DE102009038813B4 - Device for chipless machining of elongate workpieces - Google Patents

Abstract

Device for chipless machining of elongate workpieces for producing a thread-like outer profile by means of at least one forming roll arrangement (9, 10, 11), which at least two, in each case about axes (12 ', 13', 14 ') of axle bolts (17) rotatable, each shape profiles ( 12 '', 13 '', 14 '') carrying forming rollers, wherein the forming roller assembly (9, 10, 11) surrounds the workpiece to be machined, wherein a feed movement between the forming rollers (12, 13, 14) and the workpiece in the The forming rollers (12, 13, 14) of each forming roll assembly (9, 10, 11) successively engage with the workpiece during one complete revolution around the workpiece, and wherein the axial position of each Forming roller (12, 13, 14) within an axial installation dimension (28) on the axle bolt (17) can be fixed, characterized in that the forming rollers (12, 13, 14) of a molding roll arrangement with each other have the same shape profiles (12 '', 13 '', 14 ''), and that for the representation of successive Umformeingriffen in the direction of circulation around the workpiece ...

Description

The invention relates to a device according to the preamble of claim 1.

The quasi-continuous production of rock anchors, boring bars and other comparable products starting from rod-shaped or tubular bodies by chipless machining in a rolling process in known per se and it is such a device, for example in the document DE 43 13 918 described. The mold used in this apparatus consists of a rolling head, in which three, molded in the peripheral region forming rollers are mounted, whose axes are arranged distributed at an angle to the axis of the outside thread-like reshaped body, uniformly distributed around this. To carry out the forming process, the rolling head is driven about its axis extending coaxially to the axis of the base body, so that results from the angular position of the forming rollers of the axial feed of the non-rotatably held about its axis body.

In the document DE 101 19 569 A1 a comparable device is described in which a rolling head is used, which - seen in the direction of passage - several arrangements consisting of at least three molding rolls, their profiles differ and are adapted to the progressive in this direction forming process. Each of the forming rollers has a ring-like, stepless outer profile, wherein an axial feed in accordance with the rotation of the rolling head around which is coaxial with the workpiece axis extending central axis given by an angular adjustment relative to the axis of the non-rotatable workpiece.

In the document DE 10 2007 029 548 B3 is a specific for use in such a device rolling head, in particular the storage of the forming rollers described. The rolling head consists of a rotatably mounted about a central axis, connected to a drive arrangement of a plurality of axially spaced-apart bearing discs, between which there is a respective arrangement of forming rollers. The forming rollers are freely rotatably mounted about their respective axes, which are set at an angle to the longitudinal axis of the rod or tubular workpiece to be machined. The workpiece extends coaxially with the central axis of the rolling head through central openings of the bearing discs and is at its two Ends clamped unrotatably. The profiles of the successive forming roll arrangements are slightly different, taking into account the fact that in that direction the forming rolls successively engage with the work piece. For the storage of the forming rollers serve axle, the ends of which are fixedly arranged in the bearing discs. On the axle pin, the forming roller is supported via a central radial bearing and with intermediate arrangement of spacer rings via thrust bearings on the bearing discs. The mutual spacers have different axial dimensions, so that the position of the forming roller is changeable on the axle bolt changeable with unchanged axial installation dimension by merely interchanging the input and output side spacers, so that in a one-sided wear of the axle bolt the worn area in a less highly stressed zone passes, so that an improved material utilization of the axle bolt is given.

In order to ensure in these known rolling heads that in each forming roller assembly a forming engagement with the workpiece is set up so that their forming rollers seen in the direction of rotation of the rolling head successively engage, forming rollers are used with mutually different shape profiles. However, the forming rollers are exposed to a not inconsiderable wear, so that the operator of these devices must hold a corresponding number of different form rollers in readiness. Accordingly, the number of forming rolls of a forming roll assembly and the number of forming roll assemblies of such a device increases the required stock of forming rolls.

It is the object of the invention to provide a device of the type described at the beginning with simple means with a view to a more rational operation.

