CN102285067A - 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
CN102285067A
CN102285067A CN2011101339917A CN201110133991A CN102285067A CN 102285067 A CN102285067 A CN 102285067A CN 2011101339917 A CN2011101339917 A CN 2011101339917A CN 201110133991 A CN201110133991 A CN 201110133991A CN 102285067 A CN102285067 A CN 102285067A
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CN
China
Prior art keywords
screw rod
rotation amount
metering
rod rotation
injection moulding
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Granted
Application number
CN2011101339917A
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Chinese (zh)
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CN102285067B (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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Publication of CN102285067B publication Critical patent/CN102285067B/en
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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
    • 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

Injection moulding machine with resin quantity delivered regulon
Technical field
The present invention relates to injection moulding machine, particularly have the injection moulding machine of resin quantity delivered regulon.
Background technology
As method from the particle that becomes moulding material to the injection cylinder of injection moulding machine that supply with, general use particle is stored in injection cylinder is communicated with in the feeding hopper that is provided with, utilize it to conduct oneself with dignity particle sent into method in the injection cylinder.In this case, the resin supply port of injection cylinder becomes the state that piles with particle.Below this state is called " the full supply ".
Relative therewith, a spot 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 the particle feed appliance has been set between pellet supply source and injection cylinder, controlled the technology of the feed speed of particle by the feeding speed that increases and decreases this particle feed appliance.
When carrying out the hunger supply, estimate to have the deoxidation of gas that promotion produces in injection cylinder, perhaps suppress because the such effect of inordinate wear of the injection cylinder inwall that the friction of near injection cylinder inwall the resin supply port and resin material causes from the resin supply port.But when density state (starvation) change of the resin material of resin supply port, the plasticizing quality fluctuations of the resin in the measurement process might make a very bad impression to Forming Quality.Therefore carrying out under the hungry situation about supplying with, existence must make starvation keep the constant problem that material is supplied with of carrying out.
In TOHKEMY 2002-248655 communique, disclose the supply unit that closes in the screw rod moulding material detecting unit that detects the moulding material in the screw slot has been set, corresponding with the testing result of this moulding material detecting unit, the quantity delivered of control resin material makes moulding material be discontented with 100% technology in screw slot.But there is the such problem in special unit that need be used to detect the moulding material in the screw slot.
In Japanese kokai publication sho 53-11957 communique, the torque of the screw rod rotation that detects in the measurement process is disclosed, in order to make the consistent technology of adjusting the quantity delivered of raw material with a reference value of detected rotating torques.But according to the kind of resin material, even starvation change sometimes, the torque of screw rod rotation does not change yet, and in this case, existence can't be controlled the problem of starvation according to the torque of screw rod rotation.
In Japanese kokai publication hei 1-171830 communique, the metering time and the predefined benchmark that disclose the reality when using identifying unit to judge the 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 change with the size of screw rod rotary speed, so there is the problem that can't correctly judge starvation.
In Japanese kokai publication hei 3-114813 communique, disclose when the raw material that uses the color replacement object carries out the color replacement running, intermittently open and close resin passage off and in the raw material feed device of feed appliance base feed resin, begin the judgment standard in period as the supply of decision color replacement resin, set the technology of total rotation number of setting-up time or screw rod rotation.
In Japanese kokai publication hei 3-118132 communique, disclose in the metrical information of sensor according to each one that is arranged on injection moulding machine, judge in the injection moulding machine whether measurement data corresponding with predefined each monitor item monitor in allowed band, the accumulation computing is from the screw rod rotation amount of rotation zero hour of screw rod, the technology of one of monitor item this screw rod rotation amount during as charging/measurement process use.
Summary of the invention
Therefore, the present invention proposes in view of above-mentioned prior art problem, its purpose is to provide a kind of injection moulding machine, it does not need to be used to detect the special unit of the moulding material in the screw slot, and can not rely on the kind of resin material, do not measured the influence of rotary speed size, make starvation keep steady state ground to carry out material and supply with.
