JPH0744432Y2 - Rolling tool with chip suction mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a rolling tool with a chip suction mechanism provided with a chip suction mechanism for sucking and discharging chips generated by a cutting blade at the tip of a cutter body.

[Prior Art] Conventionally, for example, in a cutting tool such as a face milling machine, there is a problem that chips generated during cutting scatter around the tool as the tool rotates, thereby deteriorating the working environment.

As a device for improving such a problem, for example, as in U.S. Pat.No. 2944465, a chip suction cover that covers the outer periphery of the cutter body is fixed to a non-rotating portion of a machine tool, and the chips generated by the cutting blade are cut by the cutter. There is a chip suction device that suctions and discharges into the space between the main body and the cover. However, in this device, since the chip suction port between the cutter body and the tip of the cover and the cutting blade that generates chips are considerably separated from each other, the guidance and suction of the chips are insufficient, and the chips are scattered. Could not be sufficiently prevented.

Therefore, the applicant previously proposed a rolling tool equipped with a chip suction mechanism as a rolling tool capable of preventing chips from scattering by suctioning and collecting chips in parallel with the cutting of the work material.

For example, FIGS. 16 to 19 are disclosed in Japanese Patent Application No. 62-
It shows a face mill with a chip suction mechanism disclosed in No. 263508. The front milling cutter shown in these figures is detachably attached to the outer peripheral portion of the tip of the cutter body 1 with a plurality of cutting blade chips 2 with the cutting blades 3 and 4 protruding from the outer periphery of the tool and the tip. A base end portion of the arbor 5 is fitted to an arbor 5 mounted on a spindle S of a machine tool and fixed by a bolt 6, and a peripheral surface of the arbor 5 has a substantially cylindrical cover 7 that covers an outer peripheral surface of the cutter body 1. Is rotatably fitted through a bearing 8, and a chip storage chamber 9 between the outer peripheral surface of the cutter body 1 and the inner peripheral surface of the cover 7 is attached to the tip end surface of the cutter body 1.
A chip guide member 10 for covering the opening of is attached and configured roughly.

Here, the chip guide member 10 is formed by providing a chip guide portion 12 that extends radially outward on the outer periphery of an annular base portion 11, and an end surface 12a of each chip guide portion 12 and a cutting edge rake surface 2a. Between the cutting edge and the cutting edge, a fixed gap t for forcibly guiding the chips generated by the cutting blade in the direction away from the machined surface of the work material is positioned and attached to the cutter body 1. Further, a groove portion 13 opening toward the rake face 2a of the cutting edge chip 2 is formed in a portion of each chip guide portion 12 facing the chip storage chamber 9.

According to the face milling machine configured as described above, it is possible to collect chips generated by the cutting blades 3 and 4 of the cutting blade chip 2 during cutting without scattering around the tool. That is, the suction hose connected to the outlet 14 of the cover 7.
By sucking the air in the chip storage chamber 9 at 15, a negative pressure is generated in the chip storage chamber 9, and along with this, the chip guide member 10
The chips are sucked from the gap t between the cutting edge chip 2 and the rake face 2a of the cutting edge chip 2 and collected from the discharge port 14. In the figure, reference numerals K ₁ and K ₂ are keys for transmitting the rotation of the main shaft S to the cutter body 2.

The face milling machine shown in FIGS. 20 to 23 is disclosed by the applicant in Japanese Patent Application No. 1-54052. The front milling cutter shown in these figures has a chip guide portion 17 formed on a wedge member 16 for fixing the cutting edge chip 2,
The wedge member 16 itself is used as a chip guide member.

Here, the end face 17a of the chip guide portion 17 is similar to the chip guide member 10 shown in FIG. 16 described above and the cutting face rake face 2a so that a constant gap t is formed between the end face 17a and the cutting face rake face 2a. It is formed in a plane that is substantially parallel. Further, a groove portion 18 that opens toward the end surface 17a is formed on the side of the chip guide portion 17 that faces the chip storage chamber 9. Further, the outer peripheral side surface 17b of the chip guide portion 17 is formed in a flat shape, and various dimensions such as the inclination thereof are set within a range that does not protrude from the rotation locus of the cutting blade 3 when mounted on the cutter body 1.

