WO2018070071A1

WO2018070071A1 - Injection molding machine

Info

Publication number: WO2018070071A1
Application number: PCT/JP2017/018050
Authority: WO
Inventors: 英昭飛田; 啓祐森; 雄一牧
Original assignee: 東芝機械株式会社
Priority date: 2016-10-12
Filing date: 2017-05-12
Publication date: 2018-04-19
Also published as: JP2018062112A; JP6935182B2

Abstract

[Problem] To provide an injection molding machine with which it is easy to control the pressure of molding material near a deceleration start position of a screw. [Solution] An injection molding machine according to the present embodiment molds a product through an injection step of injecting material into a mold and a pressure holding step of controlling a holding pressure of the material in the mold. The injection molding machine is provided with: a barrel in which the material is stored; a screw that injects the material from the barrel into the mold; a setting unit capable of setting a deceleration start position and a stop position of the screw in switching from the injection step to the pressure holding step; and a control unit that controls the speed of the screw on the basis of the deceleration start position and the stop position.

Description

Injection molding machine

Embodiments according to the present invention relate to an injection molding machine.

Conventionally, in order to fill the molten resin into the mold, the injection molding machine flows the molten resin into the cavity inside the mold in the injection process, and maintains the pressure on the molten resin in the pressure-holding process so that the molten resin enters the cavity. Is filled. The injection molding machine controls the screw speed in the injection process, and controls the pressure of the molten resin in the pressure holding process. In such switching from the injection process to the pressure holding process, the injection molding machine has switched from speed control to pressure control at a preset screw position.

Japanese Patent Application Laid-Open No. 61-229522

However, even if the screw position at the time of switching from speed control to pressure control is set, the difference between the actual pressure at the time of control switching and the pressure command value is large due to the inertial force of the drive system such as the motor and screw. There is. In such a case, a situation in which pressure control is impossible at the time of control switching may occur, and mechanical damage or burrs may occur. For example, the resin pressure may increase as the mold is filled with molten resin and may peak near the control switching position. If the injection pressure in the vicinity of this peak cannot be controlled, it may cause defects such as flash and sink marks.

Therefore, an object of the present invention is to provide an injection molding machine that can easily control the pressure of the molten resin and suppress the occurrence of defects.

The injection molding machine according to the present embodiment is an injection molding machine that molds a product by an injection process for injecting a material into a mold and a pressure holding process for controlling a pressure holding pressure of the material in the mold, and a barrel for storing the material. A screw that injects material from the barrel into the mold, a setting unit that can set a screw deceleration start position and a screw stop position in switching from the injection process to the pressure holding process, and a deceleration start position and a stop position. And a controller for controlling the speed of the screw.

The control unit may be able to set a stop period during which the screw is stopped during switching.

The deceleration start position may be set based on the material filling pressure in the injection process.

The stop position may be set based on the filling amount of the material in the injection process.

The injection molding machine according to the present embodiment is an injection molding machine that molds a product by an injection process for injecting a material into a mold and a pressure holding process for controlling a pressure holding pressure of the material in the mold, and a barrel for storing the material. The screw that injects the material from the barrel to the mold, the screw deceleration start position in the switching from the injection process to the pressure holding process, and the screw speed command becomes zero after the screw reaches the deceleration start position. And a control unit that controls the speed of the screw based on the deceleration start position and the deceleration command period.

The setting unit may be able to set a stop period during which the screw is stopped during switching.

The controller may decelerate the screw speed with a substantially constant deceleration during switching.

The control unit may change the deceleration of the screw speed during switching.

The controller may decelerate the screw speed exponentially at the time of switching.

The controller may decelerate the screw speed in an S-shaped curve at the time of switching.

The control unit may decelerate the screw speed in accordance with the speed at a preset time in the switching.

The block diagram which shows the structural example of the injection molding machine 1 according to 1st Embodiment. The figure which shows an example of a structure of the control part. The graph which shows an example of operation | movement of the injection molding machine. The graph which shows an example of the speed curve of the injection molding machine 1 according to 2nd Embodiment. The graph which shows an example of the speed curve of the injection molding machine 1 according to 2nd Embodiment. The graph which shows an example of the speed curve of the injection molding machine 1 according to 3rd Embodiment.

