Kyocera VNBR0730-003NB KW10 TWE07098 Boring Bar - Micro Boring
- Stock: In Stock
- Model: VNBR
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: TWE07098
Kyocera VNBR 0730003NB KW10 Grade Uncoated Carbide, Micro Boring Bar
Product Overview
The Kyocera VNBR0730-003NB KW10 Grade Uncoated Carbide Micro Boring Bar is engineered for micro boring operations requiring exceptional dimensional accuracy and surface finish quality. Manufactured by Kyocera in Japan, this precision insert combines an ultra-fine grain carbide substrate with optimized cutting geometry to deliver consistent performance in high-volume production environments. The KW10 grade substrate provides superior edge sharpness and wear resistance for finishing operations where minimal cutting forces and thermal stability are critical.
ISO Designation Breakdown
The VNBR0730-003NB designation follows ISO 1832 standard nomenclature for indexable inserts. Each alphanumeric position conveys specific geometric and functional characteristics:
| ISO Designation Analysis | |
|---|---|
| Insert Shape | – 35° Rhombic (V-type) |
| Clearance Angle | N – 0° (Neutral) |
| Tolerance Class | G – Precision tolerance (±0.025mm) |
| Fixing Type | R – Hole and countersink |
| Insert Size | 07 mm inscribed circle |
| Thickness | 30 mm nominal thickness |
Understanding this coding system ensures correct insert selection for your specific toolholder and machining application.
Engineering Dimensions & Geometry
Precision-engineered cutting geometry verified to ISO 1832 tolerances:
| Geometry, Cutting Angles & Dimensions | |
|---|---|
| Nose Angle | 35° |
| Relief Angle | 11° |
| Inscribed Circle (IC) | 07 mm |
| Insert Thickness | 30 mm |
Grade Details - Key Grade Characteristics
The KW10 grade represents Kyocera's premium uncoated micro-grain carbide formulation specifically developed for precision finishing applications:
- Substrate: Ultra-fine tungsten carbide grain structure (0.5–0.8 μm) with 10% cobalt binder
- Hardness: 92.0 HRA (1580 HV30) providing excellent wear resistance and edge stability
- Transverse Rupture Strength: 3,200 MPa – optimized for interrupted cuts and micro-machining
- Thermal Conductivity: 84 W/m·K – efficient heat dissipation from the cutting edge
- Oxidation Resistance: Stable up to 600°C in dry cutting conditions
- Surface Finish Capability: Ra 0.2–0.4 μm achievable under optimal conditions
Grade Comparison Matrix
Select the optimal grade for your specific machining requirements by comparing key performance parameters:
| Grade | Coating | Application | Workpiece Material |
|---|---|---|---|
| KW10 | Uncoated | Micro finishing, high precision | Steel, SS, Cast Iron, Non-ferrous |
| KW20 | Uncoated | General purpose turning | Steel, Cast Iron |
| PR930 | PVD Coated | Semi-finishing to roughing | Steel, Stainless Steel |
| CA530 | CVD Coated | Heavy roughing | Cast Iron, Steel |
Chipbreaker Profile
Precision-ground micro-chipbreaker with positive rake geometry designed for small-diameter internal boring. Optimized for continuous cutting with minimal vibration and superior surface finish generation.
| Chipbreaker Specifications | |
|---|---|
| Profile Type | Positive rake with micro-groove |
| Rake Angle (γ) | +15° to +20° |
| Chip Groove Depth | 0.05–0.10 mm |
| Land Width | 0.10–0.15 mm (T-land) |
| Chip Control Range | f = 0.05–0.20 mm/rev |
Recommended Applications & Workpiece Materials
The VNBR0730-003NB with KW10 grade is optimized for machining the following material groups:
- Steels: Carbon steels (AISI 1045), alloy steels (4140), stainless steels (304, 316), cast iron (GG25), and aluminum alloys
- Stainless Steels: Austenitic 300-series (304, 316, 321) and duplex grades
- Cast Irons: Gray cast iron (GG20–GG30), nodular iron (GGG40–GGG60)
- Non-Ferrous: Aluminum alloys (6061, 7075), copper, brass, and bronze
- Superalloys: Limited application in nickel-based alloys at reduced cutting speeds
Not recommended for: Hardened steels above 45 HRC, titanium alloys (Ti-6Al-4V), or heavy interrupted cutting of abrasive materials.
