1、 Processing depth control: precise control from micrometer to millimeter level
Mechanical pressure regulation
Hydraulic closed-loop system: Real time feedback through pressure sensors (accuracy ± 0.5N/cm ²), with a recommended pressure of 15-25N/cm ² for hard metals (such as stainless steel) and 8-12N/cm ² for soft metals (aluminum, copper).
Step by step pressure method: During the rough machining stage, progressive pressure is applied (such as increasing by 5N/cm ² every 30 seconds) to avoid instantaneous deformation of the material, especially suitable for thin plates with a thickness of less than 1mm.
Sand belt/wire drawing wheel selection
Table of Contents Depth Correspondence:
Theoretical cutting depth of sand belt mesh (μ m) applicable stage
#60- # 120 50-200 rough machining
#240- # 400 20-50 semi precision machining
#600 ↑＜ 10 mirror preparation
Composite wheel layering technology: Hard core wheels (steel based) are suitable for processing depths greater than 0.1mm, while soft wheels (polyurethane) are used for surface fine tuning (depths less than 0.02mm).
Auxiliary process
Laser ranging calibration: Scan the sheet with an infrared thickness gauge before processing, and automatically compensate for the Z-axis travel of the equipment (compensation accuracy ± 0.01mm).
Multi pass strategy: When the depth is greater than 0.3mm, it is processed 3-4 times (reducing by 50% each time), which improves the efficiency by 20% compared to a single deep cutting and reduces sand belt loss.
2、 Processing speed control: balancing efficiency and quality
Material speed matching model
Basic formula:V=K×H
zero point eight
Ra
one point two
V= Ra
one point twoK×H
zero point eight
(V=line speed m/min, K=material coefficient, H=material hardness HRC, Ra=target roughness)
Example: When processing 304 stainless steel (HRC20) to Ra1.6 μ m and K is 0.6, V≈14m/min
Dynamic speed regulation strategy
Rough machining stage: High speed priority (18-30m/min), combined with large particle sand belt to quickly remove excess;
Precision machining stage: Reduce the speed to 8-15m/min, while switching the fine sand belt (# 600 ↑) to ensure texture consistency.
Exception handling: When the vibration sensor detects an amplitude greater than 0.1mm, it automatically decelerates by 30% to prevent material chatter.
Intelligent linkage solution
Speed pressure coupling: When the speed increases by 20%, the system automatically increases the pressure by 10% to maintain stable cutting force;
Temperature feedback speed regulation: When the temperature in the processing area exceeds 70 ℃, the cooling system is triggered and the speed is reduced to 80% of the set value.
3、 Practical case: The Magic Effect of Parameter Combination
When processing aluminum alloy panels (thickness 2mm) at a certain automotive parts factory:
Rough machining:
Parameters: # 120 grit sand belt+22m/min+18N/cm ² → 3 passes to remove 0.4mm depth (Ra6.3 μ m);
Precision machining:
Parameters: # 800 grit sand belt+10m/min+6N/cm ² → final Ra0.8 μ m, with no edge debris.
Result: The processing time for a single piece has been reduced from 8 minutes to 5 minutes, and the lifespan of the sanding belt has been extended to 150 hours.
4、 Maintenance points
Depth control verification: Use a surface profilometer to test 5 samples per shift, and calibrate the pressure system when the depth fluctuation is greater than ± 0.02mm;
Speed calibration: Use an encoder to detect the actual speed of the transmission wheel every month. If the deviation is greater than 3%, the belt or servo motor needs to be replaced.
