WO2015170640A1 - Structure de matrice de moulage et joint d'étanchéité - Google Patents

Structure de matrice de moulage et joint d'étanchéité Download PDF

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Publication number
WO2015170640A1
WO2015170640A1 PCT/JP2015/062783 JP2015062783W WO2015170640A1 WO 2015170640 A1 WO2015170640 A1 WO 2015170640A1 JP 2015062783 W JP2015062783 W JP 2015062783W WO 2015170640 A1 WO2015170640 A1 WO 2015170640A1
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WO
WIPO (PCT)
Prior art keywords
seal
molding
burr
die structure
mold
Prior art date
Application number
PCT/JP2015/062783
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English (en)
Japanese (ja)
Inventor
藤原　覚
寛 西村
克也 岡本
Original Assignee
三菱電線工業株式会社
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Filing date
Publication date
Application filed by 三菱電線工業株式会社 filed Critical 三菱電線工業株式会社
Publication of WO2015170640A1 publication Critical patent/WO2015170640A1/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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • 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
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings

Definitions

  • the present invention relates to a molding die structure and a seal.
  • a molding die structure for injection molding or compression molding of a seal such as an O-ring is provided with a pair of molds whose parting surfaces are superposed and separable from each other.
  • a cavity groove and a sub-groove disposed in the vicinity of the groove are recessed, and a belt-like parallel surface having a minute gap is provided between the cavity groove and the sub-groove.
  • a film-like communication path was formed by the parallel surfaces. Therefore, a seal manufactured from such a molding die is connected to an annular burr portion having a slightly large cross-sectional area (formed by a secondary groove) via an annular band-shaped film portion.
  • the film part and the annular burr part are integrally taken out from the molding die (see Patent Document 1).
  • the above-described molding die of Patent Document 1 is a die for molding a simple O-ring, and the O-ring (seal) is independently taken out from the parting surface.
  • a molding method has been proposed in which a large number of seals are connected to each other with a planar film from a mold and taken out into a sheet shape.
  • the present inventors are intensively researching and developing a molding method in which a large number of molds are taken out simultaneously.
  • a seal having a complicated cross-sectional shape such as a U-packing needs to be manufactured by shifting the parting line. However, if the parting line is shifted, it is difficult to make the burr thickness uniform in terms of mold production.
  • the burr thickness is different between the inner diameter side and the outer diameter side. May be excessive. As described above, when the burr thickness is excessive, it is difficult to separate the molded product and the burr. Moreover, if the burrs are forcibly separated and removed, the molded product itself is deficient.
  • the present invention can take out a large number of seals having a complicated cross-sectional shape as a molded product at the same time in the form of a sheet, and further, without causing defects (peeling) in the seal as a molded product, It is an object of the present invention to provide a molding die structure that can be easily and reliably separated from a burr. It is another object of the present invention to provide a seal that can be easily separated from a planar liner (as a burr) while reliably maintaining a sealing function.
  • the molding die structure according to the present invention is a molding die structure having a pair of molds whose parting surfaces are superposed and separable from each other; In addition to forming a protrusion, a tapered connecting portion is formed on the burr side, and a V-shaped notch for stress concentration generation is formed in a notch shape at the separation boundary portion connecting the tip of the small protrusion and the tapered connecting portion.
  • Each of the pair of molds is provided with corners for the purpose.
  • the pair of molds includes a plurality of cavities for forming a plurality of seal forming portions, an enclosed annular space for forming the burrs, and a plurality of the burrs connected in a sheet shape.
  • a minute gap portion for forming the planar liner is formed between the parting surfaces of the pair of molds, and at least one of the corner portions is formed by a rectangular convex section, It is a rush shape within the thickness dimension of the minute gap. Further, in the seal according to the present invention, burrs are separated and removed at the tapered small protrusions that protrude from the portion where the sealing function is not hindered.
