# US 10,371,190 B2 · Punch rivet and method for producing a punch-riveted joint > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,190 B2 - Document ID: US10371190B2 - Status: Granted - Kind: B2 - Application number: 15/674,904 - Filed: 2017-08-11 - Published: 2017-11-30 - Granted: 2019-08-06 - Earliest claimed: 2015-02-11 - Assignees: Newfrey LLC - Applicants: Newfrey LLC - Inventors: Matthias Wissling; Frank Wilhelm; Paul Bartig; Paul Hez - Web page: https://patentgrep.com/patent/US10371190B2 ## CPC - F16B 19/086: {Self-piercing rivets} - B21J 15/025: {Setting self-piercing rivets} - B21J 15/04: Riveting hollow rivets mechanically - B21J 15/36: Rivet sets, i.e. tools for forming heads; Mandrels for expanding parts of hollow rivets - F16B 19/10: fastened by expanding mechanically - F16B 19/08: Hollow rivets; Multi-part rivets - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) - B21J: FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES (rolling of metal B21B; making particular products by forging or pressing B21K; cladding or plating B23K; finishing surfaces by hammering B23P9/04; compacting surfaces by blasting with particulate material B24C1/10; general features of presses, presses for consolidating scrap B30B; furnaces in general F27) ## Abstract A punch rivet for joining two workpieces, has a head and a shank. The shank is a hollow shank with a shank internal diameter (D3), a shank external diameter (D1) and a shank end face. On the shank end face is a ring cutting edge with the diameter (D4) that is smaller than the shank external diameter (D1) but greater than the shank internal diameter (D3). The ring cutting edge is radially spaced both from the shank external diameter (D1) and from the shank internal diameter (D3) by at least 20% of the radial shank wall thickness (M5). And the ratio D3/D1 of shank internal diameter D3 to shank external diameter D1 is smaller than 0.6. ## Claims ### Claim 1 A punch rivet for joining two workpieces, the punch rivet comprising: a head; a hollow shank extending axially from the head with a shank internal diameter (D3), a shank external diameter (D1), a radial shank wall thickness (M5), an axial shank end face distal from the head, and a ring cutting edge located on the shank end face, and the ring cutting edge defines a cutting edge diameter (D4) which is smaller than the shank external diameter (D1) and greater than the shank internal diameter (D3), and the ring cutting edge is radially spaced by at least 20% of the radial shank wall thickness (M5) both from the shank external diameter (D1) and from the shank internal diameter (D3), and wherein the ring cutting edge defines a cutting ring surface width (M3) which is smaller than 10% of the radial shank wall thickness (M5); a ratio (D3/D1) of shank internal diameter (D3) to shank external diameter (D1) is smaller than 0.6; and the ring cutting edge merges into the shank internal diameter (D3) by a profile which defines a cutting radius (R2) and a ratio (R2/D1) of cutting radius (R2) to shank external diameter (D1) is smaller than 0.3. ### Claim 2 (depends on 1) The punch rivet according to claim 1, wherein the profile with the cutting radius (R2) adjoins the ring cutting edge and merges tangentially into the shank internal diameter (D3), and a ratio (M2/D1) of cutting portion height (M2) to shank external diameter (D1) is smaller than or equal to 0.25. ### Claim 3 (depends on 1) The punch rivet according to claim 1, wherein the profile with the cutting radius (R2) adjoins the ring cutting edge and merges tangentially into an inner conical surface axially between the profile and the shank internal diameter (D3). ### Claim 4 (depends on 3) The punch rivet according to claim 3, wherein the inner conical surface defines an opening angle (α2) which is smaller than 50°. ### Claim 5 (depends on 1) The punch rivet according to claim 1, wherein the profile which defines a cutting radius (R2) is adjacent to the shank internal diameter (D3) and merges tangentially into an inner conical surface axially between the profile and the ring cutting edge. ### Claim 6 (depends on 5) The punch rivet according to claim 5, wherein the inner conical surface defines an opening angle (α2) which is greater than 55°. ### Claim 7 (depends on 1) The punch rivet according to claim 1, wherein the profile which defines the cutting radius (R2) is located axially between a first inner conical surface adjoining the ring cutting edge and a second inner conical surface adjoining the shank internal diameter. ### Claim 8 (depends on 1) The punch rivet according to claim 1, wherein the shank external diameter (D1) merges into an external circumference of the head by a second profile, which defines an underhead radius (R1), and a head cone, and the ratio (R1/D1) of the underhead radius (R1) to the shank external diameter (D1) is smaller than 0.13. ### Claim 9 (depends on 1) The punch rivet according to claim 1, wherein the ring cutting edge merges into the shank external diameter (D1) by a shank external bevel which defines at least one of a bevel angle (α1) smaller than 40° with reference to a radial plane and an axial external bevel height (M4) smaller than or equal to 0.3 mm. ### Claim 10 A method for producing a punch-riveted joint between a first workpiece and a second workpiece, the second workpiece made of a high-strength material with a strength of at least 600 MPa and a thickness where joined of at least 0.5 mm, wherein the method comprises the steps of: arranging the workpieces so that one of either the first workpiece or the second workpiece is an upper workpiece; providing a punch rivet comprising: a head; a hollow shank extending axially from the head with a shank internal diameter (D3), a shank external diameter (D1), a radial shank wall thickness (M5), an axial shank end face distal from the head, and a ring cutting edge located on the shank end face, and the ring cutting edge defines a cutting edge diameter (D4) which is smaller than the shank external diameter (D1) and greater than the shank internal diameter (D3), and the ring cutting edge is radially spaced by at least 20% of the radial shank wall thickness (M5) both from the shank external diameter (D1) and from the shank internal diameter (D3), and wherein the ring cutting edge defines a cutting ring surface width (M3) which is smaller than 10% of the radial shank wall thickness (M5); a ratio (D3/D1) of shank internal diameter (D3) to shank external diameter (D1) is smaller than 0.6; and the ring cutting edge merges into the shank internal diameter (D3) by a profile which defines a cutting radius (R2) and a ratio (R2/D1) of cutting radius (R2) to shank external diameter (D1) is smaller than 0.3; and carrying out a punch riveting operation, wherein the upper workpiece is pierced. ### Claim 11 A punch rivet for joining two workpieces, the punch rivet comprising: a head; a hollow shank extending axially from the head with a shank internal diameter (D3), a shank external diameter (D1), a radial shank wall thickness (M5), an axial shank end face distal from the head, and a ring cutting edge located on the shank end face, and the ring cutting edge defines a cutting edge diameter (D4) which is smaller than the shank external diameter (D1) and greater than the shank internal diameter (D3), and the ring cutting edge is radially spaced by at least 20% of the radial shank wall thickness (M5) both from the shank external diameter (D1) and from the shank internal diameter (D3), and wherein the ring cutting edge defines a cutting ring surface width (M3) which is smaller than 10% of the radial shank wall thickness (M5); a ratio (D3/D1) of shank internal diameter (D3) to shank external diameter (D1) is smaller than 0.6; and the ring cutting edge merges into the shank external diameter (D1) by a shank external bevel which defines at least one of a bevel angle (α1) smaller than 40° with reference to a radial plane, and an axial external bevel height (M4) smaller than or equal to 0.3 mm. ### Claim 12 (depends on 11) The punch rivet according to claim 11, wherein the ring cutting edge merges into the shank internal diameter (D3) by a profile which defines a cutting radius (R2) and a ratio (R2/D1) of cutting radius (R2) to shank external diameter (D1) is smaller than 0.3. ### Claim 13 (depends on 12) The punch rivet according to claim 12, wherein the profile with the cutting radius (R2) adjoins the ring cutting edge and merges tangentially into the shank internal diameter (D3), and a ratio (M2/D1) of cutting portion height (M2) to shank external diameter (D1) is smaller than or equal to 0.25. ### Claim 14 (depends on 12) The punch rivet according to claim 12, wherein the profile with the cutting radius (R2) adjoins the ring cutting edge and merges tangentially into an inner conical surface axially between the profile and the shank internal diameter (D3). ### Claim 15 (depends on 14) The punch rivet according to claim 14, wherein the inner conical surface defines an opening angle (α2) which is smaller than 50°. ### Claim 16 (depends on 12) The punch rivet according to claim 12, wherein the profile which defines a cutting radius (R2) is adjacent to the shank internal diameter (D3) and merges tangentially into an inner conical surface axially between the profile and the ring cutting edge. ### Claim 17 (depends on 16) The punch rivet according to claim 16, wherein the inner conical surface defines an opening angle (α2) which is greater than 55°. ### Claim 18 (depends on 12) The punch rivet according to claim 12, wherein the profile which defines the cutting radius (R2) is located axially between a first inner conical surface adjoining the ring cutting edge and a second inner conical surface adjoining the shank internal diameter. ### Claim 19 (depends on 11) The punch rivet according to claim 11, wherein the shank external diameter (D1) merges into an external circumference of the head by a second profile, which defines an underhead radius (R1), and a head cone, and the ratio (R1/D1) of the underhead radius (R1) to the shank external diameter (D1) is smaller than 0.13.