JP2021037579A - Machine tool - Google Patents

Abstract

To improve in flexibility in phase-positioning a gear-shaped work.SOLUTION: A machine tool 100 includes a main shaft 1, a work phase-determining member 7, a first drive portion 35 and a second drive portion 37, and a phase setting portion 57. The main shaft 1 supports the work W, and rotates the work W about an axis. The work phase-determining member 7 has a second gear G2 engageable with a first gear G1 formed on an outer peripheral of the work W. The first drive portion 35 and the second drive portion 37 move the work phase-determining member 7 in a tangential direction of a cross-section of the work W supported by the main shaft 1. The phase setting portion 57 controls the first drive portion 35 and the second drive portion 37 to engage the first gear G1 of the work W and the second gar G2 of the work phase-determining member 7, and then move the work phase-determining member 7 in the tangential direction until the engagement of the first gear G1 and the second gear G2 is released, thereby phase-determining in a rotating direction of the work W.SELECTED DRAWING: Figure 1

Description

The present invention relates to a machine tool that processes a gear-shaped workpiece.

Conventionally, a machine tool for processing a gear-shaped workpiece having a plurality of irregularities (teeth) formed on the outer circumference is known. This machine tool can, for example, perform processing such as drilling holes and forming grooves at predetermined positions of the work based on one of a plurality of irregularities. In order to perform such machining with good reproducibility, it is necessary to accurately phase the angle of the work before machining.
As a method for phasing the work, there is a method in which a phasing member having a concave shape corresponding to the convex shape of the work is pressed against the work and the convex shape of the work is imitated by the concave shape of the phasing member (for example, Patent Document). 1).

JP-A-2002-301602

However, with the conventional phase determination method, the amount of rotation of the work at the time of phase determination cannot be increased, and it is difficult to freely phase the work. In some cases, the work does not rotate at all and the phase cannot be determined. Further, in the conventional method, the types of workpieces that can be phase-determined by the phase-determining member are limited. As described above, the conventional method cannot determine the phase with a high degree of freedom.

An object of the present invention is to increase the degree of freedom in phasing a gear-shaped workpiece.

Hereinafter, a plurality of aspects will be described as means for solving the problem. These aspects can be arbitrarily combined as needed.
The machine tool according to the seemingly present invention is a machine tool that processes a gear-shaped workpiece having a plurality of teeth formed on the outer circumference. The machine tool includes a spindle, a work phase determining member, a driving unit, and a phase setting unit.
The spindle supports the work and rotates the work around the axis. The work phase determining member has a second gear that can be meshed with a first gear formed on the outer periphery of the work. The drive unit moves the work phasing member in the tangential direction of the cross section of the work supported by the spindle.
The phase setting unit controls the drive unit to first mesh the first gear of the work with the second gear of the work phase determining member, and then the work until the first gear and the second gear are disengaged. By moving the phase determining member in the tangential direction, the phase is determined in the rotation direction of the work.

In the above machine tool, the first gear formed on the outer periphery of the work and the second gear of the work phase determining member are meshed with each other to phase the work. That is, in this machine tool, as long as it meshes with the second gear of the work phasing member, phasing can be executed for many types of workpieces without being limited by the shape of the first gear of the work.

Further, in the above machine tool, at the time of phasing, after the first gear of the work and the second gear of the work phasing member are meshed with each other, the work is further performed until the first gear and the second gear are disengaged. The phasing member is moved in the tangential direction. As a result, the phase of the work can be determined with a phase angle (rotation amount) larger than that of the conventional method.

When the load applied to the drive unit when the work phase determining member is moved in the tangential direction exceeds a predetermined magnitude, the phase setting unit may perform the phase determination in the rotation direction of the work again.
As a result, when the meshing of the first gear and the second gear is improper and the phasing of the work is not properly performed, the phasing of the work can be executed again.

The phase setting unit may generate an alarm if the state in which the load applied to the drive unit exceeds a predetermined magnitude cannot be eliminated even if the phase determination in the rotation direction of the work is repeated a predetermined number of times.
As a result, it is possible to prevent the improper phasing by generating an alarm when the possibility that the positioning cannot be performed properly even if the phasing of the work is repeatedly executed a predetermined number of times cannot be eliminated. ..

The above machine tool may further include a machining section. The processing section processes a predetermined position between the teeth of the first gear of the work whose phase has been determined.
As a result, desired machining can be performed between the teeth of the first gear of the work based on the state in which the phase is determined.

In a machine tool that processes a gear-shaped workpiece, it is possible to perform phase determination of a workpiece having a high degree of freedom in a large phase range for many types of workpieces.

The figure which shows the structure of the machine tool which concerns on 1st Embodiment. The figure which shows the functional block composition of a control device. The flowchart which shows the outline of the operation of the machine tool at the time of processing a work. A flowchart showing a phase determination operation. The figure which shows typically the principle that a work is phase-determined (the 1). The figure which shows typically the principle that a work is phase-determined (the 2). The figure which shows typically the principle that a work is phase-determined (the 3). The figure which shows typically the principle that a work is phase-determined (the 4). The figure which shows typically the principle that a work is phase-determined (No. 5).

1. 1. First Embodiment (1) Outline of Machine Tool Hereinafter, the configuration of the machine tool 100 according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a machine tool according to the first embodiment. The machine tool 100 according to the first embodiment is a device for processing a gear-shaped work W. The gear-shaped work W refers to a work in which a plurality of irregularities (teeth) are formed on the outer peripheral surface. Hereinafter, a plurality of irregularities formed on the outer peripheral surface of the work W will be referred to as a first gear G1.
In the work W of the present embodiment, the first gear G1 is formed on the entire circumference of the outer peripheral surface of the tip portion. However, the work W is not limited to this, and the work W in which the first gear G1 is formed can be machined over the entire axial direction. Further, not only the work W in which the first gear G1 is formed over the entire circumference of the outer peripheral surface but also the work W in which the first gear G1 is formed only on a part of the outer peripheral surface can be processed.

Here, the term "gear" is not limited to the general "gear", but is defined as a general term for structures such as "splines" in which a plurality of irregularities are formed on the circumferential surface.

(2) Outline of Machine Tool Configuration (2-1) Next, the configuration of the machine tool 100 according to the first embodiment will be described. As shown in FIG. 1, the machine tool 100 mainly includes a spindle 1, a tool post 3, and a control device 5. In FIG. 1, one direction in the paper surface is defined as the Z direction (Z axis), and the direction perpendicular to the Z direction in the paper surface is defined as the X direction (X axis). Further, the direction perpendicular to the paper surface is defined as the Y direction (Y axis).

(2-2) Spindle The spindle 1 supports the work W to be machined and rotates the supported work W about the axis. As shown in FIG. 1, the spindle 1 has a first spindle 11 and a second spindle 13.
The first spindle 11 supports the work W by chucking the tip of the work W on the side where the first gear G1 is formed by the first spindle chuck 11a. The first spindle 11 is connected to the output rotation shaft of the spindle motor 11b, and can rotate around the Z axis by the rotation of the output rotation shaft. Further, a spindle rotation angle detector 11c for detecting the rotation angle of the first spindle 11 is attached to the output rotation shaft of the spindle motor 11b. The spindle rotation angle detector 11c is, for example, an angle detection sensor such as an encoder.

The second spindle 13 is arranged to face the first spindle 11 in the Z direction. That is, the first spindle 11 and the second spindle 13 are arranged side by side in the Z direction. As shown in FIG. 1, the second spindle 13 supports the work W via a centering member 13b chucked by the second spindle chuck 13a. Specifically, the pointed portion formed at the tip of the centering member 13b is fitted into the conical hole H formed at the tip opposite to the first gear G1 of the work W. The work W is supported by the second spindle 13. When the work W rotates about the axis, the centering member 13b does not rotate, and the work W slides at the pointed portion of the centering member 13b in the hole H.

As described above, in the machine tool 100 of the present embodiment, the first spindle 11 and the second spindle 13 support the work W from both sides in the axial direction (Z direction). As a result, the first spindle 11 and the second spindle 13 can support the work W at a fixed position.

