JP4817429B2 - Molding method for multicolor molded products - Google Patents

Description

This invention is a door trim, a luggage trim, trunk trim and the like, relates to a molding method of the preferred multicolor molded article for automobile interior parts, particularly speaker grill, between the grill unit and other general portions such as Eaguriru a method of molding a multicolor molding article obtained by different colors, it is possible to simplify the mold equipment, can shorten the number of steps, as a result, to a molding method of a multicolor molded article can lead to substantial cost reductions .

  Various interior parts such as door trims, luggage trims, trunk trims, etc. are usually installed in the interior of automobiles, luggage rooms, and trunk rooms. Recently, multi-color molding with different colors to enhance the appearance performance. Goods tend to be used frequently. For example, as shown in FIG. 15, the door trim 1 based on a multi-color molded product is composed of an upper and lower divided body of a door trim upper 2 and a door trim lower 3. The speaker grille 4 formed by a mold is assembled. A conventional example in which the speaker grill 4 is assembled to the door trim lower 3 is described in detail in Patent Document 1.

JP 2001-347836 A

  As described above, conventionally, when the door trim lower 3 and the speaker grill 4 are made different in color, the door trim lower 3 and the speaker grill 4 are formed by separate molding dies and then assembled together. Therefore, each of them requires a dedicated molding die, which increases the cost of mold equipment and assembles both after molding, which increases the number of processes, which is a major factor leading to an increase in cost. .

The present invention has been made in view of such circumstances, and in particular, multicolor molded products in which colors of the general portion and the grill portion are different from each other can be molded at low cost with simple equipment. and to provide a molding method of a molded article.

In order to solve the above-described problems, a first aspect of the present invention is a molding method for a multicolor molded product in which a trim body and a grill portion having different colors are integrally molded in the same molding die. A trim body molding process that molds the trim body by injecting and filling molten resin from an injection machine into a general cavity defined by clamping the mold, and punching on the upper and lower sides arranged in the molding upper and lower molds. by moving the child to form a grille cavity, and injecting and filling the molten resin from the other side of the injection machine to the grill unit cavity consists of a molding process of the grill portion for molding the grill unit, the molding under A dummy part insert corresponding to the dummy part of the grill part is arranged on the outer periphery of the punching insert arranged in the mold, and the dummy part insert descends by driving the cylinder when the lower punching insert is raised. And Grille cavity between the punching die insert is characterized in that it is formed thick and over portions nested in the upper mold.
According to a second aspect of the present invention, there is provided a multicolor molded product molding method in which a trim main body and a grill portion having different colors are integrally molded in the same molding die. The molding process of the trim body that molds the trim body by injecting and filling molten resin from the injection machine into the general cavity to be defined, and the upper and lower punching inserts arranged in the molding upper and lower molds are moved, A grill part cavity is formed, and the grill part is formed by injecting and filling molten resin from the other side of the injection machine into the grill part cavity and molding the grill part, and is disposed in the molding upper die. An outer peripheral rib projecting downward is formed along the outer periphery of the punching insert, and a sealing property is achieved by a shear structure between the outer peripheral rib and a portion corresponding to the dummy portion of the grill portion in the lower mold. A support flange that supports the grill portion along the outer periphery of the grill portion by the outer peripheral rib of the punching insert and the shear structure of this portion when the punching insert in the upper mold rises due to the rise of the lower punching insert Is formed.

  Here, the multi-color molded product is a resin part in which a grill portion such as a speaker grill or an air grill is integrated, and a multi-color molded product having a different color between the trim body and the grill portion, which is a general part. Applicable. For example, a rear parcel shelf with a speaker grill is a typical example, and the grill may be an air grill in addition to the speaker grill, and the trim may be a door trim, rear parcel shelf, luggage trim, trunk trim, etc. It is done. Moreover, as resin to be used, the general thermoplastic resin represented by polypropylene resin, ABS resin, polyethylene resin etc. can be used, and various fillers may be mixed with thermoplastic resin. Next, the molding die consists of a molding upper and lower mold that can be mutually opened and clamped. The molding upper mold has a cavity surface shape, and can be moved up and down by a predetermined stroke by a lifting cylinder. The lower mold is provided with a hot runner and a gate that are resin passages of molten resin supplied from a continuous injection machine, and the molten resin is injected and filled into a cavity defined by the upper and lower molds.

