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| Number | Title | Issue Date |
| 7296450 | Apparatus and method for production of tapered steel pipe A production apparatus for a tapered steel pipe which holds the two ends of the steel pipe by shafts on carriers and moves it in the axial direction while rotating it to draw it to a taper by an intermediate working roll, wherein the shaft of the working roll is inc... | 11/20/2007 |
| 7146835 | Method and apparatus to reduce slot width in tubular members An apparatus and method are provided for reducing the width of a plurality of longitudinal slots or other openings spaced circumferentially around a slotted tubular member. The invention includes a seaming roller positioned to contact the outer surface of the slotte... | 12/12/2006 |
| 7069657 | Method to reduce the width of a slot in a pipe or tube A method for reducing the width of slots spaced about the surface of a pipe or tube. The method comprises subjecting the surface of the pipe or tube to bombardment by a quantity of shot of a pre-determined size and for a pre-determined length of time to cause deform... | 07/04/2006 |
| 7065996 | Rolling die for ball screw A rolling die for a ball screw has: a cylindrical portion including a helical protrusion formed in an outer peripheral surface thereof for forming a helical ball groove in a raw material of a screw shaft of the ball screw; and a conical lead-in portion formed in one... | 06/27/2006 |
| 7024899 | Roll assembly for a rolling mill A roll shaft assembly especially for a planetary cross roll rolling mill for tubing and the like has the roll shaft and mill roll connected by a conical centering arrangement and a screw, preferably coaxial therewith with the torque transfer being effected by tooth ... | 04/11/2006 |
| 6968719 | Apparatus and methods for forming internally and externally textured tubing A machine may produce a tube having textured internal and external surfaces in a single operation. Inner and outer knurling tools may form the textured surfaces. The texturing of the internal and external surfaces may be helical patterns of ribs and grooves. The hei... | 11/29/2005 |
| 6939419 | Method for producing axially symmetric parts and the article The invention relates to plastic metal working, more specifically to methods for producing parts of the disk- or shell-type having conical, hemispherical, and also combined parts, such as disk-and-shaft ones. The invention is instrumental in producing large axially ... | 09/06/2005 |
| 6904779 | Method of manufacturing a heat exchanger tube with parallel fins A method of forming a finned tube in which the fins are planar, paralleled and extend radially to the tube longitudinal axis, including the steps of positioning at least one rotating forming roll against the tube exterior surface, the forming roll being spaced from ... | 06/14/2005 |
| 6826940 | Method of metal and alloy billet treatment This method refers to a method by which the physical and mechanical properties intrinsic to a fine-grain structure may be formed in metal billets using pressure treatment. The method is designed to treat rods, bars and other particularly long billets. This method is... | 12/07/2004 |
| 6786072 | Method of fabricating a heat exchanger tube A metallic heat transfer tube, in particular for the evaporation of liquids from pure substances or mixtures on the outside of the tube. Fins are integrally formed on the outside of the tube. Recesses are arranged in the area of the base of the primary grooves and e... | 09/07/2004 |
| 6718809 | Method for processing billets out of metals and alloys and the article This method refers to a method by which the physical and mechanical properties intrinsic to a fine-grain structure may be formed in metal billets using pressure treatment. The method is designed to treat rods, bars and other particularly long billets. This method is... | 04/13/2004 |
| 6442988 | Methods of spin forming initially cylindrical containers and the like A method of spin forming an open-ended container or other cylindrical metal workpiece by inserting a conically tapering mandrel coaxially therein and pressing the side wall of the workpiece against the inserted mandrel with plural symmetrically arranged f... | 09/03/2002 |
| 6386010 | Spinning processing method and apparatus therefor According to the spinning processing method of the invention, a steel tube (4) as a work is rotated round its longitudinal axis (X). A plurality of forming rollers (23), which are arranged around the steel tube (4), are rotated round the steel tube axis (... | 05/14/2002 |
