JPWO2016152768A1 - Machine tool and control device for this machine tool - Google Patents

Abstract

To provide a machine tool that cuts off chips and reduces the load of a cutting tool, and a control device for the machine tool. In a state where the cutting tool (130) and the work (W) are separated from each other within the feed section S of the cutting tool (130) in the range where the cutting parts overlap during the forward movement and the backward movement, the cutting tool (130 The machine tool (100) and the control device (C) configured to provide the separation feed section (A4, A1) in which the feed operation is performed.

Description

  The present invention relates to a machine tool that processes a workpiece while sequentially cutting chips at the time of cutting, and a control device for the machine tool.

Conventionally, a workpiece holding means for holding a workpiece, a tool rest for holding a cutting tool for cutting the workpiece, and a relative movement of the workpiece holding means and the tool rest to fix the cutting tool to the workpiece. The workpiece holding means and the tool post relatively vibrate so that the cutting tool is fed in the machining feed direction while reciprocatingly vibrating along the machining feed direction. 2. Description of the Related Art A machine tool including a vibrating unit that rotates and a rotating unit that relatively rotates the workpiece and the cutting tool is known (see, for example, Patent Document 1).
The machine tool control device drives and controls the rotation unit, the feeding unit, and the vibration unit, and performs a relative rotation between the workpiece and the cutting tool, and the processing feed direction of the cutting tool with respect to the workpiece. The machine tool is caused to perform machining of the workpiece by the feeding operation accompanied with the reciprocating vibration.

Japanese Patent No. 5033929 (see paragraph 0049)

  In the conventional machine tool described above, the cutting tool is always in contact with the workpiece when the workpiece is being cut while reciprocatingly vibrating the cutting tool in the feed direction. there were.

  Therefore, the present invention solves the problems of the prior art as described above, that is, an object of the present invention is to cut a chip and reduce the load on the cutting tool, and control of the machine tool. Is to provide a device.

  According to the first aspect of the present invention, there is provided a workpiece holding means for holding a workpiece, a tool post for holding a cutting tool for cutting the workpiece, and cutting with respect to the workpiece by relative movement of the workpiece holding means and the tool rest. A feed means for feeding the tool in a predetermined machining feed direction, a vibrating means for relatively vibrating the work holding means and the tool rest along the work feed direction, and the work and the cutting tool relatively rotate. A rotating feeding means, wherein the cutting part at the time of reciprocating vibration is overlapped with the cutting part at the time of backward movement, and the cutting tool is reciprocally oscillated along the machining feed direction. The vibration means and the rotation means are driven and controlled so as to be fed to each other, the relative rotation between the workpiece and the cutting tool, and the reciprocating vibration in the machining feed direction of the cutting tool with respect to the workpiece. A machine tool that performs machining of a workpiece by the accompanying feeding operation, wherein the cutting tool and the workpiece are within a feeding section of the cutting tool in a range where cutting parts at the time of forward movement and backward movement overlap. The above-described problems are solved by providing a separation feeding section in which the cutting tool is fed in a state where the cutting tools are separated from each other.

  In addition to the configuration of the machine tool described in claim 1, the invention according to claim 2 is configured such that the cutting tool and the workpiece are moved along a cutting direction of the cutting tool. The above-described problem is further solved by adopting a configuration in which the workpiece is separated from the workpiece.

  In the invention according to claim 3, in addition to the configuration of the machine tool described in claim 1 or claim 2, the separated feed section overlaps the cutting part at the time of the forward movement and the backward movement. By adopting a configuration that occupies the entire feed section of the cutting tool in the range, the above-described problems are further solved.

