WO2022163486A1 - 射出装置および制御方法 - Google Patents
射出装置および制御方法 Download PDFInfo
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- WO2022163486A1 WO2022163486A1 PCT/JP2022/001946 JP2022001946W WO2022163486A1 WO 2022163486 A1 WO2022163486 A1 WO 2022163486A1 JP 2022001946 W JP2022001946 W JP 2022001946W WO 2022163486 A1 WO2022163486 A1 WO 2022163486A1
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- Prior art keywords
- screw
- bush
- inner peripheral
- outer peripheral
- linear
- Prior art date
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- 238000002347 injection Methods 0.000 title claims abstract description 35
- 239000007924 injection Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 46
- 230000002093 peripheral effect Effects 0.000 claims abstract description 220
- 238000001514 detection method Methods 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 description 33
- 230000004048 modification Effects 0.000 description 33
- 238000010586 diagram Methods 0.000 description 12
- 238000000465 moulding Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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Classifications
-
- 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
-
- 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
- the present invention relates to an injection device and a control method.
- Japanese Patent Application Laid-Open No. 2019-055488 discloses a motor control unit that controls a linear motion motor and a rotary motion motor.
- the linear motion motor is a motor that moves the bush in the axial direction of the screw.
- the rotational motion motor is a motor that rotates the bush around the axis of the screw.
- the motor control unit controls the linear motion motor to advance the bushing in the direction of approaching the screw from the state separated from the screw.
- the motor control section controls the motor for rotary motion to rotate the bush.
- JP-A-2019-055488 assumes that the spline shaft and the spline hole do not fit together and the bush contacts the screw. Therefore, in JP-A-2019-055488, when the bush fitted to the spline shaft continues to move forward and the spline shaft comes into contact with the bottom surface of the spline hole, the work of rotating the bush is wasted.
- the present invention provides an injection device and a control method that can improve the working efficiency of spline fitting.
- a first aspect of the present invention is a screw disposed along a front-rear direction for injecting an injection resin and a rearward direction opposite to the forward direction; and a bush formed so as to be spline-fitted with the screw,
- An injection device for spline-fitting a screw and the bush a linear motion motor for moving the bush forward and backward in the longitudinal direction with respect to the screw; a rotary motor that rotates the bushing with respect to the screw; a first detection unit that detects a linear motion torque of the linear motion motor; a second detection unit that detects the rotational torque of the rotary motor; a motor control unit that executes control processing for controlling the linear motion motor and the rotary motor while monitoring the linear motion torque and the rotational torque so that the bush is spline-fitted to the screw; with
- the screw has a plurality of outer peripheral protrusions formed on the outer peripheral surface of the rear end side of the screw and extending along the front-rear direction at intervals in the peripheral direction of the screw
- Each of the plurality of inner peripheral protrusions is formed with an inner peripheral protrusion slope that slopes so that the width of the inner peripheral protrusion along the circumferential direction of the through hole becomes smaller toward the front end,
- the motor control unit advances the bushing until the linear torque exceeds the linear torque threshold, and when the rotational torque exceeds the rotational torque threshold before the linear torque exceeds the linear torque threshold, terminates the control process when the direct torque exceeds the direct torque threshold.
- a second aspect of the present invention is a screw arranged along the front-rear direction of injecting the resin for injection and the rearward direction opposite to the forward direction; a bush formed so as to be spline-fittable with the screw; a linear motion motor for moving the bush forward and backward in the longitudinal direction with respect to the screw; a rotary motor that rotates the bushing with respect to the screw; a first detection unit that detects a linear motion torque of the linear motion motor; a second detection unit that detects the rotational torque of the rotary motor;
- a control method for controlling the linear motion motor and the rotary motor while monitoring the linear motion torque and the rotary torque so that the screw and the bush are spline-fitted in an injection device comprising: an advancing step of advancing the bushing until the linear torque exceeds a linear torque threshold; If the rotational torque exceeds the rotational torque threshold before the linear torque exceeds the linear torque threshold, advance of the bush is stopped when the linear torque exceeds the linear torque threshold.
- the screw has a plurality of outer peripheral protrusions formed on the outer peripheral surface of the rear end side of the screw and extending along the front-rear direction at intervals in the peripheral direction of the screw, Each of the plurality of outer peripheral protrusions is formed with an outer peripheral protrusion slope inclined so that the outer peripheral protrusion width along the circumferential direction of the screw becomes smaller toward the rear end,
- the bushing has a through hole and a plurality of inner peripheral protrusions formed on the inner peripheral surface of the through hole and extending in the front-rear direction at intervals in the peripheral direction of the through hole, Each of the plurality of inner peripheral protrusions is formed with an inner peripheral protrusion slope that slopes so that the width of the inner peripheral protrusion along the circumferential direction of the through hole becomes smaller toward the front end.
- At least one of the bush and the screw can be rotated by the outer peripheral protrusion slope or the inner peripheral protrusion slope to guide the spline engagement. Also, the state in which the spline fitting is guided can be grasped from the rotational torque. Therefore, spline fitting can be performed without uselessly rotating the bush, and as a result, work efficiency of spline fitting can be improved.
- FIG. 1 is a schematic diagram showing an injection device according to one embodiment.
- FIG. 2 shows a screw and bushing.
- FIG. 3 is a flow chart showing a procedure of control processing executed by the motor control section to spline-fit the screw and the bush.
- FIG. 4 is a diagram showing how the rear end of the outer peripheral projection of the screw and the front end of the inner peripheral projection of the bush are in contact with each other.
- 5 is an enlarged view of the contact portion between the rear end of the outer peripheral protrusion and the front end of the inner peripheral protrusion in FIG. 4.
- FIG. FIG. 6 is a diagram showing the screw and bush of Modification 1.
- FIG. 7 is a diagram showing a screw and bush of Modification 2.
- FIG. 8 is a diagram showing a screw and bush of Modification 3.
- FIG. 9A is a cross-sectional view of the screw of FIG. 8, and
- FIG. 9B is a cross-sectional view of the bushing of FIG.
- FIG. 10 is a diagram showing a screw and bush of Modification 4.
- FIG. 1 is a schematic diagram illustrating an injection device 10 according to one embodiment.
- the injection device 10 injects molding resin into a mold.
- the injection direction for injecting the molding resin is the forward direction
- the direction opposite to the injection direction is the rearward direction.
- the injection device 10 is provided with a screw 12 , a bush 14 , a bush fastening portion 16 and a drive mechanism 18 .
- the screw 12 is accommodated in the through hole 20H of the cylinder 20.
- the screw 12 rotates to forward the molding resin introduced into the through-hole 20H.
- a nozzle 22 is provided at the front end of the cylinder 20 , and the molding resin fed by the screw 12 is injected from the nozzle 22 .
- the screw 12 has a screw portion 12A and a spline portion 12B.
- the screw part 12A is the front part of the screw 12.
- a spiral protrusion 12P is formed on the outer peripheral surface of the screw portion 12A.
- the spline portion 12B is the rear portion of the screw 12 and is connected to the rear end of the screw portion 12A.
- An outer peripheral surface of the spline portion 12B is formed with protrusions and recesses that can be spline-fitted with the bush 14 .
- the bushing 14 is spline-fitted with the screw 12 .
- the bushing 14 has a through hole 14H penetrating in the front-rear direction.
- the inner peripheral surface of the through-hole 14H is formed with irregularities that can be spline-fitted with the spline portion 12B.
- the bush 14 is provided with an annular projection 14A projecting rearward from the rear end surface of the bush 14 .
- the bush fastening portion 16 fixes the bush 14 behind the bush 14 .
- the bush fastening portion 16 has a concave portion 16A in which the convex portion 14A of the bush 14 is accommodated.
- the bushing 14, in which the convex portion 14A is accommodated in the concave portion 16A, is fixed to the bush fastening portion 16 with a bolt.
- the drive mechanism 18 is a mechanism that drives at least one of the screw 12 and the bush 14 so as to move the bush 14 relative to the screw 12 .
- the drive mechanism 18 that drives the bush 14 is used.
- the drive mechanism 18 includes a linear motor 24 , a rotary motor 26 and a motor control section 28 .
- the direct-acting motor 24 is a motor that advances and retracts the bush 14 in the front-rear direction.
- a motor shaft of the direct-acting motor 24 is connected to a ball screw 30 that rotates together with the motor shaft.
- a sliding portion 32 is attached to the ball screw 30 so as to move the ball screw 30 back and forth in accordance with the rotation of the direct-acting motor 24 .
- a linear motion gear 34 is rotatably attached to the sliding portion 32 .
- the linear motion gear 34 is fixed to the rear end of the bush fastening portion 16 .
- the linear motor 24 is provided with an encoder 36 that detects the rotation angle of the linear motor 24 and a first detector 38 that detects the linear torque of the linear motor 24 .
- the rotary motor 26 is a motor that rotates the bush 14 .
- a rotation gear 40 that meshes with the linear motion gear 34 is connected to the motor shaft of the rotation motor 26 .
- the rotary motor 26 is provided with an encoder 42 that detects the rotation angle of the rotary motor 26 and a second detector 44 that detects the rotational torque of the rotary motor 26 .
- the direct-acting gear 34 moves back and forth via the ball screw 30 and the sliding portion 32 in accordance with the rotation of the direct-acting motor 24 .
- the rotation gear 40 and the rotary motor 26 meshing with the linear motion gear 34 move in the longitudinal direction, and the bush 14 moves in the longitudinal direction via the bush fastening portion 16 to which the linear motion gear 34 is fixed.
- the rotation gear 40 rotates according to the rotation of the rotary motor 26 .
- the linear motion gear 34 meshing with the rotation gear 40 rotates, and the bush 14 rotates via the bush fastening portion 16 to which the linear motion gear 34 is fixed.
- the motor control unit 28 advances and retreats the bush 14 by controlling the direct-acting motor 24 so that the rotation angle detected by the encoder 36 becomes a target value. Further, the motor control unit 28 rotates the bush 14 by controlling the rotary motor 26 so that the rotation angle detected by the encoder 42 becomes a target value.
- the motor control unit 28 executes control processing for controlling the linear motion motor 24 and the rotary motor 26 so that the bush 14 is spline-fitted to the screw 12 .
- the motor control unit 28 controls the linear motor 24 and the rotary motor 26 while monitoring the linear torque detected by the first detector 38 and the rotational torque detected by the second detector 44. .
- FIG. 2 is a diagram showing the screw 12 and the bush 14.
- FIG. 1 is a diagram showing the screw 12 and the bush 14.
- FIG. 1 A plurality of outer peripheral protrusions 50 are formed on the outer peripheral surface of the spline portion 12B and extend in the front-rear direction at intervals in the peripheral direction of the spline portion 12B.
- Each of the plurality of outer peripheral protrusions 50 is divided by a fitting groove 52 that makes a round along the circumferential direction of the spline portion 12B.
- An annular retainer 46 ( FIG. 1 ) is fitted in the fitting groove 52 .
- each of the plurality of outer peripheral projections 50 is the same. Only one of the plurality of outer peripheral protrusions 50 will be described below regarding the shape of the outer peripheral protrusion 50 .
- An outer peripheral protrusion slope 50S is formed at one rear end portion of both side surfaces 50F1 and 50F2 of the outer peripheral protrusion 50 in the circumferential direction of the screw 12 .
- the outer peripheral protrusion slope 50S is inclined so that the outer peripheral protrusion width 50W along the circumferential direction of the screw 12 becomes smaller toward the rear end.
- a plurality of inner peripheral protrusions 60 are formed on the inner peripheral surface of the through hole 14H of the bush 14 and extend in the front-rear direction at intervals in the peripheral direction of the through hole 14H.
- Each of the plurality of inner peripheral projections 60 has the same shape. Only one of the plurality of inner peripheral protrusions 60 will be described below regarding the shape of the inner peripheral protrusion 60 .
- An inner peripheral protrusion inclined surface 60S is formed at one front end portion of both side surfaces 60F1 and 60F2 of the inner peripheral protrusion 60 in the circumferential direction of the through hole 14H.
- the inner peripheral protrusion slope 60S is inclined so that the inner peripheral protrusion width 60W along the circumferential direction of the through hole 14H becomes smaller toward the front end.
- FIG. 3 is a flowchart showing the procedure of control processing executed by the motor control unit 28 to spline-fit the screw 12 and the bush 14 together.
- This control process is started after the bush 14 is moved to a predetermined fitting start position spaced rearward from the rear end surface of the screw 12 .
- the rotation center line LN1 (FIG. 2) of the screw 12 and the center line LN2 (FIG. 2) of the through hole 14H of the bush 14 are preferably aligned, but the rotation center line LN1 and the center line LN2 may be slightly deviated.
- step S ⁇ b>1 the motor control unit 28 advances the bushing 14 toward the screw 12 .
- the control process shifts from step S1 to step S2.
- step S2 the motor control unit 28 compares the linear motion torque detected by the first detection unit 38 while the bush 14 is advancing with a predetermined linear motion torque threshold. Here, if the direct torque does not exceed the direct torque threshold, the control process proceeds to step S3.
- step S3 the motor control unit 28 compares the rotational torque detected by the second detection unit 44 while the bush 14 is moving forward with a predetermined rotational torque threshold.
- the control process returns to step S2.
- the control process proceeds to step S4.
- the phenomenon in which the rotational torque exceeds the rotational torque threshold in step S3 occurs in the following state. That is, the front end of the inner peripheral protrusion 60 of the bush 14 is in contact with the outer peripheral protrusion slope 50S of the screw 12 . Alternatively, the rear end of the outer peripheral protrusion 50 of the screw 12 is in contact with the inner peripheral protrusion slope 60S of the bush 14 . Alternatively, the inner peripheral protrusion slope 60S of the bush 14 is in contact with the outer peripheral protrusion slope 50S of the screw 12 .
- step S4 the motor control unit 28 compares the linear motion torque detected by the first detection unit 38 while the bush 14 is moving forward with the linear motion torque threshold.
- the control process remains at step S4.
- the control process proceeds to step S5.
- the phenomenon in which the direct torque exceeds the direct torque threshold in step S4 occurs in the following state. In other words, the rear end surface of the screw 12 spline-fitted with the bush 14 while being guided by the outer peripheral protrusion slope 50S or the inner peripheral protrusion slope 60S is in contact with the bottom surface of the recess 16A of the bush fastening portion 16.
- step S5 the motor control unit 28 stops advancing the bush 14 when the direct torque exceeds the direct torque threshold.
- the control process ends.
- the motor control unit 28 advances the bushing 14 until the direct torque exceeds the direct torque threshold. If the rotational torque exceeds the rotational torque threshold before exceeding the direct torque threshold, the motor control unit 28 terminates the control process when the direct torque exceeds the direct torque threshold.
- the bush 14 can be rotated by the outer peripheral protrusion slope 50S or the inner peripheral protrusion slope 60S to guide spline engagement. Also, the state in which the spline fitting is guided can be grasped from the rotational torque. Therefore, the spline fitting can be performed without rotating the bush 14 uselessly, and as a result, the working efficiency of the spline fitting can be improved.
- step S6 if the linear torque exceeds the linear torque threshold in step S2 before the rotational torque exceeds the rotational torque threshold, the control process proceeds to step S6.
- the phenomenon in which the direct torque exceeds the direct torque threshold in step S2 occurs in the following state. That is, the rear end of the outer peripheral projection 50 and the front end of the inner peripheral projection 60 are in contact with each other, or the rear end of the spline-fitted screw 12 is in contact with the bottom surface of the recess 16A of the bush fastening portion 16 .
- step S6 the motor control unit 28 stops advancing the bush 14.
- step S7 the control process proceeds to step S7.
- step S7 the motor control unit 28 retreats the bush 14 by a specified distance from the position where the bush 14 was stopped in step S6.
- the control process proceeds to step S8.
- step S8 the motor control unit 28 rotates the bush 14 by a specified angle at the position where it was retracted by the specified distance in step S7.
- the control process proceeds to step S9.
- This prescribed distance is a distance that prevents the spline engagement from coming off when the screw 12 and the bush 14 are spline-fitted.
- step S9 the motor control section 28 compares the rotational torque detected by the second detection section 44 with the rotational torque threshold.
- the rotational torque detected by the second detector 44 is rotational torque when the bush 14 is rotating while the advance of the bush 14 is stopped.
- step S9 If the rotational torque does not exceed the rotational torque threshold in step S9, the control process returns to step S1. Note that the fact that the rotational torque does not exceed the rotational torque threshold in step S9 means that the rear end face of the outer peripheral projection 50 and the front end face of the inner peripheral projection 60 are in contact with each other. Therefore, in step S2, it is determined that the direct torque exceeds the direct torque threshold. That is, the screw 12 and the bush 14 are not yet spline-fitted.
- step S9 if the rotational torque exceeds the rotational torque threshold in step S9, the control process proceeds to step S10.
- the fact that the rotational torque exceeds the rotational torque threshold in step S9 means that the rear end surface of the screw 12 spline-fitted with the bush 14 is in contact with the bottom surface of the recess 16A of the bush fastening portion 16. Therefore, in step S2, it is determined that the direct torque exceeds the direct torque threshold. That is, the screw 12 and the bush 14 are already spline-fitted.
