JP2005271148A - Tool path data generating device and control device having it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for efficiently generating tool path data for chamfering. <P>SOLUTION: This control device 1 includes: a program storage part 10 storing an NC program for chamfering the boundary part between the outer peripheral surface and a recessed curve surface in a workpiece provided with a recessed curve surface having a central axis vertical to the axis of a cylindrical workpiece and formed on the outer peripheral surface and including the respective data about the positional relationship between the axis and the central axis, the outside diameter of the workpiece, an arc shape of the recessed curve surface, the chamfering shape and the shape of a ball end mill (a tool); and a drive control part 14 for setting two or more points on the boundary part on the basis of the respective data in the NC program, calculating the coordinate positions about the preset points, calculating the tool correction vector which is the direction and amount to offset the tool center position from the calculated coordinate position, adding the calculated tool correction vector to the calculated coordinate positions to calculate the tool center position (the tool path data), and sequentially moving the tool to the respective calculated center positions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tool path data generation device that generates tool path data for sequentially moving a ball end mill to a predetermined movement position in order to chamfer a corner portion of a workpiece, and a control including the tool path data generation device. Relates to the device.

  When the workpiece is machined into a predetermined product shape, the corners may become frayed. The burrs are appropriately removed because they cause injury to the operator and are not preferable in terms of the appearance quality of the product.

  In general, these burrs are, for example, an automatic programming device disclosed in Japanese Patent Application Laid-Open No. 2003-177810 or an NC for chamfering that is created in advance by the operator's own hand as follows. According to the program, the corners of the product are automatically removed by chamfering.

  That is, the automatic programming device includes a product shape data storage unit, a material data storage unit, a tool data storage unit, a machining condition data storage unit, a CL data generation unit, an NC program generation unit, and an NC program storage unit.

  The product shape data storage unit stores shape data defining the three-dimensional shape of the product in a state where the chamfered shape is omitted, and data related to the chamfered shape, and the chamfer data includes shape data of a portion to be chamfered and Are related to each other. These shape data and chamfer data are generated using a CAD device or the like.

  The material data storage unit stores data related to the shape and material of the material (workpiece), and the tool data storage unit stores data related to the type, size, and material of the tool, and the machining condition data storage. The section stores data related to machining conditions set according to the material material, tool material, machining process, and the like.

  The CL data generation unit is configured to use a tool (chamfering tool) and the use based on each data stored in the product shape data storage unit, material data storage unit, tool data storage unit, and machining condition data storage unit. CL data (tool path data) including tool movement position, feed speed, rotation speed, etc. is generated. At this time, the part to be chamfered is recognized by referring to the chamfer data correlated with the shape data. Thereafter, a chamfering tool corresponding to the chamfering shape specified by the chamfering data is determined, and thereafter, the movement position of the determined chamfering tool is calculated and set to generate the CL data.

  The NC program generation unit generates an NC program based on the CL data generated by the CL data generation unit and stores the NC program in the NC program storage unit.

  On the other hand, when the operator manually creates the chamfering tool, the movement position of the chamfering tool is calculated and set by performing the same operation as the processing of the CL data generation unit. Then, a chamfering tool corresponding to the recognized chamfering shape is determined, then the movement position of the determined chamfering tool is calculated and set, and an NC program is created from the calculated and set movement position.

The moving position of the chamfering tool represents the tool center position set for each tool, and when calculating and setting the center position, first the outer shape (contour) shape (coordinate position) of the product is calculated. After that, the calculated outer shape is calculated by offsetting the calculated outer shape by a predetermined amount in a predetermined direction according to the tool diameter and the chamfered shape. This is not a chamfered shape, but will be described with a simple example. As shown in FIG. 15, when the outer shape of the workpiece 61 is processed using a φA tool 60, the center position of the tool 60 is set at each vertex. The positions are offset by d ₁ , d ₂ , d ₃ , and d ₄ . These d ₁ , d ₂ , d ₃ , and d ₄ are referred to as tool correction vectors at each vertex.

