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Mold for tire

A tire and mold technology, applied in the field of gap molds, can solve problems such as poor gap width accuracy, and achieve the effects of uncomplicated structure, defect suppression, and high accuracy

Inactive Publication Date: 2014-03-26
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy of the gap width in this mold is poor

Method used

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  • Mold for tire
  • Mold for tire
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Experimental program
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Embodiment Construction

[0045] Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to appropriate drawings.

[0046] figure 1 It is a plan view showing a part of the tire mold 2 according to one embodiment of the present invention. figure 2 is along figure 1 The enlarged cross-sectional view of II-II. The die 2 includes a plurality of tread split dies 4 , a pair of upper and lower side plates 6 , and a pair of upper and lower bead rings 8 . The planar shape of the split mold 4 is substantially arc-shaped. A plurality of split dies 4 are arranged in a ring shape. The number of split molds 4 is generally 3 or more and 20 or less. The side plate 6 and the bead ring 8 are substantially annular. This mold 2 is a so-called "sheet mold".

[0047] image 3 yes means figure 1 A perspective view of the combined mold 4 of the mold 2. exist image 3 The X direction is the radial direction and the Y direction is the axial direction. The circumf...

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PUM

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Abstract

A tread segment of a mold includes a block (12). The block (12) has a cavity surface (14). The cavity surface (14) is formed by direct engraving. The block (12) has a base (20) and a core (22) subjected to enveloped casting by the base (20). The core (22) has a large number of pieces (24) and a large number of shims (30). Each piece (24) has a hole (32). A bolt (26) penetrates through the hole (32). The shim (30) is interposed between two adjacent pieces (24). By the shim (30), a slit is formed between the two adjacent pieces (24). The slit reaches the cavity surface (14). The shim (30) is positioned in the vicinity of a back face (36).

Description

technical field [0001] The present invention relates to a mold used in a tire vulcanization process, and more specifically, the present invention relates to a mold having a slit for exhausting air. Background technique [0002] Molds are generally used in the vulcanization process of tires. A sheet mold and two mold halves are used for this vulcanization process. During the vulcanization process, a preformed green tire is placed into a mold. The green tire is pressurized and heated in a cavity surrounded by a mold and an air bag. The rubber composition of the raw tire flows in the cavity by applying pressure and heat. Tires are obtained by heating rubber to produce a cross-linking reaction. During pressurization, if air remains between the cavity surface of the mold and the green tire, defects are formed on the surface of the tire. Defects degrade the quality of the tire. General molds have vent holes. Air is exhausted through the vent hole. [0003] The sheet mold h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C33/10B29C33/30B29C33/38B23P15/24B22D19/06B29D30/08B29C35/02B29C33/42B29L30/00
CPCB29D2030/0609B29D30/0606
Inventor 清水圭二冈野亨衣畑启神田雅彦
Owner SUMITOMO RUBBER IND LTD