WO2020110371A1 - Méthode de fabrication de tuyau en résine courbé - Google Patents

Méthode de fabrication de tuyau en résine courbé Download PDF

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Publication number
WO2020110371A1
WO2020110371A1 PCT/JP2019/029452 JP2019029452W WO2020110371A1 WO 2020110371 A1 WO2020110371 A1 WO 2020110371A1 JP 2019029452 W JP2019029452 W JP 2019029452W WO 2020110371 A1 WO2020110371 A1 WO 2020110371A1
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WO
WIPO (PCT)
Prior art keywords
bent
resin
cavity
insert member
resin pipe
Prior art date
Application number
PCT/JP2019/029452
Other languages
English (en)
Japanese (ja)
Inventor
栗林　延全
Original Assignee
横浜ゴム株式会社
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 横浜ゴム株式会社 filed Critical 横浜ゴム株式会社
Publication of WO2020110371A1 publication Critical patent/WO2020110371A1/fr

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    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds

Definitions

  • the present invention relates to a method for manufacturing a bent resin pipe, and more specifically, when manufacturing a bent resin pipe by resin injection molding using an assist material such as a gas assist molding method, a bent inner portion of the bent resin pipe is reinforced.
  • the present invention relates to a method for manufacturing a bent resin pipe capable of reliably improving pressure resistance.
  • a gas-assisted molding method in which, when a resin pipe is molded by resin injection molding, a molten resin is injected into a mold and then a high pressure gas such as nitrogen gas is injected into the mold (for example, refer to Patent Document 1). ..
  • a high pressure gas such as nitrogen gas
  • water, metal balls, or resin balls may be injected into the mold at high pressure as an assist material.
  • the assist material injected into the mold cavity will pass through the cavity by the shortest route within the range where the bent portion of the bent resin pipe is molded.
  • the injected assist material passes so as to be unevenly distributed inside the bent portion of the cavity. Therefore, the injected resin is easily scraped by the assist material in the inside of the bend, and the thickness of the resin is smaller than that in the outside of the bend.
  • the manufactured bent resin tube has a room for improvement because it becomes difficult to secure pressure resistance to withstand a preset target internal pressure.
  • An object of the present invention is to reliably improve the pressure resistance by reinforcing the bent inner portion of the bent resin pipe when manufacturing the bent resin pipe by resin injection molding using an assist material such as a gas assist molding method. It is an object of the present invention to provide a method of manufacturing a bendable resin tube which is possible.
  • the method for producing a bent resin pipe of the present invention is such that after the molten resin is injected into a bending and extending cavity formed in a mold, an assist material is injected into this cavity and the injection is performed.
  • a method for manufacturing a bent resin tube for curing a resin to manufacture a bent resin tube in a bent inner portion of a preselected bent portion of the cavity, a predetermined length is projected from the bent inner portion in the extending direction of the cavity.
  • the extending holding portion is formed in the mold in a state of being communicated with the cavity, the insert member is fitted to the holding portion to close the mold, and then the molten resin is injected into the cavity. It is characterized in that the resin that has been injected and cured is integrated with the insert member.
  • the insert member since the molten resin is injected into this cavity with the insert member fitted to the holding portion formed in the bending inner portion of the preselected bending portion of the cavity, the insert member is It is possible to manufacture an integrated bent resin tube.
  • the reinforcing effect of the integrated insert member makes it possible to reliably improve the pressure resistance of the bent inner portion.
  • FIG. 1 is an explanatory view illustrating a bent resin pipe manufactured according to the present invention in a plan view.
  • FIG. 2 is a partially enlarged view of FIG.
  • FIG. 3 is a sectional view taken along the line AA of FIG.
