JP6344863B2 - Control method of injection molding machine - Google Patents

Description

The present invention relates to a method for controlling an injection molding machine in which a first mold for performing first molding and a second mold for performing second molding are arranged coaxially in the mold opening and closing direction and can be simultaneously clamped. Is.

Conventionally, two or more first molds for performing first molding and second molds for performing second molding are arranged in a direction perpendicular to the mold opening and closing direction, and at the same time or before and after the mold clamping by the mold clamping device. As an injection molding machine for injecting the first mold and the second mold, the one described in Patent Document 1 is known. However, in the case of Patent Document 1, since a mold clamping force is required for the sum of the projected area of the first mold cavity and the projected area of the second mold cavity, a large mold clamping device is required. There was a problem. In addition, since a plurality of molds can be attached to each base plate, there is a problem that the area of the fixed plate and the movable plate increases.

On the other hand, as an injection molding machine in which a first mold for performing first molding and a second mold for performing second molding are arranged coaxially in the mold opening and closing direction and can be simultaneously clamped, Patent Document 2 Etc. are known. In the case of Patent Document 2, the first mold and the second mold arranged on the same axis can be simultaneously clamped by the mold clamping device, so that the mold is half that of the injection molding machine of Patent Document 1. Molding is possible with tightening force.

JP-A-8-290438 (Claims 1, 0011, FIG. 1) JP 2007-50585 (Claims 1, 0028, 0029, FIG. 9)

However, in Patent Document 2, after injection into each mold from each injection device, the mold is opened almost simultaneously after cooling is completed in each mold, and a composite molded product is taken out. In this case, if the cooling time of the primary molding in one mold and the secondary molding in the other mold is substantially the same, no time loss occurs. However, if the other mold has a shorter cooling time than the other mold, the other mold having a shorter cooling time has a potential "wait". In particular, in one mold, a main part such as a window is formed by primary molding, and in the other mold, secondary molding is performed when an edge is formed around the main part. If the injection amount is significantly smaller than the next molding, the cooling of the main part in one mold is completed and the edge of the edge in the other mold is in a “waiting” state for a long time even after the cooling is completed. Become.

Therefore, in the present invention, a method for controlling an injection molding machine in which a first mold for performing first molding and a second mold for performing second molding are arranged coaxially in the mold opening and closing direction and can be simultaneously clamped. An object of the present invention is to provide an injection molding machine control method capable of shortening the molding cycle when the cooling times of the first mold and the second mold are different.

In the control method of an injection molding machine according to claim 1 of the present invention, the first mold for performing the first molding and the second mold for performing the second molding are arranged coaxially in the mold opening / closing direction. In the control method of the injection molding machine that can be simultaneously clamped, the first mold and the second mold are clamped at the same time, and the first mold and the second mold are simultaneously or before and after the mold clamping. During the cooling of the molded product with one of the first mold and the second mold, only the other mold that has been cooled quickly is opened first and a predetermined mold is opened. The working step is performed, and after that, when cooling of one of the molds is completed, the mold is released.

According to a second aspect of the present invention, there is provided a method for controlling an injection molding machine according to the first aspect, wherein the first molding is performed with the first mold and the second molding is performed with the second mold to form a composite molded product. During cooling, during the cooling of the primary molded product that has been primary molded with the first mold, only the second mold that has been quickly cooled is first opened and the composite molded by the secondary molding. It is characterized by performing a product take-out process.

According to the control method of the injection molding machine of the present invention, the first mold for performing the first molding and the second mold for performing the second molding are arranged coaxially in the mold opening / closing direction and can be simultaneously clamped. In the control method of the injection molding machine, the first mold and the second mold are simultaneously clamped, and the first mold and the second mold are injected simultaneously or before and after the mold clamping , While the molded product is being cooled with one of the first mold and the second mold, only the other mold that has been quickly cooled is first opened to perform a predetermined work process, and thereafter When the cooling of one of the molds is completed, the mold is released, so that the molding cycle can be shortened.

It is a schematic plan view at the time of mold opening of the injection molding machine of the embodiment of the present invention. It is explanatory drawing which shows the order of the control method of the injection molding machine of embodiment of this invention. It is process drawing which shows the control method of the injection molding machine of embodiment of this invention.

