JP6920947B2 - Molding method for mold equipment and resin molded products - Google Patents

Description

The present invention relates to a mold device for molding a resin molded product in which a ridge portion of the second molded product is exposed from the design surface of the first molded product, and a molding method for the resin molded product.

For example, for the purpose of improving the design of vehicle interior members used in automobiles and the like, resin molded products that reproduce stitch patterns such as thread seams have been proposed.

As shown in FIG. 24, the resin molded product having a stitch pattern has a first molded body 112 that constitutes a main part of the design surface and a protrusion that is exposed from the design surface of the first molded body 112 to form a stitch pattern. It is composed of a second molded body 110 provided with a strip 110a (see Patent Document 1). Further, in this type of resin molded product, first, either one of the first molded product and the second molded product is molded first by filling the mold with a resin material, and then the molded product is made of gold. It is generally molded by a so-called two-color molding method in which another resin material is filled while remaining in the mold and the other is molded.

Japanese Unexamined Patent Publication No. 2012-139966

In two-color molding of a resin molded product having a stitch pattern as described above, for example, if a mold device as shown in FIG. 25 is used, it is possible to perform two-color molding with the same mold without changing the mold. Is. Specifically, this mold apparatus includes an upper mold 200 for molding the design surface side of the resin molded product and a lower mold 300 for molding the back surface side of the resin molded product, and the upper mold 200 is first molded. A design molding surface 200a for molding the design surface of the body and a recess 200b for molding the stitch pattern (protruding portion) of the second molded body are formed. On the other hand, the lower mold 300 is formed with a convex portion 300a for sealing the concave portion 200b of the upper mold 200.

In order to mold a resin molded product using this mold device, first, as shown in FIG. 25 (A), a first mold for molding a first molded product between the upper mold 200 and the lower mold 300. One cavity 400 is defined. Then, as shown in FIG. 25 (B), the first resin material 500 is filled in the first cavity 400 to form the first molded product. At this time, since the concave portion 200b of the upper mold 200 is sealed by the convex portion 300a of the lower mold 300, the intrusion of the first resin material 500 into the concave portion 200b is prevented. After that, as shown in FIG. 25C, by separating the lower mold 300 from the upper mold 200, the recess 200b is opened and the second cavity 600 for molding the second molded body is defined. do. Then, as shown in FIG. 25 (D), the second resin material 700 is filled in the second cavity 600 to form a second molded body having a ridge portion. After that, by releasing the mold, a resin molded product in which the first molded body and the second molded body are integrated can be obtained.

By the way, in the mold apparatus shown in FIG. 25, in order to seal the concave portion 200b, the convex portion 300a is brought into contact with the entire inner surface of the concave portion 200b. On the other hand, the configuration in which the convex portion 300a is brought into contact with the seal is required to have high accuracy in terms of the dimensions and positioning of the concave portion 200b and the convex portion 300a. That is, if a slight dimensional error or misalignment occurs in the concave portion 200b or the convex portion 300a, a gap is generated between the concave portion 200b and the convex portion 300a. There is a possibility of entering the recess 200b. As described above, in the mold apparatus shown in FIG. 25, it was difficult to reliably seal the recess 200b.

Therefore, an object of the present invention is to ensure that the molds are in close contact with each other and that material leakage can be reliably prevented without manufacturing or positioning the molds with high accuracy.

In order to solve the above problems, the present invention is for molding a resin molded article having a first molded article and a second molded article provided with a ridge portion exposed from the design surface of the first molded article. In the mold device, the first molded body is molded between the first molding die that molds the design surface side of the resin molded product and the back surface side of the resin molded product and the first molding die. A second molding die for defining a first cavity for molding and a second cavity for molding the second molded body is provided, and the first molding die has a recess for molding the ridge portion. has the second mold, wherein when defining a first cavity, the inclined surfaces inclined from the bottom of the recess without contacting the bottom of at least the concave portion so as to spread toward the opening edge or the Provided is a mold device having a sealing portion for sealing the recess so as not to communicate with the first cavity by contacting the outer peripheral portion of the opening edge of the recess.

