DE202006020109U1 - Device for clamping a tool holder - Google Patents

Abstract

Device for clamping a tool holder in a receptacle of a turret of a cutting machine tool or machining center, wherein
the tool holder (1; 11; 12; 13), seen along its center axis (26), has a tool receiving receiving area (9; 9a; 9b; 9c) and a shank (3),
a common collar (2) is provided between the receiving region (9; 9a; 9b; 9c) and the shaft (3),
the collar (2) on the shaft side has a precision plane surface (2a) for engagement with an alignment surface of the revolver,
the shaft (3) can be inserted into the receptacle of the tool turret and can be releasably locked in the same
For this purpose, the shaft (3) in its peripheral surface has an axially and the collar (2) directed towards recess (5), which opens near the Bund in a transverse undercut (6), wherein
this undercut (6) has a clamping surface (7) facing the planar surface (2a) of the collar (2),
arranged in the turret recording a lying transversely to the direction of insertion, preferably ...

Description

The The invention relates to a device according to the preamble of the claim 1 and is used to quickly clamp a tool holder in a receptacle a tool turret of a machine used e.g. a Turning or milling machine, a milling or turning center or a machining center - turning, milling, drilling, is.

Known are a variety of devices for clamping tool holders. In particular, serve radially acting pressure elements or locking pins for locking a clamping shaft of the tool holder in the relevant Receiving recess of the tool turret of the machine.

It are also known devices for quick clamping. A disadvantage these known solutions is their high production costs. In addition, the demands of Users of such devices regarding very accurate recording the tool holder, so a clamping with the smallest possible tolerances, permanent.

Therefore the object of the invention is to find a device a fast, secure and accurate clamping of the tool holder guaranteed in the recording and their production costs are low; also should be a fast Removal of the tool holder from the recording may be possible.

The The object of the invention is achieved by a device for clamping a Tool holder solved with the features of claim 1; the dependent claims 2 to 11 disclose developments and embodiments of the new device.

Of the Core idea of the invention comprises a special design of the in a receptacle of the turret insertable shaft of the tool holder along with design of the corresponding parts in the receptacle.

The new device for clamping a tool holder in a receptacle of a turret of a cutting machine tool or machining center, uses the from the DE 20 2005 020 586 U1 the same applicant known clamping principle and develops the same on.

Of the Tool holder has, as seen along its center axis, a a tool receiving receiving area and a shaft. Between the receiving area and the shaft a common collar is provided. The federal government has on the shaft side a precision flat surface, for attachment to a alignment of the revolver.

Of the Shank is inserted into the receptacle of the tool turret and in selbiger solvable lockable. For this purpose, the shaft has a circumferential surface axially and the collar directed towards recess near the Bund in a transverse undercut opens, with this undercut a to the plane surface the federal government facing clamping surface owns, and arranged in the revolver recording a transversely to Plug-in direction lying, preferably radially aligned clamping bolt is assigned such that when inserted shaft and the step "clamping" of the clamping bolt at the clamping surface attacks and the plane surface precise the alignment surface of the revolver used and locked at the same time. In special Design are now on the shaft several recesses, together with the undercut arranged and the recording in the revolver according to several clamping bolts assigned. After insertion of the shank of the tool holder into the in the tool turret provided recording is by pressing the clamping bolt the plane surface precise at the alignment surface used the tool turret and locked at the same time.

To an execution the clamping bolts are arranged in the form of clamping pins on a clamping ring. The clamping ring is in the end face of the Recording recorded in the same. In addition, the recording is a Actuator provided for movement of the clamping ring.

A special design is that each chuck on its the clamping surface of the Tool holder facing end face a guide surface, a sliding surface and a clamping surface having.

moreover is a preferred embodiment, that the actuating unit consists of at least one adjusting screw and a Rack is made, with the rack with a toothed section on the outside surface of the Clamping ring is in operative connection. Furthermore, it is preferable provided that the actuator is assigned a fuse, which the longitudinal movement limited to the rack and prevents twisting of the rack.

To another embodiment It is envisaged that the receptacle for the tool holder integral Part of the tool turret is.

A other design provides for recording for the tool holder is arranged in an adapter, which in a Hole of the turret can be accommodated and releasably locked.

A special design also provides that in the area of the undercut on the flat surface, a cam is provided to which the Revol ver stored clamping bolt abuts when it is actuated to release the lock, so that the flat surface is pushed away from the alignment surface of the revolver. The shank of the tool holder is thus moved away from the tool turret in the axial direction.

