DE102008002657A1 - Method for the production of double shell having internal and external shell, and/or cylinders of boost dryer unit, comprises connecting the internal and the external shells with one another over a sleeve-like bolt - Google Patents

Abstract

The method comprises connecting internal and the external shells (10, 12) with one another over a sleeve-like bolt (16), which is contacted with the internal shell and also with the external shell. The bolt and the shells are pressed against each other in the area of contact zone (18) and the bolt is transferred in rotation in order to bring the both contact zones through the emerging frictional heat of the bolt and the shells. A welding connection (22) reforms between the bolt and the shells. The bolt is pressed against the shells. The method comprises connecting internal and the external shells (10, 12) with one another over a sleeve-like bolt (16), which is contacted with the internal shell and also with the external shell. The bolt and the shells are pressed against each other in the area of contact zone (18) and the bolt is transferred in rotation in order to bring the both contact zones through the emerging frictional heat of the bolt and the shells. A welding connection (22) reforms between the bolt and the shells. The bolt is pressed against the shells in order to weld with a rotation of the bolt simultaneously with the shells. The rotation of the bolt is adjusted after melting the bolts and the shells and the bolts and the shells are pressed against each other up to the welding connection is cooled at a predetermined temperature. The pressure for pressing together is selected so that it is same or higher than the contact pressure during the previous welding process. One of the both shells is equipped with an opening and the bolt is guided with the end through the opening and is pressed with the end against the other shell in order to produce the relevant friction contact. The bolt is subjected with the shell having the opening over a seat and the friction contact is produced between the bolt and the shell over the seat. The friction contact is produced between the bolt and the shell having the opening over the straight or conical seat. A protrusion of the bolt appeared in the area of the opening is taken out after the welding process. The radial interval between the shells is held during the welding process through support elements subjected between the shells. The shells is supported the shells are supported during the welding process partially through magnetic and/or pneumatic holding power. The bolt is subjected with its both front sides with the shells and the bolt is welded on its both front sides with the shells over a coaxial slider subjected through a shell opening. The bolt parts are welded with the shells and are welded during or after the connection between the bolt and the shell.

Description

The The invention relates to a method for producing an interior and an outer shell comprising a double shell of a cylinder, in particular a cylinder of a BoostDryer unit.

A so-called BoostDryer unit can be used, for example, for drying a running fibrous web, which may in particular be a paper, board or tissue web. In this case, the fibrous web, together with an outer impermeable press belt and at least one arranged between this and the fibrous web porous, the absorption of moisture serving string performed around a heated rotating cylinder and the heated cylinder together with the porous fabric and the fibrous web looping outer press belt means acted upon at least one pressure hood. Such drying arrangements or BoostDryer units are for example from the documents EP-A-1 780 331 . WO-A-2006/072505 . WO 2005/100682 and DE-A-10 2004 017 810 known.

By the pressure of the hood but the drying cylinder is now heavily used, so he must have a corresponding rigidity. Will the Drying cylinder heated from the inside with steam, so must for an efficient transfer of heat to the cylinder surface the cylinder wall as thin as possible become. The drying cylinder of a BoostDryer unit must therefore be large Withstand loads caused by the applied dome pressure, at the same time for low-loss heat transfer from the inside the cylinder surface as thin as possible Cylinder wall is required. To meet these requirements For example, a two-shell cylinder construction provided be in which a thin outer shell with low Thermal resistance with a thick support tube high flexural rigidity is connected.

Of the Invention is based on the object, as efficient as possible Method for producing such an inner and an outer shell comprehensive double shell of a cylinder, in particular a cylinder with BoostDryer unit, specify.

According to the invention this object is achieved by a method for the production one comprising an inner and an outer shell double shell of a Cylinder, in particular a cylinder of a BoostDryer unit, wherein the inner and the outer shell over at least a bolt are connected together, the bolt both in contact with the inner shell as well as with the outer shell brought, the bolt and the two shells in the region of the contact zones pressed against each other and the bolt is set in rotation, in the two contact zones by the frictional heat generated there to melt the bolt and the two shells and thereby a welded joint between the bolt and the two Bring about shells.

A such pin friction welding allows a very efficient production of the double shell, using it with this method in particular also possible, the bolt in the same step to weld with the inner and the outer shell.

According to one preferred practical embodiment of the invention Procedure, the bolt is correspondingly at the same time against both shells Pressed with a rotation of the bolt at the same time to weld with both shells.

advantageously, is after the melting of the bolt and the two shells in the Contact zones the rotation of the bolt set and the bolt and the bowls pressed against each other until the welded joint has cooled to a predetermined temperature.

there is the pressure for further pressing against each other Bolzens and a respective shell preferably chosen so that he is at least substantially the same or even higher is the contact pressure during the previous welding process.

From Advantage is especially if one of the two shells an opening is provided and the bolt with one end passed through this opening and with this End is pressed against the other shell to deal with this Make frictional contact.

Conveniently, in this case, the bolt with the opening having Shell contacted via a seat, over the frictional contact between the bolt and this shell is made. Thus, with each of the two shells is a friction surface given, which is heated upon rotation of the bolt and then forms the welded zone. For example, the bolt can be welded to both shells at the same time become.

Of the Frictional contact between the bolt and the opening having Shell can, for example, have a straight or conical shape executed seat are made.

It may be the inner or outer shell provided with the respective opening. The principle of Double friction welding works the same way in both cases.

One Overhang occurring in the area of the opening The bolt can be removed after the welding process.

According to one expedient practical embodiment of the invention Procedure is the radial distance between the two shells at least during the welding process by between adhered to the shells introduced support elements. These can, for example, not yet welded openings introduced in the vicinity of the respective weld become. With progressive welding also work the already welded bolts as supports.

alternative or in addition, the two shells can at least during the welding process at least partially but also by magnetically and / or pneumatically applied holding forces be supported.

According to one further advantageous embodiment of the invention Method, a sleeve-like bolt is used. there This sleeve-like bolt with its two end faces brought into contact with the two shells. About the preferably by means of a particular introduced by a shell opening coaxial driver induced rotation of the sleeve-like Bolzens will then be on both ends with the two Shells welded.

A further advantageous embodiment of the invention Method is characterized in that a two-part running Bolt is used and the one bolt part with one of the two Shells and the other bolt part welded to another shell becomes. With the use of such a bipartite executed Bolzens will be a better separation or control of Reibschweißprozesse allows. For example, speed and / or contact force for the two contact zones separately be controlled or controlled and / or regulated.

The Both bolt parts can be used simultaneously with the two shells or also successively welded to the respective shell become.

there In particular, such an embodiment of the method is conceivable, in which the two bolt parts only during or after the concerning the connection between the bolt and the shells Welding process connected, preferably welded, become. If the two bolt parts with time in succession welded the respective shell, so should when welding the last bolt seam ensures the shell in question be that the two bolt parts are interconnected. This can be done, for example, that the bolt parts after the Switching off the rotary motion due to the high frictional heat merge together or, for example, by special shaped bolts and / or sleeves used in friction welding then be compressed accordingly by the axial contact pressure and the like a rivet a positive connection received.

The Both shells can in particular have a variety be connected by bolts. They can do this Bolt on different or in the same way and Way to be welded with the two shells.

The Invention will be described below with reference to exemplary embodiments explained in more detail with reference to the drawing; in this show:

1 a schematic representation of an example of the production of a double shell using at least one bolt which is inserted via an opening provided in the outer shell,

2 a schematic representation of one with the example according to 1 comparable example, but in the present case the bolts are inserted through openings provided in the inner shell,

3 a schematic representation of another example of the production of a double shell, in which a sleeve-like bolt is used, whose end faces are welded to the two shells, and

4 a schematic representation of another example of the production of a double shell, in which a two-piece executed bolt is used.

1 shows a schematic representation of an example of the production of an inner shell 10 and an outer shell 12 comprehensive double shell 14 a cylinder, which may in particular be a cylinder or drying cylinder of a so-called BoostDryer unit. Here are the inner and outer shell 10 respectively. 12 over at least one bolt 16 connected with each other. Conveniently, a plurality of such bolts 16 provided, wherein in the 1 however, only one is shown.

The bolt 16 comes with both the inner shell 10 as well as with the outer shell 12 brought into contact. The bolt 16 and the two bowls 10 . 12 be in the range of the two contact zones 18 . 20 pressed against each other. In addition, the bolt 16 set in rotation to move in the two contact zones 18 . 20 by the resulting frictional heat the bolt 16 and the two bowls 10 . 12 to melt and thereby a welded joint 22 between the bolt 16 and the two bowls 10 . 12 bring about.

The bolt 16 can simultaneously against both shells 10 . 12 pressed to a rotation of the bolt 16 this simultaneously with both shells 10 . 12 to weld.

As is clear from the 1 results in the present case, one of the two shells 10 . 12 in the present case, for example, the outer shell 12 with an opening of the bore 24 provided and a respective bolt 16 with one end through this opening 24 passed. With this end will be the bolt 16 then against the other shell, so here, for example, the inner shell 10 pressed to make the relevant frictional contact with this.

With the opening 24 having outer shell 12 becomes the bolt 16 over a seat 26 brought into contact. In this case, the frictional contact between the bolt 16 and this outer shell 12 over this seat 26 produced.

In the present case, the frictional contact between the bolt 16 and the opening 24 having outer shell 12 for example, via a cone-shaped seat 26 produced. However, it is also conceivable, for example, a straight seat.

One in the area of the opening 24 occurring overhang of the bolt 16 can be removed after the welding process.

As based on the 1 It can be seen, in the present case, the bolt 16 about being over the opening 24 upwardly projecting end rotated. This will be the bolt 16 as by arrows 28 indicated, at the same time against the inner shell 10 and, in the area of the seat 26 , the outer shell 12 pressed.

In the present stud friction welding so the bolt 16 to the workpiece, that is one or both shells 10 . 12 pressed, with which it is to be welded. The bolt 16 is set in rotation. The frictional heat causes the bolt to melt 16 and the bowls 10 . 12 in the contact zones 18 . 20 on. The rotation is interrupted and the contact pressure is maintained or even amplified until the weld has cooled.

To the double shell 14 In the present case, one of the shells becomes 10 . 12 with an opening 24 provided, for example, drilled. The bolt 16 gets through this opening 24 passed through and sits to weld with its respective end on the other or not drilled shell 10 on. With the opening 24 having shell 12 is the bolt 16 through a seat 26 in contact, which may be straight or tapered. This is with each of the two shells 10 . 12 given a friction surface with the rotating bolt 16 is heated and then forms the welded zone. This can be the bolt 16 for example, simultaneously with both shells 10 . 12 be welded.

It does not matter if the inner or the outer shell 10 respectively. 12 of the cylinder is drilled. The principle of double friction welding works the same way in both cases. A possibly disturbing projection of the bolt 16 can be removed after welding. By a defined distance between the two shells 10 . 12 To hold support elements can be introduced, for example, not yet welded openings in the vicinity of the weld. As the welding progresses, the already welded-in bolts act 16 as supports. Alternatively or additionally, to support one or both shells 10 . 12 For example, magnetic or pneumatic corresponding holding forces are applied.

2 shows a schematic representation of a with the example according to 1 Comparative example, the bolts 16 in the present case, however, in the inner shell 10 provided openings 24 be introduced. Accordingly, the bolts 16 here also rotated from the opposite side.

Moreover, the method can at least essentially be carried out again as described in connection with the 1 has been described. Corresponding parts are assigned the same reference numerals.

3 shows a schematic representation of another example of the production of a double shell 14 in which a sleeve-like bolt 16 is used, whose end faces with the two shells 10 . 12 be welded. This is the sleeve-like bolt 16 with his two Stirnsei th with the two shells 10 . 12 brought into contact. Hereby, as by the arrows 30 indicated, for example, the outer shell 12 against the one end of the bolt 16 and with it the bolt 16 with its other front side also against the inner shell 12 pressed.

The bolt 16 can, for example, via egg in particular through an opening 32 for example in the outer shell 12 introduced coaxial driver 34 be set in rotation. By the rotation of the sleeve-like bolt 16 this is then at its two end faces to form the welded joint 22 with the two bowls 10 . 12 welded.

With the present variant of Doppelreibschweißung so a sleeve-like bolt 16 set in rotation, which is welded with its two end faces, wherein the sleeve-like bolt 16 for example via a coaxial driver 34 can be rotated.

4 shows a schematic representation of another example of the production of a double shell 14 in which a two-part executed bolt 16 is used.

Here is the one bolt part 16 ' for example, with the inner shell 10 and the other bolt part 16 '' with the outer shell 12 welded to the welded joint 22 manufacture.

In doing so, the two bolt parts 16 ' . 16 '' simultaneously with the two bowls 10 . 12 or also one after the other with the respective shell 10 respectively. 12 be welded.

The two bolt parts 16 ' . 16 '' For example, the connection between the bolts can only be made during or after the connection 16 and the bowls 10 . 12 relevant welding process connected to each other, preferably welded.

As based on the 4 can be seen, especially if the two bolt parts 16 ' . 16 '' are not connected to each other from the outset, these bolt parts 16 ' . 16 '' separated against the respective shell 10 respectively. 12 pressed and / or rotated separately. With such a two-part executed bolt 16 So for example, is a separate welding of bolts 16 with the inner shell 10 and the outer shell 12 possible.

With the use of such a two-piece bolt executed 16 In particular, a better separation or control of the friction welding processes is possible. As a result, rotational speed and / or contact force can be controlled or controlled and / or regulated separately from one another. The process can also be executed at different times. When welding the last bolt seam to the shell then it must be ensured that the two bolt parts 16 ' . 16 '' connected to each other. This can be done, for example, that these bolt parts 16 ' . 16 '' merge together after switching off the rotary motion by the high frictional heat. However, it is also conceivable to use specially shaped bolt parts, one of which, for example, is designed as a sleeve, which are then correspondingly compressed during friction welding by the axial contact pressure and, like a rivet, form a positive connection.

10

inner shell

12

outer shell

14

clamshell

16

bolt

16 '

bolt part

16 ''

bolt part

18

contact zone

20

contact zone

22

welded joint

24

Opening, drilling

26

Seat

28

arrow

30

arrow

32

opening

34

takeaway

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 patent literature

• - EP 1780331 A [0002]
• WO 2006/072505 A [0002]
• WO 2005/100682 A [0002]
• - DE 102004017810 A [0002]

Claims (15)

Method for producing an inner shell and an outer shell ( 10 respectively. 12 ) double shell ( 14 ) of a cylinder, in particular a cylinder of a BoostDryer unit, in which the inner and the outer shell ( 10 respectively. 12 ) via at least one bolt ( 16 ), the bolt ( 16 ) with both the inner shell ( 10 ) as well as with the outer shell ( 12 ), the bolt ( 16 ) and the two shells ( 10 . 12 ) in the region of the contact zones ( 18 . 20 ) are pressed against each other and the bolt ( 16 ) is set in rotation to be in the two contact zones ( 18 . 20 ) by the frictional heat generated there the bolt ( 16 ) and the two shells ( 10 . 12 ) to melt and thereby a welded joint ( 22 ) between the bolt ( 16 ) and the two shells ( 10 . 12 ). Method according to claim 1, characterized in that the bolt ( 16 ) at the same time against both shells ( 10 . 12 ) is pressed to a rotation of the bolt ( 16 ) simultaneously with both shells ( 10 . 12 ) to be welded. Method according to claim 1 or 2, characterized in that after the melting of the bolt ( 16 ) and the two shells ( 10 . 12 ) in the contact zones ( 18 . 20 ) the rotation of the bolt ( 16 ) and the bolt ( 16 ) and the shells ( 10 . 12 ) are pressed against each other ge until the weld is cooled to a predetermined temperature. Method according to claim 3, characterized that pressure for further pressing against each other like that it is chosen that he is at least substantially the same or higher than the contact pressure during the previous welding process. Method according to one of the preceding claims, characterized in that a ( 12 ) of the two shells ( 10 . 12 ) with an opening ( 24 ) and that the bolt ( 16 ) with one end through this opening ( 24 ) and with this end against the other shell ( 10 ) is pressed in order to produce with this the relevant frictional contact. Method according to claim 5, characterized in that the bolt ( 16 ) with which the opening ( 24 ) shell ( 12 ) over a seat ( 26 ) and that the frictional contact between the bolt ( 16 ) and this shell ( 12 ) over this seat ( 26 ) will be produced. A method according to claim 6, characterized in that the frictional contact between the bolt ( 16 ) and the opening ( 24 ) shell ( 12 ) via a straight or conical seat ( 26 ) will be produced. A method according to claim 6 or 7, characterized in that a in the region of the opening ( 24 ) protrusion of the bolt ( 16 ) is removed after the welding process. Method according to one of the preceding claims, characterized in that the radial distance between the two shells ( 10 . 12 ) at least during the welding process between the shells ( 10 . 12 ) introduced support elements is maintained. Method according to one of the preceding claims, characterized in that the two shells ( 10 . 12 ) are at least partially supported by magnetically and / or pneumatically applied holding forces at least during the welding process. Method according to one of the preceding claims, characterized in that a sleeve-like bolt is used, that the sleeve-like bolt ( 16 ) with its two end faces with the two shells ( 10 . 12 ) and that via the preferably by means of a particular through a shell opening ( 32 ) introduced coaxial driver ( 34 ) induced rotation of the sleeve-like bolt ( 16 ) this at its two end faces with the two shells ( 10 . 12 ) is welded. Method according to one of claims 1 to 10, characterized in that a two-part executed bolt ( 16 ) is used and that the one bolt part ( 16 ' ) with a ( 10 ) of the two shells ( 10 . 12 ) and the other bolt part ( 16 '' ) with the other shell ( 12 ) is welded. Method according to claim 12, characterized in that the two bolt parts ( 16 ' . 16 '' ) simultaneously with the two shells ( 10 . 12 ) are welded. Method according to claim 13, characterized in that the two bolt parts ( 16 ' . 16 '' ) in time with the respective shell ( 10 respectively. 12 ) are welded. Method according to claim 13 or 14, characterized in that the two bolt parts ( 16 ' . 16 '' ) only during or after the connection between the bolt ( 16 ) and the shells ( 10 . 12 ) associated welding process, preferably welded, are.