[Problems to be Solved by the Invention] In the above-described conventional face milling machine with a chip suction mechanism, the tip of the cover 7 and The distance from the cutting edge 4 is determined, but if this distance is particularly large, that is, if the depth of cut in the tool axis direction is large, and the gap t is constant, the tool base is cut along the rake face 2a. Since the chips growing toward the end side have to pass through a narrow gap t in a certain section, there is a drawback that chip clogging easily occurs and normal cutting is hindered.

Here, in order to solve the above-mentioned drawbacks, it is conceivable to make the gap t uniform, for example. In such a case, however, the gap t exposed on the outer peripheral side of the tool is similarly enlarged, so that the chips are cut. However, there is a new drawback that the suction efficiency of is reduced.

The present invention has been made under such a background, and a chip suction mechanism capable of preventing the chip suction efficiency from decreasing and preventing clogging in the gap t to more reliably collect and collect chips. The purpose is to provide an integrated rolling tool.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention is directed to gradually cutting the end face of the chip guide member facing the rake face of the cutting edge chip from the tool tip side toward the base end side. It is formed so as to be separated from the rake face.

In this case, in order to prevent a decrease in the chip suction efficiency in the range where the depth of cut is relatively small, of the end face of the chip guide member facing the rake face of the cutting edge chip, on the part on the tool tip side, It is preferable to provide a flat portion that is substantially parallel to the rake face of the cutting edge chip.

Further, the chip storage body is provided with a movable cover, which is movable toward and away from the fixed cover in the axial direction of the cutter body, on the tip side of the fixed cover.

[Operation] According to the above configuration, the gap between the chip guide member and the rake face of the cutting blade tip is enlarged on the base end side in the tool axial direction covered by the cover, so that the decrease in the chip suction efficiency is minimized. It is possible to improve the chip discharge property in the above-mentioned gap while keeping the above.

If a flat portion is provided on the end surface of the chip guide member,
Even if the depth of cut changes within a relatively small range, the size of the gap exposed on the outer peripheral side of the tool is kept constant, so that the chip suction efficiency does not decrease.

By adjusting the tip position of the movable cover according to the change in the cutting depth of the cutting edge of the cutting blade tip, it is possible to effectively prevent a decrease in suction efficiency.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. The same components as those of the conventional example described above are designated by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 1 to 3, in the front milling cutter of this embodiment, a plurality of cutting edge chips 2 are attached to the outer peripheral portion of the tip of the cutter body 1 and are connected to the base end portion of the cutter body 1. A cover 20 having a substantially cylindrical shape is rotatably mounted on the arbor 5 via a bearing 8, and a discharge port 14 communicating with the chip storage chamber 9 is formed on the outer peripheral portion of the cover 20. A chip guide member 21 is attached to the tip end surface of the device to have a schematic structure.

Here, the cover 20 includes a fixed cover 20a that is rotatably attached to the arbor 5, and a movable cover 20b that is fitted to the fixed cover 20a and opens toward the tool tip side. In the same manner as the front milling cutter disclosed in Japanese Patent Application No. 1-16470, by moving the movable cover 20b in the tool axial direction along the long hole 20d in a state where the bolt 20c fixing the movable cover 20b is loosened, The position of the tip of the cover 20 can be adjusted according to the change in the cutting depth of the cutting blades 3 and 4 of the cutting blade chip 2.

Further, the chip guide member 21 is provided with a chip guide portion 24 extending outward in the tool radial direction on the outer periphery of an annular base portion 23.

Here, as shown in FIGS. 1 and 4 to 6,
On the side of the chip guide portion 24 facing the chip storage chamber 9, there is formed a projection 26 that fits into the chip pocket 25 of the cutter body 1. The inner peripheral side surface 27 of each of the protrusions 26 is formed into an arc surface that is in close contact with the wall surface 25a of the chip pocket 25, and the outer peripheral side surface 28 is formed into an arc surface that is continuous with the outer peripheral surface of the cutter body 1. .

Further, the protrusion 26 is provided with a groove portion 30 that opens to an end surface 29 that faces the rake surface 2a of the cutting edge chip 2. This groove
Reference numeral 30 is for smoothly discharging the chips passing through the gap t between the end surface 29 and the rake face 2a toward the chip storage chamber 9. The end surface 29 of the chip guide member 21 is
It is formed in a plane orthogonal to the surface 31 of the chip guide member 21.

