DE102013222662A1 - Multi-part vulcanizing mold for vulcanizing a green tire - Google Patents

Abstract

The invention relates to a multi-part vulcanizing mold for vulcanizing a green tire (12), with side wall shells (2, 4), bead rings (5) and with one of a number of segment shoes (7) composite segment ring (6), wherein the segment shoes (7) profile segments (8) holders, which with their molding surfaces (15) form and heat the tread region of the green tire (12) and which are movable apart in the radial direction (rR) and wherein an external heating for heating the profile segments (8) is provided, wherein the external heating can be charged with a heating medium. For targeted and timely temperature control of the mold segments (8), the outer heating for the tread area by heating channels (11) is formed, which are arranged in the interior of each profile segment (8) and which are fed with the heating medium oil.

Description

The invention relates to a multi-part vulcanizing mold for vulcanizing a green tire, with side wall shells, bead rings and with a segmented ring composed of a number of segment shoes, the segment shoes support profile segments which form and heat with their molding surfaces the tread region of the green tire and which apart in the radial direction are and wherein an external heating is provided for heating the profile segments, wherein the outer heating can be charged with a heating medium.

In a Vulkanisierform the green tires are heated from the outside on the profile segments, the side wall shells and the bead rings, these parts are heated by heating chambers, which are fed with at least one heating medium. The interior of the green tire is heated by means of a bladder, in which at least one gaseous or liquid heating medium is introduced under a certain pressure, and brought into its final form.

The heating chambers of the external heating are arranged in outer components of the vulcanization mold, so that the shaping components of the vulcanization mold such as profile segments, side wall shells and bead rings are not directly heated, but are heated by heat transfer from the heating chambers through various components. In the case of the profile segment, the heat transfer takes place, for example, from the heating chamber via the closing ring via the segment shoe to the profile segment.

The disadvantage is that the heat transfer through differently long paths from the heating chamber to each point of the molding surface of the profile segment is not uniform over the entire green tire tread, which can adversely affect the quality of the heat-pressed tire. In addition, the temperature control is cumbersome.

The invention is based on the object to provide a Vulkanisierform, in which the temperature control of the profile segments is targeted and timely control.

The object is achieved according to the invention in that the outer heating for the tread area is formed by heating channels, which are arranged in the interior of each profile segment and which are fed with the heating medium oil.

According to the invention, the external heating for the tread area is arranged directly in the shaping profile segment. The external heating has heating channels in the interior of the profile segment, which can be charged with tempered oil as the heating medium. As a result, the profile segments can be tempered directly and promptly. There is no need to transfer heat through various external components. The heating medium oil has various advantages, such as good temperature controllability and long-term usability.

The heating medium oil is heated outside the vulcanization mold, for example, and introduced into the heating channels arranged in the profile segments. The profile segment with the heating channels is produced, for example, by the SLM method (selective laser melting method) known to the person skilled in the art.

It is advantageous if the heating channels of a profile segment are elongated approximately in the tire circumferential direction and arranged one above the other in the axial direction and spaced from each other over the axial extent of the profile segment. By this arrangement of the heating channels, it is possible to specifically temper each area of the molding surface of the profile segment. The approximately in the circumferential direction heating channels allow a good medium flow.

It is expedient if the heating channels are arranged in the circumferential direction and in the axial direction parallel and at the same radial distance or at unequal radial distance from the molding surface. By this arrangement of the heating channels, it is possible to specifically temper each area of the molding surface of the profile segment.

In a particular embodiment of the invention, the heating channels are arranged in the axial direction at equal distances from one another.

In another embodiment of the invention, the heating channels are arranged in the axial direction at unequal distances from each other, wherein the heating channels are arranged in particular in areas with desired increased heating power at a smaller distance from each other. It is a targeted temperature control allows in the z. B. are the two shoulder regions of the tire, which are usually made thicker than the tread area to heat more.

It is advantageous if the heating channel has a diameter between 4 mm and 7 mm, preferably of about 5 mm.

In a particular embodiment of the invention, the heating channels of a profile segment are connected to each other. These can, for example, in the front region of the profile segment by means another channel be connected to each other or the channels are arranged in a serpentine manner in the profile segment. These heating channels can be charged with a single heating medium.

In another embodiment of the invention, the channels of a profile segment are not in communication with each other and can be charged with different tempered oils to heat in this way certain areas of the green tire with different temperature.

Further features, advantages and details of the invention will now be described with reference to the schematic drawing illustrating exemplary embodiments. Show

1 a sectional view of a part of a tire vulcanization mold in the closed state with a tire and

2 a three-dimensional representation of a profile segment of Vulkanisierform the 1 ,

1 schematically shows the essential components of a conventional Vulkanisierform or heating mold for a pneumatic vehicle tire for passenger cars. The Vulkanisierform is located within a heating press, whose components are not shown. Such a heating press usually comprises a press top and a press bottom and has the corresponding mechanisms for positioning the tire to be vulcanized, for operating the components of the vulcanization mold, for introducing the heating media and for removing the finished vulcanized tire.