  • FIG. 4 is an explanatory view showing a modified example of the insert member in a plan view of a bent resin pipe.
  • FIG. 5 is a sectional view taken along line BB of FIG.
  • FIG. 6 is an explanatory view illustrating a molding device for manufacturing a bent resin pipe.
  • FIG. 7 is an explanatory view illustrating the mold of FIG. 6 in plan view.
  • FIG. 8 is an explanatory view illustrating the mold excluding the insert member of FIG. 7 by enlarging it in a plan view at a parting line.
  • FIG. 9 is a sectional view taken along line CC before the mold of FIG. 7 is closed.
  • FIG. 10 is a cross-sectional view illustrating a state where the mold of FIG. 9 is closed.
  • FIG. 11 is a cross-sectional view taken along line CC before the mold of FIG. 7 is closed when an all-round insert member is used.
  • FIG. 12 is a cross-sectional view illustrating a state where the mold of FIG. 11 is closed.
  • FIG. 13 is an explanatory view schematically illustrating, in plan view at a parting line, the flow of the injected assist material inside the bent portion of the cavity of FIG. 7 after the injection of the molten resin.
  • a bent resin pipe 1 manufactured according to the present invention is a tubular body having bent portions 4 (4A, 4B) and 5 and extending in this embodiment.
  • the bent resin pipe 1 also has a straight portion 3. Openings 2 are formed at both longitudinal ends of the hollow conduit 1a of the bent resin pipe 1.
  • An alternate long and short dash line CL in the drawing indicates a center line passing through the center of the cross section of the conduit 1a.
  • the wall thickness of the bent resin tube 1 is set to a predetermined reference value tm, but since the assist material 18 is used for molding as will be described later, in the bent portion 4, the wall thickness of the bent inner portion 6a is set.
  • t1 is smaller than the reference value tm and the thickness t2 of the wall surface of the bent outer portion 6b (t1 ⁇ tm ⁇ t2).
  • the thickness of the wall surface of the bent inner portion 6a is smaller than the thickness of the wall surface of the bent outer portion 6b, but the reference value tm or more.
  • the wall thickness of the straight line portion 3 is within the allowable range of the reference value tm or more.
  • the insert member 7 (half-circumference described later) that improves pressure resistance with respect to the bent portion 4 in which the wall thickness of the bent inner portion 6a is less than the reference value tm.
  • the insert member 7a, the entire circumference insert member 7b, etc.) are integrated. Since the thickness of the wall surface of the bent portion 5 is equal to or greater than the reference value tm, the bent portion 5 is not subject to reinforcement by the insert member 7.
  • the bent resin pipe 1 Since the shape of the bent resin pipe 1 is determined by the space restrictions such as the installation place, the bent resin pipe 1 may not have the straight line portion 3 and the number of the bent portions 4 and 5 is not limited. However, the bent resin pipe 1 has at least one bent portion 4 to be reinforced by the insert member 7. The bent resin pipe 1 illustrated in FIG. 1 has two bent portions 4A and 4B to be reinforced by the insert member 7.
  • the insert member 7 is integrated with the bent inner portion 6a of the bent portion 4. More specifically, as illustrated in FIGS. 2 and 3, the bent inner portion 6a of the bent portion 4A is provided with a semi-circular insert member 7a protruding from the bent inner portion 6a to the outer side in the radial direction of the bent resin pipe 1. There is.
  • the half-circumferential insert member 7 a has a shape that extends for a predetermined length in the extending direction of the bent resin tube 1 and extends for a half turn in the circumferential direction of the bent resin tube 1. That is, the semi-circular insert member 7a has a semi-cylindrical shape that covers the semi-circular range of the outer peripheral surface of the bent resin tube 1.
  • the half-circle insert member 7a is provided on the bent inner portion 6a so as to cover the range where the wall thickness is less than the reference value tm.
  • the half-surrounding insert member 7a extends between the boundary points P that are separated from each other in the extending direction of the bent resin tube 1.
  • the semi-circular insert member 7a is extended between the positions where the wall thickness is slightly thicker than the reference value tm.
