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RISS 인기검색어
- 검색키워드
- 저자 : Mohammadreza Shabgard (검색결과 3 건)
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Wire electrical discharge machining of ASP30 tool steel
Mohammadreza Shabgard,Ahad Gholipoor,Mohammad Hatami 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.8
Wire electrical discharge machining is a non-traditional cutting process for machining of hard and high strength materials. This study analyzed the effects of the main input parameters of wire electrical discharge machining of ASP30 steel (high alloyed Powder metallurgical [PM] high speed steel) as the workpiece on the material removal rate and surface roughness. The input parameters included spraying pressure and electric conductivity coefficient of the dielectric fluid, linear velocity of the wire and wire tension. The machined surface quality was evaluated using SEM pictures. Results indicated that increasing the spraying pressure of dielectric fluid leads to a higher material removal rate and surface roughness and that increasing the wire tension, linear velocity of wire, and electric conductivity of the dielectric fluid decreases the material removal rate and surface roughness.
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Mohammadreza Shabgard,Samad Nadimi Bavil Oliaei,Mirsadegh Seyedzavvar,Ahmad Najadebrahimi 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.12
An axisymmetric three-dimensional model for temperature distribution in the electrical discharge machining process has been developed using the finite element method to estimate the surface integrity characteristics of AISI H13 tool steel as workpiece. White layer thickness, depth of heat affected zone, and arithmetical mean roughness consisting of the studied surface integrity features on which the effect of process parameters, including pulse on-time and pulse current were investigated. Additionally, the experiments were carried out under the designed full factorial procedure to validate the numerical results. Both numerical and experimental results show that increasing the pulse on-time leads to a higher white layer thickness, depth of heat affected zone, and the surface roughness. On the other hand,an increase in the pulse current results in a slight decrease of the white layer thickness and depth of heat affected zone, but a coarser surface roughness. Generally, there is a good agreement between the experimental and the numerical results.
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Investigation of near dry EDM compared with wet and dry EDM processes
Ahad Gholipoor,Hamid Baseri,Mohammadreza Shabgard 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
Material removal rate (MRR), tool wear ratio (TWR) and surface roughness (SR) obtained by near-dry EDM process were comparedwith wet and dry EDM at three levels of discharge energy in drilling of SPK steel. Surface integrity machined by this process was studiedand compared with wet and dry EDM processes, by scanning electron microscopy (SEM). The results showed that at high level of dischargeenergy, wet EDM has the most MRR, TWR and SR, and dry EDM has the least MRR, TWR and SR, while at low dischargeenergy levels, near-dry EDM process has the most MRR and the least SR. SEM micrographs showed that the quality of surface obtainedby near-dry EDM process is better than others and the machined surfaces by near-dry EDM process have lower micro-cracks and craters,relatively.
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