JPH08290316A - Throwaway ball end mill - Google Patents

Abstract

PURPOSE: To reduce the manufacturing cost of throwaway tips, facilitate the control and the like of the throwaway tips and allow correct cutting to be performed stably without the free dislocation of each throwaway tip in a throwaway ball end mill using two throwaway tips. CONSTITUTION: The round tip part of a shank 10 is provided with a main tip fitting part 11 and an auxiliary tip fitting part, and a throwaway tip 20 with a main cutting edge 21 and a throwaway tip 20 with an auxiliary cutting edge 22 are fitted to the main tip fitting part 11 and the auxiliary tip fitting part to form a throwaway ball end mill. Accordingly, the throwaway tips 20 are respectively provided with the main cutting edge 21 and the auxiliary cutting edge 22.

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 ball end mill in which a throw-away tip having a cutting edge is attached to a tip mounting portion at a rounded tip portion of a shank, and in particular, the shank is rounded. A main chip mounting part and a sub chip mounting part are provided at the tip end,
The present invention relates to a throw-away type ball end mill in which a throw-away tip having a main cutting edge is attached to the main tip attaching section and a throw-away tip having a sub cutting edge is attached to the sub-tip attaching section.

[0002]

2. Description of the Related Art Conventionally, as one of cutting tools, a throw away type ball end mill has been used in which a throw away tip having a cutting edge is attached to a tip attaching portion at a rounded tip of a shank. As a throw-away type ball end mill, one tip attachment part is provided on the rounded tip of the shank, and one throw-away tip is attached to this tip attachment part, as well as the rounded tip of the shank. A main chip mounting portion and a sub-chip mounting portion are provided, a throw-away tip having a main cutting edge is mounted on the main chip mounting portion, and a throw-away tip having a sub-cutting edge is mounted on the sub chip mounting portion. It was known that one throw-away tip was attached to the tip of the shank.

Further, as described above, in the throw-away type ball end mill in which the two throw-away tips, the throw-away tip having the main cutting edge and the throw-away tip having the auxiliary cutting edge, are attached to the tip of the shank, the main cutting is performed. In order to effectively utilize the throw-away tip having the blade and the throw-away tip having the auxiliary cutting edge, as shown in FIGS. 1A and 1B, the main cutting edge 2a
In the throw-away tip 2 having, the two main cutting edges 2a and the throw-away tip 3 having the sub cutting edge 3a are provided.
Also in this case, two sub cutting edges 3a are provided.

In the throw-away type ball end mill using the throw-away tips 2 and 3 as described above, the main cutting edge 2a is attached to the main tip mounting portion 1a at the tip of the shank 1, as shown in FIG. The throw-away tip 2 is attached with screws 4 so that the main cutting edge 2a thereof projects toward the tip side, and the sub-tip attachment portion 1
The throw-away tip 3 having the sub cutting edge 3a is attached to b so that the sub cutting edge 3a projects to the outer peripheral side, and is pressed against the object to be cut while rotating this throw away type ball end mill, Blade 2a and sub cutting edge 3
The object to be cut is cut by a. By this cutting, the main cutting edge 2 of the throw-away tips 2 and 3 is cut.
In the case where a and the sub cutting edge 3a are worn, the throw-away tips 2 and 3 in which the main cutting edge 2a and the sub cutting edge 3a are worn are respectively rotated by 180 degrees to reach the main tip mounting portion 1a and the sub tip mounting portion 1b. Attaching the other main cutting edge 2a or sub cutting edge 3a provided on these throw-away tips 2 and 3
Was used to perform cutting again.

However, in such a throw-away type ball end mill, there are two kinds of throw-away tips 2 having two main cutting edges 2a and two throw-away tips 3 having two auxiliary cutting edges 3a. The throw-away chips 2 and 3 must be manufactured separately and must be prepared separately, resulting in a high manufacturing cost and troublesome management of the throw-away chips 2 and 3.

