JPH04193472A - Grinding machine grinding wheel position automatic correction device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic grindstone position correction device for a grinding machine that automatically adjusts the outer periphery of a grindstone whose diameter has been reduced by dressing to always be in the same position.

[Prior Art] A grindstone needs to be dressed relatively frequently. Dressing is performed by automatically or manually operating a dressing table attached to the grindstone main body and dressing the outer periphery of the grindstone by a predetermined amount, and the outer diameter of the grindstone is reduced by the dressed amount. Therefore, in order to perform grinding by applying the outer periphery of the grindstone to a workpiece in a fixed position, it is necessary to move the grindstone head main body forward toward the workpiece by the predetermined dressing amount. In conventional grinding machines, a back-and-forth movement device for the tracing table and a back-and-forth movement device for the grinding wheel head body are separately provided and operated independently without any connection. After the dress
Adjustment work was required to bring the outer diameter of the grindstone into proper contact with the workpiece.

[Problems to be Solved by the Invention] The adjustment work of bringing the grindstone into contact with the workpiece after dressing requires skill, requires a lot of work time, and has the problem of reducing the machine operating rate6. However, there has been a problem in that errors are likely to occur due to backlash of the gear group used in the forward/reverse movement device, etc., and highly accurate positioning is difficult.

The present invention solves the above-mentioned problems.At the same time as the grinding wheel is being dressed, the grinding wheel advances toward the workpiece by the dressing amount, eliminating the need for positioning the grinding wheel alone, and allowing To provide an automatic grinding wheel position correction device for a grinding machine, which allows only the grinding wheel to move forward and backward independently, and allows the position of the grinding wheel to be adjusted in response to changes in workpiece size.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a workpiece that is supported on the immovable side of the machine so as to be able to reciprocate in a direction (referred to as the X direction) toward or away from the outer periphery of the workpiece. A right-handed threaded portion and a left-handed threaded portion are arranged along the X direction and have at least the same pitch dimension on the axis of the grinding wheel head main body, and one end thereof is rotatably connected to the grinding wheel head main body; A feed screw shaft formed by screwing the right-hand threaded part or left-hand thread part formed on the other end side to the stationary side of the machine, and a left-hand thread part or right-hand thread part formed in the middle part of the feed screw shaft. A dressing table actuating arm member having one end screwed together and the other end connected to a dresser table movably supported by the grindstone main body in the X direction; and a feeder for rotating the feed screw shaft. The present invention constitutes an automatic grindstone position correction device for a grinding machine, which is provided with a screw shaft drive means.

[Function] When the feed screw drive means is operated and the feed screw shaft is rotated to the left, the dressing stand actuating arm screwed into the right threaded portion of the feed screw shaft advances toward the grindstone, and the grindstone is dressed. On the other hand, as the feed screw shaft rotates, the left-hand thread at the other end fits into the stationary side of the machine.One end of the feed screw shaft is connected to the grinding wheel head body, so
The grindstone head body advances toward the workpiece. Since the right-hand threaded portion and the left-hand threaded portion are formed to have the same pitch dimension, the grindstone main body moves toward the workpiece by the dressing amount. Furthermore, since the dressing table is held by the grindstone head main body, it moves forward by the same amount as the grindstone head main body moves forward. That is, even when the grindstone is dressed, the grindstone always comes into abutting engagement with the workpiece, and the dresser also always maintains the same position relative to the outer periphery of the grindstone.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 and 2 show the overall structure of an automatic grindstone position correction device 1 according to this embodiment.

The grindstone head main body 2 has a base stand 3 supported movably along the X-X direction (hereinafter referred to as the X direction) shown on the immovable side of the machine, and a base stand 3 that is rotatable by a certain angle on the base stand 3. It is composed of a supported rotating frame 4 and the like. The rotation frame 4 is a worm 5. which is rotated by a drive means of a circuit. It is formed so that it can rotate by an amount equivalent to the torsion angle of the workpiece 7 via the worm wheel 6, rotation shaft 7, etc. (detailed explanation of the structure will be omitted). A grindstone 8 is pivotally supported on the rotating frame 4. Further, the dressing stand 10 supporting the dresser 9 is a grindstone stand main body 2.
It is mounted on a base 3 and is supported so as to be able to reciprocate along the X direction. Motor 11 mounted on dressing table 10
The circuit is used to drive a dresser such as a swivel dresser (circuit). Further, the motor 12 supported by the one-turn frame 4 is interlocked with the support shaft of the grindstone 8 and drives the grindstone 8 to rotate. Further, the other end side of the dressing table operating arm member 13 is connected to the dressing table 10.

The feed screw shaft 14 is arranged along the X direction.

A spline 15, a right-handed threaded portion 16. A left-hand threaded portion 17 having the same pitch p as the right-hand threaded portion 16 is formed.

One end of the feed screw shaft 14 is connected to the base 3 of the grindstone main body 2. Although the detailed structure of the connecting portion is not clearly shown in the drawings, the base 3 is connected in a structure that rotatably supports the feed screw shaft 14 and restrains its movement in the axial direction. In order to prevent shock in the axial direction of the feed screw shaft 14, a spring 18 is interposed between one end thereof and the base 3. On the other hand, a left-handed threaded portion formed on the other end side of the feed screw shaft 14 is screwed into a threaded bush 19 .

The threaded bush 19 is rotatably supported on the stationary side 20 of the machine with its axial movement restrained. A six screw bush 19 is connected to the screw bush 19 and a gear 21 is connected thereto.
The rotation driving means 22 for rotationally driving the 1 machine includes a rotating shaft 23 supported on the immovable side of the machine, a handle 24 for rotating the shaft, a gear 25 connected to the rotating shaft 23, and the gear connected to the threaded bush 19. It is composed of 21st magnitude.

As described above, the dressing table operating arm 13 has its other end connected to the dressing table 10, and its tip side connected to the feed screw shaft 1.
4, which is screwed into the right-hand threaded portion 16 of No. 4.

The feed screw shaft driving means 26 is as shown in FIG.

It is composed of a drive shaft 27 that is pivotally supported on the stationary side 20 of the machine, a handle wheel 28 that is fixed to one end of the drive shaft 27, and a worm wheel 29 that is fixed to the other end of the drive shaft 27 and meshes with the spline 15.

A brake piece 31 is supported in a plurality of guide holes 30 formed along the circumference of the handle wheel 28 so as to be slidable along the axial direction of the drive shaft 27, and the brake piece 31 is immovably supported. A spring 32 that presses against the side 20 is housed. The brake piece 31 is used to brake and hold the handle wheel 28 in a predetermined position.

Next, the function and operation of this embodiment will be explained.

By rotating the handle wheel 28 of the feed screw shaft driving means 26 by a predetermined amount, the drive shaft 27 and the worm wheel 29 are rotated, and the spline 15 meshing with the worm wheel 29 is rotated by a predetermined amount. In this embodiment, it is assumed that the spline 15 is rotated to the left.

When the feed screw shaft 14 rotates to the left due to the left rotation of the spline 15, the right-handed threaded portion formed at the intermediate portion of the feed screw shaft 14 rotates to the left, thereby moving the dressing table operating arm member 13 to the left in the figure. Thereby, the grindstone head is dressed by the dresser 9. Simultaneously with the above operation, the left-hand threaded portion 27 formed on the other end side of the feed screw shaft 14 is fitted into the threaded bushing 19, so that the feed screw shaft 14 moves forward in the left direction in the figure. One end side of the feed screw shaft 14 is connected to the grindstone main body 2
Since it is connected to the base 3 of the grinding wheel head, the entire grinding wheel head main body 2 moves to the left in the figure. Since the dressing table 10 is also supported by the whetstone head body 2, the dressing table 10 also moves by the same amount as the whetstone head body 2.

The above operation will be explained more clearly with reference to FIG.

It is assumed that the tip of the dresser 9 is initially in contact with the outer periphery of the grindstone 8. Further, the workpiece 7 is supported immovably in the X direction on the immovable side 20 of the machine, and its center point 0□ is held immovable.

As described above, the rotation of the feed screw shaft 14 causes the dresser 9 to dress the outer diameter of the grindstone 8 by the dimension a. When the grindstone remains as it is, a gap of dimension a is created between the workpiece 7 and the grindstone 8. However, the feed screw shaft 14
Since the right-hand threaded portion 16 and the left-hand threaded portion 17 are formed with the same pitch P, the grindstone 8 also moves toward the workpiece 8 by the dimension a, as described above. As a result, as shown in the lower diagram of FIG. 3, the dresser 9 moves forward by 28 from the position shown in the upper diagram, and the grindstone 8 moves forward by a distance a. That is, before and after dressing, the grindstone 8 comes into contact with the workpiece 7, and the dresser 9 is maintained in the initial state in which it is in contact with the grindstone 8. Thereafter, even if dressing is continued, the same state as described above will be maintained.

Next, the action of moving only the grindstone 8 will be explained.

By rotating the rotating shaft 23 of the rotation drive means 22 with the handle 24, the gear 21 is rotated via the gear 25. Since the screw bush 19 is fixed to the gear 21, the screw bush 19 is rotated. Since the threaded bushing 19 is restricted from moving along its axial direction by the immovable side 20, the rotation of the threaded bushing 19 causes the feed screw shaft 14 to move in the axial direction (X direction). Since the feed screw shaft 14 is connected to the base 3 of the grinding wheel head main body 2 as described above, the entire grinding wheel head main body 2 moves in the X direction. As described above, the feed screw shaft 14 moves in the X direction but does not rotate, so the dressing operating arm member 13 moves together with the feed screw shaft 14. As a result, the position of the grindstone 8 relative to the workpiece 7 changes without changing the state of engagement between the dresser 9 and the grindstone 8 at all. The above is applied when the grindstone 8 is replaced or the outer diameter of the workpiece 7 is changed.

In this embodiment, the right-hand threaded portion 16 and the left-hand threaded portion 17 formed on the feed screw shaft 14 are formed in the relative positions as shown in the figure, but of course, their positions may be interchanged.

[Effect of the invention] According to the present invention, the following effects can be achieved.

1) Since the grinding wheel is configured to move in conjunction with the same amount of dressing as the dressing amount by the dresser, and the dresser is configured to move by the same amount at the same time as the main body of the grinding wheel supporting the grinding wheel, the grinding wheel is not dressed. However, the relative positions between the grindstone and the workpiece and between the grindstone and the dresser do not change. In addition, unlike the prior art, there is no need to adjust the engagement position between the grindstone and the workpiece during dressing. With the above, work efficiency can be improved.

2) Because the position of the grindstone is adjusted automatically.

Highly accurate positioning correction is performed.

3) Since the grindstone is formed so that only the grindstone can be moved independently even if the dimensions of the workpiece and the grindstone change, it can be handled in a short time and with high precision.

4) Unlike the prior art, there is no need to use separate devices to move the dresser and the grindstone, and the movement is performed by a single movement means, so the entire device can be made compact.

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view showing the overall structure of an embodiment of the present invention;
FIG. 2 is an axial sectional view showing the general structure of the feed screw shaft driving means, and FIG. 3 is an explanatory view for explaining the operation of this embodiment. 1... Grinding wheel position automatic correction device, 2... Grinding wheel head body,
3... Base stand, 4... Rotating frame body, 5... Worm, 6, 29... Worm wheel, 7, 23...
Rotating shaft, 8... Grindstone, 9... Dresser, 10...
Dressing stand, 11... motor, 12... grindstone motor,
13... Dressing table operating arm member, 14... Feed screw shaft, 15... Spline, 16... Right threaded portion. 17...Left-hand thread part, 18.32...Spring, 1
9...Screw bush, 20...Imovable side, 21.25
... Gear, 22 ... Rotation drive means, 24 ... Handle, 26 ... Feed screw shaft drive means, 27 ... Drive shaft, 28 ... Handle wheel, 30 ... Guide hole,
31...Brake piece.

Claims (2)

[Claims] (1) A grindstone main body supported on the immovable side of the machine so as to be able to reciprocate in a direction approaching or away from the outer circumference of the workpiece (referred to as the A right-handed threaded portion and a left-handed threaded portion having the same dimensions are formed, one end of which is rotatably connected to the grindstone main body, and the right-handed threaded portion or left-handed threaded portion formed at the other end is connected to an immovable part of the machine. A feed screw shaft is screwed to the side, and one end is screwed to a left-handed or right-handed threaded portion formed in the middle of the feed screw shaft, and the other end is attached to the grindstone body in the X direction. a dressing table operating arm member connected to a dresser table movably supported along the (2) The threaded bush of the right-hand threaded part or left-hand threaded part on one end side of the feed screw shaft is rotatable to the immovable side of the machine;
The threaded bushing is mounted so as to be restrained from moving in the axial direction, and is provided with rotational drive means for rotating the threaded bushing.
The automatic grinding wheel position correction device for a grinding machine described in 1).