• 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:
    1/1 summary "corner radius end mill" a corner radius end mill (10) includes a combined toothed notch (40) extending along a cutting edge (44). the combined toothed notch (40) is formed in a corner sector of the end mill. the combined toothed notch (40) extends from a first end such that it leaves more than half of the corner radius cutting edge (44) of the toothed notch (r). the combined toothed notch (40) merges an extreme toothed notch surface (66) and the sloping incline surface (48) of the corner radius end mill (10).
    公开号:BR112015010820B1
    申请号:R112015010820-2
    申请日:2013-11-05
    公开日:2020-08-04
    发明作者:Eliyahu Budda；Alexander Khina
    申请人:Iscar Ltd；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The subject of the present application refers to corner radius end mills for machining workpieces and in particular to corner radius end mills of the type that has both an extreme toothed notch and a combined toothed notch. BACKGROUND OF THE INVENTION
    [002] Types of endmills include, spherical, square and corner radius, with the subject of the present application referring to the latter type.
    [003] A corner radius end mill is usually formed with an extreme notched notch and, to prevent unacceptable discontinuities, it can be formed with a so-called combined notch.
    [004] Exemplary end mill publications describing combined toothed notches are described in National Aerospace Standard 986 (1973; sheet # 55) and US 2011/0217132.
    [005] It is an object of the present invention to provide a new and improved corner radius end mill. SUMMARY OF THE INVENTION
    [006] According to a first aspect of the subject matter of the present application, a corner radius end mill configured to rotate about a geometric axis of rotation (A), comprising: a stem portion; and a cutting portion extending from the shank portion and having a diameter (D); the cutting portion comprising: a helical groove having a helix angle H that satisfies the condition 20 ° <H <60 ° and comprising a sloping slope surface; a cutting tooth comprising a cutting edge that extends adjacent the groove sloping surface and comprising a corner sector with a corner radius R that satisfies condition R> 0.15D, a first semi-sector of the corner sector extending from an imaginary bisector line of the corner sector to a radial tangent point and a second semi-sector of the corner sector extending from the imaginary bisector line to an axial tangent point, the first and the second semi- sectors subtending equal angles around the imaginary bisector line; an extreme serrated notch surface extending adjacent the cutting edge and the sloping slope surface; and a combined toothed notch extending along the cutting edge from a first end located in the second half-sector in a direction away from the first half-sector and merging the extreme toothed notch surface and the surface slope inclination.
    [007] According to another aspect of the subject matter of the present application, a corner radius end mill is provided comprising a combined toothed notch extending along the cutting edge, the combined toothed notch comprising a first end located on the second semi-sector and extending in a direction moving away from the first semi-sector to merge an extreme notched notch surface and a sloped incline surface.
    [008] According to yet another aspect of the subject matter of the present application, a corner radius end mill is provided comprising a combined toothed notch extending along the cutting edge, the combined toothed notch comprising a first end located on the second semi-sector and extending in a direction away from the first semi-sector to merge an extreme notch notch surface and a sloping slope surface, the combined notch extending to a second end which is spaced from an imaginary axial line and the second semi-sector.
    [009] In accordance with yet another aspect of the subject matter of the present application, a corner radius end mill is configured to rotate about the geometric axis of rotation (A), comprising: a stem portion; and a cutting portion extending from the shank portion and having a diameter (D); the cutting portion comprising: a helical groove having a helix angle H that satisfies the condition 20 ° <H <60 ° and comprising a sloping slope surface; a cutting tooth comprising a cutting edge that extends adjacent the groove sloping surface and comprising a corner sector with a corner radius R that satisfies the condition R> 0.15D, a first semi-sector of the corner sector extending from an imaginary bisector line of the corner sector to a radial tangent point and a second semi-sector of the corner sector extending from an imaginary bisector line to an axial tangent point, the first and second semi -sectors subtending equal angles around the imaginary bisector line; an extreme serrated notch surface extending adjacent the cutting edge and the sloping slope surface; and a combined toothed notch extending along the cutting edge from a first end located in the second half-sector in a direction away from the first half-sector and merging the extreme toothed notch surface and the surface slope inclination; the combined toothed notch extending to a second end that is spaced from an imaginary axial line and the second half-sector.
