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WHAT is ultrasonic assembly? |
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The basic principle of ultrasonic assembly is the conversion of standard 50/60 Hz power to 15 kHz, 20 kHz or 40 kHz. This electrical energy travels through a piezoelectric converter. |
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The converter, typically lead zirconate titanate, expands and contracts at the same frequency, converting the electrical energy into high frequency mechanical vibration. This vibration is amplified by a booster and transferred to the workpiece through a shaped tool, or horn, in the form of reciprocating longitudinal motion. Parts being assembled are clamped together under moderate pressure, at which point ultrasonic vibrations force the parts to impact against each other at a preset frequency creating a molecular bond equal to or above the material strength of the parts. Infinite and accurate combinations of weld time, weld energy established through a microprocessor, provide repeatable control of the process, and lend to the full automation of the assembly. Statistical process control and reporting are also possible with some models. |
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WHEN would you use an ultrasonic assembly process? |
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The most common application is the assembly of two injection molded thermoplastic parts. Ideally they should be of the same resins but in some cases dissimilar resins can also be bonded together. They can be either welded together using a variety of joint designs or they can be spot welded. But, we are not limited to only thermoplastic materials. We can also install threaded brass inserts into molded plastic bosses, stake plastic bosses over metal plates or printed circuit boards, swage over standing walls to entrap another component, perform continuous line seals on thin films and fabrics, seal the ends of collapsible squeeze tubes, accomplish perimeter seals on clam shell packages, spot weld corrugated plastic sheet in the manufacture of boxes, and much more. |
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WHERE would you use ultrasonic assembly? |
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Simply put, wherever two parts come together and one of them happens to be a thermoplastic resin. Following is a partial list of some of the industries we serve and typical applications for our process.
If you are not sure whether your application is suited for ultrasonic assembly, please rely on us. We are here to help you. Our applications lab is staffed with highly trained ultrasonic specialists whom you can call at any time for advice or information. They will evaluate your applications from parts, prototypes or blueprints, and provide you with prompt and knowledgeable recommendations. This no-cost, no obligation service includes feasibility engineering studies, design recommendations, and material guidance. |
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In addition to this service we also offer;
These in depth seminars on ultrasonic plastics assembly are conducted by Ultra Sonic Seal personnel on a regular basis at our corporate headquarters and in major cities throughout the United States. Customized, in-plant seminars can also be scheduled at your facilities. The purpose of these intensive educational and practical sessions, is to help current and prospective users of ultrasonic equipment enhance their operations, by improving the effectiveness of the process, from initial design and material selection to final assembly. Continually upgraded, they reflect both progress in technology and attendants’ specific requirements. Seminar information can be obtained through your local representative or through the Sales office.
Our technical bulletins are both comprehensive and informative, along with application information, and product data sheets are available through your representative or by calling the plant. Information includes data on design criteria, materials selection and assembly processes.
Sonic & Materials, Inc. manufacturers a complete line of titanium, aluminum, steel and monel ultrasonic horns for welding, staking, inserting and forming applications. Ultra Sonic Seal manufacturers standard and custom horns, including complex contoured and composites, nodal-mounted devices, and special wear-resistant horns. All Ultra Sonic Seal horns are designed and built with CARD® (Computer Aided Resonator Design). CARD® is a PC based software program that allows users to design ultrasonic horns to meet the unique specifications of their plastic assembly application. It is particularly useful in the design of low stress horns, horns with a specific gain, and horns with a specific node location.
Our application engineers are ready and willing to assist you with joint design, part configuration, material selection, and equipment recommendations to meet your part specifications and production requirements. We prefer to be involved from the start, but will jump in at any time you call on us.
This is one of our strong points. While we can not say that our machines never go down, we can promise you that if they do we do our utmost to get you back up and running. Many of our repairs are handled by verbal communication and UPS’ed replacement parts. On those occasions where this is not possible, we have the units sent in by next day service for priority repair. Most of the time, the units arrive in the morning, are repaired in the afternoon, and are then shipped out that evening. In a rare instance, we may be delayed until the next day. We know your production down time is costly and our goal is to keep it to a minimum through quality equipment and quick turnaround on repairs. |
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WHY would you use ultrasonic assembly? |
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Because it is the fastest, most repeatable and economical assembly method available to the industry today. With ultrasonics, most thermoplastics can be assembled without heat, mechanical fasteners, or hazardous consumables such as adhesives or solvents. It can join parts - small or large, simple or complex - with lower reject rates than any other method. Using ultrasonics, labor - both as a skill factor and as a time factor - is significantly reduced. And since the equipment can readily be automated, any non-technical operator can be trained in minutes to produce high volume, high integrity assemblies. |
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