WO2009064093A1 - Diamond tools and manufacturing method of the same - Google Patents

Diamond tools and manufacturing method of the same Download PDF

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Publication number
WO2009064093A1
WO2009064093A1 PCT/KR2008/006617 KR2008006617W WO2009064093A1 WO 2009064093 A1 WO2009064093 A1 WO 2009064093A1 KR 2008006617 W KR2008006617 W KR 2008006617W WO 2009064093 A1 WO2009064093 A1 WO 2009064093A1
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WO
WIPO (PCT)
Prior art keywords
segment
diamond
coupled
shank
granules
Prior art date
Application number
PCT/KR2008/006617
Other languages
French (fr)
Inventor
Sung-Ho Cho
Moon Soo Kim
Seok Ku Kim
Kyu Bok Lee
Original Assignee
Shinhan Diamond Ind. Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shinhan Diamond Ind. Co., Ltd. filed Critical Shinhan Diamond Ind. Co., Ltd.
Publication of WO2009064093A1 publication Critical patent/WO2009064093A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels
    • B24D5/123—Cut-off wheels having different cutting segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental

Definitions

  • the present invention relates to a diamond tool for cutting or grinding a workpiece and a method of manufacturing the same, and more particularly, to a diamond tool, which is manufactured by repeatedly performing sintering and fusion-bonding processes for diamond granules to increase a cutting force and a service life time thereof, and method for manufacturing the same.
  • a diamond tool is a tool for cutting or grinding a surface of a workpiece and comprises a shank, which is coupled to an grinding device and has a wheel or plate shape suitable for machining an inner diameter, an inner surface, an intrados or an extrados of the workpiece, and a segment coupled to an outer circumference surface of the shank to substantially cut the workpiece.
  • a wire saw type diamond tool combined to a wire has been employed.
  • FIG. 1 (a) and (b) are perspective views of a hole cutter-type diamond tool and a wire saw type diamond tool according to a conventional art
  • Fig. 2 (a) and (b) are sectional views of diamond tools shown in Fig. 1.
  • a diamond tool 10 used for performing a boring process for a workpiece has a cylindrical shank 20, and a segment(s) 30 having diamond granules 32 is coupled to the shank 20.
  • the segment 30 is an element, in which the diamond granules 32 are sintered to a binder 34, wherein the diamond granules 32 comprise abrasive particles including natural diamond or artificial diamond, cubic boron nitride (c-BN) or alumina (Al O ), or silicon carbide (SiC) or titanium carbide (TiC).
  • abrasive particles including natural diamond or artificial diamond, cubic boron nitride (c-BN) or alumina (Al O ), or silicon carbide (SiC) or titanium carbide (TiC).
  • the diamond tool 10 is rubbed against a surface of a workpiece to bore a hole therethrough.
  • the segment 30 performs substantially a cutting process.
  • An object of the present invention is to provide a diamond tool, in which diamond granules are coupled by a sintering process and diamond granules are then fusion- bonded onto the sintered diamond granules to enhance cutting performance and a service life time thereof and to prevent a biased abrasion thereof from being generated during a cutting process, and a method for manufacturing the same.
  • a diamond tool according to the present invention for achieving the object which is coupled to a machining device to cut or grind a workpiece, comprises a shank coupled to the machining device; and a segment coupled to the shank and having diamond granules, wherein the segment comprises a first segment formed by sintering diamond granules and a binder, and a second segment formed by fusion-bonding diamond granules.
  • first and second segments be alternately coupled.
  • the first and second segments may be vertically coupled or horizontally laminated and coupled to a surface of the shank.
  • the second segment may be fusion-bonded to at least a portion of a surface of the first segment.
  • a method of manufacturing a diamond tool according to the present invention for achieving the object comprises the steps of providing a shank to be coupled to a machining device; mixing diamond granules and a binder, and then sintering the mixture to form a first segment; fusion-bonding diamond granules to form a second segment; and alternately coupling the first and second segments and coupling them to the shank.
  • the second segment may be fusion-bonded to the first segment. Further, the second segment may be fusion-bonded to a surface of an auxiliary shank corresponding to the first segment in size.
  • a method of manufacturing a diamond tool according to a further embodiment of the present invention for achieving the object comprises the steps providing a shank to be coupled to a machining device; mixing diamond granules and a binder and then sintering the mixture to form a first segment; fusion-bonding diamond granules on at least a portion of the first segment to form a second segment; and coupling the first segment having the second segment formed thereon to the shank.
  • FIG. 1 (a) and (b) are perspective views of a hole cutter- type diamond tool and a wire saw-type diamond tool according to a conventional art
  • FIG. 2 (a) and (b) are sectional views of the diamond tools shown in Fig. 1;
  • FIG. 3 (a) and (b) are perspective views of a hole cutter- type diamond tool and a wire saw-type diamond tool according to an embodiment of the present invention
  • Fig. 4 (a) and (b) are sectional views of the diamond tools shown in Fig. 3;
  • FIG. 5 is a sectional view of a diamond tool according to another embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method of manufacturing a diamond tool according to one embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a method of manufacturing a diamond tool according to another embodiment of the present invention. Best Mode for Carrying out the Invention
  • FIG. 3 (a) and (b) are perspective views of a hole cutter-type diamond tool and a wire saw-type diamond tool according to an embodiment of the present invention
  • Fig. 4 (a) and (b) are sectional views of the diamond tools shown in Fig. 3.
  • a diamond tool 110 is used for cutting or grinding a workpiece and comprises a shank 120 to be coupled to a machining device and a segment(s) 130 coupled to the shank 120, wherein diamond granules 132, 136 are fixedly maintained on the segment 130.
  • the segment 130 comprises first segments 131 formed by sintering the diamonds granules 132 and binders 134 for fixedly maintaining the diamond granules 132 and second segments 135 formed by fusion-bonding a diamond granules 136.
  • the diamonds granules 132 are uniformly distributed in the binder 134 comprising metal powders, ceramic, high molecular compound or the like, and they are sintered at a high temperature to thereby form the first segment 131.
  • the second segment 135 is formed by fusion-bonding the diamond granules 136, and may further comprise an auxiliary shank to which the diamond granules 136 are attached.
  • the auxiliary shank is coated with a filler 138 which is a mixture of metal and a binder, the diamond granules 136 are dispersed in the filler 138, and the filler and the diamond granules are then fusion-bonded at high temperature, thereby forming the second segment.
  • nickel filler is mainly used as the filler 138, and a method using nonmetallic heating body and a method using a high frequency induction coil may be mainly employed as the method of fusion-bonding the filler and the diamond granules.
  • first and second segments 131 and 135 formed as described above are alternately coupled to each other.
  • the first and second segments 131 and 135 may be coupled vertically to the shank, or laminated horizontally and then coupled to the shank.
  • the first and second segments 131 and 135 are coupled vertically or horizontally in a combined manner, or coupled alternately.
  • the diamond tool may be configured such that the second segments 135 are positioned on a surface facing a direction in which a workpiece is cut and thus cut or grind the workpiece initially.
  • first and second segments 131 and 135 may be coupled to the shank
  • the second segment 135 of the diamond tool 110 of the present invention cuts first the workpiece.
  • the second segment 135 since the diamond granules 135 are coupled by fusion-bonding, the second segment 135 has the excellent coupling and cutting force.
  • the diamond granules 136 are separated from the second segment 135, the diamond granules 132 of the first segment 131 are exposed and then grind or cut the workpiece.
  • the first and second segments 131 and 135 are configured to have a layered structure, the separation of the diamond granules 132, 136 cause abrasion of a layered type of the diamond tool 110 not to be generated.
  • the diamond tool 210 comprises a shank 220 to be coupled to a machining device and a segment 230 coupled to the shank 210 and performing a substantial cutting or grinding process.
