Solid carbide thread milling cutters

Transcription

1 SECIAL OFFER NEW rogramming software for thread milling cutters and drill thread milling cutters CNC Gühro ThreadMill Thread milling cutters with and without chamfer Universal thread milling cutters Drill thread milling cutters Micro-thread milling cutters Thread milling cutters for hardened steels Solid carbide thread milling cutters GUHRING YOUR WORLD-WIDE ARTNER

2 CNC Gühro ThreadMill Free programming software for thread milling cutters and drill thread milling cutters In order to make the machining with Guhring thread milling cutters even more user friendly, we have developed the intuitive CNC Gühro Thread Mill. CNC Gühro Thread Mill is available free-ofcharge. Simply download it from our homepage To the optimal CNC programme in five steps 1. Specify the thread data Select from all current thread standards 2. Select the material You are always referred to the optimal parameters 3. Select the tool Technical data, drawing, machining time and video simplify selection 4. Record CNC data Enter required milling strategy and parameters 5. Receive CNC programme with code and data sheet rogramming data (Sinumerik, Haidenhain, Fanuc, hilips, Mazatrol or Hurco) are imported and automatically recognised

3 TM S Thread milling cutters without chamfer NEW with HB clamping surface Simple option for thread milling one thread size Thread types: M, MF, UNF, UNC, NT, G p. 8 NEW with HB clamping surface TMC S Thread milling cutters with 45 chamfer High productivity thanks to countersinking and thread milling with one tool, high running smoothness and low lateral forces. Thread types: M, MF, G p. 18 NEW with HB clamping surface TMU S Universal thread milling cutter with recessed neck For different thread sizes with equal pitch, i.e. thread M30x1.5, milling cutter Ø12xM1.5, Ø16xM1.5 or Ø20xM1.5 Thread types: M, MF, G, NT, M / MF, for external threads, UN p. 24 DTMC S Drill thread milling with 2 flutes and 45º chamfer High productivity thanks to drilling, countersinking and thread milling one thread size with only one tool. Application only in aluminium, cast iron (GG-GGG), brass and plastics. Thread types: M p. 32 MTM S Micro-thread milling cutters p. 36 MTM 3 S Thread size and pitch are predetermined (3xD) M1.6 M16, G1/8 - G2, UNC, UNF, UNJC, UNJF, MJ, sol. carb. TiCN MTM 1 S Universal production of nominal thread diameters up to maximum pitch (3xD) M1.4 M10, solid carbide TiCN MTMH 3 S Machining of hardened steels from 45 HRC 65 HRC (2xD 3xD) M2 M12, solid carbide TiAlN TECHNICAL SECTION p. 45

4 Thread depth 2xD 2.5xD 2xD Tool material Solid carbide Type TM S TM S TM S TM S TM S TM S TMC S TMC S Surface THROUGH HOLES AND BLIND HOLES Coolant delivery axial axial axial axial axial axial Shank form HA HB HA HB HA HB HA HB Spiral Thread type Guhring no. / page M MF UNC UNF G NT EG M EG-threads can be produced with every thread milling cutter type and dimension MJ UNJC UNJF Suitable lubricant / / / / / / / / = Air = Neat oil = Soluble oil =dry Detailed cutting values see p. 60 4

5 universal 3xD 2xD 2.5xD Solid carbide TMU S TMU S TMU S TMU S MTM 3 S MTM 1 S MTMH3 S DTMC S DTMC S DTMC S A axial axial axial axial radial radial HA HB HA HB HA HA HA HA HA HA for external threads for external threads universal hard machining Guhring no. / page EG-threads can be produced with every thread milling cutter type and dimension / / / / / / / / / / 5

6 Burr-free thread machining at the thread intake no problem for Guhring s thread milling cutters roblem: Burr-formation at the thread entry (Brittle burrs, bird s nest) Solution: Special tool with relief-ground de-burring edge Result: Burr-free thread entry in one operating step lease contact us to work out special solutions.

7 SECIALTHREADMILLINGCUTTERS Despite a broad standard range it does not include the correct tool? Then we are more than happy to provide a tool optimally adapted to your machining task as a special solution. lease contact us!

