JP2005034961A - Numerical control machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an NC machining device capable of making less occurrence of rejected products than conventional ones and quickly handling workpieces requiring corrective work. <P>SOLUTION: The NC machining device 10 automatically generates corrective working NC data while fixing a workpiece W on a jig 14 and correctively works on it, whereby the occurrence of rejected products is reduced compared with conventional ones and the workpieces requiring the corrective work can be quickly handled. In addition, a machined surface having a larger than reference ratio occupied by an area with a machining margin left more than a predetermined reference value is made to be a remaining machining margin region, so that judgment of the remaining machining margin can be stably made with a disturbance such as cutting chips eliminated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an NC processing apparatus that performs positioning control of a tool or a jig in accordance with reference NC data based on a designed target shape to process a workpiece so as to approach the target shape.

Conventionally, as this type of NC machining apparatus, there is known a machine that attaches a touch sensor to a spindle of a machining center instead of a tool and measures a machining error of a workpiece with respect to a target shape (for example, see Patent Document 1). In this NC machining apparatus, a workpiece whose machining error is outside the allowable range is excluded as a rejected product (NG product).
JP-A-5-253800 (Claim 1, paragraphs [0008] and [0010])

  Incidentally, there is a case where the machining error of only a part of the workpiece is outside the allowable range, and the machining error of the other part is within the allowable range. However, in the above-described conventional NC machining apparatus, even when a machining error of only a part of the workpiece is out of the allowable range, it has been excluded as a rejected product, which can cause a great resource loss.

  Even if the NC machine repeats the same operation, the machining accuracy can change over time due to thermal expansion and wear of the tool. Therefore, when performing correction processing on a workpiece, NC data for correction processing must be individually created for each workpiece, and it takes a long time to create NC data. For this reason, once rejected workpieces were removed from the NC processing machine, NC data for correction processing had to be created and then set again on the NC processing machine, resulting in poor work efficiency.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an NC machining apparatus that can reduce the number of rejected products and can quickly process a workpiece that requires correction machining.

  The NC machining apparatus according to the invention of claim 1 made to achieve the above object performs positioning control of a tool or a jig in accordance with reference NC data based on a target shape of the workpiece, and the workpiece fixed to the jig is set to the target shape. Machining error that measures the machining error between the actual shape of the workpiece machined according to the reference data and the target shape while the workpiece is fixed to the jig Based on the measurement results of the measuring means and the machining error measuring means, a remaining machining allowance part specifying means for identifying a remaining machining allowance part in which a machining allowance exceeds a predetermined reference value in the workpiece, Correction machining NC data generating means for generating correction machining NC data for making the value below a predetermined reference value, and correction for positioning control of the tool or jig in accordance with the correction machining NC data Characterized in place and a factory controller.

  According to a second aspect of the present invention, in the NC machining apparatus according to the first aspect, the correction machining NC data generating means sets the target machining surface for the correction machining at a position deeper than the machining surface in the target shape. It has a feature in generating NC data.

  According to a third aspect of the present invention, in the NC machining apparatus according to the first or second aspect, the correction machining NC data generating means generates the correction machining NC data so that the remaining amount of cutting is smaller than the setting by the reference NC data. It has a feature.

  According to a fourth aspect of the present invention, in the NC machining apparatus according to the third aspect, the correction machining NC data generation means sets at least one of a cutting amount, a pick feed, a feed speed, and a tool rotation speed based on the setting based on the reference NC data. It is characterized in that the correction machining NC data is generated so that the remaining amount of cutting becomes smaller than the setting by the reference NC data.

  According to a fifth aspect of the present invention, in the NC machining apparatus according to any one of the first to fourth aspects, the remaining machining allowance portion specifying means has a portion where the machining allowance remains at a predetermined reference value or more when a predetermined reference ratio is exceeded. It is characterized in that the occupied machining surface is the remaining machining allowance.

  According to a sixth aspect of the present invention, in the NC machining apparatus according to any one of the first to fifth aspects, the remaining machining allowance site specifying means divides a machining surface exceeding a predetermined area into a plurality of machining areas, and performs the machining. It is characterized in that a portion of the region where the machining allowance exceeds a predetermined reference value is a remaining machining allowance region where the machining region occupies a predetermined reference ratio or more.

