JP2020179585A - Molded body - Google Patents

Abstract

To provide a molded body capable of suppressing dew condensation on a duct outer wall and neighboring members by eliminating a spatial restrictions caused by the neighboring members such as an interior panel.SOLUTION: According to the present invention, a molded body includes first and second plate-like members that are in contact with each other on first and second contact surfaces. The first plate-like member has a duct. The second plate-like member is provided with a recess on the second contact surface, and one end thereof is connected to one end of the first plate-like member via a hinge.SELECTED DRAWING: Figure 1

Description

The present invention relates to a molded product.

In the manufacturing industry, blow molding is carried out in which a parison is arranged between a pair of split dies, the split dies are molded, and air blow is performed to form a molded product. By blow molding, a member requiring a hollow region can be molded. Examples of the member requiring a hollow region include a duct used as an automobile part or the like (Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-194700

By the way, depending on the fluid that circulates the duct used as an automobile part or the like, dew condensation may occur on the outer wall of the duct. Furthermore, since another member such as an interior panel is located in the vicinity of the duct, there is a large space constraint for devising measures to prevent dew condensation, and dew condensation also occurs on another member such as the interior panel in the first place. In particular, it is not preferable that dew condensation occurs in a place where the user directly sees or contacts, such as an interior panel.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a molded body capable of eliminating the spatial restrictions caused by nearby members such as interior panels and suppressing dew condensation on the duct outer wall and nearby members. To do.

According to the present invention, the molded body includes first and second plate-shaped members that are in contact with each other on the first and second contact surfaces, and the first plate-shaped member has a duct. The second plate-shaped member is provided with a recess on the second contact surface, and one end thereof is connected to one end of the first plate-shaped member via a hinge. , Molds are provided.

In the molded product according to the present invention, the first plate-shaped member is provided with a duct, and the second plate-shaped member is connected to the first plate-shaped member via a hinge and is in contact with the first plate-shaped member. A recess is formed in the member. The space surrounded by the recess and the first contact surface of the first plate-shaped member contributes to the prevention of dew condensation on the duct and its neighboring members. Then, by using the second plate-shaped member as it is as the interior panel, the problem of spatial restrictions described above can be solved.

Preferably, the following inventions may be provided.
A molded product further comprising a heat insulating material, the heat insulating material being configured to occupy a space surrounded by the recess and the first contact surface.
In the molded product, the heat insulating material is installed on a first contact surface which is an outer wall surface of the duct.
In the molded body, if the volume of the heat insulating material in a steady state is defined as V1 and the volume after the bending step is defined as V2, the molded body satisfies V1> V2.

FIG. 1A is a perspective view of a molded product according to the first embodiment after a bending step. FIG. 1B is a perspective view from another angle after the bending step of the molded product according to the first embodiment. FIG. 2A is a front view of the molded product according to the first embodiment after the bending step. FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A. FIG. 3A is a perspective view of the molded product according to the first embodiment before the bending step. [FIG. 3B] A perspective view from an angle different from that of FIG. 3A. FIG. 4A is a front view of the molded product according to the first embodiment before the bending step. FIG. 4B is a cross-sectional view taken along the line BB in FIG. 4A. The conceptual diagram which shows the molding machine. FIG. 6A is a diagram showing a positional relationship between a split mold and a parison before molding. FIG. 6B is a diagram showing a state in which the split mold of FIG. 6A is molded. The cross-sectional view of the molded article which concerns on 2nd Embodiment. FIG. 8A is a cross-sectional view of a molded product according to a modified example of the second embodiment before a bending step. FIG. 8B is a cross-sectional view of a molded product according to a modified example of the second embodiment after a bending step.

Hereinafter, embodiments will be described with reference to the drawings. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each feature.

1. 1. First Embodiment
1A and 1B are perspective views of the molded body 1 after the bending step from two directions. Further, FIG. 2A shows a front view of the molded body 1 after the bending step, and FIG. 2B shows a cross-sectional view taken along the line AA in FIG. 2A. 3A and 3B are perspective views of the plate-shaped structure 10 which is a state before the bending step of the molded body 1 according to the first embodiment from two directions. Further, FIG. 4A shows a front view of the plate-shaped structure 10, and FIG. 4B shows a sectional view taken along line BB in FIG. 4A.

