TW201416215A - Injection molding machine - Google Patents

Abstract

The present invention provides an injection molding machine capable of precisely setting a supply amount of a material supply device. The injection molding machine (2) of the present invention comprises: a pressure cylinder (11); a material supply device (81) for supplying a molding material into the pressure cylinder (11); a screw (20) rotatably disposed in the pressure cylinder (11) and movable in an axial direction; a setting support device (40) for supporting the setting of the injection molding machine (2). The setting support device (40) memorizes the relationship between the supply amount of the material supply device (81) and the molding material flow sent to the front of the screw (20) by the rotation of the screw (20), and based on the memorized relationship, measurement time, and the amount of molding material of one injection, sets the supply amount of the material supply device (81).

Description

Injection molding machine

The present invention relates to an injection molding machine.

The injection molding machine includes a pressure cylinder, a material supply device that supplies a resin as a molding material into the cylinder, and a screw that is disposed to be rotatable in the cylinder and freely retractable. The resin supplied into the screw groove of the screw by the material supply device is sent forward along with the rotation of the screw, and is gradually melted by heat or the like from the pressure cylinder. As the molten resin is sent to the front of the screw and accumulated in the front of the cylinder, the screw will retreat. Then, when the screw is advanced, the molten resin accumulated in front of the screw is ejected from the nozzle formed at the tip end portion of the cylinder, and is filled in the cavity space of the mold device. A molded article is obtained by curing the filled molten resin (for example, see Patent Document 1).

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2004-351661

The supply amount of the material supply device is set by the user's experience or intuition, and sometimes it cannot be accurately set.

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

In order to solve the above problems, an injection molding machine according to the present invention includes a pressure cylinder, a material supply device that supplies a molding material into the cylinder, and is disposed to be freely movable in the axial direction of the cylinder. a screw; and a setting support device that supports the setting of the injection molding machine, The supply amount of the material supply device is stored in the relationship between the supply amount of the material supply device and the flow rate of the molding material sent to the front side of the screw by the rotation of the screw, and based on the stored relationship, the measurement time, and the 1st shot. The amount of the molding material is set to the amount of supply of the material supply device at the time of molding.

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

2‧‧‧ Injection molding machine

10‧‧‧Injection device

11‧‧‧Cylinder

20‧‧‧ screw

21‧‧‧ Screw body

22‧‧‧ shot out

23‧‧‧Threading Department

24‧‧‧ Pressure components

26‧‧‧Thread groove

40‧‧‧ Controller (setting support device)

45‧‧‧ Input Department

46‧‧‧Display Department

60‧‧‧ drive

61‧‧‧Measurement motor

71‧‧‧Injection motor

81‧‧‧Material supply device

83‧‧‧feed cylinder

85‧‧‧feed screw

86‧‧‧Feed motor

Fig. 1 is a schematic view showing an injection molding machine according to an embodiment of the present invention.

Fig. 2 is a schematic view of the driving device of Fig. 1.

Fig. 3 is a view showing an example of the relationship between the number of rotations of the feed screw and the resin flow rate, which indicates the supply amount of the material supply device.

Fig. 4 is a view showing an example of temporal changes in the actual back pressure of the screw during the purifying operation.

Hereinafter, embodiments for carrying out the invention will be described with reference to the accompanying drawings. In the respective drawings, the same or corresponding components are designated by the same or corresponding components, and the description is omitted. Hereinafter, the direction in which the resin is emitted is set to the front, and the direction opposite to the direction in which the resin is emitted is set to the rear.

The injection molding machine repetitively manufactures a molded article as a cycle by closing a mold closing process of a mold device composed of a fixed mold and a movable mold; a mold clamping process for fastening the mold device; and filling the molten resin into the mold device. Process; a compression process for applying pressure to the resin to be poured; a cooling process for curing the resin in the mold device after the pressing process; measuring a measurement process for the molten resin of the next molded article; opening the mold opening process of the mold device and The extrusion process of the molded article is pushed out from the mold device after the mold is opened. To shorten the forming cycle, the measurement process can also be performed during the cooling process.

