JPH065081Y2 - Intermittent feeding device for grinding stone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an intermittent feeding device for a grinding wheel head in a grinding machine.

<Prior Art> A conventional automatic traverse grinding intermittent feeding device will be described with reference to FIG. However, the first in FIG.
As the pilot operated valve 16, the one represented as "current situation" in FIG. 1 was used.

In FIG. 1, the grindstone base 10 is moved forward and backward with respect to the work W supported by the table 1 by a rapid feed cylinder 13, and is cut and fed by a feed cylinder 14. The feed cylinder 14 includes the first pilot operation valve 16,
It is operated by pressure oil supplied from the intermittent feed cylinder 18 via the manual operation valve 25 and the second pilot operation valve 24.

The first pilot operated valve 16 has a port A for supplying pressure oil to the feed cylinder 14 and a port B for stopping the supply of pressure oil to the feed cylinder 14 when notching by the grindstone base 10 such as spark out is not performed. It is provided and is switched by the switching valve 17.

The manual operation valve 25 is an operation valve for manually switching which position of the work W is to be cut, and is a double-end cut port 25a that cuts at both ends of the work W, a right end cut port 25b that cuts at the right end of the work W, and the work W.
Is provided with a left end cut port 25c that cuts at the left end.

The second pilot operation valve 24 is switched in conjunction with a table operation valve 6 described later to feed the pressure oil from the intermittent feed cylinder 18 to the manually operated valve 25 side.

On the other hand, the table 1 is moved left and right by a traverse cylinder 4, and the traverse cylinder 4 is connected to a table direction switching valve 5. This table direction switching valve 5
Is the port 5a that moves the table 1 to the right, and the table 1
And a port 5b for advancing to the left. The table direction switching valve 5 is connected to the table operation valve 6. Therefore, each time the table 1 is located at the left end and the right end, the table operation valve 6 is switched, so that the table direction switching valve 5 moves the traverse cylinder 4
The pressure oil is alternately supplied to the rightward and leftward chambers of the table 1
To traverse.

A case in which the manually operated valve 25 has the right end notch set in the right end notch port 25b with the above configuration will be described. When the table 1 reaches the right end and the table operation valve 6 is switched to the left as shown in the drawing, the pipe 8
Pressure oil is supplied to the table direction switching valve 5
The pressure oil is supplied to the leftward-moving chamber of the traverse cylinder 4 to switch the table 1 to the left. Then, the pressure oil in the pipe 8 causes the second pilot operation valve 24 to move to the second port 2
4b, and the pressure oil supplied through the second port 24b changes to the piston 1 of the intermittent feed cylinder 18.
9 is moved to supply the pressure oil in the intermittent feed cylinder 18 to the manually operated valve 25. At this time, since the manual operation valve 25 is set to the right end cut port 25b, the pressure oil from the second port 24b flows into the first pilot operation valve 16, and at this time, the first pilot operation valve 16 enters the port A. Since it has been switched, pressure oil is supplied to the feed cylinder 14, and the grindstone base 10 is moved to make a cut.

Further, the table 1 reaches the left end, and the table operation valve 6
Is switched to the right travel, pressure oil is supplied to the pipe 9, the table direction switching valve 5 is switched to the port 5a, and the pressure oil is supplied to the right travel chamber of the traverse cylinder 4.
Move table 1 to the right. The pressure oil in the pipe 9 switches the second pilot operation valve 24 to the second port 24a, and the pressure oil supplied via the first port 24a moves the piston 19 of the intermittent feed cylinder 18,
The pressure oil in the intermittent feed cylinder 18 is supplied to the manually operated valve 25. At this time, the manually operated valve 25 is the right end cut port 2
Since it is set to 5b, the pressure oil from the first port 24a does not flow into the first pilot operation valve 16 and is drained to the low pressure side. Therefore, the work W is not cut.

In the same process, by switching the manually operated valve 25, it is possible to select a case where the work W is cut at both ends or a case where the work W is cut at the left end and the right end.

