Study on Parameters Optimization of Ceramic Machining Process

2011 ◽  
Vol 418-420 ◽  
pp. 1338-1341
Author(s):  
Qiang Wang ◽  
Ying Ying Zeng ◽  
Xu Guang Min
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Cutting Speed ◽  
Tool Material ◽  
Parameters Optimization ◽  
Machining Process ◽  
Impact Factors ◽  
Surface Model ◽  
Optimal Parameters ◽  
Ceramic Machining

The response surface model is established through application of surface response method, then the main impact factors of ceramic machining are determined, and the process parameters are optimized. The mechanical machining technology of ceramic materials is analyzed, and the corresponding optimal parameters are proposed by cutting tool material, rake angle, clearance angle and edge angle, and three cutting elements as cutting speed, cutting depth and feed. Accord to the optimal parameters, high efficiency, good quality and low cost results can be achieved to machine ceramic parts.

The Application of New High-Strength Polyester Fiber Flexible Net for the End Coal Mining Through

2013 ◽  
Vol 750-752 ◽  
pp. 2141-2144
Author(s):  
Qi Tao Duan ◽  
Guo Yin Shang ◽  
Zhu He Xu ◽  
Xi Wen Zhang
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Cutting Speed ◽  
High Strength ◽  
Mining Area ◽  
Polyester Fiber ◽  
Construction Technology ◽  
Metal Mesh ◽  
Working Face ◽  
Mesh Material

Shendong mining area hanging nets adopted metal mesh material in the traditional through of fully mechanized coal face. Whose defects were the high cost of materials, process cumbersome, great labor intensity and time consuming. Therefore, new high-strength polyester fiber flexible mesh material was introduced. Its main advantages are: light weight, tensile resistance and drag force strong, flame-retardant and anti-static, low cost, simple process, high efficiency, coal cutting speed. The construction technology process in detail were designed which contained flexible network transported, fixed, dropped and raised. The project was implemented in Shigetai Coal at the end of No.12401 mining face. Results show that from working face mounting network to smoothly through with only 40 hours, compared with the traditional metal net can save 44 hours and cost 480000 yuan.

Influência do Avanço da Ferramenta e do Uso de Fluido de Corte na Rugosidade em Usinagem de Torneamento Cilíndrico Externo de Alumínio

2018 ◽  
Vol 13 (13) ◽  
pp. 13
Author(s):  
Clauber Roberto Melo Marques ◽  
Paulo Henrique Castagnel
Keyword(s):  
Mass Spectrometry ◽  
Cutting Speed ◽  
Tool Material ◽  
Chemical Characterization ◽  
Surface Characteristics ◽  
Cutting Parameters ◽  
Machining Process ◽  
Cutting Fluid ◽  
Dry Machining ◽  
Average Roughness

