• 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:
    [00041] ABSTRACT OF THE DISCLOSURE A tool holder includes a tool holder body With an insert-receivingpocket and a clanip for claniping a cutting insert. The clanipincludes a pair of doWnWardly extending nubs that engage a pair ofnotches in the cutting insert When the clanip is brought intopressing engagenient With the insert, thereby securely claniping the cutting insert in the insert-receiving pocket of the tool holder. 16
    公开号:SE1350165A1
    申请号:SE1350165
    申请日:2013-02-12
    公开日:2013-08-17
    发明作者:John Baca；Ashwin Murali；Kent Mizgalski
    申请人:Kennametal Inc；
    IPC主号:
    专利说明:

    [1] [0001]
    [2] [0002]
    [3] [0003]
    [4] [0004] NOTCHES FIELD OF THE INVENTION The present invention pertains to a tool holder for clamping cuttinginserts. More particularly, the present invention relates to a toolholder for clamping a “dogbone” cutting insert securely to the tool holder.
    [5] [0005]
    [6] [0006] of the tool holder body; a clamp arranged on the tool holder body,the clamp including a top surface, a forward lower face and arearward lower face, and an aperture forrned therethrough, theclamp including a nose portion with a pair of downward extendingnubs; and a clamp screw capable of being inserted through theaperture of the clamp and at least partially received in the clamp-securing bore of the tool holder body to bring the clamp intopressing engagement with the insert, wherein the pair of nubs of theclamp engage the pair of notches in the cutting insert when theclamp is brought into pressing engagement with the insert, therebysecurely clamping the cutting insert in the insert-receiving pocketof the tool holder.
    [7] [0007]
    [8] [0008]
    [9] [0009]
    [10] [00010]
    [11] [00011]
    [12] [00012]
    [13] [00013]
    [14] [00014]
    [15] [00015]
    [16] [00016] BRIEF DESCRIPTION OF THE DRAWINGS While various embodiments of the inVention are illustrated, theparticular embodiments shown should not be construed to limit theclaims. It is anticipated that Various changes and modif1cationsmay be made without departing from the scope of this invention.Fig. 1 is an exploded side isometric view of a tool holder andcutting insert in accordance with an embodiment of the invention;Fig. 2 is an isometric View of the tool holder and cutting insert ofFig. 1 when assembled; Fig. 3 is a partial enlarged top View of the clamp of the tool holderand the cutting insert; Fig. 4 is a partial cutaway cross-sectional view of the tool holder inan unclamped position taken along line 4-4 of Fig. 3; Fig. 5 is an enlarged isometric View of the clamp with downwardlyextending nubs and cutting insert with notches in accordance withthe invention; Fig. 6 is an enlarged partial side View of the tool holder in theclamped position in accordance with the invention; Fig. 7 is an enlarged isometric View of the clamp and the cuttinginsert when in an unclamped position in accordance with theinvention; and Fig. 8 is an enlarged isometric View of the clamp and the cutting insert when in a clamped position in accordance with the invention.
    [17] [00017]
    [18] [00018]
    [19] [00019] In the illustrated embodiment, the cutting insert 22 is generallydiamond in shape and has a pair of notches 24, 25 formed in twoopposite sides of the insert 22, thereby giving the cutting insert 22 a“dogbone” shape. In other words, the illustrated cutting insert hasfour sides in which the notches 24, 25 are forrned in oppositecorners of adj acent sides. However, it will be appreciated that thecutting insert can have any polygonal shape, such as a triangle,rectangle, pentagon, and the like. For example, the cutting insert22 can be triangular in shape in which a notch can be located onone or more legs of the triangle. In other words, the notches can belocated along the sides, for example, at the median for a cuttinginsert having an odd number of sides, and located on the comers ofadjacent sides for a cutting insert having an even number of sides.Each notch 24, 25 has a forward surface 24a, 25a (i.e., closer to theforward end of the tool holder 10), rearward surface 24b, 25b (i.e.,closer to the rearward end of the tool holder 10), and a root 24c,25c between the surfaces 24a, 24b and 25a, 25b having a minimumradius of about 0.002 inches (0.05mm) (Fig. 3). The radius of theroots 24c, 25c is effective for reducing stresses on the cutting insert10. In the illustrated cutting insert 22, the roots 24c, 25c arelocated along a plane 27 that is generally parallel to the Y-axis (i.e.,perpendicular to the X-axis), as shown in FIG. 3. It will beappreciated that the cutting insert is not limited to two notches, butcould also have more notches, so long as the additional number ofnotches does not effect the structural integrity of the cutting insert22. An optional seat member 26 can be disposed between thecutting insert 22 and the bottom 18 of the pocket 14 for supportingthe cutting insert 22 when mounted in the pocket 14.
