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

Specification	Value
Product Type	Upper Bending Blade
Tooling Category	Panel Bender Tooling
Application	Flexible Panel Bender / CNC Panel Bending Center
Overall Height	174 mm
Maximum Tool Width	40 mm
Reduced Section Width	25 mm
Working Radius	R4
Standard Length	1400 mm
Material	42CrMo Alloy Steel
Heat Treatment	Overall Quenching / Through-Hardening
Hardness	HRC46–52
Installation Position	Upper Bending Position
Typical Bending Direction	Downward Bending
Mounting Method	Multiple Mounting Holes
Construction	Long Continuous Blade
Custom Dimensions	Available
Custom Hole Pattern	Available
Machine Compatibility	According to Confirmed Interface Dimensions

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:

Tooling Component	Main Function
Blankholder Tool	Clamps the sheet from above
Counterblade	Provides fixed lower support
Upper Bending Blade	Performs controlled downward bending
Lower Bending Blade	Performs controlled upward bending
Special Panel Bender Tools	Support special clearance and forming requirements

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.

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