JPH04226864A - Method and apparatus of manufacturing polishing body for polishing tool - Google Patents

Abstract

PURPOSE: To provide a method for manufacturing a grinding body for grinding tool which is preliminarily fixed in the structure and is provided with uniformity and excellent grinding performance and device thereof. CONSTITUTION: Each grinding body 45 is made of a plurality of layers made of a plurality of sintered metallic powder body layers or at least one of a sintered metallic thin piece 11" and natural and synthetic grinding grain 12". Each layer of these layers is alternately laminated within a mold for molding grinding body. Grinding grain, that is, a diamond chip 12" is sucked up by a vacuum action by a suction plate provided with holes distributed in accordance with a fixed geometrical pattern, is held/carried, is released on the metallic powder body layer or a thin piece and is arranged. Next, the laminated layer is compressed and molded, a grinding body blank is made, a sintered processing is performed for this blank under proper temperature/pressure and the uniform grinding body 45 is manufactured.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method and apparatus for manufacturing an abrasive body for an abrasive tool, and more particularly to an abrasive tool that is used while rotating, the abrasive body comprising metal powder, natural and synthetic abrasives. A method for producing a tool formed from a mixture with at least one material, and an abrasive body for an abrasive tool, which includes a support device for horizontally or vertically adjustable movement of a material intake and conveyance device. This invention relates to manufacturing equipment.

0002

[Prior Art] Conventionally known tools of this kind, particularly drill bits, circular saws, etc., in which the abrasive body is formed in a segment shape and are used for machining stone, marble, concrete, etc., are made of natural or An abrasive body is used in which abrasive particles such as synthesized industrial diamond are sintered and embedded in metal.

[0003] In manufacturing this type of abrasive, metal powder having a certain particle size and diamond chips or other abrasives are mixed in a suitable device (for example, a vibrating mixer).
The mixture is mixed at a fixed mixing ratio by a method, then put into an appropriate mold and cold-pressed to form a so-called preform (green compact), which is then polished by sintering at an appropriate temperature using a known method. manufacturing the body. The segment-shaped abrasive body thus completed is fixed to a support member by welding or the like to form an abrasive tool.

0004

[Problem to be Solved by the Invention] The problem with the abrasive body made by this method is that despite sufficient mixing of the materials,
So-called pockets occur in the distribution of diamond chips, where there are points where they are highly dense and areas where they are not. As a result, the sharpness of the tool deteriorates, and the finished surface of the workpiece also becomes unsatisfactory. Furthermore, the life of the abrasive is shortened due to diamond chips falling off, etc., and the abrasive body cannot meet today's technical precision requirements. The so-called pockets here arise, on the one hand, due to the residual magnetism of the diamond tip, and on the other hand, on the other hand, due to static electricity generated, in particular, during the mixing of the materials. Therefore, an object of the present invention is a method and apparatus for manufacturing an abrasive body for an abrasive tool, which allows the structure of the abrasive body to be determined in advance, has a homogeneous structure, and has superior polishing performance. The object is to eliminate the drawbacks of the prior art.

[0005]

[Means for Solving the Problems] In order to solve the above problems, according to the method for manufacturing an abrasive body of the present invention, in order to obtain an abrasive body having a highly homogeneous structure, a plurality of metal layers,
A plurality of abrasive layers in which a large number of abrasive particles are distributed in a certain geometric pattern are stacked alternately in a mold shaped like the desired abrasive body, and after compression molding, The abrasive body is produced by sintering under temperature and pressure.

Further, the abrasive body manufacturing apparatus of the present invention includes at least one first suction/conveyance device operated by vacuum, and at least one second suction/conveyance device also operated by vacuum, The first suction and conveyance device has a suction plate that suctions and conveys the metal layer undergoing the sintering process, and the second suction and conveyance device has a large number of abrasive particles distributed and arranged with respect to each other according to a predetermined geometric pattern. It is equipped with a suction plate that sucks and holds the product.

Further features of the present invention will be described below with reference to the accompanying drawings.

[0008]

[Operation] The suction plate can be formed to match the shape of a desired abrasive body, and the abrasive particles can be distributed according to a desired geometric pattern.

[0009]

Therefore, according to the present invention, the degree of freedom of the desired abrasive body shape, the degree of freedom and uniformity of the distribution shape of abrasive particles are dramatically improved, and the life of the abrasive body for abrasive tools and the abrasive This can contribute to improving performance.