This object is achieved in such a device by the features of the characterizing part of claim 1.

It is essential to the invention hereinbelow that, unlike the prior art mentioned above, successive forming engagements of shaping rolls following one another in the direction of rotation can be represented by varying or changing the axial position of the forming roll or of the forming profile within the constructively specified installation dimension. This means that only one mold profile must be kept in readiness for the operation of the mold roller assembly, so that there is a considerable saving in ready-to-hold mold profiles or forming rollers.

The features of claims 2 and 3 are directed to different types of structural design of the forming roll assembly. For this purpose, for example, a rolling head can be provided, in which the individual forming rollers are freely rotatably mounted about their respective axis, wherein the rolling head is rotationally drivable as a structural unit about its axis. Alternatively, as part of a forming roll arrangement, each forming roll can also be driven directly about its axis.

The axes of the forming rollers are employed according to the features of claims 4 and 5 with respect to the axis of the workpiece by an angle. In conjunction with a pitchless groove-like shape profile results from this angle, the pitch of the thread-like, to be introduced into the outside of the workpiece deformation and at the same time the feed, which is applied to the non-rotatably clamped workpiece during machining about its axis.

The features of claim 6 are directed to a constructive specification of the axial adjustability of a molding profile of a molding roll. For this purpose, on both sides of the mold profile in each case at least one adjusting disk whose two axial lengths are completed with the length of the mold profile to said mounting dimension. Both adjusting discs will thus generally have a different axial dimension in accordance with the axial position of the mold profile to be adjusted. This means that, in contrast to the prior art set forth at the outset, in addition to a standard shape of a shaped profile, only adjusting disks of different dimensions must be kept in readiness in order to replace worn parts if necessary. This applies in any case for all forming rolls of a forming roll arrangement.

The features of claims 7 and 8 are directed to a further structural design of a molding roll, in particular their storage within the rolling head. In each case, the axle bearing the forming roller is non-rotatably received in the rolling head, being used to represent the said mounting dimension documenting reference or contact surfaces such components that are present anyway, for example, such components that determine the axle bolt within the rolling head serve. To represent reproducible conditions, it is advantageous if all the functional elements intended for supporting the molded profile are included in its structure, so that the opposing end faces of the shaped profile can always be used as a contact surface for the adjusting disks.

According to the features of claim 9, a device according to the invention usually comprises more than just a forming roll arrangement, so that the entire forming work is applied stepwise. According to the progressive in the direction of passage of the workpiece forming differ in the radial dimensions of a molding rolls used the forming rolls, but not their profile shapes.

The invention will be explained in more detail below with reference to the embodiment shown in the drawings. Show it:

1 a side view of a rolling head according to the invention;

2 a view of a molding roll as part of the rolling head according to 1 in enlarged partial view;

3 an exploded view of a single forming roll of the rolling head according to 1 ,

With 1 . 2 . 3 . 4 are in 1 four mutually identical circular, parallel and coaxial with each other extending bearing discs referred to by spacers 5 are held in accordance with uniform distances from each other in their shown mounting position. The spacers 5 are about the circumference of the bearing discs 5 uniformly distributed and can be screwed with these.

The so-designed rolling head 6 is intended for storage in a machine frame not shown in the drawing and in this around its axis 7 rotatable drivable.

All bearing washers 1 to 4 are in a central area aligned with each other, coaxial with the axis 7 provided extending circular recesses through which in the operational use of the rolling head 6 extends in the peripheral region for the purpose of producing a thread-like deformation to be machined graphically not shown elongated rod or tubular workpiece. This coaxial with the axis 7 held workpiece is in a conventional manner during processing by means of the rolling head 6 Non-rotatable about its axis, but movably mounted in the direction of its axis.

The rolling head shown 6 is through three, in pass direction 6 of the workpiece, successive forming roll arrangements 9 . 10 . 11 characterized, each of which three circumferentially uniformly distributed forming rollers 12 . 13 . 14 only one of which is shown for reasons of graphic simplicity.

