JPH0133310Y2 - - Google Patents
Info
- Publication number
- JPH0133310Y2 JPH0133310Y2 JP1983198447U JP19844783U JPH0133310Y2 JP H0133310 Y2 JPH0133310 Y2 JP H0133310Y2 JP 1983198447 U JP1983198447 U JP 1983198447U JP 19844783 U JP19844783 U JP 19844783U JP H0133310 Y2 JPH0133310 Y2 JP H0133310Y2
- Authority
- JP
- Japan
- Prior art keywords
- injection molded
- notch
- molded product
- wall thickness
- shape
- 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.)
- Expired
Links
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920006038 crystalline resin Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
本考案は各種熱可塑性樹脂射出成形品の角部形
状に関するものである。[Detailed Description of the Invention] The present invention relates to corner shapes of various thermoplastic resin injection molded products.
今日、家電、自動車、OA機器等の分野におい
て、熱可塑性樹脂製の精密な射出成形品を製造し
たい旨の要求が高まつている。この要求にこたえ
るためには、製品の素材となる樹脂に適したデザ
インを採用し、公差が小さくソリや変形のない射
出成形品を製造する必要がある。ここで射出成形
品のソリや変形を防止する方法としては、第１に
角部の外側形状を曲面状に形成する方法、第２に
補強リブを設ける方法、第３に図面第３図に示す
ような切欠き部も内側角部に設ける方法などが考
えられる。ところが、第１の方法は角部の外側形
状が曲面状に限定されてしまうのでデザイン上の
選択の幅を狭める不都合があり、第２の方法はヒ
ケ（高温で溶融した樹脂が凝固する際収縮し、凝
固するのが最も遅い箇所にその収縮が集中し表面
が陥没する現象）が表面に表われるため製品の外
観を損なうことがあり、かつ製品の構造上補強リ
ブを設けることができない場合も多く、第３の方
法は部分的に壁体の肉厚が急変するため製品の剛
性が低下し易くなり、かつ外観を損なうこともあ
る等の問題があつた。 Today, in fields such as home appliances, automobiles, and OA equipment, there is an increasing demand for the production of precision injection molded products made of thermoplastic resin. In order to meet this demand, it is necessary to adopt a design that is suitable for the resin used as the material of the product, and to manufacture injection molded products with small tolerances and without warping or deformation. Here, methods for preventing warpage and deformation of injection molded products include: firstly, forming the outer shape of the corner into a curved surface, secondly, providing reinforcing ribs, and thirdly, as shown in Figure 3 of the drawing. A possible method is to provide such a notch at the inner corner. However, the first method has the disadvantage that the outer shape of the corner is limited to a curved shape, which narrows the range of design options. However, the shrinkage concentrates in the areas where solidification is slowest, causing the surface to cave in), which may impair the appearance of the product, and in some cases reinforcing ribs cannot be provided due to the structure of the product. In most cases, the third method has problems such as the sudden change in the wall thickness in some parts, which tends to reduce the rigidity of the product and also impairs the appearance.
本考案者は、上記の問題に対処するためＬ字形
あるいは箱形構造を有する射出成形品にソリや変
形が発生するのを防止する対策を検討した。その
結果、射出成形品の角部に位置する壁体に所定形
状の切欠き部を設ければ、製品の外形デザインを
変更することなく容易にソリ、変形の発生を防止
しうることを見い出した。 In order to deal with the above-mentioned problems, the inventor of the present invention has considered measures to prevent warpage and deformation from occurring in injection molded products having an L-shaped or box-shaped structure. As a result, they discovered that by providing a notch with a predetermined shape in the wall located at the corner of an injection molded product, it is possible to easily prevent warping and deformation without changing the external design of the product. .
以下本考案の実施例を図面に従つて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図及び第２図は、本考案の一実施例を示す
射出成形品の要部縦断面図である。符号１は射出
成形品、２は射出成形品の壁体、３は前記射出成
形品の内側角部に位置する壁体に設けられる切欠
き部（図中ハツチング表示された部分）であり、
この切欠き部３は傾斜部３ａと曲面部３ｂとで構
成される。 1 and 2 are longitudinal sectional views of essential parts of an injection molded product showing an embodiment of the present invention. Reference numeral 1 denotes an injection molded product, 2 a wall of the injection molded product, and 3 a notch (hatched portion in the figure) provided in the wall located at an inner corner of the injection molded product.