- step S10 the motor control unit 28 terminates the control process by stopping the rotation of the bush 14 even if the rotation of the bush 14 has not reached the specified angle.
- the motor control unit 28 may end the control process after moving forward by the prescribed distance that was reversed in step S7.
- the motor control unit 28 causes the bush 14 to retreat by a prescribed distance and then rotate by a prescribed angle. In this case, when the rotational torque exceeds the rotational torque threshold, the motor control section 28 terminates the control process. As a result, the spline-fitted state can be correctly captured, and the control process can be terminated.
- the motor control unit 28 may rotate the bushing 14 by the specified angle while retracting the bushing 14 by the specified distance.
- steps S7 and S8 are integrated into one step.
- the motor control unit 28 advances the bush 14 until the direct torque exceeds the direct torque threshold. As a result, it is possible to correctly detect that the spline has not yet been fitted, and continue the control process.
- a specified angle for rotating the bush 14 is determined in step S8 so that the screw 12 and the bush 14 are spline-fitted in one rotation of the bush 14 .
- FIG. 4 shows how the rear end of the outer peripheral protrusion 50 of the screw 12 and the front end of the inner peripheral protrusion 60 of the bush 14 are in contact with each other.
- FIG. 5 is an enlarged view of the contact portion between the rear end of the outer peripheral protrusion 50 and the front end of the inner peripheral protrusion 60 in FIG.
- Expression a1 is the distance of the outer peripheral protrusion inclined surface 50S along the circumferential direction of the screw 12 .
- ( 1 ) b1 is the distance of the rear end surface of the outer peripheral protrusion 50 along the circumferential direction of the screw 12 .
- ( 1 ) b2 is the distance of the front end surface of the inner peripheral projection 60 along the peripheral direction of the through hole 14H.
- (1) c 1 is the interval between the outer peripheral projections 50 along the circumferential direction of the screw 12 .
- ( 1 ) c2 is the interval between the inner peripheral protrusions 60 along the peripheral direction of the through hole 14H.
- X in the formula (1) is a value obtained by multiplying the diameter (radius) r (FIG. 2) from the center line LN2 (FIG. 2) of the through hole 14H to the front end of the inner peripheral projection 60 by a specified angle.
- a2 is the distance of the inner circumferential projection slope 60S along the circumferential direction of the through hole 14H.
- the screw 12 and the bush 14 can be spline-fitted by one rotation of the bush 14 with respect to the screw 12 .
- FIG. 6 is a diagram showing the screw 12 and bushing 14 of Modification 1. As shown in FIG. In FIG. 6, the same reference numerals are assigned to the same configurations as those described in the embodiment. In addition, in this modification, the description which overlaps with embodiment is omitted.
- the rear end of the outer peripheral protrusion 50 of the screw 12 is formed in a sharp or rounded shape. That is, the rear end of the outer peripheral projection 50 of the screw 12 does not have a flat surface.
- the front end of the inner peripheral protrusion 60 of the bush 14 is formed in a sharp or rounded shape. That is, the front end of the inner peripheral projection 60 of the bushing 14 does not have a flat surface.
- b1 and b2 in the above equation ( 1 ) are zero.
- FIG. 7 is a diagram showing the screw 12 and bushing 14 of Modification 2. As shown in FIG. In FIG. 7, the same reference numerals are assigned to the same configurations as those described in the embodiment. In addition, in this modification, the description which overlaps with embodiment is omitted.
- the outer peripheral protrusion slope 50S of the outer peripheral protrusion 50 is formed on each of the two side surfaces 50F1 and 50F2 of the screw 12 in the circumferential direction.
- the inner peripheral protrusion slope 60S of the inner peripheral protrusion 60 is formed on each of the circumferential direction side surfaces 60F1 and 60F2 of the through hole 14H.
- a1 in the above formula ( 1 ) is the distance along the circumferential direction of the screw 12 of the outer peripheral protrusion slope 50S formed on each of the side surfaces 50F1 and 50F2 of the outer peripheral protrusion 50. It is harmony.
- the screw 12 and the bush 14 can be spline-fitted by rotating the bush 14 with respect to the screw 12 once, as in the embodiment.
- FIG. 8 is a diagram showing the screw 12 and bushing 14 of Modification 3.
- FIG. 9A is a view showing a cross section of the screw 12 of FIG. 8.
- FIG. 9B is a view showing a cross section of bushing 14 of FIG.
- the same reference numerals are assigned to the same configurations as those described in the embodiment.
- the description which overlaps with embodiment is omitted.
- a second outer peripheral protrusion slope 50SS is formed on the outer peripheral protrusion 50 of this modified example.
- the second outer peripheral protrusion slope 50SS is inclined so that the outer diameter of the screw 12 decreases toward the rear end of the outer peripheral protrusion 50 . That is, the second outer peripheral protrusion slope 50SS is inclined so that the radius R1 (FIG. 9A) of the screw 12 from the rotation center line LN1 of the screw 12 becomes smaller toward the rear end of the outer peripheral protrusion 50.
- a second inner peripheral protrusion slope 60SS is formed on the inner peripheral protrusion 60 of this modification.
- the second inner peripheral protrusion slope 60SS is inclined so that the inner diameter of the bush 14 increases toward the front end of the inner peripheral protrusion 60 . That is, the second inner peripheral projection slope 60SS is inclined such that the radius R2 (FIG. 9B) of the through hole 14H from the center line LN2 of the through hole 14H increases toward the front end of the inner peripheral projection 60.
- FIG. 10 is a diagram showing the screw 12 and bushing 14 of Modification 4. As shown in FIG. In FIG. 10, the same reference numerals are assigned to the same configurations as those described in the embodiment. In addition, in this modification, the description which overlaps with embodiment is omitted.
- the second outer peripheral protrusion slope 50SS is formed between the outer peripheral protrusions 50 in addition to the outer peripheral protrusions 50 .
