JPH08309634A - Rotary oscillating jig holder - Google Patents

Abstract

PURPOSE: To provide a compact rotary oscillating jig holder at a low cost, which has the rigidity so as to securely give the oscillation to a jig fitted to an output shaft of a jig holder and of which output shaft is securely slid with a cam surface so as to obtain the predetermined oscillation. CONSTITUTION: An input shaft 1 supports an output shaft 6, which is inserted into an inner hole 3, freely to be slid in the axial direction and rotated with the input shaft 1. A pin hole 10 is provided at an intermediate part of the output shaft 6 at a right angle against the axis center of the output shaft 6. A pin 11 is tightly placed in the condition that the pin 11 is radially projected from the outer diameter of a large diameter part 12 of the output shaft 6 by the predetermined quantity, and the pin 11 can be slid with cam surfaces 29, 30, which are separately supported by the input shaft 1 and formed in a cover 21, and a small diameter ring 13 is fitted to a projecting part of the pin 11 freely to be rotated and freely to be slid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary vibrating tool holder for imparting vibration to the tool side particularly when performing highly efficient cutting or grinding by applying vibration.

[0002]

2. Description of the Related Art In machining for the purpose of cutting or grinding, when machining is performed while applying an appropriate relative vibration between a tool and a work material, the machining speed and machining accuracy are improved and the tool life is increased. It is known that a remarkable effect is recognized. As a vibrating device for giving this vibration, an electrostrictive or magnetostrictive vibrator is often used, and in addition, an electromagnetic vibration type, an electro-hydraulic type, a mechanical-hydraulic type, etc. are proposed. ing. Such a conventional vibration device is used only in a special field due to restrictions such as an expensive vibration generator and a tool shape that can resonate because the amplitude is amplified by the resonance action. Has been done. In recent years, in order to make it more versatile
The mechanical vibration table shown in Japanese Patent No. 256434 is disclosed as a vibration table that gives a vertical vibration to a work piece by combining a motor and a cam. Further, a mechanical vibration tool holder is 1988 Precision Engineering Society. It is disclosed in the Autumn Meeting Academic Papers, pp. 411-412, "Drilling Ceramics with Mechanical Vibration Tools," and in Japanese Patent Application No. Hei 5-62720, which has been filed by the applicant of the present application. The vibrating tool holder is attached to the spindle of a machine tool such as a machining center.When the spindle rotates, the tool is mounted on the tool by a cam ring built into the holder.
It gives downward vibration.

[0003]

The vibration table described above is
Since the structure is directly connected to the motor, there are problems that a considerable space is required and that the weight and size of a work piece that can be mounted are limited. On the other hand, the above-described conventional vibration holder has a structure in which the amplitude is small and the cam ring is pressed by a spring in order to alleviate mechanical shock. In these structures, depending on the processing conditions,
The output shaft may generate self-excited vibration, which may adversely affect machining accuracy. In addition, when the workpiece is constrained like a tool such as a drill or reamer, the force of the spring is smaller than the force of pushing the tool, so the output shaft does not reliably slide on the cam surface Was not obtained in some cases. The present invention
In order to solve such a problem, in the vibrating tool holder, it is assumed that the output shaft surely slides on the cam surface with rigidity so that the tool attached to the output shaft of the tool holder can be surely given vibration. An object of the present invention is to provide a compact and inexpensive rotary vibrating tool holder that can obtain vibration.

[0004]

For this reason, the present invention provides an input shaft mounted on a machine main shaft, and an output shaft that rotates with the input shaft and is slidably supported in the input shaft so as to grip a tool. A projection member that extends in a radial direction from the output shaft; a cover that surrounds the input shaft, is fixedly supported independently of the input shaft, and rotatably supports the input shaft through a bearing; A cam ring having a pair of corrugated cams that are in contact with each other and are supported by the cover and that are rugged in the axial direction along the circumferential direction; and when the machine spindle rotates, the tool is rotated above and below the tool spindle. The above-mentioned problems of the prior art are solved by providing a rotary vibrating tool holder characterized by vibrating.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1 which is a sectional view with a half portion cut away of a rotary vibration tool holder. The upper part of the input shaft 1 attached to the machine tool main shaft (not shown) has a handle 2, and the balls 5 put in the ball holes 4 above the internal hole 3 of the input shaft 1 are a plurality of balls provided above the output shaft 6. Engages with the spline-shaped ball groove 7 to support the output shaft 6 slidably in the axial direction and to rotate together with the input shaft 1. A tool mounting hole 8 matching the diameter of the handle of the tool is formed in the lower end of the output shaft 6, and a handle of a tool (not shown) to be used can be fixed by a set screw 9. Naturally, the shape and size of this mounting hole are determined by the handle shape of the tool used. In the middle of the output shaft 6, one or several pin holes 10 are formed in the direction perpendicular to the axis of the output shaft 6.

