Table of contents BRAZED TURNING TOOLS. Toolholders H 2. Tips H 6. Rods H 8. Technical information H 9 H 1

Transcription

1 Table of contents BRAZED TURNING TOOLS Toolholders 2 Tips 6 Rods 8 9 1

2 ISO External holders General turning External Ordering Tip According to ISO (DIN ) h b l 1 f 1 f 2 a p r ε γ 1) λ 2) P1 P2 P3 P4 K1 K2 ISO 6 (DIN 498) κ r 9 ISO 1 (DIN 4971) κ r 75 ISO 2 (DIN 4972) κ r 45 ISO 5 (DIN 4977) κ r 9 ISO 6 R 11 C ,4 12 L 11 ISO 6 R 1212 C ,5 1,4 12 L 1212 ISO 6 R 1616 C ,4 12 L 1616 ISO 6 R 22 C ,8 12 L 22 ISO 6 R 2525 C ,5 2 1,2 12 L 2525 ISO 6 R 3232 C ,2 12 L 3232 h b l 1 f 1 a p r ε γ 1) λ 2) ISO 1 R 1616 C ,4 12 L 1616 ISO 1 R 22 C ,8 12 L 22 ISO 1 R 2525 C ,2 12 L 2525 h b l 1s l 1 f 1 f 1s a p r ε γ 1) λ 2) ISO 2 R 11 C ,4 12 L 11 ISO 2 R 1212 C ,4 12 L 1212 ISO 2 R 1616 C ,8 12 L 1616 ISO 2 R 22 C ,8 12 L 22 ISO 2 R 2525 C ,2 12 L 2525 ISO 2 R 3232 C ,2 12 L h b l 1 f 1 a p r ε γ 1) λ 2) ISO 5 R 1616 C ,4 12 ISO 5 R 22 C ,8 12 L 22 ISO 4 (DIN 4976) κ r 9 Neutral style shown 1) γ = Rake angle. 2) λ = Angle of inclination. κ r = Entering angle h b l 1 a r a p r ε γ 1) λ 2) ISO 4 11 C ,4 12 ISO C ,4 12 ISO C ,8 12 ISO C ,4 12 ISO 4 22 C ,2 12 ISO C ,2 12 Ordering example: 2 pieces ISO 6 R 11 P1 R = Right hand, L = Left hand 9 2

3 ISO External holders Parting/Grooving External Ordering Tip According to ISO (DIN ) h b l 1 a r a p γ 1) λ 2) P1 P2 P3 P4 K1 K2 ISO 7 (DIN 4981) κ r 9 ISO Internal holders General turning Internal According to ISO (DIN ) ISO 9 (DIN 4974) κ r 92 ISO 9 (DIN 4974) κ r 92 ISO 8 (DIN 4973) κ r 75 ISO 8 (DIN 4973) κ r 75 dm m ISO 7 R 16 D ISO 7 R 128 D L 128 ISO 7 R 1212 D ISO 7 R 161 D L 161 ISO 7 R 1616 D ISO 7 R 212 D L 212 ISO 7 R 22 D L 22 ISO 7 R 2516 D L 2516 ISO 7 R 2525 D L 2525 ISO 7 R 322 D L 322 ISO 7 R 425 D L 425 Ordering example: 2 pieces ISO 7 R 16 P2 R = Right hand, L = Left hand Ordering Tip h = b h 1 l 1 l 3 f 1 a p D c γ 1) λ 2) ISO 9 R 88 A5 8 6, , ISO 9 R 11 A ISO 9 R 1212 A8 12 9, , ISO 9 R 1616 A , , ISO 9 R 22 A , ISO 9 R 2525 A ISO 9 R 3232 A , dm m h 1 l 1 f 1 a p D c γ 1) λ 2) ISO 9 R 8 A5 8 6, , ISO 9 R 1 A ISO 9 R 12 A8 12 9, , ISO 9 R 16 A , , ISO 9 R 2 A , ISO 9 R 25 A , P1 P2 P3 P4 K1 K2 h = b h 1 l 1 l 3 f 1 a p D c γ 1) λ 2) ISO 8 R 11 A , ISO 8 R 1212 A8 12 9, , ISO 8 R 1616 A , , ISO 8 R 22 A , ISO 8 R 2525 A , dm m h 1 l 1 f 1 a p D c γ 1) λ 2) ISO 8 R8 A5 8 6, ) γ = Rake angle. 2) λ = Angle of inclination. κ r = Entering angle dm m Ordering example: 2 pieces ISO 9 R 88 P2 R = Right hand 3

