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Haas has announced its plans to exhibit four of its advanced machining platforms at the Grindtec event, to be held near Munich from 17-20 March.

The latest Haas Multigrind CB machine is designed for the flexible and universal machining of components, such as aero-engine turbine blades, blisks and vanes, and enables complete machining – including all milling, grinding and production belt-grinding operations.

By combining all of these processes in one automatic operation the most flexible solutions are available and, as each operation is carried out automatically and as the aero-engine blades are only clamped once, the highest possible precision is guaranteed.

The Haas automatic tool-changer and part-loader systems also allow for unmanned operation.

The machines are equipped with full automatic probe systems to measure blade profiles to determine the spatial position of blade castings, as well as worn blade profiles, prior to grinding and linishing for refurbishment work.

The Haas CB production machine has a general capacity to handle blades of up to approximately 1,000mm in length and its automatic tool changer allows for milling heads, grinding wheel sets and belt-grinding heads to be automatically changed at will to combine all necessary machining processes in one fully automatic operation.

The latest generation of high-speed dressable CBN wheels are used in conjunction with an in-process constant wheel dresser that can dress up to two grinding wheels simultaneously during the actual grinding process, with constant feedback of the wheel dimensions for automatic wheel-wear compensation.

The use of the constant wheel dresser means that grinding wheels are kept in the best possible condition at all times and there is no downtime that is associated with having to continually move the wheels to a table-based dresser device for regular wheel dressing.

The ability to interpolate all five of its major machining axis at the same time enables complex blade profiles to be milled and ground with ease, with the resulting highly precise form also being further generated by the optional belt grinding heads.

Chris Boraston, managing director at Dorman, explained that after the four- or five-axis milling operations on the Haas CB machine, followed by the subsequent high precision grinding operation, aero-engine blades can be automatically belt ground in a single operation without having to remove the blade and then remount it on a conventional linishing machine.

‘All belt grinding on the Haas CB machine is carried out wet using the oil as used for the previous milling and grinding operations.

‘The wet belt grinding process is far superior to a dry process as it generates a considerably better surface finish when using identical grades of belt but also avoids the creation of any heat buildup that could damage or otherwise adversely affect the perfectly ground finishes previously created by the Haas machine.’ As all of the Haas machining processes – milling, grinding and belt grinding – follow the exact CAD component files, upon which the machine’s NC programs are automatically generated, end users are assured that exactly the precise blade form required is machined.

Due to the use of the tool-changer belt heads are also automatically exchanged, allowing an automated two- or three-step fine belt grinding process using different grades of belt without any operator intervention.

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