Used Punching Nibbling Machine for sale (64,456)

Condition: excellent (used), Year of construction: 2005, functionality: fully functional, Excellent condition No heavy use Djdpszc Rucofx Ahgjci

Condition: used, Year of construction: 2007, Control system, manufacturer: Boschert; quick-change tool system, manufacturer: Trumpf; punching force: 3 x 280 kN; Station 1: Trumpf system tool, size 3 (105 mm) with spray device; Station 2: Trumpf system tool, size 3 (105 mm), free-rotating and indexable; Station 3: Trumpf system tool/Boschert Revotool, size 3 (105 mm), including Revotool 8-position tool holder; travel distances: X – 3,000 mm (adjustable up to 9,999 mm), Y – 1,580 mm; punching arm overhang: 1,730 mm; sheet metal thickness max.: 6 mm (clamp opening); stroke height max.: 90 mm, programmable in infinitely variable steps upwards and downwards; punching slug extraction; ball bearings in the machine table; table width left + right: 3,200 mm each; table depth: 2,810 mm; table height: 900 mm; overall width: 6,482 mm; overall depth: 4,600 mm; overall height: 2,110 mm; with workshop trolley, manufacturer: KS Tools, 7 drawers, contents: various hand tools. Dedpfx Ahjzkah Tjgeci +++ ATTENTION: This machine is part of an online auction! +++

Condition: used, Year of construction: 2003, functionality: not functional, machine/vehicle number: 2053, punching force: 240 t, travel distance X-axis: 2,000 mm, travel distance Y-axis: 1,500 mm, overall weight: 12,000 kg, compressed air connection: 10 bar, cutting force: 24 t, Equipment: safety light barrier, We are offering this used, non-operational Rainer LUX1220 T.T. punching/nibbling machine, manufactured in 2003, free of charge, provided it is dismantled and collected by the buyer. Accessories: Various tools. Model: LUX1220 T.T. Machine number: 2053 Year of manufacture: 2003 Punching force: 240 kN Weight: 12,000 kg If you have any questions or require further information, please do not hesitate to contact us. Dsdpszivd Usfx Ahgjci

Condition: good (used), functionality: fully functional, Year of construction: 1999, Pressing force: 220 kN Sheet metal thickness – max.: 8 mm Travel distance – x: 3000 mm Travel distance – y: 1500 mm Positioning speed, X-axis: 90 m/min Positioning speed, Y-axis: 60 m/min Positioning speed, simulation: 108 m/min Positioning speed, rotary axis: 360 °/sec Punching diameter: 76.2 mm Workpiece weight: 150 kg Smallest programmable path dimension: 0.01 mm or 0.01° Tool stations: 15 pieces Tool change time: 1.5 - 6.5 sec Machine weight, approx.: 11,050 kg Dimensions: 6400 x 5800 x 2100 mm including setup cassettes including tool cabinet with tools including Quick-Set Dedezil Dkjpfx Ahgjci

Condition: used, functionality: fully functional, Year of construction: 1998, Punching force: 165 kN Working area: 2070 x 1280 mm Sheet metal thickness: 6.4 mm Control system: CC 220 Workpiece weight: 150 kg Punching diameter: 76.2 mm Dcsdszilz Aopfx Ahgei X-axis: 80 m/min Y-axis: 55 m/min Machine weight, approx.: 8000 kg

Condition: good (used), Year of construction: 2014, functionality: fully functional, Sheet width: 3000 mm Sheet length: 1500 mm Sheet thickness: 8 mm Workpiece weight: 200 kg Punching force max.: 220 kN Total power requirement: 9.5 kW Space requirement approx.: 7395 x 6540 x 2072 mm Dedpfey Sak Tjx Ahgjci Equipment: Punch head: - Hydraulic single-tool chuck with 360° rotation - Manually adjustable clamping force - Programmable clamp (active/passive/re-positioning) - Spray lubrication for punch - Stroke counter for punch - Level monitoring for threading and tool lubrication Control system: - Open control system based on Sinumerik 840 D - 12" TFT color display - Teleservice via internet - Automatic shutdown Data transfer: - USB interface - RJ-45 network connection Safety: - CE marking - Dual light curtains - Rapid shutdown of hydraulics - Bulge detection Programming: - TruTops Punch via network access 1 x MultiTool function 1 x MultiShear function 1 x Thread forming function 1 x Deburring and rolling technology 1 x SoftPunch function 4 x individually openable clamping jaws 4 x height-adjustable clamping jaws 1 x Re-positioning cylinder 1 x Sensor for stripper (included in rest material-free processing) - GripMaster - Rest material grippers with sensor technology - Shear lift table 400 mm - Tilting rest material pallet 3000 x 1500 mm - SheetMaster - Operating hours: 65,000 h

