JP7368250B2 - Injection molding machine - Google Patents

Description

The present invention relates to an injection molding machine that performs injection molding by sequentially moving a plurality of molds to injection positions.

An example of a conventional injection molding machine is disclosed in Patent Document 1. In the injection molding machine of Patent Document 1, four molds are installed on a rotary table, and these molds are moved clockwise. In this injection molding machine, when the injection station for injecting resin material into the mold is set at the 0 o'clock position, the 3 o'clock and 6 o'clock positions are cooling stations for cooling the resin, and the 9 o'clock position is the cooling station for cooling the resin. , serves as a molded product take-out station that takes out the molded product from the mold.

This injection molding machine sequentially moves each mold to an injection station, two cooling stations, and a molded product removal station by rotating a rotary table. The injection molding machine then performs an injection operation, a cooling operation, and a molded product removal operation at each station to mold the molded product.

JP2010-99865A

The injection molding machine described above executes a normal molding operation of repeatedly molding a molded product using a plurality of molds. During a normal molding operation, one of the plurality of molds may malfunction, or a predetermined molding quantity may be reached, for example. In such a case, the injection molding machine performs a skip molding operation in which the order of one mold is skipped and molding is subsequently performed using the remaining molds. However, in order to switch from the normal molding operation to the skip molding operation in the above-mentioned injection molding machine, settings such as the timing of plasticizing the resin material and the presence or absence of the ejecting operation of the molded product must be changed. Therefore, in the above-mentioned injection molding machine, switching to the skip molding operation is complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an injection molding machine that can easily switch from normal molding operation to skip molding operation.

In order to achieve the above object, an injection molding machine according to the present invention is an injection molding machine having a rotary table, and has a normal molding mode in which a molding operation is performed using a plurality of molds installed on the rotary table. and a skip molding mode in which a molding operation is performed using the remaining molds after removing one or more molds from the plurality of molds used in the normal molding mode. Features.

In the present invention, it is preferable to have an input device into which a switching operation from the normal molding mode to the skip molding mode is input.

In the present invention, a rotational drive mechanism that rotates the rotary table, an injection device that injects a resin material into the mold, a molded product take-out device that takes out a molded product from the mold, the rotational drive mechanism, and the injection device. and a control device that controls the molded product take-out device, and the control device moves the plurality of molds installed on the rotary table to an injection position and a molded product take-out position in the molding operation. The rotation drive mechanism is controlled to plasticize the resin material to be injected into the mold, and the injection device is controlled to inject the resin material when the mold moves to the injection position. Preferably, the molded product take-out device is controlled so as to take out the molded product from the mold at the take-out position.

In the present invention, the plurality of molds include a mold A, a mold B, and a mold C that are sequentially moved to the injection position, and the control device is configured to control when the mold A is moved to the injection position in the normal molding mode. Controlling the injection device to inject a resin material into the mold A and plasticize the resin material injected into the mold B when the mold B is at the injection position; , controlling the injection device to inject a resin material into the mold B and plasticizing the resin material injected into the mold C, and in the skip molding mode, perform the molding operation except for the mold B. When the mold A is at the injection position, the injection device is injected into the mold A, the injection device is controlled so as not to plasticize the resin material, and the mold A is injected into the injection position. When the mold B is installed at the injection position, the injection device is preferably controlled so as not to inject the resin material, but to plasticize the resin material injected into the mold C.

In the present invention, in the skip molding mode, the control device moves the mold A to the injection position after at least a minimum mold stop time of the mold A has elapsed since the mold A was moved to the injection position. Preferably, the rotational drive mechanism is controlled to move from the injection position.

In the present invention, in the skip molding mode, after at least a minimum mold stop time of the mold B has elapsed from the time when the installation location of the mold B is moved to the injection position, the control device It is preferable to control the rotational drive mechanism so as to move the installation location of B from the injection position.

In the present invention, the mold minimum stop time is set to the time from when the mold moves to the injection position to when the mold moves from the injection position corresponding to the mold minimum stop time in the normal molding mode. Preferably, the setting is based on

In the present invention, in the skip molding mode, after the plasticization waiting time of the mold C has elapsed from the time when the installation location of the mold B is moved to the injection position, the control device moves the mold B to the mold C. Preferably, the injection device is controlled to plasticize the resin material to be injected.

In the present invention, the plasticization waiting time of the mold C is the time from when the mold B moves to the injection position in the normal molding mode to when the resin material injected into the mold C is plasticized. It is preferable that the setting is based on.

The plurality of molds include a mold A, a mold B, and a mold C that are sequentially moved to the injection position, and the control device determines that the mold A is at the injection position in the normal molding mode. When the injection device is controlled to inject a resin material into the mold A and plasticize the resin material injected into the mold B, and when the mold B is at the injection position, the mold The injection device is controlled to inject a resin material into the mold B and plasticize the resin material injected into the mold C, and when the mold A is at the molded product ejection position, molding from the mold A is performed. controlling the molded product take-out device to take out the molded product; when the mold B is at the molded product take-out position, controlling the molded product take-out device to take out the molded product from the mold B; In the molding mode, when the molding operation is performed except for the mold B, when the mold A is at the injection position, a resin material is injected into the mold A and into the mold B. controlling the injection device to plasticize the resin material, injecting the resin material into the mold B when the mold B is at the injection position, and plasticizing the resin material injected into the mold C; When the mold A is at the molded product take-out position, the molded product take-out device is controlled so that the molded product is taken out from the mold A, and when the mold B is at the molded product take-out position. It is preferable to control the molded product ejecting device so as to discard the resin material injected into the mold B when it is at the molded product ejecting position.