First mode of injection moulding machine of the present invention has injection cylinder; Rotatable and the screw rod that can be provided with in this injection cylinder with advancing and retreat; Rotation drives 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 the predetermined interval; In injection cylinder, supply with the resin material feed unit of resin material, also has 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 target value.
Above-mentioned injection moulding machine can also have the desired value setup unit, and its value that the detected screw rod rotation amount of described screw rod rotation amount detecting unit multiply by behind the predetermined hungry coefficient of passing through when completely supplying with compacted under is set at described predetermined target value.
Described predetermined interval is to begin the interval of finishing to metering from metering, or begin further to be divided into to the interval that metering finishes interval arbitrarily a plurality of intervals from metering.
Second mode of injection moulding machine of the present invention has injection cylinder; Rotatable and the screw rod that can be provided with in this injection cylinder with advancing and retreat; Rotation drives 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 the predetermined interval; The screw rod that detects the screw rod amount of retreating in the predetermined interval retreats amount detection unit; In injection cylinder, supply with the resin material feed unit of resin material, also has resin quantity delivered regulon, it regulates the resin quantity delivered of described resin material feed unit, so that become predetermined target value by the detected screw rod rotation amount of described screw rod rotation amount detecting unit divided by retreat the value that the detected screw rod of the amount detection unit amount of retreating obtains by described screw rod.
Above-mentioned injection moulding machine can also have the desired value setup unit, and its detected screw rod rotation amount of described screw rod rotation amount detecting unit that passes through when completely supplying with compacted under is set at described predetermined target value divided by retreat the value that obtains with predetermined hungry coefficient on duty that the detected screw rod of the amount detection unit amount of retreating obtains by described screw rod.
Described predetermined interval is to begin the interval of finishing to metering from metering, or begin further to be divided into to the interval that metering finishes interval arbitrarily a plurality of intervals from metering.
According to the present invention, a kind of injection moulding machine can be provided, and it does not need to be used to detect the special unit of the moulding material in the screw slot, and can not rely on the kind of resin material, do not measured the influence of rotary speed size, make starvation keep steady state ground to carry out material and supply with.
Description of drawings
Fig. 1 is the pith cross section of the expression injection moulding machine with resin quantity delivered regulon of the present invention and the block diagram of control device thereof.
Fig. 2 is the expression flow chart that carries out the algorithm of the processing that the resin quantity delivered regulates according to the screw rod rotation amount in the metering of the present invention.
Fig. 3 is the flow chart that the expression ratio according to screw rod rotation amount in the metering and metering range of the present invention carries out the algorithm of the processing that the resin quantity delivered regulates.
Fig. 4 A and Fig. 4 B are the flow charts of the algorithm of the expression processing that comprises the desired value of setting the screw rod rotation amount in carry out the processing that the resin quantity delivered regulates according to the screw rod rotation amount in the metering of the present invention.
Fig. 5 is that expression is of the present invention according to carrying out the flow chart of the algorithm of the processing that the resin quantity delivered regulates begin further to be divided into to the interval that metering finishes interval arbitrarily screw rod rotation amount a plurality of intervals from metering.
The specific embodiment
Supply with when making density of material become sparse when carrying out hunger, in measurement process, have the characteristic that the plasticizing capacity of the resin that screw rod whenever rotates a circle reduces.That is, compare when completely supplying with, increase in order to measure the needed screw rod rotation amount of predetermined amount of resin.The present invention is conceived to this characteristic, optimally controls the quantity delivered of resin material according to the screw rod rotation amount in the metering.That is, control the quantity delivered of resin material, make this detected screw rod rotation amount consistent, keep constant starvation to carry out the material supply thus with predetermined value by detecting screw rod rotation amount in the metering.
