KR20120036582A - T cutter having unequal division - Google Patents

T cutter having unequal division Download PDF

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KR20120036582A
KR20120036582A KR1020100098336A KR20100098336A KR20120036582A KR 20120036582 A KR20120036582 A KR 20120036582A KR 1020100098336 A KR1020100098336 A KR 1020100098336A KR 20100098336 A KR20100098336 A KR 20100098336A KR 20120036582 A KR20120036582 A KR 20120036582A
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South Korea
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cutter
cutting
shank
angle
shank portion
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KR1020100098336A
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Korean (ko)
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김금화
이영국
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김금화
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/003—Milling-cutters with vibration suppressing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/1054—T slot cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/20—Number of cutting edges
    • B23C2210/205—Number of cutting edges six
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/28—Arrangement of teeth
    • B23C2210/282—Unequal angles between the cutting edges, i.e. cutting edges unequally spaced in the circumferential direction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

PURPOSE: A T-cutter having an unequal division structure is provided to improve surface roughness by reducing friction during a cutting work. CONSTITUTION: A T-cutter having an unequal division structure comprises a shank unit(10) and a cutting unit(20). The shank unit has an oval end(15). The cutting unit is welded to the shank unit through an oval groove(25). The cutting unit retains unequally divided angles(31,32,33,34,35,36).

Description

부등분할 구조의 티 커터{T cutter having unequal division}T cutter having unequal division

본 발명은 부등분할 구조의 T커터에 관한 것으로서, 보다 구체적으로는 진동에 의한 가공 불량과 생크 접합부의 파손을 방지하여 절삭성능을 향상하면서 경제성을 확보하는 부등분할 구조의 T커터에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a T-cutter having an undivided structure, and more particularly, to a T-cutter having an undivided structure which improves cutting performance by preventing machining defects and breakage of the shank joint due to vibration.

통상 밀링커터는 고속도강(H.S.S)과 초경합금을 소재로 하여 원통의 외주면에 다수의 날을 배치한 절삭공구로서, 플레인 커터(plain cutter), 메탈 소요(metal saw), 측면 커터(side milling cutter), 정면 커터(face cutter), 엔드밀(end mill), 각 커터(angular cutter), 총형 커터(formed cutter), T커터 등으로 구분된다. Conventional milling cutters are cutting tools in which a number of blades are arranged on the outer circumferential surface of a cylinder made of high speed steel (HSS) and cemented carbide, and are used for plain cutters, metal saws, side milling cutters, Face cutters, end mills, angular cutters, shaped cutters, T cutters, and the like are classified.

특히 키 홈을 절삭하는 용도로 사용되는 T커터는 날 두께 공차가 까다롭고 절삭저항이 큰 편이므로 진동에 의한 가공 불량을 야기하는 것은 물론 생크를 V형으로 접합한 부분에서 파손을 유발할 우려도 높다. In particular, the T-cutter used for cutting key grooves has high blade thickness tolerances and high cutting resistance, which may cause machining failure due to vibration and also cause damage at the shank-jointed V-section. .

이와 관련되는 선행특허로 한국 공개특허공보 제1996-0021318호의 "T형홈 밀링커터"는 T형홈 밀링커터에 있어서, 3개의 칼날취부좌를 상호간 120도가 될 수 있도록 T형홈 밀링커터 본체에 설치하고 제1칼날취부좌에는 T형홈 밀링커터반에서 먼쪽을 절삭하는 제1다이아몬드형 칼날을 취부하며, 제2칼날취부좌에는 T형홈 밀링커터반에 가까운 쪽을 절삭하는 제다이아몬드형 칼날을 취부하고, 제3칼날취부좌에는 원형 또는 다각형의 제3칼날을 취부하는 구성을 제안한다. 이는 경제적인 T형홈 밀링커터를 제공하는 목적을 도모하지만 진동에 의한 가공 불량을 해소하는 설계요소를 결여하고 있다.In this related art, "T-shaped groove milling cutter" of Korean Patent Publication No. 1996-0021318 is a T-shaped groove milling cutter, and three blade mounting seats are installed on the T-shaped groove milling cutter body so as to be 120 degrees to each other. In the first blade mounting seat, a first diamond type blade that cuts away from the T-shaped groove milling cutter plate is mounted, and in the second blade mounting seat, a diamond type blade that cuts near the T-shaped groove milling cutter plate is mounted. In the three-blade mounting seat, a configuration for mounting a third blade of circular or polygonal shape is proposed. This aims to provide an economical T-groove milling cutter but lacks a design element that eliminates machining defects caused by vibration.

