Overview
This document provides technical specifications and guidelines for using reamers in machining hardened steel and high-speed steel (HSS) with hardness ranging from 55 to 68 HRC. It includes detailed information on cutting parameters, tool specifications, and performance benefits.

Specifications

• Workpiece Material: Steel and HSS
• Hardness: 55-68 HRC
• Speed: 18-120 m/min
• Feed: 0.10 mm/rev
• Working Allowance: 0.20-0.40 mm
• Coolant Pressure: ≥ 3 bar

Tool Types and Dimensions

• Reamers are available in various diameters ranging from 12 mm to 50 mm, with specific tolerances and lengths provided for each size.
• Reamers are categorized into types RD, RA, and RB, each suited for different hole types (through and blind holes).

Performance and Benefits

• Reaming in hardened steel can replace internal grinding, offering improved geometry and surface finish.
• Significant time savings of up to 90% can be achieved, as demonstrated in a case study where machining time was reduced from 26 minutes to 2 minutes and 20 seconds.
• Surface finish improved from 0.6 to 0.2 Ra, with roundness at 4µ.

Adjustability and Customization

• Standard sizes are preset to +0.008 mm from the minimum diameter tolerance H7.
• Reamers can be adjusted to increase the tolerance band or for fine adjustments within a certain tolerance.
• Intermediate diameters can be manufactured and preset to specific requirements.

Insert Selection and Coatings

• Uncoated inserts are suitable for non-ferrous alloys requiring a sharp cutting edge.
• TiN coated inserts offer high cutting data and long tool life but are not suitable for aluminum.
• Cermet inserts are recommended for steel and grey cast iron, providing high cutting speed and wear resistance.

Cutting Data for Various Materials

• Detailed cutting data is provided for different materials, including steel, cast iron, stainless steel, Inconel, aluminum, bronze, brass, copper, and plastic.
• Parameters such as feed rate, speed, and coolant supply are specified for each material type.

Spare Parts and Accessories

• Spare parts for reamers include eccentric screws, adjusting screws, wedges, pivots, and hexagon keys.
• Specific part numbers and ranges are provided for easy identification and replacement.

Recommendations

• Use emulsion with a minimum 6% concentration for optimal performance.
• Consider the working allowance and adjust reamer settings accordingly for different materials.