A leading British manufacturer of orthopaedic implants and surgical instrumentation has recently installed a Guyson MultiblastÂ® RSB blast machine for cleaning off Hydroxyapatite and Titanium coating â€˜oversprayâ€™ from its cup and stem implant fixture masks, which become encrusted with coating when its medical implants undergo Vacuum Plasma Spraying.
Online PR News – 01-September-2011 – – A leading British manufacturer of orthopaedic implants and surgical instrumentation has recently installed a Guyson MultiblastÂ® RSB blast machine for cleaning off Hydroxyapatite and Titanium coating â€˜oversprayâ€™ from its cup and stem implant fixture masks, which become encrusted with coating when its medical implants undergo Vacuum Plasma Spraying. This automated blast cleaning process also has the added advantage of removing a time consuming and arduous manual blasting process from the workplace.
The company turned to Guyson, the industrial finishing equipment manufacturer, for a solution as it was looking to improve throughput on a manual blasting operation, which was acting as a bottle neck in its production routine. The cleaning process was being undertaken using a suction fed manual blast cabinet and could take anything up to thirty minutes to clean each fixture mask free from overspray, prior to it being reused. The fixture mask is used to hold the component and at the same time mask a selected area whilst the component is thermal sprayed with either Hydroxyapatite or Titanium coatings.
Blast trials on the fixture masks were undertaken at Guysonâ€™s development workshop at Skipton and the automated MultiblastÂ® RSB (Rotating Spindle Blast) system was selected as the most appropriate replacement machine. The process now achieves a perfect clean finish in the required time, with virtually no operator involvement apart from load and unloads, leaving the operator to perform other duties.
Internally the Guyson Multiblast RSB machine is fitted with a specialised 14 station planetary component drive, supplied by T & T Automation based in Rotherham, and two vertically traversing pressure fed blast nozzles which can now undertake the cleaning process in a fraction of the time per unit, to a consistent, uniform standard and deliver 14 clean components at one go.
The coated fixture masks are manually loaded into their own component holders on the turntable, in the centre of the rubber lined blast chamber. The door is closed and the blast process begun. The turntable starts to rotate clockwise, whilst each of the 14 component holders in turn rotates on its own axis. The fixture masks rotate at a controlled, adjustable speed and are blasted from the two blast nozzles which vertically traverse up and down the component, at a pre-positioned angle and distance to achieve overall coverage of the target surfaces, whilst they rotate under a constant stream of Guyson glass bead blasting off the oversprayed coating, yet not damaging the fixture mask themselves.
Once the blast cycle is finished, an integral air knife blows of the residual dust from the components and they are unloaded to be reused. A new set of coated fixture masks are then loaded to undergo processing.
This MultiblastÂ® system in common with most automated shot blast systems manufactured by Guyson is fitted with a PLC/HMI. This gives full operational control over virtually all machine variables and enables through a simple menu system for a â€˜recipeâ€™ to be set-up with differing process requirements such as traverse, oscillation and airwash speed, start and finish gun positions etc. These â€˜recipesâ€™ can be recalled and used to speedily reset-up the machine so as to enable a range of varied components to be processed in a repeatable fashion.
The pressure blast system encompasses a Guyson G55 (55 Litre) Pressure Pot, which delivers a powerful blast media supply to the two blast nozzles. The pot is fitted with low level media sensor, which ensures that there is enough media in the pot to complete a blast cycle and that another is not undertaken until the pot is refilled above this level.
The pressure pot is mounted in a sound insulated tower configuration, below a Polyurethane lined (for wear protection) CY600/16 Cyclone Separator; this item is specified where a consistent quality finish is demanded. The cyclone separator creates a vortex of air that carries the heavier re-usable particles to the outside of the rotating air stream and then down into the pot to be reused. Whilst the lighter remaining dust, fines and undersize media, flows into the inner tube, and this dust-laden air is sent to the dust collector.
Completing the blast system in a typical unit is an efficient reverse jet pulse cleaning dust collector. The dust collector being matched to the operational capacity anticipated and takes account of the volume of air fed into the system, the chamber dimensions, workflow, media type and break-down rate.
Prospective user of Guyson manual or automated blast systems are encouraged to submit sample components for free feasibility testing to the companies extensive development workshop at Skipton, England.
Guyson International Limited is a privately owned family company with a world-wide reputation for excellence in the design and manufacture of blast finishing, spray wash and ultrasonic cleaning equipment. Formed over 70 years ago, the company is registered to BS EN ISO 9001:2008 and its head office is located at Skipton, North Yorkshire, in the north of England. Guyson has four international subsidiary companies: Guyson Corporation of the USA, located in Saratoga Springs, New York State; Guyson SA, situated in Paris, France; Guyson Sdn Bhd in Penang; and Guyson CN, in Wuxi, Jiangsu Province, China.