JPH0226618Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention allows the front cover of the grinding wheel and the grinding fluid nozzle to be moved together to adjust the appropriate position as the diameter of the grinding wheel decreases, and the operation when replacing the grinding wheel is easy. The present invention relates to a grinding wheel front cover and a grinding fluid nozzle moving mechanism.

Prior Art The gap between the outer periphery of the grinding wheel and the front cover and the position of the discharging outlet at the tip of the grinding fluid nozzle must be adjusted in response to the reduction in the number of grinding wheels. Mechanisms for manually performing this adjustment include a mechanism in which the front cover with the nozzle is moved by manually rotating the feed screw as in Utility Model No. 55-142254, or
As in No. 59-3794, a mechanism is used in which the front cover and the nozzle are separately engaged with a screw shaft and moved together by manual rotation of the screw shaft. In the case of automatic adjustment, there is a method of moving the front cover using a hydraulically driven direct-acting ratchet mechanism as in Japanese Utility Model Application No. 120762/1980, or a method of moving the front cover using a hydraulically driven ratchet mechanism as in Japanese Utility Model Application No. 55-142255. The method used is to turn the feed screw using the device and move the front cover. Also, when replacing the grinding wheel, it is necessary to move the front cover relatively large, so as in Utility Model Application No. 60-125057, the rotary handle of the movable feed screw is removed and the front cover is left with the feed screw screwed into the nut of the grinding wheel cover body. Either cut the edge of the wheel and pull out only the front cover toward you, or remove the pin that connects the screw shaft and the front cover, cut the edge, and rotate the front cover as shown in Utility Model Publication No. 59-40998. Some create space.

Problems that the invention aims to solve Even with this type of moving mechanism, there are no measures in place when the diameter of the grinding wheel approaches its usage limit or when the grinding wheel needs to be replaced due to the workpiece.
In order to move the grinding wheel front cover and the grinding fluid nozzle by a relatively large distance, the feed screw must be manually turned many times, which is a very difficult task. Jitsukai 1986
In the mechanism of No. 125057, the retraction distance when replacing the grindstone can be taken by rapid movement, but the handle must be removed at this time, and there is no countermeasure for the grinding fluid nozzle. Furthermore, in the mechanism of Utility Model Publication No. 59-409988, when the grinding wheel is replaced with a larger diameter one, the screw shaft must be rotated a considerable number of times in order to engage the pin.

