- Type of paper
: Paper in journal
Title: Face Turning on CNC Lathe
- Authors:
- Kuljanić, Elso (24585)
Journal: Annals of the CIRP
Number: 1
ISSN: 3-905
Volume: 40
Year: 1991
Pages: from 53 to 56
Number of references: 5
Language: engleski
Summary: This paper presents the results of a research on face
turning onCNC lathes at constant cutting speed and at constant
spindlerevolutions. In both cases the surface roughness is examined byusing
different machine tools, with different tools, and atdifferent cutting
conditions. A comparison is made of cuttingtimes in face turning at
constant cutting speed and at constantspindle revolutions. Furthermore,
this paper deals with acomparison of tool wear, tool life, the area of
machined surfaceand the chip form obtained at constant cutting speed and
atconstant spindle revolutions. The cutting time is shorter byapproximately
45% when face turning is done at constant cuttingspeed.
Keywords: Cutting, Face turning, CNC lathes, Productivity increase, Tool life, Surface roughness.
- Type of paper
: Paper in journal
Title: Macro Plastic Deformation of Cutting Edge - A Method for
Maximum Utilization of Cutting Tool
- Authors:
- Kuljanić, Elso (24585)
Journal: Annals of the CIRP
Number: 1
ISSN: 3-905
Volume: 41
Year: 1992
Pages: from 151 to 154
Number of references: 6
Language: engleski
Summary: This paper investigates the macro plastic deformation of
thecutting edge and the material near the cutting edge in roughturning. It
was found that the macro plastic deformation takesplace approximately three
seconds after the start of cutting,when the single point cutting tool is
not able to cut properly,the surface roughness of the machined surface
increases andvibrations appear. A method for maximum utilization of
singlepoint cutting tool and tool selection for rough turning, groovingetc.
by using the information about the macro plastic deformationof the cutting
edge are proposed. Both the way of measuring themacro plastic deformation
and how the macro plastic deformationcan be detected by means of feed
cutting force is presented.Acoustic emission sensors or sensors systems
could be used fordetecting the macro plastic deformation of the cutting
edge.
Keywords: Plastic deformation, Sensors, Turning, Tool wear, Productivity increase, Surface roughness, Cutting force.
- Type of paper
: Paper in journal
Title: Solutions for Machinability
- Authors:
- Kuljanić, Elso (24585)
Journal: Meccanica
Number: 1
Volume: 14
Year: 1991
Pages: from 42 to 47
Number of references: 17
Language: talijanski
Summary: Quantitative machinability models which include a process
physics
description - Taylor's equation, new tool life equation etc. -are more
suitable and reliable than qualitative machinabilitymodels for advanced
machining systems, i.e. for unmannedmachining systems. The quantitative
machinability models couldbe used not only for optimization of machining
process, but todetermine the best tool and the given workpiece material
with thebest machinability.
Keywords: Machinability, Testing, Manufacturing systems, Materials, Tool life, CIM.
- Type of paper
: Paper in journal
Title: Characterization of Manufacturing Processes Based upon
Acoustic Emission Analysis by Neural Networks
- Authors:
- Grabec, I
- Kuljanić, Elso (24585)
Journal: Annals of the CIRP
Number: 1
ISSN: 3-905
Volume: 43
Year: 1994
Number of references: 7
Language: engleski
Summary: The article describes application of a Gaussian neural
network to monitoring of manufacturing processes. The network memory is
formed by a self-organized learning process which is stimulated by a
multicomponent input comprised of acoustic emission (AE) signals and
process parameters. By using a trained memory and a non-parametric,
multi-dimensional regression the process parameters are associatively
estimated from AE signals alone. In the article on-line estimation of
surface roughness in a grinding, and classification of tool sharpness in a
drilling process is described. Dynamical forecasting of AE signal in
drilling is also demonstrated.
Keywords: Manufacturing, Neural network, Acoustic.
