Injection molding machine and its control method

Abstract

The present invention provides an injection molding machine and a control method for the injection molding machine that can shorten the molding cycle and more reliably prevent nozzle contact before the mold is closed. [Solution] In the molding operation, the injection device 20 is advanced toward a target position where the nozzle 21a contacts the movable mold 4. When the injection device 20 has advanced to a determination position that is in front of the target position, (i) if the fixed mold 3 and the movable mold 4 are closed, the injection device 20 is advanced further toward the target position, and (ii) if the fixed mold 3 and the movable mold 4 are not closed, the advance of the injection device 20 is stopped, and after the fixed mold 3 and the movable mold 4 have closed, the injection device 20 is advanced further toward the target position.

Description

Technical Field

[0001] The present invention relates to an injection molding machine and a control method thereof.

Background Art

[0002] Patent Document 1 discloses an example of a conventional injection molding machine. This injection molding machine advances the injection unit so that nozzle touch completion occurs simultaneously with mold clamping completion based on the mold clamping time from the start of mold closing to the completion of mold clamping and the injection unit retreat time. Thereby, the mold clamping operation and the injection unit forward movement are performed in parallel, and the molding cycle can be shortened.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above - described injection molding machine, for example, due to expansion caused by heating of a mold or a die plate, there is a possibility of nozzle touch before mold clamping completion, and there is a risk of damage to the mold or the injection unit.

[0005] Therefore, an object of the present invention is to provide an injection molding machine and a control method for an injection molding machine that can shorten the molding cycle and more reliably suppress nozzle touch before closing the mold.

Means for Solving the Problems

[0006] <00...... To achieve the above object, an injection molding machine according to an aspect of the present invention is An injection molding machine comprising: a clamping device for clamping a first mold and a second mold; an injection device having a cylinder equipped with a nozzle that moves toward and away from at least one of the first mold and the second mold; and a control device for controlling the clamping device and the injection device, The control device, in the molding operation, The injection device is advanced toward a target position where the nozzle contacts the mold. When the injection device moves forward to a determination position that is in front of the target position, it is determined whether the first mold and the second mold are closed. (i) When the first mold and the second mold are closed, the injection device is further advanced to the target position. (ii) When the first mold and the second mold are not closed, the forward movement of the injection device is stopped, and after the first mold and the second mold are closed, the injection device is further advanced to the target position.

[0007] To achieve the above objective, a control method for an injection molding machine according to another aspect of the present invention is: A control method for an injection molding machine having a clamping device for clamping a first mold and a second mold, and an injection device having a cylinder equipped with a nozzle that moves toward and away from at least one of the first mold and the second mold, In the molding process, The injection device is advanced toward a target position where the nozzle contacts the mold. When the injection device moves forward to a determination position that is in front of the target position, (i) When the first mold and the second mold are closed, the injection device is further advanced to the target position. (ii) When the first mold and the second mold are not closed, the forward movement of the injection device is stopped, and after the first mold and the second mold are closed, the injection device is further advanced to the target position. [Effects of the Invention]

[0008] According to the present invention, if the first mold and the second mold are closed while the injection device is advancing toward a target position where the nozzle contacts at least one of the first mold and the second mold, the injection device is advanced to the target position. If they are not closed, the device waits until the first mold and the second mold are closed before advancing the injection device to the target position. In this way, when the operation of closing the first mold and the second mold and the operation of advancing the injection device are performed in parallel, it is possible to suppress the nozzle contacting the mold before the first mold and the second mold are closed. Therefore, the molding cycle can be shortened, and nozzle contact before the first mold and the second mold are closed can be suppressed more reliably. [Brief explanation of the drawing]

[0009] [Figure 1] This is a front view of the molding system according to the first embodiment of the present invention. [Figure 2] Figure 1 is a plan view of the molding system. [Figure 3] Figure 1 shows a cross-sectional view of the mold clamping device and its vicinity in the molding system (with the fixed mold and movable mold in the open position). [Figure 4] Figure 1 shows a cross-sectional view of the mold clamping device and its vicinity in the molding system (with the fixed mold and movable mold closed). [Figure 5] Figure 1 is a functional block diagram of the molding system. [Figure 6] This diagram illustrates the operation of the molding system shown in Figure 1 (Operation Example 1). [Figure 7] This diagram illustrates the operation of the molding system shown in Figure 1 (Operation Example 2). [Figure 8] This is a diagram illustrating the operation of a conventional molding system. [Figure 9] This is a front view of a molding system according to a second embodiment of the present invention. [Figure 10] This diagram illustrates the operation of the molding system shown in Figure 9 (Operation Example 3). [Figure 11] Figure 9 is a schematic plan view showing the positional relationship between the fixed mold on the rotary table of the molding system and the nozzle of the injection device.

