174mm R4 Upper Bending Blade for Flexible Panel Bender

The 174mm R4 Upper Bending Blade is a long-format panel bender tool developed for flexible sheet metal bending centers and automated panel bending machines. Installed in the upper bending position, it contacts the projecting sheet flange and follows the programmed machine trajectory to produce accurate and repeatable bends.

This upper blade has an overall height of 174 mm, a maximum width of 40 mm and a reduced lower section measuring 25 mm wide. The slimmed working profile provides additional clearance close to the bending zone, while the precision-machined R4 edge delivers controlled contact with the sheet during forming.

With a standard continuous length of 1400 mm, this blade is suitable for longer sheet metal panels, enclosures, doors and industrial components. Maintaining consistent geometry across a 1400 mm tool requires accurate machining, controlled heat treatment and careful inspection of straightness, parallelism and mounting-hole positions.

The blade is manufactured from 42CrMo alloy steel and receives overall quenching and through-hardening to HRC46–52. This material and heat-treatment combination provides the strength, toughness and working-edge durability required for repeated panel bending operations.

WYS Machinery manufactures replacement and custom upper bending blades according to original tooling drawings, physical samples, machine-interface dimensions and customer workpiece requirements.

Key Features

• Precision upper bending blade for flexible panel benders
• Overall tool height of 174 mm
• Maximum tool width of 40 mm
• Reduced lower section width of 25 mm
• Precision-machined R4 working radius
• Long continuous tool length of 1400 mm
• Manufactured from 42CrMo alloy steel
• Overall quenched and through-hardened
• Finished hardness of HRC46–52
• Extended length suitable for long sheet metal panels
• Reduced working profile provides clearance near the bending zone
• Multiple mounting holes support secure installation and alignment
• Suitable for replacement panel bender tooling
• Custom lengths, radii, hole patterns and profiles available

Technical Specifications

Function and Working Principle

During the panel bending cycle, the sheet metal is positioned between the blankholder and counterblade. The blankholder clamps the material securely against the fixed lower counterblade, establishing a stable and accurate bending line.

The upper bending blade then approaches the projecting sheet flange from the upper bending position. It follows a CNC-controlled trajectory rather than moving only in a straight vertical line. The coordinated movement applies controlled force to the sheet and produces the programmed downward bend.

The upper blade works as part of a complete panel bender tooling system:

By alternating the movements of the upper and lower bending blades, a flexible panel bender can produce positive and negative bends without repeatedly turning the entire workpiece.

R4 Working Radius

The R4 rounded working edge provides a broader contact profile than a smaller-radius blade. It helps the upper blade engage the sheet smoothly as it moves through the programmed bending trajectory.

Potential benefits of the R4 profile include:

• Smooth contact with the sheet surface
• Controlled transmission of forming force
• Reduced concentration of pressure at the working edge
• Stable bending along the full tool length
• Suitability for applications requiring a larger blade radius
• Consistent tool-path reference for repeat production

The final bend radius is influenced by the sheet material, thickness, workpiece geometry, clamping position and machine program. The R4 blade radius should therefore not be treated as the only factor determining the finished internal bend radius.

Alternative working radii can be manufactured according to customer drawings and actual bending requirements.

1400mm Long Continuous Blade

The 1400 mm continuous construction makes this upper bending blade suitable for processing longer sheet metal panels and extended bending lines.

Important manufacturing requirements for long panel bender blades include:

• Consistent working height
• Accurate straightness
• Uniform working-edge geometry
• Parallel mounting surfaces
• Correct mounting-hole positions
• Controlled heat-treatment deformation
• Reliable alignment after installation

A continuous blade eliminates joints along its 1400 mm working length. Where machine configuration or maintenance requirements call for a different arrangement, WYS can also manufacture shorter matched sections or segmented blade sets.

Reduced 25mm Working Section

The lower portion of the blade narrows from a maximum width of 40 mm to a 25 mm section. This reduced profile creates additional operating clearance near the working edge.

The slimmer section can help:

• Reduce interference near the bending zone
• Provide space for the projecting flange
• Improve access around partially formed workpieces
• Accommodate the programmed blade trajectory
• Support long-panel and enclosure bending
• Maintain structural strength in the upper tool body

The reduced profile can be customized when a different machine structure or workpiece geometry requires more or less clearance.

42CrMo Material and Overall Heat Treatment

The blade is manufactured from 42CrMo alloy steel, selected for its combination of strength, toughness and resistance to repeated mechanical loading.

The complete blade undergoes overall quenching and through-hardening to HRC46–52. Controlled heat treatment helps provide:

• Consistent hardness throughout the blade
• Reliable structural strength
• Resistance to repeated bending loads
• Improved working-edge wear resistance
• Dimensional stability during industrial operation
• A suitable balance between hardness and toughness

For a 1400 mm continuous blade, heat-treatment control is particularly important because excessive deformation could affect straightness, mounting alignment and working-edge consistency.

