JPH0558808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an extrusion processing apparatus used for extrusion processing of aluminum and the like.

In this specification, front and rear are based on the extrusion direction, and front refers to the front in the extrusion direction (right side in Figure 2),
Rear refers to the opposite side. In addition, left and right refer to FIGS. 1 and 4.

Conventional technology and its problems Conventionally, when extruding aluminum etc.,
Due to friction with the extruded material, only the temperature of the bearing surface of the die rose higher than that of the other parts of the die, and the temperature difference between them was about 50 to 100 degrees Celsius. the result,
There was a problem in that the recrystallized structure on the surface of the obtained extruded mold material became coarse, and cracks occurred in the mold material during processing. Additionally, when multiple billets are continuously extruded due to an increase in the temperature of the bearing surface of the die, the thickness of the first extruded material and the last extruded material will vary by approximately 10%, resulting in poor extrusion. There was a problem that the yield was reduced.

An object of the present invention is to provide an extrusion processing apparatus that solves the above problems.

In this specification, the term aluminum includes all aluminum alloys in addition to pure aluminum.

Means for Solving the Problems An extrusion processing apparatus according to the present invention includes a puncher, a die disposed on the rear side of the puncher, an extrusion opening, and a refrigerant passage for cooling the bearing surface provided in place of the extrusion opening. A die plate placed on the rear side of the die, a die ring fitted around the die and the die plate, and provided with a refrigerant passage communicating with the refrigerant passage for cooling the bearing surface, and a die ring that is provided with a refrigerant passage that communicates with the refrigerant passage for cooling the bearing surface. a refrigerant supply pipe, the die is closely fitted in a first component member tightly fitted within the die ring, and a recess formed in a rear surface of the first component member;
The refrigerant passage for cooling the bearing surface is formed between the die and the die plate, or between the second component and the first component.
It is formed between the structural members.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same members and parts are denoted by the same reference numerals throughout all the drawings, and the description thereof will be omitted.

1 to 3, the extraction processing apparatus according to the present invention has a cutter 1, a die 2, and a die plate 3 arranged from the front in the above order, and a die ring 4 fitted around these. , a container (not shown) in front of the die plate 3
is located.

The die 2 has an extrusion opening 5 which is approximately in the shape of an inverted U when viewed from the rear, and has an extrusion opening 5 consisting of a horizontal portion and a vertical portion connected to both left and right ends of the horizontal portion, and an extrusion opening 5 which is connected in front of the extrusion opening 5 and is approximately in an inverted U shape when viewed from the rear. A relief part 6 consisting of a horizontal part and a vertical part connected to both left and right ends of the horizontal part.
It is equipped with Bearing surface cooling coolant passages 7 and 8 are provided in the upper and lower parts of the extrusion opening 5 in the die 2, respectively, to cool the bearing surface. The upper bearing surface cooling refrigerant passage 7 extends straight in the left-right direction, and both ends thereof are open to the outer peripheral surface of the die 2. The lower bearing surface cooling refrigerant passage 8 is crank-shaped when viewed from the rear, and its central portion is curved upward so as to approach the extrusion opening 5. Further, both left and right ends of this passage 8 are open to the outer circumferential surface of the die 2. Such a die 2 is composed of two die constituent members 10 and 11, large and small. The larger first component 10 is tightly fitted into the die ring 4, and is provided with a recess 12 in the center of its rear surface, which is rectangular in shape when viewed from the rear. Further, the first component 10 has a front portion of the relief portion 6 formed therein. The smaller second component 11 has a horizontal rectangular shape when viewed from the rear, and has an extrusion opening 5 and a relief portion 6.
The rear part of the is formed. The second component 11 is tightly fitted into the recess 12 to form the die 2. The bearing surface cooling coolant passages 7 and 8 are formed of grooves formed in the rear surface of the first component member 10 and the rear surface of the second component member 11, respectively. Furthermore, on both upper and lower sides of the extrusion opening 5 in the second die component 11, there are refrigerant blow-off holes that communicate the upper and lower bearing surface cooling refrigerant passages 7 and 8 with the horizontal portion of the relief portion 6 near the rear end. A plurality of numerals 13 and 14 are formed at predetermined intervals in the left-right direction.

The die plate 3 has an extruded material passage 1 that guides the extruded material extruded from the container to the extrusion opening 5.
5 is provided.