Condition: used, Year of construction: 2001, punching force: 2,800 t, total length: 2,500 mm, sheet thickness (max.): 8 mm, overall weight: 11,500 kg, table length: 1,250 mm, Offered for sale. Nice Boschert punching nibbling machine. Comes with a large selection of tools. Dcjdpfjyiz I Tsx Ahgoi

Condition: defective spare-parts repository (used), Year of construction: 1995, Euromac hydraulic stamping machine Inventory no. 3723 * Manufacturer: Euromac * Type: XP 950/30 CNC * Capacity: 30 tons * Table size: mm * Stroke rate: 180 strokes/min * Table size approx. 4000 x 1300 mm * Cabinet with accessories Dedpjzd Hv Rofx Ahgjci * Electrical fault

Condition: used, Year of construction: 2001, operating hours: 563 h, functionality: fully functional, machine/vehicle number: 258, punching force: 20 t, total height: 2,200 mm, total width: 3,200 mm, total length: 4,890 mm, sheet thickness (max.): 6 mm, type of input current: three-phase, workpiece weight (max.): 100 kg, overall weight: 11,500 kg, input current: 48 A, input frequency: 50 Hz, compressed air connection: 6 bar, feed rate X-axis: 82 m/min, feed rate Y-axis: 82 m/min, feed length X-axis: 2,000 mm, feed length Y-axis: 1,270 mm, input voltage: 400 V, positioning accuracy: 0.07 mm, pressing force: 20 t, Equipment: safety light barrier, Description TECHNICAL DETAILS Oil capacity: 160 l Turret speed: 25 rpm Travel ranges Machine travel range without repositioning: 1,250 mm x 2,000 mm Machine travel range with 1 repositioning: 1,250 mm x 4,000 mm Machine travel range with 1 repositioning and 1 flipping: No flipping capability Processing The machine is equipped with brush strips and ball-bearing elements in the table, so both processing methods can be used directly. Max. sheet metal thickness over the ball-bearing elements: 6 mm Max. sheet metal thickness over the brush strips: 3 mm Max. weight per table: 100 kg Accuracy Punching accuracy (in standard mode): ±0.1 mm Positioning accuracy (repeatability): ±0.07 mm Control and axes Pneumatic clamping devices: 2 Number of simultaneously controlled axes: 3 (X, Y, C) Performance Strokes per minute, feed rate 25.4 mm: X320 / Y250 Working cycle nibbling, feed rate 1 mm: X920 / Y920 Tools Minimum programmable step: 0.01 mm Number of tools: 31 Max. tool diameter: 88.9 mm Amadex stations: 2 x 11 1/4" + 1 x 2" Dcedpfxjzc Dvmo Ahgji Note: No tools included.

Condition: good (used), Year of construction: 2017, operating hours: 48,888 h, functionality: fully functional, X Working area max.: 2000 mm (without repositioning) Y Working area max.: 1250 mm Operating hours: 48,888 hours Control system: Bosch PNC-P Machine - C-frame - Coordinate guidance - Linear magazine with 15 positions for clamping claws and tools - Hydraulic clamping claws (2 pieces) - Drives with maintenance-free three-phase motors - Repositioning device with programmable pressure plate - 1st stop pin (right inside) - Dividing slide Punching head - Electro-hydraulic punching head - Rotatable mono-tool holder - Programmable pressure plate position - Tool length compensation - Spray lubrication for the punch - Punch slug extraction - Forming function Control system - TRUMPF control system based on Rexroth IndraMotion MTX - Operating panel with 15" TFT color screen - Integrated technology data - Teleservice interface via the internet - Automatic shutdown - Program management - Production plan Data transfer - USB interface - RJ45 network connection Dcsdpeza E Husfx Ahgei Safety - CE marking - Multi-beam light curtains - Rapid shutdown of drives Extended standard equipment - Ball tables - Chip container - Initial oil filling - Additional clamping claw - Foot switch for start - Bulge detection - Vibration-damped installation - 5 RTC cassettes with die holders

