JP5335322B2 - Rotary cutting device with an annular cutting blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary cutting device for sufficiently suppressing the energy loss of ultrasonic vibration generated by an ultrasonic vibrator. <P>SOLUTION: The rotary cutting device comprises: a rotating shaft 31; a cutting tool 35 including an annular cutting blade 32 arranged coaxially around the rotating shaft 31, and an annular supporting plate 34 fixed coaxially to one surface of the cutting blade 32 and having the annular ultrasonic vibrator 33 on the surface; and a pair of flanges 36a, 36b holding the cutting tool 35 via a supporting plate in an annular region on the outer periphery side beyond the peripheral edge of the ultrasonic vibrator 33. The flanges hold the cutting tool via annular porous members 37a, 37b. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a rotary cutting device provided with an annular cutting blade, which can be used particularly advantageously for cutting and grooving or cutting a workpiece.

  In order to cut a workpiece formed of a hard and brittle material typified by glass, silicon, sapphire, and silicon carbide (SiC), a rotary cutting device having an annular cutting blade is widely used.

  In such a rotary cutting apparatus, the workpiece is cut by bringing the cutting edge provided on the outer peripheral edge thereof into contact with the workpiece while rotating the annular cutting blade.

  It is known that the accuracy of cutting a workpiece is improved by applying ultrasonic vibration to the cutting blade of such a rotary cutting device.

  FIG. 1 is a cross-sectional view showing the configuration of the rotary cutting device of Patent Document 1. As shown in FIG.

  A rotary cutting device 10 in FIG. 1 includes a rotary shaft 11, an annular cutting blade 12 that is coaxially disposed around the rotary shaft 11, and each annular blade that is coaxially fixed to each surface of the cutting blade 12. The cutting tool 15 including annular support plates (rigid plates) 14a and 14b having ultrasonic transducers 13a and 13b on the surface, and the cutting tool 15 on the outer peripheral side of the outer peripheral edge of the ultrasonic transducers 13a and 13b. It is comprised from a pair of flange 16a, 16b etc. which are pinched | interposed through support plate 14a, 14b in the annular area. The pair of flanges 16a and 16b of the rotary cutting apparatus 10 sandwich the cutting tool 15 via the resin material layers 17a and 17b.

  In the same document, since the acoustic impedance value of the resin material layer and the acoustic impedance value of the flange are greatly different, the ultrasonic vibration generated in each ultrasonic vibrator is difficult to be transmitted to the flange, and as a result, It is described that the ultrasonic vibration is sufficiently applied to the cutting blade.

  FIG. 2 is a cross-sectional view showing a configuration of the rotary cutting device of Patent Document 2. As shown in FIG.

A rotary cutting device 20 in FIG. 2 includes a rotary shaft 21, an annular cutting blade 22 that is coaxially disposed around the rotary shaft 21, and an annular super-blade that is coaxially fixed to each surface of the cutting blade 22. A cutting tool 25 including the ultrasonic transducers 23a and 23b, and a pair of flanges 26a and 26b that support the cutting tool 25 in an annular region on the outer peripheral side of the outer peripheral edges of the ultrasonic transducers 23a and 23b. Has been. The pair of flanges 26 a and 26 b of the rotary cutting device 20 directly sandwich the cutting tool 25.
International Publication No. 2006/126302 Pamphlet (Figure 6) Japanese Patent Laying-Open No. 2007-130746 (FIG. 6)

  In the rotary cutting device of the above-mentioned Patent Document 1, by using a pair of flanges, by sandwiching a cutting tool through a resin material layer showing an acoustic impedance value greatly different from the acoustic impedance values of these flanges, Propagation of ultrasonic vibration generated by the ultrasonic vibrator to the flange is suppressed. For this reason, the ultrasonic vibration generated by the ultrasonic vibrator is effectively used for ultrasonically vibrating the cutting blade.

