JP2007055100A - Method for manufacturing barrel with grip and barrel with grip manufactured by this method - Google Patents

Method for manufacturing barrel with grip and barrel with grip manufactured by this method Download PDF

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JP2007055100A
JP2007055100A JP2005243331A JP2005243331A JP2007055100A JP 2007055100 A JP2007055100 A JP 2007055100A JP 2005243331 A JP2005243331 A JP 2005243331A JP 2005243331 A JP2005243331 A JP 2005243331A JP 2007055100 A JP2007055100 A JP 2007055100A
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grip
core pin
cavity
mold
runner
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Yoshihiro Kobayashi
祥浩 小林
Hisao Yasuda
久雄 安田
Hiroyuki Saito
宏行 斉藤
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Pilot Corp
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Pilot Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, for manufacturing a barrel with a grip, which leaves no gate mark on the surface of a grip and can reduce the kind and number of core pins to be used during injection molding, with regard to a writing utensil with a grip of such a tapered shape that the holding part of the barrel extends forward from the rear, and a barrel with a grip manufactured by this method. <P>SOLUTION: In a molding process, a curable resin is poured into a gap between a first cavity and a core pin arranged in a movable half of a mold from a primary runner of a primary cavity half of the mold. Consequently, a barrel main body whose holding part is located on the movable half, is molded by opening an injection hole in the side of the holding part, and in a forming process, the elastic resin which is passed through a primary runner formed in a secondary cavity side half, a secondary runner formed in a secondary cavity and a subrunner formed in the core pin, is poured into a gap between the secondary cavity and the holding part of the barrel main body from an injection hole of the holding part. Thus the grip made of the elastic resin is molded on the surface of the holding part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、軸筒本体の把持部に射出成型機を用いた二色成形でグリップを成形する構造のグリップ付軸筒の製造方法およびその製造方法により製造したグリップ付軸筒に関する。   The present invention relates to a method of manufacturing a shaft cylinder with a grip having a structure in which a grip is formed by two-color molding using an injection molding machine at a grip portion of a shaft cylinder main body, and a shaft cylinder with a grip manufactured by the manufacturing method.

従来より、軸筒の把持部に弾性樹脂からなるグリップを設けて、筆記時の握り易さを向上させた構造の筆記具は良く知られている。この様な筆記具の軸筒を製造する場合において、最近では、一次成形で硬質樹脂により成形した軸筒本体に、一連の工程となる二次成形により軸筒本体の把持部に弾性樹脂からなるグリップを成形するいわゆる二色成形技術を用いた製造方法が多く採用されている。   2. Description of the Related Art Conventionally, a writing instrument having a structure in which a grip made of an elastic resin is provided at a grip portion of a shaft cylinder to improve gripping ease at the time of writing is well known. In the case of manufacturing such a writing tool shaft, recently, a shaft made of a hard resin in a primary molding, and a grip made of an elastic resin in a gripping portion of the shaft barrel main body by a secondary molding that is a series of steps. Many manufacturing methods using a so-called two-color molding technique for molding a material are employed.

従来における二色成形技術の一般的な構造を説明すると、例えば図６に示すように一次成形構造２１は、第一キャビティ２２と第一固定側金型２３と可動側金型２４と、該可動側金型２４に取付けた可動側コアピン２５と、第一固定側金型２３に取付けた第一固定側コアピン２６とを備え、第一キャビティ２２と可動側コアピン２５および第一固定側コアピン２６との隙間に、第一固定側金型２３に設けたランナ２７から硬質樹脂２８を流し込んで、軸筒本体２９を成形する構造である。   The general structure of the conventional two-color molding technique will be described. For example, as shown in FIG. 6, the primary molding structure 21 includes a first cavity 22, a first fixed-side mold 23, a movable-side mold 24, and the movable mold. The movable side core pin 25 attached to the side mold 24 and the first fixed side core pin 26 attached to the first fixed side mold 23 are provided, and the first cavity 22, the movable side core pin 25 and the first fixed side core pin 26 are provided. In this gap, a hard resin 28 is poured from a runner 27 provided on the first fixed mold 23 to mold the shaft main body 29.

