EP2138250B1 - Method for manufacturing discs for wheels, particularly for commercial vehicles - Google Patents
Method for manufacturing discs for wheels, particularly for commercial vehicles Download PDFInfo
- Publication number
- EP2138250B1 EP2138250B1 EP09163363.6A EP09163363A EP2138250B1 EP 2138250 B1 EP2138250 B1 EP 2138250B1 EP 09163363 A EP09163363 A EP 09163363A EP 2138250 B1 EP2138250 B1 EP 2138250B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- edge
- strip
- pressing
- sheet metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
- B21D53/30—Making other particular articles wheels or the like wheel rims
Description
- The present invention refers to wheels for motor vehicles of the type comprising a rim to which a disc is welded, and concerns in particular a method for manufacturing a disc, of the kind defined in the preamble of
claim 1. - Such a type of method is described in
EP-1867408-A . - The method described in said document provides that the starting strip of sheet metal is bent on its entire extension, and its end portions, correspondingly arched, are brought together and butt welded. The butt welding of such end portions to obtain a cylindrical ring is indeed problematic. The thus obtained cylindrical ring is then directly subjected to a first press-moulding operation, to shape it into a truncated-cone or annular sphere segment. Also this radical change of shape is problematic.
-
JP-2005 000 967 A -
US 1 931 163 A discloses a method of making a hub shell for a wire wheel starting from a rectangular strip of metal. The strip is rounded and its ends are flattened and joined by upset welding. Following the removal of weld flashes and burrs, the thus obtained cylindrical ring is directly subjected to pressing and shaping operations to bring it to a desired final shape. - One purpose of the present invention is therefore that of putting forward an improved method of the type specified above.
- These and other purposes are obtained according to the invention with a method having the features defined in
claim 1. - Further characteristics and advantages of the invention shall become clear in the following detailed description, given simply as an example with reference to the attached drawings, in which:
-
figure 1 is a plan view of a sheet of sheet metal used for making a wheel disc according to the invention; -
figure 2 is a perspective view of a ring obtained by bending and welding the end portions, left on the same plane, of the sheet of sheet metal offigure 1 ; -
figure 3 is a partial side view of the ring shown infigure 2 ; -
figure 4 is a perspective view of a ring obtained starting from that infigure 2 , through an operation of rounding by radial expansion carried out on an axial portion of such a ring; -
figure 5 is a perspective view of an annular shell element obtainable starting from the ring offigure 4 through a pressing operation; -
figures 6 and 7 are perspective views, partially sectioned, which show the tools for two successive pressing operations; -
figure 8 is a perspective view of an annular shell element obtained through operations of flow forming: and -
figure 9 is a perspective view of a wheel disc obtained starting from the shell element offigure 8 , through final shearing operations of openings or windows. - With reference to the drawings, in the method according to the invention the making of a disc of a wheel for a motor vehicle begins with the provision of a strip of sheet metal, indicated with 1 in
figure 1 , having a general shape like an elongated parallelogram, preferably with a rectangular shape, and having an essentially uniform thickness. - In the case of a wheel for a truck or other commercial/industrial vehicles, such a thickness can be, for example, about 8-16 mm.
- The strip of
sheet metal 1 is then shaped: it is mainly bent, leaving however, that its end portions or limbs, indicated with 1a and 1b infigures 1 and 2 , remain level. The end faces of thelimbs strip 1 are brought together, and then welded, on substantially a same plane, so as to make a substantiallycylindrical ring 2, which has a chordal flattened wall portion, formed by the twolimbs - With reference to
figure 3 , the central axis of thering 2 is indicated O, and theflattened limbs - The bringing together, and then the butt welding, of the
end limbs - The mechanical characteristics of the welds thus made have a narrower variation range, with a substantial improvement of the general quality.
- After the welding and the following accessory processes, but before the subsequent pressing and shaping operations, the
ring 2 offigure 2 is subjected to a preliminary rounding operation through radial expansion with per se known tools. - In such a rounding operation the expansion is of greater magnitude in a first axial portion of the
ring 2, so that the remaining axial portion of such a ring takes a substantially cone-shaped configuration.Figure 4 shows thering 2 after such an operation: thelower portion 2a subjected to radial expansion is substantially cylindrical, whereas the remainingaxial portion 2b is essentially shaped like a truncated cone. The height ha of the expandedportion 2a is preferably greater than that of theremaining portion 2b. Advantageously, the height ha can be equal to about three times the height hb. - The extent to which the
portion 2b is shaped like a cone, expressed as the difference in radius Δr between its ends (figure 4 ), can take values of about 1-5 mm. - After the aforementioned preliminary rounding operation, the
ring 2 is advantageously subjected to a material removal process, in particular turning, to bring the axial height or length to a predetermined nominal value, and to make its circular end edges level and parallel with each other. Such an operation is extremely important, as it allows possible imperfections of alignment and welding of the twoend limbs initial strip 1 to be eliminated, avoiding that in the following operations of plastic deformation of the ring, it suffers anomalous stress and reducing the effects of wear due to press-moulding tools. - In the aforementioned material removal process advantageously the corners of the edges of the
ring 2 which must drag against the moulds or shapes in the following operations are bevelled or rounded. - The
ring 2 is then subjected to press-moulding operations. - In a first moulding operation the edge with the greatest diameter of the
ring 2 is axially brought into abutment against a stop surface, so that the material of the ring is made to flow radially towards the centre, at its edge with smaller diameter. -
Figure 5 of the attached drawings shows anannular shell element 3 obtained through such a first moulding operation, made for example with (per se known) tools schematically and partially illustrated infigure 6 . Such tools comprise anupper mould 10 and a lowermatching mould 11, where the latter has an annular abutment orstop surface 11a for the edge of the ring with greater diameter. - By comparing
figures 4 and 5 it can be quickly gathered how through the first moulding operation, theannular shell 3 has a smaller diameter that is smaller than the corresponding diameter of thestarting ring 2, and a larger diameter that is substantially larger than the corresponding diameter of the starting ring. Moreover, the axial height or length of theannular shell 3 is shorter than the height of the startingring 2. - The first moulding operation is advantageously followed by a second one, in which the material of the ring is made to flow radially towards the centre, at its edge with the smaller diameter, whereas the material at its edge with greater diameter is made to flow radially outwards and longitudinally. This can be made, for example, with the tools schematically and partially illustrated in
figure 7 , in which theupper mould 13, in addition to what has already been described, has, at the bottom, a centralcylindrical ridge 13a, functioning as a "centrer" intended to define the diameter of the smallest opening 4a of the annular shell obtained through said second moulding operation (as seen in particular infigure 8 ). - The semi-finished element 4 can then be subjected to forming operation with a lathe to reach the intended distribution of thickness, and of shearing, for making in such a semi-finished element a plurality of openings or windows, intended for example to allow fixing elements of the disc-wheel to pass to the corresponding wheel hub, as ventilation openings, or simply for aesthetic purposes as shown, for example, in
figure 9 . - Advantageously, the starting strip of sheet metal 1 (
figure 1 ) is made in steel, in particular steel with low alloying element content, for example steel having a manganese content substantially between 0.15% and 0.80% of the total weight, and having a stretching percentage greater than 25%. - Of course, the principle of the invention remaining the same, the embodiments and the details can be widely varied with respect to what has been described and illustrated purely as an example , without for this reason departing from the scope of the invention as defined in the attached claims.
Claims (10)
- Method for manufacturing a disc (4) for a wheel of a motor vehicle, comprising the operations of:- providing a strip of sheet metal (1) substantially shaped like an elongated parallelogram with an essentially uniform thickness;- bending said strip of sheet metal (1) and welding together the end portions (1a, 1b) thereof so as to form a substantially cylindrical ring; and- subjecting said ring (2) to pressing and shaping operations through plastic deformation so as to give it a desired shape;the method being characterized in that:- the strip of sheet metal (1) is bent so that its end portions (1a, 1b) are level;- said end portions (1a, 1b) are brought together and butt welded substantially on a same plane, so as to obtain a ring (2) which has a chordal flattened wall portion (1a, 1b);- before undergoing the aforementioned pressing and shaping operations, said ring (2) is subjected to a preliminary rounding operation,and in that- said rounding operation is performed through radial expansion such that the expansion is of a greater magnitude in a first, substantially cylindrical, axial portion (2a) of the ring (2), and the remaining axial portion (2b) of the ring (2) takes a substantially cone-shaped configuration.
- Method according to claim 1, wherein the aforementioned remaining axial portion (2b) of the ring (2) which has a substantially cone-shaped configuration, extends over about 25% of the axial height or length of the ring (2).
- Method according to claim 1 or 2, wherein, after the aforementioned preliminary rounding operation and before said pressing and shaping operations, said ring (2) is subjected to an operation of material removal, in particular a turning operation, to bring its height or axial length to a predetermined nominal value, and to make its end edges level and parallel to each other.
- Method according to claim 3, wherein, in said operation of material removal, the corners of the edges of the ring (2) which must drag against the moulds or shapes in the following operations are bevelled or rounded.
- Method according to any one of the previous claims, wherein the aforementioned level end portions (1a, 1b) have an extension such that in cross-section they are each subtended by an angle (α) between 5° and 15°, and preferably of around 10°, said angle (α) having vertex on the axis (0) of the ring (2).
- Method according to any one of the previous claims, wherein said pressing operations comprise a first moulding operation which is carried out after said preliminary rounding operation, and in which the edge with the greatest diameter of the ring (2) is axially brought into abutment against a stop surface (11a), so that the material of the ring (2) is then made to flow radially towards the centre, at the edge with smaller diameter of the said ring (2).
- Method according to any one of the previous claims, wherein said pressing operations comprise a second moulding operation, in which the edge with smaller diameter of the ring (3) is radially brought into abutment against a centring element (13a), so that the material of the ring (3) is then made to flow radially outwards and longitudinally towards the edge with greater diameter of said ring (3).
- Method according to one of the previous claims, wherein said pressing operations comprise a moulding operation in which the material of the ring (3) is made to flow radially towards the centre, at the edge with smaller diameter, whereas the material at the edge with greatest diameter is made to flow radially outwards and longitudinally.
- Method according to any one of the previous claims, wherein said strip of sheet metal (1) is made from steel, in particular steel with low alloying elements content.
- Method according to claim 11, wherein the strip of sheet metal (1) is made from steel having a manganese content of substantially between 0.15% and 0.80% of the total weight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL09163363T PL2138250T3 (en) | 2008-06-23 | 2009-06-22 | Method for manufacturing discs for wheels, particularly for commercial vehicles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000491A ITTO20080491A1 (en) | 2008-06-23 | 2008-06-23 | PROCEDURE FOR THE MANUFACTURE OF WHEEL DISCS, PARTICULARLY FOR COMMERCIAL VEHICLES. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2138250A2 EP2138250A2 (en) | 2009-12-30 |
EP2138250A3 EP2138250A3 (en) | 2012-02-08 |
EP2138250B1 true EP2138250B1 (en) | 2014-12-24 |
Family
ID=40302178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09163363.6A Active EP2138250B1 (en) | 2008-06-23 | 2009-06-22 | Method for manufacturing discs for wheels, particularly for commercial vehicles |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2138250B1 (en) |
ES (1) | ES2533268T3 (en) |
IT (1) | ITTO20080491A1 (en) |
PL (1) | PL2138250T3 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1931163A (en) | 1930-06-16 | 1933-10-17 | Cleveland Welding Co | Method of making hub shells and like tubular metal articles |
US2983033A (en) * | 1960-01-04 | 1961-05-09 | Darwin S Cox | Method of manufacturing dished disks and the like |
JP4393118B2 (en) | 2003-06-13 | 2010-01-06 | 住友軽金属工業株式会社 | Manufacturing method of aluminum alloy rim in vehicle wheel |
JP4322055B2 (en) * | 2003-06-17 | 2009-08-26 | 本田技研工業株式会社 | Wheel rim manufacturing method |
ITTO20060437A1 (en) | 2006-06-15 | 2007-12-16 | Gianetti Ruote Spa | PROCEDURE FOR THE MANUFACTURE OF DISCS FOR WHEELS, PARTICULARLY FOR COMMERCIAL VEHICLES |
-
2008
- 2008-06-23 IT IT000491A patent/ITTO20080491A1/en unknown
-
2009
- 2009-06-22 EP EP09163363.6A patent/EP2138250B1/en active Active
- 2009-06-22 ES ES09163363.6T patent/ES2533268T3/en active Active
- 2009-06-22 PL PL09163363T patent/PL2138250T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
PL2138250T3 (en) | 2015-06-30 |
ITTO20080491A1 (en) | 2009-12-24 |
EP2138250A3 (en) | 2012-02-08 |
EP2138250A2 (en) | 2009-12-30 |
ES2533268T3 (en) | 2015-04-08 |
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