JPH018344Y2 - - Google Patents
Info
- Publication number
- JPH018344Y2 JPH018344Y2 JP1983060826U JP6082683U JPH018344Y2 JP H018344 Y2 JPH018344 Y2 JP H018344Y2 JP 1983060826 U JP1983060826 U JP 1983060826U JP 6082683 U JP6082683 U JP 6082683U JP H018344 Y2 JPH018344 Y2 JP H018344Y2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- movable
- vacuum
- fixed
- cylinder
- 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
Links
- 238000001746 injection moulding Methods 0.000 claims description 20
- 238000000465 moulding Methods 0.000 description 13
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
(イ) 技術分野
本考案は、金型内を真空とした状態で射出成形
を行なう真空射出成形機に関するものである。[Detailed Description of the Invention] (a) Technical Field The present invention relates to a vacuum injection molding machine that performs injection molding with the inside of the mold being evacuated.
(ロ) 従来技術
従来の真空射出成形機としては、例えば第１図
に示すようなものがある。固定盤１０に固定金型
１１が取り付られ、可動盤１２に可動金型１３が
取り付けられる。可動盤１２は、タイバー１４に
移動可能に支持されており、型締シリンダ１５の
ピストンロツド１６と連結されている。固定金型
１１及び可動金型１３によつて形成されるキヤビ
テイ２２は、通路及び切換弁１８を介して真空タ
ンク１９と接続されている。真空タンク１９は真
空ポンプ２０によつて吸引されている。金型のキ
ヤビテイ２２内には射出装置２１から溶融樹脂を
射可能である。(b) Prior Art As a conventional vacuum injection molding machine, there is one shown in FIG. 1, for example. A fixed mold 11 is attached to a fixed platen 10, and a movable mold 13 is attached to a movable platen 12. The movable platen 12 is movably supported by tie bars 14 and connected to a piston rod 16 of a mold clamping cylinder 15. A cavity 22 formed by the fixed mold 11 and the movable mold 13 is connected to a vacuum tank 19 via a passage and a switching valve 18 . The vacuum tank 19 is suctioned by a vacuum pump 20. Molten resin can be injected into the cavity 22 of the mold from an injection device 21.
この従来の真空射出成形機は、第６図上側ａに
示すようなサイクルによつて作動する。まず、型
閉動作が行なわれる。すなわち、型締シリンダ１
５に比較的低い油圧が供給され可動盤１２が前進
し、可動金型１３が固定金型１１に接触する。次
いで、型締シリンダ１５の油圧を上昇させる昇圧
及び切換弁１８を開いて金型キヤビテイ２２を真
空とする真空引きとが同時に開始される。昇圧及
び真空引きの両動作が完了した時点で成形が開始
される。しかし、十分に高い真空度を必要とする
場合、金型キヤビテイ２２の容積が大きい場合等
には、真空引き時間が長くなり、昇圧が完了した
後も真空引きを行なう必要がある（第６図中のt1
時間）。このため、型閉動作から成形開始までの
間に長い時間を必要とし成形サイクルが長くなる
という問題点があつた。 This conventional vacuum injection molding machine operates according to a cycle as shown in FIG. 6, upper side a. First, a mold closing operation is performed. That is, mold clamping cylinder 1
5 is supplied with a relatively low hydraulic pressure, the movable platen 12 moves forward, and the movable mold 13 comes into contact with the fixed mold 11. Next, the pressure increase for increasing the hydraulic pressure of the mold clamping cylinder 15 and the evacuation for opening the switching valve 18 to evacuate the mold cavity 22 are simultaneously started. Molding is started when both the pressure raising and vacuuming operations are completed. However, if a sufficiently high degree of vacuum is required, or if the volume of the mold cavity 22 is large, the evacuation time will be longer and it will be necessary to continue evacuation even after the pressure has been increased (see Figure 6). middle t 1
time). For this reason, there was a problem in that a long time was required between the mold closing operation and the start of molding, resulting in a longer molding cycle.
(ハ) 考案の目的
本考案は、昇圧が完了するまでに必要な真空度
が得られるようにして成形サイクルを短縮するこ
とができる真空射出成形機を得ることを目的とし
ている。(c) Purpose of the invention The purpose of the invention is to obtain a vacuum injection molding machine that can shorten the molding cycle by obtaining the necessary degree of vacuum until the pressure increase is completed.
