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1

Milling tool deformation caused by heating during the cutting process

Moravek M., Burian D., Brajer J., Vyroubal J.

Journal of Machine Engineering

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2014

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Vol. 14, No. 2

81--92

EN

The presented paper describes an experiment dealing with the deformation of a milling tool caused by heating during the cutting process. Based on the literature review an experimental procedure is designed to simulate heating of the milling tool during machining. The experimental heating of the milling tool is realized using a laser beam. The frequency of laser radiation and the length of each pulse are selected in order to simulate the real cutting process. The output power of the laser radiation is 10W or 20W. During the experiment deformation and temperature of the tool are measured. In the second part of the presented article an experiment is carried out investigating the heating and deformation of the milling tool during real machining of an aluminium alloy. The experiment consists of several test cycles, when a different amount of material is removed. Deformations of the tool and also of the machine tool are measured immediately after milling, and during cooling to ambient temperature. The results clearly show that there is a significant temperature rise of the milling tool during the cutting process, which mainly causes milling tool extension in the axial direction. The conclusion of the experiment is that the thermal deformation of the milling tool during machining cannot be neglected, as it can also be a source of certain errors.

2

Monitoring and automatic supervision in manufacturing.

Szafarczyk Maciej

Advances in Manufacturing Science and Technology

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2001

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Vol. 25, nr 4

139-149

EN

Monitoring and automatic supervision are nowadays the main tasks of research in machine tool control systems. Two of the research projects carried out recently in the Division of Machine Tools and Manufacturing Systems are described in the article. They concern the monitoring of the natural wear of cutting edges in turning and the thermal distortions of machine tools.

PL

Zadaniem, które jest obecnie stawiane przed sterowaniem i krok po kroku realizowane, jest monitorowanie oraz automatyczny nadzór wytwarzania (w celu zabezpieczenia przed awariami i przestojami oraz zabezpieczenia przed produkcją braków), a także optymalizacja na bieżąco procesów wytwórczych. Praca przedstawia badania w Zakładzie Obrabiarek i systemów Wytwarzania nad monitorowaniem naturalnego zużycia ostrza (optymalne wykorzystanie narzędzi skrawających) oraz odkształceniami cieplnymi obrabiarek (dokładność obróbki).

3

Monitoring of thermal distortions using direct displacement measurement sensors

Ślązak Ł.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

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2000

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Vol. 76, nr 35

81-92

EN

It has been shown that machine tool thermal distortion can account for up to 70 per cent of the total machining error. As a result there has been a great deal of interest in techniques for minimising thermal errors influence on the accuracy of the workpiece. Usually the solutions based on the temperature measurement and neural networks are used for this purpose. However, due to the complexity of the thermal distortions' phenomenon, long time constant and the diversification of the machining cycles the mentioned solution is not fully satisfying. There is an urgent need for direct measurement of thermal distortions during operation of the machine tool. The paper presents the idea of simple direct measurement and displacement sensors that are used for monitoring of the NC lathe thermal distortions.