Core holding device of rolled steel tube

Abstract

The invention belongs to seamless steel tube hot rolling equipment, relates to a mandrel embracing device for rolling steel tubes, and solves the technical problem of the shake of a mandrel bar and a hollow billet in rolling resulted from the unavailability for positioning a pierced billet effectively of the existing mandrel embrace equipment for rolling steel tubes. The equipment comprises a chassis (1), a hydraulic cylinder (2) with adjustable stroke, and a T-shaped swing arm (5), a first V-shaped swing arm (10), a second V-shaped swing arm (12) and a multi-head swing arm (18) which are connected respectively by three connection rods and distributed in a shape of a downward-pointing triangle; and a fixed mandrel B (13) penetrates through the middle parts of the first V-shaped swing arm (10) and the second V-shaped swing arm (12) one after another and penetrates the two together, and a left wander (25), a middle wander (26) and a right wander (26) of the multi-head swing arm (18) are mutually and fixedly connected and distributed in a shape of sector; the equipment is matched with an assorted translation mechanism, thus realizing the operation for simultaneously shifting the specific work piece into and out of the work piece center line, solving the flapping problem for rolling the work piece and improving production efficiency.

Description

technical field [0001] The invention relates to a hot rolling equipment for seamless steel pipes, in particular to a core holding device for skew rolling of seamless steel pipes Background technique [0002] At present, when rolling seamless steel pipes, the mandrel is penetrated into the capillary, and then sent to the rolling mill for rolling; the rolling methods are mainly full-floating and limiting. The main feature of the full-floating method is that the mandrel floats. It enters the exit table of the rolling mill together with the waste tube, and then performs the circulation of the mandrel such as stripping and cooling. The advantage is that the rolling rhythm is fast, and multiple mandrels are recycled. Less, the disadvantage is that there are many equipment components, and the investment in equipment and workshops is large. The main feature of the limiting method is that the mandrel is limited. It does not enter the exit table of the rolling mill together with the ...

AI Technical Summary

Problems solved by technology

[0003] The invention solves the problem that the existing core-holding device for rolling steel pipes cannot reliably guide the capillary or the mandrel, which causes the violent shaking of the capillary and the mandrel during the rolling process, which affects the stability of the rolling process and the dimensional accuracy and accuracy of the capillary. Surface quality provides a guiding device for steel pipe rolling, which enables the mandrel small cycle rolling process to overcome its limitations, give better play to its advantages, and reduce the investment in equipment and workshops; for improving the production capacity and quality of steel pipes , it is of great significance to reduce engineering investment

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