JP2000354968A - Centrifugal molding method of disc type molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding method of a disc type molding favourable in dynamic balance at the time of high speed rotation, homogeneous in the circumferential direction and having a different characteristic in the normal direction a composite material disc body constituted of a resin bond grinding wheel and a composite material such as various powder, particulates, etc., and to be used as a rotor. SOLUTION: A centrifugal molding method of a disc body constitutes a mold with a ring body 5 by inserting two pieces of flat surface type discs and the ring body 5 made of a resin etc., to transfer an outside diameter, plate thickness and an outer peripheral part shape of a molded body to the molding into a cylindrical jig, injecting a mixed material into a space provided by the disc 3 and the ring body 5, giving the number of rotation in consideration of rotational dynamic balance, when a finished article of the molding is used, to a jig body 1 and gradually maldistributing respective layers of powder and particulates in the mixed material at required positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial application field] When a disc-shaped product made of a composite material is used as a high-speed rotating body, it has good dynamic balance, that is, good dynamic balance, and has a necessary optimum function. A method of forming a disc-shaped molded article.

2. Description of the Related Art A forming method using centrifugal force includes a method of spraying and solidifying a molten casting on the inner surface of a rotating cylindrical jig (mold) such as a cast iron pipe, and a method of forming a molten metal into a mold by a vertical casting machine. A centrifugal casting method for casting a ring body such as a cast piston ring is well known. In the case of non-metals, there is a method in which resin and reinforcing fibers are sprayed on the inner surface of a rotating cylindrical jig to form a tubular resin product by centrifugal force. is not. In addition, disc products manufactured from powders and the like are mixed with various fine powders, binders, plasticizers, reinforcing materials, etc.
There is a method in which a molded body (green) is produced by a method such as injection molding, then unnecessary organic substances are removed, and then sintering is performed. However, since the material is supplied to the mold as it is in a kneaded state, Even if an important kneading step is successful for improving quality, it is difficult to obtain homogeneity in the plane, and it is difficult to have different properties in the normal direction.

[0003] The disc-shaped grindstone herein refers to a disc-shaped diamond or CBN abrasive grindstone used for precise cutting, grooving, surface grinding, forming grinding, and the like. A super-abrasive grindstone has an abrasive layer around the outer periphery of an iron-based or Al-based carrier, and a resin-bonded grindstone in which diamond abrasive grains and cBN abrasive grains are bonded with a thermosetting resin. There are a vitrified bond grindstone, a metal bond grindstone using a metal bond, an electrodeposition grindstone for attaching abrasive grains to the outer peripheral portion of the carrier by nickel plating or the like.

[0004] In the future, it is expected that demands for weight reduction, high strength, high rigidity, good rotation balance, good heat conduction, etc. of the grinding wheel itself will increase with the increase in the rotation speed of the grinding wheel. It is considered that the necessity of a super-abrasive grindstone, particularly a resin bond grindstone and a vitrified grindstone, having an abrasive layer on an outer peripheral portion using CFRP or the like as a carrier (core) increases. Normally, when a grindstone is used at high speed rotation, it is troublesome to adjust the rotation balance with a carrier part or a grindstone flange.

[0005] Resin bond whetstones are made of diamond or cBN.
Is a grinding stone in which the abrasive grains are dispersed and fixed to the outer periphery of the carrier with a thermosetting resin binder. As a manufacturing method, for example, an abrasive grain layer is formed on the outer peripheral portion of a disc-shaped carrier made of Al by a doctor blade method, an injection molding method, or the like, and is fixed by heating and pressing.

However, in the case of variation in the curing of the resin or uneven kneading, it is difficult to fix the abrasive grains uniformly and evenly on the outer peripheral portion or to sufficiently dispose the abrasive grains at important edge portions. This causes problems such as a decrease in the grinding performance of the grindstone and an early sag at the corner.

[0007] Diamond in the form of fine powder is liable to agglomerate, and it is difficult to precisely adjust the particle size for each mesh. Therefore, the whetstone manufactured by the above-mentioned method for manufacturing whetstones has a variation in particle size and concentration on the abrasive grain surface. There are many irregularities, which greatly affect the grinding performance, grinding accuracy, and finished surface roughness of the grinding wheel.

