JP5590451B2 - Multilayer molding die and method for replacing multilayer molding die - Google Patents

Description

  The present invention relates to a multilayer mold having a first mold, a second mold, and an intermediate mold, and a method for replacing the multilayer mold.

  Various molding methods such as those characterized by molding equipment or molding dies as molding methods for multilayer molded products consisting of various combinations of different materials, same materials, different colors, and same colors in resin molded products It has been known. A multilayer molded product is molded using a set of molds including a first mold, a second mold, and an intermediate mold that is moved and rotated between the first mold and the second mold. The molding method is one of them.

  Patent Document 1 discloses a fixed mold (first mold or second mold), a movable mold (second mold or first mold), and a rotation that rotates between the fixed mold and the movable mold. An injection molding machine for molding a multi-material molded product (multilayer molded product) using a mold comprising a mold (rotating mold part), wherein the first injection device abuts against the fixed mold and injects a molten material; A second injection device for injecting the molten material in contact with the movable die, and a rotary support device (rotating metal) for supporting the rotary die from a fixed plate so as to be rotatable and movable in the moving direction of the movable die. A multi-material injection molding machine (multi-layer injection molding machine) comprising a mold support part) and a compression means (mold opening / closing device) for compressing the fixed mold and the movable mold via the rotating mold is disclosed. Yes.

  In Patent Document 2, a stationary mold (first mold or second mold) attached to a stationary platen and a plurality of tie bars are connected to the stationary platen and the stationary platen is connected to the stationary platen. A movable mold (second mold or first mold) attached to a movable plate that is opened and closed, and a reversing or rotating mold provided between the fixed mold and the movable mold. (Rotating mold part) and a rotating mold holding frame (rotating mold support part) that rotatably supports the rotating side mold, and rotates with the fixed side mold and the movable side mold. The side mold is disposed inside the plurality of tie bars, the rotating mold holding frame is configured in a cross beam shape by a frame member positioned outside the plurality of tie bars, and the fixed side mold And the movable side mold through a spacing member, and when the movable side mold is opened, When the distance holding member is moved to a substantially intermediate position between the fixed side mold and the movable side mold and closed, the fixed side mold, the rotary side mold, and the movable side mold are closed. The first and second rotary recess molds are formed on both parting surface sides of the rotary mold, and the rotary recess mold is formed on the parting surface side of the fixed mold. A multi-layer molding die is disclosed in which a core die that cooperates with a movable recess die that cooperates with the rotating recess die is formed on the parting surface side of the movable die.

  In Patent Document 3, a movable die plate (movable platen) to which a movable die (second die or first die) is attached and a fixed die (first die or second die) are attached. A reversing table (rotating means) installed between a fixed die plate (fixed plate) so as to be movable in the same direction as the movable die plate, and can be rotated 180 degrees on the reversing table and fixed to the movable mold on both sides. Rotating die plate (rotary disc) fitted with molds (third mold and fourth mold) that fit into the side mold to form a cavity, and movable die plate mold opening and closing that opens and closes the movable die plate Means (die opening / closing device), rotary die plate mold opening / closing means (intermediate mold moving means) for opening and closing the rotary die plate, and mold clamping for simultaneously clamping the above three sets of die plates after closing the mold Means (mold opening and closing device) and different resin materials are plasticized and injection filled In a two-material injection molding machine (multilayer molding injection molding machine) having two sets of injection units (injection devices), the mold clamping means is a hydraulic mold clamping means for clamping three sets of die plates simultaneously. . The movable die plate type opening / closing means is a movable die plate type opening / closing means driven by an electric motor, and the rotating die plate type opening / closing means is a rotating die plate type opening / closing means driven by an electric motor. Discloses an injection molding machine for two-material molding, which is rotational drive means driven by an electric motor mounted on a reversing table.

  In addition, the parentheses in the description relating to Patent Document 1 to Patent Document 3 described above are constituent members of the present invention that are considered to be equivalent or similar to the constituent members immediately before the parentheses so as to facilitate understanding of the present invention. There is no suggestion that the constituent member immediately before the parenthesis matches the constituent member within the parenthesis.

JP 2006-168223 A JP 2010-064278 A JP 2008-080670 A

  The multi-material injection molding machine of Patent Document 1 is described as having a simple configuration and easy to remodel based on a general-purpose injection molding machine. Since all the mechanisms for rotating the rotary mold around the vertical axis are attached to the fixed platen, these mechanisms become complicated, and it is difficult to say that additional modifications are easy based on a general-purpose injection molding machine. . Further, according to this configuration, the supporting member for supporting the rotating mold and driving it in the mold opening / closing direction is extended from the fixed platen to the rotating mold opening limit position above and below the compression means. There is a problem that it is difficult to attach and detach as a set of molds obtained by combining a fixed mold, a rotating mold, and a movable mold by using existing equipment such as an overhead crane from at least above the compression means. .

