JPH0511533B2 - - Google Patents
Info
- Publication number
- JPH0511533B2 JPH0511533B2 JP61240906A JP24090686A JPH0511533B2 JP H0511533 B2 JPH0511533 B2 JP H0511533B2 JP 61240906 A JP61240906 A JP 61240906A JP 24090686 A JP24090686 A JP 24090686A JP H0511533 B2 JPH0511533 B2 JP H0511533B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- compression
- movable mold
- screw
- injection
- 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 21
- 238000007906 compression Methods 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 238000000748 compression moulding Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 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)
- Moulds For Moulding Plastics Or The Like (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〕 本発明は射出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.
従来から、レンズ成形、デイスク成形等の形状
精度とともに内部歪が小さいことが要求される成
形品の成形には、固定金型に対し、移動金型を圧
縮代だけ開いた状態で金型内に溶融樹脂を充填
し、その後移動金型を前進させ、前記圧縮代を閉
じるように成した射出圧縮成形方法が行われてい
る。
Traditionally, when molding products that require both shape accuracy and small internal distortion, such as lens molding and disk molding, a movable mold is placed in the mold with the compression width opened, in contrast to a fixed mold. An injection compression molding method is used in which the mold is filled with molten resin, and then a movable mold is moved forward to close the compression margin.
しかしながら、この金型の圧縮動作は、金型内
への溶融樹脂の充填が終了した直後、又は充填完
了後所定の時間経過後行つている。従つて、金型
の圧縮動作開始時は、充填開始時より相当時間が
経過しており、金型内の樹脂はキヤビテイ表面と
接触した部分から冷却固化が始まつているため、
そのまヽ圧縮を行うと、内部歪の発生は避けられ
ない。 However, this compression operation of the mold is performed immediately after the filling of the molten resin into the mold is completed, or after a predetermined period of time has elapsed after the filling is completed. Therefore, when the compression operation of the mold starts, a considerable amount of time has elapsed since the start of filling, and the resin in the mold has started to cool and solidify from the part that came into contact with the cavity surface.
If compression is performed as is, the occurrence of internal distortion is unavoidable.
発明者は前述の欠点を取除くため、移動金型を
進退させる型締シリンダの移動を停止させて、固
定金型に対し、移動金型を圧縮代だけ開いた状態
で金型内に溶融樹脂を充填し、その後移動金型を
前進させ、前記圧縮代を閉じる射出圧縮成形方法
において、
射出充填中のスクリユが射出ストローク中の任
意に設定した設定位置に達した時、移動金型の前
進動作を開始するようにしたことを特徴とする射
出圧縮成形方法とした。
In order to eliminate the above-mentioned drawbacks, the inventor stopped the movement of the mold clamping cylinder that moves the movable mold forward and backward, and released the molten resin into the mold with the movable mold open by the compression amount relative to the fixed mold. In the injection compression molding method in which the movable mold is moved forward and the compression allowance is closed, when the screw being injected and filled reaches an arbitrarily set position during the injection stroke, the movable mold moves forward. This is an injection compression molding method characterized by starting the injection compression molding process.
そのため金型内に充填した溶融樹脂は、充填中
のまだ冷却固化しないうちに圧縮動作を行うた
め、内部歪の発生が防止される。
Therefore, the molten resin filled in the mold is compressed before it is cooled and solidified during filling, so that internal distortion is prevented from occurring.
