JP2547164Y2 - Milling tool with chip discharge mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling tool for performing profile cutting or the like using an end mill having a front cutting edge formed on an end face and a long outer cutting edge formed on an outer periphery.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show an example of this type of milling tool.
This will be described with reference to FIG. In the milling tool shown in these figures, an arbor 6 is attached to a main shaft 2 of a machine tool via a key 4, and an end of an end mill 8 is attached to the arbor 6 with bolts 10,
10 and is fastened and fixed. A plurality of front cutting edges 12 are formed on an end face of the end mill 8, and a plurality of long spiral outer cutting edges 14 are formed on the outer peripheral surface. Here, in this specification, “long” refers to the cutting edge length of the outer peripheral cutting edge with respect to the diameter d of the end mill (the length corresponding to L in FIGS. 8A and 8B). ) Is twice or more.

[0003] In the milling tool according to the above configuration, while the end mill 8 is rotated about the axis together with the main spindle 2, the end mill 8 is fed in a direction perpendicular to the axis to perform cutting such as copying of the work material C. Is going.

[0004]

In the conventional milling tool as described above, the generated chips are randomly scattered around the work material and around the machine. As a result, the working environment deteriorates.
In addition, there is a drawback that a considerable amount of time is required for chip processing after cutting is completed. Also, as the cutting is continued, the chips gradually accumulate on the work material and the table of the machine, etc., and the heat of these chips causes the work material and the machine to be thermally deformed, thereby deteriorating the processing accuracy, or There is also a disadvantage that chips are caught in the cutting blades 12 and 14 and the quality of the cutting surface is impaired. Furthermore, chips scattered around the machine may enter the sliding surface of the machine or the like, resulting in deterioration of accuracy of the machine itself or shortening of service life. As a milling tool with improved disadvantages, for example, Japanese Patent Application Laid-Open No.
As described in JP-A-109014, there is a face mill in which a cover is mounted on the outer peripheral side of an arbor of a face mill through a bearing. As another example, there is also known a machine tool in which a cover is attached to a non-rotating portion, as described in U.S. Pat. No. 2,944,465. However, these are not
Also because of the structure to place the cover by shifting the base end side of the tool so as not to cover the cutting edge, as of the end mill Re,
With a tool whose cutting edge extends relatively long in the axial direction and in the radial direction, it has been difficult to sufficiently discharge chips in a guided manner.

The present invention has been made under such a background, and an object of the present invention is to provide a milling tool capable of collecting chips generated by cutting without widely scattering around the machine. And Another purpose of this invention is
Even if it has a sharp cutting edge,
Can be collected without scattering widely around the machine
To provide a milling tool.

[0006]

According to the present invention, a cutting edge is provided on the outer periphery of the tip of the tool body, covers the outer peripheral surface of the tool body, and the opening of the tip is located in the region of the cutting edge of the tool body. A substantially cylindrical cover is provided, a chip storage chamber is formed between the inner peripheral surface of the cover and the outer peripheral surface of the tool body , and a discharge port for connecting the chip storage chamber to the outside is provided with a cover. In the milling tool with a chip discharge mechanism provided in the above, a notch portion is formed at the tip end of the cover so as to be slightly deeper than the cutting amount of the cutting blade with respect to the work material and through which the cut portion of the work material can pass. It is characterized by having. In addition, the present invention is directed to a cutting machine in which an end mill having a front cutting edge formed on an end face and a long outer cutting edge formed on an outer periphery is rotated around an axis and fed in a direction perpendicular to the axis to perform cutting. In the cutting tool, a cover that covers at least the peripheral surface of the end mill is provided outside the peripheral surface of the end mill, a chip discharge space is formed between the inner peripheral surface of the cover and the outer peripheral surface of the end mill, and the chip is formed on the cover. Forming a discharge opening for communicating the discharge space with the outside of the cover, forming a notch in the tip end portion of the cover to expose the tip end outer peripheral portion to the outside, and forming an outer periphery of the portion exposed from the notch; It is characterized in that cutting is performed by a cutting blade.

[0007]

In the milling tool according to the above configuration, the tool body
And send it in a direction perpendicular to the axis while linking around the axis,
Cut the work material passing through the notch of the cover with a cutting blade.
In particular, chips generated by the cutting blades are collected in the chip discharge space.
After being inserted, it is discharged from the outlet and collected. this
The gap between the cutting edge to be cut and the cover
Is not present, the chips generated by the cutting edge
From the minute, it is guided to the chip discharge space and discharged from the discharge port,
No chips are scattered outside the cover. Also, in the milling tool according to the present invention, the end mill is formed in the end outer peripheral portion of the end mill, which is sent out in a direction perpendicular to the axis while the end mill is wired around the axis and is exposed outward from the notch of the cover. The work material is cut by the blade and the front cutting edge. Chips mainly generated by the outer peripheral cutting edge are taken into the chip discharge space, and then discharged from the discharge port and collected. At this time, cut the cover on both sides of the exposed outer peripheral cutting edge.
The outer peripheral cutting edge to be cut and the
Is there more clearance than necessary between the face cutting blade and the cover?
Chips generated by the outer peripheral cutting edge
It is guided to the chip discharge space and discharged from the discharge port,
There is no scattering outside the cover.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same components as those of the above-described conventional example are denoted by the same reference numerals, and description thereof will be omitted. In these figures, reference numeral 16 denotes a radial bearing fitted into the arbor 6 and is locked in the axial direction by a retaining ring 18. A substantially funnel-shaped cover 20 that covers the outer periphery of the end mill 8 is fitted into the outer ring of the radial bearing 16, and the cover 20 is connected to the cap 22 and the bolt 24 so that it can rotate relative to the arbor 6. It is supported by.

The end position of the cover 20 in the axial direction is substantially the same as the end position of the end mill 8, and a substantially rectangular notch 2 is formed in the end portion of the cover 20.
6 are formed. The width W of the notch 26 is formed slightly larger than the diameter d of the end mill 8, and the cut depth h in the axial direction is formed slightly larger than the cut depth m of the end mill 8.

A circular cut hole 28 is formed in a portion of the front end side of the cover 20 which is substantially opposed to the notch 26.
Is formed, and a pipe 30 is inserted into the cutout hole 28 to form a suction port 32.

A chip discharge space 34 is formed between the inner peripheral surface of the cover 20 and the outer peripheral surface of the end mill 8. End mill 8 forming this chip discharge space 34
The gap amount δ between the outer peripheral portion and the cover 20 is appropriately determined according to the material of the work material, cutting conditions, and the like, but is desirably set within a range of 1 mm to 10 mm. If the gap amount δ is less than 1 mm, chips caught in the upper part of the chip discharge space 34 may accumulate in the upper part of the chip discharge space 34 and clog, thereby damaging the end mill 8 and the cover 20. If the gap amount δ exceeds 10 mm, the chip suction force, which will be described later, is reduced, and there is a possibility that the chip processing is hindered. A base end portion of the chip discharge space 34 is separated from the radial bearing 16 by a partition wall 36.

The tip end of a hose 38 connected to a chip suction device (not shown) provided outside the peripheral surface of the cover 20 is fitted into the suction port 32, and thereby the chip discharge space 34 and the chip discharge space 34 are connected. The chip suction device is in communication.

In the milling tool configured as described above, while the air inside the cover 20 is sucked from the suction port 32 by the chip suction device, the end mill 8 is rotated around the axis by the main shaft 2 while being perpendicular to the axis. Then, the workpiece C is cut by the outer peripheral cutting edge 14 and the front cutting edge 12 of the end mill 8 exposed outward from the notch 26 of the cover 20.

Inside the chip discharge space 34, a hose 38 is provided.
As a result, a negative pressure is generated because air is sucked from the air, and the air taken in from the opening at the tip end of the cover 20 and the notch 26 is guided into the chip discharge space 34 and taken into the chip suction machine from the suction port 32. It is. For this reason, after the workpiece C is mainly cut by the outer peripheral cutting edge 14 of the end mill 8 and the generated chips are taken into the chip discharge space 34, the suction port 3 is formed.
From 2 it is led to a chip suction machine where it is collected.

Therefore, according to the milling tool according to the above configuration, the chips generated during cutting regardless of the shape of the work material C do not scatter around the tool, the working environment is improved, and the chip processing is required. Time is shortened, and furthermore, various problems associated with the scattering of chips are eliminated, such as deterioration of mechanical accuracy due to accumulation of chips and deterioration of the quality of the machined surface of the work material C. It has excellent effects.

FIGS. 1 and 4 show a state in which the cutting tool is fed in the direction of arrow A in FIG. 2 (the direction of arrow B in FIG. 4) to cut the side surface of the work material C. Arrow D in FIG.
The rotation direction of the end mill 8 is shown. In the embodiment shown in these figures, the cover 20 is not restrained by the hose 38 and is in a state of being rotatable around the axis.
Then, in a state where one end 26a of the notch 26 of the cover 20 is in contact with the surface of the work material C (the surface E in FIG. 4), the end mill 8 is fed in the direction of arrow B while rotating in the above-described direction. Then, the cover 20 is always urged in the direction of arrow F in FIG. 4 due to the rotational frictional resistance of the radial bearing 16, and the contact between the surface E and one end 26 a of the notch 26 is always continued during the cutting. . However, in order to perform the above cutting, the width W of the notch 26 needs to be formed according to the cutting width n. Further, when the cutting width is constant in the entire cutting process, the rotation of the cover 20 may be stopped.

