JPH07108504B2 - Grinder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grinding machine, and more particularly to a work (position) positioning device for a grinding machine.

(Prior Art) Conventionally, a centerless (centerless) grinder may be used as a grinder when it is difficult to support both ends in the axial direction of the work because the work to be ground is a small item.

For example, in the conventional grinder equipment 12 as shown in FIG. 7 and FIG. 8, the stepped cylindrical work piece 1 arranged in the horizontal direction is driven by an axis line substantially parallel to the axial direction of the work piece 1. The outer periphery of the roller 2 is in contact with and supported by the point P.
The shaft 3 for fixing the drive roller 2 is configured to be accurately rotated by a rolling bearing, a static pressure bearing, a dynamic pressure bearing, or the like (not shown), and its rotational drive source is, for example, an electric motor or the like.

The fixed shoe 4 that contacts the outer periphery of the work 1 at the point Q projects upward in the vertical direction with respect to the grinding machine facility 12, and the upper end 4a thereof supports the work 1 at the point Q. Further, the pressing roller 6 which makes point contact with the outer circumference of the work 1 at the point R is inclined in the axial direction by a predetermined angle as is apparent from FIG. The pressing roller 6 prevents radial movement of the work 1 rotated by frictional contact with the drive roller 2 and
By being provided so as to be inclined, a pushing force is applied to the work 1 in the direction A shown in FIG. And the end of the work 1
1a contacts the positioning pin 8 provided on the extension of the work axis direction at the point S, and the work 1 is prevented from moving in the A direction and positioned. The portion to be ground at the other end 1b of the work 1 is the outer peripheral surface and the end surface of the end 1b, and the outer peripheral surface and the end surface contact the grinding wheel 10 and are ground.

According to this conventional grinding machine, when a counterclockwise rotational force in the direction of arrow B shown in FIG. 8 is applied to the drive roller 2, the work 1 is in line contact with the drive roller 2 at a point P, so that the work shown in FIG. A clockwise rotational force in the direction of arrow C is generated. At this time, the fixed shoe 4 comes into line contact with the work 1 at the point Q, and the work 1 is positioned in the vertical direction while slipping at the point Q. Further, the pressing roller 6 makes point contact with the work 1 at the point R, and a counterclockwise rotational force in the direction D shown in the eighth drawing is applied.
Then, the pressing roller 6 gives a force for moving the work 1 in the direction of arrow A in the seventh figure to the work 1 by the above-mentioned inclination, and A
One end 1a of the work which is going to move in the direction is positioned at the point S by the positioning pin 8. Therefore, work 1
8 is rotated in the direction of arrow C in FIG. 8 and is prevented from moving in the axial direction, the other end 1b of the work 1 is a grinding wheel.
With 10, the outer peripheral surface and the end surface of the other end 1b are ground with high precision.

(Problems to be solved by the invention) However, according to this conventional grinding machine, when the outer peripheral surface and the end surface of both ends of the end 1a and the end 1b of the work 1 are ground, the same side as the positioning pin 8 is used. If the grinding wheel is placed at the position 14 shown by the imaginary line in FIG. 7, the positioning pin 8 and the grinding wheel 14 interfere with each other. Since the work cannot be performed, a complicated process of rearranging the work 1 from the position state of the work 1 shown in FIG. 7 to the position state of the work 1 shown in FIG. 9 and performing the grinding work must be performed. There was a problem that it had to be.

The present invention has been made to solve such a problem, and when grinding both ends of a work, the step of rearranging the work on the grinder is omitted, and the orientation and position of the work are not changed. It is an object of the present invention to provide a grinder in which both ends are accurately positioned and grinding can be performed by a quick and simple work process.

(Means for Solving the Problems) Therefore, the grinding machine of the present invention is connected to a rotary drive source and has a drive roller that supports a first point on the outer circumference of a work and a fixed shoe that supports a second point on the outer circumference of the work. A pressing roller that is inclined with respect to the axis of the drive roller, supports the third point on the outer circumference of the work, and applies axial pressing force to the work, and is provided on an extension line of both ends of the work in the axial direction. A first positioning pin and a second positioning pin that can move in the axial direction of the work while receiving the axial pressing force of the first grinding wheel, and a first grinding wheel and a second grinding wheel that are movably provided at both ends of the work in the axial direction. And a grinding wheel, wherein the work is positioned by the first positioning pin, and the first grinding wheel is brought into contact with an end of the work opposite to the first positioning pin to move the work. After grinding the end,
It is characterized in that the work is positioned by the second positioning pin, and the end of the work is ground by bringing the second grinding wheel into contact with the end of the work opposite to the second positioning pin.

