JP2537691B2 - Matt Guard Manufacturing Method - Google Patents
Matt Guard Manufacturing MethodInfo
- Publication number
- JP2537691B2 JP2537691B2 JP2071355A JP7135590A JP2537691B2 JP 2537691 B2 JP2537691 B2 JP 2537691B2 JP 2071355 A JP2071355 A JP 2071355A JP 7135590 A JP7135590 A JP 7135590A JP 2537691 B2 JP2537691 B2 JP 2537691B2
- Authority
- JP
- Japan
- Prior art keywords
- skin layer
- layer material
- mudguard
- mold
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は，上記表皮面の厚みが薄いサンドイッチ構造
のマッドガードを成形する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for forming a mudguard having a sandwich structure having a thin skin surface.
合成樹脂のサンドイッチ成形方法としては，例えば特
公昭52−11336号公報に示される技術がある。A synthetic resin sandwich molding method is disclosed in, for example, Japanese Patent Publication No. 52-11336.
上記公報掲載の技術は，射出ノズルにより成形型のキ
ャビティ内に，まず非多泡状の表皮材料を射出し，更に
推進剤（発泡剤）で多泡状になる内核材料を射出して，
非多泡状の表皮層材料と多泡状の内核材料とからなる合
成樹脂製のサンドイッチ成形品を製造する方法である。In the technology disclosed in the above publication, first, a non-foamed skin material is injected into a cavity of a molding die by an injection nozzle, and then a propellant (foaming agent) is used to inject a foamed inner core material,
It is a method for producing a synthetic resin sandwich molded article composed of a non-foamed skin layer material and a foamed inner core material.
この方法を利用すれば，内部に硬いコア層を有し，そ
の表面に軟らかい表皮層を被覆したサンドイッチ成形品
を製造することができる。By using this method, it is possible to manufacture a sandwich molded article having a hard core layer inside and coating a soft skin layer on the surface thereof.
ところで，マッドガードにおいては，その一部分は表
皮層を厚くして柔軟性を付与し，他部分は表皮層を薄く
することによってコア層を厚くして剛性を付与すること
が望まれる。By the way, in the mudguard, it is desired that one part of the mudguard has a thicker skin layer to give flexibility, and the other part has a thinner skin layer to thicken the core layer to give rigidity.
即ち，例えば，第７図及び第８図に示すごとく，特開
平１−233178号公報に示される，自動車用マッドガード
４は，車体に取付ける本体41及び取付部43と，これらの
下方に垂設した下片42とよりなる。That is, for example, as shown in FIGS. 7 and 8, the mudguard 4 for an automobile disclosed in JP-A-1-233178 has a main body 41 and an attachment portion 43 to be attached to a vehicle body, and is hung vertically below them. It consists of the lower piece 42.
上記本体41は，ボルト挿入用の取付孔411,412を，ま
た取付部43は同様の取付孔431を有する。また，上記本
体41と取付部43との間には，両者で囲まれた凹所45を有
する。該凹所45は，車体の一部を挿入する部分である。
また，上記マッドガード４の断面構造は，第８図に示す
ごとく，下方42の厚さを薄くすることにより，表皮層材
料２の中にコア層材料３が部分的に内包されるようにな
っている。The main body 41 has mounting holes 411 and 412 for inserting bolts, and the mounting portion 43 has similar mounting holes 431. Further, between the main body 41 and the mounting portion 43, there is a recess 45 surrounded by both. The recess 45 is a portion into which a part of the vehicle body is inserted.
The cross-sectional structure of the mudguard 4 is such that the core layer material 3 is partially included in the skin layer material 2 by reducing the thickness of the lower portion 42 as shown in FIG. There is.
そして，表皮層材料２は軟質の合成樹脂が，一方コア
層材料３は硬質の合成樹脂が用いられている。The skin layer material 2 is made of a soft synthetic resin, while the core layer material 3 is made of a hard synthetic resin.
