摘要:
A method and apparatus for specifying a three-dimensional curve having steps of entering data specifying a first projection curve (CV.sub.1) and a second projection curve (CV.sub.2) is obtained when a three-dimensional curve (31a) is projected onto two adjacent planes (e.g., an XY plane and a YZ plane) in a rectangular coordinate system. The method also includes finding coordinate values (a.sub.i, b.sub.i) of an i-th (i=1, 2 . . . ) partition point P.sub.i from among partition points partitioning the first projection curve (CV.sub.1) into a number of line segments and finding coordinate values (b.sub.i,c.sub.i) of a point Q.sub.i on the second projection curve (CV.sub.2) having a coordinate value b.sub.i on a common axis (Y axis) among coordinate axes of the two adjacent planes. The three-dimensional curve (31a) is specified by a collection of points (R.sub.i) having the three-dimensional coordinate values (a.sub.i, b.sub.i, c.sub.i).
摘要:
A method of controlling a comb-cutter lathe in which one face of a tool rest (TBS) is provided with two or more juxtaposed tools (TL1, TL2) for subjecting a workpiece (WK) to machining by using: (1) predetermined tools in succession, (2) part dimensions, (3) a tool selection sequence, (4) a machining start location for each tool, and (5) mounting dimension information measured from a reference point on the tool rest to a distal end of each tool. Machining is sequentially performed based on this information by predetermined tools at machining locations (P.sub.5 -P.sub.4 -P.sub.3 -P.sub.2 -P.sub.1 ; P.sub.6 -P.sub.7 -P.sub.8 -P.sub.9 -P.sub.10) assigned to the tools, and after machining is completed by a first tool (TL1), the tool rest (TBS) is moved to position the next tool (TL2) at a machining location and machining is performed by that tool. The method includes moving the tool rest along a Z axis to a point P.sub.r at which none of the tools (TL1, TL2) will contact the workpiece (WK) when the tool rest (TBS) is moved in a direction (X-axis direction) at right angles to the longitudinal direction (Z-axis direction) of the workpiece, and thereafter moving the tool rest along the X axis to a point P.sub.t at which an X-axis position of a selected tool coincides with an X-axis coordinate value of a position at which machining is to be started by the selected tool, and thenforth performing machining using the selected tool.
摘要:
A curved surface generation method well-suited for application to the preparation of a numerical control tape used in the numerically controlled machining of a three-dimensional body such as a three-dimensional mold. The surface creation method includes steps of defining, on a first section curve or reference curve of a three-dimensional curved body, a point Pi (i=1,2 . . . ) which corresponds to a point Qi (i=1,2 . . . ) on a second section curve or reference curve, and generating an intermediate section curve in accordance with the established correspondence. A curved surface is created by collecting a plurality of the intermediate section curves together. Accordingly, the invention raises the degree of freedom with which a curved surface is created, and enables the accurate creation of a curved surface featuring subtle changes, allowing the precise machining of a three-dimensional body.
摘要:
A tool interference checking method for checking whether a tool (TL) will interfere with a workpiece (WK) when the tool is transported relative to the workpiece to cut the workpiece on the basis of NC data comprising a number of blocks (B.sub.1 -B.sub.5), characterized by having steps of obtaining tool travelling directions (+X, -Y, +X, +Y, +X) indicated by the NC data in respective blocks, obtaining a tool offset path (TCP) using the tool diameter and NC data, obtaining tool travelling directions (+X, -Y, -X, +Y, +X) in respective blocks of the tool offset path, comparing, for each and every block, the tool travelling direction indicated by the NC data and the tool travelling direction indicated by the tool offset path, and rendering a decision to the effect that tool interference will occur if the tool travelling directions are in non-agreement in at least one block.
摘要:
A method of approach in area cutting includes giving in advance an angle .theta. between a workpiece plane (WPL) and a straight line (SL) connecting an approach starting point (P.sub.A) and a cutting starting point (P.sub.i), and a distance dz between the approach starting point (P.sub.A) and the cutting starting point (P.sub.i) in a direction perpendicular to the workpiece plane. Coordinate values of the approach starting point (P.sub.A) are calculated using the angle .theta. and the distance dz in such a manner that a projection (SL') of the straight line (SL) on the workpiece plane (WPL) is brought into orientation with a direction of a normal line at the cutting starting point (P.sub.i) on a curve (OLC) of the external shape. A tool (TL) is positioned at the approach starting point (P.sub.A) in a rapid-traverse mode, and the tool is subsequently moved to the cutting starting point (P.sub.i) in a cutting-feed mode. Thereafter, cutting is started.
摘要:
An angle data discriminating method in a method of creating NC machining data by entering a direction for each block (b.sub.1 -b.sub.5) of a part profile through use of a profile symbol key thereby to specify the part profile, followed by entering a dimension for each block of the part profile and using these entered data to create the NC machining data, the method having a first step of specifying dimensions of straight line elements (L.sub.3, L.sub.4) in predetermined blocks (b.sub.3, b.sub.4) by data including at least angles of intersection between the straight line elements and a base line (Z axis), and a second step of recognizing, by using the angles and the directions of the straight line elements in the blocks, that the straight line element lies on a straight line obtained by rotating the base line about the points of intersection in predetermined directions and through predetermined angles.
摘要:
A memory is provided with an input of such data as section data and section curve data provided on a blueprint, and a cylindrical intermediate section generating device generates an intermediate section based on the data in accordance with a cylindrical intermediate section generating method selected from a plurality of such methods. A cylindrical intermediate section curve generating device generates an intermediate section curve based on the data in accordance with a cylindrical intermediate section curve generating method selected from a plurality of such methods. A tape creation control unit effects a conversion into a machine tool NC tape format based on the intermediate section and section curves.
摘要:
A program for operating a numerical control machine tool written in problem oriented language is translated into machine oriented language through the use of the present NC tape producing system. The present system has a mini-computer mounted in a desk type cabinet, which has also a printer, an input tape reader, an output tape puncher, a key board, and a mini-board panel, each connected to said mini-computer. The mini-board panel is covered with the mini-board sheet indicating the roles of keys under the mini-board sheet. The system is automatically initialized just by turning on a power switch, or pushing a load key, and the program for operating the mini-computer itself is automatically loaded in the memory of the mini-computer through said input tape reader. Thus, the operation of the system is very easy. A problem oriented source program is applied to the system through the input tape reader, translated by the mini-computer to a machine language program, which is in turn obtained from said output tape puncher.
摘要:
The present invention provides an area cutting method for machining an area (AR) bounded by the curve (OLC) of a predetermined external shape previously using a unidirectional cutting motion. The invention has a step of performing cutting along an i-th cutting path (PT.sub.i), a step, executed after completion of cutting along the cutting path (PT.sub.i), of moving a tool (TL) in a cutting-feed mode along the curve (OLC) of the external shape from a machining end point (Q.sub.i) on the cutting path to a machining end point (Q.sub.i-1) on an (i-1)th cutting path (PT.sub.i-1) previously cut, a step of positioning the tool (TL) from the point (Q.sub.i-1) to a machining starting point (P.sub.i) on the cutting path (PT.sub.i), a step of moving the tool in the cutting-feed mode along the curve of the external shape from the machining starting point (P.sub.i) on the cutting path (PT.sub.i) to a machining starting point (P.sub.i+1) on the next cutting path (PT.sub.i+1), a step of moving the tool in the cutting-feed mode along the cutting path (PT.sub.i+1) to execute cutting along the cutting path (PT.sub.i+1), and a step of repeating these steps to perform area machining.
摘要:
An input data sign determining method in a method of creating NC machining data by entering a direction (.uparw., , .fwdarw., , .dwnarw., , .rarw., ) for each block (b.sub.1 -b.sub.8) of a part profile through use of a profile symbol key thereby to specify the part profile, followed by entering a dimension for each block of the part profile and using these entered data to create the NC machining data, the method having steps of entering, in the form of an incremental quantity along each axis (x, z), a part profile dimension in a predetermined block, discriminating the direction of the part profile in the block, and determining the sign of an entered incremental quantity on the basis of the direction to convert the incremental quantity into a signed incremental quantity.