JPH0312529B2 - - Google Patents
Info
- Publication number
- JPH0312529B2 JPH0312529B2 JP60022335A JP2233585A JPH0312529B2 JP H0312529 B2 JPH0312529 B2 JP H0312529B2 JP 60022335 A JP60022335 A JP 60022335A JP 2233585 A JP2233585 A JP 2233585A JP H0312529 B2 JPH0312529 B2 JP H0312529B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- ram
- opening
- output
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000000748 compression moulding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は充填後一旦金型を開いた後、再度型閉
じを行なうことにより成形を行なう射出による圧
縮成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an injection compression molding method in which molding is performed by once opening a mold after filling and then closing the mold again.
（従来技術）
射出成形機によつて一般の成形品を成形する場
合、通常、型締−射出によるキヤビテイ内への樹
脂の充填−型開の順序で行なわれるが、特殊な成
形品、例えば光デイスクレプリカや薄肉レンズを
成形する場合には、完全に型締めを行なわずパー
テイングラインに開きがある状態で射出を行な
い、射出による充填完了後に完全に型締めを行な
う、という方法が一般に採用されている。(Prior art) When a general molded product is molded using an injection molding machine, the sequence is usually mold clamping, filling of the cavity with resin by injection, and mold opening. When molding disk replicas or thin lenses, the general method used is to perform injection with an opening at the parting line without completely clamping the mold, and then completely clamp the mold after filling is completed by injection. ing.
（発明が解決しようとする問題点）
上記のような従来例では、充填後に完全に型締
めを行なうため、成形品の全面に圧力がかから
ず、ゲートの近辺にのみ圧力が過大にかかること
になり、その結果、内周部分のみ内部応力が増大
するため、この部分での複屈折率が高くなる、と
いう欠点があつた。(Problems to be solved by the invention) In the conventional example described above, the mold is completely clamped after filling, so pressure is not applied to the entire surface of the molded product, and excessive pressure is applied only to the vicinity of the gate. As a result, the internal stress increases only in the inner peripheral portion, resulting in a disadvantage that the birefringence in this portion increases.
さらに充填する際の金型の開き量は精確でなけ
ればならないが、この開き量を調整するのに時間
がかかるためサイクルタイムが非常に長くなると
いう問題があつた。 Furthermore, the opening amount of the mold during filling must be accurate, but it takes time to adjust this opening amount, which poses the problem of extremely long cycle times.
本発明はかかる問題点を解決するためになされ
たもので、金型の開き量を精確かつ容易に測定す
ることができしかも低複屈折率の成形品が得られ
る射出による圧縮成形方法を得ることを目的とす
る。 The present invention has been made in order to solve these problems, and provides a compression molding method using injection that allows the amount of mold opening to be accurately and easily measured and that also allows molded products with a low birefringence index to be obtained. With the goal.
（問題を解決するための手段）
本発明は金型の開き量に応じて伸縮するスピン
ドルを備えたダイアルゲージによつて金型の開き
量を検知し、しかも充填後の圧縮時に、検知した
型開き量に応じて、型締ラムと反抗ラムとの出力
の差に基づく圧縮力を段階的に変化させるという
ものである。(Means for solving the problem) The present invention detects the amount of opening of the mold by a dial gauge equipped with a spindle that expands and contracts according to the amount of opening of the mold, and moreover, the detected mold The compression force based on the difference in output between the mold clamping ram and the reaction ram is changed in stages according to the opening amount.
（実施例）
以下図面に示す実施例を参照しながら本発明を
説明すると、第１図に示すように、固定盤１には
固定側金型１ａが、また可動盤２には可動側金型
２ａが取り付けられており、可動盤２は型閉ラム
３に連結され往復動自在となつている。固定盤１
には、金型１ａを間にして一対の反抗ラム用シリ
ンダ４，５が取り付けられており、それぞれのシ
リンダ４，５に装着された反抗ラム４ａ，５ａの
先端部は可動側金型２ａに取り付けられている。(Embodiment) The present invention will be described below with reference to the embodiment shown in the drawings. As shown in FIG. 2a is attached, and the movable platen 2 is connected to the mold closing ram 3 so as to be able to reciprocate. Fixed plate 1
A pair of reaction ram cylinders 4 and 5 are installed with the mold 1a in between, and the tips of the reaction rams 4a and 5a attached to the respective cylinders 4 and 5 are attached to the movable mold 2a. attached.
同図において、６は型閉ラム３が摺動自在に嵌
挿されたシリンダ、７は該シリンダ６に油圧を供
給するための油圧系であつて、油圧ポンプ８から
の油圧路は２系統に分岐しており、その中の一方
の管路９はシリンダ６の底部に接続されており、
他方の管路１０はシリンダ６の開口後部側に接続
されている。そして油圧路の分岐点には切換弁１
１が設けられており、また一方の管路９にはリリ
ーフバルブ１２が設けられている。 In the figure, 6 is a cylinder into which the mold closing ram 3 is slidably inserted, 7 is a hydraulic system for supplying hydraulic pressure to the cylinder 6, and there are two hydraulic lines from the hydraulic pump 8. It is branched, and one of the pipe lines 9 is connected to the bottom of the cylinder 6,
The other pipe line 10 is connected to the opening rear side of the cylinder 6. And a switching valve 1 is installed at the branch point of the hydraulic path.
1 is provided, and one of the pipe lines 9 is provided with a relief valve 12.
さらに同図において１３は反抗ラム４ａ，５ａ
用の油圧系であつて、この油圧系には、油圧ポン
プ１４、切換弁１５、カツトオフ弁１６及びリリ
ーフバルブ１７が順次設けられている。 Furthermore, in the same figure, 13 is a rebellious ram 4a, 5a.
This hydraulic system is provided with a hydraulic pump 14, a switching valve 15, a cut-off valve 16, and a relief valve 17 in this order.
上記固定盤１には、反抗行程用のダイアルゲー
ジ１８と圧縮行程用のダイアルゲージ１９とが取
り付けられており、それぞれのダイアルゲージ１
８，１９は、ゲージ本体１８ａ，１９ａに対して
伸縮自在なスピンドル２０，２１を有している。
該スピンドル２０，２１の先端は、可動側金型２
ａに取り付けられたストツパ２１ａに常時当接す
るようになつている。尚、２２，２３は、ダイア
ルゲージ１８，１９のそれぞれに接続されたアン
プであつて、アンプ２２，２３からの出力は、図
示しない制御装置に入力されるようになつてい
る。 A dial gauge 18 for the reaction stroke and a dial gauge 19 for the compression stroke are attached to the fixed platen 1, and each dial gauge 1
8 and 19 have spindles 20 and 21 that are extendable and retractable with respect to the gauge bodies 18a and 19a.
The tips of the spindles 20 and 21 are connected to the movable mold 2
It is designed to constantly come into contact with a stopper 21a attached to a. Note that 22 and 23 are amplifiers connected to the dial gauges 18 and 19, respectively, and outputs from the amplifiers 22 and 23 are input to a control device (not shown).
次に上記構成に係る装置の作用について述べ
る。シリンダ６に管路９から油圧を供給すると、
型閉ラム３は図面において右方向に移動すること
になり、これとともに可動側金型２ａも右動す
る。そして完全に型締めが行なわれ、これが図示
しないリミツトスイツチによつて確認されると、
次に反抗ラム用シリンダ４，５に油圧が供給され
ることになり、これによつて可動側金型２ａは押
し戻され左方向に移動することになる。この反抗
ラム４ａ，５ａによる金型２ａの開き量は、ダイ
アルゲージ１８によつて検知され、所定の開き量
が得られると、信号を出力し、この信号はカツト
オフ弁１６に供給されることになり、該弁１６は
シリンダ４，５への油圧の供給をカツトする。 Next, the operation of the device having the above configuration will be described. When hydraulic pressure is supplied to the cylinder 6 from the pipe 9,
The mold closing ram 3 moves to the right in the drawing, and the movable mold 2a also moves to the right. When the mold is completely clamped and this is confirmed by a limit switch (not shown),
Next, hydraulic pressure is supplied to the reaction ram cylinders 4 and 5, whereby the movable mold 2a is pushed back and moved to the left. The opening amount of the mold 2a by the reaction rams 4a and 5a is detected by the dial gauge 18, and when a predetermined opening amount is obtained, a signal is output, and this signal is supplied to the cut-off valve 16. Therefore, the valve 16 cuts off the supply of hydraulic pressure to the cylinders 4 and 5.
