JPH02206518A - Molding of plastic molded product - Google Patents

Molding of plastic molded product

Info

Publication number
JPH02206518A
JPH02206518A JP2624289A JP2624289A JPH02206518A JP H02206518 A JPH02206518 A JP H02206518A JP 2624289 A JP2624289 A JP 2624289A JP 2624289 A JP2624289 A JP 2624289A JP H02206518 A JPH02206518 A JP H02206518A
Authority
JP
Japan
Prior art keywords
cavity
hard material
soft material
core
slide core
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.)
Granted
Application number
JP2624289A
Other languages
Japanese (ja)
Other versions
JP2622876B2 (en
Inventor
Tomoaki Komiyama
小宮山　知明
Hiroshi Mukai
浩 向井
Akihiro Yoshida
彰浩 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyoda Gosei Co Ltd
Original Assignee
Toyoda Gosei Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyoda Gosei Co Ltd filed Critical Toyoda Gosei Co Ltd
Priority to JP2624289A priority Critical patent/JP2622876B2/en
Publication of JPH02206518A publication Critical patent/JPH02206518A/en
Application granted granted Critical
Publication of JP2622876B2 publication Critical patent/JP2622876B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • 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
    • B29C2045/1654—Making multilayered or multicoloured articles having a "sandwich" structure whereby the core material is penetrating through the skin

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)

Abstract

PURPOSE:To fill the circumference of a through hole with a hard material, by a method wherein a cave part on the inside of a molding tool is covered with a slide core, a soft material is cast, then the hard material is cast into the said soft material, the slide core is opened at the time of a rise of inner pressure and the hard material is cast further. CONSTITUTION:Split molds 21, 22, 23 are combined with one another and a cavity 25 and cave part 26 corresponding to an external form of a mud guard 7 are formed. A slide core 3 movable in e vertical direction is provided on the cave part 26. When the front of the cave part 26 is closed with a main body 30, a core pin 31 is in a pin hole 231 of the split mold 23. A soft material for skin layer molding is injected within the cavity through an injection hole 24. Then a hard material 11 is cast into the soft material 12 and the inside of the cave part 26 is filled with the soft material 12 and hard material 11 which is in the soft material 12. Therefore, the cave part 26 becomes a state where the hard material is surrounded by the soft material, in the cave part 26.

Description

【発明の詳細な説明】 ［産業上の利用分野〕 本発明は、ボルト等により締付けるための締付は用貫通
孔を有する、グ、ラスチ・ンク成形品の成形方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for molding a glue molded product having a through hole for tightening with a bolt or the like.

〔従来技術〕[Prior art]

各種プラスチック成形品の中には、これを他の物体にボ
ルトなどにより締付は固定するための取付は部を有し、
該取付は部には締付は用の貫通孔を有するものがある。Some of the various plastic molded products have a mounting section for fixing them to other objects with bolts, etc.
Some of the mounting parts have through holes for tightening.

従来２例えば、自動車の車輪後方に取付けるマッドガー
ド９は　第９図に示すごとく、車体の外板に接触させる
本体９１とその下方に設けた下片９２と、上記本体９１
の後方に設けた取付部分９３とからなる。また、取付部
分９３には、ボルト等により該マッドガード９を車体に
締付は固定するための貫通孔９４を有する。Conventional 2 For example, as shown in FIG. 9, a mudguard 9 that is attached to the rear of a wheel of an automobile includes a main body 91 that contacts the outer panel of the vehicle body, a lower piece 92 provided below the main body 91, and a lower piece 92 that is provided below the main body 91.
It consists of a mounting part 93 provided at the rear of the. The mounting portion 93 also has a through hole 94 for tightening and fixing the mudguard 9 to the vehicle body with bolts or the like.

該マッドガードにおいては、特に車体９１及び取付部分
９３に剛性を付与し、またマッドガード全体に柔軟性を
付与するために、同図に示すごときサンドイッチ成形品
とすることが試みられている。即ち、車体９１の内部及
び取付部分９３の内部に硬質材１１のコア層を設け、そ
の外周には軟質材１２の表皮層を形成するものである。In order to impart rigidity to the vehicle body 91 and the mounting portion 93, and to impart flexibility to the entire mudguard, an attempt has been made to form the mudguard into a sandwich molded product as shown in the figure. That is, a core layer of hard material 11 is provided inside the vehicle body 91 and inside the attachment portion 93, and a skin layer of soft material 12 is formed around the outer periphery of the core layer.

しかして、かかるサンドイッチ成形品の成形法としては
、第１Ｏ図に示すごとく、マッドガードの本体と取付は
部とを形成するためのキャビティ８１と、該キャビティ
８１内に設けた中子ピン８２とを有する成形型８０を用
いる。そして、キャピテイ８１内に表皮層を形成するた
めの軟質材１２を射出し２次いで該軟質材１２の中にコ
ア層形成用の硬質材１１を注入し、キャビティ８１内を
充填し、冷却固化する。As shown in FIG. 1O, the method for forming such a sandwich molded product is to form a cavity 81 for forming the main body and the mounting part of the mudguard, and a core pin 82 provided in the cavity 81. A mold 80 having a mold 80 is used. Then, a soft material 12 for forming a skin layer is injected into the cavity 81, and then a hard material 11 for forming a core layer is injected into the soft material 12, filling the inside of the cavity 81, and cooling and solidifying. .

これにより、前記第９図に示したごとき、サントイ、予
成形品のマッドガードを得ることができ〔解決しようと
する課題〕 しかしながら、上記従来法により得られるマッドガード
は５第９図に示すごとく９貫通孔９４の周囲は軟質材１
２のみで占められ、硬質材１１が回り込んでいないもの
がある。それ故２貫通孔９４内にボルト等の締付は具を
挿入して、取付は部９３を締付けようとしても９貫通孔
９４の周囲は軟質材１２のみであるため、締付けに必要
なトルクを加えることが困難である。As a result, it is possible to obtain a pre-formed mudguard as shown in FIG. 9. [Problem to be solved] The area around the hole 94 is made of soft material 1.
There are some cases in which the hard material 11 does not wrap around. Therefore, even if you try to tighten the bolts etc. by inserting a tool into the 2nd through hole 94 and tighten the part 93, the area around the 9th through hole 94 is only the soft material 12, so the torque required for tightening is not enough. difficult to add.

このような状態となる理由は、明らかではないが、前記
第９図、第１０図からも知られるごとく。Although the reason for this state is not clear, it is known from FIGS. 9 and 10.

取付部分において貫通孔の先端方向には余りスペースが
ない、そのため、サンドイッチ成形時に先行する軟質材
が、この貫通孔の周辺に滞留し、後から注入する硬質材
が貫通孔周辺まで行き渡らないためと考えられる。There is not much space in the direction of the tip of the through-hole in the mounting part, so the soft material that precedes the sandwich molding stays around the through-hole, and the hard material that is injected later does not reach around the through-hole. Conceivable.

このように１貫通孔を有するサンドイッチ成形品におい
ては、従来貫通孔の周囲に硬質材を行き渡らせることは
困難である。In such a sandwich molded product having one through hole, it is conventionally difficult to spread the hard material around the through hole.

本発明は、かかる従来の問題点に鑑みサントイツナ成形
において２貫通孔の周囲に硬質材を充填することができ
るプラスチック成形品の成形方法を提供しようとするも
のである。In view of these conventional problems, the present invention aims to provide a method for molding a plastic molded product in which the periphery of two through holes can be filled with a hard material in Santoituna molding.

