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WO2018021753A1 - Foret à insert - Google Patents

Foret à insert Download PDF

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Publication number
WO2018021753A1
WO2018021753A1 PCT/KR2017/007753 KR2017007753W WO2018021753A1 WO 2018021753 A1 WO2018021753 A1 WO 2018021753A1 KR 2017007753 W KR2017007753 W KR 2017007753W WO 2018021753 A1 WO2018021753 A1 WO 2018021753A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert
drill
center
cutting
insertion hole
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2017/007753
Other languages
English (en)
Korean (ko)
Inventor
노인원
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from KR1020170062045A external-priority patent/KR101825514B1/ko
Application filed by Individual filed Critical Individual
Publication of WO2018021753A1 publication Critical patent/WO2018021753A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills

Definitions

  • the present invention relates to an insert drill having an improved cutting speed, and more particularly, to an insert drill that can easily select a center position during hole processing and can improve a cutting speed.
  • the insert drill is a drill that is used by mounting the insert of the material stronger than the workpiece at the tip of the drill body, the actual cutting is performed by the insert, and when the tool wears, only the insert mounted on the drill body can be replaced and maintained.
  • the maintenance is very convenient.
  • FIG. 1 is a perspective view showing a conventional insert drill
  • Figure 2 is a view showing a planar structure of a conventional insert drill.
  • a spiral flute 110 is formed in a cylindrical drill body 100, and a pair of inserts 200 and 300 are bolted to an end portion thereof.
  • a channel 120 is formed at the front end of the drill body 100 to supply coolant to the shear cutting surface of the drill, and the first and second inserts 200 and 300 are inserts formed at the front end of the drill body 100. It is inserted into each of the insertion recesses and fixed by bolts.
  • the first and second inserts 200 and 300 are installed outward from the center of the XY axis of the drill body 100 as shown in FIG. 2, and when the hole is processed, the first insert 200 has an outer diameter direction based on the center of the hole. And the second insert 300 is cut inward from the outer diameter of the hole.
  • the conventional insert drill is installed away from the center of the drill body 100, so that it is difficult to select a center position when drilling holes, and two inserts are used, but the cutting area of each insert is separated, so that the actual cutting operation is performed by one blade. Will be done.
  • the two inserts each process a different area, so that the drill body 100 must be rotated 360 ° in order to process the entire surface of the hole.
  • the present invention has been made to solve the above problems, the object of the present invention is to insert the center drill insert in the center of the drill body to facilitate the selection of the center position during hole processing, the insert is mounted symmetrically on both sides of the center drill insert Therefore, it is possible to improve cutting speed by balancing with 2 blades on both sides.
  • the insertion hole is formed in the center of the tip, the insert seating portion is formed so as to be symmetrical to both sides of the insertion hole, spirally in the longitudinal direction along the outer peripheral surface from the upper end downward
  • a drill body having a first flute is formed, and a lower end is inserted into the insertion hole, and is formed to protrude to the tip of the drill body, and the web is symmetrically formed at both sides such that the tip is inclined downward from the center point in a circular shape.
  • a center drill insert is formed to be symmetrically on both sides of the insertion groove which is inclined from the top to the inner center at a predetermined length, and a cutting edge is formed on the slope of the front edge in a hexahedron shape, so as to be symmetrical on both sides of the center drill insert.
  • a web surface of the center drill insert and the first and second cutting parts may include a first and second cutting inserts having a surface in close contact with the insertion groove, and a bottom surface adjacent to one side thereof, and the first and second cutting inserts seated on the insert seating portion. It is coupled to the drill body such that the cutting edge of the insert is continuously continuous.
  • the center drill insert is formed with a second flute downward corresponding to the inclined direction of the first flute downward along the web blade, and an end surface of the second flute is coupled to the first flute continuously.
  • a blade is coupled to protrude forward than the front surface of the first and second cutting inserts along the direction of rotation of the drill body, so that a step is formed between the web blade and the cutting edge.
  • a seating surface is formed in the lower end of the insertion groove is in close contact with the bottom surface of the first, second cutting insert, the upper end of the insertion groove is in close contact with the upper side of the first, second cutting insert Guide protrusion surface is formed.
  • a fastening hole communicating with the insertion hole is formed on an outer surface of the drill body, and the center drill insert is bolted through the fastening hole.
  • a seating jaw is formed so that the insert seating portion is symmetrical to both sides of the insertion hole so that the bottom surfaces of the first and second cutting inserts are seated on the seating jaw, and a seating side wall is formed upward at an edge of the seating jaw.
  • the rear surfaces of the first and second cutting inserts are in close contact with the seating side walls, and fastening holes for bolting with the first and second cutting inserts are formed at the seating side walls.
