Used press brakes with 50-74t bending force for sale (80)

Condition: ready for operation (used), Year of construction: 2007, pressing force: 28 t, stroke length: 200 mm, throat depth: 200 mm, installation height: 325 mm, working length: 835 mm, No minimum price – guaranteed sale to the highest bidder! TECHNICAL DETAILS Press force: 28 t Fsdpfxszzkwgs Ab Ajgg Bending length: 835 mm Travel range of the back gauge: 0 – 370 mm Stroke: 200 mm Distance between frames: 890 mm Support table: 200 x 275 mm Overhang: 200 mm Installation height: 325 mm Number of cylinders: 1 Working speed Press travel: 8-10 mm/s Retraction: max. 35 mm/s Positioning accuracy: +/- 0.05 mm MACHINE DETAILS Dimensions & Weight Dimensions (L x W x H): 1,600 x 1,500 x 2,200 mm Total weight: 3,500 kg EQUIPMENT Operating manual Safety device Mechanical tool clamping (top) The height and weight of the asset must be taken into account when selecting the transport vehicle. A forklift is available for loading. If the asset is not collected on time, a storage fee of €20.00 per lot and per day (or part thereof) will be charged. The fee must be paid before collection. The sale is made without any warranty or guarantee. The information on the technical data comes from the original offer. No guarantee is given for typographical or measurement errors. If in doubt, please compare the information with the photos provided or inspect the goods on-site before the end of the auction.

Condition: ready for operation (used), Year of construction: 2001, machine/vehicle number: HFE50-20LV010254, functionality: fully functional, pressing force: 50 t, stroke length: 350 mm, throat depth: 400 mm, working width: 2,090 mm, No minimum price – guaranteed sale to the highest bidder! TECHNICAL DETAILS Number of axes: 8 Axis configuration: Y1 + Y2 + X1 + X2 + R1 + R2 + Z1 + Z2 Press force: 50 t Max. working width: 2,090 mm Frame distance: 1,665 mm Fgedpfx Abezzbalo Ajg Overhang: 400 mm Max. stroke: 350 mm Punch holder: Quick-change holder Tool holder type: European design MACHINE DETAILS Drive system: CNC Control system: Amada Operateur 2 CNC Power: 6 kW Dimensions & Weight Dimensions (L x W x H): 3,600 x 2,000 x 2,800 mm Weight: 5,500 kg Transport packages: 2 EQUIPMENT Tools Documentation CE marking

Condition: excellent (used), Year of construction: 2018, functionality: fully functional, input voltage: 400 V, input current: 32 A, input frequency: 50 Hz, type of input current: three-phase, pressing force: 560 t, stroke length: 500 mm, operating speed: 10 mm/s, reverse speed: 30 mm/s, table width: 1,400 mm, clearance between the columns: 1,260 mm, total length: 2,010 mm, total width: 1,600 mm, total height: 2,200 mm, overall weight: 4,800 kg, year of last overhaul: 2026, Equipment: CE marking, documentation/manual, safety light barrier, We are offering this very good Boschert Quick-Bend 56 CNC press brake, manufactured in 2018. Manufacturer: Boschert Model: Quick-Bend 56 CNC Year of manufacture: 2018 Condition: very good Category ID: 1466 Fgedpfx Aboy Nbw Ae Asg Type ID: 1717 Machine type: press brake If you have any further questions or need more information, please send us a message or give us a call.

Condition: used, Year of construction: 1998, Used 2500 mm bending machine by Safan Fgedpfezvyg Hjx Ab Aeg Type: SMK 50 2550 TS1 Capacity: 2550 x 50 tons TS1 CNC control Y1, Y2, X, R, Z1 and Z2 Year of manufacture: 1998

Condition: excellent (used), Year of construction: 2009, operating hours: 8,100 h, AMADA PROMECAM MODEL HFE 5020 50 TONS CAPACITY X 2000 year 2009 specification 7 AXIS CNC HYDRAULIC DOWNSTROKING PRESS BRAKE CAPACITY 50 TONS CONTROL OP 2000 CNC NO OF AXIS SEVEN X 1 X 2,Y 1 Y 2, R 1 , Z1 & Z2 BENDING LENGTH 2000 mm OPEN HEIGHT 470 STROKE LENGTH 200 THROAT DEPTH 420 MOTOR SIZE 7.5 KW APPROACH SPEED 100 BENDING SPEED 10 RETURN SPEED 100 SERIAL NO.V090090 Fgjdezn Afvspfx Ab Aog GUARDING MACHINE MOUNTED ERWIN SICK ELECTRONIC SIDE INTERLOCKED FENCING REAR INTERLOCKED year 2009 price POA specification

