tire vulcanization mold

A technology for vulcanizing molds and tires, which is applied to tires, household appliances, and other household appliances. It can solve the problems of poor fitting, time-consuming, and difficult formation of tire heel forming surfaces, and achieves suppression of inhalation and reduction of formation Effect

Active Publication Date: 2016-05-11
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the vent hole is processed using a tool such as a drill, it is difficult to form it on the curved heel forming surface g2 with a small curvature radius.
In addition, when a vent hole is provided, since part of the rubber is sucked together with the air, a whisker-like protrusion called extruded rubber is formed on the vulcanized bead part, so it is used to cut this Extruding glue takes time
In addition, since some protrusions remain after cutting, there is a problem that the protrusions have a bad influence on the fitting performance with the rim.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0062] In order to confirm the effect of the present invention, 100 pneumatic radial tires for passenger cars with a size of 215 / 45R17 were trial-produced according to the specifications in Table 1, and the appearance of the bead heel surface of the bead portion was investigated. Except for the parts described in the table, the rest are the same. The main common specifications are as follows.

[0063]

[0064] Arrangement number: 300 on the tire circumference

[0065]

[0066] The number of configurations: 12 configurations on the tire circumference

[0067] Circumferential angle θ1: 20 degrees

[0068] The aesthetic condition of the bead heel surface was judged in five stages using the following criteria by visual inspection and palpation by inspectors. The higher the value, the better.

[0069] 5: There is no covering or extruding glue, etc.

[0070] 4: Although there are some uncovered or extruded glue, etc., there is no need to repair and it is a tolerable level ...

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Abstract

The invention provides a tire curing mould which is helpful to reduce bad curing of no covering of a bead heel area of a tire bead part by improving a shape of a tire bead ring. The tire curing mould (M) comprises a tire bead ring (M3) including a tire bead forming surface (17). The tire bead ring (M3) is formed by more than two rings (R) which are formed by diving more than one diving plane (S) inside and outside in a tire, the more than one diving plane (S) extending from a tire bead heel area (4b) of a bead part (4). A dividing surface of the ring on one side is provided with a circumferential groove (26) extending along a circumferential direction; the circumferential groove (26) extends to the tire bead heel area (4b) and a plurality of slit forming grooves (27) of a discharge slit (E) having a gap (G) of 0.02-0.04 mm are formed between the circumferential groove (26) with the dividing surfaces of the rings on the other side. The rings configured on the outside of the tire axial outside is provided with a deflation opening (B) penetrating the rings on the outside for extending.

Description

technical field [0001] The present invention relates to a vulcanization mold for a tire that contributes to the reduction of poor vulcanization such as non-coverage of bead heel surfaces of bead portions by improving the structure of bead rings. Background technique [0002] Such as Figure 9 As shown in (a), the tire vulcanization mold m includes a tread forming part ma for forming a tread part, a sidewall forming part mb for forming a sidewall part, and a detachable tire for forming a bead part b. lip ring mc. Such as Figure 9 As shown in (b), the bead ring mc is formed to include a bead bottom forming surface g1 for forming the bead bottom surface b1 of the bead portion b of the tire, and a tire for forming the bead heel surface b2 of the bead portion b. The heel forming surface g2 and the outer forming surface g3 for forming the axially outer side b3 of the bead portion b. [0003] However, the above-mentioned bead forming surface g, such as Figure 9 As shown in (b),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C33/10B29C35/02B29L30/00
Inventor 杉山直树
Owner SUMITOMO RUBBER IND LTD
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