KR20190104117A - Injection molding machine - Google Patents

Abstract

Provided by the present invention is an injection molding machine which is able to accurately set the supply amount of a material supply device. The injection molding machine (2) includes: a cylinder (11); a material supply device (81) which supplies a molding material into a cylinder (11); a screw (20) which is arranged to be able to rotate in the cylinder (11) or retractable axially; and a setting support device (40) which supports the setting of the injection molding machine (2). The setting support device (40): memorizes relationship between the supply amount of a material supply device (81) and the flow rate of the molding material sent to the front side of a screw (20) by rotating the screw (20); and sets the supply amount of the material supply device (81) when molding based on the memorized relationship, weighing time, and the amount of a molding material for one shot quantity.

Description

Injection Molding Machine {INJECTION MOLDING MACHINE}

This application claims priority based on Japanese Patent Application No. 2012-233106 for which it applied on October 22, 2012. The entire contents of that application are incorporated herein by reference.

The present invention relates to an injection molding machine.

The injection molding machine includes a cylinder, a material supply device for supplying resin as a molding material into the cylinder, and a screw disposed in the cylinder so as to be rotatable and retractable. The resin supplied into the screw groove of the screw by the material supply device is sent forward in accordance with the rotation of the screw, and gradually melts due to heat from the cylinder or the like. As the molten resin is sent to the front of the screw and accumulated in the front part of the cylinder, the screw is retracted. Thereafter, when the screw is advanced, the molten resin accumulated in front of the screw is injected from the nozzle formed at the tip of the cylinder, and filled in the cavity space of the mold apparatus. A molded article is obtained by solidifying the filled molten resin (for example, refer patent document 1).

Japanese Patent Publication No. 2004-351661

Since the supply amount of the material supply device is set by trial and error, depending on the user's experience, sense, or the like, there are cases where the supply amount of the material supply device is not set correctly.

This invention is made | formed in view of the said subject, and an object of this invention is to provide the injection molding machine which can set the supply amount of a material supply apparatus correctly.

In order to solve the above problems, the injection molding machine of one embodiment of the present invention,

Cylinders,

A material supply device for supplying molding material into the cylinder;

A screw disposed rotatably and axially retractable in the cylinder,

Equipped with a setting support device for supporting the setting of the injection molding machine,

The setting support device stores the relationship between the supply amount of the material supply device and the flow rate of the molding material sent to the front of the screw by rotating the screw, and the stored relationship, the metering time, and one shot Based on the amount of molding material, the supply amount of the material supply apparatus at the time of molding is set.

According to the present invention, an injection molding machine capable of accurately setting the supply amount of a material supply device is obtained.

1 is a view showing an injection molding machine of an embodiment of the present invention.
2 is a view showing the driving device of FIG.
Fig. 3 is a diagram showing an example of the relationship between the rotational speed of the feed screw and the resin flow rate indicating the supply amount of the material supply device.
4 is a diagram showing an example of a time change of the actual back pressure of the screw during the purge operation.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated with reference to drawings. In each figure, the same or corresponding code | symbol is attached | subjected about the same or corresponding structure, and description is abbreviate | omitted. In the following, the injection direction of the resin is set to the front, and the opposite direction to the injection direction of the resin is explained to the rear.

The injection molding machine includes a mold closing process for closing a mold device consisting of a fixed mold and a movable mold, a mold fastening process for fastening a mold device, a filling process for introducing a molten resin into the mold device, and a pressure holding process for applying pressure to the introduced resin. , A cooling step of solidifying the resin in the mold apparatus after the holding pressure step, a weighing step of weighing the molten resin for the next molded article, a mold opening step of opening the mold apparatus, and a take-out step of taking out the molded article from the mold apparatus after the mold opening. 1 cycle, and a molded article is repeated and manufactured. In order to shorten a molding cycle, a measurement process may be performed between cooling processes.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the injection molding machine of one Embodiment of this invention. The injection molding machine 2 has a mold clamping device and an injection device 10. The mold clamping device includes a stationary platen on which the stationary mold is mounted and a movable platen on which the movable mold is mounted. Open. The mold clamping device may be any of a toggle type using an electric motor and a toggle mechanism, a direct pressure type using a fluid pressure cylinder, an electronic type using a linear motor and an electromagnet, and the method is not particularly limited.

The injection apparatus 10 includes a cylinder 11 to which a molding material (for example, resin pellets) is supplied, a nozzle 12 disposed at the front end of the cylinder 11, and a cylinder 11 to be rotatable. The screw 20 arrange | positioned so that advancement and retraction in the axial direction, the heater h11-h13 as a heating source which heats the cylinder 11, and the drive device 60 arrange | positioned at the back of the cylinder 11 are included.

The screw 20 consists of the screw main body 21 and the injection part 22 arrange | positioned ahead of the screw main body 21, and is connected with the drive device 60 via the shaft part 51 of the rear end. The screw main body 21 is equipped with the flight part 23 and the pressure member 24 arrange | positioned so that attachment or detachment with respect to the front end of the flight part 23 is possible. The flight part 23 is provided with the rod-shaped main-body part 23a and the spiral shaped flight 23b which protruded to the outer peripheral surface of the main-body part 23a, and spiral screw groove along the flight 23b. 26 is formed. From the rear end to the front end of the flight part 23, the depth of the screw groove 26 may be constant, and the screw compression ratio may be constant.

However, without arranging the pressure member 24, the flight part may be formed over the entire screw main body 21, and the screw main body 21 may be supplied from the rear end to the front end of the supply unit to which the resin is supplied and the supplied resin. You may distinguish as a compression part which melt | dissolves, compressing, and a measurement part which measures melted resin by fixed amount. The depth of the screw groove is deeper in the supply part, shallower in the metering part, and shallower toward the front in the compression part.

The injection part 22 is arrange | positioned around the head part 31 provided with the conical part at the front end, the rod part 32 formed adjacent to the back of the head part 31, and the rod part 32. It consists of a backflow prevention ring 33 and a seal ring (check ring) 34 mounted at the front end of the pressure member 24.

At the time of the metering process, as the screw 20 retreats, the backflow prevention ring 33 moves forward with respect to the rod part 32, and moves away from the rear end of the injection part 22 when it is separated from the seal ring 34. Resin is sent. In addition, during the injection process, as the screw 20 moves forward, when the backflow prevention ring 33 is moved backward with respect to the rod part 32 and comes into contact with the seal ring 34, the backflow of the resin is prevented. do.

In the vicinity of the rear end of the cylinder 11, a resin supply port 14 as a molding material supply port is formed, and the resin supply port 14 moves the screw 20 to a forward limit position in the cylinder 11. It is formed in the position which opposes the rear end part of the screw groove 26 in the mounted state. The resin supply port 14 is equipped with a material supply device 81 for supplying resin into the cylinder 11.

The material supply device 81 includes a hopper 82 for receiving molding material (for example, resin pellets), a feed cylinder 83 extending horizontally from a lower end of the hopper 82, and a front end of the feed cylinder 83. A cylindrical guide portion 84 extending downward from the feeder, a feed screw 85 rotatably disposed in the feed cylinder 83, a feed motor 86 for rotating the feed screw 85, and the like. . In addition, the feed cylinder 83 does not necessarily need to extend in a horizontal direction, for example, may be inclined with respect to a horizontal direction, and an exit side may be higher than an inlet side.

The resin supplied from the hopper 82 into the feed cylinder 83 is advanced along the screw groove of the feed screw 85 as the feed screw 85 rotates. The resin sent from the front end of the feed screw 85 into the guide part 84 falls in the guide part 84, and is supplied to the cylinder 11. However, the resin supplied in the feed cylinder 83 may be heated (preheated) by the heater which is not shown in figure. At this time, the resin may be preheated to a temperature at which it does not melt, for example, a predetermined temperature below the glass transition point.

FIG. 2 is a diagram illustrating the drive device of FIG. 1. The drive device 60 includes a metering motor 61 as a drive source for rotating the screw 20 in the cylinder 11. The metering motor 61 may be a servomotor. The metering motor 61 includes a stator 62 fixed to the support frame Fr, and a cylindrical rotor 63 disposed inside the stator 62. The spline nut 64 fixed to the rear end of the rotor 63 is splined to the rotating member 65. That is, the rotation member 65 is rotatable with the spline nut 64, and can be moved forward and backward with respect to the spline nut 64. As shown in FIG. The rotating member 65 includes a connecting body 66 connected to the rear end of the shaft portion 51 of the screw 20 via the coupling 52, and a support 67 fixed to the connecting body 66 by bolts or the like. It consists of. On the outer circumference of the support 67, a spline groove 68 for engaging with the spline nut 64 is formed. Rotation of the metering motor 61 is transmitted to the shaft part 51 via the rotation member 65, and the screw 20 rotates. Then, the flight 23b of the flight part 23 moves, and the resin supplied in the screw groove 26 of the flight part 23 is sent forward.

The drive device 60 includes an injection motor 71 as a drive source for moving the screw 20 in the axial direction in the cylinder 11. The injection motor 71 may be a servo motor. The injection motor 71 has a cylindrical output shaft (not shown), and a ball screw shaft 72 is splined to the output shaft. That is, the ball screw shaft 72 is rotatable together with the output shaft of the injection motor 71, and can be moved forward and backward with respect to the output shaft of the injection motor 71. FIG. The ball screw nut 73 screwed to the ball screw shaft 72 is fixed to the support frame Fr via the load cell 74. The load cell 74 is disposed between the support frame Fr and the injection motor 71 to detect the back pressure (pressure for pressing the screw 20 forward) of the screw 20. The shaft 75 extending coaxially from the front end of the ball screw shaft 72 is rotatably and non-retractably supported relative to the rotating member 65 via the bearings Br1 and Br2. When the injection motor 71 is driven, the ball screw shaft 72 is rotated and retracted, and the rotating member 65 and the screw 20 are advanced. When the screw 20 is advanced in the filling process, the rotation of the rotating member 65 may be stopped by driving the metering motor 61 so that the screw 20 does not rotate. However, the metering motor 61 may be a motor equipped with a brake, or may stop the rotation of the rotating member 65 by the braking force of the brake in the filling process.

However, the drive device 60 should just be a thing which can rotate or advance the screw 20 in the cylinder 11, The structure is not limited to the structure of FIG.

Next, the operation of the injection molding machine 2 will be described. The operation of the injection molding machine 2 (for example, the operation of the injection device 10 or the operation of the material supply device 81) is controlled by the controller 40. The controller 40 includes a CPU 41, a ROM 42 for storing control programs, a read / write RAM 43 for storing calculation results, a storage unit 44 such as a hard disk, an input interface, and an output. Interface, timer, counter, and the like. The controller 40 implements various functions by executing the program stored in the ROM 42 or the storage unit 44 or the like by the CPU 41.

In the metering step, the metering motor 61 is driven to rotate the screw 20. At this time, the feed motor 86 may be driven to rotate the feed screw 85, and the screw 20 and the feed screw 85 may be rotated in synchronization during molding. The electric current is supplied to the metering motor 61 so that the rotation speed of the screw 20 may be set, and the electric current is supplied to the feed motor 86 so that the rotation speed of the feed screw 85 may be set.

What is necessary is just to set the rotation speed of the screw 20 and the rotation speed of the feed screw 85, respectively. That is, the ratio (synchronization rate) between the set rotation speed of the screw 20 and the set rotation speed of the feed screw 85 should just be constant.

In addition, the set rotation speed of the screw 20 and the set rotation speed of the feed screw 85 may respectively be changed according to the position of the screw 20, the elapsed time since the measurement start, etc., respectively. In addition, the synchronization rate may be changed depending on the position of the screw 20, the elapsed time from the start of weighing, and the like.

The resin supplied from the hopper 82 into the feed cylinder 83 is advanced along the screw groove of the feed screw 85 as the feed screw 85 rotates. Resin sent to the guide part 84 from the front end of a feed screw falls in the guide part 84, and is supplied to the cylinder 11.

The resin supplied into the cylinder 11 may be immediately forwarded by the screw 20 without remaining in the resin supply port 14. For this reason, resin is not densely packed in the screw groove 26 of the screw 20, and the resin state in the screw groove 26 is in a lean state (hunger state). Therefore, as the supply speed of the resin by the material supply device 81 increases, the amount of resin sent forward per unit time by the screw 20 increases.

The resin supplied into the cylinder 11 is advanced along the screw groove 26 of the screw 20 as the screw 20 rotates, and is heated and melted by the heaters h11 to h13. Moreover, resin is gradually pressed from the pressure rise start position of resin in the screw main body 21 to the front end of the screw main body 21. FIG. The pressure increase start position is located at a position separated from the pressure member 24 to the rear by a predetermined distance, and is displaced according to the ratio (synchronization rate) of the rotation speed of the screw 20 and the rotation speed of the feed screw 85 and the like. do. When there is a pressure rise start position at a distance within the predetermined range from the pressure member 24, the molten state of the resin is stabilized and the weight of the molded article is stabilized.

The resin advanced along the screw groove 26 of the screw 20 passes through the resin flow path between the pressure member 24 and the cylinder 11, and after being kneaded therebetween, the cylinder 11 and the rod portion. It advances through the resin flow path between (32), is sent to the front of the screw (20), and accumulates in a cylinder front part. As the molten resin accumulates in front of the screw 20, the screw 20 retreats.

In the metering step, the injection motor 71 is driven to apply back pressure to the screw 20 to suppress sudden retraction of the screw 20. As a result, the kneading property of the resin is improved, and the gas in the resin tends to escape to the rear. The current is supplied to the injection motor 71 so that the back pressure of the screw 20 becomes the set back pressure.

While retracting the screw 20, the controller 40 monitors the position of the screw 20 with a position sensor not shown. When the screw 20 retreats to the weighing complete position and a predetermined amount of resin is accumulated in front of the screw 20, the driving of the metering motor 61 is stopped, and the rotation of the screw 20 is stopped, and the weighing process Is complete. Simultaneously with the completion of the metering process, the drive of the feed motor 86 may be stopped and the rotation of the feed screw 85 may be stopped.

In the filling step, the injection motor 71 is driven, the screw 20 is advanced, and the resin is pushed into the cavity space in the mold apparatus in the mold clamping state. The pressure at which the screw 20 presses the resin forward (filling pressure of the resin) is detected as a reaction force by the load cell 74. Since the resin filled in the cavity space is shrunk by cooling, in order to replenish the resin of the shrinkage, in the holding step, a current is supplied to the injection motor 71 so that the filling pressure of the resin becomes the set pressure.

By the way, before the start of molding, the user or the like determines the weighing time (rotation time of the screw 20). The metering time is determined according to the cooling time so that the metering process is performed between the cooling processes for shortening the molding cycle. The metering time may be set so that the completion of the metering step is approximately coincident with the completion of the cooling step.

At a predetermined metering time, the supply amount of the material supply device 81 at the time of molding is determined so that the resin in an amount equal to one shot is sent to the front of the screw 20. This supply is expressed as the product of feed rate and feed time. The supply time is the same as the weighing time when the screw 20 and the feed screw 85 are rotated in synchronization, and the supply time is automatically determined when the weighing time is determined. The feed rate is proportional to the rotational speed of the feed screw 85. Therefore, the rotation speed of the feed screw 85 which shows supply amount may be determined.

In this embodiment, the controller 40 functions as a setting support apparatus for supporting the setting of the injection molding machine 2. However, the setting support apparatus may be provided separately from the controller 60 for controlling the operation of the injection apparatus 10 or the operation of the material supply apparatus 81.

The controller 40 as the setting support device is a rotation speed of the feed screw 85 indicating the supply amount of the material supply device 81 and the flow rate of the resin sent to the front of the screw 20 by rotating the screw 20 ( Hereinafter, the relationship with " resin flow rate " is simply referred to. The relationship is stored in the ROM 42 or the storage unit 44 or the like, for example in the form of an equation or the like.

The controller 40 sets the rotation speed of the feed screw 85 indicating the supply amount of the material supply device 81 based on the stored relationship, the metering time, the amount of resin for one shot, and the like. Various data used in this setting (e.g., data related to the above-mentioned relationship, weighing time, amount of resin for one shot, etc.) may be input to the controller 40 through the input unit 45 that accepts the user's input operation. The data stored in the ROM 42, the storage unit 24, or the like may be used. The amount of resin (mm ³ ) for one shot is calculated based on the retraction distance of the screw 20 and the inner diameter of the cylinder 11 (outer diameter of the screw 20) in the measuring step.

Fig. 3 is a diagram showing an example of the relationship between the rotational speed of the feed screw and the resin flow rate indicating the supply amount of the material supply device. As shown in FIG. 3, the relationship may be approximated by a formula such as a linear linear equation, and the resin flow rate (mm ³ / s) increases in proportion to the rotational speed (rpm) of the feed screw 85. The controller 40 rotates the number of rotations of the feed screw 85 at the time of molding so that the value obtained by dividing the resin amount (mm ³ ) for one shot by the resin flow rate (mm ³ / s) becomes a predetermined measurement time (s). Set (rpm).

The relationship may be measured at the time of purge operation. The purge operation is an operation for stabilizing the molten state of the resin in the cylinder 11 before the start of molding, and is an operation for supplying the resin into the cylinder 11 and discharging the supplied resin. The purge operation is performed in a state where the nozzle 12 is separated from the mold apparatus, and resin is not filled in the mold apparatus, so that the solidified resin is not taken out from the mold apparatus. In addition, since the purge operation is performed before the start of molding, the above relationship can be measured before the start of molding.

As a purge operation | movement, there exist many types, For example, you may rotate the screw 20, applying back pressure to the screw 20 similarly to a metering process. As the resin is sent to the front of the screw 20 and accumulated in the cylinder front part, the screw 20 is retracted. After that, when the screw 20 is advanced, the molten resin accumulated in front of the screw 20 is discharged from the nozzle 12 formed at the front end of the cylinder 11.

When the above relationship is obtained during this purge operation, the resin flow rate (mm ³ / s) is measured by rotating the screw 20 while applying the back pressure to the screw 20, and the resin flows to the front of the screw 20. The amount mm ³ is calculated by dividing by the rotation time s of the screw 20. The amount of resin (mm ³ ) sent to the front of the screw 20 is equal to the amount of change in the volume of the space formed in front of the screw 13 in the cylinder 11, and the inner diameter of the cylinder 11 and The amount of retraction of the screw 20 is calculated.

By the way, resin may be fixed to the inner wall of the cylinder 11 by friction, and resin may become a nut. When the screw 20 rotates with respect to the nutted resin, the screw 20 retreats even though the resin is not sent to the front of the screw 20.

Therefore, as another purge operation | movement, it mentions later in detail, You may rotate the screw 20 which retracted to the predetermined position in the predetermined position. This purge operation will be described in detail below.

The controller 40 first drives the injection motor 71 to retreat the screw 20. While retracting the screw 20, the screw 20 does not have to rotate. While retracting the screw 20, the controller 40 monitors the position of the screw 20 with a position sensor not shown.

When the screw 20 is retracted, a space is formed in the cylinder 11. This space is formed in front of the screw 20, and the volume (mm ³ ) is based on the retraction distance (mm) of the screw 20, the inner diameter of the cylinder 11 (the outer diameter of the screw 20), and the like. Is calculated.

Subsequently, the controller 40 drives the metering motor 61 to rotate the screw 20 at a predetermined rotational speed to send the resin to the front of the screw 20. At this time, the controller 40 may drive the injection motor 71 in order to prohibit the advance and retreat of the screw 20. At this time, the controller 40 may drive the feed motor 86 to rotate the feed screw 85, and the screw 20 and the feed screw 85 may rotate in synchronization.

In the present embodiment, however, the injection motor 71 is driven to prohibit the retraction of the screw 20. However, when the injection motor 71 is equipped with a brake, the screw 20 is retracted by the braking force of the brake. It may be prohibited.

Resin is sent to the front of the screw 20 with the rotation of the screw 20, and resin accumulates in the space formed in the cylinder 11 before the rotation of the screw 20 starts. Until this space is filled with resin, the back pressure of the screw 20 hardly changes, and when this space is filled with the resin, the back pressure of the screw 20 starts to rise rapidly.

4 is a diagram showing an example of a time change of the actual back pressure of the screw during the purge operation. 4 shows a time change of the back pressure from the start of rotation of the screw 20.

As shown in FIG. 4, when the screw 20 starts to rotate at the time t1, the back pressure of the screw 20 will hardly fluctuate until the space is filled with resin, and if the space is filled with resin, The back pressure of the screw 20 starts to rise sharply. When the back pressure of the screw 20 is raised to some extent, the resin is discharged from the nozzle 12, so that the back pressure of the screw 20 becomes constant soon.

When the above relationship is obtained during this purge operation, the resin flow rate is measured by rotating the screw 20 retracted to a predetermined position at the predetermined position. Retraction of the screw 20 is prohibited during the rotation of the screw 20, and the effect of the nutring of the resin, which may occur when the screw 20 is allowed to retreat during the rotation of the screw 20, can be excluded. And the measurement accuracy of resin flow rate is good.

The controller 40 is the time (T (s)) from the start of rotation of the screw 20 until the back pressure of the screw 20 reaches a predetermined value, and the volume of the space (mm ³ ) is divided and the resin flow rate (mm ³ / s) is calculated. The volume (mm ³ ) of the space is the same amount as that of the resin sent in front of the screw 20 during the time T. The time T is measured by the timer of the controller 40.

The retraction completion position of the screw 20 during this purge operation may be approximately the same position as the measurement completion position. In this case, the back pressure of the screw 20 reaches a predetermined value from the start of rotation of the screw 20. The time T until until becomes substantially the same as the weighing time. Resin flow volume can be measured on the conditions similar to a measurement process.

However, the retreat completion position of the screw 20 does not need to be about the same position as the measurement completion position, and is not specifically limited. Regardless of the retraction distance of the screw 20, the resin flow rate can be calculated.

The controller 40 may calculate the resin flow rate when the rotation speed of the feed screw 85 is changed in order to obtain the above relationship, and the plurality of resin flow rates corresponding to the rotation speeds of the plurality of feed screws 85 may be used. To calculate.

When the above relationship is obtained, the screw (in accordance with the change of the rotation speed of the feed screw 85 so that the ratio between the rotation speed of the screw 20 and the rotation speed of the feed screw 85 becomes the same ratio as the molding time) The rotation speed of 20 may be changed. The controller 40 selects the rotation speed of the feed screw 85 at the time of molding and the rotation speed of the screw 20 at the time of molding based on the stored relationship, the weighing time, and the amount of molding material for one shot. Can be set to Therefore, the pressure increase start position of resin can be made into a desired position, the molten state of resin is stabilized, and the weight of a molded article is stabilized.

However, when obtaining the said relationship, the rotation speed of the screw 20 does not need to be changed according to the change of the rotation speed of the feed screw 85, and the rotation speed of a screw may be constant. That is, when calculating the relationship, the ratio between the rotational speed of the screw 20 and the rotational speed of the feed screw 85 does not have to be constant. In this case, after setting the rotation speed of the feed screw 85 at the time of shaping | molding based on the said relationship etc., the controller 40 ratios with the rotation speed of the feed screw 85 at the time of shaping | molding are predetermined ratio You may set the rotation speed of the screw 20 at the time of shaping | molding so that it may become.

In this way, the controller 40 stores the relationship between the supply amount of the material supply device 81 (for example, the rotation speed of the feed screw 85) and the resin flow rate, and the stored relationship, the weighing time, and 1 The supply amount of the material supply device 81 and the like are set based on the resin amount of the shot. Therefore, the supply amount of the material supply device 81 can be set accurately without relying on the user's experience or sensation.

The controller 40 may display on the display unit 46 a confirmation image confirming to the user whether or not the molding operation may be performed at the set supply amount or the like before actually performing the molding operation at the set supply amount or the like. When the user who sees the confirmed image makes a predetermined input in the input unit 45, the molding operation is actually performed at the set supply amount or the like.

In addition, in this embodiment, although the input part 45 and the display part 46 are provided separately, you may provide integrally as a touch panel, for example.

The material supply apparatus 81 may supply resin as a molding material into the cylinder 11 at the time of shaping | molding with the supply amount set by the controller 40. The controller 40 may determine that there is a problem in molding conditions other than the set supply amount, and operate the device that outputs a warning when the weighing process is not finished within the predetermined weighing time at the set supply amount. As the device for outputting a warning, for example, the display unit 46, a warning buzzer, a warning lamp and the like are used. It can call the user's attention.

As mentioned above, although embodiment of the injection molding machine was described, this invention is not limited to the said embodiment, A various deformation | transformation and improvement are possible within the range as described in a claim.

For example, the material supply apparatus of the above embodiment includes a feed screw, but may also include a vacuum loader, and the configuration thereof is not particularly limited.

In addition, although the injection apparatus of the said embodiment rotates the screw 20 and the feed screw 85 synchronously, you may rotate separately. For example, the feed screw 85 may be rotated only in a part of the weighing process (for example, the first half). That is, in the said embodiment, although the supply time and the metering time of the material supply apparatus 81 are the same, they may differ.

Moreover, in the metering process of the said embodiment, although the screw 20 is rotated, applying back pressure to the screw 20, a metering operation is not specifically limited. For example, as in the purge operation, the operation of sending the resin toward the front of the screw 20 by retreating the screw 20 and rotating the screw 20 at a predetermined rotation speed at the retreat completion position is a measurement operation. It may be done. Retraction of the screw 20 is prohibited during the rotation of the screw 20, and the effect of the nutring of the resin, which may occur when the screw 20 is allowed to retreat during the rotation of the screw 20, can be excluded. There is good weighing accuracy.

Moreover, although the injection apparatus of the said embodiment is a screw in-line system, it may be of a screw pre-plastation system. In the screw preplication method, the molten resin is supplied to the injection cylinder by injecting the molten resin into the mold apparatus from the injection cylinder. In the screw preplication method, the screw is disposed in the plasticizing cylinder.

2 Injection Molding Machine
10 Injection device
11 cylinder
20 screws
21 screw body
22 Injection
23 flight part
24 pressure member
26 thread groove
40 Controller (Setting Support Device)
45 input
46 Display
60 drive
61 Weighing Motor
71 Injection Motor
81 Material Feeder
83 feed cylinder
85 feed screws
86 feed motor

Claims (7)

A cylinder for melting the supplied molding material,
A material supply device for supplying molding material into the cylinder;
A screw disposed rotatably and axially retractable in the cylinder,
Equipped with a setting support device for supporting the setting of the injection molding machine,
The setting support apparatus stores the relationship between the supply amount of the material supply device and the flow rate of the molten molding material sent to the space in front of the screw in the cylinder by rotating the screw in the cylinder, An injection molding machine for setting the supply amount of the material supply device at the time of molding based on the stored relationship, the weighing time, and the amount of molding material for one shot. The method of claim 1,
The material supply device includes a feed cylinder and a feed screw rotatably disposed in the feed cylinder to send molding material in the feed cylinder into the cylinder,
The relationship is a relationship between the rotational speed of the feed screw indicating the supply amount of the material supply device and the flow rate,
And the setting support apparatus sets the rotational speed of the feed screw at the time of molding based on the stored relationship, the weighing time, and the amount of molding material for one shot. The method according to claim 1 or 2,
In obtaining the relationship, the flow rate is measured by rotating the screw while applying back pressure to the screw. The method according to claim 1 or 2,
When the relationship is obtained, the flow rate is measured by rotating the screw retracted to a predetermined position at the predetermined position. The method according to claim 1 or 2,
At the time of molding, the screw and the feed screw of the material supply device are rotated in synchronization. The method of claim 5,
When the relationship is obtained, the ratio between the rotational speed of the screw and the rotational speed of the feed screw is the same ratio as that at the time of molding,
The setting support apparatus is configured to set the rotation speed of the feed screw at the time of molding and the rotation speed of the screw at the time of molding, based on the stored relationship, the weighing time, and the amount of molding material for one shot. . The method of claim 5,
When the relationship is found, the rotation speed of the screw is constant,
And the setting support device sets the rotation speed of the screw at the time of molding so that the ratio of the rotation speed of the feed screw at the time of molding is a predetermined ratio.

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