JP2005186226A - Milling cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a milling cutter, restraining vibration of a milling cutter and a tip to improve the surface accuracy of a machined surface. <P>SOLUTION: In this milling cutter 10, an annular body 30 is removably connected and fixed to a cutter body 20. The annular body 30 includes one or more tips 30 having a cutting blade along the peripheral surface of the outer peripheral part of the tip, and it is connected and fixed to the cutter body 20 formed separately to be substantially disc-like by a plurality of connecting members 60. Further, at least one tip 40 having a front cutting blade 44 projected toward the forward end in the direction of an axis O of the annular body 30 is mounted in a position in the circumferential direction of the milling cutter 10 which is a node of vibration mode having a diameter node based on a connecting part 32A of the connecting member 60 in the annular body 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a milling cutter.

In a milling cutter (10) having a large cutting edge outer diameter, there is a milling cutter (10) attached to a cutter body (20) via an annular body (30) separate from the cutter body (20). In this type of milling cutter (10), a milling cutter (10) intended for highly accurate cutting is illustrated in FIG.

As shown in FIG. 13, the milling cutter (10) includes a cutter main body (20) attached to a tip end portion of a rotating spindle spindle, and a plurality of chips (40) mounted on the outer peripheral portion of the tip end. 20) and an annular body (30) attached to the cutter body (20) by a fastening member (50) on the inner peripheral side of the annular body (30), and the annular body (30) is attached to the cutter body. And an auxiliary mounting member (100) to be fixed to (20). A holding member (101) protruding outward is provided on the outer peripheral surface of the auxiliary mounting member (100), while the inner periphery of the mounting surface (20b) on the cutter body (20) side in the annular body (30). A guide groove (35) for guiding the holding member (101) provided on the auxiliary mounting member (100) to the inside of the cutter body (20) is cut out on the side, and communicated with the guide groove (35). Thus, an accommodation recess (36) for accommodating the holding member (101) is provided on the inner peripheral surface of the cutter body (20).

With the above configuration, the milling cutter (10) is firmly attached so that the annular body (30) does not rattle by the auxiliary mounting member (100), and the milling cutter (10) is rotated to perform cutting. In this case, the annular body (30) does not rattle, so that cutting with high accuracy can be performed, and damage to the tip (40) attached to the annular body (30) is prevented. (For example, see Patent Document 1)

JP-A-11-129111

The inventor conducted experiments and analyzes on the vibration generated in this kind of milling cutter (10) and chip (40). As a result, the annular body (30) includes the annular body (30) and the cutter body (20). It was found that vibrations occurred in a vibration mode having a diameter node with respect to the connecting portion (32A) as a reference, and that this vibration greatly influenced the vibrations of the milling cutter (10) and the tip (40). . Therefore, as described above, simply fixing the annular body (30) firmly to the cutter body (20) is not sufficient to reduce the vibration of the milling cutter (10) and the tip (40). It was necessary to take measures to suppress the vibration caused by the vibration mode.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a milling cutter that suppresses vibrations of the milling cutter and the chip and improves the surface accuracy of the processed surface.

In this type of conventional milling cutter, the relative relationship between the mounting position of the tip in the circumferential direction, the position of the fastening portion of the cutter body, and the position of the connecting portion of the annular body has not been specified or suggested in particular. . In the milling cutter, the inventor pays attention to a vibration mainly having a vibration mode having a diameter node with respect to the fastening portion and the connecting portion so that the vibration node or the amplitude of the vibration is minimized. Thus, the present inventors have obtained the knowledge that an effect of reducing vibrations of the milling cutter and the chip can be obtained by adopting a configuration in which the chip is mounted at the circumferential position.

That is, the milling cutter according to the first aspect of the present invention is a milling cutter in which an annular body is detachably connected and fixed to the cutter body, and the cutter body having a substantially disk shape has a plurality of fastenings for attaching to the tip end portion of the spindle. A member, a columnar or cylindrical boss projecting from the center of the tip of the cutter body, and an annular mounting surface on the end surface facing the tip around the boss, The annular body formed into a body has a plurality of connecting members to be attached to the cutter body, and one tip having a cutting edge is provided along the peripheral surface of the outer peripheral portion of the annular body. In addition, the tip of the annular body in the axial direction (O) is provided at the circumferential position of the milling cutter serving as a vibration mode node having a diameter node with respect to the connecting portion of the annular body by the connecting member. The front cutting edge facing to the side Characterized in that at least one mounting the chips.

