Keep your rotor running

Keep your rotor running
Keep your rotor running

When one of Taiwan's leading air and refrigeration compressor specialists required additional rotor milling capability it opted for a 3EX-R rotor production centre from UK-based Holroyd Precision.

Having invested in several rotor milling and grinding machines over recent years from Holroyd, a Precision Technologies Group company, the customer knew it would receive both the technology and support necessary to meet its demanding manufacturing strategies.

Installed in August 2015, the 3EX-R has equipped the customer with performance and reliability for rough milling rotor blanks of up to 350mm in diameter.

“We were incredibly pleased to secure repeat business from such a longstanding and valued customer,” comments PTG group business development director, Neil Jones. “Over recent years we have supplied this client with three rotor milling machines, a TG350 grinding machine and a tool management centre. Being more than familiar with the uncompromising standards offered by our machinery, they did not wish to take a chance on performance, repeatability and productivity by selecting an alternative solution.”

Holroyd EX CNC rotor production centres offer high-speed, high precision and robust build quality. Standard EX rotor production centres can cut rotor or worm helix profiles in blanks of as little as 50mm to 850mm in diameter. Where 850mm diameter milling is not sufficient, Holroyd also build a bespoke model designed for blanks exceeding 1m in diameter.

3EX-R rotor production centres such as that chosen by the Taiwanese customer, provide optimum levels of power and torque for accelerated performance when milling larger diameter components. To further improve the performance, 3EX-R centres also incorporate an enhanced workhead and cutter head.

All Holroyd EX high-speed rotor production centres offer high levels of performance and repeatability – due in no small part to advanced technology and the company's development of on-machine probing and dry milling techniques. The flexibility of the EX Series also means all derivatives are efficient at producing complex components with helical screw profiles, as well as gear parts such as worm shafts.

Holroyd EX centres cut a full-depth groove by traversing the cutting tool through the material at the relevant helix angle, whilst at the same time rotating the component in the C-axis. Accurate synchronisation between the axes is maintained via CNC, with digital drive technology controlling all axis movements. The cutting head is able to remove so much material in one step because the majority of heat generated is transferred to the swarf chips. These are then removed from inside the centre by means of a conveyor system.

Holroyd milling machines have always been designed with the power and rigidity required for rough cutting operations and the accuracy and precision needed for finish profile milling. This technique is the preferred process when machining steep sided profiles and also for components that are manufactured in materials such as aluminium. PTG

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