JPH0696258B2 - Injection pressure measuring device - Google Patents
Injection pressure measuring deviceInfo
- Publication number
- JPH0696258B2 JPH0696258B2 JP8854488A JP8854488A JPH0696258B2 JP H0696258 B2 JPH0696258 B2 JP H0696258B2 JP 8854488 A JP8854488 A JP 8854488A JP 8854488 A JP8854488 A JP 8854488A JP H0696258 B2 JPH0696258 B2 JP H0696258B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- injection
- pressure sensor
- measuring device
- 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 - Fee Related
Links
- 238000002347 injection Methods 0.000 title claims description 46
- 239000007924 injection Substances 0.000 title claims description 46
- 230000005540 biological transmission Effects 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (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） 本発明は射出圧力測定装置に関し、更に詳しくは、合成
樹脂の成形に用いる射出成形機に好適な射出圧力測定装
置に関する。TECHNICAL FIELD The present invention relates to an injection pressure measuring device, and more particularly to an injection pressure measuring device suitable for an injection molding machine used for molding a synthetic resin.
（従来技術） 一般に、合成樹脂の成形に用いられる射出成形機には、
射出圧力のフィードバック制御、或いは運転状況の監
視、モニターのため、射出圧力測定装置が設けられてい
る。(Prior Art) Generally, an injection molding machine used for molding a synthetic resin has
An injection pressure measuring device is provided for feedback control of the injection pressure or for monitoring and monitoring the operating condition.
ところで、従来の射出圧力測定方法としては、射出プラ
ンジャを前進させる射出シリンダの加圧側油室に圧力セ
ンサーを配設する方法、金型内の樹脂と接する部位に圧
力センサーを配設する方法、射出筒の樹脂と接する部位
に圧力センサーを配設する方法等が採用されている。By the way, as a conventional injection pressure measuring method, a method of disposing a pressure sensor in a pressure side oil chamber of an injection cylinder for advancing an injection plunger, a method of disposing a pressure sensor in a portion in contact with resin in a mold, and an injection method A method of arranging a pressure sensor at a portion of the cylinder that contacts the resin is adopted.
（発明が解決しようとする課題） 上記圧力測定方法のうち、射出シリンダに圧力センサー
を配設する方法は、実際の射出圧力に、機構部の摩擦力
が加算されてしまうために正確な射出圧力を測定できな
い問題があり、金型内に圧力センサーを配設する方法で
は、金型毎に圧力センサーの取り付けを考慮した構造と
しなければならない煩わしさと、更に実際の射出圧力よ
りも樹脂路内の流動抵抗による圧損分が減算されてしま
うために正確な圧力測定ができないという問題がある。(Problem to be Solved by the Invention) Among the above pressure measuring methods, the method of arranging the pressure sensor in the injection cylinder is accurate in the injection pressure because the frictional force of the mechanism is added to the actual injection pressure. There is a problem that it is not possible to measure, and in the method of arranging the pressure sensor in the mold, it is necessary to have a structure that considers the mounting of the pressure sensor for each mold, and further, the injection pressure inside the resin path is more than the actual injection pressure. There is a problem that accurate pressure measurement cannot be performed because the pressure loss due to flow resistance is subtracted.
この様に、上記両方法では、射出筒内の圧力を直接的に
測定できないために測定精度に問題がある。As described above, in both of the above methods, the pressure in the injection cylinder cannot be directly measured, which causes a problem in measurement accuracy.
この点、射出筒に圧力センサーを配置する方法では、直
接的に射出圧力を測定できるため、測定精度的には優れ
ている。In this respect, the method of arranging the pressure sensor in the injection cylinder is excellent in measurement accuracy because the injection pressure can be directly measured.
唯、射出筒内では、樹脂材料を溶融状態に保つために常
時200〜400℃程度の高温に保たれており、しかも圧力も
2000〜3000kg/cm2程度と高圧となるため、使用できる圧
力センサーも非常に高価で大型なものに限定され、更に
センサーは高温、高圧の樹脂に常時接触しているため、
腐蝕、摩耗等によって披損され易く、且つ温度ドリフト
により検出特性が変化して正確な圧力が検出し難い問題
がある。However, in the injection cylinder, in order to keep the resin material in a molten state, it is always kept at a high temperature of 200 to 400 ° C, and the pressure is also kept.
Since it is a high pressure of about 2000 to 3000 kg / cm 2 , the pressure sensor that can be used is also very expensive and limited to a large size, and since the sensor is in constant contact with high temperature and high pressure resin,
There is a problem that it is easily damaged due to corrosion, wear, etc., and the detection characteristics change due to temperature drift, making it difficult to detect accurate pressure.
本発明者は、かかる問題を解決するためには、圧力セン
サーに何等かの圧力伝達手段を介して伝達することが有
効ではないかと考えて検討した結果、本発明に到達し
た。In order to solve such a problem, the present inventor has arrived at the present invention as a result of a study, considering that it is effective to transmit the pressure to a pressure sensor via some kind of pressure transmitting means.
即ち、前記課題の解決は、圧力センサーに圧力伝達ピン
を介して樹脂圧力を伝達させるようにし、圧力センサー
を高温、高圧から保護することができる射出圧力測定装
置によって達成できる。That is, the solution of the above problem can be achieved by an injection pressure measuring device that can transmit the resin pressure to the pressure sensor via the pressure transmission pin and protect the pressure sensor from high temperature and high pressure.
（課題を解決するための手段） 上記課題を解決し得る本発明の射出圧力測定装置は、射
出プランジャ前方の射出筒壁面を貫通する孔部に設けら
れているケース内に棒状の圧力伝達ピンが摺動自在に挿
入され、その一端が圧力センサーの感圧部に、他端が射
出筒内の樹脂に夫々接することを特徴とする。(Means for Solving the Problems) In the injection pressure measuring device of the present invention which can solve the above problems, a rod-shaped pressure transmission pin is provided in a case provided in a hole penetrating the wall surface of the injection cylinder in front of the injection plunger. It is slidably inserted, one end of which is in contact with the pressure-sensitive portion of the pressure sensor and the other end is in contact with the resin inside the injection cylinder.
また、圧力センサーを射出筒外壁面から離して設け、更
に圧力センサーを空気流で冷却することによって、圧力
センサーを射出筒壁面からの熱から保護するようにする
と更に好適である。Further, it is more preferable that the pressure sensor is provided away from the outer wall surface of the injection cylinder, and the pressure sensor is cooled by an air flow to protect the pressure sensor from heat from the wall surface of the injection cylinder.
（作用） 本発明によれば、圧力センサーには圧力伝達ピンを介し
て圧力が伝達されるので圧力センサーは高温、高圧に晒
されることがなく、特殊な高温仕様のものを使用するこ
となく一般的な小型で安価なものを使用でき、温度ドリ
フトもなく高精度な測定を行うことができる。(Operation) According to the present invention, since the pressure is transmitted to the pressure sensor via the pressure transmission pin, the pressure sensor is not exposed to high temperature and high pressure, and is generally used without using a special high temperature specification. A compact and inexpensive one can be used, and highly accurate measurement can be performed without temperature drift.
また、構造が簡単で伝達ピンの交換、清浄も容易であ
る。In addition, the structure is simple and the transmission pins can be easily replaced and cleaned.
（実施例） 本発明を図面を用いて説明する。(Example) This invention is demonstrated using drawing.
第１図は、本発明の射出圧力装置が設けられているイン
ラインスクリュ式射出装置の射出筒部の縦断面図、第２
図は第１図Ａ−Ａ′面における横断面図、第３図は第１
図に示す射出筒部の平面図を夫々示す。FIG. 1 is a longitudinal sectional view of an injection cylinder portion of an in-line screw type injection device provided with the injection pressure device of the present invention, and FIG.
The figure is a cross-sectional view taken along the plane AA 'in FIG. 1, and FIG.
The top view of the injection cylinder part shown in each figure is shown, respectively.
第１図に示すインラインスクリュ式射出装置では、一般
的に、可塑化スクリュが射出プランジャを兼ね、射出筒
はスクリュ２を内装した円筒状の加熱筒１と、加熱筒１
の先端に配設された加熱筒ヘッド14及び金型に当接して
金型と加熱筒１とを接続するノズル９より構成されてい
る。In the in-line screw type injection apparatus shown in FIG. 1, generally, the plasticizing screw also serves as an injection plunger, and the injection cylinder has a cylindrical heating cylinder 1 in which the screw 2 is installed, and the heating cylinder 1.
It is composed of a heating cylinder head 14 arranged at the tip of and a nozzle 9 which contacts the mold and connects the mold and the heating cylinder 1.
本発明においては、かかる射出筒内の圧力が棒状の圧力
伝達ピン４を介して圧力センサー６に伝達されることが
肝要である。In the present invention, it is essential that the pressure in the injection cylinder is transmitted to the pressure sensor 6 via the rod-shaped pressure transmission pin 4.
かかる圧力伝達ピン４は、加熱筒１の壁面を貫通する孔
部３に設けられているケース５内に摺動自在に挿入さ
れ、その一端が圧力センサー６の感圧部に、他端が加熱
筒内の樹脂に夫々接することが大切である。The pressure transmission pin 4 is slidably inserted into a case 5 provided in a hole 3 penetrating the wall surface of the heating cylinder 1, one end of which is a pressure-sensitive portion of the pressure sensor 6 and the other end of which is heated. It is important to contact each resin in the cylinder.
この様な圧力伝達ピン４の形状は、ケース５との摩擦抵
抗を可及的に少なくし且つ樹脂の流入を防止するため、
第１図に示す如く、段付とすることが好ましく、特にケ
ース５との摺合部を高々２ケ所程度とすることが好まし
い。Such a shape of the pressure transmission pin 4 reduces frictional resistance with the case 5 as much as possible and prevents inflow of resin.
As shown in FIG. 1, it is preferable to form a step, and it is particularly preferable to make the sliding portions with the case 5 at about two places at most.
また、圧力伝達ピン４の断面形状は任意のものでよく、
通常、丸断面のものが用いられる。Moreover, the cross-sectional shape of the pressure transmission pin 4 may be arbitrary,
Usually, a circular cross section is used.
かかる圧力伝達ピン４は、ケース５内に摺動自在に且つ
加熱筒１の内壁面から突出せぬ様に挿入される。The pressure transmission pin 4 is slidably inserted into the case 5 so as not to project from the inner wall surface of the heating cylinder 1.
尚、この様な圧力伝達ピン４による加熱筒圧力の伝達
は、実際の圧力よりも圧力伝達ピン４とケース５との摩
擦力が減算されるが、本発明で採用する圧力伝達ピン４
は小型軽量とすることができるため、工業上実質的に問
題とはならない。In the transmission of the heating cylinder pressure by the pressure transmission pin 4 as described above, the frictional force between the pressure transmission pin 4 and the case 5 is subtracted from the actual pressure, but the pressure transmission pin 4 adopted in the present invention is used.
Since it can be made small and lightweight, it does not pose a practical industrial problem.
この様な圧力伝達ピン４が挿入されるケース５は、加熱
筒１の壁面を貫通する孔部３に螺合されており、その加
熱筒１の内壁面近傍においては、第１図に示す如く、段
付とすることが好ましい。The case 5 into which such a pressure transmission pin 4 is inserted is screwed into the hole 3 penetrating the wall surface of the heating cylinder 1, and in the vicinity of the inner wall surface of the heating cylinder 1, as shown in FIG. Preferably, it is stepped.
かかる圧力伝達ピン４を介して伝達される加熱筒内の圧
力は、圧力伝達ピン４の上端部15から圧力センサー６の
感圧部に伝達されて電気信号等に変換され、ハーネス線
11（第２図に示す）等を通して搬送される。The pressure in the heating cylinder transmitted through the pressure transmission pin 4 is transmitted from the upper end portion 15 of the pressure transmission pin 4 to the pressure sensitive portion of the pressure sensor 6 and converted into an electric signal or the like, and the harness wire
11 (shown in FIG. 2) and the like.
このため、前記上端部15は圧力センサー６の感圧部と接
触する様に位置決めされていることを要する。Therefore, the upper end portion 15 needs to be positioned so as to come into contact with the pressure sensitive portion of the pressure sensor 6.
圧力センサー６としては、従来から公知のものを使用す
ることができ、ストレーンゲージ式のものが好ましい。As the pressure sensor 6, a conventionally known one can be used, and a strain gauge type is preferable.
かかる圧力センサー６は、加熱筒１内に設けられていて
もよいが、第１図に示す如く加熱筒１の外壁面から離れ
た位置に設けられていることが、加熱筒１の熱から圧力
センサー６を保護するために好ましい。The pressure sensor 6 may be provided in the heating cylinder 1, but it is necessary to provide the pressure sensor 6 at a position away from the outer wall surface of the heating cylinder 1 as shown in FIG. It is preferable for protecting the sensor 6.
更に、この場合には、センサーケース７とセンサーケー
ス押え板８とをボルト止めすることによって、圧力セン
サー６の加熱筒１に対する方向を自由に変更することが
できるため好ましい。Further, in this case, the direction of the pressure sensor 6 with respect to the heating cylinder 1 can be freely changed by bolting the sensor case 7 and the sensor case pressing plate 8 to each other, which is preferable.
かかるセンサーケース７に圧力センサー６を、第２図に
示す如く、板ばね10によって固定すると、圧力センサー
６を抜き差し自在とすることができ、圧力センサー６の
零点調整、ゲイン調整等を外部で行うことができるため
に好ましい。When the pressure sensor 6 is fixed to the sensor case 7 by a leaf spring 10 as shown in FIG. 2, the pressure sensor 6 can be freely inserted and removed, and zero adjustment and gain adjustment of the pressure sensor 6 are performed externally. It is preferable because it can be.
