May, 2016


www.us- tech.com Reliable Soldering for Medical Equipment Continued from previous page


for mass production. An ultrasonic method enables soldering without acid flux. Due to flux’s acidic activa- tor, its use in medical devices is fre- quently avoided, especially if the product will be in contact with the human body. There are few operators with


the skills to satisfy these strict requirements, and to develop the level of expertise is time-consuming and expensive. The solution is to con- vert the skill of outstanding opera- tors to robots; robotic soldering is


tries. Products for Asian markets are often produced in Singapore. Besides the U.S., advanced medical electron- ics manufacturing technology is cre- ated in Europe and Japan, and Japan Unix is one such company. Process development and tech-


nical support are critical for robotic soldering. Japan Unix has estab- lished an extensive network of global partnerships to provide technical and sales support. The company invests heavily in these people and organizations to develop experts for customers to rely on. The company is committed to providing world-class robotic soldering technology and maintaining a reputation of manu-


facturing competitiveness. A case in point: wire-shaped


products, such as catheters, are diffi- cult to fix in position during process- ing, which makes them hard to sol- der. The company has created special “jigs” for robotic soldering. These fix- tures have been derived from previ- ous designs or similar items and allow the robotic systems to handle them correctly. The company has established a


soldering school to educate engineers and technicians who scientifically analyze soldering results. In addi- tion, the company has been appoint- ed as the exclusive partner of IPC, the global standard for the electron-


ics manufacturing industry. IPC develops specialized standards for medical electronics in order to main- tain a consistently high level of qual- ity in the products. As a result, the company receives daily soldering sample requests from customers and works to expand these global stan- dards. Contact: Japan Unix Co., Ltd.,


107-0052 Tokyo Minatoku, Akasaka 2-21-25 % +81-3-3588-0551 E-mail: yusaku@japanunix.com Web: www.japanunix.com r


See at NEPCON China, WKK Booth 1F40


Page 63


Bright


UNIX-DF series robotic soldering system has six axes of movement for accurate control of its insertion angle.


seen as an effective manufacturing process, and its application in manu- facturing medical electronics is becoming more popular.


Cavitation Effect from Ultrasonic Waves


Another technique utilizes


ultrasonics as part of the soldering operation. When ultrasonic vibra- tions are applied to a liquid, small bubble-shaped cavities are produced due to amplitude pressure differ- ences.


This phenomenon is called “cav-


itation.” The cavities are collapsed by atmospheric pressure, generating a large amount of energy. Ultrasonic soldering uses the momentary ener- gy produced by cavitation to remove oxides on a material’s surface. In an ultrasonic soldering sys-


tem, a heated iron tip emits ultrason- ic vibrations of 60kHz. The waves generated from the oscillator are transferred to the soldering tip by a horn. The cavitation effect of the ultrasonic waves produces vacuum cavities (bubbles) at the interface of the substrate and the molten solder. Recent RoHS directives and


environmental regulations have resulted in the reduced use of flux, a material which contains strong acids. The reaction layer (diffusion layer) formed during ordinary soldering is also formed in ultrasonic soldering after removing the oxide surface by the cavitation effect, thereby reduc- ing the need for flux.


Equipped for the Medical Sector In terms of medical equipment,


the United States is highly ad - vanced. The majority of U.S. manu- facturers produce large medical measurement devices, while general equipment is manufactured in facto- ries in Puerto Rico, the Dominican Republic and other Caribbean coun-


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See at NEPCON China, Booth 1J50


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