Stop for a rotary tool

Abstract

A stop (1) for a rotary drilling or milling tool, comprising a rotating tool (2) rotatably coupled within a cage (3), the rotating tool (2) comprising a shaft (10), the rotating tool (2) and the cage (3) being rotatably coupled by at least one rolling bearing (4). The at least one rolling bearing (4) comprises a first ring (6) mounted with an interference fit within the cage (3) and comprises a second ring (8) mounted with a sliding fit on the rotating tool (2).

Description

[0001] TITLE: STOP FOR A ROTARY TOOL

[0002] TECHNICAL FIELD

[0003] The invention relates to the field of machining stops and more particularly to stoppers.

[0004] STATE OF PRIOR ART

[0005] In a known manner, fly-cutting stops are mechanical parts that include a shaft mounted to rotate in a cage, the shaft having a cutting end that emerges from the cage at a precise dimension.

[0006] As is known, rotational mounting is achieved using ball bearings. For example, document WO2016 / 023944 describes a thrust bearing in which a sleeve is interposed between the shaft and the cage. It is noteworthy that the thrust bearing proposed in this document comprises bearings, each mounted with a ring in an interference fit on the shaft and a ring in a sliding fit within the cage. It is noteworthy that this is a traditional ball bearing mounting for rotating shafts, but it complicates the thrust bearing structure.

[0007] Furthermore, the stop described in document WO2016 / 023944 uses a nut system to adjust the dimension of the cutting end of the shaft protruding from the cage. However, nut adjustment is unsatisfactory because it lacks precision and can easily become misaligned.

[0008] In this context, it is necessary to provide a fly stopper with a simpler and more reliable structure.

[0009] DESCRIPTION OF THE INVENTION

[0010] To this end, according to a first aspect, a stop is proposed for a rotary drilling or milling tool, comprising a rotating tool coupled in rotation within a cage, the rotating tool comprising a shaft, the rotating tool and the cage being coupled in rotation by at least one bearing. The at least one bearing comprises a first ring mounted with an interference fit in the cage and comprises a second ring mounted with a sliding fit on the rotating tool.

[0011] In a particularly ingenious way, the choice of a sliding fit on the tool facilitates the disassembly and reassembly of the rotating tool, for example, to perform a sharpening operation. Furthermore, the sliding fit eliminates the need for glue, unlike some prior art systems. Thus, the proposed bevel stop has a simpler and more reliable structure than prior art systems.

[0012] According to a particular arrangement, the second ring of at least one bearing is mounted with a sliding fit directly onto the shaft.

[0013] According to a particular arrangement, the rotating tool includes a sleeve mounted tightly around the shaft.

[0014] According to a particular arrangement, the sleeve includes a handle having a shoulder bearing against a lateral face of the second ring of the bearing.

[0015] According to a particular arrangement, the sleeve includes a handle mounted tightly on the shaft and includes a tubular portion interposed between the shaft and the cage so that the second ring of at least one bearing is mounted with a sliding fit on the tubular portion of the sleeve.

[0016] According to a particular arrangement, the sleeve is fitted around the shaft.

[0017] According to a particular arrangement, the thrust bearing comprises two bearings separated by a spacer.

[0018] BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features of the invention mentioned above, as well as others, will become clearer upon reading the following description of at least one exemplary embodiment, said description being made in relation to the attached drawings, among which: [Fig. 1] schematically illustrates, in cross-section, a fly stop according to a first embodiment of the invention;

[0020] [Fig. 2] schematically illustrates, in cross-section, a fly stop according to a second embodiment of the invention;

[0021] DETAILED DESCRIPTION OF IMPLEMENTATION METHODS

[0022] Stop

[0023] As shown schematically in Figs. 1 and 2, a stop 1 is proposed for a rotary drilling or milling tool.

[0024] The stop 1 comprises a rotating tool 2 coupled in rotation within a cage 3.

[0025] The rotating tool 2 includes a shaft which will be described below.

[0026] The rotating tool 2 and the cage 3 are coupled in rotation by at least one bearing 4.

[0027] According to a particularly ingenious arrangement of the invention, the bearing 4 comprises a first ring 6 mounted with a tight fit in the cage 3 and comprises a second ring 8 mounted with a sliding fit on the rotating tool 2.

[0028] It is noteworthy that such an adjustment is counterintuitive. Indeed, in a conventional manner, a bearing is mounted with a ring fitted with an interference fit on the rotating element and a ring fitted with a sliding fit in the stationary element.

[0029] In this case, the choice of a sliding fit on the tool facilitates the disassembly and reassembly of the rotating tool, for example, to perform a sharpening operation. Furthermore, the choice of a sliding fit on the tool eliminates the need for glue, as is sometimes the case in certain prior art systems.

[0030] As will be detailed below, the rotating tool 2 comprises a shaft 10 and a sleeve 18.

[0031] TREE

[0032] The rotating tool 2 includes a shaft 10.

[0033] The shaft 10 can typically be made of turned and machined steel. The shaft 10 includes a cutting end 12. Typically the cutting end 12 includes blades machined from solid or added carbide inserts.

