GB2545956A - Vibro-Polishing Arrangement - Google Patents

Abstract

An arrangement for vibro-polishing one or more components, the arrangement comprising a container (60) comprising vibro-polishing media, an agitator to agitate the vibro-polishing media (78) relative to the container, and a fixture (30) comprising at least one member which extends around one or more components (50) for insertion into the vibro-polishing media. Each member of the fixture works to define an opening which is sized to prevent any further fixture or partition from contacting the or each component. The container may further comprise one or more partitions (66) extending substantially across the container so as to provide two or more sectors within the container. The vibro-polishing media may comprise liquid or solid components and the partitions may comprise opening sufficiently large to allow the vibro-polishing media through but sufficiently small so as to prevent the fixtures from passing through. The partitions can further be arranged to rotate, in use, within the vibro-polishing media.

Description

Vibro-Polishing Arrangement

Field

The present disclosure relates to an arrangement for vibro-polishing one or more components. In particular, but not exclusively, the present disclosure relates to an arrangement and fixture for the containment of a component during a vibro-polishing process so as to prevent components, in use, from contacting one another.

Background

Vibro-polishing is known for the surface improvement of metallic components such as, for example, aerofoils, discs, drums, bladed discs and bladed drums. In particular, vibro-polishing, also known as vibratory finishing, is typically used to deburr, radius, descale, burnish, clean and brighten components or parts which require such surface improvement.

In vibro-polishing, specially selected pellets, shot or tokens of media of a particular geometry, material and/ or hardness are placed into an appropriately sized container. Components requiring treatment may then be placed into, or suspended within the media before the entire container, containing both the media and one or more components for treatment, is vibrated. In this way, vibro-polishing media may move relative to and/ or against one or more surfaces of a component so as to rub or frictionally interact with the component in areas of the component accessible to the media. In particular, the abrasive nature of the material may cause a localised removal from the tips of any outwardly extending asperities, so smoothing the component or bringing about a material removal. As such, the media may interact with external or internal features of a component, such as holes or recesses, where active movement of media through or against the component is made possible.

The process may work solely through interaction of the vibro-polish media with the component, or may alternatively be assisted by combining the action of the vibro-polish media with a further chemically-based medium to at least partially assist in the material removal process. In such an instance, the process may be referred to as chemical vibro-polishing, or CVP. Such fluids may alternatively aid in lubricating the media or component, so aiding in the provision of a gentle removal process and/ or enhanced longevity of the vibro-polish media. Additionally or alternatively, the chemically-based medium may instead aid in at least partially breaking down a surface oxide or surface layer of the component, thus assisting in material removal. Thus, the process may be either wet or dry.

In use, the container is commonly vibrated by an eccentric, rotating weight shaking the container in a circular path. In such an action, and upon rotation of the weight, the entire load is lifted up at an angle and is subsequently released such that the container may return to its resting position, thus defining an amplitude and frequency of vibration. In such a movement, the container returns to an upward position applying an upward and angular force, so causing a shearing action such that the part and media may rub against one another. Due to relative movement between the media and the component, it is also known that the larger the pellets, shot or tokens comprised within the vibro-polishing media, the faster the cutting action, and the quicker the rate of material removal.

Despite vibro-polishing being a known process, little research has been conducted into refining methods for supporting the component during processing or advancing manufacturing processes. In accordance with the above, there are a number of associated problems and known disadvantages with the presently available methods of vibro-polishing which render the process unsuitable for certain applications. Accordingly, fixed processes only allow a specific number of components to be attached to a fixture, thus leading to reduced efficiency for a large number of small components. For this reason, fixed processes are predominantly associated with the treatment of large components. The process also requires a large amount of processing time in order to mask components, clamp components and subsequently remove components from the fixture.

Traditional free flow polishing methods are also associated with drawbacks including increased cycle time, variation of material removal between components and/ or treatment locations, for example, between the inner and outer vanes on cluster vanes, and the potential for component interaction during processing. Furthermore, modified ‘fixed’ vibro-polishing methods provide certain disadvantages, including high cost of fixturing and component masking, large amounts of processing time in order to mask components, clamp components and subsequently remove components from the fixture, high noise levels due to transfer of vibrations from the component to the fixture, and health and safety risks due to the localised thinning of the fixture, giving rise to knife-like sharp edges as processing continues.

It would therefore be advantageous to provide an improved fixture and arrangement for the vibro-polishing of a component without the aforementioned disadvantages.

