Kyocera VNBR 051101 KW10 TWE07339 Micro Boring Bar - Micro Boring

Product Overview

The Kyocera VNBR 051101 KW10 Grade Uncoated Carbide Micro Boring Bar is a precision-engineered indexable insert designed for high-accuracy micro-boring operations on CNC turning centers. Manufactured by Kyocera in Japan, this VNB-style insert features an VNBR0511-01 ISO designation with optimized substrate and edge preparation for exceptional surface finish and dimensional stability in demanding production environments.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details - Key Grade Characteristics

KW10 is a premium uncoated fine-grain carbide grade specifically developed by Kyocera for high-precision finishing and light machining operations. Key characteristics include:

• Substrate: Ultra-fine tungsten carbide (WC) grain structure (0.5-0.8 μm) with 12% cobalt binder for optimal hardness and toughness balance
• Hardness: HV 1,850 / HRA 92.5, ensuring excellent wear resistance at moderate cutting speeds
• Transverse Rupture Strength: 2,800 N/mm², providing adequate mechanical shock resistance for interrupted cuts
• Coating: Uncoated (bare substrate) to prevent built-up edge (BUE) on soft, ductile materials and maintain sharp cutting edges
• Edge Preparation: Precision-honed T-land edge with minimal land width to preserve sharpness while preventing chipping
• Color Code: White/silver (uncoated) for easy grade identification in tool cribs

Grade Comparison Matrix

Chipbreaker Profile

NB (No Back-rake) chipbreaker design with neutral cutting geometry for stable machining and reduced vibration in micro-boring operations.

• Chipbreaker Width: Narrow land design optimized for feeds between 0.02-0.15 mm/rev
• Groove Depth: Shallow profile to maintain insert strength while promoting chip curl
• Rake Angle: Neutral (0°) for NB variant to minimize radial forces
• Chip Control: Ideal for short, manageable chip formation in blind-hole boring operations
• Edge Security: Micro-honed edge with 0.004" (0.1mm) corner radius for stable machining and reduced burr formation

Recommended Applications & Workpiece Materials

The VNBR 051101 with KW10 grade excels in the following applications:

• Aluminum Alloys: 1xxx, 2xxx, 5xxx, 6xxx, 7xxx series – prevents built-up edge and delivers mirror finishes
• Copper & Brass: Excellent for electrical connector machining and precision bushing bores
• Plastics & Composites: Clean cutting action without material tearing or delamination
• Magnesium Alloys: Safe for dry machining with reduced ignition risk due to uncoated substrate
• Soft Steels: Low-carbon steels (< 0.25% C) for finish boring where surface quality is paramount
• Titanium Alloys (finish only): Ti-6Al-4V finishing operations at conservative parameters

Application Map by Operation

Recommended Cutting Conditions

Note: Start at the lower end of the parameter range and increase gradually based on tool life and surface finish requirements. Use high-pressure coolant for chip evacuation in deep-hole boring.

Operating Guidelines

• Tool Overhang: Minimize overhang to reduce deflection; use damped boring bars for L/D ratios exceeding 4:1
• Coolant: Flood coolant recommended for aluminum and steel; air blast acceptable for some plastics and magnesium
• Insert Seat Condition: Ensure toolholder seat is clean and undamaged to maintain precise insert positioning
• Clamping Force: Torque clamping screw to manufacturer specification (typically 2.5-3.5 N·m) to prevent micro-vibration
• Edge Inspection: Visually inspect cutting edge before each shift; replace insert at first sign of flank wear exceeding 0.1 mm or chipping
• Runout: Maintain spindle runout below 0.005 mm (0.0002") for optimal bore geometry and surface finish
• Entry/Exit: Use reduced feed rate (50% of normal) when entering and exiting the bore to minimize burr formation

Toolholder Compatibility

The VNBR 051101 insert is compatible with the following Kyocera toolholder families and industry-standard holders:

• Kyocera Series: SVNR, SVNSR, SSVNR (verify holder clearance for NB geometry) style boring bar holders
• Insert Size: Size 05 toolholders with 35° V-type pocket
• Clamping Method: Lever-lock or top-screw clamping (depending on holder design)
• Holder Material: Steel shank or carbide-reinforced bars for enhanced rigidity
• Coolant Through: Select holders with through-coolant capability for deep-hole applications
• Hand: Right-hand (RH) holders standard; left-hand (LH) available on request

Packaging & Ordering Information

Catalog Meta Data

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