BLOCK DIES
| Block die type | Material | Type | Without scrap retention | With scrap retention | ||
|---|---|---|---|---|---|---|
| Round | Shaped | Round | Shaped | |||
| Block, straight | ||||||
 |
D2 Equivalent | Regular type | BLD | BLD□ | SR-BLD | SR-BLD□ |
| Powdered highspeed steel |
Regular type | PBLD | PBLD□ | SR-PBLD | SR-PBLD□ | |
| Block, single flange | ||||||
 |
D2 Equivalent | Regular type | BLDF | BLD□F | SR-BLDF | SR-BLD□F |
| Powdered highspeed steel |
Regular type | PBLDF | PBLD□F | SR-PBLDF | SR-PBLD□F | |
| Block, straight, small type | ||||||
 |
D2 Equivalent | Regular type | SBLD | SBLD□ | ||
| Powdered highspeed steel |
Regular type | SPBLD | SPBLD□ | |||
| Block, single flange, small type | ||||||
 |
D2 Equivalent | Regular type | SBLDF | SBLD□F | ||
| Powdered highspeed steel |
Regular type | SPBLDF | SPBLD□F | |||
| Block, configurable size | ||||||
 |
D2 Equivalent | Regular type | FBLD | FBLD□ | SR-FBLD | SR-FBLD□ |
| Powdered highspeed steel |
Regular type | FPBLD | FPBLD□ | SR-FPBLD | SR-FPBLD□ | |
| Block, fixingbolt | ||||||
 |
D2 Equivalent | Regular type | BBD | BBD□ | SR-BBD | SR-BBD□ |
Indication of block die relief angle
indicates a taper in which the diameter increases by 1mm over 50mm of length.
| Taper | 1/50 |
| Angle(A°) | 1.146° |
Dimension L of block die and spread of dimensions P and W(In case of 
)
Scrap retention block dies(For details, 
Click
here)
Scrap retention block dies include two or more slanted grooves machined on the inner surface of the die. The scrap initially punched out during the punching process forms small projections along the slanted grooves in the die. When the punching process pushes this scrap farther down to the bottom, the projections become compressed by the sides of the die("ironing" effect), preventing scrap lifting from occurring.
●Applicable range
1. Hole diameter:φ1.0~φ16
2. Workpiece material: Can be used for materials with tensile strengths up to
1,177N/mm2 (120kgf/mm2)
3. Thickness of workpiece materials: Minimum thickness 0.15 mm
4. The scrap retention effect cannot be obtained if the clearance(C) exceeds 20%
of the workpiece thickness(MT). Make sure that the clearance is 20% or less of MT.
Clearance(C)<Workpiece thickness(MT)×20%
Because scrap retention block dies prevent scrap lifting by forming small
projections on punching scrap, they are not suitable in cases such as punching of precision holes, or when the punched-out
item becomes the product. How to order block dies
The position of the shaped hole can be determined as needed within the allowable range.
