JP4850930B2 - Method of manufacturing a molded product using an injection molding machine - Google Patents

Method of manufacturing a molded product using an injection molding machine Download PDF

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JP4850930B2
JP4850930B2 JP2009140789A JP2009140789A JP4850930B2 JP 4850930 B2 JP4850930 B2 JP 4850930B2 JP 2009140789 A JP2009140789 A JP 2009140789A JP 2009140789 A JP2009140789 A JP 2009140789A JP 4850930 B2 JP4850930 B2 JP 4850930B2
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浩介 西野
健四郎 阿部
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キヤノン株式会社
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本発明は、射出成形機を用いた成形品の製造方法に関する。 The present invention relates to a method for manufacturing a molded product using an injection molding machine .
射出成形機と後工程を直結した生産システムでは、成形数を後工程の処理数に合わせる必要がある。従って従来は後工程の異常時には過剰供給を防ぐために、成形品を破棄しており非常に不経済であった。このような状況下でオペレータ、もしくは後工程からの異常信号により、射出成形機を自動停止させることは可能であるが、射出成形機を一旦停止させると金型温度が低下し、シリンダ内の樹脂の温度等が変化する。そのため、射出成形機の再起動時には金型温度、樹脂温度が安定するまでに長時間を要し、作業能率の低下を招く。   In a production system in which an injection molding machine and a post-process are directly connected, it is necessary to match the number of moldings with the number of post-processes. Therefore, conventionally, in order to prevent excessive supply in the event of abnormalities in the post-process, the molded product is discarded, which is very uneconomical. Under such circumstances, the injection molding machine can be automatically stopped by an operator or an abnormal signal from a subsequent process. However, once the injection molding machine is stopped, the mold temperature decreases, and the resin in the cylinder Temperature changes. For this reason, when the injection molding machine is restarted, it takes a long time for the mold temperature and the resin temperature to stabilize, resulting in a reduction in work efficiency.
このようなことから、特許文献1のように射出成形機とそれと直結した後工程と、それらとは別の成形品を蓄積するストッカを設け、後工程の異常時に発信された信号を射出成形機で受信し、成形品をストッカに搬送すると同時に、成形サイクルを延長させる方法が提案されている。この方法によると、ストッカを設けることで、後工程の異常時に成形機を止めることなく成形でき、また成形サイクルを延長することによって、ストッカの増加を抑えることができる。
また、別の方法として、特許文献2のように射出成形機と後工程を直結せずに、それらの間に成形品を蓄積するストッカを設け、成形数、後工程の処理数、ストッカの蓄積数をセンサで検出し、成形サイクルを伸縮させることによって生産システムを制御する方法が提案されている。
For this reason, an injection molding machine, a post-process directly connected to the injection molding machine as in Patent Document 1, and a stocker for storing molded products different from those are provided, and a signal transmitted when the post-process is abnormal is injected into the injection molding machine. And a method of extending a molding cycle at the same time as conveying a molded product to a stocker. According to this method, by providing the stocker, it is possible to perform molding without stopping the molding machine when the post-process is abnormal, and it is possible to suppress an increase in the stocker by extending the molding cycle.
In addition, as another method, as in Patent Document 2, a stocker for accumulating molded products is provided between the injection molding machine and the post-process, and the number of moldings, the number of post-processes, and the accumulation of stockers are provided between them. A method has been proposed in which the production system is controlled by detecting the number with a sensor and extending or contracting the molding cycle.
これらのいずれの発明も、成形サイクルの伸縮は、冷却時間または型閉動作前の中間時間をタイマ制御することにより行われるものであるが、ここで図2を用いて、これらの従来例での通常の成形サイクル時における動作の1サイクルと、成形サイクル伸縮時における動作の1サイクルの関係について、説明しておく。図2は、成形サイクルにおける射出成形工程の動作を示す図である。図2の動作Cは通常成形時の動作を示している。
図2において、11は型閉工程、12は低圧型締工程、13は高圧型締工程、14は射出工程、15は保圧工程、16冷却工程である。また、17は計量工程、18は型開工程、19はエジェクタ工程、20は待機工程、21は中間時間延長工程である。
In any of these inventions, the expansion and contraction of the molding cycle is performed by timer control of the cooling time or the intermediate time before the mold closing operation. Here, with reference to FIG. The relationship between one cycle of operation during a normal molding cycle and one cycle of operation during expansion / contraction of the molding cycle will be described. FIG. 2 is a diagram showing the operation of the injection molding process in the molding cycle. The operation C in FIG. 2 shows the operation during normal molding.
In FIG. 2, 11 is a mold closing process, 12 is a low pressure mold clamping process, 13 is a high pressure mold clamping process, 14 is an injection process, 15 is a pressure holding process, and 16 cooling process. Reference numeral 17 denotes a weighing process, 18 denotes a mold opening process, 19 denotes an ejector process, 20 denotes a standby process, and 21 denotes an intermediate time extension process.
動作Cにおいて、まず型閉11から始まり低圧型締12、高圧型締13ののちにシリンダ内の樹脂が金型内に射出14される。次いで保圧工程15の後に冷却工程16に入ると同時に、次の射出のための樹脂をシリンダ先端に送る計量動作17を行う。冷却工程16の後、型開18しエジェクタ19して成形品を取出す。成形品の取出し中における成形機の待機20から次の成形サイクルの型閉11までが、通常成形時の動作Cの1サイクルである。   In operation C, the resin in the cylinder is first injected into the mold 14 after the low pressure mold clamping 12 and the high pressure mold clamping 13 are started from the mold closing 11. Next, at the same time as entering the cooling step 16 after the pressure holding step 15, a metering operation 17 is performed in which the resin for the next injection is sent to the cylinder tip. After the cooling step 16, the mold is opened 18 and the ejector 19 is taken out to take out the molded product. The period from the standby 20 of the molding machine during the removal of the molded product to the mold closing 11 of the next molding cycle is one cycle of the operation C during normal molding.
以上に対して、動作Dはストッカ数をカウントしたセンサから射出成形機が信号を受信した際の、成形サイクル伸縮時の動作を示す。
なお、この図2では、成形サイクルの伸縮を、成形品の取出し中における成形機の待機20から次の成形サイクルの型閉11までの中間時間を延長して調整する場合の例である。上記従来例ではこのような中間時間の調整(延長)以外に、冷却時間の調整(延長)して成形サイクルの伸縮を行うことが開示されている。
成形サイクル伸縮時にも型閉11からエジェクタ19後の待機20までは通常成形時の動作Cと同様であるが、その後の中間時間21をタイマにより制御する。タイマはストッカ数が多ければ長く、少なければ短くセットされる。タイマにセットされた中間時間21の経過後から型閉を行うまでが、成形サイクル伸縮時の動作Dの1サイクルである。なお、従来例では上記のような中間時間の調整(延長)以外に、冷却時間の調整(延長)により成形サイクルの伸縮を行うことについても開示されている。
On the other hand, the operation D shows the operation at the time of expansion / contraction of the molding cycle when the injection molding machine receives a signal from the sensor counting the number of stockers.
FIG. 2 shows an example in which the expansion / contraction of the molding cycle is adjusted by extending the intermediate time from the standby 20 of the molding machine during the removal of the molded product to the mold closing 11 of the next molding cycle. In the above conventional example, in addition to adjusting (extending) such an intermediate time, it is disclosed that the molding cycle is expanded / contracted by adjusting (extending) the cooling time.
Even during the molding cycle expansion and contraction, from the mold closing 11 to the standby 20 after the ejector 19 is the same as the operation C at the time of normal molding, the subsequent intermediate time 21 is controlled by a timer. The timer is set longer when the number of stockers is larger, and shorter when the number is smaller. The period from the elapse of the intermediate time 21 set in the timer to the closing of the mold is one cycle of the operation D at the time of expansion / contraction of the molding cycle. The conventional example also discloses that the molding cycle is expanded and contracted by adjusting (extending) the cooling time in addition to adjusting (extending) the intermediate time as described above.
特開2001−129863号公報JP 2001-129863 A 特公平7−121547号公報Japanese Examined Patent Publication No. 7-121547
しかしながら、上記特許文献1の方法では、ストッカに搬送された成形品の後処理のために別途工程を設けなければならないことから、生産効率の点で問題を有している。これに対して、上記特許文献2の方法では、ストッカに搬送された成形品の後処理のために別途工程を設ける点の問題点は解消し得るとしても、これらの従来例では、成形サイクルを伸縮させる方法として、上記したように冷却時間、あるいは中間時間を調整するようにしている点で、つぎのような問題を有している。   However, the method of Patent Document 1 has a problem in terms of production efficiency because a separate process must be provided for post-processing of the molded product conveyed to the stocker. On the other hand, in the method of Patent Document 2, although the problem of providing a separate process for post-processing of the molded product conveyed to the stocker can be solved, in these conventional examples, the molding cycle is reduced. As a method of expanding and contracting, there is the following problem in that the cooling time or the intermediate time is adjusted as described above.
すなわち、通常の成形では、金型温度は樹脂の射出時に高くなり、冷却、型開閉工程を経て徐々に低下する。また樹脂は計量時のスクリュ回転によってせん断発熱し、シリンダ温度よりも樹脂温度が高くなる。計量完了から次の成形サイクルの射出開始までの間、シリンダから外気への放熱によって、樹脂温度は時間とともに低下する。
したがって、成形サイクルが一定であれば、射出時の金型温度、樹脂温度はほぼ一定であると見なせる。しかし成形サイクルが一定でない場合は射出から次の射出までの時間、計量完了から射出開始までの時間が異なることにより、射出時の金型温度、樹脂温度に差が生じてしまうこととなる。
That is, in normal molding, the mold temperature becomes high when the resin is injected, and gradually decreases after cooling and mold opening / closing steps. In addition, the resin generates shear heat due to the rotation of the screw during measurement, and the resin temperature becomes higher than the cylinder temperature. From the completion of measurement to the start of injection of the next molding cycle, the resin temperature decreases with time due to heat radiation from the cylinder to the outside air.
