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Laser cladding rapid prototyping layer height measuring device and closed-loop control method

A laser cladding and measurement device technology, applied in the direction of measurement devices, optical devices, instruments, etc., can solve the problems of unstable molten pool images and easy to be blocked, so as to reduce cladding layer defects and make the measurement and control process accurate , The effect of high forming dimensional accuracy

Inactive Publication Date: 2017-10-20
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has a certain degree of accuracy. However, in the application of these two patents, the capture of the melt pool image will be affected by many factors such as material, laser power, scanning speed, and substrate shape.
The molten pool image is not stable and is easily blocked

Method used

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  • Laser cladding rapid prototyping layer height measuring device and closed-loop control method
  • Laser cladding rapid prototyping layer height measuring device and closed-loop control method
  • Laser cladding rapid prototyping layer height measuring device and closed-loop control method

Examples

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Embodiment

[0042] Example: Laser cladding forming build-up of a curved thin-walled part.

[0043] Set the laser power to 600W, the scanning speed of the cladding head to 6mm / s, the carrier gas flow rate of the powder feeder to 3L / min, the powder feeding rate to 7.5g / min, and the protective air pressure to 1.5bar. Adjust the defocus of the cladding head to -3mm, so that the spot diameter is 2.5mm. There is only one scanning direction. Using the laser cladding rapid prototyping layer height measuring device and closed-loop control method of the present invention, one side of the laser equilateral triangle is perpendicular to the scanning direction. The sampling frequency of the sensor is set to 1000Hz, and the side length of the laser equilateral triangle is 12mm. The 10 points of the measured highest point area are in the middle of the C vector, at C 350 -C 420 between. The defocus amount is stabilized at about -3mm by the closed-loop control method. The surface of the formed part ob...

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Abstract

The invention discloses a laser cladding rapid prototyping layer height measurement device and a closed-loop control method. The measurement device includes three laser 2D displacement sensors, a control unit, a host computer and a display; in the closed-loop control method, the three laser 2D displacement sensors The sensors form an angle of 120° with each other and are installed around the cladding head to measure the cladding layer height on the closed laser equilateral triangle edge around the molten metal pool; and each laser 2D displacement sensor is equipped with a sensor controller , used to convert the CMOS image signal on it into height data, and transmit it to the control unit through Ethernet; the control unit is used to process the data collected by three laser 2D displacement sensors, calculate the cladding layer height value and feed it back to the host machine; display, used to display the height data measured by the three laser 2D displacement sensors in real time and the layer height data processed by the control unit. The invention realizes the real-time and precise control of the lifting amount of a single layer of the cladding head.

Description

Technical field: [0001] The invention belongs to the field of precision measurement and control technology and advanced manufacturing technology, and relates to laser cladding and laser rapid prototyping, in particular to a laser cladding rapid prototyping layer height measuring device and a closed-loop control method. Background technique: [0002] In the laser cladding technology, there is a synchronous feeding forming technology. The principle is to use the cladding head to adjust the high-energy laser beam spot to focus on the metal substrate, and the powder feeding tube continuously transports the metal powder to the laser focus to couple with it. The laser partially melts the powder and the substrate surface in the focal area to form a molten pool. With the horizontal movement of the cladding head, the molten pool cools and solidifies rapidly after the laser beam leaves, and forms a cladding layer on the substrate with a certain height and width along the direction of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/06
Inventor 石拓魏正英卢秉恒王吉洁王伊卿
Owner XI AN JIAOTONG UNIV
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