    [0010] It was found that spacing the second end from the imaginary axial line and the second auxiliary semi-sector significantly in reducing the size of the combined toothed notch. More precisely, the first end of the combined toothed notch can be located closer to the imaginary axial line when the second end is spaced from the imaginary axial line and the second semi-sector.
    [0011] According to yet another aspect of the subject matter of the present application, a corner radius end mill is provided comprising a combined toothed notch which is spaced from a radial tangent point by a predetermined distance.
    [0012] In accordance with yet another aspect of the subject matter of the present application, a method of opening a toothed notch in a corner radius end mill is provided, comprising a step of providing a combined toothed notch over a radius end mill corner that extends in one direction to an axial tangent point from a predetermined point spaced from a radial tangent point.
    [0013] It will be understood that the above is a summary and that any of the above aspects may still comprise any of the characteristics described below. Specifically, the following characteristics, either alone or in combination, can be applicable to any of the above aspects: A. The corner radius end mill can be configured to rotate about a geometric axis of rotation (AR). B. The corner radius end mill can comprise a shank portion and a cutting portion extending from the shank portion and having a DC diameter. A cutting portion can comprise a helical groove having a helix angle H that satisfies the condition 20 ° <H <60 °. In some preferred embodiments, the helix angle H satisfies the condition 35 ° <H <45 °. D. An HR helix range of all the teeth on the corner radius end mill can be equal to or less than two degrees multiplied by the number of Z teeth (HR range <2Z). E. A cutting portion may comprise a groove sloping surface. F. A cutting tooth may comprise a cutting edge that extends adjacent to a groove sloping surface. G. A cutting tooth may comprise a corner sector with a corner radius R. In some preferred embodiments, the corner radius R can satisfy condition R> 0.15D. H. A first semi-sector of a corner sector can extend from an imaginary bisector line to a radial tangent point and a second semi-sector of the corner sector can extend from an imaginary bisector line to a tangent point axial. Put differently, a corner sector can comprise a first semi-sector and a second semi-sector, the first semi-sector extending from an imaginary bisector line from the corner sector to an imaginary radial line extending from from a sector center point to a radial tangent point and the second semi-sector extending from the imaginary bisector line to an imaginary axial line extending from the sector center point to an axial tangent point. I. No portion of the combined toothed notch is in the first semi-sector. J. An extreme toothed notch surface can extend adjacent the cutting edge and the sloping incline surface K. A combined toothed notch can extend along a cutting edge from a first end located on a second semi -sector in a direction moving away from a first semi-sector and merging an extreme toothed notch surface and a sloping slope surface. L. A combined toothed notch may extend to a second end that is spaced from an imaginary axial line and from the second semi-sector, the imaginary axial line extending from a sector center point to the axial tangent point. In other words, the second end may be located on the opposite side of the imaginary axial line from the second semisector. This positioning has been found to reduce the discontinuity formed at the second end. M. To assist in defining the preferred position of the second end, an imaginary end line can be used. The second end may be located along the imaginary end line, which extends from the center point of the sector to the cutting edge. The imaginary end line makes an acute end angle (α3 with the imaginary axial line. It has been found to be advantageous for reducing discontinuity, when the second end is positioned in such a way that the α3 end angle satisfies the condition (3rd < α3 <30 °) An additional reduction in discontinuity can be obtained with the end angle «3 satisfying the condition (5o <α3 <20 °). Best results were obtained with the second end positioned in such a way that the end angle c3 satisfies the condition (6o <α3 <12 °). Said differently, when the angle of the end a tends to 9 it is verified that the size of the discontinuity is advantageously small. N. A second semisector can comprise a transversal subsector having a transverse central angle O. A transverse subsector can be located distally from a first semi-sector and in which the combined notch extends to the second semi-sector crossing the subsector tr ansversal. P. For some preferred embodiments, the central transverse angle can be 10 °. In other preferred embodiments, the central transverse angle can be 25 °. Q. A second semi-sector can comprise a contour subsector having a central contour angle. The contour subsector can extend from an imaginary bisector line. The combined toothed notch does not extend into the contour subsector. A. For some preferred embodiments, the central contour angle can be Io. In other preferred embodiments, the central contour angle can be 2 °. S. The corner radius end mill can comprise a discontinuity formed at an intersection of the