〔課題の解決手段〕[Means for solving problems]

本発明は１本体と、締付は用の貫通孔を有する取付部分
とからなり、上記本体は硬質材からなるコア層と該コア
層の表面に被覆した軟質材からなる表皮層とにより構成
され、一方取付部分は実質的に硬質材のみからなるプラ
スチック成形品をサンドイッチ成形するに当り、成形品
の形状を有するキャビティ内に前記取付部分を成形する
ための空洞部を連設すると共に、該空洞部内には該空洞
部内の途中を遮閉できるスライドコアーを設けまた該ス
ライドコアーには貫通孔形成用の中子ピンを設けた成形
型を用いて成形を行うものである。The present invention consists of a main body and a mounting part having a through hole for tightening, and the main body is composed of a core layer made of a hard material and a skin layer made of a soft material coated on the surface of the core layer. On the other hand, when the mounting part is sandwich-molded with a plastic molded product made of substantially only a hard material, a cavity for molding the mounting part is provided in a cavity having the shape of the molded product, and the cavity is A slide core capable of closing the middle of the cavity is provided inside the section, and molding is performed using a mold provided with a core pin for forming a through hole in the slide core.

そして、その成形に当たっては、上記スライドコアーを
閉止した状態において上記キャビティ内に前記軟質材を
射出し、その後膣軟質材の中に硬質材を注入し、キャビ
ティ内への注入がほぼ完了して内圧が上昇する時点にお
いて５前記中子ピンは空洞部内に残した状態で前記スラ
イドコアーを開き、該スライドコアーに接している表皮
を硬質材によって破らせて該硬質材を上記空洞部内前方
まで流入させることを特徴とするものである。In molding, the soft material is injected into the cavity with the slide core closed, and then the hard material is injected into the vaginal soft material, and when the injection into the cavity is almost completed, the internal pressure At the point in time when the core pin 5 is raised, the slide core is opened with the core pin remaining in the cavity, the skin in contact with the slide core is broken by a hard material, and the hard material flows into the cavity to the front. It is characterized by this.

本発明において、スライドコアーは、前記空洞部の途中
を遮閉し、その前方へ軟質材が流入することを阻止する
ための遮閉具である。しかして。In the present invention, the slide core is a closing device that closes off the middle of the cavity and prevents the soft material from flowing forward thereof. However.

該スライドコアーには貫通孔を形成するための中子ピン
を設ける。咳中子ピンは、第４図及び第５図に示すごヤ
くスライドコアー本体と一体的に形成したもの、第８図
に示すごと（スライドコアー本体と分離したものなどが
ある。The slide core is provided with a core pin for forming a through hole. There are two types of cough core pins: those shown in FIGS. 4 and 5 that are formed integrally with the body of the slide core, and those shown in FIG. 8 (separated from the body of the slide core).

本発明により得られるプラスチック成形品においては、
上記貫通孔を設けた取付は部分が実質的に硬質材による
コア層で構成されている。In the plastic molded product obtained by the present invention,
The above-mentioned through-hole mounting is comprised essentially of a core layer of hard material.

しかして、上記硬質材としては、ＡＢＳ樹脂。However, the hard material mentioned above is ABS resin.

硬質ＰＶＣ樹脂、タルク等のフィラー入りのポリプロピ
レン樹脂、などがある、また、これら樹脂にグラスファ
イバー等を混入させた樹脂などもあまた、軟質材として
は、ポリプロピレンにＥＰＤＭをブレンドした樹脂、Ｅ
ＶＡ樹脂、５ＥＢＳ（スチレン・エチレン・ブタジェン
・スチレン）樹脂、ＳＢＳ　（スチレン・ブタジェン・
スチレン）樹脂、軟質ＰＶＣ樹脂などがある。There are hard PVC resins, polypropylene resins with fillers such as talc, etc. There are also resins made by mixing these resins with glass fiber, etc. As for soft materials, there are resins made by blending EPDM with polypropylene, etc.
VA resin, 5EBS (styrene, ethylene, butadiene, styrene) resin, SBS (styrene, butadiene,
Styrene) resin, soft PVC resin, etc.

また、軟質材中へ硬質材を注入する場合には。Also, when injecting a hard material into a soft material.

硬質材の周囲に軟質材を併せて注入することもできる。A soft material can also be injected around the hard material.

