JP2012218189A - Method for molding resin-made fuel tank - Google Patents
Method for molding resin-made fuel tank Download PDFInfo
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- JP2012218189A JP2012218189A JP2011083215A JP2011083215A JP2012218189A JP 2012218189 A JP2012218189 A JP 2012218189A JP 2011083215 A JP2011083215 A JP 2011083215A JP 2011083215 A JP2011083215 A JP 2011083215A JP 2012218189 A JP2012218189 A JP 2012218189A
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Abstract
Description
本発明は、樹脂製燃料タンクを成形するための成形方法に関する。 The present invention relates to a molding method for molding a resin fuel tank.
自動車等の車両に備えられる燃料タンクでは、樹脂で構成されると共に、燃料タンクの容積を可変としたものがある。たとえば特許文献１には、蛇腹状の可変容量部を設けた液体タンクが記載されている。特許文献１には、合成樹脂を材料として、ブロー成形法等により成形する点も記載されている。 Some fuel tanks provided in vehicles such as automobiles are made of resin and the volume of the fuel tank is variable. For example, Patent Document 1 describes a liquid tank provided with a bellows-like variable capacity portion. Patent Document 1 also describes that a synthetic resin is used as a material for molding by a blow molding method or the like.
ところで、燃料タンクの容積を容易に可変させるためには、変形部分が他の部分と比較して薄肉化されていることが望ましい。しかし、ブロー成形等によって燃料タンクの全体形状を成形すると、燃料タンクの外殻部分の一部を薄肉化することが難しい。 By the way, in order to easily change the volume of the fuel tank, it is desirable that the deformed portion is thinner than the other portions. However, when the entire shape of the fuel tank is formed by blow molding or the like, it is difficult to reduce a part of the outer shell portion of the fuel tank.
本発明は上記事実を考慮し、外殻部分の一部を他の部分と比較して薄肉化することが可能な樹脂製燃料タンクの成形方法を得ることを課題とする。 In view of the above facts, an object of the present invention is to obtain a method for molding a resin fuel tank that can make a part of an outer shell part thinner than other parts.
請求項１に記載の発明では、成形前の樹脂材料がセットされる成形部を備えブロー成形によって成形部内で燃料タンクの外殻形状を成形する金型本体と、該成形部の内側に位置する成形面に外側へ凹む凹部を備え成形部に対して進退可能とされると共に成形部の一部を取り囲むように配置された可動型を用い、前記可動型を前記成形部から後退させた状態で該成形部の内面及び前記成形面に前記樹脂材料を密着させて前記凹部において樹脂材料を成形部の内面に密着した部分よりも薄肉化する第１薄肉化工程と、次いで前記可動型を前記成形部に前進させることで前記凹部以外の前記成形面に密着した樹脂材料を成形部の内面に密着した部分よりも薄肉化する第２薄肉化工程と、を有する。 In the first aspect of the present invention, a mold main body that includes a molding portion in which a resin material before molding is set is provided, and that molds the outer shell shape of the fuel tank in the molding portion by blow molding, and is located inside the molding portion. Using a movable mold that has a concave portion recessed outward on the molding surface and can be moved back and forth with respect to the molding portion and is arranged so as to surround a part of the molding portion, with the movable die retracted from the molding portion. A first thinning step in which the resin material is brought into close contact with the inner surface of the molding part and the molding surface to make the resin material thinner in the concave portion than the part of the molding part in close contact with the inner surface of the molding part; A second thinning step of thinning the resin material that is in close contact with the molding surface other than the concave portion than the portion that is in close contact with the inner surface of the molding portion.
この樹脂製燃料タンクの成形方法では、可動型を成形部から後退させた状態で、第１薄肉化工程を行う。すなわち、成形部の内面及び可動型の成形面に樹脂材料を密着させる。可動型の成形面には外側へ凹む凹部が形成されているので、この凹部に樹脂材料が入り込むときに凹部内で薄肉化される。 In this method of molding a resin fuel tank, the first thinning step is performed with the movable mold retracted from the molding portion. That is, the resin material is brought into close contact with the inner surface of the molding part and the molding surface of the movable mold. Since the concave portion that is recessed outward is formed on the movable molding surface, the resin material is thinned in the concave portion when the resin material enters the concave portion.