Condition: good (used), Year of construction: 2008, functionality: fully functional, X working area max.: 3000 mm Y working area max.: 1500 mm Control system: Sinumerik 840D Standard equipment: - Sturdy C-frame - Coordinate guidance with integrated linear magazine, 25 positions for tools and clamping jaws - 4 clamping jaws - Automatic part slide 500 x 500 mm - Drives: Maintenance-free three-phase servo motors Punch head: - Hydraulic mono-tool holder - 360-degree rotation for all tools - Automatic tool length compensation - Tool spray lubrication - 2nd lubricant tank - Programmable wiper movement - Punch slug extraction - Programmable clamping device for re-clamping with pre-selectable clamping force - Bulge detection Control system: - 10.4-inch TFT display - Simple operation - Diagnostic function - Integrated 3.5-inch floppy disk drive - RJ45 network connection Safety: - CE marking Djdpfx Ahoza Elqsgjci - Multi-beam light barriers - Rapid shut-off of hydraulics + Multitool function + MultiBend function + Thread forming function + Marking/fast beading function + Deburring and rolling technology + Individually opening clamping jaw + Re-clamping cylinder + Sensor for part slide + Vibration-damped installation + Automatic shut-off + Chip conveyor + MDE interface + ToolMaster 70

Condition: good (used), Manufacturer: LVD STRIPPIT Type: Global 20 FANUC Control: FANUC 180i-P Year of manufacture: 2006 Thick turret WILSON tool system Dcedpfxov Ic Tqe Ahgei Under power inspection possible Large package tooling WILSON Auto indexing rotation tools included Laser safety guids included Specifications Metric US standard Table load 150 Working area X axis 2500 mm Working area Y axis 1250 mm Working area X axis with takeover 5000 mm Punching force 20 T Max. sheet thickness 6 mm Turret positions 30 Auto index. positions 4 Positioning speed X and Y axis 4500 mm/min. Turret change speed 900 rpm Dimensions (estimate) Length 6400 mm Width 5600 mm Height 2445 mm Weight 16500 kg Please note: The information on this page is correct to the best of our knowledge and belief and, where possible, has been obtained from the manufacturer. The information is given in good faith but its accuracy cannot be guaranteed. Accordingly, it will not constitute a representation and terms of contract. We recommend that you check all important details.

Condition: new, Year of construction: 2024, TP Turret Punch Presses With the Durma TP series of punch presses, you can achieve top quality with a precise and fast turret, improved hydraulics, and 3 automatic indexing stations. Featuring a movable table, partial unloading container, automatic clamps, CAD/CAM software, and a control unit, Durma turret punch presses are easy to operate. Automation systems that increase both work safety and productivity also enhance user safety while reducing downtime. Punching force: 30 tons Working area: 3,000+R x 1,500 mm X-axis travel: 3,000+R mm (adjustable) Y-axis travel: 1,500 mm Y-axis speed: 60 m/min X-axis speed: 70 m/min Djdpfx Aeg Admfohgoci Combined X+Y speed: 92 m/min Max. stroke rate (in 1 mm increments, 1 mm sheet thickness): 1,100 strokes/min Max. stroke rate (in 25 mm increments, 1 mm sheet thickness): 325 strokes/min Max. marking speed: 1,200 strokes/min Main cylinder stroke: 40 mm Max. punching stroke: 25 mm Max. cutting capacity with fixed tool station (steel): 6 mm Max. cutting capacity with fixed tool station (NiRo): 3 mm Max. cutting capacity with indexing station (steel): 3 mm Max. cutting capacity with indexing station (NiRo): 1.5 mm Tool changer (27 stations without tools and holders): 11 x A-station fixed: 0.8-12.7 mm 11 x B-station fixed: 12.8 - 31.7 mm 2 x C-station fixed: 31.8 - 50.8 mm 1 x D-station fixed: 50.9 - 88.9 mm 3 x D-station indexing: 50.9 - 88.9 mm Positioning accuracy: +/- 0.1 mm Repeatability: +/- 0.05 mm Tool changer rotation speed: 22 rpm Auto-index rotation speed: 150 rpm Max. sheet weight: 200 kg Table height: 940 mm Air pressure: 6 bar Max. punching diameter (D-station): 88.9 mm Motor power: 7.5 kW Main dimensions: Height: 2,310 mm Width without light curtains: 6,300 mm Width with light curtains: 8,300 mm Length without light curtains: 6,650 mm Length with light curtains: 7,650 mm Weight: 19,500 kg

