JP4044516B2 - Mold for composite molding - Google Patents

Description

  The present invention relates to a composite molding die for molding a composite molded product in which synthetic resins of different types of materials are alternately injected and integrated. More specifically, a plurality of molds that can move forward and backward are provided on the movable mold, and after forming a primary molded product, synthetic resins of different types of cavities formed in accordance with the forward and backward movement of the molds. It is related with the metal mold | die for composite molding which enables the shaping | molding of the composite molded product which inject | poured and shape | molded the secondary molded product and integrated with the primary molded product.

  2. Description of the Related Art Conventionally, generally in a mold apparatus, a resin or the like is usually inserted into a cavity of a molding die and solidified, and then the molding die is opened to take out a molded product. This molded product is usually molded by injection of one type of synthetic resin, but different types of synthetic resin are injected in different steps and are integrally molded. For example, it is used for automobile parts and electrical products.

  Some automotive parts, if seat parts, are made of a hard material for the part to be attached to the vehicle body, and a part that comes in contact with the hand is made of a soft material such as an elastomer. . Conventionally, a hard molded product and a soft molded product molded with different molds are integrated by bonding or welding.

  Also, by sharing the fixed mold and making the movable mold different, and replacing the movable mold, the hard and soft materials are injected and integrated. The molded product was molded. Furthermore, a slide part that can be moved back and forth is enclosed in a part of the mold on the movable side, and synthetic resin of different types of materials is separately injected to form an integrated molded product by switching the forward and backward movement of this slide part. A typical composite mold has also been proposed.

JP-A 61-108519

Japanese Patent Laid-Open No. 10-278076

JP 2003-39497 A

  The conventional molding method requires separate similar molds separately, which increases the cost and requires a large number of man-hours. The method such as bonding requires individual independent dies, and a process of bonding or welding molded products as individually molded parts is necessary. This process requires man-hours for post-processing such as positioning and improving the appearance after completion.

  The method of preparing and molding a plurality of movable molds using different molds on the movable side for composite molding has inevitably increased cost. Furthermore, the conventional method of enclosing the slide parts in the mold is to enclose in the movable mold, which may be difficult to install depending on the shape of the movable mold, and the mold of the cavity part There are problems such as difficulty in cooling. Moreover, it is limited to a molded product that can be easily opened, and there is a problem in terms of maintenance.

  Such a conventional method is economically problematic because of its complicated configuration and high cost. The applicant has proposed a mold technique for solving these problems (see Patent Document 3). The mold for composite molding described in this document is a mold that is provided on a movable mold and can be slid and rotated, and can mold synthetic resins of different materials integrally. Although this technique has a structure that is effective as it is, there are limitations on the shape of secondary molded products made of different materials, and there is a difficulty in making complex composite molded products impossible. Also, the configuration tended to be somewhat complicated. That is, for example, when the integrated secondary molded product has an undercut shape, it is impossible to slide it with a single mold to open and close it. However, there are a wide variety of composite molded products, and there is a demand for a mold that can perform two-color molding with high efficiency even with a molded product having an undercut.

  The present invention is configured by improving the above technology based on the above technical background, and achieves the following object. An object of the present invention is to provide a mold for composite molding that is capable of high-productivity and can be integrally molded with good appearance even if it is an undercut molded product that is not restricted by shape. Another object of the present invention is to divide a part of the movable side mold so that a synthetic resin of a different kind of material can be injected so that each can be slid or swingable, and the structure is simple and economical. The purpose of this is to provide a mold for composite molding.

The present invention adopts the following means in order to achieve the object.
Double syn- mold of the present invention 1,
In the composite molding mold for a molded article which is integrally formed with a undercut portions with different materials synthetic resin, and fixed mold attached to the stationary platen of the injection molding machine, the stationary mold A movable-side mold movable relative to the movable-side mold, and the movable-side mold is provided so as to be opened and closed by a swinging motion around a first support shaft, and the movable side for a primary molded product A pair of first molds that swing and open and close without interfering with the molds, and when the pair of first molds are in a closed state, the pair of first molds and the fixed-side mold A mold and a first cavity formed by the movable mold, a first cylinder for opening and closing the first mold around the first support shaft , the first mold and the first a first driving device configured to have a first link ends to the cylinder is rotatably coupled, the said movable mold Openably provided in a rocking motion which about the shaft, and a second mold a pair of opening and closing swings without interfering with the molded in the first cavity the primary molded article When the pair of second molds are in a closed state, the pair of second molds, the fixed-side mold, and the movable-side mold are formed and communicated with the first cavity. and 2 cavity, a second cylinder for causing opening and closing the second mold about said second pivot, a second link ends to said second mold and said second cylinder is rotatably coupled consists of a second driving device configurations having said when opening a pair second mold, the said 1 said pair of first mold formed closed at swinging movement first cavity by injection either of synthetic resin material different molding the primary molded article, then, the first of said pair The mold is opened, the other synthetic resins of the different material to the pair of second said mold is formed closed at the rocking operation the second cavity by injection, the other synthetic resin to said primary molded article It is characterized in that it is possible to mold an integrated molded product by fusing .

Double syn- mold of the present invention 2, in the present invention 1,
The first driving device or the second driving device is a device that drives a pair of molds with one driving device.

Double syn- mold of the present invention 3, in the present invention 1,
Composite molding mold, the combination of the second mold of the pair and the first mold of the pair is characterized in that has a structure which is provided a plurality.

Double syn- mold of the present invention 4, in the present invention 1,
A first gate for injecting synthetic resin into the first cavity to the fixed mold is used to inject synthetic resin into the second cavity into the fixed mold and the pair of second molds. The second gate is provided.

  As described in detail above, since the present invention is configured to provide a pair of molds that can move forward and backward on the movable mold so that composite molding can be performed, even a molded product having an undercut portion can be used. Composite molding is possible, productivity is high, complex composite molding is possible, and good-looking integral molding can be achieved. In addition, simple structure and economical composite molding became possible.

  Next, an embodiment of the present invention will be described. The figure shows the configuration of the composite molding die in the injection molding machine of the present invention. In order to facilitate understanding of the present invention, an example of a molded product having no undercut portion in an embodiment of a simple configuration. Will be described first. FIG. 1 shows a part of a composite molded product 1 having no undercut portion formed by a composite molding die.

  The composite molded article 1 is composed of synthetic resins of different materials, one of which is hard and the other is made of a synthetic resin of a flexible material, and is integrated at the molding stage. This composite molded product 1 is a soft synthetic resin that is a rubber body in the part where a person contacts the primary molded product, or a soft synthetic resin that covers a hard body. It is provided as part of a secondary molded product and integrated as a secondary molded product, and is generally known as a two-color molded product.

  FIG. 1 shows a hard primary molded product 1a integrated with a soft secondary molded product 1b at the molding stage. In the mold to be molded, in the present embodiment, the portion corresponding to the primary molded product 1a is the first cavity 2 and the portion corresponding to the secondary molded product 1b is the second cavity 3 (see FIG. 4). The mold for molding the composite molded product 1 is provided with two core-shaped slide molds, which will be described later, and moves forward and backward in the direction of the arrow. FIG.2 and FIG.3 is explanatory drawing which shows the metal mold | die structure for shape | molding this composite molded product 1, and has shown typically metal mold | die structure with sectional drawing.

  FIG. 2 shows a mold configuration for molding the primary molded product 1a, and FIG. 3 shows a mold configuration for molding the secondary molded product 1b. 4 is a cross-sectional view taken along line XX in FIG. FIG. 5 shows a YY cross-sectional view of FIG. This mold is composed of a fixed mold 4 and a movable mold 5, and the first cavity 2 and the second cavity 3 are formed by these two molds. FIG. 2 and FIG. 3 show a configuration in which a movable mold 5 is provided with slide molds having two cores so as to be able to advance and retreat, respectively, and is opposed to the fixed mold 4.

  In the figure, a first slide mold 6 is provided on a movable mold 5 so as to be able to advance and retreat, and is driven by a first drive device 7 provided at the rear. The first slide mold 6 is moved forward and backward by being guided by a guide body (not shown) or a guide groove of the movable mold 5. This forward / backward configuration is the same for the second slide mold 8. The second slide mold 8 is provided so as to be able to advance and retract in the same manner as the first slide mold 6 by changing the advancing / retreating direction to the first slide mold 6 and is driven by a second driving device 9 provided at the rear part. FIG. 2 shows a state in which the first slide mold 6 has advanced, the mold is closed, and the first cavity 2 is formed. At this time, as illustrated by a two-dot chain line, the second slide mold 8 is moved backward.

  When the primary molded product 1a is molded, as shown in FIG. 4, a hard synthetic resin is injected into the first cavity 2 by the gate 10 provided on the fixed mold 4 to mold the primary molded product 1a. . FIG. 3 shows a state in which the first slide mold 6 is moved backward and the second slide mold 8 is moved forward to form the second cavity 3 after the primary molded product 1a is formed in the configuration of FIG. ing.