また、図７に示すように二次成形構造３０では、第二キャビティ３１と第二固定側金型３２と前記可動側金型２４と、該可動側金型２４に取付けた可動側コアピン２５と第二固定側金型３２に取付けた第二固定側コアピン３３とを備え、可動側コアピン２５および第二固定側コアピン３３と第二キャビティ３１との隙間に、第二固定側コアピン３３に設けたサブランナ３３ａから弾性樹脂３４を流し込んで軸筒本体２９の把持部２９ａにグリップ３５を成形する構造である。尚、この様な構造においては、特開２００３−２５７８４号公報で開示されている様に、グリップの表面にゲート跡が残らない構造が好まれている。図７でもグリップを成形する際には、軸筒本体２９の把持部２９ａに設けた貫通孔２９ｂの内側から外側へ向けて弾性樹脂３４を射出することでグリップ３５の表面にゲート跡が残らないようにしてある。   Further, as shown in FIG. 7, in the secondary molding structure 30, the second cavity 31, the second fixed mold 32, the movable mold 24, and the movable core pin 25 attached to the movable mold 24 are provided. A second fixed-side core pin 33 attached to the second fixed-side mold 32, and provided in the second fixed-side core pin 33 in a gap between the movable-side core pin 25 and the second fixed-side core pin 33 and the second cavity 31. In this structure, the elastic resin 34 is poured from the sub-runner 33 a and the grip 35 is formed on the grip portion 29 a of the shaft tube main body 29. In such a structure, as disclosed in Japanese Patent Application Laid-Open No. 2003-25784, a structure that does not leave a gate mark on the surface of the grip is preferred. In FIG. 7, when the grip is formed, the gate mark is not left on the surface of the grip 35 by injecting the elastic resin 34 from the inside to the outside of the through hole 29 b provided in the grip portion 29 a of the shaft cylinder body 29. It is like that.

また、最近では、デザイン的にあるいは握りやすさを向上させるために、軸筒の把持部を後方から前方に向かって拡がるテーパー形状にすることが求められている。この場合、コアピンもテーパー部を有する必要があり、そのコアピンは成形後に軸筒本体から抜かねばいけないので、コアピンは軸筒本体の内部で分割構造としてある。前述した図６のコアピン２５とコアピン２６および図７のコアピン２５とコアピン３３も分割構造となっている。第一固定側コアピン２６はＴ１の区間を後方から前方に向かって拡がるテーパー部２６ａとしてある。第二固定側コアピン３３もＴ１の区間を軸筒本体２９の内側面に合わせて後方から前方に向かって拡がるテーパー部３５ａとしてある。   Further, recently, in order to improve the design or ease of gripping, it is required to make the grip portion of the shaft tube into a tapered shape that expands from the rear toward the front. In this case, the core pin also needs to have a tapered portion, and the core pin has to be pulled out from the shaft tube main body after molding. Therefore, the core pin has a divided structure inside the shaft tube main body. The core pin 25 and the core pin 26 shown in FIG. 6 and the core pin 25 and the core pin 33 shown in FIG. The first fixed-side core pin 26 has a section T1 as a tapered portion 26a that expands from the rear toward the front. The second fixed-side core pin 33 is also formed as a tapered portion 35 a that expands from the rear toward the front in accordance with the section of T <b> 1 with the inner surface of the shaft cylinder body 29.

