JPH0825516A - Manufacture of door mirror body - Google Patents
Manufacture of door mirror bodyInfo
- Publication number
- JPH0825516A JPH0825516A JP18533294A JP18533294A JPH0825516A JP H0825516 A JPH0825516 A JP H0825516A JP 18533294 A JP18533294 A JP 18533294A JP 18533294 A JP18533294 A JP 18533294A JP H0825516 A JPH0825516 A JP H0825516A
- Authority
- JP
- Japan
- Prior art keywords
- mirror body
- resin
- door mirror
- gas
- cavity
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車のドアミラーボ
ディの製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an automobile door mirror body.
【０００２】[0002]
【従来の技術】自動車フロントドアに固定されるドアミ
ラーボディは、例えば図４に示す構造を有する。図示の
ドアミラーボディ１は、車体後方に向かって開口部２が
形成され、かつこの開口部２端縁には、補強のため肉厚
部３が形成される。かかるドアミラーボディ１内にミラ
ー及びこのミラーを傾動駆動する駆動装置が収納され
る。ドアミラーボディ１は、ＡＢＳ樹脂等により射出形
成法にて中実状態に形成される。かかる構造のドアミラ
ーボディ１は、例えば、特公平４─７６８１４号公報に
記載されている。2. Description of the Related Art A door mirror body fixed to a front door of an automobile has, for example, a structure shown in FIG. In the illustrated door mirror body 1, an opening 2 is formed toward the rear of the vehicle body, and a thick portion 3 is formed at the edge of the opening 2 for reinforcement. A mirror and a drive device for tilting the mirror are housed in the door mirror body 1. The door mirror body 1 is made of ABS resin or the like in a solid state by an injection molding method. The door mirror body 1 having such a structure is described in, for example, Japanese Patent Publication No. 4-76814.
【０００３】また射出成形機により樹脂を金型キャビテ
ィ内に注入した後、樹脂内部に気体を吹き込み、樹脂成
形品内部を中空とする技術も知られている（例えば、特
公昭５７─１４９６８号公報）。There is also known a technique in which a resin is injected into a mold cavity by an injection molding machine and then a gas is blown into the resin to make the inside of the resin molded product hollow (for example, JP-B-57-14968). ).
【０００４】[0004]
【発明が解決しようとする課題】ドアミラーボディは、
自動車フロントドアに外方に向かって突出して固定され
るために、前方或いは後方から障害物が衝突するおそれ
がある。この場合、ドアミラーボディの周囲肉厚部に成
形の際に生じた応力が残っていた場合、僅かな衝撃で破
壊されてしまうことがある。それ故、このドアミラーボ
ディ端縁の肉厚部には残留応力が存在しないことが望ま
しい。The door mirror body is
Since it is fixed to the front door of the automobile by projecting outward, an obstacle may collide from the front or the rear. In this case, if the stress generated during molding remains in the thick wall portion around the door mirror body, it may be destroyed by a slight impact. Therefore, it is desirable that there is no residual stress in the thick portion of the edge of the door mirror body.
【０００５】しかしながら、この種樹脂成形品の製造法
として広く利用されている射出成形法によれば、成形時
樹脂の射出圧力が、約500 〜600kg/cm2 にもなり、成形
品に残留応力が残り易いという問題がある。However, according to the injection molding method which is widely used as a method for producing this kind of resin molded product, the injection pressure of the resin at the time of molding reaches about 500 to 600 kg / cm 2 , and the residual stress on the molded product is increased. There is a problem that it is easy to remain.
【０００６】本発明は、このような問題を解決するため
になされたもので、残留応力の存在しないドアミラーボ
ディを製造することができる製造法を提供するものであ
る。The present invention has been made to solve such a problem, and provides a manufacturing method capable of manufacturing a door mirror body having no residual stress.
【０００７】[0007]
【課題を解決するための手段】本発明は、自動車フロン
トドアに固定され車体後方に向かって開口部を有し、か
つ開口部端縁に肉厚部を形成してなる樹脂製ドアミラー
ボディの製造法であって、該ドアミラーボディの陰形キ
ャビティを有する金型内に加熱溶融した樹脂を注入し、
ドアミラーボディを成形する工程、該樹脂注入後であっ
て上記肉厚部の樹脂が軟化状態にあるとき上記肉厚部内
部に気体を吹き込み上記肉厚部内部に中空部を形成する
と同時に該中空部外周の樹脂を上記金型キャビティ壁面
に向かって加圧する工程、を含むものである。SUMMARY OF THE INVENTION The present invention is directed to the manufacture of a resin door mirror body which is fixed to an automobile front door and has an opening toward the rear of the vehicle body, and a thick portion is formed at the edge of the opening. A method of injecting heat-melted resin into a mold having a negative cavity of the door mirror body,
A step of molding a door mirror body, after the resin is injected and when the resin of the thick portion is in a softened state, gas is blown into the thick portion to form a hollow portion inside the thick portion and at the same time the hollow portion is formed. And a step of pressing the resin on the outer periphery toward the wall surface of the mold cavity.
