EP2994254A1

EP2994254A1 - Method and device for rolling threads with rolling rolls

Info

Publication number: EP2994254A1
Application number: EP14724302.6A
Authority: EP
Inventors: Josef Streicher; Libor SCHWEDA
Original assignee: Streicher Josef
Current assignee: Streicher Josef
Priority date: 2013-05-08
Filing date: 2014-04-26
Publication date: 2016-03-16
Anticipated expiration: 2034-04-26
Also published as: DE102013007906A1; WO2014180540A1; EP2994254B1; DE102013007906B4

Abstract

A method for rolling threads on workpieces (26) by means of opposing and co-rotationally driven rolling rolls (3, 13) in a forming process, comprising a rolling gap (43), which forms between the rolling rolls (3, 13) and in which the workpiece (26) that is intended to undergo the forming operation is provided on its outer circumference with a thread or a thread-like profile by undergoing forming by a rolling thread (17, 27) on the rolls, wherein, in a first method step, at least one rolling roll (3) performs a linear movement in order to open the rolling gap (43), and wherein, in a second method step, the rolled stock (26) that is intended to undergo the forming operation is transported into this opened rolling gap (43), wherein, in a third method step, the rolling gap (43) narrows, and so the rolling thread (17, 27) of the mutually opposing rolling rolls (3, 13) lies against the outer circumference of the rolled stock (26) with a forming effect, and wherein, in the next method step, the rolling gap (43) is opened again and the rolled stock (26) on which rolling has been completed is transported out of the rolling gap (43). The invention also relates to a device for rolling threads.

Description

Method and device for thread rolling with rolling rolls

The invention relates to a method and a device for thread rolling with rolling rolls according to the preamble of claim 1.

Such a device has become known, for example, with the subject matter of DE 10 2008 027 964 A1. In the rolling machine shown there, workpieces are rolled in the hot forming process, because the oppositely arranged rollers form a gap between them, in which the workpiece to be formed is provided at its outer periphery with a thread or a thread-like profile.

Disadvantage of said arrangement, however, is that the two forming rollers are mounted centrally rotatable, and do not perform a wobble during the rolling process.

In the subject matter of DE 10 2008 027 964 A1, barware is moved in the longitudinal direction of the bar stock by being conveyed between the nip of the opposed and oppositely driven rolling rolls. Therefore arise in this document is not the problems that arise in the piecemeal introduction of rolling stock in the nip, namely those which occur when the rolling stock only briefly dwells in the nip to attach a profile thread on the outer circumference of the rolling stock and then the piecewise supplied rolling again from the Rolling gap is led out. The cited document does not deal with this problem of synchronized feed and discharge.

Accordingly, the invention has the object, a method and an apparatus for thread rolling with rolling rolls for piece-by-piece rolling develop so that controlled at high production capacity piecewise rolling, rolled and controlled can be removed. To solve the problem, the invention is characterized by a method according to the technical teaching of claim 1.

An essential feature of the invention is that in a first process step, at least one rolling roller performs a lifting movement to open the nip, and that in a second process step in this open nip the rolled material to be formed is conveyed in that narrows in a third process step, the roll gap , so that the rolling thread on the opposite rolling rolls reshaping abuts the outer circumference of the rolling stock, and that in the next step, the roll gap opens again and the finished rolled stock is removed from the roll gap.

Important in the invention is therefore a synchronized supply of a feeder, which is formed in the present case as a parts basket, which performs an opposite or same direction of rotation to a roll and this ensures that always synchronized a rolling stock as a cut piece, for example in shape a screw, is introduced into the now extended nip, that then the opposite roller performs a Exzenterhub that narrows the nip for the purpose of forming, and in this case the rolling is formed on the outer circumference, and that after narrowing of the nip the Exzenterhub is designed in that the roll gap widens again and thus the finished rolled stock can be removed again from the roll gap.

