By reading this article, you will know the practical use of the press brake dies and its scope of use, and quickly select the reasonable tool for the subsequent bending process.
Brief introduction
Bending is the bending of the mold by the press brake machine, so that the sheet is bent.
Bending mold, also known as press brake knives or blades, are divided into top punch and bottom dies.
The top punch is also called a folding blade.
The specific classification of the upper and lower molds is shown in Fig. 1;
1. Classification and types of press brake top punch: (Fig.1)
Fig.1
2. The top punch of press brake is divided into two types: integral type and segmented type
 Integrated top punch: 835mm and 415mm
 Segmented top punch: a segmentation and b segmentation
A split length: 10,15,20,40,50,100 (right horn),100(left horn),200,300;
B split length: 10,15,20,40,50,100(right horn),100(left horn),165,300;
3. Classification and application of various top punch
3.1. Gooseneck Punch
01) Standard Gooseneck Punch
Pressuretolerant Value(full length)  20TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  11TON/M  Tip Radius  0.2R 
Coordinate graph(1:1):
Processing characteristics:
 The application of the standard punch in the bending is mainly the avoidance of the W direction, and the bending diagram is as follows:
 X direction: when Xmin>4mm, it can be bent (when the size is required in the W direction)

Y direction:when 0<Y<30mm, the Z direction cannot be avoided. When Y≧30mm, Z=Y300
Split graph: B split
Horn
02) Gooseneck Punch
Pressuretolerant Value(full length)  50TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  45TON/M  Tip Radius  0.2R 
Coordinate graph(1:2)
Processing characteristics:
 The application of the gooseneck punch in the bending is mainly the avoidance of the W direction, and the bending diagram is as follows:
 X direction: when Xmin>9mm, it can be bent (when the size is required in the W direction)

Y direction: when 0<Y<85mm, the Z direction cannot be avoided. When Y≧85mm, Z=Y85
Split graph: A split
Horn
03) Gooseneck Punch
Pressuretolerant Value(full length)  50TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  30TON/M  Tip Radius  0.2R 
Coordinate graph (0.8:1)
Processing characteristics:
 The application of the gooseneck punch in the bending is mainly the avoidance of the W direction, and the bending diagram is as follows:
 X direction: when Xmin>6mm, it can be bent (when the size is required in the W direction)

Y direction: When 0<Y<75mm, the Z direction cannot be avoided. When Y≧75mm, Z=Y75
Split graph: A split
Horn
3.2. Straight Punch
01) Sash Punch
Pressuretolerant Value(full length)  30TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  15TON/M  Tip Radius  0.2R 
Coordinate graph(0.8:1)
Processing characteristics:
 Suitable for bending symmetrical products. Both front and rear directions can be avoided.

When Xmin>10mm,W and X direction can increase in proportion.

When 0<Y<20mm,Z=0.

When Y>20mm, Y and Z directions can increase in proportion.

The bendable length in the W direction is greater than the bendable length in the Z direction.
Split graph: B split
Horn
02) Arrow Punch
Pressuretolerant Value(full length)  50TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  12TON/M  Tip Radius  0.2R 
Coordinate graph(0.8:1)
Processing characteristics:
 Suitable for bending symmetrical products, both the front and rear directions can be avoided, and the bending opening can be as small as 6mm.

When X<50mm,Y<50mm,W and X direction can increase in proportion.
Split graph: A split
Horn
03) Acute Punch
Pressuretolerant Value(full length)  100TON/M  Material  AM87  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  20TON/M  Tip Radius  0.65R 
Coordinate graph(0.8:1)
Processing characteristics:
 Applicable range is between 30 ° and 180 °

Use a small angle of the tip of the tool to avoid the tapped hole and other workpieces that need to be avoided.
 It is used for deep bending, and the insertion depth is suitable for bending angle as shown in the following figure:
Split graph: B split
Horn
04) Acute Punch
Pressuretolerant Value(full length)  60TON/M  Material  AM87  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  30TON/M  Tip Radius  0.37R 
Coordinate graph(1:1)
Processing characteristics:
 Suitable for angles between 45° and 180°
 Use a small angle of the tip of the tool to avoid the tapped hole and other workpieces that need to be avoided.
Split graph:A split
Horn
05) Acute Punch
Pressuretolerant Value(full length)  100TON/M  Material  AM87  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  30TON/M  Tip Radius  0.52R 
Coordinate graph(1:1)
Processing characteristics:
 Applicable range is between 30 ° and 180 °

Use a small angle of the tip of the tool to avoid the tapped hole
 For deep bending, the depth of insertion is applicable to the bending angle as shown below
Split graph: B split
Horn
3.3. Radius Punch
01) Radius Punch
Pressuretolerant Value(full length)  45TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  45TON/M  Tip Radius  1.5R,3.0R 
Coordinate graph(1:1)
Processing characteristics:
 R radius is 1.5,3.0
 Radius punch is often used as bends for the upper cover

Sometimes used for shaping the workpiece with a small angle.
Split graph:A split
02) Large Radius Punch
Pressuretolerant Value(full length)  45TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  45TON/M  Tip Radius  3.0R,4.0R5.0R,6.0R,8.0R,10.0R 
Graph (1:1)
Processing characteristics:
 This large radius punch is mainly used for bending the inner arc angle of R, and the radius of the arc angle is R3~R10.
 The radius punch is matched with the corresponding V groove
Combination graph:
3.4. Special Punch
01) Hemming Punch
Pressuretolerant Value(full length)  100TON/M  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  Tip Radius 
Graph (1:1)
Processing characteristics:
 The figure diagram shows the shape of the product after bending and flattening. All similar shapes can be bent. It should be used with 30° upper and lower molds.
 Can also be used for pressing, riveting, shaping, etc.
Split graph:
02) Offset Punch
Pressuretolerant Value(full length)  /  Material  42CrMo  Heat Treatment  HRC47±2  
Pressuretolerant Value(separated)  /  Tip Radius  / 
Graph (1:1)
Processing characteristics:
 Used for Z bending which can’t be folded by common press brake dies.
H=1~10mm
 The shape of the bend product is as shown in the upper right figure, usually called Z bend or offset.