JPH0761663B2 - Molding method for synthetic resin moldings - Google Patents
Molding method for synthetic resin moldingsInfo
- Publication number
- JPH0761663B2 JPH0761663B2 JP2187072A JP18707290A JPH0761663B2 JP H0761663 B2 JPH0761663 B2 JP H0761663B2 JP 2187072 A JP2187072 A JP 2187072A JP 18707290 A JP18707290 A JP 18707290A JP H0761663 B2 JPH0761663 B2 JP H0761663B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molten resin
- resin
- molding
- molded product
- 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
- B29C45/1705—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 using movable mould parts
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)
Description
【発明の詳細な説明】 《産業上の利用分野》 本発明は、合成樹脂成形品の成形法に関する。TECHNICAL FIELD The present invention relates to a method for molding a synthetic resin molded article.
《従来の技術》 従来の合成樹脂成形品の成形法としては、スタンピング
モールド工法がある。即ちこのスタンピングモールド工
法は第７図に示すように上型３と樹脂注入機６を備えた
下型４とから成る成形装置10において、所定量の溶融樹
脂２を樹脂注入機６から下型４の上面に注入した後、第
８図に示すように上型３を下降させて下型４に圧締し、
溶融樹脂２を型キャビティ５の中に充満させて成形品１
を成形していた。<< Conventional Technology >> As a conventional molding method of a synthetic resin molded article, there is a stamping molding method. That is, as shown in FIG. 7, this stamping mold construction method uses a molding apparatus 10 composed of an upper mold 3 and a lower mold 4 equipped with a resin injecting machine 6 to supply a predetermined amount of molten resin 2 from the resin injecting machine 6 to the lower mold 4. After injecting into the upper surface of, the upper mold 3 is lowered and clamped to the lower mold 4 as shown in FIG.
Molded product 1 by filling mold cavity 5 with molten resin 2
Had been molded.
《発明が解決しようとする課題》 しかしながら、このような従来の技術では、第９図に示
すように成形品１に偏肉部1bがあると成形品本体1aと偏
肉部1bとの間に溶融樹脂の冷却速度に差があるために、
この偏肉部1bにひけ1cが生じたり、成形品本体1aに反り
1dが発生するなどの問題点があった。<< Problems to be Solved by the Invention >> However, in such a conventional technique, when the molded product 1 has an uneven thickness portion 1b as shown in FIG. 9, it is between the molded product body 1a and the uneven thickness portion 1b. Due to the difference in the cooling rate of the molten resin,
A sink mark 1c is generated on the uneven thickness portion 1b, or the molded product body 1a is warped.
There was a problem such as the occurrence of 1d.
また、大型の成形品を成形するときには、溶融樹脂の中
心部分と流動末端部分では冷却速度に差異があるため
に、溶融樹脂の注入口を多点ゲートにしたり、溶融樹脂
の供給バランス対策を施したり、或いは高流動性樹脂材
料を選択するなどコストアップ要因につながる種々の問
題点があった。In addition, when molding a large-sized molded product, there are differences in the cooling rate between the center part of the molten resin and the flow end part.Therefore, the molten resin injection port should be a multi-point gate, and measures should be taken to balance the molten resin supply. However, there are various problems such as selection of a high-fluidity resin material, which causes a cost increase.
更に、表皮同時貼着成形では注入された溶融樹脂は高
温、高圧であるために表皮が傷んで成形品の外観を損な
うなどの問題点があった。Further, in the simultaneous skin attachment molding, there is a problem in that the injected molten resin is at high temperature and high pressure, so that the skin is damaged and the appearance of the molded product is impaired.
本発明は上記の問題点に着目してなされたものであっ
て、その目的とするところは、成形品にひやけ反りを発
生させず、且つ低流動性樹脂材料を使用して大型成形品
の成形も可能であり、しかも外観の良い表皮同時貼着成
形品を得る成形法を提供することにある。The present invention has been made by paying attention to the above problems, and an object thereof is to prevent the occurrence of scorching warpage in a molded product, and to use a low fluidity resin material for a large molded product. It is an object of the present invention to provide a molding method capable of molding and also obtaining a molded article for simultaneous skin attachment with a good appearance.
