JPH0446655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a die for extrusion molding of extruded profiles with high fins, and in particular to a die used for the production of extruded profiles of aluminum or aluminum alloys.

2. Description of the Related Art In general, an extruded molded material having tall fins, as shown in FIG. 5, for example, has thin, tall fins arranged in parallel on both sides of a thick molded material main body 1a.

Conventionally, as shown in FIGS. 9 to 12, for example, a die for manufacturing such a shaped material 1 has a die body 53 provided with a large number of thin convex portions 56 that protrude long into the opening 55. As a result, in the opening 55, a narrow hole 55a for forming the thin and tall fin 2 and a remaining wide hole 55b for forming the thick-walled mold body 1a are formed. . During the extrusion process, the heated billet of aluminum or the like forms a narrow hole 55a and a wide hole 55.
A rectifying plate 51 having billet inflow holes 52 is connected to the die body 5 so that the billet flows into the die body 5 at a uniform speed.
It is arranged on the billet inflow side of No. 3, and its billet inflow prevention part 50 is made to look into the wide hole part 55b of the die body 53.

Furthermore, in the case of the die described above, there is a risk that the long and thin convex portion 56 protruding into the opening 55 may be deformed or damaged by the pressing force of the billet, so a die that prevents this is necessary. As shown in Japanese Patent Publication No. 61-60724, the present inventors installed bridges 57 for reinforcing the convex portions on the wall surface of the billet inlet side of the die body 53 so that all the convex portions 5
6 is provided in a state where it straddles the convex portion of the bridge 57, and the connecting portion 5
An extrusion die has been proposed in which the bridge 57 is fitted and fixed into a fitting recess 59 formed on the lower surface of the rectifying plate 51.

Problems to be Solved by the Invention Although the die proposed above was sufficiently effective for the intended purpose, when it was subsequently used in the actual production of mold materials, the following new problems arose: It was found that there is.

That is, due to the existence of the connecting portion 58 that connects the bridge 57 and the convex portion 56, the adjacent connecting portions 58, 5
As shown in FIG.
It has been recognized that there is a problem in that the wall thickness of the fin 2 becomes slightly thinner than the design value at the root portion of the thin-walled fin 2, that is, the portion between the connecting portions 58, 58, resulting in a so-called thin portion 2a. It was done.

The present invention further aims to solve such problems.

Means for Solving the Problems The inventors have solved the above problems by not arranging the connecting parts in a line, but by shifting the positions of adjacent ones from each other. The inventors have discovered that this problem can be solved by smoothing the metal flow, and have arrived at the present invention.

That is, the present invention has a plurality of thin-walled convex portions that protrude long into the opening, and a narrow hole portion for forming a plurality of high fins within the opening by these convex portions, and a thick-walled convex portion. a die body in which a remaining wide hole is formed for forming a shape material body; and a rectifying plate superimposed on the upper surface of the die body and having a plurality of heating billet inflow openings; A bridge for reinforcing the protrusions is provided on the wall surface of the main body on the inflow side of the heating billet, spanning all the protrusions, and this bridge and each protrusion are connected by connecting parts. The die for extruding a shape material is characterized in that the connecting portions are provided in a substantially staggered arrangement between adjacent connecting portions such that the connecting positions are shifted from each other in the height direction of the convex portion. , the gist is a die for forming extrusion materials with high fins.

Embodiments Example 1 This embodiment is an extruded aluminum molded material 1 which is used in a heat sink, for example, as shown in FIG. This relates to an extrusion molding die for manufacturing.

FIG. 2 shows the die body 3. The die main body 3 has a disk shape and has six thin-walled protrusions 5 on the left and right sides that protrude long into the aperture 4, thereby forming seven tall fins 2 on the left and right sides in the aperture 4. A narrow hole 4a for forming a thick-walled mold material body 1a and a remaining wide hole 4b for forming a thick-walled mold body 1a are formed on the wall surface of the die body 3 on the heating billet inflow side. Two shaped protrusion reinforcing bridges 7 are provided in a state where they straddle the left and right protrusions 5 and are parallel to each other. The parts are connected to each other by a connecting part 8, and a gap 9 for joining the heated billets is provided between adjacent connecting parts 8. In addition, each bridge 7 has a leg 7b integrally provided at both ends, whose tips are joined to the die wall surface 6 by welding, and a connecting portion 8 integrally provided at a portion of the bridge 7 facing the convex portion. Each tip is joined to a portion of the convex portion 5 near the tip by welding.

Moreover, as shown in FIG. 2, the intermediate portion 7a of the bridge 7 that straddles the convex portion 5 is formed in a meandering shape, so that the connecting portions 8 are not lined up in a straight line, and the adjacent connecting portions 8 They are arranged in a staggered manner by sequentially shifting their positions. As a result, the heating billet merging gap 9 between the connecting portions 8, 8 is substantially enlarged, and the metal flow can be made smoother.

FIG. 3 shows a rectifier plate 11 combined with the die 3, which has a disc-shaped rectifier body 11a with four holes 13 larger than the holes 4 of the die body 3. , an H-shaped heating billet inflow prevention part 12 is provided in the center when viewed from above, and an opening 13 for heating billet inflow is provided in the lower surface.
A communicating part 15 is provided to communicate with each other, and a convex reinforcing bridge that opens toward the die body 3 is fitted to the upper wall 16 of this communicating part 15, that is, the lower wall of the left and right side parts 12a of the H-shaped blocking part 12. Concave part 14
are provided in the length direction of both side portions 12a.

1 and 5 show a state in which the die body 3 and the rectifying plate 11 are combined. The rectifying plate 11 is arranged on the billet inflow side of the die body 3, and the H-shaped billet inflow side The left and right side parts 12a of the blocking part 12 are fitted over the bridges 7 on both the left and right sides of the die main body 3, so that each bridge 7 is fitted into the recess 14, and the center part 12b of the billet inflow blocking part 12 is fitted over the bridges 7 on both the left and right sides of the die main body 3. It is looked into the wide hole 4b in the opening 4 of No.3.

When the heated aluminum billet is extruded in the container of the extruder, as shown in the figure, the flow of the heated billet is first dispersed by the H-shaped inflow prevention part 12 of the rectifying plate 11. It flows into the opening 13 of the current plate 11, and then the narrow hole 4a and the wide hole 4b of the opening 4 of the die 3.
It flows into. At this time, the heating billets on both sides of the left and right convex reinforcing bridges 7 flow into the gap 9 between the connecting parts 8 arranged in a staggered manner and merge with each other, and further into the narrow gap 9 between the convex parts 5. Flows into 9. At this time, since each convex portion 5 is connected to the bridge 7 via the connecting portion 8, the convex portion 5 may be damaged by the pressing force of the heating billet.
This can prevent situations such as bending. In addition, both the left and right bridges 7 each have a rectifying plate 11.
Since the bridge 7 and the connecting portion 8 are fitted into the recess 14, it is possible to reliably prevent the bridge 7 and the connecting portion 8 from falling sideways.

In the above embodiment, the leg portions 7b and the connecting portions 8, which are integrally provided on each bridge 7, are respectively joined to the wall surface of the die body 3 and the convex portion 5 by welding. However, the entire die body 3, that is, the convex portion 5 and the bridge 7
and the connecting portion 8 may be manufactured by integral molding.

Embodiment 2 FIG. 7 shows a second embodiment of the present invention. The difference from the first embodiment is that the die body 23 has the opening 4 of the die body 3 of the first embodiment. A bridge 27 is formed with an opening 24 having a shape approximately half of that of
The point is that only one is provided.

The other points of this second embodiment are almost the same as those of the first embodiment, and in the drawings, the numbers in the ones place are the same and the numbers in the tens place are all "2". The symbol is given as follows.

Embodiment 3 FIG. 8 shows a third embodiment of the present invention, which differs from the first embodiment described above in that the thick-walled part of the die body 33 is A wide hole 34b for forming the fins 1a is formed in a circular shape when viewed from a plane, and a narrow hole 34 for forming a large number of high fins 2 radially from the wide hole 34b.
a is formed, and a bridge 37 is formed in an annular shape straddling all the convex parts 35, and this convex is formed by a connecting part 38 that changes the distance to the center of the aperture 34 between adjacent ones. 35. The bridge 37 is integrated with the die main body 33 by a support portion 37c with legs 37b extending radially in all directions from its outer periphery.

The other points of this third embodiment are almost the same as those of the above-mentioned first embodiment, and corresponding parts in the drawings have the same numbers in the ones place and all numbers in the tens place as "3". The sign is shown.

The present invention is applicable not only to the production of the extruded material 1 having the shape shown in each of the above embodiments, but also to the production of extruded material 1 of various shapes having high fins.

Effects of the Invention In the present invention, in a molding die for producing an extruded material having high fins as described above, a thin-walled convex portion that protrudes long into the opening of the die body is connected to a convex portion reinforcing bridge and a connecting portion. Since the dies are connected by the dies, they can withstand long-term use without deformation or damage to the convex parts, and have an excellent service life. , the connecting parts are not aligned with each other in a straight line but are arranged in a substantially staggered manner with the connecting positions of adjacent ones being shifted from each other, so that the distance between the connecting parts is At 〓, the metal flow of the heated billet is carried out smoothly without being hindered. For this reason,
This eliminates the drawback that the base portion of the fin with a high profile material, that is, the corresponding portion between adjacent connecting portions, becomes thinner, which is the case with conventional dies, and the fin can be accurately molded to the designed dimensions. Therefore, it is possible to manufacture extruded shapes with even greater dimensional accuracy, and since there is no need to allow for thinning allowance in advance at the base of the fin, it is also possible to reduce the thickness of the entire fin, which improves the shape of the shape product. This has the effect of contributing to a reduction in material costs.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a die assembly according to a first embodiment of the present invention taken along the line in FIG. 2; FIG. 2 is a plan view of the die body;
Figure 3 is a plan view of the same current plate, Figure 4 is Figure 1-
5 is a cross-sectional view of an extruded material with tall fins manufactured using the die of the first embodiment, and FIG. 6 is an enlarged sectional view showing thinning at the base of the fins. , FIG. 7 is a plan view of the die of the second embodiment, FIG. 8 is a plan view of the die of the third embodiment, and FIGS. 9 to 12 show conventional dies. is the top view of the die body,
FIG. 10 is a plan view of the rectifying plate, FIG. 11 is a sectional view taken along the convex reinforcing bridge portion in their combined state, and FIG. 12 is a sectional view taken along line XII-XII in FIG. 11. 1... Extruded mold material, 1a... Shape material main body, 2... Fin,
3, 23, 33...Dice body, 4,, 24, 34
...Opening hole, 5, 25, 35...Protrusion, 7, 27, 37
... Convex reinforcement bridge, 8, 28, 38... Connection part,
11... Current plate, 14... Bridge fitting recess.

Claims (1)

[Scope of Claims] 1. A narrow hole having a plurality of long protruding thin convex portions within the aperture and forming a plurality of high fins within the aperture by these convex portions; A die body in which a remaining wide hole for forming a meat shape body is formed, and a rectifying plate superimposed on the upper surface of the die body and having a plurality of openings for inflowing the heated billet; A bridge for reinforcing the convex portion is provided on the wall surface of the die body on the inflow side of the heating billet so as to straddle all the convex portions, and this bridge and each convex portion each have a high fin connected by a connecting portion. The extrusion die for extrusion-shaped materials is characterized in that the connecting portions are provided in a substantially staggered arrangement between adjacent connecting portions so that the connecting positions are shifted from each other in the height direction of the convex portion. do,
A die for forming extruded materials with high fins.