JP7417281B2 - centerless grinding machine - Google Patents

Description

The present invention relates to a centerless grinder that grinds a workpiece while rotatably supporting it through contact with three members: a grinding wheel, an adjusting wheel, and a blade, without supporting the workpiece at the center.

The present applicant has proposed a centerless grinding machine in which the workpiece to be machined (workpiece) can be changed and the position of the adjusting wheelhead or grinding wheelhead can be automatically set according to the change in diameter (for example, , see Patent Document 1).

The centerless grinder described in Patent Document 1 includes a blade disposed between a grinding wheel and an adjusting wheel, and an external force applying mechanism that presses the workpiece from above to apply an external force to the workpiece. When the external force acting on the blade decreases in the process of narrowing the distance between the grinding wheel and the adjustment wheel, it is detected that the grinding wheel has contacted the workpiece, and this position is taken as the original position of the grinding wheel.

Patent No. 6408512

However, the centerless grinding method described in Patent Document 1 is provided with an external force applying mechanism that presses the workpiece from above to apply an external force to the workpiece, which increases the number of parts and requires time and effort to position the external force applying mechanism. There was a problem that it took a while.

The present invention has been made in view of this background, and provides a centerless grinding machine that can automatically adjust the positional relationship of a grinding wheel, a blade, and an adjusting wheel with high precision without using a pressing mechanism that presses a workpiece from above. The purpose is to

[1] The centerless grinder of the present invention includes a cylindrical grinding wheel for grinding a workpiece,
A cylindrical adjustment grindstone,
a blade disposed between the grinding wheel and the adjusting wheel;
an actuator that moves at least one of the adjusting whetstone, the blade, and the grinding whetstone so as to adjust the distance between the grinding whetstone and the adjusting whetstone;
an adjustment grindstone drive mechanism that rotates the adjustment grindstone around an axis;
a control device that controls operations of the actuator and the adjustment grindstone drive mechanism;
A centerless grinding machine comprising:
an external force sensor that outputs a signal according to an external force acting on the blade,
The control device includes:
controlling the operation of the actuator so that the distance between the grinding wheel and the workpiece is narrowed from a state in which the workpiece is supported by the sloped surface that is the upper surface of the blade and the outer peripheral surface of the adjustment grindstone;
In the process of narrowing the distance between the grinding wheel and the workpiece, the adjusting wheel drive mechanism rotates the adjusting wheel in a counterclockwise direction opposite to the rotation direction during machining, thereby increasing the distance between the grinding wheel and the workpiece. Due to the contact with the workpiece, the grinding wheel is given a rotational movement in a counterclockwise direction via the workpiece, and a force is applied from the workpiece to the blade as a reaction to the force at that time, so that the output of the external force sensor changes. The present invention is characterized in that the contact between the grinding wheel and the workpiece is detected and the operation of the actuator is controlled if the determination result is positive.
Note that the clockwise direction, which is the rotation direction of the adjustment whetstone during processing, is the clockwise direction when the adjustment whetstone is placed on the right side of the grinding wheel. In other words, even if the adjustment wheel is placed on the left side of the grinding wheel and rotates counterclockwise during processing, when viewed from the opposite side, the adjustment wheel is placed on the right side of the grinding wheel and the adjustment wheel rotates counterclockwise during processing. At the same time, the adjustment grindstone rotates clockwise, showing the same configuration. Moreover, the above-mentioned cylindrical shape may be any shape in which at least the outer peripheral portion is columnar, and includes, for example, a shape in which the central portion is recessed.

According to the present invention, the operation of the actuator is controlled when the output of the external force acting on the blade (or the output signal of the external force sensor) changes while the workpiece is in contact with the blade. Considering that the external force acting on the blade changes depending on the manner of contact between the workpiece and the grinding wheel, the positional relationship between the grinding wheel, the blade, and the adjusting wheel can be automatically adjusted with high precision. Thereby, work safety can be ensured without the worker coming into contact with the tool.

In addition, by rotating the adjustment wheel counterclockwise, which is the opposite direction to the rotation direction (clockwise) during processing, the grinding wheel rotates counterclockwise through the workpiece due to contact between the grinding wheel and the workpiece. In other words, at the point of contact between the grinding wheel and the workpiece, the grinding wheel receives a tangentially upward force, and as a reaction to that force, a tangentially downward force is applied to the workpiece, and this force acts on the blade. Due to this action, force can be applied to the blade even if the workpiece is lightweight without using a pressing mechanism that presses the workpiece from above, and it is possible to easily detect that the grinding wheel has contacted the workpiece. .

