DE102010000366A1 - A process for the production of vehicle tires in the material strip from a raw rubber mixture are wound on a tire building drum - Google Patents

Abstract

In order to provide a method with which relatively narrow and thin material strips can be wound up with a high manufacturing quality, the following method is proposed with the following steps: - generating a material strip (5) from a raw rubber mixture with an extruder (10), - forwarding the material strip ( 5) to a document unit (8) for winding the material strip (7) onto the tire building drum, - calendering the material strip (5) with the document unit (8), the material strip (5) between a first (2) and second calender roll (3 ) and is calendered to the specified material strip size and the material filling of the calender gap between the first and second calender rolls (2, 3) is monitored with a calender gap sensor (4), whereby the calendering of the material strip (7) with a constant Material strip cross-section is guaranteed, - Forwarding of the calendered material tire (7) over the second calender roll (3) to the tire building drum (1), - winding the calendered material strip (7) with the second calender roll (3) onto the tire building parts already resting on the tire building drum (1), whereby the material strip (7 ) is transferred directly with the second calender roll (3) to the tire building parts already resting on the tire building drum (1), the second calender roll (3) being in contact with the tire building drum (1) via the material strip (7) and the tire building parts already on it and indirectly rolls off the tire building drum (1) and - further processing and finishing of the vehicle tire to be produced with a conventional production method.

Description

The invention relates to a method for producing vehicle tires in which material strips are wound from a raw rubber mixture onto a tire building drum.

In one way of producing vehicle tires, it is manufactured in such a way that in particular the tread in the form of narrow strips of rubber or material strips is wound onto the green tire which is located on a tire building drum. The rubber strips, which consist of a raw rubber mixture, are produced directly before the winding process with an extruder. Such a method is z. B. in the EP 109 49 930 B1 disclosed.

One problem is that with certain vehicle tires, especially vehicle tires for cars, the required material strips must be very small. This is because the thinner and narrower the material strips used, the more accurate the replica of certain tire components. In the case of conventional methods, the problem may arise that the strips of material in front of or behind the cover unit are torn because of the small cross-section of the material. After such tearing of the strip of material, the manufacturing process would be stopped. Subsequently, the document unit would have to be re-stocked with the material strip and only then could the manufacturing process be continued.

The invention had the object of providing a method by which relatively thin strips of material can be wound up with a high production quality with a tire building drum.

• – Erzeugen eines Materialstreifens aus einer Rohgummimischung mit einem Extruder,
• – Weiterleitung des Materialstreifens zu einer Belegeinheit zum Aufspulen des Materialstreifens auf die Reifenaufbautrommel,
• – Kalandrieren des Materialstreifens mit der Belegeeinheit, wobei der Materialstreifen zwischen einer ersten und zweiten Kalanderrolle hindurchgeführt und dabei auf die vorgegebene Materialstreifengröße kalandriert wird und wobei die Materialfüllung des Kalanderspaltes zwischen der ersten und der zweiten Kalanderrolle mit einem Kalanderspalt-Sensor überwacht wird, wodurch das Kalandrieren des Materialstreifens mit einem konstanten Materialstreifen-Querschnitt gewährleistet wird,
• – Weiterleitung des kalandrierten Materialstreifens über die zweite Kalanderrolle zu der Reifenaufbautrommel,
• – Aufspulen des kalandrierten Materialstreifens mit der zweiten Kalanderrolle auf die bereits auf der Reifenaufbautrommel aufliegenden Reifenaufbauteile, wobei der Materialstreifen unmittelbar mit der zweiten Kalanderrolle auf die bereits auf der Reifenaufbautrommel aufliegenden Reifenaufbauteile übertragen wird, wobei die zweite Kalanderrolle über den Materialstreifen und die bereits aufliegenden Reifenaufbauteile mit der Reifenaufbautrommel in Kontakt steht und an der Reifenaufbautrommel indirekt abrollt und
• – Weiterverarbeitung und Fertigstellung des herzustellenden Fahrzeugreifens mit einem konventionellen Herstellungsverfahren.

