JPH0970709A - Bevel milling cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bevel milling cutter having high rigidity, capable of dealing with different beveling angles and also notch variation. SOLUTION: A spacer 6, having tilted thickness, is assembled between a cartridge 8 on which a throw away tip 10 is mounted and a fitting recessed part 5. The cartridge 8 and the spacer 6 are detachably assembled to be of dealing with the change of a bevel angle at any time by being changed with the spacer 6 into a spacer 6 having a tilted angle adaptable to the change of a bevel angle in accordance with the change of a bevel angle. Since the quadrangle platelike throw away chip 10 is stuckly mounted from a front side and an outer peripheral side so that a side surface 14 can become a flank surface, chip strength can be made high, and a notch in a milling cutter corner part can be made large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove milling cutter used for chamfering a side surface of a rolled steel sheet, and can change the angle according to the groove angle.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, in a conventional groove milling machine, a front surface of a tool main body 1 has a conical surface matching a groove angle, and a throw-away tip 1 is provided on the conical surface.
It is to wear 0. Throw-away tip 10
Is fixed directly to the tip seat provided on the front side of the tool body 1 by means of a countersunk screw 13 so that the side surface 14 of the tip becomes a rake face. Depending on the size of the chamfer, cutting edges are combined to create a chamfering cutting edge. Are arranged as follows. In this conventional example, two rows and six throw-away tips form one set to form a chamfer cutting edge. Chip pocket 1 in front of the throw-away tip 10 in the direction of rotation
5 are provided.

[0003]

However, in the conventional groove milling cutter as described above, each time the groove angle is different, a dedicated milling cutter having an angle corresponding to this is required, and a large number of milling cutters must be held. There was a problem that it had to be. Further, in the groove milling machine as described above, since the side surface of the chip is used as a rake face, there is a restriction on the length of the outer peripheral cutting edge in the frying corner portion, and there is a problem that a large cutting depth cannot be obtained.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a throw-away tip is conically arranged on the front side of a tool body having an annular shape. In a groove milling cutter configured to have an inclination suitable for chamfering the side surface of the tool, a mounting recess is provided on the front side of the tool body, and a spacer having an inclined thickness is removably incorporated in the mounting recess. A cartridge to which a throw-away tip is attached is detachably attached to the spacer.

Secondly, in the throw-away tip having a quadrangular flat plate shape, a countersunk hole penetrates through the flat plate and is attached to the tool body with a countersunk screw so that the side surface of the throw-away tip becomes a rake face. Is composed of.

Thirdly, the throw-away tip is arranged so that the transfer cutting edge becomes one continuous cutting edge, and the throw-away tip is mounted from the outer peripheral side. It is characterized in that at least one formed cartridge is incorporated.

[0007]

According to the present invention, the component for mounting the throw-away tip is a cartridge, and a spacer having an inclined thickness is interposed between the cartridge and the mounting recess of the tool body. Therefore, by changing to a spacer with a different inclination angle, the mounting angle of the cartridge changes,
The angle of the cutting edge also changes. That is, if only spacers are prepared, different groove angles can be dealt with at any time.

The throw-away tip has a rectangular flat plate shape. Therefore, the rake angle in the central direction and the rake angle in the axial direction are both set to be negative, and the tool body is mounted so as to be attached from the front side, so that the chip strength is also secured. In addition, since the amount of scraping off the tool body is small, the tool rigidity is maintained.

Further, since there is a throw-away tip attached so as to be attached also to the outer peripheral side, the outer peripheral cutting edge becomes long, and a large cut can be made in the frying corner.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2, on the front side of the tool body 1, a center hole 2 for fitting with a centering plug mounted on the spindle end of a machine tool, a bolt hole 3 for fixing to the spindle end, etc. The keyways 4 for driving the rotation are provided on the back surface.