  • the molding die structure according to the present invention it is possible to easily and efficiently separate from a burr and take out a seal molded product having a complicated cross-sectional shape without causing defects such as burrs.
  • the seal according to the present invention can be easily and efficiently separated and removed from the burr, is easy to manufacture, and reliably retains the sealing function.
  • FIG. 4 is a plan view showing an example of a sheet-like rubber molded product obtained by the molding die structure of FIGS. 1 to 3.
  • FIG. 3 is an enlarged view of a main part of FIG. 2. It is the further enlarged view of the principal part of FIG.
  • sticker obtained by the molding die structure which concerns on this invention.
  • rubber molded product obtained by the shaping die structure which concerns on this invention.
  • FIG. 11 is an enlarged cross-sectional explanatory view of a main part of a rubber molded product molded by the molding die structure shown in FIG.
  • FIG. 12 is an explanatory cross-sectional view for explaining an action when separating the seal from the burr in the rubber molded product of FIG.
  • FIG. 10 is a figure which shows an example of the seal
  • the parting surfaces P 1 and P 2 are provided with a pair of molds 1 and 2 that can be separated from each other.
  • the upper mold in the figure may be referred to as a first mold 1 and the lower mold in the figure may be referred to as a second mold 2 in some cases.
  • cavities 3 for forming a plurality of seal forming portions S 0 as shown in FIG. ing. 1 to 3 exemplify a mold structure for injection molding.
  • a hot platen 8 is fixed to the upper surface of the first mold 1 and the second mold is used.
  • a hot platen 9 is fixed to the lower surface of 2, and vulcanization is performed by heating and pressing after the injection molding step.
  • An injection nozzle 22 is configured to inject and inject the raw rubber 5 in pressure contact with the sprue 6 at the center of the first mold 1 in plan view.
  • the injected raw rubber 5 is formed in the 360 ° radial direction R from the position X where the axis of the sprue 6 intersects the parting P 1 and P 2 of the first mold 1 and the second mold 2. It flows and fills the cavity sequentially in the radial outward direction.
  • FIG. 9A illustrates a seal S manufactured by the molding die structure according to the present invention, and specifically shows a U-packing.
  • the outer lip portion 30, the bottom wall portion 31, the inner lip portion 32, and the dust seal protruding piece portion 33 are integrally formed, and the outer lip portion 30 has a triangular triangular cross section in the vicinity of the tip.
  • a sealing projection 34 is formed.
  • the inner diameter side corner portion 35 at the tip of the inner lip portion 32, the inner diameter side corner portion 36 at the tip of the projecting piece portion 33, and the sealing projection 34 exhibit an important sealing function as a U-packing (seal S). It is a part.
  • the tapered small protrusions 37 and 38 indicated by dots are portions where the burrs 40 are separated (see FIGS. 7 and 8). That is, the small protrusions 37 and 38 have a tapered cross-sectional shape such as a triangle, and are provided at a position where the sealing function is not hindered by avoiding the aforementioned inner diameter side corners 35 and 36 and the protrusion 34, 7 (A) and FIG. 8 (A), from the state of being continuous (integrated) with the burr 40 through the tips of the tapered small protrusions 37 and 38, FIG. 7 (B) and FIG. as in B), are torn up from the tip of the small projections 37 and 38, burrs 40 are separated and removed from the seal mold section S 0.
  • FIGS. 7 (A) and 8 (A) the enlarged cross-sectional shape of the main part thereof is shown in FIGS. 7 (A) and 8 (A).
  • V-shaped notches V 1 and V 2 for stress concentration generation are formed in both sides in a notch shape at the separation boundary portion 41 between the seal molding portion S 0 and the burr 40.
  • Tapered small protrusions 37 and 38 are formed at portions that do not hinder the sealing function of the seal S (see FIG. 9 (A)) taken out separately from the sheet-like rubber molded product 25 (see FIG. 4).
  • a tapered connecting portion 40Z is formed on the burr 40 side, and the tips of the small protrusions 37 and 38 are connected to the tapered connecting portion 40Z on the burr 40 side, as shown in FIGS.
  • V-shaped notches V 1 and V 2 are formed in the separation boundary portion 41 where tearing (cracks) easily occurs due to the occurrence of stress concentration.
  • the molding die structure according to the present invention includes first corner portions 42, 43, 44, 45 for forming the stress concentration generating V-shaped notches V 1 , V 2 .
  • a mold 1 and a second mold 2 are provided.
  • a plurality of cavities 3 are provided as shown in FIGS. It is provided in the form of a divergent spot in plan view.
