Injection molding machine and control method thereof

Abstract

The invention provides an injection molding machine and a control method thereof, which can shorten a molding cycle and can more reliably inhibit nozzle touch before a mold is closed. During the molding operation, the injection device (20) is advanced toward a target position where the nozzle (21a) is in contact with the movable-side mold (4). When the injection device (20) advances to a determination position in front of the target position, (i) when the fixed-side mold (3) and the movable-side mold (4) are closed, the injection device (20) is further advanced to the target position, (ii) when the fixed-side mold (3) and the movable-side mold (4) are not closed, the advancing of the injection device (20) is stopped, and after the fixed-side mold (3) and the movable-side mold (4) are closed, the injection device (20) is further advanced to the target position. The injection device (20) is further advanced to the target position.

Description

Technical Field

[0001] This invention relates to an injection molding machine and its control method. Background Technology

[0002] Patent Document 1 discloses an example of a conventional injection molding machine. This machine advances the injection unit based on the mold closing time from the start of mold closure to the completion of mold closing, as well as the retraction time of the injection unit, so that the mold closing and nozzle contact are completed simultaneously. Therefore, the mold closing action and the injection unit's forward movement are performed concurrently, shortening the molding cycle.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2013-6332 Summary of the Invention

[0004] In the aforementioned injection molding machine, for example, due to expansion caused by heating of the mold and template, the nozzle may come into contact before the mold is closed, and the mold or injection unit may be damaged.

[0005] The present invention aims to provide an injection molding machine and a control method for the injection molding machine, thereby shortening the molding cycle and more reliably suppressing nozzle contact before mold closing.

[0006] To achieve the above objectives, an injection molding machine according to one embodiment of the present invention includes: a mold closing device for closing a first mold and a second mold; an injection device having a cylinder having a nozzle disposed thereon that contacts and separates from at least one of the first mold and the second mold; and a control device for controlling the mold closing device and the injection device.

[0007] The control device, during the molding process,

[0008] The injection device is moved toward the target position where the nozzle contacts the mold.

[0009] When the injection device advances to a predetermined position in front of the target position, it determines whether the first mold and the second mold are closed.

[0010] (i) When the first mold and the second mold are closed, the injection device is further advanced to the target position.

[0011] (ii) When the first mold and the second mold are not closed, stop the forward movement of the injection device, and after the first mold and the second mold are closed, allow the injection device to advance further to the target position.

[0012] To achieve the above objectives, another embodiment of the present invention relates to a control method for an injection molding machine having a mold clamping device and an injection device, wherein the mold clamping device is used for closing a first mold and a second mold; the injection device has a cylinder body on which a nozzle is provided that contacts and separates from at least one of the first mold and the second mold, during the molding operation,

[0013] The injection device is moved toward the target position where the nozzle contacts the mold.

[0014] When the injection device advances to the determined position in front of the target position...

[0015] (i) When the first mold and the second mold are closed, the injection device is further advanced to the target position.

[0016] (ii) When the first mold and the second mold are not closed, stop the forward movement of the injection device, and after the first mold and the second mold are closed, allow the injection device to advance further to the target position.

[0017] According to the present invention, during the advancement of the injection device towards a target position where the nozzle contacts at least one of the first and second molds, if the first and second molds are closed, the injection device advances to the target position; if they are not closed, the injection device waits until the first and second molds are closed before advancing to the target position. Thus, when the closing action of the first and second molds occurs simultaneously with the advancing action of the injection device, it is possible to prevent the nozzle from contacting the molds before the first and second molds are closed. Therefore, the molding cycle can be shortened, and nozzle contact before the first and second molds are closed can be more reliably prevented. Attached Figure Description

[0018] Figure 1 This is a front view of the molding system according to the first embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A plan view of the molding system.

[0020] Figure 3 yes Figure 1 The molding system's mold closing device and its surrounding cross-section (the fixed side mold and the movable side mold are in the open state).

[0021] Figure 4 yes Figure 1 The molding system's mold closing device and its surrounding cross-section (the fixed side mold and the movable side mold are in the closed state).

[0022] Figure 5 yes Figure 1 Functional block diagram of the molding system.

[0023] Figure 6 It is used for explanation Figure 1 A diagram illustrating the action of the molding system (Action Example 1).

[0024] Figure 7 It is used for explanation Figure 1 A diagram illustrating the action of the molding system (Action Example 2).

[0025] Figure 8 It is a diagram used to illustrate the operation of a conventional molding system.

[0026] Figure 9 This is a front view of the molding system according to the second embodiment of the present invention.

[0027] Figure 10 It is used for explanation Figure 9 A diagram illustrating the action of the molding system (Action Example 3).

[0028] Figure 11 It is a pattern Figure 9 A plan view showing the positional relationship between the fixed-side mold on the rotary table of the molding system and the nozzle of the injection device.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1, 2… Molding System

[0031] 3… Fixed side mold

[0032] 4…Modible side mold

[0033] C…mold cavity

[0034] 5…Automatic machines

[0035] 7, 7A… Injection Molding Machine

[0036] 10… Mold Closing Device

[0037] 11… Rotary Table

[0038] 12…Modible Template

[0039] 20, 20A… Injection device

[0040] 21…Cylinder Block

[0041] 21a… Nozzle

[0042] 22… Screw

[0043] 70…Control device Detailed Implementation

[0044] <First Implementation>

[0045] Hereinafter, the molding system according to the first embodiment of the present invention will be referred to... Figures 1-8 Please provide an explanation.

[0046] The molding system 1 of this embodiment is used to inject and fill resin into the mold cavity C formed by the fixed side mold 3 and the movable side mold 4 to produce a molded article, namely product 200.

[0047] like Figure 1 , Figure 2 As shown, the molding system 1 includes an automatic machine 5 and an injection molding machine 7.

[0048] The automatic machine 5 has a conveying arm for moving product 200. The automatic machine 5 is positioned near the injection molding machine 7.

[0049] The injection molding machine 7 opens and closes the fixed side mold 3 and the movable side mold 4 in the vertical direction, injecting resin from top to bottom (vertical mold closing, vertical injection). The injection molding machine 7 has a mold closing device 10, an injection device 20, an ejection device 30, and a control device 70.

[0050] like Figures 3-5 As shown, the mold clamping device 10 has a rotary table 11, a movable template 12, a tailstock 13, multiple tie rods 14, a rotary drive mechanism 15, and an elbow mechanism 17.

[0051] The rotary table 11 is disc-shaped and is horizontally and rotatably mounted on the machine base 9 supported by the frame 8. Two fixed-side molds 3 are mounted on the rotary table 11 at a 180-degree interval. The rotary table 11 is rotated by a rotary drive mechanism 15, alternately positioning the two fixed-side molds 3 at the first station S1. Figure 1 , Figure 2 (right side position) and the second workstation S2 ( Figure 1 , Figure 2 (The left side position). The machine platform 9 and the rotary table 11 are fixed templates.

[0052] The first station S1 is the injection position for closing the fixed-side mold 3 and the movable-side mold 4, thereby injecting and filling the plasticized resin into the mold cavity C. The second station S2 is the molded product removal position for removing the product 200 from the fixed-side mold 3.

[0053] The movable template 12 is positioned above the rotary table 11. The movable template 12 can move vertically. The vertical direction is the mold closing direction. The movable template 12 is provided with a through hole 12a.

[0054] A movable side mold 4 is mounted on the movable template 12. The movable side mold 4 is provided with a resin channel 4a (injection port, runner, gate) communicating with the mold cavity C. The movable side mold 4 is opposite to the fixed side mold 3 positioned at the first station S1 in the vertical direction. The fixed side mold 3 is the first mold, and the movable side mold 4 is the second mold.

[0055] The tailstock 13 is configured to move vertically to below the machine base 9. Multiple pull rods 14 extend vertically through the machine base 9, connecting the movable template 12 and the tailstock 13.

[0056] The toggle mechanism 17 is positioned between the machine base 9 and the tailstock 13. The toggle mechanism 17... Figure 3 Bending in the manner shown, to Figure 4 It elongates as shown.

[0057] When the elbow mechanism 17 bends, the gap between the rotary table 11 and the movable template 12 increases, the movable mold 4 moves away from the fixed mold 3, and the fixed mold 3 and the movable mold 4 are in the open state (mold opening state).

[0058] When the toggle mechanism 17 extends, the gap between the rotary table 11 and the movable template 12 decreases, and the movable mold 4 contacts the fixed mold 3. The fixed mold 3 and the movable mold 4 are in a closed state (mold closed state). Moreover, when the toggle mechanism 17 has fully extended, the fixed mold 3 and the movable mold 4 close with a specified closing force (mold closed state).

[0059] The injection device 20 is positioned above the movable template 12. The injection device 20 includes a cylinder 21, a screw 22, an injection device drive mechanism 23, and a screw drive mechanism 24.

[0060] The cylinder 21 is cylindrical and has a heater (not shown) disposed on its outer circumferential surface. The cylinder 21 heats the resin. A nozzle 21a is provided at the top (bottom) end of the cylinder 21. The nozzle 21a is inserted into the through hole 12a of the movable mold plate 12 and contacts the movable side mold 4 (nozzle contact), thereby connecting with the resin channel 4a of the movable side mold 4. The resin plasticized in the cylinder 21 flows into the mold cavity C through the nozzle 21a and the resin channel 4a.

[0061] The screw 22 is located inside the cylinder body 21. The screw 22 can rotate and move in the vertical direction.

[0062] The injection device drive mechanism 23 moves the injection device 20 relative to the movable mold plate 12 in the vertical direction. As the injection device 20 moves in the vertical direction, the nozzle 21a moves away from or into the movable mold 4. The screw drive mechanism 24 rotates the screw 22 within the cylinder 21 and moves it in the vertical direction. Moving the injection device 20 and the screw 22 toward the movable mold 4 (downward) is called "forward," and moving them away from the movable mold 4 (upward) is called "reverse."

[0063] The ejector device 30 moves an ejector pin (not shown) mounted on the fixed-side mold 3 in the vertical direction. When the ejector pin protrudes from the outer surface of the fixed-side mold 3, the product 200 separates from the fixed-side mold 3. Moving the ejector pin in the direction protruding from the outer surface of the fixed-side mold 3 (upward) is called "forward," and moving the ejector pin in the direction of being received into the fixed-side mold 3 (downward) is called "reverse." The automatic machine 5 moves the product 200, separated from the fixed-side mold 3, to a predetermined position.

[0064] The control device 70 controls the overall movement of the molding system 1. The control device 70 has a microcomputer and a storage unit. The control device 70 controls the automatic machine 5, the mold clamping device 10 (rotary drive mechanism 15, toggle mechanism 17), the injection device 20 (injection device drive mechanism 23, screw drive mechanism 24), and the ejection device 30.

[0065] <Action Example 1>

[0066] For an example of the molding action of product 200 in molding system 1 (Action Example 1), please refer to... Figure 6 Please provide an explanation.

[0067] The storage unit of the control device 70 stores the target position Pt and the judgment position Pd used during the injection device 20's forward movement (nozzle advance) in the molding operation. The target position Pt is the position where the nozzle 21a contacts the movable side mold 4. The judgment position Pd is located in front of (behind) the target position Pt. The setting of the judgment position Pd takes into account the deformation of the movable side mold 4 and the movable template 12 due to heating. For example, when the judgment position Pd is located 5mm behind the target position Pt, the judgment position Pd is set to "5mm". The operator can change the setting value of the judgment position Pd.

[0068] Action Example 1 includes the following actions (1) to (12). Actions (1) to (12) are performed within one molding cycle. Action (1) is a common action performed at the first station S1 and the second station S2. Actions (2) to (9) are actions performed at the first station S1. Actions (10) to (12) are actions performed at the second station S2.

[0069] (1) "Rotating table rotates"

[0070] When the control device 70 confirms that the toggle mechanism 17 is bent and the fixed-side mold 3 and movable-side mold 4 positioned at the first station S1 are in the open state, the rotary table 11 is rotated 180 degrees. As a result, one fixed-side mold 3 moves from the first station S1 to the second station S2, and the other fixed-side mold 3 moves from the second station S2 to the first station S1. The fixed-side mold 3 that has moved from the first station S1 to the second station S2 is loaded with product 200.

[0071] (2) "Closed mold"

[0072] When the fixed-side mold 3 is positioned at the first station S1, the control device 70 begins to extend the elbow mechanism 17. The time when the elbow mechanism 17 begins to extend is taken as the mold closing start time Tc.

[0073] (3) "Nose advance 1"

[0074] The control device 70 begins the forward movement of the injection device 20 at the mold closing start time Tc. When the injection device 20 reaches the judgment position Pd, the control device 70 determines whether the fixed side mold 3 and the movable side mold 4 are in a closed state. In this example, since the mold is not in a closed state when the judgment is made, the control device 70 stops the forward movement of the injection device 20 and monitors the state of the fixed side mold 3 and the movable side mold 4. It should be noted that if the mold is in a closed state when the above judgment is made, the control device 70 continues to perform action (4) without stopping the forward movement of the injection device 20, allowing the injection device 20 to move to the target position Pt. In addition to the closed state, the control device 70 can also determine whether the fixed side mold 3 and the movable side mold 4 are in a closed state. That is, the control device 70 can determine the closed state as the closed state of the fixed side mold 3 and the movable side mold 4.

[0075] (4) "Nose Advance 2"

[0076] When the fixed mold 3 and the movable mold 4 are in the closed state, the control device 70 restarts the forward movement of the injection device 20, thereby advancing the injection device 20 to the target position Pt. As a result, the nozzle 21a of the injection device 20 contacts the movable mold 4, thereby connecting with the resin channel 4a. Meanwhile, the fixed mold 3 and the movable mold 4 are in the closed state.

[0077] (5) "Injection"

[0078] The control device 70 advances the screw 22, injecting the resin plasticized in the cylinder 21 into the mold cavity C.

[0079] (6) "Pressure Holding"

[0080] The control device 70 controls the position of the screw 22 in the front-back direction by applying a specified pressure (holding pressure) to the resin filling the mold cavity C.

[0081] (7) "Plasticization"

[0082] When the resin in resin channel 4a (gate) solidifies, the control device 70 rotates the screw 22, thereby delivering the resin to the front part of the cylinder 21 while plasticizing it. As a result, the screw 22 retracts.

[0083] (8) "Nozzle retraction"

[0084] The control device 70 retracts the injection device 20 to a predetermined retracted position. As a result, the nozzle 21a moves away from the movable mold 4.

[0085] (9) "Mold Opening"

[0086] After the specified cooling time has elapsed since the "pressure holding" action (6) is completed, the control device 70 begins to bend the elbow mechanism 17. Thus, when the movable mold 4 moves away from the fixed mold 3 and the elbow mechanism 17 has finished bending, the fixed mold 3 and the movable mold 4 are in the open mold state, and the action performed in the first station S1 is completed.

[0087] (10) "Top out and pin forward"

[0088] When the fixed-side mold 3, which carries product 200, 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 fixed-side mold 3, thereby separating product 200 from the fixed-side mold 3.

[0089] (11) "Top out and back out"

[0090] The control device 70 retracts the ejector pin into the fixed side mold 3.

[0091] (12) "Product Removal"

[0092] The control device 70 moves the product 200, which is separated from the fixed-side mold 3, to a predetermined position via the automatic machine 5. When the product 200 has finished moving, the operation performed at the second station S2 is completed.

[0093] When the actions (2) to (9) in the first station S1 and the actions (10) to (12) in the second station S2 are completed, the control device 70 returns to the action (1) and repeats the above actions (1) to (12).

[0094] <Action Example 2>

[0095] For other examples of molding actions of product 200 in molding system 1 (action example 2), please refer to...Figure 7 Please provide an explanation.

[0096] In addition to storing the target position Pt and the judgment position Pd, the storage unit of the control device 70 also stores the forward start adjustment time Ts. The forward start adjustment time Ts is a time used to adjust the forward start time of the injection device 20, based on the mold closing start time Tc (time 0). For example, when the forward movement of the injection device 20 begins 5 seconds after the mold closing start time Tc, the forward start adjustment time Ts is set to "5 seconds". When the forward movement of the injection device 20 begins 2 seconds before the mold closing start time Tc, the forward start adjustment time Ts is set to "-2 seconds". The operator can change the setting value of the forward start adjustment time Ts.

[0097] Action Example 2 is identical to Action Example 1 except that it includes action (3') "nozzle advance" instead of the aforementioned actions (3) "nozzle advance 1" and (4) "nozzle advance 2". That is, Action Example 2 includes actions (1), (2), (3'), (5) to (12). For Action Example 2, only the actions that are different from those in Action Example 1 (action (3')) will be explained.

