Regenerative Chatter Vibration Occurring in Turning With Different Side Cutting Edge Angles

1995 ◽  
Vol 117 (4) ◽  
pp. 551-558 ◽  
Author(s):  
E. Marui ◽  
M. Hashimoto ◽  
S. Kato
Keyword(s):  
Energy Supply ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Edge ◽  
The Other ◽  
Chatter Vibration ◽  
Regenerative Chatter ◽  
Edge Angle ◽  
Regenerative Effect ◽  
Two Factors

This paper deals with the regenerative chatter vibration occurring in cutting tools with different side cutting edge angles. The occurrence of regenerative chatter vibration of the cutting tool is influenced by two factors, which are closely related to the vibratory energy supply or consumption. One factor is the interference effect between the tool flank and the workpiece. Of course, this factor exists in the primary chatter, too. The other is the regenerative effect. The influence of both factors on the regenerative chatter vibration of cutting tools with different side cutting edge angles is examined experimentally. The vibratory energy supply is simulated, considering the dynamic cutting process. As a result, the property of the regenerative chatter vibration and the influence of the side cutting edge angle on the regenerative chatter vibration are clarified.

Edge Design for Regrinding Cutting Tool

2011 ◽  
Vol 101-102 ◽  
pp. 938-941
Author(s):  
Xin Li Tian ◽  
Hao Wang ◽  
Xiu Jian Tang ◽  
Zhao Li ◽  
Ai Bing Yu
Keyword(s):  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Temperature ◽  
Cutting Edge ◽  
Edge Angle ◽  
Edge Radius ◽  
Tool Edge ◽  
Edge Defects ◽  
Tool Cutting ◽  
Edge Preparation

Regrinding of wasted cutting tools can recycle resources and decrease manufacturing costs. Influence of relative tool sharpness and tool cutting edge angle on tool edge radius were analyzed. Cutting force and cutting temperature were simulated with FEM on different edge radius. Edge preparation experiments were carried out though an abrasive nylon brushing method. The results show that RTS and cutting edge angle have influence on edge radius. Small edge radius might result in small cutting forces and lower average temperatures, could maintain the cutting state between tool and workpiece. The cutting edge defects can be eliminated through edge preparation, and a smooth cutting edge can be obtained. Cutting tool life will be improved through proper edge design and edge preparation.

Diamond Coatings for Machining: Coating Thickness Effects

2009 ◽  
Author(s):  
Feng Qin ◽  
Y. Kevin Chou ◽  
Dustin Nolen ◽  
Raymond G. Thompson
Keyword(s):  
Residual Stresses ◽  
Coating Thickness ◽  
Cutting Forces ◽  
Failure Modes ◽  
Cutting Tools ◽  
Cutting Edge ◽  
The Other ◽  
Diamond Coatings ◽  
Coated Tools ◽  
Other Hand

Chemical vapor deposition (CVD)-grown diamond films have found applications as a hard coating for cutting tools. Even though the use of conventional diamond coatings seems to be accepted in the cutting tool industry, selections of proper coating thickness for different machining operations have not been often studied. Coating thickness affects the characteristics of diamond coated cutting tools in different perspectives that may mutually impact the tool performance in machining in a complex way. In this study, coating thickness effects on the deposition residual stresses, particularly around a cutting edge, and on coating failure modes were numerically investigated. On the other hand, coating thickness effects on tool surface smoothness and cutting edge radii were experimentally investigated. In addition, machining Al matrix composites using diamond coated tools with varied coating thicknesses was conducted to evaluate the effects on cutting forces, part surface finish and tool wear. The results are summarized as follows. (1) Increasing coating thickness will increase the residual stresses at the coating-substrate interface. (2) On the other hand, increasing coating thickness will generally increase the resistance of coating cracking and delamination. (3) Thicker coatings will result in larger edge radii; however, the extent of the effect on cutting forces also depends upon the machining condition. (4) For the thickness range tested, the life of diamond coated tools increases with the coating thickness because of delay of delaminations.