cutting edge and the combined toothed notch and the groove sloping surface is located on said axial side. More precisely, the discontinuity can make a discontinuity angle of at least Io. In some preferred embodiments the discontinuity makes a discontinuity angle of at least 2 °. Preferably, the discontinuity makes a discontinuity angle of at most 10 °. Even more preferably, the discontinuity makes a discontinuity angle of at most 6 °. T. Preferably, an angle of radial tilt over an entire radial portion of a cutting edge can have positive values. In some preferred embodiments, all the values of the radial tilt angle can be equal to or greater than 5 ° and, for particularly preferred embodiments, preferably equal to or greater than 8 °. U. The corner radius end mill can be configured to cut workpiece materials having a Rockwell hardness of less than 42 HRc. For example, this configuration can be a radial inclination angle equal to or greater than 5o or 8o etc. V. The corner radius end mill can comprise at least one additional helical groove and associated cutting tooth comprising a combined serrated notch. The combined toothed notch can be as defined with any of the features mentioned here above or below. The streak can be as defined with any of the features mentioned here above or below. Preferably each helical groove and cutting tooth of the corner radius end mill are defined with one or more of the characteristics mentioned here above or below. W. In some preferred embodiments, on the extreme cutting face, the corner radius end mill may have at least one alignment angle having a different value than at least one other alignment angle thereof. In particularly preferred embodiments, on the extreme cutting face, all the alignment angles of the corner radius end mill may have different values. X. In some preferred embodiments, in a plane of equal alignment angle perpendicular to a geometric axis of rotation (AR), the corner radius end mill can have all the same alignment angles. In particularly preferred embodiments, the plane of equal alignment angle may be located in the middle of an active cutting portion of the cutting portion. The plane of equal alignment angle may be the only plane in which all alignment angles are equal. Y. The corner radius end mill can be produced by forming an extreme toothed notch at one end of it and then forming a combined toothed notch that merges an extreme toothed notch surface and an associated groove slope surface. Z. A corner area without a toothed notch of the corner sector on the cutting edge, which is closer than a toothed notch combined with a radial tangent point, can have an angle of inclination at least 5o greater than an angle of inclination of the combined toothed notch on the cutting edge. The corner area without a notched notch may be in the contour subsector of the second semi-sector.
    [0014] It has been found that by providing a corner radius end mill, particularly one with one or more of the characteristics described above, with a combined toothed notch, it is possible to machine a workpiece with less energy consumption and reduced vibrations.
    [0015] While specific features described above can highlight such advantages, without being limited to theory w, it is believed that by limiting an extension of a combined toothed notch, a comparatively larger percentage of the cutting edge can be formed with value slope angles relatively high positive (eg angles of 5o and more), thereby reducing the power to machine a workpiece.
    [0016] The use of high positive value inclination angles has been found to be particularly beneficial for machining relatively soft materials (eg having a Rockwell hardness less than 42 HRc, for example aluminum, stainless steel, plastic, composite materials, CFRP carbon fiber reinforced polymer).
    [0017] However in theory, it is believed that such advantages may even be possible for harder materials (ie having a Rockwell hardness of 42 HRc or more) because an effective cutting length of the cutting edge can still be increased.
    [0018] Surprisingly, the benefits of reduced power and reduced vibrations have displaced the potential difficulties of producing a smooth or tangential corner edge at an intersection of a cutting edge, a combined notch and the groove slope surface. Even in cases where a discontinuity (that is, a point where a function is not continuous) is formed, it has surprisingly been found that an appropriate finish that can be obtained is formed at such an intersection (such discontinuity being small enough so as not to form a visual difference between surface textures on a workpiece, which are not allowed in some industries such as the aerospace industry). BRIEF DESCRIPTION OF THE DRAWINGS
    [0019] For a better understanding of the subject of this application and to show how it can be put into practice, reference will now be made to the accompanying drawings in which: Fig. 1 is a side view of a radius end mill corner with a toothed notch combined according to an embodiment of the present invention.
    [0020] Fig-2A is a partial side view of a cut portion of a end mill without a combined notch.
    [0021] Fig-2B is a partial side view of a cutting portion of a end mill with a combined toothed notch from the prior art.
    [0022] Fig-2C is a partial side view of a cut portion of the end mill in Fig-1 •
    [0023] Fig. 3A is an enlarged view of a corner of the end mill in Fig. 2A.
    [0024] Fig. 3B is an enlarged view of a corner of the end mill in Fig. 2B.
    [0025] Fig. 3C is an enlarged view of a corner of the end mill in Fig. 2C.
    [0026] Fig. 3D shows an overlap of the corner in Fig. 3B and the corner of Fig. 3A, the latter being shown in broken broken lines.
    [0027] Fig-3E shows an overlap of the corner in Fig-3C and the A A the latter being shown in dashed lines
    [0028] Fig. 4A is an extreme view of the end mill in Fig. 2A.
    [0029] Fig. 4B is an extreme view of the end mill in Fig. 2B.
    [0030] Fig. 4C is an extreme view of the end mill in Fig. 2C.
    [0031] Fig. 5 is an enlarged and exaggerated view of a corner portion of the end mill in Fig. 4C.
    [0032] Fig-6A is an enlarged and exaggerated cross-sectional view taken along a portion of line 6A-6A in Fig. 3C.
    [0033] Fig-6B is an enlarged and exaggerated cross-sectional view taken along a portion of line 6B-6B in Fig. 3C. DETAILED DESCRIPTION
    [0034] Reference is made to Fig. 1, which illustrates a corner radius end mill 10, typically made of extremely hard and wear-resistant material such as cemented carbide and configured to rotate around a geometric axis of rotation ( AR) extending longitudinally through its center in a counterclockwise direction in the view shown in Fig. 4C.
    [0035] The end mill 10 comprises a shank portion 12 and a cutting portion 14 extending therefrom.
    [0036] The shank portion 12 can comprise a cylindrical shank portion 16 and a tapered shank portion 18 that extends between and has its diameter reduced from the cylindrical shank portion 16 and the cutting portion 14.
    [0037] The cutting portion 14 comprises a splined cutting portion 20 extending along the geometric axis of rotation AR in an axial direction to the rear DR from an extreme cutting face 22 located at an axial end 24 of the milling cutter top 10.
    [0038] The cutting portion 14 may also comprise a neck cutting portion 26 extending from the grooved cutting portion 20, or more precisely from the ends 28 of the groove, to the shank portion 12.
    [0039] A diameter D of the cutting portion can be measured between imaginary peripheral extension lines 30, 32 on the extreme cutting face 22. Although in this non-limiting example the extension lines 30, 32 are parallel to each other, due to the shape cylindrical of the grooved cut portion 20 in some embodiments they do not need to be parallel (for example on a end mill having a conical shaped grooved cut portion (not shown) the extension lines can tend towards each other as they meet approach their axial end). In the present non-limiting example, the diameter D of the cutting portion is 16 mm.
    [0040] With reference to Figs. 2C and 4C, the grooved cutting portion 20 comprises at least one helical groove (34A, 36A, 38A) and an associated cutting tooth (34B, 36B, 38B) extending adjacent to it
    [0041] In general, it is preferable that each cutting tooth (34B, 36B, 38B) of the cutting portion 14 is of the type to be formed with a combined toothed notch 40, that is, extending from the axial end 24 towards and along the periphery 42 of the end mill (Fig. 2C).
    [0042] Alternatively to the non-limiting example shown, some end mill modes may have one or more, or all, of their cutting edges 44 formed along the periphery 42 with varying radial tilt angles (not constant tilt angles) ).
    [0043] In general, it is preferable that each helical groove (34A, 36A, 38A) can have a helix angle H (Fig. 2C). A combined toothed notch 40 of the material of the present application has been found to improve the performance of endmills. More precisely, this improvement was found specifically for grooved endmills having a helix angle H satisfying the condition 20 ° <H <60 °.
    [0044] In the non-limiting example shown, the helical groove designated as 34A has a helix angle of 41 °, the helical groove 36A has a helix angle of 40 ° and the helical groove 38A has a helix angle of 39 °.
    [0045] Alternatively to the non-limiting example shown, some end mill modalities can have one or more, or all, of the grooves formed with a variable helix angle groove (not shown), all values of each variable helix angle H of each groove must remain within the aforementioned range of helix angle of 20 ° <H <60 °.
