WO2019015942A1

WO2019015942A1 - Device and method for joining a workpiece, and such a workpiece

Info

Publication number: WO2019015942A1
Application number: PCT/EP2018/067737
Authority: WO
Inventors: Klemens Uebele; Manfred KAPLAN; Elmar Locher
Original assignee: Tox Pressotechnik Gmbh & Co. Kg
Priority date: 2017-07-21
Filing date: 2018-07-02
Publication date: 2019-01-24
Also published as: DE102017116560A1

Abstract

The invention relates to a device for joining a workpiece (6), comprising a punch unit (1) and a die unit (7), wherein the punch unit (1) and the die unit (7) lie opposite one another and are movable relative to one another. The workpiece (6) can be positioned between the die unit (7) and the punch unit (1), the punch unit (1) having a punch pin (2), the punch pin (2) being provided in the joining process for engagement at a joining point (12) of the workpiece (6). The device is characterised in that a maximum penetration depth of a punch unit (1) into the workpiece (6) for producing a joint (13) at the joining point (12) of the workpiece (6) is smaller than a material thickness of the workpiece (6) at the joining point (12) before the joining process. In the arranged state of the workpiece (6) on the device, the material thickness of the workpiece (6) at the joining point (12) can be seen in the joining direction (F).

Description

DEVICE AND METHOD FOR MOUNTING A WORKPIECE, AND SUCH A WORKPIECE

State of the art

Joining tools must be regularly complex or

meet different requirements. For precisely defined working processes during joining, modern tools must be designed accordingly, whereby short cycle times with high process reliability are desired.

Purpose and advantages of the invention

Object of the present invention is a device for joining workpieces of the type mentioned

to provide which can be used reliably.

This object is solved by the independent claims. The dependent claims relate to advantageous and

expedient developments of the invention.

The invention is based on a device for joining a workpiece, comprising a stamp unit and a

Die unit, wherein the stamp unit and the

Matrizeneinheit face each other and relative to each other are movable, the workpiece between the

Matriceseinheit and the punch unit is positionable, wherein the punch unit has a punch pin, wherein the punch pin in the joining operation for engagement on a

Joint of the workpiece is provided.

Advantageously, the device for joining a

Bowl of a vehicle wheel provided on a rim of the vehicle wheel, e.g. for joining a bowl to a rim of a steel wheel, e.g. in the form of a vehicle wheel joining device or as a steel rim joining device. The device is designed, for example, as a tool tongs, in particular as a joining and / or embossing tongs. The device is designed in particular for metalworking.

The die unit is preferably provided fixed in position on the device, for example on a bracket of

Device. For machining the workpiece, the workpiece is usually facing one of the stamp unit

Top of the matrix unit launched. In this case, the device is in a basic position or in a

open position, so that the die unit well

is accessible or is not concentrated in space. The

Stamp unit is advantageously moved away in the basic position of the die unit, whereby an intermediate space between the punch unit and the die unit increases

is provided, which facilitates the positioning of the workpiece on or on the die unit. This is advantageous regardless of whether the device is fixed and the workpiece is brought before the processing to the die unit or the device, for example, on a predeterminably driven in space movable robot arm

is received, so the device e.g. is moved robotically to the workpiece so that the workpiece, e.g. supported at the top of the Matrizeneinheit.

The essence of the invention is to be seen in that

Device is designed such that a maximum Penetration depth of a stamp unit in the workpiece for

Completion of a joint at the joint of the workpiece is smaller than a material thickness of the workpiece at the joint before the joining process and wherein in

arranged state of the workpiece on the device, the material thickness of the workpiece at the joint in the joining direction can be seen. This is a weight and / or a

Workpiece thickness of the workpiece to be machined minimized. In the following, the material thickness of the workpiece is also called

Workpiece thickness called.

Advantageously, the workpiece comprises several

Workpiece parts, in particular exactly two workpiece parts, which by means of the proposed device for joining

in particular are permanently connected to one another.

Preferably, the workpiece is in two parts consisting of a first workpiece part, e.g. consisting of a first material and a second workpiece part

consisting of the same first material or a

another, second material. A workpiece thickness of the workpiece is advantageously greater than or equal to 4mm. For example, a thickness, in particular a total thickness of the two, in particular superimposed, first and second workpiece parts is greater than or equal to 4.5 mm. The

Workpiece thickness can be seen in particular in the joining direction. A workpiece thickness of the first workpiece part is advantageously different from a workpiece thickness of the second workpiece part. In particular, the workpiece thicknesses of the first workpiece part and the second workpiece part are the same.

Advantageously, the ratio of a maximum

Penetration depth to the workpiece thickness of the workpiece, in particular to the total material thickness of the workpiece is less than or equal to 0.9, in particular, the ratio is 0.6. Preferably, a maximum penetration depth of the punch unit for producing the joint connection in a range between 40% and 80% of Workpiece thickness at the joint. Whereby the penetration depth can be seen in joining direction. For example, the

Penetration depth of the stamp unit for the production of

Joining connection 50% or 70% of the total workpiece thickness at the joint before the joining process, in particular 60% of

Workpiece thickness at the joint before the joining process. The penetration depth is advantageously based on a

To see top of the workpiece at the joint before joining in the joining direction.

Advantageously, the joint connection according to

Completion in a way that no

additional different joining connection on the workpiece

necessary to be connected by the joining connection

To keep workpiece parts of the workpiece in a functional connection. Optionally, a finished workpiece comprises several, in particular the same

joining compounds according to the invention. It is further proposed that the punch pin a

Fitting surface has, wherein the joining surface to the die unit facing the punch pin is present, and the punch pin has an outer contour, which is starting from the joining surface in a direction away from the die unit is present in a tapered. As a result, a stripping force is reduced, whereby a comparatively higher device or

Stamp life is realized. For example, by the proposed device a comparatively increased

Service life of the device realized.

Advantageously, the punch pin is present cylindrically symmetrical. For example, the outer contour of the

Stamped pin conical or cone-shaped.

In particular, the outer contour of the punch pin is conically tapered in a direction away from the die unit, opposite to the joining direction. Starting from the joining surface of the stamping pin in the direction opposite to the joining movement, for example, a reduced Outer diameter of the spigot. The outer diameter of the stamping pin, in particular a maximum outer diameter of the stamping pin, for example in the joining region of

Stamping pin, is in a range between 5mm and 8mm, e.g. between 6mm and 7mm. The outside diameter of the

Stamping pin, in particular a maximum outer diameter of the punch pin, for example in the joining region of the

Stamping pin, is 6.5mm, 6.6mm, 6.7mm, 6.9mm, 7mm, 7.1mm, 7.2mm, especially exactly 6.8mm.

Moreover, it is advantageous that the joining surface of the

Stamping pin is convex. The joining surface preferably has a circular or oval outline. In particular, the circular or oval joining surface in the direction of a center of the joining surface is tapered raised, for example, in the direction of the die unit. It is also conceivable that the joining surface is flat or flat or concave. It also proves to be advantageous that a transition between the contour of the joining surface to the outer contour of the stamping pin is rounded. For example, the transition is annular or circular. The transition advantageously forms an outer edge, in particular a

rounded outer edge of the stamping pin.

It is also advantageous that the punch pin, in particular the joining surface of the punch pin, in the joining movement does not reach an upper side of the die unit, wherein the

Top of the matrix unit a support surface for the

Workpiece forms. Preferably, a support plane of the die unit for the workpiece in the joining movement is not reached or penetrated by the stamp unit.

For example, the support plane forms the bearing surface of the workpiece. For example, the top of the forms

Matrizeneinheit the bearing surface of the workpiece, in particular before the joining process. In particular, the bearing surface of the die unit for the workpiece is fixed or fixed in position. Advantageously, the support surface is in an area around the joint on the

Matrix unit available. For example, the die unit is formed recessed at the joint to the support surface. Advantageously, the die unit has a recess in an area of the joint. The recess comprises a diameter which is larger, for example, than the outline of the

Joining surface of the stamping pin. In particular, the

Diameter of the recess larger than an outer diameter of the punch pin in the joining area of the punch pin. The

Diameter of the recess, in particular a maximum

Diameter of the recess, for example, lies in a range between 5mm and 15mm, e.g. between 7mm and 12mm, e.g. between 8mm and 10mm. The diameter of the recess is for example 8mm, 8.5mm, 9mm, 10mm, 10.5mm, lim,

especially exactly 9.5mm. Advantageously, the surface of the die unit, in particular the bearing surface of the workpiece on the

Matrizeneinheit, domed present, in particular convex. For example, the surface of the

Matrix unit has a partial radius of e.g. 300mm, in particular a partial spherical surface or a partial ellipsoidal surface having a radius of e.g. 300mm. The partial radius is advantageously in a range between 200mm and 500mm, e.g. between 250mm and 400mm, e.g. between 270mm and 350mm. It is also conceivable that the surface of the matrix unit is flat or flat or concave.

An advantageous variant of the invention is a method with a device as described above, wherein the punch unit is driven by a drive unit of the device, and the punch unit with the joining surface of the punch pin to complete the joint connection less than the material thickness of the workpiece at the joint in the Workpiece is moved and the material thickness of the Workpiece at the joint in the arranged state of the

Workpiece on the device before the joining process in

Joining direction can be seen. It is further proposed that the method be such

is formed so that the joining surface of the punch pin is moved in a joining movement in a maximum deflected position in the direction of the die unit, wherein the joining surface to the support surface of the die unit in the maximum deflected position seen in the direction of movement a distance from

Having bearing surface.

In addition, a workpiece with a joint connection

proposed, wherein the joint connection, e.g. is made with a device as described above, wherein the joint of the joint of the workpiece a maximum penetration depth of a completed joint connection of the

Workpiece has, which is smaller than a wall thickness of the workpiece in the region around the joint in front of the

Joining process and / or a wall thickness at the joint.

The material thickness of the workpiece, e.g. a wall thickness of the workpiece and / or a workpiece thickness, in particular a total wall thickness of the workpiece at the joint and / or in an area around the joint before the joining operation is in a range between 4.5 mm and 10 mm, e.g. in a range between 5.5 mm and 8 mm, for example in a range between 5.6 mm and 6.5 mm, in particular in a range between 5.6 mm and 6.0 mm. If the workpiece comprises two or more workpiece parts, then the workpiece parts in the region of the joint are in particular tight or direct, for example, before the joining operation. positive fit, abutting each other.

Advantageously, the workpiece, in particular the first and / or the second workpiece part of the workpiece, at the joint, in particular in a region around the joint, has a tensile strength of at least 450N / mm 2, e.g. from

at least 500N / mm 2, in particular of at least 520N / mm 2. For example, the first and / or the second workpiece part made of metal, in particular made of steel.

Moreover, it is advantageous that the finished asked

Joint connection of the workpiece after joining one

having cylindrical-shaped cap. Preferably, a depth of the joint or of the clinch point is smaller than a total thickness or a material thickness of the workpiece at the joint before the joining process.

An advantageous modification of the invention is a component with a workpiece which precedes with a

described device and / or a preceding

described method and / or which comprises a previously described workpiece. The component is e.g. as a vehicle wheel, e.g. as a car wheel or a

Truck wheel, for example as a rim of a vehicle wheel, e.g. as a vehicle rim, e.g. an automobile or a truck rim, in particular as a steel rim of a vehicle wheel.

Description of an embodiment

In the following, an embodiment will be explained in more detail with reference to schematic drawings, indicating further details and advantages.

FIG. 1 shows a lateral sectional view of a detail of a punch unit according to the invention with a punch pin and Figure 2 is a side sectional view of a section of a die unit and a workpiece according to the invention with a joint connection, which has been joined by means of a punch unit according to Figure 1.

FIG. 1 shows a punch unit 1 with a punch pin 2. The punch pin 2 comprises a joining face 3, a

Outer contour 4 and one of the joining surface 3 to the outer contour 4 rounded transition 5. The punch pin 2 is

for example, about a rotational axis A cylindrically symmetric. The outer contour 4 is advantageously conical or tapering away from the joint surface 3 itself

rejuvenating available. The joining surface 3 is, for example, convex. In a joining movement is the

Stamp unit 1 moves together with the punch pin 2 in a joining direction F. The joining direction F is

advantageously parallel to the axis of rotation A of

Stamping pin 2 available. Figure 2 shows a sectional view through a finished joined

Workpiece 6 and a die unit 7. The workpiece 6 is shown in Figure 2 resting on the die unit 7.

The workpiece 6 comprises a first workpiece part 8 and a second workpiece part 9. The first workpiece part 8 advantageously comes to the die unit 7 for a

Joining process to rest on a top 10. The second workpiece part 9 is advantageously in the joining process in direct contact, e.g. in contact, with the punch pin 2. The first workpiece part 8 includes, for example, a

smaller material thickness Dl than a material thickness D2 of the second workpiece part 9. The workpiece 6 has a

Total material thickness D, which, for example, from the materials Dl of the first workpiece part 8 and the

Material thickness D2 of the second workpiece part 9 composed.

In the joining operation in the joining direction F, the stamp unit 1 comes first with the joining surface 3 of the stamp pin 2 with a Outside 11 of the workpiece 6 in contact and presses at a joint 12 of the workpiece 6, the outer side 11 of the workpiece 6 in the joining direction F in the direction of the die top 10. In the joining process, the punch pin 2 penetrates via a

Joining distance in the joining direction F in the workpiece 6 and displaces or compresses the material of the workpiece 6, so that the two workpiece parts 8, 9 are joined together. The joining distance of the punch 2 in the workpiece 6, or a maximum penetration depth of the punch 2 in the workpiece 6 at the joint, for example, corresponds to a depth of a completed joint connection 13, or one finished

Asked Filler. The depth of the finished

Joining connection 13 is in the joining direction F, starting from the outer side 11 of the workpiece 6 at the joint 12

in particular, starting from a position of the outer side 11 before the joining process, to a bottom 15 of the joint 13 to measure. Advantageously, the depth of a completed joint connection 13 corresponds at least to the thickness D2 of the second workpiece part 9. In particular, the depth of a completed joint connection 13 is greater than the thickness D2 of the second workpiece part 9.

The die unit 7 has at the joint 12 a

Recess 14, in which the material of the workpiece 6 is urged in the joining process. The recess 14 has

Advantageously, an outer diameter AI, which is greater than an outer diameter A2 of the outer contour 4 of the

Stamping pin 2. Advantageously, the outer diameter AI of the recess 14 is greater than an inner diameter I of the completed joint connection 13. Preferably, the inner diameter I of the completed joint connection 13 is greater than or equal to the outer diameter A2 of the outer contour 4 of the punch pin. 2 LIST OF REFERENCE NUMBERS

1 stamp unit

2 punch pins

3 joining surface

4 outer contour

5 transition

6 workpiece

7 matrix unit

8 workpiece part

9 workpiece part

10 top

11 outside

12 joints

13 joint connection

14 deepening

15 floor

Claims

Device for joining a workpiece (6), comprising a stamp unit (1) and a die unit (7), wherein the stamp unit (1) and the die unit (7) are located

are opposite and movable relative to each other, wherein the workpiece (6) between the die unit (7) and the punch unit (1) is positionable, wherein the

Stamp unit (1) has a punch pin (2), wherein the punch pin (2) is provided in the joining operation for engagement on a joint (12) of the workpiece (6),

characterized in that

the device is designed such that a maximum penetration depth of a punch unit (1) into the workpiece (6) for the completion of a joint connection (13) on the

Joint (12) of the workpiece (6) is smaller than a material thickness of the workpiece (6) at the joint (12) before the joining operation and wherein in the arranged state of the

Workpiece (6) on the device, the material thickness of the workpiece (6) at the joint (12) in the joining direction F can be seen.

Device for joining a workpiece (6) after the

previous claim 1, characterized in that the punch pin (2) has a joining surface (3), wherein the joining surface (3) to the die unit (7) facing on

Stamping pin (2) is present, and the punch pin

(2) has an outer contour (4), which starting from the joining surface (3) in a direction away from the die unit (7) is present in a tapered manner.

Device for joining a workpiece (6) according to one of the preceding claims, characterized in that the joining surface

(3) of the punch pin (2) is convex.

4. A device for joining a workpiece (6) according to one of the preceding claims, characterized in that a Transition (5) between an outline of the joining surface (3) to the outer contour (4) of the punch pin (2) rounded

is trained.

Device for joining a workpiece (6) according to one of the preceding claims, characterized in that the punch pin (2), in particular the joining surface (3) of the

Stamping pin (2), in the joining movement does not reach an upper side (10) of the die unit (7), wherein the upper side (10) of the die unit (7) forms a bearing surface for the workpiece (6).

A method for producing a joint connection (13) with a device according to claim 1, characterized in that the stamp unit (1) is driven by a drive unit of the device, and the stamp unit (1) with the joining surface (3) of the stamp pin (2) for Completion of the joint (13) less than the material thickness of the workpiece (6) at the joint (12) in the workpiece (6) is moved and wherein the material thickness of the workpiece (6) at the joint (12) in the arranged state of the

Workpiece (6) on the device before the joining process in the joining direction F can be seen.

A method for producing a joint connection (13) with a device according to claim 1, in particular according to a method according to the preceding claim 6, characterized in that the joining surface (3) of the punch pin (2) in a joining movement in a maximum deflected

Position in the direction of the die unit (7) is moved, wherein the joining surface (3) to the support surface (10) of

Matrizeneinheit (7) in the maximum deflected position seen in the direction of movement has a distance from the support surface (10).

Workpiece (6) with a joint (13), which is produced by a device or a method according to one of the preceding claims, characterized in that a joint (12) of a finished joining connection (13) of the workpiece (6) has a maximum penetration depth, which is smaller than a wall thickness of the workpiece (6) in the region around the

Joint (12) before the joining process and / or a

Wall thickness at the joint (12) before the joining process.

Workpiece (6) with a joint connection (13) after the

The preceding claim 8, characterized in that the finished Asked joint (13) after joining has a cylindrical cap.

Component with a workpiece (6), in particular with a workpiece (6) according to one of claims 8 or 9, which comprises a device according to one of claims 1 to 5 and / or a method according to one of claims 6 or 7

is made.