<JAPAN> Precision Rotary Surface Grinding Machine PRG Series

Precision Rotary Surface Grinding Machine PRG Series OKAMOTO MACHINE TOOL WORKS, LTD. 2993 Gobara, Annaka, Gunma, Japan 379-0135 TEL : +81-27-388-9595 FAX : +81-27-385-1144 URL : www.okamoto.co.jp *Prior to and while using our products you are requested to thoroughly go through the articles on danger, warning and attention for the sake of safety described in oper- ation manual attached to the machine and also in the warning plates mounted on the machine. *When the products fall under the export controlled goods stipulated in “Foreign Exchange and Foreign Trade Act”, it requires the license or approval of Government of CAUTION Japan when exporting out of Japan. *Specifications subject to change without notice. Printed in Japan in November 2019 2019111000MTR-0

Ultra Precision High Productivity High Effi ciency Precision Rotary Surface Grinding Machine PRG Series CONTENTS Rotary surface grinding machines have more than twice the productivity Contents ……………………………………………… 1～2 Product Line-up ……………………………………… 3～4 compared to reciprocating surface grinding machines. Construction and Features ……………………… 5～6 Examples of Test Grinding ………………………… 6 Achieving better stability & higher accuracy due to the highly rigid Specifi cations ………………………………………… 7 Standard Accessories & External Views ………… 8 construction, we can control infeeds as low as 0.1um. Optional Accessories ……………………………… 9 Examples of Workpieces …………………………… 10 Universal & Multi-Step Exotic & Diffi cult To Cut Materials Mass Production & Automation Capabilities 1 PRG Series PRG Series 2

Since the chuck rotates in the rotary surface grinding machines, cycle time is reduced to Precision Rotary Surface Grinding Machine Series half or less compared to the reciprocating surface grinding machines. With double-column structure, it endures heavy workpieces and guarantees high accuracy and longevity. Conventional type PRG-DX Series NC PRG-DXNC Series NC Large Capacity PRG10/12DXNC Series ■Equipped with automatic cycle function of "coarse ■Fully featured graphical interactive software supports ■Table can be tilted. Ideal for grinding tapered workpieces grinding -> fine grinding -> spark-out -> stop at automatic dressing during grinding cycle. with angles and blade shaped workpieces. workpiece peripheral end". ■Up to 4 steps can be ground using the graphic ■Chuck modifi cation is available for grinding ceramics and ■The stoke limits of the outer and inner peripheral ends interactive software, between either traverse or plunge diffi cult-to-cut materials. of the workpiece is set by jog feed teaching positions. grinding cycles. ■Standard wheel size is increased to φ510 × 50 × φ127 for ■Minimum ver t ical feed ■Automation ready for high productivity in combination high-effi ciency grinding. setting increment is 0.1 μm. with measuring devices such as touch probe. ■Double-column structure ■Variable feed speed function controls the grinding is used to maintains high amount, keeping it constant regardless of the position r i g i d i t y a n d ma c h in e of the wheel over the rotary table. accuracy. PRG12DXNC PRG6DX Hydrostatic table guideway model Photo shown with optional accessories. Photo shown with optional accessories. PRG8DXNC Hydrostatic spindle modell Photo shown with optional accessories. Small type Large type Ultra Precision UPR3NC Ultra Precision UPR180NC ■Utilizing variable hydrostatics for the guideway of ■Years of experience in ultra-precision grinding table and air bearings. The rotation table drive can technology of the double-column grinding machines meet the requirements for parallelism and fl atness and rotary grinding machines allow of high quality of 0.3 μm. products. ■Ultra-precision model with minimum infeed setting ■High rigidity variable hydrostatic slide is used for the of 0.01 μm crossrail. ■Table rotation spindle uses hydrostatic system to maintain high accuracy. UPR3NC UPR180NC Photo shown with optional accessories. Photo shown with optional accessories. 3 PRG Series PRG Series 4

Precision Rotary Surface Grinding Machine PRG Series Fully featured graphic DXNC interactive software Construction and Features Graphical display thorough- ly supports your data input. 1. Initial Setting Input wheel dimensions. Original double-column structure that supports Multi-step grind- Rotary grinding is ideal for mass production of Standard DXNC Feature stable feed and high-precision grinding ing up to 4 steps fl at surface grinding of round workpieces Comparison between rotary Double-column structure is utilized for high Since the table does not shift, the operator 4 steps maximum can be ground using grinding and surface grinding rigidity during the wheel movement. can work without changing their position. the graphic interactive software, interac- 2. Selection of Workpiece Shape Unlike other rotary grinding machines, the In addition, the height to the top of the tive software, between either traverse or Select the number of steps (4 steps max). table does not move up and down or back chuck is low due to the structure, and the plunge grinding cycles. wheel and forth, resulting in better operability workpiece can easily be positioned or re- and improved accuracy. moved. wheel 1 step 2 steps on Rotary Grinding Machine on Reciprocating Grinding Machine φ400mm（Bore 300 mm）　 φ400mm（Bore 300 mm）　 3. Selection of Grinding Standard grinding allowance: 0.5 mm grinding allowance: 0.5 mm Select the workpiece datum or chuck da- Coarse 0.45mm 5 min Coarse 0.45mm 30 min tum as “0” point of dimension input. Fine & Spark Out Grinding 0.05mm 8 min Fine & Spark Out Grinding 0.05mm 33 min 3 steps Total 13 min Total 63 min Increased productivity with automatic cycle 4 steps DX Wheel spindle for vertical and cross feed High rigidity double-column Height to top of the chuck Blue color shows areas ground structure built for longevity PRG-DXN……………800mm Equipped with automatic cycle function of “coarse grinding ->fi nd grinding -> spark-out -> stop 4. Selection of Grinding MethodSelect traverse or plunge cycle. at workpiece peripheral end” Possible to change the settings of downfeed by step infeed amount, table rotation speed, total remaining grinding allowance and variable speed even during automatic cycle. Fixed Variable feed speed Grinding with tilted ta- Automatic Grinding Cycle Standard Standard stabilizes the grind- Standard ble allows for a wide dressing point ing conditions range of applications Stop at Start of Coarse Fine Spark-out Workpiece automatic (Rough) Grinding (0 - 5 times) Peripheral infeed Grinding End By fi xing the dressing point, we can elim- As the wheel strokes from the outer diam- With a simple operation, the table can be Rapid Feed Rapid Feed inate inconsistencies and misalignments eter to the center of the table, the table tilted ± 5˚ maximum, making it ideal for Both Ends Infeed caused by regular environmental chang- rotation speed increases, while the wheel grinding cylindrical taper shaped parts. Outside Peripheral End Infeed 5. Input of Grinding Conditions Interruptions from M.P.G. and dress inter- es, allowing us to achieve high-precision feed speed also increases, and the grind- rupt during cycling is also available. grinding. ing amount remains constant regardless of the position of the wheel over the rotary table. Chuck Coarse FineInfeed Infeed Operation which DX uses manual input 6. Setting Confi rmation Confi rmation of input data ±5° ■Effi ciency is established by the manual interruption function during the automat- “PRG-6” next to 5 degree ic cycle. "PRG-8” next to 3 degree ■Wheel spindle vertical and cross feed is controlled by our original LSI control Table-mounted dresser Processing mass-volume work- system and AC servo motor. Minimum pieces with constant accuracy setting unit is 0.1 μm DX series operation panel 5 PRG Series PRG Series 6

Specifi cations Standard Accessories CNC Rotary Surface Grinding Machine Rotary Surface Grinding Machine CNC Rotary Surface Grinding Machine Rotary Surface Grinding Machine Item Unit PRG6DXNC PRG8DXNC PRG10DXNC PRG12DXNC PRG6DX PRG8DX Item PRG6DXNC PRG8DXNC PRG10DXNCPRG12DXNC PRG6DX PRG8DX O.D. of Electromagnetic Chuck mm 600 800 1000 1200 600 800 GRIND-X Wheel Working Diameter of Electromagnetic Chuck mm 552 752 930 1130 552 752 Grinding Wheel Adaptor Maximum Travel of Wheel mm 750 950 1600 750 950 Distance from Electromagnetic ChuckCapacity Using 355 mm Wheel (50Hz) mm −60 250 − −60 250 Top of the Table Chuck Interlock Using 305 mm Wheel (60Hz) mm −35 275 − −35 275 to Bottom of the Automatic Demagnetizing Controller, Adjustable Chuck Power Wheel Using 510 mm Wheel mm − 500 − Short Circuit Breaker Table Load Capacity (not including chuck) kg 150 250 1200 1300 150 250 Color LED 8.4" Rotation Speed (constant speed control, CVT) min−1 20 150 15 130 8 65 20 150 20 130 Table Splash Cover, Semi-Closed Style Tilting Angle deg ±5 ±3 ±0.4 ±5 ±3 Table Mounted Dresser, Fixed Type Driven By AC Servo Motor Necessary Tools Cross Travel Distance mm 450 550 860 450 550 Feed Speed Anchor BoltSetting Range 0 2000 (Volume) 200 - 2400 during Auto- mm/ Leveling Bolts and Plates Override Max 2000 (0 - 150%) − matic Opera- min Wheel Head Program Memory Capacity 512KB tion Rapid Feed 4000 5000 − Cross Feed Display of Operation Time and Workpiece Qty (to be input in present location of LCD display) (X axis) Feed per Handwheel Revolu- tion ×1/×10/×100 mm 0.01/0.1/1.0 ×1/×10/×100 0.1/1.0 ×1/×10 Spindle invertor Manual Pulse Feed per Handwheel Gradua- 0.0001/0.001/0.01 ×1/×10/×100 Fanuc Color LED Display - 8.4 tion ×1/×10/×100 mm 0.001/0.01 ×1/×10 Feed Jog Feed (16 steps) mm/ 0 2000 200 2400 Rapid Feed min 4000 5000 − External View Driven By AC Servo Motor Cross Travel Distance mm 310 620 310 PRG6DXNC/8DXNC Feed Speed Setting Range 0 2000 − Dimensions in parentheses during Auto- mm/ Override Max 2000 (0 - 150%) − are of PRG8DXNC. Coolant System (with Separator) matic Opera- min Wheel Head tion Rapid Feed 4000 2000 − Vertical Feed (Z axis) Feed per Handwheel Revolu- tion ×1/×10/×100 mm 0.01/0.1/1.0 Manual Pulse Feed per Handwheel Gradua- tion ×1/×10/×100 mm 0.0001/0.001/0.01 Feed Jog Feed (16 steps) mm/ 0 2000 − Rapid Feed min 4000 2000 400/800 1665(1810) 925(1060) 1820(2120) Grinding O.D. x W x B (50Hz/60Hz) mm 355/ 305×38 max50 × 127 510×50 OP: max75)× 127 355/ 305×38 max50 × 127 2218(2363) Wheel Rotation Speed (50Hz/60Hz) min−1 1500/1800 1000/1200 1500/1800 PRG10DXNC/12DXNC For Wheel Spindle 11 7.5 7.5 For Rotary Table Drive 2.2 3.7 7.5 2.2 3.7 For Vertical Feed (AC Servo Motor) 3.0 1.8 0.75 Motor kW For Cross Feed (AC Servo Motor) 1.6 1.8 0.75 For Slideway 0.1 2.2 0.1 Coolant Lubricant System For Collecting Table Lubricant 0.04 − 0.04 CT-30M Power Supply Power Consumption kVA 31 34 35 20 23 Distance from Floor to Top of the Chuck mm 800 1260 800 Width x Depth x Height (including coolant 1665×3250 1810×3450 1665×3025 1810×3450 Floor Space mm 5135×4300×3581 system) ×2576 ×2616 ×2576 ×2616 Weight Net Weight kg 4000 5000 12800 13000 4000 5000 *Power consumption and fl oor space etc. may vary depending on the specifi cations & options. 