(ニ) 考案の構成
本考案は、可動盤を２つの部材から構成し、一
方を型締シリンダ側に連結すると共に他方に可動
金型を取り付け、２つの部材は液圧シリンダによ
つて互いに移動可能とすることにより、昇圧開始
前に可動金型を固定金型に接触させ、上記問題点
を解消する。すなわち、本考案による真空射出成
形機の型締装置は、固定金型が取り付けられる固
定盤と、固定盤とタイバーを介して連結された型
締シリンダと、型締シリンダの型締力が作用する
ロツドと連結され且つタイバーに対して軸方向に
移動自在に案内された第１可動盤と、第１可動盤
と固定盤との間においてタイバーに対して軸方向
に移動自在に支持され可動金型が取り付けられる
第２可動盤と、シリンダ本体が第１可動盤に取り
付けられピストンロツドが第２可動盤に連結され
た液圧シリンダと、固定金型及び可動金型の両方
又は一方を通して金型キヤビテイに連通する真空
引き通路と、真空引き通路に接続される真空源
と、真空引き通路の途中に設けられてこれを開閉
可能な切換弁と、型締め時に可動金型が固定金型
に接触するまでは液圧シリンダの押し側に油圧を
作用させると共に両金型の接触後は押し側の油圧
を解放させ、また両金型の接触と同時に切換弁を
開側に作動させる制御装置とから構成される。(d) Structure of the invention The invention consists of a movable platen made of two members, one of which is connected to the mold clamping cylinder side and a movable mold is attached to the other, and the two members are moved relative to each other by a hydraulic cylinder. By making this possible, the movable mold is brought into contact with the fixed mold before the start of pressure increase, and the above problem is solved. That is, the mold clamping device of the vacuum injection molding machine according to the present invention has a fixed plate to which a fixed mold is attached, a mold clamping cylinder connected to the fixed plate through tie bars, and a mold clamping force of the mold clamping cylinder acting. A first movable plate connected to the rod and guided so as to be movable in the axial direction relative to the tie bar, and a movable mold supported movably in the axial direction relative to the tie bar between the first movable plate and the fixed plate. a second movable platen to which a hydraulic cylinder is attached, a hydraulic cylinder whose cylinder body is attached to the first movable platen and whose piston rod is connected to the second movable platen, and a mold cavity through both or one of a fixed mold and a movable mold. A vacuum passage that communicates with the vacuum passage, a vacuum source connected to the vacuum passage, a switching valve installed in the middle of the vacuum passage that can open and close the vacuum passage, and a switch valve that connects the movable mold to the fixed mold during mold clamping. The control device is comprised of a control device that applies hydraulic pressure to the pushing side of the hydraulic cylinder, releases the hydraulic pressure on the pushing side after the two molds come into contact, and operates the switching valve to the open side at the same time as the two molds come into contact. Ru.
(ホ) 実施例
以下、本考案の実施例を添付図面の第２〜６図
に基づいて説明する。(E) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 2 to 6 of the accompanying drawings.
固定金型３０が取り付けられた固定盤３１と型
締シリンダ３２とが、タイバー３３によつて連結
されている。タイバー３３には、第１可動盤３４
及び第２可動盤３５がそれぞれ軸方向に移動自在
に支持されている。第１可動盤３４は、型締シリ
ンダ３２のピストンロツド３６と連結されてい
る。また、第１可動盤３４には液圧シリンダ３７
が取り付けられている。液圧シリンダ３７のピス
トンロツド３８は第１可動盤３４を貫通して第２
可動盤３５と連結されている。第２可動盤３５に
は可動金型３９が取り付けられる。可動金型３９
には真空引き通路４０が形成されており、真空引
き通路４０は切換弁４１を介して真空タンク４２
（真空源）に接続されている。真空タンク４２は
真空ポンプ４３によつて吸引されている。射出装
置４４は固定金型３０に接触して溶融樹脂を射出
可能である。型締シリンダ３２、液圧シリンダ３
７、切換弁４１、射出装置４４などの作動は、図
示してない制御装置によつて後述のように制御さ
れる。 A fixed platen 31 to which a fixed mold 30 is attached and a mold clamping cylinder 32 are connected by tie bars 33. The tie bar 33 has a first movable plate 34
and a second movable platen 35 are each supported movably in the axial direction. The first movable platen 34 is connected to a piston rod 36 of the mold clamping cylinder 32. Further, the first movable platen 34 includes a hydraulic cylinder 37.
is installed. The piston rod 38 of the hydraulic cylinder 37 passes through the first movable platen 34 and connects to the second movable platen 34.