This notch portion 3 is composed of an inclined portion 3a and a curved portion 3b.
ここで傾斜部３ａとは切欠き部３の深さが除々
に深くなるように形成した部分を指し、曲面部３
ｂとは同一半径で切欠き部３の深さを均一的に形
成した部分を指すもので、この曲面部は傾斜部と
比較して角部の中心に近い位置に設けられてい
る。なお切欠き部の端部と射出成形品の壁体内面
との接点は必要に応じて滑らかに形成するとよ
い。さらに符号Ｈは射出成形品の壁体の肉厚、Ｌ
は切欠き部の長手方向の直線寸法、Ｒは曲面部の
半径である。 Here, the sloped part 3a refers to the part formed so that the depth of the notch part 3 gradually becomes deeper, and the curved part 3
b refers to a portion where the depth of the notch portion 3 is uniformly formed with the same radius, and this curved portion is provided at a position closer to the center of the corner portion than the inclined portion. Note that the contact point between the end of the notch and the inner surface of the wall of the injection molded product may be formed smoothly as necessary. Furthermore, the symbol H is the wall thickness of the injection molded product, L
is the linear dimension of the notch in the longitudinal direction, and R is the radius of the curved surface.
本考案の切欠き部３は次のａ，ｂの条件を満た
す必要がある。 The notch 3 of the present invention must satisfy the following conditions a and b.
ａ 0.5H≦Ｌ≦10H
ｂ 0.1H≦Ｒ≦0.5H
即ち、本考案においてＬ＜0.5Hであると、壁
体肉厚Ｈの急変により切欠き部３に応力が集中し
た際に、その応力を吸収できずに剛性が低下し、
Ｌ＞10Hであると射出成形品１の壁体２が薄肉に
なつて製品全体の剛性を低下させ、かつ射出成形
品の角部の冷却を不均一にしてソリ発生を惹起す
る。a 0.5H≦L≦10H b 0.1H≦R≦0.5H In other words, in the present invention, when L<0.5H, when stress is concentrated in the notch 3 due to a sudden change in the wall thickness H, the stress The rigidity decreases due to the inability to absorb
If L>10H, the wall 2 of the injection molded product 1 becomes thin, reducing the rigidity of the entire product, and the corners of the injection molded product are cooled unevenly, causing warpage.
さらに本考案おいて、Ｒ＜0.1Hであると成形
時の射出成形品の冷却効果が不均一となり、収縮
によるソリ、変形が発生し、Ｒ＞0.5Hであると
射出成形品の角部の剛性が低下することとなる。 Furthermore, in this invention, if R<0.1H, the cooling effect of the injection molded product during molding will be uneven, causing warping and deformation due to shrinkage, and if R>0.5H, the corners of the injection molded product will This results in a decrease in rigidity.
なお上記ａ式において1.0H≦Ｌ≦5Hとし、上
記ｂ式において0.2H≦Ｒ≦0.4Hとすると、一層
好ましい結果が得られる。 Further, more preferable results can be obtained by setting 1.0H≦L≦5H in the above equation a and setting 0.2H≦R≦0.4H in the above equation b.
つぎに本考案の素材に適する樹脂としては、結
晶性樹脂としてポリプロピレン、ポリエチレン等
があり、非結晶性樹脂としてポリスチレン、ポリ
カーボネート等がある。また繊維等の充填材を含
む樹脂にも適用することができる。 Next, resins suitable for the material of the present invention include crystalline resins such as polypropylene and polyethylene, and non-crystalline resins such as polystyrene and polycarbonate. It can also be applied to resins containing fillers such as fibers.
本考案の切欠き部は、第１図に示す如く突き合
せ壁体２の双方の厚さＨが等しいときは、双方の
壁体に跨がつて対称状に切欠き部を形成し、第２
図に示す如く突き合せ壁体の双方の厚さが異なる
ときは、厚い方の壁体に切欠き部を片寄らせて形
成するようにするとソリや変形の発生防止にすぐ
れた効果を発揮する。 When the thickness H of both abutting walls 2 is equal as shown in FIG. 1, the notch of the present invention is formed symmetrically across both walls, and the second
As shown in the figure, when the thicknesses of the two abutting walls are different, forming the notch on the thicker wall to be biased is effective in preventing warping and deformation.
