| Punched technical analysis for Cutting machine |
| Date：2013-10-26 Author：zhaoyang Hits：985 |
| Any kind of CNC cutting machine thermal cutting technology, except in a few cases can start from the outer edge of the board , the board generally must wear a hole. Previously in laser punch press machine is a hole punch out first , and then use a laser to cut from the hole at the beginning . No punching apparatus for laser cutting machine , there are two basic methods of perforation : Blasting perforation Material by continuous laser irradiation to form a pit in the center , and the laser beam is coaxial with the flow of oxygen to remove the molten material quickly form a hole . Average pore size and thickness of the blasting hole half the average diameter of the plate thickness , so the thicker plate blast hole diameter is large, not round , not in the machining of high precision parts used , only with in the waste on . Furthermore, since the pressure of oxygen used for piercing and cutting the same , the larger splash . Pulse perforation Use of high peak power pulsed laser light to melt or vaporize a small amount of material , commonly used as an auxiliary gas is air or nitrogen , to reduce the expansion due to the exothermic oxidation of the hole , the gas pressure is relatively small when cutting oxygen pressure . Each laser pulse jet produced only small particles , gradually deepened , so thick perforated time takes a few seconds . Once the piercing done immediately replaced by oxygen assist gas for cutting. This small diameter hole , the hole quality is better than blasting perforation. The lasers used for this should not only have a high power output ; more important is the time and spatial characteristics of the beam , it is generally cross-flow CO2 laser can not meet the requirements for laser cutting . Moreover pulse perforation must have more reliable pneumatic control system to achieve the type of gas , gas pressure switch and perforation time control. In the case of pulsed perforated , in order to obtain high quality cuts, the pulse from the workpiece stationary perforated continuous cutting of the workpiece constant attention should be paid transition technology . Theoretically usually change the acceleration section of the cutting conditions such as focal length, position of the nozzle , the gas pressure , etc., but in fact such a short time is unlikely to change the above conditions . In industrial production, mainly by changing the average laser power is more realistic way , the specific method is to change the pulse width ; changing the pulse frequency ; while changing the pulse width and frequency . |
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