JP2526215Y2 - Cutting tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool in which a cutting tip is attached to an outer peripheral portion of a tool body.

[0002]

2. Description of the Related Art Conventionally, as a cutting tool for cutting a work material, such as a face mill or an end mill,
A plurality of chip mounting grooves are formed in the outer peripheral portion of the substantially cylindrical tool main body at appropriate intervals in the circumferential direction, and the cutting edge chips are inserted into these chip mounting grooves via a holder, and these cutting edge chips and the holding tool are held. It is known that at least one of the tools is pressed in the circumferential direction of the tool body by a pressing member such as a wedge member inserted into the chip mounting groove.

[0003]

However, conventional cutting tools such as face mills and end mills cannot be changed because the fixed position of the cutting edge chip holder in the chip mounting groove is restricted to one point and cannot be changed. There are drawbacks that the width that can cope with a change in the cutting width of the tool is narrow, and that the life of the cutting edge tip tends to be different. For example, in an end mill having a configuration in which a plurality of cutting edge tips are mounted in a row on the outer peripheral portion of the tool body, when cutting is performed using the entire blade length of the tool body, all the cutting edge tips are While the respective cutting volumes become equal in relation to the cutting, if the cutting width is smaller than the total blade length, only a part of the cutting edge chips participate in the cutting, resulting in a difference in the cutting edge life. Also, with a cutting tool such as a face milling cutter, the cutting depth (cutting width) cannot be increased beyond the length of the cutting edge of the cutting edge, and the cutting depth cannot be increased. If the length is exceeded, another tool with a larger cutting edge tip must be provided. The present invention has been made under such a background, and provides a cutting tool having a large range capable of responding to a change in the cutting width and capable of homogenizing the life of the cutting edge tip regardless of the cutting width. With the goal.

[0004]

In order to solve the above-mentioned problems, a cutting tool according to the present invention has a chip mounting groove formed in an outer peripheral portion of a tool body, and a cutting edge chip is provided in the chip mounting groove.
A pressing member that is inserted via a holder with the cutting edge ridge protruding from the outer periphery of the tool body, and at least one of the cutting edge tip and the holder is inserted into the chip mounting groove. A cutting tool pressed in the circumferential direction of the tool body, wherein the holder and the pressing member are movably mounted in a direction along the cutting edge ridge of the cutting edge tip, Position is cutting edge
It can be adjusted in the direction along the ridge . Here, in order to quickly adjust the position of the holder and the like, it is preferable to provide a scale on at least one of the holder and the pressing member and the outer peripheral portion of the tool body.

[0005]

According to the above construction, since the holder is movable in the direction along the cutting edge of the cutting edge, the plurality of cutting edges are moved along the respective cutting edges to move the holder. The cutting width of the cutting tool can be increased or decreased. That is, when the holder is moved so that the respective cutting edge tips approach each other in the axial direction of the tool main body, the length of the overlapping edge of the cutting edge of each cutting edge tip in the axial direction of the tool main body increases. When the cutting width is reduced and the holder is moved so that the respective cutting edges are separated from each other in the axial direction of the tool body, the length of the overlapping edge of the cutting edges of the respective cutting edges decreases. The cutting width increases.

In addition, since the cutting width of the tool body can be changed, the cutting width can be adjusted so that all the cutting tips are always involved in the cutting. In this case, the life of each cutting tip is uniform. Be transformed into In addition, since the pressing member is also movable, by moving the pressing member according to the amount of movement of the cutting edge tip, the clamped state of the cutting edge tip and the holder can always be kept constant. When the scale is provided, the amount of movement of the holder and the pressing member can be easily grasped, and the position of the cutting blade tip can be quickly adjusted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the face mill according to the present embodiment will be briefly described with reference to FIGS. 4 and 5.
, A plurality of chip mounting grooves 3 opening in the outer peripheral surface 2c of the tool main body 2 are provided at equal intervals in the circumferential direction on the outer peripheral portion on the distal end side of the disk-shaped tool main body 2 having the center hole 2a and the boss surface 2b. The holder 4 is inserted into these chip mounting grooves 3 and tightened with clamp bolts 5.
In the concave portions 6 of these holders 4, square flat plate-like cutting blade tips 7 made of a hard material such as a cemented carbide or ceramics,
Each of the corners 8 is projected from the front end face 2d of the tool main body 2, and one cutting edge 9 is projected from the outer peripheral face 2c by a predetermined angle while being inclined by a predetermined corner angle θ with respect to the axis X of the tool main body 2. These cutting blade tips 7 are arranged in front of the respective rake faces 10 and clamp bolts 11 are inserted.
The tool body 2 is pressed in the circumferential direction of the tool body 2 by a wedge member (pressing member) 12 which is tightened by the tool and is restrained in the chip mounting groove 3.

[0008] As shown in FIGS.
The holder insert portion 13 into which the holder 4 is inserted and the wedge member 1
2 is formed separately from a wedge insertion portion 14 into which the wedge member 2 is inserted. The width of each of these portions 13 and 14 in the substantially circumferential direction matches the width of the holder 4 and the width of the wedge member 12, respectively. On the other hand, the longitudinal direction of each part 13, 14 of the tip mounting groove 3 is made to coincide with the extending direction of the cutting edge ridge 9 of the cutting edge chip 7. The total length of each of the portions 13 and 14 of the chip mounting groove 3 is set to be sufficiently longer than the length of the holder 4 and the wedge member 12, and the holder 4 and the wedge member 12 move in the direction along the cutting edge 9. Is allowed.

The bolt mounting groove 1 extending in the longitudinal direction of the cutting edge 9 is provided on the bottom side of each of the portions 13 and 14 of the chip mounting groove 3.
5 and 16 are formed. These bolt mounting grooves 15,
Reference numeral 16 denotes a clamp bolt (hereinafter, referred to as a bolt).
Column-shaped heads 5a, 11 formed on the tip side of 5, 11
a are inserted, and the widened portions 17, 18 are inserted therein.
8 is formed to be narrower than the neck portion 5 of the bolt 5, 11.
b, 11b have narrowed portions 19, 20 through which the heads 5a, 11a of the bolts 5, 11 are inserted into the widened portions 15a, 16a at one end side of the narrowed portions 19, 20. Head insertion holes 21 and 22 are formed. On the other hand, wrench holes 5d, 11d for fitting with a wrench for operating the bolts 5, 11 are formed at the tips of the male screw portions 5c, 11c of the bolts 5, 11.

Further, a scale 23 for grasping the amount of movement of the holder 4 and the wedge member 12 in the longitudinal direction of the chip mounting groove 3 is provided on a portion of the outer peripheral surface 2c of the tool main body 2 which is continuous with the chip mounting groove 3. 24 is appropriately engraved.

Here, the amount of movement S (FIG. 1) of the holder 4 and the wedge member 12 in the chip mounting groove 3, that is, the movement of the holder 4 when the holder 4 is moved to the lowermost end of the chip mounting groove 3. The length of the gap formed on the upper surface may be appropriately determined according to the cutting conditions in which the cutting tool can be used and the size of the cutting edge chip 7, but the adjustable range of the cutting depth (cutting width) is sufficiently long. In order to secure and ensure practicality, the cutting edge 9
It is desirable to secure the total length L (FIG. 4) or more. It is desirable that the moving amount of the wedge member 12 be equal to or larger than that of the holder 4.

Next, the operation of the face mill 1 configured as described above will be described. In the face milling machine 1 of the present embodiment, in order to mount the cutting blade tip 7 on the tool body 2, the male threads 5 c, 11 c of the bolts 5, 11 are screwed with the holder 4 and the female threads 4 a, 12 a of the wedge member 12. On the other hand, the heads 5a, 11a of these bolts 5, 11 are inserted from the head insertion holes 21, 22 of the bolt mounting grooves 15, 16 into the widened portions 17, 1.
Then, the bolts 5 and 11 are rotated until the holder 4 and the wedge member 12 enter the holder insertion portion 13 and the wedge insertion portion 14 of the chip mounting groove 3. The operation of the bolts 5 and 11 is performed by using the wrench holes 5 of the male screw portions 5c and 11c.
This is performed using d and 11d.

