JP2720036B2 - Ring dust core manufacturing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a ring-shaped dust core which is an electric component and serves as a magnetic path. Conventional technology Conventionally, silicon steel sheets have been used as magnetic materials for high-voltage equipment such as large transformers, generators, and electric motors. In particular, when high performance is required, strong cold rolling and recrystallization processing are used. A crystal whose magnetization easy directions are aligned, that is, a directional silicon steel sheet is used. Iron, nickel alloy (Permalloy), iron aluminum alloy (Alpalm), and the like are used for small transformers, reactors, magnetic shields, etc. for weak electricity, which emphasize characteristics. Further, an oxide magnetic material (e.g., ferrite) or a powder magnetic core is used for high waves, and a press molding device including a male mold and a female mold is used for the manufacturing apparatus. By providing a mechanism for applying an external magnetic field to the press molding device, it is possible to match the direction of easy magnetization of the powder with the direction of magnetization when using the dust core, and a dust core having a larger magnetic permeability can be obtained. Although it can be obtained, the apparatus becomes large, the control is complicated, and there is a problem in productivity. Problems to be Solved by the Invention In the conventional technology, the magnetic material was improved to improve the characteristics of the ring-shaped dust core, and a slight improvement was also made to the manufacturing apparatus. It was difficult to improve. The present invention has been devised for the purpose of imparting excellent performance to an oxide magnetic material or a dust core and improving productivity. Means for Solving the Problems A female mold having an annular groove for accommodating anisotropic ferromagnetic powder in an annular shape, and a projection adapted to the female annular groove, are pressed into the female mold from above, and the binder is inserted. A female mold for solidifying the added ferromagnetic powder, an ultrasonic vibrator connected to the female mold and applying vibration to float the ferromagnetic powder contained in the female annular groove, and a female annular groove A conductor that penetrates vertically through the center and induces lines of magnetic force when energized in the annular groove,
An apparatus for producing a ring-shaped dust core comprising a Sendai Tron or a DC power supply equivalent thereto, which instantaneously supplies a strong current prior to pressing. The upper end of the conductor is made of silver or an equivalent metal, and contacts the terminal before or during the male descent,
A strong current may be momentarily supplied immediately before pressing. In the apparatus for producing a ring-shaped dust core of the present invention, immediately before the powder is compacted into a ring, the silver terminal provided at the center of the female mold and the power supply terminal provided at the center of the male mold come into contact with each other,
It has a mechanism in which a strong current generated by the Sendai Tron flows instantaneously into the conductive wire, and the magnetic field lines induced by Ampere's right-hand rule align the easy axis of magnetization of each crystal in the circumferential direction. In addition to improving the magnetic permeability of the dust core, other properties of the magnetic material can be sufficiently exhibited. Therefore, the desired effect can be obtained instantaneously with a very simple device, so that productivity can be dramatically improved. The vibration generated by the ultrasonic vibrator brings a synergistic effect when used in combination with the Sendai Tron in order to improve the fluidity of the powder. EXAMPLES Hereinafter, an apparatus for manufacturing a ring-shaped dust core according to the present invention will be described. Reference numeral 1 denotes a female die, and an annular groove 3 for accommodating anisotropic ferromagnetic powder 2 such as Sendust (trade name) on its upper surface.
In addition, a silver conductive wire 4 is disposed at the center of the annular groove 3 so as to penetrate vertically. Reference numeral 5 denotes an ultrasonic vibrator, which comprises an ultrasonic sweep generator 6 and a vibrator 7 connected to the female mold 1. The ultrasonic sweep generator 6 generates ultrasonic waves of 10 to 30 KC to the vibrator 7, The female mold 1 is vibrated. Then, the anisotropic ferromagnetic powder 2 accommodated in the annular groove 3 is brought into a floating state. Reference numeral 8 denotes a female die, which has an annular projection 9 on the lower surface that is compatible with the annular groove 3 of the female die 1. When the male mold 8 descends, the power supply terminal 11 comes into contact with the silver terminal 10 protruding at the center of the female mold 1 and a strong current from the Sendai Tron 12 flows for a moment. Thus, magnetic lines of force are induced from the conductive wire 4 that passes through the center of the female annular groove 3 according to Ampere's right-handed screw rule. Since the crystals are in a floating state, the axes of easy magnetization of the respective crystals are easily aligned in the circumferential direction. Then, the male mold 8 descends and presses, solidifying the anisotropic ferromagnetic powder 2 together with the binder mixed in a state aligned in the same direction,
The ring-shaped dust core 13 is manufactured. The ultrasonic vibration device 5 sweeps the generated vibration so that the whole is in a floating state regardless of the size of the powder, and the easy axis of magnetization is easily aligned in the same direction. The DC power supply for flowing a strong current is not limited to the Sendai Tron 12, but may be replaced by another if it has the same performance. Effect of the Invention As described above, in the ring dust core manufacturing apparatus according to the present invention, the ring dust core can have not only characteristics several times better than conventional products of this kind but also an improvement in productivity. Therefore, the effect of the apparatus for producing a ring-shaped dust core of the present invention on an industrial scale is inevitable.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of an apparatus for manufacturing a ring-shaped dust core according to the present invention. FIG. 1 is a schematic side view of the apparatus, and FIG. 2 is an external perspective view of the ring-shaped dust core. FIG. 1 ... female type, 2 ... anisotropic ferromagnetic powder, 3 ... annular groove, 4
... conductive wire, 5 ... ultrasonic vibrator, 8 ... male type, 9 ...
… Circular protrusion, 12… Sendai Tron, 13… Ring dust core.

   ────────────────────────────────────────────────── ─── Continuation of front page                   (56) References JP-A-58-108713 (JP, A)                 JP-A-56-204 (JP, A)                 Actual development Sho57-204897 (JP, U)                 Tokiko 34-6038 (JP, B1)

Claims (1)

(57) [Claims] It has a female mold with an annular groove on the upper surface for accommodating anisotropic ferromagnetic powder in an annular shape, and a protrusion adapted to the female annular groove,
A male mold that presses into the female mold from above and solidifies the ferromagnetic powder to which the binder has been added, and an ultrasonic wave that is connected to the female mold and gives vibration to float the ferromagnetic powder contained in the female annular groove. Vibration device, a conductor that penetrates vertically through the center of the female annular groove, induces magnetic lines of force when energized in the annular groove, and Sendai Tron or it that instantly supplies a strong current to the conductor prior to pressing Ring-shaped dust core manufacturing equipment consisting of an equivalent DC power supply. 2. The upper end of the conductor is made of silver or an equivalent metal, contacts the terminal before or during the descent of the male mold and instantaneously supplies a strong current immediately before pressing. Equipment for manufacturing ring-shaped dust cores.