Net prices, valid until MORE PERFORMANCE THAN YOU EXPECT. HOLEX ProSteel the latest generation of solid carbide roughing end mills HPC.

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1 Net prices, valid until MORE PERFORMANCE THAN YOU EXPECT. HOLEX ProSteel the latest generation of solid carbide roughing end mills.

2 HOLEX ProSteel eshop.hoffmann-group.com MACHINING OF STEELS CARBON CONTENT IN STEEL The proportion of carbon (C) influences the structure of steel and therefore plays a decisive role in machinability. Low carbon content creates a ferritic structure. A further increase in carbon, with an increasing proportion of cementite (hard and brittle), will create a ferrite-perlite structure. Steels with a carbon content of > 2.6 % are called cast iron (see right-hand side). C-content <.25 %: C-content >.25 <. %: C-content >. <.8 %: C-content >.8 %: Machinability is characterised by the properties of the ferrite. Here the properties of the perlite come into play. Further increase of perlite, until at.8 % only perlite is present. Hard and brittle structure. (Formation of built-up edges, snarl chips, bad surface quality) (Limited formation of built-up edges, improved chip formation and surface quality, higher stress on tools) (Good machinability regarding chip formation and surface, but further increase in stress on tools) (Significant flank wear) Example: ST37-2 Example: ST5-2 Example: CK5 Example: 1Cr6 IMPORTANT ALLOY ELEMENTS FOR STEELS Chromium (Cr), nickel (Ni), molybdenum (Mo), tungsten (W): Increase strength by formation of mixed carbides, reduce machinability. Manganese (Mn): Improves hardenability and strength, proportions of < 1.5 % and low C-content benefit machinability. Lead (Pb): Shorter chipping length, reduction of tool wear. Sulphur (S), phosphorus (P): Overall improvement of machinability. CLASSIFICATION OF STEELS DEPENG ON ALLOY CONTENT General structural steels: Classification according to tensile strength. Unalloyed steels: Classification according to chemical composition. Low-alloy steels: (in total < 5 % alloy content) Improved hardenability and heat resistance compared to unalloyed steels. High-alloy steels: (at least 1 alloy element with > 5 %) Special characteristics re. physical (e.g. stainless or magnetic) properties. Example: ST-2 has approx. 3 N/mm 2. Example: C5 is a heattreatable steel with.5 % C-content. See tool test page. Example: 2 CrMo contains.2 % carbon, as well as 1 % Cr and a low proportion of Mo (approx..22 %). See tool test page 5. Example: X 5 CrNiMo (C =.5 %, Cr = 18 %, Ni = 12 %, low proportion of Mo). 2

3 CAST IRON MATERIALS Cast irons are iron alloys with a high carbon content (C > 2.6 %). This distinguishes cast iron from steel (C-content 2.6 %). Further alloy elements in cast iron can be silicon, manganese, nickel, chromium and molybdenum. With approx. 7.2 g/cm 3 the density of cast iron is lower than that of steel and pure iron (7.85 g/cm 3 ). In white cast iron, carbon is present as carbide in the shape of cementite, in grey cast iron as graphite. Graphite in turn can take on different forms, recognisable by the designation (GJL, GJS). GJL (GG / GGL) Grey cast iron with lamellar graphite (C-content 2.5 % 5 %) During machining chip fragments are formed (discontinuous chip), which prevent excessive flank wear. The slightest structural changes, however, can have a significant influence on tool life. GJL EN-GJL Discontinuous chip Formation of cracks Breaks on the workpiece Good machinability GJS (GGG) Grey cast iron with spheroidal graphite (C-content 2.5 % 5 %) Types with low strength and good toughness are, for example, GGG. Machining leads to ductile deformation of the basic metal structure and the graphite spheroids embedded in it. Helical chips are formed, which display strong break characteristics. This leads to higher flank wear. GJS EN-GJS Short helical chips Ductile deformation Abrasive High flank wear ADI (Austempered Ductile Iron) Subjecting EN-GJS / GGG (cast iron with spheroidal graphite) to multi-stage heat treatment leads to a marked change in the structure of the material. The heat treatment generates a special micro-structure. ADI therefore has a special position amongst the casting materials. ADI combines such useful characteristics as a high coefficient of expansion with high tensile strength and especially good wear resistance. In comparison to conventional cast irons (GJL and GJS), ADI has a significantly higher specific strength, which is in the range of higher strength steels. ADI EN-GJS ( 8 N/mm²) Very abrasive Hardening possible Cooling necessary High wear 3

4 HOLEX ProSteel eshop.hoffmann-group.com THE NEW ROUGHING END MILLS COMPA Width of wear mark TEST SERIES ON UNALLOYED HEAT-TREATABLE STEEL C5 (1.53) (mm),5,,35,3,25,2,15,1,5 Chart on wear: full slot milling a e = 1 D Test parameters Machine: 5-axis machining centre, interface HSK63 Working engagement a e = 1 D (full slot) Cutting depth a p = 1 D Cutting speed v c and feed per tooth f z : according to competition's specifications End of tool life: reaching of regrind limit (m) Tool life CLOSE-UP AT END OF TOOL LIFE 1 st place: HOLEX ProSteel 135 m (Regrind limit not reached) 2 nd place: competitor A 85 m 3 rd place: competitor B 65 m th place: competitor C 62 m

5 RED TO THE COMPETITION Width of wear mark TEST SERIES ON ALLOYED STEEL 2CRMO (1.7225) (mm),9,8,7,6,5,,3,2 Chart on wear: trimming a e =. D Test parameters Machine: 5-axis machining centre, interface HSK63 Working engagement a e =. D (contour) Cutting depth a p = 1 D Cutting speed v c and feed per tooth f z : according to competition's specifications End of tool life: reaching of regrind limit, (m) Tool life CLOSE-UP AT END OF TOOL LIFE 1 st place: HOLEX ProSteel 18 m 2 nd place: competitor C 155 m 3 rd place: competitor A 15 m th place: competitor B 7 m 5

6 HOLEX ProSteel eshop.hoffmann-group.com ProSteel solid carbide roughing end mill set VHM 6527 Typ N,3 38 a e, D 6535 HB Version: Tolerance: Advantage: Supplied with: For roughing and finishing, extremely smooth running. Size nominal : /.3 mm. Optimised flute profile, eccentric relief ground, large flutes. -part solid carbide roughing end mill set: No in sizes 6 / 8 / 1 / 12 and plastic box. As long as stocks last. v c = m/min Plastics Cast > 1 % Si < 5 N < 75 N < 9 N < 11 N < 1 N < 55 HRC < 6 HRC < 67 HRC Ti GG(G) CuZn Graphite GRP CRP < 9 N > 9 N > 85 N max min ISO code: N N N P P P P P H H H M M S K N N XXX 2 35 Set ProSteel solid carbide roughing end mill TiAlN set XXX Content: 1 each solid carbide end mill Size 6 / 8 / 1 / 12 ProSteel solid carbide roughing end mill Uni Air VHM Version: Tolerance: Advantage: 6527 Typ N,3 38 a e, D For roughing and finishing, extremely smooth running. Size nominal : /.3 mm. Optimised flute profile, eccentric relief ground, large flutes HB v c = m/min Plastics Cast > 1 % Si < 5 N < 75 N < 9 N < 11 N < 1 N < 55 HRC < 6 HRC < 67 HRC Ti GG(G) CuZn Graphite GRP CRP < 9 N > 9 N > 85 N max min ISO code: N N N P P P P P H H H M M S K N N Uni Air D C 12X ProSteel solid carbide roughing end mill <75 N <11N L s L tot h6 f z f z f z GG(G) mm TiAIN mm mm mm mm mm mm mm mm mm mm 3 XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX Net prices and special net prices, valid until

7 ProSteel solid carbide roughing end mill VHM 6527 Typ N,3 38 a e, D 6535 HB Version: Tolerance: Advantage: For roughing and finishing, extremely smooth running. Size nominal : /.3 mm. Optimised flute profile, eccentric relief ground, large flutes. Ground recess v c = m/min Plastics Cast > 1 % Si < 5 N < 75 N < 9 N < 11 N < 1 N < 55 HRC < 6 HRC < 67 HRC Ti GG(G) CuZn Graphite GRP CRP < 9 N > 9 N > 85 N max min ISO code: N N N P P P P P H H H M M S K N N Uni Air D C 12X 2 35 ProSteel solid carbide roughing end mill <75 N <11N L s L D L tot h6 f z f z f z GG(G) mm TiAIN mm mm mm mm mm mm mm mm mm mm mm mm 3 XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX ProSteel solid carbide roughing end mill VHM 6527 Typ N,3 38 a e,3 D 6535 HB Version: Tolerance: Advantage: For roughing and finishing, extremely smooth running. Size nominal : /.3 mm. Optimised flute profile, eccentric relief ground, large flutes. Ground recess v c = m/min Plastics Cast > 1 % Si < 5 N < 75 N < 9 N < 11 N < 1 N < 55 HRC < 6 HRC < 67 HRC Ti GG(G) CuZn Graphite GRP CRP < 9 N > 9 N > 85 N max min ISO code: N N N P P P P P H H H M M S K N N Uni Air D C 12X ProSteel solid carbide roughing end mill <75 N <11N L s L D L tot h6 f z f z f z GG(G) mm TiAIN mm mm mm mm mm mm mm mm mm mm mm mm 5 XXX XXX XXX XXX XXX XXX XXX Net prices, valid until

8 THE RIGHT CHOICE FOR EVERY AREA: GOOD QUALITY AT A GOOD PRICE. MACHINING Accurate and cost-efficient: HOLEX drilling and milling tools deliver clear machining results. GRING AND CUTTING Rigorous and exact: HOLEX grinding and cutting tools for consistent high-precision processing of materials. CLAMPING TECHNOLOGY Strong and secure: HOLEX clamping tools for fast and secure fixing of any material. HAND TOOLS Functional and solid: HOLEX hand tools for impressive ergonomics and robustness. METROLOGY Precise and fast: HOLEX measuring tools deliver precise results in seconds. WORKSTATIONS AND STORAGE Practical and robust: HOLEX workstations and storage units are extremely robust and facilitate comfortable and flexible working. This advertising brochure, its graphic layout and the item numbering system used are protected by copyright. Reprinting and reproduction of any kind even as extracts is permitted only with the written authorisation of Hoffmann GmbH Qualitätswerkzeuge, 8121 Munich, Germany. All net prices valid until ; prices in without guarantee. We reserve the right to correct errors and make changes. Hoffmann GmbH Herbert-Ludwig-Straße D Achim Order by phone: + () Order by fax: + () Order by en KW1522 EN

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