JP3117533B2 - Face mill with chip evacuation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to such a flattening of the workpiece
Relates to a face milling cutter having a chip discharge device for use, in particular, it relates to a face mill that elimination of the chips to produce a result of cutting with a chip discharge device is improved.

[0002]

2. Description of the Related Art A milling tool provided with a chip discharging device has been developed for the purpose of improving the removability of chips generated as a result of cutting in a face mill or the like. Hereinafter, an example of a throwaway type face milling machine will be described as a milling tool provided with a conventional chip discharging device , and this face milling machine will be described with reference to FIGS. 6 and 7.

In FIGS. 6 and 7, reference numeral 1 denotes a tool body. The tool body 1 has a cylindrical shape having a small-diameter portion formed at one end, and a plurality of tip mounting seats 2 opened radially outward around the tip of the tool body 1 on the outer periphery of the tip portion.
Are formed at equal intervals along the circumferential direction.

[0004] A throw-away tip (hereinafter abbreviated as tip) 3 is fixed to the tip mounting seat 2 by a clamp mechanism 4 so as to be detachable. Further, a front cutting edge 3a is provided on one side of the tip 3 protruding from the front end surface of the tool main body 1, and an outer peripheral cutting blade 3b is provided on one side protruding at the front end of the outer peripheral surface of the tool main body 1.

Further, as shown in FIG. 7, the front of the tool body 1 in the cutting rotation direction is cut out in an arc shape toward the tip of the tool body 1 and radially outward, respectively.
Is formed. Furthermore, on the tip surface of the tool body 1,
A chip guide member 6 for guiding and discharging the chips generated by the cutting blades 3a and 3b into a chip discharge space described below is embedded and fixed with a flathead screw 7. The chip guide member 6 has a flat plate annular shape, and the same number of hook-shaped pieces 6a as the chips 3 are formed on the outer periphery at equal intervals in the circumferential direction.

Reference numeral 8 denotes a mounting hole that passes through the axis of the tool body 1. The shaft portion 9a of the arbor 9 inserted from the small diameter side of the tool body 1 is fitted into the mounting hole 8, and furthermore,
The tool body 1 is fixed to the arbor 9 by fastening bolts 10. A large-diameter shaft portion 9b is formed at the rear end of the shaft portion 9a of the arbor 9, and a bearing 11 is fixed to the large-diameter shaft portion 9b. 12 are fitted. The chip storage body 12 is connected to a cover 13 fixed to an outer ring of the bearing 11 by bolts 14 and is rotatable about the axis of the tool body 1.

The chip storage body 12 is a thin hollow cylindrical body that covers the tool body 1 and the outer peripheral cutting edge 3b, and is located between the inner peripheral surface of the chip storage body 12 and the outer peripheral surface of the small diameter portion of the tool main body 1. A chip discharge space 15 for storing chips guided by the chip pocket 5 is formed. Further, a through hole 12a is formed in the outer peripheral surface of the chip storage body 12, and one end of the connection pipe 16 is fitted into the through hole 12a.
One end of a duct hose 17 is fitted to the other end of the connecting pipe 16, and the other end of the duct hose 17 is connected to a suction machine (not shown) for sucking and discharging air in the chip discharge space 15. ing. In addition, a dust collector is used as a suction machine.
Some have been used.

On the other hand, a taper shank 9c is provided on the side of the arbor 9 opposite to the shaft portion 9a.
By fixing the main shaft 18 of the machine tool to c, the tool body 1 is mounted on the machine tool.

Next, the plane machining of the work W using the face mill having the above configuration will be described below. As shown in FIG. 6, after mounting the tool body 1 on the machine tool,
The work material W is fixed on a worktable (not shown) so that the surface to be processed is orthogonal to the axis of the main shaft 18, and the work is moved by moving the main shaft 18 or the worktable in the axial direction of the main shaft 18. Material W
The main shaft 18 or the work table is moved in a direction orthogonal to the axis of the main shaft 18 while making a cut on the surface of the main shaft 18.
As a result, the surface of the workpiece W is cut by the front cutting edge 3a and the outer peripheral cutting edge 3b.

The chips generated by the cutting are guided to the gap between the rake face of the chip 3 and the end face of the hook-shaped piece 6a of the chip guide member 6, and are discharged to the chip pocket 5, and are discharged through the chip pocket 5. It is guided to the chip discharge space 15, and is further sucked and collected into the suction machine through the connecting pipe 16 and the duct hose 17.