この状態で射出を行ない、キヤビテイに樹脂を
充填する。充填が完了すると、再びシリンダ６に
油圧が供給され圧縮行程に入ることになり、可動
側金型２ａは固定側金型１ａに接近する。この移
動距離は、ダイアルゲージ１９によつてモニタリ
ングされており、所定の金型の開き量に達する
と、該ゲージ１９は信号を出力し、この信号はア
ンプ２３を介して図示しない制御装置に供給され
ることになり、可動側金型２ａの移動は停止す
る。 In this state, injection is performed to fill the cavity with resin. When the filling is completed, hydraulic pressure is supplied to the cylinder 6 again to enter the compression stroke, and the movable mold 2a approaches the fixed mold 1a. This moving distance is monitored by a dial gauge 19, and when a predetermined mold opening amount is reached, the gauge 19 outputs a signal, and this signal is supplied to a control device (not shown) via an amplifier 23. As a result, the movement of the movable mold 2a is stopped.
第２図は、以上の行程とシリンダ４，５，６の
油圧Ｐとの関係を示すものである。同図からあき
らかなように、圧縮行程Ｂにおいては、シリンダ
４，５，６の油圧は段階的に変化していることが
わかる。この段階的制御は、リリーフ弁１２，１
７によつて行なわれる。これによれば、圧縮行程
における圧縮力をいかようにも設定することが可
能である。たとえば、(i)型閉ラム３の出力を変化
させることなく、反抗ラム４ａ，５ａの出力を落
してもよく、あるいは(ii)型閉ラム３の出力を増加
させ、反抗ラム４ａ，５ａの出力をそのままに保
持するかまたは落してもよい。この場合には、最
大圧縮力を得ることが可能である。上記(i)は低圧
の圧縮成形が適する成形品に適用され、(ii)は高圧
の圧縮成形が適する成形品に適用される。 FIG. 2 shows the relationship between the above stroke and the oil pressure P of the cylinders 4, 5, and 6. As is clear from the figure, in the compression stroke B, the oil pressures of the cylinders 4, 5, and 6 change in stages. This stepwise control is based on the relief valves 12, 1
7. According to this, it is possible to set the compression force in the compression stroke in any way. For example, (i) the output of the rebellious rams 4a, 5a may be reduced without changing the output of the mold-closing ram 3, or (ii) the output of the mold-closing ram 3 may be increased and the output of the rebellious rams 4a, 5a may be reduced. The output may be held as is or dropped. In this case it is possible to obtain maximum compressive forces. The above (i) applies to molded products suitable for low-pressure compression molding, and (ii) applies to molded products suitable for high-pressure compression molding.
同図において、Ｐは完全な型締めの終了点、Ｑ
は反抗の終了点、Ｒは圧縮の終了点、Ｓは圧縮後
の最終開きを示す点、Ｔは型開開始点を示すもの
で、さらにＡは反抗行程、Ｂは圧縮行程、Ｃは補
圧行程を示す。 In the figure, P is the end point of complete mold clamping, and Q
is the end point of resistance, R is the end point of compression, S is the point indicating the final opening after compression, T is the starting point of mold opening, and A is the reaction stroke, B is the compression stroke, and C is the compensation pressure. Show the itinerary.
尚、T1、T2、T3はそれぞれタイマの設定時間
を示し、P1は型閉ラムの出力を、P2は反抗ラム
の出力を示している。 Note that T 1 , T 2 , and T 3 each indicate the set time of the timer, P 1 indicates the output of the mold closing ram, and P 2 indicates the output of the repulsion ram.
通常、T1の満了点と反抗による所定の金型の
開き量が得られる時間は一致するが、仮りにT1
が満了してもダイアルゲージ１８が該開き量を確
認しない限り、開き量不足として製品不良の警報
が出されることになる。またT2が満了すると、
ＢからＣに移行することになる。尚、成形品の良
否は、T3が満了した時点でダイアルゲージ１９
の出力がOKであれば良品とみなす。 Normally, the expiration point of T 1 and the time at which a predetermined amount of mold opening due to resistance is obtained coincide, but if T 1
Even after expiration, unless the dial gauge 18 confirms the opening amount, an alarm will be issued indicating that the opening amount is insufficient and the product is defective. Also, when T 2 expires,
It will move from B to C. The quality of the molded product can be determined by checking the dial gauge 19 at the end of T3 .
If the output is OK, it is considered to be a good product.
（効果）
本発明は以上からあきらかなように、金型の開
き量をダイアルゲージを用いて検知するので、開
き量が容易かつ精確に設定されることになる。(Effects) As is clear from the above, in the present invention, the opening amount of the mold is detected using a dial gauge, so the opening amount can be set easily and accurately.
