Chip breakage prediction device, control device, and chip breakage prediction method

Abstract

The chip breakage prediction device includes: a storage unit that stores information related to the workpiece and tool in the cutting process; a receiving unit that receives information related to the workpiece and tool used in the cutting process, selected from the information stored in the storage unit, and receives information indicating the feed rate and depth of cut in the cutting process; a calculation unit that uses the information received by the receiving unit to derive information for predicting whether the chip can be broken; and a display unit that displays the information for predicting whether the chip can be broken derived by the calculation unit.

Description

Chip breaking property prediction device, control device and chip breaking property prediction method The present invention relates to a chip breaking property prediction device, a control device and a chip breaking property prediction method. Generally, chip breaking performance is determined by the tool manufacturer's catalog, which lists the appropriate range for chip breakers. However, this range varies significantly depending on the material, and is often inappropriate. Therefore, the optimal conditions are typically determined by varying the conditions and tools, and conducting extensive experimentation. At the research level, there are efforts to predict chip breakability using finite element method (FEM) analysis software, as described in the following non-patent document 1. This document describes analyzing the chip breakage process using the thermoelastic finite element method, confirming agreement with experimental results. However, FEM analysis requires a long time to analyze each condition, making it unsuitable for predicting chip breakability across a large number of tools or under a wide range of conditions. There are also efforts to theoretically understand chip breakage (for example, see Non-Patent Document 2 below). As disclosed in Non-Patent Document 2, the conditions for chip breakage can be determined by using the chip fracture strain determined by the chip material and the tensile strain generated in the chip, which is calculated based on the chip thickness and the initial curling radius of the chip. Non-patent document 1 presents a theoretical study using the thermoelastic finite element method, and non-patent document 2 presents a theoretical understanding of chip breakage. However, these non-patent documents present only general theoretical studies. Therefore, these theoretical studies may not necessarily be used directly when setting cutting conditions for a specific workpiece during cutting. [Prior Art Document] [Non-patent Document] [Non-patent document 1] "Thermoelastic-plastic finite element method simulation experiment of chip fracture process using chip breaker", Shinozuka et al., "Journal of the Japan Society of Precision Engineering", Vol. 62, No. 8, p1161-1166, 1996 [Non-patent document 2] "Study on chip breaker", Kazuo Nakayama, "Proceedings of the Japan Society of Mechanical Engineers (Volume 3)", Vol. 27, No. 178, p833-843, 1961. An object of the present invention is to facilitate setting of cutting conditions when cutting is performed. A chip breakability prediction device according to one aspect of the present invention includes: a storage unit storing information related to a workpiece and a tool in a cutting process; a receiving unit configured to receive information related to a workpiece to be cut and a tool used, selected from the workpiece and tool indicated in the information stored in the storage unit, and to receive information indicating a feed speed and a cutting depth in the cutting process; a calculation unit configured to derive information for predicting whether the chip can be broken using the information received by the receiving unit; and a display unit configured to display the information derived by the calculation unit for predicting whether the chip can be broken. According to one aspect of the present invention, a control device is provided in a prediction system for predicting the breakability of chips in cutting processing, and is connected to an input-output device in a communicative manner. The control device includes: a storage unit storing information related to the workpiece and tool in the cutting processing; a receiving unit configured to receive information related to the workpiece and tool selected as the object of cutting processing and the tool used in the input-output device from the workpiece and tool shown in the information stored in the storage unit, and to receive information representing the feed speed and cutting amount in the cutting processing from the input-output device; a calculation unit configured to use the information received by the receiving unit to derive information for predicting whether the chips can be broken; and a communication unit configured to communicate with the input-output device to display the information for predicting whether the chips can be broken, which is derived by the calculation unit, on a display unit of the input-output device. In one aspect of the present invention, in a chip breaking property prediction method, a receiving unit receives information related to the workpiece and tool in the cutting process selected from the information stored in the storage unit, and the workpiece and tool used to be the object of the cutting process are received by the receiving unit, and information representing the feed speed and cutting amount in the cutting process is received by the receiving unit. Using the information received by the receiving unit, the calculation unit derives information for predicting whether the chip can be broken, and the information derived by the calculation unit is displayed on the display unit. In one aspect of the present invention, a chip breaking property prediction method is provided, wherein information related to the workpiece and tool in the cutting process, which are selected from the information stored in the storage unit and are related to the workpiece to be cut and the tool used, is received from an input-output device, and information representing the feed speed and the amount of cut in the cutting process is received from the input-output device, and information for predicting whether the chip can be broken when the workpiece, tool, feed speed and amount of cut in are represented by the received information is derived by a calculation unit, and communication is performed with the input-output device by a communication unit to display the information derived by the calculation unit on the display unit of the input-output device. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (First Embodiment) As shown in FIG1 , a chip breaking performance prediction device 10 according to the first embodiment includes a control unit 12 for performing computational processing, a storage unit 14 for storing processing programs and data, and an input / output unit 16 for inputting and outputting information. The control unit 12 includes a central processing unit (CPU) and utilizes the CPU to perform various computations. When performing computations, the control unit 12 utilizes information input from the input / output unit 16 and information stored in the storage unit 14. The storage unit 14 stores information related to the workpiece being cut (workpiece information 14a) and information related to the tool (tool information 14b). The workpiece information 14a includes information related to the name of the workpiece, fracture strain values, shear angles, and other information. The tool information 14b includes information related to the name of the tool holder, information related to the name of the blade, and data indicating the cross-sectional shape of the blade in a predetermined direction. In addition, the storage unit 14 may temporarily store information input via the input / output unit 16 or data or information used in calculations performed by the calculation unit 12 b described later. The input / output unit 16 includes a display unit 16a configured to display cutting conditions and calculation results. As shown in FIG2 , the display screen 20 of the display unit 16a includes an input area 21 and a result output area 22. Information corresponding to operations performed on the input unit 16b, such as a keyboard, is input into the input area 21. Furthermore, the input unit 16b may be integrally formed with the display unit 16a. The input area 21 includes a workpiece column 21a, a tool holder shape column 21b, a blade shape column 21c, a cutting condition column 21d, and a coolant condition column 21e. The workpiece column 21a displays various workpieces in a drop-down list. The workpiece to be cut can be selected from this list. The workpieces listed in the workpiece column 21a are obtained from workpiece-related information stored in the storage unit 14. Information indicating the workpiece selected via the input / output unit 16 is input to the receiving unit 12a, described later. In the tool holder shape column 21b, various tool holders are displayed in a drop-down list. The tool holder to be used can be selected from this list. Alternatively, the crosscutting blade angle and the blade tilt angle can be manually input. Information indicating the crosscutting blade angle and the blade tilt angle is input to the receiving unit 12a, described later. In the blade shape column 