KR101000863B1 - Twist dril - Google Patents

Twist dril Download PDF

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Publication number
KR101000863B1
KR101000863B1 KR1020090114302A KR20090114302A KR101000863B1 KR 101000863 B1 KR101000863 B1 KR 101000863B1 KR 1020090114302 A KR1020090114302 A KR 1020090114302A KR 20090114302 A KR20090114302 A KR 20090114302A KR 101000863 B1 KR101000863 B1 KR 101000863B1
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South Korea
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cutting edge
main
auxiliary
cutting
cutting edges
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KR1020090114302A
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Korean (ko)
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박주석
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마팔에이치티티주식회사
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/08—Side or plan views of cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/24—Overall form of drilling tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/28—Arrangement of teeth

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

Abstract

PURPOSE: A twist drill is provided to increase the transfer speed of cutting chips and smoothly discharge the cutting chip by distributing the cutting torque of cutting edges. CONSTITUTION: A twist drill comprises two main cutting edges(12) which are extended from a central web cutting edge(11), and two sub cutting edges(15) which are arranged between the main cutting edges. A main flute(14) is formed between the flanks(16) of the main and sub cutting edges. A sub flute(17) is formed between the flanks(13) of the main and sub cutting edges. A grooves(18) is formed between each sub cutting edge and the center.

Description

트위스트 드릴{TWIST DRIL}Twist drill {TWIST DRIL}

본 발명은 비교적 경도가 작은 주물, 알루미늄 합금, 구리합금 등의 피삭재를 천공하는 트위스트 드릴에 관한 것으로서, 보다 상세하게는 4개의 절삭날이 형성되는 트위스트 드릴에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to twist drills for drilling workpieces of relatively small hardness, aluminum alloys, copper alloys, and the like, and more particularly to twist drills in which four cutting edges are formed.

대한민국 공개특허 제 10-2009-0082528호(2009년07월31일, 공개)에 "난삭재의 고속가공용 트위스트 드릴 리머"가 소개되어 있다. Korean Unexamined Patent Publication No. 10-2009-0082528 (published on July 31, 2009) introduces a "twist drill reamer for high-speed machining of hard materials."

상기 난삭재의 고속가공용 트위스트 드릴 리머는 선단에 마진을 가지지 않는 한쌍의 주절삭날을 가지며, 외주 부분에는 2쌍의 제2 절삭날과 제 3 절삭날을 설치하고, 제 2 절삭날의 마진은 0.4∼0.6mm의 범위이며, 제3 절삭날의 마진은 0.6∼0.7mm의 범위이고, 주절삭날의 선단부 외경에 비하여 제2 절삭날과 제 3 절삭날의 선단부 외경을 0.02∼0.06mm 크도록 하며, 주절삭날에 평행으로서 트위스트 드릴 리머의 중심을 통하는 중심선과 주절삭날과의 이루는 폭은 0.078∼0.082D의 범위로 하며, 선단부로부터 축방향으로 이어지는 절삭칩 배출용의 비틀림홈의 비틀림각을 28도에서 30도의 범위로 형성함과 동시에, 랜드폭과 홈폭과의 홈폭비를 1 : 0.9∼1.1의 범위로 하며, 주절삭날과 제2 절삭날 및 제3 절삭날의 경사각은 -10∼-15도의 범위로 하며, 여유각은 9∼11도의 범위를 가지고, 선단각은 135∼145도의 범위로 하며, 치즐날폭은 0.025∼0.035D의 범위를 가지고, 치즐날각은 120도∼130도의 범위이며, 시닝 절삭날각은 150∼160도의 범위를 가지고, 웨브폭은 0.29∼0.31D의 범위이며, 트위스트 드릴 리머의 축방향 길이를 L이라 할 때, 섕크측을 향한 절삭날의 백테이퍼는 (0.04∼0.1)/100L의 범위이며, 섕크 측을 향한 웨브 테이퍼는 (0.9∼1.1)/100L의 범위이고, TiAlN 코팅이 실시된 것을 특징으로 한다.The twist drill reamer for high-speed machining of the hard cutting material has a pair of main cutting edges having no margin at the tip, and two pairs of the second cutting edge and the third cutting edge are installed at the outer peripheral portion, and the margin of the second cutting edge is 0.4. It is in the range of ˜0.6 mm, and the margin of the third cutting edge is in the range of 0.6 to 0.7 mm, and the outer diameters of the leading edges of the second cutting edge and the third cutting edge are 0.02 to 0.06 mm larger than the outer diameter of the leading edge of the main cutting edge. Parallel to the main cutting edge, the width between the centerline through the center of the twist drill reamer and the main cutting blade is in the range of 0.078 to 0.082D, and the torsion angle of the torsion groove for discharging the cutting chip extending in the axial direction from the distal end. The groove width ratio between the land width and the groove width is set in the range of 1: 0.9 to 1.1, and the inclination angles of the main cutting edge, the second cutting edge, and the third cutting edge are -10 to 30 degrees. It is in the range of -15 degrees and the clearance angle is in the range of 9 to 11 degrees. The tip angle is in the range of 135 to 145 degrees, the chisel blade width is in the range of 0.025 to 0.035D, the chisel blade angle is in the range of 120 degrees to 130 degrees, and the thinning cutting edge is in the range of 150 to 160 degrees. The width is in the range of 0.29 to 0.31D, and when the axial length of the twist drill reamer is L, the back taper of the cutting edge toward the shank side is in the range of (0.04 to 0.1) / 100L, and the web taper toward the shank side Is in the range of (0.9 to 1.1) / 100L, and TiAlN coating is performed.