  • the drill body has a first insertion hole penetrates downwardly in the center of the tip, and an insert seating portion is formed to be symmetrical to both sides of the first insertion hole, and a spiral first flute is formed in a longitudinal direction along an outer circumferential surface thereof.
  • the body and the lower body is coupled to the lower portion of the upper body and the spiral first flute is continuous downward, the upper end is formed with a second insertion hole in communication with the first insertion hole formed in the lower end of the upper body,
  • the center drill insert may include a main body portion in which the web blade and the insertion groove are formed, and an extension coupling portion extending downward of the main body portion and inserted into the drill body through the first insertion hole and the second insertion hole. It is provided including more.
  • the outer surface of the upper body and the lower body is formed with a first fastening hole and a second fastening hole communicating with the first insertion hole and the second insertion hole, the center drill insert through the first and second fastening hole
  • the bolt is fastened, but the evaluation hole is formed on the outer surface of the main body portion and the extension coupling portion of the center drill insert corresponding to the first fastening hole and the second fastening hole so that the end surface of the bolt is in close contact with the evaluation hole.
  • a seating jaw protrudes along the inner edge of the first insertion hole, and a stepped jaw is formed between the main body portion and the extended body portion of the center drill insert to be seated on the seating jaw.
  • the lower end portion of the upper body is formed with a rotational force transmission protrusion protruding downward and the upper end portion of the lower body is formed with a fitting groove corresponding to the rotation preventing projection, the rotational force transmission projection is inserted into the fitting groove so that the upper body is Rotate integrally with the lower body.
  • the center position selection is It is very easy to improve the cutting speed by balancing the left and right two blades, and the cutting edges of the center drill insert and the cutting edges of the first and second cutting inserts are stepped so that the cutting chips formed by hole processing It is separated from each other by a single flute can be discharged downward while reducing the area of the flute to facilitate chip discharge to increase the drill body itself rigidity, there is no fear of damage to the drill body in high-speed processing, there is a very excellent workability.
  • both sides of the center drill insert are tightly coupled to the upper and lower sides and one side of the first and second cutting inserts, so that the center drill insert is integrated with the first and second cutting inserts during hole processing so that the center drill insert is not deviated from its position without shaking and stably. It is possible to improve productivity by cutting.
  • the drill body is formed into a structure that is separated into the upper and lower parts, so that when the upper end of the drill body is worn, only the upper body can be replaced and used, and only a separate upper body is provided for each insert shape, thereby reducing the cost of replacing the drill body. It is effective to let.
  • FIG. 1 is a perspective view showing a conventional insert drill.
  • FIG. 2 is a view showing a planar structure of a conventional insert drill.
  • FIG. 3 is a view showing the structure of an insert drill according to the present invention.
  • FIG 4 is a view showing a part of the side of the insert drill according to the present invention.
  • FIG. 5 is a cross-sectional view taken along the line AA ′ of FIG. 4.
  • FIG. 6 is a cross-sectional view taken along the line B-B 'of FIG.
  • FIG. 7 is an exploded perspective view of the insert drill according to the present invention.
  • FIG 8 is an exploded perspective view of an insert drill according to another embodiment of the present invention.
  • FIG. 9 is a view showing a cross-sectional structure of the insert drill according to another embodiment of the present invention.
  • FIG. 3 is a view showing the structure of the insert drill according to the present invention
  • Figure 4 is a view showing a part of the side of the insert drill according to the present invention
  • Figure 5 is a view showing a cross-sectional structure of the line AA 'of
  • FIG. 6 is a cross-sectional view taken along line BB ′ of FIG. 5
  • FIG. 7 is an exploded perspective view of the insert drill according to the present invention.
  • the insert drill according to the present invention is equipped with a center drill insert 20 at the front end of the drill body 10, the first and second cutting inserts 30a, 30b) are installed continuously.
  • first and second cutting inserts 30a and 30b installed in the insert drill according to the present invention have the same specifications as the conventional hexahedral inserts mounted on the insert drill. ) Is formed to rotate the slope when the cutting edge 31 is worn so as to alternately use the cutting edge 31.
  • the drill body 10 is cylindrical in shape and has a spiral-shaped first flute 14 formed in a longitudinal direction along an outer circumferential surface from the upper end portion thereof, and a center drill insert 20 is inserted in the center of the tip end of the drill body 10.
  • the insertion hole 11 is formed to be formed, and the first and second cutting inserts 30a and 30b are seated on the insert seating portions 12 formed to be symmetrical on both the left and right sides of the insertion hole 11, thereby forming a center drill.
