JPH0546298B2 - - Google Patents
Info
- Publication number
- JPH0546298B2 JPH0546298B2 JP62296370A JP29637087A JPH0546298B2 JP H0546298 B2 JPH0546298 B2 JP H0546298B2 JP 62296370 A JP62296370 A JP 62296370A JP 29637087 A JP29637087 A JP 29637087A JP H0546298 B2 JPH0546298 B2 JP H0546298B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- pressure
- temperature
- quality
- cavity
- 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
Landscapes
- 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＞
本発明は射出成形機の成形品の良否判定に係り
特に形状、寸法の精度の良否判定方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to determining the quality of a molded product of an injection molding machine, and particularly to a method of determining the quality of shape and dimensional accuracy.
＜従来技術＞
従来、射出成形機の成形品の形状の良否を判定
するに際しては、保圧工程における経過時間に対
するキヤビテイ内の樹脂圧力や射出圧力を測定
し、時間の関数Ｐ＝ｆ(t)として求め、良品が得ら
れた時の樹脂圧力等P1＝ｆ(t)とを比較すること
により、または金型温度Ｔ＝ｆ(t)と良品が得られ
た時の金型温度T1＝ｆ(t)を比較することにより、
成形品の品質を判定していた。<Prior art> Conventionally, when determining the quality of the shape of a molded product of an injection molding machine, the resin pressure and injection pressure in the cavity are measured with respect to the elapsed time in the pressure holding process, and the time function P=f(t) is determined. By comparing the resin pressure, etc. P 1 = f(t) when a good product is obtained, or the mold temperature T = f(t) and the mold temperature T 1 when a non-defective product is obtained. By comparing = f(t),
The quality of molded products was judged.
＜発明が解決しようとする問題点＞
キヤビテイ内の樹脂は状態方程式PV＝RT
（Ｐ：圧力、Ｖ：容積、Ｔ：温度、Ｒ：定数）に
よつて変化するものである。従つて、従来のよう
に圧力Ｔ、或いは温度Ｔのみを測定し、品質の判
定を行つていたため、容積Ｖを把握することが不
可能であつた。<Problems to be solved by the invention> The resin in the cavity has an equation of state PV=RT
(P: pressure, V: volume, T: temperature, R: constant). Therefore, as in the past, only the pressure T or temperature T was measured to determine the quality, making it impossible to determine the volume V.
本発明の目的は圧力および温度を把握すること
により、形状を正確に把握し、成形品の形状の良
否判定を行う方法を提供することである。 An object of the present invention is to provide a method for accurately ascertaining the shape of a molded product by determining its pressure and temperature, and determining the quality of the shape of a molded product.
＜問題点を解決するための手段＞
前述の目的を達成するため本発明においては、
良品成形時の温度と圧力を時間の関数として連続
的に検出して基準線とし、他のシヨツトのそれと
比較して成形品の良否を判定する射出成形品の良
品判定方法において、保圧工程開始より経過する
時間ｔに応じて樹脂温度Ｔおよび樹脂圧力Ｐを測
定し、キヤビテイ容積Ｖとしたときのキヤビテイ
容積内の樹脂の状態方程式PV＝RT（Ｒは定数）
に関連してＴとＰの演算処理数であるＴ／Ｐ又は
Ｐ／ＴをＡとしたとき時間の関数Ａ＝ｆ(t)を求
め、良品の得られたシヨツトA0＝ｆ(t)を基準線
とし、その他のシヨツトAo＝ｆ(t)としたことを
特徴とする射出成形品良否判定方法とした。ま
た、前記樹脂温度Ｔおよび樹脂圧力Ｐはそれぞれ
キヤビテイ内の樹脂の温度および圧力としたこと
を特徴とする射出成形品良否判定方法とした。<Means for solving the problems> In order to achieve the above-mentioned object, in the present invention,
In the method for determining the quality of injection molded products, the temperature and pressure during molding of a non-defective product are continuously detected as a function of time and used as a reference line, and compared with those of other shots to determine the quality of the molded product. The resin temperature T and resin pressure P are measured according to the elapsed time t, and when the cavity volume is V, the state equation of the resin in the cavity volume is PV = RT (R is a constant)
When T/P or P/T, which is the number of calculations for T and P, is A, find the time function A=f(t), and find the shot of a good product A 0 = f(t) The method for determining the quality of injection molded products is characterized in that the reference line is A o =f(t) and the other shots are A o =f(t). In addition, the resin temperature T and the resin pressure P are the temperature and pressure of the resin in the cavity, respectively.
＜作用＞
保圧工程における圧力と温度を把握することが
出来、形状の良否の判定が正確に出来るようにな
つた。<Function> It has become possible to grasp the pressure and temperature during the pressure holding process, and it has become possible to accurately judge whether the shape is good or bad.
＜実施例＞
次に第１図および第２図により、本発明の１実
施例を演算処理数Ｔ／Ｐの場合に付いて説明する
と、１０は金型でキヤビテイ１１を形成してい
る。１２はバレルでスクリユ１３が回転自在にか
つ進退自在に挿着されている。従つてホツパ１４
から供給された原料樹脂はバレル１２の外径面に
設けた加熱装置（図示せず）により加熱され、ス
クリユ１３により前方（図中左方向）へ移動する
に従つて、順々に溶解され、スクリユ１３の前方
へ蓄積され、与め設定された計量値に達すると、
スクリユ１３が後退限から前進し、前記キヤビテ
イ１１内に射出される。１５は押出ピンで圧力セ
ンサ１６が取付てあり、キヤビテイ１１内の樹脂
圧力の検出が可能となつている。１７は押出ピン
で先端に温度センサ１８が取付てあり、キヤビテ
イ１１内の樹脂の温度が検出可能となつている。
１９は演算部で前記圧力センサ１６および温度セ
ンサ１８で検出した圧力および温度を時間の関数
として演算を行い、比較部２０により設定部２１
に設定してある良品成形時の値とを比較するよう
になつている。２２は許容値設定器で前記比較部
２０で比較された結果に付加すべき許容値を設定
するものであり、第２図のように良品成形時の基
準線２３に対し、許容値±Δ・Ｔ／Ｐを付加した
例を示すと上限値線図２４および下限値線図２５
のようになり、例えば鎖線で示す実シヨツト線図
２６のように、上・下限値線図２４および２５か
ら逸脱すれば、比較器２７がそれを検知し、アラ
ーム２８を発するようにすることも出来る。<Example> Next, an example of the present invention will be described with reference to FIGS. 1 and 2 in the case of the number of calculations T/P. Reference numeral 10 forms a cavity 11 with a mold. Reference numeral 12 denotes a barrel into which a screw 13 is inserted so as to be rotatable and movable forward and backward. Therefore, Hoppa 14
The raw material resin supplied from the barrel 12 is heated by a heating device (not shown) provided on the outer diameter surface of the barrel 12, and is sequentially melted as it moves forward (to the left in the figure) by the screw 13. It accumulates in front of the screw 13, and when it reaches a preset weight value,
The screw 13 moves forward from the retraction limit and is injected into the cavity 11. 15 is an extrusion pin to which a pressure sensor 16 is attached, making it possible to detect the resin pressure inside the cavity 11. Reference numeral 17 denotes an extrusion pin, and a temperature sensor 18 is attached to the tip thereof, so that the temperature of the resin inside the cavity 11 can be detected.
19 is an arithmetic unit which calculates the pressure and temperature detected by the pressure sensor 16 and the temperature sensor 18 as a function of time, and the comparator 20 calculates the pressure and temperature detected by the pressure sensor 16 and the temperature sensor 18.
The value set for molding a good product is compared with the value set for molding a good product. Reference numeral 22 denotes a tolerance value setter for setting a tolerance value to be added to the results compared by the comparing section 20, and as shown in FIG. An example of adding T/P is shown in upper limit value diagram 24 and lower limit value diagram 25.
For example, if the actual shot diagram 26 shown by the chain line deviates from the upper and lower limit value diagrams 24 and 25, the comparator 27 can detect this and issue an alarm 28. I can do it.
＜発明の効果＞
本発明によりキヤビテイ内に充填された樹脂の
温度および圧力を時間の関数として同時に検知す
ることが出来るので容積、即ち形状の良否が正確
に判定することが出来る。<Effects of the Invention> According to the present invention, the temperature and pressure of the resin filled in the cavity can be simultaneously detected as a function of time, so the volume, that is, the quality of the shape can be accurately determined.
第１図および第２図は本発明による１実施例を
示す図で、第１図はその構成図、第２図は良否判
定例を示す図。
１０……金型、１１……キヤビテイ、１６……
圧力センサ、１８……温度センサ、１９……演算
部、２０……比較部、２１……設定部、２２……
許容値設定器、２３……基準線、２４……上限値
線図、２５……下限値線図、２６……実シヨツト
線図。
FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention, with FIG. 1 being a configuration diagram thereof, and FIG. 2 being a diagram showing an example of quality determination. 10... Mold, 11... Cavity, 16...
