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The bell housing needs to be magnetized in two directions perpendicular to each other.

A circular magnetic field is used to detect longitudinal flaws in the part.

Circular magnetic field is generated by passing a current through the length of the bell housing.

Calculation of head shot current is done as per the formula given in ASTM standards.

Head Shot Current            =        20 X Diameter(mm)

In the above formula, the diameter should be taken as diameter of the base portion.

 

Longitudinal magnetic field, required for detection of transverse defects is generated by using an encircling coil.

Formula for calculation of coil current

In the above formula, the diameter should be taken as the average diameter of the bell housing.

 

A horizontal bench type machine is used to perform magnetic particle testing on bell housings. Bell housing is placed on the steady rollers fitted on the head & tailstock of the machine. A pneumatically operated arrangement is used to clamp the bell housing from both ends. Pneumatic clamping ensures that there is no sparking when high current is passed through the bell housing. Use of braided copper pads is also recommended to eliminate arcing sparks.

 

Conventional Technique

A two vector PLC based bench type magnetic crack detector machine is used to perform testing on the bell housings.

 

Testing Procedure for conventional machines

  • Clean up & dry the bell housing’s surface before inspecting.
  • The bell housingis placed on the steady rollers.
  • Now apply magnetic solution bath to the bell housing.
  • Press the ‘Cycle Start’ button.
  • The bell housing automatically gets clamped.
  • Stop the flow of bath.
  • Now, the current passes through the bell housing.
  • It shows up on the digital metering unit.
  • The bell housing automatically gets de-clamped.
  • Inspect the bell housing under UV light for longitudinal defects. Rotate on steady rollers.
  • Now, again apply bath to the job.
  • Press the ‘Cycle Start’ button.
  • Stop the flow of bath.
  • Now the current passes through the coil.
  • It shows up on the digital metering unit.
  • Inspect the bell housing under UV light for transverse defects. Rotate on Rollers
  • Demagnetize

Multidirectional Technique

In this tailor-made machine, the coil is automatically moved using pneumatic actuators.

Since the length of the housing is short, coil is moved aside to facilitate the loading of the part.

 

Testing Procedure for Multidirectional machines

  • Clean up & dry the bell housing’s surface before inspection
  • Place the bell housing on the steady rollers.
  • Now apply a bath to the bell housing.
  • Press the ‘Cycle Start’ button.
  • The bell housing will automatically get clamped &the Coil will come into position
  • Stop the flow of the bath.
  • Now the current will pass through the bell housing& the coil in multidirectional mode.
  • It will show up on the digital metering unit.
  • The bell housing will automatically get de-clamped.
  • Inspect the bell housing under UV light for defects in all directions. Rotate on rollers.

suitable products

Standard MPI Machines

Engineered for precision and efficiency, the Standard Bench Type Magnetic Particle Testing Machine is suitable for entry level testing.

PLC Controlled MPI Bench

With PLC Controlled bench type Magnetic Particle Inspection Machine, you can accurately control the process parameters for reilable results.

Multidirectional MPI Bench

The ultimate solution for robust non-destructive testing, this machine offers multi-directional magnetization for inspection in all directions in one shot..

Demagnetizers

Demagnetizers stand as a key tool in maintaining excellence in production, with the flexibility to handle different materials and magnetism levels, coupled with energy-efficient and user-friendly design.

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