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An automatic focusing device for laser processing

A laser processing and auto-focusing technology, applied in laser welding equipment, metal processing equipment, installation, etc., can solve the problems of limited application range, complex structure, large precision error, etc., and achieve wide application range, high detection accuracy and stability good sex effect

Active Publication Date: 2014-10-29
武汉飞能达激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, capacitive or inductive sensors can only be used in laser processing of metal workpieces, and cannot be used in laser processing of non-metallic workpieces, thus limiting the scope of application, and the structure is complex and the price is high
The contact sensor has the disadvantages of large accuracy error and easy damage to the functional film covered by the processed surface, and the contact is easy to wear and affect the accuracy, and the response frequency is not very high.

Method used

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  • An automatic focusing device for laser processing
  • An automatic focusing device for laser processing
  • An automatic focusing device for laser processing

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] When the processing laser focus point 4 deviates downward from the surface of the workpiece 8 h for some reason 1 distance (eg figure 2 ), the distance between the laser displacement detection system and the workpiece surface becomes shorter, and the angle between the reflected laser line 6 and the detection laser beam 5 increases as 1 , and pass through the lens 12 to focus and image the light spot on the light collector and move downward from a to e. At this time, the laser displacement detection system 7 will output a negative voltage or current signal with a certain amplitude to the control system 9, and the amplitude is linearly proportional to the offset distance of the laser focus point 4 . The control system 9 adjusts the Z-axis moving system 1 to move upward according to the sign and amplitude of the input signal of the laser displacement detection system 7, and the distance between the laser displacement detection system and the surface of the workpiece also...

example 2

[0025] When the processing laser focus point 4 deviates upward from the surface of the workpiece 8 h for some reason 2 distance (eg image 3 ), the distance between the laser displacement detection system and the workpiece surface becomes longer, and the angle between the reflected laser line 6 and the detection laser beam 5 decreases to 2, and pass through the lens 12 to focus and image the spot on the light collector and move downward from a to f. At this time, the laser displacement detection system 7 will output a positive voltage or current signal of a certain amplitude to the control system 9, the amplitude The magnitude of the value is linearly proportional to the offset distance of the industrial laser focus point 4. The control system 9 adjusts the Z-axis moving system 1 to move downward according to the sign and amplitude of the input signal of the laser displacement detection system 7, and the distance between the laser displacement detection system and the workpie...

example 3

[0028] When the processing laser focus point 4 deviates downward from the surface h of the curved workpiece 9 for some reason 3 distance (eg Figure 5 ), the distance between the laser displacement detection system and the workpiece surface becomes shorter, and the angle between the reflected laser line 6 and the detection laser beam 5 increases to δ 1 , and pass through the lens 12 to focus and image the light spot on the light collector and move downward from a to d. At this time, the laser displacement detection system 7 will output a negative voltage or current signal with a certain amplitude to the control system 9, and the amplitude is linearly proportional to the offset distance of the industrial laser focus point 4 . The control system 9 adjusts the Z-axis moving system 1 to move upward according to the sign and amplitude of the input signal of the laser displacement detection system 7, and the distance between the laser displacement detection system and the workpiece...

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Abstract

The invention discloses an automatic focusing adjustor for laser processing, comprising a Z-axis mobile system, a laser focusing system, a control system and a laser displacement detection system. The control system and the Z-axis mobile system are connected electrically with the laser displacement detection system. The laser displacement detection system is in rigid connection with the laser focusing system. The laser displacement detection system and the laser focusing system are fixed on the Z-axis mobile system and move up and down along the Z-axis direction with the Z-axis mobile system. The control controls the displacement of the Z-axis mobile system according to the symbol and amplitude of an electrical signal provided by the laser displacement detection system. The invention has the advantages that the automatic focusing adjustor for laser processing is not limited by the properties of materials (both metal and nonmetal can be applied), and has wide range of application; is not limited by the surface condition of the materials due to non-contact measurement and does not damage the surfaces of the materials; has high detection precision (reaching nanoscale precision) and can be used for high precision application of nannoscale laser automatic focusing; and has a simple structure, low cost and good stability.

Description

technical field [0001] The invention belongs to the technical field of laser processing applications, and in particular relates to an automatic focusing device for laser processing. Background technique [0002] In laser processing applications, the laser beam used for processing focuses the laser beam into a smaller spot through an optical focusing system to obtain extremely high power density or energy density so that the material is heated, melted or evaporated to achieve the desired processing application Functions (such as processing applications such as laser heat treatment, cladding, welding, cutting, drilling and etching). At the same time, the advantages of small laser focusable size are used to achieve high-precision dimensional processing. However, in the process of laser processing, the uneven surface of the processed workpiece itself, the thermal deformation of the processed space and the fluctuation of the focused laser beam trajectory will cause the deviation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/28B23K26/046
Inventor 段军李祥友王泽敏胡乾午曾晓雁
Owner 武汉飞能达激光技术有限公司