Grinding system

Abstract

To provide a grinding system capable of highly accurately setting adjustment of grinding conditions for preventing grinding-burn from remaining.SOLUTION: A grinding system 1 grinds a work-piece W into a final target shape by grinding a surface of the work-piece in plural times. The grinding system 1 comprises a grinding condition adjusting part 323 that adjusts grinding conditions for the work-piece W, on the basis of a state of grinding-burn occurring in a grinding target part of the work-piece W when grinding the work-piece W and a grinding state evaluated based on an amount of flexure occurring in the work-piece W when grinding the work-piece.SELECTED DRAWING: Figure 2

Description

Technical Field

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[0001] The present invention relates to a grinding system.

Background Art

[0002] Conventionally, when grinding a workpiece, the temperature of the machining part on the workpiece tends to become high. Therefore, depending on the grinding conditions, grinding burns may occur on the surface of the workpiece. Grinding burns are not preferable because they may cause a decrease in the mechanical strength of the workpiece. As a method for detecting such grinding burns, for example, in Patent Document 1, it is utilized that the change in the magnetic field due to the eddy current generated in the workpiece by the exciting current differs depending on the presence or absence of grinding burns. Eddy currents are generated in the workpiece by a plurality of exciting currents with different frequencies, and the difference in the change in the magnetic field due to the eddy currents between the deep part and the surface layer part of the workpiece is detected, thereby detecting the grinding burns on the surface layer part of the workpiece. A configuration is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration disclosed in Patent Document 1, no consideration is given to the grinding state when grinding burns occur. Therefore, even if the presence or absence of grinding burns is known, there is room for improvement in accurately setting the grinding conditions to prevent grinding burns from remaining on the final workpiece.

[0005] The present invention aims to provide a grinding system capable of accurately adjusting grinding conditions to prevent the remaining of grinding burns on a workpiece.

Means for Solving the Problems

[0006] (1) Aspects of the present invention First are grinding systems that grind the surface of a workpiece multiple times to process it into a final target shape, and have a grinding condition adjustment unit that adjusts the grinding conditions of the workpiece based on the grinding burn state that occurs in the processed part of the workpiece when the workpiece is ground and the grinding state evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. death, A grinding burn information acquisition unit acquires the amount of grinding burn information in the workpiece portion of the above workpiece, A grinding burn information storage unit stores the amount of grinding burn information in the workpiece portion of the workpiece acquired by the grinding burn information acquisition unit, A grinding burn state change amount calculation unit calculates the grinding burn state change amount based on the amount of grinding burn information at the workpiece acquired at the target grinding time and the previous grinding burn information amount at the same workpiece stored in the grinding burn information amount storage unit, A grinding burn state evaluation unit evaluates the grinding burn state in the workpiece based on the grinding burn state change amount obtained by the grinding burn state change amount calculation unit, A deflection amount acquisition unit that acquires the amount of deflection of the above workpiece, A grinding state evaluation unit calculates grinding characteristics based on the amount of deflection obtained at the target grinding time and evaluates the grinding state, Equipped with, The grinding condition adjustment unit adjusts the grinding conditions based on the evaluation results of the grinding burn state evaluation unit and the evaluation results of the grinding condition evaluation unit. are in the grinding system. (2) A second aspect of the present invention is a grinding system for processing the surface of a workpiece to a final target shape by grinding it multiple times, The grinding condition adjustment unit adjusts the grinding conditions of the workpiece based on the grinding burn condition that occurs on the workpiece when the workpiece is ground and the grinding condition evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. A model storage unit stores a trained model in which the above grinding state is used as the explanatory variable and the above grinding burn state is used as the objective variable. A grinding burn depth estimation unit estimates the grinding burn depth in the workpiece based on the grinding burn state obtained using the trained model at the target processing time, A deflection amount acquisition unit that acquires the amount of deflection of the above workpiece, A grinding state evaluation unit calculates grinding characteristics based on the amount of deflection obtained at the target grinding time and evaluates the grinding state, Equipped with, The grinding condition adjustment unit is located in a grinding system and adjusts the grinding conditions based on the estimation result of the grinding burn depth estimation unit and the evaluation result of the grinding condition evaluation unit. (3) A third aspect of the present invention is a grinding system for processing the surface of a workpiece to a final target shape by grinding it multiple times, The grinding condition adjustment unit adjusts the grinding conditions of the workpiece based on the grinding burn condition that occurs on the workpiece when the workpiece is ground and the grinding condition evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. A dimension information acquisition unit that acquires dimension information of the above-mentioned workpiece, A grinding burn disappearance dimensional information acquisition unit acquires the dimensional information acquired by the dimensional information acquisition unit as grinding burn disappearance dimensional information when the grinding burn state indicates that no grinding burn remains on the workpiece. A dimension information storage unit that stores the dimension information at the time of grinding burn loss obtained by the dimension information acquisition unit at the time of loss, A dimension information comparison unit compares the dimension information at the end of grinding, which is the dimension information acquired by the dimension information acquisition unit when the grinding burn marks disappear, with the dimension information at the time of grinding burn marks stored in the dimension information storage unit. A margin calculation unit calculates the grinding margin for the workpiece based on the comparison results of the dimensional information comparison unit, Equipped with, The grinding condition adjustment unit is part of a grinding system that adjusts the grinding conditions on the workpiece based on the calculation results of the margin calculation unit and the grinding state. (4) A fourth aspect of the present invention is a grinding system for processing the surface of a workpiece to a final target shape by grinding it multiple times, The grinding condition adjustment unit adjusts the grinding conditions of the workpiece based on the grinding burn condition that occurs on the workpiece when the workpiece is ground and the grinding condition evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. The grinding of the above workpiece includes at least a number of steps performed in the following order: rough grinding, fine grinding, micro grinding, and spark-out. The grinding condition adjustment unit described above is part of a grinding system that adjusts the grinding conditions in at least one of the fine grinding process, the micro grinding process, and the next rough grinding process of the workpiece, based on the grinding burn state and the grinding state acquired from the end of the rough grinding process to the spark-out process.

Advantages of the Invention

[0007] According to the above aspect, since the grinding conditions of the workpiece are adjusted based on the grinding burn state generated when the workpiece is ground and the above grinding state evaluated based on the amount of deflection generated in the workpiece, it becomes easy to accurately adjust the grinding conditions for preventing the remaining of grinding burn in the final workpiece.

[0008] As described above, according to the above aspect, it is possible to provide a grinding processing system capable of accurately setting the adjustment of the grinding conditions for preventing the remaining of grinding burn.

