| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of working a glass tube by which the glass tube having uniform thickness, diameter and characteristics is obtained in a working process of the glass tube including a stage for heating the glass tube by a heating source relatively moving to the glass tube. SOLUTION: In the working method of the glass tube for heating to work a part of the glass tube by the heating source moving relatively to the glass tube in the axial direction of glass tube, the diameter and the surface temperature of the glass tube are measured in a plurality of measurement points including softened part of the glass tube by being heated and the inner pressure of the glass tube is adjusted so that a value obtained by multiplying the difference of the diameter between the measured diameter and the set diameter in each measurement point or the difference of the diameter between the measured diameter in each measurement point and the outside diameter of the softened part of the glass tube in the approximate shape by the viscosity of the glass determined from the temperature in the point as a weight and adding the obtained values so as to become zero. COPYRIGHT: (C)2007,JPO&INPIT
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