JPS642052B2 - - Google Patents
Info
- Publication number
- JPS642052B2 JPS642052B2 JP11525683A JP11525683A JPS642052B2 JP S642052 B2 JPS642052 B2 JP S642052B2 JP 11525683 A JP11525683 A JP 11525683A JP 11525683 A JP11525683 A JP 11525683A JP S642052 B2 JPS642052 B2 JP S642052B2
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- mold
- pressing member
- molten resin
- thick
- 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
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 19
- 238000001746 injection moulding Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/57—Exerting after-pressure on the moulding material
- B29C45/572—Exerting after-pressure on the moulding material using movable mould wall or runner parts
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/568—Applying vibrations to the mould parts
- B29C2045/5685—Applying vibrations to the mould parts for eliminating internal voids in the moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、合成樹脂成形品の射出成形方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding method for synthetic resin molded articles.
従来の射出成形法にあつては、第１図に示すよ
うに、射出機ａより金型ｂ内に溶融樹脂を充填
し、その溶融樹脂を冷却硬化させることによつて
成形品ｃを形成している。 In the conventional injection molding method, as shown in Fig. 1, a mold b is filled with molten resin from an injection machine a, and a molded product c is formed by cooling and hardening the molten resin. ing.
しかし、従来は、第２図に拡大図にて示すよう
に、成形品ｃの本体ｄの内面に厚肉部ｅを設けて
いるので、該厚肉部ｅと本体ｄとの一体的な部分
が厚肉になつてしまい、このため、本体ｄの厚肉
部ｅと対応する位置の表面及び内面が凹んでしま
つてひけｆが生じる問題がある。 However, conventionally, as shown in an enlarged view in FIG. 2, a thick part e is provided on the inner surface of the main body d of the molded product c, so that the thick part e and the main body d are integrated. becomes thick, and as a result, there is a problem in that the surface and inner surface of the main body d at positions corresponding to the thick portion e are recessed, resulting in a sink mark f.
本発明は、上記事情に鑑み、厚肉が不均一であ
つてもひけが生じるのを防止することができる合
成樹脂成形品の射出成形法を提供せんとするもの
である。 In view of the above circumstances, the present invention aims to provide an injection molding method for synthetic resin molded products that can prevent sink marks from occurring even if the thickness is uneven.
以下、本発明を第３図乃至第８図について説明
する。第３図乃至第５図は本発明による射出成形
法の第１の実施例を示している。 The present invention will now be described with reference to FIGS. 3 to 8. 3 to 5 show a first embodiment of the injection molding method according to the present invention.
この実施例は、第３図に示すように、成形品１
をなす溶融樹脂を射出機２によつて金型３内に充
填させ、その溶融樹脂を冷却硬化させることによ
り、厚肉部１ａを有する成形品１を成形してい
る。 In this example, as shown in FIG.
A molded article 1 having a thick wall portion 1a is formed by filling a mold 3 with a molten resin forming the shape of the molten resin using an injection machine 2, and cooling and hardening the molten resin.
具体的に述べると、成形品１は丸い箱型をなし
ており、その内面に厚肉部１ａを設けている。前
記金型３は、成形品１の表面がわをなす固定部３
１と成形品１の内面がわをなす可動部３２とによ
つて構成され、該可動部３２に、成形品１を成形
したときに離型させる為の突き出しピン３３を設
けている。 Specifically, the molded product 1 has a round box shape, and has a thick wall portion 1a on its inner surface. The mold 3 has a fixing part 3 that forms the surface of the molded product 1.
1 and a movable part 32 forming the inner surface of the molded product 1, and the movable part 32 is provided with an ejecting pin 33 for releasing the molded product 1 when it is molded.
そして金型３の可動部３２には、成形品１の厚
肉部１ａの背面と対応する位置に押圧部材４を摺
動可能に配設している。該押圧部材４は、前記厚
肉部１ａに対して前後移動できるよう可動部３２
に設けた摺動路（符号せず）中に配設され、常態
では金型３のキヤビテイの一部を構成するので、
溶融樹脂に対して耐熱性のある金属若しくはセラ
ミツクス等からなつている。また押圧部材４には
駆動手段５を連結させ、該駆動手段５によつて押
圧部材４を駆動させることができるようになつて
いる。 A pressing member 4 is slidably disposed in the movable portion 32 of the mold 3 at a position corresponding to the back surface of the thick portion 1a of the molded product 1. The pressing member 4 has a movable portion 32 so as to be able to move back and forth with respect to the thick portion 1a.
