JP2011051077A - Ultrasonic cutting device and ultrasonic horn for use in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic cutting device which can allow the angle and height of an edge of a cutting tool to be easily adjusted against an ultrasonic vibrator. <P>SOLUTION: The ultrasonic cutting device comprises an ultrasonic horn 4 comprising a rectangular parallelepiped-shaped horn body 40, a holder 2, a plurality of node flanges 41 disposed on both outer sides of two faces that are orthogonal to a face, on which an ultrasonic vibrator 3 is fixed, and are opposed to each other, and a plurality of flange bases 41a connected to the horn body 40, the plurality of node flanges 41 and a mounting base being detachably fixed with a plurality of screws 8 at a plurality of sites within the contact faces. The horn body 40 and the holder 2 are fastened with a screw 7 having a threaded shaft disposed on an extended line of a vibration major axis of the ultrasonic vibrator 3. A first concave 42 and a first convex 22, which are fitted into each other for threaded shaft positioning purposes, are provided around the screw 7. Further, a second concave 43 and a second convex 23 are provided, on the outer side of the first concave 42 and the first convex 22, for mutual positioning of the horn body 40 and the holder 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ultrasonic cutting apparatus for performing a cutting process such as turning or shaping by ultrasonically vibrating a cutting tool and an ultrasonic horn used in the apparatus.

  2. Description of the Related Art In recent years, an apparatus for performing cutting processing such as turning and shaping by ultrasonically vibrating a cutting tool has been developed. For example, in Patent Document 1, a throw-away tip having a bolt insertion hole, a bit having a tip fixing portion formed and a nut fixed thereto, and a screw inserted into the nut of the bit through the bolt insertion hole of the throw-away tip An ultrasonic vibration processing apparatus including a chip fixing bolt and an ultrasonic vibrator supporting a cutting tool is described.

  In this ultrasonic vibration processing apparatus, the front end portion of the bite support material of the ultrasonic vibrator protrudes like a shaft to form a screw, and a bite having a reverse screw formed at the end is attached to both screws. It is designed to be detachably connected by a fastener having a shape formed thereon. Similarly, Patent Document 2 describes a vibration cutting apparatus that attaches a cutting tip to an ultrasonic transducer.

JP-A-2-274401 JP 2002-283101 A

  By the way, in order to perform good ultrasonic vibration cutting with these devices, it is necessary to match the vibration direction of the cutting edge of the cutting tool with the cutting direction. In the structure in which the bit formed with the screw is fastened by the fastener formed with both screws, the angle of the bit changes depending on the degree of fastening of the fastener, and it is difficult to match the angle and height of the cutting edge of the bit.

  Accordingly, an object of the present invention is to provide an ultrasonic cutting apparatus capable of easily adjusting the angle and height of the cutting edge of a cutting tool with respect to an ultrasonic vibrator and an ultrasonic horn used therefor. And

  The ultrasonic cutting apparatus of the present invention has a holder for holding a cutting tool, an ultrasonic vibrator for exciting ultrasonic vibration, and a rectangular parallelepiped shape, and the holder and the ultrasonic vibrator are fixed to two opposing surfaces. A horn main body and a node flange for fixing the horn main body to a pedestal, and a plurality of node flanges arranged on both outer sides of two opposing surfaces perpendicular to the surface to which the holder and the ultrasonic transducer are fixed And an intermediate position between the surface to which the holder of the horn body is fixed and the surface to which the ultrasonic transducer is fixed, and two opposing surfaces perpendicular to the surface to which the holder and the ultrasonic transducer are fixed It is formed in a bowl shape and consists of a plurality of flange bases that connect a plurality of node flanges to the horn body, and the plurality of node flanges and pedestals are detachably fixed by a plurality of fastening bodies at a plurality of locations within these contact surfaces. The horn body and the holder are fastened by a screw in which a screw shaft is arranged on an extension line of the vibration main shaft of the ultrasonic vibrator, and around the screw. A first concave portion and a first convex portion that are fitted to each other for positioning the screw shaft; and a second concave portion for positioning the horn body and the holder on the outside of the first concave portion and the first convex portion; A second convex portion is provided.

