1-20 of 68 Search Results for

thread-rolling machines

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
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
... requirements. Second, macroetching showed that the bolts has been machined from stock rather than forged, and the threads cut rather than rolled. It was also determined that hydrogen-assisted stress-corrosion cracking also played a part in the failure of the high-strength bolts. Missile launchers...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001378
EISBN: 978-1-62708-215-0
... be rotated by a special wrench that would avoid contact with the clevis. A centrally located eyebolt might also be considered. Rolled threads would be preferred to the existing machine-cut threads. An increased lateral load could be produced when a wide stud bolt spacing is used with short slings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001259
EISBN: 978-1-62708-233-4
... and when notches were machined instead of beaten with a chisel. Bolts Decarburizing Overheating Wire 41Cr 4 Heat treating-related failures A bolt manufacturer complained that wires of steel 41 Cr4 of certain shipments were prone to formation of quench cracks in the rolled threads. Since...
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
... analysis, microhardness and tensile testing, stress calculations, and vibration measurements. Based on the results, the roll fracture was attributed to high-cycle fatigue associated with a plug weld over one of the five threaded fasteners added to secure a balance weight inside the roll. The balance weight...
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
... pearlite matrix, large graphite flakes (arrow A), manganese sulfide inclusions (arrow B), and silicate inclusions (arrow C). Etched with nital. 150× Investigation Visual examination of the flange disclosed that the fracture was circumferential, extending diagonally from the threaded interior...
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
... the tool. The fracture progressed into the threaded section and formed a pyramid-shape fragment after it was initiated at approximately 45 deg through the hole in the square end. An irregular zone of untempered martensite with cracks radiating from the surface of the hole (result of melting around hole...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001173
EISBN: 978-1-62708-218-1
...Abstract Abstract Ball joints made from carburized En 353 (BS970:815A16) steel failed after several hours of being fitted into vehicles. The parts were forged, machined, and thread rolled. The threads were copper plated to prevent carburization. The heat treatment consisted of carburizing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001583
EISBN: 978-1-62708-217-4
...” material significantly increased. Outcome As a result of this investigation, AMCOM has changed the drawing requirements for this component to include rolled threads, rather than machined, as well as an increase to the minimum allowable strength level. Recommendation In order to obtain...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001703
EISBN: 978-1-62708-227-3
... that the threads were machined rather than rolled. Fig. 7 Microstructure of cracked stud (×360). Scanning Electron Microscopy There was noticeable pitting along the flanks near the bottom of the thread groove at the point where the crack started ( Figure 8 ). Only isolated pits were found on other...
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
... eye that had fractured in two locations during service The eye was approximately 70 mm (2.75 in.) long and appeared to be machined. Fracture occurred in two locations: adjacent to the threaded shank and diametrically opposite to this region. The circular eye was deformed longitudinally...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001098
EISBN: 978-1-62708-214-3
... shows the typical microstructure of the cap screws, consisting of quenched and tempered martensite. Figure 8 shows the typical thread root conditions. The lack of orientation of the microstructure at the thread roots indicates that the threads were likely machined rather than rolled. Fig. 7...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001287
EISBN: 978-1-62708-215-0
... be roll threaded. Selected Reference Selected Reference • Fatigue Failures , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 , p 700 – 727 10.31399/asm.hb.v11.a0003544 ...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001678
EISBN: 978-1-62708-218-1
... one of several grades of carbon or alloy steels. Fatigue is the most common mechanism of failure in fasteners but sometimes more than one cause is involved in fracture, whether it is ductile or brittle. The most common locations for threaded fasteners to fracture are either in the head-to-shank-fillet...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
..., and threaded sections are often points of initiation of cracks. Small fillets, sharp corners, grooves, and threads act as stress raisers from which fatigue cracks initiate and fractures propagate. Correct design of a threaded shank on a hook, for example, and the stress-relief groove at the base of a threaded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048607
EISBN: 978-1-62708-225-9
...), and intergranular fracture with corrosive residue (e). Electron fractographs of unetched specimens. 6500× The examination also showed that the threads on some of the bolts had been produced by cutting, and on others by rolling. Both types of threads had fractured on the bolts in service. Longitudinal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... and with illustrative examples. Fatigue fracture in threaded fasteners and fretting in bolted machine parts are also discussed. The article provides a description of the different types of corrosion, such as atmospheric corrosion and liquid-immersion corrosion, in threaded fasteners. It also provides information...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006805
EISBN: 978-1-62708-329-4
... extent by using nuts of a softer material that will yield and distribute the load more uniformly over the engaged threads. Significant additional improvement in fatigue life is also obtained by rolling (cold working) the threads after heat treatment rather than cutting them, as suggested in Example 5...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006830
EISBN: 978-1-62708-329-4
... marks, and threaded sections often act as points of crack initiation. Small fillets, sharp corners, grooves, and threads act as stress raisers from which fatigue cracks initiate and fractures propagate. Correct design of a threaded shank on a hook, for example, and the stress-relief groove at the base...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006818
EISBN: 978-1-62708-329-4
... of failures in heat treatment and in service; they should be avoided. Quench-Crack Failures Two quench-crack failures promoted by machining problems have been illustrated. Quench cracking of the fixture shown in Fig. 4 was located by a nick in the fillet, while failure of the threaded part shown...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001814
EISBN: 978-1-62708-180-1
... of the threaded part shown in Fig. 5 was due to an undercut at the base of the threaded region. Rough machining marks areanother common cause of quench cracking. Figure 6 shows a punch made of AISI S7 tool steel that cracked during quenching. Because of the section size, the punch was oil quenched to 540...