JP2010058299A - Injection control device and injection control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain a mold inner pressure when the filling of a molding material is ended and improve a quality of a molded article. <P>SOLUTION: An injection control device has an injection member disposed in a cylinder member, a drive part for injection for advancing the injection member, and a control part 71 which controls the drive part, and advances the injection member by performing speed control from an injection starting position to a speed control ending position. When the volume of the molding material pushed by the injection member while the injection member is advanced from the injection starting position to the speed control ending position is assumed as a pushing amount Ws, and the volume of the molding material going from the inlet port of a mold device to a cavity space when the injection member reaches the speed control ending position is assumed as Wm1, the control part 71 controls so as to be Ws>Wm1. The injection member is stopped at the speed control ending position before being completely filled with the molding material, and therefore the mold inner pressure can be maintained at an appropriate value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an injection control device and an injection control method.

  Conventionally, in a molding machine, for example, an injection molding machine, a resin as a molding material heated and melted in a heating cylinder is injected at a high pressure and filled in a cavity space of a mold apparatus, and in the cavity space. A molded product is obtained by being cooled and solidified.

  For this purpose, the injection molding machine includes a mold clamping device, an injection device, and the mold device, and the mold clamping device includes a fixed platen and a movable platen, and the movable platen is advanced and retracted by a mold clamping cylinder. The mold apparatus is closed, clamped and opened.

  On the other hand, the injection device includes the heating cylinder, an injection nozzle disposed at the front end of the heating cylinder, a screw disposed in the heating cylinder so as to be rotatable and movable back and forth, and the like. When the screw is rotated by driving a metering motor connected to the rear end of the screw during the weighing process, the resin supplied from the hopper is moved forward in the heating cylinder, heated and melted. And collected in front of the screw head. At this time, the screw is retracted. Subsequently, when the screw is advanced by driving an injection motor connected to the rear end of the screw during the injection process, the resin accumulated in front of the screw head is injected from the injection nozzle and into the cavity space. Filled.

  For this purpose, during the injection process, the speed at which the screw is advanced to inject the resin, that is, the speed control for controlling the injection speed is performed, and during that time, the pressure of the resin filled in the cavity space, that is, the in-mold pressure is controlled. An injection apparatus is provided that detects and detects that the mold internal pressure reaches a predetermined value, and starts a pressure holding process to switch from speed control to pressure control for controlling the mold internal pressure (see, for example, Patent Document 1). ).

  By the way, in the said injection apparatus, when a pressure holding process is started, a screw may reverse | retreat.

  FIG. 2 is a diagram showing the operation of a conventional injection molding machine.

  In the figure, Vs' is the injection speed. When the injection process is started at timing t11, the screw is advanced at the injection speed Vs', and the pressure holding process is started at timing t12. At this time, if the force with which the resin pushes the screw is greater than the force with which the screw pushes the resin, the screw is retracted, and the injection speed Vs' takes a negative value. As a result, the in-mold pressure is lowered, sink marks are generated in the molded product, and the quality of the molded product is deteriorated.

Therefore, the holding pressure when the pressure holding process is started is set sufficiently high to prevent the screw from moving backward.
JP 2008-126533 A

  However, in the conventional injection device, when the holding pressure is increased, it is difficult to maintain the mold internal pressure at an appropriate value. If the mold internal pressure becomes higher than the appropriate value, the molded product may be burred, warped, etc. Will occur and the quality of the molded product will deteriorate. In particular, when the molded product is thin or small, the quality of the molded product is significantly deteriorated.

  The present invention solves the problems of the conventional injection device, can maintain the in-mold pressure at the time when filling of the molding material is completed, and can improve the quality of the molded product. It is an object to provide a control device and an injection control method.

  Therefore, in the injection control device of the present invention, an injection member that is rotatably and reciprocally disposed within the cylinder member, an injection drive unit for advancing the injection member, and the drive And a controller that advances the injection member by performing speed control from the injection start position to the speed control end position.

Then, the control unit sets the amount by which the molding material is pushed by the injection member while the injection member is advanced from the injection start position to the speed control end position as an indentation amount Ws, and the injection member reaches the speed control end position. When the volume of the molding material that has entered the cavity space from the entrance of the mold apparatus is Wm1,
Ws> Wm1
Control is performed as follows.

  According to the present invention, in the injection control device, an injection member that is rotatably and reciprocally disposed within the cylinder member, an injection drive unit for advancing the injection member, and the drive And a controller that advances the injection member by performing speed control from the injection start position to the speed control end position.

Then, the control unit sets the amount by which the molding material is pushed by the injection member while the injection member is advanced from the injection start position to the speed control end position as an indentation amount Ws, and the injection member reaches the speed control end position. When the volume of the molding material that has entered the cavity space from the entrance of the mold apparatus is Wm1,
Ws> Wm1
Control is performed as follows.

  In this case, since the injection member is stopped at the speed control end position before the filling of the molding material is performed, the pressure inside the mold can be maintained at an appropriate value, and the molded product has a sink, burr, It is possible to prevent warping and the like from occurring. Therefore, the quality of the molded product can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 3 is a conceptual diagram of the injection apparatus according to the first embodiment of the present invention.

  In the figure, 10 is an injection device, 11 is a heating cylinder as a cylinder member, 12 is a screw as an injection member that is rotatably and reciprocally arranged in the heating cylinder 11, and 13 is the heating cylinder 11. An injection nozzle disposed at the front end of the nozzle, 14 is a nozzle port formed in the injection nozzle 13, and 16 is attached to a resin supply port formed in the vicinity of the rear end of the heating cylinder 11, and a resin as a molding material. Is a hopper that accommodates and supplies the heat into the heating cylinder 11. The screw 12 includes a screw head 27 at the front end.

  A heater (not shown) for heating the resin through the heating cylinder 11 is disposed on the outer periphery of the heating cylinder 11, and a predetermined portion of the heating cylinder 11 (in this embodiment, the front end, the center, and the rear At the end, a temperature sensor (not shown) is disposed as a resin temperature detection unit for detecting the temperature of the resin by detecting the temperature of the heating cylinder 11.

  By the way, the rear end of the heating cylinder 11 is attached to a front injection support 31 as a first fixed support member, and a rear injection support as a second fixed support member at a predetermined distance from the front injection support 31. 32 is disposed. A guide bar 33 is installed between the front injection support 31 and the rear injection support 32, and a pressure plate 34 as a movable support member is disposed along the guide bar 33 so as to freely advance and retract. The front injection support 31 and the rear injection support 32 are fixed to a slide base (not shown) with bolts (not shown).

  A drive shaft 35 as a transmission shaft is connected to the rear end of the screw 12, and the drive shaft 35 is rotatably supported by the pressure plate 34 by bearings 36 and 37. A metering motor 41 as a metering drive unit composed of an electric servo motor is attached to the pressure plate 34, and between the metering motor 41 and the drive shaft 35, pulleys 42 and 43 and a rotational transmission member are provided. A first rotation transmission unit composed of the timing belt 44 is provided. By driving the metering motor 41, the screw 12 can be rotated in the forward direction or the reverse direction. In this embodiment, the measuring motor 41 is used as the measuring drive unit. However, a hydraulic motor can be used instead of the measuring motor 41.

  A ball screw 47 including a ball screw shaft 45 and a ball nut 46 screwed to each other is disposed behind the pressure plate 34, and the ball screw 47 causes the ball screw shaft 45 to rotate. A movement direction conversion unit for converting the nut 46 into a straight movement is configured. The ball screw shaft 45 forms a first conversion element, and the ball nut 46 forms a second conversion element.

  The ball screw shaft 45 is rotatably supported by the bearing 48 with respect to the rear injection support 32, and the ball nut 46 is fixed to the pressure plate 34 via a plate 51 and a load cell 52 as a pressure detector. Is done. The load cell 52 can detect the pressure of the resin in the heating cylinder 11, that is, the pressure of the resin, and the force with which the screw 12 pushes the resin, that is, the radiant power.

  In addition, an injection motor 53 as an injection drive unit composed of an electric servo motor is attached to the rear injection support 32, and between the injection motor 53 and the ball screw shaft 45, pulleys 54 and 55 and rotational transmission. A second rotation transmission unit comprising a timing belt 56 as a body is provided. By driving the injection motor 53 and rotating the ball screw shaft 45, the ball nut 46 and the pressure plate 34 can be advanced and retracted, and accordingly, the screw 12 can be advanced and retracted (moved in the horizontal direction in the figure). In this embodiment, the injection motor 53 is used as the injection drive unit. However, a hydraulic injection cylinder can be used instead of the injection motor 53.

