CA2094682A1 - Method and bending machine for making a piece of bent wire or tube including an upset part - Google Patents
Method and bending machine for making a piece of bent wire or tube including an upset partInfo
- Publication number
- CA2094682A1 CA2094682A1 CA002094682A CA2094682A CA2094682A1 CA 2094682 A1 CA2094682 A1 CA 2094682A1 CA 002094682 A CA002094682 A CA 002094682A CA 2094682 A CA2094682 A CA 2094682A CA 2094682 A1 CA2094682 A1 CA 2094682A1
- Authority
- CA
- Canada
- Prior art keywords
- clamping jaws
- bending machine
- wire
- upsetting
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000005452 bending Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000011324 bead Substances 0.000 claims description 35
- 238000000465 moulding Methods 0.000 claims description 30
- 238000003825 pressing Methods 0.000 claims description 19
- 208000010727 head pressing Diseases 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/025—Special design or construction with rolling or wobbling dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
ABSTRACT
In a method for making a bent wire or tube piece having at least one integral upset part wherein the wire or tube piece is bent in a bending machine and the upset part is formed by upsetting, the wire or tube piece is gripped in the bending machine with the aid of laterally engaging clamping jaws which leave a protruding end, and the upset part is molded in the bending machine by upsetting the end of the wire or tube piece against the clamping jaws. In the wire or tube bending machine which is suited for performing the method, a clamping device which comprises clamping jaws movable towards each other in a direction transverse to the feed axis is provided in feed direction behind a feed means, and at least one upsetting tool is provided in the feed direction behind the clamping jaws, and the upsetting tool and/or the clamping device is/are movably arranged in the bending machine in the direction of the feed axis.
In a method for making a bent wire or tube piece having at least one integral upset part wherein the wire or tube piece is bent in a bending machine and the upset part is formed by upsetting, the wire or tube piece is gripped in the bending machine with the aid of laterally engaging clamping jaws which leave a protruding end, and the upset part is molded in the bending machine by upsetting the end of the wire or tube piece against the clamping jaws. In the wire or tube bending machine which is suited for performing the method, a clamping device which comprises clamping jaws movable towards each other in a direction transverse to the feed axis is provided in feed direction behind a feed means, and at least one upsetting tool is provided in the feed direction behind the clamping jaws, and the upsetting tool and/or the clamping device is/are movably arranged in the bending machine in the direction of the feed axis.
Description
2 0 ~ 2 MET~OD AND BENDIN~ MACHINE FOR MARING A PIECE OF BENT WI~E
OR TUBE INCLUDIN~ AN UP~ET PART
The present invention relates to a method according to the preamble of claim 1 and to a bending machine for performing the method according to the preamble of patPnt claim 2.
It is generally known that wire or tube pieces are bent in bending machines (DE-B-37 12 110 and DE-B-38 25 393). A
wire or tube is withdrawn from a coil, oriented and introduced with the aid of a feed means into the bending machine. Drivable bending means make predetermined bends in the stepwise advanced wire or tube until a severing means severs the piece of bent wire or tube which is then ejected. In practice, there are applications where the provision of an upset piece is desired within the piece of wire or tube or at least on an end thereof. An example is given by the suspension of a muffler on the chassis of an automotive vehicle. A first piece of bent wire or tube is welded to the chassis whereas a second piece of bent wire or tube is welded to the muffler. The two free ends of the wire or tube pieces are connected through a rubber element which comprises insertion openings for the ends of the two -wire or tube pieces. The upset parts are to prevent the ends of the two wire or tube pieces from independently disengaging from the openings of the rubber element. A
possibly molded bevel at the free end facilitates introduction. While the bending of wire or tube pieces in a bending machine has already reached a high level of automation, upset parts are subsequently molded in machines specifically provided for this purpose. This calls for ` ' ' '~ ` ` ' `' ' ,' ` ' '"` '` ''"' ' '' . ' '; . -' ,; ' ; ' ' ','. ' ,'' ' ' :" " ': ;' "
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additional operations as well as space and is time- and labor-consuming, which is especially unwanted for an inexpensive mass production.
It is the object of the present invention to improve a method and a bending machine of the above-mentioned type in such a way that bent wire or tube pieces having at least on~ upset part aan be made in an economic way.
In combination with the features of the preamble of claim 1, this object is technically attained in accordance with the invention in that the piece of wire or tube is gripped in the bending machine by laterally engaging clamping jaws which leave a protruding end of the wire or tube piece, and that the upset part is molded in the bending machine by upsetting the end of the wire or tube piece against the clamping jaws. As for the associated bending machine, the ob;ect is attained according to the invention in combination with the features of the preamble of claim 2 in that a clamping device which comprises clamping jaws that are movable towards each other in a direction transverse to the feed axis is provided in feed direction behind the feed means, and at least one upsetting tool is provided behind the clamping jaws, and that the upsetting tool and/or the clamping device is/are movably arranged in the bending machine in the direction of the feed axis.
This permits the molding of an upset part, such as a bead, within the piece length, and/or of a head and/or of a bevel at the end of the tube or wire piece inside the bending machine, i.e., before, during or after the bending operation. The feed means provided for the bending operations may be used for transferring the piece of wire or tube to the deformation means consisting of the clamping jaws and the upsetting tool. The wire or tube pieces are already fixed in the bending machine with the at least one molded upset part. This permits an economic mass production .
:
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~ 3 2~9~2 on the one hand and is inexpensive even in the case of small lot sizes on the other hand.
If a wobble riveting head is provided as the upsetting tool, the f~ee projecting end of the piece of tube or wire is riveted against the outside of the clamping jaws. Since the piece of wire or tube is positioned in the plane of division of the clamping jaws, the finished workpiece can be easily removed from the mold despite the head after the clamping jaws have been moved apart.
