CN101362372A - Injection pressure molding method - Google Patents
Injection pressure molding method Download PDFInfo
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- CN101362372A CN101362372A CNA2008101298436A CN200810129843A CN101362372A CN 101362372 A CN101362372 A CN 101362372A CN A2008101298436 A CNA2008101298436 A CN A2008101298436A CN 200810129843 A CN200810129843 A CN 200810129843A CN 101362372 A CN101362372 A CN 101362372A
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Abstract
The invention provides an injection pressure forming method, which solves the problem that air remained in a cavity cannot be quickly discharged from a tiny vent hole between parting surfaces in injection pressure forming, so that good injection filling cannot be realized; and a problem that solid matter contained in the gas adheres to a gap of the mold or a vent hole to block the vent hole or to narrow the vent hole. In the injection pressure molding method, a molten resin is injected from an injection device (3) in a state where a movable mold (22) is slightly separated from a fixed mold (40), and the injection of the molten resin is started in a state where a cavity (36) is opened to the outside and is not completely formed.
Description
Technical field
The present invention relates to a kind ofly a little under the state away from the fixing metal mould, penetrate the injection pressure forming method of molten resin from injection device at movable metal pattern.
Background technology
Injection pressure forming method is a little under the state away from the fixing metal mould, to penetrate the manufacturing process of molten resin at movable metal pattern from injection device.Therefore, for injection pressure forming method, even the such thin formed products of LGP, the end that is filled into away from cast gate (gate) is injected well with molten resin in the flow losses ground that also can reduce in the chamber.And, compare with the situation of filling to narrow at interval chamber injection by injection moulding, because injection pressure forming method can compare low speed, low pressure ground injecting molten resin, so, the injection device that does not need to have the high speed injection ability.And, common injection moulding is at the type of cutting off cast gate, can't behind gate cutting, implement pressure and keep, and injection pressure forming method pressurizes to the molten resin in the chamber behind gate cutting, has the advantage that can tackle the contraction that causes because of cooling curing by injection device.
But, because injection pressure forming method the time has enlarged the volume in the chamber in injection, so, the amount of the air that must discharge in the chamber because of the injection of molten resin is more than common injection moulding.Usually in injection pressure forming method, the air in the chamber is discharged to the metal pattern outside from passage or the minim gap between the metal pattern that is arranged at die joint.But even owing to be provided with aforementioned passage, the air of discharging in the chamber also can partly be subjected to flow resistance and can not discharge rapidly at passage, so, exist the problem that the pace of the molten resin in the chamber reduces.And, if increase passage, then exist molten resin and enter aforementioned passage and produce burr and the bad problem of the depth of parallelism in order to address this problem.In addition, also have carrying out the method for vacuum attraction in the chamber, but owing to make become large-scale, cost of device promote, and after forming chamber, need to be used to carry out the over head time of vacuum attraction, so, exist the problem of forming period time lengthening.
Therefore, in existing injection pressure forming method, if as the chamber thickness 4mm of the thickness of slab 1.2mm that adopts patent documentation 1 record, patent documentation 2 records, and patent documentation 3 do not form thin formed products the record, then might cause lack of fill in end away from cast gate.And, in existing injection pressure forming method, there is following problems: even molten resin is sent to the end of chamber, finished shaping, during injection and the gas that transmits simultaneously of molten resin also can force to enter into gap between passage or metal pattern from chamber, as a result, make the solid content that contains in the gas be attached to aforementioned gap or passage, can cause passage etc. to get clogged.Therefore, have to the each several part of metal pattern is decomposed, carry out cleaning work continually.