21c, various blades are displayed in a drop-down form. The blade to be used can be selected from this list. The blades listed in the blade shape column 21c are obtained from the information representing the tool stored in the storage unit 14. In addition, the tip radius and tip angle of the blade can also be specified. The information of the blade selected in the column 21c and the information of the tip radius and tip angle of the blade specified in the column 21c are input into the receiving unit 12a described later. The cutting condition section 21d includes an input box 21d1 for inputting cutting speed, feed speed, and depth of cut, and an adjustment box 21d2 arranged next to it. The feed speed is the feed rate per rotation, and the depth of cut is the radial depth of cut. Numerical values ​​for cutting speed, feed rate, and depth of cut are entered into input box 21d1. Regarding feed speed and depth of cut, the values ​​entered into input box 21d1 can be fine-tuned by moving the sliders displayed in adjustment bar 21d2. Furthermore, cutting speed is not used to calculate the tensile strain generated in the chips, which will be described later. Therefore, input box 21d1 for cutting speed can be omitted. Information related to feed speed and depth of cut entered into this box 21d is input into receiving unit 12a, which will be described later. In the coolant condition column 21e, whether to use coolant is input. In addition, this input information may not be used for the prediction of chip breakage. Therefore, the coolant condition column 21e can be omitted. The result output area 22 includes a contour map column 22a, a breakability column 22b, a break prediction column 22c, a fracture boundary column 22d, and a tool candidate column 22e. The contour map displayed in the contour map column 22a is a graph represented by a coordinate system with cutting conditions as the axes. The contour map shows the distribution of tensile strain generated in the chip using contour lines, and also indicates the chip fracture boundary 22f. In the contour diagram shown in Fig. 2 , the horizontal axis represents the feed rate and the vertical axis represents the amount of cut. Alternatively, the horizontal axis may represent the amount of cut and the vertical axis may represent the feed rate. In the contour map, the feed speed and the amount of cut-in represented by the information input in the input area 21 and received by the receiving unit 12a described later are located in the center of the contour map, and the range of the feed speed and the amount of cut-in displayed is set. In addition, the range of the feed speed and the amount of cut-in displayed includes at least a range that is predicted to be actually adjustable, and is determined in a manner that displays a range that does not become too large relative to the range. Therefore, it becomes a contour map that makes it easy to judge the adjustment amount when adjusting the feed speed or the amount of cut-in. These display controls are performed by the display control function contained in the control unit 12, and the control unit 12 provides the control information obtained by the display control function to the input and output unit 16 via the communication unit 12c. The contour map shows the following symbols ("+" symbols in FIG2 ) indicating the feed rate and depth of cut inputted in the input area 21 and received by the receiving unit 12a described later, and a broken line indicating the fracture boundary 22f. The fracture boundary 22f indicates the transition from the tensile strain generated in the chip to the fracture strain ε when the feed rate and depth of cut are changed. c Conditions. Furthermore, the contour plot shows contour lines of the ratio of tensile strain to fracture strain. Furthermore, the distribution of tensile strain is displayed by differentiating the magnitude of the ratio for each predetermined value using one or more methods selected from color, hue intensity, and brightness. Furthermore, differential values ​​may be used instead of ratios. In the breakability column 22b, a mark is displayed indicating whether the chip is predicted to break, whether it is predicted not to break, or an intermediate value based on information derived from the calculation unit 12b described later. This allows visual understanding of the breakability. In the column 22c of the predicted breaking value, the tensile strain ε at the feed rate and cutting depth input in the input area 21 and received by the receiving unit 12a described later is displayed as a numerical value. In addition, in the column 22d of the fracture boundary, the fracture strain ε is displayed as a numerical value. c value. In the tool candidate column 22e, a list of tools predicted to break chips based on information derived by the calculation unit 12b (described later) is displayed. Specifically, for the workpiece selected in the input area 21, the calculation unit 12b calculates whether chips break for all tools included in the information stored in the storage unit 14. Consequently, all tools are displayed in the tool candidate column 22e, with tools predicted to have a high chip breaking ability based on this calculation positioned at the top. In other words, the chip breaking ability of each tool is displayed at a glance. This display control is also performed by the display control function included in the control unit 12. The control unit 12 provides the control information obtained by the display control function to the input / output unit 16 via the communication unit 12c. As shown in FIG1 , the functions executed by the control unit 12 include a receiving unit 12a, a computing unit 12b, and a communication unit 12c. The receiving unit 12a receives information related to factors affecting whether the chips are broken, such as cutting conditions. Specifically, information related to the workpiece and tool selected in the input area 21 of the input / output unit 16 is input from the input / output unit 16 to the receiving unit 12a. In addition, information indicating the feed rate and the amount of cut entered in the input area 21 of the input / output unit 16 is input from the input / output unit 16 to the receiving unit 12a. That is, the receiving unit 12a receives information related to the workpiece to be cut and the tool used, selected from the workpiece information 14a stored in the storage unit 14 and indicated in the workpiece and tool information 14b, and receives information indicating the feed rate and the amount of cut entered in the input / output unit 16. The calculation unit 12 b uses the information received by the reception unit 12 a to derive information for predicting whether or not the chips can be broken. The communication unit 12c communicates with the input / output unit 16 to display the information for predicting whether or not the chip can be broken, derived by the calculation unit 12b, in a result output area 22 of a display screen 20 of a display unit 16a included in the input / output unit 16. The information for predicting whether or not the chip can be broken includes information displayed in a contour map column 22a, a mark displayed in a breakability column 22b, the tensile strain value displayed in a breakage prediction value column 22c, and the fracture strain value displayed in a fracture boundary column 22d. Here, the derivation of information for predicting whether or not chips can be broken by the calculation unit 12 b and the prediction and determination of whether or not chips can be broken will be described in detail. Whether the chip 30 ( FIG. 3 ) can be broken can be predicted by comparing the tensile strain ε generated in the chip 30 during cutting and the fracture strain ε of the material used in the cutting process. c Compare and determine to what extent the tensile strain ε is greater than the fracture strain ε c . The tensile strain ε generated in the chip 30 is calculated by the following formula (1). Here, h is the chip thickness, r 0 is the initial curling radius of the chip. That is, based on the initial curling radius r of the chip 30 0 and chip thickness h to calculate the tensile strain ε. [Number 1] …Formula (1) The tensile strain ε can also be replaced by the modified tensile strain ε' corrected by the following equations (2) and (3). Here, t is the cutting thickness, and b is the chamfer width or the tool tip radius. In other words, the tensile strain ε can also be corrected to the modified tensile strain ε' using a relationship expressing the ratio of the cutting thickness t to the chamfer width or the tool tip radius b. Since A has an upper limit of 1, when the cutting thickness t is greater than the chamfer width or the tool tip radius b, A = 1. [Number 2] …Formula (2) …Formula (3) In formula (2), the square of A is used, but the square of A or the cube of A may be used instead. As shown in Figure 3, the chamfer width b is the width of the chamfered flat surface at the edge of the blade tip. The blade tip radius b is the fillet radius of the blade tip edge. The chip thickness h is determined by the geometric relationship shown in Figure 4 and is therefore calculated using the following formula (4): where t is the chip thickness, Φ is the shear angle, and α is the rake angle. [Formula 3] …Formula (4) The cut thickness t is obtained geometrically based on the cutting conditions and tool posture. First, as shown in FIG6, when the cutting depth d is greater than the nose radius R (see FIG5), the cut