CH314396A - Process for the manufacture of a profiled metal tube and tube obtained by this process - Google Patents
Process for the manufacture of a profiled metal tube and tube obtained by this processInfo
- Publication number
- CH314396A CH314396A CH314396DA CH314396A CH 314396 A CH314396 A CH 314396A CH 314396D A CH314396D A CH 314396DA CH 314396 A CH314396 A CH 314396A
- Authority
- CH
- Switzerland
- Prior art keywords
- tube
- manufacture
- metal tube
- profiled metal
- profiled
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
- B21C37/202—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with guides parallel to the tube axis
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Description
<B>Procédé pour la</B> fabrication <B>d'un tube</B> métallique profilé <B>et tube obtenu par ce procédé</B> Dans le cas d'arbres qui transmettent un effort de torsion et dont les distances axiales varient en cours du travail, il est d'usage cou rant d'établir le joint à l'aide d'une gaine d'ac couplement dentée intérieurement qui, de ce fait, peut exécuter dans une certaine mesure un mouvement coulissant. L'application pra tique la plus connue de ce principe est, à côté d'autres, l'arbre de cardan et son fourreau munis d'une denture longitudinale, tels qu'on les utilise pour, l'attaque des véhicules automo teurs.
L'usure de ces éléments est relativement forte et leur durée de vie par conséquent réduite parce que le parachèvement, qui est opéré par découpage de la matière, détruit la structure et l'homogénéité de la surface.
La présente invention a pour objet un pro cédé pour la fabrication d'un tube métallique profilé, caractérisée en ce qu'on forme à l'in térieur d'une ébauche de tube métallique un profilé longitudinal par martelage à froid sans découpage de copeaux métalliques.
L'invention comprend également un tube obtenu par ce procédé.
Le martelage à froid ne comporte aucun découpage de matière, comme il se produit, par exemple, lors du forage, de l'étirage, tour- nage, dégorgeage, etc., avec ce résultat que le métal déplacé, sans changement de la conti nuité des fibres, est sensiblement amélioré, c'est-à-dire condensé et rendu plus homogène, étant en même temps dimensionné avec une résistance extrême.
L'usure naturelle à l'usage est, de ce fait, ralentie et la durée des pièces augmente.
On va maintenant décrire, à titre d'exem ple, une mise en aeuvre du procédé faisant l'objet de l'invention.
Un tube de 28 mm de diamètre, de 4 mm d'épaisseur et de 4 m de longueur, est enfilé sur un mandrin, outil utilisé pour la déforma tion à froid et ayant 23,8 mm de diamètre extérieur et 150 mm de longueur. Le profil de cet outil est le négatif de celui qui doit être formé à l'intérieur du tube. Ce tube est ensuite déplacé axialement sur le mandrin à l'aide d'un dispositif spécial, de manière à obtenir la déformation à froid de sa paroi intérieure.
La vitesse d'avancement est d'environ 1 mètre par minute, de sorte qu'au bout de 4 minutes l'opération est terminée et que le tube profilé intérieurement sort de l'arbre creux de la machine.
Le tube ainsi obtenu a les dimensions suivantes : 26 mm de diamètre, 2 mm d'épais seur, 6 mètres de longueur, et présente 18 nervures intérieures d'environ 2,5 mm de hauteur.
La résistance du tube fini est d'environ 40 % supérieure à celle du tube de départ et sa surface extérieure est polie comme un miroir.
<B> Process for the </B> manufacture <B> of a profiled metal tube </B> <B> and tube obtained by this process </B> In the case of shafts which transmit a torsional force and whose axial distances vary during work, it is common practice to establish the joint using an internally toothed coupling sheath which, therefore, can perform a certain movement sliding. The best-known practical application of this principle is, alongside others, the cardan shaft and its sleeve provided with longitudinal teeth, such as they are used for attacking motor vehicles.
The wear of these elements is relatively high and their lifespan consequently reduced because the finishing, which is carried out by cutting the material, destroys the structure and the homogeneity of the surface.
The present invention relates to a process for the manufacture of a profiled metal tube, characterized in that a longitudinal profile is formed inside a metal tube blank by cold hammering without cutting metal chips. .
The invention also comprises a tube obtained by this method.
Cold hammering does not involve any cutting of material, as occurs, for example, in drilling, drawing, turning, disgorging, etc., with the result that the metal displaced, without changing the conti nuance of fibers, is significantly improved, that is to say condensed and made more homogeneous, being at the same time dimensioned with extreme resistance.
The natural wear with use is, therefore, slowed down and the life of the parts increases.
An embodiment of the method forming the subject of the invention will now be described by way of example.
A tube 28 mm in diameter, 4 mm thick and 4 m in length, is threaded onto a mandrel, a tool used for cold deformation and having 23.8 mm in outer diameter and 150 mm in length. The profile of this tool is the negative of the one to be formed inside the tube. This tube is then moved axially on the mandrel using a special device, so as to obtain the cold deformation of its inner wall.
The forward speed is about 1 meter per minute, so that after 4 minutes the operation is finished and the internally profiled tube comes out of the hollow shaft of the machine.
The tube thus obtained has the following dimensions: 26 mm in diameter, 2 mm thick, 6 meters in length, and has 18 internal ribs of approximately 2.5 mm in height.
The strength of the finished tube is about 40% higher than that of the starting tube, and its outer surface is polished like a mirror.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU314396X | 1952-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH314396A true CH314396A (en) | 1956-06-15 |
Family
ID=19732544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH314396D CH314396A (en) | 1952-09-29 | 1953-09-02 | Process for the manufacture of a profiled metal tube and tube obtained by this process |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH314396A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2459695A1 (en) * | 1979-06-25 | 1981-01-16 | Mannesmann Ag | METHOD FOR MANUFACTURING ARTICULATED TREES HAVING DENTURES FROM TUBES |
-
1953
- 1953-09-02 CH CH314396D patent/CH314396A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2459695A1 (en) * | 1979-06-25 | 1981-01-16 | Mannesmann Ag | METHOD FOR MANUFACTURING ARTICULATED TREES HAVING DENTURES FROM TUBES |
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