In such a rotary cutting device, the flange is usually formed from a metal material. The acoustic impedance (unit: Ns / m ³ , hereinafter the same) of the metal material is, for example, 46.4 × 10 ⁶ for iron, 17.3 × 10 ^{6 for} aluminum, and 45.7 × 10 ^{6 for} stainless steel. It is. On the other hand, the acoustic impedance of the resin material is, for example, 1.75 × 10 ⁶ for polyethylene and 2.49 × 10 ⁶ for polystyrene. Thus, since the acoustic impedance value of the resin material is approximately one tenth of the acoustic impedance of the metal material, it is generated in the ultrasonic vibrator by selecting the resin material for forming the resin material layer. It is difficult to further suppress the propagation of ultrasonic vibration to the flange (occurrence of loss of energy of ultrasonic vibration).

  An object of the present invention is to provide a rotary cutting apparatus in which generation of loss of energy of ultrasonic vibration generated by an ultrasonic vibrator is sufficiently suppressed.

  The present invention relates to a rotating shaft; an annular cutting blade disposed coaxially around the rotating shaft, and an annular surface provided with an annular ultrasonic transducer fixed coaxially to at least one surface of the cutting blade And a pair of flanges sandwiching the cutting tool in the annular region on the outer peripheral side of the outer periphery of the ultrasonic transducer via the support plate, and the cutting tool using the flange. The rotary cutting apparatus is characterized in that the pinching is performed via an annular porous member.

  The present invention also includes a rotating shaft; an annular cutting blade disposed coaxially around the rotating shaft; and a cutting tool including an annular ultrasonic transducer fixed coaxially to at least one surface of the cutting blade; And a pair of flanges holding the cutting tool in an annular region on the outer peripheral side of the outer peripheral edge of the ultrasonic transducer, and the cutting tool is held by the flange via an annular porous member There is also a rotary cutting device characterized by the following.

Preferred embodiments of the rotary cutting device of the present invention are as follows.
(1) The annular porous member is made of a porous resin material.
(2) The annular porous member has a bulk density in the range of 10 to 300 kg / m ³ .
(3) In the rotary cutting apparatus provided with the above-described support plate, the support plate has an annular shape through a non-space portion that extends in the thickness direction of the support plate on the inner peripheral side with respect to the inner peripheral edge of the annular ultrasonic transducer. And an ultrasonic reflection surface formed by interfaces with a plurality of arc-shaped air phase spaces disposed in the space. More preferably, another air phase space is formed on the inner peripheral side of each of the non-space portions to constitute an additional ultrasonic reflection surface.
(4) a plurality of arc-shaped air phase spaces arranged in an annular shape through a non-space portion, the cutting blade extending in the thickness direction of the cutting blade on the inner peripheral side with respect to the inner peripheral edge of the annular ultrasonic transducer; And an ultrasonic reflection surface formed by the interface. More preferably, another air phase space is formed on the inner peripheral side of each of the non-space portions to constitute an additional ultrasonic reflection surface.

  In the rotary cutting device of the present invention, the pair of flanges sandwich the cutting tool including the annular cutting blade and the ultrasonic vibrator via the annular porous member. And most of the ultrasonic vibration generated by the ultrasonic vibrator of the cutting tool is reflected by the ultrasonic reflecting surface composed of the bubbles contained in the annular porous member, and therefore passes through the annular porous member. There is no propagation to the flange. Therefore, in the rotary cutting device of the present invention, the ultrasonic vibration generated by the ultrasonic vibrator hardly propagates to the flange via the annular porous member, that is, the energy loss of the ultrasonic vibration due to the propagation is reduced. It is very effectively used for ultrasonically vibrating the cutting blade with almost no generation.

  Next, the rotary cutting device of the present invention will be described with reference to the accompanying drawings.

  FIG. 3 is a cross-sectional view showing a configuration example of the rotary cutting device of the present invention. FIG. 4 is a diagram showing the cutting tool 35 shown in FIG. FIG. 5 is a view of the cutting tool 35 of FIG. 4 as viewed from the right side of the drawing.

  A rotary cutting device 30 shown in FIGS. 3 to 5 includes a rotary shaft 31, an annular cutting blade 32 coaxially disposed around the rotary shaft 31, and a coaxial surface fixed to one surface of the cutting blade 32. A cutting tool 35 including an annular support plate 34 provided with an annular ultrasonic transducer 33 on the surface, and a support plate for the cutting tool 35 in an annular region on the outer peripheral side of the outer peripheral edge of the ultrasonic transducer 33. It is comprised from a pair of flange 36a, 36b etc. which are clamped via 34. The rotary cutting device 30 is characterized in that the cutting tool 35 is sandwiched by the flanges 36a and 36b via the annular porous members 37a and 37b.

