JPH1190799A - Machine tool for crank pin machining and machining method for crank pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply machine a crank pin by controlling the relative position of the rotational angle of a work to the X-axis direction where a disc tool is separated from/approaches to the work, and the Y-axis which is vertical to the X-axis direction and vertical to the rotation axis line of the disc tool. SOLUTION: An X position and a Y position of a grinding wheel G, when a first crank pin P1 rotates from a zero position by 1 deg. each, are read from a memory address in order. These are outputted to drive units DUC, DUX, DYU so that a C-axis servo motor 7, an X-axis servo motor 12, and a Y-axis servo motor 14 are started. This constitution moves the grinding wheel in the X-axis direction and Y-axis direction, while the first crank pin P1 is rotated about the rotating axis line Wc of the work, namely the C-axis, so that the whole circumference of the first crank pin P1 is ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool for grinding a crankpin (pin portion) of a crankshaft (work) used for an automobile engine and a method for machining the crank. .

[0002]

2. Description of the Related Art Conventionally, a machine tool of this type has been disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 8-90395. This conventional machine tool is a machine tool for grinding a crankpin decentered by a certain dimension from a rotation axis of a crankshaft. The both ends journals of the crankshaft are held by a pair of left and right headstocks. By rotating the crankshaft about the axis of the crankpin by eccentrically holding the crankshaft so that the axis of the crankpin coincides with the center of rotation of the main shaft of the crankpin, A grinding wheel (disc tool) is engaged with the grinding wheel.

[0003]

However, this conventional configuration has the following problems. (1) A dedicated eccentric chuck is required in accordance with the journal diameter of the crankshaft and the dimension (pin stroke) between the journal and the crankpin, and there has been a problem that the configuration of the chuck device itself becomes complicated. (2) Since the journals at both ends are clamped and machined by the eccentric chuck, a mechanism and a control device for synchronously rotating the spindles of the pair of right and left headstocks with high accuracy are required, and in order to guarantee this synchronous rotation. There is a problem that a security mechanism or a security control device is required. (3) As the configuration of the headstock chuck device becomes more complicated,
There was a problem that the headstock itself became large. (4) It is necessary to change the journal holder of the eccentric chuck, and a pin stroke changing device is required in order to be able to handle workpieces with different journal diameters or pin strokes. There was a problem that the flexibility (versatility) of the machine tool was reduced.

Accordingly, an object of the present invention is to provide a machine tool capable of processing a crankpin or a similar pin portion more easily without using an eccentric chuck as in the related art.

[0005]

According to a first aspect of the present invention, there is provided a machine tool for processing a pin portion of a work having a pin portion eccentric with respect to a rotation axis of the work, While rotating the work around the rotation axis, and rotating the pin portion along a circular orbit, the rotation angle θ of the work and the X-axis direction in which the disc tool is separated from and brought into contact with the work, and the X 4. The machine tool according to claim 3, wherein the relative position in the Y-axis direction is perpendicular to the axial direction and also perpendicular to the rotation axis of the disk tool, and the machine tool according to claim 3 is eccentric to the rotation axis of the workpiece. A crank pin processing machine tool for processing a pin portion with a disk tool that rotates around an axis parallel to a rotation axis of the work, the bed being provided on the bed and supporting at least one end of the work. A work support device that includes a rotation drive mechanism that rotates the work around the predetermined rotation axis, and that supports the work so that the center of the pin portion rotates along a circular orbit; and a work support device that is provided on the bed. A tool support device that rotatably supports the disk tool in a plane crossing the rotation axis of the work, and the work support device and the tool support device in the X-axis direction in which the work and the disk tool approach and separate. The first to send relatively on the bed
A feed mechanism, a second feed mechanism that relatively sends the work support device and the tool support device in a Y-axis direction that is orthogonal to the X-axis direction and is also orthogonal to the rotation axis of the disk tool, The disk tool and the workpiece are relatively moved closer and farther apart in the X-axis direction and relatively moved in the Y-axis direction in accordance with the turning position on the circular orbit, so that the pin portion and the disk tool are constantly moved. 7. A numerical control device for controlling the rotation drive mechanism and the first and second feed mechanisms in association with each other so as to engage at a processing point on a line connecting the centers of the two, further comprising: Is a step of rotating the crankpin eccentrically with respect to the center of the work, an X-axis direction in which the disk tool is moved toward and away from the work according to the rotational angle position θ of the crankpin, and an X-axis A step of relatively moving the direction perpendicular a and perpendicular Y-axis direction and the rotation axis of the disc tool,
The method further comprises a step of feeding the disc tool and the crankpin relative to each other in the X-axis direction.

