JPH061322Y2 - Grinding fluid supply device for centerless grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a grinding fluid supply device for a centerless grinding machine, and more specifically to a grinding fluid supply device mainly for preventing clogging of a grinding wheel.

[Conventional technology]

The general structure of this type of grinding fluid supply device is that the coolant nozzle is arranged downward at the upper position of the workpiece,
The grinding fluid is supplied from this nozzle to the grinding part of the workpiece.

[Problems to be solved by the device]

By the way, in such a grinding fluid supply device, a sufficient cooling effect can be expected by appropriately adjusting the amount of the grinding fluid supplied to the workpiece being ground, but on the other hand, the effect of preventing clogging of the grindstone is not achieved. There was little hope and improvement was requested.

That is, the clogging of the grindstone occurs because the grinding layer generated by grinding the workpiece sticks and accumulates on the grinding surface of the grinding wheel due to its high temperature. It is possible to prevent adhesion to the ground surface and further prevent clogging of the grindstone.

However, in the structure as described above, the grinding fluid from the nozzle is jetted in the same direction as the rotation direction of the grinding wheel, that is, in the direction in which the grinding wheel rotates, so that most of the jetted grinding fluid is the grinding portion. To flow or scatter in the axial direction (feed direction) of the workpiece. As a result, the grinding waste generated on the downstream side of the workpiece in the rotating direction of the grinding wheel is not sufficiently supplied with the grinding fluid, and the cooling effect of the grinding waste is hardly expected.

As a result, grinding debris adheres and accumulates on the grinding surface of the grinding wheel, resulting in clogging of the grinding wheel.As a result, grinding efficiency decreases, grinding resistance increases, or significant heat is generated, and Peeling, burning, chattering, etc., were generated on the finished surface of, and the grinding accuracy was adversely affected. Such problems caused by the clogging of the grindstone often occur particularly in the grindstone having a small abrasive grain, a dense texture, and a high degree of bonding.

By the way, as this type of grinding fluid supply device, for example,
As disclosed in Japanese Utility Model Laid-Open No. 61-195966, many grinding liquid supply devices have been proposed in the past for the purpose of improving workability, preventing scattering of the grinding liquid, and effectively cooling the workpiece. However, sufficient measures have not yet been taken to prevent clogging of the grindstone in order to keep the grinding work in good condition, and only measures to increase the number of dresses have been taken. Moreover, increasing the dress rotation in this way only mischievously shortened the life of the grindstone.

The present invention has been made in view of such conventional problems, and an object of the present invention is to rapidly cool and remove the grinding debris adhering to the grinding surface of the grinding wheel immediately after grinding to remove the grinding debris. An object of the present invention is to provide a grinding fluid supply device for a centerless grinding machine having a structure for preventing clogging.

[Means for Solving the Problems]

In order to achieve the above object, the grinding fluid supply device of the present invention is
In a centerless grinder that performs circular grinding while grinding a workpiece supported by an adjusting wheel and a workpiece support plate with a grinding wheel, a work rest holding the workpiece support plate has a grinding surface of the grinding wheel. Is provided with an injection nozzle for injecting a grinding liquid, and this injection nozzle is opened to the grinding wheel side abdomen of the work rest, and the grinding liquid injection direction is an acute angle with respect to the rotation direction of the grinding wheel. It is set to.

Here, the grinding liquid jetting direction is an acute angle with respect to the rotation direction of the grinding wheel, and the grinding fluid jetted from the jetting nozzle is directed toward the grinding surface of the grinding wheel at an acute angle with respect to the rotation direction of the grinding wheel. It is injected, in other words, injected in the opposite direction from the downstream side to the upstream side with respect to the rotation direction of the grinding wheel.

[Action]

By spraying the grinding fluid at an acute angle to the grinding surface of the grinding wheel from the injection nozzle opened in the abdomen of the work rest, the high-temperature grinding dust adhering to the grinding surface of the grinding wheel immediately after grinding can be cooled quickly, and Grinding dust deposited or deposited on the surface of the grinding surface after the removal of the abrasive grains, the pores, and the like are forcibly removed and removed by the jetting force of the grinding fluid.

In this case, the jet force is significantly increased by adding the rotational speed of the grinding wheel to the jet force given to the grinding fluid itself.

〔Example〕

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

A centerless grinding machine equipped with a grinding fluid supply device according to the present invention is shown in FIG. 1, and the grinding fluid supply device 10 is mainly for preventing clogging of a grindstone by grinding debris generated during workpiece grinding. Then, between the grinding wheel 1 and the adjusting wheel 2,
It is provided on a work support portion that supports the work W. 8
Shows a conventionally known upper nozzle for cooling the workpiece W. The upper nozzle 8 is arranged downward above the workpiece W and supplies the grinding liquid from above to the workpiece W being ground.

The work support part includes a support plate (work support plate) 3 that supports the work W from below and a work rest 4 that holds the support plate 3. The work support 4 is supported on the top of the work rest 4. The plate 3 is fixedly held by bolts 7.

The work rest 4 is provided with the injection nozzles 5 and 9 of the grinding fluid supply device 10 and the communication hole 6 that supplies the grinding fluid to these injection nozzles 5 and 9. The communication hole 6 is provided in the lower central portion of the work rest 4 so as to extend in the axial direction of the workpiece W (perpendicular to the paper surface) and to communicate with a grinding fluid supply source (not shown). Also,
The jet nozzles 5 and 9 each have a base end communicating with the communication hole 6 and a tip end that is connected to the work rest 4.
The abdomen 4a, 4b is opened.

The first injection nozzle 5 is for the grinding wheel 1, and as shown in FIG. 1, the grinding fluid is directed toward the grinding surface 1 a of the grinding wheel 1,
Holes are drilled so that they are jetted at an acute angle with respect to the rotating direction of the grinding wheel 1. In other words, the injection direction of the grinding fluid is set to be the reverse direction from the downstream side to the upstream side with respect to the rotation direction of the grinding wheel 1 (clockwise in the drawing).

Structural conditions of the first injection nozzle 5 will be described in more detail with reference to FIG.

FIG. 2 is an explanatory view showing the surface of a general grinding wheel 1 in an enlarged sectional view. This grinding wheel 1 has abrasive grains 11 and a binder 1
2 and the pores 13, the outer peripheral surface of the grinding wheel 1, that is, the grinding surface 1a, as shown in the drawing, has a recess 14 after removal of abrasive grains caused by spillage, a recess 15 of pore traces, and a gap between the abrasive grains. A large number of recesses 16 are scattered.

By the way, when the workpiece W is ground, the maximum heat generation temperature at the grinding point is known to exceed 1000 ° C., but the abrasive grains 11 and the binder 12 constituting the grindstone are generally heat Since it is a defective conductor, most of the heat generated by this grinding is transferred to the workpiece W and grinding debris.

In this case, when the grinding liquid is supplied only from the upper nozzle 8 as in the conventional case, the heat of the workpiece W is cooled by the grinding liquid, while the grinding dust immediately after grinding is not sufficiently cooled and remains at a high temperature. Is in the state of. That is, as described above, the grinding dust is generated on the downstream side of the workpiece W in the rotation direction of the grinding wheel 1, but the grinding fluid from the upper nozzle 8 is not sufficiently supplied to this portion, and the cooling is performed. Little effect can be expected.

For this reason, the grinding dust immediately after grinding is in a high temperature state of 700 ° C. to 900 ° C. and is deposited or deposited on the recesses 14 after the removal of the abrasive grains, the recesses 15 of the pore traces or the recesses 16 between the abrasive grains. , Easy to attach. Moreover, after adhering this grinding dust,
Despite the high speed rotation of the grinding wheel 1, the grinding surface 1a can be easily
The result is that the grindstone is clogged.

Therefore, the minimum condition to prevent such clogging of the grindstone is that the high-temperature grinding chips attached to the grinding surface of the grinding wheel are cooled immediately after they are generated, and the grinding surface This is because the grinding dust that has been welded or accumulated in the depressions 4 and 15 of 1a, the recess 16 and the like is immediately released.

From this point of view, the jet nozzle 5 has a structure in which the grinding fluid is jetted at an acute angle to the grinding surface 1a of the grinding wheel 1 on the downstream side of the workpiece W as shown in the drawing. . As a result, the jetting force exerted by the grinding fluid on the grinding surface 1a is significantly increased by adding the rotation speed of the grinding wheel 1 to the jetting force given to the grinding fluid itself.

Further, in the illustrated example, the surface 4c of the work wheel abdomen 4a on the grinding wheel side where the injection nozzle 5 is opened is formed into an arc surface along the grinding surface 1a of the grinding wheel 1. As shown in the figure, the circular arc surface 4c has the circular arc surface 4a.
The radius of curvature of this arc is set to be slightly larger than the radius of curvature of the grinding wheel 1. Then, the injection nozzle 5 is opened in a portion relatively close to the grinding point of the workpiece W on the arc surface 4c. As a result, the arc surface 4c becomes the grinding surface 1 of the grinding wheel 1.
It functions as a covering portion for a, and a narrow injection space is formed between the arc surface 4c and the grinding surface 1a as shown in the figure. As a result, the grinding fluid from the jet nozzle 5 does not scatter to the surroundings, and the grinding surface 1 of the grinding wheel 1 does not scatter.
It is efficiently injected to a, and its cooling effect and injection pressure are exerted more efficiently.

The second injection nozzle 9 is for cleaning the outer peripheral surface 2a of the adjusting wheel 2. As shown in FIG. 1, a hole is drilled so that the grinding fluid is injected toward the outer peripheral surface 2a of the adjusting wheel 2. Has been done. The structural condition of the jet nozzle 9 is not required to be as strict as that of the first jet nozzle 5, and, for example,
The direction of spraying the grinding fluid does not necessarily have to be acute with respect to the outer peripheral surface 2a of the adjusting wheel 2, and is set to be obtuse in the illustrated example.

Incidentally, the specific structure of both the injection nozzles 5 and 9 may be one in which a plurality of holes are arranged side by side in the axial direction of the workpiece W, and a slot is provided in the axial direction of the workpiece W. It may be one.

Then, the grinding fluid supply apparatus 10 configured as described above
In a centerless grinding machine provided with, the workpiece W is fed in a direction perpendicular to the paper surface of FIG. 1, and is supported by the adjusting wheel 2 and the supporting surface of the supporting plate 3 while the outer peripheral surface thereof is the grinding wheel 1. To be ground.

During this grinding, the grinding fluid from the upper nozzle 8 is supplied to the grinding part of the workpiece W to cool the workpiece W, and the clogging of the grindstone is prevented by the grinding fluid supply device 10 of the present invention as follows. To be done.

That is, in the grinding fluid supply device 10, the work rest 4
A grinding fluid is supplied from a grinding fluid supply source (not shown) to the communication hole 6 of the grinding fluid. The grinding fluid is jetted from the jet nozzles 5 and 9 toward the outer peripheral surfaces 1a and 2a of the grinding wheel 1 and the adjusting wheel 2, respectively. It

Then, the grinding fluid from the first injection nozzle 5 is supplied to the grinding wheel 1
Is injected at an acute angle to the ground surface (outer peripheral surface) 1a of
Immediately after grinding, the high-temperature grinding dust attached to the grinding surface 1a of the grinding wheel 1 is rapidly cooled, and due to its powerful jetting force, it is not welded to the recesses 14 after removal of the abrasive grains or the recesses 15 of pores on the grinding surface 1a. The accumulated grinding dust is forcibly removed and removed. Similarly, the grinding fluid jetted from the second jet nozzle 9 separates and removes the grinding dust and the like adhering to the outer peripheral surface 2a of the adjusting wheel 2 by its jetting force.

In this case, in particular, the grinding fluid from the first injection nozzle 5 is used as the arc surface 4c of the grinding wheel side abdomen 4a of the work rest and the grinding surface 1.
Since it is sprayed in a narrow spray space between a and a, it is efficiently sprayed to the grinding surface 1a of the grinding wheel 1 without being scattered to the surroundings, and the cooling effect of grinding dust and the removal removal effect by the spray force are more efficient. It will be well demonstrated.

In addition, as a result of the sprayed grinding fluid being filled in the narrow spray space, a part of the grinding fluid is rotated with the grinding surface 1a of the grinding wheel 1 and supplied to the workpiece W being ground. And, the auxiliary cooling effect is also demonstrated. This cooling effect is considerably effective when the workpiece W is a small-diameter lightweight product having a diameter of 1 mm or less.

That is, in the conventional structure in which the grinding fluid is supplied only from the upper nozzle 8, the grinding fluid is supplied from the upper nozzle 8 in order to prevent an unstable grinding state due to the light weight of the workpiece W. The amount should be suppressed as much as possible, but on the other hand,
If the amount supplied is too small, the original cooling effect will be lost. On the other hand, when the grinding fluid supply device 10 is provided, a part of the grinding fluid ejected from the ejection nozzle 5 is also supplied to the workpiece W as described above, so that the grinding fluid from the upper nozzle 8 is not supplied. Even if the supply amount is suppressed, it is possible to secure a sufficient cooling effect on the workpiece W.

[Effect of device]

As described above in detail, according to the present invention, the injection nozzle for injecting the grinding fluid onto the grinding surface of the grinding wheel ejects the grinding fluid at an acute angle with respect to the rotating direction of the grinding wheel. The high-temperature grinding chips attached to the grinding surface of the machine are quickly cooled, and the grinding chips deposited or deposited on the grinding surface after the abrasive grains have fallen off or in the pores of the pores are forcibly forced by the jetting force of the grinding fluid. Removed and removed.

In particular, since the injection of the grinding fluid is in the form of a reverse injection with respect to the rotation direction of the grinding wheel, the ejection force of the grinding fluid on the grinding surface in this case is the same as the ejection force given to the grinding fluid itself. The rotation speed is also increased, and the removal and removal effect of the grinding dust is remarkable together with the preceding rapid cooling effect of the grinding dust.

As a result, the clogging phenomenon of the grindstone that hinders the grinding efficiency in the grinding work is effectively prevented, and the practically remarkable effect such as maintaining the high-precision grinding work, reducing the number of dressing of the grinding wheel and improving the grindstone life. Is demonstrated.

[Brief description of drawings]

FIG. 1 is a sectional view showing a grinding fluid supply device in a centerless grinding machine according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a grinding surface of a general grinding wheel. . 1 ... Grinding wheel 1a ... Grinding wheel outer peripheral surface (grinding surface), 2
…… Adjustment wheel 2a …… Adjustment vehicle outer peripheral surface 3 …… Workpiece support plate 4 …… Work rest 4a …… Work rest grinding wheel side abdomen 4b …… Work rest adjustment car side abdomen Four
c ... Circular surface of abdomen of grinding wheel side, 5 ... Injection nozzle for grinding wheel, 6 ... Communication hole, 9 ... Injection nozzle for adjusting wheel, 8
… Upper nozzle, 10 …… Grinding fluid supply device, W …… Workpiece

Claims (4)

[Scope of utility model registration request] 1. A centerless grinding machine for performing circular grinding while grinding a workpiece supported by an adjusting wheel and a workpiece support plate with a grinding wheel, wherein a work rest for holding the workpiece support plate is provided with: An injection nozzle for injecting a grinding liquid is provided on the grinding surface of the grinding wheel, and this injection nozzle is opened to the grinding wheel side abdomen of the work rest, and the direction of the grinding liquid injection is in the rotation direction of the grinding wheel. A grinding fluid supply device for a centerless grinding machine, which is set to have an acute angle. 2. The utility model registration claim wherein the surface of the grinding wheel side abdomen of the work rest in which the injection nozzle is opened is formed as an arc surface along the grinding surface of the grinding wheel.
A grinding fluid supply device for a centerless grinding machine according to item (1). 3. A utility model registration claim (1), wherein a communication hole for supplying a grinding liquid is provided in the lower central portion of the workrest, and the base end of the injection nozzle is communicated with the communication hole.
A grinding fluid supply device for a centerless grinding machine as described in the above item. 4. A centerless grinding according to claim 1, wherein an injection nozzle for injecting a grinding fluid onto the outer peripheral surface of the adjusting wheel is opened in the abdomen of the workrest on the adjusting wheel side. Disk grinding fluid supply device.