JPH038932B2 - - Google Patents
Info
- Publication number
- JPH038932B2 JPH038932B2 JP60088072A JP8807285A JPH038932B2 JP H038932 B2 JPH038932 B2 JP H038932B2 JP 60088072 A JP60088072 A JP 60088072A JP 8807285 A JP8807285 A JP 8807285A JP H038932 B2 JPH038932 B2 JP H038932B2
- Authority
- JP
- Japan
- Prior art keywords
- gate
- small gear
- mold
- reservoir
- pinpoint gate
- 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
- 238000001746 injection moulding Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012805 post-processing 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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
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、金型を用いて小型歯車を射出成形す
る小型歯車射出成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small gear injection molding method for injection molding a small gear using a mold.
従来の小型歯車用金型のゲート構造は、第１図
に示すピンポイントゲートである。小型歯車のた
め、図中ａ寸法は小型歯車のため肉厚が薄く小さ
な値である。第２図も、従来のピーポイントゲー
トの構造を示し、ゲート部は製品に沈み込むので
ゲートボツは製品表面より出ないですむ。この機
構においても、ゲートランド部、図中のｂ寸法は
ゲート径プラスアルフアの寸法を必要とし、第１
図に示すようなａ寸法の小さい成形部品には適用
出来ない。第１図の成形品は、PL面よりゲート
ボツが出て、後加工にてゲートボツを取らねばな
らない欠点がある。また、歯車のような回転部品
は、中心軸に対しバランスが取れていなければな
らぬが、１点ゲート構造ではゲートのヒケにより
アンバランスとなり、多点ゲート構造を取ろうに
も、小型歯車のため、スプールが干渉し多点ゲー
トが取れない欠点を有していた。 The gate structure of the conventional mold for small gears is a pinpoint gate shown in FIG. Since it is a small gear, dimension a in the figure has a small value because the wall thickness is thin because it is a small gear. Figure 2 also shows the structure of a conventional peak point gate, and since the gate part sinks into the product, gate blemishes do not need to protrude from the product surface. In this mechanism as well, the gate land portion, dimension b in the figure, requires the gate diameter plus alpha, and the first
This method cannot be applied to molded parts with a small dimension a as shown in the figure. The molded product shown in Figure 1 has the disadvantage that gate blemishes appear from the PL surface and must be removed in post-processing. In addition, rotating parts such as gears must be balanced with respect to the central axis, but a single-point gate structure results in unbalance due to gate sink, and even if a multi-point gate structure is used, small gears Therefore, the spool interfered, making it impossible to obtain multi-point gates.
本発明はこのような欠点を解決しようとするも
ので、その目的とするところは、ゲート部のゲー
トボツを有しない、且つゲート部のヒケにより発
生する小型歯車の変形が回避できる小型歯車射出
成形方法を提供するところにある。 The present invention aims to solve these drawbacks, and its purpose is to provide a small gear injection molding method that does not have gate blemishes in the gate part and can avoid deformation of the small gear caused by sink marks in the gate part. It is located in a place that provides.
本発明の小型歯車射出成形方法は、固定側型板
にピンポイントゲートを設け、可動側型板には歯
形部を形成するための凹部と、前記凹部の中心に
小型歯車の軸穴を形成するための中心コアとを設
けてなる金型を用いて小型歯車を成形する小型歯
車射出成形方法において、前記中心コアは前記ピ
ンポイントゲートと対向する位置にスラツグ溜り
を設け、且つ前記スラツグ溜りから前記中心コア
内を貫通する放射状多点のサブマリンゲートを設
け、射出冷却を終了した後、型開きにより前記ピ
ンポイントゲートと前記スラツグ溜りとを切断
し、その後射出成形された前記小型歯車を前記型
開きの方向に移動させることにより前記サブマリ
ンゲートと前記小型歯車とを切断することを特徴
とする。 In the small gear injection molding method of the present invention, a pinpoint gate is provided on a stationary side template, and a recess for forming a tooth-shaped portion is formed on a movable side template, and a shaft hole for a small gear is formed in the center of the recess. A small gear injection molding method for molding a small gear using a mold provided with a central core for a purpose, wherein the center core is provided with a slug reservoir at a position facing the pinpoint gate, and the central core is provided with a slug reservoir at a position facing the pinpoint gate, and A radial multi-point submarine gate penetrating through the center core is provided, and after injection cooling is completed, the pinpoint gate and the slag reservoir are cut by opening the mold, and then the injection molded small gear is opened by opening the mold. The submarine gate and the small gear are cut by moving the small gear in the direction shown in FIG.
