JP2006123060A - Rotary cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a conventional technology wherein chips are not smoothly eliminated because chips dissipate outside a bush, and if a cutting edge part is formed in workpiece cutting shape, an air outlet is narrowed to have difficulty in ensuring a sufficient air quantity for the discharge of chips, and if the air outlet is enlarged, the shape of a cutting edge is limited to make machining capacity insufficient or the like. <P>SOLUTION: A rotary blade type cutting device comprises a rotary blade 4 for cutting a workpiece; a first cylinder 9 covering the periphery of the rotary blade 4; and a second cylinder 11 formed to cover the periphery of the first cylinder 9, to extend toward the workpiece further from the first cylinder 9 and to come in resilient contact with the workpiece to form a seal between the cylinder end and the workpiece. A first air passage 10 is formed between the rotary blade 4 and the first cylinder 9, and a second air passage 12 is formed between the first cylinder 9 and the second cylinder 11. Air is supplied through one of the first and second air passages 10, 12, and air is exhausted through the other of the first and second air passages 10, 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cutting apparatus such as a drilling machine or a milling machine used for cutting a workpiece.

Conventionally, in cutting, it has been desired to smoothly process chips. This is because the chips adhere to the processing point and do not peel off, and may become a burr-like burr, which may not be finished cleanly, and it is necessary to stop the processing device each time to remove accumulated chips This is because there arises a problem that swarf occurs, chips are entangled, the sharpness of the cutting blade is lowered, the replacement timing is advanced, and the productivity is lowered.
As a technique for removing such chips from the processing point, air is blown directly to the drill blade tip through an air hole penetrating in the longitudinal direction of the drill and cooled, and a chip accumulation chamber is provided surrounding the center part in the longitudinal direction of the drill. The bush surrounding the drill is pressed against the work material with a spring. Then, the chips are blown up in the chip discharge groove of the drill by the cooling air without being scattered to the periphery, and are accumulated in the chip accumulation chamber, and further, this chip is collected in the vacuum dust collector. For example, see Patent Document 1).
A plurality of through holes are formed in the chip container, and the first through hole is formed at a position where chips in the chip discharge space are scattered by the centrifugal force of the tool body, and air is blown into the chip discharge space. A first air jet pump is connected to the second through hole, and a second air jet pump is connected to the second through-hole to suck and discharge chips in the chip discharge space to the outside by an air flow. With regard to the divided chips generated by the cutting blade by intermittent cutting, the pressure in the chip discharge space is made lower than the outside air by the pressure of the airflow by the pump and the pressure of the airflow by the second air jet pump, especially in the chip storage Front milling machine equipped with a chip discharging device with excellent chip evacuation in the chip discharging space, including fine chips and dust that easily adhere to the inner wall Reference) is present.
Japanese Utility Model Laid-Open No. 5-31844 (refer to the paragraphs of the claims, the action column of the detailed description, the paragraphs {0007} to {0013} of the example column, and FIGS. 1, 2, 5, and 6). reference) Japanese Patent No. 2773745 (see paragraphs of claims, paragraphs {0016} to {0040} of examples column, and FIGS. 1 to 4)

In the prior art in Patent Document 1, air is supplied through a hollow rotary cutting blade, and chips are sucked between the bush and the blade on the outer periphery of the blade, and this requires a dedicated rotary blade. Yes and expensive. Further, the means for connecting the air to the rotating chuck (rotating union) is complicated, expensive, and has a problem of complicated maintenance.
Furthermore, in a milling machine in which the rotary blade moves along the workpiece, the cut portion is low, the seal may be insufficient, and if the seal does not work, chips may be dissipated outside the bush. . Therefore, strong suction is required, leading to a large output of the suction device and increasing the cost. Note that it is necessary to secure a bush seal even in a drilling machine. In addition, if the cutting edge portion substantially corresponds to the cutting shape of the workpiece, the air outlet becomes narrow, and it becomes difficult to secure a sufficient amount of air for discharging chips. There is a possibility that the shape of the blade is limited and the processing capability is not sufficient.
The prior art in Patent Document 2 is provided with a first air jet for sucking air and a second air jet for exhaust on the left and right of the rotary blade, for example. As for the direction, a side that becomes a forward flow of air and a side that becomes a reverse flow are generated with respect to the rotating shaft, and chips are carried toward the first air jet on the reverse flow side. That is, it is considered that there are many cases where the chips are loosely moved around the rotating blade, and the removal of the chips may not be performed smoothly. In addition, since the seal is single, it is difficult to seal the chips without leakage, and it is extremely difficult to collect and remove the leaked chips. Further, the structure of the peripheral edge of the machining blade becomes complicated and enormous, it is difficult to handle the pipe (a chip hose for collecting chips), there is a risk of interference with the workpiece, and the object to be machined may be limited.
Therefore, in view of such circumstances, the present invention includes a rotary blade that cuts a workpiece, a first cylinder that covers the periphery of the rotary blade, and a second cylinder that covers the periphery of the first cylinder. A first air passage is formed between the rotary blade and the first tube, and a second air passage is formed between the first tube and the second tube, and one of the first and second air passages. An object of the present invention is to provide a rotary blade type cutting device in which air is supplied through and the air is discharged through the other of the first and second air passages.

