EP1286794B1 - Cold rolling machine - Google Patents

Abstract

Cold rolling machine comprises two profiled rollers (2, 4) moving in opposite directions and each arranged on a guide (52, 54) over a carriage (56, 58); and an adjusting device (38, 40) having an adjustment drive (44) via which the rollers can be adjusted during the rolling process. An independent claim is also included for a process for cold rolling a workpiece using the above machine. Preferred Features: The adjusting device has a guiding carriage (38, 40) for each guide, the guiding carriage being able to move on a bevel guide (34, 36).

Description

The invention relates to a cold rolling machine according to the preamble of claim 1, in particular Roll bar suitable for such cold rolling machines and a method for cold rolling a workpiece.

In such cold rolling machines to be processed Workpiece rotatable between two tips or other Tensioning clamped, this Workpiece clamping device usually a feed axis assigned. The desired profiling of the workpiece takes place via two synchronously counter-rotating Rolling rods simultaneously on the workpiece impinge and this first by friction and later set in rotation by positive engagement. It will the material in the free spaces of the tool, d. H. of the Rolling rods displaced. Usually, the height of the ground profile of the rolling rod in the forming area too, so that each tooth of the rolling rod is slightly deeper in the Workpiece is pressed in, as the previous one. To Achieving the full tread depth can be a Kallibrierzone and a relaxation zone, along which the geometry and the surface quality of the workpiece is optimized.

This non-cutting cold forming profiles, such as Splines (straight or oblique), Spiral gears, oil grooves, threads or knurls is approx. thirty times faster than the machining the profiles. Cold rolled workpieces also offer one higher strength, better surface quality and large Accuracy.

In the brochure "special machine program XK" of the applicant is presented a cold rolling machine, in which the two counter-movable Rolling rods are arranged in the horizontal direction while the workpiece axis also in the horizontal direction transversely to the direction of movement of the rolling rods is arranged. The disadvantage of this solution is that due to the Horizontal arrangement of the rolling rods a considerable width of the cold rolling machine is required. This known machine also has one hydraulic drive whose hydraulic unit requires a lot of space.

This disadvantage is achieved by a cold rolling machine according to the Overcome WO 99/43454 A1, in which the rolling rods in the vertical direction are arranged so that the machine has a much smaller footprint requires.

For dimensional corrections on the workpiece, it may be necessary to form the predetermined profile depth of the rolling rod in the radial direction (relative on the workpiece). This delivery is done manually via adjusting screws, about the radial position of the rolling rods against the workpiece is adjustable. For this readjustment of the rolling process must be interrupted so that the productivity of the plant is reduced.

, In contrast, the invention has the object, a cold rolling machine and to provide a method of cold rolling that minimizes downtime are reduced during production.

This object is with respect to the cold rolling machine by the features of claim 1 and with regard to the method by the features of Patent claim 12 solved.

According to the invention, the cold rolling machine with a Delivery device provided with integrated feed drive, about the rolling rods during the rolling process are adjustable in the direction of engagement. That is, everyone Rolling rod is assigned to an infeed axis, which is a Adjustment of the rolling rods in approximately radial direction with Reference to the workpiece to be machined allows. By This delivery device can thus the tread depth be changed during the rolling process, so that, for example the desired final tread depth not - like required in the prior art - during a Feed movement of the rolling rods, but during several Walzstangenhüben is formed, where the rolling rods be adjusted in the radial direction. This makes it possible to minimize the length of the rolling rod, so that the dimensions of the cold rolling machine comparatively stay low.

In this Reversierbetrieb therefore the profile with formed several Walzstangenhüben while at the known machines rolled the profile with only one stroke had to be - it is obvious that the conventional Procedure a much greater burden on the Machine and the rolling rods represents.

Since the tread depth according to the invention via the feed device is determined, the rolling rods can substantially executed with consistent tread depth so that their production is much easier than in the conventional rolling rods with in the rolling direction Growing tread depth is. The initially described Calibration and relaxation zones can be over small Ramps formed at the end portions of the rolling rods be with the extending between the ramps Range of rolling rods is substantially consistent Profile depth is formed.

In a particularly preferred embodiment Each of the two rolling rods each have a guide carriage associated, which is displaceable along inclined guides is. These two inclined guides are V-shaped employed to each other, so that by moving the Guide carriage along the associated inclined guide the radial distance between roll bar and workpiece is changeable. D. h., The delivery movement is carried out by Moving the rolling rod along the wedge-shaped Angular guides, so that by adjusting the Rolling rods without tool change a variation of Number of teeth, the rolling of even and odd numbers of teeth, a positioned rolling and the quality optimization of the profile by division correction is possible.

The delivery movement can be carried out very precisely, if each guide carriage has its own feed drive, For example, associated with a planetary spindle drive is. Alternatively, other suitable Drives, such as rack drives, ball screw drives or hydraulic drives used become.

The structure of the cold rolling machine according to the invention can be further simplified if the free end sections the displaceable along the inclined guides Guide carriages are connected via a console, on stored the drives for the rolling rod device are.

The inventive concept can be particularly advantageous used in cold rolling machines whose rolling rods are driven in the vertical direction, so that the Installation surface of the machine according to the invention minimal is. The height can be achieved by driving the rolling rods minimize horizontally.

According to the invention, the workpiece can be passed over the rolling rods transferred forces or over its own Driven by the drive of the Rolling rods is synchronized.

In an advantageous variant of the invention is the forming area of the workpiece is exposed to ultrasound. This ultrasound makes the flow limit lowered during the forming process, so that the forming forces compared to conventional solutions are reduced.

The guide slides supporting the inclined guides are advantageously spaced at two Supporting legs of a machine bed supported, wherein these two support legs to increase the rigidity are connected via cross straps.

Other advantageous developments of the invention are the subject of the further subclaims.

Figur 1 eine schematische Schnittdarstellung einer erfindungsgemäßen Kaltwalzmaschine;

Figur 2 eine geschnittene Draufsicht auf die Kaltwalzmaschine aus Figur 1 und

Figur 3 eine schematische Darstellung einer Walzstange aus Figur 1.

In the following a preferred embodiment of the invention will be explained in more detail with reference to schematic drawings. Show it:

Figure 1 is a schematic sectional view of a cold rolling machine according to the invention;

Figure 2 is a sectional plan view of the cold rolling machine of Figure 1 and

FIG. 3 shows a schematic illustration of a rolling rod from FIG. 1.

FIG. 1 shows a section through a Cold rolling machine 1, in which two rolling rods 2, 4 in Vertical direction: (with reference to the footprint) are, while a workpiece, not shown carrying headstock 6 (only indicated in FIG 1) in the horizontal direction, d. H. parallel to the support surface is arranged. The workpiece is in this headstock 6 rotatably mounted, via a not shown NC drive, for example for supply or discharge of the workpiece from the machining area, before or after the rolling process, a displacement in the axial direction (perpendicular to the drawing plane) is possible. The design the headstock with a quill and a rear Centering tip is essentially different not of usual solutions, so that with regard to further Details for the sake of simplicity on the above-mentioned Prospectus of the applicant is referenced.

Leave by the cold rolling machine according to the invention a variety of profiles, such as splines, Threads, running gears, oil grooves, ring grooves, Knurls or other special shapes also in reversing operation form.

The control of the cold rolling machine 1 is shown in FIG 2 housed in laterally arranged cabinets 7. This extremely compact construction with minimal Aufstellfläche allows the cold rolling machine 1 as to execute so-called hook machine, which practically as functional unit is pre-assembled and delivered.

The illustrated cold rolling machine 1 has a mineral cast manufactured substructure, the two upwards (View of Figure 1) projecting support legs 10, 12th Has. These each have a stepped recess with a visible in Figure 1 horizontal support surface 14th and a vertical support surface (Figure 2) 16, at the one the two support legs 10, 12 overarching bridge construction 18 is supported. This is in FIG. 2 shown cut and contains essentially the Guides and drives for the reciprocal movement of the Rolling bars 2, 4.

