Translation:
Bending Mold Selection
Bending molds are tools used in bending machines to shape and process sheet metal. Different molds are composed of different components. They primarily achieve the shaping of the workpiece by changing the physical state of the material. They are used to transform the blank into a component with specific shape and dimensions under the pressure of the bending machine.
1. Composition of Bending Molds
Typically, molds consist of a middle plate, upper die, lower die, guide rails, lower die seat, etc. These molds have strong versatility and can complete most machining tasks.
2. Selection of Bending Molds
Different molds are used for processing different parts. It is necessary to have an understanding of the machining parameters of the machine tool and the mold in order to select matching molds.
Machine tool parameters include stroke, processing capacity, opening height, middle plate type, etc. Mold parameters include the type of upper die handle (matching the middle plate) and the pressure tonnage (maximum bending pressure).
Therefore, the selection needs to be made from both the "machine tool parameters" and "mold parameters" aspects.
A. Selection of Machine Tool Parameters
1. Selection of Mold Height
Stroke (mm) = Opening Height - Middle Plate Height - Upper Die Height - Lower Die Seat Height - (Lower Die Height - 0.5V + t), where t is the thickness of the plate (mm).
When selecting the lower die seat, attention should also be paid to the fact that there are various heights of the lower die seat, which are used to match different processing requirements.
Different combinations of molds can be used to obtain different mold combination heights for processing different parts.
B. Selection of Mold Parameters
1. Type of Upper Die Handle
There are three types of upper die handles to match different middle plates.
2. Shape of Upper Die
Common standard shapes of upper dies include:
3. Rounding Radius and Tip Angle of Upper Die
Common rounding radii used for upper dies include:
(1) 0.2R
(2) 0.6R
(3) 0.8R
(4) 1.5R
(5) 3.0R
Appropriate rounding radii are selected. Generally, R0.6 is used for thicknesses below 3mm.
Standard tip angles for upper dies include: 90°, 88°, 86°, 60°, 45°, 30°, etc.
The mold angle should be smaller than the bending angle. For example, if the workpiece is bent at 90°, an 88° angle mold should be used.
4. Type of Lower Die
Common types of lower dies include single V and double V. Within these two types, there are divided and integral variations. Different types of molds are suitable for different processing needs.
Generally, single V molds have a wider range of applications than double V molds, and divided molds have a wider range of applications than integral molds. Our company mainly uses double V and triple V lower dies.
5. Width of Lower Die V and V-Groove Angle
The selection of the V-groove in the lower die is related to the material thickness (T).
The V-groove angle of the lower die should be the same as that of the upper die.
Management of Bending Molds
After selecting matching molds, if proper management is not carried out, it will greatly shorten the service life of the molds and reduce the efficiency and quality of mold processing. Therefore, the selection of mold management methods that match the molds should not be overlooked.
Bending Mold Selection
Bending molds are tools used in bending machines to shape and process sheet metal. Different molds are composed of different components. They primarily achieve the shaping of the workpiece by changing the physical state of the material. They are used to transform the blank into a component with specific shape and dimensions under the pressure of the bending machine.
1. Composition of Bending Molds
Typically, molds consist of a middle plate, upper die, lower die, guide rails, lower die seat, etc. These molds have strong versatility and can complete most machining tasks.
2. Selection of Bending Molds
Different molds are used for processing different parts. It is necessary to have an understanding of the machining parameters of the machine tool and the mold in order to select matching molds.
Machine tool parameters include stroke, processing capacity, opening height, middle plate type, etc. Mold parameters include the type of upper die handle (matching the middle plate) and the pressure tonnage (maximum bending pressure).
Therefore, the selection needs to be made from both the "machine tool parameters" and "mold parameters" aspects.
A. Selection of Machine Tool Parameters
1. Selection of Mold Height
Stroke (mm) = Opening Height - Middle Plate Height - Upper Die Height - Lower Die Seat Height - (Lower Die Height - 0.5V + t), where t is the thickness of the plate (mm).
When selecting the lower die seat, attention should also be paid to the fact that there are various heights of the lower die seat, which are used to match different processing requirements.
Different combinations of molds can be used to obtain different mold combination heights for processing different parts.
B. Selection of Mold Parameters
1. Type of Upper Die Handle
There are three types of upper die handles to match different middle plates.
2. Shape of Upper Die
Common standard shapes of upper dies include:
3. Rounding Radius and Tip Angle of Upper Die
Common rounding radii used for upper dies include:
(1) 0.2R
(2) 0.6R
(3) 0.8R
(4) 1.5R
(5) 3.0R
Appropriate rounding radii are selected. Generally, R0.6 is used for thicknesses below 3mm.
Standard tip angles for upper dies include: 90°, 88°, 86°, 60°, 45°, 30°, etc.
The mold angle should be smaller than the bending angle. For example, if the workpiece is bent at 90°, an 88° angle mold should be used.
4. Type of Lower Die
Common types of lower dies include single V and double V. Within these two types, there are divided and integral variations. Different types of molds are suitable for different processing needs.
Generally, single V molds have a wider range of applications than double V molds, and divided molds have a wider range of applications than integral molds. Our company mainly uses double V and triple V lower dies.
5. Width of Lower Die V and V-Groove Angle
The selection of the V-groove in the lower die is related to the material thickness (T).
The V-groove angle of the lower die should be the same as that of the upper die.
Management of Bending Molds
After selecting matching molds, if proper management is not carried out, it will greatly shorten the service life of the molds and reduce the efficiency and quality of mold processing. Therefore, the selection of mold management methods that match the molds should not be overlooked.
