JPH07164466A - Molding method for bumper facia - Google Patents
Molding method for bumper faciaInfo
- Publication number
- JPH07164466A JPH07164466A JP31238893A JP31238893A JPH07164466A JP H07164466 A JPH07164466 A JP H07164466A JP 31238893 A JP31238893 A JP 31238893A JP 31238893 A JP31238893 A JP 31238893A JP H07164466 A JPH07164466 A JP H07164466A
- Authority
- JP
- Japan
- Prior art keywords
- grill
- thick
- bumper fascia
- resin material
- bumper
- 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
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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3044—Bumpers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車用バンパーのバ
ンパーフェイシアを樹脂射出成形法によって成形する方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a bumper fascia of an automobile bumper by a resin injection molding method.
【０００２】[0002]
【従来の技術】自動車用バンパーのバンパーフェイシア
を射出成形法によって成形することは、例えば実開昭６
３−４３７１１号公報に示されているように広く知られ
ている。2. Description of the Related Art Molding the bumper fascia of a bumper for an automobile by an injection molding method is disclosed in, for example, Shokai Sho 6
It is widely known as disclosed in Japanese Patent Publication No. 3-43711.
【０００３】その一方、図２，３に示すように、バンパ
ーフェイシア１の上面部１ａの中央部に、横フレーム３
とその両端の縦フレーム４，５とでグリル開口部６を形
成するようにグリル２を一体に形成したものがあり、こ
のような構造のバンパーフェイシア１をガスインジェク
ション法を併用した中空射出成形法によって成形するこ
とが本出願人により試られている。On the other hand, as shown in FIGS. 2 and 3, the horizontal frame 3 is provided at the center of the upper surface 1a of the bumper fascia 1.
There is one in which the grill 2 is integrally formed so as to form the grill opening 6 by the vertical frames 4 and 5 at both ends thereof. The bumper fascia 1 having such a structure is used in a hollow injection molding method in combination with a gas injection method. It has been tried by the present applicant to mold by.
【０００４】この方法は、前記横フレーム３のエッジ部
に相当する部分にファンゲート７を設定しておき、バン
パーフェイシア１の上面部１ａのエッジ部裏面側に相当
する部分にその全長にわたって略断面矩形状の厚肉部８
を形成するとともに、キャビティに対する樹脂材料の射
出完了直後に予めキャビティに臨ませたガスノズル９か
ら窒素ガスに代表されるような不活性ガスを導入するこ
とにより、厚肉部８の内部にその長手方向に沿って中空
部１０を形成するようにしたものである。In this method, a fan gate 7 is set in a portion corresponding to an edge portion of the horizontal frame 3, and a portion corresponding to a rear surface side of an edge portion of the upper surface 1a of the bumper fascia 1 is substantially cross-sectioned over its entire length. Rectangular thick part 8
Is formed, and immediately after the injection of the resin material into the cavity is completed, an inert gas represented by nitrogen gas is introduced from the gas nozzle 9 facing the cavity in advance, so that the thick portion 8 is longitudinally guided in the longitudinal direction thereof. The hollow portion 10 is formed along the above.
【０００５】すなわち、厚肉部８に導入されたガスは樹
脂材料に内圧をかけることによりその樹脂材料の流動を
助けると同時に、「ひけ」等の発生を防止し、さらには
厚肉部８内のガス通路（ガス占有空間）がそのまま中空
部１０として残ることにより厚肉部８が中空状の補強リ
ブとして機能することになる。That is, the gas introduced into the thick portion 8 helps the resin material to flow by applying an internal pressure to the resin material, and at the same time prevents the occurrence of "sinks" and the like. By leaving the gas passage (gas occupied space) as it is as the hollow portion 10, the thick portion 8 functions as a hollow reinforcing rib.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、図２の
ほか図４に示すように、グリル２の横フレーム３に相当
する部分にファンゲート７を設定しているため、ファン
ゲート７を通過した樹脂材料は横フレーム３に相当する
部分で二手に分かれた上でそれぞれに縦フレーム４，５
に相当する部分を流れ、最終的にバンパーフェイシア１
自体の長手方向中央部で再び合流するかたちとなる（樹
脂材料の流れを符号Ｆ1，Ｆ2で示す）。However, as shown in FIG. 2 and FIG. 4 as well as FIG. 2, since the fan gate 7 is set in the portion corresponding to the horizontal frame 3 of the grill 2, the resin passing through the fan gate 7 The material is divided into two parts at the part corresponding to the horizontal frame 3, and then the vertical frames 4, 5 respectively.
