JPH046450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for producing aluminum extrusion bent products such as automobile frames, bumpers, side seals, rail materials, etc.

Note that in this specification, the term aluminum is used to include its alloys.

Conventional techniques and issues The production of extruded aluminum products has traditionally been
This method involves forming a straight material with a predetermined cross-sectional shape using an extrusion processing device, cutting it to a predetermined length, and then applying cold bending to the cut product using a bending device. It was done.

However, in the above-mentioned method, the extrusion process and the bending process are performed in separate and independent processes, and therefore productivity is not excellent.

In addition, in the above method, bending is performed cold, so if a bent product with a curved part with a small radius of curvature is manufactured, the dimensional accuracy of the curved part will be poor, and the bending process will deteriorate. There was a risk that defects such as buckling, wrinkles, rough skin, and cracks would occur on the surface of the parts, leading to subsequent cracks, deformation, and damage.

In particular, when attempting to form a curved portion with a small radius of curvature in a section having a large cross-sectional size, such as a section for an automobile frame, the above-mentioned problems have become conspicuous. Therefore, in this case, especially the curved part,
It was also possible to manufacture a piece by joining multiple pieces of curved plate together in a patchwork manner by welding each other, but the appearance did not look good, so the bent part was made into an integral molded product by bending. It was hoped that.

Therefore, it is conceivable to heat the shaped material and perform a hot bending process.

However, in that case, the addition of a heating step increases the number of manufacturing steps, leading to problems such as an increase in product cost.

In view of the above-mentioned problems, the present invention is capable of processing curved parts with a small radius of curvature, even in large cross-sectional sizes, with good dimensional accuracy and without producing defects. Good sex,
It is an object of the present invention to provide a method for manufacturing aluminum extrusion bent products such as automobile frames, bumpers, side seals, etc., which can be realized cost-effectively.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cross-sectional shape corresponding to the cross-sectional shape of the forming hole 6 of the extrusion mold 4 of the extrusion processing apparatus 1 at a position near the front of the extrusion mold 4 of the extrusion processing apparatus 1. A fixed mold 7 having a passage hole 9 is disposed coaxially with the extrusion mold 4, and also has a passage hole 10 having a cross-sectional shape corresponding to the cross-sectional shape of the forming hole 6 of the extrusion mold 4. A movable mold 8, which is supported so as to be turnable and displaceable, receives the mold material 14 extruded from the molding hole 6 of the extrusion mold 4 using equipment placed adjacent to the front of the fixed mold 7. The movable mold 8 is rolled while passing through the passage holes 9 and 10 of both the fixed and movable molds 7 and 8.
Aluminum extrusion bent products such as automobile frames, bumpers, side seals, etc., characterized in that the shape material 14 is bent with the fixed mold 7 as a fulcrum by displacement operation, thereby forming the bent portion 15 in the shape material 14. The gist is the manufacturing method.

Effects In the above configuration, the rolling and displacement of the movable mold 8 causes bending to be applied to the extruded material 14 which is still in a high temperature state immediately after extrusion, thereby achieving hot bending.

Moreover, the fixed mold 7 is used, and its passage hole 9
is formed to correspond to the cross-sectional shape of the mold material 14, so that the bending effect due to rolling and displacement of the movable mold 8 is transmitted to the extrusion mold 4 side of the fixed mold 7.
The cross-sectional shape and dimensions of the mold material 14 extruded from the molding hole 6 of the extrusion mold 4 are maintained at appropriate values.

Furthermore, since the passage hole 10 of the movable mold 8 is also formed to correspond to the cross-sectional shape of the mold material 14, when the mold material 14 is bent due to rolling or displacement of the movable mold 8, the same shape material 14 is bent. Possible deformations and the like are suppressed and corrected, and bending without deviation in cross-sectional shape is realized.

Furthermore, since the mold material 14 is passed through the passage holes 9, 10 of both fixed and movable molds 7, 8 to impart bending, three-dimensional bending can also be imparted to the mold material 14.

Embodiment Next, an embodiment of the present invention will be described based on the drawings.

1 and 2, 1 is an extrusion processing device, 2 is a bending device, and the bending device 2
is arranged near the front of the extrusion processing device 1. An extruded aluminum bent product is manufactured using equipment consisting of a combination of these devices 1 and 2.

The extrusion processing apparatus 1 is a general type used for extrusion molding of aluminum. By applying an extrusion force, the billet metal is passed through the forming hole 6 of the extrusion die 4, thereby forming a mold material 14 having a predetermined cross-sectional shape.

On the other hand, the bending device 2 utilizes a fixed mold 7 and a movable mold 8 of a known multi-bender as shown in FIG.

First, the general configuration of this multi-bender will be explained based on FIG. 4. 7 is a fixed mold, 8 is a movable mold that can be turned and displaced in three dimensions, and 20 is a work feeder. Both the fixed and movable molds 7, 8 are provided with workpiece passage holes 9, 10 having a cross-sectional shape corresponding to the cross-sectional shape of the workpiece W. The work feeder 20 feeds the work W into both molds 7 and 8 by gripping or pushing the rear end of the work W.
It is forcibly passed through the passage holes 9 and 10 of. That is, by rolling and displacing the movable mold 8 three-dimensionally while passing the work W through the passage holes 9 and 10 of both molds 7 and 8 at the work feeder 20,
The workpiece W is bent using the fixed mold 7 as a fulcrum, and a bent portion is formed in the workpiece W.

The fixed mold 7 and the movable mold 8 in this multi-bender are used, and as shown in FIG. In the arranged state, it is arranged at a position close to the front of the extrusion processing apparatus 1.

The movable mold 8 is supported via a gyroscope mechanism as shown in FIG. 3, for example, in order to achieve three-dimensional rolling and displacement motion as shown by the solid line arrow in FIG. .

That is, the movable mold 8 is supported in a cantilevered manner on the inner surface of the upper end of the 1/4 arc-shaped first frame 21 via the horizontal shaft 22, and is rotationally displaced around the horizontal shaft 22 to move left and right. The turning operation is performed around the τ axis extending in the direction. and,
The first frame 21 is supported by a second frame 24 via a vertical shaft 23 at its lower end, and when the first frame 21 is rotationally displaced around the vertical shaft 23, the movable mold 8 is moved in the vertical direction. The turning operation is performed around the φ axis extending from . Furthermore, this second frame 24 is supported by a support base (not shown) and is moved relative to the base, so that the movable mold 8 is rotated around the θ axis (see FIG. 4) extending in the workpiece conduction direction. It is assumed that the turning operation is performed. Furthermore, it is supported so that it can be displaced in the front-rear direction, left-right direction, and up-down direction. Thereby, three-dimensional turning/displacement operation of the movable mold 8 is realized. Note that this turning/displacement operation is controlled by a control device (not shown).

The molds 7 and 8 are preferably made of a hot work tool steel with excellent heat resistance and high hardness, such as Cr-plated SKD61, carbon, or ceramic.

Furthermore, the molds 7 and 8 shown in FIG. 2 are constructed as sliding molds in which the workpiece passes through the inner surfaces of the passage holes 9 and 10 while sliding.
As shown in FIG. 5, passage holes 9 and 10 are formed by a combination of rollers 11.
It is also possible to use so-called roller molds.
In the case of using a roller mold, it is advantageous in that it is possible to avoid sliding scratches caused by the molds 7 and 8 on the surface of the workpiece passing through the passage holes 9 and 10. Although not shown in the drawings, this roller mold has, for example, a roller support frame that rotatably supports each roller 11. and,
The roller mold performs three-dimensional turning and displacement operations like the sliding type movable mold described above by having its roller support frame supported via the gyroscope support mechanism as described above. It is done.

Note that a cutter 12 is disposed near the exit of the passage hole 10 of the movable mold 8 of the bending device 2 in this embodiment.

The method of the present invention is carried out as follows using the equipment configured as described above.

First, the movable mold 8 is set to be coaxial with the extrusion mold 4 and the fixed mold 7, and the billet 13 is loaded into the container 3 of the extrusion processing apparatus 1.

As the billet 13, 6000 series aluminum alloy with excellent extrusion processability used for automobile frames, etc., or 7000 series aluminum alloy for welded structures, etc. is used.

Then, under a predetermined high temperature, an extrusion force is applied to the billet 13, the billet metal is passed through the forming hole 6 of the extrusion die 4, and the extruded shape 14 is extruded forward.

This extruded shape member 14 has molded holes 6 as described above.
Since the passing holes 9 and 10 are set to be coaxial, the fixed mold 7 of the bending device 2
It passes through the passage hole 9 of the movable mold 8 and the passage hole 10 of the movable mold 8, and moves forward while maintaining a high temperature state.

In such an extrusion transition state of the mold material 14,
When the movable mold 8 is turned and displaced in a predetermined manner, the mold material 14 is bent with the fixed mold 7 as the intersection point, and a bent portion 15 is formed.

That is, for example, the movable mold 8 rolls upward around the left-right axis (τ axis in FIG. 3) and is displaced by a slight distance upward in the vertical axis (φ axis in FIG. 4). When the condition is controlled, a downwardly convex bent portion is formed in the mold material 14. Also, for example, the movable mold 8 rolls downward around the left-right axis (τ axis in FIG. 3) and is displaced by a slight distance downward in the vertical axis (φ axis in FIG. 4). When controlled in this state, an upwardly convex bent portion is formed in the mold material 14.

By bending the mold material 14 while controlling the position of the movable mold 8 in the front-rear direction, the bent portion can be formed into a wide range of curvature radii, from large curvature radii to small curvature radii. It is possible to perform proper bending without any problems.

Note that the extruded section 14 in which the predetermined bent portion 15 has been formed is cut by the cutter 12 and then aged.

Effects of the Invention As described above, the method for manufacturing an aluminum extrusion bent product of the present invention involves bending a shape material that is still in a high temperature state immediately after extrusion, so it can be used to produce large cross-section products such as automobile frames, bumpers, etc. Even in the form material of
and can be formed without defects. In addition,
There is no need to go through the process of heating the shape material in order to perform hot bending, and extrusion curved products can be manufactured at low cost.

Moreover, since a fixed mold is used for bending and its passage hole is formed to correspond to the cross-sectional shape of the mold material, the bending effects due to rolling and displacement of the movable mold are not affected by the extrusion mold side. This influence is blocked by the fixed mold, and the cross-sectional shape and cross-sectional dimensions of the mold material extruded from the molding hole of the extrusion mold can be maintained at appropriate values. It is possible to manufacture curved products with high dimensional and shape accuracy.

In addition, since the passage hole of the movable mold is formed to correspond to the cross-sectional shape of the mold material, the deformation that may occur in the mold material when bending the mold material due to rolling or displacement of the movable mold is avoided. suppressed and corrected,
It is possible to achieve even better bending with no deviation in the cross-sectional shape, and it is also possible to give the shape material three-dimensional free bending.

In this way, large curved products, such as side seals, which were conventionally formed by welding bent parts at more than 10 points, can be manufactured into suitable parts without welding. be able to.

In addition, since the extruded mold material is bent, extrusion curved products can be manufactured efficiently and productivity can be improved.

[Brief explanation of drawings]

Fig. 1 is a schematic partial cross-sectional side view showing one embodiment of the equipment used in the method of the present invention, and Fig. 2 is a perspective view schematically showing the state in which an extrusion bent product is manufactured using the same equipment. , FIG. 3 is a front view showing the support structure of the movable mold, FIG. 4 is a sectional view showing the general configuration of a bending device using a movable mold and a fixed mold, and FIG.
The figure is a partial perspective view showing another embodiment of the bending die. 1... Extrusion processing device, 2... Bending processing device, 4
... Extrusion mold, 6 ... Molding hole, 7 ... Fixed mold, 8 ... Movable mold, 9, 10 ... Passing hole, 13
... billet (extruded material), 14 ... extruded shape,
15...Bending part.

Claims (1)

[Claims] 1. A fixed mold having a passage hole 9 having a cross-sectional shape corresponding to the cross-sectional shape of the molding hole 6 of the extrusion mold 4 at a position close to the front of the extrusion mold 4 of the extrusion processing apparatus 1. 7 is
It is disposed coaxially with the extrusion mold 4, has a passage hole 10 having a cross-sectional shape corresponding to the cross-sectional shape of the forming hole 6 of the extrusion mold 4, and is supported so as to be turnable and displaceable. The movable mold 8 uses equipment placed adjacent to the front of the fixed mold 7 to transfer the mold material 14 extruded from the forming hole 6 of the extrusion mold 4 to both the fixed and movable molds 7 and 8. The movable mold 8 is rolled while passing through the passage holes 9 and 10.
Aluminum extrusion bent products such as automobile frames, bumpers, side seals, etc., characterized in that the shape material 14 is bent with the fixed mold 7 as a fulcrum by displacement operation, thereby forming the bent portion 15 in the shape material 14. manufacturing method.