JPH0455582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to, for example, a method for manufacturing an automobile interior molded product.

[Prior art] For example, in interior molded products such as integrally molded door trims for automobiles, a skin material made by laminating a foam cushioning material on the back side of a thermoplastic resin film is attached to the surface of a base material of a thermoplastic resin plate. be done. and,
Traditionally, to manufacture such interior molded products, the base material is first molded, the exterior is trimmed, and then
In a separate process, a skin material is pasted onto the surface of the molded base material using an adhesive, and the end portion of the skin material is cut leaving a wrapping allowance, and then the end portion of the skin material is wrapped around the back side of the base material. It was attached using adhesive.

[Problem that the invention seeks to solve]

However, conventional methods for manufacturing interior molded products require a large number of manufacturing steps, resulting in high costs, and there are also problems such as damage to the product when it is transported between manufacturing processes.

The present invention solves such conventional problems, and in manufacturing an interior molded product with a so-called three-layer integrated structure of a skin film, a cushioning material (skin material), and a base material, it is possible to The purpose of the present invention is to provide a manufacturing method for interior molded products that can improve work efficiency and reduce costs by performing each step of outer circumference trimming and end treatment at the same time, as well as finish the end portion with a beautiful appearance. shall be.

[Means for solving problems]

Means for achieving the above object will be explained based on FIGS. 1 to 6, which correspond to embodiments.

The method of the present invention uses an apparatus as shown in FIG. That is, this device includes a lower mold 2 in which a coil 5 of an electromagnetic induction heating device is incorporated in a side portion 4, and a mold surface 6 corresponding to the lower mold 2 and located outside the side portion 4 of the lower mold 2. It consists of a mold 1 consisting of an upper mold 3 having a falling edge 7 formed at its end, and a cutting blade 8 made of a ferromagnetic material and movable with respect to the side 4 of the lower mold 2. It is something.

Using this device, a base material 11 made of a thermoplastic resin material or a composite material thereof constituting an interior molded product, and a skin material 12 with a cushioning material 14 pasted on the back side of a skin material 13 made of a thermoplastic resin material. are stacked in a heated state and set in the lower mold 2, the mold 1 is clamped to form the base material 11 and the skin material 12, and the two are thermally bonded, and the falling edge 7 of the upper mold 3 is The end portions 15 of the base material 11 and the skin material 12 are bent and lowered along the side portion 4 of the lower mold 2, and then the cutting blade 8 is moved toward the side portion 4 of the lower mold 2 and the end portions 15 are bent. and in that state, coil 5.
The terminal portion 15 is cut by applying a high frequency current.

[Effect]

First, the base material 11 and the skin material 12 are molded and bonded together using the mold 1. Then, the cutting blade 8 is moved toward the side portion 4 of the lower mold 2 and pressed against the terminal portion 15. At this time, the terminal portion 15 is crushed by the tip of the cutting blade 8 and is cut off to some extent, but is not completely cut off.

Therefore, the coil 5 provided on the side part 4 of the lower mold 2 is energized while the cutting blade 8 is pressed against the terminal part 15 as a support for the side part 4 of the lower mold 2.

In this case, since the cutting blade 8 is made of ferromagnetic material,
When a high frequency current is applied to the coil 5, the cutting blade 8 in the vicinity of the coil 5 is placed in an alternating magnetic field generated around the coil 5, and generates heat due to hysteresis loss. Therefore, by applying heat due to electromagnetic induction to the tip of the cutting blade 8, the base material 1
1 and the end portions of the skin material 12, even the parts where the cutting is incomplete only by pressing the cutting blade 8 are cut cleanly and the outer periphery is trimmed.

In addition, during this trimming, when the cutting blade 8 advances toward the side 4 of the lower die 2 and its tip hits the skin material 12, the cushioning material 14 in the skin material 12 is crushed by the pressure. The skin 13 may melt and expand, and at the cut end, the outermost skin 13 surrounds the ends of the cushioning material 14 and the base material 11 (Fig. 6), and the end is processed. is done at the same time as trimming.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a diagram showing the state in which the material for the interior molded product is set in the equipment, Figure 2 is an explanatory diagram of the molding and crimping process, and Figure 3 is an explanatory diagram of the process of trimming the outer periphery after the molding process. .

First, the apparatus and molded article material used in the present invention will be explained.

As shown in FIG. 1, the device consists of a lower die (male die) 2 and an upper die (female die) 3 that constitute a stamping mold 1, and a cutting blade 8 that constitutes a trimming die. A coil 5 of an electromagnetic induction heating device (not shown) is incorporated in the side part 4, and an upper mold 3 corresponding to the lower mold 2 is attached to the end of the mold surface 6 at a position outside the side part 4 of the lower mold 2. A falling edge 7 is formed.

As the electromagnetic induction heating device, any conventionally known one may be used, and the mold 1 has basically the same configuration as a conventional stamping mold, and there is a cooling pipe inside the mold. It is equipped with
However, the stamping mold 1 is made of a non-magnetic material so that the magnetic field generated around the coil 5 when a high-frequency current is applied to the coil 5 incorporated in the lower mold 2 is not affected.

Further, a cutting blade 8 is disposed on the side of the lower mold 2, and is moved toward the side portion 4 of the lower mold 2 by driving of an air cylinder 9. The cutting blade 8 is made of a ferromagnetic metal material such as iron or stainless steel, and the cutting blade 8 and the coil 5 in the lower mold 2 are provided in corresponding positions. Further, although the tip of the cutting blade 8 is sharp to some extent, it is not completely sharp.

