JPH0398744A - Positioning device for center of groove - Google Patents

Abstract

PURPOSE:To detect the center position of the grooves of a work quickly and with a high accuracy even in case of the pitch and width of these grooves being changed optionally, by attaching a pair of groove detecting sensors so as to position in the center of the groove of a work symmetrically with the shaft center of a detection head. CONSTITUTION:A rotating body 4 is freely rotatably fitted to a cylinder holding body 1 by a pulse motor 2, a detecting head 13 is provided with it projecting to the external part on one end part of this rotating body 4 and a pair of groove detecting sensors 16a, 16b are attached so as to position the center of the grooves Wa-Wd of a work W symmetrically with the shaft center of this detecting head 13. By rotating the detecting head 13 of the rotating body 4, a pair of the groove detecting sensors 16a, 16b are adjusted and controlled so as to coincide with the groove width S, T of the work W, the displacement quantity of the groove width of the work W is detected by the both groove detecting sensors 16a, 16b and the center position of these grooves Wa-Wd is detected quickly and with high accuracy, even in the case of the pitch P, Q and groove width S, T of the grooves of the work W being optionally changed.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a method for forming a plurality of grooves on the outer periphery of a cylindrical workpiece, such as an iron core used in a stator of an electric motor. Shape by grinding in the axial direction, or perform secondary processing such as chamfering on each groove (
The present invention relates to a groove center positioning device that determines the relationship between a chamfering tool and the center position of the groove during post-processing.

(Prior Art) Conventionally, means for locating the center of a groove in a workpiece of this type include a method using an encoder and a method using a proximity switch.

That is, the former means for positioning the center of the groove of the workpiece using an encoder is to install the workpiece as a rotating cylindrical body having a plurality of grooves between the headstock and the center headstock of the lathe, and place the encoder on the axis of the headstock. By installing it via a clutch equipped with a brake, the value obtained by dividing the number of pulses output when the encoder shown in the figure rotates once by the number of grooves on the workpiece as a rotating cylindrical body is calculated in advance to determine the distance between the groove pitches. After setting the origin on this encoder, drive the lathe to rotate the workpiece as a rotating cylinder, and when the encoder detects the number of pulses between the groove pitches, stop the rotation of the headstock. The grooves of the above workpiece are being indexed.

On the other hand, the latter means for locating the center of the groove of the workpiece using the proximity switch detects each edge of the groove of the workpiece as the rotating body, and when the rotation of the rotating body is stopped, the groove is located at the center of the grinding tool. The centers of the two are aligned using an indexing mechanism.

In other words, this means of locating the center of the groove on the workpiece using a proximity switch requires a mechanism to confirm that the center of the grinding tool and the center of the groove on the workpiece coincide at the time of initial setting, and each time the full width changes. The proximity switch is moved to align the center of the workpiece groove with the center of the grinding tool using the indexing mechanism.

(Problem to be Solved by the Invention) However, the above-mentioned former encoder-based means for locating the center of the groove of the workpiece is difficult to solve due to the slippage between the workpiece as a rotating body and the headstock, the slippage of the clutch brake, etc., and the grooves caused by the pre-processing process. Due to pitch errors in machining, minute errors at the start become cumulative errors as the number of grooves increases, resulting in a gradual increase in the error in the center of the groove relative to the center of the chamfering tool. Not only is it difficult to accurately determine the position relative to the grinding pins, but also when the pitch of the groove varies over many types, it is difficult to position the center of the groove accordingly.

On the other hand, the latter method of locating the center of the groove on the workpiece using a proximity switch requires a new mechanism to confirm that the center of the grinding tool and the center of the groove are aligned at the time of initial setting. Each time the groove width changes, the proximity switch must be moved to align the center of the groove with the center of the grinding tool using the indexing mechanism, which is cumbersome to handle and has problems with machining accuracy.

The present invention has been made in view of the above-mentioned circumstances, and even if the pitch and full width of the grooves of a workpiece as a rotating body are arbitrarily changed, the center position of these grooves can be quickly and accurately determined. It is an object of the present invention to provide a groove center positioning device that detects the center of a groove.

[Structure of the invention]

(Means for Solving the Problems and Their Effects) The present invention includes a rotating body rotatably fitted in a cylindrical holder using a pulse motor,
A detection head is provided at one end of the rotating body to protrude outward, and a pair of groove detection sensors are attached symmetrically to the axis of the detection head so as to position the center of the groove of the workpiece. By rotating the detection head, the pair of groove detection sensors are adjusted and controlled to match the full width of the workpiece, and both groove detection sensors detect the amount of displacement of the full width of the workpiece, and the groove of the workpiece is adjusted. Even if the pitch and full width of the grooves are arbitrarily changed, the center position of these grooves can be detected quickly and with high precision.

(Example) Hereinafter, the present invention will be described with reference to an illustrated embodiment.