  According to the ultrasonic cutting apparatus of the present invention, the ultrasonic vibrator is fixed to one surface of the horn body, and the cutting tool is held on one surface of the horn body facing the surface to which the ultrasonic vibrator is fixed. The holder is fastened and fixed by a screw having a screw shaft disposed on an extension line of the vibration main shaft of the ultrasonic vibrator. Here, since the screw shaft is positioned by fitting the first concave portion and the first convex portion provided in the horn main body and the holder to each other, the screw shaft is caused by the ultrasonic vibration transmitted from the ultrasonic vibrator. The screw shaft is always arranged on the extension line of the vibration main shaft of the ultrasonic transducer without shifting, and the ultrasonic vibration is efficiently transmitted to the holder. Moreover, since the 2nd recessed part and 2nd convex part for the mutual positioning of a horn main body and a holder are provided in the outer side of this 1st recessed part and a 1st convex part, the holder was always positioned with respect to the horn main body. Since it is fixed in a state, the angle and height of the cutting edge with respect to the ultrasonic vibrator of the cutting tool held by this holder are constant. And the horn main body fixed to the two surfaces where the holder and the ultrasonic transducer are opposed to each other, the flanges on both outer sides of the two surfaces facing each other at right angles to the surface on which the holder and the ultrasonic transducer are fixed are on the pedestal. On the other hand, the flange is fixed by a plurality of fastening bodies at a plurality of locations in the contact surface between the flange and the pedestal, so that the angle of the flange with respect to the pedestal is constant regardless of the fastening degree of the fastener. Therefore, in the ultrasonic cutting apparatus of the present invention, the angle and position of the holder with respect to the pedestal are constant regardless of the fastening degree of the fastener, and the angle and height of the cutting edge with respect to the ultrasonic vibrator of the cutting tool held by the holder are high. It is possible to easily adjust the height.

  Here, it is desirable that the second concave portion and the second convex portion are positioned by the surface of the holder opposite to the surface on which the cutting tool is attached and the surface where the horn main body abuts. During the cutting operation by the cutting tool, a force is applied toward the surface on which the cutting tool of the holder is mounted. Therefore, this force is applied to the second concave portion and the second convex portion, that is, on the side opposite to the surface on which the cutting tool of the holder is mounted. By positioning and receiving the surface by the surface where the surface and the horn main body abut, the angle and height of the cutting edge with respect to the ultrasonic vibrator of the cutting tool can be kept constant.

  The ultrasonic horn of the present invention has a rectangular parallelepiped shape, a horn main body on which a holder of a cutting tool and an ultrasonic vibrator are fixed on two opposing surfaces, and a node flange for fixing the horn main body to a base, A plurality of node flanges arranged on both outer sides of two opposing surfaces perpendicular to the surface to which the holder and the ultrasonic transducer are fixed, the surface to which the holder of the horn body is fixed, and the ultrasonic transducer are fixed A plurality of flanges which are formed in a bowl shape on two opposing surfaces perpendicular to the surface to which the holder and the ultrasonic transducer are fixed, and which connect the plurality of node flanges to the horn body. It consists of a base, and a plurality of node flanges and pedestals are detachably fixed by a plurality of fastening bodies at a plurality of locations within these contact surfaces. The screw shaft is fastened by a screw disposed on an extension line of the shaft, and includes a first concave portion and a first convex portion that are fitted to each other for positioning the screw shaft around the screw. The second concave portion and the second convex portion for positioning the horn main body and the holder are provided outside the concave portion and the first convex portion. According to the ultrasonic horn of the present invention, the above-described ultrasonic cutting apparatus of the present invention is obtained.