Brief Description of the Drawings

[0009] [Figure 1] Conceptual diagram showing the configuration of the grinding processing system in Embodiment 1. [Figure 2] Functional block diagram showing the schematic configuration of the processing device in Embodiment 1. [Figure 3] Diagram showing the configuration of the sizing device in Embodiment 1. [Figure 4] Diagram showing the configuration of the sizing device in the modified form. [Figure 5] Conceptual diagram showing the amount of deflection in Embodiment 1 [Figure 6] Flow chart of the control by the grinding processing system in Embodiment 1. [Figure 7] Flow chart of the grinding processing by the grinding processing system in Embodiment 1. [Figure 8] Diagram showing (a) the actual radius of the workpiece, (b) the actual depth of cut, (c) the amount of grinding burn information, and (d) the amount of change in the grinding burn state in an example in Embodiment 1. [Figure 9] Diagram showing (a) the actual radius of the workpiece, (b) the actual depth of cut, (c) the amount of grinding burn information, and (d) the amount of change in the grinding burn state in another example in Embodiment 1. [Figure 10] Flow chart of the grinding condition adjustment process in Embodiment 1. [Figure 11] Conceptual diagram showing the relationship of the grinding state in Embodiment 1. [Figure 12] A functional block diagram showing the general configuration of the processing unit in Embodiment 2. [Figure 13] Flowchart of the grinding condition adjustment process in Embodiment 2. [Figure 14] A functional block diagram showing the general configuration of the processing apparatus in Embodiment 3. [Figure 15] Flowchart of the grinding condition adjustment process in Embodiment 3. [Modes for carrying out the invention]

[0010] (Embodiment 1) 1. Configuration of Grinding System 1 The grinding system 1 in this embodiment 1 will be described with reference to Figure 1. The grinding system 1 is a processing device that performs grinding on a workpiece. The grinding system 1 comprises a grinding machine 2 as a processing device and a processing unit 3.

[0011] The grinding machine 2 grinds the outer or inner surface of the workpiece W by rotating the workpiece W around its centerline C, rotating the grinding wheel 16 which is a rotating tool, and bringing the grinding wheel 16 relatively close to the workpiece W in a direction intersecting the axis of the workpiece W. The grinding machine 2 can be a table traverse type grinding machine, a grinding wheel base traverse type grinding machine, etc. Furthermore, the grinding machine 2 can be a cylindrical grinding machine, a cam grinding machine, etc.

[0012] In this embodiment, as shown in Figure 1, the workpiece W is, for example, a member formed in the shape of an axis, and the outer surface of the workpiece W is the part to be processed. However, the shape of the workpiece W is not limited to an axis, and can be any shape, such as a cylindrical shape with an inner surface. If the workpiece W is cylindrical, the inner surface of the workpiece W can be the part to be processed.

[0013] In this embodiment, the workpiece W is substantially rod-shaped and supported at both ends by workpiece support members. However, the workpiece W shown in Figure 1 is just one example, and the grinding machine 2 can be used to grind workpieces of various shapes.

[0014] The processing unit 3 comprises a processing unit 31 that performs the processing described later, and a control device 32 that controls the grinding machine 2. As described later, the processing unit 31 adjusts the grinding conditions of the workpiece based on the grinding burn state and the grinding state. The control device 32 controls the grinding process by controlling the grinding machine 2.

[0015] The processing unit 31 can function as a simulation device independent of the grinding machine 2 and the control device 32, or as a simulation device that operates in conjunction with the grinding machine 2 and the control device 32. In the former case, the processing unit 31 can determine the optimal grinding conditions without actually grinding the workpiece W. In the latter case, the processing unit 31 can adjust the grinding conditions or operate in a way that affects various controls by processing in parallel with the grinding of the workpiece W by the grinding machine 2. Furthermore, the processing unit 31 can be integrated into the grinding machine 2 and the control device 32.

[0016] 2. Configuration of the grinding machine 2 and control device 32 The configuration of the grinding machine 2 will be described with reference to Figure 1. In this embodiment 1, the grinding machine 2 is an example of a cylindrical grinding machine with a grinding wheel base traverse. However, a table traverse type can also be used for the grinding machine 2. The grinding machine 2 mainly comprises a bed 11, a headstock 12, a tailstock 13, a traverse base 14, a grinding wheel base 15, a grinding wheel 16, a sizing device 17, a grinding wheel adjustment device 18, a coolant device 19, a burn detection sensor 20, and a displacement sensor 25.

[0017] The bed 11 is fixed to the mounting surface. The headstock 12 is located on the upper surface of the bed 11, on the front side in the X-axis direction (lower side in Figure 1) and on one end side in the Z-axis direction (left side in Figure 1). The headstock 12 supports the workpiece W so that it can rotate around the Z-axis with respect to the center line C. The workpiece W is rotated by the drive of a motor 12a provided on the headstock 12. The tailstock 13 is located on the upper surface of the bed 11, opposite the headstock 12 in the Z-axis direction, that is, on the front side in the X-axis direction (lower side in Figure 1) and on the other end side in the Z-axis direction (right side in Figure 1). In other words, the headstock 12 and tailstock 13 rotatably support the workpiece W at both ends.

[0018] The traverse base 14 is mounted 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 mounted on the bed 11. The grinding wheel base 15 is mounted on the upper surface of the traverse base 14 so as to be movable in the X-axis direction. The grinding wheel base 15 is moved by the drive of a motor 15a mounted on the traverse base 14. The grinding wheel 16 is rotatably supported on the grinding wheel base 15. The grinding wheel 16 rotates by the drive of a motor 16a mounted on the grinding wheel base 15. The grinding wheel 16 is constructed by fixing multiple abrasive grains with a bonding agent.

[0019] The sizing device 17 functions as a detector 21 for measuring the dimensions (diameter) of the workpiece W. However, the detector 21 is not limited to the sizing device 17, and may be a non-contact sensor such as a contact sensor with a single probe or a laser displacement meter.

[0020] As shown in Figure 3, the sizing device 17 mainly comprises a device body 171, a pair of sizing contacts 172a and 172b, a pair of fingers 173a and 173b, and a differential transformer 174. The sizing contacts 172a and 172b are provided so as to be able to contact the outer circumferential surface of the workpiece W. Specifically, of the pair of sizing contacts 172a and 172b, one sizing contact 172a contacts the outer circumferential surface of the workpiece W from above, and the other sizing contact 172b contacts the outer circumferential surface of the workpiece W from below. The fingers 173a and 173b hold the sizing contacts 172a and 172b and support them relative to the device body 171 so as to be able to move relative to them. Specifically, of the pair of fingers 173a and 173b, one finger 173a supports one fixed-size contactor 172a, and the other finger 173b supports the other fixed-size contactor 172b.

[0021] The differential transformer 174 is housed in the main body 171 of the device. The differential transformer 174 detects the displacement of a pair of fingers 173a and 173b that are displaced in conjunction with the displacement of a pair of fixed-size contactors 172a and 172b, and outputs an electrical signal corresponding to the displacement of the fingers 173a and 173b to the control device 32. Based on the electrical signal output from the differential transformer 174, the control device 32 detects the position of the fingers 173a and 173b when the pair of fixed-size contactors 172a and 172b contact the outer surface of the workpiece W, and can obtain the measurement result of the outer diameter of the workpiece W by the sizing device 17 based on the position of the fingers 173a and 173b. The sizing device 17 may also be equipped with other detectors 21, such as an acceleration sensor, a microphone, or a temperature sensor.

