JP2002028949A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine for family molding enabling two-stage injection by one plasticizing device even if a molding resin is a wearable resin and dispensing with a valve gate. SOLUTION: In the injection molding machine constituted so as to inject and charge a resin in a plurality of the cavities formed to a mold 1 through the moving nozzle device N provided between a plasticizing injection device 9 and the mold 1, the mold 1 is equipped with a plurality of sprue bushes 2a, 2b respectively communicating with the cavities and the moving nozzle device N is equipped with the tip nozzles 15 coming into contact with the sprue bushes 2a, 2b under pressure in an aligned state, a drive device for moving the tip nozzles 15 so as to be able to align them with the sprue bushes, the slide base 14 for sliding the tip nozzles between the plasticizing injection device 9 and the mold 1 so as to enable them to advance and retreat and a coil spring 12 energized so as to allow the tip nozzles 15 to retreat from the bushes 2a, 2b. The plasticizing injection device 9 is equipped with the injection device nozzle 8 brought into contact with the inlet of the resin passage 6a, which is formed to the nozzle main body 16 of the moving nozzle device N communicating with the tip nozzles 15, under pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine for family molding.

[0002]

2. Description of the Related Art In a conventional injection molding machine, when the molding resin is a wearable resin, the valve gate is damaged even if the resin flow path is switched by switching the valve gate in the family mold. Was not effective because it was early. This is because abrasion resin causes the valve gate system to last less than one month due to abrasion, thereby increasing costs. In such a case, a valve gate is not used, and a plurality of plasticizers, for example, two plasticizers are mounted on an injection molding machine, and each cavity is filled by injection from the plasticizers. is there.

[0003]

However, in the conventional injection molding machine, since two plasticizers are mounted, the cost of the machine is increased, and the installation area of the machine is increased. There was a problem that the layout was restricted.

[0004] In view of the above-mentioned problems of the prior art, the present invention makes it possible to inject a resin into a plurality of cavities with a single plasticizing device even if the molding resin is a wearable resin. Another object of the present invention is to provide an injection molding machine for family picking and molding that does not require a valve gate.

[0005]

For this purpose, in an injection molding machine according to the present invention, a plurality of molds formed on a mold are provided via a moving nozzle device provided between a plasticizing injection device and the mold. An injection molding machine configured to inject and fill a resin into the cavity, wherein the mold includes a plurality of spool bushes each communicating with the cavity, and the moving nozzle device is capable of being positioned with respect to the spool bush. A tip nozzle to be pressed against, a driving device to move the tip nozzle so that it can be positioned; a slide base to slide the tip nozzle forward and backward between the plasticizing injection device side and the mold side; A retracting unit urged to retract the nozzle from the spool bush, wherein the plasticizing injection device includes a nozzle of the moving nozzle device communicating with the tip nozzle. Characterized by comprising an injection device nozzle pressed against the inlet of the resin passage formed in the body.

In another injection molding machine of the present invention, the driving device of the moving nozzle device is further provided with a telescopic means fixed to the slide base, and connected to the telescopic means and fixed to the slide base. The rack comprises a rack reciprocally mounted along a guide rail, and an annular pinion that meshes with the rack and rotates. The nozzle body of the moving nozzle device has the annular pinion fixed thereto and fixed to the slide base. A rotary nozzle rotatably supported by a bearing provided, and wherein the resin passage is bored eccentrically with respect to the rotation axis from the plasticizing injection device side toward the mold side.

In still another injection molding machine of the present invention, the driving device for the moving nozzle device further includes a motor fixed to the slide base, a first gear connected to an output shaft of the motor, A second gear meshing with the first gear; the nozzle body of the moving nozzle device is rotatably supported by a bearing to which the second gear is fixed and fixed to the slide base; The resin nozzle is a rotary nozzle which is eccentrically formed with respect to the rotation axis from the plasticizing injection device side toward the mold side.

