Patents for B21D 24 - Special deep-drawing arrangements in, or in connection with, presses (1,969)
07/1994
07/06/1994CN1025296C Method and device for pressing sheet material on elastic forming die
06/1994
06/23/1994DE4242442A1 Automatic, iterative optimisation of drawing processes in presses - with comparison of the noise emitted during drawing with stored reference values, and control of the holding-down force on the basis of the comparison outcome
06/09/1994DE4240819A1 Press and method of generation - using pressure in pressure cushion to regulate pressure applied by moveable pressure table
05/1994
05/11/1994EP0596697A1 Device and method for measuring and adjusting pressing load values on a press
05/11/1994EP0596696A1 Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
05/04/1994EP0595417A1 Spring device
05/03/1994US5307728 Control arrangement for regulating the speed of a pressure cylinder
05/03/1994US5307665 Electromagnetic re-draw sleeve actuator
04/1994
04/28/1994DE4312589A1 Hydraulic press with shortened work time - with valve unit to control fluid flow during pressure build-up
04/26/1994US5306190 Forming process for a sheet of perforated metal and process implementation device
04/20/1994EP0592670A1 Method of preventing plungers from bottoming in die cushion pin pressure equalizing system
04/05/1994US5299444 Hydraulic cushioning system for press, having hydraulic power supply including means for adjusting initial pressure to be applied to pressure-pin cylinders
03/1994
03/30/1994EP0589127A1 Leaf spring cambering apparatus
03/30/1994EP0589066A1 Method for making products by force or pressure influenced drawing processes
03/22/1994US5295383 Hydraulic cushioning system for press, having shut-off valve for disconnection of pressure-pin cylinders from power supply upon contact of movable die with workpiece
03/16/1994EP0586669A1 Press with a hydraulic drive, in particular a sheet-shaping press
03/10/1994DE4329554A1 Vehicle wheel with variable press-in depth - has adjustable axial gap in region of wheel fastening plane
03/09/1994EP0585589A1 Method of automatic and iterative process optimization of drawing operations in presses
02/1994
02/23/1994CN2156962Y Constantforce edge press type double action die carrier
01/1994
01/19/1994EP0579119A1 Redraw carriage for crank and slide press
01/18/1994CA1326172C Power press with improved cushioning system
12/1993
12/28/1993US5272898 Device for stamping materials in sheet form, especially sheet metal blanks
12/16/1993DE4218953A1 Hydraulic drive for sheet metal forming machine - has differential cylinder for press piston, suction oil pump and delivery oil pump for two cylinder halves
12/16/1993DE4218952A1 Hydraulic drive for sheet metal forming machine - has two differential cylinders for press pistons, suction oil pump and delivery oil pump for cylinder halves
12/15/1993EP0573830A1 Hydraulic drawing system in a press
12/01/1993EP0572301A1 Deep-drawing device for sheet material in a die made of resiliently deformable material
11/1993
11/28/1993CA2096461A1 Sheet materials punching device mounted on a flexible punch and die
11/11/1993DE4214818A1 Hydraulic deflection compensation in deep drawing presses - with the hydraulic pressure varied according to the measured press load
10/1993
10/26/1993US5255552 Hydroelastic deep-drawing apparatus
10/26/1993US5255550 Device for drawing sheet materials in particular sheet blanks
10/20/1993EP0566431A1 Device for deep-drawing of a sheet blank
10/20/1993EP0566308A2 Method and apparatus for adjusting press operating conditions depending upon dies used
10/19/1993US5253505 Press with a drawing apparatus
10/14/1993WO1993019866A1 Hydraulic drive for a press, in particular a sheet-shaping press
10/13/1993EP0565347A2 Method and apparatus for measuring blank holding force acting on pressure ring of a press
10/13/1993EP0564977A1 Run up control system for the pressure cheek in a drawing apparatus
10/05/1993US5249448 Redraw carriage for crank and slide press
09/1993
09/28/1993US5247872 Multi-stage hydraulic actuator
09/22/1993EP0561310A1 Apparatus for cold-deforming of plastic sheets, in particular polypropylene sheets of different thickness
09/19/1993CA2091877A1 Tools for cold-forming plastics films, particularly polypropylene films of various thicknesses
09/13/1993CA2088019A1 Plastic working method for a holed member
09/07/1993US5241849 Drawing apparatus in the bedplate of a press
08/1993
08/25/1993EP0556390A1 Die cushion device of press machine
08/17/1993US5235859 Control console for gas die cylinder systems
07/1993
07/21/1993EP0551624A1 Multi-stage hydraulic actuator
07/14/1993CN2137997Y Metal plate curved shaping machine
07/08/1993DE4200205A1 Deep drawing press for sheet metal workpieces - has hydraulic cylinder to support the workpiece whilst being deep drawn
07/06/1993US5224370 Leaf spring cambering apparatus
06/1993
06/24/1993DE4142506A1 Tool for deep-drawing of formed sheet metal parts - has cylinder block on tool part, with working and master cylinders, and movable pressure plate
06/23/1993EP0547153A1 Can body maker with magnetic ram bearing and redraw actuator
06/22/1993US5220820 Apparatus and method for cushioning movement of a member in a press
06/16/1993EP0546270A1 Method of transforming brittle material
05/1993
05/26/1993EP0543177A1 Hydraulic actuator