It is arranged in a sliding path (not numbered) provided in the mold 3, and normally forms part of the cavity of the mold 3.
It is made of metal, ceramics, etc. that are heat resistant to molten resin. Further, a driving means 5 is connected to the pressing member 4, so that the pressing member 4 can be driven by the driving means 5.
即ち、前記駆動手段５は、油圧ポンプ５１と、
油圧ポンプ５１からの吐出油の方向を制御する方
向切換弁５２と、該方向切換えによつてロツド５
３ａを伸縮させる油圧シリンダ５３と、中間部を
金型３の可動部３２に支持し、かつその一端を押
圧部材４に連結すると共に、その他端を前記油圧
シリンダ５３のロツド５３ａの先端に連結したア
ーム５４と、方向切換弁５２の切換えを制御する
制御部５５とを備えている。この駆動手段５は、
金型３内に充填された溶融樹脂が冷却硬化しつつ
状態にあるときに、前記制御部５５が油圧ポンプ
５１からの圧油を油圧シリンダ５３のヘツド室に
送り込むように方向切換弁５２を切換えることに
より、油圧シリンダ５３のロツド５３ａが進むと
共に、該ロツド５３ａの移動によつてアーム５４
が回動し、これによつて押圧部材４が摺動して成
形品厚肉部１ａの背面を押圧することができるよ
うになつている。その場合、押圧部材４の摺動距
離ｌは、押圧部材４の径ｄ及び樹脂の収縮率に応
じて適宜に選定することができる。また、金型３
内の溶融樹脂が完全に硬化してしまう頃に、制御
部５５が油圧ポンプ５１からの圧油を油圧シリン
ダ５３のロツド室に送り込むように方向切換弁５
２を切換えることにより、油圧シリンダ５３のロ
ツド５３ａが後退すると共に、該ロツド５３ａの
後退によつとアーム５４が逆回動し、これによつ
て押圧部材４を元の位置まで戻るように摺動させ
ることができるようになつている。そのため、前
記制御部５５は、射出機２が溶融樹脂を充填して
からその溶融樹脂が硬化するまでの間に方向切換
弁５２を所望位置に切換え制御することができる
ようにセツトされている。 That is, the driving means 5 includes a hydraulic pump 51;
A directional switching valve 52 that controls the direction of oil discharged from the hydraulic pump 51, and a directional switching valve 52 that controls the direction of oil discharged from the hydraulic pump 51;
A hydraulic cylinder 53 for expanding and contracting the hydraulic cylinder 53, an intermediate part supported by the movable part 32 of the mold 3, one end of which was connected to the pressing member 4, and the other end connected to the tip of the rod 53a of the hydraulic cylinder 53. It includes an arm 54 and a control section 55 that controls switching of the directional switching valve 52. This driving means 5 is
When the molten resin filled in the mold 3 is cooling and hardening, the control section 55 switches the directional control valve 52 so as to send pressure oil from the hydraulic pump 51 into the head chamber of the hydraulic cylinder 53. As a result, the rod 53a of the hydraulic cylinder 53 advances, and the movement of the rod 53a causes the arm 54 to move forward.
rotates, whereby the pressing member 4 slides and can press the back surface of the thick part 1a of the molded product. In that case, the sliding distance l of the pressing member 4 can be appropriately selected depending on the diameter d of the pressing member 4 and the shrinkage rate of the resin. Also, mold 3
When the molten resin inside has completely hardened, the control unit 55 controls the directional control valve 5 so that the pressure oil from the hydraulic pump 51 is sent into the rod chamber of the hydraulic cylinder 53.
2, the rod 53a of the hydraulic cylinder 53 retreats, and as the rod 53a retreats, the arm 54 rotates in the opposite direction, thereby sliding the pressing member 4 back to its original position. I am now able to do this. Therefore, the control section 55 is set so that the directional control valve 52 can be switched and controlled to a desired position after the injection machine 2 fills the molten resin with the molten resin until the molten resin hardens.
