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    • 3. 发明专利
    • Method and apparatus for cutting a laminate consisting of a brittle material and a plastic
    • DE19851353C1
    • 1999-10-07
    • DE19851353
    • 1998-11-06
    • SCHOTT GLAS
    • HABECK ANDREASBUERKLE ROLANDOTTO THORSTENSCHERER OLIVER
    • B26D3/00B26D7/10C03B33/023C03B33/07C03B33/10B23K26/00
    • The method involves preliminary heating of the plastic at least in the zone of the cutting line to reduce its viscosity. The method involves the following steps: a) the plastic is heated at least in the zone of the cutting line to lower its viscosity; b) the cutting tool is placed on the plastic side of the laminate, with the force of the tool adjustable on the laminate surface: c) a relative motion is produced between the tool and the laminate along the cutting line, the plastic is cut through and the surface of the brittle material is grazed to induce a mechanical stress; d) if necessary, the mechanical stress along the cutting line. The claimed apparatus incorporates means for implementing these steps. Preferred Features: Heating takes place by means of radiation (in particular, infrared or laser radiation), or by means of a hot gas jet. Heating takes place by means of a heated cutting tool. The entire laminate can be heated. The laminate is cut by means of a diamond tip of a cutting tool. Alternatively it is cut by a cutting wheel or a blade made of a hard alloy or a ceramic, in particular, tungsten carbide or a sinter metal containing diamond particles. The cutting tool performs ultrasonic oscillations with amplitudes of 5-40 mu m, at frequencies between 20 kHz and 100 kHz. The plastic is a polyethylene foil 1-300 mu m thick, while the brittle material is glass, a glass-ceramic or a ceramic with a thickness up to 30 mm. Alternatively the brittle material takes the form of a foil 10-300 mu m thick. The plastic and the brittle material are joined by means of an adhesive layer 2-50 mu m thick. The plastic material can be applied to the brittle material by other processes such as, for example, casting and spraying. The apparatus includes a piezoelectric or magnetostrictive modulator for production of ultrasonic oscillatory motion of the cutting tool. The cutting tool is pivotable about two axes.