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US 6,211,480 B1Granted
EDM machine for fine hole and EDM method using such machine
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorToshiya Nagata
Life of this patent
Estimating the term…
Abstract
An intermediate electrode guide is disposed between an electrode guide and an electrode holder. An intermediate electrode chuck of rubber elastic body is provided on the intermediate electrode guide. The intermediate electrode chuck has an insertion hole. The hole is enlarged when a fine hole machining electrode is inserted therein so as to facilitate such insertion. On the other hand, a diameter of the hole is lessened by driving a piston when feeding the electrode or machining the workpiece. Thus, the electrode is grasped by the intermediate chuck. The chuck and the electrode are rotated via bearings 13 and 19 so as to prevent shift of the electrode.
Claims29
An electric discharge machining (EDM) machine for a fine hole comprising:
- a machining electrode for machining a fine hole on a workpiece by electric discharge;
- an electrode holder mounting the machining electrode;
- an electrode guide guiding the machining electrode in approaching a workpiece;
- and
- an intermediate electrode guide provided between the electrode holder and the electrode guide, the intermediate electrode guide holding the machining electrode between the electrode holder and the electrode guide when the machining electrode machines the workpiece by electric discharge;
- the intermediate electrode guide including electrode holding means capable of mechanically grasping and releasing the machining electrode holding means cooperating with the electrode holder so as to feed the machining electrode toward the workpiece while grasping the machining electrode.
3 more elements
An electric discharge machining (EDM) machine for a fine hole comprising:
- a vertically disposed machining electrode for machining a fine hole on a workpiece by electric discharge;
- an electrode holder disposed at an upper position so as to grasp and fix an upper side of the machining electrode;
- an electrode guide disposed at a lower position so as to guide a lower side of the machining electrode in approaching a workpiece, the workpiece being disposed under the electrode guide and machined by the machining electrode which is guided into the electrode guide and protruded downward from the electrode guide;
- working fluid supply means supplying a working fluid via a pipe;
- an axial flow nozzle disposed at the electrode holder, said axial flow nozzle being supplied with the working fluid from the working fluid supply means via the pipe so as to form an axial flow about an axis of the machining electrodes, flowing from the electrode holder to the electrode guide;
- a working fluid collecting nozzle provided on an upper side of the electrode guide so as to receive the working fluid forming the axial flow;
- and
- an aspirator for sucking the working fluid received in the working fluid collecting nozzle away from the working fluid collecting nozzle.
5 more elements
An electric discharge machining (EDM) machine for a fine hole comprising:
- a machining electrode for machining a fine hole on a workpiece by electric discharge;
- an electrode holder mounting the machining electrode;
- an electrode guide guiding the machining electrode in approaching a workpiece;
- a coating material coating the machining electrode except a portion thereof mounted to the electrode holder;
- the coating material being solid at an ordinary temperature;
- a coated electrode guide provided on an upper side of the electrode guide so as to guide an end of the machining electrode coated with the coating material to the electrode guide;
- and
- heating means provided on an upper side of the electrode guide, the heating means applying heat of not less than a melting point of the coating material to the coating material covering the machining electrode so as to melt and remove the coating material completely at the coated electrode guide.
5 more elements
An electric discharge machining (EDM) method for a fine hole, comprising the steps of:
- mechanically grasping an upper end side of a fine hole machining electrode using an electrode holder, while directing a lower end of the fine hole machining electrode toward an electrode guide disposed below the electrode holder and opposing the electrode holder;
- mechanically grasping a middle position of the fine hole machining electrode using an intermediate electrode guide provided between the electrode holder and the electrode guide;
- and
- feeding the fine hole machining electrode toward a workpiece disposed below the electrode guide so as to make the lower end of the fine hole machining electrode approach a workpiece via the electrode guide, thereby performing electric discharge machining;
- wherein, in feeding the fine hole machining electrode toward the workpiece and performing the electric discharge machining, the fine hole machining electrode is held by the intermediate electrode guide so that the electrode holder, the fine hole machining electrode and the intermediate electrode guide are integrally moved as one body, while the lower end of the fine hole machining electrode is guided by the electrode guide.
2 more elements
An electric discharge machining (EDM) machine for a fine hole comprising:
- a machining electrode for machining a fine hole in a workpiece by electric discharge;
- an electrode holder mounting the machining electrode;
- an electrode guide guiding the machining electrode toward a workpiece;
- an axial flow nozzle disposed at the electrode holder;
- working fluid supply means supplying a high-pressure working fluid of approximately 1.8 Mpa or more into the axial flow nozzle, thereby forming an axial flow about an axis of the machining electrode flowing toward the electrode guide, said axial flow guiding said machining electrode and imparting apparent rigidity to said machining electrode, between said electrode holder and said electrode guide.
2 more elements
An electric discharge machining (EDM) machine for a fine hole comprising:
- a machining electrode for machining a fine hole in a workpiece by electric discharge;
- an electrode holder mounting the machining electrode;
- an electrode guide guiding the machining electrode toward a workpiece;
- working fluid supply means supplying a working fluid;
- an axial flow nozzle disposed at the electrode holder, said axial flow nozzle being supplied with working fluid from the working fluid supply means so as to form an axial flow about an axis of the machining electrode flowing toward the electrode guide;
- rotating means for rotating the axial nozzle about the axis of the machining electrode in synchronism with the machining electrode so as to rotate the axial flow about its axis, said axial flow guiding said machining electrode and imparting apparent rigidity to said machining electrode, between said electrode holder and said electrode guide.
3 more elements
Dependencies are inferred from the claim text.