• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ABSTRACT A cutting tool gripper of the invention is a cutting tool gripper for mounting abar-shaped cutting tool in a cutting machine after one end part of the bar-shaped cuttingtool is inserted into a mounting hole thereby being fixed, the cutting tool gripperincludes: a damping alloy tube body Which includes a damping alloy having acomponent composition containing, in terms of mass%, Cu: from 16.9 to 27.7%, Ni:from 2.1 to 82% and Fe: from 1.0 to 2.9%, With C: 0.05% or less and the remainderbeing Mn and unavoidable impurities, and Which affords, as the mounting hole, a centerthrough hole along a longitudinal direction of the damping alloy tube body and has athreaded outer peripheral surface; and a rigid holding tube body Which includes amaterial having a Young's modulus larger than the damping alloy and has a threadedcylindrical inner surface, and the damping alloy tube body having the threaded outerperipheral surface is threadably fixed along the threaded cylindrical inner surface of the rigid holding tube body. 17
    公开号:SE1451635A1
    申请号:SE1451635
    申请日:2013-06-21
    公开日:2014-12-22
    发明作者:Fumihito Sakurai；Kenji Watanabe
    申请人:Daido Steel Co Ltd；Institute Of National Colleges Of Technology Japan；
    IPC主号:
    专利说明:

    [3] [0003] For example, Patent Document 1 discloses a technique Where for preventing Vibration generated in a boring bar at the time of cutting Work from directly propagating to a cutting tool gripper, a cylindrical sleeve including a damping member is f1tted intoa f1tting hole extending along the axis line of a cylindrical gripper body including a steelmaterial, etc. and the shank part of a boring bar is inserted into the inner peripheralsurface of the sleeve and pressed/fixed by a clamp screw. The outer peripheral surfaceportion opposite the abutting portion of the shank part on the clamp screw is arranged asa pressing face, and a damping member is interposed between the pressing surface andthe opposing inner surface portion of the f1tting hole to thereby damp/absorb Vibrationgenerated in the boring bar and suppress deflection of the boring bar, particularly,prevent "chatter Vibration" due to resonant Vibration of the shank part and the gripperbody. As the damping member usable in such a pressing face portion, aluminum,copper, zinc, brass, an alloy using such a metal as the main ingredient, a damping steelsheet, etc. are recited.
    [4] [0004] Furthermore, Patent Document 2 discloses a technique where a core member isthreadably fitted along the axial center of a metal-made sleeve, a cutting tool is mountedby fitting the shank thereof into a tool holding hole of the core member, and puremagnesium or a magnesium alloy, which are lightweight and excellent in the Vibrationabsorptivity, can be used for the core member. The sleeve and the core member in acutting tool gripper are formed separately so that Vibration transmitted to the mount of acutting machine through a cutting tool gripper from a cutting tool at the time of cuttingwork can be absorbed by the core member.
    [5] [0005] Also, Patent Document 3 discloses a technique where a damping member isinterposed between a cutting tool and a tool post to which the cutting tool is pressed andfixed, and it is stated that as the damping coefficient of the damping member is higher, Vibration at the time of cutting work can be suppressed and the impact response, for example, in engaging the cutting tool can be reduced, but the damping performance is ina tradeoff relationship With the rigidity or strength expressed by tensile strength, etc.and an excessively high damping property rather leads to violent vibration of the cuttingtool and incurs deterioration of the machining accuracy. In consideration thereof, thedamping member is specified to be preferably a metal material having a tensile strengthof 500 to 650 MPa and a logarithmic damping factor of 0.2 to 0.35, for example, a Mn- based damping alloy having a fiandamental composition of, in terms of atm%, Cu: 20i5%, Ni: 5i3% and Fe: 2i1%.
    [6] [0006] Patent Document 1: JP-UM-A-05-088804Patent Document 2: Japanese Utility Model Registration No. 3,153,247Patent Document 3: JP-A-2004-202649SUMMARY OF THE INVENTION PROBLEMS THAT THE INVENTION IS TO SOLVE
    [7] [0007] As disclosed in Patent Documents 1 to 3, it is Widely practiced to interpose adamping member between a cutting tool and a portion to Which the cutting tool ispressed and fixed. The damping properties of the damping member greatly differdepending on the material thereof, nevertheless, studies have not been made on thedesign of a cutting tool gripper, etc. optimized for each material of the dampingIn other Words, it has not been necessarily true that vibration of a cutting tool member. is maximally suppressed to afford cutting Work With high machining accuracy.