8 TM S Thread milling cutters without chamfer 8

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10 Thread milling cutters without chamfer Thread milling cutters without chamfer for ISO metric threads 2xD Tool material Solid carbide Surface Type TM S TM S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H without chamfer D d2 d1 l 1 l 2 60 d k Guhring standard Guhring no D d1 d2 dk l1 l2 Z Code no. mm mm mm mm mm mm Availability M M M8 x M M10 x M10 x M M12 x M M14 x M M16 x M M20 x

11 Thread milling cutters without chamfer Thread milling cutters without chamfer for ISO metric threads 2xD Tool material Solid carbide Surface Type TM S TM S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H without chamfer D d2 d1 l 1 l 2 60 d k Guhring standard Guhring no D d1 d2 dk l1 l2 Z Code no. mm mm mm mm mm mm Availability M M M M M M M

12 Thread milling cutters without chamfer Thread milling cutters without chamfer for ISO metric threads Tool material Solid carbide 2,5xD Surface Type TM S TM S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H without chamfer D d2 d1 l 1 l 2 60 d k Guhring standard Guhring no D d1 d2 dk l1 l2 Z Code no. mm mm mm mm mm mm Availability M M M M M M M

13 Thread milling cutters without chamfer Thread milling cutters without chamfer for UNC-threads 2xD Tool material Solid carbide Surface Type TM S TM S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H without chamfer D d2 d1 l 1 l 2 60 d k Guhring standard Guhring no D d1 d2 dk l1 l2 Z Code no. mm mm mm mm mm Availability / / / / / / /

14 Thread milling cutters without chamfer Thread milling cutters without chamfer for UNF-threads 2xD Tool material Solid carbide Surface Type TM S TM S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H without chamfer D d2 d1 l 1 l 2 60 d k Guhring standard Guhring no D d1 d2 dk l1 l2 Z Code no. mm mm mm mm mm Availability / / / / / / /

15 Thread milling cutters without chamfer Thread milling cutters without chamfer for NT-threads Tool material Solid carbide Surface Type TM S TM S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H without chamfer D d2 d1 l 1 l 2 60 d k Guhring standard Guhring no D d1 d2 dk l1 l2 Z Code no. G/inch mm mm mm mm mm Availability 1/ / / /

16 Thread milling cutters without chamfer Thread milling cutters without chamfer for BS-threads 2xD Tool material Solid carbide Surface Type TM S TM S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H without chamfer D d2 d1 l 1 l 2 d k Guhring standard Guhring no D d1 d2 dk l1 l2 Z Code no. G/inch mm mm mm mm mm Availability G1/ G1/ G3/

17 Thread milling cutters our precision for your success ut us to the test! Quality from the manufacturer own R&D and machine construction division for uniform quality standards high process reliability with detailed documentation guaranteed repeatability and thread quality detailed inspection protocols on customer request

18 TMC S thread milling cutter with 45 chamfer 18

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20 Thread milling cutters with chamfer Thread milling cutters with chamfer for ISO metric threads 2xD Tool material Solid carbide Surface Type TMC S TMC S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H with chamfer 45 D d2 d1 d3 l 3 l 2 l 1 60 d k Guhring standard Guhring no D d1 d2 d3 dk l1 l3 l2 Z Code no. mm mm mm mm mm mm mm mm Availability M M M M M M M M M M

21 Thread milling cutters with chamfer Thread milling cutters with chamfer for ISO metric fine threads 2xD Tool material Solid carbide Surface Type TMC S TMC S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H with chamfer 45 D d2 d1 d3 l 3 l 2 l 1 60 d k Guhring standard Guhring no D d1 d2 d3 dk l1 l3 l2 Z Code no. mm mm mm mm mm mm mm mm Availability M 4 X M 5 X M 6 X M 6 X M 8 X M8 x M10 x M10 X M12 x M12 X M14 X M16 X

22 Thread milling cutters with chamfer Thread milling cutters with chamfer for BS-threads 2xD Tool material Solid carbide Surface Type TMC S TMC S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H with chamfer 45 D d2 d1 d3 l 3 l 2 l 1 55 d k Guhring standard Guhring no D d1 d2 d3 dk l1 l3 l2 Z Code no. G/inch mm mm mm mm mm mm mm Availability G1/ G1/ G3/

23 HC clamping chucks Robust, compact and accurate the optimal clamping chuck for thread milling Guhring also provides precision clamping chucks with maximum clamping force for thread milling operations. A special clamping sleeve is clamped via worm gear and optimally transfers an enormous clamping force to the clamped tool. High clamping force with maximum rigidity, vibration-free machining Concentricity accuracy 3ųm with 2.5xD Tool life increase of up to 40% contributes to considerable cost savings Flexible application with GUHROJET clamping sleeves, also available with peripheral cooling Very simple handling with maintenance-free technology

24 24 TMU S Universal thread milling cutters

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26 Universal thread milling cutters Universal thread milling cutters for ISO metric threads Tool material Solid carbide Surface Type TMU S TMU S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H universal thread milling cutters for internal threads M / MF D d2 d1 l 1 l 5 l 2 60 Company std. Article no D d1 d2 l1 l5 l2 Z Code no. mm mm mm mm mm mm Availability > > > > > > > > > > > > > > > > >

27 Universal thread milling cutters Universal thread milling cutters for BS-threads Tool material Solid carbide Surface Type TMU S TMU S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H Universal thread milling cutters for internal and external threads D D d2 d1 l 1 l 5 l 2 55 Company std. Article no D d1 d2 l1 l5 l2 Z Code no. G/inch mm mm mm mm mm Availability > 1/ > 1/ >

28 Universal thread milling cutters Universal thread milling cutters for UN-threads Tool material Solid carbide Surface Type TMU S TMU S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H Universal thread milling cutters for internal threads D d2 d1 l 1 l 5 l 2 60 Company std. Article no D d1 d2 l1 l5 l2 Z Code no. G/inch mm mm mm mm mm Availability > 1/ > 5/ > 5/ > 11/ > 5/ > 7/ > 7/ > 7/ > 13/ > > > >

29 Universal thread milling cutters Universal thread milling cutters for NT-threads Tool material Solid carbide Surface Type TMU S TMU S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H Universal thread milling cutters for internal and external threads D D d2 d1 l 1 l 2 60 Company std. Article no D d1 d2 l1 l2 Z Code no. G/inch mm mm mm mm Availability > 1/ >

30 Universal thread milling cutters External thread milling cutters Tool material Solid carbide Surface Type TMU S TMU S Cutting data page 60 Internal cooling M Shank form HA HB K NEW N S H Universal thread milling cutters for external threads M / MF D d2 d1 l 1 l 5 l 2 60 Company std. Article no D d1 d2 l1 l5 l2 Z Code no. mm mm mm mm mm mm Availability

31 DTMC S High-performance drill thread milling cutter for aluminium, cast materials and plastics. An overview of the advantages Drilling, countersinking and thread milling with only one tool no tool change required Reduction of main and ancillary times Saving of tool positions for though holes and blind holes

32 32 DTMC S Drill thread milling cutters

33 Thread cross-section produced by a drill thread milling cutter, the recess is typically generated by the circulation during the machining operation Recess 33

34 Drill thread milling cutters Drill thread milling cutters for ISO metric threads 2xD Tool material Solid carbide Surface Type DTMC S DTMC S Cutting data page 60 Internal cooling M Shank form HA HA K N S H 45 l 4 G d2 140 d1 dk d3 l 3 l 5 l 1 60 dk Guhring standard Guhring no D d1 d2 d3 dk l1 l3 l4 l5 Z Code no. mm mm mm mm mm mm mm mm mm Availability M M M M M M M M M

35 Drill thread milling cutters Drill thread milling cutters for ISO metric threads Tool material Solid carbide 2,5xD Surface Type DTMC S Cutting data page 60 Internal cooling M Shank form HA K N S H 45 l 4 D d2 140 d1 dk d3 l 3 l 5 l 1 60 dk Guhring standard Guhring no D d1 d2 d3 dk l1 l3 l4 l5 Z Code no. mm mm mm mm mm mm mm mm mm Availability M M M M M M M M

36 36 MTM S Micro-thread milling cutters

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38 Thread milling cutters Micro-thread milling cutters 3xD Tool material Solid carbide Surface Type MTM3 S Cutting data page 60 Internal cooling M Shank form HA K N S H l 5 D d2 d1 l 1 l 2 60 Company std. Article no D d1 d2 l1 l2 l5 Z Code no. mm mm mm mm mm mm Availability M1, M1, M M2, M M3, M M M M M M M

39 Thread milling cutters Micro-thread milling cutters 3xD Tool material Solid carbide Surface Type MTM1 S Cutting data page 60 Internal cooling M Shank form HA K N S H l 5 D d2 d1 l 1 l 2 60 Company std. Article no D max. d1 d2 l1 l2 l5 Z Code no. mm mm mm mm mm mm Availability M1.4 - M M2 - M M2.5 - M M3.5 - M M5 - M M8 - M

40 Thread milling cutters Micro-thread milling cutters 3xD Tool material Solid carbide Surface Type MTM3 S Cutting data page 60 Internal cooling M Shank form HA K N S H Thread milling cutters for internal and external threads l 5 D D d2 d1 l 1 l 2 55 Company std. Article no D d1 d2 l1 l2 l5 Z Code no. G/inch mm mm mm mm mm Availability G1/16-G1/ G1/4-G3/ G1/2-G7/ G1-G

41 Thread milling cutters Micro-thread milling cutters 3xD Tool material Solid carbide Surface Type MTM3 S Cutting data page 60 Internal cooling M Shank form HA K NEW N S H l 5 D d2 d1 l 1 l 2 60 Company std. Article no D d1 d2 l1 l2 l5 Z Code no. G/inch mm mm mm mm mm Availability UNF No UNC No 1+UNF No UNC No 2+UNF No UNC No 3+UNF No UNC No UNC No 5+UNF No UNC No UNF No UNC No UNF No UNC No10+UNC No UNF No UNF 1/ UNC 1/ UNF 5/16+UNF 3/ UNC 5/ UNC 3/ UNF 7/ UNC 7/ UNF 5/

