JP2919603B2 - Molding method for lid-formed products - Google Patents
Molding method for lid-formed productsInfo
- Publication number
- JP2919603B2 JP2919603B2 JP32663990A JP32663990A JP2919603B2 JP 2919603 B2 JP2919603 B2 JP 2919603B2 JP 32663990 A JP32663990 A JP 32663990A JP 32663990 A JP32663990 A JP 32663990A JP 2919603 B2 JP2919603 B2 JP 2919603B2
- Authority
- JP
- Japan
- Prior art keywords
- lid
- edge
- main body
- product
- mold
- 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 - Fee Related
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)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、合成樹脂製の家電製品、家庭用品等におけ
る蓋形成形品の表面に樹脂冷却時の肉厚部に生じる歪
み、いわゆるヒケを防止し、表面を円滑面に仕上げ、か
つ所要強度を有して裏面形状に凹凸がなくすっきり仕上
げるようにする蓋形成形品の成形方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a so-called sink mark, which is generated on a surface of a lid-formed product of a synthetic resin home appliance, a household product, or the like when a resin is cooled at a thick portion when the resin is cooled. The present invention relates to a method for forming a lid-formed article, which prevents the surface from being smoothed, finishes the surface smoothly, has the required strength, and finishes the rear surface without irregularities.
家電製品、家庭用品等においては、一般に合成樹脂で
形成した蓋が取り付けられる場合が多い。In home appliances, household goods, and the like, a lid made of a synthetic resin is generally attached in many cases.
合成樹脂成形品は、デザインの自由度が増し、かつ着
色が容易にできる利点があり、各分野において汎用され
ている。Synthetic resin molded articles have the advantages of increasing the degree of freedom in design and facilitating coloring, and are widely used in various fields.
一方、合成樹脂は上述の如き利点を有するが、木製、
金属製に比べ、強度的に劣るとともに変形を起こしやす
い。On the other hand, synthetic resins have the advantages described above,
Compared to metal, it is inferior in strength and easily deformed.
これを補うため、蓋状成形品は外部から見えないその
裏面において補強用のリブを端縁近くに設けたり、ある
いは端縁を折り曲げている。In order to compensate for this, the lid-like molded product is provided with a reinforcing rib near the edge on the back surface which is not visible from the outside, or the edge is bent.
このため、蓋形成形品は、裏面側ではリブ等が突出し
ていて凹凸のある複雑な形状となり、汚れやすく、かつ
清掃が困難である。特に、コーナ部では払拭が困難で汚
れが残り、不快感を与え、さらにこのリブ付部の表面側
にはヒケが生じ、外観の円滑さを損なうものとなってい
る。For this reason, the lid-formed article has a complicated shape with projections and depressions on the back side because the ribs and the like protrude, and is easily soiled and difficult to clean. In particular, wiping is difficult at the corners, dirt remains, and discomfort is given. In addition, sinks occur on the surface side of the ribbed portions, which impairs the smoothness of appearance.
本発明は、蓋状成形品においてその裏面における補強
用のリブを省き、かつ所要強度を保持し、表面にはヒケ
等が生じないようにした蓋形成形品の成形方法を提供す
ることを目的とする。An object of the present invention is to provide a method for forming a lid-formed article in which a reinforcing rib on the back surface of the lid-shaped article is omitted, the required strength is maintained, and sink marks and the like do not occur on the surface. And
上記目的を達成するため、本発明の蓋形成形品の成形
方法は、金型のキャビティ内に樹脂注入ゲートより合成
樹脂を注入した後、金型に樹脂注入ゲートと別に設置さ
れているガスゲートより40気圧程度の高圧の不活性ガス
を注入することにより、蓋形成形品の端縁肉厚を補強リ
ブを省いて本体部肉厚より厚くするとともに、本体部と
端縁部との連設部内に加圧空洞部を形成し、端縁部と本
体部の連設部の内面を滑らかなカーブを描いて屈曲連設
するように成形することを特徴とする。In order to achieve the above object, the method of molding a lid-formed article according to the present invention comprises the steps of: injecting a synthetic resin from a resin injection gate into a mold cavity; By injecting a high-pressure inert gas of about 40 atm, the thickness of the edge of the lid-formed product is made larger than the thickness of the main body by omitting the reinforcing ribs, and the inside of the joint between the main body and the edge is formed. A pressurized cavity portion is formed, and an inner surface of a continuous portion of the edge portion and the main body portion is formed so as to be bent and connected in a smooth curve.
