WO2011028010A2 - Machining tips - Google Patents

Machining tips Download PDF

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Publication number
WO2011028010A2
WO2011028010A2 PCT/KR2010/005897 KR2010005897W WO2011028010A2 WO 2011028010 A2 WO2011028010 A2 WO 2011028010A2 KR 2010005897 W KR2010005897 W KR 2010005897W WO 2011028010 A2 WO2011028010 A2 WO 2011028010A2
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WO
WIPO (PCT)
Prior art keywords
machining
lines
diamond particles
tip
arbitrary section
Prior art date
Application number
PCT/KR2010/005897
Other languages
English (en)
French (fr)
Other versions
WO2011028010A3 (en
Inventor
Chang Hyun Lee
Original Assignee
Nextool 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 Nextool Co., Ltd. filed Critical Nextool Co., Ltd.
Publication of WO2011028010A2 publication Critical patent/WO2011028010A2/en
Publication of WO2011028010A3 publication Critical patent/WO2011028010A3/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/18—Sawing tools of special type, e.g. wire saw strands, saw blades or saw wire equipped with diamonds or other abrasive particles in selected individual positions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • B24D99/005—Segments of abrasive wheels

Definitions

  • the present invention relates to machining tips with diamond particles used as abrasive materials, and more particularly, to machining tips that are mounted on a rotating machining tool so as to perform a machining operation such as cutting, grinding, drilling or the like, in which diamond particles are arranged to have predetermined exposure intervals and heights on a machining surface thereby allowing their self-resharpening to be continuously performed.
  • Diamond tools are generally used for cutting, grinding and drilling workpieces in a wide variety of industrial fields such as concrete or asphalt for roads, construction blocks, stone, semiconductors or the like. At this time, the diamond tools have the types of cutting saws, grinding wheels, and dressing drills and thus have various purposes and shapes according to their types. Each of the diamond tools includes a shank having a given shape mounted on a rotary shaft of a power tool and machining tips attached on an operating surface of the shank.
  • the machining tips as parts for machining the workpieces are made of a superabrasive having a high hardness such as diamond or cubic boron nitride (CBN), which shows very high hardness and abrasion resistance.
  • the machining tips have sensitively different degrees of cutting efficiencies, chip discharging performance and abrasion rates of bond layers in accordance with the arrangement types of the superabrasive.
  • conventional machining tips are made by a process including the steps of making metal powder to the form of granules, mixing the granules and diamond particles on which the metal powder is coated, and molding and sintering the mixture in a desired form.
  • the characteristics of the metal powder granules are easily varied in accordance with the kinds of metal powder, which gives bad influences on the distribution of the diamond particles to cause them to be unfortunately segregated to certain locations. If the segregation of the diamond particles occurs, the abrasion of saw blades is made unevenly to cause the performance of the tool to be lowered, and further, as the saw blades enter the hard parts of the workpiece, they are bent horizontally to cause the cut workpiece to be defectively machined.
  • Korean Patent Application Laid Open No.2001-0006016 discloses a diamond tool having diamond particles regularly arranged in metal matrixes by using a regularly drilled pattern sieve in such a manner where the metal matrix layers with the diamond particles arranged thereon are laminated and bonded by means of a chemical brazing process.
  • the diamond particles are worn out during the machining work of the diamond tool, they naturally pop out from the metal matrix layers to allow other diamond particles distributed under the metal matrix layer with the abraded diamond particles to be naturally exposed, thereby gently conducting their self-resharpening.
  • the regularity of the diamond particles as mentioned in the conventional art is needed in other tools, so that they have the diamond particles regularly arranged on the machining tip thereof in the same arrangement shapes and intervals as them.
  • some problems have been found in view of the surface of the diamond tool on which a machining operation is carried out, a cutting saw, for example.
  • the heavy abrasion on the both side corners of the machining tips as mentioned above is also accelerated by secondary abrasion caused when the chips of a workpiece being machined produced by the machining operation are accumulated on the both side corners of the machining tips to larger quantities than those on the inside surfaces thereof.