  Further, the molded upper and lower molds are provided with punching inserts corresponding to the grill portions, and the upper and lower punching inserts can be moved up and down by gas springs or hydraulic cylinders, respectively. For example, when the upper mold of the molding is lowered and the upper and lower molds are clamped, the general cavity that becomes the cavity of the trim body is defined. At this time, molten resin flows from the general cavity into the grill cavity. To prevent this, the outer periphery of the grille cavity has a seal structure. That is, the space between the mold surface of the lower mold and the punching insert in the upper mold is sealed. After the molten resin is injected and filled into the general cavity and the trim body is molded into the required shape along the general cavity shape, the lower punching insert is raised by driving the cylinder, so that the upper The punching insert also rises to form a grill part cavity, and a molten resin having a color different from that of the above-described molten resin is injected and filled into the grill part cavity to form the grill part.

  Therefore, according to the present invention, after the upper and lower molds are clamped, the molten resin is injected and filled into the general cavity, the trim body is molded, and then the punching insert is moved to newly form the grill cavity. In addition, by injecting and filling a molten resin having a color different from that of the molten resin that is the material of the trim body into the grill portion cavity, the trim body and the grill portion having different colors can be integrally formed. Therefore, since the trim body and the grill can be molded integrally using the same molding die, the mold equipment can be simplified and the process of assembling both can be eliminated, greatly reducing the number of processes. be able to.

According to the first aspect of the present invention , it is possible to further increase the bonding area between the trim main body and the grill portion by the lowering operation of the dummy portion nest , further increasing the bonding strength of the grill portion with respect to the trim main body. Can be strengthened.

According to the second aspect of the present invention , in addition to increasing the joint area between the trim main body and the grill portion, the trim main body extends in a flange shape to the lower outer periphery of the grill portion. The impact strength of the joint portion between the two can be further strengthened.

  In a further preferred embodiment of the method of the present invention, the molten resin is supplied into the grill part cavity through an inclined runner set to be inclined from the gate as a structure for supplying the molten resin to the grill part cavity. Thus, the area of the dummy part is made compact.

  According to this embodiment, the gate for supplying the molten resin to the grill part cavity can be set outside the grill part, the area of the dummy part can be reduced, the product design and , Restrictions imposed on mold processing can be relaxed.

As described above, the molding process of the multicolor molding article according to the first and second invention defines a general part cavity by clamping the molding upper and lower molds, injection filling a molten resin into the general portion in the cavity Thus, after forming the trim body into the required shape, the punching insert is moved to newly form a grill part cavity so as to be connected to the trim body. Since the trim body and the grill part are integrally molded by injection filling with different molten resin, the molding equipment can be simplified by using the same molding die, and the cost of shortening the number of processes can be reduced. It has the effect that it can invite down.

  Further, according to the method of the present invention, in addition to the lower punching insert, a dummy part insert is newly provided so as to be movable up and down, and the dummy part insert is lowered so that the dummy body insert is lowered. Area of the trim body and the grill part by setting an outer peripheral rib on the outer periphery of the upper punching insert and achieving a shear structure between the outer peripheral rib and the lower mold Various effects that the degree of freedom of design of the grill part and the degree of mold processing can be improved by a method of increasing the width of the grill part or adopting an inclined runner so that the gate can be set outside the grill part Have

  Hereinafter, as an example of a multicolor molded product and a molding method thereof according to the present invention, an embodiment related to a door trim equipped with a speaker grill will be described in detail. Note that the gist of the present invention is as described in the scope of claims, and the contents of the first to fourth embodiments described below are merely examples of the present invention. Absent.

  FIG. 1 to FIG. 7 show a first embodiment of the present invention. FIG. 1 is a front view showing the structure of a top and bottom split type door trim, and FIG. 2 is a cross-sectional view showing the structure of a door trim lower in the vehicle door trim. FIG. 3 is an explanatory view showing a schematic configuration of a molding die used for forming the door trim lower, and FIG. 4 is an explanatory view showing a state at the time of forming the trim main body when the door trim lower is formed. 5 is an explanatory view showing a state when the speaker grill is molded at the time of molding the door trim lower, FIGS. 6 and 7 show a modification of the first embodiment of the present invention, and FIG. 6 is a trim body molding at the door trim lower. FIG. 7 is an explanatory view showing a state at the time of speaker grill molding.

  1 and 2, the door trim 10 having a vertically divided structure is generally composed of a door trim upper 20 and a door trim lower 30, and each uses a conventional molding method such as an injection molding method or a mold press molding method. It is molded into a required shape using a thermoplastic resin such as a polypropylene resin, a polypropylene resin mixed with a filler, an ABS resin, or a polyethylene resin. Although not shown, the door trim upper 20 and the door trim lower 30 are provided with a mounting boss projecting from one side toward the other side, whereas a mounting hole is opened on the other side, Is inserted into the mounting hole, and the front end of the mounting boss is crimped and joined by ultrasonic caulking, thermal welding caulking, or the like, so that the door trim upper 20 and the door trim lower 30 are firmly integrated.

  In the present invention, the door trim lower 30 includes a trim main body 31 and a speaker grill 32. In particular, a resin having a different color from that of the trim main body 31 and the speaker grill 32 is used, so that the door trim lower is inexpensive and can be performed in a short time. 30 can be formed. That is, as is apparent from FIG. 2, the trim main body 31 and the speaker grill 32 in the door trim lower 30 are integrated at the joint portion between them, and assembly mechanisms such as screws and clips are eliminated.

  Before describing the method of the present invention, the configuration of a molding die 40 for carrying out the method of the present invention will be described with reference to FIG. In the drawing, the molding die 40 is generally composed of a molding upper mold 50, a molding lower mold 60, and two injection machines 70a and 70b provided continuously to the molding lower mold 60. More specifically, the molding upper die 50 can be moved up and down by a predetermined stroke by driving the elevating cylinder 51, a cavity portion 52 is set in order to form the curved surface shape of the door trim lower 30, and the speaker grille 32 is compatible. A punching insert 53 and a cylinder 54 for driving the punching insert 53 are provided at the locations. Further, a gas spring mechanism can be used instead of the cylinder 54.

  On the other hand, the molded lower mold 60 includes a core portion 61, and hot runners 62a and 62b that serve as resin passages for the molten resins M1 and M2 from the two injection machines 70a and 70b, and gates 63a and 63b, respectively. ing. Here, molten resin M1 for molding the trim body 31 is supplied from the one side injection machine 70a through the hot runner 62a and the gate 63a, and from the other side injection machine 70b to form the speaker grill 32. Molten resin M2 for forming the speaker grill 32 is injected and filled into the grill cavity C2 through the hot runner 62b and the gate 63b. Although not shown in FIG. 3, a guide post (not shown) is provided to keep the pressing posture appropriate when the upper mold 50 is moved up and down, and the molded product after molding is demolded. In order to do this, an ejector mechanism (not shown) is attached to the molded lower mold 60.

  Furthermore, in order to form the speaker grille 32, the lower punching insert 64 and the cylinder 65 that drives the lower punching insert 64 are set in the lower mold 60 so as to correspond to the punching insert 53 of the upper mold 50. In addition, a dummy portion 64a is set on the outer periphery of the lower punching insert 64, and a gate 63b is set on the dummy portion 64a.

