Precision slit aluminum strip is processed from wide aluminum coils into narrow strips according to specific sizes to meet the precision needs of electronics, automobiles, new energy, packaging and other fields. The quality of precision slitting of aluminum strips directly determines its application effect in high-end manufacturing fields. For example, scenarios such as new energy battery current collectors, electronic component packaging and precision instrument components have strict requirements on the slitting accuracy, surface integrity, edge quality and mechanical properties of aluminum strips.

The following is an analysis of the precision slitting process:
1. Preparation stage before slitting
- Raw material pretreatment
The aluminum strip mother roll needs to be annealed to eliminate internal stress, and the hardness is controlled in the range of H18-H22 to ensure ductility and slitting stability. The surface cleanliness must meet the Sa2.5 standard to prevent impurities from affecting the tool life. A laser diameter gauge is used to detect the thickness fluctuation of the mother roll, and the error must be ≤±1.5%.
- Equipment parameter setting
Set the slitting tension according to the thickness of the aluminium strip (0.05-2.0mm) and the alloy grade (such as 1060/3003/5052), which is usually controlled at 15-25% of the material yield strength. The tool system uses carbide circular knives (HRC62-65) or diamond-coated tools, and the radial runout of the knife shaft is ≤0.005mm.

2. Core technology of precision slitting
- Dynamic slitting mode
Circular knife slitting: Use upper and lower knife shaft pressure cutting, the gap is controlled to 5-8% of the thickness of the aluminum strip, and the speed difference is 3-5% to form shear force. Suitable for 0.1-1.2mm thick aluminum strips, the speed can reach 300m/min.
Rolling shear slitting: The blade inclination angle is 2-5°, and the burrs are reduced by progressive shearing. It is particularly suitable for ultra-thin aluminum foil (<0.1mm) slitting, and the cut roughness Ra≤0.8μm.
- Closed-loop tension control
A closed-loop system of magnetic powder brake + tension sensor is used to control the tension fluctuation in the slitting area within ±1N. The constant linear speed algorithm is applied in the winding process, and the EPC edge correction system (accuracy ±0.1mm) is used to avoid serpentine bending.

3. Process quality control
- Online monitoring system
The laser width gauge monitors the bandwidth tolerance in real time (±0.02mm)
The high-speed CCD camera (5000 frames/s) detects edge burrs (＜10μm)
The eddy current flaw detector scans surface defects with a resolution of 0.1mm²
- Process parameter optimization
Establish a thickness-speed-tension relationship model: V=K×(T/σ)^0.5 (V: slitting speed, T: tension, σ: material tensile strength, K: equipment coefficient). The tool geometry angle is optimized through finite element simulation, and the cutting force can be reduced by 30% when the rake angle is 8-12°.

4. Post-processing and packaging
After slitting, aluminum powder (particle size <5μm) is removed by a brush shaving device, and the surface voltage is reduced to <50V by an electrostatic eliminator. The air shaft is used for winding (radial pressure 0.2-0.5MPa), and the inner layer is lined with a 0.05mm polyethylene film to prevent scratches. The qualified rate of finished product bandwidth must reach more than 99.98%, and the end face misalignment of the coil is <0.1mm.


5. Core indicators of slitting quality
- Dimensional accuracy
Band width tolerance: ±0.02mm (electronic grade aluminum strip requires ±0.005mm)
Thickness consistency: full roll thickness fluctuation ≤±1%
End face straightness: misalignment <0.1mm (detected by laser interferometer)

- Edge quality
Burr height: ordinary grade ≤20μm, precision grade ≤5μm (SEM scanning electron microscope measurement)
Incision morphology: no tearing, curling or microcracks (100x microscope observation)
Roughness: Ra≤0.4μm (stylus profilometer Detection)

- Surface integrity
No scratches: Surface defect depth <0.5μm (white light interferometer detection)
Cleanliness: Residual aluminum powder ≤5mg/m² (weighing method test)
Oxidation control: Surface oxide film thickness after slitting ≤10nm (XPS analysis)

- Mechanical property retention
Yield strength change rate ≤3% (tensile test after slitting)
Elongation loss <5%

When selecting precision slit aluminum strip, factors such as aluminum alloy composition, thickness, width, surface treatment, etc. need to be considered to ensure that it meets specific application requirements.