[0022] The burn detection sensor 20 detects a signal to derive the amount of grinding burn information on the workpiece W and is configured to contact the workpiece W and be displaceable according to the amount of deflection of the workpiece W. In this embodiment 1, as shown in Figure 3, the burn detection sensor 20 is biased toward the workpiece W by a spring 26, which will be described later, so that the tip of the sensor head is in contact with the workpiece W. In this embodiment 1, the burn detection sensor 20 is mounted on a support base 27 attached to the main body 171 of the sizing device 17 so as to be movable. As a result, the burn detection sensor 20 is located on the opposite side of the grinding wheel 16 from the workpiece W. In Figures 1 and 3, reference numeral 20 indicates the position of the sensor head, and the sensor body is not shown.

[0023] In this embodiment 1, the burn detection sensor 20 is provided as an eddy current sensor. The eddy current sensor, as the burn detection sensor 20, induces eddy currents inside the workpiece W by an excitation current and outputs a signal corresponding to the magnetic field generated by the eddy currents. The burn detection sensor 20 (eddy current sensor) has a coil (not shown), and by supplying an excitation current to the coil, the coil applies a magnetic field to the workpiece W and induces eddy currents inside the workpiece W. The burn detection sensor 20 (eddy current sensor) then outputs a signal of the change in the impedance of the coil due to the magnetic field created by the eddy currents. The magnitude of the eddy currents, and therefore the magnitude of the output signal, changes according to the state of the machined part of the workpiece W.

[0024] In the burn detection sensor 20 (eddy current sensor), the coil is configured to be supplied with multiple excitation currents of different frequencies. In this embodiment 1, the excitation currents include a first excitation current having a first frequency and a second excitation current having a second frequency higher than the first frequency. That is, the first excitation current can be a low-frequency current and the second excitation current can be a high-frequency current. The penetration depth of the eddy current differs depending on the frequency of the excitation current. The first eddy current caused by the low-frequency first excitation current easily penetrates to the deeper parts of the workpiece W, while the second eddy current caused by the high-frequency second excitation current penetrates to the surface part of the workpiece W. A third or fourth excitation current may also be set.

[0025] In this embodiment 1, the frequency of the first excitation current is not limited, but can be set to a frequency range of, for example, 0.1 kHz to 1.0 kHz. This allows the penetration depth of the eddy current caused by the first excitation current to coincide with the deep layer of the workpiece W, which is composed of the base material and does not reach the workpiece. On the other hand, the frequency of the second excitation current is also not limited, but can be set to a frequency range of, for example, 50 MHz to 1.0 MHz. This allows the penetration depth of the eddy current caused by the second excitation current to coincide with the surface layer of the workpiece W, which is located on the surface side of the deep layer and where grinding burn can occur. Note that each frequency band can be appropriately adjusted and set in consideration of the material and hardening state of the workpiece W in this embodiment.

[0026] In this embodiment 1, the burn detection sensor 20 (eddy current sensor) supplies a first excitation current and a second excitation current to the coil. However, when using workpieces W with substantially the same base material composition as the workpiece W to be ground, or when evaluating the grinding burn state for a single workpiece W, it is also possible to supply only an excitation current to the coil that matches the penetration depth of the eddy current to the surface layer where grinding burn can occur, and output only a signal based on the state of the surface layer where grinding burn can occur. Note that the burn detection sensor 20 is not limited to an eddy current sensor, and any sensor capable of detecting grinding burn is acceptable.

[0027] The displacement sensor 25 functions as a detector 21 that detects the amount of displacement of the burn detection sensor 20, which is biased by the spring 26 to contact the workpiece W, as described above. In this embodiment 1, as shown in Figure 3, the displacement sensor 25 and the spring 26 are attached to the main body 171 of the sizing device 17 and are located on the opposite side of the grinding wheel 16 from the workpiece W. As will be described later, the amount of deflection of the workpiece W can be calculated based on the amount of displacement of the burn detection sensor 20 of the displacement sensor 25 and the actual radius obtained by the sizing device 17. The configuration of the displacement sensor 25 may be a non-contact sensor such as a contact sensor or a laser displacement meter.

[0028] Furthermore, as shown in the modified configuration in Figure 4, a sensor contact 28 biased by a spring 26 to contact the workpiece W may be provided separately from the burn detection sensor 20, and the displacement sensor 25 may detect the displacement of the sensor contact 28. In this case, the burn detection sensor 20 can be non-contact with the workpiece W. Alternatively, the displacement sensor 25 may directly detect the displacement non-contact without the sensor contact 28 or spring 26. In this case, the burn detection sensor 20 and the displacement sensor 25 can be non-contact.

[0029] The grinding wheel correction device 18 corrects the shape of the grinding wheel 16. The grinding wheel correction device 18 is a device that performs truing of the grinding wheel 16. In addition to truing, or as an alternative to truing, the grinding wheel correction device 18 may also be a device that performs dressing of the grinding wheel 16. Furthermore, the grinding wheel correction device 18 also has a function to measure the dimensions (diameter) of the grinding wheel 16.

[0030] Here, truing is a reshaping process, which involves shaping the grinding wheel 16 to match the shape of the workpiece W when the grinding wheel 16 is worn down by grinding, and removing runout of the grinding wheel 16 caused by uneven wear. Dressing is a sharpening process, which involves adjusting the amount of abrasive grain protrusion and creating cutting edges for the abrasive grains. Dressing is a process to correct clogged, damaged, or chipped abrasive grains, and is usually performed after truing.

[0031] The coolant system 19 supplies coolant from the coolant nozzle to the grinding point of the workpiece W by the grinding wheel 16. The coolant system 19 cools the recovered coolant to a predetermined temperature and supplies it again to the grinding point. The coolant system 19 allows for adjustment of the coolant flow rate and supply timing. In Figure 1, reference numeral 19 indicates the position of the coolant nozzle. Although not shown, a temperature sensor, such as a detector 21, may also be provided to acquire the temperature of the recovered coolant.

[0032] The control device 32 grinds the workpiece W by controlling the drive of the grinding wheel 16 and coolant device 19 in the grinding machine 2 based on an NC program generated based on operation command data such as the shape of the workpiece W, grinding conditions, the shape of the grinding wheel 16, and coolant flow rate or supply timing information. In particular, the control device 32 grinds the workpiece W until it reaches the finished shape (target shape) based on the grinding conditions created by the grinding condition adjustment unit 323 (described later) and the diameter of the workpiece W measured by the sizing device 17. The control device 32 also corrects the grinding wheel 16 (truing and dressing) by controlling the grinding wheel correction device 18, etc., at the timing when the grinding wheel 16 needs to be corrected.

[0033] 3. Configuration of the processing unit 31 As shown in Figure 2, the processing apparatus 31 includes a first grinding burn information amount calculation unit 311, a second grinding burn information amount calculation unit 312, a grinding burn information amount acquisition unit 313, a grinding burn information amount storage unit 314, a grinding burn state change amount calculation unit 315, a grinding burn state evaluation unit 316, and an evaluation result display unit 317.

