SYSTEM STATUS: FDA ACTIVE ISO 13485 Valid MDR Ready
Establishment SinoTitanium
Metals
FEI No. 3033849259
Status Valid
[ISO 13485:2016 VERIFIED] // VDS- PROTOCOL ACTIVE
Precision Protocol: Centerless Ground to h7

Centerless Ground Titanium Bars

The ONLY titanium bar specification for Swiss-type CNC lathes. Eliminates guide bushing vibration, tool chatter, and premature bur failure.

Diameter Range Ø3-32mm
Tolerance h7
Surface Finish Ra 0.4μm
Standard Length 1000mm
Swiss Lathe Mandatory: Standard turned/drawn bars (h11 tolerance, Ra >1.0μm) will cause guide bushing seizure and tool chatter on Swiss lathes. Centerless grinding is NOT optional—it's a functional requirement.

01 Why Centerless Grinding Is Mandatory

❌ Standard Turned Bars (h11)

  • 1.
    Surface Roughness: Ra 1.6-3.2μm Rough surface creates friction with guide bushing ceramic insert, generating heat and accelerated wear.
  • 2.
    Diameter Variation: ±0.05mm (h11) Inconsistent diameter causes harmonic vibration at spindle speeds >3000 RPM. This vibration transmits to cutting tool, causing chatter marks and BUE (Built-Up Edge) formation.
  • 3.
    Ovality/Bow: Up to 0.03mm Bar feeder struggles to push oval rods through collet, causing feeding errors and downtime.

✓ Centerless Ground (h7)

  • 1.
    Surface Finish: Ra 0.4μm Mirror-smooth surface reduces friction coefficient by 70%. Guide bushing life extends from 2,000 to 10,000+ parts.
  • 2.
    Diameter Tolerance: ±0.01mm (h7) Consistent diameter eliminates vibration. Machine runs at full 5000 RPM without chatter. Tool life increases 3x.
  • 3.
    Roundness: <0.005mm Perfect cylindricity ensures smooth bar feeding. Zero unplanned stops. Lights-out manufacturing achievable.

02 The Bushing-Chatter-BUE Failure Cascade

Risk Addressed

Guide Bushing Vibration → Tool Chatter → BUE Formation

In Swiss lathe operations, the rod passes through a precision guide bushing positioned near the cutting tool. Any surface irregularity (Ra >1.0μm) or ovality (>0.01mm) creates harmonic vibration at spindle speeds >3000 RPM. This vibration generates heat at the tool-workpiece interface, accelerating Built-Up Edge (BUE) formation and catastrophic tool failure. Centerless ground rods eliminate this failure mode.

The Cascade Effect

STEP 1: Rough bar surface (Ra 1.6μm) contacts ceramic guide bushing
STEP 2: Friction generates micro-vibration (10-50 Hz)
STEP 3: Vibration transmits to cutting tool → chatter marks on workpiece
STEP 4: Chatter increases cutting temperature → titanium adheres to carbide tool (BUE)
RESULT: Tool failure within 50-100 parts (expected life: 1000+ parts)
Centerless Grinding Process

Fig 1. Centerless Grinding Process - Achieving Ra 0.4μm Surface Finish

03 Technical Specifications

Parameter Specification Test Method
Oxygen (O) Content < 0.10% ~ 0.13% High Toughness; Prevents Fatigue Failure
Iron (Fe) Content < 0.12% ~ 0.25% Superior Biocompatibility & Uniformity
Raw Material Source Grade 0A Virgin Sponge Standard Sponge (Scrap mix) Aerospace Grade Input; Zero Inclusions
Material Ti-6Al-4V ELI (Grade 23) ASTM F136 / ISO 5832-3
Diameter Range Ø3mm to Ø32mm Custom sizes available
Diameter Tolerance h7 (±0.010mm typical) ISO 286-2 Standard
Surface Finish Ra 0.4μm (Average) Surface Roughness Tester
Roundness (Ovality) ≤0.005mm CMM Inspection
Straightness ≤0.5mm per 1000mm length Dial Indicator
Standard Length 1000mm (custom cut available) Bar feeder compatible
Processing Method Centerless Ground + Stress Relieved Internal SOP-TI-CG01

04 Compatible Swiss-Type CNC Lathes

ValidTi centerless ground bars are verified compatible with the following Swiss lathe manufacturers:

Citizen Cincom

A20 / A32 / B12 / L20 series

VERIFIED

Star / Tsugami

SR-20 / SV-20 / SS-20 series

VERIFIED

Tornos

Deco 10 / Deco 20 / Swiss DT series

VERIFIED

Hanwha (Daewoo)

Lynx 2100 / 2500 series

VERIFIED

Tsugami

M08Y / BO series

VERIFIED

Other Swiss Lathes

Any machine with guide bushing

COMPATIBLE

05 Common Diameters for Dental Applications

Ø3-6mm Small Diameter

Screws & Pins

  • • Abutment screws (M1.6 / M2.0)
  • • Prosthetic screws
  • • Surgical pins
  • • Orthodontic mini-implants
Ø8-12mm Medium Diameter

Healing Caps & Copings

  • • Healing abutments
  • • Transfer copings
  • • Temporary abutments
  • • Custom UCLA abutments
Ø15-20mm Large Diameter

Surgical Handles

  • • Surgical instrument handles
  • • Implant driver extensions
  • • Custom tooling components
  • • Fixture mounts
Custom Any Size

Non-Standard Diameters

ValidTi can provide custom diameters from Ø3mm to Ø32mm with h7 tolerance and Ra 0.4μm finish.

MOQ: 50kg per diameter

06 Quality Documentation Included

Every bar shipment includes the following traceability documents:

Material Test Report (MTR)

Chemical composition and mechanical properties certified per ASTM F136. Heat number traceable to original mill.

Dimensional Inspection Report

CMM verification of diameter (h7), roundness (≤0.005mm), and straightness (≤0.5mm/1000mm) per batch.

Surface Finish Report

Surface roughness measurement (Ra 0.4μm typical) verified with profilometer. Random sampling per ISO 4287.

VIEW SAMPLE REPORTS

Request Centerless Ground Bars Quote

Specify diameter, quantity, and length. Custom sizes available (MOQ: 50kg). Lead time: 4-6 weeks for custom diameters.

REQUEST QUOTE TORNOS COMPATIBILITY →

All bars ship with MTR + Dimensional Report + Surface Finish Report. ISO 13485 certified manufacturing.