JP6727190B2 - Machine tool and control device for this machine tool - Google Patents

Description

The present invention relates to a machine tool for machining a workpiece while sequentially cutting chips during cutting and a control device for the machine tool.

Conventionally, a work holding means for holding a work, a tool rest for holding a cutting tool for cutting the work, and a relative movement of the work holding means and the tool rest to determine the cutting tool with respect to the work. Of the feed means for feeding in the machining feed direction, and the work holding means and the tool rest relatively vibrate so that the cutting tool is fed in the machining feed direction while reciprocally vibrating along the machining feed direction. There is known a machine tool including a vibrating unit that causes the work and a rotating unit that relatively rotates the work and the cutting tool (for example, see Patent Document 1).
The control device of this machine tool drives and controls the rotating means, the feeding means, and the vibrating means, and the relative rotation between the work and the cutting tool, and the machining feed direction of the cutting tool with respect to the work. The machine tool is caused to perform machining of the workpiece by the feeding operation accompanied by 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 work while the work is being machined while reciprocally vibrating the cutting tool in the machining feed direction, so that the cutting edge of the cutting tool may be loaded. there were.

Therefore, the present invention is to solve the above-mentioned problems of the prior art, that is, an object of the present invention is to divide a chip and reduce the load of a cutting tool, and a control of this machine tool. It is to provide a device.

In the invention according to claim 1, a work holding means for holding a work, a tool rest for holding a cutting tool for cutting the work, and cutting relative to the work by relative movement of the work holding means and the tool rest. A feeding means for feeding the tool in a predetermined machining feed direction, a vibrating means for relatively reciprocally vibrating the work holding means and the tool rest along the machining feed direction, and the work and the cutting tool relative to each other. And a rotating means for rotating, wherein the cutting processing portion at the time of forward movement of the reciprocating vibration and the cutting processing portion at the time of returning movement are overlapped, and vibration cutting is performed to cause the cutting tool to reciprocally vibrate along the processing feed direction. The vibration means and the rotation means are drive-controlled in cooperation with each other so as to feed in the machining feed direction while performing, relative rotation between the work and the cutting tool, and the machining tool in the machining feed direction with respect to the work. A machine tool for performing machining of a work by a feed operation accompanied by reciprocating vibration, wherein the machining section in the forward movement and the backward movement during the vibration cutting overlaps within the feed section of the cutting tool. The above-described problem is solved by providing a separation feed section in which the cutting tool is fed in a state where the cutting tool and the work are separated from each other.

In addition to the configuration of the machine tool described in claim 1, the invention according to claim 2 moves the cutting tool and the workpiece along a cutting direction of the cutting tool, thereby cutting the cutting tool. The above-mentioned problems are further solved by adopting a configuration in which the work and the work are separated from each other.

In the invention according to claim 3, in addition to the configuration of the machine tool according to claim 1 or claim 2, the separated feed section overlaps with a cutting portion during the forward movement and during the backward movement. The above-mentioned problem is further solved by adopting a configuration in which it is set so as to occupy the entire feed section of the cutting tool in the range.

In the invention according to claim 4, a work holding means for holding a work, a tool rest for holding a cutting tool for cutting the work, and cutting relative to the work by relative movement of the work holding means and the tool rest. A feeding means for feeding the tool in a predetermined machining feed direction, a vibrating means for relatively reciprocally vibrating the work holding means and the tool rest along the machining feed direction, and the work and the cutting tool relative to each other. The cutting tool is provided in a machine tool provided with a rotating means for rotating, and the cutting processing portion at the time of forward movement of the reciprocating vibration and the cutting processing portion at the time of returning movement are overlapped to move the cutting tool along the processing feed direction. Driving and controlling the vibrating means and the rotating means in cooperation with each other so as to feed in the machining feed direction while performing reciprocating vibration vibration cutting, relative rotation between the work and the cutting tool, and the machining of the cutting tool with respect to the work. A machine tool that performs machining of a workpiece by a feeding operation accompanied by the reciprocating vibration in the feeding direction so that a cutting portion in the forward movement in the machining feeding direction and a cutting portion in the backward movement overlap with each other. A control device, in a state in which the cutting tool and the work are separated from each other within the feed section of the cutting tool in a range in which the cutting portions during the forward movement and the backward movement during the vibration cutting overlap. The above-mentioned problem is solved by providing the separated feed section in which the cutting tool is fed.

