DE3320044C2 - Face drivers, in particular for lathes - Google Patents

Abstract

A face driver, especially for lathes, has an essentially cylindrical driver head which can be driven by the machine spindle and which carries a number of axially protruding driver elements on its free end face that can be brought into engagement with the workpiece and which are distributed around a centering point arranged coaxially with the driver head are arranged. In order to allow easy adaptation to different operating conditions with maximum concentricity of the workpiece held on the center point, the arrangement is such that the driver head (16) rotatably in a guide bushing (2) which has a device (4, 5) for coupling with the machine spindle and is axially displaceable and is coupled to an adjusting device by means of which it can be adjusted in the axial direction in the guide bushing (2) and that the centering tip (15) is rigidly connected to the guide bushing (2).

Description

3 4

Face driver according to the invention characterized thereby in the part lying under its axis of symmetry 1 in draws that the driving head illustrates in a facility axial section He has one in the wezur Coupling with the machine spindle having sentlichen cylindrical guide bushing 2, which on Guide bush rotationally fixed and axially movable on one side with a flange 3 of larger diameter gert and coupled to an adjusting device is formed by 5, in which evenly distributed all around which he is provided in the guide bushing in the axial direction adjustment axial bores 4 that allow the

is bar and that the centering point is rigid with the guide on a spindle, not shown, for example

Rungsbüchse is connected to a lathe, attached guide bush 2 with

With this face driver, the driver head of the machine spindle can be screwed together. At the Fühim If necessary simply out of the guide bushing 10 bushing 2, centering surfaces 5 are provided, which taken and by a driving head of other corresponding centering surfaces of a likewise not verBauart can be replaced without the driver-illustrative receiving flanges being assigned for this purpose. head would have to be dismantled. The rigid with the In the guide sleeve 2 is a right angle to the Guide bushing and thus the machine spindle along transverse wall 6 running symmetry or axis of rotation Bound center point ensures the highest possible roundness 15 used on an annular shoulder 7 of the guide running accuracy of the workpiece bushing 2 received on it, axially supported and through around the umkes. at the end of the guide bush are arranged

In a preferred embodiment, the guide 8 is rigidly connected to the guide bush 2 Centering pin 10 is inserted, which is preferably detachably fastened. The transverse wall can carry a fastening flange 11 and a coaxial thread coincident with corresponding guide parts of the joint connector 12 the non-rotatable connection and is non-rotatably connected between the driver head and the guide bushing 25 to the transverse wall 6 by means of screws indicated at 14. A center point 15 is screwed onto the thread screw, which is zen 12

Very simple structural conditions result, aligned precisely coaxially with the axis of rotation 1 and above

if the adjusting device is rigidly connected to the transverse wall 6 with the driver head with the guide bush 2

connected, is displaceable in the guide bush.

has led pressure plate, which with a coupling 30 In the guide sleeve 2 is also a cylindrical

device for a centrally acting pull rod shear driving head 16 used, which is in the guide

is trained. The pressure plate on which the bushing 2 is guided in a longitudinally displaceable manner.

The side of the transverse wall facing away from the driver head carries the driver head 16 on its side from the guide bush

ordered and with the driver head by means of 2 protruding end face indicated at 17

corresponding openings of the transverse wall running 35 ge driver elements, which are used for the positive coupling

Connecting elements be rigidly connected. This distribution with a recorded on the center point 15

Binding elements can be used by coaxially arranged workpiece, not shown.

Bolts can be formed, which at the same time act as guide elements. The driver elements 17 can be

works. head 16 rigid or sprung in the axial direction

It is also useful if there are ties between the carry-along. The driver head 16 can, however, insbemerkopf and the pressure plate on the cylindrical BoI- special in the wheat known from DE-PS 11 29 803 attached cylindrical spacer sleeves arranged se be designed such that the driver elements which are longitudinally displaceable in the openings of the transverse wall 17 on in axial cylinder bores of the driver are led. If there is not enough space for the head 16 axially displaceable driving piston, the transverse wall can be arranged interchangeably with the centering pin 45, with the one with a pressure pin coaxial, cylindrical fluid-filled cylinder bores, protruding on one side, hydraulic drive pins wear, on which the pressure plate are connected to one another, so that an axial self-corresponding Bearing bore axially displaceable, simulating effect of the driver elements in the Zugertist. interact with a not exactly planned

The driver elements can be accommodated in a simple 50 end face of the center point 15

Embodiment is given rigidly on the face of the entrained workpiece.