  In the cutting device 30, a driving device connected to the rotating shaft 31 is operated, the rotating shaft 31 is rotated together with the cutting tool 35, and ultrasonic waves generated by the ultrasonic vibrator 33 on the cutting blade 32 of the cutting tool 35. The cutting (grooving or cutting) of the workpiece is performed by bringing the cutting edge 32 at the outer peripheral edge of the cutting blade 32 into contact with the workpiece while applying vibration through the support plate 34. Usually, when cutting a workpiece, a coolant (typical example, water) is supplied to a contact portion between the cutting blade and the workpiece.

  As described above, the flanges 36a and 36b of the cutting device 30 sandwich the cutting tool 35 via the annular porous members 37a and 37b.

  Each of the annular porous members 37a and 37b is formed of a known porous material, for example, a porous resin material or a porous metal material.

  Examples of the porous resin material include foamed polyurethane resin, foamed polystyrene resin, foamed silicone resin, and foamed rubber. When a porous resin material is used as the material of the annular porous member, the annular porous member can be easily produced by cutting a polyurethane foam, a polystyrene foam, a silicone sponge, or a rubber sponge into an annular shape.

  In the case of using a porous metal material, the annular porous member may be prepared by, for example, compressing and molding metal powder (or metal fiber) such as bronze, stainless steel, nickel, or titanium. it can. When the annular porous member is formed from a porous metal material, a resin material layer can be provided on the surface of the annular porous member on the cutting tool side.

The porous material contains a large number of bubbles therein. This bubble (gas) shows an extremely small acoustic impedance value as compared with a resin material or a metal material (solid). For example, air has an acoustic impedance of about 429 Ns / m ^3, that is, about one tenth of the value of acoustic impedance of a resin material and about one hundred thousand of the value of acoustic impedance of a metal material. Indicates a small acoustic impedance value.

  For this reason, most of the ultrasonic vibration applied to the support plate 34 from the ultrasonic transducer 33 is at the interface between the resin material or metal material (solid) forming the annular porous members 37a and 37b and the bubbles (gas). Since it is reflected by the formed ultrasonic reflecting surface, it does not propagate through the annular porous members 37a, 37b to the flanges 36a, 36b (no loss of ultrasonic vibration energy occurs). As a result, the ultrasonic vibration generated by the ultrasonic vibrator 33 is effectively used to cause the cutting blade 32 to ultrasonically vibrate together with the support plate 34. Further, since it is not necessary to give the ultrasonic vibrator 33 large electrical energy that compensates for the loss of ultrasonic vibration, the amount of heat generated by the ultrasonic vibrator 33 is reduced, and the thermal expansion of the cutting blade 32 due to this heat generation is reduced. It is suppressed. For this reason, by using the rotary cutting device 30 of the present invention, the workpiece can be cut with extremely high accuracy.

  Further, since the ultrasonic vibration applied to the support plate 34 hardly propagates to the bearing 46 supporting the rotary shaft 31 via the annular porous members 37a and 37b, the flanges 36a and 36b, and the rotary shaft 31, Failure of the bearing 46 due to application of ultrasonic vibration can be prevented.

  Furthermore, since the ultrasonic vibrator 33 is accommodated in the space formed by the flange 36a, the annular porous member 37a, and the cutting blade 32, the cutting blade and the workpiece are contacted during the cutting process. Even when a coolant (representative example, water) showing electrical conductivity is supplied (injected) to the part, the pair of electrode layers of the ultrasonic vibrator are electrically short-circuited by contact with the coolant. This can be prevented.

The annular porous member preferably has a bulk density in the range of 10 to 300 kg / m ^{3 in} order to effectively suppress the ultrasonic vibration from propagating to the flange via the annular porous member. . For example, as described above, the polyurethane foam used as the material for the annular porous member has a bulk density of about 35 kg / m ³ , the polystyrene foam has a bulk density of about 35 kg / m ³ , and the silicone sponge has a bulk density. There of about 220 kg / m ^3, or bulk density as the rubber sponge is commercially available in about 160 kg / m ^3.

