JPS608025A - Injection molding method of synthetic resin - Google Patents
Injection molding method of synthetic resinInfo
- Publication number
- JPS608025A JPS608025A JP11525583A JP11525583A JPS608025A JP S608025 A JPS608025 A JP S608025A JP 11525583 A JP11525583 A JP 11525583A JP 11525583 A JP11525583 A JP 11525583A JP S608025 A JPS608025 A JP S608025A
- Authority
- JP
- Japan
- Prior art keywords
- water
- molded product
- mold
- molten resin
- pressure water
- 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
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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7306—Control circuits therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
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っては、第１図ζこ示すように、
射出機ａより金型す内に溶融樹脂を充填し、２ 頁
その溶融樹脂を金型すに装備した冷却機構Ｃによって冷
却硬化させることにより成形品ｄを形成している。In the conventional injection molding method, as shown in Figure 1,
A molded product d is formed by filling a mold with molten resin from an injection machine a, and cooling and hardening the molten resin by a cooling mechanism C equipped in the mold.
しかし従来は、第２図に拡大図にて示すように、成形品
ｄの本体ｅの内面に厚肉部ｆを設けているので、該厚肉
部ｆと本体ｅとの一体的な部分がいっそう肉厚になって
しまい、このため、本体ｅの厚肉部ｆと対応する位置の
表面及び内面が凹んでしまってひけｇが生じる問題があ
る。また、冷却機構Ｃは冷媒体が金型すを冷やすことに
よって溶融樹脂を間接的に冷却させているので、溶融樹
脂が完全に冷却するまでに時間が長くかかる難点がある
。However, conventionally, as shown in the enlarged view in FIG. 2, a thick part f is provided on the inner surface of the main body e of the molded product d, so that the thick part f and the main body e are integrally formed. This results in an even thicker wall, and as a result, there is a problem in that the surface and inner surface of the main body e at positions corresponding to the thick portion f are depressed, resulting in sink marks g. Furthermore, since the cooling mechanism C indirectly cools the molten resin by cooling the mold with a cooling medium, there is a drawback that it takes a long time for the molten resin to be completely cooled.
本発明は、上記事情に鑑み、肉厚が不均一であってもひ
けが生じるのを防止することができ、また溶融樹脂の冷
却を速やかに行うことができるよう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 provides a synthetic resin molded product that can prevent sink marks even if the wall thickness is uneven, and can quickly cool molten resin. The purpose of this invention is to provide an injection molding method.
以下、本発明を第３図乃至第９図に従って説明する。第
３図乃至第５図は本発明による射出成形３ 頁
法の第１の実施例を示している。The present invention will be explained below with reference to FIGS. 3 to 9. 3 to 5 show a first embodiment of the injection molding three-page method according to the present invention.
本発明は、第３図に示すようｌこ、成形品１をなす溶融
樹脂を射出機２によって金型３内に充填させ、その溶融
樹脂を冷却機構４によって冷却硬化させることにより、
厚肉部１１を有する成形品１を成形している。As shown in FIG. 3, the present invention includes filling a mold 3 with a molten resin forming a molded product 1 using an injection machine 2, and cooling and hardening the molten resin using a cooling mechanism 4.
A molded product 1 having a thick wall portion 11 is molded.
具体的に述べると、前記成形品１は丸い箱型をなしてお
り、その内周に厚肉部１１を設けている。Specifically, the molded product 1 has a round box shape, and has a thick wall portion 11 on its inner periphery.
前記金型３は、成形品１の表面がわをなす固定部３１と
成形品１の内面がわをなす可動部３２とによって構成さ
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。また金型３に
は、成形品１の厚肉部１１と対応する位置に通水孔５を
有する多孔部材６を配設している。即ち、多孔部材６は
、金型可動部３２において肉厚部１１を形成する部分に
埋設されており、溶融樹脂に対して耐熱性のある材料、
例えば金属やセラミックス等からなっている。前記通水
孔５は詳細に図示していないが、多孔部材６中に肉厚部
１１に向うように複数貫通されている。この通水孔５は
、溶融樹脂が金型３内に充填されたときに入り込まない
程度の大きさく約５〜３Ｑｕｍ）をなしている。The mold 3 is composed of a fixed part 31 forming a curved surface of the molded product 1 and a movable part 32 forming a curved inner surface of the molded product 1. When the molded product 1 is molded into the movable part 32, An ejection pin 33 is provided for releasing the mold. Further, the mold 3 is provided with a porous member 6 having water passage holes 5 at positions corresponding to the thick portions 11 of the molded product 1. That is, the porous member 6 is embedded in a portion of the mold movable portion 32 that forms the thick wall portion 11, and is made of a material that is heat resistant to molten resin.
