JP4974235B2 - Injection molding machine and molding method - Google Patents

Description

  The present invention relates to an injection molding machine and a molding method.

  Conventionally, in a molding machine, for example, an injection molding machine, a resin heated and melted in a heating cylinder as a cylinder member is injected at a high pressure to fill the cavity space of the mold apparatus, and in the cavity space. A molded product can be obtained by cooling and solidifying.

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

  On the other hand, the injection device is generally an in-line screw type, and includes the heating cylinder that heats and melts the resin supplied from the hopper, and the injection cylinder that injects the molten resin. A screw is rotatably disposed in the interior of the screw. Then, the resin is injected from the injection nozzle by moving the screw forward by a drive unit connected to the rear end, and the resin is weighed by moving backward by the drive unit.

  By the way, in the injection device, a resin charging part is formed to supply the resin to the heating cylinder, and the resin charging part includes a hopper for containing the resin, a guiding part for guiding the resin, and an amount of the resin in the guiding part. A level gauge that detects the amount of resin and an opening / closing valve that is opened and closed based on the detection result of the amount of resin are disposed, and the amount of resin in the guide portion is detected by the level gauge. When the amount of resin decreases as injection and metering are repeated, the opening / closing valve is opened, and the resin in the hopper is supplied to the guide portion.

  However, when the resin supplied from the hopper accumulates in the supply unit and the resin state in the supply unit becomes dense, shear heat is generated in the resin, so that the resin is carbonized and the carbonized resin is mixed into the molded product as an impurity. Resulting in.

  Moreover, when the state of the resin in the supply unit becomes dense, not only the frictional resistance between the inner peripheral surface of the heating cylinder and the resin increases in the weighing process, but also the frictional resistance fluctuates. Therefore, a sufficient amount of resin cannot be measured, and the amount of resin to be measured varies, and the quality of the molded product is deteriorated.

Therefore, a molding condition setting device is provided, and in the supply unit, the amount of resin supplied from the hopper to the heating cylinder is reduced, and the starvation is measured. Is formed to form a sparse state, that is, a starvation state (see, for example, Patent Document 1).
JP 2004-50415 A

  However, in the conventional injection device, the amount of resin to be weighed, the amount of resin supplied from the hopper to the heating cylinder, etc. are calculated, and a starvation state is formed based on the calculation result. Since it is necessary for a person to form a starvation state based on experience while monitoring the quality of a molded article, it becomes difficult to form an appropriate starvation state, and the work is complicated.

  The present invention provides an injection molding machine and a molding method capable of solving the problems of the conventional injection apparatus, forming an appropriate starvation state in a cylinder member, and simplifying the operation. With the goal.

  Therefore, in the injection molding machine of the present invention, a cylinder member, an injection member that is rotatably and reciprocally disposed in the cylinder member, and a molding formed at a predetermined location of the cylinder member. A molding material supply device that is connected to the material supply port and supplies the molding material into the cylinder member, and a metering drive for advancing the metering of the molding material in the cylinder member by rotating the injection member An injection drive unit for advancing the cylinder member to inject the molding material, a supply drive unit for supplying the molding material into the cylinder member, and an injection member in the cylinder member In the vicinity of the molding material supply port based on a predetermined monitoring variable when the metering drive unit and the supply drive unit are driven with the position of It has a state determination processing means for determining the state of charge, based on the state of the molding material, and an initial setting value setting processing means for changing the predetermined control variable to set the initial set values of the control variables.

  According to the present invention, in an injection molding machine, a cylinder member, an injection member that is rotatably and reciprocally disposed in the cylinder member, and a molding formed at a predetermined location of the cylinder member A molding material supply device that is connected to the material supply port and supplies the molding material into the cylinder member, and a metering drive for advancing the metering of the molding material in the cylinder member by rotating the injection member An injection drive unit for advancing the cylinder member to inject the molding material, a supply drive unit for supplying the molding material into the cylinder member, and an injection member in the cylinder member The molding material in the vicinity of the molding material supply port based on a predetermined monitoring variable when the metering drive unit and the supply drive unit are driven with the position of It has a state determination processing means for determining the state, based on the state of the molding material, and an initial setting value setting processing means for changing the predetermined control variable to set the initial set values of the control variables.

  In this case, based on a predetermined monitoring variable when the metering drive unit and the supply drive unit are driven in a state where the position of the injection member in the cylinder member is held, the molding material supply port Since the state of the molding material in the vicinity is determined, the predetermined control variable is changed based on the state of the molding material, and the initial setting value of the control variable is set. It is possible to easily form a proper starvation state in the inside. In addition, in the initial setting, it is not necessary for the operator to form a starvation state based on experience while monitoring the quality of the molded product, so that the operation for forming the starvation state can be simplified.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, an injection molding machine as a molding machine will be described.

  FIG. 2 is a first view showing an injection apparatus according to the first embodiment of the present invention, and FIG. 3 is a second view showing the injection apparatus according to the first embodiment of the present invention.

  In the figure, 31 is an in-line screw type injection device arranged in an injection molding machine. The injection molding machine includes a mold device, a mold clamping device, and the injection device 31 (not shown). The mold device is a fixed mold as a first mold and a movable mold as a second mold. The mold clamping device includes a fixed platen to which the fixed mold is attached, and a movable platen to which a movable die is attached, and the mold clamping cylinder moves the movable platen forward and backward to move the mold of the mold device. Closing, mold clamping and mold opening are performed.

  The injection device 31 is arranged so as to be rotatable and movable back and forth within the heating cylinder 17 as a cylinder member, the injection nozzle 18 as a nozzle member disposed at the front end of the heating cylinder 17, and the heating cylinder 17. Screw 20 as an injection member provided and as a metering member, heaters h11 to h13 as heating members attached to the outer periphery of the heating cylinder 17, and a driving device 101 disposed behind the heating cylinder 17 Etc. Note that a temperature detection hole d1 for detecting the temperature of the heating cylinder 17 is formed at a predetermined portion of the heater h13, in the present embodiment, in the center in the uppermost axial direction, and through the hole d1. In the present embodiment, two temperature sensors so and si are embedded as temperature detecting units. The temperature sensor so is disposed in the vicinity of the outer peripheral surface of the heating cylinder 17 and constitutes an outer detection portion, and the temperature sensor si is disposed in the vicinity of the inner peripheral surface of the heating cylinder 17 and constitutes an inner detection portion.

