JPS62136374A - Manufacture for grindstone and cutting tool - Google Patents

Abstract

PURPOSE:To enable the easy formation of a grindstone and a cutter without any application of pressure by using extra-fine grains generated from the hydrolytic reaction of metal alkoxide as bonding material grains. CONSTITUTION:Metal alkoxide and aqueous solution 1 mixed with water and chemicals for facilitating hydrolysis are stirred with an agitator 3 for the formation of a mixed fluid 8. This fluid 8 is poured into a mold 4 and dried naturally for the removal of water, alcohol and the like therefrom. Thereafter, the fluid 8 so dried is released from the mold 4 as a mixture 5. This mixture 5 is sintered in a small-sized heat treatment furnace, thereby obtaining a desired grindstone 6.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for manufacturing a grindstone and a cutter tool for processing such as grinding, lapping, grinding, and cutting.

"Prior Art" Generally, a grindstone has a hard layer formed on the surface of a base material called a base metal and made of a hard material called abrasive grains and a binder.

Traditionally, such grindstones have been manufactured by first mixing a clay binder or a synthetic resin binder with a hard body (abrasive grains), and then pouring this mixture into a metal containing a base material (base metal). Fill the mold and then pressurize it (100-3000KFI/ci)
) and firing.

At this time, the hard material and the binder are each crushed using a roll crusher or a crusher to a desired particle size, then weighed, and mixed in predetermined m portions using a ball mill or the like in a wet or dry manner.

``Problems to be solved by the invention'' In such conventional manufacturing methods, a pressurizing process is necessary to increase the degree of bonding of the hardened layer and to harden the hardened layer to the base material. However, for this reason, a large press gate was required even to manufacture small-sized whetstones, and there was an inconvenience in terms of manufacturing equipment that made it difficult to manufacture large-sized whetstones.

"Means for Solving the Problems" As a result of intensive research, the inventors of the present invention have developed a new method for manufacturing a grindstone and cutter tool that solves the above problems.

In other words, the manufacturing method of the present invention involves: (1) first mixing an aqueous solution to which a metal alkoxide has been added and a hard body; (2) then injecting this mixed solution into a mold or coating it on a base material made of a refractory material; (2) Next, after drying, the materials are sintered to produce grindstones or cutlery tools.

"Example" Hereinafter, the method for manufacturing a grindstone and cutter tool of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of the manufacturing method of the present invention in the order of steps. In the figure, reference numeral 1 is an aqueous solution consisting of metal alkoxide, water, chemicals for promoting hydrolysis, etc., reference numeral 2 is abrasive grains, and reference numeral 3 is Stirrer, numeral 4 is a mold, numeral 5 is a mixture of alkoxide and abrasive grains after air drying, numeral 6 is a grindstone after sintering, numeral 7
is a heat treatment furnace.

In manufacturing the whetstone 6, an aqueous solution containing a metal alkoxide, water, and a chemical for promoting hydrolysis is mixed with an abrasive grain (1).
After stirring with a stirrer 3 to form a mixed liquid 8 (Fig. 1 (a), (b)), it is poured into a mold 4 and allowed to air dry (Fig. 1 (C), (d)). ).

The above-mentioned metal alkoxide is hydrolyzed in an aqueous solution to produce a metal oxide that becomes a binding material. Although various metal alkoxides can be used to manufacture the grindstone 6, the metal alkoxides shown in column (■) in Table 1 are preferably used.

These metal alkoxides are hydrolyzed in an aqueous solution,
Ultrafine metal oxide particles (see column ■ in Table 1) are produced.

Table 1 An example of a reaction in which a metal oxide is produced from a metal alkoxide is shown below.

S i (OC2H5)4 +4820→ S!
(Of-1) 4 +4C2H50TolSi
(OH)4→SiO2+2HzO Al produced in this reaction: ] -ru(C21-1s 0f
-1) and water (1120) are removed by evaporation during drying.

The above-mentioned abrasive grains (hard bodies) 2 have a grinding and cutting action, and various materials such as artificial abrasives made of alumina, silicon carbide, or boron nitride, and diamond abrasives can be used as the abrasive grains 2. Can be used.

The viscosity of the liquid mixture 8 made up of the aqueous solution 1 made of metal alkoxide and the abrasive grains 2 is appropriately adjusted by the proportion of water added.

The liquid mixture 8 poured into the mold 4 is dried to remove water, alcohol, etc., and then released from the mold 4 as a mixture 5. The released mixture 4 is then sintered in a heat treatment furnace 7. The heat treatment temperature varies depending on the components of the alkoxide, but is usually about 800°C to 1300°C.

The porosity of the produced grindstone 6 is controlled by the temperature, treatment time, treatment pressure, and viscosity of the mixed liquid 8 during this heat treatment. The higher the heat treatment temperature is, the longer the treatment time is, the more the viscosity of the mixed liquid 8 increases. The higher the porosity (less exposure to water), the lower the porosity of the resulting grindstone 6.

"Function" In this method of manufacturing grindstones and cutting tools,
Ultrafine particles of metal oxide produced by hydrolysis of metal alkoxide serve as the binder. Since this binding material hardens densely on its own, there is no need to apply pressure during firing.

The present inventor believes that the reason is as follows.

"Since the metal compound that serves as the binder is ultrafine particles, the binder particles are packed in a dense state in which they are in close contact with each other.
Since the binder particles are ultra-fine particles, they are highly active and aggregate and become densely solidified only by heat treatment without applying pressure. ” Also, the present invention! ! In the manufacturing method, since the metal oxide that serves as the binder is ultrafine, the grinding wheel 6 can be ground at a lower firing temperature than the binder produced by the conventional pulverization method.

Furthermore, in the manufacturing method of the present invention, by naturally drying the liquid mixture 8 poured into the mold 4, a suitably solidified mixture 5 can be formed, so that the mixture 5 can be removed from the mold and baked. can. Therefore, in the manufacturing method of the present invention, production can be performed using a small-sized heating furnace 7.

"Other Embodiments" Figure 2 shows '!' of the present invention. This shows a second embodiment of the II manufacturing method, and the same components as in the above embodiment are given the same reference numerals to simplify the explanation.

In the manufacturing method of this second embodiment, the mixed liquid 8 (FIG. 2 (a>(b)) adjusted to an appropriate viscosity is flowed down onto the base material 9, and as shown in FIG. 2 (C), It is applied to the surface in a film form, and after drying on the base 4A9 (Fig. 2(d)).
sintered (Fig. 2(e)), and an abrasive layer (hard layer) is formed on the base material 9.
A grindstone 6 in which 10 are laminated is manufactured. The base material 9 used in this manufacturing method is made of a refractory material, and specifically, it is made of a material that is heat resistant and does not deform at the processing temperature of the sintering process (for example, aluminum oxide (AI20x), etc.). It is what was done.

In the manufacturing method of this second embodiment, in addition to obtaining the same effects as in the above embodiment, the abrasive grain layer (hard layer) 10 can be formed into a film shape, so that a thin rigid body or the like can be used as the base material 9. By doing so, it is also possible to manufacture cutting tools (cutters) and the like.

Next, a third embodiment of the manufacturing method of the present invention will be described.

In the first embodiment described above, an example was shown in which the abrasive grains (hardened material) 2 were ground in advance, but as the abrasive grains 2, a metal oxide obtained by hydrolyzing a metal alkoxide was used. You can also do that.

In this case, first, a metal alkoxide that will become the abrasive grains 2 and a metal alkoxide that will become a binder are mixed, and this mixture is added to water together with a hydrolysis accelerator and the like. Then,
Each metal alkoxide becomes fine particles of metal oxide through a hydrolysis reaction, abrasive grains 2 and a binder are formed, and a mixed liquid 8 is obtained.

By treating this liquid mixture 8 in the same manner as in the above embodiment, a grindstone or a cutter tool can be manufactured.

The metal alkoxide used to produce the abrasive grains (hard body) 2 produces an oxide that is harder than the binder, and includes, for example, those shown in column (■) in Table 2. Further, from these metal alkoxides, metal oxides shown in column 2 in Table 2 are produced as abrasive grains 2.

Table 2 The particle size of the abrasive grains 2 thus produced can be controlled by adjusting the temperature and humidity treatment time of the drying process.

The manufacturing method of this third embodiment not only provides the same effects as those of the above embodiments, but also produces fine abrasive grains 2. In addition, the grain size of the abrasive grains 2 is uniform, and the abrasive grains 2 can be packed in a high density, making it possible to use high-quality whetstones and cutting tools for final polishing.

Zarani, this! ! According to the q manufacturing method, the generated binder J5 and abrasive grains (hard body) 2 are immediately mixed in the form of particles, so when conventionally pulverized binder material and hard body are mixed using a ball mill. There is no possibility of particles clumping together as in the case of Therefore, the obtained grindstone or cutter tool has high quality in which the abrasive grains (hard body) 2 are uniformly dispersed. In particular, a dramatic improvement is seen when the particle size of the abrasive grains 2 is small.

As a result of solving the problem of dispersibility of abrasive grains 2, this manufacturing method allows the grain size of the hard body to be further reduced, resulting in an effective final finish that allows high-precision machining with fewer crystal defects and distortion. It is possible to make one grindstone etc. that exhibits the following.

"Effects of the Invention" As explained above, the method for manufacturing a grindstone and a cutter tool of the present invention uses ultrafine particles produced by the hydrolysis reaction of metal alkoxide as binder particles. It is easy to mold and does not require pressure. Therefore, in the manufacturing method of the present invention, production can be carried out using a small sintering furnace, and a large press machine is not required, so that large grindstones and cutlery tools can be easily produced.

Furthermore, in the manufacturing method of the present invention, the diameter of the binder particles can be reduced to 0.01 μm or less, so the sintering temperature when manufacturing the grindstone can be significantly lowered.

As described above, in the manufacturing method of the present invention, the binder/hard body can be molded without pressure and at a low sintering temperature. ! 2) If you have a mold, you can easily manufacture oddly shaped knives, whetstones, etc. by simply pouring the mold and letting it dry.

[Brief explanation of drawings]

FIG. 1 shows the first method of manufacturing a grindstone and cutter tool of the present invention.
FIG. 2 is a process diagram showing the first embodiment, and FIG. 2 is a process diagram showing the second embodiment. 1...Aqueous solution, 2...Abrasive grains, 3...
... Stirrer, 4... Molding mold, 6...
- Grinding stone, 7... Heat treatment furnace, 8... Mixed liquid, 9... Base material, 10... Abrasive grain layer (hard layer). Applicant Nippon Telegraph and Telephone Corporation Agent Patent Attorney Masaru Shiga 1 ('-,. (f)

Claims (2)

[Claims] (1) The aqueous solution to which metal alkoxide has been added and the hard body are mixed, this mixture is injected into a mold or applied to a base material made of refractory material, and then they are dried and then sintered. A method for manufacturing a grindstone and cutter tool. (2) The method for manufacturing a grindstone and cutter tool according to claim 1, wherein the hard body is a metal oxide particle obtained by hydrolyzing a metal alkoxide.