PIPE SEAM DETECTION DEVICE OF THREE-DIMENSIONAL LASER BEAM MACHINE

Abstract

The invention provides a device for detecting the position of a seam on a welded pipe in a three-dimensional laser beam machine for processing pipes. The three-dimensional laser beam machine has a chuck 62 for holding, rotating and axially moving a cylindrical pipe 400. A weld seam detection device 100 is equipped with a sensor head 110 provided on a laser processing main body 30. The sensor head 110 has a master lever 120 that moves along an inner wall surface 410 of the cylindrical pipe 400 and a sensor lever 140. When the cylindrical pipe 400 is rotated and the sensor lever 140 contacts the weld seam, the movement of the sensor lever 140 is detected by a micro switch 150, which sends a signal to an NC device 90 by which the weld seam position is recognized.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an explanatory view showing the outline of a three-dimensional laser beam machine to which the present invention is applied;

FIG. 2 is an explanatory view illustrating the details of the area near the processing unit;

FIG. 3 is an explanatory view illustrating the weld seam detection device of the present invention equipped in a laser processing main body;

FIG. 4 is an explanatory view showing the basic principle of a sensor head;

FIG. 5 is a front view of the sensor head;

FIG. 6 is a right side view of FIG. 5;

FIG. 7 is an explanatory view illustrating the process for detecting a seam existing on an inner wall surface of a cylindrical pipe;

FIGS. 8A and 8B are explanatory views illustrating the process for detecting a seam existing on an inner wall surface of a square pipe; and

FIGS. 9A and 9B are explanatory views illustrating the existence of a seam on a welded pipe.

Claims

1. A pipe seam detection device of a three-dimensional laser beam machine comprising: a chuck for holding, rotating and axially moving a pipe;a laser head for subjecting the pipe to three-dimensional laser processing; anda sensor head coming into contact with a seam on an inner wall surface of the pipe to detect the position of the seam on the welded pipe.

2. The pipe seam detection device of a three-dimensional laser beam machine according to claim 1, wherein the pipe seam detection device comprises the sensor head and a means for moving the sensor head up and down; andthe sensor head comprises a sensor lever coming into contact with the seam and a limit switch for detecting the movement of the sensor lever.

3. The pipe seam detection device of a three-dimensional laser beam machine according to claim 1, wherein the sensor head comprises an air nozzle for providing air blow to the portion to be detected.

4. The pipe seam detection device of a three-dimensional laser beam machine according to claim 1, wherein the sensor head is arranged close to a sensor lever, and the sensor head further comprises a lever that moves along the inner wall surface of the pipe in contact therewith.