JPH0445809Y2 - - 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 intermittent feed device for automatic traverse grinding is equipped with a headstock and a tailstock that support a workpiece, a table that moves left and right by a traverse cylinder, and a rapid feed cylinder that moves along the axis of the workpiece. A grindstone head that moves forward and backward in a direction perpendicular to the grinding wheel and is given cutting feed by a feed cylinder;
a table direction switching valve that alternately supplies pressure oil to the left and right chambers of the traverse cylinder; and a table direction switching valve that is switched at the left and right traverse ends of the table and introduces pressure oil into an operating port of the table direction switching valve. a table operating valve for switching, a first pilot operating valve that supplies and stops pressure oil to the feed cylinder, a piston that slides inside the cylinder, and an adjustment rod that variably adjusts the stroke of this piston. A second system for alternately introducing pressurized oil from an intermittent feed cylinder equipped with the table operation valve and a table operation valve switched by switching the table operation valve into the left and right chambers of the intermittent feed cylinder, and alternately leading it out from the left and right chambers of the intermittent cylinder. A pilot operating valve, and notches at the left and right ends as well as at both ends for guiding pressure oil alternately pressed out from the left and right chambers of the intermittent feed cylinder and led out through the second pilot operating valve to the first pilot operating valve. It is equipped with a manually operated valve having three ports, and the piston of the intermittent feed cylinder moves left and right every time the table moves to the left and right traverse ends, and the pressure oil is alternately introduced into the left and right chambers. The pressurized oil is supplied to the feed cylinder based on the settings of the ports at the left end, right end, and both end notches of the manually operated valve, and a notch is intermittently provided at the left end, right end, or each left and right end.

<Problems to be solved by the invention> In the conventional device, the intermittent notch feed of the grinding wheel head is performed at the traverse end of the table;
Even during table traverse, the first pilot operation valve that supplies and stops pressure oil to the feed cylinder may be switched to the supply port side.
Leakage of pressure oil from the second pilot operated valve and the manual operated valve flows into the feed cylinder, and as a result, as shown in FIG.
Even when attempting to perform regular traverse grinding B based on the above, the grinding wheel head cuts into the grinding wheel, resulting in tapered grinding C, which may not be able to handle minute intermittent cuts.

<Means for Solving the Problems> The present invention solves the above-mentioned conventional problems, and its characteristic configuration is that, in the conventional intermittent feeding device of the grinding wheel head, the first part for controlling the feeding cylinder is 1. A drain port is installed in the port that stops the pressure oil to the feed cylinder of the pilot operation valve to release the pressure oil fed from the intermittent cylinder, etc. to the low pressure side, and the traverse end is confirmed on the table, and this confirmation signal is used to confirm the table traverse end. A switching control means is provided for controlling switching of the first pilot operating valve to the pressure oil supply port only.

<Operation> In the present invention, during traverse grinding of the table, the first pilot operating valve is switched to the drain port side, and only when applying intermittent notches at the traverse end, it is switched to the pressure oil supply port side based on the traverse end confirmation signal. to give intermittent cutting feed to the grindstone head.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, a table 1 includes a headstock 2 and a tailstock 3 for supporting a workpiece W, and is moved left and right by a traverse cylinder 4. 5 is a table direction switching valve that alternately supplies pressure oil to the left and right chambers of the traverse cylinder 4; 6 is a table operation valve that can be switched by a dog at the left and right traverse ends of the table 1; operating port 5a of valve 5;
5b to switch the table direction switching valve 5, and at the same time, pressure oil is supplied to the feed control circuit of the grindstone head 10, which will be described later, via pipes 8 and 9. 7 is a table traverse start/stop valve.

Reference numeral 10 denotes a grindstone head, on which a grindstone wheel 11 is rotatably mounted on a shaft, and is provided so as to be movable forward and backward in a direction orthogonal to the axis of the workpiece W by means of a feed screw 12. Reference numeral 13 denotes a fast-forwarding cylinder that rapidly moves the grinding wheel head 10 forward and backward, and is controlled by a switching valve 15 . Reference numeral 14 is a feed cylinder that rotates the feed screw 12 and provides cutting feed to the grindstone head 10. The feed cylinder 14 may be a rotary cylinder or a linear cylinder that rotates the feed screw 12 by converting linear motion into rotary motion using a rack and pinion mechanism.

