CN1227108C - Mold protecting method for servo driven sandwich mold unit - Google Patents

Mold protecting method for servo driven sandwich mold unit Download PDF

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Publication number
CN1227108C
CN1227108C CN 02100909 CN02100909A CN1227108C CN 1227108 C CN1227108 C CN 1227108C CN 02100909 CN02100909 CN 02100909 CN 02100909 A CN02100909 A CN 02100909A CN 1227108 C CN1227108 C CN 1227108C
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CN
China
Prior art keywords
moving platen
mold
servo motor
torsion
servo
Prior art date
Application number
CN 02100909
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Chinese (zh)
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CN1432462A (en
Inventor
刘兴昌
赖根贤
张汉杰
徐玉竹
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财团法人工业技术研究院
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Priority to CN 02100909 priority Critical patent/CN1227108C/en
Publication of CN1432462A publication Critical patent/CN1432462A/en
Application granted granted Critical
Publication of CN1227108C publication Critical patent/CN1227108C/en

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Abstract

The present invention relates to a mold protecting method for a servo driven sandwich mold unit. The torque output of a servo motor for generating a power source is changed according to the different positions of the movable mold plate of a mold so as to achieve the effect of low-pressure protection. The set value of an encoder on the servo motor is compared with a signal received during the displacement of the movable mold plate so as to test the existence of foreign matters in the mold for normal or abnormal treatment.

Description

The mold protecting method of servo driven sandwich mold unit

Technical field

The present invention is relevant with the mould of servo driven sandwich mold unit, is meant a kind of mold protecting method of servo driven sandwich mold unit in detail.

Background technology

With general now Jet forming machine, include a board, a sandwich mold unit, an injection unit and an electric-control system substantially; Wherein this sandwich mold unit mainly has a mould, a most bar and toggle mechanism of hitting, this mould has a quiet template and a moving platen, these hit bar in order to link this quiet template and this moving platen, this toggle mechanism is linked in one in order between the actuator and this moving platen that produce power, and can be by the driving of this actuator, this moving platen is driven by this toggle mechanism, and hit bar along these and advance or retreat, and with this quiet template clamping or separate.

For avoiding this moving platen in the stroke of clamping feeding, as when running into foreign matter, have the situation of pushing foreign matter and take place, design has a guard method, to lower the impaired of mould; And general guard method in the stroke of moving platen feeding, is set a mold protection section and a moving platen by the time upper limit of this mold protection section starting point between to terminal, and makes this moving platen adopt low pressure and low speed by this mold protection section; So, this moving platen then is judged as the existence that foreign matter is arranged in this mould when failing in the upper limit of this mould guard time by this mold protection section, and makes this moving platen stop start or return reset condition;

Though, this moving platen passes through this mold protection section with low pressure and low speed, but, because this moving platen is subjected to the interlock of this toggle mechanism, and this toggle mechanism has the characteristic that changes its mechanical advantage with the position, makes this moving platen when conflicting to foreign matter, and its mechanical advantage that acts on this moving platen has increased the low pressure source that non-Dan Youyuan actuator is exported, the pressure of pushing between this mould and foreign matter is heightened, and then make this mould have impaired situation generation; And, must be after the upper limit of waiting for the mould guard time,, can confirm the existence of this foreign matter, and make this moving platen return initial point yet by when the terminal point of this mold protection section as this moving platen; The guard method of this kind is slower, and can't do the processing (moving platen is return initial point) of anomaly immediately in time when this moving platen supports the chance foreign matter, will cause mould to still have the phenomenon of damage.

In addition, have whether a kind of output with motor current serves as unusual, and directly as detecting the existence whether foreign matter is arranged in the mould; But utilize the mode of current anomaly, must on a controller, be provided with a magnitude of current measuring point, and on motor, also must be provided with the electric current output point, this measure not only has the resolution of measuring point problem not good and that disturbed by noise and produces, and has the reliability deficiency and the comparatively expensive problem of cost need be considered in practical application.

Summary of the invention

Main purpose of the present invention is to provide a kind of mold protecting method of servo driven sandwich mold unit, can be in the stroke of mould feeding, and detect immediately and whether have or not foreign matter in the mould and further process program.

For achieving the above object, the mold protecting method of servo driven sandwich mold unit provided by the invention, its step is as follows:

One,, changes torsion output, to reach the protection effect of low pressure in order to a servo motor that produces power source according to the diverse location of mould moving platen;

Wherein the torsion of this servo motor output change is to represent according to following formula:

Tq(x)%=1/F(x)×Gain%

Wherein

X is the position of moving platen;

The torsion that Tq (x) produces for servo motor, different with the position of moving platen, its torque maximum is output as 100%;

F (x) is the mechanical advantage of toggle mechanism, and is different with the position of moving platen;

The meaning of Gain: under the torsion output of minimum, still can keep moving platen and be principle according to the setting speed motion with servo motor;

The decision of Gain: look for the numerical value of setting speed motion from minimum of a value;

Two, utilize in the encoder of servo motor, its setting value under moving platen proper motion state is made comparisons with the actual value that moving platen actual motion state is produced down, has or not foreign matter to detect in the mould, and makes normal or abnormity processing.

Wherein whether the signal that this encoder received is unusual, and whether export according to the torsion of servo motor is that setting value is foundation.

Whether wherein whether the signal that this encoder received is unusual, be that setting value is foundation according to the position of moving platen.

Wherein whether the signal that this encoder received unusual, according to time of moving platen displacement point whether be that setting value is foundation.

Wherein the velocity of displacement of this moving platen is a certain value.

Wherein this moving platen is by toggle mechanism institute interlock.

Description of drawings

Understand for having for purpose of the present invention, feature and effect further, lift preferred embodiment of the present invention, and cooperate following accompanying drawing to elaborate, wherein:

Fig. 1 is the flow chart of a preferred embodiment of the present invention;

Fig. 2 is in the preferred embodiment of the present invention, the position of moving platen and the graph of relation of mechanical advantage that toggle mechanism produces;

Fig. 3 is in the preferred embodiment of the present invention, and motor torque is exported the graph of relation with the moving platen position.

The specific embodiment

See also Fig. 1 to Fig. 3, be the mold protecting method of a kind of servo driven sandwich mold unit that a preferred embodiment of the present invention provides, its step is as follows:

One,, change the torsion output of servo motor according to the diverse location of moving platen:

Because the toggle mechanism that driven by servo motor; when the torque (torsion) of exporting at servo motor is a steady state value; have with the position of moving platen move and characteristic that the mechanical advantage that torsion produced of servo motor is followed change (as shown in Figure 2; the graph of a relation of moving platen position and mechanical advantage that toggle mechanism produces); therefore can be by the mechanical advantage variation relation of above-mentioned this moving platen position and toggle mechanism; and setting this moving platen under a velocity of displacement of being scheduled to; it is anti-ballistic that to go out to desire to make the suffered thrust of this moving platen (mould protection) perseverance be in the low voltage value scope time; make torque (torsion) output of this servo motor and the relation (as shown in Figure 3) between this moving platen position, can be expressed from the next:

Tq(x)%=1/F(x)×Gain

Wherein

X is the position of moving platen;

The motive force (torsion) that Tq (x) produces for servo motor, different with the position of moving platen, its torque maximum is output as 100%;

F (x) is the mechanical advantage of toggle mechanism, and is different with the position of moving platen;

The meaning of Gain: under torque (torsion) output of minimum, still can keep moving platen and be principle according to the setting speed motion with servo motor;

The decision of Gain: look for from minimum of a value, as 1,2 ... 100.

By the following formula explanation as can be known, under normal condition, the user is in setting the clamping process, after the velocity conditions of this moving platen in the mold protection section, the output of the torsion of this servo motor will be moved and change with the position of moving platen, the condition of its change makes a variation according to following two factors, and one is the inverse function of the mechanical advantage of toggle mechanism product; It two is output as principle for the minimum torque of closing under the mould at setting speed; Make this moving platen in the mold protection section along with the difference of itself position, and only be supplied to the movably minimum torsion of motor, reach the low-voltage variation effect.

Two, detect whether have or not foreign matter in the mould by encoder:

By following formula explanation, can be when setting this moving platen in the speed of this mold protection section intrinsic displacement, with following three corresponding parameters, promptly one, this moving platen is positioned at the position of mold protection section any point; Two, servo motor is responded the output of moving platen different torsion that the position is done; Three, the starting point of mold protection section is between the terminal point of mold protection section, and moving platen is positioned at the required displacement time on any point etc.; Make a parameter and set (be about to the moving platen position, move so far required time and the motor institute in position does parameter setting in response to the torsion of output) in the encoder (Encoder) of this servo motor; And can be by the setup parameter in this encoder; during with actual clamping; moving platen is through the output of servo motor torsion, the moving platen displacement that is received in this mold protection section, the instant analyses and comparison of time intercropping that reach the arbitrary displacement point of moving platen; make when setting value and actual value have the generation of error amount; promptly be considered as having in this mould the existence of foreign matter; and make abnormity processing, can judge by this encoder and have or not foreign matter in the mould, and whether decision returns initial point with this moving platen.

In other words; encoder is made a setting value with the required mould of keeping according to the required time that servo motor torsion, moving platen position and the moving platen of normal speed motion state moves to location point; and this setting value is made a command pulse signal export on this motor; with foundation as the protection mould; and whether the comparison that performs an analysis of the every numerical value when simultaneously a setting value is with actual start thus have or not the generation of error amount, with the foundation as unusual judgement.

After above-mentioned detailed explanation, again detailed process of the present invention is summarized as follows:

As shown in Figure 1; at first; set the speed of moving platen desire by this mold protection section; and assign the order of clamping; make moving platen when entering the starting point of this mold protection section; according to the speed feeding of setting; and according to moving platen at the diverse location in this mold protection section, make the different torsion of this servo motor output, and can be by the difference that this toggle mechanism produced; mechanical advantage is bestowed the thrust of this moving mold one low pressure range; and by the parameter value that sets in the encoder; the every numerical value that is produced during with the actual start analysis that compares when producing error, is considered as that promptly foreign matter is arranged in the mould; and can make abnormity processing simultaneously; during as errorless difference, then continue the action of clamping, make this moving platen by behind the terminal point of this mold protection section; should moving platen and this quiet template, and finish the action of clamping with high-voltage lock mould.

Above-mentioned mold protecting method one preferred embodiment that is servo driven sandwich mold unit provided by the present invention then is described as follows its advantage again:

One,, and only keeps this moving platen and can under predetermined speed, move owing to the torsion of this servo motor changes (promptly the mechanical advantage in response to toggle mechanism changes) in response to the position of moving platen; And can make this mould in the mold protection section, and pushed by the thrust of a low pressure, this mould is not had when conflicting with foreign matter squeeze the strength push away foreign matter, and being reduced to, the damage of this mould supports most.

Two, because the encoder of this servo motor, required servo motor torsion, moving platen position, the time of moving platen displacement point and the speed of moving platen displacement of keeping mould proper motion state is made as definite value, and produce the command pulse signal to this servo motor, and the numerical value compare of analysis during with actual clamping, with as whether having or not foreign matter or unusual basis for estimation in the mould, and but immediate response makes abnormity processing, and the damage of mould is minimized.

The above only is preferred embodiment of the present invention, changes and ought to be included in the claim of the present invention so use equivalent structure that specification of the present invention and claim do such as.

Claims (6)

1, a kind of mold protecting method of servo driven sandwich mold unit, its step is as follows:
(1), according to the diverse location of mould moving platen, change torsion output, to reach the protection effect of low pressure in order to a servo motor that produces power source;
Wherein the torsion of this servo motor output change is to represent according to following formula:
Tq(x)%=1/F(x)×Gain%
Wherein
X is the position of moving platen;
The torsion that Tq (x) produces for servo motor, different with the position of moving platen, its torque maximum is output as 100%;
F (x) is the mechanical advantage of toggle mechanism, and is different with the position of moving platen;
The meaning of Gain: under the torsion output of minimum, still can keep moving platen and be principle according to the setting speed motion with servo motor;
The decision of Gain: look for the numerical value of setting speed motion from minimum of a value;
(2), utilize in the encoder of servo motor, its setting value under moving platen proper motion state is made comparisons with the actual value that moving platen actual motion state is produced down, has or not foreign matter to detect in the mould, and makes normal or abnormity processing.
Whether according to the mold protecting method of the described servo driven sandwich mold unit of claim 1, it is characterized in that 2, wherein whether the signal that this encoder received is unusual, exporting according to the torsion of servo motor is that setting value is foundation.
Whether according to the mold protecting method of the described servo driven sandwich mold unit of claim 1, it is characterized in that 3, wherein whether the signal that this encoder received is unusual, be that setting value is foundation according to the position of moving platen.
According to the mold protecting method of the described servo driven sandwich mold unit of claim 1, it is characterized in that 4, wherein whether the signal that this encoder received unusual, according to time of moving platen displacement point whether be that setting value is foundation.
According to the mold protecting method of the described servo driven sandwich mold unit of claim 1, it is characterized in that 5, wherein the velocity of displacement of this moving platen is a certain value.
According to the mold protecting method of the described servo driven sandwich mold unit of claim 1, it is characterized in that 6, wherein this moving platen is by toggle mechanism institute interlock.
CN 02100909 2002-01-07 2002-01-07 Mold protecting method for servo driven sandwich mold unit CN1227108C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02100909 CN1227108C (en) 2002-01-07 2002-01-07 Mold protecting method for servo driven sandwich mold unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 02100909 CN1227108C (en) 2002-01-07 2002-01-07 Mold protecting method for servo driven sandwich mold unit

Publications (2)

Publication Number Publication Date
CN1432462A CN1432462A (en) 2003-07-30
CN1227108C true CN1227108C (en) 2005-11-16

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Application Number Title Priority Date Filing Date
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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4177800B2 (en) * 2003-12-25 2008-11-05 日精樹脂工業株式会社 Mold protection method for mold clamping device
DE102004043300A1 (en) * 2004-09-08 2006-03-09 Krauss-Maffei Kunststofftechnik Gmbh Method for operating an injection molding machine
JP4568350B2 (en) * 2008-05-26 2010-10-27 ファナック株式会社 Abnormality detection device for injection molding machine
JP5016707B2 (en) * 2010-07-27 2012-09-05 日精樹脂工業株式会社 Belt monitoring device for injection molding machine
CN101954729B (en) * 2010-09-14 2012-09-26 浙江申达机器制造股份有限公司 Digital feedback mould adjustment system device
JP5155432B1 (en) * 2011-10-18 2013-03-06 ファナック株式会社 Abnormality detection device for injection molding machine
JP5155439B1 (en) * 2011-12-20 2013-03-06 ファナック株式会社 Abnormality detection device for injection molding machine

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Granted publication date: 20051116

Termination date: 20170107