The rolling rods 2, 4 bearing bridge construction 18 each has one attached to the support legs 10, 12 Support body 20, 22, which consists essentially of a Cast support structure 24 is made with a Mineralgußfüllung is executed.

As can be seen in particular Figure 2, the Both support body 20, 22 via a rear cross-tab 26th and a front cross-bar 28 connected together the area between the two support legs 10, 12th overstretch. The end portions of the front crossbar 28 are at the through the horizontal support surface 14 and the Vertical support surface 16 formed bearing surfaces of Support leg 10 and 12 attached. Both transverse straps 26, 28 each have a recess 30, 32, through which the workpiece with the associated clamping devices of the headstock 6 (indicated in Figure 2) in the Machining area can be feasible.

As further shown in particular FIG. 2, are at the opposite end faces of the two Support body 20, 22 and the cast-support structure 24th cast in oblique track guides 34, 36 in the form of Flat track guides made of plastic, which are due to low friction, high accuracy, long Lifespan as well as an optimal damping characteristic. Along this slanted track guides 34, 36 is in each case a guide carriage 38, 40 guided in the Investment area to the two support body 20, 22 with guide legs is executed, which is the inclined track guide 34, 36 embrace. The determination of the guide carriages 38, 40 in the transverse direction (Figure 1) via a counter-guide 42, the side surfaces of the flat track guide 36th engage behind.

As can be seen in particular from Figure 1, the both end faces of the inclined track guides 34, 36 V-shaped employed against each other, so that their distance reduced to the footprint. The angle of attack each flat track guide 34, 36 may, for example 3 °.

The axial displacement of the two guide carriages 38, 40 takes place via an NC drive 44, the for example as planetary spindle drive with servomotor 50 may be executed. Each is a spindle nut 46 rotatably supported in the support body 22 and 24, while the planetary spindle 48 in a console of Guide carriage 38 and 40 stored and a Timing belt is connected to the servo motor 50. Depending on Direction of rotation of the servo motor 50 is the planetary spindle 48 through the fixed spindle nut 46 in rotation offset and this as axial displacement on the guide carriage 38,40 transferred so that these along the Slanted track guides 34 and 36 are moved.

The removed from the inclined track guides 34, 36 End faces of the guide carriage 38, 40 extend parallel to the feed axis of the two rolling rods 2, 4, so that the guide carriage, 38, 40 in the illustration according to Figure 1 have an approximately wedge-shaped cross-section. The rolling rods 2, 4 assigning end faces the guide carriages 38, 40 are also guides 52, 54 along which slides 56, 58 are guided are on which the Wälzstangen 2, 4 attached are.

The guides 52, 54 are also again as cast Flat track guides executed and correspond in terms of construction essentially the inclined guides 34, 36. That is, the carriages 56, 58 dive along their end face in a U-shaped recess of the associated Guide carriage 38, 40, wherein these Recess is designed as a sliding guide. The determination the carriage 56, 58 on the associated Führschlgsschlitten 38, 40 takes place via a counter-guide 60.

Which in FIG. 1 shows the two support legs 10, 12 also extending end portions of the two guide carriage 38, 40 each have a console 62, in each an NC drives 64, 66 is mounted. These are handy the same structure as the drive 44 for the Guide carriage 38, 40th D. h., A planetary spindle 48th is (here via a toothed belt 68) (Figure 2) with a Servomotor 50 is connected and rotatable in the console 62nd stored. The cooperating with the planetary spindle 48 Spindle nut 46 is rotationally fixed in each case a carriage 56, 58 mounted so that upon rotation of the planetary spindle 48, the spindle nut 46 and the associated Slide 56 and 58 along the guide 52 and 54, respectively becomes. The planetary spindle 48 passes through it an inner bore of the associated carriage 56, 58. The Both NC drives 64, 66 are driven in such a way that the two rolling rods 2, 4 in the counter-synchronized Movements are offset.

Figure 3 shows a schematic representation of a Rolling rod 2, as in the cold rolling machine according to the invention 1 can be used according to FIG.

This roll bar 2 is made in a conventional manner hardened and ground cold work steel produced and carries a profiling 70 whose profile depth S substantially constant along a region T. is. At the two end portions of the profiling 70 Ramps 72 are formed whose length U is essential less than the length T with constant profiling 70 is. Due to the substantially constant Profiling can be shown in Figure 3 Rolling rod much easier than conventional rolling rods produce, where the tread depth in the range T is variable. Also, the regrinding of the in Figure 3 shown rolling rod is due to the substantially consistent tread depth much easier than at the conventional solutions.

FIG. 1 shows the basic position of the cold rolling machine 1, in which the carriage 58 in its upper and the Carriage 56 is in its lower end position. In This basic position is the two guide carriages 38, 40 via the NC drives 44 in their upper end position driven, so that the distance between the rolling rods 2, 4 is maximum (minimum tread depth). In this basic position is the workpiece over the headstock 6 in its machining position between the two rolling rods 2, 4 brought.

Subsequently, the two NC drives 64, 66 controlled synchronously and in opposite directions, so that the two Rolling bars 2, 4 run in opposite directions on the workpiece and this rotated by frictional and positive engagement in rotation, being through the engagement between the workpiece and the Both rolling rods 2, 4 of the forming process takes place. The Profile depth can be adjusted by a synchronous shift the two guide slides 38, 40 along the inclined surfaces 34, 36 are set, with the maximum Tread depth during a stroke of the rolling rods 2, 4 or during several successive strokes (also in the Reversing) is formed. By suitable inclination the inclined guide 34, 36 and corresponding stroke of NC drives can be, for example, a tread depth of make up to about 5 mm. The rolling process is constantly monitors, so that the rolling process by variable speed profiles both for the advance of the guide carriage 34, 36 and the carriage 56, 58 can be optimized is.

Through the over the bridge construction 18 with each other connected support legs 10, 12 is an extremely rigid Machine construction ensures, with the mineral casting Substructure 8 and the mineral cast-filled support body 20, 22nd a much better damping than conventional designs cause. The mineral casting base allows it to integrate all the supply elements, according to the casting of the substructure virtually no additional Editing is required.

The vertical orientation of the rolling rods 2, 4 simplified the coolant removal compared to the brochure the applicant disclosed solution considerably.

Instead of said planetary spindle drives can Of course, other suitable drives, such as For example, ball screws, rack drives or hydraulic drives are used. The substructure may differ from the above-described embodiment also in a conventional manner by a welding or cast construction be formed.

The adjustability of the guide carriage 38, 40 allows it further, during the rolling process a To perform division correction, so that the rolling quality Compared to conventional solutions with rolling rods considerably is improved. Instead of the described sliding guide Alternatively, conventional, non-plastic coated Slideways, rolling guides, for example Roller shoes or flat cage guides used which, however, both in terms of load ratings as well as the cost less favorable than the molded Guideways are.

In the embodiment described above the workpiece by engagement with the rolling rods 2, 4 driven. In an alternative variant, the Workpiece to be assigned its own rotary drive, the synchronized with the NC drives 64, 66 of the rolling rods is, so that the stroke of the rolling rods 2, 4 with the Rotation of the workpiece to be rolled is synchronized.

The forming forces can be reduced, if the rolled surface of the workpiece is subjected to ultrasound becomes. For this Ultraschallbeaufschlagung can a suitable ultrasonic head in the cold rolling machine to get integrated. Another possibility exists therein, the rotational movement of the workpiece during the Rolling process with ultrasonic vibrations to overlap. This could for example be done by the above-described rotary drive for the workpiece a rotary motion generated with high-frequency ultrasonic vibrations low amplitude is superimposed. By the Schwingungsbeinflussung the forming process can be reduce the forming forces during the rolling process, so that allows an increase in the process speed is. Due to the reduction of the flow limit can even after conventional methods difficult to form Cold rolled materials.

