JP2015196198A - Tool vibration device for plane machining - Google Patents

Abstract

The present invention provides a tool vibration device for cutting chips for flat machining of a workpiece end face.
A tool vibration device 20 that reciprocally vibrates a tool rest 2 to which a tool 1 is fixed in a rotation direction so as to advance and retreat along a feed direction, the tool rest 2 being fixed, and a rotary slide 3; A slide base 4 on which the rotary slide 3 is rotatably mounted around a rotary shaft 6 orthogonal to the feed direction and an eccentric cam 9 which is rotationally driven are brought into contact with the rotary slide 3 to thereby rotate the slide. And an eccentric cam vibration mechanism H that reciprocally vibrates 3 around the rotation shaft 6.
[Selection] Figure 4

Description

  The present invention relates to a tool vibration device for planar processing that vibrates a tool and cuts chips.

  Up to now, when cutting a steel, stainless steel, or aluminum workpiece with a tool such as an outer diameter tool or a boring bar on an NC lathe of a machine tool, as shown in FIG. Powder is generated and long chips wrap around the workpiece, tool post, tool, etc. For this reason, since it takes time to discharge the wound chips, the machine stop time is prolonged, and the operating rate of the machine is reduced. An apparatus was developed (see, for example, Patent Document 1).

JP 2012-45693 A (FIG. 4)

  However, the conventional tool vibration device can be used only for the outer diameter machining in the axial direction by the outer diameter cutting tool and the inner diameter machining in the axial direction by the inner diameter boring bar. There has been a problem that a tool vibration device for use does not yet exist.

  Therefore, the present invention has been made in view of these problems, and provides a tool vibration device that shortens and discharges chips generated by flat machining such as end face machining in turning using an NC lathe or the like. This is the issue.

The invention of the tool vibration device (20) for machining the end face according to claim 1 causes the tool post (2) to which the tool (1) is fixed to reciprocate in the rotational direction so as to advance and retreat along the feed direction. A tool vibration device (20) for plane machining, wherein a rotating slide (3) to which the tool post (2) is fixed,
A slide base (4) that rotatably supports the rotary slide (3) about a rotary shaft (6) orthogonal to the feed direction, and an eccentric cam (9) that is driven to rotate are provided as the rotary slide. An eccentric cam vibration mechanism (H) that abuts on (3) and reciprocally vibrates the rotation slide (3) around the rotation shaft (6) is provided.

  Invention of Claim 2 is the tool vibration apparatus (20) for plane processing of Claim 1, Comprising: The vibration direction of the blade edge | tip of the said tool (1) is the time of the end surface processing of a workpiece | work (W). Oscillating in a direction from the outer periphery to the center of the workpiece (W).

  A third aspect of the present invention is the planar processing tool vibration device (20) according to the first aspect, wherein the rotary shaft (6) is driven to rotate the eccentric cam (9). The ratio of the distance L2 from the rotating shaft (6) to the cutting edge of the flat working tool 1a with respect to the distance L1 up to 8a) is 1: 1.

According to the first aspect of the present invention, the tool vibration device for plane machining is rotatable about the rotary slide to which the tool post 2 is fixed and the rotary shaft perpendicular to the feed direction. By providing a slide base to be supported and an eccentric cam vibration mechanism in which a rotationally driven eccentric cam is brought into contact with the rotational slide to reciprocately vibrate the rotational slide about the rotational axis. Since the feed can be applied while vibrating the tool toward the center, long chips can be cut short during the planar processing of the end face.
Further, since vibration is generated by the eccentric cam vibration mechanism including the rotation slide, the rotation shaft, and the eccentric cam, an inexpensive tool vibration device for plane machining can be provided. Furthermore, it is possible to provide a tool vibration device for plane machining that can reduce the size and space of the tool vibration device.

  According to the second aspect of the present invention, the vibration direction of the tool vibrates in the direction from the outer periphery of the workpiece toward the center during the flat machining of the end surface of the workpiece, and further feed is applied. can do.

  According to the invention of claim 3, by setting L1: L2 = 1: 1, the magnitude of the vibration generated by the eccentric amount of the eccentric cam is the same as that of the cutting edge of the flat surface machining tool at the end face. Can be reproduced with amplitude.

