Rotary shear blade manufacturing process: From raw steel to finished product

Rotary shear blades are a core consumable in the steel coil slitting industry, and their manufacturing quality directly impacts cutting accuracy, speed, and service life. Many customers understand the blade material but are unaware of the complete process from raw steel to the finished product. Today, we'll take you inside the factory to see how a high-quality rotary shear blade is made.

I. Material Selection: High-Quality Steel is Key

Rotary shear blades commonly use high-grade tool steel, such as:

Cr12MoV

D2 (SKD11)

H13

High-speed steel M2, M35

Powder high-speed steel (according to customer requirements)

The raw materials must possess:

✔ High hardness

✔ Good wear resistance

✔ Impact resistance

✔ Uniform microstructure

Only by controlling quality from the source can the blades have a stable processing foundation.

II. Forging/Cutting: Processing Steel into Blanks

Depending on the blade diameter, thickness, and assembly dimensions, the steel needs to undergo:

Furnace heating

Forging

Sawing, flame cutting, or wire cutting

The purpose is to:

✨ Improve microstructure

✨ Increase density and toughness

✨ Prepare for subsequent precision machining

High-standard blanks mean the blades are less prone to cracking and more wear-resistant.

III. Precision Machining: Forming the Final Blade Dimensions

The blanks enter the CNC machining workshop and are completed through multiple processes:

CNC turning

External cylindrical grinding

Internal hole grinding

Edge grinding and finishing

Precision machining requires extremely high standards, especially for:

🟩 Edge angle

🟩 Parallelism

🟩 Concentricity

🟩 Surface finish

This step determines whether the blade can maintain stable cutting in high-speed equipment.

IV. Heat Treatment: Enhancing Hardness and Service Life

Heat treatment is the soul of rotary shear blade manufacturing.

Including:

Vacuum quenching

Tempering

Deep cryogenic treatment (optional)

Through precise temperature control, the blades achieve:

🚩 Uniform hardness

🚩 Stronger wear resistance

🚩 Higher resistance to chipping

Too low hardness results in poor durability, while too high hardness leads to chipping, so heat treatment must be precise.

V. Precision Grinding and Polishing: Ensuring Cutting Quality

After heat treatment, the blades are processed again due to micro-deformation:

Precision grinding of end faces and inner holes

Edge polishing

Dimensional inspection of each piece

Finally, achieving an almost mirror-like finish,

ensuring that the blade remains sharp and stable even at high rotational speeds. VI. Inspection and Packaging: Controlling the Quality of Every Blade

Each blade undergoes a thorough inspection:

✔ Hardness

✔ Concentricity

✔ Outer diameter and inner bore dimensions

✔ Blade edge precision

✔ Surface defect inspection

After passing inspection, the blades are coated with anti-rust oil, packaged, and marked with specifications and batch numbers for traceability.

Conclusion: Quality Comes from Details, Longevity Comes from Craftsmanship

Rotary shear blades may seem simple, but they involve dozens of processing steps.

We consistently adhere to:

🔧 Carefully selected steel materials

🧊 Professional heat treatment

🎯 Precision machining

🛡 Strict quality control

All to ensure our customers receive blades with longer lifespan, less downtime, and higher efficiency.

If you require custom specifications, special materials, or technical guidance,

please feel free to contact us. We will provide professional solutions for your production line.

Company Website: https://www.mingbaiblade.com

Whatsapp: +86-13855519988