The 173mm R3 Lower Bending Blade is a precision working tool designed for flexible panel benders and CNC panel bending centers. Installed in the lower bending position, the blade contacts the underside of the projecting sheet edge and follows the programmed machine trajectory to produce accurate upward bends.

This panel bender lower blade has an overall height of 173 mm, a maximum width of 40 mm and a standard continuous length of 1000 mm. Its offset lower profile provides functional clearance around the bending zone, while the precision-machined R3 working edge supports smooth and controlled contact with the sheet metal.

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 a dependable balance of strength, toughness and resistance to working-edge wear during repeated industrial panel bending cycles.

The lower bending blade works together with the upper bending blade, blankholder and counterblade as part of the complete flexible panel bender tooling system. The blankholder and counterblade first clamp and support the sheet along the bending line. The lower blade then moves along its programmed path to lift and form the projecting flange.

WYS Machinery supplies standard and custom lower bending blades based on original tooling drawings, machine-interface dimensions, physical samples or customer workpiece requirements.

Key Features

Precision lower bending blade for flexible panel benders
Overall height of 173 mm
Maximum tool width of 40 mm
Precision-machined R3 working radius
Standard continuous length of 1000 mm
Manufactured from 42CrMo alloy steel
Overall quenched and through-hardened
Finished hardness of HRC46–52
Offset working profile provides clearance near the bending area
Multiple mounting holes support secure installation and accurate alignment
Designed for controlled upward sheet metal bending
Suitable for replacement and customized panel bender tooling
Custom lengths, working radii and mounting interfaces available

Technical Specifications

Specification	Value
Product Type	Lower Bending Blade
Tooling Category	Panel Bender Tooling
Application	Flexible Panel Bender / CNC Panel Bending Center
Overall Height	173 mm
Maximum Tool Width	40 mm
Working Radius	R3
Standard Length	1000 mm
Material	42CrMo Alloy Steel
Heat Treatment	Overall Quenching / Through-Hardening
Hardness	HRC46–52
Installation Position	Lower Bending Position
Typical Bending Direction	Upward Bending
Mounting Method	Multiple Mounting Holes
Construction	Continuous Blade
Custom Length	Available
Custom Working Radius	Available
Custom Hole Pattern	Available
Machine Compatibility	According to Confirmed Interface Dimensions

Function and Working Principle

During a typical panel bending cycle, the sheet is positioned and clamped between the blankholder and counterblade. The lower bending blade approaches the projecting flange from below and moves along a CNC-controlled trajectory to form the required upward bend.

The final bend depends on several coordinated factors:

Lower blade movement and programmed trajectory
Sheet material and thickness
Blankholder and counterblade position
Working-edge radius
Flange dimensions
Material springback
Machine control parameters

The lower blade can work alternately with the upper bending blade, allowing a flexible panel bender to produce upward and downward bends without repeatedly turning or manually repositioning the workpiece.

Unlike conventional press brake tooling, the panel bender does not normally form the sheet between a vertically moving punch and a V-die. Instead, the blankholder secures the sheet while the bending blades perform controlled movements around the bending line.

R3 Working Edge

The R3 rounded working edge provides stable contact with the underside of the sheet during upward bending. Its precision-machined profile helps transmit bending force smoothly along the working length and reduces excessive concentration of pressure at the blade edge.

A consistent working radius also contributes to predictable tool-path programming and repeatable forming results. The most suitable blade radius depends on:

Sheet material
Material thickness
Required inside bend radius
Surface condition
Flange geometry
Machine bending trajectory

WYS Machinery can produce different working radii according to customer drawings and panel bending requirements.

Offset Lower Profile

The offset geometry close to the working edge creates additional clearance around the bending zone. This design helps the lower bending blade approach and lift the projecting sheet flange while reducing potential interference between the blade body and the forming workpiece.

The available clearance and achievable geometry depend on the machine stroke, tool installation position and workpiece profile. WYS can adjust the blade profile according to the customer’s machine interface and finished component drawing.