[0034] The first grinding burn information calculation unit 311 receives a first signal output from the burn detection sensor 20 (eddy current sensor). The first grinding burn information calculation unit 311 calculates the first grinding burn information based on the first signal. The form of the first grinding burn information is not limited and can be the change in impedance constituting the first signal, the first permeability of the first eddy current calculated based on the first signal, or a value obtained by further converting these into a predetermined information quantity.

[0035] The second grinding burn information calculation unit 312 receives the second signal output from the burn detection sensor 20 (eddy current sensor). The second grinding burn information calculation unit 312 calculates the second grinding burn information amount based on the second signal. The form of the second grinding burn information amount can be the same as the form of the first grinding burn information amount described above.

[0036] The grinding burn information acquisition unit 313 acquires the grinding burn information amount at the workpiece W from the first grinding burn information amount and the second grinding burn information amount calculated by the first grinding burn information amount calculation unit 311. In this embodiment 1, the difference between the first grinding burn information amount and the second grinding burn information amount is acquired as the grinding burn information amount. This grinding burn information amount is stored in the grinding burn information amount storage unit 314. The difference between the first grinding burn information amount and the second grinding burn information amount will change depending on whether or not grinding burn remains at the workpiece W. However, for example, in the examples shown in Figures 8(c) and 9(c), since there is material variation in the workpiece W, there is a fluctuation R that is presumed to correspond to material variation for each rotation A of the workpiece W during grinding.

[0037] In this embodiment 1, the grinding burn information acquisition unit 313 acquires the first grinding burn information amount and the second grinding burn information amount using an eddy current sensor as the detection sensor 20. However, the system is not limited to this, and the grinding burn information amount may be acquired by other means.

[0038] The grinding burn state change amount calculation unit 315 calculates the grinding burn state change amount at the target grinding time based on the grinding burn information amount at the workpiece W workpiece acquired by the grinding burn information amount acquisition unit 313 at the target grinding time (the current grinding burn information amount) and the previous grinding burn information amount at the same workpiece W workpiece stored in the grinding burn information amount storage unit. The grinding burn state change amount is calculated as the difference between the current grinding burn information amount and the previous grinding burn information amount. In this embodiment 1, the previous grinding burn information amount is the grinding burn information amount acquired at the target grinding time one rotation before the workpiece W. As shown in Figures 8(d) and 9(d), there is no fluctuation R that is presumed to correspond to material variation during one rotation A of the workpiece W being ground, and therefore material variation does not affect the grinding burn state change amount in any way.

[0039] The grinding burn state evaluation unit 316 evaluates whether grinding burn remains in the workpiece W based on the grinding burn state change amount calculated by the grinding burn state change amount calculation unit 315. If grinding burn remains in the surface layer of the workpiece W, when at least a portion of the grinding burn is removed by grinding the workpiece, the material composition (the ratio of the part where grinding burn remains to the part where it does not) from the deep layer to the surface layer of the workpiece changes. Therefore, the grinding burn state change amount, which is the calculation result of the grinding burn state change amount calculation unit 315, that is, the difference between the current grinding burn information amount and the previous grinding burn information amount, will change. On the other hand, if no grinding burn remains in the surface layer, grinding the workpiece W will not change the material composition from the deep layer to the surface layer of the workpiece. Therefore, the grinding burn state change amount, which is the calculation result of the grinding burn state change amount calculation unit 315, will also not change.

[0040] As described above, the grinding burn state evaluation unit 316 evaluates that grinding burn remains on the workpiece W if the above difference, which is the calculation result of the grinding burn state change amount calculation unit 315, has changed, and evaluates that grinding burn does not remain on the workpiece W if it has not. The timing at which the grinding burn state evaluation unit 316 changes from an evaluation that grinding burn remains to an evaluation that grinding burn does not remain is the timing at which the grinding burn has disappeared from the workpiece W.

[0041] Furthermore, for example, in cases where the material variation during one rotation A of the workpiece W is small, or where material variation is not considered, the grinding burn state evaluation unit 316 may evaluate the grinding burn state using the difference between the first grinding burn information amount and the second grinding burn information amount shown in Figures 8(c) and 9(c), instead of the grinding burn state change amount P shown in Figures 8(d) and 9(d).

[0042] As shown in Figure 2, the processing apparatus 31 further includes a dimensional information acquisition unit 318, a deflection amount calculation unit 330, a grinding state evaluation unit 331, and a grinding condition adjustment unit 323.

[0043] The dimension information acquisition unit 318 acquires the actual radius of the workpiece W using the measuring device 17 as a detector 21. As shown in Figure 3, half the distance between T1 and T2 is acquired as the actual radius of the workpiece W.

[0044] The deflection calculation unit 330 calculates the deflection amount of the workpiece W based on the dimensional information of the workpiece W obtained by the dimensional information acquisition unit 318. In this embodiment 1, the total deflection amount Ta is calculated first as the deflection amount. The total deflection amount Ta can be expressed as the sum of the grinding deflection amount Tk and the dynamic pressure deflection amount Td.

[0045] The grinding deflection Tk includes the elastic deflection Te. The dynamic pressure deflection Td is the amount of deflection that occurs in the workpiece W due to the supplied coolant, and is proportional to the coolant flow rate. The grinding deflection Tk is the amount of deflection that occurs when the workpiece W is actually cut by the grinding wheel 16. The elastic deflection Te is the amount of deflection of the workpiece W in the elastic resistance region where grinding by the grinding wheel 16 does not occur and the workpiece W undergoes elastic deformation.

[0046] In this embodiment 1, as shown in Figure 3, considering that the position where the fixed-size contact element 172a (172b) contacts the workpiece W and the position where the sensor head of the burn detection sensor 20 contacts it are offset by 90° with respect to the rotation center of the workpiece W, the total deflection amount Ta can be expressed as B - (actual radius before 90°).

[0047] Each deflection amount changes, for example, as shown in Figure 5, during the grinding processes S11 to S14 described later. The actual depth of cut shown in Figure 5 can be calculated as the difference between the distance between T1 and T2 in the previous step and the distance between T1 and T2 in the current step. As shown in Figure 5, the actual depth of cut changes based on the command values ​​in each grinding process S11 to S14, and the total deflection amount Ta changes based on this. The deflection amount calculation unit 330 then calculates the grinding deflection amount Tk from the total deflection amount Ta and the dynamic pressure deflection amount Td as the deflection amount of the workpiece W.

[0048] The grinding state evaluation unit 331 calculates grinding characteristics based on the amount of deflection of the workpiece W calculated by the deflection amount calculation unit 330. Examples of grinding characteristics include the grinding normal resistance of the grinding wheel 16 at the processing position, the grinding wheel sharpness, which is the sharpness of the grinding wheel 16, the coolant dynamic pressure which is proportional to the coolant flow rate and grinding wheel sharpness, and the elastic region resistance of the workpiece W, and can include at least one of these. The grinding state evaluation unit 331 then displays the grinding characteristics corresponding to the amount of deflection as an evaluation result.