- the second inner peripheral protrusion inclined surface 60SS is formed between the inner peripheral protrusions 60 and the inner peripheral protrusions 60.
- the second outer peripheral protrusion inclined surface 50SS arranged between the side surface and the rear end surface of the screw 12 may be formed around the entire axis of the screw 12 (see FIG. 10).
- the second inner peripheral projection slope 60SS arranged between the inner peripheral surface and the front end surface of the bush 14 may be formed around the entire axis of the bush 14 (see FIG. 10).
- the second outer peripheral protrusion slope 50SS may be formed only between the outer peripheral protrusions 50 and 50 .
- the second inner peripheral protrusion slope 60SS may be formed only between the inner peripheral protrusions 60 and 60 .
- the rear end of the outer peripheral projection 50 may be positioned on the same plane as the rear end surface of the screw 12 or may be positioned forward of the rear end surface of the screw 12 . That is, the rear end of the outer peripheral projection 50 in the embodiment and Modifications 1 to 3 may be positioned forward of the rear end surface of the screw 12 as in Modification 4. Further, the rear end of the outer peripheral projection 50 in Modification 4 may be positioned on the same plane as the rear end surface of the screw 12 as in the embodiment and Modifications 1 to 3.
- the front end of the inner peripheral projection 60 may be positioned on the same plane as the front end face of the bush 14 or may be positioned behind the front end face of the bush 14 . That is, the front end of the inner peripheral projection 60 in the embodiment and Modifications 1 to 3 may be positioned behind the front end surface of the bush 14 as in Modification 4. FIG. Further, the front end of the inner peripheral projection 60 in Modification 4 may be positioned on the same plane as the front end surface of the bush 14 as in the embodiment and Modifications 1 to 3.
- a screw (12) is arranged along the front-rear direction in which the resin for injection is injected and the rearward direction opposite to the front direction, and the screw and the screw are spline-engageable.
- an injection device (10) having a bushing (14) and spline-fitting the screw and the bushing, comprising: a direct-acting motor (24) for moving the bushing back and forth with respect to the screw; a rotary motor (26) that rotates the bushing; a first detector (38) that detects the linear torque of the linear motor; a second detector (44) that detects the rotational torque of the rotary motor; a motor control unit (28) that performs control processing to control the linear motor and the rotary motor while monitoring the linear torque and the rotary torque so that the bush is spline-fitted to the screw;
- a plurality of outer peripheral projections (50) are formed on the outer peripheral surface of the rear end side of the screw and extend in the front-rear direction at intervals in the circumferential direction of the screw.
- An outer peripheral projection slope (50S) is formed so that the outer peripheral projection width (50W) along the circumferential direction of the screw becomes smaller as it goes toward the bush. It has a plurality of inner peripheral projections (60) formed on the peripheral surface and extending in the front-rear direction at intervals in the circumferential direction of the through-hole, and each of the plurality of inner peripheral projections has a through-hole extending toward the front end.
- An inner peripheral protrusion slope (60S) is formed so that the inner peripheral protrusion width (60W) along the circumferential direction of is reduced, and the motor control unit advances the bush until the direct torque exceeds the direct torque threshold.
- the control process is terminated when the direct torque exceeds the direct torque threshold.
- at least one of the bush and the screw can be rotated by the outer circumferential projection slope or the inner circumferential projection slope to guide spline engagement while advancing at least one of the bush and the screw.
- the state in which the spline fitting is guided can be grasped from the rotational torque. Therefore, spline fitting can be performed without uselessly rotating the bush, and as a result, work efficiency of spline fitting can be improved.
- the motor controller retracts the bushing by a specified distance and rotates the bushing by a specified angle, thereby rotating the bushing by a specified angle.
- the control process may be terminated. As a result, it is possible to correctly capture the state of being spline-fitted, and as a result, it is possible to terminate the control process.
- the motor control unit may advance the bush until the linear torque exceeds the linear torque threshold. As a result, it is possible to correctly detect that the spline has not yet been fitted, and as a result, the control process can be continued.
- a1 be the circumferential distance of the screw on the outer peripheral protrusion slope
- a2 be the circumferential distance of the through hole on the inner peripheral protrusion slope
- b1 be the circumferential distance of the screw at the rear end surface of the outer peripheral protrusion
- b1 be the inner
- the circumferential distance of the through hole on the front end face of the circumferential projection is b2
- the circumferential distance of the screw between the outer circumferential projection and the outer circumferential projection is c1
- the penetration between the inner circumferential projection and the inner circumferential projection is c1.
- c2 is the circumferential interval between the holes and X is the value obtained by multiplying the radius ( r) from the center line (LN2) of the through hole to the front end of the inner peripheral projection by the specified angle
- the specified angle is , b 1 +b 2 ⁇ X ⁇ a 1 +c 1 ⁇ b 2 . This allows the screw and bushing to be spline-fitted in one rotation of the bushing relative to the screw.
- a second outer peripheral projection slope (50SS) is formed so that the outer diameter of the screw decreases toward the rear end.
- a second inner peripheral projection slope (60SS) may be formed so as to increase the inner diameter of the . This reduces the situation in which the rear end face of the outer peripheral protrusion and the front end face of the inner peripheral protrusion come into contact with each other and the bush does not move forward. Therefore, the reliability of the spline fitting can be further enhanced as compared with the case where the second outer peripheral protrusion slope and the second inner peripheral protrusion slope are not formed.
- the second outer protrusion slope may be formed on the outer protrusion, and the second inner protrusion slope may be formed on the inner protrusion.
- the reliability of the spline fitting can be further enhanced compared to the case where the outer peripheral protrusion and the inner peripheral protrusion are not formed with the second outer peripheral protrusion slope and the second inner peripheral protrusion slope.
- the second outer peripheral protrusion slope may be formed between the outer peripheral protrusion and the outer peripheral protrusion, and the second inner peripheral protrusion slope may be formed between the inner peripheral protrusion and the inner peripheral protrusion.