It is a top view of NC lathe equipped with the tool vibration device for end face processing of the present invention. It is a front view of NC lathe equipped with the tool vibration device for end face processing of the present invention. It is the top view to which the tool vibration device for end face processing of the present invention was expanded. It is sectional drawing of the AA line shown in FIG. 3, expanding the tool vibration apparatus for end surface processing of this invention. It is sectional drawing of the BB line which expands the tool vibration apparatus for end surface processing of this invention, and is shown in FIG. It is sectional drawing which shows the shape of the eccentric cam which assembled | attached the set screw. (A) is a plan view showing a state where the work is fixed to the collet chuck and end face machining, (b) is a side view of (a), (c) is a locus of the cutting edge of an end face machining tool, and workpiece W It is explanatory drawing which shows the locus | trajectory for 2 rotations. (A) is a photograph which shows the conventional long chip, (b) is a photograph which shows the short chip cut | disconnected by starting the tool vibration apparatus of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, a machine tool 30 equipped with the end face machining tool vibration device 20 of the present invention is, for example, a thin disk-shaped steel material or other metal in which a through hole is formed at the center. Suitable for a workpiece W made of material (see FIG. 7B) having its inner diameter gripped by a collet chuck 12b and further fixed to the front surface of the collet chuck 12b by a plurality of bolts 12d for end surface processing. It is.
The machine tool 30 is an NC lathe here, but may be another machine tool. A headstock 12 covered with a cover is disposed on the left side of the upper surface of the bed 11, a collet chuck 12b is mounted on the spindle 12a of the headstock 12, and the inner diameter of the workpiece W is gripped by the collet 12c of the collet chuck 12b. The workpiece W is fixed to the collet chuck 12b by a plurality of bolts 12d (see FIGS. 7A and 7B).
On the bed 11 (upper right side surface) on which the headstock 12 is placed, slide guides (sliding surfaces) 11a and 11a are provided, and a saddle 22 movable in the left and right (Z axis) direction is placed. A cross slide 32 movable in the front-rear direction (X-axis) is placed on the sliding surface provided on the upper surface of the saddle 22, and the planar processing of the present invention is performed on the upper surface of the cross slide 32. A tool vibration device 20 is mounted.

As shown in FIG. 1, the machine tool 30 is a two-axis (Z, X) controlled NC lathe and has a comb-shaped tool post 2.
Note that symbols indicating the coordinate system of the machine tool 30 are defined in JIS B6310. For the NC lathe, the axial direction of the main shaft 12a is the Z axis, and the direction orthogonal to the Z axis and parallel to the floor is the X axis.
The 2 (Z, X) axes of the machine body are moved by the Z axis moving mechanism and the X axis moving mechanism.
Since the Z-axis moving mechanism and the X-axis moving mechanism are configured by a known mechanism using a servo motor, a ball screw, and a nut, detailed description thereof is omitted.

<Configuration of Tool Vibration Device 20 for End Face Processing>
The configuration of the tool vibration device 20 for end face machining of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 4, the tool vibration device 20 for plane machining includes a tool post 2 to which the tool 1 is fixed, and a rotary slide 3 to which the tool post 2 is fixed and is rotatable about a rotary shaft 6. And a slide base 4 that is provided on the lower surface of the rotary slide 3 and supports the rotary slide 3.
Further, a base 5 provided on the lower surface of the slide base 4 and fixed to the upper surface of a cross slide 32 (see FIG. 2), which is a main body of the machine tool 30, and a block 7 fixed to the upper surface of the other end of the slide base 4. The motor 8 is disposed on the upper surface of the block 7 and provided with the rotary shaft 8a facing downward, and the eccentric cam 9 is fixed to the rotary shaft 8a of the motor 8 and vibrates the rotary slide 3. .
Furthermore, the plate 3a is fixed to the recess 3g at the other end (right) of the rotating slide 3, and the eccentric cam 9 is fitted in the groove 3b (see FIG. 5) of the plate 3a.

<Configuration of tool 1>
As shown in FIGS. 3 and 4, the tool 1 is an end face machining tool 1 a that planarizes the end face of the workpiece W, and is disposed on the tool post 2.
As shown in FIG. 3, the end face machining tool 1 a is set in a groove 2 a formed so as to be orthogonal to the end face of the workpiece W, and is fixed to the tool post 2 by bolts. The end face machining tool 1a corresponds to various tools for roughing, thinning and finishing.
The end face machining tool 1 a is arranged orthogonal to the central axis of the rotation shaft 6.
The arrangement of the end face machining tool 1a is not limited to this, and the L-shaped tool body is fixed to the tool post parallel to the central axis of the rotating shaft 6 so that the tip of the tool is fixed. Similarly to the end face processing tool 1a, the end face of the workpiece W may be brought into contact with the end face at a right angle.

<Configuration of tool post 2>
As shown in FIG. 3 and FIG. 4, the tool post 2 is for the end face cutting tool 1a, and the tool protrusion length 1 is set to 30 mm, which is 1.5 times the size □ 20 mm of the end face processing tool 1a. Then, as shown in FIG. 5, the ratio of L1: L2 can be set to exactly 1: 1.

<Configuration of the rotating slide 3>
As shown in FIG. 5, the rotating slide 3 is formed in a rectangular shape in plan view. In the center of the rotating slide 3, a rotating shaft 6 serving as a pivot for the rotating slide 3 is disposed, and the tool post 2 is fixed to the left side of one end thereof. The rotating slide 3 is a rotating member that rotates about the rotating shaft 6. However, the rotating displacement amount is as small as 0.2 mm and the number of rotations is as high as 3900 times per minute. It is a vibrating member that vibrates rather than a moving member. A cylindrical low friction sliding member 3e (see FIG. 4) is mounted in a gap between the outer peripheral surface of the rotating shaft 6 and the through hole of the rotating slide 3 that passes through the rotating shaft 6. Further, a flat low friction sliding member 3 e is mounted between the rotating slide 3 and the slide base 4.
As shown in FIG. 5, the rotating slide 3 rotates about the rotating shaft 6, so that the end surface processing tool 1 a mounted on the rotating slide 3 and fixed to the tool post 2 is rotated. Vibrate.
For example, it is 0.1 mm in the cutting direction and 0.1 mm in the escape direction, and vibrates while drawing a small amount of arc. The conventional vibration is a linear vibration that is parallel to the feed direction, whereas the end face machining tool vibration device 20 is an unprecedented arc vibration. Since the cut of the arc is reduced by the vibration of the arc, the cutting becomes soft, the vibration accompanying the cutting can be suppressed, and the noise can be suppressed.

<Configuration of plate 3a>
As shown in FIG. 5, the outer shape of the plate 3 a forms a rectangle, and the left end portion of the plate 3 a is inserted and fixed in a recess 3 g provided at the right end portion of the rotating slide 3. A substantially U-shaped groove 3b or a substantially horseshoe-shaped groove 3b is formed at the right end of the plate 3a, and the outer diameter of the eccentric cam 9 is fitted in the groove 3b. Contact points a and b between the groove 3b of the plate 3a and the outer peripheral surface 9a of the eccentric cam 9 are formed on both sides of the groove 3b of the plate 3a.
In addition to this, the shape of the groove 3b for receiving vibration from the eccentric cam 9 and transmitting it to the tool 1 may be Y-shaped, H-shaped, X-shaped, V-shaped, or the like. Further, the shape is not limited to the groove shape, and may be an elliptical hole, a square hole, or a polygonal hole including a hexagon. Further, since the groove 3b of the plate 3a contacts the eccentric cam 9 at a high speed, heat treatment of hardness HRc 58-60 is applied to improve wear resistance so that the contact portion is not worn.

<Configuration of slide base 4>
As shown in FIG. 5, the slide base 4 is larger than the rotating slide 3 of the vibration member, and is formed in a rectangular shape in plan view.
A rotating slide 3 is placed on the left (main axis) side of the upper surface of the slide base 4, and a motor 8 is disposed on the right side of the upper surface of the slide base 4 via a block 7.
Further, the rotating shaft 6 is lubricated with the lubricating oil supplied from the lubricating hole 3f (see FIG. 4), and the lubricating oil further enters the lower part and makes contact between the rotating slide 3 and the slide base 4. The plate-like low friction sliding member 3e provided on the surface is lubricated.

<Configuration of base 5>
As shown in FIG. 5, the base 5 is the lowermost base member of the tool vibration device 20 for plane machining, and is slightly larger than the slide base 4 and is formed in a rectangular shape in plan view.
On the base 5, the slide base 4 is mounted, and is integrally formed by a T nut and a bolt inserted into a T groove provided on the upper surface of a cross-clad 32 (see FIG. 4) that is a main body of the machine tool 30. It is fixed.

<Configuration of rotating shaft 6>
As shown in FIG. 4, the rotation shaft 6 serves as a fulcrum when the rotation slide 3 rotates (vibrates). The rotating shaft 6 forms a flange portion 6 a having a shape whose upper end portion has an enlarged diameter, a screw portion 6 b is provided at the lower end portion, and is fitted into the through holes of the rotating slide 3 and the slide base 4. A thrust washer, which is a disk-shaped low friction sliding member 3e, is inserted into the lower surface of the flange portion 6a of the rotating shaft 6, and a cylindrical low friction sliding member is further provided below the flange portion 6a. A liner 3e is inserted. The rotating shaft 6 has the rotating slide 3 and the slide base 4 held between nuts 3n.
Accordingly, the screw portion 6 b and the nut 3 n of the rotating shaft 6 protrude from the lower surface of the slide base 4, and this protruding portion is stored in a recess 5 a provided on the upper surface of the base 5.

<Configuration of block 7>
As shown in FIG. 4, the block 7 is a motor support member that is placed on the upper right side of the slide base 4 and supports the motor 8 that is a drive device.
The block 7 erects the rotating shaft 8a of the motor 8 downward, supports the flange portion 8c of the motor 8, and further supports the tip of the rotating shaft 8a with a fitted bearing 8e.

<Configuration of Drive Device 8>
As shown in FIG. 4, the driving device 8 is a three-phase AC induction motor (hereinafter referred to as a motor 8). The motor 8 is arranged in an upright state in which a rectangular flange portion 8 c is fixed to the upper surface of the block 7 by four bolts 8 b and protrudes downward from the flange portion 8 c of the motor 8.
On the outer periphery of the motor shaft 8a, only one surface is D-cut for fixing a set screw 9d for fixing the eccentric cam 9.
The predetermined rotation speed of the motor 8 is preferably set to a higher rotation speed than the rotation speed of the main shaft 12a (see FIG. 2), thereby cutting the chips one or more times per rotation. As an example, the rotational speed 450Min ^-1 of the main shaft 12a, the rotational speed 3900Min ^-1 of the motor 8, Then, the frequency of the tool becomes 3900cpm (cycle / min) of the same number.
As a result, the chips can be cut into one or more 8 times per one rotation of the workpiece, and the chips are short, so that the winding of the chips around the workpiece, tool post, tool, etc. can be prevented. The powder discharge processing work becomes unnecessary, and the reduction in the operating rate of the machine can be suppressed.

<Configuration of eccentric cam 9>
The eccentric cam vibration mechanism H is a mechanism in which the eccentric cam 9 that is rotationally driven is brought into contact with the groove 3 b of the plate 3 a of the rotating slide 3 to reciprocately vibrate the rotating slide 3 around the rotating shaft 6.
As shown in FIG. 4, the eccentric cam 9 is inserted and fixed to the rotating shaft 8 a of the drive device (motor) 8.
As shown in FIG. 6, a through hole 9a is provided at the center of the eccentric cam 9, and a rotating shaft 8a of a driving device (motor) 8 is inserted into the through hole 9a and fixed by a set screw 9d.
The eccentric cam 9 is formed in a cylindrical shape, and the lower half makes the outer peripheral surface 9b eccentric. The outer peripheral surface 9b of the lower half has a cam function, and a desired high hardness is given by heat treatment, and the surface roughness is made minute to give a mirror finish. In addition, three oil sump grooves 9c are formed on the lower outer peripheral surface 9b of the eccentric cam 9.
The eccentric amount c of the eccentric cam 9 is 0.1 mm. The amount of eccentricity c is processed by decentering the central outer peripheral surface 9b by 0.1 mm with respect to the cylindrical central axis o. Therefore, when the eccentric cam 9 makes one rotation, a deflection of 0.2 mm, which is twice the eccentric amount c, occurs. As a result, this vibration becomes vibration due to high-speed rotation, and the cutting edge of the tool 1 is vibrated to repeat generation of chips and cutting of chips.

<Lubrication method of plate 3a and eccentric cam 9>
As shown in FIG. 5, the lubrication at points a and b where the plate 3a having the substantially U-shaped groove 3b and the eccentric cam 9 come into contact receives lubrication oil from a lubrication oil pump (not shown) to the oil supply port 7c. Do it. A felt insertion groove 7d is provided in the vicinity of the fuel filler port 7c. The felt insertion groove 7d is provided with a felt 7a which is an oil-containing member formed in a suitable size, for example, 17 mm × 17 mm × 5 mm.
When the lubricating oil is supplied from the lubricating oil pump, the felt 7a is filled with the lubricating oil. The felt 7a filled with the lubricating oil is in contact with the outer peripheral surface 9b of the eccentric cam 9, and applies the outer peripheral surface 9b of the eccentric cam 9 with the lubricating oil each time the eccentric cam 9 rotates. Excess lubricating oil is stored in three oil sump grooves 9c (see FIG. 6).
As a result, the contact points a and b of the plate 3a that contacts the outer peripheral surface 9b of the eccentric cam 9 are always applied and lubricated with the lubricating oil. As a result, the contact points a and b between the plate 3a and the eccentric cam 9 can be prevented from galling by forming an oil film with the lubricating oil.

<Operation of Tool Vibration Device 20>
As shown in FIG. 4, when the eccentric cam 9 is rotated once by the rotation of the motor 8, the tool vibration device 20 for flat surface (end face) machining has an outer periphery of the eccentric cam 9 of 0.1 mm as shown in FIG. Therefore, the amplitude is 0.2 mm, which is the sum of the shake +0.1 mm and the shake −0.1 mm, and is transmitted to the plate 3 a and rotated around the rotation shaft 6. The moving slide 3 is oscillated to vibrate the cutting edge of the end face machining tool 1a.
Furthermore, in the end face machining by the end face machining tool 1a, in addition to the vibration of the cutting edge, a feed of 0.1 mm per rotation of the workpiece W is added.
Therefore, as shown in FIG.7 (c), the thickness of the chip becomes a chip having a thickness of 0.3 mm which is 0.2 mm + 0.1 mm at the maximum, and the minimum is 0 mm which is not cut. Therefore, cutting and non-cutting are repeated, and as a result, short chips are discharged (see FIG. 8B).
The number of rotations of the motor 8 that rotates the eccentric cam 9 is, for example, 3900 min ⁻¹ and vibration of 3900 cpm (cycle / min), and the cutting edge of the end surface cutting tool 1 a is a sine curve (hereinafter referred to as a curve). Vibrates to draw a trajectory.

<Operation of machine tool 30>
Here, the operation of the NC lathe of the machine tool 30 including the tool vibration device 20 will be described.
<Cutting>
As shown in FIGS. 7 (a) and 7 (b), the collet chuck 12c holds a workpiece W having a thin disk shape and a through hole formed in the center thereof, and is fixed by a plurality of bolts 12d to prevent popping out. ing.
As shown in FIG. 2, a plurality of pieces of good cutting condition data confirmed in advance are input to the NC device of the NC lathe 30. Selection is made from the data of the plurality of cutting conditions, and cutting is performed.
As shown in FIG. 7A, when the start button of the machine tool 30 is pressed, the prepared program is started. A spindle motor (not shown) of the spindle 12 is activated to rotate the spindle 12a and the workpiece W. When the motor 8 of the tool vibration device 20 is activated, the end face machining tool 1a is vibrated by the eccentric cam 9 having an eccentricity c of 0.1 mm.
Further, the saddle 22 (see FIG. 2) of the machine tool 30 is moved to the main shaft 12a side by the Z-axis moving mechanism, and the cross-rotating slide 32 approaches the outer diameter of the workpiece W by the X-axis moving mechanism. Then, the end face machining tool 1a is cut into the end face on the outer periphery of the work W, and a feed of 0.1 mm / rev is added to start the end face machining of the work W.

<Cutting conditions>
As an example of the cutting conditions, the cutting width of the end face of the workpiece W is changed from φ244 to 180 mm, the inner diameter is φ60, the material is steel (SPCC), the cutting edge of the carbide tip is R0.4, and the cutting amount is one piece The feed per rotation of 1.0 mm is 0.1 mm / rev.
For example, when the rotation speed (per minute) of the main shaft 12a is 450 min ⁻¹ , the vibration frequency (per minute) of the tool vibration device 20 is 3900 cpm (cycle / min).
It should be noted that since the rotation speed 450 of the main shaft 12a / the rotation speed 3900 of the tool vibration device 20 is not divisible, it becomes 0.11538, and the vibration is dispersed, which is convenient for cutting chips.

