KR20140051066A - Injection molding machine - Google Patents

Abstract

Provided is an injection molding machine for accurately setting the supplying amount of a raw material supplying apparatus. The injection molding machine (2) includes a cylinder (11), a raw material supplying apparatus (81) for supplying a material for molding in the cylinder (11), a screw (20) disposed in the cylinder (11) to rotate and move in a shaft direction, and a setting support apparatus (40) for supporting the setting of the injection molding machine (2). The setting support apparatus (40) memorizes relation between the supplying amount of the raw material supplying apparatus (81) and the flux of the material for molding supplied in front of the screw (20) by rotating the screw (20), and sets the supplying amount of the raw material supplying apparatus 81 during molding based on the memorized relation, measured time period, and the amount of the material for molding for one shot. [Reference numerals] (44) Memory unit; (45) Input unit; (46) Display unit

Description

[0001] INJECTION MOLDING MACHINE [0002]

The present application claims priority based on Japanese Patent Application No. 2012-233106 filed on October 22, 2012. The entire contents of which 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 a resin as a molding material into the cylinder, and a screw rotatably and movably arranged in the cylinder. The resin supplied in the screw groove of the screw by the material supply device is sent forward in accordance with the rotation of the screw, and is gradually melted by 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 is filled in the cavity of the mold apparatus. The filled molten resin is solidified to obtain a molded article (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2004-351661

The supply amount of the material supply device is set by trial and error depending on the experience or the sense of the user, so that the supply amount of the material supply device may not be set accurately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an injection molding machine capable of accurately setting a supply amount of a material supply device.

According to an aspect of the present invention, there is provided an injection molding machine comprising:

A cylinder,

A material supply device for supplying a molding material into the cylinder,

A screw rotatably and axially movably disposed in the cylinder,

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

Wherein the setting support device stores a relationship between a supply amount of the material supply device and a flow rate of a molding material to be fed forward of the screw by rotating the screw, and stores the relationship, the metering time, Based on the amount of the molding material, the supply amount of the material supply device at the time of molding is set.

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

1 is a view showing an injection molding machine according to an embodiment of the present invention.
Fig. 2 is a diagram showing the driving apparatus of Fig. 1;
3 is a diagram showing an example of the relationship between the number of revolutions of the feed screw and the resin flow rate, which represents the feed rate of the material feeding device.
4 is a diagram showing an example of a time variation of the actual back pressure of the screw in the purging operation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and a description thereof will be omitted. Hereinafter, description will be made assuming that the injection direction of the resin is forward and the direction opposite to the injection direction of the resin is the backward direction.

The injection molding machine includes a mold closing process for closing a mold device composed of a stationary mold and a movable mold, a mold clamping process for clamping the mold device, a filling process for introducing the molten resin into the mold device, a holding process for applying pressure to the inflow resin A cooling step for solidifying the resin in the mold apparatus after the holding process, a weighing process for weighing the molten resin for the next molded product, a mold opening process for opening the mold apparatus, and a takeout process for taking out the molded article from the mold apparatus after mold opening To prepare a molded product repeatedly. For shortening the molding cycle, the metering step may be performed during the cooling step.

1 is a view showing an injection molding machine according to an embodiment of the present invention. The injection molding machine (2) has a mold clamping device and an injection device (10). The mold clamping apparatus includes a stationary platen on which a stationary mold is mounted and a movable platen on which the movable mold is mounted. The movable platen is advanced and retreated to bring the movable mold into contact with the stationary mold, Open. The fastening device may be any of a toggle type using an electric motor and a toggle mechanism, a direct 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 (e.g., resin pellets) is supplied, a nozzle 12 disposed at the front end of the cylinder 11, A screw 20 disposed so as to be able to move back and forth in the axial direction, heaters h11 to h13 as a heating source for heating the cylinder 11 and a driving device 60 disposed behind the cylinder 11. [

The screw 20 includes a screw body 21 and an injection part 22 arranged forward of the screw body 21 and is connected to the drive unit 60 through the shaft part 51 at the rear end. The screw body (21) has a flight portion (23) and a pressure member (24) detachably arranged on the front end of the flight portion (23). The flight section 23 is provided with a rod-like main body section 23a and a helical flight 23b protruding from the outer peripheral surface of the main body section 23a. (26) are formed. The depth of the thread groove 26 may be constant or may be constant from the rear end to the front end of the flight portion 23, or the screw compression ratio may be constant.

However, it is also possible to form a flight portion over the entire screw body 21 without arranging the pressure member 24. The screw body 21 has a supply portion through which resin is supplied from the rear end to the front end, A compression section for melting while compressing, and a metering section for metering the melted resin by a predetermined amount. The depth of the thread groove is deeper at the supply portion, shallower at the metering portion, and shallower toward the front in the compression portion.

The injection section 22 includes a head section 31 having a conical section at its tip end, a rod section 32 formed adjacent to the rear of the head section 31, A check ring 34 mounted on the front end of the pressure member 24, and a check ring 34 mounted on the front end of the pressure member 24.

The backflow preventing ring 33 is moved forward from the rear of the injection part 22 when the screw 20 is retracted and the backflow preventing ring 33 is moved forward with respect to the rod part 32, The resin is sent. When the backflow preventing ring 33 is moved rearward with respect to the rod portion 32 and comes into contact with the seal ring 34 in accordance with advancement of the screw 20 during the injection process, do.

A resin supply port 14 serving as a molding material supply port is formed in the vicinity of the rear end of the cylinder 11. The resin supply port 14 is provided so as to allow the screw 20 to be located at the forward limit position in the cylinder 11 And is formed at a position opposite to the rear end of the thread groove 26 in a state where it is left. 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 a molding material (e.g., resin pellets), a feed cylinder 83 extending horizontally from the lower end of the hopper 82, A feed screw 86 which rotates in the feed cylinder 83 and a feed motor 86 which rotates the feed screw 85 and the like are provided . However, the feed cylinder 83 is not necessarily required to extend in the horizontal direction, but may be inclined with respect to the horizontal direction, for example, and the outlet side may be higher than the inlet side.

The resin supplied from the inside of the hopper 82 into the feed cylinder 83 is advanced along the thread groove of the feed screw 85 in accordance with the rotation of the feed screw 85. The resin sent from the front end of the feed screw 85 into the guide portion 84 falls down in the guide portion 84 and is fed into the cylinder 11. [ However, the resin supplied into the feed cylinder 83 may be heated (preheated) by a heater (not shown). At this time, the resin may be preheated to a temperature at which it is not melted, for example, a predetermined temperature equal to or lower than the glass transition point.

2 is a diagram showing the driving apparatus of Fig. The driving device 60 includes a metering motor 61 as a driving source for rotating the screw 20 in the cylinder 11. [ The metering motor 61 may be a servo motor. The metering motor 61 includes a stator 62 fixed to the support frame Fr and a tubular rotor 63 disposed inside the stator 62. [ The spline nut 64 fixed to the rear end of the rotor 63 is spline coupled with the rotating member 65. [ That is, the rotary member 65 is rotatable together with the spline nut 64, and is movable forward and backward with respect to the spline nut 64. The rotating member 65 includes a connecting body 66 connected to the rear end of the shaft portion 51 of the screw 20 through a coupling 52 and a supporting body 67 fixed to the connecting body 66 with bolts or the like, . A spline groove 68 for coupling with the spline nut 64 is formed on the outer periphery of the support 67. The rotation of the weighing motor 61 is transmitted to the shaft portion 51 via the rotary member 65 and the screw 20 is rotated. As a result, the flight 23b of the flight section 23 moves, and the resin fed into the thread groove 26 of the flight section 23 is forward.

The driving device 60 includes an injection motor 71 as a driving 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 tubular output shaft, not shown, and the ball screw shaft 72 is spline-coupled to the output shaft. That is, the ball screw shaft 72 is rotatable together with the output shaft of the injection motor 71, and is movable forward and backward with respect to the output shaft of the injection motor 71. The ball screw nut 73 screwed to the ball screw shaft 72 is fixed to the support frame Fr through the load cell 74. The load cell 74 is disposed between the support frame Fr and the injection motor 71 and detects the back pressure of the screw 20 (the pressure that presses the screw 20 forward). The shaft 75 coaxially extending from the front end of the ball screw shaft 72 is rotatably and non-retractably supported by the rotary member 65 via bearings Br1 and Br2. When the injection motor 71 is driven, the ball screw shaft 72 rotates and advances and the rotary member 65 and the screw 20 are advanced and retreated. The rotation of the rotary member 65 may be stopped by driving the weighing motor 61 so that the screw 20 is not rotated when the screw 20 is advanced or retracted in the filling process. However, the weighing motor 61 may be a motor equipped with a brake, and the rotation of the rotary member 65 may be stopped by the braking force of the brake in the filling process.

However, the drive device 60 may be any one capable of rotating or moving the screw 20 in the cylinder 11, and the structure thereof 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 apparatus 10 and the operation of the material supply apparatus 81) is controlled by the controller 40. [ The controller 40 includes a CPU 41, a ROM 42 for storing control programs and the like, a readable RAM 43 for storing calculation results and the like, a storage unit 44 such as a hard disk, An interface, a timer, and a counter. The controller 40 realizes various functions by causing the CPU 41 to execute a program stored in the ROM 42 or the storage unit 44 or the like.

In the metering step, the metering motor 61 is driven and the screw 20 is rotated. 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 synchronously at the time of molding. A current is supplied to the feed motor 86 so that the current is supplied to the weighing motor 61 so that the number of revolutions of the screw 20 is the set rotation number and the number of revolutions of the feed screw 85 is the set rotation number.

The set rotation speed of the screw 20 and the set rotation speed of the feed screw 85 need to be constant, 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 needs to be constant.

The set rotation speed of the screw 20 and the set rotation speed of the feed screw 85 may be changed in accordance with the position of the screw 20 or the elapsed time from the start of the weighing. The synchronization rate may be changed in accordance with the position of the screw 20, the elapsed time from the start of measurement, 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 in accordance with the rotation of the feed screw 85. The resin sent from the front end of the feed screw into the guide portion 84 falls down in the guide portion 84 and is fed into the cylinder 11. [

The resin supplied into the cylinder 11 may be immediately sent forward by the screw 20 without staying in the resin supply port 14. [ As a result, the 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 (starved state). Therefore, as the supply speed of the resin by the material supply device 81 is increased, the amount of resin sent forward per unit time by the screw 20 is increased.

The resin supplied into the cylinder 11 advances 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. The resin is gradually pressed from the pressure rising start position of the resin in the screw body 21 to the front end of the screw body 21. The pressure rising start position is located a predetermined distance backward from the pressure member 24 and varies depending on the ratio of the number of revolutions of the screw 20 to the number of revolutions of the feed screw 85 do. When there is a pressure rising start position at a distance within a 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 is kneaded therebetween, Passes through the resin flow path between the screw 32 and the front side of the screw 20, and is accumulated in the front portion of the cylinder. 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 a back pressure to the screw 20, thereby suppressing the abrupt 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. A 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 is retracted to the metering completion position and a predetermined amount of resin is accumulated in front of the screw 20, the driving of the metering motor 61 is stopped to stop the rotation of the screw 20, Is completed. The driving of the feed motor 86 may be stopped and the rotation of the feed screw 85 may be stopped simultaneously with the completion of the metering process.

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 die-clamping mold apparatus. The pressure (resin filling pressure) that the screw 20 presses the resin forward is detected as a reaction force by the load cell 74. Since the resin filled in the cavity space is contracted by cooling, the injection motor 71 is supplied with the electric current so that the fill pressure of the resin becomes the set pressure in the pressure holding step in order to replenish the resin of the shrinkage.

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

The supply amount of the material supply device 81 at the time of molding is determined so that the same amount of resin as one shot is delivered to the front of the screw 20 at a predetermined metering time. This feed rate is 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 synchronously, and when the weighing time is determined, the supply time is automatically determined. The feeding speed is proportional to the number of revolutions of the feed screw 85. Therefore, the number of rotations of the feed screw 85 indicating the feed amount may be determined.

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

The controller 40 as the setting support apparatus controls the 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 Hereinafter simply referred to as "resin flow rate"). The above relationship is stored in the ROM 42 or the storage unit 44, for example, in the form of an expression or the like.

The controller 40 sets the number of rotations of the feed screw 85 indicating the feed amount of the material supply device 81 based on the stored relationship, the metering time, and the resin amount for one shot. The various data used in this setting (for example, the data of the relationship, the weighing time, the amount of resin for one shot, and the like) are input to the controller 40 through the input unit 45 that accepts the input operation of the user And the data stored in the ROM 42 or the storage unit 24 may be used. The resin amount (mm ³ ) of one shot is calculated on the basis of the retraction distance of the screw 20 in the metering step and the inner diameter of the cylinder 11 (outer diameter of the screw 20).

Fig. 3 is a diagram showing an example of the relationship between the number of revolutions of the feed screw and the resin flow rate, which shows the feed rate of the material feeding device. Fig. As shown in Fig. 3, the above relationship can be approximated by a formula such as a first-order linear equation and the resin flow rate (mm ³ / s) increases in proportion to the revolution number (rpm) of the feed screw 85. The controller 40 controls the rotation speed of the feed screw 85 at the time of molding so that the value obtained by dividing the resin amount (mm ³ ) of one shot minute by the resin flow rate (mm ³ / s) becomes the predetermined metering time (s) (rpm).

The above relationship may be measured at the time of purge operation. The purging operation is an operation for stabilizing the molten state of the resin in the cylinder 11 before the start of molding, supplying resin into the cylinder 11 and discharging the supplied resin. The purging operation is carried out in a state in which the nozzle 12 is spaced apart from the mold apparatus, and the resin is not charged in the mold apparatus, and there is no trouble to take out the solidified resin from the mold apparatus. Since the purging operation is performed before the start of molding, the above relationship can be measured before the start of molding.

There are a plurality of types of purge operations, but the screw 20 may be rotated while applying back pressure to the screw 20, for example, in the same manner as in the metering step. As the resin is sent to the front of the screw 20 and accumulated in the cylinder front portion, the screw 20 is retracted. Thereafter, 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.

The resin flow rate (mm ³ / s) is measured by rotating the screw 20 while applying a back pressure to the screw 20, and the flow rate of the resin sent to the front of the screw 20 Is calculated by dividing the amount (mm ³ ) by the rotation time (s) of the screw 20. The amount of the resin (mm ³ ) fed forward of the screw 20 is the same as the amount of change in the volume of the space formed in front of the screw 13 in the cylinder 11, The retraction amount of the screw 20, and the like.

By the way, the resin is fixed to the inner wall of the cylinder 11 by friction, so that the resin may become a nut. When the screw 20 rotates with respect to the nested resin, the screw 20 is retracted even though the resin is not sent forward of the screw 20.

Therefore, as another purging operation, the screw 20 retracted to a predetermined position may be rotated at a predetermined position, which will be described in detail later. Hereinafter, this purging operation will be described in detail.

The controller 40 drives the injection motor 71 to retreat the screw 20 first. During retraction of the screw 20, the screw 20 may not be rotated. While the screw 20 is retracted, 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 ) of the screw 20 is determined based on the retraction distance (mm) of the screw 20 and the inner diameter (outer diameter of the screw 20) .

Next, the controller 40 drives the metering motor 61 to rotate the screw 20 at a predetermined number of revolutions to send the resin to the front of the screw 20. At this time, the controller 40 may drive the injection motor 71 to inhibit the screw 20 from moving back and forth. At this time, the controller 40 may drive the feed motor 86 to rotate the feed screw 85, or the screw 20 and the feed screw 85 may rotate synchronously.

However, in this embodiment, when the injection motor 71 is driven in order to prohibit the screw 20 from moving back and forth, and when the injection motor 71 is equipped with the brake, the braking force of the brake causes the screw 20 to move forward and backward It may be prohibited.

The resin is sent to the front of the screw 20 in accordance with the rotation of the screw 20 and the resin is accumulated in the space formed in the cylinder 11 before the rotation of the screw 20 is started. Until this space is filled with resin, the back pressure of the screw 20 hardly fluctuates. When this space is filled with resin, the back pressure of the screw 20 starts to rise sharply.

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

4, when the screw 20 starts rotating at time t1, the back pressure of the screw 20 hardly fluctuates until the space is filled with the resin, and when 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 becomes higher to some extent, the resin is discharged from the nozzle 12, so that the back pressure of the screw 20 becomes constant.

When the above relationship is found during the purging operation, the resin flow rate is measured by rotating the screw 20 retracted to a predetermined position at the predetermined position. It is possible to eliminate the influence of the nuts of the resin which may occur when the screw 20 is inhibited from advancing and retreating during the rotation of the screw 20 and the screw 20 is allowed to retract during the rotation of the screw 20 Therefore, the measurement accuracy of the resin flow rate is good.

The controller 40 determines the time T (s) from the start of rotation of the screw 20 to the time when the back pressure of the screw 20 reaches a predetermined value and divides the volume (mm ³ ) (mm ³ / s). The volume (mm ³ ) of the space is equal to the amount of the resin sent forward of the screw 20 during the time T. The time (T) is measured by a timer of the controller (40).

The backward completion position of the screw 20 in the purging operation may be a position substantially equal to the metering completion position. In this case, from the start of rotation of the screw 20, the back pressure of the screw 20 is set to a predetermined value The time T until the time T becomes substantially equal to the metering time. The resin flow rate can be measured under substantially the same conditions as the metering process.

However, the retreat completion position of the screw 20 is not necessarily the same position as the weighing completion position, and is not particularly limited. It is possible to calculate the resin flow rate regardless of the retreat distance of the screw 20.

The controller 40 may calculate the resin flow rate when the revolution number of the feed screw 85 is changed so as to obtain the above relationship and calculate a plurality of resin flow rates .

The relationship between the number of revolutions of the screw 20 and the number of revolutions of the feed screw 85 is the same as that at the time of molding, 20 may be changed. The controller 40 calculates the number of revolutions of the feed screw 85 at the time of molding and the number of revolutions of the screw 20 at the time of molding based on the stored relationship, the metering time, and the amount of molding material for one shot, . Therefore, the pressure rising start position of the resin can be set to a desired position, the molten state of the resin is stabilized, and the weight of the molded article is stabilized.

However, in obtaining the above relationship, the number of revolutions of the screw 20 may not be changed in accordance with the change in the number of revolutions of the feed screw 85, and the number of revolutions of the screw may be constant. That is, the ratio of the number of revolutions of the screw 20 to the number of revolutions of the feed screw 85 may not be constant when calculating the above relationship. In this case, the controller 40 sets the number of revolutions of the feed screw 85 at the time of molding based on the above relationship and the like, and then sets the ratio of the number of revolutions of the feed screw 85 at the time of molding to a predetermined ratio The number of revolutions of the screw 20 at the time of molding may be set.

Thus, 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 stores the stored relationship, the metering time, The supply amount of the material supply device 81 and the like are set based on the resin amount of the shot material. Therefore, the supply amount of the material supply device 81 can be accurately set without depending on the experience or the sense of the user.

The controller 40 may display on the display unit 46 a confirmation image for confirming to the user whether or not the molding operation can be performed with the set supply amount or the like before the molding operation is actually performed with the set supply amount or the like. When the user who has viewed the confirmation image performs a predetermined input at the input unit 45, the molding operation is actually performed with the set supply amount or the like.

However, in the present embodiment, the input unit 45 and the display unit 46 are separately provided, but they may be integrally provided as, for example, a touch panel.

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

Although the embodiment of the injection molding machine has been described above, the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope of the claims.

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

In the injection apparatus of the above-described embodiment, the screw 20 and the feed screw 85 are rotated synchronously, but may be rotated 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 above embodiment, the supply time of the material supply device 81 and the metering time are the same, but they may be different.

In the weighing process of the above embodiment, the screw 20 is rotated while applying the back pressure to the screw 20, but the weighing operation is not particularly limited. For example, as in the purge operation, an operation of retracting the screw 20 and rotating the screw 20 at a predetermined number of revolutions at the retreat completion position to forward the resin to the screw 20 is referred to as a metering operation It may be done. It is possible to eliminate the influence of the nuts of the resin which may occur when the screw 20 is inhibited from advancing and retreating during the rotation of the screw 20 and the screw 20 is allowed to retract during the rotation of the screw 20 Weighing precision is good.

The injection apparatus of the above-described embodiment is a screw-in-line system, but it may be a screw-free plasticization system. In the screw preplastication system, molten resin is supplied to the injection cylinder in the plasticizing cylinder, and molten resin is injected from the injection cylinder into the mold apparatus. In the screw preplastication system, a screw is disposed in the plasticizing cylinder.

2 Injection molding machine
10 Injection device
11 cylinders
20 Screw
21 Screw body
22 Injection section
23 flight part
24 pressure member
26 thread groove
40 controller (configurable devices)
45 input unit
46 Display
60 drive
61 Weighing motor
71 Injection motor
81 Material Feeder
83 Feed cylinder
85 Feed Screw
86 Feed motor

Claims (7)

A cylinder,
A material supply device for supplying a molding material into the cylinder,
A screw rotatably and axially movably disposed in the cylinder,
And a setting support device for supporting the setting of the injection molding machine,
Wherein the setting support device stores a relationship between a supply amount of the material supply device and a flow rate of a molding material to be fed forward of the screw by rotating the screw, and stores the relationship, the metering time, And sets the supply amount of the material supply device at the time of molding based on the amount of the molding material. The method according to claim 1,
Wherein the material supply device includes a feed cylinder and a feed screw rotatably disposed in the feed cylinder for feeding molding material in the feed cylinder into the cylinder,
Wherein the relationship is a relationship between the number of revolutions of the feed screw indicating the supply amount of the material supply device and the flow rate,
Wherein the setting support device sets the number of revolutions of the feed screw at the time of molding based on the stored relationship, the metering time, and the amount of molding material for one shot. 3. The method according to claim 1 or 2,
Wherein the flow rate is measured by rotating the screw while applying a back pressure to the screw. 3. The method according to claim 1 or 2,
Wherein the flow rate is measured by rotating the screw which has been moved back to a predetermined position at the predetermined position. 3. The method according to claim 1 or 2,
Wherein, during molding, the screw and the feed screw of the material supply device are rotated synchronously. 6. The method of claim 5,
The ratio of the number of revolutions of the screw to the number of revolutions of the feed screw is the same as that at the time of molding,
Wherein the setting support device is configured to set the number of revolutions of the feed screw at the time of molding and the number of revolutions of the screw at the time of molding based on the stored relationship, the metering time, and the amount of molding material for one shot, . 6. The method of claim 5,
When the relationship is obtained, the number of revolutions of the screw is constant,
Wherein the setting support device sets the number of revolutions of the screw at the time of molding so that a ratio of the number of revolutions of the feed screw at the time of molding to a predetermined ratio becomes a predetermined ratio.

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