WO2023058112A1 - Computing device and computing method - Google Patents

Abstract

A computing device (14) comprises: a first balance information acquiring unit (52) for acquiring first balance information (I1) relating to a rotating body (16); a second balance information acquiring unit (54) for acquiring second balance information (I2) relating to the rotating body (16) with a temporary weight (30temp) attached; and a first information generating unit (58) for generating correcting weight information (Ifix) including a weight (wx) of a correcting weight (30fix) and an attachment position (γx) thereof, on the basis of the first balance information (II), the second balance information (I2), and temporary weight information (Itemp) relating to the temporary weight (30temp).

Description

Arithmetic device and method

The present invention relates to an arithmetic device and an arithmetic method that perform arithmetic operations based on information acquired from machine tools.

A field balancer is described in JP-A-03-251066. A field balancer is a device for measuring the balance state of a rotationally driven object to be measured.

A machine tool is equipped with a rotating body that is driven to rotate. The rotating body is, for example, a face plate. Here, if the rotating body is in a poorly balanced state, there is a greater possibility that the machine tool will fail in machining. Therefore, the operator of the machine tool performs work for balancing the rotating body. In the work, the operator attaches a weight for balance adjustment to the rotating body. Thereby, the balance state of the rotating body is adjusted.

However, if the mounting position of the weight and the weight of the weight are each inappropriate, the balance of the rotating body will not be improved. Therefore, the operator must repeat trial and error until the rotating body is balanced.

An object of the present invention is to solve the above-described problems.

A first aspect of the present invention corrects the balance state of the rotating body of a machine tool comprising a rotating body that rotates about a rotating shaft and a moving body that moves along a movement axis perpendicular to the rotating shaft. A calculation device for calculating the weight and mounting position of a correcting weight attached to the rotating body for the purpose of A first balance information acquisition unit that acquires first balance information including the rotation angle of the rotating body when it becomes, and the rotation to which the temporary weight is further attached after acquiring the first balance information A second balance information acquisition unit for acquiring second balance information including the maximum value of the positional deviation when the body is rotated and the rotation angle of the rotating body when the positional deviation reaches the maximum value. a temporary weight information acquisition unit that acquires temporary weight information including the weight of the temporary weight and the mounting position of the temporary weight with respect to the rotating body; the first balance information, the second balance information, and the temporary weight and a first information generator for generating correction weight information including the weight of the correction weight for correcting the balance state of the rotating body and the mounting position of the correction weight based on the weight information.

A second aspect of the present invention corrects the balance state of the rotating body of a machine tool including a rotating body that rotates around a rotating shaft and a moving body that moves along a movement axis perpendicular to the rotating shaft. A calculation method for calculating the weight and mounting position of a correction weight to be attached to the rotating body in order to first balance information acquisition for acquiring first balance information including a maximum positional deviation of the moving body when it is rotated and a rotation angle of the rotating body when the positional deviation reaches the maximum value a step of attaching a temporary weight to the rotating body after the first balance information acquiring step; and a second balance measuring step of rotating the rotating body after the step of attaching the temporary weight; a maximum value of the positional deviation when the rotating body to which the temporary weight is attached is rotated by the second balance measurement step; and a rotation angle of the rotating body when the positional deviation reaches the maximum value. a second balance information acquisition step of acquiring second balance information including a temporary weight information acquisition step of acquiring temporary weight information including the weight of the temporary weight and the mounting position of the temporary weight with respect to the rotating body; and correcting weight information including the weight of a correcting weight for correcting the balance state of the rotating body and the mounting position of the correcting weight based on the first balance information, the second balance information, and the temporary weight information. and a first information generating step of generating.

According to each aspect of the present invention, the burden on the operator in the work of correcting the balance of the rotating body provided in the machine tool is reduced.

FIG. 1 is a configuration diagram of an arithmetic system according to an embodiment. FIG. 2 is an explanatory diagram of the rotating body and the first motor. FIG. 3A is a first schematic diagram for explaining rotation angle detection by the first detector. FIG. 3B is a second schematic diagram for explaining rotation angle detection by the first detector. FIG. 4 is a schematic configuration diagram of the arithmetic device of the embodiment. FIG. 5 is a graph exemplifying the phase of the rotation angle of the rotating body acquired by the rotation angle acquisition unit. FIG. 6 is a graph exemplifying the phase of the positional deviation of the moving object acquired by the positional deviation acquiring unit. FIG. 7 is a graph illustrating a correspondence relationship between a plurality of rotation angles acquired by a rotation angle acquisition unit and position deviations corresponding to each of the plurality of rotation angles acquired by the rotation angle acquisition unit. FIG. 8 is a flow chart illustrating the flow of the computation method of the embodiment. FIG. 9 is a schematic configuration diagram of an arithmetic unit according to Modification 1. As shown in FIG. FIG. 10 is a schematic diagram for explaining the positional relationship between each of the two weight mounting portions and the mounting position of the correction weight. 11A and 11B are diagrams for explaining the generation of two pieces of decomposed correction weight information by the second information generation unit. FIG. FIG. 12 is a schematic diagram for explaining the angular difference. FIG. 13 is a schematic configuration diagram of an arithmetic unit according to Modification 4. As shown in FIG.

[Embodiment]
FIG. 1 is a configuration diagram of an arithmetic system 10 of the embodiment.

In FIG. 1, not only the computing system 10 but also the X-axis and the Y-axis are illustrated. The X-axis and the Y-axis are directional axes perpendicular to each other. The X-axis is the directional axis parallel to the horizontal plane. Also, the Y-axis is a directional axis parallel to the direction of gravity. For each of the X and Y axes, one direction along the axis is represented by a "+". Also, the opposite direction to that direction is represented by "-". For example, a direction toward one side along the X-axis is represented as "+X direction." Also, the direction opposite to the +X direction is expressed as "-X direction".

The arithmetic system 10 includes a machine tool 12 and an arithmetic device 14 (see FIG. 1).

The machine tool 12 is an industrial machine that processes the workpiece W based on instructions. The machine tool 12 is, for example, an ultra-precision machine. The command resolution of ultra-precision machines is 10 nanometers or less. The machine tool 12 includes a rotating body 16 , a first motor 18 , a moving body 20 and a second motor 22 .

FIG. 2 is an explanatory diagram of the rotating body 16 and the first motor 18. FIG.

The Z-axis is illustrated in FIG. The Z-axis is a directional axis perpendicular to each of the X-axis and the Y-axis. The Z-axis is the horizontal directional axis.

The rotating body 16 is, for example, a face plate or a chuck that supports the workpiece W. As shown in FIG. The shape of the rotating body 16 in the XY plane view is circular. The rotating body 16 has a rotation axis (rotational axis) _A16 . The axis of rotation A ₁₆ is parallel to the Z-axis. The rotor 16 is rotatable around a rotation axis _A16 . An arrow D _R in FIG. 2 indicates the direction of rotation of the rotor 16 .

The rotating body 16 has a plurality of weight mounting portions 32 . Each of the plurality of weight mounting portions 32 detachably holds the weight 30 . A plurality of weight mounting portions 32 are provided on the side surface of the rotating body 16 (peripheral surface in XY plan view). A certain interval is provided between the weight mounting portions 32 adjacent to each other. The plurality of weight mounting portions 32 have the same depth as screw holes.