  Next, in the multilayer molding die disclosed in Patent Document 2, the rotating side die disposed between the fixed side die and the movable side die is rotatably supported by the rotating die holding frame. Along with the movement of the movable side mold in the mold opening / closing direction, the rotation side mold is rotated via a spacing member that is moved to a substantially intermediate position between the fixed side mold and the movable side mold. A mold holding frame is coupled to the fixed side mold and the movable side mold. Therefore, unlike Patent Document 1, there is no need to additionally modify a general-purpose injection molding machine with a mechanism for driving the rotating side mold in the mold opening / closing direction or a mechanism for rotating.

  However, it is presumed that the multilayer molding die disclosed in Patent Document 2 has a problem in die replacement. The multi-layer molding die of Patent Document 2 is a rotating die that rotatably supports a rotating side die with respect to a fixed side die, a rotating side die, and a movable side die arranged inside a tie bar. The mold holding frame body is formed in a cross beam shape by a frame member located outside the tie bar, and the rotating mold holding frame body is coupled to the fixed side mold and the movable side mold by a spacing holding member. That is, if estimated from this configuration, the fixed-side mold and the movable side arranged on the inner side of the tie bar are not removed unless the gap holding member coupled to the cross-shaped rotating mold holding frame arranged on the outer side of the tie bar is removed. It is difficult to attach and detach the mold from the mold opening / closing device. Next, the cross-girder-shaped rotating mold holding frame arranged outside the tie bar is difficult to detach from the mold opening / closing device unless it is divided, and the rotating mold holding frame must be divided. In this case, it is difficult to attach and detach the rotating side mold from the rotating mold holding frame. That is, in the multilayer molding die of Patent Document 2, the upper part of the rotating die holding frame is opened in the mold closed state, and the rotating die holding frame is coupled to the fixed side mold and the movable side die. As long as the interval holding member is not removed, it is difficult to detach from the mold opening / closing device as a set of molds in which the fixed mold, the rotary mold, and the movable mold are combined. In addition, since the rotating mold holding frame is supported only by the interval holding member coupled to the fixed mold and the movable mold, the mold opening / closing of the rotating mold holding frame and the rotating mold is opened and closed. Although it seems that some temporary holding is necessary at the time of attachment / detachment from the apparatus, Patent Document 2 does not have a description specifically referring to a mold replacement method based on the configuration of the disclosed multilayer molding mold. As described above, in the multilayer molding die of Patent Document 2, the die changing method is unclear, and the estimated die changing method is very difficult or takes time even if possible. There is a problem.

  Next, the injection molding machine for two-material molding in Patent Document 3 is a basic configuration of a general multilayer molding injection molding machine that uses two sets of molds, a fixed die plate (fixed platen), and a movable die plate. (Movable platen), reversing table (rotating means) disposed between the fixed die plate and the movable die plate, and can be rotated 180 degrees on the reversing table, and molds on both sides (third mold and fourth mold) Has a rotating die plate (rotary disc). Such an injection molding machine for multilayer molding includes a fixed mold (first mold or second mold), a movable mold (second mold or first mold), and a movable mold and a fixed side. This is a suitable injection molding machine for molding a multilayer molded product using molds (third mold and fourth mold) which are fitted to a mold to form a cavity. However, because it is configured as a multi-layer molding machine, it is practically difficult to make such a configuration by additional modification based on a general-purpose injection molding machine. Time is needed. In addition, since it is difficult to separate the rotary die plate to which the mold that forms the cavity by fitting with the movable side mold and the fixed side mold is attached, and the rotation driving means that rotates the rotary die plate, From a mold opening / closing means as a set of molds in which a fixed mold, a mold that fits with a movable mold and a fixed mold, and a cavity is formed, and a movable mold are combined. There is a problem that it is difficult to attach and detach.

  The present invention has been made in view of the above-described problems. Specifically, when the injection molding machine for single layer molding is diverted to the injection molding machine for multilayer molding, an additional modification to the injection molding machine is performed. Furthermore, it is an object of the present invention to provide a multilayer molding die that can be easily detached from a mold opening and closing device as a set of molds and a method for replacing the multilayer molding die.

According to the first aspect of the present invention, a first mold, a second mold moved to face the first mold, the first mold and the second mold are provided. In a multilayer molding die provided with an intermediate die that is disposed between and moved opposite to the first die and the second die, and rotated,
The intermediate mold is movably supported by the plurality of guide means disposed between the first mold and the second mold so as to face the first mold and the second mold. The rotating mold support part and the rotating mold support part are supported by the rotating mold support part so as to be rotatable about a direction substantially orthogonal to the mold opening / closing direction as a rotation axis, and are respectively matched to the first mold and the second mold A rotating mold part having at least two mold dividing surfaces, and a rotating means arranged on the rotating mold support part and rotating the rotating mold part around the rotation axis,
An intermediate mold moving means for moving the intermediate mold opposite to the first mold and the second mold is at least one of the first mold, the second mold, and the intermediate mold. The guide means is arranged in a direction parallel to the mold opening / closing direction from a mold dividing surface of at least one of the first mold and the second mold or a surface parallel to the mold dividing surface. is arranged, is achieved by the multilayer molding die to a plurality of mold guide pin der characterized Rukoto for slidably through the rotary die support portion of the intermediate mold.

