JP2005088106A - Method and apparatus for calculating working data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a higher working precision by taking a variation in shape of a working tool into consideration. <P>SOLUTION: A method for calculating working data which is a moving locus of the working tool when grinding or polishing an article to be worked by the working tool includes a first prediction step 7 for predicting the variation in shape of the working tool based on a working distance of the tool or elapsed time from the start of working, and a data correction step 9 for correcting the working data when no variation in shape of the tool is recognized based on the variation in shape of the tool predicted in the first prediction step. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for processing a die or the like that requires extremely high-precision processing using a processing tool for grinding and polishing.

When high-precision processing is performed by grinding, the tool wears as processing is repeated. In addition, the change in the amount of cut due to this becomes a problem because it causes a workpiece machining error. As a conventional method for correcting the wear amount, there are a method in which an operator moves a tool while checking the degree of finish, and a method in which a tool is automatically moved by a fixed amount every fixed number of operations. Or, in order to observe and process the wear amount of the processing tool in real time, the method of observing the tool being processed with a camera, the value that can be used to estimate the wear amount such as the contact pressure of the tool and the load of the tool spindle motor in real time There is a method in which the amount of pressing of the tool is estimated and converted into the amount of tool wear and corrected.
JP-A-5-77135

  However, if the shape of the object to be processed is high and the required processing accuracy is high, especially when performing high-precision processing that suppresses the shape error from a comma of several μm to several tens of nanometers, higher processing accuracy In order to obtain this, it is necessary to increase the measurement accuracy of the tool wear amount. For this reason, the accuracy of detecting the wear amount is not sufficient in the observation with the camera or the detection of the contact pressure of the tool, and the wear amount cannot be corrected accurately.

  Further, in the method in which the operator observes and moves the finish, the shape of the processing result cannot be confirmed from the processing data. For this reason, it is necessary to process the workpiece once under the same conditions and generate machining data from the error shape.

  Further, when the machining shape is complicated, it is difficult to confirm whether the machining error is caused by tool wear even if the machining result is compared with the target shape.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to obtain higher machining accuracy in consideration of the amount of change in the shape of the machining tool.

  In order to solve the above-described problems and achieve the object, the machining data calculation method according to the present invention calculates machining data that is a movement locus of the machining tool when the workpiece is ground or polished by the machining tool. A first prediction step of predicting a shape change amount of the processing tool based on a processing distance of the processing tool or an elapsed time from the start of processing, and predicted in the first prediction step. A data correction step of correcting the machining data when there is no change in the shape of the machining tool based on the shape change amount of the machining tool.

  In the machining data calculation method according to the present invention, the machining shape of the workpiece is predicted based on the machining data corrected in the data correction step and the predicted shape change amount of the machining tool. Confirming whether or not the correction condition of the processing data is appropriate by comparing the processing shape of the workpiece predicted in the second prediction step with the target processing shape of the workpiece. And further comprising a process.

  Further, in the machining data calculation method according to the present invention, a display step of three-dimensionally displaying the machining shape of the workpiece predicted in the second prediction step and the target machining shape of the workpiece. Furthermore, it is characterized by comprising.

  In the machining data calculation method according to the present invention, in the first prediction step, the shape change amount of the machining tool is proportional to the machining distance that the machining tool has worked on the workpiece surface of the workpiece. Calculated by reducing the turning radius of the machining tool.

  In the machining data calculation method according to the present invention, in the first prediction step, the shape change amount of the machining tool is calculated based on an abrasion coefficient that is a coefficient indicating a ratio between the machining distance and the abrasion amount of the machining tool. It is characterized by prediction.

  In the machining data calculation method according to the present invention, in the first prediction step, the shape of the machining tool and the shape of the workpiece are defined by three-dimensional data, and the machining tool defined by the three-dimensional data And the shape data of the workpiece are brought into contact according to machining conditions, the contact point between the machining tool and the workpiece and the contact shape thereof are calculated as three-dimensional data, and the machining tool and the workpiece at the contact point are calculated. Both are characterized in that the amount of change in the shape of the machining tool is predicted by calculating the amount of erasure of the contacted part with an arbitrary coefficient set in advance.

  The processing data calculation device according to the present invention is a device that calculates processing data that is a movement trajectory of the processing tool when a workpiece is ground or polished by the processing tool, and the processing distance of the processing tool Or based on the elapsed time from the start of machining, based on the first prediction means for predicting the shape change amount of the machining tool, and on the basis of the shape change amount of the machining tool predicted by the first prediction means, And a data correction means for correcting the machining data when there is no change in the shape of the machining tool.