Embodiments according to the present invention will be described below with reference to the drawings. This embodiment does not limit the present invention.

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration example of an injection molding machine 1 according to the first embodiment. The injection molding machine 1 is a machine that can repeatedly execute a series of injection molding operations. For example, an operation of molding a molded product once is repeated as a cycle operation.

The injection molding machine 1 includes a frame 2, a fixed plate 3, a moving plate 4, a tie bar 5, a mold clamping drive mechanism 6, an injection device 7, a control unit 8, an extrusion mechanism 9, a human machine An interface 60, an injection pressure sensor S1, and a screw position sensor S2 are provided.

The frame 2 is the foundation of the injection molding machine 1. The fixed platen 3 is fixed on the frame 2. A fixed mold 11 is attached to the fixed platen 3. One end of the tie bar 5 is fixed to the fixed platen 3 and the other end is fixed to the support platen 10. The tie bar 5 extends from the fixed plate 3 to the support plate 10 through the moving plate 4.

The moving board 4 is placed on a linear guide (not shown) provided on the frame 2. The movable platen 4 is guided by a tie bar 5 or a linear guide, and can move toward or away from the fixed platen 3. A moving mold 12 is attached to the moving plate 4. The moving mold 12 faces the fixed mold 11, approaches the fixed mold 11 together with the moving board 4, and is combined with the fixed mold 11. When the moving mold 12 and the fixed mold 11 are brought into contact with each other, a space corresponding to the product shape is formed between the moving mold 12 and the fixed mold 11.

The mold clamping drive mechanism 6 includes a toggle mechanism 13 and a toggle mechanism drive unit 14. The toggle mechanism drive unit 14 includes a mold clamping servomotor 21, a ball screw 22, and a transmission mechanism 23 in order to drive the toggle mechanism 13. A cross head 15 is attached to the tip of the ball screw 22. As the ball screw 22 rotates, the crosshead 15 moves toward or away from the moving board 4. The transmission mechanism 23 transmits the rotation of the mold clamping servomotor 21 to the ball screw 22 and moves the crosshead 15.

When the toggle mechanism drive unit 14 moves the crosshead 15, the toggle mechanism 13 is activated. For example, when the cross head 15 moves toward the movable platen 4, the movable platen 4 moves toward the fixed platen 3 and the mold is closed. On the contrary, when the cross head 15 moves in a direction away from the movable platen 4, the movable platen 4 moves in a direction away from the fixed platen 3, and mold opening is performed.

The extrusion mechanism 9 includes an extrusion servo motor 71, a ball screw 72, and a transmission mechanism 73 in order to remove the molded product from the moving mold 12. The tip of the ball screw 72 penetrates the inner surface of the moving mold 12. As the ball screw 72 rotates, the ball screw 72 pushes out the product adhered to the inner surface of the moving mold 12. The transmission mechanism 73 transmits the rotation of the extrusion servomotor 71 to the ball screw 72, and moves the ball screw 72 in the left-right direction in FIG.

The injection device 7 includes a heating barrel (band heater) 41, a screw 42, a metering drive unit 43, and an injection drive unit 44. The heating barrel 41 includes a nozzle 41a for injecting molten resin into the mold cavity. The heating barrel 41 stores the resin from the hopper 45 while heating and melting it, and injects the molten resin from the nozzle. The screw 42 is provided to be movable while rotating inside the heating barrel 41 or without rotating. In the measuring step, the screw 42 rotates, and the injection amount of the molten resin injected from the barrel 41 is measured and determined by the rotation amount (movement distance) of the screw 42. In the injection process, the screw 42 moves without rotating and injects the molten resin from the nozzle.

