JP5574081B2 - Injection molding machine and injection molding method - Google Patents

Description

  The present invention relates to an injection molding machine and an injection molding method, and in particular, an injection suitable for high-mix low-volume production in which a molding material is exchanged with a different color or material and molding, or energy saving. The present invention relates to a molding machine and an injection molding method.

  Generally, an injection molding machine injects and fills a molding material such as a resin that is melt-plasticized by heating a mold clamping device to which a mold is attached and clamping with a predetermined force, and a cavity formed in the mold. The mold clamping device and the injection device are provided in a one-to-one correspondence (see, for example, Patent Document 1). When molding a molded product using such an injection molding machine, a mold is attached to a clamping device and clamped, and a cavity having a predetermined shape corresponding to the shape of the molded product is formed inside. Then, a molding material made of resin of a predetermined type (material) or color is injected and filled into a cavity formed inside the mold by an injection device.

  Further, in Patent Document 2, in an injection molding machine including a mold clamping unit having a fixed die plate and an injection unit, a pressure holding device including a hydraulic cylinder and a pressure holding cylinder is provided on a surface facing the injection unit. The molten resin passage of the pressure holding device is connected to an opening of a cavity provided in the fixed die plate, and the hydraulic cylinder and the pressure holding cylinder are connected to the molten resin passage. Is disposed at a substantially right angle, and a shutoff valve is disposed between the opening of the molten resin passage and the pressure-holding cylinder, and the nozzle of the injection unit is disposed at the opening of the pressure-holding device. After the contact, molten resin is injected from the nozzle, and more than one mold clamping unit equipped with the pressure holding device is arranged in parallel, and the injection unit is Injection molding machine is disclosed having a holding pressure device laterally movably arranged.

  Patent Document 2 states that “in an injection molding machine comprising a plurality of mold clamping units and one injection unit, injection molding can shorten the molding cycle time regardless of the plasticization time and cooling time of the resin. (The second column, right column, line 3 to column 7, line 7), “The nozzle of the injection unit comes into contact with the fixed die plate and the molten resin is injected. Thus, the cavity and the pressure holding device passage and the lower pressure holding cylinder are also filled, and the hydraulic cylinder and pressure holding cylinder of the pressure holding device act, the resin cools in the mold, and the resin shrinks in the cavity. Even when the pressure-carrying cylinder is pressurized, the molten resin is supplied for shrinkage, and thus a molded product free from bubbles, sink marks, etc. is formed.A shut-off valve is provided in the molten resin passage of the pressure-holding device. Arranged Therefore, in the case of a resin material having a low melt viscosity, a dripping phenomenon called “drawing” does not occur from the nozzle of the molding machine because the shut-off valve can prevent the back flow of the molten resin. Since the holding pressure can be applied even when the nozzle is not in contact, the injection unit can be retreated while plasticizing when the injection is completed, so that the molding cycle can be shortened. In the case where a plurality of mold clamping units are arranged and molding is performed with one injection unit, the injection unit simultaneously performs plasticizing action and lateral movement after injection completion. The cycle time can be shortened and continuous production is possible. ”(Gazette page 2, right column, line 34 to page 3, left column, line 13) To have.

  By the way, when molding molded products with different types and colors of resin, the resin that has been used up to that time is removed (purged), and the resin to be used next is supplied to the injection device. Then, the resin is exchanged to be melted, plasticized and prepared by heating and kneading (see, for example, Patent Document 3).

  In Patent Document 3, in a horizontal injection molding machine in which a mold clamping device and an injection device are installed in a substantially horizontal state on a machine body, a rotary table that rotates about a vertical axis is installed on the machine body. In addition, at least two of the injection devices are installed on the rotary table so that the injection direction of the rotary table is approximately 180 degrees opposite to the rotation axis of the rotary table, and the rotary table is rotated, and one injection device is provided. Is positioned at the injection position relative to the mold clamping device, the other injection device is positioned at the purge position, and when the other injection device is positioned at the injection position relative to the mold clamping device, one injection device is positioned at the purge position. A rotation mechanism that moves each injection device, and a positioning mechanism that stops each injection device at the injection position and the purge position, respectively. Horizontal injection molding machine is disclosed, wherein the obtaining.

  Patent Document 3 discloses, as a conventional technique, a process of “replacement of resin material in a heating cylinder in an injection device (there is also exchange of color even for the same material) when a large variety of resin molded products are forced to be produced. That is, the proportion of time spent for the work of purging the resin material in the heating cylinder and supplying a new resin material into the heating cylinder increases, which is inefficient. As a molding machine, two or more injection devices are provided so as to be slidable in a direction perpendicular to the machine longitudinal direction with the injection nozzle at the tip thereof facing the mold clamping device, and one injection device is provided. There is known a type in which a resin material is injected into a mold by being stopped at an injection position with respect to the mold, and the injection device.

  That is, in each case, in Patent Document 3 and the related art, a plurality of injection devices are provided for a single mold clamping device, and one injection device is located at an injection position with respect to the mold clamping device. At this time, the other injection device is configured to be positioned at the purge position. Therefore, one injection device cannot always be used for molding.

