JP2024055116A - Machining condition setting device and machine tool - Google Patents

Abstract

To provide a machining condition setting device that can set a machining condition for a work-piece even if rigidity of a machining point of the work-piece is unclear, and a machine tool.SOLUTION: A machining condition setting device 5 is provided with: an existing machining condition obtaining part 50 that obtains information concerning an existing machining condition for an existing work-piece; an existing work-piece information obtaining part 51 that obtains information on the existing work-piece; a second machining point-first estimated rigidity value calculating part 52 that calculates a second machining point-first estimated rigidity value R1 (P2) at a second machining point P2, on the basis of the information concerning the existing machining condition at a first machining point P1 of a target work-piece W, existing machining accuracy at the first machining point P1 or information concerning an existing machining accuracy standard and a shape of the target work-piece; and a second machining point-machining condition calculating part 53 that calculates a second machining point-machining condition which is a machining condition for the second machining point P2 of the target work-piece W, on the basis of the second machining point-first estimated rigidity value R1 (P2).SELECTED DRAWING: Figure 7

Description

The present invention relates to a machining condition setting device and a machine tool.

When machining a workpiece using a machine tool, the machining accuracy of the workpiece can be improved by setting machining conditions based on the rigidity at the machining point of the workpiece. Patent Document 1 (JP 2013-71204 A) describes a method for measuring the exact deflection of the grinding part of the workpiece during grinding, and measuring the exact rigidity at the grinding point (an example of a machining point) using the measured deflection amount and grinding resistance.

JP 2013-71204 A

In situations where workpieces are machined based on various machining specifications, accurate information about the rigidity of the machining point is not always available when machining the workpiece. In addition, depending on the shape of the workpiece and the machining conditions, it may not be possible to accurately measure the rigidity of the machining point.

For example, when machining a workpiece with complex machining specifications or under new conditions, it may be necessary to machine the workpiece without any information about the rigidity of the machining point.

The present invention was made in consideration of such problems, and aims to provide a machining condition setting device and a machine tool that can set the machining conditions for a workpiece even when the rigidity of the machining point of the workpiece is unknown.

One aspect of the present invention is
an existing machining condition acquisition unit that acquires information regarding existing machining conditions when an existing workpiece that has already been machined is machined;
an existing work information acquisition unit that acquires information regarding the existing machining accuracy of the existing work or an existing machining accuracy standard required for the existing work;
a second processing point first estimated stiffness value calculation unit that calculates a second processing point first estimated stiffness value that represents a relationship between a predetermined processing force and a deformation amount at a second processing point different from the first processing point among the multiple processing points based on information regarding the existing processing conditions at a first processing point among multiple processing points of a target workpiece to be processed, information regarding the existing processing accuracy or the existing processing accuracy standard at the first processing point, and a shape of the target workpiece;
a second processing point machining condition calculation unit that calculates second processing point machining conditions, which are machining conditions for the second processing point of the target workpiece, based on the second processing point first estimated stiffness value;
The processing condition setting device is provided with:

Another aspect of the present invention is
The present invention relates to a machine tool equipped with the above-mentioned machining condition setting device.

According to one aspect of the present invention, even if the stiffness value of the machining point of the target workpiece is unknown, a first estimated stiffness value of a second machining point at a second machining point different from the first machining point can be calculated based on information on the existing machining conditions at a first machining point among multiple machining points of the target workpiece to be machined, information on the existing machining accuracy or the existing machining accuracy standard at the first machining point, and the shape of the target workpiece. Based on this first estimated stiffness value of the second machining point, the second machining point machining conditions, which are the machining conditions for the second machining point of the target workpiece, can be calculated.

According to another aspect of the present invention, even if the stiffness value of the machining point of the target workpiece is unknown, the machine tool can calculate the second machining point machining conditions, which are the machining conditions for the second machining point of the target workpiece.

FIG. 1 is a block diagram showing a processing condition setting system according to a first embodiment. FIG. 2 is a plan view showing the processing apparatus of the first embodiment. FIG. 2 is a partially enlarged plan view showing a state in which a target workpiece is supported by the machining device according to the first embodiment. FIG. 4 is a partially enlarged plan view showing a state in which the target workpiece in FIG. 3 is deformed; FIG. 4 is a diagram showing the relationship between the rigidity values of the respective disk portions of the target workpiece. A figure explaining an overview of the machining condition settings in embodiment 1, and a graph showing the true stiffness value and the first estimated stiffness value of the second machining point at the first machining point and the second machining point of the target workpiece in embodiment 1. FIG. 2 is a block diagram showing a processing condition setting device according to the first embodiment. 4 is a flowchart showing the operation of the processing condition setting device of the first embodiment. A figure explaining an overview of the machining condition settings in embodiment 2, and a graph showing the true stiffness values at the first machining point and the second machining point of the target workpiece in embodiment 2, as well as the estimated stiffness values of the first machining point and the first estimated stiffness values of the second machining point. FIG. 11 is a block diagram showing a processing condition setting device according to a second embodiment. 10 is a flowchart showing the operation of a processing condition setting device according to a second embodiment. A figure explaining an overview of the machining condition settings of embodiment 3, a graph showing the true stiffness value, the estimated stiffness value of the first machining point, the first estimated stiffness value of the second machining point, and the second estimated stiffness value of the second machining point at the first and second machining points of the target workpiece of embodiment 3, a graph showing a case where the first estimated stiffness value of the second machining point is greater than the second estimated stiffness value of the second machining point. A figure explaining an overview of the machining condition settings of embodiment 3, a graph showing the true stiffness value, the estimated stiffness value of the first machining point, the first estimated stiffness value of the second machining point, and the second estimated stiffness value of the second machining point at the first and second machining points of the target workpiece of embodiment 3, a graph showing a case where the first estimated stiffness value of the second machining point is not greater than the second estimated stiffness value of the second machining point. FIG. 11 is a block diagram showing a processing condition setting device according to a third embodiment. FIG. 13 is a network diagram showing a second knowledge model according to the third embodiment. 10 is a flowchart showing a main routine illustrating the operation of the processing condition setting device of the third embodiment. 13 is a flowchart showing the operation of a stiffness value estimation process according to the third embodiment. 13 is a flowchart showing the operation of a machining condition calculation process according to a third embodiment. FIG. 13 is a block diagram showing a processing condition setting device according to a fourth embodiment. FIG. 13 is a partially enlarged plan view showing a state in which a new target workpiece according to a fourth embodiment is supported by a machining device. 13 is a flowchart showing the operation of a new target machining condition calculation process according to the fourth embodiment. FIG. 13 is a block diagram showing a machine tool according to a fifth embodiment.

(Embodiment 1)
1-1. Configuration of machining condition setting system 1 The configuration of the machining condition setting system 1 of the first embodiment will be described with reference to FIG. 1. The machining condition setting system 1 is applied to the field of machining in which workpieces are machined. The field of machining includes, for example, cutting, grinding, electric discharge machining, and press machining. The machining condition setting system 1 according to this embodiment is a system capable of setting machining conditions for a workpiece in the field of machining when the rigidity of the machining point of the workpiece is unknown.

As shown in FIG. 1, the machining condition setting system 1 includes an input device 2, a database 3, a display device 4, a machining condition setting device 5, and a plurality of machining devices 6. The machining condition setting device 5 forms a network with the plurality of machining devices 6. In other words, the plurality of machining devices 6 and the machining condition setting system 1 are configured to be able to communicate with each other. The machining devices 6 are, for example, grinding machines, lathes, machining centers, milling machines, gear processing machines, boring machines, etc. In this embodiment, a grinding machine will be used as an example for explanation.

1-2. Processing device 6
The processing device 6 according to this embodiment will be described with reference to FIG. 2. In this embodiment, a grinding machine will be described as an example of the processing device 6. However, the processing device 6 is not limited to the grinding machine, and may be a lathe, a machining center, or the like. Any suitable processing machine can be selected, such as a milling machine, a gear processing machine, a boring machine, etc.

The processing device 6 rotates the target workpiece W to be processed around the center line C, rotates the grinding wheel 16 as a tool that is a rotating body, and moves the grinding wheel 16 relatively close to the target workpiece W in a direction that intersects with the axis of the target workpiece W, thereby grinding the outer or inner surface of the target workpiece W. The processing device 6 can be a table traverse type grinding machine, a grinding wheel head traverse type grinding machine, or the like. The processing device 6 can also be a cylindrical grinding machine, a cam grinding machine, or the like.