[0011]

Here, in the above-mentioned conventional face milling machine, the chips guided into the chip discharge space 15 are exclusively sucked and removed from the through holes 12a to the suction machine. However, the suction force in the chip discharge space 15 decreases as the distance from the through hole 12a increases, and becomes lowest at a position facing the through hole 12a with the tool body 1 interposed therebetween. Therefore, in the case of the above-mentioned conventional face milling machine, the rejection of the chips in the chip discharge space 15 is reduced mainly at a position opposed to the through hole 12a with the tool body 1 interposed therebetween. , And tended to scatter or stay on the surface of the work material W, on the machine tool, or around them.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cutting machine which is formed by interrupted cutting.
Regarding the swarf, especially including fine swarf and dust that are easily blown by centrifugal force and easily adhere to the inner wall of the swarf housing,
An object of the present invention is to provide a face mill having a chip discharging device excellent in rejection in a chip discharging space.

[0013]

According to the present invention, there is provided a face mill provided with a chip discharging device according to the present invention, wherein cutting blades are arranged at predetermined intervals on a tip outer peripheral side of a tool body rotating about an axis,
A chip guide member is provided with a gap in the rake face of the cutting blade.
Is, said substantially cylindrical chip container on the outer periphery of the tool body are arranged, cut to form a chip discharge space between the inner peripheral surface and the tool body of the chip container, the cut waste
A first through hole is formed in the storage body, and a chip discharging device configured to guide the chips generated by the cutting blade through the gap into the chip discharging space and discharge the chips from the first through hole. In the face mill provided with, a second through-hole is formed in the chip storage body at a position where chips in the chip discharge space are scattered by centrifugal force of the tool main body. An air jet pump for ejecting air from the second through hole into the chip discharge space is connected.
It is characterized by the following.

[0014]

When cutting a work material using this face mill , the divided chips generated by the cutting blade for intermittent cutting are
Chip discharge through the gap between the chip guide member and the rake face
Cutting by the centrifugal force of the rotating tool body guided in the space
Debris is blown outwards, especially fine chips and dust.
Dust and the like easily stick to the inner wall of the chip storage
Chips are forced by air ejected from the second through hole
Can be blown off in the direction of the first through hole
It can be guided and discharged out of the chip storage body. As a result,
Efficiency without causing chips to adhere to the inner wall of the chip storage
Guide to the outside from inside the chip discharge space
Becomes possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in more detail with reference to FIGS. In each of the drawings, components having the same configuration as those in FIGS. 6 and 7 are denoted by the same reference numerals, and description thereof is omitted.

1 to 3, reference numeral 1 denotes a tool main body. The tool body 1 is a cylindrical body having a small diameter portion like the above-mentioned conventional face milling machine, and a plurality of chip mounting seats 2 and chip pockets 5 are formed on the outer periphery of the tip along the circumferential direction. A tip 3 having a front cutting edge 3a and an outer peripheral cutting edge 3b is detachably fixed to a predetermined position on the seat 2 by a clamp mechanism 4 including a wedge member 4a and a clamp screw 4b.

Further, a chip guide member 6 for guiding and discharging chips generated by the cutting blades 3a and 3b to a chip discharge space described later is provided on the tip end surface of the tool body 1.
However, the surface is slightly retracted in the axial direction from the front cutting edge 3a, and is embedded, and is fixed by the flathead screw 7. FIG. 4 shows the shape of the chip guide member 6. The chip guide member 6 is formed in a flat plate shape, and the same number of hook-shaped pieces 6a as the chips 3 are formed on the outer periphery at equal intervals in the circumferential direction.
The outer diameter is slightly smaller than the turning diameter of the outer peripheral cutting edge 3b, and when fixed to the tip end surface of the tool body 1,
As shown in FIGS. 1 and 2, the outer peripheral surface of the hook-shaped piece 6 a
The outer peripheral cutting edge 3b of the tip 3 is located slightly inward in the radial direction of the tool body 1 in a retreating manner.

When the hook-shaped piece 6a is fixed to the tool body 1 as shown in FIGS. 2 and 3, the hook-shaped piece 6a covers the chip pocket 5 and closes the chip discharge space described later. A slight gap is created between the tip surface 6b and the rake face of the tip 3, and the cutting edges 3a, 3
The shape is determined so that the chips scraped off from the work material surface by b are guided to the chip pocket 5.

At the tip of the hook-shaped piece 6a,
As shown in FIGS. 3 and 4, a groove 6 c opened toward the bending direction of the hook-shaped piece 6 a and the mounting surface side of the chip guide member 6 is formed, and the rake face of the chip 3 and the hook-shaped piece 6 a are formed.
The inside of the gap between the tip end surface 6b in the bending direction is enlarged to prevent clogging of chips passing through the gap.

On the other hand, as shown in FIG.
The shaft portion 9a of the arbor 9 is fitted into the mounting hole 8, and the fastening bolt 10 is screwed into the end surface of the shaft portion 9a of the arbor 9 from the large-diameter end surface of the tool body 1 so as to be coaxial and integral with the arbor 9. Fixed. On the opposite side of the shaft portion 9a of the arbor 9, there is provided a tapered shank 9c for fitting with the tapered hole 18a of the main shaft 18, and at the tip of the tapered shank 9c, there is provided a pull-stat type face mill and a main shaft 18a. And a female screw portion (not shown) for firmly connecting the first and second members.

Further, at the rear end of the shaft portion 9a of the arbor 9,
A large-diameter shaft portion 9b is formed, and a bearing 11 is fixed to the large-diameter shaft portion 9b by a retaining ring 19, and a chip housing 12 is fitted to the outer ring of the bearing 11. The chip storage body 12 is integrally connected to a cover 13 fitted on the outer ring of the bearing 11 from the opposite side by a bolt 14, and is rotatable coaxially with the tool body 1.

This chip storage body 12 is shown in FIGS.
As shown in FIG. 5, a thin hollow cylindrical body covering the tool body 1 and the outer peripheral cutting edge 3b, the inner diameter of which is between the inner peripheral surface of the chip storage body 12 and the outer peripheral surface of the tool body 1 small diameter portion. The chip discharge space 15 has a sufficient volume to accommodate the chips discharged through the chip pocket 5.

Further, the inner peripheral surface near the bearing 11 is narrowed to a degree slightly larger than the small diameter portion of the tool body 1, and as a result, the sealing property of the chip discharge space 15 and the dustproof effect on the bearing 11 are enhanced. ing. Further, the tip end surface of the chip storage body 12 is slightly retreated in the axial direction from the portion of the outer peripheral cutting edge 3b of the chip 3 cut into the work material, and the inner peripheral surface of the tip end portion is the outer peripheral cutting edge. Blade 3
It is narrowed to a degree slightly larger than the turning diameter of b.

On the other hand, through holes 12 are provided at positions on the outer peripheral surface of the chip storage body 12 opposite to each other with the tool body 1 interposed therebetween.
a, 12b are formed, and connecting pipes 20, 21 are connected to the through holes 12a, 12b, respectively.

The flange portion 21 of the connecting pipe 21
a has an exhaust port 22 of a first air jet pump (air supply mechanism) 22 for supplying air into the chip discharge space 15.
b, and a second air jet pump (a chip discharging machine) for sucking and discharging air in the chip discharging space 15 is connected to the flange portion 20a of the connecting pipe 20.
Structure ) 23 is connected to an intake port 23a. One end of a duct hose 17 is fitted into the exhaust port 23b of the second air jet pump 23.

The air jet pumps 22, 23 are
The body 2 4 having a cylindrical shape, an annular air chamber 24a to go around the side wall portions in the circumferential direction is provided, the air ejection path 24b which forms a tapered shape toward this air chamber 24a on the inner peripheral surface leading end side of the main body 24 to form a, the inner peripheral surface of the most contracted in the openings near the air injection passage 2 4 b, which was gradually increased in diameter toward the proximal and distal from the opening, the body 24 Of the intake port 2
2a and 23a and exhaust ports 22b and 23b.

An air supply port 25 is formed in the air chamber 24a, a nipple 26 is fitted into the air supply port 25, and the nipple 26 is connected to an air supply source (not shown) for supplying compressed air. One end of the air hose 27 is connected via a coupling 28.

Next, a description will be given of a procedure in the case where the face mill having the above-described configuration is used to perform a plane processing of a work material (not shown). First, as shown in FIG. 1, the tapered shank 9c of the arbor 9 is inserted into the tapered hole 18 of the main shaft 18.
Then, the arbor 9 is pulled up in the axial direction of the main shaft 18 and the arbor 9 is fixed to the main shaft 18 via the main shaft key 18b, so that the face mill is mounted on the main shaft 18.

Next, the work material is fixed on a work table (not shown) so that the work surface is orthogonal to the axis of the main shaft 18. Then, the main shaft 18 is rotated around its axis,
While moving the main shaft 12 or the work table in the axial direction of the main shaft 18 to give a predetermined cut to the surface of the work material,
The spindle 18 or the work table is moved in a direction orthogonal to the axis of the spindle 18.

At the start of cutting, the air jet pumps 22 and
23 is supplied with compressed air. In this case, the pressure of the compressed air supplied to the first air jet pump 22 is equal to or less than the pressure of the compressed air supplied to the second air jet pump 23.

The chips which have been peeled off from the surface of the work material by the front cutting edge 3 a during the cutting are removed from the surface side of the chip guide member 6 by the rake face of the chip 3 and the hook-shaped piece of the chip guide member 6. It is guided to the gap between the end face 6a and the chip pocket 5 to be discharged. The chips peeled off from the surface of the work material by the outer peripheral cutting edge 3b are supplied to the chip guide member 6.
From the outer peripheral side of the chip 3 is guided into the gap between the rake face of the chip 3 and the end face of the hook-shaped piece 6a of the chip guide member 6, and is discharged into the chip pocket 5.

As described above, new chips are discharged one after another into the chip pocket 5, guided by the chip pocket 5 and pushed up into the chip discharge space 15. By the way, in the air jet pumps 22 and 23, the compressed air supplied from the air hose 27 is jetted at a high speed from the air chamber 24a to the distal end side of the main body 24 via the air jet passage 24b, and the jetting portion of this air is Because it is reduced in diameter,
The pressure at the jetting part decreases. Moreover, since the air on the base end side of the main body 24 is pulled by the inertial force of the ejected air,
A large amount of air is suctioned from the intake ports 22a and 23a and discharged to the exhaust ports 22b and 23b.

As a result, in the face milling machine of the present embodiment, the first air jet pump 22, as shown by the arrow in FIG.
An air flow is formed toward the second air jet pump 23 via b and 12a. Moreover, the through hole 12a
And the through hole 12b are formed at positions facing each other with the tool body 1 interposed therebetween, so that the chips guided to the chip discharge space 15 are blown off by the air ejected from the through holes 12b, and the through holes 12a Is forcibly guided in the vicinity of.
Then, the air is forcibly sucked from the through hole 12a and discharged together with the air via the connecting pipe 20, the second air jet pump 23 and the duct hose 17.

As described above, since the pressure of the compressed air supplied to the first air jet pump 22 is set to be equal to or less than the pressure of the compressed air supplied to the second air jet pump 23, The pressure in the discharge space 15 is a negative pressure compared to the outside air. As a result, air is blown into the chip discharge space 15 from a gap formed between the inner peripheral surface of the tip end portion of the chip housing 12 and the outer peripheral surface of the tool body 1, and the surface of the work material is removed from the gap. Of chips around the machine and machine tools is prevented.

As described above, in the face milling machine of this embodiment, the chips generated by the cutting blades 3a and 3b during the processing are separated by the chip guide member 6 into the chip pocket 5
And the air is ejected from the first air jet pump 22 through the through-hole 12b and is forcibly guided to the vicinity of the through-hole 12a. Further, the chip storage body 1 is forcibly sucked by the first air jet pump 23 and is sequentially taken with the air.
5 is discharged outside. Therefore, chips in the chip discharge space 15 can be uniformly removed, and the accumulation of chips on the surface of the work material is positively prevented.

As a result, there is no occurrence of cutting edge loss or deterioration of the machined surface during machining, and there is no risk of accuracy deterioration due to thermal deformation of the work material or machine, and the accuracy and life of the machine tool due to intrusion of chips. Can not be reduced.

In particular, since an air jet pump is used as the chip discharging mechanism , there is an effect that a large amount of air in the chip discharging space 15 can be sucked. In addition, the air jet pump exerts a suction force simply by supplying air, so that it can be installed easily and inexpensively, and since there is no rotating mechanism, there is no failure due to biting of chips or the like, and maintenance is easy. .

FIG. 5 shows an example of the air supply mechanism in which the air hose 27 is directly connected to the through hole 12c via the connecting member 29.
This is an example in the case where is attached. In this case, the chip discharge space 15 is provided from the air hose 27 to the through hole 12.
Since an air flow is formed toward the second air jet pump 23 via c and 12a, the same effect as in the above embodiment can be obtained.

[0039] In the present embodiment has been described indexable face milling tool, positive present invention
The face milling is not limited to this, and can be sufficiently applied to an integrated face milling tool in which a carbide tip is brazed to a tool body.

The opening positions of the through holes 12a, 12b and 12c are most preferably positions where chips generated by the cutting blades 3a and 3b are scattered by the centrifugal force of the tool body 1. In this case, the through holes 12b and 12c are
It is better to aim the chip in the direction in which the chips are flying
Good. Furthermore, the number of the through holes 12a, 12b, 12c is not limited to two, but if a plurality of the through holes 12a, 12b, 12c are provided, the chip suction effect can be further enhanced. The through hole 12a is the first through hole.
The holes and the through holes 12b and 12c constitute the second through hole.