The plate-shaped structure 10 is composed of a first plate-shaped member 11 and a second plate-shaped member 12, the first plate-shaped member 11 is the first contact surface 11s, and the second plate-shaped member is the first. Each of the two contact surfaces 12s is provided. Here, the case where the two contact surfaces are both flat is shown, but a curved surface can be used as long as they can contact each other after the bending step.

The lower end of the first plate-shaped member 11 in FIG. 4B and the upper end of the second plate-shaped member 12 are connected via a thin-walled portion H. The plate-shaped structure 10 can be integrally molded by a manufacturing method described later, and the thin-walled portion H formed by controlling the thickness to be thin can function as a hinge.

The first plate-shaped member 11 includes a duct 11d in a direction protruding in a direction opposite to the first contact surface 11s. It should be noted that the first contact surface 11s and the second contact surface 12s have a shape that allows contact after the bending step. The duct 11d can have a shape and dimensions suitable for the type and flow rate of the fluid flowing inside. In FIGS. 2B and 4B, the first contact surface 11s side of the duct 11d is shown to be flat, but if it is within the range of the recess 12g described later, the duct 11d may have a shape protruding toward the recess 12g side. It is possible.

The second contact surface 12s includes a recess 12g. As will be described later, the recess 12g functions as an air insulation region after the bending step. The minimum volume is required for the air insulation region, but even if the volume is increased to a certain extent or more, the improvement in insulation performance is poor, and there is a problem that the thickness of the molded body 1 as a whole increases unnecessarily. Occur. Therefore, it is preferable that the volume of the recess 12g is within a certain range. Specifically, when the height of the duct 11d is defined as h and the depth of the recess 12g is defined as d in the direction perpendicular to the first contact surface 11s and the second contact surface 12s, 0 <d / h. ≤0.25 is satisfied. Further, preferably, d / h = 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0. .11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23 , 0.25, 0.25, and may be between any two of these values.

As shown in FIG. 3B, the recess 12e is provided with the recess 12e at both ends in the longitudinal direction. The presence of the two recessed longitudinal end portions 12e can increase the strength of the entire second plate-shaped member 12 against warpage. Further, by making the concave end portion 12e hollow in the vertical direction in FIG. 3B, it is possible to make a space continuous with the two hollow regions 12v shown in FIG. 4B, and at the time of air blowing in the blow molding step described later. The blow pin for the second plate-shaped member 12 can be done at one place.

Further, FIG. 4B shows a case where a hollow region 12v is provided in a portion of the second plate-shaped member 12 adjacent to the recess 12g. A configuration in which the hollow region 12v is not secured is possible, but by providing the hollow region 12v, it is possible to improve the heat insulating performance of the entire molded product 1 and reduce the weight.

Here, the bending step is performed around the thin portion H that functions as a hinge. The bending process will be described later. After the bending step, the first plate-shaped member 11 and the second plate-shaped member 12 are fixed by the rivet 2 (push rivet). The fixing method is not limited to rivets, and other means such as clips can also be used.

As shown in FIG. 2B, the first contact surface 11s on the back side where the duct 11d is located coincides with the position of the recess 12g provided in the second plate-shaped member 12. At this time, the recess 12g functions as an air insulation region. Therefore, it is possible to suppress the occurrence of dew condensation on the back surface of the recess 12g in the second plate-shaped member 12, that is, the back surface of the duct 11d as the entire molded body 1 after the bending step.

As shown in FIGS. 3B and 4A, there are cut portions 11c at the two corners of the first plate-shaped member 11 on the side of the second plate-shaped member 12, while the second plate-shaped member 12 has a notch portion 11c. The two corners on the plate-shaped member 11 side of 1 are R-shaped corner portions 12c. The shapes of the cut portion 11c and the R-shaped square portion 12c are not limited, but it should be noted that the cut portion 11c is cut out larger. By doing so, as shown in FIG. 2A, after the bending step, the cut portion 11c can be located inside as compared with the R-shaped square portion 12c. By doing so, for example, when the molded product is used as an interior panel of an automobile, the cut portion 11c is hidden from the inside of the automobile, which has an advantage that the appearance is not impaired.