A milling cutter according to a second aspect of the present invention is a milling cutter in which an annular body is detachably connected and fixed to a cutter main body, and the cutter main body having a substantially disc shape includes a plurality of fastening members for attaching to the tip end portion of the spindle. A cylindrical or cylindrical boss projecting from the center of the front end of the cutter body, and an annular mounting surface on the end surface facing the front end around the boss part, on the other hand, separately from the cutter body The formed annular body having an annular shape has a plurality of connecting members to be attached to the cutter body, and includes one or more chips having cutting edges along the peripheral surface of the outer peripheral portion of the annular body. Further, the axis (O) of the annular body at a circumferential position of the milling cutter at which the amplitude of a plurality of vibration modes having a diameter node with reference to the fastening portion by the fastening member of the cutter body is minimized. Front facing the front Re, characterized in that a chip having a blade which at least one is mounted.

A milling cutter according to a third aspect of the present invention includes at least one fastening member to be attached to the main shaft or the tip of the arbor, and one tip having a cutting edge along the peripheral surface of the tip of the milling cutter. In the milling cutter provided as described above, the axis (O) of the milling cutter is positioned at the circumferential position of the milling cutter serving as a vibration mode node having a diameter node with respect to the fastening portion by the fastening member of the milling cutter. At least one tip having a front cutting edge facing the front end in the direction is mounted.

According to the first aspect described above, the vibration of the tip that occurs during cutting is difficult to excite the vibration of the annular body, and the vibration of the annular body is difficult to excite the vibration of the tip. Therefore, the vibration of the milling cutter and the tip is suppressed. Further, on the processed surface of the work material cut by the front cutting edge of the chip, the processed surface accuracy such as surface roughness, flatness, and flatness is improved.

According to the second aspect of the invention, the vibration of the annular body that occurs during cutting is difficult to excite the vibration of the milling cutter, and the vibration of the cutter body is difficult to excite the vibration of the annular body. Therefore, the vibration of the milling cutter and the tip is suppressed. Further, on the processed surface of the work material cut by the front cutting edge of the chip, the processed surface accuracy such as surface roughness, flatness, and flatness is improved.

According to the third aspect of the present invention, the vibration of the chip generated during cutting is difficult to excite the vibration of the milling cutter body, and the vibration of the milling cutter main body is difficult to excite the vibration of the chip. Therefore, the vibration of the milling cutter and the tip is suppressed. Further, on the processed surface of the work material cut by the front cutting edge of the chip, the processed surface accuracy such as surface roughness, flatness, and flatness is improved.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an essential part of the milling cutter of the present embodiment. FIG. 2 is a sectional side view of the main part of the milling cutter shown in FIG. FIG. 3 is a front view of a main part of a cutter body used in the milling cutter shown in FIG. FIG. 4 is a sectional side view of the main part of the cutter body shown in FIG. FIG. 5 is a front view of an essential part of an annular body used in the milling cutter shown in FIG. FIG. 6 is a sectional side view of a main part of the annular body shown in FIG. FIG. 7 is a top view of the annular body shown in FIG.

The milling cutter (10) of the present embodiment has the same basic structure as that of the milling cutter disclosed in Japanese Utility Model Laid-Open No. 57-126914, and the cutter body (20) and the annular body (30) are respectively provided. It is formed separately and applied with these fitting means and attaching / detaching means comprising dharma holes.

A specific configuration of the milling cutter (10) of the present embodiment will be described below. As shown in FIGS. 3 and 4, the cutter body (20) having a substantially disc shape has a single shaft hole (21) for attaching to a spindle or the like (not shown) of a machine tool at the center thereof. A plurality of mounting holes (22) whose cross section forms a stepped hole around the shaft hole (21) extend in parallel to the axis (O). Further, a key groove (23) extending in the radial direction from the shaft hole (21) is provided on the rear end side (left side in FIG. 4) end surface (20a) of the cutter body (20).