It is connected to a movable platen 35. A movable mold 39 is attached to the second movable platen 35. Movable mold 39
A vacuum passage 40 is formed in the vacuum tank 42 through a switching valve 41.
(vacuum source). The vacuum tank 42 is suctioned by a vacuum pump 43. The injection device 44 is capable of injecting molten resin by contacting the fixed mold 30. Mold clamping cylinder 32, hydraulic cylinder 3
7. The operation of the switching valve 41, the injection device 44, etc. is controlled by a control device (not shown) as described below.
次に、作用について説明する。 Next, the effect will be explained.
成形サイクル開始時には、型締装置は第２図に
示す状態にあり、液圧シリンダ３７には押し側
（第２図中で左側の油圧）に油圧が供給されてい
る。この状態において、型締シリンダ３２に油圧
を供給し型閉動作を開始する。第３図に示すよう
に、可動金型３９が固定金型３０に接触すると、
液圧シリンダ３７の押し側に作用させていた油圧
を解放し（すなわち、液圧シリンダ３７には押し
側及び引き側共に油圧が作用しない状態となる）、
これと同時に切換弁４１を開き、真空引きを開始
する。この間も第１可動盤３４は前進を続ける
（すなわち、第１可動盤３４が第２可動盤３５に
接近する）。第１可動盤３４が、第４図に示すよ
うに、第２可動盤３５に密着すると、型締シリン
ダ３２の昇圧を開始する。すなわち、型締シリン
ダ３２に高い油圧を作用させ型締力を発生させ
る。型締力が所定の値に達するまでに金型キヤビ
テイ４６内は真空引きによつて所定の真空度に達
する。こうして昇圧及び真空引きが完了した時点
で、射出装置４４から金型キヤビテイ４６内に溶
融樹脂を射出する。次いで、この状態で所定時間
保持し、可塑化及び冷却を行なう。可塑化及び冷
却が完了すると、型締シリンダ３２の引き側（第
４図中で右側の油室）及び液圧シリンダ３７の引
き側（第４図中で右側の油室）に油圧を導入す
る。こうすることによつて、第１可動盤３４及び
第２可動盤３５は密着した状態のまま、型締シリ
ンダ３２側に引かれ、型開動作が行なわれる。第
５図に示すように、型開動作が完了すると、図示
してない成形品突出装置によつて成形品４５を突
出す。突出装置が初期位置に戻ると同時に液圧シ
リンダ３７の押し側に油圧を作用させ、第２可動
盤３５を固定盤３１側へ移動させる。これによつ
て第２図に示す状態に復帰し、１成形サイクルが
完了する。なお、切換弁４１は可動金型３９が固
定金型３０に接触した時点から成形の完了まで開
いておけばよい。 At the start of the molding cycle, the mold clamping device is in the state shown in FIG. 2, and hydraulic pressure is supplied to the hydraulic cylinder 37 on the pushing side (hydraulic pressure on the left side in FIG. 2). In this state, hydraulic pressure is supplied to the mold clamping cylinder 32 to start the mold closing operation. As shown in FIG. 3, when the movable mold 39 contacts the fixed mold 30,
Release the hydraulic pressure that was acting on the push side of the hydraulic cylinder 37 (that is, no hydraulic pressure acts on the hydraulic cylinder 37 on either the push side or the pull side),
At the same time, the switching valve 41 is opened and evacuation is started. During this time, the first movable plate 34 continues to move forward (that is, the first movable plate 34 approaches the second movable plate 35). When the first movable platen 34 comes into close contact with the second movable platen 35, as shown in FIG. 4, the pressurization of the mold clamping cylinder 32 starts to increase. That is, a high hydraulic pressure is applied to the mold clamping cylinder 32 to generate mold clamping force. By the time the mold clamping force reaches a predetermined value, the interior of the mold cavity 46 reaches a predetermined degree of vacuum due to evacuation. When the pressure increase and evacuation are completed in this manner, the molten resin is injected from the injection device 44 into the mold cavity 46. Next, this state is held for a predetermined period of time to perform plasticization and cooling. When plasticization and cooling are completed, hydraulic pressure is introduced into the pull side of the mold clamping cylinder 32 (oil chamber on the right side in Figure 4) and the pull side of the hydraulic cylinder 37 (oil chamber on the right side in Figure 4). . By doing so, the first movable platen 34 and the second movable platen 35 are pulled toward the mold clamping cylinder 32 side while remaining in close contact with each other, and a mold opening operation is performed. As shown in FIG. 5, when the mold opening operation is completed, the molded product 45 is ejected by a molded product ejection device (not shown). At the same time as the ejecting device returns to its initial position, hydraulic pressure is applied to the pushing side of the hydraulic cylinder 37 to move the second movable platen 35 toward the fixed platen 31 side. As a result, the state shown in FIG. 2 is restored, and one molding cycle is completed. Note that the switching valve 41 may be kept open from the time when the movable mold 39 contacts the fixed mold 30 until the completion of molding.
