Single point grinding of skiving tools

Single point grinding of a skiving tool to quality 2 to 3 being demonstrated on a Haas Schleifmaschinen grinder at EMO 2021
Single point grinding of a skiving tool to quality 2 to 3 being demonstrated on a Haas Schleifmaschinen grinder at EMO 2021

On the Haas Schleifmaschinen stand at the EMO exhibition last year, the grinding machine manufacturer demonstrated on one of its Multigrind machine platforms the single point grinding of a skiving tool to such close tolerances that it is able to produce gears to quality 2 to 3.

The accuracy class when skiving gears is traditionally 4 to 6. Sole sales and service agent for Haas Schleifmaschinen in the UK, Irish, and Gulf markets is Kingsbury.

Wolfram Hermle, software department manager at Haas Schleifmaschinen says: "Today, dimensional tolerances of 2µm are not uncommon. The production of such accurate profiles requires highly complex calculations. If we want to have that under control, we have to do the maths ourselves."

Two years ago, when the project to develop the required software was initiated, there was no satisfactory method on the market for determining machining cycles to achieve the ever increasing gear precision being demanded by industry. The goal was to create a system for calculating cycles for machining the wide variety of gears that need to be produced.

The Haas Schleifmaschinen grinder control screen
The Haas Schleifmaschinen grinder control screen

Mr Hermle does not want to divulge details of the newly developed calculation model in Haas Schleifmaschinen's Multigrind Horizon software, but confirms that gears of accuracy class 2 to 3 can be achieved. However, he pointed out that it is only one element of the process; the other being the high precision the grinding machine must be capable of achieving. Alignment of the grinding wheel must be accurate to 0.0001°.

Crucial to achieving the desired grinding performance are continuous dressing of the grinding wheel and high-level measuring technology, with constant automatic workpiece measurement and closed loop compensation of errors.

Mr Hermle concludes: “As far as I know, this accuracy is achieved exclusively using Haas Schleifmaschinen production solutions. Only when software and hardware are perfectly matched can a skiving tool be created for manufacturing a perfect gear."

Kingsbury
www.kingsburyuk.com

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Kingsbury UK

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