JPH0976111A - Indexable milling tools - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a rolling tool capable of easily and quickly attaching / detaching the cutting edge tip, in addition to preventing the cutting edge tip from popping out, and requiring no recessed portion on the cutting edge tip so that the strength does not decrease. . SOLUTION: In the outer peripheral portion of the tool body 1 of the face milling cutter,
A tip mounting groove 2 that opens to the tip end surface 1a and the outer peripheral surface 1b of the tool body 1 is formed, and a cutting edge tip 3 is inserted into this tip mounting groove 2. The upper surface 7 of the cutting edge tip 3 is pressed down by the wedge member 6 fixed to the tool body 1 by the clamp bolt 21, and the lower surface 9 of the cutting edge tip 3 is
Tip seating surface 31 of holder 30 fixed to tool body 1
It is clamped and fixed to. The tip seating surface 31 of the holder 30 is extended to the outside of the tool body 1 with respect to the lower surface 9 of the cutting blade tip 3, and the tip of this tip seating surface 31 has a direction of centrifugal force acting on the cutting blade tip 3. A convex portion T which is engageable with the cutting blade tip 3 and protrudes upward is provided in a direction (opposite direction) opposite to the (arrow C direction).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type milling tool such as a face mill, and more particularly to a throw-away type milling tool suitable for cutting a soft material such as an aluminum alloy.

[0002]

2. Description of the Related Art In cutting a soft material such as an aluminum alloy, a much higher cutting speed than that of a normal steel material is required in order to realize good machining accuracy and high productivity. For this reason, the number of revolutions of the cutting tool used for machining is also set to a high-speed range from several thousand rpm, sometimes exceeding 10,000 rpm.

By the way, when a cutting tool is rotated in such a high speed region, in a throwaway type rolling tool having a structure in which a cutting blade tip is pressed and fixed by a wedge member, a strong centrifugal force is exerted on the cutting blade tip. This may cause the cutting edge tip to fly out from the tip mounting groove of the tool body.

Therefore, there has been conventionally proposed a throw-away type rolling tool having a function of surely preventing the cutting edge tip from popping out. Here, three typical examples (1), ( This will be described with reference to 2) and (3). In addition,
Reference (1) refers to Japanese Utility Model Laid-Open No. 62-68712, and (2) and (3) refer to Japanese Patent Application No. 3/2004 related to the applicant's application.
See the specification of -291776 and the specification of Japanese Utility Model Application No. 3-91293.

(1) As shown in FIGS. 15 and 16,
The front milling cutter 100 is configured such that a cutting edge tip 103 inserted into a tip mounting groove 102 of a tool body 101 is pressed in a circumferential direction of the tool body 101 by a wedge member 105 tightened by a clamp bolt 104.
Then, the wall surface 102 facing the circumferential direction of the chip mounting groove 102.
By the pin 106 being driven into the a and the tip portion thereof being projected, the convex portion 107 is formed on the wall surface 102a, while the cutting blade tip 103 abutting on the wall surface 102a.
A concave portion 109 that fits into the convex portion 107 is formed on the lower surface 108 of the. The cutting blade tip 103 is pressed by the wedge member 105 in a state where the convex portion 107 and the concave portion 109 are fitted to each other, so that the tool body 1 of the cutting blade tip 103 is pressed.
It is designed to prevent the outer peripheral surface from protruding toward the outer peripheral side.

(2) As shown in FIGS. 17 and 18,
In this face milling cutter 110, a cutting blade tip 113 is inserted into a tip mounting groove 112 formed in a tool body 111,
The cutting blade tip 113 is inserted into the tip mounting groove 112 by a wedge member 115 that is inserted between one of the two wall surfaces 114a and 114b facing the circumferential direction of the tip mounting groove 112 and the cutting blade tip 113. The other wall 11
4b is pressed. It should be noted that reference numeral 115a indicates the tip surface of the tool body 111, and reference numeral 115b indicates the tool body 111.
Shows the outer peripheral surface of the.

The cutting blade tip 113 is formed in a rectangular flat plate shape, and has an upper surface 116 which is a rake surface and side surfaces 117 which are inclined to the upper surface 116 in a regular angle direction and are flank surfaces. And a lower surface 118 parallel to the upper surface 116, and the main cutting edge 119 and the auxiliary cutting edge 120 are sandwiched between the corners of the upper surface 116 at the intersection ridge of the upper surface 116 and the side surface 117.
Are formed alternately. Further, in the central portion of the upper surface 116 of the cutting blade tip 113, the concave portion 1 having a rectangular shape in plan view is formed.
21 are formed.

The tip mounting groove 112 has a tip insertion portion 122 into which the cutting edge tip 113 is inserted, and the wedge member 11.
5 has a wedge insertion portion 123, and the tip insertion portion 122 has a wall surface 114b that contacts the upper surface 116 of the cutting blade tip 113 and a positioning reference that contacts two adjacent side surfaces 117 of the cutting blade tip 113. And surfaces 125 and 126. The wall surface 11 is provided at the center of the wall surface 114b.
A convex portion 127 having a quadrangular cross-section protruding from 4b is formed, and the cross-sectional dimension of the convex portion 127 and the amount of protrusion from the wall surface 114b are set to be slightly smaller than the cross-sectional dimension and depth of the concave portion 121 of the cutting blade tip 113.

On the other hand, the wedge insertion portion 12 of the chip mounting groove 112
Reference numeral 3 denotes the wall surface 114a that contacts the reference surface 115a of the wedge member 115, and the relief surface 1 that faces the wall surface 114a.
29, and the wall surface 114a extends to the rear end side (upper side in FIG. 17) of the tool body 111 while keeping a constant distance from the wall surface 114b of the tip insertion portion 122. Further, the distance between the wall surface 114a and the escape surface 129 is formed to be slightly larger than the distance from the reference surface 115a of the wedge member 115 to the pressing surface 115b. The wedge member 115a is pulled toward the bottom surface 123a side of the wedge insertion portion 123 by the clamp bolt 130 screwed into the female screw portion 115c, so that the cutting edge tip 113 is pressed toward the wall surface 114b. In addition, the wedge member 115 has a wedge insertion portion 123.
Is formed shorter than the entire length of the wall surface 114a in the longitudinal direction, whereby the wedge member 115 is movable in the wedge insertion portion 123 along the wall surface 114a.

According to the above construction, the wedge member 115 is released from the circumferential pressing of the cutting blade tip 113, and then the wedge member 115 is moved upward along the wedge insertion portion 123 (the wedge member 1).
15 is a direction that intersects the insertion direction and the chip mounting groove 12
2) by moving the wedge member 115 from the extension of the surface of the cutting blade tip 113 facing in the circumferential direction, so that the cutting blade tip 113 can move in the circumferential direction. Can be set. As a result, the concave portion 121 and the convex portion 12 formed between the cutting blade tip 113 and the wall surface 114b facing the circumferential direction of the tip mounting groove 112.
7 can be attached and detached, and the cutting edge tip 113 can be formed without the trouble of moving the wedge member 115 largely in the insertion direction.
Can be attached and detached.

(3) As shown in FIGS. 19 and 20,
In this face mill 140, the chip mounting groove 14
2 has a substantially disc-shaped tool body 141, a pair of upper and lower surfaces 143 and 144 facing in opposite directions, and the upper and lower surfaces 14
3, 144, and a flat plate-shaped cutting edge tip 146 having a side surface 145 arranged around the circumference of the blades 144. It should be noted that reference numerals 141a and 141b indicate the tip end surface and the outer peripheral surface of the tool body 141, respectively. Tip mounting groove 142
Is formed along one side of the bottom surface 147 of the tool body 141 that faces the substantially circumferential direction, and the tool body 141 is formed along one side of the bottom surface 147.
And an axial constraining surface 148 that faces substantially the axial direction. The cutting edge tip 146 is attached to the tool body 141 with its upper surface 143 abutting on the bottom surface 147 of the tip mounting groove 142 and one side surface abutting on the axial restraining surface 148 of the tip mounting groove 142. ing. A protrusion 150 extending in a direction intersecting with the axial restraint surface 148 is formed on the axial restraint surface 148, and a concave portion 151 capable of fitting with the convex portion 150 is formed on a side surface of the cutting edge tip 146 that abuts the axial restraint surface 148. Is formed. Reference numeral 152 indicates a clamp bolt. The clamp bolt 152 is screwed into the tool body 141, and the cutting edge tip 146 is pressed against the tool body 141 by the wedge member 153 to clamp the tool body 141.

According to the above configuration, the concave portion 151 and the convex portion 15
By fitting 0, the cutting edge tip 146 is prevented from protruding in the substantially radial direction of the tool body 141. Since the fitting direction of the concave portion 151 and the convex portion 150 is set to intersect with the axial restraining surface 148 of the tip mounting groove 142, the cutting blade tip 146 is attached when the cutting blade tip 146 is attached and detached. The protrusion 150 can be attached to and detached from the recess 151 only by moving it along the bottom surface 147 of the chip mounting groove 142. Accordingly, the cutting edge tip 146 is projected in a direction intersecting the bottom surface 147 of the tip mounting groove 142.
Since it is not necessary to move the cutting edge tip 146 by the wedge member 153 or the like, it is not necessary to move the cutting edge tip 146 by more than the protrusion amount.
2 cutting edge tip 146 even when pressed against bottom surface 147
Can be easily attached and detached. In the above-mentioned prior arts (2) and (3), a convex portion may be provided on the cutting edge tip side and a concave portion may be formed on the tool body side so as to fit with the convex portion.

[0013]

However, the above-mentioned related arts (1), (2) and (3) have the following problems, respectively. That is, although the item (1) has a substantially sufficient effect in preventing the cutting edge tip from popping out, the workability when attaching and detaching the cutting edge tip is poor, and there is still room for improvement in this respect. That is, since the convex portion protrudes from the wall surface of the chip mounting groove, to attach / detach the cutting edge chip to / from the chip mounting groove,
It is necessary to make a gap between the side surface of the wedge member and the wall surface of the tip mounting groove, which exceeds the sum of the thickness of the cutting edge tip and the protrusion amount of the convex portion. However, since the inclination angle of the side surface of the wedge member with respect to the wall surface of the tip mounting groove is small, in order to open a gap until the cutting blade tip can be detached, the clamp bolt is rotated a considerable number of times to move the wedge member to that position. This requires a large movement in the insertion direction, and if this work is carried out for all cutting blade tips, the working time will increase significantly.