Patent documentation 1: the spy opens 2000-218654 communique (0024, Fig. 1)
Patent documentation 2: the spy opens 2000-233428 communique (0007, table 1, table 2)
Patent documentation 3: the spy opens 2003-145593 communique (0001, Fig. 1)
Summary of the invention
The present invention proposes in view of the above problems, its purpose is to provide a kind of injection pressure forming method, be used at movable metal pattern a little under the state away from the fixing metal mould, penetrate the injection pressure forming method of molten resin from injection device, solve following problems: the chamber that forms face and movable metal pattern because of the chamber of fixing metal mould during injection forms the interval of the face pressure loss when narrow, causes injecting the molten resin deficiency that is filled into the chamber end; Or can not discharge fast from the minute ventilation between the die joint because of the air that remains in the chamber, cause that the flow velocity of the molten resin that penetrates is weakened etc. in chamber and the injection lack of fill that causes.And, the present invention also aims to provide a kind of injection pressure forming method that can solve following problems, that is: and the gas that transmits simultaneously of molten resin force to enter into gap between passage or metal pattern from chamber, the result, make the solid content that contains in the gas be attached to aforementioned gap or passage, cause passage etc. to get clogged or become narrower.
The injection pressure forming method that technical solution of the present invention 1 is put down in writing, movable metal pattern relative fixed metal pattern a little away from state under, penetrate molten resin from injection device, it is characterized in that, under the state that chamber open, is not completed into to the outside, begin the injection of molten resin.And technical solution of the present invention 2 proposes according to technical scheme 1, it is characterized in that; detect the position of movable metal pattern; die opening and closing/clamping is controlled, made movable metal pattern move to chamber and open and the position that is not completed into, the injection of beginning molten resin to the outside.And technical solution of the present invention 3 proposes according to technical scheme 2, it is characterized in that, behind the molten resin start injection, based on set triggering, movable metal pattern is moved to the fixing metal mould.And then, technical solution of the present invention 4 is according to any proposition in technical scheme 1～technical scheme 3, it is characterized in that, use following movable metal pattern, described movable metal pattern have chamber form face the core body piece around can dispose movable frame portion with advancing and retreat, in movable frame portion, be formed with die joint with the die joint butt of fixing metal mould.
For injection pressure forming method of the present invention, since movable metal pattern relative fixed metal pattern a little away from state under, from the injection pressure forming method that injection device penetrates, start injection under the state that chamber is opened, is not completed into to the outside, so, the indoor air of discharge side easily is even if thin formed products such as LGP also can be injected well and be filled into the chamber end.And, be when producing the type of gas at employed resin, can eliminate that the solid content that contains in the gas is attached to the gap of metal pattern or passage and the problem of blocking passage etc.
Description of drawings
Fig. 1 is the front view of the employed injection pressure forming machine of the injection pressure forming method of present embodiment.
Fig. 2 is the horizontal cross of the LGP of present embodiment with the injection pressure metal pattern, is the state diagram that the movable metal pattern of expression stops at the injection starting position.
Fig. 3 is the horizontal cross of the LGP of present embodiment with the injection pressure metal pattern, is the state diagram when beginning again mold closing after the expression injection beginning.
Fig. 4 is the horizontal cross of the LGP of present embodiment with the injection pressure metal pattern, the state diagram when being expression pressurization end.
Fig. 5 is the front view of the LGP of present embodiment with the movable metal pattern of injection pressure metal pattern.
Fig. 6 is the vertical view of the LGP of present embodiment with the injection pressure metal pattern, is the figure of expression die opening state.
Fig. 7 is the side view of the LGP of present embodiment with the injection pressure metal pattern, is the state diagram that the movable metal pattern of expression stops at the injection starting position.
Fig. 8 is the flow chart of the injection pressure forming method of present embodiment.