    [8] [0008]The present invention has been made under these circumstances, and an objectof the present invention is to provide a cutting tool gripper enabling cutting Work With excellent machining accuracy.
    [10] [0010] According to the invention in this aspect, the damping alloy tube bodyincluding an Mn-based tWinned damping alloy having relatively high rigidity andstrength and at the same time, having a high damping ability of eff1ciently absorbingvibration at a Wide frequency range is threadably fixed With a Wide area along the cylindrical inner surface of the rigid holding tube body, Whereby the cutting Work performed by mounting a cutting tool in such a cutting tool gripper can afford excellentmachining accuracy.[001 1] In the invention described above, the damping alloy tube body may bethreadably fixed along the cylindrical inner surface while inserting an end part of thedamping alloy tube body into the rigid holding tube body so that a flange part providedin the opposite end part of the damping alloy tube body in the longitudinal direction ispressed against an end face of the rigid holding tube body. According to the inventionin this aspect, the damping alloy tube body including an Mn-based twinned dampingalloy having relatively high rigidity and strength is threadably fixed more firmly with awide area along the cylindrical inner surface of the rigid holding tube body, whereby thecutting work performed by mounting a cutting tool in such a cutting tool gripper can afford more excellent machining accuracy.
    [14] [0014] As shown in Fig. 1, the gripper 1 for gripping a cutting tool and mounting thecutting tool in a cutting machine is fabricated by concentrically combining a nearlycylindrical holding tube body including a rigid material (rigid holding tube body) 2 anda nearly cylindrical sleeve including a damping alloy (damping alloy tube body) 3.The holding tube body 2 has a flange 21 at one end part thereof, the sleeve 3 is insertedfrom an end part opposite to the flange 21, and a side surface of a flange part 31provided in one end part of the sleeve 3 is abutted on an end face 24 of the holding tubebody 2.
    [15] [0015] Referring to Fig. 2 in combination, the inner peripheral surface 22 of theholding tube body 2 is provided with an intemal thread along the axis line over theentire length. Also, the holding tube body 2 is provided with a through hole 23penetrating to the inner peripheral surface 22 from the outer peripheral surface, intowhich a bolt for fixing a cutting tool is f1tted as described later. A plurality of through holes 23 are provided along the axis line direction. The holding tube body 2 is a rigid body including, for example, a steel such as S45C and having at least a Young'smodulus larger than the sleeve 3 described later, and typically, it is preferable to have aYoung's modulus as large as two times or more that of the sleeve 3.
    [16] [0016] As shown in Fig. 3, the outer peripheral surface 32 except for the flange part 31of the sleeve 3 is provided with an external thread along the axis line direction and canbe threaded to correspond to the above-described internal thread on the inner peripheralsurface 22 of the holding tube body 2. The inner peripheral surface of the tube-shapedsleeve 3 def1nes a mounting hole 34 for the insertion and mounting of a cutting tool.The sleeve 3 is provided with a plurality of through holes 33 corresponding to throughholes 23 of the holding tube body 2 and penetrating in the radial direction from theouter peripheral surface 32 to the inner peripheral surface. That is, each through hole33 is provided at the position allowing for communication with the through hole 23when the sleeve 3 is threadably fixed to the holding tube body 2 (see, Fig. 1).
    [17] [0017] The sleeve 3 includes a twinned Mn-based damping alloy that is a Mn-Cu-Ni-Fe-based damping alloy having a component composition containing, in terms ofmass%, Cu: from 16.9 to 27.7%, Ni: from 2.1 to 82% and Fe: from 1.0 to 29%, with C:005% or less and the remainder being Mn and unavoidable impurities (low contentelements such as O and N). The composition range of each component (all in terms ofmass%) is described below. If the amount of Cu is less than 16.9%, a twinned crystalis not generated, whereas if the amount thereof exceeds 27.7%, segregation is increased,resulting in failure to obtain sufficient damping properties. The amount of Cu ispreferably from 19.7 to 25.0%. Ni is added as a third element together with mainIf the elements Mn and Cu, thereby being able to enhance the damping properties. amount of Ni is less than 2.1%, the element cannot contribute to change for twinned crystal generation, Whereas if the amount thereof exceeds 82%, the contribution to thetWinned crystal generation is saturated. Fe is added as a fourth element together WithMn and Cu or together With Ni, thereby being able to more enhance the dampingproperties. If the amount of Fe is less than l.0%, the element cannot contribute tochange for tWinned crystal generation, Whereas if the amount thereof exceeds 2.9%, thecontribution to the tWinned crystal generation is saturated. The amount of C is set tobe 0.05% or less, Whereby the damping properties can be prevented from deteriorationeven When Mn is evaporated and the relative concentration of C is raised.
