WO2001094095A1 - Procede de fabrication de tuyaux pour des applications hydrauliques, automobiles, industrielles et similaires - Google Patents

Procede de fabrication de tuyaux pour des applications hydrauliques, automobiles, industrielles et similaires Download PDF

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Publication number
WO2001094095A1
WO2001094095A1 PCT/EP2000/005352 EP0005352W WO0194095A1 WO 2001094095 A1 WO2001094095 A1 WO 2001094095A1 EP 0005352 W EP0005352 W EP 0005352W WO 0194095 A1 WO0194095 A1 WO 0194095A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner layer
steel reinforcement
hose
rubber
over
Prior art date
Application number
PCT/EP2000/005352
Other languages
English (en)
Inventor
Paolo Seghi
Original Assignee
Manuli Rubber Industries S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Manuli Rubber Industries S.P.A. filed Critical Manuli Rubber Industries S.P.A.
Priority to AU55315/00A priority Critical patent/AU5531500A/en
Priority to MXPA02001470A priority patent/MXPA02001470A/es
Priority to PCT/EP2000/005352 priority patent/WO2001094095A1/fr
Priority to PL00352105A priority patent/PL194553B1/pl
Publication of WO2001094095A1 publication Critical patent/WO2001094095A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/085—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more braided layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B29C48/152—Coating hollow articles the inner surfaces thereof
    • B29C48/153—Coating both inner and outer surfaces

Definitions

  • the present invention relates to a method for producing hoses for 5 hydraulic, industrial, automotive applications and the like. More particularly, the invention relates to a method for producing rubber hoses having an intermediate metal braiding, particularly for hydraulic, industrial, automotive applications and the like.
  • the methods currently used to manufacture said hoses entail a plurality of steps performed sequentially, starting from the extrusion of a generally is flexible mandrel (also known as core) which is then used as a support on which the rubber inner layer is extruded.
  • the inner layer is the component that is designed to contain the fluid, while the braided steel reinforcement is the structural element of the hose which is capable of withstanding the operating pressure, so A rubber sheath, designed to protect the hose from external agents, is then extruded over the braided steel reinforcement.
  • a wrapping step is then performed in order to avoid the mutual contact of the crude rubber and apply circumferential pressure to the hose during vulcanization.
  • Alternative technologies can be provided. Vulcanization and unwrapping then follow.
  • the hose thus completed is ready to be tested after removing the flexible mandrel inserted therein.
  • L5 mandrel is extracted, the formation of longitudinal scoring on the inner layer, dents in the inner layer due to imperfections of the mandrel, and the presence of non-stick product residues which remain attached inside the hose after the mandrel has been removed.
  • the wrapping process for performing vulcanization entails so wrinkles, denting of the rubber sheath of the hose, molding of the seams of the bandages on the sheath of the hose, torsion of the hose due to incorrect wrapping, etcetera.
  • the aim of the present invention is therefore to provide a method for producing hoses for hydraulic, industrial, automotive applications and the like which allows a substantial reduction in the number of manufacturing steps to be carried out in order to produce the hose.
  • an object of the present invention is to so provide a method for producing hoses for hydraulic, industrial, automotive applications and the like which allows a reduction in the cycle time required to produce the hose.
  • Another object of the present invention is to provide a method for producing hoses for hydraulic, industrial, automotive applications and the like in which it is not necessary to use additional materials such as mandrels, non-stick products, vulcanization bandages and the like, in order to reduce environmental impact and to improve workplace safety conditions.
  • Another object of the present invention is to provide a method for producing hoses for hydraulic, industrial, automotive applications and the like in which the resulting hose is substantially free from the defects that can be noted when using known methods, in order to improve the quality level of the product.
  • Another object of the present invention is to provide a method for producing hoses for hydraulic, industrial, automotive applications and the like which is highly reliable, relatively easy to manufacture and at competitive costs.
  • a method for producing hoses for hydraulic, industrial, automotive applications and the like characterized in that it comprises the steps of: extruding a rubber inner layer without an internal supporting mandrel; applying a braided steel reinforcement over said inner layer; extruding a rubber sheath around said braided steel reinforcement and vulcanizing the resulting rubber hose.
  • the method according to the invention entails a first step for extruding a rubber inner layer 1 of a hose 10 without using a generally flexible inner mandrel (as occurs in conventional methods) and without using the corresponding release agents, i.e., non-stick products which allow to subsequently remove the mandrel from the hose.
  • the rubber inner layer 1 is therefore produced without using the mandrel.
  • the inner layer 1 is arranged on a collecting surface, and a fluid (gas or liquid) can be injected into it in order to increase its collapse resistance.
  • a braided steel reinforcement 2 (with one or two braids) is applied, having the following particular characteristics:
  • the cooling of the inner layer entails a hardening of the rubber of the inner layer and therefore provides greater resistance of the inner layer when the steel braiding is applied thereon;
  • ⁇ optional pressurization of the inner layer by means of a fluid can be applied in order to increase the squeezing resistance of the hose.
  • one or more textile threads or metallic strands 3 are deposited longitudinally along the hose 10 and give the inner layer 1 a longitudinal rigidity which, together with cooling and braid tension reduction, prevents the longitudinal deformation of the inner layer 1, allowing to comply with the braiding parameters (pitch, angle, lay diameter).
  • a step for extruding a rubber covering 4 and for vulcanizing the resulting hose is performed.
  • the vulcanization step can be performed separately from the step for extruding the rubber covering but so as to be integrated in the industrial timing and handling or directly on-line with respect to the extrusion step.
  • the type of vulcanization provided is preferably the open-steam technology; alternative technologies (microwaves, hot air, molten salts, et o cetera) can optionally be used as a replacement or as an addition.
  • the reduction in the number of steps further allows to reduce the number of machines and therefore allows greater possibilities to automate the process.
  • the resulting product i.e., the hose 10 with steel reinforcements, is free from recurring defects caused by use of the inner mandrel.
  • S5 fact does not have the longitudinal scoring on the inner layer 1 that are normally produced during mandrel extraction, the dents in the inner layer caused by imperfections of the mandrel, residues of non-stick products caused by the presence of the mandrel, etcetera.
  • the wrapping step which is not present in the method according to the 50 invention, therefore also no longer causes the above described defects, such as wrinkles, dents on the rubber sheath, molding of the seams of the bandages onto the sheath of the hose, torsion of the hose due to poor wrapping, etcetera.
  • the fact of eliminating the inner mandrel and the wrapping 5 of the hose for vulcanization entails an advantage in terms of quality of the final product.
  • a rubber inner layer 1 which has a medium-high hardness (generally > 85 Shore A);
  • the step for extruding the rubber sheath 4 that overlaps the steel braiding 2, associated with the vulcanization step, as mentioned, can be performed separately from the vulcanization step; specifically, the step for extruding the rubber sheath 4 can be performed before the vulcanization step, as normally known in the art. All the details may furthermore be replaced with other technically equivalent elements.
  • the materials used may be any according to requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

