Patents
Sitemap › B21 - Mechanical metal-working without essentially removing material; Punching metal › B21D - Working or processing of sheet metal or metal tubes, rods or profiles without essentially removing material; Punching › B21D 9 - Bending tubes using mandrels or the like
Patents for B21D 9 - Bending tubes using mandrels or the like (1,513)
01/1995
01/05/1995WO1995000268A1 Tube expanding mandrel, tube expanding method and tube expanding apparatus using tube expanding mandrel, and heat exchanger having heat exchanging tube which is subjected to tube expanding by tube expanding method
11/1994
11/23/1994CN1095319A Concentric composite spring and its apply
10/1994
10/13/1994WO1994022610A1 Internal articulated mandrel for the stretch forming of elongated hollow metal sections
10/11/1994US5353618 Apparatus and method for forming a tubular frame member
10/04/1994US5351517 Method of, and a machine for, stretching and bending a profiled length of material
09/1994
09/15/1994WO1994020234A1 Method of forming tubular members
09/07/1994CN2176201Y Man-power pipe bender
08/1994
08/31/1994CN1091340A Pipe bending technique using ice core
08/02/1994US5333481 Apparatus for spatial uncoiling and stretch-bending process in combination with a bending mandrel station
07/1994
07/12/1994US5327765 Internal articulated mandrel for the stretch forming of elongated hollow metal sections
06/1994
06/28/1994US5323631 Method for forming a hollow workpiece using a snake tool
06/22/1994CN1088140A Method of bending metallic pipe
05/1994
05/04/1994CN1086161A Method for manufacturing reducing elbow and reducing joint
05/04/1994CN1086160A Method for manufacturing bent pipe
04/1994
04/26/1994US5305625 Adjustable cutoff apparatus
04/20/1994EP0593241A1 Method of bending metallic pipe
03/1994
03/23/1994EP0588528A1 Apparatus and method for forming and hydropiercing a tubular frame member
03/16/1994CN1083748A Manufacture method of elbow
03/02/1994CN1082951A Method for bending metallic pipes
02/1994
02/16/1994CN2155966Y Numerical controlled hydranlic shaped material bending machine
01/1994
01/26/1994CN1081126A Method for bending tubes
12/1993
12/28/1993US5272905 Exterior mandrel for multiaxis bender
11/1993
11/18/1993EP0569536A1 Apparatus for bending beams
11/16/1993CA2093540A1 Device to measure and compensate for springback in tube bending operation
11/11/1993WO1993022078A1 Method and apparatus for controlled bending of strip stock
11/03/1993CN2145079Y Device for digging line pressure small-radius mid-frequency elbow
11/02/1993US5257524 Method and device for manufacturing pipe bends
09/1993
09/14/1993US5244174 Frame member
09/08/1993CN2141744Y Pipe bender
08/1993
08/31/1993US5239852 Apparatus and method for forming a tubular frame member
08/10/1993US5233859 Process for the preparation of tubular ingot moulds intended for installations for the continuous casting of steel
06/1993
06/29/1993US5222552 Tubular heat exchanger and method for bending tubes
06/16/1993EP0546319A1 Stretch bending method for bending hollow profiles and mandrel stretch bending machine
06/02/1993CN1072627A Manufacturing method, mould and product thereof for steel elbow with straight section
06/01/1993US5214951 Method and apparatus for controlled bending of strip stock
06/01/1993US5214950 Method and apparatus for bending a multiple tube
05/1993
05/26/1993CN1072358A Push machine
05/19/1993CN2133378Y Hydraulic pipe-bending machine
05/05/1993CN2131625Y Arc bending apparatus for thin tubes
04/1993
04/07/1993CN2129185Y Seamless bend push-processing machine with auto matic feeding and demoulding
03/1993
03/23/1993US5195343 Pusher apparatus for multi-axis tube bender
02/1993
02/10/1993CN1068761A High-strength jade-imitating stereo decoration board and its mfg. method
10/1992
10/20/1992CA1309002C2 Apparatus for bending rectangular tubes
09/1992
09/23/1992CN1064631A Method and device for manufacturing pipe bends
09/09/1992EP0502817A1 Method and apparatus for manufacturing a pipe bend
09/06/1992CA2061711A1 Method and device for manufacturing pipe bends
09/01/1992US5142895 Method for bending tubes
08/1992
08/11/1992US5136872 Process for the preparation of tubular ingot moulds intended for installations for the continuous casting of steel
07/1992
07/30/1992WO1992012812A1 Apparatus for bending beams
07/29/1992CN1063062A Shaping device for cold bend pipe with small radius of curvature and its shaping process
07/21/1992US5131254 Apparatus for bending beams
07/15/1992EP0494843A1 Method for making a double-walled tubular piece .