  The invention according to claim 4 cuts the workpiece by a workpiece holding means for holding the workpiece, a tool post for holding a cutting tool for cutting the workpiece, and a relative movement between the workpiece holding means and the tool post. A feed means for feeding the tool in a predetermined machining feed direction, a vibrating means for relatively vibrating the work holding means and the tool rest along the work feed direction, and the work and the cutting tool relatively rotate. Provided in a machine tool provided with a rotating means for causing the cutting tool to reciprocate along the machining feed direction by overlapping a cutting part at the time of reciprocating vibration and a cutting part at the time of reverse movement. The vibration means and the rotation means are driven and controlled so as to feed in the machining feed direction while vibrating, the relative rotation between the workpiece and the cutting tool, and the machining feed direction of the cutting tool with respect to the workpiece A machine tool control device that performs workpiece machining so that a cutting portion at the time of forward movement in the machining feed direction and a cutting portion at the time of backward movement overlap with each other by the feed operation accompanied with the reciprocating vibration of The cutting tool is fed in a state where the cutting tool and the workpiece are separated from each other within the feeding section of the cutting tool in a range where the cutting parts at the time of forward movement and backward movement overlap. The above-described problem is solved by providing a separate feed section.

  According to the machine tool of the first aspect of the present invention, the cutting tool and the workpiece are separated from each other in the feed section of the cutting tool in a range where the cutting parts at the time of the forward movement and the backward movement overlap. In this state, a separation feed section in which the cutting tool is fed is provided. In the separation feed section, the cutting tool and the workpiece are separated from each other, and the cutting tool is not in contact with the workpiece. The load on the cutting tool can be reduced without disturbing the cutting process.

  According to the machine tool of the invention according to claim 2, in addition to the effect of the invention according to claim 1, the cutting tool and the workpiece are separated from each other, the cutting tool and the workpiece are It can be easily performed by moving along the cutting direction.

  According to the machine tool of the invention according to claim 3, in addition to the effect produced by the invention according to claim 1 or claim 2, the cutting process portion at the time of the forward movement and the backward movement is overlapped. Since the cutting tool does not contact the workpiece over the entire feeding section of the cutting tool, it is possible to prevent an adverse effect due to the contact between the cutting tool and the workpiece on the workpiece processing surface.

  According to the machine tool control device of the present invention, the same effect as the effect of the invention according to claim 1 can be obtained in the machine tool control device.

The figure which shows the outline of the machine tool of 1st Example of this invention. Schematic which shows the relationship between the cutting tool of 1st Example of this invention, and a workpiece | work. The figure which shows the reciprocation vibration and position of a Z-axis direction of the cutting tool of 1st Example of this invention. The figure which shows the relationship of the spindle n rotation of the 1st Example of this invention, n + 1 rotation, and n + 2 rotation. The figure which shows the operation example of the vibration of the Z-axis direction and X-axis direction of 1st Example of this invention. The figure which shows the operation example of the vibration of the Z-axis direction and X-axis direction of 2nd Example of this invention. The figure which shows the operation example of the vibration of the Z-axis direction and X-axis direction of 3rd Example of this invention.

  The machine tool of the present invention and the control device for this machine tool are in a state where the cutting tool and the work are separated in the feeding section of the cutting tool in a range where the cutting parts at the time of forward movement and backward movement overlap. By adopting a configuration in which a separation feed section in which the cutting tool is fed is provided, chips are divided and the load on the cutting tool due to the cutting tool not contacting the workpiece is reduced while the cutting tool is separated from the workpiece. As long as it is a thing, the concrete embodiment may be what kind of thing.

FIG. 1 is a diagram showing an outline of a machine tool 100 including a control device C according to the first embodiment of the present invention.
The machine tool 100 includes a main shaft 110 as a rotating means and a cutting tool base 130A as a tool rest.
A chuck 120 as a work holding means is provided at the tip of the main shaft 110.
The workpiece W is held on the spindle 110 via the chuck 120.
The main shaft 110 is supported by the main shaft 110A so as to be rotationally driven by the power of a main shaft motor (not shown).

