Laser cladding additive forming online monitoring device and look-ahead-feedback control method

Abstract

The invention discloses a laser cladding additive forming online monitoring device and a look-ahead-feedback control method. The online monitoring device comprises a cladding forming unit, a monitoring unit and a control system unit; the cladding forming unit comprises a laser device, a cladding head and a worktable, the monitoring device comprises a temperature measuring instrument, an image intake unit and a connection frame, the control system unit comprises a program pre-reading unit, a look-ahead control unit, an image processing unit and a feedback control unit; according to the controlmethod, the temperature measuring instrument and the image intake unit are fixed to the laser cladding device to move jointly along with the cladding head, and compared with axis feeding speeds calculated through the interpolation period in the program pre-reading process and the actual scanning line speed of the cladding head, according to the difference value, the laser power is subjected to look-ahead control, through monitoring of molten pool characteristic sizes obtained after pixel treatment of a molten pool image continuously shot by the image intake unit in the laser accumulation process and collecting of the molten pool center temperature collected by the temperature measuring instrument, the laser power is subjected to closed-loop feedback control.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology and precision measurement and control technology, and relates to laser cladding and laser additive manufacturing, in particular to an online monitoring device for laser cladding additive forming and a forward-looking-feedback control method. Background technique [0002] Laser cladding additive forming technology, its geometric feature is three-dimensional assembly and accumulation, and its physical feature is a rapid melting process of local area extension. After layering the CAD model of the entity, under the rapid scanning irradiation of the laser spot, the material follows the path specified by the program to form small molten pools point by point, and the small molten pools are rapidly melted and solidified successively. A single pass is cured one by one to form the final part. [0003] In order to ensure the uniformity and quality of the forming, the laser power output by th...

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Problems solved by technology

[0006] In order to solve the online mismatch problem of the above-mentioned process parameters, the present invention uses forward-looking and online monitoring methods to perform feedback control on laser power, and proposes an online monitoring device for laser cladding and additive forming and a forward-looking-feedback control method. Adjust laser power before and during processing to achieve reasonable matching of process parameters during cladding

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