JPH0354819Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is for electrolytic composite mirror finishing, which combines the anodic melting of a metal workpiece by electrolytic action and the polishing action of abrasive grains to finish the workpiece surface to a mirror finish. Regarding electrode tools.

[Conventional technology]

Conventional. An example of this type of electrode tool is the one shown in the specification and drawings of Japanese Patent Application No. 55-82536. In other words, cathodic electrodes and abrasive cloth are alternately arranged on the tool surface of a rotating tool via buffers, and the tool is provided with a supply port for a machining fluid containing abrasive grains mixed in an electrolytic solution. In addition to being open on the tool surface, a machining fluid reservoir portion that is long in the direction orthogonal to the rotational direction of the tool is provided on the tool surface.

According to this, the elution and removal action of the anodic metal workpiece due to the electrolytic action is combined with the form of a passivation oxide film on the workpiece surface facing the electrode and the mechanical abrasion action (polishing action) by abrasive grains. The workpiece surface is mirror-finished.

By the way, when electrolytically composite mirror-finishing a metal workpiece with a curved surface, it is desirable to use an electrode tool having a machining surface corresponding to the curved surface, but if the workpiece has a so-called free-form surface, It is difficult to form a machining surface that can be followed, and furthermore, in order to combine electrolytic action and polishing action, it is necessary to alternately arrange electrodes and polishing cloths in the same way as described above. However, the problem is that the structure becomes complicated.

[Problem that the invention attempts to solve]

Therefore, the technical objective of this invention is to provide an electrode tool that can synergistically and quickly perform electrolytic action and abrasion action while simplifying the structure when mirror-finishing a workpiece having a curved surface.

[Means for solving problems]

This invention provides an electrode tool for electrolytic composite mirror finishing, which includes a tool support having a supply cavity in the center to which a machining fluid containing abrasive grains mixed in an electrolytic solution is supplied;
a vertically hollow rotating shaft rotatably supported at the center of the support; a supply port formed on the peripheral wall of the rotating shaft located in the supply cavity for introducing machining liquid from the supply cavity into the hollow part of the rotating shaft; a cathodic tool electrode that is integrally provided at the lower part of the rotating shaft and has a convexly curved lower surface facing a workpiece having a curved surface, and a plurality of cathodic tool electrodes that are formed on the entire surface of the convexly curved surface of this electrode and each communicate with the hollow part. and an insulating abrasive cloth having a plurality of through holes provided on the convex curved surface of the electrode and communicating with each of the jet holes.

[Effect]

Therefore, in the electrode tool for electrolytic composite mirror finishing of this invention, a DC power source is connected between the electrode and a workpiece having a curved surface, and the convex curved surface of the electrode is supplied while supplying machining fluid into the supply cavity of the tool support. It is pressed against the curved surface of the workpiece through an abrasive cloth, and the rotating shaft is rotated and the support is moved to give relative movement to the workpiece.
When polishing is performed, the machining fluid in the supply cavity flows into the hollow part of the rotating shaft through the supply port of the rotating shaft, moves downward through the hollow part, and is discharged from each spout port of the electrode through the through hole. An electrolytic current flows between the electrode and the workpiece through this working liquid, and the workpiece surface is anodic-dissolved. Next, the abrasive grains in the working liquid flow between the abrasive cloth and the workpiece surface. The surface of the workpiece is polished by the abrasive grains, and the elution removal action by the electrolytic action and the abrasion action by the abrasive grains are combined to give the workpiece surface a mirror finish.

〔Example〕

Next, this invention will be explained in detail with reference to drawings showing one embodiment thereof.

In the drawing, 1 indicates a machining fluid supply cavity 2 in the center.
It is an electrically conductive tool support formed with a supply pipe body 4 having a supply channel 3 communicating with the supply cavity 2 . 5 is a conductive shaft holder integrally provided on the lower surface of the support 1, and 6 is a vertically conductive hollow rotating shaft rotatably supported at the center of the support 1 and the shaft holder 5. A plurality of supply ports 7 communicating with the supply cavity 2 are formed in the upper peripheral wall of the rotating shaft 6. Reference numeral 8 denotes an inverted dish-shaped shaft end integrally formed at the lower end of the rotating shaft 6.

A power supply brush 9 is provided at the power supply connection port of the shaft holder 5 and slidably contacts the outer peripheral surface of the rotating shaft 6 under the pressure of a spring while electrically connected to the shaft holder 5;
10 is a connection body provided on the supply pipe body 4.

Reference numeral 11 indicates a motor support tube integrally provided on the upper surface of the support body 1, and reference numeral 12 indicates a motor supported by the support tube 11, and the rotary shaft 6 is integrally connected to the output shaft of the motor.