Fig. 1 is a schematic 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 device has a fixed pressure plate mounted with a fixed mold and a movable mold mounted thereon The pressure plate performs mold closing, mold clamping, and mold opening by bringing the movable platen forward and backward to bring the movable mold into contact with and separate from the fixed mold. The mold clamping device may be any one of a toggle type using an electric motor and a toggle mechanism, a direct pressure type using a fluid pressure cylinder, and an electromagnetic type using a linear motor and an electromagnet, and the method is not particularly limited.

The injection device 10 includes a cylinder 11 to which a molding material (for example, resin pellets) is supplied, a nozzle 12 disposed at a front end of the cylinder 11, and a nozzle that is rotatably and reciprocally movable in the axial direction. The screw 20; the heaters h11 to h13 serving as heating sources for heating the cylinders 11; and the driving device 60 disposed at the rear of the cylinders 11.

The screw 20 includes a screw main body 21 and an injection portion 22 disposed forward of the screw main body 21, and is coupled to the driving device 60 via a shaft portion 51 at the rear end. The screw main body 21 includes a spiral portion 23 and a pressure member 24 that is detachably disposed at the front end of the spiral portion 23 . The spiral portion 23 includes a rod-shaped main body portion 23a and a spiral thread 23b projecting from the outer peripheral surface of the main body portion 23a, and a spiral screw groove 26 is formed along the screw thread 23b. From the rear end to the front end of the spiral portion 23, the depth of the thread groove 26 can be constant, or the screw compression ratio can be constant.

Further, the spiral member may be formed on the entire screw main body 21 without providing the pressure member 24, and the screw main body 21 may be divided into a supply portion for supplying resin from the rear end to the front end: the resin to be supplied is compressed while being compressed. And a measuring unit that measures the molten resin at a certain amount each time. The depth of the thread groove is deep in the supply portion, is shallow in the measurement portion, and is shallower toward the front in the compression portion.

The injection portion 22 includes a head portion 31 having a conical portion at the tip end, a rod portion 32 formed adjacent to the rear side of the head portion 31, an anti-backflow ring 33 disposed around the rod portion 32, and a pressure member attached thereto. Sealing ring (locking ring) 34 at the front end of 24.

In the measurement process, as the anti-backflow ring 33 moves forward with respect to the rod portion 32 as the screw 20 retreats, and away from the seal ring 34, the resin is sent forward from the rear of the injection portion 22. Further, in the injection process, as the anti-backflow ring 33 moves rearward with respect to the rod portion 32 and advances against the seal ring 34 as the screw 20 advances, backflow of the resin can be prevented.

A resin supply port 14 as a molding material supply port is formed in the vicinity of the rear end of the cylinder 11, and the resin supply port 14 is formed in the screw groove 26 in a state where the screw 20 is placed at the forward limit position in the cylinder 11. The rear end portion is opposite to the portion. A material supply device 81 that supplies resin into the cylinder 11 is attached to the resin supply port 14.

The material supply device 81 includes a hopper 82 that houses a molding material (for example, resin pellets), a feed cylinder 83 that extends in the horizontal direction from the lower end of the hopper 82, and a cylindrical guide that extends downward from the front end of the feed cylinder 83. The lead portion 84 is provided with a feed screw 85 that is rotatable in the feed cylinder 83, a feed motor 86 that rotates the feed screw 85, and the like. Further, the feed cylinder 83 does not need to necessarily extend in the horizontal direction, and may extend obliquely 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 advances along the thread groove of the feed screw 85 in accordance with the rotation of the feed screw 85. The resin fed into the guide portion 84 from the front end of the feed screw 85 is dropped in the guide portion 84. It is supplied to the cylinder 11. Further, 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 that does not melt, such as a predetermined temperature below the glass transition point.

