| Patents for B21B 25 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group; Accessories or auxiliary means therefor (1,103) |
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| 10/07/1998 | EP0868231A1 A unit for rolling pipes on a mandrel |
| 10/06/1998 | US5816087 Method for producing a seamless steel tubular product |
| 08/19/1998 | EP0859369A1 Method for the manufacture of a thimble for a nuclear reactor fuel assembly, forming mandrel for such a thimble and thimble obtained by this method |
| 07/14/1998 | US5778714 Method for manufacturing seamless pipe |
| 07/09/1998 | WO1998029204A1 Plug and mandrel bar for rolling of seamless steel pipe and method of manufacturing seamless steel pipe |
| 06/18/1998 | DE19714317C1 Surface treatment of steel tool, especially cold pilger rolling mandrel |
| 05/13/1998 | CN1181414A Lubricant compsn. for heat working |
| 05/06/1998 | EP0839895A2 Lubricant for use in hot work tools |
| 01/13/1998 | US5706689 Single-piece self-guiding high mill plug |
| 11/20/1997 | DE19636321C1 Method for prolonging working life of internally cooled piercers |
| 11/18/1997 | US5687604 Thermal controlled mandrel with replaceable tip for copper and brass extrusion |
| 10/22/1997 | EP0801996A1 Method for producing a seamless steel tubular product |
| 08/06/1997 | EP0787542A2 Mandrel and mandrel bar for skew-rolling mills |
| 08/06/1997 | CN1156422A Method and device for placing plugs on a plug mill |
| 07/08/1997 | US5644938 Method of and roll stand for diagonal rolling of tubes |
| 06/11/1997 | EP0777538A1 Method and device for placing plugs on a plug mill |
| 06/11/1997 | CN2255884Y Piercing mill head with internal rib guiding water cooling system |
| 06/05/1997 | WO1997019767A1 A unit for rolling pipes on a mandrel |
| 04/23/1997 | EP0632752A4 Piercing mill for seamless tube manufacture. |
| 04/09/1997 | CN2251449Y Lubricating device of mandrel for metal tube rolling mill |
| 04/09/1997 | CN2251448Y Combined all floating long core rod |
| 12/17/1996 | US5584203 Rolling mandrel changing device for a plug mill |
| 12/11/1996 | CN1137426A Interchanging mandrel device for core rod tube rolling mills |
| 11/20/1996 | EP0743106A1 Method for manufacturing seamless pipe |
| 10/08/1996 | US5563808 Pilger mill mandrel measuring device |
| 09/19/1996 | DE19510860A1 Mandrel bar carrier for plug rolling mill |
| 09/10/1996 | CA2166520A1 Single-piece self-guiding high mill plug |
| 08/27/1996 | US5548987 Roll mandrel monitoring arrangement in cold pilger mills |
| 06/20/1996 | DE4445057A1 Rapid exchange of prestressed screwed component |
| 05/22/1996 | EP0593709B1 A rolling stand for generic rolling mills having three or more adjustable driven rolls |
| 03/26/1996 | US5501091 Method and apparatus for elongating metal tubes by means of a mandrel mill |
| 02/29/1996 | WO1996005921A1 Method and device for placing plugs on a plug mill |
| 02/28/1996 | EP0698426A1 Mandrel changer for plug-mills |
| 02/28/1996 | CN2220908Y Full automatic hot rolling seamless steel pipe powdered lubricant spraying device |
| 02/22/1996 | DE4428530A1 Pipe mfr., e.g. cross-rolling of pipes with medium or low wall thickness |
| 01/31/1996 | CN1115696A Piercing head and tube-rolling method for rolling thin-wall hollow billet in two-high mill |
| 09/27/1995 | CN1108974A Cold pilger mill for rolling long tube block |
| 09/19/1995 | US5450741 Roll tool for cold pilger rolling of pipes |
| 09/13/1995 | CN1108157A Apparatus for detecting Pilger cold rolled tube |
| 08/10/1995 | DE4431389C1 Plug handling in plug rolling mills |
| 07/05/1995 | EP0661113A1 Cold pilger mill for rolling long tubular stock |
| 06/08/1995 | DE4340813A1 Lubricant heating equipment and a lubrication system for internal tooling in tube mills |
| 04/18/1995 | US5406820 Piercing mill for seamless tube manufacture |
| 04/05/1995 | EP0646424A1 Mandrel monitor for cold pilger mills |
| 01/11/1995 | EP0632752A1 Piercing mill for seamless tube manufacture |
| 12/01/1994 | DE4318925A1 Piercing mandrel bar |
| 11/30/1994 | CN2183832Y Impulse coating apparatus for surface of core rod of hot-rolling steel tube |
| 11/04/1994 | CA2122383A1 Pilger mill mandrel measuring device |
| 10/19/1994 | CN1093622A Method and apparatus for elongating metal tubes by means of a mandrel mill |
| 08/17/1994 | CN1090798A Device and method for monitoring core rod of high-speed cold mill for seamless tube |
| 07/26/1994 | US5331835 Rolling stand, having three or more driven and adjustable rollers |
| 07/26/1994 | CA2020728C Adjustable guide for rotating cylindrical member |
| 06/15/1994 | EP0601932A1 Method and apparatus for elongating metal tubes by means of a mandrel mill |
