The Trial Research on Suppressing the Chatter by Variable Speed Milling

2011 ◽  
Vol 291-294 ◽  
pp. 2010-2013 ◽  
Author(s):  
Zhi Jian Gou
Keyword(s):  
Cutting Tool ◽  
Face Milling ◽  
Spindle Speed ◽  
Cutting Process ◽  
Variable Speed ◽  
Trajectory Parameter ◽  
Speed Variation ◽  
Cutting Chatter ◽  
Speed Parameter ◽  
Tool Cutting

The vibration occurring in cutting process is a very harmful phenomenon, which destroys the surface finish and dimensional integrity of workpieces and quickens the wear of cutting tool. Cutting chatter can be suppressed or reduced by applying the method of suppressing chatter by variable speed cutting. In order to investigate the effect of variable speed parameters and cutting conditions on suppressing the chatter in face milling, the tests have been conducted.The results have shown that cutting with variable spindle speed cutting in face milling will suppress the development of chatter. If chatter occurs in cutting process, the vibration amplitude of variable speed cutting can reduce by 3-6 times lower than that of constant speed cutting, as long as the variable speed parameter are selected suitably.The values of speed variation amplitude Δn/no and speed variation frequency fn of spindle speed trajectory parameter have great effect on suppressing chatter, Δn/no = 15- 20% and fn = 0.4 - 0.5Hz are suitable.

The Antivibration of Deeper Solt Milling System Experiment Research

2011 ◽  
Vol 121-126 ◽  
pp. 468-472
Author(s):  
Zhi Jian Gou
Keyword(s):  
Surface Finish ◽  
Cutting Tool ◽  
Spindle Speed ◽  
Variable Speed ◽  
Experiment Research ◽  
Trajectory Parameter ◽  
Slot Milling ◽  
Speed Variation ◽  
System Experiment ◽  
Cutting Vibration

The cutting vibration is a very harmful phenomenon, which destroys the surface finish and dimensional integrity of workpieces and quickens the wear of cutting tool. The cutting vibration can be suppressed or reduced by applying the variable spindle speed cutting. In order to investigate the effect of variable spindle speed parameters and cutting conditions on suppressing the vibration, the deeper slot milling tests have been conducted. The results have shown that the vibration occurring in deeper slot milling can be reduced by applying the method of variable spindle speed milling, as long as the variable speed parameters are elected suitably. The values of speed variation amplitude Δn/n0 and speed variation frequency fn of spindle speed trajectory parameter have a great effect on antivibration. Under this article test condition, the amplitude Δn/n0 of variable spindle speed is 20% and frequency fn of variable spindle speed is 0.3Hz.

Simulation and Experimental Research on Chatter Suppression Using Chaotic Spindle Speed Variation

2011 ◽  
Vol 133 (1) ◽  
Author(s):  
Kong Fansen ◽  
Liu Peng ◽  
Zhao Xingang
Keyword(s):  
Experimental Methods ◽  
Chaotic Signal ◽  
Spindle Speed ◽  
Speed Variation ◽  
Chatter Suppression ◽  
Spindle Speed Variation ◽  
Cutting Chatter ◽  
Chatter Control ◽  
Suppression Process ◽  
Chaotic Codes

A method for varying the spindle speed using chaotic signal to suppress chatter in machining is developed. The effects of spindle speed variation on cutting chatter control between using chaotic and sinusoidal signals were analyzed by simulation and experimental methods. Various chaotic codes are used in the chatter suppression process, and it is found that LORENZ-1 code results in the smallest machine noise.

