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. C****lassification and types**** of press brake top punch****: (Fig****.****1)**

**1. C**

**lassification 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**

**2.**

**The top punch of press brake is divided into two types: integral type and segmented type**

**Integrated top punch**835mm and 415mm**:**a segmentation and b segmentation**Segmented top punch:**

**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. Classification and application of various**

**top punch**

**3.1.**** Gooseneck 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 |

**C****oordinate ****graph****(1:1)****:**

**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:

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**

Horn

**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 |

**C****oordinate ****graph****(1:****2****)**

** **

**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:

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**

Horn

**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 |

**C****oordinate ****graph ****(0.8:1) **

**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:

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**

Horn

**3.2.**** Straight Punch**

**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)**

**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.

**Split graph****: ****B split**

Horn

**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)**

**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.

**Split graph****: ****A split**

Horn

**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)**

**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.

3. 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**

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) **

**Processing characteristics:**

1. Suitable for angles between 45° 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.

**Split graph****:****A split**

Horn

**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)**

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

3. 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**

**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)**

**Processing characteristics:**

1. R radius is 1.5,3.0

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**

**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)**

**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.

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

**Combination ****graph****:**

**3.4.**** Special Punch**

**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)**

**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.

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

**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)**

**Processing characteristics:**

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

H=1~10mm

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

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