Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-04-30
1992-01-07
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041295, B23H 300, B23H 1100
Patent
active
050788396
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for centering in an electrolytic finishing system, and more particularly to a method for centering a workpiece having a three-dimensional shaped surface and an electrode in the system.
BACKGROUND ART
In a conventional electrolytic machine, liquid electrolyte such as sodium nitrate solution or sodium chloride solution is continuously passed between an electrode and a work at a high speed during machining, so that residual products such as particles of eroded metal from the work, hydrogen gas, and others are discharged from the gap between the electrode and the workpiece and a direct current voltage in the form of pulses is applied between the workpiece and the electrode for finishing the surface of the workpiece.
The applicant of the present invention have proposed electrolytic finishing systems in which a workpiece having a complicated three-dimensional shaped recess is finished by electrolytic machining (see Japanese Patent Application Laid-Open 63-283818 and U.S. Pat. No. 4,800,006). In the system, since an electrode has a surface corresponding to the recessed surface of the workpiece, it is very difficult to center the workpiece with the electrode and a long time is consumed for the centering operation. Japanese Patent Application Publication 62-58850 discloses a centering method in which deflection of an electrode is automatically corrected. However, such a method can not be applied to the system employed with a pair of electrodes consisting of the workpiece having three-dimensional shaped recess and the electrode.
The object of the present invention is to provide a centering method in which the workpiece is a automatically centered with the electrode, thereby reducing operation time for centering.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a method for centering in an electrolytic finishing system comprising locating a workpiece and an electrode having a surface similar to the workpiece in profile in parallel with a standard plane and fixing them, facing a working surface of the workpiece and an electrode surface each other, moving either of the workpiece and the electrode in a plus direction and in a minus direction on an X-axis to contact with each other, detecting the contact position, calculating a moving distance Lx of the moved object in the X-axis, moving the object in the opposite direction by the Lx/2, moving either of the workpiece and the electrode in a plus direction and in a minus direction on Y-axis to contact with each other, detecting the contact position, calculating a moving distance Ly of the moved object in the Y-axis, moving the object in the opposite direction by the Ly/2, and lowering the electrode to be contacted with the workpiece, and then raising the electrode by a predetermined distance.
In an aspect of the invention, the method further comprising rotating either of the workpiece and the electrode in a plus direction and in a minus direction with respect to Z-axis to contact with each other, detecting the contact position, calculating a rotating angle Lc of the moved object, rotating the object in the opposite direction by the Lc/2.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of an electrolytic finishing machine according to the present invention;
FIG. 2 is a front view of the machine;
FIG. 3 is a schematic illustration showing a system of the electrolytic finishing machine;
FIGS. 4a and 4b are block diagrams showing a system for supplying current to an electrode and a workpiece;
FIGS. 5a and 5b show circuits of the system;
FIG. 6 shows circuits of a contact detector in the system;
FIG. 7a and 7b are flowcharts showing an operation of the system;
FIGS. 8a to 8i are explanatory illustrations showing an operation of a centering method;
FIGS. 9a and 9b are flowcharts showing a second embodiment of the present invention;
FIGS. 10a to 10j are explanatroy illustrations of the second embodiment; and
FIGS. 11a and 11b are flowcharts showing a third embodiment of th
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Kuwabara Youhei
Sugiyama Haruki
Shizuoka Seiki Co. Ltd.
Valentine Donald R.
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