CNC Ball Screw Thread Grinding Solution

What is Ball Screw

Ball screws are the core transmission components in high-end equipment – they convert rotational motion into linear motion with minimal friction, which is essential for CNC machines (5-axis mills/lathes), industrial robots (joints) and automation systems (linear modules). Common materials include SUJ2 (bearing steel) and SKD11 (alloy tool steel), which require high hardness (HRC 60 – 62) and wear resistance.
Geometric complexity: precise thread profile (lead error ≤ 0.01mm/m), variable helix angle (1-30°) and large aspect ratio (up to 40:1). Common risks: thermal distortion during grinding, pitch errors that cause motion jitter, and surface roughness exceeding Ra0.8 μm (leading to premature wear). Traditional grinding methods often struggle to balance precision and efficiency, leading to scrap rates exceeding 15% and missed delivery deadlines.

Ball Screw Thread Grinding Core Pain Point

1. Accuracy Gap: Traditional grinding machines lack closed-loop control, resulting in thread errors (≥0.02mm/m) and surface roughness (Ra≥0.8μm), which cannot meet the C3 level requirements of high-end equipment.
2. High Scrap Rate: Uncontrolled thermal deformation and helix angle errors lead to scrap rates of 15-20%, increasing material and labor costs.
3. Slow service response: Overseas suppliers take more than 7 days to resolve issues, leading to production line downtime and order delays (losing more than $10,000 in revenue per day).

Ball Screw Thread Grinding Process

CGK2000 follow a five-step process to ensure optimal quality and efficiency:

1. Blank preparation: Use forged SUJ2 blanks (hardness HRC 25-30) to reduce the risk of deformation.
2. Rough grinding: Adopt five-axis linkage to remove excess material, the pitch range is 1.5-48mm, and the helix angle is adjusted by manual setting + Renishaw encoder feedback.
3. Fine grinding: Constant linear speed (28-45m/s) is used to achieve C3 accuracy and surface finish of Ra0.32μm; Siemens servo motor is used to control the thread lead error in a closed loop.
4. Surface Treatment: Surfaces are passivated to enhance corrosion resistance and reduce wear.
5. Quality Inspection: Verify thread accuracy, surface roughness, and diameter tolerances using an online measurement system – a scrap rate of ≤5%.
   High-end components (Siemens systems, THK ball screws) are integrated at every step to minimize risk and maximize output.

Ball Screw Thread Grinding Earnings Data

Key performance indicators CGK2000:

• Accuracy: C3 thread accuracy (lead error ≤0.01mm/m), surface roughness Ra0.32μm.
• Efficiency: 25% reduction in production cycles (from 5 days to 3.75 days per 2000 mm ball screw)
• Cost: Reduces scrap rate by 30% (from 15% to 5%) and extends tool life by 20% through the use of coated grinding wheels.

Contact us for further consultation on cooperation details or customized solutions. We look forward to partnering with you to create mutual value!