• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A roller assembly for a rotary blocker comprises a plurality of axial segments which may be in the form of discs, each disc being provided with an abrasive, radially outer surface. The discs are axially aligned, each in a predefined rotational orientation. The disk assembly has an aperture arranged centrally to receive a rotor shaft. The abrasive surface of the assembly can be accurately presented in the form of a network of abrasive units uniformly formed in a predefined pattern.
    公开号:FR3033726A1
    申请号:FR1651815
    申请日:2016-03-03
    公开日:2016-09-23
    发明作者:Dragos A Axinte；Donka NOVOVIC；Paul Butler-Smith；Alessio Spampinato；Mark Daine
    申请人:Rolls Royce PLC；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a novel rotary blocker design of the type typically used in the dressing and dressing of grinding wheels and other abrasive cutting tools and tools. Rotary blockers are widely used to regenerate or form abrasive wheel surfaces and other tools to provide or restore the necessary tool profile. The dressing of grinding tools is crucial when these tools are to be used in the machining of profiles with close tolerances and small radii. A typical rotary blocker comprises a rotor shaft on which is mounted a concentrically arranged roller tool which is provided with a radially outer abrasive surface. The radially outer surface can be accurately contoured to indicate the shape of the component to be grinded. The abrasive surface may consist of several abrasive grains bonded to the surface. Synthetic diamond grains are commonly used, but it is also known to use natural diamond grains. Examples of diamond rotary trainers are described in previously published patent applications EP2447005 A2, EP1346797 B1 and US2012 / 0302146. These prior publications seek to solve the problem of random grain distribution that can lead to accelerated wear and clog the flow of debris through the surface during the operation of the trainer. These documents provide controlled positioning and bonding of abrasive grains on a roll surface to achieve a more uniform load and debris flow. The costly and time-consuming methods proposed require complicated placement of the grains around the surface. These methods are not a practical solution where the rotary blocker is required for dressing and dressing tools with very small radii and narrow tolerances. According to a first aspect of the invention, a roller assembly for a rotary trainer comprising a plurality of discs is provided, each disc being provided with an abrasive surface, radially outer, the discs being fixed in axial alignment, each in an orientation preconfigured rotation and an aperture arranged centrally to receive a rotor shaft and wherein the radially outer surface of one or more disc (s) has been subjected to a material removal process to form a pattern predefined individual abrasive units. The assembly may comprise the entire roller for the rotary blocker, or alternatively, the assembly may comprise at least one disc having an abrasive, radially outer surface which has been subjected to a material removal process in order to forming a predefined pattern of individual abrasive units, the disk (s) secured in axial alignment with at least one roller portion having an abrasive grain arrangement about its radially outer surface, the disk having a finer grit surface than one or more roll parts. In such a hybrid assembly, the abrasive surface of the disc can provide improved training in narrower tolerance areas or smaller radii on the tool to be trained. The abrasive material of the radially outer surface of the disc comprises one or more superabrasive material (s) and may be provided in a layer on the surface. The main disk body may comprise a non-abrasive material. Alternatively, the disc may consist entirely of the abrasive material. A synthesized diamond is a suitable abrasive material and can be used in the form of a polycrystalline diamond or a diamond deposited by CVD. A suitable alternative is PCBN (polycrystalline cubic boron nitride). The different discs can be provided with different abrasive materials. Any of the disks may be provided with a combination of abrasive materials. Specific disk material (s) for all disk surfaces can be defined according to the requirements of the wheel to be trained. For example, less abrasive abrasives may be used to dress surface areas of the grinding wheel that require less grinding. The abrasive surface of each disk can be patterned according to end user needs. The discs as a whole can share the same pattern or have different patterns.
    [0002] A desired pattern can be obtained using an energy beam ablation method. Such methods are known to be a fast and efficient means for forming a pattern on solid diamond structures. Alternative methods for pattern formation include energy beam sputtering (i.e. focused ion beam). Such sputtering methods are used in particular to obtain a better defined (cut) edge characteristic resolution. In one example, the invention uses a pulsed laser ablation technique. The techniques described for the removal of material allow individual abrasive units of defined shape, size and projection to be formed and their location to be precisely controlled. The profiling of individual abrasive units can be controlled at microscopic resolutions. A population distribution of the abrasive units may also be adapted to suit specific characteristics of the dressing wheel.