반면, 한국 등록특허공보 제0673555호의 "부등분할 엔드밀"에 의하면 엔드밀에 있어서, 바닥면에서부터 복수개의 날사이의 모든 분할각도를 상이하게 설정함과 동시에, 높이에 따라서 각 날의 피치가 달라지도록 각 날들의 헬리스각을 변화시켜 각 날의 분할 각도가 계속 변화될 수 있도록 구성됨을 기술적 특징으로 한다. 각각의 날의 헬릭스각도를 변화시킴과 동시에, 복수개의 날의 분할각도를 모두 상이하게 설정함으로써, 다양한 절삭환경에 적용할 수 있게 되는 구성을 제안한다. 다만, 이는 가공 불량의 해소를 기대할 수 있으나 생크를 접합하는 방식에 대한 설계요소가 결여되어 공구파손의 우려를 불식함에 미흡하다.On the other hand, according to "Equally divided end mill" of Korean Patent Publication No. 0673555, in the end mill, all the angles of division between the bottom surface and the plurality of blades are set differently, and the pitch of each blade varies according to the height. It is characterized by the fact that it is configured so that the angle of division of each blade can be changed continuously by changing the angle of hellis of each blade. By changing the helix angle of each blade and setting the split angles of a plurality of blades differently, a configuration that can be applied to various cutting environments is proposed. However, this can be expected to eliminate the machining defects, but lack of design elements for the method of joining the shank is insufficient to eliminate the fear of tool damage.

상기와 같은 종래의 문제점들을 개선하기 위해 착안되는 본명의 목적은, 진동에 의한 가공 불량과 생크 접합부의 파손을 방지하여 절삭성능을 향상하면서 경제성을 확보하는 부등분할 구조의 T커터를 제공하는 데 있다.It is an object of the present invention, which is conceived to improve the conventional problems as described above, to provide a T-cutter having an undivided structure that improves cutting performance by preventing machining defects and breakage of the shank joint due to vibration. .

상기 목적을 달성하기 위하여, 본 발명은 T커터에 있어서: 타원단을 지닌 생크부; 및 상기 생크부에 타원홈을 개재하여 접합되고, 부등 구조의 분할각을 유지하는 절삭부;를 포함하여 이루어지는 것을 특징으로 한다.In order to achieve the above object, the present invention is a T cutter: a shank portion having an ellipsoid; And a cutting part joined to the shank part via an elliptical groove to maintain a divided angle of the uneven structure.

또, 본 발명에 따르면 상기 생크부의 타원단은 장단경의 직경비를 1 : 0.96~0.94 로 유지하는 것을 특징으로 한다.In addition, according to the present invention, the elliptical end of the shank portion is characterized in that the diameter ratio of the long and short diameter is maintained at 1: 0.96 to 0.94.

또, 본 발명에 따르면 상기 절삭부의 분할각은 6날을 기준으로 58˚, 60˚, 62˚를 순차적으로 배치하는 것을 특징으로 한다.In addition, according to the present invention, the dividing angle of the cutting unit is characterized in that the 58 °, 60 °, 62 ° sequentially arranged on the basis of the six blades.

또, 본 발명에 따르면 상기 절삭부는 분할각과 동일한 비율의 범위에서 여유각을 차등적으로 유지하는 것을 특징으로 한다.In addition, according to the present invention, the cutting part is characterized in that to maintain the clearance angle differentially in the range of the same ratio as the divided angle.

이상과 같이 본 발명에 따른 부등분할 구조의 T커터에 의하면, 진동에 의한 가공 불량과 생크 접합부의 파손을 방지하여 절삭성능을 향상하면서 경제성을 확보하는 효과가 있다.As described above, according to the T-cutter having an undivided structure according to the present invention, it is possible to prevent machining defects and breakage of the shank joint due to vibration, thereby improving cutting performance and securing economical efficiency.

도 1은 본 발명에 따른 T커터를 정면에서 나타내는 구성도
도 2는 본 발명에 따른 T커터를 측면에서 나타내는 구성도1 is a configuration diagram showing a T-cutter according to the present invention from the front
Figure 2 is a block diagram showing a T cutter according to the present invention from the side

이하, 첨부된 도면에 의거하여 본 발명의 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 키 홈을 비롯한 T형홈(slot)을 절삭가공하기 위한 T커터에 관련되는 것으로, 상호 재질을 달리하는 생크부(10)와 절삭부(20)가 일체로 결합되는 구조를 지닌다. The present invention relates to a T cutter for cutting a T-shaped slot including a key groove, and has a structure in which the shank portion 10 and the cutting portion 20 having different materials are integrally coupled to each other.