    [18] [0018] As described above, the damping alloy in this embodiment forms a tWinnedcrystal and absorbs vibration by converting an extemally imposed vibration energy to africtional heat at the tWinned crystal interface. This damping alloy has a high dampingability for vibration in a Wide frequency range and can eff1ciently absorb vibration,compared With a general damping alloy. Particularly, due to loading of compressionstress, frictional heat is produced at the tWinned crystal interface even With a smallerstress, and vibration can be eff1ciently absorbed. Furthermore, the damping alloy hashigh rigidity and strength, compared With a general damping alloy.
    [19] [0019] Again referring to Fig. 1, the inner peripheral surface 22 of the holding tubebody 2 and the outer peripheral surface 32 of the sleeve 3 are screWed to each other andfixed With a large area, compared With a case of intemally f1tting smooth surfaces toeach other. Furthermore, the sleeve 3 is screWed While pressing a side surface of theflange part 31 thereof against the end face 24 of the holding tube body 2 as a rigid bodyhaving a larger Young's modulus, thereby applying a larger surface pressure to the outer peripheral surface 32 having faces that are inclined from the axis line direction by threading, as a result, the sleeve 3 is more f1rmly fixed to the holding tube body 2.
    [20] [0020] As shown in Fig. 4, the above-described gripper 1 is inserted into a holdinghole 64 of a holder 60 fixed to a cutting machine (not shown) after inserting a grasp part52 of a bar-shaped cutting tool 50 into the mounting hole 34. At this time, the sidesurface of the flange 21 is abutted on the holder 60, and a chip 51 of the cutting tool 50is protruded from the holder 60. In this state, a bolt hole 63 having an intemal thread,provided on the holder 60, is arranged at the position communicating With the throughhole 23, 33 of the gripper 1 and a plurality of bolts 4 are fastened through the bolt holes63, as a result, the distal end of the bolt 4 is abutted against the cutting tool 50. Thecutting tool 50 is pressed in the travelling direction of the bolt 4, and the outerperipheral surface opposite to the abutting portion of the cutting tool 50 on the bolt 4 ispressed against the inner peripheral surface of the sleeve 3, thereby being fixed. As aresult, the cutting Work can be performed While moving the chip 51 relative to aWorkpiece.[0021] According to the above-described embodiment, the sleeve 3 including atWinned Mn-based damping alloy is threadably fixed to the inner peripheral surface ofthe highly rigid holding tube body 2 With a large area, compared With a case ofinternally fitting smooth surfaces to each other. Thereafter, a plurality of bolts 4 arefastened, Whereby the outer peripheral surface of the cutting tool 50, opposite to theportion abutted by the bolt 4, is pressed and fixed to the inner peripheral surface of thesleeve 3. That is, the sleeve 3 fixes the cutting tool 50 While being, due to its rigidity,biased and compressed against the holding tube body 2 With a larger area covering theentire region in the axial direction and at the same time, over a Wide range in thecircumferential direction.
    [22] [0022] Incidentally, the sleeve 3 is screwed inside the holding tube body 2 whilepressing the side surface of flange part 31 thereof to the end face 24 of the holding tubebody 2 including a rigid body having a larger Young's modulus, whereby the forceexerted in the screw travelling direction by the sleeve 3 and the force exertedthereagainst by the flange part 31 of the sleeve 3 are applied to the threaded outerperipheral surface 32 of the sleeve 3, i.e., the outer peripheral surface 32 havingthreaded faces that are a face inclined relative to the axis line direction, whereby thesleeve 3 can be more firmly fixed to the holding tube body 2. In other words, thevibration generated in the cutting tool 50 can be more efficiently absorbed.
    [23] [0023][Evaluation Test] The results of the cutting work (boring work) using the cutting tool gripper ineach of Example and Comparative Examples of the present invention are illustratedbelow by referring to Figs. 5 and 6. The results of the cutting work were evaluated bymeasuring the roundness and surface roughness as described later.
