TWI768945B - Extended range anti-vibration tool - Google Patents

Extended range anti-vibration tool Download PDF

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Publication number
TWI768945B
TWI768945B TW110120051A TW110120051A TWI768945B TW I768945 B TWI768945 B TW I768945B TW 110120051 A TW110120051 A TW 110120051A TW 110120051 A TW110120051 A TW 110120051A TW I768945 B TWI768945 B TW I768945B
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Taiwan
Prior art keywords
rod
head member
adapter
extended
shock absorber
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TW110120051A
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Chinese (zh)
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TW202247923A (en
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林國棋
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艋庫拉制震股份有限公司
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Publication of TW202247923A publication Critical patent/TW202247923A/en

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Abstract

一種增程抗震刀具，包括：一個轉接部與一個桿，該桿結合在轉接部的一個偏心位置；一個頭構件與桿相連，該頭構件成為桿的端部；一個刀片能拆卸地安裝於頭構件上；以及，一個減震器設在桿的內部。所述的刀具以偏心的桿延伸頭構件到轉接部的距離，相對增加刀片的加工行程，有效解決先前技術的短行程弊端。同時，該減震器在桿的內部，抗衡震顫的動能，兼具減少震顫的效果。 An extended-range anti-vibration tool, comprising: an adapter and a rod, the rod is combined at an eccentric position of the adapter; a head member is connected with the rod, and the head member becomes the end of the rod; a blade can be detachably installed on the head member; and, a shock absorber provided inside the rod. The tool uses an eccentric rod to extend the distance from the head member to the adapter portion, which relatively increases the machining stroke of the blade, effectively solving the short-stroke drawback of the prior art. At the same time, the shock absorber is inside the rod, which counteracts the kinetic energy of the vibration and has the effect of reducing the vibration.

Description

增程抗震刀具 Extended range anti-vibration tool

本發明涉及材料的加工技術，特別是指一種刀具，兼具加工行程的增長以及振動的抗衡效果。 The present invention relates to material processing technology, in particular to a tool, which has both the increase of the processing stroke and the anti-vibration effect.

已知的加工技術，通常是根據要求，將材料製成所需元件的形狀和尺寸，譬如外徑加工、內徑加工等。 Known machining techniques, such as outer diameter machining, inner diameter machining, etc., are generally required to make the material into the shape and size of the desired component.

此處所稱的外徑加工，是指一個工件外表的切削作業，譬如拋光、壓花、銑溝等加工。 The outer diameter machining referred to here refers to the cutting operations on the surface of a workpiece, such as polishing, embossing, and milling.

此處所稱的內徑加工，泛指工件內側的切削作業，如深孔、異徑、彈體(或稱曲面)等加工。 The inner diameter processing referred to here generally refers to the cutting operations on the inner side of the workpiece, such as the processing of deep holes, reducing diameters, and projectiles (or curved surfaces).

如第7圖所示，一把刀具10b由一個刀桿30結合一個第一頭部16組成。當工件40沿著一個轉動方向41自轉，該刀桿30順著一個切削方向10a位移，驅使第一頭部16的一個刀片18對工件40內部的一個大直徑孔42與一個小直徑孔43執行異徑加工作業。此處所稱的異徑，是指工件40內部不同直徑的多個孔洞。 As shown in FIG. 7 , a tool 10b is composed of a tool shank 30 combined with a first head 16 . When the workpiece 40 rotates along a rotation direction 41, the tool shank 30 is displaced along a cutting direction 10a, and drives a blade 18 of the first head 16 to execute a large-diameter hole 42 and a small-diameter hole 43 inside the workpiece 40. Different diameter machining operations. The different diameters referred to here refer to a plurality of holes with different diameters inside the workpiece 40 .

因為刀桿30的直徑大於第一頭部16的直徑，卻小於大直徑孔42的直徑，所以工件40圍成大直徑孔42的壁對刀桿30產生阻擋作用，相對縮減刀片18切削小直徑孔43的深度。換句話說，該大直徑孔42的深度，限制刀片18執行異徑加工的行程。 Because the diameter of the tool shank 30 is larger than the diameter of the first head 16, but smaller than the diameter of the large-diameter hole 42, the wall of the workpiece 40 enclosing the large-diameter hole 42 has a blocking effect on the tool shank 30, and the relatively reduced blade 18 cuts the small diameter Depth of hole 43. In other words, the depth of the large-diameter hole 42 limits the stroke of the insert 18 for performing the reducing process.

