Explains Holroyd Precision sales manager Mark Curran: “A longstanding Holroyd customer, with nine of our machines in daily use, the business in question has traditionally rough milled then finish milled helical rotors, prior to ‘final’ precision-cutting. The finished profile shape is machined onto the cutter using a Holroyd CS 500 tool management centre. With a wide range of rotor types to manufacture, however, it became apparent they could benefit from making the switch to CNC rotor grinding. Needless to say, we are delighted that they have chosen Holroyd Precision to supply this technology.”
The machine will be shipped this month and installed at the compressor manufacturer’s Hiroshima facility in August 2017. It will be used to precision grind cast iron and stainless steel screw rotors of up to 350 mm in diameter, for use in industrial refrigeration units.
As a result, the company will benefit from higher levels of accuracy, speed and repeatability – primarily as a result of greater levels of automation and reduced set-up time. For example, where it can presently take the business up to 50 minutes to manufacture rotors of up to 120 mm in diameter by milling and cutting, Holroyd has been able to demonstrate a time saving of around 35 minutes.
A significant portion of the expected time saving results from the fact that, on Holroyd TG Series machines, diamond dressing wheels continuously dress during the cycle. By contrast, cutting tools require periodic re-grinding, depending on the materials and volumes being cut.
There are some 63 Holroyd profile grinding machines used by manufacturers around the world.
