CN103029276B - Method for setting clamping force of injection mold and clamping force setting apparatus - Google Patents

Method for setting clamping force of injection mold and clamping force setting apparatus Download PDF

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Publication number
CN103029276B
CN103029276B CN201210369361.4A CN201210369361A CN103029276B CN 103029276 B CN103029276 B CN 103029276B CN 201210369361 A CN201210369361 A CN 201210369361A CN 103029276 B CN103029276 B CN 103029276B
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clamping force
mold clamping
setting
mentioned
metal pattern
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CN103029276A (en
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田近雅也
武田信人
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Fanuc Corp
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Fanuc Corp
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    • 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
    • B29C45/7653—Measuring, controlling or regulating mould clamping forces
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76013—Force
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/76224—Closure or clamping unit
    • B29C2945/76234—Closure or clamping unit tie-bars
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76384—Holding, dwelling
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76391—Mould clamping, compression of the cavity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76862—Holding, dwelling
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76869—Mould clamping, compression of the cavity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76939—Using stored or historical data sets
    • B29C2945/76943—Using stored or historical data sets compare with thresholds
    • 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
    • B29C45/641—Clamping devices using means for straddling or interconnecting the mould halves, e.g. jaws, straps, latches

Abstract

The invention provides a method for setting a clamping force of an injection mold and a clamping force setting apparatus. The method comprises the steps of closing a metal die according to a set clamping force, injecting melted resin inside the metal die through an injection mechanism, setting a required minimum clamping force required for the metal die during a closed state, and calculating maximum increase of clamping force of the mold, which is the difference between the generated clamping force of the injection mold when the injection mold closes and a maximum clamping force of the injection mold during the injection molding process. Then, a transition point from a region of maximum increase of the clamping force of the injection mold is determined, and the predetermined clamping force of the injection mold is reduced to another region in which the clamping force is increased to a higher rate. The immediate transition of clamping force from one state to another state is carried out, for determining the required minimum clamping force of injection mold in which the injection mold does not open.

Description

The method of setting mold clamping force of injection moulding machine and setting mold clamping force device
Technical field
The present invention relates in injection moulding machine, according to obtaining the method for setting mold clamping force of suitable mold clamping force and the setting mold clamping force device of distortion flash not occurring and does not produce metal pattern to the resin pressure produced during injecting resin in metal pattern.
Background technology
In the injection molded cycle, close metal pattern by mold closing operation, and then produced the mold clamping force that presets by matched moulds operation after, injecting molten resin in metal pattern.To in metal pattern during injecting molten resin, when the insufficient pressure that mold clamping force produces relative to molten resin, metal pattern is had to open and the possibility of flash occurs.On the other hand, when mold clamping force is excessive, although do not worry flash occurs, cause ventilation poor, quality reduces, or on metal pattern, applies the mold clamping force of more than necessity, the service life reduction of metal pattern, the problems such as energy ezpenditure increase.Therefore, for preventing the generation of flash by making mold clamping force become the minimal value do not opened of metal pattern when injecting, and state that ventilation easily occurs can be become or do not apply on metal pattern necessary more than burden, it is desirable to obtain minimal mold clamping force that such metal pattern do not open and set.
As an example of the prior art of setting mold clamping force, in Japanese Unexamined Patent Publication 2008-6651 publication, disclose the technology obtaining the minimum mold clamping force that apply on metal pattern in the process making mold clamping force slowly change according to the change of the mold clamping force detected.But, in the art, needed to attempt before the permissible value (value according to the die sinking amount that can allow is tried to achieve) whether the change becoming mold clamping force is large, exist and cannot obtain the such problem of suitable mold clamping force expeditiously.
In addition, as another example of the prior art of setting mold clamping force, in Japanese Unexamined Patent Publication 8-252849 publication, the technology obtaining minimum mold clamping force according to the coefficient of injection pressure, projected area, safety coefficient etc. is disclosed.But, need the coefficient obtaining projected area, safety coefficient etc. in the art.Must analyze metal pattern drawing to obtain projected area, very loaded down with trivial details, in addition, safety coefficient is generally empirical value, is worth very difficulty accurately so obtain.Therefore, be difficult to obtain minimum mold clamping force accurately in the art.
Summary of the invention
Therefore, the object of this invention is to provide a kind of method of setting mold clamping force and setting mold clamping force device of injection moulding machine, by obtaining the minimal setting mold clamping force of necessity that metal pattern is not opened, can prevent from opening due to metal pattern and the flash occurred, in addition, improve quality by being shaped under the state easily ventilation occurring, or necessary above burden is not applied to metal pattern, the life-span of metal pattern can be shortened necessarily.
In the method for setting mold clamping force of injection moulding machine of the present invention, this injection moulding machine cuts out metal pattern according to setting mold clamping force by clamping and produces mold clamping force, by injection mechanism to injecting molten resin in above-mentioned metal pattern, this method of setting mold clamping force comprises following steps: inject with the setting mold clamping force of any different size, detect the mold clamping force produced when metal pattern cuts out, with in the maximum to the mold clamping force in the injection process produced during injecting molten resin in this metal pattern, calculate the difference of the maximum of the mold clamping force in the mold clamping force and injection process produced when above-mentioned metal pattern cuts out, the i.e. maximum recruitment of mold clamping force, extract the setting mold clamping force that the different and metal pattern of the maximum recruitment of the plural above-mentioned mold clamping force calculated is not opened, the plural setting mold clamping force gone out according to said extracted and the combination of the maximum recruitment of above-mentioned mold clamping force, obtain the relational expression of the maximum recruitment of mold clamping force representing corresponding with setting mold clamping force, inject with the setting mold clamping force that the plural setting mold clamping force gone out than said extracted is little, calculate the maximum recruitment of above-mentioned mold clamping force, obtain the setting mold clamping force that the maximum recruitment of the above-mentioned mold clamping force calculated exceedes the moment of the fiducial value based on above-mentioned relation formula, and be the minimal mold clamping force of necessity that metal pattern is not opened the last setting mold clamping force of above-mentioned setting mold clamping force of trying to achieve.
The above-mentioned step extracting the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened comprises following steps: to change when injecting from large value to little value when making the size of setting mold clamping force, when the variable quantity of the maximum recruitment of mold clamping force is less than the first predetermined value, the setting mold clamping force before removing change.
The above-mentioned step extracting the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened comprises following steps: remove the setting mold clamping force when the maximum recruitment of above-mentioned mold clamping force is less than the second predetermined value.
Linear approximation can be applied to obtain above-mentioned relation formula.
Can preset or automatically determine according to mold clamping force measured value the threshold value used as in above-mentioned fiducial value.
When injecting with the setting mold clamping force of above-mentioned plural size different arbitrarily, can inject considering very sufficient setting mold clamping force from the projected area of maximum injection pressure and metal pattern, reduce this setting mold clamping force and calculate the maximum recruitment of mold clamping force in each injection process.
