Display device for machine tool

Abstract

A technology is provided that makes it possible to understand the severity of a problem caused by a reverse process during vibration processing in a machine tool. A display device 1 for a machine tool comprises: a processing state detection unit 11, which detects at least one frequency parameter and one amplitude parameter as processing states for performing vibration processing; a speed calculation unit 12, which, based on at least the frequency parameter and the amplitude parameter, calculates the minimum feed rate that represents the minimum among the speeds changed by the vibration process; and a display control unit 15, which displays an image on a display unit 20 based on the minimum feed rate.

Description

TECHNICAL AREA

[0001] The present invention relates to a display device for a machine tool. BACKGROUND OF THE TECHNOLOGY

[0002] A technique is known with which various parameters, such as feed rate and the like, can be displayed in order to determine the machining states for a machine tool that performs vibration machining in which a tool is oscillated in relation to a workpiece so that chips are crushed (for example, patent document 1). Citation list Patent specification

[0003] Patent specification 1: Japanese unexamined patent application, publication no. 2023-000009 DISCLOSURE OF THE INVENTION Problems to be solved by the invention

[0004] In vibration machining, the normal cutting motion is superimposed with a vibration motion, causing the feed rate to fluctuate constantly. If an operator cannot determine the maximum speed for the forward movement, they cannot select a suitable tool or set appropriate parameters for vibration machining. In this respect, the technology disclosed in Patent Document 1 displays the maximum speed for the vibration motion, allowing the operator to verify it.

[0005] If a backlash occurs during oscillation, the minimum speed becomes negative. This can lead to frictional wear, or the backlash can reduce positional accuracy and cause an impact. It is difficult to detect these backlash-related problems simply by displaying the maximum speed.

[0006] The present disclosure was developed taking into account the problems described above, and one objective of the present disclosure is to provide a technique that enables an operator to grasp the extent of a problem caused by a return movement during vibration machining by a machine tool. Means to solve the problems

[0007] The present disclosure provides a display device for a machine tool that performs vibration machining while a cutting tool and a workpiece vibrate relative to each other, the display device comprising: a machining state detection unit that detects at least one frequency parameter and one amplitude parameter as machining states for performing the vibration machining; a speed calculation unit that calculates a minimum feed rate, which is a minimum contained in a speed that changes due to the vibration motion, based on at least the frequency parameter and the amplitude parameter; and a display control unit that displays an image on a display unit based on the minimum feed rate. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a function block diagram representing a display device for a machine tool according to a first embodiment; Fig. 2 is a flowchart that represents an example of a process of display control carried out by the display device according to the first embodiment; Fig. Figure 3 is a diagram that shows an example of an image displayed by the display device on a display unit and shows a minimum feed rate and a maximum feed rate based on a vibration frequency and a vibration amplitude; Fig. Figure 4 is a diagram showing an example of an image displayed by the display device on the display unit and showing a minimum feed rate and a maximum feed rate based on a vibration frequency multiplication factor and a vibration amplitude multiplication factor; Fig. 5 is a flowchart that represents an example of a sequence of events of a display carried out by a display device according to a second embodiment; Fig. Figure 6 is a diagram that provides an example of an image displayed by the display device on a display unit, showing a vibration component velocity based on a vibration frequency and a vibration amplitude; and Fig. Figure 7 is a diagram that provides an example of an image displayed by the display device on the display unit, showing a vibration component velocity based on a vibration frequency multiplication factor and a vibration amplitude multiplication factor. PREFERRED METHOD FOR IMPLEMENTING THE INVENTION

[0008] The embodiments of this disclosure are described in detail with reference to the drawings. In the description of the second and subsequent embodiments, the same components as in the first embodiment are designated with the same reference numerals, and their description is omitted where appropriate. [First embodiment]

[0009] Fig. Figure 1 is a functional block diagram representing a display device 1 for a machine tool according to the first embodiment. The display device 1 according to the first embodiment is a computer that displays 20 different types of information about a machine tool performing vibration machining while a cutting tool and a workpiece exhibit relative vibration on a display unit. The display device 1 is used, for example, by being connected to a control device (not shown), which is a computer for controlling the machine tool.

