EP3049203A2

EP3049203A2 - Method for producing a sintered part with high radial precision, and set of parts comprising joining parts to be sintered

Info

Publication number: EP3049203A2
Application number: EP14803040.6A
Authority: EP
Inventors: Alexander TAUSEND; Kerstin Ziegler
Original assignee: GKN Sinter Metals Holding GmbH
Current assignee: GKN Sinter Metals Holding GmbH
Priority date: 2013-09-23
Filing date: 2014-09-19
Publication date: 2016-08-03
Also published as: US20160207107A1; WO2015043734A3; CN105939802A; JP2016532771A; DE102013015677A1; JP6457499B2; CN105939802B; US10413967B2; WO2015043734A2

Abstract

The invention relates to a method for producing a sintered part (1) with a high radial precision. The sintered part (1) is made of at least one first joining part (2) to be sintered and a second joining part (3) to be sintered, and the method has at least the following steps: - joining the first joining part (2) with the second joining part (3), and - bringing about the high radial precision, having a step of deforming at least one radial deformation element (4, 5) which is preferably positioned so as to adjoin a joint contact zone (7), wherein the deformation of the radial deformation element is caused at least by means of a calibration tool and is carried out at least substantially as a plastic deformation of the radial deformation element (4, 5). The invention further relates to a set of parts for joining the joining parts to be sintered into a sintered part (1) with a high radial precision.

Description

Process for producing a sintered part with high precision radial precision and parts set with sintered joining parts

The present invention relates to a method for producing a sintered part with high precision radial precision. Furthermore, the invention relates to a parts set with Sinterfügeteilen for joining the Sinterfügteile to a sintered part with high-precision radial precision.

A common method for the aftertreatment of sintered parts is a calibration of a sintered part. By repressing or calibrating a dimensional stability of the sintered part is effected. In the case of components provided for rotation, in many cases calibration in particular involves causing a dimensional accuracy of the surfaces which are oriented parallel to a rotation axis of the sintered part. Calibration is carried out under high pressure in a calibration die. In cases in which special demands are placed on the dimensional stability of the sintered part, however, in many cases it is still necessary in this case for additional machining steps to be carried out, such as, for example, grinding, turning, milling or drilling. For this, however, the disadvantage of the additional work involved in the further processing steps must be accepted.

The invention has for its object to be able to produce and provide a sintered part with high-precision radial precision, which is improved in its properties and in its production costs over the previously known sintered parts. The object is achieved with a method for producing a sintered part with highly accurate radial precision with the features of claim 1 and with a set of parts with sintered joining parts for joining the sintered parts to a sintered part with high-precision radial precision with the features of claim 10. Further advantageous embodiments and developments will become apparent from the following description. One or more features of the claims, the description as well as the figures may be linked with one or more features thereof to further embodiments of the invention. In particular, one or more features of the independent claims may be replaced by one or more other features of the description and / or figures. The proposed claims are to be construed only as a draft to formulate the subject matter without, however, limiting it. A method is provided for producing a sintered part with high precision radial precision. The sintered part is produced at least from a first sintered joining part and a second sintered joining part. The method comprises at least the following steps:

- joining the first sintered joining part with the second sintered joining part;

Inducing highly accurate radial precision, comprising deforming at least one radial deformation element. The deformation of the radial deformation element is effected at least by means of a calibration tool. The

Deformation of Radialverformungselement.es takes place at least substantially as plastic deformation of the Radialverformungselement.es.

The term sintered part refers in particular to the fact that the sintered part is a component which has already been subjected to a sintering process. It is preferably provided that no further sintering of the sintered part is required any longer, but it may also be possible that further sintering of the sintered part is provided and / or required. The term of the sintered joining part likewise designates an already sintered component which is provided for joining to a sintered part by means of joining with at least one further sintered joining part.

The term highly precise radial precision designates in particular a dimensional stability of a lateral surface of the sintered part, at least along a partial section of the axial extent of the sintered part, being oriented in parallel to a designated rotational axis of the sintered part.

In a preferred embodiment, the high-precision radial precision is a radial precision at at least one axial position of the axial extent of the sintered part.

In a particularly preferred embodiment of the method, the high-precision radial precision is a radial precision along the entire axial extension of the sintered part, the lateral surface of the sintered part particularly preferably having the highly accurate radial precision. In a specific embodiment, the sintered part is an essentially rotationally symmetrical sintered part which has a lateral surface which corresponds to a lateral surface of a circular cylinder. In this particular embodiment, the high-precision radial precision relates to an outer diameter of the lateral surface, wherein for all outer diameter within accepted tolerances the diameter reaches its required dimensional accuracy at each position of the axial extension of the sintered part.

In particular, the term of high precision radial precision refers to a precision in a radial direction of the sintered part having a tolerance of less than +/- 0.050 mm in the radial direction, so that no extension deviates more or less than 0.050 mm from its intended value of dimensional stability.

In a preferred embodiment of the invention, it is provided that the highly accurate radial precision has a tolerance of less than +/- 0.025 mm, so that no deviation of an extent in the radial direction of more than 0.025 mm higher or less than the intended value of dimensional stability occurs , In a particularly preferred embodiment of the invention, it is provided that the radial precision has a tolerance of less than +/- 0.015 mm, that is, no extent deviates more or less than 0.015 mm from its intended value of dimensional accuracy.

The term of the calibration tool may on the one hand denote a separate tool, by means of which a calibration of a previously sintered part, in particular in another tool, is calibrated. However, it can also be provided, for example, that the term of the calibration tool designates a region of a tool in which not only the first sintered part and the second sintered part but also the calibration have already been joined. For example, it may be provided that a follow-up tool is used, in which a joining takes place in a sequential sequence and a calibration in a further step. It can also be provided, for example, that the joining as well as the calibration take place at least at the same time at the same time, so that, for example, joining without a discrete transition is converted into the calibration. For example, it may be provided that the step of bringing about the highly accurate radial precision in a region of the calibration tool has already begun at a point in time during which calibration is already taking place. In a specific embodiment of the method, it can be provided, for example, that the bringing about of the highly accurate radial precision is essentially brought about by the deformation of the radial deformation element or of the radial deformation elements.

For example, it can be provided that a substantially by the deformation of the radial deformation element or the radial deformation elements inducing the high-precision radial precision is understood to mean that at least 75% of the volume change required to induce the highly accurate radial precision contributed by volume change of the radial deformation element or components becomes.

For example, it can be provided that a substantially by the deformation of the Radialverformungselements or the Radialverformungselemente inducing the highly accurate radial precision is understood to mean that at least 85% of the required for inducing the highly accurate radial precision volume change by volume change of the radial deformation element or the radial deformation elements is contributed. For example, it may be provided that a substantially by the deformation of the radial deformation element or the radial deformation elements inducing the highly accurate radial precision is understood to mean that at least 95% of the required volume change for inducing the high-precision radial precision by volume change of the radial deformation element or the Radialverfor- contributed elements becomes.

For example, it can be provided that a substantially by the deformation of the Radialverformungselements or the Radialverformungselemente inducing the highly accurate radial precision is understood to mean that at least 99% of the required for inducing the highly accurate radial precision volume change by volume change of the radial deformation element or the radial deformation elements is contributed.

The volume change relates in each case to the volume change of the total volume of the sintered joining parts and of the radial deformation elements. In a further embodiment of the method, it can be provided, for example, that an outer deformation part is positioned within the joining step, so that at least the first sintered joining part and / or at least the second sintered joining part are at least partially circulated through the outer deformation part. The outer deformation part then forms a radial deformation element, which is formed as an outer radial deformation element.

The term of the outer deformation part designates an independent component which is positioned in addition to the first sintered joining part and the second sintered joining part, for example before the joining or during the joining of the first sintered joining part with the second sintered joining part such that the first sintered joining part and / or the second sintered joining part be at least partially circulated. The term circulating the first sintered joining part and / or the second sintered joining part through the outer deformation part refers to such an arrangement in which the outer deformation part at least partially encloses a lateral surface of the first sintered joining part and / or a lateral surface of the second sintered joining part, and / or , preferably, on which it rests touching.

Particularly preferably, it is provided that the outer deformation part rests on an edge, at least in regions, on which the first sintered joining part and / or the second sintered joining part are joined.

The advantage of arranging an outer deformation part is that, in the course of inducing the high-precision radial precision, the degrees of freedom of the outer deformation part cause it to adapt very well to the calibration tool and its reference quality with regard to the position and / or positional tolerances and / or shape quality , that is, in particular the radial precision, can accept.

In particular, it can be provided that the outer deformation part consists of a comparatively easily deformable material compared to the first Sinterfügeteil and / or the second Sinterfügeteil, in particular plastically deformable material, so that a deformability of the outer deformation part is preferably carried out.

For positioning the outer deformation part can be provided, for example, that the outer deformation part is retained in the axial direction by a portion of the first sintered joining part, which has an extension in the radial direction, which is greater than the extension of the outer deformation part and / or that in an axial direction, the outer deformation part is recovered by a portion of the second Sinterfügeteils having a portion having a radial extent which is greater than the radial extent of the outer deformation portion , In particular, by arranging at least one retaining projection of the first sintered joining part and / or at least one retaining projection of the second sintered joining part, axial positioning of the outer deformation part can take place.