The form rollers 12 . 13 . 14 , namely their ring-cylinder-like shape profiles 12 '' . 13 '' . 14 '' are about their respective axes 12 ' . 13 ' . 14 ' freely rotatably mounted, which axes at an angle to the axis 7 of the rolling head 6 are employed. By this angular position is in connection with the rotational movement of the rolling head 6 as well as the non-rotatable but slidable in the axial direction recording of the workpiece, the pitch of the thread-like deformation and acting on this during machining axial feed can be displayed.

The form rollers 12 . 13 . 14 each molding roll assembly 9 . 10 . 11 differ with respect to the positioning on their respective axes, this positioning depending on the direction of rotation of the rolling head 6 is arranged such that the circumferentially successive forming rollers of a forming roller assembly successively engage with the workpiece.

The form rollers 12 . 13 . 14 the successive forming roll arrangements 9 . 10 . 11 differ in their radial dimensions in that they according to the in the direction of passage 8th increasing transformation.

The drawing figure 1 shows only by way of example three forming roll arrangements. In practice, a rolling head may also be formed by two or more than three molding roll assemblies following one another in a passage direction.

To explain the storage of the individual forming rolls of a forming roll arrangement will be further supplemented to the drawing figures 2 and 3 Reference is made, in which like functional elements are designated in the same way.

The 2 and 3 show the shape profile 12 '' the forming roll 12 as a ring-cylindrical, on the outside a profile in the form of an arrangement of stepless rings having basic body, the front side on both sides with mutually equally sized grooves 15 is provided. This ring profile is intended for producing an at least approximately round thread on the workpiece and to be considered only as an example. Other thread-like deformations can be made at the same profile of the molding roll alike.

With 16 is a radial bearing, z. B. a cylindrical roller bearing or a system of dowels, over which the shape profile 12 '' radially on a axle bolt 17 is supported.

With 18 Spacers are designated, over which the shape profile 12 '' on both sides on a thrust bearing 19 is supported, each with a spacer 18 and a thrust bearing 19 a turn 15 fill axially flush.

With 20 . 21 are called sleeves, for non-rotatable insertion in holes 22 . 23 two axially opposite bearing washers 1 . 2 It determines which holes are in the direction of the axis 13 ' the forming roll 12 extend in their installed state. In these thimbles 20 . 21 are the mutually equal end sections 24 . 25 of the axle bolt 17 insertable and non-rotatably fixable. This Unverdrehbarkeit can be represented, for example, form fit via tongue and groove interventions.

With 26 . 27 finally two adjustment discs are designated, over which the two thrust bearings 19 on the facing end faces of the sleeves 20 . 21 are axially supported. The between the mutually facing end faces of the sleeves 20 . 21 existing axial installation dimension 28 is identical for all three mounting positions of the forming roller assembly 9 , It is also preferably identical for all installation positions of the rolling head 6 ,

According to the invention are now the Justierscheiben 26 . 27 on both sides of a molding roll 12 chosen with the proviso that while maintaining the installation dimension 28 the axial positions of the mold profiles 12 '' . 13 '' . 14 '' the forming rollers 12 . 13 . 14 the forming roll assembly 9 . 10 . 11 on the respective axle bolt 17 are applied differently, with the aim during a machining passage in the direction of rotation of the rolling head 6 in succession in a forming roll assembly successive shape profiles to bring into engagement with the workpiece. This requires only that corresponding pairings or combinations of Justierscheiben 26 . 27 be kept in readiness, in conjunction with the axial dimensions of the molding roll to represent the installation dimension 28 are suitable.

For all installation positions of at least one molding roll arrangement 9 Thus, the same form rollers can be used, namely, regardless of their concrete installation position.

There are numerous other constructive embodiments conceivable. Thus, the individual shape profiles, seen in an axial section, for reasons of wear have a convex or conical profile.

In the case of wear, the shape profiles of a forming roll arrangement can also be exchanged with those of a forming roll arrangement arranged upstream in the direction of passage, in accordance with the absolute dimensions, in order to achieve improved material utilization. This means that only one type of shape profile is needed for the entire device. Another advantage is in this case, the simple axial adjustability of the mold profile on each supporting axle.

