JP2730309B2 - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JP2730309B2 JP2730309B2 JP3062178A JP6217891A JP2730309B2 JP 2730309 B2 JP2730309 B2 JP 2730309B2 JP 3062178 A JP3062178 A JP 3062178A JP 6217891 A JP6217891 A JP 6217891A JP 2730309 B2 JP2730309 B2 JP 2730309B2
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- valve
- temperature
- gate
- mounting hole
- 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 - Fee Related
Links
- 238000002347 injection Methods 0.000 title claims description 7
- 239000007924 injection Substances 0.000 title claims description 7
- 239000011347 resin Substances 0.000 claims description 27
- 229920005989 resin Polymers 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 125000006850 spacer group Chemical group 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
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
-
- 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
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
- B29C2045/2855—Closure devices therefor consisting of needle valve systems intersecting the nozzle or runner channel
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
【０００１】[0001]
【産業上の利用分野】本発明は、ゲートを開閉するバル
ブピン（可動ロッド）を備えた、いわゆるバルブゲート
方式の射出成形金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called valve gate type injection mold having a valve pin (movable rod) for opening and closing a gate.
【０００２】[0002]
【従来の技術】従来、この種の射出成形金型としては、
固定型板と可動型板との間にキャビティが形成され、固
定型板内にゲートを経て上記キャビティに連通する樹脂
通路を備えたブッシュが設けられ、かつこのブッシュの
先端部の外周にヒータが装着されると共に、上記樹脂通
路内に軸方向に移動可能に可動ロッドが配置される一
方、この可動ロッドの先端で上記ゲートを開閉する構成
のものが知られている。2. Description of the Related Art Conventionally, injection molding dies of this kind include:
A cavity is formed between the fixed mold plate and the movable mold plate, a bush having a resin passage communicating with the cavity via a gate is provided in the fixed mold plate, and a heater is provided on an outer periphery of a tip portion of the bush. There is known a configuration in which a movable rod is mounted so as to be movable in the axial direction in the resin passage while being opened and closed by the tip of the movable rod.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記のよう
に構成された射出成形金型にあっては、ブッシュの内部
の樹脂通路内を可動ロッドが往復移動するために、ヒー
タをブッシュの外周に取付けなければならない（外部加
熱方式）。従って、ヒータの熱が外方に逃げ易く、ブッ
シュ内の溶融樹脂を効率良く加熱することができない上
に、ブッシュ全体を均一に加温することが難しく、温度
分布にバラツキが生じ易いという問題がある。By the way, in the injection mold having the above-mentioned construction, a heater is attached to the outer periphery of the bush because the movable rod reciprocates in the resin passage inside the bush. Must be installed (external heating method). Therefore, the heat of the heater easily escapes outward, the molten resin in the bush cannot be efficiently heated, and it is difficult to uniformly heat the entire bush, and the temperature distribution tends to vary. is there.
【０００４】本発明は、上記事情に鑑みてなされたもの
で、その目的をするところは、バルブ本体内の樹脂通路
を流通する溶融樹脂の温度を均一にかつ所定の値に保持
することができ、かつ温度効率が極めて良好な射出成形
金型を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to maintain the temperature of a molten resin flowing through a resin passage in a valve body uniformly and at a predetermined value. Another object of the present invention is to provide an injection mold having extremely good temperature efficiency.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、一対の型板間にキャビティが形成され、
一方の型板内にバルブ本体が設けられ、かつこのバルブ
本体に、バルブ本体を貫通してゲートを開閉するバルブ
ピンが、その軸線方向に移動可能に設けられると共に、
上記バルブ本体のバルブピン装着孔を避けて上記ゲート
部においてバルブピン装着孔に連通する樹脂通路が、上
記バルブ本体内に設けられる一方、上記バルブ本体には
樹脂を加熱するヒータとバルブ本体の温度を検知する温
度センサが内蔵されたものである。In order to achieve the above object, the present invention provides a method comprising forming a cavity between a pair of mold plates,
A valve body is provided in one template, and a valve pin that opens and closes a gate through the valve body is provided on the valve body so as to be movable in the axial direction thereof,
A resin passage communicating with the valve pin mounting hole in the gate portion avoiding the valve pin mounting hole of the valve body is provided in the valve body, while the valve body has
Temperature for detecting the temperature of the heater that heats the resin and the valve body
It has a built-in degree sensor .
【０００６】[0006]
【作用】本発明の射出成形金型にあっては、バルブ本体
内に設けられた樹脂通路の先端部（ゲート部）を、バル
ブピンの往復運動によって開閉すると共に、バルブ本体
に内蔵されたヒータによって上記樹脂通路を効果的に加
熱する。さらに、温度センサによってバルブ本体の温度
を検知し、これに基づいてヒータの温度制御を行う。 In the injection mold of the present invention, the tip (gate) of the resin passage provided in the valve body is opened and closed by the reciprocating motion of the valve pin, and is heated by the heater built in the valve body. The resin passage is effectively heated. In addition, the temperature of the valve body is
Is detected, and the temperature of the heater is controlled based on this.