Reference numeral 16 denotes a first pilot operation valve that supplies and stops pressure oil to the feed cylinder 14, and an electromagnetic switching valve 17 that controls the first port 16a and the second port 16b.
can be switched to This first pilot operated valve 16
The details will be described later.

18 is an intermittent feed cylinder. The intermittent feed cylinder 18 includes a piston 19 that slides inside the cylinder, an adjustment rod 20 that variably adjusts the stroke of the piston 19, and a lock that presses the piston 19 against the adjustment rod 20 to restrain the movement of the piston 19. It is equipped with a cylinder 21 for use. 23 is a switching valve that controls the lock cylinder 21. 22
The intermittent feed cylinder 19 is also an intermittent feed cylinder, and when the intermittent feed cylinder 19 is made into a one-step feed cylinder, it becomes a two-step feed cylinder. 19a and 19b are left and right chambers of the intermittent feed cylinder 18, which are partitioned by the piston 19.

24 is a second pilot operated valve. This second
The pilot operating valve 24 is configured such that pressure oil flowing alternately through the pipes 8 and 9 is introduced into the operating port by switching the table operating valve 6, and the first port 24a and the second port 24b are alternately switched. Pressure oil is introduced into the left chamber 19a of the intermittent feed cylinder 18 at the first port 24a, and the right chamber 19 is thereby pressed by the piston 19 moving to the right.
The second port 24b introduces the pressure oil into the right chamber 19b of the intermittent cylinder 18, which causes the left chamber 19 to be pressed by the piston 19 moving leftward.
This is to derive the oil of a.

Reference numeral 25 denotes a manually operated valve that allows the pressure oil from the intermittent feed cylinder 18 led out from the second pilot operated valve 24 to be conducted to the first pilot operated valve 16. This manual operation valve 25 has cut-out ports 25a at both ends that allow all the pressure oil led out from any of the first and second ports 24a and 24b of the second pilot operation valve 24 to be conducted to the first pilot operation valve 16.
and the first port 24 of the second pilot operated valve 24
The pressure oil derived from a is drained to the low pressure side and
A right-end notch port 2 that conducts pressure oil led out from the port 24b to the first pilot operating valve 16.
5b, and the pressure oil led out from the first port 24a of the second pilot operation valve 24 is conducted to the first pilot operation valve 16, and the pressure oil led out from the second port 24b is drained to the low pressure side through the left end notch port 2.
5c, and is selectively switched and set manually by the operator. 26 is a fine-tuned switching valve.

Therefore, the present invention provides the first pilot operated valve 1.
The first port 16a of No. 6 is connected to the intermittent feed cylinder 1.
8, the pressure oil is supplied to the feed cylinder 14, and the second port 16b is connected to the feed cylinder 1.
4 and close the pressure oil supply path to the intermittent feed cylinder 1.
A passage is provided to drain the pressure oil pumped from 8 etc. to the low pressure side, and the table has dogs D1 and D2 at the left and right traverse end positions, and the dogs D1 and D
A limit switch LS1 is provided to confirm the traverse end, which is operated at step 2.
In response to the traverse end confirmation signal from LS1, the first port 16a of the first pilot operating valve 16;
That is, the pressure oil supply port is switched to communicate with the feed cylinder 14 only at the table traverse end. As the switching control means for the first pilot operating valve 16, a third pilot operating valve 16 is used.
As shown in the figure, the solenoid of the electromagnetic switching valve 17
SOL1 is electrically connected to the limit switch LS1, and during traverse of the table 1, the solenoid SOL1 of the electromagnetic switching valve 17 is energized to switch to the second port 16b of the first pilot operating valve 16, and at the end of the traverse, the solenoid SOL1 is switched to the second port 16b of the first pilot operating valve 16. energization is turned off, the electromagnetic switching valve 17 is switched with a spring, and the first port 1 of the first pilot operating valve 16 is switched off.
Switch to 6a. Although not shown, the first
The pilot operating valve 16 may be electromagnetically switched, and the first pilot operating valve 16 may be switched directly by the signal from the limit switch LS1.

Next, the operation of the present invention will be explained. Pressure oil is alternately supplied to the pipes 8 and 9 from the table operation valve 6 which is switched at the left and right traverse ends of the table 1, and the pressure oil is supplied to the first and second piping of the second pilot operation valve 24.
The ports 24a and 24b are alternately switched, and the oil is introduced into the left and right chambers 19a and 19b of the intermittent feed cylinder 18 alternately.
9 alternately pressurizes the second pilot operating valve 2.
4 first and second ports 24a and 24b alternately. The pressure oil led out from the second pilot operation valve 24 is applied to the left and right traverse ends, the right traverse end and the left At the traverse end, the grindstone head 10 is intermittently fed and cut.

Therefore, the intermittent feed is given to the grindstone head 10 by operating the limit switch LS1 by the dog D1 or D2 at the traverse end, and by operating the first port 16 of the first pilot operating valve 16.
During traverse of the table 1, the first pilot operated valve 16 is switched to the second port 16b, and the second pilot operated valve 24 and the manual operated valve are switched to the second port 16b. 2
The oil leaking from 5 is drained to the low pressure side and does not flow to the feed cylinder 14.

<Effects of the Invention> As described above, the present invention provides a first pilot operating valve that stops the pressure oil from the intermittent feed cylinder, etc. that is supplied to the feed cylinder of the grinding wheelhead, and a drain passage that releases the pressure oil to the low pressure side. The first pilot operating valve is switched to supply pressure oil from the intermittent feed cylinder, etc. to the feed cylinder only at the traverse end, and drains to the low pressure side during the traverse, based on the confirmation signal at the traverse end of the table. This structure prevents the oil leaking from the second pilot operating valve and manual operating valve during traverse from flowing into the feed cylinder and causing unnecessary cuts on the grinding wheel head, and even in small intermittent cuts, high Accurate traverse grinding can be achieved.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the device of the present invention;
Figure 2 is an explanatory diagram of problems with conventional equipment, Figure 3
The figure is a switching control circuit diagram. 1...Table, 5...Table direction switching valve,
6...Table operation valve, 10...Whetstone head, 1
4... Feed cylinder, 16... First pilot operating valve, 17... Solenoid switching valve, 18... Intermittent feed cylinder, 24... Second pilot operating valve, 2
5...Manual operation valve, LS1...Limit switch.

Claims (1)

[Claims for Utility Model Registration] A table that is equipped with a headstock and a tailstock that support a workpiece and is moved left and right by a traverse cylinder, and a table that is moved forward and backward in a direction perpendicular to the axis of the workpiece by a rapid feed cylinder. and a grindstone head to which cutting feed is applied by a feed cylinder; a table direction switching valve which alternately supplies pressure oil to the left and right chambers of the traverse cylinder; and a table direction switching valve which is switched at the left and right traverse ends of the table and which switches the table direction. A table operating valve for introducing pressure oil into an operating port of the valve to switch the table direction switching valve, a first pilot operating valve for supplying and stopping pressure oil to the feed cylinder, and a piston that slides inside the cylinder. and an adjustment rod for variably adjusting the stroke of the piston, and an intermittent feed cylinder that alternately introduces pressurized oil, which is switched by switching the table operation valve, into the left and right chambers of the intermittent feed cylinder, and a second pilot operating valve that alternately draws out pressure oil from the left and right chambers of the cylinder; and pressurized oil that is alternately drawn out from the left and right chambers of the intermittent feed cylinder and is led out via the second pilot operating valve to the first pilot operating valve. In the grindstone head intermittent feeding device, the grinding wheel head is equipped with a manually operated valve having three ports, one at the left end, one at the right end, and a notch at both ends for guiding the grinding wheel to the first pilot operating valve. A drain port is provided to release the pressure oil pumped from the table to the low pressure side, the traverse end is confirmed on the table, and the first pilot operating valve is switched to the pressure oil supply port only at the table traverse end based on this confirmation signal. An intermittent feeding device for a grindstone head, characterized in that it is provided with a switching control means.