JP 2008-110557 A Japanese Patent Publication No. 3-74892 JP-A-6-55569

  However, among the above conventional techniques, in Patent Document 1, since the mold clamping device and the injection device are always operated correspondingly, in the case of a molded product having a long cooling time, the standby time on the injection device side is long. Accordingly, there is a problem in that it is difficult to improve energy efficiency because useless energy is required for the heating means for keeping the molding material in the heating cylinder of the injection apparatus warm.

  Further, among the above conventional techniques, in Patent Document 2, since a molding material is injected and filled into a plurality of mold clamping units by one injection unit, such a 1 is required when resin replacement is performed. Since the injection unit is purged and the next molding material is prepared, the molding machine is completely stopped. There was a problem that it was not suitable for.

  In addition, among the above conventional techniques, in Patent Document 3, when a plurality of injection devices are provided for a single mold clamping device and one of the injection devices is located at an injection position with respect to the mold clamping device, The other injection device is configured to be located at the purge position. Since the mold clamping device and the injection device located at the injection position have a one-to-one correspondence, the conventional general In the case of molding of a molded product that takes a long cooling time, there is a problem that molding efficiency including energy efficiency cannot be improved.

  Further, in Patent Document 3, since a plurality of injection devices are provided on the rotary table, each injection device cannot be moved independently. For example, even if molding by one injection device is completed, Until the purge of the other injection device is completed (when purging takes time, for example), or conversely, even if the purge of the other injection device is completed, until the molding by one injection device is completed (molded product) In the case where it takes time to cool and solidify, the rotary table cannot be driven to rotate, and it has been impossible to efficiently produce a large variety of resin molded products in a small quantity.

  The present invention has been made in view of the above-described problems, and is a case where it is possible to efficiently produce a large variety of resin molded products in a simple configuration, or to mold a molded product having a long molding cycle. However, it is an object of the present invention to provide an injection molding machine that can save energy and a method therefor.

In order to achieve the above object, an invention relating to an injection molding machine according to claim 1 includes a plurality of injection devices for injection-filling a molding material into a mold, a number of mold clamping devices equal to or greater than the number of injection devices, and injection. At least one of each injection device or each mold clamping device at a connection position where the device can be connected to the mold corresponding to the mold clamping device and a preparation position where the injection device does not correspond to the mold clamping device a moving means for moving, the connecting position at least one of the plurality of the injection apparatus or the respective clamping device, or, and a control means for controlling said moving means to move to said ready position, wherein A plurality of injection devices are arranged at the connection positions, respectively, and injection molding of the molding material into the corresponding mold, a part of the plurality of injection devices is arranged at the preparation position, and another injection The device is at the connection position Characterized in that to be able to perform is moved disposed between each connection position and the injection filling of the molding material into the corresponding mold.
In order to achieve the above object, the invention according to the second aspect of the present invention is the nozzle touch according to the first aspect of the present invention, wherein the injection device and the mold clamping device or the mold are combined at the connection position. It is characterized by comprising coupling means for applying force and nozzle closing means for preventing the molding material from leaking out from the nozzle of the injection device .
In order to achieve the above object, the invention according to the third aspect of the present invention includes a plurality of injection devices for injection-filling a molding material into a mold, and a number of mold clamping devices equal to or greater than the number of injection devices. Each injection device or each mold clamping device has a connection position where the injection device can be connected to the mold corresponding to the mold clamping device, and a preparation position where the injection device does not correspond to the mold clamping device. Moving means for moving at least one of them is provided in advance, and by the moving means, the plurality of injection devices are respectively arranged at the connection positions to inject and fill a molding material into a corresponding mold, or A part of the injection device is arranged at the preparation position, and another injection device is moved to the connection position to inject and fill the molding material into the mold corresponding to each connection position. .
In order to achieve the above object, the invention according to claim 4 is the invention according to claim 3 , wherein when a part of the plurality of injection devices is arranged at the preparation position, The molding material remaining in the injection apparatus is removed and the molding material is exchanged .
In order to achieve the above object, an invention according to claim 5 is the invention according to claim 3 , wherein either one of the plurality of injection devices and mold clamping devices is arranged and fixed , and the plurality of the plurality of injection devices are arranged. One of the injection device and the mold clamping device is linearly moved in parallel with either one of the arrangements .