  • the both side corners of the machining tips get generally rounded as the abrasion is developed. If the rounded shape becomes severe, the cutting operation is not carried out normally to cause the cutting saw to be operated at the wrong angle or to cause the cutting saw to be drastically worn out.
  • the present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a machining tip that is capable of arranging diamond particles on a machining surface in such a manner as to have predetermined exposure intervals among them, thereby allowing the self-resharpening of diamond particles to be continuously conducted.
  • machining tips that are mounted on a shank of a diamond tool for cutting, grinding or drilling a workpiece to be machined, the machining tips each including a plurality of diamond particles arranged on a plurality of lines made by dividing the machining tip into equal parts with respect to an arbitrary section in a direction of a width of the machining tip, the plurality of lines being in the form of a fan in such a manner as to become narrow in width as they are toward a base surface of the machining tip from a machining surface thereof.
  • the plurality of lines has internal angles formed by meeting the adjacent lines thereto in such a manner as to have equal intervals.
  • the plurality of lines has internal angles formed by meeting the adjacent lines thereto in such a manner as to have at least one unequal interval.
  • the internal angles are set within the internal angles formed by outermost imaginary lines connecting the both end points of the base surface and the center of the plurality of lines in accordance with the number of diamond particles arranged on the machining tip.
  • the diamond particles are arranged at equal intervals on each of the plurality of lines.
  • the center where the plurality of lines meet is positioned on an imaginary straight line passing the center of the machining surface and the center of the base surface formed on the arbitrary surface of the machining tip and is the center of a circle passing the both side corner points of the top end of the arbitrary section of the machining tip.
  • the diamond particles arranged on the machining surface of the arbitrary section of the machining tip are positioned at relatively larger intervals than those arranged on the base surface thereof as the center of the plurality of lines is near the machining surface or the base surface.
  • the center of the plurality of lines is the center of rotation of the shank to which the machining tip is fixed.
  • a plurality of auxiliary lines made by dividing the height of the arbitrary section into equal parts are formed on the concentric circles corresponding to the center of the plurality of lines, so that the diamond particles are arranged on crossing points at which the plurality of auxiliary lines and the plurality of lines are intercrossed.
  • a plurality of auxiliary lines made by dividing the height of the arbitrary section into equal parts are formed in a parallel relation to the base surface or the machining surface with respect to the plurality of lines, the base surface or the machining surface, so that the diamond particles are arranged on crossing points at which the plurality of auxiliary lines and the plurality of lines are intercrossed.
  • the intervals between the plurality? of auxiliary lines are smaller than the diameters of the diamond particles.
  • the plurality of auxiliary lines is formed at equal intervals with respect to any one of the plurality of lines.
  • the diamond particles are positioned at the crossing points on the plurality of lines formed sequentially near the machining surface or the base surface as they are towards the plurality of lines formed in any one side in a length direction of the arbitrary section of the machining tip, so that the respective diamond particles arranged on the arbitrary section are formed not overlapped and do not have any equal distances to each other and the imaginary lines connecting the centers of the respective diamond particles arranged on the arbitrary section are not straight lines.
  • the diamond particles are arranged in a symmetrical relation to each other on the both sides of the arbitrary section with respect to the center of the length direction of the arbitrary section of the machining tip.
  • arbitrary sections having equal thicknesses to the diameters of the diamond particles are laminated in the direction of width of the machining tip in such a manner as to have at least one same arrangement of the diamond particles.
  • arbitrary sections having equal thicknesses to the diameters of the diamond particles are laminated in the direction of width of the machining tip in such a manner as to have the arrangements of the diamond particles having at least one symmetrical left and right sides in the direction of length of the machining tip.
  • the arbitrary section on which the diamond particles are arranged and having equal thickness to the diameters of the diamond particles is formed on the both surfaces of the width direction of the machining tip, respectively.
