CA1141201A - Drilling tool - Google Patents
Drilling toolInfo
- Publication number
- CA1141201A CA1141201A CA000365329A CA365329A CA1141201A CA 1141201 A CA1141201 A CA 1141201A CA 000365329 A CA000365329 A CA 000365329A CA 365329 A CA365329 A CA 365329A CA 1141201 A CA1141201 A CA 1141201A
- Authority
- CA
- Canada
- Prior art keywords
- tool
- drilling
- support
- spindle
- tightening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Earth Drilling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A drilling tool (8) is exchangeably mounted in a tool spindle (1) of a drilling unit. The drilling tool (8) is supported by a tool support (6) tiltable about an axis per-pendicular to the axis of the spindle. The tool support (6) is connected with a supporting arm (10) resting on a slightly divergent wedging surface (12) of an adjustment member (13) which is axially shiftable in the tool spindle (1) by means of a connecting rod (15). The wedging surface is slightly divergent with respect to the axis of the spindle, at about 1°.
Axial shifting of the connecting rod (15), results in radial displacement of the drilling tool (8). The drilling tool (8) is capable of being tightened in the tool support (6) by a setbolt tightening arrangement (18, 19, 20) utilizing balls mounted in an axially shiftable tightening cage (18). At the end of the axial movement of the connecting rod (15), the con-necting rod shifts the tightening cage (18) against its resiliently maintained tight position and thus releases the setbolt tightening of the drilling tool (8). The device pro-vides a lesser space requirement and simpler structure and can be conveniently arranged within the tool spindle, avoiding the need of tool carrying means normally mounted at the front face of the tool support.
A drilling tool (8) is exchangeably mounted in a tool spindle (1) of a drilling unit. The drilling tool (8) is supported by a tool support (6) tiltable about an axis per-pendicular to the axis of the spindle. The tool support (6) is connected with a supporting arm (10) resting on a slightly divergent wedging surface (12) of an adjustment member (13) which is axially shiftable in the tool spindle (1) by means of a connecting rod (15). The wedging surface is slightly divergent with respect to the axis of the spindle, at about 1°.
Axial shifting of the connecting rod (15), results in radial displacement of the drilling tool (8). The drilling tool (8) is capable of being tightened in the tool support (6) by a setbolt tightening arrangement (18, 19, 20) utilizing balls mounted in an axially shiftable tightening cage (18). At the end of the axial movement of the connecting rod (15), the con-necting rod shifts the tightening cage (18) against its resiliently maintained tight position and thus releases the setbolt tightening of the drilling tool (8). The device pro-vides a lesser space requirement and simpler structure and can be conveniently arranged within the tool spindle, avoiding the need of tool carrying means normally mounted at the front face of the tool support.
Description
ZIVl A DRILLING UNIT
Background of the invention The invention relates to a drilling unit with a rotat-ably driven bored tool spindle for exchangeably receiving a drilling tool in a tool support, the support being slightly tiltable about an axis perpendicular to the axis of the tool spindle. The support is reinforced by a support arm resting on a slightly inclined wedge surface of an adjustment member axially shiftable in the tool spindle by means of a connecting rod.
In a known drilling unit of the type (DE-OS 2,040,020), the drilling tool is screwed and centered on the face of the tool support which simultaneously serves as a tool mounting means. For an exchange, the drilling tool must be unscrewed from the tool support. A faster or even fully automatic tool exchange is not possible with same.
In the known fully automatic tool exchange devices, the tool is provided with a tapered sleeve which is tightened in a conical mounting bore of a setbolt forming an extension of the tapered sleeve. A set of balls movable, with a tighten-ing cage, axially along an inclined surface located in thespindle bore, pulls the setbolt inwardly when the tightening cage is pulled rearwards by the action of a tension spring.
In order to release this tightening of the setbolt, the tightening cage is shifted forwards by means of a connecting rod disposed in the bored spindle, until the balls release the setbolt.
