Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of internal and external cylindrical grinding in China. Please feel free to buy durable internal and external cylindrical grinding made in China here from our factory. All customized products are with high quality and competitive price.
Grinding Capabilities
|
Process Type |
Applications |
Key Features |
|
External Cylindrical Grinding |
Shafts, pins, gear journals, hydraulic rods |
OD finishing to tight tolerances, plunge and traverse grinding methods |
|
Internal Cylindrical Grinding |
Bores, sleeves, bearing housings, gear bores |
Precision ID finishing, high-frequency spindles for small diameters |
|
Centerless Grinding |
High-volume pins, rollers, bushings |
No workholding fixtures - faster throughput for simple cylindrical parts |
|
Diameter Range: Φ5–200mm |
Length Range: up to 200mm |
Process Specifications
|
Parameter |
Value |
|
Equipment |
CNC cylindrical grinding machines, internal grinders, centerless grinders |
|
Diameter Range |
Φ5mm – Φ200mm |
|
Length Range |
Up to 200mm |
|
Grinding Capability |
External (OD) and internal (ID) cylindrical surfaces |
|
Grinding Methods |
Plunge grinding, traverse/oscillation grinding |
|
Materials |
45#, 20# carbon steel; 40Cr, 35CrMo, 20CrMnTi alloy steel; 6061/6063 aluminum; 304 stainless steel; brass |
|
Secondary Operations |
Surface treatment, assembly |
|
Certifications |
IATF 16949, ISO 14001, ISO 45001, IECQ QC080000 |
Performance Highlights
External and internal grinding in one source
We perform both OD and ID cylindrical grinding, eliminating the need for multiple suppliers on round components that require finishing on both surfaces.
Tight tolerances and fine surface finishes
Cylindrical grinding achieves higher accuracy than turning, with excellent roundness and concentricity between internal and external diameters.
Multiple grinding methods
We apply plunge grinding (radial infeed) for short, rigid parts and traverse/oscillation grinding (axial feed) for long components and complex profiles.
Centerless grinding for high-volume, simple OD parts
For pins, rollers, and bushings with uniform diameters, centerless grinding delivers faster throughput without the need for centers or chucks.
Broad material compatibility
Carbon steels, alloy steels, stainless steel, aluminum, and brass are ground with optimized wheel selection - cubic boron nitride (CBN) or aluminum oxide abrasives, and appropriate grit sizes.
IATF 16949-certified facility
Full PPAP Level 3 documentation available - process FMEA, control plans, capability studies.
Quality Control
Applications
Automotive Powertrain Shafts and Gears
Transmission input/output shafts, gear journals, and CV joint components are cylindrical-ground to tight tolerances for reduced friction, noise, and wear in high-volume EV and ICE drivetrains.
Hydraulic and Pneumatic Cylinders
Internal bores and external rods for hydraulic and pneumatic cylinders are ground to precise diameters and surface finishes for reliable sealing and pressure retention.
Bearing Housings and Sleeves
Bearing bores and sleeve IDs are internal-ground to ensure proper fit and concentricity with rotating shafts.
High-Volume Pins, Rollers, and Bushings
Centerless grinding produces simple cylindrical components in large quantities - pins, rollers, and bushings - with consistent OD accuracy and fast cycle times.
Beyond Automotive
|
Sector |
Typical Components |
Key Requirements |
|
Aerospace |
Actuator components, landing gear parts |
Tight tolerances, material traceability |
|
Industrial Equipment |
Hydraulic rods, pump shafts, bearing sleeves |
Surface finish, wear resistance |
|
Medical |
Surgical instruments, implant pins |
Precision, surface finish, clean edges |
|
Energy / Power |
Drive shafts, turbine components |
Concentricity, fatigue resistance |
Why Cylindrical Grinding
For round components that need tight tolerances and fine finishes, other methods have limitations:
Turning – achieves moderate tolerances but leaves tool marks; cannot reach the surface finish of grinding
Milling – unsuitable for cylindrical features; cannot produce consistent roundness
Honing – improves bore finish but removes minimal material; does not correct geometry
Cylindrical grinding delivers the productive finishing capability - tighter tolerances than turning, better surface finish than any cutting process, and concentricity assurance between OD and ID features. For shafts, pins, bores, and bearing surfaces - cylindrical grinding is the finishing method.
Contact Us for Your New Project
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