JP2929692B2 - Forming a bottomed cylinder - Google Patents
Forming a bottomed cylinderInfo
- Publication number
- JP2929692B2 JP2929692B2 JP25957790A JP25957790A JP2929692B2 JP 2929692 B2 JP2929692 B2 JP 2929692B2 JP 25957790 A JP25957790 A JP 25957790A JP 25957790 A JP25957790 A JP 25957790A JP 2929692 B2 JP2929692 B2 JP 2929692B2
- Authority
- JP
- Japan
- Prior art keywords
- core pin
- cavity
- gate
- molded product
- bottomed cylinder
- 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 - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C45/26—Moulds
- B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は有底筒体の成形方法に関し、例えば筆記具の
軸体キャップ、試験管、細長い容器の成形方法に関す
る。Description: TECHNICAL FIELD The present invention relates to a method for molding a bottomed cylinder, for example, a method for molding a shaft cap, a test tube, and an elongated container of a writing instrument.
（従来の技術） 近年のプラスチックの素材開発改良成形技術の進歩、
成形金型の進歩によりプラスチック製品の使用が拡大さ
れており、中でも生産性の優れている射出成形分野の発
展はめざましい。文具におけるプラスチック化も例外で
はなく、ボールペンの軸、キャップ、クリップ、シャー
プペンの軸等がプラスチック化されている。(Prior art) Recent progress in plastic material development and improvement molding technology,
The use of plastic products is expanding due to advances in molding dies, and the development of the injection molding field, which has excellent productivity, is remarkable. The plasticization of the stationery is no exception, and the shaft of the ballpoint pen, the cap, the clip, the shaft of the mechanical pen, etc. are made of plastic.
又、最近の文具の傾向として細く長い物が要望され、
ペンの生インク化により偏肉のない透明軸の成形物が要
望された。さらにCADの普及により高精度の曲がりのな
いプロッター用ペンが要望されるに至った。In addition, there is a demand for thin and long items as a trend of stationery in recent years,
There has been a demand for a molded product having a transparent shaft without uneven thickness due to the use of a pen as a raw ink. Furthermore, the spread of CAD has led to a demand for high-precision, non-bending plotter pens.
しかし、上記のような細く長い有底筒状成形品の製造
に於て従来は第６図の如く、底部外面にゲートを形成し
合成樹脂を注入していた。However, in the production of the above-described thin and long bottomed cylindrical molded product, conventionally, as shown in FIG. 6, a gate was formed on the outer surface of the bottom and synthetic resin was injected.
（発明が解決しようとする課題） ところで上記従来技術にあっては、細く長い一端だけ
で支えられているコアピンの先端にピンポイントゲート
より高圧高速で樹脂が注入されるのでフリーになってい
るコアピン先端樹脂の圧力が不均一に加わり、そのため
コアピンは傾き、成形物の肉厚に偏りを生じ、注入され
る樹脂は肉厚の厚い方へ、抵抗の少い方へより流れるの
でコアピンの傾きは更に大きくなり成形物に偏肉を生
じ、この偏肉のため成形物の冷却時の収縮の差で成形物
に曲がりが発生し、コアピンの曲がり量が多いと第７図
の如く、成形品のショートや金型の破損といった重大な
損害が生じるという問題点があった。(Problems to be Solved by the Invention) By the way, in the above-mentioned prior art, the core pin which is supported by only a thin and long one end is free because the resin is injected at a higher pressure and at a higher speed than the pinpoint gate. The pressure of the tip resin is unevenly applied, which causes the core pin to tilt, resulting in uneven thickness of the molded product, and the injected resin flows to the thicker and the lower resistance, so the tilt of the core pin is Further, the molded product becomes thicker, and the molded product becomes uneven in thickness. Due to this uneven thickness, the molded product bends due to a difference in shrinkage during cooling of the molded product. If the amount of bending of the core pin is large, as shown in FIG. There has been a problem that serious damage such as a short circuit or a damaged mold occurs.
又前述した様に、ボールペン軸がより細く長くなって
きたのでコアピンもより細く長くなり、成形品肉厚も薄
くなり、偏肉の影響が顕著に生じてきた。Further, as described above, since the ballpoint pen shaft has become thinner and longer, the core pin has become thinner and longer, the thickness of the molded product has become thinner, and the influence of uneven wall thickness has been remarkable.
