KR20050121319A - Method for fabricating diamond green tape using tape casting process and diamond green tape thereof - Google Patents

Abstract

The present invention is a diamond green tape manufacturing method and diamond green for producing a diamond green tape that can be easily formed and deformed to cope with diamond cutting tools that require various shapes using a tape casting method suitable for continuous processing and mass production. A tape, comprising: mixing a liquid organic compound with a sinterable powder and a diamond powder to prepare a fluid slurry; It provides a method for producing a diamond green tape using a tape casting method comprising the step of tape casting the prepared slurry into a green tape, and also by mixing a liquid organic compound in a sinterable powder fluidity Preparing a slurry; The method of manufacturing a diamond green tape using a tape casting method and a diamond green manufactured therefrom comprising the step of tape casting the prepared slurry and simultaneously spraying diamond powder on the upper surface thereof to produce a green tape. Provide a tape.

Description

Manufacture method of diamond green tape and tape green tape using tape casting method TECHNICAL FIELD [Method for FABRICATING DIAMOND GREEN TAPE USING TAPE CASTING PROCESS AND DIAMOND GREEN TAPE THEREOF}

The present invention relates to a method for producing a diamond green tape and a diamond green tape using a tape casting method, and more particularly, to continuously form a diamond green tape that can be easily formed and deformed to cope with diamond cutting tools requiring various shapes. The present invention relates to a method for producing a diamond green tape and a diamond green tape produced using a tape casting method suitable for process and mass production.

In general, the conventional process for manufacturing various types of diamond cutting tools such as Metal Brazing Single Layer (MBSL), Rotary Dresser (R / D), Wire Saw, and Chemical-Mechanical Polishing (CMP) equipment is known as diamond. After applying a paste for attaching the diamond powder to a place that needs to form the (Paste), the diamond powder is sprayed on the site and heat treatment at a suitable temperature has been taken to sinter.

The conventional technique for manufacturing a diamond cutting tool has the following problems.

First, the paste is applied to the area where the diamond needs to be formed, and then the diamond powder is sprayed by hand, so the amount of diamond sprayed is not quantitatively controlled, and it is strongly dependent on the operator's experience to produce high quality diamond cutting tools. There is a problem that can not be,

Second, because the worker sprays the diamond powder by hand, the amount of diamonds to be sprayed is not quantitatively controlled, and the diamonds are irregularly arranged so that the powders cannot be aligned and the complicated shape of the diamond cutting tool including the bends. There is a problem that is not applicable.

Third, there is a problem that the production cost increases due to the increase in the number of processes, excessive manufacturing process time because all processes depend on manual work,

Fourthly, since the diamond powder is sprayed by hand by the operator based on experience, it is difficult to produce a diamond cutting tool having uniform characteristics, that is, reproducibility, and is not suitable for mass production.

In order to solve the above problems of the prior art, the present invention is to produce a diamond green tape having a uniform diamond distribution characteristics and easy to form and deformation to cope with diamond cutting tools that require a variety of forms by a tape casting process It is an object of the present invention to provide a diamond green tape manufacturing method and a diamond green tape using a tape casting method that can be applied to a diamond cutting tool to secure reproducibility and to improve mass production.

In order to achieve the above object, the present invention comprises the steps of preparing a fluid slurry by mixing a liquid organic compound to the sinterable powder and diamond powder; It provides a method for producing a diamond green tape using a tape casting method comprising the step of producing a green tape by tape casting the prepared slurry.

In addition, the present invention comprises the steps of preparing a fluid slurry by mixing a liquid organic compound to the sinterable powder; It provides a method for producing a diamond green tape using a tape casting method comprising the step of manufacturing the green tape by spraying the diamond powder on the upper surface of the slurry while the tape is produced.

In addition, the present invention is to prepare a slurry by mixing a solvent and a dispersant as an organic compound to a solid powder in the step of preparing the slurry, and then to the secondary slurry by adding a crosslinking agent and a plasticizer as an organic compound to the secondary slurry It provides a method for producing a diamond green tape using a tape casting method for producing a.

