is the rectangular cleaning area of ​​the laser cleaner; the position mark is the annular area formed by rotating the rectangular mark; the width of the rectangular mark is less than one-third of the outer diameter of the pipeline;

[0008] Step 3: Set the process parameters of the laser cleaning machine; the process parameters include power, frequency, spot diameter, overlap rate, line spacing, and scanning speed;

[0009] Step 4: Determine the center position of the clamp on the pipeline, and then determine the positions of the two sides of the clamp based on the width of the clamp;

[0010] The positions printed on both sides are as follows: to Between and to Between, among The center position of the clamp. The width of the clamp. The length of the mark.

[0011] Step 5: Use the indicator light function of the laser cleaning machine to project the selected rectangular mark onto the pipe surface, adjust the mark position so that the mark length coincides with the position mark width, and adjust the distance between the mark and the laser cleaning machine's output lens to the focal length of the output lens.

[0012] Step 6: Set the rotation speed of the turntable or rotatable robot and use the turntable or rotatable robot to drive the pipeline to rotate. At the same time, start the laser cleaning machine to emit laser to clean and obtain two annular position marks; the width of the position mark is the length of the mark.

[0013] The cleaning time for the location imprint is: T t, where T is the cleaning time of the position mark in seconds, t is the cleaning time of the mark; D is the outer diameter of the pipe, and L' is the width of the mark.

[0014] The rotational speed of the turntable or rotatable robotic arm is: rad / s.

[0015] Step 7: Use a monitoring camera to photograph the pipeline, convert the photographed RGB image into a grayscale image, and check whether the grayscale value of the position printed in the grayscale image is the same as the grayscale value of the pipeline. If they are different, the position is clearly printed and proceed to step 8; otherwise, increase the power of the laser cleaning machine and return to step 6.

[0016] Step 8: Use compressed air to clean the marked pipeline and remove particles adhering to the pipeline surface.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1) The innovative method of using laser cleaning to prepare clamp position marks can solve the problems of unclear, inaccurate and unstable quality of the original electrolytic marking.

[0019] 2) Using laser cleaning to prepare clamp position marks provides a feasible solution for automated marking, which facilitates the automated layout of the production line. Attached Figure Description

[0020] Figure 1 This is a flowchart of an automated marking method for external pipe clamp position marking in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the pipe clamp position in an embodiment of the present invention. Detailed Implementation

[0022] Laser cleaning technology refers to the process of using a high-energy laser beam to irradiate the surface of a workpiece, causing dirt, rust, or coatings to evaporate or peel off instantly, thereby achieving cleanliness. Among these methods, laser dry cleaning is the most commonly used and is suitable for cleaning the surfaces of various materials, such as metals, plastics, and ceramics.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] This invention provides an automated marking method for the location of external pipe clamps, such as... Figure 1 As shown, the specific steps are as follows:

[0025] Step 1: Secure the tubing; the tubing can be secured using the turntable of the laser cleaning machine or a rotatable robotic arm;

[0026] Step 2: Select the size of the rectangular mark according to the requirements of the position mark; the mark is the rectangular cleaning area of ​​the laser cleaner; the position mark is the annular area formed by rotating the rectangular mark; the width of the rectangular mark is less than one-third of the outer diameter of the pipeline;

[0027] In this embodiment, the selected rectangular printing rectangle has a length of 3mm and a width of 1mm;

[0028] Step 3: Set the process parameters of the laser cleaning machine; the process parameters include power, frequency, spot diameter, overlap rate, line spacing, and scanning speed;

[0029] In this embodiment, the power is 50-80W, the frequency is 270KHz, the spot diameter is 0.115mm, the overlap rate is 60%, the line spacing is 0.046mm, and the scanning speed is 12420mm / s.

[0030] Step 4: Determine the center position of the clamp on the pipeline, and then determine the positions of the two sides of the clamp based on the width of the clamp;

[0031] The positions printed on both sides are as follows: to Between and to Between, among The center position of the clamp. The width of the clamp. The length of the mark;

[0032] like Figure 2 As shown, after determining the center position of the clamp, based on the width of the clamp, it can be known that the position mark should be located half a clamp position on each side from the center position.

