Editorial Technical Reference

Lower Blade

This page explains how Lower Blade is classified within Fabricated Metal Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The stationary cutting blade in a sheet metal guillotine shear that works in conjunction with the upper blade to shear metal sheets.

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Product Specifications

Technical details and manufacturing context for Lower Blade

Definition

The lower blade is a critical component of sheet metal guillotine shears, serving as the fixed cutting edge against which the movable upper blade presses to perform clean, straight cuts through metal sheets. It is precisely mounted on the shear's bed or frame and remains stationary during operation, providing the counter-force necessary for the shearing action. This component is typically manufactured from tool steel, high-carbon steel, or alloy steel, with material grades such as Cr12MoV, 9CrSi, or H13 referenced in the directory. The blade length typically ranges from 1000 to 6000 mm to match the shear bed width, while the height ranges from 60 to 200 mm to ensure rigidity. Thickness varies from 20 to 50 mm, affecting cutting force capacity. The cutting angle, or rake angle, is typically 1 to 3 degrees. Hardness is specified as HRC 58–62 for wear resistance. Surface roughness is typically Ra 0.4–0.8 μm, and flatness is 0.02–0.05 mm/m to ensure uniform cutting. Weight ranges from 50 to 500 kg depending on size. These parameters are reference ranges and must be verified with the legal manufacturer or supplier for the specific model and application. The lower blade is essential for achieving precise cuts in metal fabrication, and its proper selection and maintenance are crucial for operational efficiency and safety.

Working Principle

The lower blade remains fixed while the upper blade descends with significant force. The metal sheet is placed between them. As the upper blade presses down, the material is forced against the sharp edge of the lower blade, creating a shearing action that cleanly separates the metal along the cutting line through plastic deformation and fracture. The lower blade provides the stationary counter-force, ensuring that the cut is straight and clean. The cutting angle and blade geometry influence the shearing force required and the quality of the cut edge. Proper alignment and sharpness of the lower blade are essential to prevent burrs or distortion. The material of the blade must withstand the high stresses and wear during operation, hence the specified hardness and material grades.

Common Materials

Tool steel, High-carbon steel, Alloy steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Blade Length	1000–6000 mm	Match shear bed width
Blade Height	60–200 mm	Determines rigidity
Blade Thickness	20–50 mm	Affects cutting force capacity
Cutting Angle	1–3 °	Typical rake angle
Hardness	HRC 58–62 HRC	For wear resistance
Material Grade	Cr12MoV, 9CrSi, H13	Select per applicationGB/T 1299
Surface Roughness	Ra 0.4–0.8 μm	Affects cutting qualityISO 1302
Flatness	0.02–0.05 mm/m	Ensures uniform cuttingISO 1101
Weight	50–500 kg	Depends on size

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Cutting Edge Part
Primary shearing surface that contacts and cuts the metal
Blade Body Part
Main structural support that holds the cutting edge and mounts to the shear bed
Wear Surface Part
Area that contacts the upper blade during shearing, designed for durability

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Sheet Metal Guillotine Shear

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Scrap Cutter

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Manufacturers of Lower Blade

Manufacturer profiles associated with Lower Blade.

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Frequently Asked Questions

What is the function of the lower blade in a guillotine shear?

The lower blade is the stationary cutting edge that works with the upper blade to shear metal sheets. It provides the counter-force against which the upper blade presses, enabling clean, straight cuts.

What materials are commonly used for lower blades?

Common materials include tool steel, high-carbon steel, and alloy steel. Specific grades such as Cr12MoV, 9CrSi, and H13 are referenced in the directory, but the actual grade must be confirmed with the manufacturer.

What are typical dimensions for a lower blade?

Typical blade length ranges from 1000 to 6000 mm, height from 60 to 200 mm, and thickness from 20 to 50 mm. These are reference ranges; exact dimensions depend on the shear model and must be verified.

How should I verify the specifications of a lower blade?

Always check the blade length, height, thickness, cutting angle, hardness, surface roughness, flatness, and material grade against the manufacturer's specifications for your specific shear model. Standards like ISO 1302 and ISO 1101 may be referenced for surface finish and flatness.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	N/A (stationary component, experiences shear force, not fluid pressure)
other spec:	Max shear force: Dependent on blade material and thickness; Typical blade hardness: 58-62 HRC for standard carbon steel blades
temperature:	Ambient to 150°C (302°F) for continuous operation, short-term peaks to 200°C (392°F)

Lower Blade

Product Specifications

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