Fig. 1 is the pith cross section of the expression 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 reaches and is embedded in rotationally in the injection cylinder 2, independently carries out screw rod rotation that axial injection moulding move and center on axle with servomotor M1 and screw rod rotation with servomotor M2 by injection moulding.Symbol 31 is to be used for making injection moulding injection screw 1 carry out the Poewr transmission mechanism of injection moulding action with servomotor M1 as drive source, and symbol 32 is to be used for making the screw rod rotation injection screw 1 carry out the Poewr transmission mechanism of meter action with servomotor M2 as drive source.In addition, the not shown heating unit that is made of band heater etc. is set in injection cylinder 2.
In addition, be equipped with the hopper 4 that is used to drop into the particle that becomes moulding material, between the hopper 4 of the supply source that becomes particle and injection cylinder 2, be provided for the particle feed appliance 5 of the particle in injection cylinder 2 feeding hoppers 4 at the base portion upper surface of injection cylinder 2.The impeller 7 of the band blade that particle feed appliance 5 is equipped with by being transverse in the communication path 6 that forms between hopper 4 and the injection cylinder 2, constitute as the motor M3 of the rotary drive unit of the impeller 7 of this band blade and the motor drive circuit 8 of controlling the rotary speed of this motor M3, by rotary speed, adjust the handover speed of the particle of sending into to injection cylinder 2 from hopper 4 according to the impeller 7 of the quantity delivered command value F of resin control band blade.
In addition, also can replace constituting the impeller 7 of band blade of the major part of particle feed appliance 5, and adopt the structure of metering bolt special and periphery thereof, drive with motor M3 rotation and measure bolt special particle is sent in the injection cylinder 2.With on each of servomotor M2 rotary encoder P1 and P2 are installed with the rotation of servomotor M1 and screw rod in injection moulding, detect the current location (direction of principal axis), position of rotation (around axle) of injection screw 1 etc.
The control device 100 of injection moulding machine has the microprocessor (to call PMC-CPU in the following text) 113 that Numerical Control is used with microprocessor (hereinafter referred to as CNC-CPU) 111, programmable device controller.The ROM 116, the non-volatile PMC that are connected with the sequentially-operating of having stored the control injection moulding machine, the sequential programme of particle feed appliance 5 etc. on PMC-CPU 113 store RAM108 with RAM 109 and currency.CNC-CPU 111 is used for each one of whole control injection moulding machine, has connected by servo interface 110 to drive control and clamp with (not shown), release the servo circuit of using etc. the servomotor of each with (not shown), screw rod rotation with, injection moulding.In addition, in Fig. 1, only represent to be used for the servo circuit 102 and the servo circuit 101 that be used for screw rod rotation usefulness servomotor M2 of injection moulding with servomotor M1.
The RAM Shared that symbol 104 expression is non-volatile has the storage part of NC program etc. of each action of storage control injection moulding machine; Setting storage part with the various setting values of storage, parameter, macro-variable etc.Storage is by manual data input unit 117 and the CE/operator panel controller 115 various conditions of molding of setting input and the metering condition etc. of operator by having the LCD display unit in the setting storage part in this RAM Shared.Symbol 112 expression bus arbitration controllers (to call BAC in the following text), each bus that connects CNC-CPU 111 and PMC-CPU 113, RAM Shared 104, input circuit 105, output circuit 106 on this BAC 112 is by the bus of above-mentioned BAC 112 control uses.
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 the current location (axially) of injection screw 1 all the time by the current location memory register in the servo interface 110.In addition, the 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 that are used for CNC-CPU 111.
In addition, on the output circuit 106 of control device 100, connect motor drive circuit 8 by D/A converter 9, according to the speed command that in this D/A converter 9, has carried out after the D/A conversion from control device 100, by motor drive circuit 8 drive control motor M3, the impeller 7 of the band blade of particle feed appliance 5 with from the corresponding feeding speed of the speed command of control device 100, the particle in injection cylinder 2 feeding hoppers 4.
