Gear grinding center YS7232G/YS7232H/YS7232A/YS7230

rotating tableCNCautomated loading/unloading

Overview
The machine is designed for precision grinding of electric vehicle gears and meets stringent acceptance criteria: profile/lead slope deviation mean ±0.002 mm, profile/lead ripple ≤0.0018 mm, gear surface roughness Ra ≤0.32 μm.

Main performance and features

• Eleven-axis, five‑linkage CNC gear grinding machine developed following high-end European precision machine tool processes in cooperation with PTG (HOLROYD) UK and Chongqing Machine Tool.
• Grinding wheel spindle uses high-power, high-speed, high-precision integral electro-spindle with matched high-precision European bearings.
• Linear axes employ original European preloaded high‑precision ball screw pairs and high-rigidity rolling linear guides with Heidenhain linear scales for full closed-loop control to improve rigidity and dynamic response.
• Control with Siemens 840Dsl/one or FANUC 31l; multi-channel platform enables flexible control of eleven CNC axes and full automation including automatic workpiece clamping, automatic wheel dressing, high-speed indexing, automatic grinding teach, automatic dressing teach, automatic allowance distribution and fully automatic grinding processes.
• Operator interface features a zero-programming HMI developed in-house for parameter dialogue, gear calculations and automatic generation of grinding and wheel-dressing programs.
• Machine software supports complex corrections and grinding modes: arbitrary lead modifications, face twist compensation, point dressing, patterned surface grinding, asymmetric double-pressure-angle gears, small-cone/taper gear grinding, etc.

Main technical specifications (by model)

• Models: YS7232G / YS7232H / YS7232A / YS7230
• Control system: Siemens 840Dsl/one / Siemens 840Dsl/one / Siemens 840Dsl/one / FANUC 31l
• Maximum workpiece diameter: 320 / 320 / 320 / 320 mm
• Maximum module: 6 / 8 / 6 / 6 mm
• Grinding spindle max speed (r/min): 10000 / 7800 / 12000 / 7800
• Workpiece spindle max speed (r/min): 2000 / 1000 / 2000 / 1000
• Wheel center to table rotation center distance: 50–440 mm
• Wheel mounting dimensions (mm): Φ280×Φ115×160 / Φ300×Φ115×160 / Φ240×Φ76.2×200 / Φ280×Φ115×160
• Roller maximum mounting size (example): Φ140×Φ52×40 / Φ140×Φ52×40 / Φ150×Φ52×40 / Φ140×Φ52×40
• Electro-spindle power (kW): 29 / 38 / 28.5 / 38

Applications and technical highlights

• Intended workpieces: precision grinding of electric vehicle gears
• Achieved processing accuracy: profile/lead slope deviation mean ±0.002 mm; profile/lead ripple ≤0.0018 mm; surface roughness Ra ≤0.32 μm
• Numerical control axes: eleven axes with five‑linkage motion
• Automation: automatic clamping, wheel dressing, high-speed indexing, automatic teach and allowance distribution
• Advanced grinding capabilities: arbitrary lead shaping, face twist compensation, point dressing, patterned grinding, asymmetric tooth grinding, small-cone gear grinding