The second spindle 13 may or may not have the same function as the spindle of the machine tool as the first spindle 11. Like the first spindle 11, the second spindle 13 having a function as the spindle of the machine tool is rotatable at the time of executing the phase determination of the work W, and has a function of phasing the work W.
On the other hand, the second spindle 13 which does not have a function as the spindle of the machine tool does not rotate at the time of executing the phase determination of the work W, and has only the function of stably supporting the work W.

(2-3) Tool post The tool post 3 is composed of a turret having a polygonal front shape, and is installed on a feed table 31 via a turret shaft 33. The feed base 31 can be moved in the Z direction by the first drive unit 35. Further, the turret shaft 33 can be moved in the X direction and the Y direction with respect to the feed base 31 by the second drive unit 37 provided on the feed base 31. With this configuration, the tool post 3 can be freely moved in three axial directions (X direction, Y direction, Z direction).

The first drive unit 35 is a drive mechanism that moves the feed base 31 in the Z direction. The first drive unit 35 is, for example, a first drive in which the first ball screw 35a extending in the Z direction and screwed into the feed base 31 and the first ball screw 35a are rotated around the Z axis to move the feed base 31 in the Z direction. This can be realized by a mechanism having a motor 35b. Further, a first rotation angle detector 35c for measuring the rotation angle of the first ball screw 35a is attached to the output rotation shaft of the first drive motor 35b. The rotation angle detected by the first rotation angle detector 35c is used to calculate the position of the tool post 3 in the Z direction. The first rotation angle detector 35c is, for example, an angle detection sensor such as an encoder.
The first drive unit 35 can be a drive mechanism having another configuration as long as the feed base 31 can be moved in the Z direction.

The second drive unit 37 is a drive mechanism that moves the tool post 3 in the two axial directions of the X direction and the Y direction with respect to the feed base 31. For example, the second drive unit 37 has the same configuration as the first drive unit 35 for each movement direction (X direction, Y direction) of the tool post 3, that is, the second ball screw 37a, the second drive motor 37b, and the like. It can be realized by a mechanism having a second rotation angle detector 37c. The second drive unit 37 can be a drive mechanism having another configuration as long as the tool post 3 can be moved in the biaxial directions of the X direction and the Y direction with respect to the feed base 31.

Further, the turret shaft 33 can be rotated around the Z axis by the indexing rotation motor 39 provided on the feed base 31. As a result, the tool post 3 can also rotate around the turret shaft 33 (Z-axis).

A work phase determining member 7 and a tool 9 (an example of a machined portion) are attached to a flat surface portion between each corner of the outer peripheral surface of the tool post 3. The work phase determining member 7 is a member having a second gear G2 that can mesh with the first gear G1 of the work W. The first gear G1 and the second gear G2 may be meshed with each other, and the shapes of the first gear G1 and the second gear G2 may be the same or different. The work phase determining member 7 can be freely moved in the three axial directions by moving the tool post 3 by the first drive unit 35 and the second drive unit 37. On the other hand, the work phase determining member 7 is fixed to the tool post 3 via the mounting member 71 and does not rotate about the axis. As will be described later, the work phase determining member 7 is used when phasing the work W before machining.

The tool 9 is a tool for machining a predetermined position between the teeth of the first gear G1 of the phase-determined work W. Specifically, the tool 9 is, for example, a tool having a tip 91 that forms a groove at a predetermined position between the teeth of the first gear G1 attached to the tip thereof. Although only one tool 9 is shown in FIG. 1, a plurality of types of tools 9 other than those for forming grooves between teeth may be attached to the tool post 3.

