International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
DESIGN OF GENEVA WHEEL BASED AUTO-ROLL PUNCHING MACHINE R. Syam Sudhakar Rao1, A. Hari Tej2, C. Siva Sai3, A. Rupesh Kumar4, A. Narayana Reddy5, B. Sai Krishna6 [1]Professor,
Dept. of Mechanical Engineering, S.V.C.E.T Chittoor, Andhra Pradesh, India. Dept. of Mechanical Engineering, S.V.C.E.T Chittoor, Andhra Pradesh, India
[2][3][4][5][6]Students,
---------------------------------------------------------------------***--------------------------------------------------------------------1.1 Methodology [2]
Abstract - On the conventional punching machine the time
for job setting, marking, punching operation is more. Labor cost is also more. With Geneva based punching machine the time for job setting, marking, punching, labor cost decreases and also less maintenance cost. In this project we are designing and fabricating the prototype of Auto roll punching machine using Geneva mechanism. This project is specially designed for automatic punching in metal sheet. This project is to introduce automation in industries. The major components involved in this project are dc motor, cam arrangement, chain drive, Geneva mechanism and punching tool. In this project we are using two rollers for moving the sheet during operation. A dc motor is connected with cam. The cam has a pin which rotates the Geneva wheel. The Geneva wheel is attached to the chain drive. The other end of the chain drive is connected to the rollers which roll the metal sheet and the punching operation is done by the punch tool. It is suitable for making mass production of the sheet metal punching.
This project is designed with using Geneva mechanism moving arrangement and punching mechanism. Punching machine is designed with mechanical arrangement in which movements are controlled by using Geneva mechanism. Auto roll punching machine consists of two sections. One section is automatic feeding mechanism and the second section is conversion of rotary motion into linear reciprocating motion of punching tool. The first section consists of Geneva wheel disc keyed to shaft at one end and the other end is connected with chain sprocket wheel. This Geneva wheel shaft is supported on nylon bushes. This sprocket wheel transmit the rotary motion from the Geneva wheel to the feeding rollers through a chain drive. Hence when the Geneva wheel is rotated, the paper also moved for punching operation.
Key Words: Geneva wheel, Cam drive, Dc motor, Punch tool, Auto-roll punching.
1. INTRODUCTION [1] The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion. The rotating drive wheel has a pin that reaches into a slot of the driven wheel advancing it by one step. The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps. The name derives from the device's earliest application in mechanical watches; Geneva in Switzerland being an important center of watchmaking. The Geneva drive is also commonly called a Maltese cross mechanism due to the visual resemblance when the driven wheel has four spokes. Since they can be made small and are able to withstand substantial mechanical stress, these mechanisms are frequently used in watches.
Fig -1: Geneva wheel based auto roll punching machine The second section consists of electrically operated DC motor, nylon bush, crank wheel with a pin, connecting rod and punching tool. The second section is used to convert the rotary motion of the crank wheel into reciprocating motion of punching tool. The rotating shaft is keyed to the crank wheel at one end and the other end is connected to DC motor. This shaft is supported on nylon bush. The punch tool slide is reciprocated by the connecting the crank wheel through the connecting rod .The paper is fed automatically by the rotation of Geneva wheel.
In the most common arrangement, the driven wheel has four slots and thus advances by one step of 90 degrees for each rotation of the drive wheel. If the driven wheel has n slots, it advances by 360°/n per full rotation of the drive wheel.
Š 2017, IRJET
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