    [0046] It is preferable to minimize the difference in magnitude between the propeller angles, which has been found to increase the depth of cut by even twice the diameter of the end mill. For elaboration, it is preferred that the total difference between the helix angles of the teeth (below the "helix range HR") is equal to or less than two degrees multiplied by the number of teeth Z (helix range HR <2Z). For example, for a three-tooth end mill, it is preferred that the difference is not more than 6 ° (for example, a first helix angle can be 38 °, a second 40 ° and a third 42 °). Superior performance can be found as the HR propeller range decreases. For example the example illustrated in Fig. 2C has a 2nd helix range (39 ° to 41 °) which is believed to work better than an HR helix range. However, it is preferable that at least one, or preferably all, the helix values of the different grooves will differ slightly, to reduce squeak.
    [0047] Reverting to Fig. 1, it will be understood that an effective cutting length L of the cutting portion 14 extends from the extreme cutting face 22 to a cutting length plane Pc extending perpendicular to the geometric axis (AR) and located where at least one helical groove (34A, 36A, 38A) begins to come out (ie, become shallower) and / or a point 46 at which a raised surface of the cutter tooth associated cutting top 10 is no longer effective.
    [0048] It was also found that a combined toothed notch 40 of the material of the present application was particularly efficient for endmills with a plane of alignment angle equal to PE perpendicular to a geometric axis of rotation AR, in which all alignment angles of a end mill are the same. It was found that the plane of equal alignment angle PE has superior results when it is located in the middle of an active cutting portion of the cutting portion 14, that is, an equal distance L / 2 from the extreme cutting face 22 and the cutting length plane Pc.
    [0049] The angles of alignment in planes parallel to, but distinct from, the plane of equal alignment angle may be different. In the non-limiting example shown, the alignment angles (ε1; ε2, ε3; Fig. 4A) on the extreme cutting face are all different (for example, ε1 = 120 °, ε2 = 115 ° and ε3 = 125 °).
    [0050] It will be understood that each (that is, all) cutting tooth (34B, 36B, 38B) and helical groove (34A, 36A, 38A) of the exemplified top 10 cutter has the characteristics described below, however this description, for the sake of simplicity only, it will only be detailed with respect to the helical groove and cutting tooth designated as 34A and 34B.
    [0051] It will be understood that in addition to the type of cutting tooth described, which starts from an axial end of a end mill and comprises a corner radius, some modalities may also comprise one or more additional cutting teeth that are extend in a backward direction from a location spaced from the axial end (not shown).
    [0052] With reference to Figs. 2C, 3C and 4C, the cutting tooth 34B comprises a cutting edge 44 formed at an intersection of the raised surface of the tooth 46 (Fig. 4C) and a sloping slope surface 48 (Fig. 2C) and also comprises a corner sector 50 with a corner radius R and a center point of sector 52.
    [0053] The corner radius R is measurable as known in the art (ie it can be measured by rotating a end mill in front of circles of different sizes (not shown) around the geometric axis of rotation AR, up to that one of the circles having a corresponding curvature is found - that is, during said rotation, a portion of the corner of the end mill will match a portion of a circle of corresponding size). Alternatively to the example shown, some modalities may have a corner sector extending by an amount other than a quarter of a circle.
    [0054] With reference to Fig. 2C, a corner radius center angle 54 that extends between an imaginary axial line 56 (extending from the center point of sector 52 to an axial tangent point 58) and a imaginary radial line 60 (extending from the center point of sector 52 to a radial tangent point 62), can be an angle other than 90 °, which is the angle in the present non-limiting example.
    [0055] A radial tangent point 62 is one of two extreme points of the corner sector 50 (corresponding to the circle of corresponding size) on the periphery 42 of the end mill 10 and an axial tangent point 58 is the other extreme point on the other side of the corner sector 50, that is, at the axial end 24 of the corner sector 50.
    [0056] In the present non-limiting example, the corner radius R is 4 mm. In other words the corner radius R is 0.25D (as mentioned above the diameter D of the cutting portion is 16 mm).
    [0057] It was found that a combined toothed notch of the material of the present application improves the performance of endmills that satisfy the condition R> 0.15D.
    [0058] During its production, the end mill 10 first has an open toothed notch with an extreme toothed notch 64 (see Fig. 2A which does not comprise a combined toothed notch) at the axial end 24. The top cutter 10 is subsequently formed with a combined toothed notch 40 (Fig. 2C).
