JP6914070B2 - Resin molding mold - Google Patents

Resin molding mold Download PDF

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JP6914070B2
JP6914070B2 JP2017062789A JP2017062789A JP6914070B2 JP 6914070 B2 JP6914070 B2 JP 6914070B2 JP 2017062789 A JP2017062789 A JP 2017062789A JP 2017062789 A JP2017062789 A JP 2017062789A JP 6914070 B2 JP6914070 B2 JP 6914070B2
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hole
layer
layer portion
molding
cavity
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JP2018165007A5 (en
JP2018165007A (en
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田畑　修司
修司 田畑
昌央 関
昌央 関
前田　茂
茂 前田
一晃 打谷
一晃 打谷
尚希 藤田
尚希 藤田
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Nidec Tosok Corp
Nidec America Corp
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Nidec Corp
Nidec Tosok Corp
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Priority to JP2017062789A priority Critical patent/JP6914070B2/en
Priority to CN201820375954.4U priority patent/CN208290345U/en
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Description

本発明は、樹脂成形金型に関する。 The present invention relates to a resin molding die.

樹脂成形品を作るための成形金型が知られる。例えば、特許文献１には、固定金型と可動金型とを有するインサート成形金型が記載される。 Molding dies for making resin molded products are known. For example, Patent Document 1 describes an insert molding die having a fixed die and a movable die.

特開２００９−６６８１０号公報JP-A-2009-66810

上記のような成形金型を用いて、樹脂成形品として柱状部材を成形する場合、柱状部材の延びる方向の一部において柱状部材にヒケが生じて、部分的に柱状部材の成型精度が低下する場合があった。 When a columnar member is molded as a resin molded product using a molding die as described above, sink marks occur in the columnar member in a part of the extending direction of the columnar member, and the molding accuracy of the columnar member is partially lowered. There was a case.

本発明は、上記事情に鑑みて、柱状部材を延びる方向の全体に亘って精度よく成形できる樹脂成形金型を提供することを目的の一つとする。 In view of the above circumstances, one of the objects of the present invention is to provide a resin molding die capable of accurately molding the columnar member in the entire extending direction.

本発明の樹脂成形金型の一つの態様は、上下方向に積層される複数の層部を有する成形部を備え、前記複数の層部は、第１層部と、前記第１層部の上側に積層される第２層部と、前記第２層部の上側に積層される第３層部と、を含み、前記成形部は、樹脂材料が流し込まれる空洞部を有し、前記空洞部は、上下方向に延び、前記第１層部と前記第２層部と前記第３層部とに跨って配置され、前記第２層部の気体の透過率は、前記第１層部の前記透過率および前記第３層部の前記透過率と異なる。 One aspect of the resin molding mold of the present invention includes a molding portion having a plurality of layer portions laminated in the vertical direction, and the plurality of layer portions are a first layer portion and an upper side of the first layer portion. The molded portion includes a second layer portion laminated to the above, and a third layer portion laminated on the upper side of the second layer portion. The molded portion has a cavity portion into which a resin material is poured, and the cavity portion is It extends in the vertical direction and is arranged so as to straddle the first layer portion, the second layer portion, and the third layer portion, and the gas permeability of the second layer portion is the transmittance of the first layer portion. It is different from the rate and the transmittance of the third layer portion.

本発明の一つの態様によれば、柱状部材を延びる方向の全体に亘って精度よく成形できる樹脂成形金型が提供される。 According to one aspect of the present invention, there is provided a resin molding die capable of accurately molding the columnar member in the entire extending direction.

図１は、第１実施形態の樹脂成形金型を示す断面図である。FIG. 1 is a cross-sectional view showing a resin molding die of the first embodiment. 図２は、第１実施形態の成形部を示す斜視図である。FIG. 2 is a perspective view showing a molded portion of the first embodiment. 図３は、第１実施形態の成形部を下側から視た図である。FIG. 3 is a view of the molded portion of the first embodiment as viewed from below. 図４は、第１実施形態の成形部を示す斜視断面図である。FIG. 4 is a perspective sectional view showing a molded portion of the first embodiment. 図５は、第１実施形態の成形部を示す図であって、図３におけるV-V断面図である。FIG. 5 is a view showing a molded portion of the first embodiment, and is a cross-sectional view taken along the line VV in FIG. 図６は、第１実施形態の成形部を示す斜視断面図である。FIG. 6 is a perspective sectional view showing a molded portion of the first embodiment. 図７は、第２実施形態の成形部を示す断面図である。FIG. 7 is a cross-sectional view showing a molded portion of the second embodiment. 図８は、第２実施形態の成形部を示す斜視図である。FIG. 8 is a perspective view showing a molded portion of the second embodiment. 図９は、第２実施形態の成形部を示す斜視断面図である。FIG. 9 is a perspective sectional view showing a molded portion of the second embodiment. 図１０は、第２実施形態の成形部の一部を下側から視た図である。FIG. 10 is a view of a part of the molded portion of the second embodiment as viewed from below.

各図に示すＺ軸方向は、正の側を上側とし、負の側を下側とする上下方向Ｚである。各図に示すＸ軸方向は、上下方向Ｚと直交する前後方向Ｘである。各図に示すＹ軸方向は、上下方向Ｚおよび前後方向Ｘの両方と直交する左右方向Ｙである。なお、上下方向、前後方向、左右方向、上側および下側とは、単に各部の相対位置関係を説明するための名称であり、実際の配置関係等は、これらの名称で示される配置関係等以外の配置関係等であってもよい。 The Z-axis direction shown in each figure is the vertical direction Z with the positive side as the upper side and the negative side as the lower side. The X-axis direction shown in each figure is the front-rear direction X orthogonal to the vertical direction Z. The Y-axis direction shown in each figure is the left-right direction Y orthogonal to both the vertical direction Z and the front-back direction X. The vertical direction, front-rear direction, left-right direction, upper side, and lower side are simply names for explaining the relative positional relationship of each part, and the actual arrangement relationship, etc. is other than the arrangement relationship, etc. indicated by these names. It may be the arrangement relation of.

＜第１実施形態＞
図１に示すように、本実施形態の樹脂成形金型１は、例えば、スプールバルブＳＶを成形するための金型である。スプールバルブＳＶは、上下方向Ｚに延びる中心軸Ｊに沿って配置される多段の円柱状である。中心軸Ｊを中心とする径方向を単に「径方向」と呼び、中心軸Ｊを中心とする周方向を単に「周方向」と呼ぶ。スプールバルブＳＶは、第１小径部ＳＤ１と、第１大径部ＢＤ１と、第２小径部ＳＤ２と、第２大径部ＢＤ２と、第３小径部ＳＤ３と、を下側から上側に向かってこの順に有する。 <First Embodiment>
As shown in FIG. 1, the resin molding mold 1 of the present embodiment is, for example, a mold for molding a spool valve SV. The spool valve SV is a multi-stage columnar shape arranged along a central axis J extending in the vertical direction Z. The radial direction centered on the central axis J is simply called the "diameter direction", and the circumferential direction centered on the central axis J is simply called the "circumferential direction". The spool valve SV has a first small diameter portion SD1, a first large diameter portion BD1, a second small diameter portion SD2, a second large diameter portion BD2, and a third small diameter portion SD3 from the lower side to the upper side. Have in this order.

第１小径部ＳＤ１は、スプールバルブＳＶの下側の端部である。第３小径部ＳＤ３は、スプールバルブＳＶの上側の端部である。第１大径部ＢＤ１の外径と第２大径部ＢＤ２の外径とは、第１小径部ＳＤ１の外径、第２小径部ＳＤ２の外径および第３小径部ＳＤ３の外径よりも大きく、互いに同じである。 The first small diameter portion SD1 is a lower end portion of the spool valve SV. The third small diameter portion SD3 is an upper end portion of the spool valve SV. The outer diameter of the first large diameter portion BD1 and the outer diameter of the second large diameter portion BD2 are larger than the outer diameter of the first small diameter portion SD1, the outer diameter of the second small diameter portion SD2, and the outer diameter of the third small diameter portion SD3. Large and the same as each other.

樹脂成形金型１は、スプールバルブＳＶの外形状の母型となるキャビティ１ａを有する。キャビティ１ａに溶融した樹脂が流し込まれて、冷却されることでスプールバルブＳＶが成形される。樹脂成形金型１は、第１金型部材１０と、第２金型部材２０と、第３金型部材３０と、を有する。 The resin molding die 1 has a cavity 1a that serves as a base mold for the outer shape of the spool valve SV. The molten resin is poured into the cavity 1a and cooled to form the spool valve SV. The resin molding mold 1 has a first mold member 10, a second mold member 20, and a third mold member 30.

第１金型部材１０は、基台１１と、第１保持部材１２と、成形部１３と、成形部１４と、栓体１５と、を有する。すなわち、樹脂成形金型１は、基台１１と、第１保持部材１２と、成形部１３と、成形部１４と、栓体１５と、を備える。基台１１は、中心軸Ｊに沿って基台１１を上下方向Ｚに貫通する貫通孔１１ａを有する。貫通孔１１ａは、キャビティ１ａの下側の端部に繋がる。 The first mold member 10 includes a base 11, a first holding member 12, a molding portion 13, a molding portion 14, and a plug body 15. That is, the resin molding die 1 includes a base 11, a first holding member 12, a molding portion 13, a molding portion 14, and a plug body 15. The base 11 has a through hole 11a that penetrates the base 11 in the vertical direction Z along the central axis J. The through hole 11a connects to the lower end of the cavity 1a.

第１保持部材１２は、第１保持部材１２を上下方向Ｚに貫通する第１保持孔１２ａを有する。成形部１３は、第１保持孔１２ａの内部に保持される。成形部１３は、第１小径部ＳＤ１を成形する部分である。成形部１４は、成形部１３の上側において第１保持孔１２ａの内部に保持される。成形部１４は、第１大径部ＢＤ１を成形する部分である。栓体１５は、上下方向Ｚに延びる円柱状である。栓体１５は、貫通孔１１ａに嵌め合わされ、貫通孔１１ａを閉塞する。栓体１５の上端面は、キャビティ１ａの底面を構成する。 The first holding member 12 has a first holding hole 12a that penetrates the first holding member 12 in the vertical direction Z. The molding portion 13 is held inside the first holding hole 12a. The molding portion 13 is a portion for molding the first small diameter portion SD1. The molding portion 14 is held inside the first holding hole 12a on the upper side of the molding portion 13. The molding portion 14 is a portion for molding the first large diameter portion BD1. The plug body 15 is a columnar shape extending in the vertical direction Z. The plug 15 is fitted into the through hole 11a and closes the through hole 11a. The upper end surface of the plug 15 constitutes the bottom surface of the cavity 1a.

第２金型部材２０は、第１金型部材１０の上側に固定される。第１金型部材１０と第２金型部材２０との上下方向Ｚの間には、中心軸Ｊを通って樹脂成形金型１を左右方向Ｙに貫通する挿入孔１ｃが設けられる。第２金型部材２０は、第２保持部材２１と、成形部４０と、成形部２２と、を有する。すなわち、樹脂成形金型１は、第２保持部材２１と、成形部４０と、成形部２２と、を備える。 The second mold member 20 is fixed to the upper side of the first mold member 10. An insertion hole 1c is provided between the first mold member 10 and the second mold member 20 in the vertical direction Z to pass through the resin molding mold 1 in the horizontal direction Y through the central axis J. The second mold member 20 has a second holding member 21, a molding portion 40, and a molding portion 22. That is, the resin molding die 1 includes a second holding member 21, a molding portion 40, and a molding portion 22.

第２保持部材２１は、第２保持部材２１を上下方向Ｚに貫通する第２保持孔２１ａを有する。成形部４０は、第２保持孔２１ａの内部に保持される。成形部４０は、第２大径部ＢＤ２を成形する部分である。成形部２２は、成形部４０の上側において第２保持孔２１ａの内部に保持される。成形部２２は、第３小径部ＳＤ３を成形する部分である。成形部２２は、上側に開口する樹脂注入孔部１ｂを有する。樹脂注入孔部１ｂは、キャビティ１ａの上端に繋がる。キャビティ１ａには、樹脂注入孔部１ｂから樹脂材料が流し込まれる。樹脂注入孔部１ｂの内径は、上側から下側に向かうに従って小さくなる。 The second holding member 21 has a second holding hole 21a that penetrates the second holding member 21 in the vertical direction Z. The molded portion 40 is held inside the second holding hole 21a. The molding portion 40 is a portion for molding the second large diameter portion BD2. The molding portion 22 is held inside the second holding hole 21a on the upper side of the molding portion 40. The molding portion 22 is a portion for molding the third small diameter portion SD3. The molding portion 22 has a resin injection hole portion 1b that opens on the upper side. The resin injection hole portion 1b is connected to the upper end of the cavity 1a. A resin material is poured into the cavity 1a from the resin injection hole 1b. The inner diameter of the resin injection hole portion 1b decreases from the upper side to the lower side.

第３金型部材３０は、左右方向Ｙに延びる一対の成形部３１を有する。すなわち、樹脂成形金型１は、一対の成形部３１を有する。一対の成形部３１は、互いに左右方向Ｙに隙間を対向して配置される。一対の成形部３１は、それぞれ挿入孔１ｃの左右方向Ｙの両側から挿入される。一対の成形部３１の左右方向Ｙの隙間は、キャビティ１ａのうち第２小径部ＳＤ２を成形する部分である。 The third mold member 30 has a pair of molding portions 31 extending in the left-right direction Y. That is, the resin molding die 1 has a pair of molding portions 31. The pair of molding portions 31 are arranged so as to face each other in the left-right direction Y with a gap facing each other. The pair of molding portions 31 are inserted from both sides of the insertion hole 1c in the left-right direction Y, respectively. The gap in the left-right direction Y of the pair of molding portions 31 is a portion of the cavity 1a for molding the second small diameter portion SD2.

成形部３１は、成形部３１の上面から下側に窪む溝部３２を有する。溝部３２は、左右方向Ｙに延びる。溝部３２の径方向内端部は、成形部４０の後述する空洞部４４よりも径方向外側に位置する。溝部３２の径方向内端部の上側には、成形部４０が配置される。溝部３２の径方向外端部は、第１金型部材１０および第２金型部材２０よりも径方向外側に位置し、樹脂成形金型１の外部に露出する。 The molding portion 31 has a groove portion 32 that is recessed downward from the upper surface of the molding portion 31. The groove portion 32 extends in the left-right direction Y. The radial inner end of the groove 32 is located radially outward of the cavity 44 of the molding 40, which will be described later. The molding portion 40 is arranged on the upper side of the radial inner end portion of the groove portion 32. The radial outer end of the groove 32 is located radially outside the first mold member 10 and the second mold member 20, and is exposed to the outside of the resin molding mold 1.

図２から図６に示すように、成形部４０は、成形部本体４０ａと、鍔部４０ｂと、を有する。成形部本体４０ａは、略直方体状である。図３に示すように、成形部本体４０ａの上下方向Ｚに沿って視た形状は、左右方向Ｙに長い角丸長方形状である。図２および図４に示すように、鍔部４０ｂは、成形部本体４０ａの上端部から左右方向Ｙの両側に突出する。鍔部４０ｂは、前後方向Ｘに長い直方体状である。 As shown in FIGS. 2 to 6, the molding portion 40 includes a molding portion main body 40a and a flange portion 40b. The molded portion main body 40a has a substantially rectangular parallelepiped shape. As shown in FIG. 3, the shape of the molded portion main body 40a viewed along the vertical direction Z is a rectangular shape with rounded corners long in the horizontal direction Y. As shown in FIGS. 2 and 4, the flange portion 40b projects from the upper end portion of the molding portion main body 40a to both sides in the left-right direction Y. The collar portion 40b has a rectangular parallelepiped shape that is long in the front-rear direction X.

図２から図５に示すように、成形部４０は、成形部本体４０ａを上下方向Ｚに貫通する空洞部４４を有する。空洞部４４は、中心軸Ｊに沿って配置される。空洞部４４の内側面は、中心軸Ｊを中心とする円筒状である。本実施形態において空洞部４４の上下方向Ｚと直交する方向の寸法、すなわち空洞部４４の内径は、上下方向Ｚに沿って一様である。なお、本明細書において「寸法が一様」であるとは、寸法が厳密に同じであることに加えて、寸法が略同じであることを含む。空洞部４４は、キャビティ１ａのうち第２大径部ＢＤ２を成形する部分である。すなわち、空洞部４４には、樹脂材料が流し込まれる。 As shown in FIGS. 2 to 5, the molding portion 40 has a cavity portion 44 penetrating the molding portion main body 40a in the vertical direction Z. The cavity 44 is arranged along the central axis J. The inner surface of the cavity 44 has a cylindrical shape centered on the central axis J. In the present embodiment, the dimension in the direction orthogonal to the vertical direction Z of the hollow portion 44, that is, the inner diameter of the hollow portion 44 is uniform along the vertical direction Z. In addition, in the present specification, "uniform dimensions" includes that the dimensions are exactly the same and that the dimensions are substantially the same. The cavity 44 is a portion of the cavity 1a that forms the second large diameter portion BD2. That is, the resin material is poured into the cavity 44.

図３および図５に示すように、成形部４０は、溝部４０ｃを有する。溝部４０ｃは、成形部４０の下面から上側に窪む。溝部４０ｃは、成形部４０の左右方向Ｙの一端から他端まで左右方向Ｙに延びる。図３に示すように、溝部４０ｃは、成形部４０の下面における前後方向Ｘの中央に設けられる。溝部４０ｃの下側から視た形状は、左右方向Ｙに長い長方形状である。溝部４０ｃの前後方向Ｘの寸法は、空洞部４４の内径よりも小さい。溝部４０ｃは、空洞部４４によって左右方向Ｙの両側に分断される。 As shown in FIGS. 3 and 5, the molded portion 40 has a groove portion 40c. The groove portion 40c is recessed upward from the lower surface of the molding portion 40. The groove portion 40c extends in the left-right direction Y from one end to the other end of the molding portion 40 in the left-right direction Y. As shown in FIG. 3, the groove portion 40c is provided at the center of the front-rear direction X on the lower surface of the molding portion 40. The shape seen from the lower side of the groove portion 40c is a rectangular shape long in the left-right direction Y. The dimension of the groove portion 40c in the front-rear direction X is smaller than the inner diameter of the cavity portion 44. The groove portion 40c is divided into both sides in the left-right direction Y by the cavity portion 44.