As características superficiais de uma peça usinada são resultantes de vários fatores, entre eles pode-se citar o material da ferramenta utilizada, geração de calor e parâmetros de corte. Este trabalho teve como objetivo principal verificar a influência do avanço da ferramenta e do uso de fluido de corte em usinagem analisando a rugosidade de superfícies de peças de alumínio usinadas por torneamento cilíndrico externo, em um equipamento CNC Romi Centur 30D com comando Siemens, variando-se a velocidade de avanço da ferramenta, assim como a usinagem a seco e com fluido de corte. Foi realizada uma análise da caracterização química por Espectrometria de Massa para identificar a constituição do material utilizado. Foi executado o processo de usinagem em 10 peças de alumínio, com velocidade de corte de 220 m/min em todos os testes, variando-se o avanço da ferramenta (0,1, 0,15, 0,2, 0,25, 0,30 mm/rot), e para cada valor de avanço diferente foi realizado um ensaio à seco e um com fluido de corte. Após a usinagem as peças foram analisadas utilizando-se um rugosímetro Mitutoyo modelo SJ-310, para medição da Rugosidade Média (Ra) resultante. Concluiu-se que para valores de avanço de ferramenta de até 0,25 mm/rot, com velocidade de corte de 220 m/min, a presença do fluido de corte na usinagem não apresentou melhoria no resultado final. Somente com avanço de 0,30 mm/rot a presença do fluido de corte se mostrou mais eficiente que a usinagem a seco.Palavras-chave: Usinagem. Alumínio. Rugosidade. AbstractThe surface characteristics of a machined part is the result of several factors, among them the tool material used, heat generation and cutting parameters. This work had as main objective the analysis of the surface roughness of aluminum parts machined by external cylindrical turning in a CNC Romi Centur 30D equipment with Siemens command, varying the speed of tool advance, as well as the dry machining and with cutting fluid. An analysis of the chemical characterization was performed by Mass Spectrometry to identify the constitution of the material used. The machining process was carried out in 10 pieces of aluminum, with a cutting speed of 220 m/min in all tests. The tool advance (0,1, 0,15, 0,2, 0,25, 0,30 mm/rot), and for each different feed rate a dry test and one with cutting fluid were performed. After machining, the parts were analyzed using a Mitutoyo model SJ-310 rugosimeter to measure the resulting Average Roughness (Ra). It was concluded that for tool feed values up to 0.25 mm/rot, with a cutting speed of 220 m/min, the presence of the cutting fluid in the machining did not show improvement in the final result. Only with an advance of 0.30 mm/rot the presence of the cutting fluid was more efficient than the dry machining. Keywords: Machining, Aluminum, Roughness.

scholarly journals Deformation Structures and Tool Wear during High-Speed Machining

2013 ◽  
Vol 10 (1) ◽  
pp. 12-17
Author(s):  
Karol Vasilko
Keyword(s):  
High Speed ◽  
Cutting Speed ◽  
Tool Material ◽  
Machining Process ◽  
Surface Dynamics ◽  
Machined Surface ◽  
Deformation Structures ◽  
Cutting Speeds ◽  
Tool Durability

Abstract Tendencies towards increasing cutting speeds during machining can be observed recently. The first wave of increasing cutting speeds occured in the 60s of the previous century. However, suitable tool material was not available at that time. Increasing cutting speed is possible only following the development of cutting material, resistant against high temperatures, abrasive, adhesive and diffusive wear. It is obvious that the process of chip creation, quality of machined surface, dynamics of machining process and temperature of cutting change considerably with cutting speed. To be able to apply higher cutting speeds in production machining, it is necessary to know the dependence of those characteristics on cutting speed. Some of those phenomena, which are linked with cutting speed, will be explained in the paper. Key words: machining, cutting speed, tool durability, surface quality

Magnetic Field Assisted Electrical Discharge Machining of AISI 4140

2014 ◽  
Vol 592-594 ◽  
pp. 479-483 ◽  
Author(s):  
Hemant Walkar ◽  
Vijaykumar S. Jatti ◽  
T.P. Singh
Keyword(s):  
Magnetic Field ◽  
Material Removal ◽  
High Efficiency ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Tool Material ◽  
Machining Process ◽  
Work Piece ◽  
Electrical Parameters ◽  
Machining Performance

Electric discharge machining (EDM) is a non-conventional machining process in which material removal take place by a series of electric spark generated between the small gap of both electrode and both immersed in dielectric medium. The gap conditions of EDM significntly affect the stability of machining process. Thus, the machining performance would be improved by removing the debris from the machining gap fastly. In view of this, the objective of present work was to investigate the effect of magnetic field on the material removal rate (MRR) and surface roughness (SR), in conjunction with the variation of electrical parameters like pulse on-off times and gap current, while keeping other electrical parameters and work piece/ tool material constant. Experimental results showed that the magnetic field assisted EDM improves the process stability. Moreover, the EDM process with high efficiency and quality of machined parts could fulfill the requirements of modern manufacturing industries.