以下に本発明の実施例を図面に基づいて説明す
る。第３図は本発明の小型歯車射出成形方法に係
わる射出成形用金型の１実施例を示す要部断面図
である。第３図において金型を構成する固定側型
板１には歯車軸の中心にピンポイントゲートを設
け、可動側型板２の中心コアにスラツグ溜り８を
設け、その回りに放射状に並べた多点のサブマリ
ンゲート９を配し、中心コア５に突き出しピン６
を有している。 Embodiments of the present invention will be described below based on the drawings. FIG. 3 is a sectional view of a main part showing one embodiment of an injection molding die related to the small gear injection molding method of the present invention. In Fig. 3, a pinpoint gate is provided at the center of the gear shaft on the fixed side mold plate 1 constituting the mold, and a slug reservoir 8 is provided at the center core of the movable side mold plate 2, and a slug reservoir 8 is provided in the center core of the movable side mold plate 2. A point submarine gate 9 is arranged, and a protruding pin 6 is placed in the center core 5.
have.
次に上記実施例の作動につき説明する。射出、
冷却と終了すると、型開き時にピンポイントゲー
ト３とスラツグ溜り８が切られ、型開きは終了す
る。継いて除材に移ると、中心コア内にある突き
出しピン６と中心コアの外周に配置される突き出
しピン７が作動し、除材が行なわれる。中心コア
内にある突き出しピン６が作動すると、スラツグ
溜り８を押し出すと同時に、サブマリンゲート９
を切断し除材される。サブマリンゲート９は放射
状多点で中心コア内にあるため、ゲートのヒケが
均一化し、変形がなくなり、同時にゲートボツは
発生しない。 Next, the operation of the above embodiment will be explained. injection,
When the cooling is completed, the pinpoint gate 3 and the slag reservoir 8 are cut when the mold is opened, and the mold opening is completed. Next, when the material is removed, the ejector pin 6 inside the central core and the ejector pin 7 arranged around the outer periphery of the center core are operated, and the material is removed. When the ejector pin 6 in the center core operates, it pushes out the slag reservoir 8 and at the same time pushes out the submarine gate 9.
The material is cut and removed. Since the submarine gates 9 are located at multiple radial points within the central core, the sink marks on the gates are uniform, deformation is eliminated, and at the same time, gate defects do not occur.
第４図は本発明の小型歯車射出成形方法に係わ
る射出成形用金型の他の実施例を示す要部断面図
である。中心コア５を固定側型板１に押し切りし
た構造である。この構造を取れば、第３図の歯車
（射出成形品４）より歯巾が小さくて良く、又、
PL面のバリを軸方向に出すことが出来る。 FIG. 4 is a cross-sectional view of a main part showing another embodiment of an injection mold related to the small gear injection molding method of the present invention. It has a structure in which the central core 5 is pressed into the fixed side template 1. If this structure is adopted, the tooth width can be smaller than that of the gear shown in Fig. 3 (injection molded product 4), and
It is possible to remove burrs on the PL surface in the axial direction.
以上述べたように本発明によれば、固定側型板
に設けたピンポイントゲートと対向する位置にス
ラツグ溜りを設け、且つスラツグ溜りから貫通す
る放射状多点のサブマリンゲートを設けた中心コ
アを可動側型板に配設した金型を用いて、射出冷
却を終了した後、型開きによりピンポイントゲー
トとスラツグ溜りとを切断し、その後射出成形さ
れた小型歯車を型開きの方向に移動させることに
よりサブマリンゲートと小型歯車とを切断するよ
うに構成したので、ピンポイントゲート部のゲー
トボツはスラツグ溜りに形成され小型歯車とは切
断されてスラツグ溜りと共に除材されることか
ら、ゲートボツを有しない小型歯車が成形できる
という効果を有する。 As described above, according to the present invention, a slug reservoir is provided at a position facing the pinpoint gate provided on the fixed side template, and a central core provided with radial multi-point submarine gates penetrating from the slug reservoir is movable. After injection cooling is completed using a mold placed on the side mold plate, the pinpoint gate and slag reservoir are cut by opening the mold, and then the small injection molded gear is moved in the direction of opening the mold. Since the structure is configured to cut the submarine gate and the small gear, the gate hole in the pinpoint gate part is formed in the slug pool, and the small gear is cut off and removed together with the slug pool. It has the effect of being able to form gears.
