JP3187740B2 - Multi-step grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a slope of a workpiece,
The present invention relates to a multi-step grinding machine for grinding a plurality of grinding portions such as an inner surface and an inner groove.

[0002]

2. Description of the Related Art There are various shapes of a workpiece to be ground by a grinding machine, and various grinding methods are adopted according to a grinding portion such as the shape of the workpiece. For example,
As shown in FIG. 5, in a workpiece 3 integrally provided with a cylindrical portion 1 and a flange portion 2, an inner surface 4 and a slope 5 thereof are ground, and an inner groove 6 arranged on the inner surface 4 at three equal intervals is ground. In this case, a single-step grinding method in which a plurality of single-function machines are used and grinding is performed while changing the machine for each grinding part, or a single-step grinding method using a multi-step grinding machine having multiple functions There is a multi-step grinding method of sequentially grinding with a machine.

[0003] In the single-step grinding method, a work piece is processed for each grinding step.
Needs to be reattached to the work chuck, and each time, the posture of the workpiece 3 with respect to the center axis of the
There is a problem that the parallelism, coaxiality, and the like of the inner groove 6 easily vary with respect to the inner diameter axis of the workpiece 3. On the other hand, in the multi-step grinding method, once the workpiece 3 is once mounted on the work chuck of the main spindle, the grinding portion of the inner surface 4, the slope 5, and the inner groove 6 can be sequentially ground in that state, so that the workpiece 3 There is no need to re-attach the workpiece 3 to the work chuck, the grinding time can be reduced compared to the single-step grinding method, the grinding accuracy has been greatly improved, and a transport device for transporting the workpiece 3 between machines has been developed. There are advantages such as not being required.

A conventional multi-step grinding machine is provided with a spindle device 8, an inner surface grinding device 9, a slope grinding device 10, and a groove grinding device 11 on a bed 7, as shown in FIG. The workpiece 3 is mounted, and the inner surface of the workpiece 3 is fixed by the inner surface grinding wheel 12 of the inner surface grinding device 9 and the inclined surface grinding wheel 13 of the inclined surface grinding device 10.
4 and the slope 5 are processed at the same time, and thereafter the inner groove 6 is processed by the groove grinding wheel 14 of the groove grinding device 11. The spindle device 8 includes a headstock 33, a work chuck 15 mounted on the tip of the spindle of the headstock 33, and a spindle motor 16 for driving the work chuck 15 via the spindle. Bed 7 via axis slide table 18
It is slidably mounted on the upper side in the U-axis direction.

[0005] The internal grinding device 9 comprises an internal grinding wheel base 19,
An inner surface grinding wheel 12 is mounted on the inner surface grinding wheel table 19 via a grinding wheel shaft 20, and an inner surface grinding motor for driving the inner surface grinding wheel 12 around the axis of the grinding wheel shaft 20. Groove grinding machine
11 is a groove grinding wheel base 21, a groove grinding wheel 14 mounted on the groove grinding wheel table 21 via a grinding wheel holder 22, and a groove grinding wheel
And a groove grinding motor 23 for driving the same. And
Internal grinding device 9 and the groove grinding apparatus 11 is arranged in point symmetrical positions on the swiveling positionable swivel table 24 every 180 degrees, also the turntable 24 is Z ₁ axis slide table 25,
X ₁ axis via the slide table 26, the X ₁ axis slide 27 is slidably mounted on the bed 7 to the Z ₁ axis and the X ₁ axis direction.

The slope grinding apparatus 10 includes a slope grinding wheel table 28,
The slope grinding wheel 13 mounted via a wheel spindle of the slope grinding wheel head 28, and a slope grinding motor 29 for driving the slope grinding wheel 13 around an axis of the grinding wheel axis, Z ₂ axial slide table 30, X _2- axis slide table 31, X _2- axis slide 32
It is slidably attached to the Z ₂ axes and X ₂ axially on the bed 7 via the.

[0007] In the case of grinding the workpiece 3, FIG.
The work proceeds as shown in the work process. First, at the working position P, after the work 3 having been ground is detached from the work chuck 15 at the tip of the spindle of the headstock 33 and taken out, a new work 3 is mounted on the work chuck 15, and The workpiece 3 is rotated around its axis by the spindle motor 16 integrally with the spindle. Then, the inner surface 4 of the workpiece 3 is ground by the inner grinding wheel 12 of the inner surface grinding device 9, and the slope 5 of the workpiece 3 is ground by the slope grinding wheel 13 of the slope grinding device 10.

