JP2780707B2 - Chip discharge mechanism for milling tools - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool for a rolling tool mainly used for plane machining of a work material such as a face mill.
It relates to a waste discharging mechanism . 2. Description of the Related Art Conventionally, various types of tools have been proposed as milling tools used for performing plane machining on a work material. Among them, a face milling tool has a low cutting resistance. It is the most commonly used because it is suitable for high-power cutting. The front milling tool includes a cutter body that is rotated around its axis, a front cutting edge provided on a distal end surface of the cutter body, and an outer peripheral cutting blade provided on a distal end portion of the outer peripheral surface of the cutter main body. Tool. These cutting blades are generally made of carbide,
Most of the mounting methods are of a throw-away type in which a carbide tip provided with each of the cutting blades is detachably fixed, and hereinafter, as a conventional face milling tool, a throw-away type face milling tool will be described below. An example will be described with reference to FIGS. In FIGS. 5 to 7, reference numeral 1 denotes a cutter body. The cutter body 1 is a cylindrical body having a small-diameter portion at one end as shown in FIGS. 5 and 6. 2 are formed at equal intervals along the circumferential direction. In the tip mounting groove 2, a throw-away tip (hereinafter, abbreviated as a tip) 3 is fitted with a wedge member 4 and a clamp screw 5.
By pressing against one wall surface of the chip mounting groove 2 by a clamp mechanism 6 comprising: As shown in FIG. 5, the tip 3 is made of a cemented carbide plate having a substantially square shape in plan view. When the tip 3 is fixed at a predetermined position of the tip mounting groove 2, the tip 3 protrudes from the tip end surface of the cutter body 1. Front cutting edge 3a
However, an outer peripheral cutting edge 3b is provided on one side protruding from the distal end of the outer peripheral surface of the cutter body 1. As shown in FIGS. 6 and 7, the tip of the cutter main body 1 in the rotational direction of the tip 3 is open to the tip of the cutter main body 1 and radially outward, and has an arc-shaped wall surface. A pocket 7 is provided. The tip pocket 7 is for sequentially inducing and discharging chips generated by the respective cutting blades 3a and 3b to the outside of the cutter body 1, and the work material is a continuous flow type such as mild steel. If it is made of a material that easily generates chips, it also has a role of rounding and cutting continuously generated chips. On the other hand, the small-diameter side of the cutter body 1 is integrally fixed to the arbor 8 and the detent key 9. That is, the shaft 8 of the arbor 8
a mounting hole 10 at the center of the cutter body 1 on the small diameter side;
Are fitted, and the fastening bolt 11 is screwed into the end face of the shaft portion 8b of the arbor 8 from the end face on the large-diameter side, whereby the arbor 8 is integrally fixed coaxially. On the opposite side of the shaft portion 8a of the arbor 8, a tapered shank 8b for fitting with a tapered hole 12a of a machine tool spindle (hereinafter, abbreviated as the spindle) is provided. Is formed with a female screw (not shown). The female thread portion pulls up the arbor 8 in the axial direction of the main shaft 12 by a drawing bolt (not shown) in the main shaft 12 so that the face mill and the main shaft 1
2 for firmly bonding the two. [0005] The plane machining of the work material W using the face milling tool having the above configuration is performed in the following procedure. As shown in FIG. 5, first, the tapered shank 8b of the arbor 8 is fitted into the tapered hole 12a of the main shaft 12, and the arbor 8 is connected to the main shaft 12 with a drawing bolt.