在第8圖中，該刀桿30結合一個第二頭部16a，共同組成新的刀具10b。該工件40仍舊依轉動方向41自轉，該刀桿30順著切削方向10a位移，驅使第二頭部16a的刀片18在工件40完成彈體加工作業。由於刀桿30可能碰觸工件40，縮減彈體加工的行程。 In Fig. 8, the tool shank 30 is combined with a second head 16a to form a new tool 10b. The workpiece 40 still rotates according to the rotation direction 41 , and the tool shank 30 is displaced along the cutting direction 10 a to drive the blade 18 of the second head 16 a to complete the projectile machining operation on the workpiece 40 . Since the tool bar 30 may touch the workpiece 40, the stroke of the projectile processing is reduced.

此處所稱的彈體，泛指刀片18在工件40內部切削一個宛如橢圓形的曲面44。 The projectile referred to here generally means that the blade 18 cuts an elliptical curved surface 44 inside the workpiece 40 .

因此，如何改善刀具(內徑)的加工行程，就成為本發明亟待解決的課題。 Therefore, how to improve the machining stroke of the tool (inner diameter) has become an urgent problem to be solved by the present invention.

鑒於此，本案發明人提供新的刀具，其主要目的在於：採用偏心式延伸結構，增加內徑加工的行程，兼具減少震顫的效果，有效解決先前技術的短行程弊端。 In view of this, the inventor of the present application provides a new tool, the main purpose of which is to adopt an eccentric extension structure, increase the stroke of inner diameter machining, and also have the effect of reducing chatter, and effectively solve the short stroke drawback of the prior art.

源於上述目的之達成，本發明的刀具包括：一個轉接部與一個桿，該桿結合在轉接部的一個偏心位置；一個頭構件與桿相連，該頭構件成為桿的端部；一個刀片能拆卸地安裝於頭構件上；以及，一個減震器設在桿的內部。 In order to achieve the above objects, the tool of the present invention comprises: an adapter and a rod, the rod is combined at an eccentric position of the adapter; a head member is connected to the rod, and the head member becomes the end of the rod; a The blade is removably mounted on the head member; and, a shock absorber is provided inside the rod.

如此，本發明以偏心的桿延伸頭構件到轉接部的距離，相對增加刀片的加工行程，有效解決先前技術的短行程弊端。同時，該減震器在桿的內部，抗衡震顫的動能，兼具減少震顫的效果。 In this way, the present invention uses the eccentric rod to extend the distance from the head member to the adapter portion, which relatively increases the machining stroke of the blade, effectively solving the short stroke drawback of the prior art. At the same time, the shock absorber is inside the rod, which counteracts the kinetic energy of the vibration and has the effect of reducing the vibration.

為使本發明之目的、構造、特徵和優點，淺顯易懂，茲舉一個或以上較佳的實施例，配合所附的圖式詳細說明如下。 In order to make the objects, structures, features and advantages of the present invention easy to understand, one or more preferred embodiments are presented and described in detail as follows in conjunction with the accompanying drawings.

《先前技術》 "Previous Technology"

10a:切削方向 10a: Cutting direction

10b:刀具 10b: Knives

16:第一頭部 16: First Head

16a:第二頭部 16a: Second head

18:刀片 18: Blades

30:刀桿 30: Tool holder

40:工件 40: Workpiece

41:轉動方向 41: Rotation direction

42:大直徑孔 42: Large diameter hole

43:小直徑孔 43: Small diameter hole

44:曲面 44: Surface

《本發明》 "this invention"

10:刀具 10: Knives

11:轉接部 11: transfer part

11a:中心線 11a: Centerline

11b:距離 11b: Distance

12、16b:孔 12, 16b: hole

13、13a:緊固件 13, 13a: Fasteners

14:桿 14: Rod

14a:槽 14a: Slot

14b:內螺紋 14b: Internal thread

14c:軸心線 14c: axis line

15:頭構件 15: Head Components

17:蓋體 17: Cover

17a:片體 17a: sheet body

20:減震器 20: Shock absorber

21:外螺紋 21: External thread

22:端面 22: End face

23:溝 23: Ditch

31:刀座 31: Knife holder

34:機械設備 34: Mechanical Equipment

第1圖是本發明刀具較佳的實施例。 Figure 1 is a preferred embodiment of the tool of the present invention.

第2圖是本實施例局部分解的刀具。 Fig. 2 is a partially exploded cutter of this embodiment.

第3圖順著軸心線觀看桿的端面。 Figure 3 looks at the end face of the rod along the axis.

第4圖是機械設備安裝延長的刀具。 Figure 4 shows the extended tool installed on the machine.

第5圖繪製異徑加工的刀具使用狀態。 Figure 5 shows the tool usage status for different diameter machining.

第6圖描繪彈體加工的刀具使用狀態。 Figure 6 depicts the use of the tool for projectile machining.

第7圖從剖視角度觀察先前技術的刀具執行異徑加工。 Figure 7 is a cross-sectional view of a prior art tool performing reducing machining.

第8圖從剖視角度觀察先前技術的刀具進行彈體加工。 Figure 8 is a cross-sectional view of a prior art tool for projectile machining.

如第1圖所示，本發明一種刀具10較佳的實施例包括：一個轉接部11、一個桿14、一個頭構件15與一個刀片18，該刀片18能拆卸地安裝於頭構件15上。該桿14連接頭構件15，該頭構件15成為桿14的端部。該頭構件15由一個第一頭部16與一個蓋體17組成，該第一頭部16安裝刀片18而能拆卸。一組緊固件13a穿過第一頭部16的一組孔16b，該緊固件13a是一根螺栓，該螺栓鎖緊蓋體17，使第一頭部16結合蓋體17成為一體。 As shown in FIG. 1 , a preferred embodiment of a tool 10 of the present invention includes: an adapter 11 , a rod 14 , a head member 15 and a blade 18 , and the blade 18 is detachably mounted on the head member 15 . The rod 14 is connected to a head member 15 which becomes the end of the rod 14 . The head member 15 is composed of a first head 16 and a cover 17, and the first head 16 is detachably mounted with a blade 18. A set of fasteners 13a passes through a set of holes 16b of the first head 16, the fastener 13a is a bolt, and the bolt locks the cover 17, so that the first head 16 and the cover 17 are integrated.

第2圖是分解圖，闡明頭構件15離開桿14，一個減震器20從桿14的一個槽14a來到外界。換個角度來看，該頭構件15結合在槽14a的開口，將減震器20封在桿14的槽14a中。具體而言，該桿14圍成槽14a處形成一段內螺紋14b。所述的蓋體17宛如螺栓般鎖住內螺紋14b，進而封住槽14a的開口，阻止減震器20離開桿14。該減震器20的一段外螺紋21嚙接內螺紋14b，因為內螺紋14b與外螺紋21存在空隙，所以減震器20能相對桿14往復運動。 Figure 2 is an exploded view illustrating that the head member 15 leaves the rod 14 and a shock absorber 20 comes to the outside from a slot 14a of the rod 14. Viewed from another angle, the head member 15 engages in the opening of the groove 14a to enclose the shock absorber 20 in the groove 14a of the rod 14 . Specifically, a section of internal thread 14b is formed where the rod 14 surrounds the groove 14a. The cover body 17 locks the inner thread 14b like a bolt, thereby sealing the opening of the groove 14a and preventing the shock absorber 20 from leaving the rod 14 . A section of the external thread 21 of the shock absorber 20 engages with the internal thread 14b. Because there is a gap between the internal thread 14b and the external thread 21, the shock absorber 20 can reciprocate relative to the rod 14.

另外，該減震器20朝向頭構件15的端面22陷入一道溝23，該溝23能接收頭構件15的一個片體17a，該片體17a立在蓋體17面對減震器20的一面。在頭構件15鎖入槽14a時，該片體17a配合溝23的凹凸關係，將頭構件15的扭矩傳遞至減震器20，依內螺紋14b與外螺紋21的嚙接關係，該減震器20能順利的進入桿14的槽14a中。 In addition, the shock absorber 20 sinks into a groove 23 toward the end face 22 of the head member 15 , and the groove 23 can receive a piece 17 a of the head member 15 , the chip 17 a standing on the side of the cover body 17 facing the shock absorber 20 . . When the head member 15 is locked into the groove 14a, the piece 17a matches the concave-convex relationship of the groove 23 to transmit the torque of the head member 15 to the shock absorber 20. According to the engagement relationship between the inner thread 14b and the outer thread 21, the shock absorber The device 20 can smoothly enter the groove 14a of the rod 14.

