CN102285067B - Injection molding machine having resin supply quantity adjusting unit - Google Patents

Injection molding machine having resin supply quantity adjusting unit Download PDF

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Publication number
CN102285067B
CN102285067B CN201110133991.7A CN201110133991A CN102285067B CN 102285067 B CN102285067 B CN 102285067B CN 201110133991 A CN201110133991 A CN 201110133991A CN 102285067 B CN102285067 B CN 102285067B
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China
Prior art keywords
screw rod
rotation amount
rod rotation
metering
injection moulding
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CN201110133991.7A
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Chinese (zh)
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CN102285067A (en
Inventor
丸山淳平
内山辰宏
高次聪
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Fanuc Corp
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Fanuc Corp
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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
    • 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
    • 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
    • B29C2945/761—Dimensions, e.g. thickness
    • B29C2945/76107—Dimensions, e.g. thickness volume
    • 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
    • B29C2945/7619—Injection unit barrel
    • B29C2945/76193—Injection unit barrel barrel-chamber
    • 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
    • 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
    • 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
    • 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
    • B29C2945/76668—Injection unit barrel
    • B29C2945/76672—Injection unit barrel barrel-chamber
    • B29C2945/76675—Injection unit barrel barrel-chamber screw ante-chamber
    • 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
    • B29C2945/76846—Metering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76936—The operating conditions are corrected in the next phase or cycle

Abstract

The invention provides an injection molding machine having a resin supply quantity adjusting unit. The injection molding machine realizes detection of a screw rotation amount under measurement and thus enables the detected screw rotation amount to be consistent with a target value or enables the screw rotation amount/screw retraction amount to be consistent with the target value through the control of a supply quantity of resin material, thereby maintaining a constant starvation state for supply of the resin material.

Description

The injection moulding machine with resin quantity delivered regulon
Technical field
The present invention relates to injection moulding machine, particularly there is the injection moulding machine of resin quantity delivered regulon.
Background technology
As the injection cylinder to injection moulding machine, supply with the method for the particle that becomes moulding material, general use is stored in particle to be communicated with injection cylinder in the feeding hopper arranging, and utilizes its deadweight that particle is sent into the method in injection cylinder.In this case, the resin supply port of injection cylinder becomes the state that piles with particle.This state is called to " full supply " below.
On the other hand, a small amount of particle of known each supply makes the resin supply port of injection cylinder become so-called " the hungry supply " of sparse state.For example, in Japanese kokai publication hei 5-318531 communique, disclose between pellet supply source and injection cylinder grain feeder has been set, by increasing and decreasing the feeding speed of this grain feeder, controlled the technology of the feed speed of particle.
When carrying out hunger supply, estimate to have and promote the gas that produces in injection cylinder from the deoxidation of resin supply port, or suppress the such effect of inordinate wear of the injection cylinder inwall that the friction due near injection cylinder inwall resin supply port and resin material causes.But when density state (starvation) change of the resin material of resin supply port, the plasticizing quality fluctuations of the resin in measurement process, likely makes a very bad impression to Forming Quality.Therefore in the situation that carrying out hunger supply, existence must make starvation keep constant problem of carrying out material supply.
In TOHKEMY 2002-248655 communique, disclose the supply unit closing in screw rod the moulding material detecting unit that detects the moulding material in screw slot has been set, corresponding with the testing result of this moulding material detecting unit, control the quantity delivered of resin material, make moulding material in screw slot, be discontented with 100% technology.Need to be for detection of the such problem in the special unit of the moulding material in screw slot but exist.
In Japanese kokai publication sho 53-11957 communique, the torque of the screw rod rotation detecting in measurement process is disclosed, in order to make the detected rotating torques technology of adjusting the quantity delivered of raw material consistent with a reference value.But according to the kind of resin material, even starvation change sometimes, the torque of screw rod rotation does not change yet, in this case, existence cannot be controlled according to the torque of screw rod rotation the problem of starvation.
In Japanese kokai publication hei 1-171830 communique, the actual metering time and the predefined benchmark that disclose while using identifying unit to judge plasticizing operation measure the poor of time, control the technology of the material quantity delivered of material feeding apparatus according to this result of determination.But, because the metering time with the size of screw rod rotary speed, change, so there is the problem that cannot correctly judge starvation.
In Japanese kokai publication hei 3-114813 communique, disclose when the raw material that uses color replacement object carries out color replacement running, intermittently open and close resin passage off and in the raw material feed device of feed appliance base feed resin, as the supply that determines color replacement resin, start the judgment standard in period, set the technology of total rotation number of setting-up time or screw rod rotation.
In Japanese kokai publication hei 3-118132 communique, disclose according to the metrical information of sensor that is arranged on each portion of injection moulding machine, judge in the injection moulding machine whether measurement data corresponding with predefined each supervision project monitor in allowed band, accumulation computing is from the screw rod rotation amount of rotation zero hour of screw rod, the technology that one of supervision project using this screw rod rotation amount during as charging/measurement process is used.
Summary of the invention
Therefore, the present invention proposes in view of above-mentioned prior art problem, its object is to provide a kind of injection moulding machine, it need to be for detection of the special unit of the moulding material in screw slot, and can not rely on the kind of resin material, do not measured the impact of rotary speed size, make starvation keep steady state and carry out material supply.
The first method of injection moulding machine of the present invention, has injection cylinder; Rotatable and the screw rod that can advance and retreat and arrange in this injection cylinder; Rotarily actuate the screw rod rotary drive unit of this screw rod; Detect the screw rod rotation amount detecting unit of the screw rod rotation amount in predetermined interval; To the resin material feed unit of supplying with resin material in injection cylinder, also there is resin quantity delivered regulon, it regulates the resin quantity delivered of described resin material feed unit, so that the detected screw rod rotation amount of described screw rod rotation amount detecting unit becomes predetermined desired value.
Above-mentioned injection moulding machine can also have desired value setup unit, and its value that the detected screw rod rotation amount of described screw rod rotation amount detecting unit is multiplied by after predetermined hungry coefficient of passing through when full supply compacted under is set as described predetermined desired value.
Described predetermined interval is to start to the interval of metering end from metering, or is the interval arbitrarily a plurality of intervals the interval Further Division that starts to finish to metering from metering.
The second method of injection moulding machine of the present invention, has injection cylinder; Rotatable and the screw rod that can advance and retreat and arrange in this injection cylinder; Rotarily actuate the screw rod rotary drive unit of this screw rod; Detect the screw rod rotation amount detecting unit of the screw rod rotation amount in predetermined interval; The screw rod that detects the screw rod amount of retreating in predetermined interval retreats amount detection unit; To the resin material feed unit of supplying with resin material in injection cylinder, also there is resin quantity delivered regulon, it regulates the resin quantity delivered of described resin material feed unit, so that retreated the value measuring and become predetermined desired value divided by retreat the detected screw rod of amount detection unit by described screw rod by the detected screw rod rotation amount of described screw rod rotation amount detecting unit.
Above-mentioned injection moulding machine can also have desired value setup unit, and its detected screw rod rotation amount of described screw rod rotation amount detecting unit that passes through when full supply compacted under retreats the value measuring and is multiplied by the value that predetermined hungry coefficient obtains and is set as described predetermined desired value divided by retreat the detected screw rod of amount detection unit by described screw rod.
Described predetermined interval is to start to the interval of metering end from metering, or is the interval arbitrarily a plurality of intervals the interval Further Division that starts to finish to metering from metering.
According to the present invention, a kind of injection moulding machine can be provided, and it need to be for detection of the special unit of the moulding material in screw slot, and can not rely on the kind of resin material, do not measured the impact of rotary speed size, make starvation keep steady state and carry out material supply.
Accompanying drawing explanation
Fig. 1 means the pith cross section of the injection moulding machine with resin quantity delivered regulon of the present invention and the block diagram of control device thereof.
Fig. 2 means the flow chart of algorithm that carries out the processing of resin quantity delivered adjusting according to the screw rod rotation amount in metering of the present invention.
Fig. 3 means the flow chart of algorithm that carries out the processing of resin quantity delivered adjusting according to the ratio of the screw rod rotation amount in metering and metering range of the present invention.
Fig. 4 A and Fig. 4 B mean the flow chart of the algorithm of the processing that comprises the desired value of setting screw rod rotation amount in carry out the processing of resin quantity delivered adjusting according to the screw rod rotation amount in metering of the present invention.
Fig. 5 means of the present invention according to the flow chart of algorithm that the interval that starts to finish to metering from metering is further divided into interval screw rod rotation amount arbitrarily a plurality of intervals and carries out the processing of resin quantity delivered adjusting.
The specific embodiment
When carrying out hunger, supply with while making density of material become sparse, in measurement process, there is the characteristic that the plasticizing capacity of the resin that screw rod often rotates a circle reduces.That is, during with full supply, compare, in order to measure the needed screw rod rotation amount of predetermined amount of resin, increase.The present invention is conceived to this characteristic, optimally controls the quantity delivered of resin material according to the screw rod rotation amount in metering.That is, the screw rod rotation amount in measuring by detection is controlled the quantity delivered of resin material, makes this detected screw rod rotation amount consistent with predetermined value, keeps thus constant starvation to carry out material supply.
Fig. 1 means the pith cross section of the injection moulding machine with resin quantity delivered regulon of the present invention and the block diagram of control device thereof.
The injection screw 1 of injection moulding machine slidably and is rotationally embedded in injection cylinder 2, by injection moulding, uses the rotation of servomotor M1 and screw rod with servomotor M2, carry out independently that axial injection moulding is moved and rotate around the screw rod of axle.Symbol 31 is for making injection screw 1 carry out the Poewr transmission mechanism of injection moulding action with servomotor M1 as drive source injection moulding, and symbol 32 is for making injection screw 1 carry out the Poewr transmission mechanism of meter action with servomotor M2 as drive source screw rod rotation.In addition, the not shown heating unit being formed by band heater etc. in the interior setting of injection cylinder 2.
In addition, at the base portion upper surface of injection cylinder 2, be equipped with for dropping into the hopper 4 of the particle that becomes moulding material, becoming the grain feeder 5 being provided between the hopper 4 of supply source of particle and injection cylinder 2 to the particle in injection cylinder 2 feeding hoppers 4.The impeller 7 with blade that grain feeder 5 is equipped with by being transverse in the communication path 6 that forms between hopper 4 and injection cylinder 2, as this, with the motor M3 of the rotary drive unit of the impeller 7 of blade and the motor drive circuit 8 of controlling the rotary speed of this motor M3, form, by controlling the rotary speed with the impeller 7 of blade according to the quantity delivered command value F of resin, adjust the screen of the particle of sending into injection cylinder 2 from hopper 4.
In addition, also can replace forming the impeller 7 with blade of the major part of grain feeder 5, and adopt the structure of metering bolt special and periphery thereof, with motor M3, rotarily actuate and measure bolt special particle is sent in injection cylinder 2.In injection moulding, with the rotation of servomotor M1 and screw rod, with on each of servomotor M2, rotary encoder P1 and P2 are installed, the current location (direction of principal axis) of detection injection screw 1, position of rotation (around axle) etc.
The control device 100 of injection moulding machine has the microprocessor (hereinafter referred to as PMC-CPU) 113 that microprocessor for Numerical Control (hereinafter referred to as CNC-CPU) 111, programmable device controller are used.On PMC-CPU 113, be connected with to have stored and control the sequentially-operating of injection moulding machine, the ROM 116 of the sequential programme of grain feeder 5 etc., non-volatile PMC store RAM108 with RAM 109 and currency.CNC-CPU 111 controls each portion of injection moulding machine for integral body, connected driving control the servo circuit that clamping is used (not shown), released the servomotor of using each axles such as (not shown), screw rod rotation are used, injection moulding is used by servo interface 110.In addition, in Fig. 1, only represent with the servo circuit 102 of servomotor M1 with for screw rod, to rotate the servo circuit 101 with servomotor M2 for injection moulding.
Symbol 104 represents non-volatile RAM Shared, has the storage part of NC program etc. that each action of injection moulding machine is controlled in storage; Setting storage part with the various setting values of storage, parameter, macro-variable etc.The various conditions of molding that in setting storage part in this RAM Shared, storage is inputted by the manual data input unit 117 with LCD display unit and 115 settings of CE/operator panel controller by operator and metering condition etc.Symbol 112 represents bus arbitration controller (hereinafter referred to as BAC), each bus that connects CNC-CPU 111 and PMC-CPU 113, RAM Shared 104, input circuit 105, output circuit 106 on this BAC 112, controls by above-mentioned BAC 112 bus of using.
Injection moulding is connected with servo circuit 102 with servomotor M1, and the detection from rotary encoder P1 is inputed to servo circuit 102, detects all the time the current location (axially) of injection screw 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 from rotary encoder P2 is inputed to servo circuit 101, carries out the control of position, speed.RAM 103 is the operational data memories for CNC-CPU 111.
In addition, on the output circuit 106 of control device 100, by D/A converter 9, connect motor drive circuit 8, according to the speed command that carrys out self-control device 100 having carried out in this D/A converter 9 after D/A conversion, by motor drive circuit 8 drive control motor M3, the impeller 7 with blade of grain feeder 5 is with feeding speed corresponding to the speed command with carrying out self-control device 100, to the particle in injection cylinder 2 feeding hoppers 4.
In above structure, by the various conditions of molding in the NC program of storage in ROM 114, storage in RAM Shared 104 for CNC and at PMC with the sequential programme of storage in ROM 116 etc., PMC-CPU 113 carries out sequential control, CNC-CPU 111 carries out pulse distribution to the servo circuit of each axle of injection moulding machine via servo interface 110 simultaneously, drive control injection moulding machine, about injection moulding machine body, the driving control mode of each portion is with existing identical.
In metering/mixing operation, according to predefined back pressure in RAM Shared 104 same drive and control injection moulding servomotor M1, in addition, receive the CNC-CPU 111 bases predefined screw rod rotary speed in RAM Shared 104 from the metering commencing signal of PMC-CPU 113, via servo interface 110, start the pulse distribution of each predetermined period.Then, the servo circuit 101 with error register or F/V converter and error amplifier or power amplifier etc. according to the dispense-pulse from CNC-CPU 111 and from the feedback pulse of rotary encoder P2, carry out position, speed, electric current loop each process, output torque instruction, control screw rod rotation and use servomotor M2, make the rotary speed of injection screw 1 become setting speed.
Above-mentioned injection moulding machine and control device thereof are the processing of the algorithm shown in the flow chart of execution graph 2～Fig. 5, therefore have the function of following explanation.
The initial value > of the quantity delivered command value F of < resin
The initial value of the quantity delivered command value F setting when running can be started, as eigenvalue corresponding to diameter equal-specification specification with injection screw 1, also can be used as the value of supplying with the amount of resin suitable with products formed volume.Can the initial value of quantity delivered command value F is pre-stored in the RAM Shared 104 as nonvolatile storage.
< screw rod rotation amount detecting unit >
Screw rod rotation amount detecting unit is to detect and the unit of the screw rod rotation amount of storage injection screw 1, for example, on screw rod rotating shaft, have rotary encoder P2, when detecting and storing measurement process and starting and the value from rotary encoder P2 in while end.The detected value from rotary encoder P2 for example, when measurement process is started and while finishing is stored in RAM 103.Then, obtain two values poor of above-mentioned detection and storage, the screw rod rotation amount using the difference of these two values in metering is stored in RAM 103.Or screw rod rotation amount detecting unit also can have rotary speed detector on screw rod rotating shaft, the time integral value of the screw rod rotary speed while obtaining measurement process from the outset to end.
< is about the calculating > of the quantity delivered command value F of resin
When calculating quantity delivered command value F, because in the situation that above-mentioned detected screw rod rotation amount is less than predetermined desired value, starvation is dense (being in other words full state), so adjust, quantity delivered command value F is reduced.On the other hand, because in the situation that above-mentioned detected screw rod rotation amount is larger than predetermined desired value, starvation is sparse, so can adjust, quantity delivered command value F is increased.
Or, also can carry out PID (Proportional-Integral-Derivative PID) according to the deviation of the detected screw rod rotation amount of above-mentioned screw rod rotation amount detecting unit and predetermined desired value and control, calculate quantity delivered command value.
Or, in the situation that the value that above-mentioned detected screw rod rotation amount obtains divided by the above-mentioned detected screw rod amount of retreating (aftermentioned) is less than predetermined desired value, because starvation is dense (in other words, being full state), so adjust, quantity delivered command value F is reduced.On the other hand, in the situation that above-mentioned detected screw rod rotation amount retreats divided by above-mentioned detected screw rod the value measuring is larger than predetermined desired value, because starvation is sparse, so adjust, quantity delivered command value F is increased.
Or the deviation that can also retreat the value that measures and predetermined desired value divided by above-mentioned detected screw rod according to above-mentioned detected screw rod rotation amount is carried out PID control, calculates quantity delivered command value F.
< is about resin quantity delivered regulon >
Resin quantity delivered regulon can, according to the above-mentioned quantity delivered command value F calculating, regulate the quantity delivered of the resin material of each molding cycle.For example, control the rotation amount of the impeller 7 with blade of grain feeder 5, or as Japanese kokai publication hei 6-304967 communique, if use, supply with the resin material feed unit that screw rod is supplied with resin material, can control the rotation amount of the supply screw rod of each molding cycle.Or, can control the rotational time of the supply screw rod of each molding cycle.
Or resin quantity delivered regulon can, according to the above-mentioned quantity delivered command value F calculating, regulate the quantity delivered of the resin material of each unit interval.For example, control the rotary speed of the impeller 7 with blade of grain feeder 5, or as Japanese kokai publication hei 6-304967 communique, if use, supply with the resin material feed unit that screw rod is supplied with resin material, the rotary speed of the supply screw rod in the time of can controlling resin material supply.Now, can make to supply with screw rod and rotate to the finish time from the zero hour of measurement process, also can to the finish time, rotate from the zero hour of molding cycle.
< screw rod retreats amount detection unit >
As screw rod, retreat amount detection unit, use to detect the screw position detecting unit (for example, at the rotary encoder P1 installing on servomotor M1, detect the axial current location of injection screw 1 for injection moulding) of the position of screw rod forward-reverse direction, the value of screw position separately when detecting and storing measurement process and starting and during end.Then obtain the poor of above-mentioned two values that detect and store, the screw rod amount of retreating using it in metering.Or, also can there is the screw rod forward-reverse speed detection unit of the speed that detects screw rod forward-reverse direction, obtain that this speed detection unit is detected, the time integral value of the screw rod forward-reverse speed while starting from measurement process when finishing.
The value > that < obtains divided by screw rod backway about screw rod rotation amount
As mentioned above, by controlling so that the screw rod rotation amount in measuring becomes the desired value of setting, can control starvation constant, but about for becoming the above-mentioned desired value of suitable starvation, need to set respectively according to metering volume the value of different desired values.Therefore,, in the situation that change the products formed that moulding is wanted in metal die change, need to again adjust for becoming the desired value of the screw rod rotation amount of suitable starvation according to products formed volume.For example, changing metal die, products formed volume becomes in the situation of twice, about for becoming the above-mentioned desired value of suitable starvation, need to again set the value of twice substantially, and this operation likely becomes operator's burden.
Therefore, the value that can obtain divided by the screw rod amount of retreating (screw rod backway) according to the screw rod rotation amount in metering is controlled, and makes starvation constant.Now, even when replacing metal die has changed the products formed of wanting moulding, because corresponding with products formed volume, the screw rod rotation amount in metering with the screw rod amount of retreating both sides with substantially identical rate of change, so that the screw rod rotation amount in metering retreats divided by screw rod the value measuring is almost constant.Therefore, do not need the operation of adjustment aim value again, can alleviate operator's burden.
< is about the setting > of desired value
As mentioned above, by controlling the screw rod rotation amount making in metering, become the desired value of setting, can control and make starvation constant thus, but about for becoming the above-mentioned desired value of suitable starvation, need to consider that the characteristic of resin or the plasticizing capacity of the standard based on screw rod shape etc. set, be difficult to set best desired value.
Therefore, can be before forming starvation, temporarily carry out the moulding by full supply, screw rod rotation amount while detecting full state compacted under by above-mentioned screw rod rotation amount detecting unit, is multiplied by this detected screw rod rotation amount the value that predetermined hungry coefficient obtains and is set as above-mentioned predetermined desired value.Now, because the screw rod rotation amount during using full state compacted under is as benchmark, screw rod rotation amount as said reference is multiplied by the value that predetermined hungry coefficient obtains and is set as desired value, so do not need the operation of considering that the characteristic of resin or the plasticizing capacity of the standard based on screw rod shape etc. are set, can alleviate operator's burden.
In addition, in the present invention, so-called hungry coefficient be with when completely supplying with as value corresponding to the density of the starvation of benchmark, the ratio of the screw rod rotation amount of the screw rod rotation amount of meaning when completely supplying with during as the hunger supply of benchmark.The value that the screw rod rotation amount of screw rod rotation amount when in other words, hungry coefficient means hungry supply during divided by full supply obtains.Above-mentioned predetermined hungry coefficient, since irrelevant with the characteristic of resin or the plasticizing capacity of the standard based on screw rod shape, as long as set the value corresponding with the density of the starvation of wanting to form, so set easily.Generally, by setting the hungry coefficient of 1.1～1.2 left and right, can carry out stable metering.Hungry coefficient is 1.1～1.2, while meaning with full supply, compares, and screw rod rotation amount becomes 1.1～1.2 times of quantity delivereds that reduce like that resin.In addition, above-mentioned predetermined hungry coefficient also can be set by operator, also can make in advance the eigenvalue of resin quantity delivered regulon storage 1.1～1.2 left and right.
Fig. 2 means the flow chart of algorithm that carries out the processing of resin quantity delivered adjusting according to the screw rod rotation amount in metering of the present invention.In accordance with each step, describe below.In addition, when running starts, manual potting resin in injection cylinder.
[step SA100] sets the initial value of quantity delivered command value F.
[step SA101] carries out injection moulding/pressurize operation.
[step SA102] starts metering.
[step SA103] basis is at the interim quantity delivered command value F supply resin calculating the last week.In addition, in initial molding cycle, according to the initial value of the quantity delivered command value F setting, supply with resin in step SA100.
Screw rod rotary encoder value C1 when [step SA104] detects and store metering beginning.
Whether [step SA105] judgement metering completes, and transfers to step SA106 when metering completes.
[step SA106] detects and stores the screw rod rotary encoder value C2 while having measured.
[step SA107] according to detected encoder values C1 in step SA104 and in step SA106 detected encoder values C2, calculate the screw rod rotation amount Δ C (=C2-C1) in metering.
[step SA108] calculates the quantity delivered command value F of resin, so that the screw rod rotation amount Δ C in the metering calculating in step SA107 becomes desired value.
Whether [step SA109] judgement running finishes, and returns to step SA101 and continue this processing in the unclosed situation of running, finishes this processing in the situation that running has finished.
Fig. 3 means of the present invention according to the ratio of the screw rod rotation amount in metering and metering range, the flow chart of algorithm that carries out the processing of resin quantity delivered adjusting.In accordance with each step, describe below.In addition, when running starts, manual potting resin in injection cylinder.
[step SB100] sets the initial value of quantity delivered command value F.
[step SB101] carries out injection moulding/pressurize operation.
[step SB102] starts metering.
[step SB103] supplies with resin according to the quantity delivered command value F in interim calculating the last week.In addition, in initial molding cycle, according to the initial value of the quantity delivered command value F setting, supply with resin in step SB100.
Screw rod rotary encoder value C1 when [step SB104] detects and store metering beginning.
Screw position X1 when [step SB105] detects and store metering beginning.
Whether [step SB106] judgement metering completes, and transfers to step SB107 in the situation that metering completes.
[step SB107] detects and stores the screw rod rotary encoder value C2 while having measured.
[step SB108] detects and stores the screw position X2 while having measured.
[step SB109] is according to obtaining screw rod rotation amount (C2-C1) at the detected encoder values C1 of step SB104 with at the detected encoder values C2 of step SB107, and then according to the detected screw position X1 of step SB105 and in step SB108 detected screw position X2 obtain the screw rod amount of retreating (X2-X1), carry out
ΔC/ΔX＝(C2-C1)/(X2-X1)
Calculating, obtain the screw rod rotation amount/screw rod amount of retreating (=Δ C/ Δ X) in metering.
[step SB110] calculates the quantity delivered command value F of resin, so that screw rod rotation amount/screw rod amount of retreating (=Δ C/ Δ X) that obtain in step SB109, in metering becomes desired value.
Whether [step SB111] judgement running finishes, and returns to step SB101 and continue this processing in the unclosed situation of running, finishes this processing in the situation that running has finished.
Fig. 4 A and Fig. 4 B mean the flow chart of the algorithm of the processing that comprises the desired value of setting screw rod rotation amount in carry out the processing of resin quantity delivered adjusting according to the screw rod rotation amount in metering of the present invention.In accordance with each step, describe below.In addition, when running starts, manual potting resin in injection cylinder.
[step SC100] supplies with resin material, makes resin become dense state (full state).
[step SC101] carries out injection moulding/pressurize operation.
[step SC102] starts metering.
Screw rod rotary encoder value C ' 1 when [step SC103] detects and store metering beginning.
Whether [step SC104] judgement metering completes, and transfers to step SC105 in the situation that metering completes.
[step SC105] detects and stores the screw rod rotary encoder value C ' 2 while having measured.
Screw rod rotation amount Δ C ' in [step SC106] calculating metering (=C ' 2-C ' 1).
[step SC107] calculates and target setting value S by S=K Δ C '.In formula, K is hungry coefficient.
[step SC108] sets the initial value of quantity delivered command value F.
[step SC109] carries out injection moulding/pressurize operation.
[step SC110] starts metering.
[step SC111] basis is at the interim quantity delivered command value F supply resin calculating the last week.In addition in initial molding cycle, use, the initial value of the quantity delivered command value F setting in step SC108.
Screw rod rotary encoder value C1 when [step SC112] detects and store metering beginning.
Whether [step SC113] judgement metering completes, and transfers to step SC114 in the situation that metering completes.
[step SC114] detects and stores the screw rod rotary encoder value C2 while having measured.
[step SC115] calculates the screw rod rotation amount Δ C (=C2-C1) in metering.
[step SC116] calculates the quantity delivered command value F of resin, so that the screw rod rotation amount Δ C in metering becomes desired value S.
Whether [step SC117] judgement running finishes, and returns to step SC109 and continues to process, end process in the situation that running has finished in the unclosed situation of running.
Fig. 5 means of the present invention according to the flow chart that from the metering interval Further Division that starts to complete to metering is the algorithm of interval screw rod rotation amount arbitrarily a plurality of intervals processing of carrying out the adjusting of resin quantity delivered.In accordance with each step, describe below.In addition, when running starts, manual potting resin in injection cylinder.
[step SD100] sets the initial value of quantity delivered command value F.
[step SD101] carries out injection moulding/pressurize operation.
[step SD102] starts metering.
[step SD103] supplies with resin according to the quantity delivered command value F calculating in last interval.In addition, in initial interval, according to the quantity delivered command value F setting, supply with resin in step SD100.
[step SD104] detects the screw rod rotary encoder value C3 while also starting between memory block.
[step SD105] detects the screw position X3 while also starting between memory block.
[step SD106] detects and stores current screw position Xn.
Whether the difference of screw position X3 when [step SD107] judges current screw position Xn and interval beginning is greater than the predetermined amount of retreating, and transfers to step SD108 when being greater than, and returns to step SD106 when being not more than.
[step SD108] detects the screw rod rotary encoder value C4 while also finishing between memory block.
[step SD109] according at the detected encoder values C3 of step SD104 with at the detected encoder values C4 of step SD108, screw rod rotation amount Δ C (=C4-C3) in computation interval, in metering.
[step SD110] calculates the quantity delivered command value F of resin, so that the screw rod rotation amount Δ C in that calculate in step SD104, in interval, metering becomes desired value.
Whether [step SD111] judgement metering completes, and returns to step SD103 and continue this processing in the uncompleted situation of interval metering.When having completed, metering transfers to step SD112.
Whether [step SD112] judgement running finishes, and returns to step SD101 and continues to process, end process in the situation that running has finished in the unclosed situation of running.

Claims (10)

1. an injection moulding machine, has injection cylinder; Rotatable and the screw rod that can advance and retreat and arrange in this injection cylinder; Rotarily actuate the screw rod rotary drive unit of this screw rod; Detect the screw rod rotation amount detecting unit of the screw rod rotation amount in predetermined interval; To the resin material feed unit of supplying with resin material in injection cylinder, described injection moulding machine is characterised in that,
There is resin quantity delivered regulon, it is in order to make the detected screw rod rotation amount of described screw rod rotation amount detecting unit become predetermined desired value, when described screw rod rotation amount is greater than predetermined desired value, regulate the resin quantity delivered of described resin material feed unit that quantity delivered is increased, when described screw rod rotation amount is less than predetermined desired value, regulate the resin quantity delivered of described resin material feed unit that quantity delivered is reduced.
2. injection moulding machine according to claim 1, is characterized in that,
Also have desired value setup unit, its value that the detected screw rod rotation amount of described screw rod rotation amount detecting unit is multiplied by after predetermined hungry coefficient of passing through when full supply compacted under is set as described predetermined desired value.
3. injection moulding machine according to claim 1, is characterized in that,
Described predetermined desired value is the value that operator sets.
4. injection moulding machine according to claim 1, is characterized in that,
Described predetermined interval is to start the interval of finishing to metering from metering.
5. injection moulding machine according to claim 1, is characterized in that,
Described predetermined interval is to be the interval arbitrarily a plurality of intervals the interval Further Division that starts to finish to metering from metering.
6. an injection moulding machine, has injection cylinder; Rotatable and the screw rod that can advance and retreat and arrange in this injection cylinder; Rotarily actuate the screw rod rotary drive unit of this screw rod; Detect the screw rod rotation amount detecting unit of the screw rod rotation amount in predetermined interval; The screw rod that detects the screw rod amount of retreating in predetermined interval retreats amount detection unit; To the resin material feed unit of supplying with resin material in injection cylinder, described injection moulding machine is characterised in that,
There is resin quantity delivered regulon, it regulates the resin quantity delivered of described resin material feed unit, so that retreated the value measuring and become predetermined desired value divided by retreat the detected screw rod of amount detection unit by described screw rod by the detected screw rod rotation amount of described screw rod rotation amount detecting unit.
7. injection moulding machine according to claim 6, is characterized in that,
Also have desired value setup unit, its detected screw rod rotation amount of described screw rod rotation amount detecting unit that passes through when full supply compacted under retreats the value measuring and is multiplied by the value that predetermined hungry coefficient obtains and is set as described predetermined desired value divided by retreat the detected screw rod of amount detection unit by described screw rod.
8. injection moulding machine according to claim 6, is characterized in that,
Described predetermined desired value is the value that operator sets.
9. injection moulding machine according to claim 6, is characterized in that,
Described predetermined interval is to start the interval of finishing to metering from metering.
10. injection moulding machine according to claim 6, is characterized in that,
Described predetermined interval is to be the interval arbitrarily a plurality of intervals the interval Further Division that starts to finish to metering from metering.
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