Condition: ready for operation (used), Year of construction: 1998, functionality: fully functional, machine/vehicle number: 070804, punching force: 16 t, sheet thickness (max.): 6 mm, travel distance X-axis: 2,070 mm, travel distance Y-axis: 1,280 mm, punching diameter: 76 mm, TECHNICAL DETAILS Punching force: 165 kN Working area: 2,070 x 1,280 mm Sheet thickness: 6.4 mm Workpiece weight: 150 kg Punch diameter: 76.2 mm X-axis speed: 80 m/min Y-axis speed: 55 m/min Dodpfx Aozapqdshgjci Control system: CC 220 MACHINE DETAILS Machine weight: approx. 8,000 kg

Condition: ready for operation (used), Year of construction: 1995, operating hours: 51,658 h, functionality: fully functional, punching force: 22 t, sheet thickness (max.): 8 mm, travel distance X-axis: 2,500 mm, travel distance Y-axis: 1,250 mm, TECHNICAL DETAILS Sheet width: 2,500 mm Sheet length: 1,250 mm Sheet thickness: 8 mm Punching force: 220 kN MACHINE DETAILS Operating hours: 51,658 h Dcsdpfx Ahey U U Npjgsi Machine weight: approx. 11,050 kg EQUIPMENT - TRUMPF Sheetmaster

Condition: ready for operation (used), Year of construction: 1998, operating hours: 30,430 h, functionality: fully functional, punching force: 22 t, sheet thickness (max.): 6 mm, travel distance X-axis: 2,500 mm, travel distance Y-axis: 1,250 mm, punching diameter: 76 mm, TECHNICAL DETAILS Pressing force: 220 kN Sheet metal thickness - max.: 6.4 mm Punching diameter: 76.2 mm Travel distance X-axis: 2,500 mm Travel distance Y-axis: 1,250 mm Positioning speed X-axis: 90 m/min Positioning speed Y-axis: 60 m/min Positioning speed (simulation): 108 m/min Positioning speed (rotary axis): 360 °/sec Workpiece weight: 150 kg Dcsdpfx Ahsy U U Edsgei Smallest programmable path dimension: 0.01 mm or 0.01° Tool stations: 15 Tool change time: 1.5 - 6.5 sec MACHINE DETAILS Dimensions: 6,400 x 5,800 x 2,100 mm Machine weight approx.: 11,050 kg Operating hours: 30,430 h

Condition: ready for operation (used), Year of construction: 2014, operating hours: 65,000 h, functionality: fully functional, punching force: 22 t, sheet thickness (max.): 8 mm, travel distance X-axis: 3,050 mm, travel distance Y-axis: 1,550 mm, workpiece weight (max.): 200 kg, Machine with SheetMaster TECHNICAL DETAILS Travel range of the X-axis during punching: 3,050 mm Travel range of the Y-axis during punching: 1,550 mm Sheet thickness: max. 8 mm Workpiece weight: max. 200 kg Punching force: max. 220 kN Stroke rates Dcedpey U Ut Iofx Ahgei Punching stroke rate at 1 mm: 1,350 min⁻¹ Marking stroke rate: 3,000 min⁻¹ Part removal Part size, part flap during punching: max. 500 x 500 mm Part size, fixed chute during punching with a moving table: max. 80 x 50 mm MACHINE DETAILS Operating hours: 65,000 h Space requirement: 7,395 x 6,540 x 2,072 mm Power consumption, auto-shutdown active: 0.5 kW Power consumption during production: 9.5 kW

Condition: ready for operation (used), Year of construction: 2008, operating hours: 59,000 h, functionality: fully functional, punching force: 18 t, working width: 1,270 mm, working height: 2,540 mm, punching diameter: 76 mm, sheet thickness (max.): 6 mm, TECHNICAL DETAILS Dedpfxey U Ub So Ahgeci Working area: 2,540 x 1,270 mm Punching force: 18 t Sheet thickness: max. 6.4 mm Workpiece weight: max. 150 kg Punching diameter: max. 76.2 mm Speed: max. 90/60/108 m/min Accuracy: 0.1 mm MACHINE DETAILS Control system: Bosch Type 3 Length: 5,500 mm Width: 5,900 mm Height: 2,200 mm Weight: 11,400 kg EQUIPMENT - Sturdy, easily accessible C-frame - Coordinate guidance for highly precise machining - Linear magazine with 19 tool stations - 2 clamping devices - Drives with maintenance-free AC servo motors - Follow-up device with programmable dwell function - Ball tables - Partial slide 180 x 200 mm - 2 finished parts containers - Chip container - Automatic shut-down

Condition: excellent (used), Year of construction: 2008, functionality: fully functional, Trumpf TruPunch 2020 Dodey S Adpopfx Ahgjci

Condition: excellent (used), Year of construction: 2007, functionality: fully functional, punching force: 20 t, 1 Used Amada EM 2510 NT Servo Electric Cnc Punch Press For Sale Make: Amada Model: EM 2510 NT Punching Force: 20 Tons (200 kN). Axis Travel (X/Y): 2500 x 1270 mm (expandable for larger sheets) with reposition Turret Configuration: Typically 45-stations with 4 Auto-Index stations. Control System: touchscreen control. Positioning Accuracy: Servo-Electric Drive: Replaces hydraulic systems with a, single AC servo motor (AE) or twin-drive (EM) system. This reduces energy consumption, eliminates oil changes, and minimizes maintenance. High Speed and Productivity: Capable of up to 900 hits per minute for marking, and 370 hits per minute on 1-inch centers. Dcsdpjyyck Sefx Ahgoi AMNC-F/3i Control: User-friendly, touchscreen interface for fast, error-free operations. Environmental Efficiency: The machine requires a low 19 kVA power hookup, drawing less than 5 kW at maximum power. Quiet Operation: Uses brush-type tables to reduce noise and prevent scratching on the underside of sheets. Tooling Efficiency: Features a "Triplet Track" turret and power vacuum die system to reduce tool changes and prevent slug pulling.

Condition: like new (used), Year of construction: 2012, operating hours: 47 h, MACHINE WITH ONLY 47 working hours. Tested by ERMAKSAN FRANCE. COMPLETE DATA CAN BE FOUND IN DOCUMENTS Djdpfjrcb Hqjx Ahgoci FANUC CONTROL

Condition: new, Year of construction: 2026, functionality: fully functional, D-T50 – CNC Turret Punch Press | Heavy Duty CNC Turret Punch Press – D-T50 | 500 kN | Sheet size 2500×1250 mm Heavy-duty CNC turret punching machine engineered for high-volume sheet metal fabrication. With a punching force of 500 kN and a stroke rate of 160 hits per minute, the D-T50 guarantees excellent productivity and precision. Key Specifications: • Capacity: 500 kN • Hit Rate: 160 strokes/min • Sheet Size: 2500 × 1250 mm • Max. Sheet Size (with single reposition): 5000 × 1250 mm • Max. Sheet Thickness: ≤ 6.35 mm • Accuracy: ± 0.1 mm • Feeding Speed: 80 m/min • Turret Stations: 16 / 24 / 32 • Air Pressure: 0.65 MPa • Machine Dimensions: 5000 × 5200 × 2300 mm ✅ High hit rate – ideal for mass production ✅ Extended sheet capacity with repositioning up to 5000 mm ✅ CE certified | Warranty included | Spare parts & service available D-Y80 – CNC Turret Punch Press | Heavy Duty | Thick Plate CNC Turret Punch Press – D-Y80 | 800 kN | Thick Plate up to 15 mm Heavy-duty CNC turret punching machine designed for processing thick sheet metal. The D-Y80 accommodates material up to 15 mm thick, delivering 800 kN punching force — perfect for structural and heavy-gauge tasks. Key Specifications: • Capacity: 800 kN • Hit Rate: 100 strokes/min • Sheet Size: 2000 × 800 mm • Max. Sheet Thickness: 6–15 mm • Accuracy: ± 0.15 mm • Feeding Speed: 60 m/min • Turret Stations: 6–12 • Air Pressure: 0.65 MPa • Machine Dimensions: 4100 × 4000 × 2400 mm Dedpfx Ahoy Swn Negoci ✅ Exceptional punching force – specialist for heavy-gauge sheet metal ✅ Robust design for demanding industrial applications ✅ CE certified | Warranty included | Spare parts & service available