(Operation) When both ends of the work are ground, when the axial direction of the work is positioned by the first positioning pin, the work is ground by the first grinding wheel, and then the other end of the work is ground,
After releasing the set of the first positioning pin and the first grinding wheel and supporting the work on the fixed shoe, the second positioning pin positions the work and the other end of the work is moved by the second grinding wheel. Grind. Therefore, both ends of the work can be ground by a simple operation by switching the positioning pin and the grinding wheel without changing the orientation and position of the work.

(Example) Hereinafter, the Example of this invention is described based on drawing.

As shown in FIGS. 1 and 2, a shaft 21 driven by an electric motor (not shown) is horizontally provided in the grinder device 22, and the drive roller 20 is fixed to the tip of the shaft 21. The drive roller 20 is supported via a shaft 21 so as to be accurately rotated by, for example, a rolling bearing, a static pressure bearing, a dynamic pressure bearing, or the like (not shown).

An upper end 23a of the fixed shoe 23 provided vertically below the work 1 is made of cemented carbide, and supports the work 1 in sliding contact at a point Q. The pressing roller 24, which makes point contact at the point R on the outer circumference of the work 1, is swingable around a fulcrum G, and the drive roller 20 and the fixed shoe 2 are provided.
On the other hand, the work 1 is pressed at points P and Q. This pressing roller prevents the work 1 from moving in the radial direction. As a result, the outer peripheral surface of the work 1 is supported at three points at the three points P, Q, and R.

Further, the pressing roller 24 is tilted by a predetermined angle in the roller axial direction as is apparent from FIG. As a result, when the pressing roller 24 rotates in the direction of the arrow shown in FIG. 1 or 2, pressing force is applied to the work 1 in the direction A shown in FIG. 1, and conversely the pressing roller 24 rotates in the opposite direction. Then, the pressing force is applied to the work 1 in the direction opposite to the direction A shown in FIG.

The first positioning pin 26 and the second positioning pin 27 are individually mounted on the extension lines of both ends of the work 1 in the axial direction so as to be slidable in the axial direction. These first positioning pin 26 or second positioning pin
The pressing force is received by 27, and the work 1 is axially positioned.

Further, a first grinding wheel 30 and a second grinding wheel 31 that are movable to the positions extending from both ends of the work 1 to the end 1a on the small diameter side and the end 1b on the large diameter side of the work 1 are respectively provided. It is provided on both sides of the pressing roller 24 individually and independently.

Next, the operation of the grinding machine of this embodiment will be described.

As shown in FIG. 3 and FIG.
When a counterclockwise rotating force is applied in the figure, the drive roller
The work 1 in contact with 20 is rotated clockwise and is supported by the upper end 23a of the fixed shoe 23 at point Q to make a sliding contact. At this time, the presser roller 24 presses the work 1 at the R point to position the work 1 in the radial direction, and at the same time, a counterclockwise rotational force is applied to the presser roller 24 from the work 1 via the R point as shown in FIG. Then, the reaction force is applied to the work 1 in the direction of the arrow A shown in FIG. Then, the work 1 to which this pushing force is applied is the first positioning pin 26.
And is prevented from moving in the axial direction.

Then, as shown in FIG. 3, when the first grinding wheel 30 comes into contact with the outer peripheral surface and the end surface of the end portion 1b on the large diameter side of the work 1,
Grinding of the outer peripheral surface and the end surface of the end portion 1b of the work 1 is started.

When the grinding of the end portion 1b on the large diameter side of the work 1 is completed, the first grinding wheel 30 is moved in the direction of the arrow E in the third illustration, and the work 1 and the first grinding wheel 30 are separated. Next, the drive roller 20 is stopped, the second positioning pin 27 shown in FIG. 5 is brought into contact with the end face of the end portion 1b on the large diameter side of the work 1, and then the first positioning pin 26 shown in FIG. 3 Move in the direction of the arrow A in the figure to move from the small diameter end 1a of the work 1
Separate 26. Then, as shown in FIG.
Rotate 20 clockwise. Then, in FIG. 6, the work 1 is applied with a rotational force in the counterclockwise direction, and the presser roller 24 is applied with a rotational force in the clockwise direction. The output acts, and the end portion 1b on the large diameter side of the work 1 is pressed against the second positioning pin 27. As a result, the work 1 is positioned in the axial direction and accurately rotates counterclockwise.

