MXPA98001793A - Method and device to produce pressure laminated tubes, with internal wall building on the extre - Google Patents

Abstract

The invention relates to a method for producing pressure-laminated tubes (3) with a pressure mandrel (1) and one or more pressure rollers (2), this tube (3) is disposed between the pressure mandrel (1) and the pressure rollers (2) and plastically deformed by means of the force of the applied load of the pressure rollers (2). To produce tubes with end wall thickenings, it is proposed to use in a first working operation, a first pressure mandrel (1a) with a movable head end support (4), so that the rollers (2) of pressure begin in transformation work in the support (4) of end of moving head and work in the direction of the axis of the machine, then the tube (3a) semi-finished is taken from the first mandrel of pressure (1a), in the second working operation the semi-finished tube (3a) is fastened with the wall thickening (5), which has already been produced in a lathe plate (6) (tension shaft or similar), mounted on the pressure laminating machine, and a second pressure mandrel (1b), fastened at the end of the movable head, with an external diameter (d2) corresponding to the internal diameter of the wall thickening, is pushed into the semi-finished tube ( 3a) and then the pressure rollers (2) form the second thickening d e wall from the end of the movable head, in the direction of the end of the axis of the machine

Description

METHOD AND DEVICE FOR PRODUCING PRESSED LAMINATED TUBES. WITH WIDESPREAD OF THE INTERNAL WALL IN THE EXTREMES The invention relates to a method and a device for producing pressure laminated tubes, according to the preamble of claims 1 and 2, respectively. Rotationally symmetrical parts (for example tubes) are required in the structural design of the loaded parts in the construction of vehicles (for example, construction of bicycles / motorcycles) that should be as light as possible, but should have the necessary resistance the twists in the loaded positions. For this purpose, in the tubular structural parts, for example, the ends are reinforced in the interior, the wall thicknesses in the middle part are reinforced in the interior, longitudinal ribs are applied to the interior, or combinations of these are carried out. measurements. Because the external dimensions of these tubular structural parts can not be changed for reasons of structure, they are still partially standardized (for example in the case of bicycles), these measures are basically applied, advantageously, to the inside of the tubular work pieces.

However, these measures for the modification of the internal region of the rotationally symmetrical parts have been known for a long time in the prior art. However, the measures necessary for this purpose are very costly and even now, to some extent, they can not represent, in practice, justifiable costs. In this way, a tubular structural piece for bicycles, with internal thickening of the tube ends on both sides can already be produced at present. However, for this purpose, several expensive traction procedures and on each individual structural part are required. Because the tolerances dependent on the method, according to the method of conventional production of these parts, any advantage in terms of weight can not be used completely, because the area of large tolerances of, for example, irregular walls (differences in the thickness of the wall), since the smallest thickness of the wall should be considered in the structural calculation. The generic patent DE-P 44 46 919 discloses a method for the rotation of the flow of internally engaged parts, in which a work piece is disposed on a press mandrel, this work piece is plastically deformed by means of the force of the loading of the pressure rollers. The joint pressure method and the counter-pressure method are described in detail.

In this aspect, the technology of lamination by pressure allows the maximum use of the advantages of weight, as a result of very small wall thickening, due to the very high levels of hardening of the materials used (steel and alloys). steel, aluminum and aluminum alloys, titanium and titanium alloys, copper and copper alloys, special steels, etc.) that can be obtained and the extremely uniform thickness of the parts produced. In particular, the method allows obtaining excellent surfaces inside the work pieces, that is to say there is very little roughness. This low roughness of the surface guarantees a special protection against cracks, which can be initiated from the internal grips in the case of, for example, an overvoltage. In addition, the method allows high reproducible levels of accuracy. The fluctuations within the work pieces are minimal. The object of the invention is to create a method according to the preamble of claim 1 and an associated device, with which it is possible to produce tubes that are pressure laminated in a cost-friendly manner and with an exact tolerance and that have thickening of the internal wall at the ends. According to the invention, the object is achieved using, in a first working operation, a first press chuck, with a movable head end support, by pressure rollers that begin their transformation work on the movable head end support and work in the machine axis direction, and the semi-pipe finished being subsequently taken from the first press mandrel and this tube semi-finished at the end with a wall thickening, which has already been produced, being subjected in a second working operation on a lathe plate (tension axis or similar) mounted on the pressure laminating machine, and a second press chuck secured to the movable head end and having an outer diameter corresponding to the internal diameter of the wall thickness, being pushed into the semi-finished pipe, and by the pressure rollers subsequently forming the second wall thickening from the movable head end, in the side direction of the machine shaft. By means of this method, it is possible to produce a tube with thickening of the inner wall at the ends, which uses a simple resource. In the pressure laminating machine, only a second press mandrel attached to the movable head end is required. According to the invention, the external diameter of the first press mandrel corresponds to the desired internal diameter of the non-thickened middle region of the finished tube, and the external diameter of the support corresponds to the desired internal diameter of the wall thickenings.

In a preferred embodiment, the press mandrel and / or the support are provided on the outside with a profile. This profile can also only be applied to certain sections and advantageously comprises ribs and grooves. However, any other conceivable profile is possible. In a specific embodiment, the press mandrel and / or the support are at least partially polygonal in cross section, for example a hexagon. Here, the press mandrel, of course, is understood to mean the first or second press mandrels, or both. According to the invention, this method and this device are particularly suitable for producing structural parts for bicycles / motorcycles. Further features of the invention are apparent from the figures, which are described in detail in the following: Figure 1 shows, schematically, the first working operation for producing a tube with thickenings of the end wall; Figure 2 shows in section the semi-finished tube after the first working operation; Figure 3 shows, schematically, the second working operation; Figure 4 shows the finished tube with thickened ends of the end wall; Figure 5 shows the working operation of a tube on a hexagonal press mandrel and the finished tube after work; Figure 6 shows different tubes with different internal profiles; and Figure 7 shows a press mandrel with a profile comprising ribs and grooves. Figure 1 shows, schematically, the first working operation in a pressure rolling machine to produce a tube 3, with thickenings of the end wall. The tube 3 is arranged in a first press mandrel. and plastically deformed by the force of the loading of the pressure rollers 2. The external diameter of the first press mandrel corresponds in this respect to the desired internal diameter of the middle region of the finished tube 3, which is not thickened later. In the first press mandrel, a movable head end support 4 is provided, the external diameter of which corresponds to the desired internal diameter of the thickeners of the end wall of the finished tube 3. As a first working operation, the 2 pressure rollers begin their transformation work on the moving head end support 4 and work in the direction of the machine axis, which is not shown. The advance of the pressure rollers 2 is indicated by the reference symbol 8. Figure 8 shows the semi-finished pipe 3a, produced by means of this working operation with the thickening 5 of the wall of one end produced at said end . The end of the process by the pressure rollers 2 is indicated by the reference symbol 9. After the semi-finished tube 3a is taken from the first press mandrel the, in a second working operation (see Figure 3), the semi-finished tube 3a is fastened on a lathe plate 6 (tension shaft or the like), mounted on the laminating machine at the end with the wall thickening, which has already been produced. Also, a press mandrel Ib, attached to the end of the movable head, is pushed into the semi-finished tube 3a. In this aspect, the second press mandrel Ib has an external diameter d2, which corresponds to the internal diameter of the wall thickening. Subsequently, the pressure rollers 2 form the second wall thickening from the movable head end in the machine axis direction. The end of the process by the pressure rollers 2 is indicated by the reference symbol 12. Figure 4 shows the finished tube 3 with the thickenings of the end wall.

Figure 5a shows a press mandrel 1 having a hexagonal cross section, with a tube 3 being processed by the pressure rollers 2. In Figure 5b, the finished tube 3 is shown. This pressure mandrel 1 can be manufactured in many different modifications. The pressure rollers 2 are always flow rotation rollers. Figures 5 a, b, c show three different tubes 3, each with a different internal contour. Figure 6a shows a tube 3 with a hexagonal cross section, like Figure 5b. Figures 6b, c show a tube with ribs 10 and grooves 11. Figure 7 shows a pressure mandrel 1 with ribs 10 and grooves 11. A multiplicity of variants of these press mandrels and supports, not all of which can be shown Here, they are possible. Cold rolled press parts can be manufactured with different arrangements of the tools described above, to modify the interior of these work pieces. To some extent, the desired modifications within these components can be produced with justifiable costs only with the described tool arrangements. With respect to the bicycle industry, this means that the high-strength and thin-walled parts can be manufactured with the press lamination method, which have good market opportunity in the field of bicycle racing and sports bicycles, as well as against aluminum bicycles. As a result of good wall uniformity, smooth internal surfaces and very high levels of strength with elongation values that are still adequate, it is possible to have thin-walled components which are, therefore, lighter than the components that They are currently used. Also, the described devices allow high levels of reproducible accuracy. In this way, any piece is equal to another, because the deviations in the values are minimal. By means of the variations in the degree of transformation and naturally by means of the modifications in the interior of the parts. The methods allow torques of resistance and forces that are different in part. That is, there is the possibility of individually assigning the place with the greatest deformation to the torques of resistance and appropriate forces. For example, very high forces in one position and very high elongation values in another position can be combined. Finally, the devices allow the production of conical pieces, partially conical pieces, perhaps combined with wall thickenings, which, in part, have different sizes and with ribs or grooves applied in the interior, in a working operation.

All these advantages lead to cost savings in the production of tubular parts, as a result of the modifications described inside these work pieces.

Claims (6)

1. CLAIMS 1. Method for producing pressure laminated tubes, by means of a press mandrel and one or more pressure rollers, this tube is arranged between the press mandrel and the pressure rollers and is plastically deformed by the load force of these pressure rollers, this method is characterized in that: * in a first working operation, a first press mandrel is used, with a movable head end support; * the pressure rollers begin their transformation work on the movable head end bracket and work in the direction of the machine axis; * Next, the semi-finished tube is taken from the first press mandrel; * in a second working operation, the semi-finished pipe is fastened on a lathe plate (tension shaft or similar), mounted on a pressure rolling machine at the end with the wall thickening, which has already been produced, and a second pressure mandrel, attached at the end of the movable head and having an external diameter, which corresponds to the internal diameter of the wall thickening, is pushed into the semi-finished tube; and * next, the pressure rollers form the second wall thickening from the movable head end in the direction of the machine shaft end.
2. 2. Device for carrying out the method according to claim 1, characterized in that the external diameter of the first press mandrel corresponds to the desired internal diameter of the middle region of the tube, which has been thickened, and the external diameter of the support corresponds to the desired internal diameter of the wall thickening.
3. 3. Device, according to claim 2, characterized in that the press mandrel and / or the support are provided with a profile on the outside.
4. 4. Device, according to claim 2 or 3, characterized in that the press mandrel and / or the support have, at least in part, a polygonal cross section.
5. 5. Device, according to claims 2 or 3, characterized in that the profile comprises ribs and grooves.
6. 6. Method and device, according to one of claims 1 to 5, characterized in that this method and this device are used to produce structural parts for bicycles / motorcycles.