(1) A rectangular parallelepiped, a horn main body to which a cutting tool holder and an ultrasonic vibrator are fixed on two opposing surfaces, and a node flange for fixing the horn main body to a pedestal. The holder and the ultrasonic vibration An intermediate between a plurality of node flanges arranged on both outer sides of two opposing surfaces perpendicular to the surface to which the child is fixed, a surface to which the holder of the horn body is fixed, and a surface to which the ultrasonic transducer is fixed A plurality of flange bases that are formed in a bowl shape on two opposing surfaces perpendicular to the surface to which the holder and the ultrasonic transducer are fixed, and that connect the plurality of node flanges to the horn body, The plurality of node flanges and pedestals are detachably fixed by a plurality of fastening bodies at a plurality of locations within these contact surfaces, and the horn body and the holder are on the extension line of the vibration main shaft of the ultrasonic transducer. Right A first concave portion and a first convex portion that are fastened by a screw on which a shaft is disposed and that fit around each other for positioning the screw shaft around the screw. According to the ultrasonic horn, the angle and position of the holder with respect to the pedestal are fastened with the second concave portion and the second convex portion for positioning the horn body and the holder on the outside of the horn. It becomes constant regardless of the fastening condition of the tool, and the angle and height of the cutting edge with respect to the ultrasonic vibrator of the cutting tool held by this holder can be easily matched. Further, when the first concave portion and the first convex portion provided in the horn main body and the holder are fitted to each other, the screw shaft is positioned, and the screw shaft is displaced by the ultrasonic vibration transmitted from the ultrasonic vibrator. Since the screw shaft is always arranged on the extension line of the vibration main shaft of the ultrasonic vibrator, the ultrasonic vibration is efficiently transmitted to the holder, and the cutting can be efficiently performed by the ultrasonic vibration.

(2) Since the second concave portion and the second convex portion are positioned by the surface of the holder opposite to the surface on which the cutting tool is attached and the surface where the horn body comes into contact, the cutting operation by the cutting tool Since the force applied to the surface of the holder on which the cutting tool is attached can be positioned and received by the second concave portion and the second convex portion, the angle and height of the cutting edge with respect to the ultrasonic vibrator of the cutting tool can be determined. Can be kept constant.

1 is a plan view of an ultrasonic cutting apparatus according to an embodiment of the present invention. It is a front view of FIG. 1A. It is a right view of FIG. 1A. It is the top view to which the principal part of the ultrasonic cutting apparatus of FIG. 1A was expanded. It is a front view of FIG. 2A. It is a right view of FIG. 2A. It is a top view of the holder of FIG. 2A. It is a front view of FIG. 3A. It is a right view of FIG. 3A. It is a top view of the ultrasonic horn of Drawing 2A. FIG. 4B is a front view of FIG. 4A. FIG. 4B is a right side view of FIG. 4A. It is a top view of the attachment base of FIG. 2A. FIG. 5B is a front view of FIG. 5A. It is a right view of FIG. 5A.

  1A is a plan view of an ultrasonic cutting apparatus according to an embodiment of the present invention, FIG. 1B is a front view, and FIG. 1C is a right side view. 2A is an enlarged plan view of the main part of the ultrasonic cutting apparatus of FIG. 1A, FIG. 2B is a front view, and FIG. 2C is a right side view.

  As shown in FIGS. 1A to 1C, an ultrasonic cutting apparatus 1 according to an embodiment of the present invention includes a holder 2 that holds a machining tip 20 as a cutting tool, and an ultrasonic vibrator that excites ultrasonic vibration. 3, an ultrasonic horn 4 that transmits ultrasonic vibration excited by the ultrasonic transducer 3 to the holder 2, and an attachment as a base for attaching the ultrasonic horn 4 to the tool post 6 of the ultrasonic cutting apparatus 1 And a base 5.

  The ultrasonic transducer 3 is configured such that a piezoelectric element made of ceramic, for example, is sandwiched between positive and negative electrode plates, and the tip portion thereof serves as an output unit that functions as a mass point for amplifying ultrasonic vibration. In this ultrasonic vibrator, when the electrode plate is energized from the power supply unit, the piezoelectric element is activated, and the ultrasonic vibration of 20 kHz to 40 kHz with the axis direction (vibration main shaft 30) as the vibration direction is applied to the output portion. Excited. The ultrasonic vibration excited by the output unit is transmitted to the holder 2 via the support horn 4.

