EP2786818A1 - Method for manufacturing an inertia ring and use thereof - Google Patents

Abstract

A method for producing a flywheel ring (1), wherein in a first method step as a pipe section (2) or rolled ring (3) formed blank (4) is made. In a second method step, the blank (4) on a roller burnishing machine (5) in the final contour of the flywheel (1) is rolled.

Description

Technical area

The invention relates to a method for producing a flywheel ring and its use, wherein in a first method step, a blank formed as a pipe section or rolled ring blank is produced.

State of the art

Such methods for producing a flywheel ring are generally known, wherein the blank produced in the first method step is machined in a second method step to the finished dimension of the flywheel ring.
The blank can be made of steel or cast iron, such as gray cast iron or spheroidal graphite cast iron.
A disadvantage of the previously known method is that, in the second method step, an undesirably large amount of material waste is produced by the chip-removing processing of the blank.

In order to obtain a flywheel having a predetermined weight and dimensions by machining a blank, it is required that the weight of the blank be about 80% to 150% higher than the finished weight of the flywheel. This is due to the fact that the blank must have an oversize in all directions for machining the flywheel ring, which is normally at least 2 mm, depending on the size of the flywheel ring; Under no circumstances may the blank have undersize anywhere.

Also known is the drawing of the blank from a round blank, wherein this method also causes considerable material waste, since, for example, the inner part of the blank is punched out by the process and thereby waste.

Presentation of the invention

The invention has for its object to show a method for producing a flywheel, in which at least the second process step can be performed without waste material.

This object is achieved by a method according to claim 1. On advantageous developments of the method, the dependent claims.

To solve the problem, it is provided that in a second process step, the blank is rolled on a roller burnishing machine in the final contour of the flywheel. The advantage here is that no material waste occurs when the blank is rolled into the final contour of the flywheel ring. Due to the rolling of the blank, it is not necessary that the blank, based on the final contour of the flywheel ring, has an oversize on all sides. Rolling is a non-cutting forming, so that the blank has a weight that also has the ready-to-use flywheel. By rolling the blank virtually only the dimensions of the blank are changed in order to achieve the desired final contour of the flywheel. A machining of the blank in the second process step is minimal.
Undersizes in some places of the blank are as long as unproblematic, as long as material from areas with oversize by rolling the undersize compensates and thereby the nominal size of the final contour of the flywheel ring is achieved. Material from areas of the blank with oversize are thus transported into areas of the blank, which have undersize.
The material requirement for the production of the flywheel ring is minimal.
Following the second process step, the flywheel has the ready-to-use weight and the ready-to-use form.
In the first process step, a blank is produced whose weight substantially corresponds to the ready-made flywheel. By "substantially" in this case the weight tolerances of the ready flywheel are to be understood.

In the first process step, a blank can be produced, the dimensions of which essentially correspond to the ready-made flywheel ring. By "substantially" is to be understood here that the material from which the blank is formed in the second process step exclusively by rolling such spanless that the ready-made flywheel ring is formed.

The blank is preferably produced without cutting in the first method step, so that practically no material waste is produced during the production of the blank in the first method step.

For this purpose, the blank may be formed by a rough section, which is cut to length, for example by laser cutting of a tube. In contrast to a sawing of the pipe section from the pipe, which causes sawdust and thus material waste, laser cutting produces only minimal material waste.

If a rolled ring for the blank to the application, this is formed without cutting, so that here material waste is avoided.

It is of an advantage to be emphasized that by avoiding material waste raw materials and thus costs can be saved. The flywheel ring produced by the method according to the invention is environmentally friendly, easy and inexpensive to produce.

In the second method step, a belt running surface can be rolled into the blank on the outer peripheral side. So designed flywheels can be used for example as a pulley. The geometry of the belt tread is adapted to the belt to be used. For example, it is possible to roll a belt tread for use with a poly-V belt.
In the second process step, the blank is formed without cutting to ready flywheel ring, wherein the belt running surface in the same process step, also by rolling, is generated.

The belt running surface, which is rolled into the blank on the outer peripheral side in the second method step, can consist of several circumferential and V-shaped webs.

In a third method step, a material outlet formed on the flywheel ring during the second process step can be removed from the flywheel ring. A material spill may occur due to the non-cutting deformation of the blank to the flywheel ring, wherein optionally such a material spill is removed in the third step to prevent unwanted imbalance of the flywheel during its intended use.

In the third process step, the minimum material outlet can optionally be removed by laser cutting from the flywheel. As stated previously, virtually no waste material is produced by the separation of the material outlet from the flywheel ring by laser cutting.

Deviating from this, instead of laser cutting, in the third method step, a cutting process for separating the minimal material outlet from the flywheel can be used.

The weight of the spout removed from the flywheel is negligible relative to the weight of the flywheel ready for use and is usually not more than 5% to 10% of the finished weight of the flywheel.

Use can be a flywheel, made by the method described above, in a torsional vibration damper. Torsional vibration damper reach, for example, together with internal combustion engines for use, which can be damped by the torsional vibration damper rotational irregularities of the crankshaft, which are caused by the firing order of the internal combustion engine.

Brief description of the drawing

Fig. 1

den ersten Verfahrensschritt zur Herstellung des Rohlings,

Fig. 2

den zweiten Verfahrensschritt, bei dem der Rohling in die Endkontur des Schwungrings rolliert wird und

Fig. 3

den dritten Verfahrensschritt, der dann zur Anwendung gelangen kann, wenn während des zweiten Verfahrensschritts ein Materialauslauf am Schwungring entsteht, der entfernt werden soll.

The inventive method is described below with reference to FIGS. 1 to 3 described in more detail.
These show in a schematic representation:

Fig. 1

the first process step for the production of the blank,

Fig. 2

the second process step, in which the blank is rolled into the final contour of the flywheel and

Fig. 3

the third step, which can then be used if, during the second process step, a material spout is formed on the flywheel, which is to be removed.

Embodiment of the invention

All three process steps can be performed sequentially in a single machine.

In FIG. 1 the blank 4 required for carrying out the second method step is shown. The blank 4 is formed as a pipe section 2 or rolled ring 3 and consists of a metallic material.
Starting from a pipe, the pipe section 2 can be separated from the pipe by laser cutting.

The weight of the blank 4 substantially corresponds to the weight of the ready-to-use flywheel ring 1, just as the dimensions of the blank 4 essentially correspond to the dimensions of the ready-to-use flywheel ring 1.

In Fig. 2 the second process step is shown.

The blank 4 produced in the first method step is rolled on a roller burnishing machine 5 into the final contour of the flywheel ring 1. By rolling the blank 4 is formed without cutting to the flywheel 1. Over- or undersize of the blank 4, based on the ready-made flywheel 1, are compensated by a corresponding deformation of the blank 4. Material from the partial regions of the blank 4, which have a relative excess to the ready-to-use flywheel ring 1, are displaced into the regions of the blank 4, which have a relative undersize to the ready-made flywheel ring 1.
The rolling produces no material waste in the second process step, in contrast to the production of a flywheel ring according to the prior art, in which a flywheel ring is produced by the machining process "turning" out of the pipe section.

The flywheel ring 1 shown here is provided on the outer peripheral side with a belt running surface 6, for receiving a poly "V" belt. The belt running surface is produced by rolling in the second method step.

In Fig. 3 a third process step is shown, which can then be used if, during the second process step due to the production of the flywheel ring 1, a material outlet 7 is formed, which is to be removed from the flywheel ring 1. The removal of the material outlet 7 from the flywheel 1 is carried out in the third step shown by Laser cutting, so also by a process in which no material waste arises.

The flywheel ring 1, which has been produced by the method and the method steps described above, can be used, for example, in a torsional vibration damper for an internal combustion engine in a motor vehicle.

Claims (8)

Method for producing a flywheel ring (1), wherein in a first method step a blank (4) formed as a pipe section (2) or rolled ring (3) is produced, characterized in that in a second method step the blank (4) is mounted on a roller burnishing machine (5) is rolled into the final contour of the flywheel ring (1). A method according to claim 1, characterized in that in the first process step, a blank (4) is produced, whose weight substantially corresponds to the ready flywheel (1). Method according to one of claims 1 or 2, characterized in that in the first process step, a blank (4) is produced, the dimensions of which substantially correspond to the ready-flywheel (1). Method according to one of claims 1 to 3, characterized in that the blank (4) is produced without cutting in the first method step. Method according to one of claims 1 to 4, characterized in that in the second method step on the outer circumference side in the blank (4) a belt running surface (6) is rolled. Method according to one of claims 1 to 5, characterized in that in a third process step, a produced during the second process step due to the production of the flywheel (1) Materialauslauf (7) from the flywheel (1) is removed. A method according to claim 6, characterized in that in the third process step, the material outlet (7) is removed by laser cutting from the flywheel ring (1). Use of a flywheel ring (1) made by a method according to any one of claims 1 to 7 in a torsional vibration damper.

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