JP2935069B2 - Centerless grinding method and centerless grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centerless grinding method and a centerless machine particularly suitable for a long workpiece.

[0002]

2. Description of the Related Art In a conventional centerless grinding machine for performing feed-through grinding, a workpiece is fed in a fixed direction between a grinding wheel and an adjustment wheel, and grinding is performed during this time. .

[0003]

When a long workpiece is ground by the above-mentioned conventional centerless grinding machine, the long workpiece cannot be bent by one ordinary feed-through grinding, so that it is required to carry out several passes. Feed grinding must be performed. However, in the conventional centerless grinding machine, since the workpiece is fed only in one direction as described above, it is difficult to automate the feed grinding a plurality of times. For this reason, conventionally, a worker has to repeat the work of receiving a workpiece at the outlet of the grinding machine and carrying it in from the entrance side of the grinding machine each time, and there is a problem that the work is troublesome and time-consuming.

An object of the present invention is to solve the above problems,
The method can accurately and efficiently grinding an elongated workpiece Oyo
And grinding machines .

[0005]

A centerless grinding method according to the present invention is provided between an adjusting wheel and a grinding wheel and an adjusting wheel.
Workpieces are rotatably supported and adjusted by the receiving plate
The present invention is characterized in that a workpiece on a receiving plate is ground by reciprocating feed for reciprocating one or more times between a grinding wheel and an adjusting wheel by switching a swivel angle and a feed angle of a wheel.

Further, a centerless grinding machine according to the present invention.
Is a grinding wheel that extends in the front-rear direction and an adjustment that extends in the front-rear direction
Adjust the swivel angle and feed angle of the car and the adjustment car.
The work can be transported in either direction
A front transfer device provided in front of the grinding wheel and the adjusting wheel; and
Workpieces can be conveyed in both front and rear directions and coordinated with grinding wheels.
A rear transport device provided behind the trimming wheel, and a grinding wheel
Reciprocating passage that makes one or more reciprocations between the machine and the adjustment wheel
It is characterized in that the workpiece is ground by feeding.
You.

Adjusting means in the centerless grinding machine
But a hollow box-shaped adjustment chassis that moves in the left-right direction
Adjustment wheel cover that supports rotating shaft and fixed to adjustment chassis
And a clamp cylinder
Clamp the adjustment wheel cover with the clamp plate fixed to the rod.
To fix the adjustment wheel at the desired feed angle
There is.

[0008] Further, the adjusting wheel according to the workpiece feeding direction
Feed angle switching drive and swivel angle switching drive for adjusting wheels
Equipped with a computer numerical controller that performs numerical control
May be.

[0009]

[Function] Adjust the swivel angle and feed angle of the adjusting wheel
Switch the workpiece feed direction and change the transport direction of the transport device.
Since the workpiece is switched and the workpiece is passed between the grinding wheel and the adjusting wheel a plurality of times, the workpiece can be ground with high precision. Also,
Since the workpiece is reciprocated, there is no need to return the workpiece from the exit to the entrance of the grinding machine, so that grinding can be performed in a short time and automation is easy.

The setting and control are easy if the drive for switching the feed angle of the adjustment wheel and the drive for switching the swivel angle of the adjustment wheel according to the feed direction of the workpiece are performed by numerical control using a computer.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a schematic configuration of a centerless grinding machine, FIGS. 4 and 5 show a specific configuration of a main part thereof, and FIG. 6 shows an electrical configuration, respectively. In the following description, the left side of FIGS. 1 and 2 is the front, the right side is the rear, and the left and right when viewed from the front is the left and right.

As shown in FIGS. 1 to 3, the grinding machine includes a grinding wheel (1) and an adjusting wheel (2) arranged side by side. The rotation axis (1a) of the grinding wheel (1) extends horizontally in the front-rear direction.

