JPH10175114A - Rotating tool for cutting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating tool for cutting which can supply cutting oil to a cutting part correctly and efficiently without lowering durability of the rotating tool for cutting. SOLUTION: A first oil pass 17 which is connected with an outside cutting oil supply unit 15 to introduce cutting oil into the inside of a tool main body 2 is formed in the tool main body 2. In a locator 4, an oil introducing hole 19 and a scooping side oil ditch 24 which are connected with the first oil pass 17 and also with a hole 3e in a throw-away tip 3 with holes and guide cutting oil to an edge side C of the tip along a tip scooping surface 3a are formed. In a wedge 5, a back side oil ditch 26 which is connected with the hole 3e in the throw-away tip 3 with holes and guides cutting oil to a tip escaping surface 3f side along a tip back side 3b is formed. As a result, it is possible to jet cutting oil from the vicinity of the tip edge in the tip scooping surface 3a side and also to jet cutting oil to the tip escaping surface 3f side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutting tool using a throw-away tip such as a face mill or an end mill, and more particularly to a rotary cutting tool capable of supplying a cutting oil to a cutting portion.

[0002]

2. Description of the Related Art Generally, in metal cutting using a rotary cutting tool such as a face mill or an end mill, a cutting oil is supplied to a cutting portion for the purpose of preventing damage to a chip and extending the life of the chip. In order to cool and lubricate the cutting part.

The following method is known as a method for supplying cutting oil to the cutting portion to cool and lubricate the cutting portion.

First, a first method is to install a cutting oil discharge nozzle on a machine side to which a rotary cutting tool is attached, and to jet the cutting oil from the discharge nozzle toward a cutting portion.

A second method is as shown in FIG.
A cutting oil supply unit 31 is rotatably attached to the tool body 30, and a cutting oil introduction hole 33 communicating with the cutting oil supply unit 31 and opening to the tip pocket 32 is inserted into the tool body 3.
In this method, the cutting oil is ejected toward the cutting portion from the opening of the cutting oil introduction hole 33 on the tip pocket 32 side (see Japanese Patent Application Laid-Open No. 56-89419).

[0006]

However, in milling using a rotary cutting tool, the cutting section to which cutting oil is supplied moves due to the rotation of the tool and a change in the feed direction of the tool.

[0007] Therefore, in the first method, it is difficult to accurately supply the cutting oil to the moving cutting portion.

Further, in the second method, the injection port of the cutting oil (the opening on the tip pocket side of the cutting oil introduction hole 33) is formed in the tool body 30, and the connection between the injection port and the indexable tip 34 is made. Since the positional relationship does not fluctuate due to the rotation of the tool or the change in the feed direction, the cutting oil can be supplied to the cutting portion more accurately than in the first method, but the injection port is separated from the tip edge, It is difficult to efficiently supply the cutting oil to the cutting portion, and the tendency has been remarkably revealed as the rotation speed of the tool is increased.

In the case of a rotary cutting tool 40 that does not use a throw-away tip as shown in FIG. 12, a technique for supplying cutting oil to an edge 43 from an oil hole 42 formed in a tool body 41 is known. But with such technology,
It cannot be applied to rotary cutting tools with locators or wedges that hold the indexable inserts, and because it is not designed to supply cutting oil to the chip scooping surface side, it is necessary to supply cutting oil efficiently to the cutting section (Japanese Patent Laid-Open No.
No. 21217).

Further, as shown in FIG.
A technique is known in which cutting oil 53 introduced from an oil supply path 52 formed on the side of the chip back surface 51b is jetted to the chip scooping surface 51a side. In this conventional technique, cutting which is jetted to the chip scooping surface 51a side is known. After the oil 53 collides with the pressing piece 54, the oil 53 is widely dispersed and ejected from the gap 55 between the pressing piece 54 and the chip 51 in the direction of approximately 180 degrees. Therefore, a large amount of the cutting oil 53 is not supplied to the tip edge (cutting portion) 51c, and the cutting oil 53 is supplied to the tip edge 51c.
(Refer to Official Technical Report No. 96-5282).