[0034] The cutting end has an axial dimension 14 of the portion of shaft 10 that emerges from the cage. 3. As previously stated, the shaft 10 must emerge from the cage 3 precisely according to the dimension of the axial dimension 14. In a particularly ingenious way, the adjustment of the axial dimension 14 is made possible by a sleeve 18 press-fitted onto the shaft 10; the precise position of the sleeve 18 ensures the accuracy of the axial dimension 14. The sleeve 18 will be described below.

[0035] Cage

[0036] According to the embodiments presented here, cage 3 is a cylindrical metal part. According to other embodiments, cage 3 could have a different geometry and be made of a different material.

[0037] Cage 3 has a bore 20 in which two ball bearings 4 are positioned.

[0038] It is specified that, according to the embodiments presented here, bearings 4 are ball bearings. However, according to other embodiments, bearings 4 could be tapered roller bearings or needle roller bearings.

[0039] Similarly, according to the embodiments presented here, the cage 3 has two bearings separated by a spacer 22. It is specified that according to other embodiments the number of bearings can vary from a single bearing to as many as necessary (for example, four or six).

[0040] Each bearing 4 has a first ring 6 mounted with a tight fit in the cage 3 and includes a second ring 8 mounted with a sliding fit on the rotating tool 2.

[0041] Sleeve

[0042] As previously mentioned, the stop 1 also includes the sleeve 18.

[0043] In a particularly ingenious way, the sleeve 18 is tightly fitted around the shaft 10. More precisely, the sleeve 18 can be shrink-fitted onto the shaft 10. According to other embodiments, the sleeve 18 could be glued or welded onto the shaft 10. According to another embodiment, the sleeve 18 could be a single piece with the shaft 10, by being directly machined onto the shaft 10.

[0044] Regardless of the embodiment, the sleeve 18 includes a handle 24 with a shoulder 26 bearing against a lateral face of the second ring 8 of the bearing(s) 4. This technical arrangement is particularly ingenious. Indeed, the bearing of the shoulder 26 against the second ring 8 of one of the bearings 4, combined with the tight connection of the sleeve 18 to the shaft 10, allows for precise adjustment of the axial dimension 14. In other words, the sleeve 18 according to the invention very advantageously eliminates the need for prior art screw-nut adjustment systems.

[0045] According to a first embodiment, the sleeve 18 includes only the handle 24.

[0046] According to a second embodiment, the sleeve 18 further comprises a tubular portion 28. The tubular portion 28 is located in the extension of the shoulder 26.

[0047] Regardless of the method of embodiment, sleeve 18 can be made of metal or composite material.

[0048] First method of implementation

[0049] According to the first embodiment shown schematically in Fig. 1, the second ring 8 of each bearing 4 is mounted, with a sliding fit, directly onto the shaft 10.

[0050] According to this first embodiment, the shaft 10 has a groove adapted to receive an elastic ring 30. A spring 32 is positioned around the shaft between the elastic ring 30 and the second ring 8 of one of the bearings 4. According to another embodiment, the spring 32 can be replaced by or combined with a vibration damping system.

[0051] According to the embodiment presented here, the stop 1 has two bearings 4.

[0052] The shoulder 26 rests against the second ring 8 of a first bearing 4 and the spring 32 rests against the second ring 8 of a second bearing 4.

[0053] Second embodiment According to the second embodiment shown schematically in Fig. 2, the sleeve 18 includes the tubular portion 28.

[0054] The tubular portion 28 is interposed between the shaft 10 and the second ring 8 of the, or of each, bearing 4. In other words, the second ring 8 of the, or of each, bearing 4 is mounted with a sliding fit on the tubular portion 28 of the sleeve 18.

[0055] According to this embodiment, an end region of the tubular portion 28 includes a groove adapted to receive the elastic ring 30.

[0056] According to the embodiment presented here, the stop 1 has two bearings 4.

[0057] The shoulder 26 is in contact with the second ring 8 of a first bearing 4 and the elastic ring 30 is in contact with an O-ring 34 which is itself in contact with the second ring 8 of a second bearing 4.

Claims

DEMANDS 1. Stop (1) for a rotary drilling or milling tool, comprising a rotating tool (2) rotationally coupled in a cage (3), the rotating tool (2) comprising a shaft (10), the rotating tool (2) and the cage (3) being rotationally coupled by at least one bearing (4), the stop (1) being characterized in that at least one bearing (4) comprises a first ring (6) mounted with an interference fit in the cage (3) and comprises a second ring (8) mounted with a sliding fit on the rotating tool (2).

2. Stop (1) according to claim 1, wherein the second ring (8) of at least one bearing (4) is mounted with a sliding fit directly on the shaft (10).

3. Stop (1) according to any one of claims 1 or 2, wherein the rotating tool (2) comprises a sleeve (18) mounted tightly around the shaft (10).

4. Stop (1) according to claim 3, in which the sleeve (18) includes a handle (24) having a shoulder (26) bearing against a lateral face of the second ring (8) of the bearing (4).

5. Stop (1) according to claim 3, in which the sleeve (18) includes a handle (24) mounted tight on the shaft (10) and includes a tubular portion interposed between the shaft (10) and the cage (3) such that the second ring (8) of at least one bearing (4) is mounted with a sliding fit on the tubular portion of the sleeve (18).

6. Stop (1) according to any one of claims 3 to 5, wherein the sleeve (18) is shrink-fitted around the shaft (10).

7. Stop (1) according to any one of the preceding claims, comprising two bearings (4) separated by a spacer (22).

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