According to the machine tool of the invention according to claim 1, the cutting tool and the work are separated from each other within the feed section of the cutting tool in a range in which the cutting portions during the forward movement and the backward movement overlap. In this state, a separation feed section is provided in which the cutting tool is fed, and the cutting tool and the work are separated in the separation feed section, and the cutting tool is not in contact with the work, so that chips are divided. The load on the cutting tool can be reduced without disturbing the cutting process.

According to the machine tool of the invention of claim 2, in addition to the effect of the invention of claim 1, the cutting tool and the work are separated from each other, the cutting tool and the work are separated from each other, 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 achieved by the invention according to claim 1 or 2, in the range in which the cutting portions during the forward movement and the backward movement overlap each other. Since the cutting tool does not come into contact with the work over the entire feed section of the cutting tool, it is possible to prevent an adverse effect due to the contact between the cutting tool and the work on the work surface.

According to the machine tool control apparatus of the invention according to the fourth aspect, the same effect as that of the invention according to the first aspect can be obtained in the machine tool control apparatus.

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 reciprocating vibration of a Z-axis direction of a cutting tool of 1st Example of this invention, and a position. The figure which shows the relationship of the spindle nth rotation of a 1st Example of this invention, the n+1th rotation, and the n+2nd rotation. The figure which shows the operation example of the vibration of the Z-axis direction and the 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 the 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 the X-axis direction of 3rd Example of this invention.

A machine tool of the present invention and a control device for this machine tool separate a cutting tool and a workpiece in a cutting tool feed section in a range where cutting portions during forward movement and backward movement during vibration cutting overlap. In the state where the cutting tool is fed, the separated feed section is provided to cut the chips and prevent the cutting tool from coming into contact with the work while the cutting tool is separated from the work. Any specific embodiment may be used as long as it reduces the load.

FIG. 1 is a schematic diagram 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 spindle 110 as a rotating means and a cutting tool stand 130A as a tool rest.
A chuck 120 as a work holding means is provided at the tip of the main shaft 110.
The work W is held on the spindle 110 via the chuck 120.
The spindle 110 is supported by a headstock 110A so as to be rotationally driven by the power of a spindle motor (not shown).

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

The Z-axis feed mechanism 160 includes a base 161 that is integral with the fixed side of the Z-axis feed mechanism 160 such as the bed, and a Z-axis guide rail 162 provided on the base 161 and extending in the Z-axis direction. There is.
A Z-axis feed table 163 is slidably supported on the Z-axis guide rail 162 via a Z-axis 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 110A is mounted on the Z-axis direction feed table 163, and the Z-axis direction feed table 163 is moved and driven in the Z-axis direction by driving the linear servomotor 165.
The headstock 110A moves in the Z-axis direction by the movement of the Z-axis direction feed table 163, and the spindle 110 moves in the Z-axis direction.

A cutting tool 130 such as a cutting tool for turning the work W is mounted on the cutting tool base 130A.
The cutting tool base 130A is provided on the bed side of the machine tool 100 by the X-axis direction feed mechanism 150 and a Y-axis direction feed mechanism (not shown), the X-axis direction orthogonal to the Z-axis direction, the Z-axis direction and the 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 rest moving mechanism that moves the cutting tool rest 130A in the X-axis direction and the Y-axis direction with respect to the spindle 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 provided on the base 151 and extending in the X-axis direction.
An X-axis direction feed table 153 is slidably supported by an 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 moved and driven in the X-axis direction.
Note that the Y-axis direction feed mechanism has the X-axis direction feed mechanism 150 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 base 130A is mounted on an 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 performs the same operation as the X-axis direction feed mechanism 150 in the Y-axis direction. Moves in the Y-axis direction.

A Y-axis feed mechanism (not shown) may be mounted on the bed side via the X-axis feed mechanism 150, and the cutting tool table 130A may be mounted on the Y-axis feed mechanism side. Since the structure for moving the cutting tool table 130A 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 thereof will be omitted.

The tool post moving mechanism (the X-axis direction feed mechanism 150 and the Y-axis direction feed mechanism) and the main-axis moving mechanism (Z-axis direction feed mechanism 160) cooperate to form the X-axis direction feed mechanism 150 and the Y-axis direction feed mechanism. The cutting tool base 130A is mounted on the cutting tool base 130A by the movement of the cutting tool base 130A in the X-axis direction and the Y-axis direction and the movement of the headstock 110A (main shaft 110) in the Z-axis direction by the Z-axis feed mechanism 160. The cutting tool 130 is fed relative to the work W in an arbitrary machining feed direction.

As shown in FIG. 2, by feeding the cutting tool 130 in an arbitrary machining feed direction relative to the work W by a feed means composed of the spindle moving mechanism and the tool rest moving mechanism, as shown in FIG. The W is cut into an arbitrary shape by the cutting tool 130.

In the present 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 rest movement is performed. 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 includes a tool rest 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 with respect to the main shaft 110 that is rotationally driven. By moving the cutting tool base 130A, the cutting tool 130 can be processed and fed to the work W.

Further, the cutting tool base 130A is fixed so as not to move to the bed side of the machine tool 100, and the spindle moving mechanism is configured to move the spindle stock 110A in the X-axis direction, the Y-axis direction, and the Z-axis direction. Good.
In this case, the feeding means includes a headstock moving mechanism that moves the headstock 110A in the X-axis direction, the Y-axis direction, and the Z-axis direction, and the headstock is different from the headstock of the cutting tool stand 130A that is fixedly positioned. By moving 110A, the cutting tool 130 can be operated to feed the work W.
Further, in the present embodiment, the work W is rotated with respect to the cutting tool 130, but 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 drive-controlled by a controller C1 included in the controller C.
The control unit C1 controls each feed mechanism as a vibrating means to move the headstock 110A or the cutting tool base 130A in each direction while reciprocally vibrating along the corresponding movement direction.

Under the control of the controller C1, each feed mechanism moves the spindle 110 or the cutting tool base 130A forward (forward) by a predetermined forward amount in one reciprocating vibration, and then moves the predetermined amount. By a backward movement amount (backward movement), and a moving amount of the difference is moved in each movement direction, and the cutting tool 130 is fed to the work W in the machining feed direction in cooperation with each other.

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

In the state where the work W is rotated, the headstock 110A (spindle 110) or the cutting tool base 130A (cutting tool 130) moves while reciprocally oscillating, and the work W is contour-cut into a predetermined shape by the cutting tool 130. In this case, the peripheral surface of the work W is cut into a sinusoidal shape as shown in FIG.
In the imaginary line (one-dot chain line) passing through the valley of the sinusoidal waveform, the amount of change in position when the spindle phase changes from 0° to 360° indicates the feed amount.
As shown in FIG. 4, the vibration frequency N of the headstock 110A (spindle 110) or the cutting tool base 130A per rotation of the work W is 3.5 times (frequency N=3.5) as an example. To do.

In this case, the lowest point of the valley of the phase of the work peripheral surface shape to be turned by the cutting tool 130 at the (n+1)th rotation (n is an integer of 1 or more) (the dotted line waveform that is the point most cut in the feed direction by the cutting tool 130). The position of the peak of the peak of the graph is relative to the position of the lowest point of the valley of the phase of the shape turned by the cutting tool 130 at the n-th rotation (the peak of the peak of the solid waveform graph) in the main axis phase direction (of the graph). It shifts in the horizontal axis direction).

As a result, a part of the cutting tool 130 when the cutting tool moves forward and a part of the cutting tool when returning part partially overlaps with each other. During the vibration cutting, the cutting tool 130 passes over the machined surface, which is the machined part of the work W, in the machining feed direction, so that the idling motion of not cutting the work W occurs.
The chips generated from the work W during cutting are sequentially divided by the idling operation.
The machine tool 100 can smoothly perform the outer shape cutting process of the work W while dividing the chips by the reciprocating vibration along the cutting feed direction of the cutting tool 130.

