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numerical control machining

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Published: 15 May 2022
Fig. 8 Parts that were computer numerical control machined from slab stock based on modified computer-aided design files More
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
.... This high nonuniform loading, in conjunction with grinding cracks, was sufficient to produce spalling. Corrective Measures The spindle of the grinding machine was reconditioned to eliminate the five equally spaced undulations. Heat treatment of this gear was more carefully controlled to minimize...
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
... 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 A steel relay valve guide component operating...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001380
EISBN: 978-1-62708-215-0
... evidence of corrosion pits and machining marks. A representative macrograph of the fracture surface of the failed bolt is shown in Fig. 3 . The cadmium plating circumventing the fracture was blistered and worn away entirely in numerous locations, exposing a bare metal surface to the environment...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001078
EISBN: 978-1-62708-214-3
... machine. The gear motion is transmitted from a speed-reducing device with controlled, adjustable timing to produce proper fit of the valve closure. Pertinent Specifications The material that is specifically recommended for low-speed gear and high-load carry-in capacity corresponds to ASTM standard...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006912
EISBN: 978-1-62708-395-9
...-styrene 3D-printed prototype The machined polycarbonate parts in Fig. 8 were modified from the actual injection-molded production parts to cost-effectively machine them for dynamic testing. Fig. 8 Parts that were computer numerical control machined from slab stock based on modified...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001615
EISBN: 978-1-62708-235-8
... Abstract Carbon steel axle forgings were rejected due to internal cracks observed during final machining. To determine the cause of the cracks, the preforms of the forging were analyzed in detail at each stage of the forging. The analysis revealed a large central burst in the intermediate stage...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001350
EISBN: 978-1-62708-215-0
... boundary and in the shell of nozzle 2 Pertinent Specifications The tank was fabricated in accordance with the section of the ASME Pressure Vessel Code that applies to nuclear components. Every stage of the fabrication was stringently controlled, as were the choice of parent metal and filler wires...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001079
EISBN: 978-1-62708-214-3
... Abstract Numerous flaws were detected in a steam turbine rotor during a scheduled inspection and maintenance outage. A fracture-mechanics-based analysis of the flaws showed that the rotor could not be safely returned to service. Material, samples from the bore were analyzed to evaluate...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001366
EISBN: 978-1-62708-215-0
... analysis indicated that the fatigue loading probably had been caused by forced excitation, resulting in the impeller vibrating at its resonant frequency. It was recommended that the impeller design, control systems, and material of construction be changed. Airfoils Turbines Vanes 7075-T6 AMS 4126...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006838
EISBN: 978-1-62708-329-4
... to a machine, and control the build. A solid model is obtained by computer-aided-design software or 3D object scanners, and the part is additively built, typically layer upon layer, into the precise geometric shapes of the digital model. Polymers were used first in the development of modern AM technology...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001030
EISBN: 978-1-62708-214-3
...). Control of machining parameters to prevent formation of brittle martensite, use of galvanically compatible fasteners, and use of an alternate lubricant were recommended. Airframes, corrosion Fasteners Jet planes Marine environments Military planes Solid lubricants Ti-6Al-4V UNS R56406 Stress...
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
... and wear resistance. Influence of Machining Machining problems are a common cause of tool and die failures. It is generally best to avoid machining directly to the finish size unless a prehardened die steel is used. It is difficult to obtain perfect control of surface chemistry and size during heat...
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
... as an accelerated method to measure the RCF of bearing steels. The influence of lubrication type on steel ball RCF was also evaluated using the machine ( Ref 33 , 34 , 35 ). The Institute of Petroleum gathered numerous papers ( Ref 36 ) that describe various test results, ball dynamics, and kinematics using...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001592
EISBN: 978-1-62708-228-0
... developed to control and avoid those failures. This study presents various failure cases of sucker rods in different applications. The heat treatment of the steel material and the resulting microstructure are an important factor in the behavior of the sucker rod. A spheroidized microstructure presents...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
... to deliver material to the extruder at a set rate; this is known as starve feeding. Volumetric feeders rely on a displacement principle to create a discharge stream. They discharge the material to the extruder with a rotating auger, rotary feeder, or vibrating tray/belt at a rate controlled by the speed...
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
... the required toughness and wear resistance. Influence of Machining Machining problems are a common cause of tool and die failures. It is generally best to avoid machining directly to the finish size unless a prehardened die steel is used. It is difficult to obtain perfect control of surface chemistry...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... the average number of cycles to failure is N i , is assumed to cause an amount of fatigue damage that is measured by the cumulative cycle-ratio n i / N i , and failure is assumed to occur when ∑( n i / N i ) = 1. However, this method is not applicable in all cases, and numerous alternative methods...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
... to failure for different maximum stress amplitudes, called the lifetime curve, is shifted several decades toward a longer lifetime compared to the S - N curve, depending on the severity of the stress spectrum. The life prediction based on this method is often disappointing; numerous alternative methods...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001632
EISBN: 978-1-62708-234-1
... Abstract A double-walled, hemispherical metal beam exit window made of alloy 718 developed a crack during service, leading to coolant leakage. The window had been exposed to radiation damage from 800 MeV protons and a cyclic stress from 600 MPa tensile to near zero induced by numerous...