つまり，該サンドイッチ構造のマッドガードは，柔軟
な表皮層材料２の中に硬いコア層材料３を部分的に内包
させることにより，マッドガードに柔軟性と剛性とを付
与している。That is, the sandwich-type mudguard imparts flexibility and rigidity to the mudguard by partially encapsulating the hard core layer material 3 in the flexible skin layer material 2.
ところで，上記マッドガードにおいては，本体41,取
付部43は取付部孔411,412,431において車体に取付ける
ため，剛性が高いことが要求される。一方，下片42は，
駐車場の区画ブロック等に当接したとき，容易に弾性変
形するよう柔軟性が要求される。By the way, in the mudguard, since the main body 41 and the mounting portion 43 are mounted on the vehicle body in the mounting portion holes 411, 412, 431, high rigidity is required. On the other hand, the lower piece 42 is
Flexibility is required so that it easily elastically deforms when it comes into contact with a block in a parking lot.
また，特に，本体41及び取付部43の上面側は，表皮層
２の厚みを小さくすることによってコア層による剛性を
高め，一方その下面側は表皮層２の厚みを大きくするこ
とによって表皮層による柔軟性を高めることが望まし
い。Further, in particular, the upper surface side of the main body 41 and the mounting portion 43 is increased in rigidity by the core layer by reducing the thickness of the skin layer 2, while the lower surface side thereof is increased by increasing the thickness of the skin layer 2 by the skin layer. Increased flexibility is desirable.
その理由は，上記上面側は，車体に接触する部分であ
るため，成るべくその剛性が高いことが要求され，一方
上記下面側はマッドガードの意匠面となるため，コア層
材料３による影響を少なくして滑らかな表面にするため
である。The reason is that the upper surface side is a portion that comes into contact with the vehicle body, and therefore it is required that the rigidity is as high as possible. On the other hand, the lower surface side is the design surface of the mudguard, so that the influence of the core layer material 3 is small. In order to obtain a smooth surface.
しかしながら，従来は，上記要求を満足するマッドガ
ードの製造方法が見出されていない。However, conventionally, no mudguard manufacturing method that satisfies the above requirements has been found.
本発明はかかる従来の問題点に鑑み，本体及び取付部
の上面側は剛性が高く車体接触部側として適度な剛性を
有し，一方上記下面側及び下片の表皮層は柔軟性が発揮
され，かつ意匠性に優れたマッドガードを容易に得るこ
とができる，マッドガードの製造方法を提供しようとす
るものである。In view of such conventional problems, the present invention has a high rigidity on the upper surface side of the main body and the mounting portion and an appropriate rigidity as a vehicle body contact portion side, while the lower surface side and the skin layer of the lower piece exhibit flexibility. In addition, it is an object of the present invention to provide a method for manufacturing a mudguard that can easily obtain a mudguard excellent in design.
本発明は，本体と取付部とこれらの下方に垂設した下
片とよりなり，これら三者は共に内部にコア層を外部に
は表皮層を有するサンドイッチ構造を有し，かつ上記本
体及び取付部においては上面側の上面表皮層の厚みがそ
の下面側の下面表皮層の厚みよりも小さい構造のマッド
ガードを，成形型を用いて射出成形する方法であって， まず成形型における上記本体及び取付部の上面側に位
置する型面の温度を，本体及び取付部の上記下面側及び
上記下片が位置する型面よりも高い温度に予め保持して
おき， 次いで，上記成形型内に軟化状態の表皮層材料を射出
し，その後該表皮層材料の中に軟化状態のコア層材料を
射出し， 上記表皮層材料のうち成形型の表面に接触している部
分を冷却固化させ，一方表皮層材料のうち冷却固化して
いない部分は上記コア層材料によって順次前方へ押し出
して上記厚み構造のマッドガードを成形することを特徴
とするマッドガードの製造方法にある。The present invention comprises a main body, a mounting portion, and a lower piece that is hung vertically below them, and these three members each have a sandwich structure having a core layer inside and a skin layer outside, and the main body and the mounting portion. Part is a method of injection molding a mudguard having a structure in which the thickness of the upper surface skin layer on the upper surface side is smaller than the thickness of the lower surface skin layer on the lower surface side using a molding die. The temperature of the mold surface located on the upper surface side of the part is kept higher than the temperature of the mold surface on which the lower surface side of the main body and the mounting part and the lower piece are located, and then the softened state is set in the forming mold. Of the skin layer material, then the core layer material in a softened state is injected into the skin layer material, and the portion of the skin layer material in contact with the surface of the mold is cooled and solidified, while the skin layer material The part of the material that is not cooled and solidified Is the method for producing a mudguard, which comprises forming a mud guard of the thickness structure extruded to successively forward by the core layer material.