Condition: used, Year of construction: 2019, pressure 60.0 t chamfer lenght 1270 mm distance between columns 1000 mm column arm 410 mm ram stroke speed 160 mm/sec work speed 10.0 mm/sec return speed 165 mm/sec work stroke 275 mm dayligth 530 mm table height 900 mm table width 90.0 mm back stop - adjustable 500 mm control DA 66T oil volume 150 ltr. voltage 380 V engine output 7.5 kW Weight 4320 kg range L-W-H 2250 x 1960 x 2750 mm current new price approx. 65.000 euros very rarely used! Special price on request - in checked condition - machine video - ?v=KRifrqTgkVU ----- SPEED BEND PRO CNC press brake: * increased installation height * increased cylinder stroke * and increased bending beam speeds ----- Equipment: - CNC electro-hydraulic press brake - DELEM CNC control model "DA-66T" graphics/touchscreen * 2D graphic touchscreen programming mode * 3D representation in simulation and production * 17" color TFT screen with high resolution * Bending sequence calculation * Product programming and representation in actual size * USB interface - CNC controlled axes: Y1 - Y2 - X - R - CNC electro-motorized back stop (X axis) * on ball screws Fgjdszlulpjpfx Ab Aog * Travel path .. 500 mm * Travel speed .. 500 mm/s * with 2x manually adjustable stop fingers - CNC electro-motor height adjustment (R axis) * Travel path .. 250 mm * Travel speed .. 350 mm/s - AMADA/PROMECAM upper tool holder * including clamping jaws with upper wedge camber * 1x ROLLERI split set 60° upper tool - AMADA/PROMECAM lower tool holder * including 1x die shoe "C 1050-R" * 1x AMADA 1-V die 85° - Safety device at the rear (door including safety switch) - BOSCH/HOERBIGER hydraulic components - SIEMENS electrical components - FIESSLER AKAS laser protection device in front of the machine - 2x front support arms with SLIDING system (HIWIN plain bearings) - 1x freely movable double foot control - CE mark / Declaration of conformity - Operating instructions including circuit and hydraulic diagram

Condition: ready for operation (used), Year of construction: 2008, pressure 56.0 t chamfer lenght 1400 mm distance between columns 1300 mm throat 220 mm stroke 200 mm dayligth 485 mm work speed 8.0 - 10.0 m/min return speed 35.0 mm/sec Control CNC Boschert Fedpfx Aozy Sdxsb Ajgg back stop - adjustable 0 - 370 mm work height max. 915 mm Cylinders : 2 Stück voltage 3x 400 V connected load 8.0 kVA weight 3700 kg very good / well-maintained condition (!!) with lots of bending tools - in checked conditions - machine video - ?v=NrpZs6Ar0Vo Equipment: - NC electro-hydraulic press brake - BOSCHERT NC control unit, front - NC electro-motorized back stop (X axis) * with 2x manually adjustable stop fingers (R+Z axis) - AMADA PROMECAM (SYSTEM A) upper tool holder - AMADA PROMECAM (SYSTEM A) lower tool holder - Handwheel with analog display for adjusting the bending angle - lots of insert tools, including tool cabinet - 1x working cylinder = double-acting cylinder - upper beam made from a solid steel plate - pressure gauge for pressing pressure (infinitely adjustable) - 2x front support tables - 1x freely movable foot switch - robust machine base - rear protective device (cover + circuit breaker) - original operating instructions (machine + control)

Condition: excellent (used), Year of construction: 2015, Model Amada HFE MK2 5012 50 tons x 1250 , 4 axis CNC Press Brake Fodpfx Aoyym Hkjb Aogg Year 2015 Tonnage 50 tonnes Max. Bend Length 1250 mm Stroke Length 150 mm Approach Speed 1 - 100 mm/sec Bending Speed 1 - 10 mm/sec Return Speed 1 - 100 mm/sec Oil Capacity 55L Motor Power 6KW Weight 2550 Kg guarding Erwin Sick machine mounted light screen,side and rear interlocked fencing Dimensions Machine Length 2000 mm Machine Depth 2300 mm Machine Height 2300 mm Distance Between Side Frames 1035mm Beam width 60 mm Table height 960 mm Open Height 370 mm Throat Depth 100 mm