L'invention concerne un procédé de fabrication de tuyaux (10) pour des applications hydrauliques, automobiles, industrielles et similaires, comprenant les opérations suivantes : extruder une couche intérieure (1) de caoutchouc sans mandrin support intérieur, appliquer un renfort (2) d'acier torsadé sur la couche intérieure, extruder une gaine (4) de caoutchouc autour du renfort (2) d'acier torsadé et vulcaniser le tuyau en caoutchouc (10) ainsi façonné.
PCT/EP2000/005352 2000-06-09 2000-06-09 Procede de fabrication de tuyaux pour des applications hydrauliques, automobiles, industrielles et similaires WO2001094095A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU55315/00A AU5531500A (en) 2000-06-09 2000-06-09 Method for producing hoses for hydraulic, industrial, automotive applications and the like
MXPA02001470A MXPA02001470A (es) 2000-06-09 2000-06-09 Metodo para producir mangueras para aplicaciones hidraulicas, industriales, automotrices y similares.
PCT/EP2000/005352 WO2001094095A1 (fr) 2000-06-09 2000-06-09 Procede de fabrication de tuyaux pour des applications hydrauliques, automobiles, industrielles et similaires
PL00352105A PL194553B1 (pl) 2000-06-09 2000-06-09 Sposób wytwarzania przewodów giętkich do zastosowań hydraulicznych, przemysłowych i motoryzacyjnych oraz przewód giętki do zastosowań hydraulicznych, przemysłowych i motoryzacyjnych

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2000/005352 WO2001094095A1 (fr) 2000-06-09 2000-06-09 Procede de fabrication de tuyaux pour des applications hydrauliques, automobiles, industrielles et similaires

Publications (1)

Publication Number Publication Date
WO2001094095A1 true WO2001094095A1 (fr) 2001-12-13

Family

ID=8163982

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/005352 WO2001094095A1 (fr) 2000-06-09 2000-06-09 Procede de fabrication de tuyaux pour des applications hydrauliques, automobiles, industrielles et similaires

Country Status (3)

Country Link
AU (1) AU5531500A (fr)
MX (1) MXPA02001470A (fr)
WO (1) WO2001094095A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2013911A1 (fr) * 1968-07-29 1970-04-10 Angus George Co Ltd
JPS5022073B1 (fr) * 1969-03-14 1975-07-28
US4112031A (en) * 1975-07-23 1978-09-05 Paul Troester Maschinenfabrik Process and apparatus for producing rubber hose with textile thread reinforcing
DE2841142A1 (de) * 1977-09-21 1979-03-29 Dunlop Ltd Verstaerkte rohrfoermige gegenstaende
JPS55107443A (en) * 1979-02-14 1980-08-18 Furukawa Electric Co Ltd:The Method for continuous vulcanization of rubber long-sized object
JPH10305472A (ja) * 1997-05-02 1998-11-17 Yokohama Rubber Co Ltd:The ホース及びその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2013911A1 (fr) * 1968-07-29 1970-04-10 Angus George Co Ltd
JPS5022073B1 (fr) * 1969-03-14 1975-07-28
US4112031A (en) * 1975-07-23 1978-09-05 Paul Troester Maschinenfabrik Process and apparatus for producing rubber hose with textile thread reinforcing
DE2841142A1 (de) * 1977-09-21 1979-03-29 Dunlop Ltd Verstaerkte rohrfoermige gegenstaende
JPS55107443A (en) * 1979-02-14 1980-08-18 Furukawa Electric Co Ltd:The Method for continuous vulcanization of rubber long-sized object
JPH10305472A (ja) * 1997-05-02 1998-11-17 Yokohama Rubber Co Ltd:The ホース及びその製造方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 197534, Derwent World Patents Index; Class A88, AN 1975-56503W, XP002160184 *
PATENT ABSTRACTS OF JAPAN vol. 004, no. 158 (M - 039) 5 November 1980 (1980-11-05) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 02 26 February 1999 (1999-02-26) *

Also Published As

Publication number Publication date
AU5531500A (en) 2001-12-17
MXPA02001470A (es) 2003-07-21

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