JP4728205B2 - Machining data generation method - Google Patents

Description

  The present invention relates to a machining data generation method for generating data used in a thrusting apparatus.

  Conventionally, press die manufacturing using CAM (Computer Aided Manufacturing) that creates NC (Numerical Control Machining) programs for machining, etc., using shape data created by CAD (Computer Aided Design) as input data has been performed. Yes. The shape data output from the CAM is sent to a machine tool that can be controlled by CNC (Computer Numerical Control), thereby performing actual machining.

  As the machining method, there is a punching process (plunge process) for roughing a press die. The piercing process is a process of scraping off a portion that is not necessary to be called meat in the process of shaping the workpiece into a desired shape. This processing is performed using, for example, a rotating cutting tool having a diameter of 30 to 80 (a diameter of 30 mm to 80 mm) larger than that in a normal cutting process. In thrusting, the diameter of the cutting tool is gradually reduced, and polishing is performed as a final process, whereby a press die having a desired shape is obtained.

FIG. 10 is an explanatory view showing a conventional thrusting method using a top view. Of the workpiece W, a cutting region Wd to be cut by the cutting tool C is cut when the cutting tool C of the thrusting device descends according to the machining axis and the cutting tool C as a rotating tool touches the workpiece W. Is done. More specifically, the rotating cutting tool C is lowered to the cutting area Wd so that the cutting tool C cuts the cutting area Wd designated in the workpiece W, and the cutting tool C is raised when the cutting at one place is completed. C is pulled up to a predetermined position where it does not hit the workpiece W. Then, the machining axis is moved in the horizontal direction to the next cutting location, and the cutting tool C is lowered again to the cutting area Wd and cut. This is repeated while moving the cutting tool C in the order of positions C1, C2, and C3 shown in FIG. The cutting tool C moves at a constant width and a tool feed pitch (amount) of a constant width, and cuts the cutting region Wd (see, for example, Patent Document 1).
JP 2002-361513 A

  By the way, when the cutting tool C is moved with a constant width and a constant width to cut the cutting region Wd, the cutting is performed at a place where a turning angle or a narrow path generated for turning the workpiece W is formed. The cutting load of the tool C will become large. Since the cutting load on the cutting tool C is larger at the position C3 than the positions C1 and C2 in FIG. 10, the load on the cutting tool C increases at the position C3, the wear of the cutting tool C itself, the shaft metal Causes fatigue and cutting defects. In order to cope with this, an operator has to adjust the speed at which the cutting tool C is lowered (cutting speed), or it has been troublesome to manually divide the machining procedure into a plurality of times and perform a thrusting process.

  The present invention has been made to solve the above-described problems, and its object is to provide a machining data generation method capable of automatic operation to reduce the cutting load on a portion where the cutting load of the cutting tool is high. Is to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 moves the rotary tool along the machining contour corresponding to the shape model representing the product shape, and at the machining position set on the machining contour. A machining data generation method for generating data for driving a thrusting device that moves the rotary tool along a rotation axis direction to cut a workpiece by a computer, wherein the machining contour is a bottleneck or An auxiliary line segment generating step for generating a processing auxiliary line connecting two points before and after the moving direction of the rotary tool with respect to a position where a turn is formed, and storing the processing auxiliary line in a storage device; and the rotary tool, After passing through the first machining position arranged at a predetermined interval along the machining auxiliary line, a second machining position arranged at a predetermined interval along the machining contour line between the two points is calculated. First processing A machining position calculation step of storing the setting and the second machining position in a storage device; and the second machining position after the workpiece is cut by the rotary tool moved to the first machining position. And a data generation step of creating data for driving the rotary tool and storing the data in a storage device so that the rotary tool is cut by the rotary tool.

  According to this configuration, the machining auxiliary line is created, and the workpiece is cut at the first machining position set by the machining auxiliary line according to the generated machining data, whereby the second set on the machining contour line. The cutting load on the machining position is reduced, cutting by the operator and correction of data become unnecessary, and machining speed and productivity are improved. Further, it is possible to provide a machining data generation method capable of extending the life of the rotary tool by reducing the cutting load to the second machining position where the cutting load of the cutting tool becomes high and further enabling automatic operation. .

