CN103857516B - Pressurize operation control method in injection (mo(u)lding) machine - Google Patents
Pressurize operation control method in injection (mo(u)lding) machine Download PDFInfo
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- CN103857516B CN103857516B CN201180074008.7A CN201180074008A CN103857516B CN 103857516 B CN103857516 B CN 103857516B CN 201180074008 A CN201180074008 A CN 201180074008A CN 103857516 B CN103857516 B CN 103857516B
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- screw rod
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- pressurize operation
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- 238000002347 injection Methods 0.000 title claims abstract description 84
- 239000007924 injection Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000945 filler Substances 0.000 claims abstract description 22
- 238000012856 packing Methods 0.000 claims abstract description 17
- 230000006837 decompression Effects 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 230000014509 gene expression Effects 0.000 claims description 139
- 238000005259 measurement Methods 0.000 claims description 13
- 238000011156 evaluation Methods 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000002945 steepest descent method Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C2945/76006—Pressure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides the Stress control in a kind of pressurize operation carrying out accurately and performing after injection fillers operation, and can shape the pressurize operation control method in the injection (mo(u)lding) machine of the formed body of high-quality.Carrying out making screw rod to advance and filling the injection fillers operation of molten resin to the cavity injection of mould and make described screw retreats and carry out in the control method in the injection (mo(u)lding) machine of pressurize operation reduced pressure, after the injection fillers of described injection fillers operation completes, it is switched to described pressurize operation, as in a pressurize operation of the initial stage after being switched to this pressurize operation, by Stress control packing pressure reduced pressure and make described screw rod rapid backward, by make secondary pressurize operation that this post-decompression packing pressure reaches to carry out after a described pressurize operation at short notice set pressure in the way of carry out Decompression Controlling.
Description
Technical field
The present invention relates to after the cavity injection of mould is filled, at once carrying out molten resin
Compress control method in pressurize operation, relates to control accurately forming liquid crystal panel
Deng the thin materials such as the light guide plate that display floater is used time the injection (mo(u)lding) machine of residual stress that produces
In pressurize operation control method.
Background technology
In recent years, in the display of the liquid crystal of relatively miniaturization, employing makes light carry out face equably
Luminous light guide plate.When the sheet material that the wall thickness such as such light guide plate are relatively thin is formed or
Person in the precision form requiring high-precision shaping, in order to will to mould filling molten resin
The residual stress produced afterwards is got rid of, it is desirable to drastically reduce pressure to low-pressure state from high pressure conditions,
Such as, when reducing pressure slow, owing to remaining in the residual stress that the pressure in mould causes, shape
Know from experience and produce the uneven of warpage or wall thickness.And, when reducing pressure too fast, can produce and reach
The excessive excess of stroke after authorized pressure or fluctuation, thus exist and cause cob webbing or cast gate
The problem of blocking.
As the method associated with above-mentioned technology, Patent Document 1 discloses following injection
The filling work procedure control method of forming machine: in the filling work procedure carried out before pressurize operation, at spiral shell
Before bar and then after reaching the position of regulation, this screw rod is made to be back to setting position with setting speed,
Thus carried out before will carrying out V-P switching (from speed controlling to pressure controlled switching)
Take out pressure.And, Patent Document 2 discloses a kind of following technology: in injection moulding,
Make screw rod temporarily cease after high-voltage high-speed is injected or retreat, subtracting after high-voltage high-speed is injected
Voltage-controlled system.
[citation]
[patent documentation]
No. 3404652 publications of [patent documentation 1] Japanese Patent No.
[patent documentation 2] Japanese Laid-Open Patent Publication 59-165634 publication
Summary of the invention
[inventing problem to be solved]
The technology of patent documentation 1 is the technology making screw retreats in filling work procedure, the openest
The technology of pressure to be controlled in the pressurize operation carried out after filling work procedure, i.e. open desire
Control the technology of the residual stress produced in pressurize operation.And, in the skill of patent documentation 2
In art, reduce pressure before pressurize operation, be not intended to control in the same manner as patent documentation 1
The technology of the residual stress produced in pressurize operation.And, in patent documentation 2, make spiral shell
When bar retreats and reduces pressure, it is based only upon the shift position to screw rod (going-back position) and examines
The sensor surveyed or the measurement value of intervalometer carry out Decompression Controlling, therefore, it is difficult to carry out trickle
Decompression Controlling, it has to say the formed products being substantially difficult to obtain high-quality.
The present invention makes in view of above-mentioned problem, it is therefore intended that provide one to carry out accurately
Stress control in the pressurize operation performed after injection fillers operation, and high-quality can be shaped
Formed body injection (mo(u)lding) machine in pressurize operation control method.
