Abstract: The invention concerns a drive system (1) for a rolling mill, especially for a cold pilger rolling mill with at least one roll frame (1) movable back and forth, at least one crank drive (3) which has a crank arm (4) with a counterweight (5) for at least partial compensation of the inertial forces produced by the mill frame (2), a drive (6) and a connecting rod (7) which articulates the mill frame (2) and the crank arm (4) with one another and at least one counterweight (8, 9) which is eccentrically rotatable and serves to compensate the inertial forces and/or the moments of inertia. To achieve an efficient balancing of the inertial forces with a simple construction of the drive system, the invention provides that at least one counterweight (8, 9) is rotatably driven by a separate rod (10, 11) independently from the drive (6) of the crank drive.

Abstract: The invention concerns a drive system (1) for a rolling mill, especially for a cold pilger rolling mill with at least one roll frame (1) movable back and forth, at least one crank drive (3) which has a crank arm (4) with a counterweight (5) for at least partial compensation of the inertial forces produced by the mill frame (2), a drive (6) and a connecting rod (7) which articulates the mill frame (2) and the crank arm (4) with one another and at least one counterweight (8, 9) which is eccentrically rotatable and serves to compensate the inertial forces and/or the moments of inertia. To achieve an efficient balancing of the inertial forces with a simple construction of the drive system, the invention provides that at least one counterweight (8, 9) is rotatably driven by a separate rod (10, 11) independently from the drive (6) of the crank drive.

Abstract: In a method for adjusting a rolling curve of drive pinions of ring rollers to a neutral zone within a tapering portion of a roll pass of the ring rollers of a cold pilger rolling mill, circular pinions are arranged and secured eccentrically on a roller axis of the ring roller. The circular pinions are driven by sine-shaped tooth racks.

Abstract: A cold pilger rolling tool for producing internally ribbed tubes uses a cold pilger step rolling process in a rolling stand that is movable back and forth in a direction of rolling and has rolls of a tapered design. The rolls of the stand roll along a material with an alternating direction of rotation. The tool includes a cold pilger rolling mandrel which tapers. The tool further comprises an extension plug mounted coaxially and rotatably at a free end of the cold pilger rolling mandrel and in which a negative of the helical internal ribbing which is to be produced is machined.

Abstract: Disclosed is a process and apparatus for producing metal-sheathed strands, especially glass fiber cables, from a metal strip that is first formed into a U-shaped profile and then, after the placement therein of a non-ductile or slightly ductile core material, is closed to form a split tube carrying and/or protecting the core material, which split tube, after the welding of its longitudinal seam, is reduced in a subsequent deformation step. In the process of the invention, the metal-sheathed strand with the welded longitudinal seam is cold-formed in a stretch-reducing fashion in multiple continuous sequential steps. In the apparatus for implementing the process, multiple speed-controlled roll stands of a stretch-reducing cold rolling mill with declining caliber cross-sections are arranged one behind the other directly after the longitudinal seam welding machine for the split tube for the reductive deformation of the metal sheath.

Abstract: A method and apparatus for continuously feeding rolling stock through a cold pilger rolling mill. A rolling stock--either a continuous or so-called "endless" piece, or a plurality of serially fed, spaced-apart pieces--is initially fed into a roll stand by a feed side drive or transporting arrangement, and thereafter, drawn through the rolling mill by a delivery side drive or transporting arrangement that is located in a rolling direction, i.e. downstream, from the feed side drive arrangement. Once the leading free end of the rolling stock is grasped by the delivery side transporting arrangement, the feed side transporting arrangement ceases to feed the rolling stock through the rolling mill, i.e. forward feeding of the rolling stock is exclusively controlled by the delivery side transporting arrangement.

Abstract: Disclosed are a method and apparatus for manufacturing tubes, preferably tubes composed of high-tensile steels or special alloys, using the cold pilger rolling method with two rolling stands which can be moved backward and forward, at least in opposite directions at times and in the rolling direction by means of crank drives. The rolling stands have rollers which are calibrated in a tapering manner and which, driven by toothed racks via cogs, roll over the material to be rolled, with an alternating rotation direction. The majority of the forming work takes place on the first rolling stand and a relatively small portion of the forming work takes place on the second rolling stand and additional smoothing work is carried out.

