Accession Number : ADA190480

Title :   Drilling Metal Matrix Composites.

Descriptive Note : Final rept.,

Corporate Author : ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s) : Ricci, William S ; Swider, Stacy E ; Moores, Thomas J

PDF Url : ADA190480

Report Date : Jan 1988

Pagination or Media Count : 21

Abstract : Polycrystalline diamond (PCD) tipped twist and spade drills, diamond plated twist and core drills, and the abrasive waterjet hole cutting process were evaluated for drilling aluminum metal matrix composites reinforced with SiC fibers or particulates. The diamond tipped twist drills outperformed all other drills. Core drills were found to be viable alternatives for the production of larger holes in high volume fraction composites. Plated twist drills were viable alternatives for low volume fraction particulate reinforced composites. Spade drills failed due to low edge strength. Abrasive waterjet hole cutting was successful for rough, large diameter hole cutting. Recommended drilling parameters are listed for all of the above techniques. The failure of diamond coated drills used on metal matrix composites was found to have been due to diamond glazing by the hard and abrasive reinforcement material and loading by the soft metallic matrix. It was determined that the machinability cutting rate of metal matrix composites can be predicted by using the rule of mixtures and machinability data for the individual components of a composite.

Descriptors :   *DRILLING, *MACHINABILITY, *METAL MATRIX COMPOSITES, *HARDNESS, ABRASIVES, COATINGS, CUTTING, DIAMONDS, DRILLS, EDGES, PLATING, POLYCRYSTALLINE, MACHINE SHOP PRACTICE, DIAMOND WHEELS

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE