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Electric discharge machining

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001120
EISBN: 978-1-62708-214-3
... at an electrical-discharge-machined surface where the resulting rehardened layer had not been removed. This rehardened layer had cracked, providing a source for fatigue initiation. Electrical discharge machining H13 UNS T20813 Fatigue fracture Metalworking-related failures Background Testing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047935
EISBN: 978-1-62708-225-9
... the spot was evidenced to have been melted and welded to the inner-ring raceway. It was revealed by randomly spaced welded areas on the raceways that the welding was the result of short electrical discharges between the bearing raceways and the balls. The use of an electrically nonconductive lubricant...
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...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006826
EISBN: 978-1-62708-329-4
... encountered under load in service ( Ref 12 ). Surface alterations generated during electrical discharge machining (EDM) metal alloys, such as cast Inconel 718 (aged to a hardness of 40 HRC), may cause undesired surface layers that increase the risk of component failure ( Fig. 7 ) ( Ref 2 ). The undesired...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001296
EISBN: 978-1-62708-215-0
... a stereoscopic microscope and/or a borescope. Aircraft components Airplanes Bearing steel Control valves Electric discharge machining Engine components Low-cycle fatigue 52000 Fatigue fracture Metalworking-related failures Brittle fracture Background Visual Examination of General Physical...
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
... the cracks. Original magnification: 0.5× Fig. 7 Surface of an AISI A4 primer cup plate showing spalling at one of the 3.2 mm (⅛ in.) diameter holes made by electrical discharge machining (EDM). The surface was etched with 10% aqueous nitric acid to bring out the influence of the EDM operation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001571
EISBN: 978-1-62708-229-7
... on the lower head was mapped, sampled and removed. In early 1988, MPR Associates Inc. (Alexandria, Virginia) was hired to remove metallurgical specimens from the lower head [ 4 ]. A remotely controlled electrical-discharge machining type device was designed to remove the specimens from the lower head while...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001796
EISBN: 978-1-62708-241-9
.... Investigators also examined the effect of electrical discharge on crater dimensions and density and the role that thermoelectric voltage potentials may have played. roller bearing electrical fluting bearing current bearing steel erosion microcraters scanning electron microscopy hydrodynamic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001458
EISBN: 978-1-62708-220-4
... by a movable bearing in a cast iron swan neck frame. The machine was one of several installed in a chemical works and was used to remove dilute nitric acid from lead nitrate. The discharge weight of crystals from the basket was approximately 6 cwts. after drying, the centrifuge being filled and discharged...
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
..., unconsolidated interiors, and carbide segregation and poor carbide morphology are reviewed with illustrations. brittle fracture carbide segregation die failure dies electrical discharge machining failure mechanisms finish grinding heat treatment hot working laps machining mechanical testing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... there was a vibration problem on the suction bottle of the compressor. Reciprocating compressors have suction and discharge bottles to absorb the pressure pulsations from the pistons. This is similar to adding a capacitor to an electrical circuit to absorb the voltage ripple. Because the compressor unit...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
...), and untempered martensite (arrow F). 2% nital etch. Original magnification: 100× Fig. 31 Type A2 tool steel mandrel for a tube-expanding tool (dimensions given in inches). Fracture originated at a 6.3 mm (0.25 in.) diameter hole in the square end that was drilled by electrical discharge machining...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006765
EISBN: 978-1-62708-295-2
..., and etching. The influence of microstructures on the failure of a material is discussed and examples of such work are given to illustrate the value of light microscopy. In addition, information on heat-treatment-related failures, fabrication-/machining-related failures, and service failures is provided...
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
... example, use of an electrically non-conductive grease prevented proper grounding. Example 1: Pitting Failure of Ball Bearings in an Electric Motor by Static Electrical Discharges The electric motor in an office machine was producing intermittent noise. Ball bearings were suspected as the source...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001828
EISBN: 978-1-62708-241-9
... completed under controlled laboratory conditions [ 3 – 5 ]. However, it is considered a difficult task to identify SCF even under controlled conditions. Identifying component failures under complex operating conditions in a rotating machine is certainly a challenging task. The relevant operating data may...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... grinding damage, machining marks or nicks, and quench cracks resulting from heat treating operations. Frequently, stress concentrators are introduced during hot or cold forming of shafts; these include surface discontinuities, such as laps, seams, pits and forging laps, and internal imperfections...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003519
EISBN: 978-1-62708-180-1
... attachment to look in holes and pin-light attachment to look in small crevices Conductivity tester Check conductivity or nonconductivity of surface Mirror Check around corners and under objects Surface-finish comparators Machine, cast, electrical discharge machining surface-finish standards...
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
... 50 120 Plane grinding machine 55 130 Railcar bearings 60 140 Screens 80 175 Hammer crushers 60 140 Stone crushers 80 175 Impact crushers 80 175 Vibration motors 70 160 Wire-drawing calendar 65 150 Paper machine drum 55 130 Electrical driving motor 80...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001900
EISBN: 978-1-62708-225-9
... in electric current passing through the bearing and causing arcing between the rolling elements. Because of the dynamic nature of the discharge the multiple arcing developed a pattern on the outer race known as ‘fluting’ ( Fig. 1 ). Fig. 1 Section of ball race outer showing the distinct banding...