  3A is a plan view of the holder 2, FIG. 3B is a front view, and FIG. 3C is a right side view. The holder 2 is an integrally molded product made of tool steel. The holder 2 is fitted into a rectangular parallelepiped main body portion 21, a cylindrical first convex portion 22 that fits into a first concave portion 42 of the ultrasonic horn 4 described later, and a second concave portion 43 of the ultrasonic horn 4 described later. The rectangular parallelepiped second convex portion 23, the tip mounting portions 24a, 24b, 24c, and 24d to which the processing tip 20 is attached, and the screw insertion hole 25 through which the screw 7 for fastening to the ultrasonic horn 4 is inserted. And a through slot 26. The penetrating slot 26 is formed in the central portion including the node position where the axial position of the holder 2 does not change, and the ultrasonic vibration is smoothly processed by preventing mutual interference of the central portion including the node position of the holder 2. To the chip 20 for use.

  The first convex portion 22 has a cylindrical shape centered on the same axis as the main vibration axis 30 of the ultrasonic transducer 3. The screw insertion hole 25 is formed at the center of the first convex portion 22. By fitting the first convex portion 22 with the first concave portion 42 of the ultrasonic horn 4, the screw shaft of the screw 7 is disposed and positioned on the extension line of the vibration main shaft 30 of the ultrasonic transducer 3. It has become.

  The 2nd convex part 23 is for the mutual positioning of the horn main body 40 and the holder 2 of the ultrasonic horn 4 mentioned later, and is arrange | positioned on the outer side of the 1st convex part 22. FIG. In the present embodiment, the chip attachment portions 24a to 24d to which the processing chips 20 are attached are provided at the four corners of the surface opposite to the surface on which the second convex portion 23 of the holder 2 is provided. One of these acts on the workpiece W during cutting. The 2nd convex part 23 is positioned by the surface on the opposite side to the surface where the chip | tip 20 for a process which acts on the workpiece | work W at the time of this cutting is attached, and the surface where the horn main body 40 contact | abuts. .

  That is, as shown in FIGS. 1A to 1C, when the machining tip 20 acting on the workpiece W at the time of cutting is the tip attachment portion 24 a, the surface 27 a to which the machining tip 20 of the tip attachment portion 24 a is attached, The positional relationship between the surface 27b and the surface 43a is adjusted so that the surface 27b of the second convex portion on the opposite side is positioned by coming into contact with a surface 43a of a second concave portion 43 of the horn body 40 described later. . Even when the machining tip 20 attached to the tip attachment portion 24b having the attachment surface on the same surface as the tip attachment portion 24a acts on the workpiece W, the surface 27b is the surface 43a of the second recess 43 of the horn body 40. It is positioned by abutting on.

  In addition, the holder 2 can be turned 180 ° around the center of the screw insertion hole 25 by loosening or removing the screw 7, and the side on which the chip mounting portions 24 a and 24 b are provided. It is possible to reverse the side where the chip mounting portions 24c and 24d are provided. In this case, since the processing tip 20 attached to the tip attachment portions 24c and 24d acts on the workpiece W, the surface 28b of the second convex portion on the opposite side to the surface 28a to which the processing tip is attached. Is positioned by contacting the surface 43a of the second recess 43 of the horn body 40. As a result, when the machining tip 20 attached to the tip attachment portions 24a and 24b is worn, the holder 2 is turned 180 ° to remove the machining tip 20 attached to the tip attachment portions 24c and 24d. Can be used.

  4A is a plan view of the ultrasonic horn 4, FIG. 4B is a front view, and FIG. 4C is a right side view. The ultrasonic horn 4 is an integrally molded product made of tool steel. The ultrasonic horn 4 is fitted with a rectangular parallelepiped horn main body 40, a node flange 41 for fixing the horn main body 40 to the pedestal 6 via the mounting base 5, and the first convex portion 22 of the holder 2 described above. The first recess 42, the second recess 43 fitted to the second projection 23 of the holder 2, the female screw hole 44 to which the screw 7 is fastened, and the through slot 45. The penetrating slot 45 is formed in a central portion including a node position where the position of the ultrasonic horn 4 in the axial direction does not change, and prevents ultrasonic interference by preventing mutual interference in the central portion including the node position of the ultrasonic horn 4. Is smoothly transmitted to the holder 2.