According to this machine tool or machining method, the work is rotated about its rotation axis, so that there is no need to use a conventional eccentric chuck device as a headstock chuck device. And the headstock can be reduced in size. Also, since the conventional eccentric chuck is not used, the left and right spindles do not need to be synchronously rotated with higher precision than in the past. Therefore, a mechanism or a control device therefor or a security mechanism or a security control device for guaranteeing the synchronous rotation is required. Becomes unnecessary.

Further, when a crankshaft is used as a work, it is possible to easily cope with a work having a different journal diameter or pin stroke without changing the journal holder or using a pin stroke changing device. become able to.

In addition, the relative position between the disk tool and the workpiece is X
Since the control is performed in two directions of the axial direction and the Y-axis direction, the position setting of the disk tool or the pin portion becomes easier than in the case of the configuration in which the relative movement is performed only in the X-axis direction. Processing can be realized. Here, the X axis direction is a direction orthogonal to the rotation axis of the work, and the Y axis direction is a direction orthogonal to the X axis direction and the rotation axis of the work. Therefore, by appropriately controlling the movement of the workpiece or the disk tool in both axial directions, the disk tool can be arbitrarily moved relative to the workpiece in the combined direction of both axes, that is, in a plane including both axial directions. The position in the plane direction of the disk tool) can be set arbitrarily, thereby easily realizing high-precision machining.

According to a second aspect of the present invention, there is provided a machine tool for processing the pin portion of a work having a pin eccentric with respect to the rotation axis of the work, wherein the work is centered on the rotation axis. While rotating the pin portion along a circular orbit, the X-axis direction in which the disc tool is separated from and brought into contact with the work in accordance with the rotation angle θ of the work, and at right angles to the X-axis direction and It is characterized in that a relative position in the Y-axis direction perpendicular to the rotation axis of the disk tool is controlled.

According to this machine tool, a work rotation angle detecting means is provided, and the relative position between the disk tool and the work is set in two directions in the X-axis direction and the Y-axis direction in accordance with the work rotation angle θ detected by the means. It is a configuration that controls the direction,
In addition, since the work is configured to rotate around the rotation axis, the same operation and effect as described above can be obtained.

According to a fourth aspect of the present invention, in the machine tool according to the third aspect, the work supporting device is configured to support the work so that the work cannot be fed in the Y-axis direction.
The tool support device is a tool table that is advanced and retracted in the X-axis direction on the bed by the first feed mechanism, and is capable of being fed in the Y-axis direction by the second feed mechanism on the tool table. And a tool head for rotatably supporting the disk tool.

According to this machine tool, the relative position with respect to the work is controlled by moving the disk tool in the X-axis direction and the Y-axis direction, and the X-axis direction and the Y-axis direction are controlled according to the rotation angle θ of the work. By appropriately controlling the positions of the disk tools, the disk tool can be moved to an arbitrary position in the XY plane, thereby obtaining the same operation and effect as described above.

According to a fifth aspect of the present invention, in the machine tool according to the third aspect, the tool support device is configured to rotate and support the disk tool so that it cannot be fed in the Y-axis direction. The apparatus comprises a headstock that rotatably supports the work, and a mechanism that guides the headstock on the bed such that the headstock can be fed in the Y-axis direction by the second feed mechanism.

According to this machine tool, the relative position between the disk tool and the work is controlled by moving the disk tool in the X-axis direction and moving the work in the Y-axis direction. Again,
The position of the disk tool in the X-axis direction and the Y-axis of the work are controlled by simultaneously controlling the rotation angle θ of the work and the Y-axis direction and the position of the disk tool in the X-axis direction on three axes, or according to the rotation angle θ of the work. By controlling the position in the direction, the disk tool can be made to follow the pin portion of the work, thereby achieving the same operation and effect as described above.

[0015]

Next, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a crankshaft used in a four-cylinder engine of an automobile will be described as an example of a workpiece, and a machine tool for performing outer diameter grinding of a crankpin (pin portion) of the crankshaft will be described. Therefore, in the present embodiment, the disc tool is exemplified by a disc-shaped grindstone G made of ultra-hard abrasive grains such as diamond or CBN.

FIGS. 1 and 2 show a machine tool 1 according to a first embodiment. In the drawing, reference numeral 2 denotes a bed, on which a table 3 is provided movably in the Z-axis direction (left and right directions in FIG. 1) via a flat slide surface 2a and a V-shaped slide surface 2b. The position of the table 3 is controlled by a Z-axis servomotor 4 and a feed mechanism mainly including a feed screw 4a and a nut 4b. A headstock 5 and a tailstock 6 are arranged on the table 3 so as to face each other such that they can approach or separate from each other.
There is provided a chucking device 5a for clamping while maintaining a predetermined rotation angle phase. The chuck device is not an eccentric chuck as in the related art, but has a normal configuration in which the rotation axis Wc of the work W is clamped in a state where the rotation axis Wc is aligned with the main shaft (C axis) of the headstock 5.

A work W is set between the headstock 5 and the tailstock 6. The work W has first to fourth crankpins P1 to P4 to be processed. First
And the fourth and fourth crankpins P1, P4 and the second and third crankpins P2, P3 form the rotation axis Wc of the workpiece W.
There is a phase difference of 180 ° around each other. The work W is driven by the C-axis servo motor 7 of the headstock 5 as a drive source, and the rotation axis Wc of the work W, that is, the journal Wa.
And rotates at a predetermined feed speed about the axis of. For this reason, the crankpin P rotates on a circular orbit that is eccentric with respect to the C axis by the amount of the pin stalk. The C-axis servo motor 7 has a function of determining the phase of the work W.

Next, the bed 2 is integrally provided with a grindstone base 10 constituting a tool supporting device. The grindstone base 10 is connected to the grindstone base 10 via a flat slide surface 10a and a V-shaped slide surface 10b. Reference numeral 11 is provided so as to be movable in the X-axis direction (a direction perpendicular to the rotation axis Wc of the work W, that is, a vertical direction in FIG. 1 and a horizontal direction in FIG. 2). The position of the wheel head 11 in the X-axis direction is the first position of the X-axis servo motor 12, the feed screw 12a and the nut 12b.
It is controlled mainly by the feed mechanism.

On the grinding wheel head 11, a grinding wheel head 13 is provided.
It is provided so as to be movable in the axial direction (the X-axis direction and the direction orthogonal to the rotation axis of the grinding wheel G, the direction orthogonal to the paper surface in FIG. 1, and the vertical direction in FIG. 2), and the position in the same direction is the second feed mechanism. Is controlled by a Y-axis servo motor 14 constituting In FIG. 2, reference numeral 14a denotes a feed screw rotated by the Y-axis servomotor 14, and 14b denotes a feed screw 14a.
The nut meshing with is shown. A grinding wheel G (disk tool) having a disk shape is attached to the grinding wheel head 13. The grindstone G is rotated at a high speed by a drive motor (not shown) built in the grindstone head 13.

The grinding wheel G provided in this manner controls the rotation of the X-axis servomotor 12 and the Y-axis servomotor 14 so that the rotation axis Wc (C-axis) of the set workpiece W is obtained.
Can be arbitrarily moved in a plane orthogonal to (X-Y plane). Further, by controlling the rotation of the C-axis servomotor 7, the rotation speed of the set work W can be controlled arbitrarily. By controlling the rotation of the Z-axis servomotor 4, the work W can be moved in the Z-axis direction. Thus, any one of the first to fourth crankpins P1 to P4 can be positioned in front of the grindstone G. FIG. 1 shows the first crankpin P1
Is positioned in front of the grindstone G (processing standby position).

Next, a control device for controlling the rotation of each of the X, Y, Z, and C axis servomotors 12, 14, 4, and 7 includes an input device 21 mainly including a CRT 21a and a keyboard 21b; CNC including CPU and memory MEM
Device 22 and drive units DUX, DUX, D for each axis
UC and DUZ. Drive unit DU
X controls the rotation of the X-axis servomotor 12, the drive unit DUY controls the rotation of the Y-axis servomotor 14, the drive unit DUC controls the rotation of the C-axis servomotor 7, and the drive unit DUZ controls the Z-axis servomotor 4. The rotation is controlled. Based on the program input to the CNC device 22 via the input device 21, the servo motors 12, 14, 7, 4 for the respective axes are driven by the respective drive units D.
The rotation is controlled via UX, DUI, DUC, and DUZ.

