Internal – External Cylindrical Grinding

Internal – External Cylindrical Grinding is a composite process that simultaneously covers the finishing of both internal bores (inner circles) and outer cylindrical surfaces. By integrating specialized grinding wheels with high-precision control systems, it enables simultaneous dimensional control of both internal and external features on shafts, sleeves, mating surfaces, and similar components. This technology finds extensive application in industries such as hydraulic components, transmission systems, precision instruments, and energy equipment.

Core Process Features

1. Dual-Dimension Simultaneous Machining

External Grinding: Cuts the workpiece’s external cylindrical surface via rotating grinding wheels to correct roundness, cylindricity, and surface roughness.
Internal Grinding: Employs miniature grinding wheels inserted into workpiece bores to complete ID, taper, and end-face machining—particularly adept at precision forming of deep holes and small bores (≥3mm).
Combined Advantage: Eliminates positioning errors from multiple setups, ensuring coaxiality between inner and outer circles ≤0.005mm, significantly enhancing assembly precision.

2. High Precision

CNC systems support complex contour programming with automatic compensation for grinding wheel wear and thermal deformation.
Online measurement devices provide real-time dimensional feedback, dynamically adjusting grinding parameters for closed-loop quality control.

Application Fields and Typical Workpieces

Hydraulic Transmission: Simultaneous precision finishing of bore and outer diameter for hydraulic pump cylinders, valve sleeves, and piston bores to ensure sealing integrity and pressure resistance.
Energy Equipment: Bore finishing and outer diameter strengthening for wind turbine spindles and gas turbine bearing sleeves, extending service life under extreme conditions.
Precision Machinery: IT5 tolerance control for machine tool spindles and encoder shaft sleeves, meeting dynamic balancing requirements during high-speed rotation.
Medical Devices: Super-finishing of artificial joint stem inner bores and outer cylindrical surfaces balances biocompatibility with surgical implantation precision.