JPH0158057B2 - - Google Patents
Info
- Publication number
- JPH0158057B2 JPH0158057B2 JP6066580A JP6066580A JPH0158057B2 JP H0158057 B2 JPH0158057 B2 JP H0158057B2 JP 6066580 A JP6066580 A JP 6066580A JP 6066580 A JP6066580 A JP 6066580A JP H0158057 B2 JPH0158057 B2 JP H0158057B2
- Authority
- JP
- Japan
- Prior art keywords
- brake valve
- brake
- capacity pump
- mold
- solenoid
- 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
- 238000000034 method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 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
Description
【発明の詳細な説明】
本発明は射出成形機、ダイカストマシン、プレ
ス等のブレーキ回路に応用できるブレーキバルブ
の制御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake valve control method that can be applied to brake circuits of injection molding machines, die casting machines, presses, and the like.
第１図は従来のブレーキ回路の１例を示し、１
は型締シリンダ、２は型締ラム、３はブースタラ
ム、４は大容量ポンプ、５は小容量ポンプであ
る。６はブレーキバルブ、７，９，１０，１１，
１２はソレノイド付方向切換弁、８はパイロツト
操作チエツク弁、１３，１４はリリーフバルブで
ある。なお、ブレーキバルブ６はブレーキ開放と
ブレーキ作動のポジシヨンを有し、メインスプー
ルにより流量を絞つてブレーキをかける方式のも
のである。また型閉側（ブースタラム３）の断面
積をS1、型開側（型締ラム２のロツド側油圧部）
の断面積をS2とすると、S1はS2の約半分になつて
いる（S2≒2S1）。 Figure 1 shows an example of a conventional brake circuit.
2 is a mold clamping cylinder, 2 is a mold clamping ram, 3 is a booster ram, 4 is a large capacity pump, and 5 is a small capacity pump. 6 is the brake valve, 7, 9, 10, 11,
12 is a directional valve with a solenoid, 8 is a pilot operated check valve, and 13 and 14 are relief valves. The brake valve 6 has positions for releasing the brake and applying the brake, and is of a type that applies the brake by restricting the flow rate using the main spool. Also, the cross-sectional area of the mold closing side (booster ram 3) is S 1 , and the mold opening side (rod side hydraulic part of mold clamping ram 2)
If the cross-sectional area of is S 2 , then S 1 is approximately half of S 2 (S 2 ≒ 2S 1 ).
ここで先ず型閉動作のブレーキについて説明す
ると、型閉高速動作はソレノイドA.D.Fが励磁さ
れ、大容量ポンプ４と小容量ポンプ５から吐出さ
れた油は、全てポートａからポートｂを経てブー
スタラム３へ送り込まれることによつて行なわれ
る。その時断面積S2からの戻り油は、ポートｃか
らポートｄ，ｅを経てタンクへ流れる。 First, to explain the brake for the mold closing operation, the solenoid ADF is energized for the high speed mold closing operation, and all the oil discharged from the large capacity pump 4 and small capacity pump 5 is sent from port a to the booster ram 3 via port b. This is done by being sent. The return oil from the cross-sectional area S 2 then flows from port c to the tank via ports d and e.
次に型閉高速から低速に移るには、前記の状態
からソレノイドＤを消磁させて大容量ポンプ４か
らの吐出油を切り、かつソレノイドＣを励磁させ
てブレーキバルブ６のポジシヨンを、ブレーキ開
放側からブレーキ作動側に切換え、断面積S2から
の戻り油に背圧を生じさせてブレーキをかける。 Next, in order to shift from the mold closing high speed to the low speed, the solenoid D is demagnetized from the above state to cut off the oil discharged from the large capacity pump 4, and the solenoid C is energized to change the position of the brake valve 6 to the brake release side. The switch is switched to the brake activation side, creating back pressure in the return oil from the cross-sectional area S 2 and applying the brake.
次に型開高速動作は、ソレノイドＡ，Ｂ，Ｄ，
Ｇが励磁され、大容量ポンプ４及び小容量ポンプ
５から吐出された油が全てポートｅからポート
ｄ，ｃを経て型開側の断面積S2に送り込まれる。
その時ブースタラム３の断面積S1からの戻り油が
ポートｇからポートｈを経てｅからの前記ポンプ
吐出油と共にポートｄ，ｃへ通じ、断面積S2へ流
れることによつて行なわれる。 Next, for high-speed mold opening operation, solenoids A, B, D,
G is excited, and all the oil discharged from the large-capacity pump 4 and the small-capacity pump 5 is sent from port e through ports d and c to the cross-sectional area S 2 on the mold opening side.
This is done by the return oil from the cross section S 1 of the booster ram 3 passing from port g through port h to ports d and c together with the pump discharge oil from e and flowing to the cross section S 2 .
即ち、S2≒2S1であるから、型開側（断面積S2）
と型閉側（断面積S1）とで、ランアラウンド
（run around）回路を形成し、S2−S1≒S1の面積
が型開高速時に有効で、型開高速と型閉高速とほ
ぼ同じ速度になる。 That is, since S 2 ≒ 2S 1 , the mold opening side (cross-sectional area S 2 )
and the mold closing side (cross-sectional area S 1 ) form a run around circuit, and the area S 2 − S 1 ≒ S 1 is effective at the mold opening speed, and the mold opening speed and mold closing speed are the same. almost the same speed.
次に型開高速から低速に移るには、前記の状態
からソレノイドＤを消磁させて、大容量ポンプ４
からの吐出油を切り、かつソレノイドＣを励磁さ
せて、ブレーキバルブ６のポジシヨンをブレーキ
開放側からブレーキ作動側に切換えて、ブースタ
ラム３（断面積S1）からの戻り油と小容量ポンプ
５からの吐出油との合流油を絞り、背圧を生じさ
せてブレーキをかける。なお、型閉及び型開のブ
レーキバルブ作動の際に、ブレーキバルブのスプ
ールが開放側から作動側へ移動する時間があるの
で、ソレノイドＣの励磁は、ソレノイドＤの消磁
の時点より早い時点で行なう。 Next, in order to shift from high speed to low speed for mold opening, demagnetize solenoid D from the above state, and then
The oil discharged from the booster ram 3 (cross-sectional area S 1 ) is cut off, the solenoid C is energized, and the position of the brake valve 6 is switched from the brake release side to the brake application side, and the return oil from the booster ram 3 (cross-sectional area S 1 ) and the small capacity pump 5 are removed. The combined oil with the discharged oil is throttled, creating back pressure and applying the brakes. Note that when the brake valve is activated to close and open the mold, there is time for the brake valve spool to move from the open side to the activated side, so solenoid C should be energized earlier than solenoid D is deenergized. .
しかしながら以上のような従来の油圧回路に
は、次のような欠点があつた。即ち、ブレーキバ
ルブの時間遅れ（ソレノイドＣの励磁後、ブレー
キバルブのスプールが開放側から作動側へ移動す
る時間）が、油温、ブレーキバルブの個体差等で
ばらつくため、大容量ポンプのアンロードの時点
（ソレノイドＤを励磁する時点）と、ブレーキバ
ルブ作動のタイミング（ソレノイドＣを励磁する
時点）を一定時間に固定することができず、その
都度調整する必要があつた。また調整方法も、作
業者の勘と熟練によるものであり、調整に多くの
時間を費していた。 However, the conventional hydraulic circuit as described above has the following drawbacks. In other words, the time delay of the brake valve (the time it takes for the brake valve spool to move from the open side to the actuated side after solenoid C is energized) varies depending on oil temperature, individual differences in brake valves, etc., so it is difficult to unload the large capacity pump. The time point (the time point when solenoid D is energized) and the timing of brake valve operation (the time point when solenoid C is energized) cannot be fixed to a fixed time, and it is necessary to adjust them each time. Furthermore, the adjustment method depends on the intuition and skill of the operator, and a lot of time is spent on adjustment.
本発明は前記従来の欠点を解消するために提案
されたもので、大容量ポンプと小容量ポンプから
供給された油圧によりピストンが移動し、その際
の吐出油の排出回路上にブレーキバルブを配設
し、同ブレーキバルブの作動によりピストンの移
動速度を高速から低速に制御するブレーキバルブ
の制御方法において、前記吐出口とブレーキバル
ブとの間で背圧を測定し、同ブレーキバルブ作動
後背圧の検出値が基準値に達した時、大容量ポン
プをアンロードして高速から低速へ切換えるよう
にした制御方法であり、ブレーキバルブのタイミ
ング調整が不要で、常にブレーキが最適に作動す
るブレーキバルブを用いたブレーキ回路を実現す
ることができるブレーキバルブの制御方法を提供
せんとするものである。 The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and a piston is moved by hydraulic pressure supplied from a large-capacity pump and a small-capacity pump, and a brake valve is disposed on the discharge circuit of the discharged oil at that time. In this brake valve control method, the back pressure is measured between the discharge port and the brake valve, and the back pressure is measured after the brake valve is operated. This control method unloads the large-capacity pump and switches from high speed to low speed when the detected value reaches a reference value.There is no need to adjust the brake valve timing, and the brake valve always operates optimally. It is an object of the present invention to provide a brake valve control method that can realize the brake circuit used in the present invention.
以下本発明の実施例を図面について説明する。
なお、本発明の実施例を示す第２図のブレーキ回
路に於いて従来と同一部分は同一の符号を用いて
説明することにする。さて第２図に於いて１は型
締シリンダ、２は型締ラム、３はブースタラム、
４は大容量ポンプ、５は小容量ポンプ、６はブレ
ーキバルブ、８はパイロツト操作チエツク弁、
７，９，１０，１１，１２はソレノイド付方向切
換弁、１３，１４はリリーフバルブで、これらは
第１図の場合と同じである。 Embodiments of the present invention will be described below with reference to the drawings.
In the brake circuit shown in FIG. 2 showing an embodiment of the present invention, parts that are the same as those of the conventional brake circuit will be described using the same reference numerals. Now, in Figure 2, 1 is the mold clamping cylinder, 2 is the mold clamping ram, 3 is the booster ram,
4 is a large capacity pump, 5 is a small capacity pump, 6 is a brake valve, 8 is a pilot operated check valve,
7, 9, 10, 11, and 12 are directional valves with solenoids, and 13 and 14 are relief valves, which are the same as in FIG. 1.
２ａは型締ラム２のロツド、２ｂはピストン、
１ａはシリンダ１の内面と型締ラム２のロツド２
ａ外面とで形成されるロツド側シリンダ室、１ｂ
は反ロツド側シリンダ室である。２０は同ロツド
側シリンダ室（型開側）１ａとブレーキバルブ６
の間に設けた背圧測定用の圧力検出装置、２１
は、ブレーキバルブ６のスプールが作動のポジシ
ヨンにきたことを示す背圧の基準値として型閉時
に第３図に於けるロツド側シリンダ室１ａの圧力
PBCを、型開時に第４図に於けるロツド側シリン
ダ室１ａの圧力をPBOを設定するための電気信号
発信装置（型閉と型開で基準値が違う理由は後述
する）である。 2a is the rod of the mold clamping ram 2, 2b is the piston,
1a is the inner surface of the cylinder 1 and the rod 2 of the mold clamping ram 2
a rod side cylinder chamber formed by the outer surface, 1b
is the cylinder chamber on the anti-rod side. 20 is the same rod side cylinder chamber (mold opening side) 1a and brake valve 6
A pressure detection device for measuring back pressure provided between 21
is the pressure in the rod side cylinder chamber 1a in Fig. 3 when the mold is closed as the reference value of the back pressure indicating that the spool of the brake valve 6 has reached the operating position.
This is an electrical signal transmitting device for setting P BC and the pressure in the rod side cylinder chamber 1a in Fig. 4 when the mold is opened to P BO (the reason why the reference values are different between mold closing and mold opening will be explained later). .
２２は比較判定器、２３は型開閉動作中、ソレ
ノイドＤを励磁して高速動作を得るための電気信
号発生装置、２４は前記比較判定器２２の出力信
号を入力したとき、前記電気信号発生装置２３の
電気信号を切る回路遮断装置である。なお、第３
図のＸはソレノイドＣが励磁した時、Ｙはブレー
キバルブのスプールが作動のポジシヨンに入つた
時点、Ｚは大容量ポンプをアンロードして高速か
ら低速へ切換える点、第４図のＶはソレノイドＣ
が励磁した時、Ｗはブレーキバルブのスプールが
作動のポジシヨンに入つた時点を示す。 22 is a comparison/judgment device; 23 is an electric signal generation device for exciting the solenoid D to obtain high-speed operation during mold opening/closing operations; and 24 is the electrical signal generation device when the output signal of the comparison/judgment device 22 is input. This is a circuit breaker device that cuts off 23 electrical signals. In addition, the third
In the diagram, X is when solenoid C is energized, Y is when the brake valve spool enters the operating position, Z is when the large capacity pump is unloaded and switched from high speed to low speed, and V in Figure 4 is the solenoid. C
When is energized, W indicates the point at which the brake valve spool is in the operating position.
次に作用を説明すると、先ず基準値が型閉と型
開で違う理由について述べる。第３図の型閉時に
於けるロツド側シリンダ室１ａの圧力基準値の
PBCは、型閉高速時の戻り油がブレーキバルブ６
により絞り始められることによつて上昇した時の
背圧である（第３図）。 Next, to explain the effect, first we will discuss the reason why the reference value is different between mold closing and mold opening. The pressure reference value of the rod side cylinder chamber 1a when the mold is closed in Fig. 3.
In P BC , the return oil during mold closing at high speed is the brake valve 6.
This is the back pressure that rises due to the start of constriction (Figure 3).
また型開時のブレーキになる背圧は、反ロツド
側シリンダ室１ｂの圧力である。ここでブレーキ
バルブ６のスプールが移動してブレーキ作動のポ
ジシヨンに入ると、ブースタラム３からランアラ
ウンド回路を通つてきた戻り油を絞ることによ
り、反ロツド側シリンダ室１ｂの圧力が上昇す
る。これにより型締ラム２の後退に対する抵抗が
増すため、供給側に当るロツド側シリンダ室１ａ
の圧力が上昇する（第４図）。この時上昇したロ
ツド側シリンダ室１ａの圧力を基準値PBOとする。 Also, the back pressure that acts as a brake when the mold is opened is the pressure in the cylinder chamber 1b on the side opposite to the rod. When the spool of the brake valve 6 moves and enters the brake operation position, the return oil that has passed through the runaround circuit from the booster ram 3 is throttled, thereby increasing the pressure in the cylinder chamber 1b on the anti-rod side. This increases the resistance to the retreat of the mold clamping ram 2, so the rod side cylinder chamber 1a on the supply side
The pressure increases (Figure 4). The pressure in the rod side cylinder chamber 1a that has increased at this time is defined as a reference value PBO .
以上のように型閉時は、ブレーキ作用する背圧
（ロツド側シリンダ室）を測定することにより、
型開時はブレーキ作用する背圧に応じて上昇する
供給側の負荷圧（ロツド側シリンダ室）を測定す
ることにより、ブレーキ作動のポジシヨンは否か
を検知するので、型閉と型開で基準値に差が生ず
る。 As mentioned above, when the mold is closed, by measuring the back pressure (rod side cylinder chamber) that applies the brake,
When the mold is opened, the load pressure on the supply side (rod side cylinder chamber), which increases in response to the back pressure applied by the brake, is measured to detect whether or not the brake is in the position. There will be a difference in the values.
次に型閉動作における制御装置の作用について
述べると、型閉動作開始の信号が電気信号発生装
置２３によつて発信されて、ソレノイドＤが励磁
されると、大容量ポンプ４及び小容量ポンプ５の
全吐出量が、ブースタラム３に送り込まれて型締
ラム２が高速で前進する。このとき第３図から分
かるように、背圧は基準値PBCより小さいので、
比較判定装置２２は出力信号を発しない。 Next, to describe the action of the control device in the mold closing operation, when a signal to start the mold closing operation is transmitted by the electric signal generator 23 and the solenoid D is energized, the large capacity pump 4 and the small capacity pump 5 The entire discharge amount is sent to the booster ram 3, and the mold clamping ram 2 moves forward at high speed. At this time, as can be seen from Figure 3, the back pressure is smaller than the reference value P BC , so
Comparison/determination device 22 does not issue an output signal.
次にソレノイドＣが励磁されると、ブレーキバ
ルブ６のスプールが開放側から作動側へ移動開始
する（第３図のブレーキバルブ６のスプールの変
位参照）。ブレーキバルブ６のスプールが作動の
ポジシヨンまで達すると、圧力検出装置２０で検
出する圧力が急上昇し、この値が電気信号発生装
置２１で設定したロツド側シリンダ室１ａの圧力
値PBCと一致した時、比較判定装置２２が出力信
号を発し、それを入力して回路遮断装置２４がソ
レノイドＤへの励磁電流を切る。即ち、大容量ポ
ンプをアンロードする。また型開動作の場合はラ
ンアラウンド回路を使用すること、基準値がPBO
になることが違うだけで制御装置の動作は型閉と
同一である。 Next, when the solenoid C is energized, the spool of the brake valve 6 starts moving from the opening side to the operating side (see displacement of the spool of the brake valve 6 in FIG. 3). When the spool of the brake valve 6 reaches the operating position, the pressure detected by the pressure detection device 20 rises rapidly, and when this value matches the pressure value P BC of the rod side cylinder chamber 1a set by the electric signal generator 21. , the comparison/judgment device 22 issues an output signal, which is input to the circuit breaker 24 to cut off the excitation current to the solenoid D. That is, the large capacity pump is unloaded. Also, in the case of mold opening operation, a runaround circuit must be used, and the reference value is P BO
The operation of the control device is the same as for mold closing, except that the
以上詳細に説明した如く本発明によると、ロツ
ド側シリンダ室の背圧を測定することによつて高
速から低速へ切換えるとき、確実にブレーキを作
動させることができる。従来は大容量ポンプのア
ンロードする位置を設定する度に、ソレノイドＣ
のタイミングを調整していたが、本発明方法によ
ると、ソレノイドＣの作動する（これより少し遅
れて大容量ポンプがアンロードする）位置を設定
するだけで、確実なブレーキ作動がえられる。 As described in detail above, according to the present invention, by measuring the back pressure in the rod side cylinder chamber, the brake can be reliably operated when switching from high speed to low speed. Conventionally, every time you set the unloading position of a large capacity pump, solenoid C
However, according to the method of the present invention, reliable brake operation can be achieved by simply setting the position where solenoid C is activated (the large-capacity pump is unloaded a little later than this).
第１図は従来の射出成形機に於けるブレーキ回
路の１例を示す回路図、第２図は本発明の方法を
実施するブレーキ回路の回路図、第３図は型閉動
作に於ける速度、圧力の変化を示す線図、第４図
は型開動作に於ける速度と各圧力の変化を示す線
図である。
図の主要部分の説明 １…型締シリンダ、２…
型締ラム、３…ブースタラム、４…大容量ポン
プ、５…小容量ポンプ、６…ブレーキバルブ、２
０…背圧測定用の圧力検出装置、２１，２３…電
気信号発信装置、２２…比較判定器、２４…回路
遮断装置。
Figure 1 is a circuit diagram showing an example of a brake circuit in a conventional injection molding machine, Figure 2 is a circuit diagram of a brake circuit implementing the method of the present invention, and Figure 3 is a diagram showing the speed of mold closing operation. , a diagram showing changes in pressure, and FIG. 4 is a diagram showing changes in speed and pressure in the mold opening operation. Explanation of main parts of the diagram 1...mold clamping cylinder, 2...
Mold clamping ram, 3...Booster ram, 4...Large capacity pump, 5...Small capacity pump, 6...Brake valve, 2
0... Pressure detection device for measuring back pressure, 21, 23... Electric signal transmitting device, 22... Comparison/judgment device, 24... Circuit breaking device.
Claims (1)
油圧によりピストンが移動し、その際の吐出油の
排出回路上にブレーキバルブを配設し、同ブレー
キバルブの作動によりピストンの移動速度を高速
から低速に制御するブレーキバルブの制御方法に
おいて、前記吐出口とブレーキバルブとの間で背
圧を測定し、同ブレーキバルブ作動後背圧の検出
値が基準値に達した時、大容量ポンプをアンロー
ドして高速から低速へ切換えることを特徴とする
ブレーキバルブ制御方法。1 The piston is moved by hydraulic pressure supplied from a large capacity pump and a small capacity pump, and a brake valve is installed on the discharge circuit of the discharged oil at that time, and the movement speed of the piston is changed from high to low by the operation of the brake valve. In the brake valve control method, the back pressure is measured between the discharge port and the brake valve, and when the detected value of the back pressure reaches a reference value after the brake valve is operated, the large capacity pump is unloaded. A brake valve control method characterized by switching from high speed to low speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6066580A JPS56157309A (en) | 1980-05-09 | 1980-05-09 | Control of brake valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6066580A JPS56157309A (en) | 1980-05-09 | 1980-05-09 | Control of brake valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56157309A JPS56157309A (en) | 1981-12-04 |
| JPH0158057B2 true JPH0158057B2 (en) | 1989-12-08 |
Family
ID=13148847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6066580A Granted JPS56157309A (en) | 1980-05-09 | 1980-05-09 | Control of brake valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56157309A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58194524A (en) * | 1982-05-10 | 1983-11-12 | Tekunopurasu:Kk | Controlling method of operations of opening and closing mold in straight hydraulic mold clamping apparatus |
| JP5673482B2 (en) | 2011-10-19 | 2015-02-18 | 株式会社豊田自動織機 | Injection device |
| CN103769538A (en) * | 2013-12-31 | 2014-05-07 | 江苏南铸科技股份有限公司 | Die |
-
1980
- 1980-05-09 JP JP6066580A patent/JPS56157309A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56157309A (en) | 1981-12-04 |
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