- Type of paper
: Paper in journal
Title: Manufacturing Education in Some North-East Mediterranean
Countries - Proposals for Better Education
- Authors:
- Kuljanić, Elso (24585)
Journal: Compendium of International Models for Manufacturing
Education
Volume: 2
Year: 1995
Number of references: 1
Language: engleski
Summary: This paper deals with the present manufacturing education
in three countries: Croatia, Slovenia and Greece taken as a sample of the
north-east Mediterranean countries. Curricula, laboratories, industry
interaction, length of studies required for different degrees, and a
discussion of new faculty education are presented. How to make a competent
university professor is discussed and a research project is proposed. Also,
a system approach to manufacturing education and the requirement of the
acquaintance with the methodology of teaching for new faculty are proposed.
Keywords: Manufacturing, Models, Education.
- Type of paper
: Paper in proceedings
Title: A Contribution to Development of Tool Wear Estimation
Sensing Methods in Turning
- Authors:
- Mikac, Tonči (167792)
- Editors
- Kuljanić, Elso (24585)
Proceedings title: Advanced Manufacturing Systems and Technology Vol. II
Language: engleski
Place: Udine, Italia
Year: 1993
Pages: from 121 to 128
Meeting: 3rd International Conference on Advanced Manufacturing Systems and Technology
Held: from 04/26/93 to 04/27/93
Summary: With the development of automation tool monitoring is one
of thebasic elements of the performance of flexible manufacturingsystems.
In wiev of that fact, the worker's responsibility forcutting process
monitoring is replaced with different sensingtechniques for automatic
monitoring application. In the paper,survey of direct and indirect sensing
methods for tool wear andtool break estimation are shown. Tabulated list
comparasion ofdifferent sensing methods by establishing preferences and
defectsis given, in aim to establish a fact of reliability and economyof
method application. The paper also suggests one method fortool edge wear
sensing at turning process, based on the cuttingforces measurements by
strain-gage technique. Experimentalmeasurements have been carried out by
variation of workpiece andtool material. The method uses increase size of
cutting forcecomponents estimation depending on edge wear size, to
establishtool wear on the basis of initial cutting force, or to
establishcutting force limit in the moment of achieving the chosen
wearcriterion.
Keywords: Tool wear, Tool break, Sensors, Cutting forces.
- Type of paper
: Paper in proceedings
Title: An Automatic Tool Selection Module for CAPP Systems
- Authors:
- Mesquita, Ruy M.D.
- Cukor, Goran
- Editors
- Kuljanić, Elso (24585)
Proceedings title: Advanced Manufacturing Systems and Technology Vol. I
Language: engleski
Place: Udine, Italia
Year: 1993
Pages: from 155 to 165
Meeting: 3rd International Conference on Advanced Manufacturing Systems and Technology
Held: from 04/26/93 to 04/27/93
Summary: A modular approach to the introduction of CAPP functions
within aCAD/CAM environment is proposed. In this context, the developmentof
the automatic tool selection (ATS) module is presented,together with its
integration with the cutting conditionsoptimization module - MECCANO2. Tool
selection, combining theclassical procedure with the heuristic one, where
several rulesare applied through different levels, results in a very fast
andefficient algorithm. The procedure consists of a series ofscreenings
which represents checks for fulfilment ofcompatibility and suitability
requirements between machine tooland tool, and the elements of the part. In
the final phase, thecomparison of the selected tools with respect to the
economiccriteria is carried out using the data provided by theoptimization
module MECCANO2. The proposed interactive programsystem allows an accurate
assessment of the machining performanceof a tool with respect to the
economic criteria and supplies theminimum machining cost tool or set of
tools for the externalturning operations.
Keywords: Tool selection, Process planning, Turning, Machining optimization.