[0010] The machine tool processes the workpiece with the cutting tool by operating at least one spindle, which rotates the cutting tool and the workpiece relative to each other, and at least one feed axis, which moves the cutting tool relative to the workpiece. The machine tool performs various types of machining based on machining programs.

[0011] The machine tool can perform an oscillating motion in which speeds, including forward speed, reverse speed, etc., are constantly switched.

[0012] Alternatively, the machine tool can perform an oscillating motion in which the speed changes in the form of a sine wave. The following description is based on the assumption that a control system is used for a machine tool whose speed changes in the form of a sine wave.

[0013] When machined by the machine tool according to the present embodiment, the workpiece can have any shape without restriction. In particular, the present invention is applicable to a case in which a workpiece has a conical section or an arcuate section on a surface to be machined and a plurality of feed axes (Z-axis and X-axis) are required, as well as to a case in which a workpiece has a solid cylindrical shape or a hollow cylindrical shape and one specific feed axis (Z-axis) is sufficient for machining.

[0014] A hardware configuration of the display device 1 for the machine tool is described. The display device 1 consists, for example, of a computer comprising a memory, such as read-only memory (ROM), random-access memory (RAM), and the like, a control processing unit (CPU), and a communication control unit, all interconnected via a bus. The display device 1 further includes a display unit 20, which displays various types of information, and an input unit 21, through which an operator enters various types of information. The display unit 20 consists, for example, of a display that shows various types of information. The input unit 21 is, for example, an operator interface such as a touch panel, a keyboard, or a button.

[0015] The display device 1 for a machine tool can be configured as a computer numerical control (CNC) or connected to a host computer (not shown) such as a CNC, a programmable logic controller (PLC), or the like. In addition to a machining program, the host computer can input machining states such as spindle speed and the like into the display device 1 for the machine tool.

[0016] Next, the functional units implemented in the display device 1 are described. The display device 1 contains, as functional units, a processing state detection unit 11, a speed calculation unit 12, and a display control unit 15. The functional units of the display device 1 are implemented through the interaction of the CPU, the memory, and a control program stored in memory.

[0017] The machining state acquisition unit 11 is a machining state acquisition function for acquiring machining states for carrying out vibration machining. For example, the machining states can be entered into the display unit 1 by an operator via the input unit 21 or an external computer according to the information displayed on the display unit 20 of the display unit 1, or they can be automatically acquired from a machining program, a setting parameter of the machine tool, or the like.

[0018] The machining states contain information required for machining, such as spindle speed (rpm), feed rate (mm / revolution) per spindle revolution, workpiece diameter (mm), feed axis command position, and vibration states. The feed rate (mm / revolution) per spindle revolution can be calculated from a combination of the spindle speed (rpm) and the cutting tool feed rate (mm / min).

[0019] Next, the vibration states contained in the machining states are described. For the unambiguous specification of a vibration waveform, the vibration states include at least one frequency parameter, which contains information about the vibration frequency of the cutting tool or the workpiece, and one amplitude parameter, which contains information about the vibration amplitude of the cutting tool or the workpiece. The frequency parameter can be a vibration frequency per relative rotation of the cutting tool and the workpiece, or a vibration frequency per unit of time. Alternatively, the frequency parameter can be a cycle parameter of the forward / reverse motion. The amplitude parameter can be information regarding a vibration amplitude in relation to a feed rate per relative rotation of the cutting tool and the workpiece, or a distance parameter of the forward / reverse motion.The cycle parameter and the distance parameter of the forward / reverse movement can be determined from a forward speed, a reverse speed, a forward movement distance, a reverse movement distance, a spindle speed, a control cycle, and the like. The frequency parameter and the amplitude parameter can be determined from the spindle speed, a feed rate per revolution, a feed rate per minute, a frequency multiplication factor (which is a vibration frequency per relative revolution of the cutting tool and workpiece), an amplitude multiplication factor (which is a vibration amplitude in relation to a feed rate per relative revolution of the cutting tool and workpiece), and the like.