さらに圧縮時、型締ラムと反抗ラムとの出力の
差に基づく圧縮力を段階的に変化させるので、成
形品に応じた圧力が得られることになる。 Furthermore, during compression, the compression force is changed in stages based on the difference in output between the mold clamping ram and the repulsion ram, so that a pressure corresponding to the molded product can be obtained.
第１図は本発明に使用される射出成形機の断面
図、第２図は各行程におけるシリンダの油圧の変
化を示す説明図である。
１ａ……固定側金型、２ａ……可動側金型、３
……型閉ラム、４ａ，５ａ……反抗ラム、１８，
１９……ダイアルゲージ。
FIG. 1 is a sectional view of an injection molding machine used in the present invention, and FIG. 2 is an explanatory diagram showing changes in cylinder oil pressure in each stroke. 1a...Fixed side mold, 2a...Movable side mold, 3
...Mold-closing ram, 4a, 5a...Rebellious ram, 18,
19...Dial gauge.
Claims (1)
にストツパを取り付けるとともに他方に該ストツ
パと常時当接し両金型の間隔に応じて伸縮するス
ピンドルを備えたダイアルゲージを取り付けて型
開き量を検知し、その検知した型開き量に応じて
型締ラムと反抗ラムまたはそれらの何れか一方の
出力を変化させることにより、該型締ラムと反抗
ラムとの出力の差に基づく圧縮力を段階的に変化
させることを特徴とする射出による圧縮成形方
法。1 Attach a stopper to either the movable mold or the fixed mold, and attach a dial gauge to the other with a spindle that is in constant contact with the stopper and expands and contracts according to the distance between the two molds to control the amount of mold opening. By detecting the amount of mold opening and changing the output of the mold clamping ram and/or the repulsion ram according to the detected mold opening amount, the compression force based on the difference in output between the mold clamping ram and the repulsion ram is adjusted in stages. A compression molding method using injection characterized by changing the
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2233585A JPS61205111A (en) | 1985-02-07 | 1985-02-07 | Compression molding method based on injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2233585A JPS61205111A (en) | 1985-02-07 | 1985-02-07 | Compression molding method based on injection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61205111A JPS61205111A (en) | 1986-09-11 |
| JPH0312529B2 true JPH0312529B2 (en) | 1991-02-20 |
Family
ID=12079833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2233585A Granted JPS61205111A (en) | 1985-02-07 | 1985-02-07 | Compression molding method based on injection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61205111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016083777A (en) * | 2014-10-22 | 2016-05-19 | 住友重機械工業株式会社 | Injection molding machine |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6371329A (en) * | 1986-09-12 | 1988-03-31 | Matsushita Electric Ind Co Ltd | Manufacture of replica plate |
| JP2525222B2 (en) * | 1988-04-26 | 1996-08-14 | ファナック株式会社 | Molding control method for injection molding machine |
| JPH0834738B2 (en) * | 1991-01-31 | 1996-03-29 | 株式会社日本製鋼所 | Injection compression molding method |
| US5582782A (en) * | 1995-03-01 | 1996-12-10 | Kato; Kazuo | Method of stopping a die of an injection molding machine and a die clamping apparatus |
| JP2005312219A (en) | 2004-04-22 | 2005-11-04 | Minebea Co Ltd | Motor core having three-layer insulation coating film structure and method for manufacturing the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4866659A (en) * | 1971-12-16 | 1973-09-12 | ||
| JPS57187231A (en) * | 1981-05-13 | 1982-11-17 | Matsushita Electric Ind Co Ltd | Mold apparatus for compression molding of resin |
| JPS59232835A (en) * | 1983-06-15 | 1984-12-27 | Hitachi Ltd | Metallic mold for injection compression molding and molding method using the same |
-
1985
- 1985-02-07 JP JP2233585A patent/JPS61205111A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4866659A (en) * | 1971-12-16 | 1973-09-12 | ||
| JPS57187231A (en) * | 1981-05-13 | 1982-11-17 | Matsushita Electric Ind Co Ltd | Mold apparatus for compression molding of resin |
| JPS59232835A (en) * | 1983-06-15 | 1984-12-27 | Hitachi Ltd | Metallic mold for injection compression molding and molding method using the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016083777A (en) * | 2014-10-22 | 2016-05-19 | 住友重機械工業株式会社 | Injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61205111A (en) | 1986-09-11 |
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