CN1611342A

CN1611342A - Motor-driven injection-moulding apparatus

Info

Publication number: CN1611342A
Application number: CN 200310104630
Authority: CN
Inventors: 硲修一
Original assignee: Daiwa Kasei Industry Co Ltd
Current assignee: Daiwa Kasei KK; Daiwa Kasei Industry Co Ltd
Priority date: 2003-10-31
Filing date: 2003-10-31
Publication date: 2005-05-04
Anticipated expiration: 2023-10-31
Also published as: CN100443284C

Abstract

The present invention provides an injection moulding equipment which is driven by motor and whose whole body is simplified and structure is compact. In said equipment a movable metal mold clamped no a fixed metal mold can be mounted on a movable mold plate, and two ball screw rods used for moving said movable mold plate are passed through two positions on the relative diagonal portions of said movable mold plate, and every end portion of said ball screw rod is made into a cantilever form, and is driven by belt roller and a synchronous belt so as to can make the movable mold plate be moved. Besides, said injection moulding equipment also comprises a slide guideway, a supporting unit, a clamping device and an injection plunger piston, etc.

Description

Electric motor driven injection molding machine

Technical field

The present invention relates to the electric motor driven injection molding machine that a motor wherein opens and closes the material of metal pattern, injection fusing and unloads the good product of lower mould.

Background technology

In general, an injector opens and closes metal pattern by one and opens and closes mechanism, fusing with the metal pattern that clamps metal pattern and want molded material bead or materials similar with the injection mechanism injected and a driving mechanism of these mechanisms of transmission automatically.It is a kind of with the mechanism of high pressure clamping metal pattern with the realization mold cramping that metal pattern opens and closes mechanism, and its mold cramping type more broadly can be divided into crank connecting link type and direct hydraulic type, last type opens and closes metal pattern and clamping mold by a toggle, and back one type is then by the direct clamping mold that is used for of hydraulic cylinder or analog.

Summary of the invention

In this case, the electric motor driven injection molding machine of crank connecting link type can produce higher molding pressure by toggle, but because this mechanism requires bigger space, so the molding equipment of most of crank connecting link types is large-sized.On the other hand, in the injection molding machine of a direct hydraulic type of the use hydraulic cylinder 401 as shown in Figure 11 A, because the space that is used for installing hydraulic cylinder 401, it is large-sized that this equipment itself also becomes.In addition, in the equipment of direct hydraulic type, known a kind of have with the ball-screw 301 as shown in Figure 11 B come the electric motor driven injection molding machine 300 of the structure of replacement liquid cylinder pressure 401.But, use the electric motor driven injection molding machine of the direct hydraulic type of ball-screw 301 to have following shortcoming.In this case, in Figure 11 A and 11B, the framework of label 305 and 402 expressions, one bearing plate.

Usually, be provided with four root system bars 303 in the template 302 that metal pattern is provided with (wherein two are being in addition in two the shade for opening and closing, be sightless), template 302 is moved along tie-rod 303 under the impetus of ball-screw 301, so that a metal pattern 304 can open and close.In addition, in the structure of the ball-screw of stating in the use 301, owing to need be used for ball-screw 301 from opening and closing the space S that mechanism or injection mechanism protrude out, so equipment is large-sized.

An object of the present invention is to provide a kind of electric motor driven injection molding machine, wherein the integral body of this electric motor driven injection molding machine can make lightweight and small-sized.

In order to realize above-mentioned purpose, according to the present invention, provide a kind of electric motor driven injection molding machine, it comprises:

One center fixation plate of one fixed mould of supporting metal pattern;

The one moveable die plate of one moveable die of supporting metal pattern, this moveable die plate movably be arranged to can near and leave the center fixation plate;

One rail plate, admit the moveable die plate a bottom and along near and the direction the left moveable die plate that leads slidably;

With the plurality of balls leading screw that the state of cantilever extends to the moveable die plate from the center fixed head, two positions of for example two ball-screws that are used to open and close mould, and two ball-screws on the relative bight of moveable die plate engage with the moveable die plate;

Be used to open and close a motor of mould, this motor rotates the ball-screw that is in cantilever position in the forward and backward directions, and makes the moveable die plate near center fixation plate and make the moveable die plate leave the center fixation plate; And

One motor that is used to inject, this motor is arranged in the side relative with the moveable die plate of relative center fixation plate, and relative with the mould opening and closing mechanism with said structure, this motor enters the resin driving of fusing in the metal pattern in a mold cramping state of fixed mould that forms to the close of fixed mold plate along with the moveable die plate and moveable die.