  In the rotary cutting device 30 of the present invention, the support plate 34 is formed in an annular shape via a non-space part 51 a that extends in the thickness direction of the support plate 34 on the inner peripheral side of the annular ultrasonic transducer 33. It is preferable to include an ultrasonic reflection surface formed by an interface with a plurality of (for example, four) arcuate air phase spaces 52a arranged.

  By providing such a plurality of arc-shaped air phase spaces 52a, the ultrasonic vibration applied from the ultrasonic transducer 33 to the support plate 34 during the cutting process is formed by each arc-shaped air phase space 52a. Is reflected by the ultrasonic reflection surface 53a and transmitted to the outer peripheral side of the support plate 34, and hardly transmitted to the inner peripheral side of the support plate 34 from the ultrasonic reflection surface 53a. For this reason, the ultrasonic vibration generated by the ultrasonic vibrator 33 hardly propagates to the rotating shaft 31 through the inner peripheral edge of the support plate 34 (generates energy loss of ultrasonic vibration), It is very effectively used for ultrasonically vibrating the cutting blade 32 together with the support plate 34.

  In the support plate 34, it is more preferable that another air phase space 52b is formed on the inner peripheral side of each of the non-space portions 51a, and an additional ultrasonic reflection surface 53b is configured. Thereby, the ultrasonic vibration propagating through the non-space portions 51a of the support plate 34 toward the inner peripheral side is reflected by the additional ultrasonic reflection surface 53b. For this reason, the ultrasonic vibration generated by the ultrasonic vibrator 33 is more effectively used for ultrasonically vibrating the cutting blade 32 together with the support plate 34.

  The air phase space is an air phase space inside a through hole formed in the support plate, or an air phase space inside a recess (eg, a non-through hole or a non-through groove) formed in the support plate. Can also be used.

  In order to effectively suppress the ultrasonic vibration from propagating to the rotation axis through the inner peripheral edge of the support plate, the support plate has 50 to 100% (preferably 70 to 90%, particularly 70 to 90%, particularly in the circumferential direction). It is desirable that an ultrasonic reflection surface (including the above-described additional ultrasonic reflection surface) be formed in a portion within a range of 90 to 100%.

  Further, in the rotary cutting device of the present invention, as shown in FIG. 3, the cutting tool 35 is disposed on each of the flanges 36a and 36b at a position on the inner peripheral side with respect to the inner peripheral edge of the ultrasonic transducer 33 (however, When the ultrasonic reflecting surfaces 53a and 53b are formed on the support plate 34 as described above, the support plate 34 supports the ultrasonic reflection surfaces 53a and 53b on the inner peripheral side of the ultrasonic reflection surfaces 53a and 53b. It is preferable that annular support portions 45a and 45b are provided.

  As described above, in the rotary cutting device 30, propagation of ultrasonic vibration applied to the support plate 34 to the flanges 36 a and 36 b is suppressed by the annular porous members 37 a and 37 b. In order to effectively suppress the propagation of such ultrasonic vibrations, it is preferable to reduce the density of the annular porous members 37a and 37b as much as possible (increase the porosity). However, when the density of the annular porous members 37a and 37b is extremely reduced, the mechanical strength is lowered, and the cutting edge of the outer peripheral edge of the cutting blade 32 is supported by the annular porous members 37a and 37b of the cutting tool 35. It becomes easy to move (swing) with the part as a fulcrum.

  When the cutting tool 35 is supported by the annular porous members 37a and 37b provided on the flanges 36a and 36b and the annular support portions 45a and 45b, the cutting blade 32 is extremely stable by the flanges 36a and 36b. Therefore, the movement (swing) of the cutting edge of the cutting blade 32 is suppressed. For this reason, even if the density of the annular porous members 37a and 37b is extremely small in order to sufficiently suppress the propagation of ultrasonic vibrations to the flanges 36a and 36b, the object to be processed is stably and highly accurate. Can be cut.

  Below, the detailed structure of the rotary cutting device 30 of this invention is demonstrated.