In the pin hole 10, the pin 11 has a large diameter portion of the output shaft 6.
It is hard-tightened with a predetermined amount radially protruding from the outer diameter of 12. The pin 11 can be slidably contacted with the cam surfaces 29, 30 formed on the cover 21, and preferably, a small diameter ring 13 is fitted to the protruding portion of the pin 11 so as to be rotatable around the pin 11. It is designed to be in sliding contact with the cam surface 29.30. A radial bearing is provided outside the small diameter portion 14 of the input shaft 1.
15, 16 are fixed by a nut 20 screwed into a male screw 19 provided at the lower end of the input shaft 1 which is assembled with the spacer rings 17, 18 sandwiched therebetween. A cover 21 surrounding the input shaft 1 and the output shaft 6 and supported independently of the input shaft 1 outside the radial bearings 15 and 16 rotatably supports the input shaft 1 via the radial bearings 15 and 16.

A dustproof seal 22 is built in the upper end of the cover 21, and a rotation stopping rod 23 is screwed and fixed to the outer periphery. The rotation preventing rod 23 is fixed to a machine spindle cover or the like (not shown), and fixedly supports the cover 21 so that it does not rotate even if the machine spindle rotates. A plurality of screw holes 24 are formed in the lower end of the cover 21, and the upper cam ring 25, the spacing ring 26, and the lower cam ring 27 are fixed to the cover 21 by tightening with hexagon socket head cap bolts 28. A corrugated cam surface 29 having a sinusoidal curved surface (which may be other corrugated surface) is provided on the lower end of the upper cam ring 25 in the axial direction along the circumferential direction. A corrugated cam surface 30 is provided on which a curved surface that is uneven in the axial direction is engraved. The upper corrugated cam surface 29 carved at the lower end of the upper cam ring 25 and the lower corrugated cam surface 30 carved at the upper end of the lower cam ring 27 are rotatably fitted to the pin 11 driven into the output shaft 6. It is assembled so that the ring 13 is sandwiched from above and below and is in sliding contact.

The positional relationship between the corrugated cam surfaces 29, 30 of the upper and lower cam rings is shown in the half-developed view of the corrugated cam surface of FIG. 2 (the right end is further formed with a symmetrical half thereof). As shown, the peaks and troughs of the corrugated cam surface 29 of the upper cam ring 25 are complementary to and face the troughs and peaks of the corrugated cam surface 30 of the lower cam ring 27. Further, since the gap is assembled to be slightly larger than the outer diameter dimension of the small-diameter ring 13 sandwiched between the upper and lower cam surfaces, the small-diameter ring 13 is arranged vertically between the corrugated cam surfaces along the corrugated cam surfaces. You can roll around while moving. Waveform reference line 3 for this cam surface 29, 30
2,33 are leveled. Since the rolling wavy cam surface of the small diameter ring is a sinusoidal curved surface with smooth irregularities, the mechanical shock during rolling is mitigated and smooth vibration is obtained, and the irregularity amplitude can be 100 μm or more. It is possible. Further, as shown in FIG. 3 which is a half-part development view of the wavy cam surface different from FIG. 2 (a half part which is symmetrical to this is continuously formed at the right end part), the cam surface 29 ', The amplitude per rotation can be further increased by inclining the wavy reference lines 34 and 35, which are formed by concave inclined lines, on the wavy reference line of the cam ring 30 '. The lower end 31 of the lower cam ring 27 is a dustproof seal.

