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RISS 인기검색어
- 검색키워드
- 저자 : Suhas S. Joshi (검색결과 4 건)
- 무료
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Investigations into Performance of Dry EDM Using Slotted Electrodes
Govindan Puthumana,Suhas S. Joshi 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
Dry EDM is an emerging EDM technology, which uses gas as dielectric fluid. Due to low density of gaseous dielectric, the process experiences i) unconstrained plasma expansion thereby reducing the effective material removal rate (MRR) and ii)inefficient disposal of debris. This work proposes use of electrodes with peripheral slots to provide more space for the flow of dielectric for effective debris disposal and consequently improve MRR. In this regard, a comprehensive experimentation using Taguchi L16 orthogonal array has been planned initially to optimize the number of peripheral slots on the electrodes,and then to understand the effect of the slots on material removal, tool wear, oversize and depth achieved as a function of processing conditions. It is observed that the optimum number of peripheral slots on electrode for effective debris evacuation is four for the electrode configuration used in this work. The statistical analysis shows that in dry EDM,discharge current (I), gap voltage (V), rotational speed (N) and pulse off-time (Toff) control MRR. Also, use of slotted electrodes significantly reduces the electrode wear rate, and attachment of debris particles on the electrodes.
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Analytical Modelling of Temperature in Cylindrical Grinding to Predict Grinding Burns
Azhar Thanedar,Ganesh G. Dongre,Suhas S. Joshi 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.1
The direct measurement of grinding temperature is always difficult due to coolant cover and very size of work and wheel interaction zone. At the same time, high heat generation in grinding often leads to grinding burns thereby affecting surface integrity; in this context, theoretical evaluation of temperature could facilitate early detection of the grinding burns. This paper therefore presents an analytical model to evaluate grinding temperature and correlates it with the occurrence of grinding burns in terms of BNA. In general, the analytical approach involves evaluating real contact length, grinding forces and finally grinding zone temperature for the plunge cylindrical grinding. The maximum rise in grinding temperature at the surface was calculated, for the wet grinding process by considering the total heat flux entering into the grinding system. Model validation experiments have been performed to measure BNA and identify parametric conditions that produce grinding burns. The model estimate of grinding zone temperature of 631 °C is in good agreement (92%) with other research works. Further, when the calculated grinding temperature reaches beyond 631 °C, the grinding burns are observed on the work surface with a BNA value of the order of 100 mp for the micro alloyed steel. The minimum thermal damage in terms of BNA is observed at higher levels of wheel speed and spark-out time and lower levels of depth of cut.
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Painless injections-a possibility with low level laser therapy
Jagtap, Bhagyashree,Bhate, Kalyani,Magoo, Surabhi,Santhoshkumar, S.N,Gajendragadkar, Kunal Suhas,Joshi, Sagar The Korean Dental Society of Anesthsiology 2019 Journal of Dental Anesthesia and Pain Medicine Vol.19 No.3
Background: Dental procedures commonly involve the injection of local anesthetic agents, which causes apprehension in patients. The objective of dental practice is to provide painless treatment to the patient. The purpose of this study was to evaluate the effect of Low Level Laser Therapy (LLLT) in reducing the pain due to local anesthetic injection. Materials and Methods: A prospective, split-mouth study was conducted on 25 patients. In Condition A, LLLT was administered followed by the administration of a standard local anesthetic agent. Patients' perception of pain with use of LLLT was assessed based on a Visual Analogue Scale (VAS). In Condition B, LLLT was directed to the mucosa but not activated, followed by the administration of local anesthesia. VAS was used to assess the pain level without the use of LLLT. Results: Comparison between Condition A and Condition B was done. A P value < 0.001 was considered significant, indicating a definite statistical difference between the two conditions. Conclusion: In our study, we observed that LLLT reduced pain during injection of local anesthesia. Further multi-centric studies with a larger sample size and various modifications in the study design are required.
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Avinash N. Khadtare,Raju Pawade,Suhas S. Joshi 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.3
Thermal barrier coated (TBC) superalloys are extensively used for manufacturing turbine blades to sustain high temperature zone while in operation. The production of cooling holes on these blades surface at various inclinations to the surface is essential to minimize the severe heat load experienced during working to achieve higher service life. Manufacturing of these holes is a main challenge in TBC superalloys due to combined metal and ceramic layers along the hole depth which effect on the thrust force generation, tool life and hole quality. Therefore, in this study mechanical micro-drilling is proposed to analyze the above highlighted difficulty. The experiments were performed on TBC Inconel 718 sheet having 3.3 mm thickness using 600 μm TiAlN coated carbide drill under dry environment. Three input parameters with their two levels are chosen for experimentations and each experiment is performed two times. Micro-drilling performance is assessed in terms of drilling thrust at different material layer with hole depth, taper of hole and distribution of thrust along the cutting edge of drill. Results show that magnitude of dynamic drilling thrust variation is observed at interface drilling irrespective of hole orientation. Whereas, maximum drilling thrust is observed before retraction of the drill. Magnitude of thrust force and fluctuation of thrust signal increases with depth of hole due to chip clogging in flute space. Minimum taper of a hole is observed in case of straight hole drilling than inclined hole whereas circular shape of hole is produced in straight hole drilling whereas elliptical hole is produced in case of inclined hole. Equal amount of thrust distribution along the cutting edge is observed in case of straight hole drilling but unequal amount of thrust distribution is seen in of case inclined hole due to drill-workpiece interaction.
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