thickness t is obtained by using the feed rate f and the cross-cutting knife angle θ and formula (5). In addition, when the value of a obtained by formula (6) using the cutting depth d and the nose radius R is negative, the cut thickness t becomes the same as the cutting depth d, so formula (7) is used. Furthermore, when the value of a obtained by formula (6) is negative, the case shown in FIG7 is obtained. In other cases, that is, when the cutting depth d is less than the nose radius R and the value of a obtained by formula (6) is positive, the cut thickness t is obtained by formula (8). Furthermore, when formula (8) is used, the case shown in FIG8 is obtained, and the cross-cutting knife angle θ becomes irrelevant, and the cut thickness t is determined by the nose radius R, the cutting depth d, and the feed rate f. [Formula 4] …Formula (5) …Equation (6) …Formula (7) …Equation (8) The rake angle α is obtained from the cross-sectional shape data of the insert in a predetermined direction stored in the storage unit 14. The rake angle α is not constant at any location on the rake face. Therefore, the rake angle α is used as the cross-sectional angle α along the chip 30 outflow direction θd (see FIG. 5 ). Therefore, the rake angle α along the cross-sectional area along this direction θd is derived by the calculation unit 12b and temporarily stored in the storage unit 14. The chip 30 outflow direction θd can be calculated using Colwell's approximation as the direction in which the chips 30 flow perpendicularly to a line connecting the two ends of the insert (the circumferential ends of the nose) that contact the workpiece. Specifically, given the depth of cut d, feed rate f, and insert nose radius R, the chip 30 outflow direction θd can be calculated based on these geometric relationships, as shown in Figure 5. The storage unit 14 stores the rake angle α1 of a cross-section in the direction θ1 perpendicular to the crosscut blade, and the rake angle α2 of a cross-section in the direction θ2 bisector of the blade's tip angle. Therefore, the calculation unit 12b uses these rake angles α1 and α2 to interpolate or extrapolate to determine the rake angle α in the outflow direction θd corresponding to the cutting conditions (see FIG. 9 ). In FIG. 9 , θ2 on the horizontal axis corresponds to the direction bisector of the blade's tip angle, and θ1 corresponds to the direction perpendicular to the crosscut blade. In addition, the chip breaker shape is also derived in the same way. That is, the storage unit 14 stores data representing the chip breaker shape in a specified direction. The so-called specified direction is the direction θ1 perpendicular to the cross-cutting knife and the direction θ2 bisecting the tip angle of the blade. Moreover, the calculation unit 12b calculates the chip breaker shape β1 and the chip breaker shape β2 (or the chip initial curling radius r) in the two directions θ1 and θ2 stored in the storage unit 14. 0) data, and calculate the chip breaker shape β (or the chip initial curling radius r) in the chip outflow direction θd corresponding to the cutting conditions by interpolation or extrapolation. 0). As shown in Figure 10, the rake angles α1 and α2 are calculated by taking the slope of the rake face 27 of the insert in a cross section in the corresponding direction and the distance from the cutting edge (i.e., the intercept value with the cutting edge as the origin). Furthermore, the chip breaker shapes β1 and β2 are calculated by taking the slope of the chip breaker bevel 28 of the insert in a cross section in the corresponding direction and the slope of the chip breaker bevel 28 of the insert in a cross section in the corresponding direction and the slope of the chip breaker bevel 28 of the insert. The shear angle Φ is obtained by performing cutting tests and is stored in the storage unit 14. An example of the cutting speed, cut thickness t, and rake angle α used in the cutting tests is shown in Table 1. The storage unit 14 also stores information indicating the shear angle Φ, including data on the shear angle Φ obtained from cutting tests performed under other conditions. [Table 1] The thickness of the chips 30 obtained in the cutting test was measured. The shear angle Φ was calculated by substituting the measured chip thickness into the chip thickness h in equation (4). Table 2 shows an example of the chip thickness and calculated shear angle obtained in the cutting test of S45C as the workpiece. [Table 2] Initial curling radius r of chip 30 The calculation method of 0 differs depending on whether the insert conforms to the parallel type or the clamping type shown in Figures 11A and 11B. In the parallel type shown in Figure 11A, since the chip breaker groove slope 28 is small, the chip 30 contacts the portion of the cutting edge 32 in the rake face 27 and the apex 29 of the chip breaker groove. Therefore, the initial curling radius r 0 is geometrically calculated as the radius of the arc that connects the cutting edge 32 and the vertex 29 of the chip breaker. On the other hand, in the clamping type shown in FIG11B , the chip 30 connects with the portion of the cutting edge 32 in the rake face 27 and the chip breaker slope 28. Therefore, the initial curling radius r 0 is geometrically calculated as the radius of the arc connecting the cutting edge 32 and the chip breaker slope 28. When determining whether it is a parallel type or a clamping type, the chip breaker shape derived by the calculation unit 12b is used. In addition, as the initial curling radius, the initial curling radius r in the chip outflow direction θd according to the cutting conditions is used in the same manner as the rake angle α. 0. That is, the storage unit 14 stores the initial curling radius r1 (see FIG9 ) in the cross section in the direction θ1 perpendicular to the cross-cutting blade and the initial curling radius r2 (see FIG9 ) in the cross section in the direction θ2 along the bisector of the blade's tip angle. The calculation unit 12b uses these initial curling radii r1 and r2 to interpolate or extrapolate to determine the initial curling radius r in the outflow direction θd corresponding to the cutting process conditions. 0. As mentioned above, the tensile strain ε is derived from the formula (1). On the other hand, the chip fracture strain ε c , can be obtained by cutting tests performed by changing the conditions little by little. In the storage unit 14, the fracture strain ε obtained by the cutting test for each workpiece is stored. c That is, the fracture strain ε obtained by cutting tests after changing cutting conditions (cutting depth d and feed speed f) c The value of is stored in the storage unit 14 in association with the workpiece. Figure 12 shows an example of determining whether a chip 30 is broken. This example shows the results when using S45C as the workpiece. A chip 30 that is not broken is marked as "×." A chip 30 that is partially broken but has a continuous loop of 10 or more is marked as "△." A chip that is broken within 10 loops is marked as "○." The tensile strain ε of the chip 30 calculated in each cutting test was determined to be the smallest value when the chip 30 was broken (set as "○"), and was defined as the chip breaking strain ε. c Chip fracture strain ε for each workpiece c The value of is stored in the storage unit 14 in association with the name of the workpiece. As mentioned above, the tensile strain ε is calculated according to formula (1) and compared with the fracture strain ε c As shown in FIG13 , when the chip thickness h is greater than the distance L from the tool tip 32 to the chip breaker apex 29, that is, ...When the equation (9) holds, the calculation unit 12b outputs information indicating that the chip 30 is predicted not to break. c The comparative prediction of the breakability of the chip breaker is made as follows: the smaller the distance L from the tool tip 32 to the vertex 29 of the chip breaker groove, the easier it is to break. However, in reality, if the chip breaker groove is too small, as shown in Figure 13, the chip 30 will not bend due to the chip breaker groove, but will pass through the chip breaker groove, and the chip 30 will not break. In order to improve the breakability prediction when this phenomenon occurs, the breakability prediction when equation (9) is established is also added. Next, a method of predicting the breakability of the chips 30 using the chip breakability prediction device 10 according to the first embodiment will be described with reference to FIG. 14 . When cutting a workpiece, cutting conditions must be set. To set these conditions, a chip breakability prediction device 10 is used. The user inputs the necessary information into the input / output unit 16, which then outputs a chip breakability prediction result. The user then determines the cutting conditions based on the prediction result. First, the user selects the target workpiece in the workpiece field 21a of the input area 21 in the input unit 16, and selects the tool holder and blade to be used in the tool holder shape field 21b and the blade shape field 21c (step ST11). This extracts information related to the selected workpiece and tool from the workpiece and tool information stored in the storage unit 14 and inputs it to the receiving unit 12a. If the user enters values ​​for the crosscutting blade angle, blade inclination angle, blade nose radius R, and tip angle, this information is also input to the receiving unit 12a. The user then enters the cutting speed, feed rate f, and depth of cut d in the cutting condition field 21d (step ST12). This information is also input to the receiving unit 12a. The cutting condition values ​​are provisional. If it is predicted that the chips 30 will not break, the cutting conditions are re-entered. Furthermore, the tool holder and insert can be modified based on the prediction results. When the information required for the cutting process is input to the receiving unit 12a, the computing unit 12b uses the information received by the receiving unit 12a to derive information for predicting whether the chip 30 can be broken. Specifically, the computing unit 12b first calculates the cut thickness t based on the relationship between the cutting depth d and the tool nose radius R using any of equations (5), (7), and (8) (step ST13). The calculation unit 12b also calculates the chip outflow direction θd using the cutting depth d, the feed speed f, and the nose radius R of the insert (step ST14). The chip outflow direction θd is calculated using, for example, the Colwell approximation stored in the storage unit 14. The calculation unit 12b uses the calculated chip outflow direction θd, the rake angle α1, the rake angle α2, and the initial curling radius r1, the initial curling radius r2 of the chip stored in the storage unit 14, to calculate the rake angle α in the direction θd and the initial curling radius r1 of the chip. 0 (step ST15, step ST16). Then, the calculation unit 12b calculates the chip thickness h by substituting the cutting thickness t obtained in step ST13, the rake angle α obtained in step ST15, and the shear angle Φ stored in the storage unit 14 into equation (4) (step ST17). In addition, the calculation unit 12b calculates the chip thickness h by substituting the initial curling radius r obtained in step ST16 into the initial curling radius r obtained in step ST16. 0 and the chip thickness h obtained in step ST17 are substituted into formula (1) to derive the tensile strain ε (step ST18). At this time, if it is determined that the chamfer width or the corner radius b of the selected insert is relatively large relative to the cut thickness t, the corrected tensile strain ε′ calculated by equation (2) is used instead as the tensile strain ε in equation (1) (step ST19 ). The derived tensile strain ε (or modified tensile strain ε′) is displayed in the column 22c of the predicted breaking value in the result output area 22 of the input / output unit 16. c The value of is displayed in the fracture boundary column 22 d in the result output area 22 of the input / output unit 16 (step ST20 ). Then, the calculation unit 12b compares the tensile strain ε (or the modified tensile strain ε′) derived in step ST18 with the fracture strain ε stored in the storage unit 14. c The comparison is performed to determine the breaking properties of the chips 30 (step ST21 ). The communication unit 12c communicates with the input / output unit 16. c The comparison result is displayed in the breakability column 22b of the result output area 22 of the input / output unit 16, and a mark indicating the breakability such as ○△× is displayed (step ST22). For example, when the value of the tensile strain ε (or the modified tensile strain ε') is c If the value is larger than a predetermined value or more, "○" is displayed. That is, in this case, the result indicating that chip breakage is predicted is displayed. Furthermore, the calculation unit 12b similarly derives the tensile strain ε (or modified tensile strain ε') not only for the selected depth of cut d and feed rate f, but also for depth of cut d and feed rate f within a specified range that includes these values. Specifically, the calculation unit 12b derives information for predicting whether or not chips can be broken in each case when the cutting conditions are changed within the range of feed rate and depth of cut displayed on the contour map. Furthermore, the calculation unit 12b extracts the fracture strain ε for the depth of cut d and feed rate f within this range. c . The communication unit 12c then outputs information for creating a contour map of the tensile strain ε (or modified tensile strain ε') for the specified range of the cutting depth d and feed speed f. Furthermore, the communication unit 12c communicates with the input / output unit 16 to output information for displaying the contour map image on the display screen 20 of the display unit 16a in the input / output unit 16 (step ST23). The contour map is then displayed on the display screen 20 of the display unit 16a. The contour map image also displays the fracture strain ε for each cutting depth d and feed speed f. cThat is, the communication unit 12c communicates with the input / output unit 16 based on the information derived by the calculation unit 12b. As a result, the display unit 16a of the input / output unit 16 displays an image that represents the distribution of tensile strain ε generated in the chip using contour lines in a coordinate system with cutting conditions as coordinate axes, and also shows the fracture boundary 22f of the chip. Furthermore, the calculation unit 12b compares the tensile strain ε (or the modified tensile strain ε′) with the fracture strain ε for all tools included in the tool information 14b stored in the storage unit 14 for the selected workpiece. c In this way, whether the chips 30 are likely to break is calculated for each tool. As a result, all registered tools are listed in the tool candidate column 22e in the order of the tools determined to be likely to break (step ST24). If it is determined that the chip 30 will break under the input cutting conditions, the user can simply proceed with cutting the workpiece under the input cutting conditions. On the other hand, if it is determined that the chip 30 will not break under the input cutting conditions, the user can simply refer to the displayed contour map and change the cutting conditions to those predicted to break. Alternatively, the user can change the cutting conditions and use the chip breakability prediction device 10 again to predict the chip breakability. Alternatively, the user can change to a tool displayed in the tool selection list and proceed with cutting the workpiece. Next, an example of the prediction result of the disconnection property obtained by the cutting test after changing the cutting depth d and the feed speed f is introduced. FIG15 is a figure showing the symbols (○△×) representing the disconnection state of the chip shown in FIG12 in the contour map obtained by the chip disconnection property prediction device 10. Thus, the prediction result is roughly consistent with the experimental result. Furthermore, as the cutting depth decreases from the cutting depth of 1.2 mm, the part judged to be disconnected is smoothly bent. The reason is that at the cutting depth d below the tool nose radius R (1.2 mm), the chip outflow angle changes sharply. However, it is known that due to the use of the chip breaker groove shape in the chip outflow direction θd (initial curling radius r 0) and the rake angle α method, so the chip breaking performance can be predicted. Figures 16A to 16C show the prediction results when the tensile strain ε is replaced by the modified tensile strain ε'. When the chamfer width b is relatively large, the prediction results related to whether or not the cut is possible are biased. However, it is found that by replacing the tensile strain ε with the modified tensile strain ε', the prediction accuracy is improved. In addition, it is found that using A 2 The correction value is better than using A or A 3 The prediction accuracy is improved in the case of the correction value. FIG17 also shows the prediction results when the tensile strain ε is replaced by the modified tensile strain ε'. FIG17 shows an actual chip photograph, a contour map based on the tensile strain ε, and a contour map based on the modified tensile strain ε'. For example, in Test Example No. 4, where the chip 30 did not break, the breakability prediction based on the tensile strain ε predicted that the chip would break, while the prediction based on the modified tensile strain ε' predicted that the chip would not break. Therefore, it is clear that replacing the tensile strain ε with the modified tensile strain ε' improves prediction accuracy. Figure 18 shows an example of the result when the calculation unit 12b outputs information indicating that the chip 30 is predicted to not break when the chip thickness h is greater than the distance L from the tool tip 32 to the apex 29 of the chip breaker. The upper right portion of the figure represents the area where the chip 30 will not break. On the other hand, the ○△× obtained based on the experimental results are displayed as △ within this area. Therefore, it can be said that the chip 30 is predicted to be too thick and will not break. Figure 19 also shows an example of the results when the chip thickness h is greater than the distance L from the tool tip 32 to the chip breaker apex 29. This example shows the results after changing the tool, and a chip photograph is also shown. It can be seen that the chip photograph is consistent with the predicted results. As described above, in the chip breakability prediction device 10 of this embodiment, the receiving unit 12a receives information related to the workpiece and the tool, as well as information indicating the feed rate and the amount of cut. Then, the calculation unit 12b derives information for predicting whether the chip 30 can break when the workpiece, tool, feed rate f and amount of cut d indicated by the information received by the receiving unit 12a are used. The derived information is displayed on the display unit 16a. Therefore, the tester can judge whether the chip 30 is broken based on the information displayed on the display unit 16a. In addition, even if it is predicted that the chip 30 will not break, by changing at least one of the feed rate f and the amount of cut d, information related to the break prediction can be obtained again. Therefore, the condition setting when performing the cutting process can be easily performed. Furthermore, in this embodiment, when the tool's chamfer width or tool nose radius b is relatively large relative to the cut thickness t, the tensile strain ε is replaced by a modified tensile strain ε'. This means that the influence of the tool's chamfer width or tool nose radius b on the tensile strain ε of the chip 30 is taken into account. This further improves the predictability of chip 30 breakage. Furthermore, in this embodiment, the result output area 22 of the display unit 16a displays a contour map, a determination of feasibility, predicted disconnection values, and a fracture boundary 22f, but this is not limiting. The display unit 16a may display only the contour map, only the determination of feasibility, or only the predicted disconnection values ​​and the fracture boundary 22f. Furthermore, the display of tool candidates may be omitted. In this embodiment, the tensile strain ε is replaced by the corrected tensile strain ε′. However, this process may be omitted if it is known that the cut thickness t is smaller than the chamfer width or the tool nose radius b. In addition, in this embodiment, the calculation unit 12b calculates the initial curling radius r in the chip outflow direction θd by the cutting process. 0 and the front angle α, and use the calculated initial curling radius r 0 and the rake angle α are used to perform the calculation for predicting the breaking property. However, this is not limited to this. That is, although the prediction accuracy is reduced, the initial curling radius r in the chip outflow direction θd may not be derived. 0 and rake angle α. In this case, for example, the initial curling radius r in the direction θ1 perpendicular to the cross-cutting knife can also be used. 0 and the front angle α, or the initial curling radius r in the direction θ2 along the bisector of the tip angle of the blade can also be used 0 and the rake angle α. (Second Embodiment) As shown in FIG20 , the second embodiment is a control device 41 provided in a prediction system 40 for predicting chip breakability during cutting. Components identical to those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted. The control device 41 is communicably connected to the input / output device 42 via, for example, a computer network NW. The control device 41 includes a control unit 12 for performing arithmetic processing, and a storage unit 14 for storing processing programs, data, and the like. The input / output device 42 includes a display unit 16a having a display screen 20 and an input unit 16b, such as a keyboard. The display unit 16a is configured to display cutting conditions or calculation results. Similar to the display screen 20 of the first embodiment (see FIG. 2 ), the display screen 20 of the display unit 16a includes an input area 21 and a result output area 22. Information inputted through operations on the input unit 16b is displayed in the input area 21. This inputted information is temporarily stored in the storage unit 14 of the control device 41, for example, via a computer network NW. Furthermore, the input unit 16b may be integrally formed with the display unit 16a. The storage unit 14 stores information related to the workpiece being cut (workpiece information 14a) and information related to the tool (tool information 14b). The storage unit 14 may also temporarily store information sent from the input / output device 42 or data or information used in calculations performed by the calculation unit 12b. The functions executed by the control unit 12 include a receiving unit 12a, a computing unit 12b, and a communication unit 12c. The communication unit 12c sends necessary control information to the input / output device 42 so that the workpiece and tool represented by the information stored in the storage unit 14 are displayed on the display screen 20 of the input / output device 42. When performing calculations, the control unit 12 uses information stored in the storage unit 14 and information output from the input / output device 42 and temporarily stored in the storage unit 14 via the computer network NW. The receiving unit 12a receives information related to factors that affect whether or not chips break, such as cutting conditions, from the input / output device 42. Specifically, information related to the workpiece and tool that match the workpiece and tool selected in the input area 21 of the input / output device 42 is input from the storage unit 14 to the receiving unit 12a. Furthermore, information indicating the feed rate f and the amount of cut d entered in the input area 21 of the input / output device 42 is input from the input / output device 42 to the receiving unit 12a. Specifically, the receiving unit 12a receives information related to the workpiece and tool selected in the input / output device 42 as the target of cutting, among the workpiece and tool indicated by the information stored in the storage unit 14, and also receives information indicating the feed rate f and the amount of cut d used in the cutting process. The calculation unit 12 b uses the information received by the reception unit 12 a to derive information for predicting whether or not the chips can be broken. The communication unit 12 c communicates with the input / output device 42 to display the information for predicting whether or not the chips can be broken, derived by the calculation unit 12 b , in the result output area 22 of the display screen 20 of the display unit 16 a of the input / output device 42 . The control device 41 of the second embodiment performs steps ST13 to ST19 and ST21 of the control procedure shown in Fig. 14. The control device 41 also communicates with the input / output device 42 to perform steps ST20 and ST22 to ST24 in the input / output device 42. Regarding other structures, functions, and effects, description thereof will be omitted, and the description of the first embodiment can be applied to the second embodiment. (Other Embodiments) The embodiments disclosed herein are illustrative in all respects and should not be construed as limiting. The present invention is not limited to the embodiments described above, and various modifications and improvements can be made without departing from the spirit and scope of the invention. Here, the above-mentioned embodiment will be summarized. (1) The chip breakability prediction device of the embodiment includes: a storage unit storing information related to a workpiece and a tool in a cutting process; a receiving unit configured to receive information related to a workpiece to be cut and a tool used, selected from the workpiece and tool indicated in the information stored in the storage unit, and to receive information indicating a feed rate and a cutting depth in the cutting process; a calculation unit configured to derive information for predicting whether a chip can be broken using the information received by the receiving unit; and a display unit configured to display the information for predicting whether the chip can be broken derived by the calculation unit. In the chip breakability prediction device, a receiving unit receives information related to the workpiece to be cut and the tool used, as well as information indicating the feed rate and the amount of cut. A computing unit then derives information used to predict whether the chip will break when the workpiece, tool, feed rate, and amount of cut indicated by the information received by the receiving unit are used. This derived information is displayed on a display unit, so it is possible to determine whether the chip will break based on the information displayed on the display unit. Furthermore, even if it is predicted that the chip will not break, information related to the breakage prediction can be obtained again by changing at least one of the feed rate and the amount of cut. This makes it easy to set the conditions for performing the cutting process. (2) The calculation unit may also be configured to calculate the tensile strain generated in the chips formed by the cutting process based on the initial curling radius and chip thickness of the chips, and to correct the tensile strain using the chamfer width or tool tip radius of the tool represented by the information received by the receiving unit, and the cutting thickness obtained based on the tool nose radius, the tool cross-cutting angle, the feed speed, and the cutting depth represented by the information received by the receiving unit. In this aspect, since the influence of the tool chamfer width or tool nose radius and the cutting thickness on the tensile strain of the chip is taken into consideration, the chip breakage predictability can be further improved. Specifically, when a chamfer or tool radius is larger than the cut thickness determined by the cutting conditions, the chip shape is determined by the chamfer or