- Type of paper
: Paper in proceedings
Title: Machinability Testing for Advanced Manufacturing Systems
- Authors:
- Kuljanić, Elso (24585)
- Editors
- Kuljanić, Elso (24585)
Proceedings title: Advanced Manufacturing Systems and Technology Vol. I
Language: engleski
Place: Udine, Italia
Year: 1993
Pages: from 73 to 89
Meeting: 3rd International Conference on Advanced Manufacturing Systems and Technology
Held: from 04/26/93 to 04/27/93
Summary: The complete change in the science and technology
ofmanufacturing caused by the development and application ofcomputer
integrated advanced manufacturing systems, and newmaterials, brings about a
need to change the way of thinking andthe approaches in manufacturing
science. The same is valid forthe practice of manufacturing. In industrial
conditions, it isimportant that the machining system works, and in most
cases itdoes not matter how it works. The productivity of such amachining
system is usually much below its optimum value and themachining cost is too
high. Three significant factors causingsuch a situation are: a) an
inadequate approach to the machiningsystem, b) an obsolete way of thinking
under usually totally newconditions, and c) lack of reliable machinability
data andmachinability testing methods. This paper deals withmachinability
testing methods. A comparison of quick and longmachinability testing
methods is presented. The paper discussesISO International Standards Tool
Life Testing in Milling Part 1and 2, Tool Life Testing with Single Point
Turning Tools, VolvoMachinability Test, and brings out few remarks on the
documents.The usefulness of the chip forms - numeric coding system given
inthe ISO Standard and a need to use the coding system inmachinability
testing is pointed out. Since the existingstandards and methods have been
designed for steel and cast iron,it is proposed to work on machinability
testing methods for newmaterials with an emphasize on new composite
materials.
Keywords: Machinability, Testing, Manufacturing systems, Materials, Composite materials, Tool life, CIM, Chip control.
- Type of paper
: Paper in proceedings
Title: A Contribution to the Development of Automatic Tool
Selection Procedures
- Authors:
- Cukor, Goran (900106)
- Editors
- Franković, Bernard
Proceedings title: Zbornik Tehničkog fakulteta Sveučilišta u Rijeci
Language: hrvatski
Place: Rijeka
Year: 1993
ISBN/ISSN: 0353-281X
Pages: from 47 to 54
Summary: A procedure to select automatically the optimum tools for
the rough and finish external turning is proposed. The tools considered
herein consist of a holder and an indexable carbide insert. The cost of
machining with a given tool is estimated following the calculation of the
optimum cutting conditions consistent with the constraints acting on the
process. The proposed procedure allows assessment of the machining
performance of a tool with respect to the economic criteria and supplies
the minimum machining cost tool or set of tools for the external turnig.
Keywords: Tool selection, Turning, Tool definition parameters, Process planning, Machining optimization.
- Type of paper
: Paper in proceedings
Title: Determination of the Extended Tool Life Equation for
Quenched and Tempered Steel Machining
- Authors:
- Cukor, Goran
- Editors
- Franković, Bernard
Proceedings title: Zbornik Tehničkog fakulteta Sveučilišta u Rijeci
Language: hrvatski
Place: Rijeka
Year: 1994
ISBN/ISSN: 0353-281X
Pages: from 13 to 20
Summary: This paper investigates the machinability of quenched and
tempered steel 42 CrMo 4 (DIN). The wear of carbide tool at longitudinal
turning has been analyzed and to obtain statistically significant results
the random strategy method was applied. Experimental results were treated
with multiple linear regression analysis and confirmed with equation of
mathematical model, which shows dependency of tool life on cutting speed,
feed and depth of cut.
Keywords: The extended tool life equation, Quenched and tempered steel 42 CrMo 4 (DIN), Mathematical model, Multiple linear regression analysis, Turning.
- Type of paper
: M.A.
Title: Optimization of Machining Process
Faculty: Tehnički fakultet Sveučilište u Rijeci
Author: CUKOR GORAN
Date of defense: 03/06/95
Language: hrvatski
Number of pages: 98
Summary: The thesis investigates the optimization of turning. The
identification of the process is done by tool life equations. A new method
for cutting conditions optimization at turning process is proposed through
establishment of the functions both the objective and restriction, based on
which the interactive multi-criteria program system PIVOT was developed.
Finally, the wear of carbide tool at longitudinal turning has been analyzed
and to obtain statistically significant result the random strategy method
(RSM) was applied. Experimental results were treated with multiple linear
regression analysis and confirmed with equation of mathematical model which
shows dependency of tool life on cutting speed, feed and depth of cut.
Keywords: Multi-criteria optimization, Identification of machining process, Mathematical models, Tool life, Turning.
- Type of paper
: Mentorship
Title: Optimization of Machining Process
Faculty: Tehnički fakultet Sveučilište u Rijeci
Mentor: KULJANIĆ ELSO
Date of defense: 03/06/95
Number of pages: 98
Author: Cukor Goran
Degree level: M.A.
