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Influence of inserts coating and substrate on TooloxR44 machining
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0003-2511-7267
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
2007 (English)Conference paper (Refereed)
Abstract [en]

The objective of the research presented in this paper is to characterize the machinability of TOOLOX 44 during cutting with PALBIT inserts with focus on how different combinations of coatings and substrates influence the machining process in aspects such as tool life, cutting forces, temperature and chip forming process.

The foremost result is that TOOLOX is machinable and when the right tool is chosen high productivity can be achieved. Using the right insert, equipped with chipbreaker, should allow to machine this hardened steel even at higher cutting speeds than the ones used in this investigation.

Place, publisher, year, edition, pages
Keyword [en]
Hard turning, tool life, cutting force, coating, substrate
National Category
Production Engineering, Human Work Science and Ergonomics
URN: urn:nbn:se:kth:diva-8590OAI: diva2:13953
Swedish Production Symposium '07

QC 20101109

Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2015-05-12Bibliographically approved
In thesis
1. Theoretical and experimental study of tooling systems: passive control of machining vibration
Open this publication in new window or tab >>Theoretical and experimental study of tooling systems: passive control of machining vibration
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Vibration control has been and still remains a subject of primary importance in modern manufacturing industry. To be able to remove high volumes of material in shorter time as well as to be able to get the right quality of the parts at the first time are goals that many shops would like to achieve. Tooling systems, and especially cantilever tools, and cantilever structural units of machine tools are the least rigid components of machining systems and therefore the most prone to vibration. Boring tools are often encountered as rotating tools in machining centres or as stationary tools in internal turning. In this thesis the focus is on internal turning. Internal turning is widely known as a very delicate operation and it is often carried out with cutting parameters far from optimal, from a productivity point of view, due to limitations imposed by vibration. Another type of tooling system whose functionality is impaired by vibration is the parting-off tool. The design of damped parting-off tool is one of the focus of this thesis as well. Vibration control has the purpose to achieve an efficient energy dissipation of a vibrational system. Basically this is achieved by controlling the damping of the system. Since damping involves the conversion of energy associated with a vibration to other forms, there are several mechanisms to remove energy from a vibrating system. Typically these mechanisms are divided in two classes:

1. Mechanisms that convert mechanical energy to heat, i.e. passive damping.

2. Mechanisms that transport energy away from vibrating systems, i.e. active damping.

Both these techniques have been used during the years and both have been giving excellent results. The active vibration control mechanisms are more expensive and not suitable for machining due to the cables they necessitate that could interfere with the machining operation. This work proposes an original approach to vibration damping in machining systems, the objects of vibration dissipation being the structural components on the link between turret and cutting insert. The idea is to use composite materials to create damping interfaces between and within the different structural components. Different clamping system designs are being compared in order to see how these influence the performance of the machining system and different cutting inserts have been compared for machining hardened steel. The newly designed components have been going through both extensive off-line (modal analysis) and on-line dynamic testing (machining test) and the results show that the new tool holders used in combination with hydrostatic clamping system are the most optimal solution among the tested ones. The new design for the turret has been giving promising results and more can be achieved by bringing minor changes to it, these changes are being implemented at the time of writing this thesis.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xi, 55 p.
Trita-IIP, ISSN 1650-1888 ; 08-04
National Category
Production Engineering, Human Work Science and Ergonomics
urn:nbn:se:kth:diva-4787 (URN)
2008-06-12, Sal M311, Brinellsalen, KTH, Brinellvägen 68, Stockholm, 10:00
QC 20101109Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2010-11-09Bibliographically approved

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