  • the segment 230 comprises a first segment 231 formed by sintering diamond granules 232 and a binder 234 and a second segment 235 formed by fusion-bonding the diamond granules 236 on a filler 238.
  • the second segment 235 may be fusion-bonded to a portion of a surface of the first segment 231. At this time, it is more preferable that the second segment 235 is formed on a surface facing a direction in which the diamond tool 210 moves forward, i.e., a surface facing a direction in which a workpiece is cut.
  • the second segment 235 cuts or grinds first the workpiece.
  • the diamond granules 236 are separated from the second segment 235, the diamond granules 232 of the first segment 231 are exposed and then perform the process of cutting or grinding the workpiece.
  • FIG. 6 is a flowchart illustrating a method of manufacturing a diamond tool according to one embodiment of the present invention. The method of manufacturing the diamond tool is illustrated with reference to the figure as follow.
  • the method of manufacturing the diamond tool 110 comprises the step of providing the shank 120 to be coupled to a machining device (SlOO).
  • the shank 120 may be formed depending on a shape of a workpiece and a machining purpose.
  • the diamond granules 132 and the binder 134 are mixed.
  • the binder 134 may consist of metallic powder, ceramic or high molecular compound.
  • the binder 134 containing the diamond granules 132 is sintered to form the first segment 131.
  • a frame having a predetermined shape is filled with the mixture and the mixture is then sintered to form the first segment 131 with a desired shape.
  • step (S 120) of forming the second segment 135 by fusion-bonding the diamond granules 132 there is the step (S 120) of forming the second segment 135 by fusion-bonding the diamond granules 132.
  • the second segment 135 may be fusion-bonded to and formed on the first segment 131.
  • the second segment 135 may be formed by providing an auxiliary shank corresponding to the first segment 131 in size and fusion-bonding the diamond granules 136 and the filler 138 to a surface of the auxiliary shank.
  • first and second segments 131 and 135 are alternately coupled to the shank 120.
  • first and second segments 131 and 135 may be coupled perpendicularly to the shank 120 or the structure formed by laminating the first and second segments 131 and 135 horizontally may be coupled to the shank.
  • the diamond tool as claimed in the present invention can be manufactured through the above processes (S 140).
  • Fig. 7 is a flowchart illustrating a method of manufacturing a diamond tool according to another embodiment of the present invention. The method of manufacturing the diamond tool is illustrated with reference to the figure as follow.
  • the method of manufacturing the diamond tool 210 comprises the step of providing the shank 220 to be coupled to a machining device (S200).
  • the shank 220 is provided, as the step (S210) of forming the first segment 231, the diamond granules 232 and the binder 234 are mixed.
  • the binder 234 may comprise metallic powder, ceramic or high molecular compound.
  • the binder 234 containing the diamond granules 232 is sintered to thereby form the first segment 231.
  • a frame having a predetermined shape is filled with the mixture and the mixture is then sintered to form the first segment 231 with a desired shape.
  • the diamond granules 236 and the filler 238 are fusion-bonded on a portion of a surface of the first segment 231 or the entire surface thereof, which faces a direction in which the diamond tool 210 moves forward for cutting or grinding a workpiece, thereby forming the second segment 235 (S220).
  • the first segment 231 on which the second segment 235 is formed is coupled to a surface of the shank 220 (S230).
  • the first and second segments 231 and 235 may be coupled to the shank 220 through an adhesive or by a method, such as silver soldering or laser welding.
  • the diamond tool as claimed in the present invention can be manufactured through the above processes (S240).
  • the present is also applicable to a tool such as a core drill, a cutter, a saw blade, a saw, a wire saw, a polishing cup, a profiler and an end mill, as well as a tool such as a straight wheel, an ID wheel, a rotary dresser and an edge grinding wheel.
  • a tool such as a core drill, a cutter, a saw blade, a saw, a wire saw, a polishing cup, a profiler and an end mill, as well as a tool such as a straight wheel, an ID wheel, a rotary dresser and an edge grinding wheel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Manufacturing & Machinery (AREA)