4 Coromant standard toolholders General turning External Ordering Tip h b l 1 f 1 r ε γ 1) P1 P2 P3 P4 K1 K2 115 R G ,5 1,5 5 R G ,5 2, R G ,813,5 L h b l a l 1 r ε v γ 1) λ 2) CR ,6 14, CR ,3 14, CR ,9 14,5 38 Neutral style shown 1) γ = Rake angle. 2) λ = Angle of inclination Ordering example: 2 pieces R P2 2 pieces L P3 R = Right hand, L = Left hand Threading These tools are designed for use in CRI-DAN type B machines. Tools for CRI-DAN machines types A, C, D and TT are manufactured to order. Ordering Tip h b l 1 f 1 a p γ 1) λ 2) P1 P2 P3 P4 K1 K2 166 External R FT ,5 2,6 166 Internal 1) γ = Rake angle. 2) λ = Angle of inclination D 1 h=b h 1 l 1 l 3 a p f 1 D c γ 1) λ 2) R FU , R FU , R FU , , Ordering example: 2 pieces R P1 R = Right hand 9 4

5 Coromant standard toolholders Round shank boring tools Internal 141 κ r 9 Ordering Tip dm m h l 1 f 1 a p D c γ 1) λ 2) BRAZED TURNING TOOLS P1 P2 P3 P4 K1 K2 L ) , L A8 1 8,5 5 4, L B1 12 1,5 6 5, L B , P K Left hand style shown 14 κ r 6 Left hand style shown 1) γ = Rake angle. 2) λ = Angle of inclination 3) Solid carbide dm m h l 1 a p D c γ 1) λ 2) L ) 6 5,5 18 6, L ) 8 7, 24 7, L 14-1 A8 1 8,5 5 6, L B1 12 1,5 6 8, L B ,8 9 1, Ordering example: 2 pieces L P2 L = Left hand 9 5

6 Tips Ordering P K l a iw s r ε α n S1P S4 S6 1P 1 13A Styles A, B Style A shown. Style B opposite hand Style AC According to ISO (DIN ) A A , 5 2, 5 A A A A A A A B B B B B B l a iw s r ε AC ,5 2 AC ,5 2 AC ,5 3 Style BO l a iw s BO1 9,9 9,9 3 BO13 12,5 12,5 4 Style C l a iw s α n According to ISO (DIN ) C ,5 C C C C C C C Style CR l l a iw s v CR , CR2 22 7, CR25 3 9, Tolerances, mm Dimension Tolerance >1 +,3 +,4 +,6 +1, +2, 3% Ordering example: 1 pieces A5 S4 9 6

7 Tips Ordering l a l s α n S1P S4 S6 1P 13A Style D D D D D D D D According to ISO (DIN ) Style DA l a iw s DA2 12 2,5 1,5 DA3 16 3,5 1,8 DA4 2 4,5 2,5 DA5 25 5, 3, Style E Style FT According to ISO (DIN ) iw l s α n 2, E E E , 5 E E E E E iw if 1 l s 1, 1, 1, FT FT FT Style G iw l s r ε G , G ,5 G ,5 G ,5 G ,5 Tolerances, mm Dimension Tolerance >1 +,3 +,4 +,6 +1, +2, 3% Ordering example: 1 pieces D3 S4 9 7

8 Tips Ordering l a iw s S1P S4 S6 1P 13A Style K Rods 1) For tolerances, see previous page. K2 2, K3 3, K4 4, K5 5, K6 6, K7 7, K8 8,5 2 6 K1 1,5 2 6 K12 12,8 2 6 Ordering K d l 2 2 Style 68 Ground Tolerances, mm d = ISOh9 l 2 = Style B-68 Unground Tolerances, mm d 5 mm +,45 +,15 d 6 mm+,55 +,15 l 2 = +2 d l 2 B B B B B B B Style B-682 Unground Tolerances, mm Dimension Tolerance ,3 +,4 +,6 +3 l 2 iw s B B B B B B B B B B B B B B B B ) Ground and unground rods in other dimensions and tolerances can be supplied, subject to quotation. Ordering example: 1 pieces K2 13A 9 8

9 Brazed tools continue to retain their role in tooling programmes because of the ease with which they can be adapted to particular requirements, such as; modified radii, rake angle and special chip breakers. Brazing The brazed joint has two functions: To hold the carbide tip in position despite heavy shearing forces and high temperatures. Must be capable of imizing the stress which occurs during the heating and cooling of the tool material. Shank material A suitable shank material is carbon steel with,7% C and a tensile strength of about 685 N/mm 2 (7 kp/mm 2 ). In order to imize stress, the ratio between the thickness of the carbide tip and the height of the shank material beneath the tip should be approx. 1:3. s/3 s 3s Seat of the tip Arrange the seating of the tip so that the brazing stress is as low as possible. Open tip seats generally give the best result. Only the underside of the tip and one side face (max 1/3 of the tip s thickness) should come into contact with the tool shank. Regrinding is facilitated and the carbide tip s thickness is better preserved if the tip is set at an inclination (γ n2 ) greater than the top-rake angle (γ n1 ). (See next page.) γ nz Cleaning Grind the brazing areas of the tip on a silicon carbide or diamond wheel. Alternatively, they may be shot blasted with steel shot. Degrease the tip, and when necessary the tip-seating of the shank as well, with a suitable solvent such as trichlorethylene or acetone. Brazing agents The brazing method and brazing agents are selected according to the tool s working temperature and calculated stress. The following brazing procedures are recommended: Tools for normal working temperatures: Low-melting silver point solder with appropriate flux. Brazing temperature 65 7 C. Tools with thin and long tips or with a complex design: The tips should be brazed with a shim of copper, thickness,2,3 mm. Silver solder, temperature 65 7 C. Tools for high working temperatures: For example parting tools, heavy roughing tools etc. Use electrolytic, non-acid copper with a melting point of 173 C. Flux: anhydrous borax, or according to recommendations from the supplier of the brazing agent. Brazing or welding torches Mainly suitable for making tools in smaller quantities. Use a slightly reduced flame, for example, a surplus of acetylene gas. Start heating with the flame directed against the under side of the tool and behind the seating of the tip. igh-frequency units Most economical for brazing larger quantities, but are generally limited to small and medium-sized tools. It is important that the shape of the high-frequency coil be matched to the tool. Use plenty of flux. When the solder melts, stop heating and press the tip into position with a pointed iron rod. For standard tools in ordinary grades, gradual cooling is not necessary, but for complicated tools a container with mica or charcoal powder is recommended. Cutting data As a rule a lower cutting speed should be used for brazed tooling than indexable inserts. SAFETY INFORMATION Precautions when grinding and brazing of cemented carbide, see section K. 9

10 Grinding Grind with care it pays! A stable grinding table or holder, which can be set at the desired angle by means of a graduated scale, and vibration-free running spindles are necessary for a good result. Rough grinding can, as a rule, be carried out with a silicon carbide wheel. Always use a diamond wheel when finish grinding or lapping. Longer cutting edge life and fewer tip breakage, fully justify the increased costs entailed by correct grinding. Keep the grinding wheel clean. Its cutting capacity depends to a large degree on this. Always grind into the cutting edge and, as far as possible, at right angles to it. b a c b a Top face b Secondary clearances c Lapped primary clearances d Chipbreaker groove d α γ n1 γn2 γ n1 Top-rake angle γ n2 Tip seating angle α Clearance angle Top rake angles: γ n1 = 14 Grade S6. γ n2 = 1 Other grades. Most carbides have a low heat conductivity and must, therefore, be ground with care. For wet grinding, the coolant should be applied abundantly and in an even stream. Never cool a carbide tool by quenching. Coromant turning tools usually have the carbide tip set at a greater inclination (λ) than the top-rake angle (γ). Regrinding is facilitated as only the primary rake portion of the top face needs to be ground, and the effective thickness of the tip is better preserved. Sequence of operations for grinding 1. Badly worn or damaged tools a. Grind away shank material under the tip. Aluium oxide wheel grit ardness J L. Peripheral speed 2 25 m/sec. α n2 =1 12 Dry grinding. b.grind clearance angles. Silicon carbide wheel (green grit). Grit 38 6, hardness J. Peripheral speed 2 25 m/sec. α n1 = 7 1 Dry grinding. 2. Normally or slightly worn tools and finish lapping of rough-ground tools a.lap top face. Diamond lapping wheel. Grit 18 22, metal bonded. Peripheral speed m/sec. Wet grinding. b.lap primary clearances and nose radius. Diamond lapping wheel. Grit 22 32, metal bonded. Peripheral speed m/sec. α n1 = 5 7 Wet grinding. y y y α n2 α n1 α n1 Nose radius: For finishing of steel 1,2 2 x the feed. For roughing of steel 3, 4 x the feed. For cast iron use a larger radius than for steel. 3. Grinding of chipbreaker Diamond lapping wheel. Grit 18 22, metal bonded. Peripheral speed m/sec. σ Β = 45 Wet grinding. Guide for chipbreaker dimensions Depth of cut mm Feed f n, mm/r,2,35,55 Chipbreaker l B x h B mm 1 1,5 x,3 2, x,4 3, x,5 4 2,5 x,5 3, x,5 4, x,6 9 3, x,5 4, x,6 4,5 x,6 4. Reinforcement of the edge Silicon carbide handlap. Grit Alternatively, a boron carbide handlap, or diamond handlap. Grit Light handlapping for finishing of steel. In other cases, according to the degree of protection required for the cutting edge.