Method and apparatus for making cold-pilger-rolled pipe

Inactive Publication Date: 2013-02-21
SMS MEER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028]A preferred approach is finally one where to implement the method according to the invention not only the rolls but also an adjustably disposed rolling mandrel are adjusted so as to counteract deviations in the outside diameter or wall thickness from a specified value and t

Problems solved by technology

Any rapidly occurring dimensional changes may remain undetected with such periodic sampling-type inspections.
Ultimately, production time was lost during each dimensional insp

Method used

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  • Method and apparatus for making cold-pilger-rolled pipe
  • Method and apparatus for making cold-pilger-rolled pipe
  • Method and apparatus for making cold-pilger-rolled pipe

Examples

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second embodiment

[0037]FIG. 3 is a schematic side view of second embodiment of the invention where an adjustment wedge 7a can be moved horizontally in the direction D for shifting the upper roll 4a by electric or hydraulic motors 16 and 17, in order to adjust roll gap S in the desired manner.

[0038]FIG. 4 is a schematic side view of a third embodiment of the invention in which, unlike the first and second embodiments of FIGS. 1 through 3, the lateral movement of adjustment wedge 7a is effected by hydraulic cylinders 18 and 19. In this case as well, the horizontal movement of the adjustment wedge 7a produces vertical movement of the upper work roll 4a and an adjustment of roll gap S in the desired manner.

fourth embodiment

[0039]FIG. 5 shows a fourth embodiment that is variant of the system of FIG. 4 in which a pump 20 driven by a motor 21 controls the flow of oil to the hydraulic cylinders 18 and 19. In a preferred approach, both the pump 20 and the motor 21 are attached in a fixed manner to the roll-stand frame 4 so as to limit to the necessary minimum the installation space of roll stand together with all of its ancillary modules.

[0040]FIG. 6 is a side schematic view of a fourth roll stand according to the invention. A vertically effective hydraulic cylinder 22 functions directly and without the use of adjustment wedges or the like to shift the upper work roll 4a and thereby adjust the roll gap S in the desired manner. The vertical adjustment of the piston inside the hydraulic cylinder 22 is effected by supplying the hydraulic fluid under pressure P from an external source.

fifth embodiment

[0041]FIG. 7 is a schematic side view of the invention. Adjustment of the roll gap S by adjusting the vertical position of the upper work roll 4a is effected here by a spindle 23 that functions as an element supporting the upper work roll 4a. The spindle 23 is vertically fixed in the stand 4 and threaded into a large nut rotatable by a motor 24, and thus effects not only the stepless adjustment of roll gap S by means of the vertical position of work roll 4a but also the fixation of upper work roll 4a in the desired position.

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Abstract

An apparatus for making a cold-pilger-rolled tube has two grooved pilger work rolls rotatable in a roll frame about respective axes to compress a tubular workpiece moving in a travel direction around a mandrel extending in the direction between a nip formed between the grooved rolls and anchored upstream of the nip in a thrust block. An outside diameter of the workpiece is measured downstream in the direction from the rolls as the workpiece passes through the nip, and an actuator engaging one of the rolls relative the other of the rolls shifts it transversely to the travel direction as the workpiece passes through the nip in accordance with the measured outside diameter for maintaining a uniform outside diameter of the workpiece.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the manufacture of tubing. More particularly this invention concerns making cold-pilger-rolled tubes.BACKGROUND OF THE INVENTION[0002]A standard apparatus for making a tube has two grooved pilger rolls rotatable about respective axes to press a tubular metal workpiece moving in a travel direction against a mandrel extending in the direction between a nip formed between the grooved rolls. The mandrel is supported upstream of the nip in a thrust block and has a frustoconically tapered downstream portion extending through the nip so that as the tubular workpiece is compressed against around the mandrel its diameter and wall thickness are conformed to the final desired dimensions. The rolls themselves are each formed with a substantially semicircular groove to impart the desired cylindrical outer surface to the workpiece.[0003]With this system, tubes are typically manufactured to especially stringent size tolerances. Dimension...

Claims

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Application Information

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IPC IPC(8): B21B37/78
CPCB21B21/00B21B38/04B21B38/00
Inventor BAENSCH, MICHAELTHOME, VERENAKREBS, WOLFGANGSCHIEREN, GEORGSTREHLAU, OLIVER
Owner SMS MEER
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