  The screw 20 includes a screw main body 52 as an injection member main body, and an injection portion 46 disposed in front of the screw main body 52, and is connected to the driving device 101 via a shaft portion 51 at the rear end. The screw body 52 includes a flight part 45 as a plasticizing part, and a pressure member 54 detachably disposed at the front end with respect to the flight part 45. The flight part 45 includes a rod-like body part 45a, And a spiral flight 53 formed so as to protrude from the outer peripheral surface of the main body portion 45 a, and a spiral groove 67 is formed along the flight 53.

  The pressure member 54 is formed adjacent to the backflow prevention device 62 in a predetermined range ahead of the front end of the flight part 45, and forms a flat region on the surface over a predetermined distance.

  The injection portion 46 includes a head portion 55 having a conical portion at the tip, a rod portion 56 formed adjacent to the rear of the head portion 55, and a reverse disposed around the rod portion 56. It comprises a stop ring 57 and a seal ring 58 attached to the front end of the pressure member 54. The head portion 55, the rod portion 56, and a screw portion (not shown) allow the screw head as the injection member head portion to flow back, and the check ring 57 and the seal ring 58 allow the resin as the molding material to flow back during the injection process. A backflow prevention device 62 for preventing is configured.

  Then, when the screw 20 is retracted during the measuring step, the check ring 57 is moved forward with respect to the rod portion 56 and is released from the seal ring 58, so that the seal by the backflow prevention device 62 is released. Is done. In addition, when the check ring 57 is moved backward with respect to the rod portion 56 and brought into contact with the seal ring 58 as the screw 20 is advanced during the injection process, the sealing by the backflow prevention device 62 is performed. Is done.

  A resin supply port 65 as a molding material supply port is formed at a predetermined position near the rear end of the heating cylinder 17, and the resin supply port 65 places the screw 20 at a forward limit position in the heating cylinder 17. In this state, it is formed at a location facing the rear end of the groove 67. Then, a charging part 81 as a molding material supply device for charging the resin is attached to and connected to the resin supply port 65, and a molding material that contains pellet-like resin at the upper end of the charging part 81 A hopper 82 as a housing portion is attached. The resin accommodated in the hopper 82 is sent to the resin supply port 65 through the charging portion 81 and is supplied into the heating cylinder 17 from the resin supply port 65.

  The insertion portion 81 includes a cylinder portion 83 that extends in the horizontal direction, a cylindrical guide portion 84 that extends downward from the front end of the cylinder portion 83, and the cylinder portion 83. A feed screw 85 as a supply member that is rotatably arranged in FIG. 1, a feed motor 86 as a supply drive unit for rotating the feed screw 85, and a heater as a heating member provided on the outer periphery of the cylinder portion 83 The cylinder portion 83 is connected to the hopper 82 at the rear end and communicated with the guide portion 84 at the front end.

  Accordingly, when the feed motor 86 is driven to rotate the feed screw 85, the resin in the hopper 82 is supplied into the cylinder portion 83 and advanced along a groove formed on the outer peripheral surface of the feed screw 85. In the meantime, it is heated and preheated by the heater h 21, sent from the front end of the feed screw 85 into the guide portion 84, falls in the guide portion 84, and is supplied into the heating cylinder 17.

  An annular cooling jacket 88 as a cooling device is disposed in the vicinity of the resin supply port 65 so as to surround the lower ends of the heating cylinder 17, the resin supply port 65 and the guide portion 84. Water as a cooling medium is supplied. Therefore, the resin is prevented from falling in the guide portion 84 by the water and melting the resin supplied to the heating cylinder 17 through the resin supply port 65.

  When the screw 20 is placed at the forward limit position, the supply portion is mainly in the region corresponding to the cooling jacket 88 and the heater h13, the melting portion is mainly in the region corresponding to the heater h12, and the heater is mainly used. A measuring section is formed in a region corresponding to h11, and the resin supplied to the supply section is melted without being pressurized in the melting section and kneaded in the measuring section. Therefore, in the flight part 45, the flight 53 is formed at a constant flight pitch in the entire area of the flight part 45, that is, from the front end to the rear end, and the flight mountain diameter, which is the outer diameter of the flight 53. And the flight valley diameter which is the outer diameter of the main-body part 45a is made constant, and the groove | channel 67 is formed with fixed depth.

  In the present embodiment, the pressure member 54 is arranged at the front end of the screw main body 52, but the flight portion is formed over the entire screw main body 52 without arranging the pressure member 54. be able to. In that case, the screw includes a supply unit in a region corresponding to the cooling jacket 88 and the heater h13 when placed in the forward limit position, a compression unit in a region corresponding to the heater h12, and a measuring unit in a region corresponding to the heater h11. The resin supplied to the supply unit is melted while being compressed by the compression unit, and is kneaded by the measurement unit. Therefore, in the flight part, the flight valley diameter is not made constant, and gradually increases from the front end of the supply part to the rear end of the measuring part, and the groove is gradually shallowened.

  Next, the drive device 101 will be described.

  As shown in FIG. 3, the rear end of the heating cylinder 17 is attached to a front injection support 118 as a front support portion, and a rear injection as a rear support portion is provided at a predetermined distance from the front injection support 118. A support 119 is provided. A connecting rod 121 as a connecting member is installed between the front injection support 118 and the rear injection support 119, and a predetermined distance is provided between the front injection support 118 and the rear injection support 119 by the connection rod 121. Retained. The front injection support 118, the rear injection support 119, and the connecting rod 121 constitute an injection frame.

  A connecting body 164 having a circular shape is integrally attached to the rear end of the shaft portion 51 of the screw 20 via a coupler 159, and a cylindrical support body 165 is attached to the connecting body 164. The connecting body 164 and the support body 165 constitute a rotary sliding member 168 that rotates integrally with the screw 20. The support 165 has a length corresponding to the stroke of the screw 20 in the axial direction, and a male spline 167 is formed on the outer peripheral surface.

  Adjacent to the rear end of the front injection support 118, a metering motor 122 as a metering drive unit is provided integrally with the front injection support 118 and surrounding the rotary sliding member 168, The metering motor 122 is placed in the first driving state in the metering step and in the second driving state in the injection step, and rotates the rotary sliding member 168 in the first driving state, so that the second driving state. The rotation transmitted to the rotary sliding member 168 is restrained.

