JP2009279867A - Injection molding equipment for composite molded product composed of different color or different material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide injection molding equipment wherein an insert component is primarily molded, and then a part of a primary molded product is additionally subjected to press working and finally the press-worked product is additionally subjected to secondary working to obtain a composite molded product, as the injection molding equipment wherein one injection molding machine carries out injection molding of a composite molded product composed of a molding material of two colors or two materials. <P>SOLUTION: This invention relates to the injection molding equipment for the composite molded product composed of the molding material of two colors or two materials, wherein the injection molding machine for performing the primary molding in a first metallic mold and then the secondary molding in a second metallic mold, includes an insertion device for charging the insert component into the first metallic mold, a pressing device which is provided at a middle position between the first metallic mold and the second metallic mold and which performs press working of a part of the first molded product and a transferring device which transfers the first molded product to the pressing device, transfers a press-worked product into the second metallic mold and then takes out a second molded product out of the machine. Thus the first molded product subjected to insertion molding is press-worked before the secondary molding to obtain the composite molded product. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, molding materials of different colors or different materials are injected and filled in a primary molding die and a secondary molding die, respectively, and a molded product molded by the primary molding die is subjected to secondary molding. The present invention relates to an improvement of an injection molding apparatus that manufactures composite molded articles made of molding materials of different colors or different materials by repeating transfer to a mold with one injection molding apparatus.

  Composite molded articles made of molding materials of different colors (hereinafter referred to as different materials) or different materials (hereinafter referred to as different materials) are used in many fields. For example, a composite molded product made of molding materials of different colors is familiar as a two-color molded product in which the ground and characters are molded with two-color materials, such as a key top of a personal computer. In addition, composite molded products made of different materials are put to practical use in various fields, for example, as composite molded products in which a soft material is additionally molded on a part of the surface of a hard material.

  Such a molded article is usually molded by one injection molding machine recently. The injection molding machine is called a different color molding machine or a different material molding machine, and two injection devices (primary molding injection device and secondary molding injection) that inject and fill molding materials of different colors or different materials. Apparatus), a primary mold corresponding to these injection apparatuses, and a single mold clamping device equipped with a secondary mold are provided on a single machine base. A primary molding cavity for primary molding is formed in the primary molding die, and a secondary molding cavity for secondary molding is formed in the secondary molding die.

  Such a two-color or two-material injection molding machine generally employs a rotary system that includes a rotating device that rotates the movable side of the mold, or a sliding system that also includes a sliding device that slides only the movable side. ing. In these systems, the primary molded product that has been primary molded is moved to the secondary molding side while being stuck to the primary molding cavity on the movable side. Therefore, these methods are widely used because it is not necessary to transfer the molded product from the primary molding cavity to the secondary molding cavity independently, although a slide device and a rotary device are required for the mold clamping device. It has been adopted.

  Further, there is a core back molding method as a method similar to the above method. That is, a part of the core in the movable mold can be moved back and forth, and a secondary molded product is formed in the cavity space formed by the retracted core. The method is similar in that the molding cavity on the fixed side is shared between the primary molding side and the secondary molding side.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-136921) proposes a method for manufacturing a thick resin container and a mold. The manufacturing method is a method in which a thick container is formed by one injection molding machine equipped with one mold clamping device and two injection devices. It is a method of repeating transfer between these cavities. That is, in the manufacturing method, a plurality of container-shaped cavities thickened in stages are arranged in parallel in a set of molds, and a molded product is formed in each cavity and each cavity is formed. This is a method of manufacturing a thick resin container by sequentially depositing the molded product on one side of the molded product by sequentially moving the molded product to the thick-side cavity. According to this method, it is described that the movable space of the mold can be reduced, the productivity can be improved, and the occurrence of warping of the molded product can be further suppressed.

  In the molding method described above, either the movable side cavity or the fixed side cavity is common to the primary molding and the secondary molding. Therefore, additional molding cannot be performed on the molding surface formed by the common cavity surface. Since the method according to Patent Document 1 is also overlay molding, it does not disclose anything other than addition of molding to the overlay surface.

  On the other hand, Patent Document 2 (Japanese Patent Application Laid-Open No. 2002-192553) proposes a method for producing a double-molded product. In this manufacturing method, a double injection molding machine equipped with one mold clamping device and two injection devices is provided with a product takeout device for transferring a primary molded product, and the product takeout device performs primary molding. In this method, the product is directly transferred from the primary molding core to the secondary molding core to form a double molded product. According to the manufacturing method, since the shape of the secondary molding cavity can be freely formed to some extent as long as the secondary molding cavity has a size containing the primary molded product, it is limited to the additional molding on one side as in the above example. Never happen. Therefore, it is described that, for example, a damper part or the like in which an elastomer is fixed around the front and back surfaces of the primary molded product can be molded. In this method, both the movable side cavity and the fixed side cavity can be made different between the primary molding and the secondary molding.

JP 2000-190365 A JP 2002-192553 A

  However, the applicant of the present application considers that there is still room for improvement in the conventional molding method for molding a composite molded article as an insert molded article. Here, the molding intended by the applicant of the present application is, for example, molding in which a plurality of thin strip-shaped plate materials are inserted. If such insert parts are divided into a plurality of parts when inserted into a mold, their handling, such as alignment, positioning, and fixing, becomes complicated.

  Such a composite molded product is, for example, a waterproof connector. It embeds a plurality of strip-shaped metal plate members that serve as connection terminal members in a partially exposed state on the housing of PBT or PA, and elastomer packing as waterproof packing on the front and back sides of the housing. It is a molded product that is fixed across. In such molding, it is convenient for the insert that the insert part is formed by joining a plurality of strips at appropriate places, but the joined part must be removed before the final product is obtained. The stripped portion can be removed only after the strip material is joined at another location by the molding material. Therefore, cutting of such insert parts must be performed between primary molding and secondary molding.

  In addition, there are many composite molded articles that are convenient to press into insert parts during molding. The insert part in this molding has a simple shape such as a flat plate until it is inserted, and is bent for the first time just before the secondary molding in the mold. If such molding is possible, handling of the insert member before insertion can be facilitated. In addition, considering that the primary molding cavity and the secondary molding cavity can be formed in a somewhat free shape as will be described later, this type of molding freedom can be improved in each stage.

  From the viewpoint of whether or not such molding is possible, if the above-described molding method or the manufacturing method of the patent document is examined, it must be said that there is still room for improvement in those molding methods. This is because these molding methods do not envisage insert parts, and therefore do not propose any processing technology. This is because, conventionally, this type of pressing is performed outside the molding machine, that is, outside the machine as an external setup.

  The present invention seeks to improve such a conventional method of forming a composite molded product, and even an insert molded product can be molded as a composite molded product, and in particular, a primary molded insert molding. The present invention proposes an injection molding apparatus in which a press work is added to a part of a product and a composite molded product can be formed by performing secondary molding on the workpiece.

  In order to solve the above-described problems, the present invention is different in one mold clamping device in which a primary molding die for primary molding and a secondary molding die for secondary molding are mounted, and these molding dies. Two injection devices for injecting molding materials of different colors or different materials, and forming a primary molded product with the molding material of one color or material with the primary molding die, The secondary molded product is transferred to the secondary molding die, and the secondary molded product is molded with the molding material of the other color or material onto the primary molded product with the secondary molding die. In an injection molding apparatus for a composite molded product that is a composite molded product made of molding materials of different colors or different materials, an insert device for inserting an insert part into the primary molding die, the primary molding die and the 2 A pressing device for pressing a part of the primary molded product at an intermediate position between the secondary molding dies; Then, during the mold opening operation, the primary molded product is transferred from the primary molding die to the press device, and the pressed workpiece is transferred from the press device to the secondary molding die. And a transfer device for substantially simultaneously performing an operation of mounting and an operation of taking out the secondary molded product from the secondary molding die to the outside of the machine. The primary molding is performed by adding primary molding to the insert part. A composite molded product obtained by forming a product, applying press processing to the primary molded product before the secondary molding to obtain the processed product, and adding the secondary molding to the processed product at substantially the same time. This is an injection molding apparatus.

