scholarly journals Spectral Properties of Milling and Machined Surface

2016 ◽  
Vol 836-837 ◽  
pp. 570-577 ◽  
Author(s):  
Gabor Stepan ◽  
Mate Toth ◽  
Daniel Bachrathy ◽  
Suri Ganeriwala
Keyword(s):  
Surface Quality ◽  
Spectral Properties ◽  
Cutting Tools ◽  
Milling Process ◽  
Machined Surface ◽  
Industrial Case Study ◽  
Machined Surface Quality ◽  
Negative Effect

Machine tool vibrations cause uncomfortable noise, may damage the edges of cutting tools or certain parts of machine tools, but most importantly, they always have negative effect on the quality of the machined surface of workpieces. These vibrations are especially intricate in case of milling processes where complex tool geometries are used, like helical, serrated, non-uniform pitch angles, and so on. During the milling process, the arising vibrations include free, forced, self-excited, and even parametrically forced vibrations together with their different combinations. Regarding surface quality, the most harmful is the self-excited one called chatter, which is related to the regenerative effect of the cutting process. Its relation to machined surface quality is demonstrated in an industrial case study. The modelling and the corresponding cutting stability are presented in case of a helical tool applied for milling with large axial immersions. The extremely rich spectrum of the measured vibration signals are analyzed by means of model-based predictions, and the results are compared with the spectral properties of the corresponding machined surfaces. The conclusions open the way for new kinds of chatter identification.

Vibration Analysis Based on AR Trispectrum in Milling Process

2010 ◽  
Vol 97-101 ◽  
pp. 1895-1901
Author(s):  
Yu Yan Jiang ◽  
Yi Jian Huang ◽  
Xiu Cheng Ye
Keyword(s):  
Surface Quality ◽  
Vibration Analysis ◽  
Metal Cutting ◽  
Cutting Parameters ◽  
Milling Process ◽  
Cutting Fluid ◽  
Depth Of Cut ◽  
Machined Surface ◽  
Machined Surface Quality

This paper presents the use of vibration analysis based on autoregressive (AR) trispectrum in milling process to indicate the relationship between machined surface quality of workpiece and spectrum character under a variety of different cutting parameter settings, such as the depth of cut, the feed rate and the spindle speed. The metal cutting experiments were performed on steel A3 material without using any cutting fluid. The experimental results for slices analysis of trispectra indicated that the spectral peaks were abundant as the milling process went smoothly. The roughness value measured reflects the machined surface quality of workpice. According to the changes for spectral peak and roughness value, a conclusion was made that the proposed trispectrum slices method for choosing cutting parameters and monitoring the machined surface quality in milling process was practicable.

scholarly journals 302 Evaluation of Machined Surface Quality of Long Fiber FRM by Electrical Discharge Machining

2000 ◽  
Vol 2000.53 (0) ◽  
pp. 49-50
Author(s):  
Rikio HIKIJI ◽  
Yoshihiro KAWANO ◽  
Koji ABURADA ◽  
Masakazu HARADA ◽  
Minoru ARAI
Keyword(s):  
Surface Quality ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Machined Surface ◽  
Machined Surface Quality

Influence of the CAM Parameters and Selection of End-Mill Cutter when Assessing the Resultant Surface Quality in 3D Milling

2014 ◽  
Vol 474 ◽  
pp. 267-272 ◽  
Author(s):  
Michal Fabian ◽  
Peter Ižol ◽  
Dagmar Draganovská ◽  
Miroslav Tomáš
Keyword(s):  
Ball Milling ◽  
Surface Quality ◽  
End Mill ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Different Types ◽  
Mill Cutter ◽  
Milling Tools ◽  
Selection Of

The paper deals with the effects of CAM data needed to produce desired quality of shaped surfaces in forming dies making. In general, the input CAM data have strong influence to the final surface quality. The shaped surfaces 3D milling has been modeled as end ball milling of the surfaces with defined inclination. The end ball milling is the most common way to finish shaped surfaces. Directions of the milling tools motion and applied cutting conditions have been used to simulate data when setting milling strategies. The resultant machined surface quality has been identified in terms of the surface roughness. The paper introduces recommendations applicable to the programming of the different types of milling strategy when producing form surfaces.