In the case of (2), the wedge member does not have to be largely moved in the inserting direction thereof, and (3)
In the case of the above, it is not necessary to move the cutting blade tip in the direction intersecting the bottom surface of the tip mounting groove by more than the protruding amount of the convex portion, and the cutting blade tip can be attached / detached. Workability is good. However, the above (1), (2)
Since both of (3) and (3) form a concave portion or a convex portion on the cutting edge tip, the processing cost increases due to this formation, and the ISO standard cutting edge tip cannot be used as it is, and further the concave portion is formed. In this case, there is a problem that the strength of the cutting edge tip becomes low.

Further, in any of the above (1), (2) and (3), as shown in FIG. 21, the tip seating surface 161a on the side of the tool body or the wedge member 161 with which the lower surface 160a of the cutting blade tip 160 abuts. Is the lower surface 1 of the cutting tip 160
Since it is pulled inward from the tool body with respect to 60a (only the amount of overhang indicated by the symbol D is equal to the cutting edge tip 16).
The lower surface 160a of No. 0 projects further outward than the chip seating surface 161a), and the clamping strength of the cutting edge chip 160 is low. That is, since the cutting blade tip 160 is not supported on the entire lower surface 160a,
The cutting blade tip 160 that receives a large force from the work material cannot be firmly supported, and the cutting blade tip 160 is displaced.

The present invention has been made in view of the above problems of the prior art. In addition to the effect of preventing the cutting edge tip from popping out, the cutting edge tip can be easily and quickly attached and detached, and in advance. It is an object of the present invention to provide a throw-away type rolling tool which does not require machining of a concave portion or a convex portion on a cutting blade tip and further can enhance the strength and clamping strength of the cutting blade tip.

[0017]

According to the present invention for achieving the above object, a cutting blade tip is inserted into a chip mounting groove formed in a tool body, and the cutting blade tip is arranged in a circumferential direction of the chip mounting groove. In a throw-away type rolling tool, which is pressed and fixed to a chip seating surface by a wedge member inserted between one of the two wall surfaces facing each other and the cutting blade chip, the chip seating surface is Extending to the outer side of the tool body from the lower surface of the cutting blade tip, at the tip of the extended tip seating surface, with the cutting blade tip in a direction opposing the direction of centrifugal force acting on the cutting blade tip. It is characterized in that an engaging convex portion is provided.

The tip seating surface is the other wall surface of the two wall surfaces facing the circumferential direction of the chip mounting groove, or the two wall surfaces facing the circumferential direction of the cutting edge chip and the chip mounting groove. A holder may be inserted between the other wall surface and the tip seating surface may be an upper surface of the holder. Here, as the holder, there is a simple flat sheet or a supporter having a positioning groove for receiving the cutting edge tip. Further, the protrusion is provided at a position of the tip seating surface that engages with the flank of the main cutting edge of the cutting blade tip, and the protrusion is the tip seating surface of the tip seating surface. It may be provided at a position that engages with the flank of the sub cutting edge that is not used for cutting among the plurality of sub cutting edges of the blade tip.
And the height dimension of the said convex part is 0.01 mm-0.5 m.
It is preferably within the range of m.

The operation of the present invention will be described below. In the invention according to claim 1, the tool body is rotated with the cutting blade tip attached to the tool body by the wedge member, and the workpiece is cut by the cutting blade tip. At this time, a centrifugal force acts on the cutting blade tip so as to jump out to the outer peripheral side of the tool body, but in the present invention, since the protruding portion protruding upward is provided at the tip of the tip seating surface, the cutting blade It is possible to prevent the chips from popping out. Here, the convex portion is engageable with the cutting edge tip in a direction opposite to the direction of centrifugal force acting on the cutting edge tip or in a direction intersecting the direction of the centrifugal force at an acute angle. The cutting edge tip does not require any processing such as recesses or protrusions, and the ISO standard cutting edge tip can be used as it is. Further, since the chip seating surface protrudes outward of the tool body from the lower surface of the cutting blade chip and the cutting blade chip is supported by the chip seating surface over the entire lower surface thereof, the clamping strength is high.

By providing the convex portion directly on the chip seating surface of the tool body as in the second aspect of the present invention, the holder is not required and the number of parts and the cost can be reduced. . In the invention according to claim 3, a holder is provided between the wall surface of the tip mounting groove and the cutting blade tip, the tip seating surface of the holder is extended, and the cutting blade tip is provided at the tip of the tip seating surface. A convex portion that engages with the cutting blade tip is provided in a direction that intersects the direction of the centrifugal force that acts on the. As a result, ISO
Standard (standard type) cutting blade tips and tool bodies can be used as they are. In the invention according to claim 4, the holding tool can position the cutting edge tip in addition to the function of preventing the tip from popping out. According to a fifth aspect of the present invention, the position where the convex portion is provided can be a position where the tip seating surface is engaged with the flank of the main cutting edge of the cutting edge tip. In this case, the position where the convex portion is provided is such that the convex cutting portion does not interfere with the work material during cutting, and the position where the convex portion is engaged with a part of the flank of the auxiliary cutting edge side of the cutting blade tip that is not used. Is. That is, it is preferable that the convex portion is provided at a position that engages with the flank of the main cutting edge of the cutting edge tip other than the cut portion into the work material. In order to reliably prevent the interference, the size (volume) of the convex portion is appropriately set according to its height dimension, thickness dimension in the radial direction of the chip, and the like. Further, in the present invention, the cutting edge tip is supported by the reverse overhang mode, but this reverse overhang amount also reliably prevents the interference, and the convex portion due to the engagement of the convex portion with the cutting edge tip. Is set so that the breakage strength of is higher than necessary. Claim 6
According to the invention described in (1), by providing the convex portion at a position that engages with the flank of the auxiliary cutting edge that is not used for cutting, it is possible to reliably prevent the convex portion from interfering with the work material during cutting. According to the invention of claim 7, the height dimension of the convex portion is 0.
If it is smaller than 01 mm, it is difficult to obtain the desired chip pop-out prevention effect, while if it is larger than 0.5 mm, the above-mentioned problems may occur due to the interference, or the convex portion is easily broken at the root due to the engagement with the cutting blade tip. Therefore, 0.01mm
The range of 0.5 mm is preferable. More preferably, 0.
It is in the range of 05 mm to 0.1 mm.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a view showing a configuration around a cutting edge tip as seen from the tip end side of a first embodiment of a throw-away type rolling tool of the present invention, and FIG. 2 is a side view of FIG. 1 seen from the right direction, FIG. 3 is an enlarged view of an essential part of FIG. 1, FIG. 4 is a plan view of the cutting edge tip shown in FIG. 1 and the like as seen from above, and FIGS. 5A and 5B are holding members shown in FIG. It is the top view and side view which looked at a tool from the upper part.

As shown in FIGS. 1 and 2, in a face mill S as an example of a throw-away type rolling tool, an opening is formed in the outer peripheral portion of the tool body 1 at the tip surface 1a and the outer peripheral surface 1b of the tool body 1. A chip mounting groove 2 is formed, and a cutting blade chip 3 is inserted into this chip mounting groove 2. In addition,
A plurality of chip mounting grooves 2 are provided at equal intervals in the circumferential direction of the tool body 1, but only one is shown in the drawing. The upper surface (rake surface) 7 of the cutting edge tip 3 is a wedge member 6
The lower surface 9 of the cutting edge tip 3 is pressed by and held by the tip seating surface 31 which is the upper surface of the holder 30 fixed to the tool body 1. Of the wall surfaces 4, 5 facing the circumferential direction of the chip mounting groove 2 of the tool body 1, one wall surface 4 is in contact with the reference surface 6a of the wedge member 6, and the other wall surface 5 is provided with the lower surface 32 of the holder 30. Abutting.

As described above, the cutting edge tip 3 has the wall surface 4 of one of the wall surfaces 4, 5 facing the circumferential direction of the tip mounting groove 2.
The chip seating surface 31 of the holder 30 is formed by the wedge member 6 inserted from the outer peripheral side of the tool body 1 between the cutting blade tip 3 and the cutting edge tip 3.
Is pressed. The holder 30 is fixed to the other wall surface 5 of the tool body 1 facing the circumferential direction of the chip mounting groove 2 by a holder fixing bolt 19. Of course, the lower surface 9 of the cutting edge tip 3 may be directly brought into contact with the tool body 1 without providing the holder 30 (see FIG. 7 described later).
And FIG. 8). Further, although the holder 30 is a sheet formed in a simple flat plate shape in the present embodiment, the holder 30 is not limited to this, and a supporter having a positioning groove for receiving the cutting blade tip 3 can also be used (described later). 13 and 14).

As shown in more detail in FIG. 4, the cutting edge tip 3 is formed by molding a hard material such as cemented carbide or ceramics into a rectangular flat plate shape, and has an upper surface 7 serving as a rake surface.
And side surfaces 8 which are inclined to the upper surface 7 in the direction of a regular angle and serve as flanks, and a lower surface 9 parallel to the upper surface 7. Four main cutting edges 10a to 10d and sub cutting edges 11a to 1 are sandwiched between the corners of the upper surface 7 at the intersection ridge of the upper surface 7 and the side surface 8.
1d are alternately formed, and a sub cutting edge 11 is provided on one end side of the side surface 8.
A secondary flank 12 that is continuous with a to 11d is formed. In the state of FIG. 4, the main cutting edge 10a on the right side and the sub cutting edge 1 on the lower right side
A work material (not shown) is cut with 1a, and the cutting edge tip 3 is rotated by 90 ° when the main cutting edge 10a and the sub cutting edge 11a are worn out more than a specified amount, and the next main cutting edge 10 is cut.
b and the sub cutting edge 11b are used, all the main cutting edges 10a to
When the 10d and the sub cutting edges 11a to 11d are worn, the cutting edge tip is replaced with a new one by a positive throwaway type.

Further, as shown in FIGS. 1 to 3, the tip mounting groove 2 has a tip insertion portion 15 into which the cutting blade tip 3 and the holder 30 are inserted, and a wedge insertion portion 16 into which the wedge member 6 is inserted. The tip insertion portion 15 has the wall surface 5 that abuts the lower surface 32 of the holder 30, and the positioning reference surfaces 13 and 14 that abut the two adjacent side surfaces 8 of the cutting edge tip 3.
And In addition, the wedge insertion portion 16 of the chip mounting groove 2
The side wall surface 4 has a reference surface 6 as one side surface of the wedge member 6.
a is in contact, and the pressing surface 6b as the other side surface of the wedge member 6 is in contact with the upper surface 7 of the cutting blade tip 3.