Therefore, if the molding cycle is constant, it can be considered that the mold temperature and the resin temperature at the time of injection are substantially constant. However, when the molding cycle is not constant, the time from injection to the next injection and the time from completion of measurement to the start of injection differ, resulting in a difference in mold temperature and resin temperature at the time of injection.
特に、上記従来例のように、成形サイクルの伸縮を冷却時間、あるいは中間時間の調整によって行うものにおいては、成形品の品質に及ぼす影響がきわめて大きくなる。
すなわち、冷却時間の調整による場合には、成形品の取出温度を変化させ、後収縮による寸法差を生じさせ、また中間時間の調整による場合には上記したように計量完了から次の成形サイクルの射出開始までの時間が異なることにより、射出時の金型温度、樹脂温度に著しく差を生じさせてしまうこととなる。
これらは樹脂の充填性を変化させ、金型内の樹脂圧力に影響を及ぼし、成形品の寸法差を生じさせる原因となる。したがって、上記冷却時間、中間時間の調整による成形サイクルの伸縮は、良品条件範囲がきわめて限定されたものとなる。
In particular, in the case where the expansion and contraction of the molding cycle is performed by adjusting the cooling time or the intermediate time as in the conventional example, the influence on the quality of the molded product becomes extremely large.
That is, when adjusting the cooling time, the temperature at which the molded product is taken out is changed, resulting in a dimensional difference due to post-shrinkage, and when adjusting the intermediate time, as described above, from the completion of the measurement, the next molding cycle is completed. Due to the difference in the time until the start of injection, there will be a significant difference between the mold temperature and the resin temperature at the time of injection.
These change the filling property of the resin, affect the resin pressure in the mold, and cause a dimensional difference in the molded product. Therefore, the expansion / contraction of the molding cycle by adjusting the cooling time and the intermediate time has a very limited range of good products.
本発明は、上記課題に鑑み、成形サイクルを伸縮して射出成形するに際し、樹脂射出工程における射出時の樹脂温度と金型温度との温度差を可及的に生じさせないで射出成形することができ、成形品の品質低下を抑制することが可能となる射出成形機を用いた成形品の製造方法を提供することを目的とするものである。 In view of the above problems, the present invention can perform injection molding without causing as much temperature difference as possible between the resin temperature and the mold temperature at the time of injection in the resin injection process when performing injection molding by expanding and contracting the molding cycle. An object of the present invention is to provide a method for manufacturing a molded product using an injection molding machine that can suppress deterioration in quality of the molded product .
本発明は、以下のように構成した射出成形機を用いた成形品の製造方法を提供するものである。
すなわち、本発明の射出成形機を用いた成形品の製造方法は、低圧型締工程、高圧型締工程、計量工程にて計量された樹脂を射出する射出工程および前記射出した樹脂を冷却する冷却工程を含む成形サイクルで成形された成形品を、ストッカに蓄積した後、後工程に供給する射出成形機を用いた成形品の製造方法であって、
前記成形サイクルは、前記成形サイクルの時間を伸縮させる工程を有し、
前記成形サイクルの時間を伸縮させる工程は、
前記ストッカにおける前記成形品の蓄積量に応じて遅延時間を決定する工程と、
前記樹脂の計量工程の開始時間と、前記低圧型締工程後の高圧型締工程開始時間または高圧型締工程後の射出工程開始時間とを、前記遅延時間遅らせる工程と、
を含んでいることを特徴としている。
また、本発明の射出成形機を用いた成形品の製造方法は、前記計量工程の開始時間は、前記冷却工程開始時に、タイマに前記遅延時間をセットすることで遅らせることを特徴としている。
The present invention provides a method for producing a molded product using an injection molding machine configured as follows.
That is, the method for manufacturing a molded article using the injection molding machine of the present invention includes a low pressure clamping process, a high pressure clamping process, an injection process for injecting a resin weighed in a weighing process, and a cooling for cooling the injected resin. molded article which is molded in the molding cycle comprising the steps, after storing the stocker, and supplies the higher rear Engineering, a method for producing a molded article using an injection molding machine,
The molding cycle has a step of expanding and contracting the time of the molding cycle,
The step of expanding and contracting the time of the molding cycle includes:
Determining a delay time according to the amount of the molded product accumulated in the stocker;
Delaying the start time of the metering step of the resin and the high pressure mold clamping process start time after the low pressure mold clamping process or the injection process start time after the high pressure mold clamping process; and
It is characterized by containing .
Moreover, the manufacturing method of the molded article using the injection molding machine of the present invention is characterized in that the start time of the weighing process is delayed by setting the delay time in a timer at the start of the cooling process .
本発明によれば、成形サイクルを伸縮して射出成形するに際し、樹脂射出工程における射出時の樹脂温度と金型温度との温度差を可及的に生じさせないで射出成形することができ、成形品の品質低下を抑制することが可能となる射出成形機を用いた成形品の製造方法を実現することができる。 According to the present invention, when performing injection molding by expanding and contracting a molding cycle, injection molding can be performed without causing as much as possible the temperature difference between the resin temperature and the mold temperature during injection in the resin injection process. It is possible to realize a method of manufacturing a molded product using an injection molding machine that can suppress deterioration in product quality.