42 Thread milling cutters Micro-thread milling cutters 3xD Tool material Solid carbide Surface Type MTM3 S Cutting data page 60 Internal cooling M Shank form HA K NEW N S H with internal coolant UNJF 1/4 d2 l 4 d1 l 1 l 2 60 D Company std. Article no D d1 d2 l1 l2 l5 Z Code no. G/inch mm mm mm mm mm Availability UNJC No UNJC No 8+UNJF No UNJC No10+UNJC No UNJF 1/ UNJC 1/ UNJF 5/16+UNJF 3/ UNJC 5/16+UNJF 9/ UNJC 3/8+UNJF 3/ UNJF 7/ UNJC 7/16+UNJF 7/ UNJC 1/

43 Thread milling cutters Micro-thread milling cutters 3xD Tool material Solid carbide Surface Type MTM3 S Cutting data page 60 Internal cooling M Shank form HA K NEW N S H with internal coolant MJ5 d2 l 4 d1 l 1 l 2 60 D Company std. Article no D d1 d2 l1 l2 l5 Z Code no. mm mm mm mm mm mm Availability MJ MJ MJ MJ MJ MJ MJ MJ

44 Thread milling cutters Micro-thread milling cutters 3xD Tool material Solid carbide Surface A Type MTMH3 S Cutting data page 60 Internal cooling M Shank form HA K N S H for hard machining HRC l 5 D d2 d1 l 1 l 2 60 Company std. Article no D d1 d2 l1 l2 l5 Z Code no. mm mm mm mm mm mm Availability M M2, M M M M M M M

45 TECHNICAL SECTION The characteristics of different thread types geometry drawing Standard application M ISO-metric thread geometry drawing Standard application MF ISO-metric fine thread 60 DIN 13-1 General standard thread 60 DIN 13-2 to DIN General fine thread d2, D2 d2=d2 d2=d2 UNC Unified National Coarse thread UNF Unified National Fine thread 60 ASME B1.1 General UN standard thread 60 ASME B1.1 ISO-metric trapezoidal thread General UN Fine thread d2, D2 UNEF Unified National Extra Fine thread UNS Unified Special thread 60 ASME B1.1 General UN Extra Fine thread 60 ASME B1.1 General UN Special thread d2, D2 G Cylindrical ipe thread without thread sealing connections d2=d2 DIN EN ISO NT American Standard ipe Threads tapered for sealing ANSI/ ASME 1: B Threads for pipes, pipe connections and fittings pipe threads and fittings Rp Whitworth pipe thread cylindrical internal thread UNJ inch thread r r d2, D2 D2 DIN EN (based on ISO 7-1) Replacement for DIN ISO 3161 Internal thread for pipe threads and fittings (for in the thread sealing connections) For the aerospace industry D d R D2, d2 MJ thread metric thread D3 60 DIN ISO For the aerospace industry external thread internal thread D, d R D2, d2 play 45

46 TECHNICAL SECTION Taping size holes for thread milling cutters Std. ISO metric threads DIN 13 nom. pitch tapping core diameter Ø size of int. thread 6H* hole Ø DIN 336 min. max. mm mm mm mm M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M nom. x pitch tapping core diameter Ø size of int. thread 6H hole Ø DIN 336 min. max. mm mm mm mm M 2.5 x M 3.0 x M 3.5 x M 4.0 x M 4.5 x M 5.0 x M 5.5 x M 6.0 x M 7.0 x M 8.0 x M 8.0 x M 8.0 x M 9.0 x M 9.0 x M 10 x M 10 x M 10 x M 11 x M 11 x M 12 x M 12 x M 12 x M 14 x M 14 x M 14 x M 15 x M 15 x M 16 x M 16 x M 16 x M 17 x M 17 x M 18 x M 18 x M 20 x M 20 x M 20 x M 22 x ISO metric fine threads DIN 13 nom. x pitch tapping core diameter Ø size of int. thread 6H hole Ø DIN 336 min. max. mm mm mm mm M 22 x M 22 x M 24 x M 24 x M 24 x M 25 x M 25 x M 25 x M 27 x M 27 x M 27 x M 28 x M 28 x M 28 x M 30 x M 30 x M 30 x M 30 x M 32 x M 32 x M 33 x M 33 x M 33 x M 35 x M 36 x UNC threads ASME B1.1 nom. threads tapping core diameter Ø size of int. thread 2B hole Ø per DIN 336 min. max. inch mm mm mm No No No No No No No No No / / / / / / / / / / / / / / * M 1.1 up to M 1.4 tapping size hole of int. thread 5H MJ threads DIN ISO 5855 nom. x pitch tapping core diameter Ø size of int. thread 5H* hole Ø min. max. mm mm mm mm MJ 3 x MJ 4 x MJ 5 x MJ 6 x MJ 6 x MJ 6 x MJ 8 x MJ 8 x MJ 8 x MJ 8 x MJ 10 x MJ 10 x MJ 10 x MJ 12 x MJ 16 x UNJC threads ISO 3161 nom. threads tapping core diameter Ø size of int. thread 3B hole Ø per min. max. inch mm mm mm No No No No / / / / / / / UNJF threads ISO 3161 nom. threads tapping core diameter Ø size of int. thread 3B hole Ø per min. max. inch mm mm mm No No No No / / / / / / /