（課題を解決するための手段） 本発明は上記問題点を解決することを目的とし、成形
すべき有底筒体の外面と同形の内面を有する雌金型キャ
ビテイ内に、成形すべき有底筒体の内面と同形の外面を
有する雄金型のコアピンを同軸に挿入し、キャビテイ開
口部側中心対称位置に設けられたゲートよりキャビテイ
とコアピン間の環状空隙部に湯を注入し、次第に有底筒
体底部に向って充填し、有底筒体底部細孔よりガスの湯
を排出する如くしたことを特徴とする。(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned problems, and to provide a bottomed mold to be molded in a female mold cavity having an inner surface having the same shape as the outer surface of a bottomed cylindrical body to be molded. A male mold core pin having the same outer surface as the inner surface of the cylindrical body is coaxially inserted, and hot water is injected into the annular gap between the cavity and the core pin from a gate provided at the center symmetrical position on the cavity opening side. The filling is performed toward the bottom of the bottom cylinder, and the hot water of gas is discharged from the bottom pores of the bottom cylinder.
（実施例） 第１図、第２図は本発明の第１実施例である。１は雌
金型で、キャビテイ２の内面は成形すべき有底筒体の外
面と同形になっている。４は雄金型より突設されたコア
ピンで、外面は成形すべき有底筒体の内面と同形の外面
を有している。雌金型１と雄金型３を閉じるとコアピン
４はキャビテイ２内に同軸に挿入され環状空隙５を形成
する。キャビテイ２の開口側外面部中心対称位置に２個
のサブマリンゲート６が形成され、キャビテイ２の底部
外面に形成した細孔７に接続して湯だまり８が形成さ
れ、該湯だまり８内にロックピン９が挿入されている。(Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention. Reference numeral 1 denotes a female mold, and the inner surface of the cavity 2 has the same shape as the outer surface of the bottomed cylindrical body to be molded. Reference numeral 4 denotes a core pin protruding from a male mold, and the outer surface has the same outer surface as the inner surface of the bottomed cylindrical body to be formed. When the female mold 1 and the male mold 3 are closed, the core pin 4 is coaxially inserted into the cavity 2 to form an annular gap 5. Two submarine gates 6 are formed at the center of the outer surface of the cavity 2 on the opening side, and connected to the pores 7 formed on the outer surface of the bottom of the cavity 2 to form a well 8, which is locked in the well 8. Pin 9 is inserted.
なお、サブマリンゲートはキャビテイ開口端より中間
部迄の間ならどこでもよい。The submarine gate may be anywhere between the cavity opening end and the middle.
次に作用について説明する。成形機のシリンダー内で
溶融された樹脂は雌金型１内のランナー17へ流れ込み、
両側の２個のサブマリンゲート６より環状空隙５内に注
入される。サブマリンゲート６は細く長いコアピン４の
基部付近両側に位置しており、コアピン４は剛性が高い
のでコアピン４基部より注入された樹脂の圧力でコアピ
ン４は傾くことなく保持され次第に成形すべき有底筒体
の底部へ流れる。その際、環状空隙５内にあった空気は
底部外面に形成した細孔７より湯だまり８へ流れ、該湯
だまり８を充填する。Next, the operation will be described. The resin melted in the cylinder of the molding machine flows into the runner 17 in the female mold 1,
It is injected into the annular space 5 from the two submarine gates 6 on both sides. The submarine gate 6 is located on both sides near the base of the thin and long core pin 4. Since the core pin 4 has high rigidity, the core pin 4 is held by the pressure of the resin injected from the base of the core pin 4 without tilting and has a bottom to be formed as soon as possible. Flows to the bottom of the cylinder. At this time, the air in the annular space 5 flows from the pores 7 formed on the outer surface of the bottom to the pool 8 and fills the pool 8.
次に雌金型１と雄金型３を開くとサブマリンゲート６
は成形品11より自動的に切断される。次いで上金型12が
開くと湯だまり８が成形品11底部外面より自動的に切断
される。次いで湯だまり８をロックしているロックピン
９が湯だまり８より抜けて湯だまり８が自動落下する。
次いで雌金型１より偏肉、曲がりのない成形品11が得ら
れる。Next, when the female mold 1 and the male mold 3 are opened, the submarine gate 6 is opened.
