Quick phototyping by laser cladding layer height measuring device and closed-loop control method thereof

Abstract

The invention discloses a quick phototyping by laser cladding layer height measuring device and a closed-loop control method thereof. The quick phototyping by laser cladding layer height measuring device comprises three laser 2D (two-dimensional) displacement sensors, a control unit, an upper computer and a display. According to the closed-loop control method, the three laser 2D displacement sensors are spaced at an included angle of 120 degrees and mounted around a cladding bit for measuring the height of the cladding layers on the side lines of a closed laser equilateral triangle around a molten metal bath; every laser 2D displacement sensor is provided with a sensor controller for converting CMOS (complementary metal-oxide-semiconductor) image signals into height data and transmitting the height data to a control unit via an Ethernet network; the control unit is used for processing the data collected by the three laser 2D displacement sensors, computing the height of cladding layer and feeding the height back to the upper computer; the display is used for in real time displaying the height date measured by the three laser 2D displacement sensors and the layer height data processed by the control unit. The quick phototyping by laser cladding layer height measuring device and the closed-loop control method thereof achieves real-time precise control of the single-layer lifting capacity of the cladding bit.

Description

Technical field: [0001] The invention belongs to the fields 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 melts the powder and the surface of the substrate in the focal area to form a molten pool. With the horizontal movement of the cladding head, the molten pool is rapidly cooled and solidified after the laser beam leaves, and a cladding layer with a certain height and width along the direction of the nozzle movement track ...

AI Technical Summary

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

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