The task is solved by a procedure with the following steps:

• Producing a strip of material from a raw rubber mixture with an extruder,
• - Forwarding of the material strip to a document unit for winding the material strip on the tire building drum,
• Calendering the strip of material with the cover unit, wherein the strip of material is passed between a first and second calender roll and calendered to the predetermined material strip size and wherein the material filling of the calender nip between the first and the second calender roll is monitored with a calender nip sensor, whereby the calendering the material strip is ensured with a constant material strip cross-section,
• - passing the calendered material strip over the second calender roll to the tire building drum,
• Winding the calendered material strip with the second calender roll onto the tire building parts already resting on the tire building drum, the material strip being transferred directly to the second calender roll on the tire building parts already resting on the tire building drum, the second calender roll bearing over the strip of material and the already resting tire building parts the tire building drum is in contact and indirectly rolls on the tire building drum and
• - Further processing and completion of the vehicle tire to be produced with a conventional manufacturing process.

An advantage of the invention is to be seen in particular in that very small and thin strips of material can be reliably wound up with the tire building drum by the method according to the invention. This ensures optimum component geometry for the vehicle tires to be produced, in particular for a large number of car and motorcycle tires. The process makes it possible to wind very narrow strips of material with a width of approx. 10 mm and very thin strips of material with a cross-section height of approx. 0.8 mm directly and reliably on a green tire. These advantages are made possible, in particular, by the calendering of the strip of material taking place with the covering unit, which is composed of a first and a second calender roll. The material strip is calendered by the two calender rolls and then transferred directly to the green tire. As a result, the material strip is guided reliably and precisely at each point after calendering, as a result of which the strip of material in this area can not be torn open unintentionally. In addition, the material filling of the calender nip between the first and the second calender roll is monitored with a calender gap sensor. This has the decisive advantage that a calendered material strip is produced with a constant material cross-section, which is then wound onto the tire building components resting on the building drum. As a result, the manufacturing quality of the vehicle tires to be produced is also substantially increased.

In an advantageous development of the invention, it is provided that the material filling of the calendering nip is monitored with the calendering gap sensor and the fine regulation of the rotational speeds of the first and second calendering rolls takes place via a signal evaluation of the sensor.

The fine control allows the rotational speed of the first and second calender rolls to be adjusted, so that the material strip produced has a constant material cross-section at all times.

In a further advantageous embodiment of the invention, it is provided that the first and second calender rolls are each driven by an electric motor, wherein the rotational speed of the second calender roll may be greater than the rotational speed of the first calender roll, thereby stretching the calendered strip of material.

By stretching the strip of material, a strip of material with even smaller cross-sectional dimensions is achieved. As a result, very narrow and very thin strips of material can be produced.

In a further advantageous development of the invention, it is provided that the adhesion of the material strip to the second calender roll is monitored with at least one calender roll sensor.

The calender roll sensors monitor the adhesion of the strip of material to the second calender roll. For example, it is conceivable that the material strip does not adhere to the second, but to the first calender roll, in which case the manufacturing process would have to be stopped immediately.

In a further advantageous embodiment of the invention, it is provided that the forwarding of the strip of material from the extruder to the receipt unit via a movable in height conveyor belt.

As a result, the supply of the material strip to the document unit can be adapted to the respective requirements.

In a further advantageous embodiment of the invention, it is provided that the conveyor belt is moved with a linear servo motor drive in an oblique orientation.

With the linear servomotor drive, the conveyor belt can be easily adjusted in its oblique orientation or height.

In a further advantageous embodiment of the invention, it is provided that the conveyor belt is moved in an obliquely upward orientation in order to extend the effective conveyor belt length and to store the material strip caster. Due to the obliquely upward orientation of the conveyor belt, the effective conveyor belt length is extended. As a result, the material strip caster can be stored accordingly.

In a further advantageous embodiment of the invention, it is provided that the conveyor belt comprises two auxiliary rollers, which are arranged on the conveyor belt in the middle and can be moved in the vertical direction in order to extend the effective conveyor belt length and store the material strip caster.

This advantageous development is in the 2 and 3 shown.

In a further advantageous development of the invention, it is provided that the second calender roll is cooled and has a cooler temperature than the first calender roll.

The cooling ensures that the calendered strip of material adheres to the second calender roll. Otherwise, it could happen that the material strip unintentionally adheres to the first calender roll and the production process would then have to be interrupted.

In a further advantageous development of the invention, it is provided that the second calender roll has a larger diameter than the first calender roll.

Since the contact surface of the mixture is physically larger in the case of calendering on the larger second calender roll, the rubber adheres to the second calender roll with the larger diameter for equal specific adhesive properties of the rolls. Otherwise, it could happen that the material strip unintentionally adheres to the first calender roll and the production process would then have to be interrupted.