In addition, the present invention provides a method for producing a diamond green tape using a tape casting method of selectively adding and mixing a mold release agent or an adhesive which is an organic compound in the step of preparing the primary slurry.

In addition, the present invention provides a method for producing a diamond green tape using a tape casting method in which the sinterable powder in the step of preparing the primary slurry is one or a mixture of two or more selected from metal and ceramic powder.

In addition, the present invention provides a method for producing a diamond green tape using a tape casting method of tape casting while stirring the slurry so that powder particles of the slurry are not precipitated in the step of manufacturing the green tape.

In addition, the present invention is a 70 to 90% by weight of the solid powder in the step of preparing the primary slurry, 60 to 90% by weight of the primary slurry in the preparation of the secondary slurry using a tape casting method It provides a method for producing a diamond green tape.

On the other hand, the present invention provides a diamond green tape in the form of a natural dispersion of irregular diamond particles on the green tape by tape casting a fluid slurry prepared by mixing a liquid organic compound in the sinterable powder and diamond powder.

In addition, the present invention is characterized in that the diamond particles are arranged on the green tape by ordering the flow of the slurry produced by mixing the liquid organic compound with the sinterable powder and spraying the diamond powder on the upper surface thereof. Diamond green tape to be provided.

Hereinafter, a typical tape casting process and apparatus applied to the present invention will be described.

In the tape casting process applied to the present invention, a ceramic powder or a metal (alloy) powder is mixed with a liquid solvent such as alcohol or water to make a slurry, and the slurry is made of stainless steel. After spreading thinly on a carrier tape made of oil paper and a polymer, the solvent is dried and separated from the carrier tape to obtain a tape-shaped molded product.

A general tape casting apparatus for performing the tape casting process may include a slurry chamber 1, a doctor blade 2, a carrier tape 3, like the general tape casting equipment illustrated in FIG. 1. ), Drying Chamber (4), etc.Casting Speed, Temperature Profile, Solvent Gradient, Air Flow Rate, Molded Green The tape thickness and the like are precisely recorded and controlled.

In particular, the height of the doctor blade 2 directly affecting the thickness of the green tape 5 to be tape cast should be precisely controlled and fixed, and the carrier tape 3 indirectly affecting the thickness of the green tape 5. The speed of travel should be kept constant.

The air blown into the drying chamber 4 in the reverse direction of the green tape 5 to be manufactured is usually preheated to accelerate drying, and dust is completely removed by using a filter for a cleaner drying environment. It is also possible to introduce the used air. In order to speed up the drying process, a heater may be installed in the drying chamber. The most important thing in this drying process is that the drying is constant so that the crack does not occur in the green tape 5.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention.

2 is a process diagram showing a first embodiment of a method of manufacturing a diamond green tape using the tape casting method according to the present invention, Figure 3 is a second of a method of manufacturing a diamond green tape using the tape casting method according to the present invention Figure 4 is a process diagram showing an embodiment, Figure 4 is a schematic diagram showing a tape casting equipment for a method of manufacturing a diamond green tape using a tape casting method according to the present invention.

The present invention has been applied to the specific embodiments as shown in each of the above drawings, the present invention is not limited to these specific embodiments, and various modifications can be made without departing from the spirit of the present invention.

When explaining the basic concept of the present invention.

As shown in Figure 2 and 3, the tape casting (Tape Casting) applied to the present invention is a process for producing a metal powder or ceramic powder in the form of a thick film, slurrying the metal powder and ceramic powder (Slurry) The process to do is included.

The slurrying process constituting the present invention is divided into a primary slurry production step and a secondary slurry production step. That is, a primary slurry is prepared by mixing together a metal (alloy) or ceramic powder or a solvent for imparting fluidity to a mixed powder mixed with diamond powder and a dispersant to uniformly distribute each powder in the slurry. Done.