  • At least one of the laminated arbitrary sections has irregular arrangements of the diamond particles.
  • the machining tip has the following advantages:
  • the protruded diamond particles serving as a machining blade have predetermined intervals and exposure heights in the direction of length of the machining tip, thereby allowing continuous self-resharpening to provide uniform cutting performance of the tool.
  • the spaces formed repeatedly with predetermined periods are made between the diamond particles, thereby serving as chip pockets through which chips are easily discharged to improve cutting performance and service life of the machining tip.
  • the intervals of the diamond particles on the same machining tip are adjusted to increase the abrasion rate of the diamond particles, thereby providing excellent and uniform performance at the initial process of the machining work.
  • a layer on which the diamond particles are regularly arranged and a layer on which the diamond particles are irregularly arranged are laminated in turn, thereby providing excellent performance through the layer on which the diamond particles are regularly arranged and preventing delamination by which the laminated surfaces are separated by the impacts and frictional forces occurring during use through the reduction of the bonding force between the laminated surfaces on which the diamond particles are concentrated on the same arbitrary section.
  • the concentration degrees of the diamond particles on the outside of the both side surfaces of the machining tip are higher than on the inside thereof, and alternatively, the sizes of the diamond particles on the outside of the both side surfaces thereof are smaller than on the inside thereof, thereby allowing the side abrasion of the machining tip to provide a uniform machining quality.
  • FIG.1 is a front view showing machining tips fixed on a shank according to a first embodiment of the present invention.
  • FIG.2 is a perspective view showing one machining tip among the machining tips according to the first embodiment of the present invention.
  • FIG.3 is a sectional view taken along the line A-A of FIG.2.
  • FIG.4 is an enlarged view showing the main parts of FIG.3.
  • FIG.5 is a front view showing machining tips fixed on a shank according to a second embodiment of the present invention.
  • FIG.6 is a perspective view showing one machining tip among the machining tips according to the second embodiment of the present invention.
  • FIG.7 is a sectional view taken along the line B-B of FIG.6.
  • FIG.8 is an enlarged view showing the main parts of FIG.7.
  • FIG.9 is a sectional view showing diamond particles distributed on an arbitrary section of the machining tip according to the present invention.
  • FIG.10 is a sectional view showing a second variation example of the distribution of diamond particles on the machining tip according to the first embodiment of the present invention.
  • FIG.11 is a sectional view showing a third variation example of the distribution of diamond particles on the machining tip according to the first embodiment of the present invention.
  • FIG.12 is a plane view showing a first example of the machining tip wherein arbitrary sections are laminated on the both side surfaces of the machining tip.
  • FIGS.13 and 14 are sectional and plane views showing a second example of the machining tip wherein the diamond particles are distributed laminatingly on the machining tip.
  • FIG.1 is a front view showing machining tips fixed on a shank according to a first embodiment of the present invention. As shown in FIG.1, a plurality of machining tips 1 is fixed at predetermined intervals on the outer circumference of a disc-shaped cutting shank 2 of a diamond tool.
  • FIG.2 is a perspective view showing one machining tip among the machining tips according to the first embodiment of the present invention.
  • the machining tip 1 has a height H, a length L and a width W.
  • the convex top surface of the machining tip 1 becomes a machining surface 11 and the concave bottom surface thereof becomes a base surface 12.
  • the base surface 12 has a concave bottom surface having the same curve as the outer circumference of the shank 2.
  • the line A-A is an arbitrary section of the machining tip 1.
  • FIG.3 is a sectional view taken along the line A-A of FIG.2, and FIG.4 is an enlarged view showing the main parts of FIG.3.
  • a plurality of lines 4 is made by dividing the machining tip 1 into equal parts, in the form of a fan in such a manner as to become narrow in width as they are toward the base surface 12 from the machining surface 11.
  • diamond particles 3 are positioned on the plurality of lines 4 formed on the arbitrary section of the machining tip 1.