JP 2003-177810 A

  By the way, the part to be chamfered is, for example, as shown in FIGS. 2 to 4, the outer peripheral surface and the concave part of a cylindrical workpiece 50 having a concave part 51 having an arcuate concave curved surface 52 formed on the outer peripheral surface. 51, the boundary between the outer peripheral surface and the concave curved surface 52 is a three-dimensional curve. The concave curved surface 52 is formed in an arc shape having a radius of curvature R having a central axis 50 b perpendicular to the axis 50 a of the workpiece 50.

  Therefore, when the operator himself creates the NC program manually, the tool correction vector cannot be easily calculated for the boundary portion between the outer peripheral surface and the concave curved surface 52, so the tool center position as the tool movement position is calculated. , It is difficult to set.

  Even when an automatic programming device is used, the processing contents become sophisticated and complicated for the reasons described above, so that the chamfering function for such a three-dimensional curved portion may not be provided, Since shape data and chamfering data are necessary, when there is no such data, it must be generated. Further, it is premised that expensive equipment such as a CAD device or the automatic programming device is provided.

  From the above, conventionally, burrs generated at the boundary between the outer peripheral surface of the workpiece 50 and the recess 51 are often removed manually, which is not efficient.

  The present invention has been made in view of the above circumstances, and is a tool path data generation device capable of efficiently generating tool path data for chamfering a workpiece corner by a simple operation, and It is an object of the present invention to provide a control device provided with this.

To achieve the above object, the present invention provides:
Chamfering is performed on at least the boundary between the outer peripheral surface and the concave curved surface of a workpiece formed in a cylindrical shape and having an arc-shaped concave curved surface having a central axis perpendicular to the axis on the outer peripheral surface. Accordingly, a ball end mill as a tool is defined by a first axis parallel to the axis, a second axis parallel to the central axis, and three orthogonal axes that are perpendicular to both the first and second axes. Tool path data for sequentially moving to preset movement positions in the three-dimensional space to be generated, and generating tool path data including at least the center position of the ball end mill tip spherical surface portion that is the respective movement positions In the device
Data relating to the positional relationship between the axis and the central axis in the three-dimensional space, data relating to the outer diameter of the workpiece, data relating to the arc shape of the concave curved surface, data relating to the chamfering shape, and data relating to the shape of the ball end mill. A condition data storage unit storing at least data;
A tool path data generating unit that generates the tool path data based on each data stored in the condition data storage unit, wherein a plurality of points are set on the boundary part, and for each of the set points, the 3 A process for calculating a coordinate position in a dimensional space, and a tool correction that is a direction and amount in which the center position of the ball end mill should be offset from the coordinate position in order to make the boundary portion the chamfered shape at the calculated coordinate position A process of calculating a vector and a process of calculating the center position of the ball end mill by adding the calculated tool correction vector to the calculated coordinate position and generating the tool path data including each calculated center position And a tool path data generation unit that includes a tool path data generation unit.

  According to the present invention, the coordinate positional relationship between the axis of the workpiece and the central axis of the concave surface, the data on the positional relationship in the three-dimensional space such as the distance between the axis and the central axis, the diameter of the workpiece, Data related to the outer diameter such as radius, data related to the arc shape such as the radius of curvature of the concave curved surface, data related to the shape such as the cut amount and curvature radius of the chamfered portion, the radius of curvature of the tip spherical portion of the ball end mill and the tip spherical portion Data relating to the shape such as the center position (hereinafter referred to as the center position of the ball end mill) is stored at least in the condition data storage unit in advance.

  In the tool path data generation unit, a ball in a three-dimensional space for processing the boundary portion between the outer peripheral surface of the workpiece and the concave curved surface into the chamfered shape based on each data stored in the condition data storage unit. Tool path data including at least the center position (movement position) of the end mill is generated.

