DE102019211780A1 - Method for setting cores on a carcass machine of a tire building machine - Google Patents

Abstract

A method for setting cores on a carcass machine (1) of a tire building machine, with an expandable carcass drum (2), core setting devices (5), expandable bellows supports (3) with inflatable bellows (4) and expandable core fixers (8), the method following one after the other the following steps: a. Expanding the carcass drum (2) and the bellows carrier (3) to the contact diameter, b. Placing an inner layer and at least one carcass ply (7) on the carcass drum (2) and the bellows supports (3) positioned to the side of the carcass drum (2), c. axial movement of the bellows carrier (3) away from the carcass drum (2) by an amount which is coordinated with the expansion movement of the carcass drum (2) following in step f) and which takes into account the rounding of its segments on the end faces, d. Moving the cores (6) by means of the core setting devices (5) over the core fixers (8), e. Expanding the core fixators (8) and fixing the cores (6) to the carcass ply (s) (7), f. Expanding the carcass drum (2) and synchronously moving the bellows carrier (3) laterally to the carcass drum (2) while the core setting devices (5) are adjusted until they press the cores (6) against the drum shoulders, g. Moving back the core setting devices (5) and creating the carcass turn-ups by inflating the bellows (4), h. Finishing the tire carcass.

Description

The invention relates to a method for setting cores on a carcass machine of a tire building machine, with an expandable carcass drum, core setting devices, expandable bellows supports with inflatable bellows and expandable core fixers.

The construction of green tires for passenger cars takes place either in a one-step process or in a two-step process. In the two-stage process, a tire building machine, a carcass machine, a tire carcass from an inner layer, a carcass insert, cores consisting of bead cores and apexes and sidewall parts are built up in the first stage. The built-up tire carcass is finally removed from the carcass drum and transported to the second stage, the crowning machine, by means of a transfer device. On this machine the tire carcass is cambered and connected with a belt / tread package. Components of the carcass machine are next to the carcass drum positioned, segmented and therefore expandable and retractable bellows supports with inflatable bellows, furthermore arranged on the bellows supports core fixers, which can be expanded and retracted in relation to the bellows supports, as well as core setting devices, which the cores on the carcass insert position. In the usual method, the inner layer and the carcass ply (s) are applied to the carcass drum, with the lateral edge sections of the carcass ply (s) being applied to the bellows supports or their bellows positioned at the same level as the outside of the building drum at this point in time. The carcass drum is then expanded a little, the core setting devices with the cores moved up, the cores being placed on the side sections of the carcass ply (s) sloping down towards the bellows and being pressed against the drum shoulders by moving the core setting devices to the carcass drum. In the course of this, bulges or waves can undesirably form in the carcass ply on the outer surface of the drum, immediately adjacent to the drum shoulders, whereby the thread length of the carcass ply (s) can vary greatly between the cores, so that the quality of the tires produced is impaired. In addition, the core setting process described does not allow the cores to be set centrally.

The invention is based on the object of providing a method for setting the cores or changing the sequence of core setting in such a way that the cores are set as centrally as possible and that bulges or waves are formed in the carcass ply (s) is avoided.

1. a. Expandieren der Karkasstrommel und der Balgträger auf den Auflegedurchmesser,
2. b. Auflegen einer Innenschicht und zumindest einer Karkasseinlage auf die Karkasstrommel und die seitlich der Karkasstrommel positionierten Bälge der Balgträger,
3. c. Wegfahren der Balgträger von der Karkasstrommel um ein Ausmaß, welches auf die in Schritt f) folgende Expansionsbewegung der Karkasstrommel abgestimmt ist und die Rundung ihrer Segmente an den Stirnseiten berücksichtigt,
4. d. Verfahren der Kerne mittels der Kernsetzvorrichtungen über die Kernfixierer,
5. e. Expandieren der Kernfixierer und Fixieren der Kerne an der/den Karkasseinlage(n),
6. f. Expandieren der Karkasstrommel und dazu synchrones Verfahren der Balgträger seitlich an die Karkasstrommel unter Nachführen der Kernsetzvorrichtungen bis diese die Kerne an die Trommelschultern drücken,
7. g. Zurückfahren der Kernsetzvorrichtungen und Erstellen der Karkasshochschläge durch Aufblähen der Bälge,
8. h. Fertigstellen der Reifenkarkasse.