次いで、第２薄肉化工程を行い、可動型を成形部に前進させる。これにより、可動型において凹部以外の成形面に密着した樹脂材料が、成形部内に引き伸ばされて薄肉化される。 Next, a second thinning step is performed, and the movable mold is advanced to the molding part. As a result, the resin material that is in close contact with the molding surface other than the concave portion in the movable mold is stretched into the molding portion and thinned.
このように、本発明の樹脂製燃料タンクの成形方法では、タンクの外殻形状に対し、一部分を確実に薄肉化できる。 Thus, in the method for molding a resin fuel tank according to the present invention, a portion of the outer shell shape of the tank can be reliably thinned.
可動型は、金型本体の成形部の一部を取り囲むように配置されているので、成形された樹脂製燃料タンクにも、外殻形状の一部を取り囲む薄肉部が形成される。この薄肉部を変形させることで、薄肉部分の内側部分を外側部分に対し変位させて、燃料タンクの容積を変化させることができる。 Since the movable mold is arranged so as to surround a part of the molding part of the mold body, a thin part surrounding the part of the outer shell shape is also formed in the molded resin fuel tank. By deforming the thin portion, the inner portion of the thin portion can be displaced with respect to the outer portion, and the volume of the fuel tank can be changed.
請求項２に記載の発明では、請求項１に記載の発明において、前記成形部が、平坦状に形成された少なくとも１つの平坦面を備え、前記可動型が、前記１つの平坦面において前記成形部の一部を取り囲んでいる。 According to a second aspect of the present invention, in the first aspect of the present invention, the molding part includes at least one flat surface formed in a flat shape, and the movable mold is formed on the one flat surface. Encloses part of the department.
１つの平坦面において、可動型が成形部の一部を取り囲んでいるので、複数の平坦面に連続して可動型が成形部の一部を取り囲む構造と比較して、可動型の形状や可動型を進退させる構造が簡単になり、樹脂製燃料タンクの成形も容易になる。 Since the movable mold surrounds a part of the molded part on one flat surface, the movable mold can be shaped and moved as compared with the structure in which the movable mold continuously surrounds a part of the molded part on a plurality of flat surfaces. The structure for advancing and retracting the mold is simplified, and molding of the resin fuel tank is facilitated.
請求項３に記載の発明では、請求項２に記載の発明において、前記１つの平坦面では１つの前記可動型が前記成形部の一部を取り囲んでいる。 According to a third aspect of the present invention, in the second aspect of the present invention, one movable mold surrounds a part of the molding portion on the one flat surface.
すなわち、１つの平坦面に対応して１つの可動型が配置されているので、１つの平坦面に対応して複数の可動型を配置した構成と比較して、可動型の形状や可動型を進退させる構造がさらに簡単になり、樹脂製燃料タンクの成形もさらに容易になる。 That is, since one movable mold is arranged corresponding to one flat surface, the shape of the movable mold and the movable mold are compared with the configuration in which a plurality of movable molds are arranged corresponding to one flat surface. The advancing / retreating structure is further simplified, and the molding of the resin fuel tank is further facilitated.
本発明は上記構成としたので、外殻部分の一部を他の部分と比較して薄肉化することが可能な樹脂製燃料タンクの成形方法が得られる。 Since the present invention has the above-described configuration, a method for molding a resin fuel tank that can make a part of the outer shell part thinner than the other part is obtained.
図１には、本発明の第１実施形態の樹脂製燃料タンクの成形方法（以下、単に「成形方法」とする）によって成形される燃料タンク１２の形状の一例が、上下方向の断面図にて示されている。 FIG. 1 shows an example of the shape of a fuel tank 12 formed by the resin fuel tank molding method (hereinafter simply referred to as “molding method”) according to the first embodiment of the present invention in a vertical sectional view. Is shown.
この燃料タンク１２は、内部に燃料を収容することが可能な燃料タンク１２を有している。燃料タンク１２の形状は特に限定されないが、本実施形態の燃料タンク１２は、直方体の略箱状に形成された燃料タンク本体１４を備えている。 The fuel tank 12 has a fuel tank 12 capable of containing fuel therein. Although the shape of the fuel tank 12 is not particularly limited, the fuel tank 12 of the present embodiment includes a fuel tank body 14 formed in a substantially rectangular parallelepiped box shape.