  • the plurality of lines 4 in the form of fan has internal angles formed by meeting the adjacent line 4 thereto in such a manner as to have equal intervals. This allows the diamond particles 3 to be regularly self-regenerated on the machining surface 11 of the machining tip 1.
  • the plurality of lines 4 in the form of fan has internal angles formed by meeting the adjacent line 4 thereto in such a manner as to have unequal intervals. This allows the distribution of the diamond particles 3 to be relatively concentrated on any one side, both sides or center of the length of the machining tip 1 with respect to the arbitrary section in the direction of the width W of the machining tip 1 in accordance with specific purposes of the machining tip 1, thereby sufficiently improving the cutting rate.
  • the internal angles of the plurality of lines 4 formed on the arbitrary section of the machining tip 1 are varied in accordance with the use purposes of the diamond tool and the number of diamond particles formed on a predetermined region. According to the present invention, the internal angles are set within the internal angles of the outermost imaginary lines 7 connecting the both end points 111 of the machining surface 11 or the both end points of the base surface 12 and a center ce. In this case, the internal angles are not limited to any specific value.
  • the internal angles are varied, depending upon the concentration degrees of the diamond particles 3 on the arbitrary section of the machining tip 1, the sizes of the diamond particles 3, the center of the plurality of lines 4 made by the division of the machining tip 1 into equal parts, the number of diamond particles 3 positioned on the machining tip 1, the size of the machining tip 1, and so on.
  • the plurality of lines 4 made by the division of the machining tip 1 into equal parts are formed to the form of fan on the arbitrary section of the machining tip 1, the diamond particles 3 become enlarged at their intervals as they are toward the upper part of the machining surface 11 from the lower part of the base surface 12, thereby gradually increasing the abrasion rate.
  • the operation of the diamond tool can be stabilized in an unstable initial process in which vibration and shaking are caused by the instability of the exposure of the diamond particles 3 of the machining tip 1 and the deviation of the weights of the machining tips 1.
  • the plurality of lines 4 made by the division of the machining tip 1 into equal parts should be equally formed on the arbitrary section of the machining tip 1 so as to allow the diamond particles 3 to be regularly self-regenerated on the machining surface 11. Accordingly, the points, which are formed by meeting the respective lines 4 passing the both end points 111 of the top end of the arbitrary section and the imaginary straight line 5 passing the center of the machining surface 11 and the center of the base surface 12, correspond to the center ce of a circle C.
  • the center of the plurality of lines 4 made by the division of the arbitrary section of the machining tip 1 into equal parts desirably corresponds to the center of the rotation of the shank 2 of the machining tip 1.
  • auxiliary lines 6 made by dividing the height of the arbitrary section into equal parts are formed on the concentric circles corresponding to the center ce of the plurality of lines 4 made by the division of the machining tip 1 into equal parts.
  • the machining tip 1 further includes the plurality of auxiliary lines 6 made by dividing the height H of the arbitrary section into equal parts in such a manner as to be formed on the concentric circles corresponding to the center ce of the plurality of lines 4 made by the division of the machining tip 1 into equal parts, and the diamond particles 3 are arranged on the crossing points P at which the plurality of auxiliary lines 6 and the plurality of lines 4 are intercrossed.
  • the crossing points P at which the plurality of auxiliary lines 6 and the plurality of lines 4 are intercrossed are formed at equal intervals on all of the plurality of lines 4. Accordingly, the diamond particles 3 are self-regenerated at equal intervals.
  • the machining tip 1 has the plurality of auxiliary lines 6 made by dividing the height H of the arbitrary section into equal parts in such a manner as to be formed in a parallel relation to the base surface 12 or the machining surface 11, and the diamond particles 3 are positioned on the crossing points P at which the plurality of auxiliary lines 6 and the plurality of lines 4 are intercrossed.