The holder 4 and the wedge member 12 are in the chip mounting groove 3.
If it enters, the cutting tip 7 is inserted into the recess 6 of the holder 4.
After that, the bolts 5 and 11 are further tightened.
As a result, the holder 4 is firmly pulled into the bottom surface side (radial center side) of the tip mounting groove 3 to restrict its movement, and the cutting edge tip 7 is moved by the wedge action of the wedge member 12 to prevent the tool body 2 from moving. It is firmly pressed in the circumferential direction and fixed.

As is apparent from the above procedure, in the face milling machine 1 of this embodiment, when the bolts 5 and 11 are loosened, the restraint of the holder 4 and the wedge member 12 is released, and the bolts 5 and 11 themselves are also bolted. In order to be able to move along the mounting grooves 15 and 16, the holder 4 and the wedge member 12 are moved in the longitudinal direction of the chip mounting groove 3, that is, in the direction along the cutting edge 9, and the position of the cutting edge 9 is changed. Can be adjusted. Therefore,
For example, when processing is performed in a range where the cutting depth is smaller than the length of the cutting edge 9, all the holders 4 and the wedge members 12 are moved to the tip side of the tool body 2 as much as possible as shown in FIG. While the same processing is performed at each cutting edge 9 as in a general face milling machine, if it is desired to increase the cutting depth of the cutting edge 9, as shown by a two-dot chain line in FIG. 2 or FIG. A part of the holder 4 and the wedge member 12 are moved to the rear end side of the tool body 2 to increase the depth H that can be cut, so that the processing that exceeds the cutting depth that can be covered by one cutting edge 9 can be performed in front. This can be done without changing the milling cutter. In addition, since the amount of movement of the holder 4 and the wedge member 12 can be immediately read on the scales 23 and 24, the position of the cutting edge 9 can be adjusted easily and quickly.

In the case where the cutting depth is small, FIG.
The cutting may be performed while the position of each cutting edge 9 is changed as shown in FIG. 7, but in this case, the cutting edge chip 7 shifted to the rear end side of the tool body 2 does not participate in cutting. Therefore, there is a difference in the life of the cutting tip 7. In this regard,
In the face milling machine 1 of the present embodiment, by adjusting the position of each cutting edge chip 7 according to the required cutting depth, all the cutting edge chips 7 are involved in cutting regardless of the cutting depth. Since the cutting volume of each cutting edge 9 can be kept constant at all times, the life of the cutting tip 7 is homogenized.

In the face mill 1 of the present embodiment,
Since the wedge member 12 is also movable in the same direction as the holder 4, even when the cutting tip 7 is moved, the bolt 11
And the positional relationship between the cutting edge chip 7 and the holder 4 can be kept the same, so that the clamp state can be kept constant irrespective of the position of the cutting edge chip 7 and the mounting accuracy of the cutting edge chip 7 can be high. Can be maintained. By the way, when the wedge member 12 is not moved, the moving range of the cutting edge chip 7 is limited, and there is a possibility that only a very short distance can be adjusted. In addition, a change between the tightening position of the wedge member 12 and the position of the cutting edge chip 7 may occur. Therefore, there is a great possibility that the clamping state changes and the mounting accuracy of the cutting edge chip 7 is degraded.

