Machining simulation device, machining simulation method, machining simulation program, machining method, and workpiece determination method

Abstract

To more accurately predict the roundness of a workpiece after machining. [Solution] A first aspect of the present invention is a cutting process simulation device for simulating a cutting process. The cutting process simulation device includes a parameter acquisition unit that acquires parameters related to a cylindrical workpiece and parameters related to a chuck for holding the workpiece. The cutting process simulation device includes a simulation unit that simulates the cutting process using the parameters acquired by the parameter acquisition unit. The parameter acquisition unit acquires measured values ​​of roundness obtained by measuring the side surface of the workpiece before machining as parameters related to the workpiece. The simulation unit simulates the roundness of the side surface of the workpiece after machining using the parameters related to the chuck and the measured values.

Description

Technical Field

[0001] The present invention relates to a cutting simulation device, a cutting simulation method, a cutting simulation program, a cutting method, and a workpiece determination method.

Background Art

[0002] A cutting simulation device mainly performs simulation based on basic parameters related to a tool and a workpiece, and predicts the shape and dimensions of the workpiece after machining (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the known technology, it is not possible to sufficiently predict precise shape errors such as the roundness of the workpiece after machining, and in particular, factors that affect the roundness of the workpiece after machining are not sufficiently considered. As a result, in the known technology, there is a problem that a deviation occurs between the simulation result and the actual machining result, and it is difficult to set optimal machining conditions.

Means for Solving the Problems

[0005] One aspect of the present invention is a machining simulation device for simulating a machining process. The machining simulation device includes a parameter acquisition unit that acquires parameters related to a cylindrical workpiece and parameters related to a chuck for holding the workpiece. The machining simulation device includes a simulation unit that simulates the machining process using the parameters acquired by the parameter acquisition unit. The parameter acquisition unit acquires measured values ​​of roundness obtained by measuring the side surface of the workpiece before machining as parameters related to the workpiece. The simulation unit simulates the roundness of the side surface of the workpiece after machining using the parameters related to the chuck and the measured values.

[0006] One aspect of the present invention is a machining simulation method for simulating a cutting process. The machining simulation method includes obtaining parameters related to a cylindrical workpiece and parameters related to a chuck for holding the workpiece. The machining simulation method includes simulating the cutting process using the obtained parameters. As parameters related to the workpiece, the machining simulation method obtains measured values ​​of roundness obtained by measuring the side surface of the workpiece before machining. The machining simulation method simulates the roundness of the side surface of the workpiece after machining using the parameters related to the chuck and the measured values.

[0007] One aspect of the present invention is a machining simulation program that causes a computer to function as a machining simulation device for simulating a machining process. The machining simulation program causes the computer to function as a parameter acquisition unit that acquires parameters related to a cylindrical workpiece and parameters related to a chuck for holding the workpiece. The machining simulation program causes the computer to function as a simulation unit that simulates the machining process using the parameters acquired by the parameter acquisition unit. The parameter acquisition unit acquires measured values ​​of roundness obtained by measuring the side surface of the workpiece before machining as parameters related to the workpiece. The simulation unit uses the parameters related to the chuck and the measured values ​​to simulate the roundness of the side surface of the workpiece after machining.

[0008] One aspect of the present invention is a machining method for machining a cylindrical workpiece. The machining method includes simulating the machining process. The machining method includes machining the workpiece using the simulation results. The simulation of the machining process includes obtaining parameters related to the workpiece and parameters related to a chuck for holding the workpiece. The simulation of the machining process includes simulating the machining process using the obtained parameters. The simulation of the machining process obtains measured values ​​of roundness obtained by measuring the side surface of the workpiece before machining as parameters related to the workpiece. The simulation of the machining process simulates the roundness of the side surface of the workpiece after machining using the parameters related to the chuck and the measured values. The machining method machines the workpiece according to the simulation results so that the roundness of the side surface of the workpiece after machining is a desired roundness.

[0009] One aspect of the present invention is a workpiece determination method for determining the suitability of a cylindrical workpiece for use in machining. The workpiece determination method includes simulating the machining process. The workpiece determination method includes determining whether the workpiece is suitable using the simulation results. The simulation of the machining process includes obtaining parameters related to the workpiece and parameters related to the chuck for holding the workpiece. The simulation of the machining process includes simulating the machining process using the obtained parameters. As parameters related to the workpiece, the simulation of the machining process obtains measured values ​​of roundness obtained by measuring the side surface of the workpiece before machining. The simulation of the machining process simulates the roundness of the side surface of the workpiece after machining using the parameters related to the chuck and the measured values. The workpiece determination method determines that the workpiece is suitable when the roundness of the side surface of the workpiece after machining obtained by the simulation is the desired roundness. [Effects of the Invention]

[0010] A machining simulation device according to one aspect of the present invention can precisely predict the roundness of the side surface of a workpiece after machining by incorporating measured values ​​regarding the roundness of the side surface of the workpiece before machining into the simulation. This improves the accuracy between the simulation results and the actual machining results, allowing users to obtain more reliable simulation results as a basis for determining optimal machining conditions. Ultimately, this is expected to improve machining accuracy and product quality.

[0011] The parameter acquisition unit may acquire measured values ​​obtained by measuring the roundness of the side surface at the measurement position in the axial direction of the workpiece before machining. The simulation unit may use the measured values ​​to simulate the shape of the entire side surface of the workpiece before machining. The simulation unit may use the parameters related to the chuck and the simulation results of the shape of the entire side surface of the workpiece before machining to simulate the roundness of the side surface of the workpiece after machining. This embodiment of the cutting simulation device enables simulation that accurately reflects the influence of the roundness of the measurement position in the axial direction, and can more accurately predict the roundness of the side surface of the workpiece after machining. Consequently, an improvement in machining accuracy can be expected.

[0012] The parameter acquisition unit may acquire, as measured values, a first measured value of roundness obtained by measuring the side surface of the first measurement position in the axial direction, and a second measured value of roundness obtained by measuring the side surface of the second measurement position. The simulation unit may use the first measured value to simulate the shape of the first circle corresponding to the side surface of the first measurement position. The simulation unit may use the second measured value to simulate the shape of the second circle corresponding to the side surface of the second measurement position. The simulation unit may use coordinates on a straight line connecting a point on the first circle and a point on the second circle to simulate the shape of the entire side surface of the workpiece before machining. This embodiment of the cutting simulation device enables a three-dimensional simulation of the shape error of the entire workpiece, and can predict the roundness of the entire side surface of the workpiece, not just the measured portion, with greater precision. As a result, further improvement in machining accuracy can be expected.

[0013] The parameter acquisition unit may acquire multiple types of parameters related to the chuck. The simulation unit may use multiple types of parameters and measured values ​​to simulate the roundness of the side surface of the workpiece after machining. This embodiment of the cutting simulation device makes it possible to evaluate the influence of the chuck characteristics on the roundness of the workpiece after machining from more angles, and to accurately predict the roundness of the side surface of the workpiece after machining. Consequently, it becomes possible to select the optimal machining conditions according to the chuck settings and conditions, and improvements in machining accuracy and product quality can be expected.