그러나, 상기의 난삭재의 고속가공용 트위스트 드릴 리머는 3쌍의 절삭날을 가지지만 주절삭날 2날만 드릴의 이송역할을 하고, 제 2 절삭날 및 제 3 절삭날은 주절삭날보다 크게 제작되어 주절삭날에서 가공된 구멍의 내벽을 정밀하게 다듬질하는 역할을 하고, 만약, 제 2 절삭날과 제 3 절삭날이 드릴의 이송역할을 하게 되면 드릴 리머의 절삭이 이루어지지 않는 구간에서 피삭재와 접촉하여 드릴이 파손되는 문제가 있다. However, the above-mentioned twist drill reamer for high-speed machining of the hard cutting material has three pairs of cutting edges, but only the two main cutting edges feed the drill, and the second and third cutting edges are made larger than the main cutting edges. The inner wall of the hole machined in the cutting edge is precisely trimmed, and if the second cutting edge and the third cutting edge serve as the feed of the drill, the cutting reamer contacts the workpiece in the section where the cutting of the drill reamer is not made. There is a problem that the drill is broken.

따라서, 본 발명의 목적은 2개의 절삭날을 추가하여 선단부에 4개의 절삭날을 형성됨으로써, 절삭날이 편심지게 회전하는 현상을 방지하고, 절삭날의 절삭토크를 분산하여 이송속도가 증가되고, 칩 배출이 원활하게 이루어질 수 있는 트위스트 드릴을 제공하는 것이다.Accordingly, an object of the present invention is to add two cutting edges to form four cutting edges at the tip, thereby preventing the cutting edge from rotating eccentrically, dispersing the cutting torque of the cutting edge to increase the feed rate, It is to provide a twist drill that can smoothly discharge chips.

상기 목적을 달성하기 위한 본 발명에 따른 트위스트 드릴은 선단에 2개의 주 절삭날과 2개의 보조 절삭날이 형성되도록, 센터에 형성된 웨브절삭날에서 2개의 주 절삭날이 각각 연장되고, 2개의 주 절삭날 사이에 2개의 보조 절삭날이 각각 배치되고, 주 절삭날과 보조 절삭날의 여유각면 사이에 메인 플루트가 형성되고, 보조 절삭날과 주 절삭날의 여유각면 사이에 보조 플루트가 형성되고, 보조 절삭날의 길이가 드릴 반경의 0.4배이고, 보조 절삭날과 센터 사이에 요홈부가 형성되는 것을 특징으로 한다.The twist drill according to the present invention for achieving the above object has two main cutting edges each extending from a web cutting edge formed in the center so that two main cutting edges and two auxiliary cutting edges are formed at the tip, Two auxiliary cutting edges are respectively disposed between the cutting edges, a main flute is formed between the main cutting edge and the spare angle of the auxiliary cutting edge, and an auxiliary flute is formed between the auxiliary cutting edge and the spare angle of the main cutting edge, The length of the auxiliary cutting edge is 0.4 times the drill radius, characterized in that the groove is formed between the auxiliary cutting edge and the center.

