Electric motor driven hydraulic clamping systems are commonly employed in Computer Numerically Control (CNC) machine tools for fixing work pieces on the machine table. The flow requirements for a typical hydraulic clamping system varies during machining of components, however, the existing electric motor drives operates at the constant speed and it leads to increased electrical power consumption. This paper presents an energy conservation strategy by retrofitting a variable frequency drive (VFD) in the motor drive of the hydraulic clamping system in a CNC machine for varying the speed of the motor at different load conditions and minimizing the power consumption of an electric motor. Flow characteristics and electric power consumption of proposed VFD based hydraulic pumping system was compared with the existing hydraulic pumping circuit and the results were presented. It was found that the proposed hydraulic pumping system operates at low follow rate after implementation of VFD and it consumes less power compared to existing hydraulic clamping system. © 2017 Elsevier Ltd.

Denis Ashok S

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Ramesh S

Nagaraj S.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Materials Today: Proceedings

In the Computer Numeric Control(CNC) machines, hydraulic clamping system is generally used to hold the work in the locating surface. This is because of the fact that hydraulic clamping system has greater efficiency as compared to the other clamping system and the power consumption is comparatively lesser. The hydraulic clamping system is driven by the hydraulic power pack. The existing hydraulic system is driven by the pump which operates at a constant speed. But during clamping application, the power required is less when it is in clamped position as compared to when the clamp is loaded and unloaded so there is room for reduction in the power consumption which can be achieved by varying the speed of the motor. This canbe achieved by introducing a Variable Frequency Drive (VFD). A percentage reduction of 80.65% was found by employing a Variable Frequency Drive. Thus, this paper is presented with a view to illustrate the conservation of energy for hydraulic clamping system with the introduction of Variable Frequency Drive. © Published under licence by IOP Publishing Ltd.

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IOP Conference Series: Materials Science and Engineering

Energy Efficient Hydraulic Clamping System using Variable Frequency Drive in a CNC Machine

At present, energy consumption is to such an extent that if the same trend goes on then in the future at some point of time, the energy sources will all be exploited. Energy conservation in a hydraulic power pack refers to the reduction in the energy consumed by the power pack. Many experiments have been conducted to reduce the energy consumption and one of those methods is by introducing a variable frequency drive. The main objective of the present work is to reduce the energy consumed by the hydraulic power pack using variable frequency drive. Variable Frequency drive is used to vary the speed of the motor by receiving electrical signals from the pressure switch which acts as the feedback system. Using this concept, the speed of the motor can be varied between the specified limits. In the present work, a basic hydraulic power pack and a variable frequency drive based hydraulic power pack were designed and compared both of them with the results obtained. The comparison was based on the power consumed, rise in temperature, noise levels, and flow of oil through pressure relief valve, total oil flow during loading cycle. By comparing both the circuits, it is found that for the proposed system, consumption of power reduces by 78.4% and is as powerful as the present system. © Published under licence by IOP Publishing Ltd.

Energy conservation strategy in Hydraulic Power Packs using Variable Frequency Drive IOP Conference Series: Materials Science and Engineering

Increasing cost and power demand, leads to evaluation of new method to increase through productivity and help to solve the power demands. Many researchers have break through to increase the efficiency of a hydraulic power pack, one of the promising methods is the concept of regenerative. The objective of this research work is to increase the efficiency of a hydraulic circuit by introducing a concept of regenerative circuit. A Regenerative circuit is a system that is used to speed up the extension stroke of the double acting single rod hydraulic cylinder. The output is connected to the input in the directional control value. By this concept, increase in velocity of the piston and decrease the cycle time. For the research, a basic hydraulic circuit and a regenerative circuit are designated and compared both with their results. The analysis was based on their time taken for extension and retraction of the piston. From the detailed analysis of both the hydraulic circuits, it is found that the efficiency by introducing hydraulic regenerative circuit increased by is 5.3%. The obtained results conclude that, implementing hydraulic regenerative circuit in a hydraulic power pack decreases power consumption, reduces cycle time and increases productivity in a longer run. © Published under licence by IOP Publishing Ltd.

Design of An Energy Efficient Hydraulic Regenerative circuit

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An Energy Conservation Strategy Using Variable Frequency Drive for a Hydraulic Clamping System in a CNC Machine

Journal	Data powered by TypesetMaterials Today: Proceedings
Publisher	Data powered by TypesetElsevier BV
ISSN	2214-7853
Open Access	0