Is automatically cut from the molded product 11. Next, when the upper mold 12 is opened, the basin 8 is automatically cut from the outer surface of the bottom of the molded product 11. Next, the lock pin 9 that locks the basin 8 falls out of the basin 8 and the basin 8 falls automatically.
Next, a molded product 11 having no uneven thickness and no bending is obtained from the female mold 1.
外径10ミリ、長さ100ミリの成形品の場合、従来のピ
ンポイントゲートの径は0.6ミリ程必要であるが、本発
明の場合は0.2ミリ程度でよく、従って自動切断された
跡が目立たないので外観上美的である。In the case of a molded product with an outer diameter of 10 mm and a length of 100 mm, the diameter of the conventional pinpoint gate is required to be about 0.6 mm, but in the case of the present invention, it may be about 0.2 mm, and the trace of the automatic cutting is conspicuous. There is no aesthetic appearance.
第３図、第４図は本発明の第２実施例で、10は雌金
型、13は雄金型、14はコアピンでゲート16は環状空隙15
の開口端に形成されている。3 and 4 show a second embodiment of the present invention, in which 10 is a female mold, 13 is a male mold, 14 is a core pin, and a gate 16 is an annular space 15.
Is formed at the opening end of.
第５図は本発明の第３実施例で、20は雌金型、23は雄
金型、24はコアピンで、ゲート26はコアピン24側から環
状空隙25開口部近傍内側に形成されている。FIG. 5 shows a third embodiment of the present invention, in which 20 is a female mold, 23 is a male mold, 24 is a core pin, and the gate 26 is formed inside the vicinity of the opening of the annular gap 25 from the core pin 24 side.
第２、第３実施例共作用は第１実施例と同様である。 The synergy of the second and third embodiments is the same as that of the first embodiment.
（効 果） 本発明によると、成形すべき有底筒体の外面と同形の
内面を有する雌金型キャビテイ内に、成形すべき有底筒
体の内面と同形の外面を有する雄金型のコアピンを同軸
に挿入し、キャビテイ開口部側中心対称位置に設けられ
たゲートよりキャビテイとコアピン間の環状空隙部に湯
を注入し、次第に有底筒体底部に向って充填し、有底筒
体底部細孔よりガスと湯を排出してあるので、偏肉、曲
がりのない有底筒体を成形でき、かつ空気を抜く小孔を
従来のピンポイントゲートより小さくできるので跡目が
目立たず外観上美しく、細くて長いペン軸等に好適であ
る。(Effects) According to the present invention, a male mold having an outer surface having the same shape as the inner surface of the bottomed cylinder to be molded is placed in a female mold cavity having an inner surface having the same shape as the outer surface of the bottomed cylinder to be molded. The core pin is inserted coaxially, hot water is injected into the annular space between the cavity and the core pin from the gate provided at the center opening symmetrical position on the cavity opening side, and gradually filled toward the bottom of the bottomed cylindrical body. Since gas and hot water are discharged from the bottom pores, it is possible to form a bottomed cylindrical body without uneven thickness and bending, and the small holes for bleeding air can be made smaller than conventional pinpoint gates, so that marks are not noticeable and appearance It is suitable for a beautiful, thin and long pen shaft.
なお、ゲートはサブマリンゲートの他、サイドゲー
ト、フイルムゲート、デイスクゲートでもよく、成形品
の内面、外面どちらかに形成してもよい。In addition, the gate may be a side gate, a film gate, a disk gate other than the submarine gate, and may be formed on either the inner surface or the outer surface of the molded product.
