JPH11262811A - Throwaway type face milling cutter and throwaway tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finely adjust the protrusion quantity of a cutting edge even in vertical edge type face milling cutter. SOLUTION: In a throwaway tip 6 having a square flat plate-shaped tip body 8, a square face 8A is faced to the side of a tool tip as a flank, a peripheral face 8B is faced to the side of the tool rotation direction T as a face, and the cutting edge 9, which is formed in the intersection ridgeline between these face and flank, is protruded to the tool tip side. In this case, the throwaway tip 6 is detachably secured at the tip mounting seat 5 formed in a tool body 1 rotated around axis 0, and a flat face 10, which is parallel with the thickness direction of the tip body 8, is formed in the peripheral face 8B in the side opposite to another peripheral face 8B, which is taken as the face of the throwaway tip 6, and an adjusting means 7 is provided on the rear side in the tool rotation direction T of the tip mounting seat 5 to be made to abut on and press against the flat face 10 and finely adjust the position of the throwaway tip 6 in this abutting 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 face mill (hereinafter, referred to as "face milling machine") for performing plane cutting on a workpiece.
Called face milling. ) And a throw-away tip (hereinafter referred to as a tip) suitable for use in the face milling machine.

[0002]

2. Description of the Related Art Conventionally, in a face mill of this type, a polygonal flat chip is oriented in the tool rotation direction with a rectangular surface forming a polygon as a rake face, and is disposed around the rectangular surface. One of the peripheral surfaces facing the tool tip side as a flank, and the cutting edge formed at the intersection ridge line of the rake face and the flank is projected to the tool tip side and detachably mounted. The mainstream, but in recent years,
A polygonal rectangular surface of a polygonal flat chip is directed to the tool tip side as a clearance surface, and one of the peripheral surfaces around the rectangular surface is directed to the tool rotation direction as a rake surface, and these rakes are formed. A so-called vertical blade type face milling machine has been used in which a cutting blade formed at an intersection ridge line between a surface and a flank protrudes toward a tool tip side and is mounted on a tip mounting seat of a tool body. However, in such a face mill, the insert is arranged so that the width direction of the insert is along the direction of rotation of the tool, so that the chip mounting rigidity is high, and a portion where the tool body is cut out to mount the insert to the tool body. , The advantages such as high tool rigidity can be obtained.

[0003]

By the way, in such a face mill, in order to finish a plane formed on a work material with high smoothness, particularly in finishing, etc., a plurality of inserts attached to a tool body are required. , The amount of protrusion of the cutting blade protruding toward the tool tip side must be equal, and this is the same in the case of the above-mentioned vertical blade type face milling machine. In this regard, in the conventional face milling method described above, a so-called wedge-on type mounting method in which the chip is mounted on the tool body using a wedge member for chip clamping can be adopted. In this method, the mounting position of the chip is relatively free. , The protrusion amount of the cutting blade can be easily adjusted.
However, in the above-mentioned vertical blade type face milling machine, the method of attaching the tip is inevitably limited to the screw-on type in which the clamp screw inserted into the tip body is screwed into the tool body to fix the tip. In the mounting method, the protruding amount of the cutting edge is uniquely determined by the forming accuracy of the tip and the chip mounting seat, so it is difficult to finely adjust the protruding amount of the cutting blade according to these forming accuracy errors. I was

The present invention has been made under such a background, and in particular, in the above-mentioned vertical blade type face milling machine,
It is an object of the present invention to provide a face mill capable of finely adjusting the amount of protrusion of a cutting edge of each tip toward a tool tip, and to provide a tip suitable for use in such a face mill.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve such an object, a face mill according to the present invention is formed on an outer peripheral portion of a tip end of a disk-shaped tool body rotated around an axis. In the tip mounting seat, a flat-shaped tip is directed to the tool tip side with one square surface as a flank, and one of the peripheral surfaces arranged around this one square surface is In the face mill, which is detachably mounted with the cutting blade formed at the intersection of the rake face and the flank facing the tool rotation direction side as the rake face and protruding toward the tool tip side. On the rear side in the tool rotation direction of the seat, there is provided adjusting means for abutting against the peripheral surface of the tip facing the tool rotation direction rear side to press the peripheral surface and finely adjusting the position of the chip in the contact direction. It is characterized by the following. Therefore, according to such a face mill, even if the tip is mounted on the tip mounting seat in a screw-on manner, the peripheral surface of the tip on the rear side in the tool rotation direction is pressed by the adjusting means, so that the clamp screw is pressed. Causes a slight elastic deformation of the tip, causing the tip to slightly move in the contact direction, whereby the cutting edge also slightly moves to the tool rotation direction and the tool tip side, and the protrusion amount is adjusted.

