DE10317345B4 - Quick clamping system with centering device - Google Patents

Abstract

Quick clamping system with a quick clamping cylinder (1) and a workpiece pallet (22) placed on it or an adapter part (21) placed thereon and a centering device (13) between the quick clamping cylinder (1) on the one hand and the workpiece pallet (22) or the adapter part (21) on the other, wherein the centering device (13) comprises a V-groove arranged on the workpiece pallet (22), the adapter part (21) or the quick-release cylinder (1), into which a V-groove on the opposite quick-release cylinder (1), on the opposite workpiece pallet (22) or on the opposite adapter part (21) arranged, having conical bevels, deformable and approximately round-profiled body engages,
characterized,
that the centering device (13) has a lower part (29) arranged on the quick-release cylinder (1), the workpiece pallet (22) or the adapter part (21) so that it can be replaced with the aid of at least one screw (40; 52) and a lower part (29) with the aid of at least one screw (31 ; 53) comprises an upper part (28) arranged on the workpiece pallet (22), the adapter part (21) or the quick-release cylinder (1),
wherein the V-groove is arranged on the upper part (28) of the centering device (13).

Description

The invention relates to a quick release system with a centering device according to the preamble of claim 1.

With the subject of U.S. 4,662,043 a quick release system is known in which there is centering in the circumferential direction between a quick release system and a workpiece pallet placed on it.

The centering consists essentially of two interlocking conical bevels.

The known arrangement has the disadvantage that it is not protected against wear. It tends to knock out and then has to be replaced at high cost.

With the one going back to the same inventor EP 0 936 025 A1 Another quick release system with a centering device has become known, which consists of an elastically deformable tube that is screwed into a recess on the underside of the workpiece pallet. The tube is elastically deformable and engages in a conically bevelled V-groove in the top of the lid of the quick release system.

This embodiment has the disadvantage that the elastically deformable tube engages in an upwardly directed, open recess in the cover. This means that there is a risk that dirt and chips will settle in this recess, as a result of which the centering device no longer functions properly. In particular, there is a risk if there is drilling water in the recess on the cover side, which is open at the top, and it cannot be seen whether there are still chips or other solid objects hidden underneath.

When the retractable nipple connected to the workpiece pallet is placed in the upwardly open recess in the cover, the workpiece pallet can therefore be placed on the cover in a non-centered and tilted manner, which is not readily apparent.

Because the upwardly open recess did not have any bevels, there was a high risk of injury to the elastically deformable tube to be inserted in this recess.

The attachment of the deformable tube in an assigned precision groove on the underside of the workpiece pallet is extremely complex and difficult because the pallet is aligned as a whole with zero-point orientation and accordingly has zero-point-oriented, highly precise fitting bores for fastening the workpieces to be machined on it. Depending on the position of these fitting bores, the centering recess for the centering device must also be made with high precision on the underside of the workpiece pallet, which is only possible with the complex processing steps mentioned above.

The attachment of the tube in the opening on the underside of the pallet, which is open at the bottom, meant that the tube itself also had to be laboriously processed so that it is positioned correctly and standing in the bottom surface of the recess. For this reason, the contact surface of the tube had to be machined. In addition, the fastening of the tube with a screw located in the tube was extremely difficult because the screw was difficult to operate due to the laterally open end faces of the tube.

Since it is a relatively thin-walled centering tube, it was difficult to operate the respective screws over several screw turns through the end faces of the open tube.

Another disadvantage of the known arrangement is that it cannot be replaced. If there was an accident during the processing of workpieces in such a way that, for example, the workpiece pallet was forcibly hit by a processing workpiece, then the centering tube was elastically deformed in the sense of a shearing movement and left a corresponding pressure surface on the inside of the V-shaped centering groove. Overall, this resulted in a loss of centering. The upper parallel groove for receiving the centering tube was also damaged in the event of an impermissible impact on the workpiece pallet, which led to the failure of the centering.

Since the recesses cannot be reworked, the entire workpiece pallet was so badly damaged when the machine was operated causing damage that it had to be replaced.

The recess in the cover was also damaged, so that the cover had to be replaced as a whole, which was associated with high repair costs.

The two centering grooves assigned to one another in the underside of the workpiece pallet and in the upper side of the cover were paired with one another and this pairing became unusable in the event of corresponding damage or wear. This meant that the workpiece pallet and the cover had to be can be exchanged together if only one part was damaged.

When using the quick-release cylinder to turn workpieces on a lathe, it could happen that the centering device could not withstand the high driving forces, sheared off and accidents occurred as a result.

the DE 199 58 937 A1 discloses a clamping station with a workpiece pallet and a centering device which comprises V-grooves arranged on lifting modules and centering bodies in the form of ball centering pins which are screwed to the workpiece pallet and which engage in the V-grooves.

The invention is based on the object of developing a quick release system with a centering device of the type mentioned at the outset in such a way that the centering device can be repaired easily and inexpensively in the event of impermissible, damage-prone machine actuation. In the case of automated workpiece machining, in which over a thousand alternations take place, the function of the centering device should be guaranteed over a long period of time.

This object is achieved according to the invention by a quick release system according to claim 1.

In a preferred embodiment of the invention it is provided that the centering device is designed in two parts and consists of a lower part on which an elastically deformable bracket is molded. The bracket engages in a V-shaped groove having relatively large inlet curves on the upper part and is centered in this groove.

Instead of a tube according to the prior art, an approximately eye-shaped round part is now used as a centering device, which is molded onto a lower part in the form of an omega part.

This results in a large load-transmitting cross section for the omega-shaped bracket part because it is molded directly onto a lower part and is no longer designed as a separately screw-on tube.

The lower part is easily replaceable with the help of screws on one side of the quick release device, while the opposite upper part is also interchangeable with screws on the opposite side, for. B. is arranged on the underside of a workpiece pallet or an adapter part.

According to an essential feature of the invention it is provided that the lower part with the upwardly directed omega-shaped centering part is arranged on the upper side of the quick-release cylinder, namely outside the cover area. This has the advantage that the cover itself no longer takes part in the load transfer of the centering device and could be rotated unintentionally.

According to a first embodiment it is provided that the omega-shaped centering part is fitted into the housing of the clamping cylinder with high precision.

In another embodiment it can be provided that the omega-shaped centering part is fitted directly into the machine itself with high precision.

In the general part of the description it was stated that such a centering part should absorb a high force in the circumferential direction. For this reason, the omega-shaped part is highly resilient in the circumferential direction and the opposite groove in the upper part is also designed to transfer loads to a high degree, so that high torsional forces can be absorbed safely and without locking.

In the associated V-shaped groove arranged in the upper part, large inlet bevels are arranged, so that there is a large catching area for the centering part. In this way, the workpiece pallet can be placed on the omega-shaped centering part arranged on the housing side with a large amount of torsional backlash, and perfect centering occurs due to the large inlet bevels described.

This can be represented symbolically by designating the lower part with the omega-shaped centering part as a truncated pyramid-shaped part, which, viewed over its axial length, has large inlet radii, which interact with associated, corresponding inlet radii on the likewise truncated pyramid-shaped bevels of the upper part. This results in a high load transfer.

Because the load transfer is not transferred to the cover in the circumferential direction, but directly to the housing of the quick-release cylinder outside of the cover, a much more effective introduction of the torsional forces directly onto the machine table is given.

It was stated above that the centering device according to the invention has to withstand thousands of load changes and corresponding wear can be compensated for. For this purpose, the invention provides that both the contact surfaces of the lower part and the contact surfaces of the upper part can be underlaid with assigned adjusting plates or foils, so that Corresponding changes in distance can be installed and thus any wear is compensated for.

In another embodiment, it is also possible for the lower part and / or the upper part to be cast into the associated recesses in order to ensure easy interchangeability and to achieve a corresponding shape adaptation to the corresponding grooves.

Due to the fact that the centering device is installed in the opposite direction compared to the prior art, it is also ensured that no dirt and water nests open upwards are formed. Any dirt deposited on the top of the centering device is carried away downwards and to the side without an undesired dirt pick-up being formed.

Because the centering device consisting of the upper and lower part is fastened in the associated fastening parts by means of screws, it can be quickly exchanged. This is a significant advantage over the prior art, because there it was only possible to replace the workpiece pallet or the cover of the quick-release cylinder as a whole.