Condition: ready for operation (used), Year of construction: 2021, operating hours: 2,763 h, pressing force: 61 t, total width: 1,580 mm, total height: 2,545 mm, overall weight: 5,400 kg, product length (max.): 2,100 mm, number of axes: 7, This 7-axis Baykal APHS 21060 press brake was manufactured in 2021. It features a pressing force of 60 tons and a bending length of 2100 mm, providing robust performance for various applications. The machine includes a throat depth of 410 mm and a stroke of ram measuring 210 mm. If you are looking to get high-quality bending capabilities, consider the Baykal APHS 21060 press brake we have for sale. Contact us for further details. • Performance and capacity: • Distance between columns: 1600 mm • Throat depth: 410 mm • Daylight opening: 475 mm • Stroke of ram: 210 mm Fgjdpjzdktmofx Ab Asg • Table width: 60 mm • X-axis travel: 1000 mm • Backgauge axis: Y1, Y2, X, R, Z1, Z2 + crawling • Hydraulics and drive: • Hydraulic pressure: 265 bar • Oil capacity: 140 liters • Main motor power: 10.3 kW • Installed power: 11 kW • Power supply: 400 V / 50 Hz / 3 Ph • Other: • Maximum stopping time: 80 ms Additional equipment • Upper tool, 57 kg • Lower tool, 87 kg Technical Specification Bending Length 2100 mm

Condition: used, Year of construction: 2023, pressure 320 t chamfer lenght 6050 mm distance between columns 5100 mm stroke 350 mm dayligth 650 mm total power requirement 30 kW weight of the machine ca. 22.500 kg dimensions of the machine ca. 7000x2300x3200 mm Fgodpfezvq Easx Ab Asg

Condition: good (used), Year of construction: 2011, functionality: fully functional, We recommend a personal inspection to discuss the machine's details in greater depth. Fgsdpfx Abozpd Ets Ajg

Condition: excellent (used), Year of construction: 1993, AMADA MODEL ITS2 50-20 50 TONS X 2000 HYDRAULIC UP STROKING 5 AXIS CNC PRESS BRAKE COMPLETE WITH OPERATEUR 1 4 AXIS CNC CONTROL Erwin Sick machine mounted electronic guards , side and rear interlocked fencing Fgedpfx Abspygyds Aog year 1993 description TYPE HYDRAULIC UPSTROKING BENDING PRESSURE 50 TONS BENDING LENGTH 2000 OPEN HEIGHT 370 STROKE LENGTH 100 THROAT DEPTH 400 TABLE WIDTH 60 NO. OF AXIS 4 AXIS CONFIGURATIONS X1-X YI-Y2 RI-R2 BACKGUAGE can be demonstrated under power BROCHURE AND FURTHER INFORATION AVAILABLE UPON REQUEST

Condition: ready for operation (used), Year of construction: 2004, pressure 50.0 t chamfer lenght 1275 mm distance between columns 1040 mm column arm 250 mm ram stroke speed 225 mm/sec work speed 0 - 9.8 mm/sec return speed 160 mm/sec work stroke 215 mm dayligth 512 mm table height 800 mm back stop - adjustable 600 mm control DELEM DM 51 operating pressure max. 300 bar oil volume 150 ltr. voltage 400 V engine output 6.0 kW Weight 4300 kg range L-W-H 1930 x 1510 x 2390 mm current new price approx. 80.000 euros special price on request good / well-maintained condition (!!) - in checked condition - machine video - ?v=5L8L2AYv0PU ----- PLACKE electro-hydraulic CNC press brake specially developed for the production of small parts The advantages: • Low energy consumption • High operating comfort • Wide range of applications • Fast, robust, low-noise • With CNC control as standard ----- Equipment: Fedpfx Ajxab U Hsb Asgg - CNC electro-hydraulic press brake with 1x working cylinder - DELEM CNC control model "DM 51" - CNC controlled axis: Y1 - Y2 - X - CNC electro-motorized back stop * Travel path: X = max. 600 mm * Travel speed X axis .. max. 300 mm/s * Positioning accuracy .. +/- 0.02 mm * with 2x manually adjustable stop fingers (R+Z axis) - WILA standard - manual upper tool clamping - WILA standard - manual lower tool clamping - PLACKE safety device at the front: light barrier - side protective device (swivel doors) - rear protective device (swivel + lockable door) - front storage area - side sorting system for bending tools - 1x freely movable foot control - original operating instructions including circuit and hydraulic diagram

