Hitoshi Hongu

New CO2 laser equipped with high-peak pulse power and high-speed drilling process

The new C02 laser has been developed for the high speed drilling and cutting process for sheet metals up to 16 mm thickness, with low operational costs.The new C02 laser is equipped with the newly developed acoustic filter and solid-state inverter power supply that have the fol lowing features: (1) To keep high quality glow-discharge under the laser gas flow, the acoustic filter has been newly applied to prevent the ripple of the laser gas pressure.Thus it is able to reduce fluctuations of the laser pulse power to within 10%. (2) The solid-state inverter power supply has been developed to make possible high response glow-discharge power.That creates a high peak pulse power, where the height of the laser pulse power is more than 4000w as well as twice cw laser power. The high speed drilling process using the high peak pulse power makes possible a driffing time of 5 secat 16 mm thickness and less than 0.5 sec at 9 mm thickness for mild steel.

Experimental study on ceramics processing by using high-power CO2 laser beam

This paper makes a report on the results of experimental analyses about the relation between drilling performance about alumina ceramics and focusing characteristics, as first step for clarifying of drilling mechanism of ceramics by CO 2 laser. The results are as follows: · (1) When the focal point is set inside of the work, the shape of holes is made 50 to 55% deeper and 10 to 15% smaller than these when the focal point is set outside of the work. (The distance between work surface and focal point is +/-0.2mm.) It seems to be able to concentrate higher energy when the focal point is set inside of the work. · (2) Spot diameter under 95 μm with the focusing angle (7.5-8 degrees) is necessary to make deep holes. was clarified. From this, it seems that to make deep holes does not only need higher energy density, but also need smooth elimination of molten work. The result of these analyses was applied to new scribing system to develop scribing performance. The scribing speed of alumina ceramics was improved by 20%.