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ASM Failure Analysis Case Histories

ASM Failure Analysis Case Histories: Machine Tools and Manufacturing Equipment

ASM International
ISBN electronic:
978-1-62708-223-5
Publication date:
2019
Book Chapter

Broken Milling Machine Arbors Made of 16 Mn Cr 5 E

By
Gudrun Urban
Gudrun Urban
Messerschmitt Bölkow Blohm GmbH, Unternehmensbereich Flugzeuge
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Published:
2019

Abstract

Milling machine arbors were inserted with satellite spindles having a maximum speed of 1500 rpm, and broke out between the groove and the flange. The appearance of the fracture surface was the same on both arbors. The pronounced scan lines characterized the fractures as fatigue fractures. The appearance of the fracture in the arbors indicated ductile fatigue fracture which had its origin in the radii between groove and flange. These radii of 0.15 and 0.2 mm were too small for the load on the milling machine. In addition there were grooves at the base of the radii which had an unfavorable effect on the life of the component by acting as notches with their resulting stress concentration. Considering the great hardness of the case, the small radii would have been critical even without grooves. Measures were taken so that the critical radius of the milling machine was increased and the surface roughness measured more precisely.

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Gudrun Urban, 2019. "Broken Milling Machine Arbors Made of 16 Mn Cr 5 E", ASM Failure Analysis Case Histories: Machine Tools and Manufacturing Equipment

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