JPS60207725A - Processing fluid for mirror surface - Google Patents

Abstract

PURPOSE:To assure a high quality mirror surface in composite electrolytic mirror surface processing for titanium and alloy thereof by adding for use a specific fatty acid surfactant to an electrolyte containing a trace amount of an electrolyte. CONSTITUTION:A processing fluid 19 is adjusted by adding a fatty acid surfactant such as oleic acid or lauric acid or linolic acid or stearic acid. Hereby, composite mirror surface processing profitably employing both an abrasion by an abrasive grain 22 and an electrolytic effect can be effected to provide high quality mirror surface processing.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mirror polishing liquid used in an electrolytic composite mirror polishing method for mirror finishing titanium and its alloys by combining electrolytic action and abrasive abrasion action. .

[Prior art]

In general, titanium and its alloys are used as structural materials for aircraft because they have excellent chlorine resistance, corrosion resistance, and heat resistance, as well as being light and strong.

It is used not only in the petrochemical industry but also in seawater desalination equipment and automobile parts.

these! In order to make effective use of these characteristics, for example, in heat exchange piping and petrochemical towers, the inner surfaces of the pipes and towers should be finished to a mirror finish to improve thermal conductivity and suppress the buildup on walls. In addition, corrosion resistance is greatly improved.

However, in general, it is difficult to finish a titanium material to a mirror surface, and a method for obtaining a high-quality mirror surface without local defects has not yet been found.

[Purpose of the invention]

An object of the present invention is to provide a mirror finishing liquid for mirror finishing titanium materials such as titanium and its alloys.

[Structure of the invention]

This invention provides an electrolytic solution mixed with a trace amount of electrolyte in a ψ surface processing solution used in an electrolytic composite mirror finishing method for processing titanium and its alloys to a mirror finish by combining electrolytic action and abrasive grain abrasion action. This is a mirror finishing liquid characterized by adding a fatty acid surfactant such as oleic acid, lauric acid, linoleic acid or stearic acid.

〔Effect of the invention〕

Therefore, by using the mirror polishing liquid of the present invention, a titanium material can be mirror-finished using an electrolytic composite surface machining method that combines electrolytic action and abrasive grain abrasion action.

〔Example〕

Conventionally, when abrasive grains are added to metal, water is frequently used as a machining fluid in order to suppress the temperature rise of the machining surface and improve the discharge of machining debris.

However, as shown in Fig. 1, when water f11 is used as the machining fluid and the titanium material (2) is processed with abrasive grains (31), the titanium material 121 is processed by the abrasive grains (31) with low thermal conductivity. The temperature easily rises due to the heat generated, and as a result, the abraded surface becomes a rough surface with significant changes in unevenness.

Therefore, in order to reduce the roughness of the machined surface of titanium material and finish it as a finished surface, it is necessary to suppress such unevenness changes and form uniform scratch marks caused by abrasive grains.

The present invention is a machining fluid that forms a protective film on the surface of a titanium material when rubbed by abrasive grains to eliminate the above-mentioned roughness.Next, the principle and examples thereof will be explained in detail.

First, in order to form uniform scratch marks on a titanium material while suppressing surface roughness, it is necessary to form an appropriate surface protective film to suppress heat generation on the surface.

One way to form such a protective film is to utilize the adsorption phenomenon of certain types of surfactants. It exhibits high adsorption to the formed oxide film, forming a dense adsorption protective film.

Figure 2 shows the situation in which an adsorption film ([i) is formed on the acidic film (4) on the surface of the titanium material 12).
The titanium material (2) will be protected by such a surface protective film.

The oxide film (4) is naturally formed even in the atmosphere, but as shown in Figure 3, titanium is coated with a DC power source (7) in an electrolytic solution (6) containing a small amount of electrolyte. Material 12
By using 1 as an anode and electrolyzing using the cathode (8), a more uniform anodic oxide film (9) is formed and the adsorption of the surfactant component is increased.

Figure 4 shows the abrasive friction situation in such a machining fluid.
The protective film αO grown on the titanium material (2) suppresses heat generation during scratching, and uniform scratch marks without surface roughness are formed.

Next, an example of a method for mirror-finishing a titanium spoon based on the above-mentioned processing principle will be explained with reference to FIGS. 5 and 6.

In Fig. 5, (Ill is an electrode connected to the negative electrode of a DC power source, l121 is an abrasive material such as an insulating and water-permeable nonwoven fabric coated with or impregnated with abrasive grains,
), an abrasive material Q21 is adhered to form an electrode tool (13). a41 is the titanium material connected to the positive electrode of the DC power supply, (15) is the machining liquid (1!) formed on the electrode (l!)
161, the electrode tool 09 is pressed against the titanium material, and the machining fluid [161
21 to the titanium material tl-41, and the electrode tool αJ is moved in one direction or reciprocatingly to perform processing.

Next, in FIG. 6, a'r+1 is the base of a conductive rotating disk type electrode tool whose lower end is expanded into a dish shape, (1,[
! 1 is a supply path for machining fluid (19) formed in the base θη,
Cap 1 is a disk electrode attached to the lower end surface of the base and connected to the negative electrode of a DC power source, Wa 1) is a plurality of outlet ports for machining fluid (19) provided through the electrode, and (B) is It is an insulating and water-permeable abrasive material attached to the lower surface of the electrode, that is, the surface of the rigid tool, and is composed of a nonwoven fabric or the like coated with or impregnated with abrasive grains. (Foundation) is a titanium material connected to the positive electrode of a DC power source), the electrode tool is pressed against the titanium material), and the machining fluid ([9) is passed from the supply path (181 to the outlet gn).

The abrasive material flows through the titanium material and is processed by moving the electrode tool while rotating it.

Finally, the experimental results will be explained together with Section 7 (2).

In the same figure, line A is the surface machining liquid of this invention.

BiW is the case when a water-based machining fluid is used, and C line is when water is used.As is clear from the figure, the roughness of the machined surface is different from that of the machining fluid according to the present invention even when using abrasive grains of the same particle size. When used, it is the smallest, and it is possible to finish the chita wood to a mirror finish.

[Brief explanation of the drawing]

Figure 1 is a diagram of the processing principle, Figures 2 and 3 are diagrams each explaining the state of the protective film, Figure 4 is the processing principle, and Figures 5 and 6 are the electrodes used in this invention, respectively. The front view and partially cut-away front view of the tool, and Figure 7 are diagrams showing the relationship between abrasive grain size and machined surface roughness. 12)...Titanium material, (3)...Abrasive grain, (6)...
・Electrolyte solution. Agent Patent Attorney Fuji 1) Ryutabeki・Figure 2Figure 3Figure 1Figure 4Figure 5Figure 6Figure 7□Ishi t! , Hiro Kiriyashi

Claims (1)

[Claims] ■In the mirror polishing solution used in the electrolytic composite rust surface processing method that combines electrolytic action and abrasive abrasion action to mirror finish titanium, tan and their alloys, oleic acid or A mirror finishing liquid characterized by adding a fatty acid surfactant such as lauric acid, linoleic acid, or stearic acid.