It flows through the part corresponding to, and finally bumper facia 1
They are merged again at the central portion in the longitudinal direction of themselves (the flow of the resin material is shown by the symbols F 1 and F 2 ).
【０００７】したがって、バンパーフェイシア１の外観
品質上最も重要な正面中央部にウエルドラインＱが発生
しやすくなり、成形品質の上でなおも問題を残してい
る。Therefore, the weld line Q is apt to occur at the center of the front surface, which is the most important in terms of appearance quality of the bumper fascia 1, and there is still a problem in terms of molding quality.
【０００８】本発明は以上のような課題に着目してなさ
れたもので、グリル一体型のバンパーフェイシアの特殊
性としてゲート部を通過した樹脂材料が二手に分かれて
しまう点は容認しつつも、樹脂材料の合流によるウエル
ドラインが目立たないようにした成形方法を提供するこ
とを目的としている。The present invention has been made in view of the above-mentioned problems, and as a peculiarity of the grille-integrated bumper fascia, while accepting that the resin material that has passed through the gate portion is divided into two parts, An object of the present invention is to provide a molding method in which a weld line due to the joining of resin materials is inconspicuous.
【０００９】[0009]
【課題を解決するための手段】本発明は、上面中央部
に、横フレームとその両端の縦フレームとでグリル開口
部を形成するようにしたグリルが一体に形成された自動
車用バンパーのバンパーフェイシアを樹脂射出成形法に
よって成形するにあたり、前記横フレームに相当する部
分にゲート部を設定してこのゲート部からキャビティ内
に樹脂材料を射出するようにしたバンパーフェイシアの
成形方法において、前記バンパーフェイシアの上縁部に
長手方向に沿って厚肉部を形成するとともに、前記グリ
ルの左半部および右半部のいずれか一方を他方よりも厚
肉に形成し、ガスインジェクション法の併用により前記
厚肉部もしくはグリル厚肉部にガスを導入することで、
前記厚肉部の長手方向に沿って伸びる中空部と、該中空
部に連続して前記グリル厚肉部側に伸びるグリル中空部
とを形成することを特徴としている。SUMMARY OF THE INVENTION According to the present invention, a bumper fascia for an automobile bumper integrally formed with a grill having a horizontal frame and vertical frames at both ends thereof is formed in a central portion of an upper surface of the grill. In molding the resin by a resin injection molding method, in a molding method of a bumper fascia in which a gate portion is set in a portion corresponding to the horizontal frame and a resin material is injected from this gate portion into a cavity, While forming a thick portion along the longitudinal direction at the upper edge portion, one of the left half portion and the right half portion of the grill is formed thicker than the other, and the thick portion is formed by using a gas injection method in combination. By introducing gas into the thick section or grill thick section,
It is characterized in that a hollow portion extending along the longitudinal direction of the thick portion and a grill hollow portion extending continuously to the grill thick portion side are formed.
