Analysis of Shearing Blade Types, Application Scenarios, and Purchase Guide

 

As an indispensable cutting tool in industrial production, the performance of shearing blades directly affects processing efficiency and product quality. This article will systematically elaborate on the classification system, industrial applications, and key points for purchasing shearing blades, providing professional guidance for practitioners.

 

I. Classification System of Shearing Blades

1. Classification by Edge Structure

• Convex Edge: Designed with an arc-shaped cutting edge, it is suitable for continuous shearing of high-strength metal sheets. It can effectively disperse shearing stress and reduce edge wear. Commonly used in flying shear equipment in the metallurgical industry, it can process steel plates with a thickness of over 3 mm [4].

• Bevel Edge: With a single-sided inclined edge structure, it is suitable for seamless cutting of flexible materials such as plastics and rubber, and the cut flatness can reach ±0.1 mm.

• Serrated Edge: Featuring a continuous toothed structure, it is specifically designed for anti-tearing cutting of fibrous materials such as wood and composite materials.

2. Classification by Material Type

• Tool Steel Blades: Alloy steels such as H13 and Cr12MoV can reach a hardness of 58 - 62 HRC after heat treatment, suitable for cutting ordinary carbon steels.

• Carbide Blades: Made of WC - Co series materials, with 3 - 5 times improved wear resistance, suitable for difficult-to-machine materials such as stainless steel and titanium alloy.

• Ceramic Composite Blades: Alumina-based composite materials with excellent high-temperature resistance, suitable for high-speed shearing scenarios.

 

II. Industrial Application Scenarios

1. Metal Processing Field

In automobile manufacturing, blades with a specification of 0.5 - 3.0 mm are used for blanking body sheets; in the construction industry, heavy-duty shearing blades are used to process structural parts such as H-beams, with a shearing force of up to 500 tons.

2. Plastic Products Industry

Ultra-thin blades of 0.2 mm are used for trimming precision injection-molded parts, and the surface roughness of the cut Ra ≤ 1.6 μm; double-edged blades are used for slitting PET sheets to ensure burr-free cutting.

3. Packaging and Printing Field

Special blades with a serration pitch of 2 - 5 mm are used for slitting corrugated paper, and the cutting speed can reach 200 m/min; extremely thin blades with an edge of 0.15 mm are equipped for cutting BOPP films to ensure a slitting accuracy of ±0.05 mm.

 

III. Professional Purchase Guide

1. Material Matching Principle

• For carbon structural steels, choose T8 - T12 tool steel blades.

• For stainless steel processing, it is recommended to use carbide-coated blades.

• For aramid composite materials, ceramic composite materials are preferred.

2. Selection of Specification Parameters

• Selection of Edge Angle: 20 - 30° for metal cutting and 30 - 45° for plastic cutting.

• Control of Thickness Tolerance: High-precision blades with a tolerance level of ±0.01 mm are required for precision machining.

• Straightness of the Edge: The deviation per 300 mm length should be ≤ 0.02 mm.

3. Key Points for Supplier Evaluation

• Check the ISO9001 Quality Management System certification.

• Request the material composition test report.

• Confirm the records of heat treatment process parameters.

• Examine the tool life commitment and after-sales service system.

 

IV. Usage and Maintenance Suggestions

1. Regularly grind the blade edge to maintain its sharpness.

2. Store blades of different materials in separate areas to avoid cross - contamination.

3. Equip the shearing equipment with an overload protection device.

4. Establish a tool usage ledger to record the cutting length and maintenance records.

By systematically understanding the technical characteristics and application specifications of shearing blades, enterprises can improve the equipment utilization efficiency by 15% - 30% and reduce the tool consumption cost by over 20%. It is recommended to obtain product manuals through formal industrial product procurement platforms and select the appropriate blades according to specific working conditions.