42CrMo Material and Heat Treatment

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

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

Consistent hardness across the complete blade
Reliable mechanical strength
Improved working-edge wear resistance
Dimensional stability during repeated operation
Resistance to deformation under normal working conditions
An appropriate balance between hardness and toughness

Critical working and mounting surfaces are subsequently machined according to the confirmed dimensional requirements.

Typical Applications

This lower panel bender blade can be used for manufacturing sheet metal panels and profiles for:

Electrical cabinets and control enclosures
Switchgear cabinets
Elevator panels
Metal doors and door frames
HVAC panels and ventilation components
Storage cabinets and shelving
Industrial equipment covers
Stainless steel kitchen equipment
Metal furniture components
Appliance housings
Lighting housings
Box-shaped sheet metal components
Multi-sided panels and enclosures
Customized precision sheet metal parts

Actual application capability depends on the machine model, sheet material, material thickness, workpiece geometry, blade interface and programmed bending sequence.

Product Details and Manufacturing Quality

Each lower bending blade can be manufactured according to an original tool drawing, physical sample or confirmed machine-interface dimensions.

The manufacturing and inspection process may include:

Raw-material verification
CNC profile machining
Precision mounting-hole machining
Controlled overall quenching
Through-hardening
Precision working-edge machining
R3 radius inspection
Overall height and width verification
Mounting-hole position inspection
Straightness inspection
Parallelism inspection
Final dimensional and visual inspection

Accurate hole positioning and consistent profile geometry help ensure reliable mounting and alignment across the complete 1000 mm blade length.

Replacement Lower Bending Blades

This product can be supplied as a replacement lower blade for flexible panel benders and automated sheet metal bending centers with a matching installation interface.

Because different panel bending machines may use different blade profiles, mounting holes and interface dimensions, compatibility should be confirmed using:

Machine model and tooling information
Original lower blade drawing
Machine-interface drawing
Existing tool measurements
Physical tooling sample
Clear photographs of the installation position

Machine compatibility should not be assumed from the equipment brand alone.

Standard and Custom Panel Bender Tooling

WYS Machinery manufactures standard and customized tooling for flexible panel benders and CNC panel bending centers. Customers can provide original tooling drawings, worn tool samples, machine-interface dimensions or finished workpiece drawings.

Available customization options include:

Overall tool height
Maximum tool width
Offset blade profile
Working-edge radius
Overall blade length
Continuous or segmented construction
Mounting-hole quantity and position
Machine installation interface
Working-edge geometry
Heat-treatment requirements
Surface treatment
Special clearance profiles

WYS also provides tooling evaluation and design support. Customers can send their sheet metal product drawings, material information and bending requirements so that a suitable panel bender tooling solution can be developed.

Why Choose WYS Panel Bender Tooling

Precision tooling manufactured from drawings or samples
High-strength 42CrMo alloy steel construction
Controlled overall heat treatment
Customized tool profiles and working radii
Custom mounting holes and installation interfaces
Continuous and segmented tooling options
Replacement blades for flexible panel benders
Panel bending tooling design and application support
Dimensional inspection before delivery
Custom packaging based on tool dimensions

Frequently Asked Questions

What is a lower bending blade on a panel bender?

A lower bending blade is the working tool installed in the lower bending position of a flexible panel bender. It contacts the projecting sheet flange from below and moves along a programmed trajectory to produce an upward bend.

Is a lower bending blade the same as a counterblade?

No. A lower bending blade moves to form the sheet, while the counterblade supports the sheet and works with the blankholder to establish a stable bending line.

Is this the same as a press brake lower die?

No. A press brake lower die normally contains a V-opening that works with an upper punch. A panel bender lower blade follows a controlled trajectory to lift and form the projecting sheet edge.

What is the working radius of this lower blade?

The blade has an R3 working radius. Other radii can be manufactured according to the sheet material, required bend geometry and customer specifications.

What material and hardness are used?

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

Can the blade dimensions be customized?

Yes. The height, width, working radius, profile, length, mounting holes and installation interface can be customized according to drawings or original samples.

How is machine compatibility confirmed?

Compatibility is determined by checking the tool profile, mounting interface, hole pattern and critical dimensions. Providing an original tooling drawing or physical sample is recommended.

Lower Bending Blades

173mm R3 Lower Bending Blade for Flexible Panel Bender