〔作　用〕[For production]

本発明においては５成形に当り、まず成形型内の前記空
洞部をスライドコアーによって遮閉した状態となし、そ
の後キャビティ内に軟質材を射出する０次いで、軟質材
の中に硬質材を注入し、キャビティ内への注入がほぼ完
了してキャビティ内の圧力が上昇する時点において、中
子ピンを空洞部内に残した状態でスライドコアーを開く
。そして、更に硬質材を注入する。In the present invention, in the step 5 of molding, first the cavity in the mold is closed off by a slide core, and then a soft material is injected into the cavity.Next, a hard material is injected into the soft material. When the injection into the cavity is almost completed and the pressure inside the cavity increases, the slide core is opened with the core pin remaining in the cavity. Then, further hard material is injected.

上記において、キャビティの内圧が上昇する時点という
のは、キャビティ内が軟質材とその中に注入された硬質
材とによってほぼ充満された時点である。そして、この
とき、上記空洞部内のスライドコアーには軟質材の先頭
部分が接触し、該軟質材の少し後方に硬質材が位置して
いる（第２図）、また、このときキャビテイ壁に接触し
ている軟質材は冷却されて固化している。In the above, the point at which the internal pressure of the cavity increases is the point at which the inside of the cavity is almost filled with the soft material and the hard material injected therein. At this time, the leading part of the soft material contacts the slide core inside the cavity, and the hard material is located slightly behind the soft material (Fig. 2). Also, at this time, it contacts the cavity wall. The soft material is cooled and solidified.

そこで、上記のごとく、スライドコアーを開くとスライ
ドコアー前方にあった軟質材は、前記のごとく更に押入
される硬質材によって空洞部の前方へ押される。しかし
、該軟質材の周囲は前記のごとく冷却固化しているため
、硬質材によって軟質材の前方が破られ、硬質材のみが
空洞部の前方へ進んでいく、そして、空洞部の内部には
上記のごとく中子ピンが残されているので、硬質材は咳
中子ピンの周囲及び空洞部の内部に充填される。Therefore, as described above, when the slide core is opened, the soft material that was in front of the slide core is pushed forward into the cavity by the hard material that is further pushed in as described above. However, since the area around the soft material is cooled and solidified as described above, the front part of the soft material is broken by the hard material, and only the hard material advances to the front of the cavity. Since the core pin remains as described above, the hard material is filled around the core pin and inside the cavity.

その後は、軟質材及び硬質材を冷却固化し、成形型内よ
りプラスチック成形品を取り出す。Thereafter, the soft material and the hard material are cooled and solidified, and the plastic molded product is taken out from the mold.

それ故、該成形品は、中子ピンのあった部分が貫通孔と
なり、空洞部の部分が取付部分となり。Therefore, in the molded product, the part where the core pin was located becomes the through hole, and the hollow part becomes the mounting part.

貫通孔の回りが実質的に硬質材によって形成された上記
成形品を得ることができる。しかして、上記取付部分の
硬質材の中には、硬質材によって破られ硬質材と共に空
洞部内に入った軟質材が含有されている。また、該成形
品の本体部分はサンドイッチ構造となっている。The molded article described above can be obtained in which the area around the through hole is substantially formed of a hard material. Therefore, the hard material of the attachment portion contains soft material that has been broken by the hard material and entered the cavity together with the hard material. Further, the main body portion of the molded product has a sandwich structure.

〔効　果〕〔effect〕

したがって５本発明によれば、サンドイッチ成形におい
て２貫通孔の周囲に硬質材を充填することができるプラ
スチック成形品を成形することができる。Therefore, according to the present invention, it is possible to mold a plastic molded product in which the periphery of the two through holes can be filled with a hard material in sandwich molding.

（実施例） 第１実施例 本発明を、自動車のマッドガードの成形法に適用した例
につき、第１図〜第７図を用いて説明する。(Embodiments) First Embodiment An example in which the present invention is applied to a method of molding a mudguard for an automobile will be described with reference to FIGS. 1 to 7.

