JP2018198296A - Rotary transformer - Google Patents

Abstract

To provide a configuration of a rotary transformer capable of replacing a tool for granting ultrasonic vibration by an ultrasonic vibrator using an automated tool replacing device.SOLUTION: Since a stator 3 is accommodated in an empty space of a machining center, it is necessary to be deformed according to the space. Therefore, a shape of the core is made to be a bent rod shape at an almost right angle. A rotor 2 includes a coil that is a core 4 made of soft ferrite and wound by a copper wire 5 for a plurality of turns. A shape of the core 4 of the stator 3 is prepared from a flat board made of soft ferrite using a processor of the machining center. One end section of the flat board is subjected to cut out processing with a curvature radius larger than the radius of the core 4 of the rotor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary transformer for supplying electric power to an ultrasonic transducer.

  In general, a rotary transformer is used to transmit input / output signals of a rotary head in, for example, a video tape recorder, and is composed of a rotor and a stator. As this rotary transformer, a flat type (disk type) and a vertical type (cylinder type) are known.

  However, the conventional rotary transformer has an annular shape or a fan shape in which both the rotor and the stator are centered on the rotation axis of the rotary transformer.

  FIG. 6 is a cross-sectional view showing a configuration example of a conventional rotary transformer that transmits power in the direction of the central axis described in Patent Document 1, and FIG. 7 is a longitudinal view that transmits power in the conventional radial direction. It is sectional drawing which shows the structural example of a rotary transformer of a type | mold. The rotor of the rotary transformer shown in FIGS. 6 and 7 includes two parallel magnetic field lines. There are also two lines of magnetic force that are parallel to the stator of the rotary transformer. A copper wire is wound a plurality of times in a groove that forms two lines of magnetic force that are parallel to both the rotor and the stator.

  An example in which the conventional rotary transformer is attached to a tool holder is described in Patent Document 2.

JP-A-5-90052 JP 2010-194613 A

Japan Electronic Machinery Manufacturers Association, "Ultrasonic Engineering", Corona, January 1993, p40-p58

  However, the configuration of Patent Document 1 requires that both the rotor and the stator are annular, the center axes of the rotor and the stator are coincident, and the two are close to each other. For example, if the stator has an annular shape and the rotor has an accessory such as a taper shank that is a tool holder, the stator becomes an obstacle and the rotor and an accessory such as a taper shank that is a tool holder are attached to the rotor. And the center axis of the stator cannot be moved to the same position.

  Moreover, since it is necessary to attach a stator to a housing, the structure of the said patent document 2 must modify the rotating shaft housing of the existing processing apparatus.

  The present invention has been invented in view of the above-described conventional problems, and an object of the present invention is to provide a configuration in which a tool holder can be replaced using an automatic tool changer of a machining center.

The present invention provides a rotary transformer in which the rotor has an annular shape and the stator has a bent rod shape.

The present invention also provides a rotary transformer in which the front end surface of the stator facing the rotor is 180 degrees or less of the annular rotor.

In the present invention, the tip end face shape of the stator facing the rotor is a flat shape.

The present invention also has a rotor in a tool holder that is moved by an automatic tool changer.

By using the rotary transformer of the present invention, it is possible to change a tool provided with ultrasonic vibration by an automatic tool changer.

It is a perspective view which shows the rotary transformer of this invention. It is a figure which shows the cross section in the AA of FIG. It is a top view which shows the rotary transformer of this invention. It is a figure which shows the cross section in the AA of FIG. It is sectional drawing attached to the taper shank which is a tool holder which mounts a rotary transformer in a machining center. It is sectional drawing of the conventional flat rotary transformer. It is sectional drawing of the conventional vertical rotary transformer.

A rotary transformer 1 according to an embodiment of the present invention will be described with reference to FIG. 2 which is a perspective view of FIG. 1 and a cross-sectional view taken along line AA. The rotary transformer 1 includes a stator 3 and a rotor 2. The stator 3 is provided with a coil obtained by winding a copper wire 5 around a core 4 made of soft ferrite a plurality of times. The core 4 made of soft ferrite covers the core with an insulating paint in order to prevent a short circuit with the copper wire. Copper wires are given the name of the coated resin and are sometimes called urethane wires. Moreover, the electric wire wound and used by the coil form may be called a magnet wire.
Since the stator 3 is housed in an empty space in the machining center, it is necessary to deform the stator 3 according to the space. Therefore, the shape of the core was changed to a shape in which the rod was bent at a substantially right angle.

  The rotor 2 is provided with a coil in which a copper wire 5 is wound a plurality of times around a core 4 made of soft ferrite. The core 4 made of soft ferrite covers the core with an insulating paint in order to prevent a short circuit with the copper wire. Furthermore, the name of the coated resin is given to the copper wire, and it is sometimes called a urethane wire. Moreover, the electric wire wound and used by the coil form may be called a magnet wire.

  As for the shape of the core 4 of the stator 3, a flat plate made of soft ferrite is manufactured using a processing machine such as a machining center. First, one end of the flat plate is cut with a radius of curvature larger than the radius of the core 4 of the rotor.

When the width H of the stator is 2/3 or less with respect to the radius R of the rotor shown in the plan view of FIG. 3 and the cross-sectional view taken along the line AA of FIG. May be flat. By making the tip of the stator flat, it is easy to visually determine the arrangement of the rotor and the stator. Then, the central part of the flat plate is cut out and manufactured into the shape of the core 4 of the stator 3 shown in the figure.
Furthermore, regarding the shape of the stator, the length of the bent portion L2 is at least twice that of the straight portion L1, and the number of windings of the copper wire is increased even if the straight portion L1 is the same. growing.