| 6233991 | Apparatus and method for spin forming a tube An improved apparatus and method are provided for spin-forming tapered rollers, including but not limited to conveyor rollers, drum pulleys, web feed rollers and the like, from a tube without using any internal or external supports between the ends of the... | 05/22/2001 |
| 5983689 | Lubricant for use in hot work A lubricant is provided for use in hot working such as cross-roll rolling of a seamless steel pipe. It effectively reduces the friction coefficient between the working tools and the material under the hot work, thus extending the lives of the tools. The l... | 11/16/1999 |
| 5927122 | Device for guiding a hollow blank A device for guiding a rotating hollow blank emerging from a cross-rolling mill, especially an Assel mill, which device includes at least two tubular guide rollers that extend over the length of the hollow blank and are arranged next to each other below t... | 07/27/1999 |
| 5644826 | Spin closing apparatus and method Apparatus for spin closing an open end of a tube of a suspension strut comprising a throughbore having a longitudinal axis; a first pair of rollers, each roller of the first pair being rotatably mounted in a bore opening into the throughbore, having a con... | 07/08/1997 |
| 5520038 | Device for manufacturing a groove bearing A moveable cage which has a pattern of holes surrounding and concentric with a central axis of the cage, and a short hard pin located within the cage, and movable back and forth between the two ends of the cage. A single drive device attached to the cage ... | 05/28/1996 |
| 5365763 | Device for shaping of helical fins on the outer wall of a tube A device for the formation by rolling of helical fins on heat exchange tubes to increase the heat transfer capacity of the tubes. The device comprises four forming rolls (6, 7, 8, 9) which are arranged on two carriages (4, 5) which are moved together in t... | 11/22/1994 |
| 5265334 | Device for manufacturing a groove bearing, and method of manufacturing a groove bearing by means of the device The invention relates to a device for manufacturing a hydrodynamic groove bearing formed with pumping grooves. The device comprises a hard pin around which, or a hard sleeve in which, a cage is arranged which has one or more annular patterns of holes whic... | 11/30/1993 |
| 5142893 | Tube mill A seamless tube mill comprises two disk rolls mounted to be driven in rotation on substantially parallel axes which axes are perpendicular to guide the workpiece along the pass line which rolls may be rotated away from the pass line to enable removal and ... | 09/01/1992 |
| 5003690 | Finning and thread rolling machine A finning and thread rolling machine capable of producing an integral finned tube, an extended finned tube or a wrap-on finned tube, whichever is desired, the tubing to be used for extended surface heat transfer. Types of tubes produced are integral low f... | 04/02/1991 |
| 5001916 | Method for the calibrated cross-section reduction of a workpiece rotating during such method. Rolling tools are rotatably mounted in rotatably driven rolling heads such that they revolve in a planetary-like fashion while the rolling heads rotate. The rolling tools thus roll with blows or impacts upon the outer surface of the rotating workpiece whi... | 03/26/1991 |
| 4915166 | Titanium heat exchange tubes Improved method and apparatus for making finned tubing from difficult to work materials such as titanium and stainless steel uses spaced sets of finning discs on a plurality of arbors to form a tube against a mandrel having different diameters under each ... | 04/10/1990 |
| 4872250 | Method for fabricating a dished hollow body possessing a linear or helical inner toothing According to the well known Grob method, there is fabricated on a mandrel provided with outer or external toothing or teeth a substantially dished or pot-shaped hollow body with corresponding inner or internal toothing or teeth. This fabrication operation... | 10/10/1989 |
| 4738128 | Skew-rolling stand In a skew-rolling stand for rolling hollow billets, in particular for stretching hollow billets into tubular blooms, work material guides are provided at the entry end and/or at the delivery end. These work material guides comprise a preferably motor-driv... | 04/19/1988 |
