JP4518254B2 - A grindstone that prevents the side-associated air layer from entering the outer peripheral grinding surface - Google Patents

Description

   The present invention relates to a grindstone capable of satisfactorily supplying coolant to a grinding point in a grinder that grinds a workpiece with a grindstone.

Conventionally, in a grinding machine that grinds a workpiece with a grindstone that rotates at a high speed, as described in Patent Document 1, a coolant is reliably supplied to a grinding point by blocking an air layer that rotates around the grindstone. In addition, the pressure of the coolant is increased and the coolant is supplied from the nozzle to the grinding point where the grinding wheel grinds the workpiece at high speed. A right angle nozzle method is used in which the outer surface is sprayed at a right angle.
JP 2004-66411 A (first page, FIGS. 7 and 8)

  In a cylindrical grinder, a cam grinder, or the like that grinds a workpiece with a grindstone that rotates at high speed, the width of the grindstone to be used is determined according to the width of the workpiece. For example, in the case of a cam grinder, the grindstone width is determined to be about 2 mm wider on both sides than the width of the cam to be ground.

  The flow of the air layer that rotates around the outer peripheral grinding surface of the rotating grinding wheel is part of the side-associated air layer that flows along the side surface of the grinding wheel from the center to the outer periphery. The inventor has found that the flow velocity is increased to prevent the coolant from reaching the grinding point. In particular, when the grinding wheel peripheral speed is increased to 120 m / sec or higher in order to increase the grinding efficiency, the flow of the air layer from the side of the grinding wheel is greatly transmitted at both ends of the grinding wheel width direction on the outer peripheral grinding surface, and the coolant is transferred to the grinding point. For example, grinding burn may occur at both ends of the tangential portion of the cam where it becomes difficult to reach and the amount of grinding increases.

  The right angle nozzle system that shuts off the air layer that rotates around the grinding surface of the grinding wheel with coolant, wraps the coolant around the grinding surface of the grinding wheel, and leads it to the grinding point, the smaller the grinding wheel width, the more the air layer flows from the side of the grinding wheel. The influence becomes large, and it becomes difficult for the coolant to wrap around the outer peripheral grinding surface and to reach the grinding point. In the high-pressure coolant system, the coolant is supplied to the grinding point at a high pressure, which increases the amount of coolant supplied, increases the size of the high-pressure pump and coolant tank, increases the equipment cost, and increases the amount of coolant consumption and power consumption. There was a problem that the maintenance cost increased.

  The present invention has been made to solve such a conventional problem, and prevents the air surface accompanying the side surface of the grindstone rotating around the side surface of the grindstone rotating at high speed from flowing into the outer peripheral grinding surface, thereby ensuring the coolant at the grinding point. Is to supply.

In order to solve the above-mentioned problem, the structural feature of the invention described in claim 1 is that the work is carried out by relatively moving a grindstone rotatably supported on a grindstone table and a work piece supported by a work piece supporting device. In a grindstone mounted on a grinding machine that grinds an object while supplying coolant to the grinding point by the grindstone,
The grindstone is
A disc-shaped grinding wheel core ,
A plurality of grindstone chips bonded to the outer circumferential surface of the grindstone core to form an outer circumferential grinding surface ;
A side-associated air layer that protrudes radially outward of the grindstone core over the entire circumference on both outer sides in the width direction of the grindstone chip on the outer circumferential surface of the grindstone core, and rotates with the side surface of the grindstone core A blocking wall for blocking the wrap around the outer peripheral grinding surface ;
It is to provide.

The structural feature of the invention according to claim 2 is that, in claim 1, the outer diameter of the blocking wall is set larger than the outer diameter of the grindstone tip .

The structural feature of the invention according to claim 3 is that, in claim 1 or 2, the blocking wall is formed with respect to the grindstone chip so that a space is formed between the blocking wall and the grindstone chip. It is spaced apart in the width direction of the outer peripheral surface of the grindstone core .

   In the invention according to claim 1 configured as described above, when the workpiece is ground by the grindstone while supplying the coolant to the grinding point, the side-associated air layer that rotates around the grindstone core side surface is the outer periphery of the grindstone core. It is blocked | interrupted to the outer periphery grinding | polishing surface by the interruption | blocking wall projected over the perimeter on the surface in the width direction both sides of the grindstone chip. Thereby, a part of the side-associated air layer does not go around the outer peripheral grinding surface and increase the flow velocity of the outer peripheral-associated air layer, and the coolant can be reliably supplied to the grinding point.

  The grindstone G that prevents the side-associated air layer according to the first embodiment of the present invention from entering the outer peripheral grinding surface will be described below with reference to FIGS. A grinding wheel base 12 is slidably mounted on the bed 11 of the grinding machine 10 on which the grinding wheel G is mounted, and is moved forward and backward in the X-axis direction by a servo motor 13 via a ball screw mechanism. A grindstone shaft 14 having a grindstone G attached to its tip is rotatably supported on the grindstone base 12 and is rotationally driven by a motor. The grindstone G is configured by adhering a plurality of grindstone chips 16 to an outer peripheral surface 26 of a disc-shaped grindstone core 15 formed of a metal such as iron or aluminum. The outer peripheral surfaces of the plurality of grindstone chips 16 form the outer peripheral grinding surface Ga of the grindstone G for grinding the workpiece W. A grindstone cover 17 that covers the grindstone G is fixed to the grindstone base 12. A coolant nozzle 19 of a coolant supply device 18 is attached to the grindstone cover 17, and coolant is supplied from the coolant nozzle 19 toward the grinding point P where the grindstone G grinds the workpiece W or the workpiece W. A table 20 is slidably mounted on the bed 11, and is moved by a servo motor 21 through a ball screw mechanism 22 in the Y-axis direction perpendicular to the X-axis. A spindle stock and a tailstock 24 constituting the workpiece support device 23 are mounted on the table 20, and the workpiece W is sandwiched between both centers of the spindle stock and the tailstock 24 and is driven to rotate. A dresser 28 is attached to the side surface of the tailstock 24 on the side of the grindstone 12, and the dresser 28 dresses the outer peripheral grinding surface Ga of the grindstone G by relative movement between the grindstone base 12 and the table 20 by the servo motors 13 and 21. It has become.

   On the outer peripheral edge portions of both side surfaces 15a and 15b of the disc-shaped grindstone core 15 in which the grindstone chip 16 is bonded to the outer peripheral surface 26, a taper portion that is widened from the thin width portion 25 toward the outer peripheral edge is provided. The width of the outer peripheral surface 26 is formed wider than the width of the grindstone tip 16 by the tapered portion. The width of the grindstone core 15 is widened only at the outer peripheral edge portion to reduce the weight. On the outer peripheral surface 26 of the grindstone core 15, a blocking wall 27 protrudes over the entire circumference on both outer sides in the width direction of the grindstone chip 16. The outer diameter of the blocking wall 27 shown in FIG. 2 is slightly larger than the outer diameter of the grindstone tip 16, but it may be the same diameter or slightly smaller.

  The operation of the first embodiment configured as described above will be described. The workpiece W is sandwiched between the center of the headstock and the tailstock 24 and rotated. The grindstone table 12 is advanced by the servo motor 13 and the workpiece W is ground by the grindstone G rotated at high speed, for example, at a grindstone peripheral speed of 160 m / sec. A grindstone Gs in which a grindstone chip 32 having the same width as the grindstone core 31 is bonded to the outer circumferential surface of a disc-shaped grindstone core 31 whose both side surfaces 31a and 31b are flat as shown in FIG. 3 rotates at a grindstone peripheral speed of 160 m / sec. In this case, the flow of the air layer 37 that rotates around the outer peripheral grinding surface Ga is rotated along the both side surfaces 31a and 31b of the grinding stone core 31 along the both side surfaces 31a and 31b of the grinding stone core from the center of the grinding stone toward the outer periphery. A part of the flowing side-associated air layer 33 is transmitted to the outer peripheral grinding surface Ga to increase the flow velocity, and the velocity of the outer peripheral air layer 34 that rotates around the outer peripheral grinding surface Ga is measured with a Pitot tube. Thus, both ends of the grindstone grinding surface Ga are considerably higher than the central portion.

   In the present embodiment, the grindstone core 15 is formed such that the width of the outer peripheral surface 26 is wider than the width of the grindstone chip 16, and the blocking walls 27 protrude from the outer peripheral surface 26 over the entire circumference on both outer sides in the width direction. Therefore, the blocking wall 27 blocks a part of the side-associated air layer 33 from entering the outer peripheral grinding surface Ga. As a result, a part of the side-associated air layer 33 does not wrap around the outer peripheral grinding surface Ga to increase the flow velocity of the outer peripheral-associated air layer 34, and the coolant supplied from the coolant nozzle 19 is reliably at the grinding point P. Supplied.

Next, a first reference example of a grindstone in which the side-associated air layer is prevented from entering the outer peripheral grinding surface will be described with reference to FIG. The first reference example is that the isolation layer 35 to be removed together with the grindstone chip 16 by the dresser is provided on the outer circumferential surface 26 of the grindstone core 15 over the entire circumference on both sides in the width direction of the grindstone chip 16. Different from the first embodiment. Isolation layers 35 are provided on the outer peripheral surface 26 of the grindstone core 15 over the entire circumference on both sides in the width direction of the grindstone chip 16, and the side-associated air layer 33 wraps around to the outer peripheral grinding surface Ga and the flow velocity of the outer peripheral-associated air layer 34. Can be prevented by the release layer 35. When dressing the outer peripheral grinding surface Ga by the dresser 28, the release layer 35 is also removed by the dresser together with the grindstone tip 16, so that the release layer 35 does not interfere with the dressing operation of the dresser.

Next, a second reference example of a grindstone that prevents the side-associated air layer 33 from entering the outer peripheral grinding surface Ga will be described with reference to FIG. In the second reference example , a tapered portion 29 having a width increasing from the thin width portion 25 toward the outer peripheral surface 26 is formed on the outer peripheral edge portions of the both side surfaces 15 a and 15 b of the grindstone core 15, and the blocking wall 27 is formed on the outer peripheral surface 26. The only difference from the first embodiment and the first reference example is that the separation layer 35 is not provided and the spaces 36 are provided on both sides in the width direction of the grindstone tip 16. The side-associated air layer 33 that rotates around the both side surfaces 15 a and 15 b of the grindstone core 15 is guided by the taper portion 29 in a direction away from the outer peripheral grinding surface Ga of the grindstone chip 16. And even if a part of the side-associated air layer 33 diffuses to the outer peripheral grinding surface Ga side, the space 36 provided on both sides in the width direction of the grindstone tip 16 does not reach the outer peripheral grinding surface Ga, and the coolant nozzle 19 The supplied coolant is reliably supplied to the grinding point P.

The side view which made the cross section of a part of grinding machine equipped with the grindstone which prevented the side accompaniment air layer which concerns on 1st Embodiment from wrapping around an outer periphery grinding surface. The principal part expanded sectional view of the grindstone concerning a 1st embodiment. The principal part expanded sectional view of the grindstone whose both side surfaces are planes. The figure which shows the flow velocity of the outer periphery accompanying air layer of the grindstone shown in FIG. The principal part expanded sectional view which shows a 1st reference example . The principal part expanded sectional view which shows the 2nd reference example .

Explanation of symbols

   DESCRIPTION OF SYMBOLS 10 ... Grinding machine, 11 ... Bed, 12 ... Grinding wheel base, 13, 14 ... Grinding wheel shaft, 15 ... Grinding wheel core, 16 ... Grinding wheel tip, 18 ... Coolant supply device, 19 ... Coolant nozzle, 20 ... Table , 23 ... Workpiece support device, 26 ... Outer peripheral surface, 27 ... Shutting wall, 28 ... Dresser, 29 ... Tapered portion, 33 ... Side-associated air layer, 34 ... Peripheral associated air layer, 35 ... Isolation layer, 36 ... Space, G: Whetstone, Ga: Peripheral grinding surface, W: Workpiece.

Claims (3)

Mounted on a grinder that grinds the workpiece while supplying coolant to the grinding point by the grindstone by relatively moving the grindstone rotatably supported on the grindstone table and the workpiece supported by the workpiece support device. In the whetstone
The grindstone is
A disc-shaped grinding wheel core ,
A plurality of grindstone chips bonded to the outer circumferential surface of the grindstone core to form an outer circumferential grinding surface ;
A side-associated air layer that protrudes radially outward of the grindstone core over the entire circumference on both outer sides in the width direction of the grindstone chip on the outer circumferential surface of the grindstone core, and rotates with the side surface of the grindstone core A blocking wall for blocking the wrap around the outer peripheral grinding surface ;
Grindstone, characterized in that it comprises a. In claim 1,
The grindstone characterized in that an outer diameter of the blocking wall is set larger than an outer diameter of the grindstone tip. In claim 1 or 2,
The grindstone characterized in that the barrier wall is spaced apart from the grindstone chip in the width direction of the outer peripheral surface of the grindstone core so that a space is formed between the barrier wall and the grindstone chip.

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