JPH05321Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an apparatus for forming wood-based laminated plywood by hot pressing.

<Prior art> For example, as shown in FIGS. 4 to 6, the seat portion 3
A chair 5 is provided in which a backrest 4 and a backrest 4 are integrally formed of laminated wood plywood W. The seat 3 and backrest 4 of this chair 5 are formed with three-dimensional concave curved surfaces.

Such a chair 5 is molded by a hot press shown in FIG. That is, it consists of a lower mold 1 having a three-dimensional concave curved surface 1a and an upper mold 2 having a three-dimensional convex curved surface 2a corresponding to the concave curved surface 1a.As shown in FIG. 7A, the lower mold 1 The plywood W is set on top and the upper die 2 is lowered as shown in FIGS. 7B to D to bend the plywood W.

<Problem to be solved by the invention> In the above device, as shown in FIG. 7B, the tip of the convex curved surface 2a of the upper mold 2 comes into contact with the substantially central portion A of the plywood W, as shown in FIG. is bent into a dogleg shape, and as the upper mold 2 continues to descend further, the concave bending in the width direction (lateral direction) is also strengthened, as shown in FIG. 9 in FIG. 7C. However, at this time, one end of the plywood W still has a substantially straight line S. and,
By the time the upper mold 2 reaches the bottom dead center in FIG. 7D, the end portion of the substantially straight line S has been folded back against the flat surface 1b of the lower mold 1, as shown in FIG.
Incidentally, the product taken out from the mold after the press molding is removed by cutting off unnecessary edges around it.

By the way, when folding back the product shown in FIG. 7D, a crack T may occur at the end portion as shown in FIG. 11, and the product was discarded as a defective product. This is because since the concave curved surface is folded back, an internal stress that tends to spread left and right in the width direction acts, causing the bottom of the concave curved surface to break.

<Means for Solving the Problems> The present invention provides a press forming apparatus that improves the above-mentioned conventional problems. The mold and
In a press-molding mold for plywood made of a wood-based laminate, the mold includes an upper mold having a three-dimensional concave curved surface corresponding to the three-dimensional concave curved surface, and the three-dimensional concave curved surface of the upper mold A clamper that presses one end of the plywood against the flat surface of the lower mold before the convex curved surface of the mold comes into contact with the upper mold is provided on the upper mold so that the clamper can move relative to the vertical movement of the upper mold, and the clamper and the flat surface of the lower mold is anti-slip.

Further, a frame member may be provided on the plane of the lower die to regulate the width direction and the length direction of the plywood.

<Function> With the above structure, the present invention uses a clamper to press one end of the plywood onto the flat surface of the upper mold and clamp it before the convex curved surface of the upper mold comes into contact with the plywood as the upper mold descends. Then, the plywood is press-molded into a three-dimensional concave curved shape. Furthermore, the frame member allows the plywood to be easily set in a fixed position on the upper mold and prevents it from moving during press molding.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIGS. 1 and 2, numeral 1 is a lower die, which has a three-dimensional concave curved surface 1a and a flat portion 1b. Reference numeral 2 denotes an upper mold having a three-dimensional convex curved surface 2a corresponding to the concave curved surface 1a of the lower mold 1.

In the present invention, in the above structure, a clamper 3 corresponding to the flat part 1b of the lower mold 1 is provided on the upper mold 2. This clamper 3 is provided at the lower end of a rod 5 whose axis is in the same direction as the lifting direction of the upper die 2, and the rod 5 is held by a mount 4 fixed to the upper die 2 so as to be movable up and down. The upper end of the rod 5 has a stopper 5a that comes into contact with the upper surface of the mount 4, and a coil spring 6 is provided between the lower surface of the mount 4 and the upper surface of the clamper 3 to bias the clamper 3 in a downward direction. is interposed. The lowering end position of the clamper 3 is set so that the convex curved surface 2a of the upper die 2 is located below the leading edge.

Furthermore, the flat part 1b of the lower mold 1 and the clamper 3
is equipped with anti-slip means. This may be, for example, a needle-like protrusion 8 as shown in FIG. 3, or a member having a large friction coefficient such as a rubber plate may be attached.

In addition to the above configuration, as shown in Figure 3,
It is desirable to provide a frame member 7 made of a widthwise regulating plate 7a and a vertically regulating plate 7b of a wood-based laminated plywood W on the flat part 1b of the lower mold 1.

Next, the operation of the upper machine configuration will be explained. As shown in FIG. 1, a planar plywood W is set on the lower mold 1 at the upper end position of the upper mold 2. In this set of plywood W, if the frame member 7 is provided on the flat part 1b of the lower die 1, one end of the plywood W is controlled by the widthwise regulating plate 7a and the longitudinal regulating plate 7b. can be easily positioned in a fixed position. still,
In FIG. 1, W1 indicates plywood that has been press-formed into a three-dimensional concave curved surface.

After the plywood W is set on the lower mold 1, the upper mold 2 starts its downward movement. The clamper 3 is placed on the flat part 1b of the plywood W before the leading edge of the convex curved surface 2a comes into contact with the plywood W as the upper die 2 moves downward.
Abuts on one end of. In this state, the clamper 3, which had been moving downward in the same manner as the upper mold 2, stops, and as the upper mold 2 continues to move downward, it moves relative to the upper mold 2 and compresses the coil spring 6. Thereby, the clamper 3 firmly presses one end of the plywood W onto the flat part 1b and clamps it in a flat form. At the same time, the convex curved surface 2a is formed by bending the plywood W into a "dog" shape, and as shown in FIG.
b) to form a three-dimensional concave curved surface.

Pressure force is applied to the plywood W during bending and forming, but one end of the plywood W is clamped to the flat part 1b of the lower die 1 by the clamper 3, and the needle-like protrusions 8 etc. are prevented from slipping and restricted in the width direction. Since the plywood W is prevented from moving by the plate 7a, the plywood W is formed into the required three-dimensional concave curved surface without any displacement, and also prevents cracking at one end.

<Effects of the invention> Since the present invention is configured as described above, it has the following effects.

The clamper according to claim (1) firmly clamps one end of the plywood in a flat state on the flat part of the lower mold before the convex curved surface of the upper mold bends the plywood. It is possible to eliminate cracks at one end. In addition, since the product is held down by a clamper, the molded product always remains in the lower mold when the upper mold is raised, resulting in stable release from the mold.

Furthermore, by providing the frame member as described in claim (2), a fixed positioning is obtained when the plywood is set on the lower mold, facilitating the setting operation and preventing the plywood from shifting in the width direction during pressure forming, achieving uniform bending and improving material yield.

In addition, since the above-mentioned cracks do not occur, it has exceptional properties such as improved flexibility in molding design.

[Brief explanation of the drawing]

FIG. 1 is a side view of the device of the present invention, showing the upper mold being raised. Fig. 2 is a side view showing the lowering end of the same mold as above, Fig. 3 is a perspective view of the main part of the present invention, Fig. 4 is a perspective view showing an example of a three-dimensional concave curved molded product, Fig. 5
The figure is a sectional view taken along the line V-V in Figure 4, and Figure 6 is a cross-sectional view taken along the line V-V in Figure 4.
7A to 7D are explanatory diagrams of the forming process using the conventional apparatus, FIG. 8 is a perspective view of the forming state of plywood in step B of FIG. 7, and FIG. 9 is a diagram of the forming state of plywood in step C of FIG. A perspective view of the molded state, Figure 10 is the 7th
FIG. 11 is an explanatory diagram showing the folding and bending of one end of the plywood in step D, and FIG. 11 is an explanatory diagram showing cracking of one end of the plywood in step D of FIG. 7. 1... Lower mold, 1a... Three-dimensional concave curved surface, 2...
Upper mold, 2a... three-dimensional convex curved surface, 3... clamper, 4... mount, 5... rod, 5a... stopper, 6... coil spring, 7... frame member, 7a
...Width direction regulation plate, 7b...Vertical direction regulation plate, 8...
...acicular projection, W...plywood.

Claims (1)

[Claims for Utility Model Registration] (1) A lower mold having a three-dimensional concave curved surface and a flat part;
In a press-molding mold for plywood made of wood laminated wood, the mold includes an upper mold having a three-dimensional convex curved surface corresponding to the three-dimensional concave curved surface. A clamper that presses one end of the plywood against the flat surface of the lower mold before the convex curved surface of the mold comes into contact with the upper mold is provided on the upper mold so that the clamper can move relative to the vertical movement of the upper mold, and the clamper and the flat surface of the lower mold is a press-forming machine for wood-based laminated plywood that is non-slip. (2) The press-molding apparatus for wood-based laminated plywood according to claim 1, further comprising a frame member provided on the flat surface of the lower die for regulating the width direction and the length direction of the end portion of the plywood.