Disclosed is a cold rolling machine, in which the Rolling rods preferably arranged in the vertical direction are and about a feed device during the rolling process in the radial direction with respect to the machined Workpiece are adjustable.

LIST OF REFERENCE NUMBERS

1

Cold Rolling Machine

2, 4

rolling bar

6

headstock

7

switch cabinet

8th

substructure

10, 12

support legs

14

Horizontal support surface

16

Vertical support surface

18

bridge construction

20, 22

support body

24

Cast supporting structure

26

rear cross-strap

28

front cross strap

30, 32

recesses

34, 36

inclined guides

38, 40

guide carriage

42

counter-guide

44

NC drive

46

spindle nut

48

planetary spindle

50

servomotor

52, 54

guides

56, 58

carriage

60

clamping bodies

62

console

64, 66

NC drives

68

toothed belt

70

profiling

72

ramp

Claims (15)

1. A cold rolling machine comprising two profiled rolling racks (2, 4) which are driven in opposite directions and each of which is mounted on a guide (52, 54) by means of a slide (56, 58) and engages with a work-piece that is mounted in rotatable manner between the rolling racks (2, 4), characterized by a feeding device (38, 40; 20, 22) including at least one feed drive (44) with the aid of which the rolling racks (2, 4) are adjustable in a radial direction with respect to the work-piece during the rolling operation.
2. A cold rolling machine in accordance with Claim 1, wherein said feeding device includes for each guide (52, 54) a guide block (38, 40) which is mounted in displaceable manner on an inclined guide (34, 36), wherein the inclined guides (34, 36) associated with the two rolling racks (2, 4) are set in a V-shape relative to one another.
3. A cold rolling machine in accordance with Claim 2 or 3, wherein a feed drive (44), preferably an NC drive, is associated with each guide block (38, 40).
4. A cold rolling machine in accordance with any of the Claims 2 to 3, wherein the free end portions of the guide blocks (38, 40) have a bracket (62) upon which the drives (64, 66) for the rolling racks (2, 4) are mounted.
5. A cold rolling machine in accordance with any of the preceding Claims, wherein the guides (52, 54) for the rolling racks (2, 4) are arranged in the vertical direction or in a horizontal direction.
6. A cold rolling machine in accordance with Claim 2, wherein the inclined guides (34, 36) are arranged on two supporting legs (10, 12) of a substructure (8).
7. A cold rolling machine in accordance with Claim 6, wherein the two supporting legs (10, 12) are interconnected by means of transverse fishplates (26, 28).
8. A cold rolling machine in accordance with any of the Claims 1 to 7, wherein a drive which is synchronized with the drives for the rolling racks is associated with the work-piece.
9. A cold rolling machine in accordance with any of the Claims 1 to 8, comprising an ultrasonic device by means of which vibrations in the ultrasonic range are adapted to be applied to the rolled area of the work-piece.
10. A cold rolling machine in accordance with any of the preceding Claims, characterized in that there is provided a rolling rack (2; 4) having a profiling (70) that extends with a constant profile over substantially the entire operative surface of the rolling rack (2; 4).
11. A cold rolling machine in accordance with Claim 10, wherein short ramps (72) having a smaller profile depth are formed at the end portions of the profiling (70).
12. A method of cold rolling a work-piece which is in effective engagement with two rolling racks (2, 4) that are adapted to be driven in opposite directions, characterized in that the rolling racks (2, 4) are adjusted during the rolling operation in a radial direction with respect to the work-piece.
13. A method in accordance with Claim 12, wherein the predetermined profile depth is formed during a plurality of successive strokes of the rolling racks.
14. The use of a cold rolling machine in accordance with any of the Claims 1 to 11, comprising rolling racks having a profiling (70) that extends with a constant profile over substantially the entire operative surface of the rolling rack (2; 4).
15. A method in accordance with Claim 14, wherein short ramps (72) having a smaller profile depth are formed at the end portions of the profiling (70) of the rolling racks.

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