[0033] Step 5: Use the indicator light function of the laser cleaning machine to project the selected rectangular mark onto the pipe surface, adjust the mark position so that the mark length coincides with the position mark width, and adjust the distance between the mark and the laser cleaning machine's output lens to the focal length of the output lens.

[0034] Step 6: Set the rotation speed of the turntable or rotatable robot and use the turntable or rotatable robot to drive the pipeline to rotate. At the same time, start the laser cleaning machine to emit laser to clean and obtain two annular position marks; the width of the position mark is the length of the mark.

[0035] The cleaning time for the location imprint is: T t, where T is the cleaning time of the position mark in seconds, t is the cleaning time of the mark; D is the outer diameter of the pipe, and L' is the width of the mark.

[0036] The rotational speed of the turntable or rotatable robotic arm is: rad / s.

[0037] Based on the aforementioned rotation speed and cleaning time, it can be ensured that a complete position imprint is formed with one full rotation of the pipeline, and the cleaning ends after one full rotation, preventing any area on the pipeline from being cleaned a second time. A position imprint with a width of 3mm is obtained, and the subsequent clamp installation range is within... arrive Within the range;

[0038] Step 7: Use a monitoring camera to photograph the pipeline, convert the photographed RGB image into a grayscale image, and check whether the grayscale value of the position printed in the grayscale image is the same as the grayscale value of the pipeline. If they are different, the position is clearly printed and proceed to step 8; otherwise, increase the power of the laser cleaning machine and return to step 6.

[0039] Step 8: Use compressed air to clean the marked pipeline and remove particles adhering to the pipeline surface.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of patent protection of the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. All equivalent implementations or modifications that do not depart from the scope of the present invention are included within the patent scope of this case.

Claims

1. An automated marking method for external tubing clamp position marking, characterized by, The method comprises the following specific steps: Step 1: fixing the pipeline; Step 2: selecting the size of the rectangular mark according to the requirement of the position mark; the mark is a rectangular cleaning area of the set laser cleaning machine; the position mark is an annular area formed by rotating the rectangular mark; The width of the rectangular mark in step 2 is less than one third of the outer diameter of the pipeline; Step 3: setting the process parameters of the laser cleaning machine; the process parameters include power, frequency, spot diameter, overlap rate, line spacing and scanning speed; Step 4: determining the center position of the clamp on the pipeline, and then determining the positions of the position marks on both sides of the clamp according to the width of the clamp; The positions of the two side position marks in step 4 are respectively: to and to wherein is the center position of the clamp, is the width of the clamp, is the length of the mark; Step 5: using the indication light function of the laser cleaning machine to project the selected rectangular mark onto the surface of the pipeline, adjusting the position of the mark to make the mark length coincide with the width of the position mark, and adjusting the distance between the mark and the light-emitting mirror of the laser cleaning machine to the focal length of the light-emitting mirror; Step 6: setting the rotating speed of the rotary table or the rotatable mechanical arm and using the rotary table or the rotatable mechanical arm to drive the pipeline to rotate, and at the same time starting the laser cleaning machine to emit laser to clean, obtaining two annular position marks; the width of the position mark is the length of the mark; The position mark cleaning time in Step 6 is: T t, wherein T is the position mark cleaning time in seconds, t is the cleaning time of the mark, D is the outer diameter of the pipeline, and L' is the width of the mark; the rotation speed of the turntable or the rotatable mechanical arm in Step 6 is: rad / s, according to the rotation speed of the rotatable mechanical arm and the position mark cleaning time, the pipeline is rotated for one round to form a complete position mark, and the cleaning is completed after one round of rotation, so that a certain position on the pipeline is not cleaned twice. Step 7: using the monitoring camera to take pictures of the pipeline, converting the taken RGB image into a gray scale image, checking whether the gray scale value of the position mark in the gray scale image is the same as the gray scale value of the pipeline, if not, the position mark is clear and step 8 is executed, otherwise, the power of the laser cleaning machine is increased and step 6 is returned; Step 8: using compressed air to clean the pipeline after the mark, removing the particles attached to the surface of the pipeline.

2. A method of automated marking of position of external pipe clips as claimed in claim 1, wherein, The pipeline fixing in step 1 can be realized by the rotary table or the rotatable mechanical arm of the laser cleaning machine.

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