【００１０】[0010]
【作用】この方法によると、ゲート部を通過した樹脂材
料がグリルに相当する部分で二手に分かれてしまうこと
には変わりがないものの、そのグリルの左半部と右半部
とで肉厚を異ならしめたことにより、グリル厚肉部の方
が樹脂材料の流動性がよく、流速が大きくなる。したが
って、上記のグリル厚肉部の肉厚を適宜設定することに
より、一旦は二手に分かれた樹脂材料の流れの合流点す
なわちウエルドラインを、品質上目立ちにくいグリルと
バンパーフェイシアとの接合部に移すことができる。According to this method, although the resin material that has passed through the gate part is divided into two parts at the part corresponding to the grill, there is no difference in thickness between the left half part and the right half part of the grill. By making them different, the thick wall portion of the grill has a better fluidity of the resin material, and the flow velocity becomes higher. Therefore, by appropriately setting the thickness of the thick portion of the grill described above, the once confluent point of the flow of the resin material, that is, the weld line, is moved to the joint between the grill and the bumper fascia, which is inconspicuous in terms of quality. be able to.
【００１１】[0011]
【実施例】図１は本発明の一実施例を示す図で、図２〜
４に示した従来例と共通する部分には同一符号を付して
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of the present invention.
The same parts as those of the conventional example shown in FIG.
【００１２】図１に示すように、横フレーム３とその両
端の一対の縦フレーム４，５とで形成されるグリル２に
ついてその左半部と右半部とで肉厚が異なるように予め
設定し、例えば横フレーム３の左半部とそれに連続する
一方の縦フレーム４の下半部とをそれぞれ裏面側に厚肉
化させてグリル厚肉部１１を形成し、そのグリル厚肉部
１１を他方の縦フレーム５とともにバンパーフェイシア
１自体の厚肉部８に連続させるようにする。As shown in FIG. 1, a grill 2 formed of a horizontal frame 3 and a pair of vertical frames 4 and 5 at both ends thereof is preset so that the left half portion and the right half portion have different wall thicknesses. Then, for example, the left half portion of the horizontal frame 3 and the lower half portion of one of the vertical frames 4 continuous with the left frame portion are thickened on the back surface side to form a thick grill portion 11, and the thick grill portion 11 is formed. Together with the other vertical frame 5, the bumper fascia 1 is made to continue to the thick wall portion 8 itself.
【００１３】このような形状設定とした場合、ファンゲ
ート７からキャビティ内に流入した樹脂材料は、横フレ
ーム３に相当する部分で従来と同様に二手に分かれた上
で左右の縦フレーム４，５に相当する部分に沿って流れ
ることになる。しかしながら、前記グリル２の左半部は
グリル厚肉部１１として形成されていて横フレーム３お
よび縦フレーム４ともにその断面積が右半部よりも大き
いために、左半部であるグリル厚肉部１１の方が樹脂材
料の流動性がよく、流速が大きくなる。In the case of such a shape setting, the resin material flowing into the cavity from the fan gate 7 is divided into two parts in a portion corresponding to the horizontal frame 3 as in the conventional case, and then the left and right vertical frames 4, 5 are formed. It will flow along the part corresponding to. However, since the left half portion of the grill 2 is formed as the thick grill portion 11 and the cross-sectional areas of both the horizontal frame 3 and the vertical frame 4 are larger than the right half portion, the thick left portion is the thick grill portion. In No. 11, the fluidity of the resin material is better and the flow velocity is higher.
【００１４】その結果、グリル厚肉部１１を通過した樹
脂材料はバンパーフェイシア１の厚肉部８側に流れ込
み、縦フレーム５の根元部において、グリル厚肉部１１
を通過した樹脂材料とグリル２の右半部を通過した樹脂
材料とが初めて合流するかたちとなる。なお、図１の
（Ａ）において、グリル厚肉部１１を通過した樹脂材料
の流れを符号Ｆ1で示すとともに、グリル２の右半部を
通過した樹脂材料の流れを符号Ｆ2で示す。As a result, the resin material that has passed through the thick grill portion 11 flows into the thick portion 8 side of the bumper fascia 1, and at the root portion of the vertical frame 5, the thick grill portion 11 is formed.
The resin material that has passed through and the resin material that has passed through the right half of the grill 2 merge for the first time. In FIG. 1A, the flow of the resin material passing through the thick grill portion 11 is indicated by reference sign F 1 , and the flow of the resin material passing through the right half portion of the grill 2 is indicated by reference sign F 2 .