In this embodiment, the target workpiece W is, for example, a member formed in a shaft shape, and the outer peripheral surface of the target workpiece W is the part to be machined. However, the shape of the target workpiece W is not limited to being shaft-shaped, and can be any shape, such as a cylinder having an inner peripheral surface. If the target workpiece W is cylindrical, the inner peripheral surface of the target workpiece W can be the part to be machined.

The configuration of the processing device 6 will be described with reference to FIG. 2. In this embodiment, the processing device 6 is a cam grinding machine of the wheel head traverse type. However, the processing device 6 can also be of the table traverse type. The processing device 6 mainly comprises a bed 11, a headstock 12, a tailstock 13, a traverse base 14, a wheel head 15, a grinding wheel 16, a sizing device 17, a grinding wheel correction device 18, and a coolant device 19.

The bed 11 is fixed on the installation surface. The headstock 12 is provided on the upper surface of the bed 11, on the near side in the X-axis direction (lower side in FIG. 2) and on one end side in the Z-axis direction (left side in FIG. 2). The headstock 12 supports the target workpiece W so that it can rotate around the Z-axis with the center line C as the center. The target workpiece W is rotated by driving a motor 12a provided on the headstock 12. The tailstock 13 is provided on the upper surface of the bed 11 in a position facing the headstock 12 in the Z-axis direction, that is, on the near side in the X-axis direction (lower side in FIG. 2) and on the other end side in the Z-axis direction (right side in FIG. 2). In other words, the headstock 12 and the tailstock 13 rotatably support both ends of the target workpiece W.

As shown in FIG. 2, the traverse base 14 is provided on the upper surface of the bed 11 so as to be movable in the Z-axis direction. The traverse base 14 is moved by the drive of a motor 14a provided on the bed 11. The grinding wheel head 15 is provided on the upper surface of the traverse base 14 so as to be movable in the X-axis direction. The grinding wheel head 15 is moved by the drive of a motor 15a provided on the traverse base 14. The grinding wheel 16 is rotatably supported on the grinding wheel head 15. The grinding wheel 16 is rotated by the drive of a motor 16a provided on the grinding wheel head 15. The grinding wheel 16 is composed of multiple abrasive grains fixed with a bond material.

The sizing device 17 measures the dimensions (diameter) of the target workpiece W. The sizing device 17 functions as a detector 20 for obtaining the actual cutting depth of the target workpiece W.

The grinding wheel dressing device 18 dresses the shape of the grinding wheel 16. The grinding wheel dressing device 18 is a device that performs truing of the grinding wheel 16. The grinding wheel dressing device 18 may be a device that dresses the grinding wheel 16 in addition to or instead of truing. Furthermore, the grinding wheel dressing device 18 also has the function of measuring the dimensions (diameter) of the grinding wheel 16.

Truing here refers to a reshaping operation, such as shaping the grinding wheel 16 to match the shape of the target workpiece W when the grinding wheel 16 has worn down due to grinding, or removing runout of the grinding wheel 16 due to one-sided wear. Dressing refers to a dressing (sharpening) operation, such as adjusting the amount of protrusion of the abrasive grains and creating the cutting edges of the abrasive grains. Dressing is an operation to correct dulling, clogging, and overflow, and is usually performed after truing.

The coolant device 19 supplies coolant from a coolant nozzle to the grinding point of the target workpiece W by the grinding wheel 16. The coolant device 19 cools the collected coolant to a predetermined temperature and supplies it again to the grinding point. The coolant device 19 is capable of adjusting the flow rate and supply timing of the coolant. In FIG. 2, the reference numeral 19 indicates the position of the coolant nozzle. Although not shown, a temperature sensor that acquires the temperature of the collected coolant may be provided as the detector 20.

1-3. Target workpiece W
An example of the target workpiece W will be described with reference to Fig. 3. As shown in Fig. 3, the target workpiece W includes a cylindrical shaft portion 30 having a long axis in the Z-axis direction, and a plurality of (four in this embodiment) disk portions 31 to 34 arranged on the shaft portion 30. The plurality of disk portions 31 to 34 are, in order from the left in Fig. 3, a first disk portion 31, a second disk portion 32, a third disk portion 33, and a fourth disk portion 34. The first to fourth disk portions 31 to 34 have the same shape and size. The first to fourth disk portions 31 to 34 are arranged coaxially with each other and with the shaft portion 30.

The parts (outer peripheral surfaces) of the first to fourth disk portions 31 to 34 that come into contact with the grinding wheel 16 and are ground by the grinding wheel 16 become the processing points. In FIG. 3, the grinding wheel 16 is shown in contact with the outer peripheral surface of the second disk portion 32. However, the number of processing points is not limited, and one target workpiece W may have 2 to 3, or 5 or more processing points.

Next, a case where the outer peripheral surface of one of the first to fourth disk portions 31 to 34 of the target workpiece W is ground by the grinding wheel 16 will be described with reference to FIG. 4. FIG. 4 illustrates a case where the second disk portion 32 is ground. As shown by the dashed line in FIG. 4, the second disk portion 32 of the target workpiece W is pressed by the grinding wheel 16 from the X-axis direction with a predetermined processing force F, and is deflected by δx in the X-axis direction. However, the amount of deflection is emphasized in FIG. 4.

The target workpiece W is clamped between the headstock 12 and tailstock 13 in the axial direction of the target workpiece W. As a result, the first disk portion 31 and the fourth disk portion 34 located near both ends in the Z-axis direction of the target workpiece W are less likely to bend, while the second disk portion 32 and the third disk portion 33 located near the center in the Z-axis direction are more likely to bend. In other words, the rigidity values of the first disk portion 31 and the fourth disk portion 34 are greater than the rigidity values of the second disk portion 32 and the third disk portion 33. The rigidity value is the quotient obtained by dividing the processing force F by the deformation amount δx when the target disk portion is pressed with a predetermined processing force F and the deformation amount δx of the target disk portion. In other words, the larger the rigidity value, the smaller the deformation amount δx, and the smaller the rigidity value, the larger the deformation amount δx.

The rigidity values of the first to fourth disk portions 31 to 34 will be described with reference to FIG. 5. The rigidity values of the first to fourth disk portions 31 to 34 are affected by the material and shape of the target workpiece W. In addition, the rigidity values of the first to fourth disk portions 31 to 34 are affected by the support positions on the target workpiece W. As shown in FIG. 5, the first disk portion 31 and the fourth disk portion 34 are located toward the ends of the target workpiece W and are close to the headstock 12 and tailstock 13 that support the target workpiece W, so that their rigidity values are relatively large. On the other hand, the second disk portion 32 and the third disk portion 33 are located toward the center of the target workpiece W and are far from the headstock 12 and tailstock 13, so that their rigidity values are smaller than those of the first disk portion 31 and the fourth disk portion 34.

Furthermore, the rigidity values of the first to fourth disk portions 31 to 34 are affected by the structure (center, chuck, etc.) that supports the target workpiece W. Furthermore, the rigidity values of the first to fourth disk portions 31 to 34 are affected by the rigidity of the processing device 6. Examples of the rigidity of the processing device 6 include the rigidity of the headstock 12, the rigidity of the tailstock 13, the rigidity of the grinding wheel 16, and the rigidity of the bed 11. Furthermore, when a rest (not shown) is brought into contact with the target workpiece W, it is also affected by the rigidity of the rest.

1-4. Overview of machining condition setting An overview of the machining condition setting of this embodiment will be described with reference to Fig. 6. In Fig. 6, the horizontal axis indicates the positions of the first machining point P1 and the second machining point P2 in the Z-axis direction on the target workpiece W, and the vertical axis indicates the stiffness values of the first machining point P1 and the second machining point P2.

In this embodiment, one selected from the first to fourth disc portions 31 to 34 is set as the first machining point P1 as the reference machining position, and one selected from the remaining first to fourth disc portions 31 to 34 is set as the second machining point P2 as the machining condition calculation target. The first machining point P1 and the second machining point P2 are set at different positions. For ease of explanation, the following will take as an example a case in which the first disc portion 31 is set as the first machining point P1 and the second disc portion 32 is set as the second machining point P2. Therefore, the stiffness value of the first machining point P1 is greater than the stiffness value of the second machining point P2.

In this embodiment, the machining conditions for the second machining point P2 are set as follows. First, an estimated stiffness value R1 (P2) for the second machining point P2 (hereinafter referred to as the "first estimated stiffness value of the second machining point") is calculated using information I (P1) about the first machining point P1. The first estimated stiffness value R1 (P2) for the second machining point is calculated based on information about the existing machining conditions at the first machining point P1 of the existing workpiece, information about the existing machining accuracy or existing machining accuracy standard at the first machining point P1, and the shape of the target workpiece W.

Then, the machining conditions for the second machining point P2 are set using the calculated first estimated stiffness value R1 (P2) of the second machining point. Note that in this embodiment, the estimated stiffness value of the first machining point P1 is not calculated.

The existing workpiece is a workpiece that has already been machined and is made of the same material and has the same shape as the target workpiece W. The target workpiece W is a workpiece that is to be machined and for which the machining conditions have not yet been determined.

1-5. Structure of machining condition setting device 5 The machining condition setting device 5 will be described with reference to Fig. 7. As shown in Fig. 7, the machining condition setting device 5 includes an existing machining condition acquisition unit 50, an existing workpiece information acquisition unit 51, a second machining point first estimated stiffness value calculation unit 52, and a second machining point machining condition calculation unit 53.

The existing machining condition acquisition unit 50 acquires information on the existing machining conditions when machining an existing workpiece that has already been machined from the database 3. The existing machining condition acquisition unit 50 only needs to acquire information on the existing machining conditions at the first machining point P1 of the existing workpiece. However, the existing machining condition acquisition unit 50 may also acquire information on the existing machining conditions from the input device 2. The existing machining conditions are not particularly limited, and examples include the machining sequence, feed rate, spindle rotation speed, and truing conditions. Note that the existing workpiece is made of the same material and has the same shape as the target workpiece W, so it is not shown in the figure.

The existing workpiece information acquisition unit 51 acquires information on the existing machining accuracy of the existing workpiece or information on the existing machining accuracy standard required for the existing workpiece from the database 3. The existing workpiece information acquisition unit 51 may acquire information on the existing machining accuracy at the first machining point P1 of the existing workpiece or information on the existing machining accuracy standard. However, the existing workpiece information acquisition unit 51 may also acquire information on the existing machining accuracy or information on the existing machining accuracy standard from the input device 2. The existing machining accuracy is not particularly limited, and examples include roundness, runout, surface roughness, etc. The existing machining accuracy standard refers to a standard in which upper and lower numerical ranges are set for the above-mentioned existing machining accuracy.

The second machining point first estimated stiffness value calculation unit 52 acquires information including at least the shape of the target workpiece W via the input device 2. The information input from the input device 2 is not particularly limited, and examples include any information such as the shape or material of the target workpiece W, the shape, material or machining conditions of the existing workpiece, etc.

The second machining point first estimated stiffness value calculation unit 52 acquires information on the existing machining conditions from the existing machining condition acquisition unit 50. The second machining point first estimated stiffness value calculation unit 52 also acquires information on the existing machining accuracy or information on the existing machining accuracy standard from the existing workpiece information acquisition unit 51.

The second processing point first estimated stiffness value calculation unit 52 calculates the second processing point first estimated stiffness value R1 (P2) that represents the relationship between a predetermined processing force F and a deformation amount δx at the second processing point P2 based on information on the existing processing conditions at the first processing point P1 of the target workpiece W, information on the existing processing accuracy or existing processing accuracy standard at the first processing point P1, and the shape of the target workpiece W. Note that the stiffness value at the second processing point P2 refers to the quotient obtained by dividing the processing force F by the deformation amount δx.

The second processing point machining condition calculation unit 53 acquires the second processing point first estimated stiffness value R1 (P2) from the second processing point first estimated stiffness value calculation unit 52, and calculates the second processing point machining conditions, which are the machining conditions for the second processing point P2 of the target workpiece W, based on the second processing point first estimated stiffness value R1 (P2).

The display device 4 acquires the second processing point machining conditions from the second processing point machining condition calculation unit 53 and displays the second processing point machining conditions.

1-6. Operation of the machining condition setting device 5 The operation of the machining condition setting device 5 will be described with reference to Fig. 8. As shown in Fig. 8, when the machining condition setting device 5 is started, the existing machining condition acquisition unit 50 acquires information on the existing machining conditions of the first machining point P1 when the existing workpiece is machined (S1).

Next, the existing workpiece information acquisition unit 51 acquires information regarding the existing machining accuracy for the first machining point P1 of the existing workpiece or information regarding the existing machining accuracy standard required for the existing workpiece (S2).

Information regarding the shape, etc. of the target workpiece W is input to the input device 2. The second machining point first estimated stiffness value calculation unit 52 acquires information regarding the shape of the target workpiece W via the input device 2 (S3).

The second processing point first estimated stiffness value calculation unit 52 acquires information on the existing machining conditions of the first processing point P1 from the existing machining condition acquisition unit 50. The second processing point first estimated stiffness value calculation unit 52 also acquires information on the existing machining accuracy or information on the existing machining accuracy standard for the first processing point P1 from the existing workpiece information acquisition unit 51. The second processing point first estimated stiffness value calculation unit 52 calculates the second processing point first estimated stiffness value R1 (P2) representing the relationship between the predetermined machining force F and the deformation amount δx at the second processing point P2 based on information on the existing machining conditions at the first processing point P1 of the target workpiece W, information on the existing machining accuracy or existing machining accuracy standard at the first processing point P1, and the shape of the target workpiece W (S4). When the second processing point first estimated stiffness value calculation unit 52 adopts the existing machining accuracy standard, it calculates the second processing point first estimated stiffness value R1 (P2) by adopting any value included between the upper limit and the lower limit of the existing machining accuracy standard. Note that when calculating the first estimated stiffness value R1 (P2) of the second processing point, the estimated stiffness value of the first processing point P1 is not calculated.

Next, the second processing point processing condition calculation unit 53 acquires the second processing point first estimated stiffness value from the second processing point first estimated stiffness value calculation unit 52, and calculates the second processing point processing conditions, which are the processing conditions for the second processing point P2 of the target workpiece W, based on the second processing point first estimated stiffness value R1 (P2) (S5).

Next, the display device 4 acquires the second processing point machining conditions from the second processing point machining condition calculation unit 53 and displays the second processing point machining conditions (S6). This completes the operation of the machining condition setting device 5.

6, the black circles represent the true stiffness values at the first machining point P1 and the second machining point P2 of the target workpiece W. Although the true stiffness values of the target workpiece W exist, in this embodiment, the true stiffness values are unknown to the operator.

As described above, the first processing point P1, which is the first circular plate portion 31, is located closer to the end of the target workpiece W than the second processing point P2, which is the second circular plate portion 32, and therefore the stiffness value of the first processing point P1 is greater than the stiffness value of the second processing point P2. Therefore, the relationship between the true stiffness value at the first processing point P1 and the true stiffness value at the second processing point P2 is as shown by the solid line in FIG. 6.

When setting the machining conditions for the target workpiece W, setting the machining conditions based on a value greater than the true stiffness value of the target workpiece W will cause a decrease in the machining accuracy of the target workpiece W. For this reason, when setting the machining conditions for the target workpiece W, it is desirable to set the machining conditions based on a value smaller than the true stiffness value of the target workpiece W.

In this embodiment, information about an existing workpiece that has already been machined is used as the basis for setting the machining conditions for the target workpiece W. It is assumed that the existing workpiece has been machined to the desired accuracy. In this case, it is certain that the machining conditions for the existing workpiece are set based on a value smaller than the true stiffness value of the existing workpiece. Therefore, when setting the machining conditions for the target workpiece W, which has the same shape and material as the existing workpiece, by using information about the existing workpiece, it is possible to minimize the use of values larger than the true stiffness value of the target workpiece W. This makes it possible to improve the machining accuracy of the target workpiece W.

As described above, the true stiffness value of the first processing point P1 is greater than the true stiffness value of the second processing point P2. For this reason, the estimated stiffness value is also estimated to be greater than the estimated stiffness value of the second processing point P2, as shown by the dashed line in FIG. 6. Therefore, in this embodiment, the second processing point first estimated stiffness value R1 (P2), which is the estimated stiffness value at the second processing point P2 of the target workpiece W, is calculated based on information about the existing workpiece at the first processing point P1 of the target workpiece W. As a result, the estimated stiffness value can be estimated as high as possible based on information about the existing workpiece at the first processing point P1, which is considered to have a greater estimated stiffness value than the second processing point P2. This makes it possible to suppress a decrease in the manufacturing efficiency of the target workpiece W due to an underestimation of the estimated stiffness value.