47 TECHNICAL SECTION Taping size holes for thread milling cutters UNF threads ASME B1.1 nom. threads tapping core diameter Ø size of int. thread 2B hole Ø per DIN 336 min. max. inch mm mm mm No No No No No No No No No / / / / / / / / / / / / / BSW (Whitworth) threads BS84 nom. threads tapping core diameter Ø size of int. thread hole Ø per min. max. inch inch mm mm mm W 1 / W 3 / W 1 / W 5 / W 3 / W 7 / W 1 / W 5 / W 3 / W 7 / W 1 / W 9 / W 5 / W 3 / W 7 / W W 1 1 / W 1 1 / W 1 3 / W 1 1 / W 1 5 / W 1 3 / W (Whitworth) threads (DIN-ISO 228-1) nom. threads tapping core diameter Ø size of int. thread hole Ø per DIN 336 min. max. inch inch mm mm mm G 1 / G 1 / G 1 / G 3 / G 1 / G 5 / G 3 / G 7 / G G 1 1 / G 1 1 / G 1 1 / G 1 3 / G Steel armoured conduit threads to DIN nom. threads tapping core diameter Ø size of int. thread hole Ø per min. max. inch mm mm mm g g g g g g g g g g NT ANSI B 2.1 American tapered pipe thread 1:16 Version A (avoid if possible) Version B nom. threads tapp. size hole Ø tapp. size hole Ø cutting depth cutting depth Ø per cylindrical (A) conical (B) ET BT (min) inch d 1 D 1 mm mm d 1 BT 1:16 D 1 ET d 1 BT 1 / / / / / / / / / Metric/metric fine EG-threads (EG M14 x 1.25) for wire thread inserts DIN 8140 nom. x pitch tapping core diameter Ø size of int. thread hole Ø min. max. mm mm mm mm EG M EG M EG M EG M EG M EG M EG M14 x EG M UNC (UNC-STI) EG-threads for wire thread inserts ASME B nom. threads tapping core diameter Ø size of int. thread hole Ø per min. max. inch mm mm mm EG No EG No EG No EG No EG 1 / EG 5 / EG 3 / EG 7 / EG 1 / EG 9 / EG 5 / EG UNF (UNF-STI) threads for wire thread inserts ASME B nom. threads tapping core diameter Ø size of int. thread hole Ø per min. max. inch mm mm mm EG No EG No EG No EG No EG 1 / EG 5 / EG 3 / EG 7 / EG 1 / EG 9 / EG 5 /

48 TECHNICAL SECTION The Guhring thread milling cutter types TM S thread milling cutter w/o countersink step Simple and cost-efficient tool for the milling of internal threads 2-3 thread sizes with the same pitch can be produced over the specified nominal dimension Application in materials 1000 N/mm 2 Available with or without internal cooling Thread types: M, MF, UNC, UNF, G, NT TMC S Thread milling cutter with 45º countersinking step Countersinking and thread milling with only one tool Very smooth running and low lateral forces Designed for the application of difficult-to-machine materials also available w/o countersinking step 2-3 thread sizes with the same pitch can be produced over the specified nominal dimension Only available with internal cooling Thread types: M, MF, G TMU S universal milling cutter with collar recess Universal application possibilities For various thread sizes with the same pitch, i.e. thread M30x1.5 with milling cutter Ø 12xM1.5, Ø 16xM1.5 or Ø 20xM1.5 Only available with internal cooling Thread types: M, MF, G, UN, NT and external thread M, MF, G DTMC S drill/thread milling cutter with 2 cutting edges and 45º chamfer Drilling, countersinking and thread milling with only one tool Resulting in reduced machining times and tool costs as well as reduced space requirements Application only in aluminium, cast materials, brass and plastics Available with or without internal cooling Thread types: M MTM 3 S micro-thread milling cutter Thread size and pitch are predetermined Excellent characteristics with high-tensile materials such as titanium, stainless steel etc. Suitable for the machining of hardened steel 45HRC-65HRC Threads up to 3xD Available with or without internal cooling Thread types: M, MF, G, UNC, UNF, MJ, UNJC, UNJF MTM 1 S micro-thread milling cutter Universal production of nominal thread diameters up to a maximum pitch Only available with internal cooling Thread types: M, MF 48

