JP3127765B2 - Extrusion dies and extruded aluminum profiles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion die suitable for obtaining an aluminum profile having a small variation in wall thickness and an aluminum extrusion profile obtained by using the molding die.

[0002]

2. Description of the Related Art When a metal material is extruded by a direct extrusion method, the thickness of the obtained extruded material varies depending on the progress of the extrusion. Normally, the thickness variation of the extruded material is thick at the start of pressing and thin at the end of pressing as shown in FIG. The thickness difference Δt between the start and end of pushing is large at the start of extrusion, and becomes smaller as the number of extruded billets increases. The reason why the thickness difference Δt becomes smaller as the number of extruded billets increases as described above is because the temperature of the extruder is stabilized when extrusion is repeated, and the extrusion is continued in a steady state. However, even if the extrusion is repeated many times, the thickness difference Δt does not become zero even if it becomes small,
Extruded articles with different wall thicknesses at the start and end of the pressing are still produced. As a result, if the dimensional tolerance is not satisfied, a part where the pressing starts beyond the predetermined thickness and a part where the pressing ends where the thickness does not reach the predetermined thickness are cut from the extruded product, thereby lowering the production yield of the extruded product. In addition, quality and productivity are impaired. In the conventional extrusion method, a means for stabilizing the temperature of a die tool system including a billet and an extruder is provided on the assumption that a change in a die bearing opening width is caused by a thermal distortion of a die in order to avoid a thickness variation. Has been adopted.

[0003]

However, even if the temperature of the die tool system is stabilized, the thickness difference Δt does not become zero. This is also indicated by the fact that the thickness difference Δt still exists even when the number of extrusions is increased in FIG. The cause of the thickness variation in the extruded profile is that the bearing opening width changes depending on process parameters such as (1) die temperature, (2) extrusion working force _Wf, and (3) container sealing force S. If there is no change in the process parameters, the extrusion is performed with the bearing opening width being constant, and the extruded material immediately after passing through the bearing does not have a thickness variation. However, in practice, the process parameters change during extrusion, so that the thickness of the resulting extruded profile varies.
In this regard, the conventional method for stabilizing the temperature of the die tool system targets only the thermal strain derived from the die temperature, and is insufficient for stabilizing the process parameters. In particular, regarding the container sealing force S of (3), since the shear frictional force of the metal in the container, which is a component of the container sealing force S, depends on the contact area of the metal with the inner surface of the container, the change during one push is suppressed. It is not possible. Due to these factors, the current extruder has a limit in suppressing the thickness variation of the extruded profile by stabilizing each process parameter. However, in recent years, where higher quality products are required, there is a demand for an extruded section having substantially no thickness difference and a uniform shape. The present invention has been devised in order to solve such a problem. The present invention relates to a method in which an extrusion direction load of a container sealing force transmitted to a die tool system through a container is combined with an extrusion direction load component force and a die in a plane perpendicular to the extrusion direction. By adopting a structure that can be decomposed into the load component force in the center direction, the thickness difference between the push start and the push end in each push is substantially eliminated, and the thickness difference between pushes between different pushes is minimized. The purpose is to obtain an extruded profile.

[0004]

In order to achieve the object, an extrusion die of the present invention comprises a die having a bearing surface formed thereon and a die holder surrounding the die.
It is tapered to generate a component force from the container sealing force toward the center of the die. The taper may be provided so that the outer peripheral surface of the die is reduced in diameter in the extrusion direction.
In this case, the container is brought into contact with the die or the baffle such that the container sealing force is transmitted to the die directly or through the baffle. Alternatively, the outer peripheral surface of the die may be tapered so as to expand in the extrusion direction. In this case, the container is brought into contact with the die holder so that the container sealing force is transmitted to the die holder. In the case of a die having a taper whose outer peripheral surface increases in diameter in the extrusion direction, a tapered ring can be inserted between the die and the die holder. In this case, the container is brought into contact with the tapered ring.

The taper is inclined at an appropriate angle with respect to the extrusion direction such that a component force directed toward the center of the die in a plane perpendicular to the extrusion direction has a magnitude necessary for adjusting the bearing opening width. The tapered dice components are preferably smoothed or lubricated to reduce frictional resistance so that they can slide relative to one another. The displacement of the slide of each component of the die is increased by providing a clearance. The clearance is provided in a plane perpendicular to the extrusion direction between the die and the backup die or between the backup die and the bolster when the outer peripheral surface of the die is tapered in the extrusion direction. When the outer peripheral surface of the die is tapered so as to expand in the extrusion direction, a clearance is provided between the die holder and the backup die or between the die holder and the bolster in a plane perpendicular to the extrusion direction. Alternatively, in a structure in which the tapered ring is inserted between the die and the die holder, a clearance may be provided between the die and the die holder at the distal end position of the tapered ring.

As described above, the thickness of the extruded profile tends to be thicker at the start of pushing and smaller at the end of pushing during one push. This thickness variation is caused by a change in pressure and a change in heat during extrusion of the billet. According to the present invention, the dies, baffles, die holders, backup dies, and other components that make up the die tool system are tapered so that the container sealing force acting on the die tool system in the extrusion direction causes the die to move in a plane perpendicular to the extrusion direction. A load component force directed toward the center is generated. Since this load component force depends on the shear frictional force of the aluminum alloy generated on the inner wall of the container, it acts on opening and closing the bearing opening width so that it is large at the start of pushing and small at the end of pushing. As a result, the bearing opening width is narrowed at the start of the pressing and increases toward the end of the pressing. Incidentally, the taper of the components constituting the die tool system is disclosed in Japanese Patent Application Laid-Open No. 58-16726.
JP, JP-A-63-149011, JP-A-6-14901
It is disclosed in, for example, Japanese Patent Publication No. 114435. However, none of the tapered dies has the effect of adjusting the bearing opening width. For example, in the die disclosed in Japanese Patent Application Laid-Open No. 58-16726, the surface of the extruded material is tapered to exert a punching action. In JP-A-63-149011, the nib and the intermediate shrink case are taper-fitted to prevent removal. In Japanese Patent Application Laid-Open No. 6-114435, an alloy ring is taperedly fitted to a die base in order to prevent the alloy ring from coming off. in this way,
It is the first time according to the present invention to taper to create a component force from the force in the extrusion direction toward the center of the die.

In the die tool system according to the present invention, as shown in FIG. 2, a die 1 is supported by a die holder 2 and is disposed between a baffle 3 and a backup die 4. Die 1
The baffle 3 set at the rear of the die 1 can be omitted. However, the baffle 3 is mainly used for extruding a solid material, and the outer peripheral surface of the die 1 has a taper T whose diameter is reduced in the extrusion direction. , Are arranged in contact with the container 5. The backup die 4 faces the platen 7 via the bolster 6. Between the container 5 and the platen 7,
They are connected by a seal cylinder 8. Further, in order to increase the container sealing force S, the contact portion of the container 5 facing the baffle 3 is narrowed. In a die tool system without the baffle 3, the container 5 directly contacts the die 1 as shown in FIG.

A billet 9 to be extruded is filled in a processing space in a die in a state where a puller 10 is mounted on the tip of an extruded profile 14 and a stem 12 is pressed on a rear end via a dummy block 11. ing. When the pushing force F is applied to the billet 9 by the stem 12, the billet 9
Passes through the bearing surface 13 of the die 1 and is extruded as an extruded profile 14 having a predetermined shape. At this time, the flow of the metal flowing on the bearing surface 13 is controlled by the baffle 3. Reference numeral 20 in FIG. 2 indicates the position of the bearing surface 13 when a die tool system without the baffle 3 is used, and an extruded profile 14 having a predetermined shape is sent out from the bearing surface 20 of the die 1. The bearing surface 13 is usually formed in the die 1 as a slit-shaped opening as shown in FIG. 3 or formed between split dies, and a dug 15 for adjusting the metal flow is provided on the upstream side. Have been. The width of the bearing surface 13 parallel to the extrusion direction is shown in FIG.
As shown in (c), the bearing opening width W is obtained.