A first invention of the present invention for solving the above-mentioned problems is a rotary blade type cutting apparatus as described in claim 1, and is as follows.
It consists of a rotary blade for cutting a workpiece, a first cylinder covering the periphery of the rotary blade, and a second cylinder covering the periphery of the first cylinder, and the first between the rotary blade and the first cylinder. Air passage, and a second air passage is formed between the first tube and the second tube, air is supplied through one of the first and second air passages, and the first and second air Air is discharged through the other side of the passage.

A second invention of the present invention for solving the above-mentioned problems is a rotary blade type cutting apparatus as described in claim 2 and is as follows.
In addition to the first aspect of the invention, the second cylinder is configured to extend toward the workpiece rather than the first cylinder.

A third invention of the present invention for solving the above-mentioned problems is a rotary blade type cutting apparatus as described in claim 3 and is as follows.
In addition to the first or second aspect of the invention, the second cylinder is configured to elastically contact the work and form a seal between the cylinder end and the work.

Since the rotary blade type cutting device according to the present invention is configured as described above, the following effects can be obtained.
(1) Since the rotary blade type cutting device according to the first aspect of the present invention does not require the use of a special rotary blade, the rotary blade is not expensive, and the first covering the periphery of the rotary blade. And air is supplied through one of the first and second air passages, and the air is discharged through the other one of the first and second air passages, so that the air smoothly flows through the space around the rotary blade. Can flow. Chips generated by the rotary blade are not dissipated to the outer periphery of the cylinder. Chips are quickly blown out of the rotary blade and discharged, so the machined surface is finished cleanly. Since the double cylinder surrounding the rotary blade is formed on the same axis, the head portion of the cutting apparatus can be made compact, and can be applied to fine cutting and cutting in a narrow place.
(2) By using the rotary blade type cutting device according to claim 2 of the present invention, in addition to the effect of claim 1, the second cylinder located outside is more than the first cylinder located inside. Since it is longer toward the workpiece, it is possible to more reliably prevent the air flow and chips from being scattered outside the second cylinder. Further, even if the air supply amount and the discharge amount are set large, the air does not leak to the outside of the second cylinder.
(3) By using the rotary blade type cutting device according to claim 3 of the present invention, in addition to the effect of claim 1 or claim 2, the sealing performance of the second cylinder is improved during cutting. Therefore, it is possible to prevent the air flow and the leakage of chips to the outside of the cylinder.

  A rotary blade for cutting a workpiece, a first cylinder covering the periphery of the rotary blade, a periphery of the first cylinder, and extending toward the workpiece rather than the first cylinder. And a second cylinder that forms a seal between the cylinder end and the workpiece, and a first air passage, a first cylinder, and a second cylinder between the rotary blade and the first cylinder. A rotary blade cutting process in which a second air passage is formed between the first air passage and the air is supplied through one of the first and second air passages, and the air is discharged through the other of the first and second air passages. apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a front view showing a rotary cutting apparatus according to one embodiment of the present invention, and FIG. 2 is a partial detailed view of the rotary cutting apparatus according to one embodiment of the present invention. FIG. 3 shows a partial detailed view of the rotary cutting apparatus according to one embodiment of the present invention as viewed from the bottom surface, and FIG. 4 shows the rotary cutting apparatus according to one embodiment of the present invention. It is explanatory drawing which shows the operation | movement at the time of an action | operation.

