Method for the production of a rim hole in hollow profiles

1. A method for production of a rim hole in a hollow profile comprising:

punching two opposite holes out of a hollow profile, at least one of the two holes having a diameter which is smaller than that of the rim hole to be produced, by interaction of a perforating die pushed into the hollow profile, and two opposite perforating punches between which the hollow profile lies,

pushing a tubular piece into an interior of the hollow profile in such a way that the tubular piece coaxially surrounds the location of the rim hole to be produced and comes to lie there coaxially to a common axis of the opposite holes, and

drawing hollow profile material of of a section the hollow profile located between an edge of at least one of the opposite holes and an inside of the tubular piece into the hollow profile interior by at least one punch until said hollow profile material bears flat against the inside of the tubular piece so as to form the rim hole.

2. The method as claimed in claim 1 , wherein the drawing operation is effected by a follow-on contour of the punch adjoining a cutting edge formed on an end face of the punch.

3. The method as claimed in claim 2 , wherein the two opposite holes are the same size.

4. The method as claimed in claim 1 , wherein the two opposite holes are the same size.

5. A method for production of a rim hole in a hollow profile comprising:

punching two opposite holes out of a hollow profile, at least one of the two holes having a diameter which is smaller than that of the rim hole to be produced, by interaction of a perforating die pushed into the hollow profile, and two opposite perforating punches between which the hollow profile lies,

pushing a tubular piece into an interior of the hollow profile in such a way that the tubular piece coaxially surrounds the location of the rim hole to be produced and comes to lie there coaxially to a common axis of the opposite holes, and

drawing hollow profile material of of a section the hollow profile located between an edge of at least one of the opposite holes and an inside of the tubular piece into the hollow profile interior by at least one punch until said hollow profile material bears flat against the inside of the tubular piece so as to form the rim hole,

wherein the hollow profile material of the hollow profile section is drawn into a recess of the tubular piece which encircles in an annular manner, and is open toward an end face of the tubular piece.

6. The method as claimed in claim 5 , wherein the hollow profile material is drawn in such a way that the hollow profile material engages behind undercut surfaces of the recess of the tubular piece.

7. The method as claimed in claim 6 , wherein the two opposite holes are the same size.

8. The method as claimed in claim 6 , wherein the two opposite holes are holes of different sizes, wherein a larger hole of the opposite holes is dimensioned in such a way that its hole edge terminates flush with the inside of the tubular piece, and wherein the hollow profile material is drawn in only on a side of a smaller hole of the opposite holes, the hole diameter and the hollow profile section being dimensioned in such a way that the hollow profile section extends across the entire length of the tubular piece after the drawing operation.

9. The method as claimed in claim 5 , wherein the two opposite holes are the same size.

10. The method as claimed in claim 5 , wherein the two opposite holes are holes of different sizes, wherein a larger hole of the opposite holes is dimensioned in such a way that its hole edge terminates flush with the inside of the tubular piece, and wherein the hollow profile material is drawn in only on a side of a smaller hole of the opposite holes, the hole diameter and the hollow profile section being dimensioned in such a way that the hollow profile section extends across the entire length of the tubular piece after the drawing operation.

11. A method for production of a rim hole in a hollow profile comprising:

punching two opposite holes out of a hollow profile, at least one of the two holes having a diameter which is smaller than that of the rim hole to be produced, by interaction of a perforating die pushed into the hollow profile, and two opposite perforating punches between which the hollow profile lies,

pushing a tubular piece into an interior of the hollow profile in such a way that the tubular piece coaxially surrounds the location of the rim hole to be produced and comes to lie there coaxially to a common axis of the opposite holes, and

drawing hollow profile material of of a section the hollow profile located between an edge of at least one of the opposite holes and an inside of the tubular piece into the hollow profile interior by at least one punch until said hollow profile material bears flat against the inside of the tubular piece so as to form the rim hole, wherein the two opposite holes are holes of different sizes,

wherein a larger hole of the opposite holes is dimensioned in such a way that its hole edge terminates flush with the inside of the tubular piece, and

wherein the hollow profile material is drawn in only on a side of a smaller hole of the opposite holes, the hole diameter and the hollow profile section being dimensioned in such a way that the hollow profile section extends across the entire length of the tubular piece after the drawing operation.

12. A method for production of a rim hole in a hollow profile comprising:

punching two opposite holes out of a hollow profile, at least one of the two holes having a diameter which is smaller than that of the rim hole to be produced, by interaction of a perforating die pushed into the hollow profile, and two opposite perforating punches between which the hollow profile lies,

pushing a tubular piece into an interior of the hollow profile in such a way that the tubular piece coaxially surrounds the location of the rim hole to be produced and comes to lie there coaxially to a common axis of the opposite holes, and

drawing hollow profile material of of a section the hollow profile located between an edge of at least one of the opposite holes and an inside of the tubular piece into the hollow profile interior by at least one punch until said hollow profile material bears flat against the inside of the tubular piece so as to form the rim hole,

wherein the drawing operation is effected by a follow-on contour of the punch adjoining a cutting edge formed on the end face of the punch, and

wherein the hollow profile material of the hollow profile section is drawn into a recess of the tubular piece which encircles in an annular manner, and is open toward an end face of the tubular piece.

13. The method as claimed in claim 12 , wherein the hollow profile material is drawn in in such a way that the hollow profile material engages behind undercut surfaces of the recess of the tubular piece.

14. The method as claimed in claim 13 , wherein the two opposite holes are the same size.

15. The method as claimed in claim 13 , wherein the two opposite holes are holes of different sizes, wherein a larger hole of the opposite holes is dimensioned in such a way that its hole edge terminates flush with the inside of the tubular piece, and wherein the hollow profile material is drawn in only on a side of a smaller hole of the opposite holes, the hole diameter and the hollow profile section being dimensioned in such a way that the hollow profile section extends across the entire length of the tubular piece after the drawing operation.

16. The method as claimed in claim 12 , wherein the two opposite holes are the same size.

17. The method as claimed in claim 12 , wherein the two opposite holes are holes of different sizes, wherein a larger hole of the opposite holes is dimensioned in such a way that its hole edge terminates flush with the inside of the tubular piece, and wherein the hollow profile material is drawn in only on a side of a smaller hole of the opposite holes, the hole diameter and the hollow profile section being dimensioned in such a way that the hollow profile section extends across the entire length of the tubular piece after the drawing operation.

18. A method for production of a rim hole in a hollow profile comprising:

punching two opposite holes out of a hollow profile, at least one of the two holes having a diameter which is smaller than that of the rim hole to be produced, by interaction of a perforating die pushed into the hollow profile, and two opposite perforating punches between which the hollow profile lies,

pushing a tubular piece into an interior of the hollow profile in such a way that the tubular piece coaxially surrounds the location of the rim hole to be produced and comes to lie there coaxially to a common axis of the opposite holes, and

drawing hollow profile material of of a section the hollow profile located between an edge of at least one of the opposite holes and an inside of the tubular piece into the hollow profile interior by at least one punch until said hollow profile material bears flat against the inside of the tubular piece so as to form the rim hole,

wherein the drawing operation is effected by a follow-on contour of the punch adjoining a cutting edge formed on the end face of the punch,

wherein the two opposite holes are holes of different sizes,

wherein a larger hole of the opposite holes is dimensioned in such a way that its hole edge terminates flush with the inside of the tubular piece, and

wherein the hollow profile material is drawn in only on a side of a smaller hole of the opposite holes, the hole diameter and the hollow profile section being dimensioned in such a way that the hollow profile section extends across the entire length of the tubular piece after the drawing operation.