  • the crossing points P which are formed on the imaginary line 5 to be formed in a parallel relation to the base surface 12 or the machining surface 11, have equal distances to each other, but the crossing points P, which are formed on the lines 4 formed at the both sides of the arbitrary section, do not have any equal distances to each other.
  • the circumference of the machining surface 11 formed at the outermost side of the arbitrary section is the same as the base surface 12 with a result of being formed really smaller when compared with the theoretical outer circumference of the arbitrary section.
  • the auxiliary lines 6 are arranged toward the base surface 12 in a parallel relation to the outermost side of the machining surface 11, the outer diameter of the base surface 12 becomes larger than the theoretical outer diameter thereof.
  • the machining surface 11 or the base surface 12 of the machining tip 1 is a concentric circle corresponding to the center ce of the rotating shank 2, the diamond particles 3 positioned on the machining surface 11 sequentially have the same self-resharpening period as each other as the diamond tool is worn out.
  • the diamond particles 3 of the machining tip 1 are positioned at the crossing points P on the plurality of lines 4 formed in any one side in a length direction of the arbitrary section of the machining tip 1 in such a manner as to be sequentially near the machining surface 11 or the base surface 12.
  • the respective diamond particles 3 arranged on the arbitrary section are formed not overlapped. Also, the respective diamond particles 3 arranged on the arbitrary section do not have any equal straight line distances to each other in the direction of the length L. This is because the plurality of lines 4 becomes narrow at their intervals as they are toward the base surface 12 from the machining surface 11 because of the plurality of lines 4 being in the form of fan.
  • the imaginary lines connecting the centers of the diamond particles 3 arranged on the arbitrary section are in the form of a curved line or parabola. This is because the plurality of lines 4 is in the form of fan. That is, the diamond particles 3 arranged on the plurality of lines 4 are formed at the state of being more inclined by the internal angles of each of the lines 4 on which the next diamond particles are arranged as they are toward any one of the arbitrary section in the direction of the length L of the machining tip 1.
  • the diamond particles 3 may be arranged in a symmetrical relation to each other with respect to the center of the length direction of the arbitrary section of the machining tip 1. Accordingly, the diamond particles 3 have the same arrangements on the both sides of the arbitrary section of the machining tip 1 fixed to the rotating diamond tool, so that the both sides of the machining tip 1 can be worn out with equal abrasion amounts, thereby improving the cutting rate of the diamond tool.
  • the plurality of auxiliary lines 6 should be formed at equal intervals as each other by dividing the height of the arbitrary section of the machining tip 1 into equal parts. This provides the uniform performance of the diamond tool.
  • the diamond particles 3 should be arranged not overlapped at the crossing points P on the arbitrary section of the machining tip 1. Also, the diamond particles 3 are irregularly arranged at the crossing points P on the arbitrary section of the machining tip 1. So as to regularly self-regenerate the diamond particles 3 on the machining surface 11, preferably, the centers of the diamond particles 3 should correspond to the crossing points P.
  • the equally divided intervals among the plurality of auxiliary lines 6 on the arbitrary section of the machining tip 1 should be less than the diameters of the diamond particles 3 so as to continuously self-regenerate the diamond particles 3.
  • the diamond particles 3 are regularly self-regenerated on the machining surface 11, thereby allowing the continuous and uniform machining performance of the diamond tool.
  • the plurality of auxiliary lines 6 may be made by dividing the height of the arbitrary section into unequal parts in accordance with the conveniences of the machining work or the specific purpose.
  • groups of diamond particles 3 are formed on the plurality of lines 4 being in the form of fan, having predetermined distances from the center ce of the plurality of lines 4 and equal intervals among the plurality of lines 4 repeated along the length direction of the machining tip 1.
  • the diamond particles 3 are distributed with cyclic arrangements on the machining tip 1, so that the machining work is repeatedly carried out with predetermined intervals between the diamond particles 3 and predetermined exposure degrees of the diamond particles 3.