次に第１図により本発明の１実施例を説明する
と、１は射出圧縮用成形機で、スクリユ２が射出
シリンダ３により軸方向に進退可能で、かつ油圧
モータ４により回転可能に加熱シリンダ５に装着
されている、６は移動板７に取付られた移動金型
で型締シリンダ８により固定板９に取付られた固
定金型１０に対し、進退し、前記固定金型１０と
係合して金型キヤビテイ１１を形成するようにな
つている。このキヤビテイ１１は成形に際し、予
め圧縮代δを残して溶融樹脂の充填を行い、充填
途中でこの圧縮代δを閉じるようになつている。
１２はスクリユ２の位置を検出する位置検出装置
で、スクリユ位置設定装置１３ないし１６に設定
したスクリユ位置と、位置検出装置１２の検出す
る値とを比較器１７ないし２０で比較し、任意に
設定したスクリユ位置における、スクリユ速度お
よび型締圧力の制御に用いるようになつている。
２１は型開き量を検出する検出装置である。２２
は圧縮量設定装置で、比較器２３が前記検出装置
２１を検出した値と圧縮量設定装置２２に設定し
た圧縮代δとを比較し、検出値が設定値を越えた
とき比較器２３が信号を発するようになつてい
る。２４ないし２８は圧力設定器で、圧力制定器
２４ないし２７は夫々前記スクリユ位置設定器１
３ないし１６に設定したスクリユ位置における型
締圧力を設定し、圧力設定器２８は型開き量が圧
縮代δより大きくなつた時点の型締圧力を設定す
るものである。２９はスイツチで状況により接点
ａないしｅの選択をすることが出来、射出ストロ
ーク中の任意の位置又は金型キヤビテイ１１内の
充填樹脂により押された移動金型６が、圧縮量設
定装置２１に設定された圧縮代δより大きく開き
始めた時に圧縮が開始するようになつている。３
０は型締シリンダ８を制御する電磁切換弁、３１
は型締シリンダ８の圧力設定用の電磁リリーフ弁
である。
Next, one embodiment of the present invention will be described with reference to FIG. 1. Reference numeral 1 denotes an injection compression molding machine, in which a screw 2 is movable in the axial direction by an injection cylinder 3 and a heating cylinder 5 is rotatable by a hydraulic motor 4. 6 is a movable mold attached to a movable plate 7, which moves forward and backward with respect to a fixed die 10 attached to a fixed plate 9 by a mold clamping cylinder 8, and engages with the fixed die 10. The mold cavity 11 is formed by the following steps. During molding, this cavity 11 is filled with molten resin in advance, leaving a compression allowance δ, and the compression allowance δ is closed during filling.
Reference numeral 12 denotes a position detection device for detecting the position of the screw 2, which compares the screw position set in the screw position setting devices 13 to 16 with the value detected by the position detection device 12 using comparators 17 to 20, and sets it arbitrarily. It is designed to be used to control the screw speed and mold clamping pressure at the screw position.
21 is a detection device for detecting the amount of mold opening. 22
is a compression amount setting device, which compares the value detected by the detection device 21 by the comparator 23 with the compression amount δ set in the compression amount setting device 22, and when the detected value exceeds the set value, the comparator 23 outputs a signal. It is beginning to emit. 24 to 28 are pressure setting devices, and pressure setting devices 24 to 27 are the screw position setting devices 1, respectively.
The mold clamping pressure at screw positions set from 3 to 16 is set, and the pressure setting device 28 sets the mold clamping pressure at the time when the mold opening amount becomes larger than the compression allowance δ. Reference numeral 29 is a switch that can select contact points a to e depending on the situation, and the movable mold 6 pressed by the filling resin in the mold cavity 11 or at any position during the injection stroke is set to the compression amount setting device 21. Compression starts when the gap begins to open larger than the set compression margin δ. 3
0 is an electromagnetic switching valve that controls the mold clamping cylinder 8; 31
is an electromagnetic relief valve for setting the pressure of the mold clamping cylinder 8.
以上説明したような構成となつており、成形運
転に際し、予め圧縮代δを残して型閉を行い、キ
ヤビテイ１１内に溶融樹脂を充填する。充填中の
任意の位置、例えば設定器１５に設定したスクリ
ユ位置にスクリユ２が到達した時、圧力設定器２
７に設定した圧力により電磁リリーフ弁３１は制
御され、電磁切換弁３０はＢ位置に切換り、型締
シリンダ８により移動金型６の前進、即ち型圧縮
が行われる。 The structure is as described above, and during the molding operation, the mold is closed leaving a compression allowance δ in advance, and the cavity 11 is filled with molten resin. When the screw 2 reaches an arbitrary position during filling, for example, the screw position set on the setting device 15, the pressure setting device 2
The electromagnetic relief valve 31 is controlled by the pressure set at 7, the electromagnetic switching valve 30 is switched to the B position, and the mold clamping cylinder 8 moves the movable mold 6 forward, that is, compresses the mold.
以上説明したように、射出ストローク中の任意
に定めたスクリユ位置により、型圧縮が行われ、
当初に掲げた欠点を取除くことが出来る。
As explained above, mold compression is performed by an arbitrarily determined screw position during the injection stroke.
It is possible to eliminate the shortcomings listed at the beginning.
第１図は本発明の１実施例を示す図。
２……スクリユ、６……移動金型、７……移動
板、８……型締シリンダ、１０……固定金型、１
１……金型キヤビテイ、１２……スクリユ位置検
出装置、１３〜１６……スクリユ位置設定装置、
１７〜２０，２３……比較器、２１……型開き量
検出装置、２２……圧縮量設定装置、２４〜２８
……圧力設定器、２９……スイツチ、３０……電
磁切換弁、３１……電磁リリーフ弁。
FIG. 1 is a diagram showing one embodiment of the present invention. 2... Screw, 6... Moving mold, 7... Moving plate, 8... Mold clamping cylinder, 10... Fixed mold, 1
1...Mold cavity, 12...Screw position detection device, 13-16...Screw position setting device,
17-20, 23... Comparator, 21... Mold opening amount detection device, 22... Compression amount setting device, 24-28
...Pressure setting device, 29...Switch, 30...Solenoid switching valve, 31...Solenoid relief valve.