In this way, the sealing portion comes into contact with at least an inclined surface that is inclined so as to spread from the bottom of the recess toward the opening edge or the outer peripheral portion of the opening edge of the recess without contacting the bottom of the recess. Compared with the configuration in which the convex portion is brought into contact with the entire inner surface of the concave portion as in the example shown in 25, the concave portion can be reliably sealed without manufacturing or positioning the mold with high accuracy.

Further, in order to solve the above problems, the present invention molds a resin molded product having a first molded product and a second molded product provided with a ridge portion exposed from the design surface of the first molded product. In the molding method, a first molding die provided with a recess for molding the design surface side of the resin molded product and the ridge portion, and a second molding die for molding the back surface side of the resin molded product. Of an inclined surface or an opening edge of the recess that is relatively close to each other and is inclined so that the second molding die spreads from the bottom of the recess toward the opening edge without contacting at least the bottom of the recess. A step of sealing the concave portion by contacting the outer peripheral portion to define a first cavity that does not communicate with the concave portion, and a step of filling the first cavity with a first resin material to form the first molded product. The step of molding and the first molding die and the second molding die are relatively separated from each other while leaving the first molded body in the first cavity, and the recess is opened to communicate with the recess. Provided is a method for molding a resin molded product, which comprises a step of defining a second cavity to be molded and a step of filling the second cavity with a second resin material to form the second molded product.

In this way, by contacting the second molding die with an inclined surface inclined so as to spread from the bottom of the recess toward the opening edge or the outer peripheral portion of the opening edge of the recess without contacting at least the bottom, FIG. 25 shows. Compared with the configuration in which the convex portion is brought into contact with the entire inner surface of the concave portion as in the example shown, the concave portion can be reliably sealed without manufacturing or positioning the mold with high accuracy.

According to the present invention, even if the molds are not manufactured or positioned with high accuracy, the molds can be surely brought into close contact with each other to prevent the resin material from leaking. Shape accuracy and design can be ensured, and quality is improved. In addition, it becomes easy to manage the dimensions and positioning of the mold.

It is a perspective view of the panel which concerns on one Embodiment of this invention. It is a figure which shows the cross-sectional shape of each part of the panel shown in FIG. 1, (A) is the cross-sectional view of AA of FIG. FIG. 1 is a cross-sectional view of a mold device for molding a panel shown in FIG. 1, in which (A) is a cross-sectional view of a portion corresponding to FIG. 2 (A), and (B) is a portion corresponding to FIG. 2 (B). It is a cross-sectional view of. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a perspective view of the panel which concerns on other embodiment of this invention. 8 is a view showing a cross-sectional shape of each part of the panel shown in FIG. 8, where FIG. 8A is a cross-sectional view taken along the line AA of FIG. It is sectional drawing of the mold apparatus for molding a panel shown in FIG. 8, (A) is the sectional view of the part corresponding to FIG. 9 (A), (B) corresponds to FIG. 9 (B). It is sectional drawing of the part. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for comparing the apparent width of the peripheral edge portion, (A) is the sectional view of the panel shown in FIG. 8, and (B) is the sectional view of the panel shown in FIG. It is a figure which shows an example of the arrangement with respect to the line of sight of the panel shown in FIG. It is a perspective view of the panel which concerns on still another Embodiment of this invention. It is a figure which shows the cross-sectional shape of each part of the panel shown in FIG. 17, (A) is the AA cross-sectional view of FIG. 17, and (B) is the BB cross-sectional view of FIG. It is sectional drawing of the mold apparatus for molding a panel shown in FIG. 17, (A) is the sectional view of the part corresponding to FIG. 18 (A), (B) corresponds to FIG. 18 (B). It is sectional drawing of the part. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure for demonstrating the molding method of the panel shown in FIG. It is a figure which shows an example of the resin molded article which formed the stitch pattern. (A) to (D) are cross-sectional views of the mold apparatus according to the comparative example.

