JPH03281319A - Manufacture of mudguard - Google Patents
Manufacture of mudguardInfo
- Publication number
- JPH03281319A JPH03281319A JP8534690A JP8534690A JPH03281319A JP H03281319 A JPH03281319 A JP H03281319A JP 8534690 A JP8534690 A JP 8534690A JP 8534690 A JP8534690 A JP 8534690A JP H03281319 A JPH03281319 A JP H03281319A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cavity
- resin
- mudguard
- hard
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 32
- 239000011347 resin Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 102100037047 Fucose-1-phosphate guanylyltransferase Human genes 0.000 description 1
- 101001029296 Homo sapiens Fucose-1-phosphate guanylyltransferase Proteins 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- JMVSBFJBMXQNJW-GIXZANJISA-N all-trans-pentaprenyl diphosphate Chemical compound CC(C)=CCC\C(C)=C\CC\C(C)=C\CC\C(C)=C\CC\C(C)=C\COP(O)(=O)OP(O)(O)=O JMVSBFJBMXQNJW-GIXZANJISA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Landscapes
- Body Structure For Vehicles (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は自動車のタイヤ後方に取り付けられるマッド
ガードの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method of manufacturing a mudguard that is attached to the rear of an automobile tire.
従来の技術
一般にマッドガード２０は、第７図〜第８図に示すよう
に、ボディ取付部２１及びボディ当り部２２とからなる
ボディ２３に取り付けるための上半部２４と、飛び石等
がボディ２３に当たるのを防止するスカート部２５とか
らなり、樹脂材料を射出成形することにより所望形状に
形成されている。そして、ボディ取付ｆｆ１２１とボデ
ィ当り部２２には、その強度を向上するため、金属製の
インサート（図示せず）を埋め込んでいた。しかしなが
ら、この種のマッドガード２０は、金属製インサートの
錆の発生や、金属製インサートによる重量増等の種々の
問題点を有していた。そこで、金属製インサートを使用
せず、強度を要する部位を硬質樹脂で形成し、強度を要
しない他の部位を軟質樹脂で形成する、軽量のマッドガ
ード及びその製法が案出されている（例えば、特開平ｌ
−２３３１７８号公報参照）。BACKGROUND OF THE INVENTION Generally, as shown in FIGS. 7 and 8, a mudguard 20 includes an upper half portion 24 for attaching to a body 23, which is composed of a body attachment portion 21 and a body abutment portion 22, and a body 23 that is attached to the body 23 by a flying stone or the like. It is formed into a desired shape by injection molding a resin material. Metal inserts (not shown) were embedded in the body attachment ff121 and the body contact portion 22 in order to improve their strength. However, this type of mudguard 20 has had various problems, such as occurrence of rust on the metal insert and increased weight due to the metal insert. Therefore, lightweight mudguards and their manufacturing methods have been devised that do not use metal inserts, but instead form parts that require strength with hard resin and other parts that do not require strength with soft resin (for example, Unexamined patent application
(Refer to Publication No.-233178).
発明が解決しようとする課題
この従来例は、第９図〜第１θ図に示すように、厚みの
大きな上半部形成用キャビティ２６と厚みの小さなスカ
ートａ形成用キャビティ２７内に、射出口２８を介して
軟質樹脂２９を射出し、この軟質樹脂２９の射出完了後
、又は射出しつつ射出口２８から硬質樹脂３０を射出し
て、マッドガード２０を製造するものである。しかしな
がら、軟質樹脂２９と硬質樹脂３０は、射出条件の変動
に伴いその流れが変動するため、キャビティ２６゜２７
内の所望部位に軟質樹脂２９又は硬質樹脂３０が流れ込
めず、製品品質にばらつきを生じる場合があった。Problems to be Solved by the Invention In this conventional example, as shown in FIG. 9 to FIG. The mudguard 20 is manufactured by injecting the soft resin 29 through the injection port 28 and then injecting the hard resin 30 from the injection port 28 after or while the injection of the soft resin 29 is completed. However, the flow of the soft resin 29 and the hard resin 30 fluctuates as the injection conditions change.
In some cases, the soft resin 29 or the hard resin 30 cannot flow into a desired part of the container, resulting in variations in product quality.
そこで、本発明は、このような不具合を解消し得るマッ
ドガードの製造方法の提供を目的とするものである。Therefore, an object of the present invention is to provide a method for manufacturing a mudguard that can eliminate such problems.