本発明の実施例1における成形サイクル伸縮時の射出成形工程の動作図。The operation | movement figure of the injection molding process at the time of expansion-contraction of the molding cycle in Example 1 of this invention. 従来例における成形サイクル伸縮時の射出成形工程の動作図。The operation | movement figure of the injection molding process at the time of expansion-contraction of the molding cycle in a prior art example. 本発明の実施例2における生産システムの構成を示す図。The figure which shows the structure of the production system in Example 2 of this invention. 本発明の実施例2におけるストッカの蓄積数、信号と射出成形機の動作の説明図。Explanatory drawing of the accumulation | storage number of a stocker, the signal, and operation | movement of an injection molding machine in Example 2 of this invention. 本発明の実施例2を説明する射出成形機の動作のフローチャート。The flowchart of operation | movement of the injection molding machine explaining Example 2 of this invention.
本発明を実施するための形態を、以下の実施例により説明する。 Shaped state for carrying out the present invention will be illustrated by the following examples.
[実施例1]
実施例1は、上記した本発明の構成を、射出成形方法に適用したものであり、これらを図を用いて説明する。
図1は、本実施例における成形サイクル伸縮時の射出成形工程の動作を示す図である。
図1の動作Aでは、高圧型締を開始する時間、あるいは計量を開始する時間を調整する場合の構成例について説明する。
また、図1の動作Bでは、射出を開始する時間を調整する場合の構成例について説明する。なお、図1に示す射出成形工程において、従来例と同一の構成については同一符号が付されていることから、重複する構成についてはその説明を省略する。
図1において、22は高圧型締遅延工程、23は計量遅延工程、24は射出遅延工程である。
本実施例では、図1の動作Aにおいて、低圧型締工程12完了後、高圧型締13に入るまでの高圧型締遅延工程22において、高圧型締遅延時間をタイマ制御するように構成されている。ここで、タイマはストッカ数が多ければ長く、少なければ短くセットされる。タイマにセットされた高圧型締遅延時間の経過後に、高圧型締13を開始する。
また、本実施例では、高圧型締工程13の後、射出工程14を経て、保圧工程15で保圧を行う。保圧工程15の後、冷却工程16に入ると同時に、計量開始までの計量遅延工程23において、計量遅延時間をタイマ制御するように構成されている。
[Example 1]
In Example 1, the above-described configuration of the present invention is applied to an injection molding method, which will be described with reference to the drawings.
FIG. 1 is a diagram showing an operation of an injection molding process when a molding cycle is expanded and contracted in the present embodiment.
In the operation A of FIG. 1, a configuration example in the case of adjusting the time for starting high-pressure mold clamping or the time for starting weighing will be described.
In addition, in operation B of FIG. 1, a configuration example in the case of adjusting the time for starting injection will be described. In the injection molding step shown in FIG. 1, the same reference numerals are given to the same components as those in the conventional example, and the description of the duplicate components is omitted.
In FIG. 1, 22 is a high-pressure mold clamping delay process, 23 is a metering delay process, and 24 is an injection delay process.
In the present embodiment, in the operation A of FIG. 1, the high pressure mold clamping delay time 22 from the completion of the low pressure mold clamping process 12 to the start of the high pressure mold clamping 13 is configured to timer-control the high pressure mold clamping delay time. Yes. Here, the timer is set longer when the number of stockers is larger, and shorter when the number is smaller. After the high pressure mold clamping delay time set in the timer has elapsed, the high pressure mold clamping 13 is started.
Further, in this embodiment, after the high pressure mold clamping process 13, the pressure holding process is performed in the pressure holding process 15 through the injection process 14. At the same time as entering the cooling step 16 after the pressure holding step 15, the metering delay time 23 until the start of metering is configured to perform timer control of the metering delay time.
本実施例では、冷却16後に型開18し、エジェクタ19後の待機20から次の成形サイクルの型閉11までが、成形サイクル伸縮時の1サイクルである。
本実施例では、成形サイクルを伸縮させるための時間調整が、金型温度の変化の少ない型閉工程後の高圧型締め開始前でなされているため、上記従来例のように金型温度が低下する型開工程後の中間時間延長工程で行われているものに比して、金型温度の低下を著しく抑制することが可能となる。
また、本実施例では、高圧型締遅延工程22においてタイマ制御によって遅延させた時間分と同じ時間分、計量遅延工程においてタイマ制御によって計量開始時間を遅延させることができるため、計量完了から次の成形サイクルの射出開始までの間に、シリンダから外気への放熱によって、樹脂温度を時間とともに低下させるものに比して、樹脂温度の低下を著しく抑制することが可能となる。
In this embodiment, the mold opening 18 is performed after the cooling 16 and the standby 20 after the ejector 19 to the mold closing 11 of the next molding cycle is one cycle at the time of expansion / contraction of the molding cycle.
In this embodiment, the time for expanding and contracting the molding cycle is adjusted before the start of high-pressure clamping after the mold closing process with little change in the mold temperature. Compared to what is performed in the intermediate time extension step after the mold opening step, it is possible to remarkably suppress a decrease in mold temperature.