  The holder 2 and the ultrasonic transducer 3 described above are respectively fixed to the two opposing surfaces 40 a and 40 b of the horn body 40. The node flange 41 is disposed on both outer sides of the two opposite surfaces 40c and 40d perpendicular to the surfaces 40a and 40b to which the holder 2 and the ultrasonic transducer 3 are fixed. In the node flange 41, two screw insertion holes 46 for fixing with the mounting base 5 and the screw 8 are formed side by side in the direction perpendicular to the vibration main shaft 30. The ultrasonic horn 4 is detachably fixed by screws 8 as fastening bodies at a plurality of locations in the contact surface 41 b of the mounting base 5 using the screw insertion holes 46.

  Further, these node flanges 41 are connected to the horn main body 40 by flange base portions 41a formed in a bowl shape on the surfaces 40c and 40d, respectively. The flange base 41a is formed at an intermediate position between the surface 40a to which the holder 2 of the horn body 40 is fixed and the surface 40b to which the ultrasonic transducer 3 is fixed. This intermediate position is a node position where the position of the horn body 40 in the axial direction does not change. Since the flange base portion 41a is formed thin and has independent deformability, the ultrasonic vibration transmitted to the horn body 40 can be prevented from leaking to the node flange 41.

  5A is a plan view of the mounting base 5, FIG. 5B is a front view, and FIG. 5C is a right side view. The mounting base 5 is an integrally molded product made of a tool steel formed in a substantially L shape. In the mounting base 5, four female screw holes 51 to which the above-described screw 8 is fastened are formed in the contact surface 50 that contacts the contact surface 41 b of the node flange 41 of the ultrasonic horn 4. Further, four screw insertion holes 53 through which screws 9 for fastening to the tool post 6 are inserted are formed on a surface 52 orthogonal to the contact surface 50.

  As described above, in the ultrasonic cutting apparatus 1 according to the present embodiment, the ultrasonic vibrator 3 is fixed to the one surface 40b of the horn main body 40, and the horn main body facing the surface 40b to which the ultrasonic vibrator 3 is fixed. The holder 2 holding the processing chip 20 is fastened and fixed to one surface 40a of 40 by a screw 7 in which a screw shaft is arranged on an extension line of the vibration main shaft 30 of the ultrasonic transducer 3. At this time, the first concave portion 42 and the first convex portion 22 provided in the horn main body 40 and the holder 2 are fitted to each other, whereby the screw shaft of the screw 7 is positioned. The screw shaft is not displaced due to the ultrasonic vibration, and the screw shaft is always arranged on the extension line of the vibration main shaft 30 of the ultrasonic transducer 3. Thereby, ultrasonic vibration is efficiently transmitted to the holder 2, and it is possible to cut efficiently by ultrasonic vibration.

  Moreover, since the 2nd recessed part 43 and the 2nd convex part 23 for the mutual positioning of the horn main body 40 and the holder 2 are provided in the outer side of this 1st recessed part 42 and the 1st convex part 22, the holder 2 is a horn main body. It is fixed in a state where it is always positioned with respect to 40. Therefore, the angle and height of the cutting edge with respect to the ultrasonic transducer 3 of the processing tip 20 held by the holder 2 are constant.

  The horn main body 40 fixed to the two surfaces 40a and 40b where the holder 2 and the ultrasonic transducer 3 are opposed is opposed to the surfaces 40a and 40b to which the holder 2 and the ultrasonic transducer 3 are fixed. Since the outer flanges 41 of the two surfaces 40c and 40d are fixed to the mounting base 5 by a plurality of screws 8 at a plurality of locations in the contact surface 41b between the flange 41 and the mounting base 5, the flanges to the mounting base 5 The angle 41 is constant regardless of the fastening degree of the screw 8.

  Therefore, in the ultrasonic cutting apparatus 1 according to the present embodiment, the angle and position of the holder 2 with respect to the mounting base 5 are constant regardless of the fastening degree of the screw 8, and the ultrasonic wave of the machining tip 20 held by the holder 2. It is possible to easily match the angle and height of the blade edge with respect to the vibrator 3. Such an angle and height alignment of the cutting edge of the machining tip 20 with respect to the ultrasonic transducer 3 is important for a cutting tool that does not rotate, and is important for realizing highly accurate machining.

