Petr Blecha

Dr. Petr Blecha

orcid

Research Focus & Metrics

Academic Career Length

19Years (2008-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 January 2014 in Procedia Engineering
Verified
Journal Article
Open access
ZTZdenek Tůma
Zdenek Tůma
JTJiri Tůma
Jiri Tůma
RKRadek Knoflíček
Radek Knoflíček
PBPetr Blecha
Petr Blecha
FBFrantisek Bradáč
Frantisek Bradáč
Nowadays companies can solve production systems problems by variety of software solutions, but in practice it is known that it is often difficult to interpret these outputs, illustrate and to further integrate. One possibility is the use of augmented virtual reality for the planning of these systems. This article deals with the construction of the experimental sorting workplace as a model case of the production system. Weak points of solution are solved using augmented virtual reality, which helps to simulate the process in real time, in this case the virtual displayed product moving on belt conveyor before testing the real piece

8 September 2020 in Applied Sciences
Verified
Journal Article
Open access
PDF file
Michal HolubMichal Holub
Michal Holub
RJRóbert Jankových
Róbert Jankových
JVJan Vetiska
Jan Vetiska
JSJan Sramek
Jan Sramek
PBPetr Blecha
Petr Blecha
PHPetr Heinrich
Petr Heinrich
Currently, various types of software compensations are applied to machine tools. Their aim is to increase the working accuracy of the tools. The improvement in working accuracy is then further assessed according to the increase in the dimensional and shape accuracy or the surface quality of the workpiece. This publication describes the effects of the volumetric accuracy of a machine tool on the working accuracy of a workpiece, where total roundness (RONt) is evaluated in multiple cuts. In the experiment, two test workpieces are manufactured on a three-axis milling machining centre. The first is made using a standard machine setup while the second with activated volumetric compensation. The LaserTRACER self-tracking laser interferometer is used to compensate for volumetric accuracy. In the second part, verification measurements are performed with a Ballbar, where roundness error is evaluated according to ISO 230-4. Then two test workpieces are machined, and, in the last part, measurement is performed on Talyrond 595S roundness measuring equipment. Finally, the results are analysed and the dependence between the volumetric accuracy, the circularity error of the machine and the working accuracy of the CNC machine tool is established, represented by the RONt of the workpiece. This paper presents new and unpublished relations between the volumetric accuracy of the machine tool and the RONt of the workpiece.

20 May 2024 in Machines
Verified
Journal Article
Open access
PDF file
MSMatej Sarvaš
Matej Sarvaš
Michal HolubMichal Holub
Michal Holub
TMTomas Marek
Tomas Marek
JPJan Prochazka
Jan Prochazka
FBFrantišek Bradáč
František Bradáč
PBPetr Blecha
Petr Blecha
The operating conditions of the production process significantly influence the resulting dimensional and form accuracy of the workpiece. The operating conditions include the position of the workpiece location, with internal and external heat sources influenced not only by the machine location but also by its operation. In addition, there are the cutting conditions and the feed rate requirements of CNC machine tools. These changes, such as workpiece position, feed rates, and machine heat load, are further reflected in the ability of the machine to run at the position required and interpolate within the given tolerances of circularity. For the accuracy and repeatability of positioning, the machine was set up according to ISO 230-2 and for the circular interpolation tests according to ISO 230-4. The obtained results show the importance of attention to the appropriate setting of the operating conditions of the production process, where the knowledge of the geometric accuracy of the CNC machine tool in its working space can systematically increase the manufacturing accuracy itself or be another tool suitable for predicting the dimensional and form accuracy of workpieces.

14 December 2016 in MM Science Journal
Verified
Journal Article
Closed access
Michal HolubMichal Holub
Michal Holub
PBPetr Blecha
Petr Blecha
FBFrantisek Bradac
Frantisek Bradac
TMTomas Marek
Tomas Marek
ZZZdenek Zak
Zdenek Zak

10 September 2015 in MM Science Journal
Verified
Journal Article
Closed access
Michal HolubMichal Holub
Michal Holub
PBPetr Blecha
Petr Blecha
FBFrantisek Bradac
Frantisek Bradac
RKRoman Kana
Roman Kana

1 January 2011
Verified
Book Chapter
Closed access
PDF file
PBPetr Blecha
Petr Blecha
RBR. Blecha
R. Blecha
FBF. Bradáč
F. Bradáč