Then, a crosslinking agent is added to the prepared primary slurry to maintain the molding shape until the sintering process, and then mixed by adding a plasticizer which is added to give the fluidity to facilitate casting or to give the molded article flexibility. The secondary slurry is prepared by adding a release agent to easily detach from the carrier tape and an adhesive to increase adhesion to the object to be adhered to the secondary slurry. The pressure-sensitive adhesive and the release agent do not need to be added when already applied on the carrier tape.

The final secondary slurry prepared as described above is manufactured with a green tape using a tape casting process, and the green tape is formed on the carrier tape by controlling the feeding speed of the doctor blade and the carrier tape by controlling the thickness of the doctor blade and the carrier tape. Done. Here, the green tape manufactured by tape casting the slurry in which the diamond powder is not mixed is sprayed with diamond powder using an injector of diamond powder installed on the tape casting device to manufacture the green tape.

The method of manufacturing the green tape using the tape casting process is easy to manufacture to give plasticity to the green tape so that it is easy to store and move. Especially, it has the advantage of continuous process and mass production, and it can be spared until the green tape is dried. The presence of time has the temporal advantage of dispersing or aligning the diamond prior to drying of the tape. In addition, since it is easy to mold and deform to a desired shape after drying the green tape, it can be very advantageous to cope with the shape of the diamond saw that various shapes are required.

Hereinafter, with reference to specific embodiments of the present invention will be described in more detail.

In the first embodiment of the present invention, as shown in Figure 2, to prepare a primary slurry to include a diamond powder, the powder used may be any powder of the sinterable material. That is, metal or alloy powder, ceramic powder may be applied alone, and may be applied to the mixed powder (metal and metal, metal and ceramic, ceramic and ceramic). What is important here is the amount of diamond powder to be included, which is appropriately selected and mixed to correspond to the diamond cutting tool to which the final green tape is applied.

In addition, in the first slurry manufacturing step, the important compound is an organic compound added as a solvent and a dispersant to be added. Solvent is one selected from toluene, isopropanol, methyl ethyl ketone, ethanol, methyl isobutyl ketone, ethyl acetate, and cyclohexane. Alternatively, two or more mixtures may be used, and as the dispersant, one or two or more mixtures selected from BYK111, BYK180, fish oil, polyoxyethylene sorbitan trioleate, and polyethylene glycol may be used.

In the first slurry production step, a crosslinking agent may be added to the solid powder to serve to maintain the initial molding shape until the sintering process. As such a crosslinking material (Vulcanizing Agent), one or a mixture of two or more selected from polyvinyl butyral, ethyl cellulose and cellulose acetate is used.

The components of the above-described types of organic solvents have the same name, but there are many kinds according to their molecular weights, and the organic solvents of similar but limited components can be added in various ways because they are limited to obtain desired properties.

In addition, the solid phase content of the primary slurry is composed so as to be in the range of 70 to 90% by weight of the total slurry weight, which has a high powder content as much as possible because it has a great influence on controlling the viscosity in the secondary slurry manufacturing step, which is a post-process. To control it.

As described above, the primary slurry is prepared, and a plasticizer is added and mixed thereto to prepare a secondary slurry.

The plasticizer is added to give a fluidity to the primary slurry to facilitate casting or to give flexibility to the molded article, and one or more dibutylphthalate, dioptylphthalate, polyethylene glycol, and the like are mixed and used.

In the secondary slurry manufacturing step, a release agent and an adhesive may be mixed. In other words, any mold release agent that can be easily detached from the carrier tape can be applied to any silicone-based release agent, and SR336, AF510, GM920, etc. may be used as an adhesive to increase adhesion to the object to be bonded.

In addition, when preparing the secondary slurry, it is preferable that the primary slurry contains 60 to 90% by weight or more of the total weight of the secondary slurry, which has a viscosity suitable for the tape casting process In order to have the maximum powder content. Here, the viscosity of the final slurry to be prepared is 600 ~ 4000cP (centi-Poise) to facilitate the tape casting process.