図５に示すように、成形部４０は、上下方向Ｚに積層される複数の層部を有する。複数の層部は、第１層部４１と、第２層部４２と、第３層部４３と、を含む。本実施形態において、成形部４０は、第１層部４１と、第２層部４２と、第３層部４３と、が上下方向Ｚに積層されて構成される。第１層部４１は、最も下側に配置される層部である。第２層部４２は、第１層部４１の上側に積層される層部である。第３層部４３は、第２層部４２の上側に積層される層部である。第３層部４３は、最も上側に配置される層部である。 As shown in FIG. 5, the molded portion 40 has a plurality of layered portions stacked in the vertical direction Z. The plurality of layer portions include a first layer portion 41, a second layer portion 42, and a third layer portion 43. In the present embodiment, the molding portion 40 is configured by stacking the first layer portion 41, the second layer portion 42, and the third layer portion 43 in the vertical direction Z. The first layer portion 41 is a layer portion arranged on the lowermost side. The second layer portion 42 is a layer portion laminated on the upper side of the first layer portion 41. The third layer portion 43 is a layer portion laminated on the upper side of the second layer portion 42. The third layer portion 43 is a layer portion arranged on the uppermost side.

第１層部４１は、第１層部４１を上下方向Ｚに貫通する第１貫通孔４１ａを有する。第２層部４２は、第２層部４２を上下方向Ｚに貫通する第２貫通孔４２ａを有する。第３層部４３は、第３層部４３を上下方向Ｚに貫通する第３貫通孔４３ａを有する。第１貫通孔４１ａと第２貫通孔４２ａと第３貫通孔４３ａとは、互いに繋がり、上述した空洞部４４を構成する。すなわち、空洞部４４は、上下方向Ｚに延び、第１層部４１と第２層部４２と第３層部４３とに跨って配置される。 The first layer portion 41 has a first through hole 41a that penetrates the first layer portion 41 in the vertical direction Z. The second layer portion 42 has a second through hole 42a that penetrates the second layer portion 42 in the vertical direction Z. The third layer portion 43 has a third through hole 43a that penetrates the third layer portion 43 in the vertical direction Z. The first through hole 41a, the second through hole 42a, and the third through hole 43a are connected to each other to form the above-mentioned cavity 44. That is, the cavity portion 44 extends in the vertical direction Z and is arranged so as to straddle the first layer portion 41, the second layer portion 42, and the third layer portion 43.

第２層部４２の気体の透過率は、第１層部４１の気体の透過率および第３層部４３の気体の透過率と異なる。ここで、本明細書において「気体の透過率」とは、気体の通りやすさを示す指標であり、例えば、漏れ試験によって計測される。すなわち、ある対象に対して漏れ試験を行った場合に、気体の漏れ量が多いほど気体の透過率は大きく、気体の漏れ量が少ないほど気体の透過率は小さい。漏れ試験としては、特に限定されず、例えば、ＪＩＳ２３３２：２０１２に規定される圧力変化による漏れ試験方法を用いることができる。 The gas permeability of the second layer portion 42 is different from the gas permeability of the first layer portion 41 and the gas permeability of the third layer portion 43. Here, in the present specification, the "gas permeability" is an index indicating the ease of passage of gas, and is measured by, for example, a leak test. That is, when a leak test is performed on a certain object, the larger the amount of gas leakage, the larger the gas permeability, and the smaller the gas leakage amount, the smaller the gas permeability. The leak test is not particularly limited, and for example, a leak test method based on a pressure change specified in JIS2332: 2012 can be used.

例えば、樹脂成形金型を用いて、樹脂成形品として上下方向Ｚに延びる柱状部材を成形する場合、上下方向Ｚの一部において柱状部材にヒケが生じて、部分的に柱状部材の成型精度が低下する場合があった。上下方向Ｚの一部において柱状部材にヒケが生じる原因としては、例えば、樹脂材料が流し込まれる空洞部内に空気が残留し、樹脂材料が充填されにくい部分が生じること、空洞部を有する成形部の温度が上下方向Ｚで異なる箇所があり、部分的に成形収縮率が大きくなる部分が生じること、等が考えられる。 For example, when a columnar member extending in the vertical direction Z is molded as a resin molded product using a resin molding die, sink marks occur in the columnar member in a part of the vertical direction Z, and the molding accuracy of the columnar member is partially improved. It could be reduced. The causes of sink marks on the columnar member in a part of the vertical direction Z include, for example, that air remains in the cavity into which the resin material is poured and a portion where the resin material is difficult to be filled is generated, and that the molded portion having the cavity is formed. It is conceivable that there are places where the temperature differs in the vertical direction Z, and there are parts where the molding shrinkage rate becomes large.

これに対して、本実施形態によれば、第１層部４１と第３層部４３との上下方向Ｚの間に配置される第２層部４２の気体の透過率が、第１層部４１の気体の透過率および第３層部４３の気体の透過率と異なる。そのため、第１層部４１から第３層部４３においては、上下方向Ｚに隣り合う層部同士の気体の透過率が異なる。これにより、各層部の気体の透過率を柱状部材のヒケが生じやすい部分に合わせた値としやすい。 On the other hand, according to the present embodiment, the gas transmittance of the second layer portion 42 arranged between the first layer portion 41 and the third layer portion 43 in the vertical direction Z is the first layer portion. It is different from the gas permeability of 41 and the gas permeability of the third layer portion 43. Therefore, in the first layer portion 41 to the third layer portion 43, the gas transmittances of the adjacent layer portions in the vertical direction Z are different. As a result, it is easy to set the gas transmittance of each layer portion to a value that matches the portion of the columnar member where sink marks are likely to occur.

具体的には、成形される柱状部材、すなわち本実施形態では第２大径部ＢＤ２においてヒケが生じやすい部分を成形する層部の気体の透過率を大きくすることで、層部内を通して、空洞部４４内から空気を抜くことができる。これにより、空洞部４４内に空気が残留しにくく、空洞部４４内において樹脂材料が充填されにくい部分が生じることを抑制できる。したがって、成形される第２大径部ＢＤ２に部分的にヒケが生じることを抑制できる。 Specifically, by increasing the gas permeability of the columnar member to be molded, that is, the layer portion that forms the portion of the second large-diameter portion BD2 where sink marks are likely to occur in the present embodiment, the hollow portion is passed through the layer portion. Air can be evacuated from the inside of 44. As a result, it is possible to prevent air from remaining in the cavity 44 and to prevent a portion in the cavity 44 from being filled with the resin material. Therefore, it is possible to prevent the second large-diameter portion BD2 to be molded from having a partial sink mark.

また、例えば、層部の気体の透過率を大きくする場合、層部の材質を多孔性として気孔率を大きくすることが考えられる。気孔率が大きくなるほど、物質の熱伝導率は小さくなる。熱伝導率が小さくなると、成形時の層部の温度が低くなりやすく、樹脂成形品の成形収縮率を小さくできる。これにより、第２大径部ＢＤ２においてヒケが生じやすい部分を成形する層部の気体の透過率を大きくすることで、層部の熱伝導率を小さくでき、当該層部によって成形される部分の成形収縮率を小さくできる。したがって、成形される第２大径部ＢＤ２において部分的に成形収縮率が大きくなることを抑制でき、第２大径部ＢＤ２に部分的にヒケが生じることを抑制できる。 Further, for example, when increasing the gas permeability of the layer portion, it is conceivable to increase the porosity by making the material of the layer portion porous. The higher the porosity, the lower the thermal conductivity of the substance. When the thermal conductivity becomes small, the temperature of the layer portion at the time of molding tends to be low, and the molding shrinkage of the resin molded product can be made small. As a result, the thermal conductivity of the layer portion can be reduced by increasing the gas transmittance of the layer portion that forms the portion of the second large-diameter portion BD2 where sink marks are likely to occur, and the portion formed by the layer portion can be reduced. The molding shrinkage rate can be reduced. Therefore, it is possible to suppress a partial increase in the molding shrinkage rate in the second large diameter portion BD2 to be molded, and it is possible to suppress a partial sink mark in the second large diameter portion BD2.

以上のようにして、本実施形態によれば、成形される柱状部材の上下方向Ｚの一部においてヒケが生じることを抑制できる。これにより、柱状部材、すなわち本実施形態では第２大径部ＢＤ２を延びる方向の全体に亘って精度よく成形できる樹脂成形金型１が得られる。 As described above, according to the present embodiment, it is possible to suppress the occurrence of sink marks in a part of the columnar member to be molded in the vertical direction Z. As a result, a columnar member, that is, a resin molding die 1 that can be accurately molded over the entire direction extending the second large diameter portion BD2 in the present embodiment can be obtained.