Pressure sensor, 18...Temperature sensor, 19...Calculation section, 20...Comparison section, 21...Setting section, 22...
Tolerance value setter, 23... Reference line, 24... Upper limit value diagram, 25... Lower limit value diagram, 26... Actual shot diagram.
Claims (1)
連続的に検出して基準線とし、他のシヨツトのそ
れと比較して成形品の良否を判定する射出成形品
の良品判定方法において、保圧工程開始より経過
する時間ｔに応じて樹脂温度Ｔおよび樹脂圧力Ｐ
を測定し、キヤビテイ容積Ｖとしたときのキヤビ
テイ容積内の樹脂の状態方程式PV＝RT（Ｒは定
数）に関連してＴとＰの演算処理数であるＴ／Ｐ
又はＰ／ＴをＡとしたとき時間の関数Ａ＝ｆ(t)を
求め、良品の得られたシヨツトA0＝ｆ(t)を基準
線とし、その他のシヨツトAo＝ｆ(t)としたこと
を特徴とする射出成形品良否判定方法。 ２ 前記樹脂温度Ｔおよび樹脂圧力Ｐはそれぞれ
キヤビテイ内の樹脂の温度および圧力としたこと
を特徴とする前記特許請求の範囲第１項記載の射
出成形品良否判定方法。[Scope of Claims] 1. Good product determination for injection molded products, in which the temperature and pressure during molding of non-defective products are continuously detected as a function of time, used as a reference line, and compared with those of other shots to determine the quality of the molded product. In the method, the resin temperature T and the resin pressure P are adjusted according to the time t elapsed from the start of the pressure holding step.
T/P is the number of calculations for T and P in relation to the equation of state of the resin in the cavity volume PV=RT (R is a constant) when the cavity volume is measured and the cavity volume is V.
Alternatively, when P/T is A, find the time function A = f(t), use the shot A 0 = f(t) where a good product was obtained as the reference line, and calculate the other shots A o = f(t). A method for determining the quality of injection molded products. 2. The method for determining the quality of an injection molded product according to claim 1, wherein the resin temperature T and the resin pressure P are the temperature and pressure of the resin in the cavity, respectively.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29637087A JPH01136716A (en) | 1987-11-25 | 1987-11-25 | Determination of quality of injection-molded object |
| EP88119555A EP0317992B1 (en) | 1987-11-25 | 1988-11-24 | Method of judging quality of injection molded products |
| DE8888119555T DE3880095T2 (en) | 1987-11-25 | 1988-11-24 | METHOD FOR QUALITY ASSESSMENT OF AN INJECTION MOLDED PRODUCT. |
| ES198888119555T ES2041770T3 (en) | 1987-11-25 | 1988-11-24 | PROCEDURE FOR EVALUATION OF THE QUALITY OF PRODUCTS MOLDED BY INJECTION. |
| KR1019880015506A KR910002650B1 (en) | 1987-11-25 | 1988-11-24 | Defective determination method of injection molding |
| US07/595,701 US5017315A (en) | 1987-11-25 | 1990-10-10 | Method and apparatus of judging quality of injection molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29637087A JPH01136716A (en) | 1987-11-25 | 1987-11-25 | Determination of quality of injection-molded object |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01136716A JPH01136716A (en) | 1989-05-30 |
| JPH0546298B2 true JPH0546298B2 (en) | 1993-07-13 |
Family
ID=17832673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29637087A Granted JPH01136716A (en) | 1987-11-25 | 1987-11-25 | Determination of quality of injection-molded object |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01136716A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2807924B2 (en) * | 1990-11-30 | 1998-10-08 | 住友重機械工業株式会社 | Control device for injection molding machine |
| JPH0825219B2 (en) * | 1991-12-28 | 1996-03-13 | 日精樹脂工業株式会社 | Molding machine controller |
| WO1997043554A1 (en) | 1996-05-13 | 1997-11-20 | Thk Co., Ltd. | Linear roller guide |
| CN101392619B (en) | 2007-09-18 | 2011-07-27 | 梁敏 | Anti-theft safe |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59232835A (en) * | 1983-06-15 | 1984-12-27 | Hitachi Ltd | Injection compression mold and its molding method |
| JPS61229521A (en) * | 1985-04-04 | 1986-10-13 | Toshiba Mach Co Ltd | Monitoring of injection process |
-
1987
- 1987-11-25 JP JP29637087A patent/JPH01136716A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01136716A (en) | 1989-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |