JPS6243726Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a forming grinder such as an optical copying grinder, and more specifically to a forming grinder that is provided with a dresser shaft in close proximity to a main shaft that supports a workpiece.

Conventionally, the dressing of a grinding wheel used in a grinding machine is generally done by attaching a diamond tool to a separate dresser device, or by attaching a dresser shaft with a diamond tool attached to the workpiece mount of the grinder. It was hot.

However, as mentioned above, in dressing work, the installation of the grindstone, workpiece, and dresser shaft,
There was a problem that removal required a lot of time and effort, and work efficiency was extremely poor.

For surface grinding machines, it has been proposed that a dresser is attached to a part of the table on which the workpiece is attached in order to improve work efficiency, but in forming grinders such as optical copying grinders, the workpiece In order to rotate the workpiece, it is difficult to provide a dresser on the table that supports the workpiece, and the above-mentioned problems still remain.

This invention was devised in order to effectively solve the conventional problems, and its purpose is to create a single servo motor whose rotation is controlled by commands from an NC device. and a gear device connected thereto, so that the workpiece support table and the dresser shaft can be rotated and controlled respectively, and when the workpiece support table and the dresser shaft tend to rotate during machining, it is possible to To provide a forming grinder that can efficiently grind a workpiece by preventing rotation.

Hereinafter, a preferred embodiment of this invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 1 indicates an automatic dresser device main body whose operation is controlled by commands from a numerical control device 3 (NC device 3), and this device main body 1 mainly includes a dresser device 7 installed on a bed 5, The dresser device 7 includes a grinding device 9 provided adjacent to the dresser device 7.

The dresser device 7 includes an X2 table 11 that is slidable in the left and right directions on the bed 5 in FIG.
and a Z2 table 13 which is placed on the X2 table 11 so as to be slidable in a direction perpendicular to the X2 table 11. Both tables 11,1
Reference numeral 3 denotes a first servo motor 15 and a second servo motor 17 whose rotations are controlled by commands from the NC device 3, and a transmission device (gear mechanism,
The amount of movement is controlled via the Y-axis, Y-axis, etc.).

A two-stage gear device 23 is installed on one side of the Z2 table 13 for rotationally driving a dresser shaft 19 and a work support table 21, which will be described later, synchronously or only the latter.

As shown in FIGS. 3 and 4, this two-stage gear device 23 has the dresser shaft 19 and a main shaft 27, which has a workpiece support table 21 attached to its upper end, housed in a gear case 25, as shown in FIG. Z
They are erected at predetermined intervals in the axial direction (vertical direction in FIG. 3) and the X-axis direction (horizontal direction in FIG. 3). The main shaft 27 is rotatably housed in the gear case 25 via a bearing 31, and a main shaft gear 37 is attached to a part of the outer periphery of the main shaft 27 via a key 35. The dresser shaft 19 is rotatably supported by a gear case 25 via a bearing 39, and a gear 45 is attached to the base end of the dresser shaft 19 via a key 43.

Gears 37 and 45 are provided between the main shaft gear 37 and the gear 45 provided on the dresser shaft 19.
An idle gear 47 having an E-shaped cross section is interposed to mesh with the gear. The idle gear 47 includes a first gear 47a that meshes with the main shaft gear 37 and a second gear 47b that meshes with the gear 45, which are integrally formed. Note that the rotation speed of the dresser shaft 19 and the main shaft 27
When the ratio of the number of rotations to
As a result, the main shaft 27 has four origins in one rotation.

Next, the main shaft gear 3 with which the idle gear 47 meshes
A worm gear device is provided on the opposite side of 7. That is, as shown in FIG. 3, a worm gear 49 disposed orthogonally to the main shaft 27 meshes with the transmission shaft 51 to which the worm gear 49 is attached.
is rotatably supported via a bearing 53. A transmission gear 55 is attached to one end of the transmission shaft 51, and this transmission gear 55 is connected to a third servo motor 57 attached to the side wall of the gear case 25.
drive path gear 59 and gear 6 of the pulse transmitter 61
3 are engaged with each other. Therefore, the rotational driving force of the third servo motor 57 is transmitted to the main shaft 27 via the drive gear 59, the transmission gear 55, the transmission shaft 51, the worm gear 49, and the main shaft gear 37, respectively. Work support table 21
At the same time, it is also driven to enable full rotation and reversible rotation. On the other hand, the dresser shaft 19 is
As the main shaft 27 rotates, the main shaft gear 37, the first gear 47a of the idle gear 47, the second gear 47b,
The dresser shaft 19 is rotationally driven through a gear 45.
A diamond tool 67, which is detachably attached via a jig 65 at an eccentric position at the tip thereof, is also rotated at the same time. Further, a sensor 69 is provided at the base end of the dresser shaft 19 to detect the number of revolutions of the dresser shaft 19, thereby setting the origin.

With the above configuration, the rotation of the main shaft 27 and the dresser shaft 19 can be controlled by one servo motor 57. In addition, when processing a workpiece or forming the grindstone P with the rotation of the main shaft 27 and the dresser shaft 19 stopped, the main shaft 27 and the dresser shaft 1
Even if 9 tends to be rotated, the rotation can be reliably stopped.

Note that the main shaft 27 and the dresser shaft 19 are
The servo motor 57 rotates synchronously, but if a clutch mechanism (not shown) is provided in the idle gear 47, the dresser shaft 19 can be rotated while the workpiece W is being processed. It is also possible to keep it stopped.

Next, the grinding device 9 is installed on the bed 5 on the left side of the dresser device 7 in FIG _. Table 71 and this X ₁
A Z _1- axis table 73 is provided which is slidably mounted in a direction orthogonal to the axis table 71. This _X1 axis is automatically advanced minutely by a solenoid so that the grinding wheel dressing can perform automatic cutting. This automatic minute advance is automatically controlled by auxiliary commands from the NC device 3.

On the Z _1- axis table 73, there is a grindstone mounting No. 75.
A lifting transmission device 79 that moves up and down freely in the direction orthogonal to the X _1- axis and Z _1- axis tables 71 and 73, that is, the Y-axis direction, and the grindstone mounting shaft 77 provided at the grindstone mounting No. 75 are rotatable. A grindstone shaft rotation electric device 80 for control is installed. Lifting electric device 7
9 and the grindstone shaft rotating electric device 80 are connected to the electric case 8.
1, and within this electric case 81 is a mechanism (not shown) for raising and lowering the grindstone mount 75.
and a mechanism (not shown) for rotationally driving the grindstone mounting shaft 77 are housed. Lifting transmission device 7
9 and the grindstone shaft rotating electric device 80 are rotatably controlled based on an auxiliary command from the NC device 3.

Note that the X _1- axis table 71 and the Z _1- axis table 73 placed on the bed 5 can be manually operated by a manual horizontal feed handle 83 and a manual vertical feed handle 85, respectively.

Further, in FIGS. 1 and 2, 87 is a microscope or a projector mounted on the upper part of the dresser device 7, and is used to set the forming process of the grindstone P.

Next, the operation of this embodiment constructed as described above will be explained.

(1) Shaping of the whetstone P When shaping the whetstone P attached to the whetstone mounting shaft 77 of the grinding device 9 into a predetermined shape (dressing), first the diamond tool 67 of the dresser device 7 is applied to the whetstone P. move it to the specified position. This diamond tool 67
The movement operation is performed by operating the NC device 3 and driving the first servo motor 15 and the second servo motor 17, respectively, based on a predetermined command issued from the NC device 3.
The Z2 table 13 and the X2 table 11 are
Each is moved by a predetermined amount in a predetermined direction. After the positioning of the diamond tool 67 is completed in this way, the third servo motor 57 provided in the two-stage gear device 23 is driven and controlled by a command from the NC device 3.

As described above, the rotational driving force of the third servo motor 57 is transmitted to the main shaft 27 via the drive gear 59, the transmission gear 55, the transmission shaft 51, the worm gear 49, and the main shaft gear 37. The dresser shaft 1 is connected to the dresser shaft 1 through the first gear 47a of the gear 47, the second gear 47b, and the gear 45.
9.

When the dresser shaft 19 is rotationally driven, a diamond tool 67 attached to its tip via a jig 65 rotates.

As described above, when the X2 table 11 and the Z2 table 13 are moved and the rotating diamond tool 67 approaches the grindstone P to a predetermined position, the _X1 axis table 71 of the grinding device 9 is moved. is finely advanced in the _X1 axis direction, that is, in the right direction in FIG. 1, via a servo motor (not shown) driven based on an auxiliary function command from the NC device 3. Dressing is then carried out by bringing the grindstone P into contact with the diamond tool. Note that the dressing amount of the grindstone P is set in advance based on the amount of movement of the X1-axis table.

In this way, the grinding wheel P is formed into a predetermined shape (for example, R-shape), and this processing shape is set using a microscope or a projector 87 provided at the top of the dresser device 7. It is something.

Further, the shape that can be formed by the grindstone P by the dresser device 7 of this embodiment is, for example, the sixth shape.
These are as shown in 1 to 1 (eight types) in the figure, but are not limited to these types.

Furthermore, when forming both ends of the R-shaped grindstone P linearly, an X2 table 11,
This is possible by controlling the movement of the Z2 table 13 by a predetermined amount.

(2) Grinding of the workpiece W Next, the grinding of the workpiece W is performed by applying the third servo motor 57 and the two-stage gear device to the grinding wheel P that has been formed with high precision according to (1) above. The workpiece support table 21 on the main shaft 27, which is rotatably driven via the X2 table 11 and the Z2 table 13, is brought closer together with the X2 table 11 and the Z2 table 13 by controlling the first servo motor 15 and the second servo motor 17, respectively. And the work support table 21
The workpiece W gripped by the chucking jig 33 attached above and rotating together with the main shaft 27 and the workpiece support table 21 is brought into contact with the grindstone P, and the entire circumferential surface of the workpiece W is shaped into the desired shape with high precision. It is something that will be completed.

Note that the dresser shaft 19 does not necessarily need to be rotated at the same time as the main shaft 27 connected to the workpiece support table 21, so a clutch/brake (not shown) provided at the idle gear 47 is used to rotate the dresser shaft 19 at the same time as the workpiece support table 21. It is also possible to stop the W grinding process.

Further, the servo motor used as the drive device in this embodiment may be any one of an electric servo motor, a hydraulic servo motor, an electric pulse motor, an electro-hydraulic pulse motor, and the like.

As can be understood from the above explanation of the embodiments, the gist of the present invention is as stated in the scope of the claims for utility model registration, and as is clear from the description, the present invention A grindstone mount that rotatably supports a grindstone mount is provided for reciprocating motion in the X-, Y-, and Z-axes directions, and a gear case that rotatably supports a main shaft onto which a workpiece can be attached and detached is installed in the X-axis and Z-axis directions. This invention relates to a forming grinder that is capable of reciprocating. The dresser shaft rotatably supported by the gear case is spaced apart from the main shaft in the Z-axis direction parallel to the extending direction of the grindstone mounting shaft provided with the grindstone, and
It is also spaced apart in the X-axis direction so that it is closer to the grindstone than the main shaft. That is, it is provided at a position protruding toward the grindstone.

Therefore, when forming a grinding wheel, the dresser shaft approaches the grinding wheel before the main shaft.
Even when a workpiece with a large diameter is mounted on the upper part of the spindle, the workpiece will not interfere with the grindstone mount side. Furthermore, when forming the outer periphery of a small-diameter grinding wheel in a forming grinder so that the cross-sectional shape forms a convex circular arc, it is necessary to position it so that the center of the circular part coincides with the axis of the dresser shaft. As a result, the grindstone mount and gear case come very close to each other, but this invention does not cause any problems.

Further, in the present invention, the main shaft is interlocked with a servo motor via a worm gear device, and the main shaft and the dresser shaft are provided so as to be interlocked with each other. Therefore, the rotation of the main shaft and the dresser shaft can be controlled with one servo motor, which simplifies the configuration. Furthermore, since it is linked to the servo motor via a worm gear device, it can be used to index and process a workpiece mounted on the main spindle, or to stop the rotation of the dresser spindle to form a grindstone. In this case, even if the main shaft and dresser shaft tend to rotate during processing, rotation can be reliably prevented. That is, the rotational positioning of the main spindle and dresser shaft can be performed with a simple configuration without using a brake device or the like, and machining work can be performed immediately without the need for fixing the main spindle and dresser spindle. This improves work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front view of the automatic dresser device of this embodiment, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a plan view of the two-stage gear device taken across from the - line in FIG.
Fig. 4 is a longitudinal sectional side view taken along the - line in Fig. 2, Fig. 5 is a bottom view as seen from - arrow in Fig. 3, and Fig. 6 is a -
FIG. 6 is an explanatory diagram showing the types of grindstone forming processes. Main symbols in the drawings: 5...Bed, 11...
X2 table, 13...Z2 table, 15, 17
...First and second servo motors, 57... Third servo motor, 23... Two-stage gear device, 21... Work support table, 19... Dresser shaft, 71...
X _1- axis table, 73...Z _1- axis table, 79...
... Lifting electric device, 9... Grinding device.

Claims (1)

[Scope of utility model registration request] A grindstone mounting base 7 rotatably supports a grindstone mounting shaft 77 that has a grindstone P at its tip and extends in the Z-axis direction.
5 is installed on one side of the bed 5 so as to be able to reciprocate in the X-axis, Y-axis, and Z-axis directions, and the bed 5
A gear case 25 attached to the other side of the top is provided so as to be able to reciprocate in the X-axis and Z-axis directions, and a diamond tool 67 is provided at an eccentric position on the top, and extends in the Y-axis direction to allow the gear case 25 to freely rotate. A supported dresser shaft 19 and a main shaft 27 on which a work W can be freely attached and detached and which is rotatably supported on a gear case 25 are provided to be separated from each other in the Z-axis direction, and the dresser shaft 19 is placed further away from the main shaft 27. In order to be close to the grindstone P, the dresser shaft 19 and the main shaft 27
are provided spaced apart in the X-axis direction, and the gear case 2
A forming grinding machine characterized in that a servo motor 57 attached to a servo motor 57 and the main shaft 27 are interlocked with each other via a worm gear device, and the main shaft 27 and the dresser shaft 19 are provided so as to be freely interlocked.