JPH0367764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an extrusion processing device, such as a rail material,
The present invention relates to an extrusion processing apparatus for manufacturing extrusion products having curved parts such as automobile bumpers.

Conventionally, in order to produce extruded products made of metal such as aluminum, which have curved parts, generally, first, a straight extruded shape with a predetermined cross-sectional shape is produced using an extruder, and then this is usually cut into a predetermined length. After cutting, it was manufactured by cold bending using a bending machine.

Problems to be Solved by the Invention By the way, in the above method, if the radius of curvature required for the bent part of the extruded product is so small that it exceeds a certain limit, the bent part with such a small radius of curvature is When formed into an extruded shape, defects such as buckling, wrinkles, rough skin, and cracks appear on the surface, leading to deterioration in the quality of the extruded product. Therefore, the above method can only be applied to the case of forming a curved portion with a relatively large radius of curvature within a range in which such defects do not appear.

In addition, when forming a bent part in a large extruded section, the bending stress on the surface becomes large when bending is applied, so even if the bent part has a relatively large radius of curvature, the surface The above-mentioned defects appear in the extruded product, leading to deterioration in the quality of the extruded product.

This invention was made in view of the above-mentioned problems, and its purpose is to eliminate defects such as buckling, wrinkles, rough skin, and cracks on the surface.
An object of the present invention is to provide an extrusion processing apparatus capable of manufacturing an extrusion product of a desired size and having a bent portion with a desired radius of curvature.

Means for Solving the Problems In order to achieve the above object, the extrusion processing apparatus of the present invention includes a die disposed at the front end of a container into which the extrusion material is loaded, and a die that allows the extrusion material to pass through the extrusion processing apparatus. It has a die hole for forming an extruded material having a cross-sectional shape, and a part near the exit of this die hole is provided so that the extruded material moves laterally while guiding the outer surface of the extruded material immediately after passing through the die hole. The main feature is that a movable guide member for metal flow control is provided to displace the material laterally with respect to the die hole at its guide portion.

Function In the above extrusion processing apparatus, when the movable guide member displaces the extruded material immediately after extrusion laterally with respect to the die hole, the extruded material that is about to pass through the die hole moves on the displaced side of the extruded material. The extruded material is extruded at a speed that is relatively smaller than the speed of the extruded material flowing on the side opposite to the displacement side, and as a result, a bend is formed in the extruded section. That is, the movable guide member does not bend the mold material using the die as a fulcrum, but rather changes the flow direction of the extruded material to form a bent portion in the mold material.

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

In FIG. 1, 1 is a container, into which an extruded material 2 made of a metal material such as aluminum is loaded, and the extruded material 2 is moved forward by a ram 3 disposed at the rear of the container 1. is pushed forward. In addition, 4
is a dummy block.

On the other hand, a die 5 is provided at the front end of the container 1. The dice 5 includes a first die 6 and a second die 7, and the first die 6 is interposed between the second die 7 and the container 1. The first die 6 is provided with an approach hole 8 whose cross-sectional area gradually decreases from the container 1 side toward the front. The die 7 is designed to withstand the extrusion load. Also the second die 7
A bearing hole 9 and a relief hole 10 are provided in series from the first die 6 side toward the front. The first die 6 and the second die 7 are overlapped with each other to form the approach hole 8 and the bearing hole 9, respectively.
The relief hole 10 is located concentrically with the die hole 11 of the die 5. When the extruded material 2 in the container 1 receives a forward extrusion force, its cross-sectional area is first reduced by passing through the approach hole 8 of the first die 6 and then through the bearing hole 9 of the second die 7. The extruded profile 12 is formed into a predetermined cross-sectional shape by passing through the die 5 through the relief hole 10.
It's being pushed out.

On the other hand, a metal flow control movable guide member 13 is disposed near the exit of the die hole 11, that is, at a position immediately after exiting the relief portion 10 of the second die 7. The movable guide member 13 has a guide hole 15 formed in a plate-shaped guide member main body 14 having a circular, oval, or other suitable shape, for example. The guide hole 15 is configured to allow the extruded section 12 from the die hole 11 to be inserted therethrough, and to slidably guide the outer surface of the extruded section 12 on its inner surface. This movable guide member 13 is supported so as to be movable laterally with respect to the die hole 11, and its movement or movement distance can be electrically controlled, for example, by a control device (not shown). Note that the area extending from the inner surface of the guide hole 15 to the peripheral edges of its entrance and exit is a curved surface, and when the movable guide member 13 moves laterally, this area hits the outer surface of the extruded shape member 12. It is designed so that no damage is caused to its external surface.

Next, the operating state of the extrusion processing apparatus having the above configuration will be explained. First, drive the ram 3 to extrude the material 2.
is extruded from the die hole 11, and the extruded section 12 is inserted into the guide hole 15 of the movable guide member 13. Then move the movable guide member 13 laterally,
The outer surface of the extruded section 12 is pushed and displaced laterally by the inner surface of the guide hole 15. Then, the extruded material 2 that is about to pass through the die hole 11 has an extrusion speed that is higher than the extrusion speed of the extruded material 2 that flows on the displaced side of the extruded section 12 that is opposite to the displaced side. It is extruded into small pieces,
As a result, a bent portion is formed in the extruded section 12. Note that the relationship between the amount of lateral movement of the movable guide member 13 and the radius of curvature of the bent portion of the extruded section 12 obtained at the position after the movement is determined in advance, and the movable guide member is moved according to that relationship. By moving 13, a curved portion with a desired radius of curvature can be formed.

As described above, in the above embodiment, the movable guide member 13 is disposed at a position immediately after exiting the relief hole 10 of the die 5, and the extrusion immediately after extrusion is carried out on the inner surface of the guide hole 15 of this movable guide member 13. The extruded section 1 is guided while the outer surface of the section 12 is guided.
Since the extruded material 2 is pushed and displaced laterally with respect to the die hole 11, the extruded material 2 is extruded from the die hole 11 as an extruded section 12 while being bent. In other words, by displacing the extruded section 12 laterally at a position immediately after passing through the die hole 11, the flow state of the extruded material 2 extruded from the die hole 11 is changed, thereby forming a curved portion. be. Therefore, it is possible to produce an extruded product of a desired size and a bent portion with a desired radius of curvature without causing defects such as buckling, wrinkles, roughness, or cracks on the surface. It is.

In addition, since conventional extrusion processing equipment processes straight extruded shapes, it was necessary to extrude them to a predetermined length and then cut them due to space constraints, but in the above example, extruded shapes Since the material is extruded while forming curved portions, continuous extrusion can be made possible.

In addition, since the lateral movement distance of the movable guide member 13 can be adjusted as appropriate, it is possible to form bent parts with various radii of curvature in the extruded product, and it is also possible to form curved parts with various radii of curvature in one extruded product. It is also possible to form multiple bends with different radii.

Furthermore, since the extrusion process and the bent part forming process are integrated, it is possible to improve the manufacturing efficiency of extruded products having bent parts.

Furthermore, in the above embodiment, the extruded shape member 12 has the die hole 11 and the front and rear portions of the guide hole 15.
Since the movable guide member 13 is extruded while being supported at certain points, when producing a straight extruded product, the guide hole 1 of the movable guide member 13
5 is placed concentrically with the die hole 11, unexpected bending can be avoided by arranging the extruded section 12
It is also possible to prevent this from occurring.

In the above embodiment, a movable guide member in which the guide hole 15 is formed in the plate-shaped guide member main body 14 is used, but the guide hole 15 is not limited to this.
Any type of movable guide member can be used as long as it has a configuration that allows the extruded section 12 to be displaced laterally immediately after passing through the movable guide member. Further, in the above embodiment, the dice 5 are the first dice 6 and the second dice 5.
Although the die 7 has been described, it is also possible to configure this die as a single die having similar approach holes 8, bearing holes 9, and relief holes 10.

Effects of the Invention As described above, in the extrusion processing apparatus of the present invention, a die is disposed at the front end of a container into which the extrusion material is loaded, and the die passes the extrusion material to form a predetermined cross-sectional shape. It has a die hole for forming an extruded shape, and a part near the exit of the die hole is provided with a die that moves laterally while guiding the outer surface of the extruded shape immediately after passing through the die hole, and guides the extruded shape. A movable guide member for metal flow control is disposed in the section to displace laterally with respect to the die hole, so by moving the movable guide member laterally, the guide portion of the extruded section is moved laterally to the die hole. When the extruded material tries to pass through the die hole, the speed of the extruded material flowing on the displaced side of the extruded section is relative to the speed of the extruded material flowing on the side opposite to the displaced side. This results in the extrusion being extruded in a smaller size, thereby creating a bend in the extruded profile. In other words, unlike the conventional method of forming a bent part in an extruded section by applying bending force, the extruded section is displaced laterally at a position immediately after passing through the die hole. It changes the flow state of the extruded material extruded from the pipe, thereby forming a bend. Therefore, it is possible to produce an extruded product of a desired size and a curved portion with a desired radius of curvature without causing defects such as buckling, wrinkles, rough skin, and cracks on the surface portion. .

In addition, by adjusting the displacement amount and direction of the movable guide member, it is possible to easily obtain various curved molded products with different radii of curvature and bending directions, making it easy to mold various molded products with curved parts. can correspond to

Furthermore, it is also possible to form a plurality of curved portions with different radii of curvature and different bending directions into a single molded material.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view showing an embodiment of an extrusion processing apparatus of the present invention. 1... Container, 2... Extruded material, 5... Die, 11... Die hole, 12... Extruded shape, 13
...Movable guide member.

Claims (1)

[Claims] 1 A die is disposed at the front end of the container into which the extruded material is loaded, and this die has a die hole through which the extruded material passes to form an extruded shape with a predetermined cross-sectional shape. In the vicinity of the exit, there is a metal flow control device that moves laterally while guiding the outer surface of the extruded shape immediately after passing through the die hole, and displaces the extruded shape laterally with respect to the die hole at the guide portion. An extrusion processing device characterized by being provided with a movable guide member for use in the extrusion process.