DE102006014442A1 - Vulcanization of vehicle tires with heating press, comprises arranging tire blank in the press, heating the blank with heating bellows and heating medium, removing the bellows from tire interior, and heating the blank without the bellows - Google Patents

Abstract

The method for the vulcanization of vehicle tires with a heating press (2), comprises arranging a tire blank (1) in the heating press, heating the tire blank for 2-5 minutes with heating bellows (4) and a first heating medium for a shaping- and forming process, removing the heating bellows from the tire interior (9) of the tire blank, heating the tire blank without using the bellows so that a second heating medium is admitted directly into the tire interior of tire blank, and vulcanizing the tire blank. The heating bellows is moved to a bellows well (3) after the first heating process step. The method for the vulcanization of vehicle tires with a heating press (2), comprises arranging a tire blank (1) in the heating press, heating the tire blank for 2-5 minutes with heating bellows (4) and a first heating medium for a shaping- and forming process, removing the heating bellows from the tire interior (9) of the tire blank, heating the tire blank without using the bellows so that a second heating medium is admitted directly into the tire interior of tire blank and vulcanizing the tire blank. The heating bellows is moved after the first heating process step to a bellows well (3) of the heating press. The second heating medium is admitted by a separate supply line (7) arranged in the bellows well into the tire interior. The bellows well shields the moved heating bellows during second heating process step as far as possible of second heating medium. The second heating process step takes place outside of the heating press.

Description

The The invention relates to a method for vulcanizing vehicle tires with a hot press.

The Tire vulcanization takes place in heating presses, in which the green tire used in suitable mold segments and under the action of heat as well Pressure is vulcanized. On the inside of the tire becomes a more flexible Bellows attached to the tire, which acts on a heating medium and in this way the green tire from the inside the supplies necessary vulcanization energy. The feeder of Vulcanization energy over The inside of the tire is called interior heating. The necessary Vulkanisationstemperaturen and the vulcanization time are from dependent on different parameters, e.g. of the tire type.

at Tire vulcanization with a bladder is a disadvantage in that the heating times are relatively long and fast aging the bladders he follows. Thereby have to the bladders exchanged at regular intervals in the heating presses become. It is well known in a tire vulcanization entirely on to dispense with a bellows and the green tire so to speak, without bellows to vulcanize by placing a heating medium in direct contact with the Tire inside stands. In this so-called bellows-free vulcanization There is a disadvantage in that the shaping process in the bead area the vehicle tire does not reach satisfactory results. In particular, it should be noted that the tire bead when bellows Vulcanizing unevenly formed is. Another disadvantage of the bellows-free vulcanization is with an undesirable uneven surface of the Tire inside connected.

Of the Invention is based on the object, a method for vulcanization of vehicle tires, in which the vulcanization in Essentially blatantly done and at the same time with vehicle tires a high production quality be generated.

• – Anordnung eines Reifenrohlings in der Heizpresse
• – Durchführung eines ersten Heizprozessschrittes mit einem Heizbalg und einem ersten Heizmedium, wodurch der Reifenrohling eine erste Formgebung erhält
• – Entfernung des Heizbalges aus dem Reifeninnenraum des Reifenrohlings
• – Durchführung eines balglosen zweiten Heizprozessschrittes bei dem ein zweites Heizmedium direkt in den Reifeninnenraum des Reifenrohling eingelassen wird und
• – Ausvulkanisierung des Reifenrohlings.

The object is achieved according to claim 1, characterized in that a method is carried out with the following steps:

• - Arrangement of a green tire in the heating press
• - Carrying out a first Heizprozessschrittes with a bladder and a first heating medium, whereby the green tire receives a first shape
• - Removal of the bladder from the tire interior of the green tire
• - Carrying out a bellows second heating process step in which a second heating medium is introduced directly into the tire interior of the green tire and
• - vulcanization of the green tire.

