Machinability and microstructure of some common non-ferrous metals and alloys

Davies, Dominic

doi:10.1179/030716976803392105

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…In general, tool life increases with sulfur content, but the results show a wide scatter [33]. A closer correlation is obtained when the sulfide particle size distribution is considered.…”

Section: Free-machining Additives To Single Phase Alloyssupporting

confidence: 49%

“…Another important consideration in highly machinable alloys is the presence of hard particles [3,17,33,54,55]. Although, most second phase particles cause a reduction in shear strain to fracture, and would be expected to aid machinability, hard particles cause undue tool wear.…”

Section: Free-machining Additives To Multi-phase Alloysmentioning

confidence: 99%

“…Copper can be made free-machining by the additions of sulfur, tellurium, and selenium [33][34][35][36][37][38]. These additions form copper sulfides, tellurides, and selenides, respectively, and impart machinability at slight sacrifice of conductivity and ductility.…”

Section: Free-machining Additives To Single Phase Alloysmentioning

confidence: 99%

“…In a drilling operation, for minimum drill penetration time, optimum sulfur level has been found to be 0.4-0.5%, little improvement results at higher sulfur contents. For a similar performance, tellurium copper requires 0.55-0.65% tellurium [33]. Sulfur copper also has the advantage of higher scrap value, where tellurium is an undesirable impurity in most grades of copper-based alloys.…”

Section: Free-machining Additives To Single Phase Alloysmentioning

confidence: 99%

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A Review of the Machinability of Copper-Base Alloys

Kuyucak¹,

Sahoo²

1996

Canadian Metallurgical Quarterly

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Machining is widely used as the final shaping operation, and contributes significantly to the cost, of a manufactured product. As a result, it has been of paramount importance to develop easily "machinable" alloys with minimal sacrifice of other properties, to reduce the associated fabrication costs.Until now, leaded brasses have been the industry standard for "free-machining" copper-base alloys. However, health concerns about the useof lead in alloys, especially in plumbing applications, will restrict their use. This has created a need for an alternative free-machining copper-based alloy, without lead. MTL/CANMET has been involved in establishing such an alloy. The project was partially funded by the International Copper Association (lCA), and this review was undertaken to assist this effort to understand and summarize the data and concepts of the metal cutting process, assessment of machinability, and the metallurgical factors that contribute to an alloy's machinability, from the standpoint of copper-base alloys.Resume-L'usinage constitue, dans la plupart des cas, l'etape finale de la mise en forme et contribue considerablement au COlltdu produit manufacture. II s'ensuit que pour reduire les couts associes a la fabrication, il est primordial de mettre au point des alliages faciles a usiner en sacrifiant Ie moins possible les autres proprietes qu'ils possedent.Jusqu'a maintenant, dans l'industrie, les laitons au plomb ont constitue un etalon pour les alliages au cuivre facilement usinables. Toutefois, l'utilisation du plomb dans les alliages, en particulier dans les applications en plomberie, est source de preoccupations relatives a la sante, ce qui en limitera l'utilisation. Ce fait a cree Ie besoin d'un alliage de rechange au cuivre, sans plomb et facilement usinable. Les LTM et CANMET ont participe a l'eIaboration d'un tel alliage. Le projet a ete partiellement finance par l'International Copper Association (lCA). L'etude a ete entreprise dans Ie cadre de ces travaux en vue de comprendre et de resumer les donnees et concepts propres au procede de coupe des metaux, d'evaluer l'usinabilite de l'alliage et les facteurs metallurgiques qui contribuent a l'usinabilite d'un alliage, du point de vue des alliages au cuivre.

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“…In general, tool life increases with sulfur content, but the results show a wide scatter [33]. A closer correlation is obtained when the sulfide particle size distribution is considered.…”

Section: Free-machining Additives To Single Phase Alloyssupporting

confidence: 49%

Section: Free-machining Additives To Multi-phase Alloysmentioning

confidence: 99%

Section: Free-machining Additives To Single Phase Alloysmentioning

confidence: 99%

Section: Free-machining Additives To Single Phase Alloysmentioning

confidence: 99%

See 2 more Smart Citations

A Review of the Machinability of Copper-Base Alloys

Kuyucak¹,

Sahoo²

1996

Canadian Metallurgical Quarterly

View full text Add to dashboard Cite

show abstract

“…Furthermore, this interaction will alter the chip deformation after it leaves the cutting edge; it may also result in different chip lengths and shapes. 161 In one of the few studies carried out on drilling chip formation, Nakayama and Ogawa 162 reported that chip size in the drilling process is governed by its formation geometry at the cutting edge, as well as its thickness, curl, and characteristic length, as determined by the point at which the chip breaks in the generation cycle. Figure 2.11 shows the details of the three components of chip curl by indicating the following points.…”

Section: Chip Formation In Drillingmentioning

confidence: 99%