An injection molding machine 11 (hereinafter abbreviated as an injection molding machine 11) for a composite molded product according to an embodiment of the present invention will be described with reference to FIG. The injection molding machine 11 is a molding machine that molds a composite molded product using a plurality of resin materials, and includes a mold clamping device 12 and a first injection device 13 and a second injection device provided respectively on both sides thereof. The injection device 14 constitutes a basic part. The mold clamping device 12 of the injection molding machine 11 has a stationary platen 20 as a first plate to which a fixed die 19 of the first die A is attached and a movable die 15 of the second die B attached. Between the movable board 16 which is the second board, there is provided a rotary board 37 which is rotatable around a rotary shaft 36 in a direction perpendicular to the mold opening / closing direction and to which the intermediate molds 21 and 22 are attached on both surfaces. An intermediate member 18 is provided.

Clamping cylinders 23 (only one mold clamping cylinder 23 is shown in the schematic plan view of FIG. 1) are provided near the four corners of the fixed platen 20, and the ram of the mold clamping cylinder 23 also serves as a tie bar 24. . The mold clamping cylinder 23 is a bi-directionally operated cylinder, and a large area mold clamping oil chamber 25 is provided on the tie bar 24 side in the fixed platen 20 and on the non-tie bar side (first injection device side). A small-area mold opening oil chamber 26 is provided.

A half nut 28 is engaged with a portion (movable platen 16 side) far from the clamping cylinders 23 of the four tie bars 24 provided in parallel from the fixed platen 20 toward the movable platen 16 side. Locking portions 29 made of a plurality of concave grooves are provided over a predetermined length. A tie bar 24 is inserted into holes formed in the vicinity of the four corners of the movable platen 16 so that the movable plate 16 is moved in the mold opening / closing direction on a rail of a linear guide arranged on the base 17. The half nut 28 is disposed around a hole portion through which the tie bar 24 on the surface of the movable plate 16 on the side opposite to the fixed plate is inserted, and can be engaged and disengaged with respect to the engaging portion 29 of the tie bar 24. It has become.

Next, the intermediate member 18, the rotating disk 37, and the intermediate molds 21 and 22 will be described. Between the fixed plate 20 to which the fixed mold 19 is attached and the movable plate 16 to which the movable die 15 is attached, an intermediate member 18 is disposed so as to be movable in the mold opening / closing direction. Although not clearly shown in FIG. 1, the intermediate member 18 includes an upper frame inserted into the upper two tie bars and a lower frame inserted into the lower two tie bars and supported on the base 17. Yes. Between the upper frame and the lower frame, a rotating shaft 36 provided in a vertical direction (a direction orthogonal to the mold opening / closing direction) is rotatably held by a bearing, and a rotating plate 37 is fixed to the rotating shaft 36. . A servo motor 40 for rotating the rotating disk 37 is attached to one of the upper frame and the lower frame of the intermediate member 18. The turntable 37 which is a part of the intermediate member 18 is a substantially rectangular plate having a predetermined thickness, and the intermediate mold 21 and the intermediate mold 22 are attached to the mold mounting surfaces on both sides thereof. It has become.

Next, the first mold opening / closing mechanism 30 for opening / closing the movable plate 16 and the movable mold 15 will be described. A servo motor 31 is fixed to a support portion provided on the fixed plate 20 (or on the base 17). A ball screw 32 is pivotally supported by a support portion of the stationary platen 20 (or the base 17) so as to be rotatable by the servo motor 31. The ball screw 32 is connected to the drive shaft of the servo motor 31 directly or via a belt so that the drive force is transmitted. A ball screw nut 33 is fixed to a support portion provided on the movable platen 16, and the ball screw 32 is inserted into the ball screw nut 33. The servo motor 31 can detect the position and control the movement of the movable platen 16 using a built-in rotary encoder 31a. In the schematic plan view of FIG. 1, the first mold opening / closing mechanism 30 is omitted and only one unit is shown. However, the number is not limited and usually two or four units are provided. Further, the side on which the servo motor 31 and the ball screw nut 33 are attached may be reversed, and the servo motor 31 may be attached to the movable platen 16. Further, the first mold opening / closing mechanism 30 may use a hydraulic cylinder.

