Criteria for determining machinability and techniques of improving machinability of steel and alloys

It has been established that during of steel and other work materials there is a definite cutting speed at which chip-tool-contact changes abruptly from contact with built-up-edge (BUE) formation to contact without BUE formation. This cutting speed has been termed as critical cutting speed, Vc. Inte...

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Main Author:	Amin, A. K. M. Nurul
Format:	Conference or Workshop Item
Language:	English
Published:	1993
Subjects:	TS200 Metal manufactures. Metalworking
Online Access:	http://irep.iium.edu.my/29506/ http://irep.iium.edu.my/29506/1/1993_Criteria_for_determining_machinability_and_techniques_of_improving_machinability_of_steel_and_alloys.pdf

id	iium-29506
recordtype	eprints
spelling	iium-295062013-07-19T02:14:13Z http://irep.iium.edu.my/29506/ Criteria for determining machinability and techniques of improving machinability of steel and alloys Amin, A. K. M. Nurul TS200 Metal manufactures. Metalworking It has been established that during of steel and other work materials there is a definite cutting speed at which chip-tool-contact changes abruptly from contact with built-up-edge (BUE) formation to contact without BUE formation. This cutting speed has been termed as critical cutting speed, Vc. Intensity of wear of a tungsten carbide tool is minimum at a speed slightly lower that Vc, when a soft BUE protects the tool from intensive wear. In case of with Tungsten-Titanium carbide tool there is a second cutting speed, slightly above Vc at which a second peak of tool life is observed. These speeds have been referred to as optimum cutting speeds, Vopt1, and Vopt2 respectively. Since both these speeds have definite relationship with the critical cutting speed, Vc which has a specific value for every pair of work and tool materials and conditions of cutting, so the speed Vc may be used on an important criteria for determining machinability of work materials. Three different methods of determining cutting speed Vc has been discussed in this paper. Two different methods of improving machinability of steel has been discussed in the paper. In the first method machinability has been improved by micro-alloying of steel with calcium, which leads to a considerable shift of V towards higher cutting speed (by approximately 140%). The reasons for this improved machinability have been explained in the paper. In the second method low machinability of Titanium alloys and heat resistant steel, associated with instability of chip formation leading to micro and macro chipping of the tool is overcome by preheating of these materials to optimum temperatures. Preheating considerably raises tool life due to lower amplitude and average value of cutting force and higher chiptool contact length resulting in lower stress, acting on the tool tip. 1993 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/29506/1/1993_Criteria_for_determining_machinability_and_techniques_of_improving_machinability_of_steel_and_alloys.pdf Amin, A. K. M. Nurul (1993) Criteria for determining machinability and techniques of improving machinability of steel and alloys. In: Proceedings of the International Conference on Advances in Materials and Processing Technologies (AMPT '93), 24 - 27 August 1993.
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TS200 Metal manufactures. Metalworking
spellingShingle	TS200 Metal manufactures. Metalworking Amin, A. K. M. Nurul Criteria for determining machinability and techniques of improving machinability of steel and alloys
description	It has been established that during of steel and other work materials there is a definite cutting speed at which chip-tool-contact changes abruptly from contact with built-up-edge (BUE) formation to contact without BUE formation. This cutting speed has been termed as critical cutting speed, Vc. Intensity of wear of a tungsten carbide tool is minimum at a speed slightly lower that Vc, when a soft BUE protects the tool from intensive wear. In case of with Tungsten-Titanium carbide tool there is a second cutting speed, slightly above Vc at which a second peak of tool life is observed. These speeds have been referred to as optimum cutting speeds, Vopt1, and Vopt2 respectively. Since both these speeds have definite relationship with the critical cutting speed, Vc which has a specific value for every pair of work and tool materials and conditions of cutting, so the speed Vc may be used on an important criteria for determining machinability of work materials. Three different methods of determining cutting speed Vc has been discussed in this paper. Two different methods of improving machinability of steel has been discussed in the paper. In the first method machinability has been improved by micro-alloying of steel with calcium, which leads to a considerable shift of V towards higher cutting speed (by approximately 140%). The reasons for this improved machinability have been explained in the paper. In the second method low machinability of Titanium alloys and heat resistant steel, associated with instability of chip formation leading to micro and macro chipping of the tool is overcome by preheating of these materials to optimum temperatures. Preheating considerably raises tool life due to lower amplitude and average value of cutting force and higher chiptool contact length resulting in lower stress, acting on the tool tip.
format	Conference or Workshop Item
author	Amin, A. K. M. Nurul
author_facet	Amin, A. K. M. Nurul
author_sort	Amin, A. K. M. Nurul
title	Criteria for determining machinability and techniques of improving machinability of steel and alloys
title_short	Criteria for determining machinability and techniques of improving machinability of steel and alloys
title_full	Criteria for determining machinability and techniques of improving machinability of steel and alloys
title_fullStr	Criteria for determining machinability and techniques of improving machinability of steel and alloys
title_full_unstemmed	Criteria for determining machinability and techniques of improving machinability of steel and alloys
title_sort	criteria for determining machinability and techniques of improving machinability of steel and alloys
publishDate	1993
url	http://irep.iium.edu.my/29506/ http://irep.iium.edu.my/29506/1/1993_Criteria_for_determining_machinability_and_techniques_of_improving_machinability_of_steel_and_alloys.pdf
first_indexed	2023-09-18T20:43:19Z
last_indexed	2023-09-18T20:43:19Z
_version_	1777409509824659456

Criteria for determining machinability and techniques of improving machinability of steel and alloys

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