(2-4) Control device The control device 5 is a computer system including a CPU, a storage device (for example, RAM, ROM, etc.), various interfaces, and the like. The control device 5 controls each component of the machine tool 100. Specifically, the control device 5 controls the spindle motor 11b, the first drive motor 35b, the second drive motor 37b, and the indexing rotation motor 39. Further, the control device 5 inputs the rotation angle detection results of the spindle rotation angle detector 11c, the first rotation angle detector 35c, and the second rotation angle detector 37c, and executes control based on the detection results.
The control of the control device 5 is realized by the functional block configuration as shown in FIG. Part or all of the functions of the functional blocks shown in FIG. 2 are realized by a program stored in the storage device of the control device 5. FIG. 2 is a diagram showing a functional block configuration of the control device.

The control device 5 has each axis control unit 51, a spindle control unit 53, a machining command unit 55, and a phase setting unit 57 as functional blocks.
Each axis control unit 51 controls the first drive unit 35 and the second drive unit 37 to control the movement of the tool post 3 in each axial direction. Specifically, each axis control unit 51 calculates the position (coordinate value) of the tool post 3 in the Z direction from the rotation angle detected by the first rotation angle detector 35c, and the first is based on the calculation result. By controlling the rotation of the drive motor 35b, the movement of the tool post 3 in the Z direction is controlled.
Further, the positions (coordinate values) of the tool post 3 in the X direction and the Y direction are calculated from the rotation angle detected by the second rotation angle detector 37c, and the rotation of the second drive motor 37b is controlled based on the calculation result. By doing so, the movement of the tool post 3 in the X direction and the Y direction is controlled.

The spindle control unit 53 calculates the phase angle of the spindle 1 from the rotation angle detected by the spindle rotation angle detector 11c, controls the rotation of the spindle motor 11b based on the calculation result, and controls the spindle 1 (first spindle). 11) Control the phase angle.

The machining command unit 55 executes control according to a machining program set by the user. Specifically, the machining command unit 55 rotates the indexing rotation motor 39 at a predetermined angle and selects a tool 9 to be used for machining the work W. Further, when executing the phase determination of the work W, the work phase determination member 7 is selected.
After selecting the tool 9, the machining command unit 55 outputs a control command to each axis control unit 51 to control the movement of the tool post 3 according to the machining program, and outputs a control command to the spindle control unit 53 to output the control command to the spindle 1. By controlling the phase angle of, the work W is machined.

The phase setting unit 57 executes the phase determination of the work W before machining. The details will be described later, but the phase setting unit 57 outputs a control command to each axis control unit 51 to move the work phase determining member 7 in the tangential direction of the work, and the second gear G2 of the work phase determining member 7. Is meshed with the first gear G1 of the work W to perform phase determination of the work W.

Further, the phase setting unit 57 monitors the load applied to the first drive unit 35 and the second drive unit 37 when the work phase determination member 7 (cutting base 3) is moved to determine the phase of the work W. Specifically, the phase setting unit 57 outputs the output to the first drive motor 35b and the second drive motor 37b when the work phase determination member 7 (cutting tool base 3) is moved to determine the phase of the work W. The current is monitored as a load on the drive unit.
When the load (current to the motor) of the drive unit moving the work exceeds a predetermined size, the phase setting unit 57 rotates the work W to an arbitrary angle and then phases the work W. Re-execute the decision. Further, if the state in which the load is excessive cannot be resolved even after repeating the phase determination of the work W a predetermined number of times, the phase setting unit 57 issues an alarm indicating that the phase determination of the work W is not properly performed. To do.

(3) Machine Tool Operation (3-1) Outline of Operation The operation when the work W is machined by the machine tool 100 having the above configuration will be described below. First, the outline of the operation of the machine tool 100 at the time of machining the work W will be described with reference to FIG. FIG. 3 is a flowchart showing an outline of the operation of the machine tool during machining of the workpiece.
First, in step S1, the work W to be machined is supported on the spindle 1. Specifically, the work W is held by the first spindle chuck 11a, and the work W is supported by the first spindle 11. Further, the pointed portion of the centering member 13b is fitted into the conical hole H of the work W, and the work W is supported by the second main shaft 13.

After the work W is supported by the spindle 1 and various adjustments are made as necessary in the machine tool 100, the machining command unit 55 rotates the tool post 3 to position the work phase determining member 7 in a position where the phase can be determined. Deploy. After that, in step S2, the phase determination in the rotation direction of the work W using the work phase determining member 7 is executed. The operation at the time of phase determination in step S2 will be described in detail later.

After executing the phase determination of the work W, the phase-determined work W is processed in step S3. Specifically, after executing the phase determination of the work W, the machining command unit 55 selects the tool 9 to be used for machining according to the machining program. After that, the tool post 3 is rotated to arrange the selected tool 9 on the work W side. After that, the machining command unit 55 outputs a control command to each axis control unit 51 and the spindle control unit 53 according to the machining program, so that the machining indicated in the machining program is performed on the work W.

As will be described later, by executing the phase determination in step S2, the work W having the first gear G1 having the same shape is reproduced with the directions of the convex portions and the concave portions of the first gear G1 always being the same. The work W can be phased well.
Therefore, by executing the machining of the work W after executing the phase determination in step S2, the work W can be subjected to the desired machining based on the state in which the phase determination has been performed. For example, machining such as forming a groove at a fixed position between the teeth of the first gear G1 of the work W and cutting a fixed convex portion of the first gear G1 can be performed with good reproducibility.

(3-2) Phase Determination Operation Next, a specific operation of phase determination executed in step S2 will be described with reference to FIG. FIG. 4 is a flowchart showing the phase determination operation. Before starting the phase determination operation, the spindle 1 is set to the "free state". Specifically, the free state is a state in which the spindle 1 rotates about an axis even when a weak rotational force is applied. Further, the coordinate values of the positions where the movement in the tangential direction is started (referred to as the movement start position Ps) and the coordinate values of the positions where the movement is ended (referred to as the movement end position Pe) are set. In the present embodiment, the first spindle 11 is in the free state, and the second spindle 13 is not in the free state.
After completing the preparation for the above phase determining operation, in step S21, the phase setting unit 57 outputs a control command to each axis control unit 51 to move the tool post 3, and the work phase determining member 7 is moved to the start position. Move to Ps.

After that, in step S22, the phase setting unit 57 outputs a control command to each axis control unit 51 to move the tool post 3, and directs the work phase determining member 7 from the movement start position Ps to the movement end position Pe. To move. As a result, the work phase determining member 7 moves in the tangential direction of the cross section of the work W (first gear G1).
As will be described later, the second gear G2 of the work phasing member 7 meshes with the first gear G1 during the movement in the tangential direction, and after the work phasing member 7 further moves in the meshed state, the first gear The meshed state of G1 and the second gear G2 is released.

During the movement in the tangential direction, in step S23, the phase setting unit 57 monitors the state of the load applied to the first drive unit 35 and / or the second drive unit 37. Specifically, the phase setting unit 57 monitors whether or not an excessive current is supplied to the first drive motor 35b and / or the second drive motor 37b, and monitors the first drive unit 35 and / or the second. It monitors whether or not the load applied to the drive unit 37 is excessive.

An excessive current is not supplied to the first drive motor 35b and / or the second drive motor 37b (the current is a steady value), and the load applied to the first drive unit 35 and / or the second drive unit 37 is normal. (“Normal” in step S23), in step S24, the phase setting unit 57 determines whether or not the work phase determining member 7 has reached the set movement end position Pe.
When it is determined that the work phasing member 7 has not reached the movement end position Pe (“No” in step S24), the phasing operation returns to step S23, and the work phasing member 7 is moved in the tangential direction. continue.

On the other hand, when it is determined that the work phasing member 7 has reached the movement end position Pe (“Yes” in step S24), the phase setting unit 57 stops the movement of the work phasing member 7 in step S25 and works. The phase angle of the spindle 1 at the timing when the phase determining member 7 reaches the movement end position Pe is set as the reference phase angle for subsequent machining. For example, the rotation angle detected by the spindle rotation angle detector 11c at the above timing is set to a reference phase angle (for example, phase angle = 0). After that, the phase determination operation is terminated.