2. Production method
A method for manufacturing the molded product 1 according to the first embodiment will be described. The manufacturing method according to the present embodiment includes a molding step and a bending step. Hereinafter, each step will be described in detail.

2.1 Molding machine In this section, the molding machine will be described first using drawings. FIG. 5 is a conceptual diagram of a molding machine 5 that can be used to carry out the method for manufacturing the molded product 1 according to the first embodiment. The molding machine 5 includes a resin supply device 51, a head 56, a first split mold 57, and a second split mold 58. The resin supply device 51 includes a hopper 52, an extruder 53, and an accumulator 55. The extruder 53 and the accumulator 55 are connected via a connecting pipe 54a. The accumulator 55 and the head 56 are connected via a connecting pipe 54b. Hereinafter, each configuration will be described in detail.

<Hopper 52, extruder 53>
The hopper 52 is used to put the raw material resin 61 into the cylinder 53a of the extruder 53. The form of the raw material resin 61 is not particularly limited, but is usually in the form of pellets. The raw material resin 61 is, for example, a thermoplastic resin such as polyolefin, and examples of the polyolefin include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer, and a mixture thereof. The raw material resin 61 is charged into the cylinder 53a from the hopper 52 and then heated in the cylinder 53a to be melted into a molten resin. Further, it is conveyed toward the tip of the cylinder 53a by rotation of a screw (not shown) arranged in the cylinder 53a. The screw is arranged in the cylinder 53a, and the molten resin is kneaded and conveyed by its rotation. A gear device is provided at the base end of the screw, and the screw is rotationally driven by the gear device. The number of screws arranged in the cylinder 53a may be one or two or more.

<Accumulator 55, head 56>
The molten resin 62 is extruded from the resin extrusion port of the cylinder 53a and injected into the accumulator 55 through the connecting pipe 54a. The accumulator 55 includes a cylinder 55a and a piston 55b slidable inside the cylinder 55a, and the molten resin 62 can be stored in the cylinder 55a. Then, by moving the piston 55b after a predetermined amount of the molten resin 62 is stored in the cylinder 55a, the molten resin 62 is pushed out from the die slit provided in the head 56 through the connecting pipe 54b and hung down to cause the parison 63. Form. Here, the shape of the parison 63 is not particularly limited, but is preferably tubular. This will be described in detail later.

<First split mold 57 and second split mold 58>
The parison 63 is guided between the first split mold 57 and the second split mold 58. The molded body 1 is obtained by integrally molding the parison 63 using the first split mold 57 and the second split mold 58. The molding method using the first split mold 57 and the second split mold 58 is not particularly limited, and air is blown into the cavities of the first split mold 57 and the second split mold 58. It may be blow molding for molding, or vacuum forming for molding the parison 63 by reducing the pressure inside the cavity from the inner surface of the cavities of the first split die 57 and the second split die 58. , The combination may be used. When the molten resin contains a foaming agent, the parison 63 becomes a foamed parison, and the molded body 1 becomes a foamed molded product. In the present embodiment, the parison 63 has a tubular shape, but the parison 63 may have a sheet shape.

2.2 Each step of the manufacturing method The molded body 1 can be formed by a method including a parison forming step, a molding step, a post-treatment step and a bending step. Hereinafter, each step will be described in detail.

<Parison formation process>
In the parison forming step, as shown in FIG. 5, the molten resin is extruded from the head and hung down to form the parison 63, and the parison 63 is arranged between the first split mold 57 and the second split mold 58. To do. The arrangement of the parison 63, the first split mold 57, and the second split mold 58 is shown in FIG. 6A. The first split mold 57 defines the shapes of the first contact surface 11s and the second contact surface 12s, and has a convex portion at a position corresponding to the concave portion 12g of the second plate-shaped member 12. doing. On the other hand, the second split mold 58 defines the shape of the back side of the first contact surface 11s and the second contact surface 12s, and the first plate-shaped member 11 and the second plate-shaped member 12 It has a dent corresponding to, and particularly has a large dent at a position corresponding to the duct 11d. Further, the second split mold 58 is a convex shape linear in the depth direction of FIG. 6A at a position at the boundary between the first plate-shaped member 11 and the second plate-shaped member 12, which is pointed by HP in FIG. 6A. Has a part.

<Molding process>
In the molding step, as shown in FIG. 6B from the state of FIG. 6A, the first split mold 57 and the second split mold 58 are molded and air blown. By this molding step, the parison 63, which has been formed into two layers in FIG. 6A, is welded to form a plate-like structure 10. At this time, the duct 11d and the hollow region 12v are formed in a hollow state at the position where the second split mold 58 has a large recess.

<Post-treatment process>
In the post-treatment step, a cooling time is allowed after mold clamping, and the solidified plate-like structure is taken out from the first split mold 57 and the second split mold 58. Since the burr 64 is attached at the time of taking out, remove it. As a result, the plate-like structure 10 having the configurations shown in FIGS. 3 and 4 is obtained. That is, the plate-shaped structure 10 includes a recess 12g, a thin-walled portion H, and a duct 11d, and the thin-walled portion H is linearly provided between the recess 12g and the duct 11d.

<Bending process>
In the bending step, the plate-shaped structure 10 is bent along the thin portion H to bring the first contact surface 11s and the second contact surface 12s into contact with each other. That is, the thin portion H can be used as a hinge. After that, the molded body 1 is completed by fixing the first plate-shaped member 11 and the second plate-shaped member 12 by using a method such as a rivet or a clip.

3. 3. Second embodiment
Subsequently, the molded body 1 according to the second embodiment will be described. FIG. 7 shows a cross-sectional view of the molded product 1 according to the second embodiment. It should be noted that the heat insulating material 3 occupies a space surrounded by the first contact surface 11s and the recess 12g. By providing the heat insulating material 3, higher heat insulating performance can be obtained as compared with the case where the hollow region is heat-insulated only with air. The material of the heat insulating material 3 is not limited, but it is preferable to use a foamable resin. Specifically, for example, urethane foam.

Further, as a modification of the second embodiment, FIG. 8A shows a cross-sectional view before the bending step when the heat insulating material 3 does not occupy a space surrounded by the first contact surface 11s and the recess 12g, after the bending step. A cross-sectional view of is shown in FIG. 8B. As shown in FIG. 8B, the recess 12g is not filled with the heat insulating material 3 and remains as a space even after the bending step.

After the plate-shaped structure 10 is formed, the heat insulating material 3 is installed on the first contact surface 11s which is the outer wall surface of the duct 11d as shown in FIG. 8A before the bending step, and proceeds to the bending step. As shown in the above, it can be arranged in a space surrounded by the first contact surface 11s and the recess 12g. The first contact surface 11s on the back side of the duct 11d has few irregularities, and high workability can be ensured.

Further, the heat insulating material 3 preferably has a size that is compressed during the bending step in order to make it difficult for the heat from the duct 11d to be transferred to the second plate-shaped member 12. In other words, when the volume of the heat insulating material 3 in the steady state (before the bending step) is defined as V1 and the volume after the bending step is defined as V2, it is preferable that V1> V2 is satisfied.

The dimensions will be described in more detail. In FIG. 8A, the width of the duct 11d on the second plate-shaped member 12 side is defined as A, the width attached to the first plate-shaped member 11 of the heat insulating material 3 is defined as B, and the opening width of the recess 12g is defined as C. First, by setting A ≦ B, the surface of the duct 11d on the second plate-like member 12 side can be completely covered with the heat insulating material 3. On the other hand, if the width B attached to the first plate-shaped member 11 of the heat insulating material 3 is made too large, the amount of the heat insulating material increases, and the cost increases. Therefore, the range of A and B is preferably in a certain range. Specifically, 1.0 ≦ B / A ≦ 1.5 is satisfied. More preferably, 1, 1.02, 1.04, 1.06, 1.08, 1.1, 1.12, 1.14, 1.16, 1.18, 1.2, 1.22, 1.24, 1.26, 1.28, 1.3, 1.32, 1.34, 1.36, 1.38, 1.4, 1.42, 1.44, 1.46, 1. It is any of 48 and 1.5, and may be between any two of these values.

Further, the opening width C of the recess 12g is preferably a value equal to or larger than the width A on the second plate-shaped member 12 side of the duct 11d, that is, a state of A ≦ C. By doing so, as shown in FIG. 8B, compression does not occur in the portion of the heat insulating material 3 in contact with the surface of the duct 11d on the side of the second plate-shaped member 12, and a high heat insulating effect can be expected. On the other hand, if the opening width C of the recess 12g is made extremely large, there is a drawback that the strength of the molded product as a whole is reduced. Therefore, the range of A and C is preferably in a certain range. Specifically, 1.0 ≦ C / A ≦ 1.3 is satisfied. More preferably, 1, 1.02, 1.04, 1.06, 1.08, 1.1, 1.12, 1.14, 1.16, 1.18, 1.2, 1.22, It is a numerical value of 1.24, 1.26, 1.28, or 1.3, and may be between any two of these numerical values.

Further, the width B attached to the first plate-shaped member 11 of the heat insulating material 3 is preferably a value equal to or larger than the opening width C of the recess 12g, that is, a state of C ≦ B. By doing so, the thinly compressed heat insulating material 3c is present in the region indicated by the middle circle in FIG. 8B. As a result, it can be said that V1> V2 is satisfied when the volume of the heat insulating material 3 in the steady state (before the bending step) is defined as V1 and the volume after the bending step is defined as V2. By sandwiching the heat insulating material 3c thinly compressed with a material such as urethane foam between the first plate-shaped member 11 and the second plate-shaped member 12, rattling is less likely to occur and abnormal noise due to vibration is suppressed. It becomes possible. On the other hand, if the width B attached to the first plate-shaped member 11 of the heat insulating material 3 is made too large, the amount of the heat insulating material increases, and the disadvantage that the cost increases comes out with the above-mentioned B / A ratio. The same is true. Therefore, the range of C and B is preferably in a certain range. Specifically, 1.0 ≦ B / C ≦ 1.3 is satisfied. Even more preferably, 1,1.02, 1.04, 1.06, 1.08, 1.1, 1.12, 1.14, 1.16, 1.18, 1.2, It is a numerical value of 1.22, 1.24, 1.26, 1.28, or 1.3, and may be between any two of these numerical values.

4. Conclusion As described above, according to the present embodiment, it is possible to provide a molded body capable of eliminating the spatial restrictions caused by the neighboring members such as the interior panel and suppressing the dew condensation on the duct outer wall and the neighboring members.

Such a molded body includes first and second plate-shaped members that are in contact with each other on the first and second contact surfaces, and the first plate-shaped member includes a duct and a second plate-shaped member. Is provided with a recess in the second contact surface, and one end is connected to the one end of the first plate-like member via a hinge.

Although the embodiments of the present invention have been described, they are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

1: Molded body 2: Rivet 3: Insulation material 3c: Compressed insulation material 5: Molding machine 10: Plate-like structure 11: First plate-like member 11c: Notch portion 11d: Duct 11s: First contact surface 12: Second plate-shaped member 12c: R-shaped corner portion 12e: Recessed longitudinal end 12g: Recessed 12s: Second contact surface 12v: Hollow region 51: Resin supply device 52: Hopper 53: Extruder 53a: Cylinder 54a: Connecting pipe 54b: Connecting pipe 55: Accumulator 55a: Cylinder 55b: Piston 56: Head 57: First split mold 58: Second split mold 61: Raw material resin 62: Molten resin 63: Parison 64: Bali H: Thin wall part

Claims (4)

It is a molded body
It comprises first and second plate-like members that are in contact with each other on the first and second contact surfaces.
The first plate-shaped member includes a duct and has a duct.
The second plate-shaped member is
The second contact surface is provided with a recess.
The one-sided end is connected to the one-sided end of the first plate-like member via a hinge.
Molded body. In the molded product according to claim 1,
With more insulation,
The heat insulating material is configured to occupy a space surrounded by the recess and the first contact surface.
Molded body. In the molded product according to claim 2,
The heat insulating material is installed on a first contact surface which is an outer wall surface of the duct.
Molded body. In the molded product according to claim 2 or 3.
If the volume of the heat insulating material in a steady state is defined as V1 and the volume after the bending step is defined as V2,
Satisfy V1> V2,
Molded body.