The object set is achieved according to the invention with a method with the following successive steps:

1. a. Expanding the carcass drum and the bellows support to the fitting diameter,
2. b. Placing an inner layer and at least one carcass insert on the carcass drum and the bellows of the bellows carrier positioned to the side of the carcass drum,
3. c. Moving the bellows away from the carcass drum by an amount which is matched to the expansion movement of the carcass drum following in step f) and which takes into account the rounding of its segments on the end faces,
4. d. Moving the cores by means of the core setting devices over the core fixers,
5. e. Expanding the core fixers and fixing the cores to the carcass ply (s),
6. f. expanding the carcass drum and synchronously moving the bellows to the side of the carcass drum while tracking the core setting devices until they press the cores against the drum shoulders,
7. G. Retraction of the core setting devices and creation of the carcass turn-ups by inflating the bellows,
8. H. Finishing the tire carcass.

In the method according to the invention, the bellows supports are moved somewhat away from the carcass drum before the cores are set. The lay-on diameter is not changed and the lateral sections of the carcass ply (s) remain on the bellows, albeit to a lesser extent. The carcass ply (s) are then “lifted” locally by the core fixation in order to connect the carcass ply (s) to the cores. The carcass drum is now expanded and the bellows supports are moved synchronously with the core setting devices in the direction of the carcass drum until the cores rest on the drum shoulders. In particular, the fact that in step c) the extent of the movement of the bellows carrier away from the carcass drum is matched to the expansion movement of the carcass drum following in step f) ensures that no bulges or waves can form in the area of the carcass insert. By “lifting” the carcass ply (s), the cores are positioned exactly centrically on the carcass ply (s).

In a preferred embodiment of the method, the change in the diameter of the carcass drum is detected in step f) with a sensor device. This enables an exact synchronous Follow-up of the bellows carrier in step f) takes place or the follow-up can be precisely controlled in order not to cause any undulations in the carcass ply (s).

In a further preferred embodiment, in step f) the two bellows carriers are adjusted during the expansion of the carcass drum via the tensile force present on the threads in the carcass insert. This also makes it possible to effectively avoid bulges and waves in the carcass ply.

Particularly advantageous and preferred is an embodiment in which the carcass drum is expanded by a motor in step f), the extent of the expansion of the carcass drum being electronically synchronized with the axial movement of the bellows supports.

• 1 bis 9 anhand vereinfachter und schematischer Darstellungen von Bestandteilen einer Karkassmaschine einzelne Schritte des Verfahrens gemäß der Erfindung.

Further features, advantages and details of the invention will now be described in more detail with reference to the schematic drawing which shows an embodiment. Show it

• 1 to 9 individual steps of the method according to the invention using simplified and schematic representations of components of a carcass machine.

The figures show components of a carcass machine 1 - the first stage of a two-stage tire building machine - for building tire carcasses from green tires for car radial tires. The one on the carcass machine 1 Tire carcasses built up comprise an inner layer, a carcass insert, possibly also two Katkasseinlage, cores consisting of bead cores and apexes and possibly sidewall profiles. In the figures, only components of one half or side of the carcass machine are in each case 1 , shown in the figures on the left-hand side, on the second side the process steps described run equally with the same components. The constituent parts shown are also rotationally symmetrical to the one indicated by the dashed line, in a manner not shown a indicated central axis of the carcass machine 1 executed or arranged.

The carcass machine 1 has a carcass drum that is segmented in a known manner and thus expandable and retractable 2 and two on the side of the carcass drum 2 positioned, in the direction of the axis a movable, also segmented and thus expandable and retractable bellows supports 3 with inflatable bellows 4th on. On the bellows supports 4th are perpendicular to the axis a expandable and retractable core fixation 8th arranged. The carcass machine 1 further comprises two in the direction of the axis a movable core setting devices 5 , of which in the figures the outside of the one left bellows support 4th positioned left core setting device 5 is shown.

1 shows that stage of the tire carcass building process at which the core-setting devices 5 already pips 6th have been positioned by means of core centering devices not shown. The carcass drum 2 is expanded to its support diameter, the bellows support 3 are expanded to the extent that the outer surfaces of the unactuated bellows 4th together with the outer surface of the carcass drum 2 essentially form a uniform, cylinder jacket-shaped contact surface on which the inner layer and the carcass ply 7th be applied and spliced ( 1 ). Only the carcass insert is shown in the figures 7th indicated as a thin line. In the next step ( 2 ) are the two bellows supports 3 in each case by an amount which is due to the subsequent expansion movement of the carcass drum 2 is matched and takes into account the rounding of its segments on the front sides, moved apart and therefore at a distance from the carcass drum 2 positioned, with their other position opposite the carcass drum 2 is retained and the inner layer and the carcass ply 7th with side sections on the bellows 4th remain. It will therefore increase the amount of movement of the bellows support 3 ensured that during the subsequent expansion of the carcass drum 2 and the approach of the bellows support 3 the carcass insert optimally fits or hugs the cores and shoulders of the segment of the carcass drum.

In the next step ( 3 ) become the core setting devices 5 including the kernels 6th about the core fixer 9 driven, which are then expanded and thereby the cores 6th on the carcass ply 7th fix ( 4th ). The carcass drum 2 is being expanded 5 , 6th ), with the bellows support 3 including the core fixers 8th and also the core setting devices 5 synchronously to the carcass drum 2 are moved up to the core setting devices 5 the kernels 6th press against the drum shoulders ( 7th ). It becomes the bellows support at the above-mentioned amount of movement away 3 made sure that when expanding the carcass drum 2 and the approach of the bellows support 3 the carcass ply 7th optimally to the cores 6th and the shoulders of the segments of the carcass drum 2 applies or hugs, as in 7th shown. According to a preferred measure, a sensor device detects 9 the extent of the change in the drum diameter during the expansion in order to ensure that the bellows supports are synchronized 3 to ensure. In an alternative design, the two bellows supports 3 in the expansion of the carcass drum 2 via the tensile force on the threads in the carcass ply 7th tracked.

The further construction of the tire carcass 2 takes place with the usual, known method steps, in particular moving away the core setting devices 5 ( 8th ), Swiveling away the sensor device ( 9 ), Creating the carcass turn-ups by inflating the bellows 4th and setting the side wall profiles.

List of reference symbols

1

Carcass machine

2

Carcass drum

3

Bellows support

4th

bellows

5

Core setting device

6

core

7th

Carcass insert

8th

Core fixer

9

Sensor device

a

central axis

Claims (4)

Method for setting cores on a carcass machine (1) of a tire building machine, with an expandable carcass drum (2), core setting devices (5), expandable bellows supports (3) with inflatable bellows (4) and expandable core fixers (8), wherein the method has the following successive steps: a. Expand the carcass drum (2) and the bellows support (3) to the fitting diameter, b. Placing an inner layer and at least one carcass insert (7) on the carcass drum (2) and the bellows supports (3) positioned to the side of the carcass drum (2), c. axial movement of the bellows carrier (3) away from the carcass drum (2) by an amount which is matched to the expansion movement of the carcass drum (2) following in step f) and which takes into account the rounding of its segments on the end faces, d. Moving the cores (6) by means of the core setting devices (5) over the core fixers (8), e. Expanding the core fixers (8) and fixing the cores (6) to the carcass ply (s) (7), f. expanding the carcass drum (2) and synchronously moving the bellows support (3) laterally to the carcass drum (2) while the core setting devices (5) are adjusted until they press the cores (6) against the drum shoulders, G. Retracting the core setting devices (5) and creating the carcass turn-ups by inflating the bellows (4), H. Finishing the tire carcass. Procedure according to Claim 1 , characterized in that in step f) the change in the diameter of the carcass drum (2) is detected with a sensor device (9). Method according to Claim 1, characterized in that in step f) the two bellows supports (3) are adjusted during the expansion of the carcass drum (2) via the tensile force present on the threads in the carcass ply (7). Method according to one of the Claims 1 to 3 , characterized in that in step f) the carcass drum (2) is expanded by a motor, the extent of the expansion of the carcass drum (2) being electronically synchronized with the axial movement of the bellows supports (3).

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