The Experts below are selected from a list of 828 Experts worldwide ranked by ideXlab platform
Sutasn Thipprakmas - One of the best experts on this subject based on the ideXlab platform.
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improving wear resistance of sprocket parts using a fine blanking process
Wear, 2011Co-Authors: Sutasn ThipprakmasAbstract:A sprocket is a toothed wheel, commonly used in drive systems, to which the strength and wear resistance of the teeth are important. Sprockets are conventionally fashioned by hobbing, followed by heat treatment. However, the fine-blanking process has recently seen increasing use by sprocket manufacturers. The process of fine-blanking has the possibility of reducing the number of process operations, thus reducing production time and cost, as well as improving part quality and process repeatability. Because of the severe plastic deformation in fine-blanking process, the strength, hardness and wear resistance of parts can be improved. In this work, the surface hardness and wear resistance of a fine-blanked sprocket are compared with those of a sprocket made using the hobbing process. The source of the wear resistance improvement was identified via examination of the microstructure. The microstructure of the fine-blanked sprocket revealed an increasingly compressed and elongated grain structure, in which grain flow and orientation resulted in pronounced hardening across the tooth width. The wear resistance of the fine-blanked sprocket, as measured by the distance between the teeth and the radius at the tooth bottom, was greater than that of the hobbed and heat-treated sprocket. Based on the results, the material cost of the sprocket could be reduced by using low carbon steel (SS400) instead of medium carbon steel (S50C), and further savings in production time would be realized by eliminating the need for subsequent heat treatment.
Andreas Mandelis - One of the best experts on this subject based on the ideXlab platform.
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laser photothermal non destructive inspection method for hairline crack detection in unsintered automotive parts a statistical approach
Ndt & E International, 2010Co-Authors: J Tolev, Andreas MandelisAbstract:Abstract A statistical non-contacting and non-intrusive method for revealing the presence of cracks in unsintered (green) parts manufactured by powder metallurgy (PM) technology was developed based on photothermal radiometry (PTR). The technique relies on the interaction of a modulated laser-generated thermal wave with the crack resulting in change of amplitude and phase of the detected signal. The crack existence at points in high stress regions of a group of green Sprockets was evaluated through the proposed method. The results were validated by an independent destructive technique—microscope observation of the tested green Sprockets following sintering, sectioning, and polishing at the locations where signal changes were observed in the green state. Statistical analysis confirmed the excellent sensitivity (91%) of the method in detecting the presence of hairline (∼5–10 μm) cracks. This PTR diagnostic technique may lead to a simple and reliable on-line inspection methodology in high-stress locations of PM manufactured industrial steel products. Ultimately, the method can be developed for non-destructive quality and feedback control of the metal forming process of green automotive parts.
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laser photothermal non destructive metrology of cracks in un sintered powder metallurgy manufactured automotive transmission Sprockets
Journal of Physics: Conference Series, 2010Co-Authors: J Tolev, Andreas MandelisAbstract:A non-contact and non-intrusive method of revealing crack presence in un-sintered (green) automotive transmission parts (Sprockets), manufactured by means of a powder metallurgy technology based on analysis of photo-thermal radiometric (PTR) signals and their statistical analysis was developed. The inspection methodology relies on the interaction of a modulated laser generated thermal wave with the potential crack and the resulting change in amplitude and phase of the detected signal [1-5]. The crack existence at points in high stress regions of a group of green (unsintered) Sprockets was evaluated through frequency scans. The results were validated by independent destructive cross-sectioning of the Sprockets following sintering and polishing. Examination of the sectioned Sprockets under a microscope at the locations where signal changes was used for correlation with the PTR signals. Statistical analysis confirmed the capabilities of the method to detect the presence of hairline cracks (~5 − 10 μm size) with excellent sensitivity (91%) and good accuracy (78%) and specificity (61%). This measurement technique and the associated statistical analysis can be used as a simple and reliable on-line inspection methodology of industrial powder metallurgy manufactured steel products for non-destructive quality and feedback control of the parts forming process.
J Tolev - One of the best experts on this subject based on the ideXlab platform.
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laser photothermal non destructive inspection method for hairline crack detection in unsintered automotive parts a statistical approach
Ndt & E International, 2010Co-Authors: J Tolev, Andreas MandelisAbstract:Abstract A statistical non-contacting and non-intrusive method for revealing the presence of cracks in unsintered (green) parts manufactured by powder metallurgy (PM) technology was developed based on photothermal radiometry (PTR). The technique relies on the interaction of a modulated laser-generated thermal wave with the crack resulting in change of amplitude and phase of the detected signal. The crack existence at points in high stress regions of a group of green Sprockets was evaluated through the proposed method. The results were validated by an independent destructive technique—microscope observation of the tested green Sprockets following sintering, sectioning, and polishing at the locations where signal changes were observed in the green state. Statistical analysis confirmed the excellent sensitivity (91%) of the method in detecting the presence of hairline (∼5–10 μm) cracks. This PTR diagnostic technique may lead to a simple and reliable on-line inspection methodology in high-stress locations of PM manufactured industrial steel products. Ultimately, the method can be developed for non-destructive quality and feedback control of the metal forming process of green automotive parts.
