What is High Precision Ball Screw
Usage: Planetary ball screws are the core transmission components in industrial automation, heavy-duty robots, high-end machine tools, etc., responsible for converting rotational motion into high-precision linear motion, requiring extremely high positioning accuracy and load-bearing capacity.
Material/geometric features: Manufactured from high-strength alloy steel, with complex thread tooth shapes (arc/trapezoidal), it needs to meet the requirements of micron-level accuracy (spiral error ≤ 0.005mm) and compatibility of thin-walled/deep cavity structures.
Common risks: traditional processes are prone to thread deformation, surface burns, spiral accuracy and other problems; Moreover, the switching of multiple types of thread processing is cumbersome, and the equipment adaptability is poor, resulting in low production efficiency.
High Precision External Grinding Core Pain Point
Pain point 1: The accuracy of the traditional grinder is insufficient, and the thread spiral error exceeds 0.01mm
- Efficiency: 25% longer production cycle time (1.5 hours more per lead screw)
- Cost: The cost of rework increases by 120 yuan/root
- Quality: Scrap rate up to 18%
Pain point 2: Multi-type thread processing is cumbersome to switch, and equipment adaptability is poor
- Efficiency: 1.5 hours/time changeover time, 8 hours of lost capacity per month
- Cost: Additional tooling/tooling costs increase by 5,000 yuan per month
- Quality: 12% defective rate of the first article after switching
Pain point 3: The surface roughness is not up to standard, which affects the service life of the lead screw
- Efficiency: Additional polishing process is required, adding 30 minutes/piece
- Cost: Polishing labor cost is 50 yuan/piece
- Quality: 10% increase in customer complaint rate
High Precision External Grinding Process
CGK-500 runs through the whole link of planetary ball screw processing: blank preparation→ rough grinding (CGK-500 core link), → fine grinding (CGK-500 core link), →surface treatment→ quality inspection.
- Coarse grinding: removing most of the allowance to lay the foundation for fine grinding;
- Fine Grinding: High-precision thread forming through closed-loop control;
- All links are connected to the CNC control system that relies on CGK-500 to ensure seamless parameter switching and improve overall production stability.
Coarse grinding link
- Specific method: Adopt a high-efficiency grinding process to remove the allowance along the thread tooth trajectory;
- Parameter range: workpiece speed 20-40r/min, grinding wheel frame advance and retreat speed 3-5m/min, cutting depth 0.05-0.1mm;
- Risk and control: avoid workpiece deformation → use center frame support to control the grinding temperature (cooling of the cutting fluid);
- Key equipment: CGK-500 grinding machine (Siemens 828D CNC system), magnetic separator filtration system.
Fine grinding link
- Specific method: finely adjust the grinding wheel trajectory to ensure the accuracy of the thread spiral;
- Parameter range: workpiece speed 10-20r/min, dresser feed speed 0.1-0.3m/min, cutting depth 0.005-0.01mm;
- Risk and control: prevent surface burns→ high-pressure cooling system (flow ≥ 15L/min), use of diamond grinding wheels;
- Key equipment: CGK-500 grinder (Heidenhain grating ruler closed-loop control), Tongfei spindle oil cooler.
Quality inspection link
- Specific method: use a coordinate measuring instrument to detect the accuracy and surface roughness of the spiral;
- Parameter range: spiral accuracy detection range 2π radians/300mm, roughness sampling interval 0.5mm;
- Risk and control: reduce detection errors → calibrate instruments regularly (1 time per quarter);
- Key equipment: coordinate measuring instrument, surface roughness meter.
CGK-500 High-Precision Planetary Screw Grinding Machine
The CGK-500 High-Precision Planetary Screw Grinding Machine is a high-end CNC grinding device designed for planetary roller screws. It features a Siemens 828D CNC system and HEIDENHAIN linear scales, delivering helix accuracy ≤0.004mm (within 2π) and surface roughness Ra≤0.32μm. It completes all processes in one clamping, boosting productivity by 33% and reducing scrap rates from 18% to 5%, making it ideal for core transmission components in new energy vehicles and aerospace.
High Precision External Grinding Earnings Data
| Indicator | CGK-500 Grinding Machine | Traditional Grinding Machine | Improvement Range |
|---|---|---|---|
| Helix Accuracy (within 2π) | ≤0.004mm | ≥0.01mm | Over 60% Improvement |
| Processing Efficiency | 12 pcs/day | 9 pcs/day | +33% |
| Scrap Rate | 5% | 18% | -72% |
| Annual Maintenance Cost | ¥12,000 | ¥14,000 | -14% |
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