Development of a novel boring tool with anisotropic dynamic stiffness to avoid chatter vibration in cutting

2021 ◽  
Vol 68 ◽  
pp. 57-71 ◽  
Author(s):  
Wataru Takahashi ◽  
Norikazu Suzuki ◽  
Eiji Shamoto
Keyword(s):  
Dynamic Stiffness ◽  
Chatter Vibration ◽  
Boring Tool

scholarly journals Critical Thickness and Dynamic Stiffness for Chatter Avoidance in Thin Floors Milling

2011 ◽  
Vol 188 ◽  
pp. 116-121 ◽  
Author(s):  
Francisco Javier Campa ◽  
Luis Norberto López de Lacalle ◽  
Gorka Urbicain ◽  
Aitzol Lamikiz ◽  
Sébastien Seguy ◽  
...  
Keyword(s):  
Critical Thickness ◽  
Dynamic Stiffness ◽  
Experimental Tests ◽  
Chatter Vibration ◽  
End Mill ◽  
Thin Walls ◽  
Stability Model ◽  
Aeronautical Industry ◽  
The Stability ◽  
Model Algorithm

A common problem in the aeronautical industry is the chatter vibration due to the lack of dynamic stiffness in the milling of thin walls and thin floors. The present work proposes a method for chatter avoidance in the milling of flexible thin floors with a bull nose end mill. It allows the calculation of the thickness previous to finish milling or the minimum dynamic stiffness that the floor must have to avoid the chatter vibration appearance. To obtain these values, the stability model algorithm has been inverted to estimate the thickness or the dynamic stiffness required in a floor to allow a stable milling. This methodology has been validated satisfactorily in several experimental tests.

Monitoring Method of Process Temperature and Vibration of Rotating Machining Tool with a Wireless Communication Holder System

2016 ◽  
Vol 874 ◽  
pp. 519-524 ◽  
Author(s):  
Ryo Matsuda ◽  
Masatoshi Shindou ◽  
Tatsuya Furuki ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama
Keyword(s):  
Wireless Communication ◽  
Infrared Thermography ◽  
Process Monitoring ◽  
End Milling ◽  
Process Temperature ◽  
Chatter Vibration ◽  
End Mill ◽  
Monitoring Method ◽  
Mems Accelerometer ◽  
Boring Tool

We developed a wireless communication holder system to monitor the process temperature and vibration of a rotating machining tool. This report presents an estimation of the process temperature in end-milling and the chatter vibration when boring with it. The thermocouple is set in the end-mill tool to measure the process temperature, and the MEMS accelerometer is set in the boring tool to measure the chatter vibration. We also present an investigation of the end-mill temperature observed using infrared thermography and the vibration of the spindle using a traditional accelerometer. The proposed holder system was found to be effective to estimate the process monitoring of the rotating machining tools.

A New Mechanism Explaining High Frequency Chatter Vibration Involving Tool Tip X-Y Looping in Fine Boring

2000 ◽  
Author(s):  
Evita Edhi ◽  
Tetsutaro Hoshi
Keyword(s):  
High Frequency ◽  
Computational Analysis ◽  
Small Diameter ◽  
Chatter Vibration ◽  
High Frequencies ◽  
Hardened Alloy ◽  
Engine Component ◽  
Boring Tool ◽  
Fine Boring ◽  
Motorcycle Engine

Abstract The study deals with boring tool, which was found to exhibit chatter in fine boring operation occurring at high frequencies, more than 10,000 Hz, and causing reduced tool life. The boring tool was operated in a stage of a transfer-type machining equipment and used for making small diameter hole, 15mm (0.59in), in a hardened alloy steel of motorcycle engine component. The objective of the research is to identify the mechanism responsible for the onset of the high frequency chatter. To study the mechanism, cutting tests have been performed in analogous machining operation, as well as structural dynamics examination of boring tool using experimental modal analysis by sinusoidal excitation. The experimental study has revealed that the traditional knowledge of regenerative chatter can not fully explain the chatter mechanism, but the effect of regeneration, the imaginary part effect of inner modulation, and the X-Y looping of the tool tip are three relevant characteristics in the onset of the chatter. Those findings are included in a new theoretical chatter model of which validity is evaluated principally by computational analysis of energy supplied and dissipated in the cutting process-boring tool structure system per vibration cycle.