Further, a mounting recess 5 is cut out from the front side of the tool body 1. The bottom surface of the mounting recess 5 is formed parallel to the back surface of the tool body 1. First, the spacer 6 is incorporated into the mounting recess 5. The spacer 6 has a plate shape that is inclined so as to have different thicknesses, and is incorporated so that the thickness changes in the diameter direction of the milling cutter. Bolt holes are bored in the spacer 6, and the tool body 1
It is tightened and fixed to. At this time, the head portion of the tightening bolt 7 is embedded and attached so as not to project from the spacer 6.

A cartridge 8 is attached to the spacer 6. The mounting method is the same as that described above, and the cartridge 6 is tightened and fixed to the spacer 6 by the tightening bolts 9 through the bolt holes formed in the cartridge 8. The cartridge 8 is
Since the top surface and the bottom surface are formed so as to be parallel to each other, the inclination angle of the spacer 6 becomes the attachment inclination angle of the cartridge 6 as it is.

The cartridge 8 has a structure shown in FIGS.
A square flat throwaway tip 10 as shown in FIG.
Is attached. Flat surface 11 of the throw-away tip 10
A countersunk hole 12 penetrates through the center, and is tightened and fixed in the tip seat provided in the cartridge 8 by a countersunk screw 13. Since the throw-away tip 10 is a negative type, both the axial rake angle and the central rake angle are set to be negative in order to secure a clearance angle. Therefore, the flat plate surface 11 is the front flank and the side surface 14 of the throw-away tip 10 is the rake surface.

Two adjacent types of cartridges 8 form one set, and the cartridges 8 are assembled alternately. The two kinds of cartridges 8 are arranged with three throw-away chips 10 on the front side, respectively, at intervals, and at the same time, they are arranged so as to complement each other's gaps, so that when they are rotated, one continuous cut is formed. It is designed to be transferred as a blade. Further, in order to cope with a change in cutting depth, one of the two types of cartridges 8 is mounted so that the throw-away tip 10 can be attached from the outer peripheral side of the cutter body 1.

The front of the throw-away tip 10 in the rotational direction is provided with a gap so that the cartridge 8 is at a low position, and the tool body 1 is also provided with a recess to form a chip discharging pocket 15.

[0016]

As described above, according to the present invention, it becomes possible to cope with different groove angles by exchanging only the spacer,
It becomes possible to reduce the number of owned bevel mills. Further, since the rigidity of the insert and the tool body is maintained and the outer peripheral cutting edge is long, stable cutting can be performed even when the cutting depth changes.

[Brief description of drawings]

FIG. 1 is a front view of a groove milling cutter showing an embodiment of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a front view of a throw-away tip showing an embodiment of the present invention.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a front view showing an example of a conventional bevel mill.

FIG. 6 is a side view of FIG. 5;

[Explanation of symbols]

 1 Tool Body 6 Spacer 7 Tightening Bolt 8 Cartridge 9 Tightening Bolt 10 Throwaway Tip 13 Plate Screw

Claims (3)

[Claims] 1. The front side of the tool body 1 having an annular shape,
In a groove milling cutter in which the throw-away tip 10 is arranged in a conical shape and has an inclination suitable for chamfering the side surface of a rolled steel plate, a mounting recess 5 is provided on the front side of the tool body 1. A groove milling cutter in which a spacer 6 having an inclined thickness is removably incorporated in the mounting recess 5, and a cartridge 8 to which a throw-away tip 10 is mounted is removably mounted in the spacer 6. 2. A throwaway tip 10 having a quadrangular flat plate shape has a countersunk hole 12 penetrating through a flat plate surface 11 and is attached to a tool body 1 with a countersunk screw 13, and a side surface 14 of the throwaway tip 10 is attached. The groove milling cutter according to claim 1, which is configured to have a rake face. 3. The throw-away tip 10 comprises a cartridge 8 so that the transfer cutting edge becomes one continuous cutting edge.
3. At least one cartridge 8 which is disposed on the front side of the cartridge and is formed so that the throw-away tip 10 can be mounted from the outer peripheral side is incorporated therein. Bevel mill.