Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/36—Mechanical coupling means
  • G02B6/38—Mechanical coupling means having fibre to fibre mating means
  • G02B6/3807—Dismountable connectors, i.e. comprising plugs
  • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
  • G02B6/3863—Details of mounting fibres in ferrules; Assembly methods; Manufacture fabricated by using polishing techniques
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
  • B24B19/22—Single-purpose machines or devices for particular grinding operations not covered by any other main group characterised by a special design with respect to properties of the material of non-metallic articles to be ground
  • B24B19/226—Single-purpose machines or devices for particular grinding operations not covered by any other main group characterised by a special design with respect to properties of the material of non-metallic articles to be ground of the ends of optical fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B41/00—Component parts such as frames, beds, carriages, headstocks
  • B24B41/06—Work supports, e.g. adjustable steadies
  • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
  • B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
  • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
  • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally

Definitions

• the invention relates to a device for concentric cylindrical grinding of a workpiece and a new method for cylindrical grinding of blanks.
• the bore can be drilled or reworked centrally, or after the bore has been produced, the outer diameter can be machined centrally to the bore.
• the present invention is concerned with the second manufacturing method, since this method is itself more advantageous than the first manufacturing method.
• the polished fiber optic reference in which the bore must be exactly centered in relation to the end face or the outer diameter, is supported by a cone of a tip.
• the other side is designed for engagement with the rotary drive.
• a comparable structure in accordance with JP-A- ⁇ -208042 also provides for storage between tips, the torque being transmitted by a kind of rotating heart. Here, too, the problem described above has not been eliminated.
• Torque transmission which is to be solved by using a pressure element on the side of the ferrule opposite the grinding wheel. This may allow a slip in the drive so that the grinding process cannot be optimized.
• JP-A-10-113852 presents a similar problem with its torque transmission via a rubber roller, with this prior art additionally having the problem of storage between tips mentioned at the outset.
• the German Pat No. 22656 (Imperial Patent Office) is based on a different approach and for a different purpose. This patent is about a holding mandrel for grinding the outside of a gun barrel. The radial guide 5 is separated from the axial support. Here too - albeit in a completely different area - the task is similar: a constant wall thickness is to be achieved at a specific point on the gun barrel. Theoretically, this also leads to a concentric build-up of the rifle barrel, albeit only exactly at the ground point.
• JP-A-10-286748 in the case of cylindrical grinding, the support of a ferrule is not accomplished - as in most other cases - with the use of a pure cone or tip.
• the radial guidance is accomplished here by a cylindrical part which is formed on a cone by insert milling.
• the required axial support is achieved with a small, flat surface that results from plunge milling.
• this small, flat, annular surface is not further defined in JP-A.
• the cylindrical part (or mandrel) can also be inserted into the conical base body.
• the support by the flat ring surface is not about a specific form of axial support, but only about the avoidance of the hole edge breaking out by using a Konuses.
• the solution of JP-A prevented the edge-damaging effect of the cone and, as a positive side effect, made it possible for the ferrule to be guided radially by the cylindrical part.
• the known solution avoids the risk of knocking out and ascending.
• the pressure on the ferrule in the axial direction can be minimized, since the radial guide is given by the mandrel, and not by the edge approximately central concern of a cone at a Boh ⁇ .
• the device shown in JP-A has the following problem: In order to achieve concentricity, as shown in diagram 4b (average approx. 0.5 ⁇ m; or micron), the bore clearance between the mandrel and the workpiece must be extremely small , It must not be larger than 0.5 ⁇ m of the stated concentricity. On the other hand, minimal play must be guaranteed so that the mandrel can be inserted into the bore and rotated. The system only works with the specified accuracy if the fit clearance is a maximum of 0.5 ⁇ m.
• the bore tolerance of the ferrules is 1.0 ⁇ m - also for the single-mode ferrules described in JP-A.
• the mandrel is always subject to a certain amount of wear and bending stress.
• the diameter tolerance of the hole has less of an influence on the quality of the fiber plug-in connection than the position or concentricity of the hole, since the fiberglass conductor is centered again when gluing in, even if the diameter fluctuates due to the adhesive. In contrast, concentricity errors cannot be compensated for by the adhesive.
• the invention is therefore based on the object of finding a simple, secure centering bearing for workpieces, for example ferrules, in which, on the one hand, at least the decisive end face can be optimally achieved without additional reworking or measuring process, while concentrically concentrating Regrinding the outer circumference of a blank under mass production conditions.
• the invention provides that, in deviation from the known state of the art with an annular flat bearing surface, the axial support surface has a small eccentric support point which, due to its eccentric position and the associated frictional force during support, leads to a reaction force on the ferrule which is capable to compensate for any discrepancies in diameter between the mandrel or wire and the bore.
