JP2002067069A - Injection molding method - Google Patents
Injection molding methodInfo
- Publication number
- JP2002067069A JP2002067069A JP2000252736A JP2000252736A JP2002067069A JP 2002067069 A JP2002067069 A JP 2002067069A JP 2000252736 A JP2000252736 A JP 2000252736A JP 2000252736 A JP2000252736 A JP 2000252736A JP 2002067069 A JP2002067069 A JP 2002067069A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- injection
- molds
- filling
- dies
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、単一の型締め装置
で型締めされる３個の金型を用いる射出成形方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method using three dies which are clamped by a single clamping device.
【０００２】[0002]
【従来の技術】従来、単一の型締め装置で型締めされる
３個の金型を用いる射出成形方法として、３個の金型の
うちキャビティ容積が最大の第１の金型に対して溶融樹
脂の射出充填を行う第１の射出機と、第１の金型以外の
第２と第３の２個の金型に対して溶融樹脂の射出充填を
行う第２の射出機とを用いて、各金型に対し同時に溶融
樹脂を射出充填して、射出成形に要する時間を短縮する
ものが知られている。2. Description of the Related Art Conventionally, as an injection molding method using three molds clamped by a single mold clamping device, a first mold having a maximum cavity volume among three molds is used. A first injection machine for performing injection and filling of the molten resin and a second injection machine for performing injection and filling of the molten resin for the second and third molds other than the first mold are used. It is known that a molten resin is injected and filled into each mold at the same time to reduce the time required for injection molding.
【０００３】[0003]
【発明が解決しようとする課題】上記の射出成形方法で
は、各金型に対する射出充填時の型締めに要する型締め
力の夫々を合計したものを型締め力として発生できる強
大な型締め装置が必要となり、成形製品の大きさや形状
によって成形が困難になる場合が生じるうえ、強大な型
締め力を発生できる型締め装置を新規に調達する場合、
コストアップの要因となる。In the above-described injection molding method, there is provided a powerful mold clamping apparatus capable of generating a sum of the respective mold clamping forces required for mold clamping during injection filling of each mold as a mold clamping force. It becomes necessary, molding may become difficult depending on the size and shape of the molded product, and when procuring a new clamping device that can generate a strong clamping force,
This will increase costs.
【０００４】本発明は、上記問題点に鑑み、型締め装置
の型締め力を抑制できて、単一の型締め装置で型締めさ
れる３個の金型を用いて能率的に射出成形を行うことが
できる方法を提供することを課題としている。SUMMARY OF THE INVENTION In view of the above problems, the present invention can suppress the clamping force of a mold clamping device and efficiently perform injection molding using three molds clamped by a single mold clamping device. The task is to provide a method that can be performed.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するた
め、単一の型締め装置で型締めされる３個の金型を用い
る射出成形方法において、本発明の第１の特徴によれ
ば、３個の金型のうちキャビティ容積が最大の第１の金
型に対して溶融樹脂の射出充填を行う第１の射出機と、
第１の金型以外の第２と第３の２個の金型に対して溶融
樹脂の射出充填を行う第２の射出機と、第２の射出機か
ら射出される溶融樹脂を第２と第３の両金型の一方と他
方とに選択的に充填可能な切替弁とを用い、第１の射出
機による第１の金型に対する射出充填と、第２の射出機
による第２と第３の両金型の一方の金型に対する射出充
填とを略同時に開始し、前記一方の金型に対する保圧工
程の完了直後に前記切替弁を切替えて第２の射出機によ
り第２と第３の両金型の他方の金型に対する射出充填を
開始し、又、本発明の第２の特徴によれば、３個の金型
のうちキャビティ容積が最大の第１の金型に対して溶融
樹脂の射出充填を行う第１の射出機と、第１の金型以外
の第２と第３の２個の金型に対して溶融樹脂の射出充填
を行う第２の射出機と、第２の射出機から射出される溶
融樹脂を第２と第３の両金型に夫々供給する供給路を夫
々開閉する開閉弁とを用い、第１の射出機による第１の
金型に対する射出充填と、第２の射出機による第２と第
３の両金型の一方の金型に対する射出充填とを略同時に
開始し、第１の金型に対する射出充填工程完了以後であ
って前記一方の金型に対する保圧工程完了以前に、該一
方の金型の前記開閉弁を開弁した状態で第２と第３の両
金型の他方の金型の前記開閉弁を開弁して前記第２の射
出機により前記他方の金型に対する射出充填を開始し、
該他方の金型に対する保圧工程の途中で前記一方の金型
の前記開閉弁を閉弁する。According to a first aspect of the present invention, there is provided an injection molding method using three dies which are clamped by a single clamping device. A first injection machine that performs injection filling of a molten resin into the first mold having the largest cavity volume among the three molds;