49 TECHNICAL SECTION Difference between taps/fluteless taps and thread milling cutters Taps/fluteless taps Thread milling cutter = pitch T = pitch The red lines show the pitch angle of the thread that is ground into the tool. This means the pitch is cut into the workpiece by the tool. The red lines show that the tool does not possess a pitch angle. The pitch is produced by the Z-axis of a CNC machine. Creation of the thread with thread milling CNC-axes CNC-axes Y Y X Z X Thread profile without axial feed (Z-axis) of the machine. A groove profile is created without pitch. A functioning thread is not created. Through the additional programming of the Z-axis the necessary pitch is produced. Note: Due to diagonal milling in the pitch angle (Z-axis) the thread profile of the tool is transferred onto the component distorted. The more the milling cutter diameter (80% of nom. Ø) approaches the nominal thread diameter and the higher the thread pitch the more pronounced the profile distortion is. 49

50 TECHNICAL SECTION Differentiating between two milling processes Reverse rotation milling clockwise, with G02 Synchronous milling anticlockwise, with G03 Reverse rotation milling is preferentially applied for the machining of harder materials or to remedy taper threads. Synchronous milling is applied with thread depths smaller than 1.5xD. Advantage: A better surface finish is achieved. Thread production with one tool Right-hand thread Reverse rotation milling Left-hand thread Reverse rotation milling Tool rotates clockwise from top to bottom Tool rotates clockwise from bottom to top Right-hand thread Synchronous milling Left-hand thread Synchronous milling Tool rotates clockwise from bottom to top Tool rotates clockwise from top to bottom 50

51 TECHNICAL SECTION Thread milling cutter modifications Illustration Modification Effect Cooling slots on shank Targeted cooling, without weakening the tool cross-section in the cutting edge area Radial coolant exits Targeted cooling with through hole threads Threads removed Reduced cutting forces but longer machining time because two cycles are required De-burring cutting edge Removing the incomplete threads at the thread run-in without additional operating step. First thread profile lengthened at the face Chamfering a tapping size hole Grinding collar Enables axial distribution of cuts useful for deep threads 51

52 TECHNICAL SECTION Thread milling programming rogram specifications Thread milling functions G00 Rapid movement G90 Absolute dimension G01 Feed G91 Incremental dimension G02 Circular interpolation (clockwise) M03 Spindle on (clockwise rotation) G03 Circular interpolation (anti-clockwise) M05 Spindle stop G17 Layer selection x-y axis M08 Coolant on G18 Layer selection z-x axis X Axis G19 Layer selection y-z axis Y Axis G40 Cancel tool correction Z Axis G41 Tool path correction (left of contour) I Thread pitch parallel to X-axis G42 Tool path correction (right of contour) J Thread pitch parallel to Y-axis G43 Tool length compensation (call-up) S Spindle speed G49 Tool length compensation (deselect) F Feed G54 Work offset CNC internal thread milling 1. Moving to start position 2. Moving to thread depth in bore (milling cutter) external path vf (milling cutter) centre point path vm descending loop to contour full circular movement of thread milling cutter exit loop to centre of bore d D 6. Rapid movement from bore to start position entry cycle 180 (always half feed rate) Y + X + Y + X + Y + X + Formula of calculation v c = d.. n 1000 n = v c d. v f = n. z. f z v m = v. (D - d) f D v b = n. f b v c = cutting speed v f = contour feed v m = centre point path feed n = revolutions z = number of teeth f z = feed per tooth f b = feed per drill per revolution* v b = drill feed rate* D = Ø nom. of thread [mm] d = milling cutter nom. Ø [mm] * for drill/thread milling 52

53 TECHNICAL SECTION Thread milling programming rogramming process for micro-thread milling (right-hand thread in reverse rotation) Starting point Tool starting position 180 entry cycle Thread milling 180 withdrawal cycle End position Y + Y + Y + X + X + X + ossibilities to reduce radial forces To reduce radial forces cut distribution can be undertaken: Advantage: - for larger thread depths - counteracts taper threads - for unstable clamping conditions Disadvantage: - increased tool wear - longer production time Axial distribution of cut Radial distribution of cut 2/3 1/3 1 st step reverse rotation milling 2 nd step reverse rotation milling 1 st step 2 nd step 1 st step 2 nd step 53