Next, the second mold opening / closing mechanism 42 that moves the intermediate member 18 (including the rotating disk 37) and the intermediate molds 21, 22 to open and close will be described. The second mold opening / closing mechanism 42 is provided between the movable platen 16 and the intermediate member 18. Support portions are fixed outwardly at positions near the four corners of the movable platen 16, a servo motor 43 is fixed to the support portion, a drive shaft of the servo motor 43 and a ball screw 44 are connected directly or via a belt, Driving force is transmitted. The servo motor 43 can control the position and movement of the intermediate member 18 using a built-in rotary encoder 43a.

Ball screw nuts 45 are fixed to the support portions provided on both sides of the intermediate member 18, and the ball screw 44 is inserted through the ball screw nut 45. The second mold opening / closing mechanism 42 can hold the position of the rotary disk 37 fixedly with respect to the movable board 16 by servo-locking the servo motor 43. The second mold opening / closing mechanism 42 also has a mold clamping function for the first mold A by driving the servo motor 43 to press the intermediate molds 21 and 22 toward the fixed mold 19. Yes. The mold opening / closing mechanism of the intermediate member 18 that is the second mold opening / closing mechanism 42 may be provided between the fixed platen 20 (or the base 27) and the intermediate member 18. In the schematic view of FIG. 1 and the like, the second mold opening / closing mechanism 42 is omitted and only one unit is described. However, the number is not limited, and at least two units, more preferably two units on both sides, a total of four units. Is disposed. Further, the side on which the servo motor 43 and the ball screw nut 45 are attached may be reversed, and the servo motor 43 may be attached to the intermediate member 18. Further, the second mold opening / closing mechanism 42 may use a hydraulic cylinder.

Next, the mold of the injection molding machine 11 will be described. The fixed mold 19 attached to the fixed plate 20 corresponds to one side of the first mold A that performs the first molding in the present embodiment. In the vicinity of the cavity surface of the fixed mold 19, a temperature control pipe 19a for cooling the molded product is provided. Further, a release cylinder 27 for release is provided around the cavity inside the fixed mold 19, and the rod is provided so as to protrude from the parting surface 19b. The number of release cylinders 27 is not limited, but it is desirable to provide a plurality (for example, 2 to 8). In the present embodiment, the movable mold 15 attached to the movable plate 16 corresponds to one side of the second mold B that performs the second molding. A temperature control pipe 15 a for cooling the molded product is provided in the vicinity of the cavity surface inside the movable mold 15.

The intermediate molds 21 and 22 have cavity surfaces having the same shape, and temperature control pipes 21a and 22a for cooling the molded product are provided in the vicinity of the internal cavity surface. The fixed mold 19 and the intermediate mold 21 (or the intermediate mold 22) are combined to form the first mold A, and the movable mold 15 and the intermediate mold 22 (or the intermediate mold 21) are formed as the mold. The second mold B is formed by combining them. Accordingly, the same intermediate molds 21 and 22 are not always matched in both the first mold A and the second mold B.

The first molding is performed by the first mold A which is a combination of the movable mold 15 and the intermediate molds 21 and 22, and the second mold is formed by the combination of the fixed mold 19 and the intermediate molds 21 and 22. You may make it perform 2nd shaping | molding by B. FIG. The release cylinder 27 is not essential and may be provided in any of the fixed mold 19, the intermediate molds 21 and 22, and the movable mold 15. Further, the fixed mold 19 and the intermediate molds 21 and 22 or the movable mold 15 and the intermediate molds 21 and 22 are fixed so that the mold is not opened unintentionally. Any of the molds 21 and 22 and the movable mold 15 may be provided with a lock cylinder for clamping. Further, as will be described later, when the mold is opened between one mold, the sub mold clamping devices for continuing the mold clamping between the other molds are fixed mold 19, intermediate molds 21, 22 and movable mold 19. Any of the above may be provided.