    [0059] With reference to Figs. 2A, 3A and 4A, showing the end mill 10 after the first extreme notch formation step but before the combined notch 40 is formed, the extreme notch 64 comprises an end notch surface 66 extending adjacent to the cutting edge 44 and the spline slope surface 48. An undesirable living discontinuity 68 (Figs. 3A and 4A) is located at an intersection of the cutting edge 44, the toothed notch 66 and the slope surface of groove 48. The extreme tooth notch formation step results in an original contour 66a of the tooth notch (Fig. 3A) between the extreme tooth notch surface 66 and the slope slope surface 48, the original contour 66a of the tooth notch extending up to live discontinuity 68.
    [0060] To remove the live discontinuity 68, the combined toothed notch 40 is provided on the end mill shown in Figs. 2A, 3A and 4A, resulting in the end mill 10 shown in Figs. 2C, 3C and 4C. The combined toothed notch 40 extends along the cutting edge 44 and merges the extreme toothed notch surface 66 and the ridge inclined surface 48.
    [0061] For understanding, Figs. 2B and 3B show a 10 'end mill with a combined toothed notch 40' of the prior art, which extends from an axial tangent point 58 'completely to a radial tangent point 62'.
    [0062] Figs. 2C and 3C show an example of a combined toothed notch 40 according to the subject of the present application, which is shown to end at a first end 70 which is spaced from the radial tangent point 62.
    [0063] Fig. 3D shows an overlap of Fig. 3B over Fig. 3A and Fig. 3E shows an overlap of Fig. 3C over Fig. 3A. Both Figs. 3D and 3E show in broken dashed lines the original contour 66a of the toothed notch, a cutting edge portion removed 44a and the live discontinuity removed 68. Thus, Fig. 3D shows an overlap of the cutting portion of the end mill of Fig 3B having the prior art combined toothed notch on the cutting portion of the end mill of Fig. 3A which does not have a combined toothed notch. Similarly, Fig. 3E shows an overlap of the cutting portion of the end mill of Fig. 3C having the toothed notch combined according to the subject of the present application on the cutting portion of the end mill of Fig. 3A which has no a combined toothed notch. Comparing Figs. 3D and 3E, it can be seen that the subject matter of the present application has a toothed notch combined with considerably less surface area than the combined toothed notch of the prior art. It is also shown that the combined toothed notch of the present application leaves much more of the cutting edge 44 free of toothed notch when compared to a toothed notch 40 'of the prior art that extends to the radial tangent point 62'.
    [0064] FIG. 6A shows a straight section along an imaginary cross line 76 (Fig. 3C) that passes through the combined toothed notch 40. In contrast, Fig. 6B shows a straight section along an imaginary line 74 that does not pass through the combined toothed notch 40. The imaginary line 74 chosen for this explanation is bisector line 74 but it could also be chosen in different positions by not going through the combined toothed notch 40. Limiting or minimizing the length of the combined toothed notch 40 in a direction to the radial tangent point 62, a corner area 72 (Fig. 3C) extending between the radial tangent point 62 and the first end 70, you can have a corner angle or angles of corner β1 (that is, the angle or inclination angles in the corner area without notch 72, shown here, for example, along a bisector line 74) of a value or positive values higher than an angle or inclination angles β2 of notched notch swimming of the combined toothed notch 40 (i.e., the inclination angle β2 in the combined toothed notch 40, shown here, for example, along an imaginary transverse line 76; noting that the inclination angle β2 of the toothed notch combined can still be a positive value or positive values, as in the present example, although of less magnitude than the angle or angles of corner inclination).
    [0065] Preferably, the corner area without angle or angle of inclination of corner β1 of toothed notch may be at least 5o greater than the angle of inclination β2 of the combined toothed notch 40.
    [0066] To elaborate, with reference to Fig. 3C, the corner sector 50 can be divided into a first semi-sector 78 and a second semi-sector 80.
    [0067] The first semi-sector 78 can extend from the imaginary bisector line 74 (which extends from the center point of sector 52 to the cutting edge 44 and makes an angle of equal magnitude with the axial line 56 and the radial line 60) to the radial line 60.
    [0068] The second semi-sector 80 can extend from the imaginary bisector line 74 to the axial line 56. Thus, the first and second semi-sectors 78, 80 subtend equal angles within the corner sector 50, around of the imaginary bisector line 74.
    [0069] In general terms, no portion of the combined notch 40 is within the first semi-sector 78 and thus the first semi-sector 78 is exempt from any of the combined notch 40.
