JPH06277748A - Manufacture of extruded aluminum material and manufacturing device therefor - Google Patents

Abstract

PURPOSE:To enable press annealing an extruded aluminum alloy material which is susceptible in annealing sensibility by passing a hot extruded aluminum material immediately after hot extruding through cooling water filled in a canister provided to prevent bent of the material. CONSTITUTION:The extruded material 15 extruded from a die 5 is passed through the opening part of cap 11 of the canister 9 to enter in the canister 9 and rapidly cooled with cooling water ejected from an ejecting nozzle 10 and cooling water filled in the canister 9. Following a water flow made by ejected water from the ejecting nozzle and moving of the extruded material 15, cooling water in the canister 9 flows in the extruding direction to be discharged from a discharge port 14 provided on the downstream side of the canister 9. Thus, temperature of cooling water 13 in the canister 9 is always kept low. The hot die 5 is not rapidly cooled to be damaged with back flow of cooling water 13 since the cap 11 is provided on the die 5 side of canister 9 to prevent the back flow of cooling water 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved manufacturing method and manufacturing apparatus for aluminum and aluminum alloy extruded materials.

[0002]

2. Description of the Related Art Extruded materials of aluminum and aluminum alloys are generally subjected to so-called press quenching in which hot-extrusion is followed by rapid cooling for the purpose of improving yield strength in the manufacturing process. Conventionally, press quenching is an air-cooling type in which a fan is blown to an extruded material that is in a high temperature state immediately after hot extrusion processing, a spray type in which a spray is blown, and a quenching tank of the extruded material provided downstream of the hot extruder It is performed by a cooling method such as a water tank type that allows water to pass through.

[0003]

However, among the aluminum alloys used as extruded materials, JIS A2000 series and JIS A7000 series alloys have a slow extrusion rate and are sensitive to quenching. In the formula, since the cooling rate is slow, press quenching cannot be sufficiently performed,
Further, even in the water tank type, sufficient press quenching could not be performed because the extruded material was cooled down by the time it reached the quenching tank. Therefore, these JIS A2000 series and JIS A70
Regarding the extruded material of the 00 series alloy, after hot extrusion, it was reheated for solution treatment, and quenched for quenching treatment. On the other hand, it is conceivable to provide a quenching tank immediately after the die of the hot extrusion apparatus, but this is not preferable because the extrusion apparatus, in particular, the end platen needs to be largely modified.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is a method for improving press-quenching of an aluminum alloy extruded material having a slow extrusion rate and a high quenching sensitivity by improving the conventional apparatus. The purpose is to provide a device. That is, the present invention is a method for manufacturing an aluminum extruded material in which press quenching is performed by water cooling after hot extrusion, in which the aluminum extruded material in a high temperature state immediately after hot extrusion is bent into the end platen of the hot extruder. On the side close to the die in the canister of the hot extrusion machine and the method of manufacturing an aluminum extruded material, which is characterized in that it is water-cooled by passing cooling water filled in the canister provided for prevention, and press-quenched, An apparatus for manufacturing an aluminum extruded material, characterized in that a cooling water injection nozzle is provided, and means for accumulating the cooling water is provided at both end openings of the canister.

[0005]

In the end platen of the extruder, a cylindrical canister is installed to prevent bending of the extruded material. In the present invention, this canister is filled with cooling water, and the water is passed through an extruded material, whereby rapid cooling by water cooling immediately after hot extrusion is realized, the extrusion speed is slow, and the extrusion of an aluminum alloy with a high sensitivity to quenching is realized. Press hardening of the material is possible. The present invention is particularly effective when applied to JIS A2000 series and 7000 series alloys having a low extrusion speed and high sensitivity to quenching, but it is also applicable to other aluminum alloys such as JIS A6000 series. Of course it is possible.