, And the arbor 8 is fixed to the main shaft 12 via the main shaft key 13, and the face mill is
Attach to Next, the work surface of the work material W is
2 is fixed on a machine table (not shown) so as to be orthogonal to the axis. Then, the main shaft 12 is rotated around its axis, and the main shaft 12 or the machine table is moved in the axial direction of the main shaft 12 to give a predetermined cut on the surface of the work material W,
The spindle 12 or the machine table is moved in a direction orthogonal to the axis of the spindle 12. Then, the front surface cutting edge 3a and the outer peripheral cutting edge 3b cut the surface of the work material W one after another, and are subjected to plane processing. When plane machining is performed using the above-described conventional face milling tool, chips generated by the respective cutting edges 3a and 3b are divided by the tip pockets 7 and sequentially out of the cutter body 1. Emissions have been a problem for the following reasons: First, chips discharged to the outside of the cutter body 1 randomly scatter on the surface of the workpiece W, on the machine, or around the machine. This not only deteriorates the working environment, but also sometimes causes the scattered chips to enter the sliding surface or the like of the machine main body, thereby lowering the accuracy and life of the machine. Further, when chips are deposited on the surface of the workpiece W, the cutting edges 3a and 3b may bite the chips, which may cause chipping of the cutting edges and deterioration of the machined surface. Furthermore, these chips are usually heated to high temperatures,
Chips deposited on the surface of the work material W or on the machine serve as a heat source, causing thermal deformation of the work material W or the machine, leading to a reduction in machining accuracy. In order to solve such a problem, there has been proposed a chip discharge mechanism for a milling tool in which a cover is attached to an outer periphery of a cutter body to suck chips.
One example is U.S. Pat. No. 2,944,465 (196).
0). In this chip discharge mechanism, a cylindrical case covering the outer periphery of the cutter body is attached to a non-rotating part of the machine tool, a vane for scraping chips generated by the cutting blade is provided on the tip end surface of the cutter body, and a cylindrical case is provided. A suction mechanism is connected to the outlet. And at the time of rotary cutting of the work material by this tool, chips generated by the cutting blade are collected on the processing surface by the vane,
It is sucked into the cylindrical cover by the suction force of the suction mechanism and discharged from the outlet. [0010] However, in the above-described chip discharging mechanism, since there is a considerable distance between the cutting blade and the cylindrical case, there is a disadvantage that chips are scattered around. . Even if this is scraped with a vane, it is not guided sufficiently into the cylindrical case and cannot be sucked, and the vane is severely worn, and the gap between the tip opening of the cylindrical case and the cutter body is large and There is also a drawback that even if the suction force of the suction mechanism is increased, a sufficient suction function for guiding and reliably sucking the chips cannot be exerted since the entire circumference of the cutter body is increased. The present invention has been made in view of the above circumstances, and has been made to enable a chip generated by a cutting blade to be reliably guided and collected without being scattered around a machined surface of a work material or around a machine. An object of the present invention is to provide a chip discharge mechanism for a milling tool. [0011] In order to solve the above-mentioned problems , the present invention provides a cutter which can be rotated about an axis.
The outer peripheral cutting edge and the front cutting edge are provided on the outer peripheral part of the tip of the main body.
While covering the outer periphery of the cutter body and
A substantially cylindrical shape with its tip opening on the tip side of the cutter body
A chip storage body is provided, and an inner peripheral surface of the chip storage body
A chip discharge space is formed between the cutter body and the outer peripheral surface.
The chip outlet has a discharge port that communicates with the chip discharge space.
In the provided chip discharge mechanism of the milling tool,
Chips generated by the peripheral cutting edge or the front cutting edge
The chip guide for guiding to the discharge space is
On the rake face of the cutting edge on the front side and the chip guide
Slightly retracted to the proximal end from the face side cutting edge and the outer periphery
Slightly retracted to the axial side from the turning diameter of the side cutting edge
It is characterized by. In the milling tool with the above configuration, the work material
When performing flat processing on the surface, the outer peripheral side cutting edge or the front side cutting edge
The chips generated by the chip are guided to the chip guide
Forcefully guided into the chip discharge space,
Rotated by centrifugal force due to rotation, discharged from outlet and collected
It is. Also, the cutter can be rotated around the axis
-While the cutting edge is provided on the outer periphery of the tip of the main body,
The outer surface of the cutter body is covered and the tip is
A substantially cylindrical chip storage body that opens at the tip side of the main body is provided.