If the centering unit is damaged, only the parts of the centering unit itself need to be replaced, which can be done in a few minutes.

In the following, the invention is explained in more detail with reference to drawings showing only one embodiment. Further features and advantages of the invention that are essential to the invention emerge from the drawings and their description.

• 1: Perspektivische Ansicht auf einen Schnellspannzylinder mit einer Zentriereinrichtung nach der Erfindung;
• 2: Draufsicht auf eine gegenüber 1 leicht abgewandelten Ausführungsform;
• 3: eine Teildarstellung der Ansicht nach 2;
• 4: Schnitt durch eine gegenüber 1 bis 3 abgewandelte Ausführungsform mit einer Zentriereinrichtung im Bereiche zwischen einem Schnellspannzylinder und einem darauf aufgesetzten Adapterteil;
• 5: die Unteransicht des Oberteils;
• 6: Schnitt durch die Zentriereinrichtung nach 4 in einer um 90° gedrehten Lage;
• 7: die Draufsicht auf das Unterteil;
• 8: die Unteransicht auf das Oberteil;
• 9: die Draufsicht auf das Oberteil gemäß 5;
• 10: Schnitt in einer vergrößerten Darstellung im Vergleich zur 6;
• 11: ein um 90° gedrehter Schnitt durch die Anordnung nach 10;
• 12: die Seitenansicht des Oberteils;
• 13: die Seitenansicht des Unterteils;
• 14: die Draufsicht auf das Unterteil;
• 15: die Unteransicht des Unterteils;
• 16: die Draufsicht auf die Einstellbleche;
• 17: eine gegenüber 4 abgewandelte Ausführungsform, bei der unmittelbar auf einen Schnellspannzylinder eine Werkstückpalette aufgesetzt ist, die als Lochrasterpalette ausgebildet ist;
• 18: eine gegenüber 18 abgewandelte Ausführungsform, bei der anstatt einer Lochrasterpalette ein Adapterteil mit der Zentriereinrichtung zusammenwirkt und auf dem Adapterteil über einen weiteren Schnellspannzylinder die Werkstückpalette befestigt ist.

Show it:

• 1 : Perspective view of a quick release cylinder with a centering device according to the invention;
• 2 : Top view of an opposite 1 slightly modified embodiment;
• 3 : a partial representation according to the view 2 ;
• 4th : Cut through an opposite 1 until 3 modified embodiment with a centering device in the area between a quick-release cylinder and an adapter part placed on it;
• 5 : the bottom view of the upper part;
• 6th : Section through the centering device according to 4th in a position rotated by 90 °;
• 7th : the top view of the lower part;
• 8th : the bottom view of the upper part;
• 9 : the top view of the upper part according to 5 ;
• 10 : Section in an enlarged view compared to 6th ;
• 11 : a section rotated by 90 ° through the arrangement according to 10 ;
• 12th : the side view of the upper part;
• 13th : the side view of the lower part;
• 14th : the top view of the lower part;
• 15th : the bottom view of the lower part;
• 16 : the top view of the adjustment plates;
• 17th : one opposite 4th Modified embodiment, in which a workpiece pallet is placed directly on a quick-release cylinder, which is designed as a perforated grid pallet;
• 18th : one opposite 18th Modified embodiment in which, instead of a perforated grid pallet, an adapter part interacts with the centering device and the workpiece pallet is attached to the adapter part via a further quick-release cylinder.

In 1 is a perspective view of a first embodiment of a quick release cylinder 1 shown, of a central recording 2 trains. Below a lid 3 are locking balls distributed around the circumference 4th arranged, which in the radial direction by a piston not shown (locking piston 26th after 4th ) are operable. A central receptacle is arranged on the underside of a workpiece pallet, over the lid 3 is turned over. The locking balls lie against assigned, not shown, bevels on the inside of the receptacle of the workpiece pallet and lock the cover 3 .

The workpiece pallet lies on a circumferential, precisely machined support surface 6th and comes with a centering edge 5 on the lid 3 centered.

The centering device according to the invention 13th is in the area of the contact surface 6th arranged, of which only a centering bracket 14th is shown, which is in a recess 15th in the housing 12th of the quick release cylinder 1 is arranged.

The locking balls 4th are evenly distributed around the circumference 8th , 9 supplied with blown air to keep it free from contamination. Likewise are the blow-out holes 8th in the support surface 6th arranged to also protect this from contamination to keep clear. The compressed air required for this is supplied via the air connection 10 introduced.

One of the blow-out holes 8th supplies the centering device 13th with blown air to keep it free from dirt.

The supporting surface 6th carries a sealing ring radially outwards 7th to avoid the ingress of dirt from outside the support surface.

At the front of the case 12th is an oil connection 11 for actuating the locking piston 26th intended.

According to 2 can in the area of the support surface 6th still a large number of media feed-throughs 16 be arranged.

These are fluid or air-carrying couplings in the housing 12th of the quick release cylinder 1 are arranged, which lead upward through the quick release cylinder. To 4th becomes one above the quick release cylinder 1 arranged, further quick-release cylinder 23 supplied with compressed air or pressure oil.

The entire case 12th is by means of screws 54 (please refer 17th ) through the screw holes 20th reach through, on a machine table 49 screwed tight.

In 2 is the lower part of the centering device 13th shown with the more detailed in the 8th until 13th illustrated screws 40 in the housing 12th are attached. The lower part 29 is therefore in the area of a slot-shaped recess 18th in the housing 12th attached.

the 4th now shows the installation situation of a centering device according to the invention 13th in a double-decker quick-release cylinder system.

On a lower quick release cylinder 1 is an adapter part 21 put on and with the help of the centering device according to the invention 13th centered. The adapter part 21 can also be replaced directly by a workpiece pallet, which is why the terms adapter part have been used in the following drawings and their description 21 and workpiece pallet placed on it 22nd used synonymously.

In the embodiment shown, the adapter part carries 21 another quick release cylinder 23 , which in turn has a retractable nipple 19th the workpiece pallet 22nd moves in. It is a two-story structure, with the centering between the quick-release cylinder 1 and the adapter part placed on it 21 he follows.

The lid 3 of the quick release cylinder 1 is with the help of screws 25th directly to the housing 12th screwed, creating an absolutely secure and twist-proof fixing of the cover 3 is guaranteed. The cover forms with the housing 12th a lower press fit and the aforementioned centering edge 5 lies in the correct position and with great precision on the opposite stop ring 24 of the adapter part 21 at.

The locking of the locking balls 4th takes place by springs which are evenly distributed around the circumference of the housing and which are pressed against the underside of a locking piston 26th act by means of a beveled locking lug 27 the locking balls in the associated run-in bevel on the inner circumference of the stop ring 24 press-fit. This becomes the adapter part 21 in the feed direction downwards onto the housing 12th of the quick release cylinder 1 used and held there. It is a form-fitting connection between the two parts.

If above the aforementioned oil connection 11 Pressure oil in a pressure chamber 17th is inserted, the locking piston 26th Move down against the force of the spring and release the locking balls 4th get out of engagement with the associated stop ring 24 on the adapter part 21 .

The centering device according to the invention 13th consists essentially of an upper part 28 that is on the underside of the adapter part 21 is attached and from a lower part 29 that is in the housing 12th of the quick release cylinder 1 is let in.

To 8th and 9 the upper part is approximately elongated and has a rounded, elongated flange 41 on, which has a conical upward centering neck 32 wearing. In the flange 42 are holes 30th for the fastening screws 31 intended. With these fastening screws, the upper part is in an assigned, precisely machined hole 33 used. The hole forms lateral mating surfaces 44 for the engagement of the centering neck 32 to form a large and form-fitting contact surface. The face of the centering neck 32 instructs a game 34 to the opposite end face in the adapter part 21 to allow sufficient adjustment play. The axial setting clearance is determined by setting plates or setting foils 37 reached that on the flange 41 placed and a defined distance of the upper part in the hole 33 result.

With a corresponding wear of the centering neck 32 thicker adjustment plates 37 after 10 on the fastening screws 31 launched like this in 16 is shown.

