JPS6216281Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a grinding device for a workpiece, and its purpose is to
This is automatically detected and corrected so that the machine can always be machined to a predetermined constant size with high precision.

Conventionally, when grinding workpieces that require strict longitudinal and diameter dimensions,
First, the workpiece is brought into contact with a reference member in the longitudinal direction, and then the grinding wheel is moved diagonally forward while applying the end face dimensioning device to the end face to be ground, thereby grinding the workpiece to a predetermined size. In this case, there is a problem in that the reference surface changes due to thermal displacement of the reference member or the main spindle, wear of the reference surface of the reference member, etc., resulting in unstable machining dimensions.

The present invention solves the problems of conventional grinding equipment, and its feature is that the reference surface of the reference member is brought into contact with the end surface sizing device, and the end surface sizing device adjusts the settings according to changes in the reference surface. This is done by changing the momentary operating point.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a workpiece support device. That is, a main shaft spindle 3 is rotatably supported on the main body 2 of the apparatus, and the main shaft spindle 3 has a collet 4 at its distal end that is opened and closed by a cylinder 6, a piston 7, and a collet sleeve 5.

In the workpiece supporting device 1 as described above, the present invention includes a reference member 8 having a reference surface 9 on the same axis as the workpiece W gripped by the collet 4 and against which one end surface of the workpiece W comes into contact. Provided so that it can be moved forward and backward.
The means for moving the reference member 8 back and forth includes a shift cylinder 11, which connects the reference member 8 to an actuating rod 10 which is integral with the piston of the shift cylinder 11.

On the other hand, an end face sizing device 12 having a feeler 13 is installed in front of the collet 4. This end face sizing device 12 is movable forward and backward in a direction perpendicular to the axis of the workpiece W, and the feeler 13 is located at a position where it contacts the workpiece W or the reference surface 9 of the reference member 8 and at a position distant from it. It has a built-in release mechanism.

15 is a control circuit for a sizing signal detected by the end face sizing device 12; This control circuit 15 includes an amplification circuit 16, a detection circuit 17, and an analog switch 18.
a, 18b, a capacitor (storage device) 19, and a differential amplifier 20. The one analog switch 18a is connected to the forward end confirmation limit switch _LS1 of the reference member 8, and the capacitor 19 is connected between the analog switch 18a and the differential amplifier 20. The other analog switch 18b is connected to the reverse end confirmation limit switch _LS2 of the reference member 8. Both limit switches LS ₁ and LS ₂ are operated by dogs 22 provided on a dog bar 21 connected to the piston of the shift cylinder 11, respectively. In addition, the reference numeral 14 in the figure represents a grindstone, and l represents the standard length of the workpiece W.

Next, the operation of the device of the present invention will be explained.
The illustrated solid line indicates that the reference member 8 is located at the retreating end, and the workpiece W, which is held by the collet 4 with one end in contact with it, has its other end surface ground by the grindstone 14.
This is the time when the workpiece is machined to the specified standard length l. At this time, the feeler 1 of the end face sizing device 12
3, the position of the machined end surface of the workpiece W is measured, and a sizing signal S is transmitted based on the reference length l stored in the capacitor 19 of the control circuit 15. As a result, the grindstone 14 is returned to its original position, the rotation of the main spindle 3 is stopped, and the end face sizing device 12 is moved backward to avoid interference between the workpiece W and the filler 13. Incidentally, when the end face sizing device 12 retreats, the feeler 13 is positioned after being slightly pivoted rearward from its normal position. Next, the cylinder 6 for opening and closing the collet 4
is activated, the collet 4 is expanded to release the grip on the workpiece W, and the shift cylinder 11 is moved forward. By operating this shift cylinder 11, the reference member 8 is moved to the forward end, and the workpiece W is pushed out from the collet 4 and carried out. Reference surface 9 of reference member 8
The position has been advanced to the forward end position corresponding to the workpiece reference length l. In this state, the end face sizing device 12 is advanced to bring the feeler 13 into contact with the reference surface 9. At this time, the forward end confirmation limit switch
Since LS ₁ is pressed by dog 22,
The end face sizing device 12 measures the reference plane 9 at the forward end.
An output signal corresponding to the position of is stored in the capacitor 19. Using the signal stored in the capacitor 19 as a reference, the sizing operation point of the signal output from the end face sizing device during machining of the workpiece W is changed.

That is, after the feeler 13 is brought into contact with the reference surface 9 of the reference member that has moved to the forward end as described above and the output signal of the end face sizing device 12 is stored in the capacitor 19, the end face sizing device 12 is moved backward again. However, the feeler 13 also pivots rearward as shown by the imaginary line. Then, the reference member 8 is returned to the retreating end, the workpiece W to be machined is carried into the workpiece support device 1 and gripped by the collet 4, and the end face and cylindrical surface of the workpiece W are ground by advancing the grindstone 14. At this time, the end face sizing device 12 moves forward again, brings the feeler 13 into contact with the end face of the workpiece W to be machined, and measures the standard length l of the workpiece. Therefore, the sizing operation point of the end face sizing device 12 at this time is changed according to changes in the reference surface of the reference member when the workpiece W is carried out, thermal displacement, etc. The signal always maintains the workpiece reference length l.

In this way, the device of the present invention uses a simple mechanism to detect changes in the reference surface of the reference member when the finished workpiece is being carried out, and changes the sizing operating point of the end face sizing device in accordance with the change. Therefore, even if the reference member is worn out, thermally displaced, etc., a sizing signal of a predetermined workpiece reference length can always be obtained, and the workpiece can be machined with high precision.

[Brief explanation of the drawing]

The drawing is a sectional view of the main parts of the device of the present invention. 1...Workpiece support device, 2...Device main body, 3...
... Main shaft spindle, 4 ... Collet, 8 ... Reference member, 9 ... Reference surface, 11 ... Shift cylinder,
12... End face sizing device, 13... Feeler, 14
...Whetstone, 15...Control circuit.

Claims (1)

[Scope of utility model registration request] a reference member having a reference surface against which one end of a workpiece supported by a workpiece support device comes into contact, and is provided so as to be movable forward and backward with a predetermined stroke by a cylinder;
an end surface sizing device that contacts the other end surface of the workpiece to be ground and contacts the reference surface at the forward end of the reference member; A grinding device equipped with a control circuit that changes the sizing operating point of the sizing device.