The weight 30 is, for example, a screw (set screw). In this case, each of the plurality of weight mounting portions 32 is a screw hole. That is, the weight 30 is attached to the rotor 16 by being inserted into the weight attachment portion 32 . Further, the weight 30 is removed from the rotating body 16 by being extracted from the weight mounting portion 32 . The balance state of the rotating body 16 is changed by attaching and detaching the weight 30 to and from the rotating body 16 . The insertion depth of the weight 30 inserted into the weight mounting portion 32 is determined in advance.

The operator attaches and detaches the weight 30 to and from the weight mounting portion 32 . However, the robot may attach and detach the weight 30 to and from the weight mounting portion 32 .

The first motor 18 is an actuator that rotates the rotating body 16 . The first motor 18 has a shaft 18a. The shaft 18 a rotates according to the power supplied to the first motor 18 . The shaft 18 a is connected to the rotor 16 . Thereby, the rotating body 16 rotates integrally with the shaft 18a. Note that the first motor 18 is, for example, a spindle motor.

The moving body 20 is a member that supports the rotating body 16 . The moving body 20 is movable along a movement axis. Therefore, the rotating body 16 can move integrally with the moving body 20 . The axis of movement is the directional axis orthogonal to the axis of rotation _A16 . The axis of movement in this embodiment is the X-axis. However, the movement axis may be the Y-axis.

The second motor 22 is an actuator that moves the moving body 20 . The second motor 22 is, for example, a linear motor. Linear motors are preferable because they generate less vibration when driven. However, the second motor 22 may be a servomotor. When the second motor 22 is a servomotor, the machine tool 12 further comprises a screw shaft and a nut. The screw shaft is installed parallel to the movement axis. Moreover, the screw shaft rotates according to the driving of the second motor 22 . The nut is screwed onto the screw shaft. The nut is connected to the mobile body 20 . As a result, the moving body 20 linearly moves according to the rotational force of the second motor 22 . In this case, the amount of rotation of the second motor 22 and the amount of movement of the moving body 20 are correlated.

The machine tool 12 further includes a first detector 24, a second detector 26, and a controller 28 (see FIG. 1). A second detector 26 is a sensor for detecting the amount of movement of the moving body 20 .

The first detector 24 is a sensor for detecting the rotation angle RA of the rotor 16 . The first detector 24 is, for example, a rotary encoder. The first detector 24 is installed at a different position from the rotor 16 on a plane parallel to the XY plane. In the following, the position at which the first detector 24 is installed is also described as installation position P ₂₄ .

The installation position _P24 is preferably located on an extension of the straight line _LX . The reason will be described later. The straight line _LX is an imaginary straight line passing through the rotation axis _A16 . The straight line _LX is parallel to the movement axis.

In this embodiment, the installation position P ₂₄ is in the +X direction with respect to the rotor 16 . However, the installation position P ₂₄ may be in the −X direction from the rotating body 16 .

FIG. 3A is a first schematic diagram for explaining detection of the rotation angle RA by the first detector 24. FIG.

The body of revolution 16 has an origin P _org (see FIG. 3A). The origin P _org is the reference point of the rotation angle RA (the point indicating zero degrees). That is, when the rotating body 16 rotates, the origin P _org moves along the rotation direction _DR . The moving origin P _org passes through the installation position P ₂₄ in the direction of rotation D _R . When the origin P _org reaches the installation position P ₂₄ in the rotation direction D _R , the first detector 24 outputs a detection signal indicating zero degrees as the rotation angle RA.

FIG. 3B is a second schematic diagram for explaining detection of the rotation angle RA by the first detector 24. FIG.

FIG. 3B shows the case where the body of rotation 16 is rotated by α degrees along the direction of rotation D _R after the origin P _org passes through the installation position P ₂₄ . In this case, the first detector 24 outputs a detection signal indicating α degrees as the rotation angle RA.

Note that in this embodiment, the rotation of the rotating body 16 and the rotation of the shaft 18a are integrated. Therefore, the first detector 24 may output a detection signal corresponding to the rotation angle of the shaft 18a. In this case, the first detector 24 may be attached to the first motor 18 .

The output signal of the first detector 24 is input to the control device 28.

The second detector 26 outputs a detection signal according to the position of the moving body 20 in the movement axis direction. The second detector 26 is, for example, a linear scale. However, the second detector 26 is not limited to a linear scale. For example, if the second motor 22 is a servomotor, the second detector 26 may be a rotary encoder. This is because the amount of rotation of the second motor (servo motor) 22 and the amount of movement of the moving body 20 are correlated as described above. In this case, the second detector 26 outputs a detection signal corresponding to the rotation angle of the shaft of the second motor 22 .

A detection signal from the second detector 26 is input to the control device 28 . In the following description, unless otherwise specified, the position of the moving body 20 indicates the position of the moving body 20 in the movement axis direction.

The control device 28 is an electronic device (computer) that controls the rotation of the rotating body 16 and the movement control of the moving body 20 . The controller 28 is, for example, a numerical controller (CNC: Computerized Numerical Controller). Controller 28 includes a processor and memory. The memory of controller 28 stores a predetermined program for controlling machine tool 12 . A processor of the control device 28 controls the machine tool 12 by executing a predetermined program. Neither the processor of the control device 28 nor the memory of the control device 28 are shown.

The control device 28 controls the first motor 18 in controlling the rotation of the rotating body 16 . The control of the first motor 18 is performed based on the rotation angle RA of the rotor 16 . Therefore, the control device 28 calculates the rotation angle RA based on the detection signal of the first detector 24 . The control device 28 controls the first motor 18 based on the calculated rotation angle RA.

In the movement control of the moving body 20, the control device 28 feedback-controls the second motor 22. Feedback control of the second motor 22 is performed based on the position of the moving body 20 . Therefore, based on the detection signal of the second detector 26, the control device 28 calculates the actual position (hereinafter referred to as detection position) of the moving body 20 in the movement axis direction. The control device 28 feedback-controls the second motor 22 based on the calculated position of the moving body 20 .

Movement control of the moving body 20 includes position adjustment control of the moving body 20 based on the position deviation PD. The position deviation PD is the deviation between the position of the moving body 20 based on the command (command position) and the calculated detected position. Therefore, the control device 28 calculates the position deviation PD based on the commanded position and the calculated detected position. Also, the control device 28 controls the second motor 22 based on the positional deviation PD. As a result, the deviation between the commanded position and the actual position of the moving body 20 is corrected. Note that the positional deviation PD is generated according to vibration of the machine tool 12, for example. Vibration of the machine tool 12 is generated according to the rotation of the rotating body 16, for example. In particular, the rotating body 16 tends to generate the above-described vibration when it rotates in an unbalanced state. The unbalanced state of the rotating body 16 is a state in which the position of the center of gravity of the rotating body 16 is deviated from the rotation axis _A16 in at least one of the X direction and the Y direction. In this case, the position of the center of gravity of the rotating body 16 moves along the rotation direction _DR as the rotating body 16 rotates, like the origin P _org described above.

The explanation about the configuration example of the machine tool 12 is above. However, the configuration of the machine tool 12 is not limited to the above. For example, the weight mounting portion 32 may be provided on the surface of the rotor 16 facing the +Z direction or the surface of the rotor 16 facing the −Z direction. Also, the actuator that rotates the rotating body 16 may include an air turbine. The actuators that move the moving body 20 may include fluid bearings.

FIG. 4 is a schematic configuration diagram of the computing device 14 of the embodiment.