[0014] The simulation unit may use the inverse of the coordinates of the side surface of the machined workpiece held in the chuck to simulate the shape of the machined workpiece after it has been removed from the chuck. This embodiment of the cutting simulation device makes it possible to more accurately predict the shape after the workpiece has actually been removed, while taking into account the effects of being held by the chuck. Consequently, it is possible to understand in advance any distortion or deformation of the shape that may occur after removal from the chuck, thereby further improving machining accuracy and ensuring high reliability in quality control of the final product.

[0015] The simulation unit may simulate the roundness of the side surface of the workpiece after machining, using parameters related to the chuck and an arbitrary roundness of the side surface of the workpiece before machining. This embodiment of the cutting simulation device enables simulation according to the roundness of the side surface of the workpiece before machining as requested by the user. Consequently, it becomes easier to optimize the machining conditions according to specific requirements.

[0016] One embodiment of the present invention provides a cutting simulation method that enables precise simulation based on the roundness of the side surface of the workpiece before machining. Consequently, it allows for a more accurate prediction of the roundness of the side surface of the workpiece after machining, improving actual machining accuracy and enabling the setting of appropriate machining conditions based on the simulation results.

[0017] The cutting simulation program according to one aspect of the present invention can accurately simulate the roundness of the side surface of the workpiece after machining. As a result, automation of the simulation and improvement of accuracy can be achieved, and optimization of the machining process at the design stage becomes possible.

[0018] The cutting method according to one aspect of the present invention improves the machining accuracy for ensuring the desired roundness of the side surface of the workpiece after machining by performing the machining of the workpiece based on the simulation results. As a result, improvement in the quality of the product and efficiency of the machining process are expected.

[0019] The workpiece determination method according to one aspect of the present invention can determine the suitability of the workpiece based on the simulation results. As a result, the suitability of the workpiece can be confirmed before machining, reducing the risk of machining defects due to inappropriate workpieces and strengthening the quality assurance of the product.

Brief Description of the Drawings

[0020] [Figure 1] It is a block diagram showing an example of the configuration of the cutting simulation apparatus 100. [Figure 2] It is a flowchart showing an example of the operation method of the cutting simulation apparatus 100. [Figure 3] It is a flowchart showing an example of the flow of the operation of measuring the roundness of the side surface of the workpiece W1 before machining. [Figure 4] It is a diagram showing an example of the measurement position on the workpiece W1 before machining. [Figure 5] It is a diagram showing an example of the actually measured value of the roundness obtained by measuring the side surface in the circumferential direction of the first measurement position MP1. [Figure 6] It is a diagram showing an example of the actually measured value of the roundness obtained by measuring the side surface in the circumferential direction of the second measurement position MP2. [Figure 7] It is a diagram showing an example of the actually measured value of the roundness obtained by measuring the side surface in the circumferential direction of the third measurement position MP3. [Figure 8]It is a diagram showing an example of the flow of a cutting process simulation executed using the roundness of the side surface of the workpiece W1 before machining that has been measured. [Figure 9] It is a diagram for explaining a circle passing through the coordinates of the side surface at the measurement position. [Figure 10] It is a diagram for explaining connecting points on adjacent circles with a straight line. [Figure 11] It is a diagram showing an example of the workpiece model WM displayed on the display 150. [Figure 12] It is a diagram showing an example of a circle image displayed on the display 150 together with the workpiece model WM. [Figure 13] It is a diagram showing an example of the chuck model CM displayed on the display 150 together with the workpiece model WM. [Figure 14] It is a diagram showing an example of the deformed workpiece model DWM displayed on the display 150. [Figure 15] It is a diagram showing an example of the machined workpiece model MWM displayed on the display 150. [Figure 16] It is a diagram showing an example of the measured value of the roundness of the side surface of the machined workpiece W1 machined according to the simulation result.

Embodiments for Carrying Out the Invention

[0021] Hereinafter, the present invention will be described through embodiments, but the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution means of the invention.

[0022] Figure 1 is a block diagram showing an example of the configuration of the cutting simulation device 100. The cutting simulation device 100 is a computer that simulates the cutting of a cylindrical workpiece W1 as shown in Figure 4. Simulation is a computer simulation that reproduces complex physical phenomena and the behavior of artificial objects using numerical calculations and information processing by a computer. The cutting simulation device 100 includes a CPU 110, main memory 120, input / output interface 130, input device 140, display 150, and storage 160.

[0023] The CPU 110 is a device that controls the main memory 120, input / output interface 130, input device 140, display 150, and storage 160, and performs data calculations, etc.

[0024] The main memory 120 is a storage device in the cutting simulation device 100 that stores data and programs, and is connected to the CPU 110 via electrical wiring on the circuit board. For example, the main memory 120 stores the program code currently being executed, data necessary for immediate processing, etc., related to the cutting simulation.

[0025] The input / output interface 130 connects the input device 140, display 150, and storage 160 from the CPU 110 via cables, etc., and is a mechanism for sending and receiving data and control information.

[0026] The input device 140 is a device for inputting data, information, instructions, etc., into the cutting simulation device 100. The input device 140 is used, for example, to input data, information, instructions, etc., necessary for simulating cutting operations.

[0027] The display 150 is a display device that illuminates its screen to display images and information. The display 150 is used, for example, to display information related to machining simulations.

[0028] Storage 160 is a storage device that permanently stores data among the storage devices that store data and programs in the cutting simulation device 100.

[0029] The CPU 110 functions as a parameter acquisition unit 111, a simulation unit 112, a modeling unit 113, and a display control unit 114, based on the cutting simulation program installed in the cutting simulation device 100. The cutting simulation program is a computer program that enables the computer to function as the cutting simulation device 100.

[0030] The parameter acquisition unit 111 is a software module that acquires parameters related to the cylindrical workpiece W1 and parameters related to the chuck. The chuck is a component attached to the end of the spindle of a machine tool to hold the workpiece W1. The machine tool is a machine that holds the workpiece W1 with the chuck and cuts the workpiece W1.

[0031] The simulation unit 112 is a software module that simulates cutting processes using the parameters acquired by the parameter acquisition unit 111.

[0032] The modeling unit 113 is a software module that models the manufacturing process using the results of the simulation performed by the simulation unit 112. Modeling is the process of creating the outline of a desired three-dimensional object by combining points, lines, planes, curved surfaces, and simple three-dimensional shapes.

[0033] The display control unit 114 is a software module that controls the display of the display 150. The display control unit 114 displays information about the parameters acquired by the parameter acquisition unit 111 on the display 150. The display control unit 114 displays the simulation results from the simulation unit 112 on the display 150. The display control unit 114 displays the model created by the modeling unit 113 on the display 150.

[0034] Storage 160 stores work data WD, check data CD, simulation data SD, and model data MD.

