JPH09253736A - Bending method for extruded shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute bending for complicated shape with reduced energy cost by continuously executing bending and extruding of an extruded shape so as to improve a production efficiency and to reduce processes from stock to product. SOLUTION: The extruded shape 6 is subjected to bending by a forming die 10 arranged near the outlet of an extruding machine 1. The forming die 10 is arranged with a through hole to form the route of a shape to be bent as a forming guide 11, the extruded shape 6 introduced from the opening is subjected to bending with the route of forming guide from the opening up to the outlet of forming die 10 while being extruded and at high temp. state and remaining relatively soft. The inside of forming die 10 is filled with the extruded shape 6, the extruded shape 6 finished working is cut to a prescribed length by a cutting machine 20 which is actuated while proceeding in synchronization with a moving quantity of the extruded shape 6 and successively entering into next bending. At this time, the forming a die 10 is moved in synchronization with a proceeding speed V0 of the extruded shape 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to bending of an extruded material of aluminum or aluminum alloy.

[0002]

2. Description of the Related Art An aluminum material such as aluminum or an aluminum alloy can be extruded to form a long material into various sectional shapes, such as an I-shaped or H-shaped material.
It can be used in a wide range of fields such as automobiles, railway vehicles, ships or building materials because it can be made into a cross-sectional shape with excellent strength such as a mold or a hollow shape suitable for functions such as forming a fluid passage inside It is used.

Generally, the steps of extrusion and bending are carried out separately. In extrusion, the extruded profile extruded from the extruder is subjected to a tensile load with a stretcher to obtain a straight extruded profile. Then, the product is cut into a certain length to complete a series of steps. In order to perform bending of these long materials, the material is further cut into a length suitable for bending and then subjected to predetermined bending. For this reason, it is necessary to go through many steps until it becomes the final product of bending. Also, since the extrusion process and the bending process are separate in this way,
Bending processing is performed after the extruded shape is extruded and cooled to room temperature and is hardened, so it is difficult to deform and it is difficult to perform bending with a complicated shape. Was required, and the energy required for processing was also large.

Under these circumstances, a method has recently been proposed in which an aluminum extruded shape material extruded from an extruder is bent near the exit of the extruder while still in a high temperature state immediately after extrusion. For example, Japanese Patent Publication 4-6
In the publication No. 450, a fixed mold and a movable mold provided with a passage hole having the same cross-sectional shape as the molding hole of the extrusion mold, which is opposed to the extruder outlet, are arranged. Also, there is disclosed a structure in which an extruded shape member that has passed through a fixed mold by being rotated around an axis is given an arbitrary bending or twisting.

However, in such bending work,
Precise control means for the movable mold according to changes in extrusion speed is required, and it is difficult to correct springback during processing. Regarding the shape of bending that can be processed,
Bending is performed while maintaining the cross-sectional shape of the extruded shape as it is, and it is necessary to separately perform processing such as deforming the cross-sectional shape in the longitudinal direction or changing the expansion angle of the overhanging fins or angle materials. was there.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised to solve such problems, and by bending an aluminum or aluminum alloy extruded profile at a high temperature immediately after extrusion, Making the process from extrusion to bending continuous and consistent, shortening the process and simplifying it, reducing the energy unit cost, and making it possible to easily perform bending of complex shapes. With the goal. In addition, it is possible to perform a process of sequentially changing the cross-sectional shape of the extruded profile in the longitudinal direction of the extruded profile, which was conventionally performed in a separate process, in the bending process.
To facilitate introduction of the extruded shape after extrusion into a forming die for bending and processing with large deformation resistance, and to facilitate the production of a forming die for that purpose, and to facilitate adjustment of the bending degree. To aim.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a forming die, which is a guide for forming a conduction path along a required bending shape, facing an exit of an aluminum material extruder. A method for bending an aluminum extruded profile, characterized in that the extruded profile extruded by the pressing force of the extrusion process is introduced into the mold and is bent in the process of proceeding along the conduction path of the molding guide. The forming die is composed of a forming guide made of a strip material arranged along the processing path and a forming guide fixing tool such as a casing supporting the forming guide, and further fixing the forming guide supporting the forming guide. The tool can adjust its forming guide support angle, in the machining path of the mold,
Applying different cross-sectional shapes from the inlet to the outlet, clamping the tip of the extruded profile, guiding the extruded profile into the mold, and applying tensile force, the mold is extruded. A cutting machine having an opening along the traveling direction of the material, arranging the guide rail of the extruded shape material clamping means along the opening to apply a tensile force, and a cutting machine provided between the extruder outlet and the molding die The feature is that the extruded profile is continuously cut into a predetermined length while moving in synchronization with the extrusion speed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an extruder 1 and a mode of extruding an aluminum material by the extruder 1. The extruder 1 is configured by disposing an extrusion die (die) 3 in an opening at one end of the container 2 and fixing it by a platen 4.
Reference numeral 5 is a billet of a processing material, which is arranged in the extruder and is subjected to an extrusion force P from the other end of the extruder by a stem (not shown) to be extruded from a die having an opening having a predetermined cross-sectional shape to generate a pressing force S Is extruded as the extruded shape member 6.

FIG. 2 shows a state in which the extruded extrusion die material 6 is bent by a forming die 10 arranged near the exit of the extruder 1. As shown in the figure, the molding die 10 is provided with a through hole forming a path of a shape to be bent as a molding guide 11, and the extruded shape material introduced from the opening is extruded and is still in a high temperature state. In the path of the molding guide from the opening of the molding die to the outlet while it is relatively soft, it advances while deforming according to the shape of the path, and bending is performed until it reaches the outlet. During the processing, the extrusion mold material that has been pushed into the molding die by receiving the pushing force S is guided along the path of the processing path and is bent at the bending point. Further, the extruded shape material is sequentially bent at its bending position as it advances along the processing path,
Bending is performed while repeating this deformation until reaching the outlet. Therefore, the bending process is completed in a state where the process reaches the exit through all the steps of the processing path.

The inside of the molding die is filled with the extruded shape material, and the extruded shape material which has been processed is made to have a predetermined length by a cutting machine 20 which operates in synchronization with the amount of movement of the extruded shape material while proceeding in synchronization with each other. It is cut and then goes into the next bending process. At this time, the forming die is also moved synchronously at the advancing speed v ₀ of the extruded profile.
In this state, cutting is performed while moving the cutting machine 20 at a speed v ₁ that is a combination of the moving speed v ₀ of the extrusion die material and the cutting speed.
After cutting, it is retracted at a speed v ₂ and then backed at a speed v ₃ in the direction opposite to the extrusion direction. The forming die is also backed in the same manner, and the extruded shape material that has been processed is removed from the forming die. By repeating this, extrusion and bending can be continuously performed.

As is apparent from this processing step, in the present invention, the processing progresses from the inlet of the forming guide 11 of the forming die 10 to its outlet, and the entire bent formed article is accommodated in the forming die. Since it is regulated in the form described above, it is possible to reduce the influence of springback and the like, improve the product dimensional accuracy, and reduce the variation in accuracy between products.
Further, although the forming guide 11 of the forming die 10 shown in the figure constitutes a path for bending, it does not always come into contact with the extruded material but gives a bending force at a bending position or a bending point, and its function is bending. Since the guide and bending of the extruded mold material are applied at the points, the remaining portion does not necessarily have to be integrated as shown in the figure, although it forms an integral structure as a molding die.

The forming die 10 is a split die made up of two or more dies so that the extruded profile is bent and cut,
As shown in FIG. 3, the extruded shape member 6 formed by opening the molding die
Can be taken out. The molds divided into two or more may be opened / closed by a hinged structure as shown in FIG. 3 or may be opened / closed by sliding as shown in FIG. Further, in the case of producing a forming die for bending an extruded die material having a long dimension, the forming die may be divided into two or more along the traveling direction of the bending process to produce a forming die of a required length. it can. As shown in FIG. 4, the respective molding dies may be arranged along the processing path and fixed by a fixing means (not shown).

