Views:5 Author:Site Editor Publish Time: 2019-02-14 Origin:Site
( 1 ) High power transverse flow CO2 laser.
High - power cross-flow CO2 laser is used for laser processing and heat treatment. The whole laser is an integrated box. The upper box body of the box body is provided with an integrated discharge chamber, a heat exchanger, a fan system, an inlet and outlet deflector and an optical resonant cavity, and the lower box body of the box body is provided with a laser power supply, a charging and discharging system, a vacuum pump, a ballast resistor box and a control box. Compared with the prior art, the laser has the characteristics of compact structure, convenient installation, debugging and maintenance, high working efficiency of the laser and miniaturization of the whole machine. It is mainly applied to the welding of diamond tools, automobile gears, automobile airbag gas generators, etc., laser surface quenching and cladding processes and their special applications in the surface melting quenching of steel rolls, surface repair of petrochemical parts, etc.
( 2 ) Acousto - optic Q - switched CO2 laser: In order to meet the application requirements of laser ranging, environmental detection, space communication and the study of interaction mechanism between laser and matter, an acousto-optic Q - switched CO2 laser has been developed. In view of various factors that affect acousto-optic Q - switched CO2: laser output, the main technical parameters of the laser output are theoretically analyzed and calculated by using the Q - switched pulse laser rate equation. A method of acousto-optic Q - switched CO2: laser optimal design is proposed and verified by experiments.
The laser pulse repetition frequency is lHz～50kHz, and the output laser pulse width is 180ns and the peak power is 4062W when lkHz is running, which is basically consistent with the theoretical calculation. The results show that through the optimization of acousto-optic crystal ( AO ) and the reasonable design of resonant cavity. High repetition rate, narrow pulse width and high peak power output of small CO2 lasers can be realized, and wavelength tuning and coding output of such lasers can be realized through a grating line selection design mode and TTL signal control.
( 3 ) Compact long-life RF - excited waveguide CO2 laser: In order to make CO2 laser have more extensive application in industrial processing and military affairs, a compact long-life RF - excited waveguide CO2 laser has been developed by using aluminum alloy drawn profile as the laser casing, disk-mounted inductor instead of traditional wire-wound inductor structure and all-metal sealing process. It can be continuously output or pulsed output at modulation frequency not higher than 20kHz, with a maximum output power of 30W. The measured working life is over 1500h and the storage life is over 1.5a a. The results show that the laser has the characteristics of compact structure, stable output power, long working life, continuous operation and pulse modulation, etc. It can not only satisfy the processing of various materials, but also be applied in military.
( 4 ) New portable CO2 laser: It is a new portable transversely excited atmospheric pressure CO2 laser. The laser is powered by 4 No. 5 rechargeable batteries and can work continuously for 1h at 1Hz repetition rate. The size of the whole laser ( including power supply and control system ) is 200nm×200mm×360mm, and its mass is less than 8kg. The laser uses ultraviolet corona preionization mode, and the discharge is uniform and stable. Under the condition of free oscillation, the laser pulse output energy reaches 35mJ and the output pulse width is 70ns.
( 5 ) High - power continuous CO2 laser: aiming at the problems of cracks and blade deformation caused by continuous laser cladding on turbine blades of helicopter engines, a new power supply control scheme is adopted on a 5kW continuous cross-flow CO2 laser, and pulse laser power output is realized through software and related control. The problems of cost and stability caused by high-power switching power supply are overcome. The pulse modulation frequency can reach 5Hz. The modulation duty ratio can reach 5% ~ 100%. when 4kW peak power, 4Hz pulse repetition frequency and duty ratio are used, the cladding experiment of alloy powder StelliteX-40 is carried out on the K403 composite surface of the engine blade. the results show that the heat affected zone after cladding is reduced by 50% compared with continuous laser, the hardness is increased by 5%, the interfacial bonding property is equivalent to that of the base metal, and there is no cladding crack and blade deformation.
Over the years, China's national science and technology plan has done a lot of digestion and absorption work on axial flow CO2 lasers and cross flow CO2 lasers. Cross - flow CO2 lasers developed by China, the United States, Japan and Russia have low cost and high power, but due to poor beam quality, they are mainly used for remanufacturing and heat treatment. Axial flow CO2 laser developed by Germany has been widely used in laser welding and cutting due to its good beam quality. However, due to the high cost, complicated structure, high maintenance cost and high operation cost of axial-flow CO2 laser, it is difficult for small and medium-sized enterprises to accept it, resulting in slow progress in its popularization and application. Therefore, axial-flow CO2 laser is obviously not the development direction of CO2 laser in China.