必要時，該桿14鄰接蓋體17處施以銲接(如點銲)處理。所述的蓋體17在桿14固定不動，使桿14的內部具備減震器20為常態。 When necessary, the rod 14 is welded (eg, spot welded) to the position where the rod 14 is adjacent to the cover body 17 . The cover body 17 is fixed on the rod 14, and it is normal that the shock absorber 20 is provided inside the rod 14.

接著看到第3圖，該轉接部11和桿14都是圓形物體，該轉接部11的直徑大於桿14的直徑，該桿14結合在轉接部11的一個偏心位置。另外，該轉接部11的二組孔12在桿14兩旁。 Then see FIG. 3 , the adapter 11 and the rod 14 are both circular objects, the diameter of the adapter 11 is larger than the diameter of the rod 14 , and the rod 14 is combined at an eccentric position of the adapter 11 . In addition, the two groups of holes 12 of the adapter portion 11 are on both sides of the rod 14 .

此處所稱的偏心位置，是指順著轉接部11虛擬的一條中心線11a方向，該桿14立在轉接部11的外面。所述的桿14規劃虛擬的一條軸心線14c，該軸心線14c與中心線11a保持一個距離11b。 The eccentric position referred to here refers to the direction along a virtual center line 11 a of the adapter portion 11 , and the rod 14 stands outside the adapter portion 11 . The rod 14 is planned with a virtual axis line 14c, and the axis line 14c is kept at a distance 11b from the center line 11a.

如第4圖所示，該轉接部11結合一個刀桿30的端面，該刀桿30與轉接部11的直徑相等，讓刀桿30成為刀具10的一部分，相對延伸刀具10的長度。此處所稱的結合，是指其他緊固件13穿過轉接部11的孔12，從而鎖住刀桿30。其中，該刀桿30配置在一個刀座31固定不動，該刀座31設在一個宛如刀塔或刀庫的機械設備34。 As shown in FIG. 4 , the adapter portion 11 is combined with an end face of a tool shank 30 , the diameter of the tool shank 30 and the adapter portion 11 are equal, so that the tool shank 30 becomes a part of the tool 10 and extends the length of the tool 10 relatively. The combination referred to here means that the other fasteners 13 pass through the holes 12 of the adapter portion 11 to lock the cutter bar 30 . Wherein, the tool holder 30 is fixed on a tool seat 31, and the tool seat 31 is arranged on a mechanical device 34 like a tool turret or a tool magazine.

在第5圖中，當工件40沿著轉動方向41自轉，該刀具10順著一個切削方向10a前進，驅使第一頭部16的刀片18對工件40內部的大直徑孔42和小直徑孔43完成異徑加工作業。 In FIG. 5, when the workpiece 40 rotates along the rotation direction 41, the tool 10 advances along a cutting direction 10a, and drives the blade 18 of the first head 16 to the large-diameter hole 42 and the small-diameter hole 43 inside the workpiece 40 Complete the different diameter machining operation.

該桿14到蓋體17的長度總和，大於工件40的軸心長度，相對延伸刀片18與轉接部11(或刀桿30)的距離，使刀桿30(或轉接部11)不 觸碰工件40圍成大直徑孔42的壁。該刀片18在工件40切削小直徑孔43的深度比先前技術還要深，能有效解決異徑加工的短行程弊端。 The total length of the rod 14 to the cover body 17 is greater than the length of the axis of the workpiece 40, and the distance between the blade 18 and the adapter part 11 (or the knife rod 30) is relatively extended, so that the knife rod 30 (or the adapter part 11) does not The wall of the workpiece 40 that encloses the large diameter hole 42 is touched. The depth of the insert 18 for cutting the small-diameter hole 43 in the workpiece 40 is deeper than that of the prior art, and can effectively solve the short-stroke drawback of the different-diameter machining.