For example, it is made of metal, ceramics, etc. Although the water passage holes 5 are not shown in detail, a plurality of the water holes 5 are penetrated through the porous member 6 toward the thick portion 11. The water passage hole 5 has a size of about 5 to 3 Qum, which is large enough to prevent the molten resin from entering the mold 3 when it is filled.
そして、通水孔５の他端に通水路７を介して圧、力水制
御手段８を設け、該圧力水制御手段８によって多孔部材
６の通水孔５に圧力水を送り込めるようにしている。前
記通水路７は可動部３２において、その一端を多孔部材
６の通水孔５に連通しかつその他端を外部に開口させて
いる。前記圧力水制御手段８は、金型３内に充填した溶
融樹脂が冷却硬化しつつ状態にあるとき、制御部８１が
方向切換弁８２ 、８３を閉じると共に方向切換弁別を
開くことにより、圧送ポンプ８５から吐出された圧力水
が圧力弁８６．方向切換弁８４．前記通水路７を経て多
孔部材６の通水孔５に送り込まれることができるように
なっている。そして溶融樹脂が完全に硬化してしまう頃
に、制御部８１が方向切換弁別を閉じると共に方向切換
弁８２ 、８３を開き吸水ポンプ８７により金型３内の
圧力水を吸い込んで排水することができるようになって
いる。このため、前記制御−−５−頁
部８１は、射出機２が溶融樹脂を充填してから溶融樹脂
が硬化するまでの間に方向切換弁８２〜８４を所望位置
に切換え制御することができるようにセットされている
。A pressure and force water control means 8 is provided at the other end of the water passage hole 5 via a water passage 7, so that the pressure water control means 8 can feed pressure water into the water passage hole 5 of the porous member 6. There is. The water passage 7 has one end in the movable part 32 communicating with the water passage hole 5 of the porous member 6, and the other end opening to the outside. When the molten resin filled in the mold 3 is being cooled and hardened, the pressure water control means 8 controls the pressure water pump by causing the control section 81 to close the directional switching valves 82 and 83 and open the directional switching valve. Pressure water discharged from pressure valve 86. Directional switching valve 84. The water can be fed into the water holes 5 of the porous member 6 through the water passage 7. Then, when the molten resin is completely cured, the control section 81 closes the direction switching valve and opens the direction switching valves 82 and 83, allowing the water suction pump 87 to suck in the pressure water in the mold 3 and drain it. It looks like this. Therefore, the control section 81 can switch and control the directional control valves 82 to 84 to desired positions after the injection machine 2 fills the molten resin with the molten resin and until the molten resin hardens. It is set as follows.
成形品１を成形する場合、金型３内に射出機２によって
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１１を設けているので
、第２図に示すようなひけｇ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、圧
力水制御手段８により圧送ポンプ８５からの圧力水が通
水路７を介して多孔部材６の通水孔５に送られ、その通
水孔５を通った圧力水は、溶融樹脂が硬化するまでの間
第５図（ａ）に示すように厚肉部１１の内面を押圧する
ので、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、圧力水は厚肉部１１を直に冷却する
ので、冷却機構４が溶融樹脂を間接的に冷却しても、そ
れだけ溶融樹脂の冷却を速くさせることができる。When molding the molded product 1, the mold 3 is filled with molten resin using the injection machine 2, and the molten resin is gradually cooled and hardened. A shrinkage g as shown in FIG. 2 is about to occur. However, when the molten resin in the mold 3 is in a state of hardening, the pressure water control means 8 sends pressure water from the pressure pump 85 to the water passage hole 5 of the porous member 6 via the water passage 7. The pressure water passing through the water hole 5 presses the inner surface of the thick part 11 until the molten resin hardens, as shown in FIG. 5(a), causing sink marks on the surface of the molded product 1. can be prevented. Moreover, since the pressurized water directly cools the thick portion 11, even if the cooling mechanism 4 cools the molten resin indirectly, the molten resin can be cooled that much faster.
