User manual 3M 02-2004 REMOVING TURBINE BLADE DEFECTS USING BACKSTAND

[. . . ] Application Profile Market: Turbine Blades (Aerospace and Industrial Gas) Application Description: Removing casting scale, milling lines and minor defects using a backstand Key Application Requirements Remove casting scale, milling lines and minor surface defects from nickel alloy or titanium cast multi-segment vanes, while leaving a consistent, high quality finish. 241575 PRODUCT 3MTM TrizactTM CF Belt, grades A300 ­ A160 Scotch-BriteTM Surface Conditioning Belt, A MED or A VFN Products Replaced Competitive J weight conventional coated abrasive belts in grades P80 ­ P240. Advantages/Benefits To Customer Consistent, improved finishes 3M Trizact CF Belt features a macroreplicated matrix of resin and aluminum oxide mineral on a flexible X weight cloth backing. The structure is designed to break down under moderate to high grinding pressure, exposing fresh mineral to the grinding/polishing interface. [. . . ] If blades are cast, the shell is removed from the structure by vibratory or chemical means and then the individual castings are cut from the structure using cut-off wheels. The remaining gate is removed using coated abrasives before the part goes to the finishing/polishing department. If blades are forged, subsequent processing includes CNC milling, which leaves milling and machining lines on the parts. Historically conventional coated abrasive belts are used to remove casting scale, milling lines and minor surface defects and to provide the required surface finish. The abrasive sequence depends on the required finish specifications, but a common starting point is a J weight belt in grade P80, often followed by P180 and then P240. Using 3MTM TrizactTM CF on a backstand lathe for removing milling lines and minor defects will provide longer life and a high quality, more consistent finish than conventional coated abrasives. For nickel alloys, A300 or alternatives such as 966F/977F are recommended. Recommended Trizact CF Process Application Casting scale, milling line and minor defect removal Coarse scratch refinement Scratch refinement Scratch refinement Overall blending of airfoil Recommended Trizact CF Sequence A300 A160 or A100 A65 Scotch-BriteTM Surface Conditioning Belt A MED or A VFN Competitive Coated Abrasive J weight P80 J weight P180 J weight P240 A MED grade non-woven belt Recommended Belt Speeds High nickel alloys or Stainless Steel: 6, 000 ­ 7, 000 SFPM Titanium: 2, 500 ­ 3, 500 SFPM Contact Wheel Selection ­ Starting Points Application Concave part of turbine blade Convex part of turbine blade Contact Wheel Size Large diameter 1" ­ 3" diameter Contact Wheel Durometer Hard (60­70) Hard (60­70) Contact Wheel Serration Pattern Mild (1:1) Mild (1:1) Market: Turbine Blades (Aerospace and Industrial Gas) Application Description: Removing casting scale, milling lines and minor defects using a backstand page 3 Related Products Following Trizact CF Belt to blend the blade: Scotch-BriteTM SF Wheel in grade 8S FIN For root of the blade (where belts have potential to over-cut): 3MTM XR Wheel 1208 Related Applications "Turbine Blades (Multi-segment Vanes) ­ Removing casting scale, milling lines and minor defects using small diameter contact wheels" Safety Information Always read and follow all safety information included with the product. To request additional product information or to arrange for sales assistance, call 1-800-362-3550. Address correspondence to: 3M Industrial Business Customer Response Center, Building 21-1W-10, 900 Bush Avenue, St. All statements, technical information and recommendations contained in this document are based upon tests or experience that 3M believes are reliable. However, many factors beyond 3M's control can affect the use and performance of a 3M product in a particular application, including the conditions under which the product is used and the time and environmental conditions in which the product is expected to perform. Since these factors are uniquely within the user's knowledge and control, it is essential that the user evaluate the 3M product to determine whether it is fit for a particular purpose and suitable for the user's method of application. [. . . ] If the 3M product is defective within the warranty period, your exclusive remedy and 3M's and seller's sole obligation will be, at 3M's option, to replace the product or refund the purchase price. Except where prohibited by law, 3M and seller will not be liable for any loss or damage arising from the 3M product, whether direct, indirect, special, incidental, or consequential, regardless of the legal theory asserted, including warranty, contract, negligence, or strict liability. For Additional Information Product Use Warranty and Limited Remedy Limitation of Liability Trizact and Scotch-Brite are trademarks of 3M. Industrial Business Building 21-1W-10, 900 Bush Avenue St. [. . . ]