  • the parting lines L 1 and L 2 are shifted (two lines). That is, the seal S to be molded is a seal having a relatively complicated cross section such as U packing, and it is necessary to manufacture the mold by shifting the parting lines L 1 and L 2 in terms of shape.
  • the burr 40 shown in FIG. 8 has a disc shape, and the outer peripheral edge thereof is gradually thinned to form the aforementioned tapered connecting portion 40Z. Therefore, as shown in FIG. 5 and the like, the disk-shaped space 46 is formed by the first mold 1 and the second mold 2. Further, the burr 40 shown in FIG. 7 has an annular shape in plan view, the lower surface is a flat surface, the upper surface is a mirror-like shape, and the inner peripheral edge is gradually thinned to form the tapered connecting portion 40Z. . Therefore, as the mold structure, the surrounding annular space 47 is formed as shown in FIG. Moreover, the plurality of burrs 40 (see FIG.
  • the mold structure is such that the minute gap g forming the planar liner 48 (see FIG. 4) is parting surfaces P 1 and P 2 of a pair of molds 1 and 2. Are formed between each other. Furthermore, as shown in FIGS. 6A and 6B, at least one of the corners 42, 43, 44, 45 for forming the V-shaped notches V 1 and V 2 in a notch shape is: It is formed by a convex section 50 having a transverse cross section. In other words, specifically, one corner 42 is constituted by one corner of the rectangular convex portion 50. Moreover, as shown in FIG. 6, the rectangular cross-section convex portion 50 rushes into the thickness dimension of the minute gap portion g.
  • the corner portion 42 also has a protruding shape within the thickness dimension of the minute gap portion 8.
  • the position of the planar liner 48 having a thickness dimension g ′ equal to the thickness dimension of the minute gap g is shown in FIG. Shown with a two-dot chain line.
  • the thickness dimension g ′ may vary greatly.
  • the thickness dimension g ′ varies greatly.
  • the V-shaped notches V 1 and V 2 are still kept in close proximity, and the burr 40 and the seal molding portion S 0 are
  • a large concentrated stress is generated at the V-shaped notches V 1 and V 2 , so that the burr 40 and the seal molding portion S 0 can be separated smoothly and reliably.
  • the thickness g ′ of the planar liner 48 is preferably 0.05 mm to 0.15 mm, and more preferably 0.07 mm to 0.12 mm. The thickness dimension g'By setting in this way, even undercutting product, and a planar liner 48 and the seal forming portion S 0 and burr 40 integral with the sheet, the dies 1 and 2 Can be taken out.
  • the mold structure is applied to the injection molding method, but this can be freely applied to the compression molding method.
  • 28 is a thick (bar) outer frame burr formed along the outer peripheral edge, and the outer peripheral edge of the planar liner 48. Are connected (integrated).
  • the outer frame burr 28 is formed by the raw rubber flowing into the space 27 having a circular cross section made up of the concave grooves 29 and 29 having a semicircular cross section shown in FIGS. 1 to 5, as shown in FIG. ,It is formed.
  • FIGS. 10 to 12 show a molding die structure as a reference example.
  • FIG. 13 exemplifies a seal S formed by this mold structure.
  • the seal S is used for a reciprocating motion which is used by being attached to one annular concave groove of a sliding member which can slide axially with respect to each other.
  • This is a seal S.
  • the cross section has a triangular top portion 11, a rectangular body portion 12, and a groove bottom side bulging portion 13.
  • a plurality of small protrusions 17 are provided on the front surface and the back surface of the body portion 12 and are inserted so that the bulging portion 13 is in contact with the bottom surface of the annular groove (not shown).
  • the top 11 is slidably contacted with the mating sliding member to form a sealing action.
  • the small protrusion 17 can contact the side surface of the annular concave groove to prevent the body portion 12 and the top portion 11 from falling sideways.
  • FIG. 10 shows a mold structure for molding the seal S as shown in FIG. 13 and includes a pair of molds 1 and 2 whose parting surfaces P 1 and P 2 are superposed and separable from each other. If the pair of molds 1 and 2 is called a first mold and a second mold, respectively, a plurality of seal molding parts S 0 are shown in FIG. 4 (as in the above-described embodiment). As described above, the plurality of cavities 3 are arranged in a lattice shape in a plan view so that they can be taken out in a sheet form. The raw rubber is injection-molded and then vulcanized, etc., is the same as in the above-described embodiment. Compared with FIGS. 1 to 3, except for the first mold 1 and the second mold 2, The same configuration is used.
  • FIGS. 10B and 10C are enlarged views of portions b and c in FIG. 10A, respectively.