特開２００３−２５７８４号JP 2003-25784 A

ところで、筆記具の軸筒は細いことから射出成形で使用するコアピンも細く耐久性に乏しく消耗品的な扱いとなるのだが、コアピンの製造コストは比較的高価である。特に前述したテーパー部を軸筒本体に設けると共にゲート跡を表に残さない構造にする場合には、固定側と可動側との合計で３種類のコアピンを使用することになり、コアピンに要する費用によって結果的に筆記具自体のコストアップを招いていた。   By the way, since the shaft tube of the writing instrument is thin, the core pin used in the injection molding is also thin and has low durability and is treated as a consumable. However, the manufacturing cost of the core pin is relatively high. In particular, when the tapered portion described above is provided on the shaft cylinder body and the gate trace is not left on the table, three types of core pins are used on the fixed side and the movable side, and the cost required for the core pins. As a result, the cost of the writing instrument itself was increased.

本発明はこうした事実に鑑み、軸筒の把持部が後方から前方に向かって拡がるテーパー形状であるグリップ付の筆記具を、グリップの表面にゲート跡がなく、射出成形時に使用するコアピンの種類および本数を少なくできる構造のグリップ付軸筒の製造方法およびその製造方法で製造したグリップ付軸筒を提供することを目的とする。   In view of these facts, the present invention has a writing instrument with a grip that has a tapered shape in which the gripping portion of the shaft cylinder expands from the rear to the front, and there are no gate marks on the surface of the grip, and the types and number of core pins used during injection molding. It is an object of the present invention to provide a method of manufacturing a shaft cylinder with a grip having a structure capable of reducing the number of shafts and a shaft cylinder with a grip manufactured by the manufacturing method.

本発明は、
「１．把持部が後方から前方に向かって拡がるテーパー形状である軸筒本体の該把持部に、弾性樹脂からなるグリップを射出成型機を用いて二色成形で成形する構造のグリップ付軸筒の製造方法であって、一次成形において、第一キャビティと可動側金型に配設したコアピンとの隙間に第一固定側金型の一次ランナより硬質樹脂を流し込むことにより、可動側金型側に把持部が位置する軸筒本体を該把持部の側面に射出孔を設けて成型し、二次成形において、第二キャビティと前記軸筒本体の把持部との隙間に第二固定側金型に設けた一次ランナと第二キャビティに設けた二次ランナおよび前記コアピンに設けたサブランナを通過した弾性樹脂を前記把持部の射出孔から流し込むことにより、該把持部の表面に弾性樹脂からなるグリップを成形する構造を特徴としたグリップ付軸筒の製造方法。
２．把持部が後方から前方に向かって拡がるテーパー形状である軸筒本体の該把持部に、弾性樹脂からなるグリップを射出成型機を用いて二色成形で成形する構造の製造方法により製造されたグリップ付軸筒であて、前記グリップ付軸筒が、一次成形において、第一キャビティと可動側金型に配設したコアピンとの隙間に第一固定側金型の一次ランナより硬質樹脂を流し込むことにより、可動側金型側に把持部が位置する軸筒本体を該把持部の側面に射出孔を設けて成型し、二次成形において、第二キャビティと前記軸筒本体の把持部との隙間に第二固定側金型に設けた一次ランナと第二キャビティに設けた二次ランナおよび前記コアピンに設けたサブランナを通過した弾性樹脂を前記把持部の射出孔から流し込むことにより、該把持部の表面に弾性樹脂からなるグリップを成形する構造を用いて製造したことを特徴とするグリップ付軸筒。」である。 The present invention
“1. Gripping shaft cylinder having a structure in which a grip made of an elastic resin is formed by two-color molding on the gripping part of the barrel main body having a tapered shape in which the gripping part expands from the rear to the front. In the primary molding, by moving hard resin from the primary runner of the first fixed side mold into the gap between the first cavity and the core pin disposed in the movable side mold, the movable mold side In the secondary molding, a second fixed-side mold is formed in the gap between the second cavity and the grip portion of the shaft tube body. A grip made of an elastic resin on the surface of the gripping part by pouring elastic resin that has passed through the primary runner provided on the second runner provided on the second cavity and the sub-runner provided on the core pin from the injection hole of the gripping part. Complete Manufacturing method of the barrel with grip characterized by structure.
2. A grip manufactured by a manufacturing method of a structure in which a grip made of an elastic resin is formed by two-color molding on an gripping portion of a shaft cylinder main body having a tapered shape in which a gripping portion extends from rear to front. In the primary molding, the shaft cylinder with the grip is formed by pouring hard resin from the primary runner of the first fixed side mold into the gap between the first cavity and the core pin disposed in the movable side mold. In the secondary molding, a shaft cylinder main body having a gripping portion located on the movable mold side is formed by providing an injection hole on a side surface of the gripping portion, and in a gap between the second cavity and the gripping portion of the shaft cylinder main body. A surface of the gripping portion is formed by pouring elastic resin that has passed through the primary runner provided in the second stationary mold, the secondary runner provided in the second cavity, and the subrunner provided in the core pin from the injection hole of the gripping portion. In Barrel with grip, characterized in that produced using the structure for forming a grip made of RESIN. Is.