The headstock 110A is mounted on the bed side of the machine tool 100 so as to be movable in the Z-axis direction, which is the axial direction of the main shaft 110, by the Z-axis direction feed mechanism 160.
The spindle 110 is moved in the Z-axis direction by the Z-axis direction feed mechanism 160 via the spindle stock 110A.
The Z-axis direction feed mechanism 160 constitutes a main shaft moving mechanism that moves the main shaft 110 in the Z-axis direction.

The Z-axis direction feed mechanism 160 includes a base 161 integrated with a fixed side of the Z-axis direction feed mechanism 160 such as the bed, and a Z-axis direction guide rail 162 provided on the base 161 and extending in the Z-axis direction. Yes.
A Z-axis direction feed table 163 is slidably supported on the Z-axis direction guide rail 162 via a Z-axis direction guide 164.
A mover 165a of the linear servo motor 165 is provided on the Z-axis direction feed table 163 side, and a stator 165b of the linear servo motor 165 is provided on the base 161 side.

The headstock 110 </ b> A is mounted on the Z-axis direction feed table 163, and the Z-axis direction feed table 163 is driven to move in the Z-axis direction by driving the linear servo motor 165.
As the Z-axis direction feed table 163 moves, the headstock 110A moves in the Z-axis direction, and the spindle 110 moves in the Z-axis direction.

A cutting tool 130 such as a cutting tool for turning the workpiece W is mounted on the cutting tool base 130A.
The cutting tool base 130A is moved to the bed side of the machine tool 100 by an X-axis direction feed mechanism 150 and a Y-axis direction feed mechanism (not shown), an X-axis direction orthogonal to the Z-axis direction, and the Z-axis direction and X-axis direction. It is provided so as to be movable in the Y-axis direction orthogonal to.
The X-axis direction feed mechanism 150 and the Y-axis direction feed mechanism constitute a tool post moving mechanism that moves the cutting tool base 130A in the X-axis direction and the Y-axis direction with respect to the main shaft 110.

The X-axis direction feed mechanism 150 includes a base 151 that is integral with the fixed side of the X-axis direction feed mechanism 150, and an X-axis direction guide rail 152 that is provided on the base 151 and extends in the X-axis direction.
An X-axis direction feed table 153 is slidably supported on the X-axis direction guide rail 152 via an X-axis direction guide 154.

A mover 155a of the linear servo motor 155 is provided on the X-axis direction feed table 153 side, and a stator 155b of the linear servo motor 155 is provided on the base 151 side.
By driving the linear servo motor 155, the X-axis direction feed table 153 is driven to move in the X-axis direction.
Note that the Y-axis direction feed mechanism is a structure in which the X-axis direction feed mechanism 150 is arranged in the Y-axis direction and has the same structure as the X-axis direction feed mechanism 150, and therefore a detailed description of the structure is omitted.

In FIG. 1, an X-axis direction feed mechanism 150 is mounted on the bed side via a Y-axis direction feed mechanism (not shown), and a cutting tool table 130A is mounted on the X-axis direction feed table 153.
The cutting tool base 130A moves in the X-axis direction by the movement drive of the X-axis direction feed table 153, and the Y-axis direction feed mechanism operates in the same manner as the X-axis direction feed mechanism 150 in the Y-axis direction. To move in the Y-axis direction.

  A Y-axis direction feed mechanism (not shown) may be mounted on the bed side via the X-axis direction feed mechanism 150, and the cutting tool base 130A may be mounted on the Y-axis direction feed mechanism side. Since the structure in which the cutting tool base 130A is moved in the X-axis direction and the Y-axis direction by the X-axis direction feed mechanism 150 and the X-axis direction feed mechanism 150 is conventionally known, detailed description and illustration are omitted.

  The turret moving mechanism (X-axis direction feeding mechanism 150 and Y-axis direction feeding mechanism) and the main shaft moving mechanism (Z-axis direction feeding mechanism 160) cooperate to provide an X-axis direction feeding mechanism 150 and a Y-axis direction feeding mechanism. The cutting tool table 130A is mounted on the cutting tool table 130A by the movement of the cutting tool table 130A in the X-axis direction and the Y-axis direction due to the movement of the main shaft table 110A (main shaft 110) in the Z-axis direction by the Z-axis direction feed mechanism 160. The cutting tool 130 is fed relative to the workpiece W in an arbitrary machining feed direction.