FIG. 7C shows the locus of the cutting edge of the end face machining tool 1a, and is an explanatory diagram showing the combined locus (curves a and b) of the workpiece W for two rotations.
As shown in FIG. 7C, the locus of the cutting edge of the cutting tool 1a is out of phase to form the curve b when the workpiece W is rotated one more time from the curve a. Since a phase shift occurs between the two curves a and b, the region S is formed, and the chip is cut.
That is, as shown in this graph, the first region S formed by the curve b whose phase is shifted from the curve a will be described.
As shown in FIG. 7C, the region S from the start point O1 to the end point O2 is formed in a substantially I shape. In the substantially S-shaped region S, chips are first generated from the starting point O1, and gradually increase from the thicknesses e and f of the chips, and the thicknesses g and h become 0.3 mm at the maximum, and this time, the thickness i gradually increases. , J and the thickness becomes zero at the end point O2. Therefore, the chips are cut at the end point O2 and fall into the lower chip box.

  As shown in FIG. 8 (b), the length of the chips is discharged as curled short chips with an actual measurement value of about 20 mm. Can be resolved.

Various modifications and changes can be made within the scope of the technical idea. Here, although it demonstrated as the tool vibration apparatus 20 for the end surface processing mounted in the cross rotation slide 32 of NC lathe 30 of 2-axis control, you may attach not only to this but to the table etc. of other machine tools. .
In addition, the shape of the plate 3a contacting the outer peripheral surface 9b of the eccentric cam 9 is not limited to a U-shaped groove or a horseshoe-shaped groove, but may be a long hole, an elliptical hole, a square hole, or a polygonal hole.
Further, the eccentric amount c of the eccentric cam 9 is not limited to 0.1 mm, but may be 0.15 mm, 0.2 mm, or other.

In the present embodiment, the rotational speed of the main shaft 12a is 450 min ⁻¹ and the vibration frequency of the end face machining tool vibration device 20 is 3900 min ⁻¹ , but the tool vibration depends on the workpiece material, material dimensions, and rotational speed. The frequency of the apparatus 20 is set as appropriate.
Further, a control device that varies the rotational speed of the motor 8 may be provided. For example, when changing the rotational speed of the motor 8, it can be changed by changing the drive frequency by an inverter circuit having a transistor element.
Further, the driving device 8 may be a servo motor. The servo motor can easily change the rotation speed by changing the NC program.

1 Tool 1a End face cutting tool 2 Tool post (comb-shaped tool post)
2a groove 3 rotation slide 3a plate 3b groove 3e low friction sliding member 3f lubrication hole 3g depression 3n nut 4 slide base 4a upper surface 4b lower surface 5 base 5a depression 6 rotation shaft (pin)
6a Flange 6b Thread 6n Nut 7 Block 7a Oil impregnation member (felt)
7c Refueling port 7d Felt insertion groove 8 Drive unit (motor)
8a Rotating shaft 8b Bolt 8c Flange 8e Bearing 9 Eccentric cam 9a Through hole 9b Outer peripheral surface 9c Oil sump groove plate 9d (with hexagonal hole) Set screw 10 Cross slide 20 End face (plane) tool vibration device 20a Cover 30 Workpiece Machine (NC lathe)
a, b Curve c Eccentricity o Start point, end point e, f, g, h, i, j Chip thickness H Eccentric cam vibration mechanism S Chip generation area T Empty cutting area W Workpiece

Claims (3)

A tool vibration device (20) for planar machining that reciprocally vibrates in a rotational direction so that a tool post (2) to which a tool (1) is fixed moves forward and backward along a feed direction,
A rotating slide (3) to which the tool post (2) is fixed;
A slide base (4) for rotatably supporting the rotating slide (3) about a rotating shaft (6) orthogonal to the feeding direction;
An eccentric cam vibration mechanism (H) that abuts the rotationally driven eccentric cam (9) against the rotational slide (3) and reciprocally vibrates the rotational slide (3) around the rotational shaft (6). )When,
A tool vibration device (20) for plane machining, comprising:   The vibration direction of the cutting edge of the tool (1) vibrates in a direction from the outer periphery to the center of the workpiece (W) when machining the end face of the workpiece (W). Tool vibration device (20).   A distance L2 from the rotating shaft (6) to the cutting edge of the cutting tool 1a with respect to the distance L1 from the rotating shaft (6) to the rotating shaft (8a) for rotationally driving the eccentric cam (9). The tool vibration device (20) for plane machining according to claim 1, characterized in that the ratio is 1: 1.