[0035] Work data WD is data that includes multiple types of parameters related to a cylindrical workpiece W1. Work data WD includes the roundness of workpiece W1 as one of its parameters. The roundness parameter of workpiece W1 is a parameter that can identify the measured value of roundness obtained by measuring the side surface of workpiece W1 before machining. Roundness is the degree of deviation from a perfect circle in the circular portion of workpiece W1. In addition to the roundness of workpiece W1, work data WD includes parameters such as shape and dimensions, tolerances, surface roughness, material, mechanical properties, and thermal properties. The shape and dimension parameters are parameters that can identify the shape and dimensions of workpiece W1. The tolerance parameters are parameters that can identify the dimensional tolerances of workpiece W1. The surface roughness parameter is data that can identify the surface finish requirements of workpiece W1. The material parameter is a parameter that can identify the material of the workpiece W1 being machined, such as copper, aluminum, or titanium. The parameters for mechanical properties are parameters that can identify the mechanical properties of the workpiece W1 being processed, such as tensile strength, elastic modulus, hardness, and density. The parameters for thermal properties are parameters that can identify the thermal properties of the workpiece W1 being processed, such as thermal conductivity, specific heat, and coefficient of thermal expansion.

[0036] The chuck data CD contains data with multiple types of parameters related to the chuck. These parameters include, for example, type, number of jaws, jaw width, curvature, holding force, and phase. The type parameter identifies the type of chuck, such as scroll chuck, independent chuck, swing chuck, collet chuck, magnetic chuck, hydraulic chuck, or pneumatic chuck. The number of jaws parameter identifies the number of jaws in the chuck. The jaw width parameter identifies the length of the jaws in a direction perpendicular to both the axial direction and the radial direction of the cylindrical workpiece W1. The curvature parameter identifies the curvature of the jaws at the point where they contact the workpiece W1. The holding force parameter identifies the magnitude of the force with which the chuck holds the workpiece W1. The phase parameter identifies the position in the circumferential direction of the workpiece W1 where the chuck holds the workpiece W1.

[0037] Simulation data (SD) includes data generated by the simulation. This data includes, for example, intermediate data generated during the simulation process and the final data generated as a result of the simulation.

[0038] The simulation data SD may include data to improve the accuracy of the simulation. Data to improve the accuracy of the simulation may include, for example, tool data, machining condition data, cooling data, machine tool data, environmental data, and simulation settings. Tool data may include, for example, data that can identify the shape and dimensions of the tool, tool material, tool coating, etc. Machining condition data may include, for example, data that can identify the cutting speed, feed rate, depth of cut, cutting direction, etc. Cooling data may include, for example, data that can identify the type of coolant, coolant flow rate, etc. Machine tool data may include, for example, data that can identify the rigidity of the machine tool, machine tool structure, control data, etc. Environmental data may include, for example, data that can identify the ambient temperature, humidity, etc. Simulation settings data may include, for example, data that can identify the type of simulation, analysis accuracy, etc.

[0039] Model data (MD) consists of the data necessary for modeling and the data generated by the modeling process.

[0040] The data required for modeling includes templates for the 3D model of workpiece W1, the 3D model of the chuck, and other such data.

[0041] The 3D model template for workpiece W1 is the 3D model used as a template when the modeling unit 113 models workpiece W1. The 3D model template for workpiece W1 is modeled assuming that the roundness of the inner and outer sides of the cylindrical workpiece W1 is 100%.

[0042] The 3D model template for Chuck is a 3D model used as a template when the modeling unit 113 models Chuck.

[0043] The data generated by the modeling process includes intermediate data generated during the modeling process by the modeling unit 113. The data generated by the modeling process also includes the final data generated as a result of the modeling by the modeling unit 113.

[0044] Figure 2 is a flowchart showing an example of how to operate the cutting simulation device 100.

[0045] First, the operator measures the roundness of the side surface of the workpiece W1 before machining in order to use the cutting simulation device 100 (S1). The roundness of the side surface of the workpiece W1 before machining is a parameter necessary for the cutting simulation device 100 to perform the simulation. In S1, the operator measures the roundness of at least one side surface of the workpiece W1, between the inner side surface and the outer side surface.

[0046] Figure 3 is a flowchart showing an example of the workflow for measuring the roundness of the side surface of a workpiece W1 before processing.

[0047] First, the operator determines the measurement positions for measuring the roundness of the side surface of the workpiece W1 before machining (S101). In S101, the operator determines multiple positions in the axial direction AX of the workpiece W1 before machining as measurement positions.

[0048] Figure 4 shows an example of measurement positions on a workpiece W1 before machining. In the example shown in Figure 4, the operator determines the first measurement position MP1, the second measurement position MP2, and the third measurement position MP3 as measurement positions in the axial direction AX of the workpiece W1 before machining. The first measurement position MP1 is the position of one end of the workpiece W1 in the axial direction. The second measurement position MP2 is the position midway between the one end and the other end of the workpiece W1 in the axial direction. The third measurement position MP3 is the position of the other end of the workpiece W1 in the axial direction.

[0049] Returning to the explanation of Figure 3, the next step is for the operator to measure the roundness of the side surface of the measurement position (S102). In S102, the operator measures the roundness of the side surface in the circumferential direction of the measurement position at predetermined angle intervals, using a reference point taken on the measurement position as a reference. In S102, the operator measures the roundness of at least one side surface of the workpiece W1, between the inner and outer sides. In the example shown in Figure 4, the operator measures the roundness of the side surface in the circumferential direction of the first measurement position MP1 at predetermined angle intervals, using a first reference point O1 taken on the first measurement position MP1 as a reference. The operator also measures the roundness of the side surface in the circumferential direction of the second measurement position MP2 at predetermined angle intervals, using a second reference point O2 taken on the second measurement position MP2 as a reference. The operator also measures the roundness of the side surface in the circumferential direction of the third measurement position MP3 at predetermined angle intervals, using a third reference point O3 taken on the third measurement position MP3 as a reference. A measurer can, for example, measure the roundness of the side surface of the measurement location using a roundness measuring machine. A roundness measuring machine is a device for evaluating how close the shape of an object is to an ideal circle. Alternatively, a measurer can, for example, measure the roundness of the side surface of the measurement location using a coordinate measuring machine. A coordinate measuring machine is a device for measuring the dimensions of an object with high precision. Alternatively, a measurer can, for example, measure the roundness of the side surface of the measurement location using a dial gauge. A dial gauge is a precision measuring instrument for accurately measuring displacement over very small distances. Alternatively, a measurer can, for example, use an optical measuring machine, which is a device for measuring the shape, dimensions, position, reflection characteristics, transmission characteristics, etc., of an object using light.

[0050] After measuring the roundness of the side surface at one measurement location, the measurer checks if there are any other measurement locations where the roundness has not been measured (S103).

[0051] If there are other measurement locations where roundness has not been measured in S103 (S103; YES), the measurer measures the roundness of the sides of the other measurement locations where roundness has not been measured (S102).

[0052] If there are no other measurement locations where roundness has not been measured in S103 (S103; NO), the operator completes the task of measuring the roundness of the side surface of the workpiece W1 before machining.

[0053] Figure 5 shows an example of measured roundness values ​​obtained by measuring the circumferential side surface of the first measurement position MP1. Figure 6 shows an example of measured roundness values ​​obtained by measuring the circumferential side surface of the second measurement position MP2. Figure 7 shows an example of measured roundness values ​​obtained by measuring the circumferential side surface of the third measurement position MP3.