Here, the adjusting means includes a wedge member which abuts on the peripheral surface of the tip facing rearward in the tool rotation direction, and an adjusting screw which advances and retreats the wedge member in a direction oblique to the abutting direction. It is desirable to employ one having That is, by adopting such a configuration,
By rotating the adjusting screw, the wedge member advances and retreats according to the screw pitch, and further, according to the amount of advance and retreat and the inclination angle of the wedge member in the advancing and retreating direction with respect to the abutting direction, the chip is minutely moved in the abutting direction. Since it moves, precise fine adjustment is possible by appropriately setting these screw pitches and inclination angles, and the protrusion amounts of the respective chips can be accurately and easily matched.

On the other hand, the tip of the present invention is suitable for use as a face milling tip as described above,
With at least one rectangular surface of the flat chip body as a flank, at least one peripheral surface among the peripheral surfaces arranged around the one rectangular surface is a rake surface, and these rake surfaces and flank surfaces. On the intersection ridge line portion, while forming a cutting edge having a large convex curve shape with a large radius of curvature when viewed from the square surface side,
On the other peripheral surface opposite to the one peripheral surface, a thickness direction of the chip main body (hereinafter, referred to as a chip thickness direction).
And a flat surface parallel to. Therefore, when such a tip is mounted on the front milling cutter having the above-described configuration, the flank is provided with a clearance angle, so that the cutting edge is convex toward the tool tip side when viewed from the tool rotation direction side. While it is possible to improve the accuracy of the finished surface by forming a large convex curve having a large radius of curvature, the other peripheral surface opposite to the one peripheral surface on which the cutting edge is formed is formed. Since the formed flat surface parallel to the chip thickness direction is arranged and pressed perpendicular to the contact direction by the adjusting means, the protrusion amount of the cutting blade can be adjusted efficiently. In addition, the chip can be reliably supported.

[0008]

1 to 5 show one embodiment of a face milling machine according to the present invention. In this embodiment, the tool main body 1 has a substantially disk-shaped outer shape, and a large-diameter through hole 2 is formed at the center thereof.
Are formed around the periphery of the main body of the machine tool through these through holes 2 and the mounting holes 3.
Rotated. A large number of tip pockets 4 are formed at the tip outer peripheral portion of the tool main body 1 at regular intervals in the circumferential direction. A chip mounting seat 5 is formed on the rear side in the rotation direction T, and the chip 6 according to one embodiment of the present invention is detachably mounted on the chip mounting seat 5. An adjusting means 7 is provided on the rear side in the rotation direction T.

FIGS. 6 to 8 show a chip 6 of this embodiment.
As shown in FIG. 7, the chip body 8 is formed of a hard material such as cemented carbide into a rectangular flat plate shape, and is orthogonal to the chip thickness direction (vertical direction in FIGS. 7 and 8). A pair of rectangular surfaces 8A, 8A which are parallel to each other and have a rectangular shape, and two pairs of four peripheral surfaces 8B, 8B, 8C, 8C arranged around these rectangular surfaces 8A, 8A.
One of a pair of peripheral surfaces 8B, 8B connected to the long sides of the rectangular surfaces 8A, 8A is selectively used as a rake surface, and one of the rectangular surfaces 8A, 8A is selectively used as a rake surface. Flank surface, these square surfaces 8A, 8A and peripheral surface 8
Cutting edges 9 are formed on the intersection ridges with B, 8B, that is, on the four long sides in total of the square faces 8A, 8A.
In addition, a flat surface 10 parallel to the chip thickness direction is provided at the center of the peripheral surfaces 8B, 8B in the chip thickness direction.
Is formed so as to extend along the direction in which the long side of the rectangular surface 8A extends, and the peripheral surfaces 8B, 8B are formed along the chip thickness direction as shown in FIG.
As it goes from the side to the central portion side, it is inclined so as to be depressed toward the peripheral surfaces 8B opposite to each other at a fixed angle, and then cut up to be connected to the flat surface 10.