An Investigation of Variable Spindle Speed Face Milling for Tool-Work Structures With Complex Dynamics, Part 2: Physical Explanation

1997 ◽  
Vol 119 (3) ◽  
pp. 273-280 ◽  
Author(s):  
R. Radulescu ◽  
S. G. Kapoor ◽  
R. E. DeVor
Keyword(s):  
Forced Vibration ◽  
Cutting Forces ◽  
Complex Dynamics ◽  
Spindle Speed ◽  
Constant Speed ◽  
Cutting Process ◽  
Variable Speed ◽  
Work System ◽  
Machining Operations ◽  
Work Done

Part 2 of this paper focuses on the explanation, both on theoretical grounds and through model simulations, of why the technique of variable spindle speed machining is an effective tool for increasing the quality and productivity of machining operations. In particular, Part 2 explains why, by disturbing the regenerative and forced vibration excitation frequencies which generate large amplitudes of vibration during constant speed machining, variable speed machining has the potential to reduce the vibration of the tool-work system and be robust with respect to the cutting process dynamics. The explanation is based on the work done by the cutting forces, the chip load variation, tool-work displacements, cutting forces, and workpiece surface error generated by both constant and variable speed machining. By investigating the effects of regeneration and forced vibration during variable speed machining on the vibration of tool-work systems having different cutter diameter-to-workpiece width ratios, it has been shown that variable speed machining is also robust with respect to the geometry of the tool-work system. This work concludes that variable speed machining is safer to use than constant speed machining when the effects of the tool-work dynamics and geometry on the vibration of the cutting process are hard to determine.

Stability and Online Monitoring of Cutting Chatter: A Review

2011 ◽  
Vol 121-126 ◽  
pp. 377-381
Author(s):  
Yong Liang Zhang ◽  
Zhi Yuan Li
Keyword(s):  
Machine Tool ◽  
Manufacturing Industry ◽  
Online Monitoring ◽  
Rapid Development ◽  
Stability Limit ◽  
Cutting Process ◽  
Work Piece ◽  
Cutting Chatter ◽  
The Stability ◽  
Tool Cutting

Cutting chatter is a kind of severe vibration generating from the interaction of machine tool system and cutting process and it will seriously affect the performance of machine tool and the quality of work piece. With the rapid development towards high precision and automation of the modern manufacturing industry, the stability and monitoring of cutting process have become the hot issues in production and engineering field, lots of useful researches and explorations have been done worldwide. The research situations of stability limit prediction of machine tool cutting system and technology of chatter online monitoring are discussed, the problems and the developing trends are summarized.

Dynamic model of cutting process with modulated spindle speed

2012 ◽  
Author(s):  
R. Rusinek ◽  
K. Kecik ◽  
J. Warminski ◽  
A. Weremczuk
Keyword(s):  
Dynamic Model ◽  
Spindle Speed ◽  
Cutting Process

DYNAMICS OF CUTTING TOOL TEMPERATURES DURING CUTTING PROCESS

1994 ◽  
Vol 7 (3) ◽  
pp. 203-216 ◽  
Author(s):  
Herchang Ay ◽  
Wen-Jet Yang ◽  
Juhchin A. Yang
Keyword(s):  
Cutting Tool ◽  
Cutting Process

Synthesis of Inertially Compensated Variable-Speed Cams

2003 ◽  
Vol 125 (3) ◽  
pp. 593-601 ◽  
Author(s):  
B. Demeulenaere ◽  
J. De Schutter
Keyword(s):  
High Speed ◽  
Design Procedure ◽  
Variable Speed ◽  
Speed Variation ◽  
Design Choice ◽  
Cam Follower ◽  
Speed Fluctuation ◽  
Novel Design

Traditionally, cam-follower systems are designed by assuming a constant camshaft speed. Nevertheless, all cam-follower systems, especially high-speed systems, exhibit some camshaft speed fluctuation (despite the presence of a flywheel) which causes the follower motions to be inaccurate. This paper therefore proposes a novel design procedure that explicitly takes into account the camshaft speed variation. The design procedure assumes that (i) the cam-follower system is conservative and (ii) all forces are inertial. The design procedure is based on a single design choice, i.e., the amount of camshaft speed variation, and yields (i) cams that compensate for the inertial dynamics for any period of motion and (ii) a camshaft flywheel whose (small) inertia is independent of the period of motion. A design example shows that the cams designed in this way offer the following advantages, even for non-conservative, non-purely inertial cam-follower systems: (i) more accurate camshaft motion despite a smaller flywheel, (ii) lower motor torques, (iii) more accurate follower motions, with fewer undesired harmonics, and (iv) a camshaft motion spectrum that is easily and robustly predictable.

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