[0006]

EXAMPLES The present invention will be described based on examples. Figure 1
FIG. 3 is a sectional view of an embodiment of the present invention. In FIG. 1, 1 is a container, 2 is a ram, 3 is a billet, 4 is a die ring, 5 is a die, 6 is a backer, 7 is a bolster, 8 is an end platen, 9 is a canister, and 15 is an extruded material. An injection nozzle 10 that injects cooling water 13 is provided on the side of the canister 9 near the die 5, and an injection nozzle 1 is provided at both ends of the canister 9.
Cooling water 13 injected from 0 and filling the canister 9
There are lids 11 and 12 for accumulating in the canister 9. The extruded material 15 extruded from the die 5 passes through the opening of the lid 11 of the canister, enters the canister 9, and is rapidly cooled by the cooling water jetted from the jet nozzle 10 and the cooling water 13 filled in the canister 9. It The cooling water 13 in the canister 9 flows in the extrusion direction (the direction of the arrow in the drawing) along with the movement of the extruded material 15 and the water flow caused by the injection of the cooling water from the injection nozzle 10, and the drain port 14 provided on the downstream side of the canister 9 Drained from. Therefore, the cooling water 13 in the canister 9 is always kept at a low temperature. Also,
Since the lid 11 is provided on the die 5 side of the canister 9 even if the cooling water 13 flows backward (in the direction opposite to the arrow in the figure),
There is no risk of the hot die 5 being rapidly cooled by the backflowing cooling water and being destroyed. Note that the cooling water 13 may be stored in the canister 9 by a so-called air curtain, which blows air strongly instead of the lids 11 and 12.

Next, a billet of JIS A7075 alloy, which has a slow extrusion rate and is sensitive to quenching, is heated at 450 ° C. for 2 hours.
After homogenizing for 4 hours, extrusion temperature 440 ° C, extrusion speed 3
Hot extrusion was performed at a rate of m / min on a flat plate of 5 × 100 mm, and the extruded material was quenched by the following three methods, and the differences in mechanical properties by the quenching methods were compared.

Example: Press quenching with cooling water stored in a canister Comparative example 1: Press quenching by a general press quenching method in which water is cooled by a quenching water tank provided at a position of about 1 m in the extrusion direction from the end platen exit Comparative example 2: After hot extrusion, the extruded material once cooled is heated again, and after being kept at a high temperature (this time it is held at 460 ° C for 30 minutes), it is water-cooled. Quenching by the method used for conventional JIS A2000 series and 7000 series.

The aluminum extruded material quenched by the above three methods was subjected to an artificial aging treatment of holding at 120 ° C. for 24 hours, and then subjected to a tensile test. A JIS No. 5 test piece was used for the tensile test, and the average value of N = 3 is shown in Table 1 as the measurement result.

[0010]

[Table 1]

As is clear from Table 1, the extruded material press-quenched by the method according to the present invention has remarkably excellent mechanical strength as compared with the extruded material press-quenched in a general water tank system, and The mechanical strength was the same as that of the extruded material that was quenched by the method of reheating and water cooling that was conventionally used for JIS A7075 alloy. In addition, the elongation was similar to that of the extruded material that was quenched by the conventional methods of reheating and water cooling.

[0012]

As described above, according to the present invention, even an extruded material of an aluminum alloy having a slow extrusion rate and a high quenching sensitivity can be press-quenched immediately after hot extrusion. Therefore, it is possible to reduce the labor, time, and energy required to reheat and quench the hot extruded material that has once been cooled, and to reduce the cost. Further, since the present invention is a modification of the canister of the conventional extruder, it is not necessary to modify the conventional extruder to a great extent, and it is economical and has significant industrial effects.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of a hot extruder according to the present invention.

[Explanation of symbols]

 1 Container 2 Ram 3 Billet 4 Die Ring 5 Die 6 Backer 7 Bolster 8 End Platen 9 Canister 10 Injection Nozzle 11, 12 Lid 13 Cooling Water 14 Discharge Port 15 Extruded Material

Claims (2)

[Claims] 1. A method of manufacturing an aluminum extruded material in which press quenching is performed by water cooling after hot extrusion, wherein the aluminum extruded material in a high temperature state immediately after hot extrusion is bent into an end platen of the hot extruder. A method for producing an aluminum extruded material, which comprises cooling by cooling water filled in a canister provided for prevention, followed by press hardening. 2. An aluminum extrusion characterized in that a cooling water injection nozzle is provided on the side of the canister of the hot extruder near the die, and means for accumulating the cooling water is provided at both end openings of the canister. Material manufacturing equipment.