[0020] In the present embodiment, a vibration frequency f (Hz) per spindle revolution and a vibration frequency multiplication factor I (times) are used as parameters of the frequency. The vibration frequency multiplication factor I (times) can be specified directly or calculated from a vibration frequency (Hz) and a spindle revolution rate S (1 / min) after specifying the vibration frequency (Hz).

[0021] The amplitude parameters used are a vibration amplitude A (mm) in relation to the quantity of feed per spindle revolution and a vibration amplitude multiplication factor K (times), which indicates the magnitude of a vibration amplitude. The vibration amplitude multiplication factor K (times) can also be specified directly.

[0022] The speed calculation unit 12 is a speed calculation function that calculates the feed rate of the feed axis during vibration based on the machining states. The speed calculation unit 12 calculates the feed rate using at least the frequency parameter and the amplitude parameter contained in the machining states.

[0023] The speed calculation unit 12 according to the present embodiment calculates a speed that changes due to the oscillatory motion, based on at least the frequency parameter and the amplitude parameter. In this example, the speed calculated by the speed calculation unit 12 is an actual speed of a movement, for example, a speed in the case of a superposition of the oscillatory motion with a constant feed. Furthermore, the speed that changes due to the oscillatory motion includes a minimum speed and a maximum speed, which lie within a calculated speed range.

[0024] The display control unit 15 is a display control function for showing various types of information relating to the display device 1, as well as information about the result of an operator input on the display unit 20. The display control unit 15 performs a display to show an image on the display unit 20 based on the minimum feed rate calculated by the speed calculation unit 12. The display control unit 15 can also perform a display to show the maximum feed rate calculated by the speed calculation unit 12 together with the minimum feed rate on the display unit 20.

[0025] Next, a sequence of a display control process will be described with reference to Fig. 2 described. Fig. Figure 2 is a flowchart illustrating an example of the sequence of a display control process performed by the display device 1 according to the first embodiment. The sequence and content of the process steps shown in the flowchart are merely examples and can be modified as appropriate.

[0026] First, the machining state acquisition unit 11 records the machining states from an operator input, parameters of a machining program, or parameters of the machine tool (step S11). The machining states recorded by the machining state acquisition unit 11 include, for example, a feed rate F (mm / rev), which indicates a feed quantity, and a spindle speed S (min -1), an oscillation frequency f (Hz) or an oscillation frequency multiplication factor I (times) as a frequency parameter, an oscillation amplitude A (mm) or an oscillation amplitude multiplication factor K (times) as an oscillation parameter and the like.

[0027] Next, the speed calculation unit 12 calculates a minimum feed rate and a maximum feed rate based on the machining states detected by the machining state detection unit 11 (step S12). In this example, the speed calculation unit 12 calculates the minimum feed rate and the maximum feed rate based on the frequency parameter and the amplitude parameter contained in the machining states.

[0028] An example is described in which the speed calculation unit 12 calculates the feed rates using the vibration frequency f (Hz) as the frequency parameter and the vibration amplitude A (mm) as the amplitude parameter. In this case, the speed calculation unit 12 calculates the minimum feed rate according to the following equation (1) and the maximum feed rate according to the following equation (2). FS-60πAF[mm / min] FS+60πAF[mm / min]

[0029] Another example, in which the speed calculation unit 12 calculates the feed rates using the frequency multiplication factor I (times) as the frequency parameter and the vibration amplitude multiplication factor K (times) as the amplitude parameter, is now described. In this case, the speed calculation unit 12 calculates the minimum feed rate according to the following equation (3) and the maximum feed rate according to the following equation (4). FS-FKISπ[mm / min] FS+FKISπ[mm / min]

[0030] Next, the display control unit 15 performs a display control to show an image on the display unit 20 containing the minimum and maximum feed rates calculated by the speed calculation unit 12 (step S13). In the present embodiment, the display control unit 15 displays the minimum and maximum feed rates on the same display screen of the display unit 20.