The device used for this purpose is thus characterized in that the one roller is mounted centrally and is driven in rotation, and coaxially on the axis of rotation a feeder is arranged with a parts basket, which synchronized in the piece gap rolling stock leads into the nip and discharges from there again. In a preferred first embodiment, it is provided that the feeding device is driven opposite to the direction of rotation of the central rolling roller and is synchronized with the direction of rotation of this rolling roller.

In another embodiment, however, it may be provided that the supply device rotates in the same direction of rotation as comparatively the centrally mounted roller, so that the two embodiments are both encompassed by the inventive concept.

It is important in the apparatus that the rolling roller opposite the centrally rotating rolling roller performs an eccentric stroke with its outer circumference in the direction of the outer circumference of the centrally rotating rolling roller.

With this Exzenterhub a cyclic opening and closing of the roll gap is achieved, and when the roll gap is closed, the transformation of the rolling stock takes place, whereas when the roll gap is open, the rolling stock is either added or removed.

As a piecewise isolated rolling stock in this case all rotationally symmetrical metal parts must be reshaped, such as screws, rods, which is cut to a certain length, plastic parts, plastic-metal composite parts, wood or the like workpieces. It depends essentially not on the choice of material of the rolled material to be formed, but only that it is conveyed into the roll gap cyclically, the roll gap is extended during the delivery, and that it is closed with a closed nip on the outer circumference with a suitable thread or a suitable profile forming is provided, and that after the conversion of this rolling stock it can be discharged again with open nip.

In the case of the formation of the rolling stock as a screw blank it is processed between two rotating, profiled rolling rolls. The first profiled cylindrical rolling roll rotates about its own axis and will be referred to as rolling roll A in the text below.

The second cylindrically profiled roller also rotates about its own axis and will be referred to as rolling roller B in the text below. However, it describes due to an eccentric receiving sleeve an eccentric track on the outer circumference.

The working stroke of the eccentric roller B thus takes place through an axial offset to the drive shaft.

The size of the axial offset depends on the thread pitch to be produced (single roll depth).

A larger thread pitch requires a larger axial offset.

As an example, it can be stated that if a thread

M6 x 1 = chopper depth 0.613 mm according to DIN13-1,

M8 x 1, 25 = rolling depth 0,767 mm according to DIN13-1.

About the rolling roller A, a workpiece-receiving cage is arranged, which is referred to in the following text as a parts basket. This parts basket is driven by a step gear. The parts basket feeds the blanks into the forming process in individual timed steps and transports the finished screws out of the forming process.

In general, the rolling operation can be described as follows in one complete revolution of the two rolling rolls A, B.

1st idle stroke: In the first step, in which the blank has been positioned between the two rolling rolls A and B, the rotating rolling roll B moves toward the likewise rotating rolling roll A in the idle stroke.

2nd rolling path:

Once the blank has been touched by both rollers, the second step, the rolling path, begins. The rotating rolling roll B continues to move toward the rotating rolling roll A. The thread forming process continues until no material is reshaped.

3. Loading path:

In the third step, on the way back of the eccentric stroke of the roller B, the workpiece is released. During the loading path, the parts basket rotates and conveys the rolled screw out of the rolling position while introducing a new blank into the rolling position.

After performing a tool rotation of 360 degrees, a new work process begins.

The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.

All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.

In the following the invention will be explained in more detail with reference to drawings showing only one embodiment. Here are from the drawings and their description further features essential to the invention and advantages of the invention. Show it:

Figure 1: Top view of the device for thread rolling with two rollers

Figure 2: section through the device of Figure 1 as a central longitudinal section

Figure 3: the diagram of a duty cycle in the form of a lift curve

Figure 4: the stroke of the rolling roller over a distance of 1 mm in one full turn

According to FIG. 1, the roll-forming machine 1 according to the invention consists of two rolling rolls 3, 13 driven in opposite directions to one another, the left-hand rolling roll B being designed as an eccentrically driven rolling roll.

On a machine frame 2, said rolling roller 3 is rotatably driven in a rotary bearing 4 in a rotation axis 44, because a central rolling shaft 5 is provided, which is coupled at its outer periphery via a sliding block 7 with an eccentric sleeve 8, which during the rotation of the rolling roller in the direction of arrow 6 for a lifting movement in the direction of arrow 28 (wobble) ensures.

In this way, a rolling gap 43 (see Figure 2) is formed in a full revolution of the roller 3, which in the space between the outer periphery of the roller 3 and the outer periphery of the opposite, centrally driven and rotating roller 13, which opens cyclically and closes.

The line 9 in this case denotes the gear center in the drive gear and thus from the central axis of rotation 44, while the line 10 describes the highest point of Exzenterverstellung the eccentric sleeve 8.

In this way, an eccentric stroke 36 (see FIG. 2) with respect to the central axis of rotation 44 can be achieved. This Exzenterhub 36 serves the one-time adjustment of the size of the roll gap and changes over the Angle of rotation of the roller 3 no longer. It is set once and determines the basic width of the nip 43.

As an adjustment of this Exzenterhubes serve the auxiliary points 11, 12 and 14, in their overall position, the whale shaft 5 can be rotated to adjust the required Exzenterhub 36 once and then set.

However, for the cyclic opening and closing of the nip 43, the smaller eccentric stroke 64 (see FIG. 2), which results from the eccentric mounting of the eccentric sleeve 8, is used.

The Exzenterhub 36 indicated therein is used to adapt to the diameter of larger or smaller rolling stock 26 by means of the auxiliary points 11, 12 and 14, while the smaller Exzenterhub 64 (see Figure 2) causes an adjustment or a rotation of the eccentric sleeve 8 and the cyclic opening and closure of the nip 43 is provided.

The right-hand rolling roller 13 has a roller shaft 15, which is mounted centrally in a rotation axis 45 and rotates, for example, in the direction of arrow 16. The outer periphery is provided with a rolling thread 27. The rolling thread on the roller 3 is indicated at 17.

After the rolling roller 13 is mounted centrally, only a round sleeve 18 is present, which is connected to a sliding block 7 with the roller shaft 15.

In Figure 1 is still shown with respect to the sliding block 7 on the roller 3, that this nut connects the eccentric sleeve 8 with the roller shaft 5.

For cyclical feeding of rolling stock, a supply device is provided, which consists essentially of a feed channel 22 and a discharge channel 32. The rolling stock 26 is fed via the feed channel in the direction of arrow 23 and then passes outwardly open receptacles 21 of a parts basket 19, which is driven separately from the rotation of the roller shaft 15, in the opposite direction in the direction of arrow 24 in comparison to the drive direction of the roller 13 in Arrow direction 16.

The rolling stock 26 is thus introduced in pieces in each case an open receptacle 21, wherein the rolling stock 26 rests on an annular flange 20 of the parts basket 19 and is supplied to the nip 43 in the direction of arrow 24. Likewise, the rolling stock 26 can be hung hanging on the head of the top of the flange 19 of the basket.

After rolling has been completed, the rolling stock is conveyed out of the now open roll gap 43 and leaves the discharge channel 32 in the direction of the arrow 25.

The rolling stock 26 is protected in the receptacles 21 against falling out by a guard rail 29.

In Figure 2, the further details of the structural design of the rolling mill 1 according to the invention are shown.

It can be seen that the eccentric sleeve 8 is arranged on the upper side of the left rolling roller 3, which is connected via the sliding block 7 with the inner roller shaft 5, so that the entire eccentric sleeve ensures a displacement of the roller 3 in the direction of arrow 28 and so the required Exzenterhub 64 performs.

To fix the rotational position of the eccentric sleeve 8, a pressure washer 30 is used, which is pressed by means of screws 33 on the upper side of the roller 3, wherein the eccentric sleeve 8 remains free. In this case, a pressure ring 31 is used, which is penetrated by the screws 33 and which is screwed onto an associated external thread 34 of the rolling shaft 5.