  The annular cutting blade 32 is set in a disk shape having a circular hole 32a at the center. As the cutting blade 32, for example, a circular saw, a disk-shaped cutting blade in which abrasive grains are fixed to the outer peripheral edge of a disk-shaped substrate, or a disk-shaped cutting blade manufactured from abrasive grains and a resin (binder) ( A known disc-shaped cutting blade represented by a resinoid blade) is used.

  The disk-shaped substrate of the cutting blade can be formed of, for example, a metal material such as aluminum, titanium, iron, aluminum alloy, or stainless steel, or a resin material.

  Examples of the abrasive grains include diamond particles, alumina particles, silica particles, iron oxide particles, chromium oxide particles, silicon carbide particles, and cubic boron nitride (CBN) particles. Usually, the average grain size of the abrasive grains is set to a value in the range of 0.1 to 50 μm.

  The abrasive grains are fixed (electrodeposited) to the outer peripheral edge of the disk-shaped substrate by, for example, plating the disk-shaped substrate with a plating bath containing the abrasive grains. The abrasive grains can also be fixed to a disk-shaped substrate using a binder resin (eg, phenol formalin resin).

  On one surface of the cutting blade 32, an annular support plate 34 having an annular ultrasonic transducer 33 is fixed coaxially with the cutting blade 32. The support plate 34 supports the cutting blade 32 in an annular region on the inner peripheral side with respect to the outer peripheral edge.

  The cutting blade 32 and the support plate 34 (or a reinforcing plate 38 described later) are fixed to each other using, for example, an adhesive. As this adhesive, it is preferable to use a hot-melt adhesive. When a hot-melt adhesive is used, the support plate 34 can be easily removed from the cutting blade 32 together with the ultrasonic vibrator 33 by heating the cutting blade 32 and the support plate 34 to dissolve the adhesive. . Therefore, for example, the support plate 34 provided with the ultrasonic transducer 33 can be removed from the cutting blade 32 whose blade edge is worn by use, and this can be fixed to the surface of another new cutting blade and reused. That is, it becomes possible to reuse an ultrasonic transducer having a high manufacturing cost without being discarded.

  An annular reinforcing plate 38 that supports the cutting blade 32 together with the support plate 34 is preferably fixed to the other surface of the cutting blade 32. The reinforcing plate 38 also supports the cutting blade 32 in an annular region on the inner peripheral side with respect to the outer peripheral edge. If the cutting blade 32 and the support plate 34 are securely fixed and the cutting blade 32 is not detached from the support plate 34 during the cutting process, the reinforcing plate 38 may not be used. .

  The support plate 34 and the reinforcing plate 38 are made of a metal material such as titanium, iron, aluminum, aluminum alloy, titanium alloy, or stainless steel, or a ceramic material such as aluminum oxide or glass.

  The support plate 34 has a function of reinforcing the cutting blade 32 (making it difficult to bend in the thickness direction) when the cutting blade 32 is thin. For this reason, the cutting blade 32 reinforced by the support plate 34 is unlikely to vibrate ultrasonically in the thickness direction even when the thickness is thin. By using such a support plate 34, it becomes possible to perform cutting with high accuracy regardless of the thickness of the cutting blade that uses the workpiece.

  As the annular ultrasonic vibrator 33, for example, a piezoelectric vibrator having a configuration in which an electrode layer is attached to the surface of each annular piezoelectric body is used. The piezoelectric vibrator generates ultrasonic vibration that vibrates in the diameter direction when electric energy (eg, AC voltage) is applied between electrode layers on both surfaces thereof.

  The piezoelectric body of the ultrasonic vibrator (piezoelectric vibrator) 33 is usually polarized in the thickness direction (left and right directions in FIG. 3).

  Examples of the piezoelectric material include lead zirconate titanate-based piezoelectric ceramic materials and piezoelectric polymer materials typified by polyvinylidene fluoride resin. Moreover, metal materials, such as silver and phosphor bronze, are mentioned as an example of the material of an electrode.

