Dukane 210 Manuale Utente Scaricare il pdf (Pagina 70)

Dukane Manual Part No. 403–558–03

Dynamic Process Controller DPC

™

II – User’s Manual

Ultrasonic Horn

The horn transfers the ultrasonic mechanical vi-

brations (originating at the transducer in the probe

housing) to the plastic parts through direct physi-

cal contact. The horn is precision machined and

designed to vibrate at either 15kHz, 20kHz, 30kHz,

40kHz, 50kHz or 70kHz. The tuning is accom-

plished using electronic frequency measurement.

Inherent variations in material composition prevent

tuning by dimensional machining alone.

There are many different horn prole styles

depending upon the process requirements. Fac-

tors which affect the horn design are the materi-

als to be welded and the method of assembly.

Horns are usually constructed from aluminum,

hardened steel or titanium. As the frequency in-

creases, vibration amplitude typically decreases,

but internal stress in the horn increases. Higher

frequencies are used for delicate parts that can-

not handle a lot of amplitude. Some factors to

keep in mind for high–frequency (e.g. 40kHz)

ultrasonic welding versus low–frequency (e.g.

20kHz) ultrasonic welding are listed here.

1. Stress in the horn is higher at high frequen-

cies.

2. Wear on the horn is greater at high frequen-

cies.

3. Clean and at mating surfaces between the

horn, booster and transducer are more critical

at high frequencies.

Booster

The function of a booster is to alter the gain (i.e.

output amplitude) of the probe. A booster is am-

plifying if its gain is greater than one and reducing

if its gain is less than one. A neutral or coupling

booster is used to provide an additional clamping

location for added probe stack stability. A probe

designed to be mounted in a xture along with a

booster and horn is shown in Figure 6–2. This is

Probe

Housing

Booster

Horn

Figure 6–2 Probe Stack With Probe, Booster & Horn

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 145 146

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