[0041]

As described above, according to the face mill provided with the chip discharge device according to the present invention, the chips in the chip discharge space are stored in the chip storage space by the centrifugal force of the tool body. Since a second through hole is formed at the position where the air scatters, and an air jet pump that ejects air from the second through hole into the chip discharge space is connected to the second through hole ,
The generated chips were guided into the chip discharge space
After that, the air supplied from the air jet pump is forcibly guided to the first through hole and discharged out of the chip storage body.
Will be done. Especially, in the chip discharge space, the chips are blown outward by the centrifugal force of the rotating tool body, and particularly fine chips and dust among the chips are liable to stick to the inner wall of the chip container. These chips can be forcibly blown off by air ejected from the second through hole, and can be forcibly guided in the direction of the first through hole and discharged. Therefore, the chips in the chip discharge space
Eliminates debris without adhering to the inner wall of the chip storage
It becomes possible.

As a result, the chips in the chip discharge space can be uniformly removed, and the accumulation of chips on the surface of the work material is positively prevented. Defects of the cutting edge and deterioration of the machined surface due to the biting of the chips are prevented, and the cutting material as a heat source does not cause thermal deformation of the work material or the machine tool, so that high machining accuracy is maintained.

[Brief description of the drawings]

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

FIG. 2 is a bottom view of the tool showing the first embodiment of the present invention.

FIG. 3 is an enlarged view of a tool edge portion showing the first embodiment of the present invention.

FIG. 4 is a plan view of a chip guide member according to the present invention.

FIG. 5 is a sectional view of a tool showing a second embodiment of the present invention.

FIG. 6 is a sectional view of a tool showing an example of a conventional milling tool.

FIG. 7 is a bottom view of a tool showing an example of a conventional milling tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool main body 2 Tip mounting seat 3 Indexable insert (tip) 3a Front cutting edge 3b Outer peripheral cutting edge 4 Clamp mechanism 4a Wedge member 4b Clamp screw 5 Tip pocket 6 Chip guide member 6a Hook piece 6b Bending direction of hook piece 6c Groove 7 Countersunk screw 8 Mounting hole 9 Arbor 9a Arbor shaft 9b Large diameter shaft 9c Taper shank 10 Tightening bolt 11 Bearing 12 Chip storage body 12a, 12b, 12c Through hole 13 Cover 14 Bolt 15 Cut Dust discharge space 16, 20, 21 Connecting pipe 17 Duct hose 18 Main shaft 18a Tapered hole 18b Main shaft key 19 Retaining ring 20a, 21a Flange part 22 First air jet pump (air supply mechanism) 22a, 23a Inlet ports 22b, 23b Exhaust Port 23 second air jet pump (empty 24 Body 24a Air chamber 24b Air ejection path 25 Air supply port 26 Nipple 27 Air hose 28 Coupling 29 Connecting member W Work material

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuo Arai 1511 Komagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Inside the Tsukuba Works, Mitsubishi Materials Corporation (72) Inventor Takefumi Hirose 1511 Furimagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture (56) References JP-A-3-79214 (JP, A) JP-A 62-106708 (JP, U) JP-A 53-25274 (JP, Y2) (58) Field (Int. Cl. ⁷ , DB name) B23Q 11/00

Claims (4)

(57) [Claims] 1. A cutting blade is provided at a predetermined interval on the outer peripheral side of a tip end of a tool body that rotates about an axis, and a rake of the cutting blade is provided.
A chip guide member is provided with a gap in the surface, and a substantially cylindrical chip storage body is provided on the outer periphery of the tool main body, and between the inner peripheral surface of the chip storage body and the tool main body. to form a chip discharging space cut into the cuttings is to retract and body first
A front surface provided with a chip discharging device having a through hole formed therein , for guiding chips generated by the cutting blade through the gap into a chip discharging space and discharging the chip from the first through hole;
In the milling machine , a second through hole is formed in the chip storage body at a position where chips in the chip discharge space are scattered by centrifugal force of a tool body, and the second through hole is formed in the second through hole. Air jet pump for blowing air from the hole into the chip discharge space
A face milling machine, wherein 2. The face mill according to claim 1, wherein one or a plurality of said second through holes and said air jet pump are provided. 3. The air jet pump has an intake port and an exhaust port, and the air on the intake port side is discharged from the exhaust port by the action of compressed air supplied from an air supply source. A face mill provided with the chip discharging device according to claim 1 or 2. 4. An air jet pump in place of the air jet pump.
An air supply for supplying compressed air is directly connected to the second through hole.
Face milling having a chip discharge device according to claim 1 or 2, wherein it has binding.