As mentioned above, because being the rail plate by the bottom of supporting moveable die plate, the moveable die plate leads, and cancelled traditional tie-rod (guide rod), so the quantity of part reduces, in the moveable die plate, also need not the part passed through for tie-rod, and suitable quantity is only arranged in relative bight, for example two ball-screws pass the moveable die plate.Therefore, can constitute the moveable die plate compactly, and the structure of this plate becomes simple.

In addition, because pass the ball-screw of moveable die plate, for example two ball-screws are with the form supporting of cantilever, so need not to be used for the end plate of rotating bearing ball leading screw end.Therefore, the quantity of part reduces further, and has cancelled end plate, and it is simple that structure becomes.In addition, owing to need not to be used to arrange the space of end plate, so that equipment becomes is more compact.The moveable die plate in this case, rotates with mobile moveable die plate via a belt pulley or similar part, so can have disadvantage ground to realize the opening and closing operation of mould owing to be in the ball-screw of cantilever position.In addition, although because ball-screw is to be in cantilever position to engage with the moveable die plate, so admit ball-screw by the moveable die plate.Therefore, ball-screw moves the moveable die plate, and the moveable die plate supports the end of the ball-screw of the state that is in cantilever, thereby both rely on mutually, and whereby, ball-screw and moveable die plate are realized collaboratively to the simplification of equipment and a compact structure.

In addition, as mentioned above, be used for the tie-rod of orienting roll ballscrew and ball-screw be set so that cancel the quantity that end plate reduces part,, and can realize a compact structure so that the structure of equipment can simplify synergistically with the state of cantilever by cancellation.As a result, reduced the private space of installing, and can increase the quantity that can be installed in the electric motor driven injection molding machine in the predetermined space.

Then, in having the electric motor driven injection molding machine of said structure, in the mold cramping operation in opening and closing mechanism, can survey a mold cramping stroke based on the variation in the load current value that is exclusively used in the motor that opens and closes mechanism.In this case, owing to do not use the sensor of the position that is used for surveying moveable die plate or like parts,, also can save down the labour who relocates sensor even the thickness of metal pattern changes.

On the other hand, can export the injection volume of controlling in the injection mechanism based on signal from a sensor of the filled state of the material that is used for surveying the die cavity that is molded into metal pattern.In this case, this sensor is arranged in the metal pattern, so that survey the charging amount of the material that is molded, and can control suitable injection volume based on this signal.Therefore, need not to use two sensors that comprise the sensor that is used to survey plunger movement amount or similar value and be used to survey the sensor of injection pressure, this is different with traditional equipment, and can realize the reduction of cost like this.

In addition, in injection mechanism, the spiral tube of a built-in plunger can be set in an injection-tube, it comprises: be used to stir a spiral tube of the material of wanting molded, it can be in a fixing position axial rotation along injection-tube; On a central axis of spiral tube, extend through and store a receiving opening of the moulding material of stirring; And insert and pass the plunger that this receiving opening is also injected the moulding material that stirs.In this case, the spiral tube is melted to one with moulding material and is suitable for molded temperature, and at once moulding material is stirred simultaneously, and afterwards, plunger is expelled to metal pattern with a suitable pressure with moulding material.Therefore, can be fast and implement injection technique effectively, and can make the injection mechanism compactness than common spiral-shaped structure.

In addition, two cover injection mechanisms are set to inject independently, in mould opens and closes mechanism, have two fixing metal moulds to be installed on the center fixation plate, and a movable die structure become by a slide mechanism and can slide on the direction perpendicular to the direction of motion of movable platen respectively on the position of assembling with two fixing metal moulds.Can carry out double color mold-making based on above-mentioned structure.In other words, by two fixing metal moulds being installed on the center fixation plate and being realized above-mentioned structure, even the electric motor driven injection molding machine according to the rotation of ball-screw of the present invention, as to be used for opening and closing mechanism also can carry out double color mold-making.In this case, as the slide mechanism of movable metal pattern, can use as the identical ball-screw of the slide mechanism of movable platen and other device.

In a kind of compound mode of above-mentioned two cover injection mechanisms, two cover mechanisms can be set to a master and primary side, and master can choose from following all compound modes with time side according to the moulding material that will use.These compound modes comprise: master in double color mold-making and time side both are compound modes of plunger-type, in master and time side one is a plunger-type and another is a compound mode of the screw type of built-in plunger, and master and time side both are compound modes of the screw type of built-in plunger.

According to the target shape of moulding material, moulded product or similarly factor determine that injecting method is according to plunger-type or according to the screw type of built-in plunger.Because plunger-type has a large amount of delay part and injection pressure loss big when injection, so it is difficult to inject the material of poor heat stability.

Therefore, when double color mold-making, as described above according to will with the moulding material screw type of coming combined plunger type and built-in plunger, can improve injection effectively.

The accompanying drawing summary

Fig. 1 is the stereogram of cutting open according to the part of an embodiment of electric motor driven injection molding machine of the present invention;

Fig. 2 illustrates one among Fig. 1 in the mode of amplifying to open the profile that amplifies with the part of closing organ;

Fig. 3 is the front view that a rail plate of a movable metal die plate is shown;

Fig. 4 A is the figure of the function of the explanation sensor that is used to control injection volume;

Fig. 4 B is the figure that continues the explanation of Fig. 4 A;

Fig. 5 is the figure of the operation of the electric motor driven injection molding machine in the key diagram 1;

Fig. 6 is the stereogram that is partly with otch that an embodiment of the electric motor driven injection molding machine among Fig. 1 is shown;

Fig. 7 is the partial plan layout that can realize a double-colored molded electric motor driven injection molding machine;

Fig. 8 is the figure of the molded operation of dichromatism of the electric motor driven injection molding machine in the key diagram 7;

The plane of Fig. 9 embodiment that to be nozzle that an injection mechanism wherein is shown open from the center-biased of equipment;

Figure 10 is the plane that an embodiment of the structure in the wherein further reduced graph 1 is shown;

Figure 11 A illustrates the front view of the embodiment of a traditional electric motor driven injection molding machine; And

Figure 11 B is the figure of continuity Figure 11 A.

The specific embodiment

Below with reference to accompanying drawings to being described according to embodiments of the invention.

Shown in Fig. 1 with corresponding one electric motor driven injection molding machine 1 (hereinafter being also referred to as equipment) comprising according to one embodiment of the invention: a framework 2 of the pedestal of forming device 1, be arranged on the center of equipment 1 and the borderline mould that is fixed on the center fixation plate 3 on the framework 2 and is arranged on fixed head 3 dividually by a standing part 4 opens and closes a mechanism's part 10 and an injection mechanism part 30.In addition, be used to drive that driving mechanism 50 and 50 that mould opens and closes mechanism's part 30 and injection mechanism part 10 is arranged on the inside of framework 2 and at the periphery of framework 2.

Mould opens and closes mechanism's part 10 and is provided with center fixation plate 3, and an opening and closing side movable platen 13 (moveable die plates) are arranged to be toward or away from center fixation plate 3.Opening and closing are sidewindered ballscrew 17 and are passed moveable die plate 13 with 18 in relative bight insertion.These parts are constructed as illustrated in fig. 2, insert to pass with a threaded section that ballscrew 18 is sidewindered in opening and closing by being threaded and be arranged in the moveable die plate 13 nut 21 (, being example just) that is used for ball-screw with ball-screw 18 because another ball-screw 17 has identical structure.

In addition, as shown in Figure 1, one opening and closing side motor 51 turns these opening and closing via a synchronous belt 56 that is used as a transmission mechanism and belt

human relations

55 and 55 and sidewinders ballscrew 18, and ball-screw 18 passes center fixation plate 3 (Fig. 2) via a bearing 22 insertions.In this case, open and close and to sidewinder ballscrew 17 and have identical structure.By drive motor, two ball-screws 17 rotate one another along identical direction with 55 via synchronous belt 56 and belt pulley 55 synchronously with 18, and whereby, moveable die plate 13 is center fixation plate 3 motions relatively just.

The moveable die plate (opening and closing the side movable platen) 13 that opens and closes in the mechanism 10 at mould can slide along a direction, and moveable die plate 13 is toward or away from center fixation plate 3 by a rail plate on this direction.Rail plate is provided with the track 15 and 16 and bearing 14 and 14 of two straight lines, two tracks 15 and 16 directions of motion along moveable die plate 13 are arranged on the upper surface of framework 2 and are parallel to each other, two bearings 14 and 14 are fixed on the both sides of the bottom of moveable die plate 13, and be configured to each bearing element 14 and be assemblied on rectilinear orbit 15 and 16, and motion in orbit.

As shown in Figure 3, each bearing element 14 is provided with along corresponding with the both sides of track 15 or 16 last ball groove and rolls with the ball 26 and 26 that moves, rolls with the ball 27 that moves and 27 and the ball keeper 28 and 28 that keeps ball 26 and 27 along ball groove down, track 15 and 16 is accepted the load of moveable die plate 13 via each ball 26 and 27, and each ball 26 and 27 rolls, with reduce with corresponding to moveable die plate 13 on track 15 and 16 motion and the friction that produces.

As shown in Figure 1, protrude out the ball-screw 17 in an outside (side relative) and 18 end is supported by an end plate from moveable die plate 13 with center fixation plate 3, but be arranged to the state of cantilever, so that this end is corresponding to the object that will the drive moveable die plate 13 that is threaded, thereby be supported.Belt pulley 55 recited above is installed on the end that is in cantilever position of each ball-

screw

17 and 18, the synchronous belt that motor 51 is driven and makes 13 motions of moveable die plate with two ball-

screws

17 and 18 that cantilever position rotates on belt pulley 55 and 55.Each ball-

screw

17 and 18 extends through two positions on the relative bight of moveable die plate 13, and the driving force that its structure is configured to ball-

screw

17 and 18 is applied on the moveable die plate 13 as far as possible equably.Motor 51 recited above is one to be used to open and close the motor of mould, it rotates the ball-screw that is in cantilever position on forward and backward directions, so that moveable die plate 13 is near center fixation plate 3 with make moveable die plate 13 leave center fixation plate 3.

Since the tie-rod (promptly not having guide rod) of guiding moveable die plate 13 is not set, thus need not to tie-rod is provided with targeting part (through hole or similar structure) in moveable die plate 13, and can make the shape of moveable die plate 13 less.For example, as shown in Figure 3, can realize one by the shape of the compactness that those parts (for example upper right portion of plate 13) that tie-rod extended through traditionally obtain is not set.Owing to guide rod is not set, just need not to be used for the end plate of supporting end.Although be provided with ball-

screw

17 and 18, but ball-screw is to drive with the state of cantilever by the end plate that cancellation is used for the end of rotating bearing ball leading screw, can realize that has whereby been cancelled electric motor driven injection molding machine end plate and guide rod, extremely simple and compact.

In moveable die plate 13, be equipped with a movable metal pattern 12, in center fixation plate 3, be equipped with a fixing metal mould 11.Movable metal pattern 12 utilizes the approaching clamping that realizes the mould between

metal pattern

11 and 12 of moveable die plate 13 with 13 motions of moveable die plate, and utilizes leaving of moveable die plate 13 to realize opening of mould.

As shown in Figure 1, injection mechanism part 30 be provided with center fixation plate 3, an injection side fixed head 34 and be arranged in center fixation plate 3 and injection side fixed head 34 between and the injection side movable platen 33 that can move vertically.In addition, two injection side tie-rods 35 and 36 insert and to pass injection side movable platen 33, and two injection side ball-

screws

37 and 38 also insert on relative bight and pass injection side movable platen 33.Injection side movable platen 33 is configured under the effect of an injection side motor 52, the rotation by injection side ball-

screw

37 and 38,

via belt pulley

57 and 57 and synchronous belt 56 move in the axial direction.

In this case, this structure can be configured to, injection side movable platen 33 by as shown in figs. 1 and 3 rail plate, be track 15 with 16 and the relative framework 2 of bearing element 14 that is assemblied in the track 15 and 16 with 14 lead.

The plunger 42 that is used for injection-molded material (resin) is fixed on a central axis of injection side movable platen 33, and axially is provided with plunger 42 and can admits a cylinder body 41 of plunger 42 to be disposed generally on the center of injection mechanism part 30.In other words, the injection mechanism part 30 of electric motor driven injection molding machine 1 is configured to by the plunger-type structure.A feed hopper 30 that is used for moulding material is fed into injection mechanism part 43 is arranged on the top of cylinder body 41, and is used for the heated mould prepared material to form the outer peripheral portion that is arranged on cylinder body for a heater 40 of the melting solid of injection.Plunger 42 be configured to can corresponding to injection side movable platen 33 in the axial direction motion and repeat a reciprocal motion.

In this case, this structure is configured to be expelled to the mould opening and closing mechanism part 10 from injection mechanism 30 via the material of center fixation plate 3 with fusing.

Driving mechanism part 50 and 50 in the both ends of the said equipment 1 is configured to, and the injection side motor 52 that is used to drive injection side ball-

screw

37 and 38 that opens and closes the opening and closing side motor 51 that

sidewinders ballscrew

17 and 18 and injection mechanism part 30 of being used to drive that opens and closes mechanism's part 10 is the inside that is assemblied in framework 2.

One sensor that is used to survey the load current value of this driving is set in opening and closing side motor 51.This sensor is set is used for being controlled at the stroke that opening and closing mechanism is used for mold cramping, and set a load current value corresponding to the motor 51 of mold cramping pressure, thereby set an injection SBR, this sensor stops the driving of motor 51 when obtaining a predetermined load current value.

As shown in Figure 4, the displacer 83 in movable metal pattern 12 is provided with a sensor 70 that is used to survey the charging quantity of the moulding material W that plunger 42 injected.In other words, in the mold cramping state shown in Fig. 4 A, because moulding material W also is not injected into, pressurize so be formed on the leading edge 73 that the 72 pairs of moulded products of a leaf spring (web spring) on the end face of sensor 70 protrude out pin 85, so that it protrudes into die cavity 74 slightly.Then, shown in Fig. 4 B, as plunger 42 injection-molded product W so that it is when being injected in the die cavity 74, moulded product protrudes out pin 85 and slightly moves based on the pressure of moulding material W, and leaf spring 72 strains roughly become a flat plate shape, and come in contact with sensor 70.In addition, this structure is configured to, and an injection side motor 52 (Fig. 1) is controlled injection volume based on the signal of the sensor 70 that is touched.

With reference to Fig. 5 the molded mechanism of electric motor driven injection molding machine 1 from mold cramping to injection with said structure is described below.In this case, Fig. 5 shows a figure who simplifies, and in order should be readily appreciated that, wherein to have saved the tie-rod in the injection mechanism side, and to have shown two ball-screws.

At first, in electric motor driven injection molding machine 1 in the stand-by state shown in Fig. 5 (d), ball-

screw

17 and 18 rotates according to the running that opens and closes side motor 51, whereby, this moveable die plate 13 moves near center fixation plate 3, and according to the motion of moveable die plate 13, movable metal pattern 12 enters just like the mold cramping state shown in Fig. 5 (a).Reach the end that a predetermined value is surveyed mold cramping by the load current value that opens and closes side motor 51.Then, in this state, come rotation

ball leading screw

37 and 38 by running injection side motor 52, injection side movable platen 33 is to 3 motions of center fixation plate whereby, and plunger 42 is in an identical manner near center fixation plate 3 motion, thereby is arranged to the inject state shown in (b) of Fig. 5.

In this case, injection side movable platen 33 is near the motion of center fixation plate 3 ground, and the moulding material that the sensor 70 (Fig. 4) in being arranged on movable metal pattern 12 detects in die cavity 74 fills end, thereby stops injection.

When sensor 70 sent out the signal of the filled end of expression, injection side motor 52 reversed the direction that drives, and plunger 42 as shown in Fig. 5 (c), thereby reaches a stand-by state with the close injection side fixed head 34 of injection side movable platen 33 motions.On the other hand, open and close side motor 51 and also after injection, reverse the direction that drives during through fixing retention time, movable metal pattern 12 just moves to the direction of opening with moveable die plate 13, thereby reaches the mould open mode shown in (c) of Fig. 5.

In this case, although saved a key diagram in Fig. 5, molded good product A unloads from die cavity based on the scheduled operation of a cylinder, and collects part 60 from one and collect molded good product.

Then, figure 6 illustrates an embodiment who revises of electric motor driven injection molding machine 1.In this case, structure and the mechanism identical with mechanism with the structure of electric motor driven injection molding machine 1 have put on identical label, and will omit description of them.In an injection mechanism part 130 of an electric motor driven injection molding machine 100, in a cylinder body 141, be formed for stirring a spiral tube 145 of moulding material.In addition, formed a receiving opening 146 that is used to store the moulding material of mixing to run through mode on the central axis of spiral tube 145, and plunger 142 is assemblied in the receiving opening 146 slidably, and be in a state that allows spiral tube 145 to rotate, thereby be configured to the screw type injection mechanism part 130 of a built-in plunger.In this case, spiral tube 145 is driven by the motor 53 that is arranged on framework 2 inside.

According to electric motor driven injection molding machine 100,, be melted effectively so this material is all even because the moulding material of being introduced from feed hopper 43 is melted by a heater 40 when being stirred by spiral tube 145 in cylinder body with said structure.In addition, in mobile plunger 142 backward, the material (resin) of fusing is stored in the receiving opening 146 in the leading edge that is formed on spiral tube 145, and the resin of the fusing in receiving opening 146 is injected in the metal pattern along with travelling forward of plunger 142.Rotate with fixing position and plunger 142 within it in the spiral-shaped structure of the proal built-in plunger of portion at spiral tube 145, plunger 142 moves forwards or backwards by means of above-mentioned injection side movable platen 33.Fig. 7 shows the electric motor driven injection molding machine 200 that can realize so-called double color mold-making, and it is provided with the injection mechanism part 30 of the electric motor driven injection molding machine 1 shown in two cover Fig. 1.Since it is so, structure and the mechanism identical with mechanism with the structure of electric motor driven injection molding machine 1 have put on identical label, and will omit description of them.The structure of equipment 200 is configured to, and in opening and closing mechanism's part 290, two fixing metal moulds that is a master fixing metal mould 220 and primary side fixing metal mould 221 has been installed, to carry out double color mold-making on center fixation plate 3.On the other hand, one movable metal pattern 210 is installed on the moveable die plate 13, and a metal pattern motion ball-screw 213 is arranged on the direction perpendicular to the direction of motion (axial direction) of movable platen 13, movable metal pattern 210 can slide along the direction of this ball-screw 213 by this ball-screw 213, and can and this sliding motion as one man be clamped in two

fixing metal moulds

220 and 221 each.

Metal pattern motion ball-screw 213 is rotated via metal pattern sports belt wheel 212 by a motor (not shown) that is exclusively used in it, and movable metal pattern 210 moves between the primary importance relative with master fixing metal mould 220 and the second place relative with inferior side fixing metal mould 221.

On the other hand, injection mechanism part 280 is provided with one and is used for being used for to the inferior side injection unit 240 of inferior side fixing metal mould 221 injection-molded materials to the master injecting unit 230 and of master fixing metal mould 220 injection-molded materials (resin of fusing), and two unit are all driven by identical structure and mechanism.Two

unit

230 and 240 have the injection side fixed

head

234 and 244 that is arranged on the end, respectively have two injection side ball-

screws

232 and 244 of being provided with accordingly relative to the bight, be separately positioned on its intersect relative to the tie-rod 231 in bight and 241 and according to the injection side

movable platen

233 and 243 that moves along tie-

rod

231 and 241 respectively that rotates of injection side ball-screw 232 and 242.In addition,

plunger

235 and 245 is assemblied in

movable platen

233 and 243, and

plunger

235 and 245 in the

cylinder body

236 and 246 of molten resin of storage moulding material along an axially-movable.In addition,

plunger

235 and 245 is selectively proal, and whereby, the resin of fusing just selectively is expelled to main or the second fixing metal mould.

Now the operation of this electric motor driven injection molding machine 200 is described with reference to Fig. 8.In the present embodiment, opening and closing mechanism and injection mechanism is by driving as the identical mechanism in electric motor driven injection molding machine 1.At first, as shown in Fig. 8 (a), master fixing metal mould 220 and movable metal pattern 210 are clamped.Survey the end of mold cramping by the load current value that opens and closes the side motor, this mode of operation with electric motor driven injection molding machine 1 is identical.Afterwards, the motion based on injection side movable platen 233 is expelled to master with the resin that melts from master injecting unit 230.Determine the end of injection molding by the sensor of the filled state of resin in die cavity that is used for surveying as described above fusing.When after the injection through after fixing retention time, injection side movable platen 233 and moveable die plate 13 move along the direction of opening, as shown in Fig. 8 (b).

Metal pattern motion ball-screw 213 is rotated from the state shown in Fig. 8 (b), and movable metal pattern 210 is near time lateral movement (Fig. 8 (c)).Then, the movable metal pattern 210 that has been moved to time side moves near center fixation plate 3 with opening and closing side movable platen 13, thereby is arranged to be in a mold cramping state.Detect this state in the mode identical by load current value with master.Afterwards, as shown in Fig. 8 (d), the resin of fusing is expelled to time side from inferior side injection unit 240 based on the motion of injection side movable platen 243.When with after the identical sensor of master detects injection and finishes, passed through after fixing retention time, injection side movable platen 234 and moveable die plate 13 move along the direction of opening, as shown in Fig. 8 (e).Then, can collect the product B of double color mold-making according to the operation of a cylinder (not shown).

In the present embodiment, the injection mechanism part 280 of electric motor driven injection molding machine 200 is configured to, all being made of the plunger-type mechanism of the electric motor driven injection molding machine 1 among Fig. 1 of two cover injecting unit, master and inferior sides.But this combination also can be arranged in following two combinations any one, promptly one is that plunger-type and another are combinations of the screw type of the built-in plunger in the electric motor driven injection molding machine 100 among Fig. 6, and the both is a combination of the screw type of built-in plunger.

Fig. 9 shows the plane of another different embodiment.Mould in electric motor driven injection molding machine 300 opens and closes mechanism 10 and constructs in the mode identical with electric motor driven injection molding machine shown in Figure 11, so that moveable die plate 13 realizes opening and closing motion with respect to the mould of center fixation plate 3 by the driving to the ball-screw 17 of cantilever position and 18,, an injection mechanism 290 opens and closes the amount L that a centerline offset one of mechanism 10 is fixed but being arranged to its injection head 82 relative moulds.This injection mechanism 290 is provided with one first injection side fixed head 81 and one second injection side fixed head 134, they are arranged to be fixed on each other with in the preset space length position spaced, and along the two tie-rod (not shown) that pass a pair of relative bight in the mode identical with the situation shown in Fig. 1 injection side movable platen 133 that leads, and this injection side movable platen 133 drives with two ball-screws 137 and 138 that are threaded relative bight by passing another between the two.

Ball-screw 137 and 138 and the both ends of tie-rod (not shown) all by the first and second injection side fixed heads 81 and 134 supportings, and be fixed on the injection side movable platen 133 the injection operation spare (extrudes part) such as plunger or like parts according to travelling forward of injection side movable platen 133 will fusing resin be injected into the die cavity that forms between fixed mould 11 and moveable die 12 by the mold cramping state through central side fixed head 3 from the leading edge of an injection head 82.

In fixed mould 11, be formed with one with the corresponding runner of a passage of resin of fusing, but in plane, form under the situation that is an elongated shape (the direction L in Fig. 9) at this die cavity, generally acknowledged such trend has been arranged, promptly since the resin of fusing become a mandarin along the longitudinal direction of die cavity from a side (is distolateral) and flow to an opposite side (another is distolateral), and die cavity finally is full of the resin of fusing, rather than from the resin of the central supply of die cavity fusing so that its a left side and right side to die cavity flow, so can obtain high-quality moulded resin products.

In this case, if injection head 82 is positioned at the center (center line of injection head 82 aligns with the center line that mould opens and closes mechanism 10) of die cavity, then formed runner elongated (it need extend to an end from the center of die cavity) in fixed mould 11 or like parts.Otherwise, if being arranged in advance near a distolateral place of elongated mold cavities that is in the mode of setovering, injection head 82 is provided with, just can shorten the formation distance of runner, and this metal pattern is easy to make, and can make the simple in structure of runner.

Figure 10 shows another different embodiment.In electric motor driven injection molding machine 350 according to present embodiment, one injection mechanism 330 adopts with mould and opens and closes the identical structure of mechanism 10, and promptly wherein the structure of moveable die plate 13 is supported and moved by two ball-

screws

17 and 18 that are in cantilever position (they extend through moveable die plate 13 relative to the bight) in the bottom of moveable die plate 13 with 16 by the track 15 of rail plate.In other words, an injection side movable platen 333 is arranged to, and a bearing element (Fig. 1 and 3) that is fixed in injection side movable platen 333 bottoms is toward or away from center fixation plate 3 by a rail plate that slides on the rectilinear orbit 315 and 316 that is formed on the framework.Tie-rod (the guide rod is not set) movable platen 333 that leads is not set.

In addition, two ball-screws 337 and 338 extend to injection mechanism 330 from center fixed head 3, and ball-screw 337 and 338 passes plate 333, are threaded with injection side movable platen 333 with two positions on relative bight.Each ball-screw 337 and 338 is configured to, and a cantilever position is arranged in each end, support without end plate, and belt pulley 355 and 355 is installed in the end of cantilever.One synchronous belt 356 is walked around in belt pulley 355 and 355, and is driven by the motor 352 of injection side.Therefore, ball-screw 337 rotates with identical speed in the same way with 338, and mobile injection side movable platen 333.Injection side movable platen 33 moves forward a plunger 342, with injecting resin.

As mentioned above, tie-rod and end plate have all been cancelled in mould opening and closing mechanism 10 and injection mechanism 330 sides, and the ball-screw that is in cantilever position by rotation comes mobile moveable die plate 13 and injection side movable platen 333, can reduce the quantity of part whereby, and the structure of equipment also becomes particularly simple.In addition, this equipment can be constructed simply, and simply form obtains bigger effect with compact size.

Claims

1. electric motor driven injection molding machine, it comprises:

One center fixation plate of one fixed mould of supporting metal pattern;

The one moveable die plate of one moveable die of supporting metal pattern, described moveable die plate movably be arranged to can near and leave described center fixation plate;

One rail plate, its admit moveable die plate a bottom and along described near and the direction the left described moveable die plate that leads slidably;

Be used to open and close the ball-screw of mould, described ball-screw extends to described moveable die plate from described center fixation plate with the state of cantilever;

Be used to open and close a motor of mould, described motor rotates the described ball-screw that is in cantilever position in the forward and backward directions, and makes the approaching described center fixation plate of described moveable die plate and make described moveable die plate leave described center fixation plate; And

One motor that is used to inject, described motor is arranged in the side relative with described moveable die plate of described relatively center fixation plate, and to open and close mechanism relative with the mould with said structure, described motor by described fixed mold plate and described moveable die plate near a mold cramping state of described fixed mould that forms and described moveable die in the resin driving of fusing is entered in the described metal pattern.

2. electric motor driven injection molding machine, it comprises:

One center fixation plate of one fixed mould of supporting metal pattern;

Be used to open and close two ball-screws of mould, described ball-screw extends to described moveable die plate from described center fixation plate with the state of cantilever, and two positions on the relative bight of moveable die plate engage with described moveable die plate;

3. electric motor driven injection molding machine as claimed in claim 1 or 2, it is characterized in that, the rotating drive power that described mould opens and closes motor is sent on the part that protrudes out laterally from described moveable die plate with cantilever position of described ball-screw, whereby, described ball-screw rotates with the state of cantilever.

4. electric motor driven injection molding machine as claimed in claim 1 or 2 is characterized in that, described injection mechanism comprises:

One injection side movable platen, described injection side movable platen are arranged to freely to be toward or away from described center fixation plate or another fixed head, and supporting enters the resin driving of fusing one plunger of described metal pattern;

Along described near and a guiding mechanism of departure direction guiding injection side movable platen;

One injection ball-screw, described injection side ball-screw extends to a side of described injection side movable platen and is threaded with this injection side movable platen from described center fixation plate or another fixed head; And

One injection motor, be used for rotating described ball-screw in the forward and backward directions so that described injection side movable platen near and leave described center fixation plate or another fixed head, enter described metal pattern thereby the resin of described fusing is driven by described plunger.

5. electric motor driven injection molding machine as claimed in claim 4, it is characterized in that, described injection ball-screw extends to a side of described injection side movable platen to be threaded with the injection side movable platen from described center fixation plate or another fixed head, the part that protrudes out from the injection side movable platen is by the supporting of injection side fixed head or be arranged to not have a cantilever position of injection side fixed head, and the rotating drive power of described injection side motor is sent to the described overhang of described ball-screw to rotate described ball-screw.

6. electric motor driven injection molding machine as claimed in claim 4, it is characterized in that, described injection side movable platen is configured to two described ball-screws and is threaded in a pair of relative bight, two guiding tie-rods pass relative bight at another, and the end of the end of two tie-rods and two described ball-screws is supported by the injection side fixed head.

7. electric motor driven injection molding machine as claimed in claim 4, it is characterized in that, described injection side movable platen is configured to two described ball-screws and is threaded in a pair of relative bight, be not provided as the tie-rod of the guiding mechanism of described injection side movable platen, be provided with the bottom of admitting described injection side movable platen and along described near and lead a slidably rail plate of described movable platen of departure direction be used as guiding mechanism, the part that protrudes out from described injection side movable platen of described ball-screw is arranged to a cantilever position, and the rotating drive power of described injection motor is sent to this part.