A second injection machine for injecting and filling the second and third molds other than the first mold with the molten resin, and a second and third molten resin injected from the second injection machine. A switching valve capable of selectively filling one and the other of the third molds is used to perform injection filling of the first mold by the first injection machine and second and second injection molds by the second injection machine. And injection filling of one of the two dies is started substantially simultaneously, and the switching valve is switched immediately after the pressure-holding step of the one of the dies is completed, and the second and third injection machines are operated by the second injection machine. Injection filling of the other mold into the other mold is started, and according to the second aspect of the present invention, the first mold having the largest cavity volume among the three molds is melted with respect to the first mold. A first injection machine for performing injection filling of a resin, and a second injection for performing injection filling of a molten resin for a second and third molds other than the first mold. A first mold using the first injection machine, and opening and closing valves for opening and closing supply paths for supplying molten resin injected from the second injection machine to the second and third molds, respectively. And the injection and filling of one of the second and third molds by the second injection machine are started substantially simultaneously, and after the injection and filling process for the first mold is completed, Before the pressure-holding step for one of the molds is completed, the on-off valve of the other one of the second and third molds is opened while the on-off valve of the one mold is opened. Injection filling for the other mold is started by the second injection machine,
The on-off valve of the one mold is closed during the pressure holding step for the other mold.
【０００６】型締め装置の型締め力は、第１の射出機か
ら射出される溶融樹脂が充填される第１の金型に要する
型締め力と、第２の射出機から射出される溶融樹脂が初
めに充填される、第２と第３の両金型の一方の金型に要
する型締め力との合計で足りて、発生すべき型締め力を
軽減できる。[0006] The mold clamping force of the mold clamping device is determined by the mold clamping force required for the first mold filled with the molten resin injected from the first injection machine, and the molten resin injected from the second injection machine. Is first filled, and the sum of the mold clamping force required for one of the second and third molds is sufficient, so that the mold clamping force to be generated can be reduced.
【０００７】さらに、本発明の第１の特徴によれば、第
２の射出機から射出される溶融樹脂が初めに充填され
る、第２と第３の両金型の一方の金型に対する保圧工程
完了後の冷却工程の開始と同時に第２と第３の両金型の
他方の金型に対する射出充填を開始するため、前記両金
型による射出成形サイクルタイムが短縮でき、又、本発
明の第２の特徴によれば、第２の射出機から射出される
溶融樹脂が初めに充填される、第２と第３の両金型の一
方の金型に対する保圧工程の途中で第２と第３の両金型
の他方の金型に対する射出充填を開始するため、前記両
金型による射出成形サイクルタイムがさらに短縮でき
る。Further, according to a first feature of the present invention, the first and second dies are first filled with the molten resin injected from the second injection machine, and the first and second dies are held in one of the dies. Since the injection filling of the other of the second and third dies is started simultaneously with the start of the cooling step after the completion of the pressure step, the injection molding cycle time by the two dies can be shortened. According to the second feature of the first aspect, the molten resin injected from the second injection machine is first filled, and the second and third dies are filled with the second resin during the pressure-holding step in one of the dies. Injection and filling of the other of the third mold and the third mold are started, so that the injection molding cycle time of the two molds can be further reduced.
【０００８】[0008]
【発明の実施の形態】図１及び図２は、単一の型締め装
置１で型締めされる３個の金型２、３、４を備える射出
成形装置の概要を示している。図１に示すように、型締
め装置１は、固定盤１ａと、加圧源１ｂにより駆動され
る可動盤１ｃとを備え、固定盤１ａには３個の金型２、
３、４の固定型２ａ、３ａ、４ａを取り付け、可動盤１
ｃには３個の金型２、３、４の可動型２ｃ、３ｃ、４ｃ
を取り付けるように構成されている。また、図２に示す
ように、３個の金型中最大のキャビティ容積の第１金型
２に第１射出機５が接続され、キャビティ容積の比較的
小さな第２と第３の両金型３、４に第２射出機６が接続
され、更に、第２と第３の金型３、４の各供給路には開
閉弁７、８が夫々設けられている。1 and 2 show an outline of an injection molding apparatus including three dies 2, 3, and 4 which are clamped by a single clamping apparatus 1. FIG. As shown in FIG. 1, the mold clamping device 1 includes a fixed plate 1a and a movable plate 1c driven by a pressure source 1b. The fixed plate 1a has three dies 2,
3 and 4 fixed dies 2a, 3a and 4a
c is a movable mold 2c, 3c, 4c of three molds 2, 3, 4
It is configured to be attached. As shown in FIG. 2, the first injection machine 5 is connected to the first mold 2 having the largest cavity volume among the three molds, and the second and third molds each having a relatively small cavity volume. The second injection machine 6 is connected to the third and third molds 3, and further, on-off valves 7 and 8 are provided in the supply paths of the second and third molds 3 and 4, respectively.
【０００９】射出充填に際して、型締め装置１により第
１乃至第３の全金型２、３、４を型締めし、また、第２
金型３の開閉弁７を開弁すると共に第３金型４の開閉弁
８を閉弁して第２射出機６から射出される溶融樹脂が初
めに第２金型３に充填されるように調整する。この状態
で、第１と第２の両射出機５、６から同時に溶融樹脂を
射出して第１と第２の金型２、３の夫々に対し射出充填
を行う。この際、型締め装置１の型締め力は第１と第２
の金型２、３の夫々に要する型締め力の合計で足り、３
個の金型に対し同時に溶融樹脂を射出充填する場合の型
締め力（３個の金型の夫々に要する型締め力の合計）に
比し軽減できる。射出充填工程が完了すると、保圧工程
と冷却工程の順でこれらの工程から成る射出成形サイク
ルを夫々行う。尚、保圧工程では、第１と第２の両射出
機５、６の射出圧力を比較的低圧にし、金型内の溶融樹
脂を加圧下で凝固させ始め、一方、冷却工程では、非加
圧下で金型内の樹脂を完全に凝固させる。At the time of injection filling, the first to third molds 2, 3, and 4 are clamped by the mold clamping device 1, and
The on-off valve 7 of the mold 3 is opened and the on-off valve 8 of the third mold 4 is closed so that the molten resin injected from the second injection machine 6 is first filled in the second mold 3. Adjust to In this state, the molten resin is simultaneously injected from the first and second injection machines 5 and 6 to perform injection filling on the first and second dies 2 and 3 respectively. At this time, the mold clamping force of the mold clamping device 1 is the first and the second.
The sum of the mold clamping force required for each of the molds 2 and 3 is sufficient.
This can be reduced as compared to the mold clamping force (sum of the mold clamping forces required for each of the three molds) when the molten resin is injected and filled into the individual molds at the same time. When the injection filling step is completed, an injection molding cycle including these steps is performed in the order of the pressure holding step and the cooling step. In the pressure-holding step, the injection pressure of the first and second injection machines 5, 6 is set to a relatively low pressure, and the molten resin in the mold starts to solidify under pressure. The resin in the mold is completely solidified under pressure.
