JPH03286816A - Injection molded body with insert - Google Patents
Injection molded body with insertInfo
- Publication number
- JPH03286816A JPH03286816A JP8826990A JP8826990A JPH03286816A JP H03286816 A JPH03286816 A JP H03286816A JP 8826990 A JP8826990 A JP 8826990A JP 8826990 A JP8826990 A JP 8826990A JP H03286816 A JPH03286816 A JP H03286816A
- Authority
- JP
- Japan
- Prior art keywords
- molded body
- insert
- mold
- body section
- injection molded
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 14
- 239000007924 injection Substances 0.000 title claims abstract description 14
- 238000001816 cooling Methods 0.000 abstract description 7
- 229920005989 resin Polymers 0.000 abstract description 7
- 239000011347 resin Substances 0.000 abstract description 7
- 238000001746 injection moulding Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (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］
本発明は、例えば自動型のバンパー等として用いら°れ
る、インサートを右する射出成形体に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an injection molded article for inserts, which is used, for example, as an automatic bumper.
［従来の技術］
従来、インサートをイＪする射出成形体において、イン
サートを被覆する成形体部は、一般に中実で厚肉のもの
となっている。[Prior Art] Conventionally, in an injection molded article into which an insert is inserted, the molded article portion that covers the insert is generally solid and thick.
［発明が解決しようとする課題］
しかしながら、Ｆ記従来のインサートを有する射出成形
体は、成形体部が中実、厚肉であるため、東くなるばか
りか、射出成形過程での冷却時に熱収縮墨−が大きくな
り、ヒケ等の外観不良を発生しやすい欠点がある。特に
インサートが金属の場合、成形体部を構成する樹脂とイ
ンサートとの冷却速度差が大きくなって、成形体部の樹
脂屑にクラックが発生したり、樹脂屑とインサートとの
間がｈａしたりしやすい問題がある。[Problems to be Solved by the Invention] However, in the injection molded article having the conventional insert described in F, the molded article part is solid and thick. There is a disadvantage that the shrinkage ink becomes large and it is easy to cause appearance defects such as sink marks. Especially when the insert is made of metal, the cooling rate difference between the resin that makes up the molded part and the insert becomes large, causing cracks to occur in the resin debris in the molded part, and haze between the resin debris and the insert. There are some easy problems.
［課題を解決するためのｆ段コ
（発明者１は、Ｌ述のイア・叶−トを石する射出或肝体
の諸問題に鑑みて鋭意研究を７−Ｔった結果本発明に至
ったものである。[Steps for solving the problem (Inventor 1 has conducted extensive research in view of the various injection and vital problems that arise from the problems mentioned above, and as a result, has arrived at the present invention.) It is something that
即ち、本発明は、インサートエの一部ヌは全表面を被覆
する成形体部２に中空８ｆ１３を４１することを特徴と
するイノサートをイｉする射出成形体である（第１関与
間）。That is, the present invention is an injection molded article that uses an inosert characterized in that a hollow part 8f13 is formed in the molded body part 2 covering the entire surface of the insert (first part).
［作 用］
本発明のように、成形体部２が中空部３を右するものと
すると、当該成形体部２は、外観Ｅは厚肉であるが、実
際は中空部３が形成されているので比較的薄い肉厚で構
成されることになる。従って、射出成形工程での冷却に
際して均一で迅速な冷却が容易で、また熱収縮量が小さ
くなるものである。[Function] As in the present invention, when the molded body part 2 is assumed to be located on the right side of the hollow part 3, the molded body part 2 has a thick wall in appearance E, but the hollow part 3 is actually formed in the molded body part 2. Therefore, it is constructed with relatively thin wall thickness. Therefore, uniform and rapid cooling is facilitated during cooling during the injection molding process, and the amount of thermal shrinkage is reduced.
［実施例Ｊ
第１図は本発明の一実施例を示す断面図で、本インサー
トを有する射出成形体は、インサート１の全面を被覆す
る成形体部２を設けたものとなっている。また、成形体
部２は、中空部３を有するものとなっている。[Example J FIG. 1 is a sectional view showing an example of the present invention, and an injection molded article having this insert is provided with a molded article portion 2 that covers the entire surface of the insert 1. Moreover, the molded body part 2 has a hollow part 3.
インサート１は、従来と同様なもので、例えば金属等の
硬質材料で構成されているものである。The insert 1 is similar to the conventional one, and is made of a hard material such as metal.
また、成形体部２を構成する樹脂も従来と同様なもので
、射出成形可能なものであれば、熱可塑性樹脂、熱可塑
性エラストマー、熱硬化性樹脂、これらと添加剤やフィ
ラーとの配合物等のいずれでもよい。In addition, the resin constituting the molded body part 2 is the same as the conventional one, and if it can be injection molded, it may be a thermoplastic resin, a thermoplastic elastomer, a thermosetting resin, or a mixture of these with additives or fillers. Any of the following is acceptable.
