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

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Tool supporter with adjustment system and method for aligning a tool using the same

Technical Field

The invention relates to a tool supporter with an

adjustment system for supporting a tool (e.g. a separate tool, a tool integrally formed with the tool supporter) and a method for aligning a tool using the same.

Background of the Invention

When rotating a tool supported by a tool supporter, the actual rotation of the tool may comprise a certain (radial) runout with respect to the intended rotational axis.

Especially, when using a conventional shrink-fit tool holder or a conventional tool supporter with an integrally formed tool, there are no easy measures for adjusting/improving a possible runout.

Summary of the Invention

The invention provides a tool supporter, which allows to correct a runout in an effective and easy manner. Further, the invention provides a corresponding method for aligning a tool using the same.

To this end, the invention provides a tool supporter for supporting a tool (e.g. a separate tool, a tool integrally formed with the tool supporter) , wherein the tool supporter has a tool supporter body, which (tool supporter body) defines a longitudinal tool-supporter-rotation-axis and which (tool supporter body) comprises: a machine interface configured to be connected to a rotary driving machine in a torque-

transmitting manner, a tool interface fixed to the machine interface and configured to support a tool (e.g. to support a tool in a torque-transmitting manner, e.g. to hold a tool, e.g. to be integrally formed with a tool in one piece), and an adjusting system (e.g. an adjusting mechanism) arranged, along the tool-supporter-rotation-axis, between the machine

interface and the tool interface, the adjusting system

comprising an outer circumferential groove formed in the tool supporter body (, wherein the circumferential groove comprises an open section facing to the radially outward direction with regard to the tool-supporter-rotation-axis, ) and extending around (e.g. all around) the tool-supporter-rotation-axis, wherein the outer circumferential groove comprises two lateral groove walls opposite to each other (, which (lateral groove walls) laterally delimit/define the groove), a plurality of screw holes which are arranged along (e.g. all along) the circumferential groove in a manner to be circumferentially spaced apart from each other (e.g. to be circumferentially spaced apart from each other with an equal (e.g. angular) spacing) and which (screw holes) each extend in a radial direction with respect to the tool-supporter-rotation-axis, and a plurality of adjustment screws to be inserted into (e.g. to be respectively inserted into) the screw holes, wherein each screw hole comprises a radial inner threaded portion (e.g. a threaded portion arranged at a radial inner position) and a radial outer sliding portion (e.g. a sliding portion arranged at a radial outer position) , wherein each adjustment screw comprises a leading (e.g. leading in the tightening direction of the adjustment screw) threaded portion configured to engage the radial inner threaded portion of the

corresponding screw hole, and a trailing (e.g. trailing in the tightening direction of the adjustment screw) screw head (e.g. a trailing screw head with sliding properties, e.g. a trailing screw head with sliding properties with respect to the radial outer sliding portion of the corresponding screw hole)

configured to slidably engage the radial outer sliding portion of the corresponding screw hole to form a respective slide engagement (e.g., in which the trailing screw head is in a force-transmitting contact with the radial outer sliding portion of the corresponding screw hole so as to form a respective slide engagement, ) , and wherein said respective slide engagement comprises a radially tapering structure (e.g. a structure tapering in a radial direction with respect to the tool-supporter-rotation-axis) such that by screwing the respective adjustment screw into the corresponding screw hole (e.g. by tightening the respective adjustment screw) the respective trailing screw head applies a lateral spreading force to the lateral groove walls via the radially tapering structure of the respective slide engagement to cause a local and lateral spreading (e.g. a lateral spreading

provided/caused in the location area of the corresponding screw hole) of the groove, by which (spreading) the tool interface is correspondingly tilted relative to the machine interface around a corresponding tilt axis transverse to the tool-supporter-rotation-axis .

The tool supporter may be formed as a tool holder, wherein the tool interface is configured to fixedly attach a separate tool to the tool holder in a releasable manner, wherein, the tool holder may be formed as a shrink-fit tool holder, wherein the tool interface is configured to fixedly attach the

separate tool to the shrink-fit tool holder via thermal shrinking in a releasable manner.