The inner peripheral surface of this chip storage body and the outer peripheral surface of the cutter body
A chip discharge space is formed between the
Milling with a discharge port communicating with the chip discharge space
Chips generated by the cutting blade in the tool chip discharge mechanism
The chip guide for guiding the air into the chip discharge space is a cutting edge
On the rake face, and the tip of the chip storage
It is characterized by being located in an internal area. Cut chips
Discharge of chips in the chip storage via the chip guide
Guided to space. [0012] The present invention also provides a rotating apparatus that rotates about an axis.
Insert the outer peripheral cutting edge into the outer periphery of the tip of the cutter body
The cutting edge is provided on the surface of the cutter body.
Cover the outside of the surface and open the tip to the tip side of the cutter body.
A substantially cylindrical chip storage body is provided.
Chip discharge between the inner peripheral surface of the package and the outer peripheral surface of the cutter body
A discharge space is formed and connected to the chip discharge space
A discharge port is provided to allow the
Creates an airflow to discharge chips through
In the chip discharge mechanism of the milling tool to which means are added
To remove the chips generated by the outer cutting edge or the front cutting edge.
The chip guide for guiding to the chip discharge space is on the outer peripheral side
Provided on the rake face of the cutting edge and front side cutting edge,
Part is slightly retracted to the proximal side from the front side cutting edge.
Slightly retreating toward the axis from the turning diameter of the outer cutting edge
It is characterized by that. According to the above configuration, the cutting blade
The generated chips create an airflow with the chip guide
Induced suction into the chip discharge space sequentially due to the synergistic effect with the means
The centrifugal force acting on the chips and the airflow
Is reliably collected. Also, the tip of the chip storage
It may be located in the area of the waste guide. An embodiment of the present invention will be described below with reference to FIGS. In each drawing, the same components as those in FIGS. 5 to 7 are denoted by the same reference numerals, and description thereof will be simplified. 1 to FIG.
Is a cutter body. The cutter body 1 is a cylindrical body having a small-diameter portion extended in the distal direction more than the conventional face milling tool, and has a tip mounted on the outer periphery of the distal end similarly to the conventional face milling tool. Groove 2
And a number of chip pockets 7 are formed along the circumferential direction,
Further, a chip 3 having a front cutting edge 3a and an outer peripheral cutting edge 3b is provided in the chip mounting groove 2 by a clamp mechanism 6 including a wedge member 4 and a clamp screw 5, similarly to the conventional face milling machine. It is detachably fixed to the position. Further, in the face milling tool of the present embodiment, the chips generated by the respective cutting blades 3a and 3b are guided to the chip discharge space described later on the tip end surface of the cutter body 1. The chip guide member 14 of
The surface is slightly recessed in the axial direction from the front cutting edge 3a, and is embedded. As shown in FIG. 4, this chip guide member 14 has the same number of hook-shaped pieces 14a (chip
(Inside) is a plate material formed at equal intervals in the circumferential direction, and its outer diameter is set slightly smaller than the turning diameter of the outer peripheral cutting edge 3b, and when fixed to the tip end surface of the cutter body 1, As shown in FIGS. 1 and 2, the outer peripheral surface of the hook-shaped piece 14 a is located slightly retreated from the outer peripheral cutting edge 3 b of the tip 3 to the inside of the cutter body 1 in the radial direction. When the hook-shaped piece 14a is fixed to the cutter body 1, as shown in FIGS. 2 and 3, the hook-shaped piece 14a covers the chip pocket 7, closes the chip discharge space described later, and bends in the bending direction. A small gap is formed between the tip surface 14b of the tip 3 and the rake face of the tip 3, and the chips peeled off from the surface of the work material by the respective cutting blades 3a and 3b are guided to the tip pocket 7. Thus, its shape is determined. As shown in FIG. 3 and FIG. 4, the tip of the hook-shaped piece 14a is
and a groove 14c opened toward the mounting surface of the chip guide member 14 is formed between the rake face of the tip 3 and the bending end face 14b of the hook-shaped piece 14a. The inside of the gap is enlarged to prevent clogging of chips passing through the gap. On the other hand, as shown in FIG. 1, the cutter body 1 has a mounting hole 10 fitted in a shaft portion 8a of an arbor 8 and a tightening bolt 11 from the large-diameter end face, similarly to the conventional face milling tool. Is screwed into the end face of the shaft portion 8b of the arbor 8, thereby being coaxially and integrally fixed via the arbor 8 and the detent key 9. On the opposite side of the shaft portion 8a of the arbor 8, a tapered shank 8b for fitting with the tapered hole 12a of the main shaft 12 is provided.
