EP0235212A1

EP0235212A1 - Lathe device for guiding or clamping bar material

Info

Publication number: EP0235212A1
Application number: EP86905202A
Authority: EP
Inventors: Hans Jens
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-08-30
Filing date: 1986-08-26
Publication date: 1987-09-09
Also published as: DE3531011A1; WO1987001318A1

Abstract

Ce dispositif est constitué d'un élément de fixation (1) doté d'un passage axial (5) pour les barres (6), dans lequel au moins une partie extrême de l'élément de fixation est séparée par des fentes axiales en plusieurs segments (2) pouvant se déplacer radialement, et dans lequel cette partie extrême est pourvue d'une surface conique tronquée extérieure qui coopère avec une surface conique tronquée intérieure (7 et 8) pour la compression radiale des segments par la force axiale, d'un logement fixe (20) dans lequel l'élément de fixation (17) est supporté de manière rotative, et d'un élément de transmission axial (26) déplaçable au moins axialement pour transmettre une force d'entraînement à l'élément de fixation (1) pour régler les segments (2) dans le sens radial. Un système motorisé (28, 34, 35) est prévu pour l'entraînement de l'éément de transmission (26).This device consists of a fixing element (1) provided with an axial passage (5) for the bars (6), in which at least one end part of the fixing element is separated by axial slots into several segments (2) which can move radially, and in which this end part is provided with an outer truncated conical surface which cooperates with an inner truncated conical surface (7 and 8) for the radial compression of the segments by the axial force, a fixed housing (20) in which the fixing element (17) is rotatably supported, and an axial transmission element (26) movable at least axially to transmit a driving force to the fixing element (1) to adjust the segments (2) radially. A motorized system (28, 34, 35) is provided for driving the transmission element (26).

Description

Device for lathes for guiding or tensioning bar stock

The invention relates to a device for lathes for guiding or tensioning rod material, consisting of an elongate receiving body with an axial passage for the rod material, at least one end section of the receiving body being divided into a plurality of radially movable segment parts by axial slitting, and the latter End section with an outer conical surface tapering towards the end of the receiving body and cooperating with an inner truncated cone surface for radially compressing the segment parts due to a

Axial force is provided, from a fixed housing, in which the receiving body is rotatably mounted, and from an at least axially movable actuator for transmitting an actuating force to the receiving body in order to adjust its segment parts radially.

In known devices of this type, the actuator designed as an adjusting sleeve or the like is preferably axially adjustable in order to exert an axial force on the receiving body via an interposed pressure part, so that its segment parts onto the desired inner working diameter can be set (DE-Al-29 03 915, DE-Ul-81 35 511). If one or more length sections of the rod material held in the set receiving body have been turned off, the rod material must be advanced again by a feed movement in order to be able to twist off new length sections. For this purpose, the entire inner working diameter of the receiving body is not changed if the pliers are so that

10. The rod material has to be pushed through the set, close clearance between the receiving body and the rod material, which is correspondingly careful due to the resulting relatively high frictional resistance between these two parts

15 r. and must therefore take place relatively slowly, or the working diameter of the receiving body is loosened for the purpose of pushing the rod material forward, if it is a collet whose segment parts fix the rod material during the

Hold on to the seat, and then re-adjust which loosening or readjustment is carried out by manual control.

By slowly pushing the bar material or 5 by the mentioned manual operation, the

Ersafebfatt times when positioning a new length section of the bar material in the receiving body is considerable, which leads to correspondingly high production times and production costs. Furthermore, the manual operation mentioned is also cumbersome and can only be carried out when the work spindle of the lathe has come to a standstill.

he object of the invention 'is to improve a device of the type initially mentioned da¬ executed basis that a faster advancing ^or' a time-truncated repositioning is provided to the bearbei¬ Tenden rod material.

The solution to the problem is based on the specified device and is characterized in that a power drive device for adjusting the actuator is connected to the actuator.

In a preferred embodiment of the device according to the invention, the power drive device comprises a piston-cylinder unit which is oriented perpendicularly to the pressure direction of the actuator and which acts directly or indirectly on the actuator and is further designed such that an axial movement of the actuator is brought about. - ä. -

For the latter, the power drive device includes a ring part which is operatively connected to the sleeve-shaped actuator and a lever arrangement which on the one hand rigidly engages the ring part and on the other hand is articulated on the piston rod of the piston-cylinder unit. The angular position of the ring part relative to the actuator about its axis of rotation is preferably adjustable, e.g. by forming the ring part as a clamping ring.

With this solution, the production times and consequently also the production costs are considerably reduced because the idle times that occur when the rod material is advanced or repositioned are significantly reduced. This is due on the one hand to the use of the quickly actuatable power drive device for setting the internal working diameter of the receiving body and, on the other hand, to the oversized setting of the internal working diameter mentioned, which can be carried out quickly, for the easier, i.e. greatly reduced displacement of the rod material to be positioned in the receiving body. The latter, in particular, is very advantageous when using the receiving body as guide pliers, since the surface of the rod material which is usually finished is protected.