When the secondary slurry is manufactured under the above conditions, the tape casting is performed using the conventional tape casting apparatus shown in FIG. 1. The secondary slurry is continuously supplied to the slurry chamber 1 of the tape casting apparatus. At this time, it should be noted that the specific gravity of the diamond powder contained in the secondary slurry is relatively heavy so that the slurry can be prevented from being precipitated. It is important to install a separate stirring means inside the chamber 1 so that it is always stirred.

In addition, the secondary slurry discharged from the slurry chamber 1 and cast on the carrier tape 3 has its casting thickness determined by the height of the doctor blade 2 installed in the discharge portion of the chamber 1. By maintaining the green tape (5) is formed to a uniform casting thickness. The casting thickness of the green tape (5) is formed here can be variously formed according to the diamond cutting tool to which the green tape (5) is applied, is usually cast in a thickness of 0.12 ~ 0.5mm range.

At this time, the casting speed (casting speed) is determined by the conveying speed of the carrier tape (3), so that the range of about 1800 ~ 5000㎜ / min, and if any casting speed is determined, the speed is kept constant and uniform quality It is preferable to make the green tape of the production.

The green tape 5 manufactured under the above conditions is dried while passing through the drying chamber 4 provided above the transfer line of the tape casting apparatus, and selects natural drying or heating drying depending on the solvent used. That is, in the case of natural drying, the air is blown at room temperature and dried, and the heating and drying is performed by heating the air using a heater installed in the drying chamber 4 and then blowing and drying the air. At this time, it is also possible to blow out the air completely removed dust using a filter (Filter) for a cleaner drying environment. The most important thing in this drying process is that the drying is constant so that the crack does not occur in the green tape 5.

Meanwhile, as shown in FIG. 3, in the second embodiment of the present invention, the diamond powder is not mixed to be included in the primary slurry as a starting material, but is cast with green tape and then sprinkled with diamond powder on the upper surface thereof. To give.

That is, as in the first embodiment described above, as sinterable powders, metal, alloy powder, and ceramic powder may be applied alone, and mixed powders (metal and metal, metal and ceramic, ceramic and ceramic) may be applied to the powder. Can be.

The primary slurry production step in the second embodiment of the present invention is applied in the same manner as the first embodiment of the present invention described in detail above except for the diamond powder mixed as starting materials.

In the second embodiment of the present invention, the solid phase content of the primary slurry is formed to be 70 to 90% by weight or more of the total sludge-based sludge, which is possible because it has a great influence on controlling the viscosity in the secondary slurry manufacturing step, which is a post-process. The content of one powder is controlled to be high, and when the preparation of the first slurry is completed, a second slurry is prepared by mixing a plasticizer, a release agent, and an adhesive. Herein, the plasticizer, the releasing agent and the adhesive are applied in the same manner as in the first embodiment of the present invention.

Also in the second embodiment of the present invention, when preparing the secondary slurry, it is preferable that the primary slurry to contain at least 60 to 90% by weight of the total intake of the secondary sludge, which is tape casting of the viscosity of the final slurry This is to have a maximum powder content while having a viscosity suitable for the process. The viscosity of the final slurry to be prepared here is to be 600 ~ 4000cP (centi-Poise) to facilitate the tape casting process.

When the secondary slurry is manufactured under the above conditions, tape casting is performed by using the tape casting apparatus shown in FIG. 4, and the secondary slurry continuously supplied to the slurry chamber 1 of the tape casting apparatus is supplied. In addition, a separate stirring means is installed inside the slurry chamber 1 so as to prevent precipitation of a high specific gravity powder contained in the secondary slurry to be stirred at all times.

In addition, in the second embodiment of the present invention, the secondary slurry discharged from the slurry chamber 1 and cast on the carrier tape 3 is cast by the height of the doctor blade 2 installed in the discharge chamber 1. The thickness is determined and always maintains a constant height so that the green tape 5 is formed with a uniform casting thickness.

As described above, the casting thickness of the green tape 5 may be variously formed according to the diamond cutting tool to which the green tape 5 is applied, and is usually cast in a thickness of 0.12 to 0.5 mm.