    [0003] The population distribution can be defined according to the characteristics of the grinding wheel, such as its profile, roughness and machining tolerances, which it is necessary to obtain. A higher surface density of units is well suited for training narrow radii on the grinding wheel. Conversely, the lower surface densities are well suited for dressing surface regions with regular radii and simple profiles. By combining the discs together with different abrasive population distributions, the training operation can be controlled to obtain consistent and optimal results. The 3D characteristics of the abrasive units can be individually defined to suit the desired defined actions, directions, and rotations of the roll assembly. By using laser ablation methods, one and / or the other of the cutting angle (y) and the draft angle (a) of a unit can be defined . In other more complex arrangements, a combination of primary and secondary angles of attack and primary and secondary draft angles may be defined. Asymmetric units may be defined allowing the unit to perform a different training action depending on the direction of disk rotation. The abrasive units on adjacent disks can be aligned to provide a series of channels between the disks allowing a refrigerant to be dispensed through the trainer, allowing for a reduction in the maximum surface temperature attained during a period of time. training operation. A simple arrangement involves equidistant rows of equidistant abrasive units extending around the radially outer surface.
    [0004] 3033726 Alternate rows may be offset from each other. Such an arrangement is well suited to the dressing of a cylindrical component. The disk diameters may be the same or different. A suitable arrangement of discs of different diameter provides a radial surface to the assembly which is non-linear in an axial direction. The assembly can be configured to allow the removal and replacement of disks for repair, or to adapt the assembly to different dressing applications. The thickness of the discs may be the same or different.
    [0005] The discs may be provided with several holes arranged at equal radii from the center of the disc. With their respective holes aligned, several discs can be screwed on several rods thus preventing the rotation of the discs relative to each other. In another aspect of the invention, the disks may consist of a plurality of disk segments. Advantageously, the segments may comprise arcuate parts of equal size. Each segment may have two or more spaced holes that can be screwed onto rods as described above. The stems may be received and fixed in flanges at each end of the multi-disc assembly thereby maintaining the segments in circumferential and axial alignment. PCD discs and disk segments are already available for purchase for other applications. Commercially available disks typically include a cemented carbide substrate incorporating a metal-solvent catalyst, typically cobalt. A layer of micron synthetic diamond powder is provided on the radially outer surface and the disc is sintered under extreme pressure and temperature and the catalyst migrates to the synthetic layer promoting the formation of a polycrystalline structure. Alignment holes can be machined in the disks. The disks can be derived from a PCD layer evenly distributed on the radial outer surface. Using the described ablation methods, the material can be removed from the PCD surface in a predefined pattern leaving an arrangement of abrasive units radially projecting in a predefined pattern. The ablated disks are thus adapted for use in a roller assembly in accordance with the present invention.
    [0006] Thus, by controlling the abrasive unit characteristics (i.e. size, shape, protrusion and position) using the contemplated methods, the efficiency of the dressing process can be improved and the Wear rates of narrow profiles can be controlled and thus minimized.
    [0007] The stacked disc configuration of the proposed roll assembly provides great flexibility. By simply exchanging one or more disc (s) in the set, a variety of abrasive patterns that are suitable for a variety of specific training applications can be obtained. Discs or even worn or broken disc segments can be easily replaced without the need to replace the entire rotary trainer roll tool. When there is low wear on an abrasive surface of a disc, the abrasive pattern can be regenerated using the ablation techniques envisioned. In another aspect of the invention, a roll for a rotary blocker 15 is provided, the roll being provided with a radially outer abrasive surface on which axial segments are defined where the radially outer surface of the roll has been subjected to material removal process to form a predefined pattern of individual abrasive units on each defined axial segment. The predefined pattern may be different for different axially defined segments to meet different dressing requirements and tool wear rates at different axial positions along the roll. The roll may have a non-linear profile. It will be appreciated by those skilled in the art that methods for providing the abrasive units and features of the abrasive unit geometries and patterns described elsewhere in this specification in relation to individual disk abrasive surfaces can be equally applied to the surfaces. defined axial segment abrasives of embodiments of this aspect of the invention. Thus, adjacent segments may be provided with abrasive units of different geometries, different abrasive unit surface densities, and / or different patterns of abrasive units. A known ablation process is laser ablation. Using this method to define the textured pattern on the abrasive surface achieves precise texturing with the ability to generate specifically designed abrasive units of identical size, shape, and protrusion from the surface of the abrasive surface. tool. The size and shape of the abrasive units can be controlled at a microscopic level.