With the above configuration, the first mold A for performing the first molding and the second mold B for performing the second molding are arranged coaxially in the mold opening / closing direction, and the first mold opening / closing mechanism 30 is provided. The mold is closed by the second mold opening / closing mechanism 42 and can be clamped by the mold clamping cylinder 23 at the same time. Accordingly, the first mold A and the second mold B are clamped with substantially the same clamping force as a general injection molding machine having one fixed mold and one movable mold. be able to.

The temperature control pipe 15a of the movable mold 15, the temperature control pipe 19a of the fixed mold 19a, and the temperature control pipes 21a and 22b of the intermediate molds 21 and 22 are connected to a temperature control device (not shown), respectively, and the temperature is controlled from the temperature control device. A controlled medium (usually cooling water) is supplied.

Next, the injection device will be described. A first injection device 13 is provided on the base 17 on the side of the fixed platen 20. The first injection device 13 can move forward and backward with respect to the fixed platen 20. A second injection device 14 is provided on the side of the movable platen 16. The second injection device 14 is provided so as to be movable in its entirety, including the stand, along with the mold opening / closing movement of the movable platen 16, and only the second injection device 14 can move forward and backward with respect to the movable mold 15. Yes.

Next, the control method of the injection molding machine 11 for composite molded products will be described with reference to FIGS. 2 and 3, the movable plate 16 to which the movable die 15 is attached and the rotary plate 37 to which the intermediate dies 21 and 22 are attached are respectively opened (completed in mold opening) and molded last time. After the composite molded product P2 is taken out from the intermediate mold 22, it starts from a state after the rotating disk 37 and the intermediate molds 21 and 22 are rotated. Accordingly, the primary molded product that was previously molded with the first mold A between the fixed mold 19 and the intermediate mold 21 is opposed to the movable mold 15 while being attached to the intermediate mold 21. (See FIG. 2A).

The mold closing process starts from this state. In the mold closing process, the servo motor 31 of the first mold opening / closing mechanism 30 is driven to move the movable mold 15 and the movable platen 16 in the mold closing direction. Further, the servo motor 43 of the second mold opening / closing mechanism 42 is driven to move the intermediate molds 21 and 22 and the intermediate member 18 in the mold closing direction. Then, the fixed mold 19 and the intermediate mold 22 are combined, the intermediate mold 21 and the movable mold 15 are combined, and when the mold closing process is completed, the half nut 28 is engaged with the engaging portion 29 of the tie bar 24. The Then, hydraulic oil is supplied to the mold clamping oil chamber 25 of the mold clamping cylinder 23 to perform a mold clamping pressure increasing process (see FIG. 2B). Then, after confirming completion of mold clamping pressure increase, an injection filling process is performed. In the injection filling process, the molten resin is injected and filled into the cavity of the first mold A formed between the fixed mold 19 and the intermediate mold 22 from the first injection device 13 to perform primary molding (first molding). Molding). In the present embodiment, the primary molding is a main part such as a window part of a composite molded product as an example, and is a molded part that has a larger volume and a longer cooling time than the secondary molding. Primary molding may be performed by general injection molding, or may be performed by injection compression molding.

Further, in the injection filling process, the molten resin is injected and filled into the cavity of the second mold B formed between the movable mold 15 and the intermediate mold 21 from the second injection device 14 to perform secondary molding (second molding). ). In the present embodiment, the secondary molding is a frame portion formed around the main portion as an example, and is a molded portion that has a smaller volume and a shorter cooling time than the primary molding. In the present embodiment, the secondary molding is performed by general injection molding, but may be performed by injection compression molding. The timing of the injection of the primary molding and the injection of the secondary molding is performed at the same time or before and after so that one of the timings is accelerated. However, both are general injection moldings, and when the injection timing is shifted back and forth, it is preferable to perform the primary molding with a large volume first from the relationship between the cooling time and the cycle shortening.