  In the present embodiment, the second cavity 3 is provided in communication with the end of the primary molded product 1a. In this state, the second molded article 1b is formed by injecting a soft synthetic resin into the second cavity 3 by the second gate 11 provided in the fixed mold 4. In this molding, since the gate 12 is also provided in the second slide mold 8 as shown in FIG. 5, the synthetic resin is injected into the second cavity 3 through the gates 11 and 12. When this soft synthetic resin is injected into the second cavity 3, a secondary molded product 1b fused and integrated with the primary molded product 1a is molded.

  When the secondary molded product 1b is molded, the molded product is completed as a composite molded product 1. Therefore, the movable mold 5 is opened from the fixed mold 4 and the composite molded product 1 is taken out. In this way, a composite molded product 1 integrated with different synthetic resins is formed. The structure of this injection mold is intended for a comparatively simple molded product as described above. All the molds are driven only by advancing and retreating operations, and the mold configuration itself is simple. The basic configuration using the two slide molds has been described above. Next, an example of a molded product having an undercut portion will be described.

  6 is a plan view of the composite molded product 13 having an undercut portion, and FIG. 7 is a ZZ sectional view of FIG. This molded product 13 is a substantially circular part, and a B side of a configuration partitioned by a straight line D passing through the center O has a shape 13c in which a part is opened. Further, the B side extends continuously from the A side portion beyond the straight line D, and a curved line is drawn on the inside as shown in the figure. The secondary molded product 1b is integrated with the primary molded product 1a so as to cover the circumferential edge. Therefore, since there is an overhanging part, if the molding method is the same as the above-described configuration, the mold part along the B side molded product will interfere if the mold is moved forward and backward in the F direction on the A side, for example. Can not open and close to the A side. Accordingly, the B side is an interference region with respect to the A side, and this shape cannot be molded with the above-described mold configuration.

  In the present invention, this B-side interference region is defined as an undercut portion. As described above, when the mold is opened, a part of the mold interferes with the molded product or the mold, and is referred to in comparison with the conventional mold configuration. If the A side is an interference region with respect to the B side, the A side is an undercut portion. Unlike the above-described configuration, the composite molded product 13 forms a secondary molded product 13b so as to cover the primary molded product 13a. In the composite molded product 13, the primary molded product 13a is formed on a mold. A first cavity 14 having an interference area for the second molding 13b is formed, and a second cavity 15 having an interference area for the secondary molded product 13b is formed. In any case, it is impossible to form a cavity for the primary molded product 13a and the secondary molded product 13b with one mold configuration for the composite molded product 13.

  8 and 9 show a mold that enables molding of a molded product having an undercut portion. Although a detailed description of the basic configuration is omitted, this mold is installed and used in an injection molding machine. In order to facilitate understanding, the configuration in the figure is a schematic configuration diagram for explaining a mold part that becomes a core in which a part of the movable mold is movable. Each mold of the present embodiment has a pair of mold configurations that are divided into a pair of two molds. Each of these molds swings about a support shaft so as to be able to advance and retract.

  FIG. 8 shows a state in which the pair of first molds 16a and 16b constituting the first cavity 14 for the primary molded product 12a is closed. The synthetic resin is injected through the gate 10 as described above. The pair of first molds 16a and 16b is configured to swing and open about the support shafts 17a and 17b, respectively, and shows a state where the position of the two-dot chain line is open. As shown in the figure, this swinging operation will be described with respect to one first mold 16a of the pair of first molds 16a and 16b. The position of the end portion P of the composite molded product 13 and the intermediate position on the support shaft side The space between Q is a semicircular arc shape, and if it is at the P position, the first mold 16a opens and closes in a direction perpendicular to the straight line connecting the P position and the support shaft 17a. In this opening and closing direction, the first mold 16a can be opened and closed without interfering with the movable mold 5 for the primary molded product 13a. The same applies to the other first mold 16b of the pair of first molds 16a and 16b.

  By adopting a pair of molds as described above, each of the pair of first molds 16a and 16b can be opened and closed without interference. The pair of first molds 16a and 16b are individually driven by cylinders 18a and 18b provided individually. That is, pins 19a and 19b are provided at the ends of the pair of first molds 16a and 16b, and links 20a and 20b are rotatably coupled to the pins 19a and 19b.

  The links 20a and 20b are rotatably connected to rods 18c and 18d of the cylinders 18a and 18b. The rods 18c and 18d of the cylinders 18a and 18b move straightly during driving, while the pair of first molds 16a and 16b swings. However, the deviation of this movement is caused by the rotation of the links 20a and 20b. Absorb by movement. Therefore, even if the pair of first molds 16a and 16b is swinging, there is no problem in opening and closing. FIG. 10 partially shows a cross section in a state where the pair of first molds 16a and 16b is closed. This corresponds to FIG.

  FIG. 9 shows a state in which the pair of second dies 21a and 21b constituting the second cavity 15 for the secondary molded product 13b is closed. The synthetic resin is injected through the gates 11 and 12 as described above. The basic configuration is the same as that of the primary molded product 13a. The pair of second molds 21a and 21b is configured to swing and open around the support shafts 22a and 22b, respectively, and shows a state where the position of the two-dot chain line is open. This swinging operation will be described with respect to one second mold 21a of the pair of second molds 21a and 21b in the figure. A semicircle is formed between the intermediate position R of the molded product and the end position S on the support shaft side. In the case of the R position, the mold opens and closes in a direction perpendicular to the straight line connecting the R position and the support shaft. In this opening and closing direction, the second mold 21a can be opened and closed without interfering with the movable mold 5 for the primary molded product 13a and the primary molded product 13a. The same applies to the other second mold 21b of the pair of second molds 21a and 21b.

  Thus, since the pair of second molds 21a and 21b is also configured as a pair of molds, each of the pair of second molds 21a and 21b opens and closes without interference. be able to. The pair of second dies 21a and 21b are driven by cylinders 23a and 23b provided individually as described above. That is, pins 24a and 24b are provided at the ends of the pair of second molds 21a and 21b, and links 25a and 25b are rotatably coupled to the pins 24a and 24b. The links 25a and 25b are rotatably coupled to rods 23c and 23d of the cylinders 23a and 23b.

  The rods 23c and 23d of the cylinders 23a and 23b move straightly during driving, while the pair of second molds 21a and 21b swings. However, the deviation of this movement is caused by the rotation of the links 25a and 25b. Absorb by movement. Therefore, there is no hindrance to opening and closing even if the pair of second molds 21a and 21b is swinging. The links 25a and 25b and the cylinders 23a and 23b are arranged so as not to interfere with the links 20a and 20b and the cylinders 18a and 18b of the pair of first molds 16a and 16b. FIG. 11 partially shows a cross section of the pair of second molds 21a and 21b in a closed state. This corresponds to FIG.

  The pair of first molds 16a and 16b and the pair of second molds 21a and 21b are oscillated with respect to each other, and when the pair of first molds 16a and 16b is closed, the pair of second molds 16a and 16b is closed. The molds 21a and 21b are open, and when the pair of first molds 16a and 16b are open, the pair of second molds 21a and 21b is closed, and the molds of each other are used during the opening / closing operation. To prevent interference.

As described above, the configuration in which the cylinders are provided and driven in the individual molds of each pair of molds has been described, but the pair of molds can be driven by one cylinder. Next, an example of the configuration will be described.
FIG. 12 is a configuration example in which a pair of first molds 16a and 16b is driven by a single cylinder 26, and shows a state in which the pair of first molds 16a and 16b are closed. In this configuration, two links 27a and 27b are coupled to the rod 26a of the cylinder 26, and the respective molds of the pair of first molds 16a and 16b are simultaneously driven by the forward and backward movement of the rod 26a. That is, the pair of first molds 16a and 16b is swung through the links 27a and 27b and the support shafts 28a and 28b by the forward and backward movement of the rod 26a. Since this configuration requires only one drive source, the mold configuration is simplified.

  Although not shown, this configuration is the same for driving the pair of second molds 21a and 21b. However, the links 27a and 27b and the cylinder 26 of the pair of first molds 16a and 16b and the link and cylinder of the pair of second molds 21a and 21b are arranged at the intersections, so that interference is avoided. Design is needed. In the case of this configuration example, the pair of molds fits the molded product in the closed state because there is a slight deviation compared to the case where the driving device is individually provided for the opening and closing operation of the pair of molds It is necessary to determine the installation direction of the link or cylinder.

  Further, although not shown, a pair of molds may be slid by a rectilinear operation instead of a swinging operation. In this case, the pair of first molds 16a and 16b and the pair of second molds 21a and 21b must not interfere with each other during the opening / closing operation. For example, by using a cam mechanism having a cam and a cam groove, the moving mold is retracted to a position where it does not interfere, and the two pairs of molds are moved forward and backward without interfering with each other. It is possible.

  That is, when opening one pair of molds, the position of the pair of molds is changed during the moving operation and retracted, and then the other pair of molds is moved and closed. Even in this configuration, a molded product having an undercut portion can be molded. Even in the case of linear movement, it is possible to perform a pair of molds with a single drive source if, for example, a rack and pinion mechanism is applied between the drive source and the pair of molds.

  As described above, the embodiment of the present invention has been described with respect to one composite molded product. However, a mold having a plurality of pairs of molds and a set state so that two or more composite molded products can be molded. It may be a configuration. For example, although omitted in the present embodiment, one set of the configuration described above is provided on the left side of FIGS. In this embodiment, there are two sets, but a configuration in which a plurality of sets are used as in this case is effective in improving production efficiency.

  Although various forms have been described above, it is needless to say that the present invention is not limited to the description of the examples and can be applied to various forms of molded articles. In the present embodiment, the method of driving the mold via a link between a pair of molds and the cylinder has been described. However, the cylinder is a trunnion type in which the cylinder itself swings and operates. May be. The cylinder pressure medium may be hydraulic or pneumatic. Further, the pair of first molds and the pair of second molds are different in shape, but may be reversed for the primary molded product and the secondary molded product.

FIG. 1 is a partial view showing a simple example of a composite molded product molded by a composite molding die. FIG. 2 is an explanatory diagram of a mold configuration showing a state in which the first cavity is closed by the first slide mold and a primary molded product is molded. FIG. 3 is an explanatory diagram of a mold configuration showing a state in which the second cavity is closed by the second slide mold and a secondary molded product is molded. 4 is a cross-sectional view taken along line XX in FIG. 5 is a cross-sectional view taken along line YY of FIG. FIG. 6 is a plan view showing a form of a composite molded product having an undercut portion, which is a molded product to be an object of the present invention. 7 is a ZZ cross-sectional view of FIG. FIG. 8 is a plan view showing a state in which the pair of first molds for the primary molded product is closed. FIG. 9 is a plan view showing a state in which the pair of second dies for the secondary molded product is closed. 10 is a cross-sectional view taken along the line VV in FIG. FIG. 11 is a WW sectional view of FIG. FIG. 12 is a plan view showing a state in which a pair of molds are closed by one drive source.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,13 ... Composite molded article 2,14 ... 1st cavity 3,15 ... 2nd cavity 4 ... Fixed side metal mold | die 5 ... Movable side metal mold 10, 11, 12 ... Gate 16a, 16b ... One pair 1st metal mold | die Molds 17a, 17b, 22a, 22b, 28a, 28b ... support shafts 18a, 18b, 23a, 23b, 26 ... cylinders 19a, 19b, 24a, 24b ... pins 20a, 20b, 25a, 25b, 27a, 27b ... links 21a, 21b ... a pair of second molds

Claims (4)

In the composite molding mold for a molded article which is integrally formed with a undercut portions with different materials synthetic resin,
A fixed mold attached to a fixed plate of an injection molding machine;
A movable mold that is movable relative to the fixed mold;
A pair of movable side molds that can be opened and closed by a swinging motion about a first support shaft , and that swing and open without interfering with the movable side mold for a primary molded product . The first mold of
A first cavity formed by the pair of first molds, the fixed mold, and the movable mold when the pair of first molds are in a closed state;
A first cylinder for opening and closing the first mold around the first support shaft; and a first link having both ends rotatably coupled to the first mold and the first cylinder. A first drive device;
The movable side mold is provided so as to be opened and closed by a swinging motion centered on a second support shaft , and swings and opens without interfering with the primary molded product formed in the first cavity. A pair of second molds;
When the pair of second molds are in a closed state, the second mold is formed of the pair of second molds, the fixed mold, and the movable mold, and communicates with the first cavity. With the cavity ,
A second cylinder configured to open and close the second mold around the second support shaft; and a second link having both ends rotatably coupled to the second mold and the second cylinder. A second drive unit,
Wherein when opening the pair second mold, said injection of one of the synthetic resin of the different material to the one said pair of first mold formed closed at swinging movement first cavity Forming a primary molded product, and then opening the pair of first dies and closing the pair of second dies by a swinging operation, the second cavity formed by the other of the different materials. Synthetic resin is injected, and the other synthetic resin is fused to the primary molded product so that a molded product can be molded .
A mold for composite molding characterized by the above. In double syn- mold according to claim 1,
Said 1st drive device or said 2nd drive device is an apparatus which drives a pair of metal mold | dies with one drive device. The metal mold | die for composite molding characterized by the above-mentioned. In double syn- mold according to claim 1,
Composite molding die, the composite mold, characterized in that the combination of the second mold of the pair of first mold of the pair is a construction which is provided a plurality. In double syn- mold according to claim 1,
A first gate for injecting synthetic resin into the first cavity to the fixed mold is used to inject synthetic resin into the second cavity into the fixed mold and the pair of second molds. A mold for composite molding, characterized in that a second gate is provided.

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