`'``;~
~41;~0~
In the known setbolt tightening, it is necessary to pro-vide space in the spindle bore for the elements of the setbolt tightening mechanism; in the known drilling unit referred to at the outset, the spindle bore for receiving the support arm, the axially slidable adjustment member and the connecting rod integral with the member are all necessary to provide for the desired tilting motion of the drilling tool. Furthermore, in the known arrangement, only the face of the tool support is available for exchangeably mounting the drilling tool on the tool support.
Summary of the Invention Thus, it is an object of the invention to provide a drilling unit of the type mentioned at the outset wherein a fully automatic tool exchange can be effected without impair-lS ing the tilting motion of the drilling tool or necessitatingan engagement at the forward end of the spindle for loosening or tightening,that is, for mounting the tool.
In general, the invention combines an arrangement where-in the drilling tool is arranged for tightening in the tool support by means of a setbolt pull utilizing a set of balls, disposed in a cage and movable along an inclined surface, as the cage is shifted axially in a bore provided in the support-ing arm. At the end of its axial stroke tilting the adjusting member and the tool support, the connecting rod is arranged to enter into engagement, over stop shoulder, with the tightening cage which is otherwise maintained in its tightened position byCmpression springs. Thus, the engagement of the rod with the shoulder results in axial shift of the cage releasing the setbolt.
The integers of the setbolt tightening mechanism are thus accommodated within the interior of the supporting arm. For actuating the setbolt tightening, the connecting rod is so arranged that it axially shifts the adjustment member provided with the wedging surface or surfaces. At the end of its adjustment stroke, the connecting rod can be brought into engagemerlt with the tightening cage of the setbolt tightening, in order to loosen the setbolt tightening. When such engage-ment is again released, the setbolt returns back to itstightened state. In this way, a fully automatic tool exchange can be achieved even in a drilling unit with a sidewise or radially tiltable drilling tool for radial adjustment of the cutting edge, whereby a separate actuating device for the release of the tool is not necessary. No complex and cumber-some engagement at the forward face of the spindle is required for the purpose of mounting the drilling tool. At the forward spindle end is now inserted only the exchangeable drilling tool.
Due to the very small space requirement of the parts re-quired for the tool tightening according to the invention, it is further conveniently possible in a structurally very simple way to provide in the connecting rod and in further parts attached to the drilling tool a central coolant conduit.
Brief Description of the Drawing Further features and advantages of the invention will become apparent from the following description of an exemplary embodiment with reference to the accompanying drawing showing a partial longitudinal section of a drilling unit.
Detailed Description of a Preferred Embodiment A bored tool spindle 1 is rotatably mounted in a housing 3 by spindle bearings 2. A rotary drive engaged at the rear end of the tool spindle 1 is not shown in the drawing.
At the forward end of the spindle is flanged a support ring 4 connected with a tool support 6 by means of two mutually opposite torsion springs 5 (in the drawing displaced by 90 within the plane of the drawing). The support 6 is provided with a conical tool mounting bore 7. In the tool mounting bore 7 is seated a tapered sleeve 9 connected with a drilling tool 8. The tool support 6 is integral with a sup-port arm 10 which rests by its slide members 11 on two mutually opposite wedge surfaces 12, 12', also referred to as camming surfaces.
The surfaces 12, 12' are generally linear and are slightly inclined with respect to the longitudinal axis of the ~141~
spindle, in the shown embodiment at an angle of 1. They are included in an axially shiftable fork-shaped adjustment member 13. The adjustment member 13 is provided with a tubular ex-tension 14 connected with a tubular connecting rod 15 passing through the spindle 1 and out of the rear end for connection to an adjustment device 16 which is shown only in a diagram-matic way in the drawing. The connecting rod 15 can be positioned by the device 16 at different exactly predetermined positions.
The axial shifting of the adjustment member 13 serves the purpose of tilting the tool support 6 about the torsion ; springs 5,(i.e. about an axis perpendicular to the plane of the drawing) to provide a radial displacement of the cutting tip of the drilling tool 8, for instance as follows:
- 15 When the adjustment member 13ismoved backwards from its starting position shown in the drawing, i.e. to the right of -^ the drawing, the tool support 6 tilts about the torsion spring ` 5 counterclockwise so that the cutting tip of the drilling tool 8 is brought into the radially outward position required for the drilling process. When the drilling process is finished, the adjustment member 13 is shifted back to the starting position shown in the drawing, whereby the cutting tip of the drilling tool 8 is retracted radially inwardly, away from the machined surface ready for withdrawing of the tool out of the machined bore.