  By feeding the cutting tool 130 in an arbitrary machining feed direction relative to the workpiece W by feeding means constituted by the spindle moving mechanism and the tool post moving mechanism, as shown in FIG. W is cut into an arbitrary shape by the cutting tool 130.

In this embodiment, both the headstock 110A and the cutting tool base 130A are configured to move, but the headstock 110A is fixed so as not to move to the bed side of the machine tool 100, and the tool post is moved. The mechanism may be configured to move the cutting tool base 130A in the X-axis direction, the Y-axis direction, and the Z-axis direction.
In this case, the feeding means is composed of a tool post moving mechanism that moves the cutting tool base 130A in the X-axis direction, the Y-axis direction, and the Z-axis direction, and is fixedly positioned and rotated relative to the main spindle 110. By moving the cutting tool base 130A, the cutting tool 130 can be processed and fed to the workpiece W.

Further, the cutting tool base 130A may be fixed so as not to move to the bed side of the machine tool 100, and the spindle moving mechanism may be configured to move the spindle base 110A in the X axis direction, the Y axis direction, and the Z axis direction. Good.
In this case, the feed means is composed of a spindle stock moving mechanism that moves the spindle stock 110A in the X-axis direction, the Y-axis direction, and the Z-axis direction. By moving 110 </ b> A, the cutting tool 130 can be processed and fed with respect to the workpiece W.
In this embodiment, the work W is rotated with respect to the cutting tool 130. However, the cutting tool 130 may be rotated with respect to the work W.

The rotation of the main shaft 110, the Z-axis direction feed mechanism 160, the X-axis direction feed mechanism 150, and the Y-axis direction feed mechanism are driven and controlled by a control unit C1 included in the control device C.
The control unit C1 controls each spindle mechanism 110A or the cutting tool base 130A to move in each direction while reciprocatingly vibrating along the corresponding moving directions, using each feed mechanism as a vibration means.

  As shown in FIG. 3, each feed mechanism is controlled by the control unit C <b> 1 to move the spindle 110 or the cutting tool base 130 </ b> A forward (forward) by a predetermined advance amount in one reciprocating vibration, and then move to a predetermined position. Are moved in the respective moving directions by the amount of advance of the difference, and in cooperation, the cutting tool 130 is fed to the workpiece W in the machining feed direction.

  The machine tool 100 uses a Z-axis direction feed mechanism 160, an X-axis direction feed mechanism 150, and a Y-axis direction feed mechanism, while the cutting tool 130 reciprocally vibrates along the machining feed direction, that is, one revolution of the spindle, that is, the spindle The workpiece W is machined by being fed in the machining feed direction with the total amount of advancement when the phase changes from 0 ° to 360 ° as the feed amount.

While the workpiece W is rotated, the head stock 110A (main shaft 110) or the cutting tool base 130A (cutting tool 130) moves while reciprocatingly oscillating, and the workpiece W is cut into a predetermined shape by the cutting tool 130. In this case, the peripheral surface of the workpiece W is cut into a sinusoidal shape as shown in FIG.
In addition, in the virtual line (one-dot chain line) passing through the trough of the sinusoidal waveform, the change amount of the position when the main axis phase changes from 0 ° to 360 ° indicates the feed amount.
As shown in FIG. 4, the description will be made taking an example in which the frequency N of the head stock 110A (main shaft 110) or the cutting tool base 130A per rotation of the workpiece W is 3.5 times (frequency N = 3.5). To do.

  In this case, the lowest point of the trough in the phase of the workpiece circumferential surface turned by the n + 1-th rotation (where n is an integer equal to or greater than 1) (a dotted waveform that is the point most cut in the feed direction by the cutting tool 130) The position of the peak of the graph) is the main axis phase direction (the peak of the graph) relative to the position of the lowest point of the phase trough (vertical peak of the solid line waveform graph) of the shape turned by the n-th cutting tool 130. It shifts in the horizontal axis direction).

As a result, the cutting part at the time of the forward movement of the cutting tool 130 and the cutting part at the time of the backward movement partially overlap, and the part that has been cut at the n-th rotation is added to the n + 1-th cutting part of the work surface. When the cutting tool 130 passes over a processed surface that is a cut portion of the workpiece W in the processing feed direction during vibration cutting, an idling operation that does not cut the workpiece W occurs.
Chips generated from the workpiece W at the time of cutting are sequentially divided by the idling motion.
The machine tool 100 can smoothly perform the external cutting of the workpiece W while dividing the chips by the reciprocating vibration along the cutting feed direction of the cutting tool 130.

When the chips are sequentially cut by the reciprocating vibration of the cutting tool 130, it is only necessary that the n + 1-th cut portion of the work peripheral surface includes a portion that has been cut at the n-th turn.
In other words, it is only necessary that the trajectory of the cutting tool 130 during the backward movement at the (n + 1) th rotation (n is an integer of 1 or more) of the workpiece circumferential surface reaches the trajectory of the cutting tool 130 at the nth rotation of the workpiece circumferential surface.
As shown in FIG. 4, it is not always necessary to reverse the phase of the shape turned by the cutting tool 130 in the (n + 1) th rotation and the nth rotation of the workpiece W by 180 °.

For example, the frequency N can be 1.1, 1.25, 2.6, 3.75, or the like.
It is also possible to set so that less than one vibration (0 <frequency N <1.0) is performed by one rotation of the workpiece W.
In this case, the main shaft 110 rotates one rotation or more with respect to one vibration.

In the machine tool 100, the operation command by the control unit C1 is performed every predetermined command time unit.
The reciprocating vibration of the head stock 110A (main shaft 110) or the cutting tool base 130A (cutting tool 130) can be operated at a predetermined frequency based on the command time unit.
For example, in the case of the machine tool 100 that can send a command 250 times per second by the control unit C1, the operation command by the control unit C1 is executed at a cycle of 1/250 = 4 (ms) (each command time unit). Is called.

The control unit C1 according to the present embodiment performs a workpiece machining surface W1 in which the cutting tool 130 is a machined surface of the workpiece W along the cutting direction during an idling operation during vibration cutting with a predetermined cutting amount with respect to the workpiece W. Reciprocally vibrate away from
For example, when the machining feed direction is the Z-axis direction, the cutting tool 130 is reciprocally oscillated so as to be separated from the workpiece machining surface W1 that is the machined surface of the workpiece W in the X-axis direction, which is the workpiece radial direction, during the idling operation.
That is, the cutting tool 130 is fed in a state in which the cutting tool 130 and the workpiece W are separated from each other in the feeding section S of the cutting tool 130 in a range where the cutting parts at the time of forward movement and backward movement overlap. The separation feed section is provided.

As shown in FIG. 5, from the end of the arrow A3 where the cutting tool 130 is located in the feeding section S when the reciprocating vibration is returned, the control unit C1 moves the cutting tool 130 as shown by the arrow A4. The workpiece is moved in a direction away from the workpiece machining surface W1 along the cutting direction within the range of the idling motion, and is separated from the workpiece W by a predetermined distance, and is moved to the workpiece machining surface W1 along the cutting direction as indicated by an arrow A1. The cutting edge 130 of the cutting tool 130 is moved to a position where a predetermined cutting amount is cut, and is brought into contact with the workpiece processing surface W1 at a predetermined position on the path of the feeding section S.
When the cutting tool 130 comes into contact with the workpiece processing surface W1 at the end of the arrow A1, the control unit C1 moves the cutting tool 130 on the path of the feeding section S as indicated by the arrow A2 and moves the cutting tool 130 relative to the workpiece W. The reciprocating vibration in the machining feed direction is continued, and the cutting of the unmachined part W2 is continued.
In this manner, the control unit C1 controls the vibration unit so as to repeat the operations indicated by the arrows A1 to A4.

