Dynamics of drill bits with cutting edges of varying parameters

Zoltan Dombovari, G. Stépán

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In the metal cutting industry it is well known that milling processes can be stabilized by applying different strategies in order to destroy the pure single delay regeneration that arise in case of conventional milling tools when high material removal rates are used either at low or at high cutting speeds. To achieve this goal, variable pitch angle, variable helix angle and serrated tools are already available in the market and serve alternative solutions for process designers to enhance milling process stability. Regeneration can occur and can cause instability on the tip of the deep drilling equipment when the drill bit is driven across hard earth crust materials. This work shows that theories introduced for milling processes can be implemented to improve the stability properties of deep drilling processes, too. Unlike in case of most milling processes, however, the stability properties of deep drilling are affected by the longitudinal and the torsional vibration modes. In this paper, the geometrical and mechanical models are derived for drill bits with general shapes of cutting edges and it is shown that the two DOF dynamics can be described by distributed state dependent delay differential equations. The stability properties are characterized in stability diagrams that can help to select the optimal drilling process parameters.

Original languageEnglish
Title of host publication9th International Conference on Multibody Systems, Nonlinear Dynamics, and Control
PublisherAmerican Society of Mechanical Engineers
Volume7 B
ISBN (Print)9780791855973
DOIs
Publication statusPublished - 2013
EventASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2013 - Portland, OR, United States
Duration: Aug 4 2013Aug 7 2013

Other

OtherASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2013
CountryUnited States
CityPortland, OR
Period8/4/138/7/13

Fingerprint

Drilling
Regeneration
Drilling equipment
Torsional Vibration
State-dependent Delay
Angle
Metal cutting
Milling (machining)
Distributed Delay
Process Parameters
Helix
Delay Differential Equations
Differential equations
Diagram
Metals
Earth (planet)
Industry
Alternatives
Model

ASJC Scopus subject areas

  • Mechanical Engineering
  • Computer Graphics and Computer-Aided Design
  • Computer Science Applications
  • Modelling and Simulation

Cite this

Dombovari, Z., & Stépán, G. (2013). Dynamics of drill bits with cutting edges of varying parameters. In 9th International Conference on Multibody Systems, Nonlinear Dynamics, and Control (Vol. 7 B). [V07BT10A064] American Society of Mechanical Engineers. https://doi.org/10.1115/DETC2013-12594

Dynamics of drill bits with cutting edges of varying parameters. / Dombovari, Zoltan; Stépán, G.

9th International Conference on Multibody Systems, Nonlinear Dynamics, and Control. Vol. 7 B American Society of Mechanical Engineers, 2013. V07BT10A064.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Dombovari, Z & Stépán, G 2013, Dynamics of drill bits with cutting edges of varying parameters. in 9th International Conference on Multibody Systems, Nonlinear Dynamics, and Control. vol. 7 B, V07BT10A064, American Society of Mechanical Engineers, ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2013, Portland, OR, United States, 8/4/13. https://doi.org/10.1115/DETC2013-12594
Dombovari Z, Stépán G. Dynamics of drill bits with cutting edges of varying parameters. In 9th International Conference on Multibody Systems, Nonlinear Dynamics, and Control. Vol. 7 B. American Society of Mechanical Engineers. 2013. V07BT10A064 https://doi.org/10.1115/DETC2013-12594
Dombovari, Zoltan ; Stépán, G. / Dynamics of drill bits with cutting edges of varying parameters. 9th International Conference on Multibody Systems, Nonlinear Dynamics, and Control. Vol. 7 B American Society of Mechanical Engineers, 2013.
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