The rolling shaft 5 is still rotatably supported by spaced-apart roller bearings 37, and provided for the output width of the nip 43 eccentric adjustment with the eccentric axis 38 and the Exzenterhub 36 is not shown in detail. It is a conventional eccentric adjustment of the rolling shaft 5 to the Exzenterhub 36, which is set once and then fixed.

The bottom of the roller 3 is located on a shim 35, which is designed to be interchangeable and the thread height of the rolling stock 26 is precisely adjustable.

The shim 35 allows for a displacement of the roller 3 in the axial direction. It is therefore a height adjustment game.

According to FIG. 2, it can be seen for the right-hand rolling roller 13 that the local roller shaft 15 is mounted in a central axis of rotation 45, and likewise the centric round sleeve 18 is coupled to the outer circumference of the roller shaft 15 via the sliding block 7.

With a step gear 46, a gear 48 is intermittently and stepwise driven so that it is rotatably coupled via an intermediate flange 49 with the annular flange 20 of the feeder (parts basket 19).

In this way, a stepwise intermittent drive rotational movement is achieved for the annular flange 20, on which the rolling stock 26 to be supplied is introduced into the nip 43.

On the annular flange 20 of the parts basket 19 is arranged, in the receptacles 21, the reshaped screws or the rolling stock 26 are arranged. In Figure 2, only the teeth mesh 47 between the indexer 46 and the gear 48 is shown schematically.

In Figure 2, the eccentric adjustment with respect to the Exzenterhubes 36 is still shown on the left side. This is done according to Figure 2, characterized in that a central bearing flange 39 is present, which forms an inner eccentric circumference, wherein on the inner circumference still an exemption 40 with respect to the outer circumference of the whale shaft 5 is arranged.

Was the correct Exzenterhub 36 found, then the rotational position of the bearing flange 39 is set via a clamping sleeve 42 which cooperates with a clamping ring 41.

FIG. 3 shows a working cycle of a lifting cam 53 of the rolling roller 3, the abscissa representing the angle of rotation of the rolling roller and the ordinate the stroke of the rolling roller. It can therefore move between a stroke of 0 to 0.5 mm, for example.

At position 59, rotation begins in the direction of arrow 54 and is an idle stroke 60 that ends at position 55.

After exceeding the position 55, the top dead center is reached, wherein between the position 55 and 56, an idle stroke 60 takes place.

From the position 56, the actual rolling path 57 of the rolling roller 3, which takes place beyond the bottom dead center up to the position 51 with the indicated rotation angle of, for example, 270 degrees.

From position 51, a loading path 58 is then carried out, in which the roll gap 43 is opened and the rolling stock 26 is introduced into the opened roll gap. Upon further rotation is then completed at position 52 of the loading path and there is a new process that begins with position 55 and 56 again in Figure 3. According to Figure 4 thus the stroke of the roller can be changed by 1 mm at a revolution of, for example, 360 degrees. This is only an exemplary dimension and is not intended to limit the invention in any way.

It is shown that there is either a forward stroke 21 for closing the roll gap or a reverse stroke 62 for opening the roll gap, and that overall the Exzenterhubkurve 63 is indicated in Figure 4 on the rotation angle and the stroke.

From the present invention there is the advantage that with a very high production capacity precise forming work on the deformable rolling stock 26 can be made. Such a machine has a production capacity of, for example, 400 pieces per minute, wherein the feeding movement of the parts basket 19 with the annular flange 20 must be synchronized exactly with the Exzenterhubkurve 63 in Figure 4, to ensure that when the nip is opened, a part is inserted, can then be reshaped and removed after forming with the nip open.

drawing Legend

1 rolling machine

2 machine frame

3 roller B (left eccentric)

4 pivot bearings

5 whale wave

6 arrow direction

7 slot nut

8 eccentric sleeve

9 line (gear center)

10 line (highest point)

11 auxiliary point

12 auxiliary point

13 Rolling roller A (right)

14 auxiliary point

15 whale wave (right)

16 arrow direction

17 rolling thread (left)

18 round sleeve (right)

19 parts basket

20 ring flange

21 intake (for rolling stock)