The wedge insertion portion 16 of the chip mounting groove 2 has the wall surface 4 that comes into contact with the reference surface 6a of the wedge member 6 and the relief surface 20 that faces the wall surface 4, and the wall surface 4 is the chip insertion portion 15 It extends to the rear end side (left side in FIG. 1) of the tool body 1 while keeping a constant distance from the wall surface 5. The distance between the wall surface 4 and the relief surface 20 is formed to be slightly larger than the distance from the reference surface 6a of the wedge member 6 to the pressing surface 6b.
The wedge member 6 is pressed against the reference surface 6a.
b is in contact with the upper surface 7 of the cutting edge tip 3 inserted in the tip insertion portion 15, and the reference surface 6a is the wall surface 4 of the wedge insertion portion 16.
In this state, the cutting edge tip 3 is pressed toward the holder 30 by being pulled toward the bottom surface 6c side of the wedge insertion portion 16 by the clamp bolt 21 screwed into the tool body 1 side. Hereinafter, the moving direction of the wedge portion 6 accompanying the operation of the clamp bolt 21 is referred to as the inserting direction of the wedge member 6.
More specifically, the clamp bolt 21 has a male screw portion 21a screwed to the female screw portion 6d of the wedge member 6 and a female screw portion 70 of the tool main body 1 and is twisted in a direction opposite to the male screw portion 21a. The male screw portion 21b is provided. A wrench hole 25a that fits into a wrench (not shown) is formed in the head of the clamp bolt 21.

Next, the characteristic part of this embodiment will be described. As shown in FIGS. 1 to 5, the tip seating surface 31 of the holding portion 30 extends outward of the tool body 1 from the lower surface 9 of the cutting edge tip 3 to form a reverse overhang. Further, a convex portion T projecting upward is integrally provided at the tip of the extended chip seating surface 31, and the convex portion T
Can be engaged with the cutting edge tip 3 in a direction (the opposite direction in this embodiment) that opposes the direction of the centrifugal force acting on the cutting edge tip 3 (direction of arrow C). The extension amount (reverse overhang amount) of the chip seating surface 31 is set so that the convex portion T does not interfere with the work material (not shown). Further, the convex portion T is provided at a position of the tip of the extended tip seating surface 31 that engages with the sub flank 12 of the sub cutting edge 11d of the cutting blade tip 3. Here, the auxiliary cutting edge 11 of the cutting edge tip 3
Although there are four a to 11d, the auxiliary cutting edge engaging with the convex portion T is
The sub cutting edge 11d on the upper right side that is not used for cutting in the state of FIG.
It is. The protrusion T may be integrally formed when the holder 30 is formed, or may be fixed to the holder 30 with a strong adhesive after the holder 30 is formed. In FIG. 5, reference numerals 33 and 34 denote side surfaces inclined at substantially the same angle as the side surface 8 and the sub clearance surface 12 of the cutting edge tip 3, and reference numeral 35 denotes a bolt through which the holder fixing bolt 19 penetrates. It's a hole.

Next, the operation of the face mill S configured as above will be described. The cutting blade tip 3 and the wedge member 6
It is attached to the tool body 1 by. If the work material (not shown) is a soft material such as aluminum alloy, move the tool body 1 to the arrow A
The workpiece (not shown) is cut by the cutting blade tip 3 while rotating at high speed in the direction. At this time, the main cutting edge 1 used for cutting
0a and the sub cutting edge 11a are the right side and the lower right side in FIG. Therefore, the convex portion T does not interfere with the work material. The cutting edge tip 3 is subjected to a centrifugal force that tends to jump to the outer peripheral side of the tool body 1, but in the present invention, the tip seating surface 3
The tip of the cutting edge tip 1 is provided with a convex portion T which is engageable with the cutting edge tip 3 in a direction opposite to the direction of the centrifugal force acting on the cutting edge tip 3 and protrudes upward. 3 can be prevented from popping out.

In the face mill S of this embodiment,
To remove the cutting edge tip 3, clamp bolt 2
1 is loosened and the pressing of the cutting edge tip 3 by the wedge member 6 is released. Then, the wedge member 6 is moved in the direction opposite to the insertion direction so that the reference surface 6a thereof follows the wall surface 4, and here, the cutting blade tip 3 is moved in the direction of arrow B in FIGS. 2 and 4 and held. Remove from the tool 30. When the cutting blade tip 3 is attached, the auxiliary male screw portion 21b of the clamp bolt 21 is screwed into the tool body 1 with the wedge member 6 screwed onto the male screw portion 21a of the clamp bolt 21.

In the present embodiment, the cutting edge tip 3 does not require any processing such as a concave or convex portion, and the standard type cutting edge tip 3 and the tool body 1 can be used as they are, and the cutting edge tip 3 The strength does not decrease. Also,
Since the chip seating surface 31 that abuts the lower surface 9 of the cutting blade tip 3 projects toward the outside of the tool body 1 than the lower surface 9 of the cutting blade tip 3, the cutting blade that receives the reaction force of the cutting force from the work material. The chip 3 can be stably supported over the entire lower surface thereof, and the clamping strength is high. The height dimension of the convex portion T from the chip seating surface 31 is preferably in the range of 0.01 mm to 0.5 mm. The reason is that if it is smaller than 0.01 mm, it is difficult to obtain the desired effect of preventing the chip from popping out, while if it is larger than 0.5 mm, the above-mentioned problems due to interference occur and the convex portion T has the cutting edge chip 3. This is because the engagement with and makes it easier to break at the root (the breakage strength of the convex portion becomes smaller). More preferably, it is in the range of 0.05 mm to 0.1 mm.

FIG. 6 is a view corresponding to FIG. 5 for explaining the second embodiment of the throw-away type rolling tool of the present invention. In this embodiment, as shown in FIGS. 4 and 6, the tip seating surface 31 of the holder 30 extends outward of the tool body 1 from the lower surface 9 of the cutting blade tip 3, and the tip seating surface 31 At the tip of 31, a direction intersecting with the direction of the centrifugal force acting on the cutting edge tip 3 (direction of arrow C) at an acute angle (see FIG. 6)
A convex portion T which can be engaged with the cutting edge tip 3 and protrudes upward
5 is the same as that of FIG. 5, except for the position where the convex portion T is provided. That is, by providing the convex portion T at a position where the tip of the tip seating surface 31 of the holder 30 engages with the flank 8 of the main cutting edge 10a of the cutting edge tip 3, the same as in the first embodiment described above. A cutting blade tip 3
It is possible to obtain the effect of preventing the chip from popping out without processing the concave portion on the. In this embodiment, the convex portion T is provided at a position corresponding to the entire area of the main cutting edge 10a.
In order to prevent interference between the work and the work material (not shown),
As shown by the wavy line N in FIG. 6A, the convex portion T is a part of the flank 8 on the side of the auxiliary cutting edge 11d of the holder 30 which is not used for cutting the main cutting edge 10a of the cutting edge tip 3. It is preferable to provide it at a position that engages with. That is, it is preferable that the convex portion T is provided at a position that engages with the flank surface of the main cutting edge 10a of the cutting edge tip 3 other than the cut portion into the work material.

FIG. 7 is a view corresponding to FIG. 3 for explaining a third embodiment of the throw-away type rolling tool of the present invention. In this embodiment, the tip mounting groove 2 of the tool body 1 is composed of a tip insertion portion 15 for accommodating only the cutting edge tip 3 and a wedge member insertion portion 16, and the lower surface 9 of the cutting edge tip 3 is It is directly pressed against the chip seating surface 5 of the tool body 1 without using a holder. Other configurations are similar to those of the first and second embodiments. That is, the present embodiment example is one in which the present invention is applied to a tip clamp structure having no holder. More specifically, the tip seating surface 5 of the tool body 1 is extended to the outer side of the tool body 1, and the tip of the tip seating surface 5 has the main cutting edge of the cutting edge tip 3 at the tip thereof, as in FIG. 5 or FIG. A convex portion T that engages with the flank of the (or the sub-cutting edge) is provided. In the present embodiment, by providing the convex portion T on the tool body 1, a holder is not required, and the number of parts and the cost can be reduced accordingly.

FIG. 8 is a view corresponding to FIG. 5 for explaining a fourth embodiment of the throw-away type rolling tool of the present invention. In this embodiment, the upper surface 7 of the cutting edge tip 3 is pressed against one wall surface 25 of the tool body 1 by the wedge member 26. The pressing surface 26b, which is one side surface of the wedge member 26, is a tip seating surface, and a convex portion T is integrally provided at the tip of the tip seating surface 26b. Reference numeral 26a indicates a reference surface of the wedge member 26. Other configurations are the same as those of the first and second embodiments.

In each of the above embodiments, the seating surface of the tip is extended and the extension is provided with the convex portion.
Not limited to this, as shown in FIG. 9, the lower end portion of the cutting blade tip 37 on the outer side of the tool body is cut out to form a step portion 37a, while the holder or the tip seating surface 38a of the tool body 38 is formed. The convex portion T that engages with the step portion 37a.
May be formed. Also in this case, the cutting edge tip 37 is stably supported by the tip seating surface 38a, and the clamping strength is also high. Further, it is possible to reliably prevent the interference between the convex portion T and the work material.

FIG. 10 is a view corresponding to FIG. 1 for explaining a fifth embodiment of the throw-away type rolling tool of the present invention, FIG. 11 is a right side view of FIG. 10, and FIG. 12 is FIG. 13A is a plan view of the cutting blade tip of FIG.
10B and 10C are a plan view, a front view, and a side view of the holder shown in FIGS. 10 and 11, respectively. In this embodiment, a triangular plate-shaped cutting blade tip 43 is used as the cutting blade tip, and the holder 50 is not a mere plate-shaped sheet, but a supporter having a positioning groove 51 for positioning the cutting blade tip 43. Is. The cutting blade tip 43 is shown in FIG.
As shown in 2, the three main cutting edges 44a, 44b, 44c
And the three sub-cutting edges 45a, 45b, 45c formed between the main cutting edges 44a, 44b, 44c. When one main cutting edge 44a and the sub-cutting edge 45b are worn, the rotational position is changed to 120. It is a positive throw away type that is used by fixing it to the tool body by shifting it.