07/14/1992US5129247 Method for making an irregularly shaped drawn tube
07/14/1992CA1305028C Process and apparatus for manufacturing tube bends
07/02/1992DE4041668A1 Hollow metal profile bending - has mandrel to fill the hollow interior on entry to the bending rollers
07/01/1992EP0492211A1 Method for bending hollow metal profiles and apparatus for carrying out this process
06/1992
06/23/1992CA2058238A1 Process for bending hollow metal profiles and an apparatus for carrying out this process
06/17/1992DE3249959C2 Tube bending machine with retractable mandrel
05/1992
05/05/1992CA1299838C Mold making
04/1992
04/22/1992EP0481279A2 Method of spatial roll-stretch-bending in combination with a mandrel bending station
03/1992
03/17/1992CA1297392C Pipe bending machine
03/05/1992WO1992003237A1 Apparatus for and method of bending pipes
02/1992
02/19/1992CN2096428U Core stick for soft elbow with expansion diameter
02/13/1992DE4024936A1 Twin-wall tube bending process - by inserting container-shaped FRP packing piece having axial slits into annular gap between inner and outer tubes
12/1991
12/19/1991CA2044882A1 Method and apparatus for making an irregularly shaped drawn tube
11/1991
11/13/1991CN1014685B Mechanical tool for continuously pushing sharp bends
10/1991
10/29/1991US5060496 Heating, bending in nitrogen atmosphere doubles service life
09/1991
09/25/1991EP0448339A1 Method of forming a hollow blade
09/24/1991US5050417 Apparatus for making an irregularly shaped drawn tube
09/17/1991US5050089 Closed-loop control system
08/1991
08/13/1991CA1287561C Precision bending apparatus and process
08/06/1991US5036692 Method for bending pipes and apparatus therefor
06/1991
06/19/1991EP0432347A1 Curved pipe manufacturing method and an apparatus for carrying out same
06/11/1991CA2016474A1 Curved pipe manufacturing method and an apparatus for carrying out same
05/1991
05/28/1991US5018378 Mold making
05/15/1991EP0276290B1 Process and apparatus for manufacturing tube bends
03/1991
03/27/1991CN2073778U Thin wall special-shaped tube bender
03/21/1991DE3927989A1 Lined, bent pipe sections - obtd. by inserting straight tube into another straight tube and bending in at least one place on mechanical pipe bender
02/1991
02/27/1991EP0414545A2 Apparatus and method for forming a tubular frame member
02/05/1991US4989435 Method and apparatus for manufacturing curved pipe
01/1991
01/16/1991CN2069315U Double exhaust pipe bend-forming device for motorcycle
01/09/1991EP0406969A1 Method, apparatus and bending mandrel for bending a multiple tube
12/1990
12/11/1990CA1277478C Process and installation for continuously manufacturing structurally controlled spheroidal graphite cast iron pipes
11/1990
11/28/1990CN1047231A Precise pipe bender for cold-bending cored steel pipe with push
11/20/1990CA1276535C Apparatus for bending rectangular tubes
10/1990
10/02/1990US4959984 Precision bending apparatus
09/1990
09/26/1990EP0388824A2 Method and apparatus for drawing tubular bodies
08/1990
08/28/1990US4951493 Method and apparatus for making a spiral pipe
04/1990
04/17/1990US4916952 Mandrel for bending pipes
04/11/1990EP0362698A2 Apparatus for the automatic bending of pipes and similar items
03/1990
03/15/1990DE3929315A1 Pipe bending machine with insertable hollow spindle
02/1990
02/14/1990CN1039545A Method and mechanical tool for continuously pushing sharp bends
01/1990
01/30/1990CA1265028A1 Bending machine
01/23/1990CA1264572A1 Diminishing arm toggle linkage
12/1989
12/06/1989EP0344570A2 Method and apparatus for making a spiral tubing
10/1989
10/31/1989US4876872 Method and apparatus for manufacturing curved pipe
10/24/1989US4875353 Method and apparatus for manufacturing curved pipe
09/1989
09/27/1989EP0334294A2 Method of making arched bent metal moulds in one piece
06/1989
06/27/1989US4841760 Process and apparatus for manufacturing tube bends
06/15/1989DE3741039A1 Method for producing drainpipe bends and ventilating-pipe bends for roofing and ventilating systems
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