In the 1 Vulkanisierform shown is a multipart container shape with a lower heating plate 1 , a lower sidewall shell 2 , an upper heating plate 3 , an upper sidewall shell 4 and a bead ring 5 , Those components of the vulcanization mold which are moved in the vertical direction (arrow P1) for opening and closing include the upper heating plate 3 with the arranged on this upper side wall shell 4 , The vulcanization mold further comprises a segment ring 6 on, which is usually from six to nine annular segment shoes 7 is composed, which radially inwardly depending on a shaping profile segment 8th holders. The segment shoes 7 when opening the Vulkanisierform radially, in the direction of arrow P2 in 1 , pulled apart and thus release the finished vulcanized tire. The profile segments 8th mold the tread of the tire. At the upper heating plate 3 is a locking ring 9 arranged, which has a beveled inner surface, which with bevelled outer surfaces of the segment shoes 7 of the segment ring 6 act together so that when closing the vulcanization form the segment shoes 7 in the radial direction to the closed segment ring 6 be moved together. In the lower heating plate 1 and the upper heating plate 3 are heating chambers 10 in which for vulcanizing the tire at least one heating medium, in particular saturated steam (steam) is introduced. In addition, inside each profile segment 8th heating channels 11 arranged, in which tempered as a heating medium oil is introduced. That's how the green tire gets 12 from the outside through the profile segments 8th directly and over the sidewall shells 2 . 4 and the bead rings 5 indirectly heated by heat transfer. This heater is commonly referred to as outdoor heating. The in the lower and the upper heating plate 1 . 3 contained heating chambers 10 essentially heat the side areas and bead areas of the green tire 12 , the profile segments 8th warm the tread area.

In 1 is also a common bladder 14 shown, which is arranged in a known manner and is filled with at least one heating medium under pressure to the green tire 12 to center in the form of the inside, with the bladder 14 is brought into a mature Torusform. After the green tire 12 over the bladder 14 is heated from the inside, this type of heating is referred to as internal heating.

The 2 shows a three-dimensional representation of a profile segment of the Vulkanisierform the 1 , The heating channels 11 of the profile segment 8th are longitudinally extended in the tire circumferential direction uR and in the axial direction aR one above the other, spaced apart from each other over the axial extent of the profile segment 8th arranged. The heating channels 11 are in the circumferential direction uR and in the axial direction aR parallel to the molding surface 15 and at equal distances from each other and at equal distances from the molding surface 15 arranged. A heating channel 11 has a diameter 13 of about 5 mm. The heating channels 11 a profile segment 8th communicate with each other.

LIST OF REFERENCE NUMBERS

1

lower heating plate

2

lower side wall shell

3

upper heating plate

4

upper side wall shell

5

bead

6

segment ring

7

segment Shoe

8th

profile segment

9

locking ring

10

heating chamber

11

heating duct

12

green tire

13

Diameter of a heating channel

14

bladder

15

Shaping surface of the profile segment

Claims (8)

Multi-part vulcanizing mold for vulcanizing a green tire ( 12 ), with side wall shells ( 2 . 4 ), Wulstringen ( 5 ) and one of a number of segment shoes ( 7 ) composite segment ring ( 6 ), the segment shoes ( 7 ) Profile segments ( 8th ), which with their forming surfaces ( 15 ) the tread area of the green tire ( 12 ) and which are movable apart in the radial direction (rR) and wherein an external heating for heating the profile segments ( 8th ), wherein the external heating is chargeable with a heating medium, characterized in that the external heating for the tread area by heating channels ( 11 ) formed inside each profile segment ( 8th ) are arranged and which are fed with the heating medium oil. Vulkanisierform according to claim 1, characterized in that the heating channels ( 11 ) of a profile segment ( 8th ) in the tire circumferential direction (uR) longitudinally and in the axial direction (aR) spaced from each other over the axial extent of the profile segment ( 8th ) are arranged. Vulcanizing mold according to one or more of the preceding claims, characterized in that the heating channels ( 11 ) in the circumferential direction (uR) and in the axial direction (aR) parallel to the molding surface ( 15 ) are arranged. Vulkanisierform according to claim 2, characterized in that the heating channels ( 11 ) are arranged in the axial direction (aR) at equal distances from each other. Vulkanisierform according to claim 2, characterized in that the heating channels ( 11 ) are arranged in the axial direction (aR) at unequal distances from each other, wherein the heating channels ( 11 ) are arranged at a smaller distance from each other, in particular in areas with desired increased heating power. Vulkanisierform according to one or more of the preceding claims, characterized in that the heating channel ( 11 ) a diameter ( 13 ) between 4 mm and 7 mm, preferably about 5 mm. Vulcanizing mold according to one or more of the preceding claims, characterized in that the heating channels ( 11 ) of a profile segment ( 8th ) communicate with each other. Vulkanisierform according to one or more of the preceding claims 1 to 6, characterized in that the heating channels ( 11 ) of a profile segment ( 8th ) are not related to each other.

Images