Based on the explanation of the machine tool 12, the calculation device 14 will be explained below. Computing device 14 is an electronic device. The computing device 14 can obtain information from the control device 28 . For example, computing device 14 can communicate with controller 28 . The calculation device 14 includes a display section 34, an operation section 36, a storage section 38, and a calculation section 40 (see FIG. 4).

The display unit 34 is a display device having a display screen. Information is appropriately displayed on the display screen of the display unit 34 . The material of the display screen of the display unit 34 includes, for example, liquid crystal or OEL (Organic Electro-Luminescence).

The operation unit 36 is an input device that receives information input. The operator can input information (instructions) to the computing device 14 via the operation unit 36 . The operation unit 36 has, for example, an operation panel. However, the operation unit 36 is not limited to the operation panel. For example, the operation unit 36 may appropriately have a keyboard, mouse, or touch panel. The touch panel is installed, for example, on the display screen of the display unit 34 .

The storage unit 38 is a storage device that stores information. The storage unit 38 has one or more memories. For example, the storage unit 38 appropriately has a RAM (Random Access Memory) and a ROM (Read Only Memory).

The storage unit 38 stores the calculation program 42 . The calculation program 42 is a program for causing the calculation device 14 to execute the calculation method of the present embodiment. Information stored in the storage unit 38 is not limited to the arithmetic program 42 . The storage unit 38 appropriately stores various information as needed.

The computing unit 40 is a processing device (one or more processors) that processes information. The calculation unit 40 appropriately includes, for example, a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit). The calculation unit 40 can appropriately refer to the storage unit 38 .

The calculation unit 40 includes a command output unit 44, a rotation angle acquisition unit 46, a position deviation acquisition unit 48, a balance measurement unit 50, a first balance information acquisition unit 52, and a second balance information acquisition unit 54. , a virtual weight information acquisition unit 56 and an information generation unit 58 (see FIG. 4). These units ( 44 , 46 , 48 , 50 , 52 , 54 , 56 , 58 ) are implemented by the operation unit 40 executing the operation program 42 .

The command output unit 44 issues a command to the machine tool 12 (control device 28). This command includes contents to stop the moving body 20 at a predetermined position while rotating the rotating body 16 .

The rotating body 16 rotates based on the command from the command output unit 44 . Here, the rotation angle acquisition unit 46 acquires a plurality of rotation angles RA. A plurality of rotation angles RA are obtained from the controller 28 . However, the rotation angle acquisition unit 46 may acquire the detection signal of the first detector 24 . In that case, the rotation angle acquisition section 46 may calculate the rotation angle RA based on the detection signal of the first detector 24 .

It is preferable that the acquisition period of the rotation angle RA be as short as possible. For example, an acquisition cycle in which the rotation angle RA is acquired in units of 1 degree (0 degrees, 1 degree, 2 degrees, . , 0.2 degrees, . . . , 359.9 degrees), the latter is preferable. When the rotation angle RA is acquired at a short period, the balance state of the rotor 16 can be accurately measured. However, the acquisition cycle of the rotation angle RA is determined according to the detection cycle of the first detector 24 and the resolution of the first detector 24 .

FIG. 5 is a graph exemplifying the phase of the rotation angle RA of the rotating body 16 acquired by the rotation angle acquisition unit 46. As shown in FIG.

The graph of FIG. 5 has a vertical axis indicating rotation angle RA and a horizontal axis indicating time. The graph of FIG. 5 shows multiple rotation angles RA plotted along a time series. For example, the rotation angle RA of the rotor 16 at time _t1 is "θ". The graph in FIG. 5 can be created based on the results of obtaining a plurality of rotation angles RA by the rotation angle obtaining unit 46. FIG. Note that the range of the vertical axis in FIG. 5 is 0 degrees to 360 degrees. However, the range of the vertical axis in FIG. 5 is not limited to 0 degrees to 360 degrees. For example, the vertical axis of FIG. 5 may include a rotation angle RA of 361 degrees or more.

The rotating body 16 generates vibration by rotating. This vibration propagates to the moving body 20 . Therefore, the moving body 20 deviates from the predetermined position based on the command from the command output unit 44 according to the vibration of the rotating body 16 . As a result, a position deviation PD occurs between the position of the moving body 20 and a predetermined position. As the rotating body 16 continues to rotate, multiple position deviations PD occur. Here, the position deviation acquisition unit 48 acquires a plurality of position deviations PD.

A plurality of position deviations PD are obtained from the controller 28 . However, the position deviation acquisition section 48 may calculate the position deviation PD based on the command from the control device 28 and the detection signal from the second detector 26 .

Each of the plurality of positional deviations PD includes many components corresponding to the vibration of the rotating body 16. The vibration of the rotating body 16 changes according to the balance state of the rotating body 16 . In other words, changes in the balance state of the rotating body 16 are strongly reflected in the plurality of positional deviations PD.

The acquisition cycle of the position deviation PD by the position deviation acquisition unit 48 and the acquisition cycle of the rotation angle RA by the rotation angle acquisition unit 46 are preferably synchronized. In this case, the correspondence between the rotation angle RA and the positional deviation PD (described later) is achieved with high accuracy. However, the acquisition cycle of the position deviation PD and the acquisition cycle of the rotation angle RA may be different from each other.

FIG. 6 is a graph exemplifying the phase of the position deviation PD of the moving body 20 acquired by the position deviation acquisition unit 48. FIG.

The graph of FIG. 6 has a vertical axis representing position deviation PD and a horizontal axis representing time. The graph of FIG. 6 shows a plurality of positional deviations PD plotted along time series. For example, the position deviation PD at time _t1 is "-r". Time _t1 in FIG. 6 and time _t1 in FIG. 5 are the same time. The graph in FIG. 6 can be created based on the acquisition results of a plurality of positional deviations PD by the positional deviation acquisition unit 48. FIG.

In addition, in FIG. 6, plus and minus of the positional deviation PD indicate the direction of positional deviation (the same applies to FIG. 7). For example, a positive positional deviation PD in FIG. 6 indicates the positional deviation PD caused by the moving body 20 deviating from the commanded position in the −X direction. In FIG. 6, the negative positional deviation PD indicates the positional deviation PD caused by the moving body 20 deviating from the command position in the +X direction.

The balance measurement unit 50 associates the rotation angle RA with the positional deviation PD. Thereby, the balance measuring section 50 measures the balance state of the rotating body 16 . Here, each of the plurality of rotation angles RA is associated with the corresponding positional deviation PD on the time axis. For example, the rotation angle RA=θ in FIG. 5 is obtained at time _t1 . The position deviation PD=-r in FIG. 6 is also acquired at time _t1 . In this case, the balance measuring unit 50 associates the rotation angle RA=θ with the positional deviation PD=−r.

However, there are cases where the acquisition cycle of the position deviation PD by the position deviation acquisition unit 48 and the acquisition cycle of the rotation angle RA by the rotation angle acquisition unit 46 are not synchronized. In this case, there may be no set of rotation angle RA and position deviation PD that are obtained at the same time. In this case, the balance measurement unit 50 may associate the rotation angle RA and the position deviation PD that are acquired close to each other on the time axis. Alternatively, the balance measurement unit 50 may associate the rotation angle RA with the interpolated position deviation PD by interpolating the position deviation PD. This interpolation is performed, for example, based on linear interpolation (linear interpolation). If it is difficult to synchronize the acquisition cycle of the rotation angle RA and the acquisition cycle of the position deviation PD, it is preferable to make the acquisition cycle of the position deviation PD as short as possible than the acquisition cycle of the rotation angle RA. The reason is that the rotation angle RA can be more easily interpolated between the rotation angle RA of the rotating body 16 rotating at the commanded speed and the position deviation PD of the moving body 20 vibrating unstably. That is, it is because it is easy to improve the accuracy of interpolation.