本発明において軸筒本体の把持部に成形するグリップは、軸筒本体の外側面の全周を被覆する構造であっても、軸筒本体の外側面の一部に部分的に成形する構造であってもよい。またグリップは、軸筒本体に凹部を形成して埋設させても、あるいは軸筒本体の表面から***させてもよい。本発明におけるコアピンは、一次成形で使用するものと二次成形で使用するものとを兼用し、さらに二次成形において第二キャビティに設けた二次ランナと一次成形で成形した軸筒本体の射出孔とを接続するサブランナを設ける必要がある。また、コアピンの長さは、可動側金型から突出し軸筒本体の全長に渡り固定側金型の前端面まで延びる長さとする。また、一次成形において軸筒本体の把持部に設ける射出口は、二次成形においてコアピンに設けたサブランナより弾性樹脂が流れ込む位置に設ければよく、形状は把持部を貫通する貫通孔や切欠とすればよい。尚、一次成型においては、コアピンに設けたサブランナの両端の開口部を第一キャビティと固定側金型の内面とで塞ぎ、一次ランナから流れてくる硬質樹脂がサブランナ内に入り込まないようにする必要がある。軸筒本体を成形する硬質樹脂としては、ポリカーボネート、ポリプロピレン、ポリエチレン、ポリスチレン、ＡＳ樹脂、ＡＢＳ樹脂等を使用することができる。また、グリップを成形する弾性樹脂としては、シリコン樹脂やエラストマー樹脂等を使用することができる。   In the present invention, the grip formed on the grip portion of the shaft tube main body has a structure in which it is partially formed on a part of the outer surface of the shaft tube main body, even if it covers the entire circumference of the outer surface of the shaft tube main body. There may be. Further, the grip may be embedded in the shaft tube main body by forming a recess, or may be raised from the surface of the shaft tube main body. The core pin in the present invention is used for both primary molding and secondary molding, and in addition, the secondary runner provided in the second cavity in the secondary molding and the injection of the shaft body formed by the primary molding. It is necessary to provide a subrunner that connects the hole. The length of the core pin is a length that protrudes from the movable mold and extends to the front end surface of the fixed mold over the entire length of the shaft cylinder body. In addition, the injection port provided in the gripping portion of the shaft cylinder body in the primary molding may be provided at a position where the elastic resin flows from the sub-runner provided in the core pin in the secondary molding, and the shape is a through hole or notch penetrating the gripping portion. do it. In primary molding, it is necessary to close the openings at both ends of the sub runner provided in the core pin with the first cavity and the inner surface of the fixed mold so that the hard resin flowing from the primary runner does not enter the sub runner. There is. Polycarbonate, polypropylene, polyethylene, polystyrene, AS resin, ABS resin, etc. can be used as the hard resin for forming the shaft cylinder body. In addition, as the elastic resin for forming the grip, a silicon resin, an elastomer resin, or the like can be used.