In FIG. 2, the container sealing force S is represented by the sum of the tightening force of the seal cylinder 8 and the shearing frictional force of the aluminum alloy generated on the inner wall of the container 5. When the container 5 and the platen 7 are clamped by the seal cylinder 8 so as to be sandwiched therebetween, the clamping force by the seal cylinder 8 acts in parallel with the pushing direction. And the stem 12
When the billet 9 is pushed by the pushing force F via the dummy block 11, the shear frictional force of the aluminum alloy acts on the inner wall of the container 5 at the boundary surface between the billet 9 and the container 5 in parallel with the pushing direction. The container sealing force S synthesized by the tightening force and the shear friction force prevents the aluminum alloy from seeping out from the mating surface of the baffle 3 and the container 5 and acts on the die 1 via the baffle 3. In the present invention, the taper for the are provided T, container sealing force S is the direction of extrusion load component force F _a and the extrusion direction vertical plane die center direction load component in the tapered surface between the die 1 and the die holder 2 Decomposed into force _Fr. The load component force _Fr is large at the start of pushing, and thus acts to reduce the bearing opening width W. When the billet 9 is extruded, an extruding force F is applied from the stem 12. Extrusion force F is received by the platen 7, in addition to the shearing frictional forces of the aluminum alloy caused the inner wall of the container 5, made of aluminum alloy, the shape of the extruded shape member, even extrusion force W _f determined by the extrusion conditions min Is forced.

[0010]

In the extrusion using such a die tool system, process parameters such as a die temperature (thermal strain), an extrusion working force W _f , and a container sealing force S affect the bearing opening width W as follows. . (1) Die Temperature (Thermal Distortion) The temperature T _{1 of the} bearing portion increases from the start to the end of pushing. The degree of temperature rise is greater than in other parts of the die. That is, the die has a lower temperature T ₂ of the outer peripheral portion, the displacement due to thermal expansion of the die is concentrated on the bearing opening, the displacement occurs to narrow the bearing opening width W.
As shown in FIG. 4A, the degree of the displacement increases in the negative direction of Δd according to the temperature rise from the start to the end of the pressing, and as a result, the bearing opening width W decreases.
Therefore, temperature change during one push (thermal strain)
Acts as a factor for reducing the thickness of the extruded profile 14.

[0011] (2) extrusion force W _f extrusion force W _f is mainly acts as a pressure load parallel to the extrusion direction, acting perpendicular to the die surface. This power
In addition to supporting and fixing the die, the metal acts to increase the bearing opening width W by flowing metal, that is, Δd acts in a positive direction. In general, the deformation resistance of the billet 9 is higher at the start of pressing than at the end of pressing because the metal temperature is low at the start of pressing and high at the end of pressing. Therefore, the extrusion force W _f, greater than the end push near the beginning press as shown in FIG. 4 (2). Therefore, the extrusion force W _f
Acts in the direction of reducing the bearing opening width W from the start to the end of the pushing, in other words, the thickness of the extruded profile.

(3) Container Sealing Force S The components of the container sealing force S are the tightening force by the seal cylinder 8 and the shearing frictional force of the aluminum alloy generated on the inner wall of the container 5. Generally, the clamping force by the seal cylinder 8 is constant during the extrusion. On the other hand, the shear friction decreases as the extrusion proceeds. As a result, the container sealing force S decreases from the start of pushing to the end of pushing according to the decrease in the shearing frictional force of the aluminum alloy generated on the inner wall of the container 5. Therefore, FIG.
(3) As shown in, it decreases toward the end pressing the start push load component force F _r towards the die center direction within a plane perpendicular to the extrusion direction, from the results begin pushing force to narrow the bearing aperture width W as It becomes smaller toward the end of the push. Accordingly, the bearing opening width W increases from the start to the end of the pushing, and the thickness of the extruded profile 14 tends to increase.