According to the first aspect of the present invention, when a plurality of injection devices are respectively arranged at connection positions and injection filling of the molding material into the corresponding mold is performed, a plurality of normal moldings can be performed.
On the other hand, a part of the plurality of injection devices is arranged at the preparation position, and the other injection devices are moved and arranged at the connection positions to perform injection filling of the molding material into the mold corresponding to each connection position. in this case, while molded by injecting and filling each molding material of another injection apparatus into a mold of the mold clamping devices corresponding move disposed in each connection position, part disposed in the ready position of the injection apparatus can be performed, for example, the following order to Ru can make the necessary preparations for molding such as purging to a resin exchange, effectively diversified production of the resin molded article. Furthermore , when the number of injection devices used for molding is smaller than that of the mold clamping device, less energy is consumed to heat the molding material of the injection device.
Then, a plurality of injection devices are respectively arranged at the connection position, and a plurality of normal moldings are performed, and a part of the plurality of injection devices is arranged at the preparation position, and other injection devices are moved and arranged at the connection position. The molding to be performed can be selected as necessary, and either molding can be performed.
According to the invention of claim 2, in the invention of claim 1, there is provided coupling means for coupling the injection device and the mold clamping device or the mold at the connecting position to give a nozzle touch force. Thus, the corresponding injection device and the mold clamping device or the mold can be securely connected to each other at the connection position, and the molding material can be appropriately injected and filled into the cavity, and the molding material can leak from the nozzle of the injection device. By providing the nozzle closing means for preventing it from coming out, it is possible to prevent the molding material from leaking out of the nozzle even when the nozzle of the injection device is separated from the mold, and therefore the nozzle is leaked. The formed molding material does not contaminate the periphery of the injection molding machine, and the molding material can be accurately and reliably measured.
According to the invention of claim 3 , when a plurality of injection devices are arranged at the connection positions by the moving means and the molding material is injected and filled in the corresponding mold, a plurality of normal moldings are performed. be able to.
On the other hand, a part of the plurality of injection devices is arranged at the preparation position by the moving means, and another injection device is moved to the connection position and the molding material is injected and filled in the mold corresponding to each connection position. when the while molded by injecting and filling each molding material of another injection apparatus into a mold of the mold clamping devices corresponding move disposed in each connection position, they are arranged in the ready position one the injection apparatus parts can be carried out, for example, the following order to Ru can make the necessary preparations for molding such as purging to a resin exchange, effectively diversified production of the resin molded article. Furthermore , when the number of injection devices used for molding is smaller than that of the mold clamping device, less energy is consumed to heat the molding material of the injection device.
Then, a plurality of injection devices are respectively arranged at the connection position, and a plurality of normal moldings are performed, and a part of the plurality of injection devices is arranged at the preparation position, and other injection devices are moved and arranged at the connection position. The molding to be performed can be selected as necessary, and either molding can be performed.
According to the invention of claim 4, in the invention of claim 3 , while the molding material is injected and filled into the mold of each mold clamping device by another injection device, Therefore, it is possible to reliably remove the molding material remaining in the mold and replace the molding material. Therefore, it is possible to efficiently produce a large variety of resin molded products in small quantities.
According to the invention of claim 5, in the invention of claim 3 , one of the plurality of injection devices and mold clamping devices is arranged and fixed, and the other of the plurality of injection devices and mold clamping devices is fixed. By moving linearly in parallel with either one of the arrangements, it is ensured that at least one of the injection device or each mold clamping device is influenced by the situation of the predetermined connection position or preparation position by the moving means. It can be moved independently without

It is the top view shown roughly in order to demonstrate one Embodiment of the injection molding machine of this invention. It is the top view shown roughly in order to demonstrate another embodiment of the injection molding machine of this invention. It is explanatory drawing which showed an example of the time which 1 molding cycle requires. 2 is a timing chart shown in order to explain in detail a series of molding cycles by the injection molding machine shown in FIG. 1. It is explanatory drawing which showed time required in the case of shape | molding a molded product of 6 colors as one Embodiment of the action | operation of the injection molding machine shown in FIG. As a comparative example of the present invention, the time required for molding a molded product of six colors using two injection molding machines in which a conventional general injection device and mold clamping device are configured in a one-to-one relationship. It is explanatory drawing shown.

First, an embodiment of an injection molding machine according to the present invention will be described in detail with reference to FIG. In the drawings, the same reference numerals denote the same or corresponding parts.
The injection molding machine of the present invention generally includes a plurality of injection devices 11, 12,... For injection-filling a molding material into cavities formed in molds 30, 34, and the injection devices 11, 12,. The above-mentioned number of mold clamping devices 21, 22,... And injection devices 11, 12,... Correspond to the mold clamping devices 21, 22,. To the connection positions P3, P4... That can be connected to the injection devices 11, 12 to the preparation positions P1, P2 that do not correspond to the mold clamping devices 21, 22,. , 12... And at least one of the respective mold clamping devices 21, 22..., 12, and the mold clamping devices 21, 22. A predetermined one of at least one of the connection positions P3, P4... P1, control means for controlling the moving means to move independently of P2 (not shown, will be described later in detail content of the control) and a.
In the injection molding machine of the present invention, the nozzle 14 of the injection devices 11 and 12 and the mold clamping devices 21 and 22 or the introduction portion of the mold 30 (34) held by the nozzle 14 are detachably coupled. A coupling means for applying a nozzle touch force (illustration is omitted, the configuration will be described later), and a nozzle closing means for preventing the molding material from leaking from the nozzles 14 of the injection devices 11 and 12 (illustration is omitted). However, the configuration will be described later).

