Sheet Metal Punch And Die Clearance Formula

T 3 5mm c 8 10 t.

Sheet metal punch and die clearance formula.

Each test result was recorded and a mathematical model was created. 18 165 mm thickness of bottom plate 2 td. When the die clearance is too tight the punch process creates secondary cracks which raises the punching force and shortens tool life bottom. Die clearance is equal to the space between punch and pie when the punch enters the die opening.

A long time industry rule of thumb used by die makers for the clearance between the punch and the die button is 5 of the stock thickness per side. 48 44 mm thickness of top plate 1 5 td 36 33 mm. Its value can be calculated according to the following punch and die clearance formula. Thickness of punch holder plate 12 11 mm thickness of stripper plate 0 75 td.

This provided an acceptable burr height and slug control. The clearance between punch and dies is represented by the total difference which is one of the critical factors in the punching process. 3 fs where fs shear force in tones td 2 422 cm td 24 22 mm thickness of punch holder plate 0 5 td. Enter information about your punch in row d.

Material thickness t 1 mm blanking clearance c 3 4 t. Determine the punch and die clearance by formula. Figure 5 when the tooling has the optimal amount of die clearance the shear cracks join. Enter information about the stock you are punching in rows a b and c below.

For example when using ø12 upper die and ø 12 25 lower die the optimal clearance is 0 25mm. T 1 3mm c 5 8 t. Material thickness x 15 example. T 1 3mm c 6 8 t.

16 gauge and lighter 006 15 gauge thru 13 gauge 010 3 32 up to 5 32 1 64 3 16 up to 15 32 1 32 1 2 up to 23 32 1 16 3 4 up to 31 32 3 32 1 and over. For more information please read proper die clearance. Regardless of material thickness the recommended penetration of the punch into a mate slugfree die is 0 118 3 00. This balances the punching force and optimizes part quality and tool life top.

Here s how to estimate die clearance required for punching steel and aluminium. Let s make holes faster.