0010

[Embodiment] Fig. 1 is a schematic diagram of an abrasive body manufacturing apparatus 75 used for abrasive tools such as drill bits, circular saws, etc., tools for abrasive processing of stone, marble, concrete, etc., and its functions will be explained. This is a diagram for

The abrasive body manufacturing device 75 includes a support device 4 that supports the devices 1, 2 and 3 disposed thereon at certain intervals.
The basic elements of the apparatus include containers 10, 11, and 12, which are arranged in a corresponding positional relationship with respect to these apparatuses.

The two devices 1 and 2 are configured as suction/conveyance devices, each of which is connected to a vacuum generator 5 via vacuum piping 1' and 2' for operation. Hereinafter, this suction/conveyance device 1 will be referred to as a first head, and the suction/conveyance device will be referred to as a second head.

Control means (not shown) are provided so that the suction force by the first head 1 or the second head 2 can be interrupted separately and for a short time in order to transport the parts suctioned and held by them. controlled by

[0014] Also, this vacuum generator 5 has the following functions in order to release the parts held by the first and second heads 1 and 2:
It would be desirable to be able to control the supply of short and slight surges of compressed air during interruptions in vacuum operation. The shapes of the first and second heads 1 and 2 are shown in FIG.
This will be explained in detail later with reference to FIG.

The device 3 is designed and arranged as a compression molding head and is operated by being connected to a pressure source 6 via a line 3'. Hereinafter, this compression molding head will be referred to as the third head.

As the support device 4, a sliding device used in the operation technology of industrial robots and the like is used. This sliding device can be adjustably moved in the directions of arrows X and X' by means of a moving device (not shown). . This X, X'
In addition to the movement in the direction, the first, second and third heads 1, 2 and 3 arranged on the sliding device move relative to the sliding device in the direction of arrows Z, Z' (Fig. (not shown). These X, X' and Z
, Z' directions are preferably carried out separately, but it is also possible to combine their movements if desired.

In FIG. 1, the first container 10, shown in perspective, is provided with a mold 45' corresponding to an abrasive blank 45 to be manufactured. The particular shape of the abrasive body 45 will be described below with reference to FIG.

The second container 11 is a supply container containing a large number of sinterable metal flakes 11' to be sintered. These metal flakes are preformed to match the shape of the abrasive body 45.

The third container 12 contains diamond powder 12'.
, a supply container for fine abrasive particles such as diamond chips. This third container 12 is preferably connected to a vibration device 13, which is not shown schematically. Further, it is desirable that the third container 12 be heated to an appropriate temperature by a device (not shown) for neutralizing the so-called residual magnetism of the diamond particles 12'. Since the diamond particles 12' are constantly vibrated by the vibrating device 13, the diamond particles 12' are kept loose and not hardened together.

FIG. 1 shows that the first and second heads 1 and 2 are connected to a container 1.
1 or 12 in the direction of arrow Z', return to their initial position, and are now able to move in the direction of arrow X'. In this process, the individual sinterable metal flakes 11'' inside the container 11 are attracted by the suction force S,
It is held by the first head 1. Further, the diamond particles in the container 12 are attracted by the suction force S' and held by the second head.

FIG. 2 is a diagram showing a part of the abrasive body manufacturing apparatus 75 in the first conveyance position, in which the first head 1 receives the suction force S.
The sinterable metal flake 11 will undergo a sintering process by
This sinterable metal thin piece 11'' is inserted into a mold for forming the container 10. The sinterable metal flakes 11'' are appropriately positioned and stacked in the mold by cutting off the suction power supply to the first head 1 for a short time.During this time, the second head 2
A suction force still acts on the diamond particles, whereby the diamond particles are held by the second head 2. The first head 1 may suck a thin layer of sinterable metal powder and insert it into the container 10 instead of the sinterable metal flake.

FIG. 3 is a diagram showing a part of the abrasive body manufacturing apparatus 75 in the second conveyance position, in which the first head 1 is placed in the container 10.
, and the second head 2 attracts and holds the diamond particles 12'' by the suction force S'.The second head 2 holding the diamond particles 12'' is shown.
A certain position, for example, the last inserted sinterable metal flake 1
1" or the position touching the sinterable metal layer, the supply of suction force to the second head 2 is stopped for a short time, so that the diamond particles 12" touch the sinterable metal flake 11" or the layered metal powder. Laminated.