NC Turning Process Parameters Optimization Based on Simulation Software

2012 ◽  
Vol 271-272 ◽  
pp. 452-456
Author(s):  
Shu Feng Sun ◽  
Ping Ping Wang ◽  
Xin Wu ◽  
Sen Lin
Keyword(s):  
Finite Element ◽  
Cutting Force ◽  
Process Parameters ◽  
Feed Rate ◽  
Cutting Speed ◽  
Simulation Software ◽  
Parameters Optimization ◽  
Machining Process ◽  
Optimum Process ◽  
Finite Element Software

Machining process parameters are main factors influencing machining quality and efficiency. Finite element models of tool and part are set up using finite element software Deform-3D. Variety laws of cutting force and temperature under different process parameters are simulated. The results are analyzed. Cutting force grows obviously with the growth of cutting speed (vc). However, cutting force fluctuates and decreases with the growth of cutting depth (ap) indicating the phenomenon of work hardening. Cutting force fluctuates and grows with the growth of feed rate ( f ). But the influence of feed rate ( f ) to cutting force is smaller than that of cutting speed (vc). The growths of the above mentioned three process parameters all cause the rise of temperature. Machining simulation research provides the optimum process parameters for CNC programming.

Machinability Investigation of Reaction-Bonded Silicon Carbide by Single-Point Diamond Turning

2008 ◽  
Vol 389-390 ◽  
pp. 151-156 ◽  
Author(s):  
Zhi Yu Zhang ◽  
Ji Wang Yan ◽  
Tsunemoto Kuriyagawa
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Large Scale ◽  
High Efficiency ◽  
Low Cost ◽  
Single Point ◽  
Diamond Turning ◽  
Machining Process ◽  
Depth Of Cut ◽  
Material Microstructure

Reaction-bonded silicon carbide (RB-SiC) is a recently developed ceramic material with many merits such as low manufacturing temperature, dense structure, high purity and low cost. In the present paper, the precision machinability of RB-SiC was studied by microindentation and single-point diamond turning (SPDT) tests. The influence of depth of cut and tool feed rate on surface roughness and cutting force was investigated. Results showed that there was no clear ductile-brittle transition in machining behavior. The material removal mechanism involves falling of the SiC grains and intergranular microfractures of the bonding silicon, which prevents from large-scale cleavage fractures. The minimum surface roughness depends on the initial material microstructure in terms of sizes of the SiC grains and micro pores. This work preliminarily indicates that SPDT can be used as a high-efficiency machining process for RB-SiC.

Tool Diffusion Wear Mechanism in High Efficiency Machining Ti6Al4V

2013 ◽  
Vol 579-580 ◽  
pp. 3-7
Author(s):  
Yi Hang Fan ◽  
Zhao Peng Hao ◽  
Min Li Zheng ◽  
Feng Lian Sun ◽  
Suo Liang Niu
Keyword(s):  
High Efficiency ◽  
Diffusion Mechanism ◽  
Cutting Temperature ◽  
Tool Material ◽  
Machining Process ◽  
Rake Face ◽  
Workpiece Material ◽  
Machined Surface ◽  
Diffusion Wear ◽  
Flank Face

Ti6Al4V has great affinity with tool material in machining process, which easily leads to tool diffusion wear. Turning experiments were carried out to study cutting temperature and pressure at tool-chip/workpiece. Based on the analysis, a scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometer (EDS) was used to analyze tool wear morphology. The affinity of tool and workpiece material using the Ti-W, Ti-Co diagram was also studied to elaborate the diffusion mechanism in this present study. The results shows that the cutting temperature is very high and the temperature increases with the increase of cutting speeds in machining Ti6Al4V. At the contact area, the highest temperature is located in tool rake face near to tool tip. The resilience of workpiece results in serious attrition between tool flank face and the machined surface. The highest pressure is located in tool flank face near to tool tip and the pressure in tool-workpiece interface is much higher than that in tool-chip interface. Under the high cutting temperature and high pressure at tool-chip/workpiece interface, diffusion occurred both at tool rake an flank face in machining Ti6Al4V. Because of the higher temperature at tool rake face diffusion at tool rake face ia more sever than that at tool flank face.