  According to a seventh aspect of the present invention, in the NC machining apparatus according to any one of the first to sixth aspects, the machining surface in the target shape and the machining surface of the actual shape of the workpiece are positioned at a predetermined reference value or more as a whole. A misalignment part specifying means for identifying the misalignment part that caused the misalignment is provided, and the correction machining NC data generating means generates correction machining NC data for setting the positional deviation amount of the misalignment part to a reference value or less. However, it has characteristics.

  According to an eighth aspect of the present invention, in the NC machining apparatus according to the seventh aspect, the correction machining NC data generating means is a target for correction machining on a side opposite to the position where the positional deviation has occurred with respect to the machining surface in the target shape. It is characterized in that the NC data for correction machining is generated so as to set the machining surface.

[Invention of Claims 1, 2, 3, 4]
In the NC machining apparatus according to claim 1, the machining error of the workpiece is measured while the workpiece machined according to the reference NC data is fixed to the jig, and the machining allowance more than a predetermined reference value remains. Specify the machining allowance part. Then, the correction machining NC data generating means generates correction machining NC data for making the machining allowance of the remaining machining allowance portion equal to or less than the reference value, and corrects the remaining machining allowance portion according to the corrected machining NC data. . As described above, according to the present invention, NC data for correction processing is automatically generated and correction processing is performed while the workpiece is fixed to the jig, so that the generation of rejected products is reduced and correction is performed. It is possible to quickly process a workpiece that requires machining.

  Here, in order to remove the machining allowance remaining in the remaining machining allowance portion, the correction machining NC data may be generated so that the remaining machining amount is smaller than the setting based on the reference NC data (invention of claim 3). . Specifically, at least one of the cutting amount, the pick feed, the feed speed, and the tool rotational speed may be made smaller than the setting based on the reference NC data (invention of claim 4).

[Inventions of Claims 5 and 6]
In addition, the remaining machining allowance is eliminated by setting the machining surface where the machining allowance remaining above the predetermined reference value is the remaining machining allowance as the remaining machining allowance. Whether or not it is a part can be determined stably (invention of claim 5). Furthermore, for a machining surface exceeding a predetermined area, the machining surface is divided into a plurality of machining regions, and a machining region in which a machining allowance more than a reference value among those machining regions occupies a reference ratio or more. The remaining machining allowance portion may be used. As a result, the area of the portion subjected to the correction process becomes smaller and the productivity is improved than the correction process of the entire processed surface exceeding the predetermined area.

[Inventions of Claims 7 and 8]
In the NC machining apparatus according to claim 7, when the actual machining surface of the workpiece is displaced more than a predetermined reference value with respect to the machining surface of the target shape, the positional deviation amount of the position deviation portion is set as a reference value. NC data for correction processing is automatically generated as will be described below, and correction processing is performed on the misaligned portion. Specifically, by generating NC data for correction machining so as to set a target machining surface for correction machining on the side opposite to the position deviation side with respect to the machining surface in the target shape corresponding to the position deviation portion, Correction processing can be performed so as to suppress the deviation (the invention of claim 8).

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the NC processing apparatus 10 according to the present embodiment includes a machining center 11 and a work trace apparatus 20, and processes a work W described below.

  The workpiece W is, for example, a molding die, and is formed by forming a molding recess 51 on one surface of the metal block 50 as shown in FIG. The molding recess 51 includes, for example, a semicircular groove 53 that extends from one end of a rectangular parallelepiped main body portion 52, and includes a semicircular flange molding portion 54 at the tip of the semicircular groove 53. Further, the bottom surface 55 of the main body 52 is divided into two in the longitudinal direction by a V-shaped groove 56. Further, the bottom surface 55 of the main body 52 is provided with a pair of round holes 57 and 57.

  The workpiece W is designed by, for example, CAD / CAM provided in a place (for example, a design room) different from the NC processing apparatus 10. The CAD / CAM displays the three-dimensional shape of the workpiece W on the display in accordance with the terminal operation of the designer to assist the design work, and converts the designed shape into NC data as the target shape of the workpiece W. Then, this NC data is stored as reference NC data according to the present invention on-line or temporarily in a storage medium and is taken into the machining center 11.

