WO2018176743A1 - Ball nose cutter - Google Patents

Abstract

A ball nose cutter (10), comprising a shank (11) made of a ceramic material and a cutting part (12). One end of the shank (11) is connected to the cutting part (12). The cutting part (12) comprises helical margins (121). Each margin (121) comprises a peripheral edge (102). A rake angle of the peripheral edge (102) is 4° to 6°. A first relief angle of the peripheral edge (102) is 11° to 13°. A second relief angle of the peripheral edge (102) is 24° to 26°. The ball nose cutter (10) has a high melting point, high hardness, and high wearability, and the service life of the ball nose cutter (10) is prolonged.

Description

 Round nose cutter

 Technical field

 [0001] The present invention relates to the field of machining tools, and more particularly to a round nose cutter.

 Background technique

 [0002] A milling cutter is a rotary cutter having one or more cutter teeth for milling. In the work, each tool cuts the margin of the wages intermittently. Milling cutters are mainly used to machine planes, steps, grooves, forming surfaces and cutting workpieces on a milling machine.

 [0003] The customer has feedback that the existing tungsten steel round nose milling cutter has serious edge wear after processing a section of time, and the tool life is low, which does not meet the customer's demand. In order to improve the tool life, the operator has made various attempts, such as improving the tool structure, optimizing the tool parameters from the design point of view, optimizing the tool's front corner back angle for the tool wear position, and the improvement effect is not obvious; Replace the coating, but the effect is minimal. technical problem

 [0004] It is an object of the present invention to provide a round nose cutter having a high melting point, high hardness, and high wear resistance, which increases the service life of a round nose cutter and can meet customer needs.

 Problem solution

 Technical solution

 [0005] The technical problem of the present invention is solved by the following technical solutions.

 [0006] A round nose cutter comprising a cutter bar made of a ceramic material and a cutting portion, one end of the cutter bar being coupled to the cutting portion, the cutting portion including a spirally disposed land, the land including the peripheral edge, the front edge of the blade The angle is 4°~6°; the first relief angle of the peripheral edge is 11°~13°; the second relief angle of the peripheral edge is 24°~26°.

In a preferred embodiment of the invention, the rake angle of the land is from 29° to 31°.

In a preferred embodiment of the present invention, the land further includes a rake face and a flank face, and the peripheral edge is connected between the rake face and the flank face, and the width of the flank face is 0.55 mm to 0.65. Mm.

In a preferred embodiment of the present invention, the cutting portion further includes a transition portion and an end tooth, the transition portion is connected between the end tooth and the land, the transition portion is curved, and the arc radius of the transition portion is 0.09. Mm~0.11mm.

[0010] In a preferred embodiment of the invention, the transition angle of the transition portion is 6°. [0011] In a preferred embodiment of the present invention, the end tooth includes two long end teeth and two short end teeth, and the two long end teeth are symmetrically disposed along the axis of the cutting portion, and the two short end teeth are along The axis of the cutting portion is symmetrically arranged, and the eccentric distance between the two long end teeth is 0.05 mm to 0.07 mm; the edge inclination angle of the end teeth is 0.5° to 1°.

In a preferred embodiment of the invention, the end face of the long end tooth has a width of 0.18 mm to 0.22 mm.

[0013] In a preferred embodiment of the present invention, the end surface of the cutting portion is provided with two long chip flutes and two short chip flutes, and the long chip flutes and the short chip flutes are respectively located at the long end teeth and short Between the end teeth, the end face of the long chip flute is 0.

6mm to 0.7mm, the end face width of the short chip pocket is 0.3mm~0.4mm.

[0014] In a preferred embodiment of the invention, the angle of the long chip flute is 40°; the angle of the short chip flute is 50°

[0015] In a preferred embodiment of the present invention, the end tooth includes a front end surface, an end edge and a rear end surface, and the end edge is connected between the front end surface and the rear end surface, and the front edge has a rake angle of 5°; The first relief angle is 5°~7°; the second relief angle of the end edge is 17°~19°.

 Advantageous effects of the invention

 Beneficial effect

 [0016] The round nose cutter of the present invention comprises a cutter bar made of a ceramic material and a cutting portion, one end of the cutter bar being connected to the cutting portion, the cutting portion including a spirally disposed land, the blade including a peripheral edge, and a front edge of the blade The angle is 4°~6°; the first relief angle of the peripheral edge is 11°~13°; the second relief angle of the peripheral edge is 24°~26°. The round nose cutter of the invention has high melting point, high hardness and high wear resistance, which increases the service life of the round nose cutter and can meet the needs of customers. Brief description of the drawing

 DRAWINGS

 The above description is only an overview of the technical solutions of the present invention, and the technical means of the present invention can be more clearly understood, and can be implemented in accordance with the contents of the specification, and the above and other objects, features and advantages of the present invention can be further improved. It is obvious that the preferred embodiments are described below in detail with reference to the accompanying drawings.

 [0018] FIG. 1 is a schematic structural view of a round nose cutter of the present invention.

