scholarly journals Influence of Tool Balancing in High Speed Machining

2014 ◽  
Vol 65 (1) ◽  
pp. 7-12
Author(s):  
Klaudia Bašovská ◽  
Jozef Peterka
Keyword(s):  
High Speed ◽  
Cutting Tools ◽  
Small Mass ◽  
High Speed Machining ◽  
Machined Surface ◽  
Tool Vibration ◽  
Mass Unbalance ◽  
Manufacturing Technologies ◽  
The Relationship

Abstract The high speed machining (HSM) is now considered as one of the key manufacturing technologies for higher throughput and productivity. HSM used higher rotational speed of the spindle (40,000 min-1 and higher). With increasing high speed spindle rotations raises a number of dynamic forces. Even a small mass unbalance in the spindle and tooling generates tool vibration. Tool vibration shortens tool life and lowers the quality of the machined surface. It is necessary to minimize this vibration by balancing tool and tool holder. The balancing process improves the mass distribution of a cutting tool and its holder, allowing the combination of the two to rotate with the minimum amount of unbalanced centrifugal forces. Machining with balanced tool will provide better surface quality, accuracy and less tool and machine wear. In this study is focused on unbalance cutting tools, definitions, balancing techniques, sources, effects, processes and machineries. The aim of this article was to examine the relationship between unbalance and tool holders used in high speed metalworking machine tools

Generation of NC Program for Realizing High Speed Feed Rate of Cutting Tool

2012 ◽  
Vol 523-524 ◽  
pp. 398-403
Author(s):  
Shintaro Sakurai ◽  
Hideki Aoyama ◽  
Noriaki Sano
Keyword(s):  
Feed Rate ◽  
High Speed ◽  
Cutting Tools ◽  
Sampling Time ◽  
Machined Surface ◽  
Nc Program ◽  
Circular Arcs ◽  
Offset Curves ◽  
Acceleration And Deceleration

As the feed rate of cutting tools is influenced by the quality of NC programs, this causes two problems when cutting freeform surfaces using NC machine tools, one is the feed rate does not reach the specified value, and the other is the quality of the machined surface decreases due to the large acceleration and deceleration of the control axes. One reason for these problems is that the method to generate cutter location data does not take into consideration the sampling time of the NC controller. To improve these problems, the approximation of offset curves with a series of circular arcs has generally been proposed. But conventionally, circular arc interpolation algorithms are complicated and not rational. So, in this study, we proposed two simple NC program generation methods. (1) Approximate the offset form with circular arcs based on the location of the center of curvature. (2) Make the distance between the cutter location points of the NC data an integral multiple of the “feed rate command F × sampling time T”. We also confirm the effectiveness of the proposed methods by simulations and experiments.

scholarly journals Study of Advanced Manufacturing Technologies for Active Parts of Injection Molds

2018 ◽  
Vol 8 (1) ◽  
pp. 89-94
Author(s):  
Noémi Rita Soós ◽  
Ödön János Soós
Keyword(s):  
Surface Quality ◽  
High Speed ◽  
Advanced Manufacturing ◽  
Injection Mold ◽  
High Speed Machining ◽  
Active Components ◽  
Advanced Manufacturing Technologies ◽  
Manufacturing Technologies

Abstract The main objective of this paper is to show the advantages of advanced manufacturing, such as high speed machining (HSM), for the active plates of injection molds. The goal of the experiment is to push the machine and the tools to the limit without reducing the surface quality of the manufactured part. The parts that are machined in this experiment are the active components of bucket injection mold. The mold core and nest is composed of several plates that have to form a whole when mounted together.

Study on Arithmetic of Surface Damage Ratio in High Speed Machining of Graphite Based on Matlab Image Processing

2013 ◽  
Vol 652-654 ◽  
pp. 2196-2199
Author(s):  
Li Zhou ◽  
Yu Zhong Li ◽  
Cheng Yong Wang
Keyword(s):  
Image Processing ◽  
Surface Quality ◽  
High Speed ◽  
Quantitative Description ◽  
Surface Damage ◽  
Projection Area ◽  
High Speed Machining ◽  
Machined Surface ◽  
Stereo Microscope

The surface quality of graphite cannot be completely evaluated only by the roughness value Ra measured by profilometer. The surface damage ratio Sc is presented to give quantitative description of surface quality of graphite, which was calculated as the ratio of the projection area of fracture craters to the overall area of free surface. The machined surface was observed and taken photo by use of the stereo microscope with CCD image acquisition system. Matlab image processing tool was used to convert the color photo to binary image, in which fracture craters were shown as black pixels and the other surfaces as white pixels. The surface damage ratio is the result of the sum of black pixels divided by the overall pixels. Under the same conditions of high speed machining experiments for verification, the surface damage ratio was calculated in comparison with the Ra values measured by profilometer. The variation tendency of surface damage ratios exhibited good coherence to the measured roughness.

