CN103568209A - Injection molding machine with resin supply quantity regulating part - Google Patents
Injection molding machine with resin supply quantity regulating part Download PDFInfo
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- CN103568209A CN103568209A CN201310316642.8A CN201310316642A CN103568209A CN 103568209 A CN103568209 A CN 103568209A CN 201310316642 A CN201310316642 A CN 201310316642A CN 103568209 A CN103568209 A CN 103568209A
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- screw rod
- resin
- value
- test section
- resistance
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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
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
- B29C45/1808—Feeding measured doses
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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
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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
- 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
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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
- 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
- B29C2945/7618—Injection unit
- B29C2945/76187—Injection unit screw
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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
- 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
- B29C2945/76351—Feeding
- B29C2945/76354—Feeding raw materials
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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
- 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
- B29C2945/76367—Metering
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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
- 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
- B29C2945/76494—Controlled parameter
- B29C2945/76585—Dimensions, e.g. thickness
- B29C2945/76591—Dimensions, e.g. thickness volume
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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
- 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
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76662—Injection unit hopper
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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
- 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
- B29C2945/76829—Feeding
- B29C2945/76832—Feeding raw materials
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
An injection molding machine with a resin supply quantity regulating part is provided. The resin supply quantity regulating part is adopted to detect a screw resistance of an injection screw in an axial direction, and resin supply quantity is controlled so as to enable the detected resistance to coincide with a specific value. Therefore, materials can be supplied by maintaining a reasonable lean supply condition.
Description
Technical field
The present invention relates to a kind of injection moulding machine, particularly relate to the injection moulding machine with resin quantity delivered adjusting portion.
Background technology
As the injection cylinder for to injection moulding machine, supply with the method for the particle of moulding material, generally use following methods, particle is stored in the feed hopper arranging with injection cylinder UNICOM, utilize the deadweight of the particle of this storage that particle is sent into injection cylinder.At this moment, the state of the resin supply port of injection cylinder is the state (filling state) that is full of particle.
On the other hand, for the supply of filling of this particle, known so-called hungry supply mode, makes the resin supply port of injection cylinder become rarefaction state thereby marginally supply with particle at every turn.For example, Unexamined Patent 5-318531 communique discloses a kind of technology, between the supply source of particle and injection cylinder, particle loader is set, and controls the feed speed of particle by increasing and decreasing the feeding speed of this particle loader.
When carrying out hunger while supplying with, estimate to have following effect, promote the gas producing in injection cylinder to discharge from resin supply port, or suppress to cause injection cylinder inner wall abrasion due near injection cylinder inwall resin supply port and resin material friction.But, when density state (starvation) change of the resin material of resin supply port, measure the resin plasticization quality change in operation, can produce bad impact to Forming Quality.Therefore,, while carrying out hunger supply, existing is the problem that constant state must carry out material supply in order to keep starvation.
JP 2002-248655 communique discloses a kind of technology, the moulding material test section that detects the moulding material in screw slot is set the supply unit of close screw rod, according to the testing result of this moulding material test section, control the quantity delivered of resin material, so that moulding material can 100% is full of screw slot.But there is following problem in this technology, need to be for detection of the special test section of the moulding material in screw slot.
JP 53-11957 communique discloses a kind of technology, detects the torque of the screw rod rotation of measuring operation, and the quantity delivered of adjusting raw material makes this detection torque consistent with a reference value.But there is following problem in this technology, sometimes because the kind starvation of resin material changes but the torque of screw rod rotation do not change, now cannot control starvation according to the torque of screw rod rotation.
Unexamined Patent 1-171830 communique discloses a kind of technology, and poor between the time of the actual measurement time while judging plasticization operation and predefined reference measurement controlled the material quantity delivered of material feeding apparatus according to this result of determination.But this technology exists following problem, because Measuring Time changes according to the size of screw rod rotary speed, therefore cannot correctly judge starvation.
Unexamined Patent 3-114813 communique discloses a kind of raw material feed device, and when it utilizes the raw material of colour switching object to carry out colour switching running, thereby switch resin channels offers feeder off and on by material resin off and on.In this raw material feed device, total rotation number of setting elapsed time or screw rod rotation is used as determining the judgment standard of the supply time started of colour switching resin.
Unexamined Patent 3-118132 communique discloses a kind of injection moulding machine, according to the metrical information of sensor that is provided in each portion of injection moulding machine judge with predefined a plurality of monitoring projects respectively corresponding each measurement data whether in allowed band, monitor.In this injection moulding machine, accumulation computing is from the screw rod rotation amount of rotation zero hour of screw rod, and the test item using this screw rod rotation amount as loadings, during measurement operation is used.
JP 2012-000962 communique discloses a kind of technology, detects the screw rod rotation amount in predetermined interval, in order to make this detected screw rod rotation amount become predetermined desired value, regulates the resin quantity delivered of resin supply unit.
JP 2001-347545 communique discloses a kind of technology, detect material hold-up in injection cylinder or with the physical quantity that the Density Distribution of position changes accordingly, according to this testing result, the material quantity delivered of weight feed portion is changed.
Summary of the invention
Therefore, the present invention proposes in view of above-mentioned prior art problem, its object be to provide a kind of need to be for detection of the special test section of the moulding material in screw slot, and can not be subject to measuring the big or small impact of rotary speed, can keep suitable starvation to carry out the injection moulding machine with resin quantity delivered adjusting portion of material supply.
Injection moulding machine of the present invention has injection cylinder, screw rod, in forward-reverse direction, drive the screw rod forward-reverse drive division of this screw rod, detect the power test section of the power that described screw rod is subject in the axial direction, to the resin material supply unit of supplying with resin material in described injection cylinder, and possess: screw rod resistance calculating part, its detected value according to described power test section calculates screw rod resistance; Resin quantity delivered adjusting portion, it,, along with described screw rod resistance becomes large, diminishes the resin quantity delivered of described resin material supply unit.
Described screw rod resistance calculating part calculates from decompression operation finishes the absolute value of detected value of the described power test section of any time of screw rod starting to advance, is used as screw rod resistance.
Described screw rod resistance calculating part calculates detected value from the test section of power described in decompression process and is carved into the advance absolute value of detected value of described power test section of any time between the moment that the detected value of the test section of power described in process starts to increase of screw rod when nondecreasing, is used as screw rod resistance.
Described injection moulding machine also has the resin pressure test section of the resin pressure that detects screw rod the place ahead, described screw rod resistance calculating part carries out deducting from the detected value of described power test section the calculating of the detected value of described resin pressure test section and the product value of screw rod area of section, using the absolute value of calculated value as screw rod resistance.
Described injection moulding machine also has the resin pressure test section of the resin pressure that detects screw rod the place ahead, the value that the detected value that described screw rod resistance calculating part carries out described power test section obtains divided by the area of section of screw rod deducts the calculating of the detected value of described resin pressure test section, using the absolute value of calculated value as screw rod resistance.
Described resin quantity delivered adjusting portion regulates the resin quantity delivered of described resin material supply unit, so that described screw rod resistance becomes predetermined desired value.
According to the present invention, a kind of special test section that does not need to detect the moulding material in screw slot can be provided, and can not be subject to measuring the big or small impact of rotary speed, keep suitable starvation to carry out material supply, there is the injection moulding machine of resin quantity delivered adjusting portion.
Accompanying drawing explanation
Fig. 1 is the block diagram of a mode of the explanation injection moulding machine with resin quantity delivered adjusting portion of the present invention.
Fig. 2 is the flow chart that carries out the processing of resin quantity delivered adjusting according to the absolute value of the suffered power (screw rod resistance) of any time screw rod starting to advance to screw rod from decompression operation completes.
Fig. 3 is the flow chart that the absolute value of the suffered power of any time screw rod between the moment that starts to increase according to the suffered power of screw rod in the nondecreasing moment of the suffered power of screw rod from decompression process starts the process of advancing to screw rod carries out the processing of resin quantity delivered adjusting.
Fig. 4 is the screw rod resistance after the impact causing according to the resin pressure P that removes screw rod the place ahead from the suffered power D of screw rod, carries out the flow chart of the 1st example of the processing of resin quantity delivered adjusting.
Fig. 5 is the screw rod resistance after the impact causing according to the resin pressure P that removes screw rod the place ahead the value obtaining divided by the area of section of this screw rod from the suffered power D of screw rod, carries out the flow chart of the 2nd example of the processing of resin quantity delivered adjusting.
The specific embodiment
At the resin supply port of injection cylinder, be full of under the state of particle (, starvation is close situation), forward-reverse action for screw rod, the resin of half melting state of screw rod root becomes drag, screw rod is subject to and the rightabout resistance of direct of travel (following, this resistance to be called to " screw rod resistance ").On the other hand, be sparse in the situation that, few at the resin of screw rod root half melting state at starvation, so screw rod resistance is little.
The present invention is conceived to this characteristic, and the screw rod resistance being subject in the axial direction according to screw rod is suitably controlled the quantity delivered of resin material.That is, detect the screw rod resistance that screw rod is subject in the axial direction, along with this detected resistance becomes the quantity delivered that reduces greatly resin material, keep thus suitable starvation to carry out material supply.
Utilize Fig. 1 that the injection moulding machine with resin quantity delivered adjusting portion of the present invention is described.
On the central axis direction of injection cylinder 2, rotatably the screw rod of injection moulding machine 1 is inserted in injection cylinder 2 movably and around this central shaft.The axial movement of this screw rod 1 (injection moulding action) uses servomotor M1 to carry out by injection moulding, and in addition, the rotation of screw rod 1 is rotated with servomotor M2 and injection moulding and carried out independently with servomotor M1 by screw rod.
In addition, the base portion upper surface at injection cylinder 2 is configured for the hopper 4 that drops into the particle that becomes moulding material.In addition, becoming the particle loader 5 that between the hopper 4 in pellet supply source and injection cylinder 2 is provided for the particle in hopper 4 to offer injection cylinder 2.The blade-carrying rotor 7 that this particle loader 5 is equipped with by being transverse in the communication path 6 that forms between hopper 4 and injection cylinder 2, as the motor M3 of the rotary driving part of this blade-carrying rotor 7 and the motor drive circuit 8 of controlling the rotary speed of this motor M3, form.And, by control the rotary speed of blade-carrying rotor 7 according to the quantity delivered command value F of resin, to be admitted to the translational speed of the particle of injection cylinder 2 from hopper 4, adjust.
In addition, can utilize resin to supply with the blade-carrying rotor 7 that replaces forming particle loader 5 with screw rod.At this moment, can rotarily actuate resin supply with motor M3 sends into particle in injection cylinder 2 with screw rod.
In injection moulding, with servomotor M1 and screw rod, rotate with rotary encoder P1 and P2 are installed respectively on servomotor M2 the current location of the axis direction of detection screw rod 1 and axle center current location (position of rotation) around etc.
The control device 100 of injection moulding machine has the microprocessor (PMC-CPU) 113 that microprocessor (hereinafter referred to as CNC-CPU) 111 that Numerical Control uses and programmable machine bed controller are used.On PMC-CPU113, be connected with storage for controlling RAM109 and the currency storage RAM108 for ROM116, non-volatile PMC of the sequentially-operating of injection moulding machine and the sequential programme of particle loader 5 etc.CNC-CPU111 is for whole each portion of injection moulding machine that controls, via servo interface 110 connected servomotor (not shown) for locking, servomotor (not shown), screw rod servomotor for the rotation demoulding for, injection moulding drive the servo circuit of each axle of control with servomotor etc.In addition, in Fig. 1, only illustrate the servo circuit 101 of using servomotor M2 with servo circuit 102 and the screw rod rotation of servomotor M1 for injection moulding.
Non-volatile total RAM104 has the setting memory portion that the memory portion of NC program etc. of each action of injection moulding machine and the various setting values of storage, parameter, macro-variable etc. are controlled in storage.And, in this setting memory portion, also store via the manual data input unit 117 with LCD display unit and guidance panel controller 115 and set the various conditions of molding of input and measuring condition etc. by operator.
Bus arbiter controller bus arbiter controller112(is hereinafter referred to as BAC) be connected with each bus of CNC-CPU111 and PMC-CPU113, total RAM104, input circuit 105, output circuit 106, with BAC112, control used bus.
Injection moulding is connected with servo circuit 102 with servomotor M1, and the detection of the encoder of spinning in the future P1 is input in this servo circuit 102, detects all the time the current location (axially) of screw rod 1 by the current location memory register in servo interface 110.In addition, screw rod rotation is connected with servo circuit 101 with servomotor M2, and the detection of the encoder of spinning in the future P2 is input to this servo circuit 101, thereby carries out the control of position, speed.RAM103 is for storing the memory of the operational data of CNC-CPU111.
The output circuit 106 of control device 100 is connected with motor drive circuit 8 via D/A transformer 9.Motor drive circuit 8 is by carrying out drive control motor M3 according to the speed command that carrys out self-control device 100 after these D/A transformer 9 conversion, blade-carrying rotor 7 by particle loader 5, according to feeding speed corresponding to the speed command with carrying out self-control device 100, offers injection cylinder 2 by the particle in hopper 4 thus.
By above structure, use the NC program of storing in ROM114 for CNC, the various conditions of molding of storing in total RAM104 and at PMC with the sequential programme of storing in ROM116 etc., PMC-CPU113 carries out sequential control, thereby CNC-CPU111 drives control injection moulding machine via the servo circuit dispense-pulse of each axle of 110 pairs of injection moulding machines of servo interface simultaneously, this point is controlled identical with the driving of existing injection moulding machine.
, measuring, in the operation of mixing, with now the same, CNC-CPU111 drives and controls injection moulding servomotor M1 according to predefined back pressure in total RAM104, in addition, the CNC-CPU111 receiving from the measurement commencing signal of PMC-CPU113 starts the pulse distribution of each predetermined period according to predefined screw rod rotary speed in total RAM104 via servo interface 110, the servo circuit 101 that possesses error register or F/V transformer and error amplifier or power amplifier etc. carries out position according to the dispense-pulse from CNC-CPU111 with from the feedback pulse of rotary encoder P2, speed, each processing of electric current loop, controlling screw rod rotates with servomotor M2 so that the rotary speed of screw rod 1 becomes setting speed.
In addition, although omitted diagram, in the suffered in the axial direction power of injection mo(u)lding machine testing screw rod, between screw rod 1 and screw drive portion, possess the force detectors such as strain gauge or load cell.And, at the front part of injection cylinder 2, can possess the sensor that detects resin pressure.Output signal from these force detectors and pressure sensor is sent to control device 100 via input circuit 105.
Processing shown in the flow chart of resin quantity delivered adjusting portion execution graph 2～Fig. 5 that above-mentioned injection moulding machine possesses.
< screw rod resistance calculating part >
Screw rod is subject to resistance (screw rod resistance) from the resin of half melting state of screw rod root, but in the molding procedure such as injection moulding, pressurize, except screw rod resistance, also the thawing resin from screw rod the place ahead is subject to power proportional to resin pressure.The power of this resin pressure and the density of starvation do not have dependency relation, therefore do not become the index of starvation, so need to eliminate the power of this resin pressure, only detect screw rod resistance.
General in the operation of injection mo(u)lding, after measuring operation, the decompression operation that screw rod is retreated resin pressure is reduced pressure.In addition, in a part of forming method, the operation that sometimes reduces pressure after pressurize operation (decompression in advance), then measures operation.After this decompression operation completes, make resin pressure decompression, therefore starting to advance to screw rod from decompression operation completes, the suffered in the axial direction power of screw rod is probably consistent with screw rod resistance.Therefore, can be being accomplished to any time of screw rod between advancing from decompression and detecting the absolute value of the suffered in the axial direction power of screw rod, using it as screw rod resistance (with reference to the step SA08 of Fig. 2).
In addition, the any time of the state reducing pressure from resin pressure (, the moment that resin pressure is depressurized in screw rod fallback procedures) to the screw rod resin pressure in process that advances, start the moment increasing, the suffered in the axial direction power of screw rod is probably consistent with screw rod resistance.Now, in the state that is conceived to not be depressurized at resin pressure, by screw rod is retreated, screw rod reduces in axially suffered power, even if but when making resin pressure decompression, screw rod is retreated, the situation that the suffered in the axial direction power of screw rod also can not reduce; Even and if screw rod is advanced in the state being depressurized at resin pressure, the suffered in the axial direction power of screw rod can not increase yet, but when screw rod moves on resin pressure while again increasing, the situation that the suffered in the axial direction power of screw rod increases, can be from screw rod fallback procedures the suffered in the axial direction nondecreasing moment of power of screw rod start to advance in process any time of screw rod between the moment that axially suffered power starts to increase to screw rod, detect screw rod at the absolute value of axially suffered power, using it as screw rod resistance (with reference to step SB04, the SB13 of Fig. 3).
At spray nozzle part or injection cylinder front part, the pressure sensor that detects resin pressure is set, according to calculate the power of resin pressure with the detected resin pressure of this pressure sensor, then, can calculate screw rod resistance by the power of the resin pressure that calculates described in getting rid of from the suffered power of screw rod.At this moment, even if resin pressure does not reduce pressure, also can calculate screw rod resistance according to the detected value of resin pressure, therefore can calculate arbitrarily screw rod resistance constantly.For example, can be constantly arbitrarily, detect the absolute value that deducts the value that the detected value of resin pressure and the product of screw rod cross section face obtain from the suffered in the axial direction power of screw rod, using it as screw rod resistance (with reference to the step SC05 of Fig. 4).
In addition, the suffered power of screw rod can be scaled after pressure unit, remove the one-tenth of resin pressure and assign to calculate screw rod resistance.For example, can be constantly arbitrarily, detect the absolute value that deducts the value that the detected value of resin pressure obtains the value obtaining divided by screw rod area of section from the suffered in the axial direction power of screw rod, using it as screw rod resistance (with reference to the step SD05 of Fig. 5).
< is about decompression operation >
In decompression operation, can resin pressure be reduced pressure by screw rod is retreated, also can be by making screw rod to the direction rotation contrary with direction of measurement, resin pressure be reduced pressure.In addition, even if can will screw rod be retreated in decompression operation, screw rod is judged to be in the axial suffered nondecreasing moment of power the moment that resin pressure is depressurized, even if also can make screw rod reverse rotation in decompression operation, screw rod is judged to be in the axial suffered nondecreasing moment of power the moment that resin pressure is depressurized.
< detects screw rod at the power test section > of axially suffered power
As detecting the power test section of screw rod in axially suffered power, can between screw rod and screw drive portion, possess the power test sections such as strain gauge or load cell as mentioned above.In addition, also can in the servo circuit of drive screw vertically, form well-known Load Disturbance Observer, detect the suffered power of screw rod.In addition, when driving movable part with servomotor, can detect the suffered power of screw rod according to the drive current of servomotor.In addition, during with hydraulic-driven screw rod, can detect the suffered power of screw rod according to the force value of hydraulic pressure.In addition, can detected pressures replace screw rod in axial suffered power.
The initial value > of the quantity delivered command value of < resin
The initial value of the quantity delivered command value F of the resin of setting when running can be started is made as the fixed value corresponding with the specification of the diameter of screw rod 1 etc., also can obtain products formed volume according to measuring completing place etc., and the amount of resin suitable with this volume is provided.Can the initial value of quantity delivered command value F is pre-stored in the total RAM104 as nonvolatile memory.
< is about the calculating > of the quantity delivered command value of resin
Calculating about quantity delivered command value F, when detected screw rod resistance is greater than predetermined desired value, starvation is close, therefore adjusting quantity delivered command value F diminishes it, on the other hand, when detected screw rod resistance is less than predetermined desired value, starvation is sparse, therefore adjusts quantity delivered command value F and makes it become large.According to the deviation between detected screw rod resistance and predetermined desired value, carry out PID control in addition, calculate quantity delivered command value F and make screw rod resistance consistent with predetermined desired value.
< is about the setting > of the desired value of screw rod resistance
As mentioned above, by control, make detected screw rod resistance become predetermined desired value, thereby can control, that starvation is become is constant.When forming suitable starvation, screw rod resistance is almost nil sometimes.Therefore, can be by the zero desired value that is set as screw rod resistance.In addition, when know in advance while forming suitable starvation screw rod resistance time, this value can be set as to desired value.In addition, can detect the screw rod resistance of the state of filling (the resin supply port of injection cylinder is full of the state of particle), the value this value being multiplied by after pre-determined factor (0< coefficient <1) is set as to desired value.
< is about resin quantity delivered adjusting portion >
Resin quantity delivered adjusting portion can regulate according to the quantity delivered command value F calculating the quantity delivered of the resin material of every 1 molding cycle.For example, as Unexamined Patent 6-304967 communique, record, if use feed worm provides the resin material supply unit of resin material, can control the feed worm rotation amount of every 1 molding cycle.Or, also can control the feed worm rotational time of every 1 molding cycle.Or resin quantity delivered adjusting portion can regulate according to the supply command value F calculating described in molding cycle the quantity delivered of the resin material of each unit interval.For example, if utilize feed worm that the resin material supply unit of resin material is provided, the rotary speed of the feed worm in the time of can controlling resin material and supply with.At this moment, resin supply adjusting portion can be supplied with accordingly with the predetermined operation of molding cycle.For example, can to the finish time, supply with from measuring the zero hour of operation, also can to the finish time, supply with from the zero hour of molding cycle.Or, can set and supply with the zero hour and supply with the finish time, make the service time of 1 molding cycle become the constant time.
Fig. 2 carries out resin quantity delivered according to the absolute value of the suffered power (screw rod resistance) of any time screw rod advancing starting to screw rod from decompression operation finishes to regulate the flow chart of processing.Below, according to each step, describe.
[step SA01] sets the initial value of quantity delivered command value F.
[step SA02] carries out injection moulding, pressurize operation.
[step SA03] starts to measure.
[step SA04] calculates the quantity delivered command value F of (renewal) resin, so that the desired value that the screw rod resistance that detects and store in the step SA08 of front molding cycle equals to predetermine.
[step SA05] provides resin according to the quantity delivered command value F of the resin calculating at step SA04.
[step SA06], if while having carried out the measurement of resin of scheduled volume, finishes to measure.
[step SA07] carries out decompression operation.
[step SA08] detects the absolute value of the suffered power of screw rod, is used as screw rod resistance.
Whether [step SA09] judgement running finishes, and when running does not finish, returns to step SA02 and continues this processing, finishes this processing when running finishes.
Fig. 3 is the absolute value that is carved into the suffered power of any time screw rod that screw rod advances between the moment that the suffered power of screw rod starts to increase in process when the suffered power of screw rod is nondecreasing from decompression process, carries out resin quantity delivered and regulates the flow chart of processing.Below, according to each step, describe.
[step SB01] sets the initial value of quantity delivered command value F.
[step SB02] carries out injection moulding operation.
[step SB03] judges whether the suffered power of screw rod increases, and (YES) when increasing, transfers to step SB05, when not increasing (no), transfers to step SB04.
[step SB04] detects the absolute value of the suffered power of screw rod, is used as screw rod resistance.
[step SB05] completes injection moulding operation.
[step SB06] carries out pressurize operation.
[step SB07] starts to measure operation.
[step SB08] calculates the quantity delivered command value F of (renewal) resin, so that screw rod resistance detected or that detect and store at the step SB13 of front molding cycle becomes desired value at step SB04.
[step SB09] provides resin according to the quantity delivered command value F of the resin calculating at the step SB08 of front molding cycle.
[step SB10], when carrying out the measurement of resin of scheduled volume, completes measurement.
[step SB11] starts the operation that reduces pressure.
[step SB12] judges whether the suffered power of screw rod reduces, and when not reducing (no), forwards step SB13 to, and (YES) when reducing is waited for becoming and do not reduced.
[step SB13] detects the absolute value of the suffered power of screw rod, is used as screw rod resistance.
[step SB14] completes decompression.
Whether [step SB15] judgement running finishes, and when running does not finish, returns to step SB02 and continues to process, and finishes this processing when running finishes.
Fig. 4 is the screw rod resistance after the impact producing according to the resin pressure P that removes screw rod the place ahead from the suffered power D of screw rod, carries out the flow chart that resin quantity delivered regulates the 1st example of processing.
[step SC01] sets the initial value of quantity delivered command value F.
[step SC02] carries out injection moulding, pressurize operation.
[step SC03] starts to measure.
[step SC04] detects the suffered power D of screw rod and the resin pressure P in screw rod the place ahead.
The resin pressure P that [step SC05] deducts screw rod the place ahead from the suffered power D of screw rod is multiplied by the value (P * A) that screw rod area of section A obtains, using the absolute value of the value of resulting result as screw rod resistance F.That is, calculate F=|D-P * A|.
[step SC06] calculates the quantity delivered command value F of resin, the desired value that the screw rod resistance F that makes to calculate at step SC05 equals to predetermine.
[step SC07] provides resin according to the resin quantity delivered F calculating at step SC06.
Whether [step SC08] judgement measurement finishes, and (YES) when measuring end, transfers to step SC09, when measurement does not finish (no), transfers to step SC04.
[step SC09] carries out decompression operation.
Whether [step SC10] judgement running finishes, and when running does not finish, returns to step SC02 and continues to process, end process when running finishes.
Fig. 5 carries out the flow chart of the 2nd example that resin quantity delivered regulate to process according to screw rod resistance, this screw rod resistance is the screw rod resistance that has removed the impact that screw rod the place ahead resin pressure P produces the value obtaining divided by the area of section of this screw rod from all power D of screw rod.
Processing (step SC01-step SC10) shown in the flow chart of processing shown in the flow chart of this Fig. 5 (step SD01-step SD10) and described Fig. 4 is almost identical, but the processing of the step SD05 of the flow chart of Fig. 5 is the value (D/A) obtaining divided by screw rod area of section A from the suffered power D of screw rod, to deduct the resin pressure P in screw rod the place ahead, using the absolute value of the value of the result obtaining as screw rod resistance F.That is, calculate F=|D/A-P|, different from the processing (calculating of F=|D-P * A|) of the step SC05 of the flow chart of Fig. 4 in this, but the processing of other step is identical.
Claims (6)
1. an injection moulding machine, there is injection cylinder, screw rod, in forward-reverse direction, drive this screw rod screw rod forward-reverse drive division, detect the power test section of the power that described screw rod is subject in the axial direction, to the resin material supply unit of supplying with resin material in described injection cylinder, described injection moulding machine is characterised in that also possess:
Screw rod resistance calculating part, its detected value according to described power test section calculates screw rod resistance;
Resin quantity delivered adjusting portion, it,, along with described screw rod resistance becomes large, diminishes the resin quantity delivered of described resin material supply unit.
2. injection moulding machine according to claim 1, is characterized in that,
Described screw rod resistance calculating part calculates from decompression operation finishes the absolute value of detected value of the described power test section of any time of screw rod starting to advance, is used as screw rod resistance.
3. injection moulding machine according to claim 1, is characterized in that,
Described screw rod resistance calculating part calculates detected value from the test section of power described in decompression process and is carved into the advance absolute value of detected value of described power test section of any time between the moment that the detected value of the test section of power described in process starts to increase of screw rod when nondecreasing, is used as screw rod resistance.
4. injection moulding machine according to claim 1, is characterized in that,
The resin pressure test section also with the resin pressure that detects screw rod the place ahead,
Described screw rod resistance calculating part carries out deducting from the detected value of described power test section the calculating of the detected value of described resin pressure test section and the product value of screw rod area of section, using the absolute value of calculated value as screw rod resistance.
5. injection moulding machine according to claim 1, is characterized in that,
The resin pressure test section also with the resin pressure that detects screw rod the place ahead,
The value that the detected value that described screw rod resistance calculating part carries out described power test section obtains divided by the area of section of screw rod deducts the calculating of the detected value of described resin pressure test section, using the absolute value of calculated value as screw rod resistance.
6. according to the injection moulding machine described in any one of claim 1～5, it is characterized in that,
Described resin quantity delivered adjusting portion regulates the resin quantity delivered of described resin material supply unit, so that described screw rod resistance becomes predetermined desired value.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-166129 | 2012-07-26 | ||
| JP2012166129 | 2012-07-26 | ||
| JP2013090401A JP5543632B2 (en) | 2012-07-26 | 2013-04-23 | Injection molding machine having a resin supply amount adjustment unit |
| JP2013-090401 | 2013-04-23 |
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| Publication Number | Publication Date |
|---|---|
| CN103568209A true CN103568209A (en) | 2014-02-12 |
| CN103568209B CN103568209B (en) | 2017-08-08 |
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| CN201310316642.8A Active CN103568209B (en) | 2012-07-26 | 2013-07-25 | Injection moulding machine with resin quantity delivered adjustment portion |
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| JP (1) | JP5543632B2 (en) |
| CN (1) | CN103568209B (en) |
| DE (1) | DE102013012067B4 (en) |
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| WO2023024763A1 (en) * | 2021-08-23 | 2023-03-02 | 西诺控股集团有限公司 | Control method and apparatus for intelligently measuring plasticizing capacity |
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| AT516122B1 (en) * | 2014-08-14 | 2017-01-15 | Engel Austria Gmbh | Method for dosing plastic granules |
| US20180281250A1 (en) * | 2017-03-29 | 2018-10-04 | Maguire Products, Inc. | Dual signal additive feeding method and apparatus |
| KR102067873B1 (en) * | 2017-09-28 | 2020-01-17 | 주식회사 대건테크 | Method for calculating metal powder supply rate of 3d printer |
| DE102017126946A1 (en) | 2017-11-16 | 2019-05-16 | Kraussmaffei Technologies Gmbh | Process for the production of plastic molded parts |
| AT523150B1 (en) | 2019-11-28 | 2021-06-15 | Engel Austria Gmbh | Method for influencing a backlog length and / or a screw return speed |
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| JP2014040090A (en) | 2014-03-06 |
| DE102013012067B4 (en) | 2021-06-24 |
| DE102013012067A1 (en) | 2014-01-30 |
| CN103568209B (en) | 2017-08-08 |
| JP5543632B2 (en) | 2014-07-09 |
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