Merkopfe- be attached. The driver head can be on the side facing away from the driver head 16 but also in the known from DE-PS 11 29 803 the transverse wall 6, a pressure plate 18 is arranged, which Way with hydraulically self-balancing with one another is mounted in the guide bush 2 so as to be longitudinally displaceable the driver piston be provided, with the arrangement 55 and on their outside a coaxial thread arrangement is then made in such a way that the driver bushing 19 carries with which it is connected to a not shown elements are each coupled to an adjusting device in cylinder bores of the take-along pull rod Merkkopfes axially displaceable piston can be attached.

are arranged and the filled with a pressure medium With the pressure plate 18 is the coaxial to it entrainment

Cylinder bores hydraulically connected to one another «- 60 head 16 via evenly distributed, axially

who are. extending cylindrical screw bolts 20 rigid

In the drawing, an embodiment of the Ge is connected, which by cylindrical spacer sleeves 21

Subject of the invention shown. Extend the drawing through which the pressure plate 18 and the

shows a face driver according to the invention in an adjacent parallel face of the driver

ncr side view, partly in axial section, under 65 head 16 held at a predetermined distance.

Illustration of two different axial th which is greater than the thickness of the transverse wall 6.

Positions of the driver elements. The spacer sleeves 21 run through corresponding ones

The Siirnmitnehmer shown in the figure is in axial bores 22 of the transverse wall 6, the guide

5 6 fr

directions for the distance acting as guide parts

form sleeves 21 and in cooperation with the Di- fa

punch sleeves 21 and the screw bolt 20 an axially 0;

movable but non-rotatable connection between β

the driver head 16 and the guide bush 2

place. j:

The pressure plate 18 is also still on the guide "f:

guide pin 10 guided centrally The guide pin U

10 can also be omitted if this takes into account |

the space is appropriate. 10 1

The center point 15 is in turn by a |

corresponding keyway of the driver head 16 |

gripping wedge 23 rotatably with respect to the driver |

head 16 and thus the guide sleeve 2 held. | ^!

The center hole of the workpiece is set to 15 J ₁

the centering point 15 placed and ti with the tailstock

added tip, while the driver elements - ■

17 in the axis of symmetry or rotation above 1 are in the axially retracted position shown, which is determined by the fact that the pressure plate 18-20 based on the section shown below the axis of symmetry or rotation 1 - up to Stop of the driver head 16 on the transverse wall 6 is withdrawn to the left by the pull rod coupled to the threaded bushing 19. As well as the work 25 piece is received on the tips, the pressure plate 18, based on the figure, is advanced to the right, whereby the driver elements 17 are brought into engagement with the end face of the workpiece. the

Limit position for this axial feed movement of the 30 ^H ₍ Driver head 16 is in the figure below the sym- ■) <

metric or axis of rotation 1 illustrates; she is then given when the pressure plate 18 on the transverse wall 6 is applied

35 '

1 sheet of drawings

Claims (9)

