JP2516244Y2 - Hole cutting tool - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole cutting tool for finishing the inner peripheral surface of a hole made by a drill or the like.

[0002]

2. Description of the Related Art Conventionally , a hole cutting tool 1 is shown in FIGS.
As shown by 3, it has a shank 2 which is formed in a cylindrical shape by carbon tool steel and other steel, the right end of the shank 2 is provided by decentering the <br/> diameter of the head 3. Its head 3
The outer periphery of the eccentric side projecting from the shank 2 to the side, substantially
The upper rake face 4a extending horizontally and standing from one side
Extending axially and pocket 4 which is notched into an L-shaped cross section were formed in the raised vertical wall Prefecture. The right end portion of the pocket 4 is His missing cut into <br/> stepped chip 5 of cemented carbide in the notches
That it has been mounted by brazing. Further, the axial center of the shank 2 forming the oil holes 6, the right end of the oil hole 6 is opened to the left end surface 4b of the <br/> pocket 4, the left end of the cooling oil supplied to the oil hole 6 Discharge from the surface 4b toward the cutting edge 5
Tei Ru.

[0003]

[Problem to be solved by the invention]
Since the pocket 4 is notched in an L-shaped cross section over the entire length of the head 3, there is a drawback that the strength of the base portion of the head is reduced. Further, since the left end surface 4b of the pocket 4 is orthogonal to the axis of the head 3, there is a drawback that the chips cut by the cutting blade 5 collide with the left end surface 4b and stay in the pocket 4. An object of the present invention is to obtain a new cutting tool for drilling holes that solves the above drawbacks.

[0004]

In order to solve the above problems, the present invention provides a head having a large diameter at the tip of a rod-shaped shank, and includes a horizontal upper rake surface and a vertical standing wall surface.
A pocket having an L-shaped cross section as viewed from the shank in the head direction is formed on the outer periphery of the head, a throwaway tip is provided at the tip of the upper rake face, and the standing wall surface is provided near the base of the shank. Once of the head
It is formed in a substantially S-shape that is inclined in the outer peripheral direction and is then reduced in inclination. Further, specifically, on the upper rake face forming the pocket having the L-shaped cross section, a second pocket is formed in the vicinity of the base of the shank by recessing downward in the vicinity of the circumferential end.

[0005]

[Action]Chips cut with a throwaway tip
Flows toward the shank in the pocket. Chips are standing walls
When guided by the surface and flowing in the shank direction, gradually
It is pushed outwards and removed from the pocket. That
At this time, since the chips are elongated,
Even if you encounter a steep slope, it will deform relatively easily, and
Following this, it is rapidly discharged to the outside of the pocket. Also, Poke
If a second pocket is provided inside the hood, it is close to the head shank.
There is a large guidance space beside it, so it's a throwaway tip.
The chips that flow from there are removed outside through it.
You.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing a first embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a right side view of FIG. 1, and FIG.
1 is a sectional view taken along the line IV-IV of FIG. 1, FIG. 5 is a front view of a main portion of a second embodiment of the present invention, FIG. 6 is a side view thereof, and FIG. 7 is a VII-V of FIG.
II sectional view, FIG. 8 is a front view of essential parts showing a third embodiment of the present invention, FIG. 9 is a side view thereof, and FIG. 10 is a sectional view taken along line XX of FIG.

In FIGS. 1 to 4, reference numeral 10 denotes a hole machining tool, which has a large-diameter head 12 integrally formed on the right end (tip) of a cylindrical shank 11. The shank 11 and the head 12 are made of ferro titanium (trade name) or die steel (SKD12). The head 12 is eccentric to one side with respect to the shank 11, and the right end portion (tip portion) is deep and the left end portion (base portion) is shallow in the outer peripheral portion of the eccentric side projecting laterally from the shank 11, and is L-shaped
Form a notched pocket 13 (as viewed from shank 11 toward head 12) .

The surface of the pocket 13 in the eccentric direction, that is,
The right end of one surface (upper rake surface) 13a is cut out stepwise to form a tip seat 14, and a tip (throwaway tip) 15 made of a super hard material formed in a diamond shape in plan view is formed on the tip seat 14. It is placed and clamped and fixed by the clamp screw 16. As shown in FIG. 2, the upper rake face 13a has an angle of about 5 degrees so that the right end is located on the axis L of the shank 11 and the left end is located slightly below (outer peripheral side) the axis L. It is tilted. Also, pocket 13
As shown in FIG. 1, the other surface (upper wall surface) 13b of the right end is slightly above the axis L of the shank 11 (outer periphery).
Gradually one side outer circumferential end 13a-1 of the (upper rake face) 13a, knob according to position, going from the right end to the left in
The head 3 is inclined in an S shape so as to approach the outer peripheral direction .