Abstract

The present invention relates to a diamond tool for cutting or grinding a workpiece and a method of manufacturing the same. An object of the present invention is to provide a diamond tool, in which diamond granules are coupled by a sintering process and diamond granules are then fusion-bonded onto the sintered diamond granules to enhance cutting performance and a service life time thereof and to prevent a biased abrasion thereof from being generated during a cutting process, and a method for manufacturing the same. A diamond tool according to the present invention for achieving the object, which is coupled to a machining device to cut or grind a workpiece, comprises a shank coupled to the machining device; and a segment coupled to the shank and having diamond granules, wherein the segment comprises a first segment formed by sintering diamond granules and a binder, and a second segment formed by fusion-bonding diamond granules.

Description

Description
DIAMOND TOOLS AND MANUFACTURING METHOD OF
THE SAME
Technical Field
[1] The present invention relates to a diamond tool for cutting or grinding a workpiece and a method of manufacturing the same, and more particularly, to a diamond tool, which is manufactured by repeatedly performing sintering and fusion-bonding processes for diamond granules to increase a cutting force and a service life time thereof, and method for manufacturing the same. Background Art
[2] In general, a diamond tool is a tool for cutting or grinding a surface of a workpiece and comprises a shank, which is coupled to an grinding device and has a wheel or plate shape suitable for machining an inner diameter, an inner surface, an intrados or an extrados of the workpiece, and a segment coupled to an outer circumference surface of the shank to substantially cut the workpiece. In addition, as a latest diamond tool, a wire saw type diamond tool combined to a wire has been employed.
[3] Fig. 1 (a) and (b) are perspective views of a hole cutter-type diamond tool and a wire saw type diamond tool according to a conventional art, and Fig. 2 (a) and (b) are sectional views of diamond tools shown in Fig. 1. A diamond tool 10 used for performing a boring process for a workpiece has a cylindrical shank 20, and a segment(s) 30 having diamond granules 32 is coupled to the shank 20.
[4] Here, the segment 30 is an element, in which the diamond granules 32 are sintered to a binder 34, wherein the diamond granules 32 comprise abrasive particles including natural diamond or artificial diamond, cubic boron nitride (c-BN) or alumina (Al O ), or silicon carbide (SiC) or titanium carbide (TiC).
[5] In a boring process, the diamond tool 10 is rubbed against a surface of a workpiece to bore a hole therethrough. In the diamond tool 10, at this time, the segment 30 performs substantially a cutting process.
[6] However, as the conventional diamond tool 10 is used for a long time, the segment
30 is worn out. At this time, a biased abrasion is easily generated on the segment 30, so that the life time of the diamond tool is remarkably reduced. In addition, when the conventional diamond tool 10 is used at the beginning, a process of positioning the segments 30 of the diamond tool 10 is required, so that it is impossible to use the diamond tool immediately after replacing segments with new ones. Furthermore, when the diamond tool 10 is used for machining a workpiece, chips generated from the workpiece is stuck to a surface of the diamond tool 10. Accordingly, there is a problem that a dressing process for removing the chips from the diamond tool should be performed additionally. Disclosure of Invention
Technical Problem
[7] The present invention is conceived to solve the aforementioned problems in the prior art. An object of the present invention is to provide a diamond tool, in which diamond granules are coupled by a sintering process and diamond granules are then fusion- bonded onto the sintered diamond granules to enhance cutting performance and a service life time thereof and to prevent a biased abrasion thereof from being generated during a cutting process, and a method for manufacturing the same. Technical Solution
[8] A diamond tool according to the present invention for achieving the object, which is coupled to a machining device to cut or grind a workpiece, comprises a shank coupled to the machining device; and a segment coupled to the shank and having diamond granules, wherein the segment comprises a first segment formed by sintering diamond granules and a binder, and a second segment formed by fusion-bonding diamond granules.
[9] Here, it is preferable that the first and second segments be alternately coupled.
Further, in the coupled structure of the first and second segments, the first and second segments may be vertically coupled or horizontally laminated and coupled to a surface of the shank. Furthermore, the second segment may be fusion-bonded to at least a portion of a surface of the first segment.
[10] In addition, a method of manufacturing a diamond tool according to the present invention for achieving the object comprises the steps of providing a shank to be coupled to a machining device; mixing diamond granules and a binder, and then sintering the mixture to form a first segment; fusion-bonding diamond granules to form a second segment; and alternately coupling the first and second segments and coupling them to the shank.
[11] Here, the second segment may be fusion-bonded to the first segment. Further, the second segment may be fusion-bonded to a surface of an auxiliary shank corresponding to the first segment in size.