[0098] (3') "Nose advances"

[0099] The control device 70 starts the injection device 20 to advance at the time obtained from the mold closing start time Tc and the advance start adjustment time Ts. When the injection device 20 advances to the judgment position Pd, the control device 70 determines whether the fixed side mold 3 and the movable side mold 4 are in a closed state. In this operation example, since the mold is in a closed state when the judgment is made, the control device 70 advances the injection device 20 to the target position Pt without stopping the advance of the injection device 20. As a result, the nozzle 21a of the injection device 20 contacts the movable side mold 4, thereby connecting with the resin channel 4a of the movable side mold 4. In addition, the fixed side mold 3 and the movable side mold 4 are in a closed state. It should be noted that when the above judgment is not in a closed state, the control device 70 performs the above operations (3) and (4) in the same way as in embodiment 1. The control device 70 may also determine whether the fixed side mold 3 and the movable side mold 4 are in a closed state instead of determining the closed state.

[0100] <Examples of past actions>

[0101] Examples of previous molding operations for product 200 in molding system 1 (examples of previous operations) are as follows: Figure 8 As shown. The previous action example is the same as action example 1, except that it includes action (3#) "nozzle advance" instead of the above actions (3) "nozzle advance 1" and action (4) "nozzle advance 2".

[0102] In the conventional operation example, after action (2) "mold closing" is completed, action (3#) "nozzle advance" begins. In action (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 closed state. Therefore, in the conventional operation example, since the closing action of the fixed mold 3 and the movable mold 4 and the advancing action of the injection device 20 are performed sequentially, the molding operation time is longer compared with operation examples 1 and 2 where these actions are performed simultaneously.

[0103] As described above, the injection molding machine 7 of the molding system 1 includes: a mold clamping device 10 for clamping the fixed-side mold 3 and the movable-side mold 4; an injection device 20 having a cylinder 21 with a nozzle 21a that contacts and separates from the movable-side mold 4; and a control device 70 for controlling the mold clamping device 10 and the injection device 20. During the molding operation for molding the product 200, the control device 70 causes the injection device 20 to advance toward the target position Pt where the nozzle 21a contacts the movable-side mold 4. When the injection device 20 advances to a judgment position Pd in ​​front of the target position Pt, the control device 70 determines whether the fixed-side mold 3 and the movable-side mold 4 are closed (closed state). When the fixed-side mold 3 and the movable-side mold 4 are closed, the control device 70 causes the injection device 20 to advance further to the target position Pt. When the fixed mold 3 and the movable mold 4 are not closed, the control device 70 stops the injection device 20 from advancing. After the fixed mold 3 and the movable mold 4 are closed, the injection device 20 advances further to the target position Pt.

[0104] Therefore, when the closing action of the fixed-side mold 3 and the movable-side mold 4 is performed simultaneously with the forward action of the injection device 20, it is possible to prevent the nozzle 21a from contacting the fixed-side mold 3 before the fixed-side mold 3 and the movable-side mold 4 are closed. As a result, the molding cycle can be shortened, and nozzle contact before the fixed-side mold 3 and the movable-side mold 4 are closed can be more reliably prevented.

[0105] Furthermore, in Operation Example 2, the forward start adjustment time Ts is stored in the storage unit 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 fixed mold 3 and the movable mold 4 begin closing) and the forward start adjustment time Ts. Thus, by adjusting the judgment position Pd and the forward start adjustment time Ts, the relationship between the closing action of the fixed mold 3 and the movable mold 4 and the forward movement of the injection device 20 is optimized, thereby further shortening the molding cycle.

[0106] <Second Implementation>

[0107] Hereinafter, regarding the molding system according to the second embodiment of the present invention, reference will be made to... Figures 9-11 Please provide an explanation.

[0108] The molding system 2 described in this embodiment is the same as the molding system 1 described above, and is used to inject and fill resin into the mold cavity C formed by the fixed side mold 3 and the movable side mold 4 to produce a molded article, i.e., article 200. In the following description, the same symbols are used for the same structures as those in the molding system 1 (including substantially the same structures), and detailed descriptions are omitted.

[0109] like Figure 9 As shown, the molding system 1 has an automatic machine 5 and an injection molding machine 7A.

[0110] The injection molding machine 7A opens and closes the fixed side mold 3 and the movable side mold 4 in the vertical direction. Figure 9 In the process, resin is injected from right to left (vertical mold closing, transverse injection). The injection molding machine 7A has a mold closing device 10, an injection device 20A, an ejection device 30, and a control device 70.

[0111] The injection device 20A is positioned above the machine base 9. Figure 9 The cylinder can move laterally (horizontally). The injection device 20A has a cylinder 21, a screw 22, an injection device drive mechanism 23, and a screw drive mechanism 24.

[0112] The injection device drive mechanism 23 causes the injection device 20A to move laterally. As the injection device 20A moves laterally, the nozzle 21a moves away from or into contact with the fixed-side mold 3 and the movable-side mold 4. This moves the injection device 20A towards the fixed-side mold 3. Figure 9 , Figure 11 Moving to the left side is called "forward", moving away from the fixed side mold 3. Figure 9 , Figure 11 Moving to the right side is called "backward".

[0113] The injection molding machine 7A has the same structure (including substantially the same structure) as the injection molding machine 7 described above, except that it has a transverse injection device 20A instead of a longitudinal injection device 20.

[0114] <Action Example 3>

[0115] For an example of the molding action of product 200 in molding system 2 (Action Example 3), please refer to... Figure 10 , Figure 11 Please provide an explanation.

[0116] In addition to storing the target position Pt and the judgment position Pd, the storage unit of the control device 70 also stores the closest time Tn. In this embodiment, the target position Pt is the position where the nozzle 21a contacts the fixed-side mold 3 and the movable-side mold 4. The closest time Tn is the time when the fixed-side mold 3, which moves 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 time Tn is set, for example, based on the start time of the rotation of the rotary table 11 (time 0).

[0117] In this embodiment, when the corner of the fixed-side mold 3, which is rectangular in plan view, passes in front of the nozzle 21a, the distance L between the fixed-side mold 3 and the nozzle 21a is the shortest, and the fixed-side mold 3 is closest to the nozzle 21a of the injection device 20. Figure 11 This is a schematic diagram showing the positional relationship between the fixed-side molds 3 (3A, 3B) on the rotary table 11 of the molding system 2 and the nozzle 21a of the injection device 20. Figure 11 In the middle, the rotary table 11 rotates clockwise, the fixed side mold 3A moves toward the first station S1, and the fixed side mold 3B moves toward the second station S2. Figure 11 The state where the distance L between the fixed side mold 3A and the nozzle 21a is the shortest is shown.

[0118] Action Example 3 is the same as Action Example 1 except that it includes action (3”) “nozzle advance” instead of the above action (3) “nozzle advance”. That is, Action Example 3 includes actions (1), (2), (3”), (4) to (12). For Action Example 3, only the action (action (3”) that is different from Action Example 1 will be explained.

[0119] (3”) “Nose advance 1”

[0120] The control device 70 begins the forward movement of the injection device 20 at the closest possible time Tn. When the injection device 20 reaches the judgment position Pd, the control device 70 determines whether the fixed-side mold 3 and the movable-side mold 4 are in a closed state. In this example, since the judgment is not made when the mold is not closed, the control device 70 stops the forward movement of the injection device 20 and monitors the state of the fixed-side mold 3 and the movable-side mold 4. It should be noted that if the mold is closed when the above judgment is made, the control device 70 continues to perform action (4) without stopping the forward movement of the injection device 20, allowing the injection device 20 to move to the target position Pt. In addition to determining the closed state, the control device 70 can also determine whether the fixed-side mold 3 and the movable-side mold 4 are in a closed state.

[0121] Molding system 2 has the same effect as molding system 1.

[0122] In addition, in molding system 2, injection device 20 moves forward and backward in the horizontal direction. Mold clamping device 10 has a rotary table 11 on which multiple fixed-side molds 3 are mounted. Through intermittent rotation, the multiple fixed-side molds 3 are sequentially positioned at a first station S1 where they are clamped with the movable-side mold 4 in the vertical direction. Control device 70 rotates the rotary table 11, causing the multiple fixed-side molds 3 to move sequentially at the first station S1 where they are clamped with the movable-side mold 4. When a fixed-side mold 3 moving towards the first station S1 is closest to the nozzle 21a, control device 70 begins the forward movement of injection device 20. Thus, when a fixed-side mold 3 moving towards the first station S1 passes the position most likely to collide with the nozzle 21a, control device 70 begins the forward movement of injection device 20. Therefore, collisions between the moving fixed-side molds 3 and the nozzle 21a are suppressed, and the forward movement of injection device 20 can begin earlier.

[0123] It should be noted that in the molding system 2, the control device 70 can start the forward movement of the injection device 20 not only at the closest time Tn, but also when the fixed side mold 3 (3A) moving toward the first station S1 approaches the first station S1 and the rotation speed of the rotary table 11 begins to decrease.

[0124] Although molding systems 1 and 2 have a fixed-side mold 3 mounted on the rotary table 11, alternatively, for example, in addition to the rotary table 11, it is also possible to use other molds. Figure 1 A sliding table that slides in the left and right direction is provided in the middle. A fixed side mold 3 is arranged on the sliding table, thereby positioning the fixed side mold 3 to the first station S1 and the second station S2. Alternatively, a movable template 12 and a fixed template opposite to it in the vertical direction can be provided, and the fixed side mold 3 is arranged on the fixed template, so that the fixed side mold 3 and the movable side mold 4 are always opposite each other in the vertical direction.

[0125] Although molding systems 1 and 2 can open and close the fixed side mold 3 and the movable side mold 4 in the vertical direction, they can also open and close the fixed side mold 3 and the movable side mold 4 in the horizontal direction (horizontal mold closing).

[0126] The embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. Relative to the above embodiments, the scope of the present invention also includes appropriate additions, deletions, design changes, or suitable combinations of features of the embodiments by those skilled in the art, provided that they do not depart from the spirit of the invention.

Claims

1. An injection molding machine having a clamping device for clamping a first mold and a second mold, an injection device having a cylinder body on which a nozzle is provided to be brought into contact with and separated 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, characterized in that, in a molding operation, the control device advances the injection device toward a target position at which the nozzle is to be brought into contact with the mold, judges whether the first mold and the second mold are closed when the injection device advances to a judgment position ahead of the target position, (i) further advances the injection device to the target position when the first mold and the second mold are closed, and (ii) stops the advance of the injection device when the first mold and the second mold are not closed, and further advances the injection device to the target position after the first mold and the second mold are closed. the control device has a storage section that stores an advance start adjustment time, and starts the advance of the injection device in accordance with a time at which a closing operation of the first mold and the second mold is started and the advance start adjustment time. the injection device advances and retreats in a horizontal direction, the clamping device has a rotary table on which a plurality of the first molds are provided, and the plurality of the first molds are positioned in turn in a work position in which the first molds are to be clamped in a vertical direction with the second mold by intermittent rotation of the rotary table, the control device rotates the rotary table to move the plurality of the first molds in turn in the work position in which the first molds are to be clamped with the second mold, and starts the advance of the injection device when the first mold moving toward the work position is closest to the nozzle. the injection device advances and retreats in a horizontal direction, the clamping device has a rotary table on which a plurality of the first molds are provided, and the plurality of the first molds are positioned in turn in a work position in which the first molds are to be clamped in a vertical direction with the second mold by intermittent rotation of the rotary table, the control device rotates the rotary table to move the plurality of the first molds in turn in the work position in which the first molds are to be clamped with the second mold, and starts the advance of the injection device when the first mold moving toward the work position approaches the work position, so that a rotation speed of the rotary table starts to decrease.

5. A control method of an injection molding machine having a clamping device for clamping a first mold and a second mold, and an injection device having a cylinder body on which a nozzle is provided to be brought into contact with and separated from at least one of the first mold and the second mold, characterized in that, in a molding operation, the injection device is advanced toward a target position at which the nozzle is to be brought into contact with the mold, when the injection device advances to a judgment position ahead of the target position, (i) the injection device is further advanced to the target position when the first mold and the second mold are closed, and (ii) the advance of the injection device is stopped when the first mold and the second mold are not closed, and the injection device is further advanced to the target position after the first mold and the second mold are closed. ​ ​ ​ ​ ​ 2. The injection molding machine of claim 1, wherein, ​ ​ ​ 3. The injection molding machine of claim 1, wherein, ​ ​ ​ ​ 4. The injection molding machine of claim 1, wherein, ​ ​ ​ ​ ​ ​ ​ ​ ​ (ii) stopping the advancement of the injection device when the first mold and the second mold are not closed, and further advancing the injection device to the target position after the first mold and the second mold are closed. (ii) stopping the advancement of the injection device when the first mold and the second mold are not closed, and further advancing the injection device to the target position after the first mold and the second mold are closed. (ii) stopping the advancement of the injection device when the first mold and the second mold are not closed, and further advancing the injection device to the target

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