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laser photothermal non destructive metrology of cracks in un sintered powder metallurgy manufactured automotive transmission Sprockets
Journal of Physics: Conference Series, 2010Co-Authors: J Tolev, Andreas MandelisAbstract:A non-contact and non-intrusive method of revealing crack presence in un-sintered (green) automotive transmission parts (Sprockets), manufactured by means of a powder metallurgy technology based on analysis of photo-thermal radiometric (PTR) signals and their statistical analysis was developed. The inspection methodology relies on the interaction of a modulated laser generated thermal wave with the potential crack and the resulting change in amplitude and phase of the detected signal [1-5]. The crack existence at points in high stress regions of a group of green (unsintered) Sprockets was evaluated through frequency scans. The results were validated by independent destructive cross-sectioning of the Sprockets following sintering and polishing. Examination of the sectioned Sprockets under a microscope at the locations where signal changes was used for correlation with the PTR signals. Statistical analysis confirmed the capabilities of the method to detect the presence of hairline cracks (~5 − 10 μm size) with excellent sensitivity (91%) and good accuracy (78%) and specificity (61%). This measurement technique and the associated statistical analysis can be used as a simple and reliable on-line inspection methodology of industrial powder metallurgy manufactured steel products for non-destructive quality and feedback control of the parts forming process.
Martin Dionne - One of the best experts on this subject based on the ideXlab platform.
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an integrated approach to the characterization of powder metallurgy components performance during green machining
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: Etienne Robertperron, Carl Blais, Sylvain Pelletier, Yannig Thomas, Martin DionneAbstract:Green machining of powder metallurgy (P/M) components appears as an interesting procedure to solve the eternal problems associated with the poor machining behaviour of porous metallic samples. With the increasing usage of sinter-hardenable powders for high performance applications, green machining is an attractive method to lower production costs and compete against other shaping processes. Green machining is not a straightforward procedure. There is quite more to control in green machining than the cutting parameters. Several variables must be optimized to obtain adequate results in terms of surface finish, geometrical conformance and productivity. Other considerations such as density gradients in green compacts also influence the final outcome of this process. This study presents a new technique, based on cutting force measurements during green turning, to quickly and precisely characterize density gradients in powder metallurgy components. This new technique also allows the characterization of green machinability. Moreover, this study shows that timing Sprockets can be produced by green machining of gear blanks. Timing Sprockets produced by this process show a surface finish comparable to that of powder metallurgy components machined after sintering.
Georgy Vladimirovich Kurapov - One of the best experts on this subject based on the ideXlab platform.
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INVOLUTE CHAIN TRANSMISSION Sprockets
'FSFEI HE Don State Technical University', 2018Co-Authors: Sergey Borisovich Berezhnoy, Andrey Alexandrovich Voyna, Georgy Vladimirovich KurapovAbstract:A method of manufacturing involute sprocket by a standard cutter for the toothed chain is suggested. The application of involute Sprockets compared with straight and standard tooth profiles has a number of advantages: noise abatement under operation, wear resistance and durability increase, etc. The selection order of a standard cutter (hob gear) for cutting involute Sprockets is presented. A computer program simulating the sprocket cutting process with different values of the chain pitch and various numbers of teeth is developed. The resource allows determining the tool module, and inspecting tooth for sharpening and facing. The characteristic feature of cutting Sprockets with the involute tooth profile is the application of two corrections (radial and tangential). Their computation procedure is presented. The calculations for the chain pitch tц = 12.7 mm are carried out. The results are summarized in the table. The range of cutting involute Sprockets with a standard cutter by the chain pitch tц, the module (m), and the number of sprocket teeth (z) is determined including the need to eliminate tooth sharpening and facing
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DETERMINING LOCATION RADII OF GEAR CHAIN PIVOT LOCUS ON INVOLUTE SPROCKET WRAPS
'Infra-M Academic Publishing House', 2018Co-Authors: Sergey Borisovich Berezhnoy, Andrey Alexandrovich Voyna, Georgy Vladimirovich KurapovAbstract:The methods of calculating the location radii of the gear chain pivot locus on the wraps of involute Sprockets are suggested. The methods involve a step - by - step “placing” of the chain loops on the sprocket. To determine the chain joints location, surface equidistance of the operating and back tooth profiles which represent the c hain pivot locus upon their contact with the sprocket tooth profiles is used. The location radii of the pivot locus o n the involute sprocket wrap can be defined through the predete r mined position of the first joint, the known length values of the gear chain contact link pitches, and the slack side pretension. The study results allow presenting t he methods of calculating t he gear chain pivot l o cus on the wraps of involute Sprockets and the mathematical model algorithm of the chain gearing with involute Sprockets. The methods can be used to determine setting of the chain belt with toothed chain providing the minimal we ar - out of the gearing elements