  The metering motor 122 includes a stator 125 attached to the front injection support 118, and a cylindrical rotor 126 disposed radially inward of the stator 125, and a spline at the rear end of the rotor 126. A nut 127 is attached.

  The spline nut 127 transmits the rotation generated in the first driving state of the weighing motor 122 to the rotary sliding member 168, rotates the rotary sliding member 168, and the second of the weighing motor 122 is rotated. The restraining force generated in the driving state is transmitted to the rotary sliding member 168 to restrain the rotary sliding member 168 from rotating. Therefore, the rotary sliding member 168 is disposed so as to be movable in the axial direction with respect to the rotor 126, and the outer peripheral surface of the connecting body 164 and the inner peripheral surface of the rotor 126 are sealed at the front end of the connecting body 164. The female spline formed on the inner peripheral surface of the spline nut 127 and the male spline 167 are spline-engaged at the rear end of the support 165.

  A ball screw 183 including a ball screw shaft 181 and a ball nut 182 that are screwed together is disposed behind the front injection support 118. The ball screw 183 constitutes a movement direction conversion portion, the ball screw shaft 181 constitutes a first conversion element, and the ball nut 182 constitutes a second conversion element. The ball screw 183 converts the rotational rotational motion transmitted to the ball screw shaft 181 into a linear motion that the ball screw shaft 181 rotates, that is, a rotational linear motion.

  The ball screw shaft 181 connects a small-diameter shaft portion 184, a large-diameter screw portion 185, and an injection motor 123 as an injection driving portion, which are sequentially formed from the front end to the rear end, and the ball screw shaft 181. It is composed of a spline (not shown) as a connecting portion for supporting at the front end by a bearing br1, br2 as a support member so as to be rotatable with respect to the rotary sliding member 168 and immovable in the axial direction, The ball nut 182 is rotatably screwed and supported. The ball nut 182 is fixed to the rear injection support 119 via a load cell 196 as a load detection unit and an axial force detection unit. The load cell 196 includes an outer element 201 as a first element and an inner element 202 as a second element. The outer element 201 is sandwiched between a rear injection support 119 and an injection motor 123, and The element 202 is fixed to the flange portion f1 of the ball nut 182.

  Next, the operation of the injection apparatus 31 having the above configuration will be described.

  First, during the weighing process, the weighing motor 122 is placed in the first driving state and driven in the forward direction, and when the feed motor 86 is driven in the forward direction, the feed screw 85 and the screw 20 are rotated in the forward direction. It is done. At this time, the resin supplied from the hopper 82 into the cylinder portion 83 is advanced along the groove of the feed screw 85, and is preheated in the meantime, and supplied from the front end of the cylinder portion 83 into the guide portion 84. Then, it is supplied into the heating cylinder 17 through the resin supply port 65. In the cylinder portion 83, the resin is preheated to a temperature at which it does not melt, for example, a predetermined temperature below the glass transition point.

  The resin supplied into the heating cylinder 17 is advanced along the groove 67 and is heated and melted by the heaters h11 to h13. Note that the pressure of the resin gradually increases as the resin is advanced from the pressure rise start point just before the pressure member 54 to the front end of the screw main body 52 by a predetermined distance.

  Subsequently, the resin passes through the resin flow path between the heating cylinder 17 and the pressure member 54, and the pressure is further increased, and after being sufficiently kneaded, the resin between the heating cylinder 17 and the rod portion 56. It is advanced through the resin flow path between them and sent to the front of the screw head. In addition, in order to apply a back pressure to the screw 20 during the measuring step, the injection motor 123 is driven to suppress the backward movement of the screw 20.

  Further, when the injection motor 123 is driven during the injection process, the rotation generated by the injection motor 123 is transmitted to the ball screw shaft 181, and the rotational motion is converted into a rotationally linear motion by the ball screw 183. As a result, the ball screw shaft 181 is advanced while rotating. At this time, the metering motor 122 is placed in the second driving state, the rotational speed of the rotor 126 is controlled to 0 [rpm], and a restraining force is generated. The restraining force is transmitted to the rotary sliding member 168 via the spline nut 127, and the rotation transmitted to the rotary sliding member 168 via the ball screw shaft 181 is restrained. As a result, the screw 20 integrally attached to the rotary sliding member 168 is advanced without rotating.

  Thus, when the screw 20 is advanced, the resin sent to the front of the screw head is injected from the injection nozzle 18 and filled in the cavity space of the mold apparatus.

  The load cell 196 detects the force applied to the screw 20 by the pressure of the resin during the metering process (generated backward), that is, the axial force, and the force that advances the screw 20 during the injection process, that is, Detect the shooting power. The axial force takes the same value as the back pressure when a back pressure is applied to the screw 20.

  Next, the control unit of the injection molding machine configured as described above will be described.

  FIG. 1 is a diagram showing a control unit of an injection molding machine according to the first embodiment of the present invention.

  In the injection molding machine, the control unit controls the injection molding machine to drive the feed motor 86, the metering motor 122, the injection motor 123, etc., and to energize the heaters h11 to h13, h21. 100 is disposed. The control unit 100 includes a CPU (not shown) as a calculation device, a memory (not shown) as a recording device, and a display unit 105, an operation unit 106, and the like, and performs various calculations according to a predetermined program, data, and the like. , Function as a computer.

  Further, the temperature sensor so, si, the load cell 196, and encoders 107 to 109 as a rotation speed detection unit and as a rotation position detection unit are connected to the control unit 100. The encoders 107 to 109 are disposed in a feed motor 86, a metering motor 122, and an injection motor 123, respectively. The rotation speeds and rotation positions (magnetic poles) of the feed motor 86, the metering motor 122, and the injection motor 123 are provided. Position).

  By the way, if the resin supplied from the hopper 82 is accumulated in the supply unit located in the vicinity of the resin supply port 65 and an excessive state of resin is formed in the supply unit, shear heat is generated in the resin. Is carbonized, and the carbonized resin is mixed as impurities into the molded product.

  In addition, when an excessive resin state is formed, not only the frictional resistance between the inner peripheral surface of the heating cylinder 17 and the resin increases in the measuring step, but also the frictional resistance fluctuates. Therefore, a sufficient amount of resin cannot be measured, and the amount of resin to be measured varies, and the quality of the molded product is deteriorated.

