WO2016015927A1

WO2016015927A1 - Vulcanizing mold for vulcanizing vehicle tires, and method for producing a vulcanizing mold

Info

Publication number: WO2016015927A1
Application number: PCT/EP2015/064326
Authority: WO
Inventors: Joharsyah Ciptokusumo; Paula Prochnow
Original assignee: Continental Reifen Deutschland Gmbh
Priority date: 2014-08-01
Filing date: 2015-06-25
Publication date: 2016-02-04

Abstract

The invention relates to a vulcanizing mold (1) for vulcanizing vehicle tires, having a plurality of mold segments (2) that can be joined together to form a circumferentially closed mold. Radially inwards, each mold segment (2) is provided with a mold surface (3) having a negative tread profile provided with negative profile elements (6) for forming the positive tread profile having positive profile elements of the vehicle tire to be vulcanized, wherein the mold surface (3) is provided with narrow venting gaps (9) for venting air from the mold cavity. An essential feature of the invention is that the vulcanizing mold is a casting mold having integral mold segments (2), and into which the venting gaps (9) can be inserted at a later time. The invention further relates to a method for producing a segmented vulcanizing mold.

Description

description

VULCANIZATION FOR THE VULCANISING OF VEHICLE TIRES AND METHOD FOR PRODUCING A VULCANIZATION FORM

The invention relates to a Vulkanisierform for vulcanizing vehicle tires, with a plurality, together to a circumferentially closed form movable

Mold segments, each mold segment radially inside a mold surface having a negative tread profile with negative profile elements for forming the positive tread profile with positive profile elements of the vehicle tire to be vulcanized and wherein the forming surface has narrow venting column for discharging the air from the mold cavity. The invention also relates to a process for producing an aforementioned vulcanizing mold.

The tire vulcanization is carried out in heating presses, in which the green tire is used in suitable Vulkanisierformen and vulcanized under the action of heat and pressure. Tire vulcanizing molds include mold segments which together form the radially outer surface of the tire, such as the tread and the shoulder region, while other segments form the wider regions of the tire. The unvulcanized green green tire is heat pressed in the vulcanization mold and converted to its final rubbery state by rubber crosslinking reactions. The tire receives its profile and sidewall design by the corresponding negative design of the molding surfaces of the mold segments. It is important in the tire vulcanization that the trapped air within the mold cavity does not affect the manufacturing quality of the vehicle tire when moving together the mold segments. The mold segments of the vehicle tire vulcanizing molds are made of metal, usually steel or aluminum.

A Vulkanisierform according to the preamble has become known from the previously unpublished DE 10 2012 109 723. The vulcanizing mold is a milled mold in which the molding surfaces of the mold segments are at least in the central region of the negative tread pattern puzzle pieces composed of part-shaped segments with division in the circumferential direction. In this case, all partial mold segments can be arranged interchangeably or else both fixed and exchangeable within the mold segment. The columns of contiguous sub-shape segments are designed as venting gaps which communicate with the atmosphere. Such

Vulcanization mold has advantages in terms of venting performance. The sum of the gap lengths is increased over conventional circular venting means, whereby the venting is improved. It can be removed more air volume per unit time and air pockets, which would reduce the manufacturing quality of the tire are reliably avoided.

However, the aforementioned vulcanizing molds are produced by milling. On the one hand this is expensive in terms of production, on the other hand, the cleaning of a milled form is very complex, since the individual parts of the mold are taken apart for cleaning and must be reassembled for cleaning after use. Because of these disadvantages, milled forms are usually not for the

Series production but used only for test tires.

The invention is therefore an object of the invention to provide a cost-effective Vulkanisierform with deaerators, which is easy to clean and which is suitable for the mass production of vehicle tires. The object is achieved according to the preamble and the characterizing feature of claim 1, characterized in that the Vulkanisierform is a mold, the mold segments are integral and in which the venting column are introduced later.

Molds are generally well suited for the standard shapes of vehicle tires. By means of a casting model many forms can be manufactured inexpensively. By the subsequent introduction of the venting column in the mold surface of the one-piece casting mold segments by means of suitable processes, the vulcanizing mold need not be assembled from milled part-mold segments. The venting gaps of the mold surfaces are in communication with other means for removing air from the mold

Mold cavity to pass through the mold segments radially outward. This is also advantageous in terms of cleaning the vulcanization mold. segmented

Vulkanisierformen usually consist of 9 to 17 molding segments, wherein

Passenger car tire molds usually consist of 9 - 11 mold segments and commercial vehicle tire molds usually consisting of 9 - 17 mold segments. If the cleaning time, including assembly time for milled shapes for a (puzzle) mold segment about 2 hours, you need for the cleaning of the entire casting according to the mold only 2 hours.

It is advantageous if the venting column are the only venting means within the molding surface. On deaerating agents such as cylindrical

Vent holes or closable valves is omitted. The optical

The appearance of the vulcanized tire is improved. In addition, it has been shown that both the winter performance of a vulcanized winter tire and the dry and wet handling performance of a vulcanized summer tire are improved. In addition, eliminates a high maintenance for Ventilentantungsmittel.