本例において得ようとするマッドガード７は第６図及び
第７図に示すごとく、本体７１とその下方に設けた下片
７２と、上記本体７１の後方に設けた取付部分７３とよ
りなる。該取付部分７３には、締付は用の貫通孔７４を
有する。The mudguard 7 to be obtained in this example consists of a main body 71, a lower piece 72 provided below the main body 71, and a mounting portion 73 provided at the rear of the main body 71, as shown in FIGS. The mounting portion 73 has a through hole 74 for tightening.

しかして、上記本体７１と下片７２上方には。However, above the main body 71 and the lower piece 72.

硬質材１１からなるコア層を有し、該コア層の外周は軟
質材１２からなる表皮層が形成されている。It has a core layer made of a hard material 11, and a skin layer made of a soft material 12 is formed around the outer periphery of the core layer.

つまり、サンドイッチ構造を呈している。そして取付部
分７３は１本体７１近くにおいてはサンドイッチ構造を
呈するが、それより前方は硬質材１１のみによって構成
されている。即ち９貫通孔７４の回りは硬質材１１のみ
である。In other words, it has a sandwich structure. The mounting portion 73 exhibits a sandwich structure near the main body 71, but the portion in front thereof is constructed only of the hard material 11. That is, the area around the 9 through holes 74 is made of only the hard material 11.

しかして、かかるマッドガード７を成形するに当たって
は、第１図〜第５図に示す成形型及び方法を用いる。In molding this mudguard 7, the mold and method shown in FIGS. 1 to 5 are used.

まず、成形型は第１図に示すごとく１分割型２１．２２
．２３を用い、これらを組合わせたとき。First, the mold is a one-piece mold 21.22 as shown in Figure 1.
．． When using 23 and combining these.

その内部に前記マッドガード７の外形に相応するキャビ
ティ２５及び空洞部２６が形成される。上記空洞部２６
は、マッドガード７の取付部分７３を形成するためのキ
ャビティ部分である。A cavity 25 and a cavity 26 corresponding to the outer shape of the mudguard 7 are formed inside the mudguard. The cavity 26
is a cavity portion for forming a mounting portion 73 of the mudguard 7.

また、上記空洞部２６には上下方向に移動可能なスライ
ドコアー３を設ける。冨亥スライドコアー３は、第４図
、第５図に示すごとく、本体３０と。Further, the hollow portion 26 is provided with a slide core 3 that is movable in the vertical direction. The Tomi slide core 3 has a main body 30 as shown in FIGS. 4 and 5.

その上方に設けた棒状の中子ピン３１と、下方に設けた
制御棒３２とよりなる。該本体３０は分割型２２のガイ
ド孔２２１に挿入されている。また制御棒３２は１分割
型２°２の下方に設けた制御機（図示略）に連結しであ
る。It consists of a rod-shaped core pin 31 provided above and a control rod 32 provided below. The main body 30 is inserted into the guide hole 221 of the split mold 22. Further, the control rod 32 is connected to a controller (not shown) provided below the one-part type 2°2.

次に、上記成形型２を用いてマッドガードを成形するに
当たっては、前記第１図に示すごとく型組みを行なうと
共に、スライドコアー３を上昇させてその本体３０によ
り空洞部２６の前方を閉じる。このとき、中子ピン３１
は分割型２３のピン孔２３１内に入っている。その後、
射出孔２４を通じて１表皮層形成用の軟質材をキャビテ
ィ内に射出する。この軟質材の量は１表皮層を形成する
に足る量である。Next, when molding a mudguard using the mold 2, the mold is assembled as shown in FIG. 1, and the slide core 3 is raised to close the front of the cavity 26 with its main body 30. At this time, the core pin 31
is inserted into the pin hole 231 of the split mold 23. after that,
A soft material for forming one skin layer is injected into the cavity through the injection hole 24. This amount of soft material is sufficient to form one skin layer.

