Abstract:
A numeric control lathe (10) comprises a controller (24) for controlling the operation of at least one of the spindles (14, 16) and at least one of the tool rests (18, 20) on a lathe base (12) along a plurality of control axes in a plurality of systems. The controller (24) comprises an input section (100) for inputting a plurality of machining programs about a plurality of tools (22) provided to at least one tool rest, a storage section (112) having a plurality of program describing areas (S1, S2, S3) corresponding to the systems respectively for describing and storing therein the inputted machining programs in the program describing areas, and a processing section (116) for assigning the control axes, as reference control axes, to the program describing areas in the memory section and applying a reference control axis, assigned to a program describing area selected arbitrarily from the program describing areas where a machining program for specifying a tool is written, to a practical control axis for controlling the machining operation related to a specified tool specified by one of the machining programs.
Abstract:
A tool-selecting method for automatic programming comprises the steps of: preparing a tooling file by storing in a memory (201) data on a plurality of tools which are simultaneously mounted on a turret, such as the name of a machining step in which each of these tools is employed, tool configuration data, and data on how each tool is mounted on the turret, and also storing in the memory (201) a plurality of tooling files (#1, #2,...#3) which have different combinations of tools; specifying which tooling file to use, together with data for specifying a final part configuration and a machining step; and selecting a tool for the specified machining step from the specified tooling file.
Abstract:
Dans les tours, en particulier les tours à commande NC, où des outils de tout genre, tels que des outils de tournage extérieur et intérieur, sont orientés par rapport à au moins deux rayons de référence et dans lesquels les données caractéristiques de chaque outil sont déterminées par un point de référence du porte-outil en fonction de la position de la pointe de travail, la nouvelle position de travail, qui détermine sur la tourelle le genre d'outil et le rayon de référence respectif, est introduite par la commande à programme au début d'un cycle de travail. La distance entre un point de référence de la tourelle et un point de référence de l'outil situé sur le rayon de référence approprié est appelée de la mémoire. Un coefficient de correction est calculé à partir de la position de départ de la tourelle et de la distance du nouvel outil entre le point de référence de tourelle et le point de référence d'outil. Le coefficient de correction correspond à la différence de la distance entre le point de référence de tourelle et le point de référence d'outil de l'outil précédent. Finalement, la valeur de l'avance pour l'usinage est calculée à partir du coefficient de correction et de la valeur de consigne de position.
Abstract:
A power feeder (10) comprises a flexible strip (12) having a conducting front side (12a) and an insulating back (12b); a retainer unit (20) for holding the strip wrapped on a bar (18) with the back being in close contact with the bar; a feeder unit (22) connected electrically with the front side of the strip; and a base (26) mounted detachably on the headstock (24) of an automatic lathe. A tool-positioning device (14) including this power feeder comprises a driving unit (60) for bringing a tool (56) to be positioned into contact with a front side of the strip; a section (62) for detecting the conduction between the tool and the front side of the strip through the feeder unit to determine the position of contact with the tool; and a corrective processing section (64) for determining the position of the center line (18a) of the bar based on the position of the determined position of contact with the tool and properly correcting the machining position data preset for the tool in accordance with the determined position of the center line. The tool will not directly touch the bar, so that the surface of the bar and the tool itself are protected from damage.
Abstract:
A computing unit (12) produces control signals which, when applied to the control inputs of a conventional numerically controlled lathe (10), cause the lathe cutting tool (60) to be positioned such that contours varying in three dimensions may be realized in a spindle (18) mounted, rotating workpiece (20). The control signals include x and z position signals, defining the position of the cutting tool with respect to the radial (24) and axial (22) axes, respectively, of the workpiece (20), and i and k lead control signals which define the distance traveled by the cutting tool, per revolution of the workpiece, in the radial (24) and axial (22) workpiece axes, respectively. A filtering process (134, 136, 140) operates to delete each control signal having i and k values which are within the x and z tolerence values, respectively, of the immediately preceding control signal, to thereby reduce both the volume of stored data and machining time.
Abstract:
A method of controlling a chasing lathe uses at least two tools (TL1, TL2) provided in parallel on one side of a tool slide (TBS), and a workpiece (WK) is machined by employing a succession of predetermined tools. The method comprises: inputting data on at least part dimensions, tool selection order, positions to be cut by each tool, and mounting dimensions from a reference position of each tool; and machining at the positions (P5-P4-P3-P2-P1; P5-P7-P8-P9-P10) to be machined which are allotted to the respective tools, using the predetermined tools in order on the basis of the data. In addition, during the machining, upon the completion of machining with one tool (TL1), when the subsequent tool (TL2) is being positioned at a position which will be machined thereby by moving the tool slide (TBS), the tool slide (TBS) is moved in the Z-axis direction to a point (Pr) at which none of the tools (TL1, TL2) will come into contact with the workpiece (WK) by the movement of the tool slide (TBS) in the direction (X-axis direction) perpendicular to the longitudinal direction of the workpiece (WK) (Z-axis direction). Thereafter, the tool slide is moved in the X-axis direction to a point (Pt) at which the X-axis position of the selected tool to coincide with the X-axis coordinate of the start position of the machining done by that tool, and then machining is done by employing the selected tool.
Abstract:
The invention is directed to correcting quadrant projections in accordance with a working condition, enhancing an efficiency of working operations and improving a working precision. There is provided a quadrant projection correction storage means (301a, 301b) for storing a plurality of sets of quadrant projection corrections.
Abstract:
A machine tool has a carriage (28), has a workpiece carriage (28) for carrying a workpiece (32) from which material is removed by a tool (54) carried by a tool carriage (48). A two-axis scale (86, 88) is attached to one of the carriages, and cooperates with a reading head (96, 98) attached to the other carriage. The output from the reading head is processed by signalling processing means to provide an indication of the position and/or movement of the carriages relative to each other and for generating positional data about one or both of the carriages to assist in controlling their movement in order to perform a machine operation. By directly measuring the relative positions of the two carriages, problems arising from, for example, distortions of the machine frame on which the carriages are mounted are at least mitigated. A preferred embodiment of the machine incorporates a second reading head attached to one carriage and incorporating the scale on another carriage so that the outputs from the two reading heads can be used to determine whether there has been any relative angular displacement of the paths followed by the carriages. There is also provided a method of determining the linear movement of one of the carriages relative to the other, and the machining process achieved using the machine tool.
Abstract:
This invention relates to a method for surface notching with a combination lathe. A finishing allowance (TC) and a work passage (15) spaced apart from a work passage by an offset quantity (R) are calculated to execute rough working (2) and thereafter the finishing allowance (TC) is finished with the same tool. In this manner the surface notching can be accomplished with a high accuracy.