摘要:
THE INVENTION RELATES TO AN ELECTROCHEMICAL GRINDING MACHINE OF THE TYPE HAVING (1) A DRIVING UNIT DRIVING A GRINDING DEVICE IN CONTACT WITH AN ELECTROCHEMICALLY ERODABLE WORKPIECES, SAID GRINDING DEVICE COMPRISING ELECTRICALLY NON-CONDUCTIVE, OR SUBSTANTIALLY NON-CONDUCTIVE, ABRASIVE GRAIN EMBEDDED IN AND PROJECTING FROM A ELECTRICALLY CONDUCTIVE MATRIX, (2) MEASNS FOR SUPPLYING AN ELECTROLYTE TO THE ZONE (INTERSTICES BETWEEN THE ABRASIVE GRAINS) BETWEEN THE GRINDING DEVICE AND THE WORKPIECES AND (3) FIRST POTENTIAL SOURCE MEANS FOR SUPPLYING AN ELECTRICAL POTENTIAL BETWEEN SAID GRINDING DEVICE AND SAID WORKPIECE. ACCORDING TO THE INVENTION SUCH MACHINE IS FURTHER PROVIDED WITH (1) A CLEANING ELECTRODE FOR CLEANING SAID GRINDING DEVICE, (2) FURTHER POTENTIAL SOURCE MEANS FOR APPLYING AN ELECTRICAL POTENTIAL BETWEEN SAID CLEANING ELECRODE AND SAID GRINDIG DEVICE AND (3) A SENSING ELECTRODE AND CIRCUITRY THEREFOR TO ANALYZE AND CONTROL THE CONDITIONS ON THE GRINDING DEVICE. SAID CLEANING ELECTRODE IS SPACED FROM SAID WORKPIECE IN A DIRECTION PARALLEL TO THE WORKING FACE OF SAID GRINDING DEVICE AND IS SPACED FROM SAID GRINDING DEVICE IN A DIRECTION PERPENDICULAR TO THE WORKING FACE THEREOF. SAID LAST-NAMED POTENTIAL SOURCE MEANS IS RESPONSIVE TO THE CONDITIONS DETECTED BY THE SENSING ELECTRODE AND CIRCUITY THEREFOR TO CONTROL THE DURATION OF CURRENT FLOW FROM THE LAST-NAMED POTENTIAL SOURCE MEANS TO THE CLEANING ELECTODE. THE LAST-NAMED POTENTIAL SOURCE MEANS MAY BE OF EITHER FLUCTUATING OR INTERMITTENT NATURE AND OF EITHER CONSTANT OR ALTERNATING POLARITY. THE SPACING OG THE CLEANING ELECTRODE FROM THE GRINDING DEVICE, THE CONDUCTIVITY OF THE ELECTROLYTE, THE MAGNITUDE AND POLARITY OF SAID FURTHER POTENTIAL SOURCE MEANS EITHER STEADY OR PULSED, ARE ALL CHOSEN AND BALANCED TO EFFECT SUFFICIENT SPARKING BETWEEN SAID CLEANING ELECTRODE AND SAID GRINDING DEVICE TO KEEP SAID GRINDING DEVICE AT LEAST SUBSTANTIALLY FREE OF WASTE MATERIAL WHICH CAN OTHEREWISE ACCUMULATE THEREON BUT WITHOUT APPRECIABLY ERODING SAID GRINDING DEVICE. WHERE A DEPLATING MODE OF CLEANING IS PREFERRED, APPROPRIATE PARAMESTERS ARE SELECTED TO THE EFFECT THE DESIRED DEPLATING BUT WITHOUT EXCESSIVELY EXPOSING THE ABRASIVE GRAIN.
摘要:
A novel method of polishing a workpiece surface comprises passing over the surface in elastically compressive abrasive contact therewith a mass of discrete, elastically deformable pieces each individually consisting of a matrix of elastomeric material containing finely divided abrasive particles substantially uniformly distributed at least along a surface region of the individual piece.
