JP6677957B2 - Injection molding machine plasticizer - Google Patents

Description

The present invention relates to a plasticizing device of an injection molding machine that supplies a reinforcing fiber material and a resin material to a heating cylinder to perform plasticization.

BACKGROUND ART Conventionally, as a plasticizing device of an injection molding machine that supplies a reinforcing fiber material and a resin material to a heating cylinder to perform plasticization, a device described in Patent Literature 1 is known. Direct molding in which a reinforcing fiber material and a resin material are separately supplied to a heating cylinder without using fiber-containing pellets as in Patent Literature 1 makes it possible to reduce material costs. In Patent Literature 1, the feed rate of the fiber material or the resin material is controlled by controlling the rotation speed or the rotation timing of the feed screw.

However, in the technique of Patent Literature 1, the supply weight of the fiber material or the resin material sent by the feed screw is not measured and controlled, so that the fiber material and the resin material are heated at an accurate weight ratio to the heating cylinder of the plasticizer. It could not be supplied inside.

As a solution to the above problem, there is known a device using a weight-type feeder described in Patent Documents 2 and 3. Patent Literature 2 supplies a raw material using a gravimetric feeder so that the supplied raw material has a predetermined weight. However, Patent Document 2 is used for an injection molding machine used for a metal powder material, and does not cover a composite material such as a reinforcing fiber material and a resin material.

On the other hand, Patent Document 3 discloses a method in which a plurality of types of powdery or granular materials described in the form of short fibers or the like are weighed by a weighing machine so as to have a predetermined mass ratio, and the material mixed by a mixing means is injected into an injection molding machine The present invention relates to a material blending and feeding device for feeding to a molding machine such as Patent Literature 3 describes a flowchart for stopping the weighing operation of the weighing machine at the end of molding.

JP 2013-226672 A (Claim 2, FIG. 1) JP 2003-266164 A (front page, 0001, FIG. 1) JP 2011-20296 A (Claims 4, 0002, 0006, 0007, 0077, FIG. 8)

However, in Patent Document 3, in a plasticizing device for a composite material in which a reinforcing fiber material and a resin material are supplied to a heating cylinder to perform plasticization, at least one of the reinforcing fiber material and the resin material is supplied from a weighing machine (weight feeder). It is not assumed when not supplied. For example, if only the reinforcing fiber material is supplied without supplying the resin material, only the reinforcing fiber material may be clogged in the heating cylinder of the plasticizer, and the screw may be broken. Needless to say, a resin molded product containing good reinforcing fibers cannot be molded unless any material is supplied.

Therefore, the present invention addresses these problems, and material supply is performed from at least one of a reinforcing fiber material supply device capable of measuring the supply amount of the reinforcing fiber material and a resin material supply device capable of measuring the supply amount of the resin material. An object of the present invention is to provide a plasticizing device of an injection molding machine that can appropriately cope with a case where the process is not performed.

The plasticizing device for an injection molding machine according to claim 1 of the present invention is a plasticizing device for an injection molding machine that supplies a reinforcing fiber material and a resin material into a heating cylinder to perform plasticization. a reinforcing fiber material supply apparatus provided with a weight measuring means capable of supplying to measure the weight, and the resin material supplying device is provided with a weight measuring means capable of supplying to measure the supply weight of the resin material, the reinforcing When the material supply weight of at least one of the fiber material supply device and the resin material supply device is less than or less than the lower limit value, it is determined that the weight is abnormal.

In the plasticizing apparatus for an injection molding machine according to claim 2 of the present invention, in claim 1, the material supply weight of at least one of the reinforcing fiber material supply apparatus and the resin material supply apparatus is equal to or less than a lower limit value. Alternatively, it is characterized in that it is determined to be abnormal when the value falls below the lower limit, and the plasticizing device is stopped after completing the molding cycle when it is determined to be abnormal .

A plasticizing device for an injection molding machine according to a third aspect of the present invention is a plasticizing device for an injection molding machine that supplies a reinforcing fiber material and a resin material into a heating cylinder to perform plasticization. a reinforcing fiber material supply apparatus provided with a weight measuring means capable of supplying to measure the weight, and the resin material supplying device is provided with a weight measuring means capable of supplying to measure the supply weight of the resin material, the reinforcing If the material supply weight of at least one of the fiber material supply device and the resin material supply device is less than the command supply amount generated at the time of molding, it is determined to be abnormal.

