JPH0763935B2 - Dresser and whetstone dressing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dresser and a dressing device for a grindstone capable of performing minute dressing.

[Prior Art] Generally, a grindstone is usually dressed with a single stone diamond dresser, but the purpose of this dressing is to grind and drop the abrasive grains by using a grindstone to shape a rough grindstone surface. , Also sharpened the blunted cutting edge,
Another point is to remove the clogging. Then, as a result of this dressing work, the diameter of the grindstone is reduced by about 0.2 to 0.3 mm and becomes smaller. That is, while dressing improves the sharpness of the grindstone, it shortens the life of the grindstone.

However, since the cost of a general whetstone is as low as several thousand yen, the running cost of the whetstone is more effective in improving sharpness and improving machining accuracy, and is not a problem.

On the other hand, the cost of a CBN wheel grindstone is 40 to 60 times higher than that of a general grindstone, so the running cost of the grindstone becomes a problem. Even if the tip of the cutting edge is finely crushed, however, the blade naturally becomes sharp and is hardly clogged. Therefore, the dressing amount is sufficient to remove the roughened portion of the grindstone tip. Rather, when the dressing amount increases, dressing damage increases, and the tip of the cutting edge becomes blunt, which reduces the grinding performance and the sharpness immediately after dressing.

As described above, in the CBN wheel grindstone including the diamond grindstone, it is necessary to perform dressing (dressing) after truing, but as the tool, a single stone diamond, an impure dresser, a rotary dresser, a block dresser, etc. are used. To properly dress this CBN wheel grindstone, gradually bring the dresser closer to the rotating CBN wheel grindstone, measure the vibration acceleration and AE wave when this dresser contacts the grindstone, and use these measured values. The actual situation is to monitor the contact between the wheel and the dresser with great care.

[Problems to be Solved by the Invention] However, in order to know the minute dressing amount, it is time-consuming and the device is large-scale if the vibration acceleration or the AE wave is measured to monitor the contact between the grinding wheel and the dresser. There was a problem that it was expensive.

To solve this drawback, an air nozzle is attached slightly lower than the contact surface of the dresser with the grindstone, and when the flow rate of the air ejected from this air nozzle reaches a predetermined value by the principle of air micro, A dressing device for a grindstone has been proposed in which the distance between the ejection port of the air nozzle and the surface of the grindstone is detected, and the contact amount between the dresser and the grindstone is calculated from this value to obtain the dressing amount.

However, in this device, the air nozzle is displaced by the vibration when the dresser comes into contact with the grindstone, so it is very difficult to accurately install the distance between the contact surface of the dresser and the jet outlet of the air nozzle to a predetermined value. There was a problem that was. Also, if the tip of the air nozzle is accidentally ground or the dresser is worn, the gap between the air nozzle outlet and the grindstone will be different, so control the gap between the air nozzle and the grindstone. Had the problem of being very difficult.

The present invention has an object to provide a dresser having an air ejection port at a portion facing the grindstone, and further, the value of the air pressure ejected from the ejection port has become a predetermined value. An object of the present invention is to provide a dressing device for a grindstone that detects the dressing amount by detecting the dressing amount.

[Means for Solving the Problem] In order to solve the above-mentioned problems, the present invention is a dresser in which a dresser main body is provided with a nozzle and an air supply port, and an air ejection port communicating with the nozzle is provided on a dressing surface. . In addition, a whetstone mounting mechanism that allows the whetstone to be rotatably mounted and can be moved up and down, a dresser that has an air ejection hole communicating with an air supply source on the dressing surface facing the whetstone, and a movement that moves the whetstone toward the dresser. And means for detecting the air pressure ejected from the ejection port on the dressing surface of the dresser. Further, stop means may be provided for automatically stopping the moving means when the air pressure ejected from the ejection port of the dresser reaches a predetermined value.

[Operation] According to the present invention, since the air outlet is provided on the contact surface of the dresser with the grindstone, the contact surface of the dresser and the grindstone is moved to a predetermined distance by moving the dresser or the grindstone. Then, since the flow rate of the air ejected from the ejection port of the dresser becomes a predetermined flow rate,
When the air pressure having the predetermined value is detected, the dressing amount can be predetermined by further moving the dresser or the grindstone by a predetermined value.

