Abstract: A spur gear assembly for axially mounting and supporting an end of a feed screw for each carriage and is driven from the main drive, since these feed screws of each carriage are arranged coaxially along a line parallel to a passline of the pilger mill. This spur gear allows relative rotation of the feed screws in this gear assembly mounting and a similar mounting is provided for the other screws of the pair of screws for each carriage. A first gear unit connected to the main drive causes a reciprocation of the stand along with the two feed carriages, and a second gear unit including a shaft clutch assembly is selectively brought into engagement and disengagement with the spur gear assemblies and the first gear unit to impart rotation to the screws to separately and independently advance and return the feed carriages to their starting position while one of the feed carriages continues to advance the shell through the mill.

Abstract: A cold pilger mill including a rolling mechanism for intermittently rolling a tubular material over a mandrel to a reduced-diameter pipe. A detector is associated with the rolling mechanism for detecting the rolling phase in the rolling mechanism. A feeding mechanism for feeding the material in the axial direction and a turning mechanism for turning the material and the mandrel are respectively provided with their own motors. A controller is also provided to receive a signal from the detector and supply operation signals to the respective motors of the feeding mechanism and the turning mechanism so that these mechanisms are operated at completion of each rolling stroke.

Abstract: The process and the device which are the object of the invention relate to the cold rolling of tubes by means of a Pilger mill. The tube blank is made to advance near each of the upstream and downstream dead centers reached by the roll stand during its forward and return cyclical movement and backward movement of the rear part of the blank is made possible during a return pass of the roll stand. This process makes possible a doubling of production without changing the operating rate of the roll stand.

Abstract: A duct finishing machine is provided and consists of a duct holding frame that engages and holds a duct in a proper position, a power head carriage that pivotally attaches and locks the duct on the duct holding frame and a power head that moves along the power head carriage traveling an entire length of the duct for sealing a formed lock seam of the duct by rolling a flange down tight.

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: A method of producing a continuous metallic tape from a metallic material wire by rolling. A wire having any desired cross-sectional shape is fed into the gap between a pair of rolls in a direction parallel to the axes of the rolls. The rolls are adapted to be reciprocatingly rotated or oscillated through a predetermined angular stroke. Guides are provided at the material wire inlet side and the product tape outlet side for shifting the wire and the tape in a direction perpendicular to the direction of feed reciprocatingly and in synchronism with the rotation of the rolls. Pinch rolls are provided for intermittently feeding the wire, when the latter is out of the area of rolling pressure.

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.

Abstract: An improved method of and apparatus for manufacturing plowshares that enables the plowshare bending and shaping operations to be performed with precision in a succession of reciprocal movements while minimizing the need for preforming or treatment of the material from which the plowshare is made prior to placement in the plowshare machine, which method and apparatus is further characterized by a capability of working sheet material of different thicknesses, and which utilizes hydraulic power cylinders.

Abstract: The invention relates to a taper rolling machine which is designed such that the stock may follow a constant pass line throughout the whole of the taper rolling operation.In particular the taper rolling apparatus comprises a pair of idler rolls (7 and 8) and a carriage (2) for gripping the stock (12) and drawing it through the rolls in a multiplicity of passes whilst the roll gap is controlled to impart the taper, this roll gap being adjusted by movement of only one (8) of the idler rolls. The invention is manifested by the carriage (2) being pivotally mounted at 6 and resiliently supported at its forward end by pneumatic, hydraulic or mechanical spring means--this enables the carriage to move in such a fashion as to maintain the stock at a level by which a constant pass line is secured.

Abstract: Improved zircaloy tubes for PWR reactors are produced by a method and apparatus by controlling spirality, that is, the spiral formation of the wall-thickness eccentricity. In the past, that spiral formation has caused the tubes to bow during use, and the present invention permits the maintenance of that spiral formation to acceptable limits. The hollow or workpiece is positioned upon a cylindrical mandrel and is advanced step-by-step through a work zone between a pair of rolls having grooves which define the work zone. The workpiece is turned through a predetermined angle on the mandrel prior to each rocking cycle. The present invention involves controlling the angle at which the metal working forces are exerted so as to minimize the turning moment or torque effect which results in producing the spiral formation.

Abstract: The method resides in feeding a billet in portions into pilger rolls to be worked therein on a mandrel. The billet being positively turned about the rolling axis both in one direction and in the opposite direction in the course of deformation thereof and in the off-contact time when the billet is not engaged by the rolls.

