WO2022210789A1 - 射出装置 - Google Patents
射出装置 Download PDFInfo
- Publication number
- WO2022210789A1 WO2022210789A1 PCT/JP2022/015701 JP2022015701W WO2022210789A1 WO 2022210789 A1 WO2022210789 A1 WO 2022210789A1 JP 2022015701 W JP2022015701 W JP 2022015701W WO 2022210789 A1 WO2022210789 A1 WO 2022210789A1
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- WO
- WIPO (PCT)
- Prior art keywords
- screw
- axial force
- driving force
- injection device
- force sensor
- Prior art date
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- 238000002347 injection Methods 0.000 title claims abstract description 92
- 239000007924 injection Substances 0.000 title claims abstract description 92
- 230000005540 biological transmission Effects 0.000 claims abstract description 81
- 230000033001 locomotion Effects 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 239000012778 molding material Substances 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000005303 weighing Methods 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 21
- 230000000452 restraining effect Effects 0.000 claims description 17
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 238000001746 injection moulding Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
Definitions
- This invention relates to an injection device that injects a molding material using a screw, and in particular proposes a technique that contributes to improving the detection accuracy of the axial force acting on the screw.
- the injection device used in the injection molding machine mainly measures and injects molding materials such as resin materials using a screw that is rotated by a metering motor and driven forward and backward by an injection motor.
- a predetermined amount of molding material is melted and sent to the tip side of the cylinder by rotation of the screw by the metering motor.
- injection a predetermined amount of molding material fed to the tip side of the cylinder by metering is injected into the mold device by advancing the screw by the injection motor. After that, as pressure holding, the screw may be further advanced by the injection motor to apply the required pressure to the molding material in the mold device.
- the injection motor of the injection device outputs rotary motion as a rotary motor, and a motion conversion mechanism is used to convert this rotary motion into linear motion in the axial direction of the screw.
- a motion conversion mechanism an injection device that includes a screw shaft that rotates with the rotary motion of an injection motor and a nut inside which the screw shaft is arranged. Further, between the metering motor and the injection motor and the screw, driving force transmission is provided for transmitting the rotational driving force from the metering motor and the axial advance/retreat driving force transmitted from the injection motor through the motion conversion mechanism to the screw, respectively. A member is placed.
- the injection device is provided with an axial force sensor that detects an axial force acting on the screw in the axial direction, such as a reaction force that the screw receives from the molding material, for example, during the pressure holding described above.
- the axial force sensor does not rotate with the screw and that the closer the mounting position is to the screw, the higher the detection accuracy of the axial force.
- Patent Document 1 describes an injection apparatus having "a pressure detector arranged between the rotational movement shaft and the drive shaft,” in which "a rotation limiting mechanism for limiting the rotation of the pressure detector is provided. has been proposed.
- Patent Document 1 states that a “pressure detector” is “arranged between the rotational movement shaft and the drive shaft”. This "pressure detector” has room for improvement in terms of further improving the detection accuracy of the axial force.
- One injection device capable of solving the above problems injects a molding material, and includes a screw that is rotationally driven around a rotating shaft and axially driven forward and backward, and a forward and backward drive source for the screw.
- an injection motor a screw shaft that rotates with the rotary motion of the injection motor, and a nut inside which the screw shaft is arranged, the motion conversion mechanism converting the rotary motion of the injection motor into linear motion in the axial direction;
- a metering motor which is the rotational drive source of the screw, and a driving force transmission that is connected to the screw and transmits to the screw a rotational driving force based on the rotational motion of the metering motor and a forward/backward driving force based on the linear motion of the screw shaft of the motion conversion mechanism.
- the axial force detection section for detecting an axial force acting on the screw in the axial direction, the axial force detection section detecting the force between the screw and the driving force transmission member around the rotating shaft of the screw. It has an annular axial force sensor arranged to be relatively rotatable therebetween, and a rotation restraining member that restrains the rotation of the axial force sensor with respect to the rotation of the screw and the driving force transmission member.
- the axial force acting on the screw can be detected with relatively high accuracy.
- FIG. 1 is an axial cross-sectional view showing an injection device according to one embodiment of the present invention
- FIG. FIG. 2 is a cross-sectional view showing an enlarged main part of the injection device of FIG. 1
- FIG. 3 is a cross-sectional view showing a state in which a screw is advanced in the injection device of FIG. 2
- It is a sectional view showing the injection device of other embodiments.
- 2 is an enlarged cross-sectional view showing a connecting portion between a screw and a driving force transmission member of the injection device of FIG. 1;
- FIG. 10 is a cross-sectional view showing a connecting portion between a screw and a driving force transmission member in an injection device of still another embodiment
- 2 is a cross-sectional view showing a procedure for taking out an axial force detector in the injection device of FIG. 1
- FIG. FIG. 8 is a cross-sectional view showing a procedure following FIG. 7
- FIG. 9 is a cross-sectional view showing a procedure following FIG. 8
- FIG. 10 is a cross-sectional view showing the procedure following FIG. 9;
- the injection device 1 illustrated in FIG. 1 is an injection molding machine, which is arranged, for example, on a slide base 101 of a moving device for moving the injection device 1 forward and backward to inject a molding material into a mold device.
- the injection device 1 includes a screw 13 that is rotationally driven around a rotating shaft 12 inside a cylinder 11 and that is axially driven forward and backward (horizontal direction in FIG. 1); It has an injection motor 21 as a drive source and a metering motor 31 as a rotational drive source for the screw 13 .
- the rotational driving force from the metering motor 31 and the advancing/retreating driving force from the injection motor 21 are each transmitted to the screw 13 via the driving force transmission path.
- the screw 13 has a rotary shaft 12 extending from the inside of the metering motor 31 into the cylinder 11, and a helical flight is provided around the screw main body 13a mainly located in the cylinder 11. As shown in FIG. Further, the tip end portion 13b of the screw inside the cylinder 11 is tapered toward the front in the axial direction, and the base end portion 13c of the screw is located inside the metering motor 31 and connected to the driving force transmission path. ing.
- the direction along the rotating shaft 12 of the screw 13 is called the axial direction, and this axial direction corresponds to the left-right direction in FIG.
- the screw tip portion 13b side (the left side in FIG. 1) is the front side
- the screw base end portion 13c side (the right side in FIG. 1) is the rear side.
- injection motor and metering motor The injection motor 21 and the metering motor 31 can be arranged to be supported, for example, by the injection motor support member 22 and the metering motor support member 32, which are erected on the slide base 101, on the rear side in the axial direction of the screw 13. .
- the injection motor support member 22 and the weighing motor supporting member 32 are connected to each other by rods 24, 25 or the like at a plurality of locations around the weighing motor 31, for example.
- Both the injection motor 21 and the metering motor 31 are rotary motors that output rotational motion, and each includes rotors 21a and 31a as rotors and stators including coils arranged on the outer peripheral side of the rotors 21a and 31a. and a stator frame 21c, 31c having the stator 21b, 31b attached to its inner surface. Bearing portions 21d and 31d may be provided between the rotors 21a and 31a and the stator frames 21c and 31c.
- An encoder 25b is provided on the rear end surface of the stator frame 21c of the injection motor 21 and is connected to the rotor 21a by a shaft portion 25a to detect the rotation of the rotor 21a.
- the metering motor 31 is located on the front side of the injection motor 21 in the axial direction of the screw 13, and is provided so that the driving force transmission path passes through the inner side thereof.
- the driving force transmission path mainly includes a motion conversion mechanism 41 that converts the rotary motion of the injection motor 21 into axial linear motion of the screw 13, and the screw base end portion 13c of the screw 13. and a driving force transmission member 51 for transmitting to the screw 13 the rotational driving force based on the rotational motion of the metering motor 31 and the advancing/retreating driving force based on the linear motion converted by the motion conversion mechanism 41, respectively. It is configured.
- the motion conversion mechanism 41 includes a screw shaft 42 that rotates with the rotary motion of the injection motor 21, and a nut 43 inside which the screw shaft 42 is arranged.
- the nut 43 is fixedly attached to the cylindrical body 22a that connects the stator frame 21c of the injection motor 21 and the injection motor support member 22. As shown in FIG.
- the screw shaft 42 is spline-connected, for example, at the screw shaft base end 42 a to the inner peripheral surface of a cylindrical rotating member 23 provided on the inner peripheral side of the rotor 21 a of the injection motor 21 .
- the movement can rotate within the nut 43 to advance axially forward or retract axially.
- a key 42b is provided on the outer peripheral surface of the screw shaft base end portion 42a, and a corresponding key groove is provided on the inner peripheral surface of the cylindrical rotating member 23, respectively.
- the motion conversion mechanism includes a screw shaft and a nut, and can convert the rotary motion of the injection motor 21 into linear motion
- the screw shaft 42 is spline-connected to the cylindrical rotating member 23 on the injection motor 21 side. It is not limited to the illustrated one.
- the driving force transmission member 51 can have, for example, a structure as described below.
- the driving force transmission member 51 arranged inside the metering motor 31 is, as shown in FIG. 42c, and a front end wall 53 provided to cover the front opening of the tubular main body 52 in the axial direction.
- the tip portion 42c of the screw shaft can be connected to the rear side in the axial direction of the front end wall portion 53 of the driving force transmission member 51 via a bearing 54 such as a self-aligning thrust roller bearing or other thrust bearing.
- a bearing 54 such as a self-aligning thrust roller bearing or other thrust bearing.
- the inner ring of the bearing 54 is attached to the screw shaft tip portion 42 c and the outer ring of the bearing 54 is attached to the front end wall portion 53 .
- a key 52a is provided on the outer peripheral surface of the cylindrical body portion 52 of the driving force transmission member 51, and is fitted into a key groove on the inner peripheral surface of the rotor 31a of the weighing motor 31 to form a cylindrical shape.
- the body portion 52 and the rotor 31a are spline-connected.
- the screw base end portion 13c of the screw 13 is connected to the front side in the axial direction of the front end wall portion 53 of the driving force transmission member 51 .
- the driving force transmission member 51 rotates together with the rotary motion of the weighing motor 31, and the linear motion of the screw shaft 42 of the motion conversion mechanism 41 occurs independently of the rotation. Accordingly, the driving force transmission member 51 can move linearly. As a result, the screw 13 connected to the driving force transmission member 51 receives the rotational driving force based on the rotational motion of the metering motor 31 and the advancing/retreating driving force based on the linear motion of the screw shaft 42 of the motion conversion mechanism 41 respectively. transmitted.
- the screw 13 is rotated by the metering motor 31, and the molding material is melted and fed to the tip side of the cylinder 11 for metering. , the screw 13 is advanced to inject the molding material on the tip side of the cylinder 11 into the mold device. Thereafter, the screw 13 is further advanced by the injection motor 21, and holding pressure is performed to apply a predetermined pressure to the molding material in the mold device.
- the injection device 1 is provided with an axial force sensor.
- the axial force sensor can also be provided at a location on the rear side in the axial direction of the driving force transmission path described above, for example, at a location such as the cylindrical body 22 a between the injection motor 21 and the injection motor support member 22 .
- the axial force is transmitted from the screw 13 to the axial force sensor via the drive force transmission member 51 that can be spline-connected to the drive force transmission path, particularly the metering motor 31 side. Due to the influence of sliding resistance between the side and the driving force transmission member 51, the detection accuracy of the axial force is lowered.
- the force in the driving force transmission member 51 may be affected by the axial force detected by the axial force sensor. , there is a concern that it may not be possible to obtain detection results with as high accuracy as expected. Therefore, it is desirable to provide the axial force sensor at a position closer to the screw 13 .
- the axial force detection unit 61 that detects the axial force acting on the screw 13 in the axial direction transmits the driving force to the screw 13 around the rotating shaft 12 of the screw 13.
- An annular axial force sensor 62 such as a washer type load cell or the like arranged to be relatively rotatable with the member 51 , and a rotation of the axial force sensor 62 with respect to the rotation of the screw 13 and the driving force transmission member 51 . It is assumed that there is a rotation restraining member 63 for restraining.
- the axial force sensor 62 is located between the screw 13 and the driving force transmission member 51 on the front side in the axial direction and is close to the screw 13 , so that the axial force from the screw 13 can be detected. In the detection, there is almost no influence of the sliding resistance of the driving force transmission member 51 in the driving force transmission path. Further, the axial force sensor 62 is prevented from rotating with respect to the rotation of the screw 13 and the driving force transmission member 51 by the rotation suppressing member 63 . As a result, the axial force sensor 62 can detect the axial force with high accuracy.
- the rotation restraining member 63 can restrain the rotation of the axial force sensor 62 by connecting the axial force sensor 62 to a member that does not rotate together with the screw 13 and the driving force transmission member 51, for example. can do.
- a rotation restraining member 63 illustrated in FIGS. 2 and 3 connects the axial force sensor 62 to the metering motor support member 32, thereby preventing the axial force sensor from being induced by the rotation of the screw 13 and the driving force transmission member 51. 62 rotation is suppressed.
- the weighing motor support member 32 is provided with a slide hole 33 into which the rotation restraining member 63 is inserted.
- the shape of the slide hole 33 for the rotation restraint member 63 is appropriately determined corresponding to the shape of the rotation restraint member 63 so that the rotation restraint member 63 inserted therein can slide in the axial direction.
- the rotation restraint member 63 can be, for example, a tubular shape such as a cylinder that surrounds the rotating shaft 12 of the screw 13 as shown in the drawing.
- the rotation restraint member 63 may be one or more axially extending on the outer peripheral side of the rotating shaft 12 of the screw 13, or may be a plurality of bar-shaped or plate-shaped members spaced apart from each other in the circumferential direction. good.
- the rotation restraint member 63 is preferably slidable in the axial direction within the slide hole 33 of the weighing motor support member 32 regardless of the shape described above. As a result, for example, when an advance/retreat driving force is transmitted from the injection motor 21 to the screw 13 via the driving force transmission member 51, the rotation restraint member 63 moves inside the slide hole 33 as shown in FIG. It can slide and move forward together with the axial force sensor 62 between the driving force transmission member 51 and the screw 13 . When the driving force for retracting the screw 13 is transmitted, the rotation suppressing member 63 and the axial force sensor 62 retract together with the driving force transmitting member 51 and the screw 13, as shown in FIG.
- the slide hole 33 restricts the displacement of the rotation restraining member 63 inserted therein in the circumferential direction of the rotating shaft 12, thereby restraining the rotation of the rotation restraining member 63 and the axial force sensor. be done.
- the axially forward portion of the rotation restraint member 63 penetrates the weighing motor support member 32 and protrudes further forward in the axial direction than the weighing motor support member 32.
- the illustrated slide hole 33 axially penetrates the weighing motor support member 32, a slide hole that does not axially penetrate the weighing motor support member is also possible.
- the rotation restraining member is not limited to connecting the axial force sensor 62 to the weighing motor support member 32 as described above.
- stator frame 31c includes, for example, a tubular portion 163a extending axially from the axial force sensor 162, and an axial front end portion of the tubular portion 163a extending outward to the stator frame 31c. It has a shape that includes a flange-like portion 163b leading to it.
- the stator frame 31c is fixedly attached to the rear side of the weighing motor support member 32 in the axial direction. 62 may function to dampen the rotation.
- the axial force sensor 162 can detect the driving force transmitting member when the driving force is transmitted. It can move forward or backward with 51 and screw 13 .
- the embodiment of FIG. 4 can be substantially the same as those shown in FIGS.
- a rod-shaped or plate-shaped rotation restraint member that is provided at one or more locations in the circumferential direction of the rotating shaft 12 and that bends midway in the axial direction may be used. .
- the wiring 64 of the axial force sensor 62 included in the axial force detection unit 61 is, as shown by broken lines in FIGS. It can extend from the axial force sensor 62 along the rotation restraining member 63 , such as inside the rotation restraining member 63 , so as to pass through the slide hole 33 . As a result, it is possible to suppress the disconnection or damage of the wiring 64 due to the rotation or forward/backward displacement of the surrounding driving force transmission member 51 or the screw 13 .
- Such wiring may be omitted in an axial force sensor for wireless communication and contactless power supply.
- a bearing 55 is interposed between the front end wall portion 53 and the axial force sensor 62, as shown in the enlarged view of FIG. can be connected to the axial force sensor 62. Since the bearing 55 effectively supports the axial force sensor 62 to which the axial force is transmitted from the screw 13 in the axial direction from behind, the thrust bearing, above all, has alignment properties and is not affected by mounting errors and the like. A self-aligning thrust roller bearing is preferred.
- the illustrated axial force sensor 62 is provided with an outer annular portion 62a protruding rearward on the outer peripheral edge of the surface on the rearward side in the axial direction. Further, the front end wall portion 53 of the driving force transmission member 51 is provided with a central raised portion 53a that rises forward in the axial direction.
- the bearing 55 has an inner ring mounted between the front surface of the front end wall portion 53 of the driving force transmission member 51 and the central raised portion 53a, and an outer ring mounted between the rear surface of the axial force sensor 62 and the outer side. It is attached between the annular portion 62a.
- the axial force sensor 62 arranged as illustrated The axial force sensor 62 can further increase the detection accuracy in the axial direction.
- a connecting cylinder portion 53b extending in the axial direction is provided on the central raised portion 53a of the front end wall portion 53 of the driving force transmission member 51.
- the rotating shaft 12 of the screw 13 has the shaft end portion 12a of the screw base end portion 13c inserted into the connecting cylinder portion 53b.
- the connecting tube portion 53 b and the shaft end portion 12 a constitute a coupling portion for transmitting the rotational driving force from the driving force transmitting member 51 to the screw 13 as a connecting portion between the screw 13 and the driving force transmitting member 51 .
- the screw 13 is fixed to the rotary shaft 12 at the screw base end portion 13c, as shown in FIG.
- a retaining joint flange 14 is provided.
- the joint flange 14 is designed so that the screw 13 does not largely separate from the driving force transmission member 51 even when the screw 13 is retracted (so-called suckback) after pressure holding or metering. It functions to reliably connect the screw 13 and the driving force transmission member 51 in the axial direction.
- the joint flange 14 is, for example, biting into and connected to the rotating shaft 12, and is fitted to the flange portion 15 extending in an annular shape such as an annular ring on the outer peripheral side, and is fitted to the rear side of the flange portion 15 in the axial direction to form the outer periphery of the connecting cylinder portion 53b. and a ring portion 16 surrounding the sides.
- the flange portion 15 has an outer fitting portion 15a that extends axially rearward from the outer peripheral edge and is bent inwardly. It has a bent inner fitting portion 16a, and the flange portion 15 and the ring portion 16 are fitted at the outer fitting portion 15a and the inner fitting portion 16a.
- the joint flange 14 is configured by composing the flange portion 15 from a plurality of disassembleable parts, such as two pieces. It is preferably attached detachably to 12 .
- the axial force sensor 62 is positioned between the joint flange 14 of the screw 13 and the front end wall portion 53 of the driving force transmission member 51 around the shaft end portion 12a and the connecting cylinder portion 53b. can be positioned between
- the screw 13 can be relatively rotatably connected to the axial force sensor 62 by the joint flange 14. can.
- This bearing 17 between the joint flange 14 and the axial force sensor 62 is a thrust sensor for the same reason as the bearing 55 between the driving force transmission member 51 and the axial force sensor 62 as described above. It is preferred that the bearing be a self-aligning thrust roller bearing.
- the inner ring of the bearing 17 between the joint flange 14 and the axial force sensor 62 is attached to the axial force sensor 62 and the bearing 17 is preferably attached to the ring portion 16 of the joint flange 14 .
- the inner ring of the bearing 17 is attached between the axial front side surface of the axial force sensor 62 and the inner annular portion 62b provided on the inner peripheral edge of the front side surface and protruding forward.
- a cylindrical projecting portion 16b projecting rearward in the axial direction is formed on the outer edge of the ring portion 16 of the joint flange 14, and the outer ring of the bearing 17 is supported by the cylindrical projecting portion 16b.
- the axial force sensor 62 supports the bearing 17 between the joint flange 14 and the inner annular portion 62b, and supports the bearing 55 between the front end wall portion 53 of the driving force transmission member 51 and the outer annular portion. It is supported by the portion 62a.
- the connecting portion between the screw 13 and the joint flange 14 via the bearing 17 is located on the inner peripheral side of the connecting portion between the driving force transmission member 51 and the front end wall portion 53 via the bearing 55 .
- the screw 13 is arranged so that the axial force transmitted from the screw 13 to the joint flange 14 via the rotating shaft 12 is reliably transmitted by the axial force sensor 62 between the joint flange 14 and the front end wall portion 53 . It is preferable that the axial end portion 12a and the joint flange 14 of the joint member 53b and the connecting tubular portion 53b are relatively displaceable in the axial direction.
- a key and a key groove are provided on the outer peripheral surface of the shaft end portion 12a and the inner peripheral surface of the connecting tubular portion 53b, respectively, and the outer peripheral surface of the connecting tubular portion 53b and the inner peripheral surface of the ring portion 16 of the joint flange 14 are provided.
- a key and a keyway can be provided on the peripheral surfaces, respectively, and splined together.
- C2 is provided respectively.
- the screw 13 can be slightly displaced in the axial direction relative to the driving force transmission member 51 , and the axial force acting on the screw 13 is the axial force between the joint flange 14 and the driving force transmission member 51 . Since it is effectively transmitted to the sensor 62, the axial force sensor 62 can detect the axial force with higher accuracy.
- an axial force transmission flange 214 is fixed to the screw base end portion 13c of the rotating shaft 12 of the screw 13 as in the embodiment shown in FIG. can be provided.
- the axial force transmission flange 214 is relatively rotatably connected to the axial force sensor 62 via the bearing 17 .
- the shaft end portion 12a and the connecting tube portion 53b are spline-connected, and clearances are provided between the shaft end portion 12a and the connecting tube portion 53b and between the axial force transmission flange 214 and the connecting tube portion 53b.
- the axial force from the screw 13 is effectively transmitted to the axial force sensor 62 via the axial force transmission flange 214 .
- the embodiment of FIG. 6 has substantially the same configuration as described above, except that joint flange 14 is replaced with axial force transmission flange 214 . It is preferable that the axial force transmission flange 214 is detachably attached to the rotating shaft 12 by, for example, forming the axial force transmission flange 214 with a plurality of disassembleable parts such as two pieces.
- the sensor connection portion of the support member 32 to which the axial force sensor 62 is connected by the rotation restraint member 63 can be formed integrally with the motor support portion that supports the weighing motor 31 .
- the sensor connection portion 32b of the weighing motor support member 32 is replaced with a frame-shaped motor support portion as in the illustrated embodiment. 32a, and preferably detachable from the motor support portion 32a.
- the sensor connecting portion 32b in which the slide hole 33 can be provided can be formed in a cylindrical shape, etc., taking into consideration the shape of the rotation restraint member 63, such as a bar shape, a plate shape, or a cylindrical shape. can.
- the weighing motor support member 32 has a frame-like motor support portion 32a and a cylinder support portion 32c provided with a hole 32d through which the screw 13 passes. installed as possible.
- the cylinder support portion 32c can be provided with a cooler by water cooling or the like, although not shown, in the vicinity of the supply port of the molding material into the cylinder 11. As shown in FIG.
- the injection device 1 described above can be disassembled as described below.
- the cylinder support portion 32c is removed together with the cylinder 11 from the motor support portion 32a of the metering motor support member 32, thereby exposing the screw 13 as shown in FIG.
- the sensor connection portion 32b is removed from the motor support portion 32a of the weighing motor support member 32, as shown in FIG.
- the connection is released, and the shaft end portion 12a of the rotary shaft 12 of the screw 13 is pulled out from the connecting cylinder portion 53b of the driving force transmission member 51, resulting in the state shown in FIG.
- the axial force detector 61 can be taken out without disassembling the weighing motor 31, the driving force transmission member 51, and the portion on the injection motor 21 side. Therefore, according to this embodiment, as described above, by arranging the axial force detection unit 61 in the vicinity of the screw 13 inside the injection device 1, the detection accuracy of the axial force can be improved while the axial force can be detected. Maintenance of the portion 61 can be performed relatively quickly and easily. After dismantling the injection device 1 in this way, it can be assembled by performing the above steps in reverse.
- the cylinder 11 has a screw 13 disposed therein, and melts a molding material supplied therein from a supply port (not shown) by heating and rotation of the screw 13 .
- a heater 18 is arranged around the cylinder 11 to heat the molding material inside.
- the cylinder 67 has a nozzle 19 with a small inner and outer diameter on the front side in the axial direction, and the heater 18 is also arranged around the nozzle 19 .
- the injection apparatus 1 as described above is mounted on an injection molding machine, and upon injection molding, each step can be performed by operating as described below.
- a mold device (not shown) is closed to perform a mold clamping process in a state in which a predetermined amount of molding material has already been weighed and placed inside the cylinder 11 in the weighing process of the previous injection molding.
- the screw 13 is advanced to inject the molding material into the mold device to fill the cavity in the mold device with the molding material. and a holding pressure step for holding the molding material at a predetermined pressure.
- a cooling process is performed in which the molding material filled in the mold device is cooled and hardened to obtain a molded product.
- the molding material separately supplied into the cylinder 11 is melted while being fed toward the nozzle 19 of the cylinder 11 by the rotation of the screw 13 under heating by the heater 18, and a predetermined amount of the molding material is supplied to the nozzle 19.
- a weighing step is performed to place the
- the mold device is opened and the mold is opened, and the ejector device is used to take out the molded product from the mold device.
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- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
図1に例示する射出装置1は、射出成形機で、たとえば射出装置1を前進・後退させる移動装置のスライドベース101上に配置されて、金型装置への成形材料の射出を行うものである。この実施形態では、射出装置1は、シリンダ11の内部で、回転軸12の周りに回転駆動されるとともに、軸方向(図1では左右方向)に進退駆動されるスクリュ13と、スクリュ13の進退駆動源の射出モータ21と、スクリュ13の回転駆動源の計量モータ31とを備える。計量モータ31からの回転駆動力及び、射出モータ21からの進退駆動力はそれぞれ、駆動力伝達経路を介してスクリュ13に伝達される。
スクリュ13は、計量モータ31の内側からシリンダ11内に延びる回転軸12を有し、その主としてシリンダ11内に位置するスクリュ本体部13aの周囲に、螺旋状のフライトが設けられている。また、シリンダ11内のスクリュ先端部13bは、軸方向の前方側に向かうに従い先細りに形成されるとともに、スクリュ基端部13cは、計量モータ31の内側に位置して駆動力伝達経路に接続されている。
射出モータ21及び計量モータ31はそれぞれ、たとえば、スライドベース101上に立てて設けられた射出モータ支持部材22及び計量モータ支持部材32に、スクリュ13の軸方向の後方側で支持されて配置され得る。射出モータ支持部材22及び計量モータ支持部材32の相互は、たとえば、計量モータ31の周囲の複数箇所にてロッド24、25等で互いに連結される。
この実施形態の射出装置1では、駆動力伝達経路は、主に、射出モータ21の回転運動をスクリュ13の軸方向の直線運動に変換する運動変換機構41と、スクリュ13のスクリュ基端部13cに接続され、計量モータ31の回転運動に基づく回転駆動力及び、運動変換機構41で変換される上記の直線運動に基づく進退駆動力をそれぞれスクリュ13に伝達する駆動力伝達部材51とを含んで構成されている。
ところで、射出成形機で射出成形を行うに際し、射出装置1では、計量モータ31でスクリュ13を回転させ、成形材料を溶融させながらシリンダ11の先端側に送って計量を行い、次いで、射出モータ21でスクリュ13を前進させ、シリンダ11の先端側の成形材料を金型装置内に射出する。その後、射出モータ21でスクリュ13を更に前進させ、金型装置内の成形材料に所定の圧力を作用させる保圧が行われる。
そうすると、スクリュ基端部13cにアクセスすることが可能になるので、スクリュ基端部13cにおけるジョイントフランジ14のフランジ部15を分解してスクリュ13から取り外すとともに、スクリュ13と駆動力伝達部材51との接続を解除し、スクリュ13の回転軸12の軸端部12aを駆動力伝達部材51の連結筒部53bから引き抜き、図9に示す状態とする。
シリンダ11は、その内部にスクリュ13が配置され、図示しない供給口から当該内部に供給される成形材料を、加熱及びスクリュ13の回転により溶融させるものである。シリンダ11の周囲には、内部の成形材料を加熱する加熱器18が配置されている。
以上に述べたような射出装置1は射出成形機に搭載されて、射出成形に際し、次に述べるように動作して各工程が行われ得る。
11 シリンダ
12 回転軸
12a 軸端部
13 スクリュ
13a スクリュ本体部
13b スクリュ先端部
13c スクリュ基端部
14 ジョイントフランジ
214 軸力伝達フランジ
15 フランジ部
15a 外側嵌合部
16 リング部
16a 内側嵌合部
16b 筒状突出部分
17 ベアリング
18 加熱器
19 ノズル
21 射出モータ
31 計量モータ
21a、31a ロータ
21b、31b ステータ
21c、31c ステータフレーム
21d、31d 軸受部
22 射出モータ支持部材
22a 筒体
23 筒状回転部材
24、25 ロッド
25a 軸部
25b エンコーダ
32 計量モータ支持部材
32a モータ支持部
32b センサ連結部
32c シリンダ支持部
32d 穴部
33 スライド穴
41 運動変換機構
42 ねじ軸
42a ねじ軸基端部
42b キー
42c ねじ軸先端部
43 ナット
51 駆動力伝達部材
52 筒状本体部
52a キー
53 前端壁部
53a 中央***部
53b 連結筒部
54、55 ベアリング
61、161 軸力検出部
62、162 軸力センサ
62a 外側環状部
62b 内側環状部
63、163 回転抑止部材
163a 筒状部分
163b フランジ状部分
64 配線
67 シリンダ
101 スライドベース
C1、C2 クリアランス
Claims (16)
- 成形材料を射出する射出装置であって、
回転軸周りに回転駆動されるとともに、軸方向に進退駆動されるスクリュと、
スクリュの進退駆動源の射出モータと、
射出モータの回転運動とともに回転するねじ軸及び、前記ねじ軸が内側に配置されたナットを含み、射出モータの回転運動を前記軸方向の直線運動に変換する運動変換機構と、
スクリュの回転駆動源の計量モータと、
スクリュに接続され、計量モータの回転運動に基づく回転駆動力及び、運動変換機構のねじ軸の直線運動に基づく進退駆動力をそれぞれスクリュに伝達する駆動力伝達部材と、
スクリュに対して前記軸方向に作用する軸方向力を検出する軸力検出部と
を備え、
前記軸力検出部が、スクリュの回転軸の周囲にてスクリュと駆動力伝達部材との間で相対的に回転可能に配置された環状の軸力センサ、並びに、スクリュ及び駆動力伝達部材の回転に対して軸力センサの回転を抑止する回転抑止部材を有する射出装置。 - 当該射出装置が、計量モータを支持する計量モータ支持部材を備え、
前記回転抑止部材により、該計量モータ支持部材に軸力センサが回転を抑止されつつ前記軸方向に変位可能に連結されてなる請求項1に記載の射出装置。 - 前記計量モータ支持部材が、前記回転抑止部材用のスライド穴を有し、
前記スライド穴に、前記回転抑止部材が前記軸方向にスライド可能に挿入されて配置されてなる請求項2に記載の射出装置。 - 前記回転抑止部材が、スクリュの回転軸の外周側で前記軸方向に延びる一個以上の棒状もしくは板状、又は、スクリュの回転軸の周囲を取り囲む筒状を有する請求項3に記載の射出装置。
- 前記軸力検出部が、軸力センサから回転抑止部材に沿って前記スライド穴を通って延びる配線を有する請求項3又は4に記載の射出装置。
- 前記計量モータ支持部材が、
計量モータを支持するモータ支持部と、
回転抑止部材により軸力センサが連結され、モータ支持部に対して着脱可能なセンサ連結部と
を有する請求項2~5のいずれか一項に記載の射出装置。 - 前記駆動力伝達部材が、
ねじ軸先端部の周囲を取り囲む筒状本体部と、
筒状本体部の前記軸方向の前方側の開口部に設けられた前端壁部と
を有する請求項1~6のいずれか一項に記載の射出装置。 - 駆動力伝達部材が前端壁部で、軸力センサと、ベアリングを介して相対的に回転可能に連結されてなる請求項7に記載の射出装置。
- 駆動力伝達部材の前端壁部と軸力センサとの間のベアリングが、スラスト軸受である請求項8に記載の射出装置。
- 駆動力伝達部材の前端壁部と軸力センサとの間のベアリングの内輪が、駆動力伝達部材の前端壁部に取り付けられるとともに、当該ベアリングの外輪が、軸力センサに取り付けられてなる請求項8又は9に記載の射出装置。
- スクリュと駆動力伝達部材との接続箇所のカップリング部が、駆動力伝達部材の前端壁部から前記軸方向に延びる連結筒部、及び、回転軸のスクリュ基端部に設けられて連結筒部に挿入された軸端部を含み、
スクリュがスクリュ基端部に、回転軸に着脱可能に取り付けられて前記連結筒部を内側に保持するジョイントフランジを有し、
前記軸力センサが、前記軸端部及び前記連結筒部の周囲で、スクリュの前記ジョイントフランジと前記駆動力伝達部材の前端壁部との間に位置する請求項8~10のいずれか一項に記載の射出装置。 - 前記軸端部及びジョイントフランジと前記連結筒部とが前記軸方向に相対変位可能であり、スクリュに作用する軸方向力が、スクリュの前記ジョイントフランジと前記駆動力伝達部材の前端壁部との間の軸力センサに伝達される請求項11に記載の射出装置。
- スクリュが前記ジョイントフランジで、軸力センサと、ベアリングを介して相対的に回転可能に連結されてなる請求項11又は12に記載の射出装置。
- スクリュの前記ジョイントフランジと軸力センサとの間のベアリングが、スラスト軸受である請求項13に記載の射出装置。
- 環状の前記軸力センサの、スクリュの前記ジョイントフランジとのベアリングを介する連結箇所が、駆動力伝達部材の前端壁部とのベアリングを介する連結箇所よりも内周側に位置する請求項13又は14に記載の射出装置。
- スクリュの前記ジョイントフランジと軸力センサとの間のベアリングの内輪が、軸力センサに取り付けられるとともに、当該ベアリングの外輪が、ジョイントフランジに取り付けられてなる請求項13~15のいずれか一項に記載の射出装置。
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01249419A (ja) * | 1988-03-31 | 1989-10-04 | Nissei Plastics Ind Co | 射出成形機の射出装置 |
WO2005002829A2 (de) * | 2003-07-03 | 2005-01-13 | Krauss-Maffei Kunststofftechnik Gmbh | Maschine, insbesondere spritzgiessmaschine, mit einem kraftsensor |
JP2010513069A (ja) * | 2006-12-20 | 2010-04-30 | キストラー ホールディング アクチエンゲゼルシャフト | プラスチック射出成形機械用のカップリング |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01249419A (ja) * | 1988-03-31 | 1989-10-04 | Nissei Plastics Ind Co | 射出成形機の射出装置 |
WO2005002829A2 (de) * | 2003-07-03 | 2005-01-13 | Krauss-Maffei Kunststofftechnik Gmbh | Maschine, insbesondere spritzgiessmaschine, mit einem kraftsensor |
JP2010513069A (ja) * | 2006-12-20 | 2010-04-30 | キストラー ホールディング アクチエンゲゼルシャフト | プラスチック射出成形機械用のカップリング |
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