    [0070] The second semi-sector 80 can comprise a transversal subsector 82, a contour subsector 84 and a central subsector 88 delimited by the transversal subsector 82 and by the contour subsector 84.
    [0071] The transverse subsector 82 is distally located from the first semi-sector 78. The transverse subsector 82 has a central transverse angle OCi formed between the axial line 56 and a transverse line 76 that extends from the center point of the sector 52 to the cutting edge 44.
    [0072] The contour subsector 84 is immediately adjacent to the first sector 78. The contour subsector 84 has a central contour angle 0í2 formed between bisector line 74 and an imaginary contour line 86 that extends from the center point of the sector 52 to the cutting edge 44.
    [0073] No portion of the combined notch 40 is found in the contour subsector 84. The combined notch 40 crosses the transverse subsector 82 and the first end 70 of the combined notch 40 is located in a central subsector 88. It will be understood that the transverse central angle OCi is consequently less than an angle (not shown) formed between axial line 56 and an imaginary line (not shown) extending from the center point of sector 52 to the first end 70.
    [0074] The combined toothed notch 40 can extend to a second end 90 which is spaced from the axial line 56 and the second semi-sector 80. The second end 90 is located at the end of an imaginary end line 91, which extends from the center point of sector 52 to the cutting edge 44. Does the imaginary end line 91 make an acute end angle at with the imaginary axial line 56.
    [0075] As shown in Figs. 3E and 4C, live discontinuity 68 (Fig. 4A) is no longer present, however, with reference now to Fig. 5, a new discontinuity 92 is formed at an intersection of the cutting edge 44, the combined notch 40 and the surface groove slope 48. In other words, the new discontinuity 92 is located at the first end 70 of the combined toothed notch 40. A difference in position can be seen when compared to a discontinuity 92 'of the prior art (Fig. 3B) of the notch 40 'combined toothing of the prior art, which is located on a radial side of a end mill. The new discontinuity 92 can make a new angle of discontinuity I, which is shown in an exaggerated manner in Fig. 5 for ease of understanding.
    [0076] It has been found that the combined toothed notch 40 of the material of the present application, particularly when applied to a end mill having the characteristics described above, can significantly improve the efficiency for machining aluminum.
    [0077] The above description includes an exemplary modification for qualification, if necessary and the claims should not be interpreted as excluding modalities and / or characteristics not exemplified.
    权利要求:
    Claims (15)
    [0001]
    1. Corner radius end mill (10) configured to rotate around a geometric axis of rotation (AR) comprising: a shank portion (12); and a cutting portion (14) extending from the shank portion (12) and having a diameter (D); the cutting portion (14) comprising: a helical groove (34a, 36a, 38A) having a helix angle H that satisfies the condition 20 ° <H <60 ° and comprising a sloping slope surface (48); a cutting tooth (34B, 36B, 38B) comprising a cutting edge (44) which extends adjacent the groove sloping surface (48), and comprising a corner sector (50) with a corner radius R that satisfies the condition R> 0.15D, a first semi-sector (78) of the corner sector (50) extending from an imaginary bisector line (74) of the corner sector (50) to a radial tangent point (62 ) and a second semi-sector (80) from the corner sector (50) extending from the imaginary bisector line (74) to an axial tangent point (58), the first (78) and the second (80) semi -sectors subtending equal angles around the imaginary bisector line (74); an extreme toothed notch surface (66) extending adjacent to the cutting edge (44) and the groove sloping surface (48), characterized by the fact that: a combined toothed notch (40) extending along the cutting edge (44) from a first end located in the second semi-sector (80) in a direction away from the first semi-sector (78), and merging the extreme notched notch surface (66) and the surface slope inclination (48).
    [0002]
    Corner radius end mill (10) according to claim 1, characterized in that the second semi-sector (80) comprises a transverse subsector (82) having a central transverse angle, the transverse subsector (82 ) being located distally from the first semi-sector (78), and in which the combined toothed notch (40) extends to the second semi-sector (80) crossing the transverse subsector (82)
    [0003]
    Corner radius end mill (10) according to either of claims 1 or 2, characterized in that the combined toothed notch (40) extends to a second end (90) which is spaced from an imaginary axial line (56) and the second semi-sector (80), the imaginary axial line (56) extending from a sector center point (52) to the axial tangent point (58).
