JP2539802B2 - Method and apparatus for grinding wheel surface correction - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grinding wheel peripheral surface correcting method and an apparatus for carrying out the method.

[Prior Art] In some cases, a grinding operation grinds a workpiece having a width narrower than that of a grinding wheel. In this case, the peripheral surface of the grinding wheel is divided into a ground portion and a non-ground portion.

When correcting the peripheral surface of a grinding wheel with a dresser, conventionally, plunge feed is applied to the dresser toward the grinding surface of the grinding wheel, and the traverse feed and cutting are performed after the dresser comes into contact with the grinding surface. Although the work has started, in order to detect the contact of the dresser on the grinding surface of the grinding wheel,
It is based on indirect detection by contact of the detection pin or direct detection by contact of the dresser itself. Then, in the case of direct detection, to bring the dresser close to the peripheral surface of the grinding part,
There are cases of plunge feeding and cases of cutting while traverse feeding from the beginning.

[Problems to be Solved by the Invention] In the correction by the dresser on the peripheral surface of the grinding wheel,
In order to start correction, the dresser is brought to the contact position with the grinding wheel grinding surface, and when detecting the contact, the position of the detection pin with respect to the dresser is adjusted by indirect detection by the detection pin of the conventional technology described above. Work efficiency is poor because it has to be done, and even with direct detection by a dresser, the plunge feed marks lines on the peripheral surface of the grinding part due to the dresser, which affects the quality of the ground surface of the workpiece in the subsequent grinding work. If the traverse feed and the cutting are repeated from the beginning, the contact detection time is long and the efficiency is low.

The present invention eliminates the drawbacks of such prior art,
The grinding wheel peripheral surface is efficiently corrected by a dresser without damaging the grinding surface of the grinding wheel.

[Means for Solving Problems] In the grinding wheel peripheral surface correcting method of the present invention, when correcting the peripheral surface of a grinding wheel that grinds a workpiece having a width smaller than the width of the grinding wheel, first, the dresser is attached to the grinding wheel. Face the peripheral surface of the non-ground part,
Plunge feed toward it, and after the dresser comes into contact with the peripheral surface of the non-ground portion, the traverse feed of the dresser is started,
The dresser is cut in stages and the cutting wheel and the traverse feed are repeated until the contact of the dresser with the grinding surface of the grinding wheel is detected, and the grinding wheel circumferential surface is corrected.

Then, a grinding wheel peripheral surface correcting device for performing the grinding wheel peripheral surface correcting method includes a dresser for correcting the grinding wheel peripheral surface, a vertical feeding device for feeding the dresser in a direction parallel to the grinding wheel peripheral surface, and a dresser for the grinding wheel. A transverse feed device that feeds in a direction perpendicular to the peripheral surface,
A numerical control device for inputting a command signal to each drive circuit for driving the vertical feed device and the horizontal feed device, and a contact detection sensor for detecting contact between a dresser and a non-ground portion of a grinding wheel and a peripheral portion of a grinding portion. Receiving a detection signal from this contact detection sensor, the non-grinding part peripheral surface of the grinding wheel and the contact between the grinding part peripheral surface and the dresser are identified and the numerical control device is made to contact the non-grinding part peripheral surface contact signal and each grinding surface Comprising a comparator for inputting a contact signal, the numerical control device, at the start of grinding wheel correction, first the plunge feed command signal from the original position to bring the dresser into contact with the peripheral surface of the non-ground portion of the grinding wheel, When a grinding section peripheral surface contact signal is received, a repetitive traverse feed command signal and a cutting command signal are input to each of the drive circuits, and when a grinding section peripheral surface contact signal is received, a predetermined amount of cutting command signal and traverse command signal are input. The over scan feed command signal, after the predetermined amount of cut and the traverse feed completed, and inputs the return command signals to the original position to the respective drive circuits.

[Operation] First, the dresser is opposed to the peripheral surface of the non-ground portion of the grinding wheel, plunge feed is performed toward it, and the dresser is brought into contact with the peripheral surface of the non-grind portion. Then, after the dresser comes into contact with the peripheral surface of the grinding portion of the grinding wheel, a predetermined amount of cutting and traverse feed are performed to correct the grinding wheel peripheral surface.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an apparatus for carrying out the grinding wheel peripheral surface correcting method according to the present invention.

In a grinding wheel head 1 of a grinding machine, a dresser 3 is mounted behind a grinding wheel 2 mounted so as to be rotationally driven, and faces a peripheral surface 4 of the grinding wheel 2. On the table 5 in front of the grindstone 1, a workpiece 6 having a processing surface narrower than the width of the grinding wheel 2 is provided.
Is installed. Therefore, the peripheral surface 4 of the grinding wheel 2 is divided into the peripheral surface 7 of the grinding portion and the peripheral surface 8 of the non-grinding portion.

