A leading European producer of helical and spur tooth pinion gears has selected a GTG2 gear-grinding centre from Holroyd Precision to test-grind a range of specialised gears and tooth forms.
Developed purposely for grinding precision spur and helical gears, worms, screws and rotors of up to 350 mm diameter and 160 mm gear face width, Holroyd GTG2 grinding centres use what is described as a unique machining system to achieve accuracy to DIN 2 levels and beyond.
Steven Benn, Holroyd’s regional sales director, says: “The customer required a machine capable of grinding a variety of gears to exacting tolerances. Products to be manufactured include spur and helical gears; gears with end tip relief and root fillet radius; worm tooth forms such as ZA, ZI, ZK and ZN; worms with sunken tooth forms; and dual lead forms with both cylindrical and tapered roots. The GTG2 was selected for its versatility, reliability and accuracy – the latter achieved through high levels of on-board machine intelligence and a machining process developed to compensate for helical twist.”
Helical Twist occurs when helical gears are ‘lead crowned’ to improve meshing and reduce noise and wear. Lead crowning varies the amount of material removed from the flank of a tooth, across the face width, by causing the tool motion
to deviate from a true helix.
The problem is that ‘in-form’ grinding has the undesirable effect of causing the profile of the tooth flank to vary across the face. Particularly in high precision and low noise applications, this variation affects gear wheel performance by concentrating loads on particular areas of teeth during meshing.
GTG2 machines correct this problem by calculating and controlling additional motions of the wheel during the grinding operation using dedicated software written by Holroyd engineers.
For further information www.holroyd.com
To meet growing demand for ever more precise surface finishing in aerospace, Fintek has invested in a latest generation stream finishing machine from OTEC Präzisionsfinish GmbH.
“The new SF is particularly important for our aerospace work to ensure the precise profile tolerances now demanded for turbine blades are met,” explains operations manager Jamie Phillips. “For example, the control provided by the new step motor technology allows us to repeatedly change and lock the angle of the blades as they pass through the process media to carefully manage the finishing effect on vital leading and trailing edges.”
With six other stream finishing machines, along with drag finishing and centrifugal finishing systems, the AS9100 and ISO9001 accredited company says it has the capacity, depth of knowledge and expertise to provide a comprehensive range of surface finishing services. These range from deburring and mirror-finish polishing to smoothing and polishing, as well as important edge rounding. For aerospace, this offer covers not just turbine blades but complete blisks, gear wheels, cutting tools, fasteners and extremely thin parts.
“Problem solving is integral to our service,” says Phillips. “We work closely with aerospace customer engineers, including in research and development, to create better parts by applying surface finishing techniques that meet their commercial objectives. Often we’re able to achieve a quality of surface finish in minutes [sometimes seconds] that can’t be matched by hand or other traditional methods. Furthermore, processes are precisely repeatable to ensure total quality consistency and confidence to achieve surfaces with values down to Ra 0.01.”
For aerospace companies requiring on-site processing, Fintek is the exclusive UK agent for OTEC, and can supply and install machines.
For further information www.fintek.co.uk
Guyson International has created a universal automated blast system that is based on the company’s existing Multiblast RSB.
The latest system incorporates roof-mounted servo drives to provide saturation coverage from the attached blast guns across the entire rotating table, thus delivering full blast coverage to all components. Guyson’s universal automated blast system is aimed at subcontractors or manufacturers processing a varied component mix of geometric sizes and shapes with a requirement for cosmetic finishing, shot peening, general deburring, paint removal or aerospace MRO cleaning.
Featuring a standard blast chamber dimension of 1500 mm (wide) by 1500 mm (deep) by 900 mm (high), the cabinet is fitted with a large front-opening door, allowing easy parts-loading access to a 1 m wide, painted steel turntable (polyurethane version available).
The Multiblast RSB comes with two Guyson model 900 guns as standard, each with its own individual pressure regulator, allowing optimum blast coverage of components on the table. This number can be increased to a maximum of eight guns if the blast application necessitates. A blast-nozzle holding clamp option enables the guns to be swapped out for cleaning, while retaining gun position, stand-off distance and angle. Automated post-blasting air wash is also provided, as standard, to remove any blast media residues and leave the parts clean for any subsequent processing.
For optimum component blast coverage, the machine can be provided with either horizontal or vertical servo-driven gun drives. Both offer 500 mm of traverse, either across the turntable for full saturation coverage or vertically stroking (up and down) taller components to provide uniform coverage as the part rotates on the turntable.
For further information www.guyson.co.uk
Thanks to continued growth, Industrial Tooling Corporation (ITC) has taken delivery of an MX7 Linear grinding centre from Anca.
The MX7 Linear is the fourth Anca grinding centre acquired by ITC and the fifth such machine to arrive since the company extended its manufacturing facility by over 50% in 2016.
Able to process tools up to 300 mm long, with diameters up to 200 mm, the MX7 Linear uses Anca LinX linear motors and scales. LinX linear motors are said to offer higher axis speeds and acceleration, leading to reduced cycle times, while maintaining smoother axis motion. In addition, the machine has a permanent magnetic spindle that provides high torque at lower speeds, which is particularly important for carbide grinding.
Regarding precision, the Anca MX7 Linear incorporates a bi-symmetrical gantry design. Evenly straddling the tool centre line, the gantry delivers rigidity and resistance to thermal growth, while keeping vibration to a minimum. In addition, the MX7 Linear has been specified with automatic in-process measurement and compensation. The LaserPlus built-in laser probe measures tool geometries to within ±2 µm or less.
With respect to productivity, the latest arrival at ITC incorporates Anca’s FastLoad-MX automation system. The FastLoad-MX automation system uses the existing machine axes to ensure a compact design with a small footprint. Loader movements are kept simple, making it suitable for ITC to undertake the grinding of tools in small batch sizes.
This high-performance addition will enable ITC to increase its capacity and meet growing demand for its range of solid-carbide round tooling.
For further information www.itc-ltd.co.uk
Microdiamant has named Master Abrasives as its UK and Ireland representative for its range of diamond products, which are used for fine grinding, lapping and polishing applications.
Master Abrasives’ managing director Paul Batson says: “We identified diamond polishing products, such as diamond slurries and micron diamond powders, as an area which needed be added to our product range. At the same time, we were contacted by Microdiamant, who were looking for a UK partner. Microdiamant products are manufactured in Switzerland to high quality standards.”
For more than 60 years, Microdiamant has been continuously optimising and re-inventing micron diamond with customer needs as a constant focus. Microdiamant is a privately held company that distributes its products through a network of agents, with subsidiaries in approximately 20 countries across Europe, the USA and Asia. The company manufactures diamond products in all common diamond types – natural, monocrystalline, polycrystalline and nanocluster – and in sizes ranging from 18 nm up to 100 µm.
Microdiamant products available from Master Abrasives can be split into categories, the first being micron diamond powders for the superfinishing of hard materials. Micron diamond powders are offered in micron and sub-micron sizes, and in synthetic and natural diamond types.
In addition, Microdiamant offers diamond slurries for the lapping and polishing of hard materials, both in engineered and ready-to-use form. The ready-to-use diamond slurries combine precision graded micron diamond sizes with chemical formulations that are designed to offer high removal rates and surface quality. Microdiamant also provides liquid diamond GAFs, diamond compounds and grinding pads, composite polishing pads, and metallography products.
For further information www.master-abrasives.co.uk