# How to Choose Press Brake Die

## 1. Press Brake Bending Toolings

In general, press brake die can be divided into the upper die, the lower die, guide rail, lower die base etc. These dies have a wide range of versatility, most of them can be fabricated.

## 2. How To Choose Press Brake Die

The different die should be used for fabricating different workpiece. You need to know the fabrication parameters of press brake machine as well as the die very well, then it is possible for you to choose the right press brake die to match each other.

The parameters of press brake including stroke, working ability, daylight (open height), middle plate type.

The parameters of the mold including upper die shank type (match middle plate), max bending pressure etc.

### A. How to choose press brake parameters

• #### Press brake die height

— Stroke（mm）=daylight – middle plate height – upper die height – lower die height -（lower die height – 0.5V+t）, t = plate thickness（mm）

Given: daylight 370mm, max stroke 100mm

Reach: stroke = 370-120-70-75-(26-0.5*8+t) = (83-t)mm

Note: 0.5V < stroke < max stroke

Please note the lower die base also have many different heights, which is used for different fabrication purpose. So don’t forget this when choosing lower die base.

Different tool & die cluster can obtain different combined height for different parts fabrication purpose.

### B. How to choose die parameters

#### 1. Upper die shank type

Upper die shank has three types to match different middle plate.

#### 2. Upper die shape

Common standard upper die:

#### 3. Upper die point radius & top angle

Common upper die point radius including:

（1）0.2R （2）0.6R （3）0.8R （4）1.5R （5）3.0R

How to choose proper press brake die point radius: choose R0.6 for plate thickness<3mm

Standard upper die point angle including: 90°, 88°, 86°, 60°, 45°, 30°, etc.

The dihedral angle of the die should less than fabrication angle. For example, if the workpiece’s bending angle is 90°, we should choose the die with 88° point angle.

#### 4. Lower die type

Generally, the lower die has single V type and double V type, among which it is separated into the separated die and full-length die. The different die is applied to different fabricating purpose.

However, the single-V die has much wider application than double-V die, while the separated die is more widely used than full-length die.

#### 5. Lower die V width, V groove angle

V groove choosing & plate thickness (T):

The V angle of lower die is same as upper die’s angle.

>> You can also check out The Ultimate Guide to Press Brake (2018 Updated) to fully understand things about press brake.

2018-05-02T11:58:04+00:00 Tooling|
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