  Specifically, a plurality of points are set on the boundary, a process of calculating a coordinate position in a three-dimensional space for each set point, and the boundary at the calculated coordinate position is defined as the chamfer shape. To calculate the tool correction vector, which is the direction and amount in which the center position of the ball end mill should be offset from the coordinate position, and to calculate the center position of the ball end mill by adding the calculated tool correction vector to the calculated coordinate position. The calculation process is executed, and the tool path data including the calculated center positions and sequentially moving the ball end mill to the calculated center positions is generated.

  The tool path data generation unit may be configured to simply set the plurality of points as follows. That is, the tool path data generation unit sets and sets a plurality of division points at predetermined intervals in the circumferential direction on an arc obtained by projecting the boundary portion onto the second axis-third axis plane. The plurality of points having the same coordinate position in the second axis direction and the third axis direction as the coordinate position of each division point are configured to be set on the boundary portion.

Further, the present invention provides a structure for holding the workpiece, a structure for holding the ball end mill, and a structure that is movably disposed among these structures to move the workpiece and the ball. A control device that is provided in a machine tool that includes at least a feed mechanism unit that relatively moves an end mill in the three orthogonal directions, and controls the operation of the feed mechanism unit;
Comprising the tool path data generating device,
Based on the tool path data generated by the tool path data generating device, the structure is moved by controlling the operation of the feed mechanism, and the ball end mill is sequentially moved to the respective center positions. The present invention relates to a control device.

  According to this invention, the operation of the feed mechanism is controlled by the control device based on the tool path data generated by the tool path data generation device, and the structure and / or the ball end mill that holds the workpiece is held. The structure is moved, and the ball end mill is moved sequentially to each central position. Thereby, the boundary part of the outer peripheral surface of a workpiece | work and a concave curved surface is chamfered.

  Thus, according to the tool path data generating device according to the present invention, the tool path data generating unit can perform the work of storing predetermined simple data in the condition data storage unit, and the outer peripheral surface and the concave curved surface of the workpiece. Since the tool path data for chamfering the boundary between the tool path data and the tool path data is automatically generated, the tool path data can be generated efficiently and easily. Further, as in the prior art, expensive facilities such as a CAD device and an automatic programming device are not required.

  Further, when setting a plurality of points on the boundary portion, the processing contents in the tool path data generating portion can be simplified by simply setting the points. As a result, even if the chamfering accuracy is slightly lowered, the chamfering is performed for removing burrs.

  In addition, according to the control device of the present invention, the tool generated by the tool path data generation device under the control of the control device can be performed simply by inputting predetermined simple data to the tool path data generation device. Since the ball end mill and the workpiece can be moved relative to each other based on the path data, the chamfering can be efficiently performed.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a schematic configuration of a control device and the like according to an embodiment of the present invention.

  As shown in FIG. 1, the control device 1 of this example includes a program storage unit 10, a program analysis unit 11, a generation data storage unit 12, a tool data storage unit 13, and a drive control unit 14, for example, a machining center 20. Control the operation of

  The machining center 20 includes a bed, a column disposed on the bed, a spindle head supported by the column and movable in the vertical direction (Z-axis direction), and an axis parallel to the Z-axis. A spindle supported rotatably by the spindle head, a table disposed on the bed and movable in two directions (X-axis direction and Y-axis direction) orthogonal to each other in a horizontal plane, and the table in the X-axis direction X-axis feed mechanism 21 and Y-axis feed mechanism 22 that move in the Y-axis direction, Z-axis feed mechanism 23 that moves the spindle head in the Z-axis direction, and spindle motor 24 that rotates the spindle around the axis. Etc., and the operations of the feed mechanisms 21, 22, 23 and the spindle motor 24 are controlled by the control device 1.

  A ball end mill as a tool is held on the main shaft, and a cylindrical workpiece 50 as shown in FIGS. 2 to 4 is placed on the table with its axis 50a parallel to the X axis. As shown in the figure, this work 50 has a concave portion 51 on the upper surface of the outer periphery, and concave curved surfaces 52 having a radius of curvature R each having a central axis 50b parallel to the Y axis are formed at both ends of the concave portion 51, respectively. ing.