Further, in the above throw-away type ball end mill, the edge portion of the throw-away tip 2 provided with two main cutting edges 2a is arcuate as shown in FIG. Because of the shape, even if the throw-away tip 2 is attached to the main tip attaching portion 1a with the screw 4 as described above, the throw-away tip 2 is rotated while the throw-away type ball end mill is rotated as described above. When the workpiece is cut by pressing against the object to be cut, a pressing force and a rotational force are applied to the throw-away tip 2, the throw-away tip 2 is slightly displaced in the main tip mounting portion 1a, and accurate cutting is performed. There was a problem that could not be done.

[0007]

SUMMARY OF THE INVENTION According to the present invention, two throw-away tips, a throw-away tip having a main cutting edge and a throw-away tip having a secondary cutting edge, are attached to a main tip at a rounded tip of a shank. It is an object of the present invention to solve the above-mentioned problems in a throw-away type ball end mill which is attached to a portion and a sub-tip attachment portion to perform cutting.

That is, according to the present invention, in the throw-away type ball end mill using the two throw-away tips as described above, two kinds of throw-away tips are separately manufactured and prepared as in the conventional case. There is no need to do so, the manufacturing cost of each throw-away tip becomes cheaper, and the management of each throw-away tip can be done easily.Furthermore, each throw-away tip can be used as the main tip attachment part and the sub-tip attachment part of the shank. Even when it is mounted on a machine and cut, each throw-away tip does not shift by itself, and it is an object to enable stable and accurate cutting.

[0009]

According to the present invention, in order to solve the above problems, the main chip mounting portion 11 and the sub chip mounting portion 12 are provided at the rounded tip of the shank 10.
And a throw-away tip 20 having a main cutting edge 21 attached to the main tip mounting portion 11 and a throw-away tip 20 having a sub cutting edge 22 attached to the sub-tip mounting portion 12. In the conventional ball end mill, each of the above throw-away tips 20 is provided with a main cutting edge 21 and a sub cutting edge 22, respectively.

Further, in the throw-away type ball end mill according to the present invention, as described above, the main cutting edge 21 is used.
A throw-away tip 20 provided with a sub cutting edge 22
Linear contact parts 23 and 24 are formed at the edges of the above, and the main chip attachment part 11 and the sub chip attachment part 12 at the tip of the shank 10 correspond to the above-mentioned contact parts 23 and 24, respectively. The stoppers 13 and 14 are provided.

[0011]

In the throw away type ball end mill according to the present invention, the main cutting edge 21 and the sub cutting edge 21 are respectively attached to the throw away tips 20 attached to the main tip mounting portion 11 and the sub tip mounting portion 12 at the rounded tip of the shank 10. Since the cutting edge 22 is provided, the same throw-away tip 20 can be used only by changing the attachment state of the throw-away tip 20 to the main tip mounting portion 11 and the sub-tip mounting portion 12. Thus, it is not necessary to manufacture and prepare two types of throw-away chips.

Further, as described above, the main cutting edge 21 and the sub cutting edge 2
2 is formed on the edge of the throw-away tip 20 provided with 2 and linearly shaped contact portions 23 and 24, and the main chip attachment portion 11 and the sub-tip attachment portion 12 at the tip end of the shank 10 are respectively described above. The contact stop portions 13 and 14 corresponding to the contact portions 23 and 24 are provided, and each throw-away tip 20 is attached to the main chip attachment portion 11 and the sub chip attachment portion 12.
When the contact parts 23 and 24 of the throw-away tip 20 are brought into contact with the contact stop parts 13 and 14 provided on the main chip mounting part 11 and the sub chip mounting part 12, respectively, the throw-away chips are attached to the throw-away chip 20. Chip 20
Is restricted by the contact stoppers 13 and 14 described above, and even if a pressing force or a rotational force is applied to each throw-away tip 20 at the time of cutting, each throw-away tip 20 causes the main tip attachment portion 11 or the sub-tip attachment portion to move. It is possible to suppress the shift within 12 without permission.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A throw-away type ball end mill according to embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