Condition: good (used), Year of construction: 2004, Used Safan E Brake press brake Type: E Brake 50 2050 HS TS1 Capacity: 2050 x 50 ton WIla clamping with 1 set of tools TS1 CNC control Fodjyykk Hjpfx Ab Aogg Y1, Y2, X, R, Z1 and Z2 CNC controlled HS High Speed version

Condition: excellent (used), Year of construction: 1989, We are offering this Amada Promecam ITS 50-20 press brake in very good condition, manufactured in 1989. Manufacturer: Amada Promecam Fgsdpfx Abszp Siaj Aog If you have any questions or require further information, please feel free to send us a message or call us.

Condition: as good as new (ex-display), Year of construction: 2024, pressure 60.0 t chamfer lenght 1270 mm distance between columns 1000 mm column arm 410 mm ram stroke speed 160 mm/sec work speed 10.0 mm/sec return speed 165 mm/sec work stroke 275 mm Fjdpfxjxabt Ae Ab Ajgg dayligth 530 mm table height 900 mm table width 90.0 mm back stop - adjustable max. 800 mm oil volume 150 ltr. voltage 400 V engine output 7.5 kW Weight 4320 kg range L-W-H 2250 x 1960 x 2750 mm Demonstration/demo machine (!!) From our showroom (like new) With very few operating hours ----- CNC press brake with special equipment * Version "ERGO" - knee room for the operator * flexible articulated arm mount for the controller * increased installation height * increased cylinder stroke * as well as increased bending beam speeds ----- Furnishing: - DELEM CNC control model DA-66T graphic/touch screen * 2D graphical programming * 17" TFT color screen with high resolution * Bending sequence calculation * Product programming and real size display * USB interface * intuitive, graphical entry of profiles * Automatic calculation of features: tool safety zones, Press force, bending tolerance, crown setting, stretched Length, embossing force, flattening, automatic rounding calculation * Radius programming * Graphic tool and product library * Collision monitoring * 3D visualization * 1GB memory - Motorized backgauge with R-axis, on ball screws - X = 800 mm R = 250 mm with 2 stop fingers - controlled axes : Y1 - Y2 - X - R - Deer foot upper tool with PS 135.85-R08, system "A" with quick-change clamp - additional crowning device in the tool holder of the upper tool - 4V universal die block M 460 R with die shoe 60 mm mount - BOSCH/HOERBIGER hydr. components - SIEMENS electrical system - LEUZE light barrier behind the machine - FIESSLER AKAS laser with FPSC protection device v.d. machine - Swiveling control panel, mounted on the left - Front, foldable sheet metal support - Double foot control - CE mark / declaration of conformity - Operating manual: Machine and control in German - Safety manual : press brakes

Condition: excellent (used), Year of construction: 1983, functionality: fully functional, input voltage: 380 V, input current: 13 A, input frequency: 50 Hz, type of input current: three-phase, pressing force: 50 t, overall weight: 50,000 kg, working width: 2,500 mm, For sale is a GÉFI LE50/2500, Hungarian-made edge bender in excellent condition, in working condition, can be tested. Fgsdpfeyznhljx Ab Asg Technical data of the pres brake : Manufacturer: GÉFI Type: LE 50/2500 Year of manufacture: 1983 Pressing force: 50 tons Maximum bending length: 2500 mm Dimensions: 2720x1550x2245 mm Weight: 5500 kg We are adding 1 1500 mm and 1 2500 mm knife, these need to be renovated.

