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drill bit

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Image
Published: 01 January 2002
Fig. 16 A scanning electron micrograph of a hole drilled with a worn drill bit. Note that the final position of the hole is not where the drilling started (i.e., the drill wandered across the surface before “biting”) and the ragged nature of the periphery of the hole. More
Image
Published: 15 January 2021
Fig. 16 Scanning electron micrograph of a hole drilled with a worn drill bit. Note that the final position of the hole is not where the drilling started (i.e., the drill wandered across the surface before “biting”) and the ragged nature of the periphery of the hole. More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001787
EISBN: 978-1-62708-241-9
... Abstract A masonry type drill bit, designed for impact drilling in rock, fractured after a short time in service. Samples of the failed bit were analyzed using optical and scanning electron microscopy, quantitative metallography, and chemical analysis. The composition was found...
Image
Published: 01 December 2019
Fig. 1 The macromorphology of the drilling bit ( a ) the fracture surface; ( b ) the beach mark; ( c ) the crack of the tooth profile More
Image
Published: 01 December 2019
Fig. 4 SEM morphology of the inner hole of the drilling bit More
Image
Published: 01 December 2019
Fig. 9 The microstructure in the transverse direction section of the drilling bit More
Image
Published: 30 August 2021
Fig. 4 Undesirable altered surface caused by dull drill bits in holemaking. (a) Section perpendicular to the drilled hole axis in high-strength alloy steel. (b) Cross section through a hole made in stainless steel with a dull drill bit. Original magnification: ~20× More
Image
Published: 15 January 2021
Fig. 15 Scanning electron micrograph of the details of a hole drilled with a new, sharp drill bit. Note the clean hole with only a minor amount of damage to the hole periphery. More
Image
Published: 01 January 2002
Fig. 15 A scanning electron micrograph of the details of a hole drilled with a new, sharp drill bit. Note the clean hole with only a minor amount of damage to the hole periphery. More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003560
EISBN: 978-1-62708-180-1
..., such as bulldozer blades, excavator teeth, rock drill bits, crushers, slushers, ball mills and rod mills, chutes, slurry pumps, and cyclones. However, abrasive wear is not limited to these activities. Abrasion presents problems in many wear environments at one point or another, even though it may not be the primary...
Book Chapter

Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006790
EISBN: 978-1-62708-295-2
... is in the excavation, earth-moving, mining, and minerals-processing industries, where component deterioration occurs in a wide variety of equipment, such as bulldozer blades, excavator teeth, rock drill bits, crushers, slushers, ball mills and rod mills, chutes, slurry pumps, and cyclones. However, abrasive wear...
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
... be further reduced by strategic placement of the cutting fluid nozzles ( Fig. 2 ) ( Ref 5 ). Access holes in the body of milling cutters and drill bits that provide thorough-the-tool coolant flow improve the impingement of cutting fluid into the cutting zone and reduce rejection and workpiece production...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001519
EISBN: 978-1-62708-223-5
... an appreciable shear lip, which is characteristic of ductile overload failure (the cone part of the cup-cone fracture). The broken piece had a deep gouge on its side, probably inflicted by the drill bit. Based on these preliminary findings, it was suspected that the draw-in bolt was the first to fracture...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001384
EISBN: 978-1-62708-215-0
... ) displayed an appreciable shear lip, which is characteristic of ductile overload failure (the cone part of a cup-cone fracture). The broken piece contained a deep gouge on its side, probably inflicted by the drill-bit tool end. Fig. 3 SEM fractograph (a) of a field on the fracture surface shown in (b...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001702
EISBN: 978-1-62708-219-8
... measured using this instrument. Chloride Distribution Powder samples of the concrete were taken to determine chloride distribution in the beam as a function of distance from the beam surface. Samples were taken using a hammer drill, a hollow drill bit, a powder collector, and a vacuum cleaner...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003529
EISBN: 978-1-62708-180-1
... process would be a copper/nickel/chromium plating on a zinc die casting. Since the zinc is more soluble in acid than any of the plating layers, another approach is obviously required, such as sanding or drilling. Obviously, the odd shape of many products makes sampling difficult at best. Small specimens...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003504
EISBN: 978-1-62708-180-1
..., or masonry, at diameters in increments of 1 16 in., plus or minus 1 64 in, up to the length of the drill bit, in less than 30 s.” (Where no performance standard is given, an absolute standard will be inferred. For example, the function statement “to contain fluid,” without a maximum...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006817
EISBN: 978-1-62708-329-4
... case where this can be done). For example, the primary function of a household drill may be “to drill a hole in wood, metal, or masonry, at diameters in increments of 1 16 in., plus or minus 1 64 in., up to the length of the drill bit, in less than 30 s.” (Where no performance...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006759
EISBN: 978-1-62708-295-2
... should be prepared according to the technique being utilized. A flat and polished sample is ideal for XRF. For OES, a flat but somewhat rough sample is most suitable, such as a sample turned on a lathe with a roughing bit or ground with 60-grit grinding paper. ICP-OES requires chips for acid digestion...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
.... Source: Ref 11 The mechanisms occurring in a given impact case are determined by the stress and sliding conditions within the contact. For example, in high-strength tungsten carbide bits of rock drilling equipment, surface fatigue leads to the formation of spalls ( Ref 12 ). Repetitive impact...