Semi-continuous extrusion of round bars

Journal of Materials Processing Technology, 31 (1992) 441-443

441

Elsevier

Researchware

Semi-continuous extrusion of round bars S. Thiruvarudchelvan School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 2263 (Received April 24, 1991; accepted August 20, 1991 )

This researchware presents the concept of a novel semi-continuous extrusion process using text, diagrams, derivations, calculations and animation. The user can interact with the program by entering numerical values for the parameters of the process. Then, all calculations are performed by pressing the "enter" and "calculate" or similar buttons as appropriate. Once a value for a parameter is entered, it is updated on all windows for subsequent calculations. A "historical introduction" and references are provided, as in conventional research papers. Interactive calculations, diagrams, text and animation help in the understanding of the process. After all the calculations have been perFriction

Assisted

Round

Semi-continuous Extn~ion B a r s - a Researchware by

of

S. Thiruvarndchelven, Associate Professor, School o f Mechanical & P r o d u c t i o n Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 2263.

Summ~ry A n a n n u l a r uret1~np r o d confined in a cylindrical container is squeezed axially at one end to clamp the feedstock. The clamp builds up enough axial compresssive stress to upset the feedstock in the extrusion liner. As the feedstock, the clamp and the e x t r u s i o n container are then advanced against a s t a t i o n a r y die and punch, f r i c t i o n b e t v e e n the billet and the e x t r u s i o n liner helps increase the clamping pressure o n the u r e t h n ~ , v h H e simultaneously increasing the axial stress o n the billet to the e x t r u s i o n pressure at the die. The process is analysed theoretically to predict the conditions u n d e r v h i c h e x t r u s i o n is possible, and also the m a x i m u m stroke f o r the semi-continuous extrusion cycle. Using this r u s e a r c h v a r e o p t i m u m p a r a m e t e r s f o r such a process c a n be determined.

Fig. 1 (a)- (e). A selection of windows.

0924-0136/92/$05.00 © 1992 Elsevier Science Publishers B.V. All rights reserved.

442 SEMI-CONTINUOUS

[ .o,°,,o. )

EXTRUSION

INDEX

I Summary 1

INTRODUCTION OF THE CONCEPT PRINCIPLE OF OPERATION URETHANE CLAMP EFFECT OF STRESS-STRAIN CURVE STRESS BUILT UP ON THE BILLET EXTRUSION PRESSURE A U G M E N T I N G OF C L A M P I N G A C T I O N M I N I M U M L E N G T H OF BILLET

ANIMATION OF THE PROCESS O

RESULTS & CONCLUSION

INTRODUCTION OF THE CONCEPT PULL CYLINDERS

CYLINDER

SCHEMATIC DIAGRAM

HISTORICAL)

formed, a report is prepared automatically. All the windows can be printed by using the menu command "print window": a selection of windows is presented in Figs. 1 ( a ) - (e). The user can move between windows at will by pressing the appropriate buttons. The researchware is a stand-alone software t h a t can run on an Apple Macintosh computer.

443 U RETHANE CLAMP

Empirical formula [15]: F1-1~ildL1p.

01=99.01 MPa

ROSIN POWDER

0

I ANIMATE )

with UrethaneOuter Diameter without FeedstockDiameter d

T

Pressure on Urethane po MAXIMUM Coefficient of ~ AXIALSTRESS Friction, ~tl : 0.042 L~,..~--o.n) ON FEEDSTOCK GENERATED ~ ~ ~ I NOTATION) BYTHECLAMP

A N I M A T I O N OF T H E P R O C E S S

I AnimateCompleteCycle 1 IActivate Clampl I Upset Billet in ContainerI I Extrude

Copies of the program can be obtained from the author, at cost.