본 발명에 따른 생크부(10)는 종래의 V형 탑 솔리드 대신 타원단(15)을 지닌다. 생크부(10)는 고속도강(H.S.S) 또는 이와 유사한 물성의 소재를 사용하며 일단부에서만 타원단(15)을 형성한다. 예컨대 TiN으로 코팅된 고속도 공구강(SKH2) 또는 기계구조용 탄소강(SM30C)을 사용할 수도 있다. 타원단(15)은 후술하는 절삭부(20)와 결합력을 증대하여 종래에 생크부(10)의 중간에 형성되는 V형 용접부에서 나타나는 파손 현상을 방지할 수 있다. 그리고 생크부(10)에서 고가의 초경합금 대신 고속도강이 차지하는 비율이 증가되므로 제조원가의 절감에 유리하다.The shank portion 10 according to the present invention has an elliptical end 15 instead of the conventional V-shaped top solid. The shank portion 10 uses a high-speed steel (H.S.S) or similar material and forms an elliptical end 15 only at one end. For example, high speed tool steel (SKH2) or mechanical structural carbon steel (SM30C) coated with TiN may be used. The ellipsoidal end 15 may increase the bonding force with the cutting part 20 to be described later to prevent a breakage phenomenon occurring in the V-shaped weld part formed in the middle of the shank part 10. In addition, since the ratio of high speed steel to the shank portion 10 instead of expensive cemented carbide is increased, it is advantageous to reduce manufacturing costs.

이때, 상기 생크부(10)의 타원단(15)은 장단경의 직경비를 1 : 0.96~0.94 로 유지하는 것이 좋다. 타원단(15)의 장경과 단경의 비율에 따른 성능은 반복 실험에 의하여 결정된다. 타원단(15)의 직경비가 0.96을 초과하면 진원에 가까워지므로 생크부(10)와 절삭부(20)와의 결합력이 약화되고, 0.94보다 작아지면 성형성이 다소 불량해지고 가공시 동적 언밸런스를 유발하기 쉽다. At this time, the elliptical end 15 of the shank portion 10 may maintain the diameter ratio of the long and short diameter of 1: 0.96 ~ 0.94. The performance according to the ratio of the long diameter to the short diameter of the elliptic end 15 is determined by the repeated experiments. If the diameter ratio of the elliptic end 15 is greater than 0.96, it becomes close to the roundness, and thus, the coupling force between the shank portion 10 and the cutting portion 20 is weakened. easy.

한편, 도시에는 타원단(15)과 타원홈(25)이 단일의 타원형으로 구성된 것으로 나타내지만 2개의 타원형을 직교하도록 배치하는 네잎크로버형 구성도 가능하다. 이 경우 형상이 복잡화되어 성형성은 다소 저하되지만 절삭가공시 다이내믹 밸런스를 유지하여 진동을 저감하는데 유리하다.On the other hand, the ellipse end 15 and the elliptical groove 25 is shown as being composed of a single oval in the city, but four-leaf clover-type configuration is also possible to arrange the two oval orthogonal. In this case, the shape is complicated and the moldability is somewhat reduced, but it is advantageous to maintain the dynamic balance during cutting to reduce vibration.

또, 본 발명에 따르면 부등 구조의 분할각(31~36)을 유지하는 절삭부(20)가 상기 생크부(10)에 타원홈(25)을 개재하여 접합된다. 절삭부(20)는 초경합금 또는 이와 유사한 물성의 소재를 사용하며 중앙에 타원홈(25)을 지닌다. 타원홈(25)은 타원단(15)과 함께 억지 끼워맞춤의 공차를 유지하며, 상호 맞물려 결합한 후에 용접을 부가하는 것이 좋다. 생크부(10)에서 타원단(15)이 형성되는 길이는 절삭부(20)의 두께에 최대한 근접하도록 한다.In addition, according to the present invention, the cutting portion 20 for maintaining the divided angles 31 to 36 of the uneven structure is joined to the shank portion 10 through the elliptical groove 25. The cutting part 20 uses a cemented carbide or similar material and has an elliptical groove 25 in the center thereof. The elliptical groove 25 maintains the tolerance of the interference fit with the elliptical end 15, and it is preferable to add the weld after engaging with each other. The length of the elliptical end 15 formed in the shank portion 10 is to be as close as possible to the thickness of the cutting portion (20).