The setting mold clamping force that the maximum recruitment difference of above-mentioned mold clamping force and metal pattern are not opened, can be set mold clamping force as follows: carry out injecting and calculate the maximum recruitment of mold clamping force, setting mold clamping force formed products is certified products can be judged in the setting mold clamping force that the maximum recruitment of the mold clamping force that this calculates changes.
Can revise the minimal mold clamping force of above-mentioned necessity with the surplus preset.
In addition, the setting mold clamping force device of injection moulding machine of the present invention, has: matched moulds portion, and it is closed metal pattern according to setting mold clamping force and produces mold clamping force; Injection part, it is to injecting molten resin in above-mentioned metal pattern; Test section, it is injected to set mold clamping force arbitrarily, detect above-mentioned metal pattern close time produce mold clamping force and in the maximum to the mold clamping force in the injection process produced during injecting molten resin in above-mentioned metal pattern; The maximum recruitment calculating part of mold clamping force, it is according to the mold clamping force produced during above-mentioned metal pattern closedown and obtain the maximum recruitment of mold clamping force to the difference of the maximum of the mold clamping force in the injection process produced during injecting molten resin in above-mentioned metal pattern; Storage part, the mold clamping force produced when it makes above-mentioned metal pattern close and the maximum recruitment corresponding stored of above-mentioned mold clamping force; Extraction unit, it carries out the calculating of the maximum recruitment of above-mentioned mold clamping force according to the setting mold clamping force of plural different size, extracts the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened; Relational expression calculating part, the mold clamping force produced when it is closed according to the above-mentioned metal pattern that said extracted goes out and the combination of the maximum recruitment of above-mentioned mold clamping force, obtain the relational expression of the maximum recruitment of mold clamping force representing corresponding with setting mold clamping force; And mold clamping force test section, it is injected with the setting mold clamping force less than above-mentioned plural different setting mold clamping force, calculate the maximum recruitment of above-mentioned mold clamping force, obtain the setting mold clamping force that the maximum recruitment of this mold clamping force calculated exceedes the fiducial value based on above-mentioned relation formula.Further, be the minimal mold clamping force of necessity that metal pattern is not opened the last setting setting mold clamping force of the mold clamping force detected by above-mentioned mold clamping force test section.
Said extracted portion, to change when injecting from large value to little value when making the size of setting mold clamping force, can when the variable quantity of the maximum recruitment of mold clamping force is less than the first predetermined value, the setting mold clamping force before removing change.
Said extracted portion can remove the maximum recruitment of above-mentioned mold clamping force less than the second predetermined value when setting mold clamping force.
Linear approximation can be applied to obtain above-mentioned relation formula.
Can preset or automatically determine according to mold clamping force measured value the threshold value used as in above-mentioned fiducial value.
When injecting with the setting mold clamping force of above-mentioned plural size different arbitrarily, can inject considering very sufficient setting mold clamping force from the projected area of maximum injection pressure and metal pattern, reduce this setting mold clamping force and calculate the maximum recruitment of mold clamping force in each injection process.
The above-mentioned extraction unit extracting the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened, can select to set mold clamping force as follows: carry out injecting and calculate the maximum recruitment of mold clamping force, setting mold clamping force formed products is certified products can be judged in the setting mold clamping force that the maximum recruitment of the mold clamping force that this calculates changes.
Can revise the minimal mold clamping force of above-mentioned necessity with the surplus preset.
According to the present invention, method of setting mold clamping force and the setting mold clamping force device of injection moulding machine can be provided, wherein, by obtaining the minimal setting mold clamping force of necessity that metal pattern is not opened, can prevent from opening due to metal pattern and the flash occurred, in addition, improve quality by being shaped under the incidental state of ventilation, or necessary above burden is not applied to metal pattern thus the life-span of metal pattern can be shortened necessarily.
Accompanying drawing explanation
Fig. 1 is the curve map of the relation of the maximum recruitment of mold clamping force represented when setting mold clamping force and injection.
Fig. 2 is the curve map of the time variations representing mold clamping force.
Fig. 3 is the figure of the state of the metal pattern illustrated when setting mold clamping force and injection.
Fig. 4 is the chart of the variable quantity decision method that the maximum recruitment of mold clamping force is described.
Fig. 5 is the schematic block diagram of injection moulding machine.
Fig. 6 A and Fig. 6 B represents the flow chart using linear approximation formula to ask the algorithm of the process of suitable mold clamping force.
Fig. 7 is the curve map that the mold clamping force asking suitable based on the intersection point of linear approximation formula is described.
Fig. 8 A-Fig. 8 C is the flow chart of the algorithm representing the process calculating suitable mold clamping force based on the intersection point of linear approximation formula.
Detailed description of the invention
When the insufficient pressure that mold clamping force produces relative to molten resin, metal pattern is opened and flash occurs.Fig. 1 represent from the projected area of maximum injection pressure and metal pattern for reference to and the very sufficient mold clamping force considered reduction mold clamping force until metal pattern open state time " setting mold clamping force " and represent that injection is defeated by by metal pattern time injection pressure and open time the relation of " the maximum recruitment of mold clamping force " of die sinking amount.Here, the maximum recruitment of so-called mold clamping force, as shown in Figure 2, represents the difference of the maximum of the mold clamping force (detected value) in setting mold clamping force and injection process.Following three state can be divided into consider when analyzing this relation.Fig. 3 represents the metal pattern state during injection under each state.If the mould of metal pattern is thick is L.
State 1: even if reduce setting mold clamping force, the maximum recruitment of mold clamping force during injection also indeclinable interval.In this interval, because mold clamping force is very sufficient relative to injection pressure, so metal pattern is compressed produce distortion like that.The maximum recruitment of mold clamping force that it is desirable to when injecting does not change.By mold clamping force, metal pattern is compressed with deflection δ 1, and mould is thick becomes L-δ 1, and between template, the distance of (between movable template and fixed form) also becomes L-δ 1.
State 2: if reduce setting mold clamping force, the interval that the maximum recruitment of mold clamping force when injecting increases.In this interval, because mold clamping force reduces compared with state 1, metal pattern is defeated by injection pressure and opens, so the distortion of the metal pattern produced in state 1 is slowly released.Therefore, when injecting, the maximum recruitment of mold clamping force during injection increases the d/d amount of distortion.Distortion is released a little, metal pattern be collapsed into the deflection δ 2 less than δ 1.Therefore, mould is thick becomes L-δ 2(0< δ 2< δ 1), the distance between template also becomes L-δ 2(0< δ 2< δ 1).
State 3: if reduce setting mold clamping force, the interval that the maximum recruitment of mold clamping force when injecting increases by a larger margin than state 2.In this interval, because be completely released when injecting in the distortion of the metal pattern of state 1, state 2 times generations, so mould is thick become L, in addition because produce die sinking amount δ 3, so the distance between template becomes L+ δ 3.
In addition, screw action is instigated in above-mentioned injection, whole operations of filling molten resin in the void space in metal pattern, also comprise the operation applying pressure complete filling molten resin in the void space in metal pattern to molten resin being called as pressurize operation.
Fig. 4 is the figure of the variable quantity decision method of the maximum recruitment that mold clamping force is described.Illustrate in this Fig. 4 and illustrate that the variable quantity of the maximum recruitment of differentiation mold clamping force transfers to the chart of the method for the point of state 3 from state 2.Transverse axis is setting mold clamping force (Fs), and the longitudinal axis is the maximum recruitment of mold clamping force (Fmax) in injection process.
For the branchpoint of detected state 2 and state 3, first ask the change of state 2 by linear approximation formula.For this reason, as shown in Figure 3, carry out the mensuration of carrying out any two points (A point and B point) place in the interval of the state 2 changed in the release that metal pattern distortion occurs, the maximum recruitment of mold clamping force, obtain the maximum recruitment Amax of mold clamping force that setting mold clamping force A is measured and the maximum recruitment Bmax of mold clamping force that setting mold clamping force B is measured.Now, when mold clamping force maximum recruitment Amax and Bmax is equal, because this point is positioned at state 1 interval, so reduce setting mold clamping force, again measure at the point becoming Amax<Bmax as shown in Figure 3.
Then, the linear approximation formula Fmax=a × Fs+b of the maximum recruitment of mold clamping force of expression state 2 can be calculated according to the value of this measured value Amax and Bmax.Because this linear approximation formula Fmax=a × Fs+b represents the increase of the mold clamping force that the release of being out of shape due to metal pattern in state 2 causes, so become for the maximum recruitment Cmax of mold clamping force of the setting mold clamping force C mensuration be in the interval of state 2 value meeting Cmax≤(a × C+b)+β.In formula, β, as the threshold value considering evaluated error or fluctuation, can carry out several injection, carry out the detection of the maximum recruitment of mold clamping force, using the difference of the maximum of detected value and minimum of a value as threshold value with setting mold clamping force identical arbitrarily.In addition, the method for threshold value is asked to be not limited to the method.
Then, state 3 is from the state that the release end of the distortion of metal pattern, metal pattern are opened, and the recruitment of mold clamping force significantly changes.Therefore, for the maximum recruitment Dmax of mold clamping force that the setting mold clamping force D in the interval of state 3 measures, Dmax> (a × D+b)+β is become.Namely, from state 2 to the method for discrimination of the branchpoint of state 3, the maximum recruitment of mold clamping force according to any two points in state 2 interval obtains linear approximation formula Fmax=a × Fs+b, the maximum recruitment Xmax of mold clamping force measured in the process that setting mold clamping force X is reduced becomes Xmax> (a × X+b)+β, be determined as the branchpoint to state 3.In addition, detect the setting mold clamping force of the point in front of this branchpoint, as the minimum mold clamping force that metal pattern is not opened.In addition, when not allowing small flash, also the minimum mold clamping force detected as surplus can be revised in the interval of state 2.In addition, also can not be undertaken by a setting mold clamping force from state 2 to the transfer of state 3, and be undertaken by the setting mold clamping force that continuous print two is different.In this case, be judged as when becoming Xmax> (a × X+b)+β continuously transferring to state 3 from state 2.
There is the setting mold clamping force of the state 2 of the release of metal pattern distortion, can by with the projected area of maximum injection pressure and metal pattern for reference and the mold clamping force of very sufficient state 1 considered under inject, reduce mold clamping force while calculate the maximum recruitment of mold clamping force in each injection process, the point changed from the maximum recruitment of mold clamping force is obtained.In addition, beyond the above-mentioned method of setting mold clamping force making mold clamping force change from state 1 to state 2 to obtain state 2, also the maximum recruitment of mold clamping force can be calculated under arbitrary setting mold clamping force, in the setting mold clamping force that the maximum recruitment of mold clamping force changes, mold clamping force when can be judged by the supervision of operator or video camera, whether qualified discrimination function that formed products is certified products is obtained as the setting mold clamping force of state 2.
In the injection moulding machine with mold clamping force checkout gear, by from the projected area of maximum injection pressure and metal pattern for reference to and the very sufficient mold clamping force considered trial inject, reduce mold clamping force while measure the maximum recruitment of mold clamping force in each injection process, the setting of mold clamping force of the present invention can be implemented.That is, by the setting arbitrary mold clamping force suitable with state 1, reduce mold clamping force and measure the maximum recruitment of mold clamping force in each injection process.In addition, in embodiments of the present invention, needs at least set at least two different mold clamping forces in state 2, obtain two maximum recruitments of mold clamping force, set at least one mold clamping force in state 3, obtain a maximum recruitment of mold clamping force.
As mentioned above, the maximum recruitment of so-called mold clamping force, represents the difference of the maximum of the mold clamping force in setting mold clamping force and injection process.According to size or the structure of metal pattern, setting mold clamping force is not necessarily consistent with the mold clamping force of the reality applied on metal pattern, so in embodiments of the present invention, can according to after matched moulds and also injection start before the difference of the maximum of mold clamping force that detects in the mold clamping force that detects and injection process, measure the maximum recruitment of mold clamping force accurately.In addition, the point (point that the maximum recruitment of mold clamping force significantly changes) that the maximum recruitment of mold clamping force in injection process shifts from state 2 to state 3 can be detected, obtain and put at this minimal setting mold clamping force of necessity that previous mold clamping force do not open as metal pattern.
In addition, as other embodiment, obtain linear approximation formula respectively 3 times in state 2 and state, according to the intersection point of these linear approximation formulas, the minimal setting mold clamping force of necessity that metal pattern is not opened can be obtained.
Fig. 5 is the schematic block diagram of injection moulding machine.The injection moulding machine that Fig. 5 represents, is configured to use method of setting mold clamping force of the present invention to set the injection moulding machine of mold clamping force.Injection moulding machine M (not shown) on chassis has matched moulds portion Mc and injection part Mi.Injection part Mi heating and melting resin material (particle), to the resin of empty this melting of intracavitary administration of metal pattern 40.Matched moulds portion Mc mainly carries out metal pattern 40(40a, 40b) opening and closing.
First injection part Mi is described.At the tip of injection cylinder 1, nozzle 2 is installed, in this injection cylinder 1, is inserted through screw rod 3.This screw rod 3 is set using the resin pressure sensor 5 of the force cell detecting resin pressure according to applied pressure on screw rod 3 etc.Servo CPU 15 is inputted after the output signal of this resin pressure sensor is transformed to data signal by A/D converter 16.
By screw rod rotation servomotor M2, by the transmission mechanism 6 be made up of belt wheel, band etc., screw rod 3 is rotated.In addition, screw rod 3, by screw rod forward-reverse motor M1, is driven by comprising belt wheel, band, ball screw/nut body etc. the transmission mechanism 7 that rotary motion is transformed to the mechanism of rectilinear motion, the direction of principal axis of screw rod 3 is moved.In addition, symbol P1 is position by detecting screw rod forward-reverse motor M1, speed, detect the axial position of screw rod 3, the location/velocity detector of speed, symbol P2 is position by detecting servomotor M2, speed, detects the position of rotation around axle of screw rod 3, the location/velocity detector of rotary speed.Symbol 4 is the hoppers supplying resin to injection cylinder 1.