More specifically, the holder 5 is attached to the tool body 41.
The holder insertion groove 42b is formed so as to match the outer shape of 0, and the holder 50 is inserted into the holder insertion groove 42b. A bolt hole 52 is formed in a substantially central portion of the holder 50, and the holder 50 is fixed to the tool body 41 by a holder fixing bolt 54 that penetrates the bolt hole 52 and is screwed into the tool body 41. There is. The holding tool 50 is formed with a V-shaped positioning groove 51 in a plan view for abutting and positioning the two side surfaces of the cutting blade tip 43. Also, the holder 5
In 0, a portion corresponding to the lower edge of the cutting blade tip 43 is a groove 53 so that the lower edge of the cutting blade tip 43 does not contact the holder 50.

The wedge member 47 is fixed to the tool body 41 by a clamp bolt 48, and a reference surface 47a as one side surface of the wedge member 47 is one of the wall surfaces 42a and 42b facing the circumferential direction of the tool body 41. The pressing surface 47b, which is in contact with the wall surface 42a and serves as the other side surface of the wedge member 47, presses the upper surface 46 of the cutting blade tip 43. This allows
The cutting blade tip 43 is the upper surface (chip seating surface) 5 of the holder 50.
It is pressed against 5 and fixed.

The tip seating surface 55 of the holder 50 is extended to the outside of the tool main body 41, and a convex portion T is integrally provided at the tip of the extended tip seating surface 55. Is to engage with the flank of the central part of the main cutting edge 44a of the cutting edge tip 43, and as in FIG.
Prevents popping out due to centrifugal force acting on 3. In the front milling cutter of this embodiment, in order to attach / detach the cutting edge tip 43, the clamp bolt 48 is loosened to release the pressing of the cutting edge tip 43 by the wedge member 47. Subsequently, the wedge member 47 is moved in the direction opposite to the inserting direction of the wedge member 47 so that the reference surface 47a thereof follows the wall surface 42a of the tool body 41, and here, the outer peripheral portion of the cutting blade tip 43 is lifted. The engagement with the convex portion T is released, and the protrusion T is moved in the substantially opposite direction and taken out from the holder 50. When the cutting blade tip 43 is attached, the reverse process similar to the above is performed.

FIG. 14 is a view corresponding to FIG. 13, showing a sixth embodiment of the throw-away type rolling tool of the present invention. The example of the present embodiment is different from that of FIG. 13 only in the position where the convex portion T is provided. Convex T is cutting edge tip 4
3, which engages with the secondary flank of the secondary cutting edge 45c which is not used for cutting, and prevents the secondary blade 45c from popping out due to the centrifugal force acting on the cutting edge tip 43, as in the embodiment of FIG.
The reference numerals 61, 62, 63 and 65 are 51 and 5 in FIG.
It is equivalent to 2,53,55.

In each of the above-described embodiments, the face milling cutter having the positive cutting blade tip has been described as an example, but the present invention is not limited to this, and the present invention is also applied to the face milling cutter having the negative cutting blade tip. Applicable. The present invention can be applied not only to face milling cutters but also to end mills and the like.

[0041]

Since the present invention is configured as described above, it has the following effects. In the invention according to claim 1, the cutting blade tip receives a centrifugal force that tends to pop out to the outer peripheral side of the tool body during cutting, but in the present invention, the cutting blade tip acts on the tip of the tip seating surface. The protrusion of the cutting blade tip can be prevented by providing the convex portion that is engageable with the cutting blade tip in the direction opposite to the direction of the centrifugal force and that protrudes upward. Further, the cutting edge tip does not need to be processed into a concave portion, an ISO standard product (standard type) can be used as it is, and the strength of the cutting edge tip does not decrease. Also, since the chip seating surface on the tool body side projects more toward the outer side of the tool body than the lower surface of the cutting blade chip, the cutting blade chip is supported by the chip seating surface over the entire lower surface of the cutting blade chip, thereby improving the clamping strength. Is high. Furthermore, the cutting tip can be easily and quickly removed from the tool body. According to the second aspect of the present invention, by providing the convex portion directly on the tip seating surface of the tool body, the holder is not required, so that the number of parts can be reduced and the cost can be reduced accordingly. In the invention according to claim 3, a holder is provided between the wall surface of the tip mounting groove and the cutting blade tip, the tip seating surface of the holder is extended, and the cutting blade tip is provided at the tip of the tip seating surface. A convex portion that engages with the cutting edge tip can be provided in a direction opposite to the direction of the centrifugal force that acts on the cutting edge tip. Also,
The shape of the holder can be changed only by the convex portion, and the ISO standard type cutting blade tip and tool body can be used as they are. When exchanging the holder, a plurality of holders having a convex portion may be prepared. In the invention according to claim 4, the holding tool can position the cutting blade tip in addition to the function of preventing the cutting blade tip from popping out. As in the invention described in claim 5, the position where the convex portion is provided may be a position where the tip seating surface is engaged with the flank of the main cutting edge of the cutting edge tip. In this case, the convex part should not interfere with the work material,
It is preferable to provide the cutting tip at a position corresponding to a part of the flank of the main cutting edge on the side of the sub cutting edge which is not used. According to the invention described in claim 6, by providing the convex portion at a position that engages with the flank of the auxiliary cutting edge, it is possible to reliably prevent the convex portion from interfering with the work material during cutting. As in the invention according to claim 7, by setting the height dimension of the convex portion in the range of 0.01 mm to 0.5 mm, the desired pop-out prevention effect is ensured and the convex portion is covered with the protrusion. It is possible to reliably prevent interference with the cutting material and damage to the protrusions.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration around a cutting edge tip when a first embodiment of a throw-away type rolling tool according to the present invention is viewed from below.

