Die Ratio Sheet Metal

Sharp corners on the.

Die ratio sheet metal.

The draw ratio is controlled by several basic factors. The punch is the desired shape of the base. The mechanical properties of the metal primary its r value or thickness strain ratio which is its ability to flow plastically and resist thinning. Figure 2 shows the basic pattern of metal flow when drawing a simple round cup.

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. Quick video about bend radius watch more tech tip videos bend radii minimum bend sizes. 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. In this study four different thickness to die diameter ratios t dm 1 5 t dm 1 10 t dm 1 30 and t dm 1 50 with five different clearances 1 3 5 10 and 20 of thickness were used to blank 2 mm thick round workpieces made of aisi 304 stainless steel.

This can be done with the. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. Deep drawing practice. 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.

Bend radii minimum bend sizes. When cutting sheet metal the punch and die edges do not have a radius. Both experimental and fem studies were accomplished. The press brake contains an upper tool called the punch and lower tool called the die between which the sheet metal is placed.

The die ratio may be entered to calculate the die opening which is typically 6 to 18 times the sheet thickness. Bf safetyfactor kfactor ultimatestrength bendlength thickness 2 dieopening bf tons bf 2000 where die opening thickness die ratio kfactor 1 46 0 016 die ratio bf bending force the free online v bending force calculator. Deep drawing the process. Deep drawing of sheet metal is performed with a punch and die.

Protocase tech tip video. The sheet is placed between the two and held in place by the backstop. The calculated tonnage can be used for the selection of a machine such as a press brake to perform the bending operation. Learn more about bending.