Alternatively, the drilling tool 8 can also be so arranged that in the position shown in the drawing it drills - into the full material thus performing the rough machining of the bore. At the end of this working process, the tool support 6 is tilted by rearwards pull on the adjustment mem-ber 13, whereby the cutting tip of the drilling tool is placed to its radially outward position. In the latter position a fine machining of the bore can be effected on the reversed axial motion of the rotating tool.
The described tilting of the tool support 6 with the drilling tool 8 usually follows at the end of the machining of each bore, i.e. often in several sequences one after the ll~lZOl other, without an exchange of the drilling tool at the end of one complete machining cycle. The axial positioning of the adjustment member 13 can also be predetermined such as to provide merely a slight radial adjustment of the cutting edge of the drilling tool to compensate for the wear of the edge and thus to maintain a close tolerance of the drilled bore.
In a bore 17 of the support arm 10 is axially shiftable a tightening cage 18 which houses an annular row of tightening balls 19 which, in the tightened position shown in the drawing, hold a setbolt 20 integral with the rear end of the tapered sleeve 9. On axial movement of the tightening cage 18 forwards, the balls 19 move along an annular beveled or inclined surface 21 and can reach so far radially outwardly that, eventually they become disengaged from the setbolt 20.
The cage 18 is fixedly connected with an axial tie rod 22 haying at its rear end an annular snoulder 23 on which rests one end of compression spring means of the type of a plate spring set 24, the other end of which engages the rear axial end of the support arm 10. Thus, the shoulder abutment 23 forms part which is integral with the cage 18 and thus presents an em-bodiment of what can be generally referred to as "a part of the tightening cage means." The spring set 24 pulls the tie rod 22 (and therewith the tightening cage 18, the balls 19 and the setbolt 20) rearwards and thus firmly holds the tapered sleeve 9 within the conical mounting bore 7.
When the drilling tool 8 is to be exchanged or replaced, for instance due to the excessive wear of the tool after the machining of a number of boresor when a different drilling tool becomes due for application, the connecting rod 15 is shifted forwards over its position shown in the drawing (i.e.
to the left of the drawing). The connecting rod 15 now enters at its face 15' into engagement with a rear stop or abutment surface 23' of the abutment 23 thus shifting the tie rod 22 against the force of the spring 24 forwardly to release the setbolt 20.
- The wedge surface 12 merges at its rear end into an axially parallel surface 12". At the point at which the 1141Z~
surfaces 15', 23' enter into mutual engagement, the upper slide member 11 of the support arm 10 is disposed in the region of the parallel surface 12". Further axial movement of the connecting rod 15 ~orwards therefore does not result in further tllt of the supporting arm 11 of the drilling tool 8.
Such further axial movement of the connectlng rod 15 merely serves the purpose of shifting the tightening cage 18 to the left for release of the setbolt 20, so that the drilling tool 8 with its tapered sleeve 9 and with the setbolt 20 can be gripped by a tool exchange device on a flange 9' and exchanged, the tool exchange device per se being well known and therefore not being shown in the drawing.
The tool exchange takes place on standstill with the tool spindle 1 at a predetermined angular location wherein the drilling tool can be inserted always at the same position of : its cutting edge relative to the wedge surfaces 12, 12' and to the torsion springs 5. At the face of the tool spindle 1 is provided a carrier block 25 engaging a recess 26 on the flange 9'.
The connecting rod 15 contains, in a bore 27, a coolant conducting pipe 28 connected at a telescopic coupling 29 with the bored tie rod 22. Through a further telescopic coupling 30, the tie rod 22 is connected with the setbolt 20, which~similarly to the tapered sleeve 9 and to the drilling tool 8, is provided with a central longitudinal bore. In this way, a continuous coolant conduit is formed which extends up to the drilling tool.