That is, the intermediate mold of the multi-layer mold is composed of a rotary mold support part and a rotary mold part, and the rotary mold support part is supported between the first mold and the second mold by a plurality of guide means. The guiding means and the rotating means of the rotating mold part and the intermediate mold moving means for moving the intermediate mold so as to oppose the first mold and the second mold are arranged in the multilayer mold. This makes it possible to complete the supporting means and moving means of the intermediate mold, and the rotating means of the rotating mold part on the multilayer molding die side, making it unnecessary to add these means to the injection molding machine. In the meantime, it can be easily detached from the mold opening / closing device as a set of molds in which the first mold, the intermediate mold and the second mold are combined. Further, if the guide means is configured in this way, the injection molding machine is provided with a guide mechanism using an expensive linear motion guide member and the like for supporting the load of the intermediate mold and moving the mold in the mold opening / closing direction. At least, it is possible to carry out with a simple configuration having sufficient strength equipped in a multilayer molding die. In addition, since these guide means are arranged in the mold dividing plane or in a plane parallel to the mold dividing plane, even if all the molds are in the closed state when the mold is replaced, these guide means are It does not protrude from the outer shape, and the outer dimensions at the time of mold matching of the multilayer molding die can be reduced.

Furthermore, as shown in claim 2, the first mold and the second mold include a product cavity mold part including a product cavity part, and a mold base part to which the product cavity mold part is attached. Configured,
The rotating mold part of the intermediate mold is attached to the rotating plate having at least two mold mounting surfaces facing the first mold and the second mold, respectively, and the mold mounting surface; 2. The multi-layer mold according to claim 1, wherein the mold is composed of a third mold and a fourth mold which are combined with the product cavity mold portion to form a product cavity. .

  If the first mold and the second mold are configured in this way, it is not necessary to manufacture all of the first mold and the second mold as molds. Only the product cavity mold part needs to be manufactured for each product, and the mold size can be reduced. Similarly, if the rotating mold part of the intermediate mold is configured in this way, it is not necessary to manufacture the entire rotating mold part as a mold. Only the third mold and the fourth mold need be manufactured for each product, and the mold size can be reduced. In addition, the component members of the multi-layer molding die other than the product cavity die portion of the first and second dies and the third die and the fourth die of the intermediate die do not need to be changed for each product, The mold can be shared.

Next, as shown in claim 3 , one end of the intermediate mold moving means is fixed to at least one of the first mold, the second mold, and the intermediate mold, and the other end is opposed. It is preferable to be a multi-layer molding die according to any one of claims 1 and 2, wherein the multi-layer molding die is fixed to a mold.

  If the intermediate mold moving means is configured in this way, the intermediate mold is opposed to the first mold and the second mold at any position without providing the intermediate mold moving means on the injection molding machine side. Can be moved to.

Next, as shown in claim 4 , the intermediate mold moving means meshes with the pinion disposed on at least one of the side surface and the upper and lower surfaces of the fixing portion of the intermediate mold, The rack disposed on the first mold and the second mold constitutes a rack and pinion mechanism, and in response to the mold opening / closing movement of either the first mold or the second mold, It is a multilayer mold according to any one of claims 1 and 2, characterized in that moving the intermediate mold to the substantially middle of the second die and the first die good.

  If the intermediate mold moving means is configured in this way, no dedicated driving power or control is required for the mold opening or closing operation of the first mold or the second mold by the mold opening / closing device or the like, The intermediate mold can be moved to a substantially intermediate position between the first mold and the second mold with a simple configuration.

Next, as shown in claim 5 , the first mold, the intermediate mold, and the second mold are matched with each other and removed from the mold opening and closing device as a set of multilayer molding molds. 5. The first and second molds, the intermediate mold and the second mold, which are matched with each other outside the mold opening / closing apparatus, are attached to the mold opening / closing apparatus as a set of multilayer molding molds . The method for replacing a multilayer molding die described in any one of the above items is preferable.

Since such a mold exchange can be performed by the multilayer molding mold according to any one of claims 1 to 4, the mold exchange can be performed using existing equipment such as an overhead crane or a mold exchange device. Not only can this be easily performed, but the centering operation of the rotating mold part after the mold replacement is unnecessary, so that the time required for the mold replacement can be minimized.

A multilayer molding die according to the present invention includes a first die, a second die moved to face the first die, and between the first die and the second die. In a multilayer molding die comprising an intermediate die that is disposed, moved opposite to the first die and the second die, and rotated.
The intermediate mold is movably supported by the plurality of guide means disposed between the first mold and the second mold so as to face the first mold and the second mold. The rotating mold support part and the rotating mold support part are supported by the rotating mold support part so as to be rotatable about a direction substantially orthogonal to the mold opening / closing direction as a rotation axis, and are respectively matched to the first mold and the second mold. A rotating mold part having at least two mold dividing surfaces, and a rotating means arranged on the rotating mold support part and rotating the rotating mold part around the rotation axis,
An intermediate mold moving means for moving the intermediate mold opposite to the first mold and the second mold is at least one of the first mold, the second mold, and the intermediate mold. The guide means is arranged in a direction parallel to the mold opening / closing direction from a mold dividing surface of at least one of the first mold and the second mold or a surface parallel to the mold dividing surface. is arranged, when diverting the intermediate mold of the rotary die support portion slidably through a plurality of die guide pins der Runode, a single layer molding an injection molding machine to a multilayer molding injection molding machine In addition, additional modifications to the injection molding machine can be minimized, and furthermore, it can be easily detached from the mold opening / closing device as a set of molds.