  Each of the injection devices 11 and 12 includes a heating cylinder 13 in which a screw is inserted and a molding material (resin in this embodiment) is plasticized, and a gold provided at the tip of the heating cylinder 13. A nozzle 14 that is in contact with the introduction portion of the mold 30 (34), and a shut-off valve that is provided on the nozzle 14 and prevents the molding material from leaking when the nozzle is not touching the mold. Nozzle closing means is provided, and is supported on the base 15 so as to be movable back and forth in the axial direction of the heating cylinder 13. In the case of the embodiment shown in FIG. 1, two injection devices 11 and 12 are provided.

  Each of the mold clamping devices 21 and 22 includes a stationary platen 31 to which the stationary mold 30 is attached, a pressure receiving plate 32 disposed in parallel to and opposite to the stationary platen 31, and the stationary platen 31 and the pressure receiving plate 32. A tie bar 33 provided therebetween, a movable plate 35 slidably inserted into the tie bar 33 and attached with a movable mold 34, and a movable plate 35 provided between the pressure receiving plate 32 and the movable plate 35 are fixed to the fixed plate. Drive means 36 for driving the movable mold 34 to move to the fixed mold 30 with a predetermined clamping force and to move the movable plate 35 away from the fixed plate 31 to open the mold with a predetermined clamping force. And. The drive means 36 can employ a hydraulic ram, a toggle mechanism, or the like. In the case of the embodiment shown in FIG. 1, two mold clamping devices 21 and 22 are arranged so that their mold opening and closing directions are parallel to each other. Further, the cavities in the molds 30 and 34 are injected and filled in the molds 30 and 34 even after the nozzles 14 of the injection devices 11 and 12 are detached from the introduction part such as the spool bush of the mold 30 (34). Pressure holding means is provided for holding the molding material and preventing shrinkage due to cooling and solidification. The introduction portion with which the nozzles 14 of the injection devices 11 and 12 are brought into contact is not limited to the spool bush provided in the fixed mold 30, but the abutting between the fixed mold 30 and the movable mold 34. Sometimes formed on the surface. Therefore, regarding the introduction part to be nozzle-touched, the code of the mold is described as 30 (34).

  For example, as referred to in Japanese Patent No. 3996591, the coupling means is adapted to be displaced so as to be engaged or non-engaged with an engaging portion such as a round bar provided on the fixed mold 30 or the fixed platen 31 and this engaging body. And a sprue bush of the mold 30 (34) with a predetermined force. The engaging means is provided at one end and the other end is provided at the injection devices 11 and 12. A thing provided with the traction means which gives a nozzle touch force so that it may contact a lead-in part etc. can be adopted.

  In this embodiment, the moving means includes a base 15 on which the two injection devices 11 and 12 are respectively supported, and the heating cylinder 13 has an axial direction parallel to each other and a direction substantially perpendicular to the axial direction. And a drive means (not shown) including a rail 40 that is supported so as to be linearly movable, and a servo motor that drives the base 15 that supports the injection devices 11 and 12 to move independently on the rail 40. Are omitted). The rail 40 is located in front of the introduction portion of the mold 30 (34) attached to each of the mold clamping devices 11 and 12 that are arranged so that the mold opening and closing directions are parallel to each other, such as a spool bush. And extends outward beyond a position corresponding to the arrangement of the mold clamping devices 21 and 22. As shown in FIG. 1, the injection devices 11 and 12 are moved at both ends extending beyond the positions corresponding to the arrangement of the mold clamping devices 21 and 22 of the rail 40, and any of the mold clamping devices 21 is moved. , 22 are configured as preparation positions P1 and P2, respectively. In this embodiment, the rail 40 is laid so as to support the two injection devices 11 and 12, but the present invention is not limited to this embodiment, and each injection device is 11 and 12 can also be laid so as to individually support them. Further, in the present embodiment, the moving means is described as being configured to move the injection devices 11 and 12 with respect to the fixed mold clamping devices 21 and 22, but the present invention is limited to this embodiment. The mold clamping devices 21 and 22 can be moved with respect to the fixed injection devices 11 and 12, and both the injection devices 11 and 12 and the mold clamping devices 21 and 22 can be configured. In either case, the injection devices 11 and 12 and the mold clamping devices 21 and 22 are relatively linearly connected to the connection positions P3 and P4 and the preparation positions P1 and P2, respectively. Anything that can be moved is included in the present invention.

  Further, the moving means includes a forward / backward moving mechanism for moving the injection devices 11, 12 mounted on the base 15 forward and backward relative to the mold clamping devices 21, 22. Although not shown, the forward / backward moving mechanism is configured by a ball screw mechanism or a hydraulic cylinder that is operated by a servo motor. The nozzles 14 of the injection devices 11 and 12 ahead of the predetermined distance from the path along which the injection devices 11 and 12 between the two preparation positions P1 and P2 move are the introduction portions of the molds 30 (34) of the mold clamping devices 21 and 22, respectively. The positions that can be contacted with each other constitute connection positions P3 and P4. The nozzle 14 may be pressed against the introduction portion of the fixed mold 30 at the connection positions P3 and P4 by driving the forward / backward movement mechanism, and a nozzle touch force may be applied.

