JPH0752009A - Rotary grinding machine - Google Patents

Abstract

PURPOSE:To provide a rotary grinding machine capable of performing truing and dressing of a grinding wheel using truing grinding wheels. CONSTITUTION:A truing device 31 is loaded on the upper face of a saddle 2 so that truing grinding wheels 35, 36 can reciprocate in a direction that intersects the direction of movement of the saddle 2 at right angles. Thus, the truing grinding wheels 35, 36 can be reciprocated in a direction that intersects the axis-line of rotation of a grinding wheel 21 at right angles. As a result, the grinding efficiency of the grinding wheel 21 can be improved, and the peripheral grinding surface of the grinding wheel 21 can be formed with high precision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary grinder in which a table on which a work is placed rotates.

[0002]

2. Description of the Related Art Generally, in a rotary grinding machine, a saddle is reciprocally supported on a frame. A table on which a work is placed is rotatably supported on the saddle. The grindstone for grinding the work is supported by a rotary shaft that is substantially parallel to the upper surface of the table.

When grinding a work, the work is placed on the table and the table is rotated. Next, the grindstone is lowered to bring it into contact with the upper surface on the outer peripheral side of the work. In this state, the saddle is moved so that the contact position between the work and the grindstone is gradually moved from the work outer peripheral side to the work center side. Then, after the contact position reaches the work center side, the saddle is moved to the opposite side, and the contact position between the work and the grindstone is gradually moved from the work center side to the work outer peripheral side. In other words, while reciprocating the saddle, cut the grindstone little by little,
The work is processed to the specified size.

When the shape of the grindstone is broken from a perfect circle, or when the grindstone is clogged or spills along with the work of grinding the work, a truing or dressing work is performed. The truing operation and the dressing operation are performed by fixing the forming grindstone on the table, rotating only the grindstone without rotating the table, and reciprocating the saddle.

In recent years, when performing a truing operation or a dressing operation, a cup-shaped forming grindstone whose rotation axis is orthogonal to the upper surface of the table, a so-called truing grindstone (dressing grindstone) has become popular. By arranging two of these truing grindstones, rotating each truing grindstone by the driving force of the motor, and reciprocating in the direction orthogonal to the grindstone axis of the grindstone for workpiece grinding, the outer peripheral surface of the grindstone for grinding workpiece is An iris-shaped streak is formed. That is, by using this cup truer, the outer peripheral surface of the grindstone for grinding the work becomes sharp, and it is possible to improve the grinding accuracy and meet any demands for surface roughness, and to perform truing or dressing work efficiently. And it can be performed accurately.

[0006]

However, since the saddle of the rotary grinder reciprocates only in the axial direction of the grindstone shaft, the true direction of the truing grindstone with respect to the grindstone for grinding the workpiece is always the axis line of the grindstone shaft. It becomes the same direction as the direction. That is, it becomes impossible to use the truing grindstone.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotary grinder capable of performing truing work and dressing work of a grindstone by a truing grindstone. .

[0008]

In order to achieve the above object, according to the first aspect of the invention, a moving body that reciprocates in a linear direction with respect to a frame and a rotatably supported body are supported. In a rotary grinder that grinds a work on a table by a table on which the work is placed and a grindstone on a grindstone shaft arranged above the table, a truing grindstone that forms the outer circumference of the grindstone on the moving body. The gist of the present invention is to equip a truing device for positively rotating the truing wheel and reciprocating the truing grindstone in a direction orthogonal to the moving direction of the moving body.

The gist of the second invention is that the grindstone shaft is parallel to the upper surface of the table and parallel to the moving direction of the movable body. In the third invention,
The gist of the grindstone shaft is to incline with respect to the upper surface of the table.

The gist of the fourth invention is that the truing device is attachable to and detachable from a moving body.
A gist of the fifth invention is that the truing device is provided so as to be rotatable with respect to a moving body.

[0011]

According to the first to third inventions, the truing device causes the truing grindstone to reciprocate in the direction orthogonal to the moving direction of the moving body. As a result, the truing grindstone can reciprocate in the direction orthogonal to the grindstone axis. That is, since a truing grindstone can be used in the present invention, it is possible to perform truing or dressing work with higher efficiency and accuracy.

According to the fourth aspect of the present invention, the truing device can be attached to and detached from the moving body, so that the truing device can be detached if it interferes with the work grinding.
According to the fifth aspect, since the truing device rotates with respect to the moving body, the shape of the grindstone can be variously changed.

[0013]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a guide rail 3 (only one is shown) extending in the left-right direction is provided on the upper surface of the frame 1. A saddle 2 as a moving body is engaged with the guide rail 3, and the saddle 2 reciprocates left and right along the guide rail 3. A screw body 4 is provided on the lower surface of the saddle 2, and a screw shaft 5 is screwed on the screw body 4. One end of the screw shaft 5 projects to the outside of the frame 1 and is connected to the saddle moving motor 6 via a speed reducer (not shown). That is, the saddle 2 moves left and right with respect to the frame 1 based on the rotation of the saddle moving motor 6.

A table 7 is supported on the upper surface of the saddle 2 by a hydraulic motor (not shown) so as to be positively rotatable. The table 7 is an electromagnetic chuck and fixes the work W by an electromagnetic force. A column 10 is erected on the right side of the frame 1, and a screw shaft 12 extending vertically is disposed below the column 10. A screw body 13 is screwed to the lower end of the screw shaft 12, and the screw body 13 is used for the lifting motor 1.
It rotates with the driving of No. 4. On the other hand, a cylindrical slider 16 is connected to the upper end of the screw shaft 13 via a bearing 15. A grindstone shaft 17 is fixed to the slider 16.

A grindstone 21 for grinding the work W is rotatably supported at the front end of the grindstone shaft 17. The grindstone 21 is positively rotated by a motor 22 attached to the rear end of the grindstone shaft 17. The slider 16 and the grindstone shaft 17 move up and down as the lifting motor 14 rotates forward and backward. That is, the distance between the grindstone 21 and the table 7 changes as the lifting motor 14 rotates forward and backward.

As shown in FIGS. 2 to 4, a truing device 31 is fixed by bolts 32 to the upper surface of the saddle 2 on the column 10 side. The truing device 3
1 includes a case 33, a slide plate 34, truing grindstones 35 and 36, and the like.

The case 33 is formed in a box shape, and an opening 37 is formed on the upper surface thereof. A slide plate driving motor 38 is mounted on the upper surface of the case 33, and a rotation shaft 38 a thereof projects into the case 33. Rotating shaft 38
A rotary plate 39 is axially attached to a, and one end of a connecting rod 40 is rotatably attached to an eccentric position of the rotary plate 39. A slide plate 34 is slidably supported in the opening 37 of the case 33. The other end of the connecting rod 40 is rotatably attached to the lower surface of the slide plate 34. Therefore, when the slide plate drive motor 38 rotates, the slide plate 34 reciprocates in the opening 37 of the case 33 by the crank action of the rotary plate 39 and the connecting rod 40.

A pair of first and second truing grindstones 35 and 36 are rotatably supported on the slide plate 34 via bearings 41. The pulley 42 is attached to the rotary shaft 35a of the first truing grindstone 35,
Two 43 are axially attached. Second truing stone 3
A pulley 44 is attached to the rotary shaft 36a of 6 as a single body. Then, the pulley 42 of the first truing grindstone 35.
And the pulley 44 on the side of the second truing grindstone 36 are connected via a belt 45.

A truing wheel driving motor 46 is fixed to the upper surface of the slide plate 34. A rotary shaft 46a of the motor 46 projects into the slide plate 34, and a pulley 47 is attached to the rotary shaft 46a. And
The pulley 47 and the pulley 43 of the first truing grindstone 35 are connected via a belt 48.
Therefore, when the truing grindstone driving motor 46 rotates, the rotational movement is transmitted to the first and second truing grindstones 35 and 36 via the belts 48 and 45, and the truing grindstones 35 and 36 rotate at the same timing. .

Next, the operation of dressing the grindstone 21 by the truing apparatus 31 having the above-described structure will be described. First, the grindstone 2 is placed on the center line of the first and second truing grindstones 35 of the truing device 31.
The saddle moving motor 6 is driven so that the outer peripheral surface of the saddle 1 is positioned, and the position of the saddle 2 is adjusted. Then, the grinding wheel driving motor 22 is driven and the truing wheel driving motor 46 of the truing device 31 is driven. By driving the motors 38 and 46 of the truing device 31, the truing grindstones 35 and 36 rotate. In this state, the lifting motor 14 is driven to bring the grindstone 21 into contact with the truing grindstones 35 and 36, and then the slide plate driving motor 38 is driven to reciprocate the truing grindstones 35 and 36. As a result, the truing grindstones 35 and 36 are moved by the reciprocating motion of the grindstone 21.
The outer peripheral surface of the grindstone 21 is ground by alternately repeating the contact state in which the outer peripheral surface of the grindstone 21 comes into contact with the outer peripheral surface of the grindstone 21.

In this way, each truing grindstone 35, 3
6 repeats contact and separation with the grindstone 21 every time the slide plate 34 reciprocates. During this contact, the abrasive grains of the grinding stone 21 are crushed by a weak impact between the abrasive grains of the truing stones 35 and 36 and the abrasive grains of the grinding stone 21, and the shape correction of the grinding stone 21 is promoted. As a result, iris-shaped scratches are formed on the outer peripheral surface of the grindstone 21.

As described above, in this embodiment, the truing device 31 is mounted on the upper surface of the saddle 2 so that the truing grindstones 35 and 36 reciprocate in the direction orthogonal to the moving direction of the saddle 2. This makes the truing stone 3
It is possible to reciprocate 5, 36 in a direction orthogonal to the rotation axis of the grindstone 21. As a result, it becomes possible to form iris-shaped scratches on the outer peripheral surface of the grindstone, the grinding efficiency of the grindstone 21 can be further improved, and the outer circumference of the grindstone 21 can be formed with high accuracy.

(Second Embodiment) Next, a second embodiment of the present invention will be described. In this embodiment, the same members as those in the first embodiment will be described with the same member numbers.

As shown in FIG. 5, in this embodiment, the first
Unlike the embodiment, the grindstone shaft 17 is provided so as to be inclined with respect to the upper surface of the table 7. Further, as shown in FIGS. 5 and 6, a pair of protrusion pieces 41, 42 is formed on the base 2, and a truing device 31 is arranged between the protrusion pieces 41, 42. The truing device 31 is rotatably supported with respect to the base 2 about a shaft 43 supported by the protrusions 41 and 42. Truing device 3
1 is usually fixed on the base 2 by bolts 32 as in the first embodiment. In addition, the truing device 31
A bolt insertion hole 44 is formed through the side surface of the case 33.

When rotating the truing device 31 from the state shown in FIGS. 6 and 7, first, the bolt 32 is removed. By removing the bolt 32, the truing device 31 becomes rotatable with respect to the base 2. From this state, the truing device 31 is rotated counterclockwise to move the truing device 3
The back surface of the case 33 of No. 1 is substantially perpendicular to the top surface of the base 2. In this state, the bolt 45 is inserted into the bolt insertion hole 44 formed on the side surface of the truing device 31, and the bolt 45 is fastened to the base 2. As a result, the truing device 31 is fixed to the base 2 as shown in FIG.

Next, the operation of this embodiment will be described. When performing the surface grinding of the work W, the truing device 31
Is fixed to the position shown in FIG. 7, and the grindstone 2 is fixed in the same manner as in the first embodiment.
1 dressing is performed. As a result, as shown in FIG. 9, the outer periphery of the grindstone 21 is dressed.

When the work W having the cylindrical surface w1 shown in FIG. 11 is ground, the truing device 31 is fixed at the position shown in FIG. 9 and the grinding stone 21 is dressed, as in the case of surface grinding. Then, the bolt 32 is removed, and the truing device 31 is rotated to fix the truing device 31 at the position shown in FIG. In this state, the truing device 31 is driven to dress the grindstone 21. As a result, as shown in FIG. 12, a grinding surface 21a for a cylindrical surface and a grinding surface 21b for a flat surface are formed on the outer periphery of the grindstone 21.

After the dressing process of the grindstone 21 is completed, the fixed position of the truing device 31 is returned to the position shown in FIGS. 5 and 12 so that the truing device 31 does not get in the way when the work W is ground. When the work W is ground, the saddle moving motor 6 and the lifting motor 14 are driven to bring the cylindrical surface w1 of the work W into contact with the cylindrical grinding surface 21a of the grindstone 21. Grind. After that, the grindstone shaft 17 is lowered, and the ground grinding surface 2
1b is brought into contact with the flat surface w2 of the work W. Then, the saddle 2 is moved to the left and the grindstone 21 is moved in the outer peripheral direction of the work W. Thereby, the flat surface w2 of the work W is ground. The work W having the cylindrical surface w2 is ground as described above.

As described above, in this embodiment, since the truing device 31 is rotatably provided with respect to the base 2, the dressing of the grindstone 21 can be performed from below and from the side. As a result, when the grindstone shaft 17 is inclined with respect to the table 7, the workpiece W having the cylindrical surface w1 can be processed by changing the fixed position of the truing device 31 and dressing the grindstone 21. It will be possible.

The present invention is not limited to the above embodiments, but may be configured as follows, for example, within the scope of the invention. (1) In each of the above-described embodiments, the truing device 31 has the two first and second truing grindstones 35 and 36. However, the truing device 31 can be embodied as a single type truing device 31 having only one truing grindstone. Good.

(2) In each of the above embodiments, the truing device 31 is fixed on the saddle 2 with the bolts 32. However, the truing device 31 is integrally formed on the saddle 2, or the truing device 31 is detachably attached by a magnet or the like. It may be configured to do so.

(3) In each of the above embodiments, the reciprocating movement of the slide plate 34 supporting the truing grindstones 35 and 36 is configured to be performed by the crank mechanism. Good.

(4) In the second embodiment, the truing device 31 is manually rotated, but it may be rotated by using a motor, a cylinder or the like. (5) In the second embodiment, the fixed position of the truing device 31 can be switched between two positions, but the fixed position of the truing device 31 may be switched steplessly.

[0035]

As described in detail above, according to the present invention,
Since the truing device that reciprocates in the direction orthogonal to the moving direction of the moving body is provided on the moving body, the truing whetstone can be used for truing and dressing of the whetstone. As a result, there is an excellent effect that the outer circumference of the grinding wheel can be formed with higher accuracy and the grinding efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a rotary grinding machine according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of a rotary grinder showing a structure of a truing device.

FIG. 3 is a partial plan view of a rotary grinder showing a configuration of a truing device.

FIG. 4 is a side sectional view of the truing device.

FIG. 5 is a front view of a rotary grinding machine according to a second embodiment of the present invention.

FIG. 6 is a partial perspective view of a rotary grinder showing a structure of a truing apparatus according to a second embodiment.

FIG. 7 is a front view of the truing device in a normal fixed position.

FIG. 8 is a front view of the truing device that is rotated and fixed from the state of FIG.

FIG. 9 is a front view when the truing device is fixed to the position of FIG. 7 and the grindstone is dressed.

10 is a front view when the truing device is fixed to the position of FIG. 8 and the grindstone is dressed. FIG.

FIG. 11 is a perspective view of a work having a cylindrical surface.

FIG. 12 is a front view of a rotary grinder when grinding the work of FIG. 11.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame, 2 ... Saddle as a moving body, 7 ... Table, 17 ... Whetstone shaft, 31 ... Truing device, 33 ... Case which comprises a truing device, 35, 36 ... 1st and 2nd which comprises a truing device Truing whetstones 38, 46 ... Slide plate driving motor, truing whetstone driving motor, which constitutes a truing device, 39
... Rotating plate constituting truing device, 40 ... Connecting rods constituting truing device, 42, 43, 44 ... Pulleys constituting truing device, 45, 48 ... Belts constituting truing device

Claims (5)

[Claims] 1. A moving body (2) which reciprocates in a linear direction with respect to a frame (1) and a work (W) which is rotatably supported by the moving body (2) and is mounted thereon. A table (7) and a grindstone shaft (1) arranged above the table (7) for grinding a work (W) on the table (7).
7) In the rotary grinder provided with the upper grindstone (21), the truing grindstone (35, 36) for shaping the outer periphery of the grindstone (21) is positively rotated on the moving body (2), and A rotary grinder equipped with a truing device (31) for reciprocating a truing grindstone (35, 36) in a direction orthogonal to a moving direction of a moving body (2). 2. The grindstone shaft (17) is parallel to the upper surface of the table (7) and is parallel to the moving direction of the moving body (2). Rotary grinder. 3. The rotary grinder according to claim 1, wherein the grindstone shaft (17) is inclined with respect to the upper surface of the table (7). 4. The rotary grinding machine according to claim 1, wherein the truing device (31) is attachable to and detachable from the moving body (2). 5. The rotary grinding machine according to claim 1, wherein the truing device (31) is provided so as to be rotatable with respect to the moving body (2).