  In the machining data calculation apparatus according to the present invention, the machining shape of the workpiece is predicted based on the machining data corrected by the data correction unit and the predicted shape change amount of the machining tool. And confirming the suitability of the correction condition of the machining data by comparing the machining shape of the workpiece predicted by the second prediction means and the target machining shape of the workpiece. And a means.

  Further, in the machining data calculation apparatus according to the present invention, display means for three-dimensionally displaying the machining shape of the workpiece predicted by the second prediction means and the target machining shape of the workpiece. Furthermore, it is characterized by comprising.

  Further, in the machining data calculation apparatus according to the present invention, the first predicting means is proportional to a shape change amount of the machining tool on a machining distance obtained by machining the machining tool on a workpiece surface of the workpiece. And calculating by reducing the turning radius of the machining tool.

  In the machining data calculation apparatus according to the present invention, the first predicting means may calculate the shape change amount of the machining tool based on a wear coefficient that is a coefficient indicating a ratio between the machining distance and the wear amount of the machining tool. It is characterized by prediction.

  Further, in the machining data calculation apparatus according to the present invention, the first prediction means defines the shape of the machining tool and the shape of the workpiece by three-dimensional data, and the machining tool defined by the three-dimensional data And the shape data of the workpiece are brought into contact according to machining conditions, the contact point between the machining tool and the workpiece and the contact shape thereof are calculated as three-dimensional data, and the machining tool and the workpiece at the contact point are calculated. Both are characterized in that the amount of change in the shape of the machining tool is predicted by calculating the erasure amount of the contacted portion with an arbitrary coefficient set in advance.

  As described above, according to the present invention, higher machining accuracy can be obtained in consideration of the shape change amount of the machining tool.

  Hereinafter, a preferred embodiment of the present invention will be described.

  FIG. 1 is a diagram showing a block configuration of an embodiment of a machining data calculation apparatus according to the present invention.

  In FIG. 1, a workpiece design shape 1 is a target shape after machining a workpiece, and this design shape is 3D (three-dimensional) shape data, which is an equation and point data.

  The machining condition 2 is data necessary for machining, such as a machining range of the workpiece, an initial position where the machining tool and the workpiece are mounted on the machine, a machining direction / amount of cutting / a machining speed, and the like.

  The initial shape 3 of the machining tool is the initial shape of the machining tool, which is the shape data that defines the 3D shape, the mathematical formula, the point data, and the wear ratio of the machining tool.

  The blank shape 4 is data of a workpiece shape before processing, and this shape is also 3D shape data, which is an equation and point data.

  Reference numerals 5a to 5j are arrows indicating the flow of data in the arithmetic unit.

  The workpiece surface scanning data calculation 6 is a step in which the machining condition 2 and the workpiece design shape 1 data are input according to the data flow 5c and 5a, respectively, and a machining point on the workpiece surface to be machined is calculated. The position of the machining point when scanning on the workpiece surface at a given machining speed is transferred to the next step by a data flow of 5 g, and the distance scanned by the machining tool on the workpiece surface is transferred to the next process by a data flow of 5 e. .

  In the machining tool shape prediction 7, which is a first prediction step for predicting the change value of the shape of the machining tool, the data is transferred in the data flow 5d based on the scanning distance (machining distance) data transferred in the data flow 5e. This is a step of calculating a shape change due to wear of the tool initial shape 3. The calculation method calculates the wear amount from the scanning distance transferred in the data flow 5e and the wear ratio given by the tool initial shape 3, and reduces the turning radius of the machining tool, which is the shape data of the machining tool, to thereby reduce the wear. The shape data of the subsequent machining tool is predicted, and the data is transferred to the next step in the data flow 5f. The wear ratio is a coefficient indicating the ratio between the scanning distance (working distance) of the working tool and the wear amount.

  The machining tool attitude calculation 8 is a process of calculating the attitude of the machining tool. The machining tool attitude that presses the machining tool in the normal direction of the machining point calculated by the workpiece surface scan data calculation 6 and the relative position to the workpiece. The position is calculated, and the data is transferred to the next process in the data flow 5h. In this calculation, the machining tool shape is specified by the predicted value of the machining tool shape given in the data flow 5f, and the calculation is performed.