Further, when performing the spark-out, regardless of the position of the manually operated valve 25, neither of the ends of the work W is cut. In such a case, by switching the first pilot valve 17 to the port B by the switching valve 17, the supply of the pressure oil to the feeding cylinder 14 is shut off and the movement of the wheel head 10 is stopped.

<Problems to be Solved by the Invention> As described above, when performing spark-out in the intermittent feeding device, the pressure oil is supplied to the feeding cylinder 14 by switching the first pilot valve 17 to the port B. I was trying to shut it off. Such a method has a problem in that the pressure oil supplied from the intermittent feed cylinder 18 may be completely blocked and the movement of the piston 19 of the intermittent feed cylinder 18 may stop.

That is, even when the first pilot valve 17 is switched to the port B and spark out is performed, the switching valve 17 has the right end cut port 25b or the left end cut port 25.
In the case of c, when each port does not supply the pressure oil to the first pilot operation valve 16 side, the pressure oil is released to the low pressure side. Therefore, one of the left and right chambers of the intermittent feed cylinder 18 has a low pressure oil. Since it is opened to the side, it does not hinder the movement of the piston 19 of the intermittent feed cylinder 18.
However, when the switching valve 17 is set to the both-end cut port 25a, the pressure oil supplied to the both-end cut port 25a cannot escape to the low pressure side, and the piston 19 of the intermittent feed cylinder 18 can move. It will disappear and it will cause trouble.

Even if there is such a problem, when spark out is performed at the end of machining, no problem occurs because the cutting of the grinding wheel head 10 is not performed anymore. There is a request to do it on the way. In such a case, in the case of only the left end notch or the right end notch as shown in (a) and (c) of FIG. 2, the movement of the piston 19 of the intermittent feed cylinder 18 is hindered for the reason described above. Since there is no, the correct cutting work will be performed even if the cutting is performed again after sparking out. However, if both ends cutting like (b) and (d) in Fig. 2 are performed and sparking is performed in the middle, Since the piston 19 of the intermittent feed cylinder 18 is not correctly moved during the spark-out, there is a problem that the correct cutting is not performed even if the cycle is set to perform the cutting operation again after the spark-out. .

<Means for Solving Problems> The present invention solves the above-mentioned conventional problems, and the gist thereof is to provide a pressure oil fed from the intermittent feed cylinder to the second port of the first pilot operated valve. A drain port is provided to allow low pressure to escape to the low pressure side, the manual operation valve is set to the port for cutting both ends, and the first pilot operation valve is set to the second port. The pressure oil is released from the drain port to the low pressure side, and the supply of the pressure oil to the feed cylinder is shut off.

<Operation> In the present invention, the first pilot operated valve is set to the second port when performing spark-out. At this time, even if the manually operated valve is set to the port for cutting both ends, the pressure oil from the intermittent feed cylinder is drained to the low pressure side from the second port. For this reason, the piston of the intermittent feed cylinder operates normally even during the spark-out, and the correct cutting is performed even if the cutting is performed again after the spark-out.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a table, which includes a headstock 2 and a tailstock 3 that support a work W, and is horizontally moved by a traverse cylinder 4. Reference numeral 5 is a table direction switching valve that alternately supplies pressure oil to the left and right chambers of the traverse cylinder 4, and 6 is a table operation valve that is switched by a dog at the left and right traverse ends of the table 1, and the pressure oil is switched to the table direction. The table direction switching valve 5 is switched and supplied to the operating ports 5a and 5b of the valve 5, and the pressure oil is supplied to the later-described feed control circuit of the wheel head 10 through pipes 8 and 9. Reference numeral 7 is a table traverse start / stop valve.

Reference numeral 10 denotes a grinding wheel base, on which a grinding wheel 11 is rotatably mounted and is provided by a feed screw 12 so as to be movable back and forth in a direction orthogonal to the axis of the work W. Numeral 13 is a fast-forward cylinder for fast-forwarding and retreating the wheel head 10, which is controlled by the switching valve 15. 14 is a grindstone by rotating the feed screw 12
It is a feed cylinder that gives 10 feeds. The feed cylinder 14 may be a rotary cylinder or a direct-acting cylinder that converts a linear motion into a rotary motion by a rack and pinion mechanism to rotate the feed screw 12.

16 is a first for supplying and stopping pressure oil to the feed cylinder 14
It is a pilot operated valve, and the switching valve 17 uses the first port 16a.
And switched to the second port 16b. Details of the first pilot operated valve 16 will be described later.

18 is an intermittent feed cylinder. This intermittent feed cylinder 18
Is the piston 19 that slides in the cylinder and this piston
An adjustment rod 20 that variably adjusts the stroke of 19 and a locking cylinder 21 that presses the piston 19 against the adjustment rod 20 to restrain the movement of the piston 19 are provided. Reference numeral 23 is a switching valve for controlling the lock cylinder 21. 22 is also an intermittent feed cylinder, and when the intermittent feed cylinder 19 is a one-stage feed cylinder, it becomes a two-stage feed cylinder. 19a and 19b are the left of the intermittent feed cylinder 18 partitioned by the piston 19,
Right chamber.

24 is a second pilot operated valve. In this second pilot operated valve 24, the pressure oil that alternately flows through the pipes 8 and 9 is introduced into the operating port by switching the table operated valve 6, and the first port 24a and the second port 24b are switched alternately, and The pressure oil is introduced into the left chamber 19a of the intermittent feed cylinder 18 at the first port 24a, and the oil in the right chamber 19b pressed by the piston 19 moving to the right is led out by the first port 24a, and the pressure oil is intermittently discharged at the second port 24b. The left chamber 19a introduced into the right chamber 19b of the cylinder 18 and pressed by the piston 19 moving leftward
The oil is derived.

Reference numeral 25 is a manual operation valve for connecting the pressure oil from the intermittent feed cylinder 18 derived from the second pilot operation valve 24 to the first pilot operation valve 16. The manual operation valve 25 is configured so that all the pressure oil derived from any of the first and second ports 24a and 24b of the second pilot operation valve 24 is supplied to the first pilot operation valve 16
The pressure oil led out from the both-end cut port 25a and the first port 24a of the second pilot operated valve 24 drain to the low pressure side, and the pressure oil led out from the second port 24b is drained to the first pilot operated valve 16 Right end notch port to connect to
25b and the pressure oil derived from the first port 24a of the second pilot operation valve 24 are conducted to the first pilot operation valve 16, and the pressure oil derived from the second port 24b is drained to the low pressure side. The operator manually and selectively sets the switch. Reference numeral 26 is a Seiken switching valve.

Therefore, in the present invention, the first port 16a of the first pilot operated valve 16 supplies the pressure oil fed from the intermittent feed cylinder 18 to the feed cylinder 14, and the second port 16b supplies the pressure oil to the feed cylinder 14. The passage is closed to provide a passage for draining the pressure oil pressure-fed from the intermittent feed cylinder 18 to the low pressure side.

Next, the operation of the present invention will be described. Pressure oil is alternately supplied to the pipes 8 and 9 from the table operation valve 6 that is switched at the left and right traverse ends of the table 1, and the first and second ports 24a and 24b of the second pilot operation valve 24 are alternately switched and intermittent feed is performed. The pistons 19 are alternately introduced into the left and right chambers 19a and 19b of the cylinder 18, and the piston 19 is pushed by the pressure oil on the introduced side, so that the oil in the left and right chambers 19a and 19b is alternately extruded by the pistons 19 and the second pilot operated valve 24 Are alternately derived from the first and second ports 24a and 24b. The pressure oil derived from the second pilot operated valve 24 is the both-end cut port set by the manual operated valve 25.
25a, right end cut port 25b and left end cut port 25
Based on c, the grinding wheel head 10 is intermittently fed and cut at the left and right traverse ends, the right traverse end, and the left traverse end of the table 1.

Also, if you want to spark out after cutting,
The pilot operated valve 16 is switched to the second port 16b to bring the supply of pressure oil to the feeding cylinder 14 into a stopped state. As a result, the pressure oil from the intermittent feed cylinder 18 guided to the first pilot operated valve 16 by the left and right traverse of the spark-out table 1 is drained to the low pressure side, and the piston 19 of the intermittent feed cylinder 18 is always allowed to move left and right. The pressure oil is alternately introduced into and discharged from the left and right chambers 19a and 19b of the intermittent feed cylinder 18. Therefore, as shown in (a) to (d) of FIG. 2, the cuts after the spark-out can be immediately obtained at any of the left end, the left and right ends, and the right end without any limitation on the number of spark-outs.

<Effect of the Invention> As described above, in the present invention, since the drain port for releasing the pressure oil to the low pressure side is provided in the second port of the first pilot operated valve used when performing the spark out, the manually operated valve is cut at both ends. The pressure oil can be released to the low pressure side even when set for use. Therefore, the piston of the intermittent feed cylinder can be moved right and left correctly even during spark out. Therefore, the correct cutting is performed even in the processing cycle where the cutting is performed at both ends and the spark-out is performed on the way. Therefore, it is possible to favorably perform all the machining cycles without being restricted by the position of the cut or the timing of performing the spark-out.

[Brief description of drawings]

FIG. 1 is a circuit diagram of the present invention in which a conventional pilot operated valve is also shown, and FIG. 2 is an operation comparison explanatory diagram of the present invention and a conventional device. 1 ... Table, 5 ... Table direction switching valve, 6 ... Table operating valve, 10 ... Whetstone head, 14 ... Feed cylinder, 16 ... First pilot operating valve, 18 ... Intermittent feed cylinder, 24 ... … Second pilot operated valve, 25 …… Manually operated valve.

Claims (1)

[Scope of utility model registration request] 1. A headstock for supporting a work and a tailstock are provided.
A table that moves left and right by a traverse cylinder, a grindstone that moves forward and backward with respect to the work by a fast-forward cylinder, and cut feed is given by a feed cylinder, and pressure oil is alternately supplied to the left and right chambers of the traverse cylinder. A table direction switching valve, a table operation valve which is switched at the left and right traverse ends of the table, and which introduces pressure oil into the operating port of the table direction switching valve to switch the table direction switching valve, and drives the feed cylinder And a first port for supplying pressure oil to the feed cylinder when performing cutting feed by the grindstone base and a second port for stopping supply of pressure oil to the feed cylinder when stopping cutting feed by the grindstone base. The first port and the second port. Switchable first pilot operated valve, a piston that slides in the cylinder, an intermittent feed cylinder equipped with this piston, and the pressure oil from the table operated valve that is switched by switching the table operated valve. A second pilot operated valve which is alternately introduced into the left and right chambers of the intermittent feed cylinder and is led out alternately from the left and right chambers of the intermittent cylinder, and the second pilot operated valve which is alternately extruded from the left and right chambers of the intermittent feed cylinder. And a manual operation valve having a port for cutting one end of the work and a port for cutting both ends of the work, which guides the pressure oil drawn out through the first pilot operation valve, and intermittent grinding wheel head for sparking out during a machining cycle A feeding device is provided, and pressure is fed from the intermittent feed cylinder to the second port of the first pilot operated valve. A drain port for releasing the pressure oil to the low pressure side is provided, and the manually operated valve is set as a port for cutting both ends,
Moreover, when the first pilot operated valve is set to the second port to perform a spark out, the pressure oil is released to the low pressure side from the drain port provided in the second port, and the pressure oil to the sending cylinder is discharged. An intermittent feeding device for a grinding wheel stand, which interrupts the supply.