[12] In addition, a method of manufacturing a diamond tool according to a further embodiment of the present invention for achieving the object comprises the steps providing a shank to be coupled to a machining device; mixing diamond granules and a binder and then sintering the mixture to form a first segment; fusion-bonding diamond granules on at least a portion of the first segment to form a second segment; and coupling the first segment having the second segment formed thereon to the shank. Advantageous Effects
[13] In a diamond tool and a method of manufacturing the same according to the present invention so configured, since diamond granules are coupled by alternately performing a sintering process and a fusion-bonding process, the cutting performance is enhanced, and the diamond granules coupled through the sintering process and the fusion- bonding process are not separated easily so that it is possible to prevent biased abrasion of the diamond tool from being generated. Further, when the sintered and fusion- bonded diamond granules are separated, since the diamond granules are arranged in a layered structure, the diamond tool has always constant cutting and grinding performance. Also, when the diamond granules having the layered structure are separated, a cutting or grinding process can be performed by new diamond granules, so that there is no need to perform a dressing process. In addition, since the diamond granules are always and constantly exposed when the diamond tool is used at the beginning, an initial positioning process is not required, so that a use, maintenance and repair of the diamond tool are convenient. Brief Description of Drawings
[14] Fig. 1 (a) and (b) are perspective views of a hole cutter- type diamond tool and a wire saw-type diamond tool according to a conventional art;
[15] Fig. 2 (a) and (b) are sectional views of the diamond tools shown in Fig. 1;
[16] Fig. 3 (a) and (b) are perspective views of a hole cutter- type diamond tool and a wire saw-type diamond tool according to an embodiment of the present invention;
[17] Fig. 4 (a) and (b) are sectional views of the diamond tools shown in Fig. 3;
[18] Fig. 5 is a sectional view of a diamond tool according to another embodiment of the present invention;
[19] Fig. 6 is a flowchart illustrating a method of manufacturing a diamond tool according to one embodiment of the present invention; and
[20] Fig. 7 is a flowchart illustrating a method of manufacturing a diamond tool according to another embodiment of the present invention. Best Mode for Carrying out the Invention
[21] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[22] Fig. 3 (a) and (b) are perspective views of a hole cutter-type diamond tool and a wire saw-type diamond tool according to an embodiment of the present invention, and Fig. 4 (a) and (b) are sectional views of the diamond tools shown in Fig. 3.
[23] As shown in Figs. 3 and 4, a diamond tool 110 according to the present invention is used for cutting or grinding a workpiece and comprises a shank 120 to be coupled to a machining device and a segment(s) 130 coupled to the shank 120, wherein diamond granules 132, 136 are fixedly maintained on the segment 130.
[24] The segment 130 comprises first segments 131 formed by sintering the diamonds granules 132 and binders 134 for fixedly maintaining the diamond granules 132 and second segments 135 formed by fusion-bonding a diamond granules 136.
[25] The diamonds granules 132 are uniformly distributed in the binder 134 comprising metal powders, ceramic, high molecular compound or the like, and they are sintered at a high temperature to thereby form the first segment 131.
[26] In the meantime, the second segment 135 is formed by fusion-bonding the diamond granules 136, and may further comprise an auxiliary shank to which the diamond granules 136 are attached. The auxiliary shank is coated with a filler 138 which is a mixture of metal and a binder, the diamond granules 136 are dispersed in the filler 138, and the filler and the diamond granules are then fusion-bonded at high temperature, thereby forming the second segment. Here, nickel filler is mainly used as the filler 138, and a method using nonmetallic heating body and a method using a high frequency induction coil may be mainly employed as the method of fusion-bonding the filler and the diamond granules.
[27] In the second segment 135, in the meantime, a portion of the filler 138 used for fusion-bonding the diamond granules 136 permeate the first segment 131, so that the coupling force between the first segment 131 and the second segment 135 is more increased.
[28] The first and second segments 131 and 135 formed as described above are alternately coupled to each other. Also, depending on the type of the workpiece to be cut and a cutting or grinding purpose, the first and second segments 131 and 135 may be coupled vertically to the shank, or laminated horizontally and then coupled to the shank. Also, it will be apparent that the first and second segments 131 and 135 are coupled vertically or horizontally in a combined manner, or coupled alternately. Preferably, the diamond tool may be configured such that the second segments 135 are positioned on a surface facing a direction in which a workpiece is cut and thus cut or grind the workpiece initially.
[29] In addition, the first and second segments 131 and 135 may be coupled to the shank
120 through an adhesive or by a method, such as silver soldering or laser welding.
[30] Accordingly, the second segment 135 of the diamond tool 110 of the present invention cuts first the workpiece. Here, since the diamond granules 135 are coupled by fusion-bonding, the second segment 135 has the excellent coupling and cutting force. In the meantime, in a case where the diamond granules 136 are separated from the second segment 135, the diamond granules 132 of the first segment 131 are exposed and then grind or cut the workpiece. In addition, since in the diamond tool 110 of the present invention, the first and second segments 131 and 135 are configured to have a layered structure, the separation of the diamond granules 132, 136 cause abrasion of a layered type of the diamond tool 110 not to be generated.