Further, the cutting edges 9 are formed so as to form a convex curve having a large radius of curvature as shown in FIG. 6 when viewed from the direction facing the rectangular surface 8A on which the respective cutting edges 9 are formed. Particularly, in the present embodiment, when viewed from a direction facing the square surface 8A along a portion where the peripheral surface 8B is depressed on the opposite peripheral surface 8B side, a convex arc shape having a large radius is formed. It is formed so as to form. Therefore, when viewed from the direction facing the rectangular surface 8A along the chip thickness direction, the cutting edge 9 has a convex elliptical shape having a large radius of curvature flattened in the short side direction of the rectangular surface 8A. . The radius of curvature R of the convex curve formed by the cutting edge 9 when viewed from the direction facing the rectangular surface 8A is about 30 to 200 mm, depending on the mounting posture of the chip 6 on the chip mounting seat 5. Is desirable. Further, at both ends of the cutting blade 9, there are formed corner blades 11, 11 each having a quarter arc shape as shown in FIG. 7 when viewed from a direction facing the peripheral surface 8B. Further, the flat surface 10 has a tangential direction in contact with a convex curve formed by the cutting edge 9 at the midpoint of the cutting edge 9 when viewed from a direction facing the rectangular surface 8A along the chip thickness direction. It is formed so as to extend. Furthermore, in the chip body 8, mounting holes 1 are formed in the center portions of the rectangular surfaces 8A, 8A so as to penetrate the chip body 8 in the chip thickness direction.
2 are formed.

On the other hand, the tip mounting seat 5 on which such a tip 6 is mounted retreats one step toward the rear end side of the tool (upward in FIGS. 3 and 4) from the front end face of the tool body 1 to move the front end side of the tool. The bottom surface 5A, the wall surface 5B rising from the bottom surface 5A and facing the tool rotation direction T and the wall surface 5C facing the tool outer peripheral side are formed so as to communicate with the tip pocket 4. Here, the bottom surface 5A
Has a rectangular shape substantially the same shape and the same size as the rectangular surface 8A of the tip 6, and is arranged so that the long side direction thereof is along the radial direction of the tool body 1, and the tool is arranged as shown in FIG. It is formed so as to be inclined toward the rear end side of the tool as it goes toward the rear side in the rotation direction T. At the center of the bottom surface 5A, a screw hole 13 is formed perpendicular to the bottom surface 5A. The tip 6 has one square face 8A selected as the flank face directed toward the tool tip, and has the other one square face 8A as a seating face and is in close contact with the bottom face 8A, and is also selected as a rake face. One peripheral surface 8B is directed to the tool rotation direction T side, and the other peripheral surface 8B on the opposite side is directed to the wall surface 5B side, and in this state, one peripheral surface facing the tool inner peripheral side. 8C is brought into contact with the wall surface 5C, is seated on the chip mounting seat 5, and is fixed to the tool body 1 by screwing the clamp screw 14 inserted through the mounting hole 12 into the screw hole 13.

Accordingly, since the bottom surface 8A of the tip mounting seat 5 is inclined as described above, the one flank surface 8A of the tip 6 as shown in FIG. The tool is arranged so as to be inclined toward the rear end of the tool as it goes toward the rear side of T, whereby one rectangular surface 8A serving as the flank and one peripheral surface 8B serving as a rake face are provided. As shown in FIG. 4, the cutting edge 9 formed at the intersection ridge portion is projected toward the tool tip side, and has a clearance angle with the one rectangular surface 8A connected to the cutting blade 9 at the rear side in the tool rotation direction T. Will be given. In addition, as the one rectangular surface 8A of the chip 6 is inclined and thus arranged, the cutting edge 9 formed into a convex curve on the long side of the rectangular surface 8A is strictly a tool rotation. Direction T
When viewed from the side, a convex curve having a very large radius of curvature (especially, in the present embodiment, a convex elliptical shape flattened in the chip thickness direction) which becomes extremely slightly convex toward the tool tip side is formed. In addition, the inclination angle α formed by the one rectangular surface 8A, which is a flank when mounted on the chip mounting seat 5, that is, the clearance angle of the cutting blade 9, in other words, the bottom surface 5A of the chip mounting seat 5. It is desirable that the inclination angle formed is set to about 3 ° to 15 ° although it depends on cutting conditions and the like.