[0054] Figure 5 shows the measured roundness obtained by measuring the outer surface in the circumferential direction of the first measurement position MP1, with the angle of the first reference point O1 as viewed from axis AX set to 0 degrees. Figure 6 shows the measured roundness obtained by measuring the outer surface in the circumferential direction of the second measurement position MP2, with the angle of the second reference point O2 as viewed from axis AX set to 0 degrees. Figure 7 shows the measured roundness obtained by measuring the outer surface in the circumferential direction of the third measurement position MP3, with the angle of the third reference point O3 as viewed from axis AX set to 0 degrees.

[0055] Here, the measured values ​​of roundness range from a few micrometers to several hundred micrometers. Therefore, differences in roundness in the circumferential direction are difficult to discern when displayed in actual size. For this reason, the roundness shown in Figures 5 to 7 is an enlargement of the measured values ​​by several thousand times.

[0056] In the example shown in Figure 5, the roundness of the side surface of the first measurement position MP1 is smallest at positions approximately 30 degrees and 210 degrees counterclockwise from the first reference point O1. Conversely, the roundness of the side surface of the first measurement position MP1 is largeest at positions approximately 120 degrees and 300 degrees counterclockwise from the first reference point O1.

[0057] In the example shown in Figure 6, the roundness of the side surface of the second measurement position MP2 is smallest at approximately 30 degrees and 210 degrees counterclockwise from the second reference point O2. Conversely, the roundness of the side surface of the second measurement position MP2 is largeest at approximately 120 degrees and 300 degrees counterclockwise from the second reference point O2.

[0058] In the example shown in Figure 7, the roundness of the side surface of the third measurement position MP3 is smallest at approximately 30 degrees and 210 degrees counterclockwise from the third reference point O3. Conversely, the roundness of the side surface of the third measurement position MP3 is largest at approximately 120 degrees and 300 degrees counterclockwise from the third reference point O3.

[0059] Returning to the explanation of Figure 2, the operator of the cutting simulation device 100 then performs a cutting simulation using the roundness of the side surface of the workpiece W1 before machining, which was measured in S1 (S2).

[0060] Figure 8 shows an example of the flow of a cutting simulation performed using the measured roundness of the side surface of the workpiece W1 before machining.

[0061] First, the parameter acquisition unit 111 of the cutting simulation device 100 acquires parameters related to the workpiece W1 (S201). In S201, the operator selects conditions related to the workpiece W1. For example, the operator selects conditions such as shape and dimensions, tolerances, surface roughness, material, mechanical properties, and thermal properties. Once the conditions related to the workpiece W1 before machining are selected, the parameter acquisition unit 111 refers to the work data WD stored in the storage 160 and acquires parameters corresponding to the selected conditions. The operator also inputs a roundness parameter that can identify the measured value of the roundness of the side surface of the workpiece W1 before machining, which was measured in S1. Once the roundness parameter is input, the parameter acquisition unit 111 acquires the measured value of the roundness of the side surface of the workpiece W1 before machining, which is identified by the roundness parameter. The parameter acquisition unit 111 also stores the roundness parameter of the workpiece W1 in the work data WD.

[0062] Next, the simulation unit 112 of the cutting simulation device 100 calculates the coordinates of the side surface of the measurement position where the roundness was measured (S202). In S202, the simulation unit 112 calculates the coordinates in the local coordinate system. The local coordinate system is a coordinate system for representing the shape of the workpiece W1. The local coordinate system is used to handle the shape and deformation of the workpiece W1 placed in space. The local coordinate system takes its origin at one of the vertices or its vicinity on the workpiece W1, and can describe the position and orientation of points, lines, faces, etc. that constitute the workpiece W1. The parameter of roundness obtained by measurement is expressed in polar coordinates. The parameter of roundness is the radial displacement Δrθ from r0 at each angle on the side surface of the workpiece W1, where r0 is the radius of the circle. Here, θ is the rotation angle at the time of measurement. Therefore, if rθ is the actual radius of the workpiece W1 at a certain angle, then rθ = r0 + Δrθ. The simulation unit 112 converts the data obtained in polar coordinates to a Cartesian coordinate system in order to determine the coordinates of the side in the local coordinate system. Specifically, the simulation unit 112 calculates the coordinates of the side in the local coordinate system using the conversion formulas xθ=rθ·cosθ and yθ=rθ·sinθ. Here, xθ and yθ are the coordinates of points on the side of the workpiece W1 in the local coordinate system. The simulation unit 112 calculates the coordinates of the side for each measurement position where the roundness is measured. In this example, the simulation unit 112 calculates the coordinates of the side at the first measurement position MP1, the side at the second measurement position MP2, and the side at the third measurement position MP3.

[0063] Next, the simulation unit 112 simulates the shape of the entire side surface of the workpiece W1 before machining (S203). In S203, the simulation unit 112 first simulates the shape of a circle that passes through the coordinates of the side surface of the measurement position calculated in S202, corresponding to the side surface of the measurement position where the roundness was measured. The circle that passes through the coordinates of the side surface of the measurement position is a circle on a plane parallel to the XY plane in the local coordinate system. For each measurement position where the roundness was measured, the simulation unit 112 simulates the shape of a circle that passes through the coordinates of the side surface of the measurement position.

[0064] Figure 9 illustrates a circle that passes through the coordinates of the side of the measurement location.

[0065] In this example, the simulation unit 112 simulates a first circle C1 that passes through the coordinates of the side surface of the first measurement position MP1, which corresponds to the side surface of the first measurement position MP1 where the roundness was measured. The first circle C1 is a circle on the first plane PL1, which is parallel to the XY plane in the local coordinate system. The simulation unit 112 also simulates a second circle C2 that passes through the coordinates of the side surface of the second measurement position MP2, which corresponds to the side surface of the second measurement position MP2, where the roundness was measured. The second circle C2 is a circle on the second plane PL2, which is parallel to the XY plane in the local coordinate system. The simulation unit 112 also simulates a third circle C3 that passes through the coordinates of the side surface of the third measurement position MP3, which corresponds to the side surface of the third measurement position MP3, where the roundness was measured. The third circle C3 is a circle on the third plane PL3, which is parallel to the XY plane in the local coordinate system.

[0066] The simulation unit 112 then simulates the overall shape of the workpiece W1 before machining using coordinates on a straight line connecting points on the circle corresponding to the sides of adjacent measurement positions. The points connected by the straight line are points on the circle corresponding to the sides of the measurement positions that are at the same angle from the center of the circle. The simulation unit 112 considers the coordinates of the sides of positions where the roundness has not been measured to be equivalent to coordinates on the straight line.

[0067] Figure 10 illustrates how to connect adjacent points on circles with straight lines.