次いで、第２図に示すごとく、軟質材１２中に硬質材１
１を注入する。そして、キャビティ２５及びスライドコ
アー３よりも前方の空洞部２６内が軟質材１２及びその
中の硬質材１１によって充填された時点で、キャビティ
２５内の樹脂圧力が上昇する。この圧力上昇を検出して
、スライドコアー３の制御棒３２を制御機により下方に
引く。Next, as shown in FIG. 2, the hard material 1 is inserted into the soft material 12.
Inject 1. When the cavity 25 and the cavity 26 in front of the slide core 3 are filled with the soft material 12 and the hard material 11 therein, the resin pressure in the cavity 25 increases. This pressure increase is detected and the control rod 32 of the slide core 3 is pulled downward by the controller.

これにより第３図、第４図に示すごとく、スライドコア
ーの本体３０が分割型２２のガイド孔２２１内に入り、
スライドコアー上方の中子ピン３１のみが空洞部２６内
に位置する。As a result, as shown in FIGS. 3 and 4, the main body 30 of the slide core enters the guide hole 221 of the split mold 22, and
Only the core pin 31 above the slide core is located within the cavity 26.

そこで、硬質材１１が軟質材１２の先端部を破って空洞
部２６前方に流れ込む。Then, the hard material 11 breaks the tip of the soft material 12 and flows into the front of the cavity 26.

即ち、第２図に示すごとく、スライドコアー３が閉じら
れているときには、空洞部２６内の樹脂は先端部に軟質
材１２があって、その中に硬質材１１が包まれた状態に
ある。また、この先端部の軟質材１２は成形型壁面に接
している部分が冷却固化している。そして、上記硬質材
１１は、未だ加圧注入されている状態にある。That is, as shown in FIG. 2, when the slide core 3 is closed, the resin in the cavity 26 has a soft material 12 at its tip, and the hard material 11 is wrapped therein. Further, the portion of the soft material 12 at the tip that is in contact with the wall surface of the mold is cooled and solidified. The hard material 11 is still being injected under pressure.

そのため、スライドコアー３を開けると第３図。Therefore, when slide core 3 is opened, Figure 3 is shown.

第４図に示すごとく、軟質材１２の先端部が破られて硬
質材が空洞部２６内に流入する。なお、このとき破られ
た軟質材の若干量が硬質材と共に空洞部内に入る。それ
故、中子ピン３１の回りの空洞部２６内は、若干の軟質
材が含有されているか実質的に硬質材１１により占めら
れる。As shown in FIG. 4, the tip of the soft material 12 is broken and the hard material flows into the cavity 26. Note that at this time, a small amount of the torn soft material enters the cavity together with the hard material. Therefore, the inside of the cavity 26 around the core pin 31 may contain some soft material or be substantially occupied by the hard material 11.

その後、キャビティ２５．空洞部２６内の樹脂は冷却固
化させる。そして９分割型を開けて、前記したマッドガ
ード７を取り出す。Then the cavity 25. The resin in the cavity 26 is cooled and solidified. Then, open the nine-part mold and take out the mudguard 7 described above.

上記のごとく　本例によれば、スライドコアー３を設け
、これを操作することによって、取付部分７３の貫通孔
７４の周囲を硬質材１１のみで構成し２本体７１及び下
片７２の一部をサンドイッチ構造とするマッドガード７
を得ることができる。As described above, according to the present example, by providing the slide core 3 and operating it, the periphery of the through hole 74 of the mounting portion 73 is made of only the hard material 11, and a part of the two main bodies 71 and the lower piece 72 is formed. Sandwich structure mudguard 7
can be obtained.

第２実施例 本例は、第８図に示すごとく、スライドコアー３と空洞
部２６との構成が異なる外は、第１実施例と同様とした
ものである。Second Embodiment As shown in FIG. 8, this embodiment is the same as the first embodiment except that the structure of the slide core 3 and the cavity 26 is different.

即ち１本例においては、スライドコアー３は。That is, in one example, the slide core 3 is.