[Embodiment] Referring to FIG. 1, a dressing portion 3 made of sintered diamond and metal is provided in the vicinity of a surface of an dresser 1 or the like facing a grindstone 2 and a nozzle is provided substantially at the center of the dresser 1. 4 is provided, and the jet port 4a of this nozzle has a surface 3a facing the grindstone 2 of the dressing portion 3.
It is provided in. The air supply port 4b of the nozzle 4 is connected to an air micrometer 6 via an air pipe 5, and the air micrometer 6 is connected to an air source (not shown) via a regulator 7.

In the present invention thus constructed, the relationship between the flow rate of air measured by the air micrometer 6 and the distance between the dresser ejection port 4a and the grindstone is plotted as shown by the curve A in FIG. When the grindstone 2 is moved in the direction of the dresser 1 and the value of the air micrometer 6 shows v, the distance between the jet port 4a of the dressing part 3 and the surface of the grindstone 2 becomes a predetermined value h. Is detected. Therefore,
When this value v is detected, if the grindstone 2 is further moved in the direction of the dresser 1 by a predetermined distance, an appropriate dressing amount can be obtained.

Even if the dressing portion 3 of the dresser 1 is cut and shortened by this dressing, if the distance between the air ejection port 4a and the surface of the grindstone 2 is the same, the flow rate of the air is the same. Unlike the above, there is no need to shift the position of the nozzle outlet. Further, instead of the air micrometer 6, a float flow meter, a bellows type flow meter, a Bourdon tube type flow meter, etc. can be used.

Referring to FIG. 3, in the apparatus according to the embodiment of the present invention, a dresser 1 is installed on a table 8, and a grindstone 2 is rotatably mounted on an up-and-down mechanism 10 which is raised and lowered by a handle 9. Further, the dresser 1 is connected to an air micrometer 6 provided below the handle 9.

In the apparatus of this embodiment configured as described above, the handle 9
Is rotated to lower the up-and-down mechanism 10, thereby bringing the grindstone 2 closer to the dresser 1. Then, the handle 9 is further rotated while looking at the air micrometer 6, and when the air micrometer 6 reaches a predetermined value, the handle 9 is further rotated by a predetermined value, so that the dressing with high accuracy can be performed. It can be performed.

As the dresser 1, a diamond 11 may be provided on the contact surface of the dresser 1 with the grindstone 2 and the nozzle 4 may be provided substantially at the center of the dresser 1 as shown in FIG. Block dresser 12 as shown in
A V-shaped dressing surface 13 may be provided on one surface and an air ejection port 14 may be provided on the dressing surface 13.

Further, as shown in FIG. 6, a nozzle 16 is provided on the surface from the center of the disk-shaped dresser 15, and a rotating shaft 17 of this dresser 15 is supported by bearings 19 and 20 provided on a supporting device 18,
The air hole 21 provided in the rotating shaft 17 may be communicated with the air chamber 22 of the supporting device 18, and the air may be supplied from the air supply hole 23 of the supporting device 18.

Further, as shown in FIG. 7, the nozzle 4 may be provided in the vicinity of the single stone diamond 11 of the single stone diamond dresser 1.

Even with this configuration, the dressers 1, 1 are the same as described above.
When the change in the air flow rate supplied to 2, 15 is detected and the air flow rate reaches a predetermined value, dressers 1, 12, 15
It is possible to detect the distance between each surface of the and the grindstone 2.

Referring to FIG. 8, in a dressing device for a grindstone according to another embodiment of the present invention, a dresser 1 is installed on a table 8 and a grindstone 2 is attached to an up-and-down mechanism 10 to move up and down.
A screw shaft 32 that moves up and down 10 is connected to a servomotor 24 and a cogenerator 25. The air supply hole of the dresser 1 is connected to the air-electric conversion device 27 via the air pipe 26,
Further, the air-electric conversion device 27 is an air pipe 26 and a regulator.
It is connected via 28 to an air supply source (not shown).
Further, the output of the air-electricity conversion device 27 is input to the position control device 30 of the CNC device 29, and the command value v is input to the position control device 30.
(For example, h = 5 μm) is input. Further, the output of the position control device 30 is input to the speed control device 31, and the output of the speed control device 31 is input to the servo motor 24. The rotation of the servo motor 24 is detected by the tacho generator 25, and the detected value is fed back to the speed control device 31.