.~ Those skilled in the art will readily appreciate that the embodiment shown in the drawing can be modified without departing from the scope of the present invention as set forth in the accompanying claims.
Background of the invention The invention relates to a drilling unit with a rotat-ably driven bored tool spindle for exchangeably receiving a drilling tool in a tool support, the support being slightly tiltable about an axis perpendicular to the axis of the tool spindle. The support is reinforced by a support arm resting on a slightly inclined wedge surface of an adjustment member axially shiftable in the tool spindle by means of a connecting rod.
In a known drilling unit of the type (DE-OS 2,040,020), the drilling tool is screwed and centered on the face of the tool support which simultaneously serves as a tool mounting means. For an exchange, the drilling tool must be unscrewed from the tool support. A faster or even fully automatic tool exchange is not possible with same.
In the known fully automatic tool exchange devices, the tool is provided with a tapered sleeve which is tightened in a conical mounting bore of a setbolt forming an extension of the tapered sleeve. A set of balls movable, with a tighten-ing cage, axially along an inclined surface located in thespindle bore, pulls the setbolt inwardly when the tightening cage is pulled rearwards by the action of a tension spring.
In order to release this tightening of the setbolt, the tightening cage is shifted forwards by means of a connecting rod disposed in the bored spindle, until the balls release the setbolt.
`'``;~
~41;~0~
In the known setbolt tightening, it is necessary to pro-vide space in the spindle bore for the elements of the setbolt tightening mechanism; in the known drilling unit referred to at the outset, the spindle bore for receiving the support arm, the axially slidable adjustment member and the connecting rod integral with the member are all necessary to provide for the desired tilting motion of the drilling tool. Furthermore, in the known arrangement, only the face of the tool support is available for exchangeably mounting the drilling tool on the tool support.
Summary of the Invention Thus, it is an object of the invention to provide a drilling unit of the type mentioned at the outset wherein a fully automatic tool exchange can be effected without impair-lS ing the tilting motion of the drilling tool or necessitatingan engagement at the forward end of the spindle for loosening or tightening,that is, for mounting the tool.
In general, the invention combines an arrangement where-in the drilling tool is arranged for tightening in the tool support by means of a setbolt pull utilizing a set of balls, disposed in a cage and movable along an inclined surface, as the cage is shifted axially in a bore provided in the support-ing arm. At the end of its axial stroke tilting the adjusting member and the tool support, the connecting rod is arranged to enter into engagement, over stop shoulder, with the tightening cage which is otherwise maintained in its tightened position byCmpression springs. Thus, the engagement of the rod with the shoulder results in axial shift of the cage releasing the setbolt.
The integers of the setbolt tightening mechanism are thus accommodated within the interior of the supporting arm. For actuating the setbolt tightening, the connecting rod is so arranged that it axially shifts the adjustment member provided with the wedging surface or surfaces. At the end of its adjustment stroke, the connecting rod can be brought into engagemerlt with the tightening cage of the setbolt tightening, in order to loosen the setbolt tightening. When such engage-ment is again released, the setbolt returns back to itstightened state. In this way, a fully automatic tool exchange can be achieved even in a drilling unit with a sidewise or radially tiltable drilling tool for radial adjustment of the cutting edge, whereby a separate actuating device for the release of the tool is not necessary. No complex and cumber-some engagement at the forward face of the spindle is required for the purpose of mounting the drilling tool. At the forward spindle end is now inserted only the exchangeable drilling tool.
Due to the very small space requirement of the parts re-quired for the tool tightening according to the invention, it is further conveniently possible in a structurally very simple way to provide in the connecting rod and in further parts attached to the drilling tool a central coolant conduit.
Brief Description of the Drawing Further features and advantages of the invention will become apparent from the following description of an exemplary embodiment with reference to the accompanying drawing showing a partial longitudinal section of a drilling unit.
Detailed Description of a Preferred Embodiment A bored tool spindle 1 is rotatably mounted in a housing 3 by spindle bearings 2. A rotary drive engaged at the rear end of the tool spindle 1 is not shown in the drawing.