この蓋形完成品の成形方法は、形成品の端縁部を肉厚
とし、この肉厚部内にガスにて加圧しているため、成形
品表面にヒケが発生することなく、表面を美しく仕上げ
ることができ、しかも補強用リブをなくしても十分な強
度を得られるとともに、裏面をしっくりさせ、内側の外
観を美しく仕上げられる。According to the method for molding the lid-shaped finished product, the edge of the formed product is made thick and the gas is pressurized in the thick portion, so that the surface of the formed product is beautifully finished without sink marks. It is possible to obtain sufficient strength even without the reinforcing ribs, to make the back surface neat, and to finish the inside appearance beautifully.
以下、本発明蓋形成形品の成形方法を図示の実施例に
基づいて説明する。Hereinafter, a method for forming the lid-formed article of the present invention will be described based on the illustrated embodiment.
図において、Ａは家電製品、例えば、電気洗濯機の蓋
を示し、これは家電製品等に応じた形状、サイズを有す
るように成形される。この蓋Ａは一般にポリスチレン樹
脂をもって成形金型にて所要形状に成形するが、この樹
脂の種別は限定されることはなく、用途等に応じて任意
に選定される。In the figure, A indicates a home appliance, for example, a lid of an electric washing machine, which is formed so as to have a shape and a size corresponding to the home appliance and the like. The lid A is generally formed into a required shape with a molding die using a polystyrene resin, but the type of the resin is not limited and may be arbitrarily selected according to the use and the like.
この蓋Ａの成形は、シリンダー温度240℃、射出圧力9
0kgf/cm2で金型のキャビティ内に注入し、６秒後、金型
に樹脂注入ゲートと別に設置されているガスゲートより
圧力41kgf/cm2の圧縮窒素ガス等の不活性ガスを注入
し、その後、金型を冷却した後、およそ60〜100秒後に
金型より完成品を取り出す。This lid A was molded at a cylinder temperature of 240 ° C and an injection pressure of 9
Inject into the cavity of the mold at 0 kgf / cm 2 , and after 6 seconds, inject an inert gas such as compressed nitrogen gas with a pressure of 41 kgf / cm 2 from the gas gate installed separately from the resin injection gate into the mold, Then, after cooling the mold, the finished product is taken out from the mold approximately 60 to 100 seconds later.
なお、本発明蓋形成形品の成形法の一例を上述した
が、他の方法にて成形することも可能である。Although an example of the method for forming the lid-formed article of the present invention has been described above, it is also possible to form the lid-formed article by another method.
蓋Ａは、所要形状をした本体部１の端縁を一側方へ折
り曲げ、端縁部２とし、この本体片１と端縁部２の連設
部はデザインにより直角、または傾斜面を介して種々に
連接されるとともに本体部１の肉厚は所要強度を有する
ようにして定められるが、端縁部２はこの本体部の強度
を増すためにも、より厚いものとし、この端縁部２が従
来の補強リブを兼用させる。そして、この本体部１、端
縁部２の連設部は他のいかなる部分よりも肉厚となるの
で、この内部には成形時、不活性ガスを注入して空洞３
を形成せしめる。これにより、成形品表面にヒケの生じ
るのを未然に防止できるものとなる。The lid A is formed by bending an edge of a main body 1 having a required shape to one side to form an edge 2, and a continuous portion of the main body piece 1 and the edge 2 is formed at a right angle or through an inclined surface depending on a design. And the thickness of the main body 1 is determined so as to have a required strength. However, the edge 2 is made thicker in order to increase the strength of the main body. 2 serves also as a conventional reinforcing rib. Since the continuous portion of the main body portion 1 and the edge portion 2 is thicker than any other portion, an inert gas is injected into the inside of the hollow portion 3 during molding.
Is formed. This makes it possible to prevent sinks on the surface of the molded product.
さらに、蓋Ａの裏側では端縁部２と本体部１との連設
部分は緩やかな傾斜面４を介して屈曲連接するか、又は
円弧形の弧面を描くようにする。これにより、蓋Ａの裏
面側には補強用リブ等の突起物をなくし、内側をすっき
りさせることができる。Further, on the back side of the lid A, the continuous portion between the edge portion 2 and the main body portion 1 is bent and connected via a gentle inclined surface 4 or draws an arc-shaped arc surface. This eliminates protrusions such as reinforcing ribs on the back side of the lid A, and makes the inside clear.
