Method for producing silica glass tube and bore rod body for carrying out said method
A technology of quartz glass tube and quartz glass, which is applied in glass forming, glass reshaping, glass manufacturing equipment, etc. It can solve the problems that the hole is not straight enough, the dimensional stability of the hole diameter cannot meet the requirements, and the drill shaft is easy to bend.
Inactive Publication Date: 2005-12-07
HERAEUS QUARZGLAS
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Problems solved by technology
Furthermore, due to its length, the drill shaft is easily bent, causing the drill to tilt away from the horizontal plane, so the upper part of the drill face is no longer bonded to the quartz glass
In known methods, these also have the effect that the holes are not straight enough and the dimensional stability of the hole diameter cannot meet the requirements
Method used
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[0022] In Fig. 1, reference numeral 1 refers to the whole graphite drill bit. The drill bit 1 basically has a cylindrical shape with a hemispherical 2 contact surface. The hemisphere 2 has a diameter of about 60 mm and is therefore slightly larger than the cylindrical part 3 which has a diameter of 55 mm. The hemisphere 2 and the cylindrical part 3 are integrally formed. The hemisphere 2 is formed with three steps 5 a , 5 b , 5 c which protrude or indent concentrically relative to the longitudinal axis 4 . When viewed from the direction of the longitudinal axis 4, the heights of the steps are 1.6mm, 2.8mm, and 5.5mm in the order of 5a, 5b, and 5c. When viewed transversely to the longitudinal axis 4, each step has a width of 3.5 mm.
[0023] The diameter of the front part 6 of the hemisphere 2 without any steps is 20mm. Inside the cylindrical part 3, an internal thread 7 is formed, which is used to fix the drill bit 1 on the drill shaft (not shown).
[0024] figure 2 A de...
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Abstract
In the known method of making the quartz glass tube (22), the quartz glass cylinder (21) rotating around the rotating shaft line (27) is transferred continuously to the heating zone (24) and a part which begins from one end is softened in the heating zone (24). The quartz glass tube (22) is formed by the enlargement of the softened part (25) toward the upper direction on the drill head (1) of the drill body having the same shaft line with the rotating shaft line. In the present method, to provide a method of making a hollow quartz glass cylinder from a quartz glass cylinder without minimized flaw and having a liner inside hole having stable dimensions, the drill body with the drill head (1) having the convex and curved contacting surface (2), favorably the glove shaped contacting surface (2), which faces to the cylinder (21) is used. According to the invention, the characteristic of the drill body is that the drill head (1) having the convex and curved contacting surface (2).
Description
technical field [0001] The invention relates to a method of producing quartz glass by continuously feeding a cylinder of quartz glass rotating about an axis of rotation to the heating zone, softening the cylinder portion starting at one end in the heating zone, and pulling The softened part covers the drill bit of the drill body which is arranged coaxially with the axis of rotation, whereby the softened part forms a quartz glass tube. [0002] Furthermore, the invention relates to a drill rod body for forming a quartz glass cylinder from a quartz glass cylinder, the drill rod body comprising a drill bit penetrating into the cylinder being machined and supported by a drill shaft. Background technique [0003] A method and apparatus of this type are described in Japanese Patent JP-A3-247525. In the method described in this patent, a solid quartz glass cylinder is formed into a hollow quartz glass cylinder by simultaneously and continuously feeding the solid quartz glass cylin...
Claims
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IPC IPC(8): C03B20/00C03B23/045C03B23/047C03B23/049
CPCC03B23/047C03B23/0496C03B20/00
Inventor D·克尼林R·施莱希
Owner HERAEUS QUARZGLAS