Mode for Carrying Out the Invention

[0010] <First Embodiment> Hereinafter, a molding system according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 8.

[0011] The molding system 1 according to the present embodiment is used to produce a product 200, which is a molded product, by injecting and filling resin into a cavity C formed by a fixed mold 3 and a movable mold 4.

[0012] As shown in FIGS. 1 and 2, the molding system 1 has an automatic machine 5 and an injection molding machine 7.

[0013] The automatic machine 5 has a transfer arm and is used for moving the product 200. The automatic machine 5 is arranged in the vicinity of the injection molding machine 7.

[0014] The injection molding machine 7 opens and closes the fixed mold 3 and the movable mold 4 in the vertical direction and injects resin from above downward (vertical clamping, vertical injection). The injection molding machine 7 has a clamping device 10, an injection device 20, an ejector device 30, and a control device 70.

[0015] As shown in FIGS. 3 to 5, the clamping device 10 has a rotary table 11, a movable die plate 12, a tailstock 13, a plurality of tie bars 14, a rotational drive mechanism 15, and a toggle link mechanism 17.

[0016] The rotary table 11 has a disk shape and is horizontally and rotatably arranged on a base 9 supported by a frame 8. Two fixed molds 3 are attached to the rotary table 11 at an interval of 180 degrees. The rotary table 11 is rotated by the rotational drive mechanism 15, and the two fixed molds 3 are alternately positioned at a first station S1 (right position in FIGS. 1 and 2) and a second station S2 (left position in FIGS. 1 and 2). The base 9 and the rotary table 11 are fixed die plates.

[0017] The first station S1 is the injection position for clamping the fixed mold 3 and the movable mold 4 together and injecting and filling the plasticized resin into the cavity C. The second station S2 is the molded product removal position for removing the product 200 from the fixed mold 3.

[0018] The movable die plate 12 is positioned above the rotary table 11. The movable die plate 12 is movable in the vertical direction. The vertical direction is the clamping direction. The movable die plate 12 is provided with a through hole 12a.

[0019] A movable die plate 12 is fitted with a movable mold 4. The movable mold 4 is provided with a resin flow path 4a (sprue, runner, gate) leading to the cavity C. The movable mold 4 faces the fixed mold 3, which is positioned at the first station S1, in the vertical direction. The fixed mold 3 is the first mold, and the movable mold 4 is the second mold.

[0020] The tailstock 13 is positioned below the base 9 so as to be movable in the vertical direction. Multiple tie bars 14 extend vertically through the base 9 and connect the movable die plate 12 to the tailstock 13.

[0021] The toggle link mechanism 17 is located between the base 9 and the tailstock 13. The toggle link mechanism 17 bends as shown in Figure 3 and extends as shown in Figure 4.

[0022] When the toggle link mechanism 17 bends, the gap between the rotary table 11 and the movable die plate 12 increases, causing the movable mold 4 to move away from the fixed mold 3, and the fixed mold 3 and the movable mold 4 to open up (mold open state).

[0023] When the toggle link mechanism 17 extends, the gap between the rotary table 11 and the movable die plate 12 decreases, causing the movable mold 4 to come into contact with the fixed mold 3, and the fixed mold 3 and the movable mold 4 close together (closed mold state). When the extension of the toggle link mechanism 17 is complete, the fixed mold 3 and the movable mold 4 are clamped together with a predetermined clamping force (clamped state).

[0024] The injection device 20 is positioned above the movable die plate 12. The injection device 20 includes a cylinder 21, a screw 22, an injection device drive mechanism 23, and a screw drive mechanism 24.

[0025] The cylinder 21 has a cylindrical shape, and a heater (not shown) is arranged on its outer surface. The cylinder 21 heats the resin. A nozzle 21a is provided at the tip (lower end) of the cylinder 21. The nozzle 21a is inserted into the through hole 12a of the movable die plate 12, contacts the movable mold 4 (nozzle touch), and is connected to the resin flow path 4a of the movable mold 4. The resin plasticized in the cylinder 21 flows through the nozzle 21a and the resin flow path 4a to the cavity C.

[0026] The screw 22 is located inside the cylinder 21. The screw 22 is rotatable and movable in the vertical direction.

[0027] The injection device drive mechanism 23 moves the injection device 20 vertically relative to the movable die plate 12. As the injection device 20 moves vertically, the nozzle 21a moves away from and into the movable mold 4. The screw drive mechanism 24 rotates and moves the screw 22 vertically within the cylinder 21. Moving the injection device 20 and screw 22 toward the movable mold 4 (downward) is called "advancing," and moving them toward the movable mold 4 (upward) is called "retracting."

[0028] The ejector device 30 moves an ejector pin (not shown) provided on the fixed mold 3 in the vertical direction. When the ejector pin protrudes from the outer surface of the fixed mold 3, the product 200 is separated from the fixed mold 3. Moving the ejector pin in the direction of protruding from the outer surface of the fixed mold 3 (upward) is called "advancing," and moving the ejector pin in the direction of housing it in the fixed mold 3 (downward) is called "retracting." The automatic machine 5 moves the product 200 separated from the fixed mold 3 to a predetermined location.

[0029] The control device 70 controls the operation of the entire molding system 1. The control device 70 has a microcomputer and a memory unit. The control device 70 controls the automatic machine 5, the clamping device 10 (rotary drive mechanism 15, toggle link mechanism 17), the injection device 20 (injection device drive mechanism 23, screw drive mechanism 24), and the ejector device 30.

[0030] <Example of operation 1> An example of the molding operation of product 200 in molding system 1 (operation example 1) will be explained with reference to Figure 6.

[0031] The memory unit of the control device 70 stores the target position Pt and the determination position Pd, which are used when the injection device 20 moves forward (nozzle advances) during the molding operation. The target position Pt is the position where the nozzle 21a contacts the movable mold 4. The determination position Pd is located in front of (behind) the target position Pt. The determination position Pd is set considering deformation due to heating of the movable mold 4 and the movable die plate 12. For example, when the determination position Pd is 5 mm behind the target position Pt, "5 mm" is set for the determination position Pd. The value set for the determination position Pd can be changed by the operator.

[0032] Operation Example 1 includes the following operations (1) to (12). Operations (1) to (12) are performed in one molding cycle. Operation (1) is common to both the first station S1 and the second station S2. Operations (2) to (9) are operations performed at the first station S1. Operations (10) to (12) are operations performed at the second station S2.

[0033] (1) "Table rotation" When the control device 70 confirms that the toggle link mechanism 17 is bent and that the fixed mold 3 and the movable mold 4, which are positioned at the first station S1, are in the open state, it rotates the rotary table 11 by 180 degrees. As a result, one of the fixed molds 3 moves from the first station S1 to the second station S2, and the other fixed mold 3 moves from the second station S2 to the first station S1. The fixed mold 3 that has moved from the first station S1 to the second station S2 has the product 200 placed on it.

[0034] (2) “Mold closing” When the fixed mold 3 is positioned at the first station S1, the control device 70 starts extending the toggle link mechanism 17. The time at which the toggle link mechanism 17 starts to extend is defined as the mold closing start time Tc.

[0035] (3) "Nozzle forward 1" The control device 70 starts the injection device 20 moving forward at the mold closing start time Tc. When the injection device 20 moves forward and reaches the determination position Pd, the control device 70 determines whether the fixed mold 3 and the movable mold 4 are in a closed state. In this example of operation, the mold is not closed at the time of determination, so the control device 70 stops the injection device 20 from moving forward and monitors the state of the fixed mold 3 and the movable mold 4. If the mold is closed at the time of determination, the control device 70 proceeds to operation (4) without stopping the injection device 20 from moving forward and moves the injection device 20 to the target position Pt. The control device 70 may determine whether the fixed mold 3 and the movable mold 4 are in a clamped state instead of a closed state. That is, the control device 70 may determine the clamped state as a state in which the fixed mold 3 and the movable mold 4 are closed.

[0036] (4) "Nozzle advance 2" When the fixed mold 3 and the movable mold 4 are in the closed position, the control device 70 restarts the forward movement of the injection device 20, advancing it to the target position Pt. As a result, the nozzle 21a of the injection device 20 comes into contact with the movable mold 4 and connects to the resin flow path 4a. At the same time, the fixed mold 3 and the movable mold 4 are clamped together.

[0037] (5) “Injection” The control device 70 advances the screw 22 to inject the plasticized resin in the cylinder 21 into the cavity C.

[0038] (6) "Pressure retention" The control device 70 controls the front-rear position of the screw 22 so that a predetermined pressure (holding pressure) is applied to the resin filled in the cavity C.

[0039] (7) “Plasticization” When the resin in the resin channel 4a (gate) solidifies, the control device 70 rotates the screw 22 to plasticize the resin and send it to the front part of the cylinder 21. This causes the screw 22 to retract.

[0040] (8) "Nozzle retraction" The control device 70 retracts the injection device 20 to a predetermined retracted position. This causes the nozzle 21a to move away from the movable mold 4.

[0041] (9) “Mold opening” When a predetermined cooling time has elapsed since the completion of operation (6) "holding pressure", the control device 70 starts bending the toggle link mechanism 17. As a result, the movable mold 4 separates from the fixed mold 3, and once the bending of the toggle link mechanism 17 is complete, the fixed mold 3 and the movable mold 4 enter the open state, and the operation at the first station S1 is completed.

[0042] (10) "Ejector forward" When the stationary mold 3 on which the product 200 is placed is positioned at the second station S2, the control device 70 causes the ejector pin (not shown) to protrude (advance) from the outer surface of the stationary mold 3, thereby separating the product 200 from the stationary mold 3.

[0043] (11) "Ejector retraction" The control device 70 retracts the ejector pin into the fixed mold 3.

[0044] (12) "Product removal" The control device 70 moves the product 200, separated from the fixed mold 3, to a predetermined location using the automated machine 5. Once the movement of the product 200 is complete, the operation at the second station S2 is completed.

[0045] Once operations (2) to (9) at the first station S1 and operations (10) to (12) at the second station S2 are both completed, the control device 70 returns to operation (1) and thereafter repeats operations (1) to (12).

[0046] <Example of operation 2> Another example of the molding operation of product 200 in molding system 1 (operation example 2) will be explained with reference to Figure 7.

[0047] The memory unit of the control device 70 stores the target position Pt and the determination position Pd, as well as the forward start adjustment time Ts. The forward start adjustment time Ts is the time used to adjust the time when the injection device 20 starts moving forward, with the mold closing start time Tc as the reference (time 0). For example, when the injection device 20 starts moving forward 5 seconds after the mold closing start time Tc, the forward start adjustment time Ts is set to "5 seconds". When the injection device 20 starts moving forward 2 seconds before the mold closing start time Tc, the forward start adjustment time Ts is set to "-2 seconds". The value set for the forward start adjustment time Ts can be changed by the operator.

[0048] Operation Example 2 is the same as Operation Example 1, except that it includes operation (3') "nozzle advance" instead of operations (3) "nozzle advance 1" and (4) "nozzle advance 2" described above. In other words, Operation Example 2 includes operations (1), (2), (3'), and (5) to (12). For Operation Example 2, only the operation that differs from Operation Example 1 (operation (3')) will be explained.

[0049] (3') "Nozzle forward" The control device 70 starts the injection device 20 to move forward at a time obtained from the mold closing start time Tc and the forward movement start adjustment time Ts. When the injection device 20 moves forward and reaches the determination position Pd, the control device 70 determines whether the fixed mold 3 and the movable mold 4 are in a closed state. In this example of operation, since the mold is closed at the time of determination, the control device 70 does not stop the injection device 20 from moving forward, but moves the injection device 20 to the target position Pt. As a result, the nozzle 21a of the injection device 20 comes into contact with the movable mold 4 and is connected to the resin flow path 4a of the movable mold 4. Also, the fixed mold 3 and the movable mold 4 are in a clamped state. If the mold is not closed at the time of determination, the control device 70 performs the operations (3) and (4) described above, as in Example 1. The control device 70 may determine whether the fixed mold 3 and the movable mold 4 are in a clamped state instead of the mold closed state.

[0050] <Example of conventional operation> Figure 8 shows an example of a conventional molding operation of product 200 in molding system 1 (conventional operation example). The conventional operation example is the same as operation example 1 except that it includes operation (3#) "nozzle advance" instead of operation (3) "nozzle advance 1" and operation (4) "nozzle advance 2" described above.

[0051] In the conventional operation example, operation (3#) "nozzle advancement" is started after operation (2) "mold closing" is completed. In operation (3#), the control device 70 advances the injection device 20 to the target position Pt without determining whether the fixed mold 3 and the movable mold 4 are in the mold closed state. Therefore, in the conventional operation example, the operation of closing the fixed mold 3 and the movable mold 4 and the operation of advancing the injection device 20 are performed in sequence, so the time required for the molding operation is longer compared to operation examples 1 and 2, in which these operations are performed in parallel.

[0052] As described above, the injection molding machine 7 of the molding system 1 includes a clamping device 10 that clamps the fixed mold 3 and the movable mold 4, an injection device 20 having a cylinder 21 equipped with a nozzle 21a that moves toward and toward the movable mold 4, and a control device 70 that controls the clamping device 10 and the injection device 20. In the molding operation for molding the product 200, the control device 70 advances the injection device 20 toward a target position Pt where the nozzle 21a makes contact with the movable mold 4. When the injection device 20 has advanced to a determination position Pd which is before the target position Pt, the control device 70 determines whether the fixed mold 3 and the movable mold 4 are closed (mold closed state). If the fixed mold 3 and the movable mold 4 are closed, the control device 70 advances the injection device 20 further toward the target position Pt. The control device 70 stops the injection device 20 from moving forward when the fixed mold 3 and the movable mold 4 are not closed, and then moves the injection device 20 further forward to the target position Pt after the fixed mold 3 and the movable mold 4 have closed.

[0053] As a result, when the closing operation of the fixed mold 3 and the movable mold 4 and the forward operation of the injection device 20 are performed in parallel, it is possible to suppress the nozzle 21a from contacting the fixed mold 3 before the fixed mold 3 and the movable mold 4 are closed. Therefore, the molding cycle can be shortened, and nozzle contact before the fixed mold 3 and the movable mold 4 are closed can be suppressed more reliably.

[0054] Furthermore, in operation example 2, the forward start adjustment time Ts is stored in the memory of the control device 70. The control device 70 starts the forward movement of the injection device 20 based on the mold closing start time Tc, when the operation to close the fixed mold 3 and the movable mold 4 begins, and the forward start adjustment time Ts. By doing this, the relationship between the operation to close the fixed mold 3 and the movable mold 4 and the operation to move the injection device 20 forward can be optimized by adjusting the determination position Pd and the forward start adjustment time Ts, thereby further shortening the molding cycle.

[0055] <Second Example> The molding system according to the second embodiment of the present invention will be described below with reference to Figures 9 to 11.

[0056] The molding system 2 according to this embodiment, like the molding system 1 described above, is used to produce a molded product 200 by injecting and filling resin into a cavity C formed by a fixed mold 3 and a movable mold 4. In the following description, the same reference numerals are used for components that are the same as those in the molding system 1 (including components that are substantially the same), and detailed descriptions are omitted.

[0057] As shown in Figure 9, the molding system 1 includes an automatic machine 5 and an injection molding machine 7A.

[0058] The injection molding machine 7A opens and closes the fixed mold 3 and the movable mold 4 in the vertical direction, injecting resin from right to left in Figure 9 (vertical clamping, horizontal injection). The injection molding machine 7A includes a clamping device 10, an injection device 20A, an ejector device 30, and a control device 70.

[0059] The injection device 20A is positioned above the base 9 and is movable laterally (horizontally) in Figure 9. The injection device 20A includes a cylinder 21, a screw 22, an injection device drive mechanism 23, and a screw drive mechanism 24.

[0060] The injection device drive mechanism 23 moves the injection device 20A laterally. As the injection device 20A moves laterally, the nozzle 21a moves away from or into contact with the fixed mold 3 and the movable mold 4. Moving the injection device 20A toward the fixed mold 3 (to the left in Figures 9 and 11) is called "advancing," and moving it toward the fixed mold 3 (to the right in Figures 9 and 11) is called "retracting."

[0061] The injection molding machine 7A has the same configuration (including substantially the same configuration) as the injection molding machine 7 described above, except that it has an injection device 20A that injects in the horizontal direction instead of an injection device 20 that injects in the vertical direction.

[0062] <Example of operation 3> An example of the molding operation of product 200 in molding system 2 (operation example 3) will be explained with reference to Figures 10 and 11.

[0063] The memory unit of the control device 70 stores the target position Pt and the determination position Pd, as well as the closest approach time Tn. In this embodiment, the target position Pt is the position where the nozzle 21a contacts the fixed mold 3 and the movable mold 4. The closest approach time Tn is the time when the fixed mold 3, which is being moved toward the first station S1 by the rotation of the rotary table 11, comes closest to the nozzle 21a of the injection device 20. The closest approach time Tn is set, for example, with the time when the rotation of the rotary table 11 begins as the reference (time 0).

[0064] In this embodiment, when the corner of the rectangular fixed mold 3 passes in front of the nozzle 21a, the distance L between the fixed mold 3 and the nozzle 21a is shortest, and the fixed mold 3 comes closest to the nozzle 21a of the injection device 20. Figure 11 schematically shows the positional relationship between the fixed molds 3 (3A, 3B) on the rotary table 11 of the molding system 2 and the nozzle 21a of the injection device 20. In Figure 11, the rotary table 11 is rotating clockwise, the fixed mold 3A is moving toward the first station S1, and the fixed mold 3B is moving toward the second station S2. Figure 11 shows the state in which the distance L between the fixed mold 3A and the nozzle 21a is shortest.

[0065] Operation Example 3 is the same as Operation Example 1, except that it includes operation (3) "nozzle forward" instead of operation (3) "nozzle forward" as described above. In other words, Operation Example 3 includes operations (1), (2), (3)), and (4) to (12). For Operation Example 3, only the operation that differs from Operation Example 1 (operation (3)) will be explained.

[0066] (3) "Nozzle advance 1" The control device 70 starts the injection device 20 moving forward at the closest approach time Tn. When the injection device 20 moves forward and reaches the determination position Pd, the control device 70 determines whether the fixed mold 3 and the movable mold 4 are in a closed state. In this example of operation, since the molds are not closed at the time of determination, the control device 70 stops the injection device 20 from moving forward and monitors the state of the fixed mold 3 and the movable mold 4. If the molds are closed at the time of determination, the control device 70 proceeds to operation (4) without stopping the injection device 20 from moving forward and moves the injection device 20 to the target position Pt. The control device 70 may also determine whether the fixed mold 3 and the movable mold 4 are in a clamped state instead of a closed state.

[0067] Molding system 2 produces the same effects as molding system 1.

[0068] Furthermore, in the molding system 2, the injection device 20 moves forward and backward in the horizontal direction. The clamping device 10 has a rotary table 11 on which multiple fixed molds 3 are installed and which rotates intermittently to sequentially position the multiple fixed molds 3 at the first station S1 where they are clamped vertically to the movable mold 4. The control device 70 rotates the rotary table 11 to sequentially move the multiple fixed molds 3 to the first station S1 where they are clamped to the movable mold 4. The control device 70 starts the injection device 20 to move forward when the fixed molds 3 moving toward the first station S1 are closest to the nozzle 21a. In this way, the control device 70 starts the injection device 20 to move forward after the fixed molds 3 moving toward the first station S1 have passed the position where they are most likely to collide with the nozzle 21a. Therefore, the injection device 20 can start moving forward at an earlier time while suppressing collisions between the moving fixed molds 3 and the nozzle 21a.

[0069] In addition, in the molding system 2, the control device 70 may, instead of the closest approach time Tn, start the injection device 20 moving forward when the stationary mold 3 (3A) being moved toward the first station S1 approaches the first station S1 and the rotational speed of the rotary table 11 begins to decrease.

[0070] In molding systems 1 and 2, the fixed mold 3 is placed on a rotary table 11. However, instead of the rotary table 11, for example, a slide table that slides horizontally in Figure 1 may be provided, and the fixed mold 3 may be placed on the slide table to position the fixed mold 3 at the first station S1 and the second station S2. Alternatively, a fixed die plate may be provided that faces the movable die plate 12 in the vertical direction, and the fixed mold 3 may be placed on the fixed die plate so that the fixed mold 3 always faces the movable mold 4 in the vertical direction.

[0071] While molding systems 1 and 2 open and close the fixed mold 3 and the movable mold 4 in the vertical direction, they may also open and close the fixed mold 3 and the movable mold 4 in the horizontal direction (horizontal clamping).

[0072] Although embodiments of the present invention have been described above, the present invention is not limited to these examples. Additions, deletions, and design modifications of components, or combinations of features of the embodiments as appropriate by those skilled in the art, are also included within the scope of the present invention, as long as they do not contradict the spirit of the invention. [Explanation of symbols]

[0073] 1, 2... Molding system, 3... Fixed mold, 4... Movable mold, C... Cavity 5...Automatic machine, 7, 7A...Injection molding machine, 10…Clip clamping device, 11…Rotary table, 12…Movable die plate, 20, 20A... Injection device, 21... Cylinder, 21a... Nozzle, 22... Screw, 70... Control device,

Claims

1. An injection molding machine comprising: a clamping device for clamping a first mold and a second mold; an injection device having a cylinder equipped with a nozzle that moves toward and away from at least one of the first mold and the second mold; and a control device for controlling the clamping device and the injection device, The control device, in the molding operation, The injection device is advanced toward a target position where the nozzle contacts the mold. When the injection device moves forward to a determination position that is in front of the target position, it is determined whether the first mold and the second mold are closed. (i) When the first mold and the second mold are closed, the injection device is further advanced to the target position. (ii) An injection molding machine characterized in that, when the first mold and the second mold are not closed, the forward movement of the injection device is stopped, and after the first mold and the second mold are closed, the injection device is further advanced to the target position.

2. The control device, It has a memory unit that stores the forward start adjustment time, The injection molding machine according to claim 1, wherein the forward movement of the injection device is started based on the time at which the operation of closing the first mold and the second mold is started and the forward movement start adjustment time.

3. The injection device moves forward and backward in the horizontal direction. The clamping device has a rotary table on which a plurality of first molds are installed and which is intermittently rotated to sequentially position the plurality of first molds in a station where they are clamped perpendicular to the second mold. The control device, The rotary table is rotated to sequentially move the multiple first molds to the station where they are clamped together with the second mold. The injection molding machine according to claim 1, wherein the injection device starts moving forward when the first mold, which is being moved toward the station, is closest to the nozzle.

4. The injection device moves forward and backward in the horizontal direction. The clamping device has a rotary table on which a plurality of first molds are installed and which is intermittently rotated to sequentially position the plurality of first molds in a station where they are clamped perpendicular to the second mold. The control device, The rotary table is rotated to sequentially move the multiple first molds to the station where they are clamped together with the second mold. The injection molding machine according to claim 1, wherein when the first mold, which is being moved toward the station, approaches the station and the rotational speed of the rotary table begins to decrease, the injection device starts to move forward.

5. A control method for an injection molding machine having a clamping device for clamping a first mold and a second mold, and an injection device having a cylinder equipped with a nozzle that moves toward and away from at least one of the first mold and the second mold, In the molding process, The injection device is advanced toward a target position where the nozzle contacts the mold. When the injection device moves forward to a determination position that is in front of the target position, (i) When the first mold and the second mold are closed, the injection device is further advanced to the target position. (ii) A control method for an injection molding machine, characterized in that when the first mold and the second mold are not closed, the forward movement of the injection device is stopped, and after the first mold and the second mold are closed, the injection device is further advanced to the target position.

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