Super Slim Design
In addition, when using a complicated workpiece design or a 5-axis control machining center, the workpiece may prohibit the nozzles of the external coolant to be in close proximity. If there is a coolant hole at the tip of the tool holder, the coolant can always be supplied near the cutting edge of the tool.
For more than 20 years a slim outer diameter has been an integral part of our hydrochuck’s design. However, with the increase of 5-axis control machining centers and multi-axis machining centers, a slender design is required to avoid complex work designs, jig interference, chuck interference, etc. The super slim model further reduces the outer diameter opening, adopts a tapered shape, provides excellent accessibility to the workpiece, and is easy to use in 5-axis control machining centers, multi-axis processing machines and microfabrication machines. Furthermore, if used for ball end mill processing, the hydrochuck needs to stand up to high-speed rotation. Our hydraulic chuck adopts a unique balanced hydraulic mechanism and further evolves in a super slim design, up to 30,000 revolutions for BBT 40 and HSK-A63 type, and up to 45,000 rpm for HSK-E32 type, highest for HSK-E.
Since the main body of the hydrochuck incorporates an internal hydraulic mechanism, it was difficult to place the coolant hole in the limited space of the tooling tip. However, we succeeded in establishing the world’s first jet-through coolant hole in a monolithic hydrochuck. Even when processing a mold with a ball end mill, coolant and oil mist are often supplied from the tip of the tooling to improve the tool life. The hydrochuck jet-through type is designed to be thinner than the previous hydraulic chuck, so it is easier to use even during mold processing where there tends to be holder interference. Hydrochucks have responded to a variety of needs for various machine tools as 5-axis control machining centers, multi-task machines and high-speed machines have become widespread. Hydrochucks are available in various designs for a range of applications, such as the super slim type for reduced interference, jet-through type to supply coolant from the tip of tooling, and the ultra-high precision model with runout accuracy of 1 μm for high-speed micro-machining.
Jet-Through Type
In modern machine tools, it is increasingly common to use through-spindle coolant delivery systems. Even with the increase in the number of cutting tools with oil holes, there are many requests to supply the coolant from the tip of the tool holder. The reason: it is difficult for the external coolant nozzle at the end of the machine spindle to accurately supply coolant to the cutting edge when a multitude of tools with varying lengths are changed by an automatic tool changer.
CONTRIBUTOR Masayuki Doi — BIG DAISHOWA SEIKI CO., LTD., Technical Headquarters Email: aw_tec@big-net.ne.jp
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