[0068] In this example, the simulation unit 112 connects a first point PT1 on the first circle C1 corresponding to the side surface of the first measurement position MP1 and a second point PT2 on the second circle C2 corresponding to the side surface of the second measurement position MP2 with a first straight line L1. The first point PT1 and the second point PT2 are points that are at the same angle when viewed from the center of the circle. The simulation unit 112 then considers the coordinates of the side surface at the position between the first circle C1 and the second circle C2 where the roundness has not been measured to correspond to coordinates on the first straight line L1.

[0069] Furthermore, the simulation unit 112 connects the second point PT2 on the second circle C2, which corresponds to the side surface of the second measurement position MP2, and the third point PT3 on the third circle C3, which corresponds to the side surface of the third measurement position MP3, with the second straight line L2. The second point PT2 and the third point PT3 are points that are at the same angle when viewed from the center of the circle. The simulation unit 112 then considers the coordinates of the side surface at the position between the second circle C2 and the third circle C3 where the roundness has not been measured to correspond to the coordinates on the second straight line L2.

[0070] Returning to the explanation of Figure 8, next, the modeling unit 113 of the cutting simulation device 100 models the workpiece W1 before machining (S204). In S204, the modeling unit 113 models the workpiece W1 using the shape and dimensions parameters acquired in S201 and the data of the overall side shape simulated in S203.

[0071] Next, the display control unit 114 of the cutting simulation device 100 displays the workpiece model WM, which is a model of the workpiece W1 before machining, on the display 150 (S205). In S205, the display control unit 114 displays the workpiece model WM, which was modeled in S204, on the display 150.

[0072] Figure 11 shows an example of a work model WM displayed on display 150.

[0073] As mentioned above, the measured value of roundness ranges from a few micrometers to several hundred micrometers. Therefore, the variation in the radius of the workpiece W1 in the circumferential direction is difficult to discern simply by looking at the workpiece model WM. To address this, the display control unit 114 may display a circular image showing the shape of a circle passing through the coordinates of the side of the measurement position simulated in S203 on the display 150 along with the workpiece model WM.

[0074] Figure 12 shows an example of a circular image displayed on display 150 along with the work model WM.

[0075] In the example shown in Figure 12, the display control unit 114 displays three circular images, the first circular image CI1, the second circular image CI2, and the third circular image CI3, together with the workpiece model WM. The first circular image CI1 shows the shape of the first circle C1 passing through the coordinates of the side of the first measurement position MP1. The second circular image CI2 shows the shape of the second circle C2 passing through the coordinates of the side of the second measurement position MP2. The third circular image CI3 shows the shape of the third circle C3 passing through the coordinates of the side of the third measurement position MP3. In the example shown in Figure 12, the circular images show the radii of each point on the circle passing through the coordinates of the side of the measurement position, with the variation value of the radius of the workpiece W1 magnified by several thousand times.

[0076] Returning to the explanation of Figure 8, the parameter acquisition unit 111 of the cutting simulation device 100 then acquires parameters related to the chuck (S206). In S206, the operator selects conditions related to the chuck. For example, the operator selects conditions such as type, number of jaws, jaw width, curvature, holding force, and phase. Once the chuck conditions are selected, the parameter acquisition unit 111 refers to the chuck data CD stored in the storage 160 and acquires the parameters corresponding to the selected conditions.

[0077] Next, the modeling unit 113 models the chuck (S207). In S207, the modeling unit 113 models the chuck using parameters such as type obtained in S206.

[0078] Next, the display control unit 114 displays the chuck model CM, which is a model of the chuck, on the display 150 along with the work model WM (S208). In S208, the display control unit 114 displays the chuck model CM, which was modeled in S207, on the display 150 along with the work model WM, which was modeled in S204.

[0079] Figure 13 shows an example of a chuck model CM displayed on the display 150 along with the work model WM.

[0080] In the example shown in Figure 13, the display control unit 114 displays a chuck model CM in a state where the chuck is holding the workpiece W1. In the example shown in Figure 13, the chuck model CM includes a first jaw model JM1, a second jaw model JM2, and a third jaw model JM3, each modeled with three jaws. The first jaw model JM1 is displayed so as to contact the workpiece model WM at the position of the origin of the workpiece model WM, which corresponds to the reference point when the roundness of the side surface was measured. The second jaw model JM2 is displayed so as to contact the workpiece model WM at a position 120 degrees counterclockwise from the origin. The third jaw model JM3 is displayed so as to contact the workpiece model WM at a position 240 degrees counterclockwise from the origin.

[0081] Here, the workpiece W1 deforms when held in the chuck. The amount of deformation of the workpiece W1 when held in the chuck ranges from a few micrometers to several hundred micrometers. Therefore, even if the operator looks at a model like the one shown in Figure 13, they cannot recognize the shape of the workpiece W1 before machining, which has been deformed while being held in the chuck.

[0082] Returning to the explanation of Figure 8, the simulation unit 112 then simulates the shape of the workpiece W1 before machining, which has been deformed while being held by the chuck (S209). In S209, the operator first retrieves, for example, the workpiece model WM modeled in S204 and the chuck model CM modeled in S207. The workpiece model WM includes the shape and material properties of the workpiece W1. The chuck model CM includes the shape and structure of the chuck. The operator also sets the friction coefficient of the contact surface as needed. Next, the operator sets the boundary conditions to be used in the simulation, for example. Specifically, the operator defines the holding force that the chuck applies to the workpiece W1, and also sets its direction and distribution. The operator also sets how other parts of the workpiece W1 are fixed. Next, the operator divides, for example, the workpiece model WM and the chuck model CM into a mesh for use in the finite element method simulation. The fineness of the mesh is adjusted according to the parts where detailed deformation analysis is required. In particular, a fine mesh is required in areas where stress concentration is expected and near the contact surface. Next, the simulation unit 112 performs a simulation using, for example, a finite element method simulation program. This allows the simulation unit 112 to calculate the stresses and deformations occurring in the workpiece W1.

[0083] Next, the modeling unit 113 models the shape of the workpiece W1 before machining, which has been deformed while being held in the chuck (S210). In S210, the modeling unit 113 uses the simulation results from S209 to model the shape of the workpiece W1 before machining, which has been deformed while being held in the chuck, so that the stress distribution and deformation can be seen.

[0084] Next, the display control unit 114 displays a model of the workpiece W1 before processing, which is held in the chuck and deformed, on the display 150 (S211). In S211, the display control unit 114 displays the deformed workpiece model DWM, which is the model created in S210, on the display 150.

[0085] Figure 14 shows an example of a deformed work model DWM displayed on display 150.

[0086] As mentioned above, the deformation of the workpiece W1 when held in the chuck ranges from a few micrometers to several hundred micrometers. Therefore, in the example shown in Figure 14, the deformed workpiece model DWM is modeled at several thousand times its original size so that the deformation can be clearly seen.

[0087] In the example shown in Figure 14, the deformed workpiece model DWM is a model of the workpiece W1 before machining, which has been deformed while being held in the chuck, with the face perpendicular to the side facing forward. In the example shown in Figure 14, the deformed workpiece model DWM has a triangular shape. The three parts corresponding to the sides of the triangle correspond to the parts in contact with the chuck jaws. By examining the deformed workpiece model DWM, the operator can confirm the deformation of the workpiece W1 before machining while it is held in the chuck.