【０００７】[0007]
【実施例】以下、図１と図２に基づいて本発明の一実施
例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【０００８】これらの図において符号１は固定型板であ
り、この固定型板１に対して可動型板（図示せず）が接
近、離間自在に設けられていると共に、これらの型板間
には、成形品形状をなすキャビティ２が形成されてい
る。そして、上記固定型板１には図示されていないが、
第１，第２固定受板、スペーサブロックを介して固定取
付板が取付けられており、第２固定受板と固定取付板と
の間にはマニホールドが設置されている。また、上記第
２，第１固定受板及び固定型板１の内部には、バルブ本
体３が装着されており、このバルブ本体３の中心部に
は、軸線方向に移動自在なバルブピン４を装着するピン
装着孔５が形成されている。そして、上記バルブ本体３
内には、上記ピン装着孔５を避けて、ピン装着孔５に平
行な樹脂通路６のストレート部６ａが形成されており、
このストレート部６ａの先端には、ストレート部６ａに
斜めに傾斜して連通する傾斜部６ｂが形成されている。
さらに、上記傾斜部６ｂの一端は、上記ピン装着孔５に
連通されており、かつ傾斜部６ｂの他端は、バルブ本体
３の外周に開口されている。そして、この傾斜部６ｂの
外部への開口部は、バルブ本体３に焼バメによって装着
された筒状部材７によって閉塞されている。In these figures, reference numeral 1 denotes a fixed mold plate, and a movable mold plate (not shown) is provided so as to be able to approach and separate from the fixed mold plate 1 and between these mold plates. Has a cavity 2 in the shape of a molded product. Although not shown in the fixed mold plate 1,
A fixed mounting plate is mounted via first and second fixed receiving plates and a spacer block, and a manifold is provided between the second fixed receiving plate and the fixed mounting plate. A valve body 3 is mounted inside the second and first fixed receiving plates and the fixed mold plate 1, and a valve pin 4 which is movable in the axial direction is mounted at the center of the valve body 3. A pin mounting hole 5 is formed. And the valve body 3
A straight portion 6a of the resin passage 6 parallel to the pin mounting hole 5 is formed in the inside, avoiding the pin mounting hole 5,
At the tip of the straight portion 6a, an inclined portion 6b is formed which is obliquely communicated with the straight portion 6a.
Further, one end of the inclined portion 6b communicates with the pin mounting hole 5, and the other end of the inclined portion 6b is opened on the outer periphery of the valve body 3. The opening to the outside of the inclined portion 6b is closed by a tubular member 7 attached to the valve body 3 by shrinkage fitting.
【０００９】上記バルブ本体３の軸線を中心にして上記
樹脂通路６のストレート部６ａと点対称な位置には、温
度センサ８が装着されており、かつこれらの樹脂通路６
のストレート部６ａ及び温度センサ８の軸線を結んだ面
に対して直交する位置には、一対のカートリッジヒータ
９が装着されている。また、上記バルブ本体３の先端部
と対向する固定型板１には、漏斗状のゲートブッシュ１
０が装着されており、上記マニホールドの内部，バルブ
本体３内の樹脂通路６，ゲートブッシュ１０の内部を通
って、溶融樹脂がキャビティ２に供給されるようになっ
ている。A temperature sensor 8 is mounted at a position symmetrical with respect to the straight portion 6a of the resin passage 6 about the axis of the valve body 3, and these resin passages 6 are provided.
A pair of cartridge heaters 9 is mounted at a position orthogonal to a plane connecting the straight portion 6a and the axis of the temperature sensor 8. A funnel-shaped gate bush 1 is provided on the fixed mold plate 1 facing the tip of the valve body 3.
The molten resin is supplied to the cavity 2 through the inside of the manifold, the resin passage 6 in the valve body 3, and the gate bush 10.
【００１０】上記のように構成された射出成形金型にあ
っては、バルブ本体３のピン装着孔５に装着されたバル
ブピン４を、その軸線に沿って移動させることにより、
バルブピン４の先端部によってゲート（ゲートブッシュ
１０の先端内部）の開閉操作を行う。In the injection mold having the above-described structure, the valve pin 4 mounted in the pin mounting hole 5 of the valve body 3 is moved along the axis of the valve.
The gate (the inside of the tip of the gate bush 10) is opened and closed by the tip of the valve pin 4.
【００１１】この場合、バルブ本体３の樹脂通路６内の
溶融樹脂は、バルブ本体３に内蔵された一対のカートリ
ッジヒータ９によって加熱され、かつ同じくバルブ本体
３内に装着された温度センサ８によって、温度が検知さ
れ、これに基づいて、上記各カートリッジヒータ９の温
度制御が行なわれる。従って、ゲートブッシュ１０を介
してキャビティ２内に供給される溶融樹脂の温度を常に
一定に保つことができ、一度に多数個取りした場合及び
繰り返し製品を成形した場合に、製品間のバラツキを防
げ、良好な品質の製品が得られる。In this case, the molten resin in the resin passage 6 of the valve body 3 is heated by a pair of cartridge heaters 9 built in the valve body 3, and is heated by a temperature sensor 8 also mounted in the valve body 3. The temperature is detected, and the temperature of each cartridge heater 9 is controlled based on the detected temperature. Therefore, the temperature of the molten resin supplied into the cavity 2 via the gate bush 10 can be always kept constant, and the variation between products can be prevented when a large number of products are taken at once or when products are molded repeatedly. , Good quality products are obtained.
