摘要:
A disc of piezoelectric ceramic with a plurality of parallel slots cut into a top surface. Another plurality of slots is cut into the bottom surface of the disc with the parallel slots on the top being perpendicular to the parallel slots on the bottom. For one application a shallow keyway slot is cut into the top and/or bottom surface, traversing the already cut slots, to serve as a receptacle for an electrode ribbon.
摘要:
Drilling apparatus for trepanning a difficult to work material. A drill member includes a very thin wall cylindrical cutting head integral with a shank portion, with the assembly being machined from the same piece of stock to insure concentricity. A fluid supply collar includes lower and upper Teflon washer inserts which surround the shank portions and which are held in place respectively by a shoulder of the cutting head and a chuck or other holder of a machine which rotates the drill member. Fluid supplied to the collar is directed through radial and axial passageways in the drill member to the lower margin thereof, and which lower margin includes a continuous abrading surface on the inside, outside and edge thereof. The length of shank extending from the holder is extremely short due to the dimension of the collar thereby resulting in high stiffness to insure for concentricity during drilling operations. A power down feed arrangement is provided so that the drill member is advanced into the workpiece at a predetermined constant rate.
摘要:
A cylindrical transducer for providing an omnidirectional beam pattern in one plane and a line radiation pattern in planes normal to the omnidirectional pattern. The cylindrical transducer active element is a radially poled piezoceramic having a surface into which a square thread is spirally cut so that only a pair of electrical leads are needed to excite the whole assembly. In one embodiment the thread is cut entirely through the thickness of the cylinder and in another embodiment it is cut partially through.
摘要:
A cylindrical piezoelectric high-strain ultrasonic driver made up of a plurality of ceramic rings is imbedded in the interior of a steel roller which is used in a rolling mill. Long service life is obtained from the ultrasonic piezoelectric transducer because of a close-fitting, thin-walled, brass tube epoxied into position inside the ceramic rings that make up the ultrasonic transducer. A spider facilitates connection between the brass tube and the power source.