JP2003340626A - Cutting tool with oil hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool with oil holes which can improve cutting efficiency because oil easily spreads over not only both flanks 3 but also both principal flutes 4 during cutting a workpiece, because the oil flows out from apertures 11 on both of the flanks 3 and apertures 12 on both of the principal flutes 4, respectively. <P>SOLUTION: The two flanks 3 having predetermined point angles and the two principal flutes 4 opened neighboring the two flanks 3 for discharging chips are arranged outside a chisel 2 formed at the tip of the drill body on a rotational axis 1a in the rotational direction X of a drill body. Cutting edges 6 are formed at one end edge 5a side of both end edges 5a, 5b located at both sides of the two flanks 3 in the rotational direction X. Apertures 11 of oil holes 9 are formed on both faces 3. In addition, apertures 12 of the oil holes 9 are formed next to both flanks 3 on both principal flutes 4. The apertures 11 on both flanks 3 and the apertures 12 on both principal flutes 4 are connected with each other by apertures 13 passing the end edges 5b of both end edges 5a, 5b of both flanks 3, and are closely arranged. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool with an oil hole such as a drill with an oil hole or a reamer with an oil hole.

[0002]

2. Description of the Related Art In the drill with an oil hole shown in FIGS. 1 (c) and 4, among the two flanks 3 and the two main grooves 4 for discharging chips, which are alternately arranged on the outer periphery of the chisel 2. An open portion 9a of the oil hole 9 is formed only on both flanks 3.

[0003]

However, in the conventional drill with an oil hole, the oil flowing out from the open portion 9a of the oil hole 9 at both flanks 3 at the time of cutting the work is the work and the both flanks 3
Due to the outflow resistance generated in the small gap between and, it is difficult to spread from both flanks 3 to both main grooves 4, thus causing a reduction in cutting efficiency.

An object of the present invention is to improve the cutting efficiency by improving the opening of the oil hole.

[0005]

Means for Solving the Problems and Effects of the Invention FIG. 1 is a plan view of an embodiment (a first embodiment shown in FIGS. 1A and 2;
The present invention will be described with reference to the reference numerals of the second embodiment shown in FIGS. 1B and 3.

* Inventions of Claims 1 to 3 The cutting tool with oil holes according to the invention of Claim 1 is configured as follows. This oil hole cutting tool (for example,
In the case of a drill with an oil hole or a reamer with an oil hole, the center of rotation of the tool body (1) (1
a cutting end face (3) having a cutting edge (6) on the outer periphery of a);
The chip discharge groove (main groove 4) opened adjacent to the cutting end face (3) is arranged in the rotation direction (X) of the tool body (1). An opening (11) of an oil hole (9) is formed in the cutting end face (4), and an opening (12) of an oil hole (9) is also formed in the chip discharge groove (4) adjacent to the cutting end face (3). Then formed.

A cutting tool with an oil hole according to a second aspect of the present invention is configured as follows. In this cutting tool with an oil hole (for example, a drill with an oil hole), the outer periphery of the chisel (2) formed on the rotation center line (1a) of the tool body (1) at the tip of the tool body (drill body 1) In addition, a cutting end face (3) as a flank having a predetermined tip cutting edge angle (θ) and a chip discharging groove (main groove 4) opened adjacent to the cutting end face (3) are provided in the tool body (1). ) Rotation direction (1
Lined up in a). The cutting edge (6) is formed on at least one of the edges (5a, 5b) on both sides in the rotation direction (X) of the cutting edge surface (3). An opening (11) of an oil hole (9) is formed in the cutting end surface (3), and an opening (12) of an oil hole (9) is also formed in the chip discharge groove (4) adjacent to the cutting end surface (3). Then formed.

The invention of claim 3 is configured as follows on the premise of the invention of claim 1 or claim 2. The cutting end face (3) and the chip discharge groove (4) are respectively provided in plural, and the rotation direction (X) of the tool body (1) is alternately provided.
Are lined up. An opening (11) of an oil hole (9) is provided in at least one cutting end face (3) of each cutting end face (3), and at least one chip discharging groove (4) of each chip discharging groove (4). 4) Open the oil hole (9) (1
2) is provided.