Further, in this embodiment, the measurement start time can be delayed by the timer control in the measurement delay process by the same time as the time delayed by the timer control in the high pressure mold clamping delay process 22, so By the heat radiation from the cylinder to the outside air before the start of the injection of the molding cycle, it is possible to remarkably suppress the decrease in the resin temperature as compared with the case where the resin temperature is decreased with time.
本実施例においては、図1の動作Bに示されているように、成形サイクルを伸縮させるための時間調整を、射出遅延工程あるいは上記動作Aと同様に計量遅延工程で行うようにしても、上記動作Aの場合と同様に、金型温度あるいは樹脂温度の低下を著しく抑制することが可能となる。   In this embodiment, as shown in the operation B of FIG. 1, the time adjustment for expanding and contracting the molding cycle may be performed in the injection delay step or the measurement delay step in the same manner as the operation A. As in the case of the operation A, it is possible to remarkably suppress a decrease in mold temperature or resin temperature.
以上のことから、本実施例によると、成形サイクルを伸縮して射出成形するに際し、樹脂射出工程における射出時の樹脂温度と金型温度との温度差を可及的に生じさせないで射出成形することが可能となる。
なお、上記した本実施例の説明では、成形サイクルを伸縮させるための時間調整を行う工程を個別に説明したが、本実施例における成形サイクルの伸縮は、高圧型締工程の高圧型締開始時間及び/又は射出工程の射出開始時間の調整によっても行うことができ、また、前記高圧型締工程の高圧型締開始時間及び/又は射出工程の射出開始時間における調整時間に相当する時間分、前記計量工程の計量開始時間を調整することによっても実施することが可能である。
From the above, according to the present embodiment, when performing injection molding by expanding and contracting the molding cycle, injection molding is performed without causing as much as possible the temperature difference between the resin temperature and the mold temperature at the time of injection in the resin injection process. It becomes possible.
In the above description of the present embodiment, the process for adjusting the time for expanding and contracting the molding cycle is individually described. However, the expansion and contraction of the molding cycle in the present embodiment is the high-pressure mold clamping start time of the high-pressure mold clamping process. And / or adjustment of the injection start time of the injection process, and a time corresponding to the adjustment time of the high pressure mold clamping start time of the high pressure mold clamping process and / or the injection start time of the injection process, It can also be carried out by adjusting the measurement start time of the measurement process.
[実施例2]
実施例2は、上記した実施例1の射出成形方法を、生産システムに適用したものであり、これらを図を用いて説明する。
図3は、本実施例における生産システムの構成を示したものである。
図3において、30は射出成形機、31は後工程、32は搬送手段、33はストッカ、34はセンサである。
射出成形機30は、公知の工程によってペレット樹脂からプラスチック成形品を得る装置であり、1台でも複数台あってもよい。
また、後工程31は、例えば射出成形機30で成形された成形品と他の部品、または複数の射出成形機30によって成形された成形品同士の組立処理を行う。
搬送手段32は射出成形機30で成形された成形品を金型から取り出し後、後工程31に搬送すると同時に、射出成形機30から後工程31までの間に成形品を冷却する役割も持ち、射出成形機30から後工程31まで所定の冷却時間になるよう一定の速度で動作する。
ストッカ33は、射出成形機30で成形され搬送手段32で搬送された成形品を一時的に蓄積し、例えば図に示したような下から積み上げられる形のものが用いられ、成形品がストッカ33に到達した順に後工程31に渡される。
センサ34は、ストッカ33に設置され、ストッカ33に蓄積された成形品数を任意の蓄積数N1、N2、N3の3段階に検出し、段階に応じた信号42を射出成形機30に発信することができる。
[Example 2]
In Example 2, the injection molding method of Example 1 described above is applied to a production system, and these will be described with reference to the drawings.
FIG. 3 shows the configuration of the production system in this embodiment.
In FIG. 3, 30 is an injection molding machine, 31 is a post process, 32 is a conveying means, 33 is a stocker, and 34 is a sensor.
The injection molding machine 30 is an apparatus for obtaining a plastic molded product from pellet resin by a known process, and there may be one or a plurality of units.
Moreover, the post-process 31 performs the assembly process of the molded product shape | molded with the injection molding machine 30 and other components, or the molded products shape | molded by the some injection molding machine 30, for example.
The conveying means 32 has a role of cooling the molded product from the injection molding machine 30 to the post-process 31 at the same time as taking out the molded product molded by the injection molding machine 30 from the mold and transferring it to the post-process 31. From the injection molding machine 30 to the post process 31, it operates at a constant speed so as to have a predetermined cooling time.
The stocker 33 temporarily accumulates the molded products molded by the injection molding machine 30 and transported by the transport means 32, and for example, the stocker 33 is stacked from the bottom as shown in the figure. Are passed to the post-process 31 in the order of arrival.
The sensor 34 is installed in the stocker 33, detects the number of molded articles accumulated in the stocker 33 in three stages of arbitrary accumulation numbers N1, N2, and N3, and transmits a signal 42 corresponding to the stage to the injection molding machine 30. Can do.
図4は、本実施例におけるストッカの蓄積数、信号と射出成形機の動作の説明図である。
図4において、41はストッカ33の蓄積数、42は蓄積数41を検出したセンサ34が発信する蓄積数41に応じた信号、43は信号42、そしてそれを受信した射出成形機30の動作を示している。
センサ34はストッカ33の任意の蓄積数41を3段階N1、N2、N3(N1<N2<N3)に検出し、ストッカ33の蓄積数41がN1のときは信号42はS1を、蓄積数41がN2のときは信号42はS2を、蓄積数41がN3のときは信号42はS3を射出成形機30に発信する。
射出成形機30は信号42のS1を受信した場合は、保圧完了後から計量開始までの遅延時間、およびまたは型閉完了後から型締開始までの遅延時間T1を、信号42のS2を受信した場合は、保圧完了後から計量開始までの遅延時間、およびまたは型閉完了後から型締開始までの遅延時間T2を、信号42のS3を受信した場合は成形を停止し待機する。
FIG. 4 is an explanatory diagram of the accumulated number of stockers, signals, and operations of the injection molding machine in this embodiment.
In FIG. 4, reference numeral 41 denotes the number of stocks in the stocker 33, 42 denotes a signal corresponding to the number 41 stored by the sensor 34 that has detected the stock number 41, 43 denotes the signal 42, and the operation of the injection molding machine 30 that has received the signal 42. Show.
The sensor 34 detects an arbitrary accumulation number 41 of the stocker 33 in three stages N1, N2, and N3 (N1 <N2 <N3). When the accumulation number 41 of the stocker 33 is N1, the signal 42 indicates S1 and the accumulation number 41. When N is N2, the signal 42 transmits S2 to the injection molding machine 30, and when the accumulation number 41 is N3, the signal 42 transmits S3 to the injection molding machine 30.
When the injection molding machine 30 receives S1 of the signal 42, the injection molding machine 30 receives the delay time T1 from the completion of holding pressure to the start of measurement and / or the delay time T1 from completion of mold closing to the start of mold clamping, and receives S2 of the signal 42. In this case, the delay time from the completion of the pressure holding to the start of measurement and / or the delay time T2 from the completion of mold closing to the start of mold clamping, and when S3 of the signal 42 is received, the molding is stopped and waits.
図5は射出成形機30の成形動作フローチャートを示したものである。ここでは高圧型締を開始する時間を調整して成形サイクルを伸縮させる場合について述べるが、射出を開始する時間を調整する場合も同様である。
1サイクルの成形工程は、まず型閉51することから始まる。型閉後、低圧型締52に入り、ここでストッカ33の蓄積数41に応じた信号42によって動作を決定する。
信号42のS1を受信した場合は低圧型締52から高圧型締53までの遅延時間T1のタイマを、信号42のS2を受信した場合は低圧型締52から高圧型締53までの遅延時間T2のタイマをセットしカウントする。
FIG. 5 shows a molding operation flowchart of the injection molding machine 30. Here, the case where the molding cycle is expanded and contracted by adjusting the time for starting high-pressure mold clamping will be described, but the same applies to the case where the time for starting injection is adjusted.
The one-cycle molding process starts with the mold closing 51 first. After the mold is closed, the low-pressure mold clamping 52 is entered, where the operation is determined by the signal 42 corresponding to the number 41 stored in the stocker 33.
When S1 of the signal 42 is received, a timer with a delay time T1 from the low pressure mold clamping 52 to the high pressure mold clamping 53 is received. When S2 of the signal 42 is received, a delay time T2 from the low pressure mold clamping 52 to the high pressure mold clamping 53 is received. Set and count the timer.
信号42のS3を受信した場合は成形を停止し待機61する。低圧型締後52から高圧型締53までの遅延時間T1、T2経過後60に高圧型締53を行い、シリンダ内の樹脂を射出54する。その後、保圧55に移り保圧完了後に冷却56に入ると同時にストッカ33の蓄積数41に応じた信号42によって保圧完了55から計量開始63までの遅延時間の設定を行う。
この計量開始63までの遅延時間の設定に際し、信号42のS1を受信した場合は、保圧完了後55から計量開始63までの遅延時間T1、信号S2を受信した場合は保圧完了後55から計量開始63までの遅延時間T2のタイマをセットする。保圧完了55から計量開始63までの遅延時間T1,T2経過後62に計量を開始63する。
遅延時間のセットと平行して冷却56、型開57、エジェクタ58、成形品の取出し等のための待機59を行い、1サイクルを終了する。
When S3 of the signal 42 is received, the molding is stopped and the process waits 61. The high-pressure mold clamping 53 is performed 60 after the delay times T1 and T2 from the low-pressure mold clamping 52 to the high-pressure mold clamping 53, and the resin in the cylinder is injected 54. Thereafter, the process proceeds to the holding pressure 55 and enters the cooling 56 after completion of the holding pressure, and at the same time, a delay time from the completion of the holding pressure 55 to the start of measurement 63 is set by the signal 42 corresponding to the accumulated number 41 of the stocker 33.
When setting the delay time until the measurement start 63, when S1 of the signal 42 is received, the delay time T1 from 55 after the completion of pressure holding to the measurement start 63, and when receiving the signal S2, from 55 after the completion of pressure holding. A timer with a delay time T2 until the measurement start 63 is set. The metering is started 63 after the delay times T1 and T2 from the completion of the pressure holding 55 to the metering start 63 have elapsed.
