Glass tube necking and inversion flange and its manufacturing method and equipment

Abstract

A glass tube necking and inversion flange and its production method and equipment. The production method firstly heats and softens the middle of the glass tube twice the length of the glass tube flange, and gradually forms a tapered opening through a forming mold, and forms two A flat flange is turned inward, and at the same time, it is cut off and separated into two glass tube flanges. The production equipment includes forming molds, rollers and heating heads. The advantages of the invention are: the glass tube with the constricted inward flange reduces the diameter of the corresponding Kovar end cap, saving Kovar materials; the manufacturing method can process two workpieces at a time, which improves the production efficiency; the manufacturing equipment structure Simple and easy to implement.

Description

technical field [0001] The invention relates to a glass tube shrinking and inverting flange, a manufacturing method and a manufacturing device thereof, which are used for manufacturing the outer cover glass tube of a metal glass vacuum heat collecting tube. Background technique [0002] The existing metal glass vacuum heat collector tube is composed of a metal heat sink and an outer glass tube. figure 1 , a flat flange 102 must be made at the end of the glass tube 101 . The glass flange 102 can be a glass tube that is turned upside down. The specific manufacturing process is to clamp one end of the glass tube 101 on a glass lathe, heat the other end with a flame, and insert a U-shaped female mold into the tube at the same time. For compression molding, since the U-shaped concave die must move down to exit from the inner hole of the flange when it exits the tube after molding, the diameter of the inner hole of the glass flange cannot be too small, that is, the glass flange c...

AI Technical Summary

Problems solved by technology

The glass flange 102 can be a glass tube turned upside down. The specific manufacturing process is to clamp one end of the glass tube 101 on a glass lathe, heat the other end with a flame, and insert a U-shaped die into the tube at the same time. Compression molding, because the U-shaped die must move down to exit from the inner hole of the flange when it exits the tube after forming, so the diameter of the inner hole of the glass flange cannot be too small, that is, the glass flange cannot be small, and only the glass tube with the same diameter can be made Inverted flanges, the corresponding kovar end caps are larger, and the outer diameter of the glass tube is the same. In addition, the process is low in efficiency in single-piece production, so it is necessary to invent small flanges, which can be produced efficiently

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