Further, the adjusting means 7 provided on the rear side of the tip mounting seat 5 in the tool rotation direction T is a recess formed in the tool main body 1 so as to open on the wall surface 5B of the tip mounting seat 5 in this embodiment. Wedge member 16 attached to 15
And an adjusting screw 17 that engages with the wedge member 16 to move the wedge member 16 forward and backward. Here, the recess 15 has a substantially circular cross section, and is formed so as to be inclined so as to be directed toward the tool rotation direction T from the front end face of the tool main body 1 toward the tool rear end side. The recess 15 is formed so as to be perpendicular to the center axis of a circle formed by the cross section, and has a larger inclination than the bottom surface 5A of the tip mounting seat 5 toward the rear side in the tool rotation direction T as shown in FIG. It is formed so as to be inclined at the corner toward the rear end side of the tool. In the bottom surface 15A, a screw hole 18 is formed perpendicularly to the bottom surface 15A at a position deviated rearward in the tool rotation direction T with respect to the center axis of the circle formed by the cross section of the concave portion 15.

On the other hand, the wedge member 16 has a substantially cylindrical shape whose outer shape can be inserted into the concave portion 15, and has an outer peripheral surface that is oblique to the central axis of the cylindrical surface formed by the outer peripheral surface. An extended flat wedge surface 16A is formed and is directed toward the tip mounting seat 5 side. The inner peripheral portion of the wedge member 16 is formed eccentric to the side parallel to the central axis of the cylindrical surface and opposite to the side on which the flat surface 16A is formed. A female screw portion 19 that is twisted in a direction opposite to the screw hole 18 is formed. In addition, the inclination angle β of the wedge surface 16A with respect to the center axis X of the female screw portion 19 is such that the bottom surface 5A of the tip mounting seat 5 that inclines toward the rear end of the tool toward the rear side in the tool rotation direction T.
Is equal to the difference between the inclination angles of the bottom surface 15A and the bottom surface 15A of the concave portion 15, and is set in the range of 3 ° to 20 ° in the present embodiment. Further, the adjusting screw 17 has male screw portions 17A and 17B which are twisted in opposite directions at both ends thereof. The male screw portion 17A is provided in the screw hole 18 in the bottom surface 15A of the concave portion 15 and the male screw portion 17A. 17B is screwed into the female screw portion 19 of the wedge member 16, respectively.

However, in the face mill of the present embodiment provided with such an adjusting means 7, the adjusting means 7
The wedge member 16 is advanced and retracted so as to sink into the concave portion 15 by rotating the adjustment screw 17 of the above, so that the wedge surface 16 </ b> A faces the tool rotation direction T rear side of the chip 6 mounted on the chip mounting seat 5. It contacts the flat surface 10 of the other peripheral surface 8B that faces. At this time, as described above, the inclination angle β of the wedge surface 16A with respect to the center axis X of the female screw portion 19 is made equal to the difference between the inclination angles of the bottom surface 5A of the chip mounting seat 5 and the bottom surface 15A of the concave portion 15, and X
And the bottom surface 15A of the recess 15 and the flat surface 10 and the bottom surface 5A of the chip mounting seat 5 are arranged perpendicular to each other, so that the wedge surface 16A is parallel to the flat surface 10 and abuts in close contact therewith. .

From this state, the adjusting screw 17 is further moved.
Is rotated to cause the wedge member 16 to sink into the tool rear end side, so that the flat surface 10 of the tip 6 is pressed by the wedge surface 16A in a direction in which both surfaces are in contact with each other. Is slightly elastically deformed, so that the tip 6 is slightly moved toward the abutting direction so as to be guided by the bottom surface 5A and the wall surface 5C of the tip mounting seat 5, and accordingly, the tool tip side of the tip 6 The cutting edge 9 projecting toward the tool is also slightly moved to the tool rotation direction T side and the tool tip side, and the amount of projection is finely adjusted. Therefore, according to the front milling cutter having the above-described configuration, the tip 6 comes into contact with the flat surface 10 of the peripheral surface 8B facing the rear side in the tool rotation direction T and presses the peripheral surface 8B. By providing the adjusting means 7 for finely adjusting the position of the tip 6, even if the vertical milling type face milling machine is used, the cutting blade 9 can be used.
Can be finely adjusted, and the cutting edges 9 of the plurality of chips 6 attached to the tool body 1 can be adjusted.
By finely adjusting the protruding amount of the cutting blades 9, it is possible to perform the high-precision plane cutting by making the cutting edge positions of the respective cutting blades 9 coincide.