The diamond particles 12'' are released from the suction plate provided in the second head 2 by supplying a surge of compressed air for a short period of time. The size of the diamond particles 12'' may be such that a certain geometric pattern can be maintained on the sinterable metal flake 11''. Determined by the special shape of the plate.

The operation of repeatedly stacking the layers of the sinterable metal flakes 11'' and the diamond particles 12'' described above with reference to FIGS. 1 and 2 is continued until the thickness of the abrasive body reaches a predetermined height. .

What I would like to point out at this point is that in addition to the second head 2, there is also another second head (not shown).
may be provided on the support device 4. The plurality of second heads are provided with different suction plates, thereby making it possible to form diamond particle layers with different geometric patterns. The individual suction plates for forming layers of diamond particles 12'' in different geometric patterns will be described in detail below with reference to FIG.

FIG. 4 is a diagram showing still another part of the abrasive manufacturing apparatus 75, and shows a state in which materials for the abrasive body 45 are stacked in the container 10. Adjustable measuring and controlling means 70 detects whether the stacked height of the abrasive bodies has reached a predetermined height. This stacking operation carried out by the first and second heads 1 and 2 is stopped by appropriate control signals from the control means 70.

The stacked materials of the abrasive body 45 are then compression-molded by the third head 3. FIG. 4 shows the container 10
It is shown that a force is about to be applied from the pressure source 6 in the direction P to the materials stacked on the surface.

FIG. 5 shows an enlarged sectional view of the first head 1 according to the present invention. The housing 21 is shaped like a funnel and includes a vacuum chamber 24 . Its top part is provided with a channel 21' narrowing in the direction of suction, while its bottom part is
A holding part 21'' for receiving the suction plate 22 is provided.The suction plate 22 is held by a holding means (not shown) on the holding part 22'' so as to form a substantially flat surface 22', and the suction plate 22 is held through this surface. It has many holes.

FIG. 6 is a plan view of the suction plate 22 taken along line VI--VI in FIG. 5, and the suction plate 22 is formed as a circular ring arc having a plurality of holes 23 spaced apart from each other. . Although the holes 23 can be arranged in any manner on the suction plate 22, it is preferable that they are uniformly distributed over the surface of the suction plate.

The suction plate 22, in particular the one used for suctioning the layered metal powder, is provided on the side remote from the vacuum chamber 24, so that its cross section has a concave surface 22'.

FIG. 7 shows an enlarged sectional view of the second head 2 according to the present invention. The housing 25 is shaped like a funnel and includes a vacuum chamber 26. At its top there is a suction direction S'
A narrow channel 25' is provided in the lower part, while a holding part 25'' is provided in the lower part for receiving the suction plate 30, 35, 40 or 41. A large number of holes are provided through the suction plate 30, 35, 40, or 41 held by means not shown.Although not particularly shown, the suction plate 30, 35, 40, or 41 is It is desirable that the fixture for fixing the suction plate be of a structure that allows the suction plate to be replaced.

FIG. 8 is a plan view of suction plates 30, 35, 40, and 41 formed as arcuate circular rings with through holes distributed in different distribution states or positional relationships. The arrangement of these through holes on the suction plate, basically the arrangement with respect to the center line M, will be described below.

The suction plate 30 is located at the outer edge 30' of the arc-shaped body.
In the area of the inner edge 30'', two holes 28' and 28'' are located at a uniform distance and are located along a line 28 towards the center of the arc.
A plurality of holes 28', 2 are arranged opposite to each other on the top.
8'', and further includes a hole group 29 consisting of holes 29', 29'' arranged in a star shape. One of the holes in the hole group 29 is located on the center line M, and the other two holes are arranged equidistant from the center line M. Both left and right ends of the suction plate 30 according to this embodiment are formed in an arc shape with radii 27 and 27'.

The suction plate 35 is located at the outer edge 35' of the arc-shaped body.
It has a plurality of holes 32' and 32'' arranged at a uniform distance in the area of the inner edge 35'', and a hole 34 is arranged on the center line M in correspondence with these holes 32' and 32''. . Three holes 3 facing each other on a line 32 toward the center of the arc
2', 32'' and 34 are provided with three holes 33', 33'' constituting a star-shaped hole group 33. One hole 33' of the hole group 33 is located on the center line M, and the other two holes 33'' are arranged to be equidistant from the center line M. Both left and right end portions 31, 31' are formed into a wedge shape.

