JPS5912367B2 - Dies for extruding profiles with extremely high tongue ratios - Google Patents

Description

[Detailed Description of the Invention] Conventionally, in extruded shapes called semi-hollows, shapes with a high ratio (tongue ratio) of the internal space of the shape and the opening (tongue) that divides the space are: Various improvements have been made from the perspective of die life.

For example, (a) a method in which the die is manufactured using a die whose shape is changed so that the die strength of the tongue portion is sufficient, that is, the tongue ratio is lowered, and the shape is returned to its normal shape after extrusion.

(B) A method of attaching crosspieces to make the tongue part hollow, and then cutting off the discarded crosspieces after extrusion.

(c) A method in which a semi-hollow die is used and the tongue portion is covered with a port portion so that extrusion pressure is not directly applied to the tongue portion.

However, with any of these methods, the opening die surface cannot be sufficiently reinforced for shapes with extremely narrow openings (tongues) (approximately 0.3 to 3.0 mm). In many cases, extrusion was impossible, and even if extrusion was possible, the degree of damage to the die was significant, resulting in an unavoidable decrease in productivity and high costs.

This invention solves the above-mentioned drawbacks of the conventional method, and
The purpose of the present invention is to provide a die that makes it possible to extrude a shape having an extremely narrow tongue part of a semi-hollow crosspiece, which has been impossible to extrude up to now, and in which the tongue part and a holding part for holding it are collectively configured. , and the said part is constructed as a mandrel part of the port body, and when a part of the said holding part is assembled as a die body with a hole provided in the same shape as a part of the holding part provided in the die, a snug fit is achieved. According to the present invention, a shaped material having a predetermined shape is formed by
A significant improvement was also achieved in terms of cost.

Next, the present invention will be described with reference to embodiments shown in the accompanying drawings.

In the conventional semi-hollow die method, the shape of the bearing part of the die consists of, for example, the shaded part in FIG. 1 and the part surrounded by continuous lines 11 and 12. In this case, the thinnest tongue part A During extrusion, surface pressure during extrusion directly acts on the sections B and B, which often causes deformation or breakage.

Therefore, in this invention, the shape of the port body is such that the hatched part in FIG. A hole 1'' is formed that has the same shape as the E and F parts, and is surrounded by wires 21 and 22 that connect to the tongue part, and when assembled into a die body, the E and F parts are formed. By inserting it into the hole provided in the die in a state where it is rubbed against the hole provided in the die, the surface pressure during extrusion is prevented from directly acting on the C part or D part, thereby guarding the part, and extruded shape of a predetermined shape. which obtains
In Figures 3 to 8 which show this in more detail,
1 is a die body, 1' is a die, 2 is a back die lined with this die body 1, and 3 is a port body.

The port body 3 is provided with a through hole 5 at a position away from the mandrel portion 3', and the die 1 is also provided with a recess 6 having the same shape as the through hole. On the other hand, the bearing part of the die is formed by the large diameter part of the E part and F part excluding the tongue part, and the line 21 continuous thereto.
, 22, and the holes are formed in the same shape as the E section and F section that are commonly provided for the port body and the die when the die body and the port body are assembled to form a die body. This is done through the fitting part 7 between the shaped hole part and the molded hole part.

Note that the shape of the holding portion is not limited to that described above, and the number of slotted portions is not limited to two.

As described above, by making the above-mentioned parts C and D together with the holding part the mandrel part of the port body, it is completely avoided that the blood pressure force at the time of extrusion acts directly on the parts C and D. This made it possible to prevent deformation and breakage of portions C and D.

According to the method of this invention, as shown in FIG. 8, it is possible to extrude a profile 8 with a tong opening size of about 0.3 to 3.0 mm at an extremely high tong ratio, which was previously impossible to extrude.
Moreover, it can be provided at a low cost.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing the principles of the conventional method and the method of the present invention, FIG. 3 is a front view of the apparatus used in the method of the present invention, and FIGS. 4 to 5 and 7 is a cross-sectional view taken along lines IV-IV, ■-■, and ■-■ in FIG. 3, respectively, and FIGS. 6 a to f are front views and plane views in which each component of the die body of the present invention is divided. 8 are diagrams showing an example of a shape extruded by the method of the present invention. In the figure, 1...Dice body, 1'...
...Die, 1"...Die bearing shape,
2... Back die, 3... Port body,
3'... Mandrel part, 4... Tong part, 5... Through hole (of port body 3), 6...
. . . Hole (of die 1), 7 . . . Grinding portion.

Claims (1)

[Claims] 1. A die for extrusion molding of a profile having an extremely high tongue ratio, characterized in that the tongue part is reinforced by providing a fitting part between the port body and the die at a position away from the tongue part.