As for the materials of the interior molded product, as shown in FIG. A skin material 12 is used in which a cushioning material 14 made of a material is laminated on the back side of a skin 13 having thermoplasticity such as a polyvinyl chloride film.

The illustrated embodiment will be explained by taking the door trim of an automobile as an example, and FIG. 4 is a perspective view of the door trim, and FIG. 5 is a sectional view taken along line A--A.

In the present invention, an interior molded product is manufactured using the above-mentioned materials using the apparatus having the above-mentioned configuration.
The manufacturing process will be described below in order.

First, as shown in FIG. 1, a stamping mold 1 is installed in a press device (not shown).
The material is set in the mold 1 by placing the heated and converted base material 11 on the lower mold 2, and further placing the heated and softened skin material 12 thereon. Then, the upper mold 3 descends.

FIG. 2 shows a state in which the upper mold 3 has been lowered and clamped, and as a result, the base material 11 and the skin material 12
are molded within the mold 1 and are thermally bonded at the same time. At this time, the terminal portion 1 of the base material 11 and the skin material 12
5 is bent at a falling edge 7 formed at the end of the mold surface 6 of the upper mold 3 and hangs down along the side 4 of the lower mold 2.

When the forming and pressing process shown in FIG. 2 is completed, the material is allowed to radiate heat for some time, and then the trimming process shown in FIG. 3 is started. That is, the cutting blade 8 driven by the air cylinder 9 moves in parallel toward the end portion 15 of the material hanging on the side portion 4 of the lower mold 2. As a result, the end portions 15 of the base material 11 and the skin material 12 are pushed off by the cutting blade 8 and are cut to some extent, but not completely.

In addition, at this time, the outer skin 13 is attached to the cushioning material 14 and the base material 1.
wrap around the cut ends of 1 or those ends that are not completely cut.

Then, when a high frequency current is applied to the coil 5 arranged on the side part 4 of the lower mold 2 while the cutting blade 8 is pressed against the end part, the cutting blade 8 is heated and the incompletely cut part of the end part 15 is fused. and the outer periphery is trimmed.

FIG. 6 shows the end portion of the material that has been trimmed on the outer periphery, and as shown in the figure, the outer periphery has been trimmed together with the base material 1.
1 and the cut ends of the cushioning material 14 are covered with the skin 13, and the ends are neatly processed.

Note that if the power supply to the coil 5 is stopped immediately after the trimming process is finished, the tip of the cutting blade 8 will be quickly cooled, and when the cutting blade 8 is returned to its original position, the skin 13 and the like will melt and adhere to the cutting edge. You can finish it neatly without having to do anything. In order to prevent material from adhering to the cutting edge, the surface of the cutting blade made of iron or stainless steel can be treated with Teflon, for example.

Furthermore, the cutting blade 8 using an electromagnetic induction heating device
For heating, it is sufficient to locally heat the tip of the cutting blade 8, and the heating current and time of the coil 5,
Conditions such as energization timing are determined as appropriate.
When this electromagnetic induction heating device is used, it is superior to other heating methods in that the cutting blade 8 can be heated and cooled in a very short time by controlling the current flow to the coil 5.

〔Effect of the invention〕

As described above, in the present invention, the base material and the skin material are formed and attached at the same time, and then the outer periphery is trimmed and the end portion is processed, and these steps can be performed continuously using the same molding device. It has excellent work efficiency and can reduce manufacturing costs.

In addition, since heat is applied to the cutting blade by electromagnetic induction heating, trimming and end treatment can be performed reliably and easily, and the product can be finished with a beautiful appearance.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the interior molded product material set in the mold device, Figure 2 is an explanatory diagram of the molding and crimping process, Figure 3 is an explanatory diagram of the outer periphery trimming and end treatment process, and Figure 4 is an illustration of the interior molding. A perspective view of the door trim, which is a product.
FIG. 5 is a partial sectional view taken along the line AA in FIG. 4, and FIG. 6 is a sectional view of the end portion of the interior molded product. 1... Stamping mold, 2... Lower mold, 3...
...Upper mold, 4...Side part of lower mold, 5...Coil, 6...
... Mold surface of upper mold, 7 ... Falling edge, 8 ... Cutting blade, 11 ... Base material, 12 ... Skin material, 13 ...
Epidermis, 14... Cushioning material, 15... Terminal section.

Claims (1)

[Claims] 1. A lower mold in which a coil of an electromagnetic induction heating device is incorporated in the side part, and a falling edge formed at the end of the mold surface corresponding to the lower mold and located outside the side part of the lower mold. Using a mold consisting of an upper mold and a cutting blade made of a ferromagnetic material that is movable with respect to the side of the lower mold, the interior molded product is made of thermoplastic resin material or its composite material. A base material consisting of a thermoplastic resin material and a skin material having a cushioning material attached to the back side of the skin material made of thermoplastic resin are stacked in a heated state and set in the lower mold, and the mold is clamped to combine the base material and the skin material. molding a skin material and thermally bonding the two, and bending the end portions of the base material and skin material at the falling edges of the upper mold and lowering them along the sides of the lower mold;
The interior molded product is characterized in that the cutting blade is then moved toward the side of the lower mold and pressed against the terminal part, and in this state, the terminal part is cut by passing a high-frequency current through the coil. manufacturing method.