成形体部２の肉厚は４本インサートを有する射出成形体
の用途にもよるが、５〜４０■であることが好ましい、
また、中空部３の大きさは、中空部３をも含めた成形体
部２の断面積の１０〜５０％であることが好ましい、成
形体部２が薄過ぎるたり中空部３が大き過ぎると、成形
体部２の強度が不足しやすく、成形体部２が逆に厚遇ざ
たり中空部３が小さ過ぎると、中空部３を設けた効果が
十分得られなくなる。The wall thickness of the molded body part 2 depends on the use of the injection molded body having four inserts, but it is preferably 5 to 40 cm.
The size of the hollow part 3 is preferably 10 to 50% of the cross-sectional area of the molded body part 2 including the hollow part 3. If the molded body part 2 is too thin or the hollow part 3 is too large, If the strength of the molded body part 2 is likely to be insufficient, and if the molded body part 2 is too weak or the hollow part 3 is too small, the effect of providing the hollow part 3 will not be sufficiently obtained.
第２図は本発明の他の実施例を示す断面図でインサート
ｌの両側部のみを被覆して、中空部３を有する成形体部
２が設けられてたものとなっている。FIG. 2 is a sectional view showing another embodiment of the present invention, in which a molded body part 2 having a hollow part 3 is provided, covering only both sides of the insert l.
本発明に係るインサートを有する射出成形体は、金型内
にインサート１を設置し、金型を閉鎖した後、溶融樹脂
と加圧ガスを金型に圧入し、冷却固化した後、加圧ガス
を放出させてから取り出すことによって得ることができ
る。In the injection molded article having an insert according to the present invention, after installing the insert 1 in a mold and closing the mold, molten resin and pressurized gas are pressurized into the mold, and after cooling and solidifying, the pressurized gas is It can be obtained by releasing and then taking out.
［発明の効果］
本発明は以上説明した通りのものであり、次の効果を奏
するものである。[Effects of the Invention] The present invention is as described above, and has the following effects.
（１） ｆ＆形体部２が中空部３を有し、実質的に薄肉
に形成されているので、中実の場合に比して軽量化を図
ることができる。(1) Since the f& shape body part 2 has the hollow part 3 and is formed to be substantially thin, it is possible to reduce the weight compared to the case where it is solid.
（２）Ｅ記のように成形体部２が薄肉であるので、射出
成形での冷却に際し、全体を均一・かつ迅速に冷却でき
、成形体部２とインサート１間の冷却速度のずれを軽減
できるので、クラックの発生や成形体部２とインサート
１の剥離を防出できる。また、成形体部２の冷却に伴な
う大きな熱収縮を押えることができるので、ヒケによる
外観不良の発住を防止することもできる。(2) Since the molded body part 2 is thin as shown in E, the entire body can be cooled uniformly and quickly during injection molding, reducing the difference in cooling rate between the molded body part 2 and the insert 1. Therefore, generation of cracks and peeling of the molded body portion 2 and the insert 1 can be prevented. Further, since large thermal contraction caused by cooling of the molded body portion 2 can be suppressed, it is also possible to prevent appearance defects due to sink marks.
（３）成形体部２が中空部３を有することにより、本イ
ンサートを有する射出成形体全体の！ｔｈ撃吸収性が向
りされる。従って、自ｉｈ重の／＜ンノク−）として極
めて高い利用価値を有する製品が得られる。(3) Since the molded body part 2 has the hollow part 3, the entire injection molded body including this insert can be improved! th impact absorption is improved. Therefore, a product can be obtained that has extremely high utility value as a self-contained product.
第１図は本発明の一実施例の断面図、第２図は本発明の
他の実施例の断面図である。
ｌ：インサート
２：成形体部
３：中空部
第２図
２ 爪形体部FIG. 1 is a sectional view of one embodiment of the invention, and FIG. 2 is a sectional view of another embodiment of the invention. l: Insert 2: Molded body part 3: Hollow part Fig. 2 2 Claw-shaped body part
Claims (1)
中空部を有することを特徴とするインサートを有する射
出成形体。1) An injection molded article having an insert, characterized in that the molded article part covering a part or the entire surface of the insert has a hollow part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8826990A JPH03286816A (en) | 1990-04-04 | 1990-04-04 | Injection molded body with insert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8826990A JPH03286816A (en) | 1990-04-04 | 1990-04-04 | Injection molded body with insert |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03286816A true JPH03286816A (en) | 1991-12-17 |
Family
ID=13938177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8826990A Pending JPH03286816A (en) | 1990-04-04 | 1990-04-04 | Injection molded body with insert |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03286816A (en) |
-
1990
- 1990-04-04 JP JP8826990A patent/JPH03286816A/en active Pending
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