It is advantageous if the venting gap has a width of 30 μm to 130 μm, preferably of 50 μm to 80 μm. The width of the vent slot is measured perpendicular to its longitudinal extent. The aforementioned width grants one adequate venting, however, the penetration of rubber material of the tire is avoided in the vent slot, so that no heat or barely ejected arise on the heat-pressed tire. In addition, the vent slot does not dirty or clogged or barely.

It is advantageous if the vent gap has a length of 5 mm to 250 mm, so that the fiction, contemporary ventilation concept can be flexibly constructed. The vent slot may have different shape. It is expedient if the venting gap has a depth of 1.5 mm to 15 mm, preferably 2 mm to 4 mm. This depth provides an optimal compromise between low manufacturing costs due to the lowest possible depth of the venting gap and the resistance to deflection, achieved by a

Minimum depth, dar.

For a reliable ventilation over the entire profile width the venting column in the central region of the negative tread pattern are arranged circumferentially and the venting gaps in the shoulder region of the negative tread pattern are arranged transversely to the circumferential direction. The central area is the one immediately adjacent to the two shoulder areas.

It is expedient if the venting gap in the shoulder region is arranged immediately adjacent and parallel to a negative groove which forms a groove in the profile positive of the tire, wherein the negative groove preferably forms a transverse groove in the profile positive. "Adjacent" means a distance between 0.5mm and 2mm of the vent slot to the nearest land measured perpendicular to this land so that the air can be well drained from the spaces between lands.

It is expedient if the venting gap opens radially outward (toward the outside of the vulcanization mold) into a venting channel whose cross-sectional area is greater than the cross-sectional area of the venting gap and whose diameter is preferably 2 mm to 3 mm. This can be at a pending cleaning the Vulkanisierform the venting gap can be easily blown from the outside, with a possibly existing rubber residue can be expelled without residue as a plug.

It is advantageous if the venting gap has the same width over its longitudinal extent, preferably over its longitudinal extent and over its depth extent, so that a venting bore can be specifically set from the rear side of the mold.

The invention also relates to a vehicle tire which is vulcanized according to an aforementioned Vulkanisierform.

The invention also relates to a method for producing a segmented

Vulkanisierform, which has for venting the mold cavity vents in the mold surfaces. The invention is characterized in that one uses a mold in which one subsequently introduces the venting column. For this purpose, the water laser method and / or a laser method and / or an electron beam method are used for the subsequent introduction of the ventilation gaps.

Further advantages, features and details of the invention are explained in more detail in the figures, which illustrate embodiments. It show the:

Fig. 1 is a segmented Vulkanisierform with mold segments;

FIG. 2 is a perspective view of the forming surface of a mold segment; FIG.

Fig. 3 shows a cross section of a vent slot including venting channel along the

Section A-A of Fig. 2;

4 shows a longitudinal section of the venting slot together with the venting channel of FIG. 3

along the section B-B of Fig. 2;

5 shows a longitudinal section of another vent slot including venting channel. Fig. 6a is a radial section through a mold segment of a vulcanizing mold of the prior art; Fig. 6b is a radial section through a mold segment of an inventive

Vulcanizing mold.

In Fig.l is a simplified schematic representation of a segmented

Vulcanization mold 1 for vehicle tires 4 with several, to one circumferentially

closed form joinable form segments 2 shown. The mold segments 2 are radially movable and form radially inside a mold cavity. The mold segments 2 have on the inside forming surfaces 3. The mold segments 2 continue to have

Venting means 5 (not shown), which are in communication with the atmosphere and through which gas from the mold cavity of the vulcanizing mold 1 through the mold segment 2 can be discharged to the outside.

FIG. 2 shows a perspective view of the molding surface 3 of a molding segment 2. The molding surface 3 has a negative tread profile with negative profile elements 6 for forming the positive tread profile with positive profile elements of FIG

vulcanizing vehicle tire on. The negative grooves 7 form in the mold surface 3 of the mold segment 2 webs. The vulcanizing mold 1 is a casting mold so that the molding segments 2 are integral. Narrow vent gaps 9 have subsequently been introduced into the mold surface in the mold surface 3 by the water-laser method or a comparable method, which forms a venting means associated with the atmosphere by further means. There are eleven venting column 9 arranged in the central region 10 of the tread negative in the circumferential direction. In the shoulder region 11 of the forming surface 2 are the

Venting column 9 also disposed within the negative profile elements 6. On other venting agents such as Eurovents or cylindrical

Vent holes are omitted. The venting gaps 9 are preferably adjacent, here at a distance of 1 mm and parallel to the webs 18, which form incisions in the profile positive of the tire arranged. The surface of the venting column 9 of a Negative profile element 6 is about 5-15% of the surface of the negative profile element. 6

FIG. 3 shows a cross section of a venting gap 9 together with venting channel 12 along the section A - A of FIG. 2, while FIG. 4 shows the longitudinal section along the section B - B. The vent gap 9 has a width b of 30 μιη to 130 μιη, preferably from 50 μιη to 80 μιη. The venting gap 9 opens into the

Venting channel 12, whose cross-sectional area is round and larger than the cross-sectional area of the venting gap 9. The diameter d of the venting channel 12 is between 2 mm and 3 mm.

