JP7267072B2 - Manufacturing method and equipment for aluminum alloy parts - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing an aluminum alloy part by subjecting a heat-treated aluminum alloy extruded material to plastic working, and a manufacturing facility suitable for carrying out the method.

In recent years, with the tightening of standards for automobile collision safety and pedestrian protection, there is a demand for higher strength automobile parts such as collision protection members (bumper reinforcement, etc.) and body frames. On the other hand, there is a demand for weight reduction of automobile parts in order to improve maneuverability and fuel efficiency. For this reason, heat-treated aluminum alloy extruded materials are used as materials for these automobile parts in order to achieve both high strength and light weight. Plastic processing such as crushing may be applied.

An example of a manufacturing method and manufacturing equipment for a conventional aluminum alloy member (for example, assuming a bumper reinforcement) will be described in order of steps with reference to the schematic diagram of FIG.
(1) Hot Extrusion An aluminum alloy billet 2 heated to a temperature at which extrusion processing is possible is placed in a container 3 of an extrusion press device 1 , and the stem 4 is advanced to push it forward through a die 5 . 6000 series or 7000 series heat-treated aluminum alloys are often used as materials for automobile aluminum alloy parts (collision protection members, body frames, etc.).
(2) Cooling The extruded material 6 extruded from the extrusion press device 1 moves on the table 7, and is cooled and quenched by the cooling device 8 (fan air cooling or water cooling device). Cooling of the extruded material 6 starts immediately after extrusion (around 0.5 to 1.5 m from the exit of the die 5). In heat treatable aluminum alloys, the quenching susceptibility generally increases as the alloy content increases and the strength increases, so rapid cooling is required.
The cooled extruded material 6 is stocked on the table 7 . Also, the extruded material 6 may be transferred from the table 7 to another storage location.

(3) Stretch The length of the extruded material 6 is generally as long as 30 to 50 m. The extruded material 6 is stretched and straightened by a stretcher (not shown) before being cut.
(4) Cutting A long extruded material 6 is sent to a fixed cutting machine (only a circular saw 9 as a cutting tool is shown) and cut to a predetermined length (a length corresponding to one aluminum alloy part). . The cut extruded materials are grouped into lots and conveyed to a plastic working device (including a bending press and a crushing press).
(5) Bending In the case of bumper reinforcement, both ends are often bent. The stretching can be omitted when the tensile bending process is performed.

(6) Softening heat treatment When applying a large plastic strain to the extruded material, such as crushing the ends, solution heat treatment or restoration treatment (see Patent Document 1) is performed as necessary to prevent cracking during processing. , to cancel hardening due to natural aging.
(7) Crushing processing For design necessity and prevention of interference with other parts, a partial region in the length direction of the extruded material is crushed to change the cross-sectional shape of the same region. Instead of performing the softening heat treatment, the crushing process may be performed by warm press working or hot press working.
(8) Artificial aging treatment The extruded material (aluminum alloy part) after plastic working is subjected to artificial aging treatment to improve the strength of the material. T5 treatment (ordinary aging treatment) is appropriately selected when emphasizing improvement in strength, and T7 treatment (overaging treatment) when emphasizing avoidance of stress corrosion cracking.

Japanese Patent No. 5671422

6000 series and 7000 series aluminum alloy extruded materials are generally used as materials for aluminum alloy parts (collision protection members, body frames, etc.). These heat-treated aluminum alloys undergo natural aging with the passage of time after extrusion, increasing their strength and decreasing their elongation. In the conventional manufacturing process, after extruding a long extruded material of about 30 to 50 m, it is stocked on a table or in another storage place, and after a considerable period of time, the extruded material is cut to a predetermined length (one aluminum alloy The extruded material is cut into lengths corresponding to the parts to be manufactured, and the cut extruded materials are grouped into lots and sent to a plastic working device for plastic working. For this reason, when plastic working such as bending, crushing, shearing (piercing, etc.), burring, swaging, and other press forming is performed on the extruded material, natural aging progresses and the elongation of the material decreases, When subjected to plastic working that involves large deformation, there is a problem that the extruded material is broken or cracked. In addition, there is also the problem that the amount of springback varies due to the incremental difference in material proof stress caused by the difference in progress of natural aging, and the dimensional accuracy deteriorates. These problems are more likely to occur when the aluminum alloy is a high-strength material.

