JP2007000965A - Grinding wheel and grinding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To significantly reduce solid matters in a grinding fluid used for machining compared with the conventional grinding wheel used for grinding glass and metals or the like and a grinding device provided with the grinding wheel. <P>SOLUTION: A grinding fluid channel for allowing the grinding fluid to flow out is formed to a base 13 having a part where abrasive grains are fixed. A filtration means 15 for removing the solid matters mixed into the grinding fluid is provided to the grinding fluid channel in the base 13. The filtration means 15 is arranged attachably/detachably to/from the base 13. The filtration means 15 is composed such that a plurality of filters 21, 23 are arranged in the grinding fluid channel at an interval and an opening size of the downstream side filter 21 is set smaller than that of the upstream side filter 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a grinding wheel used for grinding of glass, metal and the like, and a grinding apparatus provided with the grinding wheel.

Conventionally, in grinding processing of glass, metal or the like, processing is performed while supplying a grinding liquid between a grinding wheel and a workpiece. By supplying the grinding fluid in this manner, frictional heat generated by processing can be removed. In addition, it is possible to quickly discharge solids such as shavings of the workpiece and dropped abrasive grains.
On the other hand, it is economically and environmentally effective to use the grinding fluid in a circulating manner. Therefore, conventionally, the grinding fluid used for processing is guided to a centrifugal separator or the like, and solids such as shavings and abrasive grains mixed in the grinding fluid are removed and then circulated by a pump.
JP 2001-277113 A Utility Model Registration No. 3093941

However, it is difficult to completely remove the solid matter different from the abrasive particles mixed in the grinding fluid even if a centrifuge is used. Depending on the work piece, the solid matter is deep when it collides with the surface. Even if it becomes a defective product due to scratches or does not lead to a defective product, there is a problem that processing in a subsequent process takes a long time to remove the defect.
The present invention has been made in order to solve such a conventional problem, and provides a grinding wheel and a grinding apparatus capable of significantly reducing solids different from abrasive grains in a grinding liquid used for processing than before. The purpose is to provide.

The grinding wheel according to the first aspect of the present invention forms a grinding fluid passage for flowing out the grinding fluid in a base having a portion to which abrasive grains are fixed, and is mixed in the grinding fluid in the grinding fluid passage in the base. It is characterized by providing a filtering means for removing the solid matter.
The grinding wheel of the second invention is the grinding wheel of the first invention, wherein the filtering means is detachably disposed on the base.

  A grinding wheel of a third invention is the grinding wheel of the first invention or the second invention, wherein the filtering means has a plurality of filters arranged at intervals in the grinding fluid passage, and a downstream filter. The aperture size of the filter is smaller than the aperture size of the upstream filter. A grinding apparatus according to a fourth aspect of the invention includes the grinding wheel according to any one of the first to third aspects of the invention.

In the grinding wheel of the present invention, since the filtering means for removing the solid matter different from the abrasive grains mixed in the grinding liquid is provided in the grinding liquid passage of the base, the abrasive grains in the grinding liquid to be processed and Can significantly reduce the different solids than before.
In the grinding device of the present invention, since the grinding wheel of the present invention is used, it is possible to effectively suppress the occurrence of scratches and the like on the workpiece due to the solid material in the grinding fluid.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show an embodiment of the grinding wheel of the present invention.
The grinding wheel 11 has a base 13 serving as a base plate. The base 13 has a disk shape and is made of a metal such as aluminum. For example, the base 13 has an outer diameter of 270 mm and a thickness of 20 mm. A through hole 13a is formed at the center of the base 13, and a filtering means 15 is disposed in the through hole 13a. The diameter of the through hole 13a is, for example, 16 mm.

  A plurality of grindstone members 17 are fixed to the upper surface 13 b (grinding surface) of the base 13. The grindstone member 17 is disposed concentrically around the through hole 13a at a predetermined angle. The grindstone member 17 is a so-called pellet grindstone in which a large number of abrasive grains are held by a binder such as resin bond or Ni-P plating. The grindstone member 17 has a cylindrical shape with an outer diameter of 10 mm, for example, and is attached to the upper surface 13b of the base 13 with an adhesive or the like.

A shaft mounting portion 19 is disposed at the center of the lower surface 13 c of the base 13. A through hole 19a having a diameter of 13 mm, for example, is formed at the center of the shaft attachment portion 19. The shaft mounting portion 19 is fixed to the lower surface 13c of the base 13 by brazing or the like. Note that the shaft attachment portion 19 may be integrally formed with the base 13.
FIG. 3 shows details of the central portion of the base 13 on which the above-described filtering means 15 is arranged.

The filtering means 15 includes a first filter member 21 and a second filter member 23 that are accommodated in the through hole 13 a of the base 13. A second filter member 23 is disposed below the first filter member 21.
The first filter member 21 includes a filter 25 and a holding member 27 that holds the filter 25. The holding member 27 is made of stainless steel and has an annular shape. For example, the holding member 27 has a thickness of 6 mm and an outer diameter of 15 mm. The diameter of the hole 27a is, for example, 10 mm.

  A recess 27b is formed on the lower surface of the holding member 27, and the filter 25 is disposed in the recess 27b. The filter 25 has a circular shape and is joined to the holding member 27 by welding (not shown) or the like. The filter 25 is formed by forming a stainless steel wire in a net shape and has an opening size of, for example, 32 μm. As the filter 25, it is desirable to use a filter used in a test sieve defined in JIS-Z8801. By using such a filter, the accuracy of the opening size of the filter 25 can be easily and reliably ensured.

The second filter member 23 includes a filter 29 and a holding member 31 that holds the filter 29. The second filter member 23 is the same as the first filter member 21 except that the opening size of the filter 29 is 100 μm. Therefore, detailed description is omitted.
Between the holding member 27 of the first filter member 21 and the holding member 31 of the second filter member 23, a seal member 33 made of an O-ring such as rubber is disposed. Further, a seal member 35 made of an O-ring such as rubber is disposed between the holding member 31 of the second filter member 23 and the shaft mounting portion 19.

  A fixing member 37 is disposed above the through hole 13 a of the base 13. The fixing member 37 is made of stainless steel, for example, and is formed in an annular shape. A male screw portion 37 a is formed on the outer periphery of the fixing member 37. The male screw portion 37 a is screwed into a female screw portion 13 d formed on the inner periphery of the through hole 13 a of the base 13. A pair of locking grooves 37 c are formed on the outer side of the hole 37 b on the upper surface of the fixing member 37 so as to face each other. By locking a coin or the like in the locking groove 37c, the fixing member 37 can be easily rotated.

The grinding wheel 11 described above is manufactured as described below.
First, after the base 13 is washed and dried, an adhesive (not shown) is applied to the upper surface (surface side) 13b of the base 13, and the grindstone member 17 is attached. After the adhesive is cured, the seal member 35, the second filter member 23, the seal member 33, and the first filter member 21 are sequentially accommodated in the through hole 13a of the base 13 from the side opposite to the shaft attachment portion 19. . Next, the male screw portion 37a of the fixing member 37 is screwed into the female screw portion 13d of the through hole 13a, and the fixing member 37 is tightened until it does not rotate with a predetermined force. Accordingly, the first filter member 21 and the second filter member 23 are held in the through hole 13a via the seal members 33 and 35.

FIG. 4 schematically shows a main part of a grinding apparatus using the above-described grinding wheel 11.
In this grinding apparatus, the shaft mounting portion 19 disposed at the lower portion of the base 13 of the grinding wheel 11 is fixed to the grinding wheel shaft 43 via the mounting member 41. The mounting member 41 and the grindstone shaft 43 are formed with grinding fluid passages 41a and 43a for circulating the grinding fluid.
On the other hand, a work shaft 45 is disposed above the grinding wheel 11. A workpiece 47 made of glass, for example, is fixed to the lower end of the work shaft 45 via an attachment member 49. The work shaft 45 is elliptically moved or reciprocated left and right with the rotation of the grindstone shaft 43 through a drive mechanism (not shown).

  A table 51 that receives the grinding fluid that has flowed out of the grinding wheel 11 is disposed below the grinding wheel 11. A discharge port 53 is formed in the table 51. The discharge port 53 is connected to the grinding fluid passage 43 a of the grindstone shaft 43 through the circulation pipe 55. In the circulation line 55, a tank 57, a pump 59, a centrifuge 61, and a pump 63 are arranged in this order from the upstream side.

  In the above-described grinding apparatus, the grindstone shaft 43 is rotated to move the work shaft 45 downward while moving the work shaft 45 elliptically or reciprocating left and right, and the workpiece 47 is moved to the upper surface of the grindstone member 17 of the grinding wheel 11. The workpiece 47 is ground by coming into contact with. At the time of grinding, a grinding fluid is supplied between the workpiece 47 and the grindstone member 17 through the filtering means 15 disposed on the base 13.

  The grinding fluid supplied between the workpiece 47 and the grindstone member 17 passes through the discharge port 53 of the table 51 and is collected in the tank 57. Most of the large solids settle in the tank 57 and the stagnation is sucked out by the pump 59. The grinding liquid in the tank 57 is guided to the centrifugal separator 61 by the pump 59, and the centrifugal separator 61 removes almost all solid matter such as shavings of the workpiece 47 and dropped abrasive grains. The grinding liquid from which the solid matter is almost removed is circulated by the pump 63 to the grinding liquid passage 43 a of the grindstone shaft 43. The grinding fluid circulated through the grinding fluid passage 43 a passes through the grinding fluid passage 41 a of the attachment member 41 and is guided to the filtering means 15 through the shaft attachment portion 19 of the grinding wheel 11.

  In the filtering means 15, first, solids having a particle size of, for example, 100 μm or more are removed by the filter 29 of the second filter member 23, and then, particles of, for example, 32 μm or more are removed by the filter 25 of the first filter member 21. Diameter solids are removed. Then, the grinding fluid from which the solid matter having a particle diameter of 32 μm or more is substantially completely removed is supplied between the workpiece 47 and the grindstone member 17 from the center of the grinding stone 11.

  In the grinding wheel 11 described above, the filtering means 15 for removing solids other than the abrasive grains mixed in the grinding fluid is provided in the through hole 13a serving as the grinding fluid passage formed in the base 13, so that it is used for processing. It is possible to significantly reduce the solids in the grinding fluid that is used. Accordingly, it is possible to effectively reduce the solid object colliding with the surface of the workpiece 47 during grinding and scratching the workpiece 47.

  And since the filtration means 15 was provided in the grinding wheel 11, the solids other than an abrasive grain are removed effectively by setting the opening size of the filter 25 according to the particle size of the abrasive grain of the grinding wheel 11. be able to. For example, when the grinding wheel 11 is for finishing and the abrasive grains are fine, the smaller solids are removed from the grinding liquid by reducing the aperture size of the filter 25 according to the grain size. Is possible. Accordingly, it is possible to reduce the possibility of a large scratch on the surface of the workpiece 47 during the finishing process.

Further, since the filtering means 15 is provided in the grinding wheel 11, for example, compared with the case where a cartridge type filter is installed in the middle of the circulation pipe 55, the apparatus can be made very simple. The equipment cost can be reduced.
In the grinding wheel 11 described above, the filtering means 15 is detachably disposed on the base 13, so that even when the filters 25 and 29 are clogged, they can be easily removed and cleaned or replaced. . Further, by providing the common filtering means 15 to the base of other grinding wheels, it is possible to replace the first filter member 21 and the second filter member 23 of grinding wheels that are not used. Become. Thereby, it is not necessary to prepare the filter members 21 and 23 for the total number of the grinding wheels 11.

Further, in the grinding wheel 11 described above, the opening size of the filter 25 of the first filter member 21 located on the downstream side of the filtering means 15 is set to the opening size of the filter 29 of the second filter member 23 located on the upstream side. Since it is smaller than the size, the solid matter mixed in the grinding fluid can be effectively removed.
The openings of the filters 25 and 29 are preferably selected according to the situation because the original effect of the filters 25 and 29 cannot be obtained even if they are too coarse, and clogging is likely to occur if they are too fine. . For example, it is desirable to examine in advance the size of solids in the grinding fluid flowing into the filtering means 15 and to set the opening size so that solids of this size can be removed.
(Supplementary items of the embodiment)
As mentioned above, although this invention was demonstrated by embodiment mentioned above, the technical scope of this invention is not limited to embodiment mentioned above, For example, the following forms may be sufficient.

(1) In the above-described embodiment, the example in which the grindstone member 17 made of a so-called pellet type grindstone is attached to the base 13 has been described. For example, abrasive grains may be directly fixed to the base 13.
(2) In the above-described embodiment, the example in which the workpiece 47 is disposed above the grinding wheel 11 has been described. However, the workpiece 47 may be disposed below the grinding wheel 11.
(3) In the above-described embodiment, the example in which the two filter members 21 and 23 are arranged in the filtering unit 15 has been described. However, for example, one or three or more filter members may be arranged. .

  (4) In the above-described embodiment, the example in which the first filter member 21 and the second filter member 23 are held in the through hole 13a of the base 13 by the fixing member 37 has been described. For example, the first filter member A male screw portion may be formed on the outer periphery of the holding members 27 and 31 of the 21 and the second filter member 23, and this male screw portion may be directly screwed into a female screw portion formed in the through hole 13a.

It is a longitudinal section showing one embodiment of a grinding wheel of the present invention. It is a top view of the grinding wheel of FIG. It is a longitudinal cross-sectional view which shows the detail of the filtration means of the grinding wheel of FIG. It is explanatory drawing which shows the grinding device provided with the grinding wheel of FIG.

Explanation of symbols

  11: grinding wheel, 13: base, 15: filtering means, 17: grinding wheel member, 21: first filter member, 23: second filter member, 25, 29: filter.

Claims (4)

  Filtration means for forming a grinding fluid passage for flowing out the grinding fluid in a base having a portion to which abrasive grains are fixed, and removing solid matter mixed in the grinding fluid in the grinding fluid passage in the base. A grinding wheel characterized by being provided. In the grinding wheel according to claim 1,
The said grinding | polishing means is arrange | positioned at the said base so that attachment or detachment is possible, The grinding wheel characterized by the above-mentioned. In the grinding wheel according to claim 1 or 2,
The filtering means is characterized in that a plurality of filters are arranged at intervals in the grinding fluid passage, and the opening size of the downstream filter is made smaller than the opening size of the upstream filter. Grinding wheel.   A grinding apparatus comprising the grinding wheel according to any one of claims 1 to 3.

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