In the present invention, it is preferable that a mold substitute device is installed in place of the mold B on the rotary table in the skip molding mode.

According to the present invention, there is a normal molding mode in which a molding operation is performed using a plurality of molds installed on a rotary table, and a molding operation in which one or more molds are removed from among the plurality of molds used in the normal molding mode. There is also a skip molding mode in which the molding operation is performed using the remaining mold. Therefore, the skip molding operation can be easily performed by switching from the normal molding mode to the skip molding mode.

Moreover, by further having an input device into which a switching operation from the normal molding mode to the skip molding mode is input, skip molding can be executed more easily.

1 is a front view of an injection molding machine according to a first embodiment of the present invention. 2 is a plan view of a mold clamping device and its vicinity included in the injection molding machine of FIG. 1. FIG. 2 is a diagram illustrating functional blocks of the injection molding machine of FIG. 1. FIG. FIG. 2 is a sectional view of the mold clamping device of the injection molding machine of FIG. 1 and its vicinity. 2 is a diagram illustrating a normal molding mode of the injection molding machine of FIG. 1. FIG. 2 is a diagram illustrating a skip molding mode of the injection molding machine of FIG. 1. FIG. It is a figure explaining the skip molding mode of the injection molding machine which concerns on 2nd Embodiment of this invention.

(First embodiment)
The configuration of an injection molding machine according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a front view of an injection molding machine according to a first embodiment of the present invention. FIG. 2 is a plan view of a mold clamping device and its vicinity that the injection molding machine of FIG. 1 has. FIG. 3 is a diagram illustrating functional blocks of the injection molding machine of FIG. 1. FIG. 4 is a sectional view of the mold clamping device of the injection molding machine of FIG. 1 and its vicinity.

The injection molding machine 1 of this embodiment obtains a molded product by injecting and filling a plasticized resin material into a cavity 84 of a mold 80 having an upper mold 81 and a lower mold 82, and cooling and solidifying it. It is. Note that this embodiment shows an example of a configuration in which the present invention is applied to an injection molding machine in which the heating cylinders are arranged along the vertical direction (vertical direction); The present invention may be applied to an injection molding machine that is

The injection molding machine 1 has a configuration in which a plurality of types of molds 80 having different shapes of cavities 84 can be installed on the rotary table 11. Note that a plurality of molds 80 of the same type with cavities 84 having the same shape may be installed on the rotary table 11.

As shown in each figure, the injection molding machine 1 includes a mold clamping device 10 that clamps a mold 80, an injection device 20 that injects a resin material, and a molded product ejection device 40 that takes out a molded product from the mold 80. , a display input device 60, and a control device 70.

The mold clamping device 10 includes a disc-shaped rotary table 11 and a triangular flat movable die plate 12. The mold clamping device 10 also includes a rotary drive mechanism 13 that drives the rotary table 11 to rotate clockwise around the center, and a mold clamping force that clamps the upper mold 81 and the lower mold 82 in the vertical direction. It has a mold clamping drive mechanism 14 for generating the mold clamping force.

The upper surface 11a of the rotary table 11 is provided with installation locations 15a, 15b, 15c, and 15d where a plurality of molds 80 are installed. The plurality of molds 80 is composed of four molds 80. When the four molds 80 are to be explained separately, they will be referred to as molds 80A, 80B, 80C, and 80D, and the upper mold 81, lower mold 82, and cavity 84 will be designated by the symbols A to D at the end. shown below. The molds 80A, 80B, 80C, and 80D are installed in order at installation locations 15a, 15b, 15c, and 15d. The plurality of molds 80 are moved by the rotary table 11 and positioned at four work stations: injection station P1, first cooling station P2, second cooling station P3, and molded product removal station P4.

The injection station P1 is an injection position where the mold 80 is clamped and a plasticized resin material is injected. The first cooling station P2 and the second cooling station P3 are located at 3 o'clock and 6 o'clock positions when the injection station P1 is set at the 0 o'clock position in a plan view, and are used for cooling the resin material injected into the mold 80. It's the location. The molded product take-out station P4 is located at the 9 o'clock position when the injection station is set at the 0 o'clock position, and is a molded product take-out position where the mold 80 is opened and the molded product is taken out.

In addition to such a configuration, for example, the first cooling station P2 and the second cooling station P3 may be omitted, the injection station P1 may be located at the 0 o'clock position, and the molded product ejection station P4 may be located at the 6 o'clock position. It may also be a configuration. Alternatively, the second cooling station P3 may be omitted, and the injection station P1 may be located at the 0 o'clock position, the first cooling station P2 may be located at the 4 o'clock position, and the molded product removal station P4 may be located at the 8 o'clock position. It may also be a configuration. The rotary table 11 may be any type as long as it moves the mold 80 to at least the injection station P1 and the molded product removal station P4.

The movable die plate 12 is provided facing the rotary table 11 at a position corresponding to the injection station P1 with an interval in the vertical direction. Rotary table 11 and movable die plate 12 close mold 80 at injection station P1. The mold clamping drive mechanism 14 generates mold clamping force on the mold 80 that is closed between the rotary table 11 and the movable die plate 12. The rotational drive mechanism 13 includes, for example, an electric motor and a transmission mechanism that transmits the rotational force of the electric motor to the rotary table 11. The mold clamping drive mechanism 14 includes an electric motor, a ball screw mechanism, a toggle link mechanism, and the like. The rotation drive mechanism 13 and the mold clamping drive mechanism 14 are connected to the control device 70 and operate according to control signals from the control device 70.