  The composite molded product injection molding device is a press device in which the press device punches a part of the insert part, and after the insert part is punched, it is divided into a plurality of strip shapes. The device which is a member may be sufficient.

  According to the injection molding device of the present invention, the primary molding die for primary molding and the secondary molding die for secondary molding are provided with two injection devices for injecting molding materials of different colors or different materials, A primary molded product is molded from the molding material of one color or material with the primary molding die, the primary molded product is transferred to the secondary molding die, and the secondary molding die is used. An injection molding apparatus for a composite molded product, wherein the primary molded product is further molded with a molding material of another color or material to form a composite molded product made of a molding material of a different color or different material. An insert device that inserts an insert part into a secondary molding die, and a press device that presses a part of the primary molded product at an intermediate position between the primary molding die and the secondary molding die; During the mold opening operation, the primary molded product is removed from the primary molding die by the press. An operation of transferring the pressed workpiece to the secondary molding die, and taking out the secondary molding from the secondary molding die to the outside of the machine. And a transfer device that performs the operation substantially simultaneously, so that primary molding is performed on the insert part in a single injection molding machine, press processing is performed on a part of the primary molded product, and It is possible to form a composite molded article including an insert part by substantially simultaneously adding the secondary molding to the pressed workpiece. That is, since the primary molded product is transferred to the secondary molding cavity via the transfer device, the shape of the fixed side and the movable side of the secondary molding cavity are both the same as the shape of the primary molding cavity. It can be freely formed to some extent, and the combination of composite molded products of different colors and different materials can be varied including shapes. In addition, during the transition from primary molding to secondary molding, press work can be applied to molded products including insert parts, making it easy to handle insert parts up to the insert and post-insert processing. Eventually, the degree of freedom of molding of the composite molded product including the insert part is further expanded.

  In addition, the following forming is also possible, and the possibility of forming can be expanded. That is, in order to improve the fluidity of the resin at the time of molding, it is possible to perform molding in which primary bonding is performed to form a joint portion. In addition, it is possible to form a burr in order to improve moldability such as degassing in the primary molding. This is because the joint portion and burrs made of such a primary molded member must be removed especially when the secondary molding material is soft, but can be easily removed before the secondary molding by a press device. Moreover, even in the molding in which the primary molded product must be molded in a form connected to the runner, the runner can be removed before the secondary molding.

  Further, in the above molding apparatus, when the press device is a device for punching out the insert component, and the insert component is a member that is divided into a plurality of strip-shaped members after being punched out, Even if the insert part is to be supplied as a plurality of strips, it can be inserted as an insert member joined at an appropriate place, and after the primary molding and joined at another place, the original joined place It can be removed reliably.

  First, a composite molded article that is preferably molded by the injection molding apparatus of the present invention will be exemplified. The molded product is a composite molded product obtained by performing primary molding and secondary molding on insert parts with molding materials of different colors or different materials. It is exemplified as 10 in FIG. 1 (d) showing the molding process of the molded product, and after the primary molding shown in FIG. 1 (b), the punching process shown in FIG. (D) is obtained by adding secondary molding as shown in FIG. In addition, in each figure of (a) figure-(e), an upper figure is a top view, and a lower figure is AA arrow sectional drawing of an upper figure.

  Explaining in more detail the form in each forming process of the molded product 10, in FIG. 1 (a), the insert part 1 is still in the form in which two strip metal plate materials 1a are joined at the joining portion 1b. It is. And in (b) figure, primary molding is carried out so that the insert component may be partially wrapped with the primary molding member 2, and it becomes the primary molded product 5. At this time, the vicinity of the center of the primary molded product 5 is formed in a concave shape, and the coupling portion 1b is exposed to the space 2a. Next, in FIG. 4C, the primary molded product 5 is punched out from the portion 4 exposed in the space 2a to become the workpiece 6. Finally, in FIG. 4 (d), the workpiece 6 is partially secondary molded so as to be wrapped by the secondary molded member 3 to form the final molded product 10. At this time, the concave space 2 a and the punched portion 4 are filled with the secondary molding material 3. A small hole 1c for positioning, which will be described later, is formed in the coupling portion 1b.

