KR0137202B1 - Throw-away tip - Google Patents

Abstract

Improve the machinability of the peripheral cutting edge of the finishing tip.

In the tip 10 which is a quadrilateral flat plate shape, the notched surface 18 which is triangular of the corner part C of the front margin 12 is formed.

An outer circumferential cutting edge 19 is formed at the ridge of the arc-like surface 15 and the notch 18 against the finishing cutting edge 17.

At the time of attachment to the tool body 11, the rake surface can be shared by the finishing cutting blade 17 and the finishing cutting blade 19, and the notch 18 is an outer circumferential surface with respect to the peripheral cutting blade 19. Since the radial inclination angle is smaller than that of the conventional art, the cutting property of the outer peripheral cutting edge 19 is improved.

Description

Drawaway tip

1 is a perspective view of a tip in an embodiment of the present invention.

2 is a side view of the tip.

3 is an arrow view in the direction III of FIG. 2;

4 is an arrow view in the IV direction of FIG.

5 is an arrow view in the direction V of FIG.

6 is a side cross-sectional view of the tool body to which the tip shown in FIG. 1 is attached.

7 is an arrow view in the Ⅶ direction of FIG.

8 is a plan view showing a state in which the tip shown in Figure 1 is attached to the tool body.

9 is an arrow view in the Ⅸ direction of FIG.

10 is a plan view of a conventional tip.

11 is an arrow view in the direction of ⅩI of FIG.

12 is a view showing a state in which the tip shown in FIG. 10 is attached to the tool body

FIG. 13 is an arrow view in the XIII direction of FIG.

* Description of the symbols for the main parts of the drawings *

(10)... … … … … … … … … … … tip,

(11)... … … … … … … … … … … Tool Body,

(12). … … … … … … … … … … Frontal Side,

(13). … … … … … … … … … … Attachment,

(14). … … … … … … … … … … side,

(15). … … … … … … … … … … Arc Lake Face,

(16). … … … … … … … … … … Flat Lake Face,

(17). … … … … … … … … … … Finishing Cutting Edge,

(18). … … … … … … … … … … Cutout,

(19). … … … … … … … … … … Outer cutting edge.

FIELD OF THE INVENTION The present invention relates to drawaway tips for use in longitudinal milling cutters, and in particular to drawaway tips suitable for use in finishing milling cutters.

Conventionally, as this type of drawaway tip (hereinafter abbreviated as a tip), what is described in Unexamined-Japanese-Patent No. 63-53612 is known, for example.

As shown in FIG. 10 and FIG. 11, this tip is a so-called inclination in the direction which the four side surface 3 arrange | positioned around the upper surface (1) (2) crosses at an acute angle with respect to the upper surface (1). A positive tip, and a convex curved surface 4 is formed at a portion that intersects the upper surface 1 of each side surface 3 so that the finishing cutting edge having a convex arc shape at the intersection ridge of the upper surface 1 and each side surface 3 ( 5) is formed. In addition, at the corner portion where each side surface 3 intersects, a notch surface 6 gradually narrowing from the upper surface 1 to the lower surface 2 is formed, and these notch surface 6 and the side surface 3 are formed. The outer circumferential cutting blade 7 is formed in the ridge of the ridge.

As shown in FIGS. 12 and 13, the tip configured as described above has one finishing cutting edge 5 protruding substantially parallel from the distal end surface of the tool body 8, and one outer cutting edge 7 ) Protrudes to the outer circumferential side of the tool body 8, and is detachably attached to the tip attachment sheet 9 of the tool body 8 by means of bolts (not shown). Thereby, the upper surface 1 which is continuous to the finishing cutting edge 5 becomes the front margin surface facing the front end side of the tool body 8, while one side surface 3 which is continuous to the finishing cutting edge 5 is provided. The notch surface 6 which becomes the rake surface which faces this tool rotation direction, and continues to the one outer peripheral cutting edge 7 which protrudes to the tool outer peripheral side is located in the tool rotation direction side rather than the outer peripheral cutting edge 7, It becomes the rake surface of the outer peripheral cutting edge 7.

In the above state, the tip rotates around the tool axis along with the tool body 8, whereby the outer peripheral cutting edge 7 cuts a predetermined cutting portion left in the workpiece, and the finishing cutting edge 5 ) To be processed in the plane.

By the way, in the conventional example mentioned above, the notch surface 6 which cross | intersects the side surface 3 of an tip at an obtuse angle is used as the rake surface of the outer peripheral cutting edge 7, and the side continuous to the finishing cutting edge 5 is used. (3) is attached to the tool main body 8 while its outer peripheral side is inclined so as to retreat in the opposite direction to the tool rotation direction, so that the radial rake angle of the outer peripheral cutting edge 7 becomes a remarkable incidence angle and Axial rake angle is also an incidence. For this reason, there existed a fault that the machinability of the outer peripheral cutting edge 7 became extremely poor, and the cutting resistance also increased and a micro vibration easily became large.

This invention is made | formed based on the above-mentioned situation, and an object of this invention is to provide the tip which can suppress fine vibration by improving the cutting property of an outer peripheral cutting edge at the time of finishing cutting.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention is the corner part located in the one end of a finishing cutting edge among the corner parts of a front free surface of the said finishing cutting blade seen from the plane in the direction orthogonal to the front free surface. A cutout surface intersecting at one end and an obtuse angle is formed, and an outer circumferential cutting edge is formed at the ridge intersecting the cutout surface and the positive rake face with respect to the above-mentioned finishing cutting edge.

According to the above configuration, since the outer circumferential cutting edge is formed at the intersection ridge with the positive rake surface for the finishing cutting edge among the ridges of the cutting surface, the positive rake surface for the finishing cutting edge is used as the rake surface of the outer cutting edge. It can be shared and the cut face can be used as the outer margin for the outer cutting edge. For this reason, it is possible to improve the machinability of the outer circumferential cutting edge by setting the radial inclination angle of the outer circumferential cutting edge to an incidence in a smaller range than before.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 9.

In these figures, reference numeral 10 denotes a tip of the present embodiment. The tip 10 is formed of a cemented carbide and formed into a substantially quadrangular flat plate. As shown in FIG. 1, an upper surface of the tip 10 of the upper and lower surfaces facing the thickness direction of the flat plate is shown in FIG. The front face surface 12 faces toward the top face, and the bottom face is the attachment face 13 to the tool body 11.

As shown in FIG. 1 and FIG. 2, four side surfaces 14 are provided around the front free surface 12. As shown in FIG. These side surfaces 14 are provided on the side that intersects the front free surface 12 and protrude in an arc shape toward the outside of the tip, and are installed on the side where the attachment surface 13 intersects to be flat in the longitudinal direction. It consists of a flat rake surface 16 that extends.

And as shown in detail by FIG. 3, the trimming edge 17 is formed in the cross | intersection part of the said arc-lake surface 15 and the front margin surface 12, The finishing cutting edge 17 Is formed in a curved blade shape that curves with a relatively large radius of curvature R outwardly of the tip 10 according to the curvature of the arc lake surface 15. In addition, although the finishing cutting edge 17 is formed in the front margin surface 12 and the ridge part of the four side surface 14 in this embodiment, it is not limited to this in this invention, The front margin surface 12 is not limited to this. May be formed on only one side or on two opposite sides, as appropriate.

In addition, as shown in FIG. 4, each of the rake surfaces 15 and 16 constituting the side surface 14 is directed from the front free surface 12 side to the attachment surface 13 side along the tip thickness direction. As a result, a positive rake surface gradually retreating to the central axis of the tip 10 is formed. The angles (hereinafter referred to as tip rake angles), γ ₁ , and γ ₂ formed by these rake surfaces 15 and 16 with respect to the surface orthogonal to the front free surface 12 are appropriately determined depending on the material and cutting conditions of the workpiece. Although it is determined as an example, γ ₁ γ ₂ , that is, the tip rake angle γ ₁ of the circular arc surface 15 is determined to be smaller than the tip rake angle γ ₂ of the flat brake surface 16. γ ₁ is preferably in the range of 1 ° to 15 °, and γ ₂ is preferably in the range of 5 ° to 20 °.

Then, as shown in FIGS. 1 to 5, notch surfaces 18 are provided on all corner portions C of the front free surface 12. Is formed. These notched surfaces 18 are each formed by looking at each corner portion C of the front free surface 12 located at one end of each finishing cutting edge 17 in a plane in a direction orthogonal to the front free surface 12. It cuts in the direction which intersects the one end part of the finishing cutting edge 17 by obtuse angle (theta), and the shape seen in the plane has shown triangular shape. In addition, an outer peripheral cutting edge intersecting the one end of the finishing cutting blade 17 at an obtuse angle with the arc-shaped brake surface 15 corresponding to each finishing cutting blade 17 among the ridges of the notched surface 18 ( 19) is formed. These outer peripheral cutting edges 19 are predetermined with respect to the direction orthogonal to the front free surface 12 when viewed from the direction along the intersecting ridge line between the notched surface 18 and the front free surface 12 (see FIG. 5). It is inclined by the inclination angle ø of. Incidentally, the inclination angle? Is set such that the tip 10 corresponds to two corner angles to be mounted on the tool body 11.

Here, the width S (refer to FIGS. 2 and 5) located in the direction orthogonal to the front free surface 12, that is, the tip thickness direction, refers to the material of the workpiece and the peripheral cutting. Although suitably determined according to cutting conditions, such as the cutting depth of the blade 19, the range of 0.2 mm-1.0 mm is used suitably. In addition, although the notch 18 and the outer peripheral cutting edge 19 are formed in all the corner parts C of the front margin surface 12 in this embodiment, this invention is not limited to this, For example, finishing cutting In the case where the blade 17 is formed only on one side of the front free surface 12, one cut surface 18 and an outer peripheral cutting blade 19 are formed on one end side of the finishing cutting blade 17. According to the number of the finishing cutting blade 17 to be appropriately changed.

Next, although the operation | movement of the tip 10 comprised as mentioned above is demonstrated, the structure of the tool body 11 with which the tip 10 was attached is demonstrated briefly.

As shown in FIG. 6 and FIG. 7, the tool body 11 is formed in the substantially cylindrical shape determined at the front-end | tip side, and the several tip pocket 21 and the tip-attached sheet | seat 22 are provided at the tip outer peripheral side. ) Are formed at appropriate intervals in the circumferential direction.

As shown in detail by FIG. 8 and FIG. 9, the tip attachment sheet 22 has the bottom surface 22a which closely adheres to the attachment surface 13 of the tip 10, and the two side surfaces which the tip 10 adjoins ( 14 and side wall surfaces 22b and 22c in close contact with each other, and the bottom surface 22a faces the direction of the tool rotation (direction of arrow A in FIG. 7) in the opposite direction to the tool tip end surface 11a. It is formed in the shape of an inclined surface that retreats a predetermined angle β to the rear end side of the tool in a direction parallel to

In addition, in attaching the tip 10 to the tool body 11 configured as described above, as shown in FIGS. 7 to 9, the tip 10 is inserted into the tip attachment site 22. The clamp screw 23 is inserted into the attachment hole 10a of the 10, and the clamp screw 23 is inserted into the screw hole 11b of the tool body 11, and the attachment surface 13 of the tip 10 and The side surface 14 is brought into close contact with the bottom face 22a and the side wall faces 22b and 22c of the tip attachment site 22, respectively. This protrudes in the tool rotation direction and the tool axis direction from the tip attachment sheet 22 of one finishing cutting edge 17 of the tip 10 and crosses one end of the finishing cutting edge 17. The outer peripheral cutting edge 19 is protruded to the outer peripheral side of the tool. Furthermore, one side 14 serving as the rake face of the finishing cutting edge 17 simultaneously serves as the rake face for the outer peripheral cutting edge 19, and the cutout surface 18 connected to the outer peripheral cutting edge 19 has an outer circumference. It becomes an outer periphery clearance surface with respect to the cutting edge 19. In addition, since the tool body 11 is rotated around the axis after the tip 10 is attached in the above state, as shown in FIG. ), Or the trimming cutting edge 17 cuts the processed surface cut-and-formed at the outer peripheral cutting edge 19 into a plane.

Here, since the tip 10 of the present embodiment is configured to share the side surface 14 serving as the positive rake surface of the finishing cutting blade 17 as the rake surface of the outer peripheral cutting blade 19, as shown in FIG. The radial inclination angle γ ₃ of the outer peripheral cutting edge 19 coincides with the inclination angle given to the finishing cutting edge 17. On the other hand, in the above-described conventional method, the radial inclination angle of the outer peripheral cutting edge is a large incidence larger than the inclination angle of the finishing cutting edge. Therefore, according to the tip 10 according to the present embodiment, the cutting edge is viewed from the bottom of the tool. While keeping the inclination angle of (17) the same, the radial inclination angle of the outer circumferential cutting edge 19 can be set to an incidence of a smaller range than in the prior art. Moreover, the lateral inclination angle of a right angle is also provided to the outer peripheral cutting edge 19 according to the tip inclination angle (gamma) ₁ of the circular arc surface 15 used as a rake surface. Therefore, according to the tip 10 of the present embodiment, the cutting property of the outer peripheral cutting edge 19 is improved, and the occurrence of minute vibration is also suppressed, and as a result, a very good quality surface can be obtained.

In addition, in this embodiment, since notch 18 is formed in every corner part C of the front side surface 12, and the outer peripheral cutting edge 19 is installed in four corners, there is no unnecessary part in a tip, It is economical. In this embodiment, one of the upper and lower surfaces facing each other in the thickness direction of the tip 10 is brought into close contact with the bottom face 22a of the tip attachment site 22 as the attachment surface 13, so that the finishing cutting edge 17 The thickness of the tip 10 may be managed when adjusting the amount of protrusion (hereinafter referred to as a solid amount) toward the tip side in the direction of the tool axis. Therefore, the thickness management of the tip 10 is largely dependent on the grinding precision of the front free surface 12 and the attachment surface 13, and the grinding precision is larger than the front free surface 12 than the narrow side surface 14. The attachment surface 13 side can be easily improved. Therefore, according to the present embodiment, the processing accuracy can be improved by eliminating dispersion of the amount of solid body due to poor accuracy of the tip 10.

As described above, the tip of the present invention includes one end of the finishing cutting edge described above in a plane in a direction orthogonal to the front margining surface in the corner portion located at one end of the finishing cutting edge among the corner portions of the front margin. Since a notch surface intersecting with a negative angle and an obtuse angle is formed, and an outer circumferential cutting edge is formed at the intersection ridge of the positive rake surface with respect to the notch and the above-mentioned finishing cutting edge, the radial inclination angle of the circumferential cutting edge is smaller than before. The angle of inclination of the range can be set, and the lateral inclination angle can also be set to the right angle. Therefore, the machinability of the outer peripheral cutting edge is improved and fine vibration is suppressed, and as a result, an excellent effect of obtaining a good quality finished surface is achieved.

Claims (4)

One side of the upper and lower surfaces facing each other in the thickness direction, forming a polygonal flat plate shape, becomes a front margin surface 12, and the other side is an attachment surface 13 to the tool body 11, and the side surfaces disposed around these upper and lower surfaces ( At least one of 14) becomes a positive rake surface inclined in an acute angle with respect to the front margin surface 12, and the trimming cutting edge 17 is provided on the cross ridge of the positive rake surface and the front margin surface. At the draw away tip formed; In the corner part located at one end side of the finishing cutting edge 17 among the corner parts of the above-mentioned front free surface 12, the above-mentioned finishing cutting edge 17 is seen in a plane in a direction orthogonal to the front free surface. A cutout surface 18 intersecting at one end with an obtuse angle is formed, and an outer peripheral cutting edge 19 is formed at the intersection ridge of the positive rake face with respect to the cutout surface 18 and the finishing cutting edge 17. Draw away tip. The method of claim 1, A drawaway tip, characterized in that the notched surface (18) and the outer peripheral cutting edge (19) are formed in all corners of the front margin surface (12). The method according to claim 1 or 2, A drawaway tip, characterized in that the width that the outer peripheral cutting edge (19) occupies in the direction orthogonal to the front free surface (12) is set in the range of 0.2mm to 1.0mm. The method according to any one of claims 1 to 2, Draw away tip characterized in that the finishing cutting blade (17) is formed in a convex curve shape.