[0088] Returning to the explanation of Figure 8, the simulation unit 112 then simulates the cutting process (S212). In S212, the operator first calls up, for example, the chuck model CM modeled in S207 and the deformable workpiece model DWM modeled in S210. The operator may also call up a cutting tool model in which the shape of the cutting tool is modeled to improve the accuracy of the simulation. The cutting tool model only needs to be pre-modeled. Next, the operator defines, for example, the characteristics of the workpiece W1 to be machined. This allows the simulation unit 112 to realistically simulate the reaction of the workpiece W1. The operator may also set machining conditions to improve the accuracy of the simulation. Machining conditions include, for example, cutting speed, feed rate, depth of cut, and coolant usage. Next, the operator generates a mesh that divides the model into finer elements. The mesh is used by the simulation unit 112 to calculate the physical behavior during the simulation. The density and shape of the mesh affect the accuracy and computational cost of the simulation. Then, the simulation unit 112 performs the cutting simulation.

[0089] Here, the inventors noticed that there was an error between the shape of the model of the workpiece W1 after machining obtained by the machining simulation and the actual shape of the workpiece W1 obtained according to the simulation results. The inventors then found that the error was caused by the fact that the shape of the workpiece W1 after machining obtained by the machining simulation was the shape of the workpiece W1 held in the chuck. In other words, the inventors found that the distortion and deformation of the workpiece W1 when it is removed from the chuck after machining was a cause of the error.

[0090] Therefore, the simulation unit 112 simulates the shape of the machined workpiece W1 after it has been removed from the chuck (S213). In S213, the simulation unit 112 first reads the coordinate data of the side surface of the machined workpiece W1 from the simulation results in S212. Then, the simulation unit 112 simulates the shape of the machined workpiece W1 after it has been removed from the chuck using the inverse of the coordinates of the side surface of the machined workpiece W1. Specifically, the simulation unit 112 assumes that the coordinates of the side surface of the machined workpiece W1 after it has been removed from the chuck are the inverse of the coordinates of the side surface of the machined workpiece W1 while it is still held in the chuck. The simulation unit 112 also simulates the roundness of at least one of the outer and inner side surfaces of the machined workpiece W1 after it has been removed from the chuck.

[0091] Next, the modeling unit 113 models the shape of the workpiece W1 after it has been removed from the chuck (S214). In S214, the modeling unit 113 uses the simulation results from S213 to model the shape of the workpiece W1 after it has been removed from the chuck, so that any distortion or deformation of the workpiece W1 can be seen.

[0092] Next, the display control unit 114 displays a model of the machined workpiece W1 removed from the chuck on the display 150 (S215). In S215, the display control unit 114 displays the machined workpiece model MWM, which is the model of the machined workpiece W1 removed from the chuck and was modeled in S214, on the display 150.

[0093] Figure 15 shows an example of a post-machining workpiece model MWM displayed on display 150.

[0094] The deformation of the machined workpiece W1 after removal from the chuck ranges from a few micrometers to several hundred micrometers. Therefore, in the example shown in Figure 15, the machined workpiece model MWM is modeled at several thousand times its original size to show the deformation.

[0095] In the example shown in Figure 15, the post-machining workpiece model MWM is a model of the machined workpiece W1 after it has been removed from the chuck, with the surface perpendicular to the side facing forward. In the example shown in Figure 15, the post-machining workpiece model MWM has a shape resembling a three-leaf clover. The three outwardly protruding parts correspond to the parts that the chuck jaws were in contact with. By examining the post-machining workpiece model MWM, the operator can confirm the deformation of the workpiece W1 after it has been removed from the chuck.

[0096] Returning to the explanation of Figure 8, the display control unit 114 also displays information regarding the roundness of the machined workpiece W1 removed from the chuck on the display 150 (S216). In S216, the display control unit 114 displays information regarding the roundness of the side surface of the machined workpiece W1 removed from the chuck, which was simulated in S213, on the display 150. For example, the display control unit 114 displays numerical information regarding the roundness. Also, for example, the display control unit 114 displays information indicating whether the roundness is appropriate. Also, for example, the display control unit 114 displays information prompting the user to proceed with cutting according to the simulation results because the roundness is appropriate.

[0097] Returning to the explanation of Figure 2, the operator determines whether the roundness after machining is appropriate (S3). In S3, the operator determines whether the roundness of the side surface of the machined workpiece W1 is the desired roundness by checking the roundness information displayed on the display 150 in S216 of Figure 8.

[0098] If the roundness after machining is satisfactory in S3 (S3; YES), the operator performing the cutting process cuts the workpiece W1 according to the simulation results (S4). In S4, the operator cuts the workpiece W1 according to the simulation results so that the roundness of the side surface of the workpiece W1 after machining is the desired roundness. In particular, when performing the cutting process, the operator pays attention to chuck conditions such as chuck type, number of jaws, jaw width, curvature, holding force, and phase, according to the simulation results.

[0099] Figure 16 shows an example of measured values ​​for the roundness of the side surface of a workpiece W1 after machining according to the simulation results.

[0100] Figure 16 shows the measured values ​​of roundness obtained by measuring the side surface in the circumferential direction of the third measurement position MP3, with the angle of the third reference point O3 as viewed from axis AX shown in Figure 5 set to 0 degrees.

[0101] As mentioned earlier, the measured values ​​of roundness range from a few micrometers to several hundred micrometers. Therefore, differences in roundness in the circumferential direction are difficult to discern when displayed in actual size. For this reason, the roundness shown in Figure 16 is an enlargement of the measured values ​​by several thousand times.

[0102] As shown in the measured values ​​in Figure 16, the distribution of roundness on the side surface of the machined workpiece W1, which was cut according to the simulation results, closely resembles the shape of the machined workpiece model MWM. This indicates that the simulation performed by the cutting simulation device 100 is highly accurate.

[0103] Returning to the explanation of Figure 2, if the roundness after machining is not suitable in S3 (S3; NO), the operator performs a cutting simulation using an arbitrary roundness (S5). In S5, the operator inputs an arbitrary roundness instead of the measured value of the roundness of the workpiece W1 before machining. The parameter acquisition unit 111 acquires the arbitrary roundness input by the operator. Then, the simulation unit 112 simulates the roundness of the side surface of the workpiece W1 after machining using the arbitrary roundness. The operator repeats the simulation by changing the roundness setting until the roundness of the side surface of the workpiece W1 after machining becomes the desired roundness. That is, the operator determines that the workpiece W1 is suitable when the roundness of the side surface of the workpiece W1 after machining obtained by the simulation is the desired roundness.

[0104] If the simulation results in S5 show the desired degree of roundness, the designer of the workpiece W1 redesigns the workpiece W1 according to the simulation results (S6).

[0105] As described above, the cutting simulation device 100 of this embodiment is a device for simulating a cutting process. The cutting simulation device 100 includes a parameter acquisition unit 111 that acquires parameters related to a cylindrical workpiece W1 and parameters related to a chuck for holding the workpiece W1. The cutting simulation device 100 includes a simulation unit 112 that simulates the cutting process using the parameters acquired by the parameter acquisition unit 111. The parameter acquisition unit 111 acquires the measured value of the roundness of the side surface of the workpiece W1 before machining as a parameter related to the workpiece W1. The simulation unit 112 simulates the roundness of the side surface of the workpiece W1 after machining using the parameters related to the chuck and the measured value.

[0106] This cutting simulation device 100 can precisely predict the roundness of the side surface of the workpiece W1 after machining by incorporating measured values ​​of the roundness of the side surface of the workpiece W1 before machining into the simulation. This improves the accuracy between the simulation results and the actual machining results, allowing users to obtain more reliable simulation results as a basis for determining the optimal machining conditions. Ultimately, this is expected to improve machining accuracy and product quality.

[0107] The parameter acquisition unit 111 acquires measured values ​​obtained by measuring the roundness of the side surface of the workpiece W1 before machining at the measurement position in the axial direction AX. The simulation unit 112 uses the measured values ​​to simulate the shape of the entire side surface of the workpiece W1 before machining. The simulation unit 112 uses the parameters related to the chuck and the simulation results of the shape of the entire side surface of the workpiece W1 before machining to simulate the roundness of the side surface of the workpiece W1 after machining.

[0108] This cutting simulation device 100 enables simulations that accurately reflect the influence of roundness at the measurement position in the axis AX direction, allowing for a more accurate prediction of the roundness of the side surface of the workpiece W1 after machining. Ultimately, this is expected to improve machining accuracy.

[0109] The parameter acquisition unit 111 acquires, as measured values, a first measured value of roundness obtained by measuring the side surface of the first measurement position MP1 in the axis AX direction, and a second measured value of roundness obtained by measuring the side surface of the second measurement position MP2. The simulation unit 112 uses the first measured value to simulate the shape of the first circle C1 corresponding to the side surface of the first measurement position MP1. The simulation unit 112 uses the second measured value to simulate the shape of the second circle C2 corresponding to the side surface of the second measurement position MP2. The simulation unit 112 uses coordinates on the line connecting a point on the first circle C1 and a point on the second circle C2 to simulate the shape of the entire side surface of the workpiece W1 before machining.

[0110] This cutting simulation device 100 enables a three-dimensional simulation of the shape error of the entire workpiece W1, allowing for more precise prediction of the roundness of the entire side surface of the workpiece W1, not just the measurement area. Ultimately, this is expected to lead to further improvements in machining accuracy.

[0111] The parameter acquisition unit 111 acquires multiple types of parameters related to the chuck. The simulation unit 112 uses the multiple types of parameters and measured values ​​to simulate the roundness of the side surface of the workpiece W1 after machining.

[0112] This cutting simulation device 100 makes it possible to evaluate the influence of chuck characteristics on the roundness of the workpiece W1 after machining from multiple perspectives, and accurately predict the roundness of the side surface of the workpiece W1 after machining. In turn, it becomes possible to select the optimal machining conditions according to the chuck settings and conditions, which is expected to improve machining accuracy and product quality.

[0113] The simulation unit 112 uses the inverse of the coordinates of the side surface of the machined workpiece W1 held in the chuck to simulate the shape of the machined workpiece W1 after it has been removed from the chuck.

[0114] This cutting simulation device 100 can more accurately predict the shape of the workpiece W1 after it has been removed, taking into account the effects of holding it with a chuck. Consequently, it is possible to understand in advance any distortion or deformation of the shape that may occur after removal from the chuck, thereby further improving machining accuracy and ensuring high reliability in quality control of the final product.

[0115] The simulation unit 112 simulates the roundness of the side surface of the workpiece W1 after machining, using parameters related to the chuck and an arbitrary roundness of the side surface of the workpiece W1 before machining.

[0116] This cutting simulation device 100 enables simulations based on the user's desired roundness of the side surface of the workpiece W1 before machining. Consequently, it facilitates the optimization of machining conditions to meet specific requirements.

[0117] The cutting simulation method of the embodiment is a method for simulating a cutting process. The cutting simulation method includes obtaining parameters related to a cylindrical workpiece W1 and parameters related to a chuck for holding the workpiece W1. The cutting simulation method includes simulating the cutting process using the obtained parameters. As parameters related to the workpiece W1, the cutting simulation method obtains measured values ​​of roundness obtained by measuring the side surface of the workpiece W1 before machining. The cutting simulation method simulates the roundness of the side surface of the workpiece W1 after machining using the parameters related to the chuck and the measured values.

[0118] The machining simulation method enables precise simulation based on the roundness of the side surface of the workpiece W1 before machining. Consequently, it allows for a more accurate prediction of the roundness of the side surface of the workpiece W1 after machining, improving actual machining accuracy and enabling the setting of appropriate machining conditions based on the simulation results.

[0119] The cutting simulation program of this embodiment is a program that causes a computer to function as a cutting simulation device 100 that simulates the cutting process. The cutting simulation program causes the computer to function as a parameter acquisition unit 111 that acquires parameters related to a cylindrical workpiece W1 and parameters related to a chuck for holding the workpiece W1. The cutting simulation program causes the computer to function as a simulation unit 112 that simulates the cutting process using the parameters acquired by the parameter acquisition unit 111. The parameter acquisition unit 111 acquires measured values ​​of roundness obtained by measuring the side surface of the workpiece W1 before machining as parameters related to the workpiece W1. The simulation unit 112 uses the parameters related to the chuck and the measured values ​​to simulate the roundness of the side surface of the workpiece W1 after machining.

[0120] This machining simulation program can accurately simulate the roundness of the side surface of the workpiece W1 after machining. This, in turn, enables automation and improved accuracy of the simulation, allowing for optimization of the machining process during the design phase.

[0121] The cutting method of this embodiment is a method for cutting a cylindrical workpiece W1. The cutting method includes simulating the cutting process. The cutting method includes cutting the workpiece W1 using the simulation results. The simulation of the cutting process includes obtaining parameters related to the workpiece W1 and parameters related to the chuck for holding the workpiece W1. The simulation of the cutting process includes simulating the cutting process using the obtained parameters. The simulation of the cutting process obtains measured values ​​of roundness obtained by measuring the side surface of the workpiece W1 before processing as parameters related to the workpiece W1. The simulation of the cutting process simulates the roundness of the side surface of the workpiece W1 after processing using the parameters related to the chuck and the measured values. The cutting method cuts the workpiece W1 according to the simulation results so that the roundness of the side surface of the workpiece W1 after processing is the desired roundness.

[0122] This machining method improves machining accuracy by machining the workpiece W1 based on simulation results, thereby ensuring the desired roundness of the side surface of the machined workpiece W1. Ultimately, this is expected to improve product quality and streamline the machining process.