In addition, by calculating the second processing point first estimated stiffness value R1 (P2) at the second processing point P2, which is considered to have a smaller estimated stiffness value than the first processing point P1, it is possible to calculate the smallest possible value within the estimated stiffness range at the second processing point P2. In this embodiment, the second processing point first estimated stiffness value R1 (P2) is the lower limit value of the possible estimated stiffness range at the second processing point P2. By calculating the second processing point processing conditions based on such second processing point first estimated stiffness value R1 (P2), it is possible to both suppress defects such as deformation of the target workpiece W or the processing device 6 and improve the manufacturing efficiency of the target workpiece W.

As described above, according to this embodiment, even if the stiffness value of the second processing point P2 is unknown, it is possible to estimate the first estimated stiffness value R1 (P2) of the second processing point at the second processing point P2 and calculate the second processing point processing conditions based on this first estimated stiffness value R1 (P2) of the second processing point.

(Embodiment 2)
2-1. Overview of machining condition setting An overview of the machining condition setting of this embodiment will be described with reference to Fig. 9. In Fig. 9, the horizontal axis indicates the positions of the first machining point P1 and the second machining point P2 in the Z-axis direction on the target workpiece W, and the vertical axis indicates the stiffness values of the first machining point P1 and the second machining point P2.

In this embodiment, one selected from the first to fourth disc portions 31 to 34 is set as the first machining point P1 as the reference machining position, and one selected from the remaining first to fourth disc portions 31 to 34 is set as the second machining point P2 for which machining conditions are to be calculated. In this embodiment, as in the first embodiment, an example is given in which the first disc portion 31 is set as the first machining point P1 and the second disc portion 32 is set as the second machining point P2. Then, information about the first machining point P1 is used to calculate the machining conditions for the second machining point P2.

In this embodiment, the machining conditions for the second machining point P2 are set as follows. First, information I(P1) about the first machining point P1 is used to calculate an estimated stiffness value R(P1) of the first machining point P1 (hereinafter referred to as the "first machining point estimated stiffness value"). The first machining point estimated stiffness value R(P1) is calculated based on information about the existing machining conditions at the first machining point P1 of the existing workpiece, information about the existing machining accuracy or existing machining accuracy standard at the first machining point P1, and the shape of the target workpiece W.

Then, the first estimated stiffness value R1 (P2) of the second processing point is calculated based on the estimated stiffness value R (P1) of the first processing point. In other words, this embodiment differs from embodiment 1 in that the estimated stiffness value R (P1) of the first processing point P1 is calculated. Then, the calculated first estimated stiffness value R1 (P2) of the second processing point is used to set the processing conditions of the second processing point P2.

2-2. Configuration of the machining condition setting device 5a Next, the machining condition setting device 5a according to this embodiment will be described with reference to Fig. 10. The machining condition setting device 5a according to this embodiment includes a first machining point estimated stiffness value calculation unit 60 in addition to the machining condition setting device 5 according to the first embodiment. Note that, among the symbols used in the second and subsequent embodiments, those that are the same as those used in the previous embodiments represent the same components, etc. as those in the previous embodiments, unless otherwise specified.

As shown in FIG. 10, the first machining point estimated stiffness value calculation unit 60 acquires information regarding the shape of the target workpiece W, etc., via the input device 2.

The first processing point estimated stiffness value calculation unit 60 acquires information on the existing processing conditions at the first processing point P1 of the existing workpiece from the existing processing condition acquisition unit 50. The first processing point estimated stiffness value calculation unit 60 also acquires information on the existing processing accuracy at the first processing point P1 of the existing workpiece or information on the existing processing accuracy standard from the existing workpiece information acquisition unit 51.

The first processing point estimated stiffness value calculation unit 60 calculates a first processing point estimated stiffness value R(P1) that represents the relationship between a predetermined processing force F and a deformation amount δx at the first processing point P1 based on information on the existing processing conditions at the first processing point P1, information on the existing processing accuracy or the existing processing accuracy standard at the first processing point P1, and the shape of the target workpiece W. Note that the stiffness value at the first processing point P1 refers to the quotient obtained by dividing the processing force F by the deformation amount δx.

The second processing point first estimated stiffness value calculation unit 52 acquires the first processing point estimated stiffness value R (P1) from the first processing point estimated stiffness value calculation unit 60. The second processing point first estimated stiffness value calculation unit 52 calculates the second processing point first estimated stiffness value R1 (P2) based on the first processing point estimated stiffness value R (P1) and the shape of the target workpiece W.

Other than the above, the configuration is substantially the same as in embodiment 1, so the same components are given the same reference numerals and duplicated descriptions are omitted.

2-3. Operation of the machining condition setting device 5a The operation of the machining condition setting device 5a will be described with reference to Fig. 11. When the machining condition setting device 5a is started, the existing machining condition acquisition unit 50 acquires information on the existing machining conditions when the existing workpiece is machined (S1).

Next, the existing workpiece information acquisition unit 51 acquires information regarding the existing machining accuracy of the existing workpiece or information regarding the existing machining accuracy standards required for the existing workpiece (S2).

Information regarding the shape of the target workpiece W is input to the input device 2. The second processing point first estimated stiffness value calculation unit 52 and the first processing point estimated stiffness value calculation unit 60 acquire information regarding the shape of the target workpiece W via the input device 2 (S10).

The first processing point estimated stiffness value calculation unit 60 acquires information on the existing machining conditions of the first processing point P1 from the existing machining condition acquisition unit 50. The first processing point estimated stiffness value calculation unit 60 also acquires information on the existing machining accuracy or existing machining accuracy standard for the first processing point P1 from the existing workpiece information acquisition unit 51. The first processing point estimated stiffness value calculation unit 60 calculates a first processing point estimated stiffness value R (P1) that represents the relationship between the machining force F and the deformation amount δx at the first processing point P1 based on information on the existing machining conditions at the first processing point P1 of the target workpiece W, information on the existing machining accuracy or existing machining accuracy standard at the first processing point P1, and the shape of the target workpiece W (S11). When the first processing point estimated stiffness value calculation unit 60 adopts the existing machining accuracy standard, it calculates the first processing point estimated stiffness value R (P1) by adopting any value included between the upper limit and the lower limit of the existing machining accuracy standard.

The second processing point first estimated stiffness value calculation unit 52 acquires the first processing point estimated stiffness value R (P1) from the first processing point estimated stiffness value calculation unit 60. The second processing point first estimated stiffness value calculation unit 52 calculates the second processing point first estimated stiffness value R1 (P2) that represents the relationship between the predetermined processing force F and the deformation amount δx at the second processing point P2 based on the first processing point estimated stiffness value R (P1) and the shape of the target workpiece W (S12).

Next, the second processing point processing condition calculation unit 53 acquires the second processing point first estimated stiffness value R1 (P2) from the second processing point first estimated stiffness value calculation unit 52, and calculates the second processing point processing conditions, which are the processing conditions for the second processing point P2 of the target workpiece W, based on the second processing point first estimated stiffness value R1 (P2) (S5).

Next, the display device 4 acquires the second processing point machining conditions from the second processing point machining condition calculation unit 53 and displays the second processing point machining conditions (S6). This completes the operation of the machining condition setting device 5a.

2-4. Effects of this embodiment In this embodiment, the first processing point estimated stiffness value calculation unit 60 calculates the first processing point estimated stiffness value R(P1) based on information on the existing processing conditions at the first processing point P1, information on the existing processing accuracy or information on the existing processing accuracy standard at the first processing point P1, and the shape of the target workpiece W. Since the first processing point estimated stiffness value R(P1) is calculated based on information on the first processing point P1, the accuracy of the first processing point estimated stiffness value R(P1) can be improved.

In this embodiment, the second processing point first estimated stiffness value calculation unit 52 estimates the second processing point first estimated stiffness value R1 (P2) at the second processing point P2 of the target workpiece W based on the first processing point estimated stiffness value R (P1) and the shape of the target workpiece W. As described above, since the accuracy of the first processing point estimated stiffness value R (P1) is improved, the accuracy of the second processing point first estimated stiffness value R1 (P2) can also be improved.

9, in this embodiment, the first processing point estimated stiffness value R (P1) can be calculated with high accuracy based on information about the first processing point P1. The second processing point first estimated stiffness value R1 (P2) can be calculated based on the first processing point estimated stiffness value R (P1) calculated with high accuracy in this way, so the accuracy of the second processing point first estimated stiffness value R1 (P2) is also improved.