The oil hole (9) having the opening (11) and the oil hole (9) having the opening (12) may be provided separately from each other, or both oil holes separated from one oil hole (9). The opening (11) may be provided in one of the branch holes and the opening (12) may be provided in the other branch hole.

In the inventions of claims 1 to 3, since the oil flows out through the opening (11) on the cutting end face (3) side and the opening (12) on the chip discharge groove (4) side respectively when the work is cut,
The oil easily spreads not only on the cutting end face (3) but also on the chip discharge groove (4). Therefore, the cutting efficiency can be improved.

* Invention of Claim 4 This invention is configured as follows on the premise of the invention of Claim 1 or Claim 2 or Claim 3.

In the oil hole (9), the opening (11) on the cutting end face (3) side and the opening (12) on the chip discharge groove (4) side are on both sides of the cutting end face (3) in the rotation direction (X). One of the end edges (5a, 5b) is sandwiched and the two are provided close to each other. According to the present invention, the oil tends to spread evenly on the cutting end face (3) and the chip discharge groove (4) in the vicinity of the end edge (5b) of the cutting end face (3). Therefore, the cutting efficiency can be further improved.

* Invention of Claim 5 This invention is configured as follows on the premise of the invention of any one of claims 1 to 4.

In the oil hole (9), the opening (11) on the cutting end face (3) side and the opening (12) on the chip discharge groove (4) side are connected to each other by a communicating portion (13). In this invention, the oil flowing out from the opening (11) on the cutting end face (3) side passes through the communication portion (13) and the opening (1) on the chip discharge groove (4) side.
2) as well as the oil flowing out from the opening (12) on the chip discharge groove (4) side also flows through the communicating portion (13) to the opening (11) on the cutting end face (3) side. The amount of oil flowing out from the opening (11) on the cutting end face (3) side and the amount of oil flowing out from the opening (12) on the chip discharge groove (4) side are easily averaged. Therefore, the oil is likely to spread evenly to the cutting end face (3) and the chip discharge groove (4), so that the cutting efficiency can be further improved.

* Invention of Claim 6 This invention is configured as follows based on the invention of claim 5. The communicating portion is an opening (13) that passes through one of the edges (5a, 5b) on both sides in the rotation direction (X) of the cutting edge surface (3). In the present invention, the oil tends to spread evenly to the cutting end face (3) and the chip discharge groove (4) in the vicinity of the edge (5b) of the cutting end face (3). Therefore, the cutting efficiency can be further improved.

* Invention of Claim 7 This invention is configured as follows on the premise of the invention of Claim 1 or Claim 2 or Claim 3.

An opening (11) on the cutting end face (3) side is provided in the oil hole (9), and an opening (1) on the cutting end face (3) side is formed.
The opening (13) as a communicating portion is continuously provided in 1), and the edges (5a, 5a) on both sides in the rotation direction (X) in the cutting end surface (3).
It was provided so as to pass through one edge (5b) of b), and an opening (12) on the side of the chip discharge groove (4) was provided continuously to the opening (13) as the communicating portion. In the present invention, when the work is cut, does the oil reach the opening (11) on the cutting end face (3) side, the opening (13) as a communicating portion, and the opening (12) on the chip discharge groove (4) side at substantially the same time? Or, from the opening (11) on the cutting end face (3) side to the opening (1) on the chip discharge groove (4) side through the opening (13) as a communication part.
2) sequentially. In that case, each opening (11, 13, 1
In 2), oil outflow resistance is reduced between the work and the cutting end face (3). Therefore, the oil tends to spread on average to the cutting end face (3) and the chip discharge groove (4) in the vicinity of the edge (5b) of the cutting end face (3). Therefore, the cutting efficiency can be further improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION First, a drill with an oil hole according to a first embodiment of the present invention will be described with reference to FIGS. 1 (a) and 2.