When the chips are sequentially divided by the reciprocating vibration of the cutting tool 130, the cutting portion at the (n+1)th rotation of the work peripheral surface may include the portion already cut at the nth rotation.
In other words, the trajectory of the cutting tool 130 at the time of the n+1th rotation (n is an integer of 1 or more) of the work peripheral surface at the time of the backward movement should reach the trajectory of the cutting tool 130 at the nth rotation of the workpiece peripheral surface.
As shown in FIG. 4, the phase of the shape to be turned by the cutting tool 130 on the work W at the n+1th rotation and the work at the nth rotation does not necessarily need to be inverted 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 such that one rotation of the work W causes less than one vibration (0<frequency N<1.0).
In this case, the main shaft 110 rotates for one rotation or more for one vibration.

In the machine tool 100, the operation command from the control unit C1 is issued for each predetermined command time unit.
The reciprocating vibration of the headstock 110A (spindle 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 capable of sending a command 250 times per second by the control unit C1, the operation command by the control unit C1 is performed in 1÷250=4 (ms) cycle (each command time unit). Be seen.

The control unit C1 of the present embodiment, the workpiece machining surface W1 which is the machined surface of the workpiece W by the cutting tool 130 along the cutting direction during the idling operation during the vibration cutting with a predetermined cutting amount with respect to the workpiece W. It is reciprocally oscillated so as to be separated from.
For example, when the machining feed direction is the Z-axis direction, the cutting tool 130 is reciprocally oscillated in the X-axis direction, which is the radial direction of the workpiece, so as to separate from the workpiece machining surface W1 that is the machined surface of the workpiece W during the idling operation.
That is, the cutting tool 130 is fed in the feeding section S of the cutting tool 130 in a range where the cutting portions in the forward movement and in the backward movement overlap, with the cutting tool 130 and the work W being separated from each other. It is configured to provide a separate feed section.

As shown in FIG. 5, from the end of the arrow A3 where the cutting tool 130 is located in the feed section S when the reciprocating vibration is returned, the control unit C1 moves the cutting tool 130 to the feed section S as indicated by the arrow A4. Within the range of the idling motion of the workpiece along the cutting direction in a direction away from the work surface W1 to separate a predetermined distance from the work W, and along the cutting direction as shown by arrow A1 to the work surface W1. The cutting edge 131 of the cutting tool 130 is moved toward a position where a predetermined cutting amount is cut, and is brought into contact with the work surface W1 at a predetermined position on the path of the feed section S.
When the cutting tool 130 comes into contact with the workpiece machining surface W1 at the end end of the arrow A1, the control unit C1 moves the cutting tool 130 on the path of the feed section S as indicated by an arrow A2 to move the workpiece relative to the workpiece W. Reciprocating vibration in the machining feed direction is continued to continue cutting the workpiece unmachined portion W2.
In this way, the control unit C1 controls the vibrating means so as to repeat the operations shown 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 separates from the work W during the idling operation to the end end of arrow A1 (start end of arrow A2) where separation of the work W is completed. The cutting edge 131 of the cutting tool 130 does not contact the work 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 work W, the effect of the cutting oil can be enhanced.
The end of the arrow A1, which 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 of the cutting tool 130 is set to start cutting from the position of the already machined work surface W1. By doing so, it is possible to cut the convex portion generated by the previous machining on the work surface W1 and improve the surface roughness of the work surface W1.

In the second embodiment, as shown in FIG. 6, the control unit C1 moves the cutting tool 130 to the arrow B3 from the end end of the arrow B2 where the cutting tool 130 is located in the feed section S when the reciprocating vibration is returned. Is moved in a direction away from the work surface W1 along the cutting direction so as to be separated from the work W by a predetermined distance, and along the path of the feed section S and the cutting direction W1 along the cutting direction as indicated by an arrow B1. Toward, the cutting edge 131 of the cutting tool 130 is moved to a position where a predetermined cutting amount is cut, and is brought into contact with the work surface W1 at the position of the end end of the feed section S.
When the cutting tool 130 contacts the workpiece machining surface W1 at the end end of the arrow B1, the control unit C1 continues the reciprocating vibration of the cutting tool 130 in the machining feed direction relative to the workpiece W, and causes the workpiece unmachined portion W2 to move. Continue cutting.

