Method for detecting and controlling laser metal forming height on line
A technology of metal forming and height, which is applied in the direction of measuring devices, optical devices, instruments, etc., to achieve the effect of uniform growth of height and smooth surface of laser forming
Inactive Publication Date: 2011-11-16
XI AN JIAOTONG UNIV +1
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Problems solved by technology
[0003] Aiming at the problem of whether the growth height of each layer of the cladding layer is uniform and flat during the laser metal forming process, the present invention provides a method for online detection and control of the cladding layer height, thereby improving the accuracy of laser metal forming
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[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] Such as figure 1 As shown, an online detection and control device for laser metal forming height includes a laser displacement sensor 4 and a laser metal forming system (powder feeder 1, powder divider 2, coaxial powder feed nozzle 3, laser 6, mirror 5 , three-axis motion table 8, substrate 9 and computer numerical control system 7). The laser displacement sensor 4 can not only emit laser light but also receive laser light. The sensor converts the height of the measured cladding layer 10 into a voltage signal, and then the voltage signal is received by the data acquisition card of CNC (Computer Numerical Control System 7). Under the calibration conditions, the linear relationship between the measured voltage and the height is found, and the measured height corresponding to the voltage signal is measured, so as to determine the...
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Abstract
The invention discloses a method for detecting and controlling laser metal forming height on line. The method comprises the following steps of: vertically mounting a laser displacement sensor on a coaxial powder feeding nozzle; ensuring that laser emitted from the sensor is parallel to the laser emitted from a laser device; opening the laser device and performing cladding forming on the substrateby using a computer numerical control system; after a first layer is formed, controlling sensor offset by using the computer numerical control system; moving a detected surface below the sensor; ensuring that the laser emitted from the sensor is reflected by the detected surface and then received and output by a receiver of the sensor; averaging cladding height data by using the computer numerical control system; comparing an average with an ideal single-layer height; if the average is different from the ideal single-layer height, making the increased height of a cladding consistent with the ideal single-layer height by adjusting the power of the laser device; and continuing performing next cladding and height detection until a component is formed to a needed height by cladding, wherein the laser power is adjusted to gradually reduce along with the change of accumulation layers so as to ensure the uniform growth of the height of each layer.
Description
technical field [0001] The invention relates to a method for on-line detection and control of laser metal forming height, which is suitable for laser metal direct forming manufacturing, laser surface cladding and laser surface repair of vulnerable parts and the like. Background technique [0002] Laser metal forming technology is an advanced manufacturing technology developed on the basis of laser cladding combined with rapid prototyping technology. Based on the "discrete-stack" forming principle, first establish the 3D model of the processed parts, then divide the 3D model into a series of 2D planes, plan a reasonable laser scanning path according to the 2D plane outline, and then transform it into a CNC workbench The running instructions of the machine can finally realize the direct forming of metal parts. Compared with general rapid prototyping technology, laser metal forming technology can quickly manufacture complex metal parts that are difficult to manufacture by trad...
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IPC IPC(8): G01B11/02C23C24/10
Inventor 张安峰李涤尘朱刚贤同治强路桥潘卢秉恒
Owner XI AN JIAOTONG UNIV