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Hydraulic cylinders produced on cnc turning centres

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article image Hydraulic cylinder produced on a cnc machine fitted with a production dynamics full bore collet chuck.

DIMAC Tooling has released a new production dynamics full bore collet chuck that has been used to increase the capacity of hydraulic cylinder production machinery.

The production dynamics full bore collet chuck is a self contained, mechanical grip, air released collet chuck.

The collet chuck was recently installed by QMN Manufacturing to increase the capacity of their eight cnc turning centres. Previously, the turning centres were capable of machining chrome bars to only 70mm bore sizes, but after the installation of the chuck, the same machines were able to machine 82mm bore sizes.

The way in which the bar is held in fast full bore collet chucks has an effect on machining time, accuracy and repeatability of the operation. The actuation, typically in less than 1s, allows the bar stock to be advanced without stopping the spindle, which reduces the cycle time compared with traditional tooling.

The full bore chucks also enable use of the spindle capacity by eliminating draw-tube components, true diameter length positioning and open on-the-fly-capacity at any turning speed.

The mechanical grip, air actuation does not require any external actuators since the actuator is built in. Air is used only to open the chuck as spring force holds the work piece while it is being machined.

The part remains clamped even if the air pressure is lost while the clamping force is easily adjustable by using the spanner holes in the front of the collet.

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