Also in the throw-away type ball end mill in this embodiment, as shown in FIGS. 3 and 4,
The main tip mounting part 11 is attached to the rounded tip of the shank 10.
And the sub-chip mounting portion 12 are provided, and the throw-away tip 20 having the main cutting edge 21 is mounted to the main chip mounting portion 11 with the screw 4, and the sub-chip mounting portion 1 is also provided.
The throw-away tip 20 having the sub cutting edge 22 is attached to the screw 2 with screws 4.

Here, in this embodiment, the same throw-away chips 20 are attached to the main chip mounting portion 11 and the sub chip mounting portion 12 as described above. Then, in the throw-away tip 20, as shown in FIG. 5, a main cutting edge 21 and a sub-cutting edge 22 are provided on the edge portion thereof, and the edge portion adjacent to the main cutting edge 21 has a linear shape. While providing the contact portion 23, the auxiliary cutting edge 22
Also, a linear pad portion 24 is provided on the edge portion adjacent to
Further, screws 4 are provided in the center of the throw-away tip 20.
Through the above-mentioned main chip mounting portion 11 and sub-chip mounting portion 1
A mounting hole 25 to be attached to 2 and 2 is provided.

On the other hand, the main chip mounting portion 1 at the tip of the shank 10 to which the above throw-away chip 20 is mounted.
1 is provided with an abutting stop portion 13 against which the abutment portion 24 at the edge portion adjacent to the sub cutting edge 22 abuts, while the sub chip attachment portion 12 is provided with an abutment portion 2 at the edge portion adjacent to the main cutting edge 22.
The contact stopper 14 with which 3 contacts is provided.

Then, the above throw-away tip 20.
When attaching the main cutting edge 21 to the main tip mounting portion 11 of the shank 10, as shown in FIG. 3, the main cutting edge 21 of the throw-away tip 20 is projected from the tip of the shank 10, and the sub cutting edge 22 is attached to the shank 10 of the shank 10. The contact portion 24 provided adjacent to the auxiliary cutting edge 22 is brought into contact with the contact stopper portion 13 provided on the main chip mounting portion 11 toward the core side, and in this state, the screw 4 Thus, the throw-away tip 20 is attached to the main tip attachment portion 11.

On the other hand, when the throw-away tip 20 is attached to the sub-tip attaching portion 12 of the shank 10, the main cutting edge 21 of the throw-away tip 20 is directed toward the rear side of the shank 10, as shown in FIG. , The auxiliary cutting edge 22 is provided at the tip of the shank 10 so as to project to the outer peripheral side of the shank 10.
The throw-away tip 20 is attached to the sub-tip attachment portion 12 by means of the screw 4 in the state of being brought into contact with the above-mentioned contact stopper portion 14 provided in FIG.

Further, in the throw-away type ball end mill in this embodiment, the throw-away tip 3 for peripheral cutting which has a rhombus shape to the rear side of the shank 10 from the main tip mounting portion 11 and the sub-tip mounting portion 12 described above.
Although 0 is attached by screws 4 at appropriate intervals, it is not always necessary to provide such a throw-away tip 30 for peripheral cutting.

When cutting the work piece by the throw-away type ball end mill in this embodiment, the throw-away type ball end mill is pressed against the work piece while rotating, and is attached to the main chip mounting portion 11 at the tip of the shank 10. The object to be cut is cut by the main cutting edge 21 of the attached throw-away tip 20, and the sub-cutting edge 22 of the throw-away tip 20 attached to the sub-tip attachment portion 12 and the throw-away tip 30 for peripheral cutting described above. The periphery of the object cut by the main cutting edge 21 is further cut by.