【０００８】[0008]
【実施例】図１及び図２において、４は、ＡＢＳ樹脂よ
りなるドアミラーボディで、開口部５を有しその端縁に
は、肉厚部６が形成されている。この肉厚部６は、開口
部５の上辺及び外側辺に形成され、最大肉厚部の厚さ
は、約10mm、幅約25mmである。ドアミラーボディ４の肉
厚部６以外の部分の厚さは、約３mmである。図２に破線
で示すように、開口部５には、ミラー７が配置され、ミ
ラー７の背面には、ミラー７を上下方向及び左右方向に
傾斜角度を変える傾動駆動装置８が配置される。この駆
動装置８は、ドアミラーボディ４の内側に形成されたボ
ス９にネジ等により固定される。1 and 2, reference numeral 4 denotes a door mirror body made of ABS resin, which has an opening 5 and a thick portion 6 formed at the edge thereof. The thick portion 6 is formed on the upper side and the outer side of the opening 5, and the maximum thick portion has a thickness of about 10 mm and a width of about 25 mm. The thickness of the portion other than the thick portion 6 of the door mirror body 4 is about 3 mm. As shown by a broken line in FIG. 2, a mirror 7 is arranged in the opening 5, and a tilting drive device 8 for changing the tilt angle of the mirror 7 in the vertical direction and the horizontal direction is arranged on the back surface of the mirror 7. The drive device 8 is fixed to a boss 9 formed inside the door mirror body 4 with screws or the like.
【０００９】１０ａ，１０ｂは、ドアミラーボディ４の
内面に形成された断面半円形の膨出ラインで、気体吹込
口１１から肉厚部６につながる２本の膨出ライン１０
ａ，１０ａと、各ボス９，９，９につながる３本の膨出
ライン１０ｂ，１０ｂ，１０ｂよりなる。各膨出ライン
１０ａ，１０ｂの幅は、約７mm、断面半円径の最大高さ
は、約３mmである。１２は、樹脂が注入された際のゲー
ト部分である。Reference numerals 10a and 10b are bulging lines having a semicircular cross section formed on the inner surface of the door mirror body 4, and two bulging lines 10 connected from the gas inlet 11 to the thick portion 6 are provided.
a, 10a and three bulging lines 10b, 10b, 10b connected to each boss 9, 9, 9. The width of each bulging line 10a, 10b is about 7 mm, and the maximum height of the semicircular cross-section is about 3 mm. Reference numeral 12 is a gate portion when resin is injected.
【００１０】１３は、肉厚部６内に形成された中空部、
１４は、各膨出ライン１０ａ，１０ｂ内に形成された気
体導通路である。この中空部１３及び気体導通路１４
は、気体吹込口１１からの気体吹込みにより形成され
る。Reference numeral 13 denotes a hollow portion formed in the thick portion 6,
Reference numeral 14 is a gas conduction path formed in each of the bulging lines 10a and 10b. The hollow portion 13 and the gas communication path 14
Is formed by blowing gas from the gas blowing port 11.
【００１１】次に図３に基づいて、上記構造のドアミラ
ーボディ４の製造法につき説明する。図中１５は、金型
で、上型１６及び下型１７よりなる。１８は、金型１５
内に形成されたキャビティで、ドアミラーボディ４の陰
形形状に形成されている。１９は、射出成形機（図示せ
ず）のノズルで、上型１６に当接している。ノズル１９
より射出された樹脂は、スプル２０、ゲート２１を介し
てキャビティ１８内に注入される。Next, a method of manufacturing the door mirror body 4 having the above structure will be described with reference to FIG. In the figure, numeral 15 is a mold, which is composed of an upper mold 16 and a lower mold 17. 18 is a mold 15
It is a cavity formed inside and is formed in a negative shape of the door mirror body 4. A nozzle 19 of an injection molding machine (not shown) is in contact with the upper mold 16. Nozzle 19
The resin thus injected is injected into the cavity 18 through the sprue 20 and the gate 21.
【００１２】樹脂注入量は、キャビティ１８の容積及び
後で形成される中空部の容積により決定され、今の場
合、キャビティ１８の容積より僅か少ない容積を満たす
樹脂が注入される。このキャビティの容積と注入樹脂の
量は、形成される中空部の大きさに応じて調整される
が、通常樹脂量がキャビティの容積に略等しいか若しく
は、これより少ない量に設定される。ここで樹脂は、約
240 ℃に加熱され溶融状態にあり、金型１５は、約70℃
に加熱された状態にある。The resin injection amount is determined by the volume of the cavity 18 and the volume of the hollow portion formed later, and in this case, the resin filling a volume slightly smaller than the volume of the cavity 18 is injected. The volume of the cavity and the amount of injected resin are adjusted according to the size of the hollow portion to be formed, but the amount of resin is usually set to be approximately equal to or smaller than the volume of the cavity. Where the resin is about
It is heated to 240 ℃ and is in a molten state.
