Elliptical ultrasonic machining device powered by non-contact induction

Patent metadata

Field	Value
Publication number	US-10710176-B2
Application number	US-201815972110-A
Country	US
Kind code	B2
Filing date	May 5, 2018
Priority date	May 12, 2017
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

An elliptical ultrasonic machining device powered by non-contact induction mainly includes an induction power supply device and an elliptical ultrasonic spindle shank, wherein: induction power supply secondary units of the induction power supply device encircle a spindle shank shell of the elliptical ultrasonic spindle shank; induction power supply primary units are arranged at a primary magnetic core seat outside the elliptical ultrasonic spindle shank; the primary magnetic core seat and the elliptical ultrasonic spindle shank have a same circle center, and a small gap exists between the primary magnetic core seat and the elliptical ultrasonic spindle shank; the primary magnetic core seat is fastened on a machine tool spindle seat of a machine tool through a support and keeps still; the elliptical ultrasonic spindle shank is mounted on a machine tool spindle through a taper shank and rotates with the spindle in a high speed.

First claim

What is claimed is:

1. An elliptical ultrasonic machining device powered by non-contact induction, comprising an induction power supply device ( 9 ) and an elliptical ultrasonic spindle shank ( 2 ), wherein: induction power supply secondary units ( 92 ) of the induction power supply device ( 9 ) encircle a BT spindle shank shell ( 6 ) of the elliptical ultrasonic spindle shank ( 2 ); induction power supply primary units ( 91 ) of the induction power supply device ( 9 ) are arranged at a primary magnetic core seat ( 911 ) outside the elliptical ultrasonic spindle shank ( 2 ); the primary magnetic core seat ( 911 ) and the elliptical ultrasonic spindle shank ( 2 ) have a same circle center, and a relatively small gap exists between the primary magnetic core seat and the elliptical ultrasonic spindle shank; the primary magnetic core seat ( 911 ) is fastened on a machine tool spindle seat ( 5 ) of a machine tool through a support ( 10 ) and keeps still; the elliptical ultrasonic spindle shank ( 2 ) is mounted on a machine tool spindle ( 4 ) of the machine tool through a taper shank ( 61 ), and rotates with the spindle ( 4 ) in a high speed;
the induction power supply device ( 9 ) comprises two independent loosely coupled transformers, wherein: the two loosely coupled transformers are arranged along an axis direction, up and down; each loosely coupled transformer consists of one induction power supply primary unit ( 91 ) and one induction power supply secondary unit ( 92 ); the induction power supply primary units ( 91 ) are embedded in the primary magnetic core seat ( 911 ), and the primary magnetic core seat is fastened on the machine tool spindle seat ( 5 ) of the machine tool through the support ( 10 ) and keeps still; the induction power supply secondary units ( 92 ) encircle the BT spindle shank shell ( 6 ) and rotate with the machine tool spindle ( 4 ) in the machine tool spindle seat ( 5 ) of the machine tool in a high speed, and a relatively small gap exists between each induction power supply primary unit and the corresponding induction power supply secondary unit;
each induction power supply primary unit ( 91 ) consists of a primary magnetic core ( 912 ) and a primary coil ( 913 ), wherein: the primary coil ( 913 ) is wound in a U-shaped inner circular groove and on an outer circular surface of the primary magnetic core ( 912 ), and the primary coil is connected with an external ultrasonic power supply ( 1 ) through a wire hole ( 9112 ) on the primary magnetic core seat ( 911 ); and, both of the primary magnetic core ( 912 ) and the primary coil ( 913 ) are arranged inside the primary magnetic core seat ( 911 );
the primary magnetic core seat ( 911 ) has an incomplete annular structure with a circumference of 150°; ladder-shaped U-shaped grooves are opened inside the primary magnetic core seat for placing the primary magnetic cores ( 912 ) and the primary coils ( 913 ); and, a support hole ( 9111 ) for connecting with the support ( 10 ) and the wire hole ( 9112 ) for passing through by the primary coils ( 913 ) are opened on the primary magnetic core seat;
each primary magnetic core ( 912 ) has an incomplete annular structure with a circumference of 120°, and a U-shaped groove is opened on an inner circular surface of each primary magnetic core, namely the U-shaped inner circular groove;
each primary coil ( 913 ) is a stranded enameled wire, comprising copper wires and a nylon cover, wherein insulating varnish is coated on the copper wires and the nylon cover wraps the copper wires;
