JP2018187735A - Rotary feeder for centerless grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary feeder which does not require adjustment in association with movement of a base line of a work-piece, and of which down-sizing is possible.SOLUTION: A rotary feeder 10 for a centerless grinder comprises a plurality of pairs of rollers 20 located on left and right sides of a lower part of a work-piece W having a circular cross section in a center axis A direction of the work-piece, and moves the work-piece in the central axis direction while rotating the work-piece around the center axis thereof by drive power of the roller. In this feeder, a rotary shaft 21 of the roller is inclined in no-parallel to a horizontal plane when viewed from the front, and is inclined at a non-right angle to the central axis of the work-piece when viewed from the side, and thereby the roller comes into contact with the work-piece at a peripheral edge part 22 of a surface thereof. In the case that an inclination angle of a flat surface of a left side roller is so made as to be coincident with an inclination angle θ of an upper end surface of a blade 103, base lines of the work-piece at a centerless grinder 100 and the rotary feeder become coincident with each other, and thus, it is not required to adjust positions of left and right rollers in accordance with movement of the base line of the work-piece.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotary feed device for a centerless grinding machine that does not require adjustment accompanying the movement of the center of a workpiece during grinding and can be reduced in size.

As a grinding machine that grinds the outer periphery of a workpiece with a circular cross section such as a cylinder or cylinder, when the center axis direction of the workpiece is the front-rear direction, the outer periphery of the workpiece is supported from the left and right by a grinding wheel and adjustment wheel, and the workpiece rest A centerless grinding machine is known which is supported from below by a blade of this type.
The workpiece is supplied to and discharged from the centerless grinding machine using a rotary feeder.
As a general rotary feed device, for example, Patent Document 1 discloses a rotary feed device including a V-shaped receiver that supports a workpiece from below and a roller having a rotating surface inclined at a certain angle with respect to the center axis of the workpiece. Has been. The circumferential surface of the roller is in contact with the workpiece, and when the roller is rotated, the workpiece receives the component force of the driving force of the roller and moves forward (axial direction) while rotating around the axis.
Further, Patent Document 2 discloses a rotary feeding device including a support roll unit in which rolls are arranged on the left and right sides of a work instead of a V-shaped receiver. The work is rotated and moved forward by a rotary drive roll unit provided separately from the support roll unit.
Patent Document 3 discloses a rotary feeding device in which some of a plurality of rollers arranged on the left and right of the lower part of a work are driving rollers and the rest are driven rollers. The workpiece is supported on the circumferential surface of each roller. The rotating surface of each roller is inclined with respect to the center axis of the work, and the work is rotated and moved forward by rotating the driving roller.

JP 2003-148580 A Utility Model Registration No. 3139493 JP-A-8-90394

However, the prior art has the following problems.
That is, in Patent Documents 1 and 2, since the mechanism for rotating and moving the workpiece forward is provided separately from the mechanism for supporting the workpiece, there is a problem that the number of parts of the device increases and the size increases. There is.
Further, the diameter of the workpiece being ground gradually decreases in a state of being sandwiched between the grinding wheel, the adjusting wheel, and the blade. Accordingly, the workpiece moves along the upper end surface of the blade, and the center of the workpiece (the axis of the workpiece) also moves. In the case of a configuration in which the lower part of the work is supported from the left and right by the circumferential surfaces of a plurality of rollers as in Patent Document 3, the positions of the left and right rollers must be adjusted according to the movement of the center of the work. There is a problem of increasing.

  In view of such a problem, an object of the present invention is to provide a rotary feeding device that does not require adjustment accompanying the movement of the center of a workpiece and can be miniaturized.

The rotary feeding device of the present invention includes a plurality of rollers arranged on the left and right of the lower part of a work having a circular cross section in the direction of the central axis of the work, and the work is moved around the central axis by the driving force of the rollers. In a rotary feed device for a centerless grinding machine that moves in the direction of the central axis while rotating, the rotation shaft of the roller is inclined non-parallel to the horizontal plane when viewed from the front and the workpiece when viewed from the side. In this case, the roller contacts the workpiece at the peripheral edge of the surface thereof.
The peripheral edge is an inclined surface, and the peripheral edge is in surface contact with the workpiece.

In the rotary feeding device of the present invention, the work is supported not by the circumferential surfaces of the left and right rollers as in the prior art, but by the peripheral edge portions of the surfaces of the left and right rollers. Therefore, if the inclination angle of the surface of the left roller of the pair of left and right rollers coincides with the inclination angle of the upper end surface of the blade of the centerless grinding machine (for example, 60 ° with respect to the vertical surface), centerless grinding The center of the workpiece matches between the board and the rotary feeder. This eliminates the need to adjust the positions of the left and right rollers in accordance with the movement of the center of the work accompanying grinding as in the prior art.
In addition, if the peripheral edge of the roller surface is inclined and brought into surface contact with the workpiece, the pressure acting on the peripheral edge from the workpiece (surface pressure) is reduced, so the wear on the peripheral edge is suppressed. This can reduce the frequency of roller replacement.
If the roller is directly connected to the rotation shaft of the motor, the rotation feeding device can be reduced in size and the manufacturing cost can be reduced as compared with the configuration in which the rotation driving force of the motor is transmitted to the roller via a belt or gear. be able to.
Further, by directly connecting the rollers to the rotation shaft of the motor, the distance between the pair of rollers that are continuous in the front-rear direction can be reduced. In general, a workpiece having a small diameter has a large amount of bending due to its own weight. However, if the support pitch of the workpiece is narrowed by narrowing the distance between the pair of rollers, the amount of bending due to the weight of the small diameter workpiece can be reduced.
On the other hand, if the roller is connected to the rotating shaft of the motor via a bearing or the like, it can cope with heavy workpieces.