LIST OF REFERENCE NUMBERS

1

bearing disk

2

bearing disk

3

bearing disk

4

bearing disk

5

spacer

6

roller head

7

axis

8th

Throughput direction

9

Forming roll arrangement

10

Forming roll arrangement

11

Forming roll arrangement

12

forming roll

13

forming roll

14

forming roll

12 '

axis

13 '

axis

14 '

axis

12 ''

profile form

13 ''

profile form

14 ''

profile form

15

recess

16

radial bearings

17

axle

18

spacer

19

thrust

20

sleeve

21

sleeve

22

drilling

23

drilling

24

end

25

end

26

adjustment disc

27

adjustment disc

28

dimension

Claims (9)

Device for chipless machining of elongate workpieces for producing a thread-like outer profile by means of at least one molding roll arrangement ( 9 . 10 . 11 ), which are at least two, each about axes ( 12 ' . 13 ' . 14 ' ) of axle bolts ( 17 ) rotatable, each shaped profiles ( 12 '' . 13 '' . 14 '' ) carrying forming rollers, wherein the forming roller assembly ( 9 . 10 . 11 ) surrounds the workpiece to be machined, wherein a feed movement between the forming rollers ( 12 . 13 . 14 ) and the workpiece in its circumferential direction and is arranged axially thereto, wherein the forming rollers ( 12 . 13 . 14 ) of each molding roll assembly ( 9 . 10 . 11 ) in one complete revolution around the workpiece successively with this in a forming engagement, and wherein the axial position of each molding roll ( 12 . 13 . 14 ) within an axial installation dimension ( 28 ) on the axle ( 17 ), characterized in that the forming rollers ( 12 . 13 . 14 ) a molding roll arrangement with each other equal shape profiles ( 12 '' . 13 '' . 14 '' ), and in that the axial position of each shaping roller (14) is shown in relation to the deformation of the workpiece in the direction of rotation around the workpiece. 12 . 13 . 14 ) within the axial installation dimension ( 28 ) is set up differently. Apparatus according to claim 1, characterized in that the molding roll arrangement ( 9 . 10 . 11 ) of a about its central axis extending during machining coaxial with the workpiece ( 7 ) rotatable drivable rolling head ( 6 ), in which the forming rollers ( 12 . 13 . 14 ) on the axle bolts ( 17 ) are freely rotatably mounted. Apparatus according to claim 1, characterized in that the forming rollers of the forming roller assembly are rotatably driven drivable about their axes. Device according to one of claims 1 to 3, characterized in that the axes ( 12 ' . 13 ' . 14 ' ) of the forming rollers ( 12 . 13 . 14 ) are set at an angle to a longitudinal axis of the workpiece. Device according to claim 4, characterized in that said angle is adjustable. Device according to one of claims 2 or 4, 5, characterized in that the axle bolts ( 17 ) in the rolling head ( 6 ) about their respective axis ( 12 ' . 13 ' . 14 ' ) are fixed non-rotatably and that the mounting dimension ( 28 ) by adjusting discs ( 26 . 27 ) on both sides of a profile ( 12 '' . 13 '' . 14 '' ) of the molding roll ( 12 . 13 . 14 ) is shown. Device according to one of claims 1, 2 or 4 to 6, characterized in that the shape profile ( 12 '' . 13 '' . 14 '' ) of each molding roll ( 12 . 13 . 14 ) in a central region radially on the axle ( 17 ) and is axially mounted at both end-side end portions. Device according to one of Claims 6, 7, characterized in that the installation dimension ( 28 ) by the axial distance of the reference surfaces of for fixing the axle bolt ( 17 ) in the rolling head ( 6 ) used components is shown and that on the adjusting discs ( 26 . 27 ) An axial support of the mold profile is set up on said components. Device according to one of claims 1 to 8, characterized by several, in Passage direction ( 8th ) of a workpiece axially successive Formwalzenanordnungen ( 9 . 10 . 11 ).

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