Application Map by Operation
Operational suitability matrix for the VNBR0730-003NB insert configuration:
| Operation Type | Suitability | Recommended Conditions |
|---|---|---|
| Micro Boring | Primary | Vc 150–250 m/min, f 0.05–0.15 mm/rev |
| External Turning | Conditional | Light finishing passes only |
| Facing | Not Recommended | N/A |
| Profiling | Conditional | Low DOC, high precision setup |
Recommended Cutting Conditions
Parameters below represent starting values for stable machining with flood coolant or minimum quantity lubrication (MQL). Adjust based on machine rigidity, workpiece clamping, and desired surface finish:
| Workpiece Material | Cutting Speed Vc (m/min) | Feed f (mm/rev) | Depth of Cut ap (mm) |
|---|---|---|---|
| Low-Carbon Steel (C<0.25%) | 180–250 | 0.05–0.12 | 0.1–0.5 |
| Medium-Carbon Steel (0.25–0.55%) | 150–220 | 0.05–0.10 | 0.1–0.4 |
| Austenitic Stainless Steel | 120–180 | 0.05–0.10 | 0.1–0.3 |
| Gray Cast Iron (HB 180–220) | 150–200 | 0.08–0.15 | 0.2–0.6 |
| Aluminum Alloy (Si<10%) | 300–500 | 0.05–0.15 | 0.1–0.5 |
Notes: For dry machining, reduce cutting speed by 15–20%. For internal operations, reduce Vc by 10–15% due to chip evacuation constraints. Always use sharp inserts for finishing – regrind or replace when flank wear exceeds 0.10 mm.
Operating Guidelines
- Tool Setup: Ensure insert seating surface is clean and free of debris. Torque clamping screw to 2.5–3.0 N·m for secure fixation.
- Runout Tolerance: Maintain toolholder runout below 0.01 mm TIR at the cutting edge for optimal finish and insert life.
- Coolant Strategy: High-pressure coolant (70+ bar) directed at the cutting edge is recommended for chip evacuation in deep boring and grooving operations.
- Edge Preparation: The KW10 grade features a honed T-land edge (0.02–0.05 mm). Do not attempt to re-hone – replace insert when edge deterioration is visible.
- Depth of Cut: For micro-machining, maintain ap ≤ 0.5 × corner radius to prevent burr formation and ensure dimensional stability.
- Surface Finish Optimization: Use highest possible cutting speed within recommended range and lowest stable feed rate. Increase nose radius if geometric constraints allow.
Toolholder Compatibility
The VNBR0730-003NB insert is designed for use with the following Kyocera and industry-standard toolholder families:
- Compatible Holders: Standard VN series toolholders and boring bars
- Clamping System: Top-clamp or lever-lock depending on holder design
- Insert Orientation: Right-hand (right-hand) configuration
- Holder Material: Alloy steel body with hardened pocket (45–50 HRC)
- Replacement Parts: Use Kyocera OEM clamping screws and cartridges to maintain precision
For custom toolholder configurations or Swiss-type machine adapters, contact Kyocera technical support with your machine spindle and turret specifications.
Packaging & Ordering Information
| Product Identity & Part Numbers | |
|---|---|
| Manufacturer | Kyocera Precision Tools |
| Manufacturer Part Number | TWE07098 |
| ISO Part Number | VNBR0730-003NB |
| ANSI Part Number | VNBR0730003NBKW10 |
| Packaging Quantity | 1 insert per pack (industrial packaging) |
| Country of Origin | Japan |
| Warranty | Full manufacturer warranty against material and manufacturing defects |
Catalog Meta Data
| Catalog Meta Data | |
|---|---|
| Catalog Series | |
| Insert Style Code | |
| Product Group | Micro Machining Inserts |
| Industry Sector | Precision Engineering, Medical, Aerospace, Automotive |
| ECCN Classification | EAR99 |
| Harmonized Code | 8209.00.00 |
Why Buy from Kyotow.com?
- Genuine OEM industrial cutting tools with full traceability
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- Expert CNC tooling application support and technical assistance
- Bulk and institutional orders welcome with volume pricing