また、第５図（ｂ）に示す如く厚肉部１１を押圧した一
矛−頁
圧力水は、溶融樹脂が硬化した後で圧力水制御手段８に
よって排水されるので、厚肉部１１の内面が凹んでも、
成形品１の外観が損われることがない。In addition, as shown in FIG. 5(b), the pressure water that presses the thick part 11 is drained by the pressure water control means 8 after the molten resin has hardened, so that the inner surface of the thick part 11 is drained by the pressure water control means 8. Even if it gets dented,
The appearance of the molded product 1 is not impaired.
第６図及び第７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、金型３において成形
品１の周縁に設けた厚肉部１１と対応する位置に、通水
孔５を有する多孔部材６を埋設し、金型３内に充填した
溶融樹脂が冷却硬化しているときに、第３図に示した圧
力水制御手段８によって圧力水を多孔部材６の通水孔５
に送り込んで圧力水が厚肉部１１を押圧することをこよ
り、成形品１にひけが起きるのを防止することができる
と共に、圧力水が厚肉部１１を冷却することによって溶
融樹脂の冷却速度を高めることができるようになってい
る。従って、この実施例は基本的には前記第１の実施例
と同様の効果を得ることができる。6 and 7 show a second embodiment of the injection molding method according to the invention. In this embodiment, a porous member 6 having water passage holes 5 is embedded in a mold 3 at a position corresponding to a thick wall portion 11 provided on the periphery of a molded product 1, and the molten resin filled in the mold 3 is During cooling and hardening, the pressure water control means 8 shown in FIG.
By sending pressurized water to press the thick wall portion 11, it is possible to prevent sink marks from occurring in the molded product 1, and the cooling rate of the molten resin is reduced by the pressure water cooling the thick wall portion 11. It is now possible to increase the Therefore, this embodiment can basically achieve the same effects as the first embodiment.
第８図及び第９図は本発明による射出成形法の第３の実
施例を示している。この実施例３は、全体が厚肉をなす
ノブに適用したものであって、金型３においてノブ成形
品１の凹部１２と対応する位置に多孔部材６を埋設し、
該多孔部材６の通水孔５に送り込まれた圧力水が、ノブ
成形品１の凹部１２から外方に押圧するようにしている
。これにより、ノブ成形品１のひけを防止して所望形状
のものを形成することができると共に、溶融樹脂の冷却
時間を短縮することができるのは勿論の他、従来のよう
にひけを防ぐため二種類の金型を用いて二層に形成した
ものと比較すると、ノブ成形品１を一種類の金型で成形
できるので、それだけ製造工数の削減及び労力の省力化
を行うことができる。8 and 9 show a third embodiment of the injection molding method according to the invention. Embodiment 3 is applied to a knob having a thick wall as a whole, and a porous member 6 is embedded in a mold 3 at a position corresponding to a recess 12 of a knob molded product 1.
The pressure water sent into the water passage hole 5 of the porous member 6 is pressed outward from the recess 12 of the knob molded product 1. As a result, it is possible to prevent the knob molded product 1 from sinking and form a desired shape, and of course it is possible to shorten the cooling time of the molten resin. Compared to forming the knob molded product 1 in two layers using two types of molds, the knob molded product 1 can be molded with one type of mold, so the number of manufacturing steps and labor can be reduced accordingly.
以上述べたように、本発明は、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、金型に設けた多
孔部材の通水孔に圧力水制御手段によって圧力水を送り
込み、その圧力水が通水孔から成形品厚肉部の背面を押
圧するようにしたので、肉厚が不均一であっても成形品
にひけが起こるのを確実に防止することができると共に
、溶融樹脂の冷却時間を速やかに行なって成形品の成形
時間を短縮させることができる効果がある。As described above, when the molten resin filled in the mold is cooling and hardening, pressurized water is sent by the pressure water control means to the water passage hole of the porous member provided in the mold. Since the pressurized water presses the back surface of the thick-walled part of the molded product from the water passage hole, it is possible to reliably prevent sink marks from occurring in the molded product even if the wall thickness is uneven, and This has the effect of quickly cooling the molten resin and shortening the molding time of the molded product.
