A thermal drift measurement method for scanning galvanometer laser processing system
A technology of laser processing and scanning galvanometer, which is applied in the direction of measuring heat, measuring devices, laser welding equipment, etc., can solve the problem that there is no detection method and prediction model that can accurately obtain the relationship between temperature difference and light spot coordinate drift, and process light spot Obvious problems such as coordinate drift
Active Publication Date: 2020-12-25
UNIV OF SHANGHAI FOR SCI & TECH
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After experiments, it is found that the coordinate drift of the processing light spot is more obvious due to temperature changes
[0003] However, in the prior art, there is no detection method and prediction model that can accurately obtain the relationship between the temperature difference and the coordinate drift of the light spot.
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[0041] In order to make the technical means and effects realized by the present invention easy to understand, the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings.
[0042] figure 1It is a schematic diagram of the steps of a thermal drift measurement method used in a scanning galvanometer laser processing system in an embodiment of the present invention.
[0043] Such as figure 1 As shown, this embodiment provides a thermal drift measurement method for a scanning galvanometer laser processing system. The temperature is used as an independent variable, and the processing spot coordinates are taken as a dependent variable. By establishing the temperature difference and the spot coordinate difference A predictive model is used to predict the thermal drift of the scanning galvanometer laser processing system, including the following steps:
[0044] Step 1. Place the optical sensor used to detect the coordinates of ...
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The invention provides a thermal drift measurement method for a scanning galvanometer type laser processing system. The thermal drift is predicted by establishing a prediction model of a temperature difference value and a light spot coordinate difference value. The method comprises the following steps that 1, an optical sensor is placed on a machining face, and temperature sensors are placed on ashell on the left side of an x galvanometer motor, a shell near a y galvanometer motor, an x galvanometer cooling fin, a shell on the right side of the x galvanometer motor and a y galvanometer cooling fin; 2, the light spot coordinate value and the temperature value are recorded every 5 minutes; 3, the relationship between the light spot coordinate difference value and the temperature differencevalue is analyzed; 4, the prediction model of the temperature difference value and the light spot coordinate difference value is established; 5, a linear correlation coefficient of the temperature difference value and the x and y coordinate difference values of the light spot are obtained by calculation; and 6, a residual average value is resolved, and the residual value in the prediction model with the residual average value is replaced to obtain a complete prediction model.
Description
technical field [0001] The invention relates to a method for measuring light point drift for a scanning galvanometer laser processing system, in particular to a method for measuring light spot thermal drift for a scanning galvanometer laser processing system. Background technique [0002] In recent years, double-galvanometer laser scanning processing technology has become more and more popular, with high processing efficiency and good processing accuracy, so this technology is becoming more and more popular. In order to achieve higher processing accuracy, it is necessary to study the scanning galvanometer laser processing system. various distortion errors. Through the analysis and summary, it is found that the obvious errors include the error caused by the nonlinearity of the mapping relationship, the error caused by adding the F-theta focusing lens, the error caused by the offset of the scanning mirror, and the thermal error. After experiments, it is found that the coordin...
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IPC IPC(8): G01B11/00G01K13/00B23K26/70
CPCB23K26/70G01B11/00G01K13/00
Inventor 陈光胜项汉桢
Owner UNIV OF SHANGHAI FOR SCI & TECH