In parallel with the set delay time, a standby 59 for cooling 56, mold opening 57, ejector 58, removal of a molded product, etc. is performed, and one cycle is completed.
つぎに、本実施例の生産システムを、図1、図3を参照して説明する。
射出成形機30で成形された成形品は金型から取出された後、搬送手段32にのせられ、所定の時間冷却後にストッカ33に到達する。後工程31はストッカ33に到達した順に成形品を受け取り、後処理を行う。
ストッカ33の蓄積数41がN1以下のときはセンサ34から信号42はS1が発信されている。
射出成形機30は型閉51、低圧型締52の完了後に信号42のS1に応じて、低圧型締52から高圧型締53まで遅延時間T1のタイマが設定される。遅延時間T1経過後60に高圧型締53を行い射出54する。
次いで、保圧後55、冷却56に入ると同時に保圧完了55から計量開始63まで遅延時間T1のタイマが設定される。遅延時間T2経過後62、計量63を開始する。同時に冷却56、型開57、エジェクタ58、成形品の取出し中の待機59を行う。このときの成形サイクルは通常サイクルであり、後工程31のタクトと一致しているため、ストッカ33の蓄積数41は増加しない。
Next, the production system of the present embodiment will be described with reference to FIGS.
The molded product molded by the injection molding machine 30 is taken out from the mold, placed on the conveying means 32, and reaches the stocker 33 after cooling for a predetermined time. The post-process 31 receives the molded products in the order of arrival at the stocker 33 and performs post-processing.
When the accumulation number 41 of the stocker 33 is N1 or less, S1 is transmitted from the sensor 34 as the signal 42.
In the injection molding machine 30, after completion of the mold closing 51 and the low pressure mold clamping 52, a timer with a delay time T1 is set from the low pressure mold clamping 52 to the high pressure mold clamping 53 in accordance with S1 of the signal 42. After the lapse of the delay time T1, the high pressure mold clamping 53 is performed 60 and the injection 54 is performed.
Next, after holding the pressure 55, the cooling 56 is entered, and at the same time, a timer with a delay time T1 is set from the pressure holding completion 55 to the measurement start 63. After delay time T2 elapses 62, weighing 63 is started. At the same time, the cooling 56, the mold opening 57, the ejector 58, and the standby 59 during taking out the molded product are performed. Since the molding cycle at this time is a normal cycle and coincides with the tact of the post-process 31, the accumulated number 41 of the stocker 33 does not increase.
後工程31で異常が発生して成形品を処理できなくなった場合、成形品はストッカ33に蓄積されていく。やがて蓄積数41がN2に達したときセンサ34により信号42のS2が発信される。射出成形機30は型閉51、低圧型締52の完了後に信号42のS1に応じて、低圧型締52から高圧型締53まで遅延時間T1のタイマが設定される。遅延時間T1経過後60に高圧型締53を行い射出54する。次いで保圧後55、冷却に入ると同時に保圧完了55から計量開始63まで遅延時間T1のタイマが設定される。遅延時間T2経過後62、計量63を開始する。同時に冷却56、型開57、エジェクタ58、成形品の取出し中の待機59を行う。この動作により型閉状態で待機することにより金型温度の低下を防ぎ、また計量完了64から射出開始51までの時間を通常サイクルと同等に保つことにより樹脂温度低下を防ぎながら、成形サイクルを伸縮する。後工程31が復帰すると、射出成形機30の延長時のサイクルに対し後工程31のタクトが短くなるため、成形品の供給量に対し後工程31の消化量が上回り、ストッカ33に蓄積された成形品は徐々に減少していく。ストッカ33の蓄積数41が再びN1以下に戻った時にセンサ34より信号S1が発信される。射出成形機30は型閉51、低圧型締52の完了後に信号42のS1に応じて、低圧型締52から高圧型締53までの遅延時間T1、および保圧完了55から計量開始63まで遅延時間T1が設定され通常サイクルに戻る。一方、後工程31に異常が発生し、復帰までの時間が長くなった場合、ストッカ33に蓄積される成形品は蓄積数41はN2を超えて増加し続け、やがて蓄積数41がN3に達したときセンサ34から信号S3が発信される。射出成形機30は信号42のS3に応じて、型閉51、低圧型締52後に型閉状態のまま停止し待機61する。   When an abnormality occurs in the post-process 31 and the molded product cannot be processed, the molded product is accumulated in the stocker 33. When the accumulated number 41 eventually reaches N2, the sensor 34 transmits S2 of the signal 42. In the injection molding machine 30, after completion of the mold closing 51 and the low pressure mold clamping 52, a timer with a delay time T1 is set from the low pressure mold clamping 52 to the high pressure mold clamping 53 in accordance with S1 of the signal 42. After the lapse of the delay time T1, the high pressure mold clamping 53 is performed 60 and the injection 54 is performed. Then, after holding pressure 55, a timer of delay time T1 is set from holding pressure completion 55 to measurement start 63 at the same time as cooling starts. After delay time T2 elapses 62, weighing 63 is started. At the same time, the cooling 56, the mold opening 57, the ejector 58, and the standby 59 during taking out the molded product are performed. This operation prevents the mold temperature from falling by waiting in the mold closed state, and keeps the time from the completion of measurement 64 to the start of injection 51 to be equal to the normal cycle, thereby preventing the resin temperature from falling and extending and contracting the molding cycle. To do. When the post-process 31 returns, the tact of the post-process 31 becomes shorter than the extended cycle of the injection molding machine 30, so that the digestion amount of the post-process 31 exceeds the supply amount of the molded product and is accumulated in the stocker 33. Molded articles will gradually decrease. When the accumulation number 41 of the stocker 33 returns to N1 or less again, a signal S1 is transmitted from the sensor 34. The injection molding machine 30 delays from the low pressure mold clamping 52 to the high pressure mold clamping 53 to the delay time T1 from the low pressure mold clamping 52 to the measurement start 63 according to S1 of the signal 42 after the mold closing 51 and the low pressure mold clamping 52 are completed. Time T1 is set and the process returns to the normal cycle. On the other hand, when an abnormality occurs in the post-process 31 and the time until return becomes longer, the number of accumulated articles 41 accumulated in the stocker 33 continues to increase beyond N2, and the accumulation number 41 eventually reaches N3. Then, a signal S3 is transmitted from the sensor 34. The injection molding machine 30 stops and waits 61 after the mold closing 51 and the low-pressure clamping 52 in accordance with S3 of the signal 42 while the mold is closed.
