DE202010005349U1 - Double punching bushing and system consisting of a tube and a double punching bush - Google Patents

Abstract

A double punch bushing (10) for forming a duct through a pipe, the duct being substantially perpendicular to the pipe axis, the double punch bushing (10) having a substantially cylindrical hollow body (15) with two punched sections (FIG. 2) arranged at opposite axial ends of the hollow body (15). 20, 20 ') for punching through two opposite walls of the tube, the punched sections (20, 20') each having an opening (30, 30 '), and a central section (22) arranged between the two punching sections (20, 20'). 20 ') is arranged and bearing surfaces (40, 40') for abutment on the tube inside, wherein
- The two punched sections (20, 20 ') and the central portion (22) each have a cylindrical outer periphery, and
- The central portion (22) has a larger outer diameter than the punched portions (20, 20 '), so that adjacent to the punched portions (20, 20'), the abutment surfaces (40, 40 ') are formed.

Description

The The invention relates to a double punch bushing and a system of one Pipe and a double punching bush.

at Tubes, in particular square, oval or hydroformed tubes, used in the automotive industry For example, as door bracing for reinforcement a door or front ends are used often a perpendicular to the tube extending channel formed by the tube be, for example, to attach the pipe. To form a of such a channel through a pipe, bushings are used, which are in the pipe are arranged and through which the channel passes. at hitherto known sockets must be opposite Parts of the pipe wall are removed and the bushing in the pipe at this Be used. To arrange the bushing mounting holes needed on the pipe wall or in the pipe.

adversely is at the prior art sockets that to form a channel through the pipe receiving bores are necessary and forming receiving bores is costly and time consuming. Another disadvantage is that at prior art sockets considerable tolerance variations the position of the channel occur.

Of the Invention has for its object to provide a socket, the forming a channel in a technically simple way and inexpensive.

These Task is a double punch bushing according to claim 1 solved. The task is also characterized by a system a pipe and a double punch bush according to claim 14 solved.

Especially The task is accomplished by a double punch bushing to form a channel solved by a pipe, wherein the channel is substantially perpendicular runs to the tube axis, the double punch bushing a essentially cylindrical hollow body with two at opposite axial ends of the hollow body arranged punching sections for punching through two opposite Walls of the tube, wherein the punched sections each have an opening have, and with a central section, between the two Punching sections is arranged and bearing surfaces to the plant has on the pipe inside, wherein the two punched sections and the central portion each have a cylindrical shape Have outer circumference, and the central portion a larger outer diameter than the punched sections has, so that adjacent to the punching sections, the contact surfaces are formed.

By the double punch bushing according to the invention can without Production of locating holes a channel formed by a pipe be transverse, in particular perpendicular to the tube axis. By compressing the tube, the punched sections punch through the pipe wall, whereby a channel is formed through the pipe. Through the central section is the double punched bush in the axial direction of the channel mounted in the pipe. Advantageous to this is that the technical effort is reduced and time is saved, since no production of mounting holes is needed. In addition, thereby the channel with a high position accuracy be formed.

Of the Hollow body can be a polygonal outer surface exhibit. The advantage of this is that this is easier to handle the double punching bush, in particular by machines, allows.

In In one embodiment, the hollow body is segmented. The segmentation is a technically easier production of the hollow body allows.

In In a preferred embodiment, the stamped sections one, in particular paraxial, helical teeth or left-right, knurled on, that on the outer circumference of the respective punching section is arranged and in use each is in engagement with the material of the tube and the double punch bushing connects to the pipe without twisting. One Advantage of this is that by the knurling on technical simple way is ensured that the double punching bush can be arranged against rotation in the pipe.

Of the central section can be a longer length in the axial direction of the hollow body than the punched sections. This will change the ratio between total length the double punch bushing and the diameter of the pipe in which the Channel is formed, significantly reduced.

at an embodiment, the two punching sections in the axial direction of the hollow body substantially the same length up.

The Both punching sections may be substantially the same size. This ensures that the openings in the two opposite pipe walls are symmetrical.

alternative the punched sections can be different in size. This will cause that the openings in the two opposite pipe walls are asymmetrical.

In a further embodiment, the openings are via a common Durchgangsboh connected, wherein more preferably, the openings and the through hole are aligned and have a common inner diameter. One advantage of this is that the channel formed has flat walls, which greatly facilitates the passage of pins, in particular grub screws, for fastening the pipe, etc.

In the through hole can at least partially, in particular continuous, an internal thread be formed. Advantageous this is because the double punch bushing is through with the through hole connectable screws can be easily attached technically.

In Another embodiment, the knurls sharp-edged grooves on each. This will punch through the pipe walls considerably facilitated by the sharp Edges greater voltages or larger local force differences on the tube walls during punching be exercised.

The Material of the double punched bush can be a metal and / or a metal alloy, in particular steel. An advantage of this is that through such a double punch bushing also punched through pipe walls could be made of harder materials.

The Punching sections can be used to punch through pipe walls be formed during high-pressure forming of pipes. This will ensured that the double punch bushing also in the high-pressure forming high pressures do not change their shape.

Especially The object of the invention is also achieved by a system of a tube and a stamped in the pipe double punch bushing with one or solved several of the features described above. Such System has a technically simple and inexpensive formed channel through the pipe.

The Double punch bushing is in itself, d. H. revealed without a pipe and claimed. Furthermore, the double punch bushing is punched in one Pipe disclosed and claimed. This applies to all inventive Embodiments or embodiments.

preferred Embodiments emerge from the subclaims. The invention will be described with reference to a drawing of an embodiment explained in more detail.

in this connection shows

1 a side view and a cross-sectional view of a double punch bushing according to the invention.

The left half of the 1 shows a side view and the right half of 1 shows a cross-sectional view of a double punch bushing according to the invention 10 , The double punch bush 10 comprises a substantially cylindrical hollow body 15 , It is conceivable that the outer surface of the hollow body 15 is polygonal. It is also conceivable that the hollow body 15 is segmented. The hollow body 15 has a bottom punching section 20 and an upper punch section 20 ' on, at the two opposite axial ends of the hollow body 15 are arranged. The punched sections 20 . 20 ' are designed to punch through the pipe walls.

Between the punched sections 20 . 20 ' is a central section 22 arranged. The central section 22 includes at its upper and lower end each bearing surfaces 40 . 40 ' , which lie in use on the inside of the tube. The contact surfaces 40 . 40 ' are located at the transition between the central section 22 and the punching sections 20 . 20 ' and run parallel to each other. The contact surfaces 40 . 40 ' can have an undercut. The central section 22 , in particular the contact surface 40 . 40 ' , can also be used to seal the pipe in use. The central section 22 closes in use. The seal through the central section 22 may be dense especially to liquids or even to gases tight.

The punched sections 20 . 20 ' and the central section 22 each have a cylindrical outer periphery. The outer circumference of the central section 22 has a larger outer diameter than the punched sections 20 . 20 ' , The outer diameter of the punched sections 20 . 20 ' is preferably the same size. However, it is also conceivable that the punched sections 20 . 20 ' have different outer diameter. The lengths or heights of the punched sections 20 . 20 ' in the axial direction of the hollow body 15 are preferably the same size. It is also conceivable that the punched sections 20 . 20 ' different lengths or heights in the axial direction of the hollow body 15 exhibit. The outer diameter of the punched sections 20 . 20 ' For example, with a specific design, it can be 16 mm ± 0.1 mm (tolerance). The outer diameter of the central section 22 may preferably be 19 mm in this design. The hollow body 15 encloses a through hole 35 which forms the channel through the pipe in use.

The central section 22 has in the illustrated here, specific design a greater length in the axial direction of the hollow body 15 on as the punched sections 20 . 20 ' , The length of the central section 10 in the axial direction of the hollow body 15 in the present example case is 10 mm ± 0.1 mm (tolerance). The length of the punched sections 20 . 20 ' in the axial direction of the hollow body 15 in the present case is in each case 1.1 mm + 0.1 mm (tolerance). The hollow body thus preferably has an overall length in the axial direction of the hollow body in the illustrated example case 15 of 12.2 mm. The two punched sections 20 . 20 ' have in the axial direction of the hollow body 15 essentially the same length. However, they can also be different lengths. The two punched sections 20 . 20 ' are preferably substantially the same size.

The punched sections 20 . 20 ' each have an opening 30 . 30 ' on. Preferably, the openings 30 . 30 ' same size. The axes of the openings 30 . 30 ' show in use perpendicular to the tube axis. The inner diameter of the punched sections 20 . 20 ' and the inner diameter of the central portion 22 are the same size. It is also conceivable that the inner diameter of the punched sections 20 . 20 ' and the central section 22 are different in size. For example, the punched sections 20 . 20 ' and the central section 22 have a so-called hat profile in cross-section.

Through the double punched bush 10 runs through hole 35 , in the 1 runs from top to bottom. The openings 30 . 30 ' and the through hole 35 aligned. The through hole 35 has a diameter of 14 mm ± 0.1 mm (tolerance) in the example case illustrated here. At the outer axial ends of the through hole 35 is the inner surface of the hollow body 15 or the surface of the through hole 35 at an angle of 45 ° to the axial direction of the through hole 35 in the radial direction of the through hole 35 Beveled (so-called bevel 55 ). The extreme axial end of the through hole 35 In the present case, this results in an inner diameter of 14.2 mm + 0.3 mm (tolerance).

The through hole 35 has at least partially on an internal thread. It is also conceivable that the through hole 35 a continuous, ie over the entire length of the through hole 35 extending, having internal thread. As a result, for example by means of a screw, the double punched bushing 10 and thus the tube in which the double punch bushing is stamped, attached or connected to another component.

The punched sections 20 . 20 ' each comprise an axis-parallel knurl 25 . 25 ' on the outer circumference of the respective punching section 20 . 20 ' is arranged. Alternatively, the knurl 25 . 25 ' a helical knurl or a left-right knurl. It is also conceivable that the punched sections 20 . 20 ' have a so-called Clifa-M contour. The knurls 25 . 25 ' are in use each with the material of the pipe in engagement. Through the knurls 25 . 25 ' becomes the double punching bush 10 non-rotatably connected to the pipe. The knurls 25 . 25 ' each have axially parallel sharp-edged grooves 27 on. The scores 27 run parallel to the axis of the through hole 35 ,

When punching the punched sections 20 . 20 ' pass through the pipe wall due to the sharp edges of the grooves 27 high local stresses or high force differences, whereby the pipe wall is punched easier. The scores 27 preferably have a pitch of 0.5 mm. The knurls 25 . 25 ' are preferably each knurls with RAA 0.5 DIN 82 ,

The material of the double punched bush 10 is a metal and / or a metal alloy, in particular steel. Preferably, the material consists of the steel 11 SMnPb 30 + C (material number 1.0718). The double punch bush 10 can in particular from semi-finished EN 10278h11 be made.

To picture a channel through a pipe is the double punching bushing 10 introduced into the tube at the point where the channel is to be formed by the tube, perpendicular to the tube axis. The axis of the through hole 35 the double punching bush 10 shows perpendicular to the tube axis. Then the pipe or the pipe walls, for example by high-pressure forming and / or hydroforming, compressed. This can be over the entire length of the pipe or only in the area of the double punched bushing 10 happen. As a result, the punched sections punch 20 . 20 ' in or through opposite pipe walls to the pipe inner walls on the contact surfaces 40 . 40 ' to come to rest. The so-called punched slug of the pipe walls resulting from the punching is then removed, for example by one or more shearing knives. As a result, a channel is formed technically simple and inexpensive perpendicular to the tube axis and the double punch bushing 10 is arranged or fixed in the pipe with high accuracy. This results in a high position accuracy for the formed channel.

In particular, the double punch bushing according to the invention is suitable 10 for forming channels through pipes of front ends, door braces and / or hydroforming (IHU) pipes.

The free dimension tolerances of the different areas of the double punch bushing 10 are after the Standard ISO-2768-m certainly.

At It should be noted that all of the above Parts seen on their own and in any combination, in particular the details shown in the drawing, as essential to the invention be claimed. Variations thereof are those skilled in the art common.

10

Double dance socket

15

cylindrical hollow body

20 20 '

piercing section

22

central section

25 25 '

knurled

27

cried

30 30 '

opening

35

Through Hole

40 40 '

contact surfaces

55

chamfer

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• - DIN 82 [0033]
• - EN 10278h11 [0034]
• - Standard ISO-2768-m [0037]

Claims (14)

Double punch bushing ( 10 ) for forming a channel through a pipe, wherein the channel is substantially perpendicular to the tube axis, wherein the double punch bushing ( 10 ) a substantially cylindrical hollow body ( 15 ) with two at opposite axial ends of the hollow body ( 15 ) arranged punching sections ( 20 . 20 ' ) for punching through two opposite walls of the tube, wherein the punched sections ( 20 . 20 ' ) one opening each ( 30 . 30 ' ), and with a central portion ( 22 ), which between the two punching sections ( 20 . 20 ' ) and contact surfaces ( 40 . 40 ' ) to rest against the pipe inside, wherein - the two punched sections ( 20 . 20 ' ) and the central section ( 22 ) each have a cylindrical outer periphery, and - the central portion ( 22 ) has a larger outer diameter than the punched sections ( 20 . 20 ' ), so that adjacent to the punching sections ( 20 . 20 ' ) the contact surfaces ( 40 . 40 ' ) are formed. Double punch bushing ( 10 ) according to claim 1, wherein the hollow body ( 15 ) has a polygonal outer surface. Double punch bushing ( 10 ) according to claim 1 or 2, wherein the hollow body ( 15 ) is segmented. Double punch bushing ( 10 ) according to one of the preceding claims, wherein the punched sections ( 20 . 20 ' ) one, in particular paraxial, helical or left-right, knurl ( 25 . 25 ' ), which on the outer periphery of the respective punching section ( 20 . 20 ' ) is arranged and in use is in each case with the material of the tube in engagement and the double punch bushing ( 10 ) torsionally connected to the pipe. Double punch bushing ( 10 ) according to any one of the preceding claims, wherein the central portion ( 22 ) a greater length in the axial direction of the hollow body ( 15 ) than the punched sections ( 20 . 20 ' ). Double punch bushing ( 10 ) according to one of the preceding claims, wherein the two punched sections ( 20 . 20 ' ) in the axial direction of the hollow body ( 15 ) have substantially the same length. Double punch bushing ( 10 ) according to one of the preceding claims, wherein the two punched sections ( 20 . 20 ' ) are substantially the same size. Double punch bushing ( 10 ) according to any one of claims 1-6, wherein the two punched sections ( 20 . 20 ' ) are different in size. Double punch bushing ( 10 ) according to one of the preceding claims, wherein the openings ( 30 . 30 ' ) via a common through-bore ( 35 ), more preferably the openings ( 30 . 30 ' ) and the through-hole ( 35 ) are aligned and have a common inner diameter. Double punch bushing ( 10 ) according to one of the preceding claims, wherein in the through-bore ( 35 ) At least in sections, in particular continuously, an internal thread is formed. Double punch bushing ( 10 ) according to one of the preceding claims, wherein the knurls ( 25 . 25 ' ) each sharp-edged grooves ( 27 ) exhibit. Double punch bushing ( 10 ) according to one of the preceding claims, wherein the material of the double punched bushing ( 10 ) comprises a metal and / or a metal alloy, in particular steel. Double punch bushing ( 10 ) according to one of the preceding claims, wherein the punched sections ( 20 . 20 ' ) are formed for punching through pipe walls during high-pressure forming of pipes. System consisting of a tube and a double punched bushing punched in the tube ( 10 ) according to any one of the preceding claims.