EP1270111A1 - Method and device producing a rotationally symmetrical object - Google Patents

Abstract

The process involves deforming a tubular blank to produce an annular shaped part between inner and first outer rolls. Its diameter is increased till it meets another outer roll. In the second step, the annular shaped part is deformed inside and outside between a second inner roll (5) and at least one of the outer rolls.

Description

The present invention relates to a method and an apparatus for manufacturing a rotationally symmetrical component by rolling. The present invention relates in particular to a method and an apparatus for producing a Sliding sleeve for the manual transmission of a motor vehicle.

There are two types of ring rolling: on the one hand radial ring rolling and on the other the pressure rolling. In radial ring rolling, an annular blank is used as the starting product between a rotating outer roller and an inner one Formed mandrel or an inner roller. When the gap between the mandrel or the inner roller and the outer roller result in a tangential Flow of material that leads to radial growth of the ring. A relatively inexpensive The blank to be produced thus becomes an annular component by rolling formed with a large diameter. The inner circumferential surface can be used for ring rolling or profiling the outer peripheral surface. It is also possible to use the profile to be carried out in combination on both circumferential surfaces. Here, however, there is Problem, the blank between a profiled outer and a profiled inner Position and hold the roller with the required accuracy. In particular when starting the rolling process there is a risk that the blank in the axial direction migrates relative to the rollers. Accordingly, the profiling cannot or only with insufficient accuracy at the desired location.

In the case of pressure rolling, an annular blank is formed between several on the outer one Circumferential surface arranged rollers formed. It is possible to have an outer profile to shape on the blank. These profiles can be made without the for Ring rolling typical bevels. In other words, 90 ° groove punctures are involved in the pressure rolling possible.

Proceeding from this, the object of the invention is a method and a Device for producing a rotationally symmetrical component, in particular one Specify sliding sleeve for a motor vehicle transmission, which is the diameter of the used Blanks enlarged and at the same time to produce profiles without bevels (90 ° recesses) can.

To achieve the object, a method with the present invention Features of claim 1 specified. The device according to the invention is claimed 10 specified.

Preferred developments result from the dependent claims 2 to 9 for the method and 11 to 14 for the device.

In the method according to the invention, the annular blank is first of all used Ring rolling between a first inner roller and a first outer roller Formed to increase the diameter to form a ring profile part. This ring profile part has profiling on its outer peripheral surface and / or on its inner peripheral surface on. This first step of the method according to the invention is stopped when the ring profile part by radial growth for contact with at least one other outer roller comes. The one or more other outer roller and the first outer roller are arranged relative to each other in such a way that the rolling on the Ring profile part adjacent sections of the individual rollers on a common Circular path. In a second step, the method according to the invention the ring profile part profiling on its outer peripheral surface by at least one of those outer rolls, which at the end of the first step the radial Limit growth effectively. The ring profile part is on its inner peripheral surface in the second step also reshaped without radial growth, so that the production of profiles without bevels (e.g. 90 ° groove insertion) is possible. With the method according to the invention, a finished rotationally symmetrical component can are produced solely by rolling, which is both on its inner peripheral surface and is profiled on its outer peripheral surface. With the invention The component can therefore be finished in its final contour with simultaneous solidification of the process inner and outer peripheral surfaces deformed by rolling, in particular cold rolling getting produced.

Figur 1

einen Rohling vor dem ersten Verfahrensschritt;

Figur 2

ein Ringprofilteil, welches durch Umformen des in Figur 1 gezeigten Rohlings in dem ersten Verfahrensschritt hergestellt ist und;

Figur 3

eine durch weiteres Umformen des in Figur 2 gezeigten Ringprofilteils nach Beendigung des zweiten Schrittes hergestellte Schiebemuffe für ein Schaltgetriebe.

The invention is explained in more detail below using an exemplary embodiment in conjunction with the drawing. In this show:

Figure 1

a blank before the first process step;

Figure 2

a ring profile part, which is produced by reshaping the blank shown in Figure 1 in the first process step and;

Figure 3

a sliding sleeve for a manual transmission produced by further shaping the ring profile part shown in Figure 2 after completion of the second step.

In Figure 1, a blank 1 is shown, which cylindrical inner and outer peripheral surfaces 1a, 1b. Reference number 2 denotes a first outer roller, with reference number 3 a first inner roller. While in the embodiment shown the first inner roller 3 has a cylindrical profile, the first outer roller 2 a profiled outer peripheral surface with an inwardly tapering recess, which has a base 2a extending in the axial direction of the roller 2, one of which Projection 2b with a rectangular cross section protrudes radially outwards. The lead 2b runs with its outer surfaces perpendicular or parallel to the axis of rotation of the first outer roller 2.

By ring rolling between the first outer roller 2 and one, not shown In the second outer roller, the blank 1 shown in FIG. 1 becomes one shown in FIG Ring profile part 4 reshaped. The ring profile part 4 corresponds with its envelope surface, which contains the outer contour of the ring profile part 4, the contour of the outer Circumferential surface of the first outer roller formed recess without the Tab 2b. The ring profile part 4 has an outwardly opening cross section Groove 4b enlarging in the radial direction, the bottom of the groove against the end face of the projection 2b is formed during rolling. The widening towards the outside Cross-sectional geometry of the groove 4b results from the material flow during Rollers. The material that is pushed radially outwards is not able to adhere to the surface to lay the side surfaces of the projection 2b. Rather, the material of the blank 1 deformed radially outwards during ring rolling, but can only be very limited in axial direction Flow towards.

