Process for the production of a homogeneous ream-free body made of quartz glass

US5443607A · kind A · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Wolfgang Englisch · Kelkheim, DE
• Heinrich Goy · Hasselroth, DE
• Paul Sauerwein · Rodenbach, DE
• Peter Hitzschke · Rodenbach, DE
• Fritz Simmat · Gelnhausen, DE
• Rolf Takke · Hanau, DE
• Gerhard Steiner · Neuenstein, DE

Key dates

• Filing date: Dec 21, 1993
• Grant date: Aug 22, 1995
• Expiry date: Dec 21, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S65/08
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the production of homogeneous ream-free bodies made of quartz glass or made of a glass having a high content of silicic acid, in which an essentially bar-shaped initial body is twisted about its longitudinal axis in a shaping step to form a twisted body radially homogenized in layers having axial layering. To make it possible to produce homogeneous large-volume bodies, in at least one further shaping step the twisted body is then softened in a heatable mold under a force acting in the axial direction to deform it in a direction transverse to its axial direction into the mold and form a glass bar, the longitudinal axis of which extends essentially perpendicular to the layering. The glass bar is then twisted about its longitudinal axis.