The drive axis target position calculation 9 of the processing machine, which is a step of correcting the target value of each drive axis of the apparatus so as to correspond to the workpiece design shape, is a machining tool posture including a change value of the machining tool given by the data flow 5h. / Calculates the target position of the drive shaft of the machining apparatus from the relative position to the workpiece, and calculates the target position / speed of the stage of the machining apparatus on which the machining tool and the workpiece are mounted. This target position / velocity is generally called machining data, which is machining data expressed in G code, etc., and is transferred to the next process by the data flow 5i. The workpiece machining shape is calculated from the predicted change value of the machining tool shape. The workpiece predicted shape calculation 10 after machining, which is a process to perform, predicts the workpiece shape after machining using the machining data transferred at 5i and the shape prediction value of the machining tool transferred at 5f. The calculation of the workpiece predicted shape calculation 10 after machining is based on the blank shape 4 transferred in 5b and the machining conditions transferred in 5c and the machining tool shape prediction given in 5f, and the relative position of the blank shape and the machining tool shape. Is calculated, and the calculation is performed to delete the overlapping portion from the blank shape. And a blank shape changes by changing the relative position of a blank shape and a processing tool shape according to processing data. When the machining tool is moved in accordance with the machining data and the overlapping portion with the blank is calculated, the calculation data of the machining tool shape prediction 7 transferred at 5f is used.

  The workpiece shape comparison calculation 11, which is a process of confirming the consistency of the correction conditions, compares the workpiece predicted shape calculated in the post-machining workpiece shape calculation 10 and transferred by the data flow 5 j with the data of the workpiece design shape 1. is there. The shape comparison is displayed by a three-dimensional graph or a 3D model and visually verified. The workpiece predicted shape to be compared here is a result of machining with machining data 5i that is corrected for the gradual wear of the machining tool, but may occur in actual machining in the workpiece predicted shape calculation 5j after machining. The calculation is performed including the change in the shape of the machining tool due to wear, and the workpiece predicted shape substantially coincides with the workpiece design shape. If the data do not match here, for example, the possibility of an input error in the processing conditions such as an excessively wide scanning interval condition when scanning the workpiece surface is verified.

  The processing device numerical control device 12 is a control arithmetic device of the processing device, and performs actual processing according to the processing conditions verified in the workpiece shape comparison calculation 11 by inputting the processing data transferred in the data flow 5i.

  In the above description, the shape change amount (abrasion amount) of the processing tool is predicted based on the scanning distance (processing distance) of the processing tool, but is predicted based on the elapsed time since the start of processing. It may be.

  FIG. 2 is a diagram showing a second example of the machining tool shape prediction step in the present embodiment.

  The flow shown in FIG. 2 is to change the wear ratio of the machining tool from the size of the contact surface with the blank shape of the machining tool in the machining tool prediction process. For example, the convex and concave surfaces are machined with the same tool. In this case, since the contact area is different, the wear ratio of the machining tool is changed. In the initial condition input 14 after the start 13 in the flow of FIG. 2, all conditions 1 to 4 shown in the block of FIG. 1 such as a machining condition, a workpiece design shape, and a machining tool initial condition are input.

  A merge 15 is a merge point of the processing returned by the conditional branch.

  The machining point calculation 16 calculates the position of the machining point according to the workpiece design shape and machining conditions in order to generate machining data.

  The machining tool posture 17 is a step of calculating the posture / relative position at the machining point of the machining tool.

  The position of the apparatus drive shaft is calculated from the posture / relative position at the machining point of the machining tool and the position of the stage on which the machining tool and the blank (work before machining) are mounted.

  The process of the relative position 19 of the workpiece and the machining tool at the machining point is a process of expressing the position calculated in the previous process by the three-dimensional shape definition (3D data) of the machining tool and the blank.

  The calculation of the overlapping point in the space between the machining tool and the workpiece is to calculate the point where the machining tool and the blank (work before machining) overlap in the 3D shape definition calculated in the previous process. This is a step of calculating a portion to be removed by the step and removing the shape data of this portion from the blank shape data.

  The contact point calculation between the machining tool and the blank is to calculate the point where the blank whose shape has been corrected in the previous process and the machining tool come into contact, and at this time, at the point on the center line of the machining tool, at the position from the tool tip, The contact distance with the blank in the circumferential direction of the machining tool expressed as a rotating body is calculated. The points on the center line are calculated every distance interval (for example, about 50 nm) arbitrarily determined from the tool tip.