The casting speed is also determined by the conveying speed of the carrier tape 3 as in the first embodiment. The casting speed is in the range of about 1800 to 5000 mm / min. It is desirable to keep it constant so that a green tape of uniform quality is produced.

According to the second embodiment of the present invention, when the green tape 5 is cast and moved in the transfer line under the above conditions, diamond powder is sprinkled on the upper portion thereof. That is, as shown in FIG. 4, the diamond injector 10 is installed at a predetermined distance from the discharge portion of the slurry chamber 1, and the diamond powder is fixed on the upper surface of the green tape 5 which has not yet been dried. It is supplied at a speed and attached. Here, the selection of the discharge rate of the diamond powder sprayed from the diamond injector 10 to the undried green tape 5 is determined by the diamond cutting tool to which the green tape 5 to be manufactured is applied, and the diamond powder If the discharge rate is high, the diamond powder is more densely arranged.

As described above, the manufactured green tape 5 manufactured so that the diamond powder is located on the upper surface is dried while passing through the drying chamber 4 provided above the transfer line of the tape casting device, and naturally dried or heated depending on the solvent used. Select drying. That is, in the case of natural drying, the air is blown at room temperature and dried, and the heating and drying is performed by heating the air using a heater installed in the drying chamber 4 and then blowing and drying the air. At this time, it is also possible to blow in the air completely removed dust using a filter (Filter) for a cleaner drying environment. The most important thing in this drying process is that the drying is constant so that the crack does not occur in the green tape 5.

5 is a plan view illustrating a diamond green tape manufactured according to a method of manufacturing a diamond green tape using a tape casting method according to the present invention, and FIG. 6 illustrates various diamond cutting tools using the diamond green tape manufactured according to the present invention. It is a schematic diagram shown.

As shown in FIG. 5, the diamond green tape manufacturing method using the tape casting method according to the present invention may arrange diamond particles on a ceramic tape of a ceramic or metal material.

A plan view of the green tape shown in (a) and (b) of FIG. 5 shows a green tape of the present invention manufactured according to the first embodiment. That is, when the diamond powder 11 is mixed with the raw material to prepare the first and second slurry and the tape is cast, the diamond powder 11 is distributed in an irregular natural dispersion type on the green tape.

In addition, since the distribution density of the diamond powder 11 is determined by the amount and casting speed of the diamond powder 11 included in the ceramic or metal powder as a starting material, it is shown in (b) rather than (a) of FIG. Since the distribution density of the green tape 5 is high, it means that the amount of diamond powder 11 contained in the starting material is relatively higher or the casting speed is slower.

On the other hand, the top view of the green tape shown in (c) and (d) of Figure 5 shows a green tape of the present invention manufactured according to the second embodiment. In other words, the primary and secondary slurry is manufactured from ceramic or metal powder, which is the raw material, and the tape is cast. At the same time, the diamond particles 11 are placed on the upper surface thereof using a diamond spraying device. In this case, the diamond powder 11 is in an ordered form regularly distributed on the final green tape 5.

Further, the distribution density of the diamond particles 11 located on the green tape 5 depends on the casting speed and the diamond injection speed of the green tape 5 to be manufactured. That is, since the distribution density of the diamond particles 11 located on the green tape 5 shown in (d) is higher than that of FIG. 5 (c), the casting speed of the green tape 5 is relatively slow or diamond This means that the injection speed of the particles 11 is large.

As described above, the green tape 5 having the distribution form and the distribution density of the various diamond particles 11 manufactured, respectively, may be applied to various types of diamond cutting tools.

That is, as shown in (a) of FIG. 6, the diamond-containing green tape 5 of the present invention is attached to the shank 20 of the wire saw so that the diamond particles 11 are sintered. As shown in FIG. 6B, the diamond-containing green tape 5 of the present invention is also attached to the MBSL (Metal Brazing Single Layer) portion of the diamond cutting wheel shank 22 to sinter the process. The diamond particles 11 are formed therethrough. In addition, as shown in FIG. 6C, the diamond-containing green tape 5 of the present invention is also attached to the disk 23 of the chemical mechanical polisher (CMP), which is a polishing apparatus, and undergoes a sintering process. ) Is formed.