Further, in the face milling machine according to the present embodiment, the adjusting means 7 is provided so that the flat surface 10B of the peripheral surface 8B of the chip 6 can be used.
A wedge member 16 that abuts against the wedge member 16;
An adjustment screw 17 is provided for moving the cutting blade 9 forward and backward in the direction oblique to the contact direction, that is, in the center axis X direction. The amount of advance and retreat of the wedge member 16, the inclination angle β of the wedge surface 16 A with respect to the center axis X, and the inclination formed by the one rectangular surface 8 A of the chip 6 which is a flank when mounted on the chip mounting seat 5. (The inclination angle formed by the bottom surface 5A of the chip mounting seat 5) α. Specifically, for example, the inclination angle α is set to 8 ° and the inclination angle β is set to 10
When the screw pitch is set so that the wedge member 16 sinks down by 1 mm by further setting the adjustment screw 17 by one rotation, the cutting edge 9 projects 0.024 mm toward the tool tip side. Therefore, according to the present embodiment, it is possible to finely adjust the amount of protrusion of the cutting blade 9 more precisely, whereby the cutting edge positions of the respective cutting blades 9... Can be achieved. In addition, in the present embodiment including the adjusting means 7, the fine adjustment of the amount of protrusion of the cutting blade 9 is easily performed by rotating the adjusting screw 17, so that the time and labor required for the adjusting work are also reduced. It is also possible to reduce the number of times, and to obtain an effect that efficient work can be achieved.

On the other hand, in the chip 6 of this embodiment, one rectangular surface 8A of the rectangular flat chip body 8 is a flank and one peripheral surface 8B is a rake surface. Is formed at the intersection ridge line portion with a cutting edge 9 having a convex curve shape having a large radius of curvature when viewed from the square surface 8A side, so that the clearance angle is given to the one square surface 8A. When the tip 6 is attached to the tip mounting seat 5, the cutting edge 9 exhibits a very large convex curve with a radius of curvature that becomes slightly slightly convex toward the tool tip as viewed from the tool rotation direction T side as described above. It will be. Therefore, according to the insert 6 of the present embodiment, it is possible to finish the cut surface of the workpiece more smoothly, and in particular, when used for the face mill having the above-described configuration, the position of the cutting edges of the cutting edges 9. Together with the coincidence, it is possible to obtain more excellent finished surface accuracy.

In addition to this, the chip 6 of the present embodiment
In this case, a flat surface 10 parallel to the chip thickness direction is arranged on another peripheral surface 8B opposite to the one rake surface 8B. The wedge surface 16A of the wedge member 16 of the adjusting means 7 comes into contact with the wedge member 16 in close contact with the wedge member 16, and the wedge member 16 further sinks toward the rear end side of the tool, so that the chip 6 maintains its close contact state. The flat surface 1 in the contact direction
It is pressed perpendicularly to 0 and moved slightly, and the amount of protrusion of the cutting blade 9 is finely adjusted. That is, according to the present embodiment, the tip 6 is pressed in the direction perpendicular to the flat surface 10 to be slightly moved and supported irrespective of the advance / retreat position of the wedge member 16, so that the pressing force by the adjusting means 7 is provided. In this way, the amount of protrusion of the cutting blade 9 can be adjusted efficiently, and the tip 6 can be supported more reliably. It is possible to prevent a situation in which an error occurs in the projected amount of the cutting blade 9.

Further, in the tip 6 of the present embodiment, the peripheral surface 8B, which is the rake face of the cutting blade 9, is moved toward the flat surface 10 at the center in the thickness direction of the chip, and the peripheral surface 8B on the opposite side. The cutting edge 9 is formed so as to be cut up after being inclined to the side, so that the rake angle of the cutting edge 9 can be set to be larger on the regular angle side, so that the cutting edge 9 can be given sharp sharpness, and the flat surface 10 can be provided. The wall surface connected to the chip acts as a chip breaker wall, and good chip processing can be achieved. In the present embodiment, the rectangular flat chip body 8 is used.
A total of four cutting edges 9 are formed at the intersection ridges of a pair of rectangular surfaces 8A, 8A and a pair of peripheral surfaces 8B, 8B forming a rectangular shape. Or the square surfaces 8A, 8A are turned upside down, and re-attached to the chip mounting seat 5, and these square surfaces 8A
A, 8A are selectively made flank surfaces and peripheral surfaces 8B, 8
By selectively setting B as a rake face, a total of four cutting edges 9 can be reused with one tip 6, which is economical. However, in this embodiment, the chip body 8 is formed in a rectangular plate shape as described above. However, for example, the chip body is formed in a square plate shape, and all four peripheral surfaces can be selectively used as a rake face. In this case, eight cutting edges can be formed on one chip, which is more economical.