It is the schematic which shows the mold open state of the metal mold | die for multilayer molding which concerns on Example 1 of this invention. It is the schematic which shows the mold closing state of the metal mold | die for multilayer molding which concerns on Example 1 of this invention. It is a schematic side view which shows the metal mold | die replacement | exchange of the general multilayer metal mold | die which uses 2 sets of metal mold | dies, and the multilayer metal mold | die concerning Example 1 of this invention. It is a schematic side view which shows the mold open state of the metal mold | die for multilayer shaping | molding which concerns on Example 2 of this invention. It is the schematic which shows the mold closing state of the metal mold | die for multilayer molding which concerns on Example 2 of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing a mold open state of a multilayer molding die according to Embodiment 1 of the present invention. FIG. 1A is a schematic side view, and FIG. 1B is a schematic plan view. FIG. 2 is a schematic diagram showing a closed state of the multilayer molding die according to the first embodiment of the present invention. 2 (a) is a schematic side view, FIG. 2 (b) is a schematic front view in the direction of arrows RR in FIG. 2 (a), and FIG. 2 (c) is in the direction of arrows XX in FIG. 2 (b). It is a schematic sectional drawing. FIG. 3 is a schematic side view showing mold exchange of a general multilayer mold using two sets of molds and a multilayer mold according to Example 1 of the present invention. FIG. 3 (a) is a schematic side view showing mold replacement of a general multilayer mold using two sets of molds, and FIG. 3 (b) is a multilayer mold according to Embodiment 1 of the present invention. It is a schematic side view which shows metal mold | die exchange of a type | mold.

  First, the injection molding machine 1 to which the multilayer molding die 10 is attached will be described. As shown in FIG. 1, the stationary platen 5 to which the first mold 20 is attached is fixed to the machine base portion 8. The movable platen 6 to which the second mold 40 is attached so as to face the fixed platen 5 is guided by the tie bars 9 extended from the four corners of the fixed platen 5, and the die opening and closing device 7 capable of clamping the die is used. The machine base unit 8 is disposed so as to be movable in the opening and closing direction. A multi-layer molding die 10 is attached between the fixed platen 5 and the movable platen 6 facing each other. In order to simplify the drawing, the tie bar 9 shown in the schematic plan view of FIG. 1B is not shown in the schematic side view of FIG. Also, components other than the injection apparatus and the like that are not directly related to the description of the multilayer molding die of the present invention are not shown in the drawing.

  Next, the multilayer molding die 10 will be described. As shown in FIGS. 1 and 2, the multilayer molding die 10 includes a first die 20 attached to the fixed platen 5 and a second die attached to the movable platen 6 so as to face the first die 20. The mold 40 and the intermediate mold 30 disposed between the first mold 20 and the second mold 40 are configured as a set of multilayer molding molds. Below, each metal mold | die is demonstrated.

  The first mold 20 includes a product cavity mold part 20a including a product cavity part and a mold base part 20b to which the product cavity mold part 20a is attached. The mold base portion 20b of the first mold 20 includes an intermediate mold moving means 50 for moving the intermediate mold 30 so as to face the first mold 20 and the second mold 40, and the mold base portion 20b. Are arranged in the left and right objects and substantially in the center with respect to the mold center line in the vertical direction. The intermediate mold moving means 50 is an actuator such as hydraulic, pneumatic or electric cylinder, and a suitable actuator form, quantity, arrangement, etc. are appropriately adopted depending on the size, load, moving stroke, etc. of the intermediate mold to be moved. It ’s fine. 1 and 2, the main body side 50a of the intermediate mold moving means 50 is fixed to the mold base portion 20b, and the tip of the sliding rod side 50b is fixed to the opposing intermediate mold 30. Here, if at least one end of the fixed portion to the mold at both ends of the intermediate mold moving means 50 is a free joint that allows a certain degree of eccentricity and inclination, an intermediate caused by manufacturing and assembly tolerances of related components An increase in movement resistance and galling of the mold 30 can be suppressed, and the intermediate mold 30 can be moved smoothly.

  In addition, the intermediate mold 30 is supported at two locations on the diagonal line among the four corners of the mold base portion 20 b of the first mold 20, and is opposed to the first mold 20 and the second mold 40. Guide means 60 serving as a guide to be moved is arranged to extend in a direction parallel to the mold opening / closing direction. 1 and 2, the guide means 60 is configured as a mold guide pin that penetrates the intermediate mold 30, and its length is sufficient to support and guide the intermediate mold 30 up to the mold opening limit position. In addition, at the time of mold clamping shown in FIG. 2, the end portion of the mold is accommodated in the guide means accommodation hole 63 of the mold base portion 40b of the second mold 40, and the back surface (movable platen) of the mold base portion 40b. 6 side). On the remaining diagonal lines, guide means accommodation holes 62 for accommodating the tips of the guide means 61 of the second mold 40 are arranged at the time of mold clamping.

  The basic structure of the second mold 40 is the same as that of the first mold 20, and a product cavity mold part 40a including a product cavity part and a mold base part 40b to which the product cavity mold part 40a is attached. Consists of The difference from the first mold 20 is that there is no intermediate mold moving means 50 and the guide means 61 of the second mold 40 is the first of the four corners of the mold base portion 40b of the second mold 40. The point is that it is arranged at a position not facing the guide means 60 of the mold base portion 20b of the single mold 20. On the remaining diagonal lines, as described above, the guide means accommodation hole 63 for accommodating the tip end portion of the guide means 60 of the first mold 20 at the time of mold clamping is arranged. Here, the leading end portions of the guide means 60 and 61 are equipped with a mechanical or electrical stopper (not shown) that is released when the molds are divided and prevents the mold opening beyond the mold opening limit position when combined. Needless to say.

  As shown in FIG. 2B, the intermediate mold 30 includes a rotating mold support portion 31 and a rotating mold portion 32, and guides the first mold 20 at the four corners of the rotating mold support portion 31. When the means 60 and the guide means 61 of the second mold 40 pass through, the entire intermediate mold 30 is supported, and the movement facing the first mold 20 and the second mold 40 is guided, and the above-described intermediate The mold moving means 50 is moved to an arbitrary position so as to face the first mold 20 and the second mold 40. Further, the rotating mold part 32 is attached to the rotating disk 32a having two mold mounting surfaces facing the first mold and the second mold, respectively, and the rotating disk 32a. It is comprised from the 3rd metal mold | die 33a and the 4th metal mold | die 33b which match | combine with the product cavity metal mold | die part 40a of the cavity metal mold | die part 20a and the 2nd metal mold | die 40, and form a product cavity. As shown in FIG. 2 (c), the turntable 32a has substantially the same thickness as the rotary mold support part 31, and the rotary mold support part 31 has a direction (vertical direction) substantially orthogonal to the mold opening / closing direction. The third mold 33a and the fourth mold 33b are respectively connected to the product mold of the first mold 20 by the rotation means 35 that is rotatably supported around the rotation axis and is also disposed on the rotary mold support 31. 20a and the second mold 40 are rotated or inverted to positions facing the product cavity mold part 40a.

  The rotation support member that rotatably supports the rotating disk 32a on the rotating mold support 31 is a size and load of the rotating disk 32a, the third mold 33a, and the fourth mold 33b, such as a thrust bearing and an oilless bushing. Any suitable one may be adopted depending on the support structure and the like. Further, with respect to the rotating means 35 arranged on the rotating mold support 31 for rotating the rotating disk 32a, the rotation driving means such as an electric / hydraulic motor and the rotating shaft of the rotating disk 32a are directly connected via a free joint. Structure, size, load, and support structure of the rotating plate 32a, the third mold 33a, and the fourth mold 33b, such as a structure coupled through a power transmission mechanism such as a gear, a gear and chain, a belt, and a pulley A suitable one may be adopted as appropriate. Here, a positioning mechanism (not shown) is provided between the rotating mold support portion 31 and the rotating disk 32 a, and the third mold 33 a and the fourth mold 33 b attached to the rotating disk 32 a are connected to the first mold 20. It goes without saying that the product cavity mold part 20a and the second mold 40 can be positioned at optimum positions for matching with the product cavity mold part 40a.

  Next, with reference to FIG. 3, a general multi-layer molding die using two sets of dies and a multi-layer molding die replacement according to Example 1 of the present invention will be described. As shown in FIG. 3 (a), in a multi-layer molding injection molding machine using a general multi-layer molding die that uses two sets of molds, between the fixed platen 5 and the movable platen 6, With the third mold 34a and the fourth mold 34b attached, a turntable 32a ′ capable of rotating around the vertical axis and moving in the mold opening / closing direction is disposed. In this case, the die exchange of the fixed die 21, the third die 34a and the fourth die 34b, and the movable die 41 is performed as follows. First, the mold is closed by the mold opening / closing device 7, and the fixed mold 21 and the third mold 34a, and the movable mold 41 and the fourth mold 34b are matched with each other. When aligning molds, slight misalignment caused by part machining tolerances, assembly tolerances, etc. of molds and mold opening / closing devices is not shown. It is corrected by a block or the like. Then, after mold matching, the respective molds are mechanically and electrically coupled. Next, when the fixing of the third mold 34a and the fourth mold 34b and the rotating mold support means 32a ′ is released and the movable plate 6 and the rotating mold support means 32a ′ are opened, the fixed mold is opened. 21 and the third mold 34a, and the movable mold 41 and the fourth mold 34b are supported by the fixed platen 5 and the movable platen 6, respectively. Next, using existing facilities such as an overhead crane and a mold exchanging device, one set of these molds is fixed between the fixed plate 5 and the rotary die support means 32a ', and the movable plate 6 and the rotary die support means 32a. ′ Are removed from the fixed platen 5 and the movable platen 6 as a pair of molds, that is, two sets in total.

  When attaching new molds, the two sets of molds described above are prepared in advance outside the injection molding machine, and attached to the fixed platen 5 and the movable platen 6 in the reverse order. However, at this time, the mold may be attached to the fixed platen 5 on the basis of the docking position with the injection device. However, the mold is attached to the movable platen 6 in advance on the movable platen 6 side. It is necessary to mark the position and prepare a positioning mechanism. Also, unlike the case of removal, after the attachment, the turntable 32a ′ is rotated, and the mold matching is different from the attached state, that is, the third die 34a and the movable die 41, the fourth die 34b and the fixed die. It is necessary to align the mold 21 with the mold 21 and center each mold. Thus, it is necessary to attach and detach two sets of molds instead of one set, and it is necessary to operate the injection molding machine after mounting to center the molds that were not in the mold-matching state at the time of mounting. For this reason, it takes a lot of time to change the mold of a general multilayer mold using two sets of molds.

  In contrast to a general multi-layer molding die replacement using two sets of molds shown in FIG. 3A, the multi-layer molding die replacement according to the first embodiment of the present invention is as follows. Since all means related to the support, rotation, and movement of the intermediate mold 30 are built in the multi-layer molding mold 10, as shown in FIG. Without worrying, it is easy to use the existing equipment such as an overhead crane or a mold changer, and the mold 10 for multilayer molding as a set of molds on the fixed platen 5 based on the docking position with the injection device. Can be attached. Then, the mold is closed by the mold opening and closing device 7, the second mold is fixed to the mold mounting surface of the movable platen 6 by a known means, and the molds in the multilayer molding mold 10 are disconnected from each other. The mold exchange ends. In a general multi-layer molding die replacement using the two sets of die shown in FIG. 3A, after the die is attached, the injection molding machine is further operated to operate the third die. It is necessary to center the molds by rotating the mold and the fourth mold, but this is not necessary in the multilayer molding mold according to the first embodiment of the present invention. This is because in the multi-layer molding die according to the first embodiment of the present invention, all means for supporting, rotating, and moving the intermediate die 30 are built in the multi-layer molding die 10. Prior to mounting on a molding machine, these molds are opened on a jig or the like incorporating a roller, and the rotating plate 32a of the intermediate mold 30 is rotated so that all molds are centered. It can be completed before mold change. Further, since the rotating means 35 is arranged on the rotating mold support portion 31 of the intermediate mold 30, if a necessary utility such as hydraulic pressure, pneumatic pressure, electric power, etc. is temporarily connected to the rotating means 35, the rotating disk 32a is attached. It can be arbitrarily rotated on the jig or the like. As a result, it is not necessary to center the mold after the multilayer molding die 10 is attached to the mold opening / closing device, and the time required to replace the mold of the injection molding machine can be minimized. In addition, the rotating mold part 32 of the first mold 20, the second mold 40, and the intermediate mold 30 is divided into a part including the product cavities part and a part not including the product cavities part, thereby reducing the molds manufactured for each product. The weight can be reduced, and many parts of the multilayer molding die 10 can be shared. This is effective for reducing the cost of the mold, and when preparing for mold replacement outside the injection molding machine, the mold including each product cavity part can be easily attached and detached, and easily centered. It is also effective in mold storage and management.

  A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a schematic side view showing a mold open state of a multilayer molding die according to Embodiment 2 of the present invention. FIG. 5 is a schematic view showing a closed state of a multilayer molding die according to a second embodiment of the present invention. 5 (a) is a schematic side view, FIG. 5 (b) is a schematic front view in the direction of arrows YY in FIG. 5 (a), and FIG. 5 (c) is in the direction of arrows ZZ in FIG. 5 (b). It is a schematic sectional drawing.

  The difference of the second embodiment from the first embodiment is that a rack and pinion mechanism is used instead of the actuator of the intermediate mold moving means 50 of the first embodiment. Other configurations of the multi-layer molding die and die replacement method are basically the same as those in the first embodiment, and therefore only differences from the first embodiment will be described.

  As shown in FIGS. 4 and 5, on both side surfaces of the multilayer molding die 10 ′, a pinion 70 provided at the approximate center of the rotating die support portion 31 ′ of the intermediate die 30 ′ and one end thereof are provided. A rack 81 fixed to the mold base portion 20b ′ of the first mold 20 ′ and arranged to mesh with the pinion 70 below the pinion 70, and one end of the rack base portion 40b of the second mold 40 ′. A rack-and-pinion mechanism is configured from a rack 82 that is fixed to ′ and arranged to mesh with the pinion 70 above the pinion 70. The rack 81 and the rack 82 are guided by the rack guide 83 and the rack guide 84 on the opposite sides of the tooth tip portion that meshes with the pinion 70 of the intermediate mold 30 ′, respectively. Of course, the other ends of the rack 81 and the rack 82 are not fixed. The rack 81 and the rack 82 are both arranged in parallel to the mold opening / closing direction, and the rack 82 of the second mold 40 ′ attached to the movable platen 6 moves in the mold opening / closing direction along with the mold opening / closing operation of the movable platen 6. Moved in parallel. The pinion 70, the rack 81, and the rack 82 have the same tooth tip shape, and a suitable one may be adopted as appropriate depending on the size, load, moving stroke, and the like of the intermediate mold 30 'to be moved.

  With this configuration, for example, from the mold clamping state (distance D from the fixed platen 5 to the movable platen 6) shown in FIG. 5A, the movable platen 6 is moved to the die opening limit position by a distance C as shown in FIG. When the mold is opened, the pinion 70 of the intermediate mold 30 ′ is rotated by the rack 82 of the second mold 41 that moves in the mold opening direction together with the movable platen 6, and the pinion 70 of the intermediate mold 30 ′ is rotated by the rotation. By moving the fixed first mold 21 on the rack 81 in the mold opening direction, the intermediate mold 30 ′ on which the pinion 70 is arranged is also moved in the mold opening direction. As a result, the mold opening distance between the product cavity mold part 20a ′ of the first mold 20 ′ and the third mold 33a ′ of the intermediate mold 30 ′ is A, and the product cavity mold of the second mold 40 ′. If the mold opening distance between the portion 40a ′ and the fourth mold 33b ′ of the intermediate mold 30 ′ is B, the pinion 70, the rack 81, and the rack 82 have the same tooth tip shape, so the distance A + Distance B = distance C and distance A = distance B. Of course, the relationship among the distances A, B, and C is maintained not only for the mold opening operation of the movable platen 6 but also for the mold closing operation.

  As described above, in the second embodiment, no special driving power or control such as hydraulic pressure, pneumatic pressure, electric power, or the like is required for the mold opening / closing operation of the intermediate mold 30 ′, and the mold opening / closing movement of the movable platen 6 is supported. Thus, the intermediate mold 30 ′ can be moved approximately between the first mold 21 and the second mold 41. As in the first embodiment, the mold opening / closing operation of the movable platen 6 and the mold opening / closing operation of the intermediate mold 30 ′ cannot be controlled separately. This is an effective form for simplifying the structure of the mold.

  The present invention is not limited to the above embodiment and can be implemented in various forms. For example, in the first embodiment, two actuators of the intermediate mold moving means 50 are provided on the left and right sides and substantially in the center with respect to the vertical mold center line of the mold base portion 20b of the first mold 20 of the fixed platen. Although it is arranged in the form of being arranged, it may be arranged in an up-and-down object, or may be arranged not in the mold center line but in the center of the mold and arranged at a slightly shifted position on the left and right or up and down. Furthermore, the main body side 50 a of the actuator may be arranged on the rotating mold support part 31 of the intermediate mold 30 or the mold base part 40 b of the second mold 40. Similarly, with regard to the arrangement of the rack and pinion mechanism of the second embodiment, the vertical arrangement of the rack 81 and the rack 82 may be reversed, or both sides of the rotating mold support portion 31 ′ of the intermediate mold 30 ′. In terms of surface, the vertical arrangement of the rack 81 and the rack 82 may be reversed on both the left and right sides. Further, the rack and pinion mechanism may be arranged on the upper and lower surfaces instead of the both side surfaces of the rotating mold support portion 31 ′ of the intermediate mold 30 ′. As for the arrangement and quantity of the actuators and rack and pinion mechanisms of the intermediate mold moving means 50, an optimal arrangement may be appropriately selected from various conditions such as the size of the mold for multilayer molding, the product shape, and the product take-out direction. .

  In the first embodiment and the second embodiment, the rotating disk to which the third mold and the fourth mold are attached has a rotation axis in a direction (vertical direction) substantially perpendicular to the mold opening / closing direction on the rotating mold support portion. However, it is also possible to adopt a form that is supported so as to be rotatable about a horizontal direction that is substantially perpendicular to the rotation axis. Next, the first mold, the intermediate mold and the second mold are divided into a part including the product cavity part and a part not including the product cavity part. It may be configured by a mold and a second mold, and a single rotating mold part having opposed mold dividing surfaces. If comprised in this way, the metal mold | die thickness of a 1st metal mold | die and a 2nd metal mold | die will be made thinner, the structure of a multi-layer shaping | molding metal mold | die will be simplified more easily, or a 1st metal mold | die and The effective product cavity thickness of the second mold can be increased. Furthermore, guide means that are mold guide pins are arranged so as to alternately face diagonally from both the first mold and the second mold, and the rotating mold support portion of the intermediate mold is supported. Although it was set as a form, a guide means is arrange | positioned at any one four corners of a 1st metal mold | die and a 2nd metal mold | die, and the guide means accommodation hole which accommodates these guide means in the four corners of the other metal mold | die is arrange | positioned It may be. As described above, the guide means is disposed only in one of the first mold and the second mold, and the intermediate mold moving means constituted by the actuator as in the first embodiment is a mold in which the guide means is disposed. When arranged between the molds, there is no guide means and intermediate mold moving means between the other mold and the intermediate mold when the mold is opened, which is convenient for product removal.

  With the multilayer molding die according to the present invention, when a single-layer molding injection molding machine is diverted to a multilayer molding injection molding machine, additional modifications to the injection molding machine can be minimized. As described above, the mold can be easily detached from the mold opening and closing device. In particular, the fact that a general-purpose single-layer injection molding machine can be easily remodeled into a multilayer injection molding machine with a commercially available additional injection unit has the effect that it can be easily returned to the single-layer injection molding machine. In other words, it is not necessary to introduce an expensive injection molding machine dedicated to multilayer molding, and it is possible to use a single-layer injection molding device at a low cost for single-layer molding and multilayer molding according to demand. Industrial value is extremely high for manufacturers.

10 Multilayer Mold (Example 1)
10 'Multi-layer Mold (Example 2)
20 First mold (Example 1)
20a Product cavity mold part (first mold / Example 1)
20b Mold base (first mold / Example 1)
20 '1st mold (Example 2)
20a 'Product cavity mold part (first mold / Example 2)
20b 'mold base (first mold / example 2)
30 Intermediate mold (Example 1)
30 'intermediate mold (Example 2)
31 Rotating mold support (intermediate mold / Example 1)
31 'Rotating mold support (intermediate mold / Example 2)
32 Rotating mold part (Intermediate mold / Example 1 / Example 1)
32a Turntable (Rotating mold / Intermediate mold)
33a Third mold (Rotary mold part / Intermediate mold / Example 1)
33a ′ third mold (rotary mold part / intermediate mold / Example 2)
33b Fourth mold (Rotary mold part / Intermediate mold / Example 1)
33b ′ Fourth mold (Rotary mold part / Intermediate mold / Example 2)
35 Rotating means (intermediate mold)
40 Second mold (Example 1)
40a Product cavity mold part (second mold / Example 1)
40b Mold base (second mold / Example 1)
40 'second mold (Example 2)
40a ′ Product cavity mold part (second mold / Example 2)
40b 'mold base (second mold / example 2)
50 Intermediate mold moving means 60 Guide means (first mold side)
61 Guide means (second mold side)
70 Pinion (Intermediate mold / Example 2)
81 racks (first mold / example 2)
82 racks (second mold / example 2)

Claims (5)

A first mold, a second mold moved to face the first mold, and the first mold and the second mold, the first mold and the second mold In a multilayer mold having an intermediate mold that is moved and rotated opposite to two molds,
The intermediate mold is movably supported by the plurality of guide means disposed between the first mold and the second mold so as to face the first mold and the second mold. The rotating mold support part and the rotating mold support part are supported by the rotating mold support part so as to be rotatable about a direction substantially orthogonal to the mold opening / closing direction as a rotation axis, and are respectively matched to the first mold and the second mold A rotating mold part having at least two mold dividing surfaces, and a rotating means arranged on the rotating mold support part and rotating the rotating mold part around the rotation axis,
An intermediate mold moving means for moving the intermediate mold opposite to the first mold and the second mold is at least one of the first mold, the second mold, and the intermediate mold. The guide means is arranged in a direction parallel to the mold opening / closing direction from a mold dividing surface of at least one of the first mold and the second mold or a surface parallel to the mold dividing surface. is arranged, multi-layer molding die and said plurality of mold guide pins der Rukoto slidably through the rotary die support portion of the intermediate mold. The first mold and the second mold are composed of a product cavity mold part including a product cavity part, and a mold base part to which the product cavity mold part is attached,
The rotating mold part of the intermediate mold is attached to the rotating plate having at least two mold mounting surfaces facing the first mold and the second mold, respectively, and the mold mounting surface; The multi-layer molding die according to claim 1, comprising a third die and a fourth die which are matched with the product cavity die portion to form a product cavity. The intermediate mold moving means has one end fixed to at least one of the first mold, the second mold and the intermediate mold, and the other end fixed to an opposing mold. The multilayer molding die according to any one of claims 1 and 2 . The first mold and the second mold are arranged so that the intermediate mold moving means meshes with the pinion disposed on at least one of a side surface and an upper and lower surface of the fixed portion of the intermediate mold. A rack and pinion mechanism is configured with the rack disposed on the first mold and the second mold in response to mold opening / closing movement of the first mold and the second mold. The multi-layer molding die according to any one of claims 1 and 2, wherein the die is moved substantially in the middle of the second die. The first mold, the intermediate mold, and the second mold are combined, removed from the mold opening / closing device as a set of multilayer molding molds, and previously combined outside the mold opening / closing device. the first mold and the intermediate mold and the second mold, gold multilayer molding according to any one of claims 1 to 4 attached to the mold opening and closing device as a set of multi-layer molding die Mold exchange method.

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