第１図は本発明の第１実施例正断面図、第２図は第１実
施例により成形された成形品、サブマリンゲート、ラン
ナーの外観斜視図、第３図は本発明の第２実施例正断面
図、第４図は第２実施例の成形品とサイドゲートとラン
ナーの外観斜視図、第５図は本発明の第３実施例サブマ
リンゲート部正断面図、第６図は従来装置の正断面図、
第７図は従来装置によるショート不良の成形品外観斜視
図である。 1,10,20……雌金型 ２……キャビテイ 3,13,23……雄金型 4,14,24……コアピン 5,15,25……環状空隙 6,16,26……サブマリンゲート ７……細孔 ８……湯だまりFIG. 1 is a front sectional view of a first embodiment of the present invention, FIG. 2 is a perspective view of a molded product, a submarine gate, and a runner formed by the first embodiment, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a perspective view of the appearance of the molded product of the second embodiment, side gates and runners, FIG. 5 is a front sectional view of a submarine gate portion of the third embodiment of the present invention, and FIG. Front sectional view,
FIG. 7 is a perspective view of the appearance of a molded product having a short-circuit failure by the conventional apparatus. 1,10,20… Female mold 2… Cavity 3,13,23… Male mold 4,14,24… Core pin 5,15,25… Circular gap 6,16,26… Submarine gate 7 ... Pore 8 ... Puddle
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−25854（ＪＰ，Ａ) 特開 昭56−144135（ＪＰ，Ａ) 特開 昭58−179626（ＪＰ，Ａ) 実開 昭64−36122（ＪＰ，Ｕ) 実開 昭54−116273（ＪＰ，Ｕ) 実開 昭55−15016（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/26 - 45/44 B29C 33/00 - 33/76 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-25854 (JP, A) JP-A-56-144135 (JP, A) JP-A-58-179626 (JP, A) 36122 (JP, U) Japanese Utility Model Showa 54-116273 (JP, U) Japanese Utility Model Utility Model Showa 55-15016 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) B29C 45/26-45 / 44 B29C 33/00-33/76
Claims (1)
有する雌金型キャビテイ内に、成形すべき有底筒体の内
面と同形の外面を有する雄金型のコアピンを同軸に挿入
し、キャビテイ開口部側中心対称位置に設けられたゲー
トよりキャビテイとコアピン間の環状空隙部に湯を注入
し、次第に有底筒体底部に向って充填し、有底筒体底部
細孔よりガスと湯を排出する如くなした有底筒体の成形
方法。A core pin of a male mold having an outer surface of the same shape as the inner surface of a bottomed cylinder to be molded is coaxially mounted in a female mold cavity having an inner surface of the same shape as the outer surface of the bottomed cylinder to be molded. Hot water is injected into the annular gap between the cavity and the core pin from the gate provided at the center opening symmetrical position on the cavity opening side, and gradually filled toward the bottom of the bottomed cylindrical body. A method of forming a bottomed cylinder that discharges gas and hot water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25957790A JP2929692B2 (en) | 1990-09-28 | 1990-09-28 | Forming a bottomed cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25957790A JP2929692B2 (en) | 1990-09-28 | 1990-09-28 | Forming a bottomed cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04135820A JPH04135820A (en) | 1992-05-11 |
| JP2929692B2 true JP2929692B2 (en) | 1999-08-03 |
Family
ID=17336055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25957790A Expired - Lifetime JP2929692B2 (en) | 1990-09-28 | 1990-09-28 | Forming a bottomed cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2929692B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006106431A1 (en) * | 2005-04-06 | 2006-10-12 | Vacutest Kima S.R.L. | Injection moulding process for making laboratory test-tubes and mould to be used in the moulding process thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2129246C (en) * | 1992-03-27 | 1999-08-10 | William J. Kanewske Iii | Plastic assay cuvette having low birefringence |
| US8168099B2 (en) | 2005-04-06 | 2012-05-01 | Vacutest Kima S.R.L. | Injection molding process for making laboratory test-tubes and mold to be used in the molding process thereof |
| JP4953797B2 (en) * | 2006-02-03 | 2012-06-13 | 株式会社エンプラス | Molding method of resin products |
| WO2009044730A1 (en) * | 2007-10-05 | 2009-04-09 | Ngk Insulators, Ltd. | Shaping mold and method of shaping |
-
1990
- 1990-09-28 JP JP25957790A patent/JP2929692B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006106431A1 (en) * | 2005-04-06 | 2006-10-12 | Vacutest Kima S.R.L. | Injection moulding process for making laboratory test-tubes and mould to be used in the moulding process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04135820A (en) | 1992-05-11 |
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