The chip guide member 21 formed in this way is used in the cutter body 1
Is attached to the tip end portion of the cutter body 1 so as to be substantially flush with the tip end face of, and is tightened with a bolt 33 to be integrated with the cutter body 1. Here, the end face 29 is formed so as to be inclined in a specific direction with respect to the rake face 2a of the cutting edge chip 2 which is inclined at a predetermined axial rake angle α with respect to the tool axis direction, and accordingly, the end face 29 is formed. The gap t between the rake face 2a and the rake face 2a gradually increases from the tool tip side toward the base end side. The inclination angle of the end face 29 does not necessarily have to match the rake angle α of the rake face 2a,
It is preferable to set it in the range of 5 ° to 30 ° with respect to the tool axis line as much as possible. The value of the clearance t is 0.5 mm at the tool tip side, that is, the position where the clearance t is the smallest.
A range of 2.0 mm is suitable.

Then, in the front milling cutter having the above configuration, as in the above-described conventional front milling cutter, by connecting the suction hose 15 to the discharge port 14 of the cover 7 and sucking the air in the chip storage chamber 9, The chips generated by the cutting blades 3 and 4 can be sequentially sucked and recovered from the gap t between the end surface 29 of the chip guide plate 21 and the cutting blade rake surface 2a.

Here, according to the present embodiment, since the gap t between the side surface 29 of the chip guide member 21 and the rake face 2a becomes wider from the tool tip side toward the base end side, the discharge of chips passing through the gap t The improved properties prevent chip clogging. Moreover, the gap t
Since the larger side of the tool is almost covered by the tip of the cover 20 and is not exposed to the outer peripheral side of the tool, the reduction of the chip suction effect can be minimized.

In the present embodiment, the throwaway type face milling machine has been described as an example, but the present invention is not limited to this, and can be applied to a face milling machine to which a cutting edge chip is brazed and various other cutting tools. is there.

Also, in the present embodiment, the gap t is particularly uniformly enlarged from the tool tip side toward the base end side, but the present invention is not limited to this, and for example, as shown in FIG. A flat portion 34, which is substantially parallel to the rake face 2a, may be provided at a portion of the end face 29 of the member 21 facing the tip side of the cutting edge chip 2. In this case, the size of the gap t exposed on the outer peripheral side of the tool does not change as long as the tip position of the cover 20 is adjusted in the vertical direction in a range where the cutting amounts of the cutting blades 3 and 4 are relatively small. It is possible to completely prevent a decrease in the chip suction efficiency when the cutting depth is small. The length of the flat portion 34 in this case may be appropriately changed according to the cutting depth of the cutting blades 3 and 4, but generally a range of about 1 mm to 3 mm is preferable.

Further, especially in this embodiment, the chip guide member 21 is integrally formed by the annular base portion 23, but the present invention is not limited to this. For example, as shown in FIG. It may be integrated with the wedge member 40 for fixing the. In this case, as shown in FIGS. 8 to 11, a chip guide member 41 is integrally formed on one end side of the wedge member 40, and an end face 42 of the chip guide member 41 is formed on the rake face 2a of the cutting blade chip 2. It may be an inclined surface that is inclined with respect to.

When the chip guide member 41 is integrated with the wedge member 40 as described above, the chip guide member 41 is fixed to the wedge member 40 by the bolts 44 as shown in FIGS. 12 to 14. Of course, it does not matter.

Also in these examples, it is naturally possible to provide the flat portion 45 on a part of the end face 42 as in the modification shown in FIG. 8 described above (see FIG. 15).

In FIGS. 8 to 15, reference numeral 46 is a groove portion for improving the dischargeability of the chips passing through the gap t, and 47 is a wedge member.
The outer peripheral side surface of 40 forms a circular arc surface which is continuous with the wall surface 25 a of the chip pocket 25 of the cutter body 1. Further, 48 is a wedge member 40.
Is a bolt for attaching to the cutter body 1, and 489 is a bolt hole into which the bolt 48 is inserted.

Further, in each of the above-described embodiments and modifications, the gap t is enlarged by making the end surfaces 29 and 42 of the chip guide members 21 and 41 into inclined surfaces, but the present invention is not limited to this, and arcs are not limited thereto. Various modifications are possible, such as a surface, an inclined surface whose angle changes in multiple steps, or a surface which is separated from the rake surface 2a in steps.