When the grinding of the inner surface 4 and the inclined surface 5 of the workpiece 3 is completed, the rotation of the spindle is stopped, and then the turning table 24 is turned 180 so that the groove grinding wheel 14 of the groove grinding device 11 faces the working position P. Internal rotation by positioning
9 and the groove grinding device 11 are exchanged. Next, at the working position P, as shown in FIG. 8, the position of the inner groove 6 on the inner surface 4 of the inner surface 4 of the work 3 coincides with the position of the groove grinding wheel 14 along the center axis thereof. The indexing rotation of the spindle is used to perform the equal indexing, and the inner grooves 6 are set at three equal positions a to c of the workpiece 3 by the groove grinding wheel 14 of the groove grinding device 11.
Are sequentially ground. When the groove grinding of the inner groove 6 is completed, the turning table 24 is turned 180 degrees to replace the groove grinding device 11 at the work position P with the inner surface grinding device 9, and then the ground workpiece 3 is placed on the work chuck. Remove from 15 and take out.

[0009]

The conventional multi-step grinding machine has advantages such as shortening the grinding time and improving the processing accuracy as compared with the single-step grinding method, but the work as shown in FIG. Since the workpiece 3 is machined in order, there is a disadvantage that the grinding time cannot be sufficiently reduced. That is, with the conventional multi-step grinding method, the inner groove 6 cannot be ground while the inner surface 4 and the slope 5 are being ground. Therefore, the inner surface 4, the slope 5 and the inner groove 6
There is a disadvantage that the grinding time becomes longer by the grinding time of the inner groove 6 as compared with the case of simultaneous grinding.

When a large number of workpieces 3 are to be machined continuously, the machined workpiece 3 is detached from the work chuck 15 and a new workpiece 3 is mounted on the work chuck 15. It is necessary to start the work of grinding the workpiece 3.
For this reason, although there is a considerable time difference between the grinding time of the inner surface 4 and the grinding time of the inner groove 6, the work of attaching and detaching the workpiece 3 to and from the work chuck 15 cannot be performed simultaneously and in parallel during the grinding. The overall processing time is very long.
Moreover, since it is necessary to turn the turning table 24 after the completion of the inner surface grinding and the slope grinding and after the completion of the groove grinding,
There is a disadvantage that the processing time is further increased. The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a multi-step grinding machine capable of greatly reducing the entire processing time including the grinding time and efficiently and quickly and accurately grinding a workpiece. And

[0011]

According to a first aspect of the present invention, there is provided a plurality of spindle devices having a work chuck for gripping a workpiece, and supporting the plurality of spindle devices, The spindle device is provided with a revolving table that is indexed and revolved so as to correspond to a plurality of work positions, respectively, and in each work position, a plurality of types of grinders are separately arranged so as to grind different grinding portions of the workpiece, A loader device is provided at a work position where a grinding device having the shortest grinding time is located, for loading and unloading a workpiece with respect to a work chuck of a spindle device on the work position side. According to a second aspect of the present invention, in the first aspect of the present invention, a grinding apparatus and a loader apparatus having the shortest grinding time are provided on a common slide table.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the turning table is provided with two main spindle devices at point symmetric positions, and two main spindle devices corresponding to the two main spindle devices are provided. A first grinding device and a loader device for grinding a first grinding portion of a workpiece are arranged on the first working position side of the working position, and a second grinding of the workpiece is arranged on the second working position side. A second grinding device for grinding a portion and a third grinding device for grinding a third grinding portion of a workpiece are arranged. According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a grinding device having a shortest grinding time is used for grinding a groove of a workpiece. An index sensor for detecting the groove grinding position of the workpiece and stopping the rotation of the spindle device corresponding to the working position on the grinding device side is provided.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 illustrates a multi-step grinding machine according to the present invention. The multi-step grinding machine has two spindle devices 41 and 42 arranged at the center of a bed 40 and two spindle devices 41 on the bed 40. , turntable 43 42 supporting and the spindle device 41, 42 is pivoted indexing 180 degrees as respectively corresponding to the first working position P ₁ and the second working position P ₂
When a groove grinding apparatus 44 and the loader unit 45 arranged in the first working position P ₁ side on the bed 40, first on the bed 40 2
And a internal grinding device 46 and the inclined surface grinding apparatus 47 disposed in the working position P ₂ side. In this embodiment, as will be described later, the groove grinding time by the groove grinding device 44 is the shortest compared to the internal grinding time by the internal grinding device 46 and the slope grinding time by the slope grinding device 47. loader 45 is arranged in the first working position P ₁ side with a grooved grinding apparatus 44.

The swivel table 43 is supported on the bed 40 so as to be indexable by 180 degrees around the longitudinal axis, and the spindle devices 41 and 42 are mounted on the swivel table 43 at point symmetric positions. Each of the spindle devices 41 and 42 includes a headstock 48, a main shaft 49 projecting from the headstock 48 in the horizontal direction, supported in a continuous rotation and indexable in the rotation direction, and mounted so as to be positionable. And a work chuck 50 for detachably holding the cylindrical portion 1 side of the workpiece 3. The axes of the respective spindles 49 are parallel to each other at the same height, and when the turning table 43 is indexed and turned by 180 degrees to position the respective spindle devices 41 and 42 at the respective working positions P ₁ and P ₂ , It is attached to each headstock 48 such that their axes coincide with each other. Each spindle device 41, 42
A main shaft motor 51 for driving the rotation of the spindle motor 51 is provided.

The groove grinding device 44 includes a groove grinding wheel table 52 and a grinding wheel holder projecting from the groove grinding wheel table 52 toward the spindle 41.
53, a groove grinding wheel 54 rotatably supported on the tip side of the grinding wheel holder 53, a groove grinding motor 55 for driving the groove grinding wheel 54, and an index sensor 56 mounted on the tip side of the grinding wheel holder 53. And And the groove grinding device 44,
X ₁ axis slide table 57, Z ₁ axis slide table 5
8, Z ₁ axis is slidably supported in the X ₁ axis and Z ₁ axial direction on the bed 40 via the slide 59, and the groove is parallel to the first working position P ₁ side of the main shaft 49 of the spindle device 41 Z so that the center plane of the thickness of the grinding wheel 54 coincides with the axis of the spindle 49.
_It can move in _one axis direction.

The Z ₁ axis slide 59 is fixed on the bed 40, and the Z ₁ axis slide table is mounted on the Z ₁ axis slide 59.
58 is slidably mounted. The Z ₁ axis slide table 58 is driven by a Z ₁ axis motor 60 to drive the spindle 49 of the spindle device 41.
To the axis parallel to the Z ₁ axial direction which is slidable. X ₁ axis slide table 57 is mounted on the Z ₁ axis slide table 58 is slidable by a drive of the X ₁ axis motor 61 to Z ₁ axial direction perpendicular to the X ₁ axis direction, the X ₁ axis slide table A groove grinding wheel base 52 is mounted on 57. Note that X
_{The one-} axis slide table 57, the _one- axis slide table 58, and the _one- axis slide 59 constitute an XZ table.

The indexing sensor 56 is mounted on the grinding wheel holder 53 on the side opposite to the groove grinding wheel 54, and the grinding position of the inner groove 6 is adjusted.
It is intended for positioning by stopping the rotation of the first work position P ₁ of the main shaft 49 of the spindle device 41 detects the a. The loader device 45, in the first working position P _1, the workpiece 3 before processing attached to the workpiece chuck 50 of the spindle device 41, also the workpiece 3 of the machined separated from each workpiece chuck 50 Te be for taking out the outside, includes a loader chuck 62 to grip the detachable flange portion 2 side of the workpiece 3, on the X ₁ axis slide table 57 at the side of the groove grinding apparatus 44 It is installed.

The internal grinding device 46 includes an internal grinding wheel base 63,
A grindstone shaft 64 rotatably supported around the axis by the inner grindstone table 63 and an inner grindstone 65 attached to the tip of the grindstone shaft 64 are provided. And the inner surface grinding device 46
Is slidably supported in the X ₂ axis and Z ₂ axial direction via the X ₂ axis slide table 66, Z ₂ axial slide table 67 and the Z ₂ axial slide 68 on the bed 40, second working position P ₂ The spindle 49 of the side spindle device 42 and the grinding wheel shaft 64
Is aligned with the height of the axis of the main shaft 49.

[0019] Z ₂ axial slide 68 is fixed on the bed 40, to the Z ₂ axis slide 68, Z ₂ axial slide table 67 which is driven by Z _2-axis motor 69 is mounted slidably. The X ₂ axis slide table 66 is mounted on the Z ₂ axis slide table 67 so as to be slidable in the X ₂ axis direction by driving the X ₂ axis motor 70. Incidentally, the X ₂ axis slide table 66, Z ₂ axial slide table 67 and the Z ₂ axial slide 68, X-Z table is constructed. The slope grinding device 47 includes a slope grinding wheel base 71 and this slope grinding wheel base.
A grindstone shaft 72 rotatably supported around the axis at 71, a bevel grinding wheel 73 attached to the tip of the grindstone shaft 72, and a bevel grinding motor 74 that drives the beveled grinding wheel 73 integrally with the grindstone shaft 72. It has. The slope grinding device 47, X ₃ axis and Z ₃ via the X ₃ axis slide table 75, Z _3-axis slide table 76 and Z _3-axis slide 77 on the bed 40
It is slidably supported in the axial direction, and the axis of the grindstone shaft 72 of the bevel grinding wheelhead 71 is the same as the axis of the main shaft 49 of the headstock 48.

[0020] Z _3-axis slide 77 is fixed on the bed 40, to the Z _3-axis slide 77, Z _3-axis slide table 76 which is driven by a Z _3-axis motor 78 is mounted slidably. X ₃ axis slide table 75 is mounted slidably in the X ₃ axis direction by driving the X _3-axis motor 79 on Z _3-axis slide table 76. Incidentally, the X ₃ axis slide table 75, Z _3-axis slide table 76 and Z _3-axis slide 77, X-Z table is constructed.

Next, referring to the working process diagram of FIG.
An operation method when the workpiece 3 is ground by the multi-step grinding machine will be described. At the start of the processing, it conveyed the workpiece 3 to the loader unit 45 side of the first working position P ₁ by the external transport device. When the axis of the workpiece 3 substantially coincides with the axis of the loader device 45, the loader device
The operation of 45 causes the loader chuck 62 to grip the workpiece 3. In this case, it is difficult to match the axis of the workpiece 3 with the axis of the loader 45 by an external transfer device, but the outer periphery of the cylindrical portion 1 of the workpiece 3 is gripped by the loader chuck 62 at three equal positions. This allows the axis of the workpiece 3 to be aligned with the axis of the loader device 45.

[0022] The next rapid traverse of X ₁ axis slide table 57, X ₁ axial loader device 45 as the axis of the loader 45 coincides with the axis of the first working position P ₁ side of the main shaft 49 of the spindle device 41 Move to. Note that these axes may be matched from the beginning. Spindle 49 of the spindle 41 axis of the first working position P ₁ side of the loader 45
If coincident with the axis, the fast-forward a predetermined amount of Z ₁ axis slide table 58, the loader 45 is moved to the Z ₁ axial direction, the workpiece 3 which loader chuck 62 gripping a first work position P ₁ side of the workpiece chuck of the main spindle 41
Attach to 50.

[0023] When mounting the workpiece 3 in the workpiece chuck 50 of the spindle device 41, after retracting the loader 45, by rapid traverse of Z ₁ axis slide table 58 and the X ₁ axis slide table 57, Figure 2 and the groove grinding apparatus 44 as shown in FIG. 3 is moved in the Z ₁ axis and the X ₁ axis direction, to move the grindstone holder 53 having indexing sensor 56 at a predetermined position in the vicinity of the inner surface of the workpiece 3. Subsequently to pivot the workpiece 3 by the indexing rotation of the first working position P ₁ side of the main shaft 49 of the spindle device 41, provided in 3 uniformly arranged on the inner surface 4 of the workpiece 3 by using the indexing sensor 56 Nearest first inner groove
When the center line Sw of 6 is calculated, the turning of the spindle 49 of the spindle device 41 is stopped. At this time, as shown in FIG. 3, the center line Sw of the first inner groove 6 and the center line Sg of the groove grinding wheel 54 are in the same horizontal plane.