  Purge receiving portions 51 and 52 for removing molding material remaining in the injection devices 11 and 12 are provided at the preparation positions P1 and P2. The purge receivers 51 and 52 are containers that are supplied into the heating cylinder 13 and receive the purge material discharged from the nozzles 14 of the heating cylinder 13 in a state including the remaining molding material and easily collect it. The injection devices 11 and 12 may automatically start purging by detecting that the injection devices 11 and 12 have been moved to the preparation positions P1 and P2.

  The control means receives position information of the connection positions P3, P4 and the preparation positions P1, P2 on the rail 40, and connects the injection devices 11, 12 to the connection positions P3, P4 or the preparation position P1 according to a program stored in advance. , P2 are each output to a driving means such as a servo motor of the base 15 supporting the injection devices 11 and 12 so as to be moved independently of each other.

  In the embodiment shown in FIG. 1, the description has been made based on the injection molding machine including the two injection devices 11 and 12 and the two mold clamping devices 21 and 22. As shown in FIG. 2, a plurality of injection devices and a number of mold clamping devices equal to or greater than the plurality of injection devices, such as two injection devices 11 and 12 and three mold clamping devices 21, 22 and 23. An injection molding machine is included. In addition, in embodiment shown in FIG. 2, the rail 40 is longer than what was shown in FIG. 1, and the joining position P5 is newly set by adding the mold clamping apparatus 23. FIG.

Next, as an embodiment of the injection molding method of the present invention, as shown in FIG. 1, an injection molding machine comprising two injection devices 11, 12 and two mold clamping devices 21, 22 is used. Then, in the case of molding the molded products of the same shape of A color to F color in a total of 6 colors by 60 each color, it will be described in detail based on FIGS. 3 to 5 together with the operation of the above-described injection molding machine. .
The injection molding method of the present invention generally includes a plurality of injection devices 11, 12... For injecting and filling molding materials into cavities in the molds 30 and 34, and a number of molds equal to or greater than the number of injection devices 11 and 12. The clamping devices 21, 22... And the injection devices 11, 12... Can be connected to the introduction part of the mold 30 (34) corresponding to the mold clamping devices 21, 22. The positions P3, P4,... And the injection devices 11, 12,..., And the preparation positions P1, P2, which do not correspond to the mold clamping devices 21, 22,. A moving means for independently moving at least one of 21 and 22 is provided in advance, and at least one of the plurality of injection devices 11, 12... Or mold clamping devices 21, 22. P3, P4... Or preparation positions P1, P It is to move on.
Further, the injection molding method of the present invention further fixes and arranges any one of the plurality of injection devices 11 and 12 and the mold clamping devices 21 and 22, and the plurality of injection devices 11, 12. .., 21 is moved linearly in parallel with any one of the arrangements, and the corresponding injection devices 11, 12,. The molds 30 and 34 clamped by the mold clamping devices 21 and 22 are injection-molded, and the molding material remaining in the injection device 12 or 11 is removed at the preparation positions P1 and P2 to replace the molding material. Or to wait,

  The configuration of the injection molding machine used in the present invention is as described above. Therefore, in this embodiment, the mold clamping devices 21 and 22 are arranged and fixed so that the mold opening and closing directions are parallel to each other. The injection devices 11 and 12 supported on the rail 40 linearly move independently in parallel with the arrangement direction of the mold clamping devices 21 and 22. Next, the forward / backward moving mechanism is driven to cause the tip of the nozzle 14 of the injection device 11, 12 to the introduction portion such as a sprue bush of the mold 30 (34) attached to the mold clamping devices 21, 22. The positions that can be brought into contact with each other are the connection positions P3 and P4, and the positions that are outside the mold clamping devices 11 and 12 at both ends of the rail 40 are the preparation positions P1 and P2. The injection device 11 can move independently to the preparation position P1 and the connection positions P3 and P4, and the injection device 12 can move independently to the connection positions P3 and P4 and the preparation position P2.

  In this embodiment, as shown in FIG. 3, the injection devices 11 and 12 are joined to the mold clamping devices 21 and 22, respectively, and a molding material of a predetermined color is injected and filled into the cavities in the molds 30 and 34 ( It takes about 13 seconds to take the holding pressure from the injection device side, and about 37 seconds to take the molding material to cool and solidify after the injection is completed. It is assumed that the time is about 10 seconds, and the time required for weighing for the next molding cycle in parallel with the cooling is about 20 seconds.

  In this embodiment, as shown in FIG. 4, one of the injection devices 11 and 12 is formed alternately and sequentially with respect to the mold clamping devices 21 and 22. Between the injection and the metering, the shutoff valve constituting the nozzle closing means is opened and closed, and before and after the injection, the nozzle 14 is advanced, the nozzle touch force is applied by the connecting means, and the connecting means is released. The nozzle 14 is moved backward, and the movement of the injection device 11 or 12 (reverse movement, parallel movement, and forward movement) is performed between the joining positions P3 and P4 between the backward movement and forward movement of the nozzle 14. . The completion of the injection for one of the mold clamping devices 21 and 22 may be completed (or the start of the injection for one mold clamping device 21 (or 22) may be the start of the injection for the other mold clamping device 22 (or 21)). ) Is one cycle time of the injection device 11 or 12.