상기 주 절삭날(12)과 보조 절삭날(15)은 2개의 주절삭날(12 ; 12a, 12b) 사이에 보조 절삭날(15; 15a, 15b)이 배치되어, 어느 한 주절삭날(15a)이 0도 위치에 배치되고, 다른 주절삭날(15b)이 180도 위치에 위치될 때, 어느 한 보조 절삭날(15a)이 65~70도 위치에 배치되고, 다른 보조 절삭날(15b)이 245~250도 위치에 배치되는 것을 특징으로 한다.In the main cutting edge 12 and the auxiliary cutting edge 15, the auxiliary cutting edges 15; 15a and 15b are disposed between the two main cutting edges 12; 12a and 12b, and any one of the main cutting edges 15a. ) Is disposed at the 0 degree position, when the other major cutting edge 15b is positioned at the 180 degree position, any one auxiliary cutting edge 15a is disposed at the 65 to 70 degree position, and the other auxiliary cutting edge 15b It is characterized in that it is disposed at the position of 245 ~ 250 degrees.

이것에 의해, 본 발명에 따른 트위스트 드릴은 2개의 주절삭날 사이에 2개의 보조 절삭날이 형성되어, 절삭날에 걸리는 절삭토크를 분산할 수 있어, 드릴의 천공속도를 높일 수 있고, 보조 절삭날이 칩 브레이커 역할을 하고 보조 플루트가 형성되어, 칩 배출이 원활하게 이루어지는 효과가 있다. As a result, in the twist drill according to the present invention, two auxiliary cutting edges are formed between the two main cutting edges, the cutting torque applied to the cutting edges can be dispersed, the drilling speed of the drill can be increased, and the auxiliary cutting The blade acts as a chip breaker and an auxiliary flute is formed, so that the chip is discharged smoothly.

이하, 본 발명에 따른 바람직한 실시예를 도면을 참조하여 상세하게 설명하기로 한다. 주 절삭날, 보조 절삭날, 플루트 등의 구성요소이 대칭적으로 2개가 형성되어 있어, 설명의 편의상 어느 하나에만 도면부호를 붙여 설명하기로 한다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Since two components, such as a main cutting edge, an auxiliary cutting edge, and a flute, are formed symmetrically, it will be described with reference to only one for convenience of description.

도 1 내지 도 3을 참조하면, 본 발명에 따른 트위스트 드릴은 선단에 2개의 주 절삭날(12)과 2개의 보조 절삭날(15)이 형성되도록, 센터에 형성된 웨브절삭날(11)에서 2개의 주 절삭날(12)이 각각 연장되고, 2개의 주 절삭날(12) 사이에 2개의 보조 절삭날(15)이 각각 배치되고, 주 절삭날(12)과 보조 절삭날(15)의 여유각면(16) 사이에 메인 플루트(14)가 형성되고, 보조 절삭날(15)과 주 절삭날(12)의 여유각면(13) 사이에 보조 플루트(17)가 형성되고, 보조 절삭날(15)의 길이(d1)가 드릴 반경(r)의 0.4배이고, 보조 절삭날(15)과 센터(O1) 사이에 요홈부(18)가 형성된다.1 to 3, the twist drill according to the present invention has two ends at a web cutting edge 11 formed at the center such that two main cutting edges 12 and two auxiliary cutting edges 15 are formed at the tip. Two main cutting edges 12 respectively extend, and two auxiliary cutting edges 15 are disposed between the two main cutting edges 12, respectively, and the clearance of the main cutting edge 12 and the auxiliary cutting edges 15 is reduced. The main flute 14 is formed between each surface 16, the auxiliary flute 17 is formed between the auxiliary cutting edge 15 and the clearance angle surface 13 of the main cutting edge 12, and the auxiliary cutting edge 15 Length d1) is 0.4 times the drill radius r, and the recessed portion 18 is formed between the auxiliary cutting edge 15 and the center O1.