A main oil hole 17 is formed in the shaft center of the shank 11, and a discharge oil hole 18 communicating with the main oil hole 17 is formed in the left part of the head 12. The discharge oil hole 18 has its discharge port 18a opened in the middle portion in the left-right direction of the other surface (standing wall surface) 13b of the pocket 13 and faces the cutting edge 15a of the chip 15. As shown in FIG. 4, the left end portion of the shank 11 is formed with a flat portion 11a on its lower surface and both left and right sides, and the flat portion 11a is tightened with a fastening bolt of a bite holder (not shown) so that the shank 11 can be tightened. Prevents ready rotation.

FIGS. 5 to 7 show a second embodiment, in which the second pocket 20 is formed by notching the left side of one surface (upper rake surface) 13a of the pocket 13 to form the second pocket 20. Different from the first embodiment. In the second pocket 20, the one surface (upper rake surface) 13a is inclined from the right part to the left part in the opposite direction to the outer peripheral end 13b-1 of the other surface (upper wall surface) 13b of the pocket 13. , Its left end 20a is opened to the outer periphery of the right end of the shank 11.

8 to 10 show a third embodiment, in which the second pocket 20 is formed by notching the left side of one surface (upper rake surface) and the other surface (upper wall surface) 13b of the pocket 13. 'Is different from the first embodiment described above. The second pocket 20 'has one surface (upper rake surface) described above.
The other surface of the pocket 13 toward the right or left of 13a
(Standing wall surface) 13b is inclined in the opposite direction to the outer peripheral end 13b-1 and the other surface (standing wall surface) 1 of the pocket 13
The bottom of the left side of 3b is notched, and the left end 20a 'is opened to the outer periphery of the right end of the shank 11.

The operation and effect of the above embodiment will be described. First, fasten the hole cutting tool 10 to the tool holder,
Then, the workpiece (not shown) or the cutting tool 10 is rotated in a predetermined direction, and the inner peripheral surface of the hole of the workpiece is cut by the cutting edge 15a of the chip 15. The chips generated during this cutting are the other surface (standing wall surface) 13b of the pocket 13.
While being moved to the left while being guided to the outer peripheral direction, it is discharged from the left end of the pocket 13 toward the outer peripheral portion of the shank 11. In this case, in the second and third embodiments, the left portion of the pocket 13 is the second pocket 20 (2
0 ') is expanded in the circumferential direction, and a shallow and wide circumferential space is formed at the left end of the head 12 by the pocket 13 and the left end of the second pocket 20 (20'). Thus, the above chips are smoothly discharged toward the outer peripheral portion of the shank 11.

[0013]

As described above, according to the present invention, the pocket formed on the head of the shank is inclined in an S-shape from the axial center side to the outer peripheral side along the vertical wall from the tip to the base.
Since the area of the upper rake face is reduced,
The cross-sectional area is large and the bending strength is large. Ma
Also, chips are standing walls that form pockets near the cutting tool.
The surface smoothly guides in the shank direction, and
No cutting resistance is generated. In addition, the chips are
The second pocket provides a wider space near the
It is then discharged to the outside, so it is excellent in removing chips and cutting
It has the effect of improving the sex.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a right side view of FIG. 1;

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a front view of a main part showing a second embodiment of the present invention.

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

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a front view of a main portion showing a third embodiment of the present invention.

9 is a side view of FIG.

10 is a sectional view taken along line XX of FIG.

FIG. 11 is a front view showing a conventional example.

FIG. 12 is a side view of FIG. 11.

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols]

10 Bit for Processing Hole 11 Shank 11a Flat Part 12 Head 13 Pocket 13a One Surface (Upper Rake Surface) 13b Other Surface ( Upright Wall Surface) 14 Tip Seat 15 Chip 15a Cutting Edge 16 Clamp Screw 17 Main Oil Hole 18 Discharge Oil Hole 18a Discharge port 20 Second pocket 20 'Second pocket L Shank axis

Claims (2)

(57) [Scope of utility model registration request] 1. A large-diameter head is provided at the tip of a rod-shaped shank, and is composed of a horizontal upper rake surface and a vertical standing wall surface.
A pocket having an L-shaped cross section as viewed from the shank in the head direction is formed on the outer periphery of the head, a throwaway tip is provided at the tip of the upper rake face, and the standing wall surface is provided near the base of the shank. Once of the head
A hole machining bit formed by inclining in the outer peripheral direction and then forming a substantially S-shape that reduces the inclination. 2. The pocket having an L-shaped cross section according to claim 1.
On the upper rake face that forms the hood, near the base of the shank.
In addition, the vicinity of the end in the circumferential direction is depressed downward to form the second pocket.
A hole cutting tool formed by forming .