In a preferred embodiment the clamping jaws are provided with a counter shoulder surrounded by an edge and they have opposite projections on their clamping surfaces. The free end of the piece of wire or tube is riveted against the counter shoulder to achieve a defined head shape. The edge in the form of a truncated cone leaves some space for putting the wobble riveting head thereon. The projections effect an especially high specific contact pressure force.
As a result, the forces to be applied onto the clamping jaws can be kept relatively small. An especially strong positive grip can be achieved with the projections. -`
In another embodiment the upsetting tool is a head pressing punch. The punch must predominantly be displaced in the direction of the feed axis only for molding the head on the clamping jaws.
, In another embodiment the upsetting tool is a pressing `
punch with a bevel molding cavity. The bevel needed at the end of the wire or tube piece is formed by linear pressing, a bead being not necessarily formed at the same time.
In another embodiment the upsetting tool is a pressing punch with a bead upsetting face and a cylindrical molding cavity. A bead is formed with the aid of the upsetting tool '~ ' ,' '' ' ' .
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by predominantly linear pressing within the piece length, the clamping jaws acting as a counter-holder.
In another embodiment the upsetting tool is a pressing punch having a cylindrical molding cavity, a bead upsetting ~ace and an inner bevel pressing section. A bead is formed with thls upsetting tool through a linear pressing movement on the clamping jaws. A bevel is formed with the aid of the bevel pressing section at the free end at about the same time. The free end of the tube or wire piece is supported during the deformation process in the cylindrical molding cavity.
In another embodiment the upsetting tool is formed by additional clamping jaws which can be moved towards each other in a direction transverse to the feed axis. The additional clamping jaws grip the free end projecting beyond the clamping jaws and form a bead within the piece length between themselves and the clamping jaws by way of a feed movement towards the clamping jaws. If the length of the projecting end is considerably greater than the width of the additional clamping jaws, a head or bevel can additionally be upset against the additional clamping jaws on the free end projecting from the additional clamping jaws. This is especially easy if in another embodiment the additional clamping jaws are provided between the clamping device and the head pressing punch or the wobble riveting head or the bevel pressing punch.
In a further embodiment it is of advantage when the additional clamping jaws can be moved in the direction of the feed axis, i.e., either by means of a separate drive or in a floating bearing by means of the head pressing punch moved by a drive. If the other clamping jaws can be moved individually, the bead can be deformed independently of the formation of the bevel or head. By contrast, if the other clamping jaws are supported in a floating manner, the head , .
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pressing punch has to form both the bead and the head or the bevel. These de~ormation processes may take place simultaneously or subsequently.
Each of the clamping jaws is expediently connected to a hydraulic actuator. The clamping force can easily be ad~usted through hydraulic pressure and the clamping jaws c~n sensitively be adjusted in the desired way.
In another advantageous development the actuator carrying the wobble riveting head is a rotatably supported shaft which is adapted to be rotated via an electric motor and can be adjusted by the hydraulic actuator. The free end of the wire or tube piece is deformed against the clamping jaws by simultaneously rotating and displacing the shaft.
The production of a wire or tube piece with at least one integrally molded upset part can be further simplified by providing a control device which automatically activates the hydraulic actuators and the other drives after the clamping jaws have been closed in order to form the upset part(s) or to form the head by means of the wobble riveting head.
If two clamping means and upsetting tools are respectively provided on the bending machine, upset parts can be formed with the desired shape in a simple way at the two free ends or within the piece length, which may be desirable in some cases of application.
~ . :
Embodiments of the subject matter of the invention shall now be explained with reference to the drawing, wherein:
FIG. 1 is a diagrammatic view of a bending machine comprising bending means, severing means and an additional `~ deformation means;
" ' ' .
6 ~ 6g2 FIG. 2 is an enlarged sectional view of an embodiment of a deformation means of FIG. 1;
FIG. 3 is an enlarged view of detail III of FIG. 2;
FIG. ~ shows the detail of FIG. 3 after a head has been formed; and FIGS. show various detail variants of the . 5-12 deformation means.
As illustrated in FIG. l, a wire or tube bending machine 1 .
includes three areas outlined in broken lines, which comprise different means, namely bending means 2, a severing means and a deformation means 4 for shaping an .
integral upset part in a respective wire or tube piece 5.
The three illustrated areas need not necessarily be arranged in the order shown in FIG. 1. Rather, the order depends on the kind of wire or tube piece 5 to be made.
~ . , .
To make the wire or tube piece 5, bending machine l has .
supplied thereto a wire or tube C which is removed from a - reel 6 in feed direction S. The wire or tube C passes through the individual areas of bending machine l in the predetermined way and is finally ejected as a severed wire I or tube piece 5 which has been bent into its final shape and is equipped with at least one integral upset part T .
(FIG. 4).
FIG. 2 illustrates a deformation means 4 which is constructed as a riveting device and provided in bending machine 1. Deformation means 4 includes a casing 7 which has provided thereon clamping jaws 8, 9 which are adapted to be fed in a direction transverse to feed direction S and . . .
.. - - :
, - , ,: . .. :
20~6~2 which are, e.g., driven by hydraulic cylinders 10, 11 and supported in the direction of the feed axis on casing 7 or the chassis of bending machine 1. A wobble riveting means 12 is arranged in feed direction S behind clamping jaws 8, 9. The wobble riveting means includes a wobble riveting he~d 13 with an obliquely inserted tool insert 14 as up8~tting tool W. The wobble riveting head 13 is mounted on the end o~ a shaPt 16 which is rotatably supported in two casing supports 15. Shaft 16 has mounted thereon a gear in such a way that the latter is secured against rotation, but displaceable in the axial direction of shaft 16. Gear 17 is held in position by casing supports 15 and prevented from getting displaced with shaft 16. A pinion 18 of an asynchronous motor 19 is provided in spaced-apart parallel relationship with gear 17, with the asynchronous motor 19 driving shaft 16, e~g., via a too~hed belt or a chain 20 or a transmlsslon.
The end of shaft 16 which is opposite to the wobble riveting head 13 has provided thereat a bearing unit 21 which comprises a fastening reception 22 for a piston rod 23 of a hydraulic cylinder 24. The fastening reception 22 is rotatably supported relative to shaft 16. Shaft 16 can be reciprocated in the direction of the double-headed arrow in FIG. 2 with the aid of hydraulic cylinder 24.
Furthermore, there is provided a control device 25 which has connected thereto the hydraulic cylinders 10, 11 and 24 or the control valves thereof, as well as the asynchronous motor 19. A similar control device is also provided for the embodiments of FIGS. 5-12 for operating the movable components.
In FIG. 3, the clamping jaws 8, 9 are moved towards each other and hold the wire or tube piece 5 in such a firm way that a free end 26 projects from the clamping jaws 8, 9 in feed direction S. The clamping surfaces of the clamping . ... .
, .
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209~82 jaws 8, 9 have projections 27 which dig int~ the surface of the wire or tube. A counter shoulder 28 whirh faces the wobble riveting head 13 and which is surrounded by an edge having the shape of a truncated cone follows projections 27.
E~i~L ' : .
I~ a head 29 is to be molded as an upset part T (FIGS. 3, 4), the free end 26 is moved with a feed means (not shown in more detail) between the clamping jaws 8, 9 until the free end 26 projects therefrom. The free end 26 is so long that its volume approximately corresponds to the volume of head 29 to be molded.
As soon as clamping jaws 8, 9 are closed, the control device 25 has the effect that the hydraulic cylinder 24 and the asynchronous motor 19 become operative. The asynchronous motor 19 rotates the shaft 16 and the wobble riveting head 13. The hydraulic cylinder 24 pushes shaft 16 in direction D (FIG. 3) onto the free end 26. The free end 26 is molded into head 29 by the inclinded tool insert 14.
The force applied by the wobble riveting head 13 is carried by the casing 7 or the chassis of the bending machine which -supports the clamping jaws 8, 9. The shape of head 29 is determined by the counter shoulder 28 and the inclined tool insert 14. As soon as the molding process for head 29 has been concluded, the control device 25 ensures that the asynchronous motor 19 is deactivated and the hydraulic cylinder 24 is switched over, so that shaft 16 is retracted. Subsequently, the clamping jaws 8, 9 are opened, whereupon the wire or tube piece 5 is further processed or ejected in case it has already been bent and severed.
In the embodiment according to FIG. 5, head 29 which foxms the upset part T is made by means of a head pressing punch 30 which includes an open molding cavity having, e.g., the .
.
- . : . , :
9 209~68~ ~
-shape of a truncated cone, and which is pressed in ~irection D against the closed clamping jaws 8, 9 that retain the tube or wire piece 5. The undeformed end which first protrudes is outlined in broken line. Furthermore, it is shown in FIG. 5 that the tube or wire piece 5 selectively consists of solid material at 5a or of tubing ak 5b, expediently of a metallic material. Furthermore, it is illustrated in FIG. 5 that, instead of the head pressing punch 30, the clamping jaws 8, 9 are displaced in direction D' to mold head 29. The head pressing punch 30 is then supported. However, it is also possible to displace the two components relative to each other. Furthermore, it is possible to provide the molding cavity 31 in clamping jaws 8, 9. The face of punch 30 could then be even. The molding cavity could also be of another configuration.
In the embodiment according to FIG. 6, the upset part T
which is to be molded is, e.g., a conical bevel 33 on the free end of the tube or wire piece 5. The clamping jaws 8, 9 hold the tube or wire piece 5 in such a way that a predetermined piece of the free end projects beyond the clamping jaws 8, 9. The upsetting tool W is a bevel pressing punch 32 having a conical molding cavity 34 which is, e.g., extended in a blind hole 35. Punch 32 is moved in the direction of arrow D towards the closed clamping jaws `
8, 9. However, when punch 32 is stationary, it is also possible to move the clamping jaws 8, 9 towards the punch -or the two relative to each other. In FIG. 6, the bevel `
pressing punch 3 has a face 36 which can be used for forming an upset part. The upset part ~ is here possibly a bead 38 which could be molded either in front of bevel 33 between face 36 and the even surfaces of clamping jaws 8, i`
9, or in a molding cavity 36 (shown in bro~en line) either in clamping jaws 8, 9 or also in the face 36 of punch 32.
In the embodiment according to FIG. 7, the upset part T is a bead 38 within the piece length. A pressing punch 39 209d~682 having a cylindrical molding cavity 40 is pushed in direction ~ beyond the free end 26 and upsets the latter, so that bead 38 is formed between the clamping jaws 8, 9 and the face 42 of punch 39. To be able to mold bead 38 in a neat way, the inlet into the molding cavity 40 is possibly hollowed as a negative mold (outlined at 41) for bead 38. Either punch 39 and/or the clamping jaws 8, 9 in their entirety are adjusted along the feed axis. An abutment G (illustrated) constitutes either the support of the clamping jaws 8, 9 in the bending machine or a drive part with which the clamping jaws 8, 9 are adjustable - relative to the punch 39.
!
In the embodiment illustrated in FIG. 8, a bead 38 is molded within the piece length. To this end, the wire or tube piece 5 is fixed between the clamping jaws 8, 9 and then gripped by additional clamping jaws 8', 9' at a distance in front of clamping jaws 8, 9, the additional clamping jaws 8', 9' being displaced in direction D
relative to clamping jaws 8, 9. Molding cavities 37 are expediently provided in the faces of the two pairs of clamping jaws 8, 9, 8', 9' for neatly molding bead 38. The free end 26 of the wire or tube piece 5 projects, e.g., beyond the additional clamping jaws 8', 9' and may additionally be provided with a head 29 or a bevel 33 if this is necessary. Furthermore, it is outlined in FIG. 8 that either clamping jaws 8, 9 or/and the additional clamping jaws 8', 9' are adjustable along the feed axis.
In the embodiment of FIG. 9, two upset parts T are r integrally molded on the wire or tube piece 5, i.e. a bead39 within the piece length and a head 29 at the free end.
The wire or tube piece 5 is first fixed with the aid of clamping jaws 8, 9. The additional clamping jaws 8', 9' then act on the free end 26 at a distance from clamping jaws 9, 9. The free end 26 also projects beyond the additional clamping jaws 8', 9'. The head pressing punch 30 :
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is then put on this projecting end. The clamping jaws 8, 9 -being supported, bead 38 can be molded by displacing the . :
additional clamping jaws 8', 9' towards clamping jaws 8, 9.
Head 29 is subsequently formed by displacing punch 30 in :
direction D. However, it is also possible to support the additional clamping jaws 8', 9' in a floating way following clo~ing in the direction of the feed axis and to mold head 29 with the aid of punch 30. As soon as head 29 has been molded or also during the molding of head 29, punch 30 is further moved in direction D until it takes along the additional clamping jaws 8', 9' and molds bead 38 therewith. It would also be possible to retain the additional clamping jaws 8', 9' and to displace clamping jaws 8, 9 in the feed direction and punch 30 in a direction opposite to the feed direction. As another alternative, punch 30 could be fixed and only clamping jaws 8, 9 are moved in feed direction to mold head 21 and bead 38.
In the embodiment of FIG. 10, two spaced-apart upset parts are molded, namely a bead 38 and a bevel 33 at the free .: end. The clamping jaws 8, 9 retain the tube and wire piece 5. Punch 43 which comprises a molding cavity 44 with a conical bevel molding section 44' is then displaced in direction D. A molding cavity 37 for bead 38 is optionally molded into face 36 of punch 43. The length of the free . ..
projecting end 26 i5 dimensioned such that bevel 33 is first molded in section 44', and it is only then that bead ; 38 is optionally molded until abutment of face 36 on clamping jaws 8, 9. :-~......... ' . ~' .
In the embodiment of FIG. 11, two upset parts T are molded on wire or tube piece 5, i.e., a bead 38 and a head 29.
Bead 38 is made in the above-e~plained with the aid of the additional clamping jaws 8', 9' in cooperation with clamping jaws 8, 9 in the above-explained way. The free end .
26 of the wire or tube piece 5 projects beyond the ~ i .
, .
12 2 09 ~ ~ ~ 2 additional clamping jaws 8', 9', thereby enabling wobble riveting head 13 to form head 29. Head 29 may be molded before or after the molding of bead 38. It would also be possible to retain the additional clamping jaws 8', 9' and to displace clamping jaws 8, 9 in the feed direction while wobble riveting head 13 is simultaneously forming the head.
In the embodiment of FIG. 12, two upset parts T are molded on the wire or tube piece 5, i.e., a bead 38 and a bevel 33. To be able to select the distance between bevel 33 and bead 38 independently of the width of the additional ~ `
clamping jaws 8', 9', the bevel pressing punch 32 is used together with its molding cavity 34 independently of the additional clamping jaws 8', 9' that mold bead 38 together with clamping jaws 8, 9.
In FIGS. 9 and 12, the additional clamping jaws 8', 9' which can be reciprocated in the direction of the feed axis could alternately serve as the upsetting tools for molding bead 38 and a head 29, i.e., whenever the distance between head 29 and bead 38 is greater than the width of the additional clamping jaws 8', 9'. The additional clamping jaws 8', 9' are first fixed on the free end and then moved in a direction opposite to the feed direction to mold bead 38. The additional clamping jaws 8', 9' are then reopened and returned to such an extent that they have the correct position for molding head 29. The additional clamping jaws 8', 9' are then closed again for retaining the free end before punch 30 or 32 starts to deform the free projecting ~ end.
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OR TUBE INCLUDIN~ AN UP~ET PART
The present invention relates to a method according to the preamble of claim 1 and to a bending machine for performing the method according to the preamble of patPnt claim 2.
It is generally known that wire or tube pieces are bent in bending machines (DE-B-37 12 110 and DE-B-38 25 393). A
wire or tube is withdrawn from a coil, oriented and introduced with the aid of a feed means into the bending machine. Drivable bending means make predetermined bends in the stepwise advanced wire or tube until a severing means severs the piece of bent wire or tube which is then ejected. In practice, there are applications where the provision of an upset piece is desired within the piece of wire or tube or at least on an end thereof. An example is given by the suspension of a muffler on the chassis of an automotive vehicle. A first piece of bent wire or tube is welded to the chassis whereas a second piece of bent wire or tube is welded to the muffler. The two free ends of the wire or tube pieces are connected through a rubber element which comprises insertion openings for the ends of the two -wire or tube pieces. The upset parts are to prevent the ends of the two wire or tube pieces from independently disengaging from the openings of the rubber element. A
possibly molded bevel at the free end facilitates introduction. While the bending of wire or tube pieces in a bending machine has already reached a high level of automation, upset parts are subsequently molded in machines specifically provided for this purpose. This calls for ` ' ' '~ ` ` ' `' ' ,' ` ' '"` '` ''"' ' '' . ' '; . -' ,; ' ; ' ' ','. ' ,'' ' ' :" " ': ;' "
-` 2 2~9~682 :
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additional operations as well as space and is time- and labor-consuming, which is especially unwanted for an inexpensive mass production.
It is the object of the present invention to improve a method and a bending machine of the above-mentioned type in such a way that bent wire or tube pieces having at least on~ upset part aan be made in an economic way.
In combination with the features of the preamble of claim 1, this object is technically attained in accordance with the invention in that the piece of wire or tube is gripped in the bending machine by laterally engaging clamping jaws which leave a protruding end of the wire or tube piece, and that the upset part is molded in the bending machine by upsetting the end of the wire or tube piece against the clamping jaws. As for the associated bending machine, the ob;ect is attained according to the invention in combination with the features of the preamble of claim 2 in that a clamping device which comprises clamping jaws that are movable towards each other in a direction transverse to the feed axis is provided in feed direction behind the feed means, and at least one upsetting tool is provided behind the clamping jaws, and that the upsetting tool and/or the clamping device is/are movably arranged in the bending machine in the direction of the feed axis.
This permits the molding of an upset part, such as a bead, within the piece length, and/or of a head and/or of a bevel at the end of the tube or wire piece inside the bending machine, i.e., before, during or after the bending operation. The feed means provided for the bending operations may be used for transferring the piece of wire or tube to the deformation means consisting of the clamping jaws and the upsetting tool. The wire or tube pieces are already fixed in the bending machine with the at least one molded upset part. This permits an economic mass production .
:
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~ 3 2~9~2 on the one hand and is inexpensive even in the case of small lot sizes on the other hand.
If a wobble riveting head is provided as the upsetting tool, the f~ee projecting end of the piece of tube or wire is riveted against the outside of the clamping jaws. Since the piece of wire or tube is positioned in the plane of division of the clamping jaws, the finished workpiece can be easily removed from the mold despite the head after the clamping jaws have been moved apart.
In a preferred embodiment the clamping jaws are provided with a counter shoulder surrounded by an edge and they have opposite projections on their clamping surfaces. The free end of the piece of wire or tube is riveted against the counter shoulder to achieve a defined head shape. The edge in the form of a truncated cone leaves some space for putting the wobble riveting head thereon. The projections effect an especially high specific contact pressure force.
As a result, the forces to be applied onto the clamping jaws can be kept relatively small. An especially strong positive grip can be achieved with the projections. -`
In another embodiment the upsetting tool is a head pressing punch. The punch must predominantly be displaced in the direction of the feed axis only for molding the head on the clamping jaws.
, In another embodiment the upsetting tool is a pressing `
punch with a bevel molding cavity. The bevel needed at the end of the wire or tube piece is formed by linear pressing, a bead being not necessarily formed at the same time.
In another embodiment the upsetting tool is a pressing punch with a bead upsetting face and a cylindrical molding cavity. A bead is formed with the aid of the upsetting tool '~ ' ,' '' ' ' .
, , .. . . . . :,; ., .. . .. : ~ .: . . : -~ 20~682 .
by predominantly linear pressing within the piece length, the clamping jaws acting as a counter-holder.
In another embodiment the upsetting tool is a pressing punch having a cylindrical molding cavity, a bead upsetting ~ace and an inner bevel pressing section. A bead is formed with thls upsetting tool through a linear pressing movement on the clamping jaws. A bevel is formed with the aid of the bevel pressing section at the free end at about the same time. The free end of the tube or wire piece is supported during the deformation process in the cylindrical molding cavity.
In another embodiment the upsetting tool is formed by additional clamping jaws which can be moved towards each other in a direction transverse to the feed axis. The additional clamping jaws grip the free end projecting beyond the clamping jaws and form a bead within the piece length between themselves and the clamping jaws by way of a feed movement towards the clamping jaws. If the length of the projecting end is considerably greater than the width of the additional clamping jaws, a head or bevel can additionally be upset against the additional clamping jaws on the free end projecting from the additional clamping jaws. This is especially easy if in another embodiment the additional clamping jaws are provided between the clamping device and the head pressing punch or the wobble riveting head or the bevel pressing punch.
In a further embodiment it is of advantage when the additional clamping jaws can be moved in the direction of the feed axis, i.e., either by means of a separate drive or in a floating bearing by means of the head pressing punch moved by a drive. If the other clamping jaws can be moved individually, the bead can be deformed independently of the formation of the bevel or head. By contrast, if the other clamping jaws are supported in a floating manner, the head , .
~: : -, . . . . . :
pressing punch has to form both the bead and the head or the bevel. These de~ormation processes may take place simultaneously or subsequently.
Each of the clamping jaws is expediently connected to a hydraulic actuator. The clamping force can easily be ad~usted through hydraulic pressure and the clamping jaws c~n sensitively be adjusted in the desired way.
In another advantageous development the actuator carrying the wobble riveting head is a rotatably supported shaft which is adapted to be rotated via an electric motor and can be adjusted by the hydraulic actuator. The free end of the wire or tube piece is deformed against the clamping jaws by simultaneously rotating and displacing the shaft.
The production of a wire or tube piece with at least one integrally molded upset part can be further simplified by providing a control device which automatically activates the hydraulic actuators and the other drives after the clamping jaws have been closed in order to form the upset part(s) or to form the head by means of the wobble riveting head.
If two clamping means and upsetting tools are respectively provided on the bending machine, upset parts can be formed with the desired shape in a simple way at the two free ends or within the piece length, which may be desirable in some cases of application.
~ . :
Embodiments of the subject matter of the invention shall now be explained with reference to the drawing, wherein:
FIG. 1 is a diagrammatic view of a bending machine comprising bending means, severing means and an additional `~ deformation means;
" ' ' .
6 ~ 6g2 FIG. 2 is an enlarged sectional view of an embodiment of a deformation means of FIG. 1;
FIG. 3 is an enlarged view of detail III of FIG. 2;
FIG. ~ shows the detail of FIG. 3 after a head has been formed; and FIGS. show various detail variants of the . 5-12 deformation means.
As illustrated in FIG. l, a wire or tube bending machine 1 .
includes three areas outlined in broken lines, which comprise different means, namely bending means 2, a severing means and a deformation means 4 for shaping an .
integral upset part in a respective wire or tube piece 5.
The three illustrated areas need not necessarily be arranged in the order shown in FIG. 1. Rather, the order depends on the kind of wire or tube piece 5 to be made.
~ . , .
To make the wire or tube piece 5, bending machine l has .
supplied thereto a wire or tube C which is removed from a - reel 6 in feed direction S. The wire or tube C passes through the individual areas of bending machine l in the predetermined way and is finally ejected as a severed wire I or tube piece 5 which has been bent into its final shape and is equipped with at least one integral upset part T .
(FIG. 4).
FIG. 2 illustrates a deformation means 4 which is constructed as a riveting device and provided in bending machine 1. Deformation means 4 includes a casing 7 which has provided thereon clamping jaws 8, 9 which are adapted to be fed in a direction transverse to feed direction S and . . .
.. - - :
, - , ,: . .. :
20~6~2 which are, e.g., driven by hydraulic cylinders 10, 11 and supported in the direction of the feed axis on casing 7 or the chassis of bending machine 1. A wobble riveting means 12 is arranged in feed direction S behind clamping jaws 8, 9. The wobble riveting means includes a wobble riveting he~d 13 with an obliquely inserted tool insert 14 as up8~tting tool W. The wobble riveting head 13 is mounted on the end o~ a shaPt 16 which is rotatably supported in two casing supports 15. Shaft 16 has mounted thereon a gear in such a way that the latter is secured against rotation, but displaceable in the axial direction of shaft 16. Gear 17 is held in position by casing supports 15 and prevented from getting displaced with shaft 16. A pinion 18 of an asynchronous motor 19 is provided in spaced-apart parallel relationship with gear 17, with the asynchronous motor 19 driving shaft 16, e~g., via a too~hed belt or a chain 20 or a transmlsslon.
The end of shaft 16 which is opposite to the wobble riveting head 13 has provided thereat a bearing unit 21 which comprises a fastening reception 22 for a piston rod 23 of a hydraulic cylinder 24. The fastening reception 22 is rotatably supported relative to shaft 16. Shaft 16 can be reciprocated in the direction of the double-headed arrow in FIG. 2 with the aid of hydraulic cylinder 24.
Furthermore, there is provided a control device 25 which has connected thereto the hydraulic cylinders 10, 11 and 24 or the control valves thereof, as well as the asynchronous motor 19. A similar control device is also provided for the embodiments of FIGS. 5-12 for operating the movable components.
In FIG. 3, the clamping jaws 8, 9 are moved towards each other and hold the wire or tube piece 5 in such a firm way that a free end 26 projects from the clamping jaws 8, 9 in feed direction S. The clamping surfaces of the clamping . ... .
, .
. , . ~ ,, .. , ... ~
209~82 jaws 8, 9 have projections 27 which dig int~ the surface of the wire or tube. A counter shoulder 28 whirh faces the wobble riveting head 13 and which is surrounded by an edge having the shape of a truncated cone follows projections 27.
E~i~L ' : .
I~ a head 29 is to be molded as an upset part T (FIGS. 3, 4), the free end 26 is moved with a feed means (not shown in more detail) between the clamping jaws 8, 9 until the free end 26 projects therefrom. The free end 26 is so long that its volume approximately corresponds to the volume of head 29 to be molded.
As soon as clamping jaws 8, 9 are closed, the control device 25 has the effect that the hydraulic cylinder 24 and the asynchronous motor 19 become operative. The asynchronous motor 19 rotates the shaft 16 and the wobble riveting head 13. The hydraulic cylinder 24 pushes shaft 16 in direction D (FIG. 3) onto the free end 26. The free end 26 is molded into head 29 by the inclinded tool insert 14.
The force applied by the wobble riveting head 13 is carried by the casing 7 or the chassis of the bending machine which -supports the clamping jaws 8, 9. The shape of head 29 is determined by the counter shoulder 28 and the inclined tool insert 14. As soon as the molding process for head 29 has been concluded, the control device 25 ensures that the asynchronous motor 19 is deactivated and the hydraulic cylinder 24 is switched over, so that shaft 16 is retracted. Subsequently, the clamping jaws 8, 9 are opened, whereupon the wire or tube piece 5 is further processed or ejected in case it has already been bent and severed.
In the embodiment according to FIG. 5, head 29 which foxms the upset part T is made by means of a head pressing punch 30 which includes an open molding cavity having, e.g., the .
.
- . : . , :
9 209~68~ ~
-shape of a truncated cone, and which is pressed in ~irection D against the closed clamping jaws 8, 9 that retain the tube or wire piece 5. The undeformed end which first protrudes is outlined in broken line. Furthermore, it is shown in FIG. 5 that the tube or wire piece 5 selectively consists of solid material at 5a or of tubing ak 5b, expediently of a metallic material. Furthermore, it is illustrated in FIG. 5 that, instead of the head pressing punch 30, the clamping jaws 8, 9 are displaced in direction D' to mold head 29. The head pressing punch 30 is then supported. However, it is also possible to displace the two components relative to each other. Furthermore, it is possible to provide the molding cavity 31 in clamping jaws 8, 9. The face of punch 30 could then be even. The molding cavity could also be of another configuration.
In the embodiment according to FIG. 6, the upset part T
which is to be molded is, e.g., a conical bevel 33 on the free end of the tube or wire piece 5. The clamping jaws 8, 9 hold the tube or wire piece 5 in such a way that a predetermined piece of the free end projects beyond the clamping jaws 8, 9. The upsetting tool W is a bevel pressing punch 32 having a conical molding cavity 34 which is, e.g., extended in a blind hole 35. Punch 32 is moved in the direction of arrow D towards the closed clamping jaws `
8, 9. However, when punch 32 is stationary, it is also possible to move the clamping jaws 8, 9 towards the punch -or the two relative to each other. In FIG. 6, the bevel `
pressing punch 3 has a face 36 which can be used for forming an upset part. The upset part ~ is here possibly a bead 38 which could be molded either in front of bevel 33 between face 36 and the even surfaces of clamping jaws 8, i`
9, or in a molding cavity 36 (shown in bro~en line) either in clamping jaws 8, 9 or also in the face 36 of punch 32.
In the embodiment according to FIG. 7, the upset part T is a bead 38 within the piece length. A pressing punch 39 209d~682 having a cylindrical molding cavity 40 is pushed in direction ~ beyond the free end 26 and upsets the latter, so that bead 38 is formed between the clamping jaws 8, 9 and the face 42 of punch 39. To be able to mold bead 38 in a neat way, the inlet into the molding cavity 40 is possibly hollowed as a negative mold (outlined at 41) for bead 38. Either punch 39 and/or the clamping jaws 8, 9 in their entirety are adjusted along the feed axis. An abutment G (illustrated) constitutes either the support of the clamping jaws 8, 9 in the bending machine or a drive part with which the clamping jaws 8, 9 are adjustable - relative to the punch 39.
!
In the embodiment illustrated in FIG. 8, a bead 38 is molded within the piece length. To this end, the wire or tube piece 5 is fixed between the clamping jaws 8, 9 and then gripped by additional clamping jaws 8', 9' at a distance in front of clamping jaws 8, 9, the additional clamping jaws 8', 9' being displaced in direction D
relative to clamping jaws 8, 9. Molding cavities 37 are expediently provided in the faces of the two pairs of clamping jaws 8, 9, 8', 9' for neatly molding bead 38. The free end 26 of the wire or tube piece 5 projects, e.g., beyond the additional clamping jaws 8', 9' and may additionally be provided with a head 29 or a bevel 33 if this is necessary. Furthermore, it is outlined in FIG. 8 that either clamping jaws 8, 9 or/and the additional clamping jaws 8', 9' are adjustable along the feed axis.
In the embodiment of FIG. 9, two upset parts T are r integrally molded on the wire or tube piece 5, i.e. a bead39 within the piece length and a head 29 at the free end.
The wire or tube piece 5 is first fixed with the aid of clamping jaws 8, 9. The additional clamping jaws 8', 9' then act on the free end 26 at a distance from clamping jaws 9, 9. The free end 26 also projects beyond the additional clamping jaws 8', 9'. The head pressing punch 30 :
~ , . ~ .
~: :
, ..
-~ 11 20~4682 ~`
. :
is then put on this projecting end. The clamping jaws 8, 9 -being supported, bead 38 can be molded by displacing the . :
additional clamping jaws 8', 9' towards clamping jaws 8, 9.
Head 29 is subsequently formed by displacing punch 30 in :
direction D. However, it is also possible to support the additional clamping jaws 8', 9' in a floating way following clo~ing in the direction of the feed axis and to mold head 29 with the aid of punch 30. As soon as head 29 has been molded or also during the molding of head 29, punch 30 is further moved in direction D until it takes along the additional clamping jaws 8', 9' and molds bead 38 therewith. It would also be possible to retain the additional clamping jaws 8', 9' and to displace clamping jaws 8, 9 in the feed direction and punch 30 in a direction opposite to the feed direction. As another alternative, punch 30 could be fixed and only clamping jaws 8, 9 are moved in feed direction to mold head 21 and bead 38.
In the embodiment of FIG. 10, two spaced-apart upset parts are molded, namely a bead 38 and a bevel 33 at the free .: end. The clamping jaws 8, 9 retain the tube and wire piece 5. Punch 43 which comprises a molding cavity 44 with a conical bevel molding section 44' is then displaced in direction D. A molding cavity 37 for bead 38 is optionally molded into face 36 of punch 43. The length of the free . ..
projecting end 26 i5 dimensioned such that bevel 33 is first molded in section 44', and it is only then that bead ; 38 is optionally molded until abutment of face 36 on clamping jaws 8, 9. :-~......... ' . ~' .
In the embodiment of FIG. 11, two upset parts T are molded on wire or tube piece 5, i.e., a bead 38 and a head 29.
Bead 38 is made in the above-e~plained with the aid of the additional clamping jaws 8', 9' in cooperation with clamping jaws 8, 9 in the above-explained way. The free end .
26 of the wire or tube piece 5 projects beyond the ~ i .
, .
12 2 09 ~ ~ ~ 2 additional clamping jaws 8', 9', thereby enabling wobble riveting head 13 to form head 29. Head 29 may be molded before or after the molding of bead 38. It would also be possible to retain the additional clamping jaws 8', 9' and to displace clamping jaws 8, 9 in the feed direction while wobble riveting head 13 is simultaneously forming the head.
In the embodiment of FIG. 12, two upset parts T are molded on the wire or tube piece 5, i.e., a bead 38 and a bevel 33. To be able to select the distance between bevel 33 and bead 38 independently of the width of the additional ~ `
clamping jaws 8', 9', the bevel pressing punch 32 is used together with its molding cavity 34 independently of the additional clamping jaws 8', 9' that mold bead 38 together with clamping jaws 8, 9.
In FIGS. 9 and 12, the additional clamping jaws 8', 9' which can be reciprocated in the direction of the feed axis could alternately serve as the upsetting tools for molding bead 38 and a head 29, i.e., whenever the distance between head 29 and bead 38 is greater than the width of the additional clamping jaws 8', 9'. The additional clamping jaws 8', 9' are first fixed on the free end and then moved in a direction opposite to the feed direction to mold bead 38. The additional clamping jaws 8', 9' are then reopened and returned to such an extent that they have the correct position for molding head 29. The additional clamping jaws 8', 9' are then closed again for retaining the free end before punch 30 or 32 starts to deform the free projecting ~ end.
:`
.
. , ~ , ~ , :,
Claims (15)
1. A method of making a bent wire or tube piece (5) including at least one integral upset part (T), such as a bead (38), within the piece length, and/or a head (29) and/or a bevel (33) on at least one end (26) of said wire or tube piece (5), wherein said wire or tube piece (5) is bent in a bending machine (1) and said upset part (T) is formed by upsetting, characterized in that said wire or tube piece (5) is gripped in said bending machine (1) with the aid of laterally engaging clamping jaws (8, 9; 8', 9') which leave a protruding end (26) of said wire or tube piece (5), and that said upset part (T) in said bending machine (1) is molded by upsetting said end (26) of said wire or tube piece (5) against said clamping jaws (8, 9;
8', 9').
8', 9').
2. A bending machine (1) for a wire or tube (5) for performing the method according to claim 1, comprising bending means, a severing means and at least one axial feed means for said wire or tube (C), characterized in that a clamping device which includes clamping jaws (8, 9) that are movable towards each other in a direction transverse to the feed axis is provided in feed direction (S) behind said feed means, and at least one upsetting tool (W) is provided behind said clamping jaws (8, 9), and that said upsetting tool (W) and/or said clamping device is/are movably arranged in said bending machine (1) in the direction of said feed axis.
3. A bending machine according to claim 2, characterized in that said upsetting tool (W) is a wobble rivet head (13) which is drivable about the feed axis of said wire or tube and which is arranged at the end of an actuator (16) which is preferably movable in the direction of the feed axis, with said end facing said clamping jaws (8, 9).
4. A bending machine according to claims 2 and 3, characterized in that, in the closed state towards the free end (26) of said wire or tube piece (5), said clamping jaws (8, 9) are provided with a counter shoulder (28) cooperating with said wobble riveting head (13), that said counter shoulder (28) is surrounded by an edge having the shape of a truncated cone, and that said clamping jaws (8, 9) are provided on the clamping surfaces facing each other with opposite projections (27) which follow said counter shoulder (28).
5. A bending machine according to claim 2, characterized in that said upsetting tool (W) is a head pressing punch (30) having a molding cavity (31) corresponding to the head (29) to be molded.
6. A bending machine according to claim 2, characterized in that said upsetting tool (W) is a pressing punch (32) having a tapering bevel molding cavity (34).
7. A bending machine according to claim 2, characterized in that said upsetting tool (W) is a pressing punch (29) having a bead upsetting face (42) and a cylindrical molding cavity (40) whose diameter approximately corresponds to the diameter of the free end (26) of said wire or tube piece (5) which projects beyond said clamping jaws (8, 9).
8. A bending machine according to claim 2, characterized in that said upsetting tool (W) is a pressing punch (43) having a cylindrical molding cavity (44), a bead upsetting face (42, 36) and a bevel pressing section (44') arranged inside said molding cavity (44).
9. A bending machine according to claim 2, characterized in that said upsetting tool (W) is formed by additional clamping jaws (8', 9') which are movable towards each other in a direction transverse to the feed axis for upsetting said bead (38) against said clamping jaws (8, 9).
10. A bending machine according to at least one of claims 2 to 9, characterized in that said additional clamping jaws (8', 9') are provided between said clamping device and said head pressing punch (30) or said wobble riveting head (13) or said bevel pressing punch (32).
11. A bending machine according to at least one of claims 2 to 10, characterized in that said additional clamping jaws (8', 9') are movable in the direction of said feed axis at least towards said clamping jaws (8, 9), either by means of a separate drive means or in a floating bearing by means of said head pressing punch (30) moved by a drive means.
12. A bending machine according to at least one of claims 2 to 11, characterized in that said clamping jaws (8, 9; 8', 9') are connected to a hydraulic actuator (10; 11).
13. A bending machine according to claim 3, characterized in that said actuator which carries said wobble riveting head (13) is designed as a rotatably supported shaft (16) whose end facing away from said wobble riveting head (13) is connected to an axially operating, preferably hydraulic actuator (24), and that said shaft (16) is adapted to be rotated by an electric motor (19) via a gear (17) which is mounted on said shaft such that it is secured against rotation, but is movable axially.
14. A bending machine according to claim 13, characterized in that there is provided a control device (25) which automatically activates said actuator (24) of said shaft (16) and said electric motor (19) after said clamping jaws (8, 9; 8', 9') have been closed, whereby said wobble riveting head (13) is rotatingly pressed about the axis of said shaft (16) onto the free end (26) of said wire or tube piece (5).
15. A bending machine according to at least one of claims 2 to 14, characterized in that clamping devices of which each comprises two clamping jaws (8, 9, 8', 9'), as well as associated upsetting tools (W) are provided for molding upset parts (T) on both ends of said wire or tube piece (5).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4213228.2 | 1992-04-22 | ||
| DE19924213228 DE4213228C1 (en) | 1992-04-22 | 1992-04-22 | |
| EP93105856A EP0566938A1 (en) | 1992-04-22 | 1993-04-08 | Process and bending machine for producing a bended wire or tube part with an upsetted zone |
| EP93105856.4 | 1993-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2094682A1 true CA2094682A1 (en) | 1993-10-23 |
Family
ID=25914128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002094682A Abandoned CA2094682A1 (en) | 1992-04-22 | 1993-04-22 | Method and bending machine for making a piece of bent wire or tube including an upset part |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH06142813A (en) |
| CA (1) | CA2094682A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012197932A (en) * | 2011-03-07 | 2012-10-18 | Jtekt Corp | Manufacturing method for wheel roller bearing device |
-
1993
- 1993-04-22 JP JP5096207A patent/JPH06142813A/en active Pending
- 1993-04-22 CA CA002094682A patent/CA2094682A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06142813A (en) | 1994-05-24 |
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