本考案の真空射出成形機による成形サイクルを
図示すると、第６図下側に示すようになる。この
図から明らかなように、型閉動作中に真空引きが
開始されるため、昇圧の完了とほぼ同時に真空引
きを完了させることができる。従つて、第６図上
側ａに示す従来の成形サイクルと比較してt1時間
だけ成形サイクル所要時間を短縮することができ
る。 The molding cycle of the vacuum injection molding machine of the present invention is illustrated in the lower part of FIG. 6. As is clear from this figure, since evacuation is started during the mold closing operation, evacuation can be completed almost simultaneously with the completion of pressure increase. Therefore, the time required for the molding cycle can be reduced by t 1 hour compared to the conventional molding cycle shown in FIG. 6, upper side a.
なお、上記実施例では、直圧型型締装置を有す
る真空射出成形機に本考案を適用したものである
が、トグル式型締装置を有する真空射出成形機に
も適用可能なことは明らかである。 In the above embodiment, the present invention is applied to a vacuum injection molding machine having a direct pressure mold clamping device, but it is clear that the present invention can also be applied to a vacuum injection molding machine having a toggle type mold clamping device. .
(ヘ) 考案の効果
以上説明してきたように、本考案によると、固
定金型が取り付けられる固定盤と、固定盤とタイ
バーを介して連結された型締シリンダと、型締シ
リンダの型締力が作用するロツド（実施例では、
ピストンロツド３６）と連結され且つタイバーに
対して軸方向に移動自在に案内された第１可動盤
と、第１可動盤と固定盤との間においてタイバー
に対して軸方向に移動自在に支持され可動金型が
取り付けられる第２可動盤と、シリンダ本体が第
１可動盤に取り付けられピストンロツドが第２可
動盤に連結された液圧シリンダと、固定金型及び
可動金型の両方又は一方を通して金型キヤビテイ
に連通する真空引き通路と、真空引き通路に接続
される真空源（真空タンク４２）と、真空引き通
路の途中に設けられてこれを開閉可能な切換弁
と、型締め時に可動金型が固定金型に接触するま
では液圧シリンダの押し側に油圧を作用させると
共に両金型の接触後は押し側の油圧を解放させ、
また両金型の接触と同時に切換弁を開側に作動さ
せる制御装置と、によつて真空射出成形機が構成
されるので、型閉動作中に真空引きを開始するこ
とができ成形サイクルを短縮することができる。(f) Effect of the invention As explained above, according to the invention, the fixed platen to which the fixed mold is attached, the clamping cylinder connected to the fixed platen through tie bars, and the mold clamping force of the clamping cylinder. The rod (in the example,
A first movable plate connected to the piston rod 36) and guided so as to be movable in the axial direction with respect to the tie bar, and a movable plate that is supported and movable in the axial direction with respect to the tie bar between the first movable plate and the fixed plate. A second movable platen to which a mold is attached, a hydraulic cylinder whose cylinder body is attached to the first movable platen and a piston rod connected to the second movable platen, and a mold through both or one of the fixed mold and the movable mold. A vacuum passage communicating with the cavity, a vacuum source (vacuum tank 42) connected to the vacuum passage, a switching valve provided in the middle of the vacuum passage that can open and close it, and a movable mold when the mold is clamped. Hydraulic pressure is applied to the pushing side of the hydraulic cylinder until it comes into contact with the fixed mold, and after both molds come into contact, the hydraulic pressure on the pushing side is released.
In addition, since the vacuum injection molding machine is configured with a control device that operates the switching valve to the open side at the same time that both molds come into contact, vacuuming can be started during the mold closing operation, shortening the molding cycle. can do.