  As described above, when the punched portion is a connecting portion 1b of a plurality of strip-shaped metal plate materials 1a (hereinafter referred to as strip-shaped portions), the goodness of the injection molding apparatus of the present invention is particularly brought out. . When the connecting portion 1b is removed before the insert or primary molding, the strip-shaped portion 1a is separated. The injection molding apparatus of the present invention fixes the strip-shaped portion 1a with the primary molding material 2. This is because the coupling portion 1b is removed.

  In addition, about the part punched, the various forms according to a molded article including the case where it press-processes are assumed. Although not shown in the drawings, for example, there is a type in which a joint portion is intentionally formed during primary molding and the joint portion is removed before the subsequent secondary formation. In this case, it is the case where it shape | molds in a combined state for the convenience of a metal mold | die and the fluidity | liquidity improvement of the resin at the time of shaping | molding. In addition, burrs may be generated in order to improve moldability such as degassing in the primary molding. Such molding is convenient when it is necessary to remove the bonded portion and burrs, particularly when the secondary molding material is soft. In such a case, the injection molding apparatus of the present invention removes them before the secondary molding by a press apparatus described later. Moreover, even if it is a case where a molded article must be shape | molded with the form connected with the runner and the gate, they can be similarly removed in the middle of shaping | molding.

  In other cases, it may be convenient to add press work to the insert part during molding. In that case, since the shape of the insert part at the time of inserting can be simplified, insert operation becomes easy. This is made possible by pressing the insert part before the secondary molding by the injection molding apparatus of the present invention. In addition, considering that a primary molding cavity (hereinafter referred to as a primary cavity) and a secondary molding cavity (hereinafter referred to as a secondary cavity), which will be described later, can be formed in a somewhat free shape. The degree of freedom in molding can be further expanded. Specifically, as shown in FIG. 1 (e), the insert part is inserted as a flat plate 11 that is not bent, and then pressed in a mold.

  Hereinafter, the outline of the injection molding apparatus 20 of the composite molded product of the present invention will be described with reference to FIG. The injection molding apparatus is basically the same as the configuration of a conventional different color molding machine or different material molding machine except that it is combined with an insert device 40, a press device 50, and a transfer device 60 which will be described later. In the following description, it is assumed that the molded products to be molded are the same as those described in FIG. 1, and are given the same numbers as those in FIG. The cross-sectional direction is a direction orthogonal to the lower AA arrow cross-section.

  As shown in FIG. 2, the injection molding apparatus 20 includes a primary molding die 31 (hereinafter referred to as a primary mold) for primary molding and a secondary molding die 32 (hereinafter referred to as secondary mold) for secondary molding. A mold clamping device 21 and two injection devices 22 and 23 for injecting molding materials of different colors or different materials into molding cavities of the molds. That is, the primary molding injection device 22 and the secondary molding injection device 23. And as long as there are two injection devices, the injection device is arranged in a V shape even if the two devices are arranged in parallel regardless of the orientation of the injection device toward the molds 31 and 32. Alternatively, one of them may be a parting injection device. The mold clamping device 21 can attach the primary mold 31 and the secondary mold 32 to a substantially symmetrical position with respect to the center along the opening / closing direction of the mold clamping device 21 and is molded by these molds. It suffices if the molded product can be protruded when the mold is opened. The state shown in the figure is a state in which the mold is closed. The ejector for projecting the molded product formed by each of the dies 31 and 32 will be displayed later as the ejectors 26 and 27 in FIG. 4B, and corresponds to the mounting position of each of the dies 31 and 32. Provided at substantially symmetrical positions.

  In general, an injection molding machine is often a horizontal type, but an insert molding machine is often a vertical type. Therefore, the injection molding apparatus 20 of the present invention is also practically used as a saddle shape in many cases. Normally, in the vertical molding machine, the lower platen 24 is a fixed platen, the upper platen 25 is a movable platen, and the injection devices 22 and 23 are arranged on the movable platen 25 side. This arrangement is different from a horizontal molding machine in which the injection device is arranged on the stationary platen side, which is the stationary side. However, since the injection molding apparatus of the present invention may be a horizontal type and it is not necessary to distinguish between the two, in the following description, the platen on the injection apparatus side will be referred to as a fixed side (upper side).