本実施形態において第２層部４２の気体の透過率は、第１層部４１の気体の透過率および第３層部４３の気体の透過率よりも大きい。例えば、成形される柱状部材においてヒケが生じやすい部分は、柱状部材における上端部と下端部との間の中間部分となりやすい。そのため、第２層部４２の気体の透過率を大きくすることで、柱状部材の中間部分にヒケが生じることを抑制できる。したがって、第２大径部ＢＤ２を上下方向Ｚの全体に亘ってより精度よく成形できる。第１層部４１の気体の透過率と第３層部４３の気体の透過率とは、例えば、同じである。 In the present embodiment, the gas permeability of the second layer portion 42 is larger than the gas permeability of the first layer portion 41 and the gas permeability of the third layer portion 43. For example, a portion of a columnar member to be molded that is prone to sink marks is likely to be an intermediate portion between the upper end and the lower end of the columnar member. Therefore, by increasing the gas transmittance of the second layer portion 42, it is possible to suppress the occurrence of sink marks in the intermediate portion of the columnar member. Therefore, the second large-diameter portion BD2 can be molded more accurately over the entire vertical direction Z. The transmittance of the gas in the first layer portion 41 and the transmittance of the gas in the third layer portion 43 are, for example, the same.

第２層部４２の上下方向Ｚの寸法Ｈ２は、第１層部４１の上下方向Ｚの寸法Ｈ１よりも小さい。第３層部４３の上下方向Ｚの寸法Ｈ３は、第２層部４２の上下方向Ｚの寸法Ｈ２よりも小さい。第１層部４１の上下方向Ｚの寸法Ｈ１は、空洞部４４の第１層部４１に配置される部分における上下方向Ｚの寸法である。第２層部４２の上下方向Ｚの寸法Ｈ２は、空洞部４４の第２層部４２に配置される部分における上下方向Ｚの寸法である。第３層部４３の上下方向Ｚの寸法Ｈ３は、空洞部４４の第３層部４３に配置される部分における上下方向Ｚの寸法である。すなわち、空洞部４４の第１層部４１に配置される部分における上下方向Ｚの寸法Ｈ１は、空洞部４４の第３層部４３に配置される部分における上下方向Ｚの寸法Ｈ３よりも大きい。これにより、第２層部４２は、成形部４０において上下方向Ｚの中心よりも上側寄りに配置される。 The dimension H2 in the vertical direction Z of the second layer portion 42 is smaller than the dimension H1 in the vertical direction Z of the first layer portion 41. The dimension H3 in the vertical direction Z of the third layer portion 43 is smaller than the dimension H2 in the vertical direction Z of the second layer portion 42. The vertical Z dimension H1 of the first layer portion 41 is the vertical Z dimension of the portion of the hollow portion 44 arranged in the first layer portion 41. The vertical Z dimension H2 of the second layer portion 42 is the vertical Z dimension of the portion of the hollow portion 44 arranged in the second layer portion 42. The vertical Z dimension H3 of the third layer portion 43 is the vertical Z dimension of the portion of the hollow portion 44 arranged in the third layer portion 43. That is, the dimension H1 in the vertical direction Z in the portion of the hollow portion 44 arranged in the first layer portion 41 is larger than the dimension H3 in the vertical direction Z in the portion arranged in the third layer portion 43 of the cavity portion 44. As a result, the second layer portion 42 is arranged in the molding portion 40 on the upper side of the center in the vertical direction Z.

ここで、本発明者らの実験等により、柱状部材においてヒケが生じやすい中間部分は、上下方向Ｚの中心よりも上側寄りになりやすいことが分かった。そのため、第１層部４１および第３層部４３よりも気体の透過率が大きい第２層部４２を上側寄りに配置することで、より効果的にヒケが生じることを抑制することができる。したがって、第２大径部ＢＤ２を上下方向Ｚの全体に亘ってより精度よく成形できる。 Here, from experiments by the present inventors, it has been found that the intermediate portion of the columnar member where sink marks are likely to occur tends to be closer to the upper side than the center in the vertical direction Z. Therefore, by arranging the second layer portion 42 having a higher gas transmittance than the first layer portion 41 and the third layer portion 43 toward the upper side, it is possible to suppress the occurrence of sink marks more effectively. Therefore, the second large-diameter portion BD2 can be molded more accurately over the entire vertical direction Z.

また、例えば、成形される柱状部材が円柱状である場合に、ヒケが生じる部分が上下方向Ｚの中間部分となりやすく、特に中心よりも上側寄りになりやすい。そのため、本実施形態のように円柱状の第２大径部ＢＤ２を成形するために空洞部４４の内側面が円筒状である場合に、第２層部４２の気体の透過率を大きくすることで、特に効果的にヒケを抑制しやすい。 Further, for example, when the columnar member to be molded is columnar, the portion where sink marks occur tends to be an intermediate portion in the vertical direction Z, and particularly tends to be closer to the upper side than the center. Therefore, when the inner surface of the cavity 44 is cylindrical in order to form the columnar second large-diameter portion BD2 as in the present embodiment, the gas transmittance of the second layer 42 should be increased. Therefore, it is easy to suppress sink marks especially effectively.

また、本実施形態の成形部４０によって成形される第２大径部ＢＤ２は、スプールバルブＳＶにおいて摺動する部分であり、外径が上下方向Ｚの全体に亘って精度よく一様であることが求められる。そのため、摺動する円柱状の部材を成形するために空洞部４４の内径が上下方向Ｚに沿って一様である場合に、柱状部材を上下方向Ｚの全体に亘って精度よく成形できる効果は、特に有用である。 Further, the second large diameter portion BD2 molded by the molding portion 40 of the present embodiment is a sliding portion in the spool valve SV, and the outer diameter is accurately uniform over the entire vertical direction Z. Is required. Therefore, when the inner diameter of the cavity 44 is uniform along the vertical direction Z in order to form the sliding columnar member, the effect that the columnar member can be accurately formed over the entire vertical direction Z is effective. , Especially useful.

本実施形態において複数の層部の少なくとも一つは、多孔性を有する。本実施形態では、第１層部４１と第２層部４２と第３層部４３とのうちの第２層部４２が多孔性を有する。これにより、第２層部４２の気体の透過率を容易かつ好適に大きくすることができる。したがって、よりヒケが生じることを抑制できる。 In this embodiment, at least one of the plurality of layers has porosity. In the present embodiment, the second layer portion 42 of the first layer portion 41, the second layer portion 42, and the third layer portion 43 has porosity. As a result, the gas transmittance of the second layer portion 42 can be easily and preferably increased. Therefore, it is possible to suppress the occurrence of sink marks.

第２層部４２は、第２貫通孔４２ａの内周面が空洞部４４内に露出する。すなわち、第２層部４２は、多孔性を有し、一部が空洞部４４内に露出する多孔質部である。これにより、成形部４０は、多孔質部を有する。ここで、本明細書において「層部の一部が空洞部内に露出する」とは、層部の一部が空洞部の内側面の一部を構成することを含む。 In the second layer portion 42, the inner peripheral surface of the second through hole 42a is exposed in the cavity portion 44. That is, the second layer portion 42 is a porous portion that is porous and a part of the second layer portion 42 is exposed in the cavity portion 44. As a result, the molded portion 40 has a porous portion. Here, in the present specification, "a part of the layer portion is exposed in the cavity portion" includes that a part of the layer portion constitutes a part of the inner surface surface of the cavity portion.

成形部４０は、多孔質部である第２層部４２と成形部４０の外部とを繋ぐ穴部４７を有する。例えば、空洞部４４内に空気が残留すると、上述したように樹脂成形品にヒケが生じる場合がある他、残留した空気が圧縮されて燃焼し、樹脂成形品の一部が炭化するガス焼けが生じる場合がある。これに対して、例えば、成形部を分割して分割された成形部同士の分割面に排気孔を設けて、空洞部内の排気を行うことが考えられる。しかし、この場合、充填される樹脂材料が分割面を超えると排気孔が閉塞され、空洞部内の排気が不十分になる場合があった。また、排気孔にも樹脂材料が充填され、バリが生じる場合もあった。 The molding portion 40 has a hole portion 47 that connects the second layer portion 42, which is a porous portion, and the outside of the molding portion 40. For example, if air remains in the cavity 44, sink marks may occur in the resin molded product as described above, and the remaining air is compressed and burned, resulting in gas burning in which a part of the resin molded product is carbonized. May occur. On the other hand, for example, it is conceivable to divide the molded portion and provide an exhaust hole on the divided surface of the divided molded portions to exhaust the inside of the cavity. However, in this case, when the resin material to be filled exceeds the dividing surface, the exhaust holes may be blocked and the exhaust in the cavity may be insufficient. In addition, the exhaust holes are also filled with a resin material, which may cause burrs.