According to a fourth aspect of the present invention, in the plasticizing apparatus for an injection molding machine according to the third aspect, the command supply amount is generated by a closed loop control that detects a state in a heating cylinder in a previous molding cycle. It is characterized by the following.

The plasticizing device of the injection molding machine of the present invention measures and supplies the supply weight of the reinforcing fiber material in the plasticizing device of the injection molding machine that supplies the reinforcing fiber material and the resin material into the heating cylinder and performs plasticization. A reinforcing fiber material supply device provided with a possible weight measuring means, and a resin material supply device provided with a weight measuring means capable of measuring and supplying the supply weight of the resin material, wherein the reinforcing fiber material supply device or the If the material supply weight of at least one of the resin material supply devices is less than or less than the lower limit value or less than the lower limit value, it is determined that there is an abnormality, so that appropriate measures are taken when material supply from the material supply device is not performed. be able to.

It is a principal part expanded sectional view of the plasticizer of the composite material of this embodiment. It is a flowchart figure of supply abnormality detection control of the plasticizer of the composite material of this embodiment.

The plasticizing device of the injection molding machine according to the present embodiment will be described with reference to FIG. The plasticizing device of the present embodiment is an injection device of an injection molding machine (including an injection compression molding machine) for molding a molded article of a composite material including a carbon fiber material A and a resin material B, which are a kind of reinforcing fiber material. 11 and a material supply device 12 thereof. The heating cylinder 13 of the injection device 11 is a cylindrical member having a predetermined thickness, in which a plurality of heaters 13a and a plurality of thermocouples (not shown) are arranged, and the temperature can be controlled for each zone of each heater 13a. A screw 14 for metering (plasticization) and injection is disposed in an inner hole 13b provided at the center of the heating cylinder 13 in the axial direction so as to be rotatable and move forward and backward. The screw 14 is provided with a flight portion 14a. During the measurement, the screw 14 rotates to feed and store the resin material B including the carbon fiber material A in the inner hole 13b in front of the screw while kneading and plasticizing the resin material. The function of injecting the stored molding material into a cavity in a mold (not shown) by the advance of 14 is provided. The L / D indicating the relationship between the length and the diameter of the screw 14 is not limited to this, but is 15 to 28 as an example. The compression ratio indicating the ratio of the groove cross-sectional area between the feed zone 15 of the screw 14 and the metering zone (not shown) is not limited to this, but is 1.0 to 3.0 as an example.

A nozzle (not shown) is fixed in front of the heating cylinder 13, and during the injection, injection is performed through a nozzle into a cavity in a mold attached to a mold clamping device (not shown). A supply hole 16 for a molding material is provided in an upper portion near the rear of the heating cylinder 13. A housing portion 17 (front plate) is fixed around the supply hole 16 of the heating cylinder 13.

The drive unit and the like of the injection device 11, which is a plasticizing device of the injection molding machine, are well-known and will not be described in detail as shown in the drawings. However, a measurement servomotor 18 for rotating the screw 14 (a measurement motor) An injection servomotor (not shown) for moving the screw 14 back and forth, a load cell (not shown) for detecting a force applied in the axial direction of the screw 14 during injection and weighing, the entire injection device 11 is moved back and forth, and the nozzle is A nozzle touch mechanism (not shown) that presses toward the nozzle touch surface is provided. The measuring servomotor 18 and the injection servomotor are provided with rotary encoders for detecting the number of rotations (rotational angles), and can detect the number of rotations and the axial position of the screw 14. The rotary encoder and the like of the servo motor 18 for measurement are connected to a control device 19 (including a servo amplifier). The rotation torque can be detected by measuring the current value sent to the servo motor 18 for measurement.

The supply hole 20 of the housing part 17 is connected to the supply hole 16 of the heating cylinder 13. A material supply cylinder 21 is provided upward around the supply hole 20 on the upper surface of the housing portion 17.

At a lower position of the material supply cylinder 21, a sensor 41 such as a photoelectric tube for measuring a material supply amount is attached. Further, a stirring device 42 is provided at a position above the sensor 41 of the material supply cylinder 21. The stirring device 42 is installed for the purpose of stirring the carbon fiber material A supplied from the lower supply tube 25 of the reinforcing fiber material supply device 22 and the resin material B supplied from the lower supply tube 26 of the resin material supply device 23. I have. In the present embodiment, the stirrer 42 is provided with a device having a mechanism in which two impeller-shaped rotating bodies are rotated in opposite directions by driving motors. However, the stirring device 42 may have a different shape or a different number of rotating blades or screws from the above, or may be a fixed plate or rod. In the present invention, the material supply amount measuring sensor 41 or the stirring device 42 is not essential, and the inside of the material supply cylinder 21 may be hollow.

The material supply device 12 of the injection device 11 can individually supply the carbon fiber material A and the resin material B without using fiber-containing pellets for performing direct molding. The material supply device 12 measures a supply amount of the carbon fiber material A above the material supply cylinder 21 and supplies a reinforcing fiber material supply device 22 which is a weight-type feeder that can be supplied by closed loop control, and a supply amount of the resin material B. And a resin material supply device 23 which is a weight-type feeder capable of measuring and supplying the measured value through closed loop control.

The reinforcing fiber material supply device 22 will be described first. The reinforcing fiber material supply device 22 is mounted on a separately provided mounting table 27 via a load cell 28 serving as a weight measuring means. Therefore, the reinforcing fiber material supply device 22 is provided independently of the material supply tube 21, and includes the weight of the reinforcing fiber material supply device 22 (including each mechanism and the carbon fiber material A inside the screw tube portion 32 and the hopper 35). ) Can be measured by the load cell 28.

The reinforcing fiber material supply device 22 is provided such that a cylindrical screw cylinder portion 32 in which a feed screw 31 is provided in an inner hole is oriented horizontally or downstream. The lower supply cylinder 25 is mounted below one of the screw cylinder portions 32 (downstream side). The lower supply tube 25 of the reinforcing fiber material supply device 22 is not directly connected to the upper opening 24 of the material supply tube 21. A servomotor 33 for rotating the feed screw 31 is attached to an end of the screw cylinder portion 32 opposite to the side where the lower supply cylinder 25 is provided via a speed reducer. The servo motor 33 and its rotary encoder 43 are connected to the control device 19. Here, the control device 19 is described as a single block, but in practice, generally, each of the weight-type feeders includes a control device (controller) for closed-loop control.

An upper supply hole 34 is provided in an upper portion of the screw cylinder portion 32 opposite to the lower supply tube 25. Above the upper supply hole 34, a hopper 35 serving as a material storage section is attached. A sensor 44 such as a photoelectric tube is provided at a lower position of the hopper 35, and the sensor 44 can detect that the carbon fiber material A has decreased. Above the hopper 35, a reinforcing fiber material supply mechanism 45 is arranged without being directly connected to the hopper 35. The reinforcing fiber material supply mechanism 45 includes a reel 46 on which a continuous carbon fiber material A is wound and a cutter 47. The reinforcing fiber supply mechanism 45 is also connected to the control device 19. When the supplied carbon fiber material (reinforced fiber material) is a chopped fiber (a carbon fiber material bound by a sizing agent) cut in advance to a predetermined length, the reel 46 and the cutter 47 are unnecessary. . The hopper 35 may be provided with a stirrer, a baffle plate, or the like so as to prevent the carbon fiber material A from being clogged in the hopper and to be appropriately dropped toward the lower upper supply hole 34.

The resin material supply device 23 has the same structure as the reinforced fiber material supply device 22 and includes a lower supply cylinder 26, a screw cylinder 36, a feed screw 37, a servomotor 38, an upper supply hole 39, a hopper 40, and the like. It is provided independently without being connected to the material supply cylinder 21 of the injection device 11. A sensor 48 such as a photoelectric tube is provided at a lower position of the hopper 40, and a hose 50 of a supply mechanism 49 of the resin material B is inserted into the upper portion of the hopper 40 in a non-contact state. Therefore, also with respect to the resin material supply device 23, the weight of the resin material supply device 23 (including the resin material B inside each mechanism and the screw cylinder 36 and the hopper 40) can be measured by the load cell 30 on the mounting table 29. Has become.

