Characteristics of fiber laser cutting machine construction
The characteristics of the key mechanism of the machine tool of the fiber laser cutting machine: 3.1 The active clamp adopts the design scheme of the electric chuck. The cutting head is controlled by the numerical control system as the core component of the laser cutting system. It designs a special large-aperture electric chuck. The pipe is 'clamped' and 'relaxed' to ensure the positioning accuracy and at the same time realize the operation of workpieces with different pipe diameters. Eliminates the inconvenience caused by replacing the clamping block of the pneumatic chuck, and can easily adjust the clamping force. At the same time, it eliminates the impact of the vibration generated when the pneumatic chuck is clamped and loosened on the cutting quality. It is more suitable for various types of pipe processing. The actual production requirements. 3.2 Whether the cutting head is reasonable or not directly affects the quality of laser cutting. The cutting heads of foreign laser cutting machines mostly use capacitive non-contact sensor control methods, which are expensive, and there is no finalized product in China. For this reason, this design adopts the low-cost domestic differential transformer displacement sensor control method. 3.3 Air cooling device It is worth mentioning that a specially designed auxiliary air cooling device is used on the cutting head of this equipment. When the pipe is cut (especially for the pipe with small diameter), most of the heat generated by the cutting of the slag attached to the inner wall of the pipe is absorbed by the workpiece. When the cutting density is high, the pipe will overheat and seriously affect the quality of the cut It can't even be cut.
For this design, the fiber laser cutting machine adopts an auxiliary lateral blowing cooling method (as shown in Figure 4). The forced cooling of compressed air effectively solves the problems encountered in actual production. One problem is to achieve high-quality cutting of dense graphics. In order to solve the problem of 'overheating' in similar equipment abroad, the method of increasing the oxygen pressure (7~8Mpa) is adopted. And this machine only needs 1.2Mpa oxygen pressure. Greatly reduce the operating cost of the equipment. 3.4 Light guide system The light guide system consists of a total mirror 1 (optical isolator), a circularly polarized mirror 2 and a focusing lens 3 (as shown in Figure 5). The reflector 1 has the function of preventing the reflected light of the workpiece 4 or other components in the optical path from returning to the laser, causing damage to the laser. The circularly polarized reflector 2 and the focusing lens 3 together form an optical lens group that moves along the machine tool rail. Because the machine tool adopts a multi-section reciprocating cutting method, the single-pass cutting length is 1000mm, that is, the larger optical path difference is 1000mm, so there is no need for beam collimation.