To another embodiment is at the periphery of the shaft at least one axially directed groove incorporated as part of a management unit whose other preferably leading Part preferably arranged in the shaft receiving receptacle is.

Prefers is also an execution, at the the clamping surface is provided on the shank of the tool holder on a clamping part, which is arranged in and on the recess, wherein the clamping part preferably replaceably mounted on the recess, so that For heavy use only this part and not the whole Tool holder must be replaced; So the tool costs can to be further minimized.

The Recording for the tool holder can, when arranged in the tool turret and also if arranged in the adapter, be fixed or rotatably mounted, depending on whether the tool to be included in the tool holder itself around its longitudinal axis should turn or not.

The advantages of the invention are in particular that with the new device, a fast, safe and accurate clamping of the tool holder can be done in the recording of the revolver. In addition, even in the reduction of the manufacturing cost of this device itself, including the reduction in the number of components. The new device also allows that from the DE 20 2005 020 586 U1 known clamping device of the same applicant for the clamping of tool holders with a shank diameter greater than 40 mm safely and accurately applicable.

The The invention will be described in more detail below with reference to exemplary embodiments explained in further details. The drawings show a schematic representation of several Types of tool holders and holders on which the new clamping system, the device is used. Showing:

1 a collet in perspective;

1a the collet after 1 with a view of the locking point on its shaft;

2 a milling mandrel in perspective;

2a the milling mandrel after 2 with a view of the locking point on its shaft;

3 a tapping tool in perspective;

3a the tapping tongs after 3 with a view of the locking point on its shaft;

4 a cylinder holder (tool holder) in side view;

5 . 5a , u. 5b a recordable in a turret adapter in which the receptacle for the tool holder is arranged

6a . 6b u. 6c one of the receptacle associated clamping bolt for locking the shank of the tool holder;

7a . 7b u. 7c a special version of the clamping bolt;

8th a longitudinal section through an adapter according to 5 , which is intended for receiving the special clamping bolt;

9a . 9b u. 9c different views of an adapter and

10a u. 10b Detailed views of the exciting elements of the in the

9a to 9c shown adapter.

In the 1 First of all, a tool holder intended to be accommodated in the new device is shown in perspective in the form of a collet. This tool holder 1 has along its center axis 26 a tool receiving receiving area 9 and a shaft 3 in a shot 14 of a said tool turret 15 , see in 4 , is pluggable. The recording area 9 is from the shaft 3 through a common covenant 2 separated, on the shank side a precision plane surface 2a , see also in 1a , for abutment with an alignment surface of the tool turret.

The shaft 3 has in its peripheral surface emanating from the machine-side end face axially and the collar 2 directed recess 5 , This recess 5 opens near the Bund in a transverse undercut 6 one, with this undercut 6 at the revolver side surface one to the plane surface 2a of the federal government 2 pointing towards clamping surface 7 has. At this clamping surface 7 engages transversely to the insertion in the receptacle 14 of the tool turret 15 arranged and substantially radially directed clamping bolt 20 at. Upon actuation of the clamping bolt 20 , ie the tensioning, becomes the plane surface 2a precisely on the alignment surface of the tool turret, more precisely on the end face of the receptacle 14 , used and locked at the same time. This is done in such a way that by drilling the clamping bolt 20 around its longitudinal axis, the outer surface with the clamping nose 24 of the clamping bolt on the clamping surface 7 attacks and the shaft 3 of the tool holder in the axial direction in the recording 14 pulls in until the plane surface 2a abuts the alignment surface.

In this in the 1 and 1a shown embodiment is in a special embodiment in the region of the undercut 6 , on the plane surface 2a a cam 8th is provided to the mounted in the turret clamping bolt 20 when actuated strikes to release and thus the plane surface 2a the collet 1 from the alignment surface 18 of the tool turret releases, ie the shaft 3 and thus the tool holder 1 moved away from the tool turret in the axial direction.

The clamping bolts 20 containing recording 14 and the clamping bolt 20 themselves are in the 5 to 6c shown.

In the in the 5 . 5a and 5b The embodiment shown is the recording 14 not directly in the tool turret 15 arranged but in an adapter 16 , which is held in the tool turret. At the housing 16a of the adapter 16 is a housing pin 16b arranged, which in said tool turret 15 which is not detailed here in detail and in 4 is indicated by a dash-dot line, recorded and locked.

In the case 16a is the recording 14 provided, with a front part 17 whose end face 18 the alignment surface for the plane surface 2a of the federal government 2 of the tool holder 1 is. The front part 17 sits down inside the case 16a as an inner part 16c continues and ends machine side in training a driving pin 16d , see also in the 8th ,

In the front part 17 the recording 14 are radially directed two clamping bolts 20 and, preferably in each case by 90 ° to the clamping bolt 20 offset, two guide pins 19 arranged. These guide pins form together with those on the shaft 3 of the tool 1 provided grooves 4 said guide unit, which is a rotation of the tool holder about the center axis 26 prevents and also for a repeatable accurate positioning of the tool holder 1 is being used.

A view of the face of this adapter 16 show the 5a , There is preferably offset by 90 ° arrangement of the guide pins 19 to the clamping bolts 20 to see. From the clamping bolts 20 each protrudes its clamping nose 24 in the receiving area of the recording 14 into it.

The 5b shows a partial section along the center axis 26 through the front part 17 and by one of the clamping bolts 20 therethrough. In this view is still one of the guide pins 19 to see as well as the front portion of the receiving area of the recording 14 , the cocking nose 24 of the clamping bolt 20 as well as the frontal area 18 of the front part 17 , The cocking nose 24 is here in a position between the positions "open" and "stretched".

The clamping bolt 20 himself is in the 6a . 6b and 6c shown in details. A perspective in the 6a , A side view of the upright clamping bolt 20 in the 6b , which is designed here as a clamping screw. This clamping screw 20 is divided into a first section 21 , with an external thread 23 is provided and in a second section 22 on which the clamping nose 24 is trained. The cocking nose 24 sits off-center to the longitudinal axis of the clamping bolt 20 and preferably has the shape of a cylinder segment, in cross-section a circular segment, preferably smaller than the half surface, wherein in an advantageous embodiment, the circular arc has no constant radius.

Opposite the representation in 6a is the clamping bolt, the clamping screw 20 shown in this view rotated about 120 ° about its longitudinal axis.

In the 6c is the clamping screw 20 shown in section and opposite to the representation in 6a rotated 45 ° about the longitudinal axis. The inner surface of the clamping nose 24 can be seen in full width as well as the key intervention 25 , here designed for receiving an Allen key.

Another special embodiment of the invention is still in the 1a . 2a and 3a shown. Thus, in a preferred embodiment, the clamping surface 7 on a replaceable in and on the recess 5 arranged clamping part 10 provided arranged. The advantages of the exchangeable clamping part 10 have been mentioned earlier in the description.

In the 2 . 2a . 3 . 3a and 4 are further embodiments of the tool holder 1 shown where the receiving area, 9a . 9b and 9c has a different shape than the one in the 1 and 1a shown execution. Shown is a milling mandrel 11 , a tapping tool 12 and a so-called cylinder recording 13 , When displayed in 4 , the cylinder intake 13 , this special tool holder is opposite to the representations in the 1a . 2a and 3a 90 ° around its center axis 26 shown rotated, so here's a top view of the groove 4 he follows. In this 4 is the tool turret with dotted line 15 a machine tool indicated in which several shots 14 for tool holders 1 are provided. In this figure is also dash-dotted the position of the or the clamping bolt with respect to the recording 14 indicated.

In the 7a to 10b a variant embodiment of the new device is shown in which the clamping bolt for locking the shaft 3 in the recording 14 be used in a further specific embodiment. So is in the 7a to 7c shown that the clamping bolts specifically as a clamping pin 40 formed and on the inner surface 31 a clamping ring 30 are arranged. This clamping ring 30 has the said inner surface 31 , an outer surface 32 , as well as two end faces 33 and 34 , In a section of the outer surface 32 is a toothed section 35 intended. Each of the spigots 40 is at its end face, with the clamping surface 7 of the shaft 3 of the tool holder 1 . 11 . 12 and 13 cooperates for a further purpose specially trained. Thus, this end face has a guide surface 41 on, followed by a sliding surface 42 and a subsequent clamping surface 43 , This configuration ensures that in the rotating movement for clamping the chuck safely into the undercut 6 and thus behind the clamping surface 7 of the shank can be performed, if the plane surface 2a of the federal government 2 the tool holder after insertion of the shaft 3 in the recording 14 not directly brought close to the alignment surface.

At the the clamping surface 43 of the clamping pin 40 opposite end face is at least one inclined stop surface 44 provided, a recess 45 follows. These two surfaces are in the rotational movement "release" of the clamping ring with the respective on the flat surface 2a provided cam 8th in operative connection such that during the movement "release" the plane surface 2a from the alignment surface 18 is pushed away.

In the 8th is a longitudinal section through an adapter 16 shown in its basic structure according to the adapter 5 like. However, this is the front part 17 here for a clamping ring 30 educated. From the frontal area 18 of the front part 17 off are body in succession following a front hole 17a , a slightly smaller average diameter in the diameter 17b and a slightly smaller diameter in the rear hole 17c arranged. The front part 17 sits down in the machine direction as an inner part 16c continues and ends in a takeaway 16d , In this sectional view are still not provided with reference numerals bearing and guide elements of known type, in which the inner part 16c and partly the front part 17 are rotatably mounted and secured in the axial direction.

In the middle hole 17b becomes the clamping ring 30 rotatably recorded. In the front hole 17a be after inserting the clamping ring 30 Secured elements arranged, the axial movement of the clamping ring 30 only in the specified tolerances. In the figure is above the middle hole 17b another passage 17d shown. In this passage 17d becomes the actuator for movement / rotation of the clamping ring 30 added. Details about the actuator 50 are the following still using the 9a to 9c described.

The back hole 17c also serves to accommodate the shaft 3 ,

In the 9a . 9b and 9c is the inner part of an adapter 16 that is integral with the inner part 16c connected front part 17 shown.

9a shows a side view of said part, in which a tool holder 1 with his shaft 3 is introduced. The inner part 16c as well as the end driving pin 16d are opposite to that in the 8th shown embodiment provided with a different contour. This contour is due to specifications in the design of a tool turret. The new device is, as this illustration shows, often used variably. The 9b shows a section BB. Opposite the representation in 8th and 5 the part shown is rotated by 180 °. The tool holder 1 is with his shaft 3 in the front part 17 of the adapter. The adjusting screw 51 and the rack 52 The actuator is in the "cocked" position. It is shown that the rack 52 on the clamping ring 30 attacks and holds him in his position. The plane surface 2a of the federal government 2 lies on the face 18 of the front part 17 at.

The clamping ring 30 is in the middle hole 17b held and guided. On a representation of the front hole 17a arranged securing elements for the clamping ring 30 was omitted here for the sake of clarity. There are known from the prior art fuse elements. Furthermore, in this view, the position of the recess 5 clearly.

The 9c shows a cross section CC of the in the 9a shown view. In this view, in particular, the arrangement of the actuator 50 to see. As already mentioned, this setting unit exists 50 from a set screw, which is attached to a rack 52 attacks, with the rack 52 in the passage 17d is guided and with its toothed part with the toothed section 35 of the clamping ring 30 is in interference. A fuse 53 prevents on the one hand a twisting of the rack 52 in the preferably cylindrical passage 17d and limited in the direction of movement, the movement of the rack 52 and thus the rotational movement of the clamping ring 30 , Here, too, is clearly the location on the inner surface 31 of the clamping ring 30 arranged clamping pin 40 , The spigots 40 are with the clamping ring 30 made in one piece. The spigots 40 are in the position "stretched", so they lie in front of the clamping surfaces 7 of the shaft 3 , which also gives a clear view of the recesses 5 given is.

In the 10a is to further clarify the new clamping principle and the new version of the clamping parts of the clamping ring 30 without the other components holding it. In the shaft 3 are several recesses 5 incorporated. The number corresponds to that in the clamping ring 30 provided number of chucking pins 40 , In this embodiment, three recesses 5 and consequently also three chucking pins 40 intended. In this embodiment, there is no guide by guide pins 19 in connection with grooves 4 intended. The guiding function is provided by the three clamping pins 40 and the three recesses 5 with taken over. At the machine-side end of the shaft 3 is a take away 27 arranged; which protrudes from the end face (s. 10a ). This takeaway 27 sits with inserted tool holder 1 positively in a recess 17e attached to the rear hole 17c followed. As a result, very large torques can be transmitted.

After installation of the plane surface 2a at the relevant end face of the clamping ring 30 becomes the clamping ring 30 by means of its toothed segment 35 and the - not shown here - actuator 50 turned to the right, so that the guide surface 41 followed by the sliding surface 42 and then the clamping surface 43 behind the clamping surface 7 of the shaft 3 lie, that is, the clamping surface 43 at the clamping surface 7 over the entire area, see also in the 10b ,

All mentioned in the above description as well as only alone Removable from the drawing features are further components of Invention, even if not particularly highlighted and in particular not mentioned in the claims.

The Invention is not limited to the embodiment described, but in the context of the disclosure often variable.

1

toolholder (Collet)

2

Federation

2a

plane surface

3

shaft

4

groove (Guide unit)

5

recess

6

undercut

7

clamping surface

8th

cam

9 9a, 9b, 9c

reception area (for the tool)

10

tensioning part

11

arbor

12

Gewindebohrzange

13

cylinder intake

14

Recording for pos. 3 from pos. 1 . 11 . 12 and 13

fifteen

tool turret a machine

16

adapter

16a

casing

16b

housing journal

16c

inner part

16d

driving pins

17

front part

17a

front drilling

17b

middle drilling

17c

rear drilling

17d

passage

17e

recess

18

Face v. Pos. 17

19

guide pins

20

clamping bolt

21

first section

22

second section

23

external thread

24

clamping nose

25

key intervention

26

central axis

27

entrainment

30

clamping ring

31

palm

32

outer surface

33 34

faces

35

toothed section

40

chucking spigot

41

guide surface

42

sliding surface

43

clamping surface

44

stop surface

45

indentation

50

actuator

51

screw

52

rack

53

fuse

Claims (11)

Device for clamping a tool holder in a receptacle of a revolver of a span lifting machine tool or machining center, wherein the tool holder ( 1 ; 11 ; 12 ; 13 ), along its center axis ( 26 ), a tool receiving receiving area ( 9 ; 9a ; 9b ; 9c ) and a shaft ( 3 ), between the receiving area ( 9 ; 9a ; 9b ; respectively. 9c ) and the shaft ( 3 ) a common federal government ( 2 ), the Federal Government ( 2 ) on the shaft side a precision plane surface ( 2a ), for engagement with an alignment surface of the revolver, the shaft ( 3 ) can be inserted into the receptacle of the tool turret and releasably locked in selbiger, this is the shaft ( 3 ) in its peripheral surface one axially and the collar ( 2 ) directed recess ( 5 ), which near the Bund in a transverse undercut ( 6 ), this undercut ( 6 ) one to the plane surface ( 2a ) of the Confederation ( 2 ) facing clamping surface ( 7 ), arranged in the turret receiving a lying transversely to the insertion direction, preferably radially aligned clamping bolt ( 20 ) is assigned such that when inserted shaft ( 3 ) and the working step "tightening" the clamping bolt ( 20 ) on the clamping surface ( 7 ) and the plane surface ( 2a ) is precisely used on the alignment surface of the revolver and at the same time locked, characterized in that the shaft ( 3 ) several recesses ( 5 ) together with the associated undercut ( 6 ) and the recording in the revolver according to several clamping bolts ( 20 ) assigned. Apparatus according to claim 1, characterized in that the clamping bolts in the form of clamping pins ( 40 ) on a clamping ring ( 30 ) are arranged, the clamping ring ( 30 ) is arranged in the end face region of the receptacle and on the receptacle an actuating unit ( 50 ) for moving the clamping ring ( 30 ) is provided. Apparatus according to claim 2, characterized in that each chuck ( 40 ) at its the clamping surface ( 7 ) of the tool holder facing end face a guide surface ( 41 ), a sliding surface ( 42 ) and a clamping surface ( 43 ) having. Apparatus according to claim 2, characterized in that the actuating unit ( 50 ) at least one set screw ( 51 ) and a rack ( 52 ), wherein the rack ( 52 ) with a toothed section ( 35 ) on the outer surface ( 32 ) of the clamping ring ( 30 ) is in operative connection. Apparatus according to claim 4, characterized in that the actuating unit ( 50 ) a fuse ( 53 ) associated with the longitudinal movement of the rack ( 52 ) and a rotation of the rack ( 52 ) prevented. Device according to one of claims 1 to 5, characterized that recording for the tool holder integral part of the tool turret is. Device according to one of claims 1 to 5, characterized in that the receptacle for the tool holder in an adapter ( 16 ) which ( 16 ) in a bore of the tool turret ( 15 ) is receivable and releasably lockable. Device according to one of claims 1 to 7, characterized in that in the region of the undercut ( 6 ) on the plane surface ( 2a ) a cam ( 8th ) is provided to which the mounted in the turret clamping bolt ( 20 ) strikes when he ( 20 ) is actuated to release the lock, so that the plane surface ( 2a ) is pushed away from the alignment surface of the revolver. Device according to one of claims 1 to 8, characterized in that on the circumference of the shaft ( 3 ) at least one axially directed groove ( 4 ) is incorporated as part of a guide unit whose other, preferably leading part preferably in the shaft ( 3 ) receiving receptacle is arranged. Device according to one of claims 1 to 9, characterized in that the clamping surface ( 7 ) on the shaft ( 3 ) of the tool holder on a clamping part ( 10 ), which ( 10 ) in and on the recess ( 5 ) is arranged. Apparatus according to claim 10, characterized in that the clamping part ( 10 ) replaceable on the recess ( 5 ) is attached.