In order to solve the above problems, it is necessary to cancel the hardening due to natural aging, reduce the yield strength of the extruded material, and increase the elongation before subjecting the extruded material to plastic working. In order to cancel the hardening of the extruded material due to natural aging, it is possible to perform solution treatment or restoration treatment as described above, but in these methods, the extruded material is reheated and cooled immediately before plastic working. Therefore, there is a problem of cost increase due to investment in heat treatment equipment and additional man-hours.

In the case of aluminum alloys with high susceptibility to quenching, quenching after extrusion is necessary in order to secure a sufficient amount of hardening by artificial aging treatment. However, for example, in the case of an extruded material having a hollow cross section and one or more inner ribs inside, the temperature drop of the inner ribs that are not directly cooled from the outer periphery is delayed, resulting in insufficient quenching, and the predetermined strength after artificial aging treatment. The problem is that I don't get it. Moreover, there is also a problem that the deformation of the extruded material after cooling becomes large due to the difference in thermal contraction caused by the uneven temperature distribution in the cross section during cooling.

An object of the present invention is to reduce cracking during plastic working at a lower cost than a method including solution treatment or restoration treatment when plastic working is performed on a heat-treated aluminum alloy extruded material to produce an aluminum alloy member. It is to prevent occurrence.
Another object of the present invention is to suppress deformation of the extruded material after cooling when the heat-treated aluminum alloy extruded material has a hollow cross section and has one or more inner ribs inside, and to perform artificial aging treatment of the inner ribs. It is to improve the strength after.

In the method for manufacturing an aluminum alloy part according to the present invention, a heat-treated aluminum alloy is hot extruded by an extrusion press device, and the extruded material extruded from the die and moving forward is cooled, cut into a predetermined length, and cut. The extruded material is then conveyed to a plastic working device, subjected to plastic working before the yield strength of the extruded material exceeds 120 MPa due to natural aging, and then subjected to artificial aging treatment.
In the manufacturing method described above, the extruded material extruded from the die is cooled by natural air cooling or forced cooling (fan air cooling, water cooling) while moving forward. When the extruded material has a hollow cross section and has one or more inner ribs in the cross section, a nozzle is inserted from the front into the cross section of the extruded material that is extruded from the die and moves forward, and the coolant is injected from the nozzle. It is preferable to cool the extruded material also from the inner surface side.

The production equipment for aluminum alloy parts according to the present invention is suitably used for carrying out the above-described production method, and includes an extrusion press device for hot extrusion processing of a heat-treated aluminum alloy, and an extrusion press device on the delivery side of the extrusion press device. and a cutting device for cutting the extruded material to a predetermined length and separating it from the extrusion press device, and a conveying device and a plastic processing device provided together with the extrusion press device, the cutting device extruding the extruded material A cutting tool that moves forward at the same speed as the speed, the conveying device conveys the extruded material cut to a predetermined length by the cutting device to the plastic working device, and the plastic working device conveys the extruded material by the conveying device. The extruded material thus formed is subjected to plastic working to be formed into an aluminum alloy part.
In the above manufacturing facility, a cooling device is preferably arranged on the exit side of the extrusion press. This cooling device forcibly cools (fan air cooling, water cooling) the extruded material that is extruded from the die and moves. If the extrudate is of hollow cross-section and has one or more internal ribs in the cross-section, it preferably includes nozzles for injecting coolant into said cooling device. The nozzle is movable forward and backward along the extrusion direction, is inserted into the inside of the cross section of the extruded material from the front, and can cool the extruded material from the inner surface side.

In the method for manufacturing an aluminum alloy part according to the present invention, the extruded material extruded from the extrusion press and moving forward is cut to a predetermined length on the spot without being stocked on a table or other storage location. It is transported to a plastic working device and plastic working is applied before natural aging progresses (before the proof stress exceeds 120 MPa). Therefore, various plastic workings can be performed while maintaining low yield strength and high elongation without performing solution treatment or restoration treatment before plastic working, and cracks are less likely to occur during plastic working. According to this manufacturing method, it is possible to manufacture high-precision aluminum alloy parts at low cost without the need for solution treatment or restoration treatment, and with low springback due to low yield strength during plastic working. In addition, since residual stress associated with press working can be reduced, stress corrosion cracking resistance can be improved even for high-strength 7000 series aluminum alloy members.