At the forward end of the spindle is flanged a support ring 4 connected with a tool support 6 by means of two mutually opposite torsion springs 5 (in the drawing displaced by 90 within the plane of the drawing). The support 6 is provided with a conical tool mounting bore 7. In the tool mounting bore 7 is seated a tapered sleeve 9 connected with a drilling tool 8. The tool support 6 is integral with a sup-port arm 10 which rests by its slide members 11 on two mutually opposite wedge surfaces 12, 12', also referred to as camming surfaces.
The surfaces 12, 12' are generally linear and are slightly inclined with respect to the longitudinal axis of the ~141~
spindle, in the shown embodiment at an angle of 1. They are included in an axially shiftable fork-shaped adjustment member 13. The adjustment member 13 is provided with a tubular ex-tension 14 connected with a tubular connecting rod 15 passing through the spindle 1 and out of the rear end for connection to an adjustment device 16 which is shown only in a diagram-matic way in the drawing. The connecting rod 15 can be positioned by the device 16 at different exactly predetermined positions.
The axial shifting of the adjustment member 13 serves the purpose of tilting the tool support 6 about the torsion ; springs 5,(i.e. about an axis perpendicular to the plane of the drawing) to provide a radial displacement of the cutting tip of the drilling tool 8, for instance as follows:
- 15 When the adjustment member 13ismoved backwards from its starting position shown in the drawing, i.e. to the right of -^ the drawing, the tool support 6 tilts about the torsion spring ` 5 counterclockwise so that the cutting tip of the drilling tool 8 is brought into the radially outward position required for the drilling process. When the drilling process is finished, the adjustment member 13 is shifted back to the starting position shown in the drawing, whereby the cutting tip of the drilling tool 8 is retracted radially inwardly, away from the machined surface ready for withdrawing of the tool out of the machined bore.
Alternatively, the drilling tool 8 can also be so arranged that in the position shown in the drawing it drills - into the full material thus performing the rough machining of the bore. At the end of this working process, the tool support 6 is tilted by rearwards pull on the adjustment mem-ber 13, whereby the cutting tip of the drilling tool is placed to its radially outward position. In the latter position a fine machining of the bore can be effected on the reversed axial motion of the rotating tool.
The described tilting of the tool support 6 with the drilling tool 8 usually follows at the end of the machining of each bore, i.e. often in several sequences one after the ll~lZOl other, without an exchange of the drilling tool at the end of one complete machining cycle. The axial positioning of the adjustment member 13 can also be predetermined such as to provide merely a slight radial adjustment of the cutting edge of the drilling tool to compensate for the wear of the edge and thus to maintain a close tolerance of the drilled bore.
In a bore 17 of the support arm 10 is axially shiftable a tightening cage 18 which houses an annular row of tightening balls 19 which, in the tightened position shown in the drawing, hold a setbolt 20 integral with the rear end of the tapered sleeve 9. On axial movement of the tightening cage 18 forwards, the balls 19 move along an annular beveled or inclined surface 21 and can reach so far radially outwardly that, eventually they become disengaged from the setbolt 20.
The cage 18 is fixedly connected with an axial tie rod 22 haying at its rear end an annular snoulder 23 on which rests one end of compression spring means of the type of a plate spring set 24, the other end of which engages the rear axial end of the support arm 10. Thus, the shoulder abutment 23 forms part which is integral with the cage 18 and thus presents an em-bodiment of what can be generally referred to as "a part of the tightening cage means." The spring set 24 pulls the tie rod 22 (and therewith the tightening cage 18, the balls 19 and the setbolt 20) rearwards and thus firmly holds the tapered sleeve 9 within the conical mounting bore 7.
When the drilling tool 8 is to be exchanged or replaced, for instance due to the excessive wear of the tool after the machining of a number of boresor when a different drilling tool becomes due for application, the connecting rod 15 is shifted forwards over its position shown in the drawing (i.e.
to the left of the drawing). The connecting rod 15 now enters at its face 15' into engagement with a rear stop or abutment surface 23' of the abutment 23 thus shifting the tie rod 22 against the force of the spring 24 forwardly to release the setbolt 20.
