Iwaki, Japan – April, 2026 – Tungaloy Corporation (President: Satoshi Kinoshita, Head Office: 11-1 Yoshima Kogyodanchi, Iwaki City, Fukushima Prefecture) announces the expansion of its SBN30 solid CBN series for high-speed cast iron machining with the addition of 14 new insert lineups, enabling a broader range of applications.
Challenges and Trends
In automotive parts, particularly in components such as brake discs, flywheels, and cast iron gear cases, there is an increasing demand for high-speed machining to improve production efficiency. However, when using commonly employed carbide or ceramic tools, increasing the cutting speed often leads to a significant reduction in tool life, making stable machining difficult. In addition, brazed CBN tools tend to experience edge chipping under severe cutting conditions, raising concerns about reliability. As a result, the market is seeking tool materials that combine higher heat resistance with greater reliability, and there is increasing anticipation for new solutions that can achieve both high-speed machining and long tool life.
Product Overview
The SBN30 is a high-hardness CBN insert suitable for high-speed and deep cutting of cast iron. The entire chip is made of a CBN sintered body, providing excellent wear and chipping resistance. With optimized CBN grain size and a dedicated binder, it enables stable, long tool life performance in both interrupted and continuous cutting operations.
Benefits and Features
Feature 1: Expanded lineup for a wide range of cast iron machining
– In addition to the existing 10 items, 14 new items—such as T-shaped, D-shaped, and different corner radii—have been added.
– Enables optimal selection for various machining geometries and conditions, providing greater flexibility in process design.
– Significantly expands the applicable range in high-speed machining of cast iron.
Feature 2: High-efficiency and stable machining with solid CBN inserts
– The entire insert is made of sintered CBN, allowing deep cutting and high-feed machining.
– Achieves higher cutting speeds compared to ceramic or carbide tools, improving productivity.
– Excellent wear resistance ensures long tool life and stable machining quality.
Feature 3: Cost-effective multi-corner design
– Unlike brazed types, the multi-corner design allows more usable edges, maximizing tool life.
– Reduces cost per corner and contributes to overall machining cost reduction.
– Combines high-efficiency machining with low-cost operation, maximizing benefits in mass production lines.
Success Stories
Excellent machined surface quality
Chipping occurred after 200 workpieces when using a competitor’s product, resulting in a deteriorated surface finish. In contrast, SBN30, with its excellent fracture resistance, showed no chipping and maintained a good surface finish, thereby contributing to improved quality.
| Industry | Automotive |
| Component | Brake Drum |
| Material ISO code |  K – Cast iron |
| Work material | FC200 |
| Machine(Spindletype) | CNC Lathe |
| Tool family | Turning |
| Toolcategory | External turning |
| Product name | SBN30 |
| TSR No. | 5411T |