  • FIGS. 10A, 10B, and 10C as shown in FIG.
  • One line L 1 is provided, and further, an inner peripheral space 14 and an outer peripheral space 15 are provided in an annular shape near the inner periphery and the outer periphery of the annular cavity 3.
  • the inner peripheral space portion 14 is formed by sub-grooves 14A and 14A that are recessed in the parting surfaces P 1 and P 2 of the first mold 1 and the second mold 2, and the outer peripheral space portion 15 is
  • the sub-grooves 15A and 15A are formed in the parting surfaces P 1 and P 2 of the first mold 1 and the second mold 2, respectively.
  • the cavity 3 and the inner circumferential space portion 14 are connected to each other via a small film-shaped communication passage 16A, and the cavity 3 and the outer circumferential space portion 15 are connected to each other via a small-width film communication passage 16B.
  • the cross-sectional area of the inner circumferential side space portion 14 is sufficiently smaller than the sectional area of the cavity 3, and the inner peripheral edge of the inner circumferential side space portion 14 has a minute gap portion g that is circular in plan view.
  • the inner peripheral burr 40A formed in the inner peripheral space portion 14 is a minute gap portion g having a circular shape in plan view.
  • the cross-sectional area of the outer peripheral side space portion 15 connected through the film-shaped communication path 16B having a small width is sufficiently smaller than the cross-sectional area of the cavity 3, and the outer peripheral edge of the outer peripheral side space portion 15 is The outer peripheral side formed by a large number of outer peripheral side space portions 15 connected to the minute gap portion g (see the right end of FIG. 10A) for forming the planar liner 48 described in FIG.
  • the total number of burrs 40B (see FIG. 11A) can be separated and removed into a sheet form integrally with the planar liner 48.
  • the film-like communicating path 16A, the blade width W 1 of the first mold 1 to form a 16B, the second mold 2 and the blade edge width W 2, are made different.
  • W 1 > W 2 is set.
  • W 1 is set to 0.01 mm and W 2 is set to 0.03 mm.
  • steps are formed in the sub-grooves 14A and 14A; the sub-grooves 15A and 15A.
  • FIG. 11 An enlarged view of the main part of the rubber molded product 25 molded with the mold structure shown in FIG. 10 is shown as FIG. 11, and a further enlarged view is shown in FIG.
  • the separation boundary portion has a continuous surface shape with no step, and has a step on the burrs 40A and 40B side (see FIGS. 12A and 12B).
  • the seal forming portion S 0 is fixed and held, burrs 40A, the 40B, by applying an external force in the direction of arrow F, separated and removed burrs 40A, the 40B, to obtain a seal S as shown in FIG. 13 .
  • the seal of the seal molding portion S 0 is provided in the molding die structure including the pair of dies 1 and 2 whose parting surfaces P 1 and P 2 are superposed and separated from each other.
  • the tapered small protrusions 37 and 38 are formed in a portion that does not inhibit the function, and the tapered connecting portion 40Z is formed on the burr 40 side. Further, the tip of the small protrusions 37 and 38 and the tapered connecting portion 40Z are connected to each other.
  • Each of the pair of molds 1 and 2 is provided with corner portions 42, 43, 44, 45 for forming stress concentration generating V-shaped notches V 1 , V 2 in a notch shape in the separation boundary portion 41 to be connected. Since it has a configuration, the V-shaped notches V 1 and V 2 can be reliably and easily formed, and the seal S is a beautiful seal that is free from defects and cracks, and that completely maintains the sealing function. Can be manufactured.
  • the pair of molds 1 and 2 includes a plurality of cavities 3 for forming a plurality of seal forming portions S 0 and an surrounding annular space portion 47 for forming the burr 40.
  • a minute gap portion g for forming the planar liner 48 that connects the plurality of burrs 40 in a sheet shape is formed between the parting surfaces P 1 and P 2 of the pair of molds 12.
  • at least one of the corner portions 42, 43, 44, 45 is formed by a rectangular cross-section convex portion 50, and has a shape that protrudes into the thickness dimension of the minute gap portion g.
  • the rubber molded product can be efficiently removed from the mold, and the seal can be easily separated from the sheet-like rubber molded product.
  • the seal S having a complicated cross-sectional shape having two parting lines L 1 and L 2 can be efficiently and beautifully manufactured.
  • the burr 40 is separated and removed in the tapered small protrusions 37 and 38 that protrude from the portion where the sealing function is not hindered, the sealing performance is always stably secured. It becomes a high quality seal and is easy to manufacture.