1 to 6, reference numeral 1 denotes a cylindrical holder (frame) that is movably provided above a workpiece W in a rotary grinding device such as a lathe. A pulse motor (step motor) 2 is attached to the upper part 1a on one side.
A main gear 3 is mounted on the output shaft 2a. Further, in the cylindrical holder 1 beside the pulse motor 2, a cylindrical rotating body 4 has a pair of upper and lower bearings 5a and 5b.
A driven gear 6 meshed with the main gear 3 is mounted on the upper part 4a of the rotary body 4 through a set screw 7 with respective isolation members 8 and 9 interposed therebetween, so that it is substantially It is integrated into the . Further, inside the cylindrical body 4, each ball spline nut 10a, 10b is fitted with a retaining ring 12 via each detent key 11a, 11b to prevent the ball spline nut 10a from falling off. , 10b, a detection head 13 formed by a spline shaft is inserted into the flange 1 with a large number of balls (not shown) interposed therein.
It is mounted on a shaft to prevent it from falling off at 3a. Furthermore, an extensible coil spring 15 is interposed between the ring plate 14 in contact with the lower part of the rotating body 4 and the jaw portion 13b of the detection head 13, and this coil spring l5 , the vertical play (gap) of the detection head 13 is eliminated. Further, on the lower end surface 13c of the detection head 13, a pair of groove detection sensors 16a and 16b, such as optical sensors, proximity switches, air micrometers, etc., are attached symmetrically to the axis of the detection head 13. Both groove detection sensors 16a and 16b are disposed so as to face grooves WaSWb and WcSWd of different widths in the workpiece W formed by a rotating body rotatably attached to the rotary grinding device. Furthermore, the maximum detected full width Wn of the workpiece W by the rotating body is as shown in FIGS. 2 and 3,
It is determined by the maximum width value of the both groove detection sensors 16a116b.

Hereinafter, the effects of the present invention will be explained.

Therefore, in advance, the workpiece W, which is a rotary body, is rotatably attached to the rotary grinding device.

Next, as shown in FIG. 1, FIG. 4, and FIG. Since the shaft-mounted main gear 3 rotates the driven gear 6 that meshes with it, the rotating body 4 that is integral with the driven gear 6 is connected to each of the ball spline nuts 10a and 1.
0b is rotated via each locking key 11a, llb.

Then, each ball spline nut 10a110b
The above detection head 1 is connected to the spline shaft via the ball.
3 by a predetermined angle, this detection head 13
The groove detection sensors 16a and 16b attached to the grooves are kept perpendicular to the respective ends of the grooves Wa, WbSWe, etc. of the workpiece W formed by the rotating body, and detect the origin position with an origin sensor (not shown). to end the origin search.

Next, as shown in FIGS. 4 and 5, when the pulse motor 2 is driven by a pulse signal of the groove width T to be detected from a control device (not shown), the detection head 13 is activated as described above. Since it rotates by a predetermined angle, the double-groove detection sensor 16a116b attached to this detection head 13 detects the groove Wa for positioning the workpiece W.
to determine the center position.

Thereafter, when the two-groove detection sensors 16a and 16b detect the center positioning of the groove Wa in which the work W is positioned by the rotating body, the cylindrical holder 1 is lowered by a lifting device (not shown), and the two grooves are aligned. Groove detection sensor 16a,
The detection head 13 equipped with the detection head 16b is brought into contact with the outer peripheral surface of the workpiece W.

Next, when this work W is rotated by the rotary grinding device,
At the same time when the groove detection sensors 16a and 16b position the center of the groove Wa of the workpiece W and stop, the cylindrical holder 1 is raised by a lifting device (not shown), and then chamfered with a grinding tool, for example. The post-processing process will now begin.

In this way, the pair of groove detection sensors 16a, 16
b is adjusted and controlled so that it matches the groove width of the workpiece W, and both groove detection sensors 16a516b detect the displacement amount of the groove width of the workpiece W, and the pitch and groove width of the groove of the workpiece W as the rotating body are detected. Even if the grooves are arbitrarily changed, the center positions of these grooves can be detected quickly and with high precision.

Next, the operation of the present invention described above will be explained using mathematical formulas.

As shown in FIGS. 1 and 6, when the groove width of the workpiece W changes, the setting means sets the number of pulses for one rotation (360 degrees) of the pulse motor 2 to n pulses. Also, when the groove width changes from S to T, it rotates by 00 from the origin, so this is the angle, and the number of valves set for the pulse motor 2 to rotate can be determined by one.

θ 1 Note that Yb indicates the length of the full width, X indicates the radius of the groove 2 detection sensor, and ω indicates the distance from the axis of the detection head to the detection sensor.

Note that the workpiece W of the present invention is not limited to a cylindrical body, but may be linear, such as a rack, for example.

〔Effect of the invention〕

As described above, according to the present invention, a rotating body is rotatably fitted in a cylindrical holder using a pulse motor, a detection head is provided at one end of the rotating body to protrude outward, and the axis of the detection head is Since a pair of groove detection sensors are attached symmetrically so as to position the center of the groove of the workpiece, the two groove detection sensors described above can not only accurately detect the amount of displacement of the full width of the workpiece, but also Even if the pitch and width of the grooves on the workpiece are changed arbitrarily, the center position of these grooves can be detected quickly and with high precision. Not only can the center position of the groove be reliably positioned until the last groove, but even if the machine drawing is changed and the full width is changed, these pulse data can be manually input to the control device that controls the pulse motor in advance. Since the center position of the groove can be freely positioned, it is possible to improve the accuracy of post-processing such as chamfering using a grinding tool.

Figure 3 is a cross-sectional view taken along the chain line A-A in Figure 2;
6 through 6 are diagrams for explaining the operation of the present invention.

1... Cylindrical holder, 2... Valve mode, 4...
Rotating body, 6... Follower gear, 7... Set screw, 10a,
10b... Ball spline nut, 1 1 a,
1 1 b... Rotation key, 13... Detection head, 15... Coil spring, 16a, 16b... Groove detection sensor.

Claims (1)

[Claims] A rotating body is rotatably fitted into the cylindrical holder using a pulse motor, a detection head is provided at one end of the rotating body to protrude outward, and a pair of groove detection sensors are installed symmetrically around the axis of the detection head on the workpiece. A groove center positioning device characterized in that the groove center positioning device is attached so as to position the center of the groove.