  • the cutting edges 31 of the first and second cutting inserts 30a and 30b are continuously disposed on both the left and right sides of the insert 20.
  • a fastening hole 13 penetrating into the insertion hole 11 is formed on the outer surface of the drill body 10, and the center drill insert 20 inserted into the insertion hole 11 is bolted through the fastening hole 13. Is fastened to.
  • the insert seating portion 12 has a seating jaw 12a formed to be symmetrical to both sides of the insertion hole 11, and any of the cutting edges 31 formed on the slopes of the first and second cutting inserts 30a and 30b.
  • One side is faced upward so that one side (a) is seated on seating jaw 12a.
  • a seating side wall 12b is formed upwardly at the corner of the seating jaw 12a so that the rear surface b of the first and second cutting inserts 30a and 30b is in close contact with the seating side wall 12b. 12b), fastening holes 12b-1 for bolting to the first and second cutting inserts 30a and 30b are formed, respectively.
  • the mounting jaw 12a is formed to be inclined with the mounting side wall 12b at an angle corresponding to an angle formed by the rear and side surfaces of the first and second cutting inserts 30a and 30b.
  • the center drill insert 20 has a lower end inserted into the insertion hole 11 and protrudes toward the tip of the drill body 10.
  • the tip end of the center drill insert 20 is cylindrical inclined downward from the center of the circle.
  • the web blade 21 is formed to be symmetrical to both sides.
  • the outer surface of the center drill insert 20 is formed such that insertion grooves 22 into which one side surface of the first and second cutting inserts 30a and 30b are inserted are symmetrical to the left and right sides, and thus the first and second cutting inserts (30a, 30b) is in close contact with the mounting groove 22 and the seating jaw (12a) and the seating side wall (12b) of the insert seating portion 12 is coupled to the drill body 10,
  • the insertion groove 22 is a center drill It is formed to be inclined at a predetermined length from the top of the insert 20 to the inner center, and the seating jaw 12a is formed to be inclined downward from the center of the insertion hole 11 to the outside, so that the first and second cutting inserts 30a,
  • the cutting surface 31 of 30b) is provided on the drill body 10 so as to be inclined downwardly outward continuously continuously as a whole with the web blade 21 of the center drill insert 20.
  • the lower end of the insertion groove 22 of the center drill insert 20 is formed with a seating surface 24 which is in close contact with a portion of the bottom surface of the first and second cutting inserts (30a, 30b), the upper end of the insertion groove 22
  • the guide protrusion surface 25 is formed in close contact with the upper one side surface of the first and second cutting insert
  • the front surface of the first and second cutting insert (30a, 30b) is the direction in which the drill body 10 is rotated
  • One side (c) is in close contact with the insertion groove (22) in the upright state to face the bottom surface (a) adjacent to the one side (c) is the seating surface 24 and the insert seating portion 12
  • the upper surface (d), which is seated on the jaw (12a) and adjacent to one side (c), is partially adhered to the guide protrusion surface (25), and the rear surface (b) is a seating side wall (12b) of the insert seating portion (12) Close to
  • the upper, lower, left, and right sides and the rear surfaces of the first and second cutting inserts 30a and 30b are in close contact with the drill body 10 and the center drill insert 20, and thus the first and second cutting inserts are used during hole processing.
  • the load applied to the cutting edge 31 of the 30a and 30b is supported, and the first and second cutting inserts 30a and 30b are brought into close contact with each other in the cutting process so as to remain in place without shaking.
  • the first and the second members are installed to stand upright by a load applied in the rotational direction of the drill body 10. 2
  • the first and second cutting inserts 30a and 30b are squeezed from the front surface of the cutting inserts 30a and 30b toward the seating side wall 12b to further secure the fixing force of the first and second cutting inserts 30a and 30b.
  • the first and second cutting inserts 30a and 30b are firmly attached to both sides of the center drill insert 20 in an inclined direction so that the center drill insert 20 does not flow and does not move out of position without shaking. It is closely supported.
  • center drill insert 20 is formed with a second flute 23 through which the cutting chips are discharged downward along the web blade 21, and the second flute 23 is in an inclined direction of the first flute 14. It is formed in a direction corresponding to the end surface of the second flute 23 is coupled so as to be continuous with the first flute (14).
  • first and second flutes 14 and 23 are joined so that the cutting chips are cut by the web blade 21 so that the first flutes 14 and 23 are adjacent to the web blade 21.
  • follow 14) to discharge continuously.
  • the cutting edges of the first and second cutting inserts 30a and 30b are continuously installed on both sides of the center drill insert 20 inserted into the center of the drill body 10 so as to be horizontally symmetrical.
  • the cutting speed can be improved and the cutting speed can be improved by adjusting the balance between two left and right sides, so that the web blade 21 of the center drill insert 20 is in contact with the center of the hole processing target surface.
  • the hole processing surface is continuously contacted from the web edge 21 to the cutting edge 31 of the cutting inserts 30a and 30b on one side, thereby forming a spiral flute 14 for discharging chips.
  • the center drill insert 20 and the first and second cutting inserts 30a and 30b are not formed on the drill body 10 separately, but downward to the first and second cutting inserts 30a and 30b on both sides. Only one of each will be formed.
  • the present invention can reduce the cutting area of the drill body 10 to form the flute 14 on the drill body 10 so that the drill body 10 can increase its own rigidity.
  • the drill body 10 By increasing the rigidity of the drill body 10 itself, in the present invention, even if the cutting speed is increased, the drill body 10 can be stably operated without damage, and can increase the life of the drill body 10 itself when used for a long time. have.
  • the web blade 21 is forward in front of the first and second cutting inserts 30a and 30b, that is, the drill body so that the end of the web blade 21 is stepped 32 at a predetermined interval from the cutting edge 31.
  • the cutting tip cut by the web blade 21 and the cutting tips cut by the first and second cutting inserts 30a and 30b are coupled to protrude further to a predetermined length along the direction in which the 10 is rotated.
  • the step 32 allows the chip to be easily discharged even if the area occupied by the flute 14 is not large due to being separated from each other without being continuous.
  • the web blade 21 and the cutting edge 31 are formed to be continuous as a whole, and the edges of the web blade 21 and the cutting edge 31 are formed so as to be slightly stepped by a single step 32.
  • the cutting chip is discharged to the flute 14 of the cutting, and the cutting chips cut by the web blade 21 and the cutting edge 31 are discharged separately from each other rather than continuously, and are formed in the drill body 10. Even if the flute 14 reduces the area occupied, it is possible to facilitate chip discharge. Accordingly, the cutting area for forming the flute 14 on the drill body 10 can be further reduced to increase rigidity.
  • the outer insert when the drill body 10 is rotated about the central axis, the outer insert has a limitation in adjusting the cutting angle of the inner insert, but the present invention has inserts 30a and 30b formed on both left and right sides thereof.
  • the cutting angle of the inner center drill insert 20 which receives a lot of force (cutting load) may be increased to allow smooth processing while receiving less force.
  • FIG 8 is an exploded perspective view of the insert drill according to another embodiment of the present invention
  • Figure 9 is a view showing a cross-sectional structure of the insert drill according to another embodiment of the present invention.
  • the insert drill according to another embodiment of the present invention adopts a structure in which the drill body 1000 is divided into upper and lower portions, so that the drill body 10 when the upper end of the drill body 1000 is worn or broken by cutting. No need to replace the whole part of the), just replace the upper body.
  • the drill body 1000 in another embodiment of the present invention includes an upper body 100 and a lower body 200 that are configured to be separated up and down.
  • the upper body 100 has a first insertion hole 110 is formed through the lower portion in the center of the front end, the insert seating portion 120 is formed to be symmetrical to both sides of the first insertion hole 110, the length along the outer peripheral surface Spiral first flute 140 is formed.
  • the first insertion hole 110 is a mounting jaw 111 protrudes along the inner edge of the first insertion hole 110 so that the inner diameter of the upper side of the first insertion hole 110 is larger than the inner diameter of the lower side. .
  • a first fastening hole 130 communicating with the first insertion hole 110 is formed at an outer surface of the upper body 100, and is lowered together with the first insertion hole 110 at the lower end of the upper body 100.
  • Rotational force transferring protrusion 150 is formed to protrude.
  • the lower body 200 has a fitting groove 220 corresponding to the rotational force transmission protrusion 150 formed at an upper end thereof, and the rotational force transmission protrusion 150 is inserted into the fitting groove 220 so that the upper body 100 is lower body 200.
  • Rotated integrally with) the first flute 140 'of the spiral formed on the upper body 100 is continuous downward.
  • the insertion groove 220 has a second insertion hole 210 which is in communication with the first insertion hole 110 is formed downward, the outer surface of the lower body 200 is made of the first communication hole 110 is communicated with the first insertion hole (110) Two fastening holes 230 are formed.
  • center drill insert 300 extends downwardly with the main body portion 310 in which the web blade 21 and the insertion groove 22 are formed, and thus the first insertion hole 110 and the second insertion hole 22 are formed. Further comprising an extension coupling part 320 is inserted into the drill body 1000 through the insertion hole 210.
  • the extension coupling portion 320 is formed with a diameter smaller than the diameter of the main body portion 310, stepped 311 to be seated on the seating jaw 111 between the main body portion 310 and the extension coupling portion 320 ) Is formed.
  • an evaluation ball surface 330 cut into one surface on the outer surface of the extension coupling part 320, and ends of the bolts fastened to the first fastening hole 130 and the second fastening hole 230 are each evaluation ball surface ( 330).
  • the cutting oil supply is communicated to the lower end of the second insertion hole 210 to the upper end of the center drill insert 300
  • a flow path 340 is formed, and a cutting oil supply flow path 160 communicating with the lower body 200 is formed at an upper end of the upper body 100 to supply cutting cutting power to the cutting insert 30.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