【００１５】すなわち、樹脂材料の合流位置が縦フレー
ム５の根元部となることによって、仮にその合流に伴っ
てウエルドラインＱが発生したとしても外観上特に目立
つことがなくなり、また上記のように合流した後の樹脂
材料がそのまま厚肉部８からその下方に流入することに
より、バンパーフェイシア１の前面中央部にはウエルド
ラインが発生することはない。That is, since the merging position of the resin material is at the root of the vertical frame 5, even if the weld line Q is generated due to the merging, it is not particularly noticeable in appearance, and as described above, the merging is performed. Since the resin material after that has flowed from the thick portion 8 to the lower portion as it is, no weld line is generated in the central portion of the front surface of the bumper fascia 1.
【００１６】樹脂材料の射出完了直後に、従来と同様に
図１に示したガスノズル９から不活性ガスを導入する。
この不活性ガスの導入により、厚肉部８の全長に沿って
中空部１０が形成されることはもちろんのこと、その厚
肉部８に連続しているグリル厚肉部１１にも不活性ガス
が流入してグリル中空部１２が形成される。Immediately after the injection of the resin material is completed, an inert gas is introduced from the gas nozzle 9 shown in FIG.
By introducing this inert gas, not only the hollow portion 10 is formed along the entire length of the thick portion 8, but also the grill thick portion 11 continuous to the thick portion 8 is provided with the inert gas. Flows in to form the grill hollow portion 12.
【００１７】なお、上記実施例では、ファンゲート７を
採用した場合の例を示したが、該ファンゲート７と同様
の偏平幅広のフィルトゲートを用いてもよい。また、上
記のようにグリル２の左半部と右半部とで肉厚を異なら
しめることにより、グリル２の裏面側には段差が生じる
ことになるが、成形品の機能の上で特に問題となること
はない。In the above embodiment, the example in which the fan gate 7 is adopted has been described, but a flat wide gate similar to the fan gate 7 may be used. Further, as described above, since the thickness of the left half portion and the right half portion of the grill 2 are made different, a step is formed on the rear surface side of the grill 2, which is a particular problem in terms of the function of the molded product. It never becomes.
【００１８】[0018]
【発明の効果】以上のように本発明によれば、グリルの
左半部と右半部とで肉厚を異ならしめて一方をグリル厚
肉部として形成して、その左半部と右半部とで樹脂の流
速を変えるようにしたことにより、グリルの横フレーム
に相当する部分で二手に分かれることとなる樹脂材料の
流れの合流位置を縦フレームの根元部とすることができ
る。したがって、樹脂材料の合流位置では不可避とされ
るウエルドラインが発生したとしても、その発生位置が
縦フレームの根元部であるために外観上特に目立つこと
がなくなり、バンパーフェイシアの外観品質の向上に貢
献できる。As described above, according to the present invention, the left half portion and the right half portion of the grill have different wall thicknesses, and one of them is formed as a thick grill portion, and the left half portion and the right half portion thereof are formed. By changing the flow velocity of the resin with and, the confluent position of the flow of the resin material, which is divided into two parts at the portion corresponding to the horizontal frame of the grill, can be the root portion of the vertical frame. Therefore, even if a weld line, which is unavoidable at the confluence position of the resin material, occurs at the root of the vertical frame, it is not particularly noticeable in appearance and contributes to the improvement of the appearance quality of the bumper fascia. it can.
【図１】本発明の一実施例を示す図で、（Ａ）はバンパ
ーフェイシアの要部拡大図、（Ｂ）は同図（Ａ）のｂ−
ｂ線に沿う断面図、（Ｃ）は同図（Ａ）のｃ−ｃ線に沿
う断面図。1A and 1B are views showing an embodiment of the present invention, in which FIG. 1A is an enlarged view of a main part of a bumper fascia, and FIG.