FIG. 2 is a diagram of FIG. 1 viewed from the right side.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is a plan view of the cutting edge tip shown in FIG. 1 and the like as seen from above.

5A and 5B are respectively a plan view and a side view of the holder shown in FIG. 1 and the like as seen from above.

FIG. 6 is a view, corresponding to FIG. 5, for explaining a second embodiment of the throw-away type rolling tool of the present invention.

FIG. 7 is a view, corresponding to FIG. 3, for explaining a third embodiment of the throw-away type rolling tool of the present invention.

FIG. 8 is a view, corresponding to FIG. 5, for explaining a fourth embodiment of the throw-away type rolling tool of the present invention.

FIG. 9 is a view showing a case where a step portion is provided on the cutting blade tip.

FIG. 10 is a view, corresponding to FIG. 1, for explaining a fifth embodiment of the throw-away type rolling tool of the present invention.

FIG. 11 is a right side view of FIG.

FIG. 12 is a plan view of the cutting edge tip of FIG. 10 seen from above.

13 (a), (b), (c) are respectively FIG.
FIG. 12 is a plan view, front view, and side view of the holder shown in FIG. 11.

FIG. 14 is a view, corresponding to FIG. 13, showing a sixth embodiment of the throw-away type rolling tool of the present invention.

FIG. 15 is a diagram showing an example of an outer peripheral portion of a conventional face milling cutter.

16 is a cross-sectional view showing a configuration around a cutting edge tip of the front milling cutter shown in FIG.

FIG. 17 is a side view showing an enlarged configuration around a cutting edge tip in another conventional face milling cutter.

FIG. 18 is a partial cross-sectional view of the configuration around the cutting edge tip of FIG. 17 as seen from the X direction in FIG.

FIG. 19 is a view showing a state in which a cutting edge chip is mounted in a chip mounting groove of a tool body in still another conventional face milling cutter, as viewed from the direction facing the upper surface of the cutting edge chip.

20 is a view taken in the direction of the arrow Y in FIG.

FIG. 21 is a view showing a conventional technique and showing a relationship between a lower surface of a cutting edge tip and a tip seating surface.

[Explanation of symbols]

S Front milling cutter T Convex part (projection for preventing tip protrusion) 1,41 Tool body 1a Tip surface 1b Outer peripheral surface 2 Tip mounting groove 3,43 Cutting edge tip 4,5,24,25,42a, 42b Wall surface 6,26 , 47 Wedge members 6a, 26a, 47a Reference surface 6b, 26b, 47b Pressing surface 6c Bottom surface 6d, 70 Female screw portion 7, 31, 46 Upper surface 8, 33, 34 Side surface 9, 32 Lower surface 10a-10d, 44a-44c Main cutting Blades 11a to 11d, 45a to 45c Sub cutting edges 12 Sub flanks 13, 14 Positioning reference surface 15 Chip insertion portion 16 Wedge member insertion portion 19 Holding fixture fixing bolts 21, 48 Clamp bolts 21a Male screw portion 21b Sub male screw portion 25a Wrench Hole 30, 50, 60 Holder 35, 52, 62 Bolt hole 51, 61 Positioning groove 53, 63 Groove

Claims (7)

[Claims] 1. A cutting blade tip is inserted into a chip mounting groove formed in a tool body, and the cutting blade tip has one of two wall surfaces facing the circumferential direction of the chip mounting groove and the cutting blade. In a throw-away type rolling tool that is pressed and fixed to a chip seating surface by a wedge member that is inserted between the chip seating surface and the tip seating surface to the outside of the tool body from the lower surface of the cutting blade chip. It is extended, at the tip of the extended tip seating surface is provided with a convex portion engageable with the cutting blade tip in a direction opposite to the direction of centrifugal force acting on the cutting blade tip, A throwaway type rolling tool. 2. The throw-away type rolling tool according to claim 1, wherein the tip seating surface is the other wall surface of the two wall surfaces facing the circumferential direction of the tip mounting groove. 3. A holder is inserted between the cutting edge tip and the other wall surface of the two wall surfaces facing the circumferential direction of the tip mounting groove, and the tip seating surface is the upper surface of the holder. The throw-away type rolling tool according to claim 1. 4. The throw-away type rolling tool according to claim 3, wherein the holder is a supporter having a positioning groove for receiving the cutting edge tip. 5. The protrusion is provided at a position on the tip seating surface that engages with a flank of a main cutting edge of the cutting edge tip. Throw-away type rolling tool described. 6. The convex portion is provided at a position of the tip seating surface that engages with a flank of a sub-cutting edge that is not used for cutting among a plurality of sub-cutting edges of the cutting edge tip. The throw-away type rolling tool according to any one of claims 1 to 4. 7. The height dimension of the convex portion is 0.01 mm to
The throw-away type milling tool according to any one of claims 1 to 6, which is set within a range of 0.5 mm.