DE102018121129A1 - Smooth rolling tool and method for smooth rolling at least one inner peripheral surface of a component, in particular for a motor vehicle - Google Patents

Abstract

The invention relates to a smooth rolling tool (1) for smooth rolling at least one inner circumferential surface (4), with a base body (5), with a rolling region (9), which has a plurality of successive rotatable elements in the circumferential direction of the base body (5) on the base body (5 ) held rolling body (10) for rolling the inner peripheral surface (4), with at least one supply channel (11) for guiding a fluid, by means of which the rolling body (10) can be acted upon by a force acting outwards in the radial direction (7) and thereby are to be pressed against the inner circumferential lateral surface (4), and with at least one second rolling region (9) following the rolling region (9), which has a plurality of second rolling bodies successively arranged in the circumferential direction of the main body (5) and rotatably held on the main body (5) (10) for rolling a further inner circumferential surface (4), the second rolling elements (10) using the fluid a respective force acting in the radial direction (7) to the outside can be acted upon and thereby pressed against the further inner peripheral surface (4).

Description

The invention relates to a smooth rolling tool for smooth rolling or rolling at least one inner circumferential surface of a component, in particular for a motor vehicle, according to the preamble of claim 1. Furthermore, the invention relates to a method for smooth rolling or rolling at least one inner circumferential surface of a component, in particular for a motor vehicle , according to the preamble of claim 8.

The EP 0 353 376 A1 discloses a rolling tool for smooth rolling and / or deep rolling, with at least one rolling roller rotatably mounted, guided and supported on a roller head. It is provided that the roller head is designed as a hydrostatic bearing for the roller and has a connection channel for a connection to a pressure wave for a fluid.

The DE 10 2016 002 119 B3 discloses a roller burnishing tool, with a roller body holder for receiving spherical roller bodies and a tool shaft receiving the roller body holder. The roller body holder is designed with a cylindrical base body and a roller body cap.

In addition, the EP 2 828 036 B1 a device for electromechanically supported smooth rolling as known.

The object of the present invention is to provide a smooth rolling tool and a method so that at least one component can be smoothly rolled with a particularly high quality in a particularly time and cost-effective manner.

This object is achieved by a smooth rolling tool with the features of claim 1 and by a method with the features of claim 8. Advantageous embodiments of the invention are the subject of the dependent claims.

A first aspect of the invention relates to a smooth rolling tool for smooth rolling or rolling at least one inner circumferential surface of a component, in particular for a motor vehicle, and preferably for an internal combustion engine of a motor vehicle. Smooth rolling is usually also referred to as roller burnishing, in the context of the invention “smooth rolling” is to be understood as a shaping process by means of which a particularly smooth, in particular mirror-smooth, surface in the form of the inner peripheral surface of the component and / or a defined surface structure of the inner peripheral side Shell surface can be produced. A particularly high surface quality of the inner circumferential lateral surface can be achieved by the smooth rolling, the component preferably being formed from a metallic material, in particular from a steel, and the inner circumferential lateral surface being formed from the metallic material, in particular the steel. In the context of the invention, the terms “smooth rolling” and “rolling” are to be considered synonymously.

The smooth rolling tool has a base body, which is also referred to as the base or base element, and a rolling region, which is also referred to as the first rolling region. The first rolling region has a plurality of first rolling bodies, which follow one another in the circumferential direction of the base body and are spaced apart in the circumferential direction of the base body, for rolling the inner circumferential surface. The first roller bodies are rotatably held on the base body, in particular in all possible directions and / or freely, so that the respective first roller body - while it is held on the base body - in every possible direction or around every possible axis of rotation, in particular relative to that Basic body that can be rotated. In other words, the respective first roller body can be rotated relative to the base body, in particular freely, while the respective roller body is held on the base body.

The smooth rolling tool also has at least one supply channel for guiding or guiding a fluid, in particular a liquid. The supply channel runs at least partially, in particular at least predominantly or completely, within the base body. Via the supply channel, the first roller bodies can be acted upon by the fluid with a respective force acting in the radial direction, in particular of the base body, and thus, for example, away from the base body or away from the supply channel. As a result, the respective first rolling bodies are pressed against the inner circumferential surface, which is also referred to as the first inner circumferential surface.

The smooth rolling tool can be rotated or rotated, for example, about an axis of rotation relative to the component and thus relative to the first inner circumferential surface, in order to thereby roll the inner circumferential surface, that is, to roll it smooth. The aforementioned radial direction, in particular of the base body or of the smooth rolling tool as a whole, is to be understood as a direction which is perpendicular to the axial direction and thus, for example, to Direction of longitudinal extension of the base body. In particular, the radial direction runs in a plane, in particular perpendicular to the axial direction, in which the aforementioned circumferential direction, along which the rolling bodies of the first rolling region, also referred to as the first rolling bodies, follow one another and are spaced apart.

In order to be able to roll or smooth-roll the component in a particularly time-saving and cost-effective manner and with a particularly high quality, it is provided according to the invention that the smooth-rolling tool follows at least one in the axial direction of the smooth-rolling tool or the base body after the first rolling region and from the first Rolling region has spaced apart second rolling region. The axial direction runs perpendicular to the previously mentioned imaginary plane and coincides, for example, with the said axis of rotation or runs parallel to the axis of rotation. The second rolling region has a plurality of second rolling bodies which are successive in the circumferential direction of the base body and thus the smooth rolling tool, spaced apart from one another and rotatably held on the base body, for rolling a further inner circumferential surface of the component. The previous and following explanations regarding the first rolling elements can also be easily transferred to the second rolling elements and vice versa. Thus, for example, the second roller bodies, in particular while they are held on the base body, can be rotated in any direction or about any axis of rotation relative to the base body. Thus, the second roller bodies are preferably held rotatably on the base body relative to the base body.

The second roller bodies can also be acted upon by the fluid with a respective force acting in the radial direction outward via the supply channel and thereby pressed against the further inner circumferential surface. In this way, it is possible, in particular by rotating the smooth rolling tool and the component about the axis of rotation relative to one another, to process the inner circumferential lateral surfaces spaced apart from one another in the axial direction of the smooth rolling tool, for example, simultaneously or in parallel by means of the rolling regions of the smooth rolling tool, and thereby smoothing them, so that chronologically successive burnishing or respectively Rolling processes in the course of which the respective inner circumferential lateral surfaces are successively or successively smooth-rolled can be avoided.

The inner circumferential side surfaces are spaced apart, for example, in the axial direction of the smooth rolling tool, so that, for example, in the axial direction of the smooth rolling tool, an interruption or a recess is arranged between the inner circumferential side surface surfaces, which is set back in the radial direction of the smooth rolling tool with respect to the inner circumferential side surfaces. Furthermore, it is conceivable that there is a free space, a cavity or a gap in the axial direction of the smooth rolling tool between the inner circumferential lateral surfaces. Furthermore, it is possible that the inner circumferential lateral surfaces are respective parts, areas or components of an inner circumferential total lateral surface, the components, for example, merging into one another without interruption in the axial direction of the smooth rolling tool. In any case, it is possible to simultaneously machine the component by means of the smooth rolling tool according to the invention at spaced-apart locations at which the inner circumferential lateral surfaces are arranged, so that the component can be machined in a time and cost-effective manner and with a particularly high quality .

In order to be able to machine the component with a particularly high quality, it is provided in an advantageous embodiment of the invention that guide elements, in particular non-rotatably and / or non-displaceably, are held on the base body. The feature that the guide elements are, for example, held in a rotationally fixed manner on the base body means that the guide elements are secured against relative rotation taking place relative to the base body. The feature that the guide elements are held on the base body so as to be non-displaceable is to be understood that the guide elements are secured against displacements relative to the base body. The base body can be supported on the respective inner circumferential lateral surface in the radial direction of the smooth rolling tool via the guide elements and thereby be held at a radial distance from the respective inner circumferential lateral surface. The radial distance is understood to mean that the distance runs in the radial direction of the smooth rolling tool and thus of the respective inner circumferential surface. The respective inner circumferential lateral surface preferably has a cylindrical shape, that is to say the shape of a straight circular cylinder, the respective inner circumferential lateral surface being concave, that is to say arched inward and thus in the radial direction of the smooth rolling tool away from the smooth rolling tool.