Reference to an embodiment of the invention will be explained in more detail. It shows:

1 : an embodiment of the method according to the invention

2 : another embodiment of the method

3 a method step of the embodiment in the 2 ,

The 1 shows an embodiment of the method according to the invention.

The apparatus for the method essentially comprises the tire building drum 1 and the voucher unit 8th with the calender rolls 2 and 3 , The Device is shown in a side view. On the tire building drum 1 the tire undercarriage with the tire carcass has already been applied. The voucher unit 8th is three-dimensionally movable in several axes, with the second calender roll 3 the rubber strip or strips of material 7 on the tire building drum 1 is wound up on which there is already a corresponding tire underbody. For the winding process, the document unit 8th to the tire building drum 1 moved up.

The material strip 5 comes from an extruder 10 and consists of a raw rubber mixture. The material strip 5 or the round cord 5 becomes the first and second calender roll 2 and 3 fed and calendered by this, so that then a calendered narrow strip of material 7 is available. The calendered strip of material 7 becomes direct and immediate with the second calender roll 3 on the tire building drum 1 transferred, the tire building drum 1 and the second calender roll 3 unroll and rotate in opposite directions. The procedure ensures that the calendered strip of material 7 reliable and precise on the tire building drum at all times 1 is wound up without the risk of tearing the strip of material 7 consists. The second calender roll 3 should be cooled in this process with a coolant, so that the calendered strip of material preferably adheres to this and not to the first calender roll 2 wraps.

The material strip 5 from the extruder 10 the conveyor belt 16 is supplied by a speed sensor 19 monitors the conveyor belt speed and calender rolls. The conveyor belt 16 is shown in its horizontal orientation, this orientation corresponding to the normal orientation in operation. The conveyor belt 16 is via the linear servo drive 6 slanted. The dashed lines 17 show the conveyor belt in its oblique orientation upwards. In this position, the effective conveyor belt length is lengthened, allowing the material strip caster to be stored accordingly. The dashed line 18 shows the conveyor belt in its oblique orientation down. This alignment is beneficial when it comes to starting the process and the strip of material 5 into the calendering gap between the first and second calender rolls 2 and 3 threading. The calendering gap between the first and second calender rolls is measured with the calendering gap sensor 4 supervised. It must be ensured at all times that the material filling in the calendering gap is sufficient around a calendered strip of material 7 to achieve a constant dimension. The calender gap sensor 4 exerts a fine control on the calender rolls 2 and 3 out, these calender rolls over individual electric motors 11 and 12 be driven separately. Thereby, that the speed of the second calender roll 3 is about 2-5% higher than the speed of the first calender roll 2 , can be a material stretch of the calendered strip of material 7 to reach. The adhesion of the calendered material strip 7 at the second calender roll 3 comes with the calender roll sensors 13 and 14 supervised. When the calendered strip of material 7 from the second calender roll 3 replaces, the process is stopped immediately. The second calender roll 3 at the same time has the function of a Belegerolle, since the strip of material 7 directly from the second calender roll 3 on the tire drum 1 is wound up. In this process, the tire building drum rotate 1 and the second calender roll 3 in opposite directions. With the calender roll sensor 15 is monitored that the calendered strip of material 7 not on the second calender roll 3 sticks. The voucher unit 8th can be three-dimensional in relation to the tire drum 1 method. The movement of the document unit 8th is both in the radial direction 22 as well as in the vertical tire direction 23 possible. The vertical direction of rotation 23 shows the axis of rotation of the document unit 8th passing through the calendering gap between the first and second calender rolls 2 and 3 runs.

The 2 shows a further embodiment of the method according to the invention. This embodiment differs from the embodiment in FIG 1 in that the conveyor belt 20 has another version. The conveyor belt 20 includes two additional rollers 21 which can be moved in the vertical orientation. The other components and functional groups correspond to the embodiment in the 1 , wherein individual components have been omitted in this illustration. The material strip 5 is over the conveyor belt 20 the calender nip between the first and second calender rolls 2 and 3 fed. Subsequently, the calendered strip of material 7 with the second calender roll 3 on the tire building drum 1 wound. The calendering gap is also monitored by a calendering gap sensor 4 ,

The 3 shows the embodiment in the 2 , It is shown a process step in which the two additional roles 21 moved vertically upwards. By this movement, the effective conveyor belt length of the conveyor belt 20 extended. This allows the material tracking of the material strip 5 Save accordingly.

LIST OF REFERENCE NUMBERS

1

Tire building drum

2

First calender roll

3

second calender roll

4

Calender nip sensor

5

Material strip or round cord made of a raw rubber mixture

6

Linear servo drive

7

Calendered material strip

8th

Cover unit consisting of first and second calender roll

9

Drum axis of the tire building drum

10

extruder

11

electric motor

12

electric motor

13

Calender rolls sensor

14

Calender rolls sensor

15

Calender rolls sensor

16

Conveyor belt in horizontal orientation

17

Conveyor in oblique orientation upwards

18

Conveyor in an oblique orientation downwards

19

Speed sensor

20

conveyor belt

21

Additional rollers of the conveyor belt

22

Radial tire direction

23

vertical tire direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 10949930 B1 [0002]

Claims (10)

Method for producing vehicle tires in the narrow and thin strips of material ( 7 ) from a raw rubber mixture to a tire building drum ( 1 ) are wound with the following steps: - producing a strip of material ( 5 ) from a crude rubber mixture with an extruder ( 10 ), - Forwarding of the material strip ( 5 ) to a voucher unit ( 8th ) for winding the material strip ( 7 ) on the tire building drum, - calendering of the material strip ( 5 ) with the voucher unit ( 8th ), whereby the strip of material ( 5 ) between a first ( 2 ) and second calender roll ( 3 ) and thereby calendered to the predetermined material strip size and wherein the material filling of the calender nip between the first and the second calender roll ( 2 . 3 ) with a calendering gap sensor ( 4 ), whereby the calendering of the strip of material ( 7 ) is ensured with a constant material strip cross section, - forwarding the calendered material strip ( 7 ) over the second calender roll ( 3 ) to the tire building drum ( 1 ), - winding up the calendered material strip ( 7 ) with the second calender roll ( 3 ) already on the tire building drum ( 1 ) lying tire building parts, wherein the strip of material ( 7 ) directly with the second calender roll ( 3 ) already on the tire building drum ( 1 ) is applied, wherein the second calender roll ( 3 ) over the strip of material ( 7 ) and the already attached tire building parts with the tire building drum ( 1 ) and on the tire building drum ( 1 ) rolls off indirectly and - further processing and completion of the vehicle tire to be produced with a conventional manufacturing process. A method according to claim 1, characterized in that the material filling of the calender nip with the calendering gap sensor ( 4 ) and thereby the fine control of the rotational speeds of the first and second calender rolls ( 2 . 5 ) via a signal evaluation of the sensor ( 4 ) he follows. Method according to one of the preceding claims, characterized in that the first and second calender rolls ( 2 . 3 ) each with an electric motor ( 11 . 12 ), wherein the rotational speed of the second calender roll ( 3 ) may be greater than the rotational speed of the first calender roll ( 2 ) to thereby stretch the calendered strip of material. Method according to one of the preceding claims, characterized in that the adhesion of the material strip ( 7 ) on the second calender roll ( 3 ) with at least one calender roll sensor ( 13 . 14 . 15 ) is monitored. Method according to one of the preceding claims, characterized in that the forwarding of the material strip ( 5 ) from the extruder ( 1 ) to the voucher unit ( 8th ) via a height-adjustable conveyor belt ( 16 ) he follows. Method according to one of the preceding claims, characterized in that the conveyor belt ( 16 ) with a linear servomotor drive ( 6 ) is moved in an oblique orientation. Method according to one of the preceding claims, characterized in that the conveyor belt ( 17 ) is moved in an obliquely upward orientation, thereby extending the effective conveyor belt length and the material strip caster ( 5 ) save. Method according to one of the preceding claims, characterized in that the conveyor belt ( 20 ) two additional rolls ( 21 ) located on the conveyor belt ( 20 ) are arranged in the middle and can be moved in the vertical direction, so as to extend the effective conveyor belt length and to store the material strip caster. Method according to one of the preceding claims, characterized in that the second calender roll ( 3 ) is cooled and has a cooler temperature than the first calender roll ( 2 ). Method according to one of the preceding claims, characterized in that the second calender roll ( 3 ) has a larger diameter than the first calender roll ( 2 ).

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