In the modern metal processing industry, as a key equipment for metal bending, the performance of a press brake is closely linked to the reasonable selection of press brake toolings. Selecting the right press brake tooling is as crucial as tailoring clothes to fit the body.
The Core Role of Press Brake Tooling in Press Brakes
Press brake tooling refers to the replaceable components that directly act on metal sheets, including the press brake punch and the press brake die. These two components work together to apply pressure, causing the sheet to undergo plastic deformation, enabling the forming of simple right-angle bends to complex multi-flanged structures.
The correct selection of press brake tooling is not only related to product quality but also has a far-reaching impact on equipment performance, production efficiency, and operational safety.
The Necessity of Choosing the Right Tooling
1. Decisive Impact on Product Quality
The accuracy of press brake tooling directly determines the quality of sheet metal bending. The shape and angle tolerances of press brake tooling are like the scales of precision instruments. Even slight deviations can cause the angle of the bent sheet to deviate from the design requirements.
In addition, if the surface of the press brake tooling is rough or has burrs, it is easy to leave scratches, dents, and other defects on the surface of the sheet. These defects not only affect the appearance of the sheet but may also reduce the functionality and service life of the product.
2. Potential Threats to Equipment Performance
The compatibility between press brake tooling and the press brake is crucial. If the press brake tooling does not match the pressure parameters, the overload operation of the press brake will cause excessive wear on key components such as the hydraulic system and transmission components.
In the long term, the equipment will exhibit obvious vibrations and noise, which not only affect the working environment but also significantly increase maintenance costs, lead to frequent shutdowns for repairs, and seriously disrupt normal production order.
3. Serious Constraints on Production Efficiency
Using poorly compatible press brake tools often requires operators to adjust and try multiple times to complete a single bend, which undoubtedly greatly prolongs the processing time for a single workpiece.
Frequent replacement and maintenance of tooling will take up a lot of production time, leading to delayed production progress and difficulty in meeting order delivery requirements, bringing huge production pressure and economic losses to enterprises.
4. Significant Impact on Operational Safety
Inferior or incompatible tooling can not only damage equipment but also pose a threat to the safety of operators. During the bending process, the instability or insufficient strength of the tooling may lead to serious safety accidents such as tooling breakage and workpiece splashing, endangering the life and health of operators.
How to Choose Suitable Press Brake Tooling?
1. Selection Based on the Characteristics of Processed Materials
Different metal sheets have different hardness, toughness, and ductility, which directly determine the selection of materials for press brake tooling. The core logic of sheet metal characteristics and tooling material selection is as follows in the table:
| Sheet Characteristics | Main Requirements for Tooling | Key Performance Indicators of Tooling Materials |
| High Hardness | Strong wear resistance and anti-deformation ability | Hardness, wear resistance, compressive strength |
| High Toughness | Strong impact resistance to avoid tooling fracture | Toughness, fatigue strength |
| Good Ductility | High surface precision requirements, need to reduce friction damage | Surface finish, anti-adhesion, wear resistance |
(1) High-Hardness Sheets (such as Stainless Steel, High-Strength Steel)
Representative Materials: 304 stainless steel, Q345 high-strength steel, aluminum alloy (such as 6061-T6).
Characteristics: High yield strength, large pressure on the tooling during bending, prone to causing wear or chipping of the tooling edges.
Requirements for Press Brake Tooling:
- High Hardness: The hardness of the tooling material should be higher than that of the sheet to avoid “soft material biting hard tooling”.
- High Wear Resistance: Reduce the friction loss between the sheet and the tooling surface.
- Compressive Strength: Withstand plastic deformation under high pressure.
Recommended Tooling Materials:
- Cr12MoV: Cold work die steel, with a hardness of 58-62HRC, excellent wear resistance and compressive strength, suitable for bending medium-batch high-hardness sheets.
- SKD11 (Japanese grade): High carbon and chromium content, strong wear resistance, suitable for high-precision and high-load bending.
- Cemented Carbide (such as YG8, YT15): With a hardness of 89-93HRA, extremely strong wear resistance, but high cost and low toughness, suitable for large-batch or ultra-thin high-hardness sheets (such as aerospace titanium alloys).