It is in a heated state.
【００１３】２２は、下型１７に形成された気体吹込口
で、外部より圧搾状態にある気体例えば窒素ガスが吹込
まれる。この気体吹込みは、樹脂注入後、数秒後本実施
例では、３秒後になされる。またこの吹込みによるキャ
ビティ内圧力は、約150kg/cm2 以下と低圧にすることが
できる。Reference numeral 22 is a gas injection port formed in the lower mold 17, through which a compressed gas such as nitrogen gas is blown from the outside. This gas blowing is performed several seconds after the resin is injected, and in this embodiment, 3 seconds later. Further, the pressure in the cavity due to this blowing can be made as low as about 150 kg / cm 2 or less.
【００１４】樹脂注入後、３秒経過したとき、樹脂は、
上下型１６，１７により冷却され、キャビティ１８壁面
に接する樹脂は硬化し樹脂表皮層が形成されている。か
かる状態で気体吹込口２２より高圧気体が吹込まれる
と、樹脂量が多くかつ軟化状態にある膨出ライン１０
ａ，１０ｂの略中央部分に気体導通路１４が形成され
る。２本の気体導通路１４を形成しながら、肉厚部６に
到達した気体は、さらにこの肉厚部６内に中空部１３を
形成し、中空部１３外周の樹脂をキャビティ１８壁面に
向かって加圧する。この気体による樹脂成形品の内部か
らの加圧により、歪みの少ない高い成形精度が得られ
る。When 3 seconds have passed after the resin was injected, the resin was
The resin that is cooled by the upper and lower molds 16 and 17 and is in contact with the wall surface of the cavity 18 is cured to form a resin skin layer. When high-pressure gas is blown from the gas blowing port 22 in such a state, the swelling line 10 having a large amount of resin and being in a softened state
A gas communication path 14 is formed at a substantially central portion of a and 10b. The gas that reaches the thick portion 6 while forming the two gas conducting paths 14 further forms the hollow portion 13 in the thick portion 6, and the resin on the outer periphery of the hollow portion 13 faces the wall surface of the cavity 18. Pressurize. By pressurizing the resin molded product from the inside with this gas, high molding accuracy with less distortion can be obtained.
【００１５】ボス９につながる膨出ライン１０ｂ内にも
同様の気体導通路１４が形成される。この気体導通路１
４を介して、ボス９…の変形、ヒケ等の発生が防止され
る。A similar gas communication path 14 is also formed in the bulging line 10b connected to the boss 9. This gas conduit 1
The deformation of the bosses 9 ...
【００１６】圧搾気体による中空部１３及び気体導通路
１４への加圧は、約40秒間持続され、樹脂成形部の温度
が、約80〜90℃に低下したとき、上下型１６，１７は、
開かれドアミラーボディ４が取り出される。The pressure applied to the hollow portion 13 and the gas conducting passage 14 by the compressed gas is continued for about 40 seconds, and when the temperature of the resin molding portion is lowered to about 80 to 90 ° C., the upper and lower molds 16, 17 are
The door mirror body 4 is opened and taken out.
【００１７】上記実施例においては、ドアミラーボディ
４の端縁肉厚部６にのみ中空部１３を形成した場合につ
き説明したが、補強を要する他の部分であっても、内側
を肉厚に形成し、ここに膨出ラインを形成することによ
り内部に中空部を形成することができる。In the above-described embodiment, the case where the hollow portion 13 is formed only in the thick edge portion 6 of the door mirror body 4 has been described. However, even in the other portions requiring reinforcement, the inside is made thick. However, a hollow portion can be formed inside by forming a bulging line here.