Statements

According to a first aspect, there is provided an arrangement for vibro-polishing one or more components, the arrangement comprising a container for containing vibro-polishing media, an agitator to agitate the vibro-polishing media relative to the container, one or more partitions extending substantially across the container so as to provide two or more sectors, and, a fixture comprising at least one member which extends around one or more components for insertion into the vibro-polishing media, each member defining an opening which is sized to prevent any further fixture or partition from contacting the or each component.

Thus, in this way, the arrangement prevents, in use, further components and/ or partitions from contacting the component comprised within the fixture. Thus, the arrangement provides, in use, continuous flow of vibro-polishing media over the surface of the component.

Thus, the arrangement provides ability, in use, to segregate components comprised within respective fixtures by placing each component in a different sector of the container. According to a second aspect, there is provided an arrangement for vibro-polishing one or more components, the arrangement comprising a container for containing vibro-polishing media, an agitator to agitate the vibro-polishing media relative to the container and, a fixture comprising at least one member which extends around one or more components for insertion into the vibro-polishing media to prevent any further fixture or partition from contacting the or each component.

According to a third aspect, there is provided an arrangement for vibro-polishing one or more components, the arrangement comprising a container for containing vibro-polishing media, a fixture comprising at least one barrier which extends around one or more components for insertion into the vibro-polishing media to prevent any further fixture or partition from contacting the or each component.

Optionally, each member may comprise an arm. The member may be referred to as a barrier.

Thus, in this way, the arm may be either disassembled or removed from the fixture. Thus, the arm may be of reduced cross-section relative to the fixture. As such, the arm may provide minimal resistance to vibro-polishing media flowing around the respective parts of the fixture before flowing over the surface of the component.

Optionally, the depth of the or each partition may be at least substantially equal to the depth of the vibro-polishing media within the container.

Thus, in this way, each partition may encapsulate the entire sector.

Optionally, the or each partition may comprise one or more openings.

Thus, in this way, one or more of the vibro-polishing media components may be allowed to freely flow between the two or more respective sectors.

Optionally, the vibro-polishing media may comprise one or more solid components.

Thus, in this way, the vibro-polishing media may provide one or more of a cutting, abrasive or lapping action through interaction of the or each solid component comprised within the vibro-polishing media with the component for treatment. More regularly, the vibro-polishing media may comprise many such solid components, thus improving interaction between the component for treatment and the solid components comprised within the vibro-polishing media. Accordingly, the rate of vibro-polishing is improved relative to the number of solid components comprised within the vibro-polishing media.

It will also be appreciated that any such media providing one or more of a cutting, abrasive or lapping action through interaction of the or each solid component comprised within the vibro-polishing media with the component for treatment may be suitable for use. Thus, semi-solid or porous materials may also be used.

Optionally, the vibro-polishing media may comprise one or more liquid components.

Thus, in this way, the liquid component may provide added either lubrication and/ or chemical assistance to aid in the vibro-polishing process.

Optionally, the or each opening within the or each partition may be larger than the or each vibro-polishing media component to allow the vibro-polishing media to traverse between partitioned sections.

Thus, in this way, vibro-polishing media may freely flow between the two or more respective sectors, the partition providing minimal resistance to vibro-polishing media flowing around the respective parts of the partition.

Optionally, the or each opening within the or each partition may be sized to prevent the or each fixture from traversing between partitioned sections.

Thus, in this way, whilst vibro-polishing media may freely flow between the two or more respective sectors, the openings are sized to prevent the or each fixture from traversing between partitioned sections. Thus, each fixture is maintained, in use, in the sector it was placed in.

Optionally, the or each partition may comprise a mesh.

Thus, in this way, the mesh is configured to provide minimal resistance to vibro-polishing media flowing around the respective parts of the mesh, whilst providing the structural integrity to prevent the fixture from traversing between partitioned sections.

Optionally, the or each partition may be arranged within the container so as to rotate, in use, within the vibro-polishing media.

Thus, in this way, the vibro-polishing process may be assisted by the partitions rotating, and thus providing an at least partially drag assisted vibro-polishing process.

The skilled person will appreciate that except where mutually exclusive, a feature described in relation to any one of the above aspects may be applied mutatis mutandis to any other aspect. Furthermore except where mutually exclusive any feature described herein may be applied to any aspect and/or combined with any other feature described herein.