In an embodiment of the method, in which both the first sintered joining part and the second sintered joining part each have a corresponding retaining projection with a spacing of the projections in the joined state of the sintered part that corresponds to an axial extension of the deformation part, an exact positioning of the part is achieved in the course of the joining Deformation caused. In another embodiment of the method, it can be provided, for example, that an inner deformation part is positioned in the context of the joining, and the inner deformation part:

at least one first inner surface of the first sintered joining part, and / or at least one second inner surface of the second sintered joining part. at least partially covering.

In a preferred embodiment, the inner deformation part, which is positioned in the context of the joining, covers the first inner joining surface of the first sintered joining part after positioning and / or

- Completely from the second inner surface of the second Sinterfügeteils.

The inner deformation part then acts as a radial deformation element, which is formed as an inner radial deformation element. Inter alia, an inner radial deformation element arranged on at least one inner surface has the advantage that an exact positioning of the first sintered joining part to the second sintered joining part is favored. The term inner surface means an inner surface of a recess, which is thus located in an interior of the joined sintered part, wherein an interior should be characterized in that the interior is at least partially enveloped by the outer surface. The term outer surface refers to a lateral surface of the survey. The inner deformation part is located at least in some areas between an inner surface and an outer surface. However, it can also be provided that the inner deformation part extends over an axial total extension of an inner joining surface and / or an axial total extension of an outer joining surface. The positioning of the outer deformation part and / or the inner deformation part in the context of joining is to be understood as meaning that the presence of the first sintered joining part, the second sintered joining part and the outer and / or inner deformation part for producing a sintered part with highly accurate radial precision the inner and / or outer deformation part takes place. The positioning can be carried out, for example, as a first step independently of the joining of the first sintered joining part with the second sintered joining part, for example by putting the deformation part over the sintered joining part or over the sintered joining parts or inserting the deformation part into the sintered joining part or into the sintered joining parts. It may also be provided, for example, that the outer and / or the inner deformation part is positioned in loose fit, with frictional and / or frictional connection. It can also be provided that at least in one part of the joining step, the joining of the outer and / or the inner deformation part takes place, that these process steps thus at least partially overlap. It is envisaged that a number of more than one inner deformation part and / or more than one outer deformation part is positioned in the context of the joining.

In a further embodiment of the method, it can be provided, for example, that one, several or preferably all of the deformation parts are joined to one or more sintered joining parts during the joining process in a frictional, positive, force and / or material-liquid manner. In another embodiment, it may be provided, for example, that during the induction of the highly accurate radial precision, one, several, preferably all, deformation parts are connected to one or more sintered joining parts in a friction, form, force and / or materially bonded manner.

Intermediate stages can also be provided so that at least at times during the process at least partially the joining and at least partly the bringing about of the highly accurate radial precision take place simultaneously. It can also be provided, for example, that the at least one deformation part is connected to one or more sintered joining parts, while the joining and the bringing about of the highly accurate radial precision are respectively carried out at least partially simultaneously.

An at least partially simultaneous performance of the joining and the bringing about of the highly accurate radial precision has the advantage that the process duration is reduced and a higher accuracy in the radial precision and in particular in the radial positioning of the sintered joining parts relative to one another can be achieved.

In a further embodiment of the method can be provided, for example, that

at least one region of at least one inner surface of the first sintered joining part, and / or

at least one region of at least one inner surface of the second sintered component, and / or

at least one region of at least one outer surface of the first sintered joining part, and / or

at least one region of at least one outer joining surface of the second sintered joining part has at least one radial projection which forms a radial deformation element which is designed as an inner radial deformation element.

The term radial embossing designates a protrusion which originates from the first sintered joining part and / or from the second sintered joining part, which embossment is preferably an integral part of the sintered joining part and which at least partially forms a radial one Direction is sublime. An advantage of such a design of a embossment is that the radial embossment can already be molded into the green compact during the powder pressing for producing a green body, which later becomes the sintered joining part by means of sintering. For example, the radial projection can be formed by negative imaging in a press die into the later sintered joining part

A radial embossment is an embossment which also has at least one extension component in a radial direction. For example, the radial projection may be a line elevation, which has the advantage that such a line elevation can be particularly easily imaged during the pressing of powder for producing a green compact, which later becomes the sintered joining part. Likewise, however, it may also be provided, for example, that the embossing can be, for example, a nub or another geometric shape.

The presence of a radial embossing has the advantage that, when joining the individual parts, for example the first sintered joining part and the second sintered joining part, the individual parts align themselves at the contact surfaces to the tool elements of the joining tool and / or the calibration tool. Precise production and positional tolerance of the tool parts while at the same time providing a stable tool design leads, with more than one existing shoulder, to the fact that form deviations of the sintered joining parts are compensated by locally different degrees of deformation within the passages. Due to the presence of the passages, a small radial deviation from the optimum position to exceeding the yield stress in the contact zone is sufficient. As a result, plastic deformation, in particular of the embossments, is effected as a result even with slight deviations and the resulting low resulting pressures. At the same time, the material of the sintered joining part, which has embossments, can flow into a free space, which is located between at least a first and a second embossment. The presence of at least one recess thus leads to a very precise possible alignment of at least the first sintered joining part and the second sintered joining part to one another.