Means for Solving the Problems A grinding method in which a grinding wheel front cover 33 is rotatably supported by a hinge pin 32 above the front part of a grinding wheel cover that surrounds the grinding wheel 1, and a grinding fluid is discharged to the front surface of the outer periphery of the grinding wheel 1. A feed screw 7 having a liquid nozzle 29, a right-hand screw 7b for moving the front cover, and a left-hand screw 7c for moving the grinding liquid nozzle in the first half and the second half.
A movable member that moves together with the front cover 33 and the grinding fluid nozzle 29 is provided so as to be pivotable about a shaft perpendicular to the screw axis, and the front lower threaded portion and the rear upper threaded portion of the shaft are respectively cut out to form the right-hand thread. and two sets of locking nuts 38A, 38B screwed onto the left-hand thread.
and a drive device 8 for driving the feed screw 7.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In a cylindrical grinding machine, a grindstone cover main body 2 that covers the periphery of a grindstone 1 is fixed to the side surface of a grindstone head (not shown), and a moving device 3 is connected to the top surface of the grindstone cover main body 2.
A frame body 5 is fixed with bolts 6. Holes 5c and 5d are bored in the front frame 5a and rear frame 5b of the frame body 5 at right angles to the center of rotation of the grindstone, and a feed screw 7 is rotatably inserted into the holes 5c and 5d. The feed screw 7 has a right-hand thread 7b on the front side and a left-hand thread 7c on the rear side across the collar 7a in the center, and the tip of the right-hand thread 7b side is formed into a square shaft, and a hand handle 8 is detachably provided. ing. Furthermore, a one-way clutch 10 is provided with a spline at the tip of the left-hand screw 7c, and a round handle 9 is movably inserted into the small diameter portion 9a of the round handle 9.
A gear 11 is fitted through the hole. The gear 11 is removably engaged with a rack 14 formed on a piston 13 that is inserted into a cylinder 12 that is perpendicular to the axis of the feed screw 7 that is fixed to the end surface of the rear frame 5b. The cylinder 12 has a flow passage 12
a, 12b are provided, and the solenoid valve 15 has oil passages 17, 1
8, and further connected to the solenoid valve 15 is a pump P.
An oil passage 19 for supplying pressure oil from the tank T and a return oil passage 20 to the oil tank T are connected. A stroke adjustment bolt 16 is provided on one end surface of the cylinder 12 concentrically with the cylinder 12, and the tip of an integral piston rod 13a provided on one side of the piston 13 is fixed to the frame 5 with a mounting bracket (not shown). It comes into contact with a detection limit switch LSI and sends a feed confirmation signal to a control device (not shown). A guide rod 21 is inserted directly below and parallel to the feed screw 7 into holes 5e and 5f bored in the frame 5, and is fixed by a set screw 22. Furthermore, the guide rod 21
The grinding fluid transfer pipe 23 is parallel to the lower frame 5g.
The bracket 24 fixed to the rear frame 5b is fitted into the center hole of the flanged bush 25 which is fitted into the hole 5h drilled in the rear frame 5b, and the rotation stopper 2 is inserted at right angles to the center hole.
6 is provided, and its tip engages with a keyway bored in the axial direction of the grinding fluid transfer pipe 23, so that it can move only in the axial direction. At the tip of the movable pipe 23, a grinding nozzle 29 equipped with a mechanism capable of turning in the radial direction and the front-rear direction around the center of the pipe is connected to the discharge port 29.
It is installed with the side a facing down. Also moving pipe 2
A grinding fluid hose 30 is fitted to the rear end of the grinding fluid hose 3, so that grinding fluid is supplied from a grinding fluid pump (not shown). A front cover 33 is pivotally supported by a hinge pin 32 provided at the front of the upper surface of the grindstone cover body 2 and is pivotable. The front cover 33 includes an arm 34 having an elongated hole 34a in the upper part, and the movable piece 3
A pin 35 implanted in the side surface of the movable piece 37 engages with the elongated hole 34a and is rotated by the movement of the movable piece 37. The moving piece 37 has a rectangular shape, with a guide hole 37a bored in the center and a U-shaped guide groove 37b in the lower part.
is provided parallel to the guide hole 37a, the guide rod 21 is movably fitted into the hole 37a, and the guide groove 37b spans the outer periphery of the moving pipe 23 to serve as a guide.
A groove 37c is provided in the upper part of the moving piece 37 parallel to the guide hole 37a, a hole 37d is bored perpendicular to the groove 37c, and a rectangular block-shaped locking nut 38A is formed.
is provided. The locking nut 38A has an integral pivot shaft 38a at the center of both sides thereof, and is fitted into a hole 37d so as to be freely pivotable. As shown in FIG. 4, the female threaded portion screwed into the locking nut 38A and the right-hand thread 7b of the feed screw 7 has R-shaped groove notches 38b, 3 symmetrically and diagonally to the left and right of the pivot shaft 38a.
8c is provided, and the threads are omitted by these notches 38b and 38c. A turning knob 39A is fitted to one end of the turning shaft 38a, and when the knob 39A is turned counterclockwise, the unscrewing nut 39A avoids the outer circumference of the thread of the feed screw 7 and is unscrewed. It's getting old. Also provided is a safety pin 41A whose tip engages at right angles with the inclined bottom surface 38d of the locking nut 38A to prevent it from turning when the locking nut 38A is in a screwed state. The safety pin 41A is fitted into a hole 40a of a rectangular seat 40 fixed to the side surface of the movable piece 37 and a hole 37e of the coaxial movable piece 37, as shown in FIG. A female screw 42 for preventing rotation is provided in the square seat 40 at right angles to the hole 40a, and the small diameter portion of the tip is engaged with a keyway 41a drilled in the safety pin 41A, so that the safety pin 41A can only move in the axial direction. It is said that Furthermore, a steel ball 4 is inserted into a hole drilled at right angles to the hole 40a on the opposite side of the set screw 42 of the square seat 40.
3 is inserted and urged to protrude freely by the spring 44, and is pressed into contact with the V-shaped recess provided in the safety pin 41A, so that the safety pin 41A is locked in the state in which the locking nut 38A is screwed. ing. Furthermore, a hanging fitting 45 is attached to a pin 48 provided on the end surface of the large diameter part of the pivot shaft 38a of the locking nut 38A.
is pivoted with the tip facing downward. The hanging fitting 45 has an elongated hole 45a into which the round boss 40a of the square seat 40 is inserted, and the tip of the arm part is bent and suspended outside the notch 5i of the front frame 5j. When the screw is unscrewed, the tip is pushed down by the pin 48 and interferes with the upper surface of the lid 46 of the grindstone cover main body 2, which is opened by a hinge (not shown) when replacing the grindstone 1, preventing the lid 46 from closing. It is considered a safety device.
The moving piece 47 for moving the grinding liquid nozzle has almost the same shape as the moving piece 37 for the front cover, and only the lower part is different. There is a moving pipe 23 at the bottom of the moving piece 47.
A shift pawl 47b is provided which engages with a groove 23a provided in the center of the shaft, so that as the moving piece 47 moves, the grinding fluid pipe 23 is moved in the axial direction. The locking nut 38B and turning knob 39B provided at the top of the moving piece are 38A and 39
The same one as A is used, and the safety pin 41B is also provided in the same way.

