JP2000246328A - Aluminum alloy extrusion die sealing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain generation of a burr even an extrusion molding processing under a condition of high extrusion ratio by making a container sealing part to be a concentric circular convex shape against an axial center, and making a flow guide sealing part to be an approximately L shape so as to fit with the convex part. SOLUTION: A container sealing part 12 is made to be a concentric circular convex shape against an axial center and, a flow guide sealing part is made to be an proximately L shape 52 in a manner to fit with the convex part. By making a structure like this, a set of the container and the flow guide is made easily detachable on one side eliminating a position slippage, sealing property is improved, aluminum intrusion pressure is dispersed at a fitting corner part and, generation of a burr is drastically reduced even when an extrusion ratio is drastically high. Thereby, an aluminum alloy extrusion molding processing can be performed successively and, a manufacturing cost is also made to be inexpensive by making an approximately L shape part as a concentric circular shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for sealing a die and a container when an extruded member is formed using an aluminum alloy.

[0002]

2. Description of the Related Art Extruded dies 7, 8 and a flow guide have conventionally been used to form an extruded material using a cylindrical billet made of aluminum or an aluminum alloy (hereinafter referred to as an aluminum alloy) as shown in FIG. 5 is mounted on a die ring 6 and, if necessary, is set together with a bolster 9 on a die sliding device (not shown). The flow guide seal portion 51 and the container seal surface 11 are rubbed in a plane. It has a structure.

Therefore, when an extrusion load of 1800 to 4000 tons is applied to the billet 4 via the stem 2 during extrusion molding, a force acts to cause aluminum to flow out from the gap of the seal portion.

An extrusion ratio of 50 to 15 which is generally widely used
In the range of 0 (the extrusion ratio referred to here is a value obtained by dividing the billet cross-sectional area by the cross-sectional area of the extruded profile), there is no particular problem with the conventional structure. When the burr of the aluminum alloy is generated and the extrusion ratio exceeds 1500, a large burr pops out of the seal portion, and there is a technical problem that the extrusion molding cannot be continued in practice.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an extrusion tool which can be continuously extruded without burrs even when extruding an aluminum alloy at a high extrusion ratio. An object of the present invention is to provide a sealing structure for a container.

[0006]

The container seal portion has a convex shape concentric with the center of the shaft, and the flow guide seal portion has a substantially L-shape 52 so as to be fitted to the convex portion.

[0007] With such a structure, the penetration pressure of aluminum is dispersed at the rubbing corners,
Burrs are significantly reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The container seal portion 12 is formed to have a convex shape concentrically with respect to the center of the shaft, and the flow guide seal portion is formed to have a substantially L-shape so as to be fitted to the convex portion.

At this time, the dimensions a, b, and c are set according to the required sealing performance, and a is set according to the inner diameter of the container and the shape of the port of the extrusion die.

Further, b is preferably in the range of 3.5 to 10 mm. If it is less than 3.5 mm, the sealing effect is small,
If it is not less than mm, the flow of the aluminum alloy is obstructed, and ideally, it is not more than 4.5 mm.

Further, in order to prevent galling between the container and the flow guide in the portion c, a width of about 2 mm and a depth of about 0.2 m
It is desirable to provide a relief of about m.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a seal structure for a flow guide portion based on the present invention will be described below. However, the dimensions can be adjusted without departing from the spirit of the present invention.

The extruder used to continuously extrude 20 billets using a flow guide having a dimension a of 45 mm, a dimension b of 4.0 mm, and a relief having a width of 2 mm and a depth of 0.2 mm in section c was provided. The change in the ram pressure is shown in FIG. 6, but production was possible without any abnormality.

On the other hand, for comparison, when extrusion molding is performed using a flow guide having a conventional seal structure, although there is no difference in ram pressure as shown in FIG. I had to stop.

[0015]

According to the seal structure of the present invention, the set of the container and the flow guide can be easily attached / detached without displacement, while the sealability is improved, and even when the extrusion ratio is extremely high, no burrs are generated. Since the aluminum alloy can be extruded and the substantially L-shaped portion is made concentric, the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 shows a seal structure between a flow guide and a container according to the present invention.

FIG. 2 shows a conventional example of a container and die seal according to the present invention.

FIG. 3 is an enlarged view of a conventional flow guide and a container part according to the present invention.

FIG. 4 is an enlarged view of a seal portion according to the present invention.

FIG. 5 shows a change in ram pressure when extrusion molding is performed with a conventional seal structure.

FIG. 6 shows a change in ram pressure when a seal structure according to the present invention is used.

[Explanation of symbols]

 1 container 3 dummy block

Claims (1)

[Claims] 1. A manufacturing method for extruding and forming an aluminum alloy by a combination of an extrusion tool having an extrusion die and a flow guide set on a die ring and an extruder container, wherein a seal structure between the container and the flow guide includes a container seal portion. Has a protruding portion that is concentric with respect to the center of the shaft, and has a substantially L-shaped portion so that the flow guide seal portion fits into the protruding portion of the container.