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Analysis and Treatment of Common Problems in Ultrasonic Riveting
Latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting

Analysis and Treatment of Common Problems in Ultrasonic Riveting

 

1. The rivet head is inconsistent and the appearance is uneven

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  0

 

Reason:

  • The riveting cavity is too large or the pin is too short
  • Excessive amplitude leads to material degradation

Solution:

  • Reduce the size of the cavity or increase the height of the pin
  • Reduce the amplitude or use the amplitude step

 

2. There are too many flash edges around the rivet head

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  1

 

Reason:

  • The riveting cavity is too small or the pin is too high
  • Mechanical stop setting is too high
  • The pin is not centered in the cavity of the welding head

Solution:

  • Increase the size of the cavity or reduce the height of the pin
  • Reduce mechanical stops
  • Check concentricity

 

3. The rivet is formed at the upper pin of the pin; the bottom of the pin melts and begins to shrink

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  2

 

Reason:

  • The sharp corner at the bottom of the pin causes stress concentration
  • The clamping pressure is too high or the amplitude is too small
  • The welding head is too short or the speed is too fast.

Solution:

  • Increase the radius at the bottom of the pin
  • Reduce the pressure too high or increase the amplitude
  •  Increase the downstroke or decrease the descending speed

 

4. Severe indentation and deformation on the other side of the rivet head

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  3

 

Reason:

  • Improper clamping
  • The clamping pressure is too large

Solution:

  • Test the metal support fixture and reduce the amplitude in the lower part of the riveting area
  • Reduce the clamping pressure and place a metal plate between the pin and the clamp as a heat sink to reduce the indentation

 

5. Loose workpiece after riveting

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  4

 

Reason:

  • The molten pin does not completely solidify before the pressure is released.
  • Limit stop or lower limit setting is too high

Solution:

  • Extend the pressure holding time
  • Reduce mechanical stops

 

6. The bottom of the pin is broken during the riveting process

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  5

 

Reason:

  • Stress concentration at the sharp corner of the pin
  • The pin and the tip of the horn are not perpendicular

Solution:

  • Increase the bottom radius of the pin
  • Check the alignment

 

7. Deformation caused by plastic flow between workpieces during riveting

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  6

 

Reason:

  • The amplitude is too high
  • The gap between the pin and the hole is too large

Solution:

  • Reduce amplitude or purchase amplitude step
  •  Reduce the aperture
  • Use an external or external node plunger for better sealing

 

8. Severe indentation and deformation on the other side of the rivet head

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  7

 

Reason:

 

The metal is not properly placed at the bottom of the plastic part

 

Solution:

  • Increase welding and holding time
  • Increase the height of the pin

 

9. The rivet head is poorly formed and the pin material sticks to the surface of the horn

 

latest company news about Analysis and Treatment of Common Problems in Ultrasonic Riveting  8

 

Reason:

  • Poor fit between the pin diameter and the through hole
  • Material flows into the gap between the pin and the workpiece
  • Insufficient lubrication of the surface of the welding head

Solution:

  • Slip fit between the pin and the through hole
  • Improve the fit between the pin and the through hole
  • Test weld head coating (such as TiN)
Pub Time : 2019-09-07 10:02:20 >> News list
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