Also, there is a time difference between the time when the rotating body 16 vibrates and the time when the vibration propagates to the moving body 20 . That is, the balance state of the rotor 16 is the balance state at the time when the rotor 16 vibrates. On the other hand, the position deviation PD reflecting the balance state is observed after the time when the rotating body 16 vibrates. Ideally, the rotation angle RA and the positional deviation PD are associated with each other in consideration of the time difference. However, in order to simplify the explanation as much as possible, the time difference is ignored in this embodiment.

FIG. 7 is a graph illustrating a correspondence relationship between a plurality of rotation angles RA acquired by the rotation angle acquisition unit 46 and position deviations PD corresponding to each of the plurality of rotation angles RA acquired by the rotation angle acquisition unit 46. .

The graph in FIG. 7 has a vertical axis indicating the positional deviation PD and a horizontal axis indicating the rotation angle RA. The range of the horizontal axis in FIG. 7 is 0 degrees to 360 degrees. That is, the range of the horizontal axis in FIG. 7 is one rotation of the rotor 16 . However, the horizontal axis of FIG. 7 may include a rotation angle RA of 361 degrees or more.

In the graph of FIG. 7, the positional deviation PD representing the largest positional deviation of the moving body 20 is [-r]. The position deviation PD=-r corresponds to the rotation angle RA=θ. That is, the positional deviation PD in the +X direction is the largest when the rotation angle RA=θ. The reason is that when the rotation angle RA=θ, the position of the center of gravity of the rotor 16 (described above) is on the straight line _LX and in the +X direction from the rotation axis A ₁₆ . Here, the rotational position indicating the position of the center of gravity of the rotating body 16 is hereinafter also referred to as the "unbalanced position". Also, the minus sign of the positional deviation PD=-r indicates that the moving body 20 has deviated from the commanded position in the +X direction.

Based on the above, when the rotation angle RA=θ, the unbalanced position is on the straight line _LX and reaches in the +X direction from the rotation axis _A16 . Here, conventionally, a field balancer has been used to check the unbalanced position. However, according to the present embodiment, the unbalance position is identified based on the correspondence relationship (graph in FIG. 7) between multiple rotation angles RA and multiple position deviations PD. That is, the arithmetic device 14 measures the balance state of the rotor 16 based on the rotation angle RA and the positional deviation PD. Therefore, no field balancer is required in this embodiment.

Also, the first detector 24 of the present embodiment is installed on the straight line _LX and in the +X direction from the rotation axis _A16 . In this case, the "rotational angle RA corresponding to the maximum value of the positional deviation PD in the +X direction" and the "rotational angle RA at which the unbalanced position reaches the installation position _P24 in the rotational direction _DR " match. This allows the operator to more easily grasp the unbalanced position.

The first balance information acquisition unit 52 acquires the first balance information _I1 . The first balance information _I1 is information including the maximum value _r0 and the rotation angle _θ0 . Here, the maximum value _r0 indicates the maximum value of the positional deviation PD when the rotating body 16 is rotated. The rotation angle θ ₀ indicates the rotation angle RA corresponding to the maximum value r ₀ on the time axis.

The first balance information _I1 is obtained based on the measurement result of the balance state of the rotor 16 . The acquired first balance information _I1 is stored in the storage unit 38 .

The second balance information acquisition unit 54 acquires the second balance information _I2 . The second balance information _I2 is information including the maximum value _r1 and the rotation angle _θ1 . Here, the maximum value _r1 indicates the maximum value of the positional deviation PD when the rotor 16 on which the temporary weight 30 _temp is mounted is rotated. Temporary weight 30 _temp indicates weight 30 with weight _w1 . The temporary weight 30 _temp is attached to one of the plurality of weight attachment portions 32 . The temporary weight 30 _temp is attached to the rotating body 16 after the first balance information _I1 is acquired by the first balance information acquisition unit 52 . The rotation angle _θ1 indicates the rotation angle RA corresponding to the maximum value _r1 on the time axis.

The second balance information _I2 is acquired based on the measurement result of the balance state of the rotating body 16 to which the temporary weight 30 _temp is attached. The acquired second balance information _I2 is stored in the storage unit 38 .

The provisional weight information acquisition unit 56 acquires provisional weight information I _temp . The temporary weight information I _temp is information including the weight w ₁ and the mounting position γ ₁ of the temporary weight 30 _temp . The temporary weight information I _temp is input to the arithmetic unit 14 via the operation unit 36, for example. The obtained temporary weight information I _temp is stored in the storage unit 38 .

The mounting position _γ1 is represented by the rotation angle RA. That is, the mounting position γ ₁ indicates that the temporary weight 30 _temp is mounted at a position of the rotation angle RA=γ ₁ along the rotation direction _DR in the rotor 16 .

The information generation unit 58 generates corrected spindle information I _fix . The correction weight information I _fix is information including the weight w _x of the correction weight 30 _fix and the mounting position γ _x of the correction weight 30 _fix . Here, the correction weight 30 _fix is the weight 30 for correcting the balance state of the rotor 16 . The mounting position γ _x indicates the position of the rotating body 16 at the rotation angle RA=γ _x along the rotation direction _DR . The weight w _x and the mounting position γ _x are calculated by the information generator 58 .

The information generator 58 calculates the weight _wx based on the following formula (1). The values indicated by each character in the formula (1) are as follows. That is, "r ₀ : the maximum value of the positional deviation PD indicated by the first balance information I ₁ ". "r ₁ : the maximum value of the positional deviation PD indicated by the second balance information I ₂ ". It is "θ ₀ : rotation angle RA indicated by the first balance information I ₁ ". "θ ₁ : rotation angle RA indicated by the second balance information I ₂ ". It is "w ₁ : the weight of the temporary weight 30 _temp indicated by the temporary weight information I _temp ".

 

The information generator 58 calculates the mounting position γ _x based on the following formula (2). The values indicated by each character in the formula (2) are as follows. That is, "r ₀ : the maximum value of the positional deviation PD indicated by the first balance information I ₁ ". "r ₁ : the maximum value of the positional deviation PD indicated by the second balance information I ₂ ". It is "θ ₀ : rotation angle RA indicated by the first balance information I ₁ ". "θ ₁ : rotation angle RA indicated by the second balance information I ₂ ". It is "γ ₁ : attachment position of temporary weight 30 _temp indicated by temporary weight information I _temp ". It is "w' _x : content of absolute value symbol in formula (1) [see formula (1)]".

 

The corrected weight information I _fix is stored in the storage unit 38 . Also, the corrected weight information I _fix is shown to the operator via the display unit 34 . The operator attaches a correction weight 30 _fix of weight w _x to the attachment position γ _x of the rotating body 16 . Thereby, the balance state of the rotating body 16 is preferably corrected.

The configuration example of the arithmetic unit 14 of the present embodiment is as above.

FIG. 8 is a flowchart illustrating the flow of the calculation method of the embodiment.

The calculation method of FIG. 8 is executed by the calculation device 14. The calculation method of FIG. 8 includes a first balance measurement step S1, a first balance information acquisition step S2, and a temporary weight attachment step S3. 8 includes a second balance measurement step S4, a second balance information acquisition step S5, a temporary weight information acquisition step S6, and an information generation step (first information generation step) S7. Including further.

In the first balance measurement step S1, the balance measurement unit 50 measures the balance state of the rotating body 16. More specifically, the first balance measurement step S1 includes a first command output step S11, a first rotation angle acquisition step S12, a first position deviation acquisition step S13, and a first association step S14. including.

In the first command output step S11, the command output unit 44 issues a command to the machine tool 12. Thereby, the rotating body 16 rotates. Also, the movement of the moving body 20 is restricted.

In the first rotation angle acquisition step S12, the rotation angle acquisition unit 46 acquires the rotation angle RA. Here, the rotation angle acquisition unit 46 acquires a plurality of rotation angles RA. A plurality of rotation angles RA are acquired in the range of 0 degrees to 360 degrees, for example.

In the first positional deviation obtaining step S13, the positional deviation obtaining unit 48 obtains the positional deviation PD. Acquisition of a plurality of rotation angles RA by the rotation angle acquisition unit 46 (S12) and acquisition of a plurality of position deviations PD by the position deviation acquisition unit 48 (S13) may be performed in parallel.

In the first association step S14, the balance measurement unit 50 associates the rotation angle RA and the position deviation PD on the time axis. Thereby, the balance state of the rotating body 16 is measured.

In the first balance information acquisition step S2, the first balance information acquisition unit 52 acquires the first balance information _I1 .

In the temporary weight attaching step S3, the rotating body 16 is attached with the temporary weight 30 _temp . Note that the temporary weight attachment step S3 may be performed before the first balance information acquisition step S2 as long as it is after the first association step S14. The rotating body 16 may temporarily stop during execution of the temporary weight attaching step S3.

In the second balance measurement step S4, the balance measurement unit 50 measures the balance state of the rotating body 16. The second balance measurement step S4 includes a second command output step S41, a second rotation angle acquisition step S42, a second position deviation acquisition step S43, and a second association step S44.

The second command output step S41 to second association step S44 are executed in the same flow as the first command output step S11 to first association step S14. However, the second command output step S41 to the second association step S44 are executed with the temporary weight 30 _temp attached to the rotating body 16 .

In the second balance information acquisition step S5, the second balance information acquisition unit 54 acquires the second balance information _I2 .

In the provisional weight information acquisition step S6, the provisional weight information acquisition unit 56 acquires the provisional weight information I _temp . Note that the temporary weight information acquisition step S6 is executed before the information generation step S7. As far as this is concerned, the execution timing of the temporary weight information acquisition step S6 is not limited to that shown in FIG.

In the information generating step S7, the information generating section 58 generates corrected weight information I _fix . The corrected weight information I _fix is generated based on the first balance information _I1 , the second balance information _I2 , and the temporary weight information I _temp .

The above is the description of the configuration example of the calculation method of the present embodiment.

As described above, according to the present embodiment, the arithmetic device 14 and the arithmetic method that reduce the burden on the operator in the work of correcting the balance of the rotating body 16 provided in the machine tool 12 are provided.

[Modification]
Modifications of the above embodiment will be described below. However, explanations overlapping with the above embodiment will be omitted as much as possible in the following explanation. Unless otherwise specified, the reference numerals of the components already explained in the above embodiments are used from the above embodiments.

(Modification 1)
The balance state of the rotating body 16 is corrected by mounting a correction weight 30 _fix at the mounting position γ _x . However, the position of the weight mounting portion 32 and the mounting position γ _x do not necessarily match. Therefore, there may be a case where the correction weight 30 _fix cannot be attached to the attachment position γ _x . Also, the operator may not have the correction weight 30 _fix of weight _wx . In this case, it is difficult for the operator to correct the balance state of the rotating body 16 . Based on the above, the arithmetic device 14 (14A) of this modified example will be described.

FIG. 9 is a schematic configuration diagram of an arithmetic unit 14A of Modification 1. FIG.

The computing device 14A includes the components of the computing device 14 of the embodiment (see FIG. 4). Arithmetic device 14A further includes a second information generator 60 , an instruction receiver 62 , and a table 64 .

The table 64 stores the position of each of the multiple weight mounting portions 32 . The position of each of the plurality of weight mounting portions 32 is represented by a rotation angle RA along the rotation direction _DR with respect to the origin _Porg . For example, the position of a certain weight mounting portion 32 is expressed as rotation angle RA=α. In this case, the position of the weight mounting portion 32 is the position of the rotation angle RA=α along the rotation direction _DR from the origin _Porg . The table 64 is referred to by the second information generator 60 as appropriate.

FIG. 10 is a schematic diagram for explaining the positional relationship between each of the two weight mounting portions 32A and 32B and the mounting position γ _x of the correction weight 30 _fix .

The instruction receiving unit 62 receives an operator's instruction operation. This instruction operation includes designation of two of the plurality of weight mounting portions 32 . In the following, one of the two designated weight mounting portions 32 is also referred to as weight mounting portion 32A. The other of the designated two weight mounting portions 32 is also described as a weight mounting portion 32B. The weight mounting portion 32A and the weight mounting portion 32B sandwich an imaginary straight line _Lγ (FIG. 10). The imaginary straight line L _γ is an imaginary straight line passing through the mounting position γ _x and the rotation axis A ₁₆ .

The second information generation unit 60 decomposes the corrected weight information I _fix to generate two pieces of decomposed corrected weight information I' _fix (I' _fix A, I' _fix B) (second information generation step ). The resolved corrected weight information I' _fix A is information including a position γ ₂ and a weight w ₂ . Here, the position _γ2 indicates the position of the weight mounting portion 32A. The weight _w2 indicates the weight of the correction weight 30 _fix A attached to the weight mounting portion 32A. Further, the resolved corrected weight information I' _fix B is information including the position _γ3 and the weight _w3 . Here, the position _γ3 indicates the position of the weight mounting portion 32B. The weight w ₃ indicates the weight of the correction weight 30 _fix B attached to the weight mounting portion 32B.

Each of position γ ₂ and position γ ₃ is specified based on the contents of table 64 . Weight w ₂ and weight w ₃ are calculated by the second information generator 60 . A method of calculating the weight _w2 and the weight _w3 will be described below.

11A and 11B are diagrams for explaining the generation of the two pieces of decomposed correction weight information I′ _fix by the second information generation unit 60. FIG.

FIG. 11 illustrates vector U _x (w _x , γ _x ), vector U ₂ (w ₂ , γ ₂ ), and vector U ₃ (w ₃ , γ ₃ ). A vector U _x (w _x , γ _x ) expresses the corrected weight information I _fix by a vector. The vector U _x (w _x , γ _x ) includes a component representing the weight w _x and a component representing the mounting position γ _x .

A vector U ₂ (w ₂ , γ ₂ ) expresses the decomposed corrected weight information I′ _fix A as a vector. Vector U ₂ (w ₂ , γ ₂ ) includes a component representing weight w ₂ and a component representing position γ ₂ .

A vector U ₃ (w ₃ , γ ₃ ) expresses the resolved corrected weight information I′ _fix B in a vector. Vector U ₃ (w ₃ , γ ₃ ) includes a component representing weight w ₃ and a component representing position γ ₃ .

Vector U ₂ (w ₂ , γ ₂ ) and vector U ₃ (w ₃ , γ ₃ ) are obtained by vector decomposition of vector U _x (w _x , γ _x ). That is, weight w ₂ and weight w ₃ are obtained by vector decomposition of vector U _x (w _x , γ _x ). In the following, vector decomposition is also simply described as decomposition.