• the eccentric support according to the invention ensures that the axial contact surface between workpiece and support always remains defined at the same location, i.e. not rotating or moving in an uncontrolled manner) even if the face of the workpiece is not exactly flat. Furthermore, the workpiece is always pushed away in the same direction (shear between support, mandrel and workpiece), which results in elimination of play in one direction.
• the position of the support point ensures that the workpiece is pressed away on the side in which the forces of the grinding wheel also act. This means that even with a large amount of play (up to approx. 3 ⁇ m) between the bore and the mandrel, grinding can be done concentrically below 0.5 ⁇ m.
• blanks of lower quality can be processed in the quality-critical area.
• the condition of the hole edge is imprecise, and also differences in the hole diameter or wear on the mandrel have no influence.
• the invention also eliminates the need for a complicated pressure force control for the clamping device of the blank. In addition, operational safety is increased, rejects are reduced and centering quality is improved.
• Fig.l an inventive support block with wire guide
• FIG. 2 shows the support block and the wire guide in engagement with a blank and in counter pressure with a support bearing tip in front of a grinding wheel
• FIG. 3 shows the support block in two states: above in the working state and below in the charging state with the wire withdrawn; 4 shows the representation according to FIG. 2 with a schematic wire feed device;
• FIG. 5 shows a detail of a variant of a support block with a rounded support surface
• FIG. 6 shows a variant of the support block according to Figure 5 in side and front view
• FIG. 7 shows an end view of the support block according to FIG. 6 next to a grinding wheel
• FIG. 9 shows an enlargement of the area between the support block and the blank as shown in FIG. 8;
• a new type of support block 1 becomes the center of the invention. It is namely not equipped with a conical tip but with a cylindrical mandrel or, as shown, with a support wire 2 through a wire bore 12.
• the support block 1 can defacto be a previously machined ferrule blank, so that any worn out support blocks can be replaced very inexpensively.
• a mandrel or wire 2 is used in the rotation region around the axis of the bore 16, the bore is centered and not over the edge of the bore 16. This reduces the risk of wear.
• the support block 1 and / or a counter-bearing support bearing tip 7 can be axially displaceable in order to enable a blank 6 to be clamped.
• the support bearing tip 7 is not subject to the high mechanical friction loads specified above, since there the blank 6 rotates together with the support bearing tip 7.
• a second support block with a mandrel or a support wire 2 could also be provided, this side preferably taking over the torque transmission known per se.
• a known grinding wheel 8 is used to grind the outside diameter.
• the feed or retraction device for the support wire 2 is only symbolically by a wire holder 10 indicated in Figure 4.
• the support wire 2 according to the invention is an inexpensive variant of the conventional tip bearings; especially since when the wire is worn, a piece of wire is simply pushed in in the feed direction 5, while when a mostly very expensive tip (eg diamond) is worn, it has to be completely replaced.
• a mostly very expensive tip eg diamond
• the support surface 20 can also be designed as a rounded head 13 (FIG. 5).
• the rounded head 13 forms a cambered support surface 22 for the workpiece.
• it can also, preferably, be equipped with an asymmetrically arranged base 14, such as e.g. shown in Fig.6.
• the support point 14, as can be seen in particular from FIGS. 8-10, causes a reaction force 18 to be achieved on the workpiece during operation, which results from the frictional forces at the support point 14 together with the rotation of the blank 6 around the support wire 2.
• the position of the support point 14 is preferably selected depending on the direction of rotation of the workpiece in order to ensure that the workpiece is pushed away from the grinding wheel 8.
• FIG. 11 and 12 show variants of the support block, which could take on many known forms within the scope of the invention and its function. For example, it could be designed as a chuck.
• a simple solution hires prismatic support block 31a with a wire hole through which a support wire 2 can be pushed into the workpiece 6 as in the above-mentioned construction.
• the support wire 2 is axially fixed in the wire bore by a clamping screw 25.
• the support block 31a has a flat support surface 30 or a support surface with a support point, as described above.
• the support wire 2 can also be welded or glued to the support body.
• the example acc. 12 replaces the monolithic support block 31a with a support block 31b which consists of two collet parts 27 and 28 which can also be connected to one another in one piece.
• the two parts 27, 28 are held against one another by means of the clamping screw 25 and thus clamp a support wire 2 in a flute 26.
• a flat support surface 32 is formed on the end faces of the parts 27 and 28.
• a base solution is also possible.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Grinding Of Cylindrical And Plane Surfaces (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4232211

Family Applications (1)

Country Status (5)

Cited By (6)

Families Citing this family (9)

Citations (3)

• 2000
  • 2000-12-20 CN CN00817672A patent/CN1413138A/zh active Pending
  • 2000-12-20 WO PCT/IB2000/001974 patent/WO2001045902A1/de active Application Filing
  • 2000-12-20 AU AU22116/01A patent/AU2211601A/en not_active Abandoned
  • 2000-12-20 JP JP2001546433A patent/JP2003517937A/ja active Pending
  • 2000-12-20 KR KR1020027006961A patent/KR20020072541A/ko not_active Application Discontinuation

Patent Citations (3)

Non-Patent Citations (1)

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