Brief Description

Examples will now be described by way of example only, with reference to the Figures, in which:

Figure 1 is a sectional side view of a gas turbine engine;

Figure 2 shows an isometric view of a disassembled fixture and mask for the containment of a component during processing;

Figure 3 shows an isometric view of a disassembled fixture, mask and component for the containment of a component during processing;

Figure 4 shows a frontal view of an assembled fixture, mask and component for the containment of a component during processing;

Figure 5 shows a cross-sectional view of a vibro-polishing container and partitioning arrangement;

Figure 6 shows an isometric view of a vibro-polishing container and partitioning arrangement;

Figure 7 shows a side-view of an assembled fixture, mask and component for the containment of a component during processing during interaction of the fixture with the partitioning arrangement; and,

Figure 8 shows an isometric view of an assembled fixture, mask and component for the containment of a component during processing during interaction of the fixture with the partitioning arrangement, in accordance with an example of the present disclosure.

Detailed Description

With reference to Figure 1, a gas turbine engine is generally indicated at 10, having a principal and rotational axis 11. The engine 10 comprises, in axial flow series, an air intake 12, a propulsive fan 13, an intermediate pressure compressor 14, a high-pressure compressor 15, combustion equipment 16, a high-pressure turbine 17, an intermediate pressure turbine 18, a low-pressure turbine 19 and an exhaust nozzle 20. A nacelle 21 generally surrounds the engine 10 and defines both the intake 12 and the exhaust nozzle 20.

The gas turbine engine 10 works in the conventional manner so that air entering the intake 12 is accelerated by the fan 13 to produce two air flows: a first air flow into the intermediate pressure compressor 14 and a second air flow which passes through a bypass duct 22 to provide propulsive thrust. The intermediate pressure compressor 14 compresses the airflow directed into it before delivering that air to the high pressure compressor 15 where further compression takes place.

The compressed air exhausted from the high-pressure compressor 15 is directed into the combustion equipment 16 where it is mixed with fuel and the mixture combusted. The resultant hot combustion products then expand through, and thereby drive the high, intermediate and low-pressure turbines 17, 18, 19 before being exhausted through the nozzle 20 to provide additional propulsive thrust. The high 17, intermediate 18 and low 19 pressure turbines drive respectively the high pressure compressor 15, intermediate pressure compressor 14 and fan 13, each by suitable interconnecting shaft.

Other gas turbine engines to which the present disclosure may be applied may have alternative configurations. By way of example such engines may have an alternative number of interconnecting shafts (e.g. two) and/or an alternative number of compressors and/or turbines. Further the engine may comprise a gearbox provided in the drive train from a turbine to a compressor and/or fan.

As part of the manufacturing stage of a number of components comprised within the assembled gas turbine engine 10 such as, for example each of the components used in the assembly of the propulsive fan 13, intermediate pressure compressor 14, high-pressure compressor 15, combustion equipment 16, high-pressure turbine 17, intermediate pressure turbine 18, low-pressure turbine 19 and an exhaust nozzle 20. It will also be appreciated that any such appropriately sized component requiring surface improvement may be treated by using any number of processes or surface improvement/ processing methods during manufacture and/ or repair. One such process may include vibro-polishing, in particular vibro-polishing using the arrangement as shown in figures 2 to 8.

Figure 2 shows an isometric view of a disassembled fixture 30 and masking arrangement 32 for the containment of one or more components during processing including, for example, vibro-polishing. In particular, the masking arrangement of figure 2 shows two masking units 34, the units 34 comprising a recessed portion 36 suitable for receiving either a component, or a specific region of one or more components within the radially inner surface of the masking unit 36. It will however be appreciated that the fixture 30 and mask arrangement 32 may be comprised of one or more such masking units 34, each masking unit 34 comprising a series of protrusions or depressions 36 corresponding to the specific component geometry at each of the areas to be masked, such that the or each masking unit 34 may easily locate upon and be removed from the or each component. In an alternative example, the mask arrangement 32 may comprise a singular masking unit 34 at least substantially encompassing the or each component, the masking unit 34 comprising one or more of removed sections such that the vibro-polish media may come into contact with the surfaces of the or each component to be treated.

Also shown, in one example, are two securing portions 38, each securing portion 38 locating within a plurality of channels 40 within the radially outer surface of each masking unit 36. In particular, although the securing portions 38 are shown in Figure 1 to be separate from, but locate within each of the masking portions 34, each securing portion 38 may, in a further example, be internally located or be at least partially comprised within the masking unit 34 so as to form one or more combined units. It may alternatively be envisaged that any such channel or recess 40 be provided in order to locate the securing portion 38 within the or each masking unit 34.

As shown in Figure 2, and in one particular example, each securing portion comprises four connectors 42, each connector 42 arranged to connect to one or more arms 44 (which may also be referred to as one or more barriers) via further connectors 46. In the particular example shown in Figure 2, four resilient arms 44 are arranged between two securing portions 38 so as to encapsulate and hold, when assembled, the masking units 36 in a cooperative engagement with the component. In particular, the or each securing portion 38 may comprise a series of screw, bolt, nut or threaded formations which cooperate, in use, with a further means of attachment or connection 46 on the or each of the arms 44.

