Development and research of hydraulic drive of sheet shears

The paper describes the pump gear-multiplier drive of sheet shears with a two-cylinder power unit. The description of the developed drive scheme with the use of dual dispensers (reducer and multiplier) of periodic action is given. The gear is engaged at idle, the multiplier – at work. Their charging comes up at the reverse course of the power unit. Each dispenser has an input cylinder connected to the pump and two dosing (output) cylinders connected separately with the power cylinders of the power unit. In this case, the cylinder bodies form a fixed block, and the plungers (pistons) – a movable block. It solves the main task: synchronization of movement of the pistons (plungers) of the power cylinders during all operation periods. Due to different ratio of the area of pistons (plungers) of inlet (Fв ) and dosing cylinders (2Fд ), a direct stroke mode with two stages of pump speed and pressure is provided. For the reducer, ratio (Fв /(2Fд )) determines reduction coefficient (Kp < 1), for the multiplier – the coefficient of multiplication (Kм > 1). As a result, the idling speed of the pistons of the power cylinders and pressure developed by the pumps increase, and  during the working stroke – these values decrease. Working pressure of the pumps is equalized at a direct flow at a reduced level, which determines reduction of their installation power (up to 30 %). The analysis of graphs of power loading and speed was made. The condition of constant load at each of three main periods of the drive operation was accepted as: idle, working and reverse. Determinant parameters of the considered drive are the coefficients Kр (reduction), Kм (animation) and Kс – the gain of the power unit. The paper presents a comparative analysis of the considered and simple pump drive in order to establish the received combination and range of these values.

1. Stanovoi I.V., Kuz’menko L.N. Sistema upravleniya podvizhnoi traversoi gidravlicheskikh nozhnits [Control system of mobile cross-beam of hydraulic shears]. Certificate of authorship USSR no. 979033. Byulleten’ izobretenii. 1982, no. 45. (In Russ.).

2. Akers A., Gassman M., Smith R. Hydraulic Power System Analysis. New York: Taylor & Francis, 2006, 400 p.

3. Bhandari V.B. Design of Machine Elements. 3rd ed. Tata McGrawHill Education India Pvt. Ltd, 2012, pp. 768–796.

4. Bronin G.K., Viktorov V.K., Kazak V.V., Kononov I.V. Sistema upravleniya podvizhnoi traversoi gidravlicheskikh nozhnits [Control system of mobile cross-beam of hydraulic shears]. Certificate of authorship USSR no. 405670. Byulleten’ izobretenii. 1973, no. 45. (In Russ.).

5. Viktorov V.K. Sistema upravleniya podvizhnoi traversoi gidravlicheskikh nozhnits [Control system of mobile cross-beam of hydraulic shears]. Certificate of authorship USSR no. 902990. Byulleten’ izobretenii. 1982, no. 5. (In Russ.).

6. Yulin Wu, Shengcai Li, Shuhong Liu, Hua-Shu Dou, Zhongdong Qian. Vibration of Hydraulic Machinery. Springer, 2015, 500 p.

7. Bocharov Yu.A., Prokof’ev V.N. Gidroprivod kuznechno­pres­ sovykh mashin [Hydraulic drive of forging and pressing machines]. Moscow: Vysshaya shkola, 1969, 247 p. (In Russ.).

8. Singal R.K., Singal Mridual, Singal Rishi. Hydraulic Machines: Fluid Machinery. International Publishing House, 2009, 328 p.

9. Dobrinskii N.S. Gidravlicheskii privod pressov [Hydraulic drive of presses]. Moscow: Mashinostroenie, 1975, 222 p. (In Russ.).

10. Singh Sadhu. Fluid Machinery: Hydraulic Machines. Khanna Book Publishing, 2014.

11. Potapenkov A.P., Pilipenko S.S., Serebrennikov Yu.G., Stepanov S.M., Sosnovskaya L.V. Development and research of hydraulic gear-multiplier drive of metallurgical machines. Izvestiya. Ferrous Metallurgy. 2009, vol. 52, no. 8, pp. 54–59. (In Russ.).

12. Potapenkov A.P., Chabanenko V.I., Minyakov O.V., Goncharuk A.V. Gidravlicheskii press [Hydraulic Press]. Patent RF no. 2084348. Byulleten’ izobretenii. 1997. (In Russ.).

13. Potapenkov A.P., Pilipenko S.S., Stepanov S.M., Evdokina O.P., Korobtsova S.A. Designing and studying of a two-cylinder hydraulic drive of metallurgical machines. Izvestiya. Ferrous Metallurgy. 2011, vol. 54, no. 2, pp. 58–62. (In Russ.).

14. Potapenkov A.P., Chernobai V.M., Pilipenko S.S., Minyakov O.V., Nikonorov L.V. Gidravlicheskii press [Hydraulic press]. Patent RF no. 2258609. Byulleten’ izobretenii. 2005, no. 23. (In Russ.).

15. Modi P.N., Seth S.M. Hydraulics and Fluid Mechanics Including Hydraulics Machines. Rajasons Publications Pvt. Ltd., 2015, 406 p.

16. Fluid Mechanics and Hydraulic Machines. Rajput R.K. ed. NewDelhi, 2008, 1558 p.

17. Jathar Avinash, Kushwaha Avinash, Singh Utkarsh, Kumar Subhash. Fabrication and review of hydraulic heavy sheet metal cutting machine. Journal of Emerging Technologies and Innovative Research (JETIR). 2016, vol. 3, no. 4, pp. 37–41.

18. Krantikumar K., Saikiran K.V.S.S., Sathish Jakkoju. Pneumatic sheet metal cutting machine. International Journal and Magazine of Engineering, Technology, Management and Research. 2016, vol. 3, no. 3, pp. 501–509.

19. Artem’eva T.V., Lysenko A.M., Rumyantseva S.P., Stesin S.P. Gid­ ravlika, gidromashiny i gidroprivod [Hydraulics, hydraulic machines and hydraulic drives]. Stesin S.P. ed. Moscow: Akademiya, 2005, 336 p. (In Russ.).

20. Sermaraj M. Design and fabrication of pedal operator reciprocating water pump. International Journal of Engineering Research and Technology (IJERT). 2013, vol. 2, no. 1, pp. 1–5.