The separation feed section which is an operation section from the start end of the arrow A4 where the cutting tool 130 is separated from the workpiece W during the idling motion to the end end of the arrow A1 where the separation from the workpiece W is completed (start end of the arrow A2). The cutting edge 130 of the cutting tool 130 does not contact the workpiece W.
As a result, the load on the cutting edge 131 of the cutting tool 130 can be reduced.
Furthermore, since the cutting oil can easily enter between the cutting edge 131 of the cutting tool 130 and the workpiece W, the effect of the cutting oil can be enhanced.
The end of the arrow A1 that is the contact position of the cutting tool 130 is set between both ends of the path of the feed section S, and the cutting edge 131 of the cutting tool 130 is set to start cutting from the position of the workpiece processing surface W1 that has already been processed. By doing so, it is possible to cut the convex portion generated by the previous machining on the workpiece machining surface W1, and to improve the surface roughness of the workpiece machining surface W1.

In the second embodiment, as shown in FIG. 6, the control unit C1 moves the cutting tool 130 in the direction indicated by the arrow B3 from the end of the arrow B2 where the cutting tool 130 is located in the feed section S when the reciprocating vibration is returned. In this way, the workpiece is moved in a direction away from the workpiece machining surface W1 along the cutting direction to be separated from the workpiece W by a predetermined distance, and the workpiece machining surface W1 along the path of the feeding section S and the cutting direction as indicated by an arrow B1. The cutting edge 130 of the cutting tool 130 is moved to a position where a predetermined cutting amount is cut, and is brought into contact with the workpiece processing surface W1 at the end position of the feeding section S.
When the cutting tool 130 comes into contact with the workpiece machining surface W1 at the end of the arrow B1, the control unit C1 continues the reciprocating vibration in the machining feed direction relative to the workpiece W of the cutting tool 130, thereby Continue cutting.

In this manner, the control unit C1 controls the vibration unit so as to repeat the operations indicated by the arrows B1 to B3.
In the present embodiment, the operation sections indicated by the arrows B3 and B1 are the separate feed sections.
Compared with the operation of the first embodiment, the operation of the present embodiment does not have the operation of the arrow A2 of the first embodiment, so that the contact time between the cutting tool 130 and the workpiece processing surface W1 during the idling operation is shortened. Thus, the load reduction of the cutting edge 131 of the cutting tool 130 can be improved.

The movement of the cutting tool 130 in the direction away from the workpiece processing surface W1 can be performed along the path of the feed section S as indicated by the arrows A4 or B3 shown in the two embodiments, and in the third embodiment. As shown in FIG. 7, when the reciprocating vibration is returned, the cutting tool 130 extends from the end of the arrow D2 positioned in the feed section S along the cutting direction regardless of the path of the feed section S as indicated by the arrow D3. Can be done.
After the cutting tool 130 is separated from the workpiece W by a predetermined distance, the cutting tool 130 is moved toward the workpiece processing surface W1 along the cutting direction as indicated by an arrow D1, and the cutting edge 131 of the cutting tool 130 has a predetermined cutting amount. The workpiece is moved to the cutting position and brought into contact with the workpiece processing surface W1 at the end position of the feeding section S.
When the cutting tool 130 comes into contact with the workpiece machining surface W1 at the end of the arrow D1, the control unit C1 continues reciprocating vibration in the machining feed direction relative to the workpiece W of the cutting tool 130, so that the workpiece unmachined portion W2 Continue cutting.

