JP2009536099A - Method and apparatus for processing preform for rim and rim - Google Patents

Abstract

A method for processing a rim preform, comprising a rim edge portion (5) between a molded outer surface (8) of a mandrel (7) and a molded outer surface (11) of a molding roller (9). ) Is clamped in a slit (13) that moves along the circumferential edge of the annular metal base rim edge (5), where said slit (13) is wedge-shaped and here a mandrel (7 ) And the center line (6, 10) of the forming roller (9) is reduced (a), and the rim edge (5) member formed basically is made wider than the slit (13). A processing method for preforms for rims that are driven to the part. The present invention also relates to a rim preform processing apparatus and a rim.
[Selection] Figure 2

Description

  The present invention relates to processing of a rim preform (Preform).

  In the production of rims, it is known to process an annular, fundamentally formed metal rim edge into a configuration that more closely corresponds to an off-the-shelf rim bed in terms of shape and thickness. Such a basic rim edge forms a rim preform with a central portion that often forms the “Star” of the rim. Such a preform may be forged or cast, for example.

  EP 0 680 794 relates to an improvement of the spin forging process known per se, in which a mandrel arranged in a tiltable manner can be rotated instead of cooperating with a fixed bed as is conventional. It has been proposed to cooperate with an arranged forming roller. A closing slit is formed between this forming roller (Profiling roller) and a mandrel arranged in a tiltable manner, in which the rim member is processed by Flowing. The lower part of the rim is molded so that another part of the forming roller is formed in a conventional manner by pressing.

  Publications JP 5805513 (Japanese Patent Laid-Open No. 58-5513), DE 464772 (German Patent DE 464 772 9, JP 10005887 (Japanese Patent Laid-Open No. 10-5887)) and WO 99/67042 store shape information at least partially in a computer program. And the mandrels and rollers thus do not determine the basic cross-sectional shape of the rim.

  The publication US 2005/274015 (US patent US 2005/274015) relates to a rim manufacturing process in which a mandrel and a roller cooperate. Here, the collaboration involves a local forming operation, which is part of multiple preprocessing and is the final processing step for forming the basic shape of the rim.

  Publication DE 464 772 (German Patent DE 464 772) describes an apparatus for bending plate members with a pressure tool.

  PCT / US99 / 14437 (International Patent No. PCT / US99 / 14437) is a so-called flow spinning with the help of a pressure disk whose base rim edge is translated along the outer surface of the mandrel. It describes that the work is stretched, thinned and shaped on the outer surface of the mandrel. Utilizing a basal formed rim edge, forging or casting of large numbers of members, for example, relatively large diameter rims can be promoted, while rim bed member properties can be high quality by flow spinning operations. .

  The disadvantages of the known methods are that they are relatively complex, expensive and time consuming, and that final processing is sometimes required. In particular, the pressure disk causes a spiral pattern in the rim bed that needs to be horizontal in the final machining.

  The present invention replaces those conventional techniques and maintains the aforementioned advantages while avoiding the aforementioned drawbacks.

  To this end, the present invention provides a method for processing a rim preform. Here an annular basic metal rim edge is clamped in the slit, the slit moves along the circumferential edge of the rim edge between the molded outer surface of the mandrel and the molded outer surface of the forming roller To do. Here the slit is wedge-shaped and the angle contained here by the mandrel and the center line of the pressure roller is reduced, and by swirling the forming roller with respect to the mandrel, the basic rim edge part is removed from the slit. Drive to wider part.

  By accepting in this way the rim edge part that is basically formed in the closing nip between the two molded outer surfaces, the basic rim bed is stretched and thinned while avoiding the generation of spiral shaped patterns. And shaping can be performed quickly and easily in one processing step. While narrowing the slit, the contact surface between the base rim edge member and the outer surface of the pressure roller is then increased. The mandrel and roller then form the basic cross-sectional shape of the rim edge to be formed together.

In the figure, with reference to FIGS. 1 to 6, a plurality of continuous processes for processing a rim preform are schematically shown in a side sectional view. Also in the figures, similar or corresponding parts are indicated with similar reference numbers.
1 to 6 show an apparatus 1 for processing a rim preform 2.

In reducing this angle, the underlying rim bed member is displaced substantially axially, particularly away from the central central portion of the preform.
By maintaining a positive clamping angle during processing, it is possible to achieve a uniform flow direction of the member.

  During the first part of the process, during further reduction of the included angle, pressing the edge of the outer surface of the forming roller into the member of the underlying rim bed is one desired flow Can be forced in the direction of In particular, it can thus avoid that compression needs to be formed on the preform between the “star” and the underlying rim bed, which simplifies forging or casting of the preform Make it.

  Preferably, for this purpose, the distance between the mandrel and the forming roller is reduced by translating the mandrel and / or the forming roller. Preferably, here the forming roller is translated substantially laterally to its centerline in the direction of the mandrel so that the edge of the outer surface of the forming roller can penetrate into the underlying rim bed member. It has become.

  The present invention also relates to an apparatus for processing a rim preform, a mandrel having a molded outer surface that is rotatably disposed about a centerline, and a molded that is rotatably disposed about the centerline. A forming roller having an outer surface, and in use, a slit can be realized between the outer surfaces to receive an annularly formed metal rim edge, wherein the slit is wedge-shaped And here the forming roller is pivotably arranged with respect to the mandrel, and here the adjustment of the forming roller relative to the mandrel can reduce the angle between the mandrel and the center line of the forming roller .

  The invention also relates to a rim formed with the aid of the method and / or apparatus described above.

  Further advantageous embodiments of the invention are indicated in the subclaims. The invention will be described in more detail on the basis of non-limiting exemplary embodiments of the invention.

  This preform 2 comprises a central central part 4 forming the “star” of the rim and an annular, essentially formed rim edge part 5 extending along its outer peripheral surface.

  In this exemplary embodiment, the preform 2 is made from a light metal, such as Al 2 Si 7 Mg or AA 6061 alloy.

  The device 1 includes a mandrel 7 arranged so as to be rotatable about a center line 6. The mandrel 7 has a molded outer surface 8.

  The apparatus 1 further includes a forming roller 9 disposed so as to be rotatable about a center line 10. The molding roller 9 is provided with a molded outer surface 11. The outer surface 8, the mandrel 7 and the outer surface 11 of the forming roller together form the basic cross-sectional shape of the rim edge to be formed.

  During processing, the preform 2 is pressed onto the mandrel 7 with the help of the stick 12 and lifted from the mandrel 7 with the stick after processing.

  The forming roller 9 and the mandrel 7 are arranged so as to be adjustable relative to each other, as will be explained in detail hereinafter, so that a wedge-shaped slit 13 is realized between the outer surfaces. It is possible to receive the rim edge portion 5 that is basically formed therein.

  By adjusting the mandrel 7 and the molding roller 9 relative to each other, the angle between the mandrels 7 and the center lines 6 and 10 of the molding roller 9 can be reduced, so that the slits 13 sandwiched by the outer surfaces 8 and 11 respectively are being processed. It is designed to be narrowed.

  In this exemplary embodiment, the forming roller 9 is arranged to be translatable laterally with respect to its centerline 10 in the direction of the arrow P1, so that the outer surface 11 during the first part of the machining. The edge portion 7 can be pressed into the member of the basic rim edge portion 5.

  Further, the forming roller 9 is disposed so as to be pivotable with respect to the mandrel 7. For this reason, the forming roller 9 is pivotally moved in the direction of the arrow P2 with respect to the mandrel 7. The angle α sandwiched between the line 10 and the center line 6 of the mandrel can be reduced. As a result, the slits 13 sandwiched between the outer surfaces 8 and 11 can be narrowed, respectively. This angle α is acute and preferably has an initial value of less than about 45 ° and a final value of more than 0 °, in particular about 30 ° to 5 °, respectively.

  In this way, an annular, basic metal rim edge 5 is formed between the mandrel along the circumferential edge between the molded outer surface 8 of the mandrel 7 and the molded outer surface 11 of the forming roller 9. It can be clamped in a slit 13 that moves as a result of relative rotation with the forming roller.

  Here, the slit 13 has a wedge shape. In each case, the slit angle between the outer surfaces 8 and 11 decreases, so that the rim edge part 5 member formed on the basis is driven into the wider open part 15 of the slit.

  As the angle is reduced, the member then moves away from the “star” 4 of the preform 2 substantially axially. While narrowing the slit 13, the members of the basic rim edge 5 and the contact surfaces of the outer surfaces 8, 11 increase. In the final position, the basic rim edge 5 is stretched to the rim bed 16, thinned and shaped. Thus, in one processing step, a complete rim 5 is formed from any basic preform 2, which requires little or no final processing.

  During processing, most preferably, a positive angle α is maintained, so that the member of the basic rim edge 5 continues to flow into the wider part 15 of the slit during the overall processing.

  The present invention is not limited to the exemplary embodiments shown herein. For example, multiple pressure rollers may be used. Such variations are considered to be readily apparent to one skilled in the art and are understood to be within the scope of the invention as set forth in the following claims.

An apparatus 1 for processing a rim preform 2 is shown. An apparatus 1 for processing a rim preform 2 is shown. An apparatus 1 for processing a rim preform 2 is shown. An apparatus 1 for processing a rim preform 2 is shown. An apparatus 1 for processing a rim preform 2 is shown. An apparatus 1 for processing a rim preform 2 is shown.

Claims (10)

  A method of processing a rim preform, wherein an annular foundation is formed in a slit that moves along a circumferential edge of the rim edge between a molded outer surface of a mandrel and a molded outer surface of a molding roller. The metal rim edge is clamped, where the slit is wedge-shaped and the angle between the mandrel and the center line of the forming roller is reduced so that the forming roller can pivot relative to the mandrel The method of processing a rim preform, wherein the rim edge member formed basically by the step is driven to a wider portion of the slit.   The method of claim 1, wherein the contact surface between the member of the fundamentally formed rim edge and the outer surface of the forming roller increases while narrowing the slit.   The method according to claim 1, wherein a positive nip angle is maintained during the processing.   4. A method according to any one of the preceding claims, wherein during the reduction of the included angle, the basic rim edge member is displaced substantially axially outwardly relative to the annular rim edge. .   The edge of the outer surface of the forming roller is pressed into the member of the basic rim edge during the first part of the process. the method of.   The method of claim 1, wherein during the first portion of the process, the distance between the mandrel and the forming roller is reduced by translation of the mandrel and / or pressure roller relative to each other.   The method of claim 1, wherein during the first portion of the process, the forming roller is translated substantially laterally in the direction of the mandrel to its centerline.   An apparatus for processing a rim preform, comprising a mandrel having a molded outer surface rotatably disposed about a centerline, and a molded outer surface rotatably disposed about a centerline A molding roller having, and in use, between the outer surfaces, a slit can be realized between the outer surfaces to receive an annular, fundamentally formed metal rim edge therein, wherein the slit is wedged And wherein the forming roller is pivotally arranged with respect to the mandrel, and here the adjustment of the forming roller with respect to the mandrel reduces the angle between the mandrel and the center line of the forming roller A device for processing rim preforms.   The apparatus according to claim 8, wherein the forming roller is arranged to be able to translate substantially laterally with respect to the centerline.   A rim manufactured by the apparatus and / or method according to claim 1.

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