《課題を解決するための手段》 上記の目的を達成するために、本発明は、上型と下型と
の間に所定の間隔を保たせた状態で所定量の溶融された
合成樹脂を下型に注入した後、引続き上型が加圧成形に
至る過程で溶融樹脂の内部にガス体を圧入して、次に上
型と下型を圧締して該上下型が形成する型キャビティ内
に溶融樹脂を充満させ成形するようにしたことを特徴と
する合成樹脂成形品の成形法である。<< Means for Solving the Problems >> In order to achieve the above-mentioned object, the present invention provides a predetermined amount of molten synthetic resin with a predetermined distance maintained between an upper mold and a lower mold. Inside the mold cavity formed by the upper and lower molds by injecting a gas into the molten resin in the process of the upper molds reaching the pressure molding after being injected into the molds. It is a method for molding a synthetic resin molded article, characterized in that it is filled with molten resin to mold.
また、上記の目的を達成するために本発明は、上型と下
型との間に所定の間隔を保たせた状態で、所定量の溶融
された合成樹脂を型キャビティ内に注入しつつ溶融樹脂
の内部にガス体を圧入して、次に上型と下型を圧締して
型キャビティ内に溶融樹脂を充満させ成形するようにし
たことを特徴とする合成樹脂成形品の成形法である。Further, in order to achieve the above-mentioned object, the present invention melts while injecting a predetermined amount of melted synthetic resin into a mold cavity while maintaining a predetermined interval between the upper mold and the lower mold. A method for molding synthetic resin molded products, characterized in that a gas body is pressed into the resin, and then the upper and lower molds are clamped to fill the molten resin in the mold cavity for molding. is there.
《作用》 本発明による合成樹脂成形品の成形法は上型と下型との
間に所定の間隔を保たせた状態で所定量の溶融樹脂を下
型に注入した後、引続き上型を下降させて上型が加圧成
形に至る過程でガス体を溶融樹脂の内部に圧入し、上型
の加圧力によって溶融樹脂を型キャビティに充満させる
方法であるため、又上型と下型との間に所定の間隔を保
たせた状態で所定量の溶融樹脂を型キャビティ内に注入
しつつ、溶融樹脂の内部にガス体を圧入し、上型の加圧
力によって溶融樹脂を型キャビティに充満させる方法で
あるため、溶融樹脂は低温、低圧で作用し、また低流動
性の材料を選択することも可能で成形品のひけや反りな
どを防止することができるとともに、表皮同時貼着成形
においても表皮を傷めずに外観も向上する。<< Operation >> In the method for molding a synthetic resin molded product according to the present invention, a predetermined amount of molten resin is injected into the lower mold while keeping a predetermined space between the upper mold and the lower mold, and then the upper mold is continuously lowered. In this process, the gas body is pressed into the molten resin in the process of the upper mold reaching the pressure molding, and the molten resin is filled in the mold cavity by the pressing force of the upper mold. While injecting a predetermined amount of molten resin into the mold cavity while maintaining a predetermined interval between them, a gas body is pressed into the molten resin and the molten resin is filled in the mold cavity by the pressing force of the upper mold. Since it is a method, the molten resin acts at low temperature and low pressure, and it is possible to select a material with low fluidity, so that it is possible to prevent sinking and warping of molded products, and also in simultaneous skin attachment molding The appearance is improved without damaging the epidermis.
更に低温、低圧の溶融樹脂内部に圧入されたガス体が溶
融樹脂の流動性を高めるために大型成形品の成形が低コ
ストで可能になる。Further, since the gas body pressed into the molten resin at low temperature and low pressure enhances the fluidity of the molten resin, it is possible to mold a large-sized molded product at low cost.
《実施例》 以下、本考案の実施例を図面に基づいて説明する。<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.
第１図乃至第４図は本発明に係る合成樹脂成形品の成形
法を示す説明図である。図面中12は溶融樹脂、13は上
型、14は下型、20はガス体である。1 to 4 are explanatory views showing a molding method of a synthetic resin molded product according to the present invention. In the drawing, 12 is a molten resin, 13 is an upper mold, 14 is a lower mold, and 20 is a gas body.
