Accession Number : AD0288122

Title :   MOLYBDENUM STRUCTURAL COMPONENT PROGRAM

Corporate Author : MCDONNELL AIRCRAFT CORP ST LOUIS MO

Report Date : 01 NOV 1962

Pagination or Media Count : 6

Abstract : Fifty-six 0.06 X 2.5 X 3.0 in. specimens (Mo.-0.5% Ti alloy) were sawed with a mild steel back-up. The number of teeth per in. (TPI) and speed of the saw cuts were varied. The 32 TPI blade was tried with low, high, and medium saw speeds, all giving unsatisfactory results. The slow speed was the more usable of the three. The course tooth (10 TPI) blade was tried next with rough laminated edges resulting at slow speeds and high heat and rapid dulling of the blade at high speeds. In changing to the 24 TPI blade it was found that at very slow speeds the teeth broke. The best results were at 120 surface ft/min (SFPM) with the edges becoming rougher and the blade dulling more rapidly as the saw speed was increased. The blade was ruined rapidly (1/8 to 1/4 in. cut) at 1550 SFPM. It was decided that a finer tooth (32 TPI) would give better results and the speed should be the 120 SFPM that gave the best results for the 24 TPI. In comparing the 120 SFPM 32 TPI cut with the 24 TPI cut at the same speed, more material could be sawed before changing blades and smoother edges were obtained using the 32 TPI. It was concluded that a saw speed of 120 SFPM combined with HSS 32 TPI blade gave the smoothest lamination free sawed edge. (Author)

Descriptors :   *MOLYBDENUM ALLOYS, *SHEETS, AIRFRAMES, CHEMICAL MILLING, CONTAMINATION, SAW BLADES, SAWS, STRUCTURES, TITANIUM ALLOYS, TUNGSTEN

Distribution Statement : APPROVED FOR PUBLIC RELEASE