本発明によれば、軸筒の把持部が後方から前方に向かって拡がるテーパー形状であるグリップ付筆記具が、グリップの表面にゲート跡が残らず、且つ１種類のコアピンにて成型することができるので、コアピンに掛ける費用を削減し結果的に安価な筆記具が提供できるものとなる。   According to the present invention, the writing instrument with a grip having a tapered shape in which the grip portion of the shaft cylinder expands from the rear toward the front can be molded with one kind of core pin without leaving a gate mark on the surface of the grip. Therefore, the cost applied to the core pin can be reduced, and as a result, an inexpensive writing instrument can be provided.

次に図面を参照しながら、本発明のグリップ付き筆記具用軸筒の製造方法およびその製造方法により製造したグリップ付軸筒の実施の形態例について説明するが、本発明は以下の実施例に限定されるものではない。本実施の形態例では、軸筒本体を成形する硬質樹脂はポリカーボネートとし、グリップを成形する弾性樹脂はシリコンゴムとしてある。また、本実施の形態例では、説明を理解しやすくするために軸筒の把持部が位置する側を前方と表現し、その反対側を後方と表現する。   Next, while referring to the drawings, description will be given of an embodiment of a method of manufacturing a shaft cylinder for a writing instrument with a grip according to the present invention and a shaft cylinder with a grip manufactured by the manufacturing method, but the present invention is limited to the following examples. Is not to be done. In the present embodiment, the hard resin for molding the shaft cylinder body is polycarbonate, and the elastic resin for molding the grip is silicon rubber. Further, in this embodiment, in order to facilitate understanding of the description, the side on which the grip portion of the shaft tube is located is expressed as the front, and the opposite side is expressed as the rear.

図１は、本発明の製造方法の一次成形における概念図である。図に示すように、一次成形構造１では、第一キャビティ２と可動側金型３に配設したコアピン４との隙間に、第一固定側金型５に設けた一次ランナ５ａより硬質樹脂６を流し込んで、軸筒本体７を成形している。コアピン４は、軸筒本体７の把持部７ａに位置するＴ１の区間を後方から前方に向かって拡がるテーパー形状としてある。次に図２を用いて本実施の形態例のコアピンの説明を行う。図２はコアピンを上方から見た平面図である。コアピン４は、Ｓ１の区間がストレート部４ａでＴ１の区間がテーパー部４ｂであり、テーパー部４ｂから先のＵ１の区間はストレート部４ｃとなっている。テーパー部４ｂとストレート部４ｃの境目には二次成形時に使用するサブランナ４ｄを穿孔してある。サブランナ４ｄは長円形の受部４ｅと円形のゲート部４ｆとを設けてある。   FIG. 1 is a conceptual diagram in the primary molding of the production method of the present invention. As shown in the figure, in the primary molding structure 1, a hard resin 6 is provided in the gap between the first cavity 2 and the core pin 4 disposed in the movable mold 3 than the primary runner 5 a provided in the first fixed mold 5. The shaft cylinder main body 7 is molded. The core pin 4 has a tapered shape that extends from the rear toward the front in a section T <b> 1 located in the grip portion 7 a of the shaft body 7. Next, the core pin of the present embodiment will be described with reference to FIG. FIG. 2 is a plan view of the core pin as viewed from above. As for the core pin 4, the section of S1 is the straight part 4a, the section of T1 is the taper part 4b, and the section of U1 ahead of the taper part 4b is the straight part 4c. A sub-runner 4d used at the time of secondary molding is perforated at the boundary between the tapered portion 4b and the straight portion 4c. The sub-runner 4d is provided with an oval receiving portion 4e and a circular gate portion 4f.