[0031] The images displayed by the display control unit 15 on the display unit 20 are shown with reference to the Fig. 3 and Fig. 4 described.

[0032] Fig. Figure 3 is a diagram that illustrates an example of the image displayed by the display device 1 on the display unit 20, showing the minimum and maximum feed rates based on the oscillation frequency f and the oscillation amplitude A. The in Fig. The image shown contains a processing status indicator field 51, a vibration status indicator field 52 and a processing status indicator field 53.

[0033] In the machining status display field 51, the feed rate F and the spindle speed S are displayed as values ​​indicating the machining states. In the vibration status display field 52, the vibration frequency f and the vibration amplitude A are displayed as values ​​indicating the vibration states encompassed by the machining states. In the machining status display field 53, the minimum feed rate F, calculated according to equation (1) by the speed calculation unit 12, and the maximum feed rate F, calculated according to equation (2) by the speed calculation unit 12, are displayed.

[0034] Fig. Figure 4 is a diagram that represents an example of an image displayed by the display device 1 on the display unit, showing the minimum and maximum feed rates based on the frequency multiplication factor I and the vibration amplitude multiplication factor K. The diagram in Fig. The image to be displayed contains a processing state indicator field 61, a vibration state indicator field 62 and a processing status indicator field 63, which provide a comprehensive impression of the processing states and the vibration state.

[0035] In the machining state display field 61, the feed rate F, representing the feed quantity, and the spindle speed S are displayed as values ​​indicating the machining states. In the vibration state display field 62, the vibration frequency multiplication factor I and the vibration amplitude multiplication factor K are displayed as values ​​indicating the vibration conditions present in the machining states. In the machining state display field 63, the minimum feed rate F, calculated according to equation (3) by the speed calculation unit 12, and the maximum feed rate F, calculated according to equation (4) by the speed calculation unit 12, are displayed.

[0036] The display device 1 for a machine tool according to the first embodiment, which performs a vibration machining operation while a cutting tool and a workpiece vibrate relative to each other, has the following effects.

[0037] The display device 1 for a machine tool according to the present embodiment comprises: the machining state detection unit 11, which detects at least one frequency parameter and one amplitude parameter as machining states for carrying out the vibration machining; the speed calculation unit 12, which calculates a minimum feed rate, which represents the minimum of a speed that changes due to the vibration motion, based on at least the frequency parameter and the amplitude parameter; and the display control unit 15, which displays an image on the display unit 20 based on the minimum feed rate.

[0038] Because of this feature, the minimum feed rate, which relates to the degree of a problem caused by the return movement or the like, is automatically calculated based on the machining conditions and displayed on display unit 20.

[0039] This allows the operator to easily assess the degree of the problem caused by the reverse movement.

[0040] Furthermore, in the present embodiment, the speed calculation unit 12 also calculates a maximum feed rate, which represents the maximum of the speed change due to the oscillating motion, based on at least the frequency parameter and the amplitude parameter, and the display control unit 15 displays the minimum and maximum feed rates on the same display unit 20. Because of this function, in which the maximum feed rate is automatically calculated and displayed in addition to the minimum feed rate, the operator can easily perceive the fluctuation range (rough transitions) of the speed during oscillating machining. There are cases in which a recommended feed rate is specified for each tool or workpiece.Since the present embodiment allows the operator to detect the range of speed fluctuations, the operator can easily check whether the transition of the feed speed is within the recommended range. [Second embodiment]

[0041] Next, a display device 1 according to a second embodiment is described, which performs a different display control than the display device 1 according to the first embodiment. The display device 1 of the second embodiment has a similar configuration to the first embodiment. The second embodiment differs from the first embodiment in that a speed calculation unit 12 of the second embodiment calculates a minimum feed rate as the vibration component rate.