이때, 상기 절삭부(20)의 분할각(31~36)은 6날을 기준으로 58˚, 60˚, 62˚를 순차적으로 배치한다. 분할각(31~36)에서 대향하는 부분은 상호 동일한 각도가 유지되므로 다이내믹 밸런스의 유지도 가능하다. 분할각(31~36)의 기준치가 58˚~ 62˚ 범위를 벗어나는 경우 자체의 언밸런스가 유발되어 치수 정밀도와 표면조도를 확보하기 곤란한 것은 물론 인선의 손상도 초래되는 것으로 나타난다. 절삭부(20)의 모든 날의 인선은 동일한 헬리컬 각도를 형성한다. In this case, the divided angles 31 to 36 of the cutting unit 20 sequentially arrange 58 °, 60 °, and 62 ° based on the six blades. The opposing portions of the dividing angles 31 to 36 are maintained at the same angle with each other, so that the dynamic balance can be maintained. If the reference value of the dividing angle (31 ~ 36) is out of the 58 ~ 62 ° range is caused unbalance itself, it is difficult to secure the dimensional accuracy and surface roughness, as well as damage of the edge. The edges of all the edges of the cutting section 20 form the same helical angle.

한편, 상기 절삭부(20)는 분할각(31~36)과 동일한 비율의 범위에서 여유각(38)을 차등적으로 유지할 수도 있다. 분할각(31~36)이 58˚~ 62˚의 범위로 배치되는 것처럼 각 날의 여유각(clearance angle)(38)도 규칙적으로 반복되도록 배치한다. 이와 같은 여유각(38)으로 구성하는 경우 절삭작업시 마찰을 줄여 원활한 표면조도가 향상되도록 한다. 도시에는 생략되나 각 날에 있어서 경사각(rake angle)과 챔퍼각은 모두 동일하게 형성한다.On the other hand, the cutting unit 20 may differentially maintain the clearance angle 38 in the same ratio range as the divided angles 31 to 36. Just as the dividing angles 31 to 36 are arranged in the range of 58 to 62 degrees, the clearance angle 38 of each blade is also arranged to be regularly repeated. In the case of such a clearance angle 38 to reduce the friction during the cutting operation to improve the smooth surface roughness. Although not shown, the rake angle and the chamfer angle are the same in each blade.

본 발명은 기재된 실시예에 한정되는 것은 아니고, 본 발명의 사상 및 범위를 벗어나지 않고 다양하게 수정 및 변형할 수 있음은 이 기술의 분야에서 통상의 지식을 가진 자에게 자명하다. 따라서 그러한 변형예 또는 수정예들은 본 발명의 특허청구범위에 속한다 해야 할 것이다.It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

10: 생크부 15: 타원단
20: 절삭부 25: 타원홈
31~36: 분할각 38: 여유각10: shank portion 15: oval
20: cutting portion 25: elliptical groove
31 ~ 36: division angle 38: clearance angle

Claims (4)

T커터에 있어서:
타원단(15)을 지닌 생크부(10); 및
상기 생크부(10)에 타원홈(25)을 개재하여 접합되고, 부등 구조의 분할각(31~36)을 유지하는 절삭부(20);를 포함하여 이루어지는 것을 특징으로 하는 부등분할 구조의 T커터.For T cutters:
Shank portion 10 having an ellipsoidal fabric 15; And
T of an inequality divided structure, characterized in that it comprises a; cutting portion 20 is joined to the shank portion (10) via an elliptical groove (25) to maintain the divided angles 31 to 36 of the uneven structure. cutter. 제1항에 있어서,
상기 생크부(10)의 타원단(15)은 장단경의 직경비를 1 : 0.96~0.94 로 유지하는 것을 특징으로 하는 부등분할 구조의 T커터.The method of claim 1,
The elliptical end (15) of the shank portion (10) is a T-cutter having an inequality structure, characterized in that the diameter ratio of the long and short diameter is 1: 0.96 to 0.94. 제1항에 있어서,
상기 절삭부(20)의 분할각(31~36)은 6날을 기준으로 58˚, 60˚, 62˚를 순차적으로 배치하는 것을 특징으로 하는 부등분할 구조의 T커터.The method of claim 1,
Dividing angle (31 ~ 36) of the cutting portion 20 is a cutter of an inequality divided structure, characterized in that sequentially arranged 58 °, 60 °, 62 ° based on the six blades. 제1항에 있어서,
상기 절삭부(20)는 분할각(31~36)과 동일한 비율의 범위에서 여유각(38)을 차등적으로 유지하는 것을 특징으로 하는 부등분할 구조의 T커터.The method of claim 1,
The cutting unit 20 is a T-cutter having an inequality structure, characterized in that to differentially maintain the clearance angle 38 in the same ratio range as the dividing angle (31 ~ 36).
KR1020100098336A 2010-10-08 2010-10-08 T cutter having unequal division KR20120036582A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160086551A (en) 2015-01-12 2016-07-20 (주)케이씨티 a end mill for complex machining

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160086551A (en) 2015-01-12 2016-07-20 (주)케이씨티 a end mill for complex machining

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