JPS5852789B2 - Toishi Gourmano Truing Dressing Souch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for truing and dressing a grinding wheel using a hard material such as cubic boron nitride as abrasive grains.
An object of the present invention is to provide a highly efficient truing and dressing device.

Conventionally, when truing and dressing a grinding wheel with a cubic boron nitride abrasive grain layer fixed to the outer periphery of a base ring, a rod-shaped truing tool with embedded diamond abrasive grains is first fixed on a table, for example, and the table is traversed. The outer periphery of the grinding wheel was being trued.

However, the peripheral speed of the grinding wheel during normal grinding work (45 m/
It has been experimentally found that if the above-mentioned true ink is performed at a temperature of about 100 mm (see), vibrations will occur in the truing tool, making highly accurate truing impossible.

Therefore, conventionally, the circumferential speed of the grinding wheel for truing had to be reduced to about 25 m/see, which not only made the truing work complicated, but also complicated the rotational drive device of the grinding wheel. Ta.

Furthermore, after truing, a worker presses a bar-shaped dressing tool containing alumina abrasive grains onto the outer periphery of the grinding wheel to dress the grinding wheel, but there is a problem in that safety and work efficiency are extremely poor.

The present invention has been made in order to eliminate such conventional problems. Diamond abrasive grains and bird metal grains are alternately sintered with copper alloy at predetermined intervals on the outer peripheral surface of a disc-shaped base. The tool is rotated to reduce the peripheral speed relative to the grinding wheel, and after the rotating tool trues the grinding wheel, free abrasive grains are supplied between the rotating tool and the grinding wheel to dress the grinding wheel. The gist of this is that

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a grinding wheel in which abrasive grains of a hard material such as cubic boron nitride are adhered to the outer peripheral surface of an aluminum disk in a layered manner, and is rotated at high speed clockwise in FIG.

Reference numeral 2 denotes a rotary tool, and this rotary tool 2 has diamond abrasive grains 4 and grains 5 of vine metal such as tungsten, tungsten carbide, and steel at predetermined intervals on the outer peripheral surface of a disc-shaped base 3 made of an aluminum alloy. It has a structure in which these are alternately sintered with copper alloy 6.

These sintered bodies are made by sintering, by way of example, 15% of No. 70 diamond abrasive grains with the remaining weight percent of the copper alloy, and 15% of hard metal particles approximately 3 microns in diameter with the remaining weight percent of the copper alloy. The composition should be

Reference numeral 7 denotes a tool support body that rotatably supports the rotary tool 2 facing the grinding wheel 1. The tool supporting body 1 is mounted on a traverse table 8 so as to be movable forward and backward relative to the grinding wheel 1.

Reference numeral 9 denotes a motor fixed on the tool support I, which drives the rotary tool 2.
is rotated counterclockwise by this motor 9 via a pulley and a belt 1, so that the relative circumferential speed with respect to the grinding wheel 1 is reduced.

A feed screw shaft 10 is screwed into the tool support 7 and rotatably supported on the traverse table 8.

A pinion 11 is freely rotatably supported on the feed screw shaft 10, and a pawl 13 pivotally supported on a rotating plate 12 fixed to the pinion 11 engages and disengages from a rook 14 keyed to the feed screw shaft 10. They are freely screwed together.

Therefore, when the pinion 11 is rotated by the operation of the rack piston 15, the feed screw shaft 10 is rotated through the pawl 13 and the rook 14.
is rotated forward, and the tool support 7 is moved forward by a predetermined amount.

A feeding device 16 for feeding the rotary tool 2 is constituted by the pinion 11, pawl 13, rook 14, rack piston 15, and the like.

Further, a pinion 17 is freely rotatably supported on the feed screw shaft 10, and a rotating plate 18 is fixed to the pinion 17.
A pawl 19 pivotally supported is releasably engaged with a rook 20 keyed to the feed screw shaft 10.

Therefore, when the pinion 17 is rotated by the operation of the rack piston 21, the feed screw shaft 10 is rotated through the pawl 19 and the rook 20.
is rotated in the opposite direction, and the tool support 7 is moved backward by an appropriate amount.

The pinion 17, pawl 19, rook 20, rack piston 21, etc. constitute a gap providing device 22 that forms a gap of an appropriate size between the rotary tool 2 and the grinding wheel 1.

The amount of advance given to the tool support 7 by the feeding device 16 is greater than the amount of retreat given by the gap providing device 22 by the amount of feed for girding the rotary tool 2 onto the grinding wheel 1.

The traverse table 8 is placed on a base 23 so as to be slidable in a direction parallel to the axis of the grinding wheel 1, and is reciprocated by a cylinder device 24.

25 is a nozzle that supplies dressing liquid to the gap,
As shown in FIG. 1, this nozzle 25 is arranged so as to supply the dressing liquid from the inside of the disc-shaped base 3 constituting the rotary tool 2 toward the gap.

As shown in FIGS. 3 and 4, an annular groove 26 is formed on one end surface of the disc-shaped base 3, and an annular groove 26 is formed in the radial direction of the sintered body portion of the hard metal particles 5. A spout 27 opening into the annular groove 26 is provided, respectively.

Therefore, the dressing liquid supplied from the nozzle 25 is forcefully supplied to the gap from the spout 27 due to the action of centrifugal force as the rotary tool 20 rotates.

The nozzle 25 is connected via a pump P to a tank 28 in which a dressing liquid is stored, and the dressing liquid, for example, contains about 500 f of free abrasive grains 29 (diameter about 100 μm) such as alumina or silicon carbide with respect to the grinding liquid 101. It is assumed that they are mixed.

Reference numeral 30 denotes a stirring blade 30 that prevents separation of the grinding fluid and the free abrasive grains 29, and is rotationally driven by a motor 31.

In the gap, the spout 27 is connected to the sintered part of the hard metal grains 5 so that the sintered part of the hard metal grains 5 actively backs up the free abrasive grains 29 over a long distance. It is drilled at a position offset to the front in the direction of rotation.

Next, the above-mentioned in-tub operation will be explained based on the electric circuit shown in FIG.

When the truing/dressing command is sent, the motor 9 is activated to rotate the rotary tool 2, the contact 32 is closed, the relay CRI is energized, the feeding device 16 is activated, and the tool support is rotated. 7 is moved forward by a predetermined amount, and the rotary tool 2 is given feed for truing with respect to the grinding wheel 1.

The traverse table 8 is reciprocated by the cylinder device 24 based on the operation completion signal of the feeding device 16, and the grinding wheel 1 is trued by the rotary tool 2.

When the traverse stirrup 8 reciprocates and returns to its original position, a truing completion signal is sent, contact 33b is opened, relay CR1 is deenergized, and contact 33a is closed and relay CR2 is energized.

The biasing of this relay CR2 activates the gap providing device 22 to move the tool support 7 backward, and a gap of an appropriate size smaller than the outer diameter of the free abrasive grains 29 is created between the rotary tool 2 and the grinding wheel 1. is formed, and at the same time, the pump P is activated and the dressing liquid is jetted out through the nozzle 25 and the spout 27.

The traverse table 8 is reciprocated by the cylinder device 24 based on the operation completion signal of the gap providing device 22, and the free abrasive grains 29 supplied to the gap during this time are sintered from the hard metal grains 5 of the rotary tool 2. The bond (metal or synthetic resin) that is backed up by the part and holds the abrasive grains of the grinding wheel 1 is scraped off by spraying, and the abrasive grains are made to protrude from the pound to dress the grinding wheel 1.

When the traverse table 8 reciprocates and returns to its original position, a dressing completion signal is sent, the contact 34b is opened, the relay CR2 is deenergized, and the truing and dressing of the grinding wheel 10 is completed.

In the above embodiment, the dressing liquid is transferred to the rotary tool 2.
The free abrasive grains 29 are actively backed up by the sintered part of the hard metal grains 5 by supplying them to the gap from the inside of the nozzle 25 through the spout 27. Even if the dressing liquid is supplied hanging above the gap, the loose abrasive grains 29 are backed up by the sintered part of the hard metal grains 5, and dressing can be performed in substantially the same manner as described above.

Further, in order to perform dressing with free abrasive grains as in the above embodiment, it is not necessary to move the rotary tool 2 toward the grinding wheel 1 so that a gap is formed between the rotary tool 2 and the grinding wheel 1, and move the rotary tool 2 relatively backward. It is not necessary to do so, and the relative position of the rotary tool 2 with respect to the grinding wheel 1 may be set so that the amount of retreat is zero and the gap is zero.

As described in detail above, according to the present invention, the rotary tool is rotated so as to reduce the relative circumferential speed with the grinding wheel, and after the rotary tool is fed and the grinding wheel is trued, the rotary tool and the grinding wheel are Since the grinding wheel is dressed by supplying free abrasive grains between the grinding wheel and the wheel 1, high-precision true ink can be produced without vibration during truing, and the free abrasive grains are automatically supplied. Therefore, there is no need to rely on manual dressing, which greatly improves safety and work efficiency.

Furthermore, since the present invention uses a rotating tool in which diamond abrasive grains and hard metal grains are alternately sintered with copper alloy at predetermined intervals on the outer peripheral surface of a disc-shaped base,
A single rotary tool can be used as both a true ink tool and a dressing tool, thereby reducing the space it occupies.Moreover, only one device is required to move the rotary tool forward relative to the grinding wheel, making the configuration simple. becomes.

[Brief explanation of the drawing]

FIG. 1 is a side view of the truing and dressing device for a grinding wheel according to the present invention, FIG. 2 is a view taken in the I direction of FIG. 1, FIG. 3 is a partially enlarged view of the rotary tool, and FIG. Figure IV-
FIG. 5 is an explanatory view showing the dressing state, and FIG. 6 is an electric circuit diagram. 1... Grinding wheel, 2... Rotary tool, 3.
... Disk-shaped substrate, 4 ... Diamond abrasive grains, 5 ... Note metal grains, 6 ...
...Copper alloy, 7...Tool support, 9...
・Motor (rotary drive device), 16... Feeding device, 22... Gap providing device, 25...
・Nozzle, 27... Spout port, 29...
Free abrasive grains, P... Pump (dressing liquid supply device).

Claims (1)

[Claims] 1 A truing/dressing device is used that uses a grinding wheel made of hard material such as cubic boron nitride as abrasive grains while rotating at high speed. a rotary tool in which grains are alternately sintered with a copper alloy, and a tool support that rotatably supports the rotary tool facing the grinding wheel and can move forward and backward relative to the grinding wheel. , a rotary drive device that rotates the rotary tool so as to reduce a relative circumferential speed between the rotary tool and the grinding wheel; The present invention is characterized by comprising a feeding device that moves relatively forward toward the grinding wheel, and a device that supplies free abrasive grains between the rotating tool and the grinding wheel in order to dress the grinding wheel that has been trued. Grinding wheel truing and dressing equipment.