Here, when adjusting the distance between the grinding wheel and the workpiece, the conventional method contacts the grinding wheel without rotating the workpiece, but for workpieces with uneven peripheral surfaces, the grinding wheel is moved closer to the workpiece. Sometimes, when the deepest recessed part of the workpiece comes into contact with the grinding wheel first, the workpiece is detected as a pseudo perfect circle with this position as the outer peripheral surface. In this case, this position becomes the grinding start position in the radial direction of the workpiece. For this reason, if the workpiece is rotated with the deepest concave part of the workpiece as the radial grinding start position, the convex part of the workpiece will be ground at once, which may place a large load on the grinding wheel and cause damage. .

According to the present invention, during adjustment, the adjustment grindstone is rotated in a counterclockwise direction, which is opposite to the rotation direction (clockwise) during machining, so that the workpiece can be rotated clockwise, and unevenness on the circumferential surface can be avoided. For some workpieces, when the grinding wheel is brought close to the workpiece, the most protruding convex portion of the workpiece contacts the grinding wheel first. In this case, the workpiece is detected as a pseudo perfect circle with the most protruding convex portion as the outer peripheral surface. As a result, the workpiece can be cut using this pseudo-perfect circular outer circumferential surface as a reference (cutting start position), and the convex parts of the workpiece can be gradually ground, so there is no need to place a large load on the grinding wheel. It is possible to suppress damage to the grinding wheel.

[2] The centerless grinder of the present invention includes a cylindrical grinding wheel for grinding a workpiece,
A cylindrical adjustment grindstone,
a blade disposed between the grinding wheel and the adjusting wheel;
an actuator that moves at least one of the adjustment whetstone, the blade, and the grinding whetstone;
a grinding wheel drive mechanism that rotates the grinding wheel around an axis;
a control device that controls operations of the actuator and the grinding wheel drive mechanism;
A centerless grinding machine comprising:
an external force sensor that outputs a signal according to an external force acting on the blade,
The control device includes:
controlling the operation of the actuator so that the distance between the grinding wheel and the workpiece is narrowed from a state in which the workpiece is supported by the sloped surface that is the upper surface of the blade and the outer peripheral surface of the adjustment grindstone;
In the process of narrowing the distance between the grinding wheel and the workpiece, the adjusting wheel is not rotated, and the grinding wheel drive mechanism rotates the grinding wheel in the same clockwise direction as during machining, thereby making contact with the workpiece. determines whether the output of the external force sensor has changed due to force acting on the blade via the workpiece, and, with the requirement that the determination result is positive, the grinding wheel and the workpiece The actuator is characterized by detecting contact with the actuator and controlling the operation of the actuator.

According to the present invention, the operation of the actuator is controlled when the output of the external force acting on the blade (or the output signal of the external force sensor) changes while the workpiece is in contact with the blade. Considering that the external force acting on the blade changes depending on the contact state between the workpiece and the grinding wheel or the grinding wheel and adjusting wheel, the positional relationship between the grinding wheel, the blade, and the adjusting wheel can be automatically adjusted with high precision. .

In addition, the adjustment whetstone was not rotated, but the grinding wheel was rotated in the same clockwise direction as during processing, and the output of the external force sensor changed due to force acting on the blade through the workpiece due to contact with the workpiece. Therefore, the force applied from the workpiece to the blade can be changed without using a pressing mechanism that presses the workpiece from above, and it is possible to easily detect that the grinding wheel has contacted the workpiece.

[3] It is preferable that the axis of the adjustment whetstone is located below the axis of the grinding whetstone.

According to this configuration, compared to a case where the axis of the adjustment wheel and the axis of the grinding wheel are parallel, the force of the work toward the adjustment wheel due to gravity increases. Thereby, when the rotational force of the adjustment grindstone is transmitted to the workpiece during adjustment, the transmitted force can be increased.

[4] The control device controls the operation of the actuator so that the distance between the grinding wheel and the adjusting wheel is increased to a predetermined value and then stopped, with the requirement that the determination result is positive. It is preferable that the stop position is memorized and held as the original position of the grinding wheel.

According to this configuration, the original position of the grinding wheel can be easily detected.

[5] It is preferable that the control device controls the operation of the actuator so that the approach speed of the grinding wheel and the adjusting wheel is reduced, with the requirement that the determination result is positive.