これに対して、本実施形態によれば、空洞部４４内の空気を、多孔質部である第２層部４２の空洞部４４内に露出する部分から、穴部４７を介して、成形部４０の外部に排気することができる。そのため、空洞部４４内に露出する多孔質部の部分をヒケおよびガス焼けが生じやすい箇所に配置することで、成形時に空洞部４４内の排気を十分に行うことができる。したがって、樹脂成形品の成形時に空洞部４４内に空気が残留することを抑制でき、樹脂成形品にヒケが生じることを抑制できるとともに、ガス焼けが生じることを抑制できる。また、空洞部４４内に露出する部分は、多孔性を有する多孔質部であるため樹脂材料が充填されることを抑制でき、樹脂成形品にバリが生じることも抑制できる。また、上述したように第２層部４２は、気体の透過率が比較的高いため、第２層部４２に穴部４７が繋がることで、より空洞部４４内の排気を行いやすい。 On the other hand, according to the present embodiment, the air in the cavity 44 is exposed from the portion exposed in the cavity 44 of the second layer 42, which is a porous portion, through the hole 47, and is formed through the molding portion. It can be exhausted to the outside of 40. Therefore, by arranging the portion of the porous portion exposed in the cavity portion 44 at a location where sink marks and gas burning are likely to occur, the inside of the cavity portion 44 can be sufficiently exhausted at the time of molding. Therefore, it is possible to suppress the residual air in the cavity 44 during molding of the resin molded product, suppress the occurrence of sink marks in the resin molded product, and suppress the occurrence of gas burning. Further, since the portion exposed in the cavity 44 is a porous portion having porosity, it is possible to suppress the filling of the resin material and the occurrence of burrs in the resin molded product. Further, as described above, since the second layer portion 42 has a relatively high gas transmittance, the hole portion 47 is connected to the second layer portion 42, so that the inside of the cavity portion 44 can be more easily exhausted.

穴部４７は、第１穴部４５と、第２穴部４６と、を有する。第１穴部４５は、上下方向Ｚに延びる。第１穴部４５は、空洞部４４よりも径方向外側において、成形部４０の上側の面と成形部４０の下側の面とのうちの少なくとも一方に開口する。本実施形態では、第１穴部４５は、成形部４０の下側の面に開口する。これにより、空洞部４４内から第２層部４２を介して穴部４７に流入した空気を成形部４０の下側から排出できる。 The hole 47 has a first hole 45 and a second hole 46. The first hole portion 45 extends in the vertical direction Z. The first hole portion 45 opens to at least one of the upper surface of the molded portion 40 and the lower surface of the molded portion 40 on the radial outer side of the hollow portion 44. In the present embodiment, the first hole portion 45 opens on the lower surface of the molding portion 40. As a result, the air that has flowed into the hole 47 from the inside of the cavity 44 through the second layer 42 can be discharged from the lower side of the molding 40.

図１に示すように、本実施形態では、第１穴部４５の下側の開口は、溝部３２に面する。そのため、第１穴部４５の下側の開口から排出された空気は、溝部３２を通って樹脂成形金型１の外部に排出される。このように、成形部４０の上下方向Ｚのいずれか一方側から空気を排出できることで、本実施形態のように複数の成形部が上下方向Ｚに積層される場合に、成形部同士の間に溝部３２等を設けて成形部４０から排出された空気を容易に樹脂成形金型１の外部に排出できる。 As shown in FIG. 1, in the present embodiment, the lower opening of the first hole portion 45 faces the groove portion 32. Therefore, the air discharged from the lower opening of the first hole portion 45 is discharged to the outside of the resin molding mold 1 through the groove portion 32. As described above, since air can be discharged from any one side of the molded portion 40 in the vertical direction Z, when a plurality of molded portions are laminated in the vertical direction Z as in the present embodiment, between the molded portions. The groove portion 32 or the like is provided so that the air discharged from the molding portion 40 can be easily discharged to the outside of the resin molding mold 1.

図５に示すように、第１穴部４５は、第２層部４２と繋がる。そのため、空洞部４４から第２層部４２内に流入した空気を、直接的に第１穴部４５を介して成形部４０の外部に排出できる。第１穴部４５は、第２層部４２の上端部から直線状に下側に延びて、成形部４０の下面に開口する。図２から図４に示すように、第１穴部４５の下側の開口は、溝部４０ｃの底面に開口する。ここで、溝部４０ｃは、第３金型部材３０における溝部３２と上下方向Ｚに対向して配置される。これにより、第１穴部４５の下側の開口から排出された空気を溝部４０ｃおよび溝部３２を介して樹脂成形金型１の外部に排出することができ、より空気を排出しやすい。 As shown in FIG. 5, the first hole portion 45 is connected to the second layer portion 42. Therefore, the air that has flowed into the second layer portion 42 from the cavity portion 44 can be directly discharged to the outside of the molding portion 40 through the first hole portion 45. The first hole portion 45 extends linearly downward from the upper end portion of the second layer portion 42 and opens to the lower surface of the molded portion 40. As shown in FIGS. 2 to 4, the lower opening of the first hole 45 opens to the bottom surface of the groove 40c. Here, the groove portion 40c is arranged so as to face the groove portion 32 in the third mold member 30 in the vertical direction Z. As a result, the air discharged from the lower opening of the first hole portion 45 can be discharged to the outside of the resin molding die 1 through the groove portion 40c and the groove portion 32, and the air can be more easily discharged.

図５に示すように、第１穴部４５の上端部は、上側に凸となる半円状である。第１穴部４５は、複数設けられる。図３に示すように、本実施形態では、第１穴部４５は、例えば、２つ設けられる。２つの第１穴部４５は、中心軸Ｊを挟んで左右方向Ｙの両側に配置される。第１穴部４５の上下方向Ｚと直交する断面形状は、円形状である。第１穴部４５の内径は、空洞部４４の内径よりも小さい。 As shown in FIG. 5, the upper end portion of the first hole portion 45 has a semicircular shape that is convex upward. A plurality of first hole portions 45 are provided. As shown in FIG. 3, in the present embodiment, for example, two first hole portions 45 are provided. The two first hole portions 45 are arranged on both sides in the left-right direction Y with the central axis J in between. The cross-sectional shape of the first hole portion 45 orthogonal to the vertical direction Z is a circular shape. The inner diameter of the first hole 45 is smaller than the inner diameter of the cavity 44.

図５および図６に示すように、第２穴部４６は、第１穴部４５と繋がる。第２穴部４６は、上下方向Ｚに沿って複数並んで設けられる。本実施形態において第２穴部４６は、第２穴部４６ａと、第２穴部４６ｂと、第２穴部４６ｃと、の３つ設けられる。第２穴部４６ａと第２穴部４６ｂと第２穴部４６ｃとは、下側から上側に向かってこの順に等間隔に並んで配置される。各第２穴部４６ａ〜４６ｃは、空洞部４４の径方向外側を囲む環状である。より詳細には、第２穴部４６ａ〜４６ｃは、中心軸Ｊを中心とする円環状である。第２穴部４６ａ〜４６ｃの周方向と直交する断面形状は、円形状である。第２穴部４６ａと第２穴部４６ｂと第２穴部４６ｃとは、上下方向Ｚに重なり合う。 As shown in FIGS. 5 and 6, the second hole portion 46 is connected to the first hole portion 45. A plurality of second hole portions 46 are provided side by side along the vertical direction Z. In the present embodiment, the second hole portion 46 is provided with three portions, a second hole portion 46a, a second hole portion 46b, and a second hole portion 46c. The second hole portion 46a, the second hole portion 46b, and the second hole portion 46c are arranged side by side at equal intervals in this order from the lower side to the upper side. Each of the second hole portions 46a to 46c is an annular shape that surrounds the radial outer side of the cavity portion 44. More specifically, the second hole portions 46a to 46c are annular around the central axis J. The cross-sectional shape of the second hole portions 46a to 46c orthogonal to the circumferential direction is a circular shape. The second hole portion 46a, the second hole portion 46b, and the second hole portion 46c overlap each other in the vertical direction Z.

第２穴部４６ａは、第１層部４１に配置される。第２穴部４６ｂおよび第２穴部４６ｃは、多孔質部である第２層部４２に配置される。そのため、第２穴部４６ｂ，４６ｃによって第２層部４２の周方向全体から空気を穴部４７内に取り込むことができ、取り込んだ空気を、第１穴部４５を介して成形部４０の外部に排出することができる。したがって、より空洞部４４内の排気を行いやすい。 The second hole portion 46a is arranged in the first layer portion 41. The second hole portion 46b and the second hole portion 46c are arranged in the second layer portion 42, which is a porous portion. Therefore, the second hole portions 46b and 46c allow air to be taken into the hole portion 47 from the entire circumferential direction of the second layer portion 42, and the taken-in air is taken into the outside of the molding portion 40 via the first hole portion 45. Can be discharged to. Therefore, it is easier to exhaust the inside of the cavity 44.

図３に示すように、第２穴部４６は、上下方向Ｚに沿って視て第１穴部４５と重なる。図５および図６に示すように、各第１穴部４５は、それぞれ複数の第２穴部４６を繋ぐ。そのため、複数の第２穴部４６から穴部４７内に取り込んだ空気を、第１穴部４５を介して成形部４０の外部に排出することができる。これにより、より空洞部４４内の排気を行いやすい。 As shown in FIG. 3, the second hole portion 46 overlaps with the first hole portion 45 when viewed along the vertical direction Z. As shown in FIGS. 5 and 6, each first hole portion 45 connects a plurality of second hole portions 46, respectively. Therefore, the air taken into the hole 47 from the plurality of second hole 46 can be discharged to the outside of the molding 40 through the first hole 45. This makes it easier to exhaust the inside of the cavity 44.