図１に示すように、第一キャビティ２は、軸筒本体７の把持部７ａに位置する部分に、小径部２ａを設けてある。その小径部２ａは、コアピン４のテーパー部４ｂ（図２参照）に沿って後方から前方に向かって拡がるテーパー形状としてある。したがって成形される軸筒本体７は、把持部７ａが後方部７ｂより一段凹み、さらに外側面と内側面のいずれもが、後方から前方に向かって拡がるテーパー形状となる。また、第一キャビティ２は、軸筒本体７の把持部７ａの側面に射出孔７ｃを形成するように、突起部２ｂを設けてある。該突起部２ｂの先端は、コアピン４に形成したサブランナ４ｄのゲート部４ｆを塞ぐ構造である。尚、コアピン４は、軸筒本体７を貫通する全長で、先端が第一固定側金型５の前端面に当接し、可動側金型３に対して摺動可能に配設したコアピンスリーブ８の内部に摺動可能に配設してある。尚、コアピン４の上方には、可動側金型３に固設したイジェクタスリーブ９に対して摺動可能に配設したイジェクタ１０を設けてある。   As shown in FIG. 1, the first cavity 2 is provided with a small-diameter portion 2 a at a portion located in the grip portion 7 a of the shaft cylinder body 7. The small-diameter portion 2a has a tapered shape that expands from the rear toward the front along the tapered portion 4b (see FIG. 2) of the core pin 4. Therefore, the molded barrel body 7 has a tapered shape in which the grip portion 7a is recessed by one step from the rear portion 7b, and both the outer surface and the inner surface expand from the rear toward the front. Further, the first cavity 2 is provided with a protruding portion 2b so as to form an injection hole 7c on the side surface of the grip portion 7a of the shaft cylinder body 7. The tip of the protruding portion 2 b has a structure that closes the gate portion 4 f of the sub runner 4 d formed on the core pin 4. The core pin 4 has a full length penetrating the shaft cylinder body 7, a tip abuts against the front end surface of the first fixed mold 5, and a core pin sleeve 8 that is slidably disposed on the movable mold 3. Is slidably disposed in the interior. Note that an ejector 10 is provided above the core pin 4 so as to be slidable with respect to an ejector sleeve 9 fixed to the movable mold 3.

図３は、本発明の製造方法の二次成形における概念図である。図に示すように、二次成形構造１１では、第二キャビティ１２と前述の一次成形で使用したコアピン４に挿着したままの軸筒本体７の把持部７ａとの隙間に、第二固定側金型１３と第二キャビティ１２とに形成した二次ランナ１４より弾性樹脂１５を流し込んで、グリップ１６を成形している。弾性樹脂１５は二次ランナ１４を通った後に、コアピン４のサブランナ４ｄの受部４ｅに入り、ゲート部４ｆより射出孔７ｃに入って隙間に流れ込み、グリップ１６を軸筒本体７の把持部７ａに成形する構造である。この時、弾性樹脂１５の一部は可動側金型８のイジェクタスリーブ９内に入り込んで保持される。   FIG. 3 is a conceptual diagram in secondary forming of the manufacturing method of the present invention. As shown in the figure, in the secondary molding structure 11, the second fixed side is formed in the gap between the second cavity 12 and the gripping portion 7a of the shaft cylinder body 7 that is still inserted into the core pin 4 used in the primary molding described above. An elastic resin 15 is poured from a secondary runner 14 formed in the mold 13 and the second cavity 12 to mold the grip 16. After passing through the secondary runner 14, the elastic resin 15 enters the receiving portion 4 e of the sub-runner 4 d of the core pin 4, enters the injection hole 7 c through the gate portion 4 f and flows into the gap, and the grip 16 is held by the gripping portion 7 a of the shaft cylinder body 7. This is a structure to be molded. At this time, a part of the elastic resin 15 enters and is held in the ejector sleeve 9 of the movable mold 8.