When rolling the blank 1 shown in FIG. 1 into the ring profile part shown in FIG. 2 4 are initially only the first outer roller 2 and the first inner roller 3 on the respective peripheral surfaces 1a, 1b of the blank 1. Ring rolling grows the blank 1 radially outwards, and so far until further, outside the blank 1 arranged, not shown here, outer rollers on the outer peripheral surface of the ring profile part 4 come to the plant. At the end of the first step the finished component to be produced by rolling, here a sliding sleeve 6 with regard to its contour containing the envelope surface.

At the end of the first process step - if the part contour requires it - the first inner roller 3 can be exchanged for a second inner profiled roller 5. In Figure 3 this second inner roller 5 is shown profiled, i.e. points at the shown Embodiment a convex projection 5a.

This second inner roller 5 is in the second process step on the inner peripheral surface 4a of the ring profile part 4 pressed and continuously moved radially outwards, around an inward opening on the inner peripheral surface 1a of the ring profile part 4 Form groove 4c. Because a radial ring growth due to the adjacent outer rollers is no longer possible, this flows through the second inner roller 5 displaced material flows into the located between the groove 4b and the projection 2b Free space until the contour of the groove 4b corresponds to that of the projection 2b. At the At the end of the forming process, the first outer roll 2 and the second inner roll close Roller 5 corresponding to the cross-sectional profile of the sliding sleeve produced Cavity.

In the second step, several, preferably three, are each at an angle Outer rollers 2 on the outer circumferential surface arranged at 120 ° to each other of the ring profile part 4. The contour of the outer peripheral surface of these rollers is preferred identical. The outer rollers continuously act on the outer contour of the ring profile part 4 and thus prevent radial growth of the ring profile part. The envelope surface of the ring profile part 4 shown in Figure 2 is thus identical to that of the sliding sleeve 6 shown in FIG. 3.

Finally, the sliding sleeve 6 produced in this way is released, for example by that one of the outer rollers 2 is moved out of its position and from the Device removed.

In the second step, the material may flow axially Thrust washers or fixed, alternatively also deliverable axial rollers can be limited. These axial rollers can be distributed between the circumference of the ring profile part 4 between the respective outer rollers 2 may be arranged.

LIST OF REFERENCE NUMBERS

1

blank

2

first outer roller

2a

reason

2 B

head Start

3

first inner roller

4

Ring profile part

4b

Groove (outside)

4c

Groove (inside)

5

second inner roller

6

sliding sleeve

Claims (14)

Method for producing a rotationally symmetrical component, in particular one Sliding sleeve for a motor vehicle transmission, in which in a first step an annular Blank by ring rolling between a first inner roll and one the first outer roller is enlarged to form a ring profile part until the radial growth by contacting the ring profile part with at least one further outer roller is limited and in a second step Ring profile part between a second inner roller and at least one of the outer Rolls formed on its inner and / or outer peripheral surface to give a profile becomes. A method according to claim 1, characterized in that in the second step the radial growth of the ring is limited by the outer rollers. A method according to claim 1 or 2, characterized in that in the second step the first inner roller is used as the second inner roller. Method according to one of the preceding claims, characterized in that in the first step a roller with a cylindrical rolling surface is used to form an annular profile part with a cylindrical inner surface. Method according to one of the preceding claims, characterized in that between the first and the second step, the first inner roller is exchanged for a second inner roller with a different profile than the first inner roller. Method according to one of the preceding claims, characterized in that in the first step, the blank is reshaped on its outer circumferential surface in a profiling manner. Method according to one of the preceding claims, characterized in that in the second step the ring profile part is deformed while maintaining the outer contour containing the envelope surface of the ring profile part. Method according to one of the preceding claims for producing a sliding sleeve of a transmission, characterized in that in the first step a first groove opening towards the outer peripheral surface is formed and
that in the second step a second groove opening towards the inner circumferential surface is formed and that the first groove is reduced by the volume thus displaced. Method according to one of the preceding claims, characterized in that in the first step a first groove is formed with a cross-section widening in the radial direction, which in the second step to form a groove with side surfaces extending essentially at right angles to the central longitudinal axis of the ring profile part is reshaped. Device for producing a rotationally symmetrical component by forming a blank, in particular a sliding sleeve for a transmission, comprising several outer profiled rollers and two inner rollers, which optionally on the inside of the component opposite an outer roller can be brought into action are, the first inner roller a flat and the second inner roller one has profiled peripheral surface. Apparatus according to claim 10, characterized in that the outer profiled rollers have identically formed peripheral surfaces. Apparatus according to claim 10 or 11, characterized in that at least one of the outer rollers is movably mounted. Device according to one of claims 11-12, characterized in that at least one of the outer rollers, preferably a stationary roller, is driven. Device according to one of claims 10 to 13, characterized by at least one axial roller which can be advanced to the end face of the component and a counter roller assigned to this axial roller.

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