The rotation axis (2a) of the adjusting wheel (2) extends in the front-rear direction, and as will be described later, the angle (swivel angle) of the rotation axis (2a) in a horizontal plane and the rotation axis (Swivel angle) in a vertical plane. Two
The angle (feed angle) of a) can be adjusted.
A receiving plate (blade) (3) is provided below between the grinding wheel (1) and the adjusting wheel (2). At the upper end of the receiving plate (3), a work receiving surface (3a) inclined toward the adjustment wheel (2) is formed. A pair of left and right front workpiece guides (4) are provided in front of the grinding wheel (1) and the adjusting wheel (2), and a pair of right and left rear workpiece guides (5) are provided in the rear.

Although a specific configuration is not shown in FIGS. 1 to 3, a front work transfer device is provided in front of the grinding wheel (1) and the adjustment wheel (2), and a rear work transfer device is provided in the rear. Is provided.

In these transfer devices, the transfer direction of the work (W) is switched, and the work (W) can be transferred in any direction. The front transfer device and the rear transfer device are indicated by reference numerals (6) and (7) in FIG.
Further, a first limit switch (LS) (8) is provided at an appropriate position of the front transfer device (6), and a second limit switch (LS) (9) is provided at an appropriate position of the rear transfer device (7). .

As shown in FIGS. 4 and 5, a turntable (10) is mounted on a base of a grinding machine (not shown). Although the illustration of the specific configuration is omitted, the swivel (10) can be swiveled about a vertical axis by a swivel angle adjusting motor. The swivel angle adjusting motor and its driving device are indicated by reference numerals (11) and (12) in FIG.

An adjusting chassis (13) is mounted on the swivel (10) so as to be able to move in a horizontal direction substantially in the left-right direction. The adjusting chassis (13) has a hollow box shape, and its left end wall (13a)
The feed angle adjusting shaft (14) is rotatably supported via a metal bearing (15). The adjustment shaft (14) extends in a horizontal direction parallel to the moving direction of the adjustment chassis (13), and a worm wheel (16) is fixedly provided at the right end of the adjustment shaft (14) in the platform (13). . A worm shaft (17) extending substantially horizontally in the front-rear direction is rotatably supported on the inner surface of the left end wall (13a) of the adjustment chassis (13) via a plurality of bearings (18). A worm (19) engaging with 16) is fixedly provided. Worm axis
(17) extends forward through the rear wall (13b) of the adjusting chassis (13), and is connected to a feed angle adjusting motor (20) mounted on the outer surface of the rear wall (13b). The adjusting motor (20) is composed of a servomotor, and its driving device is indicated by reference numeral (21) in FIG.

Immediately to the right of the left end wall (13a) of the adjusting chassis (13), recesses (22) are formed at four corners, up, down, front and rear, and clamped on the left end wall (13a) of each recess (22). Cylinder (23)
Is fixed to the left. Rod (2) for each cylinder (23)
3a) penetrates the left end wall (13a), and a disk-shaped clamp plate (24) is fixedly provided at the left end. The driving device for these cylinders (23) is shown in FIG.
Indicated by

An adjustment wheel cover (26) is arranged on the outer surface of the left end wall (13a) of the adjustment chassis (13). The cover (26) has a substantially box shape with the left side and the bottom left open, and the right end wall (26a) has a low circular projection (27) formed on the outer surface thereof and the left end wall (13a) of the adjusting chassis (13). Is fitted in a shallow circular recess (28) formed in the outer surface of the. And the left part of the adjustment shaft (14) is the cover (26)
Through the hole (29) formed in the center of the right end wall (26a) of
It is fixed by a key (30) and a nut (31). cover
On the inner surface of the right end wall (26a) of (26), a protective cover (32) for covering the end of the adjustment shaft (14) and the nut (31) is attached.