In the dressing device of this embodiment configured in this way,
When the servo motor 24 is driven, the tacho generator 25 detects the rotation speed of the servo motor 24, and the vertical movement mechanism 10 is lowered while controlling the lowering speed thereof, and the grindstone 2 connected to the vertical movement mechanism 10 is lowered. Then, the air pressure ejected from the dresser 1 is detected by the air-electricity conversion device 27, and this air pressure is input to the position control device 30 as a command value v.
If it matches with, the surface of the air outlet of the dresser 1 and the grindstone 2
It is detected that the distance h from the surface of the has reached a predetermined value (for example, 5 μm). After that, the servo motor 24 is driven according to the program determined by the CNC device 29, and the vertical movement mechanism 10
Is lowered by a predetermined value to give the grindstone 2 a predetermined dressing amount.

In this embodiment, when the air pressure ejected from the dresser 1 by descending the up-down mechanism matches the preset command value v, the up-down mechanism 10 is further moved down according to the programmed amount to dress the grindstone 2. Therefore, the management of the dressing amount becomes very easy.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the distance between the grindstone and the facing surface of the dresser can be accurately measured by the dresser provided with the nozzle, and even if the dresser is worn by grinding. Further, there is an advantage that a predetermined distance between the grindstone and the nozzle ejection port can be accurately detected, and the dressing device can perform accurate dressing.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a dressing device for explaining the principle of the present invention, and FIG. 2 is a diagram showing a relationship between a distance between an air jet port of a dresser and a grindstone and a flow rate of air jetted from the jet port, FIG. 3 is a perspective view of a dressing device for a grindstone according to an embodiment of the present invention, FIG. 4 is a sectional view of a dresser according to an embodiment of the present invention, and FIG. 5 is a perspective view of a dresser according to another embodiment of the present invention. 6 and 7 are sectional views of a dresser according to still another embodiment of the present invention, and FIG. 8 is a perspective view of a dressing device for a grindstone according to an embodiment of the present invention. 1 ... Dresser, 2 ... Whetstone, 3 ... Dressing part, 4 ... Nozzle, 4a ... Jet port, 4b ... Air supply port,
5 ... Air tube, 6 ... Air micrometer, 7 ... Regulator, 8 ... Table, 9 ... Handle, 10 ...
Vertical mechanism, 11 …… Dymond, 12 …… Block dresser, 13 …… Dressing surface, 14 …… Air jet, 15 ……
Dresser, 16 ... Nozzle, 17 ... Rotating shaft, 18 ... Supporting device, 19, 20 ... Bearing, 21 ... Air hole, 21 ... Supporting device, 22 ... Air chamber, 23 ... Air supply hole , 24 ...... Motor, 25 ...... Tacho generator, 26 ...... Air pipe, 27 ...... Air-electric conversion device, 28 ...... Regulator, 29 ...... CNC device, 30 ...... Position control device, 31 ...... Speed control Device, 32 ……
Screw shaft.

Claims (3)

[Claims] 1. A dresser having a grindstone (2) rotatably supported and an air ejection port (4, 14, 16) communicating with an air supply source on a dressing surface (3a) facing the grindstone (2). (1, 12, 15), moving means (9, 10, 24) for changing the relative position of the grindstone (2) and the dresser (1), and air on the dressing surface (3a) of the dresser (1) A dressing device for a dresser and a grindstone, which comprises a detection means (6, 27) for detecting the flow rate of air ejected from the ejection ports (4, 14, 16). 2. An air outlet of the dresser (4, 14, 1)
The position control means (30) for controlling the moving amount of the moving means (9, 10, 24) after the flow rate of the air ejected from 6) reaches a predetermined value, is provided. Dressing device for dresser and grindstone described. 3. A dressing device for a dresser and a grindstone according to claim 1, further comprising speed control means (31) for controlling a moving speed of said moving means (9, 10, 24).