METHOD AND APPARATUS FOR SETTING OF A MACHINE TOOL

摘要

1329021 Controlling a lathe INDEX-WERKE KG HAHN & TESSKY 3 Sept 1970 [5 Sept 1969] 42229/70 Headings B3B and B3T In a method of setting a machine tool so that a working part of a tool carried by a tool carrier can be made to carry out working movements under the control of an operating programme, the tool carrier is moved from a fixed starting position to bring the working part of the tool to a predetermined control position and storing data representative of the distance moved by the tool carrier from its starting position to the control position whereby the operating programme can be arranged to control said working movements by reference to said data. In the embodiment described the machine tool which is an automatic turret lathe has a longitudinal slide 14 and a cross slide 18 which supports two turrets each carrying cutting tools. In order to control the machining operation of the lathe and to set the lathe so that each tool can carry out a predetermined programme controlled movement apparatus 10 is provided which permits the cutting portion of the tool to be accurately located at a reference point 84 defined by the intersection of two reference planes X and Y, X containing the axis of rotation of the spindle and Y being transverse to the axis of the spindle. The apparatus 10 comprises two L-shaped members 60 and 62 each member having two abutment faces 56 and 561 and 58 and 581 respectively the abutment faces of one member being perpendicular to the abutment faces of the other. Leg portions 64 and 66 of the members 60 and 62 respectively are normally held biased to an inoperative position in which none of the abutment surfaces lie in the respective reference planes. A cutting tool 26 is brought into the reference position 84 by displacement of the slides 14 and 18 the tool point 90 displacing the L-shaped members so that each abutment surface lies in its appropriate plane when the tool point is at the reference point 84. The displacement of the slides 14 and 18 from their initial position is measured by respective sensing devices 46, 48, and 42, 44 and the data so determined is co-ordinated with the displacement of the L-shaped members to determine successive movements of the cutting tool from its initial position. The displacement of the L-shaped members is sensed by switches 78, 80 and 82 which actuate pulse generators which indicate when the cutting tool is in the control position which in conjunction with the data received from the sensors 44, 48 establishes a motion sequence of the tool to the central position from which programmed controlled working movements of the cutting tool are effected. Any deviation due to tool wear can be corrected by the data received by the sensing devices 44, 48.