Hereinafter, the molding method of the mold device and the resin molded product according to the embodiment of the present invention will be described by taking as an example the case of molding an instrument panel installed in the front part of the vehicle interior of an automobile or the like. However, the mold apparatus and molding method according to the present invention are not limited to the case of molding an instrument panel. For example, the present invention can be applied to other vehicle interior members such as door trims and console boxes, as well as resin molded products used other than vehicles.

FIG. 1 is a perspective view of an instrument panel (hereinafter, simply referred to as “panel”) according to the present embodiment, FIG. 2 is a view showing a cross-sectional shape of each part of the panel shown in FIG. A cross-sectional view taken along the line 1A and FIG. 1B is a cross-sectional view taken along the line BB of FIG.

As shown in FIGS. 1 and 2, the panel 1 is composed of a first molded body 2 and a second molded body 3 molded of resin materials of different colors. In FIG. 1, the front side of the panel 1 is the design surface. A part of the second molded body 3 is arranged so as to be laminated on the back surface side opposite to the design surface of the first molded body 2. A plurality of ridges 3a are intermittently provided in the portion of the second molded body 3 arranged on the back surface side, and these ridges 3a are exposed from the design surface of the first molded body 2. As a result, a stitch pattern as if sewn with a thread is formed on the design surface of the first molded body 2. In the present embodiment, the plurality of ridge portions 3a are arranged along the groove portions 2a formed on the design surface of the first molded body 2. Further, around each ridge portion 3a, an annular peripheral edge portion 3b is formed in which a part of the flat surface of the second molded body 3 is exposed from the design surface of the first molded body 2.

FIG. 3 is a cross-sectional view of a mold device for molding a panel according to the present embodiment.
Each cross section of the mold apparatus shown in FIGS. 3A and 3B corresponds to each cross section of the panel shown in FIGS. 2A and 2B.

As shown in FIG. 3, the mold apparatus 4 includes an upper mold 5 as a first molding mold for molding the design surface side of the panel and a lower mold 6 as a second molding mold for molding the back surface side of the panel. Be prepared.

The upper mold 5 has a first unique design molding surface 5a for molding the design surface of the first molded body 2, a second design molding surface 5b for molding the design surface of the second molded body 3, and a protrusion of the second molded body 3. It has a recess 5c for forming a strip 3a. The inner surface of the recess 5c is inclined so as to extend from the bottom 5c1 toward the opening edge 5c2.

Further, the upper mold 5 has a first convex surface portion 5d {see FIG. 3 (A)} for forming the groove portion 2a of the first molded body 2, and a second projecting downward from the first convex surface portion 5d. A convex surface portion 5e {see FIG. 3 (B)} is provided (t1 <t2). The second convex surface portion 5e is a portion corresponding to the annular peripheral edge portion 3b of the second molded body 3, and is provided over the entire circumference of the concave portion 5c. Further, a third convex surface portion 5f having the same height (protrusion amount) as the second convex surface portion 5e is provided between the first unique design molding surface 5a and the second design molding surface 5b of the upper mold 5. t2 = t3).

The lower mold 6 has a main mold 7 and a slide mold 8 slidably provided with respect to the main mold 7. The slide mold 8 is configured to approach and separate from the upper mold 8 by sliding and moving in the vertical direction. Further, the upper surface 8a of the slide type 8 is a flat surface substantially orthogonal to the slide direction.

As shown by the alternate long and short dash line in FIG. 3, when the slide mold 8 is raised and approaches the upper mold 5, the upper surface 8a of the slide mold 8 is on the second convex surface portion 5e and the third convex surface portion 5f of the upper mold 5. Contact. On the other hand, the upper surface 8a of the slide mold 8 is arranged so as to face the first convex surface portion 5d of the upper mold 5 through a gap without contacting the first convex surface portion 5d.

In this way, when the slide mold 8 is raised and the upper surface 8a of the slide mold 8 is in contact with the second convex surface portion 5e, the upper surface 8a of the slide mold 8 is the outer peripheral portion (entire circumference) of the opening edge 5c2 of the recess 5c. The recess 5c is sealed by being in contact with the. That is, of the upper surface 8a of the slide type 8, the portion 8b facing the second convex surface portion 5e functions as a sealing portion 9 that seals the concave portion 5c by contact with the second convex surface portion 5e.

Further, in a state where the slide mold 8 is raised and the upper surface 8a of the slide mold 8 is in contact with the third convex surface portion 5f, the contact between the upper surface 8a of the slide mold 8 and the third convex surface portion 5f causes the third unique craft molding surface 5a. The area on the side and the area on the side of the second design molding surface 5b are partitioned. That is, of the upper surface 8a of the slide mold 8, the portion 8c facing the third convex surface portion 5f is located on the region on the third unique design molding surface 5a side and the second design molding surface 5b side due to contact with the third convex surface portion 5f. It functions as a partition portion 10 that partitions the area.

Subsequently, a method of molding a panel using the mold apparatus of the present embodiment will be described with reference to FIGS. 4 to 7.

First, as shown in FIG. 4, the upper mold 5 and the lower mold 6 are molded, and the upper mold 5 and the lower mold 6 are brought into contact with each other. Further, in this state, the slide mold 8 is arranged at a position close to the upper mold 5, so that the upper surface 8a (sealing portion 9 and the partition portion 10) of the slide mold 8 becomes the second convex surface of the upper mold 5. It comes into contact with the portion 5e and the third convex surface portion 5f. As a result, the recess 5c is sealed, and the region on the side of the first unique design molding surface 5a and the region on the side of the second design molding surface 5b are separated. As a result, a first cavity (region on the third unique design molding surface 5a side) 11 that does not communicate with the recess 5c and the region on the second design molding surface 5b side is defined between the upper mold 5 and the lower mold 6. NS.

Then, as shown in FIG. 5, the first cavity 11 is filled with the first resin material softened by heating while applying pressure by an injection molding machine. At this time, since the recess 5c is sealed and the first cavity 11 is separated from the other region, the intrusion or leakage of the first resin material into the recess 5c and the other region is prevented. After that, the first resin material is cooled and cured to form the first molded body 2.

Next, as shown in FIG. 6, the slide mold 8 is lowered while the first molded body 2 is left in the first cavity 11, and the slide mold 8 is separated from the upper mold 5. As a result, the contact between the upper surface 8a (sealing portion 9) of the slide mold 8 and the second convex surface portion 5e of the upper mold 5 is released, and the concave portion 5c is opened. At the same time, the contact between the upper surface 8a (partition portion 10) of the slide mold 8 and the third convex surface portion 5f of the upper mold 5 is also released. As a result, between the upper mold 5 and the lower mold 6, the region generated by lowering the slide mold 8, the region on the second design forming surface 5b side, and the recess 5c communicate with each other in the second cavity. 12 is defined.

Then, as shown in FIG. 7, the second cavity 12 is filled with the second resin material softened by heating while applying pressure by an injection molding machine. After that, the second resin material is cooled and cured to form the second molded body 3 having the ridge portion 3a. Then, by opening the upper mold 5 and the lower mold 6 and releasing the resin molded product, a panel in which the first molded body 2 and the second molded body 3 are integrated can be obtained.

As described above, in the present embodiment, when the first cavity is defined, the upper surface 8a (sealing portion 9) of the slide mold 8 is brought into contact with the second convex surface portion 5e of the upper mold 5, so that the concave portion 5c is formed. {See FIG. 4 (B)}. As described above, in the present embodiment, when sealing the concave portion, the slide mold (second molding mold) is used instead of adopting the configuration in which the convex portion is brought into contact with the entire inner surface of the concave portion as in the example shown in FIG. By adopting a configuration in which the outer peripheral portion of the opening edge of the concave portion is brought into contact with the inner surface of the concave portion, the mold can be manufactured and positioned with higher accuracy than the example shown in FIG. Even if it is not done, the recess can be securely sealed. As a result, the shape accuracy and design of the resin molded product can be ensured, and the quality is improved. Further, the dimensional control and the positioning control of the mold are facilitated, and since it is not necessary to provide the convex portion for sealing the concave portion in the mold, the shape of the mold can be simplified.