  The ultrasonic vibrator 33 of the cutting tool 35 shown in FIG. 3 is fixed to the surface of the support plate 34 using a conductive adhesive. When a conductive adhesive is used, the electrode layer on the support plate 34 side of the ultrasonic transducer 33, the support plate 34, and the flange 36a are electrically connected to each other. For this reason, it becomes easy to electrically connect the electrode layer on the support plate 34 side of the ultrasonic transducer 33 to the rotary transformer 41 described below via the support plate 34 and the flange 36a. Note that the ultrasonic vibrator can be fixed to the surface of the support plate using an adhesive having no conductivity. In this case, the electrode layer on the support plate side of the ultrasonic transducer and the rotary transformer may be directly connected (without the support plate and the flange), for example, using electrical wiring.

  The ultrasonic transducer 33 of the cutting tool 35 is electrically connected to a power source 39 via a rotary transformer 41. The rotary transformer 41 includes an annular power supply means 41a and an annular power reception means 41b arranged to face the power supply means 41a. The power supply means 41a includes a stator coil 42a on the surface facing the power receiving means 41b. The power receiving means 41b includes a rotor coil 42b on the surface facing the power supply means 41a.

  A power source 39 is electrically connected to the stator coil 42a of the power supply means 41a via electric wires 43a and 43b.

  Electrical wirings 44a and 44b are connected to the rotor coil 42b of the power receiving means 41b. The electrical wiring 44a is electrically connected to a rod-shaped electrode terminal 48 accommodated and disposed in a state of being electrically insulated from the flange 36a inside a through hole formed in the flange 36a. The rod-shaped electrode terminal 48 is pressed against the ultrasonic transducer 33 using, for example, a coil spring (not shown), and is electrically connected to the electrode layer on the opposite side of the support plate 34 of the ultrasonic transducer 33. It is connected to the. On the other hand, the electrical wiring 44 b is electrically connected to the electrode layer on the support plate 34 side of the ultrasonic transducer 33 via the flange 36 a and the support plate 34.

  The stator coil 42a and the rotor coil 42b are magnetically coupled to each other by supplying electric energy generated by the power supply 39 to the stator coil 42a of the power supply means 41a. For this reason, the electric energy supplied to the power supply means 41a causes the stator coil 42a and the rotor coil 42b to pass through even when the flange 36a to which the power receiving means 41b is fixed rotates with the rotary shaft 31. To the power receiving means 41b.

  By using the rotary transformer 41, the electric energy generated by the power source 39 can be applied to the ultrasonic vibrator 33 of the cutting tool 35 that rotates together with the rotary shaft 31 when the workpiece is cut. Since the rotary transformer is a known one, further explanation is omitted. The power source and the ultrasonic transducer can be electrically connected via a slip ring instead of the rotary transformer.

  FIG. 6 is a sectional view showing another configuration example of the rotary cutting device of the present invention. In the configuration of the rotary cutting device 60 of FIG. 6, a support plate 64a having an annular ultrasonic transducer 63a on the surface is fixed to one surface of a cutting blade 62 of a cutting tool 65, and an annular surface is attached to the other surface. 3 is the same as the cutting device 30 of FIG. 3 except that the support plate 64b having the ultrasonic transducer 63b is fixed on the surface.

  As shown in FIG. 6, support plates 64 a and 64 b each having an annular ultrasonic transducer 63 a and 63 b on the surface can be fixed to each surface of the cutting blade 62 of the cutting tool 65.

  Each of the support plates 64a and 64b of the cutting tool 65 also has an arcuate air phase space 52a that constitutes an ultrasonic reflection surface and an arcuate air phase that is different from the above that constitutes an additional ultrasonic vibration reflection surface. A space 52b is formed.

  In addition, in order to suppress the ultrasonic vibration applied to the cutting blade from propagating through the inner peripheral edge of the cutting blade to the rotating shaft, the cutting blade has an annular shape as in the case of the support plates 64a and 64b. Ultrasonic waves formed by interfaces with a plurality of arc-shaped air phase spaces arranged in an annular shape through a non-space portion extending in the thickness direction of the cutting blade on the inner peripheral side of the inner peripheral edge of the ultrasonic transducer It is preferable to have a reflective surface. Further, it is more preferable that another air phase space is formed on the inner peripheral side of each non-space portion of the cutting blade to constitute an additional ultrasonic reflection surface.

  The electrode layer on the side opposite to the support plate 64b side of the ultrasonic vibrator 63b of the cutting tool 65 is an air phase space 52a of the support plate 64a and an air phase space inside the through hole formed in the cutting blade 62. 52c and the electrical wiring 47 passing through the air phase space 52a of the support plate 64b are electrically connected to the electrode layer opposite to the support plate 63a side of the ultrasonic transducer 63a. Accordingly, the ultrasonic transducers 63a and 63b are electrically connected to each other in parallel. These ultrasonic transducers 63 a and 63 b are electrically connected to the power source 39 via the rotary transformer 41.

  FIG. 7 is a cross-sectional view showing still another configuration example of the rotary cutting device of the present invention. The configuration of the rotary cutting device 70 of FIG. 7 is the same as that of FIG. 6 except that a support plate 64a having an annular ultrasonic transducer 63a on the surface is fixed only to one surface of the cutting blade 62 of the cutting tool 75. This is the same as the cutting device 60 of FIG.

  The cutting device 70 of FIG. 7 has an advantage that the construction of the cutting tool 75 is simple and the manufacture thereof is easy.

  FIG. 8 is a cross-sectional view showing still another configuration example of the rotary cutting device of the present invention. The configuration of the rotary cutting device 80 of FIG. 8 is the same as that of the cutting device 30 of FIG. 3 except that the cutting tool 85 does not include a support plate.

  That is, the rotary cutting device 80 in FIG. 8 includes a rotary shaft 31, an annular cutting blade 82 disposed coaxially around the rotary shaft 31, and an annular fixed coaxially to one surface of the cutting blade 82. And a pair of flanges 36a, 36b that hold the cutting tool 85 in an annular region on the outer peripheral side of the outer peripheral edge of the ultrasonic transducer 33, and the like. Yes. This rotary cutting device 80 is also characterized in that the cutting tool 85 is sandwiched by the flanges 36a and 36b via the annular porous members 37a and 37b.

  Also in this rotary cutting device 80, most of the ultrasonic vibration applied from the ultrasonic transducer 33 to the cutting blade 82 is made of resin material or metal material (solid) and bubbles (gas) forming the annular porous members 37a and 37b. ) And propagates to the flanges 36a and 36b through these annular porous members 37a and 37b (causing loss of energy of ultrasonic vibration). There is nothing. As a result, the ultrasonic vibration generated by the ultrasonic vibrator 33 is effectively used to cause the cutting blade 82 to vibrate ultrasonically. Further, since it is not necessary to give the ultrasonic vibrator 33 large electrical energy to compensate for the loss of ultrasonic vibration, the amount of heat generated by the ultrasonic vibrator 33 is reduced, and the thermal expansion of the cutting blade 82 due to this heat generation is reduced. It is suppressed. For this reason, by using the rotary cutting device 80 of the present invention, the workpiece can be cut with extremely high accuracy.

  As in the case of the support plate 34 of the rotary cutting device 30 of FIG. 3, the cutting blade 82 of the rotary cutting device 80 of FIG. 8 is closer to the inner peripheral side than the inner peripheral edge of the annular ultrasonic transducer 33. It is preferable to include an ultrasonic wave reflecting surface 93a formed by interfaces with a plurality of arc-shaped air phase spaces 92a that are annularly arranged with a non-space portion extending in the thickness direction. In the cutting blade 82, it is more preferable that another air phase space 92b is formed on the inner peripheral side of each of the non-space portions to constitute an additional ultrasonic reflection surface 93b.

  Further, the cutting tool 85 is disposed on each of the flanges 36a and 36b of the rotary cutting device 80 at a position closer to the inner peripheral side than the inner peripheral edge of the ultrasonic transducer 33 (however, as described above, the ultrasonic reflecting surface 93a , 93b are preferably provided with annular support portions 45a, 45b that are supported at positions on the inner peripheral side of these ultrasonic reflecting surfaces 93a, 93b.

  The detailed configuration of the cutting device 80 shown in FIG. 8 and other preferable modes are the same as those of the cutting device 30 shown in FIG.