成形品１を成形する場合、金型３内に射出機２
によつて溶融樹脂を充填し、その溶融樹脂が次第
に冷却硬化するが、そのとき、成形品１は厚肉部
１ａを設けているので、第２図に示すようなひけ
ｆが起ころうとする。しかし、金型３内の溶融樹
脂が硬化しつつ状態にあるとき、押圧部材４は駆
動手段５によつて成形品１に向つて摺動し、金型
３内の溶融樹脂が硬化するまで成形品１の厚肉部
１ａを押圧するので、厚肉部１ａの内圧が上昇し
て密度を高めることができる。その結果、成形品
１の表面にひけが生じるのを防止することができ
る。しかも、厚肉部１ａの背面が押圧部材４によ
つて凹んでも、成形品１の外観が損われることが
ない。また押圧部材４は、厚肉部１ａを押圧した
後、駆動手段５によつて元の位置に復帰するの
で、次の成形工程にスムースに入ることができ
る。 When molding the molded product 1, the injection machine 2 is placed inside the mold 3.
The molded product 1 is filled with molten resin and gradually cooled and hardened, but at this time, since the molded product 1 has a thick portion 1a, a sink mark f as shown in FIG. 2 is likely to occur. However, when the molten resin in the mold 3 is in a state of hardening, the pressing member 4 is slid toward the molded product 1 by the driving means 5, and the molding is continued until the molten resin in the mold 3 is hardened. Since the thick part 1a of the product 1 is pressed, the internal pressure of the thick part 1a increases and the density can be increased. As a result, it is possible to prevent sink marks from occurring on the surface of the molded product 1. Moreover, even if the back surface of the thick portion 1a is depressed by the pressing member 4, the appearance of the molded product 1 is not impaired. Further, after pressing the thick portion 1a, the pressing member 4 is returned to its original position by the driving means 5, so that the next molding process can be smoothly started.
第６図乃至第８図は本発明による射出成形法の
第２の実施例を示している。この実施例は、ボス
部１ｂを有する成形品１に適用したものであつ
て、金型３に設けたスリーブピン３４内に押圧部
材４を摺動可能に配設すると共に、該押圧部材４
をボス部１ｂに嵌合させ、かつ該押圧部材４を駆
動手段５に連結したものである。その場合前記押
圧部材４は、コアピンの機能を兼備しており、か
つ駆動手段５の駆動によつてスリーブピン３４内
を摺動することにより、ボス部１ｂの基部内がわ
を押圧することができるようになつている。従つ
て、、第８図に示すように押圧部材４がボス部１
ｂの基部内がわを押圧することによつてその部分
の樹脂密度が高まるので、第９図に示すように成
形品ｃのボス部ｇを設けた位置の表面にひけｆが
生じる従来例と比較すると、冷却による収縮量を
極めて小さくすることができて、成形品１の表面
にひけが生じるのを防止することができる。 6 to 8 show a second embodiment of the injection molding method according to the present invention. This embodiment is applied to a molded product 1 having a boss portion 1b, and a pressing member 4 is slidably disposed within a sleeve pin 34 provided in a mold 3.
is fitted into the boss portion 1b, and the pressing member 4 is connected to the driving means 5. In that case, the pressing member 4 has the function of a core pin, and can press the inner side of the base of the boss portion 1b by sliding inside the sleeve pin 34 by driving the driving means 5. I'm starting to be able to do it. Therefore, as shown in FIG.
By pressing the inner side of the base of b, the resin density in that part increases, so as shown in Fig. 9, a sink mark f occurs on the surface of the molded product c at the location where the boss g is provided, unlike the conventional example. In comparison, the amount of shrinkage due to cooling can be made extremely small, making it possible to prevent sink marks from occurring on the surface of the molded product 1.
以上述べたように、本発明によれば、金型内に
充填された溶融樹脂が冷却硬化しつつ状態にある
とき、駆動手段によつて金型に設けた押圧部材を
摺動させて該押圧部材が成形品厚肉部の背面を押
圧するようにしたので、肉厚が不均一であつて
も、成形品にひけが生じるのを確実に防止するこ
とができる効果がある。 As described above, according to the present invention, when the molten resin filled in the mold is cooling and hardening, the driving means slides the pressing member provided on the mold to apply the pressing force. Since the member presses the back surface of the thick part of the molded product, it is possible to reliably prevent sink marks from occurring in the molded product even if the thickness is uneven.