[0021]

As described above, according to the face milling machine of the present invention, it is possible to finely adjust the protruding amount of the cutting edge even if the tip is mounted in a vertical blade manner. The accuracy of the finished surface can be improved by aligning the positions of the cutting edges. In particular, when the adjusting means is provided with a wedge member and an adjusting screw, it is possible to precisely and easily adjust the protruding amount of the cutting blade by rotating the adjusting screw, thereby enabling more precise adjustment. As a result, more excellent finished surface accuracy can be obtained. On the other hand, according to the insert of the present invention, by using such a face mill, the cutting edge exhibits a convex curve shape with a large radius of curvature that is convex toward the tool tip side, so that a smoother finished surface can be obtained. As well as
Since the adjusting means abuts on a flat surface formed on the peripheral surface and parallel to the chip thickness direction and the chip is minutely moved,
Efficient fine adjustment of the cutting blade can be performed, and the chip can be securely held even during cutting.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of a throw-away type face milling machine of the present invention.

FIG. 2 is a view of the indexable type front milling machine shown in FIG. 1 as viewed from a tool tip side.

3 is an enlarged view of the vicinity of a tip mounting seat 5 of the throw-away type front milling machine shown in FIG. 1 as viewed from the tool rotation direction T side.

FIG. 4 is an enlarged sectional view of the vicinity of a tip mounting seat 5 of the indexable type front milling machine shown in FIG.

FIG. 5 is a view in the direction of the arrow Y in FIG. 4;

FIG. 6 is a plan view of the indexable insert 6 according to the embodiment of the present invention.

FIG. 7 shows a case where the indexable insert 6 shown in FIG.
It is the side view seen from B side.

8 is a sectional view taken along the line ZZ in FIGS. 6 and 7. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tool main body 5 Chip mounting seat 5A Bottom surface of chip mounting seat 5 5B, 5C Wall surface of chip mounting seat 5 6 Throw away chip 7 Adjusting means 8 Chip main body 8A Square surface of chip main body 8 8B, 8C Peripheral surface of chip main body 8 9 Cutting edge 10 Flat surface 16 Wedge member 16A Wedge surface 17 Adjusting screw 19 Female screw portion of wedge member 16 O Axis line of tool body 1 Tool rotation direction X Center axis of female screw portion 19 α Square used as flank of throwaway tip 6 Face 8
The inclination angle β formed by A The inclination angle of the wedge surface 16A with respect to the central axis X

Claims (3)

[Claims] 1. A flat throw-away tip is mounted on a tip mounting seat formed on an outer peripheral portion of a tip end of a disk-shaped tool main body which is rotated around an axis, with one flat face as a flank face on the tool tip side. And one of the peripheral surfaces arranged around the one flat surface is directed to the tool rotation direction side as a rake surface, and formed at the intersection ridge portion of these rake surfaces and flank surfaces. In a throw-away type front milling cutter having a cutting blade protruding toward a tool tip side and being detachably mounted, a peripheral portion of the insert mounting seat facing rearward in a tool rotating direction of the indexable insert is located rearward in a tool rotating direction. A throwaway type face mill comprising an adjusting means for abutting against the surface and pressing the peripheral surface to finely adjust the position of the throwaway tip in the abutting direction. 2. The adjusting means includes a wedge member that abuts on a peripheral surface of the throw-away tip that faces rearward in the tool rotation direction, and an adjustment screw that advances and retreats the wedge member in a direction oblique to the abutting direction. The indexable face milling machine according to claim 1, characterized by comprising: 3. A chip body having a rectangular flat plate shape has at least one square surface as a flank surface, and at least one of the peripheral surfaces disposed around the one square surface has a rake surface. At the intersection of the rake face and the flank, a cutting edge having a convex curved shape with a large radius of curvature when viewed from the square face side is formed, while another cutting edge opposite to the one peripheral face is formed. A throw-away tip, wherein a flat surface parallel to a thickness direction of the tip body is formed on one peripheral surface of the tip body.