CNC Ball Screw External Thread Grinding Solution

What is Ball Screw

Usage: Ball screw/trapezoidal screw is the core transmission component of machine tools, robot joints, and linear modules, which directly affects the accuracy and life of equipment.
Materials: Commonly used stainless steel, superalloys, titanium alloys and other difficult-to-machine materials.
Geometric characteristics: complex thread cross-section (such as ball raceway arc type), high lead accuracy requirements (±0.005mm), and wide spiral lift angle.
Common risks: Machining deformation, substandard surface roughness, clogged cooling holes, and grinding wheel wear leading to precision drift.

Ball Screw External Thread Grinding Core Pain Point

There are three major problems in traditional thread grinders: (1) Insufficient accuracy (Ra≥0.8μm) leads to a scrap rate of up to 10%+; (2) Manual correction of the grinding wheel takes a long time (15-20 minutes each time) and has low efficiency; (3) It is troublesome to switch between multiple types of threads, and it cannot adapt to the needs of small batch customization. These problems directly increase production costs (20%+ loss per batch) and extend lead times (5-7 days delay).

Ball Screw External Thread Grinding Process

Blank → coarse grinding→ semi-fine grinding→ fine grinding→ surface treatment→ testing
Key points of the sub-link

• Threaded raceway grinding:

• The C-Z axis is adopted, and the grinding wheel is fed along the workpiece axis while the workpiece rotates synchronously according to the lead.
• Divided into 3 rounds: coarse grinding (feed 0.01mm), →semi-fine grinding (0.005mm), → fine grinding (≤0.002mm);
• Key equipment: GS100 comes with Taiwan Rongcheng Electric spindle (speed 0-4500r/min) + British Renishaw encoder.

• Grinding wheel correction:

• Automatic correction of the diamond roller (Jiangsu Xingchen trimmer spindle, speed 10000r/min);
• Programmable modification of any section, and the grinding wheel contour removal amount is automatically compensated to avoid accuracy loss.

• Testing link:

• Position detection device at the starting point of part processing + closed-loop control;
• Raster scale (Spanish Fagrid) provides real-time feedback on the X/Z axis position, ensuring a tolerance ± 0.005mm.

Ball Screw External Thread Grinding Earnings Data

Indicators	Traditional Equipment	GS100
Surface Roughness (Ra)	≥0.8μm	≤0.32μm
Defect Rate	≥10%	≤3%
Processing Efficiency	10 pcs/day	12.5 pcs/day (↑25%)
Wheel Dressing Time	15 min/time	5 min/time (↓67%)
Delivery Cycle	7 days/batch	5.95 days/batch (↓15%)

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