Deep Drawing Ratio
Engg holymary institute of technology hyderabad india tkr college of engineering and technology hyderabad cdept of mechanical engineering cbit hyderabad india.
Deep drawing ratio. For deep drawing without a blankholder thickness ratio should be at least 3. A sheet metal blank is placed on a die and pushed through by a punch similar to the standard deep drawing process. The die when drawing without a blankholder will have a special curve to facilitate the forming of the part in this manner. Deep drawing is a sheet metal forming process in which a sheet metal blank is radially drawn into a forming die by the mechanical action of a punch.
It is thus a shape transformation process with material retention. The process is considered deep drawing when the depth of the drawn part exceeds its diameter. Lets explore the step by step process of deep drawing an axial symmetrical round cup out of 0062 inch material. The cup is 2 in.
In diameter and 8 in. Tall with no radius on top. Step 1calculate blank sizes. To process a deep drawn part you must first know three basic things.
The metal thickness the metal type and the blank size. Wire drawing duration. Fundamentals of manufacturing processes 20379 views. The draw ratio is among the most important elements to be considered when attempting to deep draw a round cup.
The draw ratio is the relationship between the size of the draw post and the size of the blank. The draw ratio must fall within acceptable limits to allow metal to flow. Deep drawing force calculate the required force to deep draw a piece of sheet metal based on the drawing ratio sheet thickness and the ultimate tensile strength of the material. The drawing ratio is a measure of the severity of the drawing operation and is the ratio of the initial blank diameter to the punch diameter.
Cup drawing or deep drawing is one of the widely used sheet metal forming operations. Cup shaped objects utensils pressure vessels gas cylinders cans shells kitchen sinksetc are some of the products of deep drawing. 3 of 9 holding plate or holding ring and pressed against the die cavity using a solid punch. Evaluation of limiting drawing ratio ldr in deep drawing by rapid determination method a c sekhara reddy srajesham and p.
Ravinder reddyc dept of mech.
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