    [24] [0024] Example 1 is a cutting tool gripper (hereinafter referred to as "screw type")obtained by screwing together a sleeve 3 composed of an Mn-Cu-Ni-Fe-based dampingalloy having a component composition of, in terms of mass%, Cu: 224%, Ni: 52%, Fe:2.0% and C: 0.01%, with the remainder being Mn and unavoidable impurities, and aholding tube body 2 composed of S45C. More specifically, the holding tube body 2 has an outer diameter of 40 mm, where an intemal thread of M33><2 is formed on the inner peripheral surface thereof over the entire length. The sleeve 3 has an innerdiameter of 25.2 mm, Where an extemal thread of M33><2 is formed on the outerperipheral surface thereof The total length of the cutting tool gripper obtained byscreW-fixing these members, that is, the total length of the sleeve 3, is 96 mm.
    [25] [0025] Comparative Example 1 is a cutting tool gripper (hereinafter, referred to as"fitting type") obtained by, unlike Example 1, fixing a cylindrical sleeve to a holdingtube body by cold fitting, Without screwing together a sleeve 3 and a holding tube body2. Here, the boundary diameter is 31 mm, and other dimensions are the same as inExample 1. Comparative Examples 2 and 3 are cutting tool grippers (hereinafter,referred to as "integral type") obtained by integrally forming a holding tube body and asleeve. The materials of Comparative Examples 2 and 3 are respectively S45C usedfor the holding tube body 2 of Example 1 and the Mn-Cu-Ni-Fe-based damping alloyused for the sleeve 3 of Example 1.
    [26] [0026] As for the cutting Work, boring Work for a feed distance of 80 mm Wasperformed in 3 passes on a Workpiece that is a cylindrical body composed of SUS304and having a length of 200 mm, an outer diameter of 100 mm and an inner diameter of62 mm, under the conditions of a cutting speed of 100 m/min, a cutting amount of 0.5mm, a feed rate of 0.2 mm/rev and a tool protrusion amount of 140 mm.
    [27] [0027] The roundness Was measured on the inner peripheral surface of a machinedhole after 3 passes of boring Work by using a commercially available three-dimensionalmeter. In the measurement, the roundness Was measured in 4 portions at a depth of 3 mm, 6 mm, 25 mm and 45 mm from the end face of the machined hole, and for comprehensive evaluation of each case, the average value of measured values of 4 11 portions was recorded. The average Value of each case is shown in the lower part ofFig. 5.[0028] The surface roughness was measured at 3 points by a commercially availablesurface roughness meter in a portion at a depth of 30 mm from the end face of the innerperipheral surface of the workpiece every time the boring work was perforrned for lpass, and the average value thereof was deterrnined. The boring work was perforrnedin 3 passes, and the average value of the surface roughness Ra in every pass wasrecorded.
    [29] [0029] As shown in Figs. 5 and 6, in Example l of "screw type", the roundness wasfrom 6.3 to 8.7 um and 7.4 um on average, and the surface roughness Ra was from 1.69to l.93 um. The surface roughness Ra showed a stable value even when the number ofpasses was increased.
    [30] [0030] On the other hand, in Comparative Example l of "f1tting type", the roundnesswas from ll.9 to 2l.4 um and l6.3 um on average and was larger than in Example l.The surface roughness Ra was from 2.42 to 5.0l um and was also large compared withExample l. That is, in terms of the machining accuracy evaluated by the roundnessand surface roughness Ra, Example l was superior to Comparative Example l. [003l] In Comparative Example 2 of "integral type" composed of S45C, the roundnesswas from 9.2 to l0.l um and 9.7 um on average and was larger than in Example l.Also, the surface roughness Ra was from 3.99 to 5.35 um and was larger than inExample l.
    [34] [0034]Also, as shown in Fig. 7, a continuous intemal thread may be imparted to inner peripheral surfaces of a through hole 23 of the holding tube body 2 and a through hole 33 of the sleeve 3, and a setscreW 42 may be fastened thereto to abut its distal end on 13 the cutting tool 50 so that the cutting tool 50 can be pressed and fixed to the innerperipheral surface of the sleeve 3. At this time, the setscreW 42 does not protrude fromthe outer peripheral surface of the holding tube body 2 and does not come into contactWith the holder 60. Incidentally, the holding tube body 2 is pressed and fixed to theholder 60 by a bolt (not shown). The setscreW 42 does not come into contact With theholder 60, so that Vibration generated in the cutting tool 50 can be preVented fromtransmitting outside of the cutting tool gripper 1. As another example, a shortersetscreW 42 may be used not to protrude from the outer peripheral surface of the sleeve3. That is, by keeping the setscreW 42 from contacting not only With the holder 60 butalso With the holding tube body 2, Vibration generated in the cutting tool 50 can bepreVented from being mediated by the sleeve 3 and transmitted outside.