The attachment of the upper part can be to the adjustment play 57 due to the different thicknesses of the adjustment plates 37 to be changed.

the 12th shows the side view of the centering neck 32 that deals with the mating surface 44 in the assigned hole 33 centered.

According to the 10 until 16 the lower part consists of an elongated flange 41 , the holes for the screws to pass through 40 having.

The flange 41 carries another, round flange 43 reduced diameter, with this in an associated, lower mating surface 45 in an associated recess 18th in the housing 12th is let in.

Also the depth of penetration of the lower part 29 can by interposing adjustment plates 37 or foils towards the top 28 to be changed. This is in 10 and 16 shown.

The lower part 29 engages positively in the wedge recess 35 of the top 28 into it. To the upper flange 41 is the omega-shaped centering bracket 14th molded, which is elastically deformable.

The centering bracket 14th is part of the lower part 29 , which preferably consists entirely of spring steel.

Dives according to 13th the omega-shaped centering bracket 14th into the aforementioned wedge recess 35 of the top 28 then it deforms as shown in 13th along line 14 '. This means that it is squeezed together and can absorb high torsional forces if the workpiece pallet or the adapter part is in the direction of the arrow 47 against the centering bracket 14th is pressed.

This means that there is an exact alignment in the wedge recess 35 guaranteed. According to 10 is the centering bracket 14th also bevelled laterally and therefore has wedge surfaces 36 on, which is form-fitting on the inside of the wedge recess 35 invest.

The wedge recess 35 has lower, relatively large inlet curves 38 so that the top wedge recess 35 with a large lateral offset on the lower centering bracket 14th is placed and the two parts are centered with one another due to the large inlet curves.

Seen from the side, the centering bracket forms 14th a beveled radius head part 39 that is the wedge surface 36 trains.

Due to the large clearance in the middle of the centering bracket 14th (Transverse hole 46 ) results in a favorable deformation. By making the transverse hole 46 larger diameter in a lower clearance 48 smaller diameter passes, the centering bracket can 14th only in the in 13th Deform the position shown in dashed lines without it being subjected to shearing in its foot area.

In the area of the aforementioned blow-out holes 8th is in the lid 3 also one of the centering devices 13th opposite blow-out hole 50 arranged to clean them with appropriate blown air and to keep them free from contamination.

the 17th shows that the quick release cylinder 1 instead of an adapter part 21 directly on a workpiece pallet 22nd can be placed, which is designed as a breadboard pallet. Here is the top 28 used at the bottom of the workpiece pallet, while the lower part 29 into the associated recess in the housing 12th is fitted.

The quick release cylinder 1 is with the help of screws 54 on the machine table 49 set. The exhaust air is supplied via the air connection 10 and a riser duct 51 fed, from where the air into an annular channel 58 where it is distributed to other blow-out points.

The embodiment according to 18th shows the two-story structure of the similar to 4th . It is shown there that an adapter part 21 on the quick release cylinder 1 is put on, which in turn has a quick-release cylinder 23 that carries over the retractable nipple 19th with the workpiece pallet 22nd connected is.

Here, too, is the centering device 13th in a modified form as an anti-twist device between the quick-release cylinder 1 and the adapter part 21 executed.

The top 28 is only with one screw 53 set from the top of the adapter part, while the lower part 29 with a screw 52 from the bottom of the case 12th of the quick release cylinder 1 is fixed.

This has the advantage that there are no lateral screws in the support area of the support surface 6th are present, as shown in 1 is shown.

the 10 and 14th show that the centering bracket 14th from the flange 42 obliquely upwardly directed radius surfaces 56 forms that form a positive fit via the in 10 illustrated contact lines 55 to the inside of the wedge recess 35 invest. Because of the thickening on the foot side due to the radius surface 56 is the centering bracket 14th particularly stable, and is well secured against shearing.

In the event of incorrect machine operation, the centering bracket will bend in the extreme 14th in the circumferential direction and deforms back elastically without fear of further damage.

In addition, the invention is not limited to the fact that the lower part 29 in the quick release cylinder and the upper part 28 is arranged in the workpiece pallet. In a kinematic reversal, it can also be provided that the upper part 28 in the quick release cylinder and the lower part 29 in the workpiece pallet 22nd or an adapter part 21 is arranged.