Further, at the end of the tapered shank 8b, a female screw portion for firmly connecting the face milling tool and the main shaft 12 with a drawing bolt (not shown) in the main shaft 12, which is not shown, is formed. . Further, a large diameter shaft 8c is formed at the rear end of the shaft 8a of the arbor 8, and the large diameter shaft 8c has a retaining ring 1c.
6, the bearing 17 is fixed, and a chip storage body 18 is fitted on the outer ring of the bearing 17. The chip storage body 18 is integrally connected to a cover 19 fitted on the outer ring of the bearing 17 from the opposite side by bolts 20, and is rotatable coaxially with the cutter body 1. As shown in FIGS. 1 and 2, the chip storage body 18 includes the cutter body 1 and the outer peripheral cutting blade 3b.
A thin hollow cylindrical body covering the inner diameter of the inner peripheral surface,
The chip discharge space 21 having a size large enough to store the chips separated by the chip pocket 7 is formed between the cutter body 1 and the outer peripheral surface of the small diameter portion. The inner peripheral surface in the vicinity of the bearing 17 is narrowed so as to be slightly larger than the small diameter portion of the cutter body 1, so that the sealing performance of the chip discharge space 21 is improved and a dustproof effect on the bearing 17 is generated. Let me. The tip surface of the chip storage body 18
The outer peripheral cutting edge 3b of the tip 3 is a position slightly retreated in the axial direction from a portion cut into the work material,
The inner peripheral surface of this tip portion is narrowed to a degree slightly larger than the turning diameter of the outer peripheral cutting edge 3b. On the other hand, on the outer peripheral surface of the chip storage body 18, the chip discharge space 21 is provided.
Suction mechanism 22 (of resulting air flow sucking chip-removing internal
Means for connecting ) . That is, the suction device connecting pipe 23 is fitted into the through hole 18a formed on the outer peripheral surface of the chip storage body 18, and the suction device connecting pipe 23
One end of the duct hose 24 is fitted into the swarf, and the other end is connected to a suction machine (not shown) to
Thus, the chips inside 1 can be sequentially sucked. The plane machining of the workpiece W using the face milling tool having the above configuration is performed in the following procedure. First, as shown in FIG. 1, the tapered shank 8b of the arbor 8 is fitted into the tapered hole 12a of the main shaft 12, and the arbor 8 is connected to the main shaft 1 with a drawing bolt.
The arbor 8 is fixed to the main shaft 12 via the main shaft key 13, and the face milling tool is mounted on the main shaft 12. Next, the work material W is fixed on a machine table (not shown) such that the work surface thereof is orthogonal to the axis of the main shaft 12. Then, the main shaft 12 is rotated around its axis, the main shaft 12 or the machine table is moved in the axial direction of the main shaft 12 to give a predetermined cut to the surface of the work W, and the main shaft 12 is operated while operating a suction machine (not shown). Alternatively, the machine table is moved in a direction orthogonal to the axis of the main shaft 12. Then, the chips peeled off from the surface of the work material W by the front cutting edge 3a are separated from the surface side of the chip guide member 14 by the rake face of the chip 3 and the end face of the hook-shaped piece 14a of the chip guide member 14. Is discharged into the chip pocket 7 and is divided. In addition, the outer peripheral cutting edge 3b
The chips peeled off from the surface of the work material W are guided from the outer peripheral side of the chip guide member 14 to the gap between the rake face of the chip 3 and the end face of the hook-shaped piece 14a of the chip guide member 14, It is discharged into the chip pocket 7 and divided.
Then, to come new chips are discharged one after another in the chip pocket 7, shed chips are pushed chip discharge space 21, the through hole 18a, a suction device connected pipes 2 3 and the duct hose The liquid is sucked into the suction machine via 24 and collected. As described above, in the face milling tool of the present embodiment, the chips generated by the respective cutting edges 3a and 3b during machining are processed by the chip guide members 14 via the chip pockets 7 and the chips. The suction mechanism 22 guided to the discharge space 21 and connected to the chip storage unit 18 sequentially sucks and discharges the chip storage unit 18 outside, so that
Chips do not accumulate on the surface of the work material W and do not scatter on or around the machine. Therefore, there is no occurrence of cutting edge loss or deterioration of the machined surface at the time of machining, there is no fear of deterioration in accuracy due to thermal deformation of the work material W or the machine, and no decrease in machine accuracy or life due to intrusion of chips can occur. . Moreover, the chip guide member
14 covers the chip pocket 7 and the chip guide member 14
And the rake face of each of the cutting blades 3a, 3b
Since a gap for guiding is formed, the suction mechanism 22
In addition to the increased suction power of the chips, the generated chips
Is quickly and reliably guided into the chip discharge space 21 from the gap.
Compared to this type of chip ejection mechanism
As a result, the chip's suction and discharge characteristics have been significantly improved . In this embodiment, the throw-away type face milling tool has been described, but the rolling tool of the present invention is not limited to this, and is an integral type in which a carbide tip is brazed to the cutter body. Applicable to face milling tools and shell end mills.
It is most preferable that the position of the suction device connecting pipe 23 of the chip storage body 18 be a position where chips generated by the respective cutting blades 3a and 3b are scattered by the centrifugal force of the cutter body 1. Chips fly by the centrifugal force of the cutter body 1
At the same time the airflow due to the rotation of the cutter body is the same
And the chips are discharged in the chip storage body 18
To be transported in the space 21 to promote discharge.
And Further, the number of the chips is not limited to one, and if provided at a plurality of places, the chip suction effect can be further enhanced. As described above, the milling according to the present invention is performed.
According to the tool chip discharge mechanism, the outer peripheral side cutting edge and the front side
Guides chips to the chip discharge space on the rake face of the cutting blade
Since the chip guide is provided for
Or the chips generated by the front cutting edge
Guided into the chip discharge space quickly and reliably by the interior
It can be sequentially discharged from the outlet and collected. So
Chips on the workpiece surface, on the machine, or around the machine
Work environment is degraded because it does not spatter randomly
And reduce the accuracy and life of the machine.
There is no. Also, chips do not accumulate on the surface of the work material.
The cutting edge is damaged or cut due to biting of the cutting edge.
There is no risk of surface deterioration, and chips are a heat source.
Work material and machine can not be thermally deformed, maintaining machining accuracy
Can do it. In addition, the milling tool according to the present invention
According to the chip discharge mechanism, the tip of the chip storage
Because it is located in the area of the guide, it is surely in the chip discharge space
The chips can be guided and discharged. In addition, the transfer according to the present invention.
According to the chip discharge mechanism of the cutting tool, from the chip discharge space
Create an airflow to discharge chips to the outside through the discharge port
Mill discharger with milling means
On the rake face of the outer cutting edge and the front cutting edge.
