JPS60186369A - Ultrasonic spindle machining unit - Google Patents

Abstract

PURPOSE:To eliminate unexpected vibration of a tip end tool on a spindle shaft to aim at enhancing the machining accuracy of an article, by disposing radial bearings for preventing radial swinging motion, as a shockless means, between the outer housing of a machining unit and the spindle. CONSTITUTION:Unavoidable radial swinging motion or vibration in radially oblique directions upon transmission of vibration energy along a spindle shaft 1 by means of ultrasonic wave is surely eliminated by disposing bearings 5 each having a shockless measure to positions which indicate the zero point value of an ultrasonic wave length stroke. With this arrangement the ultrasonic vibration along the spindle is transmitted to the tip end tool with a best suitable condition while friction between the tool and a workpiece is reduced due to high speed rotation and a predetermined flexibility, and as well unexpected vibration is eliminated to surely and smoothly machine the workpiece so that the manufacturing accuracy of the workpiece may be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention eliminates unexpected run-out caused by ultrasonic waves to the grinding tool at the tip of the spindle shaft in various ultrasonic processing machines, and accurately extends the width in the axial direction. The present invention relates to an ultrasonic spindle processing machine that allows the phenomenon to be simulated.

Due to the remarkable technological innovations of recent years, various precision instruments and electrical appliances equipped with various types of push-button computers have been developed, and these products are achieving high quality and high performance.

Therefore, the various members and parts used in these devices are all required to be of high quality, and there is a strong demand for improvement in part precision.

Conventionally, various pieces and parts of this yuzu according to the present invention have been manufactured by cutting and drilling with a diamond tool to produce carbide materials such as high alumina, ceramics, ferrite, quartz, zirconium, sapphire, boron compounds, glass, etc. Machining from small holes to deep holes can be easily carried out, even for products made of brittle materials.

In this type of processing method, the rotational speed of the spindle shaft is usually increased to 5,000 rpm, and an ultrasonic oscillator is used to generate approximately 20 kilocycles of ultrasonic waves to obtain more constant mechanical vibration. Vibration was applied to the diamond tool, and the friction between the tool on the processing machine side and the workpiece was suppressed to the minimum limit by cutting with high-speed rotation and vibration, thereby measuring smoothness and efficiency.

However, the vibration caused by the ultrasonic frequency wavelength is extremely disadvantageous in that it causes not only the optimum vertical direction but also unavoidable lateral or radial vibration to the spindle shaft end tool from a macroscopic perspective. Due to the drawbacks, such as taper and variation in the fine hole diameter, it has been a significant impediment to improving accuracy.

The present invention focuses on the above-mentioned reasons, and as a result of continuous research, we have solved the problem at once by attaching a bearing to the spindle shaft in a seamless manner. It was designed to improve the accuracy of objects.

An embodiment of the ultrasonic spindle processing machine of the present invention that achieves the above object will be described below with reference to the drawings.

The drawing is a schematic explanatory diagram of the present invention, and shows an ultrasonic spindle processing machine having a drive motor M, an ultrasonic transmitter (not shown), and a control device (not shown) externally.

As shown in the figure, in this configuration, a spindle shaft 1, which is rotated at high speed (5,0OOrj, m) by a motor M as a drive source, is installed inside an outer body 6, and a tool mounting shaft 3 at the tip of the spindle shaft 1 is installed inside an outer body 6. A diamond tool 4 is attached and fixed to the tip, and this energy is transferred to the spindle shaft 1 rotating at high speed by a converter 2 that converts the frequency of an external ultrasonic oscillator (not shown) into mechanical vibration. caused by piezoelectric excitation during rotation, a constant frequency vibration is transmitted along the axis 1 to the tip tool 4, and its amplitude stroke, as if in concert, reaches a position where the zero point value of the wavelength is shown; The present invention is constructed by using a simple means to install a bearing 5 between the outer body 6 and the spindle shaft 1 to prevent radial rocking.

In this way, when the vibration energy along the axis caused by the ultrasonic wave is transmitted to the tip tool 4, the essential point of the present invention is the radial vibration that is difficult to avoid, that is, the radial vibration from a macroscopic perspective. Unexpected deflection in the diagonal direction is reliably absorbed and eliminated by installing the bearing 5 using a mechanical method at the location where the ultrasonic wavelength stroke shows the 0 point value. Therefore, an innovative ultrasonic spindle processing machine is constructed that does not require any modification to the functional design of the outer body 6 and the internal spindle shaft 1.

As described above, the ultrasonic vibration along the spindle axis is transmitted to the tip tool in the best possible condition, and the friction between the tool and the workpiece is reduced by high-speed rotation and constant stretching width pressure. The present invention, which can eliminate external run-out and perform accurate and smooth machining, has an extremely significant and significant effect in improving precision.

[Brief explanation of drawings]

The drawing is a schematic explanatory diagram showing the spindle axis of the ultrasonic spindle processing machine of the present invention. M-Motor. 1-Spindle shaft, 2-Ultrasonic converter, 3-Tool mounting shaft, 4-Diamond tool, 5-Bearing, 6-Outer body. The associated wavy lines represent the wavelengths of ultrasound waves. Patent applicant Toshimasu Eguchi

Claims (1)

[Claims] A power source, an ultrasonic oscillator, and a control device The spindle shaft of the ultrasonic spindle processing machine, which is installed inside the outer body and rotates at high speed, has a constant ultrasonic frequency by piezoelectric excitation during rotation. This is an ultrasonic spindle processing machine that causes the tip tool to resonate along the axis, causing a phenomenon of elongation in the vertical direction, and performs machining while rotating at high speed. In the method of eliminating the lateral unexpected amplitudes that appear, the ultrasonic frequency is applied to the spindle axis by a constant amplitude stroke to a zero point value at the wavelength, by means of mechanical means. By installing a bearing to prevent radial rocking between the outer body and the spindle shaft, it is possible to eliminate unexpected damage to the tip tool of the spindle shaft and accurately prevent the width expansion phenomenon. This is an ultrasonic spindle processing machine that is characterized by: