Videoblog

OPTIMIZATION OF VARIABLE PITCH MILLING CUTTERS

Cutting performance of standard helical milling cutters can be significantly increased by proper tuning of cutting edge geometry during the design. This video demonstrates how these analytically and numerically optimized tools increase the stability margins and the material removal rate for selected spindle speed regions.


This phenomenon was presented during CIRP HPC Conference at the Laboratory of Department of Applied Mechanics

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Attribution can be made by citing the following papers:

G. Stepan, D. Hajdu, A. Iglesias, D. Takacs, Z. Dombovari, Ultimate capability of variable pitch milling cutters, CIRP Annals 67(1), 373-376, 2018.

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Related publications:

G. Stepan, D. Hajdu, A. Iglesias, D. Takacs, Z. Dombovari, Ultimate capability of variable pitch milling cutters, CIRP Annals 67(1), 373-376, 2018.

CHATTER TEST WITH HIGH-SPEED CAMERA

In this video, we demonstrate the phenomenon of machine tool chatter using a flexure with a single dominant vibration mode. Milling test are carried out at six different spindle speeds. The video highlights three different scenarios: unstable (chatter), stable non-resonant (chatter-free) and stable resonant (chatter-free) cases in accordance with the predicted stability lobe diagrams.



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This media is licenced under CC BY-NC 2.0

You are free to
Share: copy and redistribute the material in any medium or format), and
Adapt: remix, transform, and build upon the material.
Under the following terms:
Attribution: You must give appropriate credit, provide a link to the license, and indicate if changes were made.
NonCommercial: You may not use the material for commercial purposes.


Attribution can be made by citing the following papers:

D. Hajdu, T. Insperger, D. Bachrathy, G. Stepan, Prediction of robust stability boundaries for milling operations with extended multi-frequency solution and structured singular values, Journal of Manufacturing Processes 30, 281–289, 2017.
J.Munoa, X.Beudaert, Z.Dombovari, Y.Altintas, E.Budak, C.Brecher, G.Stepan Chatter suppression techniques in metal cutting, CIRP Annals 65(2), 785-808, 2016.
S. Berezvai, D. Bachrathy, G. Stepan: High-speed camera measurements in the mechanical analysis of machining, 8th CIRP Conference on High Performance Cutting (HPC 2018), 2018.

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Related publications:

D. Hajdu, T. Insperger, D. Bachrathy, G. Stepan, Prediction of robust stability boundaries for milling operations with extended multi-frequency solution and structured singular values, Journal of Manufacturing Processes 30, 281–289, 2017.
J.Munoa, X.Beudaert, Z.Dombovari, Y.Altintas, E.Budak, C.Brecher, G.Stepan Chatter suppression techniques in metal cutting, CIRP Annals 65(2), 785-808, 2016.
S. Berezvai, D. Bachrathy, G. Stepan: High-speed camera measurements in the mechanical analysis of machining, 8th CIRP Conference on High Performance Cutting (HPC 2018), 2018.

CHIP FORMATION DURING ORTHOGONAL CUTTING

In this video, the chip formation process is presented for orthogonal planing test performed on a single aluminum rib with various chip thicknesses. The video presents the phenomena of chip segmentation and the effect of varying chip-thickness on the chip formation process.




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This media is licenced under CC BY-NC 2.0

You are free to
Share: copy and redistribute the material in any medium or format), and
Adapt: remix, transform, and build upon the material.
Under the following terms:
Attribution: You must give appropriate credit, provide a link to the license, and indicate if changes were made.
NonCommercial: You may not use the material for commercial purposes.


Attribution can be made by citing the following papers:

S. Berezvai, TG. Molnar, D. Bachrathy, G. Stepan: Experimental investigation of the shear angle variation during orthogonal cutting, Materials Today: Proceedings, 2018.
G. Gyebroszki, D. Bachrathy, G. Csernak, G. Stepan The stability of turning processes in case of periodic chip formation, Advances in Manufacturing, 2018.

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Related publications:

S. Berezvai, TG. Molnar, D. Bachrathy, G. Stepan: Experimental investigation of the shear angle variation during orthogonal cutting, Materials Today: Proceedings, 2018.
G. Gyebroszki, D. Bachrathy, G. Csernak, G. Stepan The stability of turning processes in case of periodic chip formation, Advances in Manufacturing, 2018.

BALL SHOOTER FOR MODAL TEST OF MAIN SPINDLE

In this video, we demonstrate a novel approach for impulse excitation of modal tests. The comparison of the commonly applied impulse hammer excitation method and the airsoft ball shooter method is presented with respect to the generated impulse. The video also highlights the automatic modal parameter identification of a rotating main spindle by means of the ball shooter.



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Downloading the video of Ball shooter for modal test of main spindle

This media is licenced under CC BY-NC 2.0

You are free to
Share: copy and redistribute the material in any medium or format), and
Adapt: remix, transform, and build upon the material.
Under the following terms:
Attribution: You must give appropriate credit, provide a link to the license, and indicate if changes were made.
NonCommercial: You may not use the material for commercial purposes.


Attribution can be made by citing the following papers:

D. Takacs, R. Wohlfart, A. Miklos, G. Krajnyak, A. Toth, G. Stepan: Ball shooting tests for identification of modal parameter variation in rotating main spindles, 8th CIRP Conference on High Performance Cutting (HPC 2018), 2018.
S. Berezvai, A. Kossa, D. Bachrathy, G. Stepan: Numerical and experimental investigation of the applicability of pellet impacts for impulse excitation, International Journal of Impact Engineering 115, 19-31, 2018.

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Related publications:

D. Takacs, R. Wohlfart, A. Miklos, G. Krajnyak, A. Toth, G. Stepan: Ball shooting tests for identification of modal parameter variation in rotating main spindles, 8th CIRP Conference on High Performance Cutting (HPC 2018), 2018.
S. Berezvai, A. Kossa, D. Bachrathy, G. Stepan: Numerical and experimental investigation of the applicability of pellet impacts for impulse excitation, International Journal of Impact Engineering 115, 19-31, 2018.