[0042] Fig. Figure 5 is a flowchart illustrating an example of a display control process performed by the display device according to the second embodiment. In the second embodiment, a machining state detection unit 11 detects vibration states from an operator input, parameters of a machining program, or parameters of a machine tool (step S21). The vibration states detected by the machining state detection unit 11 include, for example, a vibration frequency f (Hz) or a vibration frequency multiplication factor I (times) as a frequency parameter, a vibration amplitude A (mm) or a vibration amplitude multiplication factor K (times) as a vibration parameter, and the like.In the case of recording the frequency multiplication factor I (times) and the vibration amplitude multiplication factor K (times) as vibration states, the machining state detection unit 11 also records a feed rate F (mm / revolution) as a reference feed rate and a spindle speed S (min. -1 ).

[0043] Next, the speed calculation unit 12 calculates the vibration component velocity based on the vibration states detected by the machining state detection unit 11 (step S22). For example, in a case where a machine tool controlled by the display unit 1 performs a cutting operation that includes vibration in a mode where a vibration component is superimposed on a constant feed, the speed calculation unit 12 calculates the velocity of the vibration component itself, which is to be superimposed, as the vibration component velocity. In this example, the speed calculation unit 12 calculates the vibration component velocity based on the frequency parameter and the amplitude parameter contained in the vibration states.

[0044] An example is described in which the speed calculation unit 12 calculates the vibration component velocity using the vibration frequency f (Hz) as the frequency parameter and the vibration amplitude A (mm) as the amplitude parameter. In this example, the speed calculation unit 12 calculates the absolute value of a maximum vibration component velocity contained within the absolute value of a rotational speed that changes due to the vibrational motion, according to the following equation (5). In the present embodiment, due to the use of a configuration in which the rotational speed oscillates in a sinusoidal waveform, the maximum positive value and the maximum negative value of the vibration component velocity have the same absolute value.Even in a configuration where the vibration component velocity fluctuates in a triangular waveform, the present embodiment is also applicable if the maximum positive value and the maximum negative value contained in a vibration component velocity that changes due to the oscillating motion have the same absolute value. 60πAF[mm / min]

[0045] Next, another example is described where the speed calculation unit 12 calculates the vibration component velocity using the frequency multiplication factor I (times) as the frequency parameter and the vibration amplitude multiplication factor K (times) as the amplitude parameter. In this case, the speed calculation unit 12 calculates the absolute value of a maximum vibration component velocity contained in the absolute value of a rotational speed that changes due to the oscillatory motion according to the following equation (6) and calculates a maximum feed rate according to equation (6). FKISπ[mm / min]

[0046] Next, a display control unit 15 performs a display control to show an image on the display unit 20 containing the vibration component velocity calculated by the speed calculation unit 12 (step S23). In the present embodiment, the display control unit 15 displays the absolute value of the vibration component velocity on the same display screen of the display unit 20.

[0047] The images displayed by the display control unit 15 on the display unit 20 are shown with reference to the Fig. 6 and Fig. 7 described.

[0048] Fig. Figure 6 is a diagram that illustrates an example of the image displayed by the display device 1 on a display unit 20, showing a vibration component velocity based on the vibration frequency f and the vibration amplitude A. The in Fig. Figure 6 shows a vibration state display field 72 and a machining state display field 73. The vibration state display field 72 shows the vibration frequency f and the vibration amplitude A, indicating the vibration states. The machining state display field 73 shows the vibration component velocity, which is calculated according to equation (5) using the rotational speed calculation unit 12.

[0049] Fig. Figure 7 is a diagram that illustrates an example of the image displayed by the display device 1 on the display unit 20, showing a vibration component velocity based on the frequency multiplication factor and the vibration amplitude multiplication factor. The in Fig. Image 7 shows a processing status indicator field 81, a vibration status indicator field 82 and a processing status indicator field 83.

[0050] In the machining state display field 81, the feed rate F, which is also a reference feed rate, and the spindle speed S are displayed as values ​​indicating the machining states. In the vibration state display field 82, the vibration frequency multiplication factor I and the vibration amplitude multiplication factor K are displayed as values ​​indicating the vibration states contained in the machining states. In the machining state display field 63, the vibration component velocity is displayed as an absolute value, calculated according to equation (6) using the speed calculation unit 12.

[0051] As described above, in the second embodiment, the speed calculation unit 12 calculates the minimum feed rate as the vibration component rate (e.g., the vibration rate in the processing status display field 73, which is shown in Fig. 6 is shown, or the vibration velocity in the processing status display field 83, which is in Fig. (as shown in Figure 7), where the component of a reference feed velocity, which is constant and serves as a reference for the vibration motion, is excluded. This function allows the operator to more accurately assess the extent of a problem caused by the return motion or similar due to the vibration component velocity.

[0052] In the second embodiment, the display control unit 15 shows the vibration component velocity as an absolute value. If the minimum and maximum velocities are equal, this function allows the velocity fluctuation range between the maximum and minimum values ​​to be expressed solely by displaying the absolute value. This reduces the display costs compared to a case where both the minimum and maximum feed velocities are displayed.

[0053] Furthermore, in the second embodiment, the machining state detection unit 11 detects a reference feed rate that is constant and serves as a reference for the oscillating motion, and the display control unit 15 shows the oscillation component velocity and the reference feed rate (e.g., the feed rate in the machining state display field 81, which is shown in Fig.(as shown in Figure 7) on the same display unit 20. This function allows the operator to easily grasp not only the maximum and minimum speeds of the actual movement based on both the vibration component speed and the reference feed speed, but also to capture in more detail the rotational speed fluctuation range during vibration machining and the degree of any problem caused by the return movement, while reducing display costs.

[0054] It should be noted that the method for calculating the vibration component velocity is not limited to the method according to the embodiment above. In a case where the machine tool controlled by the display device 1 performs cutting by means of vibrations by controlling an actual forward speed and an actual reverse speed, the speed calculation unit 12 can calculate a constant reference feed speed, which serves as a reference, from an average value of the sum of the forward speed and the reverse speed, and calculate the vibration component velocity by subtracting the constant reference feed speed.

[0055] Furthermore, in the second embodiment, the vibration component velocity is displayed in the form of an absolute value, but the present invention is not limited to this configuration. For example, the vibration component velocity can be displayed as the minimum feed rate, or the vibration component velocity with a positive or negative sign can be displayed as the minimum feed rate or as the maximum feed rate.

[0056] In the second embodiment, the example described shows the vibration component velocity as minimum feed rate and maximum feed rate, but it can also display a value that changes in real time according to the actual vibration processing.

[0057] It should be noted that the present disclosure is not limited to the embodiments and variants described above, but that modifications and improvements within a range in which the objective of the present disclosure can be achieved are included in the present disclosure.

[0058] The following section also discloses remarks on the above embodiments and their variants. (Additional Note 1)

[0059] A display device (1) for a machine tool that performs vibration machining while a cutting tool and a workpiece are vibrated relative to each other, the display device (1) comprising: a processing state detection unit (11) which detects at least one frequency parameter and one amplitude parameter as processing states for carrying out vibration processing; a speed calculation unit (12) which, based on at least the frequency parameter and the amplitude parameter, calculates a minimum feed rate that represents a minimum contained in a speed that changes due to the oscillatory motion; and a display control unit (15) which displays an image on a display unit (20) based on the minimum feed rate. (Additional Note 2)

[0060] In the display device (1) The speed calculation unit (12) further calculates a maximum feed rate, which is a maximum contained in the speed and changes due to the oscillatory motion, based on at least the frequency parameter and the amplitude parameter, and The display control unit (15) displays the minimum feed rate and the maximum feed rate on the same display unit (20). (Additional Note 3)

[0061] In the display device (1) The speed calculation unit (12) calculates the minimum feed velocity as the vibration component velocity, excluding a component of a reference feed velocity that is constant and serves as a reference for the vibration motion. (Additional note 4)

[0062] In the display device (1) The display control unit (15) shows the vibration component velocity in the form of an absolute value. (Additional note 5)

[0063] In the display device (1) The processing state detection unit (11) detects the constant reference feed rate, which serves as a reference for the oscillating motion, and The display control unit (15) displays the vibration component velocity and the reference feed velocity on the same display unit (20). (Additional Note 6)

[0064] A display device (1) for a machine tool performing vibration machining while a cutting tool and a workpiece are vibrated relative to each other by superimposing a vibration command for sinusoidal vibration or a vibration command for triangular vibration at a constant feed rate, wherein the minimum feed rate and the maximum feed rate, which are contained in a changing rotational speed, are equal, the display device (1) comprising: a processing state detection unit (11) which detects at least one frequency parameter and one amplitude parameter as processing states for carrying out vibration processing; a speed calculation unit (12) that calculates a maximum absolute speed value, which is a maximum contained in an absolute value of a speed that changes and relates to the vibration command, based on at least the frequency parameter and the amplitude parameter; and a display control unit (15) which displays an image on a display unit based on the maximum absolute value rotational speed. (Additional note 7)

[0065] In the display device (1) according to additional note 6 The processing state detection unit (11) detects a reference feed rate that is constant and serves as a reference for the oscillating motion, and The display control unit (15) displays a vibration component velocity without a component of the reference feed velocity and the reference feed velocity on the display unit (20). EXPLANATION OF THE REFERENCE SYMBOLS 1 Display device for machine tool 11 Processing status recording unit 12 Speed ​​calculation unit 15 Display control unit 20 display units QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2023-000009

[0003]

Claims

A display device for a machine tool that performs vibration machining while a cutting tool and a workpiece oscillate relative to each other, the display device comprising: a machining state detection unit that detects at least one frequency parameter and one amplitude parameter as machining states for performing the vibration machining; a speed calculation unit that calculates a minimum feed rate, which is a minimum contained in a speed that changes due to the vibration motion, based on at least the frequency parameter and the amplitude parameter; and a display control unit that displays an image on a display unit based on the minimum feed rate. The display device according to claim 1, wherein the speed calculation unit further calculates a maximum feed rate, which is a maximum contained in the speed that changes due to the oscillatory motion, based on at least the frequency parameter and the amplitude parameter, and the display control unit displays the minimum feed rate and the maximum feed rate on the display unit. The display device according to claim 1 or 2, wherein the speed calculation unit calculates the minimum feed rate as the vibration component rate, excluding a component of a reference feed rate which is constant and serves as a reference for the vibration motion. The display device according to claim 3, wherein the display control unit displays the vibration component velocity in the form of an absolute value. The display device according to claim 3 or 4, wherein the processing state detection unit detects the constant reference feed rate which serves as a reference for the oscillating motion, and the display control unit displays the oscillation component rate and the reference feed rate on the display unit. A display device for a machine tool that performs vibration machining while a cutting tool and a workpiece oscillate relative to each other by superimposing, at a constant feed rate, a vibration command for a sinusoidal oscillation or a vibration command for a triangular oscillation in which the minimum feed rate and the maximum feed rate, contained in a changing rotational speed, are equal, the display device comprising: a machining state detection unit that detects at least one frequency parameter and one amplitude parameter as machining states for performing the vibration machining;a speed calculation unit that calculates a maximum absolute speed, which is a maximum contained in an absolute value of a speed that changes and relates to the vibration command, based on at least the frequency parameter and the amplitude parameter; and a display control unit that displays an image on a display unit based on the maximum absolute speed. The display device according to claim 6, wherein the processing state detection unit detects a reference feed rate which is constant and serves as a reference for the oscillating motion, and the display control unit displays an oscillation component rate without a component of the reference feed rate and the reference feed rate on the display unit.

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