DE202013103821U1 - Mandrel element for an aluminum extrusion device - Google Patents

Abstract

A mandrel member for an aluminum extrusion apparatus, wherein the mandrel member is adapted to form, together with a die member of the extrusion apparatus, an aluminum or aluminum alloy hollow extrusion profile in an extrusion process, the mandrel member comprising a base portion and a core portion spaced therefrom, comprising: at least in a state arranged in the extrusion device, located downstream of the base part, the core part comprising a die edge defining an inner edge of the extrusion profile, characterized in that the core part is fixedly connected to the base part by soldering.

Description

The invention relates to a mandrel element for an aluminum extrusion device, wherein the mandrel element is adapted to form, together with a die member of the aluminum extrusion device in an aluminum extrusion process, a hollow extrusion profile of aluminum or an aluminum alloy, the mandrel element comprising a base part and a core part remote therefrom, located downstream of the base part, at least in a state arranged in the aluminum extrusion device, the core part comprising a die edge (bearing) defining an inner edge of the aluminum extrusion profile.

By aluminum extrusion apparatus is meant an extrusion apparatus suitable for extruding aluminum or aluminum alloys to form an extrusion profile of aluminum or an aluminum alloy.

Such a mandrel element (also called mandrel) is well known. The mandrel element is used in an aluminum extrusion device for forming hollow extrusion profiles of aluminum or an aluminum alloy. The aluminum extrusion device comprises a die through which a flowable material mass, for example aluminum or an aluminum alloy, is pressed or pressed. The die determines the final shape of the molded profile. The hollow aluminum extrusion profile has, seen in axial cross-section, an inboard edge (inside of the profile) and an outboard edge (outside of the profile). For forming a hollow profile, therefore, two die parts are needed, a first part (die member) for defining the profile periphery, and a second part (mandrel) for defining the inner edge of the profile.

The material to be pressed is aluminum or an aluminum alloy. Here, a preheated aluminum block, which may consist of different alloys, pressed at high pressure through the steel die. As a result, with a force of up to 600 N per mm ^2, temperatures can rise to 700 ° C. This places high demands on the aluminum extrusion device.

A disadvantage of the known mandrel element is that it is relatively difficult to manufacture. There are high demands on the dimensional accuracy of the mandrel element. For some geometries, the desired result can only be achieved by manual work, which makes the known mandrel element relatively expensive.

The present invention therefore has for its object to provide a mandrel element of the type mentioned, which can be relatively easily and inexpensively, preferably mechanically, produced without the required dimensional accuracy and function are impaired.

To achieve this object, the invention provides a mandrel element, which is characterized in that the core part is fixedly connected by soldering to the base part. According to the invention, the mandrel element is made from at least two loose parts. The two loose parts can be manufactured and processed independently of each other. In general, smaller, individual parts are easily accessible during processing, so that mechanical methods can be used and thus no or at least less manual labor is required. After complete fabrication and machining of the individual parts, they can be relatively easily joined together by brazing to form an integral mandrel element. The mandrel element according to the invention is thereby relatively easy to produce, with dimensional accuracy and reproducibility are ensured, whereby the object is achieved with the present invention.

It is particularly advantageous if the mandrel element is composed of at least two loose parts, wherein the loose parts are made of different materials. It is conceivable that ceramic is used for one or more of the parts. It is also conceivable that steel grades are used.

In one embodiment, the mandrel member includes feeder ports molded into the base member. About these feed openings, the material to be extruded die reach (bearing).

Preferably, the mandrel member includes a tapered portion or throat portion formed by fixedly connected ends of the base portion and the core portion. This tapering section can be formed particularly well by machining the ends of the base part and / or the core part so that it tapers, for example, pointedly or conically. When machining a complete mandrel element, as is common in the prior art, the application of such a narrowing or tapering is relatively difficult and in many cases even impossible.

It is preferable if the mandrel member is formed by a soldering process, for example, a brazing process or a vacuum brazing process.

Of course, it is conceivable that other soldering or welding methods are used.

Incidentally, it is conceivable that the mandrel member comprises a base part and a plurality of core parts. The core parts can be molded and processed separately. It is conceivable that the core parts consist of one or more different materials. It is also conceivable that the core part or the core parts are provided with a protective layer and / or another coating. It is possible that the base part is provided with the same or a different protective layer and / or other coating.

It should be noted that it is known in the art to carry out the mandrel element with exchangeable core parts. Interchangeability requires the use of removable fasteners in the form of bolts and / or screws and associated holes. However, such a construction is relatively complex and certainly not suitable for all geometries of the core parts.

The invention will be explained in more detail below with reference to the description of a preferred embodiment of the extrusion device with a mandrel element according to the invention with reference to the following drawings. Show it:

1 a schematic overview of the extrusion process;

the 2a to 2d Views of an extrusion device with a mandrel element according to the invention;

the 3a to 3c Views of a mandrel element according to the invention.

1 shows a schematic overview of the aluminum extrusion process. In the extrusion process, a flowable material mass 3 (billet), in this case aluminum or an aluminum alloy, in the direction of the arrow A through a die 1 (pressed) or pressed. The matrix 1 includes a die opening 4 , which is shaped such that through the die 1 pressed flowable material 1 to a profile 5 is formed.

2a shows a detail of the aluminum extrusion device 11 with a mandrel element according to the invention 12 (Mandrel). The extrusion device 11 is suitable for forming hollow profiles. The flowable material (billet, not shown) in the form of aluminum or an aluminum alloy flows in the direction of arrow A through the device. It happens successively (from left to right) a so-called guide plate (lead plate) 18 , the spine element 12 , a matrix organ 15 and the so-called carrier (backer) 19 , Such an arrangement of an aluminum extrusion device 11 is known per se to the person skilled in the art.

As in 2 B showing a view of the spine element 12 is better seen, includes the spine element 12 a base part 13 , in the feed openings 33 are formed for the flowable material. Further downstream from the base (see also 2a ) is the core part 23 , In the in 2 B illustrated embodiment, two core parts can be seen.

As 2a shows is the core part 23 so to the height of the Matrizenorgans 15 aligned that the edges 25 of the matrix organ 15 and the core part 23 a die edge 25 (bearing 25 ) form with a profile opening, which determines the final shape of the hollow profile to be extruded in the extrusion process.

2c shows a cross section of a possible extrusion profile, which with the Matrizenorgan 15 and the mandrel element 12 to shape is. The extrusion profile 101 includes a rectangular hollow profile 102 with an internal support wall 103 , so that in the profile two cavities 110 be formed.

2d shows a cross section along the line IId-IId 2 B and thus provides a top view of the in 2a In particular, it is good to see that there are two core parts that are relatively close to each other. Between the two core parts is a cavity 27 formed, through which the material can flow.

The cavities 110 the molded profile 101 are relatively close together. That means the core parts 23 in the 2 B and 2d must also be relatively close to each other. In particular, the processing of the mutually facing portions of the core parts 23 is relatively difficult in the prior art and often requires manual labor, which is cumbersome and expensive.

According to the present invention, the core parts become 23 and the base part 13 individually manufactured and processed, and this core part 23 or these core parts 23 be by soldering to the base part 13 connected, so that an integral mandrel element 12 is formed. As an example, a brazing process or a vacuum brazing process is shown here.

It is particularly advantageous that the core parts 23 and the base part 13 can be made of different materials. The core part 23 may be made of a different material than the base part 13 , For example, it is possible to use ceramic or steel. In addition, it is possible to use relatively difficult-to-process materials, with first processing the loose core parts 23 and the base part 13 can be done and then the parts 13 . 23 be integrally connected with each other.

In the 3a until finally 3c the method for producing the mandrel element according to the invention is shown schematically. 3c shows the base part 13 attached to a downstream section with a taper or narrowing 52 is provided, which runs conically outward. 3c also shows the core part 23 that also has a taper or constriction at an upstream portion 51 having. These ends can be machined easily and accurately by making and machining the parts one at a time. The individual parts can also be made of different or the same materials. It is advantageous, however, that the invention offers the possibility to use different materials in a simple manner.

The 3a and 3b show how the base part 13 and the core part 23 are firmly connected to each other, wherein between the two parts of a connecting seam 40 is formed. 3a shows a plan view, the 2d equivalent. 3b shows a side view, the 2a equivalent. According to the invention, a soldering process is used. Preferably brazing or vacuum brazing is used.

From the 3a and 3b shows that the taper or constriction in the joint 40 is formed. The taper or narrowing shown here, or even the cavity 27 , as in 3a can be seen well, according to the prior art, in which the mandrel element 12 is an integral part and has to be worked on as such, difficult to shape.

It will be apparent to those skilled in the art that the invention described above has been presented in terms of several possible preferred embodiments. However, the invention is not limited to these embodiments. Numerous equivalent modifications are conceivable within the scope of the invention without departing from the scope of the invention as set forth in the appended claims.

Claims (7)

A mandrel member for an aluminum extrusion apparatus, wherein the mandrel member is adapted to form, together with a die member of the extrusion apparatus, an aluminum or aluminum alloy hollow extrusion profile in an extrusion process, the mandrel member comprising a base portion and a core portion spaced therefrom, comprising: at least in a state arranged in the extrusion device, located downstream of the base part, the core part comprising a die edge defining an inner edge of the extrusion profile, characterized in that the core part is fixedly connected to the base part by soldering. A mandrel member according to claim 1, wherein the mandrel member comprises a constriction or taper formed by fixed ends of the base member and the core member. Mandrel element according to claim 1 or 2, wherein the soldering process is a brazing process or vacuum brazing process. Mandrel element according to one of claims 1 to 3, wherein the core part and / or the base part comprises steel. Mandrel element according to one of the preceding claims, wherein the base part is machined. Mandrel element according to one of the preceding claims, wherein the core part is machined. A mandrel member according to claim 5 or 6, wherein the core part and / or the base part comprises a taper or narrowing at one end of the core part and / or at one end of the base part.

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