Abstract: In the process of rolling a tubular billet with a mandrel is displaced in the rolling direction as it is simultaneously rotated about its longitudinal axis. Then a portion of the billet is advanced between the working rolls and is drawn over the mandrel during backward movement of the billet together with the mandrel. During forward movement of the billet with the mandrel, the billet is displaced relative to the mandrel in the same direction for a distance equal to that covered by the billet portion fed into the gap between the working rolls. The backward movement of the billet with the mandrel is effected at a speed substantially close to the peripheral speed of the working rolls at the starting moment of the drafting operation. The pilger mill comprises a stationary stand with continuously rotating working rolls. The mill also incorporates a billet feeding and turning mechanism and a billet gripping jaw kinematically linked with each other.

Abstract: A method of rolling metal billets in a single pass comprises the steps of reducing a billet by workrolls and alternating each reduction cycle of the billet being worked with axial feed thereof through a step of rolling. As the billet is worked by the workrolls a transitional section is formed thereon as a deformation cone having a length along the axis of the billet substantially greater than the corresponding length of the deformation zone induced in the billet by each workroll at each given moment. The mill for carrying out this method comprises a frame having guides running in parallel with the axis of the billet being worked and mounting a roll housing geared to the mill drive to reciprocate the roll housing inside said guides in the course of rolling.

Abstract: A pilgrim step rolling mill in which a carriage for advancing the product be rolled toward the roller cage is driven intermittently in synchronism with the reciprocation of the roller cage by a screw which is both reciprocated axially and continuously rotated. The carriage advances to drive the product only in response to axial movement of the screw in one direction. The overall mill arrangement reduces the number of and extent of the gearing required.

Abstract: A profile plano-type knurling machine relates to metal pressure shaping machinery. It is more expedient to use the present invention for working splined shafts, polygonal parts and gears. In the present knurling machine a device for moving knurl rollers in the radial direction relative to the centers has tapered elements kinematically associated with the knurl rollers and pressure members whereas only one pressure member intended to provide the radial feed of the knurl rollers is installed on the fixed support member at the side of the bases of the tapered elements coaxially to the centers and adapted for actuating simultaneously all the tapered elements through an intermediate part located between said pressure member and the bases of the tapered elements. This technical solution provides for a considerable improvement of the machine efficiency and its reliability in operation as well as processing accuracy of the work pieces being machined.

Abstract: A method for producing zircaloy tubes from hollows or workpieces which are in the form of tubes having greater wall thickness than the finished tubes. The method is carried out upon a mill of the general type known as a McKay rocker which has a stationary tapered mandrel, but the mandrel is cylindrical and is moved with the workpiece.

Abstract: A rolling mill comprising a mill stand which is mounted on a movable stage and in which are mounted grooved mill rolls whose necks are connected with hydraulic drives and gear wheels in mesh with each other. The movable mill stand is provided with at least two pairs of inductors mounted on a bottom-mill separator intermediate of housing braces. The inductors are disposed above and under the continuously cast ingot, referred to hereinafter as a continuous casting, being rolled, on both sides of the mill rolls. The inductors establish in said rolled continuous casting inductive currents which heat said casting, and electromagnetic forces, which create through the inductor bodies pulling-and-pushing forces which are applied to the movable mill stand.

Abstract: The disclosure of the present invention relates to a torque and mass compensating counterweight system employed with the drive of a cold pilger rolling mill. The counterweight is connected directly to the crank by a sliding block, displaceable in a slot provided in the counterweight, in which the counterweight is arranged to reciprocate 90.degree. out of phase with the crank and is arranged in guides to move in a plane parallel to the direction of movement of the mill.

Abstract: A rolling mill comprises a movable mill stand mounted in slideways and accommodating a mill roll unit installed therein on supports, said mill roll unit including housings with grooved mill rolls disposed therein and roll necks which are coupled with hydraulic drives and gear wheels in mesh with each other. The movable mill stand is equipped with two linear cylindrical inductors establishing a travelling magnetic field. Said inductors are mounted on supports coincident with the axis of rolling of a round ingot, referred to hereinafter as a continuous round casting, and are rotatable about said axis of rolling through an angle of at least 90.degree., the mill roll unit being disposed intermediate of said inductors and being fixed rigidly to the end faces of the inductor bodies.