Alternatively, the tool interface (and, thereby, the tool supporter) may be integrally formed with a tool in one piece.

The tool (e.g. the separate tool) supported/to be

supported by the tool supporter may, e.g., be a machining tool, such as a drill or a reamer.

The circumferential groove may have a depth which is at least 20% of the radius of the tool supporter body at the axial level (seen along the tool-supporter-rotation-axis) of the circumferential groove, wherein, the depth of the

circumferential groove may be in a range of 20%-40% of the said radius of the tool supporter body, further optionally in a range of 20%-35% of the said radius of the tool supporter body, further optionally in a range of 25%-30% of the said radius of the tool supporter body.

The circumferential groove may have a depth which is at least 130% of a core hole diameter (e.g. a core hole diameter according to DIN ISO 1502:1996-12) corresponding to a thread size provided in the plurality of screw holes by the

respective radial inner threaded portion, wherein, optionally, the circumferential groove may have a depth which is in a range of 130%-200% of a core hole diameter (e.g. a core hole diameter according to DIN ISO 1502:1996-12) corresponding to a thread size provided in the plurality of screw holes by the respective radial inner threaded portion.

The radially tapering structure may comprise at least one of the lateral groove walls (e.g. one lateral groove wall, or both (of the) lateral groove walls) being inclined, with a corresponding tool-supporter-body-sided inclination (e.g. an inclination assigned to the tool supporter body) , in a manner so that, along a radially inward direction relative to the tool-supporter-rotation-axis, it approaches the respective other lateral groove wall (e.g. so that, in case of both lateral groove walls being inclined, along a radially inward direction relative to the tool-supporter-rotation-axis, both lateral groove walls approach each other) .

The radially tapering structure may comprise the radial outer sliding portion of a respective screw hole having a conical shape so as to taper, with a corresponding tool-supporter-body-sided inclination (e.g. an inclination assigned to the tool supporter body) , in a radially inward direction relative to the tool-supporter-rotation-axis.

In addition or as an alternative to the above described radially tapering structures, the radially tapering structure may comprise the trailing screw head of a respective

adjustment screw having a conical shape so as to taper, with a corresponding screw-head-sided inclination (e.g. an

inclination assigned to the screw head) , in the direction from its trailing screw head toward its leading threaded portion.

The corresponding tool-supporter-body-sided inclination may correspond to (e.g. may match, e.g. may be adapted so as to match/to fit to) the corresponding screw-head-sided

inclination .

The plurality of screw holes may comprise three or more screw holes, and the plurality of adjustment screws may

comprise three or more adjustment screws. The plurality of screw holes may comprise four screw holes, and the plurality of adjustment screws may comprise four adjustment screws.

The tool supporter may further comprise a cover ring (e.g. a lock cap) adapted to be attached to the tool supporter so as to cover the screw holes and the adjustment screws inserted into the screw holes. The cover ring may comprise an inner thread on an inner circumferential surface thereof so that it can be screwed onto an outer thread formed on the tool

supporter body.

The cover ring may comprise a unique mounting tool engagement structure which, e.g., is not in line with any tool norm so that the cover ring can only be installed/de-installed by using a corresponding unique mounting tool mating the said mounting tool engagement structure.

The installation of the cover ring may help preventing unauthorized persons to manipulate an adjusting system.

The tool supporter as described in this application may be provided in combination with a separate tool, wherein the separate tool is fixedly attachable/attached to the tool holder in a releasable manner.

Alternatively, the tool supporter as described in this application may be provided in combination with a (integral) tool, wherein the tool is integrally formed with the tool interface in one piece.

The invention further provides a method for aligning a tool supported by a tool supporter as described above, the method comprising the step of: reducing a runout of the tool with respect to the tool-supporter-rotation-axis by adjusting at least one of the adjustment screws of the plurality of adjustment screws with respect to the respective screw hole of the plurality of screw holes.

The method may comprise one or more of the steps of: pre tightening the plurality of adjustment screws with a

predetermined torque in a crosswise sequence, rotating 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 the tool by 180° from the determined rotational position of the highest runout of the tool and determining (e.g. , at a/the free end of the tool, ) the runout at this rotational position, rotating the tool back to the rotational position of the highest runout and adjusting the adjustment screw 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 (so that the total runout in the direction defined by these rotational positions is minimized), rotating the tool by 90° and determining (e.g. , at a/the free end of the tool,) the runout at this rotational position, rotating the tool by 180° and determining (e.g. , at a/the free end of the tool,) the runout at this rotational position and adjusting the adjustment screw closest to this rotational position or the adjustment screw 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 (so that the total runout in the direction defined by these rotational positions is minimized) .

The step of determining the runout may respectively comprise the step of measuring the elevation in the radial direction of the tool with respect to a fixed external point.

The tool may comprise a plurality of cutting edges formed on an outer surface thereof in a manner so as to be

circumferentially spaced from each other, wherein the tool may be supported by the tool interface such that at least one of the plurality of the cutting edges is aligned to one of the plurality of adjustment screws.

The number of screw holes as well as the number of adjustment screws may correspond to the number of cutting edges. The number of screw holes may be four, while the number of adjustment screws is also four.

Brief Description of the Drawings

In the following, the invention will be described by means of embodiments with reference to the figures. In the figures:

Fig. 1 is a front view of a tool supporter according to one embodiment of the present invention without a cover ring being attached,

Fig. 2 is a front view of the tool supporter of Fig. 1 with a cover ring being attached,

Fig. 3 is a sectional view of the tool supporter of Fig. 1,

Fig. 4 is an enlarged view of the adjusting system of Fig. 3,

Fig. 5 is a front view of the tool supporter of Fig. 1 without the cover ring being attached, wherein internal elements of the tool supporter are shown in dashed lines,

Fig. 6 is a sectional view of the tool supporter along line A-A of Fig. 5,

Fig. 7 is an enlarged view of the region X of Fig. 6,

Fig. 8 is a sectional view of the tool supporter, showing the forces resulting from one adjustment screw being tightened,

Fig . 9 is a sectional view of the tool supporter, showing the forces resulting from another adjustment screw being tightened,

Fig. 10 is a sectional view of a cover ring,

Fig. 11 is a front view of another embodiment of the tool supporter,

Fig. 12 is a sectional view illustrating another

embodiment of a tapering structure,

Fig. 13 is a sectional view illustrating another further embodiment of a tapering structure,

Fig. 14 is a sectional view illustrating yet another further embodiment of a tapering structure, and

Fig. 15 is a flowchart illustrating a method for

aligning a tool using a tool supporter as described in this application .

Throughout the figures, same reference signs are used for same structural parts.

Detailed Description of the Invention

According to figures 1 to 10, a tool supporter 10 for supporting a tool has a tool supporter body 20 which defines a longitudinal tool-supporter-rotation-axis 30 and which

comprises: a machine interface 40, which is configured to be connected to a rotary driving machine in a torque-transmitting manner, a tool interface 50, which is fixed to the machine interface 40 and which is configured to support a tool, and an adjusting system (e.g. adjusting mechanism) 60, which is arranged, along the tool-supporter-rotation-axis 30, between the machine interface 40 and the tool interface 50. The adjusting system 60 comprises: an outer circumferential groove 70 which is formed in the tool supporter body 20 and which extends all around the tool-supporter-rotation-axis 30, wherein the outer circumferential groove 70 comprises two lateral groove walls 75 and 76 opposite to each other, a plurality of screw holes 80, which are arranged along the circumferential groove 70 in a manner to be circumferentially and equally 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, which are to be inserted into the screw holes 80.