本体３６と中子ピン３５とよりなる。中子ピン３５は空
洞部２６内において１分割型２３に垂下した状態でネジ
込み固定する。また、本体３６は上記中子ピン３５を挿
入できるピン孔３６１を有する。それ故、空洞部２６内
を遮閉する際には、スライドコアー３の本体３６を上昇
させ、そのピン孔３６１内に中子ピン３５を挿入した状
態にしておく、そして、空洞部２６内を開けるときには
。It consists of a main body 36 and a core pin 35. The core pin 35 is screwed and fixed in a suspended state to the one-piece mold 23 within the cavity 26. The main body 36 also has a pin hole 361 into which the core pin 35 can be inserted. Therefore, when closing the inside of the cavity 26, the main body 36 of the slide core 3 is raised, the core pin 35 is inserted into the pin hole 361, and the inside of the cavity 26 is closed. when you open it.

制御棒３２を引き、本体３６を下降させる。これにより
、中子ピン３５のみが空洞部内に位置することとなる。The control rod 32 is pulled to lower the main body 36. As a result, only the core pin 35 is located within the cavity.

また１本例においては、空洞部２６は、第１実施例に比
して前方まで設け、スライドコアーの本体３６を上昇さ
せたときにも、まだその前方（同図の右方）に空洞部が
形成されるよう構成しである０本例の場合は、第１実施
例に比して貫通孔のより前方位置に取付部分の先端が形
成されることとなる。In addition, in this example, the cavity 26 is provided to the front compared to the first embodiment, and even when the main body 36 of the slide core is raised, the cavity still remains in the front (to the right in the figure). In the case of this embodiment, which is configured so that a is formed, the tip of the attachment portion is formed at a position further forward of the through hole compared to the first embodiment.

その他軟質材１２．硬質材１１の射出、注入。Other soft materials 12. Injection and injection of hard material 11.

スライドコアーの操作等の作用効果は、第１実施例と同
様である。The operation and effects of the slide core are the same as in the first embodiment.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図〜第７図は第１実施例にかかるマッドガードを示
し、第１図〜第３図はその成形過程を示す図、第４図は
第３図におけるスライドコア一部分の拡大断面図、第５
図はスライドコアーの斜視図、第６図はマッドガードの
断面図、第７図は第６図のＡ−Ａ矢視断面図、第８図は
第２実施例におけるスライドコア一部分の拡大断面図、
第９図は従来のマッドガードの断面図、第１０図は従来
の成形法を示す説明図である。 １・・・硬質材、　　　１２・・・軟質材２３０．成形
型。 １　２２．２３．、、分割型。 ５１１．キャビティ、２６．、、空洞部。 ３２１．スライドコアー １　３５、、、中子ピン。 ７・・・マッドガード。 ３９０．取付部分、　　７４．、、貫通孔。1 to 7 show the mudguard according to the first embodiment, FIGS. 1 to 3 are views showing the molding process, and FIG. 4 is an enlarged sectional view of a portion of the slide core in FIG. 5
The figure is a perspective view of the slide core, FIG. 6 is a sectional view of the mudguard, FIG. 7 is a sectional view taken along the line A-A in FIG. 6, and FIG. 8 is an enlarged sectional view of a portion of the slide core in the second embodiment.
FIG. 9 is a sectional view of a conventional mudguard, and FIG. 10 is an explanatory diagram showing a conventional molding method. 1...Hard material, 12...Soft material 230. Molding mold. 1 22.23. ,,divided type. 511. Cavity, 26. ,, cavity. 321. Slide core 1 35, core pin. 7...Mudguard. 390. Mounting part, 74. ,,Through hole.