| 4660398 | Process for controlling a rolling mill having oblique rolls and a rolling mill for carrying out this process The invention relates to a process for controlling a rolling mill having oblique rolls which is used for rolling metal rods or tubes, and to the rolling mill for carrying out the process. The rolling mill according to the invention comprises at least thre... | 04/28/1987 |
| 4574606 | Adjusting the rolls in a rolling mill with obliquely oriented, conically contoured rolls The adjustment provides for three degrees of freedom, in which in addition to varying the distance of the rolls from the rolling axis an adjustment axis is provided generally parallel to the rolling axis and about which the roll mount can be tilted. This ... | 03/11/1986 |
| 4510787 | Method of manufacturing hollow rods A method of manufacturing hollow rods of very thick wall, in which wall thickness to outside diameter ratio is 25% or more, such as those used as work stock for manufacturing oil-well drilling collars. A cross-type or rotary mill having three or four cone... | 04/16/1985 |
| 4483055 | Secondary working apparatus A secondary working apparatus for secondarily machining a blank formed with internal serrations on a cylindrical plane, comprising a stationary housing structure, support means for supporting the blank with the center axis of the cylindrical plane fixed w... | 11/20/1984 |
| 4479294 | Secondary working apparatus A secondary working apparatus for secondarily machining a blank preliminarily formed with internal serrations, splines or teeth on a cylindrical plane, comprising a stationary housing structure, support means for supporting the blank with the center axis ... | 10/30/1984 |
| 4470282 | Method of piercing in seamless tube manufacturing The invention relates to a method of rotary piercing in seamless tube manufacturing under a rotary piercing process, such as Mannesmann mandrel mill process. Rotary piercing operation is carried out by employing a rotary piercing mill having a pair of con... | 09/11/1984 |
| 4449386 | Steel pipe rolling mill In an apparatus for changing the rolling mill rolls and/or disk shoes of a steel pipe rolling mill, the top and bottom rolls vertically movably mounted in the housing are individually placed on a supporting bed positioned below the bottom rolling roll and... | 05/22/1984 |
| 4444035 | Steel pipe rolling mill In a three-roll Assel mill capable of automatically and rapidly changing the rolls, rails are arranged on an inner housing mounted within each of a fixed housing and a rotary housing to be rotatable along the inner wall thereof, and cradles having rolls m... | 04/24/1984 |
| 4416134 | Process for manufacturing seamless metal tubes The present invention relates to the manufacture of seamless metal tubes by a cross-roll helical rolling process such as Mannesmann mandrel mill process or by a press piercing process such as Ugine Sejournet process. Shells being worked are subjected to o... | 11/22/1983 |
| 4395896 | Rotary rolling mill and method for rolling of tubular products The present invention is an improvement of such methods as the Stiefel-Mannesman piercing, and the Mannesmann piercing methods with a pair of driven rolls which impart a screw movement to the work piece, and has the roll axis inclined to the centerline of... | 08/02/1983 |
| 4387584 | Steel pipe rolling mill The present invention relates to an apparatus for changing the rolling-mill rolls and disk shoes of steel pipe rolling mills. The apparatus comprises mechanisms for raising and lowering a top and bottom cradle each holding a roll of a rolling mill and a c... | 06/14/1983 |
| 4313248 | Method of producing heat transfer tube for use in boiling type heat exchangers The invention is concerned with a heat transfer tube for use in boiling type heat exchangers, having an excellent heat transfer performance. More specifically, the invention relates to a surface condition of the heat transfer tube for improving the heat t... | 02/02/1982 |
| 4312207 | Rolling mill for forming cross ribbed pipes A rolling mill is characterized in that three hydraulic actuators, positid in a mill frame and comprising yokes with attached rolling tools therein, are provided with a piston rod having two pistons. The outer piston co-operates with an external cylinder... | 01/26/1982 |
| 4296620 | Smoothing rolling mill The feed advance capacity of smoothing rollers in a smoothing rolling mill is utilized to the fullest possible extent by displacing the smoothing rollers relative to each other in the axial direction so that the facing ends of the smoothing rollers are lo... | 10/27/1981 |
