Abstract: For the function of forming numerical control information prior to machining process, the type of machining (such as drilling, end milling, outer diameter end face, etc.) and machining scope for each machining area is determined by inputting the shapes of a work and a part determining the machining areas based on said shapes, identifying the areas for inner diameter machining out of said machining areas, extracting from said inner diameter machining areas those characteristic areas to the inner diameter machining such as the area where a rear end face exists on the part shape, where a through hole is unprocessed or where a through hole is bored on the work based on the shape elements. As this method does not require preliminary reviewing of the machining method for inner diameter (and especially for small diameter), it allows beginner operators to produce numerical control information as easily as a skilled operator.

Abstract: When a position of a tool blade tip for displaying the work shape, tool shape and tool locus is calculated by an interpolation arithmetic operation based on the interpolation instruction and feed speed instruction within a numerical control data, the calculated position of the tool blade tip is compared with the display scope every time an interpolation arithmetic operation is conducted; a determination is made as to whether or not the tool shape and tool locus to be displayed are inside of the display scope, and when they exist outside, uses a higher speed as the feed speed for the interpolation arithmetic operation. Therefore, even when an operator tries to check numerical control data by reducing the display scope for local graphic display, the interpolation outside the display scope can be conducted at a higher speed to thereby allow the operator to check the numerical control data quickly and immediately.

Abstract: An apparatus for generating numerical control (NC) information automatically determines a division point if two steps are required for machining a part member, and produces NC information for each of divided portions, thereby reducing the time taken to prepare NC information for overall machining. The apparaus includes a division point determination unit for determining a division point between first and second steps based on a material shape, a part shape and a jaw shape supplied: a part shape division unit for generating a first step part shape and a second step part shape based on the division point, the material shape and the part shape: and a material shape division unit for generating a first step material shape and a second step material shape based on the division point, the material shape and the part shape.

Abstract: In a numerical control information generating apparatus and a method for determining machining modes thereof, machining areas are divided appropriately and machining modes most suitable for each divided area are determined. Therefore, the most efficient tool trace can be obtaianed and the overall cutting time can be shortened.

Abstract: A method for determining a machining method in a numerical control information generating apparatus is realized by the steps of: dividing an area where recessed shapes overlap into a machining area where recessed shapes overlap and an area where recessed shapes do not overlap; determining a cutting tool for a machining area where recessed shapes do not overlap; determining whether or not the machining area where recessed shapes overlap can be cut by the same cutting tool, and combining the machining area where recessed shapes overlap with the machining area where recessed shapes do not overlap. As a result of this, machining modes can be determined automatically for a shape where recessed shapes overlap.

Abstract: A method whereby the numerical control information preparing function determines the manner of machining. On the basis of the input shape of a workpiece and on the basis of the input shape of a component part to be obtained from the workpiece, a portion of the workpiece which is to be subjected to outer diameter machining and a portion of the same which is to be subjected to inner diameter machining are determined. Thereafter, a division candidate point is obtained so that each of the portions may be divided, at the division candidate point, into a sub-portion to be subjected to forward cutting and a sub-portion to be subjected to backward cutting. On the basis of the configuration of the backward cutting sub-portion and the shape of the tool to be used, a check is made as to whether any part of the sub-portion can remain uncut after the backward cutting. On the basis of the result of this check, a determination is made as to whether the entire portion should be divided at the division candidate point.

Abstract: A machining method is for determining numerical control information in a numerical control machine tool apparatus. A method includes inputting workpiece data denoting an initial shape of a workpiece which is to be machined, and further inputting product data denoting a desired final shape of the workpiece after it has been machined. Then, a machining area of the workpiece based on the workpiece data and the product data is determined. The thus determined machining area is divided into plural machining locations, and the numerical control information is prepared based on the plural machining locations. The workpiece is then machined based on the thus prepared numerical control information.

Abstract: A numerical control apparatus is characterized by a structure in which: a machining program stores the final shape of a work as well as the shape of a material; designates the outermost point (an apex) on the work in a direction opposing a cutting direction as a cutting reference point; sets linear lines which are respectively lowered from the cutting reference point by cutting depths, and obtains the inter-sections of the lines and the material shape. The intersections thus obtained are classified into points where the tool enters the work zone and points where the tool emerges from the work zone, so that the tool can be moved at a predetermined cutting rate for a cutting operation between the point where it enters and the point where it emerges from the work zone while it is moved at a rapid traverse rate between the emerging point and the point where it re-enters the work zone.