 [0019] FIG. 1b is a schematic view of the measurement of the chip pocket of the round nose tool of the present invention.

 [0020] FIG. 1c is a schematic view of the measured tip edge angle of the round nose cutter of the present invention.

 2 is a cross-sectional structural view of a cutting portion of the present invention.

3 is a partial structural schematic view of the cutting portion of FIG. 2. 4 is a partial schematic view showing a peripheral edge of a cutting portion of the present invention.

 [0024] FIG. 5 is a partial schematic view of a transition portion of the present invention.

 6 is a schematic end view of the cutting portion of the present invention.

 7 is a partial schematic view of the end teeth of the cutting portion of the present invention.

 8 is an enlarged schematic view of the end teeth of FIG. 7.

Embodiments of the invention

 [0028] To further illustrate the technical means and efficacy of the present invention for achieving the intended purpose of the present invention, the specific embodiments, structures, features and features of the round nose cutter according to the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Its efficacy, detailed description is as follows:

 The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. The technical means and functions of the present invention for achieving the intended purpose can be more deeply and specifically understood by the description of the embodiments. However, the drawings are only for reference and description, and are not intended to be used for the present invention. limit.

 [0030] FIG. la is a schematic structural view of a round nose cutter of the present invention. Figure lb is a schematic illustration of the measurement of the chip pocket of the round nose tool of the present invention. Figure lc is a schematic illustration of the measured tip edge angle of the round nose tool of the present invention. As shown in Figs. la, lb and lc, in the present embodiment, the round nose cutter 10 includes a shank 11 and a cutting portion 12 connected to the end of the shank 11. The cutting portion 12 includes four land 121, a transition portion 122 and four end teeth 123. Each land 121 is spirally disposed along the axial direction of the cutting portion 12, and the transition portion 122 is connected between the land and the end teeth, and the end teeth 12 are provided. 3 is symmetrically disposed along the axis of the cutting portion 12. In the present embodiment, the round nose cutter 10 is formed of a ceramic material to form a cutter bar 11 and a cutting portion 12.

 [0031] As shown in FIG. la, the spiral angle oil of each land 121 is 29° to 31°, preferably 30°; the effective blade length W of the cutting portion 12 is 10 mm to 10.3 mm;

2 is a cross-sectional structural view of a cutting portion of the present invention. Fig. 3 is a partial structural schematic view of the cutting portion of Fig. 2; As shown in FIG. 2 and FIG. 3, the land 121 of the cutting portion 12 includes a rake face 101, a peripheral edge 102 and a flank face 103, and the peripheral edge 102 is connected between the rake face 101 and the flank face 103; The rake angle α2 of the blade 102 is 4°~6°, preferably 5°; the first back angle οι3 of the peripheral edge 102 is 11°~13°, preferably 12°; the second rear corner οι4 of the peripheral edge 102 is 24 °~26°, preferably 25°. In the present embodiment, the flank 103 of the land 121 has a width L1 of 0.55 mm~ 0.65 mm, preferably 0.6 mm. As shown in FIG. 2, the core portion D of the cutting portion 12 is 1.75 mm to 1.85 mm, preferably 1.8 mm.

 As shown in FIG. 3, in the present embodiment, the flank 103 of the land 121 includes a first blade surface 103a and a second blade surface 103b. The first blade surface 103a is coupled to the peripheral blade 102 and the second blade. Between the faces 103b, the width L2 of the first blade face 103a is 0.27 mm to 0.33 mm, preferably 0.3 mm.

 4 is a partial schematic view showing a peripheral edge of a cutting portion of the present invention. As shown in Fig. 4, in the present embodiment, the end portion of the peripheral edge 102 of the cutting portion 12 is provided with a facet 104, and the width L3 of the facet 104 is 0.08 mm to 0.12 mm.

 5 is a partial schematic view of a transition portion of the present invention. As shown in FIG. 1 and FIG. 5, in the present embodiment, the transition portion 122 has an arc shape, and the arc radius R of the transition portion 122 is 0.09 mm to 0.11 mm, preferably 0.1 mm; the back angle α5 of the transition portion 122 is 6°.

 6 is a schematic view showing an end face of a cutting portion of the present invention. As shown in FIG. 6, the end tooth 123 includes two long end teeth 123a and two short end teeth 123b. The two long end teeth 123a are symmetrically disposed along the axis of the cutting portion 12, and the two short end teeth 123b are cut along the cutting edge. The axis of the portion 12 is symmetrically arranged. In the present embodiment, the eccentric distance J between the two long end teeth 123a is 0.05 mm to 0.07 mm, preferably 0.06 mm; and the end face width L4 of the long end tooth 123b is 0.18 mm to 0.22 mm.

 [0037] As shown in FIG. 6, the end surface of the cutting portion 12 is provided with two long chip flutes and two short chip flutes, and the long chip flutes and the short chip flutes are respectively located at the long end teeth 123a and the short end teeth 123b. Between the long chip flutes, the end face width L5 is 0.6mm

~0.7mm, the end face width of the short chip pocket L6 is 0.3mm~0.4mm.