In this way, the control unit C1 controls the vibrating means so as to repeat the operations shown by the arrows B1 to B3.
In this embodiment, the operation section indicated by the arrow B3 and the arrow B1 is the separated feed section.
The operation of the present embodiment does not have the operation of the arrow A2 of the first embodiment as compared with the operation of the first embodiment, and therefore the contact time between the cutting tool 130 and the work surface W1 during the idling operation is shortened. Therefore, the load on the cutting edge 131 of the cutting tool 130 can be reduced.

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

In this way, the control unit C1 controls the vibrating means so as to repeat the operations shown by the arrows D1 to D3.
In this embodiment, the operation section indicated by the arrow D3 and the arrow D1 is the separated feed section.
In this embodiment, as 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 smaller and the movement time is shorter.

In the second and third embodiments, by making the end end of the arrow B2 or D2 (start end of the arrow B3 or D3) coincide with the start end of the feed section S, the separated feed section can be set to the feed section S It can be made to occupy the whole.

100 ・・・ Machine tool 110 ・・・ Spindle 110A ・・・ Spindle stock 120 ・・・ Chuck 130 ・・・ Cutting tool 130A ・・・ Cutting tool base 131 ・・・ Blade tip 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 ・・・ Mover 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... Workpiece W1... Workpiece machining surface W2... Workpiece unmachined part

Claims (4)

A work holding means for holding a work, a tool rest for holding a cutting tool for cutting the work, and a relative movement of the work holding means and the tool rest to feed the cutting tool in a predetermined machining feed direction. A feed means for operating, a vibrating means for relatively reciprocally vibrating the work holding means and the tool rest along a machining feed direction, and a rotating means for relatively rotating the work and the cutting tool,
The cutting part during the forward movement of the reciprocating vibration and the cutting part during the backward movement are overlapped, and the cutting tool is fed in the machining feeding direction while performing the vibration cutting in which the cutting tool reciprocally vibrates along the machining feeding direction. In addition, the vibrating means and the rotating means are linked and drive-controlled,
A machine tool which executes 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,
In the feed section of the cutting tool in the range where the cutting portions during the forward movement and the backward movement during the vibration cutting overlap, the cutting tool is fed while the cutting tool and the work are separated from each other. A machine tool configured to provide a separated feed section to be operated. The machine tool according to claim 1, wherein the cutting tool and the work are moved along a cutting direction of the cutting tool to separate the cutting tool and the work. 3. The separation feed section is configured so as to occupy the entire feed section of the cutting tool in a range in which the cutting portion at the time of the forward movement and the cutting processed portion at the time of the backward movement overlap. Machine tool described. A work holding means for holding a work, a tool rest for holding a cutting tool for cutting the work, and a relative movement of the work holding means and the tool rest to feed the cutting tool in a predetermined machining feed direction. Work including a feed means for operating, a vibrating means for relatively reciprocally vibrating the work holding means and the tool rest in the machining feed direction, and a rotating means for relatively rotating the work and the cutting tool Installed on the machine,
The cutting part during the forward movement of the reciprocating vibration and the cutting part during the backward movement are overlapped, and the cutting tool is fed in the machining feeding direction while performing the vibration cutting in which the cutting tool reciprocally vibrates along the machining feeding direction. In order to drive and control the vibration means and the rotation means in cooperation with each other,
By the relative rotation between the work and the cutting tool, and the feeding operation involving the reciprocating vibration of the cutting tool in the machining feed direction with respect to the work, a cutting portion at the time of forward movement in the machining feed direction, A control device for a machine tool that executes machining of a work so that a cutting portion during movement overlaps,
In the feed section of the cutting tool in the range where the cutting portions during the forward movement and the backward movement during the vibration cutting overlap, the cutting tool is fed while the cutting tool and the work are separated from each other. A machine tool control device configured to provide a separated feed section to be operated.