燃料タンク本体１４は、熱可塑性樹脂（たとえばＰＥ）で構成された上タンク構成部材１４Ｕと下タンク構成部材１４Ｌとを有している。これらのタンク構成部材の周囲が接合されることで、略箱状の燃料タンク本体１４が構成されている。 The fuel tank main body 14 has an upper tank constituent member 14U and a lower tank constituent member 14L made of thermoplastic resin (for example, PE). A substantially box-shaped fuel tank body 14 is configured by joining the periphery of these tank constituent members.
燃料タンク１２の上壁１４Ｔには、上方から見て閉曲線状（たとえば円形あるいは四角形）の薄肉部１６が形成されている。薄肉部１６は、上壁１４Ｔを構成している周囲の部分（板状の部分）よりも薄肉で、且つ上下方向に波打つ蛇腹状とされており、変形しやすくなっている。特に本実施形態の薄肉部１６は、図１における横方向に見て中央に位置する薄肉山部１６Ｍと、この薄肉山部１６Ｍの両側に位置する薄肉谷部１６Ｖとで構成されている。 On the upper wall 14T of the fuel tank 12, a thin-walled portion 16 having a closed curve shape (for example, a circle or a quadrangle) as viewed from above is formed. The thin portion 16 is thinner than the surrounding portion (plate-like portion) constituting the upper wall 14T and has a bellows shape that undulates in the vertical direction, and is easily deformed. In particular, the thin portion 16 of the present embodiment is composed of a thin peak portion 16M located in the center when viewed in the lateral direction in FIG. 1 and thin valley portions 16V located on both sides of the thin peak portion 16M.
薄肉部１６の内側部分は、薄肉部１６の変形により下方に変位する容積可変部１８となっている。すなわち、容積可変部１８が下方に変位することで、燃料タンク１２の容積が減少する。逆に、容積可変部１８が上方に変位すると、燃料タンク１２の容積が増大する。 The inner portion of the thin portion 16 is a variable volume portion 18 that is displaced downward by deformation of the thin portion 16. That is, the volume of the fuel tank 12 is reduced by the displacement of the volume variable unit 18 downward. Conversely, when the volume variable unit 18 is displaced upward, the volume of the fuel tank 12 increases.
容積可変部１８（特に本実施形態では、燃料タンク１２を上方から平面視したときの容積可変部１８の略中央）には、下方へと凸状に延出された変形制限凸部２０が形成されている。これに対し、燃料タンク１２の下壁１４Ｂにも、変形制限凸部２０と対向する位置で上方へと凸状に延出された変形制限台部２２が形成されている。変形制限台部２２は、変形制限凸部２０と上下方向に対向しており、容積可変部１８の下方への変形量を、変形制限凸部２０と変形制限台部２２が接触することで所定範囲に制限している。燃料タンク本体１４の上壁１４Ｔには、このような変形制限凸部２０が形成されているが、全体的には平坦状であり、本発明に係る「平坦面」になっている。 In the variable volume portion 18 (particularly, in the present embodiment, the deformation variable convex portion 20 that protrudes downward is formed at the approximate center of the variable volume portion 18 when the fuel tank 12 is viewed from above. Has been. On the other hand, the deformation limiting base part 22 extended in a convex shape at the position facing the deformation limiting convex part 20 is also formed on the lower wall 14B of the fuel tank 12. The deformation limiting base part 22 faces the deformation limiting convex part 20 in the vertical direction, and the deformation amount downward of the volume variable part 18 is determined by the deformation limiting convex part 20 and the deformation limiting base part 22 contacting each other. Limited to range. The upper wall 14T of the fuel tank main body 14 is formed with such a deformation limiting convex portion 20, but is generally flat and has a “flat surface” according to the present invention.
図２〜図４には、上記した燃料タンク１２を成形する方法（本発明の樹脂製燃料タンクの成形方法）が、工程順に示されている。 2 to 4 show a method of molding the above-described fuel tank 12 (a method for molding a resin fuel tank of the present invention) in the order of steps.