It has proven to be particularly advantageous if the respective guide element is formed from a plastic. As a result, in particular when the smooth rolling tool or at least one of the rolling areas in Axial direction of the smooth rolling tool is pushed through the inner circumferential surface while the guide elements slide on the inner circumferential surface, avoiding undesirable damage, in particular scratches, to the inner circumferential surface. The respective guide element preferably has at least one contact surface, via which the respective guide element can be supported directly or directly in the radial direction of the smooth rolling tool on at least one of the inner circumferential lateral surfaces. The contact area is formed by the plastic. The feature that the respective guide element can be supported or is supported directly or directly on the inner circumferential lateral surface via the contact surface and thus the contact surface itself is to be understood to mean that the contact surface can directly touch or touch the inner circumferential lateral surface, in particular during smooth rolling.

In a particularly advantageous embodiment of the invention, the respective guide element is designed as a guide rail, so that the respective guide element has a longitudinal extent extending in the axial direction of the smooth rolling tool. As a result, the smooth rolling tool can be supported particularly advantageously on at least one of the inner circumferential lateral surfaces, so that tilting can be avoided.

In order to be able to roll or smooth-roll the respective inner circumferential surface with a particularly high quality, it is provided in a further embodiment of the invention that the respective rolling body is designed as a ball, that is to say as a rolling ball.

A further embodiment is characterized in that the respective rolling body is held on the base body so as to be translationally movable relative to the base body in the radial direction of the smooth rolling tool. This means that the respective rolling body can be moved, that is to say shifted, a certain distance or a certain distance in the radial direction of the smooth rolling tool relative to the base body, while the respective rolling body is held on the base body. On the one hand, this can ensure that the respective rolling body remains held on the base body and is therefore not lost or does not detach from the base body. On the other hand, it can thereby be ensured that the respective rolling body lies against the respective inner circumferential lateral surface during the smooth rolling, that is to say it is in support system with the respective inner circumferential lateral surface, so that the respective inner circumferential lateral surface can be rolled with a particularly high quality. Furthermore, the respective rolling body can be pressed particularly advantageously against the inner circumferential surface by means of the fluid and can thus be held in support contact with the inner circumferential surface. In addition, for example, by setting a pressure of the fluid, the force with which the respective roller body is acted upon and held in support system with the inner circumferential surface can be set particularly precisely and in a defined manner. As a result, the pressure and thus the force can be adapted to different requirements as required.

In a particularly advantageous embodiment of the invention, the respective roller body is accommodated in a pocket of the supply channel and can thus be acted upon directly with the fluid. This is to be understood to mean that the fluid received in the supply channel directly touches the respective roller body and thus can contact it and thereby press it outward in the radial direction, so that the respective roller body is held particularly advantageously in a support system with the inner peripheral surface and so that the pressure or the force can be set particularly precisely.

A second aspect of the invention relates to a method for smooth rolling at least one inner peripheral surface of a component, in particular for a motor vehicle. In the method, the at least one inner circumferential surface of the component is rolled, that is rolled, by means of a smooth rolling tool, in particular by means of a smooth rolling tool according to the first aspect of the invention. Within the scope of the method according to the invention, the smooth rolling tool has a base body, which is also referred to as a base or base element, and a first rolling region which has a plurality of first rolling bodies, which are successive in the circumferential direction of the base body and are spaced apart from one another and rotatably held on the base body, for rolling what is also referred to as the first inner circumferential surface includes inner circumferential surface. In addition, the smooth rolling tool in the method according to the invention has at least one supply channel, by means of which a fluid is guided, by means of which the first rolling elements are acted upon by a respective force acting in the radial direction and are thereby pressed against the first inner circumferential lateral surface, in particular during this Component and the smooth rolling tool are rotated relative to each other about an axis of rotation.