Claims (1)
停止させて、固定金型に対し、移動金型を圧縮代
だけ開いた状態で金型内に溶融樹脂を充填し、そ
の後移動金型を前進させ、前記圧縮代を閉じる射
出圧縮成形方法において、 射出充填中のスクリユが射出ストローク中の任
意に設定した設定位置に達した時、前記移動金型
の前進動作を開始するようにしたことを特徴とす
る射出圧縮成形方法。[Scope of Claims] 1. Stopping the movement of a clamping cylinder that moves the movable mold forward and backward, and filling the mold with molten resin with the movable mold open by a compression amount with respect to the fixed mold, In an injection compression molding method in which the movable mold is then moved forward and the compression allowance is closed, when the screw being injected and filled reaches an arbitrarily set position during the injection stroke, the forward motion of the movable mold is started. An injection compression molding method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24090686A JPS6394807A (en) | 1986-10-09 | 1986-10-09 | Injection compression molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24090686A JPS6394807A (en) | 1986-10-09 | 1986-10-09 | Injection compression molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6394807A JPS6394807A (en) | 1988-04-25 |
| JPH0511533B2 true JPH0511533B2 (en) | 1993-02-15 |
Family
ID=17066433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24090686A Granted JPS6394807A (en) | 1986-10-09 | 1986-10-09 | Injection compression molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6394807A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01241420A (en) * | 1988-03-24 | 1989-09-26 | Komatsu Ltd | Molding process and molding device of injection compression molding machine |
| JPH0729350B2 (en) * | 1988-07-18 | 1995-04-05 | アイダエンジニアリング株式会社 | Injection molding method with pressurization |
| US5415817A (en) * | 1993-10-22 | 1995-05-16 | Industrial Technology Research Institute | Process for molding plastic lenses |
| JP2556444B2 (en) * | 1994-04-20 | 1996-11-20 | ファナック株式会社 | Molding control method for injection molding machine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54148055A (en) * | 1978-05-13 | 1979-11-19 | Daicel Chem Ind Ltd | Molding of lens with degree |
| JPS5561439A (en) * | 1978-09-28 | 1980-05-09 | Gen Electric | Metal mold device |
| JPS5729434A (en) * | 1980-07-31 | 1982-02-17 | Toshiba Mach Co Ltd | Method and apparatus for controlling clamping pressure |
| JPS5796833A (en) * | 1980-12-09 | 1982-06-16 | Matsushita Electric Ind Co Ltd | Method of injection-compression molding |
| JPS57169335A (en) * | 1981-04-14 | 1982-10-19 | Mitsui Petrochem Ind Ltd | Injection-compression molding method |
| JPS6021225A (en) * | 1983-07-15 | 1985-02-02 | Idemitsu Petrochem Co Ltd | Injection compression molding method |
| JPS6031929A (en) * | 1983-07-29 | 1985-02-18 | Sumitomo Chem Co Ltd | Compression molding method of thermoplastic resin |
| JPS60242028A (en) * | 1984-04-11 | 1985-12-02 | Mitsubishi Heavy Ind Ltd | Injection compression molding method |
-
1986
- 1986-10-09 JP JP24090686A patent/JPS6394807A/en active Granted
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54148055A (en) * | 1978-05-13 | 1979-11-19 | Daicel Chem Ind Ltd | Molding of lens with degree |
| JPS5561439A (en) * | 1978-09-28 | 1980-05-09 | Gen Electric | Metal mold device |
| JPS5729434A (en) * | 1980-07-31 | 1982-02-17 | Toshiba Mach Co Ltd | Method and apparatus for controlling clamping pressure |
| JPS5796833A (en) * | 1980-12-09 | 1982-06-16 | Matsushita Electric Ind Co Ltd | Method of injection-compression molding |
| JPS57169335A (en) * | 1981-04-14 | 1982-10-19 | Mitsui Petrochem Ind Ltd | Injection-compression molding method |
| JPS6021225A (en) * | 1983-07-15 | 1985-02-02 | Idemitsu Petrochem Co Ltd | Injection compression molding method |
| JPS6031929A (en) * | 1983-07-29 | 1985-02-18 | Sumitomo Chem Co Ltd | Compression molding method of thermoplastic resin |
| JPS60242028A (en) * | 1984-04-11 | 1985-12-02 | Mitsubishi Heavy Ind Ltd | Injection compression molding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6394807A (en) | 1988-04-25 |
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