JPH0347969B2 - - Google Patents

Description

Detailed Description of the Invention The present invention combines the elution and removal action of anodic metal workpieces by electrolytic action and the mechanical abrasion action of a flexible abrasive, thereby producing an electrolytic process for machining flat workpieces. Regarding the composite machining method, the objective is to obtain shape machinability in addition to the high-speed removal performance and finished surface finish of electrolytic composite machining.

Conventionally, there are electrolytic machining methods and electrolytic grinding methods as processing methods that utilize electrolytic action, and these methods are considered effective in fields where mechanical processing methods cannot cope with problems such as shape and materials. However, these methods originally place emphasis on productivity and are not suitable for precision machining that requires shape accuracy.

By the way, in conventional electrolytic composite machining, an electrode tool as shown in FIG. 1 is used.

In the figure, 1 is the base of a conductive rotating disk-shaped electrode tool whose lower end is expanded into a dish shape, 2 is a supply channel for an electrolytic solution 3 formed in the base 1, and 4 is attached to the lower end surface of the base 1. a cathodic disk-shaped electrode; 5 is electrode 4;
6 is an insulating, water-permeable, flexible abrasive material equipped with abrasive grains attached to the lower surface of the electrode 4; 7 is an anodic metal flat surface; It is a workpiece.

Then, during processing, a predetermined current is passed between the cathode electrode 4 and the anodic metal flat workpiece 7 using an electrode tool as shown in FIG.
This is done by rotating the electrode tool and moving the electrode tool or the flat workpiece 7 at the same time.

The cross-sectional shape of the workpiece after this machining has passed through the electrode tool appears as an integral form of the machined cross-sectional shape of the workpiece when there is no relative movement between the electrode tool and the workpiece.

Figure 2 shows the machining cross-sectional shape when there is no relative movement, and the machining depth Hc at the electrode center and the machining depth Hb at the electrode end are different from each other. The machined cross-sectional shape after passing the tool is
It changes in various ways depending on the relationship between Hc and Hb. In the electrode tool shown in FIG. 1, Hc/Hb≈0. This invention has been made with the above-mentioned points in mind, and includes a disk electrode, a surrounding annular main electrode,
Using a rotating disk-shaped electrode tool, which is composed of an auxiliary electrode provided at the center with a potential higher than the potential of the main electrode, which is provided to the main electrode via an insulator, and whose electrolytic action differs between the center and the periphery, When there is no relative movement between the electrode tool and the workpiece in an electrolytic composite processing method that combines the elution and removal action of an anodic metal workpiece by electrolytic action and the mechanical abrasion action of a flexible abrasive material. Provided is an electrolytic composite machining method characterized in that the relationship between the machining depth Hc at the center of the electrode of the electrode tool and the machining depth Hb at the end of the electrode is 0.1<Hc/Hb<0.3. It is something.

Therefore, according to the processing method of the present invention, in addition to the high-speed removability and finishability of the machined surface of electrolytic composite processing, it is possible to improve the shape processability.

Next, this invention will be explained in detail with reference to the drawings from FIG. 3 onwards showing an embodiment thereof.

In FIG. 3, reference numeral 8 denotes the base of a cylindrical conductive rotating disk electrode tool whose lower end is enlarged into a disk shape;
Reference numeral 9 denotes a cathodic annular main electrode attached to the lower end surface of the base 8, 10 a cylindrical conductive auxiliary part attached to the inner surface of the base 8 via an insulator 11, and 12 a lower part of the auxiliary part. This is a cathodic disk-shaped auxiliary electrode attached to the end face, and is provided at the center of the main electrode 9 with an insulator 11 interposed therebetween. 13 is an electrolyte supply part formed in the auxiliary part 10; 14 is an electrolyte outlet provided in the center of the auxiliary electrode 12 so as to communicate with the supply channel 13; 15 is the main electrode 9, the auxiliary electrode 12 16 is an anodic metal flat workpiece, E ₂
and E ₁ are main electrode 9 and auxiliary electrode 1 respectively
2 and the workpiece 16, and has a relationship of E ₁ >E ₂ , and a potential higher than that of the main electrode 9 is applied to the auxiliary electrode 12 .

Therefore, when an electrode tool consisting of the main electrode 9 and the auxiliary electrode 12 shown in Fig. 3 is used, the machined cross-sectional shape shown in Fig. 2 changes, and the central part of the electrode has a higher potential than the surrounding area. , the amount of processing at the center increases, and by changing the potential of the auxiliary electrode 12, the value of Hc/Hb can be changed.

Next, the experimental results will be explained.

First, regarding the case where there is no relative movement between the electrode tool and the workpiece, when using the conventional electrode tool shown in Figure 1, the diameter of electrode 4 = 70 mm, the applied voltage = 10 V, the current = 38 A, and the rotation speed = 620 rpm. Hc=0 μm, Hb=5 μm, and Hc/Hb.

On the other hand, when using the electrode tool of FIG. 3 of the present invention, main electrode 9, diameter = 70 mm, voltage E ₂ = 10 V, current = 32 A, auxiliary electrode 12, diameter = 26 mm, voltage E ₁ = 22 V, current = 11.7 A. When the rotation speed was 620 rpm, Hc = 1.1 μm, Hb = 5 μm, and Hc/Hb = 0.22.

Next, when the voltage E ₂ of the main electrode 9 is 10V and 15V, the voltage E ₁ of the auxiliary electrode 12 is changed.
The relationship between Hc/Hb is shown in Figure 5.

Next, when the electrode tool moves linearly with respect to the workpiece, the machining depth dc at the tool center position and the distance from the tool center are Machining depth at position r
When dr is the tool radius R, the relationship between r/R and dr/dc at various Hc/Hb is shown in FIG.

Therefore, from Fig. 4, it is necessary to satisfy 0.1<Hc/Hb<0.3 in order to perform precision machining of flat surfaces, and within this condition, flat machining can be performed within a range of up to 85% of the electrode tool diameter 2R. It is possible to keep the machining depth dr of the object uniform.

[Brief explanation of drawings]

Fig. 1 shows a conventional electrode tool, in which Fig. 1A shows a partially cutaway front view, Fig. 2B shows a bottom view, Fig. 2 shows a cross-sectional shape of the tool processed by the tool shown in Fig. 1, and Fig. 3 shows the electrolytic composite of the present invention. Fig. 4 shows one embodiment of the electrode tool, Fig. 4A is a partially cutaway front view, Fig. 4B is a bottom view of Fig. 4
Relationship diagram of r/R and dr/dc for Hc/Hb, 5th
The figure is a diagram showing the relationship between E ₁ and Hc/Hb with respect to E ₂ . 9...Main electrode, 12...Auxiliary electrode, 15...Abrasive material, 16...Planar workpiece.

Claims (1)

[Claims] 1 A disk electrode is composed of a surrounding annular main electrode and an auxiliary electrode provided at the center via an insulator to the main electrode and given a potential higher than the potential of the main electrode, and the electrolytic action is mainly In the electrolytic composite machining method, which combines the elution and removal action of an anodic metal workpiece by electrolytic action and the mechanical abrasion action by a flexible abrasive using a rotating disk-shaped electrode tool with different peripheral parts, the above-mentioned Machining depth Hc of the center of the electrode of the electrode tool and machining depth of the end of the electrode when there is no relative movement between the electrode tool and the workpiece.
An electrolytic composite processing method characterized in that the relationship of Hb is 0.1<Hc/Hb<0.3.