Effects on Surface Integrity of Ti6Al4V in High Speed Milling

2017 ◽  
Vol 737 ◽  
pp. 156-161 ◽  
Author(s):  
Yong Feng Fang ◽  
Kong Fah Tee
Keyword(s):  
Surface Roughness ◽  
Surface Integrity ◽  
High Speed ◽  
Work Piece ◽  
Machined Surface ◽  
High Speed Milling ◽  
Edge Radius ◽  
Roughness Model ◽  
The Relationship

Surface topography is a significant factor that affects directly the surface integrity. There are several influencing factors. The purpose of the study is to investigate the effects of edge radius on surface integrity of Ti6Al4V. The proposed approach uses three different angles to study the relationship between the edge radius and surface roughness. The study develops theoretical model, roughness model based on cutting force and roughness empirical model. Experimental results show that machined surface integrity of TC4 is sensitive to the variations of the edge radius. The method is effective and can provide a guidance to optimize edge radius. It has realized higher accurate prediction of surface integrality in precision high speed milling with one of the models and has improved surface roughness quality of the work-piece.

Research on High-Speed Cutting of Cr12MoV Hardened Steel - A Review

2020 ◽  
Vol 15 ◽  
Author(s):  
Fei Sun ◽  
Guohe Li ◽  
Qi Zhang ◽  
Meng Liu
Keyword(s):  
High Speed ◽  
Cutting Temperature ◽  
High Hardness ◽  
High Strength ◽  
Hardened Steel ◽  
Parameters Optimization ◽  
Future Research ◽  
High Speed Machining ◽  
Machined Surface ◽  
Stamping Die

: Cr12MoV hardened steel is widely used in the manufacturing of stamping die because of its high strength, high hardness, and good wear resistance. As a kind of mainstream cutting technology, high-speed machining has been applied in the machining of Cr12MoV hardened steel. Based on the review of a large number of literature, the development of high-speed machining of Cr12MoV hardened steel was summarized, including the research status of the saw-tooth chip, cutting force, cutting temperature, tool wear, machined surface quality, and parameters optimization. The problems that exist in the current research were discussed and the directions of future research were pointed out. It can promote the development of high-speed machining of Cr12MoV hardened steel.

Evaluation and Improvement of Productivity in High-Speed NC Machining

1999 ◽  
Vol 122 (3) ◽  
pp. 556-561 ◽  
Author(s):  
X. Yan ◽  
K. Shirase ◽  
M. Hirao ◽  
T. Yasui
Keyword(s):  
High Speed ◽  
Nc Machining ◽  
Cutting Conditions ◽  
High Speed Machining ◽  
Machining Time ◽  
Time Constants ◽  
Nc Program ◽  
Kinematic Factor ◽  
Two Factors

The productivity of machining centers is influenced inherently by the quality of NC programs. To evaluate productivity, first an effective feedrate factor and a productivity evaluation factor are proposed. It has been found that in high-speed machining, these two factors depend on a kinematic factor which is a function of (1) command feedrate, (2) average per-block travel of the tool, (3) moving vectorial variation of the tool, and (4) ac/deceleration or time constants. Then an NC program simulator has been developed to evaluate productivity. With the simulator, the machining time can be calculated accurately and the cutting conditions can be extracted. Finally, three NC programs were implemented on high-speed machining centers and analyzed by the simulator. It was found that in mold and die machining, the productivity can be improved by increasing the acceleration and average travel and reducing the vectorial variation of the tool rather than the command feedrate. [S1087-1357(00)01303-4]

FEM Simulation of the Residual Stress in the Machined Surface Layer for High-Speed Machining

2006 ◽  
Vol 315-316 ◽  
pp. 140-144 ◽  
Author(s):  
Su Yu Wang ◽  
Xing Ai ◽  
Jun Zhao ◽  
Z.J. Lv
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Surface Layer ◽  
Residual Stresses ◽  
High Speed ◽  
Metal Cutting ◽  
Orthogonal Cutting ◽  
High Speed Machining ◽  
Machined Surface ◽  
Cutting Model

An orthogonal cutting model was presented to simulate high-speed machining (HSM) process based on metal cutting theory and finite element method (FEM). The residual stresses in the machined surface layer were obtained with various cutting speeds using finite element simulation. The variations of residual stresses in the cutting direction and beneath the workpiece surface were studied. It is shown that the thermal load produced at higher cutting speed is the primary factor affecting the residual stress in the machined surface layer.

Preliminary Experimental Study on Effect of Cutting Fluid on Milled Surface Quality of Iron-Base Superalloy

2014 ◽  
Vol 1077 ◽  
pp. 61-65
Author(s):  
Pei Yan ◽  
Xiang Su ◽  
Gang Wang ◽  
Yi Ming Rong
Keyword(s):  
Experimental Study ◽  
Surface Quality ◽  
High Speed ◽  
Cutting Fluid ◽  
Cutting Fluids ◽  
Machined Surface ◽  
Iron Base ◽  
Milled Surface ◽  
Base Superalloy

As the development of new materials and high speed machining, cutting fluid becomes more and more important because of its functions of cooling, lubrication, corrosion protection and cleaning. The main purposes of cutting fluid are decreasing temperature, reducing friction, extending tool life and improving machining efficiency. In precision machining, high machined surface integrity is the most important. In this paper, a preliminary experimental study on effect of two different cutting fluids on milled surface quality of iron-base superalloy was taken. The surface morphology, roughness, micro hardness and residual stress of the machined surface were investigated. The results showed that the material properties and geometric characteristics of the machined surface were significantly affected by cutting fluid conditions. The effect of cutting fluid on machined surface quality and service performance will become an important research direction. This paper also suggests the main contents of the further research on effect of cutting fluids on machined surface.

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