JP4443296B2 - Dissimilar resin molding equipment - Google Patents

Description

  The present invention relates to a dissimilar resin molding apparatus that combines and molds different types of resins.

When molding an integrated product consisting of two types of resins with different colors, materials, strengths, etc., first mold a primary molded resin part with a primary resin material in a pair of molds, and then the primary molded resin part. With the mold attached to one of the molds, the other mold is automatically replaced with another one and the mold is clamped, and a secondary resin material is injected into the internal molding space to form the primary molding resin. Secondary molded resin parts integrated with the parts are molded. The primary molded resin part and the secondary molded resin part are integrated by thermal welding of the resin components of each other (for example, Patent Document 1).
JP-A-6-106572

  However, in such a conventional technique, since it is necessary to automatically replace one of the molds with another mold, the overall size of the apparatus is increased. In addition, since the primary molded resin part and the secondary molded resin part are bonded only by the heat welding force, for example, when using a resin material containing a large amount of fiber filler, the area of the resin appearing on the surface is reduced accordingly, There is a possibility that the heat welding force of each other is reduced, and the bonding force between the primary molded resin part and the secondary molded resin part is reduced.

  The present invention has been made paying attention to such a conventional technique, and provides only a pair of molds and provides a different type resin molding apparatus capable of increasing the bonding force between different resins.

The invention according to claim 1 includes a primary molding space and a pair of molds capable of forming a secondary molding space expanded from the primary molding space, and press molding or injection of the primary resin material in the primary molding space. The primary molding resin product can be molded by molding, and the primary molding resin can be molded by injection molding of a secondary resin material different from the primary resin material in the secondary molding space in which the primary molding resin parts are set. It is possible to mold a secondary molded resin part that has been heat welded and mechanically fastened to the part, and a slide pin for forming a rivet hole in the primary molded resin part is installed in one of the molds. A rivet forming pin is formed to form a space for forming a secondary resin material that passes through the rivet hole and goes out to the opposite side into a rivet head having a diameter larger than that of the rivet hole. Tree Forming freely der rivets portion engaged with part of the rivet hole is, at the time of molding the secondary molding resin part (19), at least one of the slide pins (4) or rivets forming pin (6) by a predetermined distance projects Te, and wherein Rukoto applying pressure to the secondary resin material for forming the rivet section (21) (18).

The invention described in claim 2 is characterized in that at least one of the primary resin material and the secondary resin material contains a fiber reinforced filler.

  According to the first aspect of the present invention, after molding the primary molded resin part in the primary molding space, the secondary molded resin part can be molded in the expanded secondary molding space using the mold as it is. Therefore, only a pair of molds is required, and there is no need to exchange the molds. Therefore, the entire apparatus can be reduced in size. Also, the mold is provided with a slide pin for forming a rivet hole in the primary molded resin part and a rivet forming pin for forming a rivet head having a diameter larger than that of the rivet hole. A rivet portion for mechanically fastening the secondary molded resin component can be formed, and the bonding force between the two is increased.

Further , since the slide pin or the rivet forming pin is protruded to apply pressure to the secondary resin material forming the rivet part, it is possible to suppress the generation of voids (voids) inside the resin of the rivet part. The strength of the part itself is improved, and a higher mechanical fastening force can be obtained.

According to the invention described in claim 2 , even if at least one of the primary resin material or the secondary resin material contains a fiber reinforced filler, in addition to the original heat welding force, the primary molded resin component and the secondary resin are formed in the rivet portion. Since a mechanical fastening force with the molded resin part is also obtained, the binding force between them can be sufficiently increased.

A primary molding space and a secondary molding space expanded from the primary molding space for the purpose of providing a heterogeneous resin molding device that only requires a pair of molds and can increase the bonding force between different resins. A primary molding resin product can be molded by press molding or injection molding of the primary resin material in the primary molding space, and a primary molding resin part is set inside the secondary molding space. Thus, by performing injection molding of a secondary resin material different from the primary resin material, it is possible to mold the primary molded resin component and the secondary molded resin component that has been thermally welded and mechanically fastened, and either one of the molds. In addition, a slide pin for forming a rivet hole is installed in the primary molded resin part, and a secondary resin material that passes through the rivet hole and goes out to the opposite side is placed on the rivet head having a larger diameter than the rivet hole. Installed rivet forming pin for forming a space for shape, the secondary molding resin component Ri formed freely der rivets portion engaged with the rivet holes of the primary molding resin part, the secondary molded plastic parts (19) during molding, at least one of the slide pins (4) or rivets forming pin (6) protrudes by a predetermined distance, by Rukoto applying pressure to the secondary resin material for forming the rivet section (21) (18), realized did.

  An embodiment of the present invention will be described below with reference to FIGS. The dissimilar resin molding apparatus according to this embodiment includes an upper mold 1 and a lower mold 2 as shown in FIG. The upper mold 1 and the lower mold 2 are aligned with each other, and by moving the upper mold 1 up and down, a small primary molding space S1 and an expanded secondary molding space S2 can be formed.

  The upper mold 1 is provided with a projecting seal block 3 and a slide pin 4. An embossed groove 5 is formed on the bottom surface of the lower mold 2, and a rivet forming pin 6 having a diameter larger than that of the slide pin 4 is installed at a position corresponding to the slide pin 4. Further, slide cores 7 are installed on both sides of the lower mold 2.

  FIG. 2 shows a blank 8 serving as a primary molded resin part set on the lower mold 2. This blank 8 is made of a reinforced resin material (primary resin material) containing a carbon fiber filler, and is cut into a predetermined shape in advance. The blank 8 has a substantially rectangular shape, and has two openings 9 penetrating in the thickness direction and four rivet holes 10. The opening 9 corresponds to the seal block 3, and the rivet hole 10 corresponds to the slide pin 4.

  This blank 8 is heated and softened in advance by a plurality of heaters 12 in a space surrounded by the reflector 11 (FIG. 3). Then, the heat-softened blank 8 is set on the bottom surface of the lower mold 2 (FIG. 4).

  Next, the upper die 1 is lowered, and the seal block 3 and the slide pin 4 are previously inserted into the opening 9 and the rivet hole 10 of the blank 8. Then, the upper mold 1 is further lowered to form a primary molding space S1 with the lower mold 2 (FIG. 5). The primary molding space S1 has a smaller thickness than the blank 8, and is compressed into the primary molding space S1, whereby the blank 8 is stamped press-molded and molded into the primary molded resin component 13 corresponding to the primary molding space S1. Accordingly, the primary molded resin part 13 is formed with an emboss 14 corresponding to the emboss groove 5 and a flange 15 that is pushed upward from both sides.

  Further, when the primary molded resin part 13 is molded, the slide core 7 protrudes from the side by a predetermined dimension with respect to the flange 15 pushed out from the side surface of the lower mold 2. Therefore, as shown in FIGS. 10 and 11, the anchor portion 16 pushed by the slide core 7 is recessed in the middle of the flange 15. Since the slide core 7 pushes in the middle of the flange 15 to form the anchor portion 16, the tip 15a of the flange 15 protrudes by D toward the anchor portion 16, and the anchor portion 16 has an undercut shape. In addition, even if the upper mold | type 1 is lowered | hung in the state which protruded the slide core 7 previously, the substantially the same anchor part 16 can be formed.

  After the anchor portion 16 is formed in the primary molded resin part 13, the upper mold 1 is slightly raised while the primary molded resin part 13 remains in the lower mold 2, and the primary molding space S1 is expanded to the secondary molding space S2. (FIG. 6). After the primary molding resin part 13 is molded in the primary molding space S1, an expanded secondary molding space S2 can be formed by using the mold as it is, so that a mold consisting of a pair of lower mold 2 and upper mold 1 You don't have to change the mold. Therefore, the overall size of the apparatus can be reduced.

  When the upper mold 1 is raised to form the secondary molding space S2, the slide pin 4 is completely stored in the upper mold 1. The seal block 3 maintains the state where the tip is inserted into the opening 9. The rivet forming pin 6 is lowered and a space 17 is formed below the rivet hole 10.

  Next, a secondary resin material 18 containing a short fiber filler is injected into the secondary molding space S2. The injected secondary resin material 18 flows into the anchor portion 16 and also flows into the space 17 formed by the rivet forming pins 6 through the rivet hole 10 (FIG. 7).

  The secondary resin material 18 injected into the secondary molding space S <b> 2 is solidified to become a secondary molded resin part 19. The secondary resin material 18 that has passed through the rivet hole 10 and solidified in the space 17 becomes a rivet portion 21 in which a portion corresponding to the space 17 is a rivet head 20 having a diameter larger than that of the rivet hole 10 (FIG. 12). .

  However, when the rivet portion 21 is solidified, there is a possibility that a void (void) B is generated near the center of the cross section (corresponding to the rivet hole 10) where the cooling and solidification is slow (virtual display in FIG. 13). Therefore, before the rivet portion 21 is solidified, the rivet forming pin 6 and the slide pin 4 are slightly projected to apply pressure to the resin material in the rivet hole 10 (FIGS. 8 and 13). By doing so, generation of void B can be suppressed. Both the rivet forming pin 6 and the slide pin 4 do not necessarily have to protrude, and only one of the rivet forming pin 6 and the slide pin 4 may be used as long as the generation of the void B can be prevented.

  After the secondary molded resin part 19 is solidified in the secondary molding space S2, the upper mold 1 is raised and the mold is opened, and the product 22 in which the primary molded resin part 13 and the secondary molded resin part 19 are bonded to each other is taken out. .

  In the product 22, since the anchor portion 16 is formed on the primary molded resin part 13, the thermal welding area between the primary molded resin part 13 and the secondary molded resin part 19 is expanded, and the thermal welding force between the two is increased. Therefore, even if it is a resin material containing a fiber reinforced filler, the heat welding force between the primary molded resin part 13 and the secondary molded resin part 19 can be increased.

  In addition to the thermal welding, the anchor portion 16 has an undercut shape, so that the end of the secondary molded resin component 19 is mechanically coupled to the head portion 15a of the flange 15 to generate a mechanical fastening force. . Further, since the rivet portion 21 is also formed, the rivet portion 21 generates a mechanical fastening force. Moreover, the rivet portion 21 has a high strength because no void is generated therein, and the mechanical fastening force is sufficiently increased.

  In the above embodiments, the blank 8 made of the primary resin material is stamped press-molded in the primary molding space S1, but the primary resin material may be injection-molded in the primary molding space S1. Further, the secondary molding space S2 may be subjected to not only injection molding but also injection press molding. Furthermore, the mold may have not only a mold opening / clamping structure in the vertical direction as in the embodiment but also a mold opening / clamping structure in the horizontal direction.

  Further, the blank 8 is described as being based on a reinforced resin material (primary resin material) containing a carbon fiber filler, and is described as a secondary resin material 18 containing a short fiber filler, but is not limited to a carbon fiber filler or a short fiber filler, Short fiber glass filler (GF), long fiber glass filler (LGF), random long fiber glass filler (RGF, GMT glass mat thermoplastic), glass fiber fabric (TGF), short fiber carbon fiber (CF), Includes long carbon fiber (LCF), random long carbon fiber (RCF), carbon fiber fabric (TCF), stainless short fiber (SF), stainless long fiber (LSF), aramid fiber, aramid fiber fabric Things can be used. Furthermore, talc, mica (mica), shell powder, plant fibers, etc. may be combined with the above fibers. By combining these, physical property values (bending elastic modulus, tensile breaking strength, Izod impact value, etc.) corresponding to the intended use can be obtained.

Sectional drawing which shows the structure of the metal mold | die concerning one Example of this invention. The top view which shows the blank of the primary molding resin component of FIG. Sectional drawing which shows the heating state of the blank of FIG. Sectional drawing of the metal mold | die which shows the state which set the blank of FIG. 1 to the lower mold | type. Sectional drawing of the metal mold | die which shows the state which lowered | hung the upper mold | type of FIG. 4 and formed the primary shaping | molding space. Sectional drawing of the metal mold | die which shows the state which raised the upper mold | type of FIG. 4 and formed the secondary shaping | molding space. Sectional drawing of the metal mold | die which shows the state which inject | poured the secondary resin material in the secondary molding space of FIG. Sectional drawing of the metal mold | die which shows the state which applied the pressure to the resin material in a rivet hole with the rivet formation pin and slide pin of FIG. Sectional drawing of the metal mold | die which shows the state which opened the mold from FIG. 8 and took out the product. The expanded sectional view which shows the state which made the slide core of FIG. 5 protrude. FIG. 11 is an enlarged cross-sectional view illustrating a state in which an anchor portion is formed by retracting the slide core of FIG. 10. The expanded sectional view which shows the state which the secondary resin material of FIG. 7 flowed in into the space from the rivet hole. The expanded sectional view which shows the state which applied the pressure to the resin material in a rivet hole with the rivet formation pin and slide pin of FIG.

Explanation of symbols

1 Upper mold ( mold )
2 Lower mold ( mold )
4 Slide Pin 6 Rivet Forming Pin 7 Slide Core 10 Rivet Hole 13 Primary Molded Resin Part 16 Anchor Part 18 Secondary Resin Material 19 Secondary Molded Resin Part 20 Rivet Head 21 Rivet Part S1 Primary Molding Space S2 Secondary Molding Space

Claims (2)

A pair of molds (1, 2) capable of forming a primary molding space (S1) and a secondary molding space (S2) expanded from the primary molding space (S1);
In the primary molding space (S1), the primary resin material (13) can be molded by press molding or injection molding the primary resin material,
By performing injection molding of the secondary resin material (18) different from the primary resin material in the secondary molding space (S2) in which the primary molded resin component (13) is set, the primary molded resin component (13). A secondary molded resin part (19) that has been heat-welded and machine-fastened to the mold can be freely molded,
A slide pin (4) for forming a rivet hole (10) in the primary molded resin part (13) is installed on one of the molds (1, 2),
On the other side of the mold (1, 2), a secondary resin material (18) that passes through the rivet hole (10) and exits to the opposite side is formed into a rivet head (20) having a larger diameter than the rivet hole (10). A rivet forming pin (6) forming a space (17) for
Forming freely der rivet portion (21) which engages the rivet hole (10) of the primary molding resin component to the secondary molding resin part (19) (13) is,
At the time of molding the secondary molded resin part (19), at least one of the slide pin (4) or the rivet forming pin (6) protrudes by a predetermined dimension to form the secondary resin material (18) forming the rivet portion (21). heterogeneous resin molding apparatus according to claim Rukoto apply pressure to. The dissimilar resin molding apparatus according to claim 1,
At least one of the primary resin material or the secondary resin material (18) contains a fiber reinforced filler .

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