La présente invention concerne un foret à insert comprenant : un corps de foret comprenant un trou d'insertion formé au niveau du centre de l'extrémité avant de ce dernier, comprenant des parties de support d'insert formées symétriquement sur les deux côtés du trou d'insertion, et comprenant une première cannelure formée de manière hélicoïdale dans la direction longitudinale de manière à s'étendre à partir de la partie d'extrémité supérieure vers le bas le long de la surface périphérique externe ; un insert de foret central, dont la partie d'extrémité inférieure est insérée dans le trou d'insertion, l'insert de foret central étant formé de manière à faire saillie en direction de l'extrémité avant du corps de foret, comprenant des lames de voile formées symétriquement sur les deux côtés de cette dernière de sorte que la partie d'extrémité avant des lames de voile s'incline à partir de la partie centrale en direction de la partie inférieure de l'extérieur sous une forme circulaire, et l'insert de foret central comprenant des rainures d'insertion formées symétriquement sur les deux côtés de la surface externe de ce dernier, de sorte que celle-ci soit incisée dans une inclinaison d'une longueur prédéterminée à partir de la partie supérieure en direction du centre interne ; et des premier et second inserts de coupe comprenant des lames de coupe en forme d'hexaèdre formées sur les quatre surfaces des bords de surface avant de ces derniers, les premier et second inserts de coupe étant formés symétriquement sur les deux côtés de l'insert de foret central, une surface latérale des premier et second inserts de coupe étant forcée contre les rainures d'insertion tandis que la surface avant associée se dresse verticalement dans une direction correspondant à la direction longitudinale du corps de foret, et la surface inférieure des premier et second inserts de coupe adjacents à une surface latérale étant supportée sur les parties de support d'insert, les lames de bande de l'insert de foret central et les lames de coupe des premier et second inserts de coupe étant accouplées au corps de foret de manière à être continues dans l'ensemble, ainsi, pendant le fonctionnement, une sélection de position centrale est facile et la vitesse du processus de coupe est améliorée.
PCT/KR2017/007753 2016-07-27 2017-07-19 Foret à insert Ceased WO2018021753A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2016-0095126 2016-07-27
KR20160095126 2016-07-27
KR10-2017-0062045 2017-05-19
KR1020170062045A KR101825514B1 (ko) 2016-07-27 2017-05-19 절삭가공속도를 향상시킨 인서트 드릴