[Effects of the Invention] As described above, according to the present invention, the gap between the chip guide member and the rake face of the cutting edge chip expands on the base end side in the tool axial direction covered by the tip end of the cover. Therefore, there is an effect that the chip discharging efficiency in the gap is improved and the chips can be sucked more reliably while the deterioration of the chip suction efficiency is minimized.

If a flat portion is provided on the end surface of the chip guide member,
Even if the depth of cut changes within a relatively small range, the size of the gap exposed on the outer peripheral side of the tool is kept constant, so that an excellent effect that the chip suction efficiency does not decrease is achieved.

Further, since the chip storage body is provided with a movable cover that can move forward and backward on the tip side of the fixed cover, by covering the gap on the base side with the movable cover according to the cutting amount of the cutting blade, the chip suction efficiency can be improved. It can be held well.

[Brief description of drawings]

1 to 6 are views showing an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is an axial sectional view, FIG. 3 is a front view, and FIG. 4 is in FIG. 5 is a view from the direction I in FIG. 5, FIG. 5 is a view from the direction II in FIG. 4, and FIG. 6 is a view III in FIG.
FIG. 7 is a view showing a modified example of the embodiment shown in FIGS. 1 to 6, and FIGS. 8 to 11 are views showing another embodiment of the present invention.
8 is a side view, FIG. 9 is a view from the direction IV in FIG. 8, FIG. 10 is a view from the direction V in FIG. 9, and FIG. 11 is a view from FIG. FIG. 12 to FIG. 14 are views showing a modified example of the above-mentioned other embodiment, FIG. 12 is a front view of the chip guiding member, and FIG. 13 is a VII in FIG. Arrow view from the direction, FIG. 14 is a view from the VIII direction in FIG. 13, FIG. 15 is a diagram showing a further modified example of the other embodiment shown in FIGS. 8 to 11, 16 to 19 are views showing a conventional example, FIG. 16 is an axial sectional view, FIG. 17 is a front view, FIG. 18 is a view from the direction of IX in FIG. 16, and FIG. 20 is an enlarged view of the tip of a chip guide member, FIGS. 20 to 23 are views showing another conventional example, FIG. 20 is an axial sectional view, FIG. 21 is a front view, and FIG. 22 is FIG. X inside
FIG. 23 is a view from the direction of arrow, and FIG. 23 is a view from the direction of XI in FIG. 1 ... Cutter body, 2 ... Cutting edge chip, 2a ... Rake face, 3.4 ... Cutting edge, 9 ... Chip storage chamber, 14 ... Discharge port, 20 ... Cover, 21.41 ... Chip guide member, 29 ・ 42 ...
... End surface of chip guide member, 34/45 ... Flat part.

Claims (3)

[Scope of utility model registration request] 1. A cutting blade tip is provided on an outer peripheral portion of a tip of a cutter body, and a chip guide member is arranged on the cutter body so as to form a gap between the cutting blade tip and a rake face. A substantially cylindrical chip accommodating body is provided which covers the outside of the peripheral surface of the cutter body and whose tip is open to the tip side of the cutter body. The inner peripheral surface of the chip accommodating body and the outer periphery of the cutter body are arranged. A chip discharge space is formed between the surface and
Further, a communication portion that connects the chip discharge space and the suction mechanism is provided in the chip storage body, and chips generated by the cutting blade chips are guided in a predetermined direction by the gap to be sucked and discharged. In the rolling tool with suction mechanism, the end surface of the chip guide member facing the rake surface of the cutting edge tip is formed so as to gradually separate from the rake surface from the tool tip side toward the base end side. A cutting tool with a chip suction mechanism. 2. A flat portion that is substantially parallel to the rake face is provided at a tool tip side portion of an end face of the chip guide member facing the rake face of the cutting edge tip. The rolling tool with a chip suction mechanism according to claim 1. 3. The chip storage body is provided with a fixed cover and a movable cover which is located on the front end side of the fixed cover and is movable back and forth in the axial direction of the cutter body with respect to the fixed cover. The rolling tool with a chip suction mechanism according to claim 1 or 2.