Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B37/00—Nuts or like thread-engaging members
  • F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
  • F16B37/06—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
  • F16B37/062—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting
  • F16B37/065—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting by deforming the material of the nut
  • F16B37/067—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting by deforming the material of the nut the material of the nut being deformed by a threaded member generating axial movement of the threaded part of the nut, e.g. blind rivet type
• • 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
• • 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
  • B21J15/04—Riveting hollow rivets mechanically
  • B21J15/043—Riveting hollow rivets mechanically by pulling a mandrel
• • 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
  • B21J15/10—Riveting machines
  • B21J15/36—Rivet sets, i.e. tools for forming heads; Mandrels for expanding parts of hollow rivets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
  • F16B19/04—Rivets; Spigots or the like fastened by riveting
  • F16B19/08—Hollow rivets; Multi-part rivets
  • F16B19/086—Self-piercing rivets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
  • F16B19/04—Rivets; Spigots or the like fastened by riveting
  • F16B19/08—Hollow rivets; Multi-part rivets
  • F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
  • F16B19/1027—Multi-part rivets
  • F16B19/1036—Blind rivets
  • F16B19/1045—Blind rivets fastened by a pull - mandrel or the like
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
  • F16B19/04—Rivets; Spigots or the like fastened by riveting
  • F16B19/08—Hollow rivets; Multi-part rivets
  • F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
  • F16B19/1027—Multi-part rivets
  • F16B19/1036—Blind rivets
  • F16B19/1045—Blind rivets fastened by a pull - mandrel or the like
  • F16B19/1072—Blind rivets fastened by a pull - mandrel or the like the pull-mandrel or the like comprising a thread and being rotated with respect to the rivet, thereby mechanically expanding and fastening the rivet
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49764—Method of mechanical manufacture with testing or indicating
  • Y10T29/49771—Quantitative measuring or gauging
  • Y10T29/49776—Pressure, force, or weight determining
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49833—Punching, piercing or reaming part by surface of second part
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49947—Assembling or joining by applying separate fastener
  • Y10T29/49954—Fastener deformed after application
  • Y10T29/49956—Riveting
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
  • Y10T29/5116—Plural diverse manufacturing apparatus including means for metal shaping or assembling forging and bending, cutting or punching
  • Y10T29/5118—Riveting
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/53—Means to assemble or disassemble
  • Y10T29/53039—Means to assemble or disassemble with control means energized in response to activator stimulated by condition sensor
  • Y10T29/53061—Responsive to work or work-related machine element
  • Y10T29/53065—Responsive to work or work-related machine element with means to fasten by deformation
  • Y10T29/5307—Self-piercing work part
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/53—Means to assemble or disassemble
  • Y10T29/5343—Means to drive self-piercing work part
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/53—Means to assemble or disassemble
  • Y10T29/53709—Overedge assembling means
  • Y10T29/5377—Riveter

Definitions

• the invention relates to a fastening element, in particular for blind riveting, with a setting head, a deformation section and a shaft end, as well as a method and a device for setting this fastening element, a die for punching, the rivet connection achieved with the method and with the device, and the use thereof riveting.
• blind rivets are characterized by the fact that the force required to set the blind rivet is not applied by force-absorbing brackets from both sides of a workpiece to be riveted, but the head or foot of the rivet by pulling on a mandrel that runs inside the blind rivet, are pressed together by holding the head on the workpiece and pulling the foot towards the head using the mandrel.
• blind rivet is that only one-sided access to the workpiece is required. Different designs for self-drilling blind rivets were developed, while it was not considered to create self-punching blind rivets, since the necessary deformability of the rivet shaft does not permit the application of force for punching.
• a disadvantage of the blind rivet is that holes have to be drilled or punched in the workpiece in order to place the blind rivet. This is particularly difficult when two workpieces are to be connected to one another, the workpieces still being movable relative to one another. The production of the holes in connection with the alignment of the workpieces can be difficult, so that the drilling and setting of the rivets must take place in a fixed relative position of the workpieces. Even with the self-drilling blind rivets, this problem occurs because during drilling two workpieces to be connected may have a small space between them and when the rivets are set the two workpieces are shifted against each other, so that the quality of the rivet connection suffers due to the shear forces.
• self-drilling blind rivets produce chips that can damage surfaces.
• self-punching rivets and also self-punching nuts and bolts are known. They do not have the problem of searching for holes or moving the workpieces against each other.
• a disadvantage of self-punching nuts is that only relatively small tensile forces and torques can be absorbed, since the nuts can be released from the workpiece relatively easily.
• these rivets and nuts are mostly processed in stationary systems, which makes this process relatively inflexible in relation to changes in position.
• a fundamentally new concept for a rivet element, a device and a method for setting a rivet element, for a rivet connection and for the use of this rivet connection are to be specified.
• the fastening element according to the invention in particular for blind riveting, with a hollow shaft, which has a setting head at its free end, with a deformation section for forming a closing head, and with a connecting section formed within the shaft, which, in particular, forms a tensile connection with a mandrel a mandrel base of a dome, has a punched edge which runs on the setting head opposite the shaft end essentially along the outermost circumference of the shaft.
• a fastening element according to the invention in particular for blind riveting, is also provided with a hollow shaft which has a setting head at its free end a deformation section for forming a closing head, with a mandrel inside the shaft, which has a mandrel head and a mandrel foot, the mandrel foot being at least tensile connected to a shaft end opposite the setting head, characterized in that the shaft end or the mandrel foot has a punched edge which runs essentially along the outermost circumference of the shaft or the mandrel foot. The punching forces are transmitted through the mandrel into the mandrel foot with the punching edge.
• the difference between this variant of the fastening element according to the invention and the variant mentioned first is that in the second variant the mandrel is part of the fastening element, while in the first variant the mandrel is part of the tool, in particular the setting device.
• the mandrel can be reused for further setting processes.
• the fastening element according to the invention is hollow on the inside, so that a mandrel can be pushed through the setting head and the deformation section in order to achieve an at least tensile connection between the mandrel foot and the shaft end.
• the punched edge is used to punch a punch hole in the workpiece while the fastener is being pushed through a workpiece.
• the force for punching must be transferred into the shaft end by means of the mandrel, since the deformation section cannot transmit this force. Due to a sharp punching edge, the punching forces that act on the workpiece are reduced. The formation of cracks in the vicinity of the punched punch hole is also avoided, which improves the quality of the riveted joint.
• the punched edge is a sharp, preferably substantially rectangular, edge.
• a rivet connection is achieved with the fastening element, which resembles a blind rivet connection because the closing head is formed by tensile forces.
• the deformation section is deformed by pulling the shaft end in the direction of the setting head with the aid of the mandrel which is inserted into the hollow shaft and with which a tensile connection is established with the connecting section.
• a closing head is formed by the deformation of the deformation section. For example, two workpieces can be connected to one another with the closing head.
• the deformation section is either made of softer material than the setting head or the shank end, or is made more easily deformable with the aid of a suitable shape, for example through thinner wall thicknesses and / or openings and / or folds in the deformation section.
• connections can be achieved with a blind rivet that can absorb higher tensile and shear forces.
• the punch riveting process requires ductile material on the die side, which also requires a certain minimum thickness. This is disadvantageous for mixed building structures.
• the advantage of the invention is combined with the further advantage that no pre-drilled holes have to be sought into which the fastening element is inserted.
• chips are avoided by drilling holes. The self-punching of the fastening element results in a hole reveal that brings about particularly advantageous properties of the rivet connection with regard to the maximum absorbable tensile and shear forces.
• the shaft and the mandrel in particular the mandrel foot and the shaft end, can be detachably connected.
• Advantages of a detachable connection include that components can be attached to the fastening element using the mandrel.
• a detachable connection also enables the mandrel to be used as a tool for forming the closing head.
• the shaft and the mandrel in particular the mandrel foot and the shaft end, can be non-positively connected.
• the shaft and the mandrel, in particular between the mandrel foot and the shaft end are positively connected to one another.
• the positive connection is established by a bayonet lock or a screw connection between the shaft and the mandrel.
• the mandrel foot has an external thread and the shaft end has a corresponding internal thread, into which the mandrel foot can be screwed.
• the mandrel foot is larger in diameter or equal to the outer diameter of the shaft end.
• the punched edge is advantageously formed on the mandrel foot. A sufficiently large punching hole is punched out through a punching edge on the mandrel foot.
• the mandrel has a predetermined breaking point. It is hereby achieved that on the one hand the punch hole required for the rivet connection can be punched, but on the other hand the mandrel can also be removed after the deformation of the deformation section.
• the setting head has a larger diameter than the deformation section, the shaft end and the mandrel foot. This ensures that on the one hand the fastening element is not pressed too deeply into or even through the workpiece, and on the other hand that the setting head can be held against the workpiece without difficulty if the shaft end is pulled in the direction of the setting head.
• the fastening element is advantageously made of metal, in particular steel, aluminum or an aluminum alloy.
• the cross section of the fastening element is essentially circular.
• the cross section of the fastening element is essentially polygonal. Due to a non-circular shape of the cross-section, an additional strength of a rivet connection between two workpieces against twisting is achieved. If an internal thread of the fastening element is used for fastening additional parts, the polygonal shape offers additional security against undesired rotation of the fastening element in the workpiece.
• the mandrel preferably has a mandrel head that is larger in diameter than the shaft end. With the aid of the mandrel, a required compressive force for punching the fastening element can also be absorbed.
• the fastening element is given the required strength by the mandrel, so that the fastening element can be punched into the workpiece.
• the mandrel can later be gripped and pulled back in a simple manner.
• the shaft end is open.
• the shaft end is closed. A comparatively tight rivet connection is produced by a closed shaft end, which makes it difficult for gases, liquids or solids to pass from one side of the workpiece to the other side of the workpiece.
• a method for setting a fastening element which has a hollow shaft which has a setting head at its free end, a deformation section for forming a closing head, and a connecting section which is formed within the shaft and which forms a tension-resistant connection with a mandrel, in particular with a mandrel base of a mandrel, the shaft end opposite the setting head being provided with a punched edge which runs essentially along the outermost circumference of the shaft, comprises the following method steps: the mandrel is introduced into the fastening element and a tension-resistant connection formed between the mandrel and the shaft; the punching process with the fastening element with the mandrel to form a punch hole in at least one workpiece is carried out; the shaft is inserted into the punch hole so that the shaft extends at least partially into the punch hole; a tensile force is applied to the mandrel and the setting head is held against to form the closing head.
• a method for setting a fastening element comprises a hollow shaft having a setting head at its free end, a deformation section for forming a closing head, and a mandrel inside the shaft, the mandrel including a mandrel head and a mandrel foot and the The mandrel foot is connected at least in a tensile manner to a shank end opposite the setting head, and the shank end or the mandrel foot has a punching edge which essentially runs along the outermost circumference of the shaft or the mandrel foot, the following method steps: A punching process is carried out with the fastening element and the mandrel performed to form a punch hole in at least one workpiece; the shaft is inserted into the punch hole so that the shaft extends at least partially into the punch hole; a tensile force is applied to the mandrel and the setting head is held against to form the closing head.
• the force required for punching the punch hole for the fastening element can be transmitted to the workpiece, and on the other hand with the aid of the mandrel the shaft end is pulled in the direction of the setting head.
• Protrudes part of the Deformation section on the back of the workpiece it is deformed by pulling on the mandrel, ie in particular widened. If the deformation section does not protrude on the back, but is located inside the workpiece, the deformation section is deformed inside the workpiece and, due to its widening, causes jamming, ie in particular a non-positive connection between the fastening element and the workpiece.
• the shaft end has an internal thread
• the internal thread can be arranged on the back of the workpiece, which leads to increased tensile stability.
• a plurality of workpieces can be connected to one another by the fastening element. Since the mandrel absorbs the necessary compressive or tensile forces, there is greater latitude in the dimensioning of the fastening element than in the known rivets. In particular, wall thicknesses can be reduced and rivets can be produced using less material.
• the mandrel can either be unscrewed or can be torn out using a predetermined breaking point on the mandrel.
• the thread can be used for attaching an additional part such as Cables, holders, cladding or housing parts are used. However, it can also simply be used to hold a cover plug.
• the mandrel is used as a tool for forming a closing head, in particular thus being part of a device for setting a fastening element, whereas in the second variant the mandrel is part of the Fastener as such is.
• At least two workpieces are connected to one another by the fastening element, punching being carried out by at least one workpiece.
• punching is carried out with the aid of the fastening element, which leads to a particularly good hold of the fastening element.
• Any additional parts and components can be attached to the fastening element.
• a plurality of workpieces are firmly connected to one another by the deformation of the deformation section.
• the mandrel is pressed into the workpiece with a predeterminable force and / or by a predeterminable path.
• the workpiece is held in place by a die, which largely prevents plastic deformation of the workpiece in the vicinity of the punched hole.
• the punching forces are transferred to the workpiece via the mandrel.
• the properties of the rivet connection are positively influenced with the aid of the predefinable force, in particular by specifying a suitable force curve and / or the predefinable path.
• a screw connection is formed between the mandrel and the fastening element.
• the mandrel belongs to the fastening element or to the device of a setting machine.
• the mandrel is inserted just before the fastener is set, e.g. screwed, and then the fastener is set using the mandrel. Finally, the mandrel is removed from the fastener set, in particular unscrewed.
• the connection between the mandrel and the fastening element can also be released and / or established after the closing head has been formed. That the attached fastener can e.g. can be used as a threaded hole for attaching objects.
• a riveted joint according to the invention is characterized in that it uses a method with the above. Features is made. Such rivet connections are characterized by a particularly good hole reveal.
• the mandrel which is designed as a screw, is screwed into the internal thread and projects beyond the setting head.
• the mandrel can be gripped in a simple manner.
• a device for placing a fastening element in at least one workpiece, in particular for carrying out the method according to the invention, preferably for setting a fastening element according to the invention, has a die, a stamp which contains a mandrel which can be releasably connected to a fastening element, and a holding tool for holding the setting head against the workpiece, the punch and the holding tool being able to move in a defined manner in the direction of and away from the die, independently of one another.
• a stamp for punching the fastening element through the at least one workpiece a holding tool for holding the Set head against the workpiece, and a pulling tool for withdrawing the mandrel, the punch and the holding tool in the direction of and away from the die are independently movable in a defined manner.
• the deformation section is deformed to form a closing head.
• a particularly intimate contact between the two pieces is achieved and gaps are avoided, so that a particularly good quality of the riveted connection is achieved.
• the mandrel has an external thread for producing a releasable connection with the fastening element. This is particularly important if the mandrel as part of the device for setting a fastening element according to the first variant of the device according to the invention is always reused. If the mandrel is part of the device, the fastener requires less material and is lighter.
• the device according to the invention has a disposal channel in the die for the disposal of stamped parts. With the help of the disposal channel, punched out parts are easily transported away from the workpiece and disposed of.
• the punch and the die are connected with a counter-force connection structure, also called a C-bracket, for the frictional connection.
• the counterforce structure absorbs the forces that occur during the punching and prevents lateral displacement of the at least one workpiece. This significantly increases the precision when setting the fastener.
• means for moving and / or means for determining the position of the punch and / or the holding tool and / or force sensors for detecting the forces occurring when the rivets are set available.
• the workpiece thickness and the length of the fastening element to be set are checked with the aid of the position determination means.
• the means for moving allow the fastening element to be set, in particular punching and deforming the deformation section.
• the force sensors are used to check how strongly at least two workpieces are pressed together or the force with which the deformation section is deformed. Knowledge of the forces used and appropriate control of the means for moving with the aid of the means for determining the position allows the rivet connection to be optimized.
• the use according to the invention of a rivet connection according to the invention is for the detachable attachment of additional parts, in particular of lines, holders, cladding or housing parts to a workpiece.
• the rivet connection according to the invention thus has two tasks: on the one hand it allows the connection of at least two workpieces to one another, and on the other hand it allows the attachment of additional parts to workpieces.
• the die according to the invention with a punch opening which is variable in diameter for placing a fastening element in at least one workpiece in particular for carrying out the method according to the invention, preferably for setting the fastening element according to the invention, in particular using the device according to the invention, has at least two segments for absorbing punching forces , wherein the segments form a punching opening, which can be widened in diameter to accommodate a closing head of the fastening element, the segments being movably mounted in a die holder and the segments being held together by at least one spring element.
• the widenable punch opening provides sufficient space for the formation of a closing head while pulling on the mandrel and holding the setting head.
• the closing head presses the segments radially outwards, so that the punch opening automatically increases in diameter.
• the die can be used as a stop for the workpiece after the punching process, when the closing head is formed.
• the die does not need to be removed after the punching process in order to make room for the closing head. This is particularly important if several workpieces are to be connected to one another and it is to be ensured that the workpieces do not move against one another.
• the matrix according to the invention ze, it is possible to keep two workpieces to be joined together under constant pressure during the entire setting process of the fastening element, thereby improving the embrasure of the rivet connection.
• the die Due to the mobility of the segment, the die becomes floating, i.e. with lateral offset of the fastening element and die e.g. due to bending of the C-bracket or tolerances of the fastening element, there are no grinding marks or scraping on the circumference of the fastening element.
• the fastener is protected from corrosion and the die from wear.
• the segments are held together with the aid of the spring element, so that the segments return automatically to the original position after the fastening element has been set.
• the die according to the invention is hereby restored to its original state.
• the segments are shaped so that on the one hand they can absorb large forces in the punching direction without becoming laterally unstable and e.g. to slip away, but on the other hand can be opened in a simple manner by radial forces pointing away from the punch opening, which are generated by the formation of a closing head.
• the segments can be moved radially.
• a radial displacement of the segments makes the die particularly easy to open.
• the segments are shaped or supported with an axis in such a way that the segments perform a rotary or a tilting movement.
• the segments have an essentially flat contact surface and the die holder has a substantially flat counter surface for transferring the punching forces to the die holder. Due to the flat surfaces, large punching forces can be absorbed by the segments and forwarded to the die holder, which ensures a stable position of the segments during the punching process.
• the segments have
• Spring element receptacles A spring element is guided in the spring element receptacles. This enables the segments to move to their original position and be available for a new setting process.
• the die according to the invention advantageously has a die holder which contains a ring stop.
• the ring stop With the help of the ring stop, the workpiece to be fastened is held firmly during the setting process, which in particular ensures that lateral movement of the workpiece is avoided.
• the ring stop prevents the segments from moving sideways. The ring stop thus ensures that the object is held securely during the setting process.
• the ring stop has a ring stop surface to ensure the mobility of the segments during the setting process of the fastening element, and the segments have a segment stop surface, the segment stop surface with respect to the workpiece by a distance of 0.1 to 0.3 mm, preferably from 0.15 to 0.25 mm, lies behind the ring stop surface.
• the die has fewer than 5, in particular 4, preferably 3, segments.
• the spring element is formed by a rubber ring. The spring element ensures that the movable segments are automatically returned to their original position after completion of the setting process of a fastening element.
• the spring element is a spiral ring.
• the die according to the invention has a transverse supply air hole with which punched-out stamped parts can be removed through a disposal channel with the aid of compressed air.
• the punching opening formed by the segments is rotationally asymmetrical in cross section.
• the punching opening is advantageously essentially polygonal in cross section.
• the segments are formed with teeth so that the punch opening has a toothing in cross section.
• a corresponding rotationally asymmetrical punching hole is formed, against which the fastening element, even if it is designed to be rotationally symmetrical as such, clings to during its deformation.
• a non-rotatable connection is achieved by connecting the fastening element to the rotationally asymmetrical punch hole.
• Figure 1 shows a fastener according to the invention with a mandrel which is inserted into a workpiece.
• FIG. 2 shows a process sequence according to the invention, in which the fastening element, which contains a mandrel, is set by a device for placing a fastening element in a workpiece;
• Fig. 3 shows a riveted joint according to the invention, an additional part using the
• FIG. 4 shows a detail of a device according to the invention for setting a fastening element with a fastening element and a workpiece shortly before the fastening element is set;
• FIG. 5 shows an alternative embodiment of a fastening element according to the invention according to FIG. 1 with a mandrel which is inserted into a workpiece; 6 the predetermined breaking point of the mandrel in cross section; and
• FIG. 7 shows an alternative method sequence according to the invention, in which the fastening element is placed in a workpiece by a device for setting a fastening element, which has a mandrel;
• FIG. 8 shows a die according to the invention in cross section
• FIG. 9 shows a segment of the die according to the invention according to FIG. 8 in longitudinal section
• FIG. 10 shows the three segments of the die according to the invention from FIG. 8 in a top view
• FIG. 11 shows a die according to the invention with a rotationally asymmetrical punching opening in a top view
• FIG. 12 shows a die according to the invention with a further rotationally asymmetrical punching opening in a top view.
• FIG. 1 shows a fastening element 1 according to the invention with a setting head 4, a deformation section 2 and a shaft end 3 with an internal thread 5 and a punching edge 6, which is hollow and into which a mandrel 7 with a mandrel head 23 and a mandrel foot 24 is screwed.
• the tensile connection between the mandrel 7 and the shaft 27 is established by a connecting section 28.
• the connecting section 28 is formed by an internal thread 5 in the shaft 27.
• the internal thread 5 is screwed into an external thread 29 on the mandrel 7.
• the fastening element 1 is punched through a first workpiece 8 and a second workpiece 9, both workpieces 8, 9 being designed as sheets lying one on top of the other.
• the fastening element 1 punches its own punch hole 11 through the workpieces 8, 9.
• the shaft end 3 and part of the deformable section 2 are located on the rear side 10 of the second workpiece 9.
• the deformation section 2 has a smaller wall thickness than the shaft end 3.
• the mandrel 7 has a mandrel head 23 with which additional parts 22 (not shown) can be fastened and with which the mandrel 7 can be pulled in the direction of the setting head 4.
• the setting head 4 lies firmly on the first workpiece 8.
• FIG. 2 describes a process sequence for setting a fastening element according to the invention.
• a mandrel 7 is screwed into the fastening element 1 according to the invention held by a holding tool 13.
• the fastening element 1 With the aid of means for moving 19, the fastening element 1 is placed on a first workpiece 8 which is to be connected to a second workpiece 9. The position of the fastening element 1 relative to the workpieces 8, 9 is detected using means for determining the position 19.
• the workpieces 8, 9 are first placed on a die 14 which has a disposal channel 17 for punched-out stamped parts 18.
• the fastening element 1 is then placed on the first workpiece 8 with the aid of the holding tool 13 such that the shaft end 3 of the fastening element 1 contacts the first workpiece.
• a force is then exerted on the mandrel 7 with the aid of a stamp 12, so that the shaft end 3 is pushed through the workpieces 8, 9.
• both the holding tool 13 and a pulling tool 15 are carried along with the movement of the stamp 12. Punched-out stamped parts 18 fall into the disposal channel 17, where they are then disposed of, preferably with the aid of an overpressure or underpressure air line.
• the die 14 is then removed from the workpieces 8, 9, so that the shaft end or the protruding deformation section is free.
• the pulling tool 15 then pulls on the mandrel 1, the holding tool 13 pressing the setting head against the first workpiece 8.
• the deformation section 2 is deformed by the pulling, whereas the shaft end 3 is not plastically deformed.
• the pulling and punching are monitored and the movement of the pulling and / or holding tool is controlled with the data recorded by the force sensors 21.
• the mandrel 7 can be unscrewed from the fastening element 1 or an additional part can be fastened with it.
• FIG. 3 shows a riveted joint produced in the manner described, the fastening element 1 being deformed in its deformation section 2.
• an additional part 22, which can be a holder is attached to the workpieces 8, 9.
• the workpieces 8, 9 are firmly clamped between the setting head 4 and the deformation section 2.
• FIG. 4 shows a detailed view of the device for setting the fastening element 1.
• the fastening element 1 is held on the mandrel 7 screwed into the fastening element 1 with the aid of the holding tool 13.
• the traction tool 15 grips the mandrel 7 on its mandrel head 23.
• the punch 12 presses on the mandrel head 23 of the mandrel 7.
• the workpieces 8, 9 are arranged between the fastening element 1 and the die 14, the die 14 receives from the back 10 of the second workpiece 9 the force which is transmitted from the punch 12 via the mandrel 7 to the workpieces 8, 9.
• FIG. 5 shows an alternative embodiment of the fastening element 1 according to the invention according to FIG. 1 with a mandrel 7 which is inserted into two workpieces 8, 9.
• the punching hole 11 was punched into the workpieces 8, 9 with the punching edge 6, which is formed on the mandrel foot 24.
• the mandrel head 23 With the aid of the mandrel head 23, the mandrel 7 can be withdrawn, so that the deformation section 2 is first deformed and then the mandrel head 23 tears off the mandrel foot 24 at a predetermined breaking point 25.
• the punched edge 6 is formed by a sharp, essentially rectangular edge of the mandrel foot 24.
• the tensile connection between the mandrel 7 and the shaft 7 is established by the connecting section 28.
• FIG. 6 shows the predetermined breaking point 25 of the mandrel 7 in cross section, in which the mandrel 7 is tapered onto a square mandrel core 31 with webs 26 at the respective corners.
• the webs 26 contribute to the guidance of the mandrel 7 in the fastening element 1 and prevent the mandrel 7 from swinging or buckling to the side under the action of the compressive forces during the punching process.
• FIG. 7 describes an alternative method sequence according to the invention for setting a fastening element according to the invention.
• a mandrel 7 is firmly connected to a stamp 12 as part of the setting machine.
• the mandrel 7 has a mandrel foot 24 with which the mandrel 7 is screwed into the fastening element 1.
• the fastening element 1 has a setting head 4 and a shaft end 3, the shaft end 3 being provided with a punched edge 6.
• the mandrel 7 is screwed into the fastening element 1.
• the punching process is then carried out. In this case, the punched edge 6 punches a punched hole into the workpiece 8, 9 through the force of the mandrel 7.
• the die 14 absorbs the forces that occur in this process.
• the deformation section 2 is then deformed by pulling back the mandrel 7 and holding down the setting head 4.
• a closing head 30 is formed.
• the mandrel 7 is unscrewed from the fastening element 1 and is
• the die 14 has a die holder 41 which absorbs the punching forces via movable segments 34.
• the movable segments 34 are held together with the aid of a spring element 33.
• the movable segments 34 open automatically when a closing head (not shown) is trained. The closing head pushes the segments 34 apart against the force of the spring element 33.
• the segments 34 each have a contact surface 35 which rests on the die holder 41.
• the segments 34 also have a segment stop surface 43, via which the punching forces are transmitted to the segments 34 and via the contact surface 35 to the die holder 41.
• the die holder 41 contains a ring stop 42 which surrounds the segments 34.
• the ring stop 42 has a ring stop surface 44 with which a workpiece (not shown) is held.
• the workpiece is held securely by the ring stop surface 44, since the segment stop surface 43 is arranged further away with respect to the workpiece.
• the distance A between the segment stop surface 43 and the ring stop surface 44 is approximately 0.2 mm.
• the segments 34 form a punch opening 40 through which a punch part (not shown) can be pressed.
• a threaded connection 37 enables a disposal hose (not shown) to be easily attached to the disposal channel 17.
• the die holder 41 is attached to a counterforce structure, e.g. attached to a C-bracket (not shown).
• FIG. 9 shows a single segment 34 of a die 14 according to the invention according to FIG. 8 in longitudinal section.
• the segment 34 has a segment stop surface 43 and a contact surface 35.
• the support surface 35 is flat, so that punching forces can be transmitted to the die holder 41 in a safe manner via the segment stop surface 43 and via the support surface 35 without the segment 34 moving radially away from the punch opening 40 laterally.
• the segment 34 has a spring element receptacle 36, in which a spring element 33 is guided.
• the spring element 33 is made of rubber as an O-ring. Due to the shape of the segment 34, it is not necessary to support the individual segment 34 with the aid of an axis.
• each segment 34 can be moved radially and does not need to be tilted.
• each segment 34 can be supported with the aid of an axis (not shown), each segment 34 being tilted about a pivot point when the die 14 is opened.
• FIG. 10 shows the three segments 34 from FIG. 8 in a top view. It can be seen that the three segments 34 form a ring which permits the absorption of punching forces.
• the punch opening 40 has a diameter D which is somewhat larger than the diameter of the fastening element to be set (not shown).
• the segments 34 are held together with the aid of a spring element 33. When a closing head is formed at the end of the setting process, the segments 34 are pressed apart, so that gaps form between them, which increases the diameter D of the punch opening 40.
• FIG 11 shows a top view of a die 14 according to the invention with a rotationally asymmetrical punch opening 40.
• the segments 34 form offsets 45, which prevent the fastening element 1 from rotating in the workpiece 8, 9. This twist protection is particularly advantageous for punch nuts.
• FIG. 12 shows a top view of a die 14 according to the invention with a further rotationally asymmetrical punch opening 40, the rotational asymmetry being caused by teeth 46 in the respective segments 34.
• the invention describes a fastening element 1, in particular for blind riveting, with a setting head 4, a deformation section 2 and a shaft end 3, the deformation section 2 being arranged between the setting head 4 and the shaft end 3 and the fastening element 1 being hollow on the inside, optionally with a mandrel 7 within the fastening element 1, which has a mandrel head 23 and a mandrel foot 24 which is connected to the shaft end 3 at least in a tensile manner, the shaft end 3 or the mandrel foot 24 having a punched edge 6 which extends essentially along the outermost circumference of the shaft end 3 or the mandrel foot 24 runs, as well as a method for setting this fastening element 1, a rivet connection with this fastening element 1, a device for setting this fastening element 1, a use of the rivet connection achieved and a die suitable for the method for setting the fastening element.
• the invention is characterized in that particularly durable and tensile self-piercing blind rivet connections can be produced in
• Disposal channel 44 ring stop surface

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Insertion Pins And Rivets (AREA)
• Dowels (AREA)
• Connection Of Plates (AREA)

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Applications Claiming Priority (6)

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• 2002
  • 2002-03-01 EP EP02717987A patent/EP1366304A2/de not_active Withdrawn
  • 2002-03-01 JP JP2002572274A patent/JP4071634B2/ja not_active Expired - Fee Related
  • 2002-03-01 WO PCT/DE2002/000764 patent/WO2002073045A2/de not_active Ceased
• 2003
  • 2003-09-08 US US10/657,411 patent/US7040006B2/en not_active Ceased
• 2006
  • 2006-05-09 US US11/431,113 patent/US7596858B2/en not_active Expired - Fee Related
• 2008
  • 2008-04-25 US US12/150,344 patent/USRE41258E1/en not_active Expired - Fee Related

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