Influence of Edge Preparation on Cutting Tool Wear

2012 ◽  
Vol 201-202 ◽  
pp. 1178-1181
Author(s):  
Guo Bing Chai ◽  
Wei Wang ◽  
Ai Bing Yu
Keyword(s):  
Tool Wear ◽  
Tool Life ◽  
Cutting Tool ◽  
Impact Resistance ◽  
Cutting Tools ◽  
Medium Carbon Steel ◽  
Cutting Edge ◽  
Cutting Tool Wear ◽  
Edge Radius ◽  
Edge Preparation

Edge preparation is not only the process of grinding proper geometry of cutting edge or removing micro-cracks on cutting edge region, but also a way of improving cutting tool life. In this study, cutting models with different cutting edge radius were set up with FEM software. Medium carbon steel cutting tests were carried out using cutting tools with different edge radius. Cutting tool wear was simulated and measured for comparison. The simulation results show that edge radius has influences on tool wear. Tool cutting behavior is concerned with edge radius. A proper edge radius will improve the tool life. The experimental results show that proper edge preparation could improve tool impact resistance capability and reduce tool wear. The cutting tool life can be prolonged with suitable edge preparation. Edge preparation can improve cutting performance of cutting tool.

Chatter Vibration of Lathe Tools. Part 2: On the Mechanism of Exciting Energy Supply

1983 ◽  
Vol 105 (2) ◽  
pp. 107-113 ◽  
Author(s):  
E. Marui ◽  
S. Ema ◽  
S. Kato
Keyword(s):  
Theoretical Result ◽  
Elastic Deformation ◽  
Energy Supply ◽  
Cutting Edge ◽  
Interference Model ◽  
Experimental Result ◽  
Chatter Vibration ◽  
Different Levels

First, the development of the chatter vibration is observed using several turning tools having various cutting edge configurations and in the conditions in which there are different levels of interference between the flank of the tool and the workpiece. Next, the exciting energy provided by the contact of tool flank and workpiece is calculated using an interference model at the tool flank which includes an elastic deformation of workpiece. This theoretical result agrees qualitatively with the experimental result concerning the development of chatter vibration. The energy-supplying mechanism in primary chatter vibration of a turning tool is clarified by examining the foregoing results collectively.

A New Method for Copper Spherical Surface Lathing with High Speed Steel Cutting Tool

2015 ◽  
Vol 667 ◽  
pp. 3-8
Author(s):  
Ze Fei Chen ◽  
Lang Zhang
Keyword(s):  
Surface Roughness ◽  
Cylindrical Surface ◽  
Cutting Tool ◽  
Spherical Surface ◽  
Cutting Edge ◽  
Good Effect ◽  
Cutting Depth ◽  
Edge Angle ◽  
Cutting Path ◽  
Cutting Point

On the basis of uneven copper surface roughness during lathering in common CNC lather, analyze the cutting ways of copper spherical surface and the cutting layer different from cylindrical surface lathing. The cutting direction of cylindrical surface lathing is constant, and its cutting layer is too. However, the direction of spherical surface lathing varies along the tangent of its cutting point continually, and the working cutting edge angle and the working minor cutting edge angle of the cutting tool vary too, so the theoretical surface roughness is affected. The cutting layer of spherical surface lathing varies continually, so does the cutting depth of its every cutting point. Through analysis and experiments, prove that cutting force variety is caused by the gradient variety of cutting depth, which leads to increase of the surface rough and its unevenness. Based on the research result, design some new cutting path to improve the surface roughness of copper spherical surface lathing, and obtain good effect.

A Numerical Study to Investigate the Influence of Edge Preparation in Vibration Assisted Machining

2018 ◽  
Author(s):  
Salman Pervaiz ◽  
Sathish Kannan ◽  
Wael Abdel Samad
Keyword(s):  
Cutting Forces ◽  
Small Amplitude ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Numerical Study ◽  
Cutting Tools ◽  
Cutting Edge ◽  
Internal Stresses ◽  
Machining Performance ◽  
Edge Preparation

In machining operation, cutting tool performs a central role towards the overall machining performance. A user from metal cutting community always look for better cutting tools that can enhance productivity by reducing tool wear and cost. Modification in the micro-geometry of cutting edge is termed as edge preparation, and it is performed to improve the machining performance by strengthening the cutting edge, reducing internal stresses of coating and lowering the edge chipping etc. Edge preparation has a controlling influence on the formation of deformation zones, cutting temperature, cutting forces and stresses at the cutting interface. Vibration assisted machining (VAM) concept is gaining fame in the metal cutting sector community for machining difficult-to-machine materials. In VAM, cutting tool moves with a small amplitude vibration instead of moving with a constant cutting velocity. This small amplitude vibrational movement provides better machining performance for difficult-to-cut brittle materials. The current numerical study utilized different edge prepared micro-geometries such as sharp edge, round edge and chamfer edge etc. cutting tools, and then these cutting tools were used in the numerical simulations of VAM. The study shows higher magnitude of cutting forces under VAM with tools with modified geometry. The study is beneficial for the metal cutting community and opens new areas of industrial applications.