In addition, a technique is also conceivable in which a throw-away insert is sandwiched between a tool body and a wedge to form a cutting oil ejection port in the tool body in the vicinity of the cutting edge of the tool. As a result, the durability of the rotary cutting tool is reduced, so that a technique for forming a cutting oil ejection port in a tool body without using a locator cannot be adopted.

Accordingly, an object of the present invention is to provide a rotary cutting tool capable of supplying cutting oil to a cutting portion accurately and efficiently without reducing the durability of the rotary cutting tool.

[0013]

A rotary cutting tool according to the present invention is provided with a tip holding means detachably attached to a tool body.
A rotary cutting tool for fixing a throw-away tip to a tool body by the tip holding means, wherein the tool body communicates with an external cutting oil supply unit to introduce cutting oil into the tool body. And a second oil passage communicating with the first oil passage and guiding the cutting oil along the chip scooping surface to the tip blade tip side. .

As described above, according to the present invention, the flow of the cutting oil toward the tip edge (cutting portion) is formed by forming the second oil passage in the tip holding means along the tip scooping surface toward the tip edge side. After the cutting oil is guided to a position close to the cutting edge, the cutting oil can be sprayed toward the cutting edge, so that the cutting oil is supplied to the cutting portion accurately and efficiently. .

Here, the tip holding means comprises a locator for supporting the throw-away tip, and a wedge for holding the throw-away tip in cooperation with the locator. Then, either the locator or the wedge may be arranged on the scooping surface side of the throw-away tip. When the locator is arranged on the scooping surface side of the throw-away tip, a second oil path is formed in the locator. When the wedge is arranged on the scooping surface side of the throw-away tip, a second oil path is formed in the wedge.

The rotary cutting tool according to the present invention is a rotary cutting tool in which a tip holding means is detachably attached to a tool body, and the indexable insert with holes is fixed to the tool body by the tip holding means. The main body communicates with an external cutting oil supply unit to form a first oil passage for introducing cutting oil into the tool main body, and the tip holding means communicates with the first oil passage. A second oil passage communicating with the hole of the hole-insertable insert, guiding the cutting oil to the hole side of the hole-insertable tip, and guiding the cutting oil along the chip scooping surface to the tip edge side; A third oil passage which communicates with the hole of the indexable insert and guides the cutting oil along the back surface of the insert to the insert flank side.

As described above, according to the present invention, since the chip holding means is provided with the second oil passage and the third oil passage, the cutting oil can be sprayed from the vicinity of the chip edge on the chip scooping surface side. At the same time, the cutting oil can be sprayed to the chip flank. Therefore, the cutting oil is supplied to the cutting portion accurately and efficiently, and the cutting oil is sufficiently supplied to the chip flank which is not hindered by the cutting chips.

Here, the tip holding means comprises a locator and a wedge. Therefore, when the locator is arranged on the chip scooping surface side, a second oil path is formed in the locator, and a third oil path is formed in the wedge. When the wedge is arranged on the chip scooping surface side, the second oil passage is formed in the wedge, and the third oil passage is formed in the locator.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIGS. 1 and 2 show a rotary cutting tool 1 according to a first embodiment of the present invention.

In these figures, at the tip end of the tool body 2, four throw-away tips 3 with holes are arranged at equal intervals in the circumferential direction, and a locator 4 and a locator 4 for holding the throw-away tips 3 with holes are provided. The wedges 5 are arranged, and accommodation grooves 6 and 7 for accommodating the locator 4 and the wedges 5 are formed (see FIG. 5). A screw hole 10 is formed in the bottom 6a of the accommodation groove 6 for accommodating the locator 4, and the fixing bolt 9 of the locator 4 is screwed into the screw hole 10 (FIG. 5 ( a)). A screw hole 12 is formed in the bottom 7a of the accommodation groove 7 for accommodating the wedge 5, and the screw 11 for attaching the wedge 5 is screwed into the screw hole 12 (FIG. 5 ( a)). Note that the accommodation groove 7 of the wedge 5 is provided in a predetermined manner with respect to the accommodation groove 6 of the locator 4 so that when the wedge 5 is tightened, the throwaway tip 3 with a hole can be pressed toward the locator 4 by the slope 5 a of the wedge 5. It is formed so as to be inclined at an angle (see FIGS. 5B and 7A).