第１図は従来の射出成形法を示す概略図、第２
図は従来の成形品によつて成形された成形品を示
す拡大面図、第３図は本発明による射出成形法の
第１の実施例を示す全体図、第４図は第３図の一
部の拡大断面図、第５図は押圧部材が厚肉部を押
圧した状態を示す説明用断面図、第６図は本発明
による射出成形法の第２の実施例を示す金型の断
面図、第７図は第６図の一部の拡大図、第８図は
押圧部材が厚肉部を押圧している状態を示す要部
の説明用断面図、第９図はボス部を有する成形品
の要部を示す従来例の断面図である。
１……成形品、１ａ……厚肉部、３……金型、
４……押圧部材、５……駆動手段。
Figure 1 is a schematic diagram showing the conventional injection molding method, Figure 2
The figure is an enlarged sectional view showing a molded product molded by a conventional molded product, FIG. 3 is an overall view showing the first embodiment of the injection molding method according to the present invention, and FIG. FIG. 5 is an explanatory cross-sectional view showing a state in which a pressing member presses a thick part; FIG. 6 is a cross-sectional view of a mold showing a second embodiment of the injection molding method according to the present invention. , FIG. 7 is an enlarged view of a part of FIG. 6, FIG. 8 is an explanatory cross-sectional view of the main part showing the state in which the pressing member presses the thick part, and FIG. 9 is the molding having a boss part. FIG. 2 is a sectional view of a conventional example showing the main parts of the product. 1... Molded product, 1a... Thick wall part, 3... Mold,
4... Pressing member, 5... Drive means.
Claims (1)
ることにより、厚肉部を有する成形品を成形する
射出成形法において、前記金型には成形品の厚肉
部と対応する位置に押圧部材を摺動可能に配設す
ると共に、該押圧部材を駆動させる駆動手段を設
け、該駆動手段により金型内の溶融樹脂が冷却硬
化しつつ状態にあるときに前記摺動部材を摺動さ
せて、該押圧部材が成形品厚肉部の背面を押圧す
ることにより、成形品の表面にひけが生じるのを
防止すべくなしたことを特徴とする合成樹脂成形
品の射出成形法。1 In an injection molding method in which a molded product having a thick wall part is formed by filling a mold with molten resin and cooling and hardening the mold, the mold has a pressing member at a position corresponding to the thick wall part of the molded product. is slidably disposed, and a driving means for driving the pressing member is provided, and the driving means slides the sliding member when the molten resin in the mold is in a state of being cooled and hardened. An injection molding method for a synthetic resin molded product, characterized in that the pressing member presses the back side of the thick part of the molded product to prevent sink marks from occurring on the surface of the molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525683A JPS608026A (en) | 1983-06-28 | 1983-06-28 | Injection molding method of synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525683A JPS608026A (en) | 1983-06-28 | 1983-06-28 | Injection molding method of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS608026A JPS608026A (en) | 1985-01-16 |
| JPS642052B2 true JPS642052B2 (en) | 1989-01-13 |
Family
ID=14658174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11525683A Granted JPS608026A (en) | 1983-06-28 | 1983-06-28 | Injection molding method of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS608026A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018074437A1 (en) | 2016-10-20 | 2018-04-26 | 日清食品ホールディングス株式会社 | Dried whole egg and puffed egg product in which same is used |
| US10420358B2 (en) | 2016-03-03 | 2019-09-24 | Nissin Foods Holdings Co., Ltd. | Processed egg and method for identifying the same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4655382A (en) * | 1985-11-12 | 1987-04-07 | Raychem Corp. | Materials for use in forming electronic interconnect |
| JP2587900B2 (en) * | 1993-07-27 | 1997-03-05 | 株式会社久保田金型工作所 | Plastic injection molded products and their molds |
| EP1114709A4 (en) | 1998-04-30 | 2004-06-23 | Daisen Industry Co Ltd | Device and method for synthetic resin internal die foam molding and internal die foam molded product obtained by these device and method |
| WO2004011226A1 (en) * | 2002-07-31 | 2004-02-05 | Build A Mold Limited | Device and method for compensating shrinkage and avoiding sinkmarks for molding plastics |
-
1983
- 1983-06-28 JP JP11525683A patent/JPS608026A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10420358B2 (en) | 2016-03-03 | 2019-09-24 | Nissin Foods Holdings Co., Ltd. | Processed egg and method for identifying the same |
| WO2018074437A1 (en) | 2016-10-20 | 2018-04-26 | 日清食品ホールディングス株式会社 | Dried whole egg and puffed egg product in which same is used |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS608026A (en) | 1985-01-16 |
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