The venting gap 9 has a radial depth extension t of 1.5 mm to 15 mm and the venting channel 12 has a radial depth extension 14 of 10 mm to 15 mm. Over the longitudinal extent of the venting gap 10 and over its

Depth extension 14 remains the same width b. The length 1 of the venting gap is between 10 mm and 40 mm.

5 shows a longitudinal section of another venting gap 9 together

Venting channel 12. The longitudinal section of this venting means 5 differs from that of Fig. 4 in that the lower surface of the venting gap 16 funnel-shaped merges into the venting channel 12, while the lower surface of the venting gap 16 of FIG. 4 parallel to the axial direction aR running as a straight line is formed. 6a shows a radial section through a mold segment 2 of a vulcanizing mold 1 of the prior art, while FIG. 6b shows a radial section through a mold segment 2 of a vulcanizing mold 1 according to the invention. While the milled Vulkanisierform 1 of the prior art complex attachment means 17 of the individual partial mold segments 18, these are in the fiction, contemporary Vulkanisierform 1 due to the one-piece casting mold segment, in which the vent slots (not shown) subsequently, ie after casting, have been introduced, advantageously not necessary.

LIST OF REFERENCE NUMBERS

(Part of the description)

1 vulcanizing mold

2 mold segment

3 mold surface

4 vehicle tires

6 negative profile element

7 negative groove

9 venting gap

10 Central area of the tread

11 Shoulder area of the tread

12 venting channel

14 Depth Extension Venting duct

16 Lower surface of the vent slot

17 fasteners

18 partial shape segment

Wide venting gap Length Venting gap Deep venting gap

Diameter bleed passage rR radial direction aR axial direction uR circumferential direction

Claims

claims

1. vulcanizing mold (1) for vulcanizing vehicle tires,

with a plurality of mold segments (2) which can be moved together in a circumferentially closed form, wherein each mold segment (2) has a radially inner forming surface (3) with a negative tread profile with negative profile elements (6) for forming the positive tread profile with positive profile elements of the vehicle tire to be vulcanized, and wherein the forming surface (3) has narrow venting gaps (9) for discharging the air from the mold cavity,

characterized in that

the vulcanizing mold is a casting mold whose mold segments (2) are integral and in which the venting gaps (9) are subsequently introduced.

2. vulcanizing mold according to claim 1,

characterized in that the venting column (9) are the only venting means within the forming surface (3).

3. Vulkanisierform (1) according to one or more of the preceding claims, characterized in that the venting gap (9) has a width (b) of 30 μιη to 130 μιη, preferably from 50 μιη to 80 μιη.

4. Vulkanisierform (1) according to one or more of the preceding claims, characterized in that the venting gap (9) has a length (1) of 5 mm to 250 mm.

5. vulcanizing mold (1) according to one or more of the preceding claims, characterized in that the venting gap (9) has a depth (t) of 1.5 mm to 15 mm.

6. Vulkanisierform (1) according to one or more of the preceding claims, characterized in that the venting gaps (9) in the central region (10) of the negative tread pattern are arranged circumferentially and that the venting column (9) in Shoulder region (11) of the negative tread pattern are arranged transversely to the circumferential direction.

7. Vulkanisierform (1) according to claim 6, characterized in that the

Ventilation gap (9) in the shoulder region (11) immediately adjacent and parallel to a negative groove (7), which forms a groove in the profile positive of the tire is arranged, wherein the negative groove (7) is preferably a transverse groove in the

Profile positive shapes.

8. Vulkanisierform (1) according to one or more of the preceding claims, characterized in that the venting gap (9) opens into a venting channel (12) whose cross-sectional area is greater than the cross-sectional area of the venting gap (9) and whose diameter (d) preferably 2 mm to 3 mm.

9. vulcanizing mold (1) according to one or more of the preceding claims, characterized in that the venting gap (9) over its longitudinal extension (15), preferably over its longitudinal extension (15) and over its depth extension (13), the same width (b ) having.

10. Vehicle tire (4), characterized in that it has been vulcanized with a vulcanizing mold (1) according to one or more of claims 1-9.

1 1. Process for producing a segmented vulcanizing mold (1), which is assigned to

Ventilation of the mold cavity ventilation gaps (9) in the mold surfaces (3), characterized in that one uses a mold, in which one subsequently introduces the venting column (9) according to one or meherer of claims 3-9.

12. The method according to claim 10,

characterized in that the subsequent introduction of the

Venting column (9) the water laser method and / or a laser method and / or an electron beam method applies.