EP1136155A2 - Process and device for removing punch rivets from a workpiece - Google Patents
Process and device for removing punch rivets from a workpiece Download PDFInfo
- Publication number
- EP1136155A2 EP1136155A2 EP01302304A EP01302304A EP1136155A2 EP 1136155 A2 EP1136155 A2 EP 1136155A2 EP 01302304 A EP01302304 A EP 01302304A EP 01302304 A EP01302304 A EP 01302304A EP 1136155 A2 EP1136155 A2 EP 1136155A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- punch rivet
- threaded mandrel
- workpiece
- punch
- punched
- 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.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/38—Accessories for use in connection with riveting, e.g. pliers for upsetting; Hand tools for riveting
- B21J15/50—Removing or cutting devices for rivets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/02—Riveting procedures
- B21J15/025—Setting self-piercing rivets
Definitions
- the invention relates to a process for removing punch rivets set in a workpiece, which are tubular and axisymmetric in design.
- the invention also relates to devices for carrying out this process.
- German Patent Application 197 26 104 to withdraw a punch rivet with a flat plate-like head or a punch rivet designed axisymmetrically from a workpiece after welding on of a pin.
- a pin is guided in the immediate vicinity of the upper edge or surface of the set punch rivet to subsequently produce a permanent connection between pin and punch rivet through arc welding or resistance welding in the contact region of pin and upper side or upper edge of the punch rivet.
- the pin is then withdrawn with the aid of an abutment arranged radially around the pin, the punch rivet being withdrawn from the workpiece.
- the pin and the withdrawn punch rivet are waste products which can also be recycled.
- a further disadvantage of the known process is that the welding onto the punch rivet thermally changes the surrounding workpiece material which therefore no longer has the same mechanical properties as before.
- This known process is also disadvantageous in that the relatively large and heavy tool for withdrawing the punch rivet has to be placed exactly on the punch rivet head or punch rivet wheel in order to be able to ensure a reliable weld joint with the punch rivet. If the pin does not however sit exactly on the rivet head or the rivet edge the workpiece material can also be thermally stressed during the production of the arc.
- the object of the invention is to facilitate the removal of punch rivets set in a workpiece.
- this is achieved in that upon setting of the punch rivet, a punched-out piece remaining therein is removed by a tool and thereafter a threaded mandrel is screwed into the punch rivet with simultaneous formation of a substantially continuous distinctive thread, which threaded mandrel upon its subsequent withdrawal counter to the pressure of an abutment resting on the workpiece withdraws the punch rivet from the workpiece.
- a very secure connection between the threaded mandrel and the punch rivet is ensured through the use of the threaded mandrel. Furthermore the surrounding material of the workpiece is not thermally stressed.
- a further advantage of the process according to the invention is that the same tool can always be used for withdrawing the punch rivets whereas in the known process a correspondingly large amount of waste is produced by the welding-on of pins which are later thrown away.
- the punched-out piece remaining therein is removed by a tool which is preferably a ram which is applied in the centre of the punch rivet and expels the punched-out piece from its connection to the workpiece.
- a tool which is preferably a ram which is applied in the centre of the punch rivet and expels the punched-out piece from its connection to the workpiece.
- the abutment which is advantageously designed as a hollow cylinder rests on a surface extending concentrically around the punch rivet, which surface is preferably dimensioned such that the pressure forces do not lead to a deformation of the workpiece.
- the abutment can however also be formed from cylinder halves and therefore optionally adapt itself to narrow constructional conditions, as prevail for example in window recesses in the manufacture of cars.
- the threaded mandrel After removal of the punch rivet the threaded mandrel is either removed manually from the screwed-on punch rivet or clamped in a tong-like tool in order to avoid injuries, and the threaded mandrel is unscrewed from the punch rivet with rotation in the opposite direction. The threaded mandrel can then immediately be screwed into the next punch rivet.