Typical Applications

This long upper bending blade is suitable for producing sheet metal panels and profiles used in:

• Electrical cabinets and control enclosures
• Long switchgear panels
• Elevator doors and interior panels
• Metal doors and door frames
• HVAC panels and ventilation components
• Industrial equipment covers
• Server and communication cabinets
• Storage cabinets and shelving systems
• Stainless steel kitchen equipment
• Appliance panels and housings
• Lighting enclosures
• Metal furniture components
• Long box-shaped sheet metal parts
• Multi-sided panels
• Customized precision sheet metal products

Actual processing capability depends on the panel bender model, sheet material, material thickness, flange dimensions, complete tooling configuration and programmed blade trajectory.

Product Details and Manufacturing Quality

Each upper bending blade can be manufactured according to an original technical drawing, physical sample or confirmed machine-interface information.

The manufacturing and inspection process may include:

• 42CrMo raw-material verification
• CNC profile machining
• Mounting-hole machining
• Controlled overall quenching
• Through-hardening
• Precision machining after heat treatment
• R4 working-radius inspection
• Overall height and width verification
• Reduced-section inspection
• Mounting-hole position verification
• Straightness inspection
• Parallelism inspection
• Working-edge consistency inspection
• Final dimensional and visual inspection

Special attention is given to straightness and alignment because the blade has a continuous length of 1400 mm.

Replacement Upper Bending Blades

This product can be supplied as a replacement upper blade for flexible panel benders and CNC panel bending centers with a matching interface.

To confirm compatibility, customers should provide:

• Machine brand and model
• Original upper blade drawing
• Machine-interface drawing
• Existing tooling dimensions
• Physical tool sample
• Mounting-hole pattern
• Installation photographs
• Required working length
• Finished workpiece drawings

Machine compatibility should be confirmed from the actual profile and mounting dimensions rather than assumed from the equipment brand alone.

Standard and Custom Panel Bender Tooling

WYS Machinery manufactures complete tooling solutions for flexible panel benders, including:

• Blankholder tools
• Counterblades
• Upper bending blades
• Lower bending blades
• Long continuous bending blades
• Segmented bending blade sets
• Special panel bender tools
• Custom replacement tooling

Available customization options include:

• Overall tool height
• Maximum tool width
• Reduced-section width
• Working-edge radius
• Continuous blade length
• Segmented construction
• Mounting-hole quantity and position
• Installation interface
• Clearance profile
• Heat-treatment requirements
• Surface treatment
• Special workpiece geometry

Customers can provide original tooling drawings, physical samples or finished sheet metal product drawings. WYS offers free tooling evaluation and design support to develop a suitable panel bender tooling solution.

Why Choose WYS Panel Bender Tooling

• Flexible panel bender tools manufactured from drawings or samples
• High-strength 42CrMo alloy steel construction
• Controlled overall quenching and through-hardening
• Precision-machined R4 working edge
• Experience manufacturing long continuous tooling
• Custom mounting holes and installation interfaces
• Continuous and segmented blade options
• Replacement upper blades for automated panel benders
• Free tooling evaluation and design support
• Dimensional inspection before delivery
• Protective packaging for long industrial tooling

Frequently Asked Questions

What is an upper bending blade on a flexible panel bender?

An upper bending blade is the working tool that contacts the projecting sheet flange from the upper bending position and follows a programmed trajectory to perform a controlled bend.

What is the difference between this upper blade and a blankholder?

The blankholder clamps and positions the sheet. The upper bending blade moves against the projecting flange to perform the actual forming operation.

What is the difference between an upper bending blade and a press brake punch?

A press brake punch normally moves toward a lower V-die. A panel bender upper blade follows a controlled trajectory around a sheet clamped between the blankholder and counterblade.

What is the working radius of this blade?

This model has an R4 working radius. Other working radii can be manufactured according to customer drawings and application requirements.

Does an R4 blade always produce an R4 internal bend radius?

Not necessarily. The finished radius is also influenced by the sheet material, thickness, tool path, clamping position and machine settings.

What is the advantage of the 1400 mm length?

The extended continuous length supports long bending lines and helps avoid joints across the working area when processing larger panels.

Can this upper blade be manufactured in segments?

Yes. WYS can supply continuous blades, matched sections or segmented tool sets according to the panel bender configuration.

What material and hardness are used?

The blade is manufactured from 42CrMo alloy steel, overall quenched and through-hardened to HRC46–52.

How is machine compatibility confirmed?

Compatibility is confirmed by comparing the blade profile, mounting interface, installation height, hole pattern and working position with the original tooling or machine drawing.