Abstract
A deburring tool (10) for deburring at least one through-hole (24) in a workpiece, the surface (38) of the through-hole (24) to be deburred located on the side away from the deburring tool (10), the tool comprising a main body (12) with a tool shaft (14) and a tool head (16), the tool shaft (14) having a clamping section (16) and the tool head (16) having a guide section (20) with a guide sleeve (22) extending along or parallel to an axis of rotation (36). The tool head (16) comprises at least one flexible fibre (26) with an abrasive surface (28), which is permanently or detachably attached in the guide sleeve (22), the fibre (26) having a free length (L1) and the guide sleeve (22) having a length (L2), the free length (L1) and/or the length (L2) corresponding to at least the depth (T) of the through-hole (24).
Claims
1. A deburring tool for deburring at least one through-hole in a workpiece, an opening surface of the through-hole to be deburred being arranged on a side facing away from the deburring tool, comprising a main body having a tool shaft and a tool head, the tool shaft comprising a clamping section, the tool head comprising a guide section having a guide sleeve extending along or parallel to an axis of rotation, the tool head has at least one flexible fiber having an abrasive fiber surface which is permanently or detachably fixed in the guide sleeve, wherein the fiber has a free length and the guide sleeve has a length, wherein the free length and/or the length corresponds at least to a depth of the through-hole.
2. The deburring tool according to claim 1, wherein the fiber is guided within the guide sleeve along the axis of rotation.
3. The deburring tool according to claim 1, wherein at least two flexible fibers are guided in the guide sleeve parallel to the axis with respect to the axis of rotation.
4. The deburring tool according to claim 1, wherein at least three fibers are arranged about the axis of rotation in a circumferential direction in an evenly distributed manner about the axis of rotation on the guide sleeve.
5. The deburring tool according to claim 1, wherein the fiber is formed at least in sections as a plastic fiber, glass fiber, metal fiber, ceramic fiber and/or carbon fiber.
6. The deburring tool according to claim 1, wherein the fiber is configured as a bundle of individual filaments, or as an individual filament.
7. The deburring tool according to claim 1, wherein the fiber surface of the fiber is configured structured or textured in order to provide the abrasive effect on contact with the workpiece.
8. The deburring tool according to claim 1, wherein a weight is fastened to a front end of the fiber.
9. The deburring tool according to claim 1, wherein the length of the guide sleeve is changeably adjustable.
10. The deburring tool according to claim 1, wherein the at least one fiber is exchangeably mounted in the guide sleeve.
11. The deburring tool according to claim 1, wherein a stop is arranged on the guide section, which stop can execute a rotational movement relative to the guide sleeve, wherein the stop has a larger diameter than a largest diameter of the through-hole.
12. The deburring tool according to claim 11, wherein the stop has a stop ring and a stop sleeve.
13. The deburring tool according to claim 12, wherein the stop ring can execute a rotational movement with respect to the stop sleeve, wherein the stop sleeve is preferably mounted in a rotationally fixed manner with the guide sleeve and the stop ring is preferably mounted with the stop sleeve via a pivot bearing.
14. The deburring tool according to claim 11, wherein the stop and the guide sleeve can be displaced relative to one another in the axial direction to the axis of rotation.
15. The deburring tool according to claim 14, wherein the stop has a stop ring and a stop sleeve 4nd an axial guidance of the stop sleeve takes place along the guide sleeve by a guide pin which is arranged radially on the stop sleeve and a guide slot, wherein the guide pin engages in the guide slot.
16. A method for deburring using a deburring tool according to claim 1, comprising the following steps: inserting the deburring tool into a through-hole from an opposite side of the workpiece with respect to an opening surface to be deburred, wherein at least the fiber partially protrudes from the through-hole on the opening surface to be deburred, rotating the deburring tool to a nominal speed, wherein the at least one fiber preferably strives away at right angles with respect to the guide sleeve due to centrifugal force, pulling the deburring tool out of the through-hole during the rotational movement of the deburring tool, so that deburring is effected on the opening surface of the through-hole, wherein the deburring angle depends on speed and longitudinal movement of the deburring tool.
