i-mold has developed a line of compact rotary cooling units that facilitate the cost-efficient integration of rotating cores into injection molds. The device’s main components are a stator designed for twist-lock installation which also carries the coolant hose connectors, and the rotor which supports the cooling pipe as well as the thread for attaching the rotating core. Available as a standardized element, the unit reduces the development cost and effort otherwise associated with the use of custom solutions. Moreover, it eliminates problems in use caused by cooling water leaks, as each unit comes leakage-tested and warranted to be leakproof by i-mold.
For multi-cavity molds, it is possible to connect up to four rotary cooling units in series. Additional groups of four can then be arranged in parallel, paving the way to design compact molds with a large number of rotating cores. Thanks to this capability plus the advanced cooling performance that supports short cycle times, these devices help to increase manufacturing productivity. The new rotary cooling units are suitable for all common mechanical, hydraulic or servoelectric rotating core drives.
Depending on core dimensions and cooling power needs, the unit is offered in two sizes. The SDK-034, rated for a 2 – 6 mm cooling pipe diameter, supports particularly close cavity spacings of only 34 mm thanks to its compact stator design. The 45-mm-wide SDK-045 is intended for higher coolant flow rates and accommodates cooling pipes measuring from 6 – 10 mm in diameter. The default cooling pipe length is 300 mm with customized lengths being available on demand. The core attachment thread may be either metric fine or inch-type.
For connecting the coolant hoses, i-mold’s new rotary cooling units come with standard plug-in couplings. Quick-acting couplings are also available as an option. The minimum bending radius of the coolant hoses depends on the material required for the given temperature range. It is equal to 35 mm for coolant temperatures up to 60 °C, 50 mm for temperatures up to 80 °C, and 90 mm for hoses rated up to 120 °C. The maximum operating pressure is 10 bar. A suitable coolant is filtered water, with a filter fineness of 0.05 mm or below.
Andy Walter, Managing Director, comments: “With our new compact rotary cooling units we make a reliable standard device available to our customers in injection mold making which can significantly save in-house development effort without compromising on flexibility in rotating core design. Being convinced of the quality of our new products, we ourselves use them for our servo-motor based system solutions including fully assembled plug-and-play unscrewing halves with their associated control system.”