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

Abstract

Le problème décrit par la présente invention est d'obtenir une structure de matrice moyennant quoi une séparation d'un article moulé d'étanchéité et de bavures est aisée et des défauts (formation de criques) ou des fissures n'apparaissent pas dans le joint d'étanchéité séparé. La solution selon l'invention porte sur une structure de matrice de moulage qui comprend des coins (42, 43, 44, 45), au niveau de sites qui n'interfèrent pas avec la fonction d'étanchéité d'une section formant joint d'étanchéité, lesdits coins étant destinés à former de petites saillies effilées et à former, selon une forme entaillée, des entailles en forme de V afin de produire une concentration de contraintes.
PCT/JP2015/062783 2014-05-09 2015-04-28 Structure de matrice de moulage et joint d'étanchéité WO2015170640A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014097559A JP6294756B2 (ja) 2014-05-09 2014-05-09 成形金型構造及びシール製造方法
JP2014-097559 2014-05-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109421218A (zh) * 2017-08-29 2019-03-05 三菱电线工业株式会社 弹性体制品制造方法及成形模具构造

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7345765B2 (ja) * 2021-08-18 2023-09-19 三菱電線工業株式会社 リング状製品の寸法測定装置及びリング状製品の寸法測定方法

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JPS62167013A (ja) * 1986-01-17 1987-07-23 Mitsubishi Cable Ind Ltd 成形金型
JP2003225917A (ja) * 2002-02-04 2003-08-12 Nok Corp 成形型
JP2008157383A (ja) * 2006-12-25 2008-07-10 Inoac Corp シール及びその製造方法
US20080277879A1 (en) * 2007-03-07 2008-11-13 Sebastien Pradelle Y-shaped gasket, a method of fabricating such a gasket, and the use of such a gasket for reducing the engagement forces of a connector
JP2010234646A (ja) * 2009-03-31 2010-10-21 Nok Corp シール部品の製造方法及び金型
JP2011143723A (ja) * 2004-08-20 2011-07-28 Ntn Corp シールリング
JP2012154409A (ja) * 2011-01-26 2012-08-16 Mitsubishi Cable Ind Ltd 弾性シール

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Publication number Priority date Publication date Assignee Title
JPH0568623U (ja) * 1992-02-25 1993-09-17 エヌオーケー株式会社 成形型

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62167013A (ja) * 1986-01-17 1987-07-23 Mitsubishi Cable Ind Ltd 成形金型
JP2003225917A (ja) * 2002-02-04 2003-08-12 Nok Corp 成形型
JP2011143723A (ja) * 2004-08-20 2011-07-28 Ntn Corp シールリング
JP2008157383A (ja) * 2006-12-25 2008-07-10 Inoac Corp シール及びその製造方法
US20080277879A1 (en) * 2007-03-07 2008-11-13 Sebastien Pradelle Y-shaped gasket, a method of fabricating such a gasket, and the use of such a gasket for reducing the engagement forces of a connector
JP2010234646A (ja) * 2009-03-31 2010-10-21 Nok Corp シール部品の製造方法及び金型
JP2012154409A (ja) * 2011-01-26 2012-08-16 Mitsubishi Cable Ind Ltd 弾性シール

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109421218A (zh) * 2017-08-29 2019-03-05 三菱电线工业株式会社 弹性体制品制造方法及成形模具构造
CN114559607A (zh) * 2017-08-29 2022-05-31 三菱电线工业株式会社 弹性体制品制造方法及成形模具构造
CN109421218B (zh) * 2017-08-29 2022-06-24 三菱电线工业株式会社 弹性体制品制造方法及成形模具构造

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