[0123] The workpiece determination method of the embodiment is a method for determining the suitability of a cylindrical workpiece W1 to be used for cutting. The workpiece determination method includes simulating the cutting process. The workpiece determination method includes determining the suitability of the workpiece W1 using the simulation results. The simulation of the cutting process includes obtaining parameters related to the workpiece W1 and parameters related to the chuck for holding the workpiece W1. The simulation of the cutting process includes simulating the cutting process using the obtained parameters. The simulation of the cutting process obtains measured values ​​of roundness obtained by measuring the side surface of the workpiece W1 before processing as parameters related to the workpiece W1. The simulation of the cutting process simulates the roundness of the side surface of the workpiece W1 after processing using the parameters related to the chuck and the measured values. The workpiece determination method determines that the workpiece W1 is suitable when the roundness of the side surface of the workpiece W1 after processing obtained by the simulation is the desired roundness.

[0124] This workpiece evaluation method allows for the determination of the suitability of workpiece W1 based on simulation results. Consequently, since the suitability of workpiece W1 can be confirmed before processing, the risk of processing defects due to an unsuitable workpiece W1 is reduced, and product quality assurance is strengthened.

[0125] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the embodiments. It will be obvious to those skilled in the art that various modifications or improvements can be made to the embodiments. It will also be clear from the claims that such modified or improved forms may be included within the technical scope of the present invention.

[0126] The execution order of operations, procedures, steps, and stages in the apparatus, program, and method described in the claims, specification, and drawings is not explicitly stated as "before," "prior to," etc. It should be noted that the execution order of each process can be implemented in any order, unless the output of a previous process is used in a later process. Even if the execution order of each process is described using terms such as "first," "next," etc., in relation to the operation flow in the claims, specification, and drawings for convenience, this does not mean that it is essential to perform them in that order. [Explanation of Symbols]

[0127] 100 Machining Simulation Device 110 CPU 111 Parameter acquisition unit 112 Simulation Department 113 Modeling Department 114 Display Control Unit 120 Main Memory 130 Input / Output Interfaces 140 Input devices 150 displays 160 storage AX axis C1 1st Circle C2 2nd Circle C3 3rd Circle CD Check Data CI1 First Circle Image CI2 Second Circle Image CI3 Third Circle Image CM Chuck Model DWM Deformed Work Model JM1 First Claw Model JM2 2nd Claw Model JM3 3rd Claw Model L1 1st straight line L2 2nd straight line MD Model Data MWM-machined workpiece model MP1 1st measurement position MP2 2nd measurement position MP3 3rd measurement position PL1 1st plane PL2 2nd plane PL3 3rd plane RP1 1st reference point RP2 2nd reference point RP3 3rd reference point SD Simulation Data W1 Work WD Work Data WM Work Model

Claims

1. A cutting process simulation device for simulating the cutting process, A parameter acquisition unit that acquires parameters related to a cylindrical workpiece and parameters related to a chuck for holding the workpiece, The system includes a simulation unit that simulates the cutting process using the parameters acquired by the parameter acquisition unit, The parameter acquisition unit acquires the measured value of the roundness of the side surface of the workpiece before processing as a parameter related to the workpiece. The simulation unit is a cutting simulation device that simulates the roundness of the side surface of the workpiece after machining using parameters related to the chuck and the measured values.

2. The parameter acquisition unit acquires the measured value obtained by measuring the roundness of the side surface at the measurement position in the axial direction of the workpiece before processing. The aforementioned simulation unit, Using the measured values, the overall shape of the side surface of the workpiece before processing is simulated. A cutting simulation device according to claim 1, which simulates the roundness of the side surface of the workpiece after machining using parameters relating to the chuck and simulation results of the shape of the entire side surface of the workpiece before machining.

3. The parameter acquisition unit acquires, as the measured values, a first measured value of roundness obtained by measuring the side surface of the first measurement position in the axial direction, and a second measured value of roundness obtained by measuring the side surface of the second measurement position. The aforementioned simulation unit, Using the first measured value, the shape of the first circle corresponding to the side of the first measurement position is simulated. Using the second measured value, the shape of the second circle corresponding to the side of the second measurement position is simulated. The cutting simulation apparatus according to claim 2, which simulates the shape of the entire side surface of the workpiece before machining using coordinates on a straight line connecting a point on the first circle and a point on the second circle.

4. The parameter acquisition unit acquires multiple types of parameters related to the chuck, The cutting simulation apparatus according to claim 1, wherein the simulation unit simulates the roundness of the side surface of the workpiece after processing using the multiple types of parameters and the measured values.

5. The aforementioned simulation unit, The cutting simulation apparatus according to claim 1, wherein the shape of the processed workpiece after it has been removed from the chuck is simulated using the inverse of the coordinates of the side surface of the processed workpiece held in the chuck.

6. The cutting simulation apparatus according to claim 1, wherein the simulation unit simulates the roundness of the side surface of the workpiece after machining using parameters relating to the chuck and an arbitrary roundness of the side surface of the workpiece before machining.

7. A machining simulation method for simulating the cutting process, To obtain parameters related to a cylindrical workpiece and parameters related to a chuck for holding the workpiece, This includes simulating the cutting process using the acquired parameters, As parameters related to the workpiece, the measured value of the roundness obtained by measuring the side surface of the workpiece before processing is acquired. A cutting simulation method for simulating the roundness of the side surface of the workpiece after machining, using the parameters related to the chuck and the measured values.

8. A cutting process simulation program that makes a computer function as a cutting process simulation device for simulating the cutting process, The aforementioned computer, A parameter acquisition unit that acquires parameters related to a cylindrical workpiece and parameters related to a chuck for holding the workpiece. The parameter acquisition unit uses the acquired parameters to function as a simulation unit that simulates the cutting process. The parameter acquisition unit acquires, as parameters related to the workpiece, the measured value of the roundness obtained by measuring the side surface of the workpiece before processing, The simulation unit is a cutting simulation program that simulates the roundness of the side surface of the workpiece after machining, using the parameters related to the chuck and the measured values.

9. A cutting method for cutting a cylindrical workpiece, Simulating the cutting process, This includes performing cutting operations on the workpiece using the simulation results, The simulation of the cutting process is To obtain parameters related to the workpiece and parameters related to the chuck for holding the workpiece, This includes simulating the cutting process using the acquired parameters, As parameters related to the workpiece, the measured value of the roundness obtained by measuring the side surface of the workpiece before processing is acquired. Using the parameters related to the chuck and the measured values, the roundness of the side surface of the workpiece after machining is simulated. A machining method comprising machining a workpiece according to a simulation result that determines whether the roundness of the side surface of the workpiece after machining is a desired roundness.

10. A workpiece determination method for determining the suitability of a cylindrical workpiece used in cutting processes, Simulating the cutting process, This includes determining whether the workpiece is suitable using the simulation results, The simulation of the cutting process is To obtain parameters related to the workpiece and parameters related to the chuck for holding the workpiece, This includes simulating the cutting process using the acquired parameters, As parameters related to the workpiece, the measured value of the roundness obtained by measuring the side surface of the workpiece before processing is acquired. Using the parameters related to the chuck and the measured values, the roundness of the side surface of the workpiece after machining is simulated. A workpiece determination method in which a workpiece is determined to be suitable when the roundness of the side surface of the workpiece after processing, obtained by simulation, is the desired roundness.

Images