Particularly preferred is an embodiment of the method is provided in which a number of at least two Erhabungen is present. Particularly preferred is an over an entire circumference, preferably evenly arranged attachment of an even higher number than two Erhabungen provided. Likewise, for example, It can be seen that piles are present on both the first sintered joining part and the second sintered joining part.

A further embodiment of the method provides that the bringing about of the high-precision radial precision takes place at least partially simultaneously with the joining of the first sintered joining part and the second sintered joining part. It may be provided, for example, that a joining of the first sintered joining part and the second sintered joining part as well as bringing about the high-precision radial precision are carried out in succession with the aid of a follower tool, so that the joining of the first one is only based on the position of the first joining part and the second joining part Sinterfügeteils and the second sintered joining part in the induction of highly accurate radial precision given, with a continuous as well as a discontinuous transition can be provided. A further embodiment of the method may for example provide that

- For joining at least a first process step is carried out by means of at least one joining tool and / or

at least one second process step by means of a calibration tool designed as a separate calibration tool and / or by means of a calibration tool, which is designed as a calibration region of a combined follower tool, for effecting the highly accurate radial precision.

Such an embodiment of the method for producing a sintered part with highly accurate radial precision has the advantage that the calibration tool can be adjusted and / or replaced independently of the tool used for the joining, whereby a higher flexibility is accomplished.

A further embodiment of the method for producing a sintered part with highly accurate radial precision can provide, for example, that after the high-precision radial precision has been brought about, the sintered part is removed from the calibration tool with highly accurate radial precision. It is therefore intended that a removal takes place as a sintered part with high-precision radial precision. One of the advantages of removing the sintered part from the calibration tool as a sintered part with high precision radial precision is that immediately after the calibration desired highly accurate radial precision is present. This results in the advantage that the reproducibility of the diameter and the quality of the reference and shape properties after plastic deformation or after calibration no longer needs to be improved by a post-processing. In particular, for example, no machining, for example, the diameter of the lateral surfaces and / or the reference surfaces and functional surfaces required, so it must, for example, no grinding, turning, milling and / or drilling done. This results in the considerable advantage of a less time-, material- and labor-intensive production of the sintered parts.

In one embodiment of the method, the method comprises a pressing together of the first sintered joining part and the second sintered joining part under axial pressing pressure effected by means of a pressing tool. Here, the height-precision molding height is brought about by the pressing against each other;

The term joining surface here refers to a side on which, in the case of a sintered part provided for a rotational movement, the axis of rotation is oriented perpendicularly or at least substantially perpendicularly. The term "joint surface" includes pits or depressions. It is thus not necessary for a joint surface to be designed as a completely flat surface.

The term height-accurate molding height is to be understood as meaning that the sintered part has a molding height which provides for immediate use of the sintered part for its intended use. In particular, it is provided that a mechanical reworking, for example by machining, in particular, for example, a grinding or turning, is no longer necessary.

The pressing together of the first sintered joining part and the second sintered joining part by means of a pressing tool is to be understood as causing an axial pressing pressure on at least one of the sintered joining parts. The press tool does not necessarily have to be the identical tool with which a joining is provided. The application of axial pressing pressure is not to be understood as meaning that pressure is exerted directly on one or more of the first and second sintered joining parts, but it may also be provided that, for example, more than two sintered joining parts are joined and that only one of the first sintered joining part and of the second sintered joining part or none of the first sintered joining part and the second sintered joining part comes into direct contact with the pressing tool. In a joined state of the sintered part, the term of pressing against one another comprises, in particular, embossing of the sintered part, that is to say pressurization in an axial direction in order to bring about the intended height dimension.

In one embodiment of the invention may be provided in particular that the molding height has a tolerance of less than +/- 0.05 mm, so that the distance of the end faces of the sintered part is less than 0.05 mm greater or smaller than the intended value.

In a preferred embodiment of the invention it is provided that the molding height has a tolerance of less than +/- 0.025 mm, that is, that the distance of the end faces of the sintered part is less than 0.025 mm greater or smaller than the intended value.

In a particularly preferred embodiment of the invention, it is provided that the molding height has a tolerance of less than +/- 0.15 mm, so that the distance of the end faces of the sintered part is less than 0.015 mm greater or smaller than the intended value.

In one configuration of the method, provision can be made for the first sintered joining part to have at least one first deformation element arranged on the first joining face and / or the second sintered joining part to have at least one second deformation element arranged on the second joining face. For example, it is provided that deformation of at least one of the deformation elements is brought about by means of pressing against one another.

The term of the deformation element may, for example, denote an embossment which is present in one piece in the first sintered joining part as the first deformation element and / or in the second sintered joining part as the second deformation element.

A further embodiment of the method may provide, for example, that the first deformation element arranged on the first joining surface is introduced into a first receiving trough arranged on the second joining surface. It can likewise be provided that at least the second deformation element arranged on the second joining surface is introduced into a second receiving trough arranged on the first joining face becomes. This causes a positioning of the deformation elements is effected in a direction oriented perpendicular to the axial direction.

It can be provided, for example, that the joining, the bringing about of the high-precision radial precision and the embossing take place in a same process step.

It can also be provided, for example, that joining takes place as a first step and then as a further step embossing and / or bringing about the highly accurate radial precision takes place, so that joining and embossing are carried out as sequential process steps.

Likewise, it can be provided, for example, that the joining continuously merges into the embossing and / or in the bringing about of the highly accurate radial precision by carrying out both process steps in a same tool.

The sequence and the configuration of the transition and / or the overlapping of the method steps joining, embossing and / or bringing about the highly accurate radial precision can be performed in any order. Another aspect of the invention, which may be pursued independently as well as in combination with the other aspects of the invention, relates to a kit of parts with sintered joining parts for joining the sintered joining parts to a sintered part with high precision radial precision. The parts set has at least:

A first sintered joining part,

- A second Sinterfügeteil as well

- A radial deformation element.

Each of the first sintered joining part and the second sintered joining part is a sintered part which has, for example, a sintered steel, a sintered metal or a sintered ceramic. The first sintered joining part and / or the second sintered joining part are each preferably a component which consists entirely of a sintered metal, a sintered steel or a sintered ceramic. The term of the sintered joining part is to be understood as meaning that the first sintered joining part is suitable as well as for that is provided to be joined with the second sintered joining part to a sintered part or to a l en of a sintered part.

It can therefore also be provided, for example, that one or more further components are additionally provided for joining the sintered part, or, for example, are also possible or necessary for use. Such further components may be, for example, further sintered joining parts; but it may also be, for example, in addition to the Sinterfügeteilen provided deformation parts, which form one or more radial deformation elements.

It can therefore be provided that the parts set in addition to the first Sinterfügeteil and the second Sinterfügeteil still has any further number of Sinterfügeteilen or other components. The term radial deformation element refers to an element which is intended for deformation in a radial direction. A radial direction denotes a direction which is perpendicular or at least substantially perpendicular to an axial direction of the sintered part. On the other hand, it should not necessarily be implied that the sintered part must be a rotationally symmetric part. On the contrary, in the case of sintered parts provided for a rotation or a partial rotation, an axial direction lies on the axis of rotation. For the special case of a rotationally symmetrical component or an essentially rotationally symmetrical component, an axial direction lies on the axis of symmetry. The radial deformation element can be, for example, an element which is integrally connected to the sintered joining part. However, it can also be provided that the radial deformation element is a separate element which is applied to the first and / or the second sintered joining part before or during the joining of the sintered part.

In an embodiment of the parts set, it can be provided, for example, that the set of parts has an inner deformation part, which in the context of joining

at least partially covering and / or at least partially covering a first inner surface of the first sintered joining part 53

15

- At least a second inner surface of the second sintered part is at least partially covering positionable and forms a radial deformation element, which is designed as an inner Radialverfor- tion element.

For example, it can be provided that, in addition to a covering, at least partial or complete covering is present, whereby a contact of the inner deformation part with the first inner surface and / or the second inner surface is called.

The term of the inner radial deformation element designates a radial deformation element which, during the joining, is circulated at least over part of the first sintered joining part and / or at least part of the second sintered joining part, so that in the finished joined sintered part the inner radial deformation element at least partially located in an interior of the sintered part.

In another embodiment of the kit of parts, for example, be provided that the kit of parts has an outer deformation part, which in the context of joining

- At least the first Sinterfügeteil at least partially encircling and / or

- At least the second Sinterfügeteil is at least partially circumferentially positionable and forms a radial deformation element, which is designed as an outer radial deformation element.

The term of the outer radial deformation element refers to such a radial deformation element which forms at least part of the lateral surface of the sintered part with a part of its surface during joining and after joining, then in the joined sintered part.

For example, it can be provided that the first sintered joining part and / or the second sintered joining part are sintered joining parts which at least partially have an approximately annular or annular cross section, and that further towards the outer radial deformation element is designed as a ring. It may, for example, be provided that the radial deformation element formed as a ring has an inner diameter that substantially corresponds to the outer diameter of the first sintered joining part and / or the second sintered joining part, so that the outer deformation part in the form of a ring at least partially surrounds the sintered joining parts can and thereby forms a radial deformation element, which is designed as an outer radial deformation element.

In a further embodiment of the parts set can be provided, for example, that

the first sintered joining part has a first radial retaining projection and / or

- The second sintered joining part has a second radial retaining projection for axially positioning the outer deformation part in the joined state of the sintered part.

The radial retaining projection is a radial extent which extends over at least an angular range of the sintered joining part in the radial direction beyond radial extensions located at other axial positions of the sintered joining part, which causes a first sintered joining part and / or the second sintered joining part In at least partially circumferential arrangement positioned outer deformation part is positioned by the projections in the axial direction. In a further embodiment of the parts set can be provided, for example, that

at least one region of at least one inner surface of the first sintered joining part,

at least one region of at least one inner surface of the second sintered joining part,

at least one region with at least one outer surface of the first sintered joining part and / or

at least one region of at least one outer surface of the second sintered component has at least one radial embossment, which is designed as an inner radial deformation element.

It can be provided, for example, that the radial projection causes a press fit during the joining.

The concept of the inner radial deformation element includes that in the joined state of the sintered part, the inner radial deformation element is located in the interior of the sintered part. A radial embossment is in particular characterized in that it is formed out of the material of one or more of the sintered joining parts and is formed integrally with the sintered joining part or the sintered joining parts. Due to the presence of a radial embossment, there is the advantage that, due to the reduction of the contact surface, which results between the first sintered part and the second sintered part during joining, the positioning of the radial embossment, which is easier during the joining process, is particularly advantageous the first sintered part is significantly improved in relation to the second sintered part.

A further embodiment of the kit of parts may, for example, have one or more radial recesses which are formed in one of the geometric shapes of the spherical section, spherical segment stump, truncated cone, cuboid, trapezoidal stump, truncated pyramid, or linear line.

In the case where a radial protrusion is formed as a line shape, it is preferably provided that the radial protrusion is oriented in a direction aligned parallel to an axial direction of the first sintered joining part and / or to an axial direction of the second sintered joining part. By forming the radial projection as a line extension, which is oriented in a direction parallel to an axial direction of the first sintered joining part and / or in a direction parallel to an axial direction of the second sintered joining part, has the advantage that in the course of the production of the first sintered joining part and / or the second sintered joining part by means of axial pressing of the compact and / or the green compact in a correspondingly shaped die a particularly advantageous production of Sinterfügeteils is possible.

In a further embodiment of the parts set can be provided, for example, that having a minimum extension of an upper contact surface of 0.2 mm in at least one dimension of the contact surface,

- Has an extension of a base area of the base of 0.4 mm to 2.0 mm in at least one dimension and / or

- Has a height of 0.1 mm to 2.0 mm between the base and the contact surface.

An embodiment of the embossment according to the above-mentioned values has been found to be particularly advantageous in that the embossment holds bulk material to sufficient extent to adequately position the first sintered joining member to the second by means of plastic flow of material of the embossment To allow Sinterfügeteils. Furthermore, at the same time, however, the cavity resulting between the first sintered joining part and the second sintered joining part is small enough to be closed, for example, by plastic deformation and / or not to preclude proper functioning of the sintered part.

In a further embodiment of the parts set can be provided, for example, that the sintered part with high-precision radial precision is a rotor for a camshaft adjuster, a pump ring, an oil pump housing, a stator or a shock absorber piston.

Furthermore, a use of a parts set is provided in order to accomplish a joining to a sintered part with highly accurate radial precision, wherein the sintered part can be removed from a calibration tool with highly accurate radial precision. Preferably, a use of one of the explained methods is provided for the joining to the sintered part.

Further advantageous embodiments and developments will become apparent from the following figures. However, the details and features of the figures are not limited to these. Rather, one or more features having one or more features from the above description may be linked to new designs. In particular, the following statements do not serve as a limitation of the respective scope, but explain individual features and their possible interaction with each other. Show it:

1 shows an exemplary embodiment of a sintered part as a stator made of a sintered joining part and a second sintered joining part and a radial deformation element designed as an outer deformation part;

2 shows an exemplary embodiment of a sintered part as a stator made of a sintered joining part and a second sintered joining part and a radial deformation element designed as an outer deformation part in cross section;

3 shows an exemplary embodiment of a sintered part as an oil pump housing comprising a first sintered joining part, a second sintered joining part and a visible radial deformation element designed as an outer radial deformation element; 4 shows an exemplary embodiment of a sintered part as an oil pump housing comprising a first sintered joining part, a second sintered joining part and a visible radial deformation element formed as an outer deformation part in cross-section, further illustrating a radial deformation element designed as an inner deformation part;

5 shows an exemplary embodiment of a sintered part of a first sintered joining part and a second sintered joining part with a radial deformation element designed as a radial projection in cross-section; 6 shows an exemplary embodiment of a sintered part comprising a first sintered joining part and a second sintered joining part with a radial deformation element designed as a radial projection in a plan view.

FIG. 1 shows an exemplary embodiment of a sintered part 1 in an oblique view. The sintered part 1 is a stator of a camshaft adjuster. The sintered part 1 has a first sintered joining part 2 and a second sintered joining part 3, which are joined together. Furthermore, the sintered part 1 has an outer deformation part 5, which forms a radial deformation element designed as an outer radial deformation element. The outer deformation part 5 is formed in the embodiment shown as a ring. The axial extension 12 of the outer deformation part 5 corresponds to a distance of a first radial retention projection 13 of the first sintering part. partly by a second radial retaining projection 14, wherein in the embodiment shown, the first radial retaining projection 13 and the second radial retaining projection 14 are formed rotationally symmetrical with respect to the axis of rotation 15 of the sintered part 1. The first radial retaining projection 13 and the second radial retaining projection 14 bring about axial positioning of the outer deformation part 5. The radial extent of the outer deformation part 5 is larger at any point than the radial extent of both the first sintered joining part 2 and the second sintered joining part 3. This has the effect that during the calibration, a plastic flow of the outer deformation part contributes significantly to the bringing about of the highly accurate radial precision.

FIG. 2 shows a cross-sectional illustration containing the axis of rotation 15 of the embodiment of a sintered part 1 to be taken in FIG. 1 with highly accurate radial precision.

FIG. 3 shows a further exemplary embodiment of a sintered part 1 in an oblique view. The exemplary embodiment in FIG. 3 is an oil pump housing which has a first sintered joining part 2 and a second sintered joining part 3. Furthermore, the sintered part 1 of FIG. 3 has an outer deformation part 5, which is formed as a ring. The formed as a ring outer deformation part 5 completely surrounds the first Sinterfügeteil 2 and is formed adjacent to a portion of the outer surface of the first Sinterfügeteils 2. Also, FIG. 3 shows an inner deformation part 4, which is likewise designed as a ring. FIG. 4 shows a cross-sectional view of the sintered part shown in FIG. 3. In addition to the features of the sintered part 1 already shown in FIG. 3, the illustration shown in FIG. 4 also shows a first retaining projection 13 which, together with the second sintered joining part 3, effects axial positioning of the outer deformation part 5. Furthermore, the cross-sectional illustration of FIG. 4 shows an inner deformation part 4 introduced in the interior of the sintered part 1. The inner deformation part 4 is also configured as a ring in the illustration shown and is introduced into a recess of the second sintered part 3. The dimensions and the geometric configuration of the ring are designed such that the inner deformation part 4 completely covers a second inner surface 9 of the second sintered joining part 3 over the entire part of its axial extent. The inner deformation part 4 covers a first outer surface 10 of the first sintered layer. Part 2 completely over the entire part of its axial extent completely. between the first outer joining surface 10 and the second inner joining surface 9, the inner deformation part 4 is press-fitted in the embodiment shown. The arrangement of the inner deformation part as shown causes axial positioning of the first sintered joining part 2 to the second sintered joining part 3 to be effected with high accuracy as a result of plastic deformation of the inner deformation part 4 acting as the inner radial deformation element. An axial positioning of the inner deformation part is performed by the second retaining projection 14, which is formed in the recess of the second Sinterfügeteils.

FIG. 5 shows a further exemplary embodiment of a sintered part 1. The sintered part 1 shown in FIG. 5 is a sintered part 1, which is joined by a first sintered joining part 2 and a second sintered joining part 3. The first sintered joining part 2 has a recess whose inner circumferential surface forms a first inner surface 8. Into the recess into the second Sinterfügeteil 3 is introduced. There is a particular frictional connection of the two Sinterfügeteile by by radial elevations formed as 6 inner Radialverformungselemente which are arranged on a second Außenfügefläche 9 of the second Sinterfügeteils 3 and the plastic in the insertion of the second Sinterfügeteils 3 in the recess of the first Sinterfü- are deformed.

While the radial recesses of the representation of FIG. 5 can not be found, they can be taken from the plan view in FIG. 6.

Claims

claims

Method for producing a sintered part (1) with highly accurate radial precision, wherein the sintered part (1) consists of at least

a first sintered joining part (2) and

a second sintered joining part (3)

will be produced,

and where

the method comprises at least the following steps:

Joining the first sintered joining part (2) to the second sintered joining part (3),

Causing the highly accurate radial precision, comprising deforming at least one radial deformation element, which is preferably positioned adjacent to a joining contact zone, wherein the deformation of the radial deformation element is effected at least by means of a calibration tool and at least substantially as plastic deformation of the radial deformation element ,

A method according to claim 1, characterized in that an outer deformation part (5) in the context of joining

- At least the first Sinterfügeteil (2) at least partially encircling and / or

- At least the second Sinterfügeteil (3) at least partially encircling

is positioned and the outer deformation part (5) forms a formed as an outer radial deformation element radial deformation element.

A method according to claim 1 or claim 2, characterized in that an inner deformation part (4) in the context of joining

- At least a first inner surface (8) of the first Sinterfügeteils (2) at least partially covering and / or

- At least a second inner surface (9) of the second Sinterfügeteils (3) at least partially covering

is positioned and the inner deformation part (4) forms a formed as an inner radial deformation element radial deformation element.

A method according to claim 2 or claim 3, characterized in that one, several, preferably all, deformation parts during joining friction, form, force and / or materially connected to one or more Sinterfügeteilen and / or that one, several, preferably all, deformation parts are friction, form, force and / or cohesively connected with one or more sintered joining parts during the production of highly accurate radial precision.

Method according to one of the preceding claims, characterized in that

at least one region of at least one inner surface (8, 9) of the first sintered joining part (2), and / or

at least one region of at least one inner surface (8, 9) of the second sintered joining part (3), and / or

- At least a portion of at least one Außenfügefläche (10, 1 1) of the first Sinterfügeteils (2), and / or

at least one region of at least one outer joining surface (10, 11) of the second sintered joining part (3)

has at least one radial projection (6) which forms a radial deformation element designed as an inner radial deformation element.

Method according to one of the preceding claims, characterized in that the bringing about of the highly accurate radial precision takes place at least partially simultaneously with the joining of the first sintered joining part (2) and the second sintered joining part (3).

Method according to one of the preceding claims, characterized in that

at least one second process step is carried out by means of a calibration tool designed as a separate calibration tool and / or by means of a calibration tool designed as a calibration region of a follower tool for bringing about the highly accurate radial precision.

Method according to one of the preceding claims, characterized in that after the induction of the highly accurate radial precision, removal of the sintered part (1) from the calibration tool takes place as a sintered part with highly accurate radial precision. Method according to one of claims 1 to 8, characterized gekennzeicnnet, Aass for producing the sintered part (1) a pressing against each other of a first joining surface of the first Sinterfügeteils (2) and a second joining surface of the second Sinterfügeteils (3) is effected under means of a pressing tool effected axial pressing pressure , in which

Preferably, the first sintered joining part (2) has at least one first deformation element arranged on the first joining surface and / or the second sintered joining part has at least one second deformation element arranged on the second joining surface and deformation of at least one of the deformation elements is brought about by pressing against one another.

Part set with sintered joining parts for joining the sintered joining parts to a sintered part (1) with highly accurate radial precision, the parts set comprising:

at least one first sintered joining part (2),

at least one second sintered joining part (3),

- At least one radial deformation element.

Set of parts according to claim 10, characterized in that the set of parts has an outer deformation part (5), which in the context of joining

- At least the first Sinterfügeteil (2) at least partially encircling and / or

- At least the second Sinterfügeteil (3) at least partially encircling

is positionable and forms a radial deformation element, which is designed as an outer radial deformation element.

Parts kit according to claim 11, characterized in that

the first sintered joining part (2) has a first radial retaining projection (13) and / or

- The second sintered joining part (3) has a second radial retaining projection (14)

for axial positioning of the outer deformation part (5) in the joined state of the sintered part (1).

Parts set according to one of claims 10 to 12, characterized in that the set of parts has an inner deformation part (4), which in the context of joining - at least a first inner surface (8) of the first Sinterfügeteils (2) at least partially covering and / or - At least a second Innenfügef pool (9) of the second Sinterfügeteils (3) at least partially covering

can be positioned and forms a radial deformation element, which is designed as an inner radial deformation element.

Parts set according to one of claims 10 to 13, characterized in that

at least one region of at least one inner surface (8, 9) of the first sintered joining part (2),

at least one region of at least one inner surface (8, 9) of the second sintered joining part (3),

at least one region of at least one outer joining surface (10, 11) of the first sintered joining part (2), and / or

has at least one radial Abhebung (6), which is designed as an inner radial deformation element.

Parts set according to claim 14, characterized in that the radial projection (6) with one of the geometric shapes spherical section, spherical segment stump, truncated cone, cuboid, trapezoidal stump, truncated pyramid or Linienerhabung, preferably in an axial direction of the first sintered joining part (2) parallel direction and / or in a direction parallel to an axial direction of the second sintered joining part (3). 16 parts set according to claim 14 or claim 15, characterized in that the radial projection (6)

an extension of an upper contact surface of 0.2 mm in at least one dimension of the contact surface,

- Has a height of 0.1 mm to 2.0 mm between the base and the contact surface.

Parts set according to one of claims 10 to 16, characterized in that the sintered part (1) with highly accurate radial precision, a rotor for a camshaft stage, an oil pump housing, a stator or a shock absorber piston.

Use of a parts set according to one of Claims 10 to 17 for joining to a sintered part which can be removed from a calibration tool as a sintered part (1) with highly accurate radial precision, preferably using a method according to one of Claims 1 to 9.