第１図は固定型である下型14に対して可動型である上型
13が下降して上型13と下型14の間で加圧成形する成形装
置10の要部断面図である。下型14の側面に樹脂注入機16
を備え、この樹脂注入機16の先端のノズル17から溶融樹
脂がマニホールドゲート19を通って下型14の上面に注入
される。更に樹脂注入機16の内部には共通のノズル17を
有するガス圧入口18を備えている。FIG. 1 shows a lower mold 14 which is a fixed mold and an upper mold which is a movable mold.
FIG. 3 is a cross-sectional view of a main part of a molding device 10 in which 13 is lowered to perform pressure molding between an upper mold 13 and a lower mold 14. Resin injection machine 16 on the side of lower mold 14
The molten resin is injected from the nozzle 17 at the tip of the resin injecting machine 16 through the manifold gate 19 to the upper surface of the lower mold 14. Further, inside the resin injecting machine 16, a gas pressure inlet 18 having a common nozzle 17 is provided.
次に作用を説明する。Next, the operation will be described.
第２図において、上型13と下型14の間に所定の間隔を保
たせて上型13を一時停止させ、この状態で所定の溶融樹
脂12を樹脂注入機16のノズル17からマニホールドゲート
19を通し、下型14の上面に注入する。In FIG. 2, the upper die 13 is temporarily stopped by keeping a predetermined space between the upper die 13 and the lower die 14, and in this state, a predetermined molten resin 12 is supplied from the nozzle 17 of the resin injecting machine 16 to the manifold gate.
It is poured through 19 and is injected on the upper surface of the lower mold 14.
次に第３図に示すように上型13を下降させると同時に、
ガス圧入口18からノズル17を通して溶融樹脂12の内部に
ガス体20を圧入する。このとき、型キャビティ15には空
隙が残っている。更に上型13を下降させると第４図に示
すように上型13は下型14に圧締されながら、この加圧力
によってガス体20がつぶされてガス体20の圧力が高めら
れて溶融樹脂12を型キャビティ15内に充満させるように
働き、作用完了後は第５図に示すように成形品11の内部
に中空部21が形成される。Next, as shown in FIG. 3, while lowering the upper mold 13,
The gas body 20 is pressed into the molten resin 12 from the gas pressure inlet 18 through the nozzle 17. At this time, a void remains in the mold cavity 15. When the upper die 13 is further lowered, the upper die 13 is clamped by the lower die 14 as shown in FIG. 4, and the pressure of the gas body 20 is crushed by the applied pressure, and the pressure of the gas body 20 is increased to melt the molten resin. The mold cavity 15 is filled with 12 and, after the operation is completed, a hollow portion 21 is formed inside the molded product 11 as shown in FIG.
即ち、溶融樹脂12を型キャビティ15に充満させるのは、
上型13の加圧力であるため低温、低圧で且つ低流動性の
溶融樹脂12を選択することができると共に、ガス体20の
圧力によって成形品11の偏肉部や複雑な形状の所にも溶
融樹脂12が行き渡るので成形品11にひけや反りなどの有
害な欠陥が生じることがなく、大型の成形品の成形も可
能となる。また、表皮同時貼着成形においても、上型と
下型の間に予め表皮をセットして前述の工程で成形を行
なうと溶融樹脂は低温、低圧で作用するので表皮を傷め
ることなく表皮同時貼着成形品を得る。That is, filling the molten resin 12 into the mold cavity 15 is
Since the pressure of the upper mold 13 is applied, it is possible to select the low-temperature, low-pressure and low-fluidity molten resin 12, and the pressure of the gas body 20 can be applied to the uneven thickness portion of the molded product 11 and the complicated shape. Since the molten resin 12 spreads, harmful defects such as sink marks and warpage do not occur in the molded product 11, and it is possible to mold a large molded product. Also in the simultaneous skin attachment molding, if the outer skin is set in advance between the upper mold and the lower mold and molding is performed in the above process, the molten resin acts at low temperature and low pressure, so that the simultaneous skin sticking can be performed without damaging the skin. Obtain a molded article.