Then, the second grinding wheel 31 is moved to the work 1 as shown in the fifth.
When the end 1a on the small diameter side is contacted, grinding of the outer peripheral surface and the end surface of the end 1a on the small diameter side of the work 1 is started.

After that, when the grinding of the end portion 1a on the small diameter side of the work 1 is finished, the second grinding wheel 31 pulls in the direction of the arrow H shown in the fifth drawing, the rotation of the drive roller 20 is stopped, and the pressing roller 24 is moved to the sixth position.
By swinging around the point G shown in the figure to release the support at the point R of the work 1, the work 1 is taken out from the grinding device 22,
It is transported to a predetermined place by a belt conveyor (not shown).

As described above, in this embodiment, after the work 1 is arranged in the horizontal direction of the grinder device 22, the first positioning pin 26 and the first positioning pin 26
Grinding wheel 30 for grinding the large-diameter side end 1b of work 1 and then without turning over the orientation and position of work 1 second positioning pin 27 and second grinding wheel
The end 1a of the work 1 on the opposite side is ground by 31. Therefore, since one end and the other end of the work 1 are sequentially ground without removing the work 1 from the grinder device 22, it is possible to easily grind both ends of the work and finish the grinding in a short time.

Further, in the present embodiment, by providing the pressing roller 24, the work 1 can be prevented from jumping out, and at the same time, the forward and reverse rotation of the work 1 can be switched at high speed. This is because, if the pressing roller 24 is not provided, the work 1 is supported by the drive roller 20 and the fixed shoe 23 at two points, so that the work 1 may fly out.

Further, in the present embodiment, the work roller 1 is supported by the pressing roller 24, the driving roller 20, and the fixed shoe 23 at three points instead of at two points, so that the rotating members such as the driving roller 20 and the pressing roller 24 can be downsized. Since the total moment of inertia of the rotating member becomes small, when the grinding of one end of the work 1 is switched to the grinding of the other end, the driving roller 20 and the pressing roller 24 are shortly switched from the normal rotation to the reverse rotation. Since it can be done in time, the processing time required for grinding both end faces of the work can be considerably shortened.

(Effects of the Invention) As described above, according to the grinding machine of the present invention, when both ends of a work are ground, the work is accurately positioned in the radial direction and the axial direction by a single grinding machine, and the positioned work is machined. By changing the positioning pin and grinding wheel in the workpiece axis direction without changing the orientation and position of
There is an effect that both ends of the work can be quickly and accurately ground by a simple operation.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic structure of a grinder according to an embodiment of the present invention, FIG. 2 is a side view of the grinder shown in FIG. 1 as viewed in the direction of arrow II, and FIG. 3 shows an operating process of the grinder. Fig. 4 is a plan view for explaining, Fig. 4 is a side view taken along the arrow IV shown in Fig. 3, Fig. 5 is a plan view for explaining other operation steps of the grinder, and Fig. 6 is shown in Fig. 5. VI side view, arrow FIG. 7 is a plan view showing a conventional grinder, FIG. 8 is a side view taken along arrow XIII shown in FIG. 7, and FIG. 9 is a plane for explaining the operation of the conventional grinder. It is a figure. 1 …… Workpiece, 20 …… Drive roller, 23 …… Fixed shoe, 24 …… Pressing roller, 26 …… First positioning pin, 27 …… Second positioning pin, 30 …… First grinding wheel, 31 …… Second grinding wheel.

Claims (1)

[Claims] 1. A first outer periphery of a work, which is connected to a rotary drive source.
A driving roller for supporting the point, a fixed shoe for supporting the second point on the outer circumference of the work, and an inclination with respect to the axis line of the driving roller, for supporting the third point on the outer circumference of the work and applying an axial pressing force to the work. A pressing roller, a first positioning pin and a second positioning pin that are provided on extension lines of both ends of the workpiece in the axial direction and that are movable in the axial direction of the workpiece while receiving the pressing force in the axial direction of the workpiece; A first grinding whetstone and a second grinding whetstone that are respectively movably provided at both ends in the axial direction are provided, the work is positioned by the first positioning pin, and the work is positioned at the end of the work opposite to the first positioning pin. After contacting the first grinding wheel to grind the end portion of the work,
The work is positioned by the second positioning pin at a position facing the position of the first positioning pin,
A grinding machine, characterized in that the second grinding wheel is brought into contact with the end of the work opposite to the positioning pin to grind the end of the work.