【００１２】[0012]
【発明の効果】以上説明したように、本発明は、一対の
型板間にキャビティが形成され、一方の型板内にバルブ
本体が設けられ、かつこのバルブ本体に、バルブ本体を
貫通してゲートを開閉するバルブピンが、その軸線方向
に移動可能に設けられると共に、上記バルブ本体のバル
ブピン装着孔を避けて上記ゲート部においてバルブピン
装着孔に連通する樹脂通路が、上記バルブ本体内に設け
られる一方、上記バルブ本体には樹脂を加熱するヒータ
とバルブ本体の温度を検知する温度センサが内蔵された
ものであるから、バルブ本体内に設けられた樹脂通路の
先端部（ゲート部）を、バルブピンの往復運動によって
開閉すると共に、バルブ本体に内蔵されたヒータによっ
て上記樹脂通路を加熱し、さらに温度センサによってバ
ルブ本体の温度を検知しこれに基づいてヒータの温度制
御を行うことにより、バルブ本体内の樹脂通路を流通す
る溶融樹脂の温度を均一にかつ所定の値に保持すること
ができ、品質の良好な製品を得ることができる。As described above, according to the present invention, a cavity is formed between a pair of mold plates, a valve body is provided in one of the mold plates, and the valve body passes through the valve body. A valve pin for opening and closing the gate is provided so as to be movable in the axial direction thereof, and a resin passage communicating with the valve pin mounting hole in the gate portion avoiding the valve pin mounting hole of the valve body is provided in the valve body. A heater for heating the resin in the valve body
And a temperature sensor that detects the temperature of the valve body
Therefore, the tip end (gate portion) of the resin passage provided in the valve body is opened and closed by the reciprocating motion of the valve pin, and the resin passage is heated by a heater built in the valve body. By ba
The temperature of the lube body is detected and the heater temperature is controlled based on this.
By controlling the temperature, the temperature of the molten resin flowing through the resin passage in the valve body can be kept uniform and at a predetermined value, and a good quality product can be obtained.
【図１】本発明の一実施例を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.
【図２】図１の横断面図である。FIG. 2 is a cross-sectional view of FIG.
１ 固定型板 ２ キャビティ ３ バルブ本体 ４ バルブピン ５ ピン装着孔 ６ 樹脂通路 ９ カートリッジヒータ １０ ゲートブッシュ DESCRIPTION OF SYMBOLS 1 Fixed mold plate 2 Cavity 3 Valve body 4 Valve pin 5 Pin mounting hole 6 Resin passage 9 Cartridge heater 10 Gate bush
Claims (1)
一方の型板内にバルブ本体が設けられ、かつこのバルブ
本体に、バルブ本体を貫通してゲートを開閉するバルブ
ピンが、その軸線方向に移動可能に設けられると共に、
上記バルブ本体のバルブピン装着孔を避けて上記ゲート
部においてバルブピン装着孔に連通する樹脂通路が、上
記バルブ本体内に設けられる一方、上記バルブ本体には
樹脂を加熱するヒータとバルブ本体の温度を検知する温
度センサが内蔵されたことを特徴とする射出成形金型。1. A cavity is formed between a pair of mold plates,
A valve body is provided in one template, and a valve pin that opens and closes a gate through the valve body is provided on the valve body so as to be movable in the axial direction thereof,
A resin passage communicating with the valve pin mounting hole in the gate portion avoiding the valve pin mounting hole of the valve body is provided in the valve body, while the valve body has
Temperature for detecting the temperature of the heater that heats the resin and the valve body
An injection mold having a built-in degree sensor .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3062178A JP2730309B2 (en) | 1991-03-26 | 1991-03-26 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3062178A JP2730309B2 (en) | 1991-03-26 | 1991-03-26 | Injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0577285A JPH0577285A (en) | 1993-03-30 |
| JP2730309B2 true JP2730309B2 (en) | 1998-03-25 |
Family
ID=13192614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3062178A Expired - Fee Related JP2730309B2 (en) | 1991-03-26 | 1991-03-26 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2730309B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57137126A (en) * | 1981-02-18 | 1982-08-24 | Mitsubishi Metal Corp | Gate system of mold for injection molding |
| CA1252973A (en) * | 1986-12-01 | 1989-04-25 | Harald H. Schmidt | Side mounted manifold block for variable orientation of injection molding nozzle |
| CA1265907A (en) * | 1987-02-17 | 1990-02-20 | Jobst U. Gellert | Injection molding system having manifold with side mounted nozzles and method |
| CA1266358A (en) * | 1987-10-16 | 1990-03-06 | Jobst Ulrich Gellert | Injection molding system having clamped rotatable nozzles and method |
-
1991
- 1991-03-26 JP JP3062178A patent/JP2730309B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0577285A (en) | 1993-03-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19971118 |
|
| LAPS | Cancellation because of no payment of annual fees |