  In the injection apparatus 10 configured as described above, the control unit 71 controls the measuring motor 41, the injection motor 53, and the like according to the contents set by the setting device 72. Further, an encoder 61 as a first magnetic pole position detector for detecting the magnetic pole position θm of the measuring motor 41 serves as a second magnetic pole position detector for detecting the magnetic pole position θi of the injection motor 53. An encoder 62 is provided, and the magnetic pole positions θm and θi are sent to the control unit 71. The heating cylinder 11, the screw 12, the injection motor 53, the control unit 71, and the like constitute an injection control device.

  Then, during the weighing process, a weighing processing unit (weighing processing unit) (not shown) of the control unit 71 performs weighing processing and drives the weighing motor 41 to rotate the screw 12 in the forward direction. The resin enters the heating cylinder 11 and moves forward (moves to the left in the figure) in a groove (not shown), is melted by the heater, and accumulates in front of the screw head 27 (to the left in the figure). It is done. Accordingly, the screw 12 is retracted (moved to the right in the figure).

  Subsequently, when the screw 12 is advanced during the injection process, the resin stored in front of the screw head 27 is injected from the injection nozzle 13 and filled into a cavity space (not shown) of the mold apparatus 80.

  By the way, during the injection process, speed control is performed to control the injection speed, and during that time, the mold internal pressure in the cavity space is detected, and when the mold internal pressure reaches a predetermined value, the pressure holding process is started. As the pressure holding process starts, the screw 12 may be retracted. When the screw 12 is retracted, the pressure inside the mold is lowered, sink marks are generated in the molded product, and the quality of the molded product is deteriorated.

  On the other hand, it is conceivable to prevent the in-mold pressure from being lowered by setting the holding pressure high when the pressure-holding process is started. However, it is possible to maintain the mold pressure at an appropriate value. If the pressure inside the mold is higher than an appropriate value, burrs, warpage and the like occur in the molded product, and the quality of the molded product is deteriorated.

  Therefore, in the present embodiment, at a predetermined timing before the pressure holding process is started, the injection speed is lowered with a predetermined deceleration pattern, and the screw 12 is stopped at a predetermined speed control end position, thereby maintaining the pressure. The screw 12 does not move backward with the start of the pressing step, and the in-mold pressure is set to an appropriate value.

  FIG. 4 is a conceptual diagram showing a state in which the resin according to the first embodiment of the present invention is filled.

  In the figure, 10 is an injection device, 11 is a heating cylinder, 12 is a screw, 13 is an injection nozzle, 80 is a mold device, 81 is a resin flow path section such as a sprue, runner, and gate, and C is a cavity space.

  As shown in FIG. 4A, when the backward limit position of the screw 12 is the injection start position Qa, the resin Rn is pushed by the heating cylinder 11 when the screw 12 starts to advance at the injection start position Qa. Injected from the injection nozzle 13, enters the mold apparatus 80, passes through the resin flow path portion 81, and is filled into the cavity space C. In this case, since the cross-sectional areas of the injection nozzle 13 and the resin flow path portion 81 are smaller than the cross-sectional area of the heating cylinder 11, the resin Rn is advanced in the heating cylinder 11 in a compressed state and is injected from the injection nozzle 13. After passing through the resin flow path portion 81, it expands as it enters the cavity space C, and advances in the cavity space C. Note that the position of the screw 12 may be a position where any part of the screw 12 is placed, but in the present embodiment, the position where the front end of the screw 12 is placed.

  Thereafter, the screw 12 is stopped. Subsequently, when the pressure holding process is started, if the force by which the resin Rn pushes the screw 12 is greater than the force by which the screw 12 pushes the resin Rn, the screw 12 is retracted. The injection speed takes a negative value. As a result, when the in-mold pressure becomes low and an appropriate value cannot be maintained, sink marks are generated in the molded product, and the quality of the molded product is degraded. On the other hand, it is conceivable to set the holding pressure sufficiently high when the pressure holding process is started. However, when the holding pressure is set high, it is difficult to maintain the in-mold pressure at an appropriate value. If the in-mold pressure is higher than an appropriate value, burrs, warpage, and the like occur in the molded product, and the quality of the molded product decreases.

  Therefore, in the present embodiment, as shown in FIG. 4B, the position of the screw 12 is maintained until the tip of the resin Rn in the cavity space C reaches the innermost part of the cavity space C. It has come to be.

  Therefore, when the speed control end position Qe of the screw 12 is set, the screw 12 is stopped at the speed control end position Qe, and the position of the screw 12 is held, the inside of the heating cylinder 11 is compressed. The resin Rn continues to be filled into the cavity space C through the injection nozzle 13 and the resin flow path portion 81 due to expansion, and the tip of the resin Rn is the deepest in the cavity space C as shown in FIG. And complete filling, i.e., complete filling is performed. When the resin pressure and the mold internal pressure become equal, the filling of the resin Rn in the heating cylinder 11 into the cavity space C through the injection nozzle 13 and the resin flow path portion 81 is stopped.

  Note that when the screw 12 reaches the speed control end position Qe, the position of the screw 12 is held. However, holding the position includes limiting the forward / reverse speed of the screw 12.

By the way, after the screw 12 starts to advance at the injection start position Qa, it is advanced by the screw stroke Ls in the heating cylinder 11 until it is stopped at the speed control end position Qe. The resin Rn is pushed in and moved forward. The volume at which the resin Rn is pushed by the screw 12 at this time is defined as an indentation amount Ws, and the resin from the inlet of the mold apparatus 80 (in the present embodiment, an inlet of a sprue not shown) ahead of the speed control end position Qe When the volume of the resin Rn that has entered the flow path portion 81 and the cavity space C is Wm1,
Ws> Wm1
The speed control end position Qe is set so that Specifically, the filling rate of the resin Rn to the cavity space C is controlled to be less than 100 [%]. The speed control end position Qe is set when the operator operates the control unit 71. Here, the indentation amount Ws is set to be substantially equal to the volume Wt of the resin flow path portion 81 and the cavity space C from the inlet of the mold apparatus 80 in consideration of the contraction accompanying the cooling of the resin Rn. .

  Then, after the screw 12 reaches the speed control end position Qe, the position of the screw 12 is held. As a result, the volume Wm2 of the resin Rn when entering the resin flow path portion 81 and the cavity space C from the inlet of the mold apparatus 80 and being completely filled increases due to expansion, and the pushing amount Ws and the volume Wm2 Are almost equal. That is, the filling rate of the resin Rn to the cavity space C is 100%.

  Thereafter, the pressure holding process is started, and a uniform pressure is applied to the resin Rn filled in the cavity space C.

  Therefore, the in-mold pressure after complete filling can be made equal to the resin pressure (pressure adjusted at zero point) when the injection process is started.

  As a result, when the pressure holding control unit (not shown) of the control unit 71 starts the pressure holding process after complete filling, the screw 12 does not move backward with the start of the pressure holding process. And since the mold internal pressure does not become low and it is possible to prevent sink marks from occurring in the molded product, the quality of the molded product can be improved.

  In addition, when the pressure holding process is started, it is not necessary to set the holding pressure high, so that the pressure inside the mold can be maintained at an appropriate value, and the occurrence of burrs, warpage, etc. in the molded product is prevented. And the quality of the molded product can be improved. Note that after the pressure holding step is started, pressure control is performed based on the resin pressure detected by the load cell 52.

  In the present embodiment, a cold runner that takes into account the resin flow path portion 81 taken out together with the molded product has been described as a runner. However, when a hot runner is used, the resin Rn is contained in the runner of the resin flow path portion 81. In this case, the parting surface of the mold apparatus 80 is formed at the entrance of the mold apparatus 80 in the present embodiment.

  By the way, in order to stop the screw 12 at the speed control end position Qe, it is necessary to start decelerating the screw 12 at a predetermined position behind the speed control end position Qe. Therefore, in the present embodiment, a deceleration pattern for decelerating the screw 12 is set, and when the screw 12 is decelerated with the deceleration pattern, the screw 12 is accurately stopped at the speed control end position Qe. A deceleration start position Qs is set. The deceleration start position Qs is set by being calculated by the control unit 71.

  Next, the operation of the control unit 71 will be described.

  FIG. 1 is a control block diagram showing a control unit in the first embodiment of the present invention, and FIG. 5 is a diagram showing the operation of the injection molding machine in the first embodiment of the present invention.

  In the figure, 64 is a speed generator that reads the magnetic pole position θi sent from the encoder 62 (FIG. 3) and calculates the actual injection speed as the actual injection speed Vr based on the rate of change of the magnetic pole position θi, The position generation unit reads the magnetic pole position θi and calculates the actual position of the screw 12 as the actual position Qr. In this case, a speed index and a position index are constituted by the magnetic pole position θi.

  In the present embodiment, when the injection process is started at timing t1, the screw 12 is advanced at the injection speed Vs set in advance by the operator in the setting device 72 (FIG. 3). That is, when the operator sets the injection speed Vs in the setting device 72, the setting device 72 sends the injection speed Vs to the control unit 71. In the control unit 71, the injection speed Vs is sent to a subtractor 67 as a deviation calculation unit via a switch SW as a switching unit, and the subtracter 67 reads the actual injection speed Vr from the speed generation unit 64, A deviation ΔV between the actual injection speed Vr and the injection speed Vs is calculated, and the deviation ΔV is sent to the speed control calculation unit 68. The speed control calculation unit 68 generates a current command value i based on the deviation ΔV.

  Therefore, the currents Iu, Iv, Iw generated based on the current command value i are supplied to the injection motor 53, the injection motor 53 is driven, and the screw 12 is advanced at the injection speed Vs. Accordingly, the resin pressure P in the heating cylinder 11 gradually increases. In this case, the subtractor 67 functions as an injection control unit.

  By the way, when the screw 12 reaches the deceleration start position Qs at the timing t2, the screw 12 is decelerated by the deceleration pattern Vp.

  For this purpose, a deceleration pattern generation unit 66 is provided. The deceleration pattern generation unit 66 reads the speed control end position Qe set by the operator in the setting device 72 and stops the screw 12 at the speed control end position Qe. The deceleration pattern Vp is generated so that the position of the screw 12 can be maintained, that is, the injection speed becomes zero (0) at the speed control end position Qe. The deceleration pattern Vp is set in consideration of the thickness of the molded product and the type of the resin Rn so that the resin pressure P in the heating cylinder 11 takes a constant value while the screw 12 is decelerated. Is done.

  The deceleration pattern Vp is represented by each position Qx of the screw 12 between the deceleration start position Qs and the speed control end position Qe, and the injection speed V (Qx) at each position Qx. Qx) is set to change in a predetermined shape (in a straight line in FIG. 5) by a predetermined function.

  Reference numeral 69 denotes a deceleration start position arrival determination unit that determines whether or not the screw 12 has reached the deceleration start position Qs. The deceleration start position arrival determination unit 69 receives the deceleration in the deceleration pattern Vp from the deceleration pattern generation unit 66. The actual position Qr is read from the position generator 65 as the start position Qs, and it is determined whether or not the screw 12 has reached the deceleration start position Qs while the screw 12 is advanced at the injection speed Vs.

  Subsequently, when the screw 12 reaches the deceleration start position Qs at the timing t2, the deceleration start position arrival determination unit 69 switches the switch SW. As a result, the injection speed V (Qx) of the deceleration pattern Vp generated in the deceleration pattern generation unit 66 is sent to the subtracter 67 via the switch SW, and the subtractor 67 outputs the injection speed corresponding to the actual position Qr. V (Qx) is read, a deviation ΔV between the actual injection speed Vr and the injection speed V (Qx) is calculated, and the deviation ΔV is sent to the speed control calculation unit 68. The speed control calculation unit 68 is based on the deviation ΔV. Current command value i is generated.

  In the present embodiment, the subtractor 67 reads the deceleration pattern Vp generated by the deceleration pattern generation unit 66, but the deceleration pattern Vp generated by the deceleration pattern generation unit 66 is not shown in advance. The deceleration pattern Vp can be read out from the storage device by being recorded in the storage device.

  Therefore, the currents Iu, Iv, Iw generated based on the current command value i are supplied to the injection motor 53, the injection motor 53 is driven, and the screw 12 is advanced at the injection speed V (Qx). The vehicle is decelerated according to the deceleration pattern Vp, reaches the speed control end position Qe at the timing t3, and is stopped. In this case, the subtractor 67 functions as a deceleration control unit.

  It should be noted that the resin pressure P in the heating cylinder 11 takes a constant value from the start of deceleration of the screw 12 at timing t2 until the screw 12 reaches the speed control end position Qe at timing t3.

  As described above, when the screw 12 is stopped, the compressed resin Rn in the heating cylinder 11 continues to be filled into the cavity space C through the injection nozzle 13 and the resin flow path portion 81 as described above. When the tip of the resin Rn reaches the innermost part of the cavity space C and complete filling is performed, the filling of the cavity space C is completed at timing t4. Meanwhile, the resin pressure P gradually decreases and becomes zero at timing t4.

  Therefore, a filling end determination processing unit (not shown) of the control unit 71 reads the resin pressure P detected by the load cell 52, and fills depending on whether the resin pressure P has become a predetermined value, or zero in the present embodiment. Determine whether has finished. And when filling is complete | finished, the said pressure-holding control part starts a pressure-holding process.

  When the thickness of the molded product is large, the screw 12 starts injection at a timing t1 ′ earlier than the timing t1 and advances at an injection speed Vs ′ equal to the injection speed Vs, as shown by a broken line in FIG. Then, deceleration is started at timing t2 ′ earlier than timing t2, and is slowly decelerated with a deceleration pattern Vp ′ having a smaller change rate than the deceleration pattern Vp. Therefore, when the thickness of the molded product is large, the injection start position Qa 'and the deceleration start position Qs' are set behind the injection start position Qa and the deceleration start position Qs.

  Thus, in the present embodiment, the screw 12 is stopped at the speed control end position Qe before the resin Rn is completely filled, so that the in-mold pressure can be maintained at an appropriate value, and molding is performed. It is possible to prevent sinks, burrs, warpage, etc. from occurring in the product. Therefore, the quality of the molded product can be improved.

  Further, since the speed control end position Qe of the screw 12 can be directly set by the setting device 72, the speed control end position Qe of the screw 12 can be set accurately. Therefore, since the amount Wm of the resin Rn entering the cavity space C from the entrance of the mold apparatus 80 can be set with high accuracy, the filling amount (shot volume) of the resin Rn can be accurately managed. As a result, the quality of the molded product can be stabilized.

  Next, a second embodiment of the present invention in which the deceleration start position Qs of the screw 12 can be directly set by the setting device 72 will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 6 is a control block diagram showing a control unit in the second embodiment of the present invention.

  In this case, since the operator does not set the speed control end position Qe but sets the deceleration start position Qs in the setting device 72 (FIG. 3), the deceleration pattern generation unit 66 performs injection based on the deceleration start position Qs. While the screw 12 as a member is decelerated, the deceleration pattern Vp is set in consideration of the thickness of the molded product, the type of the resin Rn, etc. so that the resin pressure P takes a constant value. The point at which the injection speed becomes zero in the deceleration pattern Vp is set as the speed control end position Qe.

  The deceleration start position arrival determination unit 69 reads the deceleration start position Qs set by the operator from the setting device 72 and the actual position Qr from the position generation unit 65, and the screw 12 is advanced at the injection speed Vs. Meanwhile, it is determined whether or not the screw 12 has reached the deceleration start position Qs.

  Thus, in the present embodiment, the deceleration start position Qs of the screw 12 can be directly set by the setting device 72, so that the deceleration start position Qs of the screw 12 can be set accurately. Therefore, it is possible to accurately manage the force of pushing the resin by the screw 12 from when the deceleration of the screw 12 is started to when it is stopped. As a result, the in-mold pressure can be stabilized. In particular, as shown by the broken line in FIG. 4, when a thick molded product is molded, the deceleration start position Qs can be set corresponding to the increase in the resin pressure.

  In each of the above embodiments, the deceleration start position arrival determination unit 69 sets the deceleration pattern Vp in consideration of the thickness of the molded product, the type of the resin Rn, etc., but the operator sets it. By operating the device 72, the deceleration pattern generation unit 66 can generate a predetermined deceleration pattern. In that case, the generated deceleration pattern is recorded in the storage device.

  In each of the above embodiments, the resin pressure P is detected by the load cell 52. However, a pressure sensor is disposed in the vicinity of the injection nozzle 13 in the heating cylinder 11, and the resin pressure is detected by the pressure sensor. Can be detected.

  The present invention is not limited to the embodiments described above, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

It is a control block diagram which shows the control part in the 1st Embodiment of this invention. It is a figure which shows operation | movement of the conventional injection molding machine. It is a conceptual diagram of the injection apparatus in the 1st Embodiment of this invention. It is a conceptual diagram which shows the state with which the resin in the 1st Embodiment of this invention is filled. It is a figure which shows operation | movement of the injection molding machine in the 1st Embodiment of this invention. It is a control block diagram which shows the control part in the 2nd Embodiment of this invention.

Explanation of symbols

11 Heating cylinder 12 Screw 53 Injection motor 71 Control unit 80 Mold device C Cavity space Qa Injection start position Qe Speed control end position Rn Resin

Claims (9)

(A) an injection member disposed rotatably and reciprocally in the cylinder member;
(B) an injection drive for advancing the injection member;
(C) having a control unit that controls the drive unit to perform speed control from an injection start position to a speed control end position to advance the injection member;
(D) The control unit sets the volume into which the molding material is pushed by the injection member while the injection member is advanced from the injection start position to the speed control end position as an indentation amount Ws, and sets the injection member to the speed control end position. When the volume of the molding material that has entered the cavity space from the entrance of the mold apparatus when reaching is Wm1,
Ws> Wm1
An injection control device that performs control so that   When the volume of the molding material increased by the expansion of the molding material after the injection member reaches the speed control end position is set to Wm2, the control unit is configured so that the pushing amount Ws and the volume Wm2 are substantially equal. The injection control apparatus according to claim 1, wherein the position of the injection member is held.   The injection control device according to claim 1, wherein a deceleration start position is set behind the speed control end position. (A) a deceleration pattern generation unit that generates a deceleration pattern of the injection speed from the deceleration start position to the speed control end position;
(B) a deceleration start position arrival determination unit that determines whether the injection member has reached the deceleration start position;
The injection control apparatus according to claim 3, further comprising: a deceleration control unit configured to decelerate the injection member with the deceleration pattern when the injection member reaches a deceleration start position.   The injection control device according to claim 4, wherein the deceleration pattern generation unit generates a deceleration pattern based on a speed control end position set by a setting device.   The injection control device according to claim 4, wherein the deceleration pattern generation unit generates a deceleration pattern based on a deceleration start position set by a setting device. (A) an injection member disposed rotatably and reciprocally in the cylinder member;
(B) an injection drive for advancing the injection member;
(C) having a control unit that controls the drive unit to perform speed control from an injection start position to a speed control end position to advance the injection member;
(D) The control unit sets the amount by which the molding material is pushed by the injection member while the injection member is advanced from the injection start position to the speed control end position as an indentation amount Ws, from the inlet of the mold apparatus to the cavity space. When the volume of Wt is Wt, the indentation amount Ws is substantially equal to the volume Wt, and the filling rate of the molding material in the cavity space when the injection member reaches the speed control end position is 100 [%. ] An injection control device that performs control so as to be less than   After the injection member reaches the speed control end position, the control unit holds the position of the injection member so that the filling rate of the molding material with respect to the cavity space becomes 100% due to the expansion of the molding material. The injection control device according to claim 7. In an injection control method of an injection molding machine having an injection member arranged to be rotatable and reciprocating in a cylinder member, and an injection drive unit for advancing the injection member,
(A) controlling the drive unit, performing speed control from an injection start position to a speed control end position to advance the injection member,
(B) The volume at which the molding material is pushed by the injection member while the injection member is advanced from the injection start position to the speed control end position is defined as an indentation amount Ws, and the gold when the injection member reaches the speed control end position. When the volume of the molding material that has entered the cavity space from the entrance of the mold apparatus is Wm1,
Ws ≧ Wm1
An injection control method characterized in that control is performed so that

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