[for solving the means of problem]
Pressurize operation control method in a kind of injection (mo(u)lding) machine, this injection (mo(u)lding) machine carries out making spiral shell
Bar advances and fills the injection fillers operation of molten resin to the cavity injection of mould and make described spiral shell
Bar retreats and carries out the pressurize operation reduced pressure, it is characterised in that
After the injection fillers of described injection fillers operation completes, it is switched to described pressurize operation,
As in a pressurize operation of the initial stage after being switched to this pressurize operation, pass through
Stress control makes a packing pressure decompression make described screw rod rapid backward, so that this is post-decompression
Packing pressure reaches the secondary pressurize work carried out after a described pressurize operation at short notice
The mode setting pressure of sequence carries out Decompression Controlling.
Pressurize operation control method in injection (mo(u)lding) machine is characterised by,
Control to carry out the forward travel of described screw rod with Negotiation speed in described injection fillers operation
And in described pressurize operation by the way of the setback that Stress control carries out described screw rod,
By carrying out V-P switching from described injection fillers operation to the switching of described pressurize operation.
Pressurize operation control method in injection (mo(u)lding) machine is characterised by,
In the pressurize operation being made screw retreats by described decompression, in a described pressurize
When the observed pressure of power is not up to described setting pressure, by the mathematical expression of following mathematical expression 1
Calculate retrogressing amplitude B of this screw rod when making described screw retreats reduce pressure, with by this number
Retrogressing amplitude B that the mathematical expression of formula 1 calculates makes described screw retreats,
On the other hand, in the pressurize operation being made screw retreats by described decompression, in institute
State the observed pressure of a packing pressure when reaching described setting pressure, by following mathematical expression 2
Mathematical expression carry out computing,
When being unsatisfactory for the mathematical expression of described mathematical expression 2,
Calculated when making described screw retreats reduce pressure by the mathematical expression of following mathematical expression 3
Retrogressing amplitude B of this screw rod, retrogressing amplitude B calculated with the mathematical expression by this mathematical expression 3
Make described screw retreats,
[mathematical expression 1]
B=Cb/0.9a
[mathematical expression 2]
A/B ＞ 0.98
[mathematical expression 3]
B=A/0.99
A: move to a pressurize operation and secondary from the V-P switching before a shot
The mobile range (mm) of the screw rod till when pressurize operation switches over
The retrogressing amplitude (mm) of C: the screw rod of the setting before a shot
Before the V-P switching pressure of a: the actual measurement when V-P before a shot switches and a shot
The differential pressure (MPa) of the observed pressure of pressurize operation
V-P switching pressure and the secondary pressurize operation of b: the actual measurement when V-P before a shot switches
In set pressure differential pressure (MPa).
Pressurize operation control method in injection (mo(u)lding) machine is characterised by,
When meeting the mathematical expression of described mathematical expression 2,
If frequency injection is k, described observed pressure reaches the setting pressure of described secondary pressurize operation
Time during power is t, and the retrogressing amplitude at time t screw retreats is X(t), at time t
Injection speed is V(t), the injection pressure at time t is P(t), the study of arbitrary decision
Coefficient is α, β, evaluation function f(t)=α V(t)+β P(t),
Use this evaluation function, by the mathematical expression of following mathematical expression 4 to becoming f(t) 0
Direction to each time injection calculate retrogressing amplitude X(t), the calculating injected each time based on this
The retrogressing amplitude of described screw rod is automatically adjusted by value,
[mathematical expression 4]
[invention effect]
According to the pressurize operation control method in the injection (mo(u)lding) machine of the present invention, from injection fillers
After operation switches to pressurize operation, in a pressurize operation of the initial stage of pressurize operation,
It is used in a packing pressure fast decompression of screw retreats, so that this packing pressure is in short-term
In reach the mode setting pressure of secondary pressurize operation and carry out Decompression Controlling, therefore by protecting
The such high-precision Stress control (residual stress produced in pressurize operation in pressure operation
Control), it is possible to manufacture high-quality formed products (shape the wall of thin molded article equably
Thick).
Additionally, use the observed pressure value of a packing pressure and described mathematical expression, carrying out screw rod
Decompression Controlling time, carry out self-teaching based on described observed pressure value, according to thus obtained
As a result, it is automatically adjusted in the way of making the retrogressing amplitude of screw rod become the retrogressing amplitude of optimum
(inching) and carry out Decompression Controlling.Thus, pressurize operation can carry out trickle pressure
Power controls, it is possible to increase the quality of the formed products of manufacture.
Accompanying drawing explanation
Fig. 1 is the brief configuration figure of the injecting unit representing injection (mo(u)lding) machine.
Fig. 2 is injection fillers operation and the pressurize operation of the injecting unit representing injection (mo(u)lding) machine
Coordinate diagram.
Fig. 3 is represent in a pressurize operation when retrogressing amplitude to screw rod is adjusted dynamic
The flow chart made.
Fig. 4 A is to represent in the case of the retrogressing amplitude of screw rod is too small, in order to increase this retrogressing width
Degree and be suitable for the mathematical expression of mathematical expression 1 to adjust the pressurize operation during retrogressing amplitude of screw rod
The explanatory diagram of action, the longitudinal axis represents the speed of screw rod, and transverse axis represents that the shift position of screw rod is made
For position, in a pressurize operation, the retrogressing width calculated with the mathematical expression by mathematical expression 1
Degree makes waveform during screw retreats be represented by solid line, after the screw rod of the setting before a shot
The amplitude of moving back makes waveform during screw retreats be illustrated by the broken lines.
Fig. 4 B is to represent in the case of the retrogressing amplitude of screw rod is too small, in order to increase this retrogressing width
Degree and be suitable for the mathematical expression of mathematical expression 1 to adjust the pressurize operation during retrogressing amplitude of screw rod
The explanatory diagram of action, the longitudinal axis represents pressure and the speed of screw rod, and horizontal axis representing time, with logical
Cross the waveform of pressure when the retrogressing amplitude that the mathematical expression of mathematical expression 1 calculates makes screw retreats than
The top side of time shaft is represented by solid line, makes with the retrogressing amplitude of the screw rod of the setting before a shot
The waveform of pressure during screw retreats is illustrated by the broken lines in side more top than time shaft.And, with logical
Cross the waveform of speed when the retrogressing amplitude that the mathematical expression of mathematical expression 1 calculates makes screw retreats than
Time shaft is represented by solid line on the lower, by the retrogressing width of the screw rod with the setting before a shot
The waveform spending speed when making screw retreats is being illustrated by the broken lines on the lower than time shaft.
Fig. 5 A is to represent in the case of the retrogressing amplitude of screw rod is excessive, in order to reduce this retrogressing width
Degree and be suitable for the mathematical expression of mathematical expression 3 to adjust the pressurize operation during retrogressing amplitude of screw rod
The explanatory diagram of action, the longitudinal axis represents the speed of screw rod, and transverse axis represents that the shift position of screw rod is made
For position, in a pressurize operation, the retrogressing width calculated with the mathematical expression by mathematical expression 1
Degree makes waveform during screw retreats be represented by solid line, after the screw rod of the setting before a shot
The amplitude of moving back makes waveform during screw retreats be illustrated by the broken lines.
Fig. 5 B is to represent in the case of the retrogressing amplitude of screw rod is excessive, in order to reduce this retrogressing width
Degree and be suitable for the mathematical expression of mathematical expression 3 to adjust the pressurize operation during retrogressing amplitude of screw rod
The explanatory diagram of action, the longitudinal axis represents pressure and the speed of screw rod, and horizontal axis representing time, with logical
Cross the waveform of pressure when the retrogressing amplitude that the mathematical expression of mathematical expression 3 calculates makes screw retreats than
The top side of time shaft is represented by solid line, makes with the retrogressing amplitude of the screw rod of the setting before a shot
The waveform of pressure during screw retreats is illustrated by the broken lines in side more top than time shaft.And, with logical
Cross the waveform of speed when the retrogressing amplitude that the mathematical expression of mathematical expression 3 calculates makes screw retreats than
Time shaft is represented by solid line on the lower, makes with the retrogressing amplitude of the screw rod of the setting before a shot
The waveform of speed during screw retreats is being illustrated by the broken lines on the lower than time shaft.
Fig. 6 is the coordinate diagram of the variable gradient representing learning coefficient.
Dynamic when Fig. 7 A is the mathematical expression that represents and be suitable for mathematical expression 1 to adjust the retrogressing amplitude of screw rod
Make coordinate diagram, the longitudinal axis represent the speed of screw rod as velocity determination, transverse axis represents the shifting of screw rod
Dynamic position is as position.
Dynamic when Fig. 7 B is the mathematical expression that represents and be suitable for mathematical expression 1 to adjust the retrogressing amplitude of screw rod
Make coordinate diagram, the longitudinal axis represent the pressure of screw rod as piezometry, transverse axis represents the shifting of screw rod
Dynamic position is as position.
Dynamic when Fig. 7 C is the mathematical expression that represents and be suitable for mathematical expression 1 to adjust the retrogressing amplitude of screw rod
The coordinate diagram made, the longitudinal axis represents that the speed of screw rod is as velocity determination, horizontal axis representing time.
Dynamic when Fig. 7 D is the mathematical expression that represents and be suitable for mathematical expression 1 to adjust the retrogressing amplitude of screw rod
The coordinate diagram made, the longitudinal axis represents that the pressure of screw rod is as piezometry, horizontal axis representing time.
Dynamic when Fig. 8 A is the mathematical expression that represents and be suitable for mathematical expression 3 to adjust the retrogressing amplitude of screw rod
Make coordinate diagram, the longitudinal axis represent the speed of screw rod as velocity determination, transverse axis represents the shifting of screw rod
Dynamic position is as position.
Dynamic when Fig. 8 B is the mathematical expression that represents and be suitable for mathematical expression 3 to adjust the retrogressing amplitude of screw rod
Make coordinate diagram, the longitudinal axis represent the pressure of screw rod as piezometry, transverse axis represents the shifting of screw rod
Dynamic position is as position.
Dynamic when Fig. 8 C is the mathematical expression that represents and be suitable for mathematical expression 3 to adjust the retrogressing amplitude of screw rod
The coordinate diagram made, the longitudinal axis represents that the speed of screw rod is as velocity determination, horizontal axis representing time.
Dynamic when Fig. 8 D is the mathematical expression that represents and be suitable for mathematical expression 3 to adjust the retrogressing amplitude of screw rod
The coordinate diagram made, the longitudinal axis represents that the pressure of screw rod is as piezometry, horizontal axis representing time.
Detailed description of the invention
Hereinafter, by Fig. 1～Fig. 8, embodiments of the present invention are described.Certainly, the present invention exists
Do not violate in the range of the purport of this invention, for the structure beyond illustrating in embodiments
The situation also being able to easily be suitable for is self-evident.
Fig. 1 is the front view representing the injecting unit 2 constituted in injection (mo(u)lding) machine 1, such as this
Shown in figure, constitute in injecting unit 2 and have: be put into granular raw material i.e. resin (granule)
Hopper 3；The heating cylinder 4 of the cartridge type of granular resin is supplied from this hopper 3；To heating cylinder
The molten resin supplied in 4 and utilize heat to carry out plastifying carries out the screw rod 5 measured；By metering
Injection that molten resin carries out injection fillers to the die cavity of mould, that be assemblied in heating cylinder 4 front end
Mouth 6；When carrying out the kneading etc. of molten resin in heating cylinder 4, make screw rod via Timing Belt 7
The 5 metering motor 8 as the source of driving rotated；At the molten resin that will measure from injection nozzle
When 6 front ends are injected, screw rod 5 is made to advance via Timing Belt 9, ball screw framework 10
As drive source injection motor 11；Detect the advance etc. along with screw rod 5 and extrude
The power (injection pressure) of molten resin is as the pressure transducer i.e. load cell 12 of counter-force；
The various controls of injection (mo(u)lding) machine 1 entirety such as the calculation process carrying out mathematical expression 1～4 described later
Control unit 13；Various numerical value, the described mathematical expressions etc. such as the measured value of storage injection (mo(u)lding) machine 1
Memory element 14 etc..
It follows that the pressurize operation of the injection (mo(u)lding) machine 1 of following description present embodiment.At figure
In 2, it is the longitudinal axis coordinate diagram that represents pressure and speed and horizontal axis representing time, as shown in the drawing,
Before making screw rod 5 so carried out to mould cavity injection fill molten resin injection fillers work
After sequence, carry out pressurize operation, in injection fillers operation, carried out the screw rod 5 of speed controlling
When injection fillers operation completes, machine carries out V-P switching at this moment, does not enters in pressurize operation
Line speed controls and carries out Stress control.It should be noted that in fig. 2, the waveform of pressure
Being represented by solid line, the waveform of speed is illustrated by the broken lines.
Pressurize operation carries out a pressurize operation in the initial stage switched from injection fillers operation,
After this pressurize operation, carry out secondary pressurize operation (formal pressurize operation), in order to
The packing pressure making a pressurize operation reaches the setting pressure of secondary pressurize operation at short notice
Power, control unit 13 makes screw rod rapid backward in a pressurize operation, carries out a packing pressure
Decompression Controlling.
Here, about a described pressurize operation, further illustrated by Fig. 3～Fig. 5.One
Retrogressing amplitude B of the screw rod 5 when being reduced pressure by the retrogressing of screw rod 5 in secondary pressurize operation
Adjustment carry out according to the sequence of movement shown in the flow chart of Fig. 3.By injection (mo(u)lding) machine 1
Operating, the observed pressure of a pressurize operation of actual measurement is not up to secondary pressurize work set in advance
(step 1) during the setting pressure of sequence, shifts to step 2, makes screw rod 5 retreat when reducing pressure
Retrogressing amplitude B of screw rod 5 entered according to the calculating of following mathematical expression 1 by control unit 13
OK.
[mathematical expression 1]
B=Cb/0.9a
The retrogressing amplitude (mm) of C: the screw rod of the setting before a shot
Before the V-P switching pressure of a: the actual measurement when V-P before a shot switches and a shot
The differential pressure (MPa) of the observed pressure of pressurize operation
V-P switching pressure and the secondary pressurize operation of b: the actual measurement when V-P before a shot switches
In set pressure differential pressure (MPa)
Further, retrogressing amplitude B calculated with the mathematical expression by mathematical expression 1 makes screw rod 5 retreat,
Thus a packing pressure of a pressurize operation is reduced pressure rapidly.It should be noted that about
Retrogressing width when retrogressing amplitude B calculated with the mathematical expression by mathematical expression 1 makes screw rod 5 retreat
The inching (retreat amplitude B too small in the case of) of degree B, based on Fig. 4 A, Fig. 4 B,
This further illustrates.In Fig. 4 A, the longitudinal axis represents the speed of screw rod 5, and transverse axis represents screw rod 5
Shift position is as position, in a pressurize operation, to be calculated by the mathematical expression of mathematical expression 1
Waveform when retrogressing amplitude B gone out makes screw rod 5 retreat is represented by solid line, before a shot
Waveform when retrogressing amplitude C of the screw rod 5 set makes screw rod 5 retreat is illustrated by the broken lines, and,
In Fig. 4 B, the longitudinal axis represents pressure and the speed of screw rod 5, and horizontal axis representing time, to pass through mathematics
The waveform of pressure when retrogressing amplitude B that the mathematical expression of formula 1 calculates makes screw rod 5 retreat than time
The top side of countershaft is represented by solid line, with retrogressing amplitude C of the screw rod 5 of the setting before a shot
The waveform of pressure when making screw rod 5 retreat is illustrated by the broken lines in side more top than time shaft, and,
Speed when retrogressing amplitude B calculated with the mathematical expression by mathematical expression 1 makes screw rod 5 retreat
Waveform is being represented by solid line on the lower than time shaft, with the screw rod 5 of the setting before a shot
The waveform of speed when retrogressing amplitude C makes screw rod 5 retreat than time shaft on the lower by dotted line table
Show.Further, as shown in Figure 4 B, based on the retrogressing amplitude calculated by the mathematical expression of mathematical expression 1,
The retrogressing amplitude of screw rod 5 is finely adjusted whole, thus enables that screw rod 5 is with suitable retrogressing width
Degree B action.
It addition, in step 1, the observed pressure in a pressurize operation of actual measurement reaches in advance
During the setting pressure of secondary pressurize operation set, shift to step 3, by control unit 13,
Carry out according to the calculating of following mathematical expression 2.
[mathematical expression 2]
A/B ＞ 0.98
A: move to a pressurize operation and secondary from the V-P switching before a shot
The mobile range (mm) of the screw rod till when pressurize operation switches over
Further, the (step 3) when being unsatisfactory for the mathematical expression of mathematical expression 2, shift to step 4,
Retrogressing amplitude B making screw rod 5 retreat the screw rod 5 when reducing pressure passes through control unit, according to
The calculating of following mathematical expression 3 is carried out.
[mathematical expression 3]
B=A/0.99
Further, retrogressing amplitude B calculated with the mathematical expression by mathematical expression 3 makes screw rod 5 retreat,
Thus a packing pressure of a pressurize operation is depressurized rapidly.It should be noted that about
Retrogressing width when retrogressing amplitude B calculated with the mathematical expression by mathematical expression 3 makes screw rod 5 retreat
The inching (retreat amplitude B excessive in the case of) of degree B, based on Fig. 5 A, Fig. 5 B,
This further illustrates.In Fig. 5 A, the longitudinal axis represents the speed of screw rod 5, and transverse axis represents screw rod 5
Shift position is as position, in a pressurize operation, to be calculated by the mathematical expression of mathematical expression 1
Waveform when retrogressing amplitude B gone out makes screw rod 5 retreat is represented by solid line, before a shot
Waveform when retrogressing amplitude C of the screw rod 5 set makes screw rod 5 retreat is illustrated by the broken lines, and,
In Fig. 5 B, the longitudinal axis represents pressure and the speed of screw rod 5, and horizontal axis representing time, to pass through mathematics
The waveform of pressure when retrogressing amplitude B that the mathematical expression of formula 3 calculates makes screw rod 5 retreat than time
The top side of countershaft is represented by solid line, with retrogressing amplitude C of the screw rod 5 of the setting before a shot
The waveform of pressure when making screw rod 5 retreat is illustrated by the broken lines in side more top than time shaft, and,
Speed when retrogressing amplitude B calculated with the mathematical expression by mathematical expression 3 makes screw rod 5 retreat
Waveform is being represented by solid line on the lower than time shaft, with the screw rod 5 of the setting before a shot
The waveform of speed when retrogressing amplitude C makes screw rod 5 retreat than time shaft on the lower by dotted line table
Show.Further, as shown in Figure 5 B, based on the retrogressing amplitude calculated by the mathematical expression of mathematical expression 3,
The retrogressing amplitude of screw rod 5 is finely adjusted whole, thus enables that screw rod 5 is with suitable retrogressing width
Degree B action.
It addition, in step 3, when meeting the mathematical expression of mathematical expression 2, shift to step 5.
(inching based on gradient method)
In steps of 5, even if having carried out the retrogressing amplitude of screw rod 5 in step 2 or step 4
Inching, when this inching is not optimum, sometimes also can after switching to Stress control
The pressure behavior that performance is unstable.As the inching unit for eliminating this problem, in order to ask
Go out local solution and use effective steepest descent method.Here, steepest descent method is by following formula
Represent.
[mathematical expression 4a]
K: frequency injection
T: observed pressure reaches the time during setting pressure of secondary pressurize operation
X(t): the retrogressing amplitude of screw retreats at time t
F(t): with the evaluation of estimate used in this specification, the adjustment amount of output retrogressing amplitude.
Here, prepare following function as evaluation function.
F(t)=α V(t)+β P(t)
V(t): the injection speed at time t
P(t): the injection pressure at time t
The learning coefficient of α, β: arbitrary decision
Further, above-mentioned evaluation function is used, to becoming f(t) direction of 0 will retreat amplitude
X(t) to when injection is updated each time, the formula of mathematical expression 4 is become.
[mathematical expression 4]
Now, learning coefficient α, β make constant variable as the coordinate diagram of Fig. 6, suppression approximation
Overfitting when local solution.
It should be noted that here, determine parameter according to following specification.
[mathematical expression 5]
During Δ V (t) ＜=Δ V1 ... α=αmin
ΔV1＜ Δ V (t) < Δ V2Time ...
ΔV2During ＜=Δ V (t) ... α=αmax
Δ P (t) ＜=Δ P1Time ... β=βmin
ΔP1＜ Δ P (t) ＜ Δ P2Time ...
ΔP2During ＜=Δ P (t) ... β=βmax
Further, above-mentioned evaluation function is used, by control unit, according to the mathematics of mathematical expression 4
Formula, to becoming f(t) direction of 0 calculates retrogressing amplitude X(t to injection each time), based on
This value of calculation injected each time adjusts the retrogressing amplitude of described screw rod 5 automatically.
It follows that about when amplitude B of retrogressing being finely adjusted whole by the mathematical expression of mathematical expression 1
An example of action, illustrated by Fig. 7.In Fig. 7 A, the longitudinal axis represents the speed of screw rod 5
As velocity determination, transverse axis represents that the shift position of screw rod 5 is as position, in Fig. 7 B, the longitudinal axis
The pressure of expression screw rod 5 is as piezometry, and transverse axis represents that the shift position of screw rod 5 is as position
Put, in Fig. 7 C, the longitudinal axis represent the speed of screw rod 5 as velocity determination, horizontal axis representing time,
In Fig. 7 D, the longitudinal axis represents that the pressure of screw rod 5 is as piezometry, horizontal axis representing time.At figure
In 7A～Fig. 7 D, the waveform of injection (1.00mm) is represented by solid line for the first time, second time injection
(2.70mm) waveform is illustrated by the broken lines, and the waveform of third time injection (3.38mm) is by single-point
Line represents.Further, the retrogressing amplitude of the screw rod 5 of injection is set to 1mm, with secondary for the first time
The goal pressure setting pressure suitable of pressurize operation is set to 10MPa, makes injection (mo(u)lding) machine 1 transport
Then form.So, according to Fig. 7 B, the position pressure at 1mm is about 66MPa,
Therefore in injection for the first time, miss the mark pressure.Therefore, in order to be adjusted to screw rod 5
Retrogressing amplitude is relatively big, and uses the mathematical expression (B=Cb/0.9a) of described mathematical expression 1.
Here, C=1.0mm, the V-P switching pressure of the actual measurement when V-P before a shot switches
For 105aMPa, the V-P switching of the actual measurement when V-P before a shot switches is pressed and once notes
The differential pressure (MPa) of the observed pressure of a pressurize operation before penetrating is 105MPa-66MPa=39
The setting pressure of bis-pressurize operations of MPa, a=39MPa, b=95MPa(105MPa-10MPa(
Power)), therefore, B=Cb/0.9a=(1.0 × 95)/(0.9 × 39) 2.70mm, thus,
Second time injection is with B=2.70mm, and goal pressure is set to 10MPa and forms.
Further, as a result of which it is, when B=2.70mm, pressure is about 20.7MPa, cannot
When reaching the 10MPa as goal pressure, in order to reach the 10MPa as goal pressure and again
The mathematical expression (B=Cb/0.9a) of secondary use mathematical expression 1, C=2.7mm, the V-P before a shot
The V-P switching pressure of actual measurement during switching is 105aMPa, as shown in Figure 7 B, in second time injection
The position pressure of 2.70mm be 20.7MPa, therefore, during V-P switching before a shot
Actual measurement V-P switching pressure and a shot before the differential pressure of observed pressure of a pressurize operation
(MPa) it is 105MPa-20.7MPa=84.3MPa, a=84.3MPa, b=95MPa(105MPa
The setting pressure of two pressurize operations of-10MPa()), therefore B=Cb/0.9a=(2.7 × 95)/
(0.9 × 84.3) 3.38mm, thus, third time injection is with B=3.38mm, goal pressure
10MPa shapes, and when B=3.38mm, result is, pressure becomes 12.2MPa, but
The pressure of this pressurize operation of 12.2MPa() miss the mark pressure (secondary pressurize operation
Setting pressure), after therefore carrying out employing the screw rod 5 of the mathematical expression of mathematical expression 1
Move back the inching of amplitude, convergence.
On the other hand, the pressure a pressurize operation reaches the setting pressure of secondary pressurize operation
Time, also as shown in the flow process of Fig. 3, shift to step 3 from step 1, single by controlling
Unit 13 is made whether to meet the judgement of the important document of the mathematical expression (A/B > 0.98) of mathematical expression 2,
When being unsatisfactory for this important document, carry out employing the retrogressing amplitude of the screw rod 5 of the mathematical expression of mathematical expression 3
Inching.About an example of action when carrying out this inching, say below by way of Fig. 8
Bright.
In Fig. 8 A, the longitudinal axis represent the speed of screw rod 5 as velocity determination, transverse axis represents screw rod 5
Shift position as position, in Fig. 8 B, the longitudinal axis represent the pressure of screw rod 5 as piezometry,
Transverse axis represent the shift position of screw rod 5 as position, in Fig. 8 C, the longitudinal axis represents the speed of screw rod 5
Spending as velocity determination, horizontal axis representing time, in Fig. 8 D, the longitudinal axis represents that the pressure of screw rod 5 is made
For piezometry, horizontal axis representing time.In Fig. 8 A～Fig. 8 D, injection (5.00mm) for the first time
Waveform represented by solid line, second time injection (4.05mm) waveform be illustrated by the broken lines, the 3rd
The waveform of secondary injection (3.57mm) is represented by single dotted broken line.Further, such as, if noting for the first time
The retrogressing amplitude of the screw rod penetrated is 5.00mm, the mesh suitable with the setting pressure of secondary pressurize operation
When mark pressure is set to 10MPa and forms, in order to make a packing pressure of a pressurize operation
Reaching the setting pressure of secondary pressurize operation, making retrogressing amplitude B is that 4.01mm reaches, but
It is in injection for the first time, B=5.00, A=3.97, therefore it is unsatisfactory for the mathematical expression of mathematical expression 2
The important document of (A/B > 0.98), therefore to carry out in the way of the retrogressing amplitude reduction of screw rod 5
Adjust, and use the mathematical expression (B=A/0.99) of described mathematical expression 3.
Further, when the mathematical expression (B=A/0.99) with mathematical expression 3, amplitude B=4.05mm is retreated,
Goal pressure be 10MPa carry out second time inject shaping time, the once guarantor of a pressurize operation
Pressure reaches retrogressing amplitude B when setting pressure of secondary pressurize operation becomes 3.53mm, therefore
Again calculate according to the mathematical expression (B=A/0.99) of mathematical expression 3.
As a result of which it is, become B=3.57mm, therefore in third time injection, with B=3.57mm,
Goal pressure is that 10MPa forms, and retrogressing amplitude B is 3.57mm, a pressurize operation
Packing pressure when reaching setting pressure (goal pressure) the i.e. 10MPa of secondary pressurize operation,
The inching of the retrogressing amplitude employing the screw rod 5 of the mathematical expression of mathematical expression 3 terminates.
[label declaration]
1 injection (mo(u)lding) machine
2 injecting units
3 hoppers
4 heating cylinders
5 screw rods
6 injection nozzle
7 Timing Belts
8 metering motor
9 Timing Belts
10 ball screw frameworks
11 injection motor
12 load cells
13 control units
14 memory element
Claims (2)
1. the pressurize operation control method in injection (mo(u)lding) machine, this injection (mo(u)lding) machine makes
Screw rod advances and fills the injection fillers operation of molten resin to the cavity injection of mould and make described
Screw retreats and carry out the pressurize operation reduced pressure, it is characterised in that
After the injection fillers of described injection fillers operation completes, it is switched to described pressurize operation,
As in a pressurize operation of the initial stage after being switched to this pressurize operation, pass through
Stress control makes a packing pressure decompression make described screw rod rapid backward, so that this is post-decompression
Packing pressure reaches the secondary pressurize work carried out after a described pressurize operation at short notice
The mode setting pressure of sequence carries out Decompression Controlling,
Control to carry out the forward travel of described screw rod with Negotiation speed in described injection fillers operation
And in described pressurize operation by the way of the setback that Stress control carries out described screw rod,
By spending control rapidly to the switching of described pressurize operation from described injection fillers operation to pressure
The switching that power controls,
In the pressurize operation being made screw retreats by described decompression, in a described pressurize
When the observed pressure of power is not up to described setting pressure, by the mathematical expression of following mathematical expression 1
Calculate retrogressing amplitude B of this screw rod when making described screw retreats reduce pressure, with by this number
Retrogressing amplitude B that the mathematical expression of formula 1 calculates makes described screw retreats,
On the other hand, in the pressurize operation being made screw retreats by described decompression, in institute
State the observed pressure of a packing pressure when reaching described setting pressure, by following mathematical expression 2
Mathematical expression carry out computing,
When being unsatisfactory for the mathematical expression of described mathematical expression 2,
Calculated when making described screw retreats reduce pressure by the mathematical expression of following mathematical expression 3
Retrogressing amplitude B of this screw rod, retrogressing amplitude B calculated with the mathematical expression by this mathematical expression 3
Make described screw retreats,
[mathematical expression 1]
B=Cb/0.9a
[mathematical expression 2]
A/B ＞ 0.98
[mathematical expression 3]
B=A/0.99
A: from moving to to pressure controlled switching from speed controlling before a shot
The mobile range (mm) of the screw rod till when secondary pressurize operation and secondary pressurize operation switch over
The retrogressing amplitude (mm) of C: the screw rod of the setting before a shot
A: before a shot from speed controlling to the switching pressure of actual measurement during pressure controlled switching
Differential pressure (MPa) with the observed pressure of a pressurize operation before a shot
B: before a shot from speed controlling to the switching pressure of actual measurement during pressure controlled switching
With the differential pressure (MPa) setting pressure in secondary pressurize operation.
Pressurize operation control method in injection (mo(u)lding) machine the most according to claim 1, its
It is characterised by,
When meeting the mathematical expression of described mathematical expression 2,
If frequency injection is k, described observed pressure reaches the setting pressure of described secondary pressurize operation
Time during power is t, and the retrogressing amplitude at time t screw retreats is X (t), at time t
Injection speed is V (t), injection pressure P (t) at time t, by following mathematical expression 5
The learning coefficient determined are α, β, evaluation function f (t)=α V (t)+β P (t),
Use this evaluation function, by the mathematical expression of following mathematical expression 4 to becoming f (t) 0
Direction to each time injection calculate retrogressing amplitude X (t), the calculating injected each time based on this
The retrogressing amplitude of described screw rod is automatically adjusted by value,
[mathematical expression 4]
[mathematical expression 5]
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2011/072822 WO2013051098A1 (en) | 2011-10-04 | 2011-10-04 | Method of controlling pressure-maintaining step for injection-molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103857516A CN103857516A (en) | 2014-06-11 |
| CN103857516B true CN103857516B (en) | 2016-08-17 |
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| CN201180074008.7A Expired - Fee Related CN103857516B (en) | 2011-10-04 | 2011-10-04 | Pressurize operation control method in injection (mo(u)lding) machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5815040B2 (en) |
| CN (1) | CN103857516B (en) |
| WO (1) | WO2013051098A1 (en) |
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| CN105922498B (en) * | 2016-05-11 | 2018-04-27 | 李爱冰 | A kind of injection molding process of glass light guide plate |
| JP6906926B2 (en) * | 2016-10-31 | 2021-07-21 | 住友重機械工業株式会社 | Injection molding machine |
| JP6797723B2 (en) * | 2017-03-07 | 2020-12-09 | 住友重機械工業株式会社 | Injection molding machine |
| CN107310118B (en) * | 2017-07-26 | 2020-04-10 | 华域视觉科技(上海)有限公司 | Switching method from speed control to pressure control in injection molding process and injection mold |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS634926A (en) * | 1986-06-26 | 1988-01-09 | Japan Steel Works Ltd:The | Control of injection molder |
| JP3366042B2 (en) * | 1993-03-25 | 2003-01-14 | 東洋機械金属株式会社 | Injection control method for servo motor driven injection molding machine and servo motor driven injection molding machine |
| JPH11309761A (en) * | 1998-04-30 | 1999-11-09 | Nippon Zeon Co Ltd | Manufacture of light guide plate |
| JP3337205B2 (en) * | 1999-09-10 | 2002-10-21 | 住友重機械工業株式会社 | Injection device and control method thereof |
| JP3579890B2 (en) * | 2001-02-28 | 2004-10-20 | 住友重機械工業株式会社 | Injection molding machine and control method thereof |
| JP3917459B2 (en) * | 2002-05-16 | 2007-05-23 | 住友重機械工業株式会社 | Control device and control method for injection molding machine |
| JP2005313409A (en) * | 2004-04-28 | 2005-11-10 | Japan Steel Works Ltd:The | Injection molding machine and hold pressure changeover control method thereof |
| JP4027380B2 (en) * | 2005-06-02 | 2007-12-26 | ファナック株式会社 | Control device for injection molding machine |
-
2011
- 2011-10-04 JP JP2013537304A patent/JP5815040B2/en active Active
- 2011-10-04 WO PCT/JP2011/072822 patent/WO2013051098A1/en active Application Filing
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| Publication number | Publication date |
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| WO2013051098A1 (en) | 2013-04-11 |
| JPWO2013051098A1 (en) | 2015-03-30 |
| CN103857516A (en) | 2014-06-11 |
| JP5815040B2 (en) | 2015-11-17 |
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