Valenite Grade VP8525 for Stainless Steel
Valenite LLC has introduced two new tooling grades—expanding its targeted and application-specific lineup that allows users to better match machining operations and workpiece materials with tooling inserts for optimum production efficiencies, quality and economies. The new cutting technologies are the ValProTM VP8515 and VP8525 MT-CVD series of inserts. Both are being developed to augment the existing VP8535 grade and provide a complete range of turning capabilities for 304 and 316 stainless steels, Inconel and heat resistant alloys. The VP8515 is for finishing operations and the VP8525 is used for general duty semi-roughing/finishing. The existing VP8535 is for heavy metal removal tasks and roughing operations.
The VP8515 grade is set for high cutting speed (>200 m/min) at typical finishing
cut depths and has broad applicability with F5, M4, M6, M8, PM2, PM5 geometries. This grade is ideal for continuous turning of austenitic and duplex stainless steels at higher speeds providing reliable and predictable performance, with extended insert service life. Inserts using VP8515 grade have a thin yellow TiN outer coating for easy visual wear identification, an Al2O3 layer for thermal protection, a fine MT-CVD TiCN coating that helps to prevent flaking and reduces flank wear. Also incorporated in the tooling is a gradient area for added surface toughness, and a hard substrate offering greater resistance to wear and plastic deformation.
The TiCN/Al2O3/TiN coating is formulated specifically for turning of stainless steels and to resist sticking, notch wear and edge build-up, for enhanced hardness when hot.
The VP8525’s performance characteristics deliver high cutting speeds (>150 m/min) with mid- to large cutting depths…inserts have M4, M6, M8, R9, PM4, PM5 geometries to cover a myriad of cutting parameters. This grade is a basic choice for general duty M-class turning—continuous or intermittent cutting of austenitic and duplex stainless steels. These tools reduce the risk of plastic deformation and, like the VP8515, provide reliable performance and extended tool life. The VP8525 grade has similar coating technologies, layering and substrate construction as the finishing grade, including the TiCN/Al2O3/TiN coating for the efficient turning of stainless steels.
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Valenite, continuing its extensive product development programs, has introduced the new VP8515 and VP8525 tooling grades…engineered for high speed, high productivity turning operations for finishing and semi-finishing 304 & 316 stainless steels, Inconel, and heat resistant alloys.
Popularity: 27%
Machining Cast Iron with CBN
December 9, 2008 by admin
Filed under David Richards Engineering
CBN can provide a cost effective and highly productive alternative to hard metal or ceramic cutting tools for the machining of cast irons. In general terms, the following factors should be considered when applying CBN to an iron component:
Cast iron is not generally very hard (less than HRc.30) but tends to be abrasive. CBN is therefore employed because of its abrasive resistance. Unless the iron has been chilled or deliberately heat treated, the cutting action will be such that the CBN will not be required to anneal the material being cut in the shear zone. Grey cast irons are often fully pearlitic in structure – Grade 14 & 17 are common. In this case, the best results are gained using DR – 100/80 at surface speeds above 400 m/min. if the machine tool or component limit the speed available to less than 400 m/min, DR – 50 becomes more cost effective.
Tool life and component quality improvements are often dramatic and more than justify the increased cost of the CBN tools. if the grey cast iron is not fully pearlitic and more free ferrite is present within the structure, the machinability of the iron becomes more difficult to predict. As the level of “soft and sticky” ferrite increases, the tool is more likely to suffer adhesion pick up which will alter the cutting action, resulting in premature wear of the tool. DR-50 becomes more likely to provide good results as the level of free ferrite increases and a short trial will soon determine the most suitable PCBN material.
Fully ferritic grey cast irons are not generally cost effective PCBN applications. S.G. irons are generally soft (less than HRc.30 ) and fully ferritic. PCBN is therefore not generally as efficient as other cuttingtool materials. There has, however, been a tendency to produce S.G. irons (nodular irons) with a pearlitic structure. This has resulted in some nominally S.G. irons machining surprisingly well with PCBN, DR-50 tending to be more successful. Low alloy irons commonly used in the automotive industry can be machined with CBN, but the performance is again dependant on the level of free ferrite in the structure of the iron.
Hardened irons, either heat treated or alloyed and heat treated, are machined in the same manner as hardened steels and are therefore more predictable. Cutting speeds recommended are lower – less than 200 m/min. It must be remembered that cast iron of a given specification produced by a foundry on one day may have a different machinabilty to that produced the next day. Once the benefits of machining with CBN have been determined, it may be considered worthwhile ensuring that castings supplied to the machine shop have a suitable microstructure to guarantee consistent PCBN tool performance. if the structure or grade of cast iron is unknown, a simple trial will soon determine the suitability of PCBN as a cutting tool.
You can find inserts for cast iron at David Richards Engineering Limited http://www.dreng.co.uk
Popularity: 25%
Iscar HeliTurn
Popularity: 22%
Iscar HeliTurn
Iscar HeliTurn
ISCAR’s HELITURN system features a unique, double-sided insert with 4 cutting edges for Fast Metal Removal (FMR) turning. The new HELITURN is a tangentially clamped insert with a unique helical shaped cutting edge, useful for large depths of cut and higher than normal feed rate.
The LNMX…-HT HELITURN insert is screw-clamped into the SLANR toolholder and supported by the TLN ..-HT carbide seat. This seat has ground surfaces on the top and bottom, to ensure perfect contact of the insert with the toolholder.
The upper rake face of this insert is mounted level with the top of the toolholder to enable chips to flow across the insert, without being disturbed by clamps or the toolholder body. The 4 curved helical cutting edges ensure positive radial rake angles and soft penetration into the material being cut. The lower forces and smaller loads ensure better tool life, higher stability and the ability to use very large depths of cut and higher feeds. The chipformer (with small bumps), deforms and breaks the chip into rib type curved segments which can easily be removed from the cutting area.
The insert has a frontal clearance angle of 3.7° with a 6° side clearance angle to allow machining to a 90° shoulder.
Depths of cut up to 8 mm [.315”] and facing depths to 3.2 mm [.126” ]
at up to 1.2 mm/rev [.047” IPR] are achievable with HELITURN.
Find out more information of Iscar HeliTurn at Iscar USA
Popularity: 25%