課題を解決するための手段
即ち本発明は、硬質部用キャビティを備えた金型内に硬
質樹脂を射出した後、その金型の少なくとも一部を取り
替えて所望製品形状キャビティを形成し、次いでこのキ
ャビティ内に軟質樹脂を射出することを特徴としている
。Means for solving the problem, that is, the present invention, is to inject a hard resin into a mold having a cavity for a hard part, and then replace at least a part of the mold to form a cavity in the desired product shape. It is characterized by injecting soft resin into the cavity.
実施例 以下本発明の実施例を図面に基づき詳述する。Example Embodiments of the present invention will be described in detail below based on the drawings.
第１図はマッドガードの硬質部用キャビティ１を備えた
金型２の断面図を示すものである。この金型２は、第１
金型３．第２金型４及び第３金型５に３分割してあり、
硬質部用キャビティｌが図外のランチに連通されるよう
に戸っている。そして、まず、この金型２の硬質部用キ
ャビティｌ内に、射出ンリンダ（図示せず）から図外の
ランチを介して熱可塑性硬質樹脂（例えば、グラファイ
ト入りポリプロピレン（ＧＦＰＰ）、グラファイト入り
ナイロン（ＧＦＰＡ）、カーボンファイバーナイロノ（
ＣＦＰＡ）等）を射出する。FIG. 1 shows a sectional view of a mold 2 provided with a cavity 1 for the hard part of the mudguard. This mold 2 is the first
Mold 3. It is divided into three parts, a second mold 4 and a third mold 5.
The cavity l for the hard part is opened so as to be communicated with a launch (not shown). First, a hard thermoplastic resin (e.g., graphite-containing polypropylene (GFPP), graphite-containing nylon) ( GFPA), carbon fiber nylon (
CFPA) etc.).
次に、第２図に示すように、熱可塑性硬質樹脂６の射出
完了後、第１金型３を別の第１金型７に取り替える。こ
の第１金型７には、軟質部用キャビティ８を形成してあ
り、この第１金型７を他の第２金型４及び第３金型５に
組み付けることにより、所望の製品形状キャビティ９か
形成されるようになっている。尚、この第１金型７の交
換時、硬質部ＩＯは第２金型４及び第３金型５に保持さ
れている。Next, as shown in FIG. 2, after the injection of the thermoplastic hard resin 6 is completed, the first mold 3 is replaced with another first mold 7. A cavity 8 for a soft part is formed in this first mold 7, and by assembling this first mold 7 to another second mold 4 and third mold 5, a desired product shape cavity can be formed. 9 is formed. Note that when the first mold 7 is replaced, the hard part IO is held in the second mold 4 and the third mold 5.
次いで、第１金型７．第２金型４及び第３金型５の型締
め後、第３図に示すように、製品形状キャビティ９（軟
質部用キャビティ８）内に熱可塑性軟質樹脂１１（例え
ば、オレフィン系、スチレン系又はウレタン系の樹脂材
料）を射出する。Next, the first mold 7. After clamping the second mold 4 and the third mold 5, as shown in FIG. 3, a thermoplastic soft resin 11 (for example, olefin, styrene, or urethane-based resin material).
これによって、第５図〜第６図に示すマッドガードＩ２
を形成することができる。尚、これらの図において、マ
ッドガード１２のボディ取付部１３及びボディ当り部１
４の内周部分が硬質部１０であり、ボディ取付部１３と
ボディ当り部１４の外周部分及びスカート部１５が軟質
部１６である。As a result, the mudguard I2 shown in FIGS.
can be formed. In addition, in these figures, the body attachment part 13 and the body contact part 1 of the mudguard 12 are shown.
The inner periphery of 4 is the hard part 10, and the outer periphery of the body attachment part 13, the body contact part 14, and the skirt part 15 are the soft part 16.
このように本実施例の製造方法によれば、射出条件等に
変動を生しても、マッドガード１２の硬質部１０と軟質
部１６を所望部位に確実に形成することができ、マッド
ガート１２の製品品質にばらつきを生じることかない。As described above, according to the manufacturing method of this embodiment, even if the injection conditions etc. vary, the hard part 10 and the soft part 16 of the mud guard 12 can be reliably formed at desired locations, and the product of the mud guard 12 can be There will be no variation in quality.
尚、以上の実施例は第１金型３のみ別の第１金型７に取
り替える態様を示したが、第４図に示すように、第２金
型４も別の第２金型１７に取り替えれば、硬質部ｌＯの
内周面にも軟質１１！Ｅ１６を形成することができる。In addition, although the above embodiment has shown an aspect in which only the first mold 3 is replaced with another first mold 7, as shown in FIG. 4, the second mold 4 is also replaced with another second mold 17. If you replace it, the inner peripheral surface of the hard part 1O will also have a soft 11! E16 can be formed.