  Therefore, in the supply unit, the amount of resin supplied from the hopper 82 to the heating cylinder 17 is reduced to perform starvation weighing, and the supply unit prevents the resin from forming an excessive state and forms a starvation state. I am doing so.

  Therefore, when performing starvation weighing, the amount of resin weighed from the diameter of the screw 20, the amount of resin supplied from the hopper 82 to the heating cylinder 17 and the like are calculated, and a starvation state is formed based on the calculation result. In the initial setting for starting the operation of the injection device 31, it is necessary for the operator to form a starvation state based on experience while monitoring the quality of the molded product, so that an appropriate starvation state is formed. It becomes difficult and the work becomes complicated.

  Therefore, the control unit 100 keeps the rotational speed of one of the screw 20 and the feed motor 86, in the present embodiment, the rotational speed of the screw 20 constant, and the other rotational speed, in the present embodiment, When the operation of the injection device 31 is started by changing the rotation speed of the feed motor 86, initial setting for forming a starvation state of the resin is performed in the supply unit, and heating when the feed screw 85 is rotated An amount of resin supplied to the cylinder 17, that is, an initial supply amount representing an initial value of the supply amount (supply resin amount) is calculated. In this case, the supply amount constitutes a predetermined variable for setting the state of the resin formed in the supply unit, that is, a control variable, and the initial supply amount constitutes an initial set value of the control variable, Represents molding conditions.

  FIG. 4 is a flowchart showing the operation of the control unit in the first embodiment of the present invention, FIG. 5 is a diagram showing the characteristics of the resin in the first embodiment of the present invention, and FIG. 6 is the first flowchart of the present invention. It is a time chart which shows operation | movement of the control part in embodiment. In FIG. 5, the horizontal axis represents time and the vertical axis represents axial force.

  First, in a state where the injection nozzle 18 is opened (a state where the nozzle is not touched), a main rotational speed control processing unit (main rotational speed control processing unit) (not shown) of the control unit 100 performs a main rotational speed control process. Then, the metering motor 122 is driven in the forward direction, and the screw 20 is rotated at a set value (a constant rotation speed) based on the rotation speed and the set value detected by the encoder 108 to perform weighing. In this case, the temperature of the heating cylinder 17 is set as necessary. At this time, since the feed motor 86 is not driven, the resin is not actually supplied into the heating cylinder 17.

  Subsequently, a position holding processing means (position holding processing unit) (not shown) of the control unit 100 performs a position holding process, drives the injection motor 123 based on the rotational position of the injection motor 123, and sets the screw 20 to a predetermined value. This position is held at the forward limit position in the present embodiment. Since the rotation position of the injection motor 123 is proportional to the position of the screw 20, the position of the screw 20 can be detected by detecting the rotation position.

  Next, a sub rotation speed control processing unit (sub rotation speed control processing section) (not shown) of the control unit 100 performs sub rotation speed control processing, drives the feed motor 86 in the forward direction, and drives the feed screw 85 in the forward direction. When the process of calculating the initial supply amount is started, the supply of the resin under the initial conditions, in this embodiment, the supply of the resin is started at the supply start calculation start value.

  In this case, the calculation start value is set to about 1/5 of the amount of resin discharged from the injection nozzle 18 by rotating the screw 20 at the set value, that is, the discharge amount (measured resin amount). The smaller the calculation start value, the better.

  Then, when the resin is supplied to the heating cylinder 17, the resin is melted in the heating cylinder 17, and sent to the front of the screw head, the screw 20 receives the pressure of the resin and tries to retreat. In that case, as described above, the position holding processing means drives the injection motor 123 to hold the screw 20 at the forward limit position, and therefore the axial force (takes the same value as the back pressure) by the load cell 196. Can be detected.

  By the way, when the axial force when the resin is supplied to the heating cylinder 17 by the hopper 82 is monitored, as shown in FIG. 5, when the resin forms a starved state in the supply unit, the axial force is the pattern Q1. When the resin forms an excessive state in the supply section as shown by, the axial force largely fluctuates in the high area as shown by the pattern Q2.

  Therefore, by monitoring the axial force, it can be determined whether the resin forms a starvation state or an excessive state in the supply unit. In the present embodiment, the monitoring variable is configured by the axial force, and the monitoring variable detection unit is configured by the load cell 196.

  In addition, as shown in FIG. 6, as the resin supply by the hopper 82 is started, the axial force gradually increases, and when the resin supply amount is small, the steady state is obtained in the region AR1 where the axial force is small. When the starvation state is formed and the amount of resin supplied is large, the steady state occurs in the area AR2 where the axial force is large, and an excessive state is formed.

  Therefore, an unillustrated axial force determination processing unit (axial force determination processing unit) as a monitoring variable determination processing unit (monitoring variable determination processing unit) of the control unit 100 performs an axial force determination process as a monitoring variable determination process, The axial force detected by the load cell 196 is read, and it waits for the axial force to reach a steady state. In this case, whether or not the axial force has reached a steady state can be determined, for example, based on whether or not the difference between the minimum value and the maximum value of the axial force within a predetermined time is within a set range. That is, the axial force determination processing means determines that the axial force has reached a steady state when the difference between the minimum value and the maximum value of the axial force is within the set range, and determines the difference between the minimum value and the maximum value of the axial force. If the difference does not fall within the set range, it is determined that the axial force is not in a steady state.

  When the axial force reaches a steady state, a state determination processing unit (state determination processing unit) (not illustrated) of the control unit 100 performs a state determination process, and the resin forms a starvation state or an excessive state. Determine whether you are doing. In this case, whether the resin forms a starvation state or an excessive state depends on whether, for example, the sum of the absolute values of the differential values of the axial force within a predetermined time is within a predetermined range. Judgment can be made. That is, the state determination processing unit determines that the resin forms a starvation state when the total absolute value of the differential value of the axial force falls within a predetermined range, and determines the absolute value of the differential value of the axial force. If the total does not fall within the predetermined range, it is determined that the resin forms an excessive state.

  An initial setting value setting processing unit (initial setting value setting processing unit) (not shown) of the control unit 100 performs an initial setting value setting process, and supplies based on the state of the resin determined by the state determination processing unit. Change the amount and calculate and set the initial supply. For this purpose, the variable change processing means (variable change processing section) of the initial set value setting processing means performs variable change processing, and if it is determined that the resin is in an excessive state, the supply amount is reduced. When it is determined that the resin forms a starvation state, the supply amount is increased. In this case, the initial supply amount is set to the calculation start value.

When the resin forms a starvation state, the variable change processing means increases the supply amount by multiplying the calculated supply amount at that time by a coefficient α for increase larger than 1. The supply amount before multiplication by the coefficient α is set as a lower limit value as a lower threshold value. Then, even when a newly calculated supply amount of resin is supplied, if the resin is in a starved state, the supply amount is increased by multiplication by the coefficient α each time, and the lower limit value is updated. On the other hand, when the resin is in an excessive state, the variable change processing means reduces the supply amount by multiplying the calculated supply amount at that time by a reduction coefficient β having a value smaller than 1. Then, the supply amount before multiplication by the coefficient β is set as an upper limit value as an upper threshold value. Then, even when a newly calculated supply amount of resin is supplied, if the resin is in an excessive state, the supply amount is reduced by multiplication by the coefficient β each time, and the upper limit value is updated. The coefficient α is
1 <α <2
And the coefficient β is
0 <β <1
Range of values, and
α <1 / β
And

  Subsequently, a convergence determination processing unit (convergence determination processing unit) of the initial set value setting processing unit performs a convergence determination process to determine whether or not the supply amount has converged under a predetermined convergence condition. The convergence condition is satisfied when the supply amount is increased in the variable change process, when the supply amount becomes smaller than the set lower limit value, and the supply amount is decreased in the variable change process. In this case, it is established when the supply amount exceeds the set upper limit value each time.

  For example, as a result of increasing the supply amount by multiplying by the coefficient α, the resin forms an excessive state, and accordingly, when the supply amount is decreased by performing the multiplication by the coefficient β to reduce the supply amount, The convergence condition is satisfied when the number becomes smaller. At this time, the convergence determination processing means sets the lower limit value as a reference value for calculating the initial supply amount.

  In addition, as a result of reducing the supply amount by multiplying by the coefficient β, the resin forms a starvation state, and accordingly, when the supply amount is increased by performing the multiplication by the coefficient α, the supply amount becomes the upper limit value. It is established when the number becomes larger. At this time, the convergence determination processing means sets the upper limit value as a reference value for calculating the initial supply amount.

  In this way, when the supply amount is increased, the supply amount immediately before the transition from the starvation state to the excessive state is reduced. When the supply amount is decreased, the supply amount immediately before the transition from the excessive state to the starvation state is performed. And the reference value. That is, the supply amount when the resin shifts from the starved state to the excessive state or from the excessive state to the starved state is set as the reference value.

  In this embodiment, it is set so that the convergence condition is satisfied when the supply amount becomes smaller than the lower limit value or when the supply amount becomes larger than the upper limit value, but the value when the supply amount is reduced. When the difference between the value and the lower limit falls within the preset range, or the difference between the value when the supply amount increases and the upper limit falls within the preset range, the convergence condition is It can be set to hold.

Subsequently, when the convergence condition is satisfied, the initial setting value calculation processing means (initial setting value calculation processing section) of the initial setting value setting processing means performs the initial setting value calculation processing and sets the safety factor γ to the reference value.
0 <γ <1
To calculate and set the initial supply amount. Therefore, since the resin is supplied at an initial supply amount smaller than the reference value, it is possible to reliably prevent an excessive state from being formed.

  Thus, in the present embodiment, by changing the resin supply amount based on the axial force pattern, an excessive state may not be formed, and a state in which the supply amount and the discharge amount are balanced may be formed. A possible initial supply amount can be calculated. Therefore, an appropriate starvation state can be easily formed in the heating cylinder 17 in the initial setting. In addition, in the initial setting, it is not necessary for the operator to form a starvation state based on experience while monitoring the quality of the molded product, so that the operation for forming the starvation state can be simplified.

Next, a flowchart will be described.
Step S1: The screw 20 is held at the forward limit position.
Step S2: Resin supply according to initial conditions is started.
Step S3 The system waits for the axial force to reach a steady state, and proceeds to step S4 when the axial force reaches a steady state.
Step S4: State determination processing is performed.
Step S5: It is determined whether an excessive state is formed. If the excessive state is formed, the process proceeds to step S6. If not, the process proceeds to step S7.
Step S6: Reduce the supply amount.
Step S7: Increase the supply amount.
Step S8: Determine whether the supply amount has converged. If the supply amount has converged, the process proceeds to step S9, and if not, the process returns to step S3.
Step S9: The initial supply amount is calculated, and the process ends.

  By the way, when the temperature in the vicinity of the supply part when the resin is supplied to the heating cylinder 17 by the hopper 82 is monitored, if the resin forms a starvation state in the supply part, the temperature is stabilized in a predetermined region. On the other hand, when the resin forms an excessive state in the supply unit, the temperature fluctuates in a low region.

  Therefore, a second embodiment of the present invention will be described in which a starvation state of the resin in the supply unit is formed by monitoring the temperature in the initial setting. 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. 7 is a flowchart showing the operation of the control unit in the second embodiment of the present invention.

  First, in a state in which the injection nozzle 18 as a nozzle member is opened, the main rotational speed control processing means drives a metering motor 122 as a metering drive unit in the forward direction, and the injection member detected by the encoder 108. Based on the rotational speed and set value of the screw 20 as the measuring member, the screw 20 is rotated at the set value to perform measurement.

  Subsequently, the position holding processing means drives the injection motor 123 based on the rotational position of the injection motor 123 as an injection drive unit, and moves the screw 20 to a predetermined position, in this embodiment, the forward movement. Hold in the limit position.

  Next, the sub rotational speed control processing means drives the feed motor 86 as a supply drive unit in the forward direction and rotates the feed screw 85 as a supply member in the forward direction to calculate the initial supply amount. In starting the processing, the supply of the resin as the molding material is started at the calculation start value.

  By the way, one of the two temperature sensors so and si as the temperature detection unit, in the present embodiment, the temperature sensor si monitors the temperature of the heating cylinder 17 as a cylinder member, thereby providing resin in the supply unit. Try to determine if a starvation has been formed. In the present embodiment, the monitoring variable is configured by the temperature, and the monitoring variable detection unit is configured by the temperature sensors so and si.

  Therefore, when the temperature in the vicinity of the supply unit when the resin is supplied to the heating cylinder 17 by the hopper 82 as the molding material storage unit, when the resin forms a starvation state in the supply unit, the temperature is When the resin is in an excessive state in the supply unit, the temperature fluctuates in a low region while it is stable in a predetermined region.

  Therefore, by monitoring the temperature, it can be determined whether the resin forms a starvation state or an excess state in the supply section.

  In addition, when the heaters h11 to h13 as heating members are turned on and the supply of resin by the hopper 82 is started, the temperature of the heating cylinder 17 gradually increases, but when the supply amount of resin is small, When the temperature becomes a steady state in a predetermined height region, a starvation state is formed, and when the amount of resin supplied is large, the temperature becomes a steady state in a low region and an excessive state is formed.

  Therefore, a temperature determination processing unit (temperature determination processing unit) (not shown) serving as a monitoring variable determination processing unit of the control unit 100 performs a temperature determination process as a monitoring variable determination process, and reads the temperature detected by the temperature sensor si. Wait for the temperature to reach steady state. In this case, whether or not the temperature has reached a steady state can be determined, for example, based on whether or not the difference between the minimum value and the maximum value of the temperature within a predetermined time is within the set range. That is, the temperature determination processing unit determines that the temperature is in a steady state when the difference between the minimum value and the maximum value of the temperature falls within the set range, and the difference between the minimum value and the maximum value of the temperature is within the set range. If the temperature does not fall within the range, it is determined that the temperature is not in a steady state.

  When the temperature reaches a steady state, the state determination processing unit determines whether the resin forms a starvation state or an excessive state. In this case, whether the resin forms a starvation state or an excessive state, for example, whether the temperature is within a predetermined range and the sum of absolute values of the differential value of the temperature within a predetermined time. Can be determined by whether or not is within a predetermined range. That is, when the temperature falls within a predetermined range and the sum of absolute values of the differential values of the temperature falls within the predetermined range, the state determination processing unit determines that the resin forms a starvation state, When the temperature is lower than the predetermined range and the sum of absolute values of the differential values of the temperature does not fall within the predetermined range, it is determined that the resin is in an excessive state.

  Then, the initial set value setting processing means changes the supply amount based on the state of the resin determined by the state determination processing means, and calculates and sets the initial supply amount. Therefore, when it is determined that the resin is forming an excessive state, the variable change processing means decreases the supply amount, and when it is determined that the resin forms a starvation state, the supply amount To increase.

  When the resin forms a starvation state, the variable change processing means increases the supply amount by multiplying the calculated supply amount at that time by a coefficient α for increase larger than 1. The supply amount before multiplication by the coefficient α is set as a lower limit value as a lower threshold value. Then, even when a newly calculated supply amount of resin is supplied, if the resin is in a starved state, the supply amount is increased by multiplication by the coefficient α each time, and the lower limit value is updated. On the other hand, when the resin is in an excessive state, the variable change processing means reduces the supply amount by multiplying the calculated supply amount at that time by a reduction coefficient β having a value smaller than 1. Then, the supply amount before multiplication by the coefficient β is set as an upper limit value as an upper threshold value. Then, even when a newly calculated supply amount of resin is supplied, if the resin is in an excessive state, the supply amount is reduced by multiplication by the coefficient β each time, and the upper limit value is updated. The coefficients α and β have the same values as in the first embodiment.

  Subsequently, the convergence determination processing means determines whether or not the supply amount has converged under a predetermined convergence condition. Whether or not the convergence condition is satisfied is determined based on the supply amount, the lower limit value, and the upper limit value in the variable change processing, as in the first embodiment.

  In this way, when the supply amount is increased, the supply amount immediately before the transition from the starvation state to the excessive state is reduced. When the supply amount is decreased, the supply amount immediately before the transition from the excessive state to the starvation state is performed. And the reference value. That is, the supply amount when the resin shifts from the starved state to the excessive state or from the excessive state to the starved state is set as the reference value.

  Next, when the convergence condition is satisfied, the initial set value calculation processing unit multiplies the reference value by the safety factor γ, as in the first embodiment, and calculates and sets the initial supply amount. Therefore, since the resin is supplied at an initial supply amount smaller than the reference value, it is possible to reliably prevent an excessive state from being formed.

  Thus, in the present embodiment, by changing the resin supply amount based on the temperature pattern, an excessive state is not formed, and a state in which the supply amount and the discharge amount are balanced can be formed. An initial supply amount can be calculated. Therefore, an appropriate starvation state can be easily formed in the heating cylinder 17 in the initial setting. In addition, in the initial setting, it is not necessary for the operator to form a starvation state based on experience while monitoring the quality of the molded product, so that the operation for forming the starvation state can be simplified.

Next, a flowchart will be described.
Step S11 The screw 20 is held at the forward limit position.
Step S12: Resin supply according to initial conditions is started.
Step S13 The system waits for the temperature to reach a steady state, and proceeds to step S14 when the temperature reaches a steady state.
Step S14: State determination processing is performed.
Step S15: It is determined whether an excessive state is formed. If the excessive state is formed, the process proceeds to step S16, and if not, the process proceeds to step S17.
Step S16: Reduce the supply amount.
Step S17: Increase the supply amount.
Step S18: Determine whether the supply amount has converged. If the supply amount has converged, the process proceeds to step S19, and if not, the process returns to step S13.
Step S19: The initial supply amount is calculated, and the process ends.

  By the way, when the flow of heat from the heaters h11 to h13 in the vicinity of the supply unit when the resin is supplied to the heating cylinder 17 by the hopper 82, that is, the heat flux is monitored, the resin is starved in the supply unit. When formed, the temperature stabilizes in a predetermined region, whereas when the resin forms an excessive state in the supply unit, the temperature fluctuates in a low region.

  Therefore, in the initial setting, a third embodiment of the present invention in which the starvation state of the resin in the supply unit is formed by monitoring the heat flux will be described. In addition, about the thing which has the same structure as 1st, 2nd embodiment, the same code | symbol is provided and the effect of the embodiment is used about the effect of the invention by having the same structure.

  FIG. 8 is a flowchart showing the operation of the control unit in the third embodiment of the present invention.

  First, in a state in which the injection nozzle 18 as a nozzle member is opened, the main rotational speed control processing means drives a metering motor 122 as a metering drive unit in the forward direction, and the injection member detected by the encoder 108. Based on the rotational speed and set value of the screw 20 as the measuring member, the screw 20 is rotated at the set value to perform measurement.

  Subsequently, the position holding processing means drives the injection motor 123 based on the rotational position of the injection motor 123 as an injection drive unit, and moves the screw 20 to a predetermined position, in this embodiment, the forward movement. Hold in the limit position.

  Next, the sub rotational speed control processing means drives the feed motor 86 as a supply drive unit in the forward direction and rotates the feed screw 85 as a supply member in the forward direction to calculate the initial supply amount. In starting the processing, the supply of the resin as the molding material is started at the calculation start value of the supply amount.

  By the way, when the temperature of the heating cylinder 17 as the heating member is detected by the two temperature sensors so and si as the temperature detection unit and the detected temperature, that is, the detected temperature is compared, the temperature sensor so Since the temperature sensor si is disposed in the vicinity of the inner peripheral surface of the heating cylinder 17, the detected temperature varies depending on the state of the resin in the heating cylinder 17. The heat flux can be calculated and monitored based on each detected temperature.

  Therefore, in the present embodiment, it is determined whether or not a starvation state of the resin in the supply unit is formed by monitoring the heat flux. In the present embodiment, the monitoring variable is configured by the heat flux, and the monitoring variable detection unit is configured by the temperature sensors so and si.

  Therefore, when the heat flux in the vicinity of the supply portion when the resin is supplied to the heating cylinder 17 by the hopper 82 as the molding material accommodating portion, if the resin forms a starvation state in the supply portion, While the bundle is stable in a predetermined region, when the resin forms an excessive state in the supply unit, the resin takes heat away, so that the heat flux fluctuates in a low region.

  Therefore, by monitoring the heat flux, it can be determined whether the resin forms a starvation state or an excess state in the supply section.

  Further, as the heaters h11 to h13 as heating members are turned on and the supply of resin by the hopper 82 is started, the heat flux gradually increases, but when the amount of resin supply is small, the heat flux is When the predetermined height region is in a steady state, a starvation state is formed, and when the amount of resin supplied is large, the heat flux becomes a steady state in a low region, and an excessive state is formed.

  Therefore, a heat flux determination processing unit (heat flux determination processing unit) (not shown) as a monitoring variable determination processing unit of the control unit 100 performs a heat flux determination process as a monitoring variable determination process, and is detected by the temperature sensors so and si. The obtained temperature is read, the heat flux is calculated based on the detected temperature, and the system waits for the heat flux to reach a steady state. In this case, whether or not the heat flux has reached a steady state can be determined, for example, based on whether or not the difference between the minimum value and the maximum value of the heat flux within a predetermined time is within a set range. That is, the heat flux determination processing means determines that the heat flux has reached a steady state when the difference between the minimum value and the maximum value of the heat flux falls within the set range, and the difference between the minimum value and the maximum value of the heat flux. Is not within the set range, it is determined that the heat flux is not in a steady state.

  When the heat flux reaches a steady state, the state determination processing unit determines whether the resin forms a starvation state or an excessive state. In this case, whether the resin forms a starvation state or an excess state, for example, whether the heat flux is within a predetermined range and the absolute value of the differential value of the heat flux within a predetermined time. Can be determined by whether or not the sum of the values falls within a predetermined range. That is, the state determination processing unit determines that a starvation state is formed when the heat flux falls within a predetermined range, and the sum of absolute values of the differential values of the heat flux falls within a predetermined range, When the heat flux is lower than the predetermined range and the sum of the absolute values of the differential values of the heat flux does not fall within the predetermined range, it is determined that an excessive state is formed.

  The variable change processing means reduces the supply amount when it is determined that the resin forms an excessive state, and reduces the supply amount when it is determined that the resin forms a starvation state. Do more.

  When the resin forms a starvation state, the variable change processing means increases the supply amount by multiplying the calculated supply amount at that time by a coefficient α for increase larger than 1. The supply amount before multiplication by the coefficient α is set as a lower limit value as a lower threshold value. Then, even when a newly calculated supply amount of resin is supplied, if the resin is in a starved state, the supply amount is increased by multiplication by the coefficient α each time, and the lower limit value is updated. On the other hand, when the resin is in an excessive state, the variable change processing means reduces the supply amount by multiplying the calculated supply amount at that time by a reduction coefficient β having a value smaller than 1. Then, the supply amount before multiplication by the coefficient β is set as an upper limit value as an upper threshold value. Then, even when a newly calculated supply amount of resin is supplied, if the resin is in an excessive state, the supply amount is reduced by multiplication by the coefficient β each time, and the upper limit value is updated. The coefficients α and β have the same values as in the first embodiment.

  Subsequently, the convergence determination processing means determines whether or not the supply amount has converged under a predetermined convergence condition. Whether or not the convergence condition is satisfied is determined based on the supply amount, the lower limit value, and the upper limit value in the variable change processing, as in the first embodiment.

  In this way, when the supply amount is increased, the supply amount immediately before the transition from the starvation state to the excessive state is reduced. When the supply amount is decreased, the supply amount immediately before the transition from the excessive state to the starvation state is performed. And the reference value. That is, the supply amount when the resin shifts from the starved state to the excessive state or from the excessive state to the starved state is set as the reference value.

  Subsequently, when the convergence condition is satisfied, the initial set value calculation processing means multiplies the reference value by the safety factor γ as in the first embodiment, and calculates and sets the initial supply amount. Therefore, since the resin is supplied at an initial supply amount smaller than the reference value, it is possible to reliably prevent an excessive state from being formed.

  As described above, in the present embodiment, by changing the resin supply amount based on the heat flux pattern, an excessive state may not be formed, and a state in which the supply amount and the discharge amount are balanced may be formed. A possible initial supply amount can be calculated. Therefore, an appropriate starvation state can be easily formed in the heating cylinder 17 in the initial setting. In addition, in the initial setting, it is not necessary for the operator to form a starvation state based on experience while monitoring the quality of the molded product, so that the operation for forming the starvation state can be simplified.

Next, a flowchart will be described.
Step S21 The screw 20 is held at the forward limit position.
Step S22: Resin supply according to initial conditions is started.
Step S23 The process waits for the heat flux to reach a steady state. If the heat flux has reached a steady state, the process proceeds to Step S24.
Step S24: A state determination process is performed.
Step S25: It is determined whether an excessive state is formed. If the excessive state is formed, the process proceeds to step S26, and if not, the process proceeds to step S27.
Step S26: Reduce the supply amount.
Step S27: Increase the supply amount.
Step S28: Determine whether the supply amount has converged. If the supply amount has converged, the process proceeds to step S29, and if not, the process returns to step S23.
Step S29: The initial supply amount is calculated, and the process ends.

  In each of the embodiments, the control unit 100 calculates the initial supply amount of the supply amount by changing the rotation speed of the feed motor 86 while keeping the rotation speed of the screw 20 constant. When the operation of the injection device 31 is started by making the rotation speed of the feed motor 86 constant and changing the rotation speed of the screw 20, initial setting for forming a starvation state of the resin in the supply unit is performed. The initial discharge amount of the discharge amount from the injection nozzle 18 can be calculated by rotating the screw 20. In this case, the discharge amount constitutes a predetermined variable for setting the state of the resin formed in the supply unit, that is, a control variable, and the initial discharge amount constitutes an initial set value of the control variable. And represents the molding conditions.

  First, the main rotational speed control processing means drives the metering motor 122 in the forward direction, rotates the screw 20, performs weighing, and starts the process of calculating the initial set amount according to the initial conditions. Resin discharge is started at the resin discharge, that is, the discharge start calculation value.

  Subsequently, the position holding processing means drives the injection motor 123 based on the rotational position of the injection motor 123, and holds the screw 20 at a predetermined position, in this embodiment, the forward limit position.

  Next, the auxiliary rotational speed control processing means drives the feed motor 86 in the forward direction, and sets the feed screw 85 to a set value (a constant value) based on the rotational speed and set value of the feed screw 85 detected by the encoder 107. The resin is fed at a rotational speed.

  In this state, when monitoring the axial force when the resin is discharged by the screw 20, the temperature in the vicinity of the supply unit, the heat flux representing the flow of heat from the heaters h11 to h13 in the vicinity of the supply unit, and the like, It can be determined whether the resin forms a starved state or an excessive state in the supply unit.

  Therefore, based on the axial force detected by the load cell 196, the temperature in the vicinity of the supply unit, the heat flux representing the flow of heat from the heaters h11 to h13 in the vicinity of the supply unit, the axial force, temperature, and heat flux It becomes possible to determine whether the resin has formed a starvation state or an excessive state in the supply unit.

  When it is determined that the resin is in an excessive state, the discharge amount is increased. When it is determined that the resin is in a starvation state, the discharge amount is decreased and the discharge amount is predetermined. It is determined whether or not it has converged under the convergence condition. When the convergence condition is satisfied, the reference value is multiplied by the safety factor, and the initial set amount is calculated.

  In each of the above embodiments, the case where the initial supply amount or the initial discharge amount is set in the initial setting for starting the operation of the injection device 31 has been described. It can also be applied to the case where the initial supply amount or the initial discharge amount is set again so that the supply amount or discharge amount of the resin becomes an optimum value during the measuring step.

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

It is a figure which shows the control part of the injection molding machine in the 1st Embodiment of this invention. It is a 1st figure which shows the injection apparatus in the 1st Embodiment of this invention. It is a 2nd figure which shows the injection apparatus in the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the control part in the 1st Embodiment of this invention. It is a figure which shows the characteristic of resin in the 1st Embodiment of this invention. It is a time chart which shows operation | movement of the control part in the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the control part in the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the control part in the 3rd Embodiment of this invention.

Explanation of symbols

17 Heating cylinder 20 Screw 31 Injection device 65 Resin supply port 81 Input part 86 Feed motor 122 Weighing motor 123 Injection motor

Claims (8)

(A) a cylinder member;
(B) an injection member disposed rotatably and reciprocally in the cylinder member;
(C) a molding material supply device connected to a molding material supply port formed at a predetermined location of the cylinder member and supplying the molding material into the cylinder member;
(D) a metering drive unit for performing metering by moving the molding material in the cylinder member forward by rotating the injection member;
(E) an injection drive unit for advancing the cylinder member to inject the molding material;
(F) a supply drive unit for supplying a molding material into the cylinder member;
(G) Based on a predetermined monitoring variable when the metering drive unit and the supply drive unit are driven in a state where the position of the injection member in the cylinder member is held, the molding material supply port State determination processing means for determining the state of the molding material in the vicinity;
(H) An injection molding machine comprising: initial setting value setting processing means for changing a predetermined control variable based on the state of the molding material and setting an initial setting value of the control variable.   The injection molding machine according to claim 1, wherein the state determination processing unit drives the metering drive unit and the supply drive unit in a state where the nozzle member is opened.   The injection molding machine according to claim 1, wherein the monitoring variable is an axial force applied to the injection member.   The injection molding machine according to claim 1, wherein the monitoring variable is a temperature in the vicinity of the molding material supply port.   The injection molding machine according to claim 1, wherein the monitoring variable is a heat flux in the vicinity of the molding material supply port.   The state determination processing unit changes the supply amount of the molding material by driving the supply drive unit while keeping the discharge amount of the molding material constant by driving the metering drive unit. The injection molding machine described.   The state determination processing unit changes the discharge amount of the molding material by driving the metering drive unit while keeping the supply amount of the molding material by driving the driving unit for supply constant. The injection molding machine described. Connected to a cylinder member, an injection member disposed so as to be rotatable and movable back and forth in the cylinder member, and a molding material supply port formed at a predetermined position of the cylinder member, and a molding material is placed in the cylinder member. A molding material supply device to supply, a metering drive for advancing the molding material in the cylinder member by rotating the injection member, and a cylinder drive member for advancing the cylinder member to inject the molding material In a molding method of an injection molding machine having a drive unit for injection and a drive unit for supply for supplying a molding material into the cylinder member,
(A) Based on a predetermined monitoring variable when the metering drive unit and the supply drive unit are driven in a state where the position of the injection member in the cylinder member is held, the molding material supply port Judge the state of the molding material in the vicinity,
(B) A molding method for an injection molding machine, wherein a predetermined control variable is changed based on the state of the molding material, and an initial set value of the control variable is set.

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