JP3074219B2 - Wheel dressing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dressing apparatus for a grindstone having a self-diagnosis function against a failure or the like.

[0002]

2. Description of the Related Art When shaping the surface of a grindstone for grinding a workpiece, a rotary dressing apparatus is used. This rotary dressing device is generally one in which a dresser tool having a cutting blade such as diamond is attached to an end of a dresser shaft rotatably supported in a housing, and while rotating the dresser shaft, The surface of the grindstone is shaped by bringing the dresser tool into contact with the rotating grindstone. In this case, in order to increase the utilization efficiency of the grindstone, it is required to form a required ground surface with as little contact shaving allowance as possible between the grindstone and the dresser tool.

Heretofore, such contact between the rotating dresser tool and the grindstone has been detected by an operator's ear sensing a sound generated when the two come into contact with each other. However, such sensory detection has low detection accuracy and involves human error, so that the allowance for grinding the grinding wheel is increased, the utilization efficiency of the grinding wheel is reduced, and the grinding cost is increased.

In order to solve such a problem, there has been proposed a dressing apparatus which detects an ultrasonic vibration generated when a dresser tool comes into contact with a grindstone with an ultrasonic sensor and thereby reduces a cutting allowance (particularly). Fair 1-23273
No.).

In this dressing apparatus, a cutting fluid as a detection fluid is supplied to a gap between the rotating dresser tool and the housing to form a liquid film, and an ultrasonic vibration generated when the dresser tool comes into contact with the grinding wheel is generated. It is transmitted to an ultrasonic sensor via a liquid film and a housing to detect a contact point in micron units.

[0006]

In a dressing apparatus provided with an ultrasonic sensor as described above, a periodical operation is performed to prevent a detection error of the contact point due to a decrease in the sensitivity of the ultrasonic sensor or a disconnection. It is necessary to conduct a sensitivity test of the ultrasonic sensor.

As a sensitivity test of the ultrasonic sensor, there is a method in which vibration is forcibly applied to the ultrasonic sensor, and the generated ultrasonic wave is detected and determined by a monitoring device. As a method of forcibly applying vibration to the ultrasonic sensor, there are known methods such as a steel ball drop method and a shot blast method. However,
The above method has a problem that it is not practical because it is necessary to remove the ultrasonic sensor from the dressing device.

The present invention has been made in view of the above circumstances, and provides a dressing apparatus having a self-diagnosis function capable of easily performing a sensitivity test of an ultrasonic sensor at a use site of the dressing apparatus. The purpose is to do.

[0009]

To achieve the above object, the present invention provides a housing, a dresser shaft rotatably supported by the housing, and a detachably mounted end of the dresser shaft. In a dressing apparatus including a dresser tool and an ultrasonic sensor disposed in a housing and detecting vibration applied to the dresser tool, the ultrasonic sensor itself or the housing may be provided with an air blow-through hole having a throttle portion. It is characteristic.

[0010]

A blow-through hole having a throttle portion is formed in the ultrasonic sensor itself or the housing. When air is blown into the hole, the action of the throttle portion of the air blow-through hole causes an ultrasonic wave close to the detection frequency of the ultrasonic sensor. Since vibration is generated, by detecting this vibration, it is possible to perform a test for the deterioration of the sensitivity of the ultrasonic sensor and the presence / absence of disconnection without removing the ultrasonic sensor from the dressing device.

[0011]

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

In FIG. 1, a dressing device 1 includes a housing 11, a dresser shaft 21 rotatably supported by the housing 11 via bearings 12, 13, and one end of the dresser shaft 21 protruding from the housing 11. And a dresser tool 31 removably attached to the portion (the right end in the illustrated example).

An inner sleeve 15 and an outer sleeve 16 are interposed between the bearing 12 and the bearing 13 in the housing 11. The right end of the dresser shaft 21 is sealed by a seal member 23, and the left end of the dresser shaft 21 is pressed by a nut 25 screwed to the dresser shaft 21.

A hole 40 is provided in the housing 11 in parallel with the dresser shaft 21 from the left end side.
Grease is applied to the inner end surface 40a of the “0”. The ultrasonic sensor 50 is housed so as to be pressed against the detection surface (right end surface) of the inner end surface 40a. A spring 55 through which the conducting wire 51 penetrates is accommodated on the left side of the hole 40, and is closed by the screw stopper 41.

A dresser tool 31 having a cutting edge 32 is fitted to the right end of the dresser shaft 21.
Abuts on the flange 22 of the dresser shaft 21 and is screwed to the right end of the dresser shaft 21 via a nut 33.
A detection liquid is supplied to a gap formed between the dresser tool 31 and the housing 11 from a detection liquid supply source (not shown). A pulley 35 is mounted on the left end of the dresser shaft 21. The pulley 35 is connected to a pulley mounted on a drive shaft of a power source (not shown) via a V-belt.

In this embodiment, the air blow-through hole 60 is provided near the housing 11 in which the ultrasonic sensor 50 is housed. As shown in FIG. 2, the air blow-through hole 60 is provided between the air introduction portion 61 and the air discharge portion 6 communicating with the air introduction portion 61 through the throttle portion 62.
3 and a throttle / air discharge unit 64.

Next, the operation of this embodiment will be described.