発明の詳細
な説明したように本発明は、硬質樹脂製の硬質部と軟質
樹脂製の軟質部とからマッドガードの製造方法であって
、上記硬質部用キャビティを備えた金型内に硬質樹脂を
射出した後、その金型の少なくとし一部を取り替えて所
望製品形状キャビティを形成し、次いでこのキャビティ
内に軟質樹脂を射出するため、マッドガートの所望部位
を硬質部又は軟質部に確実に形成することができ、マッ
ドガートの製品品質を格段に向上することができる。DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention is a method for manufacturing a mudguard from a hard part made of a hard resin and a soft part made of a soft resin, the hard resin being placed in a mold having a cavity for the hard part. After injection, at least a portion of the mold is replaced to form a cavity in the desired product shape, and then the soft resin is injected into this cavity, so the desired part of the mud guard is reliably formed in the hard part or the soft part. It is possible to significantly improve the product quality of mudguards.
第１図は本発明の一実施例を小ず金型の断面図、第２図
は第１１８１Ｊの金型の一部を取り替えた場合の断面図
、第３図は第２図の金型の軟質樹脂射出後の状態図、第
４図は本発明の他の実施例を示す金型の断面図、第５図
は本発明により製造されたマッドガートの斜視図、第６
図は第５図の１−１線に沿う断面図、第７図は従来例を
示すマッドガードの斜視図、第８図は自動車の後部斜視
図、第９図は従来例を示す射出成形装置の断面図、第１
０図は同金型の断面図である。
１・・・硬質部用キャビティ、２・・・金型、６・・・
硬質樹脂、９・・・製品形状キャビティ、ｌＯ・・・硬
質部、１１・・・軟質樹脂、１２・・・マッドガード、
Ｉ６・・・軟質部。
１２−−−マーシト刀゛−ド
第
図
第
図
第
広ｊ
第
０
図Fig. 1 is a cross-sectional view of a small mold according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the mold of No. 1181J when a part of it is replaced, and Fig. 3 is a cross-sectional view of the mold of Fig. 2. FIG. 4 is a cross-sectional view of a mold showing another embodiment of the present invention; FIG. 5 is a perspective view of a mud guard manufactured according to the present invention; FIG. 6 is a state diagram after soft resin injection.
The figure is a sectional view taken along the line 1-1 in Fig. 5, Fig. 7 is a perspective view of a mudguard showing a conventional example, Fig. 8 is a rear perspective view of an automobile, and Fig. 9 is an injection molding apparatus showing a conventional example. Cross section, 1st
Figure 0 is a cross-sectional view of the same mold. 1... Cavity for hard part, 2... Mold, 6...
Hard resin, 9... Product shape cavity, lO... Hard part, 11... Soft resin, 12... Mud guard,
I6... Soft part. 12--Marsito sword diagram diagram diagram wide j diagram 0
Claims (1)
なるマッドガードの製造方法において、前記硬質部用キ
ャビティを備えた金型内に硬質樹脂を射出した後、その
金型の少なくとも一部を取り替えて所望製品形状キャビ
ティを形成し、次いでこのキャビティ内に軟質樹脂を射
出することを特徴とするマッドガードの製造方法。(1) In the method for manufacturing a mudguard comprising a hard part made of a hard resin and a soft part made of a soft resin, after injecting the hard resin into a mold having a cavity for the hard part, at least one part of the mold is A method for manufacturing a mudguard, which comprises replacing parts to form a cavity in a desired product shape, and then injecting a soft resin into the cavity.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8534690A JPH03281319A (en) | 1990-03-30 | 1990-03-30 | Manufacture of mudguard |
| DE1991614559 DE69114559T2 (en) | 1990-03-30 | 1991-04-02 | Process for making a fender. |
| EP19910302849 EP0449666B1 (en) | 1990-03-30 | 1991-04-02 | Method for forming mud guard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8534690A JPH03281319A (en) | 1990-03-30 | 1990-03-30 | Manufacture of mudguard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03281319A true JPH03281319A (en) | 1991-12-12 |
Family
ID=13856110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8534690A Pending JPH03281319A (en) | 1990-03-30 | 1990-03-30 | Manufacture of mudguard |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03281319A (en) |
-
1990
- 1990-03-30 JP JP8534690A patent/JPH03281319A/en active Pending
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