Abstract: A process for rolling tubes, in which two grooved rolls mounted opposite one another in a roll stand are moved back and forth, i.e., reciprocated, on tube-shaped rolling material, which is arranged on a tapered rolling mandrel supported in the axial direction by a mandrel bar. The rotary-driven rolls have, on their circumferential surfaces, narrowing work grooves matching in shape to the tapered rolling mandrel, which roll down the rolling material on the rolling mandrel. At the ends of the work passes the rolls release the rolling material at the two dead centers of the roll stand path so as to assist in the advancement and rotation of the rolling material. According to the invention, the tube-shaped rolling material and the rolling mandrel are driven asynchronously in the same rotational direction at different rotational speeds.

Abstract: A process for drawing stretched metal workpieces, especially tubes, for the purpose of cross-sectional reduction in more than one drawing step using at least two sequential drawing aggregates. The aggregates grip the workpiece on the outer periphery, with two alternately-moved clamping carriages, which draw the workpiece continuously through respective drawing rings associated with the respective aggregates and arranged in respective drawing-ring holders. The drawing aggregates can be driven independently of one another in a power-regulated and/or moment-regulated manner. Furthermore, during the drawing process, a defined prestress force, which prevents deflection of the workpieces from a straight line, is maintained at all times in the section of the workpiece located between the drawing aggregates.

Abstract: A method of making tubing includes cold pilgrim step rolling wherein particularly a frame moves back and fourth carrying tapering rolls which roll in alternating directions upon the stock to be rolled whereby in addition a cylindrical mandrel is provided as well as turning and advancing facilities for the tube or pipe to be made and with further utilization of a rotatably driven clamping and holding device downstream for extracting the tubes or pipes being made.

Abstract: A method of pilgrim step rolling of elongated stock includes reciprocating a roll stand or frame for moving the stock either by rotating it and/or advancing it; such a method is improved by providing a first component of movement at a constant speed and adding thereto, near each dead center portion of the reciprocating frame movement, a second component of motion including temporary accelerating and decelerating periods.

Abstract: A method and apparatus for manufacturing seamless metal tubes by the cold pilger process permitting the continuous feeding of fresh cooling and lubricating agent between the mandrel and inner surface of the material being rolled. The apparatus includes a roll stand including tapering calibrated rolls (2) which is reciprocatingly movable in the direction of rolling at a predetermined stroke to define a reduction zone, the rolls (2) rolling with alternating direction of rotation over the material (3) being rolled and a tapering mandrel (1) inside the material for reducing the diameter and wall thickness of the material, wherein at least one of the rolls (2) and the mandrel (1) has a surface discontinuity within the reduction zone for creating a zone of interruption (6) or an annular gap within which no contact occurs between the material to be rolled (3) and the mandrel (1).

Abstract: Molten metal is sprayed onto a rotational mandrel which oscillates axially and an axial translatory extraction motion is superimposed for removing the built-up hollow from the mandrel.

Abstract: The present invention relates to a cold pilger rolling mill and a method and means for manufacturing tubes with externally and/or internally thickened portions by reducing the tubes over a mandrel by means of grooved rolls which are mounted in a reciprocating roll stand. The invention provides several different varying diameter grooves on the rolls, which grooves can be brought into play one after the other by rotation of the rolls through an adjustment of the toothed racks on which the rolls are mounted. Consequently, at least one groove is provided for the rolling out of the required cross-section of most of the tube and a second groove is provided for the rolling of a thickened portion of the tube. It is essential that a smoothing zone is associated with each groove, and a zone for rotating and advancing the tube is associated with at least one of the grooves.

Abstract: The disclosure of the present invention relates to a compensating counterweight system used in a cold pilger step-by-step type seamless tube rolling mill reciprocated by a crank assembly. The crank assembly includes first and second compensating mass devices which are arranged to rotate coaxially on a single crank shaft in opposite directions relative to each other. The two mass devices are kinetically connected through a bevel gear drive set which causes the second compensating mass device to rotate in an opposite directon to the first compensating mass device.