In particular, in the present embodiment, the contact surfaces of the molds (second convex surface portion 5e and sealing portion 9) that come into contact with each other to seal the concave portion are flat surfaces that are substantially orthogonal to the slide direction of the slide mold. Even if some dimensional error or misalignment of the contact surfaces occurs in the lateral direction (direction intersecting with the slide type slide direction), it is not easily affected by the contact surfaces, and the contact surfaces adhere to each other. Can be secured. Therefore, the certainty of the recess sealing is improved.

In the example shown in FIG. 25, since the lower mold is provided with a convex portion for sealing the concave portion of the upper mold, the resin molded product obtained by this mold has a portion on the back side of the ridge portion. Traces (dents) of the convex part of the lower mold are formed in. On the other hand, in the present embodiment, since the upper surface 8a of the slide mold 8 is formed on a uniform flat surface without steps or irregularities (see FIG. 3), the back side of the ridge portion 3a of the second molded body 3 Is molded into a uniform flat surface with no steps or irregularities.

Subsequently, an embodiment of the present invention different from the above embodiment will be described focusing on different parts. In the embodiments described below, members having basically the same functions or shapes as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 8 is a perspective view of a panel according to another embodiment of the present invention. Further, FIG. 9 shows the cross-sectional shape of each part of the panel shown in FIG. 9A is a cross-sectional view taken along the line AA of FIG. 8, and FIG. 9B is a cross-sectional view taken along the line BB of FIG.

As shown in FIGS. 8 and 9, the panel 1 according to the present embodiment has the first molded body 2 and the second molded body 3 and is provided on the second molded body 3 as in the above embodiment. The plurality of ridges 3a are exposed from the design surface of the first molded body 2. In the present embodiment, a particular difference from the above embodiment is an annular peripheral edge portion 3b exposed around each ridge portion 3a. Specifically, in the present embodiment, the peripheral edge portion 3b is an inclined surface (tapered surface) that is inclined so as to approach each other in a direction opposite to the protruding direction of the ridge portion 3a (downward in FIG. 9). ing. On the other hand, in the above embodiment, the peripheral edge portion 3b is formed of a flat surface substantially orthogonal to the protruding direction of the ridge portion 3a (see FIG. 2).

As described above, since the shape of the panel in this embodiment is different from that in the above embodiment, the shape of the mold for molding the panel is also different from that in the above embodiment.

FIG. 10 shows a cross-sectional shape of a mold device for molding a panel according to the present embodiment.
Each cross section of the mold apparatus shown in FIGS. 10A and 10B corresponds to each cross section of the panel shown in FIGS. 9A and 9B.

The mold device 4 shown in FIG. 10 differs from the mold device according to the above embodiment in that a concave portion 8d is provided on the upper surface 8a of the slide mold 8. The concave portion 8d is arranged at a position facing the concave portion 5c and the second convex surface portion 5e of the upper die 5, and has an inclined surface (tapered surface) 8e that is inclined so as to approach each other downward at the edge portion thereof. It is provided.

As shown by the alternate long and short dash line in FIG. 10B, when the slide mold 8 is raised and the slide mold 8 is close to the upper mold 5, the inclined surface 8e of the concave portion 8d provided on the slide mold 8 is formed. It comes into contact with the inclined surface around the top of the second convex surface portion 5e provided on the upper die 5 over the entire circumference. In this state, the recess 5c is sealed. As described above, in the present embodiment, the inclined surface 8e of the concave portion 8d functions as a sealing portion 9 that seals the concave portion 5c by contact with the second convex surface portion 5e.

Subsequently, a method of molding the panel using the mold apparatus shown in FIG. 10 will be described with reference to FIGS. 11 to 14.

First, as shown in FIG. 11, the upper mold 5 and the lower mold 6 are molded, and the slide mold 8 is arranged at a position close to the upper mold 5. At this time, the concave portion 5c is sealed by the inclined surface 8e (sealing portion 9) of the slide mold 8 coming into contact with the second convex surface portion 5e of the upper mold 5. Further, when the flat surface (partition portion 10) of the slide mold 8 comes into contact with the third convex surface portion 5f, the region on the first unique design molding surface 5a side and the region on the second design molding surface 5b side are partitioned. .. As a result, a first cavity 11 that does not communicate with the recess 5c and the region on the second design molding surface 5b side is defined between the upper mold 5 and the lower mold 6.

Then, as shown in FIG. 12, the first cavity 11 is filled with the first resin material to form the first molded body 2.

Next, as shown in FIG. 13, the slide mold 8 is lowered while the first molded body 2 is left in the first cavity 11, and the slide mold 8 is separated from the upper mold 5. As a result, the contact between the inclined surface 8e (sealing portion 9) of the slide mold 8 and the second convex surface portion 5e of the upper mold 5 is released, and the concave portion 5c is opened. At the same time, the contact between the flat surface (partition portion 10) of the slide mold 8 and the third convex surface portion 5f of the upper mold 5 is also released. As a result, between the upper mold 5 and the lower mold 6, the region generated by lowering the slide mold 8, the region on the second design forming surface 5b side, and the recess 5c communicate with each other in the second cavity. 12 is defined.

Then, as shown in FIG. 14, the second cavity 12 is filled with the second resin material. After that, the filled second resin material is cured to form a panel in which the first molded body 2 and the second molded body 3 are integrated.

Since the mold device according to the present embodiment is provided with the concave portion 8d on the upper surface of the slide mold 8, the panel formed by the mold device is different from the above embodiment in that the slide mold 8 is provided. On the portion of the panel corresponding to the concave portion 8d of the above, that is, on the back side of the ridge portion 3a of the second molded body 3, a protrusion 3c that protrudes as compared with the other portions is formed {see FIG. 9 (B)}.

As described above, in the present embodiment, when the first cavity is defined, the concave portion 5c can be sealed by bringing the inclined surface 8e of the slide type 8 into contact with the inclined surface of the second convex surface portion 5e. Yes {see FIG. 11 (B)}. In this case as well, as in the above embodiment, the slide mold is not brought into contact with the inner surface of the recess, but is brought into contact with the outer peripheral portion of the opening edge of the recess so as to cover the entire inner surface of the recess as in the example shown in FIG. Compared with the configuration in which the convex portions are brought into contact with each other, the concave portions can be reliably sealed without manufacturing or positioning the mold with high accuracy. As a result, the shape accuracy and design of the resin molded product can be ensured, the quality is improved, and the dimensional control and positioning control of the mold become easy.

By the way, the larger the contact width between the molds for sealing the concave portion (the width of the sealing portion 9) is secured, the larger the sealing effect can be obtained, so that the first resin material can surely invade the concave portion. It is possible to prevent it. However, on the other hand, if the contact width between the dies is increased, the width of the peripheral portion formed is also increased accordingly, so that the outline of the ridge portion constituting the stitch pattern is blurred, and from the viewpoint of designability. There are circumstances such as unfavorable.

In this regard, in the panel according to the present embodiment, since the peripheral edge portion is formed of an inclined surface, the peripheral edge portion becomes inconspicuous, and the design of the stitch pattern can be improved. That is, as shown in FIG. 15, since the peripheral edge portion 3b according to the present embodiment is composed of an inclined surface {see FIG. 15 (A)}, as compared with the flat surface-shaped peripheral edge portion 3b as in the above embodiment. {Refer to FIG. 15 (B)}, while ensuring the same contact width (actual width of the peripheral portion 3b) W1 between the molds for sealing the concave portion, the apparent width W2 of the peripheral portion 3b is obtained. It can be made smaller.

Further, as shown in FIG. 16, by arranging the panels according to the present embodiment so that the line of sight is in the direction of the arrow in the figure, the width of the upper portion 3b1 of the peripheral edge portion looks even narrower, and the peripheral edge thereof is seen. Since the lower portion 3b2 of the portion is hidden by the ridge portion 3a, the peripheral portion can be made more inconspicuous. As described above, in the panel according to the present embodiment, the peripheral edge portion can be made inconspicuous, and the outline of the ridge portion constituting the stitch pattern can be made clear, so that the design is improved.

FIG. 17 is a perspective view of a panel according to still another embodiment of the present invention. Further, FIG. 18 shows the cross-sectional shape of each part of the panel shown in FIG. 18A is a cross-sectional view taken along the line AA of FIG. 17, and FIG. 18B is a cross-sectional view taken along the line BB of FIG.

As shown in FIGS. 17 and 18, the panel 1 according to the present embodiment differs from each of the above embodiments in that the peripheral portion 3b as described above is not provided around each ridge portion 3a. be. That is, in the present embodiment, the outer peripheral surface of the ridge portion 3a and the design surface of the first molded body 2 are adjacent to each other. Therefore, the panel according to the present embodiment has a clearer outline of the ridge portion and is excellent in design as compared with the panel according to each of the above embodiments.

FIG. 19 shows a cross-sectional shape of a mold device for molding a panel according to the present embodiment.
Each cross section of the mold apparatus shown in FIGS. 19A and 19B corresponds to each cross section of the panel shown in FIGS. 18A and 18B.

One of the differences between the mold apparatus 4 shown in FIG. 19 and the mold apparatus according to each of the above embodiments is that a convex portion 8f is provided on the upper surface 8a of the slide mold 8 {FIG. 19 (FIG. 19). B) See}. The convex portion 8f is arranged at a position facing the concave portion 5c of the upper die 5, and has an inclined surface (tapered surface) 8g that is inclined so as to approach each other upward. Further, in the present embodiment, unlike each of the above-described embodiments, the second convex surface portion 5e protruding downward from the first convex surface portion 5d is not provided, and the concave portion 5c (not the second convex surface portion 5e) is provided. It is provided on the first convex surface portion 5d.

As shown by the alternate long and short dash line in FIG. 19B, when the slide mold 8 is raised and the slide mold 8 is close to the upper mold 5, the inclined surface 8g of the convex portion 8f provided on the slide mold 8 is formed. It contacts the inner peripheral portion (inclined surface) of the opening edge 5c2 of the recess 5c provided in the upper mold 5 over the entire circumference. In this state, the recess 5c is sealed. As described above, in the present embodiment, the inclined surface 8g of the convex portion 8f functions as a sealing portion 9 that seals the concave portion 5c by contact with the concave portion 5c.

Subsequently, a method of molding the panel using the mold apparatus shown in FIG. 19 will be described with reference to FIGS. 20 to 23.

First, as shown in FIG. 20, the upper mold 5 and the lower mold 6 are molded, and the slide mold 8 is arranged at a position close to the upper mold 5. At this time, the convex portion 8f of the slide mold 8 is inserted into the concave portion 5c of the upper mold 5, and the inclined surface 8g (sealing portion 9) of the convex portion 8f comes into contact with the inner peripheral portion of the opening edge of the concave portion 5c. As a result, the recess 5c is sealed. Further, at this time, the flat surface (partition portion 10) of the slide mold 8 comes into contact with the third convex surface portion 5f, so that the region on the first unique design molding surface 5a side and the region on the second design molding surface 5b side are formed. Is partitioned. As a result, a first cavity 11 that does not communicate with the recess 5c and the region on the second design molding surface 5b side is defined between the upper mold 5 and the lower mold 6.

Then, as shown in FIG. 21, the first cavity 11 is filled with the first resin material to form the first molded body 2.

Next, as shown in FIG. 22, the slide mold 8 is lowered while the first molded body 2 is left in the first cavity 11, and the slide mold 8 is separated from the upper mold 5. As a result, the contact between the inclined surface 8g (sealing portion 9) of the slide mold 8 and the recess 5c of the upper mold 5 is released, and the recess 5c is opened. At the same time, the contact between the flat surface (partition portion 10) of the slide mold 8 and the third convex surface portion 5f of the upper mold 5 is also released. As a result, between the upper mold 5 and the lower mold 6, the region generated by lowering the slide mold 8, the region on the second design forming surface 5b side, and the recess 5c communicate with each other in the second cavity. 12 is defined.

Then, as shown in FIG. 23, the second cavity 12 is filled with the second resin material. After that, the filled second resin material is cured to form a panel in which the first molded body 2 and the second molded body 3 are integrated.

Since the mold device according to the present embodiment is provided with the convex portion 8f on the upper surface of the slide mold 8, the panel formed by the mold device is different from the above embodiment in that the slide mold 8 is formed. The recessed portion 3d is formed on the portion of the panel corresponding to the convex portion 8f of the above, that is, on the back side of the ridge portion 3a of the second molded body 3 {see FIG. 18 (B)}.

As described above, in the present embodiment, when the first cavity is defined, the convex portion 8f of the slide mold 8 is inserted into the concave portion 5c of the upper mold 5, and the inclined surface 8g (sealing portion) of the convex portion 8f is inserted. The recess 5c is sealed by bringing 9) into contact with the inner peripheral portion of the opening edge of the recess 5c {see FIG. 20 (B)}. However, unlike the example shown in FIG. 25, the convex portion is not brought into contact with the entire inner surface of the concave portion. That is, in the present embodiment, the slide-type convex portion is not brought into contact with the entire inner surface of the concave portion (at least not with the bottom portion of the concave portion), but is brought into contact with only the inner peripheral portion of the opening edge of the concave portion. As a result, as compared with the example shown in FIG. 25, the concave portion can be reliably sealed without manufacturing or positioning the mold with high accuracy.

Although each embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

In the description of each of the above-described embodiments, as a mold for molding the resin molded product, the first molding mold for molding the design surface side of the resin molded product is the upper mold, and the second molding mold for molding the back surface side of the resin molded product is formed. Although the case where the molding die is the lower die is taken as an example, the first molding die and the second molding die may be arranged upside down or left and right.

Further, the resin molded product molded by the mold apparatus or the molding method according to the present invention is not limited to the one made of resin materials having different colors. The present invention can also be applied to resin molded products molded from different types of resin materials such as texture and hardness in addition to color.

1 Instrument panel 2 1st molded body 3 2nd molded body 3a Protruding part 4 Mold device 5 Upper mold (1st molding mold)
5c recess 5c1 bottom 5c2 opening edge 6 lower mold (second molding mold)
7 Main type 8 Slide type 9 Sealing part 11 1st cavity 12 2nd cavity

Claims (2)

A mold device for molding a resin molded product having a first molded product and a second molded product provided with a ridge portion exposed from the design surface of the first molded product.
A first cavity for molding the first molded body between the first molding die for molding the design surface side of the resin molded product and the back surface side of the resin molded product and the first molding die. And a second molding mold for defining the second cavity for molding the second molded body.
The first molding die has a recess for molding the ridge portion.
When the first cavity is defined, the second molding die has an inclined surface or an opening of the recess that is inclined so as to spread from the bottom of the recess toward the opening edge without contacting at least the bottom of the recess. A mold device comprising a sealing portion that seals the recess so as not to communicate with the first cavity by contacting the outer peripheral portion of the edge. A molding method for molding a resin molded product having a first molded product and a second molded product provided with a ridge portion exposed from the design surface of the first molded product.
The first molding die provided with a recess for molding the design surface side of the resin molded product and the ridge portion, and the second molding die for molding the back surface side of the resin molded product are relatively different from each other. Bring the second molding to contact with an inclined surface that is inclined so as to spread from the bottom of the recess toward the opening edge or the outer peripheral portion of the opening edge of the recess without contacting at least the bottom of the recess. Thereby, a step of sealing the recess and defining a first cavity that does not communicate with the recess,
A step of filling the first cavity with a first resin material to form the first molded product, and
While leaving the first molded body in the first cavity, the first molding die and the second molding die are relatively separated from each other, and the recess is opened to form a second cavity that communicates with the recess. The process of defining and
A method for molding a resin molded product, which comprises a step of filling the second cavity with a second resin material and molding the second molded product.

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