[0049] The grinding condition adjustment unit 323 adjusts the grinding conditions for grinding the workpiece W based on the evaluation results of the grinding burn state evaluation unit 316 and the evaluation results of the grinding condition evaluation unit 331. In this embodiment 1, if the evaluation result of the grinding burn state evaluation unit 316 at the end of the rough grinding process S11, which will be described later, indicates that grinding burn remains, the grinding conditions can be adjusted in subsequent processes by referring to the grinding characteristics in the evaluation results of the grinding condition evaluation unit 331 to increase the grinding amount in the fine grinding process S13 and the fine grinding process S14, or by adjusting the grinding conditions to decrease the grinding efficiency in the rough grinding process S11 of the next workpiece W. When increasing the grinding amount in the fine grinding process S13 and the fine grinding process S14, this can be done within the tolerance range of the target shape that has been set in advance.

[0050] In adjusting the grinding conditions using the grinding condition adjustment unit 323, the grinding efficiency can be changed (increased or decreased) by changing the cutting depth and cutting speed of the grinding wheel 16, the coolant flow rate, and the dress lead of the grinding wheel 16.

[0051] The grinding conditions adjusted by the grinding condition adjustment unit 323 are output to the control device 32, and the control device 32 grinds the workpiece W using the grinding machine 2 according to the said grinding conditions.

[0052] 4. Processing using grinding system 1 As shown in Figure 6, the grinding system 1 performs the grinding process S1 and the grinding condition adjustment process S2 in parallel. 4-1. Explanation of Grinding Process First, let's explain the grinding process S1. As shown in Figure 7, the grinding process S1 includes a rough grinding step S11, a fine grinding step S12, a micro grinding step S13, and a spark-out step S14.

[0053] In the rough grinding process S11, the control device 32 rotates the grinding wheel 16 at a predetermined speed based on operation command data such as the shape of the workpiece W, grinding conditions, the shape of the grinding wheel 16, and the flow rate or supply timing information of the coolant, and grinds the workpiece W with a first depth of cut. In the fine grinding process S12, the control device 32 grinds the workpiece W with a second depth of cut lower than the first depth of cut. In the fine grinding process S13, the control device 32 grinds the workpiece W with a third depth of cut lower than the second depth of cut. In the spark-out process S14, the workpiece W is rotated at a preset rotational speed to grind away the remaining material from the fine grinding process S13, making the cross-sectional shape a perfect circle. In the spark-out process S14, the depth of cut is 0, but the workpiece W retains an elastic deflection amount Td, which is the amount of deflection due to elastic resistance. The depth of cut can be adjusted by controlling the cutting position of the grinding wheel 16 using the control device 32.

[0054] In this embodiment 1, the first to third cutting depths in each process S11 to S13 are set as shown in Figure 8(b) or Figure 9(b), for example. In the spark-out process S14, the actual cutting depth is substantially zero. In each process S11 to S14, the coolant flow rate and other parameters are appropriately controlled by the coolant device 19 in accordance with the cutting depth.

[0055] 4-2. Explanation of Grinding Condition Adjustment Process S2 The grinding condition adjustment process S2 shown in Figure 10 will be described below. As shown in Figure 10, the grinding burn determination process first involves a first parallel process, in step S211, where the first grinding burn information amount calculation unit 311 receives a first signal from the burn detection sensor 20 (eddy current sensor) at the target grinding time and calculates the first permeability as the first grinding burn information amount. In addition, the second grinding burn information amount calculation unit 312 receives a second signal from the burn detection sensor 20 (eddy current sensor) at the target grinding time and calculates the second permeability as the first grinding burn information amount.

[0056] Next, in step S212, the grinding burn information acquisition unit 313 acquires the difference between the first permeability and the second permeability as the grinding burn information amount at the target grinding time (the grinding burn information amount for this time).

[0057] Subsequently, in step S213, the grinding burn state change amount calculation unit 315 obtains the difference between the current grinding burn information amount and the previous (one rotation earlier) grinding burn information amount for the same workpiece W stored in the grinding burn information amount storage unit 314 as the grinding burn state change amount.

[0058] Furthermore, as a second parallel processing step, in step S221, the actual radius of the workpiece W is detected by the sizing device 17, and the displacement of position B on the workpiece W is detected by the displacement sensor 25. Then, in step S222, the deflection amount calculation unit 330 calculates the deflection amount of the workpiece W at the target grinding time. Subsequently, in step S223, the grinding state evaluation unit 331 calculates grinding characteristics as an evaluation result.

[0059] Then, after the first and second parallel processing, in step S25, the grinding burn state evaluation unit 316 determines whether the amount of change in the grinding burn state by the spark-out process S14 is less than or equal to a predetermined value. In this embodiment 1, it is determined whether the absolute value of the amount of change in the grinding burn state has become approximately zero. For example, in the example shown in Figure 8(d), the absolute value of the amount of change in the grinding burn state P has become approximately zero by the spark-out process S14.

[0060] If it is determined that the amount of change in the grinding burn state is less than or equal to a predetermined value, the process proceeds to Yes in step S25, and in step S26, the grinding burn state evaluation unit 316 evaluates that there is no residual grinding burn on the workpiece W. Then, in step S27, the evaluation result of the grinding burn state evaluation unit 316 and the evaluation result of the grinding state evaluation unit 331 are displayed by the evaluation result display unit 317.

[0061] Subsequently, the process proceeds to step S28, where the grinding condition adjustment unit 323 adjusts the grinding conditions so as to increase the grinding efficiency of the rough grinding step S11 for the next workpiece W, without changing the initial depth of cut in the fine grinding step S12 and / or fine grinding step S13 for the judgment transition. This adjustment of the grinding conditions is performed by changing at least one of the grinding feature quantities based on the evaluation result of the grinding state evaluation unit 331.

[0062] For example, if the actual depth of cut and the sharpness of the grinding wheel, as grinding characteristics, have the relationship shown in Figure 11(a), and the sharpness of the grinding wheel and the dynamic pressure of the coolant have the relationship shown in Figure 11(b), then the grinding conditions for increasing grinding efficiency can be adjusted to increase the actual depth of cut while maintaining the actual depth of cut and the sharpness of the grinding wheel, which are evaluation results, within the normal range below the standard Q1 shown in Figure 11(a), and while maintaining the sharpness of the grinding wheel and the dynamic pressure of the coolant, which are evaluation results, within the normal range above the standard Q2 shown in Figure 11(b).

[0063] Next, if it is determined that the amount of change in the grinding burn state is not below a predetermined value, for example, as shown in the example in Figure 9(d), if the absolute value of the amount of change in the grinding burn state P is not approximately zero from after the rough grinding process S11 to the spark-out process S14, the process proceeds to step S25. Then, in step S29, the grinding burn state evaluation unit 316 evaluates that there is residual grinding burn on the workpiece W. Then, in step S30, the evaluation result of the grinding burn state evaluation unit 316 and the evaluation result of the grinding state evaluation unit 331 are displayed by the evaluation result display unit 317.

[0064] Subsequently, the process proceeds to step S31, where the grinding condition adjustment unit 323 adjusts the grinding conditions so that the depth of cut in the fine grinding step S12 and the fine grinding step S13 of the workpiece W is increased within the tolerance range of the target shape, while reducing the grinding efficiency of the rough grinding step S11 of the next workpiece W. This adjustment of the grinding conditions is performed by changing at least one of the grinding feature quantities based on the evaluation results of the grinding state evaluation unit 331. Then, the grinding condition adjustment process is terminated.

[0065] For example, if the actual depth of cut and the sharpness of the grinding wheel, as grinding characteristics, show the relationship shown in Figure 11(a), and the sharpness of the grinding wheel and the dynamic pressure of the coolant show the relationship shown in Figure 11(b), then the grinding conditions to reduce grinding efficiency can be adjusted by reducing the actual depth of cut while maintaining the actual depth of cut and the sharpness of the grinding wheel, which are evaluation results, within the normal range below the standard Q1 shown in Figure 11(a), and maintaining the sharpness of the grinding wheel and the dynamic pressure of the coolant, which are evaluation results, within the normal range above the standard Q2 shown in Figure 11(b).

[0066] In the example shown in Figure 9(d), the spark-out process S14 is performed when the absolute value of the change in grinding burn state P is not approximately zero. However, if there is sufficient grinding margin on the workpiece W relative to the target shape, the fine grinding process S12 or the fine grinding process S13 may be performed until the absolute value of the change in grinding burn state P is approximately zero, before performing the spark-out process S14.

[0067] 5. Effects In the grinding system 1 of this embodiment 1, the grinding conditions of the workpiece are adjusted based on the grinding burn state that occurs when the workpiece W is ground and the grinding state evaluated based on the amount of deflection that occurs in the workpiece. This makes it easy to adjust the grinding conditions with high precision to prevent grinding burn from remaining on the final workpiece.

[0068] Furthermore, in Embodiment 1, the displacement sensor 25 for detecting deflection, the spring 26, and the burn detection sensor 20 are provided in the sizing device 17. Therefore, the configuration of the grinding system 1 of Embodiment 1 can be easily applied to existing grinding systems.

[0069] Furthermore, the grinding system 1 of this embodiment 1 includes: a grinding burn information acquisition unit 313 that acquires the amount of grinding burn information at the workpiece W; a grinding burn information storage unit 314 that stores the grinding burn information at the workpiece W acquired by the grinding burn information acquisition unit 313; a grinding burn state change amount calculation unit 315 that calculates the grinding burn state change amount based on the grinding burn information at the workpiece W acquired at the target grinding time and the previous grinding burn information at the same workpiece W stored in the grinding burn information storage unit 314; a grinding burn state evaluation unit 316 that evaluates the grinding burn state at the workpiece W based on the grinding burn state change amount acquired by the grinding burn state change amount calculation unit 315; a deflection amount calculation unit 330 that acquires the deflection amount of the workpiece W; and a grinding state evaluation unit 331 that calculates grinding feature quantities based on the deflection amount acquired at the target grinding time and evaluates the grinding state. The grinding condition adjustment unit 323 then adjusts the grinding conditions based on the evaluation results of the grinding burn state evaluation unit 316 and the grinding condition evaluation unit 331. This makes it easy to adjust the grinding conditions with high precision to prevent grinding burn from remaining on the final workpiece.

[0070] Furthermore, in this embodiment 1, the grinding of the workpiece W includes at least a number of steps performed in the order of a rough grinding step S11, a fine grinding step S12, a micro grinding step S13, and a spark-out step S14. The grinding condition adjustment unit 323 adjusts the grinding conditions in at least one of the fine grinding step S12, the micro grinding step S13, and the rough grinding step S11 of the next workpiece W, based on the grinding burn state and grinding state acquired from the end of the rough grinding step S11 to the spark-out step S14. This makes it possible to adjust the grinding conditions in-process during the grinding process in which the grinding burn state and grinding state were acquired, and also to adjust the grinding conditions in the grinding process of the next workpiece. Therefore, the grinding conditions can be adjusted early, preventing residual grinding burn and improving productivity.

[0071] Furthermore, in this embodiment 1, the grinding state is at least one of the grinding normal resistance, grinding wheel sharpness, coolant dynamic pressure, and elastic region resistance, which are obtained as grinding feature quantities. This makes it easy to adjust the grinding conditions by using these grinding feature quantities when adjusting the grinding conditions.

[0072] Furthermore, this embodiment 1 includes an evaluation result display unit 317 that displays the grinding burn state and the grinding state. This allows for easy recognition of the evaluation results.

[0073] As described above, according to this embodiment 1, a grinding system 1 can be provided that can set grinding conditions to prevent residual grinding burn with high precision.

[0074] (Embodiment 2) In this second embodiment, as shown in Figure 12, in addition to the configuration of the first embodiment, it includes a grinding burn disappearance dimensional information acquisition unit 319, a dimensional information storage unit 320, a dimensional information comparison unit 321, and a margin calculation unit 322. The other components are the same as in the first embodiment, and are given the same reference numerals as in the first embodiment, and their descriptions are omitted.

[0075] The grinding burn disappearance dimensional information acquisition unit 319 acquires the actual radius of the workpiece W at the time the grinding burn disappears, as grinding burn disappearance dimensional information, based on the grinding burn state evaluation unit 316. This grinding burn disappearance dimensional information is then stored in the dimensional information storage unit 320.

[0076] The dimension information comparison unit 321 compares the dimension information at the end of grinding, which is the dimension information acquired by the dimension information acquisition unit 318 when grinding of the workpiece W is completed, with the dimension information at the time of grinding burn disappearance, which is stored in the dimension information storage unit. In this embodiment 2, the dimension information comparison unit 321 calculates the difference between the actual radius of the workpiece W at the end of grinding, which is the dimension information at the end of grinding, and the actual radius of the workpiece W at the time of grinding burn disappearance, as the result of this comparison.

[0077] The margin calculation unit 322 then calculates the grinding margin for the workpiece W based on the comparison result of the dimensional information comparison unit 321. In this embodiment 2, the difference between the actual radius of the workpiece W at the end of grinding and the actual radius of the workpiece W when the grinding burn disappears, which is the comparison result of the dimensional information comparison unit 321, is used as the margin calculation result in the margin calculation unit 322.

[0078] During the period from the time when grinding burn disappears from the workpiece W to the end of grinding, the workpiece W being ground is made of a base material that does not have grinding burn. Therefore, even if grinding burn remained in the area being ground during that period before the period began, the residual grinding burn in this area will be ground away and disappear by the end of grinding. Consequently, the area being ground during that period, that is, the area corresponding to the difference between the actual radius of the workpiece W at the end of grinding (which is the dimensional information at the end of grinding) and the actual radius of the workpiece W when the grinding burn disappears, may have grinding burn remaining during the grinding process. Therefore, the difference between the actual radius of the workpiece W at the end of grinding and the actual radius of the workpiece W when the grinding burn disappears, which is the result of the margin calculation unit 322, can be considered as the margin against grinding burn.

[0079] The grinding condition adjustment unit 323 adjusts the grinding conditions for the workpiece based on the calculation results of the margin calculation unit 322 and the evaluation results of the grinding condition evaluation unit. As described above, since grinding burn may occur in the region corresponding to the difference between the actual radius of the workpiece W at the end of grinding and the actual radius of the workpiece W when the grinding burn disappears, the grinding condition adjustment unit 323 can adjust the grinding conditions so that grinding burn may occur during grinding. In other words, the grinding conditions can be adjusted to increase the grinding efficiency in the rough grinding process in the next grinding.

[0080] On the other hand, if the evaluation result of the grinding burn condition evaluation unit 316 indicates that grinding burn remains, the grinding condition adjustment unit 323 can adjust the grinding conditions to reduce the grinding efficiency in the rough grinding step S11 during the next grinding. The grinding efficiency can be changed (increased or decreased) by changing the cutting depth and cutting speed of the grinding wheel 16, or by changing the dress lead of the grinding wheel 16.

[0081] The grinding conditions adjusted by the grinding condition adjustment unit 323 are output to the control device 32, and the control device 32 grinds the workpiece W using the grinding machine 2 according to the said grinding conditions.

[0082] 6. Explanation of grinding condition adjustment process S2 In the grinding condition adjustment process S2 in this embodiment 2, first, the same process as in the case of embodiment 1 shown in Figure 10 and the process from steps S211 to S27 is performed. Then, as shown in Figure 13, after step S27, the process proceeds to step S281, in which the dimensional information acquisition unit 318 acquires the actual radius of the workpiece W as dimensional information of the workpiece W after the spark-out process S14 using the dimensional information acquisition unit 318 and the dimensional device 17 as the detector 21.

[0083] Subsequently, in step S282, the dimensional information comparison unit 321 compares the actual radius of the workpiece W after the spark-out process S14 with the actual radius of the workpiece W at the time of grinding burn disappearance T1, which is stored in the dimensional information storage unit 320, and calculates the difference between the two. This difference is expressed as the difference M between the actual radius D1 of the workpiece W at the time of grinding burn disappearance T1 and the actual radius D2 of the workpiece W after the spark-out process S14, as shown in Figure 8(a) in Embodiment 1. The margin calculation unit 322 calculates this difference M as the grinding margin.

[0084] Then, in step S283, the grinding condition adjustment unit 323 adjusts the grinding conditions for grinding the next workpiece W in order to increase the grinding efficiency so that the margin M approaches zero. This adjustment of the grinding conditions is performed by changing at least one of the grinding feature quantities based on the evaluation result of the grinding state evaluation unit 331.

[0085] 7. Effects The grinding system 1 of this second embodiment includes: a dimension information acquisition unit 318 that acquires dimension information of the workpiece W; a grinding burn disappearance dimension information acquisition unit 319 that acquires the dimension information acquired by the dimension information acquisition unit 318 as grinding burn disappearance dimension information when the grinding burn state indicates that no grinding burn remains on the workpiece; a dimension information storage unit 320 that stores the grinding burn disappearance dimension information acquired by the grinding burn disappearance dimension information acquisition unit 319; a dimension information comparison unit 321 that compares the grinding completion dimension information, which is the dimension information acquired by the dimension information acquisition unit 318 when grinding of the workpiece W is completed, with the grinding burn disappearance dimension information stored in the dimension information storage unit 320; and a margin calculation unit 322 that calculates the grinding margin M on the workpiece W based on the comparison result of the dimension information comparison unit 321. The grinding condition adjustment unit 323 adjusts the grinding conditions on the workpiece W based on the calculation result of the margin calculation unit 322 and the grinding state.

[0086] This allows for adjustment of grinding conditions with greater precision, as a margin of error M is taken into consideration. Furthermore, grinding efficiency can be increased within the range where grinding burn does not remain, thus shortening the grinding cycle. In this second embodiment, the same effects and advantages as in the first embodiment are achieved.

[0087] (Embodiment 3) This third embodiment includes, in addition to the configuration of the first embodiment shown in Figure 2, an explanatory variable acquisition unit 41, a target variable acquisition unit 42, a model creation unit 43, and a trained model storage unit 44, as shown in Figure 14. The explanatory variable acquisition unit 41 acquires explanatory variables for creating a trained model. The target variable acquisition unit 42 acquires the target variable for creating a trained model. The model creation unit 43 creates a trained model from the acquired explanatory variables and target variable. The trained model storage unit 44 stores the created trained model. In this third embodiment, components equivalent to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0088] 8. Creating a pre-trained model In this third embodiment, a trained model is created before performing the grinding condition adjustment process. To create the trained model, first, grinding is performed on a workpiece W for training model creation as training data, and the grinding state (grinding features) at the time of grinding is acquired as an explanatory variable by the explanatory variable acquisition unit 41. Then, in the grinding of the workpiece W for training model creation, the burn depth obtained by evaluating the grinding burn state in the same manner as in the first embodiment is acquired as the objective variable by the objective variable acquisition unit 42.

[0089] Then, the model creation unit 43 creates a trained model using the grinding state (grinding features) obtained by the explanatory variable acquisition unit 41 and the evaluation result of the grinding burn state (burn depth) obtained by the target variable acquisition unit 42 as training data. The form of the trained model created by the model creation unit 43 is not limited and may be created by machine learning based on the training data. Furthermore, the trained model may constitute a neural network.

[0090] Furthermore, this third embodiment further includes a grinding burn depth estimation unit 324. The grinding burn depth estimation unit 324 evaluates whether or not grinding burn depth remains on the workpiece W at the target grinding time, based on the grinding burn depth obtained using the learned model stored in the learned model storage unit 44 and the actual depth of cut obtained by the dimensional information acquisition unit 318.

[0091] 9. Grinding condition adjustment process S2 The grinding condition adjustment process S2 in this third embodiment will be explained with reference to Figure 15. First, as shown in Figure 15, steps S221 to S223 are performed as in the first embodiment. In this third embodiment, steps S211 to S213, which are the first parallel processing steps in the first embodiment, are not performed.

[0092] After step S223, the process proceeds to step S250, where the grinding burn depth estimation unit 324 estimates the grinding burn depth and determines whether or not there is any residual grinding burn. Specifically, in step S250, the grinding burn depth estimation unit 324 estimates the grinding burn depth based on the learned model stored in the learned model storage unit 44 and compares it with the actual depth of cut obtained by the dimension information acquisition unit 318 to determine whether or not there is any residual grinding burn. If, in step S250, it is determined that there is no residual grinding burn on the workpiece W at the target grinding time, the process proceeds to Yes in step S250, and then steps S26 to S28 are performed as in the first embodiment. Thus, in this third embodiment, in step S28, the grinding condition adjustment unit 323 adjusts the grinding conditions based on the estimation result from the grinding burn depth estimation unit 324 and the evaluation result from the grinding condition evaluation unit 331.