Thus, the arms 44 may be removably attached to the securing portion 38. In further examples, it may be envisaged that any such means of physical, mechanical or temporary attachment be used to attach the arms 44 to the connectors 42. Such means of mechanical attachment or assembly may include a snap-fit or quick-release, although it will be appreciated that such arrangements and interlinking portions must necessarily be shielded from interaction with the vibro-polish media.

In a further example, the or each arm 44 may be continuous and/ or form a helix around the component. In yet further examples, the or each arm 44 may extend at least substantially around the component, or the arms and/ or connectors 42 may be manufactured from a single component. Thus, the or each arm 44 and/ or connecting means 42, 46 may be either resilient or compliant to allow fitment to the component. It will also be appreciated that the or each means of connection 42, 46 may be located elsewhere in the arrangement, such as, for example, on the arms 44 themselves.

In a further example, it may be envisaged that two or more arms 44 be used to connect each connecting assembly, the exact number of arms 44 used depending on, for example, the degree of structural integrity required and the shape and/ or complexity of the component to be treated. In a yet further example, one or more arms 44 of extended width or geometry may be envisioned for use in such an arrangement, the or each of the arms 44 being moulded or sculptured to encompass each of said components.

The number of the arms 44, securing portions 38 and connectors 42 used within each fixture 30 vary in one or more of shape, number or size to increase or decrease the circumferential spacing between one or more arms 44 of the assembled fixture 30. In this way, one or more of the profile, size or shape of one or more of the arms 44 varies according to requirements to increase or decrease either or both of the radial spacing between the arms of the assembled fixture 30 and the component, or the radius of the assembled fixture 30. This ensures that the component is sufficiently contained by the fixture 30.

The circumferential spacing between the or each arm of the assembled fixture 30 is equal to or less than the radius of the fixture 30, measured from the axis of rotation of the fixture 30. The fixture 30 may comprise one or more arms helically wound around the component. Alternatively, the fixture 30 may comprise four or more arms 44. The arms may be evenly or disparately spaced. Smaller spacing between the arms 44 may be required around a particularly sensitive feature or location upon the component. By reducing the spacing of the arms, the number of arms 44 may increase.

The diameter of the assembled fixture 30 may be equal to or greater than the largest diameter of the component, measured through the components axis of rotation. The assembled fixture 30 may be spherical and is arranged to fully contain the component.

Referring now to figure 9, one or more members 144 may be further provided on one or more arms 44 of the fixture 30. Each member 144 may extend into a spacing between two or more adjacent arms 44. Such members 144 at least partially partition, and reduce the size of the spacing between the arms 44. In one such example, each arm 44 comprises a single member 144 extending from the arm. Thus, the member 144 extends circumferentially from its arm 44 towards a neighbouring arm 44. In a further example shown in figure 10, each arm 44 comprises two or more such members 144, which may extend in opposite directions. Hence, any such shape or arrangement can be envisaged which extends into, and hence reduces the size of the spacing between the arms 44, whilst maintaining the spherical profile of the fixture 30.

By reducing the size of the spacing between the or each arm 44, or increasing the radial spacing between the arms 44 and the component, the fixture 30 prevents a further similarly sized fixture 30 or component from penetrating and contacting the component when two or more fixtures 30 mesh or interact. In this way, the component is prevented, in use, from contacting a further component.

Preventing component contact refers to reducing the likelihood of contact of two or more components during the vibro-polish process. In some examples, preventing component contact may be dependent on the angle of approach of one fixture relative to another, such that a component can only contact one or more further components when approaching from a particular angle. In further examples, such prevention may wholly prevent a component from contacting one or more further components when approaching from any angle.

In some examples, the opening, that is the spacing between the one or more arms 44, is sized so as to be sufficiently small to prevent a sufficient quantity of one or more of the fixture 30 and component from meshing with or penetrating the extremity of a further fixture to the extent that two or more components physically interact. In some examples, the circumferential spacing between the or each arm 44 of the assembled fixture 30 is equal to or less than the radius of the fixture 30, measured from the axis of rotation of the fixture 30. By preventing component contact during use, the likelihood and/ or risk of either damage to the component or uneven surface treatment during the vibro-polishing process is substantially reduced.