The method of attaching the diamond green tape according to the present invention has an advantage of placing the diamond particles up to a bent portion or a narrow space portion, as compared to the conventional method of spraying the diamond particles after applying paste, and the diamond green tape according to the present invention. Is applicable to all means and equipment that require the formation of diamond particles, as well as the diamond cutting means shown in FIG.

As described above, the present invention has the effect of manufacturing a variety of diamond tools are formed complex and bent or narrow by applying a green tape containing a diamond using a tape casting process to a variety of diamond cutting means. In addition, the use of uniform and reproducible diamond green tape enables the production of high quality diamond tools in large quantities, and the economical effect of reducing the production cost and securing price competitiveness by shortening the number of processes for producing such diamond tools. There is.

1 is a perspective view of a typical tapecasting equipment;

Figure 2 is a process diagram showing a first embodiment of a method for producing a diamond green tape using a tape casting method according to the present invention;

3 is a process chart showing a second embodiment of the method for producing a diamond green tape using the tape casting method according to the present invention;

Figure 4 is a schematic diagram showing a tape casting equipment for a method of manufacturing a diamond green tape using a tape casting method according to the present invention;

5 is a plan view showing a diamond green tape manufactured according to the method for producing a diamond green tape using the tape casting method according to the present invention;

Figure 6 is a schematic diagram showing a variety of cutting means using the diamond green tape manufactured according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

1: slurry chamber 2: doctor blade

3: carrier tape 4: drying chamber

5: green tape 6: slurry

10: diamond injector 11: diamond particles (powder)

Claims (10)

In the method for producing a green tape containing diamond particles, Mixing a sinterable powder and a diamond powder with a liquid organic compound to prepare a fluid slurry; Tape casting the slurry produced by the manufacturing method of the diamond green tape using a tape casting method comprising the step of producing a green tape. In the method for producing a green tape containing diamond particles, Mixing a liquid organic compound with a sinterable powder to prepare a fluid slurry; The method of manufacturing a diamond green tape using a tape casting method comprising the step of manufacturing a green tape by spraying diamond powder on the top surface of the slurry while simultaneously casting the slurry. The method of claim 1 or 2, wherein the step of preparing the slurry comprises the steps of preparing a primary slurry by mixing a solvent and a dispersant as an organic compound to a solid powder; The method of manufacturing a diamond green tape using a tape casting method comprising the step of preparing a secondary slurry by adding a crosslinking agent and a plasticizer, which are organic compounds, to the prepared primary slurry. The method of claim 3, wherein the preparing of the secondary slurry is a method of manufacturing a diamond green tape using a tape casting method, characterized in that additionally adding and releasing a release agent or an adhesive which is an organic compound. The method of claim 1 or 2, wherein the sinterable powder in the step of preparing the primary slurry is one selected from metal and ceramic powder, or a mixture of two or more, characterized in that the diamond green tape manufacturing method using a tape casting method. The method of claim 1 or 2, wherein the manufacturing of the green tape comprises producing a diamond green tape using a tape casting method, wherein the slurry is tape-cast while stirring the powder particles of the slurry so as not to precipitate. The method of claim 1 or 2, wherein the preparing of the primary slurry is a diamond green tape manufacturing method using a tape casting method, characterized in that the powder of the solid phase is 70 to 90% by weight. The method of claim 1 or 2, wherein the preparing of the secondary slurry is a diamond green tape manufacturing method using a tape casting method, characterized in that the primary slurry is 60 to 90% by weight. Diamond green tape is produced by the manufacturing method of claim 1 characterized in that the diamond particles are irregularly dispersed in the green tape. Diamond green tape is manufactured by the manufacturing method of claim 2 characterized in that the regular arrangement of diamond particles aligned on the green tape.