| Patents for B21C 45 - Separating mandrels from work or vice versa (68) |
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| 01/27/2015 | US8939757 Liquid resin molding system |
| 12/09/2014 | US8904839 Method of and rolling mill for making seamless steel pipe |
| 01/08/2014 | CN203380250U Automatic device used for removing burrs |
| 03/27/2013 | CN202824223U Core shaft detaching and mounting device for lifting type adjustable hot-rolling coiling machine |
| 11/28/2012 | CN102802828A Rolling Process And Relating Longitudinal, Multi-stand Rolling Mill Of Continuous, Restrained Type For Hollow Bodies |
| 11/21/2012 | CN202539254U Drawing cart for drawing dry type bushing cores |
| 10/31/2012 | CN202506689U Automatic material pushing device for cavetto machine |
| 08/15/2012 | CN101842170B Method for producing a seamless steel pipe and rolling mill for performing the method |
| 05/09/2012 | EP2448686A2 Rolling process and relating longitudinal, multi-stand rolling mill of continuous, restrained type for hollow bodies |
| 10/19/2011 | CN102218456A Pullout device for steel wire drawing die |
| 09/28/2011 | CN101579702B New technique for producing high alloy steel high-end pipe by adopting cross rolling elongation technology |
| 09/21/2011 | CN102189105A Pearson's hot rolling machine or machine set and operation method thereof |
| 08/31/2011 | CN201950088U 一种残卷处理装置 One kind Fragments processing device |
| 08/31/2011 | CN101579703B New technique for manufacturing high alloy steel seamless pipe with heavy calibre by adopting pilger mill |
| 07/26/2011 | CA2460064C Manufacture of metal tubes |
| 06/15/2011 | CN101209458B Method for rolling tube by hot-rolled seamless tube restraint core rod continuous rolling mill |
| 05/11/2011 | EP2318159A1 Method for producing a seamless steel pipe and rolling mill for performing the method |
| 03/24/2011 | WO2011000819A3 Rolling process and relating longitudinal, multi-stand rolling mill of continuous, restrained type for hollow bodies |
| 03/23/2011 | CN101559448B Evacuation device for mandril of perforator |
| 02/09/2011 | CN101653782B Ejector rob trolley provided with rapidly replaced ejector rob |
| 01/06/2011 | WO2011000819A2 Rolling process and relating longitudinal, multi-stand rolling mill of continuous, restrained type for hollow bodies |
| 01/05/2011 | CN201693019U Die drawing device for steel wire |
| 12/01/2010 | CN101474634B Three-roller tube-rolling machine |
| 09/22/2010 | CN101842170A Method for producing a seamless steel pipe and rolling mill for performing the method |
| 09/08/2010 | CN201572819U Rod detaching mechanism |
| 08/26/2010 | US20100212387 Method for producing a seamless steel pipe and rolling mill for performing the method |
| 05/26/2010 | CN201482821U Rod uncoupling chain for pre-punching mandrel of tube blank |
| 03/11/2010 | WO2010025790A1 Method for producing a seamless steel pipe and rolling mill for performing the method |
| 01/06/2010 | CN201375993Y Mandril monitoring device |
| 11/18/2009 | CN101579703A New technique for manufacturing high alloy steel seamless pipe with heavy calibre by adopting pilger mill |
| 11/18/2009 | CN101579702A New technique for producing high alloy steel high-end pipe by adopting cross rolling elongation technology |
| 10/21/2009 | CN101559448A Evacuation device for mandril of perforator |
| 09/16/2009 | CN101534972A Spiral pipe machine |
| 02/26/2009 | WO2007130141A3 Spiral pipe machine |
| 12/17/2008 | EP2001613A2 Spiral pipe machine |
| 07/02/2008 | CN101209458A Method for rolling tube by hot-rolled seamless tube restraint core rod continuous rolling mill |
| 06/25/2008 | CN101204713A Disconnection device for punch refrigerant top |
| 12/26/2007 | EP1427550B1 Manufacture of metal tubes |
| 10/17/2007 | CN200960527Y Sheath breaking clamp for railway car bogie braking beam end axle abrasion sheath |
| 12/06/2006 | CN1287922C Method for manufacturing seamless tubes and seamless tubes manufactured with same |
| 04/06/2005 | EP1427550A4 Manufacture of metal tubes |
| 03/01/2005 | US6860134 Ironing dies |
| 12/15/2004 | CN1555298A Manufacture of metal tubes |
| 10/05/2004 | US6799357 Manufacture of metal tubes |
| 06/16/2004 | EP1427550A1 Manufacture of metal tubes |
| 06/19/2003 | US20030110825 Manufacture of metal tubes |
| 03/27/2003 | WO2003024639A1 Manufacture of metal tubes |
| 07/04/2002 | US20020083755 Ironing dies |
| 01/27/2000 | DE19832503A1 Manufacturing rotation symmetrical molded article with undercuts, slots, cavities or threading on inside, by placing removable splay sleeve inside article and then drawing it inside mold |
| 01/12/2000 | CN1048200C Apparatus for producing thin metallic tube |
| 01/20/1998 | US5709021 Process for the manufacture of metal tubes |
| 11/23/1995 | WO1995031298A1 A process for the manufacture of metal tubes |
| 01/18/1995 | CN1097360A Apparatus for producing thin metallic tubd |
| 01/15/1992 | EP0466017A1 Process for hot drawing hollow extruded or drawn aluminium bodies and equipment for application of said process |
| 09/19/1990 | CN2062261U Round ball reset releasing device for cold drawing machine |
| 05/22/1990 | US4926667 Method of sizing and straightening extruded tubes |
| 01/03/1990 | EP0348596A2 A pilgrim-process rolling mill for hot rolling pipes |
| 01/17/1989 | CA1248740A1 Method for preparing tubular chills for continuous steel casting plants |
| 05/19/1988 | DE3726898C1 Device and method for loosening the drawn stock on the mandrel bar |
| 03/31/1987 | US4653306 Method for preparing tubular chills for continuous steel casting plants |
| 04/23/1985 | US4512173 Tube release rolling mills |
| 03/27/1984 | CA1164251A1 Manufacture of seamless steel tube |
| 03/01/1983 | US4375160 Manufacture of seamless steel tube |
| 06/03/1981 | EP0029786A1 Process and device for producing a steel tube without welding joint by hot-rolling on a mandrel |
| 06/26/1979 | US4158954 Extraction device for continuous rolling mills using a retained mandrel |
| 05/30/1978 | US4091524 Process for producing pipe blooms |
| 03/16/1976 | US3943741 Embossing method |
| 01/06/1976 | US3930394 Mill for plugging tubes and taking them off plug |