[0093] On the other hand, if it is determined in step S250 that grinding burn remains on the workpiece W at the target grinding time, the process proceeds to step S250 No., and thereafter steps S29 to S31 are performed in the same manner as in Embodiment 1. Thus, in Embodiment 3, in step S31, the grinding condition adjustment unit 323 adjusts the grinding conditions based on the estimation result by the grinding burn depth estimation unit 324 and the evaluation result by the grinding state evaluation unit 331. In Embodiment 3, in step S30, the grinding burn depth remaining on the workpiece W is displayed based on the estimation result by the grinding burn depth estimation unit 324.

[0094] 10. Effects According to this embodiment 3, by creating the above-mentioned trained model in advance and using the trained model, it is possible to obtain the grinding burn state evaluation result (burn depth) as the objective variable from the grinding state as the explanatory variable. Therefore, when adjusting the grinding conditions, it is not necessary to obtain grinding burn information using a detector such as the burn detection sensor 20 (eddy current sensor), thus reducing the computational load for adjusting the grinding conditions.

[0095] Furthermore, the same effects and advantages as in Embodiment 1 are achieved in Embodiment 3 as well. In addition, in Embodiment 3, as in Embodiment 1, the evaluation results of the grinding burn state may be obtained and used to evaluate or update the trained model.

[0096] The present invention is not limited to the embodiments described above, and can be applied to various embodiments without departing from its spirit. [Explanation of symbols]

[0097] 1. Grinding System 2. Grinding machine 31 Processing Unit 32 Control device 313 Grinding burn information acquisition unit 314 Grinding burn information storage unit 315 Grinding burn state change amount calculation unit 316 Grinding burn condition evaluation unit 317 Grinding burn evaluation result display section 318 Dimensional Information Acquisition Unit 319 Unit for acquiring dimensional information when grinding burn marks disappear 320 Dimensional Information Storage Unit 321 Dimensional Information Comparison Section 322. Calculation unit for margin 323 Grinding Condition Adjustment Section 324 Grinding burn depth estimation section 330 Deflection Amount Calculation Unit 331 Grinding condition evaluation unit

Claims

1. A grinding system that processes the surface of a workpiece to its final target shape by grinding it multiple times, The grinding condition adjustment unit adjusts the grinding conditions of the workpiece based on the grinding burn condition that occurs on the workpiece when the workpiece is ground and the grinding condition evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. A grinding burn information acquisition unit acquires the amount of grinding burn information in the workpiece portion of the above workpiece, A grinding burn information storage unit stores the amount of grinding burn information in the workpiece portion of the workpiece acquired by the grinding burn information acquisition unit, A grinding burn state change amount calculation unit calculates the grinding burn state change amount based on the amount of grinding burn information at the workpiece acquired at the target grinding time and the previous grinding burn information amount at the same workpiece stored in the grinding burn information amount storage unit, A grinding burn state evaluation unit evaluates the grinding burn state in the workpiece based on the grinding burn state change amount obtained by the grinding burn state change amount calculation unit, A deflection amount acquisition unit that acquires the amount of deflection of the above workpiece, A grinding state evaluation unit calculates grinding characteristics based on the amount of deflection obtained at the target grinding time and evaluates the grinding state, Equipped with, The grinding condition adjustment unit adjusts the grinding conditions based on the evaluation results of the grinding burn state evaluation unit and the grinding condition evaluation unit in the grinding processing system.

2. A burn detection sensor is configured to detect a signal for deriving the above grinding burn information amount, and to contact the workpiece and be displaceable according to the deflection of the workpiece. A displacement sensor that detects the amount of displacement of the burn detection sensor mentioned above, Equipped with, The above grinding burn information acquisition unit acquires the grinding burn information based on the signal detected by the burn detection sensor. The grinding system according to claim 1, wherein the deflection amount acquisition unit acquires the amount of deflection of the workpiece based on the amount of displacement detected by the displacement sensor.

3. A grinding system for processing the surface of a workpiece to a final target shape by grinding it multiple times, The grinding condition adjustment unit adjusts the grinding conditions of the workpiece based on the grinding burn condition that occurs on the workpiece when the workpiece is ground and the grinding condition evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. A model storage unit stores a trained model in which the above grinding state is used as the explanatory variable and the above grinding burn state is used as the objective variable. A grinding burn depth estimation unit estimates the grinding burn depth in the workpiece based on the grinding burn state obtained using the trained model at the target processing time, A deflection amount acquisition unit that acquires the amount of deflection of the above workpiece, A grinding state evaluation unit calculates grinding characteristics based on the amount of deflection obtained at the target grinding time and evaluates the grinding state, Equipped with, The grinding condition adjustment unit adjusts the grinding conditions based on the estimation result of the grinding burn depth estimation unit and the evaluation result of the grinding condition evaluation unit in the grinding processing system.

4. A grinding system for processing the surface of a workpiece to a final target shape by grinding it multiple times, The grinding condition adjustment unit adjusts the grinding conditions of the workpiece based on the grinding burn condition that occurs on the workpiece when the workpiece is ground and the grinding condition evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. A dimension information acquisition unit that acquires dimension information of the above-mentioned workpiece, A grinding burn disappearance dimensional information acquisition unit acquires the dimensional information acquired by the dimensional information acquisition unit as grinding burn disappearance dimensional information when the grinding burn state indicates that no grinding burn remains on the workpiece. A dimension information storage unit that stores the dimension information at the time of grinding burn loss obtained by the dimension information acquisition unit at the time of loss, A dimension information comparison unit compares the dimension information at the end of grinding, which is the dimension information acquired by the dimension information acquisition unit when the grinding burn disappears, with the dimension information stored in the dimension information storage unit. A margin calculation unit calculates the grinding margin for the workpiece based on the comparison results of the dimensional information comparison unit, Equipped with, The grinding condition adjustment unit is a grinding system that adjusts the grinding conditions on the workpiece based on the calculation result of the margin calculation unit and the grinding state.

5. A grinding system for processing the surface of a workpiece to a final target shape by grinding it multiple times, The grinding condition adjustment unit adjusts the grinding conditions of the workpiece based on the grinding burn condition that occurs on the workpiece when the workpiece is ground and the grinding condition evaluated based on the amount of deflection that occurs in the workpiece when the workpiece is ground. The grinding of the above workpiece includes at least a number of steps performed in the following order: rough grinding, fine grinding, micro grinding, and spark-out. The grinding condition adjustment unit adjusts the grinding conditions in at least one of the fine grinding process, the micro grinding process, and the next workpiece rough grinding process, based on the grinding burn state and grinding state acquired from the end of the rough grinding process to the spark-out process.

6. The grinding system according to any one of claims 1 to 3, wherein the grinding state described above is at least one of the grinding normal resistance, grinding wheel sharpness, coolant dynamic pressure, and elastic region resistance obtained as grinding characteristic quantities.

7. A grinding system according to any one of claims 1 to 3, comprising a display unit that displays at least one of the above-mentioned grinding burn state, the above-mentioned grinding burn depth, and the above-mentioned grinding state.

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