The injection device 20 is arranged above the movable die plate 12. The injection device 20 includes a heating cylinder 21 having a downwardly facing nozzle 21a at its tip, and a screw 22 housed in the heating cylinder 21 so as to be rotatable and movable back and forth. It also has an injection device drive mechanism 23 that moves the injection device 20 in the vertical direction, and a screw drive mechanism 24 that rotates and moves the screw 22 back and forth within the heating cylinder 21. The movement of the screw 22 toward the nozzle 21a of the heating cylinder 21 is referred to as forward movement, and the movement of the screw 22 to the side opposite to the nozzle 21a is referred to as backward movement. The injection device drive mechanism 23 and the screw drive mechanism 24 are connected to a control device 70 and operate according to control signals from the control device 70. The injection device drive mechanism 23 and the screw drive mechanism 24 include, for example, an electric motor, a transmission mechanism that transmits the rotational force of the electric motor, a conversion mechanism that converts the rotational force into linear motion, and the like.

When the control device 70 controls the injection device drive mechanism 23 to move the injection device 20 downward, the nozzle 21a of the heating cylinder 21 passes through the through hole 12a provided in the movable die plate 12 and moves to the upper side of the mold 80. Touch the mold 81. In this state, the nozzle 21a communicates with the cavity 84 via a resin flow path 85 having a runner, a spool, a gate, and the like. Then, the control device 70 controls the screw drive mechanism 24 to rotate the screw 22 to plasticize the resin material, and also measures the amount of resin material according to the cavity 84 of the mold 80. Then, the control device 70 controls the screw drive mechanism 24 to advance the screw 22 and inject the resin material into the cavity 84.

The molded product removal device 40 is arranged at a position corresponding to the molded product removal station P4. The molded product take-out device 40 includes a mold opening/closing device 41, an ejector device 42, and a take-out machine 43. The mold opening/closing device 41 has, for example, an air cylinder, and moves the upper mold 81 in the vertical direction with respect to the lower mold 82. The ejector device 42 causes an ejector pin (not shown) provided in the lower mold 82 to protrude into the cavity 84 to extrude the molded product from the cavity 84 . The take-out machine 43 moves the molded product extruded from the cavity 84 to a predetermined location.

The display input device 60 includes a display device 61 that displays information regarding the injection molding machine 1, and an input device 62 that inputs operations. Display device 61 and input device 62 are connected to control device 70 . The display device 61 displays various screens in a display area. The input device 62 includes input keys, and transmits signals corresponding to each input key to the control device 70. The display input device 60 includes a touch panel as the input device 62, and has a software switch configured by combining the touch panel superimposed on the display area of the display device 61 and icons displayed in the display area.

The control device 70 controls the operation of the injection molding machine 1 as a whole. The control device 70 includes a microcomputer.

The control device 70 includes a rotational drive mechanism 13 and a mold clamping drive mechanism 14 of the mold clamping device 10, an injection device drive mechanism 23 and a screw drive mechanism 24 of the injection device 20, and a mold opening/closing device 41 of the molded product removal device 40. The operation of each drive mechanism such as the ejector device 42 and the take-out machine 43 is controlled.

Specifically, in the molding operation, the control device 70
(1) Controlling the rotational drive mechanism 13 to move the plurality of molds 80 installed on the rotary table 11 to the injection station P1, the first cooling station P2, the second cooling station P3, and the molded product removal station P4,
(2) The mold clamping drive mechanism 14, the injection device drive mechanism 23, and the screw drive mechanism 24 plasticize the resin material to be injected into the mold 80 and inject it when the mold 80 moves to the injection station P1. control,
(3) Control the mold opening/closing device 41, ejector device 42, and take-out machine 43 to take out the molded product from the mold 80 at the molded product take-out station P4.

The injection molding machine 1 has a normal molding mode and a skip molding mode as operation modes for performing molding operations. The memory of the injection molding machine 1 stores programs and various settings for executing molding operations in the normal molding mode and the skip molding mode.

In the normal molding mode, a molding operation is performed using a plurality of molds 80 installed on the rotary table 11. In the skip molding mode, a molding operation is performed using the molds remaining after removing one or more molds from among the plurality of molds 80 used in the normal molding mode. In this embodiment, the injection molding machine 1 is switched from the normal molding mode to the skip molding mode by inputting a predetermined operation to the input device 62. This predetermined operation is, for example, an operation of pressing an operation key to which operation mode switching processing is assigned. Alternatively, when a predetermined number of molding operations are completed in one of the plurality of molds 80, the molding operation is automatically performed using the remaining molds excluding the one mold. Switching to skip molding mode may also be performed.

Next, an example of the operation according to the present invention in the injection molding machine 1 of the present embodiment described above will be described with reference to FIGS. 5 and 6.

FIGS. 5(a) to 5(d) show the molding operation in the normal molding mode.

The upper part of FIG. 5 is a plan view schematically showing the positions of the molds 80A to 80D. In the upper diagram of FIG. 5, A to D indicate molds 80A to 80D. The diagram at the bottom of Figure 5 schematically shows the operation timings of injection operation (“injection”), plasticization operation (“plasticization”), molded product removal operation (“ejection”), and mold movement operation (“movement”). FIG. In this timing chart, "ON" indicates that the device is in operation, and "OFF" indicates that it is not in operation. Further, in the timing chart, A to D indicate operations related to the molds 80A to 80D.

The injection molding machine 1 (specifically, the control device 70) rotates the rotary table 11 and moves the mold 80A to the injection station P1 (mold moving operation). In this state, as shown in FIG. 5(a), there is a mold 80A in the injection station P1, a mold 80D in the first cooling station P2, a mold 80C in the second cooling station P3, and the molded product There is a mold 80B at the take-out station P4.

In the state shown in FIG. 5(a), the injection molding machine 1 clamps the mold 80A, moves the injection device 20 downward, and touches the nozzle 21a of the heating cylinder 21 to the upper mold 81A of the mold 80A. Then, the resin material that has already been plasticized for the mold 80A is injected into the mold 80A (injection operation). After completing the injection operation, the injection molding machine 1 plasticizes the resin material to be injected into the mold 80B (plasticization operation). Then, the injection molding machine 1 moves the injection device 20 upward to separate the nozzle 21a of the heating cylinder 21 from the upper mold 81A of the mold 80A, and releases the mold clamping.

In parallel with the above-mentioned injection operation and plasticizing operation, the injection molding machine 1 moves the upper mold 81B of the mold 80B located at the molded product removal station P4 upward to open the mold 80B, and the ejector device 42 injects the cavity into the mold 80B. Extrude the molded product from 84B. Then, the injection molding machine 1 uses the take-out machine 43 to move the molded product to a molded product conveyance device (not shown), such as a conveyor or a storage container (molded product take-out operation). Furthermore, the mold 80D and the mold 80C are cooled at the first cooling station P2 and the second cooling station P3.

When the injection molding machine 1 finishes the injection operation, plasticization operation, and molded product removal operation in the state shown in FIG. 5(a), it rotates the rotary table 11 and moves the mold 80B to the injection station P1 ( movement movement). In this state, as shown in FIG. 5(b), there is a mold 80B in the injection station P1, a mold 80A in the first cooling station P2, a mold 80D in the second cooling station P3, and the molded product There is a mold 80C at the take-out station P4.

In the state shown in FIG. 5(b), the injection molding machine 1 clamps the mold 80B, moves the injection device 20 downward, and touches the nozzle 21a of the heating cylinder 21 to the upper mold 81B of the mold 80B. Then, the resin material that has already been plasticized for the mold 80B is injected into the mold 80B (injection operation). After completing the injection operation, the injection molding machine 1 plasticizes the resin material to be injected into the mold 80C (plasticization operation). Then, the injection molding machine 1 moves the injection device 20 upward to separate the nozzle 21a of the heating cylinder 21 from the upper mold 81B of the mold 80B, and releases the mold clamping.

In parallel with the above-mentioned injection operation and plasticizing operation, the injection molding machine 1 moves the upper mold 81C of the mold 80C in the molded product take-out station P4 upward to open the mold 80C, and the ejector device 42 opens the mold 80C. Extrude the molded product from 84C. Then, the injection molding machine 1 uses the take-out machine 43 to move the molded product to a molded product conveying section such as a conveyor or a storage container (not shown) (molded product take-out operation). Furthermore, the mold 80A and the mold 80D are cooled at the first cooling station P2 and the second cooling station P3.

After the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product removal operation in the state shown in FIG. 5(b), it rotates the rotary table 11 and moves the mold 80C to the injection station P1 (mold movement movement). In this state, as shown in FIG. 5(c), there is a mold 80C in the injection station P1, a mold 80B in the first cooling station P2, a mold 80A in the second cooling station P3, and the molded product There is a mold 80D at the take-out station P4. In the state shown in FIG. 5(c), the injection operation for the mold 80C and the plasticizing operation for the mold 80D are performed in the same manner as in the states shown in FIGS. 5(a) and (b) above. Execute the molded product removal operation.

When the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product ejection operation in the state shown in FIG. 5(c), it rotates the rotary table 11 and moves the mold 80D to the injection station P1 (mold movement movement). In this state, as shown in FIG. 5(d), there is a mold 80D in the injection station P1, a mold 80C in the first cooling station P2, a mold 80B in the second cooling station P3, and the molded product There is a mold 80A at the take-out station P4. In the state shown in FIG. 5(d), similarly to the states shown in FIGS. 5(a) to (c), the injection operation for the mold 80D and the plasticizing operation for the mold 80A are performed, and the molding for the mold 80A is performed. Performs item removal operation.

When the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product removal operation in the state shown in FIG. 5(d), it rotates the rotary table 11, moves the mold 80A to the injection station P1, and The state returns to the state shown in 5(a). After that, the above operation is repeated.

In the normal molding mode, the injection molding machine 1 measures the time ta from when the mold 80A is moved to the injection station P1 to when it is moved from the injection station P1. Then, the minimum mold stop time Ta for the mold 80A is set based on the time ta. The mold minimum stop time Ta is set to the time ta measured immediately before a predetermined time capture operation such as pressing an operation key is input to the input device 62. In addition to this, the mold minimum stop time Ta may be set to, for example, the average value of the most recent times (for example, five times). The mold minimum stop time Ta may be set to an arbitrary value by the user based on experience or the like. The times tb, tc, and td are similarly measured for the molds 80B, 80C, and 80D, and the minimum mold stop times Tb, Tc, and Td are set for each mold.

Furthermore, in the normal molding mode, the injection molding machine 1 measures the time sb from when the mold 80A is moved to the injection station P1 until when the resin material injected into the mold 80B is plasticized. Then, based on the time sb, a plasticization waiting time Sb for the mold 80B is set. The time sb measured immediately before the above-described time capture operation is input to the input device 62 is set to the plasticization waiting time Sb. In addition to this, the plasticization waiting time Sb may be set to, for example, the average value of the most recent times sb (for example, 5 times). The plasticization waiting time Sb may be set to an arbitrary value by the user based on experience or the like. For the molds 80C, 80D, and 80A, the times sc, sd, and sa are similarly measured, and the plasticization waiting times Sc, Sd, and Sa are set for each mold.

FIGS. 6(a) to 6(d) show the molding operation in the skip molding mode.

In the skip molding mode described below as an example, the molding operation is performed using the remaining molds 80A, 80C, and 80D, excluding mold 80B among the molds 80A to 80D used in the normal molding mode. In the following description, a case is described in which the mold 80B is removed from the installation location 15b, but the mold 80B may be installed at the installation location 15b. Of course, in the skip molding mode, the molding operation may be performed with the exception of molds 80 other than mold 80B. Furthermore, the molding operation may be performed without using two or more of the molds 80.

The upper part of FIG. 6 is a plan view schematically showing the positions of the molds 80A, 80C, and 80D, and the position of the installation location 15b of the mold 80B. In the upper diagram of FIG. 6, A, C, and D indicate the molds 80A, 80C, and 80D, and B indicates the installation location 15b of the mold 80B. The diagram at the bottom of Figure 6 schematically shows the operation timings of injection operation (“injection”), plasticization operation (“plasticization”), molded product removal operation (“ejection”), and mold movement operation (“movement”). FIG.

The injection molding machine 1 (specifically, the control device 70) rotates the rotary table 11 and moves the mold 80A to the injection station P1 (mold moving operation). In this state, as shown in FIG. 6(a), there is a mold 80A in the injection station P1, a mold 80D in the first cooling station P2, a mold 80C in the second cooling station P3, and the molded product There is an installation location 15b for the mold 80B at the take-out station P4.

In the state shown in FIG. 6(a), the injection molding machine 1 clamps the mold 80A, moves the injection device 20 downward, and touches the nozzle 21a of the heating cylinder 21 to the upper mold 81A of the mold 80A. Then, the resin material that has already been plasticized for the mold 80A is injected into the mold 80A (injection operation). When the injection operation is finished, the injection molding machine 1 moves the injection device 20 upward to separate the nozzle 21a of the heating cylinder 21 from the upper mold 81A of the mold 80A, and clamps the mold. Release.

The injection molding machine 1 does not perform a molded product ejecting operation in the state shown in FIG. 6(a). Furthermore, the mold 80D and the mold 80C are cooled at the first cooling station P2 and the second cooling station P3.

The injection molding machine 1 stops the rotary table 11 after the minimum mold stop time Ta of the mold 80A has elapsed since the injection operation was completed and the mold 80A was moved to the injection station P1 in the state shown in FIG. 6(a). is rotated to move the installation location 15b of the mold 80B to the injection station P1 (mold moving operation). In this state, as shown in FIG. 6(b), there is an installation location 15b for the mold 80B in the injection station P1, a mold 80A in the first cooling station P2, and a mold 80D in the second cooling station P3. Yes, there is a mold 80C at the molded product removal station P4.

In the state shown in FIG. 6(b), the injection molding machine 1 performs mold clamping as in the case where the mold 80B is at the injection station P1 (actually, there is no mold 80B to be clamped), and the injection molding machine Move 20 downward. Then, after the plasticization waiting time Sc of the mold 80C has elapsed since the installation location 15b of the mold 80B moved to the injection station P1, the resin material to be injected into the mold 80C is plasticized (plasticizing operation). Then, the injection molding machine 1 moves the injection device 20 upward and finishes mold clamping.

In parallel with the above-mentioned plasticizing operation, the injection molding machine 1 moves the upper mold 81C of the mold 80C in the molded product take-out station P4 upward to open the mold 80C, and molds the molded product from the cavity 84C by the ejector device 42. Push out the item. Then, the injection molding machine 1 uses the take-out machine 43 to move the molded product to a molded product conveyance device (not shown), such as a conveyor or a storage container (molded product take-out operation). Furthermore, the mold 80A and the mold 80D are cooled at the first cooling station P2 and the second cooling station P3.

In the injection molding machine 1, the minimum mold stop time Tb of the mold 80B has elapsed since the plasticizing operation was completed and the installation location 15b of the mold 80 was moved to the injection station P1 in the state shown in FIG. 6(b). Thereafter, the rotary table 11 is rotated to move the mold 80C to the injection station P1 (mold moving operation). In this state, as shown in FIG. 6(c), the injection station P1 has the mold 80C, the first cooling station P2 has the installation location 15b of the mold 80B, and the second cooling station P3 has the mold 80A. Yes, there is a mold 80D at the molded product removal station P4. In the state shown in FIG. 6(c), similarly to the state shown in FIG. 5(c), the injection operation for the mold 80C and the plasticizing operation for the mold 80D are performed, and the molded product ejecting operation for the mold 80D is performed. conduct.

When the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product removal operation in the state shown in FIG. 6(c), it rotates the rotary table 11 and moves the mold 80C to the injection station P1 (mold movement movement). In this state, as shown in FIG. 6(d), the mold 80D is located at the injection station P1, the mold 80C is located at the first cooling station P2, and the installation location 15b of the mold 80B is located at the second cooling station P3. Yes, there is a mold 80A at the molded product removal station P4. In the state shown in FIG. 6(d), similarly to the state shown in FIG. 5(d), the injection operation for the mold 80D and the plasticizing operation for the mold 80A are performed, and the molded product ejecting operation for the mold 80A is performed. conduct.

When the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product removal operation in the state shown in FIG. 6(d), it rotates the rotary table 11, moves the mold 80A to the injection station P1, and The state returns to the state shown in 6(a). After that, the above operation is repeated.

As described above, according to the injection molding machine 1 of the present embodiment, there is a normal molding mode in which a molding operation is performed using a plurality of molds 80 installed on the rotary table 11, and a plurality of molds used in the normal molding mode. It has a skip molding mode in which a molding operation is executed using the remaining molds 80 after removing one mold 80 from among the molds 80. Therefore, the skip molding operation can be easily performed by switching from the normal molding mode to the skip molding mode.

It also has an input device 62 into which a switching operation from the normal molding mode to the skip molding mode is input. Therefore, skip molding can be performed more easily.

Further, a rotation drive mechanism 13 that rotates the rotary table 11, an injection device 20 that injects a resin material into a mold 80, a molded product take-out device 40 that takes out a molded product from the mold 80, a rotation drive mechanism 13, an injection device 20 (injection device drive mechanism 23, screw drive mechanism 24), and a control device 70 that controls the molded product take-out device 40 (mold opening/closing device 41, ejector device 42, take-out machine 43). In the molding operation, the control device 70 rotates and drives the plurality of molds 80 installed on the rotary table 11 to move them to an injection station P1, a first cooling station P2, a second cooling station P3, and a molded product removal station P4. The mechanism 13 is controlled. The control device 70 controls the injection device 20 to plasticize the resin material to be injected into the mold 80 and to inject the resin material when the mold 80 moves to the injection station P1. The control device 70 then controls the molded product removal device 40 to take out the molded product from the mold 80 located at the molded product removal station P4. Therefore, the control device 70 can efficiently execute the molding operation by interlocking each drive mechanism.

Further, the plurality of molds 80 include a mold 80A, a mold 80B, and a mold 80C that are sequentially moved to the injection station P1. In the normal molding mode, (i) when the mold 80A is at the injection station P1, the control device 70 controls the injection device to inject the resin material into the mold 80A and plasticize the resin material injected into the mold 80B. (ii) When the mold 80B is at the injection station P1, the injection device 20 is controlled to inject the resin material into the mold 80B and plasticize the resin material injected into the mold 80C. When performing a molding operation excluding the mold 80B in the skip molding mode, (iii) when the mold 80A is at the injection station P1, the control device 70 injects the resin material into the mold 80A, and injects the resin material into the mold 80A. (iv) When the installation location 15b of the mold 80B on the rotary table 11 is at the injection station P1, the resin material is injected into the mold 80C without being injected. The injection device 20 is controlled to plasticize. By doing so, in the skip molding mode excluding the mold 80B, the resin material of the mold 80C can be plasticized at the same timing as in the normal molding mode or at a timing close to that. Therefore, in the normal molding mode and the skip molding mode, it is possible to reduce the difference in thermal history of the resin material due to the difference in the timing of plasticization.

Further, in the skip molding mode, the control device 70 causes the mold 80A to be moved from the injection position after at least the mold minimum stop time Ta of the mold 80A has elapsed since the mold 80A was moved to the injection station P1. The rotation drive mechanism 13 is controlled to. By doing this, by appropriately setting the mold minimum stop time Ta, the time during which the mold 80A is stopped at the injection station P1 can be skipped in the normal molding mode and the molding mode at the same time or at a similar time. can do. Therefore, differences in the thermal history of the resin material due to differences in the timing of plasticization can be reduced.

In addition, in the skip molding mode, the control device 70 controls the installation location of the mold 80B after at least the mold minimum stop time Tb of the mold 80B has passed since the time when the installation location 15b of the mold 80B was moved to the injection station P1. 15b from injection station P1. By doing this, by appropriately setting the mold minimum stop time Tb, the time during which the installation location 15b of the mold 80 is stopped at the injection station P1 can be skipped for the normal molding mode and the molding mode for the same time. Or it can be close to the time. Therefore, differences in the thermal history of the resin material due to differences in the timing of plasticization can be further reduced.

The minimum mold stop time Ta is based on the time ta from when the mold 80A corresponding to the mold minimum stop time Ta moves to the injection station P1 to when it moves from the injection station P1 in the normal molding mode. It is set. Therefore, a more appropriate mold minimum stop time Ta can be set based on the actual time ta. The same applies to the mold minimum stop times Tb, Tc, and Td.

Further, in the skip molding mode, the resin material is injected into the mold 80C after the plasticization waiting time Sc of the mold 80C has elapsed since the time when the control device 70 moved the installation location 15b of the mold 80B to the injection station P1. The injection device 20 is controlled to plasticize. In this way, by appropriately setting the plasticization waiting time Sc, from the time when the installation location 15b of the mold 80B moves to the injection station P1 to the time when the resin material injected into the mold 80C is plasticized. The time can be set to be the same or close to the same time in the normal molding mode and the skip molding mode. Therefore, differences in the thermal history of the resin material due to differences in the timing of plasticization can be reduced.

Furthermore, the plasticization waiting time Sc is set based on the time sc from when the mold 80B moves to the injection station P1 to when the resin material injected into the mold 80C is plasticized in the normal molding mode. Therefore, a more appropriate plasticization waiting time Sb can be set based on the actual time sc. The same applies to the plasticization waiting times Sa, Sc, and Sd.

(Second embodiment)
Hereinafter, an injection molding machine according to a second embodiment of the present invention will be described with reference to FIG.

The injection molding machine according to the second embodiment has the same hardware configuration as the injection molding machine 1 according to the first embodiment described above.

An example of the operation according to the present invention in the injection molding machine of this embodiment will be described with reference to FIGS. 5 and 7.

The molding operation in the normal molding mode of the injection molding machine of this embodiment is the same as the normal molding mode (FIG. 5) of the injection molding machine 1 of the first embodiment described above.

FIGS. 7(a) to (d) show the molding operation in the skip molding mode.

In the skip molding mode described below as an example, the molding operation is performed using the remaining molds 80A, 80C, and 80D, excluding mold 80B among the molds 80A to 80D used in the normal molding mode. In the following description, a case is described in which a mold substitute device 86 is installed at the installation location 15b instead of the mold 80B, but the mold 80B may also be installed at the installation location 15b. The mold replacement device 86 is configured, for example, with a container that receives the resin material injected by the injection device 20. Of course, in the skip molding mode, the molding operation may be performed with the exception of molds other than mold 80B.

The upper part of FIG. 7 is a plan view schematically showing the positions of the molds 80A, 80C, and 80D, and the position of the mold replacement device 86. In the upper diagram of FIG. 7, A, C, and D indicate the molds 80A, 80C, and 80D, and B indicates the mold replacement device 86. The diagram at the bottom of Figure 7 schematically shows the operation timings of injection operation (“injection”), plasticization operation (“plasticization”), molded product removal operation (“ejection”), and mold movement operation (“movement”). FIG.

The injection molding machine 1 (specifically, the control device 70) rotates the rotary table 11 and moves the mold 80A to the injection station P1 (mold moving operation). In this state, as shown in FIG. 7(a), there is a mold 80A in the injection station P1, a mold 80D in the first cooling station P2, a mold 80C in the second cooling station P3, and the molded product There is a mold replacement device 86 at the take-out station P4.

In the state shown in FIG. 7(a), the injection molding machine 1 operates under the same conditions as the injection operation for the mold 80A and the plasticizing operation performed for the mold 80B, as in the state shown in FIG. 5(a). Performs plasticizing action.

In parallel with the above-mentioned injection operation and plasticizing operation, the injection molding machine 1 takes out the resin material from the mold replacement device 86 in the molded product removal station P4 and moves it to a molded product disposal section such as a waste resin storage container. (molded product disposal operation). Furthermore, the mold 80D and the mold 80C are cooled at the first cooling station P2 and the second cooling station P3.

When the injection molding machine 1 finishes the injection operation, plasticization operation, and molded product disposal operation in the state shown in FIG. 7(a), it rotates the rotary table 11 and moves the mold replacement device 86 to the injection station P1 ( mold movement movement). In this state, as shown in FIG. 7(b), there is a mold replacement device 86 in the injection station P1, a mold 80A in the first cooling station P2, a mold 80D in the second cooling station P3, There is a mold 80C at the molded product removal station P4.

In the state shown in FIG. 7(b), the injection molding machine 1 executes the injection operation for the mold replacement device 86 and the plasticizing operation for the mold 80C, as in the state shown in FIG. 5(b). Then, the molded product is removed from the mold 80C. In this injection operation, the resin material is injected into the mold replacement device 86, resulting in a so-called "throw away" operation.

When the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product removal operation in the state shown in FIG. 7(b), it rotates the rotary table 11 and moves the mold 80C to the injection station P1 (mold movement movement). In this state, as shown in FIG. 7(c), there is a mold 80C in the injection station P1, a mold substitute device 86 in the first cooling station P2, and a mold 80A in the second cooling station P3. A mold 80D is located at the molded product removal station P4. In the state shown in FIG. 7(c), similarly to the state shown in FIG. 5(c), the injection operation for the mold 80C and the plasticizing operation for the mold 80D are performed, and the molded product ejecting operation for the mold 80D is performed. conduct.

When the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product removal operation in the state shown in FIG. 7(c), it rotates the rotary table 11 and moves the mold 80D to the injection station P1 (mold movement movement). In this state, as shown in FIG. 7(d), there is a mold 80D in the injection station P1, a mold 80C in the first cooling station P2, a mold replacement device 86 in the second cooling station P3, A mold 80A is located at the molded product removal station P4. In the state shown in FIG. 7(d), similarly to the state shown in FIG. 5(d), the injection operation for the mold 80D and the plasticizing operation for the mold 80A are performed, and the molded product ejecting operation for the mold 80A is performed. conduct.

When the injection molding machine 1 finishes the injection operation, plasticizing operation, and molded product removal operation in the state shown in FIG. 7(d), it rotates the rotary table 11, moves the mold 80A to the injection station P1, and The state returns to the state shown in 7(a). After that, the above operation is repeated.

The injection molding machine of this embodiment has the same effects as the injection molding machine 1 of the first embodiment described above.

In each of the embodiments described above, the molded product removal operation ends earlier than the plasticizing operation, but the present invention is not limited to this, and the molded product removal operation may end later than the plasticizing operation. There may be. In such a configuration, the minimum mold stop time is the time corresponding to the end of the molded product ejecting operation.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. The present invention may include additions, deletions, or design changes to the above-described embodiments by those skilled in the art as appropriate, or combinations of features of the embodiments as appropriate, as long as they do not go against the spirit of the present invention. included in the range.

DESCRIPTION OF SYMBOLS 1... Injection molding machine, 10... Mold clamping device, 11... Rotary table, 11a... Top surface, 12... Movable die plate, 12a... Through hole, 13... Rotation drive mechanism, 14... Mold clamping drive mechanism, 15a, 15b, 15c , 15d... Installation location, 20... Injection device, 21... Heating cylinder, 21a... Nozzle, 22... Screw, 23... Injection device drive mechanism, 24... Screw drive mechanism, 40... Molded product removal device, 41... Mold opening/closing device , 42... Ejector device, 43... Takeout machine, 60... Display input device, 61... Display device, 62... Input device, 70... Control device, 80, 80A, 80B, 80C, 80D... Mold, 81... Upper mold , 82...Lower mold, 84...Cavity, 85...Resin channel, 86...Mold replacement device, P1...Injection station, P2...First cooling station, P3...Second cooling station, P4... Molded product removal station , Sa, Sb, Sc, Sc...Plasticization waiting time, Ta, Tb, Tc, Td...Mold minimum stop time

Claims (9)

An injection molding machine having a rotary table on which a plurality of molds are installed,
a rotational drive mechanism that rotates the rotary table;
an injection device that injects a resin material into the mold;
a molded product removal device that takes out the molded product from the mold;
a control device that controls the rotational drive mechanism, the injection device, and the molded product ejecting device;
The control device, in the molding operation,
controlling the rotational drive mechanism to move the plurality of molds installed on the rotary table to an injection position and a molded product removal position;
controlling the injection device to plasticize the resin material to be injected into the mold and inject it when the mold moves to the injection position;
controlling the molded product removal device to take out the molded product from the mold at the molded product removal position;
The plurality of molds include mold A, mold B, and mold C that are sequentially moved to the injection position,
The control device includes:
When performing the molding operation using the plurality of molds (hereinafter referred to as "normal molding mode") ,
When the mold A is at the injection position, controlling the injection device to inject a resin material into the mold A and plasticize the resin material injected into the mold B;
When the mold B is at the injection position, controlling the injection device to inject a resin material into the mold B and plasticize the resin material injected into the mold C;
When performing the molding operation using the molds remaining after removing mold B from the plurality of molds (hereinafter referred to as "skip molding mode ") ,
When the mold A is at the injection position, injecting the resin material into the mold A and controlling the injection device so as not to plasticize the resin material;
When the installation location of the mold B on the rotary table is at the injection position, the injection device is controlled so as not to inject the resin material but to plasticize the resin material injected into the mold C. Characteristic injection molding machine. The injection molding machine according to claim 1, further comprising an input device for inputting a switching operation from the normal molding mode to the skip molding mode. In the skip molding mode, the control device moves the mold A from the injection position after at least a minimum mold stop time of the mold A has elapsed since the mold A was moved to the injection position. The injection molding machine according to claim 1 or 2 , wherein the rotational drive mechanism is controlled so as to. In the skip molding mode, after at least the minimum mold stop time of the mold B has elapsed since the time when the control device moved the installation location of the mold B to the injection position, the installation location of the mold B is The injection molding machine according to any one of claims 1 to 3 , wherein the rotational drive mechanism is controlled to move the injection molding machine from the injection position. The mold minimum stop time is set based on the time from when the mold corresponding to the mold minimum stop time moves to the injection position to when it moves from the injection position in the normal molding mode. The injection molding machine according to claim 3 or claim 4 . In the skip molding mode, the resin material is injected into the mold C after the plasticization waiting time of the mold C has elapsed from the time when the control device moved the installation location of the mold B to the injection position. The injection molding machine according to any one of claims 1 to 5 , wherein the injection device is controlled to plasticize. The plasticization waiting time of the mold C is set based on the time from when the mold B moves to the injection position in the normal molding mode to when the resin material injected into the mold C is plasticized. The injection molding machine according to claim 6 , wherein the injection molding machine is An injection molding machine having a rotary table on which a plurality of molds are installed,
a rotational drive mechanism that rotates the rotary table;
an injection device that injects a resin material into the mold;
a molded product removal device that takes out the molded product from the mold;
a control device that controls the rotational drive mechanism, the injection device, and the molded product ejecting device;
The control device, in the molding operation,
controlling the rotational drive mechanism to move the plurality of molds installed on the rotary table to an injection position and a molded product removal position;
controlling the injection device to plasticize the resin material to be injected into the mold and inject it when the mold moves to the injection position;
controlling the molded product removal device to take out the molded product from the mold at the molded product removal position;
The plurality of molds include mold A, mold B, and mold C that are sequentially moved to the injection position,
The control device includes:
When performing the molding operation using the plurality of molds (hereinafter referred to as "normal molding mode") ,
When the mold A is at the injection position, controlling the injection device to inject a resin material into the mold A and plasticize the resin material injected into the mold B;
When the mold B is at the injection position, controlling the injection device to inject a resin material into the mold B and plasticize the resin material injected into the mold C;
When the mold A is at the molded product removal position, controlling the molded product removal device to take out the molded product from the mold A;
When the mold B is at the molded product removal position, controlling the molded product removal device to take out the molded product from the mold B;
When performing the molding operation using the molds remaining after removing mold B from the plurality of molds (hereinafter referred to as "skip molding mode ") ,
When the mold A is at the injection position, controlling the injection device to inject a resin material into the mold A and plasticize the resin material injected into the mold B;
When the mold B is at the injection position, controlling the injection device to inject a resin material into the mold B and plasticize the resin material injected into the mold C;
When the mold A is at the molded product removal position, controlling the molded product removal device to take out the molded product from the mold A;
An injection molding machine characterized in that when the mold B is at the molded product ejecting position, the molded product ejecting device is controlled so as to discard the resin material injected into the mold B. The injection molding machine according to claim 8 , wherein in the skip molding mode, a mold substitute device is installed in the rotary table in place of the mold B.

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