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#122 Terminology and Surroundings (16) Names of Different Parts of Bending Shapes

Category : Terminology
April27, 2012

Sometimes it is difficult to refer by names to detailed parts when investigating a product of bending. The names of some parts that are convenient if remembered are given below.

[Fig. 1] shows the names related to the product shape.

Fig. 1 Names of different parts of a product formed by bending

(1)Web: The shape of the part that is being pressed by a pad during L-bending or U-bending is called a web.
(2)Flange: This is the name for the part that is bent lifted upward. In the case of V-bending of the plate both sides will become flanges.
(3)Inside bend radius: this is the rounding generated on the inside of the bend. There is a minimum value for this since cracks will be generated if this is too small. This is called the minimum inside bend radius.
(4)Bending angle: This is the angle from the web surface. This is not the angle on the side of the bending radius. This bending angle is used while calculating the development.
(5)Bending line: This is the line of intersection between the web surface and the flange surface.
(6)Bending width: This is the width corresponding to the length of the bending line.

[Fig. 2] shows the names of different parts of a bending die.

Fig. 2 Names of different parts of a die

In V-bending:

(1)Die shoulder width: The width between the lines of intersection of the V-shaped inclined surfaces and the top surface of the die.
(2)Die shoulder radius: This is the radius of the chamfer provided at the die shoulder. Normally this is made equal to the die shoulder width.
(3)Punch width: This is the width of the punch corresponding to the die shoulder width. Normally this is made equal to the die shoulder width.
(4)Punch shoulder radius: This is the radius of the chamfer provided at the tip of the punch. This will be the same as the inside bend radius of the product.

In U-bending:

(1)Die shoulder radius: This is the radius of the chamfer provided at the die shoulder. Normally, this is made equal to 2 to 4 times the blank plate thickness. The blank is bent while sliding along this surface.
(2)Punch shoulder radius (inside bend radius): This is the radius of the chamfer provided at the tip of the punch.
(3)Clearance: This is the size of the gap on one side between the punch and the die. Normally, this is made equal to the nominal dimensions of the blank plate thickness.

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