| 04/27/1994 | EP0593709A1 A rolling stand for generic rolling mills having three or more adjustable driven rolls. |
| 04/14/1994 | DE4234566A1 Rolling tools for cold pilger-rolling of tubes - comprises roll and mandrel profiles having kink-free parabolic transitions between reduction and smoothing zones. |
| 04/06/1994 | CN1084788A Making method of two-direction inner-diameter changeable pipe material |
| 03/02/1994 | EP0156922B2 Cross helical rolling mill for seamless steel tubes. |
| 12/29/1993 | CN1079923A A rolling stand for generic rolling mills having three or more adjustable driven rolls |
| 12/15/1993 | CA2087758A1 Tube loading sleeve for pilger mill |
| 10/28/1993 | WO1993020960A1 A rolling stand for generic rolling mills having three or more adjustable driven rolls |
| 10/27/1993 | CN1077665A A rolling stand having three or more driven and adjustable rollers |
| 10/20/1993 | EP0565772A1 A rolling stand, having three driven and adjustable rollers |
| 09/30/1993 | WO1993018870A1 Piercing mill for seamless tube manufacture |
| 08/25/1993 | EP0557040A1 Sleeve for protecting a tube inside during loading onto pilger mill mandrel |
| 06/09/1993 | CN2135409Y Hole shape block for two-roll cold-rolling machine |
| 05/19/1993 | CN1020682C Improved hot-rolling process for seamless tubes with preliminary diameter reduction of semifinished products |
| 03/17/1993 | CN1069915A Top head for metal tube rolling mill and its making method |
| 02/16/1993 | US5186035 Insertion of removable protective sleeve for minimization of defects on inner surfaces of zircaloy tubing |
| 10/22/1992 | DE4112614A1 Mandrel for cold and/or hot rolling metal articles - has alternating high-strength antiwear and antifriction surfaces |
| 07/01/1992 | CN1062311A Limiting and clamping device of mandrel for inclined rolling on tube-rolling mill |
| 05/05/1992 | US5109689 Hot-rolling process for seamless tubes with preliminary diameter reduction of the semifinished products |
| 02/05/1992 | CN1015342B Process and device for making hollow billets into tube |
| 10/03/1991 | WO1991014519A1 Extrusion mandrel |
| 08/14/1991 | DE4004155A1 Cooling and lubrication of mandrel by single medium - in piercing and elongating hollow ingots |
| 07/16/1991 | US5031434 Plug for manufacturing seamless steel pipe |
| 06/23/1991 | CA2032881A1 Durable method for producing finned tubing |
| 06/12/1991 | CN1052063A Improved hot-rolling process for seamless tubes with preliminary diameter reduction of semifinished products |
| 06/05/1991 | EP0430909A2 Improved hot-rolling process for sealess tubes with preliminary diameter reduction of the semifinished products |
| 05/29/1991 | CN2077762U Core rod limiting and clamping device for pipe slant rolling machine |
| 05/21/1991 | US5016460 Durable method for producing finned tubing |
| 05/21/1991 | US5016456 Process for making hollow billets into tubes |
| 04/25/1991 | DE3935190A1 Cooling and lubrication system for tube rolling mandrels - in which two rows of nozzles parallel to mandrel axis sprays are retracted, slowly rotating mandrel with cooling fluid and lubricant |
| 04/10/1991 | EP0421575A1 Adjustable guide for rotating cylindrical member |
| 03/06/1991 | CN1049618A Stretching-homogenizing device for mfg. circular hollow objects of seamless steel tube |
| 02/21/1991 | WO1991001824A1 Device for elongating and equalizing round hollow blanks for the manufacture of seamless tubes |
| 12/19/1990 | EP0403426A1 Method and device for calibrating the internal surface of a tubular part |
| 12/13/1990 | WO1990014900A1 Drilling roller/press for producing round, hollow bodies |
| 12/12/1990 | CN1047637A Press drilling mill for fabrication of round hollow objects |
| 12/05/1990 | CN1047535A Secondary punch heading top for rustless steel pipe base |
| 11/06/1990 | US4967579 Adjustable guide for rotating cylindrical member |
| 10/30/1990 | US4966022 Method and apparatus for lubricating the mandrel upon the manufacture of seamless tubes by the cold pilger process |
| 09/18/1990 | US4956988 Mandrel rod for pipe rolling mills |
| 09/05/1990 | EP0385439A1 Plug for manufacturing seamless steel pipe |
| 08/30/1990 | DE3905559A1 Cross-rolling mill for the manufacture of seamless tubes |
| 05/29/1990 | US4928507 Methods and apparatus for manufacturing seamless tube |
| 04/04/1990 | EP0361632A2 Method for guiding elongate hollow cylindrical rolled material |
| 03/28/1990 | CN1040747A Mandrel rob for pipe rolling mills |
| 03/07/1990 | EP0356743A2 Mandrel rod for tube rolling mills |
| 02/08/1990 | DE3826120A1 Apparatus for the reciprocating rolling of tubes |
| 01/03/1990 | EP0348596A2 A pilgrim-process rolling mill for hot rolling pipes |