As a modification of the above embodiment, the cover 20 in FIG. 1 may be shaped to cover the end of the end mill 8 like the cover 40 in FIG. By forming the cover in such a shape, the degree of sealing of the cover is increased, the negative pressure in the chip discharge space 34 is further increased, and the chip suction effect can be further enhanced.

In the above embodiment, a straight end mill is used as the end mill. However, if the end mill has a front cutting edge formed on the end face and a long outer cutting edge formed on the outer periphery, a taper end mill is used. Of course, there may be.

The end mill used in the present invention is not limited to a solid end mill in which the cutting edge is integrally formed, but is a throw-away type end mill in which a throw-away tip having a cutting edge is detachably attached. You may.

[0020]

[Effect of the Invention] As described above, according to the invention , the cutting edge is cut into the work material at the tip of the cover.
Notch part that is slightly deeper than the amount and allows the cut part of the work material to pass through
Is formed, so even if there is a depth of cut,
Does not have an unnecessary gap between the cutting blade and the cover,
In addition, chips generated by the cutting blade are cut from the notch on the cover.
The waste is reliably guided into the waste discharge space, discharged from the discharge port, and
Debris does not scatter outside the cover. According to the invention, a cover that covers at least the peripheral surface of the end mill is provided outside the peripheral surface of the end mill, and a chip discharge space is formed between the inner peripheral surface of the cover and the outer peripheral surface of the end mill. , Mosquito
Discharge that communicates the chip discharge space with the bar and the outside of the cover
Form a mouth and attach the end of the end mill to the tip of the cover.
Forming a notch for exposing the outer peripheral portion to the outside,
So that cutting is performed with the outer peripheral cutting edge exposed from
Therefore, the chips generated by cutting mainly from the notch of the long peripheral cutting edge of the end mill are guided to the chip discharge space in the cover from the notches one after another without being scattered around the machine. It can be collected from the discharge port, thereby shortening the chip processing time, improving the working environment, and preventing the deterioration of the mechanical accuracy, and can solve all the various problems associated with the scattering of chips.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a milling tool according to an embodiment of the present invention.

FIG. 2 is a view as seen from an arrow II in FIG. 1;

FIG. 3 is a view as seen from the direction of arrow III in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is an axial sectional view of a milling tool according to another embodiment of the present invention.

FIG. 6 is a side view of a conventional milling tool.

FIG. 7 is a view of the milling tool viewed from an arrow I direction.

FIG. 8 is an explanatory diagram of an end mill.

[Explanation of symbols]

 Reference Signs List 8 end mill 12 front cutting edge 14 outer peripheral cutting edge 20, 40 cover 26 notch 34 chip discharge space

Claims (2)

(57) [Scope of request for utility model registration] 1. A substantially cylindrical cover having a cutting edge provided on an outer peripheral portion of a tip end of a tool body and covering an outer peripheral surface of the tool body and an opening of the tip end located in a region of the cutting edge of the tool body. Is disposed, a chip storage chamber is formed between the inner peripheral surface of the cover and the outer peripheral surface of the tool body , and a discharge port for connecting the chip storage chamber to the outside is provided in the cover. In the milling tool with a chip discharging mechanism, a notch portion is formed at a tip portion of the cover, which is slightly deeper than a cutting amount of the cutting blade with respect to the work material and through which a cut portion of the work material can pass. A milling tool with a chip discharge mechanism. 2. An end mill having a front cutting edge formed on an end face and an elongated outer cutting edge formed on an outer periphery thereof, while turning the end mill around an axis and feeding the end mill in a direction perpendicular to the axis to perform cutting. In the tool, a cover that covers at least the peripheral surface of the end mill is provided outside the peripheral surface of the end mill, and a chip discharge space is formed between an inner peripheral surface of the cover and an outer peripheral surface of the end mill,
The cover is provided with a discharge port for communicating the chip discharge space with the outside of the cover, and a notch is formed in a front end portion of the cover so as to expose a front end outer peripheral portion of the end mill outward. A milling tool with a chip discharge mechanism, wherein cutting is performed by the outer peripheral cutting blade in a portion exposed from the notch.