• Wet continuous method combined magnetization magnetic particle inspection process is adopted to conduct all-round overall inspection of the inspected parts;
• Verify the comprehensive sensitivity of the flaw detector with BE test block;
• Adopting fluorescent magnetic particle flaw detection technology, the ultraviolet illumination at 381mm away from the surface of parts is not less than 4000uW/cm;2
• Use programmable controller to manually control or automatically control the operation of the equipment;
• After demagnetization, the residual magnetism on the parts is less than 0.2MT;
• Considering the specific shape of the parts and the above requirements, the technical scheme is made for reference.

Circumferential magnetization is to establish circumferential magnetic field on the surface of the flaw detection part to detect the longitudinal discontinuity (defect) of the part.

The circumferential magnetic field is established on the surface of the part by direct electrification method to detect the magnetization mode of the longitudinal discontinuity of the part.

The so-called direct electrification method is a magnetization method that makes the connecting rod as a conductor to connect the circumferential electrode to form a magnetization current path and establish a circumferential magnetic field on the surface of the part to detect the longitudinal defects on the surface of the part.

Longitudinal magnetization is to establish longitudinal magnetic field on the surface of the part to detect the circumferential discontinuity (defect) of the part.

In this scheme, longitudinal magnetic field is established on the surface of the part by coil induction method to detect the circumferential discontinuous magnetization mode of the part.

The so-called coil induction method is a magnetization method that places the detected connecting rod inside the effective magnetic field of the coil to obtain the magnetic field direction parallel to the axial direction to detect the circumferential defects on the surface of parts.

CZQ-4000 AC/DC fluorescent magnetic particle inspection machine is an electromechanical separate structure, consisting of three-phase full wave DC 6000A, AC 6000A power supply system and CZQ-6000 bed system.Mainly includes the power supply control system, clamping magnetizing device, magnetic suspension spray system, fluorescence system and darkroom several major components, suitable for wet magnetic particle method in detecting tube made of ferromagnetic material, the shaft rod, such as parts of surface and near surface of casting, forging, machining, and fatigue crack due to a variety of causes and various minor defects.

The equipment adopts manual and automatic operation mode, controlled centrally by programmable controller (PLC).Manually, each function can be independently operated in a single step; Automatic, the equipment automatically execute the PLC internal program, workpiece in place, workpiece clamping - spray - rotation - magnetization - artificial observation and a series of semi-automatic actions.The man-machine interface is used for digital setting, closed-loop control and automatic tracking of magnetization current, and the tracking error is less than ±5%.The magnetization time and interval (off machine) time, initial demagnetization current, demagnetization frequency and demagnetization time are pre-selected and automatically controlled, thus greatly improving the detection accuracy.The equipment has the advantages of simple operation, good reliability, low labor intensity, high efficiency and energy saving.Dc magnetization on the depth of workpiece surface and away from the workpiece surface crack defects, all have high detection sensitivity, and can perform a ultra-low frequency dc demagnetization, remanent magnetism of workpiece surface and deep has good demagnetizing effect, ac magnetization with phase control power, has a good stability of the residual magnetism inspection to check new method, both suitable for residual method inspection to check again. Through the high-power switch, the form of circumferential and longitudinal magnetization current can be arbitrarily switched to achieve circumferential DC, longitudinal AC or circumferential AC, longitudinal DC. The composite magnetization forms a rotating magnetic field on the workpiece, and the magnetic trace is displayed in all directions at one time, which has high working efficiency.

1. Circumferential magnetization current:

   AC: 0-4000A (standard specimen) effective value, digital setting, closed-loop control, automatic tracking, tracking error ≤±5%;

   DC: 0-4000A (standard specimen) three-phase full-wave average value, digital setting, closed-loop control, automatic tracking, tracking error ≤±5%;

2. Longitudinal magnetization magnetic potential:

   AC: 0-18000AT effective value, digital setting, closed-loop control, automatic tracking, tracking error ≤±5%;

   DC: 0-18000AT three-phase full-wave average value, digital setting, closed-loop control, automatic tracking, tracking error ≤±5%;

3. Magnetization sensitivity: A1-30/100 test piece clearly displayed; DC AS5282 ring (B type test block) 2500A7 hole visible or KETOS01 tool steel 2500A5 hole visible; AC test block (E type test block) in the test, through 700A AC current (effective value), there is a hole display clear;
4. Magnetization time: adjustable 0.1-9.9s;
5. temporary load rate: ≥25%;
6. magnetization mode: circumferential, longitudinal and composite;
7. Operation mode: manual and automatic operation;
8. electrode spacing: 100-1900mm, continuous electric adjustable;
9. Inner diameter of coil (about) : 280mm;
10. Clamping mode: pneumatic;
11. air source pressure: 0.4-0.6mpa;
12. electrode plate diameter (about) : φ250mm;
13. demagnetization:

    AC:4000-0A (standard specimen) effective value;

    Demagnetization mode: automatic attenuation demagnetization;

    Demagnetization time: 5.0s;

    DC: 4000-0A (standard specimen) three-phase full-wave average value;

    Demagnetization mode: ultra-low frequency demagnetization;

    Demagnetization frequency: 0.3-4.0Hz digital setting;

    Demagnetization time: 10-99s digital setting;

14. demagnetization effect: ≤160A/M (0.2Mt) (standard demagnetization specimen);
15. Charging and demagnetization time control precision: ± 0.1s;
16. power supply: three-phase five wire 380V±10% 50HZ instantaneous 300A;
17. Overall dimension of the equipment (about) : 3800 (l) ×1110 (W) ×1500 (H) mm;
18. Weight: about 1300Kg.

• Before operation and use, must carefully read the Operation Instruction, and fimiliar with each button’s function and entire workflow of equipment;
• When operate or use it, the operator and user must show their certificates, or else may directly cause misjudgment, or even omission;
• The configuration cable of equipment is rigorously measured, shall not be lengthened or shortened optionally, or else may cause equipment’s magnetization current supply be in short, or very likely to cause equipment’s overload and damage;
• Power inlet wire is configured strictly according to technical parameters’ requirements, and must add automatic air switch with corresponding functions;
• The equipment shall not be parallel with intermediate and high frequency equipments of high-power;
• The equipment must be reliably grounded.