A chip guide for guiding chips into the chip discharge space
From the chip discharge space by airflow
The suction force acting near the cutting edge is high, and chips are quickly and reliably
Indeed, it is guided inside the chip discharge space and outside the chip storage
It can be discharged sequentially . Therefore, this kind of conventional
Dramatic chip suction and discharge characteristics compared to chip discharge mechanism
Can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a tool showing an embodiment of the present invention. FIG. 2 is a bottom view of the tool shown in FIG. FIG. 3 is an enlarged view of a tool edge portion. FIG. 4 is a plan view of a chip guide member. FIG. 5 is a sectional view showing an example of a conventional milling tool. 6 is a bottom view of the tool shown in FIG. FIG. 7 is an enlarged view of a tool edge portion. [Description of Signs] 1 ... Cutter body, 3a ... Front cutting blade, 3b ... Outer peripheral cutting blade, 8 ... Arbor, 12 ... Machine spindle, 14 ... Chip guide member, 18 ... Chip storage Body, 21: chip discharge space, 22: suction mechanism.

Claims (1)

(57) [Claims] Of the cutter body that can be rotated about the axis
The outer peripheral side cutting edge and the front side cutting edge are provided at the tip outer peripheral part.
Along with covering the outer peripheral surface of the cutter body and
A substantially cylindrical cut end with an opening on the tip side of the cutter body
A chip storage body is provided, and an inner peripheral surface and an upper surface of the chip storage body are provided.
A chip discharge space is formed between the cutter body and the outer peripheral surface.
And the chip storage body is connected to a chip discharge space.
In the chip discharge mechanism of the milling tool with an exit
To remove the chips generated by the outer peripheral cutting edge or the front cutting edge.
The chip guide for guiding to the chip discharge space is up
It is installed on the rake face of the outer peripheral side cutting edge and the front side cutting edge.
The chip guide is slightly closer to the base end than the front cutting edge.
It is retracted and the axis line side from the turning diameter of the outer cutting edge.
Milling tool cutting characterized by a slight retreat
Waste discharging mechanism. 2. Of the cutter body that can be rotated about the axis
A cutting edge is provided on the outer periphery of the tip,
The outer surface of the outer surface of the
A substantially cylindrical chip storage body that opens at the tip side of the main body is provided.
And the inner peripheral surface of the chip storage
A chip discharge space is formed between the chip and the peripheral surface.
The container has a discharge port that communicates with the chip discharge space.
In the chip discharge mechanism of a milling tool, chips generated by the cutting blade are guided to the chip discharge space.
A chip guide for guiding is provided on the rake face of the cutting blade.
The tip of the chip storage body is located in the area of the chip guide.
Cutter for milling tools, characterized by being located in the area
Structure. 3. Of the cutter body that can be rotated about the axis
The outer peripheral side cutting edge and the front side cutting edge are provided at the tip outer peripheral part.
Along with covering the outer peripheral surface of the cutter body and
A substantially cylindrical cut end with an opening on the tip side of the cutter body
A chip storage body is provided, and an inner peripheral surface and an upper surface of the chip storage body are provided.
A chip discharge space is formed between the cutter body and the outer peripheral surface.
And the chip storage body is connected to a chip discharge space.
An outlet is provided, and through the discharge port from the chip discharge space
Means for creating an airflow to exit discharge debris off the outside Te
In the chip discharge mechanism of a milling tool to which is added, the chips generated by the outer peripheral side cutting edge or the front side cutting edge are removed.
The chip guide for guiding to the chip discharge space is up
It is installed on the rake face of the outer peripheral side cutting edge and the front side cutting edge.
The chip guide is slightly closer to the base end than the front cutting edge.
It is retracted and the shaft is larger than the turning diameter of the outer peripheral side cutting blade.
Milling tool characterized by a slight retreat to the line side
Chip discharge mechanism. 4. The tip of the chip storage body is in the area of the chip guide.
4. The milling tool according to claim 3, wherein
Chip discharge mechanism.