切削時，依上、下、左或右方向，該減震器20在槽14a內往復運動，抗衡桿14震顫致生的動能。該刀具10穩定後，自然會減少刀片18的震顫現象，避免刀尖撞擊工件40產生鈍化的損耗。 When cutting, the shock absorber 20 reciprocates in the groove 14a according to the up, down, left or right direction, to counteract the kinetic energy generated by the vibration of the rod 14. After the tool 10 is stabilized, the chattering phenomenon of the blade 18 will naturally be reduced, and the loss of dullness caused by the impact of the tool tip on the workpiece 40 will be avoided.

如第6圖所示，所述的蓋體17結合一個第二頭部16a，共同組成新的頭構件15。該工件40仍舊沿著轉動方向41自轉。該刀具10順著切削方向10a前進，驅使第二頭部16a的刀片18在工件40內部切削一個宛如橢圓形的曲面44，完成彈體加工作業。 As shown in FIG. 6 , the cover body 17 is combined with a second head 16 a to form a new head member 15 . The workpiece 40 still rotates in the rotational direction 41 . The tool 10 advances along the cutting direction 10a, and drives the blade 18 of the second head 16a to cut an elliptical curved surface 44 inside the workpiece 40 to complete the projectile machining operation.

當然，該桿14到蓋體17的長度總和，相對延伸刀片18與轉接部11(或刀桿30)的距離。在刀桿30(或轉接部11)不觸碰曲面44的前提下，該刀片18在工件40切削曲面44的深度比先前技術還要深，能有效解決彈體加工的短行程弊端。 Of course, the total length of the rod 14 to the cover body 17 is relative to the distance between the extension blade 18 and the adapter 11 (or the blade rod 30 ). On the premise that the tool shank 30 (or the adapter portion 11 ) does not touch the curved surface 44 , the depth of the cutting surface 44 of the blade 18 on the workpiece 40 is deeper than that of the prior art, which can effectively solve the short-stroke drawback of projectile machining.

同樣的，該減震器20在槽14a內往復運動，抗衡桿14震顫致生的動能。穩定的刀具10會減少刀片18的震顫現象，避免刀尖撞擊工件40產生鈍化的損耗。 Likewise, the shock absorber 20 reciprocates in the groove 14a to counteract the kinetic energy of the rod 14 caused by the vibration. The stable tool 10 will reduce the chattering phenomenon of the blade 18 and avoid the loss of dullness caused by the tool tip hitting the workpiece 40 .

10:刀具 10: Knives

11:轉接部 11: transfer part

12、16b:孔 12, 16b: hole

13、13a:緊固件 13, 13a: Fasteners

14:桿 14: Rod

15:頭構件 15: Head Components

16:第一頭部 16: First Head

17:蓋體 17: Cover

18:刀片 18: Blades

Claims (8)