As will be described later, for the first gear G1 having the same shape, when the work phase determining member 7 reaches the movement end position Pe, the convex portion and the concave portion of the first gear G1 of the work W always have the same orientation. Turn to. Therefore, by using the phase angle of the spindle 1 at the time when the work phase determining member 7 reaches the movement end position Pe as a reference, the phase is determined with good reproducibility for the work W having the first gear G1 having the same shape. can do.

Returning to the description of the operation while moving the work phase determining member 7 in the tangential direction again. While the work phase determining member 7 is moving in the tangential direction, an excessive current is supplied to the first drive motor 35b and / or the second drive motor 37b, and the load applied to the first drive unit 35 and / or the second drive unit 37. When it is determined that the state of is an error state, that is, when it is determined that the load applied to the first drive unit 35 and / or the second drive unit 37 exceeds a predetermined magnitude (“error” in step S23”. ), In order to eliminate this error state, it is determined whether or not to execute the phase determination of the work W again. Specifically, in step S26, the phase setting unit 57 determines whether or not the phase determination of the work W has been repeated a predetermined number of times.

When the phase determination of the work W is executed less than a predetermined number of times (“No” in step S26), after rotating the first gear G1 (work W) by an arbitrary angle, the positioning operation is performed in step S21. Return to. That is, after rotating the first gear G1 (work W) by an arbitrary angle, the phase determination of the work W is executed again.
On the other hand, when the phase determination of the work W has already been repeated a predetermined number of times (“Yes” in step S26), it is assumed that the state where the load is excessive cannot be resolved even if the phase determination of the work W is repeated a predetermined number of times, and the phase In step S28, the setting unit 57 generates an alarm indicating that the phase determination of the work W is not properly performed. For example, the phase setting unit 57 generates an alarm by turning on an alarm lamp or the like provided on the machine tool 100, generating a sound from a speaker, or the like. After that, the phase determination operation of the work W is completed.

If an excessive load is applied to the first drive unit 35 and / or the second drive unit 37 while the work phase determining member 7 is moving in the tangential direction, the meshing state of the first gear G1 and the second gear G2 is not correct. It is appropriate. When the meshing state is inappropriate, for example, when the first gear G1 and the second gear G2 are not properly meshed, the first gear G1 and the second gear G2 push each other with an excessive force. There are cases where there is.

If the meshing state of the first gear G1 and the second gear G2 is improper as described above, the phase of the work W may not be properly determined. Therefore, when the load applied to the first drive unit 35 and / or the second drive unit 37 is excessive, the phase determination of the work W is executed again after rotating the first gear G1 by an arbitrary angle. By rotating the first gear G1 by an arbitrary angle and changing the unevenness of the first gear G1 that meshes with the unevenness of the second gear G2, the meshing of the first gear G1 and the second gear G2 is made appropriate and again. It is possible to increase the possibility that the phase determination of the work of the above can be performed properly.

Further, even if the phase determination of the work W is repeated a predetermined number of times, an alarm is generated when the state in which the load applied to the first drive unit 35 and / or the second drive unit 37 is excessive cannot be resolved, thereby causing a load. It is possible to prevent improper phasing from being executed while the value is excessive.

(3-3) Principle of Phase Determination Next, the principle of phase determination of the work W by executing the above steps S21 to S26 will be described with reference to FIGS. 5A to 5E. 5A to 5E are diagrams schematically showing the principle of phasing the workpiece.
In FIGS. 5A to 5E, a case where the work phase determining member 7 is moved along the tangent line of the work W in the Y direction will be described as an example. That is, in the examples shown in FIGS. 5A to 5E, the work phase determining member 7 moves in the Y direction.

When the work phasing member 7 is located at the movement start position Ps, that is, when the work phasing member 7 starts moving, the first gear G1 of the work W and the second gear G2 of the work phasing member 7 mesh with each other. Not done (Fig. 5A). When the work phase determining member 7 moves from the movement start position Ps in the Y direction (arrow direction) and reaches the first position P1, the first gear G1 and the second gear G2 start meshing (FIG. 5B).