Description of reference numerals
1 injection pressure forming machine
10 clamping pressure cylinders (die opening and closing/clamping)
11 position sensors
12 controllers
21 LGPs injection pressure metal pattern
22 movable metal patterns
24 core body pieces (core block)
28,29 springs
30 first movable frame portions
30a, 31a, 46a die joint
31 second movable frame portions
36 chambers
40 fixing metal moulds
46 butt pieces
The D gap
The M molten resin
The P1 LGP
The specific embodiment
With reference to Fig. 1～Fig. 8, injection pressure forming method of the present invention is described.Fig. 1 is the front view of the employed injection pressure forming machine of the injection pressure forming method of present embodiment.Fig. 2 is the horizontal cross of the LGP of present embodiment with the injection pressure metal pattern, is the state diagram that the movable metal pattern of expression stops at the injection starting position.Fig. 3 is the horizontal cross of the LGP of present embodiment with the injection pressure metal pattern, is the state diagram when movable metal pattern begins mold closing again after the expression injection beginning.Fig. 4 is the horizontal cross of the LGP of present embodiment with the injection pressure metal pattern, the state diagram when being expression pressurization end.Fig. 5 is the front view of LGP with the movable metal pattern of injection pressure metal pattern.Fig. 6 is the vertical view of LGP with the injection pressure metal pattern, is the figure of expression die opening state.Fig. 7 is the side view of LGP with the injection pressure metal pattern, is the state diagram that the movable metal pattern of expression stops at the injection starting position.Fig. 8 is the flow chart of the injection pressure forming method of present embodiment.
As shown in Figure 1, the employed injection pressure forming machine 1 of the injection pressure forming method of present embodiment disposes injection device 3 on support (bed) 4, and this injection device 3 possesses cartridge heater 2a and the nozzle 2b that is built-in with screw rod.Injection device 3 is by the injection servo motor control of the metering of not shown metrological service with servo motor and injection mechanism, and screw speed, screw position are detected by the rotary encoder of aforementioned metering with servo motor, injection servo motor.Mold closing mechanism 5 the fixed disk 6 that is fixed in support 4 and be disposed at support 4 be subjected to dispose four connecting rods 8 between the platen 7, movable plate 9 can be inserted movably to be led on aforementioned connecting rod 8.And, be subjected to dispose on the platen 7 die opening and closing/clamping of carrying out die opening and closing and matched moulds, be clamping pressure cylinder 10 that the piston 10a of aforementioned clamping pressure cylinder 10 is fixed on the back side of movable plate 9.And, speed, mold clamping force by as the clamping pressure cylinder 10 control mold closings of die opening and closing/clamping the time.In the present embodiment, as die opening and closing/clamping, for example understand situation, but also can be the elbow-bar mechanism of under the effect of servo motor and ball screw framework etc., moving by the clamping pressure cylinder 10 of servo valve control.And present embodiment is illustrated the injection pressure of carrying out die opening and closing in the horizontal direction, but also can carry out die opening and closing in vertical direction.
In addition, the position sensor 11 that detected by the position (position that is equal to movable metal pattern) of platen 7 to movable plate 9 is installed on injection pressure forming machine 1, aforementioned location sensor 11 is connected with controller 12.Controller 12 is connected with the hydraulic circuit that the clamping pressure cylinder 10 to die opening and closing/clamping of servo valve, pressure sensor etc. is controlled.Therefore, in injection pressure forming machine 1, can detect the position of movable metal pattern 22, clamping pressure cylinder 10 is carried out FEEDBACK CONTROL.And as mentioned above, the injection servo motor of controller 12 and injection device 3 and metering are connected with the temperature sensor of the rotary encoder of motor, servo amplifier, cartridge heater etc.Therefore, in injection pressure forming machine 1, can realize FEEDBACK CONTROL to screw position, screw rod pace and the screw speed of injection device 3, cartridge heater temperature etc., thus the pressure when controlled injection speed, pressurize switching position, pressurize, injection volume etc.Wherein, position sensor 11 can be installed between fixed disk 6 and the movable plate 9, perhaps also can be installed between fixing metal mould 40 and the movable metal pattern 22, can be contact or contactless in any one.
The LGP of the present embodiment of Fig. 2～shown in Figure 7 is with injection pressure metal pattern 21, is that to form two diagonal-size simultaneously by injection pressure forming method be that 3 inches, thickness of slab are the metal pattern of the portable phone of 0.3mm with LGP.At first, movable metal pattern 22 is described.Movable plate 9 sides at the metal pattern main part 23 of movable metal pattern 22 are equipped with thermal insulation board 39.And, on metal pattern main part 23, be fixed with the core body piece 24,24 that has formed chamber formation face 24a in front.And aforementioned cavity forms face 24a and becomes the pattern formation face that forms pattern transferring on LGP P1.Aforementioned core body piece 24 together is fixed in metal pattern main part 23 with the runner blocks 25 that is formed with runner (runner) formation face 25a, and gate cutting parts 26,26 can be installed between the two forward-reverse.In addition, the central authorities in runner blocks 25 can be equipped with push rod 27 forward-reverse.And, be formed with cooling medium stream 37 in the inside of core body piece 24, be formed with cooling medium stream 38 according to the mode of surrounding aforementioned push rod 27 in the inside of runner blocks 25.And, as special expression among Fig. 5, Fig. 6, the first movable frame portion 30, the second movable frame portion 31 are installed on the metal pattern main part 23 by spring 28,29 respectively, are configured to relatively move with respect to aforementioned core body piece 24, the first movable frame portions 30, the second movable frame portion 31.
As shown in Figure 5, the first movable frame portion 30 of present embodiment is arranged on away from cast gate one side, forms the incidence surface of LGP P1.Therefore, obtain the LGP of the present embodiment of two LGP P1 at the same time and use in the injection pressure metal pattern, the first movable frame portion 30 is arranged on the both sides of movable metal pattern 22.But, when in metal pattern, being shaped a LGP simultaneously, only at a square one-tenth.And the second movable frame portion 31 is formed for forming the side up and down of chamber 36 of LGP P1 and the side up and down of runner P2.Therefore, be set at the left and right sides among Fig. 5 respectively.And as shown in Figure 6, the stroke of the spring 28 of the first movable frame portion 30 is approximate consistent with the path increment that the movable metal pattern 22 in injection beginning back advances.In the present embodiment, the spring 28 contractile actual effect strokes of the first movable frame portion 30 are 0.3mm.And the spring 29 contractile actual effect strokes of the second movable frame portion 31 are 1.3mm, and are longer than the actual effect stroke of the spring 28 of the first movable frame portion 30.Therefore, as shown in Figure 6, the die joint 31a of the second movable frame portion 31 is more outstanding to fixing metal mould 40 than the die joint 30a of the first movable frame portion 30 during die sinking.In addition, LGP with injection pressure metal pattern 21 in, the elastic force approximately equal when making aforementioned spring 28 and spring 29 shrink aforementioned actual effect path increment is to wish to prevent to spill resin between die joint 30a, 46a and die joint 31a, 46a.
In addition, the first movable frame portion 30 is chimeric in the inboard to have incidence surface to form piece 34, and the incidence surface that is formed piece 34 by aforementioned incidence surface forms the incidence surface that the 34a of portion forms LGP P1.And aforementioned incidence surface forms the face of the fixing metal mould side of the piece 34 and the first movable frame portion 30, forms the die joint 30a with fixing metal mould 40 butts described later.And, the medial surface of the core body piece side of the second movable frame portion 31, the side that forms LGP P1 forms the side formation face 31c of face 31b and runner, and the front of fixing metal mould side forms die joint 31a.And between core body piece 24 and the first movable frame portion 30 and the second movable frame portion 31, be used to spray the air flue 35 of air when being formed with somatotype.