  The primary mold 31 and the secondary mold 32 are composed of movable (lower) movable (lower) molds 31a and 32a and fixed (upper) fixed (upper) molds 31b and 32b. A primary cavity 31c and a secondary cavity 32c are formed between them. Then, the primary molded product is molded by the primary cavity 31c, and the secondary molded product is molded by the secondary cavity 32c. Hereinafter, a location where primary molding is performed is referred to as a primary molding stage, and a location where secondary molding is performed is referred to as a secondary molding stage.

  More specifically, the molds 31 and 32 are configured as shown in FIG. First, the movable (lower) mold 31a of the primary mold 31 has a mounting seat surface 31d that contacts the insert part 1 so that the insert part 1 can be loaded. In order to position the insert component 1, for example, the mounting seat surface 31d is provided with guide pins 31e that are inserted into the plurality of small holes 1c (described above in FIG. 1) of the insert component 1. The space portion in which the insert part 1 is filled so as to be wrapped with the primary molding material 2 is a space of the primary molding cavity 31 c generated around the insert part 1.

  Next, the movable side (lower side) mold 32a of the secondary mold 32 has a mounting seat surface 32d on which the pressed workpiece 6 can be temporarily mounted. The surfaces of the secondary cavities 32c on both the fixed side (upper side) and the movable side (lower side) can be freely formed to some extent as long as they have a size including the primary cavity 31c.

  The meaning of “free to some extent” means that the secondary cavity 32c can be formed in a shape that is not constrained by the shape of the primary cavity 32c as long as the secondary cavity 32c is larger than the primary cavity 31c, and the cavity shape is secondary. This means as long as there is no hindrance to molding. In that sense, it is more practical that the secondary molded member 3 filled in the space 2a in FIG. 1D is formed as a recess as a whole so as not to fill the entire space. This is for avoiding thick molding of this portion.

  Therefore, in the present invention, the secondary molding material 3 to be additionally molded by the secondary molding is molded so as to make one turn over the front and back of the primary molded product (strictly, it is a workpiece). It is quite easy. In addition, since the temperature can be controlled independently including the temperature control of the mold, the combination of the two materials of the primary molding material 2 and the secondary molding material 3 can be a thermoplastic resin and a thermosetting resin, for example. Specifically, the primary molding material 2 may be molded with a thermoplastic resin that is a hard resin, and the secondary molding material 3 may be a soft thermosetting resin such as silicon rubber. Thus, in the present invention, the possibility of combining two materials can be further increased.

  The mold clamping device 21 of the injection molding apparatus 20 including the mold as described above includes an insert device 40, a press device 50, and a transfer device 60 described below.

  The insert device 40 is a conventionally known device that inserts the insert component 1 prepared outside the machine into the primary cavity 31c. The apparatus is schematically shown in FIG. 4B, and includes a gripping tool 42 that grips (or adsorbs) the insert component 1 at the tip of the arm 41. Then, the apparatus moves the tip of the arm during mold opening so that the gripping tool 42 is inserted into an insert supply stage (not shown) outside the machine where the insert part 1 is located, and a primary molding stage of the mold 31. Reciprocate between. The apparatus is mounted on the platen of the mold clamping apparatus 21 or is provided beside the molding machine 20.

  The press device 50 is a device that constitutes a press stage for press working. The apparatus is an apparatus that is attached to an intermediate position between the primary mold 31 and the secondary mold 32 in the fixed (upper) platen 25 and the movable (lower) platen 24 of the mold clamping device 21, and is installed in the mold. Except for being incorporated, the basic configuration is the same as that of a conventional press apparatus. That is, as shown in FIG. 3, the apparatus 50 includes a die stage on which a mounting seat surface 51a for placing the primary molded product 5 and a die 51b for receiving a punch for pressing a part of the primary molded product are formed. 51 is provided on the movable side (lower side) platen 24, and a pressing member (not shown) for pressing the primary molded product 5 onto the mounting seat surface at an appropriate location and a punch for pressing a part of the primary molded product The punch stage 52 formed with 52a is provided on the fixed side (upper side) platen 25 side. In addition, the die stage 51 includes an ejector 53 for pushing up the press-worked workpiece 6 from the mounting seat surface 51a as shown in FIG. The ejector 53 may have the same configuration as the ejectors 26 and 27 driven by, for example, a hydraulic cylinder (not shown).

  In such a press apparatus 50, either one of the two types of apparatuses described below with different timings for pressing the primary molded product 5 is employed. One apparatus is an apparatus that performs press processing in synchronization with a mold closing operation, and the other apparatus performs press processing independently of the mold closing operation.

  First, the former press device includes a punch as a fixing member, and in that sense, corresponds to the punch 52a in FIG. The length of the punch 52a is formed such that the punch 52a fits into the die 51b when the mold closing is completed. In press working, the length is the length to be pressed. Further, the press device 50 is configured such that the length of the pressing member (not shown) is such that the pressing member fixes the primary molded product first prior to the completion of mold closing. Therefore, the pressing member is provided as a member movable in the mold opening / closing direction on the punch stage 52, and is provided on the die stage 51 side by a compression coil spring (not shown) concentrically mounted on a moving shaft along the opening / closing direction. It is comprised so that it may stand by in the position pushed out toward. With such a configuration, the pressing member first fixes the primary molded product prior to the completion of the mold closing, and then the punch 52 is fitted or pressed into the die 51b when the mold closing operation is completed, thereby punching or pressing. Processing is synchronized with mold closing.

  On the other hand, the latter press device (not shown) is provided with a drive device for advancing and retracting the punch separately in the punch stage 52, and the length of the punch is pressed against or pressed against the length in which the punch fits into the die. Composed in length. For example, a hydraulic cylinder is employed as the driving device. In addition, the press apparatus includes a pressing member that holds the primary molded product as the fixing member is fixed to the punch stage 52 when the mold closing is completed. With such a configuration, the pressing member first fixes the primary molded product at the same time as the mold closing is completed, and then the punch is immediately inserted or pressed into the die to perform punching or pressing.

  As shown in FIGS. 4B to 5D, the transfer device 60 moves the primary molded product 5 from the primary cavity 31c to the press device 50 when the mold or the press device is opened. The operation of transferring, the operation of transferring the pressed workpiece 6 to the secondary cavity 32c, and the operation of taking out the composite molded product 10 which is the final molded product out of the secondary cavity are almost the same. It is a device that performs with timing. For this reason, the transfer device 60 includes three sets of gripping tools 61, 62, and 63 for gripping these molded products and workpieces, an arm device 64 provided at the tip thereof, and a drive for driving the arm device. An apparatus (not shown) is provided on the machine base (not shown), and the machine base is fixed, for example, on the platen of the mold clamping device 21 or in the vicinity of the mold clamping device 21. The three sets of gripping tools 61, 62, and 63 are arranged at equal intervals so that the molded product and the workpiece can be gripped and transferred between the stages when the arm device 64 moves.

  The mode of the transfer operation of the gripping tools 61, 62, and 63 is roughly as follows. First, these gripping tools move greatly between the outside of the machine and the mold together with the arm device 64. In addition, in order to transfer a molded product or the like between adjacent stages, these gripping tools perform an operation of moving forward and backward with respect to each cavity and an operation of moving to an adjacent stage.

  Next, the operation of transferring the molded product differs depending on whether or not a runner is generated during molding, but is roughly as follows. First, when the molded product is molded without a runner by the hot runner nozzle, since the runner is not generated, the molded product is directly gripped. This embodiment is the embodiment of FIG. 2 and is a hot runner nozzle in which 33 and 34 are schematically represented. In this case, as shown in FIGS. 4 (b) to 5 (d), the molded products 5, 10 and workpiece 6 pushed up by the ejectors 26, 53, 27 are held by the gripping tools 61, 62, 63 grips and retreats, and these gripping tools move to the next stage and load their molded articles or the like onto the next stage. Then, these gripping tools are retracted again while the molded product or the like is placed on the stage, and finally retract from between the molds and wait for the next transfer at an appropriate position.

  On the other hand, when a runner (not shown) is produced during molding, the runner may or may not be separated from the molded product during mold opening. The former case is typically a molding method in which a three-plate mold (not shown) is formed, and the first and second molds (the runner stripper plate and the fixed mold plate) are opened. In addition, the runner is separated from the molded product and naturally falls between them, or the runner is discharged out of the machine by a transfer device prepared separately. Accordingly, the movement of the molded product released between the second and third molds (fixed side mold plate and movable side mold plate) is directly gripped or adsorbed in the same manner as described above. On the other hand, in the latter case where the runner is not separated, the gripper grips the runner and transfers (not shown). In this case, the runner of the primary molded product is cut and spontaneously dropped when transferred to the next press device. At this time, the secondary molded product is also taken out of the machine, and a cutting device prepared separately. Finally, the runner is removed. Of course, only the secondary molding may be runnerless molding. In the present invention, the selection of the runner system is not limited because the primary mold and the secondary mold can be formed in a somewhat free shape as described above.

  With the injection molding apparatus 20 described above, the composite molded product is molded as follows. However, during the period from the start of the first molding step to the end of the cycle, molding progresses sequentially to primary molding, press processing, and secondary molding, and therefore, the state in which the simultaneous steps are sequentially increased passes. . That is, the step of performing the first molding by performing the insert first is performed independently, and then the primary molding and the press work are performed after the insertion and the transfer of the primary molded product to the press device are performed. Then, after the transfer of the insert and the primary molded product to the press device and the transfer of the workpiece to the secondary molding stage, primary molding, press working and secondary molding are performed. In the following description, the steps after such a step is completed and the steps after the steps are regularly repeated are repeated from the mold opening process to immediately before the next mold opening process. An example will be described.

  First, after cooling of the primary molded product 5 and the secondary molded product 10 after injection (when the secondary molding material is a thermosetting resin, including thermosetting by heating), (a) in FIG. ) Mold opening is performed as shown in the figure. When the mold opening is performed, as shown in FIG. 5B, the transfer device 60 places the gripping tools 61, 62, 63 between the primary mold 31, the secondary mold 32, and the press apparatus 50 substantially simultaneously. Let each gripping tool stand in front of each molding stage. On the other hand, the ejectors 26 and 27 of the mold clamping device 21 and the ejector 53 of the press device 50 remove the primary molded product 5 and the secondary molded product 10 from the primary cavity 31c and the secondary cavity 32c substantially simultaneously with the completion of the standby operation. The workpiece 6 is ejected from the die stage 51. And the transfer apparatus 60 advances each holding | grip tool 61,62,63, and hold | grips these molded products and a to-be-processed product. Then, the transfer device 60 retracts the gripping tool as it is, and takes out the molded product or the like from each stage. During this time, the insert device 40 grips the insert part 1 outside the machine to complete the preparation of the insert.

  Next, the arm 64 of the transfer device 60 moves as shown in FIG. 5C, and the respective gripping tools 61, 62, 63 are moved substantially simultaneously before the next molding stage to perform primary molding. The product 5 is moved to the press stage, the workpiece 6 is moved to the secondary molding stage, and the secondary molded product 10 is taken out of the machine. During this time, the insert device 40 moves the insert part 1 in front of the primary molding stage. Further, the ejector moves back to the original position.

  Next, each gripping tool 61, 62, 63 is advanced as shown in FIG. 4D, and the molded product 5 and the workpiece 6 are loaded on the next molding stage, and the secondary molded product which is a composite molded product. 10 is collected in a product collection box (not shown). During this time, the insert device 40 also loads the insert part 1 into the primary molding stage. Thereafter, each gripping tool retracts and finally moves out of the apparatus together with the arm device 64. The insert device 40 is also moved out of the machine in the same manner.

  Next, the mold is closed as shown in FIG. At this time, in the press device 50, the pressing of the primary molded product 5 is performed in synchronization with the mold closing operation or independently. When a part of the primary molded product 5 is punched by press working, the punched pieces are discharged at an appropriate timing (not shown). That is, when the punched piece is the connecting portion 1b of the insert part 1, the punched piece is discharged from the die 51b by appropriately providing a discharge port. When the punched piece is a runner, a space where the runner does not interfere is provided near the fitting portion between the punch 52a and the die 51a of the press device 50 so that the separated runner is discharged therefrom. Configure it to

  Next, injection is performed from the respective injection devices 22 and 23 to the respective cavities 31c and 32c. At this time, the injection operation is preferably performed as much as possible, but depending on the force relationship between the mold clamping force of the mold clamping device 21 and the mold opening force due to the filling pressure applied to the projected area of each cavity, or the cooling rate of the molding material The timing may be shifted in accordance with the difference (or heating rate). By doing so, the primary molding material 2 is filled in the primary cavity 31c so as to wrap the insert part 1, and the secondary molding material 3 is additionally filled around the workpiece 6 in the secondary cavity 32c. Then, each molded product is cooled (or heated), and the mold is opened again as shown in FIG.

  As mentioned above, the injection molding apparatus of the composite molded product of the present invention repeats the step of additionally molding the molding material of the other color or material to the primary molded product molded from the molding material of one color or material to the insert part. Thus, an insert-molded composite molded article made of molding materials of different colors or different materials can be molded.

It is a figure which shows the form in each shaping | molding process of the composite molded product containing the insert components shape | molded by this invention. Of these, (a) Figure shows the form before insertion of the insert part, (b) Figure shows the form formed by primary molding to the insert part, and (c) Figure punches the primary part. FIG. 4D shows a form formed by adding secondary molding to the work piece to form a secondary formed product. Moreover, (e) A figure shows the form in case the bending process of insert parts is not carried out. It is sectional drawing which shows schematically the structure of the injection molding apparatus of the composite molded product of this invention. It is sectional drawing which shows the outline of the press apparatus and metal mold | die contained in the injection molding apparatus of the composite molded product of this invention. It is sectional drawing which shows the shaping | molding process of the composite molded product of this invention, (a) A figure shows the state when a mold opening is performed, (b) A figure is taken out from each shaping | molding stage of each molded product or a to-be-processed product. It is a figure which shows the state immediately after being performed. FIG. 5 is a cross-sectional view illustrating the molding process of the composite molded product of the present invention, continuing from FIG. 4, and (c) the figure is moved to the next molding stage of each molded product and workpiece; FIG. It is a figure which shows the state loaded in the next shaping | molding stage of each molded article or to-be-processed goods, and the state where (e) figure was closed after that.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insert component 5 Primary molded product 6 Workpiece 10 Secondary molded product (composite molded product)
20 Injection molding device 21 for composite molded product 21 Clamping device 22 Injection device (injection device for primary molding)
23 Injection device (secondary molding injection device)
31 Primary molding die 32 Secondary molding die 40 Insert device 50 Press device 60 Transfer device

Claims (2)

  One mold clamping device on which a primary molding die for primary molding and a secondary molding die for secondary molding are mounted, and two groups for injecting molding materials of different colors or different materials into those molding dies The primary molding die is molded with a molding material of one color or material, the primary molding product is transferred to the secondary molding die, and The secondary molding is molded with the molding material of the other color or material on the primary molding with the secondary molding die, and the secondary molding is composed of molding materials of different colors or different materials. In an injection molding apparatus for a composite molded product as a molded product, an insert device for inserting an insert part into the primary molding die, and the intermediate portion between the primary molding die and the secondary molding die A press device for pressing a part of the next molded product, and the primary molding during the mold opening operation; Is transferred from the primary molding die to the pressing device, the pressed workpiece is transferred from the pressing device to the secondary molding die, and the secondary molded product is transferred to the secondary molding die. And a transfer device that performs the operation of taking out from the next molding die substantially simultaneously. The primary molding is added to the insert part to form the primary molding, and the primary molding is secondary. An injection molding apparatus for a composite molded product, wherein press processing is performed before molding to form the workpiece, and secondary molding is applied to the workpiece at substantially the same time.   2. The press device according to claim 1, wherein the press device is a press device that punches out a part of the insert part, and the insert part is a member that is divided into a plurality of strip shapes after the insert part is punched out. Injection molding equipment for composite molded products.

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