本発明において最も注目すべきことは，本体及び取付
部の上面側に位置する型面の温度を，本体，取付部の下
面側及び下片が位置する型面の温度よりも高く保持して
おき，上記射出成形（いわゆる２ショット法）によりマ
ッドガードを成形することにある。What is most noticeable in the present invention is that the temperature of the mold surface located on the upper surface side of the main body and the mounting portion is kept higher than the temperature of the mold surface located on the lower surface side of the main body, the mounting portion and the lower piece. The purpose is to mold the mudguard by the injection molding (so-called two-shot method).
上記のごとく温度差を設ける手段としては，成形型内
の型面近くに冷却通路を設けておき，該冷却通路内に通
ずる冷却水の温度を，型面の位置によって変える方法が
ある。即ち，上記の厚い表皮層を得たい部分に面する型
面については冷却水の温度を低くしておく。一方，上記
の薄い表皮層を得たい部分に面する型面については，冷
却水の温度を高くしておく。As a means for providing the temperature difference as described above, there is a method in which a cooling passage is provided near the die surface in the forming die, and the temperature of the cooling water passing through the cooling passage is changed depending on the position of the die surface. That is, the temperature of the cooling water is lowered on the mold surface facing the portion where the thick skin layer is desired to be obtained. On the other hand, the temperature of the cooling water is raised on the mold surface facing the portion where the thin skin layer is desired to be obtained.
また，上記以外の方法として，表皮層を厚くしたい部
分には型面近くに冷却通路を設け，薄くしたい部分は型
面から遠くに冷却通路を設ける。As a method other than the above, a cooling passage is provided near the mold surface where the skin layer is desired to be thick, and a cooling passage is provided far away from the mold surface where the skin layer is desired to be thin.
また，成形型を分割型とし，各分割型を異なる温度と
なしておき，上記射出を行うこともできる。また，中子
を用い，中子と成形型本体との温度を異なるものとし，
中子に面する側と成形型本体に面する側との表皮層厚み
が異なる成形品とすることもできる。Also, the molding die may be a split mold, and the split molds may be kept at different temperatures to perform the injection. Also, using a core, the temperature of the core and the mold body are different,
It is also possible to make a molded product in which the skin layer thickness on the side facing the core is different from that on the side facing the mold body.
そして，該成形型内に軟化状態の表皮層材料を射出
し，次いで該表皮層材料中へ軟化状態のコア層材料を射
出する，いわゆる２ショット法を行う。Then, a so-called two-shot method is performed in which the softened skin layer material is injected into the mold and then the softened core layer material is injected into the skin layer material.
本発明の製造方法においては，表皮層を薄くしたい上
記本体及び取付部の上面側の型面温度を高くし，表皮層
を厚くしたい上記本体及び取付部の下面側及び上記下片
側の型面温度を低くしている。In the manufacturing method of the present invention, the mold surface temperature on the upper surface side of the main body and mounting portion where the skin layer is desired to be thin is increased, and the mold surface temperature on the lower surface side and the lower one side of the main body and mounting portion where the skin layer is desired to be thick. Is low.
そのため，成形型内に加熱された軟化状態の表皮層材
料を射出したとき，該表皮層材料は低温部分の型面にお
いては早く冷却，固化し，その厚みが大きくなる。Therefore, when the heated skin layer material is injected into the mold, the skin layer material is quickly cooled and solidified on the mold surface in the low temperature portion, and its thickness is increased.