    [0008] While laser ablation is a very practical method for providing the described abrasive patterns, alternative methods are possible, for example and without limitation; electrical discharge machining (EDM), laser tracing or laser break-in. Controlled chemical deposition of abrasive material on a surface of the substrate in a predefined pattern as an alternative is also contemplated. Those skilled in the art will appreciate, unless mutually exclusive, that a feature described in connection with any of the above aspects of the invention may be applied mutatis mutandis to any other aspect of the invention.
    [0009] Embodiments of the invention will now be described by way of example only, with reference to the Figures, in which: Figure 1 illustrates three examples of a roller face of a rotary trainer as known in the prior art; Figure 2 illustrates a first embodiment of a roller assembly according to the invention; Figure 3 illustrates a segment of a disk adapted for use in a roller assembly in accordance with the invention; Figure 4 illustrates a disk assembled from a plurality of segments similar to those of Figure 3; Figure 5 illustrates an axial view (5a) and an orthogonal section (5b) of a roller assembly according to an embodiment of the invention; Figure 6 illustrates a perspective view and an enlarged sectional view of a roller assembly in accordance with one embodiment of the invention; Figure 7 illustrates a roller assembly according to an embodiment of the invention in situ, in a trainer; Figure 8 illustrates two exemplary patterns and patterns / arrangements of abrasive units on a roller assembly to provide a specific spacing according to one embodiment of the invention; Figure 9 illustrates a roller assembly according to an embodiment of the invention; Figure 10 illustrates a roller assembly according to another embodiment of the invention; FIG. 11 illustrates an example of geometries for abrasive units to be provided on the radially outer surface of disks included in a roller assembly according to the invention; Figure 12 illustrates cutting (y) and draft (a) angles on three examples of abrasive units having different geometries; Figure 13 illustrates in detail the surface of an abrasive unit for use in certain embodiments of the invention; Figure 14 illustrates in detail the geometry and dimensions of an example of an abrasive unit that is suitable for use in certain embodiments of a roller assembly in accordance with the invention. As can be seen in Figure 1, an outer surface of a trainer roll 1 is impregnated with carefully placed individual abrasive grains 2. While the position and surface density of the individual grains 2 have been carefully selected the individual grains 2 are of varying shape, size and radial projection, therefore, at a high resolution, the surface pattern is not uniform. Such an arrangement is not suitable for training of high precision components and particularly those with small radii and narrow tolerances where the wear of trainer increases. Figure 2 illustrates a set of disks for use in a roller assembly according to a first embodiment of the invention. As can be seen, the assembly (generally designated 11) comprises a plurality of disks 3 arranged in axial alignment to form an assembly having an axially oriented surface 4 and a radially outer surface 5. The radially outer surface 5 is provided with a Abrasive unit pattern further illustrated in Figure 8. Figure 3 illustrates a disc segment generally designated 3a, a plurality of which may be assembled into a disc 3 for incorporation into a roll assembly in accordance with the invention. . The arcuate disk segment has an axially oriented surface 4 and a radially outer surface 5 (for simplicity, the detail of the abrasive surface is not shown). A pair of symmetrically arranged holes 6a, 6b pass through the segment 3a to receive locking rods (not shown). Figure 4 illustrates a disk 3 assembled from 12 substantially identical disk segments 3a, each having the construction as illustrated in Figure 3. As can be seen, the pairs of holes 6a, 6b are symmetrically arranged to axial radial distances in the axially oriented surface 4. Figure 5 illustrates a set of discs 11 attached to a hub 12 which has a bore 9 for mounting on a rotor shaft (not shown).
