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Assessment of the safety of use of portable machine tools

Nowak M., Terelak-Tymczyna A.

Scientific Journal of the Military University of Land Forces

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2018

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Vol. 50, No. 3(189)

192--205

EN

The article presents safety issues related to on-site machining with the use of portable machine tools. Their advantage is the possibility of machining elements at places in which they are used. This especially refers to large-size constructions, welded elements and any items whose disassembly is technically difficult. The authors present tasks performed by the operators of portable machining equipment, working conditions, construction and characteristic features of portable machine tools on the example of a portable boring machine, milling machine and flange facing machine. The presented characteristics can influence the safety of work with these machines. The information given in the article were used to asses risk at the position of a portable machine tool operator. The assessment was conducted using the Risk Score method taking into account four stages of using portable machine tools, i.e. transport, assembly/disassembly, machining and maintenance. The result of the conducted risk analysis is the proposal of possible risk reducing actions. Due to the specificity of the operation of portable machine tools which significantly impedes the development of a machine tool which would be safe in and of itself, the proposed actions refer mainly to organisational solutions. The work presents also the thesis that it is possible to decrease the risk at this position thanks to the use of numerical control in a portable machine tool. Such a solution may reduce exposure to some identified threats. The issue is presented on the example of a prototype of a portable flange facing machine developed in the Institute of Mechanical Technology ZUT in Szczecin.

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Modeling mass-damper-spring systems in portable machine tools for flange machining

Pawełko P

Archives of Mechanical Technology and Automation

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2014

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Vol. 34, no. 1

13--23

EN

This article presents issues related to the modelling of flexible modular structures, namely mass-damper-spring systems in portable machine tools for flange machining. It presents a modification of regular design criteria used commonly for stationary machine tools which takes into the account the specificity of portable machines. The paper shows the importance of modelling of the clamping system connecting the portable machine and the workpiece, and the significance of modelling the workpiece itself, as the machine-clamp-workpiece-tool system - MCWT. In addition, FEM models of a portable machine tool are analyzed. Finally, the paper presents the interpretation of the obtained analytical results.

PL

W artykule opisano badania eksperymentalne mające na celu zbadanie wpływu orientacji na udarność wyrobów z ABS wytwarzanych techniką Fused Deposition Modeling. Próbki wytworzone przy różnych orientacjach poddano testowi udarności młotem Charpy'ego. Oprócz tego wytworzono metodą wtrysku próbki referencyjne z tego samego materiału ABS. Analiza wyników badań potwierdziła wstępne tezy oraz ważne obserwacje dotyczące wytrzymałości wyrobów kształtowanych techniką FDM.

3

A new approach to the mounting of a portable machine tool on a workpiece

Pawełko P., Nowak M., Szwengier G.

Archives of Mechanical Technology and Automation

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2013

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Vol. 33, no. 3

45--57

EN

This paper presents the problem of mounting portable machine tools on workpieces. It divides mounting methods with regard to the working space and the effect of a given mounting method on a workpiece. The paper also presents the concept of a portable mechatronic machine tool created at the Institute of Mechanical Engineering at the West Pomeranian University of Technology in Szczecin. Methodological basis is given for the correction of position errors between the machine tool and the workpiece.

PL

W artykule przedstawiono problematykę mocowania obrabiarek przenośnych na przedmiotach obrabianych. Dokonano klasyfikacji sposobów mocowania tychże maszyn ze względu na postać przestrzeni obróbkowej oraz wpływ wywierany przez sposób mocowania na przedmiot obrabiany. Zaprezentowano koncepcję mechatronicznej obrabiarki przenośnej, opracowaną w Instytucie Technologii Maszyn Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie. Omówiono podstawy metodyczne korygowania błędów położenia obrabiarki względem przedmiotu obrabianego.