JPH05285811A - Work rest of centerless grinder - Google Patents

Abstract

PURPOSE:To eliminate complicated exchange work of blades at the time of changing steps and to simplify position adjustment of the blades by providing the blades on a work rest of a centerless grinder a slide surface free to move and fix in the vertical direction. CONSTITUTION:A slide table 5 is provided on a bed 1 on which a grinding wheel frame where a grinding wheel 3 is installed free to adjust its position in the right and left direction and to fix, and a work rest 7 is fixed on the edge part upper surface on the side of the grinding wheel 3 through a floorplate 6. This work rest 7 is constituted of a rest base 21 fixed with a bolt on the floorplate 6 and a holder 22 free to adjust its position in the vertical direction and to fix on a slide surface 26 of this rest base 21, and it is fixed with a bolt by installing a blade 23 on an L type slitting 27 formed on the upper edge of this holder 22. Thereafter, the holder 22 is vertically moved through a rack 34 by rotating a pinion shaft 36 projected on the side surface of the work rest 7, and thereby it is possible to adjust height of the blade 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work rest of a centerless grinding machine, and more particularly to a blade mounting structure for supporting a work from below between a grinding wheel and an adjusting wheel.

[0002]

2. Description of the Related Art As shown in FIG. 4, a work 12 of a centerless grinder is supported on its outer periphery by a grinding wheel 3, an adjusting wheel 15, and a blade 23 of a work rest. Is set at a position where the shaft center of the work 12 is higher than the shaft centers of the grinding wheel 3 and the adjusting wheel 15 by a center height h. This core height h is slightly different depending on whether the work 12 is a solid shaft or a hollow shaft, but the normal work 12
The angle θ formed by the line B connecting the shaft center of the work and the shaft center of the adjusting wheel 15 with respect to the line A connecting the shaft center of the above and the center of the grinding wheel is selected to be about 7 degrees. Also, the receiving surface 25 of the blade 23
Is inclined so that the adjustment vehicle 15 side is low,
The inclination angle is often set to about 30 degrees with respect to the horizontal plane.

Further, as shown in FIG. 5, when the contact line 41 between the blade receiving surface 25 and the work 12 is biased to the vicinity of the tip of the blade 23, the supporting rigidity of the blade 23 decreases, and the contact line 41 moves toward the adjusting wheel 15 side. When biased, the work 12
As the amount of grinding liquid and sludge entrained in the receiving surface 25 increases with the rotation of the blade, the blade is normally moved from the tip 42 of the blade to a position about 1/3 to 1/4 of the width W of the receiving surface as shown in FIG. Is set.

In the machining of such a centerless grinding machine, when the diameter of the workpiece 12 changes, the distance between the grinding wheel 3 and the adjusting wheel 15 and the height of the blade 23 are changed as shown by an imaginary line in FIG. It must be reset to fit the 12 diameter. The following two structures have been proposed as typical structures that enable this setting.

In the first structure shown in FIG. 6, a guide hole 51 is provided in the vertical direction in the center of the bed 1 of the centerless grinding machine, and a column 52 is vertically slidably inserted through the work rest 7 at the upper end thereof. And the grinding wheel 3 and the adjusting wheel 15 are mounted on the bed 1 via slide bases 53 and 5 which are slidable and positionable in the left-right direction in the drawing. The movement of the column 52 and the slides 53, 5 with respect to the bed 1 is performed by using a rack and pinion mechanism and a feed screw mechanism. Since this structure can move the work rest 7 up and down with a considerably large stroke, it is possible to cope with a certain change in the diameter of the work 12. Of course, the distance between the grinding wheel 3 and the adjusting wheel 15 changes depending on the diameter of the work 12, and when machining a small-diameter work, a work rest that fits within a narrow space is required, and when a large-diameter work is ground. Since a work rest with high rigidity is required, not all work can be processed with one work rest 7.

Another method, as shown in FIG. 7, is to mount a grinding wheel 3 on a fixed position on a bed 1 and to provide a slide base 5 on the bed 1 which can move and position in the left-right direction in the figure. Then, the work rest 7 is attached to the end portion of the grinding wheel 3 side, and the adjusting wheel frame 14 that can be positioned and moved on the slide base 5 in the left-right direction in the figure is provided. It is a structure that supports. In the case of this structure, when the diameter of the work 12 changes, the height of the blade 23 of the work rest and the horizontal position of the figure and the horizontal position of the adjusting wheel 15 on the slide table 5 are adjusted.

In the structure of FIG. 7, the slide base 5 is inserted between the bed 1 and the blade 23,
Since this slide base transmits the vertical force of the blade 23 to the bed 1, the rigidity (thickness) cannot be reduced so much. Therefore, it becomes difficult to secure a space for moving the blade 23 up and down, and a change in the diameter of the work 12 is handled by preparing a number of blades having different heights and exchanging them.
For fine adjustment of the blade height, a structure in which a height adjusting plate 29 is inserted between the blade 23 and its holder 22 is adopted.

[0008]

As described above, as shown in FIG.
Although the blade height can be adjusted relatively easily with this structure, since the guide hole 51 is provided in the center of the bed 1, the rigidity of the bed 1 is ensured and the hole processing of a large bed is performed with high accuracy. There is a problem that the device becomes very expensive because it is necessary to perform. On the other hand, the structure shown in FIG. 7 has a drawback that the height adjustment range of the blade 23 is very narrow, so that it is necessary to prepare many kinds of blades and that the setup work when the diameter of the work changes is troublesome. is there.

Further, in the conventional structure shown in FIGS. 6 and 7, the contact position between the inclined receiving surface 25 of the blade and the peripheral surface of the work 12 is such that the blade 23 moves relative to the vertical and horizontal directions. Since the structure is adjusted by, the position of the contact line 41 (see FIG. 5) between the blade 23 and the work 12 changes simply by changing the blade height. There is also the problem that the adjustment work during setup is complicated and difficult to understand, because it must be done by adjusting the height and adjusting the horizontal direction.

An object of the present invention is to improve the drawbacks of the conventional structure as described above, and it is possible to move the blade 23 up and down with a certain stroke without impairing the supporting rigidity of the bed and the work rest, and therefore, An object of the present invention is to obtain a structure that does not require frequent blade replacement work at the time of setup change and can more easily and intuitively adjust the position of the blade at the time of setup change.

[0011]

According to the present invention, the blade 23 of the work rest 7 supporting the lower outer periphery of the work 12 between the grinding wheel 3 and the adjusting wheel 15 is attached to the work receiving surface 2 thereof.
The above problem is solved by mounting the blade 23 through the slide surface 26 in the direction orthogonal to the direction No. 5 and allowing the blade 23 to move and be fixed in the vertical direction along the slide surface 26.

The work rest 7 having the above-mentioned structure may be mounted on a fixed position of the bed 1 so as to move the grinding wheel 3 and the adjusting wheel 15 in the left-right direction according to the diameter of the work 12 (double cut). Alternatively, as shown in FIG. 7, a work rest may be mounted on the slide base 5 and the grinding wheel 3 may be provided at a fixed position on the bed 1 (single cut).

[0013]

In the above structure, since the slide surface 26 for moving the blade 23 up and down is an inclined surface inclined downward toward the grinding wheel 3 side, even when the work rest 7 is mounted on the slide base 5, The space required for the downward movement of the blade 23 is provided between the grinding wheel side end of the slide table 5 and the peripheral surface of the grinding wheel 3 without sacrificing the rigidity (thickness) of the slide table 5 immediately below the blade 23. This can be taken in the space between them, and a certain amount of vertical adjustment stroke of the blade 23 is possible.

Further, along the slide surface 26, the blade 2
When the blade 3 is moved up and down, the blade 23 moves in a direction orthogonal to the receiving surface 25, and the moving direction is the radial direction of the work 12 contacting the receiving surface 25. Therefore, when the diameter of the work changes, if it is not necessary to change the center height h, the blade 23 is moved by the slide surface 26 by the radius difference of the work 12, and the slide base 5 (or the grinding wheel 3) is moved. Of the adjustment wheel 15 on the slide table 5 (or on the bed 1).
Is moved by the radius difference of the work 12, the core height h of the work and the position of the contact line 41 on the blade receiving surface 25 are secured, so that the position adjustment work of the blade 23 at the time of setup change is very easy. become. Slide surface 2
Holder 2 which is provided so as to be vertically movable and fixed along 6
According to the structure of the illustrated embodiment in which the blade 23 is mounted on the blade 2 in such a manner that the position of the blade 23 can be adjusted in the vertical direction, the height adjustment plate 29 between the holder 22 and the bottom surface of the blade 23 can be inserted. The position of the contact line 41 on the receiving surface 26 of the blade does not change even at this time, so that the setup work including the work of adjusting the core height h of the work can be easily performed.

[0015]

1 to 3 show an embodiment in which the work rest of the present invention is provided on a single-cut type centerless grinding machine. In FIG. 3 showing the entire structure of the centerless grinding machine,
A grinding wheel frame 2 is fixed on the bed 1, and a grinding wheel 3 is attached to the grinding wheel frame 2 by a grinding motor 4 via a belt transmission device (not shown) provided behind the plane of the drawing. It is driven to rotate.

A slide base 5 is provided on the bed 1 so as to be positionally adjustable and fixed in the left-right direction in the figure, and a work rest 7 is fixed to the upper surface of the end portion of the grinding wheel side through a floor plate 6. The floor plate 6 has a function of dispersing the load of the work rest 7 in the width direction of the slide table 5 (the direction perpendicular to the paper surface of the drawing), and is functionally a part of the slide table 5.

A slide frame 11 is provided on the slide base 5 so as to be movable in the left-right direction and fixed in the figure.
An adjusting wheel frame 14 is mounted on the slide frame 11 so as to be rotatable and fixed around a turning pin facing the center of the workpiece 12 to be ground, and an adjusting wheel 15 is pivotally supported on the adjusting wheel frame 14. The adjusting wheel 15 is rotationally driven by a motor mounted on the adjusting wheel frame 14. The dressing device 16 for dressing the grinding wheel 3 is provided on the anti-adjustment wheel side of the grinding wheel frame 2, and the dressing device 17 for dressing the adjustment wheel 15 is provided on the adjustment wheel 15.

The detailed structure of the work rest 7 is shown in a perspective view and a front view in FIGS. The work rest 7 is composed of a rest base 21, a holder 22 and a blade 23 as main members. Rest base 21 is floor plate 6
Is fixed to the upper surface of the blade with bolts 24, and has a slide surface 26 in a direction orthogonal to the receiving surface 25 of the blade 23. The holder 22 is slidable and fixable in the vertical direction with respect to the slide surface 26, and has an L-shaped notch 27 for mounting the blade 23 on the upper end thereof. The blade 23 is fixed with a bolt 28 while being fitted in the notch 27. A height adjusting plate 29 for adjusting the vertical position of the blade 23 is interposed between the bottom surface of the blade 23 and the notch 27 as necessary.

As the guide structure of the rest base 21 and the holder 22 on the slide surface 26, a guide structure having a dovetail groove 31 as shown in FIG. 1 can be adopted, and a clamp (not shown) provided on the side surface of the dovetail groove 31. By pressing the plate against the side surface of the dovetail 33 with the bolt 32, the rest base 2
A structure for fixing the relative position of 1 and the holder 22 can be adopted. The vertical movement of the holder 22 along the slide surface 26 causes the rack and pinion mechanism 3 to move between the holder 22 and the rest base 21.
It is possible to adopt a structure in which the pinions 4 and 35 are provided and the pinion shaft 36 projecting from the side surface of the workrest 7 is rotated to move up and down. Further, on the front side surface of the slide surface 26, a scale 3 indicating the relative movement amount of the rest base 21 and the holder 22 is provided.
7 and a pointer 38 are provided.

At the time of setup work, as described in the section of the above-mentioned operation, the holder 2 is referenced with the scale 37 as a reference.
2 is moved by the radius difference of the work 12 and if the center height h of the work needs to be adjusted, the height adjusting plate 29 corresponding to the difference is provided in the bottom surface of the blade 23 and the L-shaped cut 2 in the holder.
It is only necessary to insert (or replace) between the holder 7 and 7, and then actually perform test grinding and then finely adjust the height of the holder 22 based on the result.

When the diameter of the work 12 is greatly changed, it is difficult for the blade 23 to handle all of them. Therefore, as shown by an imaginary line in FIG. Is a thick and low-height blade 23, and a thin blade and a high-height blade 23a are prepared for those having a small diameter. All blades that can be processed by exchanging several kinds of blades are used. Be able to handle workpieces of different diameters.

[0022]

In the work rest of the present invention described above, the height of the blade of the work rest can be adjusted to some extent without sacrificing the rigidity of the work rest supporting portion of the bed or the slide base. Frequent replacement of the blade when the diameter of the work is changed can be avoided, and the cost of the device is not increased. Furthermore, frequent blade replacements are not required during setup changes, and the amount of movement of the blade of the work rest can be intuitively grasped according to the diameter difference of the workpiece, so adjustment work is easy and error occurrences can be avoided. The excellent effect that the contact line between the blade and the work does not change when the blade height is changed is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of the present invention.

2 is a more detailed front view of FIG.

FIG. 3 is a schematic front view showing an example of a centerless grinding machine.

FIG. 4 is an explanatory diagram of a work supporting state in a centerless grinding machine.

FIG. 5 is a detailed explanatory view of a contact portion between a blade and a work.

FIG. 6 is a schematic front view of a first conventional structure.

FIG. 7 is a schematic front view of a second conventional structure.

[Explanation of symbols]

 3 Grinding wheel 15 Adjusting wheel 23 Blade 25 Receiving surface 26 Sliding surface

Claims (1)

[Claims] 1. A grinding wheel (3) for a centerless grinder and a control wheel (1)
The blade (23) of the work rest that supports the lower outer periphery of the work with (5) is mounted via the slide surface (26) in the direction orthogonal to the work receiving surface (25), and the blade (23)
Is a work rest for a centerless grinding machine, wherein the work rest can be vertically moved and fixed along the slide surface (26).