  • the diamond particles 3 may be distributed symmetrically on the both sides of the arbitrary section with respect to the imaginary line 5 formed to pass the center of the machining surface 11 and the center of the base surface 12.
  • the symmetrical distribution of the diamond particles 3 on the both sides of the arbitrary section can prevent the existence of a region where the diamond particles 3 to be self-regenerated on the machining surface 11 are not distributed on any one side of the both sides of the arbitrary section, thereby allowing uniform abrasion of the diamond particles 3.
  • the diamond particles 3 may be distributed at the crossing points P where the plurality of lines 4 to which their intervals are added as they are toward any one side of the arbitrary section are intercrossed with the auxiliary lines 6 spaced from the machining surface 11.
  • the above-mentioned various arrangements of the diamond particles 3 are desirably determined in accordance with the particle sizes of the diamond particles, the concentration degrees of the diamond particles, the dimensions of the machining tip, the outer appearances of the diamond tool, the use purposes of the diamond tool and the like.
  • FIG.5 is a front view showing machining tips fixed on a shank according to a second embodiment of the present invention
  • FIG.6 is a perspective view showing one machining tip among the machining tips according to the second embodiment of the present invention.
  • machining tips 1 are used for diamond tools for grinding or drilling, each including the machining surface 11 and the base surface 12 in the form of a straight line.
  • the machining tips 1 are fixed on the outer circumference of a cylindrical shank 2.
  • the machining tip 1 has a height H, a length L and a width W and is bent in a direction of the length L to a concave shape toward a center direction of a rotary shaft of the shank 2.
  • FIG.7 is a sectional view taken along the line B-B of FIG.6, and FIG.8 is an enlarged view showing the main parts of FIG.7.
  • the flat top surface of the machining tip 1 becomes the machining surface 11.
  • the machining surface 11 is in the form of straight line connecting the both side top ends of the arbitrary section thereof.
  • the plurality of lines 4 forming the crossing points P at which the diamond particles 3 are positioned are made in the same manner as in the first embodiment of the present invention, and the plurality of auxiliary lines 6 is made by dividing the height of the arbitrary section into equal parts in a parallel relation to the base surface 12 or the machining surface 11 with respect to the base surface 12 or the machining surface 11.
  • the arrangements of the diamond particles 3 are the same as those in the first embodiment of the present invention.
  • the auxiliary lines 6 may be formed at equal or unequal intervals, but in the second embodiment of the present invention, they are preferably formed at equal intervals.
  • the center of the machining surface 11 and the center ce of the plurality of lines 4 are not really positioned at the same line of the arbitrary section of the machining tip 1, but the center ce of the plurality of lines 4 is appropriately positioned at the straight line passing the center of the machining surface 11 and the center of the base surface 12 in accordance with the concentration degrees and sizes of the diamond particles 3 to be formed on the machining tip 1.
  • the plurality of lines 4 may be made by forming a circle C passing the both side ends of the machining surface 11 of the arbitrary section with respect to the center ce.
  • the plurality of auxiliary lines 6 made by dividing the height of the arbitrary section into equal parts becomes in the form of straight lines.
  • the plurality of auxiliary lines 6 are formed in a parallel relation to the machining surface 11, so that the diamond particles 3 are regularly and sequentially self-regenerated on the machining surface 11, thereby allowing uniform cutting forces of the machining tip 1.
  • the plurality of lines 4 are in the form of fan, the intervals of the diamond particles 3 on the machining surface 11 become larger than those on the base surface 12, thereby allowing early stabilization of the diamond tool.
  • FIG.9 is a sectional view showing diamond particles distributed on an arbitrary section of the machining tip according to the present invention.
  • the arrangements of the diamond particles according to the first and second embodiments of the present invention are almost the same. Accordingly, the arrangements of the diamond particles 3 on the arbitrary section of the machining tip 1 will be described with reference to the first embodiment of the present invention.
  • the whole shape of the machining tip 1 will be explained with reference to FIG.2.