  The machining tool wear amount calculation 22 calculates the wear amount of the machining tool from the initially set wear coefficient and the contact distance between the machining tool and the blank calculated in the previous process, and from any point on the center line of the machining tool. The amount of wear in the radial direction is calculated.

  The shape calculation 23 after wear of the processing tool is a step of defining the shape of the processing tool whose shape has changed due to wear from the amount of wear in the radial direction of the processing tool calculated in the previous step.

  The tool shape output at the machining point is a step of outputting the shape of the machining tool calculated in the previous step as three-dimensional data.

  The next machining point calculation 24 and the determination of whether the next machining point is within the machining range 25 determines whether the next machining point on the workpiece machining surface is within the machining range set in the machining conditions according to the machining conditions. If it is within the machining range, the generation of the machining data is not finished yet, and the wear of the machining tool at the next machining point is predicted, and if the machining range is exceeded, it is finished.

  FIG. 3 is a view showing a form of the machining tool.

  The processing tool 28 is a cylindrical processing tool and rotates around the rotation center line 29. In addition, the processing tool 28 is pressed at a contact point with the workpiece 30 with an inclination of 45 degrees with respect to the normal line of the workpiece 30. An arbitrary calculation interval 31 on the rotation center line is an interval for calculating the wear amount at which the radius of the machining tool is worn, and is calculated at intervals of about several nm to several μm. The radius 32 of the first point and the radius 33 of the second point are both the radius of the machining tool 28. In the process of machining after the machining tool 28 performs dressing, the radius gradually increases due to wear from the cylindrical shape. Change.

  In the shape prediction of the processing tool of the present embodiment, the contact distance between the processing tool 28 and the workpiece 30 is determined when the processing tool rotates in the negative direction of the Z direction 36 while rotating about the rotation center line 29. The amount by which the rotation radii 32 and 33 of the machining tool 28 change when the machining tool 28 is moved in the direction of scanning on the workpiece (for example, the X direction 34 in FIG. 3) is calculated.

  FIG. 4 is a diagram showing a machining apparatus that uses the machining data calculation apparatus of this embodiment.

  Since the work 30 is mounted on the Y stage 38 that moves in the Y direction 35, and the Y stage 38 is mounted on the X stage 37 that moves in the X direction 34, the work 30 can move on the XY plane.

  The processing tool 28 is mounted on a spindle 41 that rotates the tool and is mounted on a B-axis 40 that rotates about 35 in the Y direction. The contact angle of the machining tool 28 to the workpiece can be changed by the rotation of the B-axis 40. Since the B axis 40 is mounted on the Z stage 39 that moves in the Z direction 36, the relative position between the machining tool 28 and the workpiece 30 is changed by driving the X stage 37 / Y stage 38 / Z stage 39 and the B axis 40. Can be processed.

  FIG. 5 is a diagram showing an example of the design shape of the workpiece.

  The correction conditions of the machining tool and the workpiece design shape data are displayed as three-dimensional data so that the error and the shape are visually clarified like the 3D data and the data of FIG.

  FIG. 6 is a block diagram of a conventional apparatus.

  In FIG. 6, since the machining tool shape prediction 7 as in the present embodiment is not provided, high-precision machining as in the present embodiment is difficult.

  As described above, according to the above embodiment, the following effects can be obtained. (1) The processing surface prediction method for processing the processing surface of the workpiece with the processing tool for grinding is changed from the shape of the processing tool in the initial state to a predetermined processing amount or a change in the processing tool after a lapse of time. A first prediction step for predicting a value, and a correction step for correcting the movement amount of each axis of the apparatus so as to correspond to the workpiece design value, the change value of the machining tool in the first prediction step. By doing so, since the wear value is not detected in real time, there is no restriction due to its accuracy.

  (2) In the above correction step, a second prediction step for predicting the machining shape of the workpiece from the movement data of the device including the correction value and the predicted change value of the machining tool, and the workpiece predicted in the second prediction step. By comparing the predicted shape of the workpiece with the design value of the workpiece and confirming the consistency of the correction conditions of the machining tool, it is configured to have a machining surface predicting means, so that the shape change due to wear of the machining tool Predicting and creating machining data according to this makes it possible to perform highly accurate machining, and further, it is possible to compare the workpiece predicted shape and the design value of the workpiece when machining with this machining data.

This
(a) It is not necessary to perform the actual machining twice, once the actual machining is performed, and as a result, the machining is performed again.

    (b) When the workpiece shape after machining is predicted from the machining data without considering the wear of the tool as in the conventional case, an error in the workpiece shape is caused by the amount of wear of the tool. However, in the above embodiment, the shape change of the machining tool Since the machining data is generated by predicting the above, the wear of the machining tool is taken into consideration in the process of predicting the workpiece shape, and the predicted value substantially matches the design value of the workpiece.

    (c) Since it is possible to try an arbitrary wear coefficient in the machining tool shape prediction step, it is possible to calculate the predicted shape of the workpiece when the method of tool wear changes.

  (3) A first prediction step of predicting a predetermined machining amount or a change value of the machining tool after elapse of time from the shape of the machining tool in an initial state is proportional to a scanning distance scanned by the machining tool on the work surface. This is calculated by reducing the turning radius of the machining tool, and the ratio of wear to the scanning distance (machining distance) of the tool is set to a dummy spherical surface, for example, by configuring the proportionality coefficient to be an arbitrary wear coefficient. If the workpiece shape is changed once, even if the workpiece shape is changed, machining data can be created and machined without performing dummy machining each time.

  (4) The first prediction step for predicting the change value of the machining tool defines the shape of the machining tool and the workpiece shape with the three-dimensional data in the machining data computing device, and the machining tool and workpiece defined in the three-dimensional It has a function to contact the shape data according to the processing conditions and calculate the contact point between the processing tool and the workpiece and the contact shape in three dimensions. At the contact point, both the processing tool and the workpiece are contacted with an arbitrary coefficient set in advance. By calculating the erasure amount of the processed part, it is configured to predict the shape change of the machining tool, so that the place where the machining tool contacts the workpiece changes as when the workpiece shape changes from concave to convex, for example. This makes it possible to calculate the amount of contact of the machining tool with the workpiece, so it is possible to predict changes in the amount of tool wear due to changes in the amount of contact. Degree of processing becomes possible.

  (5) a second prediction step of predicting the machining shape of the workpiece from the movement data of the apparatus including the correction value in the correction step and the predicted change value of the machining tool, and a predicted shape of the workpiece predicted in the second prediction step. The process of confirming the consistency of the correction conditions of the machining tool by comparing the workpiece design value and the workpiece design value is displayed and calculated by a 3D model, and the machining tool in the first prediction process The machining data including the change value and the shape of the machining tool that changes during the machining operation are calculated together, the workpiece design value, the predicted value of the workpiece shape after machining with the machining data including the machining tool change value, and the workpiece design value When the tool diameter and shape change during machining in the conventional machining simulator, machining is simulated according to the machining data by configuring the difference to be displayed by a 3D model. This change amount was calculated and displayed as a machining error as it is, but since the machining tool shape change is also calculated during this calculation process, the difference between the workpiece design value, the predicted workpiece shape value, and the workpiece shape is displayed in 3D. This makes it possible to check machining data input errors at a glance before machining.

It is a figure which shows the block configuration of one Embodiment of the process data calculation apparatus of this invention. It is a figure which shows the 2nd example of the shape prediction process of the processing tool in one Embodiment. It is the figure which showed the form of the processing tool. It is a figure which shows the processing apparatus which uses the processing data calculation apparatus of one Embodiment. It is a figure which shows an example of the design shape of a workpiece | work. It is a figure which shows a prior art example.

Explanation of symbols

1 Workpiece design shape data 2 Machining condition data
3 Initial shape of machining tool 4 Blank shape data (initial value of workpiece)
5a to 5j Data transfer direction in processing operation device 6 Machining point (work surface scanning data) calculation process 7 Machining tool shape prediction process 8 Machining tool posture calculation process 9 Machining machine drive axis target data (machining data) calculation process 10 Workpiece Shape Prediction Process 11 Workpiece Design Shape and Work Predicted Shape Comparison Process 12 Machining Device Numerical Control Device 13 Start Step 14 Machining Condition Input Step 15 Merge Step 16 Machining Point Calculation Step 17 Machining Tool Posture Calculation Step 18 Device Drive Axis position calculation step 19 Relative position calculation step of workpiece and machining tool at machining point 20 Work overlap portion elimination step of machining tool 21 Contact point calculation step of machining tool and workpiece 22 Abrasion amount calculation step of machining tool 23 Shape of machining tool Prediction calculation step 24 Tool shape output at machining point 25 Processing point calculation step 26 Calculation end judgment step 27 End step 28 Machining tool 29 Center of rotation of the processing tool 30 Work 31 Arbitrary calculation interval on the rotation center line 32 Machining radius of the processing tool of the first point 33 Machining of the second point Tool turning radius 34 X direction 35 Y direction 36 Z direction 37 X stage 38 Y stage 39 Z stage 40 B axis 41 Spindle mechanism

Claims (12)

A method of calculating processing data that is a movement locus of the processing tool when a workpiece is ground or polished by a processing tool,
A first prediction step of predicting a shape change amount of the processing tool based on a processing distance of the processing tool or an elapsed time from the start of processing;
A data correction step of correcting the machining data when there is no shape change of the machining tool, based on the shape change amount of the machining tool predicted in the first prediction step;
The processing data calculation method characterized by comprising. In the second prediction step, the second prediction step predicts the machining shape of the workpiece based on the machining data corrected in the data correction step and the predicted shape change amount of the machining tool. The method further comprises a confirmation step of comparing the predicted machining shape of the workpiece with a target machining shape of the workpiece to confirm whether the correction condition of the machining data is appropriate. Item 2. The processing data calculation method according to Item 1. 3. The display step of three-dimensionally displaying the machining shape of the workpiece predicted in the second prediction step and the target machining shape of the workpiece is further provided. The processing data calculation method described. In the first prediction step, the shape change amount of the processing tool is calculated by reducing the turning radius of the processing tool in proportion to the processing distance processed by the processing tool on the processing surface of the workpiece. The processing data calculation method according to claim 1, wherein the processing data is calculated. 2. The shape change amount of the machining tool is predicted in the first prediction step based on an abrasion coefficient that is a coefficient indicating a ratio between a machining distance and an abrasion amount of the machining tool. Machining data calculation method. In the first prediction step, the shape of the machining tool and the shape of the workpiece are defined by three-dimensional data, and the shape data of the machining tool and the workpiece defined by the three-dimensional data are determined according to machining conditions. The contact point between the processing tool and the workpiece and the contact shape is calculated as three-dimensional data, and the processing tool and the workpiece are in contact with each other at an arbitrary coefficient set in advance at the contact point. The machining data calculation method according to claim 1, wherein a shape change amount of the machining tool is predicted by calculating an erasure amount. An apparatus for calculating processing data that is a movement locus of the processing tool when a workpiece is ground or polished by a processing tool,
First predicting means for predicting a shape change amount of the processing tool based on a processing distance of the processing tool or an elapsed time from the start of processing;
Data correction means for correcting the machining data when there is no shape change of the machining tool based on the shape change amount of the machining tool predicted by the first prediction means;
A processing data calculation device comprising: Second prediction means for predicting the machining shape of the workpiece based on the machining data corrected by the data correction means and the predicted shape change amount of the machining tool, and the second prediction means. The apparatus further comprises confirmation means for comparing the predicted machining shape of the workpiece with a target machining shape of the workpiece and confirming whether the correction condition of the machining data is appropriate. Item 8. The machining data calculation device according to Item 7. 9. The display apparatus according to claim 8, further comprising a display unit that three-dimensionally displays the machining shape of the workpiece predicted by the second prediction unit and the target machining shape of the workpiece. The processing data calculation device described. The first predicting means calculates a shape change amount of the processing tool by reducing a turning radius of the processing tool in proportion to a processing distance processed by the processing tool on a processing surface of the workpiece. The processing data calculation device according to claim 7, wherein The said 1st prediction means predicts the amount of shape changes of the said processing tool based on the wear coefficient which is a coefficient which shows the ratio of the processing distance and the amount of wear of the said processing tool. Machining data calculation device. The first predicting means defines the shape of the machining tool and the shape of the workpiece by three-dimensional data, and the shape data of the machining tool and the workpiece defined by the three-dimensional data according to machining conditions. The contact point between the processing tool and the workpiece and the contact shape is calculated as three-dimensional data, and the processing tool and the workpiece are in contact with each other at an arbitrary coefficient set in advance at the contact point. The machining data calculation apparatus according to claim 7, wherein a shape change amount of the machining tool is predicted by calculating an erasing amount of the machining tool.