When the extruded shape material is extruded from the extruder, the extruded shape material does not always proceed in a certain direction due to the influence of the deformation at the time of extrusion molding. Therefore, the extruded shape material can be smoothly inserted into the inlet of the forming die 10. There are times when I can't forget. In particular, this tendency remarkably appears at the start of extrusion. On the other hand, by providing the clamp means 15 as shown in FIG.
The tip of the extruded shape member 6 immediately after being extruded from the extruder is gripped and pulled into the forming guide from the inlet of the forming die, so that it can be surely inserted into the forming die. Any known clamping means may be used.By providing the clamping means at the tip of a flexible tube as shown in the figure, it is passed from the outlet side of the molding die to the inlet along the processing path, and the extruded profile is gripped and pulled. You can This clamping means is effective when there is a large amount of deformation resistance, such as when the frictional resistance between the extruded profile and the forming die during bending is large or when the bending radius is small, and a tensile load is applied from the outlet side of the forming die. The deformation resistance can be dealt with by pulling out at a constant speed in synchronization with the extrusion speed. Furthermore,
It is also effective to apply a lubricating oil in order to reduce the frictional resistance between the extruded profile and the molding die.

Further, as is clear from the above description, in the bending process of the present invention, the entire processing path 11 of the forming die 10 does not come into contact with the extruded die material 6 to perform the bending action.
The forming die is composed of bent portions that perform a bending action, a portion that performs a guiding action that connects the bending portions, and a portion that does not contact the extruded shape member and does not participate in the processing action. Therefore, it is not necessary to provide the entire forming guide in a closed structure continuously over the entire circumference of the cross section of the extruded profile, and to provide a forming die that performs a bending action and a guiding action only at a location necessary for such a working action. May be. That is, it exerts a bending action on the mold,
It can be composed of a belt-shaped or rod-shaped member having sufficient strength and width to perform a guiding action. Further, the molding die may be arranged as a discontinuous divided die along the traveling direction of the extruded material. In general, extruded shape materials have circular, rectangular, H-shaped, finned, and other cross-sectional shapes, but depending on these cross-sectional shapes, the width of the working surface and the position and direction of contact and bending action are taken into consideration in these molding guides. The strip,
It can be configured by a rod-shaped body or the like. With such a structure, it is possible to easily create a molding die that is difficult to manufacture, such as a molding die for bending a complicated shape or bending accompanied by deformation of the cross-sectional shape of the extruded profile.

Description will be made with reference to FIG. Reference numeral 6 is an extruded shape member having an irregular cross section, 13 is a forming guide having a bending action which also serves as a guide made of a strip material such as a round bar, and the casing 12
Supported and reinforced by. As shown
Forming guide 1 in contact with the fins of irregular cross section and the outer circumference of the hollow body
3 is provided to exert a required guide and bending action. By appropriately arranging the forming guides in this way, the bending force for the extruded profile is set or the bending force for the fin portion is adjusted. It is possible to change the angle of the fins and impart a twist. After bending, cutting is performed, the casing is released to the left and right as shown in the figure, and the extruded profile is taken out.

According to the function of such a molding guide,
The casing that supports and reinforces the continuous forming guide may be a plurality of forming guide fixtures 14 arranged at appropriate places, for example, places where a bending force is strongly received, as shown in FIG. As shown in the figure, the extruded shape member 6 is extruded from the extruder, guided by the forming guide 13 in accordance with its path, and bent. Since this forming guide is not fixed at any place other than the forming guide fixing tool, the forming guide can be deformed and the path of the forming guide can be corrected by changing the support angle of the forming guide fixing tool. That is, the path of the molding guide, that is, the bending shape can be changed by moving the molding guide fixture.
For example, the molding guide is bolted to the frame through the elongated hole so that the frame can be finely adjusted, so that it is possible to easily correct the bending degree by confirming the influence of springback after bending.

Further, regarding the molding die in which the molding guide 13 is fixed to the casing 12, a structure in which a part of the molding die such as the casing is released along the traveling direction of the extruded profile 6 is shown in FIG.
Shown in This mold has the advantage that the bending process can be observed from the outside and can be maintained as needed. However, as shown in FIG. 8, the guide rail 17 for guiding the clamp mechanism 15 is used. By arranging it along the opening, it is possible to easily perform the pulling operation for applying the pulling load for guiding and bending the extruded profile to the forming die. The bending method of the present invention is characterized in that not only the extruded shape member 6 can be bent while its sectional shape remains unchanged, but also the sectional shape of the extruded material can be changed along the progress direction of the bending process. Have. FIG. 9 shows an L-shaped extruded shape member having different cross-sectional shapes at the front end and the rear end in the processing direction. As shown in the figure, after bending the extruded profile as a whole, the angle of the L-shape is widened at the tip as shown by the arrow, and the conduction path of the molding guide of the mold has a shape to be deformed like this. By arranging them along the line, various bending processes that change the cross-sectional shape in the direction of the front and rear ends of the extruded profile are possible. Further, FIG. 10 shows an example of processing an extruded material having an H-shaped cross section. As shown in the drawing, the H-shaped member is bent downward as a whole, and at the same time, the angle of the H-shaped upper flange portion at the leading end and the trailing end is changed as indicated by the arrow. These examples are examples of deformation processing that changes the angle of the flange of the cross-sectional shape, but processing that deforms the angle of fins such as circular pipes and square pipes and its hollow cross-sectional shape is also part of bending work. Is possible.

[0018]

As described above, according to the present invention, the bending process of the extruded profile is performed continuously and continuously with the extrusion process, thereby improving the production efficiency and the process from the raw material to the product. Can be significantly shortened, and bending of a complicated shape can be performed at low energy cost. Further, the processing method of the present invention enables bending processing accompanied by deformation of the cross-sectional shape, which cannot be performed by the conventional bending processing method, and can manufacture a bent product of an extruded profile with high processing accuracy and productivity. it can.

[Brief description of drawings]

[Figure 1] Aluminum material extruder

FIG. 2 is a schematic layout of an extruder, a cutting machine, and a molding die.

[Fig. 3] Form of taking out a mold and a bent product

FIG. 4 Modes of induction and tensile load of extruded profile using clamps

[FIG. 5] Form of a forming die in which a forming guide is arranged in a casing and a manner of taking out a bent product

[Fig. 6] Molding guide Molding guide fixture

FIG. 7: Structure in which an opening is provided in a part of the casing of the molding die

FIG. 8 is a structure in which a guide rail of a clamp is provided along an opening of a casing of a molding die.

FIG. 9 shows an example in which the deformation of the cross-sectional shape and the bending are simultaneously performed.

FIG. 10 is an example in which the deformation of the cross-sectional shape and the bending are simultaneously performed.

[Explanation of symbols]

1: Extruder 2: Container 3: Extrusion die (die) 4: Platen 5: Billet 6:
Extruded shape material 10: Mold 11: Conducting path (molding guide) 12: Casing
13: Molding guide 14 Molding guide fixture 15:
Clamp 17: Guide rail 20: Cutting machine

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Sasamoto 1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture Nippon Light Metal Co., Ltd., Group Technology Center (72) Inventor Hino, Hinohara Kambara-machi, Anbara-gun, Shizuoka Prefecture 1-34-1 Nippon Light Metal Co., Ltd. Group Technology Center (72) Inventor Keiichi Sugiyama 2-22-20 Higashishinagawa, Shinagawa-ku, Tokyo Within Japan Light Metal Co., Ltd.

Claims (7)

[Claims] 1. A molding die, which constitutes a molding guide of a conduction path along a required bending shape, is arranged opposite to the exit of an aluminum material extruder, and the extruded shape material extruded by the pressing force of the extruding is disposed. A method for bending an aluminum extruded shape material, characterized in that the aluminum extruded shape material is bent in a process of being introduced into a molding die and proceeding along a conduction path of the molding guide. 2. The aluminum extrusion mold according to claim 1, wherein the molding die comprises a molding guide made of a strip material arranged along the processed shape and a molding guide fixture such as a casing supporting the molding guide. Bending method of material. 3. The method for bending an extruded aluminum profile according to claim 2, wherein a forming guide fixture for supporting the forming guide is capable of adjusting the forming guide support angle. 4. The bending of the aluminum extruded profile according to claim 1, wherein the forming guide of the forming die is provided with different cross-sectional shapes from the inlet to the outlet. Processing method. 5. The aluminum extruded profile according to claim 1, 2, 3 or 4, wherein the extruded profile is clamped at its tip to guide the extruded profile into the mold and to apply a tensile force. Bending method. 6. A molding die is provided with an opening along the advancing direction of the extruded shape member, and a guide rail of the extruded shape member clamping means is arranged along this opening to apply a tensile force. 5. The method for bending an aluminum extruded profile according to 5. 7. The extrusion die is filled with the extruded profile, and then the extrusion die while moving the cutter and the die provided between the extruder outlet and the die in synchronization with the extrusion speed. The material is cut into a predetermined length by a cutting machine, and the cutting die and the cutting machine are returned to predetermined positions after cutting.
A method for bending an extruded aluminum profile according to 3, 4, 5, 6 or 7.