- The wedge surface 12 merges at its rear end into an axially parallel surface 12". At the point at which the 1141Z~
surfaces 15', 23' enter into mutual engagement, the upper slide member 11 of the support arm 10 is disposed in the region of the parallel surface 12". Further axial movement of the connecting rod 15 ~orwards therefore does not result in further tllt of the supporting arm 11 of the drilling tool 8.
Such further axial movement of the connectlng rod 15 merely serves the purpose of shifting the tightening cage 18 to the left for release of the setbolt 20, so that the drilling tool 8 with its tapered sleeve 9 and with the setbolt 20 can be gripped by a tool exchange device on a flange 9' and exchanged, the tool exchange device per se being well known and therefore not being shown in the drawing.
The tool exchange takes place on standstill with the tool spindle 1 at a predetermined angular location wherein the drilling tool can be inserted always at the same position of : its cutting edge relative to the wedge surfaces 12, 12' and to the torsion springs 5. At the face of the tool spindle 1 is provided a carrier block 25 engaging a recess 26 on the flange 9'.
The connecting rod 15 contains, in a bore 27, a coolant conducting pipe 28 connected at a telescopic coupling 29 with the bored tie rod 22. Through a further telescopic coupling 30, the tie rod 22 is connected with the setbolt 20, which~similarly to the tapered sleeve 9 and to the drilling tool 8, is provided with a central longitudinal bore. In this way, a continuous coolant conduit is formed which extends up to the drilling tool.
.~ Those skilled in the art will readily appreciate that the embodiment shown in the drawing can be modified without departing from the scope of the present invention as set forth in the accompanying claims.
Claims (7)
1. A drilling unit with a rotary, bored tool spindle for exchangeable mounting of a drilling tool in a tool support of said spindle, the support being tiltable about an axis generally perpendicular to the axis of the tool spindle, the support including a support arm extending axially away from the support and engaging a generally linear, slightly inclined camming surface of an adjustment member axially shiftable within the spindle by a connecting rod, wherein the drilling tool is arranged for becoming tightened in the tool support by setbolt tightening means including a set of tightening balls arranged in and movable by a tightening cage means axially shiftable in a bore of the supporting arm along a beveled surface, the connecting rod being so arranged that at the end of its axial stroke shifting the adjustment member to tilt the tool support, a portion of the connecting rod engages a part of the tightening cage means resiliently held in its tightened position and axially shifts same for release of the setbolt.
2. A drilling unit according to claim 1, wherein the tightening cage means includes a cage with a generally integral axial tie rod on which is arranged a compression spring whose one end engages the support arm, the other end of the spring engaging a spring abutment generally integral with the tie rod, which spring abutment simultaneously forms engagement means for the connecting rod.
3. A drilling unit according to claim 1, wherein the in-clination of the camming surface is so directed that the drilling tool is moved radially inwardly on an axial motion of the adjustment member directed towards the tool.
4 . A drilling unit according to claim 1, wherein the cam-ming surface merges at an axial end thereof adjacent to the support arm, into an axially parallel surface.
5. A drilling unit according to claim 4, wherein the supporting arm engages two mutually opposite, parallel camming surfaces of the adjustment member and wherein the axially parallel surface is provided as a continuation of one of the two camming surfaces.
6. A drilling unit according to claim 1, wherein the tie rod, the setbolt and the drilling tool are all bored to provide an axial passage for a coolant.
7. A drilling unit according to claim 6, wherein said passage includes a conduit comprised of coolant pipes arranged in the connecting rod and in the tie rod, respectively, said passage further including a telescopic conduit coupling means allowing relative axial displacement of portions of the conduit while maintaining same in communication for passage of the coolant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000365329A CA1141201A (en) | 1980-11-24 | 1980-11-24 | Drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000365329A CA1141201A (en) | 1980-11-24 | 1980-11-24 | Drilling tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141201A true CA1141201A (en) | 1983-02-15 |
Family
ID=4118534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000365329A Expired CA1141201A (en) | 1980-11-24 | 1980-11-24 | Drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1141201A (en) |
-
1980
- 1980-11-24 CA CA000365329A patent/CA1141201A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |