JPH0360623B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a centerless grinding machine, and in particular, the axle of an adjusting wheel can be tilted with respect to a horizontal plane, and the bearing frame of the adjusting wheel can be tilted at a set tilted position. This invention relates to a centerless grinder that can be rigidly fixed to a chassis.

[Prior art and problems]

Generally, a centerless grinder is a machine tool that inserts a workpiece between a grinding wheel and an adjustment wheel, and grinds the outer periphery of the workpiece while supporting the workpiece on a work rest. The feed motion for the workpiece uses the longitudinal thrust force generated when the axle of the adjusting wheel is tilted at a small angle with respect to the horizontal plane, and this method is known as the through-feed method. .

In order to tilt the axle of the adjustment wheel in this way,
The bearing frame that pivotally supports the adjustment wheel is pivoted in a vertical plane about a pivot pin. FIG. 5 shows an outline of the structure of this type of conventional centerless grinding machine. In the figure, reference numeral 1 indicates a bed, and a table 2 is placed on the bed 1 on a horizontal plane with a swivel pin 3 as the center. The adjustment wheel table 4 is slidably mounted on the table 2. A work rest 5 is erected at the end of the adjustment wheel table 4, and a chassis 6 is slidably mounted on the adjustment wheel table 4. This chassis 6 is adapted to be moved in the left and right directions in the figure by a feed screw 7. Further, a bearing frame 9 that is movable in a vertical plane around a rotation pin 8 is attached to the vertical front surface 6a of the chassis 6, and an adjustment wheel 1 is attached to the bearing frame 9.
0 is pivotally supported, and the axle 10a of this adjustment wheel 10 is
By rotating the bearing frame 9 about the pivot pin 8, the angle of inclination with respect to the horizontal plane can be adjusted.

However, in the above-mentioned conventional centerless grinding machine, since the bearing frame 9 is suspended from the chassis 6, the rigidity of the support mechanism of the adjustment wheel is not sufficient, and chatter tends to occur during the grinding process. There was a problem. In addition, in this conventional device, as shown in FIG.
Since the adjustment wheel 10 must be mounted above the machine, there is a problem in that when the shaft of the adjustment wheel 10 is removed vertically upward, the chassis 6 must be moved back outside the processing range.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a centerless grinding machine that has a simple structure, increases the rigidity of the support mechanism for the adjusting wheel, and allows the sliding range of the movable member to be short.

[Summary of the invention]

In order to achieve the above object, a centerless grinding machine according to the present invention includes an adjusting wheel, a bearing frame rotatably supporting the adjusting wheel and having a bottom surface formed by an outer cylindrical surface, and a bottom surface of the bearing frame. a vehicle chassis having an inner cylindrical surface capable of sliding contact with the chassis; and an inclination angle adjustment device that tilts the axis of the adjustment wheel with respect to a horizontal plane by moving a bearing frame on the chassis in the circumferential direction.
The present invention is characterized by comprising a locking device for fixing the bearing frame to the vehicle chassis under a set angle of inclination.

[Embodiments of the invention]

An embodiment of a centerless grinder according to the present invention will be described below with reference to the drawings. In Figure 1, reference numeral 1
Reference numeral 1 indicates a fixed bed, and a table 12 is slidably placed on the bed 11.
This table 12 is guided and slid along a guide surface such as a dovetail groove, and is given reciprocating motion by a feed screw 13. This feed screw 13 is provided protruding from the lower surface of the table 12 and is screwed together with a feed nut 14, and the feed screw 13 is rotationally driven by a pulse motor 15. Further, a work rest 16 is provided upright on the top surface of the tip of the table 12, and a blade 17 for supporting a workpiece is planted on the top surface of this work rest 16.

On the other hand, on the top surface of the table 12, a chassis 18 is provided.
The chassis 18 is pivoted around a swivel pin 19 protruding from the table 12 so as to be pivotable within a small angle range. Above chassis 18
The upper surface of is formed by an inner cylindrical surface 20, and this inner cylindrical surface 20 is formed by a circular arc surface having a radius R centered on the center of curvature 0. Note that a part of the center of the inner cylindrical surface 20 is cut out to form an escape groove 2.
It is said to be 1.

A bearing frame 22 is mounted on the chassis 18 so as to be in surface contact with each other, and therefore the bottom surface of the bearing frame 22 forms an outer cylindrical surface 23 having the same curvature as the inner cylindrical surface 20. There is.
There are two arms 2 on both sides of this bearing frame 22.
4 and 24 are provided upright, and an axle 26, 26 of an adjusting wheel 25 is supported between these arms. The angle of inclination of the axis of the axle 26 of the adjustment wheel 25 with respect to the horizontal plane can be adjusted as follows.

Next, a device for adjusting the inclination angle of the axle 26 will be explained with reference to FIG.

Mounted on the chassis 18 is an inclination angle adjustment bolt 27 that can be rotated from one side. This adjustment bolt 27 is a bolt with a hexagonal hole, and a cap 28 is provided on the outside of the head 27a of the bolt to allow only rotation of the bolt and to restrict movement in the axial direction. There is.

The male threaded portion 27b of the adjustment bolt 27 is screwed to the female threaded portion 29a of the sliding piece 29, so that the sliding piece 29 can move horizontally within a predetermined stroke range.

On the other hand, a guide bar 30 is fixed to the bottom surface of the bearing frame 22 with a key 31.
0 extends in a direction perpendicular to the plane of the paper in FIG. 3, and both sides thereof are formed by outer cylindrical surfaces. Guide rollers 32, 32, ... 32 are arranged so as to sandwich this guide bar 30, and each of these guide rollers 32, 32, ... 32 is supported by a shaft 33 installed on the sliding piece 29 side. There is. Next, attach the bearing frame 22 to the chassis 1.
3 regarding the locking device 34 which is fixed to 8.
This will be explained with reference to the figures. The lock device 34 consists of a lock bolt 35 and a T-shaped lock nut 36.
The T-shaped lock nut 36 is loosely fitted into a T-groove 37 bored in the bottom surface of the bearing frame 22.
A lock bolt 35 is screwed into this T-shaped lock nut 36, and by tightening the lock bolt 35 using a wrench or the like, the bearing frame 2
The outer cylindrical surface 23 of 2 is connected to the inner cylindrical surface 20 of the chassis 18.
It can be tightened against. The T-shaped lock nut 36 has a plate shape that is long in the axial direction, and has a plurality of lock bolts 35 spaced apart in the axial direction.
You can also screw it in. By rotating the lock bolt 35 in this manner, the bearing frame 22 can be loosened or tightened.

Further, according to the present invention, the chassis 18 can be moved toward and away from the blade 17 while the lock bolt 35 is relaxed. At this time, the outer cylindrical surface 23 of the bearing frame 22 and the inner cylindrical surface 20 of the chassis 18 slide against each other in the axial direction.
The feed movement for this purpose is provided by a feed screw 38. As is clear from FIG. 4, the feed screw 38 is attached to a bracket 39 fixed to the end of the chassis 18.
is supported so that it cannot move in the axial direction by
A handle 40 is attached to its tip, and the feed screw 38 can be rotated by rotating the handle 40. On the other hand, this feed screw 38 is screwed to a nut 41 fixed to the bearing frame 22 side. Therefore, by rotating the feed screw 38 in the forward and reverse directions, the bearing frame 22 is moved toward and away from the blade 17, so that the distance between the adjustment wheel 25 and the blade 17 can be adjusted.

Note that reference numeral 42 in FIG. 1 indicates a fixing bolt for fixing the chassis 18 to the table 12.

Next, the operation of the centerless grinder described above will be explained. First, to set the inclination angle of the adjusting wheel 25 with respect to the horizontal plane of the axle 26, loosen the locking bolt 35, insert a wrench into the socket hole of the adjusting bolt 27, rotate it, move the sliding piece 29 in the tangential direction, and move the guide roller 32. and guide bar 30
By rotating the bearing frame 22 by a predetermined amount in a predetermined direction about the center 0 via the axial center of the adjusting wheel 25, the axis of the axle 26 of the adjusting wheel 25 can be tilted with respect to the horizontal plane. After setting the angle, tighten the lock bolt 35 and attach the bearing frame 22 to the chassis 18.
Connect rigidly to On the other hand, adjustment wheel 25
When it is necessary to adjust the distance between the blade 17 and the blade 17, loosen the lock bolt 35, then rotate the handle 40 to rotate the feed screw 38.
It is sufficient to move the bearing frame 22 back and forth.

Note that when the bearing frame 22 is rotated around the center 0, the contact point of the adjusting wheel 25 with respect to the workpiece is offset in the left-right direction, so in order to correct this, as shown in FIG. Adjustment screw rod 43R, 4 whose tip is pressed against the swivel pin 19
By turning one side of 3L in the tightening direction and the other in the loosening direction, the chassis 18 can be moved horizontally with respect to the table 12 for adjustment.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the top surface of the chassis is configured with an inner cylindrical surface, and the bottom surface of the bearing frame is configured with an outer cylindrical surface, so that the two are in curved contact with each other. The adjustment wheel allows the axle to be tilted at any angle with respect to the horizontal plane around the center of curvature, and the rigidity of the support mechanism can be increased when both cylindrical surfaces are tightened at a set angle. Therefore, it is effective in eliminating the chatter phenomenon during grinding. In addition, unlike conventional models, it is now possible to install the adjustment wheel correction device on the back side of the bearing frame.As a result, the backward stroke of the bearing frame can be reduced even when the adjustment wheel is removed, and the overall structure can be reduced. It can be made compact and inexpensive.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the centerless grinder according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is an angle adjustment mechanism of the axle of the adjusting wheel. FIG. 4 is a cross-sectional view showing the adjusting wheel feeding mechanism, and FIG. 5 is a side cross-sectional view showing the schematic structure of a conventional centerless grinder. 18... Chassis, 20... Inner cylindrical surface, 22...
Bearing frame, 23... Outer cylindrical surface, 25... Adjustment wheel, 26... Axle, 27... Adjustment bolt, 29
...Sliding piece, 30...Guide bar, 31...
Key, 32...Guide roller, 34...Lock device, 36...Lock nut, 37...Nut receiving hole, 38...Feed screw.

Claims (1)

[Claims] 1. An adjusting wheel, rotatably supporting the adjusting wheel,
A bearing frame whose bottom surface is formed by an outer cylindrical surface, a vehicle chassis having an inner cylindrical surface that can be slid into contact with the bottom surface of the bearing frame, and an adjustment wheel that moves the bearing frame on the chassis in the circumferential direction. A centerless grinding machine comprising an inclination angle adjustment device that inclines an axis with respect to a horizontal plane, and a locking device that fixes a bearing frame to a chassis under a set inclination angle. 2. The inclination angle adjustment device includes an adjustment screw which is restrained from moving in the axial direction and is rotatably incorporated into the vehicle chassis, and a male threaded portion of the adjustment screw is threadedly coupled to the adjustment screw so that the adjustment screw is tangential to the inner cylindrical surface. Centerless grinding according to claim 1, characterized in that it is composed of a sliding piece movable in a direction and a coupling device for pivotally connecting the sliding piece and the bearing frame. Board. 3 The coupling device is fixed to the center of the bottom surface of the bearing frame with a key, and has a guide bar whose side surface is formed by a part of the outer cylindrical surface, and the coupling device rotates to the top surface of the sliding piece so as to sandwich the guide bar. Claim 2, characterized in that it is constituted by a plurality of guide rollers that are supported so as to
The centerless grinding machine described in . 4. The centerless grinding machine according to claim 1, wherein the bearing frame is configured such that a bottom surface formed of an outer cylindrical surface can slide in the axial direction along an inner cylindrical surface of the chassis. .