また、第２図に示す実施例は、本体部１の端部に傾斜
面を有する成形品で、外形状が第１実施例とは異なる
が、成形方法及び効果は同じである。The embodiment shown in FIG. 2 is a molded product having an inclined surface at the end of the main body 1 and has an outer shape different from that of the first embodiment, but the molding method and effects are the same.
なお、成形品は蓋に限定されることはなく、類似の形
状の各種成形品にも応用できる。The molded product is not limited to the lid, and can be applied to various molded products having similar shapes.
本発明の蓋形成形品の成形方法によれば、成形品の裏
面において補強用のリブをなくし、外周部の肉厚を増す
ことにより補強効果を増すとともに、コーナ部をＣ面ま
たはＲ面とすることにより成形品端部の補強と変形防止
を図ることができ、かつ裏面形状をすっきりさせ、汚れ
などの清掃も簡易に行え、全体的に高級感を与えること
ができ、しかも、肉厚部となる部分には成形時、40気圧
程度の高圧の不活性ガスによるガス圧を加えているの
で、ヒケが生じることもなく表面を美しく仕上げられる
利点を有する。According to the method of molding a lid-formed product of the present invention, the reinforcing effect is increased by eliminating the reinforcing ribs on the back surface of the molded product and increasing the thickness of the outer peripheral portion, and the corner portion is formed with the C surface or the R surface. By doing this, it is possible to reinforce the end of the molded product and prevent deformation, and to make the back surface clear and easy to clean dirt etc., it is possible to give a luxurious feeling as a whole, and to use the thick part Since the gas pressure due to the high-pressure inert gas of about 40 atm is applied to the portion to be formed during molding, there is an advantage that the surface can be beautifully finished without sink marks.
図面は、本発明の蓋形成形品の成形方法による蓋形成形
品の一実施例を示し、第１図は、第１実施例の断面図、
第２図は第２実施例の断面図である。 第３図及び第４図は公知例の断面図である。 Ａは蓋、１は本体部、２は端縁部、３は空洞部。BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of a lid-formed article according to the method of molding a lid-formed article of the present invention, and FIG. 1 is a sectional view of the first embodiment.
FIG. 2 is a sectional view of the second embodiment. 3 and 4 are cross-sectional views of a known example. A is a lid, 1 is a main body, 2 is an edge, and 3 is a cavity.
Claims (1)
合成樹脂を注入した後、金型に樹脂注入ゲートと別に設
置されているガスゲートより40気圧程度の高圧の不活性
ガスを注入することにより、蓋形成形品の端縁肉厚を補
強リブを省いて本体部肉厚より厚くするとともに、本体
部と端縁部との連設部内に加圧空洞部を形成し、端縁部
と本体部の連設部の内面を滑らかなカーブを描いて屈曲
運動するように成形することを特徴とする蓋形完成品の
成形方法。(1) After injecting a synthetic resin into a cavity of a mold from a resin injection gate, an inert gas having a high pressure of about 40 atm is injected into the mold from a gas gate provided separately from the resin injection gate. The thickness of the edge of the lid-formed product is made thicker than the thickness of the main body by omitting the reinforcing ribs, and a pressurized cavity is formed in the continuous portion between the main body and the edge. A method of forming a lid-shaped completed product, wherein the inner surface of a continuous portion is formed so as to bend in a smooth curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32663990A JP2919603B2 (en) | 1990-11-27 | 1990-11-27 | Molding method for lid-formed products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32663990A JP2919603B2 (en) | 1990-11-27 | 1990-11-27 | Molding method for lid-formed products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04191023A JPH04191023A (en) | 1992-07-09 |
| JP2919603B2 true JP2919603B2 (en) | 1999-07-12 |
Family
ID=18190034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32663990A Expired - Fee Related JP2919603B2 (en) | 1990-11-27 | 1990-11-27 | Molding method for lid-formed products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2919603B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107289721A (en) * | 2017-07-26 | 2017-10-24 | 合肥美的电冰箱有限公司 | Refrigerator thin-walled door end cap and refrigerator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2574354Y2 (en) * | 1991-10-09 | 1998-06-11 | マツダ株式会社 | Projection structure of injection molded product |
-
1990
- 1990-11-27 JP JP32663990A patent/JP2919603B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107289721A (en) * | 2017-07-26 | 2017-10-24 | 合肥美的电冰箱有限公司 | Refrigerator thin-walled door end cap and refrigerator |
| CN107289721B (en) * | 2017-07-26 | 2019-09-17 | 合肥美的电冰箱有限公司 | Refrigerator thin-walled door end cap and refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04191023A (en) | 1992-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |