JPH0318094Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to a throw-away type face milling cutter that is suitable for machining centers. (Prior Art) Conventionally, in this type of throw-away type face milling cutter, a general-purpose type in which the corner angle θ at the outer peripheral cutting edge of the throw-away tip is set to 45 degrees has been widely used. For example, as a practical example,
Publication No. 25908 can be mentioned. As shown in FIGS. 8 to 10, the device disclosed in this publication incorporates a locator 53, a throwaway tip 54, and a wedge piece 55 in the mounting groove 52 of the cutter body 51, and uses a so-called front wedge method to throw the cutter. The away chip 54 is fixed. However, in this face milling cutter, as clearly shown in FIG. It is larger than the outermost diameter of the chip 54. (Problems to be solved by the invention) However, when this face milling cutter was applied to a machining center, it was not compatible with the ATC pot diameter, ATC weight limit, etc., which caused problems. This is because machining centers generally have low drive horsepower and low mechanical rigidity, whereas conventional throw-away face mills have a considerable weight due to the high rigidity of the cutter body. . Therefore, the present invention attempts to solve the problems of compatibility with a machining center in the wedge-type indexable face mill described above by reducing the weight of the cutter body and improving the attachment mechanism accordingly. (Means for Solving the Problems) The present invention was developed in view of the above-mentioned points, and the mounting groove consists of a locator groove and a wedge groove, and the locator groove is arranged in the axial direction of the cutter body. The groove is provided in a blind groove shape substantially parallel to the line direction, and the wedge groove is provided in a blind groove shape substantially parallel to the edge of the outer peripheral cutting edge. Further, the locator has a tip seat formed at one end thereof to receive the throw-away tip, and when placed in the locator groove, is screwed from the outer circumferential portion on the stop side, and furthermore, this outer circumferential portion is fixed in the circumferential direction. The outer circumferential diameter of the cutter body is reduced by being substantially continuous with the outer circumferential surface of the cutter body and having substantially the same diameter as the chamfer located on the terminal end side of the outer circumferential cutting edge edge. Further, when the wedge piece is disposed in the wedge piece groove, the wedge piece moves up and down in a direction that substantially intersects the axial surface and the stop side surface of the locator groove, so that the wedge piece extends along the outer peripheral cutting edge ridge of the throw-away tip. It is designed to be screwed from the substantially perpendicular side. (Example) Hereinafter, an example of the indexable face milling cutter of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a disc-shaped cutter body with a center mounting hole 2, and a chip pocket 3 and a mounting groove 4 on its outer circumference.
are provided in pairs. In this mounting groove 4, a locator groove 4a and a wedge groove 4b are arranged in series so as to form a blind groove, and the locator groove 4a is approximately parallel to the axial direction of the cutter body 1. It is formed in Further, as shown in FIG. 4, the wedge groove 4b is formed to be substantially parallel to the outer cutting edge 6 of the throw-away tip 5 as a reference. A locator 8 having a chip seat 7 at one end is arranged in the locator groove 4a,
It is attached by screws 9 from the outer peripheral portion located on the stop side of the locator groove 4a. In this case, the throwaway tip 5 is shaped like a square plate, and a chamfer 10 is formed at the corner portion, and the corner angle number at the outer cutting edge ridge 6 is 30° to 65°. It is set within the range of °. This is because it is a necessary range for a lightweight configuration. In this embodiment, the corner angle θ is set as the inclination of the outer peripheral cutting edge ridge 6 with respect to the axial direction of the cutter body 1, and θ
=45° is adopted. In addition, a tightening screw 11 is provided in the wedge groove 4.
A wedge piece 12 having a screw hole 13 is received, and the direction of the axis 14 of the screw hole 13 is substantially perpendicular to the outer cutting edge 6 of the throw-away tip 5. Therefore, the wedge piece 12 moves up and down in a direction substantially intersecting the axial surface 15 and the stop side surface 16 of the locator groove 4a. Therefore, the pressing force that presses the throw-away tip 5 from the front side in the direction of rotation of the cutter body 1 is directed in the centripetal direction, thereby increasing the mounting rigidity. As described above, the locator 8 is attached by the screw 9 from the outer peripheral part on the stop side of the locator groove 4a, but this outer peripheral part is not shown in FIGS. 2 and 4. It has approximately the same diameter as the outer circumferential surface of the cutter body 1 in the circumferential direction so that the cutter body 1 has approximately the same diameter. That is, the outer circumferential portion of the locator 8 has approximately the same diameter as the chamfer 10 located on the terminal end side of the outer circumferential cutting edge ridge 6 of the throw-away tip 5,
Along with this, the outer circumferential diameter of the cutter body 1 is reduced. As a result, the weight of the product of the present invention is reduced compared to the conventional product as shown in the following table.

[Table] In the above table, the weight includes the throw-away tip 5, locator 8, etc. The present product and the conventional product differ in the attachment mechanism of the locator 8 and wedge piece 12. However, the rake angle, corner angle, etc. of the throwaway tip 5 have the same specifications. FIG. 5 shows a modification in which the throwaway tip 5 is shaped like a triangular plate. In this case, the wedge piece 12 is attached to the outer cutting edge 6 of the throw-away tip 5 in the wedge groove 4b by the tightening screw 11 from the perpendicular side thereof, as shown by imaginary lines. It will be done. In this embodiment, the cutter body 1 is provided with the center attachment hole 2, but the present invention is not limited to this, and a shank (not shown) may be formed at the rear of the cutter body 1. A so-called handled face milling cutter is also applicable. Next, a cutting example using the indexable face milling cutter of the present invention will be explained. The tool specifications are: cutting edge diameter = 160 mm, number of teeth = 8,
As for the throw-away tip 5, a square plate made of cermet was used. Further, the rake angle in the radial direction of the throw-away tip 5 was set to -3°, the rake angle in the axial direction to +15°, and the corner angle No. to 45°. For work material 17, SS41 (HB=125)
As for cutting conditions, cutting speed V=
190m/min, feed f=mm/blade and depth of cut d=mm, d-f=0.1-5, 0.15-3.0, 2-2
A block material with a cutting width of 125 mm was cut using a machining center using a combination of 3 to 3. As a result, the product of the present invention showed effective cutting performance under any cutting conditions. That is, the work material 17
SS41, where the chips are most likely to elongate, was applied, but the chips showed an appropriately curled shape as seen in Fig.
There was no jamming between the material and the tool, and the material was ejected stably. In addition, although the weight of the cutter body 1 is reduced in the product of the present invention, the structure of the wedge groove 4b and the locator groove 4a for the throw-away tip 5 provides sufficient mounting strength. There were no negative effects due to weight reduction. On the other hand, with the conventional product, as shown in Figure 7, chips that have turned once often become trapped between the workpiece 17 and the tool, and effective cutting cannot be performed in cutting where chips tend to spread. . The cutting edge diameter of the conventional product is 160 mm, which is the same as the inventive product, but as shown in the table above, the outer diameter of the cutter body 51 is 190 mm, and the number of teeth, rake angle, corner angle, etc. , which has the same specifications as the product of this invention. (Effect of the invention) As explained above, the present invention has the cutter body 1.
Since the attachment mechanism in the locator groove 4a and the wedge groove 4b has been improved in order to reduce the weight of the locator groove 4b, the following effects can be obtained. First, since the cutter body 1 is lightweight, it can be widely used even in low horsepower machines such as machining centers. This is a 35-40% weight reduction as shown in the table in the specification, and along with this
This is because various issues such as ATC pot diameter and ATC weight limit have been resolved. Second, the attachment strength of the throwaway tip 5 is also sufficient. This is shown in Figures 8 to 10.
This was confirmed by comparing the upper limit cutting (upper limit of feed and depth of cut) with the conventional product shown in the figure. That is, the locator 8 is securely attached by the screw 9 and the wedge piece 12,
This is because there was no occurrence of chatter vibration or the like in the throw-away tip 5. Thirdly, when cutting the workpiece 17 in which chips extend, there is no actual damage caused by chips being caught. This is because the outermost diameter of the throw-away tip 5 and the outer circumferential diameter of the cutter body 1 are formed to be approximately equal, so that chips are no longer caught between the workpiece 17 and the tool.

[Brief explanation of the drawing]

FIG. 1 is a partial front view showing an embodiment of the throw-away type face milling cutter of the present invention, FIG. 2 is a partial cross-sectional view of the throw-away tip portion, and FIG.
The figure is a partial top view, FIG. 4 is an explanatory diagram showing a composite configuration of the mounting groove, FIG. 5 is an explanatory diagram showing a modified example, and FIG. FIG. 7 is an explanatory diagram showing the state of chip discharge by a conventional product, FIG. 8 is a partial front view showing a conventional throw-away type face milling cutter, and FIG.
A partial cross-sectional view of the throwaway tip,
FIG. 10 is a partial top view. 1... Cutter body, 3... Chip pocket, 4
...Mounting groove, 4a... Locator groove, 4b...
...Wedge groove, 5...Throwaway tip, 6...
...Outer cutting edge ridge, 7...Chip seat, 8...Locator, 10...Champure, 11...Tightening screw, 12...Wedge piece.

Claims (1)

[Claims for Utility Model Registration] A chip pocket 3 and a mounting groove 4 are provided in pairs on the outer periphery of the cutter body 1, which is a rotating body. A throwaway tip 5 made of a polygonal plate located inside the seat 7 is attached to the tightening screw 1.
The corner angle θ formed by the outer cutting edge 6 of the throw-away tip 5 is set within the range of 30° to 65°. In the throw-away type face milling cutter, the mounting groove 4 consists of a locator groove 4a and a wedge groove 4b, and the locator groove 4
a is substantially parallel to the axial line direction of the cutter body 1 and is provided in the shape of a blind groove, and the wedge piece groove 4b
are provided in a blind groove shape substantially parallel to the outer peripheral cutting edge ridge 6, and the throwaway tip 5 has chamfers 10 formed at the corner portions, and
When placed in the tip seat 7 of the locator 8, the chamfer 10 on the starting end side of the outer peripheral cutting edge ridge 6 participates in cutting, and the chamfer 10 on the terminal end side does not participate in cutting, The locator 8 has a tip seat 7 formed at one end thereof to receive the throwaway tip 5, and when placed in the locator groove 4a, is screwed from the outer circumferential portion on the stop side. The outer circumferential diameter of the cutter body 1 is reduced by being substantially continuous with the outer circumferential surface of the cutter body 1 in the circumferential direction and having substantially the same diameter as the chamfer 10 located on the terminal end side of the outer cutting edge 6. , When the wedge piece 12 is placed in the wedge piece groove 4b, the axial surface 1 of the locator groove 4a
The tightening screw 11 is screwed in from a side substantially perpendicular to the outer peripheral cutting edge ridge 6 of the throw-away tip 5 so as to move up and down in a direction substantially intersecting the side surface 16 of the throw-away tip 5.
and a throw-away type face milling cutter characterized by having a fixed locator 8.