Here, in the throw-away type ball end mill according to this embodiment, when the throw-away tip 20 is attached to each of the main tip mounting portion 11 and the sub-tip mounting portion 12 at the tip of the shank 10, each throw is performed as described above. The linear contact portions 24 and 23 of the away tip 20 are respectively attached to the main tip mounting portion 11
And each stopper 13 provided on the sub-chip mounting portion 12,
Since each of the throw-away tips 20 is brought into contact with the main tip mounting portion 11 even when the throw-away type ball end mill is pressed against the object to be cut while rotating the throw-away type ball end mill as described above. It is regulated by the contact stoppers 13 and 14 provided on the sub-chip mounting part 12 and the throw-away chips 20 in the main chip mounting part 11 and the sub-chip mounting part 12 are not displaced and stable and accurate. I was able to do various cutting.

[0022]

As described above in detail, in the throw-away type ball end mill according to the present invention, the main cutting edge is attached to each of the throw-away tips attached to the main tip mounting portion and the sub-tip mounting portion at the rounded tip of the shank. And the auxiliary cutting edge are provided, and the attachment state is changed so that the same throw-away tip is attached to the main tip attaching section and the sub-tip attaching section. Therefore, two types of throw-away tips are manufactured as in the past. It is not necessary to prepare it, the manufacturing cost of the throw-away tip is low, and it is now possible to manage it easily.

Further, in the throw-away type ball end mill according to the present invention, when the above-mentioned throw-away tip is attached to the main tip mounting portion and the sub-tip mounting portion of the shank, the throw-away tip has a linear shape at the edge portion thereof. While forming the contact part, the main chip mounting part and the sub chip mounting part of the shank are provided with contact stoppers corresponding to the above contact parts, and the contact part of each throw-away tip is mounted to the main chip mounting part and the sub chip mounting part. Since it is made to abut against the contact stop part in the part, there is no chance that each indexable insert will be pushed during cutting and will not be displaced by itself in the main chip attachment part and sub chip attachment part, and stable cutting can be performed. became.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a state of a throw-away tip having a main cutting edge and a throw-away tip having a sub cutting edge, which are used in a conventional throw-away type ball end mill.

FIG. 2 is a schematic view of a conventional throw-away type ball end mill.

FIG. 3 is a schematic view showing a state in which the throw-away tip is attached to the main tip attachment portion at the tip of the shank in the throw-away type ball end mill according to the embodiment of the present invention.

FIG. 4 is a schematic view showing a state in which the throw-away tip is attached to the sub-tip attachment portion at the tip of the shank in the throw-away type ball end mill of the embodiment.

FIG. 5 is a plan view of a throw-away tip used in the throw-away type ball end mill of the embodiment.

[Explanation of symbols]

 10 Shank 11 Main Tip Attachment Part 12 Sub Tip Attachment Section 13, 14 Abutment Stop Section 20 Throwaway Tip 21 Main Cutting Edge 22 Sub Cutting Edge 23, 24 Abutment Section

Claims (2)

[Claims] 1. A shank 10 is provided with a main tip attachment portion 11 and a sub-tip attachment portion 12 at a rounded tip portion, and a throw-away tip 20 having a main cutting edge 21 is attached to the main tip attachment portion 11. In addition, the throw-away tip 20 having the sub-cutting edge 22 on the sub-tip mounting portion 12
A throw-away type ball end mill in which a main cutting edge 21 and a sub-cutting edge 22 are provided on each of the above throw-away tips 20. 2. The throw-away type ball end mill according to claim 1, wherein the abutting portions 23, 24 are linear on the edge of the throw-away tip 20 provided with a main cutting edge 21 and a sub cutting edge 22. Is formed, and the main chip mounting portion 11 and the sub-chip mounting portion 12 at the tip of the shank 10 are provided with contact stoppers 13 and 14 corresponding to the contact portions 23 and 24, respectively. Throw-away type ball end mill.