Each screw hole 80 comprises a radial inner threaded portion 100 and a radial outer sliding portion 110. 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.

The 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 and 76 via the radially tapering structure 140 of the respective slide engagement 135 to cause a local (that is, in the location area of the respective adjustment screw 90) 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 147 (one tilt axis 147 is exemplarily shown in Fig. 8) transverse to the tool-supporter-rotation-axis 30.

The tool supporter 10 of the embodiment of Figs. 1 to 10 is formed as a tool holder 150, wherein the tool interface 50 is configured to fixedly attach a separate tool (e.g. a machining tool, such as a drill or a reamer) (not shown) to the tool holder 150 in a releasable manner. The tool holder 150 may be formed as shrink-fit tool holder, wherein the tool interface 50 is configured to fixedly attach the separate tool (not shown) to the shrink-fit tool holder via thermal

shrinking in a releasable manner.

As shown in Figs. 1 and 6, the circumferential groove 70 has a depth D which is about 30% of the radius R of the tool supporter body 20 at the axial level (seen along the tool-supporter-rotation-axis 30) of the circumferential groove 70.

As shown in Fig. 6, the circumferential groove 70 has a depth D which is about 160% of a core hole diameter CD (e.g. a core hole diameter CD according to DIN ISO 1502:1996-12) corresponding to a thread size provided in the plurality of screw holes 80 by the respective radial inner threaded portion 110.

The radially tapering structure 140 comprises the radial outer sliding portion 100 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. The radially tapering structure 140 further 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. The corresponding tool-supporter-body-sided inclination 160 corresponds to the corresponding screw-head-sided inclination 170. In other words, the conical shape of the radial outer sliding portion 100 of the respective screw hole 80 matches the conical shape of the trailing screw head 130 of the respective adjustment screw 90.

The plurality of screw holes 80 comprises four screw holes 70, and the plurality of adjustment screws 90 comprises four adjustment screws 90.

The tool supporter 10 further comprises a cover ring (e.g. a lock cap) 180 adapted to be attachable to the tool supporter 10 so as to cover the screw holes 80 and the adjustment screws 90 inserted into the screw holes 80. The cover ring 180

comprises an inner thread 185 on an inner circumferential surface 190 thereof, and the tool supporter body 20 comprises, on an outer surface thereof, at the axial level (seen along the tool-supporter-rotation-axis 30) of the adjusting system 60, an outer thread 195, whereby the cover ring 180 can be screwed onto the tool supporter body 20. The cover ring 180 is adapted in a manner so as to be attachable/detachable to the tool supporter 10/tool supporter body 20 only with a unique tool (not shown) which, e.g., does not match a tool norm.

E.g., in Fig. 1, the cover ring 180 is not attached to the tool supporter 10/tool supporter body 20, and, e.g., in

Fig. 2, the cover ring 180 is attached to the tool supporter 10/tool supporter body 20 and, thereby, covers the screw holes 80 and the adjustment screws 90 inserted into the screw holes 80.

As shown in Fig. 8, tightening one of the adjustment screws 90 results in its trailing screw head 130 to apply a spreading force 145 via both lateral groove walls 75 and 76 to both, the machine interface 40 and the tool interface 50.

Thereby, a tilting 200 of the tool interface 50 relative to the machine interface 40 in the direction of the tightening of the respective adjustment screw 90 is caused. As shown in Fig. 9, tightening the opposite adjustment screw 90 results in a tilting in the opposite direction 200.

In the following, a tool supporter 10 according to another embodiment is described based on Fig. 11. The embodiment of Fig. 11 generally comprises the features of the embodiments of Figs. 1-10, so that, in the following merely the differences between these embodiments are described.

In the embodiment shown in Fig. 11, the tool interface 50 is integrally formed with a tool 250 (which, like the tool of the embodiment of Figs. 1-10, may, e.g., be a machining tool, such as a drill or a reamer) in one piece.