よつて本考案には、所定条件からなる切欠き部
が存在する結果、射出成形品の応力を吸収又は発
散させることができ、射出成形品のソリ、変形の
発生が防止され、Ｌ字形あるいは箱形射出成形品
の角部デザインを美しく保持できる等の実用的効
果を具有する。 Therefore, in the present invention, as a result of the presence of the notch part that meets predetermined conditions, stress in the injection molded product can be absorbed or dissipated, and warping and deformation of the injection molded product can be prevented, and the L-shape or box shape can be prevented. It has practical effects such as being able to maintain the beautiful corner design of injection molded products.
第１図及び第２図は本考案の一実施例を示す射
出成形品の要部縦断面図、第３図は従来の射出成
形品の要部縦断面図である。
１……射出成形品、２……壁体、３………切欠
き部、３ａ……傾斜部、３ｂ……曲面部、Ｈ……
壁体肉厚、Ｌ……切欠き部の長手方向の直線寸
法、Ｒ……半径。
1 and 2 are longitudinal sectional views of essential parts of an injection molded product showing an embodiment of the present invention, and FIG. 3 is a longitudinal sectional view of essential parts of a conventional injection molded product. DESCRIPTION OF SYMBOLS 1... Injection molded product, 2... Wall body, 3... Notch part, 3a... Inclined part, 3b... Curved surface part, H...
Wall thickness, L...linear dimension in the longitudinal direction of the notch, R...radius.
Claims (1)
部を設けた形状であつて、該切欠き部が傾斜部と
曲面部とで構成され、その形状が次のａ，ｂの各
条件を満たすことを特徴とする熱可塑性樹脂射出
成形品の角部形状。 切欠き部の長手 ａ 1.0×壁体の肉厚(H)≦方向の直線寸法(L)≦５
×壁体の肉厚(H) ｂ 0.2×壁体の肉厚(H)≦曲面部の半径（Ｒ）≦
0.4×壁体の肉厚(H)[Claims for Utility Model Registration] An injection molded product has a shape in which a notch is provided in the wall located at the inner corner, the notch is composed of an inclined part and a curved part, and the shape is A corner shape of a thermoplastic resin injection molded product characterized by satisfying each of the following conditions a and b. Length of notch a 1.0 x wall thickness (H) ≦ linear dimension in direction (L) ≦ 5
× Wall thickness (H) b 0.2 × Wall thickness (H) ≦ Radius of curved surface (R) ≦
0.4×wall thickness (H)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19844783U JPS60106710U (en) | 1983-12-26 | 1983-12-26 | Corner shape of thermoplastic resin injection molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19844783U JPS60106710U (en) | 1983-12-26 | 1983-12-26 | Corner shape of thermoplastic resin injection molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60106710U JPS60106710U (en) | 1985-07-20 |
| JPH0133310Y2 true JPH0133310Y2 (en) | 1989-10-09 |
Family
ID=30757446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19844783U Granted JPS60106710U (en) | 1983-12-26 | 1983-12-26 | Corner shape of thermoplastic resin injection molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60106710U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010120186A (en) * | 2008-11-17 | 2010-06-03 | Citizen Electronics Co Ltd | Injection molded article |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608028B2 (en) * | 1977-08-26 | 1985-02-28 | 豊田合成株式会社 | paint composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608028U (en) * | 1983-06-27 | 1985-01-21 | ホリゾン・インタ−ナシヨナル株式会社 | Creasing processing equipment |
-
1983
- 1983-12-26 JP JP19844783U patent/JPS60106710U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608028B2 (en) * | 1977-08-26 | 1985-02-28 | 豊田合成株式会社 | paint composition |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010120186A (en) * | 2008-11-17 | 2010-06-03 | Citizen Electronics Co Ltd | Injection molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60106710U (en) | 1985-07-20 |
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