A boss end portion 13 of the tool body 2 has a circumferential groove 1 communicating with a cutting oil supply portion 15 on the main shaft 14 side of the machine.
6, 16 are formed (see FIG. 3). The same number of the first oil passages 17 as the number of the locators 4 are formed so as to communicate the circumferential grooves 16, 16 with the accommodation grooves 6 of the locator 4 (see FIG. 3). The first oil passage 17 is provided when the locator 4 is mounted in the accommodation groove 6 as described later.
It communicates with the oil introduction hole 19 of the locator 4 (see FIG. 4), and extends from the circumferential groove 6 in the axial direction (downward in FIG. 1).
And a lateral hole 17b communicating the axial hole 17a with the receiving groove 6 of the locator 4 (see FIG. 5). At the center of the tool body 2, a mounting hole 18 is formed (see FIGS. 2 and 3). The hole 18 accommodates fixing means (not shown) for fixing the tool body 2 to the main shaft 14 of the machine. In addition, the boss end 13 is formed with a key groove 18a for engaging a key (not shown) on the main shaft side of the machine.

As shown in detail in FIG. 6, the locator 4 has a tip scooping surface 3a of the hole-insertable tip 3.
Chip supporting surface 20 supporting the side, and chip side surfaces 3c and 3d
(See FIG. 8). The locator 4 has the first
An oil introduction hole 19 communicating with the oil passage 17 is formed. The oil introduction hole 19 is connected to the hole 3 e of the holed insert 3 and the first oil passage 17 of the tool body 2.
The locator 4 is formed obliquely from the back surface 23 to the chip seat surface 20. Then, the tip seating surface 20 of the locator 4
Is formed with a scooping surface side oil groove 24 which communicates with the oil introduction hole 19 and opens toward the tip edge side (arrow C direction) (see FIG. 8). The oil introduction hole 19 and the scooping surface side oil groove 24 form a second oil passage. In FIG. 6, the bolt receiving hole 2 is located on the right end side of the locator 4.
5 is formed, and the bolt 9 shown in FIG. 1 is accommodated in the bolt accommodation hole 25. FIG.
As shown in (b), a counterbore 24a is formed on the chip seating surface 20 side of the oil introduction hole 19 to facilitate communication between the oil introduction hole 19 and the hole 3e of the indexable tip 3.

As shown in detail in FIG. 7, the wedge 5 has an upright wall 5b guided by a side wall 7b of the receiving groove 7 of the tool body 2.
And an inclined wall 5 a for pressing the back surface 3 b of the throw-away tip 3 with holes toward the locator 4. And
The inclined wall 5a of the wedge 5 communicates with the hole 3e of the holed insert 3 and has a back side oil groove (third oil passage) that opens toward the tip edge (C direction (see FIG. 8)). ) 2
6 is formed. The wedge 5 has a large-diameter portion 26a formed at the end of the rear-side oil groove 26 in order to facilitate communication between the hole 3e of the perforated throw-away tip 3 and the rear-side oil groove 26.

According to the present embodiment having such a configuration,
The cutting oil introduced through the first oil passage 17 of the tool main body 2 passes through the oil introduction hole 19 of the locator 4 and the scooping surface side oil groove 24, and the chip scooping surface from a position close to the chip edge (cutting portion). It is ejected along 3a and toward the tip edge (cutting portion) side (direction C in FIG. 1). Also, the cutting oil flowing through the oil introduction hole 19 of the locator 4 passes through the hole 3e of the perforated indexable insert 3, flows into the back side oil groove 26, and further along the back side oil groove 26. And is ejected toward the chip flank 3f (the direction C in FIG. 1).

