JPH0947812A - Press-joining and extruding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a press-joining and extruding die with which the applicability of a light alloy to which press-joining and extrusion is applicable is expanded and the press-joining strength in a press-joined part is improved. SOLUTION: The passage part 4 for press-contact flow having a prescribed length is communicatingly provided at the rear of a forming clearance 3. In the passage part 4 for press-contact flow, the cross-sectional area of its outlet 5 is set larger than the cross-sectional area of the forming clearance 3 and its inner peripheral wall surface 9 is outward sloped from the inlet 6 side toward the side of the forming clearance 3 and the cross-sectional area is made larger from the inlet 6 side toward the side of the forming clearance 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for extruding a metal such as aluminum, particularly for a push-push extrusion.

In this specification, the terms "front" and "rear" are used when the extrusion direction is the front.

[0003]

2. Description of the Related Art In the extrusion of aluminum, for example, so-called push-push extrusion is widely used. In this push-push extrusion, the billet loaded in the container is pushed from the rear by the stem to pass through the molding gap of the die, and the extrusion is completed after leaving the push scrap portion of a predetermined length, that is, the discard portion, and then the container. Back, the discard part is cut with a shear, and the next billet loaded in the container is similarly passed through the molding gap of the die with the stem, thereby repeating the preceding billet metal. The extruded material of the following billet metal is pushed onto the extruded material of 1. and extruded.

[0004]

By the way, in recent years, in various industrial fields such as the field of construction and the field of automobiles, the extruded material used for them has a large coil so as to be convenient for distribution such as export. Therefore, it has been required to form such a coil by using the push-push extrusion method.

However, forming a coil by extruding the extruded material has a difficult problem that cannot be achieved by the current technology. That is, the extruded material for structures used in the construction field, the automobile field, etc. as described above is A50.
00 series alloy, A2000 series alloy, A7000 series alloy, A
There are many hard-type aluminum alloys such as 6000 series alloys and composite materials containing aluminum. With such metals, it is often difficult or impossible to make a splice in extrusion. Therefore, it is difficult to make a splice. When it is required to form a coil for such a material, the extruded materials are usually welded together to form a coil.

[0006] In addition, in the case of a flux type brazing filler metal or a soft aluminum alloy such as pure aluminum, it is possible to carry out push-fitting itself in extrusion. However, the appearance of the pressing joint is not good at all, and therefore the pressing joint is cut off when the extruded material is used.

In view of the above-mentioned conventional problems, the present invention can expand the range of application of metals that can be pushed and pushed and can improve the pushing strength of the pushing portion. The main problem is to provide a die for joint extrusion.

[0008]

The above object is to provide a passage portion for a crimping flow having a predetermined length in communication with a rear portion of a molding gap that defines the outer peripheral shape of an extruded material, and the passage portion for the crimping flow is The cross-sectional area of the material outlet is larger than the cross-sectional area of the molding gap, and the inner peripheral wall surface is inclined outward from the inlet side toward the molding gap side, and the cross-sectional area is directed from the inlet side toward the molding gap side. It is solved by a push-pushing extrusion die characterized by increasing in size.

That is, since a passage portion for a crimping flow having a predetermined length is provided in communication with the rear portion of the molding gap,
After the preceding billet has been extruded and the discard cutting has been performed, when the next billet is loaded into the container and start-up extrusion starts, the trailing billet metal is discharged from the preceding billet metal in the crimp flow passage. While being pressed against the cut surface of the card, it enters into the passage for the pressure bonding flow. The leading billet metal and the trailing billet metal are in a stronger crimping state while the pressing crimping portion moves in the crimping flow passage portion by the length thereof, and the pushing joint force is increased.

Furthermore, the cross-sectional area of the material outlet of the pressure-bonding flow passage portion is larger than the cross-sectional area of the molding gap, and the inner peripheral wall surface is inclined outward from the inlet side toward the molding gap side. By increasing the cross-sectional area from the inlet side toward the molding gap side, the billet metal will be packed into the crimp flow passage during extrusion and the trailing billet will be filled. Resistance when the metal enters the passage for crimping flow is increased, and the leading billet metal and trailing billet metal are more strongly crimped,
As a result, an extruded material having a very high splice strength can be obtained.

In order to enhance the effect of strengthening the connecting force as described above, the angle of inclination from the inlet side of the inner peripheral wall surface of the pressure-bonding flow passage portion toward the molding gap side is outward in the extrusion direction. On the other hand, it is preferable to set the angle to more than 0 ° and 45 ° or less. If it is 0 °, that is, there is no inclination, the effect of strengthening the pushing joint force by such an inclination is not exerted, and if the inclination angle becomes larger than 45 °, such a pushing force is exerted into the pressure-bonding flow passage during extrusion. A harmful dead metal zone that diminishes the joint strengthening effect is likely to occur. A particularly preferable inclination angle is in the range of 2 to 30 °, particularly 5 to 20.
It is in the range of °.

The cross-sectional area at the inlet of the crimp flow passage is equal to the cross-sectional area of the molding gap, or
In particular, it is preferable that it is larger than the cross-sectional area of the molding gap. In addition,
It may be smaller than the cross-sectional area of the molding gap.

In addition, if the length of the pressure-bonding flow passage portion is too long, it may unnecessarily increase the extrusion resistance, but it may not always work effectively in terms of improving the press-fitting force. That is, as described above, by the pushing joint force strengthening action by inclining the inner peripheral wall surface of the crimp flow passage portion outward from the inlet side toward the molding gap side,
It is also one of the features of the present invention that the press-joining performance can be effectively improved while shortening the length of the pressure-bonding flow passage.

Furthermore, it is preferable that the cross-sectional shape of the pressure-bonding flow passage portion is equal to or close to the cross-sectional shape of the molding gap. For example,
When the cross-sectional shape of the molding gap is circular, the cross-sectional shape of the pressure-bonding flow passage portion should also be circular or a shape close to a circle, and the cross-sectional shape of the molding gap should be quadrangular. In this case, it is preferable that the cross-sectional shape of the pressure-bonding flow passage portion is also a quadrangle or a shape close to a quadrangle.

[0015]

Next, an embodiment of the present invention will be described.

In the extrusion processing apparatus shown in FIG. 1,
(1) is a container and (2) is an extrusion die according to the present invention. The hole diameter of the billet hole (1a) of the container (1) is, for example, 75 mm.

In the die (2), (3) is a molding gap, and (4) is a passage for a pressure bonding flow. The passage portion (4) for the pressure bonding flow is directly communicated with the rear portion of the molding gap (3) and is opened at the rear end surface of the die (2).

Although not shown, the die (2) may have a structure in which the passage portion (4) for pressure bonding flow is communicated with the rear portion of the molding gap (3). The passage portion (4) for crimping flow may be communicated with another passage through another passage, or another passage may be communicated with the rear portion of the passage portion (4) for crimping flow. . Further, although not shown, the dice (2) is, for example, a divided construction in which a die construction member having a molding gap (3) and a die construction member having a passage portion (4) for pressure bonding flow are combined. It may be a type of die.

The molding gap (3) has a circular cross-sectional shape, and for example, a circular solid material having a diameter of 3 mm can be extruded. The bearing length L of the molding gap (3) is designed to be relatively long for reasons such as economy and shape stability. The length is, for example, 2 to 10 m
m. This is because if it is less than 2 mm, the die life is shortened, or a defect such as a defective shape is likely to occur, and if it is greater than 10 mm, it is likely to cause an inability to extrude or difficult to extrude. The preferred range is 3-5 mm. Specifically, it is, for example, 4 mm. However, the bearing length L is merely for the reasons such as the economical efficiency and the shape stability as described above. Therefore, the bearing length L may be appropriately designed under various extrusion conditions. It goes without saying that you may come off. Of course, the bearing length may be short as usual.

The passage portion (4) for the crimping flow is
The cross-sectional shape is formed over the entire length into a circular shape or a shape close to a circle corresponding to the cross-sectional shape of the molding gap (3).