更に、第２の実施例として第６図に示すように成形品に
偏肉部が複数個あるときには、下型14の側面に複数のガ
ス圧入口18a,18bを別個に設けて溶融樹脂12を下型14の
上面に注入した後、偏肉部13a,13bに対応する溶融樹脂1
2の内部にそれぞれガス体20a,20bを圧入するようにする
と、前記と同様の作用によって上型13の加圧力とガス体
20a,20bの圧力が溶融樹脂12を型キャビティ15に充満さ
せて、欠陥のない成形品を得ることができる。Further, as shown in FIG. 6 as a second embodiment, when the molded product has a plurality of uneven thickness portions, a plurality of gas pressure inlets 18a, 18b are separately provided on the side surface of the lower mold 14 to apply the molten resin 12 to the molten resin 12. After injecting into the upper surface of the lower mold 14, the molten resin 1 corresponding to the uneven thickness portions 13a and 13b
When the gas bodies 20a and 20b are respectively press-fitted into the inside of 2, the pressurizing force of the upper mold 13 and the gas body are caused by the same action as described above.
The molten resin 12 is filled in the mold cavity 15 by the pressure of 20a and 20b, and a defect-free molded product can be obtained.
また、成形品の形状によって溶融樹脂に圧入されたガス
体が加圧成形中に溶融樹脂の表層を破ることがあるた
め、このような場合にはガス体を単独ではなく、溶融樹
脂を注入しつつ同時に圧入することによってガス体を成
形品の中央部分に入り易くすることも出来る。Also, depending on the shape of the molded product, the gas body pressed into the molten resin may break the surface layer of the molten resin during pressure molding.In such a case, the molten resin should be injected instead of the gas body alone. It is also possible to make it easier for the gas body to enter the central part of the molded product by simultaneously press-fitting.
《発明の効果》 以上説明したように、本発明は上型と下型との間に所定
の間隔を保たせた状態で所定量の溶融された合成樹脂を
下型に注入した後、引続き上型が加圧成形に至る過程で
溶融樹脂の内部にガス体を圧入して、次に上型と下型を
圧締して該上下型が形成する型キャビティ内に溶融樹脂
を充満させ成形するようにした成形法である。<Effects of the Invention> As described above, the present invention continuously injects a predetermined amount of molten synthetic resin into the lower mold while keeping a predetermined distance between the upper mold and the lower mold, and then continues. In the process of the mold reaching the pressure molding, a gas body is pressed into the molten resin, and then the upper mold and the lower mold are clamped to fill the molten resin into the mold cavity formed by the upper and lower molds to mold. This is the molding method.
また、本発明は、上型と下型との間に所定の間隔を保た
せた状態で、所定量の溶融された合成樹脂の型キャビテ
ィ内に注入しつつ溶融樹脂の内部にガス体を圧入して、
次に上型と下型を圧締して型キャビティ内に溶融樹脂を
充満させ成形するようにした成形法である。Further, according to the present invention, a gas body is press-fitted into the molten resin while injecting a predetermined amount of molten synthetic resin into a mold cavity while keeping a predetermined distance between the upper mold and the lower mold. do it,
Next, it is a molding method in which the upper mold and the lower mold are clamped so that the mold cavity is filled with the molten resin and molded.
従って、上型の加圧力によって低温、低圧の溶融樹脂を
型キャビティ内に充満させると共に、溶融樹脂の内部に
圧入されたガス体が上型の加圧力によってガス圧が高め
られて溶融樹脂の流動性を高めるように作用するから、
成形品にひけや反りなどの有害な欠陥が生じることがな
く、且つ低流動性材料を選択することによって安価な大
型成形品の成形が可能となる。Therefore, the mold cavity is filled with the low-temperature and low-pressure molten resin by the pressure of the upper mold, and the gas pressure injected into the molten resin increases the gas pressure by the pressure of the upper mold, and the molten resin flows. Because it acts to enhance sex
A harmful large defect such as a sink mark or a warp does not occur in the molded product, and an inexpensive large molded product can be molded by selecting a low fluidity material.