この成形方法は、金型３２を用いていわゆるブロー成形により燃料タンク本体１４を成形する方法であり、金型は３２、上型３４Ｕと下型３４Ｌとを有する金型本体３４と、上型３４Ｕに設けられた可動型３６とを有している。上型３４Ｕ及び下型３４Ｌには、燃料タンク１２の外殻形状を形成するための成形部３８が形成されている。成形部３８の周囲は、上型３４Ｕと下型３４Ｌとでパリソン６０の樹脂材料を型締めする型締め部４０とされている。 This molding method is a method of molding the fuel tank body 14 by so-called blow molding using a mold 32. The mold is 32, a mold body 34 having an upper mold 34U and a lower mold 34L, and an upper mold 34U. And a movable die 36. Formed portions 38 for forming the outer shell shape of the fuel tank 12 are formed in the upper die 34U and the lower die 34L. The periphery of the molding part 38 is a mold clamping part 40 that clamps the resin material of the parison 60 with the upper mold 34U and the lower mold 34L.
また、上型３４Ｕの中央には、変形制限凸部２０を形成するための上凸部４２が設けられ、下型３４Ｌの中央には、変形制限台部２２を形成するための下凸部４４が設けられている。 An upper convex portion 42 for forming the deformation limiting convex portion 20 is provided at the center of the upper die 34U, and a lower convex portion 44 for forming the deformation limiting base portion 22 at the center of the lower die 34L. Is provided.
上型３４Ｕには、可動型３６が設けられている。可動型３６は、薄肉部１６を形成するために、上方から（矢印Ａ１方向に）見て薄肉部１６に対応した形状（環状）とされている。特に、可動型３６の先端は、薄肉部１６を形成するための成形面３６Ａとされている。成形面３６Ａの幅方向中央には、成形部３８から見て外側（図２（Ａ）及び（Ｂ）の例では上側）に凹む凹部３６Ｂが形成されている。 A movable mold 36 is provided in the upper mold 34U. The movable mold 36 has a shape (annular shape) corresponding to the thin portion 16 when viewed from above (in the direction of arrow A1) in order to form the thin portion 16. In particular, the tip of the movable mold 36 is a molding surface 36A for forming the thin portion 16. At the center in the width direction of the molding surface 36A, a recess 36B is formed that is recessed outward (upward in the example of FIGS. 2A and 2B) when viewed from the molding part 38.
そして、図示しない進退機構により上下に移動し、成形面３６Ａが成形部３８内に突出する前進位置ＦＳ（図４（Ｂ）参照）と、成形部３８から後退する後退位置ＢＳ（図２（Ｂ）及び図３（Ｂ）参照）との間を移動するようになっている。 Then, it moves up and down by an advancing / retracting mechanism (not shown), and a forward position FS (see FIG. 4B) where the molding surface 36A protrudes into the molding part 38 and a backward position BS (see FIG. ) And FIG. 3 (B)).
燃料タンク１２の燃料タンク１２を成形する場合、まず、可動型３６を上方に移動させ、後退位置ＢＳに位置させておく。 When the fuel tank 12 of the fuel tank 12 is molded, first, the movable mold 36 is moved upward and is positioned at the retreat position BS.
この状態で、略筒状に形成されたパリソン６０を、成形部３８内にセットし、図２（Ａ）に示すように、上型３４Ｕと下型３４Ｌとを接近させて、いわゆる型締めを行う。型締めにより、パリソン６０を構成している樹脂材料が、部分的に上型３４Ｕと下型３４Ｌとの間に挟みこまれて保持される。なお、略円筒状のパリソン６０に代えて、たとえば上下２枚の樹脂製シートを成形部３８にセットしてもよい。 In this state, the parison 60 formed in a substantially cylindrical shape is set in the molding portion 38, and as shown in FIG. 2 (A), the upper die 34U and the lower die 34L are brought close to each other to perform so-called clamping. Do. By the mold clamping, the resin material constituting the parison 60 is partially sandwiched and held between the upper mold 34U and the lower mold 34L. Instead of the substantially cylindrical parison 60, for example, two upper and lower resin sheets may be set in the molding portion 38.