    [0010] The disk assembly 11 rests on the radially outer surface of the hub 12. The hub 12 is sandwiched between two flanges 7 and 8 which hold the disks in the assembly 11 all together along an axial direction. The hub 12 has tapped holes 10 for receiving screws 13 which pass through correspondingly aligned holes in the flanges 7 and 8 to secure the assembled portions of the roll assembly. Figure 6 illustrates in perspective view, one embodiment of a roller assembly according to the present invention. The assembly is broadly similar to that shown in Figure 5. In Figure 6, the disks in the disk array 11 are comprised of disk segments 3a, substantially of the form already illustrated in Figures 3 and 4. As can be seen, the flanges 7 and 8 are provided with recesses arranged symmetrically and axially aligned which in turn are axially aligned with the holes 6a and 6b of the disk segments 3a. The rods 14 pass through the holes 6a, 6b and are received in the aligned recesses 15 of the flanges 7 and 8.
    [0011] With respect to the embodiment of Fig. 5, the flanges 7 and 8 are in turn attached to the hub 12 by means of screws 13 to provide a complete set of rollers which can be attached to a rotor shaft (no illustrated). It will be apparent to those skilled in the art, in other embodiments, that a similar arrangement of flanges, recesses, holes and rods may be used to secure a set of complete disks, as well as segmented disks shown in Figure. Figure 7 illustrates an embodiment of a roller assembly 7, 8, 11 according to the invention attached to a rotor shaft 16. The assembly 7, 8, 11 is fixed between a pair of axially aligned spacers 17 and locked in position on the shaft 16 by means of a locking nut 18. This fastening arrangement 16, 17, 18 is of conventional design. Figure 8 illustrates enlarged views of two different embodiments of the disk array 11. An abrasive unit pattern 19 is on the radially outer surface 5 of each disk. As mentioned previously, the pattern can be cut in the surface using conventional laser ablation techniques. The illustrated pattern is suitable for a dresser roller 3033726 for forming a cylindrical grinding wheel. As can be seen, the abrasive units 19 have a uniform shape and size and are aligned in rows with the equidistant units 19. Alternate rows are slightly offset so that a unit 19 in one row rests above the gap between the abrasive units 19 in adjacent rows. In addition, the spacing between the individual rows is even and uniform around the circumference of the assembly 11. The uniformity of shape, size and projection of the abrasive units 19 and their ordered arrangement through the aligned surfaces 5 a very regular dressing operation and even wear of the roller assembly. Channels defined between adjacent rows provide effective control of debris flow and / or may be used to dispense coolant during operation. As can be seen, in order to obtain a staggered pattern on the radially outer abrasive surface of discs, some abrasive units are distributed over the interface between two adjacent discs. Figure 9 illustrates another embodiment of a disk array suitable for use in a roller assembly in accordance with the invention. The set consists of 3 main sections, each consisting of several discs. A central section 111 comprises several discs of different diameters. Larger diameter discs lie in the center; other disks are arranged in a descending diameter order, symmetrically on either side of the central disks providing a conical circumferential profile. Sections 112 and 113 extend symmetrically across the center section 111. Again, the disks constituting the sections 112 and 113 are arranged in decreasing diameter order with the smaller diameter disks. at the axially opposite ends of the assembly. As can be seen, the reduction in diameters for section discs 112 and 113 is less extreme than that for section 111 resulting in a more progressively tilting surface. It will be understood by the geometry of the assembly that a roller assembly incorporating this set of disks is suitable for dressing a grinding wheel with a circumferential inclination in the center of its radially outer surface. As the profile of section 111 indicates, the radii from the center of the inclination are very narrow. The profile of each side of the inclination is relatively regular with a much softer change of rays across the surface.
    [0012] The boxes on the left of the set of discs illustrate enlarged views of the surfaces of the discs in sections 112 and 111. Although not illustrated, it will be understood that the disc section 113 will have a surface that is essentially a mirror image of the disc. that of section 112.
