JPH01234221A - Improvement in accuracy of mold open amount - Google Patents
Improvement in accuracy of mold open amountInfo
- Publication number
- JPH01234221A JPH01234221A JP6128088A JP6128088A JPH01234221A JP H01234221 A JPH01234221 A JP H01234221A JP 6128088 A JP6128088 A JP 6128088A JP 6128088 A JP6128088 A JP 6128088A JP H01234221 A JPH01234221 A JP H01234221A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- space
- main ram
- hydraulic oil
- valve
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000000748 compression moulding Methods 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 abstract description 11
- 239000010720 hydraulic oil Substances 0.000 abstract 5
- 238000007796 conventional method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は射出成形機に利用できる型開量精度向上方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for improving mold opening accuracy that can be used in an injection molding machine.
（従来の技術）
従来の射出圧縮成形における圧縮量コントロール方法を
、第２図の直圧式型締装置を使って説明する。第２図に
おいて図示しない射出ユニット中で可塑化された樹脂は
、金型４内に同ユニットによって注入されるが、通常成
形ではこの注入圧に打勝つだけの型締力で金型４を合わ
せた状態に保っておく。(Prior Art) A compression amount control method in conventional injection compression molding will be explained using a direct pressure mold clamping device shown in FIG. In FIG. 2, the resin plasticized in an injection unit (not shown) is injected into the mold 4 by the same unit, but in normal molding, the mold 4 is held together with enough mold clamping force to overcome this injection pressure. Keep it in good condition.
しかしながら肉厚のｉＩ Ｌ−’成形品の場合には、金
型内を流れる際樹脂が壁面に薄い層となって固化するた
め、流路が極端に狭くなり、流動抵抗が非常に大きくな
る。このため樹脂の分子は流れの方向に配向され、この
状態で固化することにより、内部応力を生ずる原因とな
り、成形品の歪を引き起こす。However, in the case of a thick-walled iI L-' molded product, the resin solidifies as a thin layer on the wall surface when flowing through the mold, so the flow path becomes extremely narrow and the flow resistance becomes extremely large. Therefore, the resin molecules are oriented in the direction of flow, and solidification in this state causes internal stress to occur, causing distortion in the molded product.
これを防止するために、樹脂の金型内への注入にあたり
、金型を僅かに開いた状態に保ち、肉厚を大きくした状
態で樹脂を注入し、注入完了でもって金型を合わせ、所
定の形の成形品を得る方法が、従来射出圧縮成形法とし
て知られている。しかしこの方法では、金型を所定量に
精度よく開けた状態にしておくことが要求されるが、こ
の精度を得ることが難しかった。In order to prevent this, when injecting the resin into the mold, keep the mold slightly open and inject the resin while increasing the wall thickness, and when the injection is complete, align the mold and place it in the specified position. A method of obtaining a molded article in the form of is conventionally known as injection compression molding. However, this method requires that the mold be opened to a predetermined amount with high precision, but it has been difficult to achieve this precision.
第４図に従来方法の動作図を示すが、型閉速度を高速か
ら低速に落とし、型合わせの手前の所定の位置で、型閉
停止信号を葺い、型を停止するのが従来の方法である。Figure 4 shows the operation diagram of the conventional method.The conventional method is to reduce the mold closing speed from high to low, and to stop the mold by placing a mold closing stop signal at a predetermined position before mold alignment. be.
（発明が解決しようとする課題）
しかしながら前記従来の方法では、第３図に示す様に、
型の停止位置が精度よく決まらないという欠点がある。(Problem to be solved by the invention) However, in the conventional method, as shown in FIG.
The drawback is that the stopping position of the mold cannot be determined with high precision.
即ち、型開の速度が高速から低速へと切換わる位置は、
点ａとｂとの範囲で、信号系統内、油圧回路内での動作
のバラツキにより、毎回変動するし、減速の度合いも油
温の影Ｃを受けて傾斜Ｃからｄの範囲で経時変化するの
で、完全に低速状態となる位置は、点ｅからｆの範囲で
変動する。In other words, the position where the mold opening speed switches from high speed to low speed is
In the range between points a and b, it changes every time due to variations in the operation within the signal system and hydraulic circuit, and the degree of deceleration also changes over time in the range from slope C to d due to the influence of oil temperature C. Therefore, the position where the speed becomes completely low varies within the range from point e to f.
このため型の停止信号を発するポイントｊを、ｅからｆ
の間におく時は、停止位置は停止信号を受けた時の速度
、例えばｇからｈの値により変化してしまう。この変化
は圧縮代に求められる０、ｉｎ−台の精度を大きく越え
るものとなるので、実用的でなく、従って停止信号を発
するポイントｊは、ｈより右側（型合わせポイントｋに
近い処）にもって来る必要がある。Therefore, the point j that emits the stop signal of the mold is changed from e to f.
If the stop position is between the two, the stop position will change depending on the speed at which the stop signal is received, for example, the value of g to h. This change greatly exceeds the accuracy of 0, in- order required for the compression allowance, so it is not practical. Therefore, the point j that issues the stop signal should be placed to the right of h (close to the mold matching point k). I need to bring it.