tool radius, regardless of the chip breaker being used. Consequently, contrary to the original assumption (where the chip breaker geometrically determines the initial chip curl radius), the accuracy of predicting whether the chip will break can be reduced. In contrast, in this embodiment, the correction for tensile strain avoids this reduction in prediction accuracy. (3) The calculation unit may also be configured to obtain an initial curling radius and a rake angle in each section of the tool in a direction perpendicular to the cross-cutting blade and a section at a bisector of the top angle of the tool represented by the information received by the receiving unit, and to calculate an initial curling radius and a rake angle in a chip outflow direction based on the cutting process by interpolation or extrapolation based on the initial curling radius and the rake angle in each section obtained. In this aspect, since the initial curling radius and the rake angle are used in consideration of the chip outflow direction, the chip breakage predictability can be further improved. That is, even when the same tool is used, the chip outflow direction will change due to different cutting conditions or the material being cut. Therefore, since the cross-section of the tool in the chip outflow direction changes, the cross-sectional shape of the chip breaker that affects the breaking property of the chips changes. Therefore, it is actually necessary to grasp the tool shape in three dimensions. In this case, it is necessary to store three-dimensional (3D) data and process the data for each condition of the cutting process, which requires a complex program. In contrast, in this embodiment, the initial curling radius and rake angle in the chip outflow direction based on the cutting process are calculated by interpolation or extrapolation based on the initial curling radius and rake angle in each cross-section obtained. Therefore, a complex program is not required. In addition, the analysis time for each condition will not be as long as the method using FEM analysis. (4) The display unit may also be configured to display an image that represents the distribution of tensile strain generated in the chips by contour lines in a coordinate system having the cutting conditions as coordinate axes and shows the fracture boundaries of the chips as the information for predicting the breakability of the chips. In this aspect, when the information derived from the calculation unit predicts that the chips will not break, the cutting conditions for chip breaking can be easily estimated by using the image displayed on the display unit as a reference. (5) The display unit may be configured to display the distribution of tensile strain generated in the chips using one or more methods selected from the group consisting of color, hue depth, and brightness. In this aspect, the distribution of tensile strain can be easily recognized in the image displayed on the display unit. (6) The calculation unit may be configured to compare the distance from the cutting edge of the tool to the top of the chip breaker groove with the chip thickness, and predict that the chip will not break if the chip thickness is large. When the chip thickness is large relative to the shape of the chip breaker, the chip rigidity is too high, and the chip will not enter the valley of the chip breaker. As a result, the generated chips will not follow the assumed shape of the chip breaker, and the prediction accuracy of the breakability may be reduced. In contrast, in this aspect, the breakability is predicted by comparing the distance from the cutting tool tip to the chip breaker vertex with the chip thickness during cutting. This prevents the prediction accuracy from being reduced. (7) The calculation unit may be configured to calculate the chip breaking properties of all tools indicated by the information stored in the storage unit. Furthermore, the display unit may be configured to display a list of the chip breaking properties of each tool based on the information derived by the calculation unit. In this aspect, the chip breaking performance of each tool is displayed at a glance on the display. Therefore, even if the information derived by the calculation unit predicts that the chips will not break, tools that are expected to be improved can be identified based on the overview of tool breaking performance displayed on the display. Consequently, improvements in chip breaking performance can be expected. (8) The control device of the embodiment is provided in a prediction system for predicting the breakability of chips in cutting processing, and is connected to an input-output device in a communicative manner, and the control device includes: a storage unit storing information related to a workpiece and a tool in cutting processing; a receiving unit configured to receive information related to the workpiece and the tool selected as the object of cutting processing and the tool used in the input-output device from the workpiece and the tool shown in the information stored in the storage unit, and to receive information indicating the feed speed and the amount of cutting in the cutting processing from the input-output device; a calculation unit configured to use the information received by the receiving unit to derive information for predicting whether the chips can be broken; and a communication unit configured to communicate with the input-output device to display the information for predicting whether the chips can be broken derived by the calculation unit on a display unit of the input-output device. In the control device, a receiving unit receives information related to the workpiece to be cut and the tool used, as well as information indicating the feed rate and the amount of cut. Then, the calculation unit derives information for predicting whether the chips can be broken when the workpiece, tool, feed rate and amount of cut indicated by the information received by the receiving unit are used. The derived information is output from the communication unit and input into the input / output device. Based on the information displayed on the display unit of the input / output device, it is possible to determine whether the chips are broken. In addition, even if it is predicted that the chips will not break, by changing at least one of the feed rate and the amount of cut, information related to the prediction of the break can be obtained again. Therefore, the setting of the conditions for implementing the cutting process can be easily performed. (9) The calculation unit may also be configured to calculate the tensile strain generated in the chips formed by the cutting process based on the initial curling radius and chip thickness of the chips, and to correct the tensile strain using the chamfer width or tool tip radius of the tool represented by the information received by the receiving unit, and the cutting thickness obtained based on the tool nose radius, the cross-cutting angle of the tool, the feed speed, and the cutting depth represented by the information received by the receiving unit. (10) The calculation unit may also be configured to obtain an initial curling radius and a rake angle in each section of the tool in a direction perpendicular to the cross-cutting blade and a section at a bisector of the top angle of the tool represented by the information received by the receiving unit, and to calculate an initial curling radius and a rake angle in a chip outflow direction based on the cutting process by interpolation or extrapolation based on the initial curling radius and the rake angle in each section obtained. (11) The communication unit may also be configured to communicate with the input / output device so as to display an image on the display unit, which represents the distribution of tensile strain generated in the chips by contour lines in a coordinate system having the cutting conditions as coordinate axes and shows the fracture boundaries of the chips. (12) The communication unit may be configured to communicate with the input / output device so as to display the distribution of tensile strain generated in the chips on the display unit using at least one method selected from the group consisting of color, hue depth, and brightness. (13) The calculation unit may be configured to compare the distance from the cutting edge of the tool to the top of the chip breaker groove with the chip thickness, and predict that the chip will not break if the chip thickness is large. When the chip thickness is large relative to the shape of the chip breaker, the chip rigidity is too high, and the chip will not enter the valley of the chip breaker. As a result, the generated chips will not follow the assumed shape of the chip breaker, and the prediction accuracy of the breakability may be reduced. In contrast, in this aspect, the breakability is predicted by comparing the distance from the cutting tool tip to the chip breaker vertex with the chip thickness during cutting, thus preventing a decrease in prediction accuracy. (14) The calculation unit may be configured to calculate the chip breaking properties of all tools represented by the information stored in the storage unit. In addition, the communication unit may communicate with the input / output device to display a list of the chip breaking properties of each tool on the display unit based on the calculation results obtained by the calculation unit. (15) In the chip breaking property prediction method