Frequently Asked Questions: CNC Press Brake Tooling & Segmented Bending Dies
Why is 42CrMo the industry standard for premium CNC press brake tooling?
42CrMo alloy steel is equivalent to AISI 4140, SCM440. This material delivers great fatigue strength and impact resistance, so it can hold up under extreme working loads and avoid sudden cracks. After thorough hardening, the working radii will not deform or collapse, even after years of non-stop operation.
What is the difference between full-body vacuum hardening and surface induction hardening?
Surface induction hardening only treats the outer layer of the steel, with a hardened depth of just 1 to 3 millimeters. The inner part remains soft, which makes the tool prone to bending or sagging under heavy loads.
We apply full-body vacuum heat treatment to all our press brake tools. The hardness reaches HRC 47–52 across the entire tool, from surface to core. This process relieves internal stress and keeps the dimensions accurate for long-term use.
How do ALAS segmented bending dies achieve a seamless bend line without manual shimming?
Every segment of our bending dies is precision ground, with a tight tolerance of ±0.01mm. All punch sections and V-dies run in perfect parallel. You can combine parts from different production runs freely, with no height difference between segments. There is no need to add shims manually anymore.
What are the consequences of using precision tooling on a machine with a misaligned backgauge?
Even top-grade press brake tools cannot make up for a poorly adjusted backgauge. If the backgauge stops are out of position or not calibrated correctly, metal sheets cannot sit evenly on the tooling. This will cause tapered bending angles, uneven flanges, and lead to abnormal wear on local areas of the dies.
How to choose the right V-die opening for different sheet thicknesses?
Here is the practical rule for mild steel:
For sheets thinner than 3mm: set V-groove width to 6 to 8 times the sheet thickness
For sheets between 3mm and 8mm: set V-groove width to 8 to 10 times the sheet thickness
For sheets thicker than 8mm: set V-groove width to 10 to 12 times the sheet thickness
A properly sized V opening cuts down bending resistance and prevents the dies from cracking under excessive stress.
What is the ideal solution for severe material springback?
Stainless steel and high-tensile metal will spring back heavily after bending. To get an accurate 90-degree bend, we produce custom segmented dies with acute angles, such as 30° and 45°. The machine can over-bend the material properly, and the finished part will rebound exactly to the target shape.
How do leading brake press tooling suppliers ensure tool interchangeability for international buyers?
As an experienced brake press tooling supplier, ALAS fully complies with global precision manufacturing standards. We use unified production drawings, professional CNC grinding equipment and strict quality checks to maintain ±0.01mm tolerance on all products. Our replacement die segments fit Amada, Trumpf, Wila and other mainstream tool systems perfectly, with no size gaps or height errors.
What to check when choosing reliable brake press tooling suppliers?
When sourcing press brake tooling, first confirm the raw material. Stick to manufacturers that use genuine 42CrMo/42CrMo4 steel. Check the heat treatment process as well — full-body vacuum hardening works far better than simple surface hardening. Reliable suppliers also offer OEM custom services based on your drawings.
For overseas shipments, good suppliers pack all tools with solid wooden cases for sea transport. This protects the tools from rust and edge damage during transit, so they are ready for heavy-duty production right after delivery.
