10.6 мм Свердла довгі кобальтові по металу DIN 340 RN HSSCo

Long Series Straight Shank Drills DIN 340 RN HSSCo

DIN 340 long series straight shank drills in RN execution are made from cobalt-alloyed high-speed steel (HSSCo). Their extended length provides additional reach for drilling metal components, while the cobalt-alloyed material improves resistance to softening at elevated cutting temperatures.

Applications:

Used for drilling through holes and blind holes, accessing recessed surfaces and machining parts where jobber-length drills provide insufficient reach. Suitable applications include steel and stainless steel within the manufacturer’s recommended range. Material compatibility depends on workpiece hardness, drill geometry and machining conditions.

Operating Principle:

The rotating cutting edges remove material while the spiral flutes carry chips away from the cutting zone. HSSCo helps retain cutting edge hardness at elevated temperatures. The extended tool length requires accurate alignment and controlled feed to limit deflection and maintain the drilling direction.

Diameter and Length:

The drill diameter determines the nominal hole size. Overall length and flute length vary with the selected size. The long series design increases reach, but usable drilling depth also depends on chip evacuation, cooling, clamping and setup rigidity.

Cutting Material:

HSSCo contains cobalt as an alloying element throughout the steel rather than as a surface coating. The exact cobalt content depends on the selected product. Increased hot hardness supports demanding drilling conditions, while suitable cutting speeds and lubrication remain necessary.

Tool Geometry:

DIN 340 specifies the dimensional series for long twist drills with straight shanks. RN identifies the tool execution. Point angle, helix angle, point grinding and any surface treatment should be checked in the specifications of the selected drill.

Practical Recommendations:

Secure the workpiece and clamp the shank with the minimum overhang needed for access. Check spindle runout and, where necessary, prepare a suitable starting hole with a compatible shorter drill. Maintain a steady axial feed, apply suitable cutting fluid and use an appropriate withdrawal cycle to prevent chip packing. When drilling stainless steel, avoid prolonged rubbing without effective cutting.

Specifications:

• Tool type: cobalt-alloyed twist drill for metal
• Series: long
• Standard: DIN 340
• Execution: RN
• Shank type: straight
• Tool material: cobalt-alloyed high-speed steel (HSSCo)
• Diameter: depends on the selected size
• Overall length: depends on the selected size
• Flute length: depends on the selected size

Cutting Characteristics:

HSSCo provides increased resistance to heat-related softening compared with conventional HSS. The long design remains sensitive to bending and vibration, making stable guidance and effective chip removal essential.

Cutting Parameters:

Select spindle speed and feed according to drill diameter, HSSCo grade, workpiece material and hardness, hole depth and cooling conditions. Follow the manufacturer’s cutting data and adjust the drilling cycle for the available setup rigidity and chip evacuation.

Suitable Operations:

• Drilling metal components requiring additional reach
• Accessing recessed drilling locations
• Machining steel and stainless steel within the recommended range
• Producing through holes and blind holes within the tool’s working capacity

Limitations:

HSSCo does not establish suitability for every hardened steel or heat-resistant alloy. Extended length increases sensitivity to lateral loads and misalignment. Flute length alone does not determine maximum drilling depth. Deep holes or tight tolerances may require additional guidance, specialised tooling or a subsequent finishing operation.