According to this configuration, the approach speed (relative approach speed) between the grinding wheel and the adjustment wheel is reduced when the grinding wheel comes into contact with the workpiece, so the idle time of the grinding wheel is shortened. The time required for grinding the workpiece can be reduced.

FIG. 1 is a configuration explanatory diagram of a centerless grinder as an embodiment of the present invention. A configuration diagram showing an adjustment whetstone, a grinding wheel, a workpiece, and a blade of a centerless grinder during adjustment. FIG. 2 is a configuration diagram showing an adjustment whetstone, a grinding wheel, a workpiece, and a blade of a centerless grinder in a state where the grinding wheel is in contact with a workpiece. FIG. 7 is a configuration explanatory diagram of a centerless grinder according to a third embodiment of the present invention. FIG. 4 is a configuration explanatory diagram of a centerless grinder according to a fourth embodiment of the present invention. FIG. 7 is a configuration explanatory diagram of main parts of a centerless grinder according to a fifth embodiment of the present invention. FIG. 7 is an explanatory diagram of the configuration of main parts of a centerless grinder according to a sixth embodiment of the present invention. FIG. 7 is a configuration explanatory diagram of main parts of a centerless grinder according to a seventh embodiment of the present invention.

[First embodiment]
(Configuration of centerless grinder)
The centerless grinding machine as an embodiment of the present invention shown in FIG. , is equipped with.

The adjusting whetstone 1 has a substantially cylindrical shape, and is supported by an adjusting whetstone drive mechanism 21 so as to be rotatable around an axis O1 (an axis parallel to the Z-axis). The adjustment grindstone 1, the blade 4, and the work rest 6 are supported on a base 11 so as to be able to reciprocate in the horizontal direction (±X direction (further ±Z direction if necessary)) or along a surface inclined with respect to the horizontal plane. has been done. The base 11 is mounted on the bed and is driven by the first actuator 41. An adjustment grindstone dressing device for dressing the outer peripheral surface of the adjustment grindstone 1 may be provided in the vicinity of the adjustment grindstone 1.

The grinding wheel 2 has a substantially cylindrical shape, is arranged so that its outer circumferential surface faces the outer circumferential surface of the adjustment grindstone 1, and is rotated around an axis O2 (an axis parallel to the Z axis) by a grinding wheel drive mechanism 22. Possibly supported. The grinding wheel 2 is supported by a grinding wheel slider 12 mounted on a bed so that it can be reciprocated, for example, in the horizontal direction (±X direction (and further in the ±Z direction if necessary)) or along a surface inclined with respect to the horizontal plane. has been done. Grinding wheel slider 12 is driven by second actuator 42 . A grinding wheel dressing device for dressing the outer peripheral surface of the grinding wheel 2 may be provided in the vicinity of the grinding wheel 2.

By supplying the workpiece W between the adjustment whetstone 1 and the grinding whetstone 2, the three contact points between the workpiece W and each of the adjustment whetstone 1, the grinding whetstone 2, and the blade 4 are appropriately positioned, and the adjustment whetstone 1 or the grinding whetstone 2 in the radial direction of the workpiece W, a desired grinding result is achieved. A line segment L connecting the center of the adjustment grindstone 1 (axis O1) and the center of the grinding wheel 2 (axis O2) in the XY plane is parallel to the X axis, and the center Ow of the workpiece W is above the line segment L. Located in

The blade 4 is arranged between the adjusting grindstone 1 and the grinding wheel 2. The blade 4 is fixed to a work rest 6 mounted on the bed. The work rest 6 is provided with an external force sensor 8 that outputs a signal according to the external force acting on the blade 4 (or the amount of strain on the work rest 6). The external force sensor 8 is configured by, for example, a strain gauge.

The control device 20 is configured by a computer (comprised of a CPU (arithmetic processing unit), a memory (storage device) such as ROM or RAM, an input/output I/F circuit, etc.). The control device 20 controls the operations of the adjusting grindstone drive mechanism 21, the grinding wheel drive mechanism 22, the first actuator 41, and the second actuator 42.

(Control method for centerless grinding machine (setting the original position of the grinding wheel))
By manually moving the adjustment whetstone 1, blade 4, and work rest 6 in the +X direction or -X direction, the distance between the adjustment whetstone 1 and blade 4 and the grinding wheel 2 in the X direction can be adjusted according to the diameter of the workpiece W. adjusted.

As shown in FIG. 2A, during the adjustment, the adjustment grindstone drive mechanism 21 rotates the adjustment grindstone 1 counterclockwise around the axis. As a result, the workpiece W is rotated or rotated clockwise around the axis Ow.