図４は、二色成形した後に、コアピンを後方へ摺動させた状態の図である。図に示すように、二次成形にて成形されたグリップ１６は、ランナ１７として残った弾性樹脂１５のゲート部１７ａから切り離される。この状態でランナ１７は先端がイジェクタスリーブ９に保持されている。図５は、図４の状態の後に、コアピンスリーブおよびイジェクタを後方へ摺動させた状態の図である。図に示すように、完成されたグリップ付の軸筒１８は、コアピンスリーブ８に押されてコアピン４から抜け、ランナ１７はイジェクタ１０に押されてイジェクタスリーブ９から抜ける。   FIG. 4 is a view showing a state in which the core pin is slid rearward after two-color molding. As shown in the drawing, the grip 16 formed by secondary molding is separated from the gate portion 17 a of the elastic resin 15 remaining as the runner 17. In this state, the end of the runner 17 is held by the ejector sleeve 9. FIG. 5 is a view of a state in which the core pin sleeve and the ejector are slid rearward after the state of FIG. 4. As shown in the drawing, the completed shaft cylinder 18 with a grip is pushed out of the core pin 4 by the core pin sleeve 8, and the runner 17 is pushed out of the ejector sleeve 9 by being pushed by the ejector 10.

本発明のグリップ付き筆記具用軸筒の製造方法およびその製造方法により製造したグリップ付軸筒は、筆記具の軸筒のみならず、グリップを軸筒本体の表面に成形する構造の塗布具、文房具、化粧具等の軸筒部材に用いることができる。
The manufacturing method of the shaft cylinder for the writing instrument with the grip of the present invention and the shaft cylinder with the grip manufactured by the manufacturing method are not only the shaft cylinder of the writing instrument, but also the applicator, stationery, It can be used for a shaft tube member such as a cosmetic tool.

本発明の製造方法の一次成形における概念図。The conceptual diagram in the primary shaping | molding of the manufacturing method of this invention. コアピンを上方から見た平面図。The top view which looked at the core pin from the upper part. 本発明の製造方法の二次成形における概念図。The conceptual diagram in the secondary shaping | molding of the manufacturing method of this invention. コアピンを後方へ摺動させた状態の図。The figure of the state which made the core pin slide back. コアピンスリーブおよびイジェクタを後方へ摺動させた状態の図。The figure of the state which made the core pin sleeve and the ejector slide back. 従来の製造方法の一次成形における概念図。The conceptual diagram in the primary shaping | molding of the conventional manufacturing method. 従来の製造方法の二次成形における概念図。The conceptual diagram in the secondary shaping | molding of the conventional manufacturing method.

符号の説明Explanation of symbols

１…一次成形構造、２…第一キャビティ、２ｂ…突起部、
３…可動側金型、
４…コアピン、４ａ…ストレート部、４ｂ…テーパー部、４ｃ…ストレート部、
４ｄ…サブランナ、４ｅ…受部、４ｆ…ゲート部、
５…第一固定側金型、５ａ…一次ランナ、６…硬質樹脂、
７…軸筒本体７、７ａ…把持部、７ｂ…後方部、７ｃ…射出孔、
８…コアピンスリーブ、９…イジェクタスリーブ、１０…イジェクタ、
１１…二次成形構造、１２…第二キャビティ、１３…第二固定側金型、
１４…二次ランナ、１５…弾性樹脂、１６…グリップ、
１７…ランナ、１７ａ…ゲート部、１８…軸筒。

DESCRIPTION OF SYMBOLS 1 ... Primary molding structure, 2 ... 1st cavity, 2b ... Projection part,
3 ... movable side mold,
4 ... core pin, 4a ... straight part, 4b ... taper part, 4c ... straight part,
4d ... sub runner, 4e ... receiving part, 4f ... gate part,
5 ... First fixed side mold, 5a ... Primary runner, 6 ... Hard resin,
7 ... Shaft cylinder body 7, 7a ... Grasping part, 7b ... Back part, 7c ... Injection hole,
8 ... Core pin sleeve, 9 ... Ejector sleeve, 10 ... Ejector,
11 ... Secondary molding structure, 12 ... Second cavity, 13 ... Second stationary mold,
14 ... secondary runner, 15 ... elastic resin, 16 ... grip,
17 ... runner, 17a ... gate part, 18 ... shaft cylinder.