- a device for carrying out the process according to the invention is expediently composed of a drive device provided with a clamping chuck for clamping of the threaded mandrel, which drive device rotates the clamping chuck with forward movement and is switched to backward movement, abutments, which are preferably constructed cylindrically, surrounding and being associated with the drive device.
- a sensor is coupled to the drive device, which sensor measures the forward movement of a forward movement spindle and after an adjustable forward movement stops the rotation of the forward movement spindle and switches this to backward movement.
- the device according to the invention has a threaded mandrel which is optionally provided at its tip with a ram for expelling the punched-out piece or a drill bit which can expel or drill out the punched-out piece from the punch rivet.
- a ram for expelling the punched-out piece
- a drill bit which can expel or drill out the punched-out piece from the punch rivet.
- the movement steps of the device according to the invention required for the process according to the invention can take place using a drill bit on the tip of the threaded mandrel through the forward movement spindle which changes its speed accordingly in accordance with the machining requirements.
- the forward movement spindle can be provided with a hydraulic device, the steps of which are matched to one another by means of a known processor.
- Fig. 1a shows a punch rivet 7 in accordance with the above mentioned DE-OS 197 26 104 which is constructed axisymmetrically.
- Fig. 1b the same punch rivet is shown in perspective view.
- the punch rivet 7 has the male side 8 on one side and the female side 9 on its opposing side. Both the male side 8 and the female side 9 are provided with a surrounding cutting edge 10 and 11 in each case.
- Fig. 1b shows the same punch rivet 7 in perspective view.
- Fig. 2a the riveting of two sheets 12 and 13 which form the workpiece is illustrated by means of the punch rivet 23, which is based on the punch rivet 7 in accordance with Fig. la and 1b.
- the punch rivet 23 is widened radially outwards on its male side with its cutting edge 10 and on its female side with its cutting edge 11 whereby the riveted joint is formed. This is a known design of a riveted joint.
- Fig. 2b shows the riveted joint in accordance with Fig. 2a towards which the ram 18 moves.
- the ram 18 is preferably designed at its end face in the form of a truncated cone so penetration into the punched-out piece is facilitated.
- the ram can also be designed flat or concave at its end face.
- Fig. 2c it is shown how the ram 18 moves through the riveted joint and in so doing pushes out the punched-out piece 21 from the centre of the punch rivet. It is also possible to drill out the punched-out piece with a drill bit (see Fig. 5).
- Fig. 2d the beginning of the removal of the punch rivet 23 from the riveted joint is illustrated.
- the forward movement spindle 30 with the threaded mandrel 20 arranged thereon is inserted in the punch rivet in a centred manner and is screwed by rotation into the inner surface of the punch rivet 23.
- the thread of the threaded mandrel 20 cuts into the inner surface of the punch rivet during the rotation process and forms an interlocking and non-positive fit with it.
- Fig. 2e shows the punch rivet 23 located on the threaded mandrel 20 and the two sheets 12 and 13 now separated.
- Fig. 3 shows an enlarged view of the threaded mandrel 20 in its interlocking and non-positive fit with the punch rivet 23.
- Fig. 4 shows another embodiment of the present invention in which the threaded mandrel 20 is provided with a ram 200 with which the punched-out piece is expelled from the punch rivet.
- Fig. 5 shows a further embodiment of the threaded mandrel 20 according to the invention which has a drill bit 300 in order to drill out the punched-out piece from the punch rivet.
- Fig. 6 shows a device according to the invention for withdrawing a punch rivet.
- the device 60 according to the invention has a measuring device 50 which is arranged in such a way that rotational and pulling movements of the clamping jaws 25 or of the forward movement spindle 30 can be measured in order to convey information about the movement performed by the threaded mandrel 20 in each case.
- a control circuit is produced between the measuring device 50 and the drive of the device 60 according to the invention which is not illustrated, which control circuit optionally supplies processing data from the device 60 according to the invention via additional sensors and therefore can ensure reliable and precise removal of punch rivets.
- Fig. 7 shows the device according to the invention in accordance with Fig. 6, the ram 200 being arranged on the tip of the threaded mandrel.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Insertion Pins And Rivets (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
- Automatic Assembly (AREA)
Abstract
Description
Claims (8)
- Process for removing punch rivets (7) set in a workpiece (12,13) which are tubular and axisymmetric in design, characterised in that upon setting of the punch rivet (7), a punched-out piece (21) remaining therein is removed by a tool (18) and thereafter a threaded mandrel (20) is screwed into the punch rivet (7) with simultaneous formation of a substantially continuous distinctive thread, which threaded mandrel upon its subsequent withdrawal counter to the pressure of an abutment (22) resting on the workpiece (12,13) withdraws the punch rivet (7) from the workpiece (12,13).
- Process according to claim 1, characterised in that the tool (18) designed as a ram expels the punched-out piece (21) from the punch rivet (7).
- Process according to claim 1, characterised in that the tool (18) designed as a drill bit drills out the punched-out piece (21) from the punch rivet (7).
- Device for carrying out the process according to one of claims 1 to 3, characterised by a drive device provided with a clamping chuck (25) for clamping the threaded mandrel (20) which rotates the clamping chuck (25) with forward movement and is switched to backward movement, abutments (22) which surround the drive device being associated therewith.
- Device according to claim 4 or 5, characterised in that the threaded mandrel (200) is provided with a ram at its free end.
- Device according to claim 4, characterised in that the threaded mandrel (300) is provided at its free end with a drill bit.
- Device according to one of claims 4 to 6, characterised in that a sensor (50) is coupled to the drive device, which sensor measures the forward movement of a forward movement spindle (30) and after an adjustable forward movement stops the rotation of the forward movement spindle (30) and switches it to backward movement.
- Device according to one of claims 4 to 7, characterised in that the threaded mandrel (20) is composed of hardened steel.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000112845 DE10012845A1 (en) | 2000-03-16 | 2000-03-16 | Method and device for removing punch rivets from a workpiece |
DE10012845 | 2000-03-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1136155A2 true EP1136155A2 (en) | 2001-09-26 |
EP1136155A3 EP1136155A3 (en) | 2002-02-06 |
Family
ID=7634968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01302304A Withdrawn EP1136155A3 (en) | 2000-03-16 | 2001-03-13 | Process and device for removing punch rivets from a workpiece |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1136155A3 (en) |
JP (1) | JP2001293536A (en) |
DE (1) | DE10012845A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1645358A2 (en) * | 2004-10-07 | 2006-04-12 | Textron, Inc. | Performance enhancing repair tool |
WO2015017942A1 (en) * | 2013-08-08 | 2015-02-12 | Bossard Ag | Method for connecting multiple panel-shaped material portions using a hollow rivet |
WO2016036253A1 (en) * | 2014-09-02 | 2016-03-10 | Aker Subsea As | Torque interface removal tool |
CN106181856A (en) * | 2016-07-11 | 2016-12-07 | 徐州徐工基础工程机械有限公司 | A kind of dismounting hinge pin method |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4533703B2 (en) * | 2004-08-26 | 2010-09-01 | 株式会社リコー | How to remove blind rivets |
US7555820B2 (en) * | 2005-01-24 | 2009-07-07 | The Boeing Company | Methods for removing blind fasteners |
GB2426802B (en) * | 2005-05-31 | 2008-07-16 | Newfrey Llc | A blind rivet, removal system and removal method |
JP5436617B2 (en) * | 2012-06-04 | 2014-03-05 | 日本車輌製造株式会社 | How to remove rivets |
JP2019010694A (en) * | 2017-06-29 | 2019-01-24 | 豊田鉄工株式会社 | Blind nut dismount tool and blind nut dismount structure |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5722144A (en) * | 1993-06-17 | 1998-03-03 | Audi Ag | Device and process for repairing and connecting vehicle body elements of a light alloy |
EP0885672A2 (en) * | 1997-06-19 | 1998-12-23 | Emhart Inc. | Method of removing punch rivets set into a workpiece |
DE20010941U1 (en) * | 2000-06-20 | 2000-09-28 | Thiele Hartmut | Device for loosening hollow rivets |
-
2000
- 2000-03-16 DE DE2000112845 patent/DE10012845A1/en not_active Withdrawn
-
2001
- 2001-03-13 EP EP01302304A patent/EP1136155A3/en not_active Withdrawn
- 2001-03-16 JP JP2001075556A patent/JP2001293536A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5722144A (en) * | 1993-06-17 | 1998-03-03 | Audi Ag | Device and process for repairing and connecting vehicle body elements of a light alloy |
EP0885672A2 (en) * | 1997-06-19 | 1998-12-23 | Emhart Inc. | Method of removing punch rivets set into a workpiece |
DE20010941U1 (en) * | 2000-06-20 | 2000-09-28 | Thiele Hartmut | Device for loosening hollow rivets |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1645358A2 (en) * | 2004-10-07 | 2006-04-12 | Textron, Inc. | Performance enhancing repair tool |
EP1645358A3 (en) * | 2004-10-07 | 2006-12-06 | Textron, Inc. | Performance enhancing repair tool |
WO2015017942A1 (en) * | 2013-08-08 | 2015-02-12 | Bossard Ag | Method for connecting multiple panel-shaped material portions using a hollow rivet |
WO2016036253A1 (en) * | 2014-09-02 | 2016-03-10 | Aker Subsea As | Torque interface removal tool |
CN106181856A (en) * | 2016-07-11 | 2016-12-07 | 徐州徐工基础工程机械有限公司 | A kind of dismounting hinge pin method |
CN106181856B (en) * | 2016-07-11 | 2017-12-12 | 徐州徐工基础工程机械有限公司 | A kind of dismounting hinge pin method |
Also Published As
Publication number | Publication date |
---|---|
JP2001293536A (en) | 2001-10-23 |
EP1136155A3 (en) | 2002-02-06 |
DE10012845A1 (en) | 2001-09-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1136155A2 (en) | Process and device for removing punch rivets from a workpiece | |
JP2002086245A (en) | Forging method and forging apparatus | |
EP0677665B1 (en) | Rivet | |
JP2014233749A (en) | Drilling device | |
US20040247414A1 (en) | Self-drilling pull-through blind rivet and methods of and apparatus for the assembly and setting thereof | |
JP7451852B2 (en) | How to tighten rivets | |
US2391396A (en) | Drill | |
TWI246453B (en) | Knockout punch with pilot hole locator | |
US4403417A (en) | Draw punch | |
US6568062B1 (en) | Methods of removing self-piercing rivets set into a workpiece and devices for implementing the methods | |
PT1380760E (en) | Self piercing rivet | |
EP2985093B1 (en) | Blind riveting apparatus and method for setting a blind rivet | |
US2688185A (en) | Swaged fastener removal tool | |
US20060093448A1 (en) | Drills | |
JPH04189407A (en) | Shank for annular drilling edge | |
US20070003389A1 (en) | Blind rivet, removal system and related method | |
US2069231A (en) | Hand punch | |
JP2020199508A (en) | Processing method and machine tool | |
USH419H (en) | Contoured punch tool for removing semi-tubular rivets | |
CN206216595U (en) | Plug-in type wedge point withdrawing drill bit mechanism | |
JPH0724617A (en) | Core drill | |
JPH0810869A (en) | Device for drilling long hole of hollow round tube | |
CN214601689U (en) | Deep hole forging piece perforation sheath and ejection die | |
CN215702305U (en) | Impact type manual hole puncher | |
JP4533703B2 (en) | How to remove blind rivets |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: EMHART LLC |
|
AKX | Designation fees paid |
Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NEWFREY LLC |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20020807 |