また、表皮同時貼着成形においても溶融樹脂は低温、低
圧で作用するのでクロスの毛倒れ、表皮の傷、つぶれ等
の欠陥を生じることがなく外観の良い成形品が得られ
る。Further, even in the simultaneous skin attachment molding, the molten resin acts at a low temperature and a low pressure, and therefore a molded article having a good appearance can be obtained without causing defects such as hair fall of the cloth, scratches and crushing of the epidermis.
第１図は本発明に係る成形法の成形装置の要部断面図、
第２図乃至第４図は本発明に係る成形法の一実施例の工
程説明図、第５図は成形品の断面図、第６図は本発明に
係る成形法の他の実施例の工程説明図、第７図及び第８
図は従来の実施例の成形工程説明図、第９図は同成形品
の断面図である。 11……成形品、12……溶融樹脂、 13……上型（可動型）、14……下型（固定型）、 16……樹脂注入口、18……ガス圧入口、 20……ガス体、21……中空部。FIG. 1 is a sectional view of a main part of a molding apparatus for a molding method according to the present invention,
2 to 4 are process explanatory views of one embodiment of the molding method according to the present invention, FIG. 5 is a sectional view of a molded product, and FIG. 6 is a process of another embodiment of the molding method according to the present invention. Explanatory drawing, FIG. 7 and FIG.
FIG. 9 is a diagram for explaining a molding process of a conventional example, and FIG. 9 is a sectional view of the same molded product. 11 …… Molded product, 12 …… Fused resin, 13 …… Upper mold (movable mold), 14 …… Lower mold (fixed mold), 16 …… Resin injection port, 18 …… Gas pressure inlet, 20 …… Gas Body, 21 ... Hollow part.
Claims (2)
状態で所定量の溶融された合成樹脂を下型に注入した
後、引き続き上型が加圧成形に至る過程で溶融樹脂の内
部にガス体を圧入して、次に上型と下型を圧締して該上
下型が形成する型キャビティ内に溶融樹脂を充満させ成
形するようにしたことを特徴とする合成樹脂成形品の成
形法。1. A process of injecting a predetermined amount of molten synthetic resin into a lower mold while maintaining a predetermined gap between the upper mold and the lower mold, and subsequently in the process of the upper mold reaching pressure molding. A synthetic method characterized in that a gas body is press-fitted inside the molten resin, and then the upper mold and the lower mold are clamped to fill the molten resin into the mold cavity formed by the upper and lower molds to mold the resin. Molding method for resin molded products.
状態で所定量の溶融された合成樹脂を型キャビティー内
に注入しつつ溶融樹脂の内部にガス体を圧入して、次に
上型と下型を圧締して型キャビティ内に溶融樹脂を充満
させ成形するようにしたことを特徴とする合成樹脂成形
品の成形法。2. A gas body is pressed into the molten resin while injecting a predetermined amount of molten synthetic resin into a mold cavity while maintaining a predetermined gap between the upper mold and the lower mold. Then, the upper mold and the lower mold are clamped to fill the molten resin in the mold cavity to mold the synthetic resin molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2187072A JPH0761663B2 (en) | 1990-07-17 | 1990-07-17 | Molding method for synthetic resin moldings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2187072A JPH0761663B2 (en) | 1990-07-17 | 1990-07-17 | Molding method for synthetic resin moldings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0474617A JPH0474617A (en) | 1992-03-10 |
| JPH0761663B2 true JPH0761663B2 (en) | 1995-07-05 |
Family
ID=16199647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2187072A Expired - Fee Related JPH0761663B2 (en) | 1990-07-17 | 1990-07-17 | Molding method for synthetic resin moldings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0761663B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020071113A (en) * | 2001-03-03 | 2002-09-12 | 현대자동차주식회사 | Injection molding method of assist handle grip for automobile |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4841264A (en) * | 1971-09-29 | 1973-06-16 | ||
| JPS5714968A (en) * | 1980-07-02 | 1982-01-26 | Hitachi Ltd | Process and control system for information at point of sales time |
-
1990
- 1990-07-17 JP JP2187072A patent/JPH0761663B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0474617A (en) | 1992-03-10 |
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