List of reference symbols

1

Quick release cylinder

2

recording

3

lid

4th

Locking ball

5

Centering edge

6th

Support surface

7th

Sealing ring

8th

Blow-out hole

9

Blow-out hole

10

Air connection

11

Oil connection

12th

casing

13th

Centering device

14th

Centering bracket

15th

Recess

16

Media implementation

17th

Print hem

18th

Recess

19th

Retractable nipple

20th

Screw hole

21

Adapter part

22nd

Workpiece pallet

23

Quick release cylinder

24

Stop ring

25th

screw

26th

Locking piston

27

Locking tab

28

Top

29

Lower part

30th

drilling

31

screw

32

Centering neck

33

drilling

34

game

35

Wedge recess

36

Wedge surface

37

Adjustment plate

38

Inlet curve

39

Radius head part

40

screw

41

Upper flange (lower part 29 )

42

Flange top (upper part 28 )

43

Flange bottom (lower part 29)

44

Mating surface (top)

45

Mating surface (below)

46

Transverse hole

47

Direction of arrow

48

exemption

49

Machine table

50

Blow-out hole

51

Riser duct

52

screw

53

screw

54

screw

55

Contact line

56

Radius surface

57

Adjustment play

58

Ring channel

Claims (11)

Quick clamping system with a quick clamping cylinder (1) and a workpiece pallet (22) placed on it or an adapter part (21) placed thereon and a centering device (13) between the quick clamping cylinder (1) on the one hand and the workpiece pallet (22) or the adapter part (21) on the other, wherein the centering device (13) comprises a V-groove arranged on the workpiece pallet (22), the adapter part (21) or the quick-release cylinder (1), into which a V-groove on the opposite quick-release cylinder (1), on the opposite workpiece pallet (22) or on the opposing adapter part (21) arranged, having conical bevels, deformable and approximately round-profiled body engages, characterized in that that the centering device (13) has a lower part (29) arranged on the quick-release cylinder (1), the workpiece pallet (22) or the adapter part (21) so that it can be replaced with the aid of at least one screw (40; 52) and a lower part (29) with the aid of at least one screw (31 ; 53) comprises the upper part (28) arranged on the workpiece pallet (22), the adapter part (21) or the quick-release cylinder (1), the V-groove being arranged on the upper part (28) of the centering device (13). Quick release system according to Claim 1 , characterized in that an elastically deformable centering bracket (14) is formed on the lower part (29) which engages in the associated V-groove on the upper part (28) and is centered in this groove. Quick release system according to Claim 2 , characterized in that the centering bracket (14), starting from a flange (42), forms obliquely upwardly directed radius surfaces (56) which lie against contact lines (55) on the inside of the V-groove in the upper part (28). Quick release system according to one of the Claims 2 or 3 , characterized in that the elastically deformable centering bracket (14) is designed as a bracket part with an approximately omega-shaped cross section. Quick release system according to Claim 4 , characterized in that the omega-shaped centering bracket (14) has an upper transverse hole (46) of larger diameter, which merges into a lower clearance (48) of smaller diameter in the direction of the foot side. Quick release system according to one of the Claims 1 until 5 , characterized in that the V-groove on the upper part (28) has an inlet curve (38). Quick release system according to one of the Claims 1 until 6th , characterized in that the lower part (29) is arranged on the top of the quick release cylinder (1) outside a cover (3) of the quick release cylinder (1). Quick release system according to one of the Claims 1 until 7th , characterized in that, to compensate for wear of the centering device (13), both the contact surfaces of the lower part (29) and the contact surfaces of the upper part (28) can be underlaid with associated adjusting plates (37) or foils. Quick release system according to one of the Claims 1 until 8th , characterized in that the lower part (29) is fastened in the region of a slot-shaped recess (18) in a housing (12) of the quick-release cylinder (1). Quick release system according to one of the Claims 1 until 9 , characterized in that the upper part (28) is elongated and has a rounded, elongated flange (41) with bores (30) for fastening screws (31) and the flange carries a centering neck (32) which extends conically upwards. Quick release system according to one of the Claims 1 until 10 , characterized in that the lower part (29) consists of spring steel.

Images