- the spline engagement is better than when the second outer peripheral protrusion slope and the second inner peripheral protrusion slope are not formed between the outer peripheral protrusion and the inner peripheral protrusion and between the inner peripheral protrusion and the inner peripheral protrusion. Certainty can be increased.
- a screw arranged along the front-rear direction in which an injection resin is injected and a rearward direction opposite to the forward direction; a bush formed so as to be spline-fitted with the screw; A linear motion motor that moves the bush back and forth with respect to the screw, a rotary motor that rotates the bush with respect to the screw, a first detection unit that detects the linear motion torque of the linear motion motor, and rotation of the rotary motor.
- an advance step that advances the bushing until the linear torque exceeds the linear torque threshold; and if the rotational torque exceeds the rotational torque threshold before the linear torque exceeds the linear torque threshold, and an advance stop step for stopping the advance of the bushing when the torque exceeds the linear motion torque threshold, and the screw is formed on the outer peripheral surface of the rear end side of the screw and spaced apart in the circumferential direction of the screw in the front-rear direction.
- Each of the plurality of outer peripheral protrusions has a sloped outer peripheral protrusion that is inclined such that the width of the outer peripheral protrusion along the circumferential direction of the screw decreases toward the rear end
- the bushing has a through hole and a plurality of inner peripheral projections formed on the inner peripheral surface of the through hole and extending in the front-rear direction at intervals in the peripheral direction of the through hole. is formed with an inner peripheral protrusion slope that slopes so that the width of the inner peripheral protrusion along the circumferential direction of the through hole becomes smaller toward the front end.
- At least one of the bush and the screw can be rotated by the outer circumferential projection slope or the inner circumferential projection slope to guide spline engagement while advancing at least one of the bush and the screw. Also, the state in which the spline fitting is guided can be grasped from the rotational torque. Therefore, spline fitting can be performed without uselessly rotating the bush, and as a result, work efficiency of spline fitting can be improved.
- the control method includes a backward rotation step of retracting the bushing by a specified distance and rotating the bushing by a specified angle when the linear torque exceeds the linear torque threshold without the rotational torque exceeding the rotary torque threshold, and a specified and a second stop advance step of stopping advancement of the bushing if the angular rotation causes the rotational torque to exceed a rotational torque threshold.
- the control method may return to the advance step if the rotational torque does not exceed the rotational torque threshold due to rotation of the specified angle. As a result, it is possible to correctly detect that the spline has not yet been fitted, and as a result, the control process can be continued.
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
射出用樹脂を射出する前方向と、前記前方向とは逆の後方向との前後方向に沿って配置されるスクリューと、前記スクリューとスプライン嵌合可能に形成されるブッシュとを有し、前記スクリューと前記ブッシュとをスプライン嵌合させる射出装置であって、
前記スクリューに対して、前記前後方向に前記ブッシュを進退させる直動モータと、
前記スクリューに対して、前記ブッシュを回転させる回転モータと、
前記直動モータの直動トルクを検出する第1検出部と、
前記回転モータの回転トルクを検出する第2検出部と、
前記スクリューに対して前記ブッシュがスプライン嵌合するように、前記直動トルクおよび前記回転トルクを監視しながら前記直動モータおよび前記回転モータを制御する制御処理を実行するモータ制御部と、
を備え、
前記スクリューは、前記スクリューの後端側の外周面に形成され、前記スクリューの周方向に間隔をあけて前記前後方向に沿って延びる複数の外周突起を有し、
複数の前記外周突起の各々には、後端に向かうほど前記スクリューの周方向に沿った外周突起幅が小さくなるように傾斜する外周突起斜面が形成され、
前記ブッシュは、前記前後方向に延びる貫通孔と、前記貫通孔の内周面に形成され、前記貫通孔の周方向に間隔をあけて前記前後方向に沿って延びる複数の内周突起を有し、
複数の前記内周突起の各々には、前端に向かうほど前記貫通孔の周方向に沿った内周突起幅が小さくなるように傾斜する内周突起斜面が形成され、
前記モータ制御部は、前記直動トルクが直動トルク閾値を超えるまで前記ブッシュを前進させ、前記直動トルクが前記直動トルク閾値を超える前に前記回転トルクが回転トルク閾値を超えた場合には、前記直動トルクが前記直動トルク閾値を超えたときを契機として前記制御処理を終了する。
射出用樹脂を射出する前方向と、前記前方向とは逆の後方向との前後方向に沿って配置されるスクリューと、
前記スクリューとスプライン嵌合可能に形成されるブッシュと、
前記スクリューに対して、前記前後方向に前記ブッシュを進退させる直動モータと、
前記スクリューに対して、前記ブッシュを回転させる回転モータと、
前記直動モータの直動トルクを検出する第1検出部と、
前記回転モータの回転トルクを検出する第2検出部と、
を備える射出装置が、前記スクリューと前記ブッシュとがスプライン嵌合するように、前記直動トルクおよび前記回転トルクを監視しながら前記直動モータおよび前記回転モータを制御する制御方法であって、
前記直動トルクが直動トルク閾値を超えるまで前記ブッシュを前進させる前進ステップと、
前記直動トルクが前記直動トルク閾値を超える前に前記回転トルクが回転トルク閾値を超えた場合には、前記直動トルクが前記直動トルク閾値を超えたときに前記ブッシュの前進を停止させる前進停止ステップと、
を含み、
前記スクリューは、前記スクリューの後端側の外周面に形成され、前記スクリューの周方向に間隔をあけて前記前後方向に沿って延びる複数の外周突起を有し、
複数の前記外周突起の各々には、後端に向かうほど前記スクリューの周方向に沿った外周突起幅が小さくなるように傾斜する外周突起斜面が形成され、
前記ブッシュは、貫通孔と、前記貫通孔の内周面に形成され、前記貫通孔の周方向に間隔をあけて前記前後方向に沿って延びる複数の内周突起とを有し、
複数の前記内周突起の各々には、前端に向かうほど前記貫通孔の周方向に沿った内周突起幅が小さくなるように傾斜する内周突起斜面が形成される。
図1は、一実施形態による射出装置10を示す概略図である。射出装置10は、金型に対して成形用樹脂を射出する。本実施形態では、成形用樹脂を射出する射出方向は前方向とし、射出方向とは逆の方向は後方向とする。射出装置10には、スクリュー12と、ブッシュ14と、ブッシュ締結部16と、駆動機構18とが備えられる。
上記の実施形態は、以下のように変形してもよい。
図6は、変形例1のスクリュー12およびブッシュ14を示す図である。図6では、実施形態において説明した構成と同等の構成には同一の符号が付されている。なお、本変形例では、実施形態と重複する説明は割愛する。
図7は、変形例2のスクリュー12およびブッシュ14を示す図である。図7では、実施形態において説明した構成と同等の構成には同一の符号が付されている。なお、本変形例では、実施形態と重複する説明は割愛する。
図8は、変形例3のスクリュー12およびブッシュ14を示す図である。図9Aは、図8のスクリュー12の断面を示す図である。図9Bは、図8のブッシュ14の断面を示す図である。図8、図9Aおよび図9Bでは、実施形態において説明した構成と同等の構成には同一の符号が付されている。なお、本変形例では、実施形態と重複する説明は割愛する。
図10は、変形例4のスクリュー12およびブッシュ14を示す図である。図10では、実施形態において説明した構成と同等の構成には同一の符号が付されている。なお、本変形例では、実施形態と重複する説明は割愛する。
外周突起50の後端は、スクリュー12の後端面と同一面上に位置していてもよく、スクリュー12の後端面よりも前方に位置していてもよい。つまり、実施形態、変形例1~3における外周突起50の後端が、変形例4のようにスクリュー12の後端面よりも前方に位置していてもよい。また、変形例4における外周突起50の後端が、実施形態、変形例1~3のようにスクリュー12の後端面と同一面上に位置していてもよい。
上記の実施形態および変形例は、矛盾の生じない範囲で任意に組み合わされてもよい。
これにより、ブッシュおよびスクリューの少なくとも一方を前進させながら、外周突起斜面または内周突起斜面によってブッシュおよびスクリューの少なくとも一方を回転させて、スプライン嵌合を案内することができる。また、スプライン嵌合が案内されている状態を回転トルクで把握することができる。したがって、無駄にブッシュを回転させることなくスプライン嵌合することができ、この結果、スプライン嵌合の作業効率を高めることができる。
これにより、スプライン嵌合された状態にあることを正しく捕捉することができ、その結果、制御処理を終了することができる。
これにより、未だスプライン嵌合されていない状態にあることを正しく捕捉することができ、その結果、制御処理を続行することができる。
これにより、スクリューに対する1回のブッシュの回転で、スクリューとブッシュとをスプライン嵌合させることができる。
これにより、外周突起の後端面と内周突起の前端面とが接触してブッシュが前進しないといった事態が低減される。したがって、第2の外周突起斜面および第2の内周突起斜面が形成されていない場合に比べてスプライン嵌合の確実性をより高めることができる。
これにより、外周突起および内周突起に第2の外周突起斜面および第2の内周突起斜面が形成されていない場合に比べてスプライン嵌合の確実性をより高めることができる。
これにより、外周突起と外周突起との間および内周突起と内周突起との間に第2の外周突起斜面および第2の内周突起斜面が形成されていない場合に比べてスプライン嵌合の確実性をより高めることができる。
これにより、ブッシュおよびスクリューの少なくとも一方を前進させながら、外周突起斜面または内周突起斜面によってブッシュおよびスクリューの少なくとも一方を回転させて、スプライン嵌合を案内することができる。また、スプライン嵌合が案内されている状態を回転トルクで把握することができる。したがって、無駄にブッシュを回転させることなくスプライン嵌合することができ、この結果、スプライン嵌合の作業効率を高めることができる。
これにより、スプライン嵌合された状態にあることを正しく捕捉することができ、その結果、制御処理を終了することができる。
これにより、未だスプライン嵌合されていない状態にあることを正しく捕捉することができ、その結果、制御処理を続行することができる。
Claims (10)
- 射出用樹脂を射出する前方向と、前記前方向とは逆の後方向との前後方向に沿って配置されるスクリュー(12)と、前記スクリューとスプライン嵌合可能に形成されるブッシュ(14)とを有し、前記スクリューと前記ブッシュとをスプライン嵌合させる射出装置(10)であって、
前記スクリューに対して、前記前後方向に前記ブッシュを進退させる直動モータ(24)と、
前記スクリューに対して、前記ブッシュを回転させる回転モータ(26)と、
前記直動モータの直動トルクを検出する第1検出部(38)と、
前記回転モータの回転トルクを検出する第2検出部(44)と、
前記スクリューに対して前記ブッシュがスプライン嵌合するように、前記直動トルクおよび前記回転トルクを監視しながら前記直動モータおよび前記回転モータを制御する制御処理を実行するモータ制御部(28)と、
を備え、
前記スクリューは、前記スクリューの後端側の外周面に形成され、前記スクリューの周方向に間隔をあけて前記前後方向に沿って延びる複数の外周突起(50)を有し、
複数の前記外周突起の各々には、後端に向かうほど前記スクリューの周方向に沿った外周突起幅(50W)が小さくなるように傾斜する外周突起斜面(50S)が形成され、
前記ブッシュは、前記前後方向に延びる貫通孔(14H)と、前記貫通孔の内周面に形成され、前記貫通孔の周方向に間隔をあけて前記前後方向に沿って延びる複数の内周突起(60)を有し、
複数の前記内周突起の各々には、前端に向かうほど前記貫通孔の周方向に沿った内周突起幅(60W)が小さくなるように傾斜する内周突起斜面(60S)が形成され、
前記モータ制御部は、前記直動トルクが直動トルク閾値を超えるまで前記ブッシュを前進させ、前記直動トルクが前記直動トルク閾値を超える前に前記回転トルクが回転トルク閾値を超えた場合には、前記直動トルクが前記直動トルク閾値を超えたときを契機として前記制御処理を終了する、射出装置。 - 請求項1に記載の射出装置であって、
前記モータ制御部は、前記回転トルクが前記回転トルク閾値を超えずに前記直動トルクが前記直動トルク閾値を超えた場合には、前記ブッシュを規定距離だけ後退させるとともに前記ブッシュを規定角度だけ回転させ、前記規定角度の回転により前記回転トルクが前記回転トルク閾値を超えた場合には、前記制御処理を終了する、射出装置。 - 請求項2に記載の射出装置であって、
前記モータ制御部は、前記規定角度の回転により前記回転トルクが前記回転トルク閾値を超えなかった場合には、前記直動トルクが直動トルク閾値を超えるまで前記ブッシュを前進させる、射出装置。 - 請求項2または3に記載の射出装置であって、
前記外周突起斜面における前記スクリューの周方向の距離をa1とし、前記内周突起斜面における前記貫通孔の周方向の距離をa2とし、前記外周突起の後端面における前記スクリューの周方向の距離をb1とし、前記内周突起の前端面における前記貫通孔の周方向の距離をb2とし、前記外周突起と前記外周突起との間における前記スクリューの周方向の間隔をc1とし、前記内周突起と前記内周突起との間における前記貫通孔の周方向の間隔をc2とし、前記貫通孔の中心線(LN2)から前記内周突起の前端までの半径(r)に対して前記規定角度を乗算した値をXとした場合に、
前記規定角度は、b1+b2<X<a1+c1-b2の関係を満たすように定められる、射出装置。 - 請求項1~4のいずれか1項に記載の射出装置であって、
前記スクリューの後端側には、後端に向かうほど前記スクリューの外径が縮径するように傾斜する第2の外周突起斜面(50SS)が形成され、
前記ブッシュの前端側には、前端に向かうほど前記ブッシュの内径が拡径するように傾斜する第2の内周突起斜面(60SS)が形成される、射出装置。 - 請求項5に記載の射出装置であって、
前記第2の外周突起斜面は、前記外周突起に形成され、
前記第2の内周突起斜面は、前記内周突起に形成される、射出装置。 - 請求項5または6に記載の射出装置であって、
前記第2の外周突起斜面は、前記外周突起と前記外周突起との間に形成され、
前記第2の内周突起斜面は、前記内周突起と前記内周突起との間に形成される、射出装置。 - 射出用樹脂を射出する前方向と、前記前方向とは逆の後方向との前後方向に沿って配置されるスクリューと、
前記スクリューとスプライン嵌合可能に形成されるブッシュと、
前記スクリューに対して、前記前後方向に前記ブッシュを進退させる直動モータと、
前記スクリューに対して、前記ブッシュを回転させる回転モータと、
前記直動モータの直動トルクを検出する第1検出部と、
前記回転モータの回転トルクを検出する第2検出部と、
を備える射出装置が、前記スクリューと前記ブッシュとがスプライン嵌合するように、前記直動トルクおよび前記回転トルクを監視しながら前記直動モータおよび前記回転モータを制御する制御方法であって、
前記直動トルクが直動トルク閾値を超えるまで前記ブッシュを前進させる前進ステップと、
前記直動トルクが前記直動トルク閾値を超える前に前記回転トルクが回転トルク閾値を超えた場合には、前記直動トルクが前記直動トルク閾値を超えたときに前記ブッシュの前進を停止させる前進停止ステップと、
を含み、
前記スクリューは、前記スクリューの後端側の外周面に形成され、前記スクリューの周方向に間隔をあけて前記前後方向に沿って延びる複数の外周突起を有し、
複数の前記外周突起の各々には、後端に向かうほど前記スクリューの周方向に沿った外周突起幅が小さくなるように傾斜する外周突起斜面が形成され、
前記ブッシュは、貫通孔と、前記貫通孔の内周面に形成され、前記貫通孔の周方向に間隔をあけて前記前後方向に沿って延びる複数の内周突起とを有し、
複数の前記内周突起の各々には、前端に向かうほど前記貫通孔の周方向に沿った内周突起幅が小さくなるように傾斜する内周突起斜面が形成される、制御方法。 - 請求項8に記載の制御方法であって、
前記回転トルクが前記回転トルク閾値を超えることなく前記直動トルクが前記直動トルク閾値を超えた場合には、前記ブッシュを規定距離だけ後退させるとともに前記ブッシュを規定角度だけ回転させる後退回転ステップと、
前記規定角度の回転により前記回転トルクが前記回転トルク閾値を超えた場合には、前記ブッシュの前進を停止させる第2の前進停止ステップと、
を含む、制御方法。 - 請求項9に記載の制御方法であって、
前記規定角度の回転により前記回転トルクが前記回転トルク閾値を超えなかった場合には、前記前進ステップに戻る、制御方法。
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JP2018044642A (ja) * | 2016-09-15 | 2018-03-22 | 株式会社リコー | 駆動伝達装置および画像形成装置 |
JP2019055488A (ja) * | 2017-09-20 | 2019-04-11 | ファナック株式会社 | 射出成形機および射出成形機の制御方法 |
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JP2018044642A (ja) * | 2016-09-15 | 2018-03-22 | 株式会社リコー | 駆動伝達装置および画像形成装置 |
JP2019055488A (ja) * | 2017-09-20 | 2019-04-11 | ファナック株式会社 | 射出成形機および射出成形機の制御方法 |
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