  The entire machining center 11 is shown in FIG. 1, and is configured such that various machining tools 12T (see FIG. 3) can be attached to and detached from the distal end portion of the main shaft 12 facing in the horizontal direction. In addition, a jig 14 is provided in front of the main shaft 12 in the machining center 11, and the jig 14 is driven by five drive shafts 19 (see FIG. 3) using a servo motor as a drive source. Specifically, the jig 14 is a so-called tilt table, and includes a tilt base 14A and a twist base 14B attached to the tilt base 14A. As shown in FIG. 1, the tilting base 14 </ b> A rotates about the A axis orthogonal to the main shaft 12 and oriented in the horizontal direction, and linearly moves in the X axis direction parallel to the A axis by the linear motion mechanism. To do. Further, the spindle head 12H configured integrally with the spindle 12 linearly moves in the Y-axis direction extending vertically in the column 11C parallel to the spindle 12 and linearly moving in the Z-axis direction. Further, the twist base 14B twists about the B axis orthogonal to the A axis.

  FIG. 3 shows an electrical configuration of the machining center 11. The data storage unit 16 provided in the machining center 11 stores the reference NC data generated by, for example, CAD / CAM in the design room as the reference NC data file 17 as described above. Then, the drive control unit 15 (corresponding to the “correction processing control unit” according to the present invention) provided in the machining center 11 reads the reference NC data from the reference NC data file 17 and drives the jig 14 according to the reference NC data. The shaft 19 and the main shaft 12, the driving shaft of the main shaft head 12H, and the driving shaft of the column are driven. As a result, the processing tool 12T at the tip of the spindle 12 is pressed against the predetermined position of the metal block 50 in a predetermined posture, and the forming recess 51 is processed in the workpiece W.

  As shown in FIG. 1, the work trace device 20 is disposed so as to face the main shaft 12 with the jig 14 interposed therebetween, for example. As shown in FIG. 2, the work trace device 20 includes a touch sensor 25 at the tip of a linear motion rod 21 that moves back and forth in the horizontal direction. The touch sensor 25 has a structure in which the trace terminal 23 protrudes from the tapered sensor base 22. The trace terminal 23 includes, for example, a spherical body portion 24 at the tip of the shaft body, and is always biased to a posture extending coaxially with the sensor base portion 22. Then, the trace terminal 23 is tilted in an arbitrary direction by receiving an external force, and the displacement amount of the spherical body portion 24 is detected by the tilt angle.

  The workpiece tracing device 20 and the machining center 11 are cooperatively controlled by the main control unit 41 shown in FIG. 3 and measure a machining error with respect to the target shape of the workpiece W. Therefore, in the present embodiment, the “working error measuring means” according to the present invention is configured by the work trace device 20, the machining center 11, and the main control unit 41. Further, the CAD / CAM 42 indicated by reference numeral 42 in the figure corresponds to the “remaining machining allowance part specifying means”, the “correction machining NC data generating means” and the “misalignment part specifying means” according to the present invention. The configurations of the main control unit 41 and the CAD / CAM 42 will be described together with the operation of the NC machining apparatus 10 described below.

  The main control unit 41 and the CAD / CAM 42 are accommodated in, for example, a main control box 40 disposed in the vicinity of the machining center 11 and the work trace device 20.

  In order to machine the workpiece W shown in FIG. 5 by the NC machining apparatus 10, first, the metal block 50 in which the molding recess 51 is not machined is fixed to the jig 14. Then, a main start switch (not shown) provided in the main control box 40 is turned on. Then, an activation signal is given from the main control unit 41 to the drive control unit 15 of the machining center 11, and the NC machining apparatus 10 operates as shown in the flowchart of FIG.

  In other words, the drive control unit 15 that has received the start signal from the main control unit 41 reads the reference NC data from the reference NC data file 17 in the data storage unit 16, and performs predetermined machining on the tip of the spindle 12 based on the reference NC data. A tool 12T is mounted. Next, the main shaft 12 and each drive shaft 19 are driven, and the processing tool 12T is pressed against the metal block 50 of the workpiece W fixed to the jig 14 to process the forming recess 51 (S1 in FIG. 4). More specifically, a roughing machining tool 12T is attached to the main shaft 12, and the molding recess 51 is roughly machined in the metal block 50. Then, the finishing machining tool 12T is used to finish the molding recess 51. Cutting or polishing the inner surface.