Spare sheet The invention is explained in more detail below with reference to exemplary embodiments shown in the accompanying drawings. Show it:

1 shows a partially sectioned side view according to line I-I in FIG. 2, FIG. 2 shows an end view,

3 shows a modified embodiment of the object according to FIG. 1 in an enlarged end view, FIG. 4 shows the exemplary embodiment in axial section using the object according to FIGS. 1 to 3,

FIG. 5 shows an end view according to arrow A in FIG. 4,

Figure 6 shows another embodiment in partial and axial section. According to FIGS. 1 and 2, the device comprises a tubular, open-ended receptacle body 1, which is preferably completely axially severed several times over its entire length, so that several completely separate segment parts 2 are formed, which are circular around a central and common axis of rotation 3 are arranged around. By means of elastic spacer elements 11; 14, the segment parts 2 are kept at a distance from one another, as a result of which continuous gaps 4 are formed between the segment parts. By creating completely separate Ξsegment

Spare sheet parts 2, a relatively large radial adjustment range is created in the receiving body 1, which can reach about 4 mm.

In their area facing the axis of rotation 3, the segment parts 2 delimit a material passage 5 through which the rod material 6 to be machined extends (FIG. 3). In the case shown, the passage 5 is circular in cross section in order to be able to accommodate round material. Alternatively, however, it is also possible for the passage to have a different cross-sectional profile, e.g. a polygonal profile.

The body 1 formed by the segment parts 2 preferably has a conical surface 7 and 8 at each of its two ends, which come into contact in the usual manner against corresponding counter cone surfaces (FIG. 4) when the segment parts are adjusted in the radial direction. The cone frustum surfaces 7 and 8 narrow towards the ends of the body 1. The tapering is carried out in such a way that the acute angle alpha of each conical frustum surface is preferably in a range from 30 ° to 60 °. In this way, a very fine and reliable radial adjustment of the segment parts 2 is achieved.

etching sheet The special surface areas 9 of each conical frustum surface 7, 8 adjoining the column 4 are formed by removing material, namely along the entire axial length of the conical frustum surfaces, so that each surface in this area is smaller in diameter than in the rest of its area . The surface areas 9 mentioned are produced in a simple manner by flat flat surfaces. This design of the truncated cone surfaces also improves the radial adjustability of the segment parts 2.

The inner surfaces 10 of the segment parts 2, which delimit the gaps 4, are recessed to accommodate the elastic, e.g. rubber spacers 11 to give a good grip. Furthermore shows

Figure 1 that each inner surface 10 has two axially spaced recesses 12 which are formed by bores extending radially from the outside to the axis of rotation 3 of the body 1, each bore by removing material from one segment part and material from the other segment part is formed. As a result, the cutouts 12 of one segment part lie exactly opposite the cutouts 12 of the other segment part, so that each of the opposite cutouts together has an elastic distance. record element.

Alternatively, according to FIG. 3, the inner surfaces 10 can also be provided with bores 13 which extend perpendicular to these surfaces. In this case too, two bores 13 are arranged at a distance from one another on each inner surface 10, the bores of one segment of the segment being coaxially opposite the bores of the other segment part. In this case, helical metal springs 14 are preferably provided as elastic elements, with two mutually opposite bores each receiving a spring 14 together.

On its cylindrical outer surface, for example in the region of its axial center, the receiving body 1 is provided with a circumferential groove 15 which engages in all three segment parts 2. In this circumferential groove 15 there is an elastic ring element 16, which can be made of rubber, for example, and holds the three segment parts together. This makes it possible for the elastic spacer elements 11; 14, which keep the segment parts 2 at a distance, are loosely held in the cutouts 12 or bores 13. According to FIG. 4, the receiving body 1 is held in a rotating bushing 17 which is rotatably mounted in a housing 20 by means of two roller bearings 18 and 19. The housing 20 is fixed in a conventional manner on a lathe 21, for example by a ring nut 27. The radial working setting of the passage 5 of the receiving body 1 is carried out in the following manner. For this purpose, a sleeve-shaped pressure part 22 is used, which in this case presses with its inner cone 23 against the one conical surface 8 of the body 1, while the other conical surface 7 of the body 1 bears against an axially stationary counter-conical surface of the surrounding bush 17. On the other hand, the pressure part 22 bears against an axial roller bearing 24, against which in turn resilient means 25, for example a set of disc springs, press. A, for example, sleeve-shaped actuator 26 presses against the disc springs and in turn engages with the fixed housing 20 via a threaded connection.

The actuator 26 is also provided with a power drive device 28, e.g. connected to a piston-cylinder unit, in such a way that the actuator is rotated about the longitudinal axis 3 of the receiving body 1 in order to engage the latter in the radial direction via the pressure part 22

Spare sheet to be able to make, that is, the inside diameter is enlarged and reduced in order to hold the rod material 6.