一方，高温部分型面においては，表皮層材料は徐々に
冷却，固化するので，その固化厚みが大きくならない間
に，コア層材料がその内部の固化していない表皮層材料
を前方へ押し出していく。それ故，表皮層の厚みは大き
くならない。On the other hand, in the high temperature partial mold surface, the skin layer material gradually cools and solidifies, so that the core layer material pushes out the unsolidified skin layer material inside thereof while the solidified thickness does not increase. . Therefore, the thickness of the skin layer does not increase.
また，上記成形において，表皮層材料の射出は，後に
その中に射出するコア層材料の容量を考慮して，成形型
のキャビティの一部分が残っている状態で中止される。Further, in the above molding, the injection of the skin layer material is stopped in the state where a part of the cavity of the molding die remains in consideration of the volume of the core layer material injected into the skin layer material later.
そして，この表皮層材料の中に，軟化状態のコア層材
料が射出される。そこで，コア層材料は表皮層材料の中
を前方へ進んでいく。そして，成形型のキャビティ内は
表皮層材料とその中に囲まれたコア層材料とによって充
填される。Then, the softened core layer material is injected into the skin layer material. Therefore, the core layer material moves forward through the skin layer material. Then, the cavity of the mold is filled with the skin layer material and the core layer material surrounded by the skin layer material.
ここに重要なことは，上記コア層材料が進んでいくと
き，その周囲には表皮層材料が存在していること，及び
表皮層材料は型面の温度によって上記のごとく冷却固化
した厚みが異なることである。What is important here is that as the core layer material advances, the skin layer material exists around it, and the thickness of the skin layer material that has been cooled and solidified as described above depends on the temperature of the mold surface. That is.
そして，コア層材料が表皮層材料内を前方へ進んでい
くとき，表皮層材料のうち低温部分の型面に面している
部分の材料は，固化部分が厚いので，流動するコア層材
料と接触している表皮層材料の内側はコア層材料によっ
て余り前方へ持ち運ばれない。When the core layer material moves forward in the skin layer material, the part of the skin layer material facing the mold surface of the low temperature portion has a thick solidified portion, so The inside of the skin layer material in contact is not carried too far forward by the core layer material.
一方，高温部分の型面に面している部分の表皮層材料
は，余り冷却されず，固化部分も薄いので，流動するコ
ア層材料と接触している表皮層材料の内側はコア層材料
によって前方へ持ち運ばれる。それ故，高温部分型面に
面している部分の表皮層材料は，薄く形成される。On the other hand, the skin layer material in the part facing the mold surface of the high temperature part is not cooled so much and the solidified part is thin, so the inside of the skin layer material in contact with the flowing core layer material is Carried forward. Therefore, the skin layer material in the portion facing the hot partial mold surface is formed thin.
よって，上記本体及び取付部における上記上面表皮層
の厚みが，上記下面表皮層の厚みよりも小さい構造のサ
ンドイッチ構造のマッドガードが得られる。Therefore, it is possible to obtain a mudguard having a sandwich structure in which the thickness of the upper surface skin layer in the main body and the mounting portion is smaller than the thickness of the lower surface skin layer.
そして，上記構造のマッドガードによれば，上記上面
表皮層は厚みが薄いためコア層材料による剛性が高く発
揮され，車体接触部側として適度な剛性を有し，一方本
体，取付部の下面側の下面表皮層及び下片の左右側の表
皮層は厚いために表皮層材料による柔軟性が発揮され
て，優れた意匠面を呈する。According to the mudguard having the above structure, since the upper surface skin layer is thin, the rigidity due to the core layer material is high, and the rigidity is appropriate as the vehicle body contact portion side, while the body and the lower surface side of the mounting portion are Since the bottom skin layer and the skin layers on the left and right sides of the lower piece are thick, the flexibility of the skin layer material is exerted to provide an excellent design surface.
したがって，本発明によれば，マッドガードの上記上
面表皮層の厚みが上記下面表皮層の厚みよりも小さいサ
ンドイッチ構造を有し，本体及び取付部の上面側は剛性
が高く車体接触部側として適度な剛性を有し，一方上記
下面表皮層及び下片の表皮層は表皮層材料による柔軟性
が発揮され，かつ意匠性に優れたマッドガードを，容易
に得ることができる，マッドガードの製造方法を提供す
ることができる。Therefore, according to the present invention, the mudguard has a sandwich structure in which the thickness of the upper surface skin layer is smaller than the thickness of the lower surface skin layer, and the upper surfaces of the main body and the mounting portion have high rigidity and are suitable as the vehicle body contact portion side. Provided is a method for manufacturing a mudguard, which has rigidity, while the lower surface skin layer and the lower surface skin layer exhibit flexibility due to the material of the skin layer and can easily obtain a mudguard excellent in designability. be able to.
本発明の実施例にかかるマッドガードの製造方法につ
いて，第１図〜第６図を用いて説明する。本例は，自動
車用マッドガードを成形しようとするものである。該マ
ッドガード４は，第５図及び第６図に示すごとく，本体
41と取付部43とこれらの下方に垂設した下片42とよりな
る。また，該マッドガード４は，コア層材料３とその外
側を覆う表皮層材料２とからなるサンドイッチ構造を有
する。A method of manufacturing the mudguard according to the embodiment of the present invention will be described with reference to FIGS. This example is intended to form a mudguard for automobiles. The mudguard 4 has a main body as shown in FIGS.
41, a mounting portion 43, and a lower piece 42 vertically provided below these. Further, the mudguard 4 has a sandwich structure composed of a core layer material 3 and a skin layer material 2 covering the outside thereof.
そして，ここに重要なことは，同図に示すごとく，本
体41及び取付部43においては，その上面側の上面表皮層
21は薄く，その下面側の下面表皮層22は厚いことであ
る。また，下片42においては，左右両側の表皮層23が特
に厚いことである。What is important here is that, as shown in the figure, in the main body 41 and the mounting portion 43, the upper surface skin layer on the upper surface side thereof.
21 is thin, and the lower surface skin layer 22 on the lower surface side is thick. Further, in the lower piece 42, the epidermal layers 23 on the left and right sides are particularly thick.
また，上記取付部43下方においては，下片42との分岐
点近くに，凹状溝435を有する。該凹状溝435は，成形型
の流動抵抗部105によって形成された部分である。In addition, below the mounting portion 43, a concave groove 435 is provided near the branch point with the lower piece 42. The concave groove 435 is a portion formed by the flow resistance portion 105 of the molding die.
次に，上記マッドガード４の成形方法につき説明す
る。Next, a method of forming the mudguard 4 will be described.
まず，この成形方法に用いる成形型１は，第１図に示
すごとく，分割型11〜13からなる。そして，これら分割
型によって囲まれた部分が，マッドガード成形用のキャ
ビティ10を構成する。First, the molding die 1 used in this molding method is composed of split molds 11 to 13, as shown in FIG. The portion surrounded by these split molds constitutes a cavity 10 for mudguard molding.
該キャビテイ10は，本体形成部101,下片形成部102,取
付部形成部103よりなる。そして，分割型11及び12は，
その型面近くにそれぞれ複数の冷却通路16を有する。ま
た，分割型13もその型面近くに冷却通路17を有する。ま
た，分割型13は，上記取付部形成部103の入口部近傍
に，突出した流動抵抗部105を有する。The cavity 10 includes a body forming portion 101, a lower piece forming portion 102, and a mounting portion forming portion 103. And the split molds 11 and 12 are
A plurality of cooling passages 16 are provided near the mold surface. The split mold 13 also has a cooling passage 17 near the mold surface. Further, the split mold 13 has a protruding flow resistance portion 105 in the vicinity of the inlet portion of the mounting portion forming portion 103.
また分割型11は，本体形成部101に開口するゲート18
を有する。該ゲート18は，表皮層材料注入用の射出成形
機，及びコア層材料注入用の射出成形機（図示略）に連
結している。In addition, the split mold 11 includes a gate 18 that opens to the main body forming portion 101.