When the work phase determining member 7 further moves in the Y direction from the first position P1 in a state where the first gear G1 and the second gear G2 are meshed with each other, the second gear G2 of the work phase determining member 7 moves with respect to the work W. A rotational force is applied, and the spindle 1 and the work W rotate around the Z axis (FIG. 5C).
When the work phase determining member 7 moves further in the Y direction from the state shown in FIG. 5C to the second position P2 where the meshing state of the first gear G1 and the second gear G2 is released, the spindle 1 and the work W Is rotated by an angle θ from the state before the first gear G1 and the second gear G2 start meshing (FIG. 5D).
After that, while the work phase determining member 7 moves from the second position P2 to the movement end position Pe, the first gear G1 and the second gear G2 are not meshed with each other, so that the spindle 1 and the work W do not rotate and FIG. 5D. It is maintained in the state shown in (Fig. 5E).

As described above, the work phasing member 7 is fixed to the tool post 3 via the mounting member 71, and does not rotate while moving from the movement start position Ps to the movement end position Pe. Therefore, the directions of the convex portions and the concave portions of the second gear G2 of the work phase determining member 7 do not change during the movement from the movement start position Ps to the movement end position Pe.

Therefore, the timing at which the first gear G1 and the second gear G2 start meshing, that is, the directions of the convex portions and the concave portions of the first gear G1 when the work phase determining member 7 reaches the first position P1 are the same. It is always the same for the first gear G1 of the shape.
Similarly, the timing at which the engagement between the first gear G1 and the second gear G2 is released, that is, the orientation of the convex portion and the concave portion of the first gear G1 when the work phase determining member 7 reaches the second position P2 , It is always the same for the first gear G1 having the same shape.

As a result of the above, for the work W having the first gear G1 having the same shape, by moving the work phase determining member 7 from the movement start position Ps to the movement end position Pe, the orientation of the convex portion and the concave portion of the first gear G1. The work W can be phased with good reproducibility while keeping the same value.

Further, the principle of phasing described above is similarly generated as long as the first gear G1 of the work W meshes with the second gear G2 of the work phasing member 7. That is, the phase determination method of the present embodiment is not limited to the shape of the first gear G1 of the work W, and can be applied to many types of work W.
In the phase determination method of the present embodiment, the shape of the first gear G1 depends on the orientation of the convex portion and the concave portion of the first gear G1 after the phase determination, and the work W and the spindle 1 before and after the phase determination. The amount of rotation.

Further, in the phase determining method of the present embodiment, after the first gear G1 of the work W and the second gear G2 of the work phase determining member 7 are meshed, the meshing of the first gear G1 and the second gear G2 is further performed. The work phase determining member 7 is moved in the tangential direction until it is released. As a result, the phase determination of the work W can be executed with a phase angle (rotation amount) larger than that of the conventional method.

As described above, the phase determination method of the present embodiment can be used without being limited to the shape of the first gear G1 of the work W, and the phase can be determined with a relatively large phase angle (rotation amount), so that the degree of freedom is high. High phase determination can be realized.

2. Features of the Embodiment The embodiment can also be described as follows.
The machine tool (for example, machine tool 100) includes a spindle (for example, spindle 1), a work phasing member (for example, a work phasing member 7), and a drive unit (for example, a first drive unit 35 and a second drive unit). 37) and a phase setting unit (for example, a phase setting unit 57) are provided.
The spindle supports the work (for example, the work W) and rotates the work about the axis. The work phase determining member has a second gear (for example, a second gear G2) that can mesh with a first gear (for example, the first gear G1) formed on the outer periphery of the work. The drive unit moves the work phasing member in the tangential direction of the cross section of the work supported by the spindle.
The phase setting unit controls the drive unit to first mesh the first gear of the work with the second gear of the work phase determining member, and then the work until the first gear and the second gear are disengaged. By moving the phase determining member in the tangential direction, the phase is determined in the rotation direction of the work.

In the above machine tool, the first gear of the work and the second gear of the work phase determining member are meshed with each other to phase the work. That is, in this machine tool, as long as it meshes with the second gear of the work phasing member, phasing can be executed for many types of workpieces without being limited by the shape of the first gear of the work.