1710.4 1290 3915.73180 CNC Ultra Precision Rotary Surface Grinding Machine Item Unit PRG6DX/8DX UPR3NC UPR180NC Coolant System (with Separator) Dimensions in parentheses Chuck O.D. mm 300 1800 are of PRG8DX. Maximum Travel of Wheel mm 400 2000 Distance from Floor to Top of the Chuck mm 205 600 Table Load Capacity kg 180 1000 Table Rotation Speed min−1 10～300 5～50 Tilting Angle deg ±0.3 ±0.15 1665(1810) 925(1060) 1820(2120) Net Weight kg 2500 45000 2218(2363) 7 PRG Series PRG Series 8 4300 3915.7 1785.4 2443(2931) 2560(2931) 3025(3450) 3250(3450) 1700 1700 30 2546 30 2546 2576 2576 1700 45 2000 2045 800 118～428 1260 75～775 800 118～428 2486(min2176) 2533(min2223) 3581 45

Optional Accessories Example of Workpieces CNC Rotary Surface Grinding Machine Rotary Surface Grinding Machine PRG6DXNC PRG8DXNC PRG10DXNCPRG12DXNC PRG6DX PRG8DX 1. Coolant System 1 Coolant System with Magnetic Dust Separator 2 Coolant System with Magnetic Dust Separator, with Paper Filter 3 Coolant System with Magnetic Dust Separator, with Automatic Coolant Temperature Regulator 4 Oil Mist Collecter 5 Dust Collection Hood for Oil Mist Collecter 2. Wheel Balancer 1 BW-360 with Balance Arbor − 2 BW-500 with Balance Arbor − − − − 3. Micro-Balancer Wafer Thin Workpieces & Blades 4. Spare Grinding Wheel Adaptor We have experiences in grinding silicon, SiC, glass Diffi cult thin workpieces can be ground without warping. 5. Spare Grinding Wheel Adaptor for Micro-Balancer and quartz. 6. Crane for Wheel Adaptor − − − − 7. Overhead Dresser, Hydraulic − − − 8. 2-direction Dresser (for OD, side-front dressing) − − 9. Power Up of Wheel Spindle, 11kW − − − 10. Power Up of Wheel Spindle, 15kW − − 11. Spindle invertor for 11kW − − − 12. Spindle invertor for 15kW − − 13. Wheel Spindle Meter Relay (emergency stop by spindle overload) 14. Table Rotation Speed Meter 15. Automatic Oil Temperature Regulator 16. Constant Coolant Supply for Table Drain Gutter 17. Manual Interruption (M.P.G. Interruption) − − 18. Timer of Accumulated Time 1 Display of Accumulated Time of Hydraulic "ON" − − 2 Display of Accumulated Time of Wheel Spindle "ON" − − Gear & Multiple Diameter Workpieces Ceramics 19. Auto Shut Down Function − − Suitable for mass production equipment and can grind Ideal for grinding brittle materials due to its rigid dou- 20. Signal Tower 3 Colors (on/off type, fl ashing type) − − multiple workpieces in one cycle. ble column construction 21. Calendar Timer (weekly timer, hydraulic "ON") − − 22. Work Light 23. GRIND-X Hydraulic Oil (to be used as lubricant) Complex Workpiece Ultra Precision Spacer (UPR3NC) GRIND-BIX Model Raised Table Cover 300 mm CE Mark Complied Workpiece that has corrugated shape in the center Small workpieces that require ultra-precision fl atness, can be easily ground by CNC model. such as bearing spacers for high-speed spindles can be ground. Overhead Dresser Dust Collection Hood & Hose Oil Mist Collecter Steps Bearings Workpiece with multiple steps can be easily ground Ideal for mass production of various bearing parts. using the interactive software. Work Light Wheel Balancer Touch Probe 9 PRG Series PRG Series 10