JPH0520229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a grinding machine equipped with a dressing device for a grindstone.

Conventional technology Conventionally, as this type of grinding machine, for example,
As shown in Japanese Patent Publication No. 47-46433 published on November 22nd, there is a table member in which a workpiece mounting portion and a dresser are provided on the same table member. However, according to this conventional configuration, as shown in FIG. 1, the dresser 1 is provided on the table 2, so when dressing the grindstone 3 that has ground the workpiece W, the table 2 must be moved in the left-right direction. It is necessary to move the dresser 1 and the grindstone 3 so that their horizontal positions match. Therefore, time and a special control program are required to move the table 2, which not only reduces work efficiency but also complicates the control mechanism. Moreover, according to this conventional configuration, the dresser 1
Since the dresser 1 is constantly moving together with the table 2, it is difficult to stop the dresser 1 in a position that perfectly matches the grinding wheel 3 during dressing, and slight deviations may cause the finished shape of the grinding wheel 3 to be irregular. It had the disadvantage of being accurate.

As other prior art, for example, the dressing device disclosed in Utility Model Application No. 188533, Microfilm, is a surface grinding machine with a horizontal grinding wheel, which detects the mounting position of the grinding wheel in the axial direction, and detects the mounting position of the grinding wheel from a predetermined position. This device has the function of correcting the dressing device, which is driven by a motor drive unit that outputs a position correction signal based on calculation of a relative difference, either when installed on a grindstone shaft or installed on a reciprocating table. In addition, special public service 1977-3116
The rotary dressing device disclosed in the publication is equipped with detection, calculation, and motor control means to maintain constant relative rotation as the diameter of the grinding wheel decreases, and is equipped with means for controlling the grinding wheel mounted on the grinding wheel head. The dressing head is rotatably mounted on a shaft and is provided with means for forward feeding.

In any case, I couldn't find anything that was placed on a saddle that would move the table orthogonally.

Purpose of the Invention This invention was made to solve the above-mentioned conventional problems, and its purpose is to eliminate unnecessary movement of the table during dressing by always aligning the left and right positions of the grindstone and dresser. This is a new grinding machine that can improve work efficiency by eliminating the above, simplify the control mechanism, and further improve the dimensional accuracy of the workpiece by making the finished shape of the grinding wheel accurate. Our goal is to provide the following.

Structure of the Invention In order to achieve the above-mentioned object, the present invention includes a saddle supported by a frame so as to be movable back and forth, and a table for holding a workpiece provided on the saddle so as to be movable back and forth. , a grinding machine comprising a grinding wheel for processing a workpiece and a grinding wheel head supported by the frame so as to be able to reciprocate up and down; It is attached to a support member provided on a saddle that is movable in parallel directions, perpendicular to the axis, and is configured to be vertically adjustable in position facing the attached grindstone. The main idea is that a dresser is installed whose operation is controlled by the operator.

Embodiment Hereinafter, an embodiment embodying the present invention will be described based on FIGS. 2 and 3.

A saddle 12 is provided on the top surface of the frame 11 of the grinding machine so as to be able to reciprocate back and forth by means of a guide rail 13 extending back and forth, and is supported by the frame 11 so as to extend back and forth through a connecting portion 14 protruding from the bottom surface thereof. It is connected to the front-rear feed screw shaft 15. A saddle drive motor 18 is connected to the front end of the longitudinal feed screw shaft 15 via a gear mechanism 16.
An NC control device 17 is connected to the saddle drive motor 18, and by rotating the saddle drive motor 18 in forward and reverse directions based on commands from the device 17, the saddle 12 is moved back and forth through the front and rear feed screw shaft 15. It moves back and forth.

A table 21 is supported in a reciprocating manner by a pair of front and rear rails 20 provided on the top surface of the saddle 12 so as to extend left and right, and the top surface thereof serves as a mounting surface 22 for holding a workpiece W by magnetic force or the like. At the same time, a drive cylinder 23 connected to the NC control device 17 is connected to the lower surface. As the cylinder 23 is driven, the table 21 holding the workpiece W is reciprocated in the left-right direction.

A column 25 is erected at the rear of the frame 11, and a vertically extending vertical feed screw shaft 26 is supported on the upper surface of the column 25 so as to be movable vertically by its screw action. A grindstone head 27 is fixed to the lower end of the vertical feed screw shaft 26, and a grindstone 29 is rotatably attached to the front end of the grindstone head 27 via an arm portion 28 so as to be positioned above the table 21. A grindstone drive motor 30 for rotationally driving the grindstone 29 is disposed at the rear of the grindstone head 27. Further, a head drive motor 31 connected to the NC control device 17 is installed at the top of the column 25, and a worm 33 is installed on the motor shaft. This worm 33 is connected to a worm wheel 32 that is rotatably supported on the upper surface of the column 25, and a screw hole (not shown) that engages with the vertical feed screw shaft 26 is formed in the axial center of the worm wheel 32. . As the head drive motor 31 rotates forward and backward, the vertical feed screw shaft 26 is moved up and down through the rotation of the worm wheel 32, so that the grindstone head 27 is reciprocated up and down. .

On the other hand, a dresser 37 having a diamond or the like on its upper end is attached to the rear upper surface of the saddle 12 via a holder 36 as a support member supported from below by a support portion 35 provided on the table 21. In this embodiment, the dresser 37 is located directly below the rotation axis of the grindstone 29.

Now, in the above configuration, in advance
The feed amounts of the saddle 12, table 21, and grindstone head 27 are stored in the NC control device 17, and
If the saddle drive motor 18, the drive cylinder 23, and the head drive motor 31 are each driven by the drive command signal output from the device 17, the grinding wheel 2
9, the workpiece W is ground into a predetermined shape. In this case, the grindstone drive motor 30 is connected to the NC control device 1.
It is also possible to control the operation by 7.

When dressing the worn whetstone 29 during this grinding work, if the front and back and up and down positions of the dresser 37 are stored in advance in the NC control device 17, the grindstone head 27 will be As shown in FIG. 3, the saddle 12 is moved upward or downward by a predetermined amount, and a new grinding surface is cut out on the outer periphery of the grindstone 29 by the dresser 37. Then, the dressed grindstone 29 returns to the movement path of the workpiece W as the saddle 12 moves backward, and then descends to a lower position where it contacts the workpiece W with a preset depth of cut, and is caused by the horizontal movement of the table 21. At the same time, the workpiece W is ground into a predetermined shape.

By the way, in the grinding machine of this embodiment, since the dresser 37 is provided on the saddle 12 at a position directly below the rotational axis of the grindstone 29, the NC
If the control device 17 moves the saddle 12 back and forth by a predetermined amount to bring the dresser 37 into alignment with the grindstone 26, the grindstone 29 can be dressed regardless of the horizontal position of the table 21. Therefore, unlike the conventional case where the dresser is installed on a table, there is no need to stop the table at the position where the dresser and the grindstone correspond.
Work efficiency can be improved by eliminating wasted time in moving and stopping the table 21, and the control mechanism can be simplified by omitting special control programs in the NC control device to stop the table in a fixed position. can be achieved. Furthermore, since the left and right positions of the dresser 37 and the grindstone 29 always match, there is no risk of misalignment between the two in the left and right direction, unlike in the past, and the grindstone 29 can be dressed into an accurate shape.
9 allows the workpiece W to be ground to desired dimensions and shape with high precision.

Another Embodiment Next, another embodiment of the present invention will be described based on FIGS. 4 to 9.

(1) In the embodiment shown in FIG. 4, a dresser 42 is provided so that its position can be adjusted longitudinally and vertically with respect to the saddle 12. That is, a support plate 40 as a support member is erected and fixed on the saddle 12, and a mounting base 41 is attached to the upper end of the support plate 40, and its position can be adjusted back and forth and up and down by the action of an inclined surface 41a provided on the lower surface. A dresser 42 is attached to the front end of the mount 41 with screws or the like so that it can be finely adjusted up and down.
46 is a fixing screw. With this configuration, it is possible to effectively deal with the size of the outer diameter of the grindstone 29. Further, in this embodiment, an indexing device 43 for indexing the grinding position of the work W at every predetermined angle is installed on the table 21, and the work W is held by a rotatable chuck 44. Note that this indexing device 43 has a shaft 45.
This makes it possible to rotate in the direction of the arrow shown in the figure, so that the axis of the workpiece W can be held in an inclined state.

(2) In the embodiment shown in FIG. 5, the longitudinal and vertical positions of the dresser 47 can be controlled by an NC control device. For this purpose, motors 48 and 49 for moving the dresser 47 up and down and back and forth are arranged on the saddle 12 and connected to an NC control device, respectively.

(3) In the embodiment shown in FIG. 6, a rotary dresser 50 is installed on the saddle 12. According to this rotary dresser 50, dressing of a particularly large grindstone 29 can be easily performed.

(4) In the embodiment shown in FIG. 7, dressers 52 are provided on the upper surface and both front and rear sides of a holder 51 fixed on the saddle. With this configuration, it is possible to easily dress not only the outer peripheral surface of the grindstone 29 but also both the front and rear sides thereof.

(5) In the embodiment shown in FIG. 8, a rotating body 54 is provided on the upper surface of a holder 53 fixed on the saddle so as to be rotatable by a predetermined angle in a horizontal plane.
A plurality of dressers 55 are supported on the circumferential surface of the dresser. According to this, it becomes easy to dress the grindstone 29 having the chevron-shaped outer circumferential surface.

(6) Fig. 9 shows the dressing of the grindstone 29 used for grinding by the total die method. As described in the previous embodiment, the saddle 12 and the table 2
If the operation of the grinding wheel 1 and the grinding wheel head 27 is controlled by an NC control device, it is possible to easily dress even the grinding wheel 29 having such a complicated shape.

Effects As detailed above, according to the present invention, by providing the dresser on the saddle, dressing operation can be performed regardless of the left and right position of the table. This eliminates the need for work efficiency, and simplifies the control mechanism.Furthermore, since there is no cause for error in positioning the left and right sides of the table, the finished shape of the grindstone becomes accurate and the dimensions of the workpiece are adjusted. This has the excellent effect of improving accuracy.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a main part showing a conventional dressing action, Fig. 2 is a right side view of a grinding machine showing an embodiment embodying the present invention, and Fig. 3 is a main part showing a dressing action of the present invention. The perspective view and FIGS. 4 to 9 are side views of main parts showing other embodiments of the present invention, respectively. Frame...11, Saddle...12, NC control device...17, Table...21, Grinding wheel head...
...27, Whetstone...29, Dresser...37,4
2. Workpiece W, support member...36,40.

Claims (1)

[Claims] 1 A saddle 12 supported by a frame 11 so as to be able to reciprocate back and forth, a table 21 for holding a work W provided on the saddle 12 so as to be able to reciprocate from side to side, and a grindstone for processing the work W. 29 and a grinding wheel head supported by the frame 11 in a vertically movable manner, the grinding wheel head 27 is provided on the same plane containing the axis of the grinding wheel head 27,
It is attached to support members 36 and 40 provided on the saddle 12 that is movable in a direction parallel to the axis, and is perpendicular to the axis and can be vertically adjusted to face the attached grindstone 29. configured and NC
A grinding machine characterized in that dressers 37 and 42 whose operation is controlled via a control device 17 are arranged.