[0008] In still another injection molding machine of the present invention, the driving device for the moving nozzle device further includes an expansion and contraction means rotatably supported by a frame fixed to the slide base; The moving nozzle device includes a guide rail that slidably guides the nozzle body of the moving nozzle device, and the nozzle body of the moving nozzle device is a rotary nozzle rotatably supported by the frame.

In the above-mentioned injection molding machine, it is preferable that the retracting means is a coil spring or a cylinder fixed to the slide base and in contact with a fixed platen.

In the above injection molding machine, it is preferable that the expansion / contraction means is a cylinder.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a main part of an injection molding machine according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of an operation of a rotary nozzle of the injection molding machine of FIG. 1, and FIG. FIG. 3B is a plan view of the nozzle device, FIG. 3B is a front view thereof, FIG. 4 is a plan view of a moving nozzle device of an injection molding machine according to another embodiment of the present invention, FIG. 5 is a front view of FIG. 7 is a cross-sectional view taken along the arrow A in FIG. 4, FIG. 7 is a plan view of a moving nozzle device of an injection molding machine according to still another embodiment of the present invention, FIG. 8 is a front view of FIG. 7, and FIG. It is arrow sectional drawing.

In FIG. 1, reference numeral 1 denotes a mold, and a moving nozzle device N is provided between the mold 1 and a plasticizing injection device 9 on a main body frame of the injection molding machine.

In the mold 1, cavities 1a and 1b are formed on the non-operation side and the operation side, respectively.
The molten resin injected from the injection device nozzle 8 of the plasticizing injection device 9 is injected and filled into a and 1b via the moving nozzle device N.

The mold 1 has mold spool bushes 2a and 2b communicating with the cavities 1a and 1b, respectively, on the surface of the movable injection nozzle device side. The spool bush 2a, 2b
Since the tip nozzle 15 of the movable injection nozzle device N is a portion where the tip nozzle 15 is pressed, the pressed portion is desirably formed in a concave shape so that the tip nozzle 15 can be easily pressed.

The moving nozzle device N is a rotary nozzle in the embodiment of FIG.
a nozzle body 6 having a tip nozzle 15 that is in pressure contact with the nozzles a and 2b, and a driving device that enables the tip nozzle 15 to be aligned.
5 is provided with a slide base 14 that slides forward and backward between the plasticizing injection device 9 side and the mold 1 side.

As shown in FIG. 3, the driving device includes a hydraulic cylinder 13 fixed to a slide base 14 by a fixing bracket 13a, and a piston 13 of the hydraulic cylinder 13.
b, and a rack 11 attached reciprocally along a guide rail 16 fixed to a slide base 14, and an annular pinion that rotates while meshing with the rack 11 and attached to the nozzle body 6. 5

As shown in FIG. 3B, the slide base 14 slides forward and backward along a guide bar 10 provided along the direction of advance and retreat of the plasticizing injection device 9. The guide bar 10 is fixed to a mounting table 18 provided between the plasticizing injection device 9 and the mold 1 and fixed to a main body frame of the injection molding machine.

The nozzle body 6 which is a moving nozzle device N
An annular pinion 5 is fixed to a peripheral surface, is supported by a bearing 4 fixed to the slide base 14, and a resin passage 6 a leading to the tip nozzle 15 is provided in a mold from the plasticizing injection device 9 side. It is formed so as to be eccentric to the rotation axis 6b of the nozzle body 6 toward one side. In addition,
As shown in FIG. 1, a temperature control device 7 is built in the nozzle body 6. As the temperature control device 7, for example, a device in which a plurality of rod-shaped cartridge heaters are radially arranged and built in is desirable.

The tip nozzle 15 of the rotary nozzle is detachable from the nozzle body 6 and is replaceable. By installing a shut-off nozzle, drooling can be prevented.

A coil spring 12 as a retracting means is fixed to the slide base 14 on the fixed platen side, and one end of the coil spring 12 is in contact with the fixed platen 3 and a tip nozzle 15 is plasticized and injected from the spool bush 2a, 2b. It is urged to retreat to the device side.

Since the rotary nozzle type injection device has the above configuration, the rack 11 connected to the hydraulic cylinder 13 moves along the guide rail 16 by driving the hydraulic cylinder 13, and the rack 11 is connected to the rack 11. The meshed pinion 5 rotates, and the nozzle body 6 rotates.

After the tip nozzle 15 of the nozzle body 6 is rotated to the spool bush 2a on the non-operation side and the injection device nozzle 8 of the plasticizing injection device 9 is advanced to the mold side, the nozzle body 6 and the slide base are moved. 14 moves to the mold side while being guided by the guide bar 10, and the spool bush 2a on the non-operation side and the tip nozzle 15 are pressed against each other. After the two are pressed, the molten resin is injected and filled from the plasticizing and injection device 9, and the cavity 1a on the non-operation side is filled with the resin (see FIG. 2).

When the injection device nozzle 8 of the plasticizing injection device 9 is retracted, the slide base 14 is retracted by the coil spring 12 so that the nozzle body 6 is retracted from the mold side. By projecting the piston rod 13b of the cylinder 13, the nozzle body 6 is inverted via the annular pinion 5 and stopped at the position of the spool bush 2b on the operation side.

Thereafter, when the injection device nozzle 8 of the plasticizing injection device 9 is advanced to the mold side, the nozzle body 6 and the slide base 14 are moved to the mold side while being guided by the guide bar 10, and are moved to the operation side. And the tip nozzle 15 is pressed against the spool bush 2b. After both are pressed, the molten resin is injected and filled from the plasticizing injection device 9, and the resin is filled in the cavity 1b on the operation side. Here, the resin necessary for filling the resin on the operation side and the resin on the non-operation side is performed by one measuring operation, and is injected and divided in two times.

Next, an injection molding machine according to another embodiment of the present invention will be described. In FIG. 4, reference numeral 41 denotes a mold, and a moving nozzle device N is provided on the main body frame of the injection molding machine between the mold 41 and the plasticizing injection device 49.

The mold 41 has a counter-operation side and an operation side, respectively.
The cavities 41a and 41b are formed, and the molten resin injected from the injection device nozzle 48 of the plasticizing injection device 49 is injected and filled into the cavities 41a and 41b via the moving nozzle device N.

The mold 41 is provided with the cavities 41a, 41
The spool bushings 42a and 42b communicating with the movable injection nozzle device are provided on the surface on the side of the movable injection nozzle device. Spool bush 42a,
Reference numeral 42b denotes a portion where the tip nozzle 55 of the movable injection nozzle device N is pressed, so that the pressed portion is desirably formed in a concave shape so that the tip nozzle 55 can be easily pressed.

The moving nozzle device N is a rotary nozzle in the embodiment of FIG. 4, similarly to the embodiment of FIG. 1, and has a tip nozzle 55 which is in pressure contact with the spool bushings 42a and 42b so as to be aligned. Nozzle body 46
And a drive device that enables the tip nozzle 55 to be aligned, and a slide base 54 that allows the tip nozzle 55 to slide forward and backward between the plasticizing / injection device 49 side and the mold 41 side. .

As shown in FIG. 4, the driving device comprises: a servo motor 53 fixed to the slide base 54;
The first motor connected to the output shaft 53a of the servomotor 53
It comprises a gear 51 and a second gear 45 meshed with the first gear 51 and attached to the nozzle body 46.

As shown in FIG. 5, the slide base 54 slides forward and backward along a guide bar 50 provided along the advance and retreat direction of the plasticizing injection device 49. The guide bar 50 is fixed to a mounting table 58 provided between the plasticizing injection device 49 and the mold 41 and fixed to a main body frame of the injection molding machine.

The nozzle body 4 which is a moving nozzle device N
6 is a resin passage 46a which is fixed to the peripheral surface of the second gear 45 and is axially supported by a bearing 56 fixed to the slide base 54, and communicates with the tip nozzle 55.
Are formed eccentrically with respect to the rotation axis 46b of the nozzle body 46 from the plasticizing injection device 49 side toward the mold 41 side. In addition, as shown in FIG. 6, a temperature controller 47 is built in the nozzle body 46. As the temperature control device 47, for example, a device in which a plurality of rod-shaped cartridge heaters are radially arranged and incorporated is desirable.

A coil spring 52, which is a retracting means, is fixed to the slide base 54 on the fixed platen side. It is urged to retreat to the device side.

Since the rotary nozzle type injection device has the above-described configuration, the first gear 51 connected to the output shaft 53a of the servomotor 53 engages with the first gear 51 by driving the servomotor 53. Second gear 4
5 rotates, and the nozzle body 46 rotates.

After the tip nozzle 55 of the nozzle body 46 is rotated to the spool bush 42a on the non-operation side, and the injection device nozzle 48 of the plasticizing injection device 49 is advanced to the mold side, the nozzle body 46 and the slide base are moved. While the guide 54 is being guided by the guide bar 50, it moves to the mold side, and the spool bush 42a on the non-operation side and the tip nozzle 55 are pressed against each other. After they are pressed together, the plasticizing injection device 49
Is injected and filled with a molten resin from the cavity 41 on the non-operation side.
a is filled with a resin.

The resin filling into the operation side cavity 41b is as follows.
When the injection device nozzle 48 of the plasticizing injection device 49 is retracted, the slide base 54 is retracted by the coil spring 52, the nozzle body 46 is retracted from the mold side, and the servo motor 5
3, the nozzle body 46 is rotated via the second gear 45, and the spool bush 42 on the operation side is rotated.
Stop at position b.

Thereafter, when the injection device nozzle 48 of the plasticizing injection device 49 is advanced to the mold side, the nozzle body 46 and the slide base 54 move to the mold side while being guided by the guide bar 50, and move to the operation side. Spool bush 4
2b is pressed against the tip nozzle 55. After both are pressed, the molten plastic is injected and filled from the plasticizing injection device 49,
The resin is filled in the cavity 41b on the operation side.

Next, an injection molding machine according to still another embodiment of the present invention will be described. In FIG. 7, 71
Is a mold, and a moving nozzle device N is provided between the mold 71 and the plasticizing injection device 79 on a main body frame of the injection molding machine.

[0038] The mold 71 has an opposite operation side and an operation side, respectively.
The cavities 71a and 71b are formed, and the molten resin injected from the injection device nozzle 78 of the plasticizing injection device 79 is injected and filled into the cavities 71a and 71b via the moving nozzle device N.

The mold 71 is provided with the cavities 71a, 71
The spool bushings 72a and 72b respectively communicating with b are provided on the surface on the side of the movable injection nozzle device. Spool bush 72a,
Reference numeral 72b denotes a portion where the tip nozzle 85 of the movable injection nozzle device N is pressed, so that the pressed portion is desirably formed in a concave shape so that the tip nozzle 85 is easily pressed.

The moving nozzle device N is a rotating nozzle in the embodiment of FIG. 7, and has a spool bush 72a,
A nozzle body 76 having a tip nozzle 85 that is press-contacted with the tip nozzle 72b so as to be aligned with the tip nozzle 8;
5 is provided with a slide base 84 that slides forward and backward between the plasticizing injection device 79 side and the mold 71 side.

As shown in FIG. 7, the driving device comprises a hydraulic cylinder 83 which is a telescopic means rotatably supported by a frame 81 fixed to the slide base 84, and a piston rod 73a of the hydraulic cylinder 83. And a guide rail 86 that slidably guides the nozzle body 76 rotatably connected to the nozzle body 76.

As shown in FIG. 8, the slide base 84 slides forward and backward along a guide bar 80 provided along the direction of movement of the plasticizing injection device 79. It is fixed to a mounting table 88 provided between the injection device 79 and the mold 71 and fixed to the main body frame of the injection molding machine. A guide rail 86 is provided on an upper portion 84c of the slide base 84.

The nozzle body 7 as the moving nozzle device N
6 is rotatably supported by the frame 81 and connected to a piston rod 73a of a hydraulic cylinder 83. Two stoppers 84 provided on an upper portion 84c of the slide base 84 are provided at a lower portion of the nozzle body 76.
a, and a projection 76c abutting on 84b. Further, a resin passage 76 a communicating with the tip nozzle 85 is formed in the nozzle body 76 along an axis 76 b of the nozzle body 76. The nozzle body 46 has a built-in temperature controller 47 as in the example shown in FIG. Temperature controller 47
For example, it is desirable that a plurality of rod-shaped cartridge heaters are radially arranged and incorporated.

An air cylinder 82 as a retracting means is fixed to the slide base 84 on the fixed platen side. The air cylinder 82 has one end in contact with the fixed platen 73 and the tip nozzle 85 is plasticized from the spool bushings 72a and 72b. Urged to retract toward the chemical injection device.

Since the rotary nozzle type injection device has the above configuration, the nozzle body 76 connected to the hydraulic cylinder 83 causes the piston rod 73a of the hydraulic cylinder 83 to protrude, thereby forming an arc-shaped guide rail 86. While rotating along the fulcrum 81a of the frame 81.

After the protrusion 76c of the nozzle body 76 comes into contact with the stopper 84a and the tip nozzle 85 pivotally moves to the spool bush 72a on the non-operation side, the plasticizing injection device 7
9 is advanced to the mold side, the nozzle body 76 and the slide base 84 are moved to the mold side while being guided by the guide bar 80, and the spool bush 72a on the non-operation side and the tip nozzle 85 are moved. Is pressed.
After the two are pressed, the molten resin is injected and filled from the plasticizing injection device 79, and the resin is filled in the cavity 71a on the non-operation side.

The resin filling into the operation side cavity 71b is as follows.
When the injection device nozzle 78 of the plasticizing injection device 79 is retracted, the slide base 84 is retracted by the air cylinder 82, the nozzle body 76 is retracted from the mold side, and the piston rod 73a of the hydraulic cylinder 83 is retracted.
The nozzle body 76 rotates to the operation side along the guide rail 86, and the projection 76c contacts the stopper 84b and stops at the position of the spool bush 72b on the operation side.

Thereafter, when the injection device nozzle 78 of the plasticizing injection device 79 is advanced to the mold side, the nozzle body 76 and the slide base 84 move to the mold side while being guided by the guide bar 80, and move to the operation side. Spool bush 7
2b is pressed against the tip nozzle 85. After both are pressed, the molten resin is injected and filled from the plasticizing injection device 79,
The resin is filled in the cavity 71b on the operation side.

[0049]

As described above in detail, according to the present invention, a plurality of cavities formed in the mold via a moving nozzle device provided between the plasticizing injection device and the mold. An injection molding machine for injecting and filling a resin into the mold, wherein the mold includes a plurality of spool bushes each communicating with the cavity, and the moving nozzle device is press-contacted with the spool bush so as to be aligned. A tip nozzle, a driving device that moves the tip nozzle so that the nozzle can be positioned, a slide base that allows the tip nozzle to slide forward and backward between the plasticizing injection device side and the mold side, and the tip nozzle. A retracting unit urged to retract from the spool bush, wherein the plasticizing injection device is formed on a nozzle body of the moving nozzle device communicating with the tip nozzle. Since with an injection device nozzle pressed against the inlet of the resin passage, the one plasticizing injection apparatus performs resin required resin filled with a single weighing operation,
For example, family injection molding can be performed by performing injection filling twice.

Further, in the present invention, since the moving nozzle device is provided instead of the valve gate, even if the molding resin is a wearable resin, it is possible to perform the family molding. Furthermore, since one plasticizing injection device performs the injection for two times, for example, by performing two injections, the number of injection plasticizing devices is reduced by half as a whole injection molding machine. As a result, the manufacturing cost can be significantly reduced, the installation area of the machine can be reduced, and installation in a factory becomes easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an injection molding machine according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view of a rotary nozzle of the injection molding machine of FIG.

3A is a plan view of a moving nozzle device of the injection molding machine of FIG. 1, and FIG. 3B is a front view of the same.

FIG. 4 is a plan view of a moving nozzle device of an injection molding machine according to another embodiment of the present invention.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a sectional view taken along the arrow A in FIG. 4;

FIG. 7 is a plan view of a moving nozzle device of an injection molding machine according to still another embodiment of the present invention.

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a cross-sectional view taken along the arrow B in FIG. 7;

[Explanation of symbols]

1,41 Mold 1a, 1b Cavity 2a, 2b Spool bush 3 Fixed platen 4,56 Bearing 5 Annular pinion 6,46,76 Nozzle body (of rotary nozzle) 6a, 46a Resin passage 6b, 46b Rotating shaft 7,47 Cartridge heater 8 Injection device nozzle 9,49,79 Plasticization injection device 10 Guide bar 11 Rack 12 Coil spring 13 Hydraulic cylinder 14,54,84 Slide base 15 Tip nozzle 45 Second gear 51 First gear 53 Servo motor 53a Output shaft 73 Fixed platen 81 Frame 83 Hydraulic cylinder 86 Guide rail N, N ', N''Moving nozzle device

Claims (7)

[Claims] An injection molding machine configured to inject and fill a resin into a plurality of cavities formed in a mold via a moving nozzle device provided between the plasticizing injection device and the mold. The mold includes a plurality of spool bushes each communicating with the cavity, and the moving nozzle device moves the tip nozzle so as to be able to align with the tip nozzle that is in pressure contact with the spool bush so that the tip nozzle can be aligned. A driving device, a slide base for sliding the tip nozzle between the plasticizing injection device side and the mold side so as to be able to move forward and backward, and a retracting means biased to retract the tip nozzle from the spool bush. The plasticizing injection device includes an injection device nozzle that is in pressure contact with an inlet of a resin passage formed in a nozzle body of the moving nozzle device that communicates with the tip nozzle. An injection molding machine comprising: 2. A driving device of the moving nozzle device, wherein the driving device is attached to the expansion and contraction means fixed to the slide base and reciprocally movable along a guide rail connected to the expansion and contraction means and fixed to the slide base. A nozzle body of the moving nozzle device, the annular pinion is fixed, and the nozzle body is rotatably supported by a bearing fixed to the slide base. 2. The injection molding machine according to claim 1, wherein said resin passage is a rotary nozzle which is bored eccentrically with respect to a rotation axis from a plasticizing injection device side toward a mold side. 3. A driving device for the moving nozzle device, comprising: a motor fixed to the slide base; a first gear connected to an output shaft of the motor; and a second gear meshing with the first gear.
A nozzle body of the moving nozzle device, the second gear is fixed to the nozzle body, and the nozzle body is rotatably supported by a bearing fixed to the slide base. 2. The injection molding machine according to claim 1, wherein the injection molding machine is a rotary nozzle which is formed so as to be eccentric with respect to the rotation axis from the center toward the mold side. 4. A driving device for the moving nozzle device, comprising: a telescopic unit rotatably supported by a frame fixed to the slide base; and a nozzle body of the moving nozzle device connected to the telescopic unit. The injection molding machine according to claim 1, comprising a guide rail that guides in a slidable manner, and wherein the nozzle body is a rotary nozzle rotatably supported by the frame. 5. The injection molding apparatus according to claim 1, wherein said retracting means is a coil spring fixed to said slide base and in contact with a fixed platen. 6. The injection molding apparatus according to claim 1, wherein said retracting means is a cylinder fixed to said slide base and in contact with a fixed platen. 7. The injection molding machine according to claim 2, wherein the expansion and contraction means is a cylinder.