One Advantage of the invention is to be seen in particular in that overall a heating time reduction is achieved while the inside of the tire with a surface a high production quality receives. The green tire is in the inventive method only in the initial phase with a bladder vulcanized or heated and thereby simultaneously subjected to a first decisive shaping process. Subsequently, will bladder heated, the heating medium in direct contact with the Tire inside of the green tire occurs. This becomes a direct one Heat transfer to Tire inside reached and overall the heating time of the tire vulcanization shortened. Since the bladder is less stressed, this can frequently be used until, in turn, a replacement of the bladder required becomes.

In an advantageous embodiment of the invention is provided that the first heating process step is only for the period of the and shaping process continues. The first heating process step with a bladder is especially for the molding and shaping process advantageous because in this Initial phase of the green tire essentially receives its final contour.

In a further advantageous embodiment of the invention is provided that the first heating process step after a period of substantially 2 to 5 minutes is completed. This relatively short heating time is for the Einform- and shaping process sufficient to the desired final contour to reach.

In a further advantageous embodiment of the invention is provided that the bladder after the first heating process step in a bellows well the heating press is retracted. That way you can simply remove the bladder from the tire interior.

In a further advantageous embodiment of the invention is provided that the second heating medium by a separate bellows well arranged Supply line is inserted into the tire interior. Over a leaves such supply line in a simple way, the second heating medium in the tire interior introduce.

In a further advantageous embodiment of the invention it is provided that the bellows well shields the drawn-in bladder during the second heating process step as far as possible from the second heating medium. As a result, the bladder is exposed to the lowest possible temperature load during the second heating process step, whereby this has a longer life. In addition, during the second heating process step, the bladder has no contact with the tire, so that diffusion of bellows-decomposing components of the tire blends into the bladder is limited in time, thereby further increasing the bladder life.

Based an embodiment the invention should be closer explained become. It shows:

1 : an apparatus for carrying out the method according to the invention.

1 shows a device according to the invention for vulcanizing vehicle tires in a radial section. The green tire to be vulcanized 1 is in the heating press 2 arranged, which is operated for example with a vaporous heating medium. The heating press 2 is shown schematically. In particular, those are on the outside of the green tire 1 adjacent mold segments not completely but only the lower mold 13 shown. On the lower side is the bellows well 3 with the bladder 4 shown. The heating medium supply in the form of eg steam in the bladder 4 , which has a lower and upper bellows grip 11 and 12 is held, via the supply line 5 , Emptying takes place via the drain line 6 , In the bellows fountain is on an internal mechanism 14 a supply line 7 arranged for the second heating process step. Next to it is another drainage pipe 8th ,

The 1 shows an intermediate step after the first heating process step is completed and the bladder 4 is fed into the bellows well. Before this intermediate step, the bladder is completely inside the tire 9 on the inside of the tire 10 wherein, by the first heating process step, the molding and shaping process of the tire inner side 10 he follows. Through this molding and shaping process receives the inside of the tire 10 and in particular, the tire bead of a high quality shape and surface, as is the case with conventional bladder vulcanization processes. After the first heating process step is completed, the bladder is 4 in the bellows fountain 3 retracted and simultaneously via the supply line 7 the second heating process step is initiated, is heated without bladder. In the second heating process step, the heating medium in the tire interior 9 introduced, which in direct contact with the tire inside the green tire 1 vulcanized to the end.

was standing The technique is heating or vulcanizing under pressure in a heating press. A disadvantage is that for the entire heating cycle the Hot press is claimed, i. correspondingly high Heizpressenkapazitäten for disposal have to stand.

By Divide the pressure heating into a pressure heating with bladder inside and in a pressure heating without bladder outside the heating press can the effective heating time in the heating press can be reduced. The heating system within the heating press can preferably with the above inventive method carried out become.

The heater could then be continued outside the heating press, preferably with a self-closing container and the method listed below, which in the 2 to 10 is shown.

By this method is a more effective utilization of existing Heizpressenkapazität by Reduction of heating time in the heating press possible.

2 shows an embodiment of a press layout, which advantageously with the heating press in 1 can be combined. The press layout includes the heating press 2a , several containers 7a , Grapple 8a for blanks 6a , a conveyor belt 4a for heated tires as well as a power supply 11a , The other parts are the below list of reference numerals removed.

3 shows the method with the step 1 in which an automatic loading of the heating press 2a with an empty first container 12a he follows.

4 shows the step 2 in which an opening of the first container 12a and a loading with a blank 6a he follows.

5 shows the step 3 in which a closing of the first container 12a and the heating press 2a he follows.

6 shows the step 4 in which essentially the phase 1 the heating cycle with a bladder. First, the bladder is filled with high-pressure steam or high-pressure hot water. Subsequently, the blank is heated with bladder until the beginning of the phase listed below 2 , During this process, a transport of another second container takes place 13a from his parking position to the heating press 2a ,

The 7 shows the step 5 in which essentially the phase 2 the heating cycle without bladder is performed. First, a emptying of the bladder and then pulling the bladder from the container into the bellows well. This is followed by filling the inner tire volume with high-pressure steam, high-pressure hot water or high pressure nitrogen. This is followed by an automatic closing of the opening of the first container to the bellows well. After completion of this process, an automatic removal of the first container takes place 12a from the heating press 2a and a transport to the parking position. In the last step, an automatic loading of the heating press takes place 2a with another second container 13a ,

The 8th shows the step 6 in which an opening of the second container 13a and loading takes place with another blank. Meanwhile, the first container is connected to the power supply 11a connected. In this parking position, a continuation of the second heating phase.

9 shows the step 7 in which an exchange of containers 12a and 13a takes place. The second container 13a is transported to its parking position.

The 10 shows the last step 8th in which the heating cycle is ended. There is a discharge of the heated tire from the container 12a , At the same time, the second container is connected to the power supply. In this parking position, a continuation of the second heating phase of the tire takes place in the second container 13a ,

According to the illustrated Methods are parking positions with their own energy supply for self-closing containers intended. In these parking positions, in addition to the heating, additional mold preheating, Form cleaning, mold repairs, mold or container change and Karkasskkühlung under Pressure performed become.

Reference numerals for the 1 :

1

tire

2

hot press

3

Balgbrunnen

4

bladder

5

supply line

6

drain line

7

supply line for second Heizprozessschritt

8th

drain line

9

Tires Interior

10

Tire inside

11

Upper Balgeinklemmung

12

Lower Balgeinklemmung

13

Lower shape

14

internal mechanism

Reference numerals for the 2 - 10 : (Press layout)

1a

heated tires

2a

hot press

3a

grab for the heated tires

4a

conveyor belt for the heated tires

5a

parking position for containers

6a

blank

7a

Container

8a

grab for the blanks

9a

blank state

10a

roll band for the Container

11a

power supply

12a

first Container

13a

second Container

Claims (7)

Method for vulcanising vehicle tires with a heating press ( 2 ) with the following steps, - arrangement of a green tire ( 1 ) in the heating press ( 2 ) - carrying out a first heating process step with a bladder ( 4 ) and a first heating medium, whereby the green tire ( 1 ) receives a first shaping - removal of the bladder ( 4 ) from the tire interior ( 9 ) of the green tire ( 1 ) - performing a bellows-free second heating process step in which a second heating medium directly into the tire interior ( 9 ) of the green tire ( 1 ) and - vulcanization of the green tire ( 1 ). Method according to claim 1, characterized in that that the first heating process step only for the Period of the molding and shaping process continues. Method according to claim 1 or 2, characterized that the first heating process step after completed in a period of essentially 2 to 5 minutes is. Method according to one of claims 1 to 3, characterized in that the bladder ( 4 ) after the first heating process step into a bellows well ( 3 ) of the heating press ( 2 ) is fed. Method according to one of claims 1 to 4, characterized in that the second heating medium by a separate in the bellows well ( 3 ) arranged supply line ( 7 ) is embedded in the tire interior. Method according to one of claims 1 to 5, characterized in that the bellows well ( 3 ) the retracted bladder ( 4 ) shields as far as possible from the second heating medium during the second heating process step. Method according to one of claims 1 to 6, characterized that the second heating process step at least partially outside the heating press performed becomes.