Next, a method of grinding the crankpins P1 to P4 using the machine tool 1 will be described. First, the position of the grindstone G in the X-axis direction and the Y-axis direction with respect to the rotation axis Wc of the work W can be expressed as the following two equations as a function of the rotation angle θ of the crankpin P from the relationship shown in FIG. . X = Kx + R · cos θ + Δr (1−θ / 360 · C
n) Y = R · sin θ where Kx: finishing radius of pin P + radius of grinding wheel G R: pin stroke θ: zero-degree position of pin P (position on line connecting center Gc of grinding wheel G and center Wc of workpiece W) )) Rotation angle Δr: Grinding allowance (radius) Cn: Number of rotations at which the work rotates while removing grinding allowance Δr (for example, Δr is removed at 10 rotations) Wc: Rotation center of work W Pc: Crank pin Moving trajectory Gc: Moving trajectory of grinding wheel G

Next, according to the flow shown in FIG. 5 programmed in the CPU of the CNC device 22, the X-axis direction and Y-direction of the grindstone G at every rotation angle θ of the crankpin P = 1 °.
The position in the axial direction is obtained, and this is used as shown in FIG.
Each address Ma0001- of the memory MEM of the C device 22
Ma3600 (when Cn = 10 rotations).
This process is performed before the start of processing.

The actual machining operation is performed by the CNC device 22
This is executed according to the flow shown in FIG. That is, when N = 1 is input to instruct the machining of the first crankpin P1 (step 11), the work W is clamped by the chuck device of the headstock 5 (step 12). It is confirmed that ≦ 4 (in the case of a four-cylinder crankshaft). At this point, since N = 1 has been input, the process proceeds to step S14. In step 14, the table 3 is determined. The indexing of the table 3 is performed by starting the Z-axis servomotor 4 via the drive unit DUZ to move the table 3 in the Z-axis direction, whereby the first crank pin P1 is indexed in front of the grinding wheel G. It is.

At the same time, the C-axis servomotor 7 is started, and the work W is rotated about its rotation center Wc, whereby the first crankpin P1 is moved to the zero-degree position (θ = 0) shown by a solid line in FIG. °). After the indexing, the C-axis servomotor 7 is temporarily stopped, and the first crankpin P1 is held at the zero-degree position. Thereafter, the X-axis servomotor 12 is started, and the grinding wheel base 11 is rapidly traversed along the X-axis direction (step 15). As a result, as shown by the solid line in FIG. Are in light contact with the first crankpin P1. This is the processing standby position of the grindstone G. At this processing standby position, the grindstone G starts rotating at high speed.

Next, in step 16, the X position and the Y position of the grinding wheel G when the first crank pin P1 is rotated by 1 ° from the zero degree position are stored in the memory address M.
a0001 to Ma3600, which are sequentially output to the drive units DUC, DUX, and DYU to start the C-axis servomotor 7, the X-axis servomotor 12, and the Y-axis servomotor 14, and thereby the first crankpin P
The grindstone G moves in the X-axis direction and the Y-axis direction while 1 rotates around the rotation axis Wc of the work W, that is, the C-axis, and the entire circumference of the first crankpin P1 is ground. During this processing, the processing points of the grinding wheel G and the crankpin P1 always exist on a line connecting the centers of these. This has the advantage that the processing of calculating the position correction amount between the two can be facilitated and the processing error can be reduced.

In this case, each of the well-known steps of rough grinding, fine grinding, and fine grinding in the grinding operation is performed using CN data as NC data.
This can be realized by setting a cycle for designating a memory address based on each grinding speed data input / set to the C device 22 in correspondence with these grinding speed data.

After the first crankpin P1 is ground as described above, the second and third crankpins P2 and P3 are sequentially ground in the same manner. However, prior to the grinding of the second and third crankpins P2 and P3, the work W is indexed to a position of 180 ° to absorb the phase difference with the first crankpin P1 (step 20). The second and third crank pins P2 and P3 are positioned at the zero-degree position in FIG.

After the grinding of the third crankpin P3 is completed, the work W is again rotated by 180 ° to absorb the phase difference between the second and third crankpins P2, P3, and thereby the fourth crankpin P4. Is determined at the zero-degree position (step 21), and then the fourth crankpin P4 is ground by the same procedure.

After finishing the grinding of the fourth crankpin P4,
Since N = 5 in step 18, step 13
In step (2), the flow proceeds to step 22. At this stage, the table 3 returns to the original position, and the chuck device of the headstock 5 is unclamped. The grinding of the crank pins P1 to P4 is completed.

According to the machine tool 1 or the processing method of the first embodiment described above, the work W is rotated about its rotation axis Wc, and each crank pin P to be processed is rotated by this rotation axis Wc (the main shaft). Since the machining is performed while rotating while being decentered by the pin stroke from the (C axis), a dedicated eccentric chuck unlike the conventional one is not required, so that the structure of the chuck device can be simplified and the headstock can be made compact. Can be

Since no eccentric chuck is required,
It is not necessary to rotate the left and right main shafts synchronously with higher precision than in the past, so that a mechanism or control device therefor or a security mechanism or a security control device for guaranteeing synchronous rotation is not required. Furthermore, when machining various workpieces having different journal diameters and pin strokes, it can be easily handled without changing the conventional journal holder or using a pin stroke changing device. The flexibility of the machine 1 can be increased.

In particular, since the position of the grindstone G is controlled in two directions of the X and Y axes in accordance with the rotation angle θ of the crankpin P, the grindstone G is moved only in the X axis direction as in the prior art. Complicated position correction of the grindstone G is not required as compared with the case of performing the processing, whereby high-precision processing can be easily realized.

The embodiment described above can be implemented with various changes. For example, in the above-described embodiment, the rotation angle θ of the crankpin P and the X,
The configuration in which the three positions in the Y-axis direction are registered in advance in the memory ME of the CNC device 22 and the three positions θ, X, and Y are read during the execution of the machining operation has been exemplified. Register only two positions in the X and Y axis directions of
The rotation angle θ of the crank pin P may be detected by an encoder (rotation angle detection means), and only the X and Y positions of the memory address Ma corresponding to the detected rotation angle θ may be read.

Further, an example of a method in which the rotational angle θ of the crankpin P and the two positions of the grinding wheel G in the X and Y axes directions are calculated in advance based on the above two equations, and the result is registered in each memory address Ma. However, three positions of θ, X, and Y or positions in two directions of X and Y based on θ detected by the encoder may be calculated in real time during the execution of the machining operation.

In the illustrated first embodiment, the grinding stone G
Is moved in two directions of the X and Y axes, but it is optional to move either the grindstone G or the work W in the X and Y directions. I just need. For example, as shown in FIG. 7, the grindstone head 111 provided with the grindstone G is configured to move only in the X-axis direction, while the headstock 105 is moved relative to the table 103 moving in the Z-axis direction by rotating the crankpin P. It may be configured to move in the Y-axis direction according to the angle θ. In this case, the grindstone G is moved in the X-axis direction and the headstock 105 is moved in the Y-axis direction in accordance with the rotation angle θ of the crankpin P, or the rotation angle θ of the crankpin P, X
The configuration may be such that the axial position and the position of the headstock 105 in the Y-axis direction are simultaneously controlled on three axes. In the drawing, reference numeral 114 denotes a Y-axis servomotor, 4 denotes a Z-axis servomotor, 7 denotes a C-axis servomotor, 103a denotes a guide column for guiding the headstock 105 in the Y-axis direction, and 105a denotes a work W 2 shows a chuck device for chucking a sheet. Other configurations that do not require modification are given the same reference numerals as in the first embodiment.

With the machine tool 100 of the second embodiment configured as described above, the work W is rotated about its rotation axis Wc, and the crank pin P is eccentric with respect to the main shaft by a pin stroke. Rotation eliminates the need for a dedicated eccentric chuck as in the prior art.
The same operation and effect as the embodiment can be obtained.

The work is not limited to the above-described four-cylinder crankshaft, but may be applied to a six-cylinder or more crankshaft. Further, as shown in FIG. The present invention can be similarly applied to the crankshaft. When the number of cylinders is small, the work W can be cantilevered and processed without using the tailstock 6, so that in the case of the work W, the headstock is used as in the second embodiment. 105 to Y
It is effective to apply a configuration for moving in the axial direction.
However, it goes without saying that the present invention can be similarly applied to a crankshaft having four cylinders or more if the headstock and the tailstock are integrally moved in the X-axis direction or the Y-axis direction.

Further, the grinding wheel G is not moved in the X-axis direction and the Y-axis direction, but is moved in the X-axis direction and the Y-axis direction while rotating the work W about the rotation axis Wc thereof. A configuration for controlling the relative position between G and the work W may be employed.

Although the case of grinding the crankpin P has been described as an example, the present invention can be applied to other processing forms, for example, cutting, polishing, or grooving. Therefore, whetstone G is exemplified as a disk tool,
The present invention can also be applied to a disk tool suitable for these other forms of machining.

Finally, the crankshaft is illustrated as the work and the crankpin is illustrated as the pin portion.
The machine tool according to the present invention can be similarly applied to a work having a similar form, that is, a work having a pin portion at a position decentered by a certain dimension with respect to a rotation axis in a use state of the work. .