[0008] For example, iron-based materials are often used in the reliability of products, such as stable performance, heat resistance, and frictional characteristics, such as brake wheels of disk brakes, which can withstand frequent use. However, there is a problem in weight reduction. Further, in order to increase energy efficiency at the time of braking, a structure, a shape and a material having good cooling efficiency such as water cooling and air cooling are required. In particular, in the case of brake wheels of a transporting engine, there is an unavoidable problem of reducing the weight of a vehicle body for speeding up and energy saving. At present, some MMCs made of Al alloys and ceramic particles have been used as brake wheels in automobiles.

Usually, when producing a powder alloy, various powders whose distribution is adjusted are mixed and stirred. After that, since it is inserted into a mold to form a molded body by press molding or the like, the mixing and stirring step is very important. That is, it is necessary to stir so as to uniformly disperse and mix the respective particles as a whole to eliminate defects during molding, but it is technically difficult.

[0010] Further, since the molded body is brittle, it is necessary to be careful in handling, and it is easily deformed in the degreasing step, which is very troublesome in operation.

[Problems to be Solved by the Invention] A method of unevenly distributing fine particles by using centrifugal force is well known, and the present invention basically applies this method. The method of the present invention is to provide a method for producing a molded body that is homogeneous, has a gradient in the above characteristics, and has a good rotational balance when a finished product is used.

Various methods have been proposed for forming a disk-shaped rotating body, such as molding of a grindstone by injection molding and powder molding using centrifugal force. The present invention relates to a resin-bonded grindstone, in which a mixed material is injected, and centrifugal force forming is performed by a rotation speed in consideration of a dynamic balance at the time of rotating use of a finished product. In the ring body that transfers and forms the outer shape of the resin, it is used for the purpose of easy handling of the brittle molded body after molding and prevention of deformation at the time of degreasing, and after baking, resin that can be burned down with other binder resin The feature is that is used as a type.

By manufacturing a molded article by utilizing the centrifugal force of the present invention, it is possible to disperse and assemble the particles in the circumferential direction and the radial direction so that the specific gravity and the particle size are uniform, and to make the density uniform. A molded article having an abrasive layer on the outer peripheral portion and a layer having the required performance as a carrier on the central portion can be manufactured as a grindstone capable of solving the above-mentioned problems.

In the centrifugal force molding conventionally proposed, the uneven distribution of particles can be achieved due to the dependence of each particle on the centrifugal force. The number of rotations is not set in consideration of good rotation balance. At the time of high-speed rotation, it is natural that the shape accuracy of the disk has a great influence on the rotational balance, but in the case of a powder compact, etc., the weight can be balanced in any plane in the circumferential direction of the disk, The lack of eccentricity of the center of gravity is also important for a high-speed rotating body.

Therefore, the centrifugal molding method of the present invention is designed to reduce the rotational speed in consideration of the dynamic balance when the product is used, for example, the maximum rotational speed at which the product is used, at the stage of molding the target product. In general, the combined number of revolutions is given to a mold, that is, a so-called mold, and centrifugal molding is performed so that a uniform weight distribution is performed in a circumferential surface. However, this does not take into account the evenness and imbalance with the rotating machine that uses the finished product.

Naturally, in the case of a product used at a low rotation speed or a disk having a small external shape and a small thickness, there is little need to consider the state of dynamic balance during rotation. It is only necessary to apply a centrifugal force depending on the number of revolutions to satisfy the above characteristics.

That is, in the molding method using centrifugal force of the present invention, the flow characteristics of each particle due to the centrifugal force acting on the molded body before hardening and firing the granules and powder, that is, the particle size of each material particle It is difficult to satisfy the above characteristics by other methods, such as press molding and injection molding, which utilize the dependence on the diameter, the particle solid density, the volume ratio of each particle, and the adhesion characteristics of the fine particles. It is for producing a discoid body. In other words, it is uniform in the circumferential direction, from the outer part to the center part in the normal direction, and has any necessary characteristics. A molded article is manufactured for the purpose of improving the dynamic balance of the molded article.

[Means for Solving the Problems] The molding of the present invention is performed by a system shown in the overall explanatory view of FIG.
The process 1 is a cylindrical jig 2, disks 3 and 4 and a ring 5.
More specifically, each of the circles is mounted on the turntable 7 such that the center of each circle coincides with the center of rotation of the turntable 7.

The turntable 7 is rotated at a required number of revolutions using an electric motor (not shown) or the like. The ring bodies 5 sandwiched between the disk bodies 3 and 4 are both freely inserted into the cylindrical jig 2 and the ring bodies 5 are fixed to the disk bodies 3 and 4 by a physical method (not shown). Pushing at pressure P.