第１図は従来の真空射出成形機を示す図、第２
図は本考案による真空射出成形機を示す図（成形
サイクル開始時の状態を示す図）、第３図は第２
図に示す真空射出成形機の金型接触時の状態を示
す図、第４図は第２図に示す真空射出成形機の昇
圧時の状態を示す図、第５図は第２図に示す真空
射出成形機の型開動作完了時の状態を示す図、第
６図は第１図に示す真空射出成形機及び第２図に
示す真空射出成形機の成形サイクルを示す図であ
る。
３１……固定盤、３２……型締シリンダ、３３
……タイバー、３４……第１可動盤、３５……第
２可動盤、３６……ピストンロツド、３７……液
圧シリンダ、３８……ピストンロツド、３９……
可動金型、４０……真空引き通路、４１……切換
弁、４２……真空タンク、４３……真空ポンプ、
４４……射出装置、４５……成形品。
Figure 1 shows a conventional vacuum injection molding machine, Figure 2 shows a conventional vacuum injection molding machine.
The figure shows the vacuum injection molding machine according to the present invention (the state at the start of the molding cycle), and Figure 3 shows the vacuum injection molding machine according to the present invention.
Figure 4 is a diagram showing the state of the vacuum injection molding machine shown in Figure 2 when the mold is in contact, Figure 4 is a diagram showing the state of the vacuum injection molding machine shown in Figure 2 when the pressure is increased, and Figure 5 is the vacuum shown in Figure 2. FIG. 6 is a diagram showing the state of the injection molding machine when the mold opening operation is completed, and is a diagram showing the molding cycles of the vacuum injection molding machine shown in FIG. 1 and the vacuum injection molding machine shown in FIG. 2. 31... Fixed plate, 32... Mold clamping cylinder, 33
...Tie bar, 34...First movable plate, 35...Second movable plate, 36...Piston rod, 37...Hydraulic cylinder, 38...Piston rod, 39...
Movable mold, 40... Vacuum passage, 41... Switching valve, 42... Vacuum tank, 43... Vacuum pump,
44... Injection device, 45... Molded product.
Claims (1)
タイバーを介して連結された型締シリンダと、型
締シリンダの型締力が作用するロツドと連結され
且つタイバーに対して軸方向に移動自在に案内さ
れた第１可動盤と、第１可動盤と固定盤との間に
おいてタイバーに対して軸方向に移動自在に支持
され可動金型が取り付けられる第２可動盤と、シ
リンダ本体が第１可動盤に取り付けられピストン
ロツドが第２可動盤に連結された液圧シリンダ
と、固定金型及び可動金型の両方又は一方を通し
て金型キヤビテイに連通する真空引き通路と、真
空引き通路に接続される真空源と、真空引き通路
の途中に設けられてこれを開閉可能な切換弁と、
型締め時に可動金型が固定金型に接触するまでは
液圧シリンダの押し側に油圧を作用させると共に
両金型の接触後は押し側の油圧を解放させ、また
両金型の接触と同時に切換弁を開側に作動させる
制御装置とを有する真空射出成形機。 A fixed plate to which a fixed mold is attached, a mold clamping cylinder connected to the fixed plate via a tie bar, and a rod on which the mold clamping force of the mold clamp cylinder acts, and is movable in the axial direction with respect to the tie bar. a guided first movable plate; a second movable plate that is movably supported in the axial direction with respect to the tie bar between the first movable plate and the fixed plate and to which a movable mold is attached; and a cylinder body that is movable in the first movable plate. a hydraulic cylinder mounted on a platen and having a piston rod connected to a second movable platen; a vacuum passage communicating with the mold cavity through both or one of the fixed mold and the movable mold; and a vacuum connected to the vacuum passage. a switching valve provided in the middle of the vacuum passage and capable of opening and closing the vacuum passage;
During mold clamping, hydraulic pressure is applied to the push side of the hydraulic cylinder until the movable mold comes into contact with the fixed mold, and after the two molds come into contact, the hydraulic pressure on the push side is released, and at the same time as both molds come into contact. A vacuum injection molding machine having a control device that operates a switching valve to the open side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6082683U JPS59166923U (en) | 1983-04-25 | 1983-04-25 | vacuum injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6082683U JPS59166923U (en) | 1983-04-25 | 1983-04-25 | vacuum injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59166923U JPS59166923U (en) | 1984-11-08 |
| JPH018344Y2 true JPH018344Y2 (en) | 1989-03-06 |
Family
ID=30191059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6082683U Granted JPS59166923U (en) | 1983-04-25 | 1983-04-25 | vacuum injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59166923U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4825749A (en) * | 1971-08-05 | 1973-04-04 |
-
1983
- 1983-04-25 JP JP6082683U patent/JPS59166923U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4825749A (en) * | 1971-08-05 | 1973-04-04 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59166923U (en) | 1984-11-08 |
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