JPH03207630A - Resin molded product - Google Patents
Resin molded productInfo
- Publication number
- JPH03207630A JPH03207630A JP110390A JP110390A JPH03207630A JP H03207630 A JPH03207630 A JP H03207630A JP 110390 A JP110390 A JP 110390A JP 110390 A JP110390 A JP 110390A JP H03207630 A JPH03207630 A JP H03207630A
- Authority
- JP
- Japan
- Prior art keywords
- spoke parts
- hollow
- resin
- molded product
- parts
- 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
Links
- 239000011347 resin Substances 0.000 title claims abstract description 40
- 229920005989 resin Polymers 0.000 title claims abstract description 40
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はホイールキャップ等に用いる樹脂成形品に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin molded product used for wheel caps and the like.
［従来の技術］
近年、多種多様の樹脂が開発されるに伴って、その用途
も広範囲に渡ってきた。[Prior Art] In recent years, as a wide variety of resins have been developed, their uses have become widespread.
ホイールキャップについても、金属などに比べて彩色や
デザインが自由に選べる樹脂成形品が好適に用いられて
いる。For wheel caps, resin molded products are also preferred, as they allow for more freedom in choosing colors and designs than metals.
樹脂成形品を製造する場合、工程を簡便化し、大量生産
化、低コスト化するには射出成形による一休成形が最も
効率が良い。When manufacturing resin molded products, injection molding is the most efficient method for simplifying the process, mass production, and reducing costs.
しかしながらホイールキャップもしくはこれに類似した
形状の成型品に必要な強度、即ち剛性の高いスポーク部
を付与するためにはある程度スポーク部を厚肉にする必
要が有るが、一体射出成形した場合には厚肉のスポーツ
部にヒケ不良が発生してしまう。従って十分な強度を有
する樹脂成形品の一体成形は困難であった。However, in order to provide spokes with the necessary strength, that is, high rigidity, for a wheel cap or a molded product with a similar shape, it is necessary to make the spokes thick to some extent. Sinking defects occur in the sports parts of the meat. Therefore, it has been difficult to integrally mold a resin molded product with sufficient strength.
［発明が解決しようとする課題］
本発明の目的は、剛性の高いスポーク部を有するホイー
ルキャップ或いは類似形状の成形品を一体成形した樹脂
或形品を提供することにある。[Problems to be Solved by the Invention] An object of the present invention is to provide a resin or molded product that is integrally molded with a wheel cap having highly rigid spoke portions or a molded product with a similar shape.
［課題を解決するための手段及び作用］本発明の樹脂成
形品の構成上の特徴は、樹脂入口部から放射方向に複数
の中空のスポーク部と、該スポーク部に接続した非中空
の外周部を有することである。[Means and effects for solving the problems] The structural features of the resin molded product of the present invention include a plurality of hollow spoke portions radially extending from the resin inlet portion, and a non-hollow outer peripheral portion connected to the spoke portions. It is to have.
本発明の樹脂成形品は樹脂とガス体を射出するガス圧方
式の中空型物の成形法により一体成形することができた
。即ち、成形型を閉鎖し、溶融樹脂及びガス体を圧入し
、ガス体の圧力を保持しながら、溶融樹脂を冷却・硬化
した後、ガス体を放出し、型を開放して成形品を取り出
すことによって達成される。The resin molded article of the present invention could be integrally molded by a gas pressure type hollow molding method in which resin and gas are injected. That is, the mold is closed, the molten resin and gas are pressurized, the pressure of the gas is maintained while the molten resin is cooled and hardened, the gas is released, the mold is opened, and the molded product is taken out. This is achieved by
樹脂とガス体を射出するガス圧方式の中空型物の成形法
では、成形型内に射出された溶融樹脂が冷えた成形型に
接して冷却され、粘度が増加した層を形成する。この粘
度が増加した樹脂層は、次いで或いは同時に圧入された
ガス体の押圧に対しても流動することなく残留し表層を
形成する。In a gas pressure molding method for hollow moldings in which resin and gas are injected, molten resin injected into a mold is cooled in contact with a cold mold, forming a layer with increased viscosity. This resin layer with increased viscosity does not flow and remains to form a surface layer even under the pressure of the gas that is subsequently or simultaneously injected.
一方、未だ冷却固化が進んでいない芯部の溶融樹脂はガ
ス体の押圧によって流動し、結果として樹脂入口部及び
複数の放射状の厚肉スポーク部に中空部が形成される。On the other hand, the molten resin in the core, which has not yet been cooled and solidified, flows under the pressure of the gas, and as a result, hollow portions are formed at the resin inlet and at the plurality of radial thick-walled spokes.
中空成形体を成型する場合、成形体が構造上ガス体で押
圧され流動することになる溶融樹脂を受入れる空間を持
たないと、押圧され流動すべき溶融樹脂が移動せず、結
果として中空部が形成されないかもしくは途中の一部だ
けが中空となるに過ぎなくなる。この様な場合、中空部
が形成された厚肉部はヒケが防止されるが、中空部が形
成されず中実のまま固化された厚肉部にはヒケが発生し
てしまい、目的とする成形体が得られない。When molding a hollow molded body, if the molded body does not have a structural space to receive the molten resin that is pressed by the gas and flows, the molten resin that should be pressed and flowed will not move, resulting in the hollow part Either it is not formed or only a part of it becomes hollow. In such cases, sink marks will be prevented in thick wall parts where hollow parts have been formed, but sink marks will occur in thick wall parts where hollow parts have not been formed and are solidified. A molded body cannot be obtained.