    [0013] In section 112 (and 113), the abrasive units 191 are of uniform size, shape and radial projection and are evenly distributed in a checkerboard pattern across the surface of the section. Section 111 which is configured to dress and dress narrow radii is provided with a very densely packed pattern of abrasive units 192. As is the case for the arrangement shown in FIG. 8, units 192 are of uniform size, shape and radial projection. They are aligned in rows, as in Figure 8 and Section 112, but the gap between units and adjacent rows is much smaller. This arrangement of densely packed abrasive units allows for better control of dressing accuracy on the narrow spoke surface. As can be seen, the abrasive units 191 and 192 are cut into the truncated quadrilateral pyramid shape. This arrangement allows dense packing of the units on the radial surface (almost touching in section 111) while providing channels between the units closest to the truncated, radially outer surfaces of the debris passage units and / or the effective distribution of a cooling fluid. As mentioned above, in another aspect, the disks may be replaced by axially defined segments of a roll which may have a profile similar to the illustrated roller assembly and where a similar pattern of abrasive units may be applied. Figure 10 illustrates an alternative embodiment of the invention. The illustrated roller assembly includes a roller portion 211 whose radially outer surface has a plurality of integrated abrasive grains 211a. Two discs 23 are also integrated in the radially outer surface of the roll portion, substantially of the shape already described. The discs have a radially outer abrasive surface of abrasive units which are considerably smaller in size than the individual abrasive grains 211a on the radially outer surface of the roller portion 211. The discs are positioned to indicate the profile of a disc. region of small radius or narrow tolerance on the surface of the tool to be trained.
    [0014] It will be appreciated that a wide range of abrasive unit geometries is possible using laser ablation. Geometries can be uniform or non-uniform and symmetrical or asymmetrical. One and / or the other of the cutting angle (y) and the draft angle (a) of a given unit geometry can be defined. It is also possible to define a combination of primary and secondary cutting angles and primary and secondary draft angles. Therefore, it is also possible to provide a specific geometry for the units, which geometry allows different dressing actions depending on the rotational direction of the trainer roller assembly. Several possible geometries can be obtained on the abrasive surface, in order to optimize the abrasive action according to the arrangement of abrasive units and the angle of cut. Figure 11 illustrates some examples of geometries, other geometries are possible without departing from the scope of the invention.
    [0015] Several cutting angle values (y) can be obtained by techniques such as laser ablation, further increasing control of the abrasive action of the blocker. With reference to Figure 12, the cutting angle can be either positive or negative, for example in the range of -600 to +200. These values are only an indication of the possible range using current laser ablation techniques. In conjunction with the cutting angle, the draft angle (a) may vary for a specific abrasive arrangement, allowing control of the dressing action in terms of pressure applied between abrasive units in different regions on the surface. abrasive blocker. Referring to Figure 12, it would be possible to vary the clearance angle between 00 and + 20 ° to control the amount of pressure on each abrasive unit resulting from the interaction between the grinding wheel and the grinding wheel. dressage tool. Thus, the contact pressure can be reduced by increasing the draft angle and vice versa.
    [0016] Due to the high capabilities of material removal techniques such as the laser ablation technique, the abrasive surface density range of the new dressing tool can range between the same values covered by conventional shapers, with the possibility to be more extensive. For example, according to conventional diamond shaped rolls, the density values corresponding to a specific diamond size can be summarized in Table 1.
    [0017] 3033726 12 Diamond Size (Pm) Surface Density (carat / cm2) Dense Medium Low 1000/850 2.3 2.0 1.6 850/710 2.1 1.8 1.5 710/600 1.7 1 , 1.3 600/500 1.5 1.3 1.1 500/425 1.2 1.0 0.8 425/355 0.9 0.7 0.5 Table 1 - Typical diamond sizes and densities For diamond shaped rollers In the case of conventional blockers, the surface abrasive density is primarily correlated with the abrasive particle size. Conversely, in embodiments of the present invention, it is possible to define different combinations of shape, size and density of abrasive units which leads to high control of local abrasive characteristics.
