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1. WO2020108770 - TOOL SUPPORTER WITH ADJUSTMENT SYSTEM AND METHOD FOR ALIGNING A TOOL USING THE SAME

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[ EN ]

Claims

1. Tool supporter (10) for supporting a tool, the tool (10) supporter having a tool supporter body (20) which defines a longitudinal tool-supporter-rotation-axis (30) and which comprises :

- a machine interface (40) configured to be connected to a rotary driving machine in a torque-transmitting manner,

- a tool interface (50) fixed to the machine interface (40) and configured to support a tool, and

- an adjusting system (60) arranged, along the tool- supporter-rotation-axis (30), between the machine

interface (40) and the tool interface (50), the adjusting system (60) comprising

- an outer circumferential groove (70) formed in the tool supporter body (20) and extending around the tool-supporter-rotation-axis (30), wherein the outer circumferential groove (70) comprises two lateral groove walls opposite (75, 76) to each other,

- a plurality of screw holes (80) which are arranged along the circumferential groove (70) in a manner to be circumferentially spaced apart from each other and which each extend in a radial direction with respect to the tool-supporter-rotation-axis

(30) , and

- a plurality of adjustment screws (90) to be inserted into the screw holes (80),

wherein each screw hole (80) comprises a radial inner threaded portion (100) and a radial outer sliding portion (110),

wherein each adjustment screw (90) comprises a leading threaded portion (120) configured to engage the radial inner threaded portion (100) of the corresponding screw hole (80), and a trailing screw head (130) configured to slidably engage the radial outer sliding portion (110) of the corresponding screw hole (80) to form a respective slide engagement (135) , and

wherein said respective slide engagement (135) comprises a radially tapering structure (140) such that by screwing the respective adjustment screw (90) into the corresponding screw hole (80) the respective trailing screw head (130) applies a lateral spreading force (145) to the lateral groove walls (75, 76) via the radially tapering structure (140) of the respective slide engagement (135) to cause a local and lateral spreading of the groove (70), by which the tool interface (50) is correspondingly tilted relative to the machine interface (40) around a corresponding tilt axis transverse to the tool- supporter-rotation-axis (30).

2. Tool supporter (10) according to claim 1, wherein the tool supporter (10) is formed as a tool holder (150), wherein the tool interface (50) is configured to fixedly attach a separate tool to the tool holder (150) in a releasable manner, wherein, optionally, the tool holder (150) is formed as shrink-fit tool holder, wherein the tool interface (50) is configured to fixedly attach the separate tool to the shrink-fit tool holder via thermal shrinking in a releasable manner.

3. Tool supporter (10) according to claim 1, wherein the tool interface (50) is integrally formed with a tool (250) in one piece.

4. Tool supporter (10) according to any of the preceding claims, wherein the circumferential groove (70) has a depth

(D) which is at least 20% of the radius (R) of the tool supporter body (20) at the axial level of the circumferential groove (70), wherein, optionally, the depth (D) of the circumferential groove (70) is in a range of 20%-40% of the said radius (R) of the tool supporter body (20) .

5. Tool supporter (10) according to any of claims 1-3, wherein the circumferential groove (70) has a depth (D) which is at least 120% of a core hole diameter (CD) corresponding to a thread size provided in the plurality of screw holes (80) by the respective radial inner threaded portion (100), wherein, optionally, the circumferential groove (70) has a depth (D) which is in a range of 120%-200% of a core hole diameter (CD) corresponding to a thread size provided in the plurality of screw holes (80) by the respective radial inner threaded portion (100) .

6. Tool supporter (10) according to any of the preceding claims, wherein the radially tapering structure (140)

comprises at least one of the lateral groove walls (75, 76) being inclined, with a corresponding tool-supporter-body-sided inclination (160), in a manner so that, along a radially inward direction relative to the tool-supporter-rotation-axis (30), it approaches the respective other lateral groove wall (75, 76) .

7. Tool supporter (10) according to any of the preceding claims, wherein the radially tapering structure (140)

comprises the radial outer sliding portion (110) of a

respective screw hole (80) having a conical shape so as to taper, with a corresponding tool-supporter-body-sided

inclination (160), in a radially inward direction relative to the tool-supporter-rotation-axis (30).

8. Tool supporter (10) according to any of the preceding claims, wherein the radially tapering structure (140)

comprises the trailing screw head (130) of a respective

adjustment screw (90) having a conical shape so as to taper, with a corresponding screw-head-sided inclination (170), in the direction from its trailing screw head (130) toward its leading threaded portion (120) .

9. Tool supporter (10) according to claims 7 and 8, wherein the corresponding tool-supporter-body-sided

inclination (160) corresponds to the corresponding screw-head sided inclination (170).

10. Tool supporter (10) according to any of the preceding claims, wherein the plurality of screw holes (80) comprises three or more, optionally four, screw holes (80), and wherein the plurality of adjustment screws (90) comprises three or more, optionally four, adjustment screws (90).

11. Tool supporter (10) according to any of the preceding claims, wherein the tool supporter (10) further comprises a cover ring (180) adapted to be attached to the tool supporter (10) so as to cover the screw holes (80) and the adjustment screws (90) inserted into the screw holes (80).

12. Tool supporter (10) according to any of the preceding claims provided that in combination with claim 2, in

combination with a separate tool, wherein the separate tool is fixedly attached to the tool holder (150) in a releasable manner .

13. Tool supporter (10) according to any of the preceding claims provided that in combination with claim 3, in

combination with a tool (250), wherein the tool (250) is integrally formed with the tool interface (50) in one piece.

14. Method for aligning a tool supported by a tool supporter (10) according to any of claims 1 to 13, the method comprising the step of:

- reducing (S10) a runout of the tool with respect to the tool-supporter-rotation-axis (30) by adjusting at least one of the adjustment screws (90) of the plurality of adjustment screws (90) with respect to the respective screw hole (80) of the plurality of screw holes (80) .

15. Method according to claim 14, the method further comprising the steps of:

- pre-tightening (S20) the plurality of adjustment screws (90) with a predetermined torque in a crosswise sequence,

- rotating (S30) the tool about 360° and determining, at a free end of the tool, the rotational position of the highest runout of the tool in the radial direction

thereof,

- rotating (S40) the tool by 180° from the determined rotational position of the highest runout of the tool and determining the runout at this rotational position,

- rotating (S50) the tool back to the rotational position of the highest runout and adjusting the

adjustment screw (90) closest to this rotational position so as to equalize the runout at this rotational position and at the rotational position angularly offset by 180° from this rotational position,

- rotating (S60) the tool by 90° and determining the runout at this rotational position,

- rotating (S70) the tool by 180° and determining the runout at this rotational position and adjusting the adjustment screw (90) closest to this rotational position or the adjustment screw (90) opposite or substantially opposite to this rotational position so as to equalize the runout at this rotational position and at the rotational position angularly offset by 180° from this rotational position .

16. Method according to claim 15, wherein determining the runout respectively comprises measuring the elevation in the radial direction of the tool with respect to a fixed external point .

17. Method according to any of claims 14 to 16,

wherein the tool comprises a plurality of cutting edges formed on an outer surface thereof in a manner so as to be circumferentially spaced from each other, and

wherein the tool is supported by the tool interface (50) such that at least one of the plurality of the cutting edges is aligned to one of the plurality of adjustment screws (90).

18. Method according to claim 17, wherein the number of screw holes (80) as well as the number of adjustment screws (90) corresponds to the number of cutting edges.