また、圧力センサー６の温度上昇を防止し温度ドリフト
の発生を防止するため、第３図に示す如く、センサーケ
ース７の壁面に通孔13を開孔してエアー配管12から空気
流を圧力センサー６に吹きつけることが好ましい。Further, in order to prevent the temperature rise of the pressure sensor 6 and the occurrence of temperature drift, as shown in FIG. It is preferable to spray on No. 6.
尚、以上の説明は、圧力測定装置を加熱筒１に設ける場
合について主として行なってきたが、本発明の装置は加
熱ヘッド14或いはノズル９にも設けてもよく、射出成形
機もインラインスクリュ式に限らず、プランジャ式、プ
リプラ式等にも同様に設けることができる。Although the above description has been made mainly for the case where the pressure measuring device is provided in the heating cylinder 1, the device of the present invention may be provided in the heating head 14 or the nozzle 9, and the injection molding machine may be an in-line screw type. The invention is not limited to the plunger type, the pre-plastic type, and the like, and can be similarly provided.
（発明の効果） 本発明の射出圧力測定装置によれば、圧力センサーを高
温、高圧から保護しつつ樹脂圧力を実質的に直接測定で
きるため、温度ドリフト等の弊害を防止でき測定精度を
向上することができる。(Effect of the Invention) According to the injection pressure measuring device of the present invention, since the resin pressure can be substantially directly measured while protecting the pressure sensor from high temperature and high pressure, adverse effects such as temperature drift can be prevented and measurement accuracy can be improved. be able to.
また、本発明の射出圧力測定装置によれば、加熱部分か
らの放熱、伝熱等による圧力センサーの加熱を防止する
ことができ、測定精度を一層向上することができる。Further, according to the injection pressure measuring device of the present invention, it is possible to prevent the pressure sensor from being heated due to heat radiation from the heating portion, heat transfer, etc., and it is possible to further improve the measurement accuracy.
第１図は本発明の射出圧力装置が設けられているインラ
インスクリュ式射出装置の射出筒部の縦断面図、第２図
は第１図のＡ−Ａ′面における横断面図、第３図は第１
図に示す射出筒部の平面図を夫々に示す。 図において、 ３……孔部、４……圧力伝達ピン、５……ケース、６…
…圧力センサー1 is a longitudinal sectional view of an injection cylinder portion of an in-line screw type injection device provided with an injection pressure device of the present invention, FIG. 2 is a transverse sectional view taken along the line AA ′ of FIG. 1, and FIG. Is the first
The top view of the injection cylinder part shown in each figure is shown, respectively. In the figure, 3 ... hole, 4 ... pressure transmission pin, 5 ... case, 6 ...
…pressure sensor
Claims (3)
る孔部に設けられているケース内に棒状の圧力伝達ピン
が摺動自在に挿入され、その一端が圧力センサーの感圧
部に、他端が射出筒内樹脂に夫々接することを特徴とす
る射出圧力測定装置。1. A rod-shaped pressure transmission pin is slidably inserted in a case provided in a hole penetrating a wall surface of an injection cylinder in front of an injection plunger, one end of which is used as a pressure-sensitive portion of a pressure sensor, and the other of which is An injection pressure measuring device, characterized in that the ends contact the resin in the injection cylinder.
けられている請求項第１項記載の射出圧力測定装置。2. The injection pressure measuring device according to claim 1, wherein the pressure sensor is provided separately from the outer wall surface of the injection cylinder.
第１項又は第２項記載の射出圧力測定装置。3. The injection pressure measuring device according to claim 1, wherein the pressure sensor is cooled by an air flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8854488A JPH0696258B2 (en) | 1988-04-11 | 1988-04-11 | Injection pressure measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8854488A JPH0696258B2 (en) | 1988-04-11 | 1988-04-11 | Injection pressure measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01259919A JPH01259919A (en) | 1989-10-17 |
| JPH0696258B2 true JPH0696258B2 (en) | 1994-11-30 |
Family
ID=13945793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8854488A Expired - Fee Related JPH0696258B2 (en) | 1988-04-11 | 1988-04-11 | Injection pressure measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0696258B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7524647B2 (en) * | 2020-07-21 | 2024-07-30 | セイコーエプソン株式会社 | Material delivery device, three-dimensional modeling device, and injection molding device |
-
1988
- 1988-04-11 JP JP8854488A patent/JPH0696258B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01259919A (en) | 1989-10-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |