How the Detector Works?
- Magnetization:
- Either circular or longitudinal magnetization, or both in sequence, is applied.
- Due to the complex geometry, multi-directional magnetization is often used to ensure full coverage.
- Application of Fluorescent Particles:
- Fluorescent magnetic particles are sprayed or immersed onto the surface.
- Particles accumulate at discontinuities due to magnetic leakage fields.
- UV Light Inspection:
- The part is inspected under UV-A black light in a darkened chamber.
- Flaws glow bright green/yellow against a dark background.
System Components:
- . Magnetizing Station
- Custom fixtures to hold irregularly shaped knuckles.
- Electromagnetic coils or clamp electrodes for magnetization.
- Often uses wet horizontal units adapted with jigs.
- Fluorescent Particle System
- Spray system or immersion tank with recirculating magnetic bath.
- Fine particles in water or oil carrier, designed for high sensitivity.
- UV Inspection Booth
- Darkroom enclosure with UV-A LED lighting (~365 nm).
- Conforms to ASTM/ISO UV intensity and darkness standards.
- Demagnetization Unit
- Ensures residual magnetism is removed after inspection.
- Control System
- Allows programmable control of magnetization sequence, spray duration, and inspection timing.
Main Technical Indicators of the Equipment:
- Circumferential magnetizing current I: AC: 0-6000A (effective value) continuously adjustable, with power-off phase control (no missed detection).
- Circumferential magnetizing current II: AC: 0-6000A (effective value) continuously adjustable, with power-off phase control (no missed detection).
- Longitudinal magnetizing magnetic potential AC: 0-18000AT (effective value) continuously adjustable, with power-off phase control (no missed detection).
- Electrode spacing: 0-700mm.
- Magnetization principle: power-on, coil method.
- Magnetization method: circumferential magnetization, longitudinal magnetization, and composite magnetization can be flexibly selected.
- Use environment: -10℃-+40℃, relative humidity ≤80%.
- Storage environment: temperature -20℃-60℃, relative humidity ≤70%. No corrosive gas, dust, and strong high-frequency electromagnetic pollution.
- Ultraviolet intensity: The ultraviolet intensity is greater than 4000μW/cm2 at 380mm from the workpiece.
- Sensitivity test: According to the provisions of the Mechanical Industry Standard of the People’s Republic of China JB/T6065-92 “Standard Test Piece for Magnetic Particle Inspection”, the standard No. 2 A-type test piece is used for testing, and the display is clear.
- Power supply: three-phase four-wire, 380V±20%, 50Hz, about 250A. (Equipment voltage is customizable.)
- Inspection surface: cracks and other defects on the entire surface of the workpiece.
- Demagnetization: AC18000-0 (effective value) attenuation automatic demagnetization.
- Residual magnetism: Br≤ 0.2 mT.
- Workpiece rotation observation speed: 4- 6 rpm.
- Magnetic coil: inner diameter 500mm.
- Pneumatic clamping: clamping stroke 0-100mm. Coil extension cylinder stroke 0-350mm.
- Air source pressure: 0.4- 0.8MPa.
Application:
- Automotive suspension and chassis manufacturing.
- Tier-1 automotive parts suppliers.
- Quality control in forging or casting plants.
- Maintenance & overhaul facilities for commercial vehicles.