一方通常の型閉動作であれば、型合わせポイントには、
ｅより右側であれば、どこでもよい（金型にあてて止め
るため）ので、先の圧縮成形の場合にくらべ、最大でｆ
−ｅのストローク分だけ低速区間を短くすることが出来
る。このことから従来の型停止方法は、型開に要する時
間を長くせずには、停止精度を上げられないという欠点
をもっている。またこの様な生産性の低下につながる欠
点の他に、もともと停止精度が悪いという本質的な問題
もかかえている。On the other hand, in the case of normal mold closing operation, the mold matching points include:
It can be anywhere to the right of e (to stop it against the mold), so compared to the previous compression molding, the maximum f
The low speed section can be shortened by the stroke of -e. For this reason, the conventional mold stopping method has the disadvantage that stopping accuracy cannot be improved without increasing the time required to open the mold. In addition to the drawbacks that lead to a decrease in productivity, there is also the essential problem of poor stopping accuracy.
この理由について以下に説明すると、第２図において、
主ラム５、可動型盤２は大きな質量を持っており、例え
ｌ ｚ／ｍｉｎ程度の速度で動いている場合でも、これ
を精度よく停止させるには、大きな力が要る。The reason for this will be explained below. In Figure 2,
The main ram 5 and the movable mold platen 2 have a large mass, and even if they are moving at a speed of about lz/min, a large force is required to stop them accurately.
従来の方法では、空間Ｃ及びＡの油を方向切換弁１０で
閉鎖することにより、主ラム５及び可動型盤２の動きを
止めようとするので、油の圧縮性、方向切換弁１０の応
答バラツキにより停止精度が得られない。これを防ぐた
めに、型閉低速切換時、或いは型閉低連中にプレフィル
弁７を閉じる方法も考えられるが、必要な低速速度を得
るには、多量の油の供給が必要となり、油圧ポンプの容
量の上昇によるコストアップとなる上、空間Ｂ内の圧力
を極めて低圧（〜１ ｋｇｆ／ａｄ ）に制御しないと
、金型保護の機能を果たさないという技術的な困難さも
あって採用が難しかった。In the conventional method, the movement of the main ram 5 and the movable mold platen 2 is attempted to be stopped by closing the oil in spaces C and A with the directional control valve 10, so the compressibility of the oil and the response of the directional control valve 10 are Stopping accuracy cannot be achieved due to variations. In order to prevent this, a method of closing the prefill valve 7 when switching to low mold closing speed or during mold closing low speed may be considered, but in order to obtain the necessary low speed, a large amount of oil needs to be supplied, and the capacity of the hydraulic pump is reduced. In addition to the cost increase due to the increase in the pressure, it was difficult to adopt this method due to the technical difficulty that it would not function to protect the mold unless the pressure in the space B was controlled to an extremely low pressure (~1 kgf/ad).
本発明は前記従来の課題を解決するために提案されたも
のである。The present invention has been proposed to solve the above-mentioned conventional problems.
（課題を解決するための手段及び作用）このため本発明
は、射出圧縮成形を行う直圧式型締装置において、射出
開始前に一旦通常の動作で型閉を行い、型合わせをした
後プレフィル弁を閉じ、同弁の開の状態よりも大きな流
路抵抗を有するタンクラインを主シリンダに接続せしめ
る様にしつつ、圧縮量分のみ型を低速で開くようにして
なるもので、これを課題解決のための手段及び作用とす
るものである。(Means and effects for solving the problem) For this reason, the present invention provides a direct pressure type mold clamping device for injection compression molding, in which the mold is once closed in a normal operation before the start of injection, and after mold alignment, the prefill valve is closed. The system closes the valve and connects the tank line, which has a flow resistance greater than when the valve is open, to the main cylinder, while opening the mold at a low speed only by the amount of compression. It shall be the means and action for that purpose.
（実施例）
以下本発明を図面の実施例について説明すると、第１図
は本発明における射出圧縮成形法の動作図を示す。第１
図では型開停止位置精度の向上を図るために、型合わせ
をした状態で、第２図に示す方向切換弁１１を励磁させ
、プレフィル弁７を閉じる。この状態でＳＱＬ“ＯＰ”
を励磁して型開きを行う。これにより空間へに圧油が送
られ、主ラム５を後退させると、空間Ｂの油は、空間Ｃ
を経てタンク１２に排出される。(Example) The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 shows an operational diagram of the injection compression molding method in the present invention. 1st
In the figure, in order to improve the precision of the mold opening and stopping position, with the molds aligned, the directional switching valve 11 shown in FIG. 2 is energized and the prefill valve 7 is closed. In this state, SQL “OP”
is excited to open the mold. As a result, pressure oil is sent to the space, and when the main ram 5 is retreated, the oil in the space B is transferred to the space C.
The water is discharged into the tank 12 through the process.
