JP2006321142A - Mold structure for complex molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold structure for complex molding which can enhance the degree of freedom of the molded shape and costs low. <P>SOLUTION: In the mold structure 1, the core mold 3 is arranged movably to the cavity mold 2 and the cavity 5 is formed between the both molds. The cavity mold 2 is split into the lower mold 21 and the upper mold 22 as sandwiching the slide core 4, and the slide core 4 can block the middle by protruding in the cavity 5. In such a state that the lower mold 21, core mold 3 and slide core 4 enclose the lower cavity 51, the lower trim 71 is molded, thereafter in such a state that the slide core 4 is retreated from the cavity 5 and the upper mold 22 is lowered, the upper trim 72 is molded, and thus the door trim 7 is formed by the composite molding. Further, the core mold 3 is provided with the retreatable averting core 31, and when the upper mold 22 moves, its interfering with the core mold 3 is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mold structure for composite molding in which parts of molded products are molded with different materials, colors, and the like.

  There are various methods for producing a composite molded product in which the resin molded product parts are molded with different materials, colors, and the like. The method of separately molding a plurality of parts of a molded product and bonding them by welding or the like requires a facility for welding in addition to the molding machine, and there is a problem that costs increase. In addition, once the molded parts are joined in a separate process, special measures are required for the equipment and jigs required for joining in order to maintain the positional accuracy of each other after joining. I was invited.

  On the other hand, as a molding method for joining the parts of the molded product in the mold, a pair of molds that can move relative to each other and a slide core in the mold are movably provided. A part of a molded product is formed by a pair of molds and a slide core, and then the remaining part of the molded product is molded and the parts are joined together with the slide core retracted from the cavity. (For example, refer to Patent Document 1). According to this method, since no special equipment other than the molding machine is required, both parts are joined while molding each part at a low cost, so a special measure for maintaining the accuracy of the joining position is required. It is an excellent method.

However, in this method, when the remaining part of the molded product is molded, the shape of the part is automatically determined by the space formed by retracting the slide core, and the molded product is joined. It was not possible to give the part shape freedom. In particular, when the molded product includes a design surface, the lack of flexibility in the shape has been a big problem from the point of appearance of the molded product.
JP 2003-127173 A (FIGS. 8 and 9)

  The present invention has been completed based on the above circumstances, and an object thereof is to provide a mold structure for composite molding that can give a molding shape a degree of freedom and is low-cost. To do.

  As means for achieving the above object, the invention of claim 1 is characterized in that a first mold and a second mold that are arranged so as to be movable relative to each other and surround a space by both to form a cavity, and the first mold A slide core formed so as to be movable in the mold and projecting into the cavity and closing the middle of the cavity; and the cavity is formed by the first mold, the second mold and the slide core. Forming a part of the molded product in a state of enclosing a part of the molded product, and then molding the remaining part of the molded product with the slide core retracted from the cavity. In a mold structure for combined molding, the first mold is divided so as to sandwich the slide core, and one of the pair of divided molds is used as the slide mold. The remaining part of the molded product is molded in a state where the divided molding dies are brought into contact with each other after the slide core is retracted from the cavity. The mold structure for the composite molding was characterized.

  According to the invention of claim 2, when one of the divided molds moves, in order to prevent this from interfering with the second mold, the second mold or the divided molds 2. A mold structure for composite molding according to claim 1, wherein a retractable avoiding core is provided on one of the two.

  The invention according to claim 3 is characterized in that a positioning portion for holding each other's position is formed in the contact portion of the pair of divided molds. A mold structure for composite molding was adopted.

<Invention of Claim 1>
After the first mold is divided so as to sandwich the slide core, one of the divided molds can be moved in a direction different from the moving direction of the slide core, and the slide core is retracted from the cavity In the state where the divided molds are in contact with each other, the remaining part of the molded product is molded, so that one of the divided molds can be used to join the remaining part of the molded product. The shape can be formed and the shape can be freely changed.

<Invention of Claim 2>
When one of the divided molds moves, a retractable avoidance core is provided on one of the second mold or the divided molds to prevent this from interfering with the second mold. As a result, the molded product can be shaped more freely without worrying about interference between the molds.

<Invention of Claim 3>
Since the positioning portions for holding the positions of each other are formed on the contact portions of the pair of divided molds, there is little positional deviation between the portions of the molded product, and the quality can be improved. .

  An embodiment of the present invention will be described with reference to FIGS. In the description, the right side in FIG. 1 is the front side of the cavity mold 2 and the left side is the front side of the core mold 3. A mold structure 1 shown in FIG. 1 is for molding a vehicle door trim 7. The door trim 7 is attached to the interior side surface of a vehicle door (not shown), and is formed by a lower trim 71 and an upper trim 72 as shown in FIGS. The lower trim 71 located below is integrally formed of a thermoplastic synthetic resin material such as polypropylene, and is similarly formed of a thermoplastic synthetic resin material, and an upper trim 72 disposed above, It is connected at the coupling portion 7a. The lower trim 71 and the upper trim 72 are formed of resin materials different from each other, or are formed of resin materials of different colors, and the door trim 7 is a so-called composite molded product.

