Overview

This document provides detailed technical specifications, performance data, and application guidelines for the MSBH230 and MRBH230 series of cutting tools. These ball end mills are specifically engineered for machining hardened steels with hardness ranging from 48 to 65 HRC. They incorporate the advanced Mugen Coating Premium, a high-hardness coating that enhances tool life and machining stability.

1. Specifications and Features

• Tool Types: MRBH230 (Long Neck Ball Hard) and MSBH230 ball end mills, both featuring a 2-flute design.
• Material: Micro Grain Carbide substrate coated with Mugen Coating Premium.
• Coating Characteristics: Hardness of 3600 HV and oxidation onset temperature of 1300°C, surpassing conventional coatings like TiAlN, TiCN, and TiN.
• Design Innovations: Unique R-shaped cutting edges (radii from 0.05 mm to 0.25 mm) and back taper on peripheral cutting edges to reduce chatter and tool deflection.
• Size Range: Extensive selection with 157 standardized sizes, including newly introduced small radius sizes for precision machining.

2. Performance and Benefits

• Extended Tool Life: Mugen Coating Premium significantly improves durability and stability when machining hardened steels (48-65 HRC) compared to conventional coatings.
• Superior Surface Finish: The R-shaped edges and coating reduce chipping and vibration, achieving surface roughness around 0.6-0.7 μm Rz on plane surfaces.
• Minimized Chatter and Deflection: Back taper design and sharper cutting edges reduce vibration during side milling, enabling wall deflection as low as 0.001 mm for improved accuracy.
• Stable Cutting Conditions: Suitable for both roughing and finishing with optimized cutting parameters; oil mist coolant is recommended to enhance performance.

3. Machining Conditions and Examples

• Cutting Parameters: Typical spindle speeds range from 12,000 to 25,000 min⁻¹; feed rates from 300 to 2,500 mm/min; depths of cut vary by operation type.
• Coolant: Oil mist coolant is consistently advised to improve tool life and surface quality.
• Applicable Materials: Powdered high-speed steels (HAP40, SKD11, SKD61), STAVAX stainless steel, and other hardened steels up to 65 HRC.
• Application Examples: Die cutting, punching, and cavity machining demonstrate enhanced tool life and surface finish using Mugen Coating Premium tools.

4. Comparative Data and Tool Life

• Comparative testing shows MRBH230 tools with Mugen Coating Premium outperform competitor tools in tool life and wear resistance across various hardened steel grades.
• Wear measurements confirm sustained cutting capability beyond 300 meters with significantly lower wear rates.
• Tool life benchmarks set Mugen Coating Premium at 100, indicating superior durability in press mold, die-casting, and plastic mold applications.

5. Ordering Information and Dimensions

• Ordering requires specifying model (MRBH230 or MSBH230), radius (R), and effective cutting length (ℓ1).
• Dimensional tables include overall length, cutting length, shank diameter, neck taper angle (~12°), neck diameter, and radius options.
• Effective cutting length varies with workpiece inclination angle; reference values are provided for angles from 30' to 3°.
• Prices are listed in Japanese Yen, with a broad range of sizes and radii to accommodate diverse machining needs.

6. Recommendations and Best Practices

• Use oil mist coolant to maximize tool life and surface finish quality.
• Follow recommended cutting parameters for roughing and finishing to balance productivity and tool durability.
• Leverage the specialized R-shaped cutting edges and back taper design to minimize chatter and improve machining accuracy, especially for hardened steels.
• Select tool size and radius based on workpiece geometry and machining requirements.

Additional Sections

Product Overview

The MSBH230 series includes 16 sizes with radii from 0.05 mm to 4 mm and shank diameters up to 6 mm, including newly standardized small radius sizes and a 4 mm shank type for R2. The tools are optimized for finishing hardened steels up to 65 HRC.

Cutting Conditions and Recommendations

• Detailed tables provide feed rates, spindle speeds, and depths of cut tailored to different materials and tool sizes.
• Depth of cut is specified axially (Ad) and radially (Rd).
• Minimize tool overhang to maintain rigidity and accuracy.
• Adjust parameters based on material hardness and machine rigidity.

Safety Instructions

• Handle tools carefully to avoid injury from sharp edges.
• Use protective covers and eye protection during handling and machining.
• Ensure tools are securely mounted to prevent vibration.
• Clamp workpieces firmly before machining.
• Verify dimensions before operation.
• Use appropriate cutting fluids and avoid fire hazards.
• Stop machine immediately if abnormal conditions occur.
• Do not modify tools.

Ordering Information

Specify model MSBH230 followed by radius (R) and shank diameter (d). Neck taper angle is a reference value.

Additional Notes

• Specifications may change without notice for product improvement.
• Catalog printed with environmentally friendly soybean-based ink.
• Customer support available via sales offices in Tokyo, Osaka, Sendai, Nagoya, and Nagano.

Summary

The MSBH230 and MRBH230 series with Mugen Coating Premium offer advanced solutions for machining hardened steels up to 65 HRC. Their innovative coating and design features provide superior tool life, reduced vibration, and improved surface finish. Comprehensive size options and detailed ordering information support versatile applications in die casting, plastic mold, and press mold industries. Adhering to recommended machining conditions and coolant use ensures optimal performance, safety, and cost efficiency.