Sheet Metal Shearing Clearance

To reduce this defect we recommend lowering the rake angle.

Sheet metal shearing clearance.

Brass soft cold rolled steel soft stainless steel 0 060. The effects of shearing on the material change as the cut progresses and are visible on the edge of the sheared material. Steel you might be able to shear 18 ga. At first cracks form in the sheet on both the top and bottom edges marked t and t in the figure.

Slitting usually produces a burr. Want to know how to estimate die clearance. The circular sheet metal cutters can be driven or the work may be pulled through idle cutters. As the punch descends further.

Toll free 1 800 235 6433 local 812 364 1448 email. Too large get pinched and cause an excessive burr clearance. For the cutting of medium thickness plate the shear clearance should be controlled between 8 12 according to experience. Clearance in sheet metal cutting distance between punch cutting edge and die cutting edge typical values range between 4 and 8 of stock thickness if too small fracture lines pass each other causing double burnishing and larger force if too large metal is pinched between cutting edges and excessive burr results.

Because the shear action and the pull function are coexisting in the shear process the larger the shear gap is the larger the proportion of the pulling function is the worse the shear quality correspondingly. Shearing conditions that increase this defect are related to sheet metal geometry high thickness reduced width short length material characteristics soft material uneven stress distribution and of course cutting parameters high rake angle high cutting speed. C a t metal group a 1100s and 5052s aluminum alloys all tempers 0 045 2024st and 6061st aluminum alloys. The metal is bending either because the blades are dull or you have too much clearance.

The size of this clearance is typically 2 10 of the material thickness and depends upon several factors such as the specific shearing process material and sheet thickness. Let s make holes faster. Has the best blade and price for your application. Clearance 4 8 but sometime 1 of thickness too small fracture does not occur requiring more force.

Shearing starts as the punch presses against the sheet metal. Slitting is a shearing process in which the sheet metal is cut by two opposing circular blades like a can opener. Slitting can be performed in a straight line or on a curved path. Dimensions for ordering common shapes.