JP2019136914A - Hot pressing mold - Google Patents

Abstract

To provide a hot pressing mold that molds a three-dimensional shape by hot pressing a molding material, molds joining parts that cause a rod-like or cylindrical insert member to be joined to a molding surface, and integrally molds the insert member in a position apart from the molding surface.SOLUTION: A hot pressing mold 1 of this invention includes: molding a three-dimensional shape by hot pressing a base material W including thermoplastic resin; molding joining parts 112 and 112 that cause a rod-like or cylindrical insert member 111 to be joined to the base material W; and integrally molding the insert member 111 in a position apart from a molding surface of the base material W. The hot pressing mold is configured of a lower mold 11 that includes: a concave groove part 14 that can house the insert member 111 and perform positioning of the insert member 111 with respect to the molding surface of the base material W by housing it; and a movable insert 13 which lids the concave groove 14 leaving a part where the joining parts 112 and 112 are formed and an upper face of which becomes part of the molding surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mold used for hot-pressing a molding material mainly composed of a thermoplastic resin.

  In recent years, in order to reduce the weight of vehicles, attempts have been made to form parts that have been conventionally formed of metal with resin. For example, a vehicle door structure in which a door inner panel is formed of FRP (fiber reinforced resin) has been proposed (for example, Patent Document 1).

  By the way, in resin molding, in order to shorten an assembly process, insert molding may be performed. However, when a door beam is joined to the door inner panel, Patent Document 1 does not describe a technique using the door beam as an insert member.

JP, 2006-030467, A

  The present invention has been made in view of such circumstances, and has a bonding portion that heat-presses a molding material to form a three-dimensional shape and joins a rod-shaped or cylindrical insert member to a surface to be molded. It aims at providing the shaping | molding die for hot press which shape | molds and integrally molds the insert member in the position spaced apart from the to-be-molded surface.

In order to solve the above-mentioned problem,
A base material containing a thermoplastic resin is heated and pressed to form a three-dimensional shape, and a joining portion for joining a rod-like or cylindrical insert member to the base material is formed, and the insert member is formed on the base material. A mold for heating press that is integrally molded at a position separated from the molding surface,
It consists of an upper mold and a lower mold.
The insert member can be accommodated, and the recessed groove portion capable of positioning the insert member with respect to the molding surface of the base material by accommodating,
The movable groove is provided with a lid on the groove, leaving a portion where the joining portion is formed, and a top surface being a part of the molding surface.

  In addition, the hot pressing mold according to the present invention is suitable for molding a door inner panel of an automobile, and in this case, the insert member is a door beam.

  By adopting such a configuration, even if the rod-shaped or cylindrical insert member is disposed at a position spaced from the molding surface of the base material, the molding surface can be molded without being disturbed by the insert member. it can.

It is explanatory drawing (BB cross section) which showed the state at the time of shaping | molding of the shaping | molding die for hot presses. It is explanatory drawing which showed the state at the time of open | release of the shaping | molding die for heating presses. It is explanatory drawing (AA cross section) which showed the shaping | molding die for hot presses. It is explanatory drawing which shows the molded article shape | molded with the shaping | molding die for heating presses. It is explanatory drawing which showed the placement core. It is explanatory drawing which showed the shaping | molding die 2 for hot presses. It is another explanatory drawing which showed the shaping die 2 for hot presses.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a heating press mold according to the present invention is embodied will be described with reference to the drawings. A detailed description of known techniques is omitted.

  First, the molded product P molded by the hot press mold will be briefly described with reference to FIG. FIG. 4 is an explanatory view showing a molded product P molded by a hot press mold. The molded product P has a number of rounded portions due to the property of being a hot press-molded product, but in FIG.

  As shown in FIG. 4, a molded product P molded by a heating press mold is molded into a three-dimensional shape by subjecting a substrate W containing a thermoplastic resin to a hot press, and a cylindrical insert member 111. Are formed by integrally molding the insert member 111 at a position separated from the molding surface 113 of the substrate W.