1 2 are hydraulically connected to one another. Patent claims: 1. Face driver, especially for lathes, with a 5 able, essentially cylindrical driver- The invention relates to a face driver, in particular head, which on its free end face a number of axially special for lathes, with a machine spindle drivable through the machine spindle, which can be driven into engagement with the workpiece, which see around a drive head, which is coaxial on its free end face the driver head arranged rigid 10 a number of protruding, are arranged distributed with the workpiece in a single-centering point, thereby carrying driver elements that can be brought to a grip, which are characterized all around that the driver head (16) is a coaxial to the driver head arranged rigid in a device (4, 5) are arranged distributed to the coupling with the centering point.
Machine spindle having guide bush (2) A face driver with these features is from the rotatably and axially displaceably mounted and known with a 15 DE-PS 11 29 803 In this tuning driver ner adjusting device is coupled through which it is in the center point in the driver head against the spring Guide bush (2) adjustable in the axial direction of the tension mounted axially displaceable, while the and that the centering tip (15) is rigid with the Füh- driver elements itself in the driver head bushing (2) is connected to longitudinally displaceable drive pins or 2. Voice pickup according to claim 1, characterized in that 20 pistons are mounted, which characterizes under hydraulic pressure, that there is a preload in the guide bushing (2). When approaching the workpiece with this rigidly connected transverse wall (6), the centering point can therefore be arranged against the spring front is at which the centering point (15) at the end, the pre-tension is withdrawn axially, so that the knife-like detachable, is attached to the driver elements in the face of the work- 3. Voice pickup according to claim 2, characterized in that penetrate tools and a form-fitting entrainment indicates that the transverse wall (6) can generate with corre- sponding. As a result of the center point corresponding guide parts (20,21) of the driver head independent common hydraulic pressure forefes (16) interacting guide devices tension of the drive pins or pistons is between (22) has, through which the non-rotatable connection see these an automatic hydraulic pressure between the driver head (16) and the FUh-30 are the same, with the result that independent bushing (2) is made of any axial run-out errors on the face of the work- 4. Voice driver according to one of the previous pieces always a perfect engagement of the driver the claims, characterized in that it is guaranteed in the material of the workpiece
Adjusting device one with the driver head (16) This tuning driver has proven itself in practice, protruding in the guide bushing (2), slidably 35. The axial displaceability of the Zen-guided pressure plate (18), however, has a certain lateral play due to a trier tip, coupling device ( 19) for a centric attack, which for most applications is designed under the fende pull rod, is a permissible tolerance, but then avoided 5. Vocal participant according to claims 2 and 4, which must if it is on the highest concentricity of the characterized in that the pressure plate (18) 40 arrives to be machined workpiece, as this insauf the side facing away from the driver head (16) occasionally, especially in modern NC lathes Transverse wall (6) arranged and borrowed with the takeaway is the case. Merkopf (16) by means of appropriate openings. Voicers are therefore already known gene (22) of the transverse wall (6) running connection become (DE-OS 14 02 258) in which the centering elements (21,20) is rigidly connected. 45 point is held rigidly, while the driver element 6. Voicer according to claims 3 and 5, elements-bearing driving pins together hydraudsame characterized in that the connecting elements are axially adjustable in order to achieve the necessary penetration by means of coaxially arranged bolts (20) the depth of the driver elements in the centering area that also act as guiding elements. to achieve a pointed workpiece. This is 7. Voice participant according to claim 6, characterized in that 50 indicates that the voice participant only indicates one that between the driving head correct workpiece diameter can be used and (16) and the pressure plate (18) on the cylindrical that for the machining of workpieces with under-bolts (20) attached cylindrical spacer sleeves with different diameters for the engagement of the (21) are arranged, the in the openings (22) of the slave elements available end face Transverse wall (6) are guided longitudinally. 55 also different participants with corresponding 8. Voice driver according to one of claims 4 to the clamping circle diameter of different sizes 7, characterized in that the transverse wall (6) driver elements have to be kept in stock to the centering tip (15) coaxial, sen on one side so that they can be interchanged with each other cylindrical guide pin (10). carries, on which the pressure plate (18) with a corresponding 60 object of the invention is to remedy this and The corresponding bearing bore is mounted axially displaceably to create a tuning driver that allows eiist. On the one hand, the highest concentricity of the 9. To ensure that the participant takes part after one of the workpieces picked up at the previous trier tip Claims, characterized in that the first and, on the other hand, a simple adaptation to sub-driver elements (17) each on in cylinder bores 65 schitdliche conditions of use, for example underruns of the driver head (16) axially displaceable clamping circle diameters of the driver elements mounted pistons are arranged and allow with mente. cylinder bores filled with a pressure medium