Next, when the main shaft 49 of the main shaft device 41 is turned by 180 degrees, the first inner groove 6 detected and indexed is moved to the groove grinding wheel.
Since it moves to the 54 side, the spindle 49 of the spindle device 41 is clamped at this position. Forward fast forward the X ₁ axis slide table 57 by moving the grooved grinding wheel 54 in the groove grinding position, then Z
Groove grinding wheel 54 by grinding feed of _single axis slide table 58
Thus, the inner groove 6 of the workpiece 3 is ground. First inner groove 6
If the groove grinding is completed, the fast forwarding of the X ₁ axis slide table 57 and Z ₁ axis slide table 58, groove grinding wheel
54 is retracted to the original groove grinding position.

Subsequently, the clamp of the main shaft 49 of the main shaft device 41 is released, the main shaft 49 is indexed and turned by 120 degrees, and the main shaft 49 is clamped again.
6 is ground with a groove grinding wheel 54. Similarly, grinding of the third inner groove 6 is performed, and when grinding of the first to third inner grooves 6 is completed, the Z ₁ axis slide table 58 and the X ₁ axis slide table 57 are rapidly fed to the loader device. The loader device 45 is moved to a position where the axis of 45 coincides with the axis of the spindle device 41, and the workpiece 3 on which all grinding has been completed is moved to the spindle device.
It stands by to detach from the work chuck 50 of 41 and take it out.

On the other hand, in the second working position P ₂ , the workpiece 3 already grooved is placed on the work chuck of the spindle device 42.
Attached to 50. Therefore, the first working position P ₁
On the side, at the same time as the separation operation for taking out the ground workpiece 3 by the loader device 45 as described later starts,
In the second working position P ₂ side performs internal grinding of the workpiece 3 by the inner surface grinding wheel 65 of the internal grinding device 46, also performs the slope grinding of the workpiece 3 by the slope grinding wheel 73 of the inclined surface grinding apparatus 47.

That is, on the side of the internal grinding device 46, the workpiece is processed by the internal grinding wheel 65 by the rapid feed and the grinding feed of the X ₂ axis slide table 66 and the Z ₂ axis slide table 67.
The inner surface 4 such as the inner surface on the near side, the bottom surface, and the inner surface on the back side of 3 are sequentially ground. Further, on the side of the slope grinding device 47, the slope 3 of the workpiece 3 is ground by the slope grinding wheel 73 by rapid feed and grinding feed of the X _3- axis slide table 75 and the Z _3- axis slide table 76. The actual grinding time is the longest for the inner surface grinding time for sequentially grinding the inner surface 4 such as the inner surface on the near side, the bottom surface, the inner surface on the back side of the workpiece 3, and the next is the slope of the workpiece 3.
5 is the slope grinding time to grind. Compared with this, the groove grinding time for grinding the inner groove 6 of the workpiece 3 is the shortest, and the groove grinding is completed in an extremely short time.

The second working position P ₂ internal grinding and slope grinding is completed at the end, if the groove grinding at the first working position P ₁ side is completed, the turntable 43 after unclamping, is pivoted indexing 180 Position and clamp again. This first working position spindle device 41 of P ₁ is the second working position P _2, also the spindle device 42 of the second working position P ₂ is then respectively moved to the first work position P _1, turntable 43 on The working positions P ₁ and P ₂ of the respective spindle devices 41 and 42 are switched, and the workpiece 3 after the groove grinding is moved to the second working position P ₂ to perform all grinding from groove grinding to inner surface grinding and slope grinding. It is the workpiece 3 after completing respectively located at the first working position P _1.

Therefore, on the first working position P ₁ side,
X ₁ axis slide table 57 and Z ₁ axis slide table 5
8, the loader chuck 62 of the loader device 45 grips the ground workpiece 3 on the flange portion 2 side, and the processed workpiece 50 is moved from the work chuck 50 of the headstock 48.
3 is removed and removed, and the processed workpiece 3 is transferred to an external transport device and transported out of the machine, and the next new workpiece 3 on the external transport device side is gripped. and it is mounted on the workpiece chuck 50 of the first working position the headstock 48 of P _1.

[0030] At this time, it performs internal grinding and slope grinding in the second working position P ₂ side. With this, a series of grinding processes of the workpiece 3 are completed, and when a large number of workpieces 3 are continuously ground, each workpiece 3 is sequentially ground in the same order. The shape and sharpness of the groove grinding wheel 54, the inner surface grinding wheel 65, and the inclined surface grinding wheel 73 are corrected by the corresponding dressing devices.

[0031] Thus the two spindle devices 41 provided on the turntable 43, to place the groove grinding machine 44 in the first working position P ₁ corresponding to the spindle device 41 of the one and the other spindle device by arranging the internal grinding device 46 and the inclined surface grinding device 47 in the second working position P ₂ corresponding to 42, during grinding of the inner surface 4 and the inclined surface 5 in the second work position P ₂ side, first working it is possible to perform the grinding operation of the inner groove 6 simultaneous parallel manner at position P ₁ side. Therefore, workpiece 3
It is possible to simultaneously grind a plurality of grinding surfaces, and the grinding time can be significantly reduced as compared with the grinding work using a conventional multi-step grinding machine.

Further considering that the shortest groove grinding time in particular compared to the internal grinding time and slope grinding time, since a groove grinding apparatus 44 and the loader unit 45 in the first working position P ₁ side, the inner surface During the internal grinding by the grinding device 46, the first
The workpiece 3 grinding already from the working position P ₁ side of the spindle device 41 is taken out by the loader 45, the spindle device 41
The following work 3 can be attached and detached. For this reason, the time difference between the inner surface grinding time and the groove grinding time is effectively used, and together with the reduction of the grinding time due to simultaneous grinding, the working time of the entire processing work of the workpiece 3, that is, the cycle time, is reduced. The work 3 can be greatly shortened, and the workpiece 3 can be processed quickly with high efficiency.

Further, two spindle devices 4 are mounted on the turning table 43.
Since the respective spindle devices 41 and 42 are replaced with _two positions P ₁ and P ₂ by indexing the turning table 43 by 180 degrees, the first working position P
_{If the} workpiece 3 is mounted on the spindle devices 41 and 42 on _one side, all the grinding can be performed only by rotating the turning table 43 by 180 degrees. Therefore, for each position
There is no need to re-install 3 and good grinding accuracy can be guaranteed.

In addition, since the turning table 43 only needs to be indexed once, there is no time loss when the turning table 43 is turned to switch the work process, and the working time can be further reduced. Since wearing the groove grinding apparatus 44 and the loader unit 45 in a common X ₁ axis slide table 57, X-Z
There are advantages such as being able to use the table and its drive system,
The whole structure can be simplified.

The embodiment of the present invention has been described above, but the present invention is not limited to this. For example,
In the embodiment, the turning table 43 has two spindle devices 41 and 42.
And the first working position P ₁ and the second working position P ₂ are provided around the turning table 43, but three or more spindle devices on the turning table 43 may be provided evenly. In this case, the same number of working positions as the number of spindle devices on the turning table 43 may be set equally. But,
The number of working positions does not necessarily have to be the same as the number of spindle devices, and the number of working positions can be smaller than the number of spindle devices.

In the embodiment, the first grinding portion of the workpiece 3 is defined as an inner groove 6, and a groove grinding device 44 for grinding the inner groove 6 is used.
The provided as a first grinding device in the first working position P ₁ side, the second grinding portion of the workpiece 3 and the inner surface 4, the third ground portion as a slope 5, the internal grinding apparatus 46 for grinding the inner surface 4 a second grinding device, but the slope grinding apparatus 47 for grinding the inclined surface 5 are respectively provided as the third grinding apparatus to the second work position P _2, the first to third ground portion of the workpiece 3 side to be processed The part other than the inner groove 6, the inner surface 4, and the slope 5 of the object 3 may be used. In this case, what is necessary is just to use the grinding wheel of each grinding device according to the grinding portion of the workpiece 3.

[0037]

According to the first aspect of the present invention, a plurality of spindle devices having a work chuck for gripping a workpiece, and a plurality of spindle devices that support the plurality of spindle devices and are provided with a plurality of spindle devices. And a turning table that is indexed and turned so as to correspond to each of the work positions.
A plurality of types of grinding machines are separately arranged so as to grind different grinding parts of the workpiece, and the grinding machine with the shortest grinding time is placed in the work position where the grinding machine has the shortest grinding time. Since the loader device for attaching and detaching the workpiece is provided, the entire machining time including the grinding time can be greatly reduced, and the workpiece can be efficiently and quickly and accurately ground while shortening the cycle time. According to the second aspect of the present invention, since the grinding device and the loader device having the shortest grinding time are provided on the common slide table,
The whole structure can be simplified.

According to the third aspect of the present invention, the rotary table is provided with two spindle devices at point symmetric positions, and the first of the two working positions corresponding to the two spindle devices is provided.
On the working position side, an inner grinding device and a loader device for grinding the first grinding portion of the workpiece are arranged, and on the second working position side, a second grinding device for grinding the second grinding portion of the workpiece. Since the third grinding device for grinding the third grinding portion of the workpiece is disposed, the work of attaching and detaching the workpiece and the grinding operation of the first grinding portion are performed at the first work position, and the second work is performed. The grinding operation of the second grinding portion and the third grinding portion can be performed at the position. According to the fourth aspect of the present invention, the grinding device having the shortest grinding time is used for grinding a groove of a workpiece, and a grinding wheel holder of the grinding device detects a groove grinding position of the workpiece and the grinding device. Since the indexing sensor for stopping the rotation of the spindle device corresponding to the working position on the side is provided, it is possible to easily and reliably detect and index the groove grinding position.

[Brief description of the drawings]

FIG. 1 is a plan view of a multi-step grinding machine showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of an inner groove grinding step showing one embodiment of the present invention.

FIG. 3 is a cross-sectional view of an inner groove grinding step showing one embodiment of the present invention.

FIG. 4 is a processing step diagram showing one embodiment of the present invention.

FIG. 5 is a sectional view of a workpiece.

FIG. 6 is a plan view of a conventional multi-step grinding machine.

FIG. 7 is a conventional work process diagram.

FIG. 8 is a sectional view of a conventional inner groove grinding step.

[Explanation of symbols]

3 Workpiece 4 Inner surface (second grinding part) 5 Slope (third grinding part) 6 Inner groove (first grinding part) 41,42 Spindle device 43 Turning table 44 Groove grinding device (first grinding device) 45 Loader device 46 inner surface grinding apparatus (second grinding device) 47 slope grinding device (third grinding apparatus) 50 workpiece chuck 53 grindstone holder 56 indexing sensor P ₁ first working position P ₂ a second working position

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI // B23Q 39/04 B23Q 39/04 A (56) References JP-A-2-109673 (JP, A) JP-A-48- 99793 (JP, A) JP-A-3-79201 (JP, A) JP-A-3-208502 (JP, A) Table 7-7-505095 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24B 25/00 B24B 41/04 B24B 41/06 B23Q 39/04 B23B 3/30

Claims (4)

(57) [Claims] 1. A plurality of spindle devices having a work chuck for gripping a workpiece, and indexing such that each of the plurality of spindle devices supports the plurality of spindle devices and corresponds to each of a plurality of working positions. A swivel table is provided, and in each work position, a plurality of types of grinding devices are separately arranged so as to grind different grinding portions of the workpiece, and the work position where the grinding device with the shortest grinding time is located is located in the work position. A multi-step grinding machine characterized by disposing a loader device for attaching and detaching a workpiece to and from a work chuck of a spindle device on a working position side. 2. The multi-step grinding machine according to claim 1, wherein the grinding device and the loader device having the shortest grinding time are provided on a common slide table. 3. A rotary table is provided with two spindle devices at point-symmetric positions, and a first work position of a first work position of two work positions corresponding to the two spindle devices is provided. A first grinding device and a loader device for grinding a grinding portion are arranged, and a second work position
The multi-step grinding machine according to claim 1 or 2, wherein a second grinding device for grinding a grinding portion and a third grinding device for grinding a third grinding portion of the workpiece are arranged. 4. A grinding device having the shortest grinding time is used for groove grinding of a workpiece, and a grinding wheel holder of the grinding device detects a groove grinding position of the workpiece and shifts to a working position on the grinding device side. 3. The multi-step grinding machine according to claim 1, further comprising an indexing sensor for stopping rotation of a corresponding spindle device.