22 feed channel

23 arrow direction

24 arrow direction (parts basket)

25 arrow direction

26 rolling stock

27 rolling thread (right)

28 wobbling motion

29 guardrail

30 pressure disk

31 pressure ring discharge channel

screw

thread

Shim Eccentric stroke

roller bearing

Eccentric axis bearing flange

exemption

clamping ring

collet

nip

Rotary axis (from 4) Rotary axis (from 13) Step gear meshing

gear

Intermediate flange position (loading path) position

stroke curve

arrow

position

Walzweg

Beladeweg

position

idle stroke

Stroke (forward) Stroke (backward) Eccentric stroke Eccentric stroke

Claims

claims

1. A method for thread rolling workpieces (26) on the basis of opposite and co-driven rolling rollers (3, 13) in the forming process, with a between the rollers (3, 13) forming the nip (43) in which the workpiece (26) to be formed is provided on its outer periphery by forming with a roller-side rolling thread (17, 27) with a thread or a thread-like profile, characterized in that in a first process step at least one rolling roller (3) performs a lifting movement to open the roll gap (43) in that, in a second method step, the rolling stock (26) to be formed is conveyed into this open nip (43) in such a way that the nip (43) narrows in a third method step so that the rolling thread (17, 27) of the opposed rolling rolls (17, 27) 3, 13) reshapes the outer circumference of the rolling stock (26), and that in the next method step the rolling gap (43) re-opens net and the finished rolled stock (26) from the roll gap (43) is conveyed away.

2. The method according to claim 1, characterized in that via one of a step gear (46) driven feeding the rolling stock (26) in synchronized steps in individual clocked steps the roll gap (43) is fed and discharged after the forming process.

3. Device for thread rolling of workpieces (26) on the basis of opposite and co-driven rolling rollers (3, 13) in the forming process, with a between the rollers (3, 13) forming the nip (43), in which the workpiece (26) to be formed is provided on its outer periphery by forming with a roller-side rolling thread (17, 27) with a thread or a thread-like profile, characterized in that the one roller (13) is mounted centrally and rotationally driven, and coaxially on the axis of rotation (45) a Feeding device with a parts basket (19) is arranged, which synchronizes the rolling stock in the roll gap (43) leads and discharged therefrom.

4. Apparatus according to claim 3 for carrying out the method according to one of claims 1 or 2, characterized in that the centrically rotating rolling roller (13) opposite rolling roller (3) for carrying out the rolling forming a first Exzenterhub (64) with its outer periphery in the direction of the outer circumference of the centrally rotating rolling roller (13) performs.

5. Device according to one of claims 3 or 4, characterized in that the rolling roller (3) with a central roller shaft (5) in a rotary bearing (4) in a rotation axis (44) is driven to rotate and one for the output width of the roll gap ( 43) provided eccentric adjustment with an eccentric axis (38) for the second Exzenterhub (36) is provided.

6. Device according to one of claims 3 to 5, characterized in that the feed device is designed as a parts basket (19) which is arranged coaxially on the axis of rotation of the roller (13) and opposite to the direction of rotation of the central rolling roller (13) is driven and synchronized with the rolling roller (3).

7. Device according to one of claims 3 to 5, characterized in that the parts basket (19) is arranged coaxially on the axis of rotation of the roller (13) and is driven in the same direction of rotation as the central roller (13) and with the roller ( 13) is synchronized.

8. Device according to one of claims 3 to 7, characterized in that the rolling stock (26) cyclically via a feed channel (22) in an outwardly open receptacle (21) of the parts basket (19) is piecewise fed and the rolling stock (26) on an annular flange (20) of the parts basket (19) rises and the roll gap (43) can be fed.

9. Device according to one of claims 3 to 8, characterized in that the rolling stock (26) cyclically via a feed channel (22) in an outwardly open receptacle (21) of the parts basket (19) is piecewise fed and the rolling stock (26) is suspended in the upper part of the parts basket (19) and the roll gap (43) can be fed.