In the example shown, the device 28 is connected indirectly to the actuator 26, specifically via a lever arrangement 29 and a ring part 30, the latter being a clamping ring which is seated on a peripheral surface of the actuator 26 (FIG. 4). The ring part 30, or alternatively a disk part or another comparable component, can also be connected to the actuator by means of a toothing, in such a way that the ring part and the actuator can be adjusted to one another about the longitudinal axis 3 of the receiving body 1 in small angular sections. The clamping ring 30 rigidly attached at 31 in the usual manner by means of a screw (not shown) allows its stepless adjustment on the actuator 26.

However, the power drive unit 28 can also act directly on the actuator 26 or on the ring part 30 or the like.

The inner end of the actuator 26 can also have an inner, axially adjustable or non-axial be provided adjustable cam member 32, for example ring with a threaded ring or with a conventional fuse ^¬. The driver part comes to bear against a shoulder of the pressure part 22 in order to move the pressure part axially back if necessary, if the force of the spacer elements 11, 14 of the receiving body 1 should not be sufficient when the device 28 is released.

The piston-cylinder unit 28 effects the axial adjustment of the actuator 26 by rotating the actuator. In an alternative embodiment, the piston-cylinder unit can also be integrated in the device and only adjust the actuator axially, as shown in FIG. 6.

In this example, a sleeve-shaped actuator 33, which coaxially surrounds the rear section of the pressure part 22, is only axially movable. This actuator carries on its outer circumference approximately in the middle a piston 34 which extends in a ring around the actuator and protrudes radially outward. The piston 34 can form an integral component with the actuator, but can also be attached to it as a separate part. Actuator 33 and piston 34 are coaxially surrounded by a cylinder 35 such that

Spare sheet An annular space 36 and 37 to be supplied with pressure fluid is formed on each side of the piston, each annular space being supplied via its inlet 38 and 39, respectively. In the case shown, the cylinder is fastened by means of an end flange 35a to a threaded ring 40, for example by means of screws, which in turn is screwed onto the housing 2 and secured to it at 41 by means of a screw. At its other end, the cylinder 35 is closed off by a separate cover 35b. In this case, the through bores 42 and 43 of the end walls of the cylinder serve as bearing points for the actuator 33. If the piston 34 is acted upon via the inlet 38, the actuator 33 moves according to the arrow 44 and closes the receiving body 1 the other inlet 39 opens the receiving body.

Claims

1. Device for lathes for guiding or tensioning bar material, consisting of an elongate receiving body with an axial passage for the bar material, wherein at least one end section of the receiving body is divided into a plurality of radially movable segment parts by axial slitting and the latter End section is provided with an outer conical surface, which tapers towards the end of the receiving body and cooperates with an inner conical surface for radially compressing the segment parts due to an axial force, from a fixed housing in which the accommodating body is rotatably mounted , and from an at least axially movable actuator for transmitting an actuating force to the receiving body in order to adjust its segment parts radially, characterized in that power actuating device (28; 34, 35) is provided for actuating the actuator (26; 33).

2. Apparatus according to claim 1, characterized in that the power drive device (28) is perpendicular to

Spare sheet Compressing direction of the actuator (26) aligned piston-cylinder unit, which acts directly or indirectly on the actuator, and is further designed such that an axial movement of the actuator is effected,

3. Apparatus according to claim 2, characterized in that the power drive device (28) includes a ring part (30) which is operatively connected to the sleeve-shaped actuator (26), and includes a lever arrangement (29) which on the one hand rigidly on the Ring part (30) engages and on the other hand is articulated on the piston rod of the piston-cylinder unit.

4. The device according to claim 3, characterized in that the ring member (30) with the actuator (26) is rigidly connected such that the angular position of the ring member about the longitudinal axis (3) of the actuator can be selected.

5. The device according to claim 4, characterized in that the ring part (30) consists of an adjustable clamping ring be¬ which can be fastened by a clamping effect on a peripheral surface of the actuator (26).

6. The device according to claim 2, characterized in that the actuator (26) is additionally rotatable.

Apparatus according to claim 1, characterized in that the power drive device comprises a piston-cylinder unit acting coaxially in the pressure direction of the actuator and that this unit consists of an axially movable sleeve-shaped part as an actuator (33) with a piston (34) on it Outside circumference and consists of a stationary cylinder (35) for fluidic pressure medium, which coaxially surrounds the piston and the actuator and is fastened to the rest of the device.

8. The device according to claim 7, characterized in that the piston (34) is provided in the form of a ring around the actuator (33) extending, pressurized fluid on both sides part and preferably forms an integral component with the actuator.

9. The device according to claim 7, characterized in that through holes (42, 43) in the two end walls (35a, b) of the cylinder (35) are provided, which form bearing points for the actuator (33).

Spare sheet