  The cavity mold 2 and the core mold 3 of the mold structure 1 are arranged to face each other, and in the mold closed state, a space is surrounded by both, and a cavity 5 is formed therebetween. The cavity mold 2 corresponds to a first mold of the present invention, which is divided into a lower mold 21 and an upper mold 22 so as to sandwich a slide core 4 described later. The lower mold 21 faces the left end surface of the core mold 3 and is a part of the cavity 5, and forms a lower cavity 51 for molding the lower trim 71. An injection holder 21a extending in the vertical direction is provided at the left end portion of the lower mold 21, and a pair of injection machines 6a and 6b are attached to the upper and lower sides thereof. The lower mold 21 has a resin introduction path 21b extending left and right so as to guide the resin material injected from the injection machine 6a into the lower cavity 51. Communicate.

  The upper die 22 is disposed so as to be movable in the vertical direction (direction different from the moving direction of the slide core 4) between the injection holder 21a and the core die 3 by a hydraulic cylinder (not shown) provided above. . The upper die 22 faces the left end surface of the core die 3 and is the remaining portion of the cavity 5, and forms an upper cavity 52 for molding the upper trim 72. Similarly to the lower mold 21, the upper mold 22 has a resin introduction path 22a extending left and right so as to guide the resin material injected from the injection machine 6b into the upper cavity 52. As shown in FIG. With the upper mold 22 in contact with the lower mold 21, the upper mold 22 communicates with the discharge port 21 a 2 formed in the injection holder 21 a.

  The upper die 22 is in contact with the lower die 21 on the lower surface, and a plurality of protrusions 22b are formed at the contact portion. These engage with a plurality of alignment grooves 21 c formed on the upper surface of the lower mold 21, respectively, so that when the upper trim 72 is formed, the resin material pressure generated by the injection machine 6 b is applied to the upper mold 22. However, the positions of the lower mold 21 and the upper mold 22 are held, and the occurrence of displacement between them is prevented. The alignment groove 21c and the protrusion 22b correspond to the positioning portion of the present invention.

  A slide hole 21a3 penetrates the injection holder 21a in the lateral direction, and the slide core 4 is accommodated therein. The slide core 4 is connected to a hydraulic cylinder (not shown) at the left end in FIG. 1 and is movable in the left-right direction. In a state where the contact with the lower mold 21 is released and the upper mold 22 moves upward, the slide core 4 moves rightward between the lower mold 21 and the upper mold 22 and protrudes into the cavity 5. Then, it is possible to close the middle (shown in FIG. 5).

  On the other hand, the core mold 3 corresponds to a second mold of the present invention, and the right end thereof is connected to a hydraulic cylinder (not shown) and is disposed so as to be movable relative to the cavity mold 2 in the left-right direction. An avoidance hole 3a is formed in the core mold 3, and an avoidance core 31 whose right end is connected to a hydraulic cylinder (not shown) is accommodated in the core mold 3 so as to be movable in the left-right direction with respect to the core mold 3. Has been. The avoidance core 31 is disposed so as to be retractable to the right in order to prevent interference when the upper mold 22 moves in the vertical direction. As shown in FIG. 1, the avoidance core 31 is part of the upper cavity 52 together with the upper mold 22. Is forming. Note that a stepped portion 31a is formed in the avoidance core 31, and the foremost position is determined by contacting the stepped portion 3a1 of the stepped shape of the avoidance hole 3a.

  Next, based on FIG. 4 thru | or FIG. 9, the shaping | molding method of the door trim 7 by the type | mold structure 1 is demonstrated. As shown in FIG. 4, before molding, the core mold 3 is retracted with respect to the cavity mold 2 and is in the mold open state, and the upper mold 22 of the cavity mold 2 is in the raised position. The slide core 4 is between the lower mold 21 and the upper mold 22 and is in contact with both, and the front end portion of the slide core 4 protrudes from the front surface of the lower mold 21. Further, the avoidance core 31 is retracted from the front surface of the core mold 3.

  From this state, the core mold 3 is moved forward toward the cavity mold 2 and is brought closer until the front end portion of the slide core 4 comes into contact with the front surface of the core mold 3 (shown in FIG. 5). Thereby, the lower mold | type 21, the core type | mold 3, and the slide core 4 mutually engage fluid-tightly, and the lower cavity 51 is formed by these. Accordingly, the shape of the upper end portion of the lower trim 71 is determined by the shape of the slide core 4. Thereafter, the molten resin material is injected by the injection machine 6a and filled into the lower cavity 51 through the resin introduction path 21b. After filling the resin material, the core mold 3 and the cavity mold 2 are kept closed for a predetermined time, pressure is applied to the resin material, and after the resin material is cured, a lower trim 71 is formed in the lower cavity 51.

  When the resin material in the lower cavity 51 is cooled to below the melting temperature, the slide core 4 is retracted and retracted from the cavity 5 (shown in FIG. 6). Thereafter, the upper die 22 is lowered and brought into contact with the lower die 21, and the protrusion 22b is engaged with the alignment groove 21c (shown in FIG. 7). At this time, since the avoidance core 31 of the core mold 3 is retracted, it does not interfere with the upper mold 22. When the upper die 22 is moved downward, the cavity die 2 and the core die 3 are once clamped in order to reduce sliding resistance with the core die 3 and move without trouble. Is desirable.

  Next, the avoidance core 31 is advanced until the stepped portion 31a abuts on the step portion 3a1 of the avoidance hole 3a, and the upper die 22, the core die 3 and the avoidance core 31 are connected to the lower cavity 51, The upper cavity 52 is formed (shown in FIG. 8). Therefore, the shape of the joint portion between the upper trim 72 and the lower trim 71 is freely formed by the upper mold 22 regardless of the shape of the slide core 4. Thereafter, the resin material is injected by the injection machine 6b and filled into the upper cavity 52 through the resin introduction path 22a. After filling the resin material, the core mold 3 and the cavity mold 2 are kept closed for a predetermined time, and pressure is applied to the resin material. After the resin material is cured, an upper trim 72 coupled to the lower trim 71 is formed in the upper cavity 52, and the door trim 7 is completed (shown in FIG. 9). The door trim 7 opens both the molds 2 and 3 and takes them out of the mold by a normal method. Thereafter, in preparation for the next molding, the avoidance core 31 is retracted, the upper mold 22 is returned to the raised position, and the slide core 4 is advanced.

  According to the present embodiment, the cavity mold 2 is divided so as to sandwich the slide core 4 and the lower mold 21 and the upper mold 22 are provided, and the upper mold 22 can be moved in the vertical direction different from the moving direction of the slide core 4. After forming the lower trim 71 and retracting the slide core 4 from the cavity 5, the upper trim 72 is molded with the lower mold 21 and the upper mold 22 in contact with each other. The shape of the joint portion between the upper trim 72 and the lower trim 71 can be formed, and the shape can be freely changed.

  Further, when the upper mold 22 moves, the avoidance core 31 that can be retracted is provided in the core mold 3 in order to prevent the upper mold 22 from interfering with each other. It can be shaped. Further, in order to maintain the mutual position at the contact portion between the lower die 21 and the upper die 22, the alignment groove 21c and the protrusion 22b are formed, respectively, so that the misalignment between the parts of the molded product is caused. There is little, and the quality can be improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) The lower mold 21 may be movable in the vertical direction with respect to the upper mold 22.
(2) The upper die 22 may be moved in an oblique direction, not necessarily in the vertical direction.
(3) The avoidance core 31 may be provided on the upper mold 22.
(4) The lower mold 21 may be provided with a protrusion 22b, and the upper mold 22 may be formed with a groove 21c.
(5) The positioning portion is not limited to a combination of a ridge and a groove, but can be of any structure as long as it has a structure that prevents both positional deviations such as a protrusion and a hole.
(6) The core mold 3 may be fixed, and the cavity mold 2 may move with respect to the core mold 3.

It is a whole sectional view of a model structure by this embodiment. It is a front view of the door trim shape | molded by the type | mold structure shown in FIG. It is sectional drawing of the door trim shown in FIG. It is a fragmentary sectional view which shows the mold open state before shaping | molding of the type | mold structure shown in FIG. It is sectional drawing which showed the place which shape | molded the lower trim with the type | mold structure shown in FIG. FIG. 6 is a cross-sectional view showing the slide core retracted from the cavity in the mold structure shown in FIG. 5. FIG. 7 is a cross-sectional view showing a state where the upper mold is lowered in the mold structure shown in FIG. 6. FIG. 8 is a cross-sectional view showing the avoidance core advanced in the mold structure shown in FIG. 7. FIG. 5 is a cross-sectional view showing a state where an upper trim is molded with the mold structure shown in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mold structure 2 ... Cavity type | mold 3 ... Core type | mold 4 ... Slide core 5 ... Cavity 7 ... Trim board 21 ... Lower mold | type 21c ... Matching groove 22 ... Upper mold | type 22b ... Projection 31 ... Avoidance core 51 ... Lower cavity 52 ... Upper Cavity 71 ... Lower trim 72 ... Upper trim

Claims (3)

A first mold and a second mold, which are arranged so as to be movable relative to each other and surround a space by both to form a cavity;
It is formed movably in the first mold, and includes a slide core capable of closing the middle by protruding into the cavity,
With the first molding die, the second molding die and the slide core, a part of the molded product is molded in a state of surrounding a part of the cavity, and then the slide core is retracted from the cavity. In the mold structure for composite molding in which the remaining part of the molded product is molded and combined with a part of the molded product,
The first mold is divided so as to sandwich the slide core, and one of the pair of divided molds is movable in a direction different from the moving direction of the slide core, and the slide core is moved to the cavity. A mold structure for composite molding, wherein the remaining part of the molded product is molded in a state where the divided molding dies are brought into contact with each other after being retracted from the mold. When one of the divided molds moves, it can be retracted to the second mold or one of the divided molds to prevent this from interfering with the second mold. The mold structure for composite molding according to claim 1, further comprising an avoidance core. The mold structure for composite molding according to claim 1 or 2, wherein a positioning part for holding each other's position is formed on the contact part of the pair of divided molds. .

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