Mingbai Machinery Tool Successfully Develops Gradient Hardness Composite Structure Slitter Shear Blade, Breaking the "Hardness vs. Toughness" Paradox

Recently, the R&D center of Mingbai Machinery Tool Technology Co., Ltd. reported a breakthrough: after nearly four months of repeated trials and process optimization, a new type of slitter shear blade featuring a gradient hardness composite structure has successfully passed internal bench tests and entered the customer trial phase. Targeting the precision slitting needs of difficult-to-cut materials such as high-strength steel and silicon steel, this product innovatively resolves the long-standing technical contradiction of traditional blades – "high hardness leads to brittleness, while good toughness results in poor wear resistance." This marks another key step forward for the company in the field of high-end custom blades.

Addressing the Pain Points of High-Strength Material Slitting

With the development of industries such as new energy vehicles, motor cores, and transformers, the usage of materials like silicon steel, high-strength steel, and electrical steel has increased significantly. These materials are characterized by high hardness and magnetic sensitivity, imposing stringent demands on the wear resistance, chipping resistance, and cut surface quality of slitting blades. Conventional homogeneous hardness blades either suffer from edge chipping or excessive wear, and frequent blade changes severely impact production efficiency. After conducting on-site investigations at several silicon steel processing enterprises, the R&D team of Mingbai Machinery Tool officially initiated the project at the end of 2025, determined to solve this common industry problem.

Gradient Hardness Composite Structure – Combining Rigidity and Toughness

Moving away from the traditional "single hardness" design concept, the R&D team creatively proposed a composite structure solution featuring "high-toughness substrate + high-hardness surface layer + intermediate gradient transition." The blade substrate uses a self-developed micro-alloyed tool steel. After vacuum heat treatment and cryogenic treatment, the core hardness is controlled at 48-52 HRC, ensuring overall impact toughness. Through precise control of carburizing or surface strengthening processes, a hardened layer approximately 1.5-2 mm thick is formed on the cutting edge and working surface, achieving a surface hardness of 62-65 HRC. Between the substrate and the hardened layer, a gradient transition zone with gradually varying composition and hardness is set, effectively eliminating the risk of spalling caused by abrupt property changes.

Impressive Test Data and Customer Anticipation

In internal simulation tests, the new gradient hardness slitter shear blade continuously slit silicon steel strip of 0.35 mm thickness for over 100,000 meters without visible edge wear or chipping. The burr height on the slit cross-section was stably controlled within 0.015 mm, and the service life increased by more than 50% compared to conventional blades. Currently, this product has been provided to three motor core processing enterprises for on-machine testing. A technical director from one customer commented, "The trial cutting performance of Mingbai's blade exceeded our expectations and solved the pain point of frequent machine shutdowns for blade changes. If subsequent batch verification proves stable, we will completely replace our existing blades."

Continuous Innovation, Never Stopping

The company's R&D director stated, "The success of the gradient hardness structure is the result of our long-term accumulation in materials science and heat treatment processes. In the future, Mingbai will continue to focus on the cutting-edge needs of the precision slitting field, launching one or two innovative products with independent intellectual property rights each year, providing customers with more efficient and economical cutting solutions." The company's general manager also emphasized that R&D is the lifeline of Mingbai, and the company will continue to increase investment to build a leading technological innovation platform in the industry.

Website: www.mingbaiblade.com