Abstract: A system for incremently and continuously feeding tubes between dies during a prescribed angle of rotation of a crank assembly in a cold pilger mill. As a main motor drives the crank assembly, a servo-motor, receiving a signal from a digital control unit, which receives a signal from a pulsating encoder associated with the main drive, operates to incremently advance a carriage and shell a controlled predetermined distance between the dies. A reversal of the servo-motor returns the carriage to the initial position in preparation to advance another shell.

Abstract: A rolling mill comprising a movable mill stand mounted in slideways and enclosing grooved mill rolls whose necks are coupled with a hydraulic drive and with gear wheels in mesh with each other. A drive for reciprocating said movable mill stand is equipped with at least two linear inductors installed immovably and at least two electrically conductive bars connected rigidly to movable mill stand separators and braces. The bars are adapted to move intermediate of said inductors and have a length exceeding that of said inductors and begin of a value of at the maximum transfer of said movable mill stand. By establishing inductive currents and, hence, electromagnetic forces in the bars, the inductors develop through said bars pulling or pushing forces acting on said movable mill sand sufficient to provide a requisite roll force. The mill roll hydraulic drive is an auxiliary one.

Abstract: A mill using a movable stand with shaped rolls featuring a working portion, with the reversible rotation of the rolls being limited by an angle encompassing the working roll portion. The rolling of an ingot being cast is effected by carrying the stand with the rotating rolls "forward" and "backward".

Abstract: The invention relates to mechanical engineering.The proposed machine comprises parallel stationary crossbars rigidly interconnected by slides and carrying centers for positioning a workpiece. Mounted on the slides, between the stationary crossbars, and adapted for reciprocating motion along the centers' axis is a movable crossbar with a knurling head in whose housing there are provided radial slots, wherein there are installed sliders with knurls, said sliders being movable in said slots by a device comprising self-braking wedges installed in pairs in each radial slot and stops interacting with said wedges, which stops are mounted on the stationary crossbars and being adapted for reciprocating motion.

Abstract: The invention relates to rolling production. A pipe cold-rolling mill comprises a stand which has a housing with longitudinal guides rigidly fixed therein. In said guides a carriage is installed on a pair of backup rolls mounted in the housing. Said carriage is connected via a crank gear with a drive of the mill to effect the reciprocating movement of the carriage in said guides in the process of rolling a pipe. Said carriage also carries a pair of working rolls positioned at both sides of the axis of the pipe to be rolled. Said working rolls interact each with one of the two backup rolls and are, together with the latter, spring-actuated one with respect to the other.

Abstract: A method of shaping the external surface of a metal billet which comprises holding the billet stationary and moving a pair of grooved rolls which are idly rotatably supported over the billet so that the billet passes through a gap between the rolls and guiding the paths of the rolls to provide the billet with the required shape. This method is preferably carried out by apparatus which comprises a pair of grooved rolls which are idly rotatably supported with a gap between them, means for holding the billet stationary, a mechanism for moving the rolls to cause them to pass along a billet held by the holder so that the billet passes through the gap between the rolls, and at least one guide track for each roll for guiding the path of the roll as it is moved by the mechanism. Preferably each grooved roll is supported on a shaft which extends axially beyond the ends of the roll and two runner rolls, each of which runs along a guide track as the grooved roll is moved, are mounted on the ends of the shaft.

Abstract: The invention is directed to a wedge actuating drive for reciprocating cold reducing tube mills. The wedge drive is driven in common with the main crank which reciprocates the roll carriage, so as to be synchronized therewith. Upper and lower roll positioning wedges are arranged to be cyclicly inserted in and withdrawn from roll-closing positions, by means of eccentric drive shaft means associated with each of the wedges, one above and one below the pass line for the workpieces.Indexing drive means is provided for the eccentric shaft means, whereby during continuous rotation of the main drive shaft for the system, the eccentric drive shaft means for the wedges are actuated intermittently, so that wedge actuation occurs, as desired, only during the periods when the crank-driven roll carriage nears the end extremities of its reciprocating stroke.

Abstract: An apparatus for forming an elongated groove and contiguous dam on a member, such as the push plate of a bulldozer blade, comprises a pair of support and guide assemblies defining a space therebetween. The member is fed through the space and a forming roller, rotatably mounted on one of the assemblies, forms the groove and dam on the member.

Abstract: A method envisaging the use of a movable stand with shaped rolls featuring a working portion with the reversible rotation of said rolls being limited by an angle encompassing said working roll portion, and the rolling of an ingot being cast is effected by carrying the stand with the rotating rolls "forward" -- "backward".