Also, split in the auxiliary line generation step of machining data generating method according to claim 1, in a predetermined area including the location, the processing outline of the moving direction front side of the rotary tool relative to the position A division point to be set, a circle having a predetermined diameter passing through the division point is set, and it is determined whether or not the circle intersects or touches the machining contour line on the rear side in the moving direction of the rotary tool with respect to the location. In the case where the circles intersect, the diameter is adjusted so that the circle is in contact with the machining contour line, and the contact point with the circle in contact with the machining contour line is two points before and after the moving direction of the rotary tool, An arc between the two points in the circle is defined as the processing auxiliary line. For this reason, a machining auxiliary line can be formed using a circular shape, and the cutting position and the tool path data of the cutting tool can be automatically generated. By using the tool path data, the cutting load of the cutting tool is high. The load on the part can be automatically reduced.

According to a second aspect of the invention, the machining data generating method according to claim 1, the division points and multiple sets, for each of the division points, and setting the processing auxiliary line, to the processing extension line Since the first machining position is set, it is possible to form a tool path that performs finer piercing and reduce the load on the cutting tool.

The invention according to claim 3 is the machining data generation method according to claim 1 or 2 , wherein when a circle with a predetermined diameter does not intersect and touch the machining contour, Skips the process of creating processing auxiliary lines for the division points. For this reason, in places where there is no bottleneck or turning angle, an extra tool path is not formed by skipping the processing for the area where there is no workpiece, and when tool path data is sent to the thrusting device later, Cutting speed is improved.

According to a fourth aspect of the present invention, in the machining data generation method according to any one of the first to third aspects, in the auxiliary line segment generation step, the machining contour is different in length and both ends of the machining contour before and after the location. Generating a plurality of machining auxiliary lines that overlap the line, and in the machining position calculating step, a first machining position is set for each of the plurality of machining auxiliary lines, and in the data generating step, the plurality of machining auxiliary lines are set. Among them, the cutting tool is moved to the first machining position on each machining auxiliary line in order from the long machining auxiliary line, and then the cutting tool is moved to the second machining position. Processing data is generated so as to perform cutting. According to this configuration, machining data corresponding to various shapes such as a bottleneck can be easily created, and the machining load on the cutting tool can be reduced.

  Therefore, according to the above-described invention, it is possible to provide a machining data generation method capable of automatic operation for reducing the cutting load for a portion where the cutting load of the cutting tool is high.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a CAM system including a thrusting device according to the present embodiment.
In the CAD system 11 of the CAM system 10, a shape model (shape data) representing the product shape is created, and the shape model is sent to the CAD device 12. The CAD device 12 includes a storage device (not shown) accessed from the arithmetic processing device 13, and the shape model is stored in the shape database DB1 stored in the storage device. The shape database DB1 stores in advance product data, mold data for manufacturing the product, material data, and the like. The arithmetic processing unit 13 reads the shape data, the mold data and the material data stored in the shape database DB1, and calculates the thrust calculation data (offset data) based on the data, and the calculated data Is stored in the parameter file database DB2 stored in the storage device. The arithmetic processing unit 13 reads the data stored in the parameter file database DB2 and generates butt machining path data. The thrusting path data is data for controlling the machine tool that performs the thrusting, and the arithmetic processing unit 13 calculates the descending depth based on the machining path data, the machining path data, and the shape of the workpiece, These are stored in the butt machining path database DB3. The data stored in this piercing path database DB3 is sent to the piercing apparatus 15.

  The piercing device 15 is supplied with a workpiece to be cast based on the shape model generated by the CAD system 11. The workpiece is formed to be larger than the shape model, and the difference between the surface of the workpiece and the shape model is a portion called meat. The thrusting device 15 has a plurality of rotating cutting tools having different diameters, and thrusts a workpiece with a designated cutting tool based on the thrusting path data received from the CAD device 12.