7 is a partial schematic view of the end teeth of the cutting portion of the present invention. As shown in FIG. 1b, FIG. 1c and FIG. 7, in the present embodiment, the angle οι6 of the long chip flute is 40°; the angle οι7 of the short chip flute is 50°; the edge inclination angle α8 of the end tooth of the cutting portion is 0.5 ° ~ 1 °.

 8 is an enlarged schematic view of the end teeth of FIG. 7. As shown in Figs. 7 and 8, the end tooth 123 of the cutting portion 12 includes a front end surface 105, an end edge 106 and a rear end surface 107, and the end edge 106 is coupled between the front end surface 105 and the rear end surface 107. The front corner οι9 of the end edge 106 is 5°; the first relief angle ot10 of the end edge 106 is 5°~7°, preferably 6°; the second relief angle l1 of the end edge 106 is 17°~19°, preferably It is 18°. In this embodiment, the rear end surface 107 includes a first end surface 107a and a second end surface 107b. The first end surface 107a is connected between the end edge 106 and the second end surface 107b. The width L7 of the first end surface 107a is 0.27 mm to 0.33. Mm, preferably 0.3 mm.

[0040] The round nose cutter 10 of the present invention comprises a cutter bar 11 made of a ceramic material and a cutting portion 12, one end of the cutter bar 11 Connected to the cutting portion 12, the cutting portion 12 includes a spirally disposed land 121, the land 121 includes a peripheral edge 102, the front corner οι2 of the peripheral edge 102 is 4° to 6°; and the first rear corner οι3 of the peripheral edge 102 is 11 °~13°; the second relief angle 0C4 of the peripheral edge 102 is 24°~26°. The round nose cutter 10 of the present invention has a high melting point, high hardness, and high wear resistance, which increases the service life of the round nose cutter 10 and can meet customer needs.

 The preferred embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the specific details of the embodiments described above, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical idea of the present invention. Simple variations are within the scope of the invention. The specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not be described again in terms of various possible combinations.

Claims

Claim  [Claim 1] A round nose cutter comprising: a shank (11) made of a ceramic material and a cutting portion (12), one end of the shank (11) being connected to the cutting portion (12) The cutting portion (12) includes a spirally disposed land (121), the land (121) including a peripheral edge (102), the front edge of the circumferential edge (102) being 4° to 6°; 102) The first relief angle is 11 ° ~ 13 °; the second relief angle of the peripheral edge (102) is 24 ° ~ 26 °.  [Claim 2] The round nose cutter according to claim 1, wherein the land (121) has a helix angle of 29. ~31. . [Claim 3] The round nose cutter according to claim 1, wherein the land (121) further includes a rake face (101) and a flank face (103), the peripheral edge (102) being connected to Between the rake face (101) and the flank face (103), the width of the flank face (103) is 0.55 mm~0.65 m [Claim 4] The round nose cutter according to claim 1, wherein the cutting portion (12) further includes a transition portion (122) and an end tooth (123), the transition portion (122) being connected to the end portion Between the tooth (123) and the land (121), the transition portion (122) has an arc shape, and the radius of the arc of the transition portion (122) is 0.09 mm to 0.11 mm.  [Claim 5] The round nose cutter according to claim 4, wherein the transition portion (122) has a relief angle of 6. . [Claim 6] The round nose cutter according to claim 4, wherein the end tooth (123) comprises two long end teeth (123a) and two short end teeth (123b), two long end teeth (123a) symmetrically disposed along the axis of the cutting portion (12), the two short end teeth (123b) are symmetrically disposed along the axis of the cutting portion (12), and the eccentricity between the two long end teeth (123a) It is 0.05 mm to 0.07 mm; the edge of the end tooth (123) is 0.5° to 1°.  [Claim 7] The round nose cutter according to claim 6, wherein the end surface of the long end tooth (123) has a width of 0.18 mm to 0.22 mm. [Claim 8] The round nose cutter according to claim 6, wherein the end portion of the cutting portion (12) is provided with two long chip flutes and two short chip flutes, the long chip flute and The short chip flutes are respectively located between the long end teeth (123a) and the short end teeth (123b), and the end faces of the long chip flutes are wide It is 0.6 mm to 0.7 mm, and the end face width of the short chip flute is 0.3 mm to 0.4 mm.  [Claim 9] The round nose cutter according to claim 8, wherein the long chip pocket has an angle of 40°; and the short chip pocket has an angle of 50°. [Claim 10] The round nose cutter according to claim 6, wherein the end tooth (123) comprises a front end face (105), an end edge (106) and a rear end face (107), the end edge (106) Between the front end face (105) and the rear end face (107), the front edge (106) has a rake angle of 5°; the first back corner of the end edge (106) is 5° to 7°; The second relief angle of the end edge (106) is 17. ~19. .