Weight w ₂ and weight w ₃ are calculated based on the following equations (3) to (7). Note that the absolute value of the difference between γ ₂ and γ ₃ is not 0 degrees in Equations (3) to (7). In addition, in Equations (3) to (7), the absolute value of the difference between _γ2 and _γ3 is not even 180 degrees.

When γ ₂ =0 degrees, the weight w ₂ is obtained based on the following formula (3).

 

When γ ₂ =0 degrees, the weight w ₃ is obtained based on the following equation (4).

 

When γ ₂ =180 degrees, the weight w ₂ is obtained based on the following formula (5).

 

When γ ₂ =180 degrees, the weight w ₃ is obtained based on the above-described formula (4).

If γ ₂ is neither 0 degrees nor 180 degrees, the weight w ₂ is obtained based on the following equation (6). Note that the weight _w3 in the formula (6) is obtained based on the formula (7) described later.

 

If γ ₂ is not 0 degrees and is not 180 degrees, the weight w ₃ is obtained based on the following equation (7).

 

The two pieces of resolved corrected weight information I' _fix are stored in the storage unit 38 . Further, the resolved correction weight information I' _fix is displayed to the operator via the display section 34. FIG.

The operator mounts the correction weight 30 _fix A on the weight mounting portion 32A. Also, the operator mounts the correction weight 30 _fix B on the weight mounting portion 32B. As a result, the balance state of the rotating body 16 is corrected in the same manner as when the correction weight 30 _fix is attached to the mounting position γ _x . Therefore, the balance state of the rotating body 16 is preferably corrected.

Note that the calculation unit 40 (CPU) may automatically select at least one of the weight mounting portion 32A and the weight mounting portion 32B. Also, the second information generator 60 may further decompose at least one of the vector U ₂ (w ₂ , γ ₂ ) and the vector U ₃ (w ₃ , γ ₃ ). In this case, three or more pieces of decomposed correction weight information I' _fix are generated. Also, the second information generation unit 60 may use the temporary weight information I _temp as one of the two or more pieces of decomposed correction weight information I' _fix . In this case, the second information generator 60 uses, for example, the vector U ₂ (w ₂ , γ ₂ ) as a vector whose components are the weight w ₁ of the temporary weight 30 _temp and the mounting position γ ₁ . That is, w ₂ =w ₁ and γ ₂ =γ ₁ for vector U ₂ (w ₂ , γ ₂ ). In this case, the second information generating unit 60 generates vector U ₂ (w ₁ , γ ₁ ), vector U _x (w _x , γ _x ), and based on equations (3) to (7), vector Calculate U ₃ (w ₃ , γ ₃ ). Accordingly, the operator can correct the balance state of the rotating body 16 by further attaching the correction weight 30 _fix B to the rotating body 16 to which the temporary weight 30 _temp is attached. In other words, the operation of attaching and detaching the correction weight 30 _fix A is substantially omitted. As a result, the operator's burden is further reduced.

(Modification 2)
Computing device 14 may reside in controller 28 .

(Modification 3)
The computing device 14 of the embodiment includes a command output section 44 , a rotation angle acquisition section 46 , a position deviation acquisition section 48 and a balance measurement section 50 . The configuration of the arithmetic unit 14 is not limited to this. For example, an electronic device (balance measuring device) including the command output unit 44, the rotation angle acquisition unit 46, the position deviation acquisition unit 48, and the balance measurement unit 50 may be configured. This balance measuring device is an electronic device separate from the computing device 14 .

In this case, the command output unit 44, the rotation angle acquisition unit 46, the position deviation acquisition unit 48, and the balance measurement unit 50 may be omitted from the computing device 14.

In this case, the first balance information acquiring section 52 acquires the first balance information _I1 from the balance measuring device. Also, the second balance information acquiring unit 54 acquires the second balance information _I2 from the balance measuring device.

(Modification 4)
In this modified example, the “angle difference AD” will be explained. Also, based on that description, the arithmetic device 14 (14B) will be described.

The angular difference AD indicates the magnitude of positional deviation between the predetermined position _P24pre and the actual installation position _P'24 . The predetermined position P _24pre is the installation position (P ₂₄ ) of the first detector 24 described in the embodiment. That is, the predetermined position P _24pre indicates a position on the straight line _LX and in the +X direction from the rotating body 16 . On the other hand, the actual installation position P' ₂₄ indicates the actual installation position of the first detector 24 in this modified example. That is, the first detector 24 that should be installed at the predetermined position P _24pre may be installed at a position different from the predetermined position P _24pre . As a result, an angular difference AD occurs. The angular difference AD is represented by an angle (rotational angle RA) along the rotational direction _DR .

FIG. 12 is a schematic diagram for explaining the angle difference AD.

A specific example of the angle difference AD is shown in FIG. In the example of FIG. 12, the actual installation position _P'24 is a position shifted by "-β" degrees from the predetermined position _P24pre along the rotational direction _DR . In this case, the angle difference AD=-β.

The balance measurement of the rotating body 16 described in the embodiment produces an error according to the angular difference AD. For example, in the example of FIG. 7, an angular difference AD=-β may occur. In this case, the rotation angle θ+β is associated with the positional deviation −r. As a result, the mounting position γ _x is shifted by the angular difference AD=-β. In this case, even if the correction weight 30 _fix is mounted at the mounting position γ _x , the balance state of the rotating body 16 is not properly corrected. Based on the above description, the arithmetic unit 14B will be described below.

FIG. 13 is a schematic configuration diagram of an arithmetic device 14B of Modification 4. FIG.

The computing device 14B includes the components of the computing device 14 of the embodiment (see FIG. 4). Further, the calculation device 14B further includes a correction section 66 .

The correction unit 66 corrects the mounting position γ _x (correction weight information I _fix ) based on the angle difference AD. For example, when the angle difference AD=-β, the correction unit 66 corrects the angle indicating the mounting position γ _x by "-β" degrees. This corrects the deviation of the mounting position _γx caused by the angular difference AD. Note that the angle difference AD is stored in advance in the storage unit 38 (see FIG. 13).

It should be noted that the present invention is not limited to the above-described embodiments and modifications, and can take various configurations without departing from the gist of the present invention.

[Invention obtained from the embodiment]
Inventions that can be grasped from the above embodiments and modifications will be described below.

<First invention>
The rotating body of a machine tool (12) comprising a rotating body (16) rotating around a rotating axis (A ₁₆ ) and a moving body (20) moving along a moving axis orthogonal to the rotating axis A calculation device (14, 14A) for calculating the weight (w _x ) and mounting position (γ _x ) of a correction weight (30 _fix ) attached to the rotating body to correct the balance state, and rotating the rotating body A first balance including the maximum value (r ₀ ) of the positional deviation (PD) of the moving body when the positional deviation reaches the maximum value (r 0 ) and the rotation angle (θ ₀ ) of the rotating body when the positional deviation becomes the maximum value A first balance information acquisition unit (52) that acquires information (I ₁ ), and after acquiring the first balance information, the rotating body to which the temporary weight (30 _temp ) is further attached is rotated. a second balance information (I ₂ ) including the maximum value (r ₁ ) of the positional deviation and the rotation angle (θ ₁ ) of the rotating body when the positional deviation reaches the maximum value; a balance information acquisition unit (54) of and temporary weight information for acquiring temporary weight information (I _temp ) including the weight (w ₁ ) of the temporary weight and the mounting position (γ ₁ ) of the temporary weight with respect to the rotating body an acquisition unit (56), and a weight (w _x ) of a correction weight (30 _fix ) for correcting the balance state of the rotating body based on the first balance information, the second balance information and the temporary weight information and a first information generator (58) for generating correction weight information (I _fix ) including the mounting position (γ _x ) of the correction weight.

As a result, an arithmetic device is provided that reduces the burden on the operator in the work of correcting the balance of the rotating body provided in the machine tool.

The first information generation unit may calculate the weight of the correction weight based on formula (1), and calculate the mounting position of the correction weight based on formula (2). Thereby, the first information generator can calculate the corrected weight information.

A plurality of weight mounting portions (32) for mounting the correction weights are provided in advance on the rotating body, and the computing device includes a table (64) storing the positions of the plurality of weight mounting portions, By decomposing the correction weight information using the table, the positions of two or more weight mounting portions among the plurality of weight mounting portions and the correction weights attached to each of the two or more weight mounting portions and a second information generator (60) for generating two or more pieces of resolved corrected weight information (I' _fix ) including the weight of . Thereby, the operator can suitably correct the balance state of the rotating body based on two or more pieces of resolved correction weight information.

The computing device may further include an instruction receiving section (62) that receives an operator's instruction operation for designating the two or more weight mounting sections. This allows the operator to designate two or more weight mounting portions to which the correction weights are to be mounted.

The second information generation unit generates the resolved corrected weight information by decomposing a vector (U _x ) whose components are the weight of the corrected weight indicated by the corrected weight information and the mounting position of the corrected weight. may be generated. Thereby, the operator can appropriately correct the balance state of the rotating body based on the disassembled correction weight information.

The second information generator may use the provisional weight information as one of the two or more pieces of the decomposed correction weight information. This makes it possible to substantially omit the work of attaching and detaching one of the plurality of correction weights (30 _fix ).

The computing device includes a rotation angle acquisition unit (46) for acquiring the rotation angle, a position deviation acquisition unit (48) for acquiring the position deviation, and a plurality of the rotation angles and corresponding to each of the plurality of rotation angles. and a balance measuring unit (50) that associates the positional deviation with the positional deviation, wherein the first balance information acquiring unit and the second balance information acquiring unit measure the rotation angle and the positional deviation obtained by the balance measuring unit. You may acquire said 1st balance information and said 2nd balance information based on matching with. Thereby, the computing device also serves as a balance measuring device. Moreover, in the balance measurement, there is no need for a field balancer in which an acceleration sensor separate from the machine tool must be attached to the rotating body.

<Second invention>
The rotating body of a machine tool (12) including a rotating body (16) rotating about a rotating axis (A ₁₆ ) and a moving body (20) moving along a moving axis orthogonal to the rotating axis A calculation method for calculating the weight (w _x ) and mounting position (γ _x ) of a correction weight (30 _fix ) attached to the rotating body to correct the balance state, the first balance rotating the rotating body a measuring step (S1), a maximum value (r ₀ ) of the positional deviation (PD) of the moving body when the rotating body is rotated in the first balance measuring step, and the positional deviation reaching the maximum value; After the first balance information acquisition step (S2) of acquiring first balance information (I ₁ ) including the rotation angle (θ ₀ ) of the rotating body when the a temporary weight attaching step (S3) of attaching a temporary weight (30 _temp ) to the rotating body; a second balance measuring step (S4) of rotating the rotating body after the temporary weight attaching step; The maximum value (r ₁ ) of the positional deviation when the rotating body to which the is attached is rotated by the second balance measurement step, and the rotation angle of the rotating body when the positional deviation reaches the maximum value a second balance information acquisition step (S5) for acquiring second balance information (I ₂ ) including (θ ₁ ) _; a temporary weight information acquisition step (S6) for acquiring temporary weight information (I _temp ) including the position (γ ₁ ), and based on the first balance information, the second balance information and the temporary weight information, First information generation for generating correction weight information (I _fix ) including the weight (w _x ) of the correction weight (30 _fix ) for correcting the balance state of the rotating body and the mounting position (γ _x ) of the correction weight. and a step (S7).

This provides a calculation method that reduces the burden on the operator when correcting the balance of the rotating body of the machine tool.

In the first information generating step, the weight of the correction weight may be calculated based on Equation (1), and the mounting position of the correction weight may be calculated based on Equation (2). Thereby, corrected spindle information can be generated.

A plurality of weight mounting portions (32) for mounting the correcting weights are provided in advance on the rotating body, and the calculation method is to determine the number of two or more weight mounting portions among the plurality of weight mounting portions. It may further include a second information generating step of generating two or more resolved corrected weight information (I' _fix ) including a position and a weight attached to each of said two or more weight mounts. Thereby, the operator can appropriately correct the balance state of the rotating body based on the disassembled correction weight information.

The computing method may further include, before the second information generating step, an instruction receiving step of receiving an operator's instruction operation for designating the two weight mounting portions. This allows the operator to designate two weight mounting portions to which the correction weights are to be mounted.

In the second information generating step, the resolved corrected weight information is generated by decomposing a vector whose components are the weight of the corrected weight indicated by the corrected weight information and the mounting position of the corrected weight. good. Thereby, the operator can appropriately correct the balance state of the rotating body based on the disassembled correction weight information.

The first balance measurement step includes a first command output step (S11) for rotating the rotating body, a first rotation angle acquisition step (S12) for acquiring the rotation angle, and a position deviation acquisition step. a first positional deviation obtaining step (S13); The second balance measurement step includes a second command output step (S41) for rotating the rotating body, a second rotation angle acquisition step (S42) for acquiring the rotation angle, and a second rotation angle acquisition step (S42) for acquiring the positional deviation. and a second associating step (S44) of associating a plurality of the rotation angles with the positional deviations corresponding to each of the plurality of rotation angles, wherein the first In the balance information obtaining step, the first balance information is obtained based on the association between the rotation angle and the positional deviation in the first association step, and in the second balance information obtaining step, the first balance information is obtained. The second balance information may be acquired based on the correspondence between the rotation angle and the positional deviation in step 2 of association. Accordingly, the calculation method includes a balance measurement method. Moreover, in the balance measurement, there is no need for a field balancer in which an acceleration sensor separate from the machine tool must be attached to the rotating body.

DESCRIPTION OF SYMBOLS 12... Machine tool 14, 14A, 14B... Arithmetic device 16... Rotating body 20... Moving body 24... 1st detector 30... Weights 32, 32A, 32B... Weight mounting part 46... Rotation angle acquisition part 48... Position deviation acquisition Unit 50 Balance measurement unit 52 First balance information acquisition unit 54 Second balance information acquisition unit 56 Temporary weight information acquisition unit 58 Information generation unit (first information generation unit) 60 Second information Generating unit 62 Instruction receiving unit 64 Table I _fix Corrected weight information I' _fix Disassembled corrected weight information I _temp Temporary weight information PD Position deviation RA Rotation angle

Claims (13)

1. The rotating body of a machine tool (12) comprising a rotating body (16) rotating around a rotating axis (A ₁₆ ) and a moving body (20) moving along a moving axis orthogonal to the rotating axis A computing device (14, 14A) for computing the weight (w _x ) and mounting position (γ _x ) of the correction weight (30 _fix ) attached to the rotating body to correct the balance state,
   The maximum value (r ₀ ) of the positional deviation (PD) of the moving body when the rotating body is rotated and the rotation angle (θ ₀ ) of the rotating body when the positional deviation reaches the maximum value are a first balance information acquisition unit (52) for acquiring first balance information (I ₁ ) including
   After the first balance information is acquired, the maximum value (r ₁ ) of the positional deviation when the rotating body to which the temporary weight (30 _temp ) is attached is further rotated, and the positional deviation reaches the maximum value. a second balance information acquisition unit (54) for acquiring second balance information (I ₂ ) including the rotation angle (θ ₁ ) of the rotating body when the
   a temporary weight information acquisition unit (56) for acquiring temporary weight information (I _temp ) including the weight (w ₁ ) of the temporary weight and the mounting position (γ ₁ ) of the temporary weight with respect to the rotating body;
   Based on the first balance information, the second balance information, and the temporary weight information, the weight (w _x ) of the correction weight (30 _fix ) for correcting the balance state of the rotating body and the mounting position of the correction weight. a first information generator (58) for generating corrected weight information (I _fix ) including (γ _x );
   A computing device.
2. The computing device according to claim 1,
   The first information generation unit is
   Calculate the weight of the correction weight based on the following formula (1),
   A computing device that calculates the mounting position of the correction weight based on the following formula (2).
   (w _x : weight of correction weight, r ₀ : maximum positional deviation indicated by first balance information, r ₁ : maximum positional deviation indicated by second balance information, θ ₀ : first balance information Rotation angle indicated, θ ₁ : rotation angle indicated by second balance information, w ₁ : weight of temporary weight indicated by temporary weight information, γ _x : mounting position of correction weight, γ ₁ : temporary weight indicated by temporary weight information mounting position)
   

   

   
   

   
3. A computing device (14A) according to claim 1 or 2,
   A plurality of weight mounting portions (32) for mounting the correcting weight are provided in advance on the rotating body,
   The computing device is
   a table (64) storing the positions of the plurality of weight mounting portions;
   By decomposing the correction weight information using the table, the positions of two or more weight mounting portions among the plurality of weight mounting portions and the correction weights attached to each of the two or more weight mounting portions a second information generator (60) for generating two or more pieces of resolved corrected weight information (I' _fix ) including the weight of
   A computing device, further comprising:
4. The computing device according to claim 3,
   A computing device, further comprising an instruction receiving section (62) that receives an operator's instruction operation for designating the two or more weight mounting sections.
5. The arithmetic device according to claim 3 or 4,
   The second information generation unit generates the resolved corrected weight information by decomposing a vector (U _x ) whose components are the weight of the corrected weight indicated by the corrected weight information and the mounting position of the corrected weight. A computing device that generates.
6. The arithmetic device according to any one of claims 3 to 5,
   The second information generation unit uses the provisional weight information as one of the two or more pieces of the decomposed correction weight information.
7. The arithmetic device according to any one of claims 1 to 6,
   a rotation angle acquisition unit (46) for acquiring the rotation angle;
   a position deviation acquisition unit (48) for acquiring the position deviation;
   a balance measuring unit (50) that associates the plurality of rotation angles with the positional deviations corresponding to each of the plurality of rotation angles;
   further comprising
   The first balance information acquisition section and the second balance information acquisition section obtain the first balance information and the second balance information based on the association between the rotation angle and the positional deviation by the balance measurement section. A computing device that acquires information.
8. The rotating body of a machine tool (12) including a rotating body (16) rotating about a rotating axis (A ₁₆ ) and a moving body (20) moving along a moving axis orthogonal to the rotating axis A calculation method for calculating the weight (w _x ) and the mounting position (γ _x ) of the correction weight (30 _fix ) attached to the rotating body to correct the balance state,
   a first balance measurement step (S1) of rotating the rotating body;
   The maximum value (r ₀ ) of the positional deviation (PD) of the moving body when the rotating body is rotated by the first balance measurement step, and the rotating body when the positional deviation reaches the maximum value a first balance information acquisition step (S2) for acquiring first balance information (I ₁ ) including the rotation angle (θ ₀ );
   After the first balance information acquisition step, a temporary weight attaching step (S3) of attaching a temporary weight (30 _temp ) to the rotating body;
   a second balance measurement step (S4) of rotating the rotating body after the step of attaching the temporary weight;
   The maximum value (r ₁ ) of the positional deviation when the rotating body to which the temporary weight is attached is rotated by the second balance measurement step, and the rotating body when the positional deviation reaches the maximum value a second balance information acquisition step (S5) for acquiring second balance information (I ₂ ) including the rotation angle (θ ₁ ) of
   a temporary weight information acquisition step (S6) for acquiring temporary weight information (I _temp ) including the weight (w ₁ ) of the temporary weight and the mounting position (γ ₁ ) of the temporary weight with respect to the rotating body;
   Based on the first balance information, the second balance information, and the temporary weight information, the weight (w _x ) of the correction weight (30 _fix ) for correcting the balance state of the rotating body and the mounting position of the correction weight. a first information generating step (S7) for generating corrected weight information (I _fix ) including (γ _x );
   Arithmetic method, including
9. The calculation method according to claim 8,
   In the first information generating step,
   Calculate the weight of the correction weight based on the following formula (1),
   A calculation method for calculating the mounting position of the correction weight based on the following formula (2).
   (w _x : weight of correction weight, r ₀ : maximum positional deviation indicated by first balance information, r ₁ : maximum positional deviation indicated by second balance information, θ ₀ : first balance information Rotation angle indicated, θ ₁ : rotation angle indicated by second balance information, w ₁ : weight of temporary weight indicated by temporary weight information, γ _x : mounting position of correction weight, γ ₁ : temporary weight indicated by temporary weight information mounting position)
   

   

   
   

   
10. The calculation method according to claim 8 or 9,
    A plurality of weight mounting portions (32) for mounting the correcting weight are provided in advance on the rotating body,
    The calculation method is
    two or more pieces of disassembled corrected weight information (I' _fix ) including positions of two or more weight mounting portions among the plurality of weight mounting portions and weights attached to each of the two or more weight mounting portions; The method of computation, further comprising the step of generating second information.
11. 11. The calculation method according to claim 10,
    The computing method further comprising, prior to the second information generating step, an instruction receiving step of receiving an operator's instruction operation designating the two or more weight mounting portions.
12. The calculation method according to claim 10 or 11,
    In the second information generating step, the resolved corrected weight information is generated by decomposing a vector whose components are the weight of the corrected weight indicated by the corrected weight information and the mounting position of the corrected weight. Method.
13. The calculation method according to any one of claims 8 to 12,
    The first balance measurement step includes:
    a first command output step (S11) for rotating the rotating body;
    a first rotation angle acquisition step (S12) for acquiring the rotation angle;
    a first positional deviation obtaining step (S13) for obtaining the positional deviation;
    a first associating step (S14) of associating the plurality of rotation angles with the positional deviations corresponding to each of the plurality of rotation angles;
    including
    The second balance measurement step includes:
    a second command output step (S41) for rotating the rotating body;
    a second rotation angle acquisition step (S42) for acquiring the rotation angle;
    a second positional deviation obtaining step (S43) for obtaining the positional deviation;
    a second associating step (S44) of associating the plurality of rotation angles with the positional deviations corresponding to each of the plurality of rotation angles;
    including
    In the first balance information acquisition step, the first balance information is acquired based on the association between the rotation angle and the positional deviation in the first association step;
    The computing method, wherein the second balance information acquisition step acquires the second balance information based on the association between the rotation angle and the positional deviation in the second association step.

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