17. The method for deburring using a deburring tool according to claim 16, wherein during the rotational movement about the axis of rotation, the fiber surface of the fiber comes into contact with the opening surface of the through-hole to be deburred, wherein a deburring effect takes place through the fiber surface.
18. The method for deburring using a deburring tool according to claim 17, wherein the speed of the deburring tool determines tensile stress in the fiber.
19. The method for deburring using a deburring tool according to claim 16, wherein the workpiece is a plastic, composite fiber or lightweight board.
20. The deburring tool according to claim 3, wherein both fibers have the same free length.
21. The deburring tool according to claim 4, wherein four to seven fibers are arranged about the axis of rotation in the circumferential direction in an evenly distributed manner about the axis of rotation on the guide sleeve, and all fibers have the same length.
22. The deburring tool according to claim 8, wherein a cross-sectional size of the weight is less than or equal to a cross-sectional size of the fiber.
23. The deburring tool according to claim 1, wherein a length of the guide sleeve is telescopically changeable in length.
24. The deburring tool according to claim 13, wherein the stop sleeve is mounted in a rotationally fixed manner with the guide sleeve, and the stop ring is mounted with the stop sleeve via a pivot bearing.
25. The deburring tool according to claim 15, wherein the guide slot is introduced in an axial longitudinal direction on the guide sleeve.
Description
DRAWINGS
[0039] Further advantages result from the present description of the drawing. Embodiments of the invention are illustrated in the drawings. The drawings, description, and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.
[0040] Shown are:
[0041] FIGS. 1A, IB, 1C, 1D, 1E and 1F a representation of several method steps of a method for deburring using a deburring tool according to the invention;
[0042] FIG. 2 a schematic sectional illustration of a longitudinal section through an embodiment of a deburring tool according to the invention in two method steps;
[0043] FIG. 3 a schematic sectional illustration of a longitudinal section through an embodiment of a deburring tool according to the invention with a stop;
[0044] FIGS. 4A and 4B an illustration of an embodiment of a deburring tool according to the invention;
[0045] FIGS. 5A and 5B a representation of an embodiment of a deburring tool according to the invention in longitudinal section and external view;
[0046] FIGS. 6A and 6B a representation of an embodiment of a deburring tool according to the invention in longitudinal section and external view;
[0047] FIG. 7 en illustration of an embodiment of a deburring tool according to the invention;
[0048] FIG. 8 a detail from FIG. 7 in an isometric illustration;
[0049] FIGS. 9A, 9B, 9C and 9D different top views of different embodiments of tool heads in the direction of the longitudinal axis of different embodiments of deburring tools according to the invention having a different number of fibers.
[0050] In the figures, identical or similar components are numbered with the same reference numerals.