The die ring 4 is provided with one refrigerant passage 16 on each side, which communicates the bearing surface cooling refrigerant passages 7 and 8 with a refrigerant supply pipe 19 that supplies refrigerant to the passages 7 and 8. The left and right refrigerant passages 16 are
An arcuate groove 17 is formed on the inner circumferential surface of the die ring 4 and connects the left and right ends of the upper and lower bearing surface cooling refrigerant passages 7 and 8, one end facing each arcuate groove 17 and the other end. It consists of a through hole 18 opened on the outer peripheral surface of the dimming 4. and,
A refrigerant supply pipe 19 is connected to the outer end of the through hole 18 .

In such a configuration, aluminum extruded from inside the container by an extrusion stem (not shown) enters the extrusion opening 5 through the extrusion material passage 15 of the die plate 3, and the mold material is extruded from the front end of the extrusion opening 5. be done. During such extrusion processing, a refrigerant supply pipe 19 is connected from a refrigerant supply device (not shown).
An inert refrigerant such as liquid nitrogen or liquid helium is introduced into the refrigerant passage 16 through the refrigerant passage. This refrigerant flows through the refrigerant passage 16 into the refrigerant passages 7 and 8 for cooling the bearing surfaces, and while the refrigerant passes through these passages 7 and 8, the bearing surface of the extrusion opening 5 is cooled, and the mold material to be extruded (not shown) is cooled. The recrystallized structure on the surface of (omitted) is refined. Further, the refrigerant that has passed through the bearing surface cooling refrigerant passages 7 and 8 is blown out to the vicinity of the rear end of the reroof portion 6 of the die 2 through the blowout holes 13 and 14. If an inert refrigerant such as liquid nitrogen, liquid helium, or liquid argon is used,
This area is made into an inert gas atmosphere, and the surface of the mold material immediately after extrusion is kept in a clean state, so that the oxide film formed on the surface of the mold material becomes thinner, and its surface quality is improved.

Another embodiment of the invention is shown in FIGS. 4 and 5. In Figures 4 and 5,
The die 20 includes a circular extrusion opening 21 when viewed from the rear, and a relief portion 22 continuous to the front of the extrusion opening 21. An annular bearing surface cooling refrigerant passage 23 is provided around the extrusion opening 21 in the die 20 to cool the bearing surface. Such a die 20 is composed of two die constituent members 24 and 25, large and small. A circular recess 26 is provided in the center of the rear surface of the larger first component 24 when viewed from the rear. The smaller second component 25 is circular when viewed from the rear and has an extrusion opening 21 and a relief portion 22 formed therein. The second component 25 is tightly fitted into the recess 26 to form the die 20. The bearing surface cooling refrigerant passage 23 is formed of a groove formed in the outer peripheral surface of the second component 25. Furthermore, in the area around the relief part 22 of the second die component 25, there are provided a pair of refrigerant blow-off holes 27 at predetermined intervals in the circumferential direction, which communicate the bearing surface cooling refrigerant passage 23 and the relief part 22. A plurality of pairs are provided radially apart from each other.
Further, the first die component 24 is provided with two passages 28 each having one end open to the outer circumferential surface and the other end consisting of a through hole connected to the bearing surface cooling refrigerant passage 23 .

The die ring 4 is provided with two refrigerant passages 29 that communicate the bearing surface cooling refrigerant passage 23 and the refrigerant supply pipe 19 that supplies refrigerant to this passage 23. The refrigerant passage 29 communicates with the bearing surface cooling refrigerant passage 23 via the passage 28. This refrigerant passage 29 has an arcuate groove 30 formed on the inner circumferential surface of the die ring 4 and an arcuate groove 30 formed at one end.
0, and the other end is a through hole 31 that is open to the outer peripheral surface of the die ring 4. Each arcuate groove 30 has two passages 2 provided in the first die component 24.
The outer edges of 8 are facing each other. Said arcuate groove 3
0 functions to ensure communication between the passage 28 and the passage 29 even if the die 20 and the die ring 4 are displaced from each other in the circumferential direction when the die 20 is fitted into the die ring 4.

In such a configuration, during extrusion processing, a refrigerant supply pipe 19 is connected from a refrigerant supply device (not shown).
An inert refrigerant such as liquid nitrogen or liquid helium is introduced into the refrigerant passage 29 through the refrigerant passage. This refrigerant flows into the bearing surface cooling refrigerant passage 23 through the refrigerant passage 29 and the passage 28, and while the refrigerant passes through this passage 23, the bearing surface of the extrusion opening 21 is cooled, and the mold material to be extruded (not shown) is cooled. ) The recrystallized structure on the surface is refined. Further, the refrigerant that has passed through the bearing surface cooling refrigerant passage 23 is
7 and is blown out near the rear end of the relief portion 22 of the die 20. If an inert coolant such as liquid nitrogen, liquid helium, or liquid argon is used as a refrigerant, this part will be in an inert gas atmosphere, and the surface of the mold material will be kept in a clean state immediately after extrusion, and an oxide film will be formed. becomes thinner and its surface quality improves.

In the above two embodiments, an inert refrigerant such as liquid nitrogen or liquid helium is used as the refrigerant, and this refrigerant is blown out to a part near the rear end of the relief part, making this part an inert gas atmosphere. As a result, the oxide film formed on the surface of the extruded mold material becomes thinner, and the surface quality of the mold material improves. However, instead of this, water may be used as the refrigerant and this water may be blown out toward the rear end of the relief portion. In this way, a burning effect on the resulting mold material can be obtained. In this case, in order to prevent the die from cracking, it is preferable to arrange a pipe for passing water in the water passage. Further, in the above embodiment, the refrigerant that has entered the bearing surface cooling refrigerant passage is blown out to the relief part, but the refrigerant is not limited to this and passes through the bearing surface cooling refrigerant passage. After that, it may be discharged outside.

Effects of the Invention The extrusion processing apparatus according to the present invention has an extrusion opening 5,
21, and dies 2, 20 having bearing surface cooling refrigerant passages 7, 8, 23 provided around the extrusion openings 5, 21; and a bearing surface cooling refrigerant fitted around the dies 2, 20; A die ring 4 provided with refrigerant passages 16, 29 communicating with the passages 7, 8, 23, and the refrigerant passages 16, 29.
Since the refrigerant supply pipe 19 is provided with a refrigerant supply pipe 19 for supplying refrigerant to the bearing surface, the refrigerant passages 7, 8, 23 for cooling the bearing surface are passed from the refrigerant supply pipe 19 through the refrigerant passages 16, 29 during extrusion processing of aluminum or the like.
When the refrigerant is sent to the bearing surfaces, the bearing surfaces of the extrusion openings 5 and 21 are cooled by the refrigerant passing through the bearing surface cooling refrigerant passages 7, 8, and 23. Therefore, the temperature of the bearing surface is made almost uniform with the temperature of other parts of the dies 2, 20, and as a result, the recrystallized structure of the surface portion of the extruded mold material obtained can be refined, and the mold material This makes it possible to prevent cracks from occurring. Furthermore, even when a plurality of billets are continuously extruded, there is no difference in wall thickness between the first extruded mold material and the last extruded mold material obtained.

Also, refrigerant passages 7, 8, 2 for cooling the bearing surface.
3 is formed between the die 2 and the die plate 3 or between the second component 25 and the first component 24 of the die 20, so that it can be easily formed.

Furthermore, the dies 2 and 20 are connected to the first component 1
0, 24, and a second component 1 which is tightly fitted into the recesses 12, 26 formed on the rear surface of the first component 10, 24 and has extrusion openings 5, 21 formed therein.
1 and 25, if the bearing surface is worn out, only the second component members 11 and 25 need to be replaced, which reduces the cost.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway rear view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the - line in FIG.
3 is a sectional view taken along the - line in FIG. 1, FIG. 4 is a partially cutaway rear view showing another embodiment of the invention, and FIG. 5 is a sectional view taken along the - line in FIG. 4. be. 1...batsuka, 2,20...dice, 3...dice plate, 4...die ring, 5,21...
Extrusion opening, 7, 8, 23... Refrigerant passage for cooling the bearing surface, 10, 24... First component, 11,
25... Second constituent member, 16, 29... Refrigerant passage, 19... Refrigerant supply pipe.

Claims (1)

[Claims] 1 A die 2, 20 having a backer 1, extrusion openings 5, 21, and refrigerant passages 7, 8, 23 for cooling the bearing surface disposed on the rear side of the backer 1 and provided around the extrusion openings 5, 21. and the dice plate 3 arranged on the rear side of the dice 2, 20.
A die ring 4 is fitted around the die plate 3, the die plate 3, and the die ring 4 is provided with coolant passages 16, 29 that are connected to the bearing surface cooling coolant passages 7, 8, 23, and A refrigerant supply pipe 19 for supplying refrigerant to the passages 16, 29, and a first component 10, 24 in which the dies 2, 20 are tightly fitted into the die ring 4; Recess 1 formed on the rear surface of
2, 26 and the extrusion opening 5, 2
1 is formed, and the refrigerant passages 7, 8, 23 for cooling the bearing surface.
is formed between the die 2 and the die plate 3 or between the second component 25 and the first component 24.