そして、成形部３８内（パリソン６０の内部）に圧縮空気を吹き込み、パリソン６０に内圧を作用させる。図２（Ｂ）にも示すように、パリソン６０は膨張して成形部３８の内面及び成形面３６Ａに密着する。 Then, compressed air is blown into the molding portion 38 (inside the parison 60), and an internal pressure is applied to the parison 60. As shown in FIG. 2B, the parison 60 expands and closely contacts the inner surface of the molding portion 38 and the molding surface 36A.
なお、パリソン６０が成形部３８の内面に密着したことは、たとえば、圧縮空気を送り込んだ時間や、空気圧等から知ることが可能である。 The fact that the parison 60 is in close contact with the inner surface of the molding portion 38 can be known from, for example, the time when compressed air is fed, the air pressure, or the like.
ここで、さらに圧縮空気を吹き込むと、パリソン６０の一部は、図３（Ａ）及び（Ｂ）にも示すように、可動型３６の凹部３６Ｂにも入り込む。凹部３６Ｂでは、パリソン６０の密着部分の周長が長くなっているが、パリソン６０の他の部分は成形部３８の内面及び成形面３６Ａに密着しているため、型締め部４０と上凸部４２との間では、凹部３６Ｂ内に入り込んだパリソン６０の樹脂材料のみが伸ばされ、成形部３８の内面に密着した部分よりも薄くなる（第１薄肉化工程）。薄くなった部分は、最終的には薄肉山部１６Ｍとなる部分である。 Here, when compressed air is further blown, a part of the parison 60 also enters the recess 36B of the movable die 36 as shown in FIGS. 3 (A) and 3 (B). In the recess 36B, the peripheral length of the close contact portion of the parison 60 is long, but the other portions of the parison 60 are in close contact with the inner surface of the molding portion 38 and the molding surface 36A. Between 42, only the resin material of the parison 60 that has entered the recess 36B is stretched and becomes thinner than the portion that is in close contact with the inner surface of the molded portion 38 (first thinning step). The thinned portion is the portion that eventually becomes the thin-walled ridge 16M.
次に、図４（Ａ）及び（Ｂ）に示すように、可動型３６を前進位置ＦＳ（下方）へ移動させて成形部３８内に突出させる。このときも、成形面３６Ａではパリソン６０の密着部分の周長が長くなるが、パリソン６０は、可動型３６に密着している部分以外は成形部３８の内面に密着しているので、成形面３６Ａに密着したパリソン６０の樹脂材料が引き伸ばされ、成形部３８の内面に密着した部分よりも薄くなる（第２薄肉化工程）。薄くなった部分は、最終的には薄肉谷部１６Ｖとなる。 Next, as shown in FIGS. 4A and 4B, the movable die 36 is moved to the forward movement position FS (downward) to project into the molding portion 38. Also at this time, the circumferential length of the close contact portion of the parison 60 becomes longer on the molding surface 36A. However, since the parison 60 is in close contact with the inner surface of the molding portion 38 except for the portion in close contact with the movable die 36, the molding surface. The resin material of the parison 60 that is in close contact with 36A is stretched and becomes thinner than the portion that is in close contact with the inner surface of the molded portion 38 (second thinning step). The thinned portion finally becomes a thin valley portion 16V.
このように、本実施形態の成形方法では、まず、可動型３６を後退させた状態で、パリソン６０の内部に圧縮空気を送るので、図２（Ｂ）から分かるように、型締め部４０と上凸部４２との間でパリソン６０を構成する樹脂が伸ばされ、薄肉部１６を構成する部分の樹脂の厚みを薄くすることができる。 As described above, in the molding method of the present embodiment, first, the compressed air is sent into the parison 60 with the movable mold 36 retracted, and therefore, as can be seen from FIG. The resin constituting the parison 60 is stretched between the upper convex portion 42 and the thickness of the resin constituting the thin portion 16 can be reduced.
しかも、この状態でさらに圧縮空気を送ると、凹部３６Ｂ（周長が長くなった部分）に樹脂が入りこむので、図３（Ｂ）から分かるように、この凹部３６Ｂでは樹脂がさらに引き伸ばされ、薄肉山部１６Ｍを構成する部分の樹脂の厚みをさらに薄くすることができる。 In addition, when compressed air is further sent in this state, the resin enters the recess 36B (the portion with the longer circumferential length), and as can be seen from FIG. 3B, the resin is further stretched in the recess 36B, and the thin wall The thickness of the resin constituting the peak portion 16M can be further reduced.
また、図４（Ｂ）から分かるように、可動型３６を前進させると、成形面３６Ａによって樹脂がさらに引き伸ばされるため、薄肉谷部１６Ｖを構成する部分の樹脂の厚みをさらに薄くすることができる。 Further, as can be seen from FIG. 4B, when the movable die 36 is advanced, the resin is further stretched by the molding surface 36A, so that the thickness of the resin constituting the thin valley portion 16V can be further reduced. .
以上により、薄肉部１６が、他の部分と比較して確実に薄くなった燃料タンク本体１４が得られる。薄肉部１６は変形しやすいので、容積可変部１８も変位しやすくなり、燃料タンク１２の容積を容易に変化させることが可能となる。 As described above, the fuel tank body 14 in which the thin portion 16 is surely thinner than the other portions is obtained. Since the thin portion 16 is easily deformed, the volume variable portion 18 is also easily displaced, and the volume of the fuel tank 12 can be easily changed.
なお、上記では、環状の薄肉部１６が上壁１４Ｔに１つのみ形成された燃料タンク１２を挙げているが、たとえば、薄肉部１６が燃料タンク本体１４の１つの壁部に複数形成されていてもよいし、複数の壁部に薄肉部１６が形成されていてもよい。 In the above description, the fuel tank 12 in which only one annular thin portion 16 is formed on the upper wall 14T is described. For example, a plurality of thin portions 16 are formed on one wall portion of the fuel tank main body 14. Or the thin part 16 may be formed in the some wall part.
さらには、図５に示す変形例の燃料タンク８２のように、薄肉部１６が燃料タンク１２の上壁１４Ｔから図５奥側の側壁１４Ｓ、下壁１４Ｂ、手前側の側壁１４Ｕを経て上壁１４Ｔまで１周する形状の薄肉部８６を１又は複数（図５の例では２つ）形成してもよい。ただし、図５に示した変形例の燃料タンク８２では、燃料タンク本体１４の４つの壁面に薄肉部８６が形成されているので、可動型をそれぞれの薄肉部に対応させて４つ設ける必要がある。また、可動型を可動させるための構成等も複雑になる。 Further, as in the fuel tank 82 of the modified example shown in FIG. 5, the thin wall portion 16 passes from the upper wall 14T of the fuel tank 12 through the side wall 14S, the lower wall 14B, and the side wall 14U on the near side in FIG. One or a plurality (two in the example of FIG. 5) of thin portions 86 having a shape that goes around once up to 14T may be formed. However, in the fuel tank 82 of the modified example shown in FIG. 5, the thin wall portions 86 are formed on the four wall surfaces of the fuel tank main body 14, so it is necessary to provide four movable molds corresponding to the thin wall portions. is there. Further, the configuration for moving the movable mold becomes complicated.
これに対し、図１に示した構造の燃料タンク１２では、燃料タンク１２の１つの壁部（上壁１４Ｔ）のみに薄肉部１６を形成しているので、これに対応した可動型３６も１つで済み、可動型３６の移動方向も、成形部３８から後退する方向のみとなるので、金型３２の構造が簡単になる。 On the other hand, in the fuel tank 12 having the structure shown in FIG. 1, since the thin portion 16 is formed only on one wall portion (upper wall 14T) of the fuel tank 12, the movable mold 36 corresponding to this is also one. Thus, the moving direction of the movable die 36 is only the direction of retreating from the molding portion 38, so that the structure of the mold 32 is simplified.
なお、燃料タンク１２の１つの壁部に複数の薄肉部を形成してもよく、この場合には、複数の薄肉部のそれぞれに対応した可動型が必要になる。この場合には、すべての可動型の移動方向を同じにすれば、燃料タンク１２の成形は容易になる。薄肉部１６を形成する部位は、下壁１４Ｂや側壁１４Ｓ、１４Ｕであってもよい。 In addition, you may form a some thin part in one wall part of the fuel tank 12, In this case, the movable type corresponding to each of a some thin part is needed. In this case, if the moving directions of all the movable molds are the same, the fuel tank 12 can be easily formed. The site | part which forms the thin part 16 may be the lower wall 14B and the side walls 14S and 14U.
また、１つの薄肉部１６を形成する場合に、可動型３６を分割型としてもよいが、単一の型とすれば金型の構造を簡素化でき、好ましい。 Moreover, when forming the one thin part 16, although the movable mold | type 36 is good also as a division | segmentation type | mold, if a single type | mold is used, the structure of a metal mold | die can be simplified and it is preferable.
１２ 燃料タンク
１４ 燃料タンク本体
１６ 薄肉部
１８ 容積可変部
３２ 金型
３４ 金型本体
３６ 可動型
３６Ａ 成形面
３６Ｂ 凹部
３８ 成形部
４０ 型締め部
６０ パリソン
８２ 燃料タンク
８６ 薄肉部
DESCRIPTION OF SYMBOLS 12 Fuel tank 14 Fuel tank main body 16 Thin part 18 Volume variable part 32 Mold 34 Mold main body 36 Movable type | mold 36A Molding surface 36B Recessed part 38 Molding part 40 Clamping part 60 Parison 82 Fuel tank 86 Thin part
Claims (3)
前記可動型を前記成形部から後退させた状態で該成形部の内面及び前記成形面に前記樹脂材料を密着させて前記凹部において樹脂材料を成形部の内面に密着した部分よりも薄肉化する第１薄肉化工程と、
次いで前記可動型を前記成形部に前進させることで前記凹部以外の前記成形面に密着した樹脂材料を成形部の内面に密着した部分よりも薄肉化する第２薄肉化工程と、
を有する樹脂製燃料タンクの成形方法。 A mold body for forming the outer shell shape of the fuel tank in the molding part by blow molding and having a molding part in which the resin material before molding is set, and a concave part recessed outwardly on the molding surface located inside the molding part Using a movable mold that can move forward and backward with respect to the molded part and is arranged so as to surround a part of the molded part,
In a state where the movable mold is retracted from the molding part, the resin material is brought into close contact with the inner surface of the molding part and the molding surface, and the resin material is made thinner in the concave portion than the part in close contact with the inner surface of the molding part. 1 thinning process,
Next, a second thinning step of making the resin material in close contact with the molding surface other than the concave portion thinner than the portion in close contact with the inner surface of the molding portion by advancing the movable mold to the molding portion;
A method for forming a resin fuel tank having
前記可動型が、前記１つの平坦面において前記成形部の一部を取り囲んでいる請求項１に記載の樹脂製燃料タンクの成形方法。 The molded part includes at least one flat surface formed in a flat shape,
The method for molding a resin fuel tank according to claim 1, wherein the movable mold surrounds a part of the molding portion on the one flat surface.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05293879A (en) * | 1992-04-22 | 1993-11-09 | Mazda Motor Corp | Blow molding method |
| JPH06143396A (en) * | 1991-04-11 | 1994-05-24 | Isuzu Motors Ltd | Apparatus for manufacturing resin-made fuel tank |
| JPH11198222A (en) * | 1998-01-16 | 1999-07-27 | Nissan Motor Co Ltd | Method and apparatus for molding hollow container |
| JP2006193127A (en) * | 2005-01-17 | 2006-07-27 | Honda Motor Co Ltd | Fuel tank |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06143396A (en) * | 1991-04-11 | 1994-05-24 | Isuzu Motors Ltd | Apparatus for manufacturing resin-made fuel tank |
| JPH05293879A (en) * | 1992-04-22 | 1993-11-09 | Mazda Motor Corp | Blow molding method |
| JPH11198222A (en) * | 1998-01-16 | 1999-07-27 | Nissan Motor Co Ltd | Method and apparatus for molding hollow container |
| JP2006193127A (en) * | 2005-01-17 | 2006-07-27 | Honda Motor Co Ltd | Fuel tank |
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