11:型閉工程
12:低圧型締工程
13:高圧型締工程
14:射出工程
15:保圧工程
16:冷却工程
17:計量工程
18:型開工程
19:エジェクタ工程
20:待機工程
22:高圧型締遅延工程
23:計量遅延工程
24:射出遅延工程
11: Mold closing process 12: Low pressure mold clamping process 13: High pressure mold clamping process 14: Injection process 15: Pressure holding process 16: Cooling process 17: Metering process 18: Mold opening process 19: Ejector process 20: Standby process 22: High pressure Clamping delay process 23: Weighing delay process 24: Injection delay process

Claims (2)

  1. 低圧型締工程、高圧型締工程、計量工程にて計量された樹脂を射出する射出工程および前記射出した樹脂を冷却する冷却工程を含む成形サイクルで成形された成形品を、ストッカに蓄積した後、後工程に供給する射出成形機を用いた成形品の製造方法であって、
    前記成形サイクルは、前記成形サイクルの時間を伸縮させる工程を有し、
    前記成形サイクルの時間を伸縮させる工程は、
    前記ストッカにおける前記成形品の蓄積量に応じて遅延時間を決定する工程と、
    前記樹脂の計量工程の開始時間と、前記低圧型締工程後の高圧型締工程開始時間または高圧型締工程後の射出工程開始時間とを、前記遅延時間遅らせる工程と、
    を含んでいることを特徴とする射出成形機を用いた成形品の製造方法。
    After accumulating in a stocker a molded product molded in a molding cycle including a low-pressure mold clamping process, a high-pressure mold clamping process, an injection process for injecting the resin weighed in the weighing process, and a cooling process for cooling the injected resin , and it supplies the higher rear Engineering, a method for producing a molded article using an injection molding machine,
    The molding cycle has a step of expanding and contracting the time of the molding cycle,
    The step of expanding and contracting the time of the molding cycle includes:
    Determining a delay time according to the amount of the molded product accumulated in the stocker;
    Delaying the start time of the metering step of the resin and the high pressure mold clamping process start time after the low pressure mold clamping process or the injection process start time after the high pressure mold clamping process; and
    Method for producing a molded article using an injection molding machine, characterized in that it contains.
  2. 前記計量工程の開始時間は、前記冷却工程開始時に、タイマに前記遅延時間をセットすることで遅らせることを特徴とする請求項1に記載の射出成形機を用いた成形品の製造方法。The method of manufacturing a molded article using an injection molding machine according to claim 1, wherein the start time of the weighing process is delayed by setting the delay time in a timer at the start of the cooling process.
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CN102785340A (en) * 2012-08-20 2012-11-21 江西科伦医疗器械制造有限公司 Plastic injection process for PVC (polyvinyl chloride) parts of infusion apparatuses

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JPH07121547B2 (en) * 1991-09-05 1995-12-25 日精樹脂工業株式会社 Control method of production line and injection molding machine used for the production line
JP3569554B2 (en) * 1994-11-17 2004-09-22 三菱樹脂株式会社 Blow molding control method
JP3128048B2 (en) * 1995-05-26 2001-01-29 宇部興産株式会社 Injection compression molding method and apparatus
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JP2002331560A (en) * 2001-05-10 2002-11-19 Matsushita Electric Ind Co Ltd Injection-molding system for in-line

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Publication number Priority date Publication date Assignee Title
CN102785340A (en) * 2012-08-20 2012-11-21 江西科伦医疗器械制造有限公司 Plastic injection process for PVC (polyvinyl chloride) parts of infusion apparatuses
CN102785340B (en) * 2012-08-20 2015-03-25 江西科伦医疗器械制造有限公司 Plastic injection process for PVC (polyvinyl chloride) parts of infusion apparatuses

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