A vibration detection sensor 9 is attached to the dresser 3, and vertical and horizontal feeding devices 10 and 11 are also provided. Then, the detection signal from the vibration detection sensor 9 is input and is output to each of the vertical and horizontal feeding devices 10 and 11, and the dresser control device 12 having the configuration as shown in the block diagram of FIG. 1 is provided. ing.

In the dresser control device 12, the filter removes noise and sends a detection signal to the amplifier, which amplifies the detection signal and sends it to the non-grinding part comparator and the gate circuit. The non-grinding part comparator compares the vibration signal with the contact detection level and sends the non-grinding part peripheral surface contact signal to the numerical controller.

The grinding portion peripheral surface area detector detects the presence of the grinding portion peripheral surface area of the dresser 3 from the vertical feed command signal from the numerical control device, and sends the grinding portion peripheral surface area detection signal to the gate circuit. It is opened only when the peripheral surface area detection signal is input, and the detection signal from the amplifier is sent to the grinding section comparator. The grinding section comparator compares the detection signal with the contact detection level and sends the grinding section peripheral surface contact signal to the numerical controller.

In the numerical control device, the dresser faces the peripheral surface of the non-grinding part of the grinding wheel at the vertical feed position, and the original position signals which are separated at the horizontal feed position are programmed, and the vertical and horizontal feed devices 10 and 11 are driven. Each command signal is sent to each drive circuit to be operated.These command signals are the plunge feed command signal from the original position at the start, and the repetitive traverse feed command signal when the non-grinding part peripheral surface contact signal is received. And a cutting command signal, a traverse feed command signal and a cutting command signal a predetermined number of times when the grinding surface contact signal is received, and a return command signal to the original position after completion of the traverse feeding and cutting a predetermined number of times.

The method for correcting the peripheral surface of the grinding wheel according to the present invention will be described by the operation of the above apparatus.

First, at the time of starting, the dresser 3 programmed in the numerical control device of the dresser control device 12 faces the peripheral surface of the non-grinding portion of the grinding wheel at the vertical feed position, and the dresser 3 is placed at the distant original position at the horizontal feed position. Is located. Then, based on the output from the drive circuit to which the plunge feed command signal from the numerical controller is also inputted, the transverse feed device 11 causes the dresser 3 to operate.
Is plunged.

As a result, the grinding wheel 2 in which the tip of the dresser 3 is rotating
When the peripheral surface 8 of the non-ground portion is contacted, the contact is detected as vibration by the vibration detection sensor 9. The detected signal has other vibration components removed through a filter, is amplified by an amplifier and is input to a non-grinding part comparator, is compared with a grinding wheel peripheral surface contact detection level, and is not ground with the tip of the dresser 3. When the contact with the peripheral surface 8 is confirmed, a contact signal is sent from the comparator to each of the numerical control device and the gate circuit (see state A in FIG. 2).

Next, when a contact signal is input, a traverse feed command signal is sent from the numerical control device to the vertical feed device 10 of the dresser 3 and a cut command signal is sent to the lateral feed device 11, respectively, and the traverse feed and traverse feed of the dresser 3 are sent. The cuts at both ends of are repeated.

At the same time, whether or not the tip of the dresser 3 during traverse feeding is in the grinding surface peripheral area of the grinding wheel 2 is detected by the grinding area peripheral surface area detector from the longitudinal feed command signal from the numerical control device. When the tip of the grinding surface enters the grinding surface area, a grinding area detection signal is sent to the gate circuit. Then, the gate circuit is opened only when the grinding portion peripheral surface detection signal is input.

Since the peripheral surface of the non-ground portion is projected from the peripheral surface of the ground portion,
Even if the tip of the dresser 3 comes into contact with the peripheral surface of the non-ground portion and a contact signal is output, it does not contact the peripheral surface of the ground portion, and the dresser 3
Contact signal is not output when the tool is in the peripheral surface area of the grinding part (second
(See state B in Fig. B).

When the traverse feeding of the dresser 3 and the cutting at both ends thereof are repeated, the dresser 3 eventually contacts the peripheral surface 7 of the grinding portion. Then, the contact is detected as vibration by the vibration detection sensor 9. Other detected vibration components are removed from the detected signal through a filter, and then amplified by an amplifier and input to a gate circuit. As described above, the gate circuit opens only when the dresser 3 is in the peripheral surface area of the grinding portion during traverse feeding, and the detection signal from the vibration detection sensor 9 is input to the grinding portion comparator. The comparator compares the ground peripheral surface contact detection level to confirm contact between the tip of the dresser 3 and the peripheral surface of the ground portion (see state C in FIG. 2).

Then, the grinding part peripheral surface contact signal is sent from the comparator to the numerical control device, and at that time, the numerical control device outputs the traverse feed, the cut and the command signal which are repeated a predetermined number of times, and the dresser 3 repeats the predetermined number of times. Traverse feeding and cutting at both ends. Then, when that is completed, the dresser 3 returns to the original position by the original position return command signal from the numerical controller. Thus, the work for correcting the desired grinding wheel peripheral surface is completed.

[Effect of the Invention] According to the present invention, after the dresser comes into contact with the peripheral surface of the grinding portion, the dresser is further cut by a predetermined amount to delete the peripheral surface of the grinding portion. It becomes possible to reliably generate a cutting edge on the peripheral surface of the ground portion that has been damaged.

Further, the dresser is brought into contact with the peripheral surface of the non-ground portion, and the traverse feed and cutting of the dresser are started based on the contact detected position, so that the correction start position by the dresser can be quickly and accurately detected. .

Moreover, in detecting the contact between the tip of the dresser and the grinding wheel, even if the direct detection by the dresser is used in order to avoid the poor work efficiency such as the indirect detection by the detection pin,
Since the plunge is performed without the traverse feed from the beginning, the contact detection time is short and the efficiency is high. In addition, when the plunge feed is used, it is possible to avoid a scratch line due to the dresser on the peripheral surface of the grinding portion of the grinding wheel, and it is possible to prevent deterioration of the quality of the non-ground surface of the workpiece in the corrected grinding work.

[Brief description of drawings]

FIG. 1 is a plan view with a block diagram showing a grinder equipped with a dresser control device for carrying out the grinding wheel peripheral surface correcting method according to the present invention, and FIG. 2 shows the operation of the grinding wheel peripheral surface correcting method according to the present invention. It is an explanatory view shown. 1: Grindstone base, 2: Grinding wheel 3: Dresser, 4: Grinding wheel peripheral surface 5: Table, 6: Work piece 7; Grinding surface, 8: Non-grinding surface 9: Vibration detection sensor, 10: Vertical Feeding device 11: Lateral feeding device, 12: Dresser control device

Claims (3)

(57) [Claims] 1. A method for correcting a peripheral surface of a grinding wheel for grinding a workpiece having a width narrower than that of a grinding wheel. First, a dresser is gradually cut to perform a traverse feed to correct a peripheral surface of a non-ground portion. Then, after detecting that the dresser has come into contact with the peripheral surface of the grinding portion of the grinding wheel, further performing a predetermined amount of cutting and traverse feed to correct the peripheral surface of the grinding wheel. 2. A method for correcting a peripheral surface of a grinding wheel for grinding a workpiece having a width smaller than that of the grinding wheel, wherein a dresser is first opposed to a peripheral surface of a non-ground portion of the grinding wheel, and a plunge feed is directed toward the dresser. After the dresser comes into contact with the peripheral surface of the non-grinding part, the traverse feed of the dresser is started, the dresser is gradually cut, and it is detected that the dresser comes into contact with the peripheral surface of the grinding wheel. A grinding wheel peripheral surface correction method characterized in that a grinding wheel peripheral surface is corrected by repeating cutting and traverse feed. 3. A dresser for correcting a peripheral surface of a grinding wheel for grinding a workpiece having a width smaller than that of the grinding wheel, and a dresser for correcting the peripheral surface of the grinding wheel, and the dresser in a direction parallel to the peripheral surface of the grinding wheel. And a vertical feed device for feeding the dresser in a direction perpendicular to the grinding wheel peripheral surface, a numerical control device for inputting a command signal to each drive circuit for driving the vertical feed device and the horizontal feed device, and a dresser And a non-ground portion of the grinding wheel, and a contact detection sensor for detecting contact with the grinding surface, and a non-ground portion of the grinding wheel and a grinding portion peripheral surface of the grinding wheel and a dresser. And a comparator for inputting a non-grinding part peripheral surface contact signal and a grinding part peripheral surface contact signal to the numerical control device to identify the contact with the numerical control device. Contact the non-ground portion of the grinding wheel. Therefore, when the plunge feed command signal from the original position is received, the traverse feed command signal and the cut command signal which are repeated when the non-grinding part peripheral surface contact signal is received are input to the respective drive circuits, and the grinding part peripheral surface contact is made. When a signal is received, a predetermined amount of cut command signal and traverse feed command signal are input, and after the predetermined amount of cut and traverse feed is completed, a grindstone for inputting a return command signal to the original position to each of the drive circuits Vehicle surface correction device.