Therefore, according to the present embodiment, a sufficient amount of the cutting oil can be supplied to the cutting portion accurately and efficiently, and a sufficient amount of the cutting oil can be supplied to the chip flank 3f which is not hindered by the chips. Since the cutting oil can be supplied, the cutting portion can be effectively lubricated and cooled.

Further, in this embodiment, since the cutting oil flows through the hole 3e of the throw-away tip 3, the cutting heat generated in the throw-away tip 3 can be cooled from inside the tip, and the chip scooping surface 3a side can be cooled. Cooling and chip flank 3f
Together with the cooling on the side, the throw-away tip 3 can be effectively cooled. Therefore, according to the present embodiment, the reliability of the insert cutting edge can be significantly improved, and a stable tool life can be obtained.

Furthermore, in the present embodiment, although the indexable insert 3 is held between the locator 4 and the wedge 5, the cutting oil can be jetted at a position close to the cutting edge. The cooling and lubrication of the cutting part can be effectively performed without impairing the durability of the tool body 2.

In addition, according to the present embodiment, although the cutting oil is sprayed from the two positions of the chip scooping surface 3a and the chip flank 3f as described above, the tool body 2 It is sufficient to form only the first oil passage 17, so that the drilling of the tool body 2 is facilitated.

(Second Embodiment) FIG. 9 shows a rotary cutting tool 1 according to a second embodiment of the present invention.

As shown in FIG. 9, this embodiment is
The tip back side 3b of the holed throw-away tip 3 is supported by a locator 4, and a wedge 5 is disposed on the tip scooping face 3a.
The locator 4 and the locator 4 cooperate to clamp the indexable insert 3 with a hole.

The tool body 2 has a first oil passage 17 communicating with a cutting oil supply section (not shown) on the main shaft side of the machine.

The locator 4 has an oil introduction hole 19 communicating with the first oil passage 17 of the tool main body 2. The oil introduction hole 19 of the locator 4 is formed obliquely so as to communicate the hole 3 e of the perforated indexable insert 3 with the first oil passage 17. The locator 4 has an oil introduction hole 19.
The back side oil groove (third side) that guides the cutting oil toward the chip flank 3f (the direction C in FIG. 9) along the chip back surface 3b.
Oil passage) 26 is formed.

The wedge 5 has a throw-away tip 3 with a hole.
And a scooping surface side oil groove 24 for guiding the cutting oil to the tip edge side (direction C in FIG. 9) along the chip scooping surface 3a.

In this embodiment, the locator 4
The oil introduction hole 19 and the scooping surface side oil groove 24 of the wedge 5 constitute a second oil passage.

According to this embodiment as well, the cutting oil can be supplied to the tip edge (cutting portion) side C of the chip scooping surface 3a accurately and efficiently, and the cutting oil can be supplied to the chip flank 3f side. Therefore, the same effects as in the first embodiment can be obtained.

(Third Embodiment) FIG. 10 shows a rotary cutting tool 1 according to a third embodiment of the present invention. The present embodiment is common to the first and second embodiments in that the throw-away tip 3 is sandwiched between the locator 4 and the wedge 5, but the tip is not the throw-away tip 3 with a hole, but has no hole. The difference is that the indexable tip 3 is used.

That is, in the present embodiment, an oil introduction hole (second oil passage) communicating with the first oil passage 17 formed in the tool body 2 is provided.
19 is formed in the locator 4 and the oil introduction holes 19 are formed.
And a scooping surface side oil groove (second oil passage) 24 for guiding cutting oil to the tip blade side along the chip scooping surface 3a.
Is formed on the locator 4.

In the present embodiment, even when the throw-away tip 3 with a hole is used, the hole 3e is closed by the wedge 5, and as a result, the same as the case where the throw-away tip 3 without a hole is used. The effect can be obtained. That is, the present embodiment can also be applied to the indexable insert 3 with a hole.

According to the present embodiment having such a configuration,
Cutting oil introduced from a cutting oil supply unit (not shown) on the main shaft side of the machine via the first oil passage 17 passes through the oil introduction hole 19 of the locator 4 and the scooping surface side oil groove 24, and the tip of the cutting edge From the position close to the tip edge side (the direction C in FIG. 10). Therefore, according to the present embodiment, the cutting oil is supplied to the cutting portion accurately and efficiently, and the cutting portion is sufficiently cooled and cooled.
Because of the lubrication, the life of the chip can be prolonged.