    [0018] An additional advantage of using the laser ablation technique to achieve the patterns and geometries of abrasive units on the abrasive blocker surface is that, unlike combined blockers, very small abrasive units (e.g. <100 pm) can be arranged with specific patterns, removing the limitation on the minimum abrasive size currently associated with certain prior art trainers. It will be appreciated, for trainers characterized by complex profiles, that the speed ratio value is not uniform and varies depending on the profile radii. In order to compensate for this variation, it is possible to act on both the size and the surface density of the abrasive unit.
    [0019] Increasing the number of abrasive units per unit area (surface density) or decreasing the average size of the abrasive units will correspond to lower values of the roughness of the grinding wheel surface. Thus, in the case of higher values of the gear ratio, the wearer wear rate can be reduced by increasing the surface density.
    [0020] The lower limit of the abrasive density may be imposed depending on the shape and size of the grains taken. Further explanation is given with reference to FIG. 14. The Figure illustrates a truncated pyramidal abrasive unit, with the dimensions shown in FIG.
    [0021] The dimensions illustrated in the Figure correspond to an average diameter of 0.6 mm for an abrasive particle of ideal spherical shape, using a correlation based on the basic perimeter equality and on the assumption that the abrasive unit ideal has a projection height equal to half the diameter. In this example, the maximum surface density can be calculated to be approximately 0.8 carat / cm 2. However, as mentioned previously, it may be advantageous to leave a larger gap between the unit bases to allow for proper flow of machined material and / or passage of a refrigerant. Nevertheless, grains with a smaller size can be stacked in a denser configuration. Figure 13 illustrates another optional and potentially beneficial feature using the described techniques. As can be seen, a single abrasive unit 319 is provided with a surface pattern of much smaller abrasive units 320. Such an arrangement provides a further increase in surface abrasive action. As already indicated, using laser ablation techniques (and the like), the patterns and pattern arrangements of the abrasive units can be designed to be suitable for the specific grinding wheel application, providing the possibility of wide range of patterns or combinations of patterns (eg, ordered, stepped, wavy) having features that are either uniformly distributed over the entire radially outer surface, or having regions of different populations of units depending on factors such as than the work cycle and precision requirements of the trainer. In addition, the pattern of the abrasive units may be designed to allow optimum debris flow during the dressing process. It will be appreciated by those skilled in the art that the novel abrasive pattern configurations described herein are applicable not only to the roll assemblies and dressing rolls described in detail, but also to simple disc arrangements (with a single ring of abrasive units on a disk or roll periphery) and also attached dressing tools including, but not limited to, blade tools, multi-point diamond dress and single diamond tip dressers. It should be understood that the invention is not limited to the embodiments described above and various modifications and improvements can be made without departing from the concepts described herein. Unless mutually exclusive, one of the features may be used separately or in combination with other features and the invention relates to and includes all combinations and sub-combinations of one or more characteristic (s) described ( s) here. 5
    权利要求:
    Claims (17)
    [0001]
    REVENDICATIONS1. Roller for a rotary blocker, the roll being provided with a radially outer abrasive surface in which axial segments are defined where the radially outer surface of the roll has been subjected to a material removal process to form a predefined pattern of individual abrasive units on each defined axial segment.
    [0002]
    A roll as claimed in claim 1 in the form of a set (11) comprising a plurality of discs (3), each disc being provided with an abrasive surface, radially outer (5), the discs being secured in axial alignment to form the axial segments, each in a preconfigured rotational orientation and an aperture arranged at the center (9) for receiving a rotor shaft and wherein the radially outer surface of one or more disc (s) has been subjected to material removal process to form the predefined pattern of individual abrasive units (19; 191).
    [0003]
    A roll as claimed in claim 1 in the form of an assembly for a rotary blocker comprising at least one disc (23) having a radially outer abrasive surface which has been subjected to a material removal process. to form a predefined pattern of individual abrasive units (19; 191), the disc (s) being secured in axial alignment with at least one roll portion (211) having an abrasive grain arrangement (211a) around its radially outer surface, the disc having an abrasive surface with finer grains than one or more roll portions, the disc (s) and the roll portion forming the axial segments.
