JPS60232870A - Grinding wheel correction device - Google Patents

Abstract

PURPOSE:To correct the grinding face of grinding wheel highly accurately without casing damage by detecting the grinding face position of grinding wheel through an air-micrometer and controlling the relative cutting of a correction tool against the grinding wheel. CONSTITUTION:The detection nozzle 41 of an air-micrometer is indexed at the position where a traverse table is moved by the distance L1 in Y-direction to correspond with a grinding wheel G. The distance (a) between the tip of a correction tool 26 and the position for outputting the nozzle 41, the advance (b) of the grinding wheel G and the cutting (d) are set previously by a data input system. The intermediate section of an interval where the output V from a pressure converter is proportional to the gap SG between the grinding wheel G and the nozzle 41 is set as 0 output of the converter to be set to 0 output upon advance of the grinding wheel G by the distance (b). Abrasion (e) of the grinding wheel G detected through variation of the output V is added to operate the retraction S of the grinding wheel while the tool 26 is moved by the distance L2 and corrected.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a grinding wheel correction device for correcting a grinding wheel.

<Prior art> As one of the conventional grinding wheel correction devices, the position of the grinding surface of the grinding wheel is detected in advance, the cutting of the correction tool is performed based on this grinding surface, and the amount of correction is always maintained regardless of the wear of the grinding wheel. There is a grinding wheel correction device that makes the grinding wheel constant.

However, since such a grinding wheel correction device uses a so-called contact method in which a vibration detection head is used as a means to detect contact between the grinding wheel and the correction tool, the grinding surface of the grinding wheel may be scratched at the time of contact, resulting in subsequent correction. These scratches are not completely removed during work, making it impossible to correct the grinding surface with high precision.
In order to prevent this, if the amount of correction in the above-mentioned correction work is increased, the abrasive grains are scraped off unnecessarily, resulting in rapid wear and tear, which has the disadvantage of shortening the life of the grinding wheel.

<Object of the Invention> The present invention was made in order to eliminate such conventional determination, and its purpose is to detect the position of the grinding surface of a grinding wheel without contacting it without damaging the grinding surface. , to perform corrections with high precision without wasting the grinding wheel.

<Configuration of the Invention> In order to achieve the above object, the present invention uses an air micrometer as a means for detecting the position of the grinding surface of the grinding wheel, and adjusts the correction tool to the grinding wheel based on the output from the air micrometer. The structural feature is that the relative depth of cut is controlled.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 10 indicates a numerically controlled grinding machine to which the grinding wheel correction device of the present invention is applied, and this grinding machine includes a grinding wheel head 11 that is movable in the X direction and a Y direction that is perpendicular to this. A grinding wheel G is rotatably supported on this grinding wheel head 11. Further, a correction unit 20 for correcting the grinding wheel G is installed on the upper right side of the traverse table 12, and a swivel table 13 is rotatably supported on the upper left side of the traverse table 12. A main 1/111 stand 14 and a tailstock 15 which centrally support the workpiece W are supported.

The traverse table 12 is fed by a feed device 32 consisting of a servo motor MY and a feed screw 31, and the grindstone head 11 is advanced in cutting by a cutting device 34 consisting of a servo motor Mx and a feed screw 33. The grinding process of the workpiece W and the correction of the grinding wheel G are performed by the relative movement of the grinding wheel head 11 and the traverse table 12.

As shown in FIG. 2, the correction unit 20 includes a fixed base 21 fixed on the traverse table 12, and a swivel base 23 supported on the fixed base 21 so as to be rotatable about a pivot shaft 22. A unit main body 24 fixed on the swivel table 23, a rotating shaft 25 rotatably supported on the unit main body 24, a correction tool 26 consisting of a roll attached to the tip of the rotating shaft 25, and the correction tool 26. It consists of a drive motor 27 that rotates the tool 26.

The correction tool 26 has a cup shape as shown in FIG.
Diamond grains 28 of large grain size are embedded at equal intervals in the circumferential direction. The rotating shaft 25 and the correction tool 26 are supported on the unit main body 24 so that the diamond grains 28 are located on the axis of the pivot shaft 22, and the correction tool 26 moves the diamond grains 28 by the rotation of the swivel table 23. It is possible to adjust the rotation around the center.

As shown in FIG. 1, an air micromake 40 for detecting the position of the grinding surface is installed on the side of the correction unit 20. This air micrometer 40 is connected to the grinding wheel G.
A detection nozzle 41 installed on the traverse table 12 to blow air toward A pressure transducer 47 converts the back pressure change into an electrical signal and outputs it, and the relative position of the grinding wheel G with respect to the detection nozzle 41 can be detected from the output of the pressure transducer 47.

Further, 60 distributes command pulses to the servo motor Mx and servo motor MY via drive circuits 61 and 62, respectively, to move the grinding wheel head 11 and traverse table 12, and to amplify the output from the pressure transducer 47. 63, an AD converter 64, and an interface 65.

In addition to a grinding program for grinding the workpiece W by relatively moving the grindstone head 11 and table 12, the memory 67 stores a grinding wheel correction program for correcting the grinding wheel G using the correction tool 26. Arithmetic processing unit 6G
reads out the program and data stored in this memory 67, and automatically performs correction work on the grinding wheel G based on these.

The details of the processing operation of this arithmetic processing unit 66 will be explained below with reference to FIGS. 4 and 5.

During grinding, the workpiece W is located at the position corresponding to the grinding wheel G, but at the same time as the grinding wheel correction command is output, the fourth
The processing operation shown in the figure is started, and as a result, the required number of pulses are applied to the servo motor My, and the traverse table 12 is moved by Ll in the Y direction to a position corresponding to the grinding wheel G as shown in FIG. The detection nozzle 41 of the air micrometer 40 is indexed. (Step 100) Next, dimensional data a, b, and d are read. Note that a is the distance between the tip of the correction tool 26 and the position where the detection nozzle 41 outputs "0", b is the amount of advance of the grinding wheel G, and d is the amount of cut.
Both are known dimension data set in advance by the data input device 68. Thereafter, a required number of pulses are applied to the servo motor Mx to move the grinding wheel G forward by a distance @b toward the detection nozzle 41, and at the forward end, the output (2) of the pressure transducer 47 is read. As shown in FIG. 6, the air micrometer 40 has a characteristic that there is a section in which the output V of the pressure transducer 47 is proportional to the gap SG between the grinding wheel G and the detection nozzle 41, and there is a section in the middle of this proportional section. is set as "0" of the output of the pressure transducer 47. Then, when the grinding wheel G is advanced by a distance from the grinding wheel G in the original position, the output of the pressure transducer 47 is set to become PaO''.However, in reality, the grinding surface of the grinding wheel G wear e has occurred, and when the grinding wheel G is advanced a certain distance, a change occurs in the output V of the pressure transducer 47. Therefore, the wear e of the grinding wheel G is detected from this output change. (Step 103) Subsequently, the retraction amount S of the grinding wheel G is calculated, a pulse is sent to the servo motor Mx based on the calculation result, and the grinding wheel G is retracted by the gap S.

(Steps 104, 105) In this state, the required number of pulses are applied to the servo motor MY.
As a result, the correction tool 26 is relatively moved by a distance % 11iL2 in the Y direction across the front surface of the grinding wheel G, and the grinding wheel G is corrected. (Step 106) Note that the retraction amount S of the grinding wheel G takes into account the wear e of the grinding wheel G as described above, so the grinding wheel G has a constant cutting depth d regardless of the wear of the grinding wheel G. Fixed.

Thereafter, the required number of pulses are sent to the servo motor Mx, and the grinding wheel G is moved back to the original position in the X direction. Furthermore, pulses are sent to the servo motor My, and the correction tool 26 and the detection nozzle 41 are distance L relative to
It is moved by 1+L2. (Steps 107, 108)
As a result, the detection nozzle 41 and the correction tool 26 are connected to the grinding wheel G.
The workpiece W is positioned further to the right, and at the same time, the workpiece W is positioned in front of the grinding wheel G, completing a series of grinding wheel correction operations.

In the above embodiment, the grinding wheel G is used for the correction tool 26.
Although the cutting is performed by advancing the grinding wheel G, the present invention is not limited to this. A feeding device and a cutting device are provided on the correction unit throat 20 side, and the correction tool 26 is made to cut and advance with respect to the grinding wheel G. It's okay.

<Effects of the Invention> As detailed above, the grinding wheel correction device of the present invention uses an air micrometer as a means for detecting the position of the grinding surface of the grinding wheel, and adjusts the grinding wheel based on the output from the air micrometer. Since the configuration controls the relative depth of cut of the correction tool against the grinding surface, the position of the grinding surface of the grinding wheel can be detected without contact without damaging the grinding surface of the grinding wheel, and as a result, the grinding wheel is not wasted. It has the advantage of being able to be corrected with high precision without being wasted.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing a numerically controlled grinding machine equipped with the grinding wheel correction device of the present invention, FIG. 2 is a front view of a corrected corner and throat, and FIG. The figure is a sectional view of the correction tool, Figure 4 is a flowchart showing the processing operation of the arithmetic processing unit, Figure 5 is an operation explanatory diagram explaining the positional relationship of the grinding wheel with respect to the correction tool, and Figure 6 is the grinding wheel and detection nozzle. It is a figure which shows the output change of a pressure transducer with respect to the gap between. 26... Correction tool, 32... Feeding device, 33...
Cutting device, 41... detection nozzle, 60... control device, G... grinding wheel. Patent applicant horizontal chord. Figure 2 Figure 6 Figure 5G Figure 4 Figure 5

Claims (1)

[Claims] (]) i A correction tool for correcting a stone wheel, a grinding wheel, and an air micrometer that is installed opposite to the grinding surface of this grinding wheel and detects the position of the grinding wheel by changing the back pressure according to the gap between it and the detection head. a feeding device that moves the grinding wheel relative to the correction tool and the detection head of the air micrometer in the grinding wheel axial direction; and a cutting device that moves the correction tool and the detection head relative to the grinding wheel in the radial direction of the grinding wheel. A grinding wheel correction device comprising: a control device that controls the cutting device based on the output of the air micrometer and controls the relative cutting amount of the correction tool with respect to the grinding wheel.