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Tribological process of brush wearing

Ekinovic S., Zaimovic V.

Archives of Materials Science

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2008

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Vol. 29, nr 3

125-130

EN

The brushes are used for transmission of electric current from or to rotating surfaces depending on the type of electrical machines. Besides the process of current transmission, what is significant for the brushes is the tribological process, which is the subject of the experiment. The brush was exposed to a planned experiment and a regression and correlation analyses of tribological process of brush wearing relative to the time were undertaken. The interdependency has been tested and determined by regression analysis and by correlation analysis, the connection between the length of wearing Y of the examined brush and observing time X, taken in mode of statistics agglomerates. The wearing of brushes in practice varies relative to the time. The variations may result in extreme wearing of brushes, changes in the current transmission - arcing of brushes and the like.

2

Optimisation of the composing part of hand brake mechanism

Ekinovic S., Saric E.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 24, nr 1

208-211

EN

Purpose: The purpose of work is to show an example of 3D modeling and optimization combined with the design and production of prototype and experimental testing of a very important composing part of the mechanism for compensating the aeration in automobile hand brake. The basic notions about purpose, function, buyer's demands, specifics of the hand brake assemble construction are given. The proposal of concept for the development of the assembly, conceived by the buyer, is given as well. Design/methodology/approach: Very important task of the mechanism for compensating the aeration in automobile hand brake is to assure its function safety and a permanent grip angle of the hand brake. A new construction is made, which will satisfy the above mentioned demands, then the 3D technique is used to choose an optimal model, and, based on it, prototypes were produced and experimentally tested in real conditions. Findings: A new design of the elements of hand brake is developed. Research limitations/implications: The proposed methodology is repeatable for other similar mechanisms. Practical implications: Based on the research, new design of the mechanism of automobile hand brake is developed, by which the advancement of final product is enabled. Originality/value: : The demands of construction and mechanism functional safety are entirely satisfied.

3

An approach to determine transition area from conventional to high-speed machining by means of chip shape analysis

Ekinovic S., Begovic E.

Archives of Materials Science

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2007

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Vol. 28, nr 1-4

35-39

EN

High speed machining became a common machining solution for various machining applications. This fact is caused by many advantages that HSM can offer to manufacturers - good surface quality, shorter production cycles etc... Yet, the main problem producers faces here is increasing costs generated by high cutting tool price used in this application. This problem is common denominator most of the today high speed machining investigation. The paper shows an example of solving the problem by analyzing chip shape generated in this process in order to determine minimal cutting speed to be used in high speed area. In that sense it has been introduced new factor authors called "measure of segmentation", Ms, used to make clear distinction between conventional and high speed regions. Therefore, this cutting speed or cutting regime can contribute in increasing cutting tool life and improving economic benefits of HSM processes.