一種增程抗震刀具，包括：一個轉接部(11)；一個桿(14)結合在該轉接部(11)的一個偏心位置，所述的偏心位置是指：該轉接部(11)的直徑大於桿(14)的直徑，順著轉接部(11)虛擬的一條中心線(11a)方向，該桿(14)立在轉接部(11)的外面，致使桿(14)虛擬的一條軸心線(14c)與中心線(11a)保持一個距離(11b)；一個頭構件(15)與該桿(14)相連，該頭構件(15)成為桿(14)的端部；一個刀片(18)能拆卸地安裝於該頭構件(15)上；一個減震器(20)設在該桿(14)的內部；以及一根刀桿(30)以端部鎖固直徑相等的該轉接部(11)，所述的刀桿(30)與該桿(14)保持偏心狀態。 An extended-range anti-vibration tool, comprising: an adapter (11); a rod (14) coupled to an eccentric position of the adapter (11), and the eccentric position refers to: the adapter (11) The diameter of the rod (14) is larger than the diameter of the rod (14), along the direction of a virtual center line (11a) of the adapter (11), the rod (14) stands outside the adapter (11), so that the rod (14) is virtual An axis line (14c) of the shaft is kept at a distance (11b) from the center line (11a); a head member (15) is connected with the rod (14), and the head member (15) becomes the end of the rod (14); A blade (18) is detachably mounted on the head member (15); a shock absorber (20) is provided inside the rod (14); The adapter portion (11) is provided, and the cutter bar (30) and the bar (14) are kept in an eccentric state. 如請求項1所述的增程抗震刀具，其中，該頭構件(15)結合桿(14)的一個槽(14a)的開口，將減震器(20)封在槽(14a)中。 The extended-range anti-vibration tool of claim 1, wherein the head member (15) is combined with the opening of a groove (14a) of the rod (14) to seal the shock absorber (20) in the groove (14a). 如請求項2所述的增程抗震刀具，其中，該桿(14)圍成槽(14a)處形成一段內螺紋(14b)，該內螺紋(14b)嚙接減震器(20)的一段外螺紋(21)。 The extended-range anti-vibration tool according to claim 2, wherein a section of internal thread (14b) is formed at the position where the rod (14) surrounds the groove (14a), and the internal thread (14b) engages with a section of the shock absorber (20). External thread (21). 如請求項3所述的增程抗震刀具，其中，該減震器(20)朝向頭構件(15)的端面(22)陷入一道溝(23)，該溝(23)能接收頭構件(15)的一個片體(17a)。 The extended-range anti-vibration tool as claimed in claim 3, wherein the end face (22) of the shock absorber (20) facing the head member (15) sinks into a groove (23), the groove (23) being capable of receiving the head member (15) ) of a sheet (17a). 如請求項4所述的增程抗震刀具，其中，該頭構件(15)包括：一個第一頭部(16)能拆卸地安裝刀片(18)。 The extended-range anti-vibration cutter according to claim 4, wherein the head member (15) comprises: a first head (16) removably mounts the blade (18). 如請求項5所述的增程抗震刀具，其中，所述的頭構件(15)還有一個蓋體(17)，其與第一頭部(16)結合在一起，所述的蓋體(17)鎖住內螺紋(14b)並封住槽(14a)的開口。 The extended-range anti-vibration tool according to claim 5, wherein the head member (15) further has a cover (17), which is combined with the first head (16), the cover (17). 17) Lock the female thread (14b) and seal the opening of the groove (14a). 如請求項6所述的增程抗震刀具，其中，該片體(17a)立在蓋體(17)朝向減震器(20)的一面。 The extended-range anti-vibration cutter according to claim 6, wherein the sheet body (17a) stands on the side of the cover body (17) facing the shock absorber (20). 如請求項6所述的增程抗震刀具，其中，至少一個緊固件(13a)穿過第一頭部(16)而與蓋體(17)相連。 The extended-range anti-vibration cutter according to claim 6, wherein at least one fastener (13a) passes through the first head (16) and is connected with the cover body (17).
TW110120051A 2021-06-02 2021-06-02 Extended range anti-vibration tool TWI768945B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005199391A (en) * 2004-01-16 2005-07-28 Hitachi Ltd Vibration isolating tool holder
US20060275090A1 (en) * 2005-04-28 2006-12-07 Hideaki Onozuka Tool having damper, cutting method using the same, and manufacturing method of impeller or guide vane of fluid machine
TWM385422U (en) * 2009-11-19 2010-08-01 Monkula Entpr Co Ltd Shock-absorbing structure for a cutting tool
US20160067787A1 (en) * 2014-09-09 2016-03-10 Enrico R. Giannetti Machine tool having anti-vibration tuning mechanism for chatter minimized machining
EP3311942B1 (en) * 2016-10-24 2019-03-13 Christian Pellini Device and system for supporting micro-tools
CN212191286U (en) * 2020-05-26 2020-12-22 宜昌宇能精密科技有限公司 Eccentric cutter for processing internal curved surface of workpiece

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005199391A (en) * 2004-01-16 2005-07-28 Hitachi Ltd Vibration isolating tool holder
US20060275090A1 (en) * 2005-04-28 2006-12-07 Hideaki Onozuka Tool having damper, cutting method using the same, and manufacturing method of impeller or guide vane of fluid machine
TWM385422U (en) * 2009-11-19 2010-08-01 Monkula Entpr Co Ltd Shock-absorbing structure for a cutting tool
US20160067787A1 (en) * 2014-09-09 2016-03-10 Enrico R. Giannetti Machine tool having anti-vibration tuning mechanism for chatter minimized machining
EP3311942B1 (en) * 2016-10-24 2019-03-13 Christian Pellini Device and system for supporting micro-tools
CN212191286U (en) * 2020-05-26 2020-12-22 宜昌宇能精密科技有限公司 Eccentric cutter for processing internal curved surface of workpiece

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