Then matched moulds portion Mc is described.Matched moulds portion Mc has: make movable template 30 advance the movable template advance rollback servomotor M3 of rollback, rear pattern plate 31, for outstanding backing-out punch (ejector) the advance rollback servomotor M4 of the push rod (ejector pin) that makes to release formed products in metal pattern, movable template 30, connecting rod 32, fixed form 33, crosshead (cross head) 34, backing-out punch mechanism 35, elbow-bar mechanism 36.Rear pattern plate 31 is connected by multiple connecting rod 32 with fixed form 33, and movable template 30 is configured between rear pattern plate 31 and fixed form 33 in directed mode on these connecting rods 32.Movable template 30 is installed drawer at movable side metal pattern 40a, fixation side metal pattern 40b is installed on fixed form 33.
By making the crosshead 34 of installing on the ball screw axle 38 driven by movable template advance rollback servomotor M3 retreat, elbow-bar mechanism 36 action can be made.In this case, when make crosshead 34 advance (moving to the right direction in figure) time movable template 30 is advanced, carry out mold closing.In addition, produce the mold clamping force being multiplied by toggle link multiplying power gained in the propulsive force by movable template advance rollback servomotor M3, carry out matched moulds by this mold clamping force.
One of connecting rod 32 arranges mold clamping force sensor 41.Mold clamping force sensor 41 is the sensors of the distortion (mainly extending) detecting connecting rod 32.When matched moulds and mold clamping force accordingly tensile force is applied to connecting rod 32, with mold clamping force minute elongation pro rata.Therefore, detected the elongation of connecting rod 32 by mold clamping force sensor 41, the actual mold clamping force applied on metal pattern 40 can be known.As mold clamping force sensor 41, such as, deformation-sensor can be used.Detection signal from mold clamping force sensor 41 is sent to servo CPU 15 by A/D converter 27.The curve of mold clamping force (detected value) that Fig. 2 represents and the relation of time is obtained according to the detection signal from mold clamping force sensor 41.In addition, in servo CPU 15, calculate the maximum recruitment of mold clamping force of setting mold clamping force and the difference as the maximum clamping force in setting mold clamping force and injection process, the data obtained are stored in RAM 14.Here, the difference of the maximum clamping force in above-mentioned setting mold clamping force and injection process, the maximum recruitment of mold clamping force obtained as the differing from of maximum according to the mold clamping force detected in the mold clamping force detected after mold closing terminates and before injection starts and injection process.Or, the maximum recruitment of mold clamping force that also can obtain as the differing from of maximum according to the mold clamping force detected in the mold clamping force set and injection process.
Rear pattern plate 31 configures die-closed position adjustment motor M5.The rotating shaft of die-closed position adjustment motor M5 has installed driving gear (not shown).Around setting up the toothed power transmission member such as to be with on the gear (not shown) and above-mentioned driving gear of the connecting rod nut engaged with the threaded shank 37 of each connecting rod 32.Therefore, when driving die-closed position adjustment motor M5 to make above-mentioned driving gear rotate, above-mentioned connecting rod nut synchronous rotary is made.Die-closed position adjustment motor M5 can be made thus to rotate predetermined revolution to predetermined direction, rear pattern plate 31 is retreated predetermined distance.Die-closed position adjustment uses motor M5 as shown in the figure, and preferably servomotor has the position detector P5 detecting position of rotation.The detection signal of the position of rotation of the die-closed position adjustment motor M5 detected by position detector P5 is inputted to servo CPU 15.According to the present invention, by driving die-closed position adjustment motor M5, performing the process such as represented in the flow chart of Fig. 6 A-Fig. 6 B or the flow chart of Fig. 8 A-Fig. 8 C, optimum mold clamping force can be set thus.
The control device 100 of injection moulding machine M has: the CNC-CPU 20 as the microprocessor of Numerical Control, the PMC-CPU 17 as the microprocessor of programmable machine bed controller and the servo CPU 15 as the microprocessor of SERVO CONTROL, can carry out information transmission by selecting mutual input and output via bus 26 between each microprocessor.
Servo CPU 15 is connected to and is stored into line position loop, speed loop, the special ROM 13 of control program of the SERVO CONTROL of process of current loop and the RAM 14 in the interim storage for data.In addition, servo CPU 15 is with can by A/D(analog/digital) converter 16 mode that detects the pressure signal of the resin pressure sensor 5 of the various pressure such as the detection injection pressure that comfortable injection moulding machine base side arranges connects.Servo CPU 15 connects according to the instruction from servo CPU 15, drive the servo amplifier 11,12 of the screw rod forward-reverse servomotor M1 connected on injection shaft, the screw rod rotation servomotor M2 connected on screw rod rotating shaft, the output feedack of location/velocity detector P1, P2 of the upper installation of comfortable each servomotor M1, M2 is in the future to servo CPU 15.The position of rotation of each servomotor M1, M2, the feedback signal according to the position from location/velocity detector P1, P2 is calculated by servo CPU 15, in the memory register of each current location, be updated storage.
Connect servo amplifier 8,9 respectively driving on the servomotor M3 carrying out the matched moulds axle of the matched moulds of metal pattern and the backing-out punch advance rollback servomotor M4 taking out formed products from metal pattern.The output carrying out location/velocity detector P3, P4 of the upper installation of comfortable each servomotor M3, M4 is fed back to servo CPU 15.The position of rotation of each servomotor M3, M4, the feedback signal according to the position from location/velocity detector P3, P4 is calculated by servo CPU 15, in the memory register of each current location, be updated storage.
PMC-CPU 17 connects the RAM 19 of the ROM 18 of the sequencer program etc. storing the sequence action controlling injection moulding machine and the interim storage etc. for operational data, CNC-CPU 20 connects store overall control injection moulding machine automatic running program, the ROM 21 of various program such as control program realizing the method for setting mold clamping force associated with the present invention and the interim storage for operational data RAM 22.Formed data preservation RAM 23 is non-volatile memories, is the memory that the formed data storing molding condition and various setting value, parameter, the macro-variable etc. of closing injection molded operation is preserved.Display unit/MDI(manual data entry device) 25 to be connected with bus 26 by interface (I/F), the selection of function menu and the input operation etc. of various data can be carried out.Be provided with value key and the various function keys etc. of numeric data input.In addition, as display unit, also can use LCD(liquid crystal indicator), CRT, other display unit.
According to the structure of above injection moulding machine, PMC-CPU 17 controls the sequence action of injection moulding machine entirety, CNC-CPU 20 carries out the distribution of move to the servomotor of each axle according to the working procedure of ROM 21 and the molding condition etc. that stores in formed data preservation RAM 23, servo CPU 15 is according to the move distributed each axle and the feedback signal etc. by location/velocity detector P1, P2, P3, P4,53,54 positions detected and speed, combine digital servo processing, carries out drived control to servomotor M1, M2, M3, M4, M5.
The shaping actions using above-mentioned injection moulding machine M is described.When making movable template advance rollback servomotor M3 rotate to positive direction, ball screw axle 38 is rotated to positive direction, the crosshead 34 screwed togather with ball screw axle 38 being advanced (right direction in Fig. 4), when making elbow-bar mechanism 36 action, movable template 30 being advanced.
When the drawer at movable side metal pattern 40a installed in movable template 30 contacts with the fixation side metal pattern 40b installed on fixed form 33 (mold closing state), transfer to matched moulds operation.In matched moulds operation, by driving movable template advance rollback servomotor M3 to positive direction further, produce mold clamping force by elbow-bar mechanism 36 pairs of metal patterns 40.Then, by driving the screw rod forward-reverse motor M1 arranged on injection part Mi to advance on the direction of principal axis of screw rod 3, filling molten resin in the void space formed in metal pattern 40.When carrying out die sinking, when driving movable template advance rollback servomotor M3 to opposite direction, ball screw axle 38 is rotated in the opposite direction.Accompany therewith, crosshead 34 retreats, and elbow-bar mechanism 36 action on bending direction, movable template 30 retreats to the direction of rear pattern plate 31.At the end of die sinking operation, for the backing-out punch advance rollback servomotor M4 action making the push rod releasing formed products in drawer at movable side metal pattern 40a give prominence to.Thus, push rod (not shown) is given prominence to from the inner surface of drawer at movable side metal pattern 40a, and the formed products in drawer at movable side metal pattern 40a is given prominence to from drawer at movable side metal pattern 40a.
The following describes method of setting mold clamping force and the setting mold clamping force device of embodiments of the present invention.In embodiments of the present invention, in order to set the suitable mold clamping force of injection moulding machine, be used in the mold clamping force sensor 41 that connecting rod 32 is installed.Mold clamping force sensor 41 is mold clamping force in order to detect in forming process and the sensor arranged.Embodiments of the present invention obtain method and the device of suitable mold clamping force.
Fig. 6 A and Fig. 6 B represents the flow chart using linear approximation formula to obtain the algorithm of the process of suitable mold clamping force.Illustrate in accordance with each step below.
[step SA01] setting represents determines the maximum recruitment of mold clamping force and the initial value 1 of the index N of the quantity of forming period that will attempt.
[step SA02] is to set mold clamping force FsN(=Fs 1) perform 5 forming period, measure the maximum recruitment of mold clamping force in the injection process in each forming period.Then, in order to remove fluctuation or the error of measured value, using value that in 5 maximum recruitment FmaxN of mold clamping force, occurrence number is the highest, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN of mold clamping force) determines a maximum recruitment FmaxN(=Fmax 1 of mold clamping force).Then, the maximum recruitment FmaxN of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN.
In addition, the quantity of the forming period performed to sample here is 5, but be not limited to this quantity, when not having to fluctuate in measured value, the quantity of forming period can get 1, has the quantity of forming period when fluctuation also can get more than 6 on the contrary in measured value.Quantity for the forming period performed to sample be other the step of 5 too.
[step SA03] uses and deduct predetermined amount delta Fs(>0 from the setting mold clamping force FsN set among step SA02 or the step SA04 in last time) difference of gained upgrades this setting mold clamping force FsN+1.That is, FsN+1=FsN-Δ Fs.
In addition, because make the value of index N increase by 1 in the step SA06 between step SA04 and next step SA03, so when representing with FsN+1 the setting mold clamping force this time upgraded in step SA03, represent the setting mold clamping force set in the step SA04 of last time with FsN.
[step SA04] performs 5 forming period with this setting mold clamping force FsN+1, measures the maximum recruitment of mold clamping force in the injection process in each forming period.Then, in order to remove fluctuation or the error of measured value, being used in value that in 5 maximum recruitment FmaxN+1 of mold clamping force, occurrence number is the highest, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN+1 of mold clamping force) determines a maximum recruitment FmaxN+1 of mold clamping force.Then, the maximum recruitment FmaxN+1 of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN+1.
Transferring to step SA07 the FmaxN+1 that [step SA05] obtains in step SA04 before this and the relation of (or obtaining in step SA02) FmaxN to obtain in the step SA04 of last time are FmaxN+1>FmaxN+ α, transferring to step SA06 when not being FmaxN+1>FmaxN+ α.In addition, α (>0) is the value (the first predetermined value) of the evaluated error in enable state 1.
[step SA06] makes index N add 1 to upgrade (N=N+1), return step SA03.
Bright specifically, start the process represented in flow chart with index N=1, in step SA02, under setting mold clamping force Fs1, perform 5 forming period, the maximum recruitment Fmax 1 of mold clamping force determined as its result is stored together with setting mold clamping force Fs1.Certain value Δ Fs(>0 is deducted using from current setting mold clamping force Fs1 in step SA03) value of gained is as next setting mold clamping force Fs2(=Fs1-Δ Fs).In step SA04, under this setting mold clamping force Fs2, perform 5 forming period, the maximum recruitment Fmax 2 of mold clamping force determined as its result is stored together with setting mold clamping force Fs2.Then, the maximum recruitment Fmax of the more current mold clamping force the determined 2 and maximum recruitment Fmax 1 of mold clamping force that determined last time in step SA05.Result relatively, then transfers to step SA06 if not Fmax 2>Fmax 1+ α (judged result of step SA05: no), more New Set N(N=2), return step SA03.Then, in next step SA04, under setting mold clamping force Fs3, perform 5 forming period, the maximum recruitment Fmax 3 of mold clamping force determined as its result is stored together with setting mold clamping force Fs3.Then, the maximum recruitment Fmax of the more current mold clamping force the determined 3 and maximum recruitment Fmax 2 of mold clamping force that determined last time in step SA05.Result relatively, then transfers to step SA06 if not Fmax 3>Fmax2+ α (judged result of step SA05: no), more New Set N(N=3), return step SA03.Like this, before the judged result of step SA05 becomes "Yes", continue the process of step SA03, step SA04, step SA05, step SA06, step SA03.
[step SA07] makes index N add 1 to upgrade (N=N+1), transfer to step SA08.
[step SA08] deducts predetermined value Δ Fs(>0 using in setting mold clamping force FsN when performing 5 forming period from last time) value of gained setting mold clamping force FsN+1(FsN+1=FsN-Δ Fs when performing 5 forming period as this).
[step SA09] performs 5 forming period with this setting mold clamping force FsN+1, measures the maximum recruitment of mold clamping force in the injection process in each forming period.Then, in order to remove fluctuation or the error of measured value, being used in value that in 5 maximum recruitment FmaxN+1 of mold clamping force, occurrence number is the highest, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN+1 of mold clamping force) determines a maximum recruitment FmaxN+1 of mold clamping force.Then, the maximum recruitment FmaxN+1 of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN+1.
[step SA10] be used in before step SA04 in the setting mold clamping force FsN that stores and the maximum recruitment FmaxN of mold clamping force and the setting mold clamping force FsN+1 stored in step the SA09 before and maximum recruitment FmaxN+1 of mold clamping force ask linear approximation formula Fmax=a × Fs+b.
In addition, because make the value of index N increase by 1 in the step SA07 between step SA04 and step SA09, so when representing the maximum recruitment of the setting mold clamping force, the mold clamping force that store in step SA09 with FsN+1, FmaxN+1, represent the setting mold clamping force, the maximum recruitment of mold clamping force that store in step SA04 with FsN, FmaxN.
[step SA11] makes index N add 1 to upgrade (N=N+1), transfer to step SA12.
[step SA12] deducts predetermined value Δ Fs(>0 using in setting mold clamping force FsN when performing 5 forming period from last time) value of gained setting mold clamping force FsN+1(FsN+1=FsN-Δ Fs when performing 1 forming period as this).
[step SA13] performs 1 forming period with this setting mold clamping force FsN+1, measures the maximum recruitment of mold clamping force in the injection process in this forming period.Then, maximum for the mold clamping force of this measurement recruitment FmaxN+1 is stored together with above-mentioned setting mold clamping force FsN+1.
[step SA14] when try to achieve from the linear approximation formula of trying to achieve in step SA10, the mold clamping force maximum recruitment a × FsN+1+b corresponding with above-mentioned setting mold clamping force FsN+1 and the relation of mold clamping force maximum recruitment FmaxN+1 measured in previous step SA13 return step SA11 when being FmaxN+1≤(a × FsN+1+b)+β, transfers to step SA15 when not being FmaxN+1≤(a × FsN+1+b)+β.
Here, when not being FmaxN+1≤(a × FsN+1+b)+β, (judged result of step SA14: no) expression is shifted from state 2 to state 3.Use the transfer that a measured value (performing 1 forming period) judges from state 2 to state 3 in this embodiment, but also can judge by repeatedly measuring equally with step SA02, SA04, SA09.Or setting mold clamping force also can be made to change, be judged as transferring to state 3 from state 2 when meeting the formula of (i.e. "Yes") step SA14 more than double.
In addition, the value of above-mentioned β, can obtain according to the fluctuation of measured value or evaluated error and linear approximation formula in step SA10 simultaneously, also can according to the machine error of injection moulding machine in advance as setting parameter.
[step SA15] is using setting mold clamping force FsN(=FsN+1+ Δ Fs previous for the setting mold clamping force FsN+1 in the forming period performed in step SA13 before) the minimal mold clamping force of necessity do not opened as metal pattern, be set as setting mold clamping force, terminate this process.That is, the point (the maximum recruitment of mold clamping force changes point greatly) that the maximum recruitment detecting the mold clamping force in injection moulding process shifts from state 2 to state 3, obtains the minimal mold clamping force of necessity that the mold clamping force just before this point is not opened as metal pattern.
The intersection point that the following describes based on linear approximation formula asks the embodiments of the present invention of suitable mold clamping force.Fig. 7 is the figure that the intersection point illustrating based on linear approximation formula asks suitable mold clamping force.In the above-described embodiment at state 2(with reference to Fig. 4) under ask linear approximation formula, but ask linear approximation formula Fmax=a × Fs+b, Hmax=c × Fs+d respectively 3 times in state 2 and state in the present embodiment.Suitable mold clamping force can set based on the intersection point of linear approximation formula Fmax=a × Fs+b and Hmax=c × Fs+d.
Fig. 8 A-Fig. 8 C is the flow chart of the algorithm representing the process calculating suitable mold clamping force based on the intersection point of linear approximation formula.Illustrate in accordance with each step below.
[step SB01] setting is expressed as determines the maximum recruitment of mold clamping force and the initial value 1 of the index N of the number of forming period that will attempt.
[step SB02] is to set mold clamping force FsN(=Fs 1) perform 5 forming period, measure the maximum recruitment of mold clamping force in the injection process in each forming period.Then, for removing fluctuation or the error of measured value, using occurrence number peak in 5 maximum recruitment FmaxN of mold clamping force, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN of mold clamping force) determines a maximum recruitment FmaxN(=Fmax 1 of mold clamping force).Then, the maximum recruitment FmaxN of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN.
In addition, be set to here and sample and the number of the forming period of execution is 5, but be not limited to this number, when not having to fluctuate in measured value, the number of forming period can get 1, has the number of forming period when fluctuation also can get more than 6 on the contrary in measured value.The number of forming period performed for being set to sampling be other steps of 5 too.
[step SB03] uses and deduct predetermined amount delta Fs(>0 from the setting mold clamping force FsN set among step SB02 or the step SB04 in last time) value of gained upgrades this setting mold clamping force FsN+1.I.e. FsN+1=FsN-Δ Fs.
In addition, because make the value of index N increase by 1 in the step SB06 between step SB04 and next step SB03, so when representing with FsN+1 the setting mold clamping force this time upgraded in step SB03, represent the setting mold clamping force set in the step SB04 of last time with FsN.
[step SB04] performs 5 forming period with this setting mold clamping force FsN+1, measures the maximum recruitment of mold clamping force in the injection process in each forming period.Then, for removing the fluctuation of measured value or error, being used in value that in 5 maximum recruitment FmaxN+1 of mold clamping force, occurrence number is the highest, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN+1 of mold clamping force) determines a maximum recruitment FmaxN+1 of mold clamping force.Then, the maximum recruitment FmaxN+1 of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN+1.
Transferring to step SB07 the FmaxN+1 that [step SB05] obtains in step SB04 before this and the relation of (or obtaining in step SB02) FmaxN to obtain in the step SB04 of last time are FmaxN+1>FmaxN+ α, transferring to step SB06 when not being FmaxN+1>FmaxN+ α.In addition, α (>0) is the value (the first predetermined value) of the evaluated error in enable state 1.
[step SB06] makes index N add 1 to upgrade (N=N+1), return step SB03.
Bright specifically, start the process represented in flow chart with index N=1, in step SB02, under setting mold clamping force Fs1, perform 5 forming period, the maximum recruitment Fmax 1 of mold clamping force determined as its result is stored together with setting mold clamping force Fs1.In step SB03, deduct certain value Δ Fs(>0 using from current setting mold clamping force Fs 1) value of gained is as next setting mold clamping force Fs2(=Fs1-Δ Fs).In step SB04, under this setting mold clamping force Fs2, perform 5 forming period, the maximum recruitment Fmax 2 of mold clamping force determined as its result is stored together with setting mold clamping force Fs2.Then, the maximum recruitment Fmax of the more current mold clamping force the determined 2 and maximum recruitment Fmax 1 of mold clamping force that determined last time in step SB05.Result relatively, then transfers to step SB06 if not Fmax 2>Fmax 1+ α (judged result of step SB05: no), more New Set N(N=2), return step SB03.Then in next step SB04, perform 5 forming period 3 times at setting mold clamping force Fs, the maximum recruitment Fmax 3 of mold clamping force determined as its result is stored together with setting mold clamping force Fs 3.Then, the maximum recruitment Fmax of the more current mold clamping force the determined 3 and maximum recruitment Fmax 2 of mold clamping force that determined last time in step SB05.Result relatively, then transfers to step SB06 if not Fmax 3>Fmax 2+ α (judged result of step SB05: no), more New Set N(N=3), return step SB03.Like this, before the judged result of step SB05 becomes "Yes", continue the process of step SB03, step SB04, step SB05, step SB06, step SB03.
[step SB07] makes index N add 1 to upgrade (N=N+1), transfer to step SB08.
[step SB08] deducts predetermined value Δ Fs(>0 using in setting mold clamping force FsN when performing 5 forming period from last time) value of gained setting mold clamping force FsN+1(FsN+1=FsN-Δ Fs when performing 5 forming period as this).
[step SB09] performs 5 forming period with this setting mold clamping force FsN+1, measures the maximum recruitment of mold clamping force in the injection process in each forming period.Then, for removing the fluctuation of measured value or error, being used in value that in 5 maximum recruitment FmaxN+1 of mold clamping force, occurrence number is the highest, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN+1 of mold clamping force) determines a maximum recruitment FmaxN+1 of mold clamping force.Then, the maximum recruitment FmaxN+1 of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN+1.
[step SB10] be used in before step SB04 in the setting mold clamping force FsN that stores and the maximum recruitment FmaxN of mold clamping force and the setting mold clamping force FsN+1 stored in step the SB09 before and maximum recruitment FmaxN+1 of mold clamping force ask linear approximation formula Fmax=a × Fs+b.
In addition, because the step SB07 between step SB04 and step SB09 makes the value of index N increase by 1, so when representing the maximum recruitment of the setting mold clamping force, the mold clamping force that store in step SB09 with FsN+1, FmaxN+1, represent the setting mold clamping force, the maximum recruitment of mold clamping force that store in step SB04 with FsN, FmaxN.
[step SB11] makes index N add 1 to upgrade (N=N+1), transfer to step SB 12.
[step SB12] deducts predetermined value Δ Fs(>0 using in setting mold clamping force FsN when performing 5 forming period from last time) value of gained setting mold clamping force FsN+1(FsN+1=FsN-Δ Fs when performing 5 forming period as this).
[step SB13] performs 5 forming period with this setting mold clamping force FsN+1, measures the maximum recruitment of mold clamping force in the injection process in each forming period.Then, for removing the fluctuation of measured value or error, being used in value that in 5 maximum recruitment FmaxN+1 of mold clamping force, occurrence number is the highest, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN+1 of mold clamping force) determines a maximum recruitment FmaxN+1 of mold clamping force.Then, the maximum recruitment FmaxN+1 of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN+1.
[step SB14] when try to achieve according to the linear approximation formula of trying to achieve in step SB10, the mold clamping force maximum recruitment a × FsN+1+b corresponding with above-mentioned setting mold clamping force FsN+1 and the relation of mold clamping force maximum recruitment FmaxN+1 measured in previous step SB13 return step SB11 when being FmaxN+1≤(a × FsN+1+b)+β, transfers to step SB15 when not being FmaxN+1≤(a × FsN+1+b)+β.
At this, when not being FmaxN+1≤(a × FsN+1+b)+β, (judged result of step SB14: no) expression is shifted from state 2 to state 3.Use the transfer that a measured value (performing 1 forming period) judges from state 2 to state 3 in this embodiment, but also can judge by repeatedly measuring equally with step SB02, SB04, SB09.Or setting mold clamping force also can be made to change, be judged as transferring to state 3 from state 2 when meeting formula (i.e. the "Yes") of step SB14 more than double.
In addition, the value of above-mentioned β, can obtain according to the fluctuation of measured value or evaluated error and linear approximation formula in step SB10 simultaneously, also can according to the machine error of injection moulding machine in advance as setting parameter.
[step SB15] makes index N add 1 to upgrade (N=N+1), transfer to step SB16.
[step SB16] deducts predetermined value Δ Fs(>0 using in setting mold clamping force FsN when performing 5 forming period from last time) value of gained setting mold clamping force FsN+1(FsN+1=FsN-Δ Fs when performing 5 forming period as this).
[step SB17] performs 5 forming period with this setting mold clamping force FsN+1, measures the maximum recruitment of mold clamping force in the injection process in each forming period.Then, for removing the fluctuation of measured value or error, being used in value that in 5 maximum recruitment FmaxN+1 of mold clamping force, occurrence number is the highest, namely frequently value (or intermediate value etc. of these 5 maximum recruitment FmaxN+1 of mold clamping force) determines a maximum recruitment FmaxN+1 of mold clamping force.Then, the maximum recruitment FmaxN+1 of this mold clamping force determined is stored together with above-mentioned setting mold clamping force FsN+1.
[step SB18] be used in before step SB13 in the setting mold clamping force FsN that stores and the maximum recruitment FmaxN of mold clamping force and the setting mold clamping force FsN+1 stored in step the SB17 before and maximum recruitment FmaxN+1 of mold clamping force ask linear approximation formula Hmax=c × Fs+d.
In addition, because make the value of index N increase by 1 in the step SB15 between step SB13 and step SB17, so when representing the maximum recruitment of the setting mold clamping force, the mold clamping force that store in step SB17 with FsN+1, FmaxN+1, represent the setting mold clamping force, the maximum recruitment of mold clamping force that store in step SB13 with FsN, FmaxN.
[step SB19] is based on the linear approximation formula Fmax tried to achieve in step SB10 and the setting mold clamping force of the intersection point of linear approximation formula Hmax of trying to achieve in step SB18, the minimal mold clamping force of the necessity asking metal pattern not open, be set as setting mold clamping force, terminate this process.
The process of the flow chart that the process of the flow chart that Fig. 6 A-Fig. 6 B represents and Fig. 8 A-Fig. 8 C represent is the process making mold clamping force from state 1 to state 2, then obtain the relational expression of state 2 to state 3 change substantially.As other embodiment of the present invention, also setting mold clamping force Fs can be made to change arbitrarily, the maximum recruitment of mold clamping force is measured 3 times in state 1, state 2, state, as stored in the process that represents in above-mentioned flow chart, store setting mold clamping force X and the maximum recruitment Xmax of mold clamping force, use the data that these store, such as, from the little side of setting mold clamping force X, obtain relational expression in accordance with the judgement order of above-mentioned flow chart successively.
Or, also can in display unit/MDI 25(with reference to Fig. 5) display frame in show the data of above-mentioned storage with chart, operator selects to be judged as two of state 2 suitable points, according to two the some calculation relational expressions selected.Two points that operator selects, such as, also can, based on the increment rate of the maximum recruitment of mold clamping force, select to judge that formed products is the data of the setting mold clamping force of certified products.In addition, also can consider from the projected area of maximum injection pressure and metal pattern, measure the maximum recruitment of mold clamping force from the setting mold clamping force corresponding to state 2.In addition, also the whether qualified whether qualified discrimination function judged forming product with camera etc. can be used, using the setting mold clamping force of mold clamping force when can be judged as that product is certified products as state 2, using the data of maximum for mold clamping force now recruitment as asking the data of relational expression to use.Or, also in the indeclinable situation of the maximum recruitment of mold clamping force, the second predetermined value can be used as the benchmark compared in state 1, judge that setting mold clamping force is state 1 or state 2.

Claims (16)

1. a method of setting mold clamping force for injection moulding machine, is characterized in that,
This injection moulding machine cuts out metal pattern according to setting mold clamping force by clamping and produces mold clamping force, and by injection mechanism to injecting molten resin in above-mentioned metal pattern, above-mentioned method of setting mold clamping force comprises following steps:
Inject with the setting mold clamping force of any different size, detect the mold clamping force that produces when above-mentioned metal pattern cuts out and in the maximum to the mold clamping force in the injection process produced during injecting molten resin in this metal pattern, calculate difference, the maximum recruitment of mold clamping force of maximum of the mold clamping force in the mold clamping force and this injection process produced when above-mentioned metal pattern cuts out;
Extract the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened;
The plural setting mold clamping force gone out according to said extracted and the combination of the maximum recruitment of above-mentioned mold clamping force, obtain the relational expression of the maximum recruitment of above-mentioned mold clamping force representing corresponding with setting mold clamping force;
Inject with the setting mold clamping force that the plural different setting mold clamping force gone out than said extracted is little, calculate the maximum recruitment of above-mentioned mold clamping force;
Obtain the setting mold clamping force that the maximum recruitment of the above-mentioned mold clamping force calculated exceedes the moment of the fiducial value based on above-mentioned relation formula; And
Be the minimal mold clamping force of necessity that metal pattern is not opened the last setting mold clamping force of above-mentioned setting mold clamping force of trying to achieve.
2. the method for setting mold clamping force of injection moulding machine according to claim 1, is characterized in that,
The above-mentioned step extracting the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened comprises following steps: to change when injecting from large value to little value when making the size of setting mold clamping force, when the variable quantity of the maximum recruitment of mold clamping force is less than the first predetermined value, the setting mold clamping force before removing change.
3. the method for setting mold clamping force of injection moulding machine according to claim 1, is characterized in that,
The above-mentioned step extracting the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened comprises following steps: remove the setting mold clamping force when the maximum recruitment of above-mentioned mold clamping force is less than the second predetermined value.
4., according to the method for setting mold clamping force of the injection moulding machine in claims 1 to 3 described in any one, it is characterized in that,
Application linear approximation obtains above-mentioned relation formula.
5. the method for setting mold clamping force of injection moulding machine according to claim 1, is characterized in that,
Preset or automatically determine according to mold clamping force measured value the threshold value used as in above-mentioned fiducial value.
6. the method for setting mold clamping force of injection moulding machine according to claim 1, is characterized in that,
When injecting with the setting mold clamping force of above-mentioned plural size different arbitrarily, inject considering very sufficient setting mold clamping force from the projected area of maximum injection pressure and metal pattern, reduce this setting mold clamping force and calculate the maximum recruitment of mold clamping force in each injection process.
7. the method for setting mold clamping force of injection moulding machine according to claim 1, is characterized in that,
The setting mold clamping force that the maximum recruitment difference of above-mentioned mold clamping force and metal pattern are not opened, be set mold clamping force as follows: carry out injecting and calculate the maximum recruitment of mold clamping force, setting mold clamping force formed products is certified products can be judged in the setting mold clamping force that the maximum recruitment of this mold clamping force changes.
8. the method for setting mold clamping force of injection moulding machine according to claim 1, is characterized in that,
With the surplus preset, the minimal mold clamping force of above-mentioned necessity is revised.
9. a setting mold clamping force device for injection moulding machine, is characterized in that having:
Matched moulds portion, it is closed metal pattern according to setting mold clamping force and produces mold clamping force;
Injection part, it is to injecting molten resin in above-mentioned metal pattern;
Test section, it is injected to set mold clamping force arbitrarily, detect above-mentioned metal pattern close time produce mold clamping force and in the maximum to the mold clamping force in the injection process produced during injecting molten resin in above-mentioned metal pattern;
Mold clamping force recruitment calculating part, it is according to the mold clamping force produced during above-mentioned metal pattern closedown and obtain the maximum recruitment of mold clamping force to the difference of the maximum of the mold clamping force in the injection process produced during injecting molten resin in above-mentioned metal pattern;
Storage part, the mold clamping force produced when it makes above-mentioned metal pattern close and the maximum recruitment corresponding stored of above-mentioned mold clamping force;
Extraction unit, it carries out the calculating of the maximum recruitment of above-mentioned mold clamping force according to the setting mold clamping force of plural different size, extracts the setting mold clamping force that the different and metal pattern of the maximum recruitment of plural mold clamping force is not opened;
Relational expression calculating part, the mold clamping force produced when it is closed according to the above-mentioned metal pattern that said extracted goes out and the combination of the maximum recruitment of above-mentioned mold clamping force, obtain the relational expression of the maximum recruitment of mold clamping force representing corresponding with setting mold clamping force; And
Mold clamping force test section, it is injected with the setting mold clamping force less than above-mentioned plural different setting mold clamping force, calculates the maximum recruitment of above-mentioned mold clamping force, obtains the setting mold clamping force that the maximum recruitment of this mold clamping force exceedes the fiducial value based on above-mentioned relation formula,
Be the minimal mold clamping force of necessity that metal pattern is not opened the last setting setting mold clamping force of the mold clamping force detected by above-mentioned mold clamping force test section.
10. the setting mold clamping force device of injection moulding machine according to claim 9, is characterized in that,
Said extracted portion, to change when injecting from large value to little value when making the size of setting mold clamping force, when the variable quantity of the maximum recruitment of mold clamping force is less than the first predetermined value, and the setting mold clamping force before removing change.
The setting mold clamping force device of 11. injection moulding machines according to claim 9, is characterized in that,
Said extracted portion remove the maximum recruitment of above-mentioned mold clamping force less than the second predetermined value when setting mold clamping force.
The setting mold clamping force device of 12. injection moulding machines according to claim 9, is characterized in that,
Application linear approximation obtains above-mentioned relation formula.
The setting mold clamping force device of 13. injection moulding machines according to claim 9, is characterized in that,
Preset or automatically determine according to mold clamping force measured value the threshold value used as in above-mentioned fiducial value.
The setting mold clamping force device of 14. injection moulding machines according to claim 9, is characterized in that,
When injecting with the setting mold clamping force of above-mentioned plural size different arbitrarily, inject considering very sufficient setting mold clamping force from the projected area of maximum injection pressure and metal pattern, reduce this setting mold clamping force and calculate the maximum recruitment of mold clamping force in each injection process.
The setting mold clamping force device of 15. injection moulding machines according to claim 9, is characterized in that,
The above-mentioned unit obtaining the setting mold clamping force that the different and metal pattern of the maximum recruitment of mold clamping force is not opened, select to set mold clamping force as follows: carry out injecting and calculate the maximum recruitment of mold clamping force, setting mold clamping force formed products is certified products can be judged in the setting mold clamping force that the maximum recruitment of this mold clamping force changes.
The setting mold clamping force device of 16. injection moulding machines according to claim 9, is characterized in that, revises the minimal mold clamping force of above-mentioned necessity with the surplus preset.
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