JP5146647B2 - Grinding wheel and method for adjusting weight balance of grinding wheel - Google Patents

Description

  The present invention relates to a grinding wheel having an inner peripheral part to be attached to a tool holder and an outer peripheral part for grinding, and a weight balance adjusting method for the grinding wheel.

Grinding is performed as follows in a processing apparatus that performs machining using a number of cutting / grinding tools such as A) machining center, B) grinding center, C) compound processing machine, and D) grinding wheel multi-axis grinding machine. .
1) The grinding wheel is held by a tool holder.
2) In the case of a machining apparatus (A, B, C) having an automatic tool changer (hereinafter referred to as ATC), the tool holder is set on the tool axis only during use, and the rest is stored in the tool magazine.
3) In the case of the grindstone multi-axis grinding machine (D), the turret (tool post) turns and processes only when in use, and turns and stands by otherwise.
4) The grinding wheel does not rotate except during processing regardless of the presence or absence of ATC.

FIG. 3 shows a state in which the grinding wheel is held in the tool holder. The grinding wheel 10 is manufactured in a disk shape, and is fixed to the tool holder 20 by a fixing bolt 21 through an attachment hole 11 provided at the center thereof. The tool holder 20 is attached to the machine tool via a connecting part 20a with the machine tool.
Further, as shown in FIG. 4 in an enlarged manner, the grinding wheel has pores 10c formed when the abrasive grains 10a are bonded to the binder 10b. When the workpiece 30 is ground, the pores 10c are effective in maintaining the grinding performance by preventing the abrasive grains 10a from dropping off together with the chips 30a to prevent crushing.

1) In A, B, and C, the tool holder is generally manufactured so as to hold a relatively small diameter tool for cutting. Grinding requires high processing accuracy in terms of surface roughness and roundness. To that end, it is necessary to balance the weight of the grindstone while it is mounted on the tool holder. However, it is difficult for the grinding wheel to obtain a uniform pore distribution when the pores are formed as a whole, and the weight distribution is uneven and the weight balance tends to be biased. Further, commercially available holders do not have a mechanism for adjusting the weight balance.

2) When grinding is performed using a grinding liquid with a conventional grinding stone having pores (a grinding stone that can be applied to the entire grinding wheel that is not CBN or diamond), the grinding liquid penetrates unevenly into the pores. Therefore, in order to maintain the weight balance of the grindstone, it is necessary to stop the grinding liquid for a certain period of time after the processing is completed, idle the grindstone, and drain the water. However, in all cases A, B, C, and D, the grinding cycle cannot be rotated except when it is mounted on the tool spindle or when the turret is in the grinding position, so the machining cycle time is extended by the time of draining. The

A method of impregnating pores with a resin agent in order to prevent the penetration of a grinding fluid or the like into a grinding wheel having pores (see Patent Document 1), or a method of forming a waterproof film with a resin on a surface other than the grinding surface (See Patent Document 2).
JP 2002-205273 A JP 2006-198737 A

  However, the method shown in Patent Document 1 does not close the pores, and even if the amount of the grinding fluid is reduced, the penetration is still deep. Further, in the method shown in Patent Document 2, although the penetration of the grinding fluid into the pores other than the grinding action surface is avoided, it is not possible to avoid the penetration of the grinding fluid to the deep part through the grinding action surface, The problem caused by grinding fluid penetration cannot be improved sufficiently. Further, the methods disclosed in Patent Documents 1 and 2 have no effect of improving the weight balance deviation of the grinding wheel itself, and the grinding wheel mounted on the tool holder should be subjected to grinding in a state where the weight balance is not appropriate. There is a problem that it must be.

  The present invention has been made against the background of the above circumstances, and it is possible to obtain a high grinding accuracy and a weight balance of the grinding wheel by appropriately adjusting the weight balance of the grinding wheel when mounted on the tool holder. The purpose is to provide an adjustment method.

That is, among the grinding wheels of the present invention, the first present invention, except for the outer peripheral portion which is a grinding working surface, is arranged on the inner layer portion between the outer peripheral portion and the inner peripheral portion fixed to the tool holder. The thermosetting synthetic resin is impregnated and solidified so as to block the pores of the grinding wheel over the direction, and the impregnation and solidification of the inner layer portion is performed for each section obtained by dividing the inner layer portion into an arbitrary number in the circumferential direction. Further, the amount of impregnation of the thermosetting synthetic resin is adjusted .

In the grinding wheel of the second aspect of the present invention, in the first aspect of the present invention, the impregnation and solidification of the inner layer portion is further performed in the thermosetting synthetic resin for each section obtained by dividing the inner layer portion into any number in the thickness direction. The amount of impregnation is adjusted .

According to a third aspect of the present invention, there is provided a method for adjusting a weight balance of a grinding wheel by closing a pore portion of the grinding wheel in a circumferential portion between an outer peripheral portion which is a grinding working surface and an inner peripheral portion fixed to a tool holder. In the method of impregnating and solidifying the thermosetting synthetic resin , the circumferential portion is divided into an arbitrary number of sections in the circumferential direction, and the amount of impregnation of the thermosetting synthetic resin is adjusted for each of the sections. The weight balance is adjusted.

According to a fourth aspect of the present invention, there is provided a grinding wheel weight balance adjusting method according to the third aspect of the present invention, wherein the circumferential portion is further divided into a plurality of sections divided in an arbitrary number in the thickness direction. The weight balance of the grinding wheel is adjusted by adjusting the impregnation amount of the curable synthetic resin .

That is, according to the present invention, the thermosetting synthetic resin layer is formed on the inner layer portion between the outer peripheral portion which is the grinding working surface and the inner peripheral portion fixed to the tool holder, and the weight of the grinding wheel is reduced. By increasing the amount on the inner peripheral side, the weight balance biasing action of the grinding wheel itself can be made relatively small, and the weight balance can be improved. In particular, the circumferential direction or by impregnation amount for each partition divided into any number in the circumferential direction and the thickness direction is assumed to have been adjusted, the deviation of the weight balance with the grinding wheel itself thermosetting synthetic resin The weight balance can be adjusted to an appropriate one by offsetting the weight deviation. The weight balance may be static or dynamic, and both may be taken into account.
In addition, the thermosetting synthetic resin can further prevent the grinding fluid from penetrating into the inner layer by closing the pores, reducing the idling time for eliminating the grinding fluid and eliminating the idling process. To.

  The thermosetting synthetic resin is preferably a resin that cures at a low temperature (normal temperature or a little heating), and more preferably has a high bonding strength so that peeling and destruction do not occur during high-speed rotation. Moreover, the thing which does not corrode by a grinding fluid is desirable. For example, a binder for a resin bond grindstone is suitable for satisfying these conditions. In addition, it is particularly effective that the thermosetting synthetic resin can be mixed with a resin having a large specific gravity or a powder having a large specific gravity such as a metal to increase the correction range of the unbalance amount.

  The thermosetting synthetic resin layer is formed between the outer peripheral portion that performs the grinding action and the inner peripheral portion that is fixed to the tool holder, but the depth position is a portion that is not given to the grinding operation of the grinding wheel. . In addition, it is suitable that the part is as close as possible to the part given to the grinding operation. In addition, the thickness in the depth direction of the thermosetting synthetic resin layer is not particularly limited as the present invention, and it is effective for the thickness that effectively contributes to the adjustment of the weight balance and for preventing the penetration of the grinding fluid. It can be determined in consideration of the thickness that contributes.

As described above, according to the grinding wheel of the present invention, except for the outer peripheral portion which is a grinding working surface, the inner layer portion between the outer peripheral portion and the inner peripheral portion fixed to the tool holder is circumferentially arranged. The thermosetting synthetic resin is impregnated and solidified so as to block the pores of the grinding wheel, and the impregnation and solidification of the inner layer portion is performed in any direction in the circumferential direction or in the circumferential direction and the thickness direction. Since the impregnation amount of the thermosetting synthetic resin is adjusted for each section divided into a number, a grinding wheel with an appropriately adjusted weight balance can be obtained, and the grinding liquid is used in the depth direction during grinding. To prevent penetration of water and to reduce or eliminate draining operations.

  Furthermore, according to the method for adjusting the weight balance of the grinding wheel of the present invention, the pores of the grinding wheel are closed at the circumferential portion between the outer peripheral portion which is the grinding surface and the inner peripheral portion fixed to the tool holder. Since the thermosetting synthetic resin is impregnated and solidified to adjust the weight balance of the grinding wheel, it is possible to easily obtain the grinding wheel with the weight balance adjusted appropriately.

Hereinafter, one reference embodiment will be described.
FIG. 1 shows a grinding wheel 1 in which abrasive grains are bonded with a binder as shown in FIG. 4 and pores are dispersed throughout. The grinding wheel 1 has a disk shape, and an attachment hole 2 for attaching a tool holder is formed at the center.
The outer peripheral portion 3 is assigned to the grinding surface, and the inner peripheral surface side of the mounting hole 2 is an inner peripheral portion 4 fixed to the tool holder. The inner layer portion between the outer peripheral portion 3 and the inner peripheral portion 4 constitutes a thermosetting synthetic resin layer 5 having a predetermined thickness along the circumferential direction. The thermosetting synthetic resin layer 5 is obtained by impregnating the pores, which are components of the grinding wheel 1, with thermosetting resin and thermosetting the pores. In the thermosetting synthetic resin layer 5, the pores are blocked. It is peeling off. In the outer peripheral portion 3 and the inner peripheral portion 4 excluding the thermosetting synthetic resin layer 5, the pores are present without being blocked.
The thermosetting synthetic resin layer 5 has a specific gravity larger than that of the grinding wheel itself due to resin impregnation, and has a function of adjusting the weight balance of the entire grinding wheel 1. Even when there is a weight deviation due to the grinding wheel itself, the influence of the weight deviation is alleviated by the thermosetting synthetic resin layer 5 having a large specific gravity, and the overall weight balance is improved.

  When the grinding wheel 1 is mounted on a tool holder as shown in FIG. 3, high-precision processing can be performed by a good weight balance of the grinding wheel 1. In addition, the grinding fluid penetrates into the outer peripheral portion 3 which is the grinding working surface, but at a depth greater than that, the penetration is prevented by the thermosetting synthetic resin layer 5 and the grinding fluid penetration amount of the grinding wheel 1 as a whole is reduced. It can be greatly reduced. The grinding wheel 1 can be drained in a short time, and the draining operation itself can be eliminated if the influence is negligible because the amount of penetration is small.

  As shown in FIG. 1B, the thermosetting synthetic resin layer 5 has a thermosetting resin on the circumferential portion between the outer peripheral portion 3 and the inner peripheral portion 4 from the plane side of the grinding wheel 1. It can be obtained by injecting and curing by heating. Note that heating can be omitted for resins that can be cured at room temperature. The thermosetting synthetic resin can be injected by injection from one plane side while performing pressure injection from one plane side or pressure from the other plane side. In addition, it is possible to perform the injection by masking other than the circumferential portion.

In the reference embodiment, the thermosetting synthetic resin layer 5 is provided by impregnating the thermosetting resin with an even distribution amount between the outer peripheral portion 3 and the inner peripheral portion 4, but as the present invention, By changing the impregnation amount distribution in the circumferential direction or in the circumferential direction and the thickness direction, the weight balance of the grinding wheel can be adjusted more accurately.
In this embodiment, the circumferential portion is divided into a plurality of sections in the circumferential direction, and the resin impregnation amount is adjusted for each section. In this example, the sections are divided into four sections every 90 degrees as shown in FIG. . In each of the sections 5a ... 5d, the resin impregnation amount is set to adjust the weight balance of the grinding wheel 1. The compartments 5a, 5b, 5c, and 5d constitute a thermosetting synthetic resin layer. The said adjustment can be performed in the following processes.

1) Mount a grinding wheel on the tool holder.
2) Measure the weight balance of the holder. The measurement may be either static balance measurement or dynamic balance measurement.
3) Impregnation amount is determined for each section so as to offset the weight imbalance between the grinding wheel and the tool holder.
The grinding wheel is placed flat, and the amount of impregnated resin can be controlled by injecting resin into pockets 6 whose circumference is divided into an arbitrary number as shown in FIG. 2 (b). . When the impregnation amount is changed in the thickness direction, the impregnation amount can be varied by partitioning in the thickness direction by impregnating the thermosetting synthetic resin with different amounts from both sides of the grinding wheel. It is also possible to change the distribution of the resin amount by dividing each in the circumferential direction and the thickness direction.
4) Measure the weight balance again, confirm that the unbalance amount is within the specified value, and finish the work.
Thereafter, the grinding operation is started.
By the above, it becomes possible to adjust the weight balance of a grinding wheel more precisely and to use for grinding.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to the content of the said embodiment, Of course, unless it deviates from this invention, an appropriate change is possible.

It is a top view which shows the grinding wheel in the reference form with respect to this invention, and a side view which shows injection | pouring of a thermosetting resin. It is a top view which shows the grinding wheel in one Embodiment of this invention, and a top view which shows injection | pouring of a thermosetting resin. It is a side view which shows the grinding wheel with which the tool holder was mounted | worn. It is the side view which expanded a part which shows the grinding state by a grinding wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grinding wheel 2 Mounting hole 3 Outer peripheral part 4 Inner peripheral part 5 Thermosetting synthetic resin layer 5a Section 5b Section 5c Section 5d Section

Claims (4)

Except for the outer peripheral part that is the grinding surface, the inner layer part between the outer peripheral part and the inner peripheral part fixed to the tool holder is thermoset so as to block the pores of the grinding wheel in the circumferential direction. The synthetic resin is impregnated and solidified, and the impregnation and solidification of the inner layer portion is performed by adjusting the amount of the thermosetting synthetic resin impregnated for each section obtained by dividing the inner layer portion into an arbitrary number in the circumferential direction. A characteristic grinding wheel. The impregnation and solidification of the inner layer portion is characterized in that the amount of impregnation of the thermosetting synthetic resin is adjusted for each section obtained by dividing the inner layer portion into an arbitrary number in the thickness direction. Grinding wheel. A method of a thermosetting synthetic resin Ru impregnated and solidified in a circumferential portion so as to block the pores of the grinding wheel between the inner peripheral portion fixed to an outer peripheral portion and the tool holder is a grinding action surface, the circle A grinding wheel characterized in that a peripheral portion is divided into an arbitrary number in the circumferential direction and a weight balance of the grinding wheel is adjusted by adjusting an impregnation amount of the thermosetting synthetic resin for each of the divisions . Weight balance adjustment method. The circumferential portion is further divided into an arbitrary number of sections in the thickness direction, and the weight balance of the grinding wheel is adjusted by adjusting the amount of impregnation of the thermosetting synthetic resin for each section. The method for adjusting the weight balance of the grinding wheel according to claim 3.

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