JP2009269152A - Holder for ultrasonic machining tool and ultrasonic machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve machining accuracy when mounting an ultrasonic machining tool to an ultrasonic machining device using a tool holder having a tool insertion part at the tip end and a slit which is continued to the tool insertion part and divides the tip end, and to enable ultraprecision machining. <P>SOLUTION: The ultrasonic machining holder includes the tool insertion part 10 having a tool 2 to be inserted at the tip end of the holder 1 and the slit 11 which is continued to the tool insertion part 10 and divides the tip end. The slit 11 is in a surface approximately parallel to an axis center of the holder 1, and the depth form the tip end surface of the holder 1 is 1/8 to 1/5 of a machining ultrasonic wavelength. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ultrasonic processing tool holder for attaching an ultrasonic processing tool to an ultrasonic processing apparatus, and an ultrasonic processing apparatus using the same.

  Conventionally, in an ultrasonic machining apparatus, the ultrasonic machining tool is integrated by brazing the tip of the ultrasonic machining horn, but brazing the ultrasonic machining tool is troublesome. In addition, in the case of brazing, replacement work of a worn ultrasonic machining tool is very troublesome and troublesome. Therefore, instead of this brazing means, for example, a fixing means as described in Patent Document 1 has been proposed.

  In the ultrasonic processing apparatus described in Patent Document 1, a tool insertion portion is provided at the tip of the horn, and a first groove that divides the horn connected to the tool insertion portion is configured. The dividing groove is in a plane substantially parallel to the axis of the horn, and the length thereof is set to about 1/4 or more of the wavelength of the applied ultrasonic wave. And according to this ultrasonic processing apparatus, it comes to be considered to be close to the state in which two horns having substantially the same vibration characteristics are connected in parallel to the cone, and impedance matching with the oscillator is easy. It is said that even during strong excitation, the bonding strength of the tool is high, the vibration characteristics are good, the power factor is not reduced, and stable operation can be obtained.

Japanese Patent Publication No.7-14584

  However, when using a horn with a tool insertion portion provided at the tip and a split groove connected to the tool insertion portion in this way, the tip of the ultrasonic processing tool is compared with the brazed one. The amplitude of the part tends to increase. Thus, when the amplitude of the ultrasonic machining tool tip increases, the machining accuracy deteriorates, making it impossible to perform micron-order ultraprecision machining.

  Therefore, in the present invention, the tool for ultrasonic processing is superposed using a tool holder provided with a tool insertion portion at the tip portion and provided with a slit that is connected to the tool insertion portion and divides the tip portion. The object is to improve the processing accuracy when attached to a sonic processing device and enable ultra-precision processing.

  The ultrasonic processing tool holder of the present invention is an ultrasonic processing tool holder for attaching an ultrasonic processing tool to an ultrasonic processing apparatus, and the tool insertion in which the ultrasonic processing tool is inserted at the tip portion. And a slit that divides the tip portion into the tool insertion portion, and the slit is in a plane substantially parallel to the axis of the ultrasonic processing tool holder, and the ultrasonic processing tool holder The depth from the front end surface is not less than 1/8 and not more than 1/5 of the wavelength of the processing ultrasonic wave.

  The ultrasonic machining apparatus of the present invention is an ultrasonic machining apparatus in which an ultrasonic machining tool is attached via an ultrasonic machining tool holder, and the ultrasonic machining tool holder A tool insertion portion into which a machining tool is inserted, and a slit that is connected to the tool insertion portion and divides the tip portion, and the slit is in a plane substantially parallel to the axis of the ultrasonic machining tool holder. The depth from the tip surface of the ultrasonic processing tool holder is 1/8 or more and 1/5 or less of the wavelength of the processing ultrasonic wave.

  In the tool holder for ultrasonic processing according to the present invention, the depth of the slit connected to the tool insertion portion is set to 1/8 or more and 1/5 or less of the wavelength of the processing ultrasonic wave. When the machining tool is attached to the ultrasonic machining apparatus, the machining accuracy is improved, and ultra-precision machining can be performed.

  1 is a front view of a main part of an ultrasonic processing apparatus according to an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a front view of the ultrasonic processing tool holder of FIG. FIG. 4 is a right side view of FIG. 3.

  As shown in FIGS. 1 and 2, in the ultrasonic machining apparatus according to the embodiment of the present invention, an ultrasonic machining tool holder (hereinafter referred to as “holder”) 1 is connected to the tip of an ultrasonic horn H. It is fixed. A tool insertion portion 10 into which an ultrasonic processing tool (hereinafter referred to as “tool”) 2 is inserted, and a slit 11 that is connected to the tool insertion portion 10 and divides the tip portion into two at the distal end portion of the holder 1. And are formed.