05/19/1993EP0542552A1 Thickness-reduced draw-formed can
05/19/1993DE4137398A1 Press for drawing with thrust bolts - transfers force to prevent tool displacement and avoids tool displacement during forming
05/12/1993EP0541427A1 Device for press-forming sheet materials especially metal blanks
05/05/1993CA2081962A1 Device for drawing sheet materials, in particular sheet metal blanks
04/1993
04/14/1993EP0536952A1 Method of draw-forming a metal sheet having an organic film
03/1993
03/25/1993DE4131603A1 Deep-drawing tool for sheet steel - has forming sleeve surrounding forming contour, between sheet holder and contour, and support on additional piston
03/10/1993EP0531141A1 Hydraulic cushioning system for press, having shut-off valve for disconnection of pressure-pin cylinders from power supply upon contact of movable die with workpiece
03/10/1993EP0531140A1 Hydraulic cushioning system for press, having hydraulic power supply including means for adjusting initial pressure to pressure-pin cylinders
03/10/1993EP0530739A1 Control circuit for the control of the speed of a pressure cylinder
02/1993
02/04/1993WO1993001901A1 Electromagnetic re-draw sleeve actuator
01/1993
01/21/1993WO1993001012A1 Die cushion system in press
01/07/1993DE4122128A1 Hydro-elastic deep drawing of sheet metal workpieces - uses system which automatically actuates punch mounted in baseplate, with metal blank being gripped between hold-down plates
01/07/1993DE4121869A1 Deep drawing press with control of blank holding down pressure - metal blank held in place by number of vertical rods actuated by attached stepped pistons operating in correspondingly stepped cylinders
12/1992
12/29/1992US5174146 Method and device for forming a part in relief on a sheet metal blank
12/23/1992WO1992022392A1 Die cushion pin pressure equalizing system, method of calculating peak oil pressure in the system and method of calculating service life of pressure equalizing hydraulic cylinders
12/23/1992WO1992022391A1 Method of preventing plungers from bottoming in die cushion pin pressure equalizing system
12/08/1992US5168738 Control system for a hydroelastic deep-drawing device
12/02/1992EP0515881A1 Press with drawing device
11/1992
11/12/1992DE4115443A1 Press and tool for deep drawing of formed sheet metal parts - has hydraulic element, with rapid action coupling to hydraulic system of press
11/05/1992DE4114496A1 Control system for sheet-metal deep drawing press - with the drawing velocity varied as a function of the sheet holder velocity
10/1992
10/28/1992EP0510507A1 Drawing device in the table of a press
10/28/1992EP0510505A1 Drawing device in a press
10/27/1992US5157969 Apparatus and method for hydroforming sheet metal
10/07/1992CN1018528B Device for pressing sheet material
09/1992
09/17/1992DE4123517A1 Hydraulic press table flexure compensation for deep drawing press e.g. for vehicle body component mfr. - using detected flexure to adjust hydraulic support press
09/10/1992DE4104136A1 Press for deep drawing of sheet metal workpieces - has hydraulic devices to control movement of punch and ram
09/01/1992US5143747 Coating with organosilicon compound, doping with inert gas to transform to silicon carbide; wear resistance
08/1992
08/27/1992DE4105839A1 Deep drawing sheet metal press - has blank held in place by hydraulically loaded pressure plate
08/25/1992US5140895 Valve mechanism for controlling a pressure difference between an upper and a lower chamber of a hydraulic cylinder for a die cushion for a press
08/19/1992EP0499197A2 Improved die tooling for metal working and method for its production
08/18/1992US5138857 Drawing device in a press for drawing shaped sheet-metal parts
07/1992
07/23/1992DE4101606A1 Plate holding force booster for press - has short stroke cylinders of multistage type engageable by several pressure levels via valves
07/16/1992DE4100716A1 Sheet metal hold-down device in single-acting press - has mechanical device to couple power transmission element
07/09/1992DE4100206A1 Hydroelectric deep-drawing device - has drawing die cushion plate with multi-point drive and short stroke piston
06/1992
06/24/1992EP0491602A1 Device for press-forming sheet materials and especially metal blanks
05/1992
05/21/1992DE4036408A1 Hydraulic system for sheet metal press - has one-way valves to connect cylinder chamber, and includes pressure reduction valve
05/17/1992CA2030156A1 Dimpling machine
05/03/1992WO1992007711A1 Die cushion device of press machine
04/1992
04/22/1992EP0455806A4 Apparatus and method for hydroforming sheet metal
04/21/1992US5105645 Method of redrawing metal cup
04/16/1992DE4128623A1 Piston and cylinder assembly
04/16/1992DE4128610A1 Press assembly with cushion assembly and auxiliary device
04/09/1992DE4128973A1 Blank holding down device for metal forming press - has four hydraulic cylinders with pressure controlled by pressure regulator
04/09/1992DE4031645A1 Hydroelastic deep-drawing die-cushion control for press - provides unequal distances for accelerations of workpiece holder and die attaining identical speeds at synchronism point
03/1992
03/31/1992US5100113 Pneumatic die cushion equipment
03/31/1992US5099673 Drawing apparatus in drawing stages of presses
03/24/1992US5098071 Die spring apparatus
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