【００１０】ところで、第２金型３の次には第３金型４
に対して第２射出機６から溶融樹脂の射出充填を行い、
射出成形サイクルを開始する。このようにして、第１乃
至第３の金型２、３、４の夫々において、各工程段階で
各金型に固有の工程時間に基づいた射出成形サイクルを
行う。ここで、第２金型３に対する射出成形サイクル中
の冷却工程が完了したタイミングで第２射出機６により
第３金型４に対する射出充填を行って射出成形サイクル
を開始すると、第２と第３の両金型３、４に対する射出
成形サイクルの完了時間は、図３（ａ）にｔ1として示
される第１金型２に対する射出成形サイクルの完了時間
を大幅に越える場合があり、第１乃至第３の全金型２、
３、４が単一の型締め装置１で固定されていて第１乃至
第３の金型２、３、４のいずれか１個に対してさえ、冷
却工程の次に行う型開き工程に移行できないことと相俟
って能率的でない。そこで、このような場合には、図３
（ｂ）に示すように、第２金型３に対する射出成形サイ
クル中の保圧工程の完了時点Ｔ1で、第２金型３の開閉
弁７を閉弁すると共に第３金型４の開閉弁８を開弁し、
第２射出機６から第３金型４に対して溶融樹脂の射出充
填を行って第３金型４に対する射出成形サイクルを開始
する。このようにして、第３金型４に対する射出充填工
程後の射出成形サイクルと、第２金型３に対する冷却工
程以降の射出成形サイクルとを並行して進行させて第２
射出機６側の第２と第３の両金型３、４に対する射出成
形サイクルが完了する時間をｔ2に早める。尚、本実施
の形態では、第２射出機６から射出される溶融樹脂を第
２と第３の金型３、４の夫々に選択的に充填するように
第２と第３の金型３、４の両開閉弁７、８を作動させ、
かくて、両開閉弁７、８により、第２と第３の金型３、
４の夫々に選択的に溶融樹脂を充填する切替弁を構成し
ているが、第２と第３の金型３、４の夫々に対して選択
的に充填可能な三方弁のような単一の切替弁を用いるこ
ともできる。The second mold 3 is followed by a third mold 4
Is injected and filled with molten resin from the second injection machine 6 for
Start the injection molding cycle. In this way, in each of the first to third dies 2, 3, and 4, an injection molding cycle is performed at each process step based on a process time unique to each dies. Here, when the second injection machine 6 performs the injection filling to the third mold 4 at the timing when the cooling process in the injection molding cycle for the second mold 3 is completed, the second and third injection molding cycles are started. In some cases, the completion time of the injection molding cycle for both dies 3 and 4 may greatly exceed the completion time of the injection molding cycle for the first die 2 shown as t 1 in FIG. Third full mold 2,
3 and 4 are fixed by the single mold clamping device 1, and even for any one of the first to third dies 2, 3, and 4, the process proceeds to the mold opening process performed after the cooling process. It is not efficient because it cannot be done. Therefore, in such a case, FIG.
As shown in (b), at the completion time T 1 of the pressure holding step in the injection molding cycle for the second mold 3, the on-off valve 7 of the second mold 3 is closed and the third mold 4 is opened and closed. Open valve 8,
The second injection machine 6 performs injection filling of the third mold 4 with molten resin, and starts an injection molding cycle for the third mold 4. In this way, the injection molding cycle after the injection filling step for the third mold 4 and the injection molding cycle after the cooling step for the second mold 3 are advanced in parallel to perform the second molding.
The time to complete the injection molding cycle for the second and third dies 3 and 4 on the side of the injection machine 6 is advanced to t 2 . In this embodiment, the second and third dies 3 and 4 are selectively filled with the molten resin injected from the second injection machine 6 into the second and third dies 3 and 4 respectively. Activate both on-off valves 7, 8 of 4,
Thus, by the two on-off valves 7, 8, the second and third molds 3,
4 is a switching valve for selectively filling each of the molds 3 and 4 with a molten resin. May be used.
【００１１】図３（ｃ）は、第２と第３の両金型３、４
に対する射出成形サイクルを更に早期に完了できる他の
実施形態を示す。このものでは、第２金型３に対する射
出成形サイクル中の保圧工程の途中の時点Ｔ2で第２金
型３の開閉弁７を開弁した状態で第３金型４の開閉弁８
を開弁した後に、第２射出機６から第３金型４に対して
溶融樹脂の射出充填を行って第３金型４に対する射出成
形サイクルを開始し、この後、第２金型３に対する保圧
工程の完了時点Ｔ3で第２金型３の開閉弁７を閉弁すれ
ば、第３金型４に対する射出充填工程後の射出成形サイ
クルと、第２金型３に対する保圧工程途中以降の射出成
形サイクルとを並行して進行させることができて、第２
射出機６側の第２と第３の両金型３、４に対する射出成
形サイクルが完了する時間をｔ3に更に早めることがで
きる。この場合、保圧工程中の第２金型３は、第３金型
４に対する射出充填工程以降の射出圧力の影響を受ける
が、第２金型３の開閉弁７の閉弁以降はその影響を受け
ずに第２金型３に固有の冷却工程を確保できるので、第
２金型３で成形される製品の品質に対して上記の第３金
型４に対する射出圧力が及ぼす影響は限定的である。FIG. 3C shows the second and third molds 3 and 4.
5 shows another embodiment in which the injection molding cycle can be completed earlier. In this construction, in a state where the opening and closing valve 7 of the second mold 3 during the time T 2 of the pressure holding process during the injection molding cycle was opened to the second mold 3 third mold 4 on-off valve 8
After the valve is opened, the second injection machine 6 performs injection filling of the third mold 4 with a molten resin to start an injection molding cycle for the third mold 4. If the on-off valve 7 of the second mold 3 is closed at the time T 3 of completion of the pressure holding step, the injection molding cycle after the injection filling step for the third mold 4 and the pressure holding step for the second mold 3 The subsequent injection molding cycle can proceed in parallel,
The time to complete the injection molding cycle for the second and third molds 3 and 4 on the side of the injection machine 6 can be further advanced to t 3 . In this case, the second mold 3 during the pressure-holding step is affected by the injection pressure of the third mold 4 after the injection filling step, and the influence after the closing of the on-off valve 7 of the second mold 3 Since the cooling process peculiar to the second mold 3 can be secured without receiving the heat, the influence of the injection pressure on the third mold 4 on the quality of the product formed by the second mold 3 is limited. It is.
【００１２】[0012]
【発明の効果】以上の説明から明らかなように、本発明
によれば、３個の金型に対し同時に溶融樹脂の射出充填
を行う場合に比べ、型締め装置の型締め力が軽減でき、
また、第２射出機６により溶融樹脂の射出充填を行う第
２と第３の両金型３、４に対する射出成形サイクルタイ
ムを短縮できる。そして、第１金型２に対する射出成形
サイクルタイムに合せて第２と第３の両金型３、４に対
する射出成形サイクルタイムを更に短縮することができ
る。As is apparent from the above description, according to the present invention, the mold clamping force of the mold clamping device can be reduced as compared with the case where the molten resin is injected and filled into three molds simultaneously.
In addition, the injection molding cycle time for the second and third dies 3 and 4 in which the molten resin is injected and filled by the second injection machine 6 can be shortened. Then, the injection molding cycle time for the second and third dies 3 and 4 can be further reduced in accordance with the injection molding cycle time for the first mold 2.
【図１】本発明方法の実施に用いる射出成形装置の概略
平面図FIG. 1 is a schematic plan view of an injection molding apparatus used for carrying out the method of the present invention.
【図２】図１の射出成形装置の要部の断面図FIG. 2 is a sectional view of a main part of the injection molding apparatus of FIG.
