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)

Types of press brake top punch

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

Pressure-tolerant Value(full length) 20TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 11TON/M Tip Radius 0.2R

 

Coordinate graph(1:1):

Standard Gooseneck Punch

Processing characteristics:

1. The application of the standard punch in the bending is mainly the avoidance of the W direction, and the bending diagram is as follows:

Standard Gooseneck Punch Bending Diagram

2. X direction: when Xmin>4mm, it can be bent (when the size is required in the W direction)

3. Y direction:when 0<Y<30mm, the Z direction cannot be avoided. When Y≧30mm, Z=Y-300

Split graph: B split

Standard Gooseneck Punch Split graphStandard Gooseneck Punch Split Graph HornHorn

 

02) Gooseneck Punch

Pressure-tolerant Value(full length) 50TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 45TON/M Tip Radius 0.2R

 

Coordinate graph(1:2)

 Gooseneck Punch Coordinate Graph

Processing characteristics:

1. The application of the gooseneck punch in the bending is mainly the avoidance of the W direction, and the bending diagram is as follows:

Gooseneck Punch Bending Diagram

2. X direction: when Xmin>9mm, it can be bent (when the size is required in the W direction)

3. Y direction: when 0<Y<85mm, the Z direction cannot be avoided. When Y≧85mm, Z=Y-85

Split graph: A split

Gooseneck Punch Split GraphGooseneck Punch Split Graph HornHorn

03) Gooseneck Punch

Pressure-tolerant Value(full length) 50TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 30TON/M Tip Radius 0.2R

 

Coordinate graph (0.8:1)

Gooseneck Punch Coordinate graph

Processing characteristics:

1. The application of the gooseneck punch in the bending is mainly the avoidance of the W direction, and the bending diagram is as follows:

Gooseneck Punch bending diagram

2. X direction: when Xmin>6mm, it can be bent (when the size is required in the W direction)

3. Y direction: When 0<Y<75mm, the Z direction cannot be avoided. When Y≧75mm, Z=Y-75

Split graph: A split

Gooseneck Punch Split graphGooseneck Punch Split graph hornHorn

 

3.2. Straight Punch

01) Sash Punch

Pressure-tolerant Value(full length) 30TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 15TON/M Tip Radius 0.2R

 

Coordinate graph(0.8:1)

Sash Punch Coordinate graph

Processing characteristics:

1. Suitable for bending symmetrical products. Both front and rear directions can be avoided.

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

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

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

5. The bendable length in the W direction is greater than the bendable length in the Z direction.

Sash Punch bending diagram

Split graph: B split

Sash Punch split graphSash Punch split graph hornHorn

02) Arrow Punch

Pressure-tolerant Value(full length) 50TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 12TON/M Tip Radius 0.2R

 

Coordinate graph(0.8:1)

Arrow Punch Coordinate graph

Processing characteristics:

1. Suitable for bending symmetrical products, both the front and rear directions can be avoided, and the bending opening can be as small as 6mm.

2. When X<50mm,Y<50mm,W and X direction can increase in proportion.

Arrow Punch Bending Diagram

Split graph: A split

Arrow Punch Split graphArrow Punch Split graph hornHorn

03) Acute Punch

Pressure-tolerant Value(full length) 100TON/M Material AM87 Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 20TON/M Tip Radius 0.65R

 

Coordinate graph(0.8:1)

Acute Punch Coordinate graph

Processing characteristics:

1. Applicable range is between 30 ° and 180 °

2. Use a small angle of the tip of the tool to avoid the tapped hole and other workpieces that need to be avoided.

Acute Punch Bending Diagram

3. It is used for deep bending, and the insertion depth is suitable for bending angle as shown in the following figure:

Acute Punch Bending Angle

Split graph: B split

Acute Punch Split graphAcute Punch Split graph hornHorn

 

04) Acute Punch

Pressure-tolerant Value(full length) 60TON/M Material AM87 Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 30TON/M Tip Radius 0.37R

 

Coordinate graph(1:1)

Acute Punch Coordinate graph

Processing characteristics:

1. Suitable for angles between 45° and 180°

Acute Punch Bending Angle

2. Use a small angle of the tip of the tool to avoid the tapped hole and other workpieces that need to be avoided.

Acute Punch Bending Diagram

Split graph:A split

Acute Punch Split graphAcute Punch Split graph hornHorn

 

05) Acute Punch

Pressure-tolerant Value(full length) 100TON/M Material AM87 Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 30TON/M Tip Radius 0.52R

 

Coordinate graph(1:1)

Acute Punch Coordinate graph

Processing characteristics:

1. Applicable range is between 30 ° and 180 °

2. Use a small angle of the tip of the tool to avoid the tapped hole

Acute Punch Bending Diagram

3. For deep bending, the depth of insertion is applicable to the bending angle as shown below

Acute Punch Bending Angle

Split graph: B split

Acute Punch Split graphAcute Punch Split graph hornHorn

 

3.3. Radius Punch

01) Radius Punch

Pressure-tolerant Value(full length) 45TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 45TON/M Tip Radius 1.5R,3.0R

 

Coordinate graph(1:1)

Radius Punch Coordinate graph

Processing characteristics:

1. R radius is 1.5,3.0

Radius Punch R radius

2. Radius punch is often used as bends for the upper cover

3. Sometimes used for shaping the workpiece with a small angle.

Split graph:A split

Radius Punch Split graphRadius Punch Split graph horn

02) Large Radius Punch

Pressure-tolerant Value(full length) 45TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) 45TON/M Tip Radius 3.0R,4.0R5.0R,6.0R,8.0R,10.0R

 

Graph (1:1)

Large Radius Punch Graph

Processing characteristics:

1. 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.

Large Radius Punch R radius

2. The radius punch is matched with the corresponding V groove

Combination graph:

Large Radius Punch Combination graph

3.4. Special Punch

01) Hemming Punch

Pressure-tolerant Value(full length) 100TON/M Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) Tip Radius

 

Graph (1:1)

Hemming Punch Graph

Processing characteristics:

1. 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.

Hemming Punch Bending Workpiece

2. Can also be used for pressing, riveting, shaping, etc.

Split graph:

Hemming Punch Split graph

02) Offset Punch

 

Pressure-tolerant Value(full length) / Material 42CrMo Heat Treatment HRC47±2
Pressure-tolerant Value(separated) / Tip Radius /

 

Graph (1:1)

Offset Punch Graph

Processing characteristics:

1. Used for Z bending which can’t be folded by common press brake dies.

H=1~10mm

Offset Punch Z Bending

2. The shape of the bend product is as shown in the upper right figure, usually called Z bend or offset.