A cylindrical or columnar boss portion (24) is projected from the center of the front end side (right side in FIG. 4) of the cutter body (20), and an annular body (30) is externally fitted to the boss portion (24). It is a possible configuration. An annular mounting surface (25) is provided on the end surface (20b) of the cutter body (20) around the boss portion (24), and a concentric circle is formed at the center of the mounting surface (25). A plurality of connecting female screws (27) are provided in parallel with the axis (O) at an equiangular pitch.

On the other hand, the annular body (30) is formed separately from the cutter body (20), and as shown in FIGS. 5 to 7, the height of the boss part (24) of the cutter body (20). Is provided with a hole (31) having a diameter substantially corresponding to the diameter of the boss portion (24) at the center and a tip (40) along the peripheral surface of the annular body (30) at the outer periphery of the tip. ) Is formed, and a tip (40) having a cutting edge is attached to the tip seat.

Although four chips (40) are shown in FIG. 5, the number of chips (40) is not particularly limited, and in the milling cutter (10) of this embodiment, 15 chips (40) are annular. Mounted on the body (30). The chip (40) is composed of 14 rough machining chips (40B) and one finishing chip (40A). As shown in FIGS. 6 and 7, both the chips (40A, 40B) are formed. Presents a substantially square plate shape.

Both chips (40A, 40B) are mounted via locators (70A, 70B) fixed to the annular body (30), respectively. The finishing chip (40A) is mounted on a chip seat of a locator (70A) provided on the rear side in the rotational direction (K) of the chip (40A), and the center part of the chip (40A) has a thickness. It is fixed by screwing into the locator (70A) a screw member that engages with a mounting hole penetrating in the direction. The rough machining tip (40B) is mounted on the tip seat of a locator (70B) provided on the front side in the rotational direction (K) of the tip (40B), and the rear side in the rotational direction (K) of the tip (40B). It is fixed by pushing the wedge member provided on the inner side in the radial direction of the annular body (30) with the screw member.

The rough machining tip (40B) protrudes from the outer peripheral surface (30c) of the annular body (30) with a main cutting edge (43) formed at the ridge portion at the intersection of the upper surface (41) and the side surface (42). The front cutting edge (44) formed on the upper surface of the corner portion is mounted so as to protrude from the front end surface (30b) of the annular body (30). On the other hand, in the finishing chip (40A), the wiper blade (45) formed at the intersecting ridge line portion between the upper surface (41) and the side surface (42) protrudes from the distal end surface (30b) of the annular body (30). At the same time, it is mounted so as to slightly protrude from the front cutting edge (44) of the rough machining tip (40B). The wiper blade (45) is linear or curved and extends in a direction substantially perpendicular to the axis (O), and is wider than the front cutting edge (44) of the rough machining tip (40B). It is formed. Furthermore, the main cutting edge (40B) of the rough machining tip (40B) is formed on the side ridge portion of the finishing chip (40A) facing the outer peripheral side of the annular body (30) so as not to cut the work material. 43) on the inner periphery side.

The annular body (30) is provided with engaging holes (32) for connecting bolts at several locations corresponding to connecting female screws (27) provided in the cutter body (20). The engagement hole (32) includes a large-diameter through hole (32a) that allows the head of the connection bolt (60) to pass therethrough and a stepped through hole (32b) that prevents the connection bolt (60) from coming off the head. Is a dharma hole formed by communicating in a keyhole shape in the circumferential direction.

When mounting the above-described milling cutter (10) on a machine tool, first, the shaft hole (21) and the key groove (23) of the cutter body (20) are used, and fastening bolts are attached to the respective mounting holes (22). It is attached to the spindle of the machine tool by a known method using fastening means such as (50). Here, the intersection of the axis of the fastening bolt (50) and the rear end side end surface (20a) of the cutter body (20) and its periphery are referred to as a fastening portion (22A).

Next, the connecting bolt (60) is screwed to some extent into each connecting female screw (27) of the cutter body (20). When screwed to some extent, the seating surface of the head of the connecting bolt (60) is more distal than the stepped portion of the stepped through hole (32b) of the annular body (30) when fixed to the cutter body (20). It means screwing to the extent that it protrudes to the side.

In this state, the annular body (30) is approached from the front end side in the axis (O) direction of the cutter body (20), and the hole (31) at the center is formed in the boss part (24) of the cutter body (20). The coupling bolt (60) head screwed into the cutter body (20) is inserted into the large-diameter through hole (32a) of the engagement hole (32), and then the annular body (30 ) Is rotated by a predetermined angle so that the head portion of the connecting bolt (60) is engaged with the stepped through hole (32b) and temporarily held by the cutter body (20). Then, as shown in FIGS. 1 and 2, the annular body (30) is completely fitted onto the boss portion (24) of the cutter body (20) by finally tightening the connecting bolt (60). Fix it. Here, the intersection of the axis of the connecting bolt (60) and the rear end side end face (30a) of the annular body (30) and its periphery are referred to as a connecting portion (32A).

In the milling cutter (10) of the present embodiment, the mounting position of the tip (40) in the circumferential direction of the milling cutter is a vibration mode having a diameter node with respect to the connecting portion (32A) of the annular body (30). A plurality of nodes having a diameter node with reference to the connecting portion (32A) of the annular body (30) and the fastening portion (22A) of the cutter body (20). It is made to substantially coincide with the position where the amplitude of the vibration mode is minimum. The effects obtained in such a configuration will be described below using Examples and Comparative Examples.

In order to obtain the vibration in the vibration mode having the diameter nodes with reference to the fastening portion (22A) and the connecting portion (32A) of the milling cutter (10) described above, 4 of the milling cutter (10) shown in FIGS. A 10-node solid element was created and the structure was analyzed by the finite element method. The material of the cutter body (20) and the annular body (30) was SCM440 (JIS). As a load condition, a load of 1 N was applied to the tip of the wiper blade (45) of the finishing tip (40A) in parallel to the axis (O) toward the rear end. Further, as the boundary conditions, the fastening state between the cutter body (20) and the main shaft, and the connection state between the annular body (30) and the cutter body (20) were set to the bolt coupling state. Under the above conditions, the response in the axis (O) direction at the tip of the wiper blade (45) of the finishing chip (40A) was determined.

FIG. 8 is a front view of the milling cutter (10) according to the present embodiment. In FIG. 8, only the finishing chip (40A) to be subjected to vibration analysis is shown. The angular pitch of the milling cutter (10) in the circumferential direction of the tip (40A) for finishing with respect to the connecting portion (32A) of the annular body (30) is α, and the fastening portion (22A) of the cutter body (20) is connected to the fastening portion (22A). The angular pitch in the circumferential direction of the connecting portion (32A) of the annular body (30) was β. Note that both α and β were positive in the direction opposite to the rotational direction (K) of the milling cutter with reference to the connecting portion (32A) of the annular body (30). The angular pitches α and β in the examples and comparative examples used for the analysis are as shown in Table 1.

No. in Table 1 In the comparative example shown in FIG. 7, the angle α is set to −20 ° and the angle β is set to −45 °. First, the analysis results of this comparative example are shown in FIGS. FIG. 9A is a graph showing a time history response in which time is taken on the horizontal axis and the displacement of the tip of the wiper blade (45) of the finishing chip (40A) is taken on the vertical axis. FIG. 9B is a graph showing the displacement in each vibration mode with the frequency on the horizontal axis and the displacement of the tip of the wiper blade (45) on the vertical axis. In order to make a relative comparison between this comparative example and the examples described later, the graphs shown in FIGS. 9A and 9B and the graphs of the examples corresponding thereto (FIGS. 10 and 12). Indicates the same scale in which the displacement on the vertical axis is converted to percentage (%).

From FIG. 9B, the influence on the vibration of the finishing chip (40A) is largely due to the vibration in the vibration mode having a diameter node with reference to the fastening portion (22A) of the cutter body (20). It can be seen that mode 7 is mainly composed of mode 2, mode 3, mode 4, and a vibration mode having a diameter node with reference to the connecting portion (32A) of the annular body (30).

Next, Example 1 in the present embodiment will be described below. In order to minimize the vibration of the finishing chip (40A) caused by the mode 7 in which the vibration of the vibration mode having the diameter node of the annular body (30) is the main, in the embodiment 1, the milling cutter is used. The position of the finishing chip (40A) in the circumferential direction of (10) is a position that substantially coincides with the node of the mode 7. The position of the node in the mode 7 in the circumferential direction is obtained from the analysis result of the comparative example described above, and the position in the circumferential direction of the node in the mode 7 is No. 1 in Table 1. 1-No. As shown in FIG. 6, the angle α is at a position of −5 °. In Example 1, the angle pitch β is set to −45 ° as in the comparative example. And the same thing as the analysis of the comparative example mentioned above about Example 1 was performed.

The analysis results of Example 1 are shown in FIGS. 10 (a) and 10 (b). 10A is a graph showing the time history response corresponding to FIG. 9A, and FIG. 10B shows the displacement of each vibration mode corresponding to FIG. 9B. It is a graph. From these figures, it can be seen that the amplitude of the vibration in mode 7 and the initial vibration in Example 1 is greatly reduced as compared with the comparative example.

Thus, according to the first embodiment, the following effects can be obtained. In the first embodiment, the vibration of the finishing chip (40A) generated at the time of cutting hardly excites the vibration of the annular body (30), and the vibration of the annular body (30) is caused by the finishing chip (40). Since it becomes difficult to excite vibration, vibration of the finishing chip (40A) and the annular body (30) is suppressed. Further, on the processed surface of the work material cut by the wiper blade (45) of the finishing chip (40A), the processed surface accuracy such as surface roughness, flatness and flatness is improved. In addition, since the load on the wiper blade (45) is reduced by reducing the vibration, chipping or chipping is less likely to occur and the cutting edge life is prolonged. Further, the degree of freedom in setting the blade edge shape such as the clearance angle of the wiper blade (45) and the honing shape is increased.

Next, Example 2 will be described. In the second embodiment, the effect of reducing the vibration of the finishing chip (40A) due to the vibration in the vibration mode having the diameter node with respect to the connecting portion (32A) of the annular body (30) is remarkable. Further, the finishing chip (40A) is configured to reduce the vibration caused by the vibrations of a plurality of vibration modes having diameter nodes with reference to the fastening portion (22A) of the cutter body (20). That is, in Example 2, the vibration mode in which the position of the finishing chip (40A) in the circumferential direction of the milling cutter (10) has a diameter node with reference to the fastening portion (22A) of the cutter body (20). Of these vibrations, the amplitudes of the plurality of vibration modes of mode 2, mode 3, and mode 4 that have a large influence on the vibration generated in the finishing chip (40A) are substantially matched to the position where the amplitude is minimum. The position where the amplitudes of the plurality of vibration modes are minimized can be roughly determined from the analysis result of the comparative example described above. As shown in FIG. 5, the angle β is at a position of 5 °.

Example 2 having such a configuration was analyzed. For comparison with Example 2, Examples (No. 2 to No. 2 in Table 1) in which the angle β was variously changed to −30 °, −15 °, 0 °, and 30 ° in Example 1. The examples shown in No. 4 and No. 6) were also analyzed.

The results obtained from this analysis are shown in FIGS. FIG. 11 is a graph showing the relationship between the vibration displacement at the tip of the wiper blade of the finish machining tip on the vertical axis and the angular pitch β on the horizontal axis. In this figure, the vibration displacement on the vertical axis is expressed as a percentage (%). 12A is a graph showing the time history response corresponding to FIG. 9A, and FIG. 12B shows the displacement of each vibration mode corresponding to FIG. 9B. It is a graph. As can be seen from FIG. 11, among the examples in which the angle α was set to −5 °, the vibration displacement was the smallest in Example 2. This is because the finishing chip (40A) is mounted at a circumferential position where the vibration of the plurality of modes of the cutter body (20) is minimized.

As can be seen from FIG. 12B, the amplitudes of the vibrations of the mode 2 and the mode 3 and the initial vibration are greatly reduced in the second embodiment compared to the comparative example. Further, as can be seen from FIG. 12A, in Example 2, the amplitude of the initial vibration was reduced to 65 to 70% of the comparative example.

Therefore, according to the second embodiment, the following effects can be obtained. In Example 2, the vibration of the finishing chip (40A) generated during cutting becomes difficult to excite the vibration of the cutter body (20) and the annular body (30), and the cutter body (20) and the annular body (30). This makes it difficult to excite the vibration of the finishing chip (40), so that the vibration of the finishing chip (40A), the cutter body (20) and the annular body (30) is suppressed. In the processed surface of the work material cut by the wiper blade (45) of the finishing chip (40A), the processed surface accuracy such as surface roughness, flatness, and flatness is improved. In addition, since the load on the wiper blade (45) is reduced by reducing the vibration, chipping or chipping is less likely to occur and the cutting edge life is prolonged. Further, the degree of freedom in setting the blade edge shape such as the clearance angle of the wiper blade (45) and the honing shape is increased.

In Example 1, the tip (40) mounted on the milling cutter (10) is substantially the same as the vibration node of the vibration mode having a diameter node with respect to the connecting portion (32A) of the annular body (30). The tip (40) mounted at the circumferential position is not limited to the finishing tip (40A) described above, and may be a roughing tip (40B). Further, as an effect at that time, the vibration of the front cutting edge (44) of the rough machining tip (40B) is suppressed as in the case of using the finishing machining tip (40A), and the work surface of the work material is reduced. The surface accuracy is improved and the cutting edge life is extended. Further, not only one tip (40) is mounted at a circumferential position substantially coincident with the vibration node of the vibration mode having the diameter node with respect to the connecting portion (32A) of the annular body (30). There may be a plurality, and in that case, the above-described effects are further enhanced.

Furthermore, in Example 1, in the vicinity of the tip seat formed at the circumferential position substantially coincident with the vibration node of the vibration mode having the diameter node with respect to the coupling portion (32A) of the annular body (30). An identification mark (90) is preferably applied. In the present embodiment, as shown in FIGS. 5 and 7, the recognition mark (90) is provided, for example, on at least one of the tip surface (30b) and the peripheral surface of the annular body (30). In this way, the chip (40) to be mounted on the upper chip seat can be mounted without error.

In Example 2, the tip to be mounted at the circumferential position where the amplitude of the plurality of vibration modes is minimized with reference to the fastening portion (22A) of the cutter body (20) is the roughing tip (40B). There may be not only one chip (40) mounted in the position, but also a plurality of chips (40). In such a case, the same effect as in the first embodiment can be obtained.

Moreover, in Example 2, it is preferable to provide a relative circumferential positioning means between the cutter body (20) and the annular body (30). In the present embodiment, as illustrated in FIG. 1, a recognition mark (90) is imprinted on each of the cutter body (20) and the annular body (30), and the cutter body (20) and the annular body (30) are connected to each other. Means are provided for matching both recognition marks (90) when connected at a predetermined position. Further, instead of the recognition mark (90), an engaging means or a fitting means comprising a key and a key groove may be used. By having such a configuration, the relative positions of the cutter body (20) and the annular body (30) in the circumferential direction should not be mistaken, and should be mounted on a predetermined tip seat of the annular body (30). The chip (40) can be mounted without error.

The embodiment of the milling cutter is not limited to that of a form in which the annular body (30) formed separately is detachably connected to the cutter body (20) as in the present embodiment. Needless to say, the present invention can be applied to a milling cutter in which (20) and the annular body (30) are integrally formed. Further, the position and number of the cutter body (20), the annular body (30), and the fastening part (22A) and the connecting part (32A) of the integrally formed milling cutter are also limited to the above-described embodiments. It goes without saying that there is nothing to do.

It is a principal part front view of the milling cutter which concerns on this invention. It is a principal part sectional side view of the milling cutter shown in FIG. It is a principal part front view of the cutter main body used for the milling cutter shown in FIG. FIG. 4 is a side sectional view of a main part of the cutter body shown in FIG. 3. It is a principal part front view of the annular body used for the milling cutter shown in FIG. It is principal part side sectional drawing of the annular body shown in FIG. It is a top view of the annular body shown in FIG. It is a front view of the milling cutter according to the present embodiment, the circumferential angle pitch α of the finishing chip with respect to the connecting portion of the annular body, and the circumferential direction of the connecting portion of the annular body with respect to the fastening portion of the cutter body It is a figure which shows angle pitch (beta). (A) is a time history response of the tip of the wiper blade of the finishing chip in the comparative example, and (b) is a displacement in each vibration mode. (A) is a time history response of the wiper blade front-end | tip part of the tip for a finishing process in Example 1 of this invention, (b) is a displacement of each vibration mode. It is a figure which shows the relationship between the angle pitch (beta) in the milling cutter of the Example of this invention, and the vibration displacement in the wiper blade front-end | tip part of the chip | tip for a finishing process. (A) is a time waveform of the wiper blade front-end | tip part of the chip | tip for finishing in Example 2 of this invention, (b) shows the time waveform of the front-end | tip part. It is a schematic sectional drawing of the conventional milling cutter. It is the schematic explanatory drawing which looked at the milling cutter shown in FIG. 13 from the front end side. It is the schematic explanatory drawing which looked at the annular body used in the milling cutter shown in FIG. 13 from the attachment surface side of the cutter main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Milling cutter 20 Cutter main body 20a Rear end side end surface 20b Front end side end surface 22 Mounting hole 22A Fastening portion 24 Boss portion 25 Mounting surface 27 Connecting female screw 30 Annular body 31 Hole 32 Engagement hole 32a Large diameter through hole 32b Stepped through hole 32A Connecting part 40 Chip 40A Finishing chip 40B Roughing chip 41 Upper surface 42 Side surface 43 Main cutting edge 44 Front cutting edge 45 Wiper blade 50 Fastening bolt, fastening member 60 Connecting bolt, connecting member 70A, 70B Locator 75 Wedge 80 Wiper 90 wedge recognition mark for adjusting blade protrusion