위에서 미설명한 도면부호 20은 절삭유 구멍이다.Reference numeral 20 not described above is a coolant hole.

상기 보조 플루트홈(17)는 그 폭이 메인 플루트(14) 폭의 1/2로 형성된다. The auxiliary flute groove 17 has a width that is 1/2 of the width of the main flute 14.

상기 주 절삭날(12)과 보조 절삭날(15)은 2개의 주절삭날(12 ; 12a, 12b) 사이에 보조 절삭날(15; 15a, 15b)이 배치되어, 어느 한 주절삭날(15a)이 0도 위치에 배치되고, 다른 주절삭날(15b)이 180도 위치에 위치될 때, 어느 한 보조 절삭날(15a)이 65~70도 위치에 배치되고, 다른 보조 절삭날(15b)이 245~250도 위치에 배치된다.In the main cutting edge 12 and the auxiliary cutting edge 15, the auxiliary cutting edges 15; 15a and 15b are disposed between the two main cutting edges 12; 12a and 12b, and any one of the main cutting edges 15a. ) Is disposed at the 0 degree position, when the other major cutting edge 15b is positioned at the 180 degree position, any one auxiliary cutting edge 15a is disposed at the 65 to 70 degree position, and the other auxiliary cutting edge 15b This 245-250 degree is arrange | positioned.

상기와 같이 구성된 본 발명에 따른 트위스트 드릴은 다음과 같은 특징이 있 다.Twist drill according to the present invention configured as described above has the following features.

일반적으로, 중심에서 외주면 사이의 거리를 반경 r 이라고 할 때, 중심의 0.6r 지점에서 외주면 사이에 걸리는 절삭토크는 중심에서 0.6r 지점 사이에 걸리는 절삭토크의 1.8배이다. 따라서, 본 발명에서와 같이 0.6r 지점에서 외주면 사이에 보조 절삭날(15)을 형성하여, 2개의 보조 절삭날(15)을 주 절삭날(12) 사이에 배치하면, 주 절삭날(12)의 절삭토크가 보조 절삭날(15)로 분산되는 효과가 있어, 주 절삭날(12)의 걸리는 부하가 감소되어, 드릴의 이송속도(천공속도)가 증가된다.In general, when the distance from the center to the outer circumferential surface is referred to as the radius r, the cutting torque that is applied between the outer circumferential surface at the 0.6r point of the center is 1.8 times the cutting torque that is applied between the 0.6r point at the center. Therefore, when the auxiliary cutting edge 15 is formed between the outer circumferential surface at the point 0.6r as in the present invention, and the two auxiliary cutting edges 15 are disposed between the main cutting edges 12, the main cutting edge 12 Cutting torque is distributed to the auxiliary cutting edge 15, the load applied to the main cutting edge 12 is reduced, and the feed speed (drilling speed) of the drill is increased.

그리고, 보조 플루트(17)의 폭이 메인 플루트(14)의 폭보다 1/2로 작지만, 보조 절삭날(15)의 길이가 반경의 0.4배 정도로 짧아 칩 생성이 최소화되고, 칩을 끊어 주는 칩 브레이커 역할을 하여 칩 배출을 원활하게 할 수 있다. In addition, although the width of the auxiliary flute 17 is 1/2 smaller than the width of the main flute 14, the length of the auxiliary cutting edge 15 is about 0.4 times the radius, so that chip generation is minimized and the chip is cut off. Can act as a breaker to facilitate chip evacuation.

