An important component of the total production costs of forged parts are the costs for finish turning. During the last few years near-net - shape technology has been advanced, so that the realizable accuracy by chipless forming has been enhanced and cutting operations are necessary at connection surfaces. This can lead to discontinuous cutting processes caused by the varying depth of cut or interrupted cut. Results obtained from turning tests with continuous cutting cannot be used as a base for the machining of those forged parts. For a reduction of production costs of near-net-shape forged parts further investigations on machinability are necessary by adapted testing methods.
References
1.
EngineerS.HuchtemannB.SchülerV.An investigation of the effect of sulphur, tellurium and calcium on the machinability and the technological properties of engineering steels. First International Conference on the Behaviour of materials in machining, Stratford-upon-Avon, 8–10 November, 1988 (Institute of Metals, London).
2.
PalmaiZ.The effect of deoxidation of steel on machinability. Wear, 1976, 38, 1–16.
3.
AppleC. A.The relationship between inclusions and the machinability of steel. Thirty-first Mechanical working and steel Conference Proceedings, Chicago, USA, 22 October 1989 (American International Manufacturing Engineering).
4.
PöntinenH.PajuM.Effect of layer formation on the machinability of steels. Proceedings International Conference and Workshop on Factors influencing machining and their control, Cincinnati, USA, 12–14 September 1989, FinnH. E. (ASM International, Ohio, USA).
5.
TönshoffH. K.KaestnerW.SchnadtR.Metallurgische Auswirkungen der Calciumbehandlung von Stahlschemlzen auf die Bearbeitbarkeit. Stahl und Eisen, 1989, 109, (13), 651–660.
6.
EngineerS.HuchtemannB.SchülerN.A review of the development and application of microalloyed medium-carbon steels. Proceedings of Conference on Fundamentals of microalloying forging steels (Eds KraussG.BanjerjiS. K.), War-rendale, USA, 1987.
7.
NaylorD. J.Review of international activity on microalloyed engineering steels. Ironmaking and Steelmaking, 1989, 16, (4), 246–252.
8.
CristinacceM.JamesD. E.The development of microalloy steels at United Engineering Steels. ECSC sponsored information day on microalloyed engineering steels, Düsseldorf, 30 June 1988.
9.
NaylorD. J.The future for engineering steels. Ironmaking and Steelmaking, 1990, 17 (1), 17–25.
10.
NaylorD. J.Tool-life testing with single point turning tools. ISO 3685-1977 (E).
11.
LangeK.KemnaH. K.Probleme beim Vorbereiten und Spannen von Ge senkschmiedestücken zum Abspanen. Werkstattechnik und Maschinenbau, 1956, 45 (9), 434–442.
12.
LangeK.Die Arbeitsgenauigkeit beim Gesenkschmieden. Dr-Ingdissertation, TH Hannover 1953.
13.
LangeK.Cost minimization in small quantity production of stepped shafts by combined NC-radial forging and NC-turning. Ann. CIRP, 1985, 34 (2), 549–555.
14.
PatzkeM.Einfluß der Randzone auf die Zerspanbarkeit von Schmiedeteilen. Dr-Ing dissertation, Universität Hannover, 1987.
15.
TönshoffH. K.StanskeC. H.Material aspects in machining of forged parts. ASM International Conference, New Orleans, USA, 1985 (ASM International, Ohio, USA).
16.
LehwaldW.Prüfung von Hartmetallen im Hinblick auf die Schneidenbeanspruchung bei unterbrochenem Schnitt. Dr-Ing Dissertation, RWTH Aachen, 1962.
17.
BeckhausH.Einfluszlig; der Kontaktbedingungen auf das Standzeitverhalten von Fräswerkzeugen. Dr-Ing Dissertation, RWTH Aachen, 1969.
18.
PhilipP. K.Tool wear and tool life in intermittent cutting of hardened steel using conventional hardmetal inserts. Int. J. Mach. Tool Des. Res., 1978, 18, 19–28.
19.
PekelharingA. J.The exit failure in interrupted cutting. Ann. CIRP, 1978, 27 (1), 5–10.
20.
PekelharingA. J.The exit failure of cemented carbide face milling cutters. Ann. CIRP, 1984, 33 (1), 47–50.
21.
RottbergJ.LenzE.BraunS.Mechanical signature analysis in interrupted cutting. Ann. CIRP, 1987, 36 (1), 249–252.
22.
OkushimaK.HoshiT.Internal temperature distribution of the carbide fly cutting tool. Bull. Japan. Soc. Tech. Engrs, 1967, 10 (39), 566–573.
23.
YellowlyF.BarrowsG.The influence of thermal cycling on tool life in peripheral milling. Int. J. Mach. Tool Des. Res., 1976, 16, 1–12.
24.
OradyE.TlustyJ.Effect of thermal cycling on tool wear in milling. North American Manuf. Research Conference Proceedings. University Park, PA, USA, 19–22 May, 1981.
25.
TönshoffH. K.DenkenaB.Wear of ceramic tools in milling. STLE Annual Meeting, Denver, USA, 7–10 May, 1990, to be published in Trans. ASLE)..
26.
BhatiaS. M.PandeyP. C.ShanH. S.Thermal cracking of carbide tools during intermittent cutting. Wear, 1978, 51, 201–211.
27.
AsaT.NakatamiS.HarraA.Study of the early fracture of carbide tools for steel cutting (First report). Bull. Japan Soc. Prec. Engng, 1980, 14(1), 19–24.
28.
NegishiH.AokiK.SataT.Study on tool failure of carbide tools in interrupted turning. Ann. CIRP, 1980, 29 (1), 57–60.
29.
KunzH.KönigW.Cutting materials, classification and standardization. Ann. CIRP, 1987, 36 (2), 531–535.
30.
TonshoffH. K.KaestnerW.PatzkeM.Machinability of steel in discontinuous turning processes. First International Conference on the Behaviour of materials in machining, Stratford-upon-Avon, 8–10 November, 1988.
31.
TönshoffH. K.KaestnerW.Machinability of steel forgings and their economic production. Proceedings International Conference and Workshop on Factors influencing machining and their control, Cincinnati, USA, 12–14 September 1989 (Ed. FinnH. E.) (ASM International, Ohio, USA).
32.
KronenbergM.Analysis of initial contact of milling cutter and work in relation to tool life. Trans. ASME, April 1946, 217–228.
