| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Research Abstract |
1. Establishment of Layleith wave propagating method The propagation of Layleigh wave on the drawing die was conducted as follows. The vibration, which originates at a piezo by high-frequency electric supply and grows up by a horn, reaches on the die front. This vibration propagates in the die to the rear and another combination of a horn and a piezo. In this piezo the mechanical vibration converts to the electrical vibration and then the electrical energy consumes in the electrical resistor. In order to compensate tne capacitance of piezo vibrator, the inductance of L=7.25 mH was connected. The value of the resistor is R=2,157 Ohms, taking account of the mechanical and electrical impedance matching.
2. Drawing equipment the drawing equipment mainly consists of die, draw bench, oscillating circuit, computer control and measuring part. The drawing force was detected by the deformation on the strain gage which was putted on the beam type load cell in the chuck and the traveling distance was detected as revolution of driving motor by tachometer.
3. The blank wire was the annealed 7/3 brass, and the working conditions were the die-semi angle of 0,5 , the reduction of 12 % and ultrasonic nominal frequency of 20 KHz. Furthermore, the process changed among the conventional one and the ones with normal and reverse Layleigh waves and drawing speed varied. Under these conditions tests were carried out and followings were clarified. (1) It is the desirable effect of Layleigh wave on the drawing process that the drawing stress decreased by this wave. (2) The drawing stress kept constant in the process with normal Layleigh wave. (3) The faster the drawing speed, the drawing stress decreased.
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