54 TECHNICAL SECTION Selecting the correct clamping chuck Correct tool clamping also plays a essential role with thread milling. Thread milling cutters should as a rule be clamped as short as possible. A compact and mechanical clamping force is preferable. The error in concentricity should not exceed 0.02 millimetres. ower chucks A power chuck excels thanks to extremely accurate concentricity. The high clamping forces and optimal smooth running are a perfect prerequisite for the production of threads in all materials including a high pitch. max. permissible error in concentricity: mm Side lock holders max. permissible error in concentricity: mm A side lock holder for HB and HE shanks is a robust, costefficient clamping chuck with a maximum clamping force. The clamping surface prevents the tool twisting or being pulled out during machining. Therefore, side lock holders are suitable for the production in all materials including a high pitch. Shrink fit chucks max. permissible error in concentricity: mm A shrink fit chuck creates a rigid connection with the shrink fitted tool. Incorrect shrink fitting or older shrink fit chucks can result in the pulling out of the tool. Tool breakage and possible loss of the component would be the consequence. Therefore, the shrink fit chuck is only suitable for a thread pitch < =1.5 mm. Hydraulic chucks A hydraulic chuck, similar to the shrink fit chuck, has only limited suitability for thread milling. Especially with high radial forces this clamping chuck reaches its limits. Therefore, the hydraulic chuck is recommended for softer materials such as aluminium and a thread pitch < =1.5 mm. max. permissible error in concentricity: mm Collet holders Collet chucks are very well suited for micro-thread milling because only axial stresses are created. The low clamping forces omly permit the milling of softer materials. Consequently, collet holders are not suitable for conventional thread milling. max. permissible error in concentricity: 0.01 mm 54

55 TECHNICAL SECTION ractical application of thread milling cutters 1.) Tool clamping: good concentricity is important, therefore clamping as short and rigid as possible 2.) Enter tool data in machine memory 1.) Tool length from the front face, take drill/thread milling cutters (DTMC) rom point. 2.) Measure tool radius with tool pre-setting equipment. General rule: measured radius x pitch provides the input value in machine memory. 3.) Input of CNC program in control (preferably integrated as sub-program at corresponding positions) a.) Call-up of a self-controlling cycle (procedures should be known) b.) Integration of data file from our threadmill-software (DIN or Haidenhain). 4.) Trial run over workpiece a) Tool length dimension in memory extending by an approximate value dependent on contact length (i.e. 30 mm) or offset zero point. b) Run program in single set, visual check of travel path. c) Allow program to run in automatic mode. Attention: With controls where it is not definitely clear what milling path is assigned it it must be clarified if the feed is positioned on the external path vf or at the centre path vm. As a rule we specify the milling centre point path vm. 5.) Application in workpiece Re-set the tool extension or the zero point. Then allow the program to run in the workpiece the feed regulation must be 100% selected. Should the thread not be true to gauge, the tool radius requires correction in the tool memory: Example: thread too tight: Radius correction input thread too large: Radius correction + input 55

56 TECHNICAL SECTION

57 TECHNICAL SECTION Maximum economic efficien thanks to refurbishing to original quality Even the most wear-resistant tool will wear sometime under heavy stresses. Thanks to the refurbishment to original geometries and coatings Guhring manages to reproduce the original performance of the tool Re-grinding In our service centres, tools are re-ground on the front rake face according to the degree of wear. According to width of wear marks the re-grind service is possible two or three times (from milling part diameter d1 > 5.0 mm). In order to re-define the milling portion diameter, the number of regrinds is indicated by a notch on the end of the shank. This means every notch is assigned to a diameter and re-etched. Re-coating If a thread mill was enhanced with a coating, the tool is re-coated following the re-grind. This way, not only the wearand corrosion-protection as well as the glide characteristics are re-produced but also the tool life prolonged. 57

58 NOTES 58

59 rogramming example for hardened steels rogramming example internal threads M6x(1) Material: Thread: Tapping size: Tool: Cooling: arameter: rocessing: Tool life: / HRC 62 M6x(1), deep 16.0 mm / blind hole Tapping size-ø 5.1 mm MTMH 3 S M, M6x(1) material-ø 4.8 mm Z=4 dry v c = 44 m/min, f z = 0.03 (reverse rotation milling) cut distribution in diameter 2/3-1/3 30 threads 59

60 CUTTING DATA Application recommendations thread milling cutters and micro-thread milling cutters ISO Material group Hardness Example materials Material no. M K N S H Structural/free-cutting steels, S235JR Unalloyed heat-treatable-/ case hardened < 800 N/mm² C steels 11SMnb Free-cutting steels, Unalloyed case hardened S355J N/mm² C steels, nitriding steels 31CrMo CrMo Alloyed heat-treatable steels, heat-treatable 36CrNiMo N/mm² steels, high speed steels X36CrMo HS X5CrNi M1 Stainless steel sulfured, austenitic < 1000 N/mm² X6CrNiTi X8CrNiS M2 Stainless and acid-resit. steel steels, X17CrNi < 1000 N/mm² X90CrMoV martensitic X2CrTi X2CrNiMoN M3 duplex and super duplex < 1300 N/mm² X2CrNiMoN X2CrNiMoCuWn EN-GJL K1 cast iron 300 HB EN-GJL EN-GJL EN-GJS K2 Spher. graph. iron and mall. cast iron 350 HB EN-GJS EN-GJS K3 ADI, GGV 1000 N/mm² EN-GJS EN-GJV HB EN-GJV400 Al99,5H N1 Aluminium and wrought alloys < 450 N/mm² AlMgSi AlZn4,5Mg GD-AlSi5Cu1Mg N2 Aluminium- cast alloys < 600 N/mm² GD-AlSi8Cu G-AlSi9Mg G-AlSi N3 Magnesium alloys < 500 N/mm² GDMgAl8Zn CuZn N4 Copper and copper alloys long-chipping CuZn37b0, short-chipping CuZn43b N5 Copper special alloys < 1400 N/mm² Ampco N6 lastics [ thermoplastics, duroplastics ] long-chipping MMA, OM,VC short-chipping Titanium S1 Titanium und titanium alloys < 1200 N/mm² TiAl5Sn TiAl6V Hasteloy C S2 Nickel, cobalt, iron alloys < 1400 N/mm² Inconel Nimonic H HRC Hardox High tensile steels, hardened steels H HRC M30 Application recommendations drill thread milling cutters 1.5xD, 2xD, 2.5xD ISO Material group Hardness Example materials Material no. K N EN-GJL K1 cast iron 300 HB EN-GJL EN-GJL EN-GJS K2 Spher. graph. iron and mall. cast iron 350 HB EN-GJS EN-GJS K3 ADI, GGV 1000 N/mm² EN-GJS EN-GJV HB EN-GJV400 Al99,5H N1 Aluminium and wrought alloys < 450 N/mm² AlMgSi AlZn4,5Mg GD-AlSi5Cu1Mg N2 GD-AlSi8Cu Aluminium- cast alloys < 600 N/mm² G-AlSi9Mg G-AlSi N3 Magnesium alloys < 500 N/mm² GDMgAl8Zn N4 Copper and copper alloys long-chipping CuZn20 CuZn37b0, short-chipping CuZn39b CuZn43b N5 Copper special alloys < 1400 N/mm² Ampco N6 lastics [ thermoplastics, duroplastics ] long-chipping MMA, OM,VC short-chipping ertinax lease note: The cutting values specified in the respective columns are guide values, they have to be adapted according to application conditions (material, lubrication, tool clamping, machine etc.) Depending on the machining task the optimal cutting values can differ from those in the table by up to +- 30%! 60

61 CUTTING DATA Type TM TMC TMU MTM3 MTM1 MTMH3 Cutting speed v c (m/min) Milling part diameter [ d1 ] / feed per tooth [ fz ] [ conventional milling ] Ø1 Ø2 Ø3 Ø4 Ø5 Ø6 Ø7 Ø8 Ø9 Ø10 Ø12 Ø14 Ø16 Ø18 Ø20 mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm x x Type DTMC DTMC Cutting speed v c (m/min) Thread size / drill feed [ fb ] / feed per tooth [ fz ] 1.5xD, 2xD / 2.5xD [ conventional milling ] M3 M4 M5 M6 M8 M10 M12 M14 M16 fb fz fb fz fb fz fb fz fb fz fb fz fb fz fb fz fb fz mm/rev mm mm/rev mm mm/rev mm mm/rev mm mm/rev mm mm/rev mm mm/rev mm mm/rev mm mm/rev mm x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x General recommendation: 1.) From 2.5xD [thread depth] thread Ø should be programmed in 2 passes. [2/3-1/3 in the conventional milling] 2.) Generally in VA and in hard machining from > HRC40 it is recommended thread Ø is programmed in 2 passes. [2/3-1/3 in the conventional milling] optimally suited suited not suitable 61

62 Fräsen Milling Bohren Drilling Gewindebohren/ -fräsen/-formen Tapping/thread milling/ fluteless tapping Senken Countersinking Reiben Reaming CD KD Sonderlösungen Special solutions Werkzeugaufnahmen Dienstleistungen Modular systems Services Grooving systems.o. Box Albstadt Herderstraße Albstadt T ( ) 17-0 F ( ) info@guehring.de No liability can be accepted for printing errors or technical changes of any kind. Our Conditions of Sale and Terms of ayment apply. Available on request /1753-VI-22 rinted in Germany 2017