Claims (1)

【特許請求の範囲】 本体と、締付け用の貫通孔を有する取付部分とからなり
、上記本体は硬質材からなるコア層と該コア層の表面に
被覆した軟質材からなる表皮層とにより構成され、一方
取付部分は実質的に硬質材のみからなるプラスチック成
形品をサンドイッチ成形するに当り、 成形品の形状を有するキャビティ内に前記取付部分を成
形するための空洞部を連設すると共に、該空洞部内には
該空洞部内の途中を遮閉できるスライドコアーを設け、
また該スライドコアーには貫通孔形成用の中子ピンを設
けた成形型を用い、上記スライドコアーを閉止した状態
において上記キャビティ内に前記軟質材を射出し、その
後該軟質材の中に硬質材を注入し、キャビティ内への注
入がほぼ完了して内圧が上昇する時点において、前記中
子ピンを空洞部内に残した状態で前記スライドコアーを
開き、該スライドコアーに接している表皮を硬質材によ
って破らせて該硬質材を上記空洞部内前方まで流入させ
ることを特徴とする貫通孔を有するプラスチック成形品
の成形方法。[Claims] Consisting of a main body and a mounting portion having a through hole for tightening, the main body is composed of a core layer made of a hard material and a skin layer made of a soft material coated on the surface of the core layer. On the other hand, when sandwich-molding a plastic molded product in which the mounting portion is made of substantially only hard material, a cavity for molding the mounting portion is provided in a cavity having the shape of the molded product, and the cavity is A slide core is provided inside the cavity that can close off the middle of the cavity,
Further, using a mold provided with a core pin for forming a through hole in the slide core, the soft material is injected into the cavity with the slide core closed, and then a hard material is injected into the soft material. When the injection into the cavity is almost completed and the internal pressure has increased, the slide core is opened with the core pin remaining in the cavity, and the skin in contact with the slide core is covered with a hard material. A method for molding a plastic molded article having a through hole, characterized in that the hard material is broken by a hole and the hard material is allowed to flow into the front of the cavity.
JP2624289A 1989-02-03 1989-02-03 Plastic molding method Expired - Fee Related JP2622876B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2624289A JP2622876B2 (en) 1989-02-03 1989-02-03 Plastic molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2624289A JP2622876B2 (en) 1989-02-03 1989-02-03 Plastic molding method

Publications (2)

Publication Number Publication Date
JPH02206518A true JPH02206518A (en) 1990-08-16
JP2622876B2 JP2622876B2 (en) 1997-06-25

Family

ID=12187834

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2624289A Expired - Fee Related JP2622876B2 (en) 1989-02-03 1989-02-03 Plastic molding method

Country Status (1)

Country Link
JP (1) JP2622876B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04263914A (en) * 1991-02-18 1992-09-18 Toyoda Gosei Co Ltd Molding method of mudguard
JPH0655575A (en) * 1992-08-07 1994-03-01 Inoac Corp Manufacture for automobile mud guard
EP0949053A1 (en) * 1998-04-07 1999-10-13 COMMER S.p.A. Process and device for coinjection of multilayer products
EP1263574B1 (en) * 2000-02-24 2016-05-18 Conix Corporation Method of making integrated co-injection molded vehicle components
CN112388908A (en) * 2020-10-19 2021-02-23 宁波方正汽车模具股份有限公司 Double-color mold short-knife-edge injection molding structure

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04263914A (en) * 1991-02-18 1992-09-18 Toyoda Gosei Co Ltd Molding method of mudguard
JPH0655575A (en) * 1992-08-07 1994-03-01 Inoac Corp Manufacture for automobile mud guard
EP0949053A1 (en) * 1998-04-07 1999-10-13 COMMER S.p.A. Process and device for coinjection of multilayer products
WO1999051416A1 (en) * 1998-04-07 1999-10-14 Johnson Control S.P.A. Process and device for co-injection molding multilayer products
US6475413B1 (en) 1998-04-07 2002-11-05 Johnson Control S.P.A. Process and device for co-injection molding multilayer products
EP1263574B1 (en) * 2000-02-24 2016-05-18 Conix Corporation Method of making integrated co-injection molded vehicle components
CN112388908A (en) * 2020-10-19 2021-02-23 宁波方正汽车模具股份有限公司 Double-color mold short-knife-edge injection molding structure

Also Published As

Publication number Publication date
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