In above structure, by CNC with the various conditions of molding of the NC program of storage among the ROM 114, storage in RAM Shared 104 and at PMC with the sequential programme of storage among the ROM 116 etc., PMC-CPU 113 carries out sequential control, simultaneously CNC-CPU 111 carries out pulse distribution to each servo circuit of injection moulding machine via servo interface 110, drive the control injection moulding machine, about the injection moulding machine body, the driving control mode of each one and existing identical.
Promptly in metering/mixing operation, drive control injection moulding servomotor M1 according to predefined back pressure in RAM Shared 104 samely, in addition, receive CNC-CPU 111 bases predefined screw rod rotary speed in RAM Shared 104, via the pulse distribution of servo interface 110 each predetermined period of beginning from the metering commencing signal of PMC-CPU 113.Then, servo circuit 101 with error register or F/V converter and error amplifier or power amplifier etc. is according to each is handled from the dispense-pulse of CNC-CPU 111 with from the feedback pulse of rotary encoder P2 carries out position, speed, electric current loop, the output torque instruction, servomotor M2 is used in the rotation of control screw rod, makes 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 that can set when beginning running, as with the corresponding eigenvalue of specification specification such as diameter of injection screw 1, also can be used as the value of supplying with the amount of resin suitable with moulding product volume.Can be stored in the initial value of quantity delivered command value F in advance 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 has rotary encoder P2 on the screw rod rotating shaft, detects and storage measurement process when beginning and the value from rotary encoder P2 in when end.When for example measurement process being begun and the detected value when finishing from rotary encoder P2 be stored in the RAM 103.Then, obtain two values poor of above-mentioned detection and storage, the difference of these two values is stored among the RAM 103 as the screw rod rotation amount in the metering.Perhaps, screw rod rotation amount detecting unit also can have rotary speed detector on the screw rod rotating shaft, the time integral value of the screw rod rotary speed when obtaining measurement process from the outset to end.
＜about the calculating of the quantity delivered command value F of resin 〉
When calculating quantity delivered command value F, because under the above-mentioned detected screw rod rotation amount situation littler than predetermined target value, starvation is dense (in other words being full state), so adjust quantity delivered command value F is reduced.On the other hand, because under the above-mentioned detected screw rod rotation amount situation bigger than predetermined target value, starvation is sparse, quantity delivered command value F is increased so can adjust.
Perhaps, also can carry out PID (Proportional-Integral-Derivative PID) control, calculate the quantity delivered command value according to the deviation of detected screw rod rotation amount of above-mentioned screw rod rotation amount detecting unit and predetermined target value.
Perhaps, under value that above-mentioned detected screw rod rotation amount obtains divided by the above-mentioned detected screw rod amount of retreating (aftermentioned) situation littler than predetermined target value, because starvation is dense (in other words, being full state), quantity delivered command value F is reduced so adjust.On the other hand, under value that above-mentioned detected screw rod rotation amount obtains divided by the above-mentioned detected screw rod amount of the retreating situation bigger,, quantity delivered command value F is increased so adjust because starvation is sparse than predetermined target value.
Perhaps, the value that can also obtain divided by the above-mentioned detected screw rod amount of retreating according to above-mentioned detected screw rod rotation amount and the deviation of predetermined target value are carried out PID control, calculate quantity delivered command value F.
＜about resin quantity delivered regulon 〉
The quantity delivered command value F that resin quantity delivered regulon can go out according to aforementioned calculation, the quantity delivered of regulating the resin material of each molding cycle.For example, the rotation amount of the impeller 7 of the band blade of control particle feed appliance 5, perhaps, supply with the resin material feed unit that screw rod is supplied with resin material, then can control the rotation amount of the supply screw rod of each molding cycle if use as Japanese kokai publication hei 6-304967 communique.Perhaps, can control the rotational time of the supply screw rod of each molding cycle.
Perhaps, the quantity delivered command value F that resin quantity delivered regulon can go out according to aforementioned calculation, the quantity delivered of regulating the resin material of each unit interval.For example, the rotary speed of the impeller 7 of the band blade of control particle feed appliance 5, perhaps, 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 then can controlling the resin material supply if use as Japanese kokai publication hei 6-304967 communique.At this moment, the supply screw rod is rotated from the zero hour of measurement process to the finish time, also can rotate to the finish time from the zero hour of molding cycle.
＜screw rod retreats amount detection unit 〉
Retreat amount detection unit as screw rod, use to detect the position of screw rod forward-reverse direction the screw position detecting unit (for example injection moulding with servomotor M1 on rotary encoder P1 that install, that detect the axial current location of injection screw 1), detect and storage measurement process separately value of screw position when beginning and during end.Obtain the poor of above-mentioned two values that detect and store then, with its as the metering in the screw rod amount of retreating.Perhaps, also can have 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 when measurement process begins when finishing.
＜the value that obtains divided by the screw rod backway about the screw rod rotation amount 〉
As mentioned above, by controlling so that the screw rod rotation amount in measuring becomes target value set, it is constant to control starvation, but about being used to become the above-mentioned desired value of suitable starvation, need set the value of different desired values according to metered volume respectively.Therefore, want under the situation of moulding product of moulding changing the metal die change, need adjust the desired value of the screw rod rotation amount that is used to become suitable starvation once more according to moulding product volume.For example, changing metal die, moulding product volume becomes under the situation of twice, about being used to become the above-mentioned desired value of suitable starvation, needs to set the value of twice substantially once more, and this operation might become operator's burden.
Therefore, can control divided by the value that the screw rod amount of retreating (screw rod backway) obtains, make starvation constant according to the screw rod rotation amount in the metering.At this moment, even when the replacing metal die has changed the moulding product of wanting moulding, because corresponding with moulding product volume, the screw rod rotation amount in the metering and the screw rod amount of retreating both sides are with identical substantially rate of change, so the screw rod rotation amount in the metering is almost constant divided by the value that the screw rod amount of retreating obtains.Therefore, do not need to adjust once more the operation of desired value, can alleviate operator's burden.
＜about the setting of desired value 〉
As mentioned above, become target value set by controlling the screw rod rotation amount that makes in the metering, can control thus makes starvation constant, but about being used to become the above-mentioned desired value of suitable starvation, need to consider the characteristic of resin or set, be difficult to set best desired value based on the plasticizing capacity of the standard of screw rod shape etc.
Therefore, can be before forming starvation, temporarily carry out moulding by full supply, screw rod rotation amount when detecting full state compacted under by above-mentioned screw rod rotation amount detecting unit multiply by the value that predetermined hungry coefficient obtains to this detected screw rod rotation amount and is set at above-mentioned predetermined target value.At this moment, because the screw rod rotation amount during full state compacted under is as benchmark, screw rod rotation amount as said reference be multiply by the value that predetermined hungry coefficient obtains be set at desired value, so do not need to consider the characteristic of resin or the operation of setting based on plasticizing capacity of the standard of screw rod shape etc., can alleviate operator's burden.
In addition, in the present invention, so-called hungry coefficient be with when completely supplying with as the corresponding value of 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 the when completely supplying with obtains.Above-mentioned predetermined hungry coefficient because with the characteristic of resin or irrelevant based on the plasticizing capacity of the standard of screw rod shape, as long as set the value corresponding, so setting is easy with the density of the starvation of wanting to form.Generally, by setting the hungry coefficient about 1.1～1.2, can carry out stable metering.Hungry coefficient is 1.1～1.2, means to compare when completely supplying with, and the screw rod rotation amount becomes 1.1～1.2 times of quantity delivereds that reduce resin like that.In addition, above-mentioned predetermined hungry coefficient also can be set by the operator, also can make the eigenvalue of resin quantity delivered regulon storage about 1.1～1.2 in advance.
Fig. 2 is the expression flow chart that carries out the algorithm of the processing that the resin quantity delivered regulates according to the screw rod rotation amount in the metering of the present invention.Below abideing by each step describes.In addition, when the running beginning, 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] begins metering.
[step SA103] basis is at the interim quantity delivered command value F supply resin that calculates the last week.In addition, the initial value according to the quantity delivered command value F that sets in step SA100 is supplied with resin in initial molding cycle.
Screw rod rotary encoder value C1 when [step SA104] detects and store the metering beginning.
[step SA105] judges that whether metering is finished, and transfers to step SA106 when metering is finished.
[step SA106] detects and stores the screw rod rotary encoder value C2 that measures when finishing.
[step SA107] according to detected encoder values C1 in step SA104 and in step SA106 detected encoder values C2, calculate screw rod rotation amount Δ C in the metering (=C2-C1).
[step SA108] calculates the quantity delivered command value F of resin, so that the screw rod rotation amount Δ C in the metering that calculates in step SA107 becomes desired value.
[step SA109] judges whether running finishes, and returns step SA101 and continue this processing under the unclosed situation of running, finishes this processing under the situation that running has finished.
Fig. 3 is the expression ratio according to screw rod rotation amount in the metering and metering range of the present invention, carries out the flow chart of the algorithm of the processing that the resin quantity delivered regulates.Below abideing by each step describes.In addition, when the running beginning, 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] begins metering.
[step SB103] supplies with resin according to the quantity delivered command value F in interim calculating the last week.In addition, the initial value according to the quantity delivered command value F that sets in step SB100 is supplied with resin in initial molding cycle.
Screw rod rotary encoder value C1 when [step SB104] detects and store the metering beginning.
Screw position X1 when [step SB105] detects and store the metering beginning.
[step SB106] judges that whether metering is finished, and transfers to step SB107 under the situation that metering is finished.
[step SB107] detects and stores the screw rod rotary encoder value C2 that measures when finishing.
[step SB108] detects and stores the screw position X2 that measures when finishing.
[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 the 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 the metering becomes desired value.
[step SB111] judges whether running finishes, and returns step SB101 and continue this processing under the unclosed situation of running, finishes this processing under the situation that running has finished.
Fig. 4 A and Fig. 4 B are the flow charts of the algorithm of the expression processing that comprises the desired value of setting the screw rod rotation amount in carry out the processing that the resin quantity delivered regulates according to the screw rod rotation amount in the metering of the present invention.Below abideing by each step describes.In addition, when the running beginning, 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] begins metering.
Screw rod rotary encoder value C ' 1 when [step SC103] detects and store the metering beginning.
[step SC104] judges that whether metering is finished, and transfers to step SC105 under the situation that metering is finished.
[step SC105] detects and stores the screw rod rotary encoder value C ' 2 that measures when finishing.
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 the 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] begins metering.
[step SC111] basis is at the interim quantity delivered command value F supply resin that calculates the last week.In addition, in initial molding cycle, use the initial value of the quantity delivered command value F that in step SC108, sets.
Screw rod rotary encoder value C1 when [step SC112] detects and store the metering beginning.
[step SC113] judges that whether metering is finished, and transfers to step SC114 under the situation that metering is finished.
[step SC114] detects and stores the screw rod rotary encoder value C2 that measures when finishing.
Screw rod rotation amount Δ C in [step SC115] calculating metering (=C2-C1).
[step SC116] calculates the quantity delivered command value F of resin, so that the screw rod rotation amount Δ C in the metering becomes desired value S.
[step SC117] judges whether running finishes, and returns step SC109 and continue to handle end process under the situation that running has finished under the unclosed situation of running.
Fig. 5 is that expression is of the present invention according to carrying out the flow chart of the algorithm of the processing that the resin quantity delivered regulates begin further to be divided into to the interval that metering is finished interval arbitrarily screw rod rotation amount a plurality of intervals from metering.Below abideing by each step describes.In addition, when the running beginning, 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] begins metering.
[step SD103] supplies with resin according to the quantity delivered command value F that calculates in last interval.In addition, in initial interval, supply with resin according to the quantity delivered command value F that in step SD100, sets.
[step SD104] detects the screw rod rotary encoder value C3 when also beginning between the memory block.
[step SD105] detects the screw position X3 when also beginning between the memory block.
[step SD106] detects and stores current screw position Xn.
Whether the difference of the screw position X3 when [step SD107] judges current screw position Xn and interval beginning greater than the predetermined amount of retreating, greater than the time transfer to step SD108, when being not more than, return step SD106.
[step SD108] detects the screw rod rotary encoder value C4 when also finishing between the 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 in the computation interval, in the metering (=C4-C3).
[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 the interval, the metering becomes desired value.
[step SD111] judges that whether metering is finished, and returns step SD103 and continues this processing under the uncompleted situation of the metering in interval.Transfer to step SD112 when having finished in metering.
[step SD112] judges whether running finishes, and returns step SD101 and continue to handle end process under the situation that running has finished under the unclosed situation of running.

Claims (10)

1. an injection moulding machine has injection cylinder; Rotatable and the screw rod that can be provided with in this injection cylinder with advancing and retreat; Rotation drives 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 the predetermined interval; Supply with the resin material feed unit of resin material in injection cylinder, described injection moulding machine is characterised in that,
Have 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 target value.
2. injection moulding machine according to claim 1 is characterized in that,
Also have the desired value setup unit, its value that the detected screw rod rotation amount of described screw rod rotation amount detecting unit multiply by behind the predetermined hungry coefficient of passing through when completely supplying with compacted under is set at described predetermined target value.
3. injection moulding machine according to claim 1 and 2 is characterized in that,
Described predetermined target value is the value that the operator sets.
4. injection moulding machine according to claim 1 is characterized in that,
Described predetermined interval is to begin to the interval of metering end from metering.
5. injection moulding machine according to claim 1 is characterized in that,
Described predetermined interval is begin further to be divided into to the interval that metering finishes interval arbitrarily a plurality of intervals from metering.
6. an injection moulding machine has injection cylinder; Rotatable and the screw rod that can be provided with in this injection cylinder with advancing and retreat; Rotation drives 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 the predetermined interval; The screw rod that detects the screw rod amount of retreating in the predetermined interval retreats amount detection unit; Supply with the resin material feed unit of resin material in injection cylinder, described injection moulding machine is characterised in that,
Has resin quantity delivered regulon, it regulates the resin quantity delivered of described resin material feed unit, so that become predetermined target value by the detected screw rod rotation amount of described screw rod rotation amount detecting unit divided by retreat the value that the detected screw rod of the amount detection unit amount of retreating obtains by described screw rod.
7. injection moulding machine according to claim 6 is characterized in that,
Also have the desired value setup unit, its detected screw rod rotation amount of described screw rod rotation amount detecting unit that passes through when completely supplying with compacted under is set at described predetermined target value divided by retreat the value that obtains with predetermined hungry coefficient on duty that the detected screw rod of the amount detection unit amount of retreating obtains by described screw rod.
8. injection moulding machine according to claim 6 is characterized in that,
Described predetermined target value is the value that the operator sets.
9. injection moulding machine according to claim 6 is characterized in that,
Described predetermined interval is to begin to the interval of metering end from metering.
10. injection moulding machine according to claim 6 is characterized in that,
Described predetermined interval is begin further to be divided into to the interval that metering finishes interval arbitrarily a plurality of intervals from metering.
CN201110133991.7A 2010-06-21 2011-05-19 Injection molding machine having resin supply quantity adjusting unit Active CN102285067B (en)

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CN102285067B (en) 2014-07-16

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