(2) High-Toughness Sheets (such as Low-Carbon Steel, Spring Steel)
Representative Materials: Q235 low-carbon steel, 65Mn spring steel, copper alloy (such as brass H62).
Characteristics: Large plastic deformation during bending, the tooling needs to withstand repeated impact loads, prone to fatigue fracture.
Requirements for Tooling:
- High Toughness: Avoid tooling cracking under cyclic loads.
- Fatigue Strength: Adapt to long-term continuous production.
- Surface Hardness: Balance wear resistance and impact resistance.
Recommended Tooling Materials:
- 42CrMo: Alloy structural steel, balanced strength and toughness, with a hardness of 30-45HRC, suitable for medium and large-sized tooling or scenarios requiring frequent bending.
- H13 hot work die steel: Although it is a hot work steel, due to its good toughness and thermal fatigue resistance, it can also be used for cold bending of high-toughness sheets, especially suitable for thick plates or complex bending processes.
- Surface nitriding treatment of die steel: Improve surface hardness (such as up to 55-60HRC) through surface hardening (such as nitriding, carburizing), while maintaining core toughness and reducing overall costs.
(3) High-Ductility Sheets (such as Pure Aluminum, Red Copper, Galvanized Sheet)
Representative Materials: Pure aluminum (1060), red copper (T2), galvanized steel sheet (such as SECC).
Characteristics: Easy to deform, but the surface is prone to scratches or adhesion to the tooling, with high requirements for forming precision and appearance.
Requirements for Tooling:
- Surface Finish: Mirror polishing treatment to reduce the friction resistance and adhesion between the sheet and the tooling.
- Anti-Adhesion: Avoid metal “biting the tooling” leading to surface scratching.
- Wear Resistance: Although the load is low, frequent bending still requires wear-resistant materials.
Recommended Tooling Materials:
- CrWMn: Low-alloy tool steel, with a hardness of 58-62HRC, good wear resistance and excellent cutting performance, suitable for precision tooling (such as electronic component bending).
- S136 stainless steel: Excellent corrosion resistance and mirror polishing performance, suitable for scenarios with extremely high surface quality requirements (such as kitchenware and decorative part bending).
- Coating treatment (such as TiN, CrN): Coat a hard film (with a hardness of 2000-3000HV) on the tooling surface to improve surface hardness and anti-adhesion, while retaining matrix toughness, widely used in soft materials such as aluminum alloys and copper alloys.
2. Consideration of Processing Technology Requirements
(1) Simple Straight Bending (such as V-shaped, U-shaped bending)
Process Characteristics: Simple sheet deformation, mainly bear local compressive stress.
Press Brake Tooling Selection Points:
- Strength and Wear Resistance: Give priority to medium and high carbon alloy steel (such as Cr12, Cr12MoV), with a hardness of HRC58-62 and good wear resistance, suitable for batch production of medium and low-strength sheets (such as low-carbon steel, aluminum sheets).
- Cost-Effectiveness: No need for excessively high toughness, which can reduce material costs.
(2) Complex Shape Bending (such as multi-flanged, arc-shaped, special-shaped structures)
Process Characteristics: The tooling needs to fit the complex curved surface of the sheet,bear uneven loads, and is prone to stress concentration and wear.
Press Brake Tooling Selection Points:
- High Toughness and Fracture Resistance: Select materials with good toughness (such as H13 hot work die steel), with an impact toughness value of ≥35J/cm², to avoid tooling cracking under complex stress.
- Surface Hardness and Polishing Performance: Require surface quenching (such as carburizing, nitriding) or coating treatment (such as hard chromium plating), with a surface hardness of ≥HV1000, to ensure no scratches on the sheet surface and facilitate demolding.
Example: When processing complex bends of automotive panels, 8407 hot work die steel is often used, whose high-temperature strength and wear resistance can meet the needs of multiple forming processes.
(3) Small-Angle Bending (such as ≤30°)
Process Characteristics: The acute-angle part of the tooling bears extremely high local pressure, prone to edge chipping or wear.