本実施形態において成形部４０は、単一の部材である。すなわち、各層部は、それぞれ単一の部材である成形部４０の部分である。そのため、上下方向Ｚに隣り合う各層部同士の間に隙間が生じることがなく、成形される第２大径部ＢＤ２の成形精度を向上できる。成形部４０は、例えば、３Ｄプリンターを用いて製造される。その際、各層部の気体の透過率は、成形部４０を製造するための金属粉末等の素材に照射されるレーザーの出力を変化させることで、層部ごとに異ならせることができる。具体的には、レーザーの出力を小さくするほど、層部の気体の透過率が高くなる。そのため、本実施形態の成形部４０を製造する際には、比較的高いレーザーの出力で第１層部４１を成形した後に、レーザーの出力を低下させて第２層部４２を成形し、再びレーザーの出力を上昇させて第３層部４３を成形する。 In the present embodiment, the molding unit 40 is a single member. That is, each layer portion is a portion of the molding portion 40, which is a single member. Therefore, there is no gap between the adjacent layer portions in the vertical direction Z, and the molding accuracy of the second large-diameter portion BD2 to be molded can be improved. The molding unit 40 is manufactured using, for example, a 3D printer. At that time, the gas transmittance of each layer portion can be made different for each layer portion by changing the output of the laser irradiating the material such as metal powder for producing the molded portion 40. Specifically, the smaller the laser output, the higher the transmittance of the gas in the layer. Therefore, when manufacturing the molded portion 40 of the present embodiment, after molding the first layer portion 41 with a relatively high laser output, the laser output is reduced to mold the second layer portion 42, and then again. The output of the laser is increased to form the third layer portion 43.

本発明は上述の実施形態に限られず、他の構成を採用することもできる。以下の説明においては、上記実施形態と同様の構成については、適宜同一の符号を付す等により説明を省略する場合がある。 The present invention is not limited to the above-described embodiment, and other configurations may be adopted. In the following description, the same configurations as those in the above embodiment may be omitted by appropriately assigning the same reference numerals and the like.

成形部４０は、第２層部４２の気体の透過率が、第１層部４１の気体の透過率および第３層部４３の気体の透過率と異なるならば、特に限定されない。第２層部４２の気体の透過率が第１層部４１の気体の透過率および第３層部４３の気体の透過率より小さくてもよい。また、第１層部４１の気体の透過率と第３層部４３の気体の透過率は、互いに異なってもよい。また、各層部の数は、４つ以上であってもよい。また、各層部の上下方向Ｚの寸法Ｈ１，Ｈ２，Ｈ３は特に限定されない。 The molding unit 40 is not particularly limited as long as the gas permeability of the second layer portion 42 is different from the gas permeability of the first layer portion 41 and the gas permeability of the third layer portion 43. The gas permeability of the second layer portion 42 may be smaller than the gas permeability of the first layer portion 41 and the gas permeability of the third layer portion 43. Further, the transmittance of the gas in the first layer portion 41 and the transmittance of the gas in the third layer portion 43 may be different from each other. Further, the number of each layer portion may be four or more. Further, the dimensions H1, H2, and H3 of each layer portion in the vertical direction Z are not particularly limited.

また、各層部は、多孔性を有していなくてもよい。また、各層部は、部分的に多孔性を有してもよい。第２層部４２における空洞部４４の露出する一部のみが多孔質部であってもよい。また、第１層部４１および第３層部４３の少なくとも一方は、多孔質部であってもよい。また、第１層部４１および第３層部４３の少なくとも一方の一部のみが、多孔質部であってもよい。第１層部４１および第３層部４３の少なくとも一部が空洞部４４に露出する多孔質部であるならば、第２層部４２は多孔質部でなくてもよい。また、第１層部４１、第２層部４２および第３層部４３の全体が、多孔質部であってもよい。この場合、空洞部４４の内側面を構成する部分の全体が多孔質部となり、空洞部４４内の排気をより行いやすい。 Further, each layer portion does not have to have porosity. In addition, each layer may be partially porous. Only the exposed part of the cavity 44 in the second layer 42 may be a porous portion. Further, at least one of the first layer portion 41 and the third layer portion 43 may be a porous portion. Further, only a part of at least one of the first layer portion 41 and the third layer portion 43 may be a porous portion. If at least a part of the first layer portion 41 and the third layer portion 43 is a porous portion exposed to the cavity portion 44, the second layer portion 42 does not have to be a porous portion. Further, the entire first layer portion 41, the second layer portion 42, and the third layer portion 43 may be porous portions. In this case, the entire portion constituting the inner surface of the cavity 44 becomes a porous portion, and it is easier to exhaust the inside of the cavity 44.

また、穴部４７は、多孔質部と成形部４０の外部とを繋ぐならば特に限定されない。第１穴部４５は、成形部４０の上側の面に開口してもよいし、成形部４０の下側の面と成形部４０の上側の面との両方に開口してもよい。また、第１穴部４５の数および第２穴部４６の数は、特に限定されない。 Further, the hole portion 47 is not particularly limited as long as it connects the porous portion and the outside of the molded portion 40. The first hole portion 45 may be opened to the upper surface of the molded portion 40, or may be opened to both the lower surface of the molded portion 40 and the upper surface of the molded portion 40. The number of the first hole 45 and the number of the second hole 46 are not particularly limited.

また、成形部４０以外の成形部１３，１４，２２，３１が、成形部４０と同様の構成を有してもよい。これにより、スプールバルブＳＶの全体においてヒケおよびガス焼けが生じることを抑制でき、スプールバルブＳＶの全体を精度よく成形できる。 Further, the molding portions 13, 14, 22, and 31 other than the molding portion 40 may have the same configuration as the molding portion 40. As a result, sink marks and gas burns can be suppressed in the entire spool valve SV, and the entire spool valve SV can be accurately molded.

＜第２実施形態＞
図７から図１０に示す本実施形態の成形部２４０は、図７に示す樹脂成形品Ｍを成形するための樹脂成形金型の一部である。成形部２４０は、樹脂成形品Ｍの上端樹脂部ＭＵを成形する部分である。上端樹脂部ＭＵは、突出する複数の突起部として突起部Ｍａ，Ｍｂ，Ｍｃ等を有する。 <Second Embodiment>
The molding unit 240 of the present embodiment shown in FIGS. 7 to 10 is a part of a resin molding mold for molding the resin molded product M shown in FIG. 7. The molding portion 240 is a portion for molding the upper end resin portion MU of the resin molded product M. The upper end resin portion MU has protrusions Ma, Mb, Mc and the like as a plurality of protrusions that protrude.

図８に示すように、成形部２４０の軸方向に沿って視た形状は、正方形状である。成形部２４０は、成形部２４０を上下方向Ｚに貫通する貫通孔２４９を有する。図１０に示すように、貫通孔２４９の上下方向Ｚに沿って視た形状は、中心軸Ｊを中心とする円形状である。図７に示すように、成形部２４０は、第１層部２４１と、第２層部２４２と、第３層部２４３と、を有する。第２層部２４２は、多孔質部であり、第１層部２４１および第３層部２４３よりも気体の透過率が大きい。 As shown in FIG. 8, the shape of the molded portion 240 viewed along the axial direction is square. The molding portion 240 has a through hole 249 that penetrates the molding portion 240 in the vertical direction Z. As shown in FIG. 10, the shape seen along the vertical direction Z of the through hole 249 is a circular shape centered on the central axis J. As shown in FIG. 7, the molding portion 240 has a first layer portion 241, a second layer portion 242, and a third layer portion 243. The second layer portion 242 is a porous portion, and has a higher gas permeability than the first layer portion 241 and the third layer portion 243.

図１０に示すように、本実施形態において空洞部２４４は、貫通孔２４９の径方向外側に複数設けられる。複数の空洞部２４４は、貫通孔２４９の径方向外側を囲む。複数の空洞部２４４は、突起部Ｍａが成形される空洞部２４４ａと、突起部Ｍｂが成形される空洞部２４４ｂと、突起部Ｍｃが成形される空洞部２４４ｃと、を含む。 As shown in FIG. 10, a plurality of cavity portions 244 are provided on the radial outer side of the through hole 249 in the present embodiment. The plurality of cavities 244 surround the radial outside of the through hole 249. The plurality of cavity portions 244 include a cavity portion 244a in which the protrusion Ma is formed, a cavity portion 244b in which the protrusion Mb is formed, and a cavity portion 244c in which the protrusion Mc is formed.

図７に示すように、空洞部２４４ａは、上下方向Ｚに延びる。空洞部２４４ａは、突起部Ｍａの外形状の母型となる成形空洞部２４４ｄと、樹脂材料が注入される樹脂注入孔部２４４ｅと、を有する。成形空洞部２４４ｄは、第１層部２４１の下側の面から上側に窪む凹部である。成形空洞部２４４ｄの上端部は、第２層部２４２に配置される。成形空洞部２４４ｄの上側には、第２層部２４２の一部が配置される。樹脂注入孔部２４４ｅは、第３層部２４３の上側の面に開口する。樹脂注入孔部２４４ｅの下端は、凹部である成形空洞部２４４ｄの底面に開口する。成形空洞部２４４ｄには、樹脂注入孔部２４４ｅから樹脂材料が流し込まれる。樹脂注入孔部２４４ｅの内径は、上側から下側に向かうに従って小さくなる。 As shown in FIG. 7, the cavity portion 244a extends in the vertical direction Z. The cavity portion 244a has a molded cavity portion 244d that serves as a base for the outer shape of the protrusion Ma, and a resin injection hole portion 244e into which a resin material is injected. The molded cavity portion 244d is a recess recessed upward from the lower surface of the first layer portion 241. The upper end portion of the molding cavity portion 244d is arranged in the second layer portion 242. A part of the second layer portion 242 is arranged on the upper side of the molding cavity portion 244d. The resin injection hole portion 244e opens on the upper surface of the third layer portion 243. The lower end of the resin injection hole portion 244e opens to the bottom surface of the molded cavity portion 244d which is a recess. A resin material is poured into the molded cavity portion 244d from the resin injection hole portion 244e. The inner diameter of the resin injection hole portion 244e decreases from the upper side to the lower side.

空洞部２４４ａは、成形空洞部２４４ｄが第１層部２４１と第２層部２４２とに跨って配置され、樹脂注入孔部２４４ｅが第２層部２４２と第３層部２４３とに跨って配置されることで、第１層部２４１と第２層部２４２と第３層部２４３とに跨って配置される。成形空洞部２４４ｄの上端部は第２層部２４２に配置されるため、成形空洞部２４４ｄの上端部内には、第２層部２４２が露出する。これにより、成形空洞部２４４ｄ内の空気を多孔質部である第２層部２４２を介して成形部２４０の外部に排出できる。 In the cavity portion 244a, the molded cavity portion 244d is arranged so as to straddle the first layer portion 241 and the second layer portion 242, and the resin injection hole portion 244e is arranged so as to straddle the second layer portion 242 and the third layer portion 243. By doing so, it is arranged so as to straddle the first layer portion 241 and the second layer portion 242 and the third layer portion 243. Since the upper end portion of the molding cavity portion 244d is arranged in the second layer portion 242, the second layer portion 242 is exposed in the upper end portion of the molding cavity portion 244d. As a result, the air in the molding cavity portion 244d can be discharged to the outside of the molding portion 240 via the second layer portion 242 which is a porous portion.

上端樹脂部ＭＵのような複数の突起部Ｍａ，Ｍｂ，Ｍｃを有する複雑な形状は、成形時にヒケが生じやすい問題があった。これに対して、突起部Ｍａを成形する成形空洞部２４４ｄの上端部に空気抜き用の穴を開口させることも考えられるが、樹脂注入孔部２４４ｅが成形空洞部２４４ｄの上端部に繋がるため、空気抜き用の穴を開口させにくい。 A complicated shape having a plurality of protrusions Ma, Mb, and Mc such as the upper end resin portion MU has a problem that sink marks are likely to occur during molding. On the other hand, it is conceivable to open a hole for air bleeding at the upper end of the molding cavity 244d for molding the protrusion Ma, but since the resin injection hole 244e is connected to the upper end of the molding cavity 244d, air bleeding is possible. It is difficult to open a hole for this.

これに対して、本実施形態によれば、成形空洞部２４４ｄの上端部を多孔質部である第２層部２４２に配置することで、空気抜き用の穴を成形空洞部２４４ｄの上端部に開口させることなく、第２層部２４２を介して成形空洞部２４４ｄ内の空気を抜くことができる。これにより、ヒケが生じることを抑制でき、複雑な形状を有する上端樹脂部ＭＵを精度よく成形することができる。 On the other hand, according to the present embodiment, by arranging the upper end portion of the molding cavity portion 244d in the second layer portion 242 which is a porous portion, a hole for bleeding air is opened in the upper end portion of the molding cavity portion 244d. The air in the molding cavity portion 244d can be evacuated through the second layer portion 242 without causing the molding cavity portion 242. As a result, it is possible to suppress the occurrence of sink marks, and it is possible to accurately mold the upper end resin portion MU having a complicated shape.

空洞部２４４ｂは、空洞部２４４ａと同様に、成形空洞部２４４ｆと、樹脂注入孔部２４４ｇと、を有する。図示は省略するが、空洞部２４４ｃも、空洞部２４４ａ，２４４ｂと同様に、成形空洞部と、樹脂注入孔部と、を有する。 The cavity portion 244b has a molded cavity portion 244f and a resin injection hole portion 244g, similarly to the cavity portion 244a. Although not shown, the cavity portion 244c also has a molded cavity portion and a resin injection hole portion, similarly to the cavity portions 244a and 244b.

なお、図１０においては、成形部２４０を下側から視た際に、第２層部２４２が露出する部分を網掛けして示す。より詳細には、図１０において網掛けして示す部分は、第２層部２４２の一部で構成される成形空洞部の底面である。 In FIG. 10, the portion where the second layer portion 242 is exposed when the molded portion 240 is viewed from below is shaded. More specifically, the shaded portion in FIG. 10 is the bottom surface of the molded cavity portion composed of a part of the second layer portion 242.

図８に示すように、穴部２４７は、多孔質部である第２層部２４２と繋がる第３穴部２４８を有する。本実施形態において第３穴部２４８は、第２層部２４２に設けられる。第３穴部２４８は、複数設けられる。複数の第３穴部２４８は、第３穴部２４８ａと、第３穴部２４８ｂと、第３穴部２４８ｃと、を含む。第３穴部２４８ａ，２４８ｂは、成形部２４０の上下方向Ｚと直交する方向のうち前後方向Ｘの側面に開口する。第３穴部２４８ｃは、成形部２４０の上下方向Ｚと直交する方向のうち左右方向Ｙの側面に開口する。これにより、空洞部２４４から穴部２４７に流入した空気を、第３穴部２４８を介して上下方向Ｚと直交する方向に排出できる。これにより、他の成形部が成形部２４０の上下方向Ｚに積層される場合であっても、穴部２４７から樹脂成形金型の外部に空気を排出しやすい。 As shown in FIG. 8, the hole portion 247 has a third hole portion 248 connected to the second layer portion 242 which is a porous portion. In the present embodiment, the third hole portion 248 is provided in the second layer portion 242. A plurality of third hole portions 248 are provided. The plurality of third hole portions 248 include a third hole portion 248a, a third hole portion 248b, and a third hole portion 248c. The third hole portions 248a and 248b are opened on the side surface in the front-rear direction X in the direction orthogonal to the vertical direction Z of the molding portion 240. The third hole portion 248c opens on the side surface in the left-right direction Y in the direction orthogonal to the vertical direction Z of the molding portion 240. As a result, the air that has flowed into the hole 247 from the cavity 244 can be discharged in the direction orthogonal to the vertical direction Z via the third hole 248. As a result, even when other molded portions are laminated in the vertical direction Z of the molded portion 240, air can be easily discharged from the hole portion 247 to the outside of the resin molding die.

図９および図１０に示すように、第３穴部２４８ａは、前後方向Ｘに延びる。第３穴部２４８ａは、成形部２４０の前後方向Ｘの一方側の端部から他方側の端部まで延びる。第３穴部２４８ａは、貫通孔２４９を左右方向Ｙに挟んで２つ設けられる。第３穴部２４８ａの前後方向Ｘと直交する断面形状は、円形状である。 As shown in FIGS. 9 and 10, the third hole portion 248a extends in the front-rear direction X. The third hole portion 248a extends from one end of the molding portion 240 in the front-rear direction X to the other end. Two third hole portions 248a are provided with the through hole 249 sandwiched in the left-right direction Y. The cross-sectional shape of the third hole portion 248a orthogonal to the front-rear direction X is a circular shape.

第３穴部２４８ｂは、径方向のうちの前後方向Ｘに延びる。第３穴部２４８ｂは、２つの第３穴部２４８ａ同士の間において、第２層部２４２における左右方向Ｙの中心に配置される。第３穴部２４８ｂは、前後方向Ｘに沿って視て中心軸Ｊと重なる。第３穴部２４８ｂは、貫通孔２４９を前後方向Ｘに挟んで２つ設けられる。第３穴部２４８ｂの径方向内側の端部は、貫通孔２４９から径方向外側に離れて配置される。第３穴部２４８ｂの前後方向Ｘに直交する断面形状は、円形状である。第３穴部２４８ｂの中心は、第３穴部２４８ａの中心よりも上側に位置する。 The third hole portion 248b extends in the front-rear direction X in the radial direction. The third hole portion 248b is arranged between the two third hole portions 248a at the center of the second layer portion 242 in the left-right direction Y. The third hole portion 248b overlaps with the central axis J when viewed along the front-rear direction X. Two third hole portions 248b are provided with the through hole 249 sandwiched in the front-rear direction X. The radial inner end of the third hole 248b is arranged radially outward from the through hole 249. The cross-sectional shape of the third hole portion 248b orthogonal to the front-rear direction X is a circular shape. The center of the third hole portion 248b is located above the center of the third hole portion 248a.

第３穴部２４８ｃは、径方向のうちの左右方向Ｙに延びる。第３穴部２４８ｃは、第２層部２４２における前後方向Ｘの中心に配置される。第３穴部２４８ｃは、左右方向Ｙに沿って視て中心軸Ｊと重なる。第３穴部２４８ｃは、貫通孔２４９を左右方向Ｙに挟んで２つ設けられる。第３穴部２４８ｃの径方向内側の端部は、貫通孔２４９から径方向外側に離れて配置される。第３穴部２４８ｃの左右方向Ｙに直交する断面形状は、円形状である。第３穴部２４８ｃの中心における上下方向Ｚの位置は、第３穴部２４８ｂの中心における上下方向Ｚの位置と同じである。 The third hole portion 248c extends in the left-right direction Y in the radial direction. The third hole portion 248c is arranged at the center of the second layer portion 242 in the front-rear direction X. The third hole portion 248c overlaps with the central axis J when viewed along the left-right direction Y. Two third hole portions 248c are provided with the through hole 249 sandwiched in the left-right direction Y. The radial inner end of the third hole 248c is arranged radially outward from the through hole 249. The cross-sectional shape of the third hole portion 248c orthogonal to the left-right direction Y is a circular shape. The position of the vertical direction Z at the center of the third hole portion 248c is the same as the position of the vertical direction Z at the center of the third hole portion 248b.

図１０に示すように、第３穴部２４８ａ，２４８ｂ，２４８ｃの一部は、空洞部２４４ａ，２４４ｂ，２４４ｃと上下方向Ｚに重なる位置に配置される。そのため、空洞部２４４ａ，２４４ｂ，２４４ｃ内の空気を第２層部２４２から第３穴部２４８ａ，２４８ｂ，２４８ｃに流入しやすくできる。これにより、空洞部２４４ａ，２４４ｂ，２４４ｃ内の排気をより行いやすい。本実施形態では、第３穴部２４８ａ，２４８ｂ，２４８ｃの一部は、成形空洞部２４４ｄ，２４４ｆの上側に配置される。 As shown in FIG. 10, a part of the third hole portions 248a, 248b, 248c is arranged at a position overlapping the cavity portions 244a, 244b, 244c in the vertical direction Z. Therefore, the air in the cavities 244a, 244b, 244c can be easily flowed from the second layer portion 242 into the third hole portions 248a, 248b, 248c. This makes it easier to exhaust the inside of the cavities 244a, 244b, and 244c. In the present embodiment, a part of the third hole portions 248a, 248b, and 248c is arranged above the molded cavity portions 244d and 244f.

上述した各実施形態においては、穴部は多孔質部である第２層部に設けられる部分を有したが、これに限られない。穴部は、多孔質部に繋がればよく、例えば、多孔質部の表面に開口する構成でもよい。具体的には、例えば第１実施形態の成形部４０において、穴部が第１層部４１のみに配置され、穴部が第２層部４２の下側の面に開口してもよい。また、各層部は、互いに別部材であってもよい。また、上述した各実施形態において、穴部は設けられなくてもよい。 In each of the above-described embodiments, the hole portion has a portion provided in the second layer portion which is a porous portion, but the present invention is not limited to this. The hole portion may be connected to the porous portion, and may be configured to open on the surface of the porous portion, for example. Specifically, for example, in the molded portion 40 of the first embodiment, the hole portion may be arranged only in the first layer portion 41, and the hole portion may be opened on the lower surface of the second layer portion 42. Further, each layer portion may be a separate member from each other. Further, in each of the above-described embodiments, the hole portion may not be provided.

また、上述した各実施形態の樹脂成形金型によって成形される樹脂成形品は、特に限定されない。上述した各実施形態の成形部で成形される樹脂成形品の部分の形状は、特に限定されない。また、樹脂成形金型は、１つの成形部のみで構成されてもよい。また、上記の各構成は、相互に矛盾しない範囲内において、適宜組み合わせることができる。 Further, the resin molded product molded by the resin molding mold of each of the above-described embodiments is not particularly limited. The shape of the portion of the resin molded product molded by the molding portion of each of the above-described embodiments is not particularly limited. Further, the resin molding die may be composed of only one molding portion. In addition, the above configurations can be appropriately combined within a range that does not contradict each other.

１…樹脂成形金型、４０，２４０…成形部、４１，２４１…第１層部、４２，２４２…第２層部、４３，２４３…第３層部、４４，２４４，２４４ａ，２４４ｂ，２４４ｃ…空洞部、４５…第１穴部、４６，４６ａ，４６ｂ，４６ｃ…第２穴部、４７，２４７…穴部、２４８，２４８ａ，２４８ｂ，２４８ｃ…第３穴部、Ｚ…上下方向 1 ... Resin molding mold, 40, 240 ... Molding part 41,241 ... First layer part, 42,242 ... Second layer part, 43,243 ... Third layer part, 44,244,244a, 244b, 244c ... Cavity, 45 ... 1st hole, 46, 46a, 46b, 46c ... 2nd hole, 47, 247 ... Hole, 248, 248a, 248b, 248c ... 3rd hole, Z ... Vertical direction

Claims (7)

上下方向に積層される複数の層部を有する成形部を備え、
前記複数の層部は、
第１層部と、
前記第１層部の上側に積層される第２層部と、
前記第２層部の上側に積層される第３層部と、
を含み、
前記成形部は、樹脂材料が流し込まれる空洞部を有し、
前記空洞部は、上下方向に延び、前記第１層部と前記第２層部と前記第３層部とに跨って配置され、
前記第２層部の気体の透過率は、前記第１層部の前記透過率および前記第３層部の前記透過率と異なり、
前記第２層部の前記透過率は、前記第１層部の前記透過率および前記第３層部の前記透過率よりも大きく
前記成形部は、前記第２層部と前記成形部の外部とを繋ぐ穴部を有し、
前記穴部は、前記成形部の上側の面と前記成形部の下側の面とのうちの少なくとも一方に開口する第１穴部を有し、
前記第１穴部は、前記第２層部と繋がる樹脂成形金型。 A molded portion having a plurality of layered portions stacked in the vertical direction is provided.
The plurality of layers are
The first layer and
The second layer portion laminated on the upper side of the first layer portion and
A third layer portion laminated on the upper side of the second layer portion and
Including
The molded portion has a hollow portion into which the resin material is poured.
The cavity portion extends in the vertical direction and is arranged so as to straddle the first layer portion, the second layer portion, and the third layer portion.
The transmittance of the gas in the second layer portion is different from the transmittance in the first layer portion and the transmittance in the third layer portion .
The transmittance of the second layer portion is larger than the transmittance of the first layer portion and the transmittance of the third layer portion.
The molded portion has a hole portion that connects the second layer portion and the outside of the molded portion.
The hole portion has a first hole portion that opens in at least one of an upper surface of the molded portion and a lower surface of the molded portion.
The first hole portion is a resin molding mold connected to the second layer portion. 前記空洞部の前記第１層部に配置される部分における上下方向の寸法は、前記空洞部の前記第３層部に配置される部分における上下方向の寸法よりも大きい、請求項１に記載の樹脂成形金型。The first aspect of the present invention, wherein the vertical dimension of the portion of the hollow portion arranged in the first layer portion is larger than the vertical dimension of the portion of the hollow portion arranged in the third layer portion. Resin molding mold. 前記穴部は、前記第１穴部と繋がる第２穴部を有し、The hole portion has a second hole portion connected to the first hole portion.
前記第２穴部は、前記第２層部に配置され、前記空洞部の径方向外側を囲む環状である、請求項１に記載の樹脂成形金型。 The resin molding die according to claim 1, wherein the second hole portion is arranged in the second layer portion and is an annular shape surrounding the radial outer side of the cavity portion. 前記穴部は、前記第２層部と繋がる第３穴部を有し、The hole portion has a third hole portion connected to the second layer portion.
前記第３穴部は、前記成形部の上下方向と直交する方向の側面に開口する、請求項１から３のいずれか一項に記載の樹脂成形金型。 The resin molding die according to any one of claims 1 to 3, wherein the third hole portion opens on a side surface in a direction orthogonal to the vertical direction of the molding portion. 前記層部の少なくとも一つは、多孔性を有する、請求項１から４のいずれか一項に記載の樹脂成形金型。The resin molding die according to any one of claims 1 to 4, wherein at least one of the layer portions has porosity. 前記成形部は、単一の部材である、請求項１から５のいずれか一項に記載の樹脂成形金型。The resin molding die according to any one of claims 1 to 5, wherein the molding portion is a single member. 前記空洞部の上下方向と直交する方向の寸法は、上下方向に沿って一様である、請求項１から６のいずれか一項に記載の樹脂成形金型。The resin molding die according to any one of claims 1 to 6, wherein the dimensions of the cavity in the direction orthogonal to the vertical direction are uniform along the vertical direction.
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