THERMAL DISPLACEMENT CORRECTOR FOR TWO-SPINDLE COUNTER LATHE

• Main Author: NAKANISHI KENICHI
• Format: Patent
• Language: English; Japanese
• Published: 25.07.2016
• Subjects: BORING; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PERFORMING OPERATIONS; PHYSICS; REGULATING; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; TURNING

PROBLEM TO BE SOLVED: To enable a more suitable correction of thermal displacement over the full length of a workpiece by neither increasing the number of temperature sensors installed in a machine, nor generating diameter differences or streaks in a workpiece even when the spindle is switched at any position of a workpiece center with regard to means of correcting a position command for a tool in a processing area formed on each spindle side of a two-spindle counter lathe.SOLUTION: A correction value of thermal displacement at the center of a workpiece length is calculated according to a position in a spindle axis direction of a tool. A correction value of right and left spindles is arithmetically operated, and an obtained arithmetic value is interpolated according to a position in the spindle axis direction of a tool with respect to an interspindle distance. For each processing area on each spindle side, a controller 10 registers correction arithmetic expressions 15a, 15b including variables of detected temperatures of a plurality of temperature sensors installed in a machine 1 to use a correction value to which two arithmetic values obtained by the correction arithmetic expressions 15a, 15b have been interpolated with a relative position of the workpiece and the tool in the spindle axis direction.SELECTED DRAWING: Figure 2 【課題】２主軸対向旋盤の各主軸側に形成される加工エリアにおける工具の位置指令の補正手段に関し、機械に設置する温度センサの数を増やすことなく、ワーク中間部のどの位置で主軸を切り替えてもワークに径差や条痕が生じることがなく、ワークの全長に渡ってより適切な熱変位の補正を可能にする。【解決手段】ワークの長さ中間における熱変位の補正値を工具の主軸軸線方向の位置に応じて算出する。左右主軸の補正値を演算し、得られた演算値を主軸間距離に対する工具の主軸軸線方向の位置に応じて補間する。制御器１０には機械１に設置した複数の温度センサの検出温度を変数として含む補正演算式１５a、１５bを各主軸側の加工エリアごとに登録し、補正演算式１５a、１５bで求めた２つの演算値を主軸軸線方向のワークと工具との相対位置で補間した補正値を用いる。【選択図】図２