Here, in the present embodiment, a case where the present invention is applied to a face milling machine is particularly described. However, the present invention is not limited to this, and can be applied to various cutting tools such as an end mill and a side cutter. It is. In addition, the holder 4
The configuration in which the wedge member 12 and the wedge member 12 can be moved is not limited to the illustrated embodiment, and various other embodiments can be considered. For example, the one shown in FIG. 6 is such that an adjustment bolt 25 is screwed into one end of the holder 4 so that its head 25a comes into contact with the wall surface 3a of the chip mounting groove 3. The cutting load applied to the cutting edge tip 7 is received by the wall surface 3a while changing the position of the holder 4 by increasing or decreasing the amount of screwing into the cutting edge 4. In the example shown in FIG. 6, the cutting blade tip 7 is fixed to the holder 4 with the bolt 26, while the holder 4 is pressed by the wedge member 12, and the cutting blade tip 7 has a substantially triangular shape. Although this embodiment is also different from the embodiment shown in FIGS. 1 to 5, such a difference is naturally included in one embodiment of the cutting tool to which the present invention is applied.

Further, the mounting structure of the bolts 5 and 11 for tightening the holder 4 and the wedge member 12 is not limited to the illustrated embodiment. For example, while the heads 5a and 11a are directed to the outer peripheral side of the tool body 2, T-slot nuts are inserted into the chip mounting grooves 15 and 16, and these nuts and the male screw portions 5c are inserted.
11c may be screwed.

[0019]

As described above, according to this invention, the cutting width by the cutting edge can be increased or decreased by moving the holder of the cutting edge tip in the direction along the cutting edge.
The range of the cutting width that can be covered by one cutting tool is expanded, whereby the number of tools to be prepared at a manufacturing site or the like is reduced, and the labor and cost of tool management are reduced. In addition, since the cutting width of the tool body can be changed, the cutting width can be adjusted so that all the cutting edges are always involved in the cutting regardless of the size of the cutting width. An excellent effect is obtained that the life of the steel is made uniform. further,
Since the pressing member is also movable, the clamped state of the cutting edge tip and the holder can always be kept constant regardless of the position of the cutting edge tip, and thereby the moving amount of the holder can be sufficiently secured. In addition, the mounting accuracy of the cutting edge tip can be maintained with high accuracy. When the scale is provided, the amount of movement of the holder and the pressing member can be easily grasped and the position of the cutting edge tip can be quickly adjusted, so that the time and cost required for setup can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged side view showing a configuration around a cutting edge tip according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state where the position of a cutting blade tip is changed from the state shown in FIG. 1;

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an axial sectional view of the face mill according to the embodiment of the present invention;

FIG. 5 is a bottom view of the face mill according to the embodiment of the present invention;

FIG. 6 is a diagram showing a modification of FIG. 1;

[Explanation of symbols]

 2 Tool body 3 Tip mounting groove 4 Holder 7 Cutting edge tip 9 Cutting edge ridge 12 Wedge member (pressing member) 23, 24 Scale

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroaki Hayashizaki 1511 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Pref. Mitsubishi Materials Corporation Tsukuba Works (56) Reference Real Opening 2-43119 (JP, U)

Claims (4)

(57) [Scope of request for utility model registration] 1. A tool mounting groove is formed in an outer peripheral portion of a tool main body, and a holder is provided in the chip mounting groove with a cutting edge tip having its cutting edge protruding from the outer circumference of the tool main body. A cutting tool, wherein at least one of the cutting blade tip and the holder is pressed in a circumferential direction of the tool body by a pressing member inserted into the tip mounting groove, and A tool and the pressing member are mounted movably in a direction along the cutting edge ridge of the cutting edge tip , and the cutting
A cutting tool characterized in that the position of the tape is adjustable in the direction along the cutting edge. 2. A scale for measuring a moving amount of the holder is provided on at least one of an outer peripheral portion of the tool main body and the holder.
The described cutting tool. 3. The cutting device according to claim 1, wherein a scale for measuring a moving amount of the pressing member is provided on at least one of an outer peripheral portion of the tool body and the pressing member. tool. 4. The cutting tool according to claim 1, wherein the amount of movement of the holder is at least as long as the entire length of the cutting edge of the cutting edge tip.