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SERVO DRIVE PRESS TECHNOLOGY
Guided by:Assistant Professor R.I.E.T., Trivandrum
Presented by:Gokul SasidharR.I.E.T., Trivandrum
Introduction
•Forming press/ Press: Machine tool that changes the shape of workpiece by the application of pressure.
•Classification: hydraulic, mechanical, pneumatic
•Press types: straight side, BG(back geared), geared, gap, OBI(open back inclinable) and OBS(open back stationary).
Introduction (Cont…) • Most common types: gap frame/ C-frame and straightside press
• C-frame: easy access to the die area on three sides
• Straight side press: vertical coloumns on either side of machine, eliminates angular deflection.
• Servo press: press driven by an AC servo motor.
• Low energy consumption than others.
Existing technology
• Hydraulic press- derive the energy which deliver through hydraulic pressure.
• Relatively slower- longer contact with the work, cooling is an issue.
Existing technology (cont…)• Powerful class of press, large as buildings, which deliver awesome
pressure.
• Largest hydraulic press- applying 75,000 tons of force.
• Large capacities at lower cost etc…
• Requires external power to feed stock.
Existing technology (cont…)• Mechanical press- transforms the rotational force into a translational force
vector.
• Faster than hydraulic press.
• Use- metal forging manufacture and sheet metal working.
• Largest mechanical press- 12,000 tons of force.
Servo mechanism
• Servo mechanism/servo- uses error-sensing negative feedback to correct performance of a mechanism.
• Principle- negative feedback, control input is compared to the actual position of the mechanical system.
• Any difference between the actual and wanted value is amplified and direct the system to eliminate the error.
• Application: automatic machine tools, satellite-tracking antennas, remote control airplanes etc…
Servo press
• Press which uses servo motor for controlling the functions.
• Important parts- Slide, Bolster, Ball screw, Strain gauge, Servo motor.
• Blanking load- load between the slide and the bolster.
• Blanking time- time from contact of punch with material to the breakage of material.
Working principle
Working principle(cont…)• Output of sound level meter and displacement meter recorded using digital
oscillograph.
Applications• Coining
• Blanking
• Stamping
• Ironing
Advantages
• Energy consumption is comparatively less
• Local slide movement for high productivity.
• Improvement of dimensional accuracy.
• Digital linkage with other machines.
Disadvantages
• The power cannot be blocked.
• As the servo motor is expensive, the servo press is also more expensive.
• Requires skilled labour.
Future scope• The combination of various manufacturing processes can be made possible
by integrating the servo presses.
• The number of driving axes of each servo press can be increased.
• Computer simulation for complicated slide motion of servo presses.
• Slide motions can be achieved irrespective of the location of production.
Conclusion
• Future of production process.
• Varying the velocity and motion of slide stroke.
• Allows forming of complex parts in one press.
• Increasing the productivity and saving time.
Reference
• Priya Vhangade, D.S.S. Sudhakar, Rajeev Solanki, Study of servo drive press technology- A review, IJIRSET, Vol. 5, Issue 4, (2016)
• Tomohiro Murakami, Ming Yang, Hiroshi Kishi, Sigeki Mori, Masahiro Ohkawa, Influence of blanking vibration using screw drive servo press, JSME, Vol. 3, Issue 2, (2016)
• http://www.greenerd.com/hydraulic-press-productivity-guide/default.aspx
• https://en.wikipedia.org/wiki/Servo_drive
• https://en.wikipedia.org/wiki/Machine_press
Questions?