The heat-treated aluminum alloy extruded material extruded from the die is quenched by natural air cooling or forced cooling (fan air cooling, water cooling). When the extruded material has a hollow cross section and has internal ribs in the cross section, by using a nozzle that injects a coolant as a cooling means, the extruded material is cooled not only from the outside but also from the inside of the cross section, and the cooling process The temperature difference across the entire cross section can be reduced. As a result, the deformation of the extruded material due to thermal contraction during cooling is suppressed, the difference in temperature hysteresis within the cross section is reduced, and the material properties after aging treatment are uniform within the cross section. In addition, by using the nozzle together, the cooling rate of the extruded material is increased, and even a high-strength 7000 series aluminum alloy with high quenching sensitivity, such as a high-strength 7000 series aluminum alloy, can be quenched. An increase can be expected.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining an example of the manufacturing method and manufacturing equipment of aluminum alloy components which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining an example of the manufacturing method and manufacturing equipment of the conventional aluminum alloy components.

An example of the method and equipment for manufacturing aluminum alloy parts according to the present invention will be described below with reference to the schematic diagram of FIG.
The manufacturing facility shown in FIG. 1 includes an extrusion press device 11, a cooling device 12 and a cutting device 13 arranged on the output side of the extrusion press device 11, a conveying device 14 and a plastic working device 15 provided together with the extrusion press device 11. .
The extrusion press device 11 is the same as that of the conventional example, and hot-extrudes the heat-treated aluminum alloy. Examples of heat treatable aluminum alloys include 2000 series, 6000 series, and 7000 series aluminum alloys defined in JIS (Japanese Industrial Standards) or registered in AA (Aluminum Association).

The cooling device 12 consists of at least one of a fan air cooling device and a water cooling device, and forcibly cools and hardens the extruded material 17 which is extruded from the die of the extrusion press device 11 and moves forward on the table 16 . The cooling device 12 also includes nozzles 18 that inject a coolant (eg, air or liquid coolant). The nozzle 18 is supported by a support mechanism 19 and is movable forward and backward along the extrusion direction, and its rear end (right end in FIG. 1) is connected to a coolant supply mechanism (not shown). It should be noted that the cooling device 12 does not need to be installed if the heat-treatable aluminum alloy has a low quenching sensitivity and the extruded material 17 can be sufficiently quenched only by natural air cooling. Further, if the extruded material 17 can be sufficiently quenched only by a fan air cooling device or a water cooling device, it is not necessary to install the nozzle 18 .

The cooling device 12 is used when the extruded material 17 cannot be quenched only by natural air cooling. Further, the nozzle 18 is used with the fan air cooling device or the water cooling device as required when the quenching sensitivity of the heat treatable aluminum alloy is high. It is preferably used when it has the above inner ribs. The nozzle 18 is inserted from the front side into the hollow cross-section of the extruded material 17 that is extruded from the die of the extrusion press device 11 and moves forward. It is cooled from the inside, and after the cooling is completed, it is extracted from the inside of the hollow section. In order to uniformly cool the extruded material 17 from the inside of the hollow cross section, the nozzle 18 can be pulled out and inserted into and out of the hollow cross section while injecting the coolant.

In the cooling device 12, the fan air cooling device or the water cooling device and the nozzle 18 are used together to cool both the inside and the outside of the extruded material 17, so that the temperature difference and temperature history difference in the entire cross section of the extruded material 17 during the cooling process can be reduced. can be made smaller. As a result, the deformation of the extruded material 17 due to thermal contraction during cooling is suppressed, and the material properties after the aging treatment are made uniform within the cross section. In addition, the cooling rate of the extruded material 17 is increased, so that the entire cross section including the inner ribs can be quenched even with a high-strength 7000 series aluminum alloy having a high quenching sensitivity. In addition, since a higher cooling rate than before can be achieved, the range of controllable cooling rate is expanded, and the control range of the size and distribution of precipitates in artificial aging treatment is expanded, which increases the strength of the material after aging treatment. improvement and improvement of stress corrosion cracking resistance can be expected.

The cutting device 13 comprises a cutting tool 21 (a circular saw in this example) and a pair of clamping members 22 , 22 . The cutting device 13 also includes a driving mechanism (driving motor) that operates (rotates) the cutting tool 21, a driving mechanism that operates the clamp members 22, 22, and forwardly moving the cutting tool 21 and the clamp members 22, 22 along the extrusion direction. Alternatively, an advance/retreat mechanism (each mechanism is not shown) or the like for moving backward is provided. The cutting tool 21, the clamp members 22, 22 and the respective mechanisms are installed, for example, on the upper part of the table 16. As shown in FIG.
The cutting tool 21 may be another tool such as a chainsaw, for example. The clamp members 22, 22 are arranged in the front-rear direction closest position of the cutting tool 21, and grip the front and rear positions (holding positions) of the cutting position (holding position) of the extruded material 17 extruded from the die and moving forward, and move the extruded material 17 to the cutting tool 21. position relative to The clamp members 22, 22 holding the cutting tool 21 and the extruded material 17 move forward at the same speed as the extrusion speed of the extrusion press device 11 (moving speed of the extruded material 17), and the cutting tool 21 is operated in the process. to cut the extruded material 16. The cut point is set at a position where the cut extruded material 17 (referred to as 17a) has a predetermined length (length corresponding to one aluminum alloy part). This predetermined length is set to be the same as the length along the direction of extrusion of the finally obtained aluminum alloy part, or set slightly larger in consideration of the gripping allowance for stretching.

The clamp members 22, 22 are set to grip the extruded material 17 at a position immediately after extrusion (about 0.5 to 1.5 m forward from the die outlet of the extrusion press 11). Therefore, when the clamp members 22 and 22 grip the extruded material 17, it is highly possible that the cut and gripped portions are in a high temperature state. In order to prevent deformation of the extruded material 17 softened at high temperatures during cutting, at least one of the clamping members 22, 22 or the cutting tool 21 has a cooling means (air cooling or water cooling).
The cooling of the extruded material 17 by the cooling device 12 is performed in parallel with the cutting of the extruded material 17 by the cutting device 13 . However, the cooling by the cooling device 12 and the cutting by the cutting device 13 need not be started and ended at the same timing.

In the cutting device 13, the pair of clamp members 22, 22, the driving mechanism for operating the clamp members 22, 22, and the advancing/retreating mechanism for moving the clamp members 22, 22 forward or backward along the extrusion direction may be , as a stretcher for the extruded material 17a after cutting and cooling. By gripping both ends of the extruded material 17a with the clamp members 22, 22 and widening the distance between the clamp members 22, 22, the cut extruded material 17a can be stretched and straightened.
Instead of having the cutting device 13 function as a stretcher, a dedicated stretcher 23 may be arranged near the cutting device 13 as necessary to stretch and straighten the extruded material 17a after cutting. Further, when tension bending is performed in the plastic working device 15 described later, since tension correction is performed on the extruded material 17a in the process of tension bending, prior tension correction by the clamp members 22, 22 or the stretcher 23 is unnecessary. .

As described above, the extruded material 17 immediately after being extruded is cut to a predetermined length, and cooling and cutting are performed in parallel, thereby eliminating the need for a conventional huge table 7 (see FIG. 2). A length of 10 m or less in the front-rear direction of the table 16 shown in FIG. 1 is sufficient. In addition, since the extruded material 17a after cutting is generally short (5 m or less at maximum), the floor area of the manufacturing equipment can be reduced even if the conveying device 14 and the plastic working device 15 are included.

The conveying device 14 grips the cut extruded material 17 a and conveys it toward the plastic working device 15 . As described above, since the extruded material 17a is generally short, a robot arm equipped with a gripper, for example, can be used as shown in FIG.

The plastic working device 15 coldly performs one or more types of plastic working such as bending, crushing, shearing (for example, punching), burring, swaging, and other press forming to the extruded material 17a. In the plastic working device 15, necessary pressing devices and the like are arranged corresponding to the type of aluminum alloy parts (the type of plastic working to be applied to the extruded material 17a). When the aluminum alloy part is, for example, a bumper reinforcement, and both ends of the extruded material 17a are subjected to bending and then a part of the longitudinal direction is subjected to crushing, the plastic working device 15 includes a bending press and a crushing press. be

The extruded material 17 (17a) made of a heat-treated aluminum alloy begins natural aging immediately after cooling, and the yield strength gradually increases with the passage of time. be completed before it increases beyond According to the manufacturing method and manufacturing equipment shown in FIG. 1, the extruded material 17 that is extruded from the extrusion press device 11 and moves forward is made into a predetermined length on the spot without being stocked on a table or other storage place. It is cut and conveyed to the plastic working device 15 by the conveying device 14 . Therefore, the extruded material 17a can be subjected to plastic working in a short time after cooling (before the proof stress exceeds 120 MPa). Therefore, reheating treatments such as solution treatment and restoration treatment, which are conventionally performed before plastic working, are not performed.

The extruded material 17a, which has not undergone much natural aging, has a small proof stress during plastic working and a large elongation, so even when severe plastic working (for example, crushing) is applied, the occurrence of breakage and cracking is suppressed. The amount of springback is small, and high-precision aluminum alloy parts can be manufactured. Furthermore, since the yield strength during plastic working is small, the residual stress applied to the extruded material 17a (aluminum alloy part) due to plastic working can be reduced, and stress corrosion cracking resistance can be improved. The proof stress of 120 MPa during plastic working is a numerical value that serves as a standard for the above effects to occur (see Patent Document 1).

In the above plastic working, in order to more reliably prevent breakage and cracking, a press die equipped with a heating device is used to perform warm press working or hot press working in a temperature range of, for example, 150 to 300 ° C. can also In this case, the extrusion temperature of the extruded material 17 and the temperature drop of the extruded material 17 (17a) during cutting and conveying immediately after extrusion are controlled to maintain the temperature of the extruded material 17a during plastic working within the above temperature range. Thereby, reheating of the extruded material 17a can be omitted. This warm press working or hot press working is also performed before the proof stress of the extruded material 17a at the press working temperature exceeds 120 MPa.

After the plastic working, the extruded material 17a is artificially aged to form an aluminum alloy part. This artificial aging treatment can be performed on a lot-by-lot basis using a heating furnace. As with conventional materials, T5 treatment (ordinary aging treatment) is used when emphasis is placed on improving strength, and when emphasis is placed on avoiding stress corrosion cracking. T7 treatment (overaging treatment) is selected as appropriate. This heating furnace may be installed on the same floor as part of the manufacturing facility shown in FIG. 1, or may be installed at another appropriate location.

As the aluminum alloy extruded material, which is the raw material for the aluminum alloy part according to the present invention, a high-strength 7000 series aluminum alloy extruded material, which is susceptible to stress corrosion cracking, can be preferably used, although not limited thereto. A preferred composition of the 7000 series aluminum alloy is, for example, Zn: 3-8% by mass, Mg: 0.4-2.5% by mass, Cu: 0.05-2.0% by mass, Ti: 0.005-0. 2% by mass, and further contains one or more of Mn: 0.01 to 0.5% by mass, Cr: 0.01 to 0.3% by mass, and Zr: 0.01 to 0.3% by mass. , balance Al and impurities.

In addition, as a preferred composition of the 6000 series aluminum alloy, for example, Mg: 0.35 to 1.1 mass%, Si: 0.2 to 1.3 mass%, Ti: 0.005 to 0.2 mass%, Cu: Any one of 0.15 to 0.7% by mass, Zr: 0.06 to 0.2% by mass, Mn: 0.05 to 0.5% by mass, and Cr: 0.05 to 0.15% by mass A composition containing two or more species and the balance being Al and unavoidable impurities can be mentioned.
In addition, as a preferable composition of the 2000 series aluminum alloy, for example, Si: 1.3% by mass or less, Fe: 1.5% by mass or less, Cu: 1.5 to 6.8% by mass, Mn: 1.2% by mass or less , Mg: 1.8% by mass or less, Cr: 0.10% by mass or less, Zn: 0.50% by mass or less, Ti: 0.20% by mass or less, the balance: Al and unavoidable impurities can be done.

INDUSTRIAL APPLICABILITY The present invention is suitably used for manufacturing aluminum alloy parts for collision protection members (energy absorbing members) and body frames of passenger cars, light cars, trucks and the like. Collision protection member parts include, for example, bumper reinforcements, door beams, crash boxes (bumper stays), stay-integrated bumper reinforcements, pedestrian leg protection parts, and underrun protectors. Body frame parts include, for example, front and rear side members, radiator supports, front upper members, roof rails, front and rear headers, rockers, floor cross members, and the like.
The present invention can also be used to manufacture body frame parts for motorcycles and bicycles, and other aluminum alloy parts.

11 Extrusion press device 12 Cooling device 13 Cutting device 14 Conveying device 15 Plastic working device 16 Tables 17, 17a Extruded material 18 Cooling nozzle 21 Cutting tool (circular saw)
22 clamp member

Claims (14)

A 7000 series or 2000 series aluminum alloy is hot-extruded by an extrusion press device, the extruded material extruded from the die and moving forward is cooled and cut to a predetermined length, and the cut extruded material is directed to a plastic working device. A method of producing an aluminum alloy part, characterized in that the extruded material is conveyed by means of a squeegee, subjected to plastic working before the proof stress of the extruded material exceeds 120 MPa due to natural aging, and then artificially aged to the extruded material. 2. The method of manufacturing an aluminum alloy part according to claim 1, wherein the extruded material extruded from the die and moving forward is air-cooled or water-cooled and quenched. 2. When the extruded material has a hollow cross section, a nozzle is inserted from the front into the cross section of the extruded material that is extruded from the die and moves forward, and the cooling medium is injected from the nozzle to cool the extruded material. 2. The method for manufacturing the aluminum alloy part described in 2 above. 4. The method for manufacturing an aluminum alloy part according to claim 1, wherein the extruded material is cooled before and after the cut portion by clamping before and after the cut portion during cutting. The aluminum alloy part according to any one of claims 1 to 4, wherein after the extruded material is cut to a predetermined length, the extruded material is subjected to cold tension straightening before being subjected to plastic working. Production method. An extrusion press device for hot extrusion processing of a 7000 series or 2000 series aluminum alloy , a cutting device disposed on the delivery side of the extrusion press device, for cutting the extruded material to a predetermined length and separating it from the extrusion press device, Consisting of a conveying device and a plastic working device installed together with an extrusion press device, the cutting device includes a cutting tool that moves forward at the same speed as the extrusion speed of the extruded material, and the conveying device cuts a predetermined length by the cutting device. The extruded material cut into pieces is conveyed to the plastic working device, and the plastic working device performs plastic working on the extruded material conveyed by the conveying device to form an aluminum alloy part. Parts manufacturing equipment. 7. The equipment for manufacturing aluminum alloy parts according to claim 6, wherein a cooling device is arranged on the exit side of said extrusion press device . 8. The equipment for manufacturing aluminum alloy parts according to claim 7, wherein the cooling device has a nozzle for injecting a coolant, and the nozzle can move back and forth along the extrusion direction of the extruded material. Claims 6 to 8, wherein the cutting device comprises a pair of clamping members arranged in close proximity to the front and rear sides of the cutting tool, gripping the extruded material and moving forward in synchronism with the cutting tool. Equipment for manufacturing aluminum alloy parts described in any of 10. The equipment for manufacturing aluminum alloy parts according to claim 9, wherein at least one of the cutting tool and the pair of clamp members has a cooling mechanism for cooling the extruded material. The cutting device has the function of a stretcher that stretches and straightens the cut extruded material, grips the front and rear ends of the extruded material with the pair of clamp members, and widens the distance between the pair of clamp members and the extruded material. 11. The equipment for manufacturing aluminum alloy parts according to claim 9 or 10, wherein the tensile straightening is performed. Manufacture of aluminum alloy parts according to any one of claims 6 to 10, characterized in that a stretcher is provided on the exit side of the extrusion press device, and the stretcher stretches and straightens the cut extruded material. Facility. The heat-treated aluminum alloy is hot extruded by an extrusion press, the extruded material extruded from the die and moving forward is cooled and cut to a predetermined length, and the extruded material after cutting is conveyed to the plastic working device. A method of manufacturing aluminum alloy parts in which plastic working is performed before the yield strength of the extruded material increases to exceed 120 MPa due to natural aging, and then aging treatment is performed on the extruded material. Before the extruded material after being cut is subjected to the plastic working, the front and rear ends of the extruded material are clamped by the pair of clamp members, and the extruded material is clamped by the pair of clamp members. A method of manufacturing an aluminum alloy part, characterized in that the distance between the clamp members is widened and the extruded material is subjected to cold tension straightening. An extrusion press device for hot extrusion processing of a heat-treated aluminum alloy, a cutting device disposed on the output side of the extrusion press device for cutting the extruded material to a predetermined length and separating it from the extrusion press device, and the extrusion press device. The cutting device is equipped with a cutting tool that moves forward at the same speed as the extrusion speed of the extruded material, and the conveying device is cut to a predetermined length by the cutting device. The extruded material is conveyed to the plastic working device, and the plastic working device performs plastic working on the extruded material conveyed by the conveying device to form the aluminum alloy part. A cutting device is provided with a pair of clamp members arranged in the vicinity of the front and rear sides of the cutting tool, gripping the extruded material and moving forward in synchronism with the cutting tool, and clamping the front and rear ends of the extruded material to the pair of clamp members. A manufacturing facility for aluminum alloy parts, wherein the extruded material is stretched and straightened by gripping it with clamping members, widening the distance between the pair of clamping members.

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