Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of internal spline broaching in China. Please feel free to buy durable internal spline broaching made in China here from our factory. All customized products are with high quality and competitive price.
Broaching Capabilities
|
Process Type |
Applications |
Key Features |
|
Internal Spline Broaching |
Involute, straight, and helical splines in gears, hubs, couplings |
Single-pass finishing, ±0.01mm accuracy, consistent tooth geometry across production runs |
|
Keyway Broaching |
Internal keyways in bores and hubs |
Pull broaching through starter holes for continuous keyways |
|
Blind-Hole Broaching |
Splines and keyways in blind bores |
Specialized tooling with chip relief - a capability few shops offer |
|
Rotary Broaching |
Small splines, hex forms, serrations (up to ~50mm) |
On lathes/mills, single-point shaping of polygonal profiles |
|
Diameter Range: Φ5–100mm |
Length Range: 10–100mm |
Spline Accuracy: ±0.01mm, Pitch Error ≤0.015mm |
Process Specifications
|
Parameter |
Value |
|
Equipment |
Vertical broaching machines with rigid stroke control |
|
Diameter Range |
Φ5mm – Φ100mm |
|
Length Range |
10mm – 100mm |
|
Spline Accuracy |
±0.01mm |
|
Pitch Error |
≤0.015mm |
|
Materials |
45#, 20# carbon steel; 40Cr, 35CrMo, 20CrMnTi alloy steel; 6061/6063 aluminum; 304 stainless steel; brass |
|
Certifications |
IATF 16949, ISO 14001, ISO 45001, IECQ QC080000 |
Performance Highlights
Single-pass production
Broaching completes roughing, semi-finishing, and finishing in one stroke. Progressive tooth geometry removes material incrementally - faster than milling or shaping, with consistent tooth form and surface finish.
Spline accuracy ±0.01mm
The rigid machine structure and controlled cutting motion deliver accurate tooth form, depth, and spacing, ensuring uniform load distribution across the spline. Pitch error held to ≤0.015mm.
Multiple profile capability
We broach involute splines (for torque transmission in gears and couplings), parallel key splines, serration splines, and custom internal profiles - with tooling designed to match each specification.
Blind-hole broaching expertise
Unlike linear pull broaching, which requires through-holes, blind-hole broaching uses specialized tooling with chip relief - a capability few shops can perform accurately.
Broad material compatibility
Broaching works effectively on steel alloys, aluminum, brass, and bronze. We process carbon steels, alloy steels, stainless steel, aluminum alloys, and brass with optimized tooling and cutting parameters for each material.
IATF 16949-certified facility
Full PPAP Level 3 documentation available - process FMEA, control plans, capability studies - prepared to the same standard we apply to Tier 1 automotive customers.
Quality Control
Applications
Automotive Differential and Transmission Components
Internal splines in differential gears (planetary gears and half-shaft gears) are broached with ±0.01mm accuracy, ensuring consistent torque transmission and component alignment. Used extensively in hybrid and electric drivetrains.
Hubs, Couplings, and Drive Systems
Internal splines in hubs and coupling assemblies are broached for reliable power transmission, with uniform tooth spacing and accurate centering of mating components.
Keyways in Shafts and Gears
Internal keyways in bores and hubs are broached using pull broaching through starter holes - delivering precise keyway width, depth, and alignment.
Specialized and Blind-Hole Components
Custom spline profiles and blind-hole features are broached for low-volume and prototype applications requiring specialized tooling geometry.
Beyond Automotive
|
Sector |
Typical Components |
Key Requirements |
|
Aerospace |
Splined shafts, gearbox components |
Tight tolerances, material traceability, ±0.01mm accuracy |
|
Industrial Equipment |
Hydraulic couplings, splined hubs |
Torque transmission, wear resistance, high-volume consistency |
|
Energy / Wind Power |
Coupling components, drive shafts |
High torque capacity, precise tooth geometry, reliability |
|
Medical |
Surgical instruments, implant components |
Precision, surface finish, clean edges |
Why Internal Spline Broaching
For internal splines and keyways, other methods have limitations:
Milling – unsuitable for internal features where the tool cannot access the bore
EDM – slow, costly, and not practical for production volumes
Rotary broaching – limited to small diameters and shallow depths (~1.5× diameter)
Internal spline broaching delivers the productive middle ground - faster than EDM or shaping, more accurate than rotary broaching, and capable of producing consistent internal spline geometry across high-volume runs. For differential gears, hubs, couplings, and keyways - internal spline broaching is the production method.
Contact Us for Your New Project
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