  The base material W has a substantially flat plate shape, and is configured by impregnating fibers with polyamide, which is a thermoplastic resin. In addition, although the carbon fiber is used as a fiber used for the base material W, the kind of fiber is not limited to this.

  In the substrate W, the polyamide plays a role as a binder for connecting fibers. Further, the substrate W may be formed of only polyamide or other thermoplastic resin, or may be formed of a mixture of a thermoplastic resin other than polyamide such as polypropylene and fibers.

  The insert member 111 is a member obtained by separately molding a fiber reinforced resin material into a cylindrical shape in advance. In this embodiment, the fiber reinforced resin material is used. However, the material is not limited to this, for example, metal. Further, it may be rod-shaped.

  The joint portion 112 is formed of the same material as the base material W. The joint portion 112 is formed so as to protrude upward in the drawing of FIG. The joint 112 may be formed of a material different from that of the base material W.

(First embodiment)
Next, the configuration of the hot press mold 1 according to the first embodiment will be described mainly with reference to FIGS. FIG. 1 is an explanatory diagram (BB cross section) showing the state of the molding position of the hot press mold 1. FIG. 2 is an explanatory view showing a state when the heating press mold 1 is opened. FIG. 3 is an explanatory view (A-A cross section) showing the mold 1 for hot press.

  As shown in FIG. 1, the heating press mold 1 is mainly composed of a lower mold 11, an upper mold 12, and a movable insert 13.

  The lower mold 11 is a core mold. As shown in FIG. 2, the lower mold 11 is formed with a recessed groove portion 14 that can accommodate the insert member 111. Further, a shoulder 15 on which a movable insert 13 (described later) is placed is formed.

  As shown in FIG. 3, the concave groove 14 accommodates the insert member 111, and when the base material W is set and the mold is closed, the joint forming space 141 for forming the joint 112 at both ends of the insert member 111, 141 is formed.

  Further, the position of the concave groove portion 14 is provided so as to be a desired position with respect to the molding surface of the substrate W. That is, the recessed groove portion 14 can position the insert member 111 with respect to the molding surface of the substrate W by accommodating the insert member 111.

  Although not provided in the present embodiment, the lower mold 11 may be provided with a resin passage for injecting molten resin into the joint molding spaces 141 and 141.

  Placement cores 16 and 16 are mounted on the insert member 111 accommodated in the concave groove portion 14. This is to prevent the flexible resin material for molding the joints 112 and 112 from flowing out from the joint molding spaces 141 and 141 toward the center of the insert member 111.

  As shown in FIG. 5, the placement core 16 is divided into upper and lower parts. Then, bolts are connected from below to above. As shown in FIG. 4, in the molded product P, particularly in the vicinity of the joints 112 and 112, the molding surface of the insert member 111 and the substrate W may be close to each other (115 and 115 portions in the figure). It is structurally difficult to form the molding surface of this portion with a movable insert 13 described later. However, the molding surface of this part can be molded by making the placement core 16 into a shape as shown in FIG. 5 so that a part of the upper surface of the placement core 16 becomes a part of the molding surface. it can.

The lower mold 11 is fixed to a pressing device (not shown).
The upper mold 12 is a cavity mold. The upper die 12 is fixed to a pressing device (not shown) and is movable in the vertical direction between a molding position shown in FIG. 1 and an open position shown in FIG.

  The movable nest 13 is formed so that the short side direction fits in the concave groove 14. Moreover, the movable nest 13 is placed on the shoulder portion 15 so that the concave groove portion 14 is covered, leaving a portion where the joint portions 112 and 112 are formed, and the upper surface becomes a part of the molding surface. It has become.

  The movable insert 13 has a substantially rectangular parallelepiped shape, but as shown in FIGS. 1 and 2, the lower surface is inclined so that the side (left direction in the figure) from which the molded product P is taken out is higher. This is to make it easy to remove the molded product P from the movable insert 13.

  As shown in FIGS. 1 and 2, the movable nest 13 is disposed above the insert member 111, but is formed so as to protrude rightward in the drawings. This protruding portion is placed on the shoulder 15. In addition, a plurality of ejector pins 131 are provided below the protruding portion. Thereby, the movable insert 13 also has a function as an ejector. The movable telescopic element 13 may protrude in the left direction in the figure, but if the length in the left direction in the figure becomes long, it becomes difficult to remove the molded product P. In this embodiment, this is not the case. .

Next, a method of using the heating press mold 1 will be described.
End caps 161 and 161 are attached to both ends of the insert member 111 in advance. This is because a flexible resin material for molding the joints 112 and 112 is prevented from flowing out from the joint molding spaces 141 and 141 into the insert member 111. Then, the placement cores 16 and 16 are attached to at least both ends of the insert member 111.

  The movable insert 13 is moved upward, and the insert member 111 to which the end caps 161 and 161 and the placement cores 16 and 16 are attached is accommodated in the recessed groove portion 14. The movable insert 13 is moved downward, and the groove 14 is covered.

  The base material W is cut | disconnected to a predetermined magnitude | size, and the junction part production | generation material S is created. The joining part generating material S and the base material W are heated to such an extent that the polyamide melts and softens. The joint portion generating material S is packed in the portions to be the joint portion forming spaces 141 and 141 of the lower mold 11. The base material W is set between the lower mold 11 and the upper mold 12 in the open state. Thereafter, as shown in FIG. 1, the lower mold 11 and the upper mold 12 are closed, so that the base material W is press-molded and simultaneously the joint portions 112 and 112 are formed.

  In the process of forming the joint 112, the joint forming space 141, 141 is filled with the joint generation material S and comes into strong contact with the upper substrate W. As a result, the softened polyamide in the joint generating material S and the softened polyamide in the base W are mixed together at the portion where the joint generating material S and the base material W are in contact with each other, and they are naturally integrated (mixed and melted). ). After that, the polyamide is cooled, so that the joints 112 and 112 are molded in a state where the joints 112 and 112 are joined to the base material W. Thereby, the base material W and the insert member 111 are integrally formed in one step.

  The lower mold 11 and the upper mold 12 are opened, the movable insert 13 is moved upward, and the insert member 111 is taken out from the heating press mold 1. The placing cores 16 and 16 are removed from the insert member 111.

  For specific application of the present invention, it is preferable that the molded product P is a door inner panel and the insert member 111 is a door beam.

  According to the present invention, even if the rod-shaped or cylindrical insert member 111 is arranged at a position separated from the molding surface 113 of the base material W, the molding surface 113 is molded without being disturbed by the insert member 111. be able to.

  Moreover, the base material W and the insert member 111 can be assembled with high accuracy. Moreover, press molding of the substrate W and assembly of the insert member 111 can be performed in one step.

(Second Embodiment)
Next, the configuration of the hot press mold 2 according to the second embodiment will be described mainly with reference to FIGS. Fig.6 (a) is explanatory drawing (DD cross section) which showed the shaping | molding die 2 for hot presses. FIG. 6B is an explanatory view (C-C cross section) showing the heating press mold 2. FIG. 7 is another explanatory view (cross-section EE) showing the mold 2 for hot press. In addition, about the same structure as the shaping | molding die 1 for hot presses, it uses the same code | symbol and abbreviate | omits description. Also, description of substantially the same configuration is omitted.

  As shown in FIG. 6, the heating press mold 2 is mainly composed of a lower mold 21, an upper mold 22, and a movable insert 23.

  As shown in FIG. 7, the lower mold 21 is formed with a concave groove 24 that can accommodate the insert member 111. Further, shoulder portions 25, 25 on which a movable insert 23 (described later) is placed are formed.

  Resin passages 242 and 242 for injecting molten resin into the joint forming spaces 141 and 141 are formed in the lower mold 21. An injection device (not shown) is connected to the resin passages 242 and 242. Accordingly, the joint portions 112 and 112 are formed so as to go around the cylindrical insert member 111.

  The joint portions 112 and 112 are molded by injecting a molten resin onto the base material W in a state where the base material W is set on the heating press mold 2. That is, the joint portions 112 and 112 are molded in a state of being joined to the base material W.

  The movable insert 23 is integrated with the placing core 26. The placement core 26 is divided into left and right, and is bolted so as to be integrated with the movable insert 23 from one side to the other side.

  The upper mold 22 has a shape in which an end portion hangs down, and covers the lower mold 21 during molding. This prevents molten polyamide from protruding from the hot press mold 2.

  The movable insert 23 is formed in a plate shape except for a portion integrated with the placing core 26. In the heating press mold 2, the movable insert 23 is also attached when the molded product P is completed, so that the weight is reduced. Further, as shown in FIG. 7, the movable insert 23 is placed on the shoulders 15, 15 at both ends in the left-right direction in the drawing. This is to prevent the movable insert 23 from being bent.

  The method of using the heating press mold 2 will be described only with respect to differences from the heating press mold 1.

  The movable insert 23 and the placement cores 26 and 26 are attached to the insert member 111. This is accommodated in the groove 24.

  The substrate W is heated to such an extent that the polyamide melts and softens. The base material W is set between the lower mold 21 and the upper mold 22 in the open state. Then, the base material W is press-molded by closing the lower mold 21 and the upper mold 22.

  With the lower mold 21 and the upper mold 22 pressed, the molten resin is injected through the resin passages 242 and 242 from the injection apparatus (not shown) into the joint forming spaces 141 and 141 while the base material W is pressed. At this time, the temperature of the base material W is set to a temperature at which the polyamide inside the base material W softens.

  In the process of filling the joint molding spaces 141 and 141 with the molten resin, the molten resin penetrates into the fibers instead of the softened polyamide while pushing the softened polyamide inside the base material W upward. At the same time, the molten resin that has penetrated into the inside of the fiber is mixed with the softened polyamide inside the base material W, and is united (mixed). In this manner, the molten resin is filled in the bonding portion forming spaces 141 and 141, and then the molten resin is cooled, so that the bonding portions 112 and 112 are molded in a state of being bonded to the substrate W. Thereby, the base material W and the insert member 111 are integrally formed in one step.

  The lower mold 21 and the upper mold 22 are opened, and the molded product P is taken out together with the movable insert 23 and the placement cores 26 and 26. The movable insert 23 and the placement cores 26 and 26 are removed from the insert member 111.

  The hot press mold 2 is effective when the insert member 111 is short.

  The contents described above relate to an embodiment of the present invention, and do not mean that the present invention is limited to the above contents. For example, in this embodiment, the lower mold is fixed and the upper mold is movable, but the opposite may be used.

1 Mold for hot press 1
11: Lower mold 111: Insert member 112: Joint part 12: Upper mold 13: Movable insert 131: Ejector pin 14: Concave groove part 141: Joint part forming space
15: Shoulder
16: Placement core 161: End cap 21: Lower mold 22: Upper mold 23: Moveable insert 24: Concave groove part 242: Resin passage 25: Shoulder part 26: Placement core W: Base material P: Molded product

Claims (2)

A base material containing a thermoplastic resin is heated and pressed to form a three-dimensional shape, and a joining portion for joining a rod-like or cylindrical insert member to the base material is formed, and the insert member is formed on the base material. A mold for heating press that is integrally molded at a position separated from the molding surface,
It consists of an upper mold and a lower mold.
The insert member can be accommodated, and the recessed groove portion capable of positioning the insert member with respect to the molding surface of the base material by accommodating,
A movable nest with the upper surface being a part of the molding surface, leaving the portion where the joint portion is formed, covering the groove portion, and
Mold for heating press equipped with The molded product molded by the heating press mold according to claim 1 is an automobile door inner panel,
The insert member is a heating press mold that is a door beam.

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