JP2536448Y2 - Mold for molding - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding, and more particularly to a mold for forming a hook-shaped projection on the surface of a molded product.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a main part of an example of a conventional mold for molding, and FIG. 4 is a sectional view showing a state in which a molded article is projected from the example of FIG.

A conventional mold for forming a hook-shaped projection on the surface of a molded product has a hook-shaped projection (hook-shaped projection) on the surface of the molded product as shown in FIGS. Knockout pin 11 for forming and insert fitting 17
And a knockout pin 12 for projecting the molded product 16b formed in the cavity 16a from the mold by pressing
By pressing the knockout plates 13 and 14, the molded product 16 b protruding from the upper mold 15 is held by the knockout pin 12, and the molded product 16 b is forcibly deformed so that the hook-shaped projection on the surface of the molded product is knocked out by the knockout pin 11. And the molded product 16b is removed from the mold.

[0004]

In the conventional mold for molding as described above, since a hook-shaped projection is formed on the surface of the molded article by a knockout pin, the molded article is forcibly deformed and removed from the mold. It has to be taken out, so that there is a disadvantage that the strength of the hook-shaped projection cannot be increased. In addition, the molded product can be pushed out of the mold only by the knockout pin that forms the hook-shaped projection, but in this case, the molded product may be damaged or deformed. Further, in a molding die having a knockout pin for pressing the insert metal fitting,
When the hook-shaped protrusion is formed at the tip of the knockout pin,
In some cases, the molded product is held by the knockout pins that press the insert fitting, and the molded product cannot be removed from the mold.

[0005]

The mold for molding according to the present invention has a knockout pin for forming a hook-like projection on the surface of a molded product which can slide vertically, and the amount of sliding in the vertical direction can be reduced. By making the size of the knockout pin for projecting the molded product larger than the size of the molded product, the molded product can be removed from the mold without deforming the molded product. .

That is, the mold for molding according to the present invention comprises an upper die having a cavity on the lower surface, a lower die disposed below the upper die, and a space between the cavity and the lower die. the formed to a first knockout pin molded article by pressing the <br/> Me which causes protruding from the upper mold was the hook-like projections on the surface of the molded article provided with a notch on the side surface of the distal portion A second knockout pin, wherein the second knockout pin is slidable in the vertical direction, and the distance of the second knockout pin is smaller than the amount of the first knockout pin biting into the molded article. It is a big one.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention, and FIG. 2 is a sectional view showing a state in which a molded product is projected from the embodiment of FIG.

In this embodiment, as shown in FIG. 1, an upper die 5 having a cavity 6a on the lower surface, a lower die 8 disposed below the upper die 5, and a hook-like projection on the surface of the molded product. Knockout pin 1 for forming a portion, and knockout pin 2 for pressing insert metal fitting 7 inserted into cavity 6a to project molded product 6b formed by cavity 6a and lower mold 8 from the mold. And a knockout plate 3 holding the knockout pin 1 and the knockout pin 2
And 4.

The knockout pin 1 can slide vertically within the knockout plate 4 within a range of a dimension L. This dimension L is larger than the amount M that the knockout pin 2 cuts into the molded product 6b.

When the molded product 6b is manufactured by using the thus-configured mold, the knockout pin 1 is pushed up by the pressure of the resin injected into the cavity 6a until the knockout pin 1 comes into contact with the knockout plate 3 and is formed. A hook-shaped projection is formed on the product 6b.

As shown in FIG. 2, when the molded product 6b is protruded from the upper mold 5 after the molding is completed, the molded product 6b is pushed down by the knockout pin 1, and the lower surface of the knockout pin 2 becomes the upper surface of the molded product 6b. Position above. As a result, the molded product 6b can be moved in the lateral direction, so that the molded product 6b can be easily separated without being deformed.

[0013]

As described above, according to the present invention, a molding die having a hook-shaped projection formed on its surface can be easily separated from the die without deformation. Therefore, since the molded article is not damaged or deformed, the strength of the hook-shaped projection can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where a molded product is projected from the embodiment of FIG.

FIG. 3 is a cross-sectional view showing a main part of an example of a conventional molding die.

FIG. 4 is a sectional view showing a state where a molded product is projected from the example of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Knockout pin 2 Knockout pin 3 Knockout plate 4 Knockout plate 5 Upper mold 6a Cavity 6b Molded product 7 Insert fitting 8 Lower mold 11 Knockout pin 12 Knockout pin 13 Knockout plate 14 Knockout plate 15 Upper mold 16a Cavity 16b Molding tool 17

Claims (1)

(57) [Scope of request for utility model registration] 1. An upper mold having a cavity provided on a lower surface, a lower mold disposed below the upper mold, and a molded product formed between the cavity and the lower mold by pressing the upper mold. in molding die comprising a first knockout pins for make projects, and a second knockout pin forming the hook-like projections on the sides of the notch provided surface of the molded article of the tip portion from the first The second knockout pin is slidable in the vertical direction, and the distance is set to the first knockout pin.
A mold for molding, wherein the amount of the pin is larger than the amount of the pin cut into the molded article .