Condition: good (used), Year of construction: 2009, operating hours: 44,287 h, functionality: fully functional, X Working area max.: 2500 mm Y Working area max.: 1250 mm Operating hours: 44,287 hours Control system: Bosch PNC-P Standard equipment: Machine - Stable, easily accessible C-frame - Coordinate guide for high-precision machining - Linear magazine with 18 tool positions including 2 clamps - Drives with maintenance-free three-phase motors - Reloading device with programmable hold-down device Dcodpfx Asy Sathehgoi - Ball tables - Part chute 180 x 150 mm - Automatic shut-off Punching head - Hydraulic punching head - Rotatable mono-tool holder - Programmable hold-down device - Tool length compensation - Punch spray lubrication - Punch slug extraction - Forming Control system - Open control system based on Bosch PNC-P - Control panel with 15" TFT color screen - Program management - Integrated Technology Data - Teleservice Data Transfer - USB Interface and Network Connection Safety - CE Marking - Multi-Beam Light Barriers - Hydraulic Quick Shutdown + Multitool Function + MultiShear Function + MultiBend Function + Thread Forming Function + Marking/Fast Beading Function + Deburring and Rolling Technology Function + Soft Punch Function + Movable Support Table + Part Slide Sensor + Vibration-Dampened Installation + 2nd Stop Pin + Bow Detection

Condition: excellent (used), Year of construction: 2000, Used Trumpf Trumatic 200r CNC punch press for sale: Brand: TRUMPF Model: TRUMATIC 200 Year: 2000 Type: CNC Punching Machine Control:Bosch CC 220 Punching force (ton) 16.5 Movement X-axis (mm) 80 m/min Dcedpsvq N Ndjfx Ahgsi Movement Y-axis (mm) 55 m/min Simultaneous positioning speed (X+Y m/min) 97 m/min Max. sheet thickness (mm) 6.4 Tool changing time (sec.) 1.5-6.5 s Number of tool places 15 Max. hole diameter (mm) 76.2Max. workpiece weight (kg) 150 Max. stroke rate (1/min) 420 Picture of punch samples: 6mm aluminium

Condition: excellent (used), Year of construction: 2001, Used High Quality, Very Clean and Fully Serviced Large Format Amada Vipros King 368 Cnc Punch Press For Sale Complete With 1600 Throat To Process 3metre x 1.5metre Sheet Metal year 2001 price POA specification 30 TONS CAPACITY 58 STATION 4 AUTO-INDEX HYDRAULIC CNC PUNCH PRESS COMPLETE WITH LKI MP3000 LOAD -UNLOAD MANILPULATOR description CAPACITY 30 TONS TYPE BRIDGE FRAME SERVO CONTROLLED HYDRAULIC RAM BRIDGE FRAME SERVO CONTROLLED HYDRAULIC RAM CONTROL FANUC 18P MAX AXIS TRAVEL 1525 X 2000 MAX SHEET SIZE 1525 X 4000 MAX SHEET THICKNESS 3.2MM 58 STATIONS THICK (H) 24 x 12.7 mm 24 x 31.7 mm 4 x 50.8 mm 1 x 88.9 mm AUTO-INDEX STATIONS 2 X 31.7mm 2 X 114.9mm MAX SHEET WEIGHT 150 KG 120 KG AT MAX SPEED MAX HIT RATE 860 STROKES PER/MIN POWER AND AIR REQUIRED 30 KVA 400V +/- 10%50 Hz AIR 5.0 kgf/cm/2 AIR FLOW 250 L/MIN COOLING WATER FLOW Min 40 1/min WEIGHT 14000kg SERIAL NO. MAX SHEET SIZE 3000mm X 1500mm MIN SHEET SIZE 1000 MM X 300mm SHEET THICKNESS RANGE 0.5mm – 6.0mm MAX LIFT CAPACITY 170 KG WITH DOUBLE SHEET DETECTION MAX PALLET LOAD 3000KG POWERAND AIR REQUIRED 10 KVE AIR 6 BAR FLOW RATE 650L/MIN Dcsdpfxjr D R Rus Ahgsi