If the depth of the item created is equal toor greater than its radius, then the metalforming process called deep drawing.
Many parts made of sheet metal arecylindrical or box -shaped :for example,pots and pans,containetrs for food andkitchen sinks ,an automotive fuel tanks.Such parts are usually made by a processin which a punch forces on a flat sheetmetal blanks into a die cavity. Theprocess is generally called deep drawing.
Different metalsare used in deep 6:Irondrawing in whichsome metals arethese1:Alloy2:Aluminum3:Brass4:Cold rolled steel5:Copper
In the basic method,a round sheet metalblank is placed overa circular die openingand is held in placewith a blankholder,orhold-down ring. Thepunch travelsdownward and forcesthe blank into the diecavity, forming a cup.
To control the flow of the blank into the die cavity. Beads restrict the flow of the sheet metal by bending and unbending in during drawing.Draw bead diameters may rang from 13 mm to 20 mm (0.5 in to 0.75 in).
In deep drawing ,lubrication lowersforces, increases drawability,and reducesdefects in the parts. In general lubricationof the punch should be held becausefriction between the punch and the cupimproves draw-ability . Commonly used lubricants are mineraloils, soap solutions, and wax.
Deep drawing is especially beneficial whenproducing high volumes, since unit cost decreasesconsiderably as unit count increases: Once the tooling and dice have been created, theprocess can continue with very little downtime orupkeep. Tool construction costs are lower incomparison to similar manufacturing processes, suchas progressive die stamping, even in smaller volumes;in these situations deep drawing may also prove themost cost-effective manufacturing solution.When considering the functionality of the end product,deep drawing poses still more advantages.Specifically, the technique is ideal for products thatrequire significant strength and minimal weight.
Deep drawing maybe a viable productionsolution for any Complex axis- manufacturing process symmetricthat requires one ormore of the following . geometries: deep drawing delivers exceptional detailing Rapid cycle and accuracytimes: large quantities of productsare easilymanufactured throughdeep drawing
Deep drawing is a sheet metal formingprocess used to fabricate cup-shapedparts; bar drawing is a bulk deformationprocess used to reduce the diameter of acylindrical work part. The basic drawing process for a bar
Deep drawing is a metal forming process in whichsheet metal is stretched into the desired part shape.A tool pushes downward on the sheet metal, forcingit into a die cavity in the shape of the desired part. Stretch forming is a metal forming process in which apiece of sheet metal is stretched and bentsimultaneously over a die in order to form largecontoured parts. Stretch forming is performed on astretch press, in which a piece of sheet metal issecurely gripped along its edges by gripping jaws.