In each of the above-described embodiments, the manner in which the throw-away tips 3 are arranged at equal intervals at four locations in the circumferential direction has been described. However, the present invention is not limited to this. It can be appropriately modified depending on cutting conditions and the like. Although the throw-away tip 3 is shown as a round piece, the present invention is not limited to this, and the throw-away tip 3 having various shapes such as a triangle, a square, and a rhombus can be used. Furthermore, each of the embodiments described above shows the positive type throw-away tip 3, but can be applied to the case where the negative type throw-away tip 3 is used. In addition, in each of the above-described embodiments, the mode in which the scooping surface side oil groove and the back surface side oil groove are formed in the direction C in FIG. 1 is shown. However, the present invention is not limited to this. Considering this, the direction can be changed as appropriate.

[0042]

As apparent from the above description, the rotary cutting tool of the present invention communicates with the first oil passage of the tool body and guides the cutting oil along the chip scooping surface to the tip edge side. A second oil passage is formed in the tip holding means to forcibly generate a flow of the cutting oil toward the tip edge (cutting portion), and guide the cutting oil to a position close to the tip edge. Can be injected toward the tip of the insert, so that the cutting oil is supplied to the cutting portion accurately and efficiently, and the cutting portion is sufficiently lubricated and cooled. Therefore, according to the present invention, the reliability of the cutting edge of the indexable insert is significantly improved, and a stable tool life can be obtained.
Further, according to the present invention, since the indexable insert is held by the insert holding means, the lubrication and cooling of the cutting portion can be sufficiently performed without lowering the durability of the tool body. it can.

Further, the rotary cutting tool according to the present invention has a second oil which communicates with the first oil passage of the tool body and the hole of the indexable insert and guides the cutting oil along the chip scooping surface to the tip blade tip side. Forming a path and a third oil path communicating with the hole of the holed throw-away insert and guiding the cutting oil to the chip flank along the back surface of the chip, in the chip holding means, and chipping the cutting oil. Since the cutting oil can be sprayed to the chip flank side while the cutting oil is sprayed from the position near the chip edge on the surface side, the cutting oil is supplied accurately and efficiently to the cutting portion, and the cutting oil is cut by the chips. The chips are sufficiently supplied to the unimpeded chip flank side. Therefore, according to the present invention, the cutting portion and the indexable insert can be effectively lubricated.
Cooling can be performed, the reliability of the cutting edge of the indexable insert can be further improved, and a more stable tool life can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a rotary cutting tool according to a first embodiment of the present invention.

FIG. 2 is a front view of the rotary cutting tool.

FIG. 3 is a rear view of the rotary cutting tool.

FIG. 4 is a partial cross-sectional view along the line AA in FIG. 1;

FIG. 5 is a machining state diagram of the rotary cutting tool body according to the first embodiment of the present invention. FIG. 5A is a processing state diagram of a locator and a groove for accommodating a wedge, and FIG. 5B is a cross-sectional view taken along line BB of FIG. 5A.

FIG. 6 is a detailed view of a locator. FIG. 6A is a plan view of the locator, and FIG. 6B is a front view of the locator.

FIG. 7 is a detailed view of a wedge. FIG. 7A is a front view of the wedge, and FIG.
(B) is a view in the direction of arrow D in FIG. 7 (a).

FIG. 8 is a combined state diagram of a locator and a throw-away tip. FIG. 8A is a front view, and FIG. 8B is a rear view.

FIG. 9 is a side view of a main part of a rotary cutting tool according to a second embodiment of the present invention.

FIG. 10 is a side view of a rotary cutting tool according to a third embodiment of the present invention.

FIG. 11 is a front view of a rotary cutting tool showing a first conventional example.

FIG. 12 is a front view of a rotary cutting tool showing a second conventional example.