Condition: good (used), Year of construction: 1994, functionality: fully functional, Used press brake by Darley Type EHP 50 20 15 Capacity 2050 x 50 tons Equipped with new Esa S630 control and Merlino lasersafe Includes set of tools Fgsdpsxq Dfvefx Ab Aeg

Condition: ready for operation (used), Year of construction: 2024, pressing force: 64 t, CNC Press Brake manufactured in 2024. This DAMAMT WC67K 63T/2500 CNC features a pressing force of 63 tons and a bending length of 2,500 mm. It includes advanced CNC control with 4+1 axes and motorized V-axis crowning for precision bending. If you are looking to get high-quality bending capabilities, consider the DAMAMT WC67K 63T/2500 CNC Press Brake we have for sale. Contact us for further details. • Inspection possible: Yes, in Bulgaria • CNC control • Control system: E-Touch ET18 (E-Touch 18) • Programming: 2D graphical programming, CAD import, offline programming • Remote assistance: Yes • Automatic bending-process calculation: Yes • CNC axes: 4+1 (Y1, Y2, X, R + V motorized crowning) • Main technical specifications • Distance between columns: 1,980 mm • Throat depth: 300 mm • Ram stroke: 160 mm • Maximum open height: 370 mm • Repositioning accuracy: ±0.05 mm • Fast approach speed: 200 mm/s • Bending speed: 10 mm/s • Return speed: 180 mm/s • Main motor power: 7.5 kW • Axes / backgauge • Y1/Y2: Fully synchronized • X-axis: CNC controlled • R-axis: CNC controlled • V-axis: CNC motorized crowning • Backgauge: Servo controlled • Main components • Hydraulic system: Bosch Rexroth • Main motor: Siemens • Electrical components: Schneider Electric • Ball screws / linear guides: HIWIN • Linear scales: GIVI (Italy) • Tubing / connectors: EMB (Germany) • Sealing rings: NOK (Japan) • Hydraulic pump: Sunny (USA) • Safety and compliance • Motor overload protection • Electrical leakage protection • CE safety standard Additional equipment • 1 set upper punch (heat-treated 42CrMo) • 1 multi-V lower die (heat-treated 42CrMo) • Quick-release upper tool clamps • 2 front support arms • Foot pedal with emergency stop • Safety fence Fgsdpezu Swnjfx Ab Ajg Technical Specification Bending Length 2500 mm

Condition: like new (used), - Capacity: 1600 x 50 tons - NC control (touchscreen) - 2 hydraulic cylinders Fodpfx Abozfv Ufo Aogg - Foot pedal operation - Light curtain safety system - Emergency stop - Lighting - Documentation - 400V

Condition: ready for operation (used), Year of construction: 2022, operating hours: 731 h, pressing force: 51 t, controller manufacturer: TRUMPF, controller model: Touchpoint TruBend, number of axes: 7, This 7-axis TRUMPF TruBend 7050 (B28) was manufactured in 2022. It features a press force of 500 kN and a bending length of 1,530 mm. The machine includes a dynamic electromechanical drive and a CNC-controlled crowning system for precise bending operations. If you are looking to get high-quality bending capabilities, consider the TRUMPF TruBend 7050 (B28) press brake we have for sale. Contact us for further details. • Drive: Dynamic electromechanical Torque Drive • Capacity and dimensions: • Free upright clearance: 1,305 mm • Usable installation height: 385 mm • Throat depth: 250 mm • Working height: 1,150 mm • Machine frame: Stable welded frame • Axes and backgauge: • CNC axes: 7 (Y, X1, X2, R1, R2, Z1, Z2) • Backgauge: 6-axis independent system (X1/X2/R1/R2/Z1/Z2), both units move independently • Backgauge features: Carbon-fiber fingers, hardened reference surfaces, helical rack Z-drive, flexible positioning • Travels / working range: • Y stroke: 215 mm • X travel: 240 mm (max backgauge range 500 mm) • R travel: 153 mm • Speeds: • Y rapid/return: 220 mm/s • Y working: 25 mm/s • X: 1,500 mm/s • R: 750 mm/s • Z: 2,200 mm/s • Positioning accuracy: • Y: 0.002 mm • X: 0.02 mm • Z: 0.02 mm • Crowning: • CNC-controlled crowning, automatic compensation via drive • Crowning drive integrated in the table • Suited for multi-station bending • Y-axis / press beam: • Inductive Y measuring system Fgjdpfx Abezu S Uas Aog • Dynamic spring-back compensation with automatic force-based correction • Hardened adjustable guide strips • Control system: • TRUMPF Touchpoint TruBend, 21.5" TFT Full HD (1920×1080) • Intel Core i5 2.7 GHz dual-core, Windows Embedded Standard 7 • Realistic 3D visualization, TRUMPF technology database • User management with Standard/Expert/Administrator levels • 10 user access cards included • Data interfaces: • USB, RJ45, Ethernet 10/100 Mbit/s • Central Link, OPC UA • Internet teleservice / remote diagnostics • Tool clamping and setup: • Automatic TRUMPF upper and lower tool clamping (self-centering, hardened) • Fast segment change • LED Tool Indicator integrated in upper clamping (shows setup positions/next bend station) • Safety: • Automatic BendGuard (part of Productivity Package Plus) • Optoelectronic safety system with automatic tool-height setting • Allows max permissible Y speed with foot pedal • Automatic adjustment, movable out of working area for side processing • Electronically monitored side safety doors • Electrically operated lift-up rear doors • Emergency stop • Transport securing devices • CE marking • Ergonomic package: • Front support table • Front and rear LED work-area lighting • Support for seated/standing operation • Document shelf • Drawer for measuring instruments Additional equipment • Measuring equipment: • Digital angle gauge • Digital caliper • 90-degree edge square • 1x TecZone Bend license • Wireless 2D code reader with Bluetooth connection Technical Specification Bending Length 1530 mm

