CNC High Precision Ball Screw Whirling Solution

What is High Precision Ball Screw

Usage: Ball screws/trapezoidal screws are the core transmission components of CNC machine tools, robots, and automation equipment, responsible for converting rotational motion into linear motion, which directly affects the positioning accuracy and operational stability of the equipment.
Material/geometric features:

• Material: Bearing steel (SUJ2), stainless steel (304/316), titanium alloy (TC4), etc.;
• Structure: slender rod shape (length up to 5000mm), complex threaded tooth shape (arc/trapezoid), thin wall easy to deform;
• Size: Diameter φ12-50mm, maximum installation diameter φ100mm, top distance 500mm.
• Common Risks:
• Machining: Traditional lathe processing is prone to slender rod deformation, irregular thread tooth shape, and surface burns;
• Limitations of traditional processes: Inability to achieve high-precision multi-head threading and poor consistency in mass production.

High Precision Ball Screw Whirling Core Pain Point

Pain point 1: Traditional processing efficiency is low

• Efficiency impact: 50% longer production cycle and inability to meet order delivery periods;
• Cost impact: manual tool change/adjustment is time-consuming, and the processing cost per piece increases by 15 yuan;
• Quality Impact: Manual tool setting errors are large, with a scrap rate of 12%.

Pain point 2: The deformation problem of slender rods is prominent

• Efficiency impact: 15% rework rate, 2 hours for single piece rework;
• Cost impact: annual rework cost exceeds 80,000 yuan;
• Quality impact: The straightness of the finished product is not up to standard, and the customer complaint rate increases by 10%.

Pain point 3: Poor accuracy consistency

• Efficiency impact: 30% increase in batch inspection time;
• Cost impact: The cost of disposing of defective products accounts for 10% of the total production cost;
• Quality Impact: The accuracy of multiple batches of products fluctuates ± 0.05mm, which cannot pass customer acceptance

High Precision Ball Screw Whirling Process

Complete link: blank preparation→ roughing (turning the outer circle) → CGK403 cyclone milling finishing→ surface treatment (nitriding/chrome plating) → quality inspection (CMM)
Core position: CGK403 is responsible for the high-precision processing of thread tooth shape, which is the key link that determines the quality of the finished product;
Connection relationship: After rough machining, it directly enters the cyclone milling link, and realizes seamless connection through the dynamic tool setting function to reduce clamping errors. The testing process uses coordinate measuring instruments to verify accuracy to ensure that it meets customer requirements.

(1) Blank preparation

• Method: Bearing steel/SUS304 bar is selected and annealed to eliminate internal stress;
• Parameters: bar diameter φ12-100mm, length ≤ 5000mm;
• Risk control: annealing temperature deviation of ±5°C to avoid uneven material hardness;
• Equipment: Intermediate frequency annealing furnace.
  (2) Rough machining
• Method: Turning the outer circle to the diameter of the finished product +0.5mm, ensuring the cylindrical ≤ 0.02mm;
• Parameters: rotation speed 800-1200rpm, feed 0.15-0.2mm/r;
• Risk control: use center frame support to prevent the slender rod from bending;
• Equipment: Ordinary lathe CK6140.
  (3) CGK403 cyclone milling finishing
• Method: Internal rotation cyclone milling, fully automatic cyclic processing of thread tooth shapes;
• Parameters: milling cutter speed 3000-5000rpm, feed 0.05-0.1mm/r, pitch compensation range ±0.005mm;
• Risk control: full closed-loop control (Heidenhain scale + Renishaw encoder) to correct errors in real time;
• Equipment: CGK403 high-precision screw cyclone milling
  (4) Surface treatment
• Method: nitriding treatment to increase surface hardness to HV550-600;
• Parameters: nitriding temperature 520°C, holding time 8 hours;
• Risk control: Nitrogen purity ≥ 99.99% to avoid oxidation;
• Equipment: Vacuum nitriding furnace.
  (5) Quality inspection
• Method: CMM detects thread accuracy and straightness;
• Parameters: measurement accuracy±0.002mm;
• Risk control: 10% of each batch is sampled, and the key dimensions are fully inspected;
• Equipment: Zeiss CMM.

High Precision Ball Screw Whirling Earnings Data

Indicator	Traditional Lathe Processing	CGK403 Whirling Milling	Improvement Range
Machining Accuracy (within 300mm)	±0.05mm	±0.012mm	76% ↓
Surface Roughness	Ra1.6μm	Ra0.3μm	81% ↓
Production Cycle	2h/pcs	1h/pcs	50% ↓
Rework Rate	15%	2%	87% ↓

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