A New Mechanism Explaining High Frequency Chatter Vibration Involving Tool Tip X-Y Looping in Fine Boring

2000 ◽  
Vol 123 (3) ◽  
pp. 370-376 ◽  
Author(s):  
Evita Edhi ◽  
Tetsutaro Hoshi
Keyword(s):  
Experimental Study ◽  
Tool Life ◽  
Structural Dynamics ◽  
High Frequency ◽  
Computational Analysis ◽  
Chatter Vibration ◽  
Penetration Effect ◽  
Regenerative Effect ◽  
Boring Tool ◽  
Fine Boring

Chatter occurring at more than 10,000 Hz frequency was found in fine boring operation, and causing reduced tool life. To identify the mechanism for the onset of high frequency chatter, cutting tests and structural dynamics examination of the boring tool have been performed. Experimental study has revealed that the regenerative effect, the penetration effect, and the X-Y looping of the tool tip are three relevant characteristics in the onset of the chatter. Those findings are included in a new chatter model of which validity is evaluated by computational analysis of energy supplied and dissipated in the vibrating system.

Repeatability vs. multiple-trait models to evaluate shell dynamic stiffness for layer chickens

2017 ◽  
Vol 95 (1) ◽  
pp. 9 ◽  
Author(s):  
A. Wolc ◽  
J. Arango ◽  
P. Settar ◽  
N. P. O’Sullivan ◽  
J. C. M. Dekkers
Keyword(s):  
Dynamic Stiffness ◽  
Multiple Trait ◽  
Layer Chickens

Boring Tool Permitting Scratch-Free Removal

2020 ◽  
Vol 40 (8) ◽  
pp. 681-682
Author(s):  
G. S. Zheleznov ◽  
A. V. Shirokov
Keyword(s):  
Boring Tool

Exact solution by dynamic stiffness method for the natural vibration of porous functionally graded plate considering neutral surface

2021 ◽  
pp. 146442072098817
Author(s):  
Md. Imran Ali ◽  
Mohammad Sikandar Azam
Keyword(s):  
Power Law ◽  
Functionally Graded Material ◽  
Stiffness Matrix ◽  
Natural Vibration ◽  
Dynamic Stiffness ◽  
Functionally Graded ◽  
Neutral Surface ◽  
Functionally Graded Plate ◽  
Dynamic Stiffness Matrix ◽  
Graded Material

This paper presents the formulation of dynamic stiffness matrix for the natural vibration analysis of porous power-law functionally graded Levy-type plate. In the process of formulating the dynamic stiffness matrix, Kirchhoff-Love plate theory in tandem with the notion of neutral surface has been taken on board. The developed dynamic stiffness matrix, a transcendental function of frequency, has been solved through the Wittrick–Williams algorithm. Hamilton’s principle is used to obtain the equation of motion and associated natural boundary conditions of porous power-law functionally graded plate. The variation across the thickness of the functionally graded plate’s material properties follows the power-law function. During the fabrication process, the microvoids and pores develop in functionally graded material plates. Three types of porosity distributions are considered in this article: even, uneven, and logarithmic. The eigenvalues computed by the dynamic stiffness matrix using Wittrick–Williams algorithm for isotropic, power-law functionally graded, and porous power-law functionally graded plate are juxtaposed with previously referred results, and good agreement is found. The significance of various parameters of plate vis-à-vis aspect ratio ( L/b), boundary conditions, volume fraction index ( p), porosity parameter ( e), and porosity distribution on the eigenvalues of the porous power-law functionally graded plate is examined. The effect of material density ratio and Young’s modulus ratio on the natural vibration of porous power-law functionally graded plate is also explained in this article. The results also prove that the method provided in the present work is highly accurate and computationally efficient and could be confidently used as a reference for further study of porous functionally graded material plate.

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