    [20] [00020]
    [21] [00021]
    [22] [00022] 22 can be disposed on the bottom 18 of the pocket 14 without theuse of the seat member 26 and the head screw 32. In thisaltemative embodiment, it is not necessary to include the threadedbore 28 in the tool holder body 12.
    [23] [00023]
    [24] [00024] approximately equal to angle 68. As a result, the central axes 66,72 of the clamp-securing bore 36 and the pin-receiving bore 38 donot intersect one another. However, in another embodiment, theangle 74 could be different than angle 68 such that the central axes66, 72 would intersect one another.
    [25] [00025]
    [26] [00026]
    [27] [00027] As shown in Fig. 6 another aspect of the invention is that only theforward lower face 46a of the nose portion 46 of the clamp 40contacts the top surface 23 of the insert 22 when the clamp 40 isbrought into pressing engagement with the insert 22. In otherwords the forward lower face 46a forrns an angle 80 with respect tothe top surface 23 of the insert 22 when the clamp 40 is broughtinto pressing engagement with the insert 22. Yet another aspect ofthe invention is that only the forward lower face 53a of the clampscrew 52 engages the top surface 40a of the clamp 40 to furtherbring the nubs 48, 49 and the forward lower portion 46a of theclamp 40 into pressing engagement with the insert 22. In otherwords the forward lower face 53a forrns an angle 82 with respect tothe top surface 40a of the clamp 40 when the clamp 40 is broughtinto pressing engagement with the insert 22.
    [28] [00028]
    [29] [00029] However, the inclined surface 50 is formed at an angle 37 withrespect to the central axis 66 of the clamp-receiving bore 36 that isslightly different than the angle 35 of the inclined surface 34 of thetool holder l0. In an embodiment, the angle 37 is about 24degrees. As seen in Fig. 6, this difference between the angles 35,37 causes the clamp 40 to pivot about a pivot point 39 when thetool holder 10 is moved from the unclamped position to theclamped position. In the illustrated embodiment, the pivot point 39is located at the intersection between the upper surface 16 and theinclined surface 34 of the tool holder l0. This pivoting action ofthe clamp 40 causes the clamp 40 to further exert a force downwardand rearward when bringing the clamp 40 into pressingengagement with the insert 22, thereby enhancing the “pull back”feature of the invention.
    [30] [00030]
    [31] [00031] longitudinal axis, but does not allow as much movementperpendicular to the longitudinal axis. A guide pin 60 is disposedwithin the pin-receiving bore 38 and the pin-receiving slot 63 toprevent the clamp 40 from spinning or twisting in a circumferentialdirection (in a direction perpendicular to the direction of travel ofthe clamp screw 52) when turning of the clamp screw 52 to loosenor tighten the clamp 40. Although the guide pin 60 can be forrnedof a solid pin, the guide pin 60 is preferably formed of a slottedspring pin that can flex, expand or compress to allow for variationsin design and wear of the tool holder l0. Specifically, the slottedspring pin 60 can flex to maintain the relative positions of theaperture 44, the bore 36, the pin-receiving bore 38 of the tool body12 and the pin-receiving slot 63 of the clamp 40 to compensate forchanges in the relative angle of the axes 66, 72 of the bores 36, 38,respectively, that may result due to manufacturing tolerances andwear of the tool body l2 and the clamp 40 (i.e., alignment creep).The guide pin 60 can be press fit into the pin-receiving bore 38 ofthe tool holder body l2. The length of the guide pin 60 is selectedto allow the clamp 40 to move away from the insert 22 whilepreventing the clamp 40 from spinning or twisting in thecircumferential direction.
    [32] [00032]
    [33] [00033]
    [34] [00034] portion 53 includes a lower face 53a that is substantiallyperpendicular to the central axis 66 of the clamp-receiving bore 36.However, the top surface 40a of the clamp 40 forrns an angle withrespect to the lower face 53a when the tool holder 10 is placed inthe clamped position. As a result, only the front portion of thelower face 53a engages the top surface 40a of the clamp 40 whenthe tool holder l0 is brought into the clamped position.
    [35] [00035]
    [36] [00036]
    [37] [00037]
    [38] [00038] As the clamp 40 is fiarther tightened by turning the clamp screw 52,the rearward surfaces 48b, 49b of the nubs 48, 49 positively engagethe rearward surfaces 24b, 25b of the notches 24, 25 of the insert22. In addition, only the forward lower face 46a of the noseportion 46 engages the top surface 23 of the insert 22 when in theclamped position. It is noted that the forward lower face 40b of theclamp 40 does not engage the insert 22 because the lower face 40bis higher in elevation than the lower face 46a of the nose portion 46of the clamp 40. In other words, the forward lower face 46a forrnsan angle 80 with respect to the top surface 23 of the insert 22 whenthe clamp 40 is brought into pressing engagement with the insert 22(Fig. 6).
    [39] [00039]
    [40] [00040] insert requires less material than a conventional insert With thesame geometric shape. That is, a “dogbone” diamond-shapedinsert has less material than a diamond-shaped insert of the samesize. Further, the tool holder 10 offers better rigidity than theconventional tool holder as it is clamped on the sides as Well as thetop of the cutting insert. Even further, the cost/pricecompetitiveness can be realized in conventional tool ho ldersbecause the “dogbone” cutting insert 22 and the clamp 40 of thetool holder 10 can be retrof1t into the some conventional clampingtool holders, such as those described in U.S. Patent Nos. 6,457,914and 7,547,163.
    The patents and publications referred to herein are herebyincorporated by reference.
    Having described presently preferred embodiments the inventionmay be otherwise embodied Within the scope of the appended claims. 12
    权利要求:
    Claims (12)
    [1] 1. l. A tool holder for clan1ping a cutting insert having a pair of notches,the tool holder coniprising: a tool holder body including an insert-receiving pocket forrned at aforward end thereof and having a bottom and at least one side wall for receivingthe insert; a clan1p arranged on the tool holder body, the clan1p including a topsurface, a forward lower face and a rearward lower face, and an aperture forrnedtherethrough, the clan1p including a nose portion with a pair of downwardextending nubs; and a clan1p screw capable of being inserted through the aperture of theclan1p and at least partially received in a clan1p-securing bore of the tool holderbody to bring the clan1p into pressing engagenient with the insert, wherein the pair of nubs of the clan1p engage the pair of notches in thecutting insert when the clan1p is brought into pressing engagenient with the insert,thereby securely clan1ping the cutting insert in the insert-receiving pocket of the tool holder.
    [2] 2. The tool holder according to Claini l, wherein each nub of theclan1p has a forward surface and a rearward surface, and wherein each notch of theinsert has a forward surface and a rearward surface, and wherein the rearwardsurface of each nub engages the rearward surface of each notch when the clan1p is brought into pressing engagenient with the insert.
    [3] 3. The tool holder according to Claini 1, wherein the tool holder bodyincludes an inclined surface having a prescribed angle with respect to the centralaxis of the clan1p-securing bore, and wherein the clan1p fiarther includes aninclined surface forrned at a different prescribed angle than the prescribed angle ofthe inclined surface of the tool holder body, thereby causing the clan1p to pivotabout a pivot point when the clan1p is brought into pressing engagenient with the insert. 13
    [4] 4. The tool holder according to Claim 1, wherein the tool holder bodyalso includes a pin-receiving bore having a central axis formed at an angle with respect to the plane of the tool holder body.
    [5] 5. The tool holder according to Claim 4, wherein the central axis ofthe pin-receiving bore is substantially parallel to the central axis of the clamp- securing bore.
    [6] 6. The tool holder according to Claim 1, wherein the aperture of theclamp is oblong-shaped to allow movement of the clamp along its longitudinal axis.
    [7] 7. The tool holder according to Claim 1, wherein the clamp screw further includes a head portion, a shoulder and a threaded portion.
    [8] 8. The tool holder according to Claim 7, wherein the head portionincludes a lower face that forms an angle with respect to the top surface of the clamp when the clamp is brought into pressing engagement with the insert.
    [9] 9. A cutting insert for a tool holder comprising a pair of notchesformed in the insert, each notch having a forward surface, a rearward surface and root therebetween, each root having a minimum radius.
    [10] 10. The cutting insert according to Claim 9, wherein the minimum radius is 0.002 inches.
    [11] 11. The cutting insert according to Claim 9, wherein each notch engagea rearward surface of a respective nub on a clamp of the tool holder when theclamp is brought into pressing engagement with the insert, thereby securely clamping the cutting insert in an insert-receiving pocket of the tool holder. 14
    [12] 12. A method of clamping a cutting insert to a tool holder, the insertincluding a pair of notches, the tool holder including a clamp having a pair of nubsextending doWnWard from a nose portion, the method comprising the steps of: placing the cutting insert Within an insert-receiving pocket of thetool holder; aligning an aperture of the clamp With a clamp-securing bore of thetool holder; and inserting a clamp screw into the aperture of the clamp such that theclamp screw is at least partially received in the clamp-securing bore of the toolholder to bring the clamp into pressing engagement With the insert, Wherein the pair of nubs of the clamp engage the pair of notches in thecutting insert When the clamp is brought into pressing engagement With the insert,thereby securely clamping the cutting insert in the insert-receiving pocket of the tool holder.
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    同族专利:
    公开号 | 公开日
    KR20130094737A|2013-08-26|
    DE102013101102B4|2021-01-07|
    DE102013101102A1|2013-08-22|
    US20130216320A1|2013-08-22|
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    法律状态:
    2015-09-22| NAV| Patent application has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    US13/398,286|US8727674B2|2012-02-16|2012-02-16|Tool holder with nubs for clamping a cutting insert with notches|
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