JP2000153459A - Polishing machining device for grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain deterioration of polishing efficiency or early abrasion of grit caused by mixture of chip. SOLUTION: In this polishing machining device 10, a grinding wheel 14 is pressed by a pressing plate 18 onto a polishing base 12 where grit (iron sand or the like) 16 is placed, while the polishing base 12 and the pressing plate 18 are respectively rotated about rotation centers S1, S2 to polish a surface of the grinding wheel 14, and grit 16 dropped from the polishing base 12 onto a receiving gutter 22 is recovered to be reused. In this case, one pulley 34 separates the grit 16 from chip of the grinding wheel 14 by a horizontal conveyor 32 composed of a permanent magnet, and the grit 16 only is circularted to be reused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone polishing apparatus, and more particularly to a technique for reusing grit for polishing a grindstone.

[0002]

2. Description of the Related Art While a flat work surface of a grindstone is pressed onto a polishing table on which a large number of minute grit are placed, the polishing table and the grindstone are relatively moved in a direction parallel to the work surface. 2. Description of the Related Art A grindstone polishing apparatus that grinds a surface to be processed with the grit is used, for example, in the case of manufacturing a vitrified grindstone when finishing a fired grindstone to a predetermined size. Such a polishing apparatus generally uses a grit of about # 36, and the grit dropped from the polishing table is collected and supplied to the polishing table again, while the fine particles worn by the polishing (for example, # 36)
The grit of about 60 or less) is removed by a dust collector together with the swarf of the grindstone generated during the polishing process. Here, “以下 ·· or less” means that the grain size is smaller (finer) than ♯ ··, and the number after ♯ is larger than “··”.

[0003]

However, since the collected grit contains relatively large chips (for example, about $ 60 or more) that cannot be suctioned and removed by a dust collector, the polishing efficiency is reduced or the grit is reduced. However, there is a problem that the steel is worn out early.

[0004] Further, when the grit is worn out and the particle size is reduced, the processing efficiency is reduced even if the particle size is $ 60 or more. Further, the grinding process of a grindstone having a grain size of about # 46 to # 80 can be performed satisfactorily, but if it is finer than # 80, a sufficiently satisfactory finished surface roughness cannot be obtained,
Grinding with such a grit cannot be applied to a grindstone of about $ 150 or less, and finishing is performed with a diamond tool.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to suppress a decrease in polishing efficiency and early wear of grit due to mixing of cutting chips, and to reduce grit wear. It is an object of the present invention to suppress a decrease in polishing efficiency due to grain refinement and to enable good polishing to be performed on grindstones having various particle sizes.

[0006]

In order to achieve the above object, a first invention is to provide a polishing apparatus which presses a flat work surface of a grindstone on a polishing table on which a large number of minute grit are placed, and performs polishing on the grindstone. A polishing apparatus for a grindstone that relatively moves a table and its grindstone in a direction parallel to the surface to be machined and polishes the surface to be machined with the grit, and (a) occurs with the grinding process. Collecting means for collecting the chips of the grinding stone together with the grit; (b) separating means for separating the chips and the grit; and (c) supplying the grit separated by the separating means onto the polishing table. Grit supply means.

According to a second aspect of the present invention, there is provided the grinding wheel polishing apparatus according to the first aspect of the present invention, wherein (a) the grit is made of a magnetic material that is attracted to a magnet, and (b) the separating means is provided with a magnetic force. And the grit is adsorbed and separated from the chips.

According to a third aspect of the present invention, in the grinding wheel polishing apparatus of the second aspect, the grit separated by the action of the magnetic force by the separating means is demagnetized before entering the gap between the polishing table and the grinding stone. It is characterized by having a demagnetizing means.

According to a fourth aspect of the present invention, there is provided the grinding wheel polishing apparatus according to any one of the first to third aspects, wherein: (a) sorting means for sorting only a predetermined size of the grit separated by the separating means. (B) wherein the grit supply means supplies only the selected grit to the polishing table.

According to a fifth aspect of the present invention, there is provided the grinding wheel polishing apparatus according to any one of the first to third aspects, wherein (a) a classification storage means for classifying and storing the grit separated by the separation means according to particle size; b) selecting means for selecting any one of the classified plural kinds of grit to be supplied onto the polishing table by the grit supply means.

According to a sixth aspect of the present invention, there is provided the grinding wheel polishing apparatus according to the fifth aspect, wherein: (a) input means for inputting information relating to at least one of the grain size of the abrasive grains of the whetstone, a required processing surface roughness, and a processing speed. And (b) use grid determining means for determining the type of grid to be used based on the information input by the input means, and (c) the selecting means is determined by the use granularity determining means. The kind of grit is automatically selected.