  On the other hand, in the mold clamping devices 21 and 22, while the shutoff valve is closed and the nozzle 14 is retracted after the injection is completed, the cavities in the molds 30 and 34 are injected and filled by the pressure holding means. The pressure of the molding material is maintained and shrinkage due to cooling and solidification is prevented. Then, after injection for one of the mold clamping devices 21 and 22 (one of the joining positions P3 and P4), injection for the other of the mold clamping devices 21 and 22 (the other of the joining positions P3 and P4) is performed, and then the mold clamping is performed again. Before the injection (one of the joining positions P3 and P4) with respect to one of the devices 21 and 22, the molding material is solidified and the molded product is molded. The mold is opened, the molded product is taken out, and the mold is closed. The mold is clamped with a predetermined force. The time from the completion of injection to the start of mold opening is the cooling time of the molded product. Also, the time from the start of mold opening to the start of mold opening in the next cycle (or the time from the start of injection to the one mold clamping device 21 (or 22) to the start of the next injection of each of the mold clamping devices 21 and 22 may be used. ) Is one cycle time of the mold clamping device.

  As shown in FIG. 5, first, the injection device 11 is supplied with the A-color molding material, and the control means connects the injection device 11 to the clamping devices 21 and 22 and corresponding joining positions P3 and P4, respectively. The nozzles 14 are joined to the introduction portion of the mold 30 (34) by alternately moving and arranged, and the nozzle 14 of the injection device 11 and the mold clamping devices 21 and 22 or the molds 30 and 34 are coupled by a coupling means. Then, the molding material is injected and filled with the nozzle touch force applied, and 60 A-color molded products having the same shape are molded. And when moving between these joining positions P3 and P4, the nozzle 14 of the injection device 11 is closed by nozzle closing means such as a shut-off valve, and the molding material does not leak from the nozzle 14, Weighing can be started when the mold clamping devices 21 and 22 are separated from the introduction portions of the mold 30 (34). Further, the mold 30 (34) of the mold clamping devices 21 and 22 is provided with a pressure holding means, and after the nozzle 14 of the injection device 11 is detached from the introduction portion such as the spool bush of the mold 30 (34). In addition, the molding material injected and filled in the cavities in the molds 30 and 34 can be held to prevent shrinkage due to solidification.

  Here, as shown in FIG. 3 and FIG. 4, the time of the molding cycle per A-color molded product by the injection device 11 is, for example, the time from the start of injection to the completion of cooling including the metering time. Second (13 seconds + 37 seconds), 10 seconds for mold opening and closing and removal of the molded product, and a total of 1 minute is required. In this embodiment, the injection device 11 alternately injects and fills the molding material into the cavities in the molds 30 and 34 of the mold clamping devices 21 and 22 and alternately molds 30 pieces each. A molded product can be molded well. Therefore, as shown in FIG. 5, in the case of molding 60 pieces of one color, 30 minutes is sufficient. Therefore, even when the molding material is a material that requires a relatively long cooling time, it can be reliably and efficiently molded.

  Further, at this time, the control means simultaneously moves the injection device 12 to the preparation position P2 located at the end of the rail 40, and prepares injection of the molding material such as supply of B color and its melt plasticization, that is, Prepare for resin replacement. Here, the preparation time is set to 20 minutes so that the injection devices 11 and 12 are purged and the molding material of the color to be used next can be injected and heated. Accordingly, since the preparation time (20 minutes) is shorter than the time (30 minutes) required for molding 60 A-color molded products by the injection device 11, the resin can be replaced easily and reliably. In addition, by changing not only the color of the resin as the molding material but also the type, it is necessary to change the temperature setting of the injection devices 11 and 12, for example, to lower it, and it is necessary to wait until the temperature drops to the set temperature. Even so, the temperature can be reliably adjusted to the set temperature, and therefore the next molded product can be appropriately molded.

  When the molding of 60 A-color molded products is completed, the control means moves the injection device 11 to the preparation position P1 located at the end of the rail 40 and uses it to the purge receiving portion 51 until that time. The purge of the A-color molding material which has been started is automatically started, and the supply of the C color different from the A color and the injection preparation of the melt-plasticized molding material, that is, the preparation for resin replacement are performed. Here, the time for the resin replacement of the injection device 11 is set to 20 minutes as in the case of the injection device 12. In addition, since the purge material containing the A-colored molding material until then purged is received by the container of the purge receiving portion 51, it is not contaminated by scattering around.

  At the same time, the control means alternately turns the injection device 12 supplied with the B-color molding material from the preparation position P2 to the joining positions P3 and P4 corresponding to the mold clamping devices 21 and 22, respectively. 60 pieces of B-color molded products having the same shape are formed by moving and arranging. The molding cycle time for each B-colored molded product requires a total of 1 minute as in the case of the A-color, and 60 pieces are formed in order to form 30 pieces by the mold clamping devices 21 and 22 respectively. In some cases it takes 30 minutes.

  Thereafter, similarly, when the molding of the B-color molded product by the injection device 12 is completed in a state where the resin replacement from the A color to the C color of the injection device 11 is completed and waiting, the control means will inject the injection device 11. Is moved from the preparation position P1 to the joining positions P3, P4 alternately and sequentially, and 60 C-color molded products having the same shape are formed, and the injection device 12 is moved to the preparation position P2 in the meantime. The B-color molding material is purged to replace the resin with the D-color molding material.

  Subsequently, when the molding of the C-color molded product by the injection device 11 is completed while the resin replacement from the B color to the D color of the injection device 12 is completed and waiting, the control unit turns the injection device 12 on. It is moved from the preparation position P2 and is alternately moved and arranged at the joining positions P3 and P4 in order to form 60 D-color molded products having the same shape, while the injection device 11 is moved to the preparation position P1 and C The color molding material is purged to replace the resin with an E color molding material.

  Thereafter, when the molding of the D-color molded product by the injection device 12 is completed while the resin replacement from the C color to the E color of the injection device 11 is completed and waiting, the control means prepares the injection device 11. Move from the position P1 and sequentially move to the joining positions P3 and P4 to form 60 E-color molded products with the same shape, and in the meantime, move the injection device 12 to the preparation position P2 to obtain D color. The molding material is purged to replace the resin with an F-color molding material.

  Further, when the injection device 11 completes the molding of the E-color molded product while the resin replacement from the D color to the F color of the injection device 12 is completed and is waiting, the control unit prepares the injection device 12. Move from the position P2 and move alternately to the joining positions P3 and P4 in order to form 60 F-color molded products with the same shape, while moving the injection device 11 to the preparation position P1 to obtain E color. The molding material is discharged to finish the molding, and then the injection device 12 is moved to the preparation position P2 to discharge the F-color molding material and the molding is finished. The time required for discharging the E molding material from the injection device 11 and discharging the F molding material from the injection device 12 is, for example, 10 minutes.

  As described above, in the case where 60 molded products having the same shape of 6 colors of A to F are formed for each color, in the present invention, the time required for molding 60 molded products with one color is 30 minutes. In the meantime, since the resin is exchanged in 20 minutes, it takes only 190 minutes in total to include the time to discharge the molding material from the injection devices 11 and 12 at the end. The power consumption can be saved and energy saving can be achieved.

  Next, a conventional general technique for comparison with the present invention will be described with reference to FIG. In the conventional general technique shown in FIG. 3, there are simply two injection molding machines in which the injection device 11 ′ and the mold clamping device 21 ′, and the injection device 12 ′ and the mold clamping device 22 ′ correspond respectively. And using A, C and E colors (injection device 11 'and mold clamping device 21') and B, D and F colors (injection device 12 'and mold clamping device 22') individually. Is shown. In the case where the injection device 11 ′ and the mold clamping device 21 ′ and the injection device 12 ′ and the mold clamping device 22 ′ are used in combination, as in the above-described embodiment of the present invention, a single-color molded product is used. The time required for each molding cycle is, for example, 50 seconds for the cooling time including the metering time, 10 minutes for opening and closing the mold and taking out the molded product, and one minute for the resin replacement. 20 minutes.

  In the conventional general technique shown in FIG. 6, the injection device 11 ′ and the mold clamping device 21 ′ and the injection device 12 ′ and the mold clamping device 22 ′ are used alone (one-to-one relationship), respectively. For this reason, it takes 60 minutes to individually mold the 60 molded products of each color. Each injection device 11 ′, 12 ′ has a total time of 230 minutes in the injection device 11 ′ and the mold clamping device 21 ′ because the time required for resin replacement is added to the time 60 minutes required for individual molding of each color. It is. When the worker changes the resin by one person, it is inconvenient if the resin replacement time (timing) overlaps. Therefore, the injection device 2 ′ and the mold clamping device 12 ′ start molding by shifting 20 minutes, Therefore, it takes 250 minutes to form 60 molded products with 6 colors, that is, it takes an extra hour compared to the present invention, and the total power consumption is large. Become.

In the above-described embodiment, the case where an injection molding machine including two injection devices 11 and 12 and two mold clamping devices 21 and 22 as shown in FIG. 1 is used has been described.
As shown in FIG. 2, when using an injection molding machine comprising two injection devices 11, 12 and three mold clamping devices 21, 22, 23, either one of the injection devices 11, 12 is used. Are sequentially moved to the joining positions P3, P4, and P5 to correspond to the mold clamping devices 21, 22, and 23, and a molding material of a predetermined color or material is injected and filled to form a molded product. , 12 can be moved and arranged to the preparation position P1 or P2 to perform resin replacement. If the time required for resin replacement is shorter than the time required for molding by the number of mold clamping devices 21, 22, 23, the injection device 11 is sequentially moved and arranged at the joining positions P3, P4 after resin replacement. Molding is performed by the mold clamping devices 21 and 22, and the injection device 12 is alternately moved to the joining positions P4 and P5 and molded by the mold clamping devices 22 and 23, or any of the injection devices 11 and 12 after resin replacement. One of them is sequentially moved and arranged at the joining positions P3, P4, or P4, P5 and molded by the mold clamping devices 21, 22, or 22, 23, and the other of the injection devices 11, 12 is joined at the joining position. It can also be molded by the mold clamping device 22 or 25 while being moved to P3 or P5.

  Moreover, the injection molding machine of this invention can be used for the purpose of energy saving besides the efficiency improvement of production in the case of frequently performing resin replacement. In the case of the embodiment shown in FIG. 1, the molded product formed by the molds 30 and 34 of both the mold clamping devices 21 and 22 is longer than the time obtained by adding the weighing time for two times and the movement time of the injection device. When the molding cycle is long, one injection device 11 or 12 is completely stopped, and the other injection devices 12 or 11 are injected into the molds 30 and 34 of both mold clamping devices 21 and 22 for molding. I do. That is, since the injection devices 11 and 12 consume the most energy such as electric power for heating the heating cylinder 13, the energy consumption can be reduced by operating only one of the injection devices 11 and 12. . When molding a molded product having a short molding cycle, both the injection devices 11 and 12 are moved to the connection positions P3 and P4, and injection is performed to the corresponding mold clamping devices 21 and 22 to mold the molded product. (Normal molding).

  Furthermore, as to the types of the respective mold clamping devices of the present invention, as is known, for example, in Japanese Utility Model Publication No. 50-17963, a main mold clamping device having a single drive means and fixedly arranged. And a plurality of molds that can be opened and closed, and a sub mold clamping device that moves the molds in a direction orthogonal to the drive direction of the main mold clamping device. The injection device in this case performs injection at the position of the fixed main mold clamping device. When the injection is completed, the main mold clamping device is opened, the sub mold clamping device is moved in a direction orthogonal to the driving direction of the main mold clamping device, and the mold that has been injected is moved to the take-out position. A holding pressure and cooling are applied during the movement of the sub-clamping device to the mold that is moved to the take-out position after the injection is completed, and when the cooling is completed, the sub-clamping device is opened. In the meantime, another mold of the sub mold clamping device is clamped by the main mold clamping device and injection is performed.

  The present invention includes, as an injection molding machine, a plurality of injection devices for injection-filling a molding material into a mold and a plurality of mold clamping devices for clamping the attached mold. The number of clamping devices is the same as or larger than that of the injection device, and the molding material is exchanged in parallel with molding the molded product by moving the injection device and the mold clamping device relative to the joining position and the preparation position. Anything can be applied. The molded products molded by the molds attached to the respective mold clamping devices are not limited to the same molded product as long as the cooling time is close.

  11, 12: Injection device, 14: Nozzle, 21, 22, 23: Clamping device, 30: Fixed die, 34: Movable die, 40: Rail, 51, 52: Purge receiving part, P1, P2: Preparation Position, P3, P4, P5: Joining position

Claims (5)

A plurality of injection devices for injection filling the molding material into the mold; and
More mold clamping devices than the injection device;
At least each injection device or each mold clamping device has a connection position where the injection device can be connected to the mold corresponding to the mold clamping device and a preparation position where the injection device does not correspond to the mold clamping device. Moving means for moving one;
Control means for controlling the moving means to move at least one of the plurality of injection devices or each mold clamping device to the connection position or the preparation position ;
A plurality of injection devices are respectively arranged at the connection positions, and injection filling of a molding material into a corresponding mold;
A part of the plurality of injection devices is arranged at the preparation position, and another injection device is moved and arranged at the connection position, and the injection filling of the molding material into the mold corresponding to each connection position;
An injection molding machine characterized by being able to perform In the connection position, a coupling means for coupling the injection device and the mold clamping device or the mold to give a nozzle touch force ;
The injection molding machine according to claim 1, further comprising nozzle closing means for preventing the molding material from leaking from the nozzle of the injection device . A plurality of injection devices for injection filling the molding material into the mold; and
More mold clamping devices than the injection device;
At least each injection device or each mold clamping device has a connection position where the injection device can be connected to the mold corresponding to the mold clamping device and a preparation position where the injection device does not correspond to the mold clamping device. Moving means for moving one in advance,
By the moving means, the plurality of injection devices are respectively arranged at the connection positions, and a molding material is injected and filled in a corresponding mold, or a part of the plurality of injection devices is placed at the preparation position. An injection molding method comprising: arranging and injecting a molding material into a mold corresponding to each connection position by moving and arranging another injection device to the connection position . 4. The molding material according to claim 3, wherein when a part of the plurality of injection devices is arranged at the preparation position, the molding material remaining in the injection device is removed and the molding material is replaced. Injection molding method. One of the plurality of injection devices and mold clamping devices is arranged and fixed, and the other of the plurality of injection devices and mold clamping devices is linearly moved in parallel with one of the sequences. The injection molding method according to claim 3 .

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