    [0004]
    4. Roller as claimed in one of the preceding claims, wherein the radially outer surface of one or more axial disk (s) / segment (s) comprises an array of abrasive units (19; , 192) arranged in a predefined pattern and the predefined pattern is different for different axially defined segments / discs to meet different dressing requirements and tool wear rates at different axial positions along the roll.
    [0005]
    A roll as claimed in one of claims 1 to 4, wherein the radially outer surface (5) has been treated using an energy beam ablation technique to remove material from a abrasive material evenly distributed to provide individually formed abrasive units (19; 191,192). 3033726 16
    [0006]
    A roll as claimed in claim 5, wherein the abrasive material is polycrystalline diamond (PCD).
    [0007]
    A roll as claimed in one of claims 4 to 6, wherein the geometry of the abrasive units is defined using at least one primary cutting angle (y) and a primary draft angle (a).
    [0008]
    A roll as claimed in claim 7, wherein the geometry of the abrasive units is further defined using a secondary cutting angle and a secondary clearance angle different from the primary cutting angle (y) and the primary clearance angle (10 co.
    [0009]
    A roll as claimed in any one of the preceding claims, wherein the axial segments comprise one or more disc (s) made of a plurality of disc segments.
    [0010]
    A roll as claimed in any one of the preceding claims, wherein the axial segments comprise one or more disc (s) and further comprising a hub (12) received in a common bore (9) of the assembly. disks, first and second flanges (7, 8) arranged on opposite axially oriented surfaces (4) of the disk array (11), an arrangement of tapped holes (10) extending through each flange (7, 8) and in the hub (12) and an arrangement of fasteners 20 securely received in the threaded holes (10) to maintain the disks, flanges and hub in axial and rotational alignment.
    [0011]
    A roller as claimed in claim 10, wherein one or more of the disks is made of a plurality of segments (3a) which are arcuate and have an axially oriented surface (4) and a radially outer surface ( 5), and a pair of symmetrically arranged holes (6a, 6b) extending through the segment, recesses (15) are provided in at least one of the flanges (7, 8) in alignment with the holes (6a, 6b) and locking pins (14) are located in the aligned holes (6a, 6b) and recesses (15).
    [0012]
    A roll as claimed in claim 10 or 11 mounted on a rotor shaft (16) between axially aligned spacers (17) and rotatably and axially locked in position by means of a lock nut (18).
    [0013]
    A roll as claimed in any one of the preceding claims, wherein the axial segments comprise one or more discs and the discs are provided in a range of diameters and are arranged in a predefined order to provide a predefined nonlinear circumferential profile of the roll assembly.
    [0014]
    A roll as claimed in any one of the preceding claims, wherein the axial segments comprise a plurality of disks and all the disks do not share the same population density of abrasive units on their radially outer surface.
    [0015]
    A roll as claimed in any one of claims 4 to 14, wherein the geometry of the abrasive units is not consistent between all the discs. 10
    [0016]
    Roller as claimed in one of the preceding claims, comprising a radially outer surface having an array of abrasive units (19; 191,192) arranged in a predefined pattern, wherein the pattern is configured to provide flow channels between abrasive units through the radially outer surface. 15
    [0017]
    An axial segment for a roll as claimed in any one of claims 1 to 16, wherein a radially outwardly facing surface of one or more abrasive unit (s) is provided with a pattern. abrasive micro-units of substantially smaller proportions than abrasive units.
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    同族专利:
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    法律状态:
    2017-03-24| CA| Change of address|Effective date: 20170217 |
    2017-03-27| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-16| CA| Change of address|Effective date: 20170517 |
    2018-03-26| PLFP| Fee payment|Year of fee payment: 3 |
    2020-03-25| PLFP| Fee payment|Year of fee payment: 5 |
    2021-03-29| PLFP| Fee payment|Year of fee payment: 6 |
    2021-12-31| PLSC| Publication of the preliminary search report|Effective date: 20211231 |
    优先权:
    申请号 | 申请日 | 专利标题
    GBGB1504759.0A|GB201504759D0|2015-03-20|2015-03-20|Abrading tool for a rotary dresser|
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