[31] Referring to Fig. 5, which is a sectional view of a diamond tool 210 according to another embodiment of the present invention, the diamond tool 210 comprises a shank 220 to be coupled to a machining device and a segment 230 coupled to the shank 210 and performing a substantial cutting or grinding process.
[32] Here, the segment 230 comprises a first segment 231 formed by sintering diamond granules 232 and a binder 234 and a second segment 235 formed by fusion-bonding the diamond granules 236 on a filler 238.
[33] In addition, the second segment 235 may be fusion-bonded to a portion of a surface of the first segment 231. At this time, it is more preferable that the second segment 235 is formed on a surface facing a direction in which the diamond tool 210 moves forward, i.e., a surface facing a direction in which a workpiece is cut.
[34] Accordingly, when a process of grinding or cutting a workpiece is carried out with the cutting tool 210, the second segment 235 cuts or grinds first the workpiece. In a case where the diamond granules 236 are separated from the second segment 235, the diamond granules 232 of the first segment 231 are exposed and then perform the process of cutting or grinding the workpiece.
[35] Fig. 6 is a flowchart illustrating a method of manufacturing a diamond tool according to one embodiment of the present invention. The method of manufacturing the diamond tool is illustrated with reference to the figure as follow.
[36] First, the method of manufacturing the diamond tool 110 comprises the step of providing the shank 120 to be coupled to a machining device (SlOO). The shank 120 may be formed depending on a shape of a workpiece and a machining purpose.
[37] After the shank 120 is provided, as the step (Sl 10) of forming the first segment 131, the diamond granules 132 and the binder 134 are mixed. At this time, the binder 134 may consist of metallic powder, ceramic or high molecular compound. Then, the binder 134 containing the diamond granules 132 is sintered to form the first segment 131. At this time, after the diamond granules 132 and the binder 134 are mixed, a frame having a predetermined shape is filled with the mixture and the mixture is then sintered to form the first segment 131 with a desired shape.
[38] There is the step (S 120) of forming the second segment 135 by fusion-bonding the diamond granules 132. Here, the second segment 135 may be fusion-bonded to and formed on the first segment 131. In addition, the second segment 135 may be formed by providing an auxiliary shank corresponding to the first segment 131 in size and fusion-bonding the diamond granules 136 and the filler 138 to a surface of the auxiliary shank.
[39] After the first and second segments 131 and 135 are provided, the first and second segments 131 and 135 are alternately coupled to the shank 120. At this time, the first and second segments 131 and 135 may be coupled perpendicularly to the shank 120 or the structure formed by laminating the first and second segments 131 and 135 horizontally may be coupled to the shank.
[40] The diamond tool as claimed in the present invention can be manufactured through the above processes (S 140).
[41] Fig. 7 is a flowchart illustrating a method of manufacturing a diamond tool according to another embodiment of the present invention. The method of manufacturing the diamond tool is illustrated with reference to the figure as follow.
[42] In the meantime, the method of manufacturing the diamond tool 210 according to the other embodiment comprises the step of providing the shank 220 to be coupled to a machining device (S200). After the shank 220 is provided, as the step (S210) of forming the first segment 231, the diamond granules 232 and the binder 234 are mixed. At this time, the binder 234 may comprise metallic powder, ceramic or high molecular compound. Then, the binder 234 containing the diamond granules 232 is sintered to thereby form the first segment 231. At this time, after the diamond granules 232 and the binder 234 are mixed, a frame having a predetermined shape is filled with the mixture and the mixture is then sintered to form the first segment 231 with a desired shape.
[43] Next, the diamond granules 236 and the filler 238 are fusion-bonded on a portion of a surface of the first segment 231 or the entire surface thereof, which faces a direction in which the diamond tool 210 moves forward for cutting or grinding a workpiece, thereby forming the second segment 235 (S220).
[44] Then, the first segment 231 on which the second segment 235 is formed is coupled to a surface of the shank 220 (S230). Here, the first and second segments 231 and 235 may be coupled to the shank 220 through an adhesive or by a method, such as silver soldering or laser welding.
[45] The diamond tool as claimed in the present invention can be manufactured through the above processes (S240).
[46] Although a diamond tool and a method of manufacturing the same according to the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the embodiments described above and the drawings. It will be apparent that those skilled in the art can make various modifications and changes thereto within the scope of the invention defined by the claims. Industrial Applicability
[47] The present is also applicable to a tool such as a core drill, a cutter, a saw blade, a saw, a wire saw, a polishing cup, a profiler and an end mill, as well as a tool such as a straight wheel, an ID wheel, a rotary dresser and an edge grinding wheel.

