TEMPERATURE DISTRIBUTION CALCULATING METHOD IN OPERATING BALL SCREW AND DISPLACEMENT CORRECTION METHOD BASED ON THE METHOD

• Main Authors: NAGAI JIRO, ASAKURA YOSHIHIRO, IWAMOTO RIEKO, TAKINAMI NORIO, ISHIMOTO KOSUKE
• Format: Patent
• Language: English
• Published: 24.07.2008
• Subjects: COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a method of suitably correcting a command position in each operating time in due consideration of temperature distribution in each position due to generation of heat in an operating stage, in a ball screw. SOLUTION: According to the temperature distribution calculating method in the ball screw, temperature is measured on both ends of the ball screw 1 and a female screw 2 at intervals of predetermined time, and the temperature distribution of each section unit by integrals of a differential equation based on a time interval (Δt) and a unit section width (Δx) is calculated at intervals of the predetermined time passage by a micro-computer. According to the method of correcting the displacement of a command position in the ball screw, an increment of a distance from a fixed end 11 in each predetermined position is calculated based on the concerned temperature distribution, and when tensile stress is applied at need, in consideration of mechanical deformation amount due to the tensile stress, the distance is corrected to achieve the above problem. COPYRIGHT: (C)2008,JPO&INPIT