# US 2019/0168276 A1 · Die-pressing punch capable of adjusting initial load of coil spring in accordance with material of workpiece, die-pressing die set, and beveling method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168276 A1 - Document ID: US20190168276A1 - Status: Published application - Kind: A1 - Application number: 16/321,248 - Filed: 2017-07-27 - Published: 2019-06-06 - Earliest claimed: 2016-08-05 - Assignees: Amada Holdings Co., Ltd. - Applicants: Amada Holdings Co., Ltd. - Inventors: Yasuyuki OTSUKA - Web page: https://patentgrep.com/patent/US20190168276A1 ## CPC - B21D 19/00: Flanging or other edge treatment, e.g. of tubes (connecting by making use of folds B21D39/00; flaring-out tube ends B21D41/02) - B21C 51/00: Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F - B21D 19/005: {Edge deburring or smoothing} - B21D 22/02: Stamping using rigid devices or tools - B21D 28/00: Shaping by press-cutting; Perforating - B21D 28/34: Perforating tools; Die holders - B21D 28/36: using rotatable work or tool holders - B21D 28/265: {with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template} - B21D 28/346: {length adjustable perforating tools} - B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F) - B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL ## Abstract A die-pressing punch used for die-pressing a workpiece includes a punch guide, a punch body that is provided vertically movably and non-rotatable about its axial center with respect to the punch guide, a punch head screw-fitted with the punch head. The die-pressing punch further includes a roller unit that is provided inside the punch guide beneath the punch body vertically movably and has a rotatable roller protruding downward from a bottom face of the punch guide, and an urging member that is provided between the punch body and the roller unit and urges the roller unit downward. The die-pressing punch further includes a joint member that is jointed with the punch head non-rotatably about the axial center, and an operable member. The operable member switches. joint member between a rotatable state and a non-rotatable state about the axial center with revect to the punch guide. ## Claims ### Claim at position 1 1-15. (canceled) ### Claim 16 A die-pressing punch used for die-pressing a workpiece, the die-pressing punch comprising: a hollow cylindrical punch guide; a punch body provided inside the punch guide vertically movably and non-rotatable about an axial center thereof with respect to the punch guide; a punch head provided at an upper end of the punch body by being screw-fitted therewith; a roller unit provided inside the punch guide beneath the punch body vertically movably and having a rotatable roller protruding downward from a bottom face of the punch guide; an urging member provided inside the punch guide between the punch body and the roller unit and urging the roller unit downward; a ring-shaped joint member provided on a side of an outer circumferential surface of the punch body and on an upper side of the punch guide and jointed with the punch head non-rotatably about the axial center; and an operable member for switching the joint member between a rotatable state and a non-rotatable state about the axial center with respect to the punch guide, wherein an initial load of the urging member is adjusted by adjusting and then fixing a height position of the punch body with respect to the punch guide to change an initially-compressed amount of the urging member. ### Claim 17 (depends on 16) The die-pressing punch according to claim 16, wherein a plurality of engagement depressed portions depressed toward an outer side in a radial direction are formed on an inner circumferential surface of an upper end portion of the punch guide or on an inner circumferential surface of the joint member at intervals along a circumferential direction, and the operable member is provided on the joint member or at the upper end portion of the punch guide movably in the radial direction and has a hook portion capable of engaging with the engagement depressed portions. ### Claim 18 (depends on 17) The die-pressing punch according to claim 17, wherein the operable member disengages the hook portion from the engagement depressed portion by an pressing operation thereof to turn the joint member into the rotatable state about the axial center with respect to the punch guide, and engages the hook portion with any of the engagement depressed portions when the pressing operation is released to turn the joint member into the non-rotatable state about the axial center with respect to the punch guide. ### Claim 19 (depends on 16) The die-pressing punch according to claim 16, further comprising a stripper spring provided between the punch head and the joint member on the side of the outer circumferential surface of the punch body for keeping a distance between the punch head and the punch guide in a vertical direction. ### Claim 20 A die-pressing punch used for die-pressing a workpiece, the die-pressing punch comprising: a hollow cylindrical punch guide; a punch body provided inside the punch guide vertically movably and non-rotatable about an axial center thereof with respect to the punch guide; a punch head provided at an upper end of the punch body by being screw-fitted therewith; a roller unit provided inside the punch guide beneath the punch body vertically movably and having a rotatable roller protruding downward from a bottom face of the punch guide; an urging member provided inside the punch guide between the punch body and the roller unit and urging the roller unit downward; a ring-shaped joint member provided on a side of an outer circumferential surface of the punch body and on an upper side of the punch guide and jointed with the punch head non-rotatably about the axial center; and an operable member for switching the joint member between a rotatable state and a non-rotatable state about the axial center with respect to the joint member, wherein an initial load of the urging member is adjusted by adjusting and then fixing a height position of the punch body with respect to the punch guide to change an initially-compressed amount of the urging member. ### Claim 21 (depends on 20) The die-pressing punch according to claim 20, wherein a plurality of engagement depressed portions depressed toward an outer side in a radial direction are formed on an inner circumferential surface of the joint member or an inner circumferential surface of the punch head at intervals along a circumferential direction, and the operable member is provided on the punch head or the joint member movably in the radial direction and has a hook portion capable of engaging with the engagement depressed portions. ### Claim 22 (depends on 21) The die-pressing punch according to claim 21, wherein the operable member disengages the hook portion from the engagement depressed portion by an pressing operation thereof to turn the punch head into the rotatable state about the axial center with respect to the joint member, and engages the hook portion with any of the engagement depressed portions when the pressing operation is released to turn the punch head into the non-rotatable state about the axial center with respect to the joint member. ### Claim 23 (depends on 20) The die-pressing punch according to claim 20, further comprising a stripper spring provided between the joint member and the punch guide on the side of the outer circumferential surface of the punch body for keeping a distance between the punch head and the punch guide in a vertical direction. ### Claim 24 A die-pressing punch used for die-pressing a workpiece, the die-pressing punch comprising: a hollow cylindrical punch guide; a roller unit provided inside the punch guide vertically movably and having a rotatable roller protruding downward from a bottom face of the punch guide; an urging member provided inside the punch guide on an upper side of the roller unit and urging the roller unit downward; a pressing member provided inside the punch guide on an upper side of the urging member and pressing the urging member downward, a height position thereof with respect to the punch guide being configured to be adjustable; and a lock mechanism fixing the height position of the pressing member with respect to the punch guide, wherein an initial load of the urging member is adjusted by adjusting and then fixing the height position of the pressing member with respect to the punch guide to change an initially-compressed amount of the urging member. ### Claim 25 (depends on 16) The die-pressing punch according to claim 16, wherein a gauge mark that indicates the initial urging force of the urging member is provided on an outer circumferential surface of the punch guide. ### Claim 26 (depends on 16) The die-pressing punch according to claim 16, wherein the urging member is a spring. ### Claim 27 (depends on 16) The die-pressing punch according to claim 16, wherein the roller is a ball roller, and the roller unit is a free ball bearing. ### Claim 28 (depends on 27) A die-pressing die set comprising: a die-pressing punch according to claim 27; and a die-pressing die, wherein the ball roller is an upper ball roller, the roller unit is an upper roller unit, and the die-pressing die includes a die body on whose upper face a die hole is formed, and a lower free ball bearing disposed within the die hole and having a rotatable lower ball roller protruding upward from the upper face of the die body. ### Claim 29 (depends on 28) A method for beveling an end edge of a workpiece by use of a die-pressing die set according to claim 28, the method comprising: in a state where the end edge of the workpiece is nipped by the upper ball roller of the die-pressing punch and the lower ball roller of the die-pressing die, moving the die-pressing die set relatively to the workpiece in a horizontal direction along the end edge of the workpiece, wherein, when beveling is done at a corner of the end edge of the workpiece, the die-pressing die set is shifted, relatively to the workpiece, forward and backward in a horizontal direction that divides an intersecting angle of two sides regulating the corner. ### Claim 30 (depends on 20) The die-pressing punch according to claim 20, wherein a gauge mark that indicates the initial urging force of the urging member is provided on an outer circumferential surface of the punch guide. ### Claim 31 (depends on 20) The die-pressing punch according to claim 20, wherein the urging member is a spring. ### Claim 32 (depends on 20) The die-pressing punch according to claim 20, wherein the roller is a ball roller, and the roller unit is a free ball bearing. ### Claim 33 (depends on 24) The die-pressing punch according to claim 24, wherein a gauge mark that indicates the initial urging force of the urging member is provided on an outer circumferential surface of the punch guide. ### Claim 34 (depends on 24) The die-pressing punch according to claim 24, wherein the urging member is a spring. ### Claim 35 (depends on 24) The die-pressing punch according to claim 24, wherein the roller is a ball roller, and the roller unit is a free ball bearing.