【図３】（ａ）第１金型に対する射出成形サイクルを示
す図 （ｂ）第２、第３金型に対する射出成形サイクルを示す
図 （ｃ）第２、第３金型に対する別の射出成形サイクルを
示す図3A is a diagram showing an injection molding cycle for a first mold; FIG. 3B is a diagram showing an injection molding cycle for a second and third mold; FIG. 3C is another injection molding for the second and third molds; Diagram showing cycle
１ 型締め装置 ２ 第１金型 ３ 第２金型 ４ 第３金型 ５ 第１射出機 ６ 第２射出機 ７、８ 開閉弁 DESCRIPTION OF SYMBOLS 1 Mold clamping device 2 1st die 3 2nd die 4 3rd die 5 1st injection machine 6 2nd injection machine 7, 8 On-off valve
Claims (2)
型を用いる射出成形方法において、前記３個の金型のう
ちキャビティ容積が最大の第１の金型に対して溶融樹脂
の射出充填を行う第１の射出機と、第１の金型以外の第
２と第３の２個の金型に対して溶融樹脂の射出充填を行
う第２の射出機と、該第２の射出機から射出される溶融
樹脂を第２と第３の両金型の一方と他方とに選択的に充
填可能な切替弁とを用い、前記第１の射出機による第１
の金型に対する射出充填と、前記第２の射出機による第
２と第３の両金型の一方の金型に対する射出充填とを略
同時に開始し、前記一方の金型に対する保圧工程の完了
直後に前記切替弁を切替えて前記第２の射出機により第
２と第３の両金型の他方の金型に対する射出充填を開始
することを特徴とする射出成形方法。1. An injection molding method using three dies which are clamped by a single clamping device, wherein the first mold having the largest cavity volume among the three dies is melted. A first injection machine for performing injection and filling of a resin, a second injection machine for performing injection and filling of a molten resin to two second and third dies other than the first die, and A switching valve capable of selectively filling one and the other of the second and third molds with the molten resin injected from the second injection machine;
And the injection and filling of one of the second and third dies by the second injection machine are started substantially simultaneously, and the pressure-holding step for the one of the dies is completed. Immediately after that, the switching valve is switched and the second injection machine starts injection filling of the other of the second and third molds into the other mold.
型を用いる射出成形方法において、前記３個の金型のう
ちキャビティ容積が最大の第１の金型に対して溶融樹脂
の射出充填を行う第１の射出機と、第１の金型以外の第
２と第３の２個の金型に対して溶融樹脂の射出充填を行
う第２の射出機と、該第２の射出機から射出される溶融
樹脂を第２と第３の両金型に夫々供給する供給路を夫々
開閉する開閉弁とを用い、前記第１の射出機による第１
の金型に対する射出充填と、前記第２の射出機による第
２と第３の両金型の一方の金型に対する射出充填とを略
同時に開始し、第１の金型に対する射出充填工程完了以
後であって前記一方の金型に対する保圧工程完了以前
に、該一方の金型の前記開閉弁を開弁した状態で第２と
第３の両金型の他方の金型の前記開閉弁を開弁して前記
第２の射出機により前記他方の金型に対する射出充填を
開始し、該他方の金型に対する保圧工程の途中で前記一
方の金型の前記開閉弁を閉弁することを特徴とする射出
成形方法。2. An injection molding method using three molds clamped by a single mold clamping device, wherein the first mold having the largest cavity volume among the three molds melts. A first injection machine for performing injection and filling of a resin, a second injection machine for performing injection and filling of a molten resin to two second and third dies other than the first die, and And an on-off valve for opening and closing supply paths for supplying the molten resin injected from the second injection machine to the second and third molds, respectively.
And the injection and filling of one of the second and third dies by the second injection machine are started substantially simultaneously, and after the injection and filling step of the first mold is completed. And before the pressure-holding step for the one mold is completed, the open / close valve of the other mold of the second and third molds is opened while the open / close valve of the one mold is opened. Opening the valve to start injection filling of the other mold by the second injection machine, and closing the open / close valve of the one mold during the pressure-holding step for the other mold. Characteristic injection molding method.
Priority Applications (1)
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|---|---|---|---|
| JP2000252736A JP4266274B2 (en) | 2000-08-23 | 2000-08-23 | Injection molding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000252736A JP4266274B2 (en) | 2000-08-23 | 2000-08-23 | Injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002067069A true JP2002067069A (en) | 2002-03-05 |
| JP4266274B2 JP4266274B2 (en) | 2009-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000252736A Expired - Fee Related JP4266274B2 (en) | 2000-08-23 | 2000-08-23 | Injection molding method |
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| Country | Link |
|---|---|
| JP (1) | JP4266274B2 (en) |
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2000
- 2000-08-23 JP JP2000252736A patent/JP4266274B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP4266274B2 (en) | 2009-05-20 |
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