In the CAD device 12, a process for creating the punching data as the data generation process will be described with reference to the flowchart shown in FIG.
First, the arithmetic processing unit 13 reads material data and product data from the material database DB1a and the product database DB1b, respectively. And the arithmetic processing unit 13 calculates | requires the range to process among workpieces using this read data (step 21). Next, the shape data line as the product data is offset on the plane orthogonal to the machining axis direction with respect to the machining range, and the offset line (the machining contour line, hereinafter, the offset line or the offset line constituting the offset line) is formed. (Referred to as data) is stored in the offset database DB2a (step 22). If there is a bottleneck and a turning angle at a site that requires machining, the arithmetic processing unit 13 reads the offset data stored in the offset database DB2a, creates machining auxiliary line data from the offset data, and creates the machining assistance data. The line is stored in a storage device (not shown) (step 23 as an auxiliary line segment generation step). When the processing auxiliary line has been created, the arithmetic processing unit 13 reads out the offset data stored in the offset database DB2a again, and creates equidistant piercing paths (the piercing position and the descending depth) on the processing auxiliary line. To do. After creating the butt machining path, the arithmetic processing unit 13 stores the created data as path data in the butt machining path database DB3 (step 24). Then, the arithmetic processing unit 13 determines a position obtained by dividing the butt machining position on the butt machining path and the machining auxiliary line at equal intervals, and this position data is also stored as path data in the butt machining path database DB3 (machining position). Step 25) as a calculation step.

The processing in steps 23 and 25 will be described in detail below.
FIG. 3 shows a sub-step of step 23 for creating processing auxiliary line data.
First, the arithmetic processing device 13 obtains a point obtained by dividing the offset line within the pitch interval of the thrusting device 15 (step 31). Next, it is determined whether or not there is an unprocessed division point. If there is an unprocessed division point, the process proceeds to step 33. If there is no unprocessed division point, a processing auxiliary line generation process is performed. End (step 32). That is, the arithmetic processing unit 13 repeatedly executes the processing from step 33 onward, determines whether or not to generate machining auxiliary lines for all division points, and generates data of machining auxiliary lines.

  Next, with respect to the offset line for creating processing auxiliary line data, data of a circle passing through the dividing point and in contact with the offset line is created (step 33). At this time, the arithmetic processing unit 13 sets the center of the circle on the anti-cut object side with respect to the offset line. That is, the center of the circle is set so that the circle to be created at the bottleneck or turning angle is in contact with the two offset lines. The circle has a preset value, the diameter of the cutting tool set immediately before, or a diameter sufficiently larger than the diameter of the cutting tool set at that time. For example, a 150φ (diameter 150 mm) circle is drawn by adding a specified amount to the 40φ (diameter 40 mm) tool set immediately before. The specified amount is determined in advance by a LUT (Look Up Table) and a predetermined mathematical expression (for example, 3.5 times the tool diameter) depending on the size of the tool. Then, it is determined whether or not the drawn circle intersects or intersects with the offset line in the traveling direction (step 34), and if it intersects, the size of the circle is reduced so as to contact the offset line (step 35). . If the circle and the offset line do not intersect, the calculation reference is moved to the next division point, and the processing from step 33 to step 35 is repeated.

In step 32, the arithmetic processing unit 13 proceeds to the next program step 24 after completing the processing of steps 33 to 35 for all the dividing points.
The division point in step 31 is set as a position where the thrusting device 15 performs normal-time thrusting. On the other hand, when a narrow turning angle and a narrow path having a predetermined diameter or less are formed in a state where the offset line is drawn, the first processing position using the data of the processing auxiliary line and the data of the offset line are used. The butt machining position calculation as the machining position 2 is applied.

  The circle drawn by the arithmetic processing unit 13 is, for example, a circle O1 having a predetermined diameter of 150φ passing through the predetermined division point P1, and when the circle O1 is in contact with or does not intersect with another offset line Lk (see FIG. 5A). The division points are stored in the piercing path database DB3 as piercing path data. On the other hand, when the circle O1 having a predetermined diameter of 150φ passing through the drawn predetermined dividing point P2 and the offset line Lk intersect with each other, it is determined that a narrow turning angle and a narrow path are formed at the tip of the predetermined dividing point P2. be able to. When the circle O1 drawn on the arithmetic processing unit 13 intersects the offset line Lk, the size of the predetermined diameter is gradually reduced to a circle O2 having a size in contact with the offset line Lk (FIG. 5B). reference). Since the circle drawn on the data calculated by the arithmetic processing unit 13 is used in the subsequent determination of the butt machining position, it is stored in a first storage device (not shown).

FIG. 4 shows a sub-step of step 25 for determining the thrusting position and the descending depth.
Through the processing depicted in the flowchart shown in FIG. 3, data of the processing auxiliary line Lh (hereinafter, processing auxiliary line data) is stored in the first storage device. The arithmetic processing unit 13 reads the processing auxiliary line data Lh based on the circle O2 stored in the storage device, and divides the processing auxiliary line Lh on the processing auxiliary line Lh (e.g., equal division of the entire circle or equal division between the contacts, such as FIG. The evaluation score Pc to be obtained is generated (step 41). Next, it is determined whether or not there is an unprocessed division point on the offset line Lk. If there is an unprocessed division point, the process proceeds to step 43. If there is no unprocessed division point, processing is performed. The generation process of the auxiliary line Lh is terminated (step 42). That is, the arithmetic processing unit 13 repeatedly executes the processing from step 43 onward, determines whether or not to generate the machining auxiliary line Lh for all the division points related to the offset line Lk, and the data of the machining auxiliary line Lh. Generate.

  The arithmetic processing unit 13 creates a line (perpendicular to the z-axis direction) that passes through the evaluation point and is parallel to the machining axis as data necessary for calculation (step 43), and the intersection of the vertical line and the surface of the workpiece W Is stored as a machining start position in the butt machining path database DB3 (step 44). Then, it is determined whether or not the cutting tool C overlaps with the cutting region Wd and can be cut (step 45). In this step 45, when there is an overlap between the cutting area Wd and the cutting tool C, the depth (lowering depth) at which piercing is performed is determined using shape data obtained from CAD data stored in the shape database DB1. . If there is no overlapping area between the cutting area Wd and the cutting tool C, the evaluation point Pc on the line segment of the next circle O2 is not determined as the cutting position (steps 43 to 45). Move on.

  The arithmetic processing unit 13 divides the evaluation point created on the processing auxiliary line data Lh by, for example, the pitch width, and the distance between the reference point and the point connected to the circle similarly to the reference point is within the pitch width. Calculation is performed using an operation that divides into equal intervals. Then, the arithmetic processing unit 13 stores the calculated data in a second storage device (not shown). Next, the arithmetic processing unit 13 reads out the evaluation point data stored in the storage device, and determines whether or not it corresponds to the position where the piercing process is performed. When the arithmetic processing unit 13 determines that the cutting tool C of the punching device 15 hits the cutting area Wd of the workpiece W that is a material, the arithmetic processing unit 13 determines that the predetermined evaluation point Pc is a position to perform the punching, and The evaluation point Pc is stored in the butt machining path database DB3 as one of the path data. An example of the points P1 and P2 as the stored piercing path data is shown in FIG. Furthermore, the depth by which the cutting tool C is lowered from the shape of the workpiece W is calculated, and the lowered depth is also stored in the thrusting path database DB3. After the processing for the evaluation point on the processing auxiliary line Lh is completed, the process returns to the step of evaluating the dividing point on the offset line Lk shown in FIG. 3, and the size of the circle O2 serving as the processing auxiliary line Lh is further reduced to the circle O3. The same process is repeated (see FIG. 5E).

  The steps shown in FIGS. 2 to 4 can obtain data for controlling the thrusting device 15, which generates control data based on the thrusting path data generated by the CAD device 12. The punching process is controlled. FIG. 6 shows an example of the piercing control using the piercing path generated using the data of the processing auxiliary line Lh.