[0051] FIGS. 1A, 1B, 1C, 1D, 1E and 1F show various method steps of the method for deburring using a deburring tool according to the invention. In the illustrated embodiment, the debarring tool 10 has a fiber 26 which is configured many times longer than the thickness of the workpiece 25, that is, than the depth T of the through-hole 24, and is arranged on the axis of, rotation of the deburring tool 10. The fiber 26 is clamped on the tool head 18 via a guide section 20 configured as a guide sleeve 22. The tool shaft 14 has a clamping section 16 with which it can be clamped in a machine tool. Furthermore, in the illustrated embodiment of the deburring tool 10, the guide sleeve 22 is designed longer than the thickness of the workpiece 25. In the step depicted in FIG. 1A, the deburring tool 10 is inserted into a through-hole 24 which has been introduced into a workpiece 25. The deburring tool 10 is guided into the through-hole 24 such that the fiber 26 on the opposite side of the workpiece 25 protrudes from the through-hole 24 with respect to the deburring tool 10, so that the fiber surface 28 can make contact with the opening surface 38 to be deburred (not visible in this view). In the step depicted in FIG. 1B, the deburring tool 10 is now rotated so that the fiber 26 experiences a deflection through the rotational movement R with respect to the longitudinal axis of the deburring tool 10. Upon reaching a nominal speed, illustrated in the step depicted in FIG. 1C, the fiber 26 is arranged essentially at right angles with respect to the guide sleeve 22 due to the centrifugal force. In the step depicted in FIG. 1D, the deburring tool 10 is moved longitudinally in the direction of the axis of rotation (to the right in the arrangement illustrated), so that the free length of the fiber 26 is drawn through the through-hole 24. In this case, the fiber 26 having the fiber surface 28 is in contact with the opening surface 38 of the through-hole 24 to be debarred, by which the deburring effect is achieved. During the longitudinal displacement of the deburring tool 10, the fiber 26 exerts a rotational movement R using the deburring tool 10. In the step depicted in FIG. 1E, the fiber end has almost reached the through-hole 24 due to the longitudinal displacement, so that the fiber 26 is only minimally deflected from the axis of rotation 36. The rotational movement R is terminated in this embodiment only when the deburring tool 10 has been completely moved out of the through-hole 24, in the step depicted in FIG. 1F. The workpiece 25 can constitute a plastic, composite fiber or lightweight board.
[0052] FIG. 2 shows a schematic sectional illustration of a longitudinal section through an embodiment of a deburring tool 10 according to the invention, wherein the deburring tool 10 is illustrated for two different method steps. The left representation illustrates the step depicted in FIG. 1A, the right representation the step depicted in FIG. 1A. It can be seen from FIG. 2 that the length L1 of the fiber 26 and the length L2 of the guide sleeve 22 is configured many times longer than the depth T of the through-hole 24. Furthermore, it is clear that in the illustration on the right the fiber surface 28 is in contact with the opening surface 38 for deburring in such a way that deburring or countersinking of the through-hole 24 can be achieved. The deburring tool 10 is arranged in the through-hole 24 or on the central axis of the through-hole 24 such that the remaining section of the free length of the fiber 26 is not in contact with the surface of the through-hole 24. If the deburring tool 10 is moved to the right in the illustration on the right, the opening surface 38 to be deburred is in contact with the fiber surface 28 over the entire displacement path or displacement period. A schematic sectional illustration of a longitudinal section through an embodiment of a deburring tool 10 according to the invention is illustrated with a stop 42 in FIG. 3. The main body 12, consisting of tool shaft 14 and tool head 18, is configured to be displaceable in the longitudinal direction relative to the axis of rotation of the deburring tool 10 against the stop 42. As a result, the fiber 26 can also be displaced in the longitudinal direction of the deburring tool 10 in such a way that it protrudes to different extents beyond the stop 42 (on the left in the illustration). The stop 42 consists of a stop sleeve 46 and a stop ring 44, wherein the stop ring 44 and the stop sleeve 46 are mounted with one another via a pivot bearing 52. The pivot bearing 52 can be configured as a roller bearing or plain bearing, and therefore as a ball bearing, As a result, the stop ring 44 can execute a rotational movement with respect to the stop sleeve 46, wherein the stop sleeve 46 is mounted in a rotationally fixed manner with the guide section 20 in the form of a guide sleeve 22.
[0053] FIGS. 4A and 4B show an external view of a deburring tool 10 according to FIG. 3. The deburring tool 10 is centrally aligned on a through-hole 24. FIG. 4A shows a situation in which the fiber 26 is arranged almost completely within the stop 42. In FIG. 4B, the fiber 26 at least partially projects beyond the stop 42. The stop 42 is displaced relative to the main body 12 via a guide pin 50 which runs in a guide slot 34, wherein the guide slot 34 is arranged in the guide sleeve 22 in the longitudinal direction. The length of the guide slot 34 determines the maximum possible longitudinal displacement of the stop 42 relative to the main body 12.