In the suction plate 40, holes 37 are arranged at uniform distances in the area of the outer edge 40' of the arc-shaped body, and holes 38 are arranged at uniform distances in the area of the inner edge 40'' of the arc-shaped body. The holes 38 located in the inner edge 40'' are spaced apart.
It is arranged so as to take a position shifted from the hole 37 arranged in the outer edge portion 40'. Further, the holes 37' and 38' are arranged on the center line M, and the holes 37" and 38" are further arranged on the center line M.
7 and 38. Both left and right ends 36, 36' of the suction plate 40 according to this embodiment are separated by a center line extending toward the center (not shown) of a circular ring.

The suction plate 41 substantially corresponds to the above-described suction plate 40, and the holes 37' and 38' are arranged on the center line M, and the holes 37'' and 38'' are arranged in correspondence with them.
is located. The difference from the suction plate 40 is that the suction plate 41 has an arc outer edge and an inner edge 41', 41''.
The point is that there are no holes.

As mentioned above, the suction plates 30, 3
By arranging the holes in 5, 40 and 41 according to a geometric pattern, it is possible to regularly take in and transport the diamond particles 12''.The abrasive body 45 therefore has a homogeneous structure. Since it is essential to collect the diamond particles 12'' in the centerline area of each of the suction plates 30, 35, 40 and 41, during drilling the outer edges of the abrasive body that hit the workpiece wear out first. As a result, a substantially wedge-shaped abrasive surface is formed, resulting in good centering of the drill bit.

FIG. 9 is an enlarged sectional view of the abrasive body 45, showing the diamond particles 12'' spaced apart from each other and embedded in the metal layer 11''. A metal layer 47 is attached to one side of the abrasive body 45 as part of a multilayer structure;
The abrasive body is welded to the holding member 55 (FIG. 10) through this layer.

FIG. 10 shows an embodiment of a tool according to the invention. The drill bit 50 includes a plurality of abrasive bodies 45 uniformly arranged along its circumference. According to one example, the holding member 55 may be formed of a tubular body, and the abrasive bodies 45 may be fixedly disposed along the circumference of the end thereof at intervals 46 by brazing or welding.

The manufacturing process of the abrasive body 45 using the abrasive body manufacturing apparatus 75 according to the present invention is as follows. (B) Lower the first head 1 in the direction of arrow Z, insert it into the container 11, and use the suction action of the suction plate 22 of the first head 1 to suck and hold the sinterable metal layer 11'' or the layer made of metal powder. while moving the first head 1 in the direction of arrow Z'.
(b) The second head 2 is lowered and inserted into the container 12, and a large number of diamond particles 12 are removed by the vacuum action in the suction plate 30, 35, 40, or 41 of the second head 2. ”
While suctioning and holding the second head 2, pull it up in the direction of arrow Z' and return it to its initial position; (c) actuate the support device 4 to move it in the direction of arrow X; then lower the first head 1. Insert the object to be absorbed into the container 10, interrupt the suction force on the suction plate 22, and then
The sinterable metal layer 11'' is released into the container 10 as shown in FIG. The second head 2 is lowered and inserted into the container 10, and the suction plate 3 is inserted into the container 10.
0, 35, 40, or 41 and remove the diamond particles 12'' from container 1 as shown in FIG.
0 onto the sinterable metal layer 11'' inside the abrasive body 45, and then return the second head 2 to its initial position. Then, as shown in FIG. 4, the abrasive blank is compression-molded by the third head 3, and (f) is heated to an appropriate temperature according to a known metal sintering process.
The individual abrasive blanks are subjected to a sintering process under appropriate pressure.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an abrasive body manufacturing apparatus according to the present invention,
The figure which shows the state in its initial operating position.

FIG. 2 is a diagram showing a part of the abrasive body manufacturing apparatus of FIG. 1 in a first conveyance position.

FIG. 3 is a diagram showing a part of the abrasive body manufacturing apparatus of FIG. 1 in a second conveyance position.

FIG. 4 is a diagram showing a part of the abrasive body manufacturing apparatus of FIG. 1 in a third position.

FIG. 5 is a sectional view of the first suction/conveyance head used in the abrasive body manufacturing apparatus of FIG. 1.

FIG. 6 is a schematic plan view of the suction plate of the first head in FIG. 5;

7 is a sectional view of a second suction/conveyance head used in the abrasive body manufacturing apparatus of FIG. 1. FIG.

FIG. 8 is a plan view of the embodiment of the suction plate of FIG. 7;

FIG. 9 is an enlarged sectional view showing the structure of the polishing body.

FIG. 10 is a perspective view of a drill bit equipped with an abrasive body according to the invention.

[Explanation of symbols]

1 First head 2 Second head 3 Compression head 4 Support device 10 Molding mold 11 Burnable metal layer (thin flake) 12 Abrasive particles 22 Suction plate 23, 28', 28", 32', 32", 40 ', 40
” Through hole 24 Vacuum chambers 30, 35, 40, 41 Suction plate 45 Abrasive body 50 Drill bit 55 Holding member for the abrasive body

Claims (10)

[Claims] 1. A method for producing an abrasive body for an abrasive tool, in particular an abrasive body for an abrasive tool that is used while rotating, the abrasive body comprising a mixture of metal powder and at least one of natural and synthetic abrasives. In order to impart a highly homogeneous structure to the abrasive body (45), a plurality of sinterable metal layers and a plurality of abrasive particles (12") are distributed according to a certain geometric pattern with respect to each other. An abrasive for an abrasive tool in which the abrasive material layer is laminated in a mold (10) for forming the desired abrasive body shape, compression molded, and then sintered at an appropriate temperature and high pressure. How the body is manufactured. 2. The abrasive body for an abrasive tool according to claim 1, wherein a plurality of abrasive layers and sinterable metal layers in which different types of abrasive particles (12'') are mutually distributed according to a geometric pattern are laminated alternately. manufacturing method. 3. The sinterable metal layer sucked from the corresponding container and the layer of abrasive particles sucked according to the geometric pattern are adsorbed and held by the corresponding holding device until released into the forming mold by vacuum action. A method for manufacturing an abrasive body for an abrasive tool according to claim 1 or 2. Claim 4: The sinterable metal layer is a sinterable metal flake (11
”) is loaded into the mold (10) for forming,
The method for manufacturing an abrasive body for an abrasive tool according to any one of 2 and 3. 5. A sinterable metal layer or a sinterable metal flake (
11") and abrasive particles (12") are released from the holding device by a slight surge of compressed air acting on them for a short time, and the abrasive particles are stably distributed on the corresponding sinterable metal layer. 3. The method for manufacturing an abrasive body for an abrasive tool according to claim 1 or 2, wherein: . [Claim 6] Preformed sinterable metal flakes (11
'') and the abrasive particles (12'') arranged thereon according to a certain geometric pattern form an arcuate, wedge-shaped or straight end at at least one end of the finished abrasive body. , 2, 3, 4, and 5. The method for manufacturing an abrasive body for an abrasive tool according to any one of items 2, 3, 4, and 5. 7. An abrasive device for carrying out the method for manufacturing an abrasive body for an abrasive tool according to any one of claims 1 to 4, comprising a support device (4) that adjustably supports the horizontal or vertical feed motion of a plurality of suction/conveyance devices. An apparatus for manufacturing an abrasive body for tools,
It comprises at least one first head (1) operated by vacuum action and at least one second head (2) also operated by vacuum action, the first head (1) comprising a sinterable metal layer or a sintered metal layer. suction of a metal flake (11”)
It is equipped with a suction plate (22) for holding the second head (2
) is an abrasive body for an abrasive tool that is equipped with suction plates (30, 35, 40, 41) that attract and hold a large number of abrasive particles (12") so that they are distributed and arranged according to one geometric pattern. manufacturing equipment. 8. The first head (1) and the suction plate (22) attached thereto are formed in the shape of a circular ring, and the suction plate (22) has a plurality of through holes (23) distributed therein. 8. The apparatus for producing an abrasive body for an abrasive tool according to claim 7, wherein the abrasive body is connected to the vacuum chamber (24) of the first head (1). 9. The second head (2) and the suction plates (30, 35, 40, 41) attached to it are formed in the arc shape of a circular ring.
0, 41) are connected to the vacuum chamber (27) of the second head (2) through a large number of through holes distributed in a group with almost symmetry with respect to the center line (M). The apparatus for manufacturing an abrasive body for an abrasive tool according to claim 7. 10. In addition to the through holes distributed in groups along the center line (M), the suction plates (30; 35 and 40) have outer and inner curved edges (30'30'';
Holes (28', 28";32',
10. The apparatus for manufacturing an abrasive body for an abrasive tool according to claim 9, wherein the abrasive body has a diameter of 32'';40',40''.