These parts are high-precision shearing blades used in electronics assembly lines, designed for cutting optical fibers or fine metal wires. Our customer is an automation equipment manufacturer, who required custom blades that simultaneously feature extremely high hardness, excellent wear resistance, and perfectly formed cutting edges.
The customer’s core pain points were as follows:
M2 high-speed steel is renowned for its high hardness, superior wear resistance, and good red hardness, making it an ideal material for manufacturing cutting tools. However, this high-hardness property makes it extremely difficult to machine—posing significant challenges to tool life and machining stability.
The blades’ cutting edges must have perfect straightness, angle accuracy, and surface finish to ensure smooth, precise, and long-lasting sharpness during shearing. Even minor geometric deviations can lead to reduced cutting quality.
M2 steel requires strict heat treatment (quenching and tempering) to achieve the final high hardness. Controlling part deformation during heat treatment while ensuring uniform hardness and no cracks is critical to determining the blades’ performance.
After heat treatment, the blades have extremely high hardness and can only be final-finished and have their cutting edges formed through CNC grinding. This process requires ultra-high-precision grinding machines and professional grinding strategies.
To perfectly address the customer’s challenges, we provided a professional manufacturing solution that integrated three key processes—CNC machining, heat treatment, and CNC grinding—into our in-house production workflow.
We first performed CNC machining on M2 steel in its annealed state (before hardening). This step mainly shaped the blade’s outline, mounting holes, and some preliminary cutting angles.
Immediately after machining, the parts underwent professional vacuum heat treatment to bring the M2 steel to the extremely high hardness required by the customer (typically HRC 60–65). Through precise temperature and time control, we minimized part deformation to the greatest extent.
This was the most critical step. Given the blades’ ultra-high hardness after heat treatment, we used ultra-high-precision CNC grinding machines to perform final precision grinding on the blades’ mating surfaces, positioning surfaces, and—most importantly—cutting edges. This ensured that while the blades maintained extremely high hardness, the straightness and angle tolerance of their cutting edges reached the micron level.
Strict inspections were conducted on the blades’ hardness, geometric dimensions, and the finish and straightness of their cutting edges—ensuring every blade met the highest industry standards.
Through our M2 steel CNC machining and precision grinding services, the customer gained the following core value:
The blades we manufactured combined the exceptional hardness and wear resistance of M2 steel with precision-ground sharp cutting edges, significantly extending the tools’ service life.
We integrated three high-difficulty processes—
CNC machining,
heat treatment, and
CNC grinding—into a single facility. This eliminated quality risks and cumulative errors caused by outsourcing and ensured on-time project delivery.
We implemented strict quality control measures to ensure consistent performance across every blade, meeting the customer’s rigorous requirements for batch product reliability.
With profound experience in difficult-to-machine materials and ultra-precision machining, RPS successfully delivered this critical precision blade to the customer—once again demonstrating our outstanding capability to meet extreme customization needs.