In this way, the control unit C1 controls the vibration unit so as to repeat the operations indicated by the arrows D1 to D3.
In the present embodiment, the operation section indicated by the arrows D3 and D1 is the separation feed section.
In this embodiment, compared with the operation of the first embodiment and the operation of the second embodiment, the movement amount in the machining feed direction during the idling operation is reduced and the movement time is shortened.

  In the second and third embodiments, by making the end of the arrow B2 or D2 (the start of the arrow B3 or D3) coincide with the start of the feed section S, the separation feed section becomes the same as the feed section S. It can also occupy the whole.

DESCRIPTION OF SYMBOLS 100 ... Machine tool 110 ... Spindle 110A ... Spindle 120 ... Chuck 130 ... Cutting tool 130A ... Cutting tool stand 131 ... Cutting edge 150 ... X-axis direction feed mechanism 151 ... Base 152 ... X-axis direction guide rail 153 ... X-axis direction feed table 154 ... X-axis direction guide 155 ... Linear servo motor 155a ... Movable element 155b ... Stator 160 ... Z-axis direction feed mechanism 161 ... Base 162 ... Z-axis direction guide rail 163 ... Z-axis direction feed table 164 ... Z-axis direction guide 165 ... Linear servo motor 165a ... Mover 165b ... Stator C ... Control device C1 ... Control unit W ... Work W1 ... Workpiece processing surface W2 ... Workpiece Machining spot

Claims (4)

A workpiece holding means for holding a workpiece, a tool post for holding a cutting tool for cutting the workpiece, and a relative movement of the workpiece holding means and the tool rest to feed the cutting tool to the workpiece in a predetermined processing feed direction. A feed means that operates, a vibration means that relatively vibrates the work holding means and the tool post along a machining feed direction, and a rotation means that relatively rotates the work and the cutting tool,
Vibrating means for feeding the cutting tool in the machining feed direction while reciprocatingly oscillating the cutting tool along the machining feed direction by duplicating the cutting part in the forward movement of the reciprocating vibration and the cutting machining part in the backward movement. And the rotation means are linked and driven and controlled,
A machine tool that performs machining of a workpiece by relative rotation between the workpiece and the cutting tool, and a feed operation involving the reciprocating vibration of the cutting tool in the machining feed direction with respect to the workpiece,
Separate feed in which the cutting tool is fed in a state in which the cutting tool and the workpiece are separated from each other within the feed section of the cutting tool in a range where the cutting parts at the time of forward movement and backward movement overlap. A machine tool with a section.   The machine tool according to claim 1, wherein the cutting tool and the workpiece are separated from each other by moving the cutting tool and the workpiece along a cutting direction of the cutting tool.   The configuration in which the separation feed section is set so as to occupy the entire feed section of the cutting tool in a range in which the cutting parts at the time of the forward movement and the backward movement overlap. The machine tool described. A workpiece holding means for holding a workpiece, a tool post for holding a cutting tool for cutting the workpiece, and a relative movement of the workpiece holding means and the tool rest to feed the cutting tool to the workpiece in a predetermined processing feed direction. A machine tool comprising: a feed means that operates; a vibration means that relatively vibrates the workpiece holding means and the tool post along a machining feed direction; and a rotation means that relatively rotates the workpiece and the cutting tool. Provided in
A vibration means for feeding the cutting tool in the machining feed direction while causing the cutting tool to reciprocate along the machining feed direction by overlapping the cutting process portion in the forward movement of the reciprocating vibration and the cutting machining portion in the backward movement. Drive control in conjunction with the rotation means,
By the relative rotation between the workpiece and the cutting tool and the feed operation accompanied by the reciprocating vibration of the cutting tool in the machining feed direction with respect to the workpiece, a cutting process portion during the forward movement in the machining feed direction, A machine tool control device that executes workpiece processing so that the cutting portion during movement overlaps,
Separate feed in which the cutting tool is fed in a state in which the cutting tool and the workpiece are separated from each other within the feed section of the cutting tool in a range where the cutting parts at the time of forward movement and backward movement overlap. Machine tool control device with a section.