【００１８】[0018]
【発明の効果】本発明によれば、以下の効果が奏せられ
る。イ、樹脂が金型キャビティ内に低圧で注入され、注
入後、樹脂肉厚部に狙いをつけて気体が吹き込まれて中
空部が形成される。この中空部を介して気体により樹脂
成形体に圧力が加えられれて歪みの少ない高精度の成形
体が得られる。それ故樹脂成形体に残留応力が生じるこ
とはなく、中空部を形成したにもかかわらず、この中空
部が形成された肉厚部の強度を上げることが可能とな
り、これに外部衝撃が加わっても容易に破壊されること
はない。これよりドアミラーボディの端縁部の如く外力
が加わり易い部分の成形に適しているということができ
る。ロ、樹脂肉厚部分内に中空部が形成されるから、こ
の肉厚部の冷却が迅速に行われる。これより、成形サイ
クルの短縮化を図ることができる。発明者等の実験によ
ればドアミラーボディの成形の場合、この時間短縮は従
来の50％（成形時間２分を１分に短縮）が可能であっ
た。ハ、肉厚部に中空部が形成されるから、ドアミラー
ボディの重量を減らすことができ、従来の中実構造のも
のに比べて約５〜10％の軽量化が可能である。According to the present invention, the following effects can be obtained. B. Resin is injected into the mold cavity at a low pressure, and after injection, a gas is blown into the thick resin portion to form a hollow portion. Gas is applied to the resin molded body through the hollow portion to obtain a highly accurate molded body with less distortion. Therefore, residual stress does not occur in the resin molded body, and although the hollow portion is formed, it is possible to increase the strength of the thick portion in which the hollow portion is formed, and external impact is applied to this. Is not easily destroyed. From this, it can be said that it is suitable for molding a portion to which an external force is easily applied, such as an edge portion of a door mirror body. (B) Since the hollow portion is formed in the resin thick portion, the thick portion is quickly cooled. As a result, the molding cycle can be shortened. According to the experiments by the inventors, in the case of molding the door mirror body, this time reduction can be made 50% of the conventional time (the molding time is reduced from 2 minutes to 1 minute). (C) Since the hollow portion is formed in the thick portion, the weight of the door mirror body can be reduced, and the weight can be reduced by about 5 to 10% as compared with the conventional solid structure.
【図１】本発明の実施例に係る製造法にて製造されたド
アミラーボディの正面図である。FIG. 1 is a front view of a door mirror body manufactured by a manufacturing method according to an embodiment of the present invention.
【図２】図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図３】実施例に係る製造法を説明するための断面図で
ある。FIG. 3 is a cross-sectional view for explaining the manufacturing method according to the embodiment.
【図４】従来例断面図である。FIG. 4 is a sectional view of a conventional example.
１，４……………ドアミラーボディ ２，５……………開口部 ３，６……………肉厚部 ９…………………ボス １０ａ，１０ｂ…膨出ライン １３………………中空部 １４………………気体導通路 １５………………金型 １６………………上型 １７………………下型 １８………………キャビティ １９………………ノズル 1,4 ……………… Door mirror body 2,5 ……………… Opening 3,6 ……………… Thickness 9 ………………… Boss 10a, 10b… Swelling line 13 …… ………… Hollow part 14 ……………… Gas communication path 15 ……………… Mold 16 ……………… Upper mold 17 ……………… Lower mold 18 ……………… Cavity 19 ……………… Nozzle
Claims (1)
に向かって開口部を有し、かつ開口部端縁に肉厚部を形
成してなる樹脂製ドアミラーボディの製造法であって、
該ドアミラーボディの陰形キャビティを有する金型内に
加熱溶融した樹脂を注入し、ドアミラーボディを成形す
る工程、該樹脂注入後であって上記肉厚部の樹脂が軟化
状態にあるとき上記肉厚部内部に気体を吹き込み上記肉
厚部内部に中空部を形成すると同時に該中空部外周の樹
脂を上記金型キャビティ壁面に向かって加圧する工程、
を含むことを特徴とするドアミラーボディの製造法1. A method of manufacturing a resin door mirror body, which is fixed to a front door of an automobile, has an opening toward the rear of the vehicle body, and has a thick portion at the edge of the opening.
A step of injecting a heated and melted resin into a mold having a negative cavity of the door mirror body to mold the door mirror body, the thickness after the resin is injected and the resin in the thick portion is in a softened state. A step of blowing a gas into the inside of the portion to form a hollow portion inside the thick portion and at the same time pressurizing the resin on the outer periphery of the hollow portion toward the mold cavity wall surface,
A method of manufacturing a door mirror body characterized by containing
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18533294A JPH0825516A (en) | 1994-07-13 | 1994-07-13 | Manufacture of door mirror body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18533294A JPH0825516A (en) | 1994-07-13 | 1994-07-13 | Manufacture of door mirror body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0825516A true JPH0825516A (en) | 1996-01-30 |
Family
ID=16168964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18533294A Pending JPH0825516A (en) | 1994-07-13 | 1994-07-13 | Manufacture of door mirror body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0825516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999010201A1 (en) * | 1997-08-29 | 1999-03-04 | Ut Automotive Dearborn, Inc. | Integral mirror bracket using gas assist molding |
-
1994
- 1994-07-13 JP JP18533294A patent/JPH0825516A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999010201A1 (en) * | 1997-08-29 | 1999-03-04 | Ut Automotive Dearborn, Inc. | Integral mirror bracket using gas assist molding |
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