Chamunda Engineering Works

• Material: High-grade steel, primarily 42CrMo4 or EN31 (C45, Cr12MoV also used).
• Hardness: 45-60 HRC (surface hardened).
• Lengths: Standard sections like 835mm, 415mm, or custom lengths up to 20 ft.
• Structure:
  • Two-Stage Dies: Combine a - V-groove for pre-bending with a flat surface for final flattening.
  • Spring-Loaded Dies: Common for, allowing one-step, two-action flattening.
• Surface Tolerance: High precision, often around  to .
• Angle: The pre-bend typically uses a  or  angle.

• Chamunda CNC Press Brake Punch Die
• Material: High-tensile tool steel, commonly 42CrMo, 9CrSi, Cr12MoV (SKD11), or T10.
• Hardness: Hardened and ground, typically 47°–60° HRC.
• Lengths: Standard 835mm, 800mm, or 550mm, with 100mm, 200mm, or segmented options available for custom box bending.
• Precision Tolerance: Generally .
• Mounting Type: Popular types include Amada, Trumpf, and European (e.g., LVD) styles. 

• Types: Acute Angle, Gooseneck (for U-bends), Straight, and Acute/Stiffening Punch.
• Angle: Standard angles typically range from 25° to 60°.
• Radius: Nose radius varies based on the material thickness to be bent, often 0.4mm to 6mm.
• Types: V-Dies (single V or multi-V), U-Dies, Hemming Dies.
• V-Opening: Selected based on sheet thickness, generally  material thickness (the 8x rule).
• Angle: Common V-die angles include 30°, 60°, 80°, 85°, or 90°.
• Radius: V-top radius is designed to ensure smooth forming without surface damage. 
  • Air Bending: Requires the die opening to be around 6–8 times the material thickness.
  • Material Thickness & Radius: For materials < 6mm, internal bend radius typically equals the material thickness
Common Bending Configurations

• Process: Two-step (pre-bend at  then flatten) or single-step (specialized spring-loaded flattening).
• Material: Hardened high-strength tool steel or special steel, often with hardening on active components for durability.
• Tool Lengths: Standard sections (, ) or customized segmented pieces for specific box applications.
• Material Thickness: Suitable for thin sheets and materials up to  (higher thicknesses may require specialized pneumatic tools).
• Die Types: Spring-loaded hemming dies (reduces marking) or pneumatic, which can improve speed.
• Accuracy: High-precision manufacturing with tight tolerances to prevent tool deflection. 

• Spring-loaded Hemming Die: Features a hold-down device that holds the pre-bend, reducing, or preventing surface scratches.
• Two-Step System: Involves an initial  to  bend with a punch/die set, followed by a separate flattening stroke, ideal for heavier-duty or higher-strength materials.
• Adjustable/Shim Style Dies: Offer versatility in opening sizes, from  up to , with spacers to change the gap. 

• Tool Length Selection: Tools are available in  and  lengths, which can be combined.
• Bending Angle: The initial bend should generally be a  angle to ensure proper positioning for the final flat hem.
• Material Thickness: For thick materials, the bending force requirements are higher and must be accounted for.
• Safety Standards: Modern hemming dies are often designed with safety in mind, featuring falling prevention grooves.

Successfully ranked amongst the recognized business names of the industry, we are highly dedicated towards providing a supreme quality assortment of Press Brake Die And Punch.

Product Details:

• Simple installation

• Corrosion resistance

• User-friendly

• Longer working life

• Rugged structure

• Enhanced durability

• Structure: Typically a block with 4-way (4V) or multiple V-shaped grooves, allowing for quick rotation to switch die openings.
• Material & Hardness: Manufactured from high-strength forged steel or alloys like EN-31, EN-24, or 42CrMo, with hardness levels typically around  or up to  depending on the manufacturer.
• Applications: Ideal for sheet metal fabrication, automotive parts, and industrial, HVAC components requiring varied bends.
• Advantages: Increased efficiency, reduced setup time, and cost-effectiveness for small-batch production.
• Sizing: Available in various sizes, commonly ranging from  to  in length.
• Handling: Often feature lifting handles on both sides for easier handling and flipping. 

• Common Steel Grades: Most high-quality tools are made from 42CrMo (equivalent to AISI 4140) or EN31 (high-carbon chromium steel). These materials offer a balance of high tensile strength and toughness to resist chipping under heavy loads.
• Alternative Materials: For standard applications, C45 or EN8/EN9 may be used, while Cr12MoV (D2 equivalent) is used for extreme wear resistance. 

• Typical Hardness Range: Standard hardened tooling usually falls between 45–52 HRC. Some premium brands like Amada or LVD use specialized processes to reach 56–70 HRC on working surfaces.
• Treatment Types:
  • Through-Hardened: The entire tool is hardened, providing consistent performance throughout its life.
  • Induction Hardened: Only the working surfaces (punch tip and die shoulders) are hardened to high levels (52–60+ HRC) while maintaining a tough, ductile core to prevent tool breakage.
  • Laser Hardening/Nitriding: Advanced surface treatments that create an extremely hard, "slippery" layer (up to 62 HRC) to reduce friction and part marking. 

• Dimensional Tolerance: Precision ground tools typically maintain tolerances within ±0.01mm (±0.0004") to ±0.02mm. This allows multiple segments to be placed side-by-side without creating "steps" or uneven bend angles.
• Surface Finish: Grinding typically achieves a smooth finish (e.g., Ra 0.8μm) which minimizes friction and prevents marks on the workpiece.
• Geometric Alignment: CNC grinding ensures that the tang, shoulder, and tip are all perfectly aligned to a single central axis, which is vital for modern CNC crowning systems. 

• Length Options: Standard lengths are often 835mm (full) and 415mm (half), with sectionalized sets available for complex box bending.
• Common Angles: Punches and dies are typically available in standard angles such as 30°, 45°, 86°, 88°, and 90° to account for material springback.

• Material & Hardness: Typically high-tensile alloy steel like 42CrMo or 9CrSi, with induction-hardened working surfaces (50–60 HRC) to ensure durability.
• Precision & Tolerance: Ground to high accuracy, usually around \(\pm 0.01\text{mm}\) to \(\pm 0.02\text{mm}\) for consistent angular precision.
• Standard Lengths: Segmented sets are common (e.g., 835mm, 415mm, 800mm, 100mm) for flexible tool setups, particularly in CNC applications.
• Surface Treatment: Polished or treated with coatings (e.g., Titanium Nitride) to reduce friction and wear.

• Punches:
  • Gooseneck (Swan Neck): Used for deep, U-shaped bends, offering clearance for previously bent flanges.
  • Acute Angle (Needle) Punch: Specialized for \(30^{\circ}-60^{\circ}\) angles and air bending.
  • Straight Punch: General-purpose, heavy-duty tool.
• Dies:
  • V-Dies: Standard V-opening sizes (often 2V, 4V, or single V) determined by the rule of 8 (V-opening = \(8 \times\) material thickness).
  • Hemming Dies: Used for flattening the edge of the material.

• Clamping Systems: Tools are categorized by style, such as European-style, American-style, or specialized systems like Wila.
• Customization: Tools can be manufactured to specific, non-standard shapes and heights for special bending applications.
• Segmentation: Segmented tools allow for "crowding" (combining segments) to achieve specific lengths, allowing for efficient box bending.

Justifying our reputation in this market, we are immersed in the arena of offering to our patrons a broad consignment of Hemming Die.

Features:

• Precise design

• Durable

• Good quality