Then, fixing metal mould 40 is described.As Fig. 2～shown in Figure 4, be installed in fixing metal mould 40 on the fixed disk 6 of injection pressure forming machine 1 and form piece 42, intercalation piece 43, sprue bush 44, gate cutting parts 45, butt piece 46 etc. by metal pattern main part 41, chamber and form.And the fixed disk side at metal pattern main part 41 is equipped with thermal insulation board 47, and is formed with the hole of the nozzle of not shown inserted injection device, and locating ring is installed around it.In the movable metal pattern side of metal pattern main part 41 chamber is installed and forms piece 42, this chamber forms piece 42 forms face 42a with movable metal pattern 22 opposed chambers becomes pattern and forms face.And the inside that forms piece 42 at this chamber is formed with cooling medium stream 49.And be formed with air flue 48 according to the mode on every side of surrounding chamber formation piece 42.And in the present embodiment, chamber forms piece 42 and butt piece 46 roughly forms same, butt piece 46 become die joint 46a with movable metal pattern 22 opposed faces.
And, on metal pattern main part 41, dispose chamber and form piece 42 and intercalation piece 43.Intercalation piece 43 disposes sprue bush 44, and this sprue bush 44 is provided with in the central portion of intercalation piece 43 hole towards movable plate side enlarged-diameter.And, around sprue bush 44, be formed with the cooling medium stream 50 that runner P2 and running channel P3 are cooled off.In addition, form face towards chamber, being formed with runner with movable metal pattern 22 opposed faces and forming face 43a at intercalation piece 43 from the front end of sprue bush 44.
Then, according to the flow chart of Fig. 8, manufacturing process of the present invention is described.In the present embodiment, be that 3 inches, thickness of slab are the LGP P1 of 0.3mm with 4.4 seconds forming period time shaping diagonal-size.Its detailed content is 1.4 seconds die opening and closing time (comprising take-off time), 0.1 second inject delay time, 0.05 second inject time, 0.45 second dwell time, 2.4 seconds cool times (cool off from injection in fact and begin).Before beginning shaping, set the origin position of position sensor 11.For the origin position A5 of position sensor 11, by movable metal pattern 22 relative fixed metal patterns 40 are advanced, on the basis of butt between all die joint 30a, 31a, the 46a, make spring 28,29 shrink, the first movable frame portion 30 and the second movable frame portion 31 are retreated, and the forefront set positions that core body piece 24 is advanced is an initial point.Then, when being shaped, at first make clamping pressure cylinder 10 actions, allow movable plate 9 and movable metal pattern 22 begin to move, carry out mold closing from die sinking completing place A1 as die opening and closing/clamping.At this moment, be sent to controller 12, carry out the FEEDBACK CONTROL of clamping pressure cylinder 10 by not shown servo valve by the movable plate 9 of position sensor 11 detections and the position of movable metal pattern 22.Then, based on the control of clamping pressure cylinder 10 after the high speed mold closing is transferred to the low speed mold closing, the die joint 31a of the second movable frame portion 31 of movable metal pattern 22 shown in Figure 7 is with the die joint 46a butt of the butt piece 46 of fixing metal mould 40.At this moment,, the die joint 30a of the first movable frame portion 30 is provided with, so butt simultaneously owing to moving back to the movable plate rear flank than the die joint 31a of the second movable frame portion 31.
And then clamping pressure cylinder 10 continues action, and in the direction application of force of shrinking, movable plate 9 has advanced about 1.0mm at the spring 29 between metal pattern main part 23 that makes movable metal pattern 22 and the movable frame portion 31.Then, when position sensor 11 detects movable plate 9 and movable metal pattern 22 and arrived Fig. 2 and injection starting position A2 shown in Figure 7, temporarily stop clamping pressure cylinder 10.At this moment, clamping pressure cylinder 10 is only to be located in injection starting position A2 under the mold closing direction has applied the state of mold clamping force.Injection starting position A2 is that the chamber that the chamber of movable metal pattern 22 forms face 24a relative fixed metal pattern 40 forms face 42a, a little from pressurization end position A4 away from the position, in the present embodiment away from 0.3mm.Then, with this state, between the die joint 46a of the butt piece 46 of the die joint 30a of the first movable frame portion 30 of movable metal pattern 22 and fixing metal mould 40, also formed the clearance D of 5 μ m.Therefore, at injection A2 place, starting position, a side of chamber 36 is opened to the outside respectively, is in the state that is not completed into chamber 36.(be not via passage by opening, but between die joint 30a, the 46a fully butt ground by open.) this injection aforementioned die joint 30a at A2 place, starting position and the clearance D of aforementioned die joint 46a, as long as the gas of the interior molten resin M of chamber is fully discharged.Therefore, for example in being equivalent to 2～5 inches small-sized light conducting plate P1, can be 5～10 μ m.In addition, in less than the scope of 5 μ m, can't fully realize gas discharge effect, and in the scope greater than 10 μ m, because the length of the resin flows direction of chamber 36 is short when being small-sized light conducting plate P1, so, clearance D need be expanded to more than necessity, thus not preferred.In addition, for example in being equivalent to 30～50 inches large-scale light diffusing sheet, preferably aforementioned gap D is made as 10～20 μ m.
Then, passing through 0.1 second inject delay after the time, injection device 3 actions, beginning to inject.In addition, except present embodiment, also can work as movable metal pattern in moving when being in the both allocations that are not completed into chamber, start injection.In the present embodiment, the molten resin M of injection is a Merlon, and the design temperature of the front portion of cartridge heater 2a is set as 340～380 ℃.And, because injection speed is different because of formed products, so, cannot treat different things as the same, be preferably 100～400mm/sec.Wherein, be in the LGP of 0.2～0.4mm at thickness of slab, be preferably more than the 300mm/sec.If injection speed is too fast, then might be before the clearance D locking of chamber 36, molten resin has arrived clearance D.Then, advanced both quantitative if the sensors such as rotary encoder by the injection servo motor detect the screw position of injection device 3, and send it to controller 12, then send signal to clamping pressure cylinder 10 from aforementioned controller 12, as shown in Figure 3, beginning is based on the mold closing again of movable metal pattern 22, makes aforementioned die joint 30a and aforementioned die joint 46a butt.Wherein, the moment that begin based on the mold closing again of clamping pressure cylinder 10 this moment is because of size, the shape of formed products, the kind of resin, temperature, differences such as injection speed, but 30～60% the position of preferably having advanced from the injection starting position to the injection stroke of pressurize switching position relatively.And; the triggering that begins as mold closing again; except the detected value of when injection screw position, can also utilize from the injection beginning based on the timing of timer, the detected value etc. of detected value, the force cell that is arranged at die opening and closing/clamping or connecting rod or strain transducer of resin pressure sensor in the chamber.
The present invention can make air residual in the chamber 36 escape from the aforementioned gap D wideer than passage by carrying out aforementioned control.And, in the present invention, begin by carrying out again mold closing with the set moment midway in injection, molten resin M is flowed out to the outside from the open portion of chamber 36.And, especially at the injection initial stage, because pressure can not rise in the air in the chamber 36, so molten resin M can flow to the end of chamber 36 under the state that flow velocity does not reduce.In addition, can eliminate the solid content that contains in the gas is attached to air flow circuit 35,48 etc. and has blocked the gap of air flow circuit 35,48 etc. or the problem of passage etc.
And, after injection beginning, for the toold closing speed when closing aforementioned gap D, also be favourable when after locking chamber 36, molten resin M being pressurizeed under the situation at a high speed, the moment that mold closing is begun postpones, and reduces the air capacity in the chamber 36.But, in electronic elbow-bar mechanism, be difficult to improve the rate of climb of die opening and closing/clamping, flow to clamping pressure cylinder 10 by the oil that will be accumulated in the accumulator in the present embodiment, realized the high speed mold closing.And, be made as by the time (rate of rise) that will arrive maximal pressure in the present embodiment and rose in 0.03 second, can be to carry out mold closing at a high speed.Wherein, the value of the rate of rise of preferred this moment is to rise in 0.02～0.05 second.This moment, the peak of toold closing speed also depended on the setting value of formed products and interval D, but was preferably 5～40mm/sec.Then, chamber 36 is by complete atresia, and the resin pressure in the chamber 36 after preferably boosting is 25～80MPa.When wanting to eliminate the bump that causes because of the butt between die joint 30a, the 46a, can after aforementioned die joint 30a, 46a butt, formation chamber 36, boost rapidly.
Then, as shown in Figure 8, after movable metal pattern 22 passes through from the chamber locked position of coupler A3 of aforementioned die joint 30a and aforementioned die joint 46a butt based on the driving of clamping pressure cylinder 10, and then move, to the chamber 36 interior molten resin M compression of pressurizeing rapidly towards fixing metal mould 40.On the other hand,, then switch to pressure control, carry out pressurize from the pressurize switching position if advance, finished injection at injection device 3 side screw rods.Then, with the set moment gate cutting parts 26 are advanced, carry out separating of LGP P1 and runner P2 in the metal pattern side.After cut-out with one voice based on gate cutting parts 26, pressurize from injection device 3 can be to not impacting in the chamber 36, can pressurize by the molten resin M in 10 pairs of chambers of clamping pressure cylinder 36, especially in the shaping of carrying out the transfer printing as LGP P1, even there is the contraction that causes because of cooling, can not produce badly yet, can realize that good transfer printing is shaped.
Then, action by clamping pressure cylinder 10, the core body piece 24 that makes movable metal pattern 22 is from the injection starting position A2 0.3mm that advances, when the spring 28,29 of the first movable frame portion 30, the second movable frame portion 31 shrinks fully, when reaching pressurization end position A4 shown in Figure 4, having formed thickness of slab is the LGP P1 of 0.3mm.During this period, in the be shaped metering of employed molten resin of injection device 3 sides next time.In addition, though diagram not, if through both constantly between, the Compressed Gas of carrying somatotypes to use to chamber 36 from the air flue 48 of fixing metal mould 40 then.
Then, make 10 actions of clamping pressure cylinder, remove pressure, die sinking in order.If remove pressure, then the spring 28,29 in the movable metal pattern 22 sides first movable frame portion 30, the second movable frame portion 31 extends once more, and metal pattern main part 23, core body piece 24 and runner blocks 25 are advanced relatively respectively for the first movable frame portion 30, the second movable frame portion 31.Then, movable metal pattern 22 and movable plate 9 turn back to injection starting position A2 from pressurization end position A4.Then, if carry out die sinking next time, then LGP P1, runner P2 and running channel P3 are removed with the state that remains on movable metal pattern 22 sides respectively, and A1 moves to the die sinking end position.And, approximate simultaneously via the 35 ejection compressed air of the air flue between core body piece 24 and the first movable frame portion 30 and the second movable frame portion 31.Then, at die sinking end position A1, the push rod 27 of liftout attachment advances, and carries out runner P2 forms face 25a from runner somatotype.And, at die sinking end position A1, take out LGP P1, runner P2 and running channel P3 with manipulator by not shown taking-up.Though do not illustrate, the employed taking-up of present embodiment is controlled running channel P3 etc. with manipulator by chuck, and, they are taken out from movable metal pattern 22 by sucker absorption LGP P1.And, under the progressive forming because of LGP P1 makes the situation of LGP with 21 thermal expansions of injection pressure metal pattern, the origin position A5 of preferred correction position sensor 11 or correction chamber locked position of coupler A3.
Can not enumerate one by one at the present invention, be not limited to above-mentioned present embodiment, those skilled in the art's purport according to the present invention has applied the content of change, also belongs to scope of the present invention certainly.For example, for formed products,, then do not select kind, purposes if be difficult to the sheet moulding article that is shaped by common injection machine.For example and then can be big LGP, light diffusing sheet, lens, disc board and windows of vehicles etc. of size (area).And, be that the shaping of the small-sized light conducting plate (being equivalent to diagonal-size is 2.5～6 inches) of 0.1～0.3mm or disc board, the thickness of slab formed products that to be the medium-sized LGP of 0.3～0.5mm or diffuser plate (being equivalent to diagonal-size is 6～15 inches) etc. be difficult to be shaped by existing injection pressure forming is especially effective wherein to thickness of slab.
And, for example can also from running channel towards the formed products of the drop gate of complete cycle injecting molten resin or when after complete cycle has been injected molten resin, forming the shaping of disc board of centre bore from running channel, the die joint of the die joint that makes the fixing metal mould and movable metal pattern according to fully not butt and chimeric mode away from, wholely around the chamber injected to outside opened state.If this point is further specified, then by control die opening and closing/clamping, the die joint that makes movable metal pattern and the die joint of fixing metal mould be interval 5～20 μ m only, according to anywhere not the mode of butt stop.Then, at injection beginning back compression molten resin, and, before spraying aforementioned molten resin, make die joint against each other from the gap between the die joint.
In addition, the first movable frame portion, 30 integral body become die joint 30a in the present embodiment, action locking by clamping pressure cylinder 10 with the clearance D of the die joint 46a of fixing metal mould 40, even but the width of the die joint of injection beginning back butt be narrower, be the part about 1mm, also have enough air and discharge effect.And, except die opening and closing/clamping, also can piece be moved by the actuators such as hydraulic cylinder that are arranged at metal pattern, locking is used for the gap of the indoor air of discharge side.
Claims (4)
1. injection pressure forming method, movable metal pattern relative fixed metal pattern a little away from state under, penetrate molten resin from injection device, it is characterized in that,
The injection of beginning molten resin under the state that chamber is opened, is not completed into to the outside.
2. injection pressure forming method according to claim 1 is characterized in that,
Detect the position of movable metal pattern, die opening and closing/clamping is controlled, make movable metal pattern move to chamber and open and the position that is not completed into, the injection of beginning molten resin to the outside.
3. injection pressure forming method according to claim 2 is characterized in that,
Behind the molten resin start injection, based on set triggering, die opening and closing/clamping is controlled, movable metal pattern is moved to the fixing metal mould.
4. injection pressure forming method according to claim 1 is characterized in that,
Use following movable metal pattern, described movable metal pattern have chamber form face the core body piece around can dispose movable frame portion with advancing and retreat, in aforementioned movable frame portion, be formed with die joint with the die joint butt of fixing metal mould.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007208526 | 2007-08-09 | ||
| JP2007208526 | 2007-08-09 | ||
| JP2008144265 | 2008-06-02 |
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| CN101362372A true CN101362372A (en) | 2009-02-11 |
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| CNA2008101298436A Pending CN101362372A (en) | 2007-08-09 | 2008-08-07 | Injection pressure molding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105383021A (en) * | 2014-08-25 | 2016-03-09 | 株式会社名机制作所 | Injection compression molding machine, support plate thereof, and compression molding metal mold |
| CN110815719A (en) * | 2018-08-08 | 2020-02-21 | 扬明光学股份有限公司 | Injection molding die and method for manufacturing high polymer material element |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103561931B (en) * | 2011-06-16 | 2016-04-06 | 东丽株式会社 | The manufacture method of fibre reinforced plastics |
| CN117445307A (en) * | 2023-11-07 | 2024-01-26 | 东莞福众塑胶模具制品有限公司 | Plastic injection mold and method thereof |
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2008
- 2008-06-02 JP JP2008144265A patent/JP2009061767A/en active Pending
- 2008-08-07 CN CNA2008101298436A patent/CN101362372A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105383021A (en) * | 2014-08-25 | 2016-03-09 | 株式会社名机制作所 | Injection compression molding machine, support plate thereof, and compression molding metal mold |
| CN110815719A (en) * | 2018-08-08 | 2020-02-21 | 扬明光学股份有限公司 | Injection molding die and method for manufacturing high polymer material element |
| TWI769288B (en) * | 2018-08-08 | 2022-07-01 | 揚明光學股份有限公司 | Mold for injection molding and method of manufacturing polymer material component |
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| JP2009061767A (en) | 2009-03-26 |
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