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Device for manufacturing a metal profile

Imported: 24 Feb '17 | Published: 28 Oct '03

Miroslaw Plata, Christophe Bagnoud, Gregoire Arnold, Martin Bolliger

USPTO - Utility Patents

Abstract

An extrusion device for manufacturing a profile from an extrusion block (

36), which is at least in part of metallic material, contains a container (

10) with container bore (

12) to accommodate an extrusion block (

36), a stem (

32), a shaping chamber and/or a shaping die (

18) and a heating facility (

25) arranged between the container bore (

12) and the die (

18). The heating facility (

25) contains a heating chamber (

22) in the form of a hollow metal tube featuring at least a first and a second heating section (

22

a,

22

b) with heating chamber walls (

26

a,

26

b) and means (

30) for inductively heating the heating chamber walls (

26

a,

26

b). The first heating section (

22

a) exhibits a larger cross-sectional diameter than the—with respect to the direction of extrusion x—second heating section (

22

b), forming thereby a step-like narrowing in cross-section.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in greater detail in the following and with reference to the accompanying drawings. These show:

FIG. 1

a: a cross-section through a section of an extrusion press device according to the invention;

FIG

1

b: a graphic representation of the change in extrusion force P and the fraction LF of block material in the liquid state within the extrusion press device.

Claims

1. An extrusion press device for manufacturing a profile from an extrusion block (

36) of a material that is at least in part metallic, whereby the extrusion press device (

5) contains a container (

10) with a container bore (

12) for accommodating the extrusion block (

36), a stem (

32), a shaping means (

18) and a heating facility (

25) situated between the container bore (

12) and the shaping means, the improvement comprising:

2. A device according to claim 1, wherein the heating chamber (

22) is in the form of a hollow metallic body and the heating facility (

25) contains means (

30) for inductively heating the heating chamber walls (

26

a,

26

b).

3. A device according to claim 2, wherein the means (

30) for heating comprises induction coil windings around the heating chamber wall.

4. A device according to claim 1, wherein the cross-sectional diameter of the heating chamber section (

22

a) following on from the container bore (

12) is substantially the same as the cross-sectional diameter of the container bore (

12).

5. A device according to claim 1, wherein the heating chamber (

22) is comprised of two heating sections (

22

a,

22

b) and the length of the first heating section (

22

a) is about ⅔ of the overall length of the heating chamber and the length of the second heating section (

2

b) of smaller cross-section is about ⅓ of the overall length of the heating chamber.

6. A device according to claim 1 wherein the cross-sectional diameter of the second heating section (

22

b), following immediately after a first heating section (

22

a) with respect to the direction of extrusion x, is 5 to 40% smaller than the cross-sectional diameter of the heating section (

22

a) situated upstream.

7. A device according to claim 1, wherein the cross-sectional diameter of the second heating section (

22

b), following immediately after a first heating section (

22

a) with respect to the direction of extrusion x, is 15 to 30% smaller than the cross-sectional diameter of the heating section (

22

a) situated upstream.

8. A device according to claim 1, wherein the cross-sectional diameter of the second heating section (

22

b), following immediately after a first heating section (

22

a) with respect to the direction of extrusion x, is 20 to 30% smaller than the cross-sectional diameter of the heating section (

22

a) situated upstream.

9. A device according to claim 1, wherein the heating chamber (

22) is a hollow metal tube.

10. A device according to claim 9, wherein the metal is selected from the group consisting of steel and chromium steel.

11. A device according to claim 1, wherein the cross-sectional shape of at least the heating chamber section adjacent to the shaping means (

18) is about the cross-sectional shape of the profile to be produced, and the first heating chamber section corresponds to the cross-sectional shape and diameter of the container bore and the second heating chamber section adjacent the shaping means with respect to the direction of extrusion x, has a stepwise cross-sectional shape which tapers to about the cross-section dimension of the cross-section of the profile.

12. A device according to claim 1, wherein the container bore (

12) and at least a portion of the heating chamber (

22) is clad with heat resistant insulation (

14).

13. A device according to claim 1, wherein an inner wall of the heating chamber facing the extrusion block material includes relief structures in the form of grooves or ribs running essentially in the direction of extrusion x.

14. A device according to claim 13, wherein grooves or ribs run in a spiral manner.

15. A device according to claim 1, further including means for cooling the metal profile (

40) emerging from the shaping means to produce complete vaporisation of coolant applied to the metal profile (

40).

16. A device according to claim 15, further including a pulling facility (

44) to apply a tensile force (k) to the profile (

40).

17. A process for manufacturing a profile (

40) from an extrusion block (

36) of a material that is at least in part metallic employing the device according to claim 1, including introducing the extrusion block (

36) into the bore (

12) of a container (

10) and pressed by a stem (

32) under compressive force through a shaping means (

18) into a profile (

40) and, prior to extrusion, the extrusion block material is pre-heated, the process including:

18. A process according to claim 17, wherein the extrusion block material is pre-heated and brought into a part-solid/part-liquid state and the extrusion block material on entering the shaping means contains a liquid phase fraction of at most 70%.

19. A process according to claim 18, wherein the extrusion block material is pre-heated and brought into a part-solid/part-liquid state and the extrusion block material on entering the shaping means contains a liquid phase fraction between 20-60%.

20. A process according to claim 18, wherein the extrusion block material is pre-heated and brought into a part-solid/part-liquid state and the extrusion block material on entering the shaping means contains a liquid phase fraction between 40-50%.

21. A process according to claim 17, including cooling the profile (

40) on leaving the shaping means (

18).

22. A process according to claim 17, forming the extrusion block (

36) of an alloy selected from the group consisting of a thixotropic alloy of aluminum or magnesium and a non-thixotropic hard alloy of aluminum or magnesium.

23. A process according to claim 17, including extruding the extrusion block material into a profile in a pre-heated state in a shaping chamber, passed through a cooled mould and stabilised, and passed through a die and given its final shape.