13 is a circular tool electrode integrally attached to the shaft end 8 of the rotating shaft 6 so as to close the lower opening of the shaft end 8, and has a convex curved surface 14 formed on the lower surface; 15 is a circular tool electrode attached to the shaft end 8 of the rotating shaft 6; A plurality of spout ports are provided in communication with the inside of the electrolytic solution, each opening into the convex curved surface 14, and equally arranged over the entire surface of the convex curved surface 14. but,
As shown by the arrow, it is supplied to the supply cavity 2 through the supply channel 3 of the supply pipe body 4, flows into the rotating shaft 6 from the supply port 7, and further flows into the shaft end 8.
The water is supplied to each spout 15 from the inside.

Reference numeral 16 denotes an insulating abrasive cloth provided on the convex curved surface 14 of the electrode 15 so as to cover the convex curved surface 14, and the peripheral edge of the abrasive cloth 16 is fitted onto the outer periphery of the shaft end 8 to form a fixed ring 17. The abrasive cloth 16 is attached by tightening with. Reference numeral 18 designates a plurality of through holes provided in the polishing cloth 16 so as to communicate with the respective jet ports 15 .

19 is a metal workpiece with a curved surface that becomes the material to be polished; 20 is a DC power source; the workpiece 1 is connected to the anode of the
The electrode 13 is connected to the cathode through the connecting body 10, the supply tube 4, the shaft holder 5, the power supply brush 9, the rotating shaft 6, and the shaft end 8.

Then, while supplying machining fluid from the supply path 3 to the surface of the workpiece 19 from each spout 15 and each through-hole 18, the rotary shaft 6 is rotated by the motor 12, and the tool and the workpiece 19 are moved relative to each other. move to
Further, the convex curved tool surface of the tool is pressed against the surface of the workpiece 19 to perform electrolytic composite mirror finishing.

At this time, an electrolytic current flows between the workpiece 19 and the electrode 13 through the machining liquid, that is, the electrolyte, passing through each spout 15 and the through hole 18, and the workpiece 19 is anodic eluted, and the entire surface of the tool surface is Since each of the jet ports 15 and the through holes 18 arranged over the area pass through the entire surface of the workpiece 19 as the rotating shaft 6 rotates and moves relative to the workpiece 19, anode elution occurs. The action is applied to the entire surface of the workpiece 19, and furthermore, the surface of the workpiece 19 facing the through hole 18 then faces the abrasive cloth 16, and the abrasive grains in the working fluid are spread between the workpiece 19 and the abrasive cloth 16. The surface of the workpiece 19 is polished by the abrasion force.

In this way, the convexly curved tool surface of the tool moves to follow the curved surface of the workpiece 19, and the elution and removal action of the workpiece 19 by electrolytic action and the mechanical abrasion action by the abrasive grains are synergistically performed quickly. , the curved surface of the workpiece 19 is mirror polished.

[Effect of idea]

As described above, according to the electrode tool for electrolytic composite mirror polishing of this invention, the tool electrode 1
By simply providing a plurality of openings 15 in the convexly curved surface 14 of the polishing cloth 16 and providing through holes 18 communicating with each jet opening 15 in the polishing cloth 16, the electrolytic action and the abrasion action can be performed synergistically and quickly. This has the unique effect of making it possible to finish the workpiece 19 having a curved surface into a mirror surface, and greatly simplifying the structure of the electrode 13 and polishing cloth 16.

[Brief explanation of drawings]

The drawing is a partial sectional view of one embodiment of the electrode tool for electrolytic composite mirror finishing of this invention. 6... Rotating shaft, 13... Tool electrode, 14... Convex curved surface, 15... Spout, 16... Polishing cloth, 18...
...Toruguchi, 19...workpiece.

Claims (1)

[Scope of utility model registration request] In an electrode tool for electrolytic composite mirror finishing that processes the workpiece by combining the elution and removal action of an anodic metal workpiece by electrolytic action and the mechanical abrasion action of abrasive grains, the abrasive grains are suspended in the electrolytic solution. a tool support body having a supply cavity in the center to which machining fluid is supplied; a vertical hollow rotation shaft rotatably supported at the center of the support body; and a hollow rotation shaft located in the supply cavity. A supply port is formed on a peripheral wall and introduces the machining fluid from the supply cavity into the hollow part of the rotary shaft, and a lower surface facing the workpiece, which is integrally provided at the lower part of the rotary shaft and has a curved surface, is formed into a convex curved surface. a cathodic tool electrode, a plurality of machining fluid jet ports formed on the entire convex curved surface of the electrode and each communicating with the hollow portion, and a plurality of machining fluid jet ports provided on the convex curved surface of the electrode and communicating with each of the jet ports, respectively. An electrode tool for electrolytic composite mirror finishing, which is equipped with an insulating abrasive cloth having through holes.