of the embodiment, a receiving unit receives information related to the workpiece and tool in the cutting process selected from the information stored in the storage unit, and the workpiece to be cut and the tool used are received by the receiving unit, and information indicating the feed speed and cutting amount in the cutting process is received by the receiving unit. Using the information received by the receiving unit, the calculation unit derives information for predicting whether the chip can be broken, and the information derived by the calculation unit is displayed on the display unit. In the chip breakability prediction method, a receiving unit receives information related to the workpiece and tool, as well as information indicating the feed rate and the amount of cut. A computing unit uses the information received by the receiving unit to derive information for predicting whether the chip will break. This derived information is displayed on a display unit. Therefore, it is possible to determine whether the chip will break based on the information displayed on the display unit. Furthermore, even if it is predicted that the chip will not break, information related to the breakage prediction can be obtained again by changing at least one of the feed rate and the amount of cut. This makes it easy to set the conditions for performing the cutting process. (16) In the chip breaking property prediction method, the calculation unit may calculate the tensile strain generated in the chips formed by the cutting process based on the initial curling radius and chip thickness of the chips. In this case, the calculation unit may correct the tensile strain using the chamfer width or tool nose radius of the tool indicated by the information received by the receiving unit, and the cut thickness obtained based on the tool nose radius, the tool crosscut angle, the feed rate, and the cutting depth indicated by the information received by the receiving unit. (17) In the chip breaking property prediction method, the initial curling radius and rake angle in each section can be obtained by the calculation unit based on the section of the tool in the direction perpendicular to the cross-cutting cutter and the section at the bisector of the top angle of the tool represented by the information received by the receiving unit, and the initial curling radius and rake angle in the chip outflow direction based on the cutting process can be calculated by the calculation unit through interpolation or extrapolation based on the initial curling radius and rake angle in each section obtained. (18) In the chip breaking property prediction method, the calculation unit may compare the distance from the cutting edge of the cutting tool to the top of the chip breaker groove with the chip thickness, and predict that the chip will not break if the chip thickness is large. When the chip thickness is large relative to the shape of the chip breaker, the chip rigidity is too high, and the chip will not enter the valley of the chip breaker. As a result, the generated chips will not follow the assumed shape of the chip breaker, and the prediction accuracy of the breakability may be reduced. In contrast, in this aspect, the breakability is predicted by comparing the distance from the cutting tool tip to the chip breaker vertex with the chip thickness during cutting, thus preventing a decrease in prediction accuracy. (19) In the chip breaking property prediction method of the embodiment, information related to the workpiece and tool in the cutting process selected from the information stored in the storage unit, the workpiece to be cut and the tool used in the cutting process are received from the input-output device, and information representing the feed speed and the amount of cut in the cutting process are received from the input-output device. The operation unit derives information for predicting whether the chip can be broken when the workpiece, tool, feed speed and amount of cut are represented by the information received from the input-output device. The communication unit communicates with the input-output device to display the information derived by the operation unit on the display unit of the input-output device. In the chip breakability prediction method, information representing the workpiece, tool, feed rate, and depth of cut is collected, and information is derived to predict whether the chip will break given the workpiece, tool, feed rate, and depth of cut indicated by this information. This derived information is displayed on a display unit via communication with an input / output device. Based on this displayed information, it is possible to determine whether the chip will break. Furthermore, even if it is predicted that the chip will not break, information related to the breakage prediction can be obtained again by changing at least one of the feed rate and depth of cut. This makes it easy to set the conditions for performing the cutting process. As described above, according to the embodiment, when performing cutting, the cutting conditions can be easily set. This application is based on Japanese Patent Application No. 2023-198389 filed with the Japan Patent Office on November 22, 2023, the contents of which are incorporated into this application by reference. 10: Chip breaking prediction device 12: Control unit 12a: Receiving unit 12b: Calculation unit 12c: Communication unit 14: Storage unit 14a: Workpiece information 14b: Tool information 16: Input / output unit 16a: Display unit 16b: Input unit 20: Display screen 21: Input area 21a: Workpiece column 21b: Tool holder shape column 21c: Blade shape column / column 21d: Cutting condition column / column 21d1: Input box 21d2: Adjustment column 21e: Coolant condition column 22: Results Output area 22a: Contour map column 22b: Disconnection column 22c: Disconnection prediction value column 22d: Fracture boundary column 22e: Tool candidate column 22f: Fracture boundary 27: Front cutting edge 28: Chip breaker groove slope 29: Chip breaker groove vertex / chip breaker groove vertex 30: Chip 32: Tool tip 40: Prediction system 41: Control device 42: Input and output device b: Chamfer width / Tool tip radius d: Cutting depth f: Feed speed h: Chip thickness L: Distance NW: Computer network R: Tool nose radius r 0: Initial chip curling radius / initial curling radius r1, r2: Initial curling radius ST11, ST12, ST13, ST14, ST15, ST16, ST17, ST18, ST19, ST20, ST21, ST22, ST23, ST24: Step t: Cutting thickness V: Cutting speed α, α1, α2: Rake angle β, β1, β2: Chip breaker shape ε: Tensile strain ε': Corrected tensile strain ε c : Fracture strain θ: Crosscutting knife angles θ1, θ2: Direction θd: Chip outflow direction / outflow direction / direction Φ: Shear angle FIG1 is a diagram schematically showing a chip breaking property prediction device of a first embodiment. FIG2 is a diagram showing an example of a display screen provided on a display unit of an input / output unit included in the chip breaking property prediction device. FIG3 is a diagram for illustrating the chamfer width b. FIG4 is a diagram for illustrating the chip thickness h. FIG5 is a diagram for illustrating the chip outflow direction θd. FIG6 is a diagram for illustrating the cutting thickness t when the cutting amount d is greater than the blade nose radius R. FIG7 is a diagram for illustrating the cutting thickness t when a obtained by formula (6) is negative. FIG8 is a diagram for illustrating the cutting thickness t when formula (8) is used. FIG9 is a diagram for illustrating the rake angle α and the chip breaker groove shape β (the chip initial curling radius r in the chip outflow direction θd). 0) is a diagram for explaining the calculation method of the rake face and the chip breaker groove slope. FIG11A is a diagram for explaining the parallel type insert. FIG11B is a diagram for explaining the clamping type insert. FIG12 is a diagram for explaining the fracture strain ε of the chip c FIG13 is a diagram showing a case where the chip thickness h is greater than the distance L from the tool tip to the apex of the chip breaker. FIG14 is a diagram for explaining a method for predicting the breakability of chips. FIG15 is a diagram showing an example of a prediction result obtained by a chip breakability prediction device. FIG16A is a diagram showing an example of a prediction result when tensile strain is replaced by modified tensile strain. FIG16B is a diagram showing an example of a prediction result when tensile strain is replaced by modified tensile strain. FIG16C is a diagram showing an example of a prediction result when tensile strain is replaced by modified tensile strain. FIG17 is a diagram showing an example of a prediction result when tensile strain is replaced by modified tensile strain. FIG18 is a diagram showing an example of a prediction result when the chip thickness h is greater than the distance L from the tool tip to the apex of the chip breaker. FIG19 is a diagram showing an example of a prediction result when the chip thickness h is greater than the distance L from the tool tip to the apex of the chip breaker. FIG20 is a diagram schematically showing a prediction system including a control device of the second embodiment. 10: Chip breaking prediction device 12: Control Department 12a: Receiving unit 12b: Operation unit 12c: Communications Department 14: Storage 14a: Cutting material information 14b: Tool Information 16: Input and output unit 16a: Display unit 16b: Input section

Claims

1. A chip breakage prediction device, comprising: a storage unit storing information related to a workpiece and a tool in a cutting process; A receiving unit is configured to receive information related to a workpiece and a tool to be cut and used in the cutting process, selected from the workpiece and the tool indicated in the information stored in the storage unit, and receive information indicating a feed rate and a cutting depth in the cutting process; a calculation unit is configured to derive information for predicting whether the chips can be broken using the information received by the receiving unit; and a display unit is configured to display the information derived by the calculation unit for predicting whether the chips can be broken.

2. A chip breakage prediction device as described in claim 1, wherein the calculation unit is configured to calculate the tensile strain generated in the chips formed by the cutting process based on the initial curling radius and chip thickness of the chips, and is configured to correct the tensile strain using the chamfer width or tool tip radius of the tool represented by the information received by the receiving unit, and the cutting thickness obtained based on the tool nose radius, the tool cross-cutting angle, the feed speed and the cutting depth represented by the information received by the receiving unit.

3. A chip breakage prediction device as described in claim 1, wherein the calculation unit is configured to obtain the initial curling radius and rake angle in each section based on the section of the tool in the direction perpendicular to the cross-cutting cutter and the section at the bisector of the top angle of the tool represented by the information received by the receiving unit, and is configured to calculate the initial curling radius and rake angle in the chip outflow direction based on the cutting process by interpolation or extrapolation based on the initial curling radius and the rake angle in each section obtained.

4. A chip breakability prediction device as described in claim 1, wherein the display unit is configured to display the following image, which is an image that represents the distribution of tensile strain generated in the chip by contour lines in a coordinate system with the cutting conditions as coordinate axes and shows the fracture boundary of the chip, as the information for predicting the breakability of the chip.

5. The chip breaking performance prediction device according to claim 4, wherein the display unit is configured to display the distribution of tensile strain generated in the chips by one or more methods selected from color, hue depth, and brightness.

6. The chip breaking property prediction device according to claim 1 , wherein the calculation unit is configured to compare the distance from the tool tip to the chip breaker groove vertex with the chip thickness, and predict that the chip will not break if the chip thickness is large.

7. The chip breaking performance prediction device according to claim 1, wherein the calculation unit is configured to calculate the chip breaking performance of all tools represented by the information stored in the storage unit, and the display unit is configured to display the chip breaking performance of each tool at a glance based on the information derived by the calculation unit.

8. A control device is provided in a prediction system for predicting chip breakage in cutting processing, and is communicatively connected to an input / output device, the control device comprising: a storage unit storing information related to a workpiece and a tool in a cutting process; A receiving unit is configured to receive, from the input-output device, information related to the workpiece and tool selected as the object of cutting processing and the tool used in the input-output device, among the workpiece and tool shown in the information stored in the storage unit, and to receive, from the input-output device, information indicating the feed speed and cutting amount in the cutting processing; a calculation unit is configured to derive information for predicting whether the chips can be broken using the information received by the receiving unit; and a communication unit is configured to communicate with the input-output device to display the information for predicting whether the chips can be broken, derived by the calculation unit, on a display unit of the input-output device.

9. A control device as described in claim 8, wherein the calculation unit is configured to calculate the tensile strain generated in the chips formed by the cutting process based on the initial curling radius and chip thickness of the chips, and is configured to correct the tensile strain using the chamfer width or tool tip radius of the tool represented by the information received by the receiving unit, and the cutting thickness obtained based on the tool nose radius, the tool cross-cutting angle, the feed speed and the cutting amount represented by the information received by the receiving unit.

10. A control device as described in claim 8, wherein the calculation unit is configured to obtain the initial curling radius and the rake angle in each section based on the section of the tool in the direction perpendicular to the cross-cutting knife and the section at the bisector of the top angle of the tool represented by the information received by the receiving unit, and is configured to calculate the initial curling radius and the rake angle in the chip outflow direction based on the cutting process by interpolation or extrapolation based on the initial curling radius and the rake angle in each section obtained.

11. A control device as described in claim 8, wherein the communication unit is configured to communicate with the input-output device to display the following image on the display unit, namely, an image that represents the distribution of tensile strain generated in the chips by contour lines in a coordinate system with the cutting conditions as coordinate axes and shows the fracture boundaries of the chips.

12. A control device as described in claim 11, wherein the communication unit is configured to communicate with the input and output device to display the distribution of tensile strain generated in the chips on the display unit by one or more methods selected from color, hue depth, and brightness.

13. The control device according to claim 8, wherein the calculation unit is configured to compare the distance from the tool tip to the apex of the chip breaker groove with the chip thickness, and predict that the chip will not break when the chip thickness is large.

14. A control device as described in claim 8, wherein the calculation unit is configured to calculate the chip disconnection properties of all tools represented by the information stored in the storage unit, and the communication unit is configured to communicate with the input and output device to display an overview of the chip disconnection properties of each tool on the display unit based on the calculation results obtained by the calculation unit.

15. A chip breakability prediction method, wherein a receiving unit receives information related to a workpiece and a tool to be cut and used in a cutting process, selected from information stored in a storage unit, and the receiving unit receives information indicating a feed rate and a cutting depth in the cutting process. Using the information received by the receiving unit, a calculation unit derives information for predicting whether chips can be broken, and the information derived by the calculation unit is displayed on a display unit.

16. A chip breakage prediction method as described in claim 15, wherein the tensile strain generated in the chips formed by the cutting process is calculated by the calculation unit based on the initial curling radius and chip thickness of the chips, and the tensile strain is corrected by the calculation unit using the chamfer width or tool tip radius of the tool represented by the information received by the receiving unit, and the cutting thickness obtained based on the tool nose radius, the tool cross-cutting angle, the feed speed and the cutting amount represented by the information received by the receiving unit.

17. A chip breakage prediction method as described in claim 15, wherein the initial curling radius and rake angle in each section are obtained by the calculation unit based on the cross-section of the tool in the direction perpendicular to the cross-cutting cutter and the cross-section at the bisector of the top angle of the tool represented by the information received by the receiving unit, and based on the initial curling radius and the rake angle in each section obtained, the initial curling radius and the rake angle in the chip outflow direction based on the cutting process are calculated by the calculation unit through interpolation or extrapolation.

18. The chip breaking property prediction method according to claim 15 , wherein the distance from the cutting edge of the cutting tool to the top of the chip breaker groove is compared with the chip thickness by the calculation unit, and when the chip thickness is large, it is predicted that the chip will not break.

19. A chip breaking property prediction method, wherein information related to a workpiece and a tool to be cut and used in a cutting process selected from information stored in a storage unit is received from an input / output device, and information indicating a feed rate and a depth of cut in the cutting process is received from the input / output device; information for predicting whether chips can be broken when the workpiece, tool, feed rate, and depth of cut indicated by the information received from the input / output device is derived by a calculation unit; and communication is performed with the input / output device by a communication unit to display the information derived by the calculation unit on a display unit of the input / output device.