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surface-rolling machines

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001568
EISBN: 978-1-62708-230-3
...Abstract Abstract Two suction rolls at the first press section of a 25 ft. wide paper machine developed cracks within two years of service. The rolls were austenitic stainless steel castings made of ASTM A 351 Grade CF8M alloy containing molybdenum. The rolls were exposed to slightly acidic...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001842
EISBN: 978-1-62708-241-9
.... Guide rolls serve to hold the felt up against the surfaces of the dryer rolls. It was one of the felt guide rolls that fractured. The fracture of this roll not only shut down the machine but also damaged the belt, damaged multiple of the dryer rolls, and damaged other felt guide rolls in the vicinity...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
... on ceramic balls surfaces. It discusses the propagation of fatigue cracks involved in rolling contacts. The characteristics of various types of RCF test machines are summarized. The article concludes with a discussion on the various failure modes of silicon nitride in rolling contact. These include...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001131
EISBN: 978-1-62708-214-3
..., indicating that quench cracking was not a mode of failure. Conclusion and Recommendations Most Probable Cause Fracture occurred as a result of an oxide seam present in the raw material. Machining operations removed the original surface oxide from two of the four surfaces of the hot-rolled bars...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047161
EISBN: 978-1-62708-235-8
... are not uncommon in rolled bars and generally do not present a serious problem if allowance has been made for adequate stock removal before finishing. Unfortunately, the shaft in this case was to be used without further machining and was therefore rejected. Use of components with surface-defect indications...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001907
EISBN: 978-1-62708-217-4
... investigation were compromised as a result of the parts being machined rather than forged. The same advantages apply to threads that are rolled rather than cut. Carburization raises the surface hardness of the part and is usually beneficial with respect to surface wear and fatigue resistance. However...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047315
EISBN: 978-1-62708-225-9
...Abstract Abstract A sand-cast gray iron flanged nut was used to adjust the upper roll on a 3.05 m (10 ft) pyramid-type plate-bending machine. The flange broke away from the body of the nut during service. Analysis (visual inspection and 150x micrographs of sections etched with nital) supported...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001231
EISBN: 978-1-62708-232-7
... there. The tooth bottom was machined only roughly. Also, the yield point was a little bit too low. Forgings Gears Pitting (wear) Rolling mills Fe-0.4C-0.8Si-1.1Mn Rolling-contact wear Fatigue fracture The rim of a gear wheel of 420 mm width and 3100 mm in diameter broke after four years...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001551
EISBN: 978-1-62708-233-4
... origins indicating rotational vibration fatigue. Keeping bolts tight solved this problem. In another case, grinding machines were unable to produce surfaces of uniform quality and smoothness on steel bearing products. Measurements showed that self-excited vibrations were created when particular steels...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0048804
EISBN: 978-1-62708-230-3
...Abstract Abstract Several cases of failures in gray cast iron paper machine dryer rolls were evaluated. The rolls were found have ground outer cylindrical surfaces on which the paper web is dried. They were found to rotate about their longitudinal axes at speeds from 50 to 250 rpm while...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048073
EISBN: 978-1-62708-224-2
... (10-ton) load. Specifications indicated that the shaft was made of 1030 steel in the as-rolled condition. Investigation The end of the broken shaft containing the keyway was visually examined ( Fig. 1 ). The keyway extended into a shoulder at a change in diameter; chatter marks, rough-machining...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001849
EISBN: 978-1-62708-241-9
..., resulting in severe work roll damage as well as machine downtime and increased maintenance costs. work rolls fracture surface-initiated spalling cast steel beach marks shear ledges (chevron rays) ratchet marks heat checks SEM fractography strain rate maximum shear stress H13 (chromium hot...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047105
EISBN: 978-1-62708-225-9
... 4140 plate and heat treated to 34 to 36 HRC. Fig. 1 Failure of a 4140 steel locking collar machined from rolled plate. (a) Collar assembly showing fracture location. (b) Illustration of the failure with respect to the plate orientation. (c) SEM micrograph showing the cleavage-failure mode. (d...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089338
EISBN: 978-1-62708-224-2
... that the lifting eye failed as a result of overload. Fracture occurred parallel to the rolling direction, through manganese sulfide stringers and ferrite bands in the base metal matrix. The eye was machined from grade 1144 steel that was heavily cold rolled for strength. This material is very anisotropic...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006834
EISBN: 978-1-62708-329-4
.... This article also intends to give a nonexhaustive view of the preventive side of the failure analysis of REBs and of some of the recent developments in terms of materials and surface engineering. Rolling-Element Bearings Rolling-element bearings are high-tech machine elements that use rolling elements...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047125
EISBN: 978-1-62708-217-4
...Abstract Abstract A commercial aircraft wheel half, machined from an aluminum alloy 2014 forging that had been heat treated to the T6 temper, was removed from service because a crack was discovered in the area of the grease-dam radius during a routine inspection. Neither the total number...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047964
EISBN: 978-1-62708-223-5
..., the spindle of the grinding machine was reconditioned to eliminate the undulations and retained austenite was minimized by careful heat treatment. Bevel gears Cracks Gear boxes Magnetic particle testing Spalling Surface grinding 8620 UNS G86200 Rolling-contact wear The service life...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... between the rolling elements (balls or rollers) and the raceways. Although the stresses involved appear to be compressive only, just below the surface there are high shear stresses and low tensile stresses. Subsurface stresses are described in more detail later in this article. Repeated stressing in shear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0001784
EISBN: 978-1-62708-218-1
... Table 1 Fatigue strength of heat-treated wrought steel of various Brinell hardness ranges Hardness, HB Nominal tensile strength Nominal yield strength Fatigue strength at 10 6 cycles Type of surface Ground Machined Hot rolled Forged MPa ksi MPa ksi MPa ksi MPa ksi MPa ksi...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047840
EISBN: 978-1-62708-223-5
... discharge machining Rockwell hardness AZ UNS T30102 Metalworking-related failures Fatigue fracture The mandrel shown in Fig. 1 was part of a rolling tool used for mechanically joining two tubes before they were installed in a nuclear reactor. The operation consisted of expanding the end...