Now the component is particularly time-saving and cost-effective as well as with a particularly high In order to be able to smoothly roll quality, it is provided in the second aspect of the invention that the smooth rolling tool has at least one second rolling region which follows the first rolling region in the axial direction of the first rolling region and is spaced apart from the first rolling region and which has a plurality of successive ones in the circumferential direction of the base body has spaced and rotatably held on the base body second rolling body for rolling a further or second inner circumferential surface of the component. The second rolling bodies are also acted upon by the fluid with a respective force acting in the radial direction outward via the supply channel and thereby pressed against the further inner circumferential surface, in particular while the component and the smooth rolling tool are rotated relative to one another about the axis of rotation. Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second aspect of the invention and vice versa.

As already mentioned before, the axial direction of the smooth rolling tool coincides with the axis of rotation or runs parallel to the axis of rotation, while the radial direction of the smooth rolling tool and thus of the base body runs perpendicular to the axial direction. The base body is cylindrical, for example, in particular on the outer circumference, and thus has, for example, the shape of a straight circular cylinder at least on the outer circumference.

In an advantageous embodiment of the invention, the component and the smooth rolling tool are rotated relative to one another at a speed which is in a range from 2,000 revolutions up to and including 5,000 revolutions per minute, in particular in a range from 2,500 revolutions per minute up to and including 4,000 revolutions per minute and preferably in a range from 2,500 revolutions per minute up to 3,500 revolutions per minute. The speed, in particular precisely, is preferably 3,000 revolutions per minute. This makes it possible to achieve a particularly high quality of the respective smooth-rolled inner circumferential surface.

In a particularly advantageous embodiment of the invention, the fluid, which is preferably in the form of a liquid, in particular an oil, has a pressure, while the rolling elements are pressed outward in the radial direction by means of the fluid, the pressure being in a range from 15 bar to 70 inclusive bar. This enables a particularly high quality to be guaranteed.

Finally, it has proven to be particularly advantageous if a component of an internal combustion engine for driving a motor vehicle having at least one bearing aisle is used as the component, the inner circumferential lateral surfaces being formed by the bearing aisle, which is smoothed using the smooth rolling tool. This embodiment is based on the knowledge that, in particular in the case of internal combustion engines, which are designed, for example, as reciprocating piston engines, high qualities of bearing aisles are required. At the same time, it is desirable to be able to present this high quality in a time and cost-effective manner. This can be achieved by means of the method according to the invention or by means of the smooth rolling tool according to the invention. In particular, a particularly precise roundness of the bearing aisle can be realized by means of the method according to the invention, so that a shaft can be mounted on the bearing aisle and thus via the bearing aisle on the component in a particularly precise and thus low-load rotatable manner. The shaft is, for example, an output shaft of the internal combustion engine, in particular a crankshaft, a camshaft of the internal combustion engine or an eccentric shaft of the internal combustion engine.

• 1 eine schematische Draufsicht eines erfindungsgemäßen G lattwalzwerkzeu g s;
• 2 eine schematische Darstellung eines erfindungsgemäßen Verfahrens zum Glattwalzen eines Bauteils;
• 3 ausschnittsweise eine schematische Draufsicht des Glattwalzwerkzeugs; und
• 4 eine schematische Querschnittsansicht des Glattwalzwerkzeugs beim Glattwalzen des Bauteils.

Further details of the invention emerge from the following description of a preferred exemplary embodiment with the associated drawings. It shows:

• 1 a schematic plan view of a Gatt rolling tool according to the invention;
• 2 is a schematic representation of a method according to the invention for smooth rolling a component;
• 3 excerpts a schematic top view of the smooth rolling tool; and
• 4 is a schematic cross-sectional view of the smooth rolling tool when smooth rolling the component.

In the figures, identical or functionally identical elements are provided with the same reference symbols.

1 shows a schematic plan view of a smooth rolling tool 1 for smooth rolling the inner circumferential surfaces of a component 2 an internal combustion engine for a motor vehicle. In its completely manufactured state, the motor vehicle, which is designed, for example, as a motor vehicle, in particular a passenger car, has the internal combustion engine, for example, as a reciprocating piston engine, by means of which the motor vehicle can be driven. The component 2 is for example a Crankcase, in particular a cylinder crankcase, or a cylinder head of the internal combustion engine and has a bearing alley 3 on which at least one shaft can be rotatably supported. The Lagergasse 3 has several, in the axial direction of the warehouse aisle 3 or the shaft spaced apart bearings L on, with the shaft in its rotatable at the bearing alley 3 and thus rotatable over the storage lane 3 on the component 2 stored state in the radial direction of the shaft and / or in the axial direction of the shaft at the bearing points L on the component 2 is supported or supported. For example, the shaft is at the respective bearing point L via a respective bearing element designed as a roller bearing or plain bearing on the component 2 rotatably supported.

The Lagergasse 3 points at the respective storage location L a respective inner circumferential surface on which the shaft can be supported or supported in the radial state of the shaft in its stored state. Thus, the Lagergasse forms 3 the plurality of inner circumferential lateral surfaces, of which in 1 and 4 one with 4 designated inner circumferential surface is recognizable. Looks particularly good 4 it can be seen that the respective inner circumferential surface 4 is cylindrical and in particular circular and concave. In particular is off 1 recognizable that the bearing aisles spaced apart in the axial direction of the shaft L provided or arranged inner circumferential lateral surfaces 4 in the axial direction of the shaft and thus in the axial direction of the bearing lane 3 are spaced from one another and thereby follow one another. As will be explained in more detail below, it is now using the smooth rolling tool 1 possible in the axial direction of the storage lane 3 successive and spaced inner circumferential lateral surfaces 4 edit and roll at the same time.

For this purpose, the smooth rolling tool 1 a base body also referred to as a base, base element or shaft 5 on which can be formed in one piece or in several parts. The basic body 5 is cylindrical at least on the outer circumference side and preferably also on the inner circumference side, so that, for example, one in the radial direction of the smooth rolling tool 1 outward-facing outer circumferential surface 6 of the basic body 5 are cylindrical and can thus have the shape of a straight circular cylinder. The radial direction of the smooth rolling tool 1 is in 1 with a double arrow 7 illustrated, and the axial direction of the smooth rolling tool 1 is in 1 with a double arrow 8th illustrated.

The smooth rolling tool 1 now has several, in the axial direction of the base body 5 and thus the smooth rolling tool 1 total of successive and spaced rolling areas 9 on. The number of rolling areas 9 corresponds, for example, to the number of storage locations L , The respective rolling area 9 shows - how particularly well when viewed together 3 and 4 is recognizable - several, in the circumferential direction of the base body 5 successive, spaced apart and, in particular freely, rotatable on the base body 5 held rolling elements in the form of rolling balls simply referred to as balls 10 by means of which the respective inner circumferential lateral surface 4 rolled, that means can be rolled smooth. As part of a process for smooth rolling the component 2 , especially along the Lagergasse 3 , the inner circumferential surface 4 by means of one of the rolling areas and thereby by means of its rolling balls 10 rolled smooth.

How particularly good looking 4 is recognizable, the smooth rolling tool 1 furthermore at least one, for example within the base body 5 trending, supply channel 11 for guiding a fluid, preferably a liquid. This means that during the process the fluid in the supply channel 11 is recorded. To do this, the fluid enters the supply channel 11 initiated, the fluid for example in the supply channel 11 is recorded with an adjustable pressure. Via the supply channel 11 the respective rolled balls 10 of the respective rolling area 9 by means of the fluid with a respective one, in the radial direction of the smooth rolling tool 1 force applied to the outside and thereby against the respective inner circumferential surface 4 pressed.

Out 4 it can be seen that the respective roller ball 10 in a respective bag 12 of the supply channel 11 is recorded. By means of the bag 12 is the respective rolled ball 10 freely rotatable on the base body 5 held so that the respective roller ball 10 in any direction or about any axis of rotation relative to the base body 5 can rotate, through the respective pocket 12 in the radial direction of the base body 5 occurring, translational relative movements between the respective roller balls 10 and the main body 5 permissible, especially during the respective rolled ball 10 by means of the bag 12 , especially in the radial direction of the smooth rolling tool 1 , on the main body 5 is held. This means that the respective rolling ball 10 in the radial direction of the base body 5 and thus the smooth rolling tool 1 a piece relative to the base body 5 can translate back and forth. However, the respective roller ball can 10 not completely from the main body 5 solve and therefore not from the basic body 5 fall off. The respective bag also prevents 12 not just excessive, relative to the body 5 or in the radial direction of the base body 5 movements of the roller ball 10 to the outside, but the bag 12 also avoids excessive, relative to the body 5 movements of the roller ball, which run inwards in the radial direction 10 , so that they are not excessively far into the base body 5 can fall.

The fluid is fed through the supply channel 11 and thus by means of the respective bag 12 to the respective rolled ball 10 guided and touches the respective roller ball 10 directly. As a result, the respective roller ball 10 in the radial direction of the base body 5 externally acted upon by the aforementioned respective force, which depends on a pressure that that in the supply channel 11 has absorbed fluid. By adjusting the pressure of the fluid in the supply channel 11 the respective force can thus be set.

An in results from the respective force 4 reaction force denoted by R in the radial direction of the hollow body 5 inwards onto the respective roller ball 10 works. It also results from the respective force or from the respective reaction force R a frictional force F _R which, for example, between the respective rolled ball 10 and the respective inner circumferential surface 4 works.

Now become the smooth rolling tool 1 and thus the basic body 5 and with this the rolled balls 10 by one with the axial direction of the smooth rolling tool 1 coincident axis of rotation relative to the component 2 rotated or vice versa while the rolling balls 10 against the inner circumferential surfaces 4 are pressed, the balls rotate, for example, relative to the base body 5 by a respective parallel to the axial direction of the smooth rolling tool 1 extending axis of rotation and / or about a radial direction of the smooth rolling tool 1 extending axis of rotation. Furthermore, there is, for example, rolling and / or sliding between the respective ball and the respective inner circumferential surface 4 , whereby the inner peripheral surface 4 is rolled smooth.

Out 1 to 3 it is also particularly well recognizable that on the base body 5 Guide elements in the form of guide rails 13 are held over which the basic body 5 on the respective inner circumferential surface 4 Supportable in the radial direction and at a radial distance from the respective inner circumferential surface 4 is to be held. The respective guide rail 13 formed from a plastic.

How particularly good looking 1 is recognizable, is per rolling area 9 at least or exactly one management area 16 provided, between two each in the axial direction of the smooth rolling tool 1 immediately successive of the rolling areas 9 one of the leadership areas 16 is arranged. The respective management area 16 has several guide rails 13 on which in the circumferential direction of the base body 5 spaced from one another and arranged in succession. The number of guide rails preferably corresponds 13 of the respective management area 16 the number of rolling elements of the respective rolling area 9 , The respective guide rails are preferably also included 13 of the respective management area 16 in the circumferential direction of the base body 5 evenly distributed. In particular, the guide rails 13 and the respective rolling elements are arranged in such a way that in the axial direction of the smooth rolling tool 1 to the respective ball a respective guide rail 13 connects. Thus, for example, the respective ball (rolling ball 10 or rolling body) in the axial direction of the smooth rolling tool 1 at least partially through one of the guide rails 13 covered. This enables a particularly defined and gentle guidance of the smooth rolling tool 1 be guaranteed.

2 illustrates the process in a schematic representation. How from 2 is recognizable, the smooth rolling tool 1 initially along its axial direction relative to the component 2 moves, in particular such that the smooth rolling tool 1 through respective, also referred to as bores and through the respective inner circumferential lateral surfaces 4 limited bearing receptacles, which are designed as through openings, is pushed through in a first direction. Here an arrow illustrates 14 a first direction coinciding with the axial direction, in which the smooth rolling tool 1 relative to the component 2 is moved to the smooth rolling tool 1 to push through the bearings. This pushing through is also called pushing into the storage lane 3 designated. The smooth rolling tool is used during and / or after insertion 1 and the component 2 around the aforementioned, with the axial direction of the smooth rolling tool 1 coincident axis of rotation rotated relative to each other, in particular with an adjustable or predeterminable speed. It is conceivable that the smooth rolling tool 1 is rotated while the component 2 remains stationary or the component 2 is rotated while the smooth rolling tool 1 remains stationary. It is also conceivable that both the smooth rolling tool 1 as well as the component 2 be actively rotated.

After the smooth rolling, the smooth rolling tool 1 for example in an in 1 by an arrow 15 illustrated and the first Direction opposite, coinciding with the axial direction, second direction relative to the component 2 moved translationally to the smooth rolling tool 1 again from the Lagergasse 3 pull out.

The smooth rolling tool 1 is a hydrostatic smooth rolling tool which also supports the guide rails 13 having. By means of the smooth rolling tool, also referred to simply as a tool 1 In particular, bearing aisles for camshafts or eccentric shafts of an internal combustion engine can be rolled smooth.

It is preferably provided that the storage aisle 3 , in particular the inner circumferential surfaces 4 , processed, especially pre-processed, before smooth rolling. This preprocessing is also referred to as a semi-finish process and includes, for example, machining or machining of the warehouse aisle 3 , in particular the respective inner circumferential surface 4 ,

The fact that the ball in the radial direction of the base body 5 move a bit relative to this and about any axis of rotation relative to the base body 5 can rotate is a floating mounting of the respective ball on the base body 5 intended. Through this floating mounting, the respective ball can be particularly advantageously on the respective inner circumferential surface 4 and thus, for example, are pressed against the previously described bore, also referred to as a bearing aisle bore.

The respective rolling region preferably has 9 at least or exactly five rolling elements, which are preferably in the circumferential direction of the base body 5 are evenly distributed. In other words, the balls are preferably uniform in the circumferential direction of the base body 5 distributed over its diameter or over its circumference. The fluid is used, for example, as a coolant and / or lubricant, since the fluid is between the respective ball and the base body, for example 5 , especially from the supply channel 11 coming, can flow through. This allows the respective inner circumferential surface 4 lubricated and / or cooled during the smooth rolling. The aforementioned pressure, which the fluid has while the balls are pressed outward in the radial direction by means of the fluid, is preferably in a range from 15 bar up to and including 70 bar.

Depending on the surface resulting from the preliminary processing, the diameter of the respective inner circumferential lateral surface resulting from the preliminary processing 4 and depending on a desired surface quality after the smooth rolling, also referred to as the rolling process, the pressure of the fluid is selected or adjusted. The smooth rolling tool 1 , in particular the respective rolling area 9 , preferably has an outer diameter which is in a range from 17 millimeters up to and including 23 millimeters. The fact that the respective guide strip is formed from a plastic can cause undesirable damage to the storage aisle 3 be avoided.

The actual smooth rolling of the inner circumferential surface 4 takes place during the insertion of the smooth rolling tool, also known as retracting 1 into the component 2 and at the same time into the Lagergasse 3 instead, since this makes it possible to support the guide rails. Smooth rolling is a preferably force-controlled smoothing process in order to further smooth the surface resulting from the pre-processing.

The respective ball rotates, for example, at a speed of 3.61 meters per second, in particular relative to the base body 5 , A time that the respective inner circumferential lateral surface is rolled is, for example, in a range from 2.5 seconds to 3 seconds inclusive and is preferably 2.99 or 3 seconds. Preferably, the fluid, in particular while the balls are pressed outward in the radial direction by means of the fluid, has a temperature which is preferably greater than 25 degrees Celsius and less than 45 degrees Celsius. In the course of smooth rolling, for example, the surface is leveled by approximately 2.5 micrometers.

In 4 illustrates an arrow 16 that the component 2 and the smooth rolling tool 1 are rotated relative to each other, especially while the balls against the inner circumferential lateral surfaces 4 be pressed. The aforementioned speed is preferably 3,000 revolutions per minute, in particular while the pressure is preferably 70 bar.

Reference list

1

Smooth rolling tool

2

component

3

Lagergasse

4

inner circumferential surface

5

Basic body

6

outer circumferential surface

7

Double arrow

8th

Double arrow

9

Rolling area

10

Rolled ball

11

Supply channel

12th

bag

13

Guide rail

14

arrow

15

arrow

16

Leadership area

F _R

friction

L

Depository

R

Reaction force

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 0353376 A1 [0002]
• DE 102016002119 B3 [0003]
• EP 2828036 B1 [0004]

Claims (11)

Smooth rolling tool (1) for smooth rolling at least one inner circumferential surface (4) of a component (2), with a base body (5), with a rolling region (9) which has a plurality of spaced-apart, rotatable and successive ones in the circumferential direction of the base body (5) comprises the rolling body (10) held for the base body (5) for rolling the inner circumferential surface (4), and with at least one supply channel (11) for guiding a fluid, by means of which the rolling body (10) with a respective radial direction (7) force acting on the outside and thereby to be pressed against the inner peripheral surface (4), characterized by at least one second rolling region (9) following the rolling region (9) in the axial direction (8) and spaced from the rolling region (9), which a plurality of second Wa, which are successive in the circumferential direction of the base body (5) and are spaced apart from one another and rotatably held on the base body (5) lz body (10) for rolling a further inner circumferential surface (4) of the component (2), the second rolling body (10) via the supply channel (11) by means of the fluid with a respective one acting in the radial direction (7) outwards Force can be applied and thus pressed against the further inner circumferential surface (4). Smooth rolling tool (1) Claim 1 , characterized by guide elements (13) held on the base body (5), by means of which the base body (5) can be supported in the radial direction (7) on the respective inner circumferential surface (4) and at a radial distance from the respective inner circumferential surface ( 4) is to be kept. Smooth rolling tool (1) Claim 2 , characterized in that the respective guide element (13) is formed from a plastic. Smooth rolling tool (1) Claim 2 or 3 , characterized in that the respective guide element (13) is designed as a guide rail (13) and thus has a longitudinal extent extending in the axial direction (8). Smooth rolling tool (1) according to one of the preceding claims, characterized in that the respective rolling body (10) is designed as a ball (10). Smooth rolling tool (1) according to one of the preceding claims, characterized in that the respective rolling body (10) is held on the base body (5) so as to be translationally movable in the radial direction (7) relative to the base body (5). Smooth rolling tool (1) according to one of the preceding claims, characterized in that the respective rolling bodies (10) are accommodated in a pocket (12) of the supply channel (11) and the fluid can thus be acted upon directly. Method for smooth rolling at least one inner peripheral surface (4) of a component (2) by means of a smooth rolling tool (1), which comprises: - a base body (5); - A rolling region (9) which has a plurality of rolling bodies (10) which are successive in the circumferential direction of the main body (5) and are spaced apart from one another and rotatably held on the main body (5), and - At least one supply channel ( 11), by means of which a fluid is guided, by means of which the respective rolling elements (10) are acted upon by a respective force acting in the radial direction (7) and thereby pressed against the inner circumferential surface (4), while the component (2) and the smooth rolling tool (1) is rotated relative to one another about an axis of rotation, characterized in that the smooth rolling tool (1) has at least one second rolling area (9) following the rolling area (9) in the axial direction (8) and spaced apart from the rolling area (9) ), which has a plurality of spaced-apart and rotatable on the base body (5) which are successive in the circumferential direction of the base body (5) second roller body (10) held for rolling a further inner circumferential lateral surface (4) of the component (2), the second roller body (10) via the supply channel (11) by means of the fluid with a respective one in the radial direction (7) externally acting force and thereby pressed against the further inner circumferential lateral surface (4), while the component (2) and the smooth rolling tool (1) are rotated relative to each other about the axis of rotation. Procedure according to Claim 8 , characterized in that the component (2) and the smooth rolling tool (1) are rotated relative to each other at a speed which is in a range from including 2000 revolutions per minute to 5000 revolutions per minute, in particular in a range including 2500 revolutions per minute Minute up to and including 4000 revolutions per minute and preferably in a range from 2500 revolutions per minute up to and including 3500 revolutions per minute. Procedure according to Claim 8 or 9 , characterized in that the fluid has a pressure which is in a range from 15 bar up to and including 70 bar. Procedure according to one of the Claims 8 to 10 , characterized in that a component (2) of an internal combustion engine having at least one bearing lane (3) is used as the component (2), the inner circumferential lateral surfaces (4) being formed by the bearing lane (3), which are formed by means of the smooth rolling tool (1 ) is rolled smooth.

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