JP2014065075A - Ultrasonic vibration device using a plurality of rotary longitudinal vibration cylinders - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large capacity ultrasonic vibration device, uniform in the relative vibrational amplitude distribution between a plurality of rotary vibration cylinders capable of vibration processing of a wide sample for various strong ultrasonic wave applications.SOLUTION: Cylinders 1 and 2 driven by a longitudinal vibration device and vibrating in the longitudinal and radial direction, are deviatively installed by about 1/4 wave length of longitudinal vibration, and are formed in a structure for continuously vibrationally processing a thin film and a thin plate sample of various materials 7 inserted between the vibration cylinders 1 and 2 by relative vibration amplitude of the longitudinal and radial directional vibration along the cylinders 1 and 2 between the cylinders 1 and 2 by rotating the vibration cylinders 1 and 2 in a state of impressing static pressurization force. The relative vibration distribution is further uniformized by joining a plurality of these rotary vibration cylinders, and vibration capacity is also increased.

Description

Detailed Description of the Invention

  The present invention is a large-capacity ultrasonic vibration device that continuously vibrates (welding, cutting, polishing, cutting, plastic working, etc.) a wide plastic sheet, plastic net, metal thin plate, ceramics, thin film laminated part, multi-laminated thin film part, etc. About.

Conventionally, as an ultrasonic vibration device, an ultrasonic plastic welding device or various ultrasonic vibration processing devices using a single vibration device that applies a vertical or parallel vibration to a workpiece is known.
The conventional technology applies vibration to a processed sample using a single longitudinal vibration device.

Problems to be solved by the invention

  However, in the prior art, there is a limit to the size of the vibration tool because a single vibration device is used, and vibration is applied from one side of the vibration processing sample, so that vibration can be efficiently and continuously applied to a wide and long processing sample. It is difficult to provide energy and the range of application is limited.

  Therefore, in order to enable continuous vibration processing of various materials such as wide plastic sheets, nets and metal thin films, an ultrasonic vibration device capable of ultrasonic processing such as plastic welding and plastic processing of various materials has been desired. It was.

  The object of the present invention is to install a plurality of long vibration cylinders of several wavelengths or longer that vibrate longitudinally and radially, insert a sample between the cylinders, apply a static pressure, and apply relative vibration from both the upper and lower surfaces of a wide sample. Another object of the present invention is to provide a large-capacity ultrasonic vibration device that rotates a cylinder and continuously performs vibration processing, has a uniform relative vibration amplitude and good vibration application efficiency.

Means for solving the problem

  In order to solve this problem, the present invention applies a longitudinal vibration and a radial vibration from above and below the sample while inserting a vibration processing sample between two vibration cylinders and applying a static pressure. Vibration processing is performed by relative longitudinal vibration and relative radial vibration, but the relative vibration along the length of the vibration cylinder is set by shifting the position of the two vibration cylinders by shifting the length of the longitudinal vibration by 1/4 wavelength. The inventors have found that a substantially uniform relative vibration amplitude distribution can be obtained by alternately driving the cylinder in the same phase and in the opposite phase.

  According to the first aspect of the present invention, the positions of the two vibration cylinders are shifted by about a quarter wavelength length of the longitudinal vibration, and the vibration phases of the two cylinders are alternately driven with the same phase and the opposite phase at an appropriate period. As a result, the relative vibration amplitude between the two vibration cylinders becomes substantially uniform along the length of the vibration cylinder, and the relative longitudinal vibration amplitude and radial direction of the processed sample from above and below over the entire length of the vibration cylinder excluding the end. This is a large-capacity ultrasonic vibration device having a structure in which vibration amplitude is applied and a vibration cylinder is rotated to perform uniform continuous vibration processing.

  According to a second aspect of the present invention, in addition to the first aspect of the invention, for the purpose of alternately driving the vibration phases of the two cylinders in the same phase and the opposite phase, the resonance frequencies of the vibration cylinders are slightly different from each other. This is a large-capacity ultrasonic vibration device having a structure in which the vibration phase difference of the vibration cylinder is changed at ΔfHz to obtain substantially uniform longitudinal and radial vibration distribution along the vibration cylinder.

The invention of claim 3 has a large capacity in the structure of the invention of claim 1 in which two or more vibration cylinders are arranged at different positions to obtain a more uniform longitudinal and radial vibration distribution along the vibration cylinder. This is an ultrasonic vibration device.

Action

となり、上下の振動速度が１／２になることにより、必要な全パワは１／２になる。実際にも有効な結果が得られている。
この効果は２個の振動シリンダーで振動を印加する場合にも同様でより有効な振動加工効果が得られる。振動方向が試料に平行および垂直方向な振動を上下から同時に印加した場合にも有効な効果が得られている。When ultrasonic vibration of plastic material is applied by ultrasonic vibration and vibration is applied from the top and bottom of the welded sample at the same frequency and in opposite phase using two vibration devices, the welding strength is determined by the sum of the top and bottom vibration speeds, It is known that when the upper and lower vibration speeds are Vu and VL, the necessary vibration speed Vr is Vr = Vu + VL.
When a single vibration source is used, if the load resistance of the weld is RL, the power P required for welding is P = (1/2) Rl ^* Vr ² when vibration is applied simultaneously from above and below. Is the required power PuL when 1/2 Vu = VL = Vr / 2 when the vibration is applied from one side to the upper and lower required vibration speeds Vu and VL.

Thus, when the vertical vibration speed is halved, the total power required is halved. In fact, effective results have been obtained.
This effect is the same when a vibration is applied by two vibration cylinders, and a more effective vibration machining effect can be obtained. An effective effect is also obtained when vibrations whose vibration directions are parallel and perpendicular to the sample are simultaneously applied from above and below.

When the diameter of the longitudinal vibration cylinder is smaller than 1/4 of the longitudinal vibration wavelength λ, the vibration in the diametrical direction is small, but when it is larger than λ / 4, it is more than half of the longitudinal vibration amplitude. It vibrates with the vibration amplitude of. The vibration distribution according to the position x of the longitudinal vibration cylinder is the longitudinal vibration amplitude distribution ξl = Alcos (kx) · sin (2πft + θ) (m)
Radial vibration amplitude distribution ξr = Arsin (kx + π / 2) · sin (2πft + θ) (m)
It becomes. Here, Al and Ar are vibration amplitudes, κ is a wavelength constant, f is a frequency, and t is time.
When two longitudinal vibration cylinders are combined at the same position, the relative vibration amplitude between the vibration cylinders is 0 depending on the location even if the vibration phase difference is changed by 180 °.
Two longitudinal vibration cylinders are installed with a shift of about 1/4 wavelength (π / 2) of the longitudinal vibration, and the vibration phase difference is changed over time by 180 °, so that a substantially uniform relative vibration amplitude distribution between the cylinders can be obtained. can get.

  Instead of changing the driving phase difference of one of the vibrating cylinders by 180 ° over time, changing the resonance frequency of the two vibrating cylinders by Δf changes the vibration phase by Δf times, resulting in a substantially uniform cylinder A relative vibration amplitude distribution is obtained.

Therefore, a large-capacity continuous ultrasonic vibration machining apparatus having a large capacity can be provided by processing fine anti-slip irregularities with appropriate longitudinal vibrations, vibration machining patterns, and the like on the surface of the vibration cylinder.

  FIG. 1 is a block diagram showing the principle of a large-capacity ultrasonic vibration apparatus that performs continuous vibration processing of a wide sample according to the present invention, and FIGS. 2 and 3 are radial directions when the diameter of an aluminum alloy longitudinal vibration cylinder is thin and thick. Fig. 4 shows an example of the vibration distribution measured by a laser Doppler vibrometer. Fig. 4 shows the longitudinal vibration and radial vibration amplitude distribution in the case of two vibration cylinders installed with a shift of 1/4 wavelength of the longitudinal vibration. Fig. 5 shows calculated values of longitudinal vibration and radial vibration amplitude distribution when the vibration phases of two vibration cylinders installed with a ¼ wavelength length shift of longitudinal vibration are temporally changed by 180 ° and the sum is taken. Therefore, uniform vibration machining is possible with a fluctuation of about 25%.

  As shown in FIG. 1, each vibration cylinder (1) (2) is driven at one end by a longitudinal vibration drive device (3) (4) and the other end is a passive longitudinal vibration system (5) capable of holding and rotating the cylinder. (6) is installed. The longitudinal vibration drive device is a longitudinal vibration system composed of a bolted Langevin type vibrator (BLT) (11) and a speed-transforming horn (12), and the vibration node portion of the speed-transforming horn is a cylindrical node having a quarter-wavelength longitudinal vibration It is supported by a supporter (13), and the other end of the node supporter is installed on a metal base (14) that reflects vibration energy of the supporter with a larger acoustic impedance and mass than the node supporter. Further, a slip ring {circle over (15)} for supplying power to the ultrasonic vibrator at the time of rotation is installed at the rear of the vibration source. The passive vibration system (6) is also provided with a cylindrical node supporter (13) and a metal base (14) in the longitudinal vibration system (6). Since this metal base (14) hardly vibrates, it can be used for holding and rotating. The vibration cylinder can hold the node near the end with a 1/4 wavelength node supporter with a roller. If the mass of the vibration cylinder is not too large, it will not be supported by the node supporter, and this part can be used to expand the width that can be vibrated.

In FIG. 1, the longitudinal vibration drive device (4) (6) and the passive vibration device (5) (6) are installed at different ends of the vibration cylinder, but depending on the dimensions of the vertical vibration drive device, they can be installed on the same side. Further, in order to further increase the vibration capacity, longitudinal vibration drive devices can be installed at both ends to drive in parallel.

FIGS. 2 and 3 show that a 50 mm and 110 mm diameter, 515 mm long aluminum alloy rod is driven with a longitudinal vibration amplitude of 12.3 μm (single vibration amplitude), and oscillated by two wavelengths along the length to obtain a radial vibration amplitude. It is the result measured with a laser Doppler vibrometer. When the diameter is increased, the sound speed is decreased and the resonance frequency is different. However, when the diameter is 50 mm, which is slightly narrower than a quarter wavelength of the sound speed, the radial vibration amplitude is about 2.4% of the longitudinal vibration. For a diameter of 110 mm, which is nearly twice the / 4 wavelength, a radial vibration amplitude of about 50% is obtained.
Let

  In the case of a soft processed sample, when vibration (radial vibration) perpendicular to the specimen is effective (vertical vibration), it is possible to select a vibration cylinder with a more effective vibration mode by selecting the material and diameter of the vibration cylinder. Is possible.

  Assuming that the resonance frequency of two aluminum alloy vibrating cylinders with a diameter of 105 mm is Δf = 300 Hz and 19.35 kHz and 19.65 kHz, the length of each vibrating cylinder in the case of a longitudinal vibration of 13.5 wavelengths uses the measured value of sound velocity. Thus, 3,263.1 mm and 3,323.5 mm are obtained, and the vibration processing width is about 3,000 mm. Although the total length is slightly different, the relative vibration amplitude distribution is not greatly affected by averaging the installation positions over the entire length. This aluminum alloy vibrating cylinder having a diameter of 105 mm vibrated uniformly over the entire length with a longitudinal vibration amplitude of 15 μm or more by driving one end of the cylinder. The radial vibration amplitude is about 50% of the longitudinal vibration.

  Stainless steel, steel, and aluminum alloy can be used as the material of the vibration cylinder, but in the case of aluminum alloy, surface treatment such as hard anodized and hard chrome plating is applied after processing a non-slip groove on the surface to increase durability. Can be made.

  Depending on the type of sample, the effect of vibration processing varies depending on the magnitude of the static pressure, but when the vibration cylinder is placed vertically, the optimum static pressure can be achieved by using the weight of the upper cylinder, spring or air cylinder, etc. Can be applied.

  In the above example, a solid cylinder is used, but in order to reduce the weight, a hollow pipe-like vibrating body can also be used.

Effect of the invention

  As described above, according to the present invention, it is possible to obtain a large-capacity ultrasonic composite vibration device that is rich in rigidity of a vibrating body that continuously and uniformly vibrates a wide processed sample.

  FIG. 1 is a block diagram showing the principle of an ultrasonic vibration device in which vibration cylinders are installed in the upper and lower parts of the present invention.   FIG. 2 is a measurement example of the radial vibration distribution along a 50 mm vibration cylinder whose vibration cylinder diameter is close to the longitudinal vibration quarter wavelength.   FIG. 3 is a measurement example of the radial vibration distribution along a 110 mm vibration cylinder whose vibration cylinder diameter is close to twice the longitudinal vibration quarter wavelength.   2 shows a longitudinal vibration distribution and a radial vibration distribution in which two vibration cylinders are installed with the longitudinal vibration 1/4 wavelength position shifted.   FIG. 6 shows longitudinal vibration and radial vibration amplitude distributions when the vibration phases of two vibration cylinders installed by shifting the length of a quarter wavelength of the longitudinal vibration are 180 ° temporally and summed.

▲ 3 ▼ Vertical and radial vibration cylinders rotating several wavelengths above and below, arranged in the top and bottom ▲ 3 ▼ ▲ 4 ▼ Longitudinal vibration drive device powered by slip ring for driving vibration cylinders ▲ 5 ▼ ▲ 6 ▼ Holding vibration cylinders And passive vibration system for rotational drive (7) Welded or vibration processed specimens of plastic or other thin film or thin plate shape (8) Static pressure applied to welded part (9) Vibration cylinder rotation direction (10) Longitudinal vibration 1/4 Wavelength length vibration cylinder node roller supporter (11) Ultrasonic transducer (BLT)
▲ 12 ▼ Vibration velocity transformation horn ▲ 13 ▼ Longitudinal vibration 1/4 wave length cylindrical node supporter for holding longitudinal vibration system ▲ 14 ▼ Mass part for holding node supporter ▲ 15 ▼ Slip ring for feeding ultrasonic transducer ▲ 15 ▼ 'Ultrasonic vibrator power supply cable

Claims (3)

    Longitudinal and radial cylinders (1) and (2) driven by a longitudinal vibration source are installed with a shift of 1/4 wavelength of the longitudinal vibration, and the vibration phase is changed by the longitudinal vibration drive devices (3) and (4). Thin films of various materials inserted between the vibration cylinders {1} and {2} with the relative vibration amplitude of the longitudinal and radial vibrations along the cylinder between the cylinders {1} and {2} made uniform Ultrasonic vibration with a structure that continuously vibrates with high efficiency by applying vibration from both sides of the vibration processing sample by rotating the vibration cylinder while applying a static pressure (8) to the thin plate sample (7) apparatus   2. The large-capacity ultrasonic vibration device according to claim 1, wherein two vibration cylinders having slightly different resonance frequencies are used to change the vibration phase according to the difference between the resonance frequencies to make the relative vibration amplitude uniform.   2. The large-capacity ultrasonic vibration device according to claim 1, wherein a plurality of these vibration vibration cylinder device positions are changed and combined to further increase the vibration capacity with a uniform relative vibration distribution.

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