The space 6 formed by the inner diameter sides of the disk 3, disk 4 and ring 5 is a molding place. The thickness of the molded body is restricted by the thickness b of the ring body 5, and its outer dimensions and shape are restricted by the portion 5 a of the ring body 5.

Various materials S11 and S2 are contained in the tank 8.
A mixed material in which 1, 1,..., Sm1 are kneaded is contained. In addition, depending on the degree of the required organizational change, for example, S11, S12,.
As shown in 1n, materials having different particle sizes and shapes are mixed.

The disk 3 is provided with an inlet 3a for the mixed material. The mixed material is injected from the injection port 3a and is formed by centrifugal force at the time of rotation of the turntable 7 to obtain a formed body 20 together with the ring body 5.

In the case of a powder compact, the ring 5 on the outer periphery of the compact 20 is burned off in a firing step to obtain a product 21.
In the case of a molded body using a thermosetting resin as a binder, the ring body 5 is cut off by a mechanical or thermal method, or is separated from the cured molded body 20 as a split-type ring body. 21 is obtained.

Example 1 A super-abrasive grain such as diamond or CBN will now be described with reference to a figure using a molded body using the present apparatus. As shown in FIGS. 2 and 3, in the abrasive grains, a layer having a uniform particle size in the circumferential direction of the outer periphery of the grindstone is uniformly generated. By combining and adjusting the type and size of the binder and the reinforcing material, etc., it is possible to produce a high-toughness, high-strength, high-performance grindstone of the whole grindstone including the carrier.

As shown in FIG. 4, the surface of a normal whetstone has irregular sizes of abrasive grains and uneven distribution of abrasive grains.
It greatly affects grinding performance. In addition, as shown in FIG. 5, the edge portion has particularly large irregularities in the abrasive layer, and when grinding is performed using a rough grindstone, the edge portion is greatly worn, which affects the grinding performance and consumes expensive grinding wheels. It becomes bald. In addition, the same problem occurs when the rotation balance of the grindstone during high-speed rotation is poor.

As shown in FIG. 6, the grindstone manufactured by the molding method of the present invention has a uniform grain distribution on the surface of the grindstone and a uniform distribution of abrasive grains. As shown in FIG. 7, since a uniform abrasive layer is formed even at the edge portion, the grinding wheel is sharp, has little wear, and has a high quality cutting edge.

The difference in specific gravity between the abrasive and the other mixture due to centrifugal force,
Since the difference in grain size is utilized, the concentration of the abrasive grains at the periphery of the grinding wheel is uniform, and the carrier has the required characteristics as a carrier. In the circumferential direction, molding with good in-plane weight balance can be controlled. A high quality grinding wheel with good dynamic balance during rotation can be manufactured.

The outer peripheral portion forming grindstone refers to, for example, a grindstone formed body having a V-shaped cross section in the thickness direction of the outer peripheral portion of the grindstone as shown in FIG. In the case of a V-shaped grindstone manufactured by a usual method, it is difficult to uniformly and densely place abrasive grains at an important V-shaped tip in the circumferential direction, and grinding is performed using a rough grindstone. Then, there is a problem that the V-shaped top portion is severely worn and the interval between truing and dressing of the grinding wheel is shortened. However, according to the method of the present invention, at the V-shaped tip ridge portion of the ring body having a shape for transferring the outer peripheral portion, abrasive grains are densely and uniformly accumulated, and a grinding stone with less concentration defect can be formed. .

Further, a small R shape is formed on the outer periphery, such as a profile grinding wheel (not shown), and the effect is exerted even when the shape wear is not preferable during grinding. In grinding, it is preferable to increase the number of abrasive grains per work for the durability of the abrasive grains, but in practice, especially when increasing the concentration of fine abrasive grains, chip pockets between each abrasive grain decrease and clogging is likely to occur Cause the problem of becoming Conversely, during grinding, the phenomenon is that the abrasive grains are crushed and the cutting edge abrasive grains are reduced so that the sharpness is improved, but this is at the expense of the abrasiveness of the grindstone, long time This is not preferable for grinding and polishing operations that require good shape retention and precision.

In particular, when cutting or precise groove processing is performed with a thin grindstone, the above-mentioned problem becomes a fatal problem.
In addition, small grooves may be formed in the outer portion for the purpose of functioning as a chip pocket and efficient use of a grinding fluid. In such a case, a grindstone with few defects can be manufactured.

In the blank molding before curing by the present method,
A disk-shaped jig (mold) with an arbitrary outer shape and thickness.
For example, it goes without saying that the present invention can also be applied to the manufacture of a grindstone formed by inserting a carrier (core) of a reinforcing long fiber-shaped body in advance and forming the same by the same method.

Example 2 Next, as an example, iron powder, Al alloy powder, ceramic powder, and reinforcing material that are basically distributed and adjusted to satisfy the characteristics required for the brake wheel. When a molded body made of a mixed powder such as short fibers such as whiskers is produced by the method of the present invention, an iron-based powder body is provided on the outer periphery, and a high-density distribution layer of an Al alloy-based powder body is provided from the center to the center.
It is possible to manufacture a molded article having a distribution layer of the reinforcing material as a whole for the purpose of reliability and weight reduction. Next, a description will be given based on the drawings.

In FIG. 9, 31 is a disk brake wheel,
32 is a lining. The brake wheels become hot when the brakes are activated, which greatly affects the braking performance. Also, the heat effect from the brake wheel bearing cannot be ignored.

Regarding the radial position of the brake wheel, a large amount of iron-based powder is disposed on the outer peripheral side in consideration of friction characteristics, durability reliability, strength, low expansion properties, heat resistance, etc., and heat conduction from the center to the center. A large amount of Al alloy-based powder is disposed in consideration of the properties, strength, weight reduction, etc., and layers of ceramic type powder, reinforcing short fibers, etc. are mixed throughout in consideration of weight reduction, toughness, and heat resistance.

FIGS. 10 and 11 show the rough layer division of each powder. In a case where the particles are mixed in the normal direction, for example, the iron-based powders 33a, 33b, and 33c near the outer periphery, and the Al alloy powders 34a, 34b, and 3 from the center to the center.
4c, many ceramic powders 35 are unevenly distributed. Since the difference in specific gravity and particle size of each powder can be used by the centrifugal force, the degree of mixing of each layer such as an iron-based or Al-based layer can be controlled, and a product having a uniform layer at each circumferential portion can be manufactured. Since the centrifugal force is formed by the rotation speed in consideration of the rotational dynamic balance when using the finished product, the balance does not need to be adjusted during use, and the brake wheel has an inclination characteristic.

Example 3 In addition, although there is an unintended variation in the size of the particles applied to the proposed powder molding including the centrifugal molding method, the same type of particles is used, However, in the present invention, in order to effectively utilize the particle size dependence due to the centrifugal force, each particle of the same type is also used in FIG.
Some sizes and shapes are also adjusted like the powders 33a, 33b, and 33c in FIG.

Concentration density of each layer is continuously and gradually changed in the normal direction by blending several particles of the same kind with different particle sizes to adjust the characteristics and to strengthen the bonding between the particles. Can be done.

In the case of fine particles, the influence of gravity is almost negligible, so that only the effect of centrifugal force needs to be considered, and the thickness of the compact becomes uniform in the thickness direction. By selecting a sufficiently small particle size for the ceramic powder, the reinforcing short fiber, etc., each of them is dispersed and bonded to the whole while adhering to the iron-based or Al-alloy-based powder.

Further, as described above, by taking out the ring body together with the powder compact, the ring body serves as a reinforcing material for the brittle compact, which is easy to handle, and is used to prevent deformation in the degreasing step performed as necessary. Also. Further, since the general ring body can be burned out together with other unnecessary organic substances in the firing step, the process can be simplified and the efficiency can be measured.

In the molding method of the present invention, the centrifugal force is used, so that the disc-shaped molded article can be formed in any part of the circumferential direction and the normal direction, for example, when the mixed and stirred particles are injected into the mold.
Even if it is somewhat uneven, each layer becomes uniform because the respective particles having different specific gravities and particle sizes are positively aggregated in the molding stage, and each layer becomes uniform, irregular aggregation and uneven distribution of particles Also, by using a porous material having a fine pore diameter for the ring body, defects such as intervening of many pores can be prevented.

In the example, iron or Al alloy was used, but other powders or granules applicable to powder molding may be used. That is,
The powder molding method according to the present invention can be applied to the molding of a rotating disk using a composite material in which different kinds of metal and nonmetallic powders are mixed. Further, by pressing the molded body as required, a molded body with higher density can be manufactured.

Example 4 Also, in forming a blank before sintering a cemented carbide frequently used for cutting tools such as a metal saw and a rotary knife, it is possible to produce a product having extremely few defects in the plane.
In particular, normal powder molding is performed by press molding, injection molding, etc., but fine powder powder has high friction resistance with the mold, high friction resistance between powders, and poor fluidity, so in the case of thin disk-shaped parts, It is difficult to produce a homogeneous and high quality blank before sintering.

When a hard disk (not shown) having a thickness of, for example, 0.3 mm or less is subjected to powder molding by the above-described conventional method, the powder is often formed in a coarse state before the powder molding.
This leads to deterioration in quality such as distortion during firing, distortion during grinding, and reduction in strength, resulting in poor product yield. So usually
Since the sintered product before the grinding process has a large finishing allowance, there are many disadvantages that a long grinding time is required and a processing distortion is generated.

According to the method for producing a molded article before sintering of the present invention, unlike the method of molding only by pressing in the thickness direction, two parallel flat disks having a small gap are formed. In the jig, fine powder diffuses from the center to the outer periphery by centrifugal force and is constrained by a ring of arbitrary dimensions,
The whole can be filled with honey, and the problem with the conventional method can be solved.

The obtained plate thickness is formed by the thickness of a ring made of a resin or the like that can be manufactured at a low cost, and is burned off together with the binder resin, so that post-processing is easy. It goes without saying that this method can be applied not only to the products mentioned in the examples but also to various parts that require the features according to the present method.

[Effects of the Invention] The method of the present invention comprises a so-called vitrified bond grindstone for forming a diamond, CBN abrasive or the like into a predetermined shape with a vitrified binder together with a reinforcing material such as whisker, A super-abrasive grinding wheel with high performance and good dynamic balance can be manufactured for resin-bonded grinding wheels bonded with resin.

The feature that there is little defect in the degree of concentration of the abrasive grains in the edge portion is that it is a very effective forming method because it has a long grinding time with little sag at the corners of the grindstone and can withstand high-precision grinding for a long time. It is easy to manufacture a super-thin grindstone or a grindstone having an arbitrary shape on the outer periphery. In addition, the truing interval becomes longer, and high precision and high efficiency of the grinding work can be measured.

The finished product of the composite material disk formed by the method of forming a composite material disk according to the present invention has good dynamic balance during rotation, is uniform in the circumferential direction and plate thickness direction in any plane, and is uniform in the normal direction. Products with different characteristics.

Further, as described above, when the ring body is taken out of the jig together with the powder compact, the ring body serves as a reinforcing material for the brittle compact, is easy to handle, and is deformed in the degreasing step performed as necessary. It also acts as a barrier. Further, since the general ring body can be burned off together with other unnecessary organic substances in the firing step, the process can be simplified and the efficiency can be improved.

Since the thickness of the disc-shaped molded body depends on the thickness of a separately-processed and precision-processed ring body, the molded body can be manufactured with little deviation in thickness at an arbitrary position in the plane.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram of a centrifugal molding method for a disk-shaped molded body of the present invention.

FIG. 2 is an explanatory view showing a state of a resin-bonded grindstone in Example 1.

FIG. 3 is an image diagram showing a layer distribution of each material from the center to the outer periphery of the grinding wheel in the first embodiment.

FIG. 4 is an explanatory view showing a state of an outer peripheral surface of a grindstone manufactured by a conventional method.

FIG. 5 is an explanatory view showing a state of an outer peripheral edge portion of the grindstone shown in FIG. 4;

FIG. 6 is an explanatory view showing the appearance of the outer peripheral surface of the grinding wheel of the present invention.

FIG. 7 is an explanatory view showing a state of an outer peripheral edge portion of the grindstone shown in FIG. 6;

FIG. 9 is an explanatory view of a disk brake.

FIG. 10 is an explanatory view showing a state of a disk-shaped molded body formed by the method of the present invention.

11 is an image diagram showing a distribution layer of each powder from the center to the outer periphery of the disk shown in FIG.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 Reinforcement 13 Reinforcement 2 Outer cylinder 31 Disk brake wheel 3 Disk 32 Lining 3a Inlet 33a, 33b, 33c 4 Disk Iron powder having different diameters 5 Ring body 34a, 34b, 34c 5a Ring body inner diameter shape part Each diameter Al alloy powder of different shapes 6 Molding space 35 Ceramic powder 7 Turntable 8 Mixed material tank 9 Various powders 11 Abrasive grains 11a Distribution of abrasive grains 12 Binder, reinforcing material 12a Binder, reinforcing material, etc.

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[Procedure amendment]

[Submission date] August 23, 1999 (1999.8.2
3)

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram of a centrifugal molding method for a disk-shaped molded body of the present invention.

FIG. 2 is an explanatory view showing a state of a resin-bonded grindstone in Example 1.

FIG. 3 is an image diagram showing a layer distribution of each material from the center to the outer periphery of the grinding wheel in the first embodiment.

FIG. 4 is an explanatory view showing a state of an outer peripheral surface of a grindstone manufactured by a conventional method.

FIG. 5 is an explanatory view showing a state of an outer peripheral edge portion of the grindstone shown in FIG. 4;

FIG. 6 is an explanatory view showing the appearance of the outer peripheral surface of the grinding wheel of the present invention.

FIG. 7 is an explanatory view showing a state of an outer peripheral edge portion of the grindstone shown in FIG. 6;

FIG. 8 is an explanatory diagram showing a state of an outer peripheral portion of a V-shaped grinding wheel.

FIG. 9 is an explanatory view of a disk brake.

FIG. 10 is an explanatory view showing a state of a disk-shaped molded body formed by the method of the present invention.

11 is an image diagram showing a distribution layer of each powder from the center to the outer periphery of the disk shown in FIG.

[Description of Signs] 1 Metallurgy 13 Reinforcement 2 Outer cylinder 31 Disk brake wheel 3 Disk 32 Lining 3a Injection port 33a, 33b, 33c 4 Disk Iron-based powders with different diameters 5 Ring bodies 34a, 34b, 34c 5a Ring bodies Inner shape part Al alloy powder with different diameters 6 Molding space 35 Ceramic powder 7 Rotating table 8 Mixing material tank O Center of rotation of disk 9 Various powders R Radius of disk 11 Abrasive p Pressure 11a Distribution of abrasive S11, S21, Sm1 12 Binder Any kind of powder material 12a Binder, reinforcing material, etc. Distribution of S1n, S2q, Smr Powder materials different in particle size and shape belonging to S11, S21, Sm1, respectively

Claims (3)

[Claims] 1. A method for forming a resin bond whetstone, comprising:
A binder and a plasticizer such as a thermosetting resin, a short fiber or the like as a reinforcing material according to the purpose, and a mixed material for molding obtained by adjusting and mixing abrasive grains and the like as a processing cutting edge, and a cylindrical outer cylinder. At least one of the disks has an injection hole for the mixed material in at least one of the outer cylinders, and is disposed between two parallel disk jigs and the disk. Forming a transfer shape to the outer shape of the molded body with the diameter and thickness of the molded body and a ring body for restraining the outer shape of the molded body, and a device for controlling the rotation of the metallurgy, The above-mentioned process is rotated at a rotational speed at which an optimum rotational dynamic balance is obtained when the finished product of the molded body is used, and approximately in the vicinity of its center position, through the injection hole, two disks and a ring The mixed material is supplied to the internal space constituted by the body, and the centrifugal force is applied when the jig rotates. The particle size of each material particles generated by utilizing the dependency on particle solid density, method of molding a disk-shaped grinding wheel for stacking uniform abrasive layer to outer circumference. 2. The method according to claim 1, wherein in the forming method, instead of the mixed material, various mixed materials such as powders, granules, binders, plasticizers and the like of iron, non-ferrous and ceramics, and a cylindrical outer cylinder are used. At least in the outer cylinder, between two disks having holes for inserting various powders near the center of one disk,
It has the desired diameter and thickness of the molded product and has a transfer shape to the outer shape of the molded product. It can restrain the outer diameter of the molded product and can be burned down with other binders etc. in the sintering process. The ring bodies such as resin are combined with their respective rotation centers matched, and the combined disk body is rotated at a rotation speed at which the optimum rotational dynamic balance when the finished product of the molded body is used is obtained. A mixture of various fine powders, binders, plasticizers, etc., powdered according to the purpose is supplied to the internal space composed of two disks and a ring from the hole, and is caused by centrifugal force when the jig rotates. , Specific gravity of each powder,
A disk with functionally inclined characteristics in the normal direction using diffusion and aggregation due to differences in particle size, uniform in any circumferential direction within the plane, and having a good rotational balance when using a finished product of a roughly formed body Forming method for powdery sintered body. 3. In the mixed material of different types used in the molding method, granules having different sizes and shapes are respectively blended even in the same kind of powder, and the uneven distribution density of each particle in the normal direction is positively changed, and A method in which the above-mentioned molding is performed using a mixed material for the purpose of controlling the gradual change of the characteristics, that is, the degree of change of the structure between the materials, and further strengthening the bonding between the particles.