本発明の特定の構造を有する成形品では、射出された溶
融樹脂が、樹脂入口部及び複数の厚肉のスポーク部を満
たすが、該厚肉のスポーク部に接続する外周部を有する
構造によって、樹脂入口部及び厚肉スポーク部の芯部か
も、ガス体によって押圧された樹脂が、該外周部の成形
空間に受入れられるため、該厚肉のスポーク部を完全に
中空構造にすることができる。In the molded product having the specific structure of the present invention, the injected molten resin fills the resin inlet portion and the plurality of thick spokes, but due to the structure having the outer peripheral portion connected to the thick spokes, Since the resin pressed by the gas body is received in the molding space of the outer periphery of the resin inlet portion and the core portion of the thick spoke portion, the thick spoke portion can be made into a completely hollow structure.
本発明の樹脂或形品は樹脂入口部から放射状にスポーク
部が構成され、そのスポーク部に接続して外周部が構成
され、中空部の周囲に非中空部を配した構造となってい
るため、スポーク部のみ中空成形を行うことができる。The resin or molded product of the present invention has a structure in which spoke parts are formed radially from the resin inlet, the outer peripheral part is connected to the spoke parts, and a non-hollow part is arranged around the hollow part. , only the spoke parts can be hollow-molded.
本発明の樹脂成形品は、スポーク部を中空としたことに
よりスポーク部の剛性を高め、しかも非中空の外周部と
組合わせることで一体成形を可能としたものである。従
って強度的に弱い継ぎ目がなく、寸法精度にも優れてい
る。The resin molded product of the present invention increases the rigidity of the spoke parts by making them hollow, and in combination with the non-hollow outer peripheral part, enables integral molding. Therefore, there are no weak joints and the dimensional accuracy is excellent.
本発明は、実質的に中実の厚肉部のない樹脂成形品であ
るため、ヒケなどの外観不良が生じる心配がなく、見栄
えの良い成形品であり、しかも中空部分が有るために軽
量で且つスポーク間の空隙構造放熱効果も有る。Since the present invention is a resin molded product that is substantially solid and has no thick-walled parts, there is no concern about appearance defects such as sink marks, and the molded product has a good appearance.Furthermore, since it has a hollow part, it is lightweight. In addition, the gap structure between the spokes also has a heat dissipation effect.
［実施例コ 以下に本発明の実施例を示してさらに詳しく説明する。[Example code] EXAMPLES The present invention will be explained in more detail by showing examples below.
第１図に本発明の実施例の一つを示した。第１図 （ａ
）は正面図、第１図（ｂ）はその断面図である。FIG. 1 shows one embodiment of the present invention. Figure 1 (a
) is a front view, and FIG. 1(b) is a sectional view thereof.
１は樹脂入口部でこれより放射状にスポーク部２が構成
され、第１図（ｂ）に示した通り、スポーク部２には中
空部４が形成され、非中空の外周部３に接続されている
。スポーク部２の断面（（ａ）のｘ−ｘ’断面）は第２
図に示す通り、円形、台形、矩形等自由に選択すること
ができる。外周部３の厚みはスポーク部２の樹脂の厚み
に相当する。Reference numeral 1 denotes a resin inlet portion, from which spoke portions 2 are formed radially, and as shown in FIG. There is. The cross section of the spoke part 2 (xx' cross section in (a)) is the second
As shown in the figure, circular, trapezoidal, rectangular, etc. can be freely selected. The thickness of the outer peripheral portion 3 corresponds to the thickness of the resin of the spoke portions 2.
［発明の効果］
本発明の樹脂或形品は一体射出成形のため、工程が簡便
でひじように効率が良く大量生産できる。又、一体構造
であるため外観上見栄えが良く、しかも全体的な強度が
高い。[Effects of the Invention] Since the resin or molded article of the present invention is integrally injection molded, the process is simple and can be mass-produced with high efficiency. Moreover, since it is a one-piece structure, it has a good appearance and has high overall strength.
本発明の樹脂成形品はホイールキャップ以外にも、例え
ばステアリングホイールや子供用三輪車のフレームなど
、強度を必要とする部分に利用することができる。The resin molded product of the present invention can be used not only for wheel caps but also for parts that require strength, such as steering wheels and frames of children's tricycles.
第１図は本発明の実施例の一つを示す図であり、第２図
は本発明の樹脂成形品のスポーク部の断面例を示す図で
ある。
１：樹脂入口部
２：スポーク部
３：外周部
４：中空部FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing an example of a cross section of a spoke portion of a resin molded product of the present invention. 1: Resin inlet section 2: Spoke section 3: Outer periphery section 4: Hollow section
Claims (1)
部と、該スポーク部に接続した非中空の外周部とを有す
ることを特徴とする樹脂成形品。(1) A resin molded product characterized by having a plurality of hollow spoke portions extending radially from the resin inlet portion and a non-hollow outer peripheral portion connected to the spoke portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP110390A JP2850029B2 (en) | 1990-01-09 | 1990-01-09 | Resin molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP110390A JP2850029B2 (en) | 1990-01-09 | 1990-01-09 | Resin molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03207630A true JPH03207630A (en) | 1991-09-10 |
| JP2850029B2 JP2850029B2 (en) | 1999-01-27 |
Family
ID=11492149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP110390A Expired - Lifetime JP2850029B2 (en) | 1990-01-09 | 1990-01-09 | Resin molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2850029B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6596370B2 (en) * | 1998-08-07 | 2003-07-22 | Toyoda Gosei Co., Ltd. | Resin molded article having opening and method for producing the same |
-
1990
- 1990-01-09 JP JP110390A patent/JP2850029B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6596370B2 (en) * | 1998-08-07 | 2003-07-22 | Toyoda Gosei Co., Ltd. | Resin molded article having opening and method for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2850029B2 (en) | 1999-01-27 |
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