US 12,337,403 B2
Change device, fine hole electric discharge machine and electrode change method
Yasuhiko Fujisawa, Yokohama (JP); and Yuzo Dohi, Yokohama (JP)
Assigned to Sodick Co., Ltd., Yokohama (JP)
Filed by Sodick Co., Ltd., Kanagawa (JP)
Filed on Sep. 24, 2021, as Appl. No. 17/484,237.
Claims priority of application No. 202011071849.X (CN), filed on Oct. 9, 2020.
Prior Publication US 2022/0111455 A1, Apr. 14, 2022
Int. Cl. B23H 7/26 (2006.01); B23H 9/14 (2006.01); B23H 11/00 (2006.01); B23Q 3/155 (2006.01)
CPC B23H 7/265 (2013.01) [B23H 9/14 (2013.01); B23H 11/00 (2013.01); B23Q 3/15526 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A fine hole electric discharge machine, comprising a first change device, a second change device, a first electrode collecting device and a second electrode collecting device, wherein the first change device, comprising:
automatic electrode supply devices each comprising an electrode cartridge storing a plurality of electrodes of a predetermined diameter and an electrode feeder device supplying the electrodes one by one from the electrode cartridge;
wherein the electrode feeder device includes a delivery tube housed in a housing so as to be movable in the vertical direction, a cushion pad provided at the top of the delivery tube, a compression coil spring pressing the delivery tube upward, a lock ring provided below the housing, and a notch provided between the lock ring and the compression coil spring;
wherein the electrode cartridge is attached to an upper portion of the housing coaxially with the delivery tube;
the electrode is delivered from the electrode cartridge by a case pusher cylinder provided on a side of machining main spindle, which moves the delivery tube in the vertical direction;
a first magazine accommodating, in a detachable manner, the automatic electrode supply devices storing the electrodes of different diameters; and
a first transfer device configured to transfer the automatic electrode supply devices from the first magazine to a fine hole electric discharge machine;
wherein the first magazine comprises a circular magazine table that is controlled to indexably rotate and a plurality of accommodation members arranged at predetermined intervals on an outer circumference of the magazine table;
each of the accommodation members comprises an upper accommodation member, a central accommodation member, and a lower accommodation member;
the upper accommodation member, the central accommodation member, and the lower accommodation member are vertically aligned and each have a concave portion supporting the automatic electrode supply devices;
wherein the upper accommodation member is a member to prevent the automatic electrode supply device from tilting in a pitch direction;
wherein the lower accommodation member comprises ball plungers, the ball plungers engage a groove provided on a side surface of the automatic electrode supply device; and
each of the automatic electrode supply devices is fixed by engaging with the lower accommodation member,
wherein the second change device comprises a second magazine accommodating electrode holders in a detachable manner and a second transfer device configured to transfer the electrode holders between the second magazine and a second chuck provided on a tip portion of a machining main spindle, and
the second magazine accommodates a plurality of electrode holders holding the electrodes of different diameters,
wherein the first electrode collecting device is provided below a position of a machining head during machining; and
the second electrode collecting device is provided below the second change device and collects the electrode having an electrode length of a predetermined value or more.