The weighing drive unit 43 includes a weighing servo motor 46 and a transmission mechanism 47 that transmits the rotation of the weighing servo motor 46 to the screw 42. When the weighing servo motor 46 is driven and the screw 42 is rotated in the heating barrel 41, the resin is introduced from the hopper 45 into the heating barrel 41. The introduced resin is sent to the front end side of the heating barrel 41 while being heated and kneaded. The resin is melted and stored in the tip portion of the heating barrel 41. The molten resin is injected from the barrel 41 by moving the screw 42 in the direction opposite to that during the measurement. At this time, the screw 42 moves without rotating and pushes the molten resin from the nozzle. In this embodiment, a molten resin is used as the molding material. However, the molding material is not limited to the molten resin, and may be a metal, glass, rubber, a carbonized compound containing carbon fiber, or the like.

The injection drive unit 44 includes an injection servo motor 51, a ball screw 52, and a transmission mechanism 53. As the ball screw 52 rotates, the screw 42 moves in the left-right direction in FIG. The transmission mechanism 53 transmits the rotation of the injection servo motor 51 to the ball screw 52. Thereby, when the injection servo motor 51 rotates, the screw 42 moves. When the screw 42 pushes out the molten resin stored in the tip portion of the heating barrel 41 from the nozzle 41a, the molten resin is injected from the nozzle 41a.

The injection pressure sensor S1 detects the filling pressure when the molten resin is filled from the barrel 41 into the mold and the holding pressure in the holding process. In the injection process, the injection pressure sensor S1 detects the injection pressure of the molten resin material from the barrel 41 to the mold. In the pressure holding process, the injection pressure sensor S1 detects the pressure of the molten resin after switching the pressure holding from speed control to pressure control.

The screw position sensor S2 detects the position of the screw 42. Since the screw 42 moves with the rotation of the injection servomotor 51, the screw position sensor S2 may detect the position of the screw 42 from the rotation speed or angular position of the injection servomotor 51. By detecting the position of the screw 42 at every predetermined control cycle, the speed and acceleration of the screw 42 can be known.

The human machine interface (HMI / F) 60 displays various information related to the injection molding machine 1. The HMI / F 60 may include, for example, a display unit and a keyboard, or may be a touch panel display. The user can input settings such as a command related to the operation of the injection molding machine 1 through the HMI / F 60. For example, in injection molding, a product is molded by an injection process (speed control) for injecting a molten resin into a mold and a pressure holding process (pressure control) for controlling the pressure of the molten resin in the mold. In the present embodiment, a holding pressure switching period for maintaining the stop of the screw 42 is provided between the injection process and the holding pressure process. The user moves the screw 42 in the injection process, the deceleration start position (LS4) of the speed command of the screw 42, the final stop position (LS4α) of the screw 42, or the stop position (from the deceleration start position LS4 of the screw 42). Each set value such as a deceleration command period ta up to LS4α is input by the HMI / F 60 (the speed command of the screw 42 becomes zero). The moving speed, deceleration start position, stop position, and the like of the screw 42 can be set by the user based on the actual cycle operation and simulation of the injection molding machine 1. Further, the user may input the speed of the movable mold 12 in the mold clamping process and the mold opening process, the measurement speed in the measurement process, and the like with the HMI / F 60.

The control unit 8 monitors sensor information received from various sensors (not shown) during the injection process, and controls the injection device 7 based on the sensor information. Moreover, the control part 8 controls the screw 42 according to the said setting value set through HMI / F60. Further, the control unit 8 causes the display unit 100 to display necessary data.

FIG. 2 is a diagram illustrating an example of the configuration of the control unit 8. The control unit 8 includes an arithmetic processing unit 61, a setting unit 62, a storage unit 63, an injection device control unit 64, and an input / output unit 65.

The arithmetic processing unit 61 compares the detected value obtained from various sensors such as a pressure sensor and a temperature sensor with the set value stored in the setting unit 62 while comparing the temperature of the heating barrel 41, the speed of the screw 42, and the injection pressure. To control. The arithmetic processing unit 61 also controls each component of the control unit 8.

The setting unit 62 stores information input via the HMI / F 60. For example, the setting unit 62 rotates the rotation speed of the injection servo motor 51 or the moving speed of the screw 42, the holding pressure in the holding process, the deceleration start position (LS4) of the screw 42, and the final stop position (LS4α) of the screw 42. Or the setting information regarding the deceleration command period (ta) or the like is stored.

The storage unit 63 stores information such as a program for operating the injection molding machine 1, the set values, detection values obtained from various sensors, and the like.

The injection device control unit 64 controls the drive of the injection servo motor 51. The injection device control unit 64 controls the injection pressure of the injection device 7 by controlling the driving of the injection servomotor 51, for example. The injection device controller 64 receives the feedback from the screw position sensor S2, corrects the position command and the speed command, and controls the injection servo motor 51.

The input / output unit 65 is configured to take in information from the outside to the control unit 8 or output the information of the control unit 8 to the outside. The input / output unit 65 can be communicably connected to other terminals by wire or wirelessly.

Next, an operation example of the injection molding machine 1 in the injection process and the holding pressure switching period will be described.

3 (A) to 3 (C) are graphs showing an example of the operation of the injection molding machine 1. FIG. The horizontal axis of the graphs of FIGS. 3A to 3C is time. 3A to 3C, the vertical axis represents the position of the screw 42, the speed of the screw 42, and the filling pressure of the molten resin, respectively. The solid line Pa in FIG. 3A indicates the actual position of the screw 42, and the broken line Pb indicates the position command value of the screw 42. The solid line Va in FIG. 3B indicates the actual speed of the screw 42, and the broken line Vb indicates the speed command value of the screw 42. Hereinafter, the operation of the injection molding machine 1 will be described in time series. The position and speed of the screw 42 can be obtained based on the detection value from the screw position sensor S2. The filling pressure can be obtained based on the detected value from the injection pressure sensor S1. In addition, it is assumed that the mold clamping process and the molten resin measurement process have already been completed, and the description starts from the injection process.

First, at t0, the injection process is started. At this time, the screw 42 is at a position away from the origin 0 by LS5 as shown in FIG. Thereafter, the screw 42 approaches the origin (the tip of the barrel 41). Here, the actual position Pa of the screw 42 is delayed with respect to the position command value Pb by the amount of delay due to feedback control. Accordingly, although the actual position Pa follows the position command value Pb, the position Pa is approximately (L1-L) away from the position command value Pb from t0 to t3.

From t0 to t2, the screw 42 is accelerated at a predetermined acceleration as shown in FIG. Here, the actual speed Va of the screw 42 is delayed with respect to the speed command value Vb by the amount of delay due to feedback control. Accordingly, the actual speed Va follows the speed command value Vb, but is displaced somewhat later than the speed command value Vb. For example, the speed command value Vb indicates the predetermined speed Vc at t1, but the actual speed Va reaches the predetermined speed Vc at t2.

From t2 to t3, the screw 42 maintains the predetermined speed Vc. After t0, also in this period, the molten resin flows from the barrel 41 into the mold and is filled in the mold cavity. When there are still many cavities in the cavity, the filling pressure shown in FIG. 3C changes at a relatively low value. On the other hand, when the number of cavities in the cavity decreases, the filling pressure increases as shown in the vicinity of t3.

At t3, as shown in FIG. 3A, when the actual position Pa of the screw 42 reaches a preset deceleration start position LS4, the injection device controller 64 causes the screw to move as shown in FIG. 42 starts decelerating. The deceleration start position LS4 can be arbitrarily set by the user as described above. For example, the user may confirm the position of the screw 42 when the filling pressure becomes the predetermined packing pressure Pp by trial operation or simulation, and set the position in the setting unit 62 as the deceleration start position LS4. At this time, the peak value Pmax immediately after the packing pressure Pp is set so as not to exceed the filling pressure for generating flash or the like. In this way, the user can set the deceleration start position LS4 based on the packing pressure Pp with reference to the packing pressure Pp close to the peak value Pmax of the filling pressure. Thereby, generation | occurrence | production of defects, such as a flash, can be suppressed. The “burr” is a phenomenon in which the molten resin protrudes from the contact surface (parting surface) of the mold due to excessive filling pressure. Further, the stop position LS4α can be arbitrarily set by the user. For example, since the weight of a molded product is usually determined, the amount of molten resin to be filled is also determined. The amount of molten resin to be filled can be converted into the moving distance Ds of the screw 42. Therefore, the stop position LS4α of the screw 42 can be set in advance by the user.

From t3 to t4, as shown in FIG. 3B, the control unit 8 decelerates the screw 42 and stops the screw 42 at t4. Therefore, at t4, the control unit 8 sets the speed command value Vb to zero. Here, the deceleration start position LS4 and the stop position LS4α are set in advance. Further, the speed of the screw 42 or the motor 51 (initial speed Vc) at the deceleration start position LS4 can be detected by a position encoder disposed in the motor 51 or the like. The control unit 8 uses the difference between the deceleration start position LS4 and the stop position LS4α (deceleration distance L1) and the initial speed Vc to set a predetermined acceleration (or so as to make the initial speed Vc at the deceleration start position LS4 zero at the stop position LS4α. (Deceleration) α (α = Vc ² / (2 × L1)) can be calculated. Further, the control unit 8 calculates a movement amount (distribution amount) D (D = Vc−α × ts × n) for each sampling period ts when decelerating at the acceleration α, and corresponds to the sampling in each sampling. The motor 51 is controlled by a speed command based on the movement amount. Note that n is the number of samplings from the deceleration start position LS4 to the stop position LS4α (n = 1 to 2 × L1 / (Vc × ts)). The control unit 8 decelerates the initial speed Vc of the motor 51 and the screw 42 at the deceleration start position LS4 with the acceleration α, and sets the speed command value of the motor 51 to zero at t4.

At time t4, the actual speed Va is delayed from the speed command value Vb, and thus is not zero. At this time, as shown in FIG. 3A, the position command value Pb of the screw 42 is controlled to be zero at the final stop position LS4α. However, since the actual position Pa is delayed with respect to the position command value Pb, it does not reach the stop position LS4α.

Thereafter, at t5, the actual speed Va of the screw 42 becomes almost zero, and the actual position Pa reaches the stop position LS4α. The control unit 8 may determine that the screw 42 has stopped when the actual speed Va becomes less than a predetermined ratio of the speed at t4. Thus, the command position Pb of the screw 42 stops at the stop position LS4α at t4, and the actual position Pa of the screw 42 stops at the stop position LS4α at t5. Thus, in the present embodiment, the control unit 8 can stop the motor 51 and the screw 42 at the stop position LS4α by speed control.

From t5 to t6, the control unit 8 stops the screw 42 and enters the holding pressure switching period Ts. In the holding pressure switching period Ts as the stop period, the control unit 8 maintains the stop state of the screw 42. Accordingly, the molten resin can be sufficiently spread in the cavity of the mold by using natural pressure, and molding defects such as sink marks can be suppressed. The “sink” is a phenomenon in which the resin in the mold cavity is dented or dented due to a decrease in filling pressure or holding pressure or molding shrinkage.

Ds in FIG. 3 (A) indicates the moving distance of the screw 42. Since the cross-sectional area of the barrel 41 is determined in advance, the injection amount of the molten resin is uniquely determined based on the movement distance Ds (injection amount = cross-sectional area of the barrel 41 × Ds). That is, it may be said that the moving distance Ds of the screw 42 represents the injection amount.

After t6, the injection device controller 64 controls the pressure of the screw 42 and enters the pressure holding process. Thereafter, the injection molding machine 1 completes one cycle operation through a cooling process, a metering process, a mold opening process, an extrusion process, and the like. The injection molding machine 1 may repeatedly execute the same cycle operation.

As described above, in this embodiment, the deceleration start position LS4 and the stop position LS4α are set by the user. The control unit 8 can calculate the acceleration (deceleration) α from the difference (deceleration distance L1) between the deceleration start position LS4 and the stop position LS4α, and can control the speed of the screw 42 by using the acceleration α. .

If the speed control is switched to the pressure control when the screw reaches the deceleration start position LS4, the actual pressure at the time of switching from the speed control to the pressure control due to the inertial force of the screw drive system such as the motor The difference from the holding pressure (pressure command) may increase. In this case, it cannot be controlled by braking by pressure control, and a sudden pressure increase may occur, which causes damage to the machine or generation of burrs.

In contrast, in the present embodiment, the control unit 8 stops the screw 42 at the stop position LS4α by speed control. Thereafter, the control unit 8 maintains the stopped state of the screw 42 in the holding pressure switching period Ts, and switches from speed control to pressure control after reducing the difference between the actual pressure and the holding pressure (pressure command). As a result, the injection molding machine according to the present embodiment suppresses the difference between the actual pressure and the holding pressure (pressure command) when switching from speed control to pressure control, and suppresses breakage of the machine and occurrence of burrs. Meanwhile, the holding pressure can be controlled in the holding step.

In the present embodiment, the timing for switching from the speed control to the pressure control is a time point t6 when the holding pressure switching period Ts ends. However, the timing for switching from speed control to pressure control may be the time t4 when the speed command becomes zero or the time t5 when the screw 42 actually stops. The holding pressure switching period Ts can be arbitrarily set by the user.

The time t5 when the screw 42 actually stops is smaller in the difference between the actual pressure and the holding pressure (pressure command) than the time t4 when the speed command becomes zero (see FIG. 3C). Therefore, it is preferable that the control unit 8 switches from speed control to pressure control at time t5 rather than time t4. In this case, the holding pressure switching period Ts becomes almost zero. The time point t5 is after the elapse of the delay period tb from the time point t4.

The delay period tb (t4 to t5) of the actual speed Va with respect to the speed command value Vb is determined using the reciprocal of the position loop gain ω0, and is expressed by Expression 1. The delay period tb is uniquely determined by the position loop gain ω0.
tb = 1 / ω0 (Formula 1)
The control unit 8 may calculate Equation 1 and switch from speed control to pressure control after a time ta + tb has elapsed from the deceleration start time t3. Thus, in the present embodiment, the timing for switching from speed control to pressure control may be the time t5 after the delay time tb has elapsed from the time t4 when the speed command becomes substantially zero.

(Modification)
In the first embodiment, the deceleration start position LS4 and the stop position LS4α are parameters that can be set by the user. The control unit 8 controls the screw 42 based on these parameters.

On the other hand, in this modification, the user sets the deceleration start position LS4 and the deceleration command period ta. In this case, the control unit 8 calculates the actual deceleration distance L1 (L1 = Vc / (2 × ta)) based on the deceleration command period ta, the deceleration start position LS4, and the initial speed Vc. The deceleration distance L1 corresponds to the area of the hatched portion SL in FIG. The sum of the deceleration start position LS4 and the deceleration distance L1 becomes the stop position LS4α. The calculation unit 8 uses the deceleration distance L1 and the initial speed Vc, as in the first embodiment, the acceleration (or deceleration) α (α = Vc ² / (2 × L1)) and the movement amount for each sampling period ts. (Distribution amount) D (D = Vc−α × ts × n) can be calculated. Thereby, the control part 8 of this modification can stop the motor 51 and the screw 42 to the stop position LS4α by speed control. Therefore, this modification can also obtain the same effect as the first embodiment.

In the above embodiment, the holding pressure switching period Ts as the stop period of the screw 42 in the holding pressure switching period may be variable. In this case, the user can set the holding pressure switching period Ts via the HMI / F60. For example, when the stop period (restraint period) of the screw 42 is set to almost zero, the holding pressure switching period Ts may be set to zero. In this case, the injection molding machine 1 enters the pressure holding process from the time t5 when the screw 42 stops.

(Second Embodiment)
In the first embodiment, the deceleration α of the screw 42 in the deceleration command period ta is substantially constant. On the other hand, in the second embodiment, the deceleration of the screw 42 is variable. Thereby, the curve of a filling pressure can be made into a desired curve.

4 and 5 are graphs showing an example of a speed curve of the injection molding machine 1 according to the second embodiment. For example, as shown at t3 to t4 in FIG. 4, the control unit 8 may decrease the speed command Vb exponentially. The exponential function setting parameters (time point and speed setting) may be stored in the storage unit 63 in advance. Further, as indicated by t3 to t4 in FIG. 5, the control unit 8 may decrease the speed command Vb in an S shape. The setting parameter for the S-shaped curve may be stored in the storage unit 63 in advance.

(Third embodiment)
FIG. 6 is a graph showing an example of a speed curve of the injection molding machine 1 according to the third embodiment. The third embodiment is the same as the second embodiment in that the deceleration of the screw 42 is variable. However, in the third embodiment, the user can arbitrarily set the speed and time. For example, as shown in t3 to t4 in FIG. 6, the user sets the speed of the screw 42 to Vs1 at the time ts1, sets the speed of the screw 42 to Vs2 at the time ts2, and sets the time ts3. Is set so that the speed of the screw 42 becomes Vs3, and at the time ts4, the speed of the screw 42 is set to Vs4. These setting parameters are stored in the storage unit 63. The control unit 8 decreases the speed command Vb according to the setting parameter stored in the storage unit 63.

In this way, by allowing the user to arbitrarily set the time and speed setting parameters, the filling pressure curve (trajectory) during the holding pressure switching period can be set to a desired curve. As a result, the injection molding machine 1 according to the third embodiment can cope with various molding materials and molds. The number of settable time points and the number of speeds are not limited to four, and may be more or less. Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Injection molding machine, 7 ... Injection apparatus, 8 ... Control part, 60 ... Human machine interface, S1 ... Injection pressure sensor, S2 ... Screw position sensor

Claims

An injection molding machine for molding a product by an injection process of injecting a material into a mold and a pressure holding process for controlling a pressure holding pressure of the material in the mold,
A barrel for storing the material;
A screw for injecting the material from the barrel into the mold;
A setting unit capable of setting a deceleration start position of the screw and a stop position of the screw in switching from the injection process to the pressure holding process;
An injection molding machine comprising: a control unit that controls the speed of the screw based on the deceleration start position and the stop position.
The injection molding machine according to claim 1, wherein the setting unit is capable of setting a stop period during which the screw is stopped in the switching.
The injection molding machine according to claim 1 or 2, wherein the deceleration start position is set based on a filling pressure of the material in the injection process.
The injection molding machine according to any one of claims 1 to 3, wherein the stop position is set based on a filling amount of the material in the injection process.
An injection molding machine for molding a product by an injection process of injecting a material into a mold and a pressure holding process for controlling a pressure holding pressure of the material in the mold,
A barrel for storing the material;
A screw for injecting the material from the barrel into the mold;
The screw deceleration start position in switching from the injection process to the pressure holding process, and a deceleration command period from when the screw reaches the deceleration start position until the screw speed command becomes zero can be set. A setting section;
An injection molding machine comprising: a control unit that performs speed control of the screw based on the deceleration start position and the deceleration command period.
The injection molding machine according to claim 5, wherein the setting unit can set a stop period during which the screw is stopped in the switching.
The injection molding machine according to claim 5 or 6, wherein the deceleration start position is set based on a filling pressure of the material in the injection process.
The injection molding machine according to any one of claims 1 to 7, wherein the control unit decelerates the speed of the screw at a substantially constant deceleration in the switching.
The injection molding machine according to any one of claims 1 to 7, wherein the control unit changes a deceleration of the screw speed in the switching.
The injection molding machine according to claim 6 or 9, wherein the control unit exponentially reduces the speed of the screw in the switching.
The injection molding machine according to claim 6 or 9, wherein the control unit decelerates the speed of the screw in an S-shaped curve in the switching.
The injection molding machine according to claim 6 or 9, wherein the control unit decelerates the speed of the screw in the switching according to a speed at a preset time point.