Have. The gate 18 is connected to an injection molding machine for injecting a skin layer material and an injection molding machine (not shown) for injecting a core layer material.
次に，射出成形方法につき第２図〜第４図を用いて説
明する。Next, the injection molding method will be described with reference to FIGS.
まず，第２図に示すごとく，分割型11,12の冷却通路1
6に低温（例えば10℃）の冷却水を流しておく。また，
分割型13の冷却通路17には，高温（例えば20℃）の冷却
水を流しておく。First, as shown in FIG. 2, the cooling passages 1 of the split molds 11 and 12 are shown.
Pour low-temperature (eg 10 ℃) cooling water into 6. Also,
High-temperature (for example, 20 ° C.) cooling water is allowed to flow in the cooling passage 17 of the split mold 13.
次に，本体形成部101内に，ゲート18より表皮層材料
２を射出する。この表皮層材料２の射出量は，キャビテ
ィ容量からコア層材料の容量を差し引いた容量である。Next, the skin layer material 2 is injected from the gate 18 into the main body forming portion 101. The injection amount of the skin layer material 2 is the capacity obtained by subtracting the capacity of the core layer material from the cavity capacity.
しかして，この射出時においては，表皮層材料２は本
体形成部101内を前方へ押されていく。このとき，キャ
ビティー壁に接触した部分の表皮層材料２は，固化し表
皮層を形成する。そして，表皮層材料２の先端が取付部
形成部103と下片102との分岐点に達したとき，取付部形
成部103側には流動抵抗部105があるため，表皮層材料２
は流動抵抗の少ない下片形成部102側により多く流入し
ていく。そして，取付部形成部103側には少量の表皮層
材料が入っていく。Then, at the time of this injection, the skin layer material 2 is pushed forward in the main body forming portion 101. At this time, the skin layer material 2 in the portion in contact with the cavity wall is solidified to form a skin layer. When the tip of the skin layer material 2 reaches the branch point between the attachment portion forming portion 103 and the lower piece 102, the flow resistance portion 105 is present on the attachment portion forming portion 103 side, so that the skin layer material 2
Flows into the lower piece forming portion 102 side with less flow resistance. Then, a small amount of the skin layer material enters the mounting portion forming portion 103 side.
次に，上記表皮層材料２の射出後は，第３図に示すご
とく，本体形成部101の表皮層材料２内にゲート18より
コア層材料３を射出していく。この射出により，コア層
材料３は表皮層材料２内を前方に進んでいき，また表皮
層材料２の中央部分は更に前方に押されていく。そし
て，キャビティ内は表皮層材料２とその内部のコア層材
料３によって充填される。Next, after the injection of the skin layer material 2, as shown in FIG. 3, the core layer material 3 is injected from the gate 18 into the skin layer material 2 of the main body forming portion 101. By this injection, the core layer material 3 advances in the skin layer material 2 forward, and the central portion of the skin layer material 2 is pushed further forward. Then, the inside of the cavity is filled with the skin layer material 2 and the core layer material 3 therein.
その後は，表皮層材料２及びコア層材料３からなる成
形品の全体を冷却，固化させ，成形型１より成形品を取
り出す。該成形品は，前記第５図，第６図に示したマッ
ドガード４である。After that, the entire molded product made of the skin layer material 2 and the core layer material 3 is cooled and solidified, and the molded product is taken out from the molding die 1. The molded product is the mudguard 4 shown in FIGS. 5 and 6.
そして，上記製造過程において重要なことは，本体41
及び取付部43の下面側，及び下片42の左右両側面を成形
するための分割型11及び12の冷却通路16には低温の冷却
水を流し，一方本体41及び取付部43の上面側を成形する
ための分割型13には高温の冷却水を流してあることであ
る。The important thing in the manufacturing process is that the main body 41
Also, low-temperature cooling water is caused to flow in the cooling passage 16 of the split molds 11 and 12 for molding the lower surface side of the mounting portion 43 and the left and right side surfaces of the lower piece 42, while the upper surface side of the main body 41 and the mounting portion 43 is That is, high-temperature cooling water is flowing through the split mold 13 for molding.