  • the entire circumference insert member 7b can also be adopted.
  • the entire circumference insert member 7b extends a predetermined length in the extending direction of the bent resin pipe 1, and extends not only to the bent inner portion 6a of the bent portion 4 of the bent resin pipe 1 but also to the bent outer portion 6b. It is continuous all around the circumference. That is, the entire circumference insert member 7b has a cylindrical shape that covers the entire circumference of the outer peripheral surface of the bent resin tube 1.
  • the insert member 7 can be made of the same type (specification) of resin as the bent resin pipe 1 or a different type (specification) of resin. Alternatively, the metal insert member 7 may be used. When the insert member 7 is made of a resin or metal of a different type from the bent resin tube 1, a material having higher rigidity (breaking stress) than the resin 17 forming the bent resin tube 1 is used.
  • Each of the insert members 7 (7a, 7b) is set to have a substantially constant thickness, for example, and is set to have a size capable of obtaining a sufficient reinforcing effect.
  • the thickness ta of the half-circle insert member 7a is, for example, a reference value.
  • Value tm-set to be equal to or greater than the minimum value t1n. That is, it is set to about (tm-t1n) ⁇ ta ⁇ (tm-t1n) ⁇ 1.2.
  • the thickness tb of the entire circumference insert member 7b is set similarly to the thickness ta of the half circumference insert member 7a.
  • the bent resin tube 1 is manufactured using the molding device 8 illustrated in FIG.
  • the molding device 8 includes a cylinder 9 a that injects the molten resin 17 into the mold 10, and an assist material injection portion 9 b that injects the assist material 18 into the mold 10.
  • a suitable type of resin 17 is selected from various injectable resins 17 according to the performance required for the bent resin tube 1.
  • the resin 17 for example, polyamide, polyphenylene sulfide or the like is used.
  • the assist material 18 may be a known material, and an appropriate material is selected from gases such as nitrogen gas, liquids such as water, and solids such as metal spheres and resin spheres.
  • the assist material injection unit 9b employs a known appropriate mechanism according to the type of the assist material 18.
  • the mold 10 is composed of one mold 10a to be assembled and the other mold 10b.
  • the molds 10a and 10b are joined and separated with the parting line PL as a boundary.
  • the mold 10 has a cavity 11 formed therein.
  • the cavity 11 is bent and extends in a shape similar to that of the bent resin tube 1 to be manufactured.
  • the mold 10 is provided with a runner 16a connected to the cavity 11 via a gate 16b.
  • the runner 16 a is connected to the nozzle of the molding device 8 via a sprue formed on the mold 10.
  • the mold 10 is also provided with a discharge portion for the assist material 18 injected into the cavity 11.
  • the mold 10 is further formed with an additional cavity 11a. More specifically, the runner 16a further extending from the cavity 11 is formed in a state where the additional cavity 11a, which is a cavity having the same shape as the half-circle insert member 7a, is in communication with the runner 16a.
  • portions corresponding to the bent portions 4 (4A, 4B) and 5 of the bent resin tube 1 are formed as bent portions 12 (12A and 12B) and 13 of the cavity 11, respectively.
  • a holding portion 15 into which the insert member 7 is fitted is formed at a position corresponding to the insert member 7 of the bent resin pipe 1.
  • the bent portion 12A of the cavity 11 is provided with a half circumference holding portion 15a having a recess in the shape of the half circumference insert member 7a. That is, the half-circumference holding portion 15a extends in the extending direction of the cavity 11 by a predetermined length, and also extends in the circumferential direction of the cavity 11 by a half circumference length.
  • the bent portion 12B of the cavity 11 is also provided with a half circumference holding portion 15a having a recess in the shape of the half circumference insert member 7a of the bent portion 4B of the bent resin tube 1.
  • the semi-circular holding member 15a is fitted with the semi-circular insert member 7a.
  • the molds 10a and 10b are assembled with each other to be in a mold closed state.