Influence of Micro Sandblasting on the Surface Integrity of the AlTiN Coated Tool Material

2021 ◽  
Author(s):  
Zhou Yu ◽  
Yujuan Dong ◽  
Guangming Zheng ◽  
Xiuli Jiang ◽  
Xiang Cheng ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Surface Integrity ◽  
High Efficiency ◽  
Low Cost ◽  
Tool Material ◽  
Maximum Velocity ◽  
Target Surface ◽  
Practical Significance ◽  
Coated Tools ◽  
Coated Tool

Abstract Due to the high-efficiency, environmental protection the low cost, the micro sandblasting technology is used in the surface treatment of the coated tools. The simulation and application of micro sandblasting of the coated tool are carried out to reveal the surface treatment mechanism and analyze the influence of sandblasting parameters on the tool surface integrity. The flow field erosion simulation model of abrasive-water-air three-phase flow is established. The results show that the maximum velocity and pressure are obtained at the center of jet flow. The pressure distribution on the target surface has little correlation with the distance to the nozzle. The surface morphology of the AlTiN coated tool changes obviously after micro sandblasting. Moreover, the low surface roughness Ra of the blasted tool can be obtained at the small sandblasting pressure and time. Additionally, the residual compressive stress on the surface of the AlTiN coated tool is enhanced after micro sandblasting. This work has practical significance for optimizing micro sandblasting process and improving the surface integrity of coated tools.

Thermo-Viscoplastic Modeling of Machining Process Using a Mixed Finite Element Method

1996 ◽  
Vol 118 (4) ◽  
pp. 470-482 ◽  
Author(s):  
Jung-Shu Wu ◽  
O. W. Dillon ◽  
Wei-Yang Lu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mixed Finite Element ◽  
Pure Titanium ◽  
Cutting Speed ◽  
Tool Material ◽  
Mixed Finite Element Method ◽  
Cutting Conditions ◽  
Machining Process ◽  
Element Method

This paper considers a thermo-viscoplastic model of the steady state orthogonal machining process by using a three-field mixed finite element method based on the Hu-Washizu variational principle. Assuming a trial chip geometry, work and tool material properties, and cutting conditions (cutting speed, feed rate and rake angle), detailed information on the state of the stresses, deformation, and temperature distributions in the workpiece and tool are obtained. This approach is shown to satisfy the nontrivial stress boundary condition better than the machining model that is based on the compatible displacement finite element method. The heat generated due to the plastic deformation, to the friction, and the heat conducted into the tool are calculated. The effects of the heat conduction and friction on the temperature field are studied. The isothermal machining case is also considered to study the thermal effect on the machining process. Numerical results are given for the aluminum 6061 alloy and pure titanium under several cutting conditions.

Analysis of Grinding Force Influence on HIPSN Ceramic Grinding Surface

2009 ◽  
Vol 416 ◽  
pp. 51-53
Author(s):  
Ke Zhang ◽  
He Wang ◽  
Yu Hou Wu ◽  
Song Hua Li
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Dynamic Performance ◽  
Grinding Force ◽  
Material Surface ◽  
Machining Quality ◽  
Ceramic Ring ◽  
Ceramic Machining

In ceramic machining field, the ultimate goal is to keep material surface integrity, dimension precision and max material removal rate synchronously. HIPSN ceramic ring high speed grinding experiments and researches have been performed, by testing and analyzing grinding force, combining grinding motorized spindle dynamic performance with grinding surface roughness, the influences on ceramic machining quality have been discussed. The grinding parameter can be chose in precondition promising machining quality. It possesses guidance significance in low cost, high efficiency precise ceramic parts machining.

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