Fig. 2 is a schematic view of the driving device of Fig. 1. The drive unit 60 includes a measurement motor 61 as a drive source for rotating the screw 20 in the cylinder 11. The measurement motor 61 can be a servo motor. The measurement motor 61 includes a stator 62 fixed to the support frame Fr and a cylindrical rotor 63 disposed inside the stator 62. A spline nut 64 fixed to the rear end of the rotor 63 is spline-coupled to the rotating member 65. That is, the rotating member 65 is rotatable together with the spline nut 64 and is retractable with respect to the spline nut 64. The rotating member 65 includes a connecting body 66 that is coupled to the rear end of the shaft portion 51 of the screw 20 via the coupling 52, and a support body 67 that is fixed to the connecting body 66 by bolts or the like. A spline groove 68 for coupling with the spline nut 64 is formed on the outer circumference of the support body 67. The rotation of the measurement motor 61 is transmitted to the shaft portion 51 via the rotating member 65 to rotate the screw 20 . As a result, the screw 23b of the spiral portion 23 operates, and the resin supplied into the screw groove 26 of the spiral portion 23 is sent forward.

The drive unit 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 can be a servo motor. The injection motor 71 has a cylindrical 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 retractable with respect to the output shaft of the injection motor 71. Ball screw nut screwed to the ball screw shaft 72 73 is fixed to the support frame Fr via the force sensor 74. The force sensor 74 is disposed between the support frame Fr and the injection motor 71, and detects the back pressure of the screw 20 (the pressure of the screw 20 pushed forward). The shaft 75 coaxially extending from the front end of the ball screw shaft 72 is rotatably supported by the rotating member 65 via the bearings Br1 and Br2 and cannot advance and retreat. When the injection motor 71 is driven, the ball screw shaft 72 advances and retracts while rotating, and the rotating member 65 and the screw 20 advance and retreat. When the screw 20 advances and retracts during the filling process, the measuring motor 61 can be driven to stop the rotation of the rotating member 65 to prevent the screw 20 from rotating. Further, the measurement motor 61 may be a motor with a brake, and the rotation of the rotating member 65 may be stopped by the braking force of the brake during the filling process.

Further, the drive unit 60 may rotate or advance the screw 20 in the cylinder 11, and the configuration thereof is not limited to the configuration of Fig. 2 .

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 and the operation of the material supply device 81) is controlled by the controller 40. The controller 40 includes a CPU 41, a ROM 42 that stores a control program, and the like, a readable and writable RAM 43 that stores calculation results, a memory unit 44 such as a hard disk, an input interface, an output interface, a timer, and a counter. The controller 40 realizes various functions by executing a program stored in the ROM 42 or the memory 44 or the like by the CPU 41.

In the measurement process, the measurement motor 61 is driven to rotate the screw 20. At this time, the feed motor 86 can be driven to rotate the feed screw 85, or the screw 20 and the feed screw 85 can be rotated in synchronization during molding. Supplying a current to the measurement motor 61 so that the rotation speed of the screw 20 becomes the set rotation speed, and A current is supplied to the feed motor 86 so that the number of revolutions of the feed screw 85 becomes the set number of revolutions.

The set rotational speed of the screw 20 and the set rotational speed of the feed screw 85 can be respectively constant. That is, the ratio (synchronization rate) of the set rotation speed of the screw 20 to the set rotation speed of the feed screw 85 may be constant.

Further, the set rotation speed of the screw 20 and the set rotation speed of the feed screw 85 may be changed depending on the position of the screw 20 and the elapsed time from the start of measurement, and the like, respectively. Further, the synchronization rate may be changed depending on the position of the screw 20 and the elapsed time from the start of measurement.

The resin supplied from the hopper 82 into the feed cylinder 83 advances along the thread groove of the feed screw 85 in accordance with the rotation of the feed screw 85. The resin fed into the guide portion 84 from the tip end of the feed screw is dropped into the guide portion 84 and supplied to the cylinder 11.

The resin supplied into the pressure cylinder 11 can be directly sent to the front by the screw 20 without staying at the resin supply port 14. Therefore, the resin is not tightly packed in the screw groove 26 of the screw 20, and the state of the resin in the screw groove 26 is in a sparse state (starved state). Therefore, the faster the supply speed of the resin by the material supply device 81, the greater the amount of resin that is sent forward by the screw 20 per unit time.

The resin supplied into the cylinder 11 advances along the screw groove 26 of the screw 20 with the rotation of the screw 20, and is heated by the heaters h11 to h13 to be melted. Further, the resin is gradually pressurized from the pressure rising start position of the resin of the screw main body 21 to the front end of the screw main body 21. The pressure rise start position is only a position away from the pressure member 24 to the rear away from the predetermined distance, and The displacement is caused by the ratio of the rotation speed of the screw 20 to the rotation speed of the feed screw 85 (synchronization rate) or the like. When there is a pressure rise start position from the distance of the pressure member 24 within a predetermined range, the molten state of the resin is stabilized, and the weight of the molded article is also stabilized.

The resin which advances along the thread groove 26 of the screw 20 passes through the resin flow path between the pressure member 24 and the cylinder 11 and is mixed therebetween, and passes through the resin flow path between the cylinder 11 and the rod portion 32. The vehicle is advanced and sent to the front of the screw 20 to be 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 measurement process, the injection motor 71 is driven to apply a back pressure to the screw 20, thereby suppressing the sharp retreat of the screw 20. Thereby, the kneadability of the resin is improved, and the gas in the resin is easily released 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 the screw 20 is being retracted, the controller 40 monitors the position of the screw 20 with a position sensor (not shown). When the screw 20 is retracted to the measurement end position of the screw 20 and a predetermined amount of resin is accumulated in front of the screw 20, the driving of the measurement motor 61 is stopped, and the rotation of the screw 20 is stopped, and the measurement process is completed. At the same time as the end of the measurement process, the driving of the feed motor 86 can be stopped, and the rotation of the feed screw 85 can be stopped.

In the filling process, the injection motor 71 is driven to advance the screw 20, 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 pushes the resin forward (the filling pressure of the resin) is detected as a reaction force by the force sensor 74. The resin filled in the cavity space shrinks due to cooling, so in order to replenish the shrinkage amount of the resin, during the pressurization process, A current is supplied to the injection motor 71 so that the filling pressure of the resin becomes the set pressure.

However, the user or the like determines the measurement time (rotation time of the screw 20) before the start of molding. In order to shorten the forming cycle, the measurement time can be determined according to the cooling time so that the measurement process is performed during the cooling process. The measurement time can also be set such that the measurement process and the cooling process are substantially simultaneously completed.

The supply amount of the material supply device 81 at the time of molding is determined such that the amount of resin equivalent to the amount of one shot is sent to the front of the screw 20 within the determined measurement time. This supply amount is expressed by the product of the supply speed and the supply time. When the screw 20 and the feed screw 85 rotate in synchronization, the supply time is equal to the measurement time, and when the measurement time is determined, the supply time is also automatically determined. The supply speed is proportional to the rotational speed of the feed screw 85. Therefore, the rotational speed of the feed screw 85 indicating the supply amount can be determined.

In the present embodiment, the controller 40 functions as a function of the setting support device that supports the setting of the injection molding machine 2. Further, the setting support device may be provided separately from the controller 60 that controls the operation of the injection device 10 or the operation of the material supply device 81.

The number of rotations 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, simply referred to as "resin") The relationship of the traffic ") is memorized. The above relationship is stored in the ROM 42, the memory unit 44, and the like in the form of, for example, a formula.

The controller 40 sets the number of rotations of the feed screw 85 indicating the supply amount of the material supply device 81 in accordance with the stored relationship, the measurement time, and the amount of resin of one shot amount. Various materials used in the setting (for example, data of the above relationship, measurement time, amount of resin of one shot amount, and the like) may be input to the controller 40 via the input unit 45 that receives an input operation of the user, or may use memory. Information such as the ROM 42 or the memory unit 24. The amount of resin (mm ³ ) of the amount of injection is calculated based on the retreat distance of the screw 20 in the measurement process, the inner diameter of the cylinder 11 (the outer diameter of the screw 20), and the like.

Fig. 3 is a view showing an example of the relationship between the number of rotations of the feed screw and the resin flow rate, which indicates the supply amount of the material supply device. As shown in Fig. 3, the above relationship can also be roughly expressed by a mathematical formula such as a first-order linear equation, and the resin flow rate (mm ³ /s) is increased in proportion to the rotational speed (rpm) of the feed screw 85. The controller 40 sets the rotation speed (rpm) of the feed screw 85 at the time of molding to a resin amount (mm ³ ) of the amount of injection divided by the value of the resin flow rate (mm ³ /s) to be a predetermined measurement time (s). .

The above relationship can also be measured during the purifying operation. The purifying operation is an operation for stabilizing the molten state of the resin in the cylinder 11 before the start of the forming, and is an operation of supplying the resin into the cylinder 11 and discharging the supplied resin. The purging operation is performed in a state where the nozzle 12 is separated from the mold device, and the resin is not filled in the mold device, so that it is not necessary to take out the cured resin from the mold device in a time-consuming manner. Further, since the purifying operation is performed before the start of the forming, the above relationship can be measured before the start of the forming.

Although there are a plurality of types of purification operations, for example, the same as the measurement process, the screw 20 can be rotated while applying a back pressure to the screw 20. As the resin is sent to the front of the screw 20 and accumulated in the front portion of the cylinder, the screw 20 is retracted. Then, if the screw 20 advances, the melt accumulated in front of the screw 20 The resin is discharged from the nozzle 12 formed at the front end of the cylinder 11.

When the above relationship is required in the purification operation, 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 resin sent to the front of the screw 20 is measured. The amount (mm ³ ) is divided by the rotation time (s) of the screw 20 to be calculated. The amount of the 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 the front of the screw 13 in the cylinder 11 , depending on the inner diameter of the cylinder 11 and the amount of retraction of the screw 20 . Calculation.

However, the resin may be fixed to the inner wall of the cylinder 11 by friction to cause the resin to be nutted. When the screw 20 rotates relative to the nut resin, the resin cannot be sent to the front of the screw 20, but the screw 20 retreats.

Therefore, the details of the other purging operation will be described later, but the screw 20 that has retreated to a predetermined position may be rotated at the predetermined position. Hereinafter, the purification operation will be described in detail.

The controller 40 first drives the injection motor 71 to retract the screw 20. During the retraction of the screw 20, the screw 20 may not rotate. While the screw 20 is being 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 its volume (mm ³ ) is calculated in accordance with the retracted distance (mm) of the screw 20, the inner diameter of the cylinder 11 (the outer diameter of the screw 20), and the like.

Next, the controller 40 drives the measurement motor 61 to rotate the screw 20 at a predetermined number of rotations to send the resin to the front of the screw 20. At this time, in order The advancement and retreat of the screw 20 is prohibited, and the controller 40 can also drive the injection motor 71. Further, at this time, the controller 40 can drive the feed motor 86 to rotate the feed screw 85, or rotate the screw 20 in synchronization with the feed screw 85.

Further, in the present embodiment, in order to prohibit the advancement and retreat of the screw 20, the injection motor 71 is driven. However, when the injection motor 71 is provided with a brake, the advancement and retraction of the screw 20 can be prohibited by the braking force of the brake.

As the screw 20 rotates, the resin is sent to the front of the screw 20, and resin is accumulated in the space formed in the cylinder 11 before the start of the rotation of the screw 20. When the space is filled with the resin, the back pressure of the screw 20 hardly changes, and if the space is filled with the resin, the back pressure of the screw 20 starts to rise sharply.

Fig. 4 is a view showing an example of temporal changes in the actual back pressure of the screw during the purifying operation. Fig. 4 shows the temporal change of the back pressure from the start of the rotation of the screw 20.

As shown in Fig. 4, when the screw 20 starts to rotate at time t1, the back pressure of the screw 20 hardly changes until the space is filled with the resin, and if the space is filled with the resin, the back pressure of the screw 20 starts. increase rapidly. If the back pressure of the screw 20 rises to a certain extent, since the resin is discharged from the nozzle 12, the back pressure of the screw 20 becomes constant soon.

When the above relationship is required in the purging operation, the resin flow rate is measured by rotating the screw 20 that has retreated to a predetermined position at the predetermined position. In the rotation of the screw 20, the advancement and retreat of the screw 20 is prohibited, so that the influence of the nutring of the resin which may occur when the screw 20 is retracted during the rotation of the screw 20 can be eliminated, and the measurement of the resin flow rate is excellent. it is good.

The controller 40 calculates the resin flow rate (mm ³ /s) by dividing the volume (mm ³ ) of the above space by the time T(s) from the rotation of the screw 20 until the back pressure of the screw 20 reaches a predetermined value. The volume (mm ³ ) of the above space is equal to the amount of resin sent to the front of the screw 20 during the time T. Time T is measured by the timer of controller 40.

The retraction end position of the screw 20 during the purging operation may be substantially the same as the measurement end position. At this time, the time T from the start of the rotation of the screw 20 until the back pressure of the screw 20 reaches a predetermined value is approximately the measurement time. the same. The resin flow rate can be measured under substantially the same conditions as the measurement process.

Further, the retracted end position of the screw 20 may not be substantially the same as the measurement end position, and is not particularly limited. The resin flow rate can be calculated irrespective of the retraction distance of the screw 20.

In order to obtain the above relationship, the controller 40 can calculate the resin flow rate when the number of rotations of the feed screw 85 is changed, and calculate a plurality of resin flow rates corresponding to the number of rotations of the plurality of feed screws 85.

When the above relationship is required, the rotation speed of the screw 20 can be changed in accordance with the change in the rotation speed of the feed screw 85 so that the ratio of the rotation speed of the screw 20 to the rotation speed of the feed screw 85 becomes the same ratio as that at the time of molding. The controller 40 can set the number of rotations of the feed screw 85 at the time of molding and the number of rotations of the screw 20 at the time of molding in accordance with the relationship of the memory, the measurement time, and the amount of the molding material of one shot amount. Therefore, the pressure rise start position of the resin can be set at a desired position, and the molten state of the resin is stabilized. The weight of the molded article is also stabilized.

Further, when the above relationship is required, the number of revolutions of the screw 20 may 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, when the above relationship is required, the ratio of the number of revolutions of the screw 20 to the number of revolutions of the feed screw 85 need not be constant. At this time, the controller 40 sets the rotation speed of the feed screw 85 at the time of molding according to the above-described relationship, and then sets the rotation speed of the screw 20 at the time of molding to a predetermined ratio with the rotation speed of the feed screw 85 at the time of molding. proportion.

In this way, the controller 40 memorizes the relationship between the supply amount of the material supply device 81 (for example, the rotational speed of the feed screw 85) and the resin flow rate, and based on the relationship of the memory, the measurement time, and the amount of the resin in the 1 injection amount. The supply amount of the material supply device 81 is set. Therefore, it is possible to accurately set the supply amount of the material supply device 81 without relying on the user's experience or intuition.

The controller 40 may display a confirmation image indicating whether or not the forming operation can be performed by the set supply amount or the like on the display unit 46 before actually performing the forming operation by the set supply amount or the like. When the user who has observed the confirmation image performs a predetermined input on the input unit 45, the molding operation can be actually performed using the set supply amount or the like.

Further, in the present embodiment, the input unit 45 is provided separately from the display unit 46, but may be integrally provided as a touch panel, for example.

The material supply device 81 may be supplied with a resin as a molding material into the cylinder 11 at the time of molding by the supply amount set by the controller 40. The measurement process fails to end within the predetermined measurement time by the set supply amount. At this time, the controller 40 may also determine that there is a problem with the molding conditions other than the set supply amount, and operate the device that outputs the warning. As the means for outputting the warning, for example, the display unit 46, the warning buzzer, the warning light, and the like can be used. Can evoke the attention of the user.

Although the embodiment of the injection molding machine has been described above, the present invention is not limited to the above 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 include a vacuum loader, and the structure thereof is not particularly limited.

Further, in the injection device of the above embodiment, the screw 20 and the feed screw 85 are rotated in synchronization, but they may be rotated separately. For example, the feed screw 85 can be rotated only in a portion of the measurement process (e.g., the first half). That is, in the above embodiment, the supply time of the material supply device 81 is the same as the measurement time, but may be different.

In the measurement process of the above-described embodiment, the screw 20 is rotated while applying a back pressure to the screw 20, but the measurement operation is not particularly limited. For example, similarly to the above-described purging operation, the screw 20 is retracted, and the screw 20 is rotated at a predetermined number of revolutions at the retracted end position, and the operation of feeding the resin to the front of the screw 20 can also be performed as a measurement operation. In the rotation of the screw 20, the advancement and retreat of the screw 20 is prohibited, and it is possible to eliminate the influence of the nutring of the resin which may occur when the screw 20 is retracted during the rotation of the screw 20, and the measurement accuracy is good.

Further, although the injection device of the above embodiment is a coaxial screw type, it may be a screw pre-molding type. In the screw pre-molding type, it will be melted in the plasticizing cylinder The resin is supplied into the injection cylinder, and the molten resin is emitted from the injection cylinder into the mold device. In the screw pre-forming type, a screw is arranged in the plasticizing cylinder.

10‧‧‧Injection device

11‧‧‧Cylinder

12‧‧‧ nozzle

14‧‧‧ resin supply port

20‧‧‧ screw

21‧‧‧ Screw body

22‧‧‧ shot out

23‧‧‧Spiral Department

23a‧‧‧ Main body

23b‧‧ thread

24‧‧‧ Pressure components

26‧‧‧Thread groove

31‧‧‧ head

32‧‧‧ pole

33‧‧‧Anti-backflow ring

34‧‧‧Seal ring

40‧‧‧ Controller (setting support device)

41‧‧‧CPU

42‧‧‧ROM

43‧‧‧RAM

44‧‧‧Memory Department

45‧‧‧ Input Department

46‧‧‧Display Department

51‧‧‧Axis

60‧‧‧ drive

81‧‧‧Material supply device

82‧‧‧ hopper

83‧‧‧feed cylinder

84‧‧‧Guide

85‧‧‧feed screw

86‧‧‧Feed motor

H11‧‧‧heater

H12‧‧‧heater

H13‧‧‧heater

Claims (7)

An injection molding machine comprising: a pressure cylinder; a material supply device that supplies a molding material into the cylinder; a screw that is rotatably and reciprocally movable in the axial direction in the cylinder; and supports injection molding a setting support device for setting the machine, wherein the supply amount of the material supply device is stored in a 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 the rotation of the screw, and is based on the memory The relationship between the relationship, the measurement time, and the amount of molding material per one shot amount is set to the supply amount of the material supply device at the time of molding. The injection molding machine according to claim 1, wherein the material supply device includes a feed cylinder and is disposed to be rotatable in the feed cylinder and to be in the feed cylinder The feed screw is sent to the feed screw in the pressure cylinder, and the relationship is a relationship between the rotation speed of the feed screw indicating the supply amount of the material supply device and the flow rate, and the setting support device is based on the aforementioned relationship and measurement time. And the amount of the molding material to be injected, and the number of rotations of the feed screw at the time of molding is set. An injection molding machine according to claim 1 or 2, wherein When the above relationship is required, the flow rate is measured by rotating the screw while applying a back pressure to the screw. The injection molding machine according to claim 1 or 2, wherein, when the relationship is required, the flow rate is measured by rotating the screw that has been retracted to a predetermined position at the predetermined position. The injection molding machine according to any one of claims 1 to 4, wherein, in the molding, the screw rotates in synchronization with a feed screw of the material supply device. The injection molding machine according to claim 5, wherein, when the relationship is required, 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, and the setting support means is based on the memory The above relationship, the measurement time, and the amount of the molding material of the one shot amount are set for the number of rotations of the feed screw at the time of molding and the number of rotations of the screw at the time of molding. The injection molding machine according to claim 5, wherein when the relationship is required, 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 to be set at the time of molding. The ratio of the rotational speed of the aforementioned feed screw is a predetermined ratio.