[0012]

In such a grindstone polishing apparatus, the chips and the grit collected by the collecting means are separated by the separating means, and only the grit is supplied to the polishing table by the grit supplying means and reused. Therefore, a decrease in the polishing efficiency and an early wear of the grit due to the mixing of the chips are suppressed.

In the second invention, a grit made of a magnetic material that is attracted to a magnet is used, and the grit and the chips are separated by the action of a magnetic force. Even if the size is large, it can be separated well. Also,
Although the grit separated by the action of the magnetic force is magnetized in this way, in the third invention, the grit is demagnetized by the demagnetizing means before the grit enters between the polishing table and the grindstone. It is possible to prevent the polishing performance from being impaired due to the adsorption and the grit from being attached to a member made of a magnetic material such as iron.

[0014] In the fourth aspect of the present invention, only the grit separated by the separation means is separated by a predetermined size by the selection means and supplied to the polishing table by the grit supply means. It is possible to remove a relatively small grit worn by the method, and it is possible to suppress a decrease in the polishing efficiency due to a finer grain due to the worn grit.

In the fifth invention, the grit separated by the separation means is classified and stored by the classification storage means according to particle size, and an arbitrary grit selected by the selection means among the plurality of classified grit is selected. Since the grit is supplied onto the polishing table by the grit supply means, a decrease in the polishing efficiency due to fine grinding due to abrasion of the grit is suppressed by selecting an appropriate type (grit) of grit. . Also, by selecting an appropriate type of grit according to the grain size of the abrasive grains of the grindstone to be polished, the required processing surface roughness, the processing speed, etc., it is possible to perform a desired finish polishing, etc. Good polishing can be performed on a grindstone having a grain size. For example, polishing can be performed with grit on a grindstone having a grain size of about $ 150 or less.

In the first to fourth inventions as well, by using a grit having an appropriate particle size, good polishing can be performed even on a grindstone having a particle size of about $ 150 or less. High versatility as in the fifth invention cannot be obtained with only the kind of grit.

In the sixth invention, when information relating to at least one of the grain size of the abrasive grains of the grindstone, the required processing surface roughness, and the processing speed is input by the input means, the type of grit to be used is determined based on the information. It is determined, and the grit of the determined type is automatically selected by the selecting means, so that the grit is automatically automatically selected according to the grain size of the abrasive grains, the required surface roughness, and the processing speed. Polishing is performed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION
In the production of a vitrified grindstone, it is preferably used when finishing the burned grindstone to a predetermined size, but can also be used for polishing other grindstones. The grit may be supplied not only from the collected grit but also from a new grit. The supply of new grit may be performed by using a grit supply means for supplying the collected grit, but a separate supply means for new grit may be provided. The relative movement between the polishing table and the whetstone is
Revolving motion, linear reciprocating motion, a combination of these motions, etc.
Various movement modes can be adopted.

As the grit, a material made of a magnetic material such as iron which is attracted to a magnet as in the second invention is preferably used. As the separating means, various means can be employed depending on the material of the grit, such as a means for separating using a difference in specific gravity, in addition to using magnetic force. The size of the grit is appropriately set according to the grain size of the abrasive grains of the grindstone to be polished. For example, when the grain size of the abrasive grains is about 46 to 80, a new grit of about 36 It is preferably used.

The demagnetizing means of the third invention only needs to demagnetize at least before the grit enters between the polishing table and the grindstone. For example, it is demagnetized in a process in which the grit is conveyed by the grit supply means. It is arranged as follows.

The sorting means of the fourth invention and the classification and storage means of the fifth invention are constituted by using, for example, a sieve having a predetermined size. The selection unit may be, for example, a unit that selects grit having a size equal to or larger than a predetermined value.

According to a fifth aspect of the present invention, the selection means includes an opening / closing shutter for opening / closing each container storing a plurality of types of grit and discharging an arbitrary grit, and transporting the grit from each container using a conveyor or a suction device. Various means such as a carry-out device can be adopted. Further, an arbitrary grit may be automatically selected by a driving unit such as a shutter opening / closing unit, but an arbitrary grit can be selected manually by opening / closing the opening / closing shutter manually. May be. In the sixth invention, the grid to be used is automatically selected according to the determination by the grid to be used determining means. However, the grid to be used can be arbitrarily selected by an operator's key input or selection operation, or a switch ON / OFF operation. It may be. Usually, only one kind of grit is used, but a plurality of kinds of grit may be selected at the same time.

The input means according to the sixth aspect of the present invention may be input by an operator through key operation or selection operation, or may be input on a recording medium attached to the grindstone or online. The information to be input may be any one of the grain size of the abrasive grains of the grindstone, the required processing surface roughness, and the processing speed,
All three may be input. The processing speed is
The relative movement speed and pressing force between the polishing table and the grindstone are used. The used grit determination means stores, for example, a data map for determining the particle size of the grit using the particle size of the grindstone, the required processing surface roughness, and the processing speed as parameters.
For example, when performing high-speed processing (high processing speed) during rough finishing, use a new or coarse-grit grit, and perform precision processing (low processing speed) on fine-grain stones during finishing processing. Is defined to use fine grit.

Various types of grit to be used (grain size) and processing conditions (relative moving speed, pressing force, etc.) are automatically determined in accordance with the grain size of the grinding stone and the required surface roughness. It can be implemented in an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a schematic configuration diagram of a grindstone polishing apparatus 10 according to one embodiment of the present invention, and FIG. 1B is a plan view showing the vicinity of a polishing table 12 and a grindstone 14. Polishing table 12
Is not a generally disc-shaped, with its flat top surface is disposed in a posture to be substantially horizontal, and is rotated in a substantially vertical (perpendicular) center line S around _1.
A large number of fine grit 16 is placed on the polishing table 12, and a grindstone 14 to be polished is disposed thereon, and is pressed against the polishing table 12 by a holding plate 18 with a predetermined pressing force. pressing plate 1 about the center line S ₂ of the presser plate 18
The flat processing surface (lower surface) of the grindstone 14 is polished by the grit 16 by being rotationally driven together with 8. In this embodiment, as shown by arrows in FIG. 1B, both the polishing table 12 and the grindstone 14 can be rotated clockwise around the center lines S ₁ and S ₂ , respectively. The holding plate 18 is disposed at a predetermined position so as to be unrotatable around the center line S ₁ by a support post 20 extending upward through the center of the polishing table 12, and is rotated around a center line S ₂ by a motor (not shown). Is driven to rotate.

The grinding stone 14 is a vitrified grinding stone in which abrasive grains are bonded by vitrified bonds (eg, feldspar, potter's stone, refractory clay, etc.).
It is about 0. The grit 16 is made of iron (iron sand or the like) adsorbed by a magnet, and has a new particle size of about $ 36. In the figure, the grit 16 is exaggerated for clear illustration.

A receiving gutter 22 is provided around the polishing table 12 at a fixed position to receive the grit 16 dropped from the polishing table 12 to the periphery and the cutting powder (polishing powder) of the grindstone 14 generated by the polishing process. The grit 16 and the chips that have fallen into the receiving trough 22 are
2 by the scraper 24 provided on the side surface of the polishing table 1
With the rotation of _No. 2, it is moved clockwise around the center line S1, and falls through the pit 26. The dropped grit 16 and the swarf are once stored in a container 28, then carried out upward by a vertical conveyor 30 having a bucket, thrown into a hopper 31 and supplied onto a horizontal conveyor 32.
One pulley 34 of the horizontal conveyor 32 is constituted by a permanent magnet, and the iron grit 16 rotates halfway around the pulley 34 and falls into the container 36, but chips that are not attracted to the magnet are moved around the pulley 34. After falling by 1/4 turn, it falls on the chute 38 and is stored in the container 40. The components of the chips are alumina and silicon carbide constituting the abrasive grains of the grindstone 14, feldspar and pottery stone constituting the vitrified bond, and are not adsorbed to the pulley 34 made of the permanent magnet. The receiving gutter 22 and the scraper 24 constitute a collecting means, and the horizontal conveyor 32 having a permanent magnet pulley 34 constitutes a separating means.

The grit 16 in the container 36 is carried out upward by a vertical conveyor 42 having a bucket, and the hopper 4
3 and slides down on the chute 44 and is supplied onto the polishing table 12 again. A demagnetizer 46 is provided in the middle of the vertical conveyor 42 as a demagnetizing means, and demagnetizes the grit 16 magnetized by the pulley 34 made of the permanent magnet. The supply position of the grit 16 onto the polishing table 12 is set at a position slightly upstream of the grindstone 14 in the rotation direction of the polishing table 12 as shown by a white arrow in FIG. The grit supply means includes the vertical conveyor 42 and the chute 44.

The hopper 43 is supplied with new grit 16 as needed. A dust collector is provided in the vicinity of the polishing table 12, for example, so as to suck and remove the grit 16 and the swarf of about $ 60 or less.

In the polishing apparatus 10 of this embodiment, the grit 16 and the chips are separated by the horizontal conveyor 32, and only the grit 16 is supplied to the polishing table 12 and reused. A decrease in the polishing efficiency and early wear of the grit 16 due to the mixing of the powder are suppressed. Further, in this embodiment, since the iron grit 16 and the chips are separated by the action of the magnetic force by the permanent magnet pulley 34, even if the grit 16 and the chips are approximately the same size, the grit 16 and the chips are separated well. Is done. Moreover, the grit 16 separated by the action of the magnetic force is demagnetized by the demagnetizer 46 in the process of being transported upward by the vertical conveyor 42, so that the grit 16 is attracted to each other during polishing and the polishing performance is impaired. The grit 16 is prevented from adhering to the iron polishing table 12 and the like.

Here, the effects of the present invention will be specifically clarified.
In order to do so, test results performed by the present inventors will be described.
The particle size of the grit 16 used is $ 36 as new,
The grindstone 14 to be polished is “A60M610 × 54 × 30
4.8 ”, that is, vitrification with a grain size of $ 60
The pressing force by the holding plate 18 is 40 kgf / cm.
^TwoIt is. And as the grit 16 wears out,
When the chips of the stone 14 are mixed in the grit 16 (horizontal
Circulate grit containing chips without separation by conveyor 32
And a horizontal conveyor 32.
In the case of separating and circulating the chip 16 from the chips,
With new 36 grit 16
The processing efficiency was examined, and the results shown in Table 1 were obtained.
The fruit was obtained. As is clear from Table 1, the present invention
According to the separation grit, compared to the conventional mixed grit
Processing efficiency is improved by about 30%, and new grit is used.
The same processing efficiency as in the case of Mixed grit,
In the test using the separated grit, a new grit is
When polishing is performed by circulating while supplying continuously
In addition, the grit particle size distribution became almost constant and almost equilibrium
The grit average particle size at that time and
The ratio is as shown in Table 2.

[0032]

[Table 1]

[Table 2]

Next, another embodiment of the present invention will be described. In the following embodiments, portions substantially common to the above embodiments are given the same reference numerals, and detailed description thereof will be omitted.

The chute 50 shown in FIG. 2 is used in place of the chute 44. The chute 50 is provided with a sieve 52 at an intermediate portion and is provided with a predetermined vibration by a vibration generator 54. The grit 16 having a predetermined particle size or less such as $ 50 or less is dropped from the sieve 52 to be removed, so that only the grit 16 having a predetermined particle size or more is supplied onto the polishing table 12. The particle size of the grit 16 to be supplied,
That is, the size of the mesh of the sieve 52 is determined by the whetstone 1 to be polished.
The grit 16 dropped from the sieve 52 may be appropriately set according to the grain size of the abrasive grains, the required processing surface roughness, the processing speed, and the like, and may be configured to be supplied to the polishing table 12. The sieve 52 and the vibration generator 54 correspond to a sorting unit.

In this case, the separating means (horizontal conveyor 3)
Since only the grit 16 having a predetermined particle size or more is selected from the grit 16 separated from the swarf and supplied to the polishing table 12, the relatively small grit 16 worn by the polishing process is removed.
Is removed, and a decrease in the polishing efficiency due to the grain refinement due to the abrasion of the grit 16 is suppressed.

The classification storage means 60 shown in FIG. 3 includes the grit 1 separated from the chips by the separation means (horizontal conveyor 32).
6 is divided into three types according to the particle size and stored, and sieves 62 and 64 having different eye sizes are provided, and two types of chutes 70 and 72 vibrated by vibration generators 66 and 68 are provided. The grit 16 carried out of the container 36 by the vertical conveyor 42 is
4, and are sequentially slid down on the chutes 70 and 72, and classified into three types according to the particle size in the process. The mesh of the sieve 62 is smaller than the sieve 64. For example, the grit 16 of about $ 54 or less is dropped and stored in the storage container 76a, and the sieve 64 is dropped of the grit 16 of about $ 46 or less and stored in the storage vessel 76b. And shoots 70 and 7
2 and the remaining grit 16 that has passed together
The grit 16 of about $ 46 is stored in the storage container 76c.

Each of the storage containers 76a, 76b and 76c is provided with shutters 80a, 80b and 80c which are opened and closed by opening and closing means 78a, 78b and 78c such as air cylinders as selection means. Are opened, the storage containers 76a, 76
Any of the grit 16 in b and 76 c is put into, for example, the hopper 43, and is supplied from the chute 44 onto the polishing table 12. The opening / closing means 78a, 78b, 78c are each operated in accordance with a command signal from the controller 82. The controller 82 operates the input means 84 such as a keyboard to input the grain size of the abrasive grains of the grindstone 14, the required surface roughness. When the information such as the processing speed is input, the grit 16 to be used is determined based on a data map or the like stored in advance, and the corresponding opening / closing means 78a,
The shutters 80a, 80c are provided by 78b or 78c.
b or 80c is opened to supply grit 16 of a predetermined particle size. The controller 82 corresponds to a use grid determining means, and in the present embodiment, includes a computer that performs signal processing according to a program stored in advance.

In this case, the separating means (horizontal conveyor 3)
The grit 16 separated from the chips by 2) is classified and stored by the classification storage means 60 according to particle size, and
Since any grit 16 is supplied onto the polishing table 12 by opening the shutters 80a, 80b, or 80c, by selecting a grit 16 of an appropriate type (granularity), the grit 16 is finely ground by abrasion. The reduction of the polishing efficiency caused by the above is suppressed. Further, when the grain size of the abrasive grains of the grindstone 14 to be polished, the required processing surface roughness, the processing speed, and the like are input by the input means 84, the type of the grit 16 to be used is determined based on the information, and Opening / closing means 78a, 78b,
Alternatively, since 78c is operated, appropriate polishing is automatically performed in accordance with the grain size of the abrasive grains, required processing surface roughness, processing speed, and the like.

The embodiments of the present invention have been described in detail with reference to the drawings. However, these are merely one embodiment, and the present invention is based on the knowledge of those skilled in the art. Can be implemented.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams illustrating a grindstone polishing apparatus according to an embodiment of the present invention, in which FIG. 1A is a schematic configuration diagram, and FIG. 1B is a plan view showing the vicinity of a polishing table and a grindstone.

FIG. 2 is a schematic configuration diagram illustrating an example of a sorting unit that sorts grit of a predetermined size.

FIG. 3 is a schematic configuration diagram illustrating an example of a classification storage unit, a selection unit, a used grid determination unit, and an input unit.

[Explanation of symbols]

 10: Grinding Stone Polishing Device 12: Polishing Table 14: Grinding Stone 16: Grit 22: Receiving Trough (Recovery Means) 24: Scraper (Recovery Means) 32: Horizontal Conveyor (Separation Means) 42: Vertical Conveyor (Grit Supply Means) 44 : Chute (grit supply means) 46: Demagnetizer (demagnetization means) 52: Sieve (selection means) 54: Vibration generator (selection means) 60: Classification storage means 78a, 78b, 78c: Opening / closing means (selection means) 80a : 80b, 80c: shutter (selection means) 82: controller (use grid determination means) 84: input means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akihide Ito 3-36 Noritakeshinmachi, Nishi-ku, Nagoya-shi, Aichi F-term in Noritake Co., Ltd. (reference) 3C047 AA18 BB01 EE02 GG14 GG17

Claims (6)

[Claims] 1. A grindstone and a whetstone are relatively moved in a direction parallel to the work surface while pressing a flat work surface of a whetstone on a polishing table on which a large number of minute grit are placed. A grindstone polishing apparatus for polishing the surface to be processed with the grit, and collecting means for collecting chips of the whetstone generated along with the polishing together with the grit; An apparatus for polishing a grindstone, comprising: separating means for separating grit; and grit supply means for supplying grit separated by the separating means onto the polishing table. 2. The method according to claim 1, wherein the grit is made of a magnetic material that is attracted to a magnet, and the separating unit is configured to attract the grit by the action of a magnetic force to separate the grit from the chips. The grinding device for grinding wheels according to claim 1. 3. A demagnetizing means for demagnetizing the grit before the grit separated by the action of magnetic force by the separating means enters between the polishing table and the grindstone. A grinding device for grinding wheels according to item 1. 4. A grit supply unit for selecting only grit separated from the grit separated by the separation unit, wherein the grit supply unit supplies the grit only to the polishing table. The grindstone polishing apparatus according to any one of claims 1 to 3, wherein 5. A classification storage means for classifying and storing grit separated by the separation means according to particle size, and an arbitrary grit of the classified grit is supplied onto the polishing table by the grit supply means. The grinding device for grinding wheels according to any one of claims 1 to 3, further comprising a selection unit that can select the grinding wheel. 6. An input means for inputting information relating to at least one of a grain size, a required processed surface roughness, and a processing speed of the abrasive grains of the whetstone, and a grit used based on the information input by the input means. 6. A use grid determining means for determining a type, wherein the selecting means is configured to automatically select a grid of the type determined by the use granularity determining means. A grinding device for grinding wheels according to item 1.