(Embodiment 3)
3-1. Overview of machining condition setting An overview of the machining condition setting of this embodiment will be described with reference to Fig. 12 and Fig. 13. In Fig. 12 and Fig. 13, the horizontal axis indicates the positions of the first machining point P1 and the second machining point P2 in the Z-axis direction on the target workpiece W, and the vertical axis indicates the stiffness values of the first machining point P1 and the second machining point P2.

In this embodiment, one selected from the first to fourth disc portions 31 to 34 is set as the first machining point P1 as the reference machining position, and one selected from the remaining first to fourth disc portions 31 to 34 is set as the second machining point P2 for which machining conditions are to be calculated. In this embodiment, as in the first embodiment, an example is given in which the first disc portion 31 is set as the first machining point P1 and the second disc portion 32 is set as the second machining point P2. Then, taking into account information related to the first machining point P1, the machining conditions for the second machining point P2 are calculated.

In this embodiment, the processing conditions for the second processing point P2 are set as follows. First, as shown in Figures 12 and 13, the first processing point estimated stiffness value R (P1) is calculated using information I (P1) related to the first processing point P1. Next, the second processing point first estimated stiffness value R1 (P2) is calculated based on the first processing point estimated stiffness value R (P1).

In parallel, as shown in Figures 12 and 13, a second estimated stiffness value R2(P2) of the second machining point P2 (hereinafter referred to as the "second estimated stiffness value of the second machining point") is calculated using information I(P2) about the second machining point P2. The second estimated stiffness value R2(P2) of the second machining point is calculated based on information about the existing machining conditions at the second machining point P2 of the existing workpiece, information about the existing machining accuracy or existing machining accuracy standard at the second machining point P2, and the shape of the target workpiece W.

The first estimated stiffness value R1 (P2) of the second processing point and the second estimated stiffness value R2 (P2) of the second processing point are usually different values because they are based on different reference information. Therefore, to set the processing conditions for the second processing point P2, one selected from the first estimated stiffness value R1 (P2) of the second processing point and the second estimated stiffness value R2 (P2) of the second processing point is used. In particular, the larger of the first estimated stiffness value R1 (P2) of the second processing point and the second estimated stiffness value R2 (P2) of the second processing point is selected.

Therefore, as shown in Figure 12, when the first estimated stiffness value R1 (P2) of the second processing point is greater than the second estimated stiffness value R2 (P2) of the second processing point, the first estimated stiffness value R1 (P2) of the second processing point is used to set the processing conditions of the second processing point P2. On the other hand, as shown in Figure 13, when the second estimated stiffness value R2 (P2) of the second processing point is greater than the first estimated stiffness value R1 (P2) of the second processing point, the second estimated stiffness value R2 (P2) of the second processing point is used to set the processing conditions of the second processing point P2.

3-2. Configuration of machining condition setting device 5b Next, the machining condition setting device 5b according to the third embodiment will be described with reference to Fig. 14. The machining condition setting device 5b according to this embodiment includes a second machining point second estimated stiffness value calculation unit 70, a storage device 71, an arithmetic processing device 72, and a knowledge model storage device 73. The configuration other than the above is substantially the same as that of the second embodiment, so the same members are denoted by the same reference numerals and duplicated explanations will be omitted.

The second machining point second estimated stiffness value calculation unit 70 acquires information regarding the shape of the target workpiece W, etc., via the input device 2.

The second machining point second estimated stiffness value calculation unit 70 acquires information on the existing machining conditions from the existing machining condition acquisition unit 50. The second machining point second estimated stiffness value calculation unit 70 also acquires information on the existing machining accuracy or information on the existing machining accuracy standard from the existing workpiece information acquisition unit 51.

The second processing point second estimated stiffness value calculation unit 70 calculates the second processing point second estimated stiffness value R2 (P2) that represents the relationship between a predetermined processing force F and a deformation amount δx at the second processing point P2 based on information on the existing processing conditions at the second processing point P2 of the target workpiece W, information on the existing processing accuracy or existing processing accuracy standard at the second processing point P2, and the shape of the target workpiece W. The stiffness value at the second processing point P2 refers to the quotient obtained by dividing the processing force F by the deformation amount δx.

The second processing point processing condition calculation unit 53 acquires the second processing point first estimated stiffness value R1 (P2) from the second processing point first estimated stiffness value calculation unit 52. The second processing point processing condition calculation unit 53 also acquires the second processing point second estimated stiffness value R2 (P2) from the second processing point second estimated stiffness value calculation unit 70. In this embodiment, the second processing point first estimated stiffness value R1 (P2) is the lower limit value of the estimated stiffness range at the second processing point P2, and the second processing point second estimated stiffness value R2 (P2) is the lower limit value of the estimated stiffness range at the second processing point P2.

The second processing point processing condition calculation unit 53 calculates the second processing point processing conditions, which are the processing conditions for the second processing point P2 of the target workpiece W, using the first estimated stiffness value R1 (P2) of the second processing point when the first estimated stiffness value R1 (P2) of the second processing point is greater than the second estimated stiffness value R2 (P2) of the second processing point, and calculates the second processing point processing conditions, which are the processing conditions for the second processing point P2 of the target workpiece W, using the second estimated stiffness value R2 (P2) of the second processing point when the second estimated stiffness value R2 (P2) of the second processing point is greater than the first estimated stiffness value R1 (P2).

The storage device 71 is configured to store information about the machining conditions of the target workpiece W, information about the machining specifications required for the target workpiece W, and target workpiece information including the stiffness value of the target workpiece W. The storage device 71 may be configured in any manner, such as a known hard disk drive device.

The calculation processing device 72 includes a target machining condition calculation unit 74. The target machining condition calculation unit 74 calculates the target machining conditions of the target workpiece W based on the target workpiece information including information on the machining conditions of the target workpiece W, information on the machining specifications required for the target workpiece W, and the rigidity value of the target workpiece W.

When target workpiece information is stored in the storage device 71, the arithmetic processing device 72 acquires the target workpiece information and causes the target machining condition calculation unit 74 to calculate the target machining conditions based on the target workpiece information.

When the target workpiece information is not stored in the storage device 71, the calculation processing device 72 causes the existing machining condition acquisition unit 50 to acquire information related to the existing machining conditions, causes the existing workpiece information acquisition unit 51 to acquire information related to the existing machining accuracy or existing machining accuracy standards, causes the second machining point first estimated stiffness value calculation unit 52 to calculate the second machining point first estimated stiffness value R1 (P2), and causes the second machining point machining condition calculation unit 53 to calculate the second machining point machining conditions.

The display device 4 displays the second processing point machining conditions when the second processing point machining conditions are acquired from the second processing point machining condition calculation unit 53. In addition, the display device 4 displays the target machining conditions when the target machining conditions are acquired from the target machining condition calculation unit 74.

The knowledge model storage device 73 stores the first knowledge model M1 and the second knowledge model M2. The knowledge model storage device 73 can be any configuration, such as a publicly known hard disk drive device.

The first knowledge model M1 has as input factors the existing machining conditions and information on the existing machining accuracy or existing machining accuracy standards for each of the first to fourth disc sections 31 to 34, and has as output factors the second machining point first estimated stiffness value R1 (P2) or the first machining point estimated stiffness value R (P1), which represents the relationship between a specified machining force and the amount of deformation.

The second knowledge model M2 uses the second processing point first estimated stiffness value R1 (P2) as an input factor and outputs the second processing point processing conditions as an output factor.

The second processing point second estimated stiffness value calculation unit 70 calculates the second processing point second estimated stiffness value R2 (P2) using the first knowledge model M1. The first processing point estimated stiffness value calculation unit 60 calculates the first processing point estimated stiffness value R (P1) using the first knowledge model M1.

The second processing point processing condition calculation unit 53 calculates the second processing point processing conditions using the second knowledge model M2.

3-3. Configuration of the first knowledge model M1 and the second knowledge model M2 Next, the first knowledge model M1 and the second knowledge model M2 will be described with reference to FIG. 15. First, the second knowledge model M2 will be described. The second knowledge model M2 is conceptually expressed in a network form. An example of a knowledge network diagram N in which the second knowledge model M2 is expressed in a network form will be described with reference to FIG. 15. In other words, the knowledge network diagram N is a graphical representation of the second knowledge model M2. In this embodiment, a knowledge network diagram N related to the second knowledge model M2 in the machining field will be taken as an example.

As shown in FIG. 15, the knowledge network diagram N comprises a plurality of node figures 21 and link figures 22 that connect the node figures 21 to each other. In this embodiment, the node figures 21 are represented by letters surrounded by rectangles. In this embodiment, the link figures 22 are represented by straight lines. However, the link figures 22 may be written as arrow lines to indicate the directionality of the definitions between the factors. The node figures 21 represent factors defined by industrial technology terms in the second knowledge model M2.

Multiple factors may have a technical inclusion relationship (also called a hierarchical relationship or a master-slave relationship) or a technical heterogeneous dependency relationship. In other words, the relationships between factors can be classified into the above two types.

For example, the mechanical specifications have a relationship that includes rigidity, mechanical precision, tracking ability, and operating speed. In other words, as factors that have a technical inclusive relationship, the mechanical specifications are considered to be higher-level conceptual factors, and rigidity, mechanical precision, tracking ability, and operating speed are considered to be lower-level conceptual factors. However, the mechanical specifications may be configured to include factors other than those mentioned above.

An example of a factor that has a technical heterogeneous dependency is stiffness and cycle time. In what follows, the relationship between two factors that have a technical inclusion relationship is simply referred to as an inclusion relationship, and the relationship between two factors that have a technical heterogeneous dependency is simply referred to as a heterogeneous dependency.

The link graphic 22 represents the relationship between the node graphic 21. The link graphic 22 represents the relationship between the factors in the second knowledge model M2.

On the other hand, the first knowledge model M1 has the input factors and output factors shown in FIG. 15 reversed. Therefore, the directionality of the definitions between factors in the first knowledge model M1 is configured to be the opposite direction to that of the second knowledge model M2.

3-4. Operation of the machining condition setting device 5b according to this embodiment (1) Description of main routine Next, the machining condition setting device 5b according to this embodiment will be described with reference to Fig. 16. As shown in Fig. 16, when the machining condition setting device 5b is started, the arithmetic processing device 72 judges whether or not the target workpiece information is stored in the storage device 71 (S20). When the target workpiece information is stored in the storage device 71, the arithmetic processing device 72 acquires the target workpiece information from the storage device 71 (S21).

Next, the calculation processing device 72 causes the target workpiece information to be acquired by the target machining condition calculation unit 74. The target machining condition calculation unit 74 calculates the target machining conditions based on the target workpiece information (S22).

The calculation processing device 72 causes the display device 4 to display the calculated target machining conditions. The display device 4 then displays the target machining conditions (S23). This completes the operation of the machining condition setting device 5b.

On the other hand, when the target workpiece information is not stored in the storage device 71, a stiffness value estimation process is executed (S24). By executing the stiffness value estimation process, an estimated stiffness value at the second processing point P2 is calculated.

Based on the calculated estimated stiffness value, a processing condition calculation process is executed (S25). By executing the processing condition calculation process, second processing point processing conditions, which are the processing conditions at the second processing point P2, are calculated.

The display device 4 displays the calculated second processing point processing conditions (S23). This completes the operation of the processing condition setting device 5b.

(2) Operation of Stiffness Value Estimation Process Next, the operation of the stiffness value estimation process will be described with reference to Fig. 17. When the stiffness value estimation process is executed (S24), the calculation processing device 72 causes the existing machining condition acquisition unit 50 to acquire information on the existing machining conditions from the database 3. As a result, the existing machining condition acquisition unit 50 acquires information on the existing machining conditions (S1).

Next, the calculation processing device 72 causes the existing workpiece information acquisition unit 51 to acquire information on the existing machining accuracy or information on the existing machining condition standards from the database 3. As a result, the existing workpiece information acquisition unit 51 acquires information on the existing machining accuracy or information on the existing machining condition standards (S2).

Information regarding the shape of the target workpiece W is input to the input device 2. As a result, the second processing point first estimated stiffness value calculation unit 52, the second processing point second estimated stiffness value calculation unit 70, and the first processing point estimated stiffness value calculation unit 60 acquire information regarding the shape of the target workpiece W via the input device 2 (S10).

The second processing point second estimated stiffness value calculation unit 70 and the first processing point estimated stiffness value calculation unit 60 acquire the first knowledge model M1 from the knowledge model storage device 73 (S30).

The calculation processing device 72 causes the first processing point estimated stiffness value calculation unit 60 to calculate the first processing point estimated stiffness value R (P1) using the first knowledge model M1 (S31). The first knowledge model M1 is configured with the existing processing conditions, information on the existing processing accuracy or information on the existing processing accuracy standard, and the shape of the target workpiece W as input factors, and the first processing point estimated stiffness value R (P1) as an output factor. The first processing point estimated stiffness value calculation unit 60 inputs the existing processing conditions at the first processing point P1, information on the existing processing accuracy or information on the existing processing accuracy standard, and the shape of the target workpiece W as input factors to the first knowledge model M1, and obtains the first processing point estimated stiffness value R (P1) output as an output factor from the first knowledge model M1.

The calculation processing device 72 causes the second processing point first estimated stiffness value calculation unit 52 to calculate the second processing point first estimated stiffness value R1 (P2) (S32). In detail, the second processing point first estimated stiffness value calculation unit 52 acquires the first processing point estimated stiffness value R (P1) from the first processing point estimated stiffness value calculation unit 60. In addition, the second processing point first estimated stiffness value calculation unit 52 acquires the shape of the target workpiece W via the input device 2. The second processing point first estimated stiffness value calculation unit 52 calculates the second processing point first estimated stiffness value R1 (P2) based on the first processing point estimated stiffness value R (P1) and the shape of the target workpiece W.

The calculation processing device 72 causes the second processing point second estimated stiffness value calculation unit 70 to calculate the second processing point second estimated stiffness value R2 (P2) using the first knowledge model M1 (S33). The second processing point second estimated stiffness value calculation unit 70 inputs the existing processing conditions at the second processing point P2, information on the existing processing accuracy or information on the existing processing accuracy standard, and the shape of the target workpiece W as input factors to the first knowledge model M1, and obtains the second processing point second estimated stiffness value R2 (P2) output from the first knowledge model M1 as an output factor. This ends the stiffness value estimation process.

(3) Operation of the machining condition calculation process Next, the operation of the machining condition calculation process will be described with reference to Fig. 12, Fig. 13, and Fig. 18. When the machining condition calculation process (S25) is executed, the arithmetic processing device 72 causes the second machining point machining condition calculation unit 53 to calculate the second machining point machining conditions. Details will be described below.

The calculation processing device 72 causes the second processing point processing condition calculation unit 53 to acquire the second processing point first estimated stiffness value R1 (P2) calculated by the second processing point first estimated stiffness value calculation unit 52, and acquire the second processing point second estimated stiffness value R2 (P2) calculated by the second processing point second estimated stiffness value calculation unit 70 (S40).

The calculation processing device 72 causes the second processing point processing condition calculation unit 53 to acquire the second knowledge model M2 (S41).

The second processing point processing condition calculation unit 53 determines whether the second processing point first estimated stiffness value R1 (P2) is greater than the second processing point second estimated stiffness value R2 (P2) (S42).

When the second processing point processing condition calculation unit 53 determines that the second processing point first estimated stiffness value R1 (P2) is greater than the second processing point second estimated stiffness value R2 (P2) (S42: Y), it selects the second processing point first estimated stiffness value R1 (P2) (S43).

The second processing point processing condition calculation unit 53 calculates the second processing point processing conditions using the second knowledge model M2 (S44). The second knowledge model M2 uses the second processing point first estimated stiffness value R1 (P2) or the second processing point second estimated stiffness value R2 (P2) as an input factor, and the second processing point processing conditions as an output factor. The second processing point processing condition calculation unit 53 inputs the second processing point first estimated stiffness value R1 (P2) as an input factor to the second knowledge model M2, and obtains the second processing point processing conditions as an output factor. This completes the processing condition calculation process.

Figure 12 shows the relationship between the estimated stiffness values when the first estimated stiffness value R1 (P2) of the second processing point is greater than the second estimated stiffness value R2 (P2) of the second processing point. When the first estimated stiffness value R1 (P2) of the second processing point is greater than the second estimated stiffness value R2 (P2) of the second processing point, the second processing point processing conditions are calculated based on the first estimated stiffness value R1 (P2) of the second processing point, which is the lower limit of the estimated stiffness values that can be taken at the second processing point P2. This makes it possible to set the processing conditions of the target workpiece W based on the largest possible estimated stiffness value while suppressing the occurrence of defects in the target workpiece W or the processing device 6. This makes it possible to improve the manufacturing efficiency of the target workpiece W while ensuring the safety of the target workpiece W or the processing device 6.

On the other hand, when the second processing point processing condition calculation unit 53 determines that the first estimated stiffness value R1 (P2) of the second processing point is not greater than the second estimated stiffness value R2 (P2) of the second processing point (S42: N), it selects the second estimated stiffness value R2 (P2) of the second processing point (S45).

The second processing point processing condition calculation unit 53 calculates the second processing point processing conditions using the second knowledge model M2 (S44). The second knowledge model M2 uses the second processing point first estimated stiffness value R1 (P2) or the second processing point second estimated stiffness value R2 (P2) as an input factor, and the second processing point processing conditions as an output factor. The second processing point processing condition calculation unit 53 inputs the second processing point second estimated stiffness value R2 (P2) as an input factor to the second knowledge model M2, and obtains the second processing point processing conditions as an output factor. This completes the processing condition calculation process.

Figure 13 shows the relationship between the estimated stiffness values when the first estimated stiffness value R1 (P2) of the second processing point is not greater than the second estimated stiffness value R2 (P2) of the second processing point. When the first estimated stiffness value R1 (P2) of the second processing point is not greater than the second estimated stiffness value R2 (P2) of the second processing point, the second processing point processing conditions are calculated based on the second estimated stiffness value R2 (P2), which is the lower limit of the estimated stiffness values that can be taken at the second processing point P2. This makes it possible to set the processing conditions of the target workpiece W based on the largest possible estimated stiffness value while suppressing the occurrence of defects in the target workpiece W or the processing device 6. This makes it possible to improve the manufacturing efficiency of the target workpiece W while ensuring the safety of the target workpiece W or the processing device 6.

3-5. Effects of this embodiment Since the second processing point first estimated stiffness value R1 (P2) or the second processing point second estimated stiffness value R2 (P2) is the lower limit value of the estimated stiffness range that can be taken at the second processing point P2, it is possible to prevent the stiffness value of the target workpiece W from being overestimated. As a result, by using either the second processing point first estimated stiffness value R1 (P2) or the second processing point second estimated stiffness value R2 (P2) when calculating the second processing point machining conditions, it is possible to prevent malfunctions in the target workpiece W or the machining device 6 due to inappropriate machining conditions based on an excessively large estimated stiffness value.

In addition, according to this embodiment, when target workpiece information is stored in the storage device 71, the arithmetic processing device 72 can cause the target machining condition calculation unit 74 to calculate the target machining conditions using the target workpiece information. This allows the target machining conditions to be calculated efficiently.

In addition, according to this embodiment, the first processing point estimated stiffness value R (P1) and the second processing point first estimated stiffness value R1 (P2) can be calculated using the first knowledge model M1, so the estimation accuracy of the first processing point estimated stiffness value R (P1) and the second processing point first estimated stiffness value R1 (P2) can be improved.In addition, according to this embodiment, the second processing point processing conditions can be calculated using the second knowledge model M2, so the estimation accuracy of the second processing point processing conditions can be improved.

(Embodiment 4)
4-1. Configuration of machining condition setting device 5c Next, the machining condition setting device 5c according to the fourth embodiment will be described with reference to Figs. 19-20. The machining condition setting device 5c according to the fourth embodiment includes a workpiece support stiffness value calculation unit 80, a new target workpiece information acquisition unit 81, a new machining point estimated stiffness value calculation unit 82, and a new target machining condition calculation unit 83 in addition to the machining condition setting device 5b according to the third embodiment. The knowledge model storage device 73 according to the fourth embodiment stores a third knowledge model M3 and a fourth knowledge model M4 in addition to the first knowledge model M1 and the second knowledge model M2. The configuration other than the above is substantially the same as that of the third embodiment, so the same members are denoted by the same reference numerals and the duplicated description will be omitted.

The storage device 71 stores the first estimated stiffness value R1 (P2) of the second processing point of the target workpiece W and information on the machined target workpiece machined based on the second processing point processing conditions. The machined target workpiece has the same shape as the target workpiece W, so it is not shown. The workpiece support stiffness value calculation unit 80 acquires the shape of the machined target workpiece machined based on the second processing point processing conditions stored in the storage device 71. The workpiece support stiffness value calculation unit 80 calculates the workpiece support stiffness value of the processing device 6 that machined the machined target workpiece based on the first estimated stiffness value R1 (P2) of the second processing point of the target workpiece W and the shape of the machined target workpiece machined based on the second processing point processing conditions.

The new target workpiece information acquisition unit 81 acquires new target workpiece information related to the shape and material of the new target workpiece Wa, which is different from the machined target workpiece, via the input device 2. FIG. 20 shows an example of the new target workpiece Wa. The shape of the new target workpiece Wa is not particularly limited. In this embodiment, an example is shown in which the diameter of the shaft portion 130 is smaller than the shaft portion 30 of the target workpiece W.

The new machining point estimated stiffness value calculation unit 82 acquires new target workpiece information from the new target workpiece information acquisition unit 81. The new machining point estimated stiffness value calculation unit 82 also acquires the workpiece support stiffness value from the workpiece support stiffness value calculation unit 80. The new machining point estimated stiffness value calculation unit 82 calculates a new machining point estimated stiffness value that represents the relationship between a predetermined machining force F and a deformation amount δx at the machining point of the new target workpiece Wa based on the workpiece support stiffness value and the new target workpiece information. The new machining point estimated stiffness value is the lower limit value of the possible estimated stiffness range for the new target workpiece Wa.

The new target machining condition calculation unit 83 acquires the new machining point estimated stiffness value from the new machining point estimated stiffness value calculation unit 82. The new target machining condition calculation unit 83 calculates the new target machining conditions, which are the machining conditions for the new target workpiece Wa, based on the new machining point estimated stiffness value.

The display device 4 acquires the new target processing conditions from the new target processing condition calculation unit 83 and displays them.

The third knowledge model M3 uses the workpiece support stiffness value and new target workpiece information as input factors, and the new machining point estimated stiffness value as output factor.

The fourth knowledge model M4 uses the new machining point estimated stiffness value as an input factor and the new target machining conditions as an output factor.

The new processing point estimated stiffness value calculation unit 82 calculates the new processing point estimated stiffness value using the third knowledge model M3.

The new target processing condition calculation unit 83 calculates the new target processing conditions using the fourth knowledge model M4.

4-2. Operation of the machining condition setting device 5c of this embodiment The operation of the machining condition setting device 5c of this embodiment will be described with reference to FIG. 21. The machining condition setting device 5c according to this embodiment executes a new target machining condition calculation process S50. When the new target machining condition calculation process S50 is executed, the new target workpiece information acquisition unit 81 acquires new target workpiece information related to the shape and material of the new target workpiece Wa via the input device 2 (S51).

The workpiece support stiffness value calculation unit 80 obtains the first estimated stiffness value R1 (P2) of the second processing point of the target workpiece W from the storage device 71 (S52), and obtains information on the shape of the machined target workpiece machined based on the second processing point processing conditions (S53). The workpiece support stiffness value calculation unit 80 calculates the workpiece support stiffness value of the processing device 6 based on the first estimated stiffness value R1 (P2) of the second processing point of the target workpiece W and the shape of the machined target workpiece (S54).

The new machining point estimated stiffness value calculation unit 82 acquires new target workpiece information from the new target workpiece information acquisition unit 81. The new machining point estimated stiffness value calculation unit 82 also acquires the workpiece support stiffness value from the workpiece support stiffness value calculation unit 80. The new machining point estimated stiffness value calculation unit 82 also acquires the third knowledge model M3 from the knowledge model storage device 73 (S55).

The new machining point estimated stiffness value calculation unit 82 inputs the workpiece support stiffness value and new target workpiece information as input factors to the third knowledge model M3, and obtains the new machining point estimated stiffness value as an output factor, thereby calculating the new machining point estimated stiffness value (S56).

The new target machining condition calculation unit 83 acquires the new machining point estimated stiffness value from the new machining point estimated stiffness value calculation unit 82. The new target machining condition calculation unit 83 acquires the fourth knowledge model M4 from the knowledge model storage device 73 (S57). The new target machining condition calculation unit 83 inputs the new machining point estimated stiffness value as an input factor into the fourth knowledge model M4, and acquires the new target machining conditions from the fourth knowledge model M4 as output factors, thereby calculating the new target machining conditions (S58). This completes the new target machining condition calculation process.

According to the present embodiment, in a case where the rigidity of the machining point of the target workpiece W is unknown, when machining a new target workpiece Wa different from the target workpiece W, it is possible to calculate new target machining conditions, which are machining conditions for the new target workpiece Wa.

According to this embodiment, by setting the new machining point estimated stiffness value to the lower limit of the possible estimated stiffness range for the new target workpiece Wa, it is possible to prevent the stiffness value of the machining point of the new target workpiece Wa from being overestimated. This makes it possible to improve the machining efficiency of the new target workpiece Wa.

According to this embodiment, the new target processing conditions can be calculated using the third knowledge model M3 and the fourth knowledge model M4, thereby improving the estimation accuracy of the new target processing conditions.

(Embodiment 5)
Next, a machine tool 7 according to a fifth embodiment will be described with reference to Fig. 22. The machine tool 7 according to this embodiment includes a machining condition setting device 5 and a machining device 6. The machining condition setting device 5 and the machining device 6 are connected to each other and can transmit and receive information between them. Other than the above, the configuration is substantially the same as in the first embodiment, so the same members are denoted by the same reference numerals and duplicated explanations will be omitted.

According to this embodiment, it is possible to obtain a machine tool 7 that can set the machining conditions for the target workpiece W even if the rigidity of the machining point of the target workpiece W is unknown.

The present invention is not limited to the above-described embodiments, and can be applied to various embodiments without departing from the spirit of the present invention.

5, 5a, 5b, 5c Machining condition setting device, 6 Machining device, 7 Machine tool, 50 Existing machining condition acquisition unit, 51 Existing workpiece information acquisition unit, 52 Second machining point first estimated stiffness value calculation unit, 53 Second machining point machining condition calculation unit, 60 First machining point estimated stiffness value calculation unit, 70 Second machining point second estimated stiffness value calculation unit, 71 Storage device, 72 Arithmetic processing device, 73 Knowledge model storage device, 74 Target machining condition calculation unit, 80 Workpiece support stiffness value calculation unit, 81 New target workpiece information acquisition unit, 82 New machining point estimated stiffness value calculation unit, 83 New target machining condition calculation unit, F Machining force, M1 First knowledge model, M2 Second knowledge model, M3 Third knowledge model, M4 Fourth knowledge model, W Target workpiece, Wa New target workpiece, δx Deformation amount, P1 First machining point, P2 Second machining point, R (P1) First processing point estimated stiffness value, R1 (P2) Second processing point first estimated stiffness value, R2 (P2) Second processing point second estimated stiffness value

Claims (10)

an existing machining condition acquisition unit that acquires information regarding existing machining conditions when an existing workpiece that has already been machined is machined;
an existing work information acquisition unit that acquires information regarding the existing machining accuracy of the existing work or an existing machining accuracy standard required for the existing work;
a second processing point first estimated stiffness value calculation unit that calculates a second processing point first estimated stiffness value that represents a relationship between a predetermined processing force and a deformation amount at a second processing point different from the first processing point among the multiple processing points based on information regarding the existing processing conditions at a first processing point among multiple processing points of a target workpiece to be processed, information regarding the existing processing accuracy or the existing processing accuracy standard at the first processing point, and a shape of the target workpiece;
a second processing point machining condition calculation unit that calculates second processing point machining conditions, which are machining conditions for the second processing point of the target workpiece, based on the second processing point first estimated stiffness value;
A processing condition setting device comprising: The second processing point first estimated stiffness value is a lower limit value of a possible estimated stiffness range at the second processing point,
and a second machining point second estimated stiffness value calculation unit that calculates a second machining point second estimated stiffness value, which is a lower limit value of an estimated stiffness range that can represent the relationship between the predetermined machining force and the deformation amount at the second machining point, based on information on the existing machining conditions at the second machining point, information on the existing machining accuracy or the existing machining accuracy standard at the second machining point, and a shape of the target workpiece.
The second processing point processing condition calculation unit is
When the second processing point first estimated stiffness value is greater than the second processing point second estimated stiffness value, the second processing point processing condition, which is a processing condition for the second processing point of the target workpiece, is calculated using the second processing point first estimated stiffness value;
A machining condition setting device as described in claim 1, wherein when the second estimated stiffness value of the second machining point is greater than the first estimated stiffness value of the second machining point, the second estimated stiffness value of the second machining point is used to calculate second machining point machining conditions, which are machining conditions for the second machining point of the target workpiece. and a first machining point estimated stiffness value calculation unit that calculates a first machining point estimated stiffness value that represents a relationship between the predetermined machining force and a deformation amount at the first machining point based on information on the existing machining conditions at the first machining point, information on the existing machining accuracy or the existing machining accuracy standard at the first machining point, and a shape of the target workpiece,
The machining condition setting device according to claim 2 , wherein the second machining point first estimated stiffness value calculation unit calculates the second machining point first estimated stiffness value based on the first machining point estimated stiffness value and a shape of the target workpiece. The apparatus further includes a storage device and a processor,
the storage device is configured to be capable of storing target workpiece information including information on machining conditions of the target workpiece, information on machining specifications required for the target workpiece, and a stiffness value of the target workpiece;
The arithmetic processing device includes:
a target machining condition calculation unit that calculates target machining conditions for the target workpiece based on target workpiece information including information on machining conditions for the target workpiece, information on machining specifications required for the target workpiece, and a rigidity value of the target workpiece;
When the target workpiece information is stored in the storage device, the target workpiece information is acquired, and the target machining condition calculation unit is caused to calculate the target machining conditions based on the target workpiece information;
When the target workpiece information is not stored in the storage device,
causing the existing machining condition acquisition unit to acquire information regarding the existing machining conditions;
causing the existing workpiece information acquisition unit to acquire information regarding the existing machining accuracy or the existing machining accuracy standard;
causing the second processing point first estimated stiffness value calculation unit to calculate the second processing point first estimated stiffness value;
causing the second processing point processing condition calculation unit to calculate the second processing point processing condition;
The processing condition setting device according to claim 1. The machining condition setting device according to claim 1, wherein the second machining point first estimated stiffness value calculation unit calculates the second machining point first estimated stiffness value by adopting any value included between the upper limit and the lower limit of the existing machining accuracy standard. Further, a knowledge model storage device is provided for storing the first knowledge model and the second knowledge model,
The first knowledge model has, as input factors, the existing machining conditions and information on the existing machining accuracy or the existing machining accuracy standard, and has, as output factors, a second machining point first estimated stiffness value or a first machining point estimated stiffness value representing a relationship between the predetermined machining force and a deformation amount, at each of the plurality of machining points;
The second knowledge model has the second machining point first estimated stiffness value as an input factor and the second machining point machining condition as an output factor,
The second processing point second estimated stiffness value calculation unit and the first processing point estimated stiffness value calculation unit use the first knowledge model,
The machining condition setting device according to claim 3 , wherein the second machining point machining condition calculation unit uses the second knowledge model. moreover,
a workpiece support stiffness value calculation unit that calculates a workpiece support stiffness value of a processing device that processes the target workpiece based on the first estimated stiffness value of the second processing point of the target workpiece and a shape of the processed target workpiece that has been processed based on the second processing point processing conditions;
a new target work information acquisition unit that acquires new target work information relating to a shape and a material of a new target work that is different from the target work;
a new processing point estimated stiffness value calculation unit that calculates a new processing point estimated stiffness value that represents a relationship between a predetermined processing force and a deformation amount at a processing point of the new target workpiece based on the workpiece support stiffness value and the new target workpiece information;
a new target machining condition calculation unit that calculates new target machining conditions, which are machining conditions for the new target workpiece, based on the new machining point estimated stiffness value;
The processing condition setting device according to claim 1 , further comprising: The machining condition setting device according to claim 7, wherein the new machining point estimated stiffness value is a lower limit value of a possible estimated stiffness range for the new target workpiece. Further, a knowledge model storage device for storing a third knowledge model and a fourth knowledge model is provided,
the third knowledge model uses the workpiece support stiffness value and the new target workpiece information as input factors and uses the new machining point estimated stiffness value as an output factor;
The fourth knowledge model has the new machining point estimated stiffness value as an input factor and the new target machining condition as an output factor,
The new processing point estimated stiffness value calculation unit uses the third knowledge model,
The machining condition setting device according to claim 7 , wherein the new target machining condition calculation unit uses the fourth knowledge model. A machine tool equipped with a machining condition setting device according to any one of claims 1 to 9.

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