In the following, a tool supporter 10 according to another embodiment is described based on Fig. 12. The embodiment of Fig. 12 generally comprises the features of the embodiments of Figs. 1-11, so that, in the following merely the differences between these embodiments are described.

In the embodiment shown in Fig. 12, the radially tapering structure 140 comprises the one 75 of the lateral groove walls 75 and 76, which is proximal to the tool interface 50, 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 other one 76 of the lateral groove walls 75 and 76, which is distal to the tool interface 50. The adjustment screw 90 comprises a cylindrically shaped, trailing screw head 130 to engage the radial outer sliding portion 110 of the corresponding screw hole 80 to form a respective slide

engagement 135.

In the following, a tool supporter 10 according to another embodiment is described based on Fig. 13. The embodiment of Fig. 13 generally comprises the features of the embodiment of Fig. 12, so that, in the following merely the differences between these embodiments are described.

In the embodiment shown in Fig. 13, the radially tapering structure 140 comprises both, the one 75 of the lateral groove walls 75 and 76, which is proximal to the tool interface 50, and the other one 76 of the lateral groove walls 75 and 76, which is distal to the tool interface 50, 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, they approach each other .

In the following, a tool supporter 10 according to another embodiment is described based on Fig. 14. The embodiment of Fig. 14 generally comprises the features of the embodiment of Fig. 13, so that, in the following merely the differences between these embodiments are described.

In the embodiment shown in Fig. 14, the radially tapering structure 140 further 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. The corresponding tool-supporter-body-sided inclination 160 corresponds to the corresponding screw-head-sided inclination 170. In other words, the shape of the radial outer sliding portion 100

(i.e., the respective tool-supporter-body-sided inclination 160, ) of the respective screw hole 80 matches the conical shape of the trailing screw head 130 of the respective

adjustment screw 90 (i.e., the respective screw-head-sided inclination 170, ) . Therefore, the trailing screw head 130 is configured to slidably engage the radial outer sliding portion 110 of the corresponding screw hole 80 to form a respective slide engagement 135.

As shown in Fig. 15, a tool supporter 10 according to the embodiments described above may be used for aligning a tool supported by the tool supporter 10, e.g. a tool 250 integrally formed with the tool supporter 10 or a separate tool fixedly attached to the tool holder 150 in a releasable manner, wherein the method comprises: 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.

The method may further comprise the following steps: 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 (e.g. , at a/the free end of the tool, ) 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 (e.g. , at a/the free end of the tool,) the runout at this rotational position, rotating S70 the tool by 180° and determining (e.g. , at a/the free end of the tool, ) 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 .

The step of determining the runout may respectively comprise the step of measuring the elevation in the radial direction of the tool with respect to a fixed external point.

The tool may comprise a plurality of cutting edges formed on an outer surface thereof in a manner so as to be

circumferentially spaced from each other. The tool may be supported by the tool interface such that at least one of the plurality of the cutting edges is aligned to one of the plurality of adjustment screws 90.

The number of screw holes 80 as well as the number of adjustment screws 90 may correspond to the number of cutting edges. The number of screw holes 80 may be four, while the number of adjustment screws 90 is also four.

List of Reference Signs

10: tool supporter

20: tool supporter body

30: longitudinal tool-supporter-rotation-axis

40: machine interface

50: tool interface

60: adjusting system

70: outer circumferential groove

75: lateral groove wall (proximal to tool interface 50)

76: lateral groove wall (distal to tool interface 50)

80 : screw hole

90: adjustment screw

100: radial inner threaded portion

110: radial outer sliding portion

120: leading threaded portion

130: trailing screw head

135: slide engagement

140: radially tapering structure

145: lateral spreading force

147 : tilt axis

150: tool holder

160: tool-supporter-body-sided inclination

170: screw-head-sided inclination

180: cover ring

185: inner thread

190: inner circumferential surface

195: outer thread

200: tilting

250: tool

D: depth (of the circumferential groove 70)

R: radius (of the tool supporter body 20)

CD: core hole diameter