    [35] [0035] While the present inVention has been described above With reference torepresentative Examples thereof, the present inVention is not necessarily limited thereto.One skilled in the art Would be able to find Various alternative Examples andmodifications Without departing from the gist of the present inVention or the scope ofpatent claims attached.
    [36] [0036] This application is based on Japanese Patent Application (Patent Application No. 2012-146856) filed on June 29, 2012, the entirety of Which is incorporated herein by reference.
    [37] [0037] 14 According to the cutting tool gripper of the present invention, excellentniachining accuracy is achieved in the cutting Work performed by niounting a cutting tool in such a cutting tool gripper.
    [38] [0038] l Gripper 2 Holding tube body3 Sleeve 22 Inner peripheral surface3l Flange part 32 Outer peripheral surface34 Mounting hole 50 Cutting tool
    权利要求:
    Claims (2)
    [1] 1. [Claim 1] A cutting tool gripper for mounting a bar-shaped cutting tool in a cuttingmachine after one end part of the bar-shaped cutting tool is inserted into a mountinghole thereby being fixed, Wherein the cutting tool gripper comprises: a damping alloy tube body Whichcomprises a damping alloy having a component composition containing, in terms ofmass%, Cu: from 16.9 to 27.7%, Ni: from 2.1 to 82% and Fe: from 1.0 to 2.9%, With C:0.05% or less and the remainder being Mn and unavoidable impurities, and Whichaffords, as the mounting hole, a center through hole along a longitudinal direction of thedamping alloy tube body and has a threaded outer peripheral surface; and a rigidholding tube body Which comprises a material having a Young's modulus larger than thedamping alloy and has a threaded cylindrical inner surface, and the damping alloy tube body having the threaded outer peripheral surface isthreadably fixed along the threaded cylindrical inner surface of the rigid holding tubebody.
    [2] 2. [Claim 2] The cutting tool gripper according to claim 1, Wherein the damping alloy tubebody is threadably fixed along the cylindrical inner surface While inserting an end partof the damping alloy tube body into the rigid holding tube body so that a flange partprovided in the opposite end part of the damping alloy tube body in the longitudinal direction is pressed against an end face of the rigid holding tube body. 16
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    同族专利:
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    WO2014002905A1|2014-01-03|
    SE538022C2|2016-02-09|
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    IN2014DN11026A|2015-09-25|
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    引用文献:
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    JPS4928984A|1972-07-13|1974-03-14|
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    JPH0570808U|1991-02-01|1993-09-24|三菱マテリアル株式会社|Boring bar mounting structure|
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    SE528470C2|2004-02-03|2006-11-21|Mircona Ab|Vibration-damped tool holder with viscoelastic damping material|
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    JP3153247U|2009-06-17|2009-08-27|株式会社宮本製作所|Tool holding jig|KR101436984B1|2012-10-04|2014-09-04|한국기계연구원|Apparatus and method for reduction of vibration in machine tool|
    JP2016087708A|2014-10-29|2016-05-23|独立行政法人国立高等専門学校機構|Inner sleeve for taper collet and cutting tool holder|
    KR101693839B1|2015-01-05|2017-01-06|두산중공업 주식회사|Boring head|
    JP6352850B2|2015-04-10|2018-07-04|株式会社新興鉄工所|Tool positioning jig|
    US9993876B2|2015-12-21|2018-06-12|Iscar, Ltd.|Cutting tool holder with vibration damping weight assembly|
    CN108747558B|2018-05-28|2019-05-07|西北工业大学|A kind of cylindrical parts milling vibration suppression realization device and its milling vibration suppression method|
    法律状态:
    2018-01-30| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012146856A|JP5805019B2|2012-06-29|2012-06-29|cutting tool gripper|
    PCT/JP2013/067119|WO2014002905A1|2012-06-29|2013-06-21|Cutting tool gripping tool|
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