Whirling Vibration in Drilling. Part 3: Vibration Analysis in Drilling Workpiece with a Pilot Hole

1988 ◽  
Vol 110 (4) ◽  
pp. 315-321 ◽  
Author(s):  
S. Ema ◽  
H. Fujii ◽  
E. Marui
Keyword(s):  
Frictional Force ◽  
Vibration Analysis ◽  
Cutting Edge ◽  
Chatter Vibration ◽  
Workpiece Surface ◽  
Pilot Hole ◽  
Regenerative Effect ◽  
Wave Forms ◽  
Vibration Wave ◽  
Flank Surface

The whirling vibration of the drill when beginning the drilling of a workpiece with a pilot hole, is theoretically examined. It becomes clear that the whirling is a regenerative chatter vibration which is caused by the regenerative effect at the major cutting edge and the frictional force occurring due to the interference between the flank surface of the major cutting edge and the workpiece surface. As the amplitude and the vibration speed of the drill are restricted by the characteristic of the frictional force, distinctive vibration wave forms are observed. It is also found that the frequency of the whirling vibration which is decreased by the frictional force, is considerably lower than the natural frequency of the system, and that the odd number polygon is produced by the regenerative effect.

On-Machine Measurement of Tool Cutting Edge Profiles

2009 ◽  
Vol 3 (4) ◽  
pp. 408-414 ◽  
Author(s):  
Takemi Asai ◽  
◽  
Sayeda Ferdous ◽  
Yoshikazu Arai ◽  
Yi Yang ◽  
...  
Keyword(s):  
Atomic Force Microscope ◽  
Cutting Tools ◽  
Cutting Edge ◽  
The Other ◽  
Measuring System ◽  
Diamond Cutting ◽  
Atomic Force ◽  
Diamond Cutting Tools ◽  
Tool Cutting

An on-machine profile measuring system for diamond cutting tools was constructed. It is based on the atomic force microscope (AFM). The characteristics evaluation experiment of the AFM unit was carried out. On-machine measurements of three tools, one having a straight cutting edge and the other two having round edges with nose radii of 0.2 mm and 0.1 mm, respectively, were conducted to demonstrate the applicability of this system.

Change Detection in Drilling Process Based on Temperature Nearby Cutting Edge by LSTM Neural Network

2020 ◽  
Author(s):  
Punnawit Metheenopanant ◽  
Haruhiko Suwa ◽  
Shogo Tokumura ◽  
Koji Murakami ◽  
Yoshiaki Nonaka
Keyword(s):  
Neural Network ◽  
Time Series ◽  
Change Detection ◽  
Cutting Tool ◽  
Time Series Data ◽  
Cutting Tools ◽  
Value Added ◽  
Cutting Edge ◽  
Series Data ◽  
Measuring Device

Abstract This study considers to efficiently collect “highly value-added” data for in-process anomaly detection of cutting tools in machining processes, and focuses on collection of time-series data of temperature nearby the tool cutting-edge by using a wireless tool holder system composed of an internal temperature measuring device and a wireless transmitter, which is connected with a thermocouple built-in the cutting tool. We then propose a method to detect a change of tool performance based on a recurrent neural network (RNN) with a long short-term memory (LSTM) structure. The capability of the proposed RNN system with LSTM is demonstrated through computational experiments, and demonstrate the time-series data of temperature nearby cutting tool tip is applicable for change detection of cutting tools status.

Tool Fracture at the End of a Cut—Part 1: Foot Formation

1988 ◽  
Vol 110 (4) ◽  
pp. 333-338 ◽  
Author(s):  
T. C. Ramaraj ◽  
S. Santhanam ◽  
M. C. Shaw
Keyword(s):  
Steady State ◽  
High Probability ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Companion Paper ◽  
The Other ◽  
Edge Chipping ◽  
High Speeds ◽  
Strong Material

Refractory metal cutting tools exhibit an unusually high probability of edge chipping and gross fracture when suddenly unloaded after cutting a strong material at high speeds and feeds. After identifying three possible mechanisms of brittle fracture when a cutting tool exits a cut, that associated with so-called “foot” formation is discussed in detail. This involves a sudden shift from steady state chip formation by concentrated shear to gross fracture of the workpiece as the end of the cut is approached. The other possible mechanisms are discussed in a companion paper to follow.

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