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Method of molding hollow component with high strength and sealability and the hollow component

A molding method and technology of molded parts, which can be used in hollow objects, household components, transportation and packaging, etc., and can solve problems such as difficulty in ensuring sealing performance

Active Publication Date: 2005-02-02
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, in the conventional technology, there is such a defect that the weld strength of the welded part of the hollow molded part tends to vary along the length direction of the resin flow path, making it difficult to ensure stable sealing performance

Method used

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  • Method of molding hollow component with high strength and sealability and the hollow component
  • Method of molding hollow component with high strength and sealability and the hollow component
  • Method of molding hollow component with high strength and sealability and the hollow component

Examples

Experimental program
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Effect test

no. 1 example

[0066] Fig. 1 is a schematic cross-sectional view of the structure of a mold A for producing a hollow molded article 3 according to a first embodiment of the present invention. FIG. 2 is a schematic sectional view of the overall structure of the hollow molding 3 . Figures 3 to 12 is a sectional view of the mold A in each molding step for explaining the hollow molded article molding method.

[0067] As shown in FIG. 2, the hollow molding 3 according to the present embodiment has a hollow structure including a plurality of openings. The divided body 31 having the opening 311 and the divided body 32 having the openings 321, 322 are integrally welded to each other by filling the peripheral resin 33 along the outer circumference of the contact portion between the annular contact surfaces 313, 323 to form In the grooves 314, 324 (located in the peripheral path 330 for providing the resin path according to the present embodiment as described later). The composition of the welded p...

no. 2 example

[0147] Refer below Figure 19 A second embodiment of the present invention is described. According to the second embodiment, the protrusion has a different shape than in the first embodiment. In the second embodiment, the same constituent parts as those in the first embodiment are respectively denoted by the same reference numerals, and description thereof will not be repeated.

[0148] Figure 19 is a sectional view of main parts in the flow path forming step (corresponding to that of the first embodiment Figure 15 ). Such as Figure 19 As shown, the protruding portion 326A has a triangular cross-section in a direction at right angles to the length direction of the resin path 330, and the surface / volume ratio of the front end portion (the upper part in the figure) of the protruding portion 326A near the center of the peripheral edge path 330 is much larger than its root (lower part in the figure). Further, like the protrusions 316 , 326 in the first embodiment, the pro...

no. 3 example

[0154] Refer below Figure 20 A third embodiment of the present invention is described. The third embodiment differs from the first embodiment in that, according to the third embodiment, an insulating structure is formed in the peripheral path. exist Figure 20 In , the same components as those in the first embodiment are denoted by the same reference numerals, respectively, and description thereof will not be repeated.

[0155] Figure 20 is a sectional view of main parts in the flow path forming step (corresponding to that of the first embodiment Figure 15 ), as shown in the figure, the split body 32 is formed with a wall portion 328 at a position closer to the outer periphery than the protruding portion 326 and in contact with the slide mold 24 . The wall portion 328 has almost the same height as the protrusion 326 and extends longitudinally along the peripheral path 326 . Although not shown, the wall portion of the divided body 31 is formed in the same manner as the ...

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PUM

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Abstract

Division members (31, 32) separately molded to form a hollow component are brought into contact with each other and are arranged in dies (14, 24). The peripheral edge of the contact parts is formed with a peripheral edge path (330) to be filled with a molten resin. In the peripheral edge path (330), protrusions (316, 326) are projected from the division members (31, 32) continuously over the whole periphery of the peripheral edge path (330). The molten resin is filled in the peripheral edge path 330, and is welded with the protrusions (316, 326). As a result, a weld structure is obtained in which portions having a high welding strength are continuously formed over the whole periphery of the peripheral edge path (330).

Description

technical field [0001] The present invention relates to a method of forming a hollow molded part by welding a plurality of divided bodies, and a hollow molded part formed by the forming method. Background technique [0002] A conventional method of forming a hollow molded article is disclosed in Japanese Patent Application Laid-Open No. 7-75870 (Reference 1). In this conventional method, a plurality of divided bodies for constituting a desired hollow molded article are molded independently of each other, and then contact each other in one mold. Molten resin is injected and filled into resin paths formed along the periphery of each of the contacted divided bodies, and the divided bodies are welded to each other by the filled resin, thereby molding a hollow molded article. [0003] The surface of each divided body on which the resin path is formed is uneven in a direction at right angles to the length direction of the resin path, so that the resin path is curved in the longit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/16B29C45/00B29C65/00B29C65/70B29C65/78B29L22/00
CPCB29C66/1312B29C66/30321B29C66/3242B29C66/54B29C65/7802B29C45/0062B29C66/324B29C65/70B29C65/7814B29L2031/7172Y10T428/13
Inventor 荒井毅永井清美伊藤尚之长田喜芳
Owner DENSO CORP