  • the arbitrary section is a surface extended to the direction of length L of the machining tip 1 from which the section of the same width W is extended in the direction of the width W of the machining tip 1.
  • FIG.9 shows the arrangements of the diamond particles 3 as described above, and as shown in the enlarged circle of FIG.9, it is appreciated that the internal angles of the straight lines L2 connecting tangent lines L1 having right-angled internal angle with respect to the plurality of lines 4 and the crossing points P, that is, the centers of the diamond particles 3 are the same as each other. According to the first embodiment of the present invention, it is understood that the diamond particles 3 are distributed with the same internal angles of 7 . It is also understood that the internal angles of the crossing points P are the same with respect to the tangent lines L1. The lines connecting the respective crossing points P are straight lines but the lines connecting the whole crossing points P are parabolas.
  • the diamond particles 3 are reduced at their intervals as they are toward the base surface 12 from the machining surface 11 because of the plurality of lines 4 in the form of fan. As mentioned above, the diamond particles 3 are relatively reduced at their intervals as they are toward the base surface 12 from the machining surface 11, and contrarily, the diamond particles 3 are relatively increased at their intervals as they are toward the machining surface 11 from the base surface 12.
  • the crossing points P are formed to the shape of parabola, as shown in Table 1, wherein an inclination is increased as it is toward the lower part of the right side from the upper part of the left side when seen from the arbitrary section of the machining tip.
  • the diamond particles 3 are self-regenerated protrudedly along the machining surface 11 with the same repetition periods and abrasion rates, thereby allowing uniform cutting forces and performance of the machining tip 1.
  • the diamond particles 3 have cyclic arrangements wherein the internal angles of the straight lines L2 connecting the tangent lines L1 of the diamond particles 3 arranged using the plurality of lines 4 with respect to the center ce of a rotary body and the centers of the diamond particles 3, that is, the crossing points P, are the same, so that during the abrasion of the machining surface 11, the diamond particles 3 are continuously self-regenerated, while always having the same intervals and exposure degrees on the machining surface 11.
  • the machining tips 1 which each have the machining surface 11 and the base surface 12 having the shape of a curved arch, are fixed on the outer circumference of the disc-shaped shank 2 for cutting or grinding diamond tools.
  • a first variation example of the present invention is different from the first embodiment of the present invention in that the plurality of lines 4 are made by dividing the arbitrary section of the machining tip 1 into equal and unequal parts. If the plurality of lines 4 is formed with the equal and unequal parts, the abrasion rate and cutting performance of the bond are adjustable by the parts along the direction of length L of the machining tip 1, while the cutting performance for a workpiece material having high bond abrasion rate is being maintained. As a result, according to the first variation example of the present invention, the machining tip 1 can be utilized with specific purposes such as the purpose of abrasion resistance or the like.
  • FIG.10 is a sectional view showing a second variation example of the distribution of diamond particles on the machining tip according to the first embodiment of the present invention.
  • the second variation example of the present invention is different from the first embodiment of the present invention in that the distance between the center of the machining surface 11 of the machining tip 1 and the center(,) ce of the circle is shorter than that in the first embodiment of the present invention.
  • the center ce of the circle is moved by a predetermined distance toward the machining surface 11 or the base surface 12.
  • the diamond particles 3 have relatively large intervals as they are toward the machining surface 11 as the outer diameter side of the machining tip 1 from the base surface 12 as the inside diameter side thereof, thereby allowing the concentration degrees of the diamond particles to be locally lowered. Accordingly, the abrasion in the unstable region at the initial machining process of the machining tip is easily achieved, thereby obtaining the early stabilization of the machining tool.
  • the arrow shown in FIG.10 indicates the movement of the center ce toward the machining surface 11 or the base surface 12.
  • FIG.11 is a sectional view showing a third variation example of the distribution of diamond particles on the machining tip according to the first embodiment of the present invention.
