CHIP FORMATION ANALYSIS IN HIGH-SPEED MACHINING OF A NICKEL-BASE SUPERALLOY WITH SILICON-CARBIDE WHISKER-REINFORCED ALUMINA

被引：17

作者：

GATTO, A ^{[1
]}

IULIANO, L ^{[1
]}

机构：

[1] UNIV ANCONA,DIPARTIMENTO SCI MAT & TERRA,I-60131 ANCONA,ITALY

来源：

INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE | 1994年 / 34卷 / 08期

关键词：

D O I：

10.1016/0890-6955(94)90019-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High speed turning tests were performed on a heat resistant alloy (Inconel 718), using SiC (20%) whiskers reinforced ceramic tools. The main aims of these tests were the following: (1) mapping cutting speed-feed and machined volume in order to find a region from tool breakage; (2) analysing tool wear and chip formation mechanisms; and (3) from the experimental results modelling analytically both chip formation processes and tool wear mechanism. Tool and chip were semiquantitative analyses were carried out to evaluate micro-welds on the chip and areas of welded or scattered material over the tool. Micro-hardness mapping was carried out on the longitudinal cross-section of the chips to monitor its dependence by process parameters. Variable wear mechanisms along the the tool-chip contact length that were attributed to variations in plastic deformation energy were observed. There variations were analytically modelled in orthogonal cutting conditions. Longitudinal and transverse shear planes into the chip were also observed. The causes and the mechanisms of wear, chip formation and the hardening of work material were deduced. The presence of whiskers pull out mechanisms due to temperature effects in the tool-chip interface were also observed.

引用

页码：1147 / 1161

页数：15

共 14 条

[1]

Whitney, Vaidyanathan, Engineered ceramics for high speed machining, Proc. of Advances in Tool Material for use in High Speed Machining, pp. 77-82, (1987)

[2]

Aspinwall, Richards, Use of ceramics tools for machining nickel based alloys, Int. J. Manufact, 29, pp. 575-588, (1989)

[3]

Venkatesh, High speed machining of cast iron and steel, Ann. CIRP, 1, pp. 387-390, (1966)

[4]

Ippolito, Tornincasa, Levi, High Speed Machining: Tool Performance and Surface Finish in Steel Turning, CIRP Annals - Manufacturing Technology, 1, pp. 105-109, (1988)

[5]

Schulz, Spur, High Speed Turn-Milling — A New Precision Manufacturing Technology for the Machining of Rotationally Symmetrical Workpieces, CIRP Annals - Manufacturing Technology, 1, pp. 107-111, (1990)

[6]

Schulz, Moriwaki, High-speed Machining, CIRP Annals - Manufacturing Technology, 2, pp. 637-641, (1992)

[7]

Sadat, Surface characteristic of machine Inconel 718 nickel base superalloy using natural and controlled contact length tools, Int. J. Mach. Tools Manufact., 27, pp. 333-342, (1987)

[8]

Engel, Klingele, An Atlas of Metal Damage, (1981)

[9]

Zorev, Metal Cutting Mechanics, (1966)

[10]

Oxley, Mechanics of Machining, (1986)

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