A chisel 2 is formed on the center of rotation 1a of the drill body 1 at the tip of the drill body 1 (tool body).
On the outer periphery of the chisel 2, two flanks 3 (cutting end faces) and two main grooves 4 (chip discharge grooves) are alternately arranged in the rotation direction X of the drill body 1. Both flanks 3 form a predetermined tip cutting edge angle θ with each other, and end edges 5 on both sides in the rotation direction X are formed.
A cutting edge 6 is provided on the side of one edge 5a of a and 5b. The main grooves 4 are adjacent to the flanks 3 and are open between their end edges 5a and 5b. Two sub-grooves 7 (chip discharge grooves) are formed on the outer circumferences of both flanks 3. The sub-grooves 7 may be omitted. Both the main grooves 4 and the sub-grooves 7 are respectively extended to the shank 8 on the base end side of the drill body 1 at a predetermined helix angle.

An oil hole 9 having a circular cross section is formed in the drill body 1 from the end face 8a of the shank 8 to both flanks 3 along the rotation center line 1a.
It is open in each. The oil hole 9 should be replaced with the shank 8
You may open from the outer peripheral surface. An extension portion 10a of the thinning 10 is provided in both main grooves 4 at both end edges 5a, 5 of both flanks 3.
oil hole 9 along the edge 5b of b which does not have cutting edge 6
Is formed so as to cut out the inner peripheral surface of the circular shape, and the edge 5b is divided by the open portion 9a of the oil hole 9 at both flanks 3. The open portion 9a of the oil hole 9 includes an opening 11 formed in the flank surface 3, an opening 12 formed in the main groove 4, and an opening 13 (communication portion) connecting the both openings 11 and 12 to each other. . The opening 11 on the flank 3 side and the opening 12 on the main groove 4 side
And are close to each other with the end edge 5b interposed therebetween.

When cutting the workpiece, the oil hole 9 is inserted from the shank 8 side.
The oil that has flowed into the oil reaches the openings 11 and 13 on the flank 3 side and the opening 12 on the main groove 4 side at the opening 9a of the oil hole 9 almost at the same time, and flows out from the openings 11, 12, and 13, respectively. To do. In that case, the outflow resistance of the oil is reduced between the work and the flank face 3 through the openings 11, 12 and 13, and the oil flows between the openings 11, 12 and 13 so that the amount of the outflow oil is reduced. It becomes easy to be averaged. Therefore, in the vicinity of the edge 5b of the flank surface 3, the flank surface 3 and the main groove 4 are likely to spread on average.

Next, a drill with an oil hole according to a second embodiment of the present invention will be described with reference to FIGS. 1 (b) and 2. In the second embodiment, compared with the oil hole 9 of the first embodiment, the form is changed as follows.

An oil hole 9 having a circular cross section is formed in the drill body 1 from the end surface 8a of the shank 8 to both flanks 3 along the rotation center line 1a.
It is open in each. An extension portion 10a of the thinning 10 is provided in the both main grooves 4 at both end edges 5a and 5b of the both flanks 3.
It is formed along the edge 5b which does not have the cutting edge 6, and the edge 5b is divided by the open portion 9a of the oil hole 9 at both flanks 3. The open portion 9a of the oil hole 9 has a circular opening 11 formed in the flank surface 3, a groove-shaped opening 12 formed in the main groove 4, and a groove-shaped opening connecting the openings 11 and 12 to each other. The opening 13 (communication part). The opening 11 on the flank 3 side and the opening 12 on the main groove 4 side are close to each other with the end edge 5b interposed therebetween.