そのため，本体形成部101及び取付部形成部103内に入
った表皮層材料２は，分割型11,12の型面においては型
面温度が低いので早く冷却通路されて固化する。それ
故，その厚みが大きくなる。一方，分割型13の型面にお
いては，型面温度が高いので徐々に冷却，固化する。そ
れ故，その厚みが小さい。Therefore, the skin layer material 2 that has entered the main body forming portion 101 and the attachment portion forming portion 103 has a low mold surface temperature on the mold surfaces of the split molds 11 and 12, so that it is quickly cooled and solidified. Therefore, its thickness becomes large. On the other hand, the mold surface of the split mold 13 is gradually cooled and solidified because the mold surface temperature is high. Therefore, its thickness is small.
また，下片形成部102においては，分割型11と12の両
型面の温度が低いので，表皮層材料２はその両側面より
強く冷却される。そのため，その厚みが大きくなり，そ
の中に入るコア層材料３の厚みは薄くなる。なお，下片
形成部102内は，前記流動抵抗部105の存在によって，表
皮層材料２がより早く入るため，その先端部25は表皮層
材料２のみとなる。Further, in the lower piece forming portion 102, since the temperature of both mold surfaces of the split molds 11 and 12 is low, the skin layer material 2 is cooled more strongly than both side surfaces thereof. Therefore, the thickness becomes large, and the thickness of the core layer material 3 contained therein becomes thin. Since the skin layer material 2 enters the lower piece forming portion 102 earlier due to the presence of the flow resistance portion 105, the tip portion 25 thereof is only the skin layer material 2.
上記により，前記第５図に示したごとく，本体41及び
取付部43の上面側の上面表皮層21は薄く，その下面側の
下面表皮層22が厚く，また下片42の左右の表皮層23が厚
い，サンドイッチ構造のマッドガードが得られる。As described above, as shown in FIG. 5, the upper surface skin layer 21 on the upper surface side of the main body 41 and the mounting portion 43 is thin, the lower surface skin layer 22 on the lower surface side is thick, and the left and right skin layers 23 of the lower piece 42. A thick mudguard with a sandwich structure is obtained.
また，該マッドガード４は上記構成を有するので，本
体41及び取付部43の意匠面となる下面の下面表皮層22は
厚く形成されている。そのため，この下面表皮層22は，
コア層材料３に影響されることなく，柔軟性が発揮さ
れ，良好な意匠面を得ることができる。Further, since the mudguard 4 has the above-mentioned structure, the lower surface skin layer 22 on the lower surface which is the design surface of the main body 41 and the mounting portion 43 is formed thick. Therefore, this lower surface skin layer 22 is
Flexibility is exhibited without being affected by the core layer material 3, and a good design surface can be obtained.
また，上面の上面表皮層21は薄く形成しているので，
車体接触部側として適度な剛性を発揮し，またコア層材
料３の厚みを一定厚みに確保でき，全体として適度の剛
性を得ることができる。Moreover, since the upper surface skin layer 21 on the upper surface is formed thin,
It exhibits appropriate rigidity on the side of the vehicle body contact portion, and the thickness of the core layer material 3 can be ensured to be a constant thickness, so that appropriate rigidity can be obtained as a whole.
また，下片42はコア層材料３が少ないので，特に柔軟
性を有している。In addition, the lower piece 42 is particularly flexible because the core layer material 3 is small.