  Next, the molding process of the door trim lower 30 will be described. In the molding die 40 shown in FIG. 3, the molding upper mold 50 is lowered to the bottom dead center by driving the lifting cylinder 51, and the molding upper and lower molds 50, 60 are clamped. . The molten resin M1 is injected and filled into the general cavity C1 defined between the upper and lower molds 50 and 60 through the injection machine 70a, the hot runner 62a, and the gate 63a on one side, so that the trim body 31 has the required shape. Molded. At this time, as shown in FIG. 4, outer peripheries of the punching insert 53 of the upper mold 50 and the punching insert 64 on the lower side so that the molten resin M1 forming the trim body 31 does not enter the speaker grille 32 side. The part between the upper surface along the outer peripheral edge of the dummy portion 64a set to be in a parting state, and the sealing action of both prevents the molten resin M1 from leaking to the speaker grille 32 side, and the trim body 31 is molded well. Is done.

  Then, after the trim body 31 is molded, the cylinder 65 in the lower mold 60 is driven and the punching insert 64 is raised, so that the punching insert 53 of the upper mold 50 is pushed upward, and the speaker grille is raised. 32 is newly formed, and the molten resin M2 is passed through the gate 63b set in the other-side injection machine 70b, hot runner 62b, and dummy part 64a in the grill part cavity C2. Supplied. The molten resin M2 is supplied with a resin material having a color different from that of the molten resin M1 on one side. Therefore, the trim body 31 and the speaker grill 32 can be formed in a continuous process using the same molding die, and the trim body 31 and the speaker grill 32 having different colors can be integrally formed efficiently.

  6 and 7 show a modification of the present invention. The resin is formed by a shear structure between the punching insert 53 of the molding upper die 50 and the inner wall surface 64b of the dummy portion 64a in the molding lower die 60. The structure that seals is adopted. Accordingly, when the molten resin M1 is injected and filled into the general part cavity C1 in order to form the trim body 31, the outer peripheral surface of the punching insert 53 disposed in the upper mold 50 and the dummy part in the lower mold 60 are formed. Due to the shear structure of the inner wall surface 64b of 64a, the molten resin M1 does not flow into the grill portion cavity C2, and good sealing performance is maintained. Then, as shown in FIG. 7, when the speaker grill 32 is formed, the lower punching insert 64 is raised by driving the cylinder 65, whereby the upper punching insert 53 is pushed up, and the molten resin M2 covers a large volume. Is injected and filled, and as shown in the drawing, the bonding strength between the trim main body 31 and the speaker grill 32 can be enhanced by increasing the amount of resin at the bonding portion.

  FIGS. 8 and 9 show a second embodiment of the present invention. Like the first embodiment, FIG. 8 and FIG. 9 are characterized by the joining structure of the trim main body 31 and the speaker grill 32 in the door trim lower 30. The second embodiment is characterized in that a dummy portion insert 66 is provided in a dummy portion 64 a of the lower mold 60 corresponding to the speaker grill 32 so as to be movable up and down by a cylinder 67. When the trim body 31 is formed, as shown in FIG. 8, the sealing performance is maintained by the parting structure between the punching insert 53 and the dummy portion insert 66 in the forming upper die 50. There is no possibility that the molten resin M1 injected and filled into the general cavity C1 of the main body 31 leaks to the speaker grille 32 side.

  When the formation of the trim body 31 is completed, as shown in FIG. 9, the lower punching insert 64 is raised by driving the cylinder 65 to push the punching insert 53 upward, and the dummy portion insert. As 66 is lowered by the contracting action of the cylinder 67, as shown in FIG. 9, a grill part cavity C2 is formed over a wide range. The speaker grill 32 having a large joint area with the trim body 31 can be integrally formed by injecting and filling the molten resin M2 into the grill cavity C2.

  As described above, also in the second embodiment, the door trim lower 30 including the trim main body 31 and the speaker grille 32 can be continuously formed using the same molding die 40, thereby simplifying the mold equipment. In addition to being able to reduce the number of processes, in particular, by installing the dummy part insert 66 on the outer periphery of the punching insert 64 of the molding lower mold 60, the amount of resin at the joining portion is increased, and the trim body 31 There is an attendant advantage that the bonding strength between the speaker grille 32 and the speaker grille 32 can be further strengthened.

  10 and 11 show a third embodiment of the present invention, and FIGS. 12 and 13 show modifications of the third embodiment, respectively. The third embodiment is also applied to the door trim lower 30 including the speaker grill 32 and the trim body 31 and the molding method thereof. Accordingly, the basic configuration and the molding method are the same as those in the first embodiment, and are omitted here. Only the differences will be described. As shown in FIG. 10, in this third embodiment, an outer peripheral rib 55 projects downward along the outer periphery of the lower surface of the punching insert 53 provided in the upper molding die 50. A shear structure is achieved between the inner peripheral surface 55a of the outer peripheral rib 55 of the punching insert 53 of the upper die 50 and the dummy portion 64a provided on the outer periphery of the punching insert 64 of the lower molding die 60. Therefore, when the trim body 31 is molded, the molten resin M1 of the trim body 31 flows along the outer surface and the bottom surface of the outer peripheral rib 55 of the upper punching insert 53, and the horizontal direction, the vertical direction, the horizontal direction, and so on. Then, the molten resin M1 flows and the trim body 31 is molded.

  Thereafter, the lower punching insert 64 is lifted to lift the upper punching insert 53 upward to form a grill portion cavity C2 for forming the speaker grille 32. The grill portion cavity C2 is melted. Resin M2 is injected and filled (see FIG. 11). Further, the trim body 31 is supported in a flange shape along the outer periphery of the speaker grill 32, so that the impact strength is further strengthened by increasing the joint area and the resin of the trim body 31 turning to the lower part of the speaker grill 32. Can do.

  12 and 13 show a modification of the third embodiment. An inclined surface 55b is formed on the outer peripheral rib 55 of the punching insert 53, and the inclined surface 55b and a dummy portion in the lower mold 60 are formed. The inclined surface 64c of 64a is abutted and joined. Therefore, when the trim body 31 is molded, as shown in FIG. 12, the molten resin M1 that is well sealed and injected and filled in the general cavity C1 does not leak to the speaker grille side. When the speaker grill 32 is formed, as shown in FIG. 13, the lower punching insert 64 is raised, and the upper punching insert 53 is lifted upward to form a grill portion cavity C2. The speaker grill 32 is integrated with the trim body 31 by injection filling the cavity C2 with the molten resin M2. Then, as shown in an enlarged manner in FIG. 13, the impact strength can be further enhanced by the resin of the trim main body 31 turning downward along the outer periphery of the speaker grill 32.

  FIG. 14 shows a fourth embodiment, which is applied to a door trim lower 30 including a door trim main body 31 and a speaker grill 32 and a molding method thereof, as in the first to third embodiments. Normally, the gate 63b for the molten resin M2 is set to the dummy portion 64a. However, in this fourth embodiment, the gate 63b is set to the general portion, and the inclined runner 68 is connected to the gate 63b and the grill portion cavity C2. The communication is formed between the two. That is, the inclined runner 68 is formed by the inclined core 69 that slides on the mold structure. Therefore, since the gate 63b can be set to other than the dummy part 64a, the area of the dummy part 64a can be made compact, and the degree of freedom in shaping the speaker grill 32, the degree of freedom in designing the mold, and the degree of freedom in processing can be increased. .

  In the first to fourth embodiments described above, the structure of the door trim lower 30 in the door trim 10 having the upper and lower split structure, that is, the door trim integrally formed by using a resin whose color is changed for the trim main body 31 and the speaker grille 32. Although applied to the lower 30, it can also be applied to interior parts other than the door trim 10, and can also be applied to an air grill or the like in addition to the speaker grill 32. It can be applied to all trims integrally molded.

It is a front view which shows the door trim of the upper and lower divided structure which shows one Example of the multicolor molded article which concerns on this invention. It is sectional drawing which shows the structure of the door trim lower in the door trim shown in FIG. It is explanatory drawing which shows the whole structure of the shaping die used in order to shape | mold the door trim lower shown in FIG. It is explanatory drawing which shows the formation process of the trim main body in the formation process of the door trim lower shown in FIG. It is explanatory drawing which shows the shaping | molding process of the speaker grill in the shaping | molding method of the door trim lower shown in FIG. It is explanatory drawing which shows the formation process of the trim main body in the modification of 1st Example of this invention. It is explanatory drawing which shows the formation process of the speaker grille in the modification of 1st Example of this invention. The 2nd Example of this invention is shown and it is explanatory drawing which shows the formation process of a trim main body. It is explanatory drawing which shows the formation process of the speaker grille in 2nd Example of this invention. It is explanatory drawing which shows the formation process of the trim main body in 3rd Example of this invention. It is explanatory drawing which shows the formation process of the speaker grille in 3rd Example of this invention. It is explanatory drawing which shows the formation process of the trim main body in the modification of 3rd Example of this invention. It is explanatory drawing which shows the shaping | molding process of the speaker grille in the modification of 3rd Example of this invention. It is explanatory drawing which shows 4th Example of this invention. It is a schematic diagram which shows the door trim of the conventional upper and lower divided structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Automotive door trim 20 Door trim upper 30 Door trim lower 31 Trim main body 32 Speaker grille 40 Molding die 50 Molding upper mold 51 Lifting cylinder 52 Cavity part 53 Punching insert 54 Cylinder 55 Outer peripheral rib 60 Molding lower mold 61 Core part 62a, 62b Hot Runner 63a, 63b Gate 64 Punching insert 64a Dummy portion 64b Inner wall surface 64c Inclined surface 65 Cylinder 66 Dummy portion insert 67 Cylinder 68 Inclined runner 69 Inclined core 70a, 70b Injection machine

Claims (2)

In the molding method of the multicolor molded product (30) formed by integrally molding the trim body (31) and the grill portion (32) having different colors from each other in the same molding die (40),
A trim that molds the trim body (31) by injecting and filling molten resin (M1) from the injection machine (70a) into the general cavity (C1) defined by clamping the upper and lower molds (50, 60). A molding process of the main body (31);
The upper and lower punching inserts (53, 64) arranged in the upper and lower molds (50, 60) are moved to form a grill part cavity (C2), and the other side is formed in the grill part cavity (C2). A molding part of the grill part (32) for injecting and filling the molten resin (M2) from the injection machine (70b) and molding the grill part (32),
A dummy part insert (66) corresponding to the dummy part (64a) of the grill part (32) is arranged on the outer periphery of the punching insert (64) disposed in the molding lower mold (60), During the lifting operation of the punching insert (64), the dummy portion insert (66) is lowered by driving the cylinder (67), and the punching insert (66) and the punching insert ( method of molding a multicolor molding article, characterized in that the grill portion cavity (C2) is formed in thickness between 53). In the molding method of the multicolor molded product (30) formed by integrally molding the trim body (31) and the grill portion (32) having different colors from each other in the same molding die (40),
A trim that molds the trim body (31) by injecting and filling molten resin (M1) from the injection machine (70a) into the general cavity (C1) defined by clamping the upper and lower molds (50, 60). A molding process of the main body (31);
The upper and lower punching inserts (53, 64) arranged in the upper and lower molds (50, 60) are moved to form a grill part cavity (C2), and the other side is formed in the grill part cavity (C2). A molding part of the grill part (32) for injecting and filling the molten resin (M2) from the injection machine (70b) and molding the grill part (32),
Along the outer periphery of the punching insert (53) disposed in the upper die (50), the outer peripheral rib projecting downward (55) is formed, said at the outer peripheral rib (55) and lower mold (60) Sealing performance is achieved by the shear structure between the grill portion (32) and the portion corresponding to the dummy portion (64a) , and the lower punching insert (64) rises, so that the molding upper die (50) When the punching insert (53) is raised, the outer rib (55) of the punching insert (53) and the shear structure of this portion support the grill portion (32) along the outer periphery of the grill portion (32). A method for forming a multicolor molded product, wherein a flange is formed.

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