The Effects of Cutting Parameters on Surface Texture of Hybrid Composite CFRP/AL2024

2016 ◽  
Vol 863 ◽  
pp. 111-115 ◽  
Author(s):  
Saiful Bahri Mohamed ◽  
Wan Noor Fatihah Mohamad ◽  
Martini Muhamad ◽  
Jailani Ismail ◽  
Been Seok Yew ◽  
...  
Keyword(s):  
Surface Quality ◽  
Hybrid Composite ◽  
Cutting Parameters ◽  
Depth Of Cut ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Mechanical And Physical Properties ◽  
End Mills ◽  
Dry Conditions

The use of hybrid composite materials has increased due to their special mechanical and physical properties. However, machining of these materials is extremely difficult due to non-homogeneous, anisotropic and highly abrasive characteristics. The performance of machined surface quality of CFRP/Al2024 was described using two level factorial methodology. This research aims to study the interaction effects and significant factors of cutting parameters on the surface quality and optimise the cutting parameter for the surface quality of CFRP/Al2024 1μm to 2μm. The trimming process test was performed under dry conditions using burr tools 6mm diameter of end mills. The factors investigated were spindle speed (N), feed rate (fr) and depth of cut (dc), meanwhile profile roughness parameters (Ra) of CFRP and Al2024 were the response variables. Results show that the best estimated value of fr should be 500 mm/min to 530 mm/min, N is between and 2313.870 rpm to 2336.042 rpm. For both responses, N is the most significant effect followed by fr and dc.

The Effect of One Directional Ultrasonic Vibration Assistance in High Speed Meso-Scale Milling Process

2010 ◽  
Vol 447-448 ◽  
pp. 41-45 ◽  
Author(s):  
Jeong Hoon Ko ◽  
Kah Chuan Shaw ◽  
Han Kwang Chua ◽  
Rong Ming Lin
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
High Speed ◽  
Cutting Speed ◽  
Milling Process ◽  
Air Bearing ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Milled Surface ◽  
Vibration Assistance

One-directional ultrasonic vibration assisted milling system is designed and its performance is investigated in terms of machined surface quality under 135,000 rpm. The ultrasonic vibration generator excites the workpiece with a frequency around 40 kHz and amplitude of a few micro meters. The milling tool’s cutting speed is controlled by an air-bearing spindle system. Both feed-directional and cross-feed directional ultrasonic vibration assistance are considered in order to understand the mechanism of ultrasonic vibration assistance for surface roughness generation. A comparison is done on a milled surface which is generated with and without ultrasonic vibration assistance. The experimental results show that ultrasonic vibration assistance can improve the machined surface quality which depended on the cutting edge radius and the feed per tooth.

Research Progress of High Speed Cutting for SiCp_Al Composite Materials

2014 ◽  
Vol 800-801 ◽  
pp. 3-8
Author(s):  
Yang Bai ◽  
Pei Quan Guo ◽  
Ning Fan
Keyword(s):  
Composite Materials ◽  
Tool Wear ◽  
Surface Quality ◽  
High Speed ◽  
Surface Defects ◽  
Cutting Tools ◽  
Research Progress ◽  
Machined Surface ◽  
High Speed Cutting ◽  
Machined Surface Quality

Summarized the research and development of high speed machining of SiCp/Al composites. Emphasized the research status of high speed cutting of SiCp/Al composite materials, including machined surface quality and tool wear condition. Machined surface quality contains surface roughness and surface defects. The tool wear conditions are different because of different types of cutting tools, but the wear of the rake face, the rear face and the cutting edge are all involved.

Sign in / Sign up

Export Citation Format

Share Document