Condition: excellent (used), Year of construction: 2011, pressing force: 50 t, working range: 1,600 mm, 1 Used Very Clean Bystronic 1.5metre x 50ton cnc pressbrake for sale - hydraulic down stroke Fgodpfxevq N Hce Ab Asg Description Year 2011 Pressure 50 ton Bed length: 1.6metre / 1600mm stroke 150 mm Cnc control: CYBELEC DNC 880S 4 axis in total Quick release tool clamps Total power requirement 5,5 kW Weight of the machine 4800 kg

Condition: used, Year of construction: 2000, pressure 60 t chamfer lenght 2050 mm distance between columns 1550 mm throat 255 mm stroke 165 mm dayligth 475 mm working feed 9,8 mm/sec return speed 117 mm/sec ajustment speed 150 mm/sec total power requirement 5,5 kW weight of the machine ca. 5000 kg dimensions of the machine ca. 2300 x 1500 x 2470 mm Fgsdjxrgv Hspfx Ab Ajg Equipment: - DELEM DA65 CNC control - Electric backgauge (X-axis), 600 mm - Hydraulic upper tool clamping - Front light barrier - Side and rear protective grilles - Manually adjustable stop bar, foldable (R+Z-axis) - Upper tool - 2x support arms - Machine feet - Operating instructions

Condition: excellent (used), Year of construction: 2000, functionality: fully functional, stroke length: 215 mm, controller manufacturer: Delem, working width: 1,280 mm, bending force (max.): 50 t, control type: CNC control, number of axes: 4, Equipment: CE marking, foot remote control, Used Trumpf Trumabend V 50 Hydraulic cnc 50ton x 1.2metre Press Brake For Sale Brand: Trumpf Type/Model: Trumabend V50 Year:2000 Trumabend V 50 Technical details Capacity: 50ton x 1.2metre: Full bed length: 1280 mm Fgsdjx Nip Hepfx Ab Asg CNC Brand: Delem Total axis: 4 Y1, Y2, X and R Axis

Condition: used, Year of construction: 2013, total length: 3,050 mm, total width: 1,650 mm, total height: 2,350 mm, Colour: Grey Weight: 5.690 kg - Year: 2013 - Documentation available: No - CE marking present: Yes - CE certificate present: No - Serial number: 7304138524 - Drive system: CNC - Control system brand: Durma - Power [kW]: 7.5 - Number of axes [pcs]: 3: Y1+Y2+X - Press force [ton]: 60 - Max. working width [mm]: 2050 - Column gap [mm]: 1720 - Backgauge depth [mm]: 800 - Crowning system: Mechanical - Tools included: Yes - Options: Digital readout - Transport dimensions: 3050mm x 1650mm x 2350mm (l x w x h) - Transport weight [kg]: 5690kg - Transport packages [pcs.]: 1 Financial information Fedpfx Abezbhy Te Ajgg VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum