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1. WO2000038879 - METHOD FOR PRETENSIONING A JOINT CONTAINING TWO OR MORE THREADED FASTENERS

Publication Number WO/2000/038879
Publication Date 06.07.2000
International Application No. PCT/SE1999/002487
International Filing Date 28.12.1999
Chapter 2 Demand Filed 12.07.2000
IPC
B23P 19/06 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
POTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
19Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
04for assembling or disassembling parts
06Screw or nut setting or loosening machines
B25B 23/14 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; HANDLES FOR HAND IMPLEMENTS; WORKSHOP EQUIPMENT; MANIPULATORS
BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
23Details of, or accessories for, spanners, wrenches, screwdrivers
14Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
CPC
B23P 19/066
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
POTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
19Machines for simply fitting together or separating metal parts, or metal and non-metal parts, whether or not involving some deformation
04for assembling or disassembling parts
06Screw or nut setting or loosening machines
065Arrangements for torque limiters or torque indicators in screw or nut setting machines
066by electrical means
B23P 19/069
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
POTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
19Machines for simply fitting together or separating metal parts, or metal and non-metal parts, whether or not involving some deformation
04for assembling or disassembling parts
06Screw or nut setting or loosening machines
069Multi-spindle machines
B25B 23/14
BPERFORMING OPERATIONS; TRANSPORTING
25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
23Details of, or accessories for, spanners, wrenches, screwdrivers
14Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
Applicants
  • ATLAS COPCO TOOLS AB [SE/SE]; S-105 23 Stockholm, SE (AllExceptUS)
  • LINDBÄCK, Tobias, Axel [SE/SE]; SE (UsOnly)
Inventors
  • LINDBÄCK, Tobias, Axel; SE
Agents
  • PANTZAR, Tord; Atlas Copco Tools AB S-105 23 Stockholm, SE
Priority Data
9804588-329.12.1998SE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD FOR PRETENSIONING A JOINT CONTAINING TWO OR MORE THREADED FASTENERS
(FR) PROCEDE DE MISE EN TENSION D'UN ASSEMBLAGE COMPORTANT AU MOINS DEUX FIXATIONS FILETEES
Abstract
(EN)
A method for pretensioning a joint to a predetermined clamping load level, which joint is apt to settlement during pretensioning and comprises two or more threaded fasteners (15 a-d) to be tightened by a simultaneous engagement of individually rotated and controlled torque delivering tools (19 a-d), comprising the steps of: I) applying simultaneously a tightening torque on each one of the fasteners (15 a-d), II) measuring during the torque application the instantaneous axial load (F) in each one of the fasteners (15 a-d), III) interrupting the torque application on each one of the fasteners as the axial load (F) on the respective fastener (15 a-d) has reached a predetermined axial load (FT) which corresponds to the intended clamping load level in the joint (10), IV) reapplying a tightening torque one or more times on that fastener or those fasteners (15 a-d) on which the axial load (F) has decreased due to settlement of the joint (10) during one or more relaxation time intervals so as to regain the predetermined axial load level (FT), and V) terminating the pretensioning process of the joint (10) as the axial load (F) has remained substantially unchanged at the predetermined axial load level (FT) for a final time interval in all of the fasteners (15 a-d), thereby providing the intended clamping load level in the joint (10).
(FR)
L'invention concerne un procédé de mise en tension d'un assemblage à un niveau de charge de serrage prédéterminé. Cet assemblage peut se tasser durant la mise en tension et comporte au moins deux fixations filetées (15 a-d) devant être serrées par l'enclenchement simultané d'outils de torsion (19 a-d) que l'on peut commander et faire tourner individuellement. Le procédé comprend les étapes suivantes: I) l'application simultanée d'un couple de serrage sur chaque fixation (15 a-d), (II) le calcul de la charge axiale (F) instantanée pour chaque fixation (15 a-d) lors de l'application du couple de serrage, (III) l'interruption de l'application du couple de serrage sur chaque fixation lorsque la charge axiale (F) de chaque fixation a atteint une charge axiale prédéterminée (FT) correspondant au niveau de charge de serrage voulu pour l'assemblage (10), (IV) une nouvelle application du couple de serrage au moins une fois sur les fixations (15 a-d) sur lesquelles la charge axiale (F) a diminué du fait du tassement de l'assemblage (10) durant des intervalles de temps de relaxation, de façon à retrouver le niveau de charge axiale prédéterminé (FT), et (V) l'arrêt du processus de mise en tension de l'assemblage (10) lorsque la charge axiale (F) de toutes les fixations (15 a-d) est restée pratiquement au niveau de charge axiale prédéterminé (FT) durant un dernier intervalle de temps, fournissant ainsi le niveau de charge de serrage voulu pour l'assemblage (10).
Also published as
US09869671
Latest bibliographic data on file with the International Bureau