JP3169140B2 - Method and apparatus for detecting broken phase pin of camshaft mirror - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting breakage of a phase pin of a camshaft mirror for processing a camshaft.

[0002]

2. Description of the Related Art Conventionally, a camshaft used for an engine or the like is cut using a camshaft mirror, but it is necessary to perform phase positioning of the camshaft in the cutting. Conventionally, as shown in FIG. 1, a phase pin b is provided on a chuck a of a camshaft mirror, a work c is carried into the camshaft mirror, and then the chuck a is rotated without clamping the work c to form a work c. A method of positioning the phase of the work c by fitting the phase pin b into the pin hole d is adopted. After the phase of the work is positioned, the work c is further rotated as shown in FIG. 2 and the presence or absence of the rotation of the work c is detected by the sensor e as shown in FIGS. The presence or absence of breakage of the phase pin b is detected.

[0003]

However, among the phase pins b for performing the phase positioning of the camshaft, there is a phase pin b having a considerably small diameter of φ4, and the tip of the phase pin b is attached to the work c.
In the method of detecting the breakage of the phase pin b by rotating the work c while being inserted into the pin hole d, there is a problem that the phase pin b is broken. If the work c is rotated in a state where the center of the work c is insufficient, the work c is shifted to the phase pin b.
, And an excessive force is applied to the phase pin b to break the phase pin b. SUMMARY OF THE INVENTION The present invention has been made for the purpose of improving the above-mentioned conventional disadvantages, and provides a method and a device for detecting a broken phase pin of a camshaft mirror capable of detecting a broken phase pin without applying excessive force to the phase pin. It is something to offer.

[0004]

According to the present invention, in order to achieve the above object, a work to be machined is carried into a camshaft mirror, and then a chuck of the camshaft mirror is rotated while the work is restrained by a work brake mechanism. The phase pin provided on the chuck is inserted into the pin hole of the work to determine the phase of the work, and then the work is rotated with the work clamped by the chuck to perform the first indexing and the cam top of the work by the sensor. And then rotate the work again to detect the second index and the cam top of the work by the sensor.
And only when the sensor detects the cam top
If the phase pin is not broken,
It is determined that the pin is broken .

[0005]

[Work] Since the work is rotated while the work is clamped by the chuck by the above method and the breakage of the phase pin is detected at the position of the cam top of the work, excessive force is applied to the phase pin when rotating the work. Without acting, breakage of the phase pin can be prevented.

[0006]

FIG. 4 to FIG. 10 show an embodiment of the present invention.
This will be described in detail with reference to the screen shown in FIG. FIG. 4 is a front view showing the vicinity of the chuck of the camshaft mirror, and FIG. 5 is a side view of the same. In these figures, reference numeral 1 denotes a chuck, and 2 denotes a work supported between the chucks 1. A phase pin 3 is protruded from one side of the chuck 1, and the tip of the phase pin 3 is fitted into a pin hole 2 a formed in the work 2 so that the phase of the work 2 can be positioned. I have.

A sensor 4 for detecting the cam top 2b of the work 2 is provided above the work 2. The sensor 4 is configured by a proximity sensor or the like, and is attached to the attachment member 5 with the detection unit 4a facing downward. The mounting member 5 is attached to the tip of the piston rod 6a of the sensor elevating cylinder 6, and is moved up and down by the sensor elevating cylinder 6 from a standby position shown by a solid line in FIG. The sensor lifting cylinder 6 is a main body of a camshaft mirror (not shown).
The piston rod 6a is attached to the support member 7 which is provided upright so that the piston rod 6a faces downward, and the sensor 4 is moved up and down by air supplied through a pipe line 8.

On the other hand, a work brake mechanism 10 is provided beside the supporting member 7 for supporting the sensor lifting cylinder 6. The work brake mechanism 10 has a clamp arm 12 rotated by a clamp cylinder 11 as shown in FIG. 6, and presses a pad 12a provided at the tip of the clamp arm 12 against the outer peripheral surface of the work 2. Thereby, the work 2 is braked so as not to rotate during the phase positioning.

Next, a method for detecting breakage of the phase pin 3 will be described with reference to a flowchart shown in FIG. When the work 2 is carried into the camshaft mirror and both ends of the work 2 are supported by the center 1a of the chuck 1, the work brake mechanism 1 is moved in the pin insertion cycle shown in step (1) of FIG.
0 is turned on to restrict the rotation of the work 2. Then, the chuck 1 is rotated in this state, and the phase pin 3 protruding from the chuck 1 is fitted into the pin hole 2a of the work 2 as shown in FIG. When the phase positioning of the work 2 is completed, the work 2 is clamped in the chucking step shown in step (2) of FIG. 7 and the work brake mechanism 10 is simultaneously turned off. Lower to the detection position indicated by the line.

Then, the work 2 is rotated by a fixed angle as shown in FIG. 8B while the work 2 is clamped by the chuck 1 in the index 1 of step (3) shown in FIG. Then, in step (4), the cam top 2b of the work 2 is detected by the sensor 4. At this time, as shown in FIG. 9A, if the cam top 2b of the work 2 is within the detection area 4b of the sensor 4, the sensor 4 detects this and turns on. That is, in step (4) of FIG. 7, the cam top 2b of the work 2 is detected, and the process proceeds to step (5). If the cam top 2b cannot be detected at this time, since the phase positioning of the work 2 is defective, the process proceeds to step (9) to display an abnormality and stop the camshaft mirror.

On the other hand, index 2 in step (5) shown in FIG.
And then rotate the work 2 by a certain angle to
Index. At this time, the work 2 has already been clamped by the chuck 1 as in the first indexing, so that no excessive force acts on the phase pin 3 in the first and second indexing as in the related art. Then, when the work 2 is rotated by a predetermined angle, the sensor 4 is again rotated in step (6) of FIG.
To detect the cam top 2b of the work 2. At this time, if there is no breakage in the phase pin 3, the work 2 has been normally positioned in phase.
As shown in FIG. 9 (b), the cam top 2b
Sensor 4 reaches the detection area 4b of the cam top 2
b is detected and turned on, but if the phase pin 3 is broken, even if the cam top 2b is detected as shown in FIG. Even if the work 2 is rotated at a fixed angle in (5), the cam top 2b of the work 2 does not reach the detection area of the sensor 4 as shown in FIG.

Therefore, when the sensor 4 is turned on in both indexing and detection, it is determined that the phase pin 3 is not broken. When the sensor 4 is turned off in two detections, the phase pin 3 is turned off. No. 3 is determined to be broken, and the process proceeds to step (9). If it is determined that the phase pin 3 is not broken, the sensor 4 is raised to the standby position in step (7), and then proceeds to step (8) to proceed to the machining cycle of the workpiece 2 and perform the machining of the workpiece 2. Things. If the operation is abnormally stopped in step (9), the broken phase pin 3 needs to be replaced. In the above embodiment, the breakage of the phase pin 3 is detected. However, when a phase key is used in place of the phase pin 3, the breakage of the phase key can be detected.

[0013]

According to the present invention, as described in detail above, after the phase of the work is positioned by the phase pin, the work is rotated while the work is clamped by the chuck, and the breakage of the phase pin is detected by the position of the cam top of the work. As a result, no excessive force is applied to the phase pin during the rotation of the work. As a result, when the breakage of the phase pin is detected,
Since the phase pin is not broken and the work is not interrupted due to the phase pin being broken, the productivity can be improved. In addition, since the breakage of the phase pin is detected by performing the indexing and detection twice, non-contact and irregularly shaped cam tops can be accurately detected using a proximity sensor or the like, so that the reliability is high.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a conventional phase positioning method.

FIG. 2 is an explanatory diagram showing a conventional method for detecting a broken phase pin.

FIGS. 3A and 3B are explanatory views showing a conventional method for detecting a broken phase pin. FIG.

FIG. 4 is a front view of a camshaft mirror according to one embodiment of the present invention.

FIG. 5 is a side view of a camshaft mirror according to one embodiment of the present invention.

FIG. 6 is a sectional view taken along the line AA in FIG. 4;

FIG. 7 is a flowchart showing the operation of the present invention.

FIGS. 8A and 8B are explanatory diagrams showing the operation of the present invention.

FIGS. 9A and 9B are explanatory diagrams illustrating the operation of the present invention.

FIGS. 10A and 10B are explanatory views showing the operation of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Chuck, 2 ... Work, 2a ... Pin hole, 2b ... Cam top, 3 ... Phase pin, 4 ... Sensor, 10 ... Work brake mechanism.

Claims (2)

(57) [Claims] After a workpiece to be machined is loaded into a camshaft mirror, a chuck of a camshaft mirror is rotated while the workpiece is restrained by a work brake mechanism, and a phase pin provided on the chuck is moved to the workpiece. 2 is positioned in the pin hole 2a of the work 2 and then the work 2 is rotated in a state where the work 2 is clamped by the chuck 1 and the first indexing and the cam top 2b of the work 2 by the sensor 4 are performed. Is detected, and then work 2 is performed again.
Is rotated to perform the second indexing and the detection of the cam top 2b of the work 2 by the sensor 4, and these two detections
Only when the sensor 4 detects the cam top 2b
If the phase pin 3 is not broken,
A phase pin breakage detection method for a camshaft mirror, wherein it is determined that the phase pin 3 is broken . 2. A sensor 4 which is movable in the direction of the work 2 by a sensor 4 elevating cylinder 6 is provided in the vicinity of the work 2 whose both ends are clamped by the chuck 1 of the camshaft mirror. A camshaft mirror phase pin breakage detecting device for detecting the cam top 2b of the work 2 by the sensor 4 .