JPH0426723B2 - - Google Patents
Info
- Publication number
- JPH0426723B2 JPH0426723B2 JP1169886A JP1169886A JPH0426723B2 JP H0426723 B2 JPH0426723 B2 JP H0426723B2 JP 1169886 A JP1169886 A JP 1169886A JP 1169886 A JP1169886 A JP 1169886A JP H0426723 B2 JPH0426723 B2 JP H0426723B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control valve
- proportional control
- holding furnace
- computer
- 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
Links
- 239000002184 metal Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 238000005429 filling process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Control Of Fluid Pressure (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、比例制御弁の計算機による自動制御
方法に係り、より詳しくは、低圧鋳造機の溶湯保
持炉内を所定の時間−圧力曲線（以下、目標パタ
ーンという）に従つて加圧制御するに当り、保持
炉に圧縮気体を供給する回路に配設した比例制御
弁を計算機により自動的に制御するのに好適な方
法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for automatically controlling a proportional control valve using a computer, and more specifically, the present invention relates to a method for automatically controlling a proportional control valve using a computer, and more particularly, the present invention relates to a method for automatically controlling a proportional control valve using a computer. The present invention relates to a method suitable for automatically controlling, by computer, a proportional control valve disposed in a circuit for supplying compressed gas to a holding furnace in pressurizing control according to a target pattern (hereinafter referred to as a target pattern).
（従来の技術）
本出願人は、先に、特願昭60−95726号（特開
昭61−253158号）の発明において、低圧鋳造機の
溶湯保持炉内の溶湯を加圧する気体の圧力を、所
定の目標パターンに従つて制御するために、その
気体供給回路に比例制御弁を設けることを提案し
ている。すなわち、第４図に示すように、保持炉
２１の給気孔２２を、並列に配置した２個の電磁
開閉弁２３，２４およびパワー減圧弁２３と保持
炉２１との間に圧力センサ２７を配設し、前記電
磁開閉弁２３，２４を、保持炉２１の溶湯上面を
最適に加圧するための最適加圧パターンを記憶し
たマイクロコンピユータ２８に電気的に接続し、
このマイクロコンピユータ２８に比例制御弁２９
および前記圧力センサ２７を電気的に接続し、こ
の比例制御弁２９を前記パワー減圧弁２５のパイ
ロツト部に接続した構造にして、保持炉２１内に
おける湯面上空間の圧力を圧力センサ２７を介し
て検知し、この圧力信号をマイクロコンピユータ
２８に入力し、これにより、マイクロコンピユー
タ２８において設定加圧パターンに基づいて溶湯
上面への必要加圧圧力を演算し、この演算結果に
従つて電磁開閉弁２３，２４を適宜開閉するとと
もに、比例制御弁２９を介して、パワー減圧弁２
５を作動調節し、もつて、圧力の制御された圧縮
空気を保持炉２１に所要時間供給し、保持炉２１
内の溶湯上面を目標パターンに従つて加圧するよ
うにしている。(Prior Art) The present applicant previously proposed, in the invention of Japanese Patent Application No. 60-95726 (Japanese Unexamined Patent Publication No. 61-253158), that the pressure of a gas that pressurizes the molten metal in the molten metal holding furnace of a low-pressure casting machine is , proposes to provide a proportional control valve in the gas supply circuit in order to control it according to a predetermined target pattern. That is, as shown in FIG. 4, the air supply hole 22 of the holding furnace 21 is connected to two electromagnetic on-off valves 23 and 24 arranged in parallel, and a pressure sensor 27 is arranged between the power pressure reducing valve 23 and the holding furnace 21. The electromagnetic on-off valves 23 and 24 are electrically connected to a microcomputer 28 that stores an optimal pressurization pattern for optimally pressurizing the upper surface of the molten metal in the holding furnace 21.
This microcomputer 28 has a proportional control valve 29.
The pressure sensor 27 is electrically connected, and the proportional control valve 29 is connected to the pilot part of the power pressure reducing valve 25, so that the pressure in the space above the hot water level in the holding furnace 21 is controlled via the pressure sensor 27. This pressure signal is input to the microcomputer 28, and the microcomputer 28 calculates the required pressurizing pressure to the upper surface of the molten metal based on the set pressurization pattern, and the electromagnetic on-off valve is activated according to the calculation result. 23 and 24 as appropriate, and the power pressure reducing valve 2 via the proportional control valve 29.
5, and then supply compressed air with controlled pressure to the holding furnace 21 for a required period of time.
The upper surface of the molten metal inside is pressurized according to a target pattern.
（発明が解決しようとする課題）
しかし、上述したような手段で比例制御弁２９
を作動して保持炉２１内の溶湯上面を加圧制御し
たとき、次のような問題があつた。すなわち、比
例制御弁２９に制御信号として各種のアナログ値
（V1，V2……）を入力した時、第２図に示すよう
に、比例制御弁２９が所定圧力を出力し得る状態
になるまでに時間がかかり、アナログ値入力に対
して圧力出力にタイプラグがあつた。そのため、
パワー減圧弁２５を介して保持炉２１に供給する
圧縮空気の圧力を、時間の経過とともに所定の目
標パターンで変化させようとすると、保持炉２１
内の圧力変化が目標パターンから大きく外れる問
題があつた。(Problem to be Solved by the Invention) However, the proportional control valve 29
When the upper surface of the molten metal in the holding furnace 21 was pressurized by operating the holding furnace 21, the following problem occurred. That is, when various analog values (V 1 , V 2 . . . ) are input as control signals to the proportional control valve 29, the proportional control valve 29 enters a state in which it can output a predetermined pressure, as shown in FIG. It took a long time to complete the process, and there was a type lag in the pressure output compared to the analog value input. Therefore,
When trying to change the pressure of compressed air supplied to the holding furnace 21 via the power pressure reducing valve 25 in a predetermined target pattern over time, the holding furnace 21
There was a problem in which the internal pressure changes deviated significantly from the target pattern.
本発明は、上記の問題を解消するためになされ
たもので、圧縮気体源としての圧縮空気源と保持
炉との間に配設した比例制御弁のタイムラグによ
る弊害を解消し、比例制御弁が、圧縮空気源から
の圧縮空気を、圧力が所定の目標パターンに対応
した圧力になるように変化されて送り出すことが
できる計算機による制御方法を提供することを目
的とする。 The present invention has been made in order to solve the above problems, and eliminates the adverse effects caused by the time lag of the proportional control valve disposed between the compressed air source as the compressed gas source and the holding furnace. An object of the present invention is to provide a computer-based control method that can send out compressed air from a compressed air source with the pressure changed to a pressure corresponding to a predetermined target pattern.
（課題を解決するための手段）
本発明は、上記の目的を達成するために、保持
炉内の上部を比例制御弁を介して圧縮気体源に連
通接続し、さらに前記比例制御弁を計算機に電気
的に接続して前記比例制御弁を前記計算機をもつ
て制御し、もつて前記保持炉内の圧力を、予め設
定された時間−圧力曲線の目標パターンに沿つて
変化させるようにした方法において、ある瞬間の
時刻（ti）より単位時間先の時刻（ti＋１）にお
ける目標圧力（Pi＋１）を、予め設定された時間
−圧力曲線の目標パターンに基づき算出し、この
算出された目標圧力（Pi＋１）に対応する比例制
御弁の定常アナログ値（Vo）を、前記計算機に
予め記憶された前記比例制御弁の定常アナログ値
データに基づき算出し、前記時刻（ti）における
前記保持炉内の圧力（Pm）を測定し、前記目標
圧力（Pi＋１）と前記保持炉内圧力（Pm）とか
ら圧力偏差（ΔP）を算出し、この算出された圧
力偏差（ΔP）に、予め設定されたゲイン（Ｇ）
を掛算して補正アナログ値（Vd）を算出し、前
記定常アナログ値（Vo）と前記補正アナログ値
（Vd）とを加算して、指令アナログ値（Ｖ）を算
出し、この算出されたアナログ値（Ｖ）を前記比
例制御弁に発信するようにする。(Means for Solving the Problems) In order to achieve the above object, the present invention connects the upper part of the holding furnace to a compressed gas source via a proportional control valve, and further connects the proportional control valve to a computer. In the method, the proportional control valve is electrically connected and controlled by the computer, so that the pressure in the holding furnace is changed along a target pattern of a preset time-pressure curve. , the target pressure (Pi+1) at a time (ti+1) a unit time ahead of a certain moment (ti) is calculated based on the target pattern of the time-pressure curve set in advance, and this calculated target pressure (Pi+1) The steady analog value (Vo) of the proportional control valve corresponding to is calculated based on the steady analog value data of the proportional control valve stored in advance in the computer, and the pressure (Pm ), a pressure deviation (ΔP) is calculated from the target pressure (Pi+1) and the holding furnace internal pressure (Pm), and a preset gain (G) is added to the calculated pressure deviation (ΔP).
A corrected analog value (Vd) is calculated by multiplying A value (V) is transmitted to the proportional control valve.
（作用）
本発明においては、ある瞬間の時刻（ti）より
単位時間先の時刻（ti＋１）における目標圧力
（Pi＋１）に基づいて算出した補正アナログ値
（Vd）が、時刻（ti）の定常アナログ値（Vo）に
加算され、この加算されたアナログ値がその時刻
（ti）の指令アナログ値（Ｖ）として比例制御弁
に入力される。すなわち、時刻（ti）の目標圧力
（Pi）が、単位時間先の時刻（ti＋１）に係る情
報に基づいて補正され、この補正結果に従つて比
例制御弁が作動され、比例制御弁によつて圧力を
制御された圧縮気体が前記保持炉に供給されるこ
ととなる。(Function) In the present invention, the corrected analog value (Vd) calculated based on the target pressure (Pi+1) at the time (ti+1) that is a unit time ahead of the time (ti) at a certain moment is the steady analog value at the time (ti). value (Vo), and this added analog value is input to the proportional control valve as the command analog value (V) at that time (ti). In other words, the target pressure (Pi) at time (ti) is corrected based on information regarding the time (ti+1) a unit time ahead, and the proportional control valve is operated according to the correction result. Compressed gas whose pressure is controlled is supplied to the holding furnace.
（実施例）
次に本発明の一実施例について、ブロツク図で
ある第１図およびフローチヤートである第３図に
基づき詳細に説明する。(Embodiment) Next, an embodiment of the present invention will be described in detail based on FIG. 1, which is a block diagram, and FIG. 3, which is a flowchart.
第１図に示すように、圧縮空気源１から発生し
た圧縮空気がミストセパレータ２、一次減圧弁
３、比例制御弁４、サージタンク５およびフイル
タ６を順に通つて溶湯保持炉７内に供給され、供
給された圧縮空気は、溶湯上面を押圧し、ストー
ク８を介して溶湯（Ｍ）を金型９に充填せしめる
ようになつている。そして、この溶湯充填行程中
においては、比例制御弁４が計算機１０により制
御されて、保持炉７には目標パターンに従つて圧
力を制御された圧縮空気が供給される。すなわ
ち、計算機１０においては、第３に示すように、
まず、ある瞬間の時刻（ti）より単位時間先の時
刻（ti＋１）の目標圧力（Pi＋１）が、予め設定
されて計算機１０に記憶された目標パターンから
読み出されイ、続いて、この読み出された目標圧
力（Pi＋１）に対応する比例制御弁４の定常アナ
ログ値（Vo）が、予め比例制御弁４の定常アナ
ログ値データを記憶している計算機１０から読み
取られるロ。一方、前記時刻（ti）における保持
炉７内の圧力Pmが圧力センサ１１により検出さ
れ、Ａ／Ｄ変換されて計算機１０に入力される
ハ。計算機１０に保持炉７の圧力信号が入力され
ると、前記目標圧力（Pi＋１）と保持炉７内の圧
力（Pm）とから圧力偏差（ΔP）が算出されニ続
いて、この圧力偏差（ΔP）に、予め設定された
ゲイン（Ｇ）が掛算されて補正アナログ値（Vd）
が算出されるホ。次いで、前記定常アナログ値
（Vo）と前記補正アナログ値（Vd）とが加算さ
れて指令アナログ値（Ｖ）が算出されヘ、続い
て、この指令アナログ値がＤ／Ａ変換されてアン
プリフアイヤ１２を介して比例制御弁４に入力さ
れるト。これにより、比例制御弁４の圧力が調製
され、これに伴ない、保持炉７内には、目標パタ
ーンに可及的に近ずくことができる圧力に制御さ
れた圧縮空気が供給されることとなる。 As shown in FIG. 1, compressed air generated from a compressed air source 1 is supplied into a molten metal holding furnace 7 through a mist separator 2, a primary pressure reducing valve 3, a proportional control valve 4, a surge tank 5, and a filter 6. The supplied compressed air presses the upper surface of the molten metal and fills the mold 9 with the molten metal (M) via the stalk 8. During this molten metal filling process, the proportional control valve 4 is controlled by the computer 10, and compressed air whose pressure is controlled according to the target pattern is supplied to the holding furnace 7. That is, in the computer 10, as shown in the third
First, the target pressure (Pi+1) at a time (ti+1) that is a unit time ahead of a certain moment (ti) is read out from a target pattern that has been set in advance and stored in the computer 10. The steady analog value (Vo) of the proportional control valve 4 corresponding to the target pressure (Pi+1) is read from the computer 10 that stores the steady analog value data of the proportional control valve 4 in advance. On the other hand, the pressure Pm in the holding furnace 7 at the time (ti) is detected by the pressure sensor 11, A/D converted, and input to the computer 10. When the pressure signal of the holding furnace 7 is inputted to the computer 10, the pressure deviation (ΔP) is calculated from the target pressure (Pi+1) and the pressure inside the holding furnace 7 (Pm). ) is multiplied by a preset gain (G) to obtain a corrected analog value (Vd).
is calculated. Next, the steady analog value (Vo) and the corrected analog value (Vd) are added to calculate a command analog value (V), and this command analog value is then D/A converted and sent to the amplifier amplifier. 12 to the proportional control valve 4. As a result, the pressure of the proportional control valve 4 is adjusted, and accordingly, compressed air is supplied into the holding furnace 7 at a pressure that can be as close to the target pattern as possible. Become.
以上の動作が時々刻々と行なわれ、その結果、
溶湯上面は目標パターンに圧力に非常に近似した
圧力で押圧されることとなる。このようにして、
金型９への注湯が完了した後、開閉弁１３を所定
時間開いて、保持炉７内の圧縮空気を排出させ
る。 The above operations are performed moment by moment, and as a result,
The upper surface of the molten metal is pressed against the target pattern with a pressure very close to the pressure. In this way,
After pouring the metal into the mold 9, the on-off valve 13 is opened for a predetermined period of time to discharge the compressed air in the holding furnace 7.
（発明の効果）
以上の説明からも明らかなように本発明によれ
ば、比例制御弁の定常アナログ値（Vo）に補正
アナログ値（Vd）が加算されてアナログ値（Ｖ）
が算出され、このアナログ値（Ｖ）が比例制御弁
に時々刻々入力されて比例制御弁が制御されるた
め、比例制御弁のタイムラグにより弊害が解消さ
れ、これに伴つて、保持炉内の圧力は目標パター
ンに非常に近づくことができるなどの優れた効果
を奏する。(Effects of the Invention) As is clear from the above explanation, according to the present invention, the correction analog value (Vd) is added to the steady analog value (Vo) of the proportional control valve, and the analog value (V) is
is calculated, and this analog value (V) is inputted to the proportional control valve from time to time to control the proportional control valve, eliminating the adverse effects caused by the time lag of the proportional control valve. has excellent effects such as being able to get very close to the target pattern.
第１図は本発明を適用した一実施例の装置ブロ
ツク図、第２図は比例制御弁の時間−圧力特性線
図、第３は、本発明を適用した一実施例のフロー
チヤート、第４図は、従来の低圧鋳造機の構成図
である。
１……圧縮空気源、４……比例制御弁、７……
溶湯保持炉、１０……計算機。
Fig. 1 is a device block diagram of an embodiment to which the present invention is applied, Fig. 2 is a time-pressure characteristic diagram of a proportional control valve, 3rd is a flowchart of an embodiment to which the present invention is applied, and 4th The figure is a configuration diagram of a conventional low pressure casting machine. 1...Compressed air source, 4...Proportional control valve, 7...
Molten metal holding furnace, 10...calculator.
Claims (1)
弁を介して圧縮気体源に連通接続し、さらに前記
比例制御弁を計算機に電気的に接続して、前記比
例制御弁を前記計算機によつて制御し、前記保持
炉内の圧力を、予め設定した時間−圧力曲線の目
標パターンに沿つて変化させるための低圧鋳造機
における比例制御弁の計算機による自動制御方法
であつて、ある瞬間の時刻（ti）より単位時間先
の時刻（ti＋１）における目標圧力（Pi＋１）
を、前記計算機に予め設定された時間−圧力曲線
の目標パターンに基づき算出し、この算出された
目標圧力（Pi＋１）に対応する比例制御弁の定常
アナログ値（Vo）を、前記計算機に予め記憶さ
れた前記比例制御弁の定常アナログ値データに基
づき算出し、前記時刻（ti）における前記保持炉
内の圧力（Pm）を測定し、前記目標圧力（Pi＋
１）と前記保持炉内圧力（Pm）の圧力偏差
（ΔP）を算出し、この算出された圧力偏差（ΔP）
に、予め設定されたゲイン（Ｇ）を掛算して補正
アナログ値（Vd）を算出し、前記定常アナログ
値（Vo）と前記補正アナログ値（Vd）とを加算
して指令アナログ値（Ｖ）を算出し、この算出さ
れた指令アナログ（Ｖ）を前記比例制御弁に発信
することを特徴とする低圧鋳造機における比例制
御弁の計算機による自動制御方法。1. The upper part of the molten metal holding furnace of the low-pressure casting machine is connected to a compressed gas source via a proportional control valve, and the proportional control valve is electrically connected to a computer, and the proportional control valve is controlled by the computer. An automatic control method using a computer for controlling a proportional control valve in a low-pressure casting machine for controlling the pressure in the holding furnace and changing the pressure in the holding furnace along a target pattern of a preset time-pressure curve, the method comprising: Target pressure (Pi+1) at time (ti+1) unit time ahead of (ti)
is calculated based on a target pattern of a time-pressure curve preset in the computer, and a steady analog value (Vo) of the proportional control valve corresponding to the calculated target pressure (Pi+1) is stored in the computer in advance. The pressure (Pm) in the holding furnace at the time (ti) is measured, and the target pressure (Pi+
1) Calculate the pressure deviation (ΔP) between the holding furnace internal pressure (Pm) and the calculated pressure deviation (ΔP).
is multiplied by a preset gain (G) to calculate a corrected analog value (Vd), and the steady analog value (Vo) and the corrected analog value (Vd) are added to obtain a command analog value (V). A computer-based automatic control method for a proportional control valve in a low-pressure casting machine, characterized in that the calculated command analog (V) is transmitted to the proportional control valve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1169886A JPS62169214A (en) | 1986-01-22 | 1986-01-22 | Method for controlling automatically proportional control valve by computer |
| US07/003,897 US4741381A (en) | 1986-01-22 | 1987-01-16 | Method of and apparatus for automatically controlling pressure in holding furnace incorporated in low pressure die-casting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1169886A JPS62169214A (en) | 1986-01-22 | 1986-01-22 | Method for controlling automatically proportional control valve by computer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62169214A JPS62169214A (en) | 1987-07-25 |
| JPH0426723B2 true JPH0426723B2 (en) | 1992-05-08 |
Family
ID=11785256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1169886A Granted JPS62169214A (en) | 1986-01-22 | 1986-01-22 | Method for controlling automatically proportional control valve by computer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62169214A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7683237B2 (en) * | 2021-02-18 | 2025-05-27 | Ｕｂｅマシナリー株式会社 | Gas Pressure Control Device |
-
1986
- 1986-01-22 JP JP1169886A patent/JPS62169214A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62169214A (en) | 1987-07-25 |
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