Die Ratio Sheet Metal

The cutting surface of the die is the edge of hardened steel strips known as steel rule.

Die ratio sheet metal.

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. A sheet metal blank is placed on a die and pushed through by a punch similar to the standard deep drawing process. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. The bending force can be calculated from the sheet thickness die opening bend length and the ultimate tensile strength of the material.

The drawing ratio dr diameter of the blank diameter of the punch achievable is usually about 2 0 the limiting drawing ratio ldr depending on the sheet material thickness and micro structure. For deep drawing without a blankholder thickness ratio should be at least 3. Bendlength thickness 2 dieopening bf tons bf 2000 where die opening thickness die ratio kfactor 1 46 0 016 die ratio bf bending force. Quick video about bend radius watch more tech tip videos bend radii minimum bend sizes.

The process requires sheet metal with a high thickness ratio to avoid wrinkling. These steel rules are usually located using saw or laser cut grooves in plywood. Protocase tech tip video. The die ratio may be entered to calculate the die opening which is typically 6 to 18 times the sheet thickness.

The free online v bending force. Vol 63 no 9 2017. Enter the values for v bending. When designing parts for laser cutting one should not make holes smaller than the thickness of the material.

Strojniški vestnik journal of mechanical engineering do 10 5545 sv jme 2016 4272 kw blanking. Ty jour au engin kaan emre au eyercioglu omer py 2018 06 27 ti the effect of the thickness to die diameter ratio on the sheet metal blanking process jf strojniški vestnik journal of mechanical engineering. Calculate metal sheet bender. 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 effect of the thickness to die diameter ratio on the sheet metal blanking process where f s is the frictional stress k is the shear yield stress and m is the friction factor. Sheet metal parts with a minimum of 0 9mm to 20mm in thickness can be manufactured. Steel rule die also known as cookie cutter dies are used for cutting sheet metal and softer materials such as plastics wood cork felt fabrics and paperboard. Bends in sheet metal are manufactured using sheet metal brakes.

With fine grain sheet metals controlled friction at the contact surface of the blank holder with the sheet the sheet with the die the punch to.