  The program storage unit 10 stores an NC program created in advance. This NC program is for processing the boundary portion between the outer peripheral surface of the workpiece 50 and the concave portion 51 into a chamfered shape as shown in FIG. 5 and appropriately processing other portions into a predetermined shape. In this example, when the angle of the boundary portion is β, the boundary portion is processed into a chamfered shape in which the chamfering angle is α and the linear length in the chamfering angle direction is C. In FIG. 5, the symbol r indicates the radius of curvature of the chamfered portion, that is, the radius of curvature of the tip spherical portion of the ball end mill T.

  The data structure (command code) of the NC program for chamfering is as shown in FIG. 6, and the command part of G ***, followed by XXX, Y **, Z **. , D **, R **, L **, W **, C **, J **, E **, B **, and F **, and a condition data portion relating to chamfering.

  Here, as shown in FIGS. 3 to 5, XX is the coordinate position of the central axis 50 b of the concave curved surface 52 in the X-axis direction, and Y ** is the coordinate of the axis 50 a of the workpiece 50 in the Y-axis direction. Z ** is the coordinate position of the central axis 50b in the Z-axis direction, D ** is the diameter of the workpiece 50, R ** is the radius of curvature R of the concave curved surface 52, and L ** is The distance in the Z-axis direction between the center axis 50b and the axis 50a, W ** is the distance in the X-axis direction between the center axes 50b, and C ** is the straight line length in the chamfer angle direction. * Indicates a split angle (Δθ), which will be described later, and E ** indicates the relationship between the formation direction of the recess 51 and the XX and Y ** as shown in FIG. 7 (in this example, (a ), B ** is the correction number of the ball end mill T corresponding to the radius of curvature r of the chamfered portion, and F ** is the cutting number. It is the data which shows each feed rate. The program storage unit 10 also functions as a condition data storage unit according to the claims in which various condition data for chamfering are stored.

  The program analysis unit 11 analyzes the NC program stored in the program storage unit 10 and performs operation commands related to the spindle head and table movement position and feed speed, the rotation speed of the spindle motor 24, and chamfering. A command code is extracted, and the extracted operation command and command code are transmitted to the drive control unit 14.

  The generated data storage unit 12 stores a program for performing chamfering in advance, and the tool data storage unit 13 stores data relating to a tool for machining the workpiece 50 (tool diameter (in the case of the ball end mill T). 12, the curvature radius r of the tip spherical surface portion, the center position of the tip spherical portion (hereinafter referred to as the center position of the ball end mill) Q), the tool length, and the like) are associated with the correction number. And stored in advance for each tool.

  The drive control unit 14 receives the operation command transmitted from the program analysis unit 11, and performs a process of controlling the movement of the table, the spindle head, the rotation of the spindle, and the like based on the received operation command. Specifically, for movement of the table and spindle head, a control signal is generated based on the current position data of the table and spindle head fed back from each of the feed mechanism units 21, 22, and 23 and the operation command. The generated control signal is transmitted to each of the feed mechanisms 21, 22, and 23 to control it. Further, for the rotation of the main shaft, a control signal is generated based on the current rotation speed data fed back from the main shaft motor 24 and the operation command, and the generated control signal is transmitted to the main shaft motor 24 to control it.

  When the drive control unit 14 receives the command code transmitted from the program analysis unit 11, the drive control unit 14 reads out the program stored in the generated data storage unit 12 and executes a series of processes as shown in FIG. A boundary portion between the outer peripheral surface of 50 and the recess 51 is chamfered. Specifically, first, each of the data included in the command code is recognized, and the shape of the ball end mill (tip) is determined by referring to the data stored in the tool data storage unit 13 based on the recognized correction number. The radius of curvature r of the spherical surface portion, the center position Q of the tip spherical surface portion, the tool length, and the like are recognized (step S1).

Next, as shown in FIG. 9, a line and said through an outer peripheral surface and the boundary portion between the concave surface 52 of the circular arc obtained by projecting on the Y-axis -Z axis plane start point P ₀ and the axis 50a of the workpiece 50 The angles θ ₁ and θ ₂ in the Y axis-Z axis plane between the line passing through the arc end point P ₁₀ and the axis 50 a and the line passing through the axis 50 a of the workpiece 50 and parallel to the Y axis are calculated (step S 2). ).

Next, the table and the spindle head are moved, and the ball end mill is moved to a predetermined position (for example, the coordinate position specified by XX and Y ** and spaced from the bottom surface (upper surface) of the recess 51 of the workpiece 50 by a certain distance. After positioning to the upper position (step S3), θ is set to θ ₁ (step S4).

Thereafter, the coordinate position of the start point P _{0 in} the Y-axis / Z-axis plane is calculated, and the coordinate position in the X-axis direction of the point P ₀ ′ on the boundary corresponding to the start point P ₀ is calculated (step S5) Next, a tool correction vector indicating the direction and amount in which the center position Q of the ball end mill T is to be offset from the calculated coordinate position in order to make the boundary portion a predetermined chamfered shape at the calculated coordinate position is calculated. (Step S6).

The tool correction vector can be calculated as follows, for example. That is, assuming that the radius (D / 2) of the workpiece 50, the radius of curvature R, and the distance L are equal and the chamfering angle α is 45 °, first, as shown in FIG. In the plane, the angle between the line connecting the axis 50a of the workpiece 50 and the point P _n (n = 0 to 10) on the boundary and the line passing through the axis 50a and parallel to the Y axis is θ _C , Y a tool compensation vector n in the axial -Z axis plane through the point P _n on the boundary, and the angle between a line parallel to the Y-axis theta _Y, as shown in FIG. 11, X-axis -Z axis plane , The angle between the line connecting the central axis 50b and the point P _n ′ (n = 0 to 10) on the boundary portion and the line passing through the central axis 50b and parallel to the Z axis is θ _D and the X axis The angle between the tool correction vector M on the Z-axis plane and a line passing through the point P _n ′ on the boundary and parallel to the X axis is θ _X The angles θ _Y and θ _X are defined as θ _X = 45 ° when θ _D = 90 °, θ _Y = 45 ° when θ _C = 0 °, θ _X = 90 ° when θ _D = 0 °, When θ _C = 90 °, it is simply defined as Equation 1 and Equation 2 so as to satisfy the relationship of θ _Y = 90 °.

  Moreover, as shown in FIG. 12, there exists a relationship as shown in Formula 3 among the ball end mill T, the tool correction vector d, and the chamfered shape.

  Further, as shown in FIG. 13, if each component of the tool correction vector d in the X-axis, Y-axis, and Z-axis directions is dx, dy, and dz, the following formulas 4 to 7 are obtained. There is a relationship.

  Then, when Formula 4 to Formula 7 are modified, Formula 8 is obtained. Based on Formula 8 and Formulas 1 to 3, the components dx, dy, and dz of the tool correction vector d can be calculated. .

  After the tool correction vector is calculated in this way, the calculated tool correction vector (dx, dy, dz) is added to the calculated coordinate position to calculate the center position of the ball end mill (step S7). Based on the calculated center position and the table and the current position data of the spindle head fed back from each of the feed mechanism sections 21, 22, 23, a control signal is generated and transmitted to each of the feed mechanism sections 21, 22, 23. Then, the ball end mill is moved to the calculated center position (step S8).

Thereafter, while adding the division angle Δθ for dividing the circular arc obtained by projecting the boundary portion onto the Y-axis-Z-axis plane at a predetermined interval to θ, until θ becomes θ ₂ , step S5 -The process of step S8 is repeated (step S9, step S10). That is, the coordinate position at each point (P _{1 to} P ₁₀ and P ₁ ′ to P ₁₀ ′) is calculated, and the tool correction vector at the calculated coordinate position is calculated to calculate the center position of the ball end mill. Then, the ball end mill is sequentially moved to the calculated center position, and the boundary portion between the outer peripheral surface of the workpiece 50 and the concave curved surface 52 is chamfered.