  As shown in FIG. 3, the slit 11 is in a plane substantially parallel to the axis C of the holder 1, and the depth L from the front end surface (right end surface in FIG. 3) of the holder 1 is determined by the ultrasonic processing apparatus. It is set within the range of 1/8 ≦ λ ≦ 1/5 with respect to the wavelength λ of the processing ultrasonic wave. The tool insertion portion 10 is a bottomed round hole formed so that its depth B is shallower than the depth L of the slit 11.

  Further, at the tip of the holder 1, a bolt 3 is tightened in a direction to close the slit 11 to fix the tool 2 to the tool insertion portion 10, and a bolt hole 13 into which the body of the bolt 3 is inserted. And a counterbore hole 14 to which the head of the bolt 3 is fixed. The female screw hole 12, the bolt hole 13, and the counterbore hole 14 are provided in a total of two positions at symmetrical positions around the axis C of the holder 1. The tool 2 is inserted to a position where it abuts against the bottom of the tool insertion portion 10, and is fixed to the holder 1 by inserting two bolts 3 from the counterbore holes 14 and tightening them into the female screw holes 12.

  In the ultrasonic machining apparatus according to the above-described embodiment, the amplitudes of the longitudinal vibration and the lateral vibration of the tip portion of the tool 2 were measured. The used holder 1 is made of an aluminum round bar having an outer diameter of 22A (nominal diameter), and the depth L of the slit 11 is 18 mm (1/8 ≦ λ ≦ 1/5; λ = 126). A round bar having a diameter of 3 mm was used as the tool 2. As comparative examples, a slit depth L of 31.5 mm (λ> 1/5) (Comparative Example 1) and 15 mm (λ <1/8) (Comparative Example 2) were used.

Table 1 shows the measurement results. In Table 1, the vertical axis represents the amplitude in the direction of the axis C, the horizontal 0 ° is parallel to the slit 11 and the amplitude in the direction perpendicular to the axial center C (the horizontal direction in FIG. 2), and the horizontal 90 ° is And the amplitude in the direction perpendicular to the axis C (vertical direction in FIG. 2).

  From Table 1, when the depth L of the slit 11 of Example 1 is 1/8 ≦ λ ≦ 1/5, both the horizontal 0 ° and the horizontal 90 ° are within an amplitude of about 1 μm, which is over a micron order. It was confirmed that precision machining was possible. In the case of Comparative Examples 1 and 2, the amplitude at 0 ° in the horizontal direction is greatly different from that in Example 1. In either case, it is impossible to perform micron-order ultraprecision machining. It could be confirmed.

  INDUSTRIAL APPLICABILITY The present invention is useful as an ultrasonic processing tool holder and an ultrasonic processing apparatus for performing micron-order ultraprecision processing using ultrasonic vibration.

It is a front view of the principal part of the ultrasonic processing apparatus in embodiment of this invention. It is a right view of FIG. It is a front view of the tool holder for ultrasonic processing of FIG. FIG. 4 is a right side view of FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holder 2 Tool 3 Bolt 10 Tool insertion part 11 Slit 12 Female screw hole 13 Bolt hole 14 Counterbore hole

Claims (2)

An ultrasonic processing tool holder for attaching an ultrasonic processing tool to an ultrasonic processing apparatus,
Provided at the tip portion with a tool insertion portion into which the ultrasonic processing tool is inserted, and a slit that divides the tip portion connected to the tool insertion portion,
Further, the slit is in a plane substantially parallel to the axis of the ultrasonic machining tool holder, and the depth from the tip surface of the ultrasonic machining tool holder is 1/8 or more of the wavelength of machining ultrasonic waves. / 5 or less, a tool holder for ultrasonic machining. An ultrasonic processing apparatus in which an ultrasonic processing tool is attached via an ultrasonic processing tool holder,
The ultrasonic processing tool holder includes a tool insertion portion into which the ultrasonic processing tool is inserted at a distal end portion, and a slit that is connected to the tool insertion portion and divides the distal end portion.
Further, the slit is in a plane substantially parallel to the axis of the ultrasonic machining tool holder, and the depth from the tip surface of the ultrasonic machining tool holder is 1/8 or more of the wavelength of machining ultrasonic waves. / 5 or less ultrasonic processing apparatus.

Images