Apparatus for cutting bead on inner surface of electric-resistance-welded steel pipe

Abstract

Disclosed is an apparatus for cutting a bead on the inner surface of an electric-resistance-welded steel pipe that can cut an inner surface bead in an electric-resistance-welded steel pipe without causing spatter roll-overs on the inner surface. The apparatus comprises: an inner surface cutting mandrel (6) for cutting an inner bead (5) that is generated in an electric-resistance-welded steel pipe manufacturing process, and which is inserted into the interior of the steel pipe near a welding point; and a spatter guide (14) that guides spatters (3) coming in from the welding point to the downstream side of a lower rolling ball (8) of the inner surface cutting mandrel (6), and which is provided in a protruding state on the periphery of the inner surface cutting mandrel (6). Preferably, a scraper (15) should be provided so as to guide spatters falling into the interior of the steel pipe to areas where the lower rolling ball (8) will not roll over. This prevents the lower rolling ball (8) from rolling over spatters in the inner surface. The scraper can be in the shape of a plate or comprise a resin block.

Description

technical field [0001] The present invention relates to an improvement of an inner bead cutting device for an electric-welded steel pipe for cutting an inner bead produced in a manufacturing process of an electric-welded steel pipe. Background technique [0002] The electric resistance welded steel pipe is manufactured by passing a steel strip through a plurality of forming rolls to gradually bend it into a tubular shape in the width direction, and continuously press-welding the end faces thereof. Therefore, a weld bead is formed at the welded joint portion, which not only makes the appearance unattractive, but also causes various problems in terms of the function of the steel pipe. Although the outer bead formed on the outer surface of the steel pipe can be easily removed with a turning tool, compared with this, it is not easy to cut the inner bead formed on the inner surface of the steel pipe. [0003] Therefore, at present, a method has been developed in which an interna...

AI Technical Summary

Problems solved by technology

In this way, even if the inner surface blowing is applied to the pressed welding spatter, the welding spatter cannot be separated from the inner surface of the steel pipe, resulting in a quality problem called poor inner surface pressing

In particular, for cylinder tubes and oil well tubes that require smooth inner surfaces, it is necessary to manually repair them due to the importance of such poor inner surface pressure, which may cause problems due to increased intermediate stocks, delays in delivery, and repairs. cost increase and many other problems

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