JPH09150356A - Grinding wheel head for double head plane grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower a replacement cost accompanying abrasion of a spline by connecting a grinding wheel shaft, in which a grinding wheel is fixed in the end part, to a spline shaft, which is provided with the spline, removably in a spindle rotating the grinding wheel. SOLUTION: A spindle 33 is constructed of a grinding wheel shaft 31 and a spline shaft 32, which are connected together removably, and in the grinding wheel shaft 31, a grinding wheel receiving plate 30 in which a grinding wheel 1 is fixed in the lower end part is integrally formed, while in the spline shaft 32, a spline part 32a to be spline fitted to a rotary cylinder 8 is formed. The grinding wheel shaft 31 and the spline shaft 21 are integrally connected to each other, when a faucet joint projected in the lower end face center of the spline shaft 32 is centered and fitted to a recess part bored in the upper end face center of the grinding wheel shaft 31, a pin is fitted straddlingly into a pin hole 36 bored in the upper end face of the grinding wheel shaft 31 and into a pin hole bored in the lower end face of the spline shaft 32 opposedly to the pin hole 36, and several parts of the circumference in a flange part integrally formed in the lower end of the spline shaft 32 are fixed on the upper end face of the grinding wheel shaft 31 by means of a bolt 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone head for a double-sided surface grinder that grinds both sides of a workpiece at high speed.

[0002]

2. Description of the Related Art The applicant of the present invention has previously filed Japanese Patent Application No. 57-6445.
Japanese Patent Publication No. Sho 60-8179 proposes a double-sided surface grinder having an upper grindstone head.

FIG. 4 is a vertical sectional view showing the upper grindstone head of the double-sided surface grinder.

In FIG. 4, (1) is a grindstone, which is integrated with the lower end of a spindle (4) rotatably supported in a quill (3) provided vertically movable with respect to a frame (2). It is fixed to the whetstone receiving plate (5) formed on the. (6) is an inner sleeve that supports the quill (3) so as to be vertically movable, and has a cap (7) fixed to the upper end. Reference numeral (8) is a rotary cylinder rotatably supported by the cap (7), which is spline-fitted to the spline portion (4a) at the upper end of the spindle (4) and integrally fixed to the driven pulley (9). ing. The driven pulley (9) is connected to a drive motor (not shown) integrally fixed to the frame (2) via a belt, a drive pulley, and the like (not shown), and the drive motor drives the drive pulley, the belt, and the drive pulley. When the rotary cylinder (8) is rotated via the driven pulley (9) and the like, the spindle (4) in which the rotary cylinder (8) is spline-fitted to the spline portion (4a) rotates, and the grindstone ( 1) can be rotated.

Reference numeral (10) is a worm wheel screwed into a screw portion (11) formed on the outer peripheral surface of the middle portion of the quill (3) so that the inner sleeve (6) cannot move vertically. It is rotatably supported. Reference numeral (12) is a worm gear that is constantly meshed with the worm wheel (10). The worm gear is rotatably supported by the frame (1) by an appropriate means and is connected to a drive device (not shown). When rotated, it rotates a worm wheel (10) that always meshes, and this worm wheel (10)
And the screw portion (11) of the quill (3) are screwed together to move the quill (3) up and down with respect to the inner sleeve (6), and the spindle (3) supported by the quill (3) accordingly. The grindstone (1) can be moved in the vertical direction via 4).

Reference numeral (13) is an outer sleeve in which an inner sleeve (6) is integrally fitted and held, and is supported by the frame (2) by a swivel structure so as to freely rotate. That is, the movable body having a spherical sliding lower surface fixed to a flange portion (14) projecting from the outer periphery of the upper portion of the outer sleeve (13) and having a spherical center at a point (O) of the axis of the spindle (4). The ring (15) is fixed to a shoulder (16) formed in the upper part of the frame (2) and has a spherical sliding upper surface with a point (O) of the axis of the spindle (4) as the spherical center. Place the outer sleeve (1) on the stationary ring (17).
3) Supports the upper part of the outer sleeve (1
The lower end flange portion (18) of the inner sleeve (6) having a spherical outer peripheral surface having the spherical surface centered on the above point (O) while holding the lower portion of 3) is fixed to the lower end of the frame (2). The lower part of the outer sleeve (13) is supported by the frame (2) by being fitted into the cylinder (19), and usually a plurality of clamp mechanisms (circumferentially arranged on the upper end of the frame (2) ( It is fixed to the frame (2) by 20). The clamp mechanism (20) has a clamper (22) attached to the upper end of the frame (2) via a washer (23) capable of aligning the clamp bolt (21), and the clamp bolt (21) is tightened. This allows the clamper (22) to press and hold the collar portion (14) of the outer sleeve (13) to fix the outer sleeve (13) to the frame (2).

Reference numeral (24) is an adjusting mechanism for adjusting the inclination of the axis of the grindstone (1). A plurality of adjusting bolts (25) are arranged on the outer peripheral surface of the outer sleeve (13) in a circumferentially equidistant manner. The adjustment of the inclination of the axis of the grindstone (1) is performed by tightening or loosening each adjusting bolt (25) arbitrarily. That is, after loosening the clamp bolts (21) of the clamp mechanism (20) to release the fixing of the outer sleeve (13), one or more adjusting bolts (2) are provided.
While tightening 4) to form a gap between the head and the inner peripheral surface of the frame (2), loosen the remaining adjustment bolt (25) so that the gap disappears at the head. When the inner peripheral surface of (2) is pressed, the outer sleeve (13) pivots about one point (O) of the axis of the spindle (4) as a fulcrum, and accordingly, the inner sleeve (6) and quill (3). And the spindle (4) also turns to grindstone (1)
The axis of can be tilted. By this operation, the inclination of the axis of the grindstone (1) is adjusted, and when a predetermined inclination is obtained, the adjusting bolt (25) is fixed by the lock nut (26), and the clamp bolt (21) of the clamp mechanism (20) is fixed. Tighten to fix the outer sleeve (13) to the frame (2) and complete the adjustment.

A piston (27) is mounted and fixed to the upper end of the quill (3), and is a cylinder chamber (29) formed by the inner circumference of the upper portion of the inner sleeve (6), the cap (7) and the cover (28). The cylinder chamber (2
The quill (3) is pulled upward by being constantly pressed upward by the compressed air or pressure oil acting on 9), and the grindstone (1) is passed through the spindle (4) supported by the quill (3) accordingly. ) Is pulled upward, and the one side slope of the screw thread of the screw part (11) engraved on the outer peripheral surface of the middle part of the quill (3) is replaced with the above one side slope surface of the screw thread of the worm wheel (10). It is possible to solve the deterioration of processing accuracy due to backlash in the screw fitting portion by constantly pressing the one inclined surface facing each other.

[0009]

By the way, according to the grindstone head of the double-sided surface grinder, the quill (3) moves vertically with respect to the frame (2). 4) Spline part (4a)
Is transmitted to the grindstone (1). As a result, the rotational power of the drive motor is applied to the spline portion (4a) of the spindle (4) while the machine is operating, and the spline portion of the spindle (4) rubs against the rotary cylinder (8). There is a problem that (4a) is worn and vibration, abnormal noise, etc. are generated thereby, which adversely affects the processing accuracy. Therefore, it is necessary to regularly replace the spindle (4), but with the conventional structure, even if only the spline portion (4a) is worn, the spindle (4)
Since the whole must be replaced, the replacement cost is very high, and the entire grindstone head must be disassembled to replace the spindle (4), which requires a great deal of labor and time. It was

The present invention has been proposed in view of the above problems, and it is an object of the present invention to provide a grindstone head for a double-sided surface grinder, in which the replacement cost due to wear of the spline is kept low and the replacement work is simple. And

[0011]

In order to achieve the above object, the present invention is characterized by adopting the following configuration.

That is, according to the present invention, a grindstone is fixed to one end, and the other end is connected to a rotation driving means through spline fitting to rotate the grindstone, and a spindle is attached to the end of the grindstone shaft. , And a spline shaft having a spline are detachably connected.

With such a structure, even if the spline is worn, the initial machining accuracy can be maintained by replacing only the spline shaft, and the grindstone shaft can be used semipermanently. Is.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. However, the same parts as those explained in the conventional apparatus shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is a vertical sectional view showing a grindstone head of a double-sided surface grinder of the present invention. The feature of the present invention is that a grindstone integrally formed with a grindstone receiving plate (30) for fixing the grindstone (1) to a lower end portion thereof. The spindle (33) is configured by detachably connecting the shaft (31) and the spline shaft (32) formed with the spline portion (32a) for spline fitting with the rotary cylinder (8).

The grindstone shaft (31) and the spline shaft (32) are
As shown in FIGS. 2 and 3, a recess (34) formed at the center of the upper end surface of the grindstone shaft (31) is fitted with an inlay (35) projecting at the center of the lower end surface of the spline shaft (32). In addition, a pin (38) is formed in the pin hole (36) formed in the upper end surface of the grindstone shaft (31) and in the pin hole (37) formed in the lower end surface of the spline shaft (32) in opposition thereto. Mating over and mating,
The flange portion (39) integrally formed at the lower end of the spline shaft (32) is fixed to the upper end surface of the grindstone shaft (31) at several circumferential positions by bolts (40) to be integrally connected.

The grindstone head of the double-sided surface grinder of the present invention is
A whetstone shaft (31) integrally formed with a whetstone receiving plate (30) for fixing the whetstone (1) to a lower end portion thereof, and a spline shaft (3) having a spline portion (32a) for spline fitting a rotary cylinder (8).
2) is integrally connected to form the spindle (33), so even if the spline part (32a) of the spline shaft (32) of the spindle (33) is worn, only the spline shaft (32) needs to be replaced. The initial processing accuracy can be maintained with
The grindstone shaft (31) can be used semipermanently.
Therefore, the replacement cost due to the wear of the spline can be kept low, and the replacement work can be performed without disassembling the entire grindstone head. As a result, it is easy to regularly replace the spline, the initial processing accuracy can always be maintained, and the processing accuracy can be stabilized.

Although the above embodiment describes the upper grindstone head capable of tilting the axis of the grindstone (1), the present invention is also applied to the upper grindstone head and the lower grindstone head in which the axis of the grindstone (1) cannot tilt. be able to.

[0019]

As described above, according to the present invention,
The split structure of the spindle and the spindle makes it possible to keep the cost of replacement due to wear of the spline low and to easily replace the grindstone head without disassembling the entire grindstone head. Can be performed regularly, and the initial processing accuracy can always be maintained and the processing accuracy can be stabilized.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a grindstone head of a double-sided surface grinder of the present invention.

FIG. 2 is a partial cross-sectional front view showing a main part of a spindle used in the present invention.

FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 4 is a vertical cross-sectional view showing a grindstone head of a conventional double-sided surface grinder.

[Explanation of symbols]

 31 Grindstone shaft 32 Spline shaft 32a Spline part 33 Spindle

Claims (2)

[Claims] 1. A spindle in which a grindstone shaft for fixing a grindstone to an end thereof and a spline shaft having a spline are detachably connected to each other, and a spline shaft is connected to a rotation driving means through spline fitting, and the spindle. An inner sleeve rotatably supported immovably in the axial direction and provided with a screw portion on a part of the outer circumference, and an inner sleeve movably supported in the axial direction and screwed into the screw portion of the inner sleeve. It consists of an outer sleeve that supports the worm wheel so that it can rotate and does not move in the axial direction, and a grindstone cutting mechanism that includes a worm that constantly meshes with the worm wheel of the outer sleeve. It is driven to rotate, and the grinding wheel cutting mechanism allows it to pass through the worm, worm wheel, inner sleeve and spindle. A grindstone head for a double-sided surface grinder, characterized in that the grindstone is moved in the axial direction to make a cut. 2. A spindle in which a grindstone shaft for fixing a grindstone to an end thereof and a spline shaft having a spline are detachably connected to each other, and the spline shaft is connected to a rotation driving means through spline fitting, and the spindle. An inner sleeve that is rotatably supported immovably in the axial direction and has a screw portion on a part of the outer periphery, and an inner sleeve that is movably supported in the axial direction and is screwed into the screw portion of the inner sleeve. A grindstone having an outer sleeve that rotatably supports the worm wheel immovably in the axial direction, and is rotatably supported by a frame with a swivel structure, and a worm that constantly meshes with the worm wheel of the outer sleeve. It consists of a notch mechanism, the grindstone is driven to rotate through the spindle by the rotation drive means, and by the grindstone notch mechanism. A double-sided surface grinder characterized by moving the grindstone in the axial direction through the worm, worm wheel, inner sleeve and spindle to give a cut and turning the outer sleeve with respect to the frame to tilt the grindstone. Whetstone head.