第１図は従来の射出成形法を示す概略図、第２図は従来
の成形法によって成形された成形品を示す拡大断面図、
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■矢視に沿う金型可動部の正
面図、第５図（ａ）は溶融樹脂が硬化しているときの圧
力水の作用状態を示す要部の説明用断面図、同図（ｂ）
は溶融樹脂が硬化したときの圧力水の排水状態を示す要
部の説明用断面図、第６図は本発明による射出成形法の
第２の実施例を示す要部の断面図、第７図は成形品を示
す全体斜視図、第８図は本発明による射出成形法の第３
の実施例を示す要部の断面図、第９図は本発明による射
出成形法によって成形されたノブ成形品を示す斜視図で
ある。
１・・・成形品、１１・・・厚肉部、３・・・金型、６
・・・多孔部材、５・・・通水孔、８・・・圧力水制御
手段。
特許出願人 市光工業株式会社
代理人 弁理士 秋 本 正 実
第１図
第２図
第３図
第４図
第５図
塘６図
第７図Fig. 1 is a schematic diagram showing a conventional injection molding method, Fig. 2 is an enlarged sectional view showing a molded product molded by the conventional molding method,
Fig. 3 is an overall view showing the first embodiment of the injection molding method according to the present invention, Fig. 4 is a front view of the movable part of the mold along the ■ arrow direction in Fig. 3, and Fig. 5 (a) is a melting An explanatory cross-sectional view of the main part showing the working state of pressure water when the resin is hardening, same figure (b)
6 is an explanatory cross-sectional view of the main part showing the draining state of pressure water when the molten resin is cured; FIG. 6 is a cross-sectional view of the main part showing the second embodiment of the injection molding method according to the present invention; FIG. 8 is an overall perspective view showing the molded product, and FIG. 8 is a third example of the injection molding method according to the present invention.
FIG. 9 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 9 is a perspective view showing a knob molded product molded by the injection molding method according to the present invention. 1... Molded product, 11... Thick wall part, 3... Mold, 6
... Porous member, 5... Water passage hole, 8... Pressure water control means. Patent applicant: Ichikoh Kogyo Co., Ltd. Representative Patent attorney Tadashi Akimoto Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Tong 6 Figure 7
Claims (1)
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、前記金型をこけ成形品の厚肉部と対応する位置に該
厚肉部に向う複数の通水孔を有する多孔部材を埋設する
と共に、該多孔部材の通水孔に対して圧力水を送り込む
為の圧力水制御手段を設け、金型内の溶融樹脂が冷却硬
化しつつ状態にあるとき、圧力水制御手段によって前記
多孔部材の通水孔に圧力水を送り込んで該圧力水が通水
孔から成形品厚肉部の背面を押圧することにより、成形
品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。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 it, the mold is placed in a position corresponding to the thick wall part of the moss molded product. A porous member having a plurality of water holes facing the mold is buried, and a pressure water control means is provided to send pressurized water to the water holes of the porous member, so that the molten resin in the mold is cooled and hardened. When the molded product is in a state where the molded product is in a state where the molded product is in a sink state, pressure water is sent into the water passage hole of the porous member by the pressure water control means, and the pressure water presses the back surface of the thick part of the molded product from the water flow hole, thereby preventing sink marks on the molded product. An injection molding method for synthetic resin molded products, which is characterized by the fact that it is designed to prevent this from occurring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525583A JPS608025A (en) | 1983-06-28 | 1983-06-28 | Injection molding method of synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525583A JPS608025A (en) | 1983-06-28 | 1983-06-28 | Injection molding method of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS608025A true JPS608025A (en) | 1985-01-16 |
| JPS642051B2 JPS642051B2 (en) | 1989-01-13 |
Family
ID=14658153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11525583A Granted JPS608025A (en) | 1983-06-28 | 1983-06-28 | Injection molding method of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS608025A (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 |
-
1983
- 1983-06-28 JP JP11525583A patent/JPS608025A/en active Granted
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 |
|---|---|
| JPS642051B2 (en) | 1989-01-13 |
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