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Delivering Precision For Rotor Grinding In China

Thanks to the technologies of Holroyd Precision, a major industrial group in Northern China will soon embark on the production of its own range of air ends, helical rotors and screw compressors.

In an order secured this month, and valued in excess of £1.4 million, Rochdale-based Holroyd Precision is to supply one of its advanced helical rotor and thread grinding machines to the organisation. The machine, a Holroyd TG 350E, will be delivered in early 2019 and will be used by the customer to precision-grind helical components of up to 350 mm in diameter and 1795 mm in length.

“We are delighted to have secured this significant order,” comments Holroyd Regional Sales Director, Steven Benn. “Although for commercially sensitive reasons, we cannot name the customer, it is particularly rewarding to know that in their quest to achieve the highest levels of precision in rotor manufacture, they recognised the uncompromising levels of accuracy that our technologies offer.

“As we are members of the Manchester-China Forum,” he continued, “securing this significant order also underpins our ongoing drive to strengthen ties between the city region and China.”

TG Series: setting the industry standard

Holroyd’s TG Series of multi-purpose grinding machines has long set the standard for high levels of accuracy and efficient stock removal. The TG range starts with the TG 50E, a machine designed to precision grind components of up to 50 mm in diameter and 610 mm long, with models offering stepped increases in capability up to the production of helical components measuring 350 mm in diameter and 2020 mm long. Equally suited to prototyping, batch and volume production, TG Series machines are designed primarily for the finish grinding of helical screw components such as worm screws and rotors after they have been milled to a rough or semi-finished state. TG models offer production rates and accuracies to suit precise manufacturing strategies. Fully automated on-machine probing provides closed loop feedback of corrections to the dresser wheel and does not require a high level of operator skill.

TG Series grinding machines, at-a-glance:

  • Accelerated and simplified set-up
  • Fully automated grinding wheel balancing system
  • Powerful, menu-driven touch screen programming
  • Unique on-board Holroyd 3D CMM component scanning probe
  • High-power, high-speed grinding spindles
  • Optional hollow spindle for longer components
  • Advanced in-process dressing systems
  • Large diameter grinding wheels, for maximum wheel life
  • Optional Holroyd Profile Management System for profile development and control
  • Maximum component diameter from 3 mm to 450 mm, depending on component profile
  • Maximum component weight 500 kg

PTG. The first name in precision

Incorporating the brands of Holroyd and Holroyd Precision Rotors, PTG has established itself at the forefront of high-precision machine tool design, build and supply for specialised applications. The Holroyd range includes advanced machine tools for the production of complex helical components such as compressor rotors, pump screws and high-accuracy gears, and machine tools for friction stir welding advanced alloys used in transport applications. With production facilities in the UK, USA and China, Holroyd Precision Rotors manufactures the special purpose, ultra-precision helical components used in a wide range of industries, including refrigeration, air-conditioning, gas and vacuum pumping, industrial air handling, aerospace, medical equipment, motion control, power transmission, power generation, oil & gas, fluid transfer and high-end automotive. PTG also provides advanced technical consulting services.

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