When cutting the workpiece, the oil hole 9 is inserted from the shank 8 side.
The oil that has flowed into the opening 9a of the oil hole 9 sequentially flows from the opening 11 on the flank 3 side to the opening 12 on the main groove 4 side through the opening 13 and flows out from each of the openings 11, 12, 13 respectively. . In that case, the outflow resistance of the oil is reduced between the work and the flank face 3 through the openings 11, 12 and 13, and the oil flows between the openings 11, 12 and 13 so that the amount of the outflow oil is reduced. It becomes easy to be averaged. Therefore, in the vicinity of the edge 5b of the flank surface 3, the flank surface 3 and the main groove 4 are likely to spread on average.

[Brief description of drawings]

1A is a front view showing a drill according to a first embodiment, FIG. 1B is a front view showing a drill according to a second embodiment, and FIG. 1C is a front view showing a conventional drill. It is a figure.

FIG. 2A is a partially enlarged front view of the drill according to the first embodiment, FIG. 2B is a partially enlarged plan view of the same, and FIG. 2C is a partially enlarged side view of the same.

3A is a partially enlarged front view of a drill according to a second embodiment, FIG. 3B is a partially enlarged plan view of the same, and FIG. 3C is a partially enlarged side view of the same.

4A is a partially enlarged front view of a conventional drill, FIG. 4B is a partially enlarged plan view of the same, and FIG. 4C is a partially enlarged side view of the same.

[Explanation of symbols]

1 ... Drill body (tool body), 1a ... Rotation center line, 2 ...
Chisel, 3 ... Relief surface (cutting end surface), 4 ... Main groove (chip discharge groove), 5a, 5b ... Edge, 6 ... Cutting edge, 9 ... Oil hole, 9a ...
Opening part, 11 ... Flank side opening, 12 ... Main groove side opening, 13
... Opening (communication part), θ ... Tip cutting edge angle, X ... Rotation direction.

Claims (7)

[Claims] 1. A cutting end face having a cutting edge and a chip discharge groove opened adjacent to the cutting end face are arranged in the rotational direction of the tool body on the outer periphery of the center of rotation of the tool body at the tip of the tool body. Cutting tool with an oil hole, wherein an opening of an oil hole is formed in the cutting end surface, and an opening of an oil hole is also formed in the chip discharge groove adjacent to the cutting end surface. tool. 2. A cutting end face as a flank having a predetermined tip cutting edge angle on the outer periphery of a chisel formed on the rotation center line of the tool body at the tip end of the tool body, and opened adjacent to the cutting end face. Align the chip discharge groove in the rotation direction of the tool body,
A cutting tool with an oil hole in which a cutting edge is formed on at least one of the edges on both sides in the rotational direction of the cutting end face, in which an opening of an oil hole is formed on the cutting end face, and oil is also applied to the chip discharge groove. A cutting tool with an oil hole, wherein a hole opening is formed adjacent to this cutting end face. 3. A plurality of the cutting end faces and the chip discharge grooves are provided respectively and are alternately arranged in the rotation direction of the tool body, and at least one of the cutting end faces is provided with an oil hole opening. The cutting tool with an oil hole according to claim 1 or 2, wherein at least one of the chip discharging grooves is provided with an oil hole opening. 4. An opening on the cutting end face side and an opening on the chip discharge groove side in the oil hole are provided close to each other with one of the edges on both sides in the rotation direction of the cutting end face sandwiched therebetween. Claim 1 or Claim 2 characterized in that
Alternatively, the cutting tool with oil holes according to claim 3. 5. The oil hole according to claim 1, wherein the opening on the cutting end face side and the opening on the chip discharge groove side are connected to each other by a communicating portion in the oil hole. Cutting tool with oil hole described. 6. The cutting tool with an oil hole according to claim 5, wherein the communicating portion is an opening that passes through one of the edges on both sides in the rotation direction of the cutting end surface. 7. An opening on the cutting end face side is provided in the oil hole, and an opening as a communicating portion is formed continuously with the opening on the cutting end face side, and one of the edges on both sides in the rotation direction of the cutting end face is formed. The cutting tool with an oil hole according to claim 1 or 2 or 3, wherein the cutting tool is provided so as to pass therethrough, and further, an opening on the chip discharge groove side is provided continuously to the opening as the communication portion. .