第１図〜第６図は実施例を示し，第１図は成形型の断面
図，第２図〜第４図は成形時における樹脂流れの説明
図，第５図は第６図のＡ−Ａ線矢視断面図，第６図はマ
ッドガードの斜視図，第７図及び第８図は従来のマッド
ガードを示し，第７図はその斜視図，第８図は第７図の
Ｂ−Ｂ線矢視断面図である。 １……成形型， 10……キャビティ， 16……低温側の冷却通路， 17……高温側の冷却通路， 101……本体形成部， 102……下片形成部， 103……取付部形成部， ２……表皮層材料， 21……上面表皮層， 22……下面表皮層， ３……コア層材料， ４……マッドガード， 41……本体， 42……下片， 43……取付部，1 to 6 show an embodiment, FIG. 1 is a sectional view of a molding die, FIGS. 2 to 4 are explanatory views of a resin flow at the time of molding, and FIG. 5 is A- in FIG. A sectional view taken along the line A, FIG. 6 is a perspective view of a mudguard, FIGS. 7 and 8 show a conventional mudguard, FIG. 7 is its perspective view, and FIG. 8 is a BB line of FIG. FIG. 1 ... Mold, 10 ... Cavity, 16 ... Low temperature side cooling passage, 17 ... High temperature side cooling passage, 101 ... Main body forming part, 102 ... Lower piece forming part, 103 ... Mounting part forming Part, 2 ... Skin layer material, 21 ... Top skin layer, 22 ... Bottom skin layer, 3 ... Core layer material, 4 ... Mudguard, 41 ... Main body, 42 ... Bottom piece, 43 ... Mounting Department,
Claims (1)
片とよりなり，これら三者は共に内部にコア層を外部に
は表皮層を有するサンドイッチ構造を有し，かつ上記本
体及び取付部においては上面側の上面表皮層の厚みがそ
の下面側の下面表皮層の厚みよりも小さい構造のマッド
ガードを，成形型を用いて射出成形する方法であって， まず成形型における上記本体及び取付部の上面側に位置
する型面の温度を，本体及び取付部の上記下面側及び上
記下片が位置する型面よりも高い温度に予め保持してお
き， 次いで，上記成形型内に軟化状態の表皮層材料を射出
し，その後該表皮層材料の中に軟化状態のコア層材料を
射出し， 上記表皮層材料のうち成形型の表面に接触している部分
を冷却固化させ，一方表皮層材料のうち冷却固化してい
ない部分は上記コア層材料によって順次前方へ押し出し
て上記厚み構造のマッドガードを成形することを特徴と
するマッドガードの製造方法。1. A main body, a mounting portion, and a lower piece suspended downward from the main body, and these three members each have a sandwich structure having a core layer inside and a skin layer outside, and the body and A method of injection-molding a mudguard having a structure in which the thickness of the upper surface skin layer on the upper surface side is smaller than the thickness of the lower surface skin layer on the lower surface side of the mounting portion using a molding die. The temperature of the mold surface located on the upper surface side of the mounting portion is maintained in advance at a temperature higher than the temperature of the mold surface on which the lower surface side of the main body and the mounting portion and the lower piece are located, and then softening in the molding die. The skin layer material in the state is injected, and then the core layer material in the softened state is injected into the skin layer material, and the portion of the skin layer material in contact with the surface of the mold is cooled and solidified. Not cooled and solidified among layer materials Min mudguard manufacturing method, which comprises forming a mud guard of the thickness structure extruded to successively forward by the core layer material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071355A JP2537691B2 (en) | 1990-03-20 | 1990-03-20 | Matt Guard Manufacturing Method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071355A JP2537691B2 (en) | 1990-03-20 | 1990-03-20 | Matt Guard Manufacturing Method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3174530A Division JP2870233B2 (en) | 1991-06-18 | 1991-06-18 | Mat guard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04126212A JPH04126212A (en) | 1992-04-27 |
| JP2537691B2 true JP2537691B2 (en) | 1996-09-25 |
Family
ID=13458104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2071355A Expired - Fee Related JP2537691B2 (en) | 1990-03-20 | 1990-03-20 | Matt Guard Manufacturing Method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2537691B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56164830A (en) * | 1980-05-26 | 1981-12-18 | Hitachi Ltd | Mold for sandwich structure body |
-
1990
- 1990-03-20 JP JP2071355A patent/JP2537691B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04126212A (en) | 1992-04-27 |
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