JPH0422509A - Manufacture of aluminum special shaped extruded material - Google Patents

Abstract

PURPOSE:To unify the structure of the thick part and thin part of an extruded material which is extruded by performing extrusion using a die on which discharging holes for adjusting structure of the above-mentioned thin part are provided in the vicinity of the forming holes for thin part as an extruding die. CONSTITUTION:An aluminum material to be extruded is simultaneously extruded from two forming holes 2, 2 and three discharging holes 3, 3, 3. A part of the material to be extruded which flows into the forming holes 22 for thin part concentrically is relieved by being extruded from the discharging holes 3, 3, 3 which are present in the vicinity of the forming holes 22 for thin part. Thus, it is mitigated that the material to be extruded is made to concentrate to the forming holes 22 for thin part. Then, the state of structure of the thick part 101 and also thin part 102 of the extruded material 100 which is extruded through each of the forming holes 21, 22 for thick part and thin part is approximated and strength difference between them is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method for manufacturing aluminum profile extrusions having thick and thin wall sections.

In this specification, the term aluminum is used to include its alloys.

BACKGROUND OF THE INVENTION A profiled aluminum profile having thick and thin sections, for example a rectangular profile (100) shown in FIG. 2, such as a valve plate for a ship, is manufactured by extrusion. things are being done. In this case, in order to improve the dimensional accuracy of the extruded material, it is common practice to stretch the extruded material after extrusion.

6000 series alloys such as 6063, which have excellent extrudability, are often used as materials for the aluminum extrusion sections mentioned above, but recently 2000 series, 5000 series, and 700 series alloys are used.
There is also an increasing demand for deformed extruded sections made of high-strength aluminum such as 0-series aluminum.

Problem to be Solved by the Invention However, especially when such high-strength aluminum is used, if it is stretched after extrusion, a curved shape with the thick part (101) on the inside and the thin part (102) on the outside is created. This has the disadvantage that the desired dimensional accuracy cannot be obtained. Moreover, this bending increased as the amount of stretching increased.

This invention was made to eliminate such drawbacks, and even when extruded materials are made of high-strength alloys such as 2000 series as well as 6000 series alloys, bending after stretching is prevented. The purpose of the present invention is to provide a method for manufacturing aluminum profile extrusions with high shape accuracy.

Means for Solving the Problems For the above purpose, the inventor has conducted extensive research and discovered that the cause of bending of high-strength alloys after stretching is due to the difference in strength between thick and thin parts. . That is, due to the non-uniformity of the metal flow of the extruded material passing through the forming hole for the thick part and the forming hole for the thin part of the extrusion die, a difference in structure occurs between the thick part and the thin part of the profile. It was found that this causes a difference in strength, which in turn causes bending after stretching.

Based on this knowledge, the inventor conducted further research in order to equalize the metal flow of the extruded material passing through the thick-walled and thin-walled holes of the die, and to eliminate the structural differences in the extruded material. As a result of these efforts, the present invention was completed.

That is, in the present invention, when extruding an aluminum profile (100) having a thick wall portion (101) and a thin wall portion (102), an extrusion die (1) is used.
A method for producing an aluminum profile extruded material, characterized in that extrusion is carried out using a die in which a hole (3) for adjusting the structure of the thin wall part is provided near the forming hole (22) for the thin wall part. This is a summary.

During active extrusion, a part of the extruded material that concentrates near the forming hole (22) for the thin-walled part of the die escapes through the waste hole (3). For this reason, the metal flow passing through the forming hole (22) for the thin-walled part and the forming hole (22) for the thick-walled part, which has a relatively large area,
The metal flow passing through the thick part (101,
The difference in strength between the thin wall portion (102) and the thin wall portion (102) is eliminated, and the occurrence of bending after stretching is suppressed.

Embodiment Next, the present invention will be applied to a thick part (101) as shown in FIG.
) and a thin-walled portion (102), an example will be explained based on an example in which a profiled aluminum extrusion (100) having a cross-sectional shape is manufactured.

In this example, extrusion is performed using a solid die (1) shown in FIG. The die (1) has a forming hole (2) (2) and a waste hole (3) having a shape corresponding to the cross section of the section. In this embodiment, two molding holes are arranged at symmetrical positions to simultaneously produce two extruded materials to improve efficiency. Moreover, each molding hole (2) has a thick-walled part molding hole (21) for forming a thick-walled part (101), and a thin-walled part (102).
) for forming a thin-walled part forming hole (22). On the other hand, the holes (3) are formed holes (22) for each thin wall part.
Three pieces of the same shape and size are provided on both sides of (22), sharing the center hole. Such a hole (3
) is provided with the intention of making the metal flow passing through the thin-walled forming hole (22) uniform with the metal flow passing through the thick-walled forming hole (21) during extrusion. In view of this effect, the position of the waste hole (3) should be as close as possible to the forming hole (22) for the thin section without causing damage to the die.
It is desirable that the area of the cut hole (3) is 1/2 to 3/3 of the area of the thick-walled part forming hole (21).
It is preferable to set the value to about 2. Of course, the hole (
3) is not particularly limited in number or shape;
2), and may be provided in a manner that can eliminate or suppress the difference in structure and strength.

Extrusion is performed using the die described above. Due to the advancement of the stem, the aluminum extrusion material has two forming holes (2)
(2) and three holes (3) (3) (3) at the same time. Therefore, a part of the extruded material flowing into the forming hole (22) for the thin-walled portion in a concentrated manner flows into the waste hole (3) (3) that exists near the forming hole (22) for the thin-walled portion. (3)
I was pushed out and ran away. Therefore, the concentration of the extruded material in the forming hole (22) for thin-walled parts is alleviated compared to the case without the waste hole, and the forming hole (22) for thick-walled parts has a relatively larger area than the forming hole (22) for thin-walled parts. The state is similar to a metal flow flowing into the hole (21). Therefore, the thick part (101) and the thin part (10
The structural state of 2) is also similar, and the difference in strength between them is suppressed.

Note that other conditions for extrusion, such as extrusion temperature and extrusion speed, are not particularly limited, and conditions employed in conventional methods may be appropriately adopted. Furthermore, the shape of the extruded material to which this invention is applied is a deformed material having a thick wall portion and a thin wall portion.
If the difference in thickness between the thick part and the thin part is small, there is no need to wait for the application of the present invention. It is preferable to apply the present invention to the production of extruded materials whose wall thickness is >3.

Incidentally, in order to confirm the effect of the present invention, the die shown in Fig.
Using the same conventional die as the one in the figure, 5083Aρ
The alloy was extruded into an extrudate (H112) shown in FIG. The dimensions of each part of the extruded material are a:15. 3#l#I, b
: 3. l5Sc: 50.7! RIn, d
: 12. It was set to 3m. On the other hand, the dimensions of each part of the die were L1: 13 m, L2: 10 M, L3: 40 rtvn, and the area of each hole: 207. Stretching was performed after extrusion, and the tensile strength of the thick part (101,) and thin part (102) of the extruded material (100) after stretching was investigated, and the results were as shown in Table 1 below.

Table 1 From the results in Table 1 above, it is clear that according to the present invention, the difference in strength between the thick part (101) and the thin part (102) of the profiled extruded material (100) can be suppressed, and therefore bending after stretching can be suppressed. Naturally, I was able to confirm that it was suppressed.

Effects of the Invention As described above, the present invention provides an extrusion die for extruding aluminum profiles having thick and thin parts.
This method is characterized in that extrusion is carried out using a die in which a hole for adjusting the structure of the thin-walled portion is provided in the vicinity of the forming hole for the thin-walled portion, so that when there is no hole for forming the thin-walled portion, the molding hole for the thin-walled portion is A part of the extruded material flowing into the hole can be released into the hole. Therefore, even when using 6000 series AΩ materials as well as other high strength aluminum materials such as 2000 series, 5000 series, and 7000 series, the metal flow of the extruded material passing through the forming holes for thin-walled parts and the relative area Since the metal flow of the extruded material passing through the large thick-walled forming hole can be made uniform, the structures of the thick-walled portion and thin-walled portion of the extruded material can be made uniform. Since the structures are similar in this way, it is possible to eliminate or suppress the difference in tensile strength between the two parts, and as a result, it is possible to produce aluminum profile extruded sections with extremely high shape accuracy that do not bend even when stretched. can.

[Brief explanation of the drawing]

FIG. 1 is a front view of a die used in an embodiment of the present invention, and FIG. 2 is a cross-sectional perspective view of an extruded material manufactured by the die of FIG. 1. (1)...Dice, (2)...Molding hole (21)...
- Molding hole for thick wall part, (22)... Molding hole for thin wall part, (
3)...Subhole, (100)...Extruded material, (101'
)...thick wall part, (102)... thin wall part. that's all

Claims (1)

[Claims] When extruding an aluminum profile (100) having a thick wall portion (101) and a thin wall portion (102), an extrusion die (
As 1), manufacturing an aluminum profile extruded material, characterized in that extrusion is carried out using a die in which a hole (3) for adjusting the structure of the thin wall part is provided near the forming hole (22) for the thin wall part. Method.