Publications (1)

Publication Number Publication Date
WO2018021753A1 true WO2018021753A1 (fr) 2018-02-01

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PCT/KR2017/007753 Ceased WO2018021753A1 (fr) 2016-07-27 2017-07-19 Foret à insert

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Country Link
WO (1) WO2018021753A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109044495A (zh) * 2018-08-17 2018-12-21 中南大学湘雅医院 一种螺旋形刀头机构
CN112676617A (zh) * 2021-01-20 2021-04-20 美戈利(浙江)科技有限公司 一种快速复合皇冠钻

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19507213A1 (de) * 1995-03-02 1996-09-05 Krupp Ag Hoesch Krupp Bohrer
US8376669B2 (en) * 2006-03-17 2013-02-19 Kennametal Inc. Drill, a drill assembly, and a tool head for a cutting tool
KR20130058386A (ko) * 2011-11-25 2013-06-04 윤성덕 인서트 드릴
KR20150114520A (ko) * 2013-03-06 2015-10-12 얼라이드 머신 앤드 엔지니어링 코포레이션 심공 드릴 가공 시스템
KR20160080384A (ko) * 2014-12-29 2016-07-08 한국야금 주식회사 회전공구

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19507213A1 (de) * 1995-03-02 1996-09-05 Krupp Ag Hoesch Krupp Bohrer
US8376669B2 (en) * 2006-03-17 2013-02-19 Kennametal Inc. Drill, a drill assembly, and a tool head for a cutting tool
KR20130058386A (ko) * 2011-11-25 2013-06-04 윤성덕 인서트 드릴
KR20150114520A (ko) * 2013-03-06 2015-10-12 얼라이드 머신 앤드 엔지니어링 코포레이션 심공 드릴 가공 시스템
KR20160080384A (ko) * 2014-12-29 2016-07-08 한국야금 주식회사 회전공구

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109044495A (zh) * 2018-08-17 2018-12-21 中南大学湘雅医院 一种螺旋形刀头机构
CN112676617A (zh) * 2021-01-20 2021-04-20 美戈利(浙江)科技有限公司 一种快速复合皇冠钻

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