FIG. 13 is a view showing a third conventional rotary cutting tool. FIG.
3A is a side view of the rotary cutting tool, and FIG. 13B is a plan view of the rotary cutting tool.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotary cutting tool 2 tool body 3 indexable insert 3a chip scooping surface 3b chip back surface 3e hole 3f chip clearance surface 4 locator (tip holding means) 5 wedge (chip holding means) 6 accommodation groove 15 cutting oil supply section 17 first Oil passage 19 Oil introduction hole (second oil passage) 24 Scooping surface side oil groove (second oil passage, third oil passage) 26 Plane side oil groove (second oil passage, third oil passage) C Tip edge side

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kaoru Yamada 580 Horikawacho, Saiwai-ku, Kawasaki City, Kanagawa Prefecture Inside Solid Square Toshiba Tungaloy Co., Ltd. (72) Inventor Ken Nakagawa 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation

Claims (5)

[Claims] 1. A rotary cutting tool for removably attaching a tip holding means to a tool body and fixing a throw-away tip to the tool body by the tip holding means, wherein the tool body communicates with an external cutting oil supply unit. And forming a first oil passage for introducing cutting oil inside the tool body, the chip holding means communicating with the first oil passage, and cutting oil along the chip scooping surface toward the tip edge of the chip. A rotary cutting tool, wherein a second oil passage for guiding is formed. 2. A rotary cutting tool in which a tip holding means is detachably attached to a tool main body, and the hole-insertable insert is fixed to the tool main body by the tip holding means. Forming a first oil passage for introducing cutting oil into the inside of the tool body, and the tip holding means is connected to the first oil passage and to the hole of the indexable insert with a hole. And
A second oil passage that guides the cutting oil to the hole side of the holed throw-away insert and guides the chip oil along the chip scooping surface to the tip blade tip side; And a third oil passage for guiding the oil along the chip back surface to the chip flank side. 3. A rotary cutting for forming a receiving groove of a locator for supporting a chip scooping surface side in a tool body, and holding a throw-away chip between a locator stored in the storing groove of the locator and a wedge arranged on the back side of the chip. In the tool, the tool main body forms a first oil passage communicating with an external cutting oil supply unit and guiding cutting oil to a housing groove of the locator, and the locator includes the first oil passage. While communicating with
An oil introduction hole for guiding the cutting oil to the chip scooping surface side, and a scooping surface side oil groove communicating with the oil introduction hole and guiding the cutting oil to the chip blade tip side along the chip scooping surface are formed. A rotary cutting tool characterized by the following. 4. A receiving groove of a locator for supporting a chip scooping surface side is formed in a tool body, and a locator housed in the receiving groove of the locator and a wedge arranged on the back side of the chip sandwich a hole-away insert chip. In the rotary cutting tool, the tool body communicates with an external cutting oil supply unit and forms a first oil passage that guides cutting oil to a housing groove of the locator, and the locator includes the first oil passage. While communicating with the oilway,
An oil introduction hole communicating with the hole of the holed throw-away tip, and a scooping surface-side oil groove communicating with the oil introduction hole and guiding cutting oil along the chip scooping surface to the tip edge side,
A rotary cutting tool, characterized in that the wedge is formed with a back side oil groove communicating with a hole of the perforated indexable insert to guide cutting oil to a chip flank. 5. A receiving groove of a locator for supporting a chip rear side is formed in a tool body, and a throw-away insert with a hole is sandwiched between a locator stored in the receiving groove of the locator and a wedge arranged on a chip scooping surface side. In the rotary cutting tool, a first oil passage communicating with an external cutting oil supply unit and guiding cutting oil to a housing groove of the locator is formed in the tool body, and the locator has a first oil passage. While communicating with the oilway,
Forming an oil introduction hole communicating with the hole of the holed throw-away tip, and a back side oil groove communicating with the oil introduction hole and guiding the cutting oil along the chip back surface to the chip flank side. A rotary cutting tool, wherein the wedge is formed with a scooping surface side oil groove communicating with a hole of the holed throw-away insert and guiding a cutting oil along a chip scooping surface to a tip blade side. .