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The section bar escutcheon is the basic mark of steel products. It contains the name of the manufacturer, material quality, standard, production date and serial number of product, which are used for recognizing the bar in the process of using, transporting and marketing it. The marking method existed cannot meet practical requirements of preserving the escutcheon for a long time. As a result of researching in this field, the author has worked out anew method of marking and invented a laser marker of the section bar escutcheon. It is a computer-controlled integrated system composed of a club-shaped Nd-doped yttrium aluminum garnet (Nd3$plu:YAG) solid laser (Kr light pump), a continuous solid laser power source, an optical scanning system, a controlling computer and a cooling system. The optical scanning system guides the output laser beam to the surface of escutcheon blank by using a special controlling system with a mechanism called the planar large pitch ball-leading screw, driven by a stepping moto. Each escutcheon blank will be sent to the pointed location of the focus plane by a pneumatic deferent mechanism composed of tow cylinders. Alternative operation of two cylinders will respectively complete the input of the aluminum escutcheon blank and output of the aluminum escutcheon. The rat cage industrial controlling computer has been applied. Apart from controlling the work of hardware and alarms, this system has many other functions such as recording, processing, transferring, inquiring the product data through a network; recording, reporting the time interval of production break or stop. The data such as the temperature, water, electricity and gas supplies at the site of marking will also be recorded. The prerequisite of running such a laser marker is that the cooling system must work well. For that reason, a hydraulic pressure annunciator has been integrated into this system.
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