Function When the grinding time of the NC grinding machine during grinding reaches a predetermined time set in the NC device, dressing is performed according to a command from the NC device. When the number of dressings overlaps and the cumulative amount of dressing reaches a predetermined amount set in the NC device, for example, when the outer diameter of the grinding wheel decreases by 0.5 mm, the solenoid valve 15 is activated by a command from the NC device.
The pressure oil from the pump P passes through the oil passage 18 and the flow passage 12b to the cylinder 12.
The piston 13 is moved, and the gear 11 is turned through the rack 14 to be used as a transmission side, while the feed screw 7 is rotated through the clutch 10. The locking nut 38A screwed onto the right-hand screw 7b moves forward, and the arm 34 of the front cover moves forward via the moving piece 37 and pin 35, and the front cover 33 pivots to remove the grindstone 1 by the amount of outer diameter reduction due to dressing. approach the outer periphery of. At the same time, the locking nut 38B screwed into the left-hand thread 7c retreats, and the discharging port 2 of the grinding liquid nozzle 29 is moved through the moving piece 47 and the grinding liquid transfer pipe 23.
Grinding wheel 1 by the amount of outer diameter reduction resulting from dressing 9a.
close to the outer periphery of the In this way, the front cover 3
3 and the gap between the grinding fluid nozzle 29 and the grinding wheel 1 are connected and moved, and gap adjustment is automatically performed.

Next, the solenoid valve 15 is switched in accordance with a command from the NC device, and pressure oil is supplied to the cylinder 12 from the oil passage 17 and the passage 12a, and the piston 13 is supplied to the cylinder 12 from the passage 12a.
A is supplied to the cylinder 12, the piston 13 moves, and the gear 11 is rotated in the opposite direction via the rack 14. At this time, since the one-way clutch 10 is in the idling side, the feed screw 7 is not rotated and only the piston 13 is returned, and the tip of the piston 13 contacts the LSI and a movement confirmation signal is sent to the NC device to continue grinding. Processing continues. As dressing is performed many times, the diameter of the grinding wheel gradually becomes smaller, and when the diameter of the grinding wheel reaches the limit of its usable range, the grinding wheel is replaced. The grindstone is replaced after turning off the power source of the grinder and confirming that the rotation of the grindstone has completely stopped.The grindstone cover lid 46 is opened and the safety pin 4 of the connection moving device 3 is replaced.
1B is pulled out, the turning knob 39B is turned counterclockwise, and the removal nut 38B is turned to release the threaded portion and become free, and the nozzle 29 is manually pulled forward. Next, safety pin 41A
is pulled out, the turning knob 39A is turned counterclockwise, the removal nut 38A is turned and becomes free, and the tip of the front cover 33 is manually turned upward to create a space necessary for replacing the grindstone.

When the whetstone 1 is replaced with a new one, the tip of the front cover 33 is manually approached to the outer periphery of the whetstone, adjusted to an appropriate gap, and the turning knob 39A is turned clockwise to be screwed into the right-hand screw 7b. To adjust the poor engagement due to thread misalignment during screwing, pull out the round handle 9 backwards to disengage the gear 11 and the rack 14, and slightly turn the hand handle 8 that is freely removable at the tip of the feed screw 7. By rotating the screws, the screws can be screwed together smoothly. When the feed screw 7 and the locking nut 38A are completely screwed together, the safety pin 41A is pushed in and the screwing is locked. The tip of the hanging fitting 45, which is pivotally supported by a pin 48 provided on the end face of the large diameter part of the pivot shaft 38a of the locking nut 38A, is pushed down with the threaded engagement locked, so that the lid 46 of the grindstone cover can be closed. It becomes a state. Next, the discharge port 29a of the grinding fluid nozzle 29 is also manually pushed in to adjust the gap with the grinding wheel, the turning knob 39B is turned clockwise, the left-hand screw 7c is engaged, the nut 38B is screwed in, and the safety pin 41B is pushed in and screwed. The grindstone is locked, the grindstone cover lid 46 is closed, and the grindstone replacement is completed.

Effects As detailed above, the present invention achieves dressing by simultaneously moving the grinding wheel front cover and the grinding fluid nozzle by an equal amount using a single feed screw with a right-hand thread and a left-hand thread that is rotated by fluid pressure drive. The gap is automatically adjusted according to the amount of reduction in the grinding wheel, and the nut for moving the front cover of the grinding wheel and the nut for moving the grinding fluid nozzle are each provided with a turning axis perpendicular to the screw axis, making it possible to turn them, making them symmetrical with respect to the center of rotation. In addition, a notch with an R-shaped groove is provided diagonally so that the screw thread can be set or removed by turning the axis perpendicular to the threaded axis of the nut, making it easy to move quickly when replacing the grinding wheel. It has the advantage of greatly shortening the time required to change the grinding wheel, and in particular, it enables quick setup changes for NC grinding machines that handle workpieces of various shapes and require frequent grinding wheel changes, which has a significant effect on improving efficiency. have

[Brief explanation of the drawing]

Fig. 1 is a horizontal cutaway view of the present invention, Fig. 2 is a cutaway view taken along the line A-A in Fig. 1, Fig. 3 is an explanatory cutaway view of the fluid pressure drive device, and Fig. 4 is an enlarged cutaway of the locking nut. FIG. 5 is an enlarged cutaway view of the safety pin portion of the locking nut. 1...Whetstone, 7...Feed screw, 8...Hand-cranked handle, 9...Round handle, 29...Grinding fluid nozzle, 37...Movement piece for front cover, 38A, 38B
...Release nut, 47...Movement piece for grinding fluid nozzle, P...Pump, T...Oil tank.

Claims (1)

[Scope of utility model registration request] A grindstone front cover pivotably supported by a hinge pin above the front part of the grindstone cover that surrounds the grindstone, a grinding liquid nozzle that discharges grinding liquid to the outer periphery of the grindstone, and a right-hand screw for moving the front cover. and a feed screw having a left-hand thread for moving the grinding liquid nozzle carved in the first half and the second half, and a moving member that moves together with the front cover and the grinding liquid nozzle, the shaft being rotatable about a shaft perpendicular to the screw axis. The front lower threaded part and the rear upper threaded part are cut out, respectively, and includes two sets of locking nuts screwed into the right-hand thread and the left-hand thread, and a drive device for driving the feed screw, and when replacing the grinding wheel. A mechanism for connecting and moving a grinding wheel front cover and a grinding liquid nozzle, characterized in that the front cover and the grinding liquid nozzle can be rapidly moved by unscrewing the screw by rotating a locking nut about a right-angled axis.