JP2000127017A - Multi-process grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-process grinding machine capable of largely shortening the total machining time including the grinding time and capable of grinding a work efficiently and quickly at high precision. SOLUTION: This multi-process grinding machine is provided with multiple main spindle devices 41, 42 each having a work chuck 50 for grasping a work 3 and a rotary table 43 supporting multiple main spindle devices 41, 42 and index-rotated so that the main spindle devices 41, 42 correspond to multiple work positions P1, P2 respectively. Multiple grinding devices 44, 46, 47 are arranged at the work positions P1, P2 to grind different ground portions of the work 3.

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 are ground, and the inner surface 4 and the inner surface 4 are equally arranged on the inner surface 4. When grinding the groove 6, a single-step grinding method is used in which multiple single-function machines are used and the machine is changed for each grinding part, while each grinding is performed using a multi-step grinding machine with multiple functions. There is a multi-step grinding method in which a part is sequentially ground by one machine.

[0004] 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.

[0005] 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 respective grinding portions of the inner surface 4, the slope 5 and the inner groove 6 can be sequentially ground in that state, There is no need to remount the workpiece 3 to the work chuck, the grinding time can be shortened compared to the single-step grinding method, the grinding accuracy is greatly improved, and the workpiece 3 is transported between machines. There are advantages such as not requiring a transport device.

The 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 headstock device 8 includes a headstock 33 and the headstock 33.
A work chuck 15 mounted on the tip of the main shaft of the main shaft, and a main shaft motor 16 for driving the work chuck 15 through the main shaft. The U-axis slide 17 and the U-axis Is slidably mounted on.

The internal grinding device 9 comprises an internal grinding wheel base 19 and
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.

[0010] When the workpiece 3 is to be ground, 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, in 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 inside the work 3. In such a manner, the indexing rotation of the main spindle is performed to perform the equal distribution indexing, and the work piece is processed by the groove grinding wheel 14 of the groove grinding device 11.
Each of the inner grooves 6 is sequentially ground at three equal positions a to c. When the groove grinding of the inner groove 6 is completed, the turning table 24
Grinder 11 at work position P
Is replaced with the internal grinding device 9, and the ground workpiece 3
Is detached from the work chuck 15 and taken out.

[0013]

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, in the conventional multi-step grinding method, the inner groove 6 cannot be ground while the inner surface 4 and the inclined surface 5 are being ground. Therefore, there is a disadvantage that the grinding time is lengthened by the grinding time of the inner groove 6 as compared with the case where the inner surface 4, the inclined surface 5 and the inner groove 6 are ground simultaneously.

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,
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.

[0018]

SUMMARY OF THE INVENTION The present invention is directed to a plurality of spindle devices having a work chuck for gripping a workpiece, and each of the spindle devices is supported and each of the spindle devices has a plurality of working positions. And a revolving table for indexing and revolving so as to respectively correspond to the above-mentioned items, and a plurality of types of grinding devices are separately arranged at the respective working positions so as to grind different grinding portions of the workpiece.

[0019]

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 and 42 on the bed 40. Spindle device
A turning table 43 for supporting the _first and second working positions P ₁ and P ₂ by 180 degrees so as to support the _first and second working positions P ₁ and P ₂ , respectively; a groove grinding apparatus 44 and the loader unit 45 arranged in the position P ₁ side, and a internal grinding device 46 and the inclined surface grinding apparatus 47 disposed on the second working position P ₂ side on the bed 40.

In this embodiment, as will be described later, the groove grinding time by the groove grinding device 44 is reduced by the inner surface grinding device 46.
Is shorter than the time required for the inner surface grinding and the time required for the slope grinding by the slope grinding device 47.
Loader 45 is arranged in the first working position P ₁ side with.

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. A work chuck 50 for detachably holding the cylindrical portion 1 side of the workpiece 3 is provided.

The axes of the spindles 49 are parallel to each other at the same height, and the rotary table 43 is rotated by 180 degrees to rotate the spindle devices 41 and 42 to the respective working positions P ₁ and P ₁ .
₂ are attached to the headstocks 48 so that their axes coincide with each other. Each spindle device 41, 42
Has a spindle motor 51 that drives the spindle 49 to rotate.

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 device 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.

[0026] Incidentally, the X ₁ axis slide table 57, Z ₁ axis slide table 58 and Z ₁ axis slide 59, X-
A Z table is configured.

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 has a first working position P ₁
In the above, the workpiece 3 before processing is mounted on the work chucks 50 of the spindle devices 41 and 42, and the processed workpiece 3 is detached from each work chuck 50 and taken out of the machine. , comprising a loader chuck 62 to grip the detachable flange portion 2 side of the workpiece 3 is mounted on the X ₁ axis slide table 57 at the side of the groove grinding apparatus 44.

The inner grinding device 46 includes an inner 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.

[0030] 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.

It should be noted, by the X ₂ axis slide table 66, Z ₂ axial slide table 67 and the Z ₂ axial slide 68, X-
A Z table is configured.

The slope grinding device 47 includes a slope grinding wheel table 71,
A grindstone shaft 72 rotatably supported around the axis by the bevel grinding wheel stand 71, a bevel grinding wheel 73 attached to the tip of the grindstone shaft 72, and an integral drive of the bevel grinding wheel 73 with the grindstone shaft 72. And a slope grinding motor 74. The slope grinding device 47, X ₃ axis slide table 7 on the bed 40
5, Z _3-axis slide table 76 and through the Z _3-axis slide 77 is slidably supported in the X ₃ axis and Z ₃ axially, the headstock 48 axis of the grinding wheel shaft 72 of the inclined surface grinding wheel head 71 spindle It is the same as the 49 axis.

[0033] 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.

[0034] Incidentally, the X ₃ axis slide table 75, Z _3-axis slide table 76 and Z _3-axis slide 77, X-
A Z table is configured.

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.

[0036] 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 45 is activated and the workpiece 3 is gripped by the loader chuck 62.

In this case, it is difficult to make the axis of the workpiece 3 coincide with the axis of the loader 45 by an external transfer device. However, the outer periphery of the cylindrical portion 1 of the workpiece 3 is equally distributed by the loader chuck 62 in three directions. By gripping at the position, the axis of the workpiece 3 can be matched with the axis of the loader device 45.

[0038] 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.

[0039] When 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, Z ₁
The predetermined amount of fast forward axis slide table 58, and the loader 45 is moved to the Z ₁ axial direction, the loader chuck 62
There workpiece 3 to grip, mounted to the workpiece chuck 50 of the first working position P ₁ side of the spindle device 41.

[0040] 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, the workpiece 3 is turned by the indexing rotation of the spindle 49 of the spindle device 41 on the first working position P ₁ side, and the indexing sensor 56 is used to arrange the workpiece 3 on the inner surface 4 of the workpiece 3 at three equal intervals. The center line Sw of the nearest first inner groove 6 provided
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 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 inserted into the groove grinding wheel.
Since it moves to the 54 side, the spindle 49 of the spindle device 41 is clamped at this position.

[0043] The groove grinding wheel 54 is moved into the groove grinding position by advancing fast forward the X ₁ axis slide table 57, then Z ₁
The inner groove 6 of the workpiece 3 is ground by the groove grinding wheel 54 by the grinding feed of the shaft slide table 58. If the groove grinding of the first inner groove 6 is completed, X ₁ axis slide table 57 and Z
_With the rapid movement of the _single- axis slide table 58, the groove grinding wheel 54
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 again clamped.
6 is ground with a groove grinding wheel 54.

The grinding of the third inner groove 6 is performed in the same manner. When the 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. Then, the loader device 45 is moved to a position where the axis of the loader device 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 work chuck 50 of the spindle device 41.
Wait to get out of and take out.

On the other hand, on the second working position P ₂ side, the workpiece 3 already grooved is placed in 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 starting the detaching operation to remove the ground workpiece 3 by the loader device 45 as described later,
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 in the inner surface grinding time for sequentially grinding the inner surface 4 such as the inner surface on the front side, the bottom surface, and the inner surface on the back side of the workpiece 3, and the next is the slope 5 of the workpiece 3. It is the slope grinding time for grinding. Workpiece compared to this
The groove grinding time for grinding the inner groove 6 of 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 work 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 completed at the second work position P ₂ , all the grinding operations from the groove grinding to the inner surface grinding and the slope grinding. It is the workpiece 3 after 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.

[0051] At this time, it performs internal grinding and slope grinding in the second working position P ₂ side.

Thus, a series of grinding processes of the workpieces 3 are completed, and when a large number of workpieces 3 are to be continuously ground, the respective workpieces 3 are 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.

[0054] 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.

[0055] 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, 42 on _one side, all grinding can be performed only by rotating the turntable 43 by 180 degrees. Therefore, for each position
There is no need to re-install 3 and good grinding accuracy can be guaranteed.

Moreover, since the indexing table 43 only needs to be rotated once, there is no time loss required for switching the work process by rotating the table 43, and the working time can be further reduced.

The groove grinding device 44 and the loader device 45 share the same X ₁
Since it is mounted on the shaft slide table 57, it has advantages such as being able to use the XZ table and its drive system, and the entire 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 is provided with two spindle devices 41 and 42 and the turning table 43 is provided.
First working position P ₁ around the second are provided and a working position P _2, the spindle device in the turn table 43 may be provided equidistantly on the three or more. In that case, the swivel table
The same number of work positions as the spindle device on 43 may be set equally.

However, the number of working positions does not necessarily have to be equal to 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 the inner groove 6, and the 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.

A plurality of spindle devices 41 and 42 having a work chuck 50 for gripping the workpiece 3 and a plurality of spindle devices 41 and 42 supporting the plurality of spindle devices 41 and 42 are provided. A turning table 43 for indexing and turning so as to correspond to a plurality of work positions P ₁ and P ₂ , respectively, and a plurality of kinds of work positions P ₁ and P ₂ for grinding different grinding portions of the workpiece 3 Grinding devices 44, 46, 47 are arranged separately,
The working position P _{1 with} the grinding device with the shortest grinding time,
To P _2, the spindle device of the work positions P _1, P ₂ side 41 and 42
If the loader device 45 for attaching and detaching the workpiece 3 to and from the workpiece chuck 50 is arranged, the entire machining time including the grinding time can be significantly reduced, and the
3 can be efficiently and quickly ground with high precision.

If the grinding device 44 and the loader device 45 with the shortest grinding time are provided on the common slide tables 57 and 58, the overall structure can be simplified.

Further, two spindle devices 41 and 42 are provided on the turning table 43 at point symmetric positions, and the first of the two working positions P ₁ and P ₂ corresponding to the two spindle devices 41 and 42 is the first one. the working position P ₁ side, is disposed a first grinding apparatus 44 and the loader 45 for grinding the first ground portion of the workpiece 3, the second
The working position P ₂ side, by arranging the second grinding apparatus 46 for grinding the second grinding portion of the workpiece 3, and a third grinding apparatus 47 for grinding the third ground portion of the workpiece 3, perform the grinding work of mounting and dismounting a first grinding region of the workpiece 3 in the first working position P _1, it can be carried out in the second work position P ₂ and the second grinding site grinding operation of the third ground portion .

The grinding device 44 having the shortest grinding time is used for the groove grinding of the workpiece 3.
In 53, the groove grinding position of the workpiece 3 is detected and the grinding device 44 is detected.
If provided indexing sensor 56 for stopping the rotation of the spindle devices 41 corresponding to the working position P ₁ side, the detection of the groove grinding position, it is possible to perform the indexing easily and reliably.

[0067]

According to the present invention, a plurality of spindle devices having a work chuck for gripping a workpiece, each of the spindle devices is supported, and each of the spindle devices corresponds to a plurality of working positions. And a turning table for indexing and turning, and multiple types of grinding devices are separately arranged at each work position so as to grind different grinding parts of the workpiece. The workpiece can be efficiently and quickly and precisely ground while shortening the cycle time.

Further, the spindle devices are equally arranged on the turning table, and the respective working positions are equally arranged. Of the respective working positions, a first grinding portion of the workpiece is provided on the first working position side. A first grinding device for grinding, a second grinding device for grinding a second grinding portion of the workpiece, and a third grinding device for grinding a third grinding portion of the workpiece on the second working position side; Are arranged, it is possible to perform the grinding work of the first grinding portion at the first working position and perform the grinding work of the second grinding portion and the third grinding portion at the second working position.

Further, since the second work position is provided with the inner surface grinding device and the inclined surface grinding device for simultaneously performing the inner surface grinding and the inclined surface grinding of the workpiece, the entire machining time including the grinding time can be greatly reduced.

Further, the groove grinding device is provided with a groove grinding wheel for groove grinding a workpiece and a rotation of a spindle device corresponding to the groove grinding device by detecting a grinding position of the workpiece on a tip side of a grinding wheel holder. Since the indexing sensor for stopping 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

Claims (5)

[Claims] 1. A plurality of spindle devices having a work chuck for gripping a workpiece, and index turning so as to support each of the spindle devices and to correspond to each of a plurality of working positions. A multi-step grinding machine, comprising: a plurality of types of grinding devices separately provided at each of the work positions so as to grind different grinding portions of the workpiece. 2. The method according to claim 1, further comprising: disposing the spindle devices on the turning table at equal intervals; and providing the respective working positions at equal intervals. A first grinding device for grinding a first grinding portion is disposed, and a second grinding device for grinding a second grinding portion of the workpiece and a third grinding portion of the workpiece are provided on a second working position side. The multi-step grinding machine according to claim 1, further comprising a third grinding device for grinding. 3. The multi-step process according to claim 2, wherein the second working position is provided with an inner surface grinding device and an inclined surface grinding device for simultaneously performing the inner surface grinding and the inclined surface grinding of the workpiece. Grinder. 4. The multi-step grinding machine according to claim 2, wherein a groove grinding device for performing groove grinding of the workpiece is provided at the first working position. 5. The groove grinding device according to claim 1, further comprising: a groove grinding wheel for groove-grinding the workpiece, and a grinding position corresponding to the groove grinding apparatus detecting a grinding position of the workpiece on a tip side of a grinding wheel holder. The multi-step grinding machine according to claim 4, further comprising an indexing sensor for stopping rotation of the spindle device.