Abstract
A new hopefull technique, called high speed blanking, has been investigated since few years. To understand the cutting process and how the tools have to be designed, this study is interrested in the cutting force measurement. A new cutting force measure- ment device has to be designed consider the industrial interest of such a study. The de- signed test bench induces a calibration process in order to stucy the cutting forces evo- lution. The paper is discussing the result that the peack load seems to decrease when the punch speed increases. Finally microscopic observations are made in order to find Adia- batic Shear Bands.
Highlights
No fundamental innovation has been developed in the sheet metal blanking field [1]
Jana and al. showed that generally the amount of doming is reduced by using high punch speed [2]
First part corresponds to the middle of the specimen, where the punch is in contact, and the two other parts correspond to the contact between die and sheet metal
Summary
No fundamental innovation has been developed in the sheet metal blanking field [1]. A specific experimental device allowing cutting conditions control and thin observations has been developed This machine allows to measure strains during the cutting process through the use of gauges and KYOWA amplifier linked to an acquisition system LDS Nicollet. According to [1], the temperature increases in a very located area (around 10μm and in a very short time, less than 100μs), provocates adiabatic shearing bands This phenomena may reduce peak loading or energy needed to cut the sheet metal. Some material like steel C40 presenting a 51W.M−1.K−1 thermal conductivity should be a good candidate According to those remarks, this study is interested by obtaining the cutting evolution involved during the C40 steel cutting for differents punch speeds since 5 up to 20m/s. Some microscopic observations are done to understand if the evolution of cutting forces is related to the presence of adiabatic shearing bands
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