摘要:
When using CO as the absorbing and lasing species for vibration-vibration energy transfer and subsequent vibration-vibration pumping, CO can be made to dissociate and subsequently form C.sub.2 with isotope separation, or CO may be made to chemically react with N.sub.2 to produce CN with isotope separation.
摘要:
An electrochemical etching cell (1) is proposed for etching an etching body (15) made at least superficially of an etching material. The etching cell (1) has at least one chamber filled with an electrolyte, and is provided with a first electrode (13), which at least superficially has a first electrode material, and with a second electrode (13′) which at least superficially has a second electrode material. Furthermore, the etching body (15) is in contact, at least region-wise, with the electrolyte. In this context, the first electrode material and the second electrode material are selected such that, after the etching, the etching body (15) is not contaminated and/or is not impaired in its properties by the electrode materials. In particular, the electrode materials are the same materials as the etching material. Also proposed is a method for etching an etching body (15) using this etching cell (1), the first and/or the second electrode (13, 13′) being used as a sacrificial electrode. The proposed etching cell is particularly suitable for etching silicon wafers in a CMOS-compatible production line.
摘要:
A machining solution for removal-machining an object to be machined 103 is introduced to an inside of a machining solution container 101, and a predetermined voltage is applied to between the machining electrode 104 and the object to be machined 103 to cause electrochemical reaction thereby fabricating a part cast mold. Then the machining solution is changed to a machining solution for metal layer formation to effect additional machining on a surface of the cast mold, forming a metal layer. Then the machining solution is changed to a machining solution for part formation to effect additional machining inside the cast mold, forming a part. Finally the machining solution is changed to a machining solution for dissolving metal layer to dissolve the metal layer to taking out the inside part, fabricating a part.
摘要:
A part fabricating apparatus has a holder for holding an object to be machined immersed in an electrolytic solution. A machining electrode subjects a surface of the object to an electrochemical reaction to electrolytically machine the surface of the object. The machining electrode has a sharp-edged tip and is coated with an insulator except for the sharp-edged tip. A spacing changing unit detects and changes a spacing between the surface of the object and the machining electrode. A potential/current control unit controls a potential/current on the machining electrode. An electrolytic solution changing unit supplies a first electrolytic solution for subjecting the surface of the object to be machined to a removal process to fabricate a cast mold, supplies a second electrolytic solution for depositing a first metal on a surface of the cast mold to form a first metal layer, and supplies a third electrolytic solution for depositing a second metal inside the cast mold to form a part.
摘要:
A part fabricating method comprises the steps of machining an object to fabricate a part cast mold, depositing a first metal on a surface of the cast mold to form a first metal layer, and depositing a second metal different in kind from the first metal inside the cast mold to form a part. The first metal layer is then selectively removed to take out the part formed inside the cast mold.
摘要:
Destructive erosion of the tips of cathodes used in electrochemical machining operations, which is due to reverse current flow through the workpiece and cathode during nonmachining operations, is prevented by continuously passing a small DC current through the workpiece and cathode in the same direction as the normal current flow during machining operations. The voltage drop produced by the current flow may also be used to indicate the occurrence of a fault such as a lower than normal gap resistance between the cathode and workpiece during nonmachining operations and thereby prevent actuation of the main power supply until the fault is corrected.
摘要:
A method of and apparatus for radiussing the edge or edges of a metallic aerofoil blade by electrolytic machining wherein the electrolyte is flowed towards the edge to be machined from a hollow electrode.
摘要:
A device for electrochemical grinding by removing material from the surface of a conducting workpiece, comprising a conformator tool including two separate members, a first member for a quick attack of a rough shaped workpiece, comprising a support, one front-end of which is shaped as the compliment of the sectional contour to be obtained along the outer periphery of the workpiece, which operates during a first step of the operation; a high electrolyte flow output supply; a high density current electricity source; and the second member is an electrolytic grinder operating at the rear part of the support, for grinding the workpiece to the desired final shape, the rear part of the support constituting a damming bulk for the electrolyte.