Sectional drawing which follows the b line, (C) is sectional drawing which follows the cc line of the same figure (A).
【図２】従来の成形法により成形されたバンパーフェイ
シアの斜視図。FIG. 2 is a perspective view of a bumper fascia molded by a conventional molding method.
【図３】図２のａ−ａ線に沿う断面図。FIG. 3 is a sectional view taken along line aa of FIG.
【図４】図２の要部の正面説明図。FIG. 4 is a front explanatory view of the main part of FIG.
１…バンパーフェイシア １ａ…上面部 ２…グリル ３…横フレーム ４，５…縦フレーム ６…グリル開口部 ７…ファンゲート ８…厚肉部 １０…中空部 １１…グリル厚肉部 １２…グリル中空部 Ｑ…ウエルドライン 1 ... Bumper fascia 1a ... Top part 2 ... Grill 3 ... Horizontal frame 4, 5 ... Vertical frame 6 ... Grill opening 7 ... Fan gate 8 ... Thick part 10 ... Hollow part 11 ... Grill thick part 12 ... Grill hollow part Q: Weld line
Claims (1)
縦フレームとでグリル開口部を形成するようにしたグリ
ルが一体に形成された自動車用バンパーのバンパーフェ
イシアを樹脂射出成形法によって成形するにあたり、前
記横フレームに相当する部分にゲート部を設定してこの
ゲート部からキャビティ内に樹脂材料を射出するように
したバンパーフェイシアの成形方法において、 前記バンパーフェイシアの上縁部に長手方向に沿って厚
肉部を形成するとともに、前記グリルの左半部および右
半部のいずれか一方を他方よりも厚肉に形成し、 ガスインジェクション法の併用により前記厚肉部もしく
はグリル厚肉部にガスを導入することで、前記厚肉部の
長手方向に沿って伸びる中空部と、該中空部に連続して
前記グリル厚肉部側に伸びるグリル中空部とを形成する
ことを特徴とするバンパーフェイシアの成形方法。1. A bumper fascia of a bumper for an automobile, in which a grill having a horizontal frame and vertical frames at both ends thereof is integrally formed in a central portion of an upper surface, is molded by a resin injection molding method. In the method of molding a bumper fascia in which a gate portion is set in a portion corresponding to the lateral frame and a resin material is injected into the cavity from the gate portion, a bumper fascia is formed along a longitudinal direction along an upper edge portion of the bumper fascia. To form a thick wall portion, and one of the left half portion and the right half portion of the grill is formed thicker than the other, and gas is injected into the thick portion or the grill thick portion by the combined use of the gas injection method. By introducing a hollow portion extending along the longitudinal direction of the thick portion, and a grease extending continuously to the hollow portion toward the thick portion of the grill. Molding process of the bumper fascia, characterized by forming the hollow portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31238893A JPH07164466A (en) | 1993-12-14 | 1993-12-14 | Molding method for bumper facia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31238893A JPH07164466A (en) | 1993-12-14 | 1993-12-14 | Molding method for bumper facia |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07164466A true JPH07164466A (en) | 1995-06-27 |
Family
ID=18028655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31238893A Pending JPH07164466A (en) | 1993-12-14 | 1993-12-14 | Molding method for bumper facia |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07164466A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001012411A1 (en) * | 1999-08-16 | 2001-02-22 | Decoma International Corp. | Method for forming a fascia assembly for a motor vehicle |
| US6872345B1 (en) | 1999-08-16 | 2005-03-29 | Decoma International Inc. | Method for forming a fascia assembly for a motor vehicle |
-
1993
- 1993-12-14 JP JP31238893A patent/JPH07164466A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001012411A1 (en) * | 1999-08-16 | 2001-02-22 | Decoma International Corp. | Method for forming a fascia assembly for a motor vehicle |
| US6872345B1 (en) | 1999-08-16 | 2005-03-29 | Decoma International Inc. | Method for forming a fascia assembly for a motor vehicle |
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