In a further example, preventing component contact may refer to reducing the likelihood of an arm 44 or a partition contacting a further component during the vibro-polish process. In some examples, preventing arm 44 or partition contact with a component may be dependent on the angle of approach of one fixture relative to another, such that an arm 44 or partition can only contact one or more further components when approaching from a particular angle. In further examples, such prevention may wholly prevent an arm 44 or partition from contacting one or more further components when approaching from any angle.

In some examples, the opening, that is the spacing between the one or more arms 44, is sized so as to be sufficiently small to prevent a sufficient quantity of one or more of the fixture 30 and component from meshing with or penetrating the extremity of a further fixture 30 to the extent that one or more arms 44 of the fixture physically interact with the component. In some examples, the circumferential spacing between the or each arm of the assembled fixture 30 is equal to or less than the radius of the fixture 30, measured from the axis of rotation of the fixture 30. By preventing the fixture 30 from contacting the component during use, the likelihood and/ or risk of either damage to the component or uneven surface treatment during the vibro-polishing process is substantially reduced.

In the example shown in Figure 2, the or each masking unit 34 is most regularly constructed of a moulded polymeric or elastomeric material, such as, for example, polyurethane. However, it will be appreciated that any such further plastics, composite, metallic, or coated metallic material may be used.

Similarly, the or each securing portion 38 is most regularly constructed of a moulded polymeric or elastomeric material, such as, for example, polyurethane. However, it will be appreciated that any such further plastics, composite, metallic, or coated metallic material may be used. In a further example, the means of attachment 42, 46 of the or each securing portion 38 to the or each arm 44 may, in one example, be comprised of a material which is different to the body of the connector. In particular, the means of attachment 42, 46 may be comprised of a metallic or polymeric material, or any such material with sufficient mechanical properties to support a mechanical attachment or assembly for the attachment of the arms 44 to the securing portion, or in a further example, the masking unit 36.

The or each arm 44 may, in one example, be constructed of a shaped steel structure coated with a polymeric or elastomeric material, such as, for example, polyurethane. However, it will be appreciated that any such further plastics, composite, metallic, or coated metallic material may be used. In a yet further example, the means of mechanical attachment to the securing portions 42, 46 may additionally be comprised of a material which is different to the body of the or each arm 44, the means of mechanical attachment 42, 46 being comprised of a metallic or polymeric material, or any such material with sufficient mechanical properties to support a mechanical attachment or assembly appropriate for the attachment of the or each arm 44 to the connectors 42, 46.

Figure 3 shows an isometric view of the disassembled fixture 30 and masking arrangement 32 for the containment of one or more components 50 during processing, as shown in Figure 1. Figure 3 additionally shows a component 50 which is beatable within one or more of the masking units 34. In particular, the component 50 shown in Figure 3 is a radial segment of a vane, the radial segment comprising two or more aerofoils, a platform and a shroud. It will be appreciated that the component 50 may be a singular component such as, for example, an aerofoil, or a larger component such as, for example, an aerofoil, vane, stator, stator segment, bladed rotor, nozzle guide vane, turbine blade, or any such further component appropriately sized for vibro-polishing. Additionally, it may be appreciated that in a further example, one or more such components 50 may be at least partially located within or adjacent the mask. In this way, it may be possible, in one example, to treat multiple components 50 within one such fixture 30 at any one time. Alternatively, it may be that two or more masking units 34 are required within the fixture arrangement 30. Thus, in a further example, each masking unit 34 which locates against or adjacent the component 50, such that no vibro-polishing media may come into contact with the component 50, may correspond to an area or location upon the component 50 which is not to be vibro-polished or processed.

Figure 4 shows a frontal view of an assembled fixture 30, masking units 34 and component 50 for the containment of a component 50 during processing. Additionally, it can be seen that the arms 44 extend around the component 50 before each of the arms 44 are attached at either end to securing portions 38 via the connecting means 42, 46. Thus, figure 4 shows a spacing 52 between each of the arms 44 which is suitably sized relative to either the assembled fixture 30 and/ or component 50. Thus, the spacing 52 between the arms may be sized to prevent any further fixture 30 or component 50 from contacting the contained component 50 during processing. As shown in figure 4, the assembled fixture 30 forms the shape of a substantially regular sphere, thus each spacing 52 defines a radial segment. It will however be appreciated that depending on the specific geometry of the or each component 50, and the requirement to encapsulate irregularly shaped components 50, any such further shape may be envisioned. In a further example, the spacing 52 may be made smaller than that required relative to either the assembled fixture 30 and/ or component 50. Thus, components 50 which are of differing size and/ or geometry may be treated concurrently without possibility of smaller components contacting larger components.

