Common problems of ultrasonic riveting

Update time:30-04-2021
Summary:

phenomenon: Riveting points are not uniform, and there […]

phenomenon:
Riveting points are not uniform, and there are dents

the reason:
The riveting cavity is too large or the rivet is too small

Solution:
Reduce welding head riveting size or increase rivet height or diameter

Phenomenon: There is excess flash around the riveting point

the reason:
1. The riveting cavity is too small or the rivet is too large

2. Rivet and welding head riveting cavity center is not accurate

Solution:
Decrease pressure or increase amplitude

Adjust the throttle valve to slow down the descent speed of the welding head

phenomenon:
The apex of the rivet is not yet formed and the bottom of the rivet has begun to melt and collapse

the reason:
1. Too much pressure or too small amplitude

2. The welding head descends too fast

Solution:
Decrease pressure or increase amplitude

Adjust the throttle valve to slow down the descent speed of the welding head

phenomenon:
Surface damage occurs on one side of the bottom of the rivet

the reason:
1. Improper die support

2. Too much stress

Solution:
Try metal materials as the support of the lower die

Reduce the pressure and add a metal sheet between the rivet and the base for heat dissipation to reduce damage

phenomenon:
After riveting, the workpiece is loose

the reason:
1. The melted rivet is not completely solidified before the pressure is removed

2. Not riveted

Solution:
Extend the holding time or use a clamp to clamp

1. Adjust the stroke 2. Extend the welding time

phenomenon:
When riveting, the root of the rivet is broken

the reason:
1. The unreasonable transition between the rivet and the base makes the stress too concentrated

2. The welding head and the rivet are not at right angles

Solution:
Improve the transition structure of rivets

Check alignment

phenomenon:
The plastic workpiece slides when riveting

the reason:
Not clamped

Solution:
Improve the lower mold and improve the clamping effect

Ultrasound equipment

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