  Further, in the ultrasonic cutting apparatus 1 according to the present embodiment, the second concave portion 43 and the second convex portion 23 include the surface 27b opposite to the surface 24a to which the processing chip 20 of the holder 2 is attached, the horn body 40, and the like. Is positioned by the contact surface 43a, so that during the cutting operation by the processing tip 20, the force applied to the surface 24a to which the processing tip 20 is attached is applied to the second concave portion 43 and the second convex portion. Therefore, the angle and height of the cutting edge with respect to the ultrasonic transducer 20 of the machining tip 20 can be kept constant, and high-precision machining can be performed.

  In the present embodiment, a substantially L-shaped attachment base 5 is used, but the shape of the attachment base 5 can be changed according to the arrangement of the tool post 6 and the workpiece W. Alternatively, it is possible to directly attach the ultrasonic horn 4 to the tool rest 6 by using the tool rest 6 as a base without using the attachment base 5.

  The ultrasonic cutting apparatus of the present invention and the ultrasonic horn used therein are useful as apparatuses for performing cutting such as turning and shaping by ultrasonically vibrating a cutting tool.

DESCRIPTION OF SYMBOLS 1 Ultrasonic cutting processing apparatus 2 Holder 3 Ultrasonic vibrator 4 Ultrasonic horn 5 Mounting base 6 Tool post 7, 8, 9 Screw 20 Processing tip 21 Main body part 22 First convex part 23 Second convex part 24a, 24b, 24c, 24d Tip mounting portion 25 Screw insertion hole 26 Through slot 30 Vibration main shaft 40 Horn main body 41 Node flange 41a Flange base 42 First recess 43 Second recess 44 Female thread hole 45 Through slot 46 Screw insertion hole 51 Female screw hole 53 Screw insertion hole

Claims (3)

A holder for holding a cutting tool;
An ultrasonic transducer for exciting the ultrasonic vibration;
A horn body having a rectangular parallelepiped shape, on which the holder and the ultrasonic transducer are fixed to two opposing surfaces, and a node flange for fixing the horn main body to a pedestal, the holder and the ultrasonic transducer being fixed Intermediate positions between a plurality of node flanges arranged on both outer sides of two opposing surfaces perpendicular to the surface to be fixed, a surface to which the holder of the horn body is fixed, and a surface to which the ultrasonic transducer is fixed A plurality of flange bases that are formed in a bowl shape on two opposing surfaces perpendicular to a surface to which the holder and the ultrasonic transducer are fixed, and that connect the plurality of node flanges to the horn body. The plurality of node flanges and pedestals have ultrasonic horns that are detachably fixed by a plurality of fastening bodies at a plurality of locations in these contact surfaces,
The horn body and the holder are fastened by a screw having a screw shaft disposed on an extension line of a vibration main shaft of the ultrasonic transducer, and are positioned around the screw for positioning the screw shaft. The first concave portion and the first convex portion to be fitted are provided, and the second concave portion and the second convex portion for positioning the horn main body and the holder are provided outside the first concave portion and the first convex portion. Ultrasonic cutting device.   2. The ultrasonic wave according to claim 1, wherein the second concave portion and the second convex portion are positioned by a surface of the holder opposite to a surface on which the cutting tool is attached and a surface on which the horn main body abuts. Cutting device.   A horn body having a rectangular parallelepiped shape, on which the holder of the cutting tool and the ultrasonic vibrator are fixed to two opposing surfaces, and a node flange for fixing the horn body to the base, the holder and the ultrasonic vibrator are A plurality of node flanges disposed on both outer sides of two opposing surfaces perpendicular to the surface to be fixed, a surface to which the holder of the horn body is fixed, and a surface to which the ultrasonic transducer is fixed A plurality of flange bases, which are intermediate positions and formed in a bowl shape on two opposing surfaces perpendicular to the surface to which the holder and the ultrasonic transducer are fixed, connect the plurality of node flanges to the horn body The plurality of node flanges and pedestals are detachably fixed by a plurality of fastening bodies at a plurality of locations within these contact surfaces, and the horn body and the holder are The screw shaft is fastened by a screw arranged on an extension line of the vibration main shaft of the wave vibrator, and includes a first concave portion and a first convex portion for positioning the screw around the screw; An ultrasonic horn comprising a second concave portion and a second convex portion for positioning the horn body and the holder on the outside of the first concave portion and the first convex portion.

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