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Method for forming duct made of elastomer

A pipe and elastic technology, applied in the field of pipes of air pipes and corrugated pipes, can solve the problems of damaged products, lower product quality, insufficient, etc., and achieve the effect of avoiding damage and easy removal

Inactive Publication Date: 2006-09-20
TAIGAASU HORIMAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the resin pipe is considerably insufficient in elasticity compared to the rubber pipe, there is also a problem that the resin pipe cannot be smoothly removed from the mandrel depending on the position and number of designed corrugated sections.
Moreover, the forced removal of the pipes from the mandrel encounters new problems of damaging the product, resulting in reduced product quality

Method used

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  • Method for forming duct made of elastomer
  • Method for forming duct made of elastomer
  • Method for forming duct made of elastomer

Examples

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Embodiment Construction

[0030] figure 1 is a cross-sectional side elevational view of the resin pipe 1 injection-molded into a shape bent in a given direction. This duct serves as an air duct connecting the engine body of the automobile to an air cleaner (not shown), and has a corrugated section (or corrugated section) 2 near the middle part of the duct as a part in the longitudinal direction, and the corrugated section 2 A plurality of protrusions or peaks 3 formed with a large diameter and a plurality of depressions or valleys 4 with a small diameter are alternately arranged along the axial center direction of the pipe. Both ends 5a and 5b of the pipe 1 are formed in non-corrugated sections with almost smooth surfaces, and are connected and fixed to the engine body or the air cleaner by clamps (not shown). Incidentally, symbols 6 and 6 show reinforcing ribs formed continuously and integrally along the circumferential direction of the peripheral surface in the vicinity of the end portions 5a and 5b...

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Abstract

In a method for forming a duct used as, e.g., an air duct for an automobile engine, and provided with a corrugated section as an undercut part in a part of the longitudinal direction of the duct, an elastomeric duct is formed with ensuring easy removal of a duct molded by injection from a core die even when the duct is made of a resin poor in elasticity. [Means to Solve the Problems] A method for forming an elastomeric duct having a corrugated section in a longitudinal direction thereof as a part of the duct by injection molding, which comprises injecting an elastomer material into a cavity formed with a cavity die for forming an external surface of the duct, and a core die for forming an internal surface of the duct, wherein the core die is a splittable core die which is axially splittable into two parts, one is a core die A for forming a duct area at least containing the corrugated section, and the other is a core die B for forming a duct area free from the corrugated section, and removing the duct area containing the corrugated section from the core die A with expanding at least the corrugated section in the radius direction by air injection after opening the cavity die.

Description

technical field [0001] The invention relates to a method for forming or producing elastic ducts or ducts made of elastomers such as rubber or thermoplastic elastomers, for example as ducts for supplying air from an air filter to an engine (such as for the air intake duct of a car engine). In particular, the invention relates to pipes comprising corrugated sections as undercuts at a part of the longitudinal direction. Background technique [0002] Previously, as the pipes described above, rubber pipes that are injection molded pieces of vulcanized rubber material have been used. However, this rubber pipe has some problems in that the rubber pipe is heavier than the resin pipe and the rubber pipe cannot be recycled. In recent years, in order to solve these problems, air ducts that are injection molded pieces formed of thermoplastic elastomers are in practical use. This resin air duct is described in detail in Patent Document 1, for example. Patent Document 1: Japanese Pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/44F02M35/10B29C45/43
CPCF02M35/10347F02M35/10321B29K2021/00B29L2016/00F02M35/10137B29C45/435
Inventor 高田诚一郎大森直树
Owner TAIGAASU HORIMAA
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