[Brief description of the drawings]

FIG. 1 is a plan view of a machine tool according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a diagram showing a relative positional relationship between a grindstone and a crankpin in the first embodiment.

FIG. 4 shows a CNC in which the rotation angle θ of the crankpin and the positions of the grinding wheel in the X-axis direction and the Y-axis direction are stored in each address.
FIG. 3 is a diagram showing the contents of a memory of the device.

FIG. 5 is a flowchart showing a program for calculating the positions in the X-axis direction and the Y-axis direction as a function of the rotation angle θ of the crankpin.

FIG. 6 is a flowchart illustrating a control program for controlling a machining operation according to the first embodiment.

FIG. 7 is a plan view of a machine tool according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Machine tool of 1st Embodiment 3 ... Table 4 ... Z-axis servomotor 5 ... Headstock 6 ... Tailstock 7 ... C-axis servomotor 10 ... Grindstone base 11 ... Grindstone 12 ... X-axis servomotor 13 ... Whetstone head 14 ... Y-axis servo motor 21 ... Input device 22 ... CNC device W ... Work (crankshaft) P ... Pin part (crank pin) G ... Whetstone (disk tool) 100 ... Machine tool of the second embodiment

Claims (6)

[Claims] 1. A machine tool for processing a pin portion of a work having a pin portion eccentric to a rotation axis of the work, wherein the work is rotated about the rotation axis, and the pin is rotated. While rotating the part along the circular orbit, the rotation angle θ of the work and the X-axis direction of the disk tool separated from and approaching the work and the Y-axis perpendicular to the X-axis direction and perpendicular to the rotation axis of the disk tool A machine tool for machining a crankpin, wherein a relative position in the direction is controlled. 2. A machine tool for processing said pin portion of a work having a pin portion eccentric with respect to a rotation axis of the work, wherein said work is rotated about said rotation axis and said pin is rotated. While rotating the portion along the circular orbit, the X-axis direction of the disk tool which is separated from and brought into contact with the work according to the rotation angle θ of the work, and at right angles to the X-axis direction, and also at right angles to the rotation axis of the disk tool A machine tool for machining a crankpin, wherein the relative position in the Y-axis direction is controlled. 3. A crank pin processing machine tool for processing a pin portion eccentric to a rotation axis of a work with a disk tool rotating around an axis parallel to the rotation axis of the work, the bed comprising: a bed; A rotating drive mechanism provided on the bed to support at least one end of the work and rotate the work around the predetermined rotation axis, such that the center of the pin portion turns along a circular orbit. A work support device for rotatably supporting a work, a tool support device provided on the bed for rotatably supporting the disk tool in a plane crossing a rotation axis of the work, and the work and the disk tool approaching and separating from each other A first feed mechanism for relatively feeding the work support device and the tool support device on the bed in the X-axis direction, and a rotation axis of the disc tool orthogonal to the X-axis direction. A second feeder for relatively feeding the work support device and the tool support device in the Y-axis direction orthogonal to
A feed mechanism, and the disk tool and the work are relatively approached and separated in the X-axis direction and relatively moved in the Y-axis direction according to a turning position of the pin portion on the circular orbit. A numerical controller for controlling the rotation drive mechanism and the first and second feed mechanisms in such a manner that the pin portion and the disk tool always engage at a processing point on a line connecting the centers of the two. A featured machine tool. 4. The machine tool according to claim 3, wherein the work supporting device is configured to support the work so that the work cannot be fed in the Y-axis direction, and the tool supporting device is controlled by the first feed mechanism. A tool table which is advanced and retracted in the X-axis direction on the bed; and a tool head which can be fed in the Y-axis direction by the second feed mechanism on the tool table and rotatably supports the disk tool. Machine tool characterized by the fact that: 5. The machine tool according to claim 3, wherein the tool support device is configured to rotatably support the disk tool so that the disk tool cannot be fed in the Y-axis direction, and the work support device rotates the work. A machine tool comprising: a headstock to be supported; and a mechanism for guiding the headstock on the bed so as to be capable of being fed in the Y-axis direction by the second feed mechanism. 6. A step of rotating the crank pin eccentrically with respect to the center of the work, an X-axis direction in which the disk tool is moved toward and away from the work in accordance with the rotational angle position θ of the crank pin, and a direction perpendicular to the X-axis direction. And relatively moving in the Y-axis direction perpendicular to the rotation axis of the disk tool,
A method of machining a crankpin, comprising a step of relatively cutting and feeding the disk tool and the crankpin in the X-axis direction.