It is sectional drawing which shows the structure of the rotary cutting apparatus of patent document 1. FIG. It is sectional drawing which shows the structure of the rotary cutting apparatus of patent document 2. FIG. It is sectional drawing which shows the structural example of the rotary cutting device of this invention. FIG. 4 is a view showing a state in which the cutting tool 35 shown in FIG. It is the figure which looked at the cutting tool 35 of FIG. 4 from the right side of the figure. It is sectional drawing which shows another structural example of the rotary cutting device of this invention. It is sectional drawing which shows another structural example of the rotary cutting device of this invention. It is sectional drawing which shows another structural example of the rotary cutting device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotating cutting device 11 Rotating shaft 12 Cutting blade 13a, 13b Ultrasonic vibrator 14a, 14b Support plate 15 Cutting tool 16a, 16b Flange 17a, 17b Resin material layer 20 Rotating cutting device 21 Rotating shaft 22 Cutting blade 23a, 23b Ultrasonic Vibrator 25 Cutting tool 26a, 26b Flange 30 Rotary cutting device 31 Rotating shaft 32 Cutting blade 32a Circular hole 33 Ultrasonic vibrator 34 Support plate 35 Cutting tool 36a, 36b Flange 37a, 37b Annular porous member 38 Reinforcement plate 39 Power supply 41 Rotary transformer 41a Electric power supply means 41b Electric power receiving means 42a Stator coil 42b Rotor coil 43a, 43b Electric wiring 44a, 44b Electric wiring 45a, 45b Annular support 46 Bearing 47 Electric wiring 48 Rod electrode terminal 51a, 51b Non Space 52a, 52b Air phase space 52c Air phase space 53a, 53b Ultrasonic reflection surface 60 Rotating cutting device 62 Cutting blade 63a, 63b Ultrasonic vibrator 64a, 64b Support plate 65 Cutting tool 70 Rotary cutting device 75 Cutting tool 80 Rotation Cutting device 82 Cutting blade 85 Cutting tool 92a, 92b Air phase space 93a, 93b Ultrasonic reflecting surface

Claims (7)

A rotating shaft; an annular cutting blade coaxially disposed around the rotating shaft; and an annular support having a surface provided with an annular ultrasonic transducer fixed coaxially to at least one surface of the cutting blade A cutting tool including a plate; and a pair of flanges that sandwich the cutting tool in an annular region on the outer peripheral side of the outer peripheral edge of the ultrasonic transducer via a support plate, , Wherein the support plate extends in the thickness direction of the support plate closer to the inner periphery than the inner periphery of the annular ultrasonic transducer. And an ultrasonic reflecting surface formed by interfaces with a plurality of arc-shaped air phase spaces arranged in an annular shape through the non-space portion . A cutting tool including an annular cutting blade disposed coaxially around the rotational shaft, and an annular ultrasonic vibrator fixed coaxially to at least one surface of the cutting blade; and the cutting A pair of flanges holding the tool in an annular region on the outer peripheral side of the outer peripheral edge of the ultrasonic transducer, and the cutting tool is held by the flange via an annular porous member. However, the cutting blade has a plurality of arcuate shapes arranged in an annular shape through a non-space portion extending in the thickness direction of the blade on the inner peripheral side with respect to the inner peripheral edge of the annular ultrasonic transducer. An ultrasonic reflecting surface formed by an interface with the air phase space is provided .   The rotary cutting device according to claim 1 or 2, wherein the annular porous member is made of a porous resin material. The rotary cutting device according to claim 1 or 2, wherein the annular porous member has a bulk density in a range of 10 to 300 kg / m ³ . The rotary cutting device according to claim 1, wherein another air phase space is formed on the inner peripheral side of each non-space portion to constitute an additional ultrasonic reflection surface. The cutting blade extends from the inner peripheral side of the annular ultrasonic transducer to the inner peripheral side in the thickness direction of the blade by an interface with a plurality of arc-shaped air phase spaces arranged annularly via a non-space portion. The rotary cutting device according to claim 1, further comprising an ultrasonic reflection surface to be formed. The rotary cutting device according to claim 2 or 6, wherein another air phase space is formed on the inner peripheral side of each non-space portion to constitute an additional ultrasonic reflection surface.

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