또한, 보조 절삭날(15)과 센터(O1) 사이에 요홈부(18)가 형성되어, 절삭날이 없는 센터에서 0.6r 지점이 피삭재와의 접촉되는 것을 방지함으로써, 드릴이 파손되는 것을 방지하게 된다.In addition, a recessed portion 18 is formed between the auxiliary cutting edge 15 and the center O1 to prevent the drill from being broken by preventing the 0.6r point from contacting the workpiece with the cutting edgeless center. do.

도 1은 본 발명에 따른 트위스트 드릴을 도시한 사시도1 is a perspective view showing a twist drill according to the present invention

도 2 및 도 3은 본 발명에 따른 트위스트 드릴을 도시한 평면도 2 and 3 are plan views showing twist drills according to the present invention.

Claims (2)

선단에 2개의 주 절삭날(12)과 2개의 보조 절삭날(15)이 형성되도록, 센터에 형성된 웨브절삭날(11)에서 2개의 주 절삭날(12)이 각각 연장되고, 2개의 주 절삭날(12) 사이에 2개의 보조 절삭날(15)이 각각 배치되고, 주 절삭날(12)과 보조 절삭날(15)의 여유각면(16) 사이에 메인 플루트(14)가 형성되고, 보조 절삭날(15)과 주 절삭날(12)의 여유각면(13) 사이에 보조 플루트(17)가 형성되고, 보조 절삭날(15)의 길이(d1)가 드릴 반경(r)의 0.4배이고, 보조 절삭날(15)과 센터(O1) 사이에 요홈부(18)가 형성되는 것을 특징으로 하는 트위스트 드릴.Two main cutting edges 12 extend from the web cutting edge 11 formed in the center so that two main cutting edges 12 and two auxiliary cutting edges 15 are formed at the tip, respectively, Two auxiliary cutting edges 15 are respectively disposed between the edges 12, and a main flute 14 is formed between the main cutting edge 12 and the angular face 16 of the auxiliary cutting edge 15, An auxiliary flute 17 is formed between the cutting edge 15 and the clearance angle face 13 of the main cutting edge 12, the length d1 of the auxiliary cutting edge 15 is 0.4 times the drill radius r, Twist drill, characterized in that the recessed portion (18) is formed between the auxiliary cutting edge (15) and the center (O1). 제 1 항에 있어서,The method of claim 1, 상기 주 절삭날(12)과 보조 절삭날(15)은 2개의 주절삭날(12 ; 12a, 12b) 사이에 보조 절삭날(15; 15a, 15b)이 배치되어, 어느 한 주절삭날(15a)이 0도 위치에 배치되고, 다른 주절삭날(15b)이 180도 위치에 위치될 때, 어느 한 보조 절삭날(15a)이 65~70도 위치에 배치되고, 다른 보조 절삭날(15b)이 245~250도 위치에 배치되는 것을 특징으로 하는 트위스트 드릴.In the main cutting edge 12 and the auxiliary cutting edge 15, the auxiliary cutting edges 15; 15a and 15b are disposed between the two main cutting edges 12; 12a and 12b, and any one of the main cutting edges 15a. ) Is disposed at the 0 degree position, when the other major cutting edge 15b is positioned at the 180 degree position, any one auxiliary cutting edge 15a is disposed at the 65 to 70 degree position, and the other auxiliary cutting edge 15b The twist drill which is arrange | positioned at this 245-250 degree position.
KR1020090114302A 2009-11-25 2009-11-25 Twist dril KR101000863B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020204035A1 (en) 2020-03-27 2021-09-30 Kennametal Inc. drill
KR20220010343A (en) 2020-07-17 2022-01-25 한국야금 주식회사 Drill for cfrp machining

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000079509A (en) * 1998-09-02 2000-03-21 Toshiba Tungaloy Co Ltd Twist drill

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000079509A (en) * 1998-09-02 2000-03-21 Toshiba Tungaloy Co Ltd Twist drill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020204035A1 (en) 2020-03-27 2021-09-30 Kennametal Inc. drill
US11819931B2 (en) 2020-03-27 2023-11-21 Kennametal Inc. Drill
KR20220010343A (en) 2020-07-17 2022-01-25 한국야금 주식회사 Drill for cfrp machining

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