Claims (6)

In a milling cutter in which an annular body is detachably connected and fixed to a cutter body, the cutter body having a substantially disc shape includes a plurality of fastening members for attaching to the tip end portion of the spindle, and a center portion of the tip end of the cutter body. A cylindrical or cylindrical boss portion that protrudes, and an annular mounting surface on an end surface facing the tip side around the boss portion, while the annular body that forms an annular shape separately from the cutter body, A plurality of connecting members for attaching to the cutter body, and at least one tip having a cutting edge along the peripheral surface of the outer peripheral portion of the annular body, and further, the connection of the annular body At least a tip having a front cutting edge facing the front end side in the axis (O) direction of the annular body at a circumferential position of the milling cutter serving as a vibration mode node having a diameter node with respect to a connecting portion by a member One installed Milling cutter, characterized. In a milling cutter in which an annular body is detachably connected and fixed to a cutter body, the cutter body having a substantially disc shape includes a plurality of fastening members for attaching to the tip end portion of the spindle, and a center portion of the tip end of the cutter body. A cylindrical or cylindrical boss portion that protrudes, and an annular mounting surface on an end surface facing the tip side around the boss portion, while the annular body that forms an annular shape separately from the cutter body, A plurality of connecting members for attaching to the cutter body, and including at least one tip having a cutting edge along the peripheral surface of the outer peripheral portion of the annular body, and further, the fastening of the cutter body A front cutting edge facing the front end side in the axis (O) direction of the annular body is provided at a circumferential position of the milling cutter where the amplitude due to a plurality of vibration modes having a diameter node with respect to a fastening portion by the member is minimized. Have few chips Both milling cutter, characterized in that mounted one. A milling cutter comprising at least one fastening member for attachment to a tip end of a main shaft or an arbor, wherein the milling cutter comprises one or more chips having cutting edges along a peripheral surface of a tip outer periphery of the milling cutter. A front cutting edge facing the front end side in the axis (O) direction of the milling cutter is provided at a position in the circumferential direction of the milling cutter serving as a vibration mode node having a diameter node with respect to the fastening portion by the fastening member of the cutter. A milling cutter having at least one chip mounted thereon. The milling cutter according to any one of claims 1 to 3, wherein at least one of the chips having a front cutting edge facing the front end side in the axis (O) direction of the milling cutter is a finishing chip, and the finishing is performed. The processing tip has a linear or arc-shaped wide wiper blade extending in a direction substantially perpendicular to the axis (O) of the milling cutter, and the wiper blade is arranged in the axis (O) direction of the milling cutter. A milling cutter characterized by being protruded most toward the tip side. The milling cutter according to any one of claims 1 to 4, wherein a relative positioning means in a circumferential direction between the cutter body and the annular body is provided. The milling cutter according to any one of claims 1 to 5, wherein a circumferential position of the milling cutter serving as a vibration mode node having a diameter node of the annular body, or a diameter node of the cutter body is defined. Mounted at the circumferential position of the milling cutter where the amplitude of vibration due to the plurality of vibration modes has the minimum, or at the circumferential position of the milling cutter serving as the node of the vibration mode having the diameter node of the milling cutter A milling cutter characterized in that a recognition mark is provided in the vicinity of a position where at least one of the chips is mounted.

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