Front view showing a state where a workpiece is supported by a grinding wheel, adjustment wheel and blade in a centerless grinding machine A plan view (a), a front view (b) showing a rotary feed device, a diagram (c) and a partially enlarged view (d) schematically showing the contact state between the peripheral portion of the roller surface and the workpiece. Plan view showing driving force acting on workpiece from roller Front view showing a configuration in which the roller is not directly connected to the rotation shaft of the motor, but is connected to the rotation shaft of the motor via a separately provided bearing or the like.

An embodiment of the rotary feeding device of the present invention will be described. The rotary feeding device is used for supplying the workpiece to the centerless grinder and discharging the workpiece from the centerless grinder.
As shown in FIG. 1, the workpiece W has a circular cross section such as a column or cylinder. The centerless grinding machine 100 supports the outer peripheral surface of the workpiece W from the left and right directions with the grinding wheel 101 and the adjusting wheel 102 and grinds the outer peripheral surface of the workpiece W with the grinding wheel 101 while supporting the outer surface with the blade 103 from below. In the following description, the direction of the central axis A of the workpiece W is referred to as “front-rear direction”.
The diameter of the workpiece W gradually decreases from the state indicated by the broken line to the state indicated by the solid line by grinding. Accordingly, the workpiece W moves along the upper end surface of the blade 103, and the central axis A (passage center) of the workpiece W also moves.

As shown in FIG. 2, the rotary feeding device 10 moves the workpiece W in the front-rear direction while rotating around the central axis A, and is roughly composed of a roller 20 and a motor 30.
The roller 20 is a disk-shaped member and is disposed on the left side and the right side of the lower part of the work W to form a pair. Although not shown, a plurality of pairs of rollers 20 are arranged in the front-rear direction.
As shown in FIG. 2B, when viewed from the front, the rotating shaft 21 of the roller 20 is inclined at an angle α non-parallel to the horizontal plane. The angle α may be in the range of 0 ° <α <90 °, but in particular, the angle α is set so that the inclination angle of the surface of the roller 20 coincides with the inclination angle θ (see FIG. 1) of the upper end surface of the blade 103. It is preferable to set. For example, when the inclination angle of the upper end surface of the blade 103 is 60 °, it is preferable to set the angle α = 60 ° so that the inclination angle of the surface of the roller 20 is 60 °. As a result, the center of the workpiece W can be matched between the centerless grinding machine 100 and the rotary feeder 10.
In addition, when viewed from the side as shown in FIG. 2 (c), the rotating shaft 21 of the roller 20 is inclined at an angle β (0 ° <β <90 °) non-perpendicular to the central axis A of the workpiece W. Yes. The angle β may be in the range of 0 ° <β <90 °, but if the angle β is too large, the length in the front-rear direction including the motor 30 becomes large, and therefore preferably about 0 ° <β ≦ 10 °.
As shown in FIG. 2 (d), the peripheral edge 22 of the surface of the roller 20 is formed of an inclined surface. In other words, the peripheral edge portion 22 becomes thinner (thinner) as it goes radially outward. As shown in FIG. 2 (a), each roller 20 comes into contact with the lower portion of the workpiece W at the peripheral edge 22 on the surface thereof, thereby supporting the workpiece W in surface contact. Only the peripheral portion 22 may be made of an elastic material such as urethane, or the entire roller 20 may be made of an elastic material.

The motor 30 is fixed to the base 40. Then, by directly connecting the roller 20 to the rotating shaft 31 of the motor 30, the rotating shaft 21 of the roller 20 and the rotating shaft 31 of the motor 30 are matched.
As shown in FIG. 3, the workpiece W receives a driving force F generated by the rotation of the roller 20 at a contact point with each roller 20. The workpiece W moves forward by the axial component force F2 while rotating around the central axis by the circumferential component force F1 of the driving force. The workpiece W can be moved backward by rotating the roller 20 in the reverse direction.

In the present embodiment, the peripheral edge portion 22 of the roller 20 is configured as an inclined surface, but a flat surface, that is, the thickness of the roller 20 may be constant instead of the inclined surface.
In addition, the roller 20 is directly connected to the rotating shaft 31 of the motor 30. However, the present invention is not limited to this, and the rotating driving force of the motor 30 is applied to the rotating shaft of the roller 20 via the bearing 50, the belt 51, etc. as shown in FIG. It may be configured to transmit to 21.

  The present invention is a rotary feeding device that does not require adjustment accompanying the movement of the center of a workpiece and can be miniaturized, and has industrial applicability.

A Center axis
F Driving force
F1 Circumferential force
F2 Axial component force
W Work
10 Rotating feeder
20 Laura
21 Roller axis
22 Edge
30 motor
31 Motor rotating shaft
40 base
50 Bearing
51 belt
100 centerless grinding machine
101 grinding wheel
102 Adjustment car
103 blade

Claims (2)

A plurality of rollers arranged on the left and right of the lower part of the workpiece having a circular cross section are provided in the central axis direction of the workpiece, and the workpiece is moved in the central axis direction while rotating the workpiece around the central axis by the driving force of the rollers. In a rotary feed device for a centerless grinding machine,
The rotation axis of the roller is inclined non-parallel to the horizontal plane when viewed from the front, and is inclined non-perpendicular to the central axis of the workpiece when viewed from the side, so that the roller A rotary feeding device that contacts the workpiece at a peripheral edge. 2. The rotary feeding device according to claim 1, wherein the peripheral edge is an inclined surface, and the peripheral edge is in surface contact with the workpiece.

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