When it is confirmed that θ becomes θ ₂ , the ball end mill is moved in the X-axis direction by the distance between the central axis lines 50b (step S11), and then the outer periphery of the workpiece 50 in the same manner as described above. After moving along the boundary between the surface and the concave curved surface 52 (step S12), and then moving in the X-axis direction by the distance between the central axes 50b (step S13), the above series of processing ends.

  In this way, as shown in FIG. 14, the ball end mill is caused to make one round at the boundary between the outer peripheral surface of the workpiece 50 and the recess 51, and the boundary is chamfered. At this time, the rotation speed and feed speed of the ball end mill are controlled according to the F ** (cutting feed speed) and the like. The drive control unit 14 also functions as a tool path data generation unit as described in the claims, and the program storage unit 10 and the drive control unit 14 include the tool path data device as described in the claims. Function as.

  According to the control device 1 of the present example configured as described above, a command code including various condition data related to the chamfering for chamfering the boundary between the outer peripheral surface of the workpiece 50 and the recess 51 is When the program analysis unit 11 extracts the NC program created in advance and transmits it to the drive control unit 14, the drive control unit 14 sets a plurality of points on the boundary portion, and sets each point. Each time, the coordinate position is calculated first, and then the direction and amount in which the center position of the ball end mill should be offset from the calculated coordinate position in order to make the boundary portion a predetermined chamfered shape at the calculated coordinate position. A tool correction vector is calculated, and then the calculated tool correction vector is added to the calculated coordinate position to calculate the center position of the ball end mill. The ball end mill is moved to the center position.

  Thereby, the ball end mill is sequentially moved to the calculated center position corresponding to each of the set points, and the boundary portion between the outer peripheral surface of the workpiece 50 and the concave curved surface 52 is chamfered. Thereafter, the ball end mill moves along the bottom surface (upper surface) corner of the recess 51, the boundary corner between the outer peripheral surface and the concave curved surface 52, and along the corner of the bottom surface (upper surface) of the recess 51, along the contour of the recess 51. The entire area of the boundary between the outer peripheral surface of the workpiece 50 and the recess 51 is chamfered.

  As described above, according to the control device 1 of this example, the boundary between the outer peripheral surface of the workpiece 50 and the concave curved surface 52 can be obtained by the drive control unit 14 only by creating an NC program including predetermined simple data. Since the movement position (tool center position) (tool path data) to be moved by the ball end mill is automatically generated in order to chamfer the corner 51 of the recess including the section, the tool path data can be generated efficiently and easily. can do. Further, as in the prior art, expensive facilities such as a CAD device and an automatic programming device are not required.

Further, by setting the points P _n at predetermined angular intervals on an arc obtained by projecting the boundary between the outer peripheral surface of the workpiece 50 and the concave curved surface 52 on the Y-axis / Z-axis plane, the point P _n is set on the boundary. A plurality of points are simply set, and the angle θ _Y of the tool correction vector N in the Y axis-Z axis plane and the angle θ _X of the tool correction vector M in the X axis-Z axis plane are simply defined. Therefore, the processing content in the drive control part 14 can be simplified. As a result, even if the chamfering accuracy is slightly lowered, the chamfering is performed for removing burrs.

  Further, the drive control unit 14 performs chamfering by moving the ball end mill and the workpiece relative to each other on the basis of the tool path data generated according to the command code including predetermined simple data in the NC program. It is not necessary to provide a command relating to the moving position of the tool in the NC program, and the chamfering can be performed efficiently, for example, the creation of the NC program can be simplified.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all.

  In the above example, the control device 1 is provided in the machining center 20. However, even if it is provided in an NC lathe, the chamfering can be efficiently performed in the same manner as described above. Further, the shape of the concave portion 51, the chamfered shape, the division angle Δθ, the method for calculating the tool correction vector, and the movement example of the ball end mill are merely examples, and are not limited thereto.

  Furthermore, in the above example, the tool path data generation function is provided in the control device 1. However, the present invention is not limited to this and may be provided in an automatic programming device or the like.

It is the block diagram which showed schematic structure, such as a control apparatus concerning one Embodiment of this invention. It is the perspective view which showed schematic structure of the workpiece | work which concerns on this embodiment. It is the side view which showed schematic structure of the workpiece | work which concerns on this embodiment. It is the top view which showed schematic structure of the workpiece | work which concerns on this embodiment. It is sectional drawing which showed the chamfering shape which concerns on this embodiment. It is explanatory drawing for demonstrating the data structure of NC program. It is explanatory drawing for demonstrating the data structure of NC program. It is the flowchart which showed a series of processes in the drive control part which concerns on this embodiment. It is explanatory drawing for demonstrating calculation of a tool correction vector. It is explanatory drawing for demonstrating calculation of a tool correction vector. It is explanatory drawing for demonstrating calculation of a tool correction vector. It is explanatory drawing for demonstrating calculation of a tool correction vector. It is explanatory drawing for demonstrating calculation of a tool correction vector. It is explanatory drawing which showed an example of the movement locus | trajectory of a ball end mill. It is explanatory drawing for demonstrating a tool correction vector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control apparatus 10 Program memory | storage part 11 Program analysis part 12 Generation | occurrence | production data memory | storage part 13 Tool data memory | storage part 14 Drive control part 21 X-axis feed mechanism part 22 Y-axis feed mechanism part 23 Z-axis feed mechanism part 24 Main shaft motor 50 Work 51 Recessed part 52 Concave surface

Claims (3)

Chamfering is performed on at least the boundary between the outer peripheral surface and the concave curved surface of a workpiece formed in a cylindrical shape and having an arc-shaped concave curved surface having a central axis perpendicular to the axis on the outer peripheral surface. Accordingly, a ball end mill as a tool is defined by a first axis parallel to the axis, a second axis parallel to the central axis, and three orthogonal axes that are perpendicular to both the first and second axes. Tool path data for sequentially moving to preset movement positions in the three-dimensional space to be generated, and generating tool path data including at least the center position of the ball end mill tip spherical surface portion that is the respective movement positions In the device
Data relating to the positional relationship between the axis and the central axis in the three-dimensional space, data relating to the outer diameter of the workpiece, data relating to the arc shape of the concave curved surface, data relating to the chamfering shape, and data relating to the shape of the ball end mill. A condition data storage unit storing at least data;
A tool path data generating unit that generates the tool path data based on each data stored in the condition data storage unit, wherein a plurality of points are set on the boundary part, and for each of the set points, the 3 A process for calculating a coordinate position in a dimensional space, and a tool correction that is a direction and amount in which the center position of the ball end mill should be offset from the coordinate position in order to make the boundary portion the chamfered shape at the calculated coordinate position A process of calculating a vector and a process of calculating the center position of the ball end mill by adding the calculated tool correction vector to the calculated coordinate position and generating the tool path data including each calculated center position A tool path data generation device comprising a tool path data generation unit for performing the above.   In setting the plurality of points, the tool path data generation unit divides a plurality of divisions at predetermined intervals in the circumferential direction on an arc obtained by projecting the boundary on the second axis-third axis plane. A point is set, and the plurality of points having the same coordinate position in the second axis direction and the third axis direction as the coordinate position of each set division point are configured to be set on the boundary portion. 2. The tool path data generation device according to claim 1, wherein A structure that holds the workpiece, a structure that holds the ball end mill, and a structure that is movably disposed among these structures is moved so that the workpiece and the ball end mill are orthogonal to each other. A control device that is provided in a machine tool that includes at least a feed mechanism that moves in the axial direction and controls the operation of the feed mechanism;
The tool path data generation device according to claim 1 or 2,
Based on the tool path data generated by the tool path data generating device, the structure is moved by controlling the operation of the feed mechanism, and the ball end mill is sequentially moved to the respective center positions. A control device characterized by comprising:

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