Further, in the above machine tool, at the time of phasing, after the first gear of the work and the second gear of the work phasing member are meshed with each other, the work is further performed until the first gear and the second gear are disengaged. The phasing member is moved in the tangential direction. As a result, the phase of the work can be determined with a phase angle (rotation amount) larger than that of the conventional method.

3. 3. Other Embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention. In particular, the plurality of embodiments and modifications described herein can be arbitrarily combined as needed.
Further, the processing content of each step in the flowcharts shown in FIGS. 3 and 4 and / or the execution order of each step can be changed without departing from the gist of the invention.

(A) In the above-mentioned first embodiment, the cross section of the work phasing member 7 is circular. Not limited to this, a flat member (for example, a rack gear) having irregularities formed on the surface can be used as the work phase determining member 7. That is, the work phase determining member 7 may be a member having a rack gear as the second gear G2.

(B) The phase determination described in the first embodiment can be executed in a plurality of stages for one work W. For example, the work W can be phase-determined by combining the movement of the work phasing member 7 in one tangential direction of the work W and the movement of the work phasing member 7 in the other tangential direction of the work W. As a result, phase determination with a higher degree of freedom can be realized.
In this multi-step phasing, for example, the shape of the work phasing member 7 is made to correspond to the quadrature phasing, and / or the work phasing member 7 is set a plurality of times in different tangential directions of the work W. It can be realized by moving it.

(C) The monitoring of the load applied to the first drive unit 35 and / or the second drive unit 37 described in the first embodiment can be used for detecting the work W whose phase cannot be determined (different type detection).
As described above, when the work phase determining member 7 is being moved for determining the movement, the load applied to the first drive unit 35 and / or the second drive unit 37 becomes excessive, which means that the first gear G1 of the work W This means that and the second gear G2 of the work phase determining member 7 do not properly mesh with each other.
Using this principle, it can be determined that the work W having the first gear G1 that does not properly mesh with the second gear G2 is a defective work that is not suitable for phase determination.

The present invention can be widely applied to machine tools that process workpieces having a gear shape.

100 Machine tool 1 Spindle 11 1st spindle 11a 1st spindle chuck 11b Spindle motor 11c Spindle rotation angle detector 13 2nd spindle 13a 2nd spindle chuck 13b Centering member 3 Tool post 31 Feeding platform 33 Turret shaft 35 1st drive unit 35a 1st ball screw 35b 1st drive motor 35c 1st rotation angle detector 37 2nd drive unit 37a 2nd ball screw 37b 2nd drive motor 37c 2nd rotation angle detector 39 Indexing rotation motor 5 Control device 51 Each axis control unit 53 Spindle control unit 55 Machining command unit 57 Phase setting unit 7 Work phase determination member 71 Mounting member G2 2nd gear 9 Tool W work G1 1st gear P1 1st position P2 2nd position Pe Movement end position Ps Movement start position

Claims (4)

A machine tool that processes gear-shaped workpieces with multiple teeth formed on the outer circumference.
A spindle that supports the work and rotates the work about an axis,
A work phasing member having a second gear that can be meshed with a first gear formed on the outer circumference of the work.
A drive unit that moves the work phasing member in the tangential direction of the cross section of the work supported by the spindle, and
The drive unit is controlled to engage the first gear of the work with the second gear of the work phasing member, and then the first gear and the second gear are disengaged until the engagement is released. A phase setting unit that determines the phase of the work in the rotation direction by moving the work phase determining member in the tangential direction.
A machine tool. The claim that the phase setting unit re-executes the phase determination in the rotation direction of the work when the load applied to the drive unit exceeds a predetermined magnitude when the work phase determining member is moved in the tangential direction. The machine tool according to 1. 2. The phase setting unit generates an alarm if the state in which the load applied to the drive unit exceeds a predetermined magnitude cannot be eliminated even if the phase determination in the rotation direction of the work is repeated a predetermined number of times. Machine tools listed in. The machine tool according to any one of claims 1 to 3, further comprising a processing portion for processing a predetermined position between the teeth of the first gear of the work whose phase has been determined.