Claims (2)

把持部が後方から前方に向かって拡がるテーパー形状である軸筒本体の該把持部に、弾性樹脂からなるグリップを射出成型機を用いて二色成形で成形する構造のグリップ付軸筒の製造方法であって、一次成形において、第一キャビティと可動側金型に配設したコアピンとの隙間に第一固定側金型の一次ランナより硬質樹脂を流し込むことにより、可動側金型側に把持部が位置する軸筒本体を該把持部の側面に射出孔を設けて成型し、二次成形において、第二キャビティと前記軸筒本体の把持部との隙間に第二固定側金型に設けた一次ランナと第二キャビティに設けた二次ランナおよび前記コアピンに設けたサブランナを通過した弾性樹脂を前記把持部の射出孔から流し込むことにより、該把持部の表面に弾性樹脂からなるグリップを成形する構造を特徴としたグリップ付軸筒の製造方法。 A method of manufacturing a shaft cylinder with a grip having a structure in which a grip made of an elastic resin is formed by two-color molding on the gripping portion of the shaft tube main body having a tapered shape in which the gripping portion expands from the rear to the front In primary molding, a hard resin is poured into the gap between the first cavity and the core pin disposed in the movable mold from the primary runner of the first fixed mold, thereby holding the grip portion on the movable mold side. In the secondary molding, a second fixed-side mold is provided in the gap between the second cavity and the grip portion of the shaft tube main body. The elastic resin that has passed through the primary runner and the secondary runner provided in the second cavity and the sub-runner provided in the core pin is poured from the injection hole of the grip portion, thereby forming a grip made of the elastic resin on the surface of the grip portion. Method for producing Grip barrel which was characterized by forming. 把持部が後方から前方に向かって拡がるテーパー形状である軸筒本体の該把持部に、弾性樹脂からなるグリップを射出成型機を用いて二色成形で成形する構造の製造方法により製造されたグリップ付軸筒であて、前記グリップ付軸筒が、一次成形において、第一キャビティと可動側金型に配設したコアピンとの隙間に第一固定側金型の一次ランナより硬質樹脂を流し込むことにより、可動側金型側に把持部が位置する軸筒本体を該把持部の側面に射出孔を設けて成型し、二次成形において、第二キャビティと前記軸筒本体の把持部との隙間に第二固定側金型に設けた一次ランナと第二キャビティに設けた二次ランナおよび前記コアピンに設けたサブランナを通過した弾性樹脂を前記把持部の射出孔から流し込むことにより、該把持部の表面に弾性樹脂からなるグリップを成形する構造を用いて製造したことを特徴とするグリップ付軸筒。 A grip manufactured by a manufacturing method of a structure in which a grip made of an elastic resin is formed by two-color molding on an gripping portion of a shaft cylinder main body having a tapered shape in which a gripping portion extends from rear to front. In the primary molding, the shaft cylinder with the grip is formed by pouring hard resin from the primary runner of the first fixed side mold into the gap between the first cavity and the core pin disposed in the movable side mold. In the secondary molding, a shaft cylinder main body having a gripping portion located on the movable mold side is formed by providing an injection hole on a side surface of the gripping portion, and in a gap between the second cavity and the gripping portion of the shaft cylinder main body. A surface of the gripping portion is formed by pouring elastic resin that has passed through the primary runner provided in the second stationary mold, the secondary runner provided in the second cavity, and the subrunner provided in the core pin from the injection hole of the gripping portion. In Barrel with grip, characterized in that produced using the structure for forming a grip made of RESIN.
JP2005243331A 2005-08-24 2005-08-24 Method for manufacturing barrel with grip and barrel with grip manufactured by this method Pending JP2007055100A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014043077A (en) * 2012-08-28 2014-03-13 Mitsubishi Pencil Co Ltd Molding method of shaft cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014043077A (en) * 2012-08-28 2014-03-13 Mitsubishi Pencil Co Ltd Molding method of shaft cylinder

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