[0054] FIGS. 5A and 5B show an arrangement in which the stop 42 is in contact with a workpiece 25 such that the fiber 26 is arranged centrally with respect to the through-hole 24. This is illustrated by the sectional view in FIG. 5B. Accordingly, the axis of rotation 36 and the axis of the through-hole 24 lie on one line in this illustration.
[0055] The situation after the fiber 26 has been extended into the throughhole 24 is shown in FIGS. 6A and 6B, wherein it is clarified in FIG. 6B that the free length of the fiber 26 is configured longer than the depth of the through-hole 24. In the view illustrated, the fiber 26 therefore completely engages in the through-hole 24, while the guide sleeve 22 is arranged outside the through-hole 24.
[0056] FIGS. 7 and 8 show a situation according to FIG. 6A and 6B, wherein the fiber 26 performs a rotational movement R.
[0057] In the embodiment of the deburring tool 10 according to FIG. 7, a weight 32 is arranged at the end of the fiber 26. The weight 32 has a small dimension compared to the length of the fiber 26, wherein the crosssectional size of the weight 32 is configured less than or equal to the cross-sectional size of the fiber.
[0058] The isometric representation in FIG. 8 shows how the fiber surface 28 comes into contact with the opening surface 38 to be deburred during a rotational movement R, wherein the entire opening surface 38 to be deburred is touched by the fiber surface 28 once in the circumference during a rotational movement R through 360.
[0059] FIGS. 9A, 9B, 90 and 9D show different top views of different embodiments of tool heads of deburring tools 10 according to the invention, wherein the different deburring tools 10 have a different number of fibers 26. FIG. 9A shows an embodiment of a deburring tool 10 according to the invention which has only one fiber 26. The fiber 26 is arranged centrally on the axis of rotation 36 and is guided in the guide sleeve 22, which constitutes the guide section 20 of the tool head 18. In the embodiment according to FIG. 9B, the deburring tool 10 according to the invention have two fibers 26 which are arranged symmetrically with respect to a transverse axis which runs through the axis of rotation 36 of the deburring tool 10. Likewise, the two fibers 26 are arranged symmetrically with respect to the axis of rotation 36, so that during a rotational movement of the deburring tool 10, no imbalance is exerted on the guide sleeve 22 by the centrifugal force of the two fibers 26. FIG. 9C shows an embodiment of a deburring tool according to the invention having three fibers 26, wherein all three fibers 26 are clamped and fixed in the guide sleeve 22 at the same distance from one another. Such an arrangement can also prevent an imbalance on the tool head 18 during a rotational movement of the deburring tool 10. In the embodiment according to FIG. 9D, the deburring tool 10 according to the invention has six fibers 26, wherein all fibers 26 about the axis of rotation 36 in the circumferential direction are arranged in an evenly distributed manner about the axis of rotation 36 on the guide sleeve 22.
[0060] In all embodiments according, to FIGS. 9A, 9B, 9C, and 9D, the respective fibers 26 can each have the same length or can be configured with different lengths and can be installed interchangeably. However, all the fibers 26 of a deburring tool 10 preferably have the same length.
LIST OF REFERENCE NUMBERS
[0061] 10 deburring tool
[0062] 12 main body
[0063] 14 tool shaft
[0064] 16 clamping section
[0065] 18 tool head
[0066] 20 guide section
[0067] 22 guide sleeve
[0068] 24 through-hole
[0069] 25 workpiece
[0070] 26 fiber
[0071] 28 fiber surface
[0072] 30 fiber bundle
[0073] 32 weight
[0074] 34 guide slot in guide sleeve
[0075] 36 axis of rotation
[0076] 38 opening surface to be deburred
[0077] 42 stop
[0078] 44 stop ring
[0079] 46 stop sleeve
[0080] 50 guide pin
[0081] 52 pivot bearing
[0082] T depth of the through-hole
[0083] L1 length of the fiber
[0084] L2 length of the guide sleeve
[0085] R rotational movement