As shown in FIG. 3, in both the primary molding and the secondary molding, a pressure holding process is performed after the injection filling process, and then a cooling process is performed. In the present embodiment, the primary molding (first molding) for molding the main part has a larger volume and requires a longer cooling time in the cooling process. On the other hand, the secondary molding (second molding) has a small volume and requires a short cooling time in the cooling process, so that the cooling is completed quickly. Clamping by the mold clamping cylinder 23 is continued while the primary molding and secondary molding cooling processes are performed in parallel. In this embodiment, when the cooling in the secondary process is completed, only the second mold B is opened first, and the composite molded product P2 is taken out. Specifically, hydraulic oil is supplied to the mold opening oil chamber 26 of the mold clamping cylinder 23 to perform strong mold opening (mold release process) between the intermediate mold 21 and the movable mold 15. At this time, the servo motors 43 of the four second mold opening / closing mechanisms 42 press the intermediate member 18 (including the rotary disk 37 and the intermediate molds 21 and 22) toward the fixed mold 19 side, and the first The mold A is kept in the clamped state. In this case, if the force for maintaining the first mold A in the mold clamping state is insufficient only with the force of the servo motor 43 of the second mold opening / closing mechanism 42, the fixed mold 19 and the intermediate mold 21 are used. 22 or the fixed platen 20 or the like may be provided with a mold clamping assist mechanism such as a sub mold clamping cylinder. The sub-clamping cylinder can also be used as the release cylinder 27 by devising the shape of a rod or the like.

When the strong mold opening (mold release process) by the mold clamping cylinder 23 is completed, in the next secondary mold opening process, the servo motor 31 of the first mold opening / closing mechanism 30 is driven to move the movable plate 16 and the movable mold 15. Is moved to the mold opening completion position. At this time, the servo motor 43 of the second mold opening / closing mechanism 42 is also driven, and position control or speed control is performed so that the mold clamping of the intermediate mold 22 and the fixed mold 19 is not released. When the second mold opening / closing mechanism is provided between the base 17 or the fixed platen 20 and the intermediate member 18, the operation of the second mold opening / closing mechanism at this time is not necessary. Then, in a state where the movable mold 15 and the intermediate mold 21 are opened, an extraction process which is a predetermined work process is performed. (In the present invention, “open the mold” does not necessarily require movement to the mold opening completion position, but the molds are in close contact with each other even though the mold opening operation is performed on the injection molding machine 11 side. (In the take-out process, the take-out machine 41 is inserted between the movable mold 15 and the intermediate mold 21 and an ejector mechanism (not shown) provided in the intermediate mold 21 is operated to operate the intermediate mold. 21, the composite molded product P2 is taken out (see (c) of FIG. 2). The composite molded product P <b> 2 may be released from the movable mold 15 so as to stick to the movable mold 15 and taken out from the movable mold 15. In any case, the extraction process is not limited to this time, but many times require about 3 to 8 seconds.

As shown in FIG. 3, the cooling process of the primary molded product is performed in the first mold A in parallel with the mold opening of the movable platen 16 and the removal of the composite molded product P2. In the present embodiment, when the cooling process of the first molding die A is completed after the composite molded product P2 is completely taken out from the other second die B, the release die 27 is used to remove the first mold A. Perform mold release. At the same time, the servo motor 31 of the first mold opening / closing mechanism 30 is servo-locked, and the servo motor 43 of the second mold opening / closing mechanism 42 is driven so that the intermediate member 18 and the intermediate mold 22 are fixed. You may perform the mold release from 19 (refer (d) of FIG. 3).

When the cooling time of the first mold A is extremely longer than that of the second mold B, the second mold B is opened and molded simultaneously with the end of the cooling process of the second mold B. Even if the product is taken out, the remaining time is left, and the cavity surface of the movable mold 19 and the cavity surface of the intermediate mold 21 are exposed to the atmosphere, and the mold temperature is lowered. Therefore, in such a case, the second mold B is opened in accordance with the end of the cooling process of the first mold A or the completion of the mold opening so that the time during which the mold opening of the second mold B is continued is as short as possible. It is desirable that the removal of the composite molded product P2 from the mold B is also completed. Further, when the first mold A is formed by the movable mold 15 and the intermediate molds 21 and 22 and the second mold B is formed from the fixed mold 19 and the intermediate molds 22 and 21, the second mold B is formed. Since it is not necessary to move the intermediate molds 21 and 22 when the mold B is opened, the removal of the molded product from the first mold A and the mold opening of the second mold B are performed simultaneously. Can be done in parallel. However, when the first mold A is formed by the fixed mold 19 and the intermediate molds 21 and 22 and the second mold is formed from the movable mold 15 and the intermediate molds 22 and 21, the movable mold 15 In many cases, it cannot be performed in parallel except when the composite molded product P2 is taken out of the product. Therefore, in this embodiment, as shown in FIGS. 3D and 3E, while the first mold A is being opened, the second mold B is in a standby state with the mold opened.

After the release by the release cylinder 27 is completed, the intermediate member 18 and the intermediate mold 22 are opened by the driving force of only the servo motor 43 of the second mold opening / closing mechanism 42. At this time, the servomotor 31 of the first mold opening / closing mechanism 30 is continuously servo-locked. When the mold opening process of the first mold A is completed (see (e) of FIG. 2), an inversion process is performed (see (a) of FIG. 2). In the reversing step, the rotary plate 37 and the intermediate molds 21 and 22 of the intermediate member 18 are rotated 180 ° again by the servo motor 40, and the movable mold is used for the primary molded product P1 of the intermediate mold 22 to perform the secondary molding. Inverted to a position facing 15. In the present invention, when there is a difference in cooling time between the first mold A and the second mold B, the cooling time is continued while the cooling process is continued in the first mold A having a long cooling time. The other second mold B having a shorter length is opened first, and the molded product is taken out, so that the first mold A and the first mold A simultaneously with the completion of cooling of the first mold A having a long cooling time. The molding cycle can be shortened by the time relating to the removal, compared to when the second mold B is opened at the same time or almost simultaneously.

Although the present invention is not enumerated one by one, it is not limited to the above-described embodiment, and it goes without saying that the present invention also applies to the following modifications made based on the gist of the present invention. That is.

In the control method of the present embodiment, the case where the primary molding performed by the first mold A has a larger cavity volume and the cooling time becomes longer than the secondary molding performed by the second mold B is described. did. However, regardless of the volume of the cavity, due to reasons such as differences in resin types, differences in mold temperature, differences in core operation performed during mold closing or clamping, foam molding and heating / cooling systems are adopted. It may be the case that the first mold requires a longer cooling time than the second mold, or the mold clamping needs to be continued even if there is no cooling relationship.

In the control method of the present embodiment described above, the movable platen 16 is stopped while the mold opening is completed, and the intermediate member 18 is moved after the composite molded product P2 is taken out. However, as another control method, when it is desired to use the mold release force (strong mold opening) by the mold clamping cylinder 23 for the mold release between the fixed mold 19 as the first mold A and the intermediate mold 21 or 22. The movable platen 16 is moved again by the first mold opening / closing mechanism 30 to close the intermediate mold 22 or 21 and the movable mold 15, and the half nut 28 is locked to the tie bar 24. 23, the first mold A may be released. However, in that case, when releasing the first mold A, it is necessary to devise so that the second mold B side does not open first.

Further, as a control method different from the present embodiment, the molding may be performed without rotating the intermediate member 18 and the intermediate molds 21 and 22 in the injection molding machine 11 for the composite molded product shown in FIG. . In this case, the first mold A and the second mold B are matched with each other in the same combination, and different first molding and second molding are performed. For example, the first molded product formed in the cavity between the fixed mold 19 that is the first mold A and the intermediate mold 22 is the movable mold 15 that is the second mold B and the intermediate mold. When the cooling time is longer than the molded product molded in the cavity between the mold 21 and the second mold B requires a longer time for a predetermined work process when the mold is opened than the first mold A In addition, the molding cycle can be shortened compared with the case where the mold clamping is completed and the mold is opened at the same time. As for the injection molding machine, even if the intermediate member does not have the function of rotating the intermediate mold, the first mold for performing the first molding and the second mold for performing the second molding are the molds. What is necessary is just to be arrange | positioned on the same axis | shaft of an opening-and-closing direction, and mold-clamping simultaneously. The molding method in that case is the same as the molding method performed without rotating the rotary disk 37 of the injection molding machine 11 described above.

In the above embodiment of the present invention, when the primary molding of the composite molded product has a longer cooling time and the secondary molding has a shorter cooling time, the composite molded product removal process (predetermined work process) is performed in parallel. It was described that the molding cycle is shortened by performing the above. However, in the present invention, the predetermined work process performed by opening the second mold B while the molded product is being cooled by the first mold A is the following work process in addition to the extraction process. Also good. Insert process for attaching an insert to an intermediate mold, process for correcting a composite molded product (removal of sprues and surplus parts, etc.), process for checking the quality of a molded product, and application process for an applied product to a composite molded product and a mold. Other processes where mold opening is desirable for molded products.

In most cases, the primary molding is used when the cooling time is longer, but the secondary molding is not excluded when the cooling time is shorter than the primary molding. For example, even if the cooling time is shorter in primary molding, it is desired to perform a predetermined work process (correction process, coating process, insert process, etc.) that requires a relatively long time by opening the primary molded product that has been primary molded. In this case, it is not impossible that the primary molding side is opened first.

Moreover, about the injection molding machine of the composite molded product of this invention, an intermediate member may not be penetrated by a tie bar. In that case, a rotating disk is rotatably attached to an intermediate member that can move on the bed in the mold opening and closing direction, and the intermediate molds are respectively attached to both surfaces of the rotating disk. The intermediate mold of the composite molded product injection molding machine of the present invention may be one in which a single member serving as both a mold and an intermediate member is placed on a rotating disk on a base. In this case, cavity surfaces are formed on both surfaces of a member that serves as a mold and an intermediate member. In addition, regardless of whether the rotating disk is held by the upper and lower frames or only by the lower disk, intermediate disks may be attached to the four surfaces of the rotating disk made of a rectangular parallelepiped. Therefore, the number of intermediate molds is at least two in order to match both the fixed mold and the movable mold, but may be four or six. Further, the number and arrangement relationship of the injection devices are not limited.

Further, the composite molded product injection molding machine according to the present invention may be such that a rotating plate rotatable around an axis is provided on a central fixed platen, and intermediate molds are attached to both surfaces of the rotating plate. In this case, movable plates that are opened and closed by a mold opening / closing mechanism with respect to the stationary platen are arranged on one side and the other side of the stationary platen, respectively. When the movable platen is closed by the mold opening / closing mechanism, the first mold A, which is composed of one of the movable mold and the intermediate mold and performs the primary molding, and another movable mold and another intermediate mold. A second mold B made of a mold is formed on the same axis in the mold opening / closing direction. The first mold A and the second mold B can be simultaneously clamped by a mold clamping device arranged on a movable plate or the like. In addition, a first injection device is provided outside the movable plate, and injection into the first mold A is possible. Further, a second injection device is provided outside the movable plate, and can be injected into the second mold B at the same time or before and after the mold clamping. The arrangement of the injection molding machine for the composite molded product is not limited to these.

DESCRIPTION OF SYMBOLS 11 Injection molding machine for composite molded products 12 Mold clamping device 15 Movable mold 16 Movable platen 18 Intermediate member 19 Fixed die 20 Fixed platen 21 and 22 Intermediate die 23 Clamping cylinder 30 First mold opening / closing mechanism
31, 40, 43 Servo motors 32, 44 Ball screw 33, 45 Ball screw nut 37 Turntable 42 Second mold opening / closing mechanism A First mold B Second mold

Claims (2)

In a control method of an injection molding machine in which a first mold for performing first molding and a second mold for performing second molding are arranged coaxially in the mold opening and closing direction and can be simultaneously clamped,
The first mold and the second mold are clamped at the same time, and the first mold and the second mold are injected simultaneously or before and after the mold clamping .
While the molded product is being cooled with either the first mold or the second mold, only the other mold that has been quickly cooled is first opened to perform a predetermined work process, Thereafter, when the cooling of one of the molds is completed, the mold is released from either one of the molds. When molding a composite molded product by performing primary molding with the first mold and secondary molding with the second mold,
During the cooling of the primary molded product that has been primarily molded by the first mold, only the second mold that has been quickly cooled is first opened, and the composite molded product that has been secondarily molded is taken out. The method for controlling an injection molding machine according to claim 1, wherein the control method is performed.