  • the inner peripheral surface of the half-circumferential insert member 7a is smoothly (substantially without step) continuous with the adjacent inner peripheral surface of the cavity 11.
  • the molten resin 17 is injected into the mold 10 from the cylinder 9a.
  • the injected resin 17 passes through the sprue formed on the mold 10, the runner 16a, and the gate 16b and is injected into the cavity 11 and the rib molding portion 15.
  • the rib molding portion 15 is filled with the molten resin 17, and the wall surface of the cavity 11 is covered with the molten resin 17.
  • the resin 17 injected into the mold 10 is filled in the additional cavity 11a through the runner 16a that extends further.
  • the assist material 18 is injected into the mold 10 from the assist material injection portion 9b at a predetermined high pressure.
  • the injected assist material 18 passes through the inside of the cavity 11 in which the molten resin 17 is injected at a high pressure along the extending direction thereof.
  • an entire circumference holding portion 15b having a recess in the shape of the entire circumference insert member 7b is formed in the cavity 11. To be done. That is, the entire circumference holding portion 15b extends in the extending direction of the cavity 11 by a predetermined length, and continuously extends over the entire circumference of the cavity 11 in the circumferential direction to communicate with the cavity 11. It is formed in the mold 10.
  • the entire circumference holding portion 15b is fitted with the entire circumference insert member 7b.
  • the molds 10a and 10b are assembled to each other to be in a mold closed state.
  • the inner peripheral surface of the entire circumference insert member 7b is smoothly (substantially without step) continuous with the adjacent inner peripheral surface of the cavity 11.
  • the assist material 18 injected at high pressure tends to pass biasedly toward the inner side of the bend, which is the shortest route of the cavity 11. Therefore, the resin 17 of the bent inner portion 14a of the bent portion 12A is more scraped by the assist material 18 that passes under high pressure. As a result, the thickness t1 of the resin 17 on the wall surface of the bent inner portion 14a is smaller than the thickness t2 of the resin 17 on the wall surface of the bent outer portion 14b, and is smaller than the reference value tm.
  • the assist material 18 also passes through the other bent portions 12B and 13 as described above. Therefore, in the bent portion 12B as well, the thickness t1 of the resin 17 on the wall surface of the bent inner portion 14a becomes smaller than the reference value tm.
  • the bent portion 13 has a relatively large radius of curvature, it is difficult for the resin 17 on the wall surface of the bent inner portion 14a to be scraped by the assist material 18 that passes under high pressure.
  • the thickness of the resin 17 on the wall surface of the bent inner portion 14a of the bent portion 13 can be ensured to be equal to or greater than the reference value tm, so that the holding portion 15 in which the insert member 7 is fitted and arranged has the bent portions 12A and 12B. It is only provided.
  • the holding portion 15 for example, molding is performed using the molding device 8 in the state where the holding portion 15 is not provided in the cavity 11 of FIG. To manufacture.
  • the thickness of the resin 17 on the wall surface of the bent inner portion of the bent portion of the bent resin tube 1 is measured to confirm whether or not the reference value tm or more.
  • the bent portion where the measured thickness of the resin 17 is less than the reference value tm is specified as the bent portion 4 into which the insert member 7 is integrated.
  • the holding portion 15 is provided on the bent portion 12 of the cavity 11 corresponding to the specified bent portion 4.
  • the thicknesses ta, tb, etc. of the insert member 7 can be set based on the thickness of the resin 17 on the wall surface of the bent inner portion measured at this time.
  • the injected resin 17 is cured to form a resin pipe along the cavity 11, and the insert member 7 is joined to the resin pipe. That is, the bent resin pipe 1 in which the insert member 7 is integrated is manufactured.