Next, the operation will be described. The handle 2 is fixed to a machine tool spindle not shown, and when the spindle is rotated, the rotation is transmitted to the input shaft 1, and the ball 5 and the ball groove 7 contained in the ball hole 4 allow the input shaft 1 to move up and down. The rotation is transmitted to the output shaft 6 connected to
The pin 11 provided with the rotatable small diameter ring 13 provided on the output shaft 6 also rotates. Here, since the output shaft 6 can move up and down, the small-diameter ring 13 sandwiched between the upper and lower wavy cam surfaces transmits the up and down motion when rolling on the wavy cam surface to the output shaft 6. Therefore, the amplitude can be forcibly applied to a tool (not shown) attached to the output shaft 6. The magnitude of the amplitude is the magnitude of the unevenness of the corrugated cam surfaces 29, 30, 29 ', 30', and the frequency is the number of revolutions of the main shaft multiplied by the number of the unevenness of the corrugated cam. In addition, it is possible to increase the amplitude or reduce the mechanical impact of rolling of the small diameter ring 11 by using the corrugated reference line formed by the concave inclined line.

[0010]

As is apparent from the above description, when the main shaft of the machine tool used is rotated, the projecting member which is rotated by the tool and simultaneously projects from the output shaft is mounted on the output shaft by rolling the corrugated cam surface. Vertical vibration can be forcibly given to the tool, and firstly, vibration can be forcibly given to the tool, preventing deterioration of machining accuracy due to self-excited vibration or vibration failure, and stable operation. Machining accuracy is obtained. Secondly, since the amplitude of vertical vibration can be as large as 100 μm or more, the machining efficiency and tool life can be improved. Third, vertical vibration of the work material on the vibration table Compared with the method of providing the above-mentioned method, it is possible to obtain an excellent effect such as providing a very small and extremely inexpensive rotary vibration holder. Preferably, the protruding member is composed of a plurality of pins mounted on the input shaft and a small diameter ring rotatably fitted to the outer peripheral surface of the pin, and the cam surface has a sinusoidal waveform,
A smooth vibration was obtained by relieving mechanical shock, and further, the reference line of the corrugation of the corrugated cam surface was formed by a concave inclined line, whereby the amplitude per rotation could be further increased.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotary vibration tool holder according to an embodiment of the present invention with a half portion cut away.

FIG. 2 is a half-developed view of the corrugated cam surfaces showing the positional relationship between the corrugated cam surfaces 29 and 30 of the upper and lower cam rings shown in FIG. .

FIG. 3 is a half-part development view of the corrugated cam surface different from FIG. 2, in which a right half part is further formed with a half part continuous thereto.

[Explanation of symbols]

 1. ． Input shaft 6. ． Output shaft 11. ． Pin (projecting member) 13. ． Small diameter ring 15, 16. ． Bearing 21. ． Cover 25,27. ． Cam ring 29.30, 29 ', 30'. ． Wavy cam surface

Claims (3)

[Claims] 1. An input shaft attached to a machine main shaft, an output shaft that rotates with the input shaft and is supported by the input shaft so as to be slidable in the axial direction to hold a tool, and a protrusion that extends from the output shaft in a radial direction. A member, a cover that surrounds the input shaft, is fixedly supported independently of the input shaft, and rotatably supports the input shaft via a bearing, and is in sliding contact with the protruding member and is supported by the cover. A cam ring having a pair of corrugated cams that are concave and convex in the axial direction along the circumferential direction at intervals slightly larger than the outer diameter of the protruding member, and the tool rotates when the machine spindle rotates. A rotary vibrating tool holder characterized in that it vibrates upwards and downwards. 2. The projecting member is formed of a plurality of pins attached to the input shaft, and a small diameter ring rotatably fitted to the outer peripheral surface of the pin is provided, and as the output shaft rotates. , The pair of corrugated cam surfaces have sinusoidal curved surfaces and are spaced at a distance slightly larger than the outer diameter of the small diameter ring, and the small diameter ring fitted with the pin has the pair of corrugated cam surfaces. The rotary vibrating tool holder according to claim 1, wherein the rotary vibrating tool holder is configured to roll up and down while moving vertically. 3. The rotary vibration tool holder according to claim 1, wherein the corrugated reference line of the corrugated surface of the corrugated cam surface is formed by a concave slant line.