each induction power supply secondary unit ( 92 ) consists of a secondary magnetic core ( 921 ) and a secondary coil ( 922 ), wherein: the secondary magnetic core ( 921 ) is arranged inside a U-shaped annular groove of a secondary magnetic core seat ( 63 ) of the BT spindle shank shell ( 6 ); the secondary coil ( 922 ) is wound inside a U-shaped groove of the secondary magnetic core ( 921 ) and is connected with an elliptical ultrasonic transducer ( 7 ) inside the BT spindle shank shell ( 6 ) through a wire hole ( 65 ) on the secondary magnetic core seat ( 63 );
the secondary magnetic core seat ( 63 ) consists of two U-shaped annular grooves which are arranged along the axis direction, showing a complete annular structure; a width of each U-shaped annular groove is consistent with that of each secondary magnetic core ( 921 ); two parallel wire holes ( 65 ) are opened at a bottom part of each U-shaped annular groove and are distributed symmetrically in 180°;
each secondary magnetic core ( 921 ) is formed through connecting two semi-annular magnetic cores together and arranged inside the secondary magnetic core seat ( 63 ); and the U-shaped groove is opened on an outer circular surface of each secondary magnetic core;
each secondary coil ( 922 ) is a stranded enameled wire, comprising copper wires and a nylon cover, wherein insulating varnish is coated on the copper wires and the nylon cover wraps the copper wires;
the elliptical ultrasonic spindle shank ( 2 ) consists of the BT spindle shank shell ( 6 ), the elliptical ultrasonic transducer ( 7 ), a tool ( 8 ), a rivet ( 3 ) and bolts ( 11 ), wherein: the tool ( 8 ) is connected with the elliptical ultrasonic transducer ( 7 ) through a hot charging head ( 81 ); the elliptical ultrasonic transducer ( 7 ) is fixed inside the BT spindle shank shell ( 6 ) through the bolts ( 11 ); the whole elliptical ultrasonic spindle shank ( 2 ) is fixed on the machine tool spindle ( 4 ) of the machine tool through the rivet ( 3 ) and rotates with the spindle ( 4 ) in a high speed;
the BT spindle shank shell ( 6 ) is designed and modified based on a standard BT spindle shank, comprising the taper shank ( 61 ), an annular groove ( 62 ), the secondary magnetic core seat ( 63 ), an inner cavity ( 64 ) and bolt holes ( 66 ), wherein: the taper shank ( 61 ) is located at a tail part of the BT spindle shank shell ( 6 ), for connecting with the machine tool spindle ( 4 ) of the machine tool; the annular groove ( 62 ) is located at a middle part of the BT spindle shank shell ( 6 ); the secondary magnetic core seat ( 63 ) is located at a head part of the BT spindle shank shell ( 6 ), and the wire holes ( 65 ) are opened at the bottom part of each U-shaped annular groove of the secondary magnetic core seat; and the inner cavity is opened inside the BT spindle shank shell ( 6 );
the taper shank ( 61 ) is consistent with a taper shank of the standard BT spindle shank, and is able to be fixed on the machine tool spindle ( 4 ) of the machine tool to rotate with the spindle ( 4 ) in a high speed;
the annular groove ( 62 ) is consistent with an annular groove of the standard BT spindle shank and meets an automatic tool change requirement;
the secondary magnetic core seat ( 63 ) has been described when illustrating the induction power supply device ( 9 ) and is not repeated;
the inner cavity ( 64 ) has a ladder-shaped cylindrical cavity structure, for placing the elliptical ultrasonic transducer ( 7 );
the bolt holes ( 66 ) are threaded holes of M4*1, for fixing a flange plate ( 712 ) of the elliptical ultrasonic transducer ( 7 );
the elliptical ultrasonic transducer ( 7 ) consists of an ultrasonic horn ( 71 ), a piezoelectric ceramic stack, a back cover plate ( 74 ), copper electrodes ( 73 ), and an insulation sleeve ( 75 ), wherein: a screw ( 711 ) is arranged at a large end of the ultrasonic horn ( 71 ) with the insulation sleeve ( 75 ) sleeved on an outer surface of the screw; an inner hole of the back cover plate ( 74 ) has thread thereon, and the back cover plate presses the piezoelectric ceramic stack together through a preset pre-tightening force;
the ultrasonic horn ( 71 ) has a ladder-shaped cylindrical structure with datum lines of cylindrical sections ensured to be coaxial, wherein: the screw ( 711 ) is arranged at the large end of the ultrasonic horn; a threaded hole is opened at a small

Assignees

• Univ Beihang

Inventors

• Jiang Xinggang
• Zhang Deyuan

Classifications

• B06B3/00 Primary

  Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency · CPC title

• B23C5/26

  Securing milling cutters to the driving spindle · CPC title

• B23Q1/0027

  between moving parts between which an uninterrupted energy-transfer connection is maintained · CPC title

• B23B2270/10

  Use of ultrasound · CPC title

• B23B37/00

  Boring by making use of vibrations of ultrasonic frequency (working materials by subjecting the grinding tools or the abrading medium to vibration, e.g. grinding with ultrasonic frequency, B24B1/04) · CPC title