    [0004]
    Corner radius end mill (10) according to claim 3, characterized in that the second end (90) is located along an imaginary end line extending from the center point of the sector (52) to the cutting edge (44), the imaginary end line forming an acute end angle 0C3 with the imaginary axial line (56) satisfying the condition: 3 ° <α3 <30 °, preferably satisfies the condition: 5o <α3 <20 °, and more preferably it satisfies condition 6o <α3 <12 °.
    [0005]
    Corner radius end mill (10) according to any of claims 2 to 4, characterized in that the central transverse angle is 10 °, preferably the central transverse angle is 25 °.
    [0006]
    Corner radius end mill (10) according to any one of claims 1 to 5, characterized in that the second semi-sector (80) comprises a contour subsector (84) having a central contour angle , the contour subsector (84) extending from the imaginary bisector line, and in which the combined notch (40) does not extend to the contour subsector (84).
    [0007]
    Corner radius end mill (10) according to claim 6, characterized in that the central contour angle is Io or 2o.
    [0008]
    Corner radius end mill (10) according to any one of claims 1 to 7, characterized in that a discontinuity formed at an intersection of the cutting edge (44), the combined notch (40) and of the spline inclination surface (48) is located on the axial side.
    [0009]
    Corner radius end mill (10) according to claim 8, characterized in that the discontinuity forms at least one Io discontinuity angle, or at least a 2 ° discontinuity angle, and / or in that the discontinuity forms at most a 10 ° discontinuity angle, and preferably at most a 6 ° discontinuity angle.
    [0010]
    Corner radius end mill (10) according to any one of claims 1 to 9, characterized in that an angle of radial inclination over a whole radial portion of the cutting edge (44) has positive values.
    [0011]
    Corner radius end mill (10) according to claim 10, characterized in that all the values of the radial inclination angle are equal to or greater than 5o, and preferably are equal to or greater than 8o.
    [0012]
    Corner radius end mill (10) according to any one of claims 1 to 11, characterized in that the helix angle H satisfies the condition 35 ° <H <45 °.
    [0013]
    13. Corner radius end mill (10) according to any one of claims 1 to 12, characterized in that a corner area without serrated notch (72) of the corner sector (50) at the cutting edge ( 44), which is closer than the combined notch (40) to the radial tangent point, has an angle of inclination at least 5 o greater than an angle of inclination of the combined notch (40) at the cutting edge (44) .
    [0014]
    14. Corner radius end mill (10) according to claim 13, characterized in that the corner area without toothed notch (72) is in the contour subsector (84) of the second semi-sector (80) .
    [0015]
    Corner radius end mill (10) according to any one of claims 1 to 14, characterized in that it further comprises at least one additional helical groove and associated cutting tooth comprising a combined notch as defined in any one of claims 1 to 14, and preferably each helical groove and cutting tooth of the corner radius end mill are defined with the characteristics of any one of claims 1 to 14.
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    同族专利:
    公开号 | 公开日
    US20160067796A1|2016-03-10|
    US20140133926A1|2014-05-15|
    RU2635681C2|2017-11-15|
    CA2891296C|2017-10-24|
    PT2919934T|2017-11-22|
    CA2891296A1|2014-05-22|
    US9764395B2|2017-09-19|
    CN104781026B|2017-06-06|
    PL2919934T3|2018-03-30|
    BR112015010820A2|2017-07-11|
    KR101797332B1|2017-11-13|
    RU2015122729A|2017-01-10|
    KR20150082292A|2015-07-15|
    EP2919934B1|2017-11-01|
    EP2919934A1|2015-09-23|
    JP6246825B2|2017-12-13|
    IL238750A|2018-08-30|
    JP2015533666A|2015-11-26|
    US8858128B2|2014-10-14|
    WO2014076691A1|2014-05-22|
    CN104781026A|2015-07-15|
    IL238750D0|2015-06-30|
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    法律状态:
    2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2020-02-11| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-06-23| B09A| Decision: intention to grant|
    2020-08-04| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 05/11/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/676,974|2012-11-14|
    US13/676,974|US8858128B2|2012-11-14|2012-11-14|Corner radius end mill|
    PCT/IL2013/050905|WO2014076691A1|2012-11-14|2013-11-05|Corner radius end mill|
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