The cross-sectional area of the material outlet (5) of the passage portion (4) is larger than the cross-sectional area of the molding gap (3), and the cross-sectional area between the passage portion (4) and the molding gap (3) is large. An annular step surface (7) facing rearward is formed. For example, the diameter of the molding gap (3), that is, the diameter d of the extruded material (E) is 3 mm as described above.
, The diameter b of the material outlet (5) is, for example, 1
It is set to 0 mm.

The passage portion (4) has its inner peripheral wall surface (9) inclined outward from the inlet (6) side toward the molding gap (3) in the radial and latitudinal direction so that its cross-sectional area is the inlet. It is increasing from the (6) side toward the molding gap (3) side.
The tilt angle, that is, the tilt angle α with respect to the extrusion axis direction
Is designed to be 10 °, for example.

The length c of the crimp flow passage portion (4)
Is set to, for example, 8 mm, although it varies depending on extrusion conditions and the like.

The cross-sectional area of the inlet portion (6) of the passage portion (4) is, of course, smaller than the diameter of the container billet hole (1a). It is designed to be larger than the cross-sectional area of the molding gap (3) for reasons such as uniform metal flow. The diameter a of the inlet portion (6) is, for example, 7.2 mm.

When the die (2) having the above-mentioned structure is used, the die (2) is arranged at the front end portion of the container (1) and the extrusion is carried out, the following is obtained.

That is, as shown in FIG. 2 (a), the aluminum billet (B1) loaded in the billet hole (1a) of the container (1) is pushed by the stem (10) and a pushing scrap of a predetermined length is pushed. Part, that is, the discard part (D) is left, the container (1) is retracted, and the discard part (D) is removed at the shear (11) as shown in FIG. 2B. To remove. Since the passage portion (4) for the crimping flow of the die (2) is formed in an inwardly expanding shape from the inlet (6) toward the molding gap (3) side, by cutting this discard portion (D). The billet metal (B1) in the die (2) is prevented from jumping out.
The crimp flow passage portion (4) of the present invention also has such a function.

Next, as shown in FIG. 2C, the next billet (B2) is placed in the billet hole (1) of the container (1).
Load a) and move the stem forward to start push extrusion. Then, as shown in FIG. 3, the trailing billet metal (B2) is pressed against the discard cut surface of the preceding billet metal (B1) in the crimping flow passage (4) while being pressed. Enter into the passageway (4). The leading billet metal (B1) and the trailing billet metal (B2) are in a stronger crimping state while the pressing crimping portion moves through the crimping flow passage portion (4) by the length thereof. , Increase the joint strength.

In addition, in the pressure-bonding flow passage portion (4), the cross-sectional area of the material outlet portion (5) is larger than the cross-sectional area of the molding gap (3), and the inner peripheral wall surface (9) is introduced into the inlet (6). ) Side toward the molding gap (3) side and the cross-sectional area increases from the inlet side to the molding gap side, so that the trailing billet metal (B2) is crimped during extrusion. When the trailing billet metal (B2) enters the crimp flow passage (4) in such a state that it is packed in the flow passage (4), the resistance is increased. The billet metal (B1) and the trailing billet metal (B2) are more strongly pressure-bonded. As a result, a push-extruded extruded material (E) having high push-joint strength can be obtained.

In addition, as described above, since the cross-sectional area of the material outlet (5) of the pressure-bonding flow passage (4) is larger than the cross-sectional area of the molding gap (3), the trailing billet metal ( In B2), the press joint portion is largely deformed in the process of entering the molding gap (3) from the crimp flow passage portion (4) to form a press joint portion which is stronger in strength, and at the same time, the crimp flow passage passage. Since the cross-sectional area of the inlet (6) of the part (4) is larger than the cross-sectional area of the molding gap (3), the deformation of the press-joint portion due to the difference is also assisted, and the press-joint of the press-joint portion is assisted. Strength is made even stronger.

As described above, a push-joint extruded material (E) having a very high push-joint strength can be obtained.

Incidentally, as described above, when the cross-sectional shape of the molding gap (3) is circular and the transverse cross-sectional shape of the pressure bonding flow passage (4) is also circular, the vertical cross-sectional shape of the push joint (j) is As shown in FIG. 4B, the wedge shape is formed, and a very strong push joint can be formed. If the cross-sectional shape is elliptical, as shown in FIG.
Although it may be bowl-shaped, the strength of the pushing joint (j) is also high in this case.

When the above-mentioned die (2) and container (1) were used to carry out push-extrusion with a billet made of flux-containing brazing filler metal, the strength of the push-joint portion of the push-extruded extruded material was The strength was higher than the strength of parts other than the joint, and the appearance was also good.

Further, when the push-extrusion was carried out using the A5052 alloy billet, which has been considered to be very difficult to push-extrude, the obtained push-extruded material is strong enough to make it into a coil. It was pushed in at the pushing strength.

[0034]

As described above, according to the die for extrusion of push-jointing of the present invention, since the passage portion for the crimping flow having a predetermined length is provided in communication with the rear portion of the molding gap, the extrusion of the preceding billet is performed. After completing the discard cutting and loading the next billet into the container and starting the push-out extrusion, the billet metal in the trailing part is pressed against the discard cutting surface of the preceding billet metal in the crimp flow passage. While being pressed, it enters into the pressure-bonding flow passage. The leading billet metal and the trailing billet metal, while the pressing crimping portion moves in the crimping flow passage portion by the length thereof,
A stronger crimping state is created, and the joint pressure is increased.

Furthermore, the pressure-bonding flow passage portion has a material outlet portion whose cross-sectional area is larger than the cross-sectional area of the molding gap, and its inner peripheral wall surface is inclined outward from the inlet side toward the molding gap side. Since the cross-sectional area is increasing from the inlet side to the molding gap side, the billet metal is packed into the passage for crimping flow during extrusion, and the billet metal is The resistance of the leading billet metal and the trailing billet metal is more strongly pressure-bonded to each other when the pressure is increased as it enters the pressure-bonding flow passage portion.

As a result of the above, it is possible to obtain a pushing joint extruded material having a high joint strength.

Therefore, it is possible to perform push-and-push extrusion even for metals that have been difficult or impossible to push-and-push and push, and it is possible to expand the applicable range of metals that can be push-and-push and push. Further, even for a push-joint extruded material, which has not always been sufficient in the push-joint strength at the push-joint portion, the push-joint strength of the push-joint portion can be made high, and the appearance of the push-joint portion is good. It can be anything.

Moreover, as described above, in the pressure-bonding flow passage portion, the cross-sectional area of the material outlet portion is larger than the cross-sectional area of the molding gap, and the inner peripheral wall surface is directed outward from the inlet side toward the molding gap side. Since the cross-sectional area is gradually increased from the inlet side toward the molding gap side, the length of the crimp flow passage is kept short and the pushing strength of the pushing joint is high. A spliced extruded material can be obtained.

In addition, the passage for the die crimping flow is
In this way, since it is formed in the shape that expands inward from the inlet toward the molding gap side, when cutting the discard part, the billet metal in the die pressure bonding flow passage part may fly outside. It is possible to reliably prevent the occurrence of inconveniences that hinder the progress of push-push extrusion.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a die according to an embodiment.

FIG. 2A to FIG. 2C are cross-sectional views sequentially showing a push-push extrusion process.

FIG. 3 is a cross-sectional view showing a push-and-push extrusion process performed subsequent to FIG.

4 (a) and (b) are vertical cross-sectional views of the pushing and extruding material.

[Explanation of symbols]

 2 ... Die 3 ... Molding gap 4 ... Crimping flow passage 5 ... Exit 6 ... Entrance E ... Extruded material

Claims (1)

[Claims] 1. A passage portion for a crimping flow having a predetermined length communicates with a rear portion of a molding gap that defines an outer peripheral shape of an extruded material, and the passage portion for the crimping flow has a cross-sectional area of its material outlet portion. It is larger than the cross-sectional area of the molding gap, and its inner peripheral wall surface is inclined outward from the inlet side toward the molding gap side to increase the cross-sectional area from the inlet side to the molding gap side. A characteristic die for extrusion extrusion.