In FIG. 1, when the grindstone 100 indicated by an imaginary line is worn and needs to be shaped, the entire dressing apparatus 1 is sent out to the grindstone side while the grindstone is rotated. In this state, the dresser tool 31 is naturally rotated.

Next, when the cutting blade 32 of the rotating dresser tool 31 comes into contact with the peripheral surface of the grindstone 100, the cutting blade 32 starts grinding the surface of the grindstone 100. From that point, the feed of the entire dressing apparatus 1 is started. Strictly control dimensions. Thereby, the grinding amount of the peripheral surface of the grindstone 100 is managed.

That is, the ultrasonic vibration generated in the dresser tool 31 by the impact at the moment of contact with the grindstone is transmitted to the ultrasonic sensor 50 through the liquid film of the detection liquid formed as described above and the housing 11, The detection signal of the ultrasonic sensor 50 is sent to an electric control device (not shown) through the conducting wire 51, and the signal from the electric control device determines the dressing start point of the grinding stone.

In this embodiment, the ultrasonic sensor 5
In order to prevent the detection error of the contact point due to the sensitivity drop of 0 or the disconnection or the like, the sensitivity test of the ultrasonic sensor is periodically performed.

In this case, the air inlet 61 of the air blow-through hole 60 and an air source (not shown) are connected by a pipe.
Air having a predetermined pressure is sent into the air blow-through hole 60. As a result, the supplied air flows from the air introduction section 61 to the air discharge section 63 and from the air discharge section 63 to the throttle / air discharge section 64. At this time, the throttle section 62, the throttle / air discharge section 64 The vibration of the ultrasonic wave close to the resonance frequency of the ultrasonic sensor 50 is generated by the action of (1). Therefore, the test of the ultrasonic sensor 50 can be easily performed by using this vibration.

According to this, the ultrasonic sensor 50 can be removed from the dressing apparatus 1 by simply passing air through the air vent hole 60 during the test.
Can be tested for sensitivity degradation and disconnection.

The air passing through the air blow-through hole 60 may be about 5 kg / cm ^{2 at} a factory or the like. The shape and size of the throttle portion 62 of the air blow-through hole 60 can be set as appropriate, but it is preferable to cut a tap on the wall surface of the vertical hole such as the air introduction portion 61 or the air discharge portion 63. By cutting the tap there, the frequency of vibration by air can be made higher.

3 to 5 show another embodiment.

As shown in FIG. 3, a throttle screw 65 is inserted into the air discharge portion 63 of the blow-through hole 60 to discharge air only from the throttle and air discharge portion 64 or the throttle and air discharge portion 6.
The air may be discharged only from the air discharging portion 63 by inserting the stopper 66 into the plug 4.

FIG. 4 is a view showing another embodiment of the blow-through hole 60. The blow-through hole 60 communicates with the air introducing portion 61 so as to form an L-shape through the throttle portion 62 with the air introducing portion 61. And an air discharge portion 63.

FIG. 5 shows an example in which a through hole 72 is provided in a connecting member 70 of a conducting wire 51 connected to the left end of the ultrasonic sensor 50.

The connecting member 70 has a base 71 fixed to the ultrasonic sensor 50, and a blow-through hole 72 formed in the base 71, and connects the blow-through hole 72 and an air supply source (not shown). The connecting pipe 79 is connected via a connecting portion 78. The blow-through hole 72 includes an air inlet 73, an air outlet 75 communicating with the air inlet 73 through a throttle 74, and a throttle / air outlet 76.

The air inlet 73 of the blow-through hole 72
When air having a predetermined pressure is supplied to the ultrasonic sensor 50 through the pipe 79, the vibration of the ultrasonic wave close to the resonance frequency of the ultrasonic sensor 50 is generated by the action of the throttle portion 74 and the throttle and air discharging portion 76.

Although the present invention has been described using one embodiment, it is apparent that the present invention is not limited to this. For example, the air blow-through holes that constitute the main part of the present invention are not limited to holes that bend in the middle,
A hole extending straight may be used as long as it has a throttle portion.

[0032]

As described in detail above, according to the present invention,
Ultrasonic vibration can be generated by blowing air into the blow-through hole with the constricted portion, making it easy and easy to test the ultrasonic sensor for deterioration in sensitivity, disconnection, etc. without removing the ultrasonic sensor from the dressing device. Since it can be performed at low cost, the reliability of the dressing device can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a dressing device according to the present invention.

FIG. 2 is an enlarged sectional view of an air blow-through hole.

FIG. 3 is a view showing another embodiment of the air blow-through hole.

FIG. 4 is a view showing another embodiment of the air blow-through hole.

FIG. 5 is a cross-sectional view showing an embodiment of an air blow-through hole provided at an end of the ultrasonic sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dressing device 11 Housing 21 Dresser shaft 31 Dresser tool 31 60, 72 Air blow-through hole 62, 74 Restricted portion

Continuation of the front page (56) References JP-A-3-26463 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24B 53/00 G01H 1/00 G01H 17/00

Claims (1)

(57) [Claims] 1. A housing, a dresser shaft rotatably supported by the housing, a dresser tool removably mounted at an end of the dresser shaft, and vibration applied to the dresser tool disposed in the housing. In the dressing device of a grindstone provided with an ultrasonic sensor that detects
An air blow-through hole having a throttle portion is provided in the ultrasonic sensor itself or the housing.