Micron‑Grade Precision for High‑End Power Transmission
As the core transmission component in new energy vehicles, precision machine tools, robot joints, and aerospace drive systems, splined shafts carry heavy torque, high‑speed rotation, and long‑life reliable meshing and accurate positioning. Their straightness directly determines the NVH performance, transmission efficiency, and service life of the entire assembly. For splined shafts of Φ15 mm × 300 mm with straightness ≤ 0.02 mm, conventional manual or semi‑automatic straightening suffers unstable precision, spline surface damage, low efficiency, and poor consistency, failing to meet high‑end manufacturing requirements.
The Amolin AMS‑400‑3 Automatic Straightening Machine for Splined Shafts integrates servo closed‑loop measurement & control, 3‑point high‑precision measurement, and intelligent pressure compensation to realize unmanned full‑process operation from detection, positioning, pressing, to re‑inspection. It stably delivers 0.02 mm straightness and provides a robust solution for mass production of precision splined shafts.
I. Splined Shafts: The Core of Precision Transmission
Splined shafts feature multi‑tooth meshing for high torque capacity, precise centering, and smooth guiding. They are widely used in:
- New energy vehicles: drive motor reducers, motor output shafts, gearbox shifting mechanisms, requiring low vibration and long service life;
- Precision machine tools & robots: spindles, joint drives, servo actuators, where coaxiality and straightness directly affect positioning accuracy;
- Aerospace & construction machinery: high‑pressure compressors, gearboxes, heavy‑duty drive shafts, ensuring reliability under extreme conditions.
Key Precision Pain Points
Deformation caused by post‑heat‑treatment bending, residual stresses from turning/milling/rolling; inconsistent manual straightening; easy damage to spline surfaces and outer diameters; excessive runout leading to noise, accelerated wear, and premature failure. A bend of just 0.05 mm can drastically increase transmission noise and shorten service life.
II. 0.02 mm Straightness: The Critical Threshold for Splined Shafts
For Φ15 mm × 300 mm splined shafts, 0.02 mm straightness is the entry barrier for high‑end supply chains:
- Smooth transmission: uniform meshing clearance, reducing impact and eccentric wear;
- Low noise & vibration: meeting NVH ≤ 65 dB(A) standards for vehicles and equipment;
- Easy assembly: excellent coaxiality boosting efficiency and yield;
- Extended lifespan: uniform stress distribution significantly improving fatigue resistance.
III. AMS‑400‑3: One‑Step 0.02 mm Straightness Solution
- Full Closed‑Loop Intelligent Straightening Process
- Automatic loading → manipulator pickup → double‑end center clamping & rotation;
- 3‑point high‑precision displacement sensors inspect full‑circumference runout; PLC calculates bending value and orientation;
- Movable supports align precisely; servo slide positions the pressing point;
- 50‑ton servo pressing with closed‑loop control delivers micron‑level stroke correction;
- Automatic post‑straightening re‑inspection: qualified parts discharge, out‑of‑limit parts rejected with alarm, fully unattended.
- Core Technologies Guaranteeing 0.02 mm Precision
- Measuring system: KEYENCE high‑precision displacement sensors + encoders, real‑time acquisition of rotation angle and runout, repeat measurement accuracy ±0.001 mm;
- Servo pressing: ball screw + servo motor, dual closed‑loop control of force and displacement, stroke resolution 0.001 mm, avoiding over‑pressing or under‑pressing;
- Special clamping Unit: MT‑type floating centers + axial clamping, no damage to spline teeth or center holes, suitable for shafts Φ3–15 mm, length 50–400 mm;
- Closed‑loop quality control: 100% post‑straightening inspection with data traceability, ensuring stable straightness ≤ 0.02 mm.
- Exclusive Advantages for Splined Shafts
- Spline protection: non‑tooth pressing + flexible supports preserving tooth profile and surface finish;
- High efficiency & stability: cycle time 30–240 s per piece, 24/7 mass production, consistency far exceeding manual work;
- Fast changeover: stored parameter recipes, one‑click specification switching for mixed small‑batch production;
- Safe & reliable: full guarding, audible & visual alarms, automatic out‑of‑limit sorting, reducing labor risks.
Key Specifications (for Splined Shaft Application)
- Processing Range: Φ15 mm × 300 mm splined shaft
- Straightening accuracy: ≤ 0.02 mm
- Pressing force: 50‑ton servo cylinder
- Measuring units: 3‑point high‑precision displacement sensors
- Control system: KEYENCE PLC + Proface touchscreen
- Power supply: 380 V / 3P / 50 Hz, approx. 35 kW
- Air supply: 0.5 MPa
- Dimensions: L4300 × W2000 × H2300 mm, approx. 1.5 tons
V. Why Choose AMS‑400‑3
- Precision compliance: stable 0.02 mm straightness approved by high‑end customers;
- Cost efficiency: automation replaces labor, raising yield while slashing rework and scrap;
- Flexible production: adapts to various splined shafts and shaft parts, quick changeover;
- Worry‑free after‑sales: 12‑month warranty, professional installation and training, 7×24 h technical support.
Conclusion
In the era of micron‑scale manufacturing for precision transmission, the straightness of splined shafts defines product competitiveness. The Amolin AMS‑400‑3 Automatic Straightening Machine uses intelligent measurement & control, servo precision straightening, and full‑process automation to stably achieve 0.02 mm straightness for Φ15 mm × 300 mm splined shafts. It helps manufacturers break precision bottlenecks, boost capacity and quality, and seize the high‑end manufacturing market.
The following is the video about the straightening for this splined shafts:
More information please visit our straightening machinery website:
www.straighteningmachinery.com
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