Cath-Tip is here to serve you
Discover innovations that will improve your productivity, success rate and production capabilities through our new TIPS newsletter. About twice a month we’ll be bringing our knowledge base to your inbox: success stories, case studies, how-to videos, exclusive discounts, product developments, equipment benefits, software updates, service offerings, upgrades and time-saving features. Check out our video on Closed-Loop Force Control – solving variability in motion, position and pressure; and read about the benefits of Coil Design to learn how to have the best, high quality heating process. Then tell us how we can help you.
Closed-loop feedback and control
Complete with closed-loop feedback and control, our loaded Magnums are equipped for ultimate tipping results.
Force control minimizes process variability in motion, position and pressure. Choose your force set point up to 25 pounds or set a force pre-load for consistent high-quality production. Set yourself up for success.
Contact us today about your project:
email firstname.lastname@example.org or call 435-628-1775
Coil Design Increases Machine Flexibility
Having a flexible tipping machine provides long-term value
As technology and the medical industry advance, so do medical devices. Timing is critical when new opportunities arrive. Having a flexible machine and knowing the basics of coil design are key to begin working on new projects as soon as possible. In this article the basics of RF induction, coil design and coil alignment will be discussed.
Success in induction heating is greatly dependent on the design of the work coil, also known as heating coil. Heating coils can be made in a variety of types and styles depending on the shape of the metal surface to be heated. Cylindrical coils are most commonly used at Cath-Tip, since the surface of the dies employed are also cylindrical.
Two types of cylindrical coils are used depending on the needs of the application: axial and radial. Axial coils can be one turn or multiple turns, depending on whether heat needs to be concentrated or spread over a wider area. The copper tubing OD used to make the coils is either .0625¨ or .09375¨, depending on the size and geometry of the part being formed, as well as the polymer. The spacing for a radial coil should be .09¨ and the spacing between axial turns should be about .03¨, but no less. It’s important that the tubing does not kink in order to allow water flow. Plastic barbed fittings are attached using epoxy to connect water lines.
Another critical feature in coil design is “coupling” – the spacing between the inside diameter of the coil and the outside diameter of the die. The spacing for most applications should be as close as .03, but no less. This spacing gives the most efficient energy transfer to the surface to be heated. In special applications where deeper penetration is required to melt thicker material, a wider spacing up to .125¨ could be used. Heat time and power output must be adjusted accordingly to allow for needed heat transfer.
Now that the different types of coils and the importance of coupling have been discussed, installation and alignment will be addressed. When a coil is installed it must be centered to the die, uniform spacing all around the die. Coils are made out of copper and can be gently tweaked to make sure that they are centered after using the coil extension arms for horizontal and vertical alignment. Even gaps between each turn must be maintained.
In conclusion, coils are a key component to heat induction and it’s important to keep them aligned and centered to the die. Copper is delicate and coils can bend easily, so it’s always good to have a back-up. Knowledge of making coils will allow for production to be maintained even in the event of an emergency. It further enables independence to quickly get started on new R&D projects that require a different size coil.
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Let us know if you need back-up or replacement coils and also make sure to look for our next newsletter on “Coil positioning for quality tips.” The ability to simply make new coils is one feature that keeps our machine flexible and capable of tip forming, bonding and flaring parts of diameters from .03¨ to .5¨.
Contact us about your project: email email@example.com or call 1-435-628-1775