As described above, during one push, the die temperature (1) and the extrusion processing force W _f (2) act as factors that reduce the thickness of the extruded profile from the start to the end of the push. On the other hand, container sealing force S (3)
Acts as a factor to increase the wall thickness. The present invention considers the effect of each such process parameter,
Assuming that the process parameters change, the change in the thickness of the extruded product is suppressed by combining the effects of the changing process parameters on the displacement of the bearing opening. In this respect, the basic technical idea is different from that in which the variation width of each process parameter is reduced and thickness variation is suppressed. That is, in the present invention, by tapering T to die tool system, as shown in FIG. 4 (a), parallel component force F _r toward the die center in a vertical plane in the direction of extrusion in the extrusion direction container Generated from the sealing force S. Component force F _r towards the die center, to displace the position of the bearing surface 13 acts to narrow the bearing opening width W. FIG.
Which was attached a clearance G to allow movement of the die 1, as shown in an equal, bearing aperture width W changes even greater by the displacement of the die 1 itself in accordance with the component force F _r.
As a result, the die temperature (1), the extrusion processing force W _f
(2), the displacement of the bearing opening is synthesized by the influence of a factor that varies the bearing opening width W such as the container sealing force (3), and the position of the bearing surface 13 is pushed from the beginning to the end as shown in FIG. , The position is kept at ± 0, and as a result, the thickness of the extruded profile 14 hardly fluctuates.

[0014] taper T die tool system, as long as the component force F _r towards the die center needed to obtain a condensed diameter or toward the extrusion direction forward may be any taper whose diameter increases. The angle θ of the taper T is appropriately determined according to the size and material of the die, extrusion conditions, and the like. Component force F _r toward the die center direction is increased by slidable either die components in contact via the taper T. Therefore, it is preferable to provide the clearance G on the contact surface perpendicular to the extrusion direction. Tool part is moved parallel to the extrusion direction by the clearance G, further generates a large component force F _r the tapered surface toward the die center direction in the extrusion direction vertical plane. Accordingly, the movable tool is larger displacement and / or elastic deformation, narrowing the bearing opening width W effectively is combined with the displacement due to the displacement and extrusion force W _f by die temperatures, resulting meat extruded profiles It is controlled to keep the thickness constant.

When the movable tool is pushed to the full clearance G, the maximum deformation occurs on the tapered surface.
This state corresponds to the start of pushing. In other words, the maximum shear frictional forces of the aluminum alloy is produced on the inner wall of the container 5, thus the container sealing force S is maximized, component force F _r is maximum toward the die center direction. Therefore, it works to minimize the bearing opening width W. At this time, the degree of the clearance G is determined by the extrusion processing force W depending on the shape of the extruded shape member 14.
_The optimum value is determined according to the size of _{f and} the displacement due to the die temperature. In a die tool system provided with a clearance G, the tool parts are easy to slip along the tapered surface.
It is preferable to impart lubricity to the surface of the relatively sliding tool component. The tool part provided with lubricity is easily pushed in the pushing direction at the beginning of pushing, and exerts the effect of the clearance G to the maximum. Further, since the shear frictional force of the aluminum alloy generated on the inner wall of the container 5 with the progress of the extrusion decreases, the elastic deformation of the die 1 decreases, and the die 1 is easily restored according to the shearing frictional force. as a result,
The thickness of the extruded profile 14 hardly fluctuates.

As described above, in order to make the action of suppressing the wall thickness fluctuation work continuously and smoothly, the frictional force on the tapered surface is reduced by increasing the lubricity. As a means for imparting lubricity to the tool component, a method of reducing the surface roughness of the tapered surface, a method of applying a lubricant, and the like are employed. The sliding surface can be changed according to the position of the clearance G. As shown in FIGS. 12B and 13B, a sliding surface other than the tapered surface may be provided on the contact surface of the die holder 2 and the backup die 4. It is possible. On the other hand, in the conventional die tooling system, no component force F _r is toward the die center direction as shown in Figure 5 (a). Therefore, die temperature (thermal strain)
And extrusion force W _f, respectively 5 (1) - (2)
And the bearing surface is displaced. On the other hand, the container sealing force S does not act on the bearing surface as shown in FIG. Therefore, the displacement Δd of the bearing portion synthesized by these factors fluctuates as shown in FIG. 5 (4), which results in fluctuating the thickness of the extruded product.

The taper T to generate the component force F _r toward the die center direction may be formed in various forms.
FIG. 6 shows a case in which a taper T is formed on the die 1 and an inclined surface is formed on a part of the die holder 2 facing the taper T. When the diameter of the die 1 is reduced in the extrusion direction indicated by the arrow (a,
b) The container sealing force S is applied to the die 1 via the baffle 3. The clearance G for sliding the die 1 along the tapered surface may be formed between the backup die 4 and the bolster 6 (a) or between the die 1 and the backup die 4 (b). In the case where the die 1 is enlarged in the extrusion direction (c), the container sealing force S is applied to the die holder 2.

The taper T is, as shown in FIG.
Can also be attached. When the diameter of the die 1 is reduced in the extrusion direction indicated by the arrow (a, b), the container sealing force S is applied to the die 1 via the baffle 3. Die 1
The clearance G that slides along the tapered surface is
It may be formed either between the backup die 4 and the bolster 6 (a) or between the die 1 and the backup die 4 (b). Further, in the case where the diameter of the die 1 is expanded in the extrusion direction (c), the container sealing force S is reduced by the die holder 2.
Is added to FIG. 8 shows that the taper T is
This is the case when attached to. Also in this case, the container sealing force S is applied to the baffle 3 in the taper (a) that reduces the diameter in the extrusion direction, and the container sealing force S is applied to the die holder 2 in the taper (b) that increases the diameter in the extrusion direction. FIG.
Shows a case in which a taper T is attached to the die 1, the baffle 3 and the backup die 4. Also in this case, in the taper (a) that reduces the diameter in the extrusion direction, the container sealing force S is applied to the baffle 3, and the taper (b) increases in the diameter in the extrusion direction.
Then, a container sealing force S is applied to the die holder 2.

As the die holder 2, a holder having a length surrounding only the die 1 as shown in FIG. 10 can be used. In this case, a clearance G is provided between the die holder 2 and the backup die 4 so that the die holder 2 can slide in the pushing direction. The baffle 3 has a straight outer surface (a) and a tapered outer surface (b). Further, as shown in FIG. 11, a tapered ring 16 can be arranged between the die 1 and the die holder 2. Clearance G at tip of tapered ring 16
The clearance G allows the tapered ring 16 to slide in the pushing direction. Also in this case, as the die holder 2, a die having a length corresponding to the total length of the die 1 and the backup die 4 (a) and a die having the same length as the die 1 (b) are used. In the die tool system without the baffle 3, the container 5 is brought into direct contact with the die 1 (a) or the die holder 2 (b) as shown in FIG. Further, it is possible to make the baffle 3 move integrally with the die 1. FIG. 13 shows wedge 17
In this case, there is a method (a) for bringing the container 5 into contact with the baffle 3 and a method (b) for bringing the container 5 into contact with the die holder 2. FIG. 14 shows a method in which the die 1 and the baffle 3 are engaged with each other by the spigot 18. In this case, too, the method (a) of bringing the container 5 into contact with the baffle 3 and the method of bringing the container 5 into contact with the die holder 2 ( b). The die tool system shown in FIGS. 13 and 14 is used to extrude a hollow material, and a mandrel is set in a baffle space 21 which is located at a position beside the baffle 3.

[0020]

EXAMPLE A die 1, a die holder 2, a baffle 3 and a backup die 4 are shown in FIG.
A die tool system having a combined structure as shown in (a) and (b) was used. On the mating surface of the die 1 and the die holder 2, a taper T having an angle θ = 20 degrees to reduce the diameter in the extrusion direction was formed. Then, the die 1 passes through the tapered surface.
In addition, a release agent was applied so that the die holder 2 became relatively slippery. The clearance G between the backup die 4 and the bolster 6 was designed to be 0.2 mm.
A cylindrical billet having a diameter of 280 mm and a length of 470 mm was produced from the aluminum alloy 6063 and was preheated to 480 ° C. prior to extrusion. And, at 2900 tons,
An extruded section having the cross-sectional shape shown in Table 1 was produced. At each push, the wall thickness of the cross section of the extruded profile was measured at the start and end of the extrusion of the extruded product, and the change in thickness according to the number of pushes was investigated. The pushing start part for measuring the wall thickness was set at the leading end position of the extruded product, and the pushing end part was set at the rear end position of the extruded product.

As shown in FIG. 16 showing the results of the investigation,
Although the thickness of the extruded product tends to decrease as the number of pushes increases, the push start portion and the push end portion have substantially the same thickness for each push. When this thickness was compared with the bearing opening width W, the thickness of the extruded product was smaller than the bearing opening width W. This is presumed that the taper T acts in a direction in which the bearing opening width W becomes narrower than before the extrusion. On the other hand, when a conventional extrusion die having no taper T is used, as shown in FIG. 16, the difference between the thickness of the push start portion and the thickness of the push end portion is large for each push, and the thickness accuracy is reduced. An inferior extruded product was obtained. As is clear from this comparison, by exerting a component force toward the center of the die on the die 1, the effects on the bearing opening displacement, such as the die temperature (thermal strain), the extruding force, and the container sealing force, are synthesized, and each push is performed. It was confirmed that an extruded product having a constant wall thickness was obtained each time.

[0022]

As described above, in the extrusion die of the present invention, the tapering of the die causes the clamping force applied by the seal cylinder and the shear frictional force of the aluminum alloy generated on the inner wall of the container. The structure is such that a load component force directed toward the die center in a plane perpendicular to the extrusion direction is obtained from the container sealing force. Due to this load component force, die temperature (thermal strain),
By combining the displacement of the bearing surface due to the process parameters of the extrusion processing force and the container sealing force as a whole and controlling the displacement to zero, the displacement of the bearing opening caused by the fluctuation of the individual process parameters during extrusion, As a result, the thickness variation between the pushing start portion and the pushing end portion of the extruded product for each push is suppressed. As a result, a high-quality extruded product having substantially no difference in wall thickness between the pressing start portion and the pressing end portion is manufactured.

[Brief description of the drawings]

FIG. 1 is a graph showing a variation in the thickness of an extruded profile according to the number of pushes.

FIG. 2 is a partial cross-sectional view of a dice tool system tapered in accordance with the present invention.

FIG. 3 is a partial perspective view (a), a sectional view (b), and an enlarged sectional view (c) of a bearing portion of a die tool system according to the present invention.

FIG. 4 is an explanatory view showing that the thickness of an extruded product does not fluctuate when a die structure according to the present invention is used, and shows a force (a) acting on each part of a die tool system and a change in die temperature. And the accompanying displacement of the bearing (1), the change in the extrusion force and the accompanying displacement of the bearing (2),
A graph showing the change in the component force toward the center of the die and the displacement (3) of the bearing portion accompanying the change in the component force and the displacement (4) of the bearing portion in which the displacements (1) to (3) are combined.

FIG. 5 is an explanatory view showing that the thickness of an extruded product is changed when a conventional die structure is used. FIG. 5 shows the force (a) acting on each part of the die tool system, the change in die temperature, and the accompanying change. Displacement of bearing part (1), change of extrusion processing force and displacement of bearing part accompanying it (2), container sealing force and displacement of bearing part (3) and (1) to (3)
Graph showing the displacement (4) of the bearing part where the displacement of the bearing is synthesized

FIG. 6 shows a structure in which a taper is applied to the outer peripheral surface of the die, in which a clearance is provided between the backup die and the bolster, a structure in which a clearance is provided between the die and the backup die, and a die. Structure with clearance between holder and bolster (c)

FIG. 7 shows a structure in which the outer peripheral surfaces of a die and a baffle are tapered to provide a clearance between a backup die and a bolster (a), and a structure in which a clearance is provided between a die and a backup die (b). And structure with clearance between die holder and bolster (c)

FIG. 8 shows a structure in which a clearance is provided between the backup die and the bolster, and a structure in which a clearance is provided between the die holder and the bolster (b).

FIG. 9 shows a structure in which a clearance is provided between a backup die and a bolster (a) and a structure in which a clearance is provided between a die holder and a bolster (b) in which a die, a baffle, and a backup die are tapered. )

FIG. 10 shows a structure in which a taper for expanding the diameter of the die is attached to the die and the die holder in the front of the extrusion direction, and the baffle has no taper (a) and the baffle has a taper (b).

FIG. 11 shows a structure using a tapered ring, in which a die holder is received by a bolster (a) and a structure in which the die holder is received by a backup die (b).

FIG. 12 shows a die tool system without a baffle, in which the container is in direct contact with the die (a) and the container is in contact with the die holder (b).

FIG. 13 shows a die tool system in which a die and a baffle are connected by a wedge, and a structure in which a container is in contact with a baffle (a) and a structure in which a container is in contact with a die holder (b).

FIG. 14 shows a die tool system in which a die and a baffle are integrated with a spigot, and a structure in which a container is in contact with a baffle (a) and a structure in which a container is in contact with a die holder (b).

FIG. 15 is a cross-sectional shape of an extruded product manufactured in an example of the present invention.

FIG. 16 is a graph showing the effect of the taper applied to the die on the difference in wall thickness between the extrusion start portion and the extrusion end portion of the extruded product.

[Explanation of symbols]

1: Die 2: Die holder 3: Baffle
4: Backup die 5: Container 6: Bolster 7: Platen
8: Seal cylinder 9: Billet 10: Puller 11: Dummy block 12: Stem 13: Bearing surface 14: Extruded profile 15: Drilling 16: Tapered ring 17: Wedge
18: Inlay 20: Bearing surface without baffle 21: Baffle space T: Taper G: Clearance θ: Angle of taper W: Bearing opening width S: Container sealing force F: Extrusion force: Tightening force by seal cylinder: Container shearing friction of the aluminum alloy caused the inner wall F _a: extrusion direction load component force W _f: extrusion force F _r: the extrusion direction vertical plane die center direction load component force

Claims (6)

(57) [Claims] 1. A tape whose outer peripheral surface is reduced in diameter in the extrusion direction.
Die with a bearing surface and a die.
With a surrounding die holder, the container sealing force is
Characterized in that it can be added to the die via contact or baffle
Extrusion die. 2. A tape whose outer peripheral surface expands in the extrusion direction.
Die with a bearing surface and a die.
Between the surrounding die holder and the die
With an inserted tapered ring
Characterized in that a container sealing force is applied to the ring
Extrusion dies. 3. A taper according to claim 1, wherein
Reduced frictional resistance by smoothing or applying lubricant.
Extrusion die. 4. The outer peripheral surface of the die is reduced in diameter in the extrusion direction.
4. The dice according to claim 1, wherein the die is tapered.
Between the die and the backup die or the backup die.
Between the b and the bolster in a plane perpendicular to the extrusion direction.
Extrusion dies with clearance. 5. The outer peripheral surface of the die expands in the extrusion direction.
4. The dice according to claim 2, wherein the die is tapered.
Between the die holder and the backup die or
A plane perpendicular to the extrusion direction between the rudder and the bolster
Extrusion die with clearance inside. 6. A tip of a tapered ring according to claim 2.
The clearance between the die and the die holder.
Die for girder extrusion molding.