Claims

Claims
[1] A diamond tool to be coupled to a machining device to cut or grind a workpiece, comprising: a shank coupled to the machining device; and a segment coupled to the shank and having diamond granules, wherein the segment comprises a first segment formed by sintering diamond granules and a binder, and a second segment formed by fusion-bonding diamond granules.
[2] The diamond tool as claimed in claim 1, wherein the first and second segments are alternately coupled.
[3] The diamond tool as claimed in claim 2, wherein in the coupled structure of the first and second segments, the first and second segments are vertically coupled or horizontally laminated and coupled to a surface of the shank.
[4] The diamond tool as claimed in claim 1, wherein the second segment is fusion- bonded to at least a portion of a surface of the first segment. [5] A method of manufacturing a diamond tool, comprising the steps of: providing a shank to be coupled to a machining device; mixing diamond granules and a binder, and then sintering the mixture to form a first segment; fusion-bonding diamond granules to form a second segment; and alternately coupling the first and second segments and coupling them to the shank. [6] The method as claimed in claim 5, wherein the second segment is fusion-bonded to the first segment. [7] The method as claimed in claim 5, wherein the second segment is fusion-bonded to a surface of an auxiliary shank corresponding to the first segment in size. [8] A method of manufacturing a diamond tool, comprising the steps of: providing a shank to be coupled to a machining device; mixing diamond granules and a binder and then sintering the mixture to form a first segment; fusion-bonding diamond granules on at least a portion of the first segment to form a second segment; and coupling the first segment having the second segment formed thereon to the shank.
PCT/KR2008/006617 2007-11-13 2008-11-10 Diamond tools and manufacturing method of the same WO2009064093A1 (en)

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KR10-2007-0115691 2007-11-13

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JPH07164327A (en) * 1993-12-08 1995-06-27 Nec Corp Cutting blade and electrolytic dressing, grinding and cutting device
JPH08243928A (en) * 1994-12-27 1996-09-24 Toyota Banmotsupusu Kk Segment type grinding wheel and its manufacture
KR20050014522A (en) * 2003-07-31 2005-02-07 이화다이아몬드공업 주식회사 A bead which is easy to exhausting the chip and wire saw having it
KR20050080342A (en) * 2004-02-09 2005-08-12 신한다이아몬드공업 주식회사 Diamond tools with multi layers of abrasive grain and method for fabricating the same

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