Note that the reinforcing fiber material supply device 22 and the resin material supply device 23 are not limited to those provided with the feed screws 31 and 37, and may be, for example, a belt-type feeder that sends the molding materials A and B by a belt. In the case of a belt-type feeder, the number of rotations of a motor for circulating the belt is controlled to control the feed amounts of the molding materials A and B. Further, the reinforcing fiber material supplying device 22 and the resin material supplying device 23 are used by supplying the resin material B to the reinforcing fiber material supplying device 22 with the same size and shape, and the carbon fiber material A (the reinforcing fiber Material) can be used. Alternatively, the reinforcing fiber material supply device 22 and the resin material supply device 23 are each dedicated, and may have different shapes or different sizes.

Next, a method of supplying material from the material supply device 12 to the injection device 11 will be described. A carbon fiber material A is stored in the hopper 35 of the reinforcing fiber material supply device 22 as an example, and a resin material B made of a thermoplastic resin is stored in the hopper 40 of the resin material supply device 23 as an example. First, the worker sets the molding conditions and the molding quantity (the number of shots) of the injection molding machine, and stores them in the control device 19. At this time, in the measuring step, a screw rotation speed (the number of rotations per unit time), a measurement completion position (a position of the screw in the axial direction at the time of the measurement completion), and a back pressure value are set. In this embodiment, starvation molding is performed in which the amount of material in the heating cylinder is reduced and plasticization is performed to prevent fiber breakage. The screw rotation speed is preferably not more than a predetermined value, since if the rotation speed (the number of rotations) is too high, the fiber shears by the screw in the heating cylinder 13, it is desirable that the screw rotation speed is not more than a predetermined value. Is preferably 30 to 150 rpm. Further, the back pressure value is desirably low in order to secure the fiber length, and is not limited to this. For example, 0 MPa to 5 MPa in terms of resin pressure is desirable.

The flow chart of FIG. 2 shows the flow of the measuring process at the time of continuous molding. First, the control of the measuring process of the injection device 11 will be described with reference to the right side of the flowchart. First, when a predetermined time elapses after the injection, the weighing process is started (s1). In response to a command to start the measuring process, the measuring servomotor 18 is rotated at the set number of revolutions, and the screw 14 is rotated. By measuring a current value sent to the motor during the weighing process, the rotation torque of the weighing servomotor 18 is detected (s2). The detection of the rotational torque is for detecting the state in the heating cylinder in the measuring step of the molding cycle. In the present embodiment, the supply amount of the base carbon fiber material A is determined from the weight of the molded article and the ratio (% by weight) of the carbon fiber material. Then, the command supply amount g of the carbon fiber material A at the time of the next material supply is determined by adding or subtracting to or from the supply amount serving as the base using the detected value of the rotational torque (s3).

Then, as the measuring process proceeds, the molding material in which the resin is melted is stored in front of the screw, and the screw 14 retreats, and it is determined whether or not the screw 14 reaches the metering completion position (s4). When the screw 14 reaches the measurement completion position (s4 = Y), the measurement process is completed (s5). Next, one molding cycle is completed through an injection step, a cooling step, etc. (not shown and detailed description) (s6). Then, it is determined whether there is an alarm signal described later (s7). If there is no alarm signal (s7 = Y), it is next determined whether the molding quantity has reached a preset quantity (s8). If the number has not reached (s8 = N), the process proceeds to the next molding cycle.

Next, the control of the reinforcing fiber material supply device 22 and the resin material supply device 23 of the weight type feeder performed in parallel with the measuring process will be described with reference to the left part of the flowchart. Since the reinforcing fiber material supply device 22 and the resin material supply device 23 perform the material supply and the detection of the abnormal material supply under substantially the same control, the control of the reinforcement fiber material supply device 22 will be described. Simultaneously with or slightly before or after the start of measurement s1, the servo motor 33 of the reinforcing fiber material supply device 22 is driven to rotate the feed screw 31 to supply the carbon fiber material A in the hopper 35 toward the heating cylinder 13. Is started (s9). As described in (s2) and (s3) in the flowchart, the command supply amount g at this time is obtained by detecting the state in the heating cylinder 13 such as the detection value of the rotational torque of the measuring servomotor 18 in the previous measuring step. It was generated by

Although not described in the flowchart, the supply of the carbon fiber material A from the supply mechanism 45 of the reinforcing fiber material into the hopper 35 is stopped when the material is supplied by driving the servo motor 33. When the carbon fiber material A is supplied, the load cell 28 measures the weight of the carbon fiber material A in the reinforcing fiber material supply device 22. Then, when it is measured that the weight of the carbon fiber material A has decreased by the command supply amount g from the weight at the start of supply, the command supply amount g is regarded as the completion of the supply of the carbon fiber material A (s10 = Y), the drive of the servomotor 33 is stopped to stop the supply of the carbon fiber material A (s11). In this case, it is determined that the supply state of the reinforcing fiber material supply device 22 is normal, and as described above, the injection step and the cooling step are performed after the completion of the measurement step, and one molding cycle is completed (s6).

In the case where the command supply amount g has not been completely supplied in (s10) and the timer has timed out after a predetermined supply time t set in advance (s12 = Y), the supply state of the reinforcing fiber material supply device 22 becomes It is determined that the amount is less than the command supply amount g (lower limit value) and is abnormal, and an alarm signal is issued (s13). Then, it is displayed on the display screen of the injection molding machine that the supply state of the reinforcing fiber material supply device 22 is abnormal (s14). However, even when the alarm signal is issued, the molding material supplied up to the previous time still remains in the heating cylinder 13 and one measurement can be accurately performed. (s4 = Y) is determined, the weighing is completed (s5), and the molding cycle (predetermined procedure) is completed (s6). Then, the injection molding machine is stopped because there is an alarm signal (s7 = N). Alternatively, on the side of the mold clamping device, when the cooling step (predetermined procedure) is completed, the device may be stopped as it is.

The causes of the abnormal supply state of the material supply device 12 including the reinforcing fiber material supply device 22 are roughly classified into the following three cases.
(1) When there is no continuous carbon fiber material A on the reel of the reinforcing fiber material supply mechanism, or when the hopper 35 becomes empty due to the supply shortage of the carbon fiber material A due to a failure of the reinforcing fiber material supply mechanism. .
(2) When the carbon fiber material A is present in the hopper 35 but the material is clogged in the upper part of the upper supply hole 34 or in the upper supply hole 34 and the carbon fiber material A is not supplied to the feed screw 31 (3). When the carbon fiber material A in the material supply cylinder 21 is full due to a bridge phenomenon or the like and the supply of the next carbon fiber material A cannot be performed smoothly, the above (1) and (2) can be distinguished from the reinforcing fiber. The determination can be made based on the difference in the weight detected by the load cell 28 of the material supply device 22. The above (3) also differs depending on the presence or absence and type of the sensor 41 and the material stirring device 42, but when the carbon fiber material A or the like is deposited on the upper portion of the stirring device 42, the torque of the motor of the stirring device 42 is An abnormality can be determined based on a change in the value or the torque value of the servo motor 33. Therefore, in the present embodiment, when performing the abnormality display (s14), it is also possible to display which part of the material supply device 12 is causing the supply abnormality. As a result, the operator can quickly take measures against the abnormality of the material supply device 12.

The control of the resin material supply device 23 is performed in the same manner as the supply of the reinforcing fiber material supply device 22. That is, the supply amount of the base resin material B is determined from the ratio of the weight of the molded article to the resin material (% by weight), and the supply amount of the base resin material is determined using the detected value of the rotational torque. The command supply amount g of the resin material at the time of the next material supply is determined by adding or subtracting. The abnormal stop control of the supply amount of the reinforcing fiber material supply device 22 and the abnormal stop control of the supply amount of the resin material supply device 23 are configured in a circuit under AND conditions, and the material supply amount of at least one of the material supply devices 22 and 23 is commanded and supplied. If the amount is less than the amount g, the fact that an abnormality has occurred is displayed or notified. It can be easily determined which of the reinforcing fiber material supply device 22 and the resin material supply device 23 has a supply abnormality.

In addition, the supply of the carbon fiber material A from the fiber material supply mechanism 45 to the hopper 35 is performed in a fixed amount when the sensor 44 of the hopper 35 detects a decrease in the material. Therefore, the supply of the carbon fiber material A from the fiber material supply mechanism 45 into the hopper 35 is performed irrespective of one molding cycle. However, as described above, when the servo motor 33 is operated to supply the carbon fiber material A from the hopper 35 into the heating cylinder 13, the supply into the hopper 35 is stopped and is not performed. . The supply of the carbon fiber material A from the fiber material supply mechanism 45 into the hopper 35 may be performed every time a molding cycle is performed. The same applies to the supply of the resin material from the resin material supply source mechanism 49 to the hopper 40.

Next, a modified example of the above embodiment will be described. The method for generating the command supply amount g of the carbon fiber material A or the resin material B is not limited to the method using the detected value of the torque of the measuring servomotor 18 in the previous molding cycle. For example, an average value, a differential value, or the like of the torque detected during a plurality of continuous molding cycles or a plurality of discontinuous molding cycles may be used. Instead of using the torque (current value), the amount of the molding material in the heating cylinder 13 may be directly measured by a reflection type ultrasonic sensor or the like. Alternatively, the supply command amount g may be generated by detecting the state in the heating cylinder in the molding cycle using the time until the screw 14 reaches the measurement completion position in the measurement process or the rotation amount of the screw 14. Further, the command supply amount each time may be a fixed value. When the command supply amount is fixed each time, controlling the amounts of the molding materials A and B in the heating cylinder becomes a problem. Then, when the sensor 41 such as a photoelectric tube provided in the material supply cylinder 21 confirms the rise of the material in the supply cylinder, the supply of the molding materials A and B is stopped for a predetermined number of molding cycles, and the material in the heating cylinder is stopped. To the appropriate amount. If the molding material in the heating cylinder is excessively reduced, the molding material in the heating cylinder is returned to an appropriate amount by, for example, supplying molding materials A and B for two shots.

In addition, the method of changing the supply control of the reinforcing fiber material supply devices 22 and 23 with respect to the increase and decrease of the command supply amount g may be such that the number of rotations (the supply amount per unit time) of the servomotor 33 is the same and the supply time is changed. The supply amount may be changed by changing the rotation speed (supply amount per unit time). The command supply amount per unit time may be used for determining the supply state abnormality of the material supply device 12 including the material supply devices 22 and 23, instead of the command supply amount g for one time. As described above, when the command supply amount per unit time (the number of rotations of the servo motors 33 and 38) is the same, the supply amount is not compared after waiting for the completion of the supply of the molding material for one molding cycle. May be determined as a supply abnormality when it is detected that the supply amount is lower than a preset supply amount (lower limit value).

Further, a lower limit of the supply amount set in advance for judging abnormality of the supply state of the material supply device 12 may be provided separately from the command supply amount g of the molding materials A and B. That is, the command supply amount g at the time of the next molding cycle generated based on the torque value of the measuring servomotor 18 as described above slightly changes every time. However, the value for judging the abnormality of the material supply device 12 may be one in which a fixed value lower than the case where the command supply amount g is minimum is set and input as a lower limit value in advance. When the actually measured supply amount falls below the lower limit or falls below the lower limit, it is determined that the supply is abnormal. Such a fixed value input requires a setting operation, but the load on program creation is often reduced. Even if the lower limit is set as described above, it can sufficiently cope with the detection when the hoppers 35 and 40 are empty, or when the molding materials A and B are not supplied at all due to material clogging. .

Furthermore, the timing of supplying the molding materials A and B into the heating cylinder 13 from the material supply devices 22 and 23, which are weight-type feeders, does not need to completely coincide with the measuring time, and may be slightly different. Further, the supply timing is not limited to the time of the measurement, and the supply of the material may be performed also in the injection step or the like. In addition, one molding material for each molding cycle. Instead of supplying B into the heating cylinder 13, the molding materials A and B for a plurality of molding cycles may be supplied at once. In this case, when the supply amount from the material supply devices 22 and 23 falls below the supply weight (lower limit value) for a plurality of times, it is determined that an abnormality has occurred and an alarm signal is transmitted.

Also, the method of using the alarm signal is not limited to the above embodiment, and various application examples can be considered. For example, a warning light or a warning sound may be used to notify the user based on an alarm signal relating to the abnormality of the material supply device 12. Further, based on the notification, the worker performs a recovery operation, and when it is confirmed that the supply amount based on the command amount is supplied in the material supply devices 22 and 23, the continuous molding is continued without stopping the injection molding machine 11. It may be something.

The detection that the hoppers 35 and 40 are empty can be performed by detecting the material shortage even after a predetermined time has elapsed since the sensors 44 and 48 detect the material shortage and send the material supply instruction to the supply source mechanisms 45 and 49. May be detected by continuing. Further, when the hoppers 35 and 40 have a stirring device driven by a motor, the stirring device may be operated based on the alarm signal relating to the abnormality of the material supply device 12 described above. In that case, the problem can be solved only when the molding materials A and B are clogged in the hoppers 35 and 40. In the case where the clogging molding material is a reinforcing fiber material, if the stirring is always performed too much in the hopper 35, the binding between the fibers is separated and a bridging phenomenon occurs. Therefore, it is also desirable to stir when a problem occurs.

The present invention will not be enumerated one by one, but the present invention is not limited to the above-described embodiment, and also includes those obtained by combining the above descriptions and those modified by a person skilled in the art based on the gist of the present invention. It goes without saying that it applies.

The plasticizing device of the injection molding machine may be a plasticizer (registered trademark) type injection device having a plasticizing device provided with a heating cylinder containing a screw and a heating cylinder containing a plunger. Further, the injection device may be provided with a heating cylinder having a built-in plunger for heating the molding material using a torpedo or the like. In addition, these plasticizing devices that perform starvation supply may perform a vacuum state or a reduced pressure state in the heating cylinder 13, and may introduce an inert gas. In addition, the injection molding machine may be a machine that directly supplies an injection from an injection device to an opened mold cavity, and then molds the mold with the mold closed.

Furthermore, the reinforcing fiber material supplied to the plasticizing device is not limited to the carbon fiber material A, but may be another reinforcing fiber material such as glass fiber or a mixed fiber of glass fiber and carbon fiber. For the resin material B, a thermoplastic resin is preferably used, but the type is not limited, and a thermosetting resin or a mixed resin of a thermosetting resin and a thermoplastic resin may be used.

11 Injection device (plasticizing device)
REFERENCE SIGNS LIST 12 Material supply device 13 Heating cylinder 14 Screw 18 Metering servomotor 19 Control device 22 Fiber material supply device 23 Resin material supply device 28, 30 Load cell 31.37 Feed screw 33, 38 Servo motor 35, 40 Hopper A Carbon fiber material B Resin material g Command supply amount

Claims (4)

In the plasticizing device of the injection molding machine that supplies the reinforcing fiber material and the resin material into the heating cylinder to perform plasticization,
A reinforcing fiber material supply device having a weight measuring means capable of measuring and supplying a supply weight of the reinforcing fiber material,
A resin material supply device provided with a weight measuring unit capable of measuring and supplying the supply weight of the resin material is provided,
Plasticizing of an injection molding machine, wherein if the material supply weight of at least one of the reinforcing fiber material supply device and the resin material supply device is less than or less than a lower limit value or less than a lower limit value, it is determined to be abnormal; apparatus. If the material supply weight of at least one of the reinforcing fiber material supply device and the resin material supply device is less than or less than a lower limit value or less than a lower limit value, it is determined to be abnormal, and a molding cycle when it is determined to be abnormal The plasticizing device for an injection molding machine according to claim 1, wherein the plasticizing device is stopped after completing the above. In the plasticizing device of the injection molding machine that supplies the reinforcing fiber material and the resin material into the heating cylinder to perform plasticization,
A reinforcing fiber material supply device having a weight measuring means capable of measuring and supplying a supply weight of the reinforcing fiber material,
A resin material supply device provided with a weight measuring unit capable of measuring and supplying the supply weight of the resin material is provided,
An injection molding machine characterized in that when the material supply weight of at least one of the reinforcing fiber material supply device and the resin material supply device is less than a command supply amount generated at the time of molding, it is determined to be abnormal. Plasticizing equipment. 4. The plasticizing apparatus according to claim 3, wherein the command supply amount is generated by a closed loop control that detects a state in the heating cylinder in a previous molding cycle. 5.

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