When the base 11 or the grinding wheel slider 12 is moved and the grinding wheel 2 comes into contact with the outer peripheral surface of the workpiece W as shown in FIG. 2B, the grinding wheel 2 is moved through the workpiece W due to the contact between the grinding wheel 2 and the workpiece W. A rotational movement is forcibly applied in the counterclockwise direction, and a force acts on the blade 4 from the workpiece W as a reaction to the force at that time (external force acting on the blade 4 increases). Thereby, force can be applied from the workpiece W to the blade 4 without using a pressing mechanism that presses the workpiece W from above, and it is possible to easily detect that the grinding wheel 2 has contacted the workpiece W.

(Control method of centerless grinder (grinding of workpiece))
The control device 20 controls the operation of the first actuator 41 from a state where the workpiece W is supported by the adjustment grindstone 1 rotated clockwise and the blade 4, but is separated from the grinding wheel 2. By doing this, the base 11 is moved in the −X direction at the reference speed, or by controlling the operation of the second actuator 42, the grinding wheel slider 12 is driven forward in the +X direction at the reference speed. That is, the relative approaching speed between the grinding wheel 2 and the workpiece W is controlled to the reference speed. As a result, the distance between the grinding wheel 2 and the workpiece W is controlled to be gradually narrowed. In this process, it is determined whether the external force acting on the blade 4 represented by the output signal of the external force sensor 8 has increased or has increased beyond a threshold value set in the control device 20 in advance.

If the determination result is negative, the grinding wheel 2 and the workpiece W are driven forward at a reference speed. On the other hand, if the determination result is positive, the control device 20 controls the operation of the first actuator 41 to control the movement speed at which the base 11 can be moved in the -X direction, or the operation of the second actuator 42. By controlling this, the speed at which the grinding wheel slider 12 is moved in the +X direction is reduced, and the speed at which the grinding wheel 2 and the workpiece W approach is reduced. As a result, the relative approaching speed is reduced when the grinding wheel 2 comes into contact with the workpiece W, so the idle time of the grinding wheel is shortened, and the time required for grinding the workpiece W is shortened. .

The respective operations of the adjustment whetstone drive mechanism 21 and the grinding whetstone drive mechanism 22 are controlled so that the adjustment whetstone 1 rotates clockwise around the axis O1, and the grinding wheel 2 rotates clockwise around the axis O2. Ru. In this process, while the workpiece W rotates counterclockwise around the axis Ow, grinding is performed from the outer periphery at the approaching speed of the grinding wheel 2 and the workpiece W, which is decelerated upon contact with the workpiece W as described above. Or notched. Detecting the contact between the grinding wheel 2 and the workpiece W in this way also brings about the advantage of shortening the machining time.

In the process of detecting the contact between the workpiece W and the grinding wheel 2, in the conventional method in which the workpiece W is brought into contact with the grinding wheel 2 without rotating the workpiece W, when the workpiece W has an uneven circumferential surface, the most concave part of the workpiece W is detected. When the recess first contacts the grinding wheel 2, it is detected as a perfect circle with this position as the outer peripheral surface, and this position becomes the radial grinding start position of the workpiece W. For this reason, when the workpiece is rotated with the deepest concave part of the workpiece as the grinding start position, the convex part of the workpiece will be ground at once, and a large load may be applied to the grinding wheel 2, causing damage.

On the other hand, in the present invention, in the process of detecting the contact between the workpiece W and the grinding wheel 2, by rotating the adjusting grindstone 1 counterclockwise around the axis O1, the workpiece W is rotated clockwise around the axis Ow. Therefore, in the workpiece W having an uneven circumferential surface, it is possible to create a pseudo perfect circle with the most protruding convex portion as the outer circumferential surface. As a result, the workpiece W can be cut using this pseudo-perfect circular outer peripheral surface as a reference (grinding start position), and the convex parts of the workpiece W can be gradually ground, so a large load is placed on the grinding wheel 2. This can prevent the grinding wheel 2 from being damaged.

(Other embodiments of the present invention: second embodiment)
In the embodiment described above, in the process of detecting the contact between the workpiece W and the grinding wheel 2, the adjustment grindstone 1 is rotated counterclockwise around the axis O1, but the contact between the workpiece W and the grinding wheel 2 is detected. During the process, the adjusting whetstone 1 may not be rotated, but the grinding whetstone 2 may be rotated in the same clockwise direction as during processing.

In this second embodiment, when the grinding wheel 2 comes into contact with the workpiece W while the adjustment wheel 1 is not rotated and the grinding wheel 2 is rotated in the same clockwise direction as during processing, the blade 4 passes through the workpiece W. Due to the force acting, the determination result of whether or not the output of the external force sensor 8 has changed becomes affirmative. In this case, contact between the grinding wheel 2 and the workpiece W is detected, and thereafter the same control as in the first embodiment is performed. In this case, the circumferential speed of the grinding wheel 2 is preferably small, for example, preferably 0.1 to 1.0 m/s.

(Other embodiments of the present invention: third embodiment)
In the above embodiment, the line segment L connecting the center of the adjustment grindstone 1 (axis O1) and the center of the grinding wheel 2 (axis O2) in the XY plane is parallel to the X axis, but as shown in FIG. The line segment L may be inclined with respect to the X axis. In this case, it is preferable that the center of the adjustment grindstone 1 (axis line O1) is below the center of the grinding wheel 2 (axis line O2), and that the line segment L is inclined by 10° to 30°, for example. is preferred.

In this third embodiment (the line segment L is inclined with respect to the X-axis), the force of the workpiece W toward the adjustment grindstone 1 due to gravity increases compared to the case where the line segment L is parallel (horizontal) to the X-axis. . Thereby, when the rotational force of the adjustment grindstone 1 is transmitted to the workpiece W, the transmitted force is increased, and the workpiece W becomes easier to rotate even before it is brought into contact with the grinding wheel 2.

(Other embodiments of the present invention: Fourth embodiment)
As shown in FIG. 4, a line segment L connecting the center of the adjustment grindstone 1 (axis O1) in the XY plane and the center (axis O2) of the grinding wheel 2 is parallel to the X axis in the XY plane, The center Ow of the workpiece W may be located below the line segment L. In this case as well, the same control as in the above embodiment is performed. Furthermore, in this embodiment, instead of the adjustment control in which the adjustment grindstone 1 of the above embodiment is rotated counterclockwise around the axis O1 and the workpiece W is rotated clockwise around the axis Ow, the adjustment grindstone 1 The adjustment control may be performed by rotating the workpiece W clockwise around the axis O1 and rotating the workpiece W counterclockwise around the axis Ow.

In this fourth embodiment, the center Ow of the workpiece W is located below the line segment L, so the workpiece W can be rotated by rotating the adjustment grindstone 1 regardless of the rotation direction of the adjustment grindstone 1. , force can be applied from the workpiece W to the blade 4.

(Other embodiments of the present invention: Fifth embodiment)
In the above embodiment, the adjustment grindstone 1, the blade 4, and the work rest 6 are mounted on the base 11, but as shown in FIG. 13, and a third actuator (not shown) for driving 13, it may be moved automatically. This fifth embodiment also includes the control device 20, the first actuator 41, and the second actuator 42 of the embodiments described above, and the control device 20 controls the driving of the adjusting grindstone slider 13 and the third actuator.

(Other embodiments of the present invention: 6th embodiment)
In the above embodiment, the adjusting grindstone 1, the blade 4, and the work rest 6 are mounted on the base 11, but as shown in FIG. The adjustment grindstone slider 13 on which only the adjustment grindstone slider 13 is mounted, and a fourth actuator (not shown) for driving the adjustment grindstone slider 13 may be provided, and the adjustment grindstone slider 13 may be moved automatically. The sixth embodiment also includes the control device 20, the first actuator 41, and the second actuator 42 of the embodiment described above, and the control device 20 controls the driving of the adjusting grindstone slider 13 and the fourth actuator.

(Other embodiments of the present invention: 7th embodiment)
In the above embodiment, the adjustment grindstone 1, the blade 4, and the work rest 6 are mounted on the base 11, but as shown in FIG. 7, the blade 4 and the work rest 6 are not fixed to the base 11 or the bed. , a work rest slider 14 on which the work rest 6 is mounted and movable in the Y direction, and a fifth actuator (not shown) for driving the work rest slider 14, and the work rest slider 14 may be moved automatically. . This seventh embodiment also includes the control device 20, the first actuator 41, and the second actuator 42 of the above embodiment, and the control device 20 controls the drive of the work rest slider 14 and the fifth actuator.

In the above embodiment, the grinding wheel 2 comes into contact with the workpiece W, and the external force acting on the blade 4 represented by the output signal of the external force sensor 8 increases or increases beyond a threshold value set in the control device 20 in advance. If the judgment result is affirmative, approach speed reduction control is performed to reduce the approach speed between the grinding wheel 2 and the workpiece W. However, if the judgment result is positive, first, the grinding wheel The grinding wheel 2 may be stopped after increasing the distance between the grinding wheel 2 and the adjusting wheel 1 to a predetermined value, and the stopping position may be stored and held as the original position of the grinding wheel 2. In this case, after the stop, the distance between the grinding wheel 2 and the workpiece W is controlled to be narrowed again, and when the grinding wheel 2 comes into contact with the workpiece W again and the above judgment result is positive, the approaching speed is Decrease control should be performed.

DESCRIPTION OF SYMBOLS 1...Adjustment whetstone, 2...Grinding whetstone, 4...Blade, 6...Work rest, 8...External force sensor, 11...Base, 12...Grinding whetstone slider, 13...Adjustment whetstone slider, 14...Work rest slider, 20...Control Apparatus, 21...adjustment grindstone drive mechanism, 41...first actuator, 42...second actuator, W...work.

Claims (5)

A cylindrical grinding wheel for grinding a workpiece,
A cylindrical adjustment grindstone,
a blade disposed between the grinding wheel and the adjusting wheel;
an actuator that moves at least one of the adjusting whetstone, the blade, and the grinding whetstone so as to adjust the distance between the grinding whetstone and the adjusting whetstone;
an adjustment grindstone drive mechanism that rotates the adjustment grindstone around an axis;
a control device that controls operations of the actuator and the adjustment grindstone drive mechanism;
A centerless grinding machine comprising:
an external force sensor that outputs a signal according to an external force acting on the blade,
The control device includes:
controlling the operation of the actuator so that the distance between the grinding wheel and the workpiece is narrowed from a state in which the workpiece is supported by the sloped surface that is the upper surface of the blade and the outer peripheral surface of the adjustment grindstone;
In the process of narrowing the distance between the grinding wheel and the workpiece, the adjusting wheel drive mechanism rotates the adjusting wheel in a counterclockwise direction opposite to the rotation direction during machining, thereby increasing the distance between the grinding wheel and the workpiece. Due to the contact with the workpiece, the grinding wheel is given a rotational movement in a counterclockwise direction via the workpiece, and a force is applied from the workpiece to the blade as a reaction to the force at that time, so that the output of the external force sensor changes. The centerless grinding machine is characterized in that the contact between the grinding wheel and the workpiece is detected, and the operation of the actuator is controlled, with the requirement that the judgment result is positive. A cylindrical grinding wheel for grinding a workpiece,
A cylindrical adjustment grindstone,
a blade disposed between the grinding wheel and the adjusting wheel;
an actuator that moves at least one of the adjustment whetstone, the blade, and the grinding whetstone;
a grinding wheel drive mechanism that rotates the grinding wheel around an axis;
a control device that controls operations of the actuator and the grinding wheel drive mechanism;
A centerless grinding machine comprising:
an external force sensor that outputs a signal according to an external force acting on the blade,
The control device includes:
controlling the operation of the actuator so that the distance between the grinding wheel and the workpiece is narrowed from a state in which the workpiece is supported by the sloped surface that is the upper surface of the blade and the outer peripheral surface of the adjustment grindstone;
In the process of narrowing the distance between the grinding wheel and the workpiece, the adjusting wheel is not rotated, and the grinding wheel drive mechanism rotates the grinding wheel in the same clockwise direction as during machining, thereby making contact with the workpiece. determines whether the output of the external force sensor changes due to force acting on the blade via the workpiece, and, with the requirement that the determination result is positive, the grinding wheel and the workpiece A centerless grinding machine characterized in that the operation of the actuator is controlled by detecting contact with the actuator. The centerless grinder according to claim 1 or 2,
A centerless grinding machine, characterized in that the axis of the adjustment whetstone is located below the axis of the grinding whetstone. The centerless grinding machine according to any one of claims 1 to 3,
The control device controls the operation of the actuator so as to widen the distance between the grinding wheel and the adjustment wheel to a predetermined value and then stop, with the requirement that the determination result is positive, and A centerless grinding machine characterized in that a position is memorized and held as an original position of the grinding wheel. The centerless grinding machine according to claim 4,
A centerless grinding machine, characterized in that the control device controls the operation of the actuator so that the approach speed of the grinding wheel and the adjusting wheel is reduced, with the requirement that the determination result is positive.

Images