  When the machining of the workpiece W is completed, a machining end signal is given from the drive control unit 15 to the main control unit 41. In response to this, the main control unit 41 gives a measurement start signal to the work trace device 20 and the drive control unit 15 of the machining center 11. Then, the linear rod 21 in the work trace device 20 is driven forward, and the touch sensor 25 approaches the jig 14 side. On the other hand, the drive control unit 15 reads the measurement NC data from the measurement NC data file 43 in the data storage unit 16. Then, by driving the drive shaft 19 and controlling the posture of the jig 14, the spherical portion 24 of the trace terminal 23 is pressed against the machining surface of the workpiece W and is displaced, and the workpiece W Trace is made over the entire processing surface (S2).

  At this time, along with the change in the posture of the workpiece W, the CAD / CAM 42 receives the posture data of the workpiece W from the drive control unit 15 and the data related to the displacement direction and the displacement amount of the sphere unit 24 from the workpiece trace device 20. (S3). Then, the CAD / CAM 42 calculates the actual shape of the workpiece W based on the acquired data, and compares it with the target shape based on the model data (same as the reference NC data) stored in the CAD / CAM 42 ( S4 to S6).

  Specifically, the origin position is specified from the actual shape of the workpiece W obtained from the actual measurement data (S4). Specifically, for example, one end of the main body 52 is defined as an origin on the end surface of the metal block 50 where the molding recess 51 is formed, and three orthogonal sides of the main body 52 extending in three directions from the origin are defined as X, Y, The Z coordinate is used.

  And the target shape of the workpiece | work W based on model data and the actual shape of the workpiece | work W are piled up, and the process error between them is calculated (S5). Here, when the machining error between the actual shape and the target shape of the workpiece W is within a predetermined reference value (within a predetermined allowable range), the workpiece W is a pass product, so the NC A notification that the entire process by the processing apparatus 10 has been completed is performed. In addition, when the actual shape of the workpiece W is excessively cut from the target shape, it is notified that the workpiece W is a rejected product.

  In cases other than the above-mentioned acceptable products and non-acceptable products, the CAD / CAM 42 has a portion where the machining allowance exceeds a predetermined reference value in the workpiece W occupied a predetermined reference ratio (for example, 80%) or more. The machined surface is specified as the remaining machining allowance (S6). Specifically, as shown in FIG. 6, for example, the bottom surface 56A2 of the V-shaped groove 56 in the workpiece W is a predetermined reference value with respect to the bottom surface 56A1 of the V-shaped groove 56 in the target shape (see error δ1 in FIG. 6). When the portion where the machining allowance is left occupies a predetermined reference ratio or more, the bottom surface 56A2 of the V-shaped groove 56 is recognized as the remaining machining allowance portion.

  Further, the CAD / CAM 42 divides a relatively large machining surface exceeding a predetermined area into a plurality of machining areas, and a portion of the machining area where a machining allowance exceeds a predetermined reference value is predetermined. The machining area that occupies more than the standard ratio is recognized as the remaining machining allowance. Specifically, as shown in FIG. 7, for example, the bottom surface 55 of the main body 52 in the workpiece W is recognized as a relatively large processing surface exceeding a predetermined area, and the bottom surface 55 is defined as a plurality of processing regions R1, R2, and so on. Divide into R3 .. Then, only the machining regions R2, R3, R6, and R7 in which the portion where the machining allowance exceeds a predetermined reference value occupies the predetermined reference ratio or more is recognized as the remaining machining allowance portion.

  Further, the CAD / CAM 42 specifies a position shift portion where a position shift between the processing surface in the target shape and the processing surface of the actual shape of the workpiece W has occurred. Specifically, as shown in FIG. 8, the center of the round hole 57 is shifted from the round hole 57A1 in the target shape by more than a predetermined reference value (see error δ2 in FIG. 8) and is processed in a range that fits in the round hole 57A1. If so, this is recognized as a position shift portion.

  Next, the CAD / CAM 42 generates NC data for correction machining for each remaining machining allowance part and misalignment part (S7). Specifically, the CAD / CAM 42 generates the NC data for correction machining so as to set the target machining surface for correction machining at a position deeper than the machining surface in the target shape corresponding to the remaining machining allowance portion, for example. Specifically, with respect to the bottom surface 56A2 of the V-shaped groove 56, as a result of processing with the bottom surface 56A1 shown in FIG. 6 as a target, the uncut portion remains beyond a predetermined reference value. A target machining surface for correction machining (see bottom surface 56A3 in FIG. 6) is set at a deeper position, and NC data for correction machining is generated.

  Further, the CAD / CAM 42 generates the correction machining NC data so that the remaining amount of cutting is smaller than the reference NC data corresponding to the remaining machining allowance portion, for example. In order to reduce the remaining amount of cutting, for example, as shown in FIG. 9A, [1] decrease the tool cutting amount (Ad), [2] decrease the pick feed (Pf) of the tool, [3 Examples include setting changes to the reference NC data such as reducing the tool feed speed (f) and [4] reducing the rotational speed (S) of the spindle (tool). In any of these [1] to [4], the uncut remaining amount (Kz) shown in FIGS. 9B and 9C decreases. The reason for this is that, as shown in FIG. 10, when [1] to [3] are changed, the amount of removal (cutting amount) per hour is reduced, the tool load is reduced, and the tool is bent. This is because it decreases. Further, in the above [4], the cutting speed per cutting edge of the tool is reduced, and there is an advantage that the tool life is improved and the tool is hardly worn.

  Specifically, with respect to the machining regions R2, R3, R6, and R7 (see FIG. 7) on the bottom surface 55 of the main body 52, the correction machining NC data is generated only by changing the machining speed slower than the reference NC data. To do. Thereby, it is possible to prevent only the machining regions R2, R3, R6, and R7 on the bottom surface 55 of the main body 52 from being left uncut.

  Further, the CAD / CAM 42 generates correction machining NC data so that a target machining surface opposite to the positional deviation is set with respect to the machining surface in the target shape corresponding to the position deviation portion. Specifically, the round hole 57 shown in FIG. 8 is processed by shifting to the left side by an error δ2 in the drawing with respect to the target-shaped round hole 57A1, and for example, with respect to the target-shaped round hole 57A1. NC data for correction processing is generated so that the round hole 57 is processed with a deviation of δ2 on the right side of FIG.

  If correction work is required for the entire workpiece W, NC data for correction processing for transmitting as a command to correct the whole work is generated.

  As described above, when the generation of NC data for correction machining is completed by the CAD / CAM 42, an end signal is output from the CAD / CAM 42 to the main control unit 41, and the NC data for correction machining is used as the NC data file 18 for correction machining. 11 data storage unit 16. Then, the drive control unit 15 of the machining center 11 corrects the workpiece W according to the correction machining NC data read from the correction machining NC data file 18 of the data storage unit 16. More specifically, when the NC data for correction machining as a command for correcting and processing the entire workpiece W is read, the NC data file 43 for measurement is further read from the data storage unit 16, and the entire workpiece W is processed again. To do. In other cases, based on the read NC data for correction processing, only the remaining machining allowance portion and the position shift portion in the workpiece W are corrected (S8).

  After this correction processing is completed, for example, shape measurement using the workpiece trace device 20 is performed again, and the error between the workpiece W and the target shape is converged to a predetermined reference value or less. Alternatively, after the correction machining is performed several times, the workpiece W in which the machining error between the workpiece W and the target shape does not fall below a predetermined reference value is excluded as a rejected product.

  As described above, in the NC processing apparatus 10 according to the present embodiment, NC data for correction processing is automatically generated and correction processing is performed while the workpiece W is fixed to the jig 14, so that it is a non-acceptable product. It is possible to reduce the occurrence of the workpiece and to quickly process a workpiece that requires correction processing. In addition, the remaining machining allowance is eliminated by setting the machining surface where the machining allowance remaining above the predetermined reference value is the remaining machining allowance as the remaining machining allowance. It is possible to stably determine whether or not it is a part. Further, when performing a correction process on a machining surface exceeding a predetermined area, the machining surface exceeding the predetermined area is divided into a plurality of machining areas, and a machining allowance exceeding a predetermined reference value among these machining areas is obtained. Since the remaining machining area is recognized as a remaining machining allowance portion and correction processing is performed, the area of the portion subjected to correction processing is reduced and the productivity is improved as compared with correction processing of the entire relatively wide processing surface.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

(1) Although the workpiece W of the embodiment is a mold, the shape of the workpiece is not limited to the mold.

(2) In the above-described embodiment, the work trace device 20 is provided so as to face the machining center 11. However, even if the touch sensor 25 described above is detachably attached to the spindle of the machining center, the shape of the work can be measured. Good. Further, the touch sensor 25 may be attached to an appropriate position (for example, the column 11C) of the machining center 11 so that it can be retracted during processing of the workpiece W.

(3) The work trace device 20 of the above-described embodiment measures the shape in contact with the workpiece. For example, the workpiece trace device 20 includes a non-contact distance sensor, and scans the surface of the workpiece with the distance sensor. You may make it the structure which measures the shape of this.

(4) In the above-described embodiment, the NC processing apparatus 10 provided with the machining center 11 is exemplified. However, the NC processing apparatus according to the present invention is not limited to the one provided with the machining center, and a lathe or a milling machine is used instead of the machining center. Etc., the NC machining apparatus of the present invention may be configured.

The perspective view of NC processing device concerning one embodiment of the present invention. Side view of shape measuring device Block diagram showing electrical configuration of NC machining equipment Flow chart showing the operation of NC machining equipment Perspective view of workpiece machined by NC machining equipment Partial enlarged perspective view of V-shaped groove in workpiece Perspective view of the bottom of the main body of the work Plan view of round hole in workpiece Conceptual diagram of the state where the tool is machining the workpiece Conceptual diagram of the cutting process

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Processing apparatus 11 Machining center 14 Jig 15 NC drive control part (correction processing control part)
16 Data storage unit 19 Drive shaft 20 Shape measuring device 42 CAD / CAM
55 Bottom (machined surface)
56A2 Bottom (machined surface)
W Workpiece δ1 error δ2 error

Claims (8)

In an NC processing apparatus that controls the positioning of a tool or a jig according to reference NC data based on a target shape of a workpiece, and processes the workpiece fixed to the jig so as to approach the target shape,
Machining error measuring means for measuring a machining error between an actual shape of the workpiece machined according to the reference data and the target shape in a state where the workpiece is fixed to the jig;
Based on the measurement result of the machining error measurement means, a remaining machining allowance part specifying means for specifying a remaining machining allowance part in which a machining allowance remains above a predetermined reference value in the workpiece,
NC data generating means for correction machining for generating NC data for correction machining for making the machining allowance of the remaining machining allowance portion equal to or less than the predetermined reference value;
An NC machining apparatus, comprising: a correction machining control unit that positions and controls the tool or jig in accordance with the correction machining NC data.   2. The correction machining NC data generating unit generates the correction machining NC data so as to set a target machining surface for correction machining at a position deeper than a machining surface in the target shape. The NC processing device described.   3. The NC machining apparatus according to claim 1, wherein the correction machining NC data generating unit generates the correction machining NC data so that a remaining amount of cutting is smaller than a setting based on the reference NC data. 4. .   The correction machining NC data generation means makes at least one of a cutting amount, a pick feed, a feed speed, and a tool rotation speed smaller than the setting by the reference NC data, and the remaining amount of cutting is smaller than the setting by the reference NC data. The NC processing apparatus according to claim 3, wherein the NC data for correction processing is generated as follows.   The remaining machining allowance site specifying means sets a machining surface in which a portion where the machining allowance remains above the predetermined reference value occupies a predetermined reference ratio or more as the remaining machining allowance site. NC processing apparatus in any one of 1-4.   The remaining machining allowance site specifying means divides a machining surface exceeding a predetermined area into a plurality of machining areas, and a portion of the machining area where the machining allowance remains above the predetermined reference value is a predetermined reference. 6. The NC machining apparatus according to claim 1, wherein a machining area occupying a ratio or more is the remaining machining allowance. A misalignment site specifying means for specifying a misalignment site where the machining surface in the target shape and the machining surface of the actual shape of the workpiece are misaligned over a predetermined reference value as a whole;
7. The correction machining NC data generation unit generates correction machining NC data for making a positional deviation amount of the positional deviation portion equal to or less than the reference value. NC machining equipment.   The correction machining NC data generation means generates the correction machining NC data so as to set a correction machining target machining surface on the opposite side of the machining surface in the target shape from the side on which the positional deviation has occurred. The NC machining apparatus according to claim 7, wherein:

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