Figure 5 shows a cross-sectional view of a vibro-polishing container 60 and partitioning arrangement 62, the arrangement comprising a central portion 64 and two partitions 66, the partitions comprising a cage, net, or mesh-like structure 68. It will also be appreciated that in a further example, the partitions 66 may alternatively comprise a solid structure further comprising a series of holes or openings at predefined or predetermined locations through which vibro-polishing media may pass during use. As such, in a further example, the partition 66 may comprise one or more solid portions 70 and mesh portions 68.

Referring again to Figure 5, it may also be appreciated that the cage, net, or mesh-like structure 68 may comprise one or more horizontal members 72 and/ or one or more vertical members 74 which define an opening 76 within the partition 66. It will be appreciated that, in a further example, any such further vertical, substantially vertical, diagonal, substantially diagonal, horizontal or substantially horizontal array of members may be envisioned in the provision of said cage, net, or mesh-like structure 68. As shown in Figure 5, the assembled fixture 30 and masking arrangement 32 for the containment of one or more components, as shown in Figure 4, is larger than each spacing or opening 76 within the cage, net, or mesh-like structure 68 of each partition 66. Thus, the assembled fixture 30 and masking arrangement 32 is prevented from traversing between partitions 66. However, vibro-polishing media may, in one example, circulate within the container 60 and traverse between partitions 66 in accordance with the natural movement and/ or circulation of the media within the container 60.

In a further example, the specific number and spacing of the members 72, 74 comprised within the partition 66 may depend on one or more of the size and shape of the component 50, including the assembled fixture 30 and masking arrangement 32. In instances where a smaller component is to be processed, there will be a need for either the specific number and spacing 76 of the members 72, 74 to be modified accordingly. Thus, spacing 76 of the members 72, 74 may be reduced to provide smaller holes, or a finer cage, net, or meshlike structure 68.

In a further example, a generic partition 66 may be used which comprises openings 76 or holes smaller than the assembled fixture 30 and masking arrangement 32 for the containment of the smallest component to be processed, or a minimum component sizing. Thus, the partition 66 may be used for both large and small components during the vibro-polishing process. Thus, through the use of a partition 66 with smaller or finer spacing 76 and/ or structure, dissimilar components of both large and small sizing may be processed within the same container 60. In a yet further example, through the use of a partition 66 with appropriately sized opening 76 and/ or spaced structure, dissimilar components of both large and small sizing may be processed within the same container 60, but within separate partitioned sections. In a yet further example, through use of the previously described appropriately sized opening 76 and/ or spaced structure, dissimilar components of both large and small sizing may be processed within the same portioned section.

In accordance with the previously described examples, it will be appreciated that decreasing the spacing size of the or each opening 76, thus decreasing the size of the holes 76, or increasing the number of vertical and/ or horizontal members 72, 74 may lead to an inherent increase in the surface area of the partition, leading to an increased interaction with, along with increased stirring rate of the vibro-polish media. Thus, mobility of the vibro-polish media may be enhanced through use of a finer spacing or hole arrangement 76, or alternatively increasing the size of the horizontal members and/ or vertical members 72, 74.

Figure 6 shows an isometric view of a vibro-polishing container 60 and partitioning arrangement 66 previously described in Figure 5. Accordingly, Figure 6 shows the vibro-polishing arrangement comprising a central portion 64 and six partitions 66, the partitions comprising a cage, net, or mesh-like structure 68 as described in relation to Figure 5. It will be appreciated that in a further example, the partitions 66 may alternatively comprise a solid structure further comprising a series of holes or openings at predefined or predetermined locations through which vibro-polishing media 78 may traverse.

In use, vibro-polishing provides a rubbing and/ or cutting action which allows vibro-polishing to produce an essentially smooth surface finish, bought about by what may be described as a substantial lapping action. Consequently, there is no tearing action or unequal forces which may lead to the or each component 50 bending or becoming distorted. As such, and due to the fact that the container 60 and component 50 move as a substantially combined unit, fragile or delicate components 50 are supported by the media immediately surrounding the component 50, so making vibro-polishing suitable for a wide range of delicate applications where improvement of surface finish is required.

In particular, the surface finish of the or each component 50 is known to be at least partly attributed to the frequency and amplitude of the machine. Frequencies of vibration of the arrangement shown in Figure 6 may vary from between about 900 and 3600 cycles per minute, or about 15 and 60 cycles per second (Flz). Additionally, vibration amplitudes, that is the offset between a maximum displacement and minimum displacement, may vary from between about 0 to 4.76mm. For certain applications requiring a fine surface finish, or where delicate parts are being polished, operating parameters may typically include high frequency, low amplitude vibrations. Large amplitudes may be used in instances where large amounts of material removal or heavy cutting is required, and high frequency vibrations may be used where the surface finishing process requires the rolling of burrs and/ or peened edges. It will however be appreciated that operational ranges may vary within about the stated ranges according to application.

In a ‘fixed’ vibro-polishing process, one or more components 50 may be masked, fixed within the fixture 30 and masking arrangement 32 and lowered into a shaped container 60 comprising a suitable polishing media, such that the media is vibrated relative to the components or vice versa. Such a stationary component 50 process has been found to provide significant cycle time reduction to achieve a given surface finish.

In a further ‘traditional free flow’ vibro-polishing process, the or each component 50 may be instead placed in a free flow vibro-polishing container 60 and vibro-polished in surrounding ‘free’ media, for example, to restore surface finish during manufacture or following repair. Accordingly, components 50 are free to move within the media according to the natural movement of the media during processing. Most typically, components 50 move together with the vibro-polishing process in a circular motion within the container 60. In a modified ‘fixed vane’ vibro-polishing method used in conjunction with a traditional free flow vibro-polishing container, the media is vibrated relative to the components or vice versa. In using the presently described method, components 50 may be held stationary within the vibro-polishing container 60, allowing media to run through the components in order to achieve a polishing effect in a similar manner to a drag polishing process.

Referring again to Figure 6, and as described in relation to Figure 5, the smallest diameter of the assembled fixture 30 and masking arrangement 32 through the axis of rotation of the component 50, as shown in Figure 4, is larger than each spacing or opening within the cage, net, or mesh-like structure 76 of each partition 66, thus preventing the assembled fixture 30 and masking arrangement 32 from traversing between partitions 66, but allowing the vibro-polishing media to circulate within the container 60 and traverse between partitions 66 in accordance with the natural movement of the media 78. Furthermore, in a further example, the specific number of horizontal and/ or vertical members 72, 74, or the sizing of the openings 76 comprised within the partitions 66 may depend on the size of the component 50 and/ or the assembled fixture 30 and masking arrangement 32 for the containment of the component 50 during processing. As such, the arms 44 of the fixture 30 prevent the cage, net, or mesh-like structure 76 from contacting the component 50 during the vibro-polish process. In some examples, the opening, that is the spacing between the one or more arms 44, is sized so as to be sufficiently small to prevent a sufficient quantity of the cage, net, or mesh-like structure 76 from meshing with or penetrating the extremity of a further fixture 30 to the extent that the cage, net, or mesh-like structure 76 physically interacts with the component 50. In some examples, the circumferential spacing between the or each arm 44 of the assembled fixture 30 is equal to or less than the radius of the fixture 30, measured from the axis of rotation of the fixture 30. By preventing the cage, net, or mesh-like structure 76 from contacting the component 50 during use, the likelihood and/ or risk of either damage to the component 50 or uneven surface treatment during the vibro-polishing process is substantially reduced.

Referring again to Figure 6, the partitioning arrangement 66 may ordinarily remain static during use, so allowing the vibro-polish media 78 to circulate between partitions 66. In a further example, partitions 66 may be rotated about the central portion 64 during use. Thus, rotating the partitions 66 about the central portion 64 shall rotate the components 50 contained within the or each assembled fixture 30 within the vibro-polish media 78, providing a vibro-assisted drag polishing process.

Figure 6 shows a side-view of an assembled fixture 30, masking arrangement 32 and component 50, the assembled fixture 30 and masking arrangement 32 providing for the containment of the component 50 during interaction of the assembled fixture 30 with the partition 66. In particular, Figure 7 also shows an example of the movement, in use, of the vibro-polishing media 78 relative to the assembled fixture 30, masking arrangement 32 and component 50.

It will be appreciated that, in use, the assembled fixture 30 may interact with the partition 66, the interaction of the assembled fixture 30 with the partition 66 having the effect of slowing down the movement of the assembled fixture 30 within the vibro-polishing container relative to the vibro-polishing media 78. Thus, the assembled fixture 30 may move within the vibro-polishing media 78 relative to the partition 66 or rotate freely relative to the partition 66 at a slower rate than the vibro-polishing media 78 flow with a reduced risk of components 50 interacting with, or contacting each other.

In accordance with the above, during interaction of the assembled fixture 30 with the partitioning arrangement 66, frictional contact forces acting on the fixture 30 as a result of being pressed against the partition 66 via relative movement of the vibro-polishing media 78 and the fixture 30 may provide a resistance on the movement of the assembled fixture 30. Without the assembled fixture 30 and masking arrangement 32 surrounding and/ or containing the component 50, components 50 may get trapped in the partition 66 at a fixed position and/ or angle, causing the vibro-polishing media 78 to act on only one surface of the component 50, and leading to the potential occurrence of a non-uniform surface finish.

In a further example, and as shown in Figures 4 and 7, the assembled fixture 30, inclusive of the masking arrangement 32 and component 50 is substantially balllike or spherical. However, as previously described, it will be appreciated that depending on the specific geometry of the component 50, any such shape may be envisioned. In a further example where the assembled fixture 30, inclusive of the masking arrangement 32 and component 50 is substantially ball-like or spherical, by nature of the shape of the assembled fixture 30, it may be allowed to rotate freely during use, even whilst forward movement is at least partially resisted by the partitioning arrangement 66.

Figure 8 shows an isometric view of an assembled fixture 30, masking arrangement 32 and component 50 during interaction of the fixture 30 with the partitioning arrangement 66, in one particular example.

Referring again to figures 7 and 8, in allowing the assembled fixture 30 and masking arrangement 32 surrounding and/ or containing the component 50 to rotate or freely move relative to one or more of the partitioning arrangement 66 and the vibro-polishing media 78, during use, the potential for abrasive vibro-polishing media 78 to act on only one surface of the component 50, and leading to the potential occurrence of a non-uniform surface finish, is at least partially reduced, so leading to the potential for an improved uniformity in material removal and/ or polishing effect. In a further example, the masking arrangement 32, inclusive of the component 50, may be arranged to rotate within the assembled fixture 30 via, for example, a track, bearing system or rotatable yoke comprised in the assembled fixture 30, so as to ensure that in instances where the assembled fixture 30 becomes lodged or stuck within the partition 66, the component 50 may still rotate within the fixture 30, thus reducing the potential for abrasive media to act on only one surface of the component, and leading to the potential occurrence of a non-uniform surface finish.

It will be understood that the disclosure is not limited to the examples above-described and various modifications and improvements can be made without departing from the concepts described herein. For example, an arrangement for vibro-polishing may only comprise a fixture and a container. The remaining features (such as the agitator and the one or more partitions) may be added by a further manufacturer or end user. Except where mutually exclusive, any of the features may be employed separately or in combination with any other features and the disclosure extends to and includes all combinations and subcombinations of one or more features described herein.

Claims (13)

1. An arrangement for vibro-polishing one or more components, the arrangement comprising: a container for containing vibro-polishing media, an agitator to agitate the vibro-polishing media relative to the container; one or more partitions extending substantially across the container so as to provide two or more sectors; and, a fixture comprising at least one member which extends around one or more components for insertion into the vibro-polishing media, each member defining an opening which is sized to prevent any further fixture or partition from contacting the or each component.

2. An arrangement as claimed in claim 1, wherein each member comprises an arm.

3. An arrangement as claimed in any preceding claim, wherein the depth of the or each partition is at least substantially equal to the depth of the vibro-polishing media within the container.

4. An arrangement as claimed in any preceding claim, wherein the or each partition comprises one or more openings.

5. An arrangement as claimed in any preceding claim, the vibro-polishing media comprising one or more solid components.

6. An arrangement as claimed in any preceding claim, the vibro-polishing media comprising one or more liquid components.

7. An arrangement as claimed in claim 4, wherein the or each opening within the or each partition is larger than the or each vibro-polishing media component to allow the vibro-polishing media to traverse between partitioned sections.

8. An arrangement as claimed in claims 4 to 7, wherein the or each opening within the or each partition is sized to prevent the or each fixture from traversing between partitioned sections.

9. An arrangement as claimed in any preceding claim, wherein the or each partition comprises a mesh.

10. An arrangement as claimed in any preceding claim, wherein the or each partition is arranged within the container so as to rotate, in use, within the vibro-polishing media.

11. An arrangement for vibro-polishing one or more components, the arrangement comprising a container for containing vibro-polishing media, an agitator to agitate the vibro-polishing media relative to the container and, a fixture comprising at least one member which extends around one or more components for insertion into the vibro-polishing media to prevent any further fixture or partition from contacting the or each component.

12. An arrangement for vibro-polishing one or more components, the arrangement comprising a container for containing vibro-polishing media, a fixture comprising at least one barrier which extends around one or more components for insertion into the vibro-polishing media to prevent any further fixture or partition from contacting the or each component.

13. An arrangement of the kind set forth substantially as described herein with reference to and as illustrated in figures 1 to 10 of the accompanying drawings.