  FIG. 6A shows the workpiece W and its cutting area Wd. The workpiece W and the cutting area Wd are separated by a shape model line Ls as a product. An offset line Lk drawn from the shape model line Ls to a position away from the workpiece W with a value larger than the diameter of the cutting tool C to be machined is calculated by the arithmetic processing unit 13. Further, the arithmetic processing unit 13 draws the machining auxiliary line Lh (see FIG. 6B), and divides the part having no problem in the normal thrusting process by the pitch width, and the curved part of the machining auxiliary line Lh is the curved part. The piercing positions divided at equal intervals below the pitch width (see FIG. 6C) are set. The thrusting device 15 performs the thrusting based on the processing data generated by the CAD device 12, that is, the thrusting positions P1 to P10 read from the thrusting path database DB3.

  The order of cutting in the thrusting device 15 is shown in FIGS. 6 (d) to 6 (g). Similarly, the arithmetic processing unit 13 projects a division point determined with respect to a machining auxiliary line drawn based on a circle having a small diameter (see FIG. 6H). Thereby, the piercing position P8 at an acute angle formed in the cutting region Wd of the workpiece W is cut by the cutting tool C, and subsequently pierced in the order shown in FIG. 6 (i). A portion that becomes a turning angle so that the load applied to the cutting tool C is substantially uniform (so that the amount to be cut from the cutting region Wd is equal to or less than a certain amount), and so that the load is not excessively applied (FIG. 6 (f ))), It can be seen that the piercing is devised so that the piercing positions P4 to P6 are added based on the machining auxiliary line Lh having a large diameter.

  In FIG. 6, the machining auxiliary line Lh is calculated based on the pitch width, and a machining path is created from the two machining auxiliary lines Lh. However, the machining auxiliary line Lh has three lines if the diameter of a preset circle is large. 7 and FIG. 8, the case where a plurality of processing auxiliary lines Lh are created in the arithmetic processing of the arithmetic processing unit 13 and stored in the first storage device will be described.

FIG. 7 shows an example in which three processing auxiliary lines Lh corresponding to a right-angle cutting region Wd are created.
In this case, the cutting procedure in which the thrusting device 15 performs the thrusting is indicated by the numbers indicated in the drawing. A normal thrusting position (not shown) divided by the pitch width is cut, and the machining auxiliary line Lh1 having the largest diameter is preferentially cut at the thrusting position. That is, as shown in FIG. 7, the piercing positions P1 to P5 on the machining auxiliary line Lh1 having the largest diameter and the piercing positions P6 to P9 on the machining auxiliary line Lh2 having the next largest diameter are arranged in this order. Thrusting is performed. Then, the piercing is performed in the order of the piercing positions P10 to P12 on the machining auxiliary line Lh3 having the smallest diameter, the corner piercing position P13, and the normal piercing position.

  FIG. 8 shows an example in which four machining auxiliary lines Lh1, Lh2, Lh3, and Lh4 are created for the cutting area Wd having a bottleneck shape. Similar to the cutting procedure of FIG. 7, the piercing is performed according to the numbers indicated in the drawing. The normal piercing positions P1 and P2 divided by the pitch width are sequentially cut, and the cutting auxiliary line having a large diameter is preferentially cut at the piercing position. That is, as shown in FIG. 8, the piercing positions P3 to P6 on the machining auxiliary line Lh1 having the largest diameter and the piercing positions P7 to P9 on the machining auxiliary line Lh2 having the next largest diameter are arranged in this order. Thrusting is performed. And in order of the piercing positions P10 to P12 on the processing auxiliary line Lh3 having a smaller diameter, the piercing position P13 on the processing auxiliary line Lh4 having the smallest diameter, and the normal piercing positions P14 and P15. Thrusting is performed.

  A portion of the cutting area Wd that could not be cut by a single piercing process is switched to a tool having a smaller cutting diameter later to form a piercing path in the same manner, and approaches a completed shape as a mold. As described above, according to the present invention, the piercing path can be automatically calculated by the calculation of the arithmetic processing unit 13, and the piercing apparatus 15 can be given the piercing path to control the piercing apparatus 15.

Next, characteristic actions and effects of the present embodiment will be described.
(1) A processing auxiliary line Lh that connects two points before and after the moving direction of the cutting tool C mounted on the thrusting device 15 is generated at a location where the offset data Lk of the workpiece W forms a bottleneck or a turn. The machining auxiliary line Lh is stored in the shape database DB1. Then, after the cutting tool C has passed the first machining position arranged at a predetermined interval along the machining auxiliary line Lh, the second machining arranged at a predetermined interval along the offset data Lk between the two points. And the first machining position and the second machining position are stored in the parameter file database DB2. Further, the cutting tool C is driven so that the workpiece W is cut by the cutting tool C moved to the first machining position and then cut by the cutting tool C moved to the second machining position. For this purpose, the machining path data is created and stored in the machining path database DB3.

  According to this configuration, the machining auxiliary line Lh is created, and set on the machining contour line by cutting the workpiece W at the first machining position set by the machining auxiliary line Lh according to the generated machining data. Thus, the cutting load on the second machining position is reduced, and the machining and data correction by the operator are not required, and the machining speed and productivity are improved. Accordingly, it is possible to provide a machining data generation method capable of extending the life of the rotary tool by reducing the cutting load and further automatically operating the second machining position where the cutting load of the cutting tool becomes high. it can.

  (2) In the auxiliary line segment generation step, an arc calculated using a function for drawing a predetermined line segment is set as the processing auxiliary line Lh. Since the tool path can be generated after the arc processing auxiliary line Lh is drawn using the function, the computer can automatically execute this process.

  (3) In the auxiliary line segment generating step, the processing auxiliary line Lh is generated so as to be in contact with the offset data Lk at the two points. As a result, the computer that automatically generates the machining auxiliary line Lh so as to contact the offset data Lk at two specific points can execute this process and automatically generate the tool path data.

  (4) In a predetermined region including a specific location, a division point is set for dividing the offset line Lk on the front side in the moving direction of the cutting tool C with respect to the location, and a circle with a predetermined diameter passing through the division point is set. . It is determined whether or not the circle intersects or touches the offset line Lk on the rear side in the moving direction of the cutting tool C with respect to the portion, and when the circle intersects, the circle touches the offset line Lk. The diameter is adjusted, and the point of contact with the circle that contacts the offset line Lk is two points before and after the cutting tool C in the moving direction, and the arc between the two points in the circle is the processing auxiliary line Lh. For this reason, the machining auxiliary line Lh can be formed using the circular shape, and the cutting position and the tool path data of the cutting tool C can be automatically generated. By using the tool path data, the cutting of the cutting tool C can be performed. It is possible to automatically reduce the load on a portion with a high load.

  (5) A plurality of division points are set, and for each division point, the machining auxiliary line Lh is set and the first machining position is set on the machining auxiliary line Lh. A tool path to be processed can be formed, and the load on the cutting tool C can be reduced.

  (6) If a circle with a predetermined diameter does not intersect with or touch the offset line Lk, the process for the division point is skipped. In places where there is no bottleneck or turning angle, an extra tool path is not formed by skipping the processing on the area where the workpiece W is not present, and a reduction in cutting speed in the thrusting device 15 can be suppressed.

The embodiment of the present invention may be modified as follows.
In the above embodiment, the processing auxiliary line Lh is not simply an arc, but a function that draws a curve such as a parabola, a cycloid curve, or a trochoid curve may be used. By substituting the coordinate value of the division point and the pitch interval into the formula of the machining auxiliary line determined by substituting the coordinate value of the division point into the function, the coordinate value of the second machining position is obtained.

FIG. 9 shows an example in which the arithmetic processing unit 13 draws the machining auxiliary line Lh using a trochoid curve.
In this case, it is assumed that the arithmetic processing device 13 passes through two points P1 and P10 separated by a predetermined interval, and the center point Tc is on a perpendicular calculated from the two points P1 and P10. Then, a second circle T2 that is sufficiently larger than a preset tool diameter is created. Of the dividing points P1 and P10, for example, the second circle is drawn in the direction of the arrow with the trochoidal curve LT marked at the tip of the broken line, starting from the dividing point P1 on the front side in the advancing direction as the cutting order. By using the drawn curve as the processing auxiliary line Lh, the processing auxiliary line Lh using a curve function can be obtained.

  Further, the processing auxiliary line Lh calculated by the computer is set so that the offset line Lk and the two points are in contact with each other. If a large metal meat is pierced with a small cutting tool C, a necessary portion is not scraped off.

  In the above embodiment, the thrusting device 15 is a separate device that performs thrusting based on the processing data generated by the CAD device 12, but is the same processing unit as the thrusting device 15 equipped with the CAD device 12. The present invention may be implemented as one device that uses.

The schematic block diagram of a thrusting apparatus. The flowchart which shows the process until a thrust process position determination. The flowchart which shows a process auxiliary line creation process. The flowchart which shows the process until the butt cutting position determination of a process auxiliary line site | part. (A)-(e) is explanatory drawing which shows the process until a process auxiliary line creation process and a thrust position determination. (A)-(i) is explanatory drawing which shows the order of thrusting. Explanatory drawing which shows another thrusting position. Explanatory drawing which shows another thrusting position. Explanatory drawing which shows another process auxiliary line creation process. Explanatory drawing which shows the conventional thrusting position.

Explanation of symbols

  W ... Workpiece, DB1 ... Shape database, DB2 ... Parameter file database, DB3 ... Butting process path database, Lh, Lh1, Lh2, Lh3, Lh4 ... Machining auxiliary line, 13 ... Control device, 15 ... Butting device.

Claims (4)

The rotary tool is moved along the machining contour corresponding to the shape model representing the product shape, and the workpiece is moved along the rotational axis direction at the machining position set on the machining contour. A machining data generation method for generating data for driving a thrusting device for cutting a machine by a computer,
Auxiliary line segment generating step of generating a machining auxiliary line connecting two points before and after the moving direction of the rotary tool with respect to a location where the machining contour forms a bottleneck or a turn, and storing the machining auxiliary line in a storage device When,
The second machining position arranged at a predetermined interval along the machining contour line between the two points after the rotary tool has passed through the first machining position arranged at a predetermined interval along the auxiliary machining line. And a machining position calculating step for storing the first machining position and the second machining position in the storage device, and
The rotary tool is driven so that the workpiece is cut by the rotary tool moved to the first machining position and then cut by the rotary tool moved to the second machining position. A data generation step of creating data to be stored and storing the data in a storage device;
I have a,
In the auxiliary line segment generation step,
In a predetermined area including the location, set a dividing point for dividing the machining contour on the near side in the moving direction of the rotary tool with respect to the location,
Set a circle with a predetermined diameter passing through the dividing point, determine whether the circle intersects or touches the machining contour on the rear side in the moving direction of the rotary tool with respect to the location,
If the circles intersect, adjust the diameter so that the circle touches the machining contour,
A machining data generation method characterized in that a contact point with a circle in contact with the machining contour line is set to two points before and after the moving direction of the rotary tool, and an arc between the two points in the circle is used as the machining auxiliary line. . A plurality of the division points are set, and the machining auxiliary line is set for each of the division points, and the first machining position is set on the machining auxiliary line. machining data generating method according to 1. When said circle of predetermined diameter is not contact and does not intersect the working contour the divided point, according to claim 1 or 2 that skips the process of creating the machining auxiliary line for dividing point, it is characterized by The processing data generation method described in 1. In the auxiliary line segment generation step, a plurality of processing auxiliary lines that are different in length and overlap the processing contour line before and after the location are generated,
In the machining position calculation step, a first machining position is set for each of the plurality of machining auxiliary lines,
In the data generation step, after the cutting is performed by moving the rotary tool to the first processing position on each processing auxiliary line in order from the long processing auxiliary line among the plurality of processing auxiliary lines, The machining data generation method according to any one of claims 1 to 3 , wherein the machining data is generated such that the rotary tool is moved to a second machining position to perform cutting .

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