Curved surface laser beam heat treatment device and method for controlling position of laser spot

Abstract

The invention relates to a curved surface laser beam heat treatment device and a method for controlling position of a laser spot. The machine tool host comprises a base, a rotating shaft A installed on the base, a first swing arm and a second swing arm, wherein one end of the first swing arm is connected with the rotating shaft A, and the other end is connected with the second swing arm through a rotating shaft B; the other end of the second swing arm is connected with a laser device through a rotating shaft C; a slideway is parallel to the axial direction of the rotating shafts A, B and C; and a laser device emitter is perpendicular to the surface of the workpiece. The method is implemented by calculating angular speeds of the rotating shafts A, B and C by using a computer language program, wherein the angular speed of the rotating shaft C is firstly calculated, and the angular speeds of the rotating shaft A and B are calculated through a tri-link Jacobi matrix, thereby implementing control of the real-time speed of the laser spot. The method can implement continuous quenching of the convex curved surface, and can also implement the laser quenching technique on the concave curved surface of which the curvature radius is greater than or equal to the distance between the laser head and curved surface.

Description

technical field [0001] The invention belongs to the field of laser heat treatment, and in particular relates to a laser heat treatment device for a workpiece curved surface on a four-axis three-linkage laser processing machine tool and a method for controlling the position and attitude of a laser spot. Background technique [0002] Laser heat treatment refers to the use of a high-energy laser beam to quickly scan the workpiece, and the workpiece is instantly self-cooled and quenched, so that the high-temperature austenite formed by laser heating is transformed into martensite, and laser transformation hardening is realized. The existing laser processing numerical control system, due to the problem of the control machine algorithm, can only process the workpiece with a simple plane or cylindrical surface, and cannot perform laser heat treatment on the workpiece with other curved surface contours. [0003] In the Chinese non-patent literature, Liu Zhongbo published a paper tit...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of laser heat treatment of curved surfaces, and provide a device for laser heat treatment on curved surfaces of workpieces and a method for controlling the position and posture of laser spots by using the device. The present invention can not only realize continuous quenching of convex curved surfaces, but also For concave curved surfaces whose curvature radius is greater than or equal to the distance from the laser head to the curved surface, the laser quenching process can also be realized

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