  On the other hand, the core 4 of the rotor 2 forms a groove for winding the copper wire 5 with a polishing grindstone on the outer peripheral side of the annular core. Then, an insulating paint is applied to the surface of the groove, and the copper wire 5 is wound to form a coil.

  The rotary transformer 1 of the present invention described above is mounted on the taper shank (BT30) which is the tool holder 7. First, in order to fix the rotor at a desired position of the taper shank which is the tool holder 7, an aluminum spacer is inserted. Then, the rotor is put, and in order to fix the rotor to the taper shank which is the tool holder 7, it is tightened with the male screw of the taper shank which is the tool holder 7 and an aluminum nut. Here, the taper shank which is the tool holder 7 is used, but other types of tool holders may be used as long as they hold the tool.

  On the other hand, the wiring from the Langevin type ultrasonic vibrator is brought out through a hole provided in the taper shank which is the tool holder 7.

  Next, the copper wire of the rotor and the wiring from the Langevin type ultrasonic transducer are connected by soldering. Then, in order to insulate the soldered portion, coating is performed using silicon resin.

  In order to fix the Langevin type ultrasonic transducer to the taper shank which is the tool holder 7, the taper of the taper shank which is the tool holder 7 and the taper of the flange are fitted and tightened with a ring-shaped male screw.

  A tool 10 is accommodated by attaching a collet chuck 9 to the tip of a Langevin type ultrasonic transducer 8 fixed to a taper shank which is a tool holder 7 and tightening a lock nut. And the tool 10 attached to the taper shank which is the tool holder 7 is accommodated in the magazine of an automatic tool changer (ATC).

  On the other hand, the stator 3 of the rotary transformer 1 is attached to the stator attachment 12 fixed to the machining center. The wiring 14 from the stator 3 is connected to the ultrasonic oscillation circuit 13.

  Next, an operation method of the machining center on which the Langevin type ultrasonic transducer 8 fixed to the tapered shank which is the tool holder 7 of the present invention is mounted will be described.

  First, a program for machining a workpiece is created at a machining center. For example, a program for providing holes and grooves in an alumina plate.

  Next, the ultrasonic oscillation circuit 13 is turned on, and an AC voltage of about 36 KHz is applied to the piezoelectric ceramic of the ultrasonic vibrator 8 through the wiring 14 of the stator 3 of the rotary transformer 1. The ultrasonic vibration of about 36 KHz propagates to the drill or end mill which is the tool 10 via the collet chuck 9, and the ultrasonic vibration in the longitudinal vibration mode of about 7 μmp-p is excited at the tip of the tool 10. In FIG. 5, the position of the ultrasonic oscillation circuit 13 is located at the lower right of the figure, but actually, it is housed in a control box (not shown).

  Then, the machining center is turned on, and the tool 10 attached to the taper shank as the tool holder 7 is taken out from the magazine by the ATC arm for exchanging the tool 10 of the automatic tool changer (ATC). Then, as shown by the arrows in the figure, it moves up and down, left and right from the side opposite to the stator attachment 12 and is inserted into the tapered hole of the spindle shaft 6, and the pull stud is pulled in and fixed to the spindle shaft 6. In addition, a plurality of nozzles for ejecting a cutting fluid and a plurality of cooling air nozzles may be arranged on the semicircular side including the stator attachment 12 on the surface orthogonal to the central axis of the spindle shaft. Therefore, the stator is required to be small in the circumferential direction.

  Here, the taper shank that is the tool holder 7 moves in the direction of the arrow. However, since the stator 3 of the rotary transformer 1 does not become an obstacle to movement, it can be handled in the same way as the taper shank that is a normal tool holder 7. This is because the shape of the stator 3 is not circular and does not hinder the movement of the taper shank that is the tool holder 7. The rotor is attached below the groove portion of the taper shank, which is the tool holder 7 with which the ATC arm contacts. If there is a rotor above the groove of the taper shank that is the tool holder 7, for example, it cannot be accommodated in a magazine that accommodates the taper shank that is the tool holder 7.

  In addition, the tool 10 being processed is exchanged by exchanging the taper shank which is another tool holder 7 with an automatic tool changer (ATC).

  According to the machining program, drill a plurality of holes in the alumina plate. Then, the taper shank, which is a tool holder 7 equipped with an end mill, is replaced with a groove to perform grooving.

  Finish machining and switch off the machining center according to the machining program. Then, the ultrasonic oscillation circuit is turned off to finish the operation.

  As described above, the rotary transformer of the present invention can apply power to the rotating ultrasonic transducer.

  The rotary transformer of this invention can be used for the ultrasonic processing apparatus which changes a tool using an automatic tool change apparatus.

DESCRIPTION OF SYMBOLS 1 Rotary transformer 2 Rotor 3 Stator 4 Core 5 Copper wire 6 Spindle shaft 7 Tool holder 8 Ultrasonic vibrator 9 Collet chuck 10 Tool 11 Rotor fixing nut 12 Stator fixture 13 Ultrasonic oscillation circuit 14 Drive wiring 15 Ground Wiring 16 Core storage case

Claims (4)

  In the rotary transformer, the rotor is an annular shape, and the stator is a rod having a bent shape.   2. The rotary transformer according to claim 1, wherein the length of the bent portion L <b> 2 is twice or more with respect to the linear portion L <b> 1 of the stator.   2. The rotary transformer according to claim 1, wherein the width H of the stator is 2/3 or less with respect to the radius R of the rotor, and the tip of the stator is a flat surface.   The rotary transformer according to claim 1, wherein the tool holder moved by the automatic tool changer has a rotor.

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