At the outer surface of the right end wall (26a) of the cover (26), an arc-shaped clamp groove (33) centering on the hole (29) is formed at four positions, that is, upper and lower and front and rear. These only (3
One end of 3) is open at the front or rear surface of the cover (32). On the outer surface of the right end wall (26a), projecting portions (34) approaching each other are formed on both sides of each groove (33). The rod (23a) of the corresponding cylinder (23) fits the overhang (3
4), and the clamp plate (24) is fitted in the groove (33) at the back. Then, by shrinking the four cylinders (23) and moving (retreating) the rod (23a) to the right, the cover (26) is pressed against the adjustment chassis (13) and clamped, and conversely, the cylinder ( The cover (26) is unclamped by extending (23) and moving (advancing) the rod (23a) to the left.

Adjustment wheels are attached to the front and rear walls (26b) and (26c) of the cover (26).
Both ends of the shaft of (2) are rotatably supported, and a part of the adjusting wheel (2) projects to the left of the cover (26). Although not shown, the adjusting wheel (2) is configured to be rotated at a constant speed in a constant direction by a motor. The adjusting vehicle drive motor and its driving device are indicated by reference numerals (35) and (35) in FIG.
(36).

The grinding wheel (1) is also rotated at a constant speed in a constant direction by a motor. The grinding wheel drive motor and its drive device are indicated by reference numerals (37) and (38) in FIG.

By rotating the feed angle adjustment motor (20) with the adjustment wheel cover (26) unclamped as described above, the adjustment shaft (14) is rotated, and the adjustment shaft (14) is rotated about the adjustment shaft (14). (2) is also tilted, its feed angle is adjusted, and the adjustment motor (20)
To stop and clamp the cover (26),
The adjusting wheel (2) is fixed at an arbitrary feed angle. And FIG.
When the feed angle is adjusted so that the front side becomes higher as shown by the solid line, the rearward thrust acts on the workpiece (W) by the rotation of the adjusting wheel (2), and conversely, as shown by the chain line in FIG. When the feed angle is adjusted so that the rear side becomes higher, a forward thrust acts on the workpiece (W) by rotation of the adjusting wheel (2). Further, by turning the swivel table (10) by the swivel angle adjusting motor (11), the adjusting wheel (2) is tilted in the horizontal plane, and the swivel angle is adjusted.

As shown in FIG. 6, the grinding machine includes a computer numerical controller (CNC) (39). This device (39) controls the entire grinding machine using a computer, and the above-described units are connected thereto.

The number of repetitions of through grinding and the like can be set in the CNC device (39).

In the above-mentioned grinding machine, grinding is performed as follows.

First, a workpiece (W) is loaded (placed) at a predetermined position of the front transfer device (6) by the loading device. This may be performed by an operator. At this time,
The front and rear transfer devices (6) and (7) are driven backward, and FIG.
As shown by the solid line, the feed angle of the adjustment wheel (2) is adjusted in a direction to generate a backward thrust. The swivel angle is adjusted so that the distance between the grinding wheel (1) and the adjusting wheel (2) is slightly wider on the front side. Workpiece (W) in front transfer device (6)
When the workpiece (W) is loaded,
Is retracted and enters from the front side where the distance between the grinding wheel (1) and the adjusting wheel (2) is widened. The rear end of the workpiece (W) is a grinding wheel
When (1) and the adjustment wheel (2) are in contact with each other, a backward thrust acts on the workpiece (W) due to these rotations, and the workpiece (W)
(3) Retreat on top, during which grinding takes place. Grinding wheel
The work (W) which has come out backward from between (1) and the adjusting wheel (2) is sent backward by the rear transfer device (7), and as shown by a chain line in FIGS. ) Retracts further and the grinding wheel
When moving away from (1) and the adjustment wheel (2), the second LS (9) operates, the rear transfer device (7) stops, and the workpiece (W) stops. Then, as shown by a dashed line in FIG. 1, the feed angle of the adjusting wheel (2) is switched in the reverse direction so as to generate a forward thrust, and the swivel angle is also reduced to a distance between the grinding wheel (1) and the adjusting wheel (2). It is switched so that the rear side is slightly wider. Next, after the front and rear transfer devices (6) and (7) are driven forward, the workpiece (W) is advanced, and the space between the grinding wheel (1) and the adjusting wheel (2) is increased. Enter from the side. The front end of the workpiece (W) is a grinding wheel
When (1) and the adjustment wheel (2) are in contact with each other, the adjustment wheel (2) has a feed angle opposite to that of the front.
A forward thrust acts on (W), and the workpiece (W) advances on the receiving plate (3), during which grinding is performed. The workpiece (W) that has come forward from between the grinding wheel (1) and the adjusting wheel (2) is the front transfer device.
When the workpiece (W) further moves forward and separates from the grinding wheel (1) and the adjusting wheel (2) as shown by solid lines in FIGS. 1 and 2, the first LS (8) is activated,
The front transfer device (6) stops, and the workpiece (W) stops. Then, the feed angle and the swivel angle of the adjusting wheel (2) are again switched to the previous state, and the workpiece (W) is fed later to perform grinding as described above. Such an operation is repeated a set number of times. Each time the feed direction of the workpiece (W) is switched, the adjusting wheel (2) is gradually cut to finish the outer diameter of the workpiece (W), and the bending accuracy is gradually improved.

[0029]

According to the grinding method and the grinding machine of the present invention, as described above, a long workpiece can be accurately and efficiently ground, and automation can be easily performed.

Further, setting and control can be easily performed by performing numerical control using a computer for driving the switching of the feed angle of the adjusting wheel and the driving for switching the swivel angle of the adjusting wheel according to the feed direction of the workpiece.

[Brief description of the drawings]

FIG. 1 is a schematic right side view of a centerless grinding machine showing an embodiment of the present invention.

FIG. 2 is a schematic plan view of the centerless grinding machine.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a partially cutaway front view showing an enlarged portion of an adjustment wheel.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a block diagram showing an electrical configuration of the centerless grinding machine.

[Explanation of symbols]

(1) Grinding wheel (2) Adjustment wheel (2a) Rotary axis (6) Front transfer device (7) Rear transfer device (13) Adjustment chassis (26) Adjustment wheel cover (39) Computer numerical controller

Claims (4)

(57) [Claims] An adjusting wheel is provided between a grinding wheel and an adjusting wheel.
The workpiece is rotatably supported by the received receiving plate, and the swivel angle and the feed angle of the adjusting wheel are switched to reciprocate one or more times between the grinding wheel and the adjusting wheel by the reciprocating through feed on the receiving plate. A centerless grinding method characterized by grinding a workpiece. 2. A grinding wheel extending in the front-rear direction,
Extend the adjusting wheel and cut off the swivel angle and feed angle of the adjusting wheel.
Adjusting means to change and work pieces in both front and rear directions
The front transport that can be transported and is provided in front of the grinding wheel and adjustment wheel
Can the workpiece be transported in the feeding device and in both front and rear directions?
The grinding wheel and the rear transfer device provided behind the adjustment wheel
Provide one or more round trips between the grinding wheel and the adjustment wheel
It is characterized by grinding the workpiece by reciprocating through feed
Centerless grinding machine. 3. A hollow box in which the adjusting means moves in the left-right direction.
Shape adjustment chassis and adjustment wheel chassis that supports the rotation axis of the adjustment wheel
Equipped with a bar and a clamp cylinder fixed to the adjustment chassis.
The clamp plate fixed to the rod of the clamp cylinder
Any adjustment car can be adjusted by clamping the adjustment car cover with
3. The center according to claim 2, wherein the feed angle is fixed.
Grinding machine. 4. The feed angle of the adjusting wheel according to the feed direction of the workpiece.
The number of drive changes and the swivel angle
Equipped with a computer numerical controller that performs value control
The centerless grinding according to claim 2 or 3, wherein
Board.