  • the third variation example of the present invention is different from the first embodiment of the present invention in that the diamond particles 3 are distributed symmetrically on the both sides of the arbitrary section with respect to the imaginary line 5 formed to pass the center of the machining surface 11 and the center of the base surface 12 of the machining tip 1.
  • the symmetrical distribution of the diamond particles 3 prevents one side surface of the machining surface 11 of the machining tip 1 from being worn out earlier than the other side thereof.
  • FIG.12 is a plane view showing a first example of the machining tip wherein an arbitrary section is laminated on the both side surfaces of the machining tip, respectively.
  • an arbitrary section is formed on the both side surfaces of the machining tip 1 having the arbitrary section according to the first embodiment of the present invention.
  • the arbitrary section is in a form of a layer having a thickness equal to the diameters of the diamond particles 3 and the diamond particles embedded thereinto with a predetermined arrangement.
  • one or more layers of arbitrary sections are formed with the specific arrangements of the diamond particles 3 having different particle sizes and concentration degrees on the both side surfaces wherein the frequencies of the contact with the workpiece are highest when the workpiece is cut with the machining tip 1, thereby increasing the performance of the product when in use for specific environments.
  • the differences of the abrasion gradients between the regularly laminated layers are minimized, thereby permitting the bonding material on the machining surface 11 to be uniformly abraded to maintain cutting performance.
  • the arrangements of the diamond particles 3 between the arbitrary sections formed on the both side surfaces of the machining tip 1 are made with regular distribution as mentioned above, and alternatively, with commercially irregular distribution.
  • FIGS.13 and 14 are sectional and plane views showing a second example of the machining tip wherein the diamond particles are distributed laminatingly on the machining tip.
  • the arbitrary sections employed in the first or second embodiment of the present invention, on which the diamond particles 3 distributed in predetermined arrangements along the direction of width W of the machining tip 1, are laminated in the direction of width W of the machining tip 1 in such a manner as to have at least one or more symmetrical left and right sides thereof.
  • the arbitrary sections are in a form of layers each having a thickness equal to the diameters of the diamond particles 3 and the diamond particles 3 embedded thereinto with a predetermined arrangement.
  • the layer on which the diamond particles 3 are distributed with a predetermined arrangement as mentioned in the first example of the machining tip 1 can be laminated with the layer on which the diamond particles 3 are distributed arbitrarily.
  • the formation of the layer on which the diamond particles 3 are distributed with a predetermined arrangement allows the machining tip 1 to have excellent performance, and further, as the layer on which the diamond particles 3 are distributed arbitrarily is laminated, the diamond particles 3 are concentrated on the same surfaces between the laminated layers, thereby preventing delamination by which the laminated surfaces are separated by the impacts and frictional forces occurring during use through the reduction of the bonding force.
  • the dotted circles in FIG.13 indicate the laminated diamond particles 3 with predetermined arrangements that are overlapped on one arbitrary section. Accordingly, it can be understood that the diamond particles 3 on the adjacent laminated layers are self-regenerated at different positions on the machining surface 11 of the machining tip 1.
  • a method for manufacturing the machining tip according to the above-mentioned embodiments of the present invention includes the steps of molding and pressurizing a metal bond material by using a punch indenter having the same arrangement patterns as the arrangement positions of the diamond particles 3 to form predetermined indentations in which the diamond particles are mounted. Next, the diamond particles 3 are inserted into the indentations, thereby producing the metal bond material to which the diamond particles 3 are fixed.
  • the produced metal bond materials are laminated, cold-molded and sintered to make the machining tip 1. Further, the machining tip 1 may be made according to commercial various manufacturing methods.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
PCT/KR2010/005897 2009-09-04 2010-09-01 Machining tips WO2011028010A2 (en)

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KR1020090083670A KR101126107B1 (ko) 2009-09-04 2009-09-04 가공팁
KR10-2009-0083670 2009-09-04

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WO2011028010A3 WO2011028010A3 (en) 2011-07-21

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WO2011028010A3 (en) 2011-07-21
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