空間Ｃの流路抵抗は、空間りのそれよりも道かに大きい
のが、直圧式型締装置の構造的特徴である。このため型
開動作に伴う空間Ｂにある大容積の油は、その空間Ｃを
通る通路が小さいため、主ラム５の動きにとって大きな
ブレーキ役を果たすことになり、空間へへの油の供給が
停止すると、直ちに主ラム５の動きも停止する等の効果
が得られる。A structural feature of the direct pressure type mold clamping device is that the flow path resistance in the space C is significantly larger than that in the space. For this reason, the large volume of oil in space B accompanying the mold opening operation has a small passage through space C, so it plays a large braking role for the movement of the main ram 5, and the supply of oil to the space is limited. When the main ram 5 stops, the movement of the main ram 5 is also immediately stopped.
この方法をとる場合、型を開くために空間Ａに必要な油
圧は、従来方法に比較して格段（７０〜１００ｋｇｆ／
ｃｏｔ）に高く、このため方向切換弁１０が閉鎖して油
の供給が停止すると、この圧力は直ちに低下し、型を開
く力は急速に失われるし、逆に空間Ｂに発生する背圧は
、僅かなものである。しかも主ラム５が動いている間の
み発生する圧力であるため、型開速度が低下すれば、こ
の力も下がるので、主ラム５が停止する時にも、これを
妨げる力にはなり得ない。以上の理由により、高い停止
位置精度が得られる。When using this method, the hydraulic pressure required in space A to open the mold is significantly (70 to 100 kgf/
cot), and therefore, when the directional control valve 10 is closed and the oil supply is stopped, this pressure immediately decreases and the force to open the mold is rapidly lost, and conversely, the back pressure generated in the space B is , is small. Moreover, since this pressure is generated only while the main ram 5 is moving, this force also decreases as the mold opening speed decreases, so that it cannot become a force that prevents the main ram 5 from stopping. For the above reasons, high stopping position accuracy can be obtained.
（発明の効果）
以上詳細に説明した如く本発明、は構成されているので
、直圧式型締装置がもともと備えているプレフィル弁を
主ラムのブレーキ弁として使うことにより、コスト負担
を増加させることなく、高い停止位置精度を得ることが
できる。(Effects of the Invention) Since the present invention is constructed as described in detail above, the cost burden is increased by using the prefill valve originally provided in the direct pressure type mold clamping device as the brake valve of the main ram. Therefore, high stopping position accuracy can be obtained.
第１図は本発明の方法を実施する型締動作説明図、第２
図は一般的な直圧式型締装置の側断面図、第３図は従来
方法による型停止位置精度のバラツキの説明図、第４図
は従来の型締動作の説明図である。
図の主要部分の説明
２−可動型盤
３−・−固定型盤
４−金型
５〜・主ラム
６−・ブースタラム
７・−・プレフィル弁
８−主シリンダ
９−プレフィル弁開閉シリンダ
１０、１１・・・方向切換弁
第１圓
耐巴氏鐸威形汰釣作圓
第２図
Ｉに万間切言奏升
ｆｆ１３図
射出圧扁床形シと動作ｇFig. 1 is an explanatory diagram of the mold clamping operation for carrying out the method of the present invention;
FIG. 3 is a side sectional view of a general direct pressure type mold clamping device, FIG. 3 is an explanatory diagram of variations in mold stop position accuracy according to a conventional method, and FIG. 4 is an explanatory diagram of a conventional mold clamping operation. Explanation of the main parts of the figure 2 - Movable mold platen 3 - Fixed mold platen 4 - Mold 5 - Main ram 6 - Booster ram 7 - Prefill valve 8 - Main cylinder 9 - Prefill valve opening/closing cylinders 10, 11 ... Directional switching valve No. 1 Entai Tomoe Ushi Takui Kata Tsuri Sakuen Fig. 2 Manken Kigen Sosho ff Fig. 13 Injection pressure flat bed type and operation g
Claims (1)
前に一旦通常の動作で型閉を行い、型合わせをした後プ
レフィル弁を閉じ、同弁の開の状態よりも大きな流路抵
抗を有するタンクラインを主シリンダに接続せしめる様
にしつつ、圧縮量分のみ型を低速で開くようにしたこと
を特徴とする型開量精度向上方法。In a direct pressure mold clamping device that performs injection compression molding, the mold is closed in a normal manner before injection starts, and after mold alignment, the prefill valve is closed and the flow path resistance is greater than when the valve is open. A method for improving mold opening accuracy, which is characterized in that the tank line is connected to the main cylinder, and the mold is opened at a low speed only by the amount of compression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6128088A JPH01234221A (en) | 1988-03-15 | 1988-03-15 | Improvement in accuracy of mold open amount |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6128088A JPH01234221A (en) | 1988-03-15 | 1988-03-15 | Improvement in accuracy of mold open amount |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01234221A true JPH01234221A (en) | 1989-09-19 |
Family
ID=13166636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6128088A Pending JPH01234221A (en) | 1988-03-15 | 1988-03-15 | Improvement in accuracy of mold open amount |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01234221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07290538A (en) * | 1994-04-20 | 1995-11-07 | Nissei Plastics Ind Co | Molds clamping method for injection compression molding machine |
-
1988
- 1988-03-15 JP JP6128088A patent/JPH01234221A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07290538A (en) * | 1994-04-20 | 1995-11-07 | Nissei Plastics Ind Co | Molds clamping method for injection compression molding machine |
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