  • the thickness t1 of the resin 17 on the wall surface of the bent inner portion 6a is smaller than the reference value tm, but is reinforced by the integrated insert member 7. ing. Therefore, even if a preset target internal pressure acts on the bent resin tube 1, it becomes possible to withstand.
  • this manufacturing method by providing the insert member 7 having appropriate specifications, it is possible to reliably improve the pressure resistance of the desired bent inner portion 6a of the bent resin pipe 1 by the reinforcing effect of the insert member 7. Become.
  • the insert member 7 is molded by hardening the resin 17 filled in the additional cavity 11a. That is, it is very efficient since the insert member 7 can be additionally molded together with the manufacture of the bent resin tube 1 in which the insert member 7 is integrated. After that, the additionally molded insert member 7 can be used by fitting it to the holding portion 15 when molding the bent resin pipe 1 in which the insert member 7 is integrated.
  • the manufacturing method it is possible to mass-produce even the bent resin pipe 1 having a complicated shape.
  • the manufactured bent resin tube 1 it is possible to secure necessary pressure resistance while reducing the weight as compared with the metal tube.
  • the holding portion 15 is a recess having an arc-shaped cross section of the insert member 7.
  • the insert member 7 that extends in the circumferential direction at least as much as the half-round insert member 7a.
  • the bent resin pipe 1 in which the entire circumference insert member 7b is integrated. If the thickness ta and tb of the insert member 7 cannot be set to a large value due to the restriction of the installation space of the bent resin pipe 1, the insert made of a material having higher rigidity (breaking stress) than the resin 17 forming the bent resin pipe 1. It is preferable to use the member 7. By forming the insert member 7 with such a material, the thickness ta and tb of the insert member 7 can be made thinner. On the other hand, when the insert member 7 is made of the same type of resin as the resin 17 forming the resin bending tube 1, both can be more firmly integrated.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une méthode de fabrication d'un tuyau en résine courbé avec lequel la résistance à la pression d'une partie courbée interne souhaitée du tuyau en résine courbé fabriqué par moulage par injection de résine à l'aide d'un matériau d'assistance est améliorée de manière fiable. Dans la présente invention : une partie de maintien de demi-circonférence 15a, qui fait saillie à partir d'une partie courbée interne 14a et s'étend d'une longueur prédéterminée dans une direction d'extension d'une cavité 11, est formée dans un moule 10 dans un état de communication avec la cavité 11 dans la partie interne courbée précédemment sélectionnée 14a des parties courbées 12A, 12B de la cavité 11 formée dans le moule 10 et s'étendant dans une courbe ; le moule 10 est fermé par ajustement d'un élément d'insertion de demi-circonférence 7a dans une partie de demi-circonférence 15a, puis la résine fondue 17 est injectée dans la cavité 11, puis un matériau d'assistance 18 est injecté dans la cavité 11 et la résine fondue 17 est durcie, ainsi l'élément d'insertion de demi-circonférence 7a est intégré à une partie courbée interne 6a des parties courbées 4A, 4B d'un tuyau en résine courbé fabriqué 1.
PCT/JP2019/029452 2018-11-29 2019-07-26 Méthode de fabrication de tuyau en résine courbé WO2020110371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-224008 2018-11-29
JP2018224008A JP7131339B2 (ja) 2018-11-29 2018-11-29 屈曲樹脂管の製造方法

Publications (1)

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WO2020110371A1 true WO2020110371A1 (fr) 2020-06-04

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PCT/JP2019/029452 WO2020110371A1 (fr) 2018-11-29 2019-07-26 Méthode de fabrication de tuyau en résine courbé

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WO (1) WO2020110371A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7502663B2 (ja) * 2022-01-13 2024-06-19 横浜ゴム株式会社 屈曲樹脂管の製造方法および装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009148970A (ja) * 2007-12-20 2009-07-09 Rp Topla Ltd 二層中空成形品の成形方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009148970A (ja) * 2007-12-20 2009-07-09 Rp Topla Ltd 二層中空成形品の成形方法

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JP2020082622A (ja) 2020-06-04
JP7131339B2 (ja) 2022-09-06

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