Glass mat for hot extrusion of large-diameter steel pipe and its manufacturing method

Abstract

The invention relates to the technical field of metal hot extrusion, and provides a glass gasket for hot extrusion of a large-caliber steel pipe and a manufacturing method thereof. The glass gasket comprises a plurality of layers glass layer units which are sequentially overlapped along the axis direction of a central hole of the glass gasket, and the preset melting temperature corresponding to the plurality of layer glass layer units rises gradient from the two ends to the middle. According to the glass gasket for hot extrusion of the large-caliber steel pipe and the manufacturing method thereof, the glass gasket is divided into the plurality of layers glass layer units in which the preset melting temperature rises gradient from the two ends to the middle respectively, and corresponds tothe change trend of the temperature of the contact area of the glass gasket and a blank in the extrusion process, so that a glass lubricating film between the blank and the mold can be kept in an ideal thickness in the whole extruding process; the defect that the surface of the steel pipe is generated due to insufficient melting of the glass or too thick the glass lubricating film is avoided, theoverall quality of the steel pipe is improved, the friction condition is improved, the loss degree of the mold is reduced, and the breaking extrusion force and the ending pressure are reduced.

Description

technical field [0001] The invention relates to the technical field of metal hot extrusion, in particular to a glass mat for hot extrusion of large-diameter steel pipes and a manufacturing method thereof. Background technique [0002] The extrusion process means that the metal billet is put into the extrusion cylinder, the extrusion shaft moves at a certain speed, and the metal is forced to be extruded from the die hole at the front end of the extrusion cylinder under strong pressure to obtain an extrusion. When the pipe is extruded, an annular die hole is formed between the extrusion die and the mandrel, and the billet flows out of the ring die hole under the push of the extrusion shaft. The inner diameter of the pipe is determined by the extrusion mandrel, while the outer diameter is determined by the extrusion The sizing zone of the die is determined, and finally an extruded pipe of a certain size can be obtained. [0003] The hot extrusion of steel pipes is generally ca...

AI Technical Summary

Problems solved by technology

[0006] The embodiments of the present invention provide a glass mat for hot extrusion of large-diameter steel pipes and a manufacturing method thereof, in order to solve the problem of insufficient or too fast melting of the glass caused by the use of homogeneous glass in the existing glass mat, and improve the lubrication conditions. So as to improve the overall quality of the steel pipe, reduce the breakthrough extrusion force and end pressure, and reduce the loss of the mold

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