また、小型歯車は射出成形時に放射状多点のサ
ブマリンゲートより充填されることから、例えば
１点ゲートタイプの型構造を用いた従来技術の小
型歯車射出成形方法と比較すれば、ゲート部のヒ
ケのバランスが著しく向上できることから、小型
歯車の変形を回避できる小型歯車射出成形方法が
提供できるという効果も有する。 In addition, since small gears are filled through multiple radial submarine gates during injection molding, there is less sinkage at the gate compared to conventional small gear injection molding methods that use a single gate type mold structure. Since the balance can be significantly improved, it also has the effect of providing a small gear injection molding method that can avoid deformation of the small gear.
第１図は従来の小型歯車用金型の断面図であ
り、第２図は従来のピンポイントゲート構造の断
面図であり、第３図は本発明の実施例を示す断面
図であり、第４図は本発明の他の実施例を示す断
面図である。
１……固定側型板、２……可動側型板、３……
スプール、４……射出成形品、５……中心コア、
６……中心コア内突き出しピン、７……突き出し
ピン、８……スラツグ溜り、９……サブマリンゲ
ート。
FIG. 1 is a sectional view of a conventional mold for small gears, FIG. 2 is a sectional view of a conventional pinpoint gate structure, and FIG. 3 is a sectional view showing an embodiment of the present invention. FIG. 4 is a sectional view showing another embodiment of the present invention. 1... Fixed side template, 2... Movable side template, 3...
Spool, 4... Injection molded product, 5... Center core,
6... Ejection pin in the center core, 7... Ejection pin, 8... Slug reservoir, 9... Submarine gate.
Claims (1)
動側型板には歯形部を形成するための凹部と、前
記凹部の中心に小型歯車の軸穴を形成するための
中心コアとを設けてなる金型を用いて小型歯車を
成形する小型歯車射出成形方法において、前記中
心コアは前記ピンポイントゲートと対向する位置
にスラツグ溜りを設け、且つ前記スラツグ溜りか
ら前記中心コア内を貫通する放射状多点のサブマ
リンゲートを設け、射出冷却を終了した後、型開
きにより前記ピンポイントゲートと前記スラツグ
溜りとを切断し、その後射出成形された前記小型
歯車を前記型開きの方向に移動させることにより
前記サブマリンゲートと前記小型歯車とを切断す
ることを特徴とする小型歯車射出成形方法。1 A fixed side mold plate is provided with a pinpoint gate, and a movable side mold plate is provided with a recessed portion for forming a tooth-shaped portion and a central core for forming a shaft hole of a small gear at the center of the recessed portion. In a small gear injection molding method of molding a small gear using a mold, the central core has a slug reservoir at a position facing the pinpoint gate, and a radial multi-point slug reservoir is provided at a position facing the pinpoint gate, and a slug reservoir is provided at a position facing the pinpoint gate, and a slug reservoir is provided at a position facing the pinpoint gate, and a radial multi-point slug reservoir is provided at a position facing the pinpoint gate. After injection cooling is completed, the pinpoint gate and the slag reservoir are cut off by opening the mold, and then the injection molded small gear is moved in the direction of the opening of the mold. A method for injection molding a small gear, comprising cutting a gate and the small gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60088072A JPS6110422A (en) | 1985-04-24 | 1985-04-24 | Injection molding method of pinion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60088072A JPS6110422A (en) | 1985-04-24 | 1985-04-24 | Injection molding method of pinion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6110422A JPS6110422A (en) | 1986-01-17 |
| JPH038932B2 true JPH038932B2 (en) | 1991-02-07 |
Family
ID=13932649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60088072A Granted JPS6110422A (en) | 1985-04-24 | 1985-04-24 | Injection molding method of pinion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6110422A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017203895A1 (en) * | 2016-05-26 | 2017-11-30 | 株式会社デンソー | Gear, gear transmission mechanism, and method for manufacturing gear |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2600938B1 (en) * | 1986-07-04 | 1989-10-06 | Nacryl Sa | PROCESS FOR INJECTION MOLDING ON THE GAP WITHIN AT LEAST ONE OF THE SPINDLES, HATCHERY OBJECTS AND MOLD FOR IMPLEMENTATION |
| US5423893A (en) * | 1992-06-18 | 1995-06-13 | Kotaki; Daizo | Plastic filter, its injection molding die and producing method |
| US5650181A (en) * | 1993-06-17 | 1997-07-22 | Kotaki; Daizo | Injection molding die for producing plastic filter |
| KR101036759B1 (en) * | 2010-05-20 | 2011-05-26 | 한국기계연구원 | Injection mold |
-
1985
- 1985-04-24 JP JP60088072A patent/JPS6110422A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017203895A1 (en) * | 2016-05-26 | 2017-11-30 | 株式会社デンソー | Gear, gear transmission mechanism, and method for manufacturing gear |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6110422A (en) | 1986-01-17 |
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