Press Brake Tooling Selection Points:
- High Hardness and Chipping Resistance: Select cemented carbide (such as YG8, YT15) or high-speed steel (W6Mo5Cr4V2), with a hardness of HRC63-66 and a compressive strength of ≥3000MPa, suitable for processing high-strength sheets (such as stainless steel, high-strength steel).
- Coating Strengthening: Adopt PVD coating (such as TiN, TiCN) with a coating thickness of 3-5μm, which can increase the tooling life by 3-5 times.
(4) Large-Radius Bending (such as R≥50mm)
Process Characteristics: Sheet deformation is mainly tensile, and the friction and wear on the tooling surface are significant.
Material Selection Points:
- Wear Resistance and Anti-Adhesion: Select surface-nitrided die steel (such as 42CrMo), with a nitriding layer depth of 0.3-0.5mm and a surface hardness of HV900-1200, which can reduce the adhesion between the sheet and the press brake tooling.
- Toughness Matching: The material matrix needs to have a certain degree of toughness (impact toughness ≥25J/cm²) to avoid fracture of large-curvature tooling during long-term use.
(5) High-Speed Bending (such as ≥10 times per minute)
Process Characteristics: The tooling frequently contacts high-temperature sheets (heat generated by bending), prone to thermal fatigue cracks.
Material Selection Points:
- Thermal Strength and Thermal Fatigue Resistance: Select hot work die steel (such as 3Cr2W8V), with high-temperature hardness (≥HRC40 at 500°C) and excellent oxidation resistance, suitable for continuous high-speed processing scenarios.
- Cooling Design Assistance: Cooperate with internal cooling channels of the tooling, and the material needs to have good thermal conductivity (such as aluminum alloy tooling, thermal conductivity ≥100W/(m·K)).
(6) Mass Production
Process Characteristics: The tooling needs to withstand more than tens of thousands of cyclic loads, and the cumulative effect of wear is significant.
Material Selection Points:
- Long-Life Materials: Give priority to powder metallurgy die steel (such as ASP23), which has good organizational uniformity and a fatigue strength 30%-50% higher than traditional die steel, suitable for million-level batch production.
- Surface Treatment Strengthening: Adopt laser cladding technology (cladding layer hardness ≥HRC60) to repair worn parts and extend the tooling service cycle.
(7) High Surface Precision Requirements
Process Characteristics: No scratches or dents are allowed on the sheet surface, and the tooling surface needs mirror polishing.
Material Selection Points:
- Mirror Polishing Performance: Select martensitic stainless steel (such as 440C) or pre-hardened plastic die steel (such as 718H), which have a factory hardness of HRC30-40 and can be directly polished to Ra≤0.05μm.
- Corrosion Resistance: When processing easily corroded sheets such as aluminum-magnesium alloys, stainless steel or nickel-phosphorus alloy-plated tooling should be used to avoid electrochemical corrosion from contaminating the sheet surface.
3. Matching Press Brake Parameters
When selecting tooling, various parameters of the press brake must be fully considered.
- Ensure that the tooling can withstand the maximum pressure of the press brake to avoid tooling damage caused by excessive pressure.
- Determine the installation space of the tooling according to the worktable size to ensure that the tooling can be smoothly installed without affecting equipment operation.
- The throat depth and opening height determine the selection of the tooling length and height to ensure the normal operation of the tooling during the work process.
- The installation method of the press brake tooling must be completely compatible with the press brake interface to ensure firm and stable installation.
Conclusion
Press brake tooling is the soul of bending processing. Choosing suitable tooling is not only a commitment to product quality but also a guarantee for production efficiency and equipment safety.
As LMRM, which has deepened the press brake tooling manufacturing industry for many years, we are based on full-process precision processing technology and a strict quality control system. Relying on a professional team, we can customize highly compatible press brake tooling for you according to different metal sheet characteristics, processing technology requirements, and equipment parameters.
Whether it is a complex special-shaped bend or a precision processing with extremely high precision requirements, we can provide one-stop solutions from selection, design to after-sales. If you are seeking high-quality tooling suppliers, welcome to contact LMRM at any time!