Here, based on FIGS. 1-4, the rotary cutting device which is one Example of this invention is demonstrated in detail.
As can be understood from FIG. 1, the rotary cutting apparatus 1 according to an embodiment of the present invention is roughly composed of a high-speed and high-torque motor 2, a vacuum box 3, and a cutting tool (rotating blade) 4. The high-speed and high-torque motor 2 is connected to and held by the 6-axis robot wrist tip 7 via the flange 5 and the motor bracket 6 to perform the work.
As can be understood from FIGS. 2 to 4, the structure of the cutting part that removes the face 8 generated at the time of cutting has a fixed space (first air passage) 10 on the same axis on the cutting tool (rotary blade) 4. It is provided and covered with an aluminum case (first cylinder) 9, and an air flow port (second air passage) 12 is provided on the outer periphery thereof in a slit shape in all directions. A soft resin hose (second tube) 11 is attached to the outer periphery of the air flow port (second air passage) 12 to guide the air to the cutting portion and flow from the external air flow port (second air passage) 12. The face 8 prevents the facets 8 from scattering outside. At this time, the cut face 8 is blown up between the cutting tool (rotating blade) 4 and the aluminum case (first cylinder) 9 by air, and at the same time, into the vacuum port 13 provided on the side of the vacuum box 3. It is absorbed in a vacuum box 3 provided under the motor bracket 6 by a connected vacuum cleaner or suction device, and discharged from the vacuum port 13 into the vacuum cleaner or suction device.

Next, features of the rotary cutting apparatus 1 according to an embodiment of the present invention will be described in detail with reference to FIG.
The cutting condition of the rotary cutting apparatus 1 that moves while cutting from the right side to the left side in the figure with respect to the product 15 (for example, a synthetic resin product) is, for example, the rotation speed of the cutting tool (rotating blade) 4 is 14000 rpm to 27000 rpm. Then, it is moved by cutting at a speed of 50 to 100 mm / sec in the traveling direction. At this time, when the facet 8 is sucked out from the outside by using a vacuum cleaner or a suction device, the resin hose (second cylinder) 11 is pressed against the product 15 and bent, so that the air shield is formed on the uncut side of the product 15. Part 14 is formed. The rotary cutting apparatus 1 is provided with an air flow port (second air passage) 12 between an aluminum case (first cylinder) 9 and a resin hose (second cylinder) 11, and from the outside during cutting. By greatly increasing the amount of air sucked and blowing the cutting part locally so that the facet 8 does not get tangled with the cutting tool (rotating blade) 4, the removal of the facet 8 during cutting is ensured. Become. As a result, the cutting tool (rotating blade) 4 is not entangled with the cutting tool (rotating blade) 4, so that the cutting tool (rotating blade) 4 does not vibrate, the thickness of the cutting surface is stable, and the surface becomes clean. It is.

  In the above embodiment, air is supplied from the air flow port (second air passage) 12 and a space (first air passage) between the cutting tool (rotary blade) 4 and the aluminum case (first cylinder) 9 is provided. However, it is needless to say that air can be supplied from the first air passage 10 and discharged to the second air passage 12.

  The present invention can be used for various machining devices such as various drilling machines and milling machines used for flat machining of work materials that require a narrow machining such as a narrow groove structure.

It is a front view which shows the rotary cutting device which is one Example of this invention. 1 is a partial detail view of a rotary cutting apparatus that is an embodiment of the present invention. It is the partial detail view which looked at the rotary cutting device which is one Example of this invention from the lower surface. It is explanatory drawing which shows the operation | movement at the time of the action | operation of the rotary cutting device which is one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 .... Rotary cutting device 2 .... High speed high torque motor 3 .... Vacuum box 4 .... Cutting tool (rotating blade)
5 ... Flange
6 .... Motor bracket 7 .... 6 axis robot wrist tip 8 .... Cut 9 .... Aluminum case (first tube)
10... First air passage 11... Resin hose (second tube)
12 .... Air flow port (second air passage)
13 .... Vacuum port 14 ... Air shield 15 ... Product 16 ... Suction port 17 ... Cutting surface

Claims (3)

  A rotary blade that cuts the workpiece, a first cylinder that covers the periphery of the rotary blade, and a second cylinder that covers the periphery of the first cylinder, and the